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f6e9a3ee | 1 | ## Copyright (C) 1996-2019 The Squid Software Foundation and contributors |
5d28d44b AJ |
2 | ## |
3 | ## Squid software is distributed under GPLv2+ license and includes | |
4 | ## contributions from numerous individuals and organizations. | |
5 | ## Please see the COPYING and CONTRIBUTORS files for details. | |
6 | ## | |
9cef6668 | 7 | |
0f74202c | 8 | COMMENT_START |
ad12fb4b | 9 | WELCOME TO @SQUID@ |
cccac0a2 | 10 | ---------------------------- |
5945964d AJ |
11 | |
12 | This is the documentation for the Squid configuration file. | |
13 | This documentation can also be found online at: | |
14 | http://www.squid-cache.org/Doc/config/ | |
15 | ||
16 | You may wish to look at the Squid home page and wiki for the | |
17 | FAQ and other documentation: | |
18 | http://www.squid-cache.org/ | |
19 | http://wiki.squid-cache.org/SquidFaq | |
20 | http://wiki.squid-cache.org/ConfigExamples | |
21 | ||
22 | This documentation shows what the defaults for various directives | |
23 | happen to be. If you don't need to change the default, you should | |
24 | leave the line out of your squid.conf in most cases. | |
25 | ||
26 | In some cases "none" refers to no default setting at all, | |
27 | while in other cases it refers to the value of the option | |
28 | - the comments for that keyword indicate if this is the case. | |
debd9a31 | 29 | |
cccac0a2 | 30 | COMMENT_END |
3a278cb8 | 31 | |
592a09dc | 32 | COMMENT_START |
33 | Configuration options can be included using the "include" directive. | |
5945964d | 34 | Include takes a list of files to include. Quoting and wildcards are |
592a09dc | 35 | supported. |
36 | ||
37 | For example, | |
38 | ||
39 | include /path/to/included/file/squid.acl.config | |
40 | ||
41 | Includes can be nested up to a hard-coded depth of 16 levels. | |
42 | This arbitrary restriction is to prevent recursive include references | |
43 | from causing Squid entering an infinite loop whilst trying to load | |
44 | configuration files. | |
d4a3e179 | 45 | |
a345387f AJ |
46 | Values with byte units |
47 | ||
a01a87d9 AJ |
48 | Squid accepts size units on some size related directives. All |
49 | such directives are documented with a default value displaying | |
50 | a unit. | |
a345387f AJ |
51 | |
52 | Units accepted by Squid are: | |
a01a87d9 AJ |
53 | bytes - byte |
54 | KB - Kilobyte (1024 bytes) | |
a345387f AJ |
55 | MB - Megabyte |
56 | GB - Gigabyte | |
d4a3e179 | 57 | |
2eceb328 CT |
58 | Values with spaces, quotes, and other special characters |
59 | ||
60 | Squid supports directive parameters with spaces, quotes, and other | |
61 | special characters. Surround such parameters with "double quotes". Use | |
62 | the configuration_includes_quoted_values directive to enable or | |
63 | disable that support. | |
64 | ||
65 | Squid supports reading configuration option parameters from external | |
66 | files using the syntax: | |
67 | parameters("/path/filename") | |
68 | For example: | |
69 | acl whitelist dstdomain parameters("/etc/squid/whitelist.txt") | |
70 | ||
5735d30b AR |
71 | Conditional configuration |
72 | ||
73 | If-statements can be used to make configuration directives | |
74 | depend on conditions: | |
75 | ||
76 | if <CONDITION> | |
77 | ... regular configuration directives ... | |
78 | [else | |
79 | ... regular configuration directives ...] | |
80 | endif | |
81 | ||
82 | The else part is optional. The keywords "if", "else", and "endif" | |
83 | must be typed on their own lines, as if they were regular | |
84 | configuration directives. | |
85 | ||
5945964d AJ |
86 | NOTE: An else-if condition is not supported. |
87 | ||
5735d30b AR |
88 | These individual conditions types are supported: |
89 | ||
90 | true | |
91 | Always evaluates to true. | |
92 | false | |
93 | Always evaluates to false. | |
94 | <integer> = <integer> | |
95 | Equality comparison of two integer numbers. | |
96 | ||
97 | ||
d4a3e179 AR |
98 | SMP-Related Macros |
99 | ||
100 | The following SMP-related preprocessor macros can be used. | |
101 | ||
102 | ${process_name} expands to the current Squid process "name" | |
103 | (e.g., squid1, squid2, or cache1). | |
104 | ||
105 | ${process_number} expands to the current Squid process | |
106 | identifier, which is an integer number (e.g., 1, 2, 3) unique | |
6fe8c876 AJ |
107 | across all Squid processes of the current service instance. |
108 | ||
109 | ${service_name} expands into the current Squid service instance | |
110 | name identifier which is provided by -n on the command line. | |
111 | ||
cde8f31b NH |
112 | Logformat Macros |
113 | ||
114 | Logformat macros can be used in many places outside of the logformat | |
115 | directive. In theory, all of the logformat codes can be used as %macros, | |
116 | where they are supported. In practice, a %macro expands as a dash (-) when | |
117 | the transaction does not yet have enough information and a value is needed. | |
118 | ||
119 | There is no definitive list of what tokens are available at the various | |
120 | stages of the transaction. | |
121 | ||
122 | And some information may already be available to Squid but not yet | |
123 | committed where the macro expansion code can access it (report | |
124 | such instances!). The macro will be expanded into a single dash | |
125 | ('-') in such cases. Not all macros have been tested. | |
126 | ||
592a09dc | 127 | COMMENT_END |
128 | ||
25234ebd AJ |
129 | # options still not yet ported from 2.7 to 3.x |
130 | NAME: broken_vary_encoding | |
131 | TYPE: obsolete | |
132 | DOC_START | |
133 | This option is not yet supported by Squid-3. | |
134 | DOC_END | |
135 | ||
136 | NAME: cache_vary | |
137 | TYPE: obsolete | |
138 | DOC_START | |
139 | This option is not yet supported by Squid-3. | |
140 | DOC_END | |
141 | ||
25234ebd AJ |
142 | NAME: error_map |
143 | TYPE: obsolete | |
144 | DOC_START | |
145 | This option is not yet supported by Squid-3. | |
146 | DOC_END | |
147 | ||
148 | NAME: external_refresh_check | |
149 | TYPE: obsolete | |
150 | DOC_START | |
151 | This option is not yet supported by Squid-3. | |
152 | DOC_END | |
153 | ||
96598f93 | 154 | NAME: location_rewrite_program location_rewrite_access location_rewrite_children location_rewrite_concurrency |
25234ebd AJ |
155 | TYPE: obsolete |
156 | DOC_START | |
157 | This option is not yet supported by Squid-3. | |
158 | DOC_END | |
159 | ||
96598f93 | 160 | NAME: refresh_stale_hit |
25234ebd AJ |
161 | TYPE: obsolete |
162 | DOC_START | |
163 | This option is not yet supported by Squid-3. | |
164 | DOC_END | |
165 | ||
6eb545bc | 166 | # Options removed in 4.x |
f1a5d071 AJ |
167 | NAME: cache_peer_domain cache_host_domain |
168 | TYPE: obsolete | |
169 | DOC_START | |
170 | Replace with dstdomain ACLs and cache_peer_access. | |
171 | DOC_END | |
172 | ||
6eb545bc AJ |
173 | NAME: ie_refresh |
174 | TYPE: obsolete | |
175 | DOC_START | |
176 | Remove this line. The behaviour enabled by this is no longer needed. | |
177 | DOC_END | |
178 | ||
7e62a74f AJ |
179 | NAME: sslproxy_cafile |
180 | TYPE: obsolete | |
181 | DOC_START | |
182 | Remove this line. Use tls_outgoing_options cafile= instead. | |
183 | DOC_END | |
184 | ||
185 | NAME: sslproxy_capath | |
186 | TYPE: obsolete | |
187 | DOC_START | |
188 | Remove this line. Use tls_outgoing_options capath= instead. | |
189 | DOC_END | |
190 | ||
191 | NAME: sslproxy_cipher | |
192 | TYPE: obsolete | |
193 | DOC_START | |
194 | Remove this line. Use tls_outgoing_options cipher= instead. | |
195 | DOC_END | |
196 | ||
197 | NAME: sslproxy_client_certificate | |
198 | TYPE: obsolete | |
199 | DOC_START | |
200 | Remove this line. Use tls_outgoing_options cert= instead. | |
201 | DOC_END | |
202 | ||
203 | NAME: sslproxy_client_key | |
204 | TYPE: obsolete | |
205 | DOC_START | |
206 | Remove this line. Use tls_outgoing_options key= instead. | |
207 | DOC_END | |
208 | ||
209 | NAME: sslproxy_flags | |
210 | TYPE: obsolete | |
211 | DOC_START | |
212 | Remove this line. Use tls_outgoing_options flags= instead. | |
213 | DOC_END | |
214 | ||
215 | NAME: sslproxy_options | |
216 | TYPE: obsolete | |
217 | DOC_START | |
218 | Remove this line. Use tls_outgoing_options options= instead. | |
219 | DOC_END | |
220 | ||
221 | NAME: sslproxy_version | |
222 | TYPE: obsolete | |
223 | DOC_START | |
1cc44095 | 224 | Remove this line. Use tls_outgoing_options options= instead. |
7e62a74f AJ |
225 | DOC_END |
226 | ||
9967aef6 AJ |
227 | # Options removed in 3.5 |
228 | NAME: hierarchy_stoplist | |
229 | TYPE: obsolete | |
230 | DOC_START | |
231 | Remove this line. Use always_direct or cache_peer_access ACLs instead if you need to prevent cache_peer use. | |
232 | DOC_END | |
233 | ||
a8f70484 | 234 | # Options removed in 3.4 |
74d81220 AJ |
235 | NAME: log_access |
236 | TYPE: obsolete | |
237 | DOC_START | |
238 | Remove this line. Use acls with access_log directives to control access logging | |
239 | DOC_END | |
240 | ||
241 | NAME: log_icap | |
242 | TYPE: obsolete | |
243 | DOC_START | |
244 | Remove this line. Use acls with icap_log directives to control icap logging | |
245 | DOC_END | |
246 | ||
96598f93 AJ |
247 | # Options Removed in 3.3 |
248 | NAME: ignore_ims_on_miss | |
25234ebd AJ |
249 | TYPE: obsolete |
250 | DOC_START | |
2d4eefd9 | 251 | Remove this line. The HTTP/1.1 feature is now configured by 'cache_miss_revalidate'. |
25234ebd AJ |
252 | DOC_END |
253 | ||
76f44481 | 254 | # Options Removed in 3.2 |
635c1614 AJ |
255 | NAME: balance_on_multiple_ip |
256 | TYPE: obsolete | |
257 | DOC_START | |
258 | Remove this line. Squid performs a 'Happy Eyeballs' algorithm, this multiple-IP algorithm is not longer relevant. | |
259 | DOC_END | |
260 | ||
16cd62b7 AJ |
261 | NAME: chunked_request_body_max_size |
262 | TYPE: obsolete | |
263 | DOC_START | |
264 | Remove this line. Squid is now HTTP/1.1 compliant. | |
265 | DOC_END | |
266 | ||
74d81220 | 267 | NAME: dns_v4_fallback |
76f44481 AJ |
268 | TYPE: obsolete |
269 | DOC_START | |
74d81220 | 270 | Remove this line. Squid performs a 'Happy Eyeballs' algorithm, the 'fallback' algorithm is no longer relevant. |
76f44481 AJ |
271 | DOC_END |
272 | ||
74d81220 | 273 | NAME: emulate_httpd_log |
6e095b46 AJ |
274 | TYPE: obsolete |
275 | DOC_START | |
74d81220 AJ |
276 | Replace this with an access_log directive using the format 'common' or 'combined'. |
277 | DOC_END | |
278 | ||
279 | NAME: forward_log | |
280 | TYPE: obsolete | |
281 | DOC_START | |
282 | Use a regular access.log with ACL limiting it to MISS events. | |
6e095b46 AJ |
283 | DOC_END |
284 | ||
76f44481 AJ |
285 | NAME: ftp_list_width |
286 | TYPE: obsolete | |
287 | DOC_START | |
288 | Remove this line. Configure FTP page display using the CSS controls in errorpages.css instead. | |
289 | DOC_END | |
290 | ||
74d81220 AJ |
291 | NAME: ignore_expect_100 |
292 | TYPE: obsolete | |
293 | DOC_START | |
294 | Remove this line. The HTTP/1.1 feature is now fully supported by default. | |
295 | DOC_END | |
296 | ||
297 | NAME: log_fqdn | |
298 | TYPE: obsolete | |
299 | DOC_START | |
300 | Remove this option from your config. To log FQDN use %>A in the log format. | |
301 | DOC_END | |
302 | ||
303 | NAME: log_ip_on_direct | |
304 | TYPE: obsolete | |
305 | DOC_START | |
306 | Remove this option from your config. To log server or peer names use %<A in the log format. | |
307 | DOC_END | |
308 | ||
38493d67 AJ |
309 | NAME: maximum_single_addr_tries |
310 | TYPE: obsolete | |
311 | DOC_START | |
312 | Replaced by connect_retries. The behaviour has changed, please read the documentation before altering. | |
313 | DOC_END | |
314 | ||
74d81220 AJ |
315 | NAME: referer_log referrer_log |
316 | TYPE: obsolete | |
317 | DOC_START | |
318 | Replace this with an access_log directive using the format 'referrer'. | |
319 | DOC_END | |
320 | ||
4ded749e AJ |
321 | NAME: update_headers |
322 | TYPE: obsolete | |
323 | DOC_START | |
324 | Remove this line. The feature is supported by default in storage types where update is implemented. | |
325 | DOC_END | |
326 | ||
76f44481 AJ |
327 | NAME: url_rewrite_concurrency |
328 | TYPE: obsolete | |
329 | DOC_START | |
330 | Remove this line. Set the 'concurrency=' option of url_rewrite_children instead. | |
331 | DOC_END | |
332 | ||
74d81220 AJ |
333 | NAME: useragent_log |
334 | TYPE: obsolete | |
335 | DOC_START | |
336 | Replace this with an access_log directive using the format 'useragent'. | |
337 | DOC_END | |
338 | ||
76f44481 AJ |
339 | # Options Removed in 3.1 |
340 | NAME: dns_testnames | |
341 | TYPE: obsolete | |
342 | DOC_START | |
343 | Remove this line. DNS is no longer tested on startup. | |
344 | DOC_END | |
345 | ||
346 | NAME: extension_methods | |
347 | TYPE: obsolete | |
348 | DOC_START | |
349 | Remove this line. All valid methods for HTTP are accepted by default. | |
350 | DOC_END | |
351 | ||
c72a2049 AJ |
352 | # 2.7 Options Removed/Replaced in 3.2 |
353 | NAME: zero_buffers | |
354 | TYPE: obsolete | |
355 | DOC_NONE | |
356 | ||
76f44481 AJ |
357 | # 2.7 Options Removed/Replaced in 3.1 |
358 | NAME: incoming_rate | |
359 | TYPE: obsolete | |
360 | DOC_NONE | |
361 | ||
362 | NAME: server_http11 | |
363 | TYPE: obsolete | |
364 | DOC_START | |
365 | Remove this line. HTTP/1.1 is supported by default. | |
366 | DOC_END | |
367 | ||
368 | NAME: upgrade_http0.9 | |
369 | TYPE: obsolete | |
370 | DOC_START | |
371 | Remove this line. ICY/1.0 streaming protocol is supported by default. | |
372 | DOC_END | |
373 | ||
374 | NAME: zph_local zph_mode zph_option zph_parent zph_sibling | |
375 | TYPE: obsolete | |
376 | DOC_START | |
377 | Alter these entries. Use the qos_flows directive instead. | |
378 | DOC_END | |
379 | ||
380 | # Options Removed in 3.0 | |
381 | NAME: header_access | |
382 | TYPE: obsolete | |
383 | DOC_START | |
384 | Since squid-3.0 replace with request_header_access or reply_header_access | |
385 | depending on whether you wish to match client requests or server replies. | |
386 | DOC_END | |
387 | ||
388 | NAME: httpd_accel_no_pmtu_disc | |
389 | TYPE: obsolete | |
390 | DOC_START | |
391 | Since squid-3.0 use the 'disable-pmtu-discovery' flag on http_port instead. | |
392 | DOC_END | |
393 | ||
3b31a711 AJ |
394 | NAME: wais_relay_host |
395 | TYPE: obsolete | |
396 | DOC_START | |
397 | Replace this line with 'cache_peer' configuration. | |
398 | DOC_END | |
399 | ||
400 | NAME: wais_relay_port | |
401 | TYPE: obsolete | |
402 | DOC_START | |
403 | Replace this line with 'cache_peer' configuration. | |
404 | DOC_END | |
405 | ||
50ff42a2 AJ |
406 | COMMENT_START |
407 | OPTIONS FOR SMP | |
408 | ----------------------------------------------------------------------------- | |
409 | COMMENT_END | |
410 | ||
411 | NAME: workers | |
412 | TYPE: int | |
413 | LOC: Config.workers | |
414 | DEFAULT: 1 | |
415 | DEFAULT_DOC: SMP support disabled. | |
416 | DOC_START | |
417 | Number of main Squid processes or "workers" to fork and maintain. | |
418 | 0: "no daemon" mode, like running "squid -N ..." | |
419 | 1: "no SMP" mode, start one main Squid process daemon (default) | |
420 | N: start N main Squid process daemons (i.e., SMP mode) | |
421 | ||
422 | In SMP mode, each worker does nearly all what a single Squid daemon | |
423 | does (e.g., listen on http_port and forward HTTP requests). | |
424 | DOC_END | |
425 | ||
426 | NAME: cpu_affinity_map | |
427 | TYPE: CpuAffinityMap | |
428 | LOC: Config.cpuAffinityMap | |
429 | DEFAULT: none | |
430 | DEFAULT_DOC: Let operating system decide. | |
431 | DOC_START | |
432 | Usage: cpu_affinity_map process_numbers=P1,P2,... cores=C1,C2,... | |
433 | ||
434 | Sets 1:1 mapping between Squid processes and CPU cores. For example, | |
435 | ||
436 | cpu_affinity_map process_numbers=1,2,3,4 cores=1,3,5,7 | |
437 | ||
438 | affects processes 1 through 4 only and places them on the first | |
439 | four even cores, starting with core #1. | |
440 | ||
441 | CPU cores are numbered starting from 1. Requires support for | |
442 | sched_getaffinity(2) and sched_setaffinity(2) system calls. | |
443 | ||
444 | Multiple cpu_affinity_map options are merged. | |
445 | ||
446 | See also: workers | |
447 | DOC_END | |
448 | ||
c756d517 AR |
449 | NAME: shared_memory_locking |
450 | TYPE: YesNoNone | |
451 | COMMENT: on|off | |
452 | LOC: Config.shmLocking | |
453 | DEFAULT: off | |
454 | DOC_START | |
455 | Whether to ensure that all required shared memory is available by | |
456 | "locking" that shared memory into RAM when Squid starts. The | |
457 | alternative is faster startup time followed by slightly slower | |
458 | performance and, if not enough RAM is actually available during | |
459 | runtime, mysterious crashes. | |
460 | ||
461 | SMP Squid uses many shared memory segments. These segments are | |
462 | brought into Squid memory space using an mmap(2) system call. During | |
463 | Squid startup, the mmap() call often succeeds regardless of whether | |
464 | the system has enough RAM. In general, Squid cannot tell whether the | |
465 | kernel applies this "optimistic" memory allocation policy (but | |
466 | popular modern kernels usually use it). | |
467 | ||
468 | Later, if Squid attempts to actually access the mapped memory | |
469 | regions beyond what the kernel is willing to allocate, the | |
470 | "optimistic" kernel simply kills Squid kid with a SIGBUS signal. | |
471 | Some of the memory limits enforced by the kernel are currently | |
472 | poorly understood: We do not know how to detect and check them. This | |
473 | option ensures that the mapped memory will be available. | |
474 | ||
475 | This option may have a positive performance side-effect: Locking | |
476 | memory at start avoids runtime paging I/O. Paging slows Squid down. | |
477 | ||
478 | Locking memory may require a large enough RLIMIT_MEMLOCK OS limit, | |
479 | CAP_IPC_LOCK capability, or equivalent. | |
480 | DOC_END | |
481 | ||
00e2479d AR |
482 | NAME: hopeless_kid_revival_delay |
483 | COMMENT: time-units | |
484 | TYPE: time_t | |
485 | LOC: Config.hopelessKidRevivalDelay | |
486 | DEFAULT: 1 hour | |
487 | DOC_START | |
488 | Normally, when a kid process dies, Squid immediately restarts the | |
489 | kid. A kid experiencing frequent deaths is marked as "hopeless" for | |
490 | the duration specified by this directive. Hopeless kids are not | |
491 | automatically restarted. | |
492 | ||
493 | Currently, zero values are not supported because they result in | |
494 | misconfigured SMP Squid instances running forever, endlessly | |
495 | restarting each dying kid. To effectively disable hopeless kids | |
496 | revival, set the delay to a huge value (e.g., 1 year). | |
497 | ||
498 | Reconfiguration also clears all hopeless kids designations, allowing | |
499 | for manual revival of hopeless kids. | |
500 | DOC_END | |
501 | ||
5473c134 | 502 | COMMENT_START |
41bd17a4 | 503 | OPTIONS FOR AUTHENTICATION |
5473c134 | 504 | ----------------------------------------------------------------------------- |
505 | COMMENT_END | |
506 | ||
41bd17a4 | 507 | NAME: auth_param |
508 | TYPE: authparam | |
2f1431ea | 509 | IFDEF: USE_AUTH |
5c112575 | 510 | LOC: Auth::TheConfig.schemes |
cccac0a2 | 511 | DEFAULT: none |
512 | DOC_START | |
41bd17a4 | 513 | This is used to define parameters for the various authentication |
514 | schemes supported by Squid. | |
cccac0a2 | 515 | |
66c583dc | 516 | format: auth_param scheme parameter [setting] |
cccac0a2 | 517 | |
41bd17a4 | 518 | The order in which authentication schemes are presented to the client is |
519 | dependent on the order the scheme first appears in config file. IE | |
520 | has a bug (it's not RFC 2617 compliant) in that it will use the basic | |
521 | scheme if basic is the first entry presented, even if more secure | |
522 | schemes are presented. For now use the order in the recommended | |
523 | settings section below. If other browsers have difficulties (don't | |
524 | recognize the schemes offered even if you are using basic) either | |
525 | put basic first, or disable the other schemes (by commenting out their | |
526 | program entry). | |
cccac0a2 | 527 | |
41bd17a4 | 528 | Once an authentication scheme is fully configured, it can only be |
529 | shutdown by shutting squid down and restarting. Changes can be made on | |
530 | the fly and activated with a reconfigure. I.E. You can change to a | |
531 | different helper, but not unconfigure the helper completely. | |
cccac0a2 | 532 | |
41bd17a4 | 533 | Please note that while this directive defines how Squid processes |
534 | authentication it does not automatically activate authentication. | |
535 | To use authentication you must in addition make use of ACLs based | |
536 | on login name in http_access (proxy_auth, proxy_auth_regex or | |
537 | external with %LOGIN used in the format tag). The browser will be | |
538 | challenged for authentication on the first such acl encountered | |
539 | in http_access processing and will also be re-challenged for new | |
540 | login credentials if the request is being denied by a proxy_auth | |
541 | type acl. | |
cccac0a2 | 542 | |
41bd17a4 | 543 | WARNING: authentication can't be used in a transparently intercepting |
544 | proxy as the client then thinks it is talking to an origin server and | |
545 | not the proxy. This is a limitation of bending the TCP/IP protocol to | |
546 | transparently intercepting port 80, not a limitation in Squid. | |
b3567eb5 FC |
547 | Ports flagged 'transparent', 'intercept', or 'tproxy' have |
548 | authentication disabled. | |
cccac0a2 | 549 | |
d4806c91 CT |
550 | === Parameters common to all schemes. === |
551 | ||
552 | "program" cmdline | |
66c583dc | 553 | Specifies the command for the external authenticator. |
d4806c91 | 554 | |
66c583dc AJ |
555 | By default, each authentication scheme is not used unless a |
556 | program is specified. | |
cccac0a2 | 557 | |
66c583dc AJ |
558 | See http://wiki.squid-cache.org/Features/AddonHelpers for |
559 | more details on helper operations and creating your own. | |
5269ec0e | 560 | |
66c583dc AJ |
561 | "key_extras" format |
562 | Specifies a string to be append to request line format for | |
563 | the authentication helper. "Quoted" format values may contain | |
564 | spaces and logformat %macros. In theory, any logformat %macro | |
565 | can be used. In practice, a %macro expands as a dash (-) if | |
566 | the helper request is sent before the required macro | |
567 | information is available to Squid. | |
568 | ||
569 | By default, Squid uses request formats provided in | |
570 | scheme-specific examples below (search for %credentials). | |
571 | ||
572 | The expanded key_extras value is added to the Squid credentials | |
573 | cache and, hence, will affect authentication. It can be used to | |
574 | autenticate different users with identical user names (e.g., | |
575 | when user authentication depends on http_port). | |
576 | ||
577 | Avoid adding frequently changing information to key_extras. For | |
578 | example, if you add user source IP, and it changes frequently | |
579 | in your environment, then max_user_ip ACL is going to treat | |
580 | every user+IP combination as a unique "user", breaking the ACL | |
581 | and wasting a lot of memory on those user records. It will also | |
582 | force users to authenticate from scratch whenever their IP | |
583 | changes. | |
584 | ||
585 | "realm" string | |
586 | Specifies the protection scope (aka realm name) which is to be | |
587 | reported to the client for the authentication scheme. It is | |
588 | commonly part of the text the user will see when prompted for | |
589 | their username and password. | |
590 | ||
591 | For Basic the default is "Squid proxy-caching web server". | |
592 | For Digest there is no default, this parameter is mandatory. | |
593 | For NTLM and Negotiate this parameter is ignored. | |
5269ec0e | 594 | |
6082a0e2 EB |
595 | "children" numberofchildren [startup=N] [idle=N] [concurrency=N] |
596 | [queue-size=N] [on-persistent-overload=action] | |
a56fcf0b | 597 | [reservation-timeout=seconds] |
5269ec0e | 598 | |
66c583dc AJ |
599 | The maximum number of authenticator processes to spawn. If |
600 | you start too few Squid will have to wait for them to process | |
601 | a backlog of credential verifications, slowing it down. When | |
602 | password verifications are done via a (slow) network you are | |
603 | likely to need lots of authenticator processes. | |
5269ec0e | 604 | |
66c583dc AJ |
605 | The startup= and idle= options permit some skew in the exact |
606 | amount run. A minimum of startup=N will begin during startup | |
607 | and reconfigure. Squid will start more in groups of up to | |
608 | idle=N in an attempt to meet traffic needs and to keep idle=N | |
609 | free above those traffic needs up to the maximum. | |
5269ec0e | 610 | |
66c583dc AJ |
611 | The concurrency= option sets the number of concurrent requests |
612 | the helper can process. The default of 0 is used for helpers | |
613 | who only supports one request at a time. Setting this to a | |
614 | number greater than 0 changes the protocol used to include a | |
615 | channel ID field first on the request/response line, allowing | |
616 | multiple requests to be sent to the same helper in parallel | |
617 | without waiting for the response. | |
cccac0a2 | 618 | |
66c583dc AJ |
619 | Concurrency must not be set unless it's known the helper |
620 | supports the input format with channel-ID fields. | |
cccac0a2 | 621 | |
79933cd6 AR |
622 | The queue-size option sets the maximum number of queued |
623 | requests. A request is queued when no existing child can | |
624 | accept it due to concurrency limit and no new child can be | |
625 | started due to numberofchildren limit. The default maximum is | |
626 | 2*numberofchildren. Squid is allowed to temporarily exceed the | |
627 | configured maximum, marking the affected helper as | |
628 | "overloaded". If the helper overload lasts more than 3 | |
629 | minutes, the action prescribed by the on-persistent-overload | |
630 | option applies. | |
6082a0e2 EB |
631 | |
632 | The on-persistent-overload=action option specifies Squid | |
633 | reaction to a new helper request arriving when the helper | |
634 | has been overloaded for more that 3 minutes already. The number | |
635 | of queued requests determines whether the helper is overloaded | |
636 | (see the queue-size option). | |
637 | ||
638 | Two actions are supported: | |
639 | ||
640 | die Squid worker quits. This is the default behavior. | |
641 | ||
642 | ERR Squid treats the helper request as if it was | |
643 | immediately submitted, and the helper immediately | |
644 | replied with an ERR response. This action has no effect | |
645 | on the already queued and in-progress helper requests. | |
6825b101 | 646 | |
66c583dc AJ |
647 | NOTE: NTLM and Negotiate schemes do not support concurrency |
648 | in the Squid code module even though some helpers can. | |
307b83b7 | 649 | |
a56fcf0b CT |
650 | The reservation-timeout=seconds option allows NTLM and Negotiate |
651 | helpers to forget about clients that abandon their in-progress | |
652 | connection authentication without closing the connection. The | |
653 | timeout is measured since the last helper response received by | |
654 | Squid for the client. Fractional seconds are not supported. | |
655 | ||
656 | After the timeout, the helper will be used for other clients if | |
657 | there are no unreserved helpers available. In the latter case, | |
658 | the old client attempt to resume authentication will not be | |
659 | forwarded to the helper (and the client should open a new HTTP | |
660 | connection and retry authentication from scratch). | |
661 | ||
662 | By default, reservations do not expire and clients that keep | |
663 | their connections open without completing authentication may | |
664 | exhaust all NTLM and Negotiate helpers. | |
665 | ||
b2b09838 AJ |
666 | "keep_alive" on|off |
667 | If you experience problems with PUT/POST requests when using | |
668 | the NTLM or Negotiate schemes then you can try setting this | |
669 | to off. This will cause Squid to forcibly close the connection | |
670 | on the initial request where the browser asks which schemes | |
671 | are supported by the proxy. | |
9e7dbc51 | 672 | |
b2b09838 | 673 | For Basic and Digest this parameter is ignored. |
d2a89ac1 | 674 | |
66c583dc AJ |
675 | "utf8" on|off |
676 | HTTP uses iso-latin-1 as character set, while some | |
677 | authentication backends such as LDAP expects UTF-8. If this is | |
678 | set to on Squid will translate the HTTP iso-latin-1 charset to | |
679 | UTF-8 before sending the username and password to the helper. | |
d1b63fc8 | 680 | |
b2b09838 AJ |
681 | For NTLM and Negotiate this parameter is ignored. |
682 | ||
683 | IF HAVE_AUTH_MODULE_BASIC | |
684 | === Basic authentication parameters === | |
685 | ||
41bd17a4 | 686 | "credentialsttl" timetolive |
66c583dc AJ |
687 | Specifies how long squid assumes an externally validated |
688 | username:password pair is valid for - in other words how | |
689 | often the helper program is called for that user. Set this | |
690 | low to force revalidation with short lived passwords. | |
cccac0a2 | 691 | |
66c583dc AJ |
692 | NOTE: setting this high does not impact your susceptibility |
693 | to replay attacks unless you are using an one-time password | |
694 | system (such as SecureID). If you are using such a system, | |
695 | you will be vulnerable to replay attacks unless you also | |
696 | use the max_user_ip ACL in an http_access rule. | |
cccac0a2 | 697 | |
66c583dc AJ |
698 | "casesensitive" on|off |
699 | Specifies if usernames are case sensitive. Most user databases | |
700 | are case insensitive allowing the same username to be spelled | |
701 | using both lower and upper case letters, but some are case | |
702 | sensitive. This makes a big difference for user_max_ip ACL | |
703 | processing and similar. | |
cccac0a2 | 704 | |
66c583dc AJ |
705 | ENDIF |
706 | IF HAVE_AUTH_MODULE_DIGEST | |
707 | === Digest authentication parameters === | |
cccac0a2 | 708 | |
41bd17a4 | 709 | "nonce_garbage_interval" timeinterval |
66c583dc AJ |
710 | Specifies the interval that nonces that have been issued |
711 | to client_agent's are checked for validity. | |
cccac0a2 | 712 | |
41bd17a4 | 713 | "nonce_max_duration" timeinterval |
66c583dc AJ |
714 | Specifies the maximum length of time a given nonce will be |
715 | valid for. | |
cccac0a2 | 716 | |
41bd17a4 | 717 | "nonce_max_count" number |
66c583dc AJ |
718 | Specifies the maximum number of times a given nonce can be |
719 | used. | |
cccac0a2 | 720 | |
41bd17a4 | 721 | "nonce_strictness" on|off |
66c583dc AJ |
722 | Determines if squid requires strict increment-by-1 behavior |
723 | for nonce counts, or just incrementing (off - for use when | |
724 | user agents generate nonce counts that occasionally miss 1 | |
725 | (ie, 1,2,4,6)). Default off. | |
cccac0a2 | 726 | |
41bd17a4 | 727 | "check_nonce_count" on|off |
66c583dc AJ |
728 | This directive if set to off can disable the nonce count check |
729 | completely to work around buggy digest qop implementations in | |
730 | certain mainstream browser versions. Default on to check the | |
731 | nonce count to protect from authentication replay attacks. | |
cccac0a2 | 732 | |
41bd17a4 | 733 | "post_workaround" on|off |
66c583dc AJ |
734 | This is a workaround to certain buggy browsers who send an |
735 | incorrect request digest in POST requests when reusing the | |
736 | same nonce as acquired earlier on a GET request. | |
cccac0a2 | 737 | |
66c583dc | 738 | ENDIF |
527ee50d | 739 | |
66c583dc AJ |
740 | === Example Configuration === |
741 | ||
742 | This configuration displays the recommended authentication scheme | |
743 | order from most to least secure with recommended minimum configuration | |
744 | settings for each scheme: | |
e0855596 | 745 | |
41bd17a4 | 746 | #auth_param negotiate program <uncomment and complete this line to activate> |
48d54e4d | 747 | #auth_param negotiate children 20 startup=0 idle=1 |
e0855596 | 748 | # |
66c583dc | 749 | #auth_param digest program <uncomment and complete this line to activate> |
48d54e4d | 750 | #auth_param digest children 20 startup=0 idle=1 |
41bd17a4 | 751 | #auth_param digest realm Squid proxy-caching web server |
752 | #auth_param digest nonce_garbage_interval 5 minutes | |
753 | #auth_param digest nonce_max_duration 30 minutes | |
754 | #auth_param digest nonce_max_count 50 | |
e0855596 | 755 | # |
66c583dc AJ |
756 | #auth_param ntlm program <uncomment and complete this line to activate> |
757 | #auth_param ntlm children 20 startup=0 idle=1 | |
66c583dc | 758 | # |
41bd17a4 | 759 | #auth_param basic program <uncomment and complete this line> |
6f4d3ed6 | 760 | #auth_param basic children 5 startup=5 idle=1 |
41bd17a4 | 761 | #auth_param basic credentialsttl 2 hours |
41bd17a4 | 762 | DOC_END |
cccac0a2 | 763 | |
41bd17a4 | 764 | NAME: authenticate_cache_garbage_interval |
5db226c8 | 765 | IFDEF: USE_AUTH |
41bd17a4 | 766 | TYPE: time_t |
767 | DEFAULT: 1 hour | |
00ef8d82 | 768 | LOC: Auth::TheConfig.garbageCollectInterval |
41bd17a4 | 769 | DOC_START |
770 | The time period between garbage collection across the username cache. | |
4ded749e | 771 | This is a trade-off between memory utilization (long intervals - say |
41bd17a4 | 772 | 2 days) and CPU (short intervals - say 1 minute). Only change if you |
773 | have good reason to. | |
774 | DOC_END | |
cccac0a2 | 775 | |
41bd17a4 | 776 | NAME: authenticate_ttl |
5db226c8 | 777 | IFDEF: USE_AUTH |
41bd17a4 | 778 | TYPE: time_t |
779 | DEFAULT: 1 hour | |
00ef8d82 | 780 | LOC: Auth::TheConfig.credentialsTtl |
41bd17a4 | 781 | DOC_START |
782 | The time a user & their credentials stay in the logged in | |
783 | user cache since their last request. When the garbage | |
784 | interval passes, all user credentials that have passed their | |
785 | TTL are removed from memory. | |
786 | DOC_END | |
cccac0a2 | 787 | |
41bd17a4 | 788 | NAME: authenticate_ip_ttl |
5db226c8 | 789 | IFDEF: USE_AUTH |
41bd17a4 | 790 | TYPE: time_t |
00ef8d82 | 791 | LOC: Auth::TheConfig.ipTtl |
c35dd848 | 792 | DEFAULT: 1 second |
41bd17a4 | 793 | DOC_START |
794 | If you use proxy authentication and the 'max_user_ip' ACL, | |
795 | this directive controls how long Squid remembers the IP | |
796 | addresses associated with each user. Use a small value | |
797 | (e.g., 60 seconds) if your users might change addresses | |
4ded749e | 798 | quickly, as is the case with dialup. You might be safe |
41bd17a4 | 799 | using a larger value (e.g., 2 hours) in a corporate LAN |
800 | environment with relatively static address assignments. | |
801 | DOC_END | |
cccac0a2 | 802 | |
3d1e3e43 | 803 | COMMENT_START |
804 | ACCESS CONTROLS | |
805 | ----------------------------------------------------------------------------- | |
806 | COMMENT_END | |
807 | ||
41bd17a4 | 808 | NAME: external_acl_type |
809 | TYPE: externalAclHelper | |
810 | LOC: Config.externalAclHelperList | |
cccac0a2 | 811 | DEFAULT: none |
cccac0a2 | 812 | DOC_START |
41bd17a4 | 813 | This option defines external acl classes using a helper program |
814 | to look up the status | |
cccac0a2 | 815 | |
262eaf9a | 816 | external_acl_type name [options] FORMAT /path/to/helper [helper arguments] |
cccac0a2 | 817 | |
41bd17a4 | 818 | Options: |
cccac0a2 | 819 | |
41bd17a4 | 820 | ttl=n TTL in seconds for cached results (defaults to 3600 |
cd0fd8a9 | 821 | for 1 hour) |
4f8d0a65 | 822 | |
41bd17a4 | 823 | negative_ttl=n |
cd0fd8a9 AJ |
824 | TTL for cached negative lookups (default same |
825 | as ttl) | |
4f8d0a65 AJ |
826 | |
827 | grace=n Percentage remaining of TTL where a refresh of a | |
828 | cached entry should be initiated without needing to | |
829 | wait for a new reply. (default is for no grace period) | |
830 | ||
eef8bf2d AR |
831 | cache=n The maximum number of entries in the result cache. The |
832 | default limit is 262144 entries. Each cache entry usually | |
833 | consumes at least 256 bytes. Squid currently does not remove | |
834 | expired cache entries until the limit is reached, so a proxy | |
835 | will sooner or later reach the limit. The expanded FORMAT | |
836 | value is used as the cache key, so if the details in FORMAT | |
837 | are highly variable, a larger cache may be needed to produce | |
838 | reduction in helper load. | |
4f8d0a65 | 839 | |
48d54e4d AJ |
840 | children-max=n |
841 | Maximum number of acl helper processes spawned to service | |
2ccfb9a7 | 842 | external acl lookups of this type. (default 5) |
4f8d0a65 | 843 | |
48d54e4d AJ |
844 | children-startup=n |
845 | Minimum number of acl helper processes to spawn during | |
846 | startup and reconfigure to service external acl lookups | |
847 | of this type. (default 0) | |
4f8d0a65 | 848 | |
48d54e4d AJ |
849 | children-idle=n |
850 | Number of acl helper processes to keep ahead of traffic | |
851 | loads. Squid will spawn this many at once whenever load | |
852 | rises above the capabilities of existing processes. | |
853 | Up to the value of children-max. (default 1) | |
4f8d0a65 | 854 | |
41bd17a4 | 855 | concurrency=n concurrency level per process. Only used with helpers |
856 | capable of processing more than one query at a time. | |
4f8d0a65 | 857 | |
79933cd6 AR |
858 | queue-size=N The queue-size option sets the maximum number of |
859 | queued requests. A request is queued when no existing | |
860 | helper can accept it due to concurrency limit and no | |
861 | new helper can be started due to children-max limit. | |
862 | If the queued requests exceed queue size, the acl is | |
863 | ignored. The default value is set to 2*children-max. | |
4f8d0a65 AJ |
864 | |
865 | protocol=2.5 Compatibility mode for Squid-2.5 external acl helpers. | |
866 | ||
91e64de9 AJ |
867 | ipv4 / ipv6 IP protocol used to communicate with this helper. |
868 | The default is to auto-detect IPv6 and use it when available. | |
cccac0a2 | 869 | |
4f8d0a65 | 870 | |
cd0fd8a9 AJ |
871 | FORMAT is a series of %macro codes. See logformat directive for a full list |
872 | of the accepted codes. Although note that at the time of any external ACL | |
873 | being tested data may not be available and thus some %macro expand to '-'. | |
874 | ||
875 | In addition to the logformat codes; when processing external ACLs these | |
876 | additional macros are made available: | |
7b0ca1e8 | 877 | |
ec2d5242 | 878 | %ACL The name of the ACL being tested. |
ec2d5242 | 879 | |
0638f4a2 AJ |
880 | %DATA The ACL arguments specified in the referencing config |
881 | 'acl ... external' line, separated by spaces (an | |
882 | "argument string"). see acl external. | |
883 | ||
884 | If there are no ACL arguments %DATA expands to '-'. | |
885 | ||
886 | If you do not specify a DATA macro inside FORMAT, | |
887 | Squid automatically appends %DATA to your FORMAT. | |
2fb65892 AJ |
888 | Note that Squid-3.x may expand %DATA to whitespace |
889 | or nothing in this case. | |
cd0fd8a9 | 890 | |
262eaf9a CT |
891 | By default, Squid applies URL-encoding to each ACL |
892 | argument inside the argument string. If an explicit | |
893 | encoding modifier is used (e.g., %#DATA), then Squid | |
894 | encodes the whole argument string as a single token | |
895 | (e.g., with %#DATA, spaces between arguments become | |
896 | %20). | |
897 | ||
cd0fd8a9 AJ |
898 | If SSL is enabled, the following formating codes become available: |
899 | ||
900 | %USER_CERT SSL User certificate in PEM format | |
901 | %USER_CERTCHAIN SSL User certificate chain in PEM format | |
902 | %USER_CERT_xx SSL User certificate subject attribute xx | |
903 | %USER_CA_CERT_xx SSL User certificate issuer attribute xx | |
904 | ||
905 | ||
906 | NOTE: all other format codes accepted by older Squid versions | |
907 | are deprecated. | |
0db8942f | 908 | |
cccac0a2 | 909 | |
5269ec0e AJ |
910 | General request syntax: |
911 | ||
0638f4a2 | 912 | [channel-ID] FORMAT-values |
5269ec0e AJ |
913 | |
914 | ||
915 | FORMAT-values consists of transaction details expanded with | |
916 | whitespace separation per the config file FORMAT specification | |
917 | using the FORMAT macros listed above. | |
918 | ||
5269ec0e AJ |
919 | Request values sent to the helper are URL escaped to protect |
920 | each value in requests against whitespaces. | |
921 | ||
922 | If using protocol=2.5 then the request sent to the helper is not | |
923 | URL escaped to protect against whitespace. | |
924 | ||
925 | NOTE: protocol=3.0 is deprecated as no longer necessary. | |
926 | ||
927 | When using the concurrency= option the protocol is changed by | |
928 | introducing a query channel tag in front of the request/response. | |
929 | The query channel tag is a number between 0 and concurrency-1. | |
930 | This value must be echoed back unchanged to Squid as the first part | |
931 | of the response relating to its request. | |
932 | ||
933 | ||
934 | The helper receives lines expanded per the above format specification | |
935 | and for each input line returns 1 line starting with OK/ERR/BH result | |
936 | code and optionally followed by additional keywords with more details. | |
937 | ||
cccac0a2 | 938 | |
41bd17a4 | 939 | General result syntax: |
cccac0a2 | 940 | |
5269ec0e AJ |
941 | [channel-ID] result keyword=value ... |
942 | ||
943 | Result consists of one of the codes: | |
944 | ||
945 | OK | |
946 | the ACL test produced a match. | |
947 | ||
948 | ERR | |
949 | the ACL test does not produce a match. | |
950 | ||
951 | BH | |
4ded749e | 952 | An internal error occurred in the helper, preventing |
5269ec0e AJ |
953 | a result being identified. |
954 | ||
955 | The meaning of 'a match' is determined by your squid.conf | |
956 | access control configuration. See the Squid wiki for details. | |
cccac0a2 | 957 | |
41bd17a4 | 958 | Defined keywords: |
cccac0a2 | 959 | |
41bd17a4 | 960 | user= The users name (login) |
5269ec0e | 961 | |
41bd17a4 | 962 | password= The users password (for login= cache_peer option) |
5269ec0e | 963 | |
05e52854 | 964 | message= Message describing the reason for this response. |
5269ec0e AJ |
965 | Available as %o in error pages. |
966 | Useful on (ERR and BH results). | |
967 | ||
05e52854 AJ |
968 | tag= Apply a tag to a request. Only sets a tag once, |
969 | does not alter existing tags. | |
5269ec0e | 970 | |
41bd17a4 | 971 | log= String to be logged in access.log. Available as |
cd0fd8a9 | 972 | %ea in logformat specifications. |
934b03fc | 973 | |
cd0fd8a9 | 974 | clt_conn_tag= Associates a TAG with the client TCP connection. |
4f8d0a65 AJ |
975 | Please see url_rewrite_program related documentation |
976 | for this kv-pair. | |
457857fe | 977 | |
05e52854 | 978 | Any keywords may be sent on any response whether OK, ERR or BH. |
6a566b9c | 979 | |
05e52854 AJ |
980 | All response keyword values need to be a single token with URL |
981 | escaping, or enclosed in double quotes (") and escaped using \ on | |
24eac830 AJ |
982 | any double quotes or \ characters within the value. The wrapping |
983 | double quotes are removed before the value is interpreted by Squid. | |
984 | \r and \n are also replace by CR and LF. | |
1e5562e3 | 985 | |
24eac830 AJ |
986 | Some example key values: |
987 | ||
5269ec0e | 988 | user=John%20Smith |
24eac830 AJ |
989 | user="John Smith" |
990 | user="J. \"Bob\" Smith" | |
cccac0a2 | 991 | DOC_END |
992 | ||
41bd17a4 | 993 | NAME: acl |
994 | TYPE: acl | |
995 | LOC: Config.aclList | |
cb4f4424 | 996 | IF USE_OPENSSL |
cf1c09f6 CT |
997 | DEFAULT: ssl::certHasExpired ssl_error X509_V_ERR_CERT_HAS_EXPIRED |
998 | DEFAULT: ssl::certNotYetValid ssl_error X509_V_ERR_CERT_NOT_YET_VALID | |
999 | DEFAULT: ssl::certDomainMismatch ssl_error SQUID_X509_V_ERR_DOMAIN_MISMATCH | |
1000 | DEFAULT: ssl::certUntrusted ssl_error X509_V_ERR_INVALID_CA X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY X509_V_ERR_CERT_UNTRUSTED | |
1001 | DEFAULT: ssl::certSelfSigned ssl_error X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT | |
1002 | ENDIF | |
1f5bd0a4 | 1003 | DEFAULT: all src all |
b8a25eaa AJ |
1004 | DEFAULT: manager url_regex -i ^cache_object:// +i ^https?://[^/]+/squid-internal-mgr/ |
1005 | DEFAULT: localhost src 127.0.0.1/32 ::1 | |
1006 | DEFAULT: to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1 | |
2c56ee3c | 1007 | DEFAULT: CONNECT method CONNECT |
29503899 | 1008 | DEFAULT_DOC: ACLs all, manager, localhost, to_localhost, and CONNECT are predefined. |
cccac0a2 | 1009 | DOC_START |
41bd17a4 | 1010 | Defining an Access List |
cccac0a2 | 1011 | |
375eeb3b AJ |
1012 | Every access list definition must begin with an aclname and acltype, |
1013 | followed by either type-specific arguments or a quoted filename that | |
1014 | they are read from. | |
cccac0a2 | 1015 | |
375eeb3b AJ |
1016 | acl aclname acltype argument ... |
1017 | acl aclname acltype "file" ... | |
cccac0a2 | 1018 | |
375eeb3b | 1019 | When using "file", the file should contain one item per line. |
cccac0a2 | 1020 | |
76ee67ac CT |
1021 | |
1022 | ACL Options | |
1023 | ||
1024 | Some acl types supports options which changes their default behaviour: | |
0f987978 CT |
1025 | |
1026 | -i,+i By default, regular expressions are CASE-SENSITIVE. To make them | |
1027 | case-insensitive, use the -i option. To return case-sensitive | |
1028 | use the +i option between patterns, or make a new ACL line | |
1029 | without -i. | |
1030 | ||
1031 | -n Disable lookups and address type conversions. If lookup or | |
1032 | conversion is required because the parameter type (IP or | |
1033 | domain name) does not match the message address type (domain | |
1034 | name or IP), then the ACL would immediately declare a mismatch | |
1035 | without any warnings or lookups. | |
1036 | ||
76ee67ac CT |
1037 | -m[=delimiters] |
1038 | Perform a list membership test, interpreting values as | |
1039 | comma-separated token lists and matching against individual | |
1040 | tokens instead of whole values. | |
1041 | The optional "delimiters" parameter specifies one or more | |
1042 | alternative non-alphanumeric delimiter characters. | |
1043 | non-alphanumeric delimiter characters. | |
1044 | ||
0f987978 CT |
1045 | -- Used to stop processing all options, in the case the first acl |
1046 | value has '-' character as first character (for example the '-' | |
1047 | is a valid domain name) | |
cccac0a2 | 1048 | |
b3567eb5 FC |
1049 | Some acl types require suspending the current request in order |
1050 | to access some external data source. | |
1051 | Those which do are marked with the tag [slow], those which | |
1052 | don't are marked as [fast]. | |
1053 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl | |
1054 | for further information | |
e988aa40 AJ |
1055 | |
1056 | ***** ACL TYPES AVAILABLE ***** | |
1057 | ||
1e40905d AJ |
1058 | acl aclname src ip-address/mask ... # clients IP address [fast] |
1059 | acl aclname src addr1-addr2/mask ... # range of addresses [fast] | |
0f987978 | 1060 | acl aclname dst [-n] ip-address/mask ... # URL host's IP address [slow] |
1e40905d | 1061 | acl aclname localip ip-address/mask ... # IP address the client connected to [fast] |
cccac0a2 | 1062 | |
a85f0df5 AJ |
1063 | if USE_SQUID_EUI |
1064 | acl aclname arp mac-address ... | |
1065 | acl aclname eui64 eui64-address ... | |
b3567eb5 | 1066 | # [fast] |
a85f0df5 AJ |
1067 | # MAC (EUI-48) and EUI-64 addresses use xx:xx:xx:xx:xx:xx notation. |
1068 | # | |
abe01913 AJ |
1069 | # The 'arp' ACL code is not portable to all operating systems. |
1070 | # It works on Linux, Solaris, Windows, FreeBSD, and some other | |
1071 | # BSD variants. | |
41bd17a4 | 1072 | # |
a85f0df5 AJ |
1073 | # The eui_lookup directive is required to be 'on' (the default) |
1074 | # and Squid built with --enable-eui for MAC/EUI addresses to be | |
1075 | # available for this ACL. | |
1076 | # | |
1077 | # Squid can only determine the MAC/EUI address for IPv4 | |
abe01913 AJ |
1078 | # clients that are on the same subnet. If the client is on a |
1079 | # different subnet, then Squid cannot find out its address. | |
1080 | # | |
a85f0df5 | 1081 | # IPv6 protocol does not contain ARP. MAC/EUI is either |
abe01913 | 1082 | # encoded directly in the IPv6 address or not available. |
a85f0df5 | 1083 | endif |
653d9927 | 1084 | acl aclname clientside_mark mark[/mask] ... |
244da4ad AG |
1085 | # matches CONNMARK of an accepted connection [fast] |
1086 | # DEPRECATED. Use the 'client_connection_mark' instead. | |
1087 | ||
1088 | acl aclname client_connection_mark mark[/mask] ... | |
653d9927 A |
1089 | # matches CONNMARK of an accepted connection [fast] |
1090 | # | |
1091 | # mark and mask are unsigned integers (hex, octal, or decimal). | |
1092 | # If multiple marks are given, then the ACL matches if at least | |
1093 | # one mark matches. | |
1094 | # | |
1095 | # Uses netfilter-conntrack library. | |
1096 | # Requires building Squid with --enable-linux-netfilter. | |
1097 | # | |
1098 | # The client, various intermediaries, and Squid itself may set | |
1099 | # CONNMARK at various times. The last CONNMARK set wins. This ACL | |
1100 | # checks the mark present on an accepted connection or set by | |
1101 | # Squid afterwards, depending on the ACL check timing. This ACL | |
1102 | # effectively ignores any mark set by other agents after Squid has | |
1103 | # accepted the connection. | |
1104 | ||
b3567eb5 FC |
1105 | acl aclname srcdomain .foo.com ... |
1106 | # reverse lookup, from client IP [slow] | |
0f987978 | 1107 | acl aclname dstdomain [-n] .foo.com ... |
e38c7724 | 1108 | # Destination server from URL [fast] |
b3567eb5 FC |
1109 | acl aclname srcdom_regex [-i] \.foo\.com ... |
1110 | # regex matching client name [slow] | |
0f987978 | 1111 | acl aclname dstdom_regex [-n] [-i] \.foo\.com ... |
e38c7724 | 1112 | # regex matching server [fast] |
b3567eb5 | 1113 | # |
41bd17a4 | 1114 | # For dstdomain and dstdom_regex a reverse lookup is tried if a IP |
1115 | # based URL is used and no match is found. The name "none" is used | |
1116 | # if the reverse lookup fails. | |
9bc73deb | 1117 | |
375eeb3b AJ |
1118 | acl aclname src_as number ... |
1119 | acl aclname dst_as number ... | |
b3567eb5 | 1120 | # [fast] |
e988aa40 AJ |
1121 | # Except for access control, AS numbers can be used for |
1122 | # routing of requests to specific caches. Here's an | |
1123 | # example for routing all requests for AS#1241 and only | |
1124 | # those to mycache.mydomain.net: | |
1125 | # acl asexample dst_as 1241 | |
1126 | # cache_peer_access mycache.mydomain.net allow asexample | |
1127 | # cache_peer_access mycache_mydomain.net deny all | |
7f7db318 | 1128 | |
6db78a1a | 1129 | acl aclname peername myPeer ... |
a85f0df5 | 1130 | acl aclname peername_regex [-i] regex-pattern ... |
b3567eb5 | 1131 | # [fast] |
6db78a1a AJ |
1132 | # match against a named cache_peer entry |
1133 | # set unique name= on cache_peer lines for reliable use. | |
1134 | ||
375eeb3b | 1135 | acl aclname time [day-abbrevs] [h1:m1-h2:m2] |
b3567eb5 | 1136 | # [fast] |
375eeb3b AJ |
1137 | # day-abbrevs: |
1138 | # S - Sunday | |
1139 | # M - Monday | |
1140 | # T - Tuesday | |
1141 | # W - Wednesday | |
1142 | # H - Thursday | |
1143 | # F - Friday | |
1144 | # A - Saturday | |
1145 | # h1:m1 must be less than h2:m2 | |
1146 | ||
b3567eb5 FC |
1147 | acl aclname url_regex [-i] ^http:// ... |
1148 | # regex matching on whole URL [fast] | |
9d35fe37 AJ |
1149 | acl aclname urllogin [-i] [^a-zA-Z0-9] ... |
1150 | # regex matching on URL login field | |
b3567eb5 FC |
1151 | acl aclname urlpath_regex [-i] \.gif$ ... |
1152 | # regex matching on URL path [fast] | |
e988aa40 | 1153 | |
b3567eb5 FC |
1154 | acl aclname port 80 70 21 0-1024... # destination TCP port [fast] |
1155 | # ranges are alloed | |
1e40905d AJ |
1156 | acl aclname localport 3128 ... # TCP port the client connected to [fast] |
1157 | # NP: for interception mode this is usually '80' | |
1158 | ||
3cc0f4e7 | 1159 | acl aclname myportname 3128 ... # *_port name [fast] |
e988aa40 | 1160 | |
b3567eb5 FC |
1161 | acl aclname proto HTTP FTP ... # request protocol [fast] |
1162 | ||
1163 | acl aclname method GET POST ... # HTTP request method [fast] | |
e988aa40 | 1164 | |
b3567eb5 FC |
1165 | acl aclname http_status 200 301 500- 400-403 ... |
1166 | # status code in reply [fast] | |
e988aa40 | 1167 | |
375eeb3b | 1168 | acl aclname browser [-i] regexp ... |
b3567eb5 | 1169 | # pattern match on User-Agent header (see also req_header below) [fast] |
e988aa40 | 1170 | |
375eeb3b | 1171 | acl aclname referer_regex [-i] regexp ... |
b3567eb5 | 1172 | # pattern match on Referer header [fast] |
41bd17a4 | 1173 | # Referer is highly unreliable, so use with care |
e988aa40 | 1174 | |
d4c6acac | 1175 | acl aclname ident [-i] username ... |
41bd17a4 | 1176 | acl aclname ident_regex [-i] pattern ... |
b3567eb5 | 1177 | # string match on ident output [slow] |
41bd17a4 | 1178 | # use REQUIRED to accept any non-null ident. |
cf5cc17e | 1179 | |
41bd17a4 | 1180 | acl aclname proxy_auth [-i] username ... |
1181 | acl aclname proxy_auth_regex [-i] pattern ... | |
b3567eb5 FC |
1182 | # perform http authentication challenge to the client and match against |
1183 | # supplied credentials [slow] | |
1184 | # | |
1185 | # takes a list of allowed usernames. | |
41bd17a4 | 1186 | # use REQUIRED to accept any valid username. |
1187 | # | |
b3567eb5 FC |
1188 | # Will use proxy authentication in forward-proxy scenarios, and plain |
1189 | # http authenticaiton in reverse-proxy scenarios | |
1190 | # | |
41bd17a4 | 1191 | # NOTE: when a Proxy-Authentication header is sent but it is not |
1192 | # needed during ACL checking the username is NOT logged | |
1193 | # in access.log. | |
1194 | # | |
1195 | # NOTE: proxy_auth requires a EXTERNAL authentication program | |
1196 | # to check username/password combinations (see | |
1197 | # auth_param directive). | |
1198 | # | |
e988aa40 AJ |
1199 | # NOTE: proxy_auth can't be used in a transparent/intercepting proxy |
1200 | # as the browser needs to be configured for using a proxy in order | |
41bd17a4 | 1201 | # to respond to proxy authentication. |
8e8d4f30 | 1202 | |
41bd17a4 | 1203 | acl aclname snmp_community string ... |
b3567eb5 | 1204 | # A community string to limit access to your SNMP Agent [fast] |
41bd17a4 | 1205 | # Example: |
1206 | # | |
1207 | # acl snmppublic snmp_community public | |
934b03fc | 1208 | |
41bd17a4 | 1209 | acl aclname maxconn number |
1210 | # This will be matched when the client's IP address has | |
55d0fae8 AJ |
1211 | # more than <number> TCP connections established. [fast] |
1212 | # NOTE: This only measures direct TCP links so X-Forwarded-For | |
1213 | # indirect clients are not counted. | |
1e5562e3 | 1214 | |
41bd17a4 | 1215 | acl aclname max_user_ip [-s] number |
1216 | # This will be matched when the user attempts to log in from more | |
1217 | # than <number> different ip addresses. The authenticate_ip_ttl | |
b3567eb5 | 1218 | # parameter controls the timeout on the ip entries. [fast] |
41bd17a4 | 1219 | # If -s is specified the limit is strict, denying browsing |
1220 | # from any further IP addresses until the ttl has expired. Without | |
1221 | # -s Squid will just annoy the user by "randomly" denying requests. | |
1222 | # (the counter is reset each time the limit is reached and a | |
1223 | # request is denied) | |
1224 | # NOTE: in acceleration mode or where there is mesh of child proxies, | |
1225 | # clients may appear to come from multiple addresses if they are | |
1226 | # going through proxy farms, so a limit of 1 may cause user problems. | |
cccac0a2 | 1227 | |
cb1b906f AJ |
1228 | acl aclname random probability |
1229 | # Pseudo-randomly match requests. Based on the probability given. | |
1230 | # Probability may be written as a decimal (0.333), fraction (1/3) | |
1231 | # or ratio of matches:non-matches (3:5). | |
1232 | ||
375eeb3b | 1233 | acl aclname req_mime_type [-i] mime-type ... |
41bd17a4 | 1234 | # regex match against the mime type of the request generated |
1235 | # by the client. Can be used to detect file upload or some | |
b3567eb5 | 1236 | # types HTTP tunneling requests [fast] |
41bd17a4 | 1237 | # NOTE: This does NOT match the reply. You cannot use this |
1238 | # to match the returned file type. | |
cccac0a2 | 1239 | |
41bd17a4 | 1240 | acl aclname req_header header-name [-i] any\.regex\.here |
1241 | # regex match against any of the known request headers. May be | |
1242 | # thought of as a superset of "browser", "referer" and "mime-type" | |
b3567eb5 | 1243 | # ACL [fast] |
cccac0a2 | 1244 | |
375eeb3b | 1245 | acl aclname rep_mime_type [-i] mime-type ... |
41bd17a4 | 1246 | # regex match against the mime type of the reply received by |
1247 | # squid. Can be used to detect file download or some | |
b3567eb5 | 1248 | # types HTTP tunneling requests. [fast] |
41bd17a4 | 1249 | # NOTE: This has no effect in http_access rules. It only has |
1250 | # effect in rules that affect the reply data stream such as | |
1251 | # http_reply_access. | |
cccac0a2 | 1252 | |
41bd17a4 | 1253 | acl aclname rep_header header-name [-i] any\.regex\.here |
1254 | # regex match against any of the known reply headers. May be | |
1255 | # thought of as a superset of "browser", "referer" and "mime-type" | |
b3567eb5 | 1256 | # ACLs [fast] |
cccac0a2 | 1257 | |
375eeb3b | 1258 | acl aclname external class_name [arguments...] |
41bd17a4 | 1259 | # external ACL lookup via a helper class defined by the |
b3567eb5 | 1260 | # external_acl_type directive [slow] |
cccac0a2 | 1261 | |
41bd17a4 | 1262 | acl aclname user_cert attribute values... |
1263 | # match against attributes in a user SSL certificate | |
2927ae41 | 1264 | # attribute is one of DN/C/O/CN/L/ST or a numerical OID [fast] |
cccac0a2 | 1265 | |
41bd17a4 | 1266 | acl aclname ca_cert attribute values... |
1267 | # match against attributes a users issuing CA SSL certificate | |
2927ae41 | 1268 | # attribute is one of DN/C/O/CN/L/ST or a numerical OID [fast] |
cccac0a2 | 1269 | |
d4c6acac | 1270 | acl aclname ext_user [-i] username ... |
41bd17a4 | 1271 | acl aclname ext_user_regex [-i] pattern ... |
b3567eb5 | 1272 | # string match on username returned by external acl helper [slow] |
41bd17a4 | 1273 | # use REQUIRED to accept any non-null user name. |
b3567eb5 | 1274 | |
0ab50441 | 1275 | acl aclname tag tagvalue ... |
94da12c8 AJ |
1276 | # string match on tag returned by external acl helper [fast] |
1277 | # DEPRECATED. Only the first tag will match with this ACL. | |
1278 | # Use the 'note' ACL instead for handling multiple tag values. | |
cccac0a2 | 1279 | |
bbaf2685 AJ |
1280 | acl aclname hier_code codename ... |
1281 | # string match against squid hierarchy code(s); [fast] | |
1282 | # e.g., DIRECT, PARENT_HIT, NONE, etc. | |
1283 | # | |
1284 | # NOTE: This has no effect in http_access rules. It only has | |
1285 | # effect in rules that affect the reply data stream such as | |
1286 | # http_reply_access. | |
1287 | ||
76ee67ac | 1288 | acl aclname note [-m[=delimiters]] name [value ...] |
39baccc8 CT |
1289 | # match transaction annotation [fast] |
1290 | # Without values, matches any annotation with a given name. | |
1291 | # With value(s), matches any annotation with a given name that | |
1292 | # also has one of the given values. | |
76ee67ac CT |
1293 | # If the -m flag is used, then the value of the named |
1294 | # annotation is interpreted as a list of tokens, and the ACL | |
1295 | # matches individual name=token pairs rather than whole | |
1296 | # name=value pairs. See "ACL Options" above for more info. | |
39baccc8 CT |
1297 | # Annotation sources include note and adaptation_meta directives |
1298 | # as well as helper and eCAP responses. | |
1299 | ||
589aab05 CT |
1300 | acl aclname annotate_transaction [-m[=delimiters]] key=value ... |
1301 | acl aclname annotate_transaction [-m[=delimiters]] key+=value ... | |
75d47340 CT |
1302 | # Always matches. [fast] |
1303 | # Used for its side effect: This ACL immediately adds a | |
1304 | # key=value annotation to the current master transaction. | |
1305 | # The added annotation can then be tested using note ACL and | |
1306 | # logged (or sent to helpers) using %note format code. | |
1307 | # | |
1308 | # Annotations can be specified using replacement and addition | |
1309 | # formats. The key=value form replaces old same-key annotation | |
1310 | # value(s). The key+=value form appends a new value to the old | |
1311 | # same-key annotation. Both forms create a new key=value | |
1312 | # annotation if no same-key annotation exists already. If | |
1313 | # -m flag is used, then the value is interpreted as a list | |
1314 | # and the annotation will contain key=token pair(s) instead of the | |
1315 | # whole key=value pair. | |
1316 | # | |
1317 | # This ACL is especially useful for recording complex multi-step | |
1318 | # ACL-driven decisions. For example, the following configuration | |
1319 | # avoids logging transactions accepted after aclX matched: | |
1320 | # | |
1321 | # # First, mark transactions accepted after aclX matched | |
1322 | # acl markSpecial annotate_transaction special=true | |
1323 | # http_access allow acl001 | |
1324 | # ... | |
1325 | # http_access deny acl100 | |
1326 | # http_access allow aclX markSpecial | |
1327 | # | |
1328 | # # Second, do not log marked transactions: | |
1329 | # acl markedSpecial note special true | |
1330 | # access_log ... deny markedSpecial | |
1331 | # | |
1332 | # # Note that the following would not have worked because aclX | |
1333 | # # alone does not determine whether the transaction was allowed: | |
1334 | # access_log ... deny aclX # Wrong! | |
1335 | # | |
1336 | # Warning: This ACL annotates the transaction even when negated | |
1337 | # and even if subsequent ACLs fail to match. For example, the | |
1338 | # following three rules will have exactly the same effect as far | |
1339 | # as annotations set by the "mark" ACL are concerned: | |
1340 | # | |
1341 | # some_directive acl1 ... mark # rule matches if mark is reached | |
1342 | # some_directive acl1 ... !mark # rule never matches | |
1343 | # some_directive acl1 ... mark !all # rule never matches | |
1344 | ||
589aab05 CT |
1345 | acl aclname annotate_client [-m[=delimiters]] key=value ... |
1346 | acl aclname annotate_client [-m[=delimiters]] key+=value ... | |
75d47340 | 1347 | # |
589aab05 CT |
1348 | # Always matches. [fast] |
1349 | # Used for its side effect: This ACL immediately adds a | |
1350 | # key=value annotation to the current client-to-Squid | |
75d47340 CT |
1351 | # connection. Connection annotations are propagated to the current |
1352 | # and all future master transactions on the annotated connection. | |
1353 | # See the annotate_transaction ACL for details. | |
1354 | # | |
1355 | # For example, the following configuration avoids rewriting URLs | |
1356 | # of transactions bumped by SslBump: | |
1357 | # | |
1358 | # # First, mark bumped connections: | |
1359 | # acl markBumped annotate_client bumped=true | |
1360 | # ssl_bump peek acl1 | |
1361 | # ssl_bump stare acl2 | |
1362 | # ssl_bump bump acl3 markBumped | |
1363 | # ssl_bump splice all | |
1364 | # | |
1365 | # # Second, do not send marked transactions to the redirector: | |
1366 | # acl markedBumped note bumped true | |
1367 | # url_rewrite_access deny markedBumped | |
1368 | # | |
1369 | # # Note that the following would not have worked because acl3 alone | |
1370 | # # does not determine whether the connection is going to be bumped: | |
1371 | # url_rewrite_access deny acl3 # Wrong! | |
1372 | ||
c302ddb5 CT |
1373 | acl aclname adaptation_service service ... |
1374 | # Matches the name of any icap_service, ecap_service, | |
1375 | # adaptation_service_set, or adaptation_service_chain that Squid | |
1376 | # has used (or attempted to use) for the master transaction. | |
1377 | # This ACL must be defined after the corresponding adaptation | |
1378 | # service is named in squid.conf. This ACL is usable with | |
1379 | # adaptation_meta because it starts matching immediately after | |
1380 | # the service has been selected for adaptation. | |
1381 | ||
5ceaee75 CT |
1382 | acl aclname transaction_initiator initiator ... |
1383 | # Matches transaction's initiator [fast] | |
1384 | # | |
1385 | # Supported initiators are: | |
1386 | # esi: matches transactions fetching ESI resources | |
1387 | # certificate-fetching: matches transactions fetching | |
1388 | # a missing intermediate TLS certificate | |
1389 | # cache-digest: matches transactions fetching Cache Digests | |
1390 | # from a cache_peer | |
1391 | # htcp: matches HTCP requests from peers | |
1392 | # icp: matches ICP requests to peers | |
1393 | # icmp: matches ICMP RTT database (NetDB) requests to peers | |
1394 | # asn: matches asns db requests | |
1395 | # internal: matches any of the above | |
1396 | # client: matches transactions containing an HTTP or FTP | |
1397 | # client request received at a Squid *_port | |
1398 | # all: matches any transaction, including internal transactions | |
1399 | # without a configurable initiator and hopefully rare | |
1400 | # transactions without a known-to-Squid initiator | |
1401 | # | |
1402 | # Multiple initiators are ORed. | |
1403 | ||
5ec4cffe EB |
1404 | acl aclname has component |
1405 | # matches a transaction "component" [fast] | |
1406 | # | |
1407 | # Supported transaction components are: | |
1408 | # request: transaction has a request header (at least) | |
1409 | # response: transaction has a response header (at least) | |
1410 | # ALE: transaction has an internally-generated Access Log Entry | |
1411 | # structure; bugs notwithstanding, all transaction have it | |
1412 | # | |
1413 | # For example, the following configuration helps when dealing with HTTP | |
1414 | # clients that close connections without sending a request header: | |
1415 | # | |
1416 | # acl hasRequest has request | |
1417 | # acl logMe note important_transaction | |
1418 | # # avoid "logMe ACL is used in context without an HTTP request" warnings | |
1419 | # access_log ... logformat=detailed hasRequest logMe | |
1420 | # # log request-less transactions, instead of ignoring them | |
1421 | # access_log ... logformat=brief !hasRequest | |
1422 | # | |
1423 | # Multiple components are not supported for one "acl" rule, but | |
1424 | # can be specified (and are ORed) using multiple same-name rules: | |
1425 | # | |
1426 | # # OK, this strange logging daemon needs request or response, | |
1427 | # # but can work without either a request or a response: | |
1428 | # acl hasWhatMyLoggingDaemonNeeds has request | |
1429 | # acl hasWhatMyLoggingDaemonNeeds has response | |
1430 | ||
cb4f4424 | 1431 | IF USE_OPENSSL |
cf1c09f6 CT |
1432 | acl aclname ssl_error errorname |
1433 | # match against SSL certificate validation error [fast] | |
cf1c09f6 | 1434 | # |
7a957a93 AR |
1435 | # For valid error names see in @DEFAULT_ERROR_DIR@/templates/error-details.txt |
1436 | # template file. | |
cf1c09f6 | 1437 | # |
7a957a93 AR |
1438 | # The following can be used as shortcuts for certificate properties: |
1439 | # [ssl::]certHasExpired: the "not after" field is in the past | |
1440 | # [ssl::]certNotYetValid: the "not before" field is in the future | |
1441 | # [ssl::]certUntrusted: The certificate issuer is not to be trusted. | |
1442 | # [ssl::]certSelfSigned: The certificate is self signed. | |
1443 | # [ssl::]certDomainMismatch: The certificate CN domain does not | |
1444 | # match the name the name of the host we are connecting to. | |
1445 | # | |
1446 | # The ssl::certHasExpired, ssl::certNotYetValid, ssl::certDomainMismatch, | |
1447 | # ssl::certUntrusted, and ssl::certSelfSigned can also be used as | |
1448 | # predefined ACLs, just like the 'all' ACL. | |
1449 | # | |
1450 | # NOTE: The ssl_error ACL is only supported with sslproxy_cert_error, | |
1451 | # sslproxy_cert_sign, and sslproxy_cert_adapt options. | |
00352183 | 1452 | |
72b12f9e | 1453 | acl aclname server_cert_fingerprint [-sha1] fingerprint |
00352183 AR |
1454 | # match against server SSL certificate fingerprint [fast] |
1455 | # | |
1456 | # The fingerprint is the digest of the DER encoded version | |
1457 | # of the whole certificate. The user should use the form: XX:XX:... | |
1458 | # Optional argument specifies the digest algorithm to use. | |
1459 | # The SHA1 digest algorithm is the default and is currently | |
1460 | # the only algorithm supported (-sha1). | |
5d65362c | 1461 | |
652fcffd | 1462 | acl aclname at_step step |
8f165829 AR |
1463 | # match against the current step during ssl_bump evaluation [fast] |
1464 | # Never matches and should not be used outside the ssl_bump context. | |
1465 | # | |
1466 | # At each SslBump step, Squid evaluates ssl_bump directives to find | |
1467 | # the next bumping action (e.g., peek or splice). Valid SslBump step | |
1468 | # values and the corresponding ssl_bump evaluation moments are: | |
1110989a CT |
1469 | # SslBump1: After getting TCP-level and HTTP CONNECT info. |
1470 | # SslBump2: After getting SSL Client Hello info. | |
1471 | # SslBump3: After getting SSL Server Hello info. | |
69f69080 | 1472 | |
4f6990ec | 1473 | acl aclname ssl::server_name [option] .foo.com ... |
69f69080 CT |
1474 | # matches server name obtained from various sources [fast] |
1475 | # | |
4f6990ec CT |
1476 | # The ACL computes server name(s) using such information sources as |
1477 | # CONNECT request URI, TLS client SNI, and TLS server certificate | |
1478 | # subject (CN and SubjectAltName). The computed server name(s) usually | |
1479 | # change with each SslBump step, as more info becomes available: | |
1480 | # * SNI is used as the server name instead of the request URI, | |
1481 | # * subject name(s) from the server certificate (CN and | |
1482 | # SubjectAltName) are used as the server names instead of SNI. | |
1483 | # | |
1484 | # When the ACL computes multiple server names, matching any single | |
1485 | # computed name is sufficient for the ACL to match. | |
1486 | # | |
1487 | # The "none" name can be used to match transactions where the ACL | |
8d9e6d7f | 1488 | # could not compute the server name using any information source |
4f6990ec CT |
1489 | # that was both available and allowed to be used by the ACL options at |
1490 | # the ACL evaluation time. | |
1491 | # | |
1492 | # Unlike dstdomain, this ACL does not perform DNS lookups. | |
1493 | # | |
1494 | # An ACL option below may be used to restrict what information | |
1495 | # sources are used to extract the server names from: | |
1496 | # | |
1497 | # --client-requested | |
1498 | # The server name is SNI regardless of what the server says. | |
1499 | # --server-provided | |
1500 | # The server name(s) are the certificate subject name(s), regardless | |
1501 | # of what the client has requested. If the server certificate is | |
1502 | # unavailable, then the name is "none". | |
1503 | # --consensus | |
1504 | # The server name is either SNI (if SNI matches at least one of the | |
1505 | # certificate subject names) or "none" (otherwise). When the server | |
1506 | # certificate is unavailable, the consensus server name is SNI. | |
1507 | # | |
1508 | # Combining multiple options in one ACL is a fatal configuration | |
1509 | # error. | |
1510 | # | |
1511 | # For all options: If no SNI is available, then the CONNECT request | |
1512 | # target (a.k.a. URI) is used instead of SNI (for an intercepted | |
1513 | # connection, this target is the destination IP address). | |
69f69080 CT |
1514 | |
1515 | acl aclname ssl::server_name_regex [-i] \.foo\.com ... | |
1516 | # regex matches server name obtained from various sources [fast] | |
88df846b CT |
1517 | |
1518 | acl aclname connections_encrypted | |
1519 | # matches transactions with all HTTP messages received over TLS | |
1520 | # transport connections. [fast] | |
1521 | # | |
1522 | # The master transaction deals with HTTP messages received from | |
1523 | # various sources. All sources used by the master transaction in the | |
1524 | # past are considered by the ACL. The following rules define whether | |
1525 | # a given message source taints the entire master transaction, | |
1526 | # resulting in ACL mismatches: | |
1527 | # | |
1528 | # * The HTTP client transport connection is not TLS. | |
1529 | # * An adaptation service connection-encryption flag is off. | |
1530 | # * The peer or origin server transport connection is not TLS. | |
1531 | # | |
1532 | # Caching currently does not affect these rules. This cache ignorance | |
1533 | # implies that only the current HTTP client transport and REQMOD | |
1534 | # services status determine whether this ACL matches a from-cache | |
1535 | # transaction. The source of the cached response does not have any | |
1536 | # effect on future transaction that use the cached response without | |
1537 | # revalidation. This may change. | |
1538 | # | |
1539 | # DNS, ICP, and HTCP exchanges during the master transaction do not | |
1540 | # affect these rules. | |
cf1c09f6 | 1541 | ENDIF |
6f58d7d7 AR |
1542 | acl aclname any-of acl1 acl2 ... |
1543 | # match any one of the acls [fast or slow] | |
1544 | # The first matching ACL stops further ACL evaluation. | |
1545 | # | |
1546 | # ACLs from multiple any-of lines with the same name are ORed. | |
1547 | # For example, A = (a1 or a2) or (a3 or a4) can be written as | |
1548 | # acl A any-of a1 a2 | |
1549 | # acl A any-of a3 a4 | |
1550 | # | |
1551 | # This group ACL is fast if all evaluated ACLs in the group are fast | |
1552 | # and slow otherwise. | |
1553 | ||
1554 | acl aclname all-of acl1 acl2 ... | |
1555 | # match all of the acls [fast or slow] | |
1556 | # The first mismatching ACL stops further ACL evaluation. | |
1557 | # | |
1558 | # ACLs from multiple all-of lines with the same name are ORed. | |
1559 | # For example, B = (b1 and b2) or (b3 and b4) can be written as | |
1560 | # acl B all-of b1 b2 | |
1561 | # acl B all-of b3 b4 | |
1562 | # | |
1563 | # This group ACL is fast if all evaluated ACLs in the group are fast | |
1564 | # and slow otherwise. | |
cf1c09f6 | 1565 | |
e0855596 AJ |
1566 | Examples: |
1567 | acl macaddress arp 09:00:2b:23:45:67 | |
1568 | acl myexample dst_as 1241 | |
1569 | acl password proxy_auth REQUIRED | |
1570 | acl fileupload req_mime_type -i ^multipart/form-data$ | |
1571 | acl javascript rep_mime_type -i ^application/x-javascript$ | |
cccac0a2 | 1572 | |
41bd17a4 | 1573 | NOCOMMENT_START |
e0855596 AJ |
1574 | # |
1575 | # Recommended minimum configuration: | |
1576 | # | |
e0855596 | 1577 | |
ee776778 | 1578 | # Example rule allowing access from your local networks. |
1579 | # Adapt to list your (internal) IP networks from where browsing | |
1580 | # should be allowed | |
fe204e1d AJ |
1581 | acl localnet src 0.0.0.1-0.255.255.255 # RFC 1122 "this" network (LAN) |
1582 | acl localnet src 10.0.0.0/8 # RFC 1918 local private network (LAN) | |
1583 | acl localnet src 100.64.0.0/10 # RFC 6598 shared address space (CGN) | |
7c392424 | 1584 | acl localnet src 169.254.0.0/16 # RFC 3927 link-local (directly plugged) machines |
fe204e1d AJ |
1585 | acl localnet src 172.16.0.0/12 # RFC 1918 local private network (LAN) |
1586 | acl localnet src 192.168.0.0/16 # RFC 1918 local private network (LAN) | |
1587 | acl localnet src fc00::/7 # RFC 4193 local private network range | |
1588 | acl localnet src fe80::/10 # RFC 4291 link-local (directly plugged) machines | |
e0855596 | 1589 | |
41bd17a4 | 1590 | acl SSL_ports port 443 |
1591 | acl Safe_ports port 80 # http | |
1592 | acl Safe_ports port 21 # ftp | |
1593 | acl Safe_ports port 443 # https | |
1594 | acl Safe_ports port 70 # gopher | |
1595 | acl Safe_ports port 210 # wais | |
1596 | acl Safe_ports port 1025-65535 # unregistered ports | |
1597 | acl Safe_ports port 280 # http-mgmt | |
1598 | acl Safe_ports port 488 # gss-http | |
1599 | acl Safe_ports port 591 # filemaker | |
1600 | acl Safe_ports port 777 # multiling http | |
41bd17a4 | 1601 | NOCOMMENT_END |
1602 | DOC_END | |
cccac0a2 | 1603 | |
d3d92daa | 1604 | NAME: proxy_protocol_access |
3d674977 | 1605 | TYPE: acl_access |
d3d92daa AJ |
1606 | LOC: Config.accessList.proxyProtocol |
1607 | DEFAULT: none | |
c390580b | 1608 | DEFAULT_DOC: all TCP connections to ports with require-proxy-header will be denied |
d3d92daa AJ |
1609 | DOC_START |
1610 | Determine which client proxies can be trusted to provide correct | |
1611 | information regarding real client IP address using PROXY protocol. | |
1612 | ||
1613 | Requests may pass through a chain of several other proxies | |
1614 | before reaching us. The original source details may by sent in: | |
1615 | * HTTP message Forwarded header, or | |
1616 | * HTTP message X-Forwarded-For header, or | |
1617 | * PROXY protocol connection header. | |
1618 | ||
1619 | This directive is solely for validating new PROXY protocol | |
1620 | connections received from a port flagged with require-proxy-header. | |
1621 | It is checked only once after TCP connection setup. | |
1622 | ||
1623 | A deny match results in TCP connection closure. | |
1624 | ||
1625 | An allow match is required for Squid to permit the corresponding | |
1626 | TCP connection, before Squid even looks for HTTP request headers. | |
1627 | If there is an allow match, Squid starts using PROXY header information | |
1628 | to determine the source address of the connection for all future ACL | |
1629 | checks, logging, etc. | |
1630 | ||
1631 | SECURITY CONSIDERATIONS: | |
1632 | ||
c390580b | 1633 | Any host from which we accept client IP details can place |
d3d92daa AJ |
1634 | incorrect information in the relevant header, and Squid |
1635 | will use the incorrect information as if it were the | |
1636 | source address of the request. This may enable remote | |
1637 | hosts to bypass any access control restrictions that are | |
1638 | based on the client's source addresses. | |
1639 | ||
1640 | This clause only supports fast acl types. | |
1641 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
1642 | DOC_END | |
1643 | ||
1644 | NAME: follow_x_forwarded_for | |
1645 | TYPE: acl_access | |
1646 | IFDEF: FOLLOW_X_FORWARDED_FOR | |
3d674977 | 1647 | LOC: Config.accessList.followXFF |
3d674977 | 1648 | DEFAULT_IF_NONE: deny all |
9353df52 | 1649 | DEFAULT_DOC: X-Forwarded-For header will be ignored. |
3d674977 | 1650 | DOC_START |
00d0ce87 AJ |
1651 | Determine which client proxies can be trusted to provide correct |
1652 | information regarding real client IP address. | |
1653 | ||
3d674977 | 1654 | Requests may pass through a chain of several other proxies |
70a16fea AJ |
1655 | before reaching us. The original source details may by sent in: |
1656 | * HTTP message Forwarded header, or | |
1657 | * HTTP message X-Forwarded-For header, or | |
1658 | * PROXY protocol connection header. | |
3d674977 | 1659 | |
d3d92daa AJ |
1660 | PROXY protocol connections are controlled by the proxy_protocol_access |
1661 | directive which is checked before this. | |
1662 | ||
3d674977 | 1663 | If a request reaches us from a source that is allowed by this |
70a16fea AJ |
1664 | directive, then we trust the information it provides regarding |
1665 | the IP of the client it received from (if any). | |
1666 | ||
1667 | For the purpose of ACLs used in this directive the src ACL type always | |
1668 | matches the address we are testing and srcdomain matches its rDNS. | |
1669 | ||
70a16fea AJ |
1670 | On each HTTP request Squid checks for X-Forwarded-For header fields. |
1671 | If found the header values are iterated in reverse order and an allow | |
1672 | match is required for Squid to continue on to the next value. | |
1673 | The verification ends when a value receives a deny match, cannot be | |
1674 | tested, or there are no more values to test. | |
1675 | NOTE: Squid does not yet follow the Forwarded HTTP header. | |
3d674977 AJ |
1676 | |
1677 | The end result of this process is an IP address that we will | |
1678 | refer to as the indirect client address. This address may | |
57d76dd4 | 1679 | be treated as the client address for access control, ICAP, delay |
3d674977 | 1680 | pools and logging, depending on the acl_uses_indirect_client, |
96d64448 AJ |
1681 | icap_uses_indirect_client, delay_pool_uses_indirect_client, |
1682 | log_uses_indirect_client and tproxy_uses_indirect_client options. | |
3d674977 | 1683 | |
b3567eb5 FC |
1684 | This clause only supports fast acl types. |
1685 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
1686 | ||
3d674977 AJ |
1687 | SECURITY CONSIDERATIONS: |
1688 | ||
c390580b | 1689 | Any host from which we accept client IP details can place |
70a16fea | 1690 | incorrect information in the relevant header, and Squid |
3d674977 AJ |
1691 | will use the incorrect information as if it were the |
1692 | source address of the request. This may enable remote | |
1693 | hosts to bypass any access control restrictions that are | |
1694 | based on the client's source addresses. | |
1695 | ||
1696 | For example: | |
1697 | ||
1698 | acl localhost src 127.0.0.1 | |
1699 | acl my_other_proxy srcdomain .proxy.example.com | |
1700 | follow_x_forwarded_for allow localhost | |
1701 | follow_x_forwarded_for allow my_other_proxy | |
1702 | DOC_END | |
1703 | ||
1704 | NAME: acl_uses_indirect_client | |
1705 | COMMENT: on|off | |
1706 | TYPE: onoff | |
1707 | IFDEF: FOLLOW_X_FORWARDED_FOR | |
1708 | DEFAULT: on | |
1709 | LOC: Config.onoff.acl_uses_indirect_client | |
1710 | DOC_START | |
1711 | Controls whether the indirect client address | |
1712 | (see follow_x_forwarded_for) is used instead of the | |
1713 | direct client address in acl matching. | |
55d0fae8 AJ |
1714 | |
1715 | NOTE: maxconn ACL considers direct TCP links and indirect | |
1716 | clients will always have zero. So no match. | |
3d674977 AJ |
1717 | DOC_END |
1718 | ||
1719 | NAME: delay_pool_uses_indirect_client | |
1720 | COMMENT: on|off | |
1721 | TYPE: onoff | |
9a0a18de | 1722 | IFDEF: FOLLOW_X_FORWARDED_FOR&&USE_DELAY_POOLS |
3d674977 AJ |
1723 | DEFAULT: on |
1724 | LOC: Config.onoff.delay_pool_uses_indirect_client | |
1725 | DOC_START | |
1726 | Controls whether the indirect client address | |
1727 | (see follow_x_forwarded_for) is used instead of the | |
1728 | direct client address in delay pools. | |
1729 | DOC_END | |
1730 | ||
1731 | NAME: log_uses_indirect_client | |
1732 | COMMENT: on|off | |
1733 | TYPE: onoff | |
1734 | IFDEF: FOLLOW_X_FORWARDED_FOR | |
1735 | DEFAULT: on | |
1736 | LOC: Config.onoff.log_uses_indirect_client | |
1737 | DOC_START | |
1738 | Controls whether the indirect client address | |
1739 | (see follow_x_forwarded_for) is used instead of the | |
1740 | direct client address in the access log. | |
1741 | DOC_END | |
1742 | ||
96d64448 AJ |
1743 | NAME: tproxy_uses_indirect_client |
1744 | COMMENT: on|off | |
1745 | TYPE: onoff | |
1746 | IFDEF: FOLLOW_X_FORWARDED_FOR&&LINUX_NETFILTER | |
4d7ab5a2 | 1747 | DEFAULT: off |
96d64448 AJ |
1748 | LOC: Config.onoff.tproxy_uses_indirect_client |
1749 | DOC_START | |
1750 | Controls whether the indirect client address | |
1751 | (see follow_x_forwarded_for) is used instead of the | |
1752 | direct client address when spoofing the outgoing client. | |
4d7ab5a2 AJ |
1753 | |
1754 | This has no effect on requests arriving in non-tproxy | |
1755 | mode ports. | |
1756 | ||
1757 | SECURITY WARNING: Usage of this option is dangerous | |
1758 | and should not be used trivially. Correct configuration | |
16ae256c | 1759 | of follow_x_forwarded_for with a limited set of trusted |
4d7ab5a2 | 1760 | sources is required to prevent abuse of your proxy. |
96d64448 AJ |
1761 | DOC_END |
1762 | ||
0d901ef4 SH |
1763 | NAME: spoof_client_ip |
1764 | TYPE: acl_access | |
1765 | LOC: Config.accessList.spoof_client_ip | |
1766 | DEFAULT: none | |
1767 | DEFAULT_DOC: Allow spoofing on all TPROXY traffic. | |
1768 | DOC_START | |
1769 | Control client IP address spoofing of TPROXY traffic based on | |
1770 | defined access lists. | |
1771 | ||
1772 | spoof_client_ip allow|deny [!]aclname ... | |
1773 | ||
1774 | If there are no "spoof_client_ip" lines present, the default | |
1775 | is to "allow" spoofing of any suitable request. | |
1776 | ||
1777 | Note that the cache_peer "no-tproxy" option overrides this ACL. | |
1778 | ||
1779 | This clause supports fast acl types. | |
1780 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
1781 | DOC_END | |
1782 | ||
41bd17a4 | 1783 | NAME: http_access |
1784 | TYPE: acl_access | |
1785 | LOC: Config.accessList.http | |
41bd17a4 | 1786 | DEFAULT_IF_NONE: deny all |
638402dd | 1787 | DEFAULT_DOC: Deny, unless rules exist in squid.conf. |
41bd17a4 | 1788 | DOC_START |
1789 | Allowing or Denying access based on defined access lists | |
cccac0a2 | 1790 | |
8a2f40dd | 1791 | To allow or deny a message received on an HTTP, HTTPS, or FTP port: |
41bd17a4 | 1792 | http_access allow|deny [!]aclname ... |
cccac0a2 | 1793 | |
41bd17a4 | 1794 | NOTE on default values: |
cccac0a2 | 1795 | |
41bd17a4 | 1796 | If there are no "access" lines present, the default is to deny |
1797 | the request. | |
cccac0a2 | 1798 | |
41bd17a4 | 1799 | If none of the "access" lines cause a match, the default is the |
1800 | opposite of the last line in the list. If the last line was | |
1801 | deny, the default is allow. Conversely, if the last line | |
1802 | is allow, the default will be deny. For these reasons, it is a | |
51ae86b2 HN |
1803 | good idea to have an "deny all" entry at the end of your access |
1804 | lists to avoid potential confusion. | |
cccac0a2 | 1805 | |
b3567eb5 FC |
1806 | This clause supports both fast and slow acl types. |
1807 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
1808 | ||
41bd17a4 | 1809 | NOCOMMENT_START |
e0855596 AJ |
1810 | |
1811 | # | |
1812 | # Recommended minimum Access Permission configuration: | |
41bd17a4 | 1813 | # |
e0855596 | 1814 | # Deny requests to certain unsafe ports |
41bd17a4 | 1815 | http_access deny !Safe_ports |
e0855596 AJ |
1816 | |
1817 | # Deny CONNECT to other than secure SSL ports | |
41bd17a4 | 1818 | http_access deny CONNECT !SSL_ports |
e0855596 | 1819 | |
baa3ea7e AJ |
1820 | # Only allow cachemgr access from localhost |
1821 | http_access allow localhost manager | |
1822 | http_access deny manager | |
1823 | ||
41bd17a4 | 1824 | # We strongly recommend the following be uncommented to protect innocent |
1825 | # web applications running on the proxy server who think the only | |
1826 | # one who can access services on "localhost" is a local user | |
1827 | #http_access deny to_localhost | |
e0855596 | 1828 | |
41bd17a4 | 1829 | # |
1830 | # INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS | |
e0855596 | 1831 | # |
c8f4eac4 | 1832 | |
ee776778 | 1833 | # Example rule allowing access from your local networks. |
1834 | # Adapt localnet in the ACL section to list your (internal) IP networks | |
1835 | # from where browsing should be allowed | |
1836 | http_access allow localnet | |
afb33856 | 1837 | http_access allow localhost |
7d90757b | 1838 | |
41bd17a4 | 1839 | # And finally deny all other access to this proxy |
1840 | http_access deny all | |
1841 | NOCOMMENT_END | |
1842 | DOC_END | |
7d90757b | 1843 | |
533493da AJ |
1844 | NAME: adapted_http_access http_access2 |
1845 | TYPE: acl_access | |
1846 | LOC: Config.accessList.adapted_http | |
1847 | DEFAULT: none | |
638402dd | 1848 | DEFAULT_DOC: Allow, unless rules exist in squid.conf. |
533493da AJ |
1849 | DOC_START |
1850 | Allowing or Denying access based on defined access lists | |
1851 | ||
1852 | Essentially identical to http_access, but runs after redirectors | |
1853 | and ICAP/eCAP adaptation. Allowing access control based on their | |
1854 | output. | |
1855 | ||
1856 | If not set then only http_access is used. | |
1857 | DOC_END | |
1858 | ||
41bd17a4 | 1859 | NAME: http_reply_access |
1860 | TYPE: acl_access | |
1861 | LOC: Config.accessList.reply | |
1862 | DEFAULT: none | |
638402dd | 1863 | DEFAULT_DOC: Allow, unless rules exist in squid.conf. |
41bd17a4 | 1864 | DOC_START |
1865 | Allow replies to client requests. This is complementary to http_access. | |
cccac0a2 | 1866 | |
41bd17a4 | 1867 | http_reply_access allow|deny [!] aclname ... |
cccac0a2 | 1868 | |
41bd17a4 | 1869 | NOTE: if there are no access lines present, the default is to allow |
638402dd | 1870 | all replies. |
1a224843 | 1871 | |
41bd17a4 | 1872 | If none of the access lines cause a match the opposite of the |
1873 | last line will apply. Thus it is good practice to end the rules | |
1874 | with an "allow all" or "deny all" entry. | |
b3567eb5 FC |
1875 | |
1876 | This clause supports both fast and slow acl types. | |
1877 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
cccac0a2 | 1878 | DOC_END |
1879 | ||
41bd17a4 | 1880 | NAME: icp_access |
1881 | TYPE: acl_access | |
1882 | LOC: Config.accessList.icp | |
638402dd AJ |
1883 | DEFAULT: none |
1884 | DEFAULT_DOC: Deny, unless rules exist in squid.conf. | |
5473c134 | 1885 | DOC_START |
41bd17a4 | 1886 | Allowing or Denying access to the ICP port based on defined |
1887 | access lists | |
5473c134 | 1888 | |
41bd17a4 | 1889 | icp_access allow|deny [!]aclname ... |
5473c134 | 1890 | |
638402dd AJ |
1891 | NOTE: The default if no icp_access lines are present is to |
1892 | deny all traffic. This default may cause problems with peers | |
1893 | using ICP. | |
41bd17a4 | 1894 | |
b3567eb5 FC |
1895 | This clause only supports fast acl types. |
1896 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
e0855596 AJ |
1897 | |
1898 | # Allow ICP queries from local networks only | |
df2eec10 AJ |
1899 | #icp_access allow localnet |
1900 | #icp_access deny all | |
5473c134 | 1901 | DOC_END |
1902 | ||
41bd17a4 | 1903 | NAME: htcp_access |
1904 | IFDEF: USE_HTCP | |
1905 | TYPE: acl_access | |
1906 | LOC: Config.accessList.htcp | |
638402dd AJ |
1907 | DEFAULT: none |
1908 | DEFAULT_DOC: Deny, unless rules exist in squid.conf. | |
5473c134 | 1909 | DOC_START |
41bd17a4 | 1910 | Allowing or Denying access to the HTCP port based on defined |
1911 | access lists | |
5473c134 | 1912 | |
41bd17a4 | 1913 | htcp_access allow|deny [!]aclname ... |
5473c134 | 1914 | |
638402dd AJ |
1915 | See also htcp_clr_access for details on access control for |
1916 | cache purge (CLR) HTCP messages. | |
5473c134 | 1917 | |
0b48417e | 1918 | NOTE: The default if no htcp_access lines are present is to |
1919 | deny all traffic. This default may cause problems with peers | |
18191440 | 1920 | using the htcp option. |
0b48417e | 1921 | |
b3567eb5 FC |
1922 | This clause only supports fast acl types. |
1923 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
e0855596 AJ |
1924 | |
1925 | # Allow HTCP queries from local networks only | |
df2eec10 AJ |
1926 | #htcp_access allow localnet |
1927 | #htcp_access deny all | |
41bd17a4 | 1928 | DOC_END |
5473c134 | 1929 | |
41bd17a4 | 1930 | NAME: htcp_clr_access |
1931 | IFDEF: USE_HTCP | |
1932 | TYPE: acl_access | |
1933 | LOC: Config.accessList.htcp_clr | |
638402dd AJ |
1934 | DEFAULT: none |
1935 | DEFAULT_DOC: Deny, unless rules exist in squid.conf. | |
41bd17a4 | 1936 | DOC_START |
1937 | Allowing or Denying access to purge content using HTCP based | |
638402dd AJ |
1938 | on defined access lists. |
1939 | See htcp_access for details on general HTCP access control. | |
5473c134 | 1940 | |
41bd17a4 | 1941 | htcp_clr_access allow|deny [!]aclname ... |
5473c134 | 1942 | |
b3567eb5 FC |
1943 | This clause only supports fast acl types. |
1944 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
e0855596 AJ |
1945 | |
1946 | # Allow HTCP CLR requests from trusted peers | |
638402dd | 1947 | acl htcp_clr_peer src 192.0.2.2 2001:DB8::2 |
41bd17a4 | 1948 | htcp_clr_access allow htcp_clr_peer |
638402dd | 1949 | htcp_clr_access deny all |
5473c134 | 1950 | DOC_END |
1951 | ||
41bd17a4 | 1952 | NAME: miss_access |
1953 | TYPE: acl_access | |
1954 | LOC: Config.accessList.miss | |
b8a25eaa | 1955 | DEFAULT: none |
638402dd | 1956 | DEFAULT_DOC: Allow, unless rules exist in squid.conf. |
5473c134 | 1957 | DOC_START |
18d1eddf | 1958 | Determines whether network access is permitted when satisfying a request. |
0b4fb91a AJ |
1959 | |
1960 | For example; | |
1961 | to force your neighbors to use you as a sibling instead of | |
1962 | a parent. | |
5473c134 | 1963 | |
638402dd | 1964 | acl localclients src 192.0.2.0/24 2001:DB8::a:0/64 |
41bd17a4 | 1965 | miss_access deny !localclients |
638402dd | 1966 | miss_access allow all |
5473c134 | 1967 | |
0b4fb91a AJ |
1968 | This means only your local clients are allowed to fetch relayed/MISS |
1969 | replies from the network and all other clients can only fetch cached | |
1970 | objects (HITs). | |
1971 | ||
0b4fb91a AJ |
1972 | The default for this setting allows all clients who passed the |
1973 | http_access rules to relay via this proxy. | |
b3567eb5 FC |
1974 | |
1975 | This clause only supports fast acl types. | |
1976 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
41bd17a4 | 1977 | DOC_END |
1978 | ||
1979 | NAME: ident_lookup_access | |
1980 | TYPE: acl_access | |
1981 | IFDEF: USE_IDENT | |
638402dd AJ |
1982 | DEFAULT: none |
1983 | DEFAULT_DOC: Unless rules exist in squid.conf, IDENT is not fetched. | |
4daaf3cb | 1984 | LOC: Ident::TheConfig.identLookup |
5473c134 | 1985 | DOC_START |
41bd17a4 | 1986 | A list of ACL elements which, if matched, cause an ident |
1987 | (RFC 931) lookup to be performed for this request. For | |
1988 | example, you might choose to always perform ident lookups | |
1989 | for your main multi-user Unix boxes, but not for your Macs | |
1990 | and PCs. By default, ident lookups are not performed for | |
1991 | any requests. | |
5473c134 | 1992 | |
41bd17a4 | 1993 | To enable ident lookups for specific client addresses, you |
1994 | can follow this example: | |
5473c134 | 1995 | |
4daaf3cb | 1996 | acl ident_aware_hosts src 198.168.1.0/24 |
41bd17a4 | 1997 | ident_lookup_access allow ident_aware_hosts |
1998 | ident_lookup_access deny all | |
5473c134 | 1999 | |
4daaf3cb | 2000 | Only src type ACL checks are fully supported. A srcdomain |
41bd17a4 | 2001 | ACL might work at times, but it will not always provide |
2002 | the correct result. | |
b3567eb5 FC |
2003 | |
2004 | This clause only supports fast acl types. | |
2005 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
41bd17a4 | 2006 | DOC_END |
5473c134 | 2007 | |
5b0f5383 | 2008 | NAME: reply_body_max_size |
2009 | COMMENT: size [acl acl...] | |
2010 | TYPE: acl_b_size_t | |
2011 | DEFAULT: none | |
638402dd | 2012 | DEFAULT_DOC: No limit is applied. |
5b0f5383 | 2013 | LOC: Config.ReplyBodySize |
2014 | DOC_START | |
2015 | This option specifies the maximum size of a reply body. It can be | |
2016 | used to prevent users from downloading very large files, such as | |
2017 | MP3's and movies. When the reply headers are received, the | |
2018 | reply_body_max_size lines are processed, and the first line where | |
2019 | all (if any) listed ACLs are true is used as the maximum body size | |
2020 | for this reply. | |
2021 | ||
2022 | This size is checked twice. First when we get the reply headers, | |
2023 | we check the content-length value. If the content length value exists | |
2024 | and is larger than the allowed size, the request is denied and the | |
2025 | user receives an error message that says "the request or reply | |
2026 | is too large." If there is no content-length, and the reply | |
2027 | size exceeds this limit, the client's connection is just closed | |
2028 | and they will receive a partial reply. | |
2029 | ||
2030 | WARNING: downstream caches probably can not detect a partial reply | |
2031 | if there is no content-length header, so they will cache | |
2032 | partial responses and give them out as hits. You should NOT | |
2033 | use this option if you have downstream caches. | |
2034 | ||
2035 | WARNING: A maximum size smaller than the size of squid's error messages | |
2036 | will cause an infinite loop and crash squid. Ensure that the smallest | |
2037 | non-zero value you use is greater that the maximum header size plus | |
2038 | the size of your largest error page. | |
2039 | ||
2040 | If you set this parameter none (the default), there will be | |
2041 | no limit imposed. | |
3bc32f2f AJ |
2042 | |
2043 | Configuration Format is: | |
2044 | reply_body_max_size SIZE UNITS [acl ...] | |
2045 | ie. | |
2046 | reply_body_max_size 10 MB | |
2047 | ||
5b0f5383 | 2048 | DOC_END |
2049 | ||
3248e962 CT |
2050 | NAME: on_unsupported_protocol |
2051 | TYPE: on_unsupported_protocol | |
2052 | LOC: Config.accessList.on_unsupported_protocol | |
2053 | DEFAULT: none | |
2054 | DEFAULT_DOC: Respond with an error message to unidentifiable traffic | |
2055 | DOC_START | |
2056 | Determines Squid behavior when encountering strange requests at the | |
56d089f3 CT |
2057 | beginning of an accepted TCP connection or the beginning of a bumped |
2058 | CONNECT tunnel. Controlling Squid reaction to unexpected traffic is | |
2059 | especially useful in interception environments where Squid is likely | |
2060 | to see connections for unsupported protocols that Squid should either | |
2061 | terminate or tunnel at TCP level. | |
3248e962 CT |
2062 | |
2063 | on_unsupported_protocol <action> [!]acl ... | |
2064 | ||
56d089f3 | 2065 | The first matching action wins. Only fast ACLs are supported. |
3248e962 CT |
2066 | |
2067 | Supported actions are: | |
2068 | ||
2069 | tunnel: Establish a TCP connection with the intended server and | |
2070 | blindly shovel TCP packets between the client and server. | |
2071 | ||
2072 | respond: Respond with an error message, using the transfer protocol | |
2073 | for the Squid port that received the request (e.g., HTTP | |
2074 | for connections intercepted at the http_port). This is the | |
2075 | default. | |
56d089f3 CT |
2076 | |
2077 | Squid expects the following traffic patterns: | |
2078 | ||
2079 | http_port: a plain HTTP request | |
2080 | https_port: SSL/TLS handshake followed by an [encrypted] HTTP request | |
2081 | ftp_port: a plain FTP command (no on_unsupported_protocol support yet!) | |
2082 | CONNECT tunnel on http_port: same as https_port | |
2083 | CONNECT tunnel on https_port: same as https_port | |
2084 | ||
9155253a | 2085 | Currently, this directive has effect on intercepted connections and |
56d089f3 CT |
2086 | bumped tunnels only. Other cases are not supported because Squid |
2087 | cannot know the intended destination of other traffic. | |
3248e962 CT |
2088 | |
2089 | For example: | |
2090 | # define what Squid errors indicate receiving non-HTTP traffic: | |
2091 | acl foreignProtocol squid_error ERR_PROTOCOL_UNKNOWN ERR_TOO_BIG | |
2092 | # define what Squid errors indicate receiving nothing: | |
2093 | acl serverTalksFirstProtocol squid_error ERR_REQUEST_START_TIMEOUT | |
2094 | # tunnel everything that does not look like HTTP: | |
2095 | on_unsupported_protocol tunnel foreignProtocol | |
2096 | # tunnel if we think the client waits for the server to talk first: | |
2097 | on_unsupported_protocol tunnel serverTalksFirstProtocol | |
2098 | # in all other error cases, just send an HTTP "error page" response: | |
2099 | on_unsupported_protocol respond all | |
2100 | ||
2101 | See also: squid_error ACL | |
2102 | DOC_END | |
2103 | ||
d6e94bda AJ |
2104 | NAME: auth_schemes |
2105 | TYPE: AuthSchemes | |
2106 | IFDEF: USE_AUTH | |
2107 | LOC: Auth::TheConfig.schemeAccess | |
2108 | DEFAULT: none | |
2109 | DEFAULT_DOC: use all auth_param schemes in their configuration order | |
2110 | DOC_START | |
2111 | Use this directive to customize authentication schemes presence and | |
2112 | order in Squid's Unauthorized and Authentication Required responses. | |
2113 | ||
2114 | auth_schemes scheme1,scheme2,... [!]aclname ... | |
2115 | ||
2116 | where schemeN is the name of one of the authentication schemes | |
2117 | configured using auth_param directives. At least one scheme name is | |
2118 | required. Multiple scheme names are separated by commas. Either | |
2119 | avoid whitespace or quote the entire schemes list. | |
2120 | ||
2121 | A special "ALL" scheme name expands to all auth_param-configured | |
2122 | schemes in their configuration order. This directive cannot be used | |
2123 | to configure Squid to offer no authentication schemes at all. | |
2124 | ||
2125 | The first matching auth_schemes rule determines the schemes order | |
2126 | for the current Authentication Required transaction. Note that the | |
2127 | future response is not yet available during auth_schemes evaluation. | |
2128 | ||
2129 | If this directive is not used or none of its rules match, then Squid | |
2130 | responds with all configured authentication schemes in the order of | |
2131 | auth_param directives in the configuration file. | |
2132 | ||
2133 | This directive does not determine when authentication is used or | |
2134 | how each authentication scheme authenticates clients. | |
2135 | ||
2136 | The following example sends basic and negotiate authentication | |
2137 | schemes, in that order, when requesting authentication of HTTP | |
2138 | requests matching the isIE ACL (not shown) while sending all | |
2139 | auth_param schemes in their configuration order to other clients: | |
2140 | ||
2141 | auth_schemes basic,negotiate isIE | |
2142 | auth_schemes ALL all # explicit default | |
2143 | ||
2144 | This directive supports fast ACLs only. | |
2145 | ||
2146 | See also: auth_param. | |
2147 | DOC_END | |
2148 | ||
5b0f5383 | 2149 | COMMENT_START |
2150 | NETWORK OPTIONS | |
2151 | ----------------------------------------------------------------------------- | |
2152 | COMMENT_END | |
2153 | ||
2154 | NAME: http_port ascii_port | |
65d448bc | 2155 | TYPE: PortCfg |
5b0f5383 | 2156 | DEFAULT: none |
fa720bfb | 2157 | LOC: HttpPortList |
5b0f5383 | 2158 | DOC_START |
c7b1dd5d AJ |
2159 | Usage: port [mode] [options] |
2160 | hostname:port [mode] [options] | |
2161 | 1.2.3.4:port [mode] [options] | |
5b0f5383 | 2162 | |
2163 | The socket addresses where Squid will listen for HTTP client | |
2164 | requests. You may specify multiple socket addresses. | |
2165 | There are three forms: port alone, hostname with port, and | |
2166 | IP address with port. If you specify a hostname or IP | |
2167 | address, Squid binds the socket to that specific | |
c7b1dd5d | 2168 | address. Most likely, you do not need to bind to a specific |
5b0f5383 | 2169 | address, so you can use the port number alone. |
2170 | ||
2171 | If you are running Squid in accelerator mode, you | |
2172 | probably want to listen on port 80 also, or instead. | |
2173 | ||
2174 | The -a command line option may be used to specify additional | |
2175 | port(s) where Squid listens for proxy request. Such ports will | |
2176 | be plain proxy ports with no options. | |
2177 | ||
2178 | You may specify multiple socket addresses on multiple lines. | |
2179 | ||
c7b1dd5d | 2180 | Modes: |
5b0f5383 | 2181 | |
16ae256c AJ |
2182 | intercept Support for IP-Layer NAT interception delivering |
2183 | traffic to this Squid port. | |
2184 | NP: disables authentication on the port. | |
5b0f5383 | 2185 | |
16ae256c AJ |
2186 | tproxy Support Linux TPROXY (or BSD divert-to) with spoofing |
2187 | of outgoing connections using the client IP address. | |
2188 | NP: disables authentication on the port. | |
5b0f5383 | 2189 | |
7f45065d | 2190 | accel Accelerator / reverse proxy mode |
5b0f5383 | 2191 | |
caf3666d | 2192 | ssl-bump For each CONNECT request allowed by ssl_bump ACLs, |
c7b1dd5d | 2193 | establish secure connection with the client and with |
caf3666d | 2194 | the server, decrypt HTTPS messages as they pass through |
c7b1dd5d AJ |
2195 | Squid, and treat them as unencrypted HTTP messages, |
2196 | becoming the man-in-the-middle. | |
2197 | ||
7a957a93 | 2198 | The ssl_bump option is required to fully enable |
caf3666d | 2199 | bumping of CONNECT requests. |
c7b1dd5d AJ |
2200 | |
2201 | Omitting the mode flag causes default forward proxy mode to be used. | |
2202 | ||
2203 | ||
2204 | Accelerator Mode Options: | |
2205 | ||
5b0f5383 | 2206 | defaultsite=domainname |
2207 | What to use for the Host: header if it is not present | |
2208 | in a request. Determines what site (not origin server) | |
2209 | accelerators should consider the default. | |
5b0f5383 | 2210 | |
cf673853 | 2211 | no-vhost Disable using HTTP/1.1 Host header for virtual domain support. |
5b0f5383 | 2212 | |
a9f60805 AJ |
2213 | protocol= Protocol to reconstruct accelerated and intercepted |
2214 | requests with. Defaults to HTTP/1.1 for http_port and | |
2215 | HTTPS/1.1 for https_port. | |
2216 | When an unsupported value is configured Squid will | |
2217 | produce a FATAL error. | |
2218 | Values: HTTP or HTTP/1.1, HTTPS or HTTPS/1.1 | |
5b0f5383 | 2219 | |
cf673853 AJ |
2220 | vport Virtual host port support. Using the http_port number |
2221 | instead of the port passed on Host: headers. | |
5b0f5383 | 2222 | |
cf673853 AJ |
2223 | vport=NN Virtual host port support. Using the specified port |
2224 | number instead of the port passed on Host: headers. | |
5b0f5383 | 2225 | |
7f45065d HN |
2226 | act-as-origin |
2227 | Act as if this Squid is the origin server. | |
2228 | This currently means generate new Date: and Expires: | |
2229 | headers on HIT instead of adding Age:. | |
5b0f5383 | 2230 | |
432bc83c HN |
2231 | ignore-cc Ignore request Cache-Control headers. |
2232 | ||
7f45065d | 2233 | WARNING: This option violates HTTP specifications if |
432bc83c HN |
2234 | used in non-accelerator setups. |
2235 | ||
7f45065d HN |
2236 | allow-direct Allow direct forwarding in accelerator mode. Normally |
2237 | accelerated requests are denied direct forwarding as if | |
2238 | never_direct was used. | |
2239 | ||
2240 | WARNING: this option opens accelerator mode to security | |
2241 | vulnerabilities usually only affecting in interception | |
2242 | mode. Make sure to protect forwarding with suitable | |
2243 | http_access rules when using this. | |
2244 | ||
c7b1dd5d AJ |
2245 | |
2246 | SSL Bump Mode Options: | |
859741ed AJ |
2247 | In addition to these options ssl-bump requires TLS/SSL options. |
2248 | ||
2249 | generate-host-certificates[=<on|off>] | |
2250 | Dynamically create SSL server certificates for the | |
2251 | destination hosts of bumped CONNECT requests.When | |
2252 | enabled, the cert and key options are used to sign | |
2253 | generated certificates. Otherwise generated | |
2254 | certificate will be selfsigned. | |
2255 | If there is a CA certificate lifetime of the generated | |
2256 | certificate equals lifetime of the CA certificate. If | |
2257 | generated certificate is selfsigned lifetime is three | |
2258 | years. | |
2259 | This option is enabled by default when ssl-bump is used. | |
2260 | See the ssl-bump option above for more information. | |
2261 | ||
2262 | dynamic_cert_mem_cache_size=SIZE | |
2263 | Approximate total RAM size spent on cached generated | |
2264 | certificates. If set to zero, caching is disabled. The | |
23bb0ebf | 2265 | default value is 4MB. |
859741ed AJ |
2266 | |
2267 | TLS / SSL Options: | |
c7b1dd5d | 2268 | |
51e09c08 AJ |
2269 | tls-cert= Path to file containing an X.509 certificate (PEM format) |
2270 | to be used in the TLS handshake ServerHello. | |
c7b1dd5d | 2271 | |
51e09c08 AJ |
2272 | If this certificate is constrained by KeyUsage TLS |
2273 | feature it must allow HTTP server usage, along with | |
2274 | any additional restrictions imposed by your choice | |
2275 | of options= settings. | |
2276 | ||
2277 | When OpenSSL is used this file may also contain a | |
2278 | chain of intermediate CA certificates to send in the | |
2279 | TLS handshake. | |
2280 | ||
2281 | When GnuTLS is used this option (and any paired | |
2282 | tls-key= option) may be repeated to load multiple | |
2283 | certificates for different domains. | |
2284 | ||
2285 | Also, when generate-host-certificates=on is configured | |
2286 | the first tls-cert= option must be a CA certificate | |
2287 | capable of signing the automatically generated | |
2288 | certificates. | |
2289 | ||
2290 | tls-key= Path to a file containing private key file (PEM format) | |
2291 | for the previous tls-cert= option. | |
2292 | ||
2293 | If tls-key= is not specified tls-cert= is assumed to | |
2294 | reference a PEM file containing both the certificate | |
2295 | and private key. | |
c7b1dd5d | 2296 | |
c7b1dd5d | 2297 | cipher= Colon separated list of supported ciphers. |
bebdc6fb AJ |
2298 | NOTE: some ciphers such as EDH ciphers depend on |
2299 | additional settings. If those settings are | |
2300 | omitted the ciphers may be silently ignored | |
2301 | by the OpenSSL library. | |
c7b1dd5d | 2302 | |
943c5f16 | 2303 | options= Various SSL implementation options. The most important |
c7b1dd5d | 2304 | being: |
7905e7be | 2305 | |
3d96b0e8 | 2306 | NO_SSLv3 Disallow the use of SSLv3 |
1f1f29e8 | 2307 | |
3d96b0e8 | 2308 | NO_TLSv1 Disallow the use of TLSv1.0 |
1f1f29e8 | 2309 | |
3d96b0e8 | 2310 | NO_TLSv1_1 Disallow the use of TLSv1.1 |
1f1f29e8 | 2311 | |
3d96b0e8 | 2312 | NO_TLSv1_2 Disallow the use of TLSv1.2 |
1f1f29e8 | 2313 | |
7905e7be AJ |
2314 | SINGLE_DH_USE |
2315 | Always create a new key when using | |
c7b1dd5d | 2316 | temporary/ephemeral DH key exchanges |
1f1f29e8 | 2317 | |
54fbe371 PM |
2318 | SINGLE_ECDH_USE |
2319 | Enable ephemeral ECDH key exchange. | |
2320 | The adopted curve should be specified | |
2321 | using the tls-dh option. | |
2322 | ||
36092741 | 2323 | NO_TICKET |
1f1f29e8 AJ |
2324 | Disable use of RFC5077 session tickets. |
2325 | Some servers may have problems | |
2326 | understanding the TLS extension due | |
2327 | to ambiguous specification in RFC4507. | |
2328 | ||
943c5f16 HN |
2329 | ALL Enable various bug workarounds |
2330 | suggested as "harmless" by OpenSSL | |
2331 | Be warned that this reduces SSL/TLS | |
2332 | strength to some attacks. | |
7905e7be AJ |
2333 | |
2334 | See the OpenSSL SSL_CTX_set_options documentation for a | |
2335 | more complete list. | |
c7b1dd5d AJ |
2336 | |
2337 | clientca= File containing the list of CAs to use when | |
2338 | requesting a client certificate. | |
2339 | ||
86a84cc0 AJ |
2340 | tls-cafile= PEM file containing CA certificates to use when verifying |
2341 | client certificates. If not configured clientca will be | |
2342 | used. May be repeated to load multiple files. | |
c7b1dd5d AJ |
2343 | |
2344 | capath= Directory containing additional CA certificates | |
2345 | and CRL lists to use when verifying client certificates. | |
86a84cc0 | 2346 | Requires OpenSSL or LibreSSL. |
c7b1dd5d AJ |
2347 | |
2348 | crlfile= File of additional CRL lists to use when verifying | |
2349 | the client certificate, in addition to CRLs stored in | |
2350 | the capath. Implies VERIFY_CRL flag below. | |
2351 | ||
54fbe371 PM |
2352 | tls-dh=[curve:]file |
2353 | File containing DH parameters for temporary/ephemeral DH key | |
2354 | exchanges, optionally prefixed by a curve for ephemeral ECDH | |
2355 | key exchanges. | |
2356 | See OpenSSL documentation for details on how to create the | |
2357 | DH parameter file. Supported curves for ECDH can be listed | |
2358 | using the "openssl ecparam -list_curves" command. | |
2359 | WARNING: EDH and EECDH ciphers will be silently disabled if | |
2360 | this option is not set. | |
c7b1dd5d AJ |
2361 | |
2362 | sslflags= Various flags modifying the use of SSL: | |
2363 | DELAYED_AUTH | |
2364 | Don't request client certificates | |
2365 | immediately, but wait until acl processing | |
2366 | requires a certificate (not yet implemented). | |
c7b1dd5d AJ |
2367 | NO_SESSION_REUSE |
2368 | Don't allow for session reuse. Each connection | |
2369 | will result in a new SSL session. | |
2370 | VERIFY_CRL | |
2371 | Verify CRL lists when accepting client | |
2372 | certificates. | |
2373 | VERIFY_CRL_ALL | |
2374 | Verify CRL lists for all certificates in the | |
2375 | client certificate chain. | |
2376 | ||
435c72b0 AJ |
2377 | tls-default-ca[=off] |
2378 | Whether to use the system Trusted CAs. Default is OFF. | |
8b253b83 | 2379 | |
b05d749d AJ |
2380 | tls-no-npn Do not use the TLS NPN extension to advertise HTTP/1.1. |
2381 | ||
c7b1dd5d AJ |
2382 | sslcontext= SSL session ID context identifier. |
2383 | ||
c7b1dd5d AJ |
2384 | Other Options: |
2385 | ||
6b185b50 AJ |
2386 | connection-auth[=on|off] |
2387 | use connection-auth=off to tell Squid to prevent | |
2388 | forwarding Microsoft connection oriented authentication | |
d67acb4e AJ |
2389 | (NTLM, Negotiate and Kerberos) |
2390 | ||
5b0f5383 | 2391 | disable-pmtu-discovery= |
2392 | Control Path-MTU discovery usage: | |
2393 | off lets OS decide on what to do (default). | |
2394 | transparent disable PMTU discovery when transparent | |
2395 | support is enabled. | |
2396 | always disable always PMTU discovery. | |
2397 | ||
2398 | In many setups of transparently intercepting proxies | |
2399 | Path-MTU discovery can not work on traffic towards the | |
2400 | clients. This is the case when the intercepting device | |
2401 | does not fully track connections and fails to forward | |
2402 | ICMP must fragment messages to the cache server. If you | |
2403 | have such setup and experience that certain clients | |
2404 | sporadically hang or never complete requests set | |
2405 | disable-pmtu-discovery option to 'transparent'. | |
2406 | ||
81b6e9a7 | 2407 | name= Specifies a internal name for the port. Defaults to |
2408 | the port specification (port or addr:port) | |
2409 | ||
68924b6d | 2410 | tcpkeepalive[=idle,interval,timeout] |
fb6c6dbe AJ |
2411 | Enable TCP keepalive probes of idle connections. |
2412 | In seconds; idle is the initial time before TCP starts | |
2413 | probing the connection, interval how often to probe, and | |
b2130d58 | 2414 | timeout the time before giving up. |
2415 | ||
d3d92daa | 2416 | require-proxy-header |
151ba0d4 | 2417 | Require PROXY protocol version 1 or 2 connections. |
d3d92daa | 2418 | The proxy_protocol_access is required to whitelist |
151ba0d4 AJ |
2419 | downstream proxies which can be trusted. |
2420 | ||
5b0f5383 | 2421 | If you run Squid on a dual-homed machine with an internal |
2422 | and an external interface we recommend you to specify the | |
2423 | internal address:port in http_port. This way Squid will only be | |
2424 | visible on the internal address. | |
2425 | ||
2426 | NOCOMMENT_START | |
e0855596 | 2427 | |
5b0f5383 | 2428 | # Squid normally listens to port 3128 |
2429 | http_port @DEFAULT_HTTP_PORT@ | |
2430 | NOCOMMENT_END | |
2431 | DOC_END | |
2432 | ||
2433 | NAME: https_port | |
339e4d7a | 2434 | IFDEF: USE_GNUTLS||USE_OPENSSL |
65d448bc | 2435 | TYPE: PortCfg |
5b0f5383 | 2436 | DEFAULT: none |
339e4d7a | 2437 | LOC: HttpPortList |
5b0f5383 | 2438 | DOC_START |
51e09c08 | 2439 | Usage: [ip:]port [mode] tls-cert=certificate.pem [options] |
5b0f5383 | 2440 | |
859741ed AJ |
2441 | The socket address where Squid will listen for client requests made |
2442 | over TLS or SSL connections. Commonly referred to as HTTPS. | |
5b0f5383 | 2443 | |
859741ed | 2444 | This is most useful for situations where you are running squid in |
51e09c08 AJ |
2445 | accelerator mode and you want to do the TLS work at the accelerator |
2446 | level. | |
5b0f5383 | 2447 | |
2448 | You may specify multiple socket addresses on multiple lines, | |
9155253a | 2449 | each with their own certificate and/or options. |
5b0f5383 | 2450 | |
51e09c08 | 2451 | The tls-cert= option is mandatory on HTTPS ports. |
379e8c1c | 2452 | |
9155253a | 2453 | See http_port for a list of modes and options. |
5b0f5383 | 2454 | DOC_END |
2455 | ||
434a79b0 DK |
2456 | NAME: ftp_port |
2457 | TYPE: PortCfg | |
2458 | DEFAULT: none | |
8ea0d847 | 2459 | LOC: FtpPortList |
434a79b0 | 2460 | DOC_START |
8a2f40dd AR |
2461 | Enables Native FTP proxy by specifying the socket address where Squid |
2462 | listens for FTP client requests. See http_port directive for various | |
2463 | ways to specify the listening address and mode. | |
2464 | ||
2465 | Usage: ftp_port address [mode] [options] | |
2466 | ||
2467 | WARNING: This is a new, experimental, complex feature that has seen | |
2468 | limited production exposure. Some Squid modules (e.g., caching) do not | |
2469 | currently work with native FTP proxying, and many features have not | |
2470 | even been tested for compatibility. Test well before deploying! | |
2471 | ||
2472 | Native FTP proxying differs substantially from proxying HTTP requests | |
2473 | with ftp:// URIs because Squid works as an FTP server and receives | |
2474 | actual FTP commands (rather than HTTP requests with FTP URLs). | |
2475 | ||
2476 | Native FTP commands accepted at ftp_port are internally converted or | |
2477 | wrapped into HTTP-like messages. The same happens to Native FTP | |
2478 | responses received from FTP origin servers. Those HTTP-like messages | |
2479 | are shoveled through regular access control and adaptation layers | |
2480 | between the FTP client and the FTP origin server. This allows Squid to | |
2481 | examine, adapt, block, and log FTP exchanges. Squid reuses most HTTP | |
2482 | mechanisms when shoveling wrapped FTP messages. For example, | |
2483 | http_access and adaptation_access directives are used. | |
2484 | ||
2485 | Modes: | |
2486 | ||
3cc0f4e7 | 2487 | intercept Same as http_port intercept. The FTP origin address is |
8a2f40dd AR |
2488 | determined based on the intended destination of the |
2489 | intercepted connection. | |
2490 | ||
3cc0f4e7 AR |
2491 | tproxy Support Linux TPROXY for spoofing outgoing |
2492 | connections using the client IP address. | |
2493 | NP: disables authentication and maybe IPv6 on the port. | |
2494 | ||
8a2f40dd AR |
2495 | By default (i.e., without an explicit mode option), Squid extracts the |
2496 | FTP origin address from the login@origin parameter of the FTP USER | |
2497 | command. Many popular FTP clients support such native FTP proxying. | |
2498 | ||
2499 | Options: | |
2500 | ||
3cc0f4e7 AR |
2501 | name=token Specifies an internal name for the port. Defaults to |
2502 | the port address. Usable with myportname ACL. | |
2503 | ||
aea65fec | 2504 | ftp-track-dirs |
8a2f40dd AR |
2505 | Enables tracking of FTP directories by injecting extra |
2506 | PWD commands and adjusting Request-URI (in wrapping | |
2507 | HTTP requests) to reflect the current FTP server | |
aea65fec | 2508 | directory. Tracking is disabled by default. |
8a2f40dd | 2509 | |
3cc0f4e7 AR |
2510 | protocol=FTP Protocol to reconstruct accelerated and intercepted |
2511 | requests with. Defaults to FTP. No other accepted | |
2512 | values have been tested with. An unsupported value | |
2513 | results in a FATAL error. Accepted values are FTP, | |
2514 | HTTP (or HTTP/1.1), and HTTPS (or HTTPS/1.1). | |
2515 | ||
8a2f40dd AR |
2516 | Other http_port modes and options that are not specific to HTTP and |
2517 | HTTPS may also work. | |
2518 | DOC_END | |
434a79b0 | 2519 | |
41bd17a4 | 2520 | NAME: tcp_outgoing_tos tcp_outgoing_ds tcp_outgoing_dscp |
2521 | TYPE: acl_tos | |
5473c134 | 2522 | DEFAULT: none |
425de4c8 | 2523 | LOC: Ip::Qos::TheConfig.tosToServer |
5473c134 | 2524 | DOC_START |
425de4c8 AJ |
2525 | Allows you to select a TOS/Diffserv value for packets outgoing |
2526 | on the server side, based on an ACL. | |
5473c134 | 2527 | |
41bd17a4 | 2528 | tcp_outgoing_tos ds-field [!]aclname ... |
cccac0a2 | 2529 | |
41bd17a4 | 2530 | Example where normal_service_net uses the TOS value 0x00 |
7def7206 | 2531 | and good_service_net uses 0x20 |
cccac0a2 | 2532 | |
864a62b5 AJ |
2533 | acl normal_service_net src 10.0.0.0/24 |
2534 | acl good_service_net src 10.0.1.0/24 | |
2c73de90 | 2535 | tcp_outgoing_tos 0x00 normal_service_net |
41bd17a4 | 2536 | tcp_outgoing_tos 0x20 good_service_net |
fa38076e | 2537 | |
41bd17a4 | 2538 | TOS/DSCP values really only have local significance - so you should |
575cb927 AJ |
2539 | know what you're specifying. For more information, see RFC2474, |
2540 | RFC2475, and RFC3260. | |
cccac0a2 | 2541 | |
41bd17a4 | 2542 | The TOS/DSCP byte must be exactly that - a octet value 0 - 255, or |
5f53baab SM |
2543 | "default" to use whatever default your host has. |
2544 | Note that only multiples of 4 are usable as the two rightmost bits have | |
2545 | been redefined for use by ECN (RFC 3168 section 23.1). | |
2546 | The squid parser will enforce this by masking away the ECN bits. | |
cccac0a2 | 2547 | |
41bd17a4 | 2548 | Processing proceeds in the order specified, and stops at first fully |
2549 | matching line. | |
c6f168c1 CT |
2550 | |
2551 | Only fast ACLs are supported. | |
cccac0a2 | 2552 | DOC_END |
2553 | ||
41bd17a4 | 2554 | NAME: clientside_tos |
2555 | TYPE: acl_tos | |
cccac0a2 | 2556 | DEFAULT: none |
425de4c8 AJ |
2557 | LOC: Ip::Qos::TheConfig.tosToClient |
2558 | DOC_START | |
5f53baab | 2559 | Allows you to select a TOS/DSCP value for packets being transmitted |
425de4c8 AJ |
2560 | on the client-side, based on an ACL. |
2561 | ||
2562 | clientside_tos ds-field [!]aclname ... | |
2563 | ||
2564 | Example where normal_service_net uses the TOS value 0x00 | |
2565 | and good_service_net uses 0x20 | |
2566 | ||
2567 | acl normal_service_net src 10.0.0.0/24 | |
2568 | acl good_service_net src 10.0.1.0/24 | |
2569 | clientside_tos 0x00 normal_service_net | |
2570 | clientside_tos 0x20 good_service_net | |
2571 | ||
2572 | Note: This feature is incompatible with qos_flows. Any TOS values set here | |
2573 | will be overwritten by TOS values in qos_flows. | |
5f53baab SM |
2574 | |
2575 | The TOS/DSCP byte must be exactly that - a octet value 0 - 255, or | |
2576 | "default" to use whatever default your host has. | |
2577 | Note that only multiples of 4 are usable as the two rightmost bits have | |
2578 | been redefined for use by ECN (RFC 3168 section 23.1). | |
2579 | The squid parser will enforce this by masking away the ECN bits. | |
2580 | ||
83a846a3 AR |
2581 | This clause only supports fast acl types. |
2582 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
425de4c8 AJ |
2583 | DOC_END |
2584 | ||
2585 | NAME: tcp_outgoing_mark | |
2586 | TYPE: acl_nfmark | |
11e8cfe3 | 2587 | IFDEF: SO_MARK&&USE_LIBCAP |
425de4c8 AJ |
2588 | DEFAULT: none |
2589 | LOC: Ip::Qos::TheConfig.nfmarkToServer | |
2590 | DOC_START | |
2591 | Allows you to apply a Netfilter mark value to outgoing packets | |
2592 | on the server side, based on an ACL. | |
2593 | ||
2594 | tcp_outgoing_mark mark-value [!]aclname ... | |
2595 | ||
2596 | Example where normal_service_net uses the mark value 0x00 | |
2597 | and good_service_net uses 0x20 | |
2598 | ||
2599 | acl normal_service_net src 10.0.0.0/24 | |
2600 | acl good_service_net src 10.0.1.0/24 | |
2601 | tcp_outgoing_mark 0x00 normal_service_net | |
2602 | tcp_outgoing_mark 0x20 good_service_net | |
c6f168c1 CT |
2603 | |
2604 | Only fast ACLs are supported. | |
425de4c8 AJ |
2605 | DOC_END |
2606 | ||
244da4ad | 2607 | NAME: mark_client_packet clientside_mark |
425de4c8 | 2608 | TYPE: acl_nfmark |
11e8cfe3 | 2609 | IFDEF: SO_MARK&&USE_LIBCAP |
425de4c8 AJ |
2610 | DEFAULT: none |
2611 | LOC: Ip::Qos::TheConfig.nfmarkToClient | |
cccac0a2 | 2612 | DOC_START |
244da4ad | 2613 | Allows you to apply a Netfilter MARK value to packets being transmitted |
425de4c8 AJ |
2614 | on the client-side, based on an ACL. |
2615 | ||
244da4ad | 2616 | mark_client_packet mark-value [!]aclname ... |
425de4c8 | 2617 | |
244da4ad | 2618 | Example where normal_service_net uses the MARK value 0x00 |
425de4c8 AJ |
2619 | and good_service_net uses 0x20 |
2620 | ||
2621 | acl normal_service_net src 10.0.0.0/24 | |
2622 | acl good_service_net src 10.0.1.0/24 | |
244da4ad AG |
2623 | mark_client_packet 0x00 normal_service_net |
2624 | mark_client_packet 0x20 good_service_net | |
425de4c8 AJ |
2625 | |
2626 | Note: This feature is incompatible with qos_flows. Any mark values set here | |
2627 | will be overwritten by mark values in qos_flows. | |
83a846a3 AR |
2628 | |
2629 | This clause only supports fast acl types. | |
2630 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
41bd17a4 | 2631 | DOC_END |
cccac0a2 | 2632 | |
244da4ad AG |
2633 | NAME: mark_client_connection |
2634 | TYPE: acl_nfmark | |
2635 | IFDEF: SO_MARK&&USE_LIBCAP | |
2636 | DEFAULT: none | |
2637 | LOC: Ip::Qos::TheConfig.nfConnmarkToClient | |
2638 | DOC_START | |
2639 | Allows you to apply a Netfilter CONNMARK value to a connection | |
2640 | on the client-side, based on an ACL. | |
2641 | ||
2642 | mark_client_connection mark-value[/mask] [!]aclname ... | |
2643 | ||
2644 | The mark-value and mask are unsigned integers (hex, octal, or decimal). | |
2645 | The mask may be used to preserve marking previously set by other agents | |
2646 | (e.g., iptables). | |
2647 | ||
2648 | A matching rule replaces the CONNMARK value. If a mask is also | |
2649 | specified, then the masked bits of the original value are zeroed, and | |
2650 | the configured mark-value is ORed with that adjusted value. | |
2651 | For example, applying a mark-value 0xAB/0xF to 0x5F CONNMARK, results | |
2652 | in a 0xFB marking (rather than a 0xAB or 0x5B). | |
2653 | ||
2654 | This directive semantics is similar to iptables --set-mark rather than | |
2655 | --set-xmark functionality. | |
2656 | ||
2657 | The directive does not interfere with qos_flows (which uses packet MARKs, | |
2658 | not CONNMARKs). | |
2659 | ||
2660 | Example where squid marks intercepted FTP connections: | |
2661 | ||
2662 | acl proto_ftp proto FTP | |
2663 | mark_client_connection 0x200/0xff00 proto_ftp | |
2664 | ||
2665 | This clause only supports fast acl types. | |
2666 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
2667 | DOC_END | |
2668 | ||
575cb927 AJ |
2669 | NAME: qos_flows |
2670 | TYPE: QosConfig | |
425de4c8 | 2671 | IFDEF: USE_QOS_TOS |
575cb927 | 2672 | DEFAULT: none |
b7ac5457 | 2673 | LOC: Ip::Qos::TheConfig |
7172612f | 2674 | DOC_START |
575cb927 | 2675 | Allows you to select a TOS/DSCP value to mark outgoing |
196a7776 AB |
2676 | connections to the client, based on where the reply was sourced. |
2677 | For platforms using netfilter, allows you to set a netfilter mark | |
425de4c8 | 2678 | value instead of, or in addition to, a TOS value. |
7172612f | 2679 | |
196a7776 AB |
2680 | By default this functionality is disabled. To enable it with the default |
2681 | settings simply use "qos_flows mark" or "qos_flows tos". Default | |
2682 | settings will result in the netfilter mark or TOS value being copied | |
2683 | from the upstream connection to the client. Note that it is the connection | |
2684 | CONNMARK value not the packet MARK value that is copied. | |
2685 | ||
2686 | It is not currently possible to copy the mark or TOS value from the | |
2687 | client to the upstream connection request. | |
2688 | ||
575cb927 AJ |
2689 | TOS values really only have local significance - so you should |
2690 | know what you're specifying. For more information, see RFC2474, | |
2691 | RFC2475, and RFC3260. | |
7172612f | 2692 | |
5f53baab SM |
2693 | The TOS/DSCP byte must be exactly that - a octet value 0 - 255. |
2694 | Note that only multiples of 4 are usable as the two rightmost bits have | |
2695 | been redefined for use by ECN (RFC 3168 section 23.1). | |
2696 | The squid parser will enforce this by masking away the ECN bits. | |
425de4c8 AJ |
2697 | |
2698 | Mark values can be any unsigned 32-bit integer value. | |
7172612f | 2699 | |
425de4c8 AJ |
2700 | This setting is configured by setting the following values: |
2701 | ||
2702 | tos|mark Whether to set TOS or netfilter mark values | |
575cb927 AJ |
2703 | |
2704 | local-hit=0xFF Value to mark local cache hits. | |
2705 | ||
2706 | sibling-hit=0xFF Value to mark hits from sibling peers. | |
2707 | ||
2708 | parent-hit=0xFF Value to mark hits from parent peers. | |
2709 | ||
a29d2a95 AB |
2710 | miss=0xFF[/mask] Value to mark cache misses. Takes precedence |
2711 | over the preserve-miss feature (see below), unless | |
2712 | mask is specified, in which case only the bits | |
2713 | specified in the mask are written. | |
575cb927 | 2714 | |
425de4c8 AJ |
2715 | The TOS variant of the following features are only possible on Linux |
2716 | and require your kernel to be patched with the TOS preserving ZPH | |
2717 | patch, available from http://zph.bratcheda.org | |
2718 | No patch is needed to preserve the netfilter mark, which will work | |
2719 | with all variants of netfilter. | |
575cb927 | 2720 | |
575cb927 | 2721 | disable-preserve-miss |
425de4c8 AJ |
2722 | This option disables the preservation of the TOS or netfilter |
2723 | mark. By default, the existing TOS or netfilter mark value of | |
2724 | the response coming from the remote server will be retained | |
2725 | and masked with miss-mark. | |
2726 | NOTE: in the case of a netfilter mark, the mark must be set on | |
2727 | the connection (using the CONNMARK target) not on the packet | |
2728 | (MARK target). | |
575cb927 AJ |
2729 | |
2730 | miss-mask=0xFF | |
425de4c8 AJ |
2731 | Allows you to mask certain bits in the TOS or mark value |
2732 | received from the remote server, before copying the value to | |
2733 | the TOS sent towards clients. | |
2734 | Default for tos: 0xFF (TOS from server is not changed). | |
2735 | Default for mark: 0xFFFFFFFF (mark from server is not changed). | |
2736 | ||
2737 | All of these features require the --enable-zph-qos compilation flag | |
2738 | (enabled by default). Netfilter marking also requires the | |
2739 | libnetfilter_conntrack libraries (--with-netfilter-conntrack) and | |
2740 | libcap 2.09+ (--with-libcap). | |
7172612f | 2741 | |
7172612f AJ |
2742 | DOC_END |
2743 | ||
41bd17a4 | 2744 | NAME: tcp_outgoing_address |
2745 | TYPE: acl_address | |
2746 | DEFAULT: none | |
638402dd | 2747 | DEFAULT_DOC: Address selection is performed by the operating system. |
41bd17a4 | 2748 | LOC: Config.accessList.outgoing_address |
2749 | DOC_START | |
2750 | Allows you to map requests to different outgoing IP addresses | |
2751 | based on the username or source address of the user making | |
2752 | the request. | |
7f7db318 | 2753 | |
41bd17a4 | 2754 | tcp_outgoing_address ipaddr [[!]aclname] ... |
c33aa074 | 2755 | |
2dd51400 AJ |
2756 | For example; |
2757 | Forwarding clients with dedicated IPs for certain subnets. | |
9197cd13 | 2758 | |
2dd51400 AJ |
2759 | acl normal_service_net src 10.0.0.0/24 |
2760 | acl good_service_net src 10.0.2.0/24 | |
2761 | ||
2762 | tcp_outgoing_address 2001:db8::c001 good_service_net | |
2763 | tcp_outgoing_address 10.1.0.2 good_service_net | |
2764 | ||
2765 | tcp_outgoing_address 2001:db8::beef normal_service_net | |
2766 | tcp_outgoing_address 10.1.0.1 normal_service_net | |
2767 | ||
2768 | tcp_outgoing_address 2001:db8::1 | |
2769 | tcp_outgoing_address 10.1.0.3 | |
9197cd13 | 2770 | |
41bd17a4 | 2771 | Processing proceeds in the order specified, and stops at first fully |
2772 | matching line. | |
cccac0a2 | 2773 | |
2dd51400 AJ |
2774 | Squid will add an implicit IP version test to each line. |
2775 | Requests going to IPv4 websites will use the outgoing 10.1.0.* addresses. | |
2776 | Requests going to IPv6 websites will use the outgoing 2001:db8:* addresses. | |
2777 | ||
2778 | ||
2779 | NOTE: The use of this directive using client dependent ACLs is | |
41bd17a4 | 2780 | incompatible with the use of server side persistent connections. To |
2781 | ensure correct results it is best to set server_persistent_connections | |
2782 | to off when using this directive in such configurations. | |
cc192b50 | 2783 | |
2dd51400 | 2784 | NOTE: The use of this directive to set a local IP on outgoing TCP links |
4ed968be | 2785 | is incompatible with using TPROXY to set client IP out outbound TCP links. |
2dd51400 AJ |
2786 | When needing to contact peers use the no-tproxy cache_peer option and the |
2787 | client_dst_passthru directive re-enable normal forwarding such as this. | |
cc192b50 | 2788 | |
83a846a3 AR |
2789 | This clause only supports fast acl types. |
2790 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
cccac0a2 | 2791 | DOC_END |
6db78a1a | 2792 | |
90529125 AJ |
2793 | NAME: host_verify_strict |
2794 | TYPE: onoff | |
2795 | DEFAULT: off | |
2796 | LOC: Config.onoff.hostStrictVerify | |
2797 | DOC_START | |
d8821934 AR |
2798 | Regardless of this option setting, when dealing with intercepted |
2799 | traffic, Squid always verifies that the destination IP address matches | |
2962f8b8 | 2800 | the Host header domain or IP (called 'authority form URL'). |
d8821934 AR |
2801 | |
2802 | This enforcement is performed to satisfy a MUST-level requirement in | |
2803 | RFC 2616 section 14.23: "The Host field value MUST represent the naming | |
2804 | authority of the origin server or gateway given by the original URL". | |
2962f8b8 AJ |
2805 | |
2806 | When set to ON: | |
2807 | Squid always responds with an HTTP 409 (Conflict) error | |
2808 | page and logs a security warning if there is no match. | |
2809 | ||
2810 | Squid verifies that the destination IP address matches | |
2811 | the Host header for forward-proxy and reverse-proxy traffic | |
2812 | as well. For those traffic types, Squid also enables the | |
2813 | following checks, comparing the corresponding Host header | |
2814 | and Request-URI components: | |
2815 | ||
2816 | * The host names (domain or IP) must be identical, | |
2817 | but valueless or missing Host header disables all checks. | |
2818 | For the two host names to match, both must be either IP | |
2819 | or FQDN. | |
2820 | ||
2821 | * Port numbers must be identical, but if a port is missing | |
2822 | the scheme-default port is assumed. | |
2823 | ||
2824 | ||
2825 | When set to OFF (the default): | |
2826 | Squid allows suspicious requests to continue but logs a | |
2827 | security warning and blocks caching of the response. | |
2828 | ||
2829 | * Forward-proxy traffic is not checked at all. | |
2830 | ||
2831 | * Reverse-proxy traffic is not checked at all. | |
2832 | ||
2833 | * Intercepted traffic which passes verification is handled | |
32c32865 | 2834 | according to client_dst_passthru. |
2962f8b8 | 2835 | |
7177edfb AJ |
2836 | * Intercepted requests which fail verification are sent |
2837 | to the client original destination instead of DIRECT. | |
2838 | This overrides 'client_dst_passthru off'. | |
2962f8b8 AJ |
2839 | |
2840 | For now suspicious intercepted CONNECT requests are always | |
2841 | responded to with an HTTP 409 (Conflict) error page. | |
bfe4e2fe | 2842 | |
bfe4e2fe | 2843 | |
7177edfb | 2844 | SECURITY NOTE: |
bfe4e2fe AJ |
2845 | |
2846 | As described in CVE-2009-0801 when the Host: header alone is used | |
2847 | to determine the destination of a request it becomes trivial for | |
2848 | malicious scripts on remote websites to bypass browser same-origin | |
2849 | security policy and sandboxing protections. | |
2850 | ||
2851 | The cause of this is that such applets are allowed to perform their | |
2852 | own HTTP stack, in which case the same-origin policy of the browser | |
2853 | sandbox only verifies that the applet tries to contact the same IP | |
2854 | as from where it was loaded at the IP level. The Host: header may | |
2855 | be different from the connected IP and approved origin. | |
7177edfb AJ |
2856 | |
2857 | DOC_END | |
6b185b50 | 2858 | |
7177edfb AJ |
2859 | NAME: client_dst_passthru |
2860 | TYPE: onoff | |
2861 | DEFAULT: on | |
2862 | LOC: Config.onoff.client_dst_passthru | |
2863 | DOC_START | |
2864 | With NAT or TPROXY intercepted traffic Squid may pass the request | |
2865 | directly to the original client destination IP or seek a faster | |
2866 | source using the HTTP Host header. | |
2867 | ||
2868 | Using Host to locate alternative servers can provide faster | |
2869 | connectivity with a range of failure recovery options. | |
2870 | But can also lead to connectivity trouble when the client and | |
2871 | server are attempting stateful interactions unaware of the proxy. | |
2872 | ||
2873 | This option (on by default) prevents alternative DNS entries being | |
2874 | located to send intercepted traffic DIRECT to an origin server. | |
2875 | The clients original destination IP and port will be used instead. | |
2876 | ||
2877 | Regardless of this option setting, when dealing with intercepted | |
2878 | traffic Squid will verify the Host: header and any traffic which | |
2879 | fails Host verification will be treated as if this option were ON. | |
2880 | ||
2881 | see host_verify_strict for details on the verification process. | |
cccac0a2 | 2882 | DOC_END |
2883 | ||
195f8adb AJ |
2884 | COMMENT_START |
2885 | TLS OPTIONS | |
2886 | ----------------------------------------------------------------------------- | |
2887 | COMMENT_END | |
2888 | ||
2889 | NAME: tls_outgoing_options | |
2890 | IFDEF: USE_GNUTLS||USE_OPENSSL | |
2891 | TYPE: securePeerOptions | |
2fbb02b1 | 2892 | DEFAULT: min-version=1.0 |
7e62a74f | 2893 | LOC: Security::ProxyOutgoingConfig |
195f8adb AJ |
2894 | DOC_START |
2895 | disable Do not support https:// URLs. | |
2896 | ||
2897 | cert=/path/to/client/certificate | |
51e09c08 | 2898 | A client X.509 certificate to use when connecting. |
195f8adb AJ |
2899 | |
2900 | key=/path/to/client/private_key | |
51e09c08 AJ |
2901 | The private key corresponding to the cert= above. |
2902 | ||
2903 | If key= is not specified cert= is assumed to | |
2904 | reference a PEM file containing both the certificate | |
2905 | and private key. | |
195f8adb | 2906 | |
195f8adb | 2907 | cipher=... The list of valid TLS ciphers to use. |
1cc44095 AJ |
2908 | |
2909 | min-version=1.N | |
2fbb02b1 AJ |
2910 | The minimum TLS protocol version to permit. |
2911 | To control SSLv3 use the options= parameter. | |
1cc44095 AJ |
2912 | Supported Values: 1.0 (default), 1.1, 1.2 |
2913 | ||
3f5b28fe | 2914 | options=... Specify various TLS/SSL implementation options. |
195f8adb | 2915 | |
3f5b28fe | 2916 | OpenSSL options most important are: |
7905e7be | 2917 | |
3f5b28fe | 2918 | NO_SSLv3 Disallow the use of SSLv3 |
7905e7be | 2919 | |
195f8adb AJ |
2920 | SINGLE_DH_USE |
2921 | Always create a new key when using | |
2922 | temporary/ephemeral DH key exchanges | |
7905e7be | 2923 | |
ce0adf1a | 2924 | NO_TICKET |
7905e7be AJ |
2925 | Disable use of RFC5077 session tickets. |
2926 | Some servers may have problems | |
2927 | understanding the TLS extension due | |
2928 | to ambiguous specification in RFC4507. | |
2929 | ||
195f8adb AJ |
2930 | ALL Enable various bug workarounds |
2931 | suggested as "harmless" by OpenSSL | |
7905e7be | 2932 | Be warned that this reduces SSL/TLS |
195f8adb AJ |
2933 | strength to some attacks. |
2934 | ||
3f5b28fe AJ |
2935 | See the OpenSSL SSL_CTX_set_options documentation |
2936 | for a more complete list. | |
2937 | ||
2938 | GnuTLS options most important are: | |
2939 | ||
2940 | %NO_TICKETS | |
2941 | Disable use of RFC5077 session tickets. | |
2942 | Some servers may have problems | |
2943 | understanding the TLS extension due | |
2944 | to ambiguous specification in RFC4507. | |
2945 | ||
2946 | See the GnuTLS Priority Strings documentation | |
2947 | for a more complete list. | |
2948 | http://www.gnutls.org/manual/gnutls.html#Priority-Strings | |
2949 | ||
195f8adb | 2950 | |
86a84cc0 AJ |
2951 | cafile= PEM file containing CA certificates to use when verifying |
2952 | the peer certificate. May be repeated to load multiple files. | |
2953 | ||
2954 | capath= A directory containing additional CA certificates to | |
195f8adb | 2955 | use when verifying the peer certificate. |
86a84cc0 | 2956 | Requires OpenSSL or LibreSSL. |
195f8adb AJ |
2957 | |
2958 | crlfile=... A certificate revocation list file to use when | |
2959 | verifying the peer certificate. | |
2960 | ||
2961 | flags=... Specify various flags modifying the TLS implementation: | |
2962 | ||
2963 | DONT_VERIFY_PEER | |
2964 | Accept certificates even if they fail to | |
2965 | verify. | |
195f8adb AJ |
2966 | DONT_VERIFY_DOMAIN |
2967 | Don't verify the peer certificate | |
2968 | matches the server name | |
2969 | ||
435c72b0 AJ |
2970 | default-ca[=off] |
2971 | Whether to use the system Trusted CAs. Default is ON. | |
8b253b83 | 2972 | |
195f8adb AJ |
2973 | domain= The peer name as advertised in its certificate. |
2974 | Used for verifying the correctness of the received peer | |
2975 | certificate. If not specified the peer hostname will be | |
2976 | used. | |
2977 | DOC_END | |
2978 | ||
41bd17a4 | 2979 | COMMENT_START |
2980 | SSL OPTIONS | |
2981 | ----------------------------------------------------------------------------- | |
2982 | COMMENT_END | |
2983 | ||
2984 | NAME: ssl_unclean_shutdown | |
cb4f4424 | 2985 | IFDEF: USE_OPENSSL |
cccac0a2 | 2986 | TYPE: onoff |
2987 | DEFAULT: off | |
41bd17a4 | 2988 | LOC: Config.SSL.unclean_shutdown |
cccac0a2 | 2989 | DOC_START |
41bd17a4 | 2990 | Some browsers (especially MSIE) bugs out on SSL shutdown |
2991 | messages. | |
cccac0a2 | 2992 | DOC_END |
2993 | ||
41bd17a4 | 2994 | NAME: ssl_engine |
cb4f4424 | 2995 | IFDEF: USE_OPENSSL |
cccac0a2 | 2996 | TYPE: string |
41bd17a4 | 2997 | LOC: Config.SSL.ssl_engine |
2998 | DEFAULT: none | |
cccac0a2 | 2999 | DOC_START |
41bd17a4 | 3000 | The OpenSSL engine to use. You will need to set this if you |
3001 | would like to use hardware SSL acceleration for example. | |
cccac0a2 | 3002 | DOC_END |
3003 | ||
10a69fc0 | 3004 | NAME: sslproxy_session_ttl |
cb4f4424 | 3005 | IFDEF: USE_OPENSSL |
10a69fc0 CT |
3006 | DEFAULT: 300 |
3007 | LOC: Config.SSL.session_ttl | |
3008 | TYPE: int | |
3009 | DOC_START | |
3010 | Sets the timeout value for SSL sessions | |
3011 | DOC_END | |
3012 | ||
3013 | NAME: sslproxy_session_cache_size | |
cb4f4424 | 3014 | IFDEF: USE_OPENSSL |
10a69fc0 CT |
3015 | DEFAULT: 2 MB |
3016 | LOC: Config.SSL.sessionCacheSize | |
3017 | TYPE: b_size_t | |
3018 | DOC_START | |
3019 | Sets the cache size to use for ssl session | |
3020 | DOC_END | |
3021 | ||
866be11c CT |
3022 | NAME: sslproxy_foreign_intermediate_certs |
3023 | IFDEF: USE_OPENSSL | |
3024 | DEFAULT: none | |
3025 | LOC: Config.ssl_client.foreignIntermediateCertsPath | |
3026 | TYPE: string | |
3027 | DOC_START | |
3028 | Many origin servers fail to send their full server certificate | |
3029 | chain for verification, assuming the client already has or can | |
3030 | easily locate any missing intermediate certificates. | |
3031 | ||
3032 | Squid uses the certificates from the specified file to fill in | |
3033 | these missing chains when trying to validate origin server | |
3034 | certificate chains. | |
3035 | ||
3036 | The file is expected to contain zero or more PEM-encoded | |
3037 | intermediate certificates. These certificates are not treated | |
3038 | as trusted root certificates, and any self-signed certificate in | |
3039 | this file will be ignored. | |
866be11c CT |
3040 | DOC_END |
3041 | ||
3c26b00a CT |
3042 | NAME: sslproxy_cert_sign_hash |
3043 | IFDEF: USE_OPENSSL | |
3044 | DEFAULT: none | |
3045 | LOC: Config.SSL.certSignHash | |
3046 | TYPE: string | |
3047 | DOC_START | |
3048 | Sets the hashing algorithm to use when signing generated certificates. | |
3049 | Valid algorithm names depend on the OpenSSL library used. The following | |
3050 | names are usually available: sha1, sha256, sha512, and md5. Please see | |
3051 | your OpenSSL library manual for the available hashes. By default, Squids | |
3052 | that support this option use sha256 hashes. | |
3053 | ||
3054 | Squid does not forcefully purge cached certificates that were generated | |
3055 | with an algorithm other than the currently configured one. They remain | |
3056 | in the cache, subject to the regular cache eviction policy, and become | |
3057 | useful if the algorithm changes again. | |
3058 | DOC_END | |
3059 | ||
4c9da963 | 3060 | NAME: ssl_bump |
cb4f4424 | 3061 | IFDEF: USE_OPENSSL |
caf3666d | 3062 | TYPE: sslproxy_ssl_bump |
4c9da963 | 3063 | LOC: Config.accessList.ssl_bump |
8f165829 | 3064 | DEFAULT_DOC: Become a TCP tunnel without decrypting proxied traffic. |
4c9da963 | 3065 | DEFAULT: none |
3066 | DOC_START | |
caf3666d AR |
3067 | This option is consulted when a CONNECT request is received on |
3068 | an http_port (or a new connection is intercepted at an | |
3069 | https_port), provided that port was configured with an ssl-bump | |
3070 | flag. The subsequent data on the connection is either treated as | |
3071 | HTTPS and decrypted OR tunneled at TCP level without decryption, | |
8f165829 AR |
3072 | depending on the first matching bumping "action". |
3073 | ||
3074 | ssl_bump <action> [!]acl ... | |
caf3666d | 3075 | |
8f165829 | 3076 | The following bumping actions are currently supported: |
caf3666d | 3077 | |
5d65362c | 3078 | splice |
8f165829 AR |
3079 | Become a TCP tunnel without decrypting proxied traffic. |
3080 | This is the default action. | |
5d65362c CT |
3081 | |
3082 | bump | |
6e0516b3 CT |
3083 | When used on step SslBump1, establishes a secure connection |
3084 | with the client first, then connect to the server. | |
3085 | When used on step SslBump2 or SslBump3, establishes a secure | |
3086 | connection with the server and, using a mimicked server | |
3087 | certificate, with the client. | |
caf3666d | 3088 | |
5d65362c | 3089 | peek |
1110989a | 3090 | Receive client (step SslBump1) or server (step SslBump2) |
8f165829 AR |
3091 | certificate while preserving the possibility of splicing the |
3092 | connection. Peeking at the server certificate (during step 2) | |
3093 | usually precludes bumping of the connection at step 3. | |
caf3666d | 3094 | |
5d65362c | 3095 | stare |
1110989a | 3096 | Receive client (step SslBump1) or server (step SslBump2) |
8f165829 AR |
3097 | certificate while preserving the possibility of bumping the |
3098 | connection. Staring at the server certificate (during step 2) | |
3099 | usually precludes splicing of the connection at step 3. | |
5d65362c CT |
3100 | |
3101 | terminate | |
3102 | Close client and server connections. | |
3103 | ||
1110989a | 3104 | Backward compatibility actions available at step SslBump1: |
caf3666d AR |
3105 | |
3106 | client-first | |
8f165829 AR |
3107 | Bump the connection. Establish a secure connection with the |
3108 | client first, then connect to the server. This old mode does | |
3109 | not allow Squid to mimic server SSL certificate and does not | |
3110 | work with intercepted SSL connections. | |
caf3666d AR |
3111 | |
3112 | server-first | |
8f165829 AR |
3113 | Bump the connection. Establish a secure connection with the |
3114 | server first, then establish a secure connection with the | |
3115 | client, using a mimicked server certificate. Works with both | |
3116 | CONNECT requests and intercepted SSL connections, but does | |
3117 | not allow to make decisions based on SSL handshake info. | |
caf3666d | 3118 | |
8f165829 AR |
3119 | peek-and-splice |
3120 | Decide whether to bump or splice the connection based on | |
d620ae0e | 3121 | client-to-squid and server-to-squid SSL hello messages. |
8f165829 | 3122 | XXX: Remove. |
caf3666d | 3123 | |
caf3666d | 3124 | none |
8f165829 | 3125 | Same as the "splice" action. |
caf3666d | 3126 | |
8f165829 AR |
3127 | All ssl_bump rules are evaluated at each of the supported bumping |
3128 | steps. Rules with actions that are impossible at the current step are | |
3129 | ignored. The first matching ssl_bump action wins and is applied at the | |
3130 | end of the current step. If no rules match, the splice action is used. | |
652fcffd | 3131 | See the at_step ACL for a list of the supported SslBump steps. |
4c9da963 | 3132 | |
e0c0d54c | 3133 | This clause supports both fast and slow acl types. |
b3567eb5 | 3134 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. |
e0855596 | 3135 | |
652fcffd | 3136 | See also: http_port ssl-bump, https_port ssl-bump, and acl at_step. |
caf3666d | 3137 | |
e0855596 | 3138 | |
f3fece95 | 3139 | # Example: Bump all TLS connections except those originating from |
638402dd | 3140 | # localhost or those going to example.com. |
e0855596 | 3141 | |
f3fece95 | 3142 | acl broken_sites ssl::server_name .example.com |
8f165829 AR |
3143 | ssl_bump splice localhost |
3144 | ssl_bump splice broken_sites | |
3145 | ssl_bump bump all | |
4c9da963 | 3146 | DOC_END |
3147 | ||
4c9da963 | 3148 | NAME: sslproxy_cert_error |
cb4f4424 | 3149 | IFDEF: USE_OPENSSL |
4c9da963 | 3150 | DEFAULT: none |
638402dd | 3151 | DEFAULT_DOC: Server certificate errors terminate the transaction. |
4c9da963 | 3152 | LOC: Config.ssl_client.cert_error |
3153 | TYPE: acl_access | |
3154 | DOC_START | |
3155 | Use this ACL to bypass server certificate validation errors. | |
3156 | ||
3157 | For example, the following lines will bypass all validation errors | |
3b8f558c | 3158 | when talking to servers for example.com. All other |
4c9da963 | 3159 | validation errors will result in ERR_SECURE_CONNECT_FAIL error. |
3160 | ||
a87bfd3b AR |
3161 | acl BrokenButTrustedServers dstdomain example.com |
3162 | sslproxy_cert_error allow BrokenButTrustedServers | |
4c9da963 | 3163 | sslproxy_cert_error deny all |
3164 | ||
b3567eb5 FC |
3165 | This clause only supports fast acl types. |
3166 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
3167 | Using slow acl types may result in server crashes | |
4c9da963 | 3168 | |
3169 | Without this option, all server certificate validation errors | |
638402dd | 3170 | terminate the transaction to protect Squid and the client. |
4c9da963 | 3171 | |
0ad3ff51 CT |
3172 | SQUID_X509_V_ERR_INFINITE_VALIDATION error cannot be bypassed |
3173 | but should not happen unless your OpenSSL library is buggy. | |
3174 | ||
638402dd AJ |
3175 | SECURITY WARNING: |
3176 | Bypassing validation errors is dangerous because an | |
3177 | error usually implies that the server cannot be trusted | |
3178 | and the connection may be insecure. | |
4c9da963 | 3179 | |
638402dd | 3180 | See also: sslproxy_flags and DONT_VERIFY_PEER. |
4c9da963 | 3181 | DOC_END |
3182 | ||
aebe6888 | 3183 | NAME: sslproxy_cert_sign |
cb4f4424 | 3184 | IFDEF: USE_OPENSSL |
aebe6888 | 3185 | DEFAULT: none |
10d914f6 CT |
3186 | POSTSCRIPTUM: signUntrusted ssl::certUntrusted |
3187 | POSTSCRIPTUM: signSelf ssl::certSelfSigned | |
3188 | POSTSCRIPTUM: signTrusted all | |
aebe6888 CT |
3189 | TYPE: sslproxy_cert_sign |
3190 | LOC: Config.ssl_client.cert_sign | |
3191 | DOC_START | |
3192 | ||
69742b76 | 3193 | sslproxy_cert_sign <signing algorithm> acl ... |
aebe6888 | 3194 | |
69742b76 | 3195 | The following certificate signing algorithms are supported: |
638402dd | 3196 | |
aebe6888 | 3197 | signTrusted |
69742b76 AR |
3198 | Sign using the configured CA certificate which is usually |
3199 | placed in and trusted by end-user browsers. This is the | |
3200 | default for trusted origin server certificates. | |
638402dd | 3201 | |
aebe6888 | 3202 | signUntrusted |
69742b76 AR |
3203 | Sign to guarantee an X509_V_ERR_CERT_UNTRUSTED browser error. |
3204 | This is the default for untrusted origin server certificates | |
3205 | that are not self-signed (see ssl::certUntrusted). | |
638402dd | 3206 | |
aebe6888 | 3207 | signSelf |
69742b76 | 3208 | Sign using a self-signed certificate with the right CN to |
aebe6888 | 3209 | generate a X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT error in the |
69742b76 AR |
3210 | browser. This is the default for self-signed origin server |
3211 | certificates (see ssl::certSelfSigned). | |
aebe6888 | 3212 | |
cf1c09f6 CT |
3213 | This clause only supports fast acl types. |
3214 | ||
69742b76 AR |
3215 | When sslproxy_cert_sign acl(s) match, Squid uses the corresponding |
3216 | signing algorithm to generate the certificate and ignores all | |
3217 | subsequent sslproxy_cert_sign options (the first match wins). If no | |
3218 | acl(s) match, the default signing algorithm is determined by errors | |
3219 | detected when obtaining and validating the origin server certificate. | |
cf1c09f6 | 3220 | |
4b0d23b7 CT |
3221 | WARNING: SQUID_X509_V_ERR_DOMAIN_MISMATCH and ssl:certDomainMismatch can |
3222 | be used with sslproxy_cert_adapt, but if and only if Squid is bumping a | |
3223 | CONNECT request that carries a domain name. In all other cases (CONNECT | |
3224 | to an IP address or an intercepted SSL connection), Squid cannot detect | |
3225 | the domain mismatch at certificate generation time when | |
3226 | bump-server-first is used. | |
aebe6888 CT |
3227 | DOC_END |
3228 | ||
638402dd | 3229 | NAME: sslproxy_cert_adapt |
cb4f4424 | 3230 | IFDEF: USE_OPENSSL |
fb2178bb CT |
3231 | DEFAULT: none |
3232 | TYPE: sslproxy_cert_adapt | |
3233 | LOC: Config.ssl_client.cert_adapt | |
3234 | DOC_START | |
3235 | ||
3236 | sslproxy_cert_adapt <adaptation algorithm> acl ... | |
3237 | ||
69742b76 | 3238 | The following certificate adaptation algorithms are supported: |
638402dd | 3239 | |
fb2178bb | 3240 | setValidAfter |
69742b76 AR |
3241 | Sets the "Not After" property to the "Not After" property of |
3242 | the CA certificate used to sign generated certificates. | |
638402dd | 3243 | |
fb2178bb | 3244 | setValidBefore |
69742b76 AR |
3245 | Sets the "Not Before" property to the "Not Before" property of |
3246 | the CA certificate used to sign generated certificates. | |
638402dd | 3247 | |
69742b76 AR |
3248 | setCommonName or setCommonName{CN} |
3249 | Sets Subject.CN property to the host name specified as a | |
3250 | CN parameter or, if no explicit CN parameter was specified, | |
3251 | extracted from the CONNECT request. It is a misconfiguration | |
3252 | to use setCommonName without an explicit parameter for | |
3253 | intercepted or tproxied SSL connections. | |
fb2178bb | 3254 | |
cf1c09f6 CT |
3255 | This clause only supports fast acl types. |
3256 | ||
69742b76 AR |
3257 | Squid first groups sslproxy_cert_adapt options by adaptation algorithm. |
3258 | Within a group, when sslproxy_cert_adapt acl(s) match, Squid uses the | |
3259 | corresponding adaptation algorithm to generate the certificate and | |
3260 | ignores all subsequent sslproxy_cert_adapt options in that algorithm's | |
3261 | group (i.e., the first match wins within each algorithm group). If no | |
3262 | acl(s) match, the default mimicking action takes place. | |
cf1c09f6 | 3263 | |
4b0d23b7 CT |
3264 | WARNING: SQUID_X509_V_ERR_DOMAIN_MISMATCH and ssl:certDomainMismatch can |
3265 | be used with sslproxy_cert_adapt, but if and only if Squid is bumping a | |
3266 | CONNECT request that carries a domain name. In all other cases (CONNECT | |
3267 | to an IP address or an intercepted SSL connection), Squid cannot detect | |
3268 | the domain mismatch at certificate generation time when | |
3269 | bump-server-first is used. | |
fb2178bb CT |
3270 | DOC_END |
3271 | ||
41bd17a4 | 3272 | NAME: sslpassword_program |
cb4f4424 | 3273 | IFDEF: USE_OPENSSL |
41bd17a4 | 3274 | DEFAULT: none |
3275 | LOC: Config.Program.ssl_password | |
3276 | TYPE: string | |
5473c134 | 3277 | DOC_START |
41bd17a4 | 3278 | Specify a program used for entering SSL key passphrases |
3279 | when using encrypted SSL certificate keys. If not specified | |
3280 | keys must either be unencrypted, or Squid started with the -N | |
3281 | option to allow it to query interactively for the passphrase. | |
7acb9ddd HN |
3282 | |
3283 | The key file name is given as argument to the program allowing | |
3284 | selection of the right password if you have multiple encrypted | |
3285 | keys. | |
5473c134 | 3286 | DOC_END |
3287 | ||
95d2589c CT |
3288 | COMMENT_START |
3289 | OPTIONS RELATING TO EXTERNAL SSL_CRTD | |
3290 | ----------------------------------------------------------------------------- | |
3291 | COMMENT_END | |
3292 | ||
3293 | NAME: sslcrtd_program | |
3294 | TYPE: eol | |
3295 | IFDEF: USE_SSL_CRTD | |
3296 | DEFAULT: @DEFAULT_SSL_CRTD@ -s @DEFAULT_SSL_DB_DIR@ -M 4MB | |
3297 | LOC: Ssl::TheConfig.ssl_crtd | |
3298 | DOC_START | |
cb0b3d63 AJ |
3299 | Specify the location and options of the executable for certificate |
3300 | generator. | |
a2a12dec MM |
3301 | |
3302 | @DEFAULT_SSL_CRTD@ program can use a disk cache to improve response | |
3303 | times on repeated requests. To enable caching, specify -s and -M | |
3304 | parameters. If those parameters are not given, the program generates | |
3305 | a new certificate on every request. | |
3306 | ||
95d2589c CT |
3307 | For more information use: |
3308 | @DEFAULT_SSL_CRTD@ -h | |
3309 | DOC_END | |
3310 | ||
3311 | NAME: sslcrtd_children | |
3312 | TYPE: HelperChildConfig | |
3313 | IFDEF: USE_SSL_CRTD | |
3314 | DEFAULT: 32 startup=5 idle=1 | |
3315 | LOC: Ssl::TheConfig.ssl_crtdChildren | |
3316 | DOC_START | |
79933cd6 AR |
3317 | Specifies the maximum number of certificate generation processes that |
3318 | Squid may spawn (numberofchildren) and several related options. Using | |
3319 | too few of these helper processes (a.k.a. "helpers") creates request | |
3320 | queues. Using too many helpers wastes your system resources. Squid | |
3321 | does not support spawning more than 32 helpers. | |
3322 | ||
3323 | Usage: numberofchildren [option]... | |
3324 | ||
95d2589c CT |
3325 | The startup= and idle= options allow some measure of skew in your |
3326 | tuning. | |
3327 | ||
3328 | startup=N | |
3329 | ||
3330 | Sets the minimum number of processes to spawn when Squid | |
3331 | starts or reconfigures. When set to zero the first request will | |
3332 | cause spawning of the first child process to handle it. | |
3333 | ||
3334 | Starting too few children temporary slows Squid under load while it | |
3335 | tries to spawn enough additional processes to cope with traffic. | |
3336 | ||
3337 | idle=N | |
3338 | ||
3339 | Sets a minimum of how many processes Squid is to try and keep available | |
3340 | at all times. When traffic begins to rise above what the existing | |
3341 | processes can handle this many more will be spawned up to the maximum | |
3342 | configured. A minimum setting of 1 is required. | |
6825b101 CT |
3343 | |
3344 | queue-size=N | |
3345 | ||
79933cd6 AR |
3346 | Sets the maximum number of queued requests. A request is queued when |
3347 | no existing child is idle and no new child can be started due to | |
3348 | numberofchildren limit. If the queued requests exceed queue size for | |
3349 | more than 3 minutes squid aborts its operation. The default value is | |
3350 | set to 2*numberofchildren. | |
95d2589c CT |
3351 | |
3352 | You must have at least one ssl_crtd process. | |
3353 | DOC_END | |
3354 | ||
2cef0ca6 AR |
3355 | NAME: sslcrtvalidator_program |
3356 | TYPE: eol | |
cb4f4424 | 3357 | IFDEF: USE_OPENSSL |
2cef0ca6 AR |
3358 | DEFAULT: none |
3359 | LOC: Ssl::TheConfig.ssl_crt_validator | |
3360 | DOC_START | |
3361 | Specify the location and options of the executable for ssl_crt_validator | |
638402dd AJ |
3362 | process. |
3363 | ||
3364 | Usage: sslcrtvalidator_program [ttl=n] [cache=n] path ... | |
14798e73 CT |
3365 | |
3366 | Options: | |
638402dd | 3367 | ttl=n TTL in seconds for cached results. The default is 60 secs |
14798e73 | 3368 | cache=n limit the result cache size. The default value is 2048 |
2cef0ca6 AR |
3369 | DOC_END |
3370 | ||
3371 | NAME: sslcrtvalidator_children | |
3372 | TYPE: HelperChildConfig | |
cb4f4424 | 3373 | IFDEF: USE_OPENSSL |
413bb969 | 3374 | DEFAULT: 32 startup=5 idle=1 concurrency=1 |
2cef0ca6 AR |
3375 | LOC: Ssl::TheConfig.ssl_crt_validator_Children |
3376 | DOC_START | |
79933cd6 AR |
3377 | Specifies the maximum number of certificate validation processes that |
3378 | Squid may spawn (numberofchildren) and several related options. Using | |
3379 | too few of these helper processes (a.k.a. "helpers") creates request | |
3380 | queues. Using too many helpers wastes your system resources. Squid | |
3381 | does not support spawning more than 32 helpers. | |
3382 | ||
3383 | Usage: numberofchildren [option]... | |
2cef0ca6 AR |
3384 | |
3385 | The startup= and idle= options allow some measure of skew in your | |
3386 | tuning. | |
3387 | ||
3388 | startup=N | |
3389 | ||
3390 | Sets the minimum number of processes to spawn when Squid | |
3391 | starts or reconfigures. When set to zero the first request will | |
3392 | cause spawning of the first child process to handle it. | |
3393 | ||
3394 | Starting too few children temporary slows Squid under load while it | |
3395 | tries to spawn enough additional processes to cope with traffic. | |
3396 | ||
3397 | idle=N | |
3398 | ||
3399 | Sets a minimum of how many processes Squid is to try and keep available | |
3400 | at all times. When traffic begins to rise above what the existing | |
3401 | processes can handle this many more will be spawned up to the maximum | |
3402 | configured. A minimum setting of 1 is required. | |
4a77bb4e CT |
3403 | |
3404 | concurrency= | |
3405 | ||
3406 | The number of requests each certificate validator helper can handle in | |
dffc462a CT |
3407 | parallel. A value of 0 indicates the certficate validator does not |
3408 | support concurrency. Defaults to 1. | |
4a77bb4e CT |
3409 | |
3410 | When this directive is set to a value >= 1 then the protocol | |
3411 | used to communicate with the helper is modified to include | |
3412 | a request ID in front of the request/response. The request | |
3413 | ID from the request must be echoed back with the response | |
3414 | to that request. | |
6825b101 CT |
3415 | |
3416 | queue-size=N | |
3417 | ||
79933cd6 AR |
3418 | Sets the maximum number of queued requests. A request is queued when |
3419 | no existing child can accept it due to concurrency limit and no new | |
3420 | child can be started due to numberofchildren limit. If the queued | |
3421 | requests exceed queue size for more than 3 minutes squid aborts its | |
3422 | operation. The default value is set to 2*numberofchildren. | |
2cef0ca6 AR |
3423 | |
3424 | You must have at least one ssl_crt_validator process. | |
3425 | DOC_END | |
3426 | ||
cccac0a2 | 3427 | COMMENT_START |
41bd17a4 | 3428 | OPTIONS WHICH AFFECT THE NEIGHBOR SELECTION ALGORITHM |
cccac0a2 | 3429 | ----------------------------------------------------------------------------- |
3430 | COMMENT_END | |
3431 | ||
41bd17a4 | 3432 | NAME: cache_peer |
3433 | TYPE: peer | |
3434 | DEFAULT: none | |
3435 | LOC: Config.peers | |
cccac0a2 | 3436 | DOC_START |
41bd17a4 | 3437 | To specify other caches in a hierarchy, use the format: |
2b94f655 | 3438 | |
41bd17a4 | 3439 | cache_peer hostname type http-port icp-port [options] |
2b94f655 | 3440 | |
41bd17a4 | 3441 | For example, |
2b94f655 | 3442 | |
41bd17a4 | 3443 | # proxy icp |
3444 | # hostname type port port options | |
3445 | # -------------------- -------- ----- ----- ----------- | |
2b94f655 | 3446 | cache_peer parent.foo.net parent 3128 3130 default |
41bd17a4 | 3447 | cache_peer sib1.foo.net sibling 3128 3130 proxy-only |
3448 | cache_peer sib2.foo.net sibling 3128 3130 proxy-only | |
2e9993e1 | 3449 | cache_peer example.com parent 80 0 default |
2b94f655 AJ |
3450 | cache_peer cdn.example.com sibling 3128 0 |
3451 | ||
3452 | type: either 'parent', 'sibling', or 'multicast'. | |
3453 | ||
3454 | proxy-port: The port number where the peer accept HTTP requests. | |
3455 | For other Squid proxies this is usually 3128 | |
3456 | For web servers this is usually 80 | |
3457 | ||
3458 | icp-port: Used for querying neighbor caches about objects. | |
3459 | Set to 0 if the peer does not support ICP or HTCP. | |
3460 | See ICP and HTCP options below for additional details. | |
3461 | ||
3462 | ||
3463 | ==== ICP OPTIONS ==== | |
3464 | ||
3465 | You MUST also set icp_port and icp_access explicitly when using these options. | |
3466 | The defaults will prevent peer traffic using ICP. | |
3467 | ||
3468 | ||
3469 | no-query Disable ICP queries to this neighbor. | |
3470 | ||
3471 | multicast-responder | |
3472 | Indicates the named peer is a member of a multicast group. | |
3473 | ICP queries will not be sent directly to the peer, but ICP | |
3474 | replies will be accepted from it. | |
3475 | ||
3476 | closest-only Indicates that, for ICP_OP_MISS replies, we'll only forward | |
3477 | CLOSEST_PARENT_MISSes and never FIRST_PARENT_MISSes. | |
3478 | ||
3479 | background-ping | |
3480 | To only send ICP queries to this neighbor infrequently. | |
3481 | This is used to keep the neighbor round trip time updated | |
3482 | and is usually used in conjunction with weighted-round-robin. | |
3483 | ||
3484 | ||
3485 | ==== HTCP OPTIONS ==== | |
3486 | ||
3487 | You MUST also set htcp_port and htcp_access explicitly when using these options. | |
3488 | The defaults will prevent peer traffic using HTCP. | |
3489 | ||
3490 | ||
3491 | htcp Send HTCP, instead of ICP, queries to the neighbor. | |
3492 | You probably also want to set the "icp-port" to 4827 | |
18191440 AJ |
3493 | instead of 3130. This directive accepts a comma separated |
3494 | list of options described below. | |
2b94f655 | 3495 | |
18191440 | 3496 | htcp=oldsquid Send HTCP to old Squid versions (2.5 or earlier). |
2b94f655 | 3497 | |
18191440 | 3498 | htcp=no-clr Send HTCP to the neighbor but without |
2b94f655 | 3499 | sending any CLR requests. This cannot be used with |
18191440 | 3500 | only-clr. |
2b94f655 | 3501 | |
18191440 AJ |
3502 | htcp=only-clr Send HTCP to the neighbor but ONLY CLR requests. |
3503 | This cannot be used with no-clr. | |
2b94f655 | 3504 | |
18191440 | 3505 | htcp=no-purge-clr |
2b94f655 AJ |
3506 | Send HTCP to the neighbor including CLRs but only when |
3507 | they do not result from PURGE requests. | |
3508 | ||
18191440 | 3509 | htcp=forward-clr |
2b94f655 AJ |
3510 | Forward any HTCP CLR requests this proxy receives to the peer. |
3511 | ||
3512 | ||
3513 | ==== PEER SELECTION METHODS ==== | |
3514 | ||
3515 | The default peer selection method is ICP, with the first responding peer | |
3516 | being used as source. These options can be used for better load balancing. | |
3517 | ||
3518 | ||
3519 | default This is a parent cache which can be used as a "last-resort" | |
3520 | if a peer cannot be located by any of the peer-selection methods. | |
3521 | If specified more than once, only the first is used. | |
3522 | ||
3523 | round-robin Load-Balance parents which should be used in a round-robin | |
3524 | fashion in the absence of any ICP queries. | |
3525 | weight=N can be used to add bias. | |
3526 | ||
3527 | weighted-round-robin | |
3528 | Load-Balance parents which should be used in a round-robin | |
3529 | fashion with the frequency of each parent being based on the | |
3530 | round trip time. Closer parents are used more often. | |
3531 | Usually used for background-ping parents. | |
3532 | weight=N can be used to add bias. | |
3533 | ||
3534 | carp Load-Balance parents which should be used as a CARP array. | |
3535 | The requests will be distributed among the parents based on the | |
3536 | CARP load balancing hash function based on their weight. | |
3537 | ||
3538 | userhash Load-balance parents based on the client proxy_auth or ident username. | |
3539 | ||
3540 | sourcehash Load-balance parents based on the client source IP. | |
8a368316 AJ |
3541 | |
3542 | multicast-siblings | |
3543 | To be used only for cache peers of type "multicast". | |
3544 | ALL members of this multicast group have "sibling" | |
2e9993e1 | 3545 | relationship with it, not "parent". This is to a multicast |
8a368316 AJ |
3546 | group when the requested object would be fetched only from |
3547 | a "parent" cache, anyway. It's useful, e.g., when | |
3548 | configuring a pool of redundant Squid proxies, being | |
3549 | members of the same multicast group. | |
2b94f655 AJ |
3550 | |
3551 | ||
3552 | ==== PEER SELECTION OPTIONS ==== | |
3553 | ||
3554 | weight=N use to affect the selection of a peer during any weighted | |
3555 | peer-selection mechanisms. | |
3556 | The weight must be an integer; default is 1, | |
3557 | larger weights are favored more. | |
3558 | This option does not affect parent selection if a peering | |
3559 | protocol is not in use. | |
3560 | ||
3561 | basetime=N Specify a base amount to be subtracted from round trip | |
3562 | times of parents. | |
3563 | It is subtracted before division by weight in calculating | |
3564 | which parent to fectch from. If the rtt is less than the | |
3565 | base time the rtt is set to a minimal value. | |
3566 | ||
3c72389f AJ |
3567 | ttl=N Specify a TTL to use when sending multicast ICP queries |
3568 | to this address. | |
2b94f655 AJ |
3569 | Only useful when sending to a multicast group. |
3570 | Because we don't accept ICP replies from random | |
3571 | hosts, you must configure other group members as | |
3572 | peers with the 'multicast-responder' option. | |
3573 | ||
3574 | no-delay To prevent access to this neighbor from influencing the | |
3575 | delay pools. | |
3576 | ||
3577 | digest-url=URL Tell Squid to fetch the cache digest (if digests are | |
3578 | enabled) for this host from the specified URL rather | |
3579 | than the Squid default location. | |
3580 | ||
3581 | ||
de03b596 FC |
3582 | ==== CARP OPTIONS ==== |
3583 | ||
3584 | carp-key=key-specification | |
3585 | use a different key than the full URL to hash against the peer. | |
3586 | the key-specification is a comma-separated list of the keywords | |
3587 | scheme, host, port, path, params | |
3588 | Order is not important. | |
3589 | ||
2b94f655 AJ |
3590 | ==== ACCELERATOR / REVERSE-PROXY OPTIONS ==== |
3591 | ||
3592 | originserver Causes this parent to be contacted as an origin server. | |
3593 | Meant to be used in accelerator setups when the peer | |
3594 | is a web server. | |
3595 | ||
3596 | forceddomain=name | |
3597 | Set the Host header of requests forwarded to this peer. | |
3598 | Useful in accelerator setups where the server (peer) | |
3599 | expects a certain domain name but clients may request | |
3600 | others. ie example.com or www.example.com | |
3601 | ||
3602 | no-digest Disable request of cache digests. | |
3603 | ||
3604 | no-netdb-exchange | |
3605 | Disables requesting ICMP RTT database (NetDB). | |
3606 | ||
3607 | ||
3608 | ==== AUTHENTICATION OPTIONS ==== | |
3609 | ||
3610 | login=user:password | |
3611 | If this is a personal/workgroup proxy and your parent | |
3612 | requires proxy authentication. | |
3613 | ||
3614 | Note: The string can include URL escapes (i.e. %20 for | |
3615 | spaces). This also means % must be written as %%. | |
3616 | ||
11e4c5e5 AJ |
3617 | login=PASSTHRU |
3618 | Send login details received from client to this peer. | |
3619 | Both Proxy- and WWW-Authorization headers are passed | |
3620 | without alteration to the peer. | |
3621 | Authentication is not required by Squid for this to work. | |
3622 | ||
3623 | Note: This will pass any form of authentication but | |
3624 | only Basic auth will work through a proxy unless the | |
3625 | connection-auth options are also used. | |
ee0b94f4 | 3626 | |
2b94f655 AJ |
3627 | login=PASS Send login details received from client to this peer. |
3628 | Authentication is not required by this option. | |
11e4c5e5 | 3629 | |
2b94f655 AJ |
3630 | If there are no client-provided authentication headers |
3631 | to pass on, but username and password are available | |
ee0b94f4 HN |
3632 | from an external ACL user= and password= result tags |
3633 | they may be sent instead. | |
2b94f655 AJ |
3634 | |
3635 | Note: To combine this with proxy_auth both proxies must | |
3636 | share the same user database as HTTP only allows for | |
3637 | a single login (one for proxy, one for origin server). | |
3638 | Also be warned this will expose your users proxy | |
3639 | password to the peer. USE WITH CAUTION | |
3640 | ||
3641 | login=*:password | |
3642 | Send the username to the upstream cache, but with a | |
3643 | fixed password. This is meant to be used when the peer | |
3644 | is in another administrative domain, but it is still | |
3645 | needed to identify each user. | |
3646 | The star can optionally be followed by some extra | |
3647 | information which is added to the username. This can | |
3648 | be used to identify this proxy to the peer, similar to | |
3649 | the login=username:password option above. | |
3650 | ||
9ca29d23 AJ |
3651 | login=NEGOTIATE |
3652 | If this is a personal/workgroup proxy and your parent | |
3653 | requires a secure proxy authentication. | |
3654 | The first principal from the default keytab or defined by | |
3655 | the environment variable KRB5_KTNAME will be used. | |
3656 | ||
63f03f79 PL |
3657 | WARNING: The connection may transmit requests from multiple |
3658 | clients. Negotiate often assumes end-to-end authentication | |
3659 | and a single-client. Which is not strictly true here. | |
3660 | ||
9ca29d23 AJ |
3661 | login=NEGOTIATE:principal_name |
3662 | If this is a personal/workgroup proxy and your parent | |
3663 | requires a secure proxy authentication. | |
3664 | The principal principal_name from the default keytab or | |
3665 | defined by the environment variable KRB5_KTNAME will be | |
3666 | used. | |
3667 | ||
63f03f79 PL |
3668 | WARNING: The connection may transmit requests from multiple |
3669 | clients. Negotiate often assumes end-to-end authentication | |
3670 | and a single-client. Which is not strictly true here. | |
3671 | ||
2b94f655 AJ |
3672 | connection-auth=on|off |
3673 | Tell Squid that this peer does or not support Microsoft | |
3674 | connection oriented authentication, and any such | |
3675 | challenges received from there should be ignored. | |
3676 | Default is auto to automatically determine the status | |
3677 | of the peer. | |
3678 | ||
9825b398 AJ |
3679 | auth-no-keytab |
3680 | Do not use a keytab to authenticate to a peer when | |
3681 | login=NEGOTIATE is specified. Let the GSSAPI | |
3682 | implementation determine which already existing | |
3683 | credentials cache to use instead. | |
3684 | ||
2b94f655 AJ |
3685 | |
3686 | ==== SSL / HTTPS / TLS OPTIONS ==== | |
3687 | ||
0ff7e52d | 3688 | tls Encrypt connections to this peer with TLS. |
2b94f655 AJ |
3689 | |
3690 | sslcert=/path/to/ssl/certificate | |
51e09c08 | 3691 | A client X.509 certificate to use when connecting to |
2b94f655 AJ |
3692 | this peer. |
3693 | ||
3694 | sslkey=/path/to/ssl/key | |
51e09c08 AJ |
3695 | The private key corresponding to sslcert above. |
3696 | ||
3697 | If sslkey= is not specified sslcert= is assumed to | |
3698 | reference a PEM file containing both the certificate | |
3699 | and private key. | |
2b94f655 | 3700 | |
2b94f655 AJ |
3701 | sslcipher=... The list of valid SSL ciphers to use when connecting |
3702 | to this peer. | |
1cc44095 AJ |
3703 | |
3704 | tls-min-version=1.N | |
3705 | The minimum TLS protocol version to permit. To control | |
3f5b28fe | 3706 | SSLv3 use the tls-options= parameter. |
1cc44095 AJ |
3707 | Supported Values: 1.0 (default), 1.1, 1.2 |
3708 | ||
3f5b28fe | 3709 | tls-options=... Specify various TLS implementation options. |
943c5f16 | 3710 | |
3f5b28fe | 3711 | OpenSSL options most important are: |
1f1f29e8 | 3712 | |
3f5b28fe | 3713 | NO_SSLv3 Disallow the use of SSLv3 |
1f1f29e8 | 3714 | |
943c5f16 HN |
3715 | SINGLE_DH_USE |
3716 | Always create a new key when using | |
3717 | temporary/ephemeral DH key exchanges | |
1f1f29e8 | 3718 | |
ce0adf1a | 3719 | NO_TICKET |
1f1f29e8 AJ |
3720 | Disable use of RFC5077 session tickets. |
3721 | Some servers may have problems | |
3722 | understanding the TLS extension due | |
3723 | to ambiguous specification in RFC4507. | |
3724 | ||
943c5f16 HN |
3725 | ALL Enable various bug workarounds |
3726 | suggested as "harmless" by OpenSSL | |
3727 | Be warned that this reduces SSL/TLS | |
3728 | strength to some attacks. | |
3729 | ||
3730 | See the OpenSSL SSL_CTX_set_options documentation for a | |
3731 | more complete list. | |
3f5b28fe AJ |
3732 | |
3733 | GnuTLS options most important are: | |
3734 | ||
3735 | %NO_TICKETS | |
3736 | Disable use of RFC5077 session tickets. | |
3737 | Some servers may have problems | |
3738 | understanding the TLS extension due | |
3739 | to ambiguous specification in RFC4507. | |
3740 | ||
3741 | See the GnuTLS Priority Strings documentation | |
3742 | for a more complete list. | |
3743 | http://www.gnutls.org/manual/gnutls.html#Priority-Strings | |
3744 | ||
86a84cc0 AJ |
3745 | tls-cafile= PEM file containing CA certificates to use when verifying |
3746 | the peer certificate. May be repeated to load multiple files. | |
2b94f655 AJ |
3747 | |
3748 | sslcapath=... A directory containing additional CA certificates to | |
3749 | use when verifying the peer certificate. | |
86a84cc0 | 3750 | Requires OpenSSL or LibreSSL. |
2b94f655 AJ |
3751 | |
3752 | sslcrlfile=... A certificate revocation list file to use when | |
3753 | verifying the peer certificate. | |
3754 | ||
3755 | sslflags=... Specify various flags modifying the SSL implementation: | |
3756 | ||
41bd17a4 | 3757 | DONT_VERIFY_PEER |
3758 | Accept certificates even if they fail to | |
3759 | verify. | |
1f1f29e8 | 3760 | |
41bd17a4 | 3761 | DONT_VERIFY_DOMAIN |
3762 | Don't verify the peer certificate | |
3763 | matches the server name | |
2b94f655 AJ |
3764 | |
3765 | ssldomain= The peer name as advertised in it's certificate. | |
3766 | Used for verifying the correctness of the received peer | |
3767 | certificate. If not specified the peer hostname will be | |
3768 | used. | |
3769 | ||
bad9c5e4 | 3770 | front-end-https[=off|on|auto] |
2b94f655 AJ |
3771 | Enable the "Front-End-Https: On" header needed when |
3772 | using Squid as a SSL frontend in front of Microsoft OWA. | |
3773 | See MS KB document Q307347 for details on this header. | |
3774 | If set to auto the header will only be added if the | |
3775 | request is forwarded as a https:// URL. | |
435c72b0 AJ |
3776 | |
3777 | tls-default-ca[=off] | |
3778 | Whether to use the system Trusted CAs. Default is ON. | |
2b94f655 | 3779 | |
b05d749d AJ |
3780 | tls-no-npn Do not use the TLS NPN extension to advertise HTTP/1.1. |
3781 | ||
2b94f655 AJ |
3782 | ==== GENERAL OPTIONS ==== |
3783 | ||
3784 | connect-timeout=N | |
3785 | A peer-specific connect timeout. | |
3786 | Also see the peer_connect_timeout directive. | |
3787 | ||
3788 | connect-fail-limit=N | |
3789 | How many times connecting to a peer must fail before | |
e8dca475 CT |
3790 | it is marked as down. Standby connection failures |
3791 | count towards this limit. Default is 10. | |
2b94f655 AJ |
3792 | |
3793 | allow-miss Disable Squid's use of only-if-cached when forwarding | |
3794 | requests to siblings. This is primarily useful when | |
a5bb0c26 AR |
3795 | icp_hit_stale is used by the sibling. Excessive use |
3796 | of this option may result in forwarding loops. One way | |
3797 | to prevent peering loops when using this option, is to | |
3798 | deny cache peer usage on requests from a peer: | |
3799 | acl fromPeer ... | |
3800 | cache_peer_access peerName deny fromPeer | |
2b94f655 | 3801 | |
e8dca475 CT |
3802 | max-conn=N Limit the number of concurrent connections the Squid |
3803 | may open to this peer, including already opened idle | |
3804 | and standby connections. There is no peer-specific | |
3805 | connection limit by default. | |
3806 | ||
3807 | A peer exceeding the limit is not used for new | |
3808 | requests unless a standby connection is available. | |
3809 | ||
3810 | max-conn currently works poorly with idle persistent | |
3811 | connections: When a peer reaches its max-conn limit, | |
3812 | and there are idle persistent connections to the peer, | |
3813 | the peer may not be selected because the limiting code | |
3814 | does not know whether Squid can reuse those idle | |
3815 | connections. | |
3816 | ||
3817 | standby=N Maintain a pool of N "hot standby" connections to an | |
3818 | UP peer, available for requests when no idle | |
3819 | persistent connection is available (or safe) to use. | |
3820 | By default and with zero N, no such pool is maintained. | |
3821 | N must not exceed the max-conn limit (if any). | |
3822 | ||
3823 | At start or after reconfiguration, Squid opens new TCP | |
3824 | standby connections until there are N connections | |
3825 | available and then replenishes the standby pool as | |
3826 | opened connections are used up for requests. A used | |
3827 | connection never goes back to the standby pool, but | |
3828 | may go to the regular idle persistent connection pool | |
3829 | shared by all peers and origin servers. | |
3830 | ||
3831 | Squid never opens multiple new standby connections | |
3832 | concurrently. This one-at-a-time approach minimizes | |
3833 | flooding-like effect on peers. Furthermore, just a few | |
3834 | standby connections should be sufficient in most cases | |
3835 | to supply most new requests with a ready-to-use | |
3836 | connection. | |
3837 | ||
3838 | Standby connections obey server_idle_pconn_timeout. | |
3839 | For the feature to work as intended, the peer must be | |
3840 | configured to accept and keep them open longer than | |
3841 | the idle timeout at the connecting Squid, to minimize | |
3842 | race conditions typical to idle used persistent | |
3843 | connections. Default request_timeout and | |
3844 | server_idle_pconn_timeout values ensure such a | |
3845 | configuration. | |
2b94f655 AJ |
3846 | |
3847 | name=xxx Unique name for the peer. | |
3848 | Required if you have multiple peers on the same host | |
3849 | but different ports. | |
3850 | This name can be used in cache_peer_access and similar | |
a5bb0c26 | 3851 | directives to identify the peer. |
2b94f655 AJ |
3852 | Can be used by outgoing access controls through the |
3853 | peername ACL type. | |
3854 | ||
b0758e04 AJ |
3855 | no-tproxy Do not use the client-spoof TPROXY support when forwarding |
3856 | requests to this peer. Use normal address selection instead. | |
0d901ef4 | 3857 | This overrides the spoof_client_ip ACL. |
b0758e04 | 3858 | |
2b94f655 AJ |
3859 | proxy-only objects fetched from the peer will not be stored locally. |
3860 | ||
41bd17a4 | 3861 | DOC_END |
cccac0a2 | 3862 | |
41bd17a4 | 3863 | NAME: cache_peer_access |
3864 | TYPE: peer_access | |
3865 | DEFAULT: none | |
a5bb0c26 | 3866 | DEFAULT_DOC: No peer usage restrictions. |
41bd17a4 | 3867 | LOC: none |
3868 | DOC_START | |
a5bb0c26 | 3869 | Restricts usage of cache_peer proxies. |
cccac0a2 | 3870 | |
638402dd | 3871 | Usage: |
a5bb0c26 AR |
3872 | cache_peer_access peer-name allow|deny [!]aclname ... |
3873 | ||
3874 | For the required peer-name parameter, use either the value of the | |
3875 | cache_peer name=value parameter or, if name=value is missing, the | |
3876 | cache_peer hostname parameter. | |
3877 | ||
3878 | This directive narrows down the selection of peering candidates, but | |
3879 | does not determine the order in which the selected candidates are | |
3880 | contacted. That order is determined by the peer selection algorithms | |
3881 | (see PEER SELECTION sections in the cache_peer documentation). | |
3882 | ||
3883 | If a deny rule matches, the corresponding peer will not be contacted | |
3884 | for the current transaction -- Squid will not send ICP queries and | |
3885 | will not forward HTTP requests to that peer. An allow match leaves | |
3886 | the corresponding peer in the selection. The first match for a given | |
3887 | peer wins for that peer. | |
3888 | ||
3889 | The relative order of cache_peer_access directives for the same peer | |
3890 | matters. The relative order of any two cache_peer_access directives | |
3891 | for different peers does not matter. To ease interpretation, it is a | |
3892 | good idea to group cache_peer_access directives for the same peer | |
3893 | together. | |
3894 | ||
3895 | A single cache_peer_access directive may be evaluated multiple times | |
3896 | for a given transaction because individual peer selection algorithms | |
3897 | may check it independently from each other. These redundant checks | |
3898 | may be optimized away in future Squid versions. | |
3899 | ||
3900 | This clause only supports fast acl types. | |
3901 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
dd9b1776 | 3902 | |
41bd17a4 | 3903 | DOC_END |
dd9b1776 | 3904 | |
41bd17a4 | 3905 | NAME: neighbor_type_domain |
3906 | TYPE: hostdomaintype | |
3907 | DEFAULT: none | |
638402dd | 3908 | DEFAULT_DOC: The peer type from cache_peer directive is used for all requests to that peer. |
41bd17a4 | 3909 | LOC: none |
3910 | DOC_START | |
638402dd AJ |
3911 | Modify the cache_peer neighbor type when passing requests |
3912 | about specific domains to the peer. | |
cccac0a2 | 3913 | |
638402dd AJ |
3914 | Usage: |
3915 | neighbor_type_domain neighbor parent|sibling domain domain ... | |
6bf4f823 | 3916 | |
638402dd AJ |
3917 | For example: |
3918 | cache_peer foo.example.com parent 3128 3130 | |
3919 | neighbor_type_domain foo.example.com sibling .au .de | |
6bf4f823 | 3920 | |
638402dd AJ |
3921 | The above configuration treats all requests to foo.example.com as a |
3922 | parent proxy unless the request is for a .au or .de ccTLD domain name. | |
41bd17a4 | 3923 | DOC_END |
6bf4f823 | 3924 | |
41bd17a4 | 3925 | NAME: dead_peer_timeout |
3926 | COMMENT: (seconds) | |
3927 | DEFAULT: 10 seconds | |
3928 | TYPE: time_t | |
3929 | LOC: Config.Timeout.deadPeer | |
3930 | DOC_START | |
3931 | This controls how long Squid waits to declare a peer cache | |
3932 | as "dead." If there are no ICP replies received in this | |
3933 | amount of time, Squid will declare the peer dead and not | |
3934 | expect to receive any further ICP replies. However, it | |
3935 | continues to send ICP queries, and will mark the peer as | |
3936 | alive upon receipt of the first subsequent ICP reply. | |
699acd19 | 3937 | |
41bd17a4 | 3938 | This timeout also affects when Squid expects to receive ICP |
3939 | replies from peers. If more than 'dead_peer' seconds have | |
3940 | passed since the last ICP reply was received, Squid will not | |
3941 | expect to receive an ICP reply on the next query. Thus, if | |
3942 | your time between requests is greater than this timeout, you | |
3943 | will see a lot of requests sent DIRECT to origin servers | |
3944 | instead of to your parents. | |
3945 | DOC_END | |
cccac0a2 | 3946 | |
437823b4 | 3947 | NAME: forward_max_tries |
6c367206 | 3948 | DEFAULT: 25 |
437823b4 AJ |
3949 | TYPE: int |
3950 | LOC: Config.forward_max_tries | |
3951 | DOC_START | |
3eebd267 EB |
3952 | Limits the number of attempts to forward the request. |
3953 | ||
3954 | For the purpose of this limit, Squid counts all high-level request | |
3955 | forwarding attempts, including any same-destination retries after | |
3956 | certain persistent connection failures and any attempts to use a | |
3957 | different peer. However, low-level connection reopening attempts | |
3958 | (enabled using connect_retries) are not counted. | |
31ef19cd | 3959 | |
3eebd267 | 3960 | See also: forward_timeout and connect_retries. |
437823b4 AJ |
3961 | DOC_END |
3962 | ||
41bd17a4 | 3963 | COMMENT_START |
3964 | MEMORY CACHE OPTIONS | |
3965 | ----------------------------------------------------------------------------- | |
3966 | COMMENT_END | |
3967 | ||
3968 | NAME: cache_mem | |
3969 | COMMENT: (bytes) | |
3970 | TYPE: b_size_t | |
df2eec10 | 3971 | DEFAULT: 256 MB |
41bd17a4 | 3972 | LOC: Config.memMaxSize |
6b698a21 | 3973 | DOC_START |
41bd17a4 | 3974 | NOTE: THIS PARAMETER DOES NOT SPECIFY THE MAXIMUM PROCESS SIZE. |
3975 | IT ONLY PLACES A LIMIT ON HOW MUCH ADDITIONAL MEMORY SQUID WILL | |
3976 | USE AS A MEMORY CACHE OF OBJECTS. SQUID USES MEMORY FOR OTHER | |
3977 | THINGS AS WELL. SEE THE SQUID FAQ SECTION 8 FOR DETAILS. | |
3978 | ||
3979 | 'cache_mem' specifies the ideal amount of memory to be used | |
3980 | for: | |
3981 | * In-Transit objects | |
3982 | * Hot Objects | |
3983 | * Negative-Cached objects | |
3984 | ||
3985 | Data for these objects are stored in 4 KB blocks. This | |
3986 | parameter specifies the ideal upper limit on the total size of | |
3987 | 4 KB blocks allocated. In-Transit objects take the highest | |
3988 | priority. | |
3989 | ||
3990 | In-transit objects have priority over the others. When | |
3991 | additional space is needed for incoming data, negative-cached | |
3992 | and hot objects will be released. In other words, the | |
3993 | negative-cached and hot objects will fill up any unused space | |
3994 | not needed for in-transit objects. | |
3995 | ||
3996 | If circumstances require, this limit will be exceeded. | |
3997 | Specifically, if your incoming request rate requires more than | |
3998 | 'cache_mem' of memory to hold in-transit objects, Squid will | |
3999 | exceed this limit to satisfy the new requests. When the load | |
4000 | decreases, blocks will be freed until the high-water mark is | |
4001 | reached. Thereafter, blocks will be used to store hot | |
4002 | objects. | |
29f35ca5 AR |
4003 | |
4004 | If shared memory caching is enabled, Squid does not use the shared | |
4005 | cache space for in-transit objects, but they still consume as much | |
4006 | local memory as they need. For more details about the shared memory | |
4007 | cache, see memory_cache_shared. | |
6b698a21 | 4008 | DOC_END |
0976f8db | 4009 | |
41bd17a4 | 4010 | NAME: maximum_object_size_in_memory |
4011 | COMMENT: (bytes) | |
4012 | TYPE: b_size_t | |
df2eec10 | 4013 | DEFAULT: 512 KB |
41bd17a4 | 4014 | LOC: Config.Store.maxInMemObjSize |
6b698a21 | 4015 | DOC_START |
41bd17a4 | 4016 | Objects greater than this size will not be attempted to kept in |
4017 | the memory cache. This should be set high enough to keep objects | |
4018 | accessed frequently in memory to improve performance whilst low | |
4019 | enough to keep larger objects from hoarding cache_mem. | |
6b698a21 | 4020 | DOC_END |
0976f8db | 4021 | |
57af1e3f AR |
4022 | NAME: memory_cache_shared |
4023 | COMMENT: on|off | |
4024 | TYPE: YesNoNone | |
4025 | LOC: Config.memShared | |
4026 | DEFAULT: none | |
70f856bc | 4027 | DEFAULT_DOC: "on" where supported if doing memory caching with multiple SMP workers. |
57af1e3f AR |
4028 | DOC_START |
4029 | Controls whether the memory cache is shared among SMP workers. | |
4030 | ||
70f856bc AR |
4031 | The shared memory cache is meant to occupy cache_mem bytes and replace |
4032 | the non-shared memory cache, although some entities may still be | |
4033 | cached locally by workers for now (e.g., internal and in-transit | |
4034 | objects may be served from a local memory cache even if shared memory | |
4035 | caching is enabled). | |
4036 | ||
65b81b27 | 4037 | By default, the memory cache is shared if and only if all of the |
70f856bc AR |
4038 | following conditions are satisfied: Squid runs in SMP mode with |
4039 | multiple workers, cache_mem is positive, and Squid environment | |
4040 | supports required IPC primitives (e.g., POSIX shared memory segments | |
4041 | and GCC-style atomic operations). | |
4042 | ||
4043 | To avoid blocking locks, shared memory uses opportunistic algorithms | |
4044 | that do not guarantee that every cachable entity that could have been | |
4045 | shared among SMP workers will actually be shared. | |
57af1e3f AR |
4046 | DOC_END |
4047 | ||
ea21d497 HN |
4048 | NAME: memory_cache_mode |
4049 | TYPE: memcachemode | |
4050 | LOC: Config | |
4051 | DEFAULT: always | |
638402dd | 4052 | DEFAULT_DOC: Keep the most recently fetched objects in memory |
ff4b33f4 | 4053 | DOC_START |
ea21d497 | 4054 | Controls which objects to keep in the memory cache (cache_mem) |
ff4b33f4 | 4055 | |
ea21d497 HN |
4056 | always Keep most recently fetched objects in memory (default) |
4057 | ||
4058 | disk Only disk cache hits are kept in memory, which means | |
4059 | an object must first be cached on disk and then hit | |
4060 | a second time before cached in memory. | |
4061 | ||
4062 | network Only objects fetched from network is kept in memory | |
ff4b33f4 HN |
4063 | DOC_END |
4064 | ||
41bd17a4 | 4065 | NAME: memory_replacement_policy |
4066 | TYPE: removalpolicy | |
4067 | LOC: Config.memPolicy | |
4068 | DEFAULT: lru | |
6b698a21 | 4069 | DOC_START |
41bd17a4 | 4070 | The memory replacement policy parameter determines which |
4071 | objects are purged from memory when memory space is needed. | |
7f7db318 | 4072 | |
638402dd | 4073 | See cache_replacement_policy for details on algorithms. |
41bd17a4 | 4074 | DOC_END |
6b698a21 | 4075 | |
41bd17a4 | 4076 | COMMENT_START |
4077 | DISK CACHE OPTIONS | |
4078 | ----------------------------------------------------------------------------- | |
4079 | COMMENT_END | |
6b698a21 | 4080 | |
41bd17a4 | 4081 | NAME: cache_replacement_policy |
4082 | TYPE: removalpolicy | |
4083 | LOC: Config.replPolicy | |
4084 | DEFAULT: lru | |
4085 | DOC_START | |
4086 | The cache replacement policy parameter determines which | |
4087 | objects are evicted (replaced) when disk space is needed. | |
6b698a21 | 4088 | |
41bd17a4 | 4089 | lru : Squid's original list based LRU policy |
4090 | heap GDSF : Greedy-Dual Size Frequency | |
4091 | heap LFUDA: Least Frequently Used with Dynamic Aging | |
4092 | heap LRU : LRU policy implemented using a heap | |
6b698a21 | 4093 | |
638402dd | 4094 | Applies to any cache_dir lines listed below this directive. |
7f7db318 | 4095 | |
41bd17a4 | 4096 | The LRU policies keeps recently referenced objects. |
0976f8db | 4097 | |
41bd17a4 | 4098 | The heap GDSF policy optimizes object hit rate by keeping smaller |
4099 | popular objects in cache so it has a better chance of getting a | |
4100 | hit. It achieves a lower byte hit rate than LFUDA though since | |
4101 | it evicts larger (possibly popular) objects. | |
0976f8db | 4102 | |
41bd17a4 | 4103 | The heap LFUDA policy keeps popular objects in cache regardless of |
4104 | their size and thus optimizes byte hit rate at the expense of | |
4105 | hit rate since one large, popular object will prevent many | |
4106 | smaller, slightly less popular objects from being cached. | |
0976f8db | 4107 | |
41bd17a4 | 4108 | Both policies utilize a dynamic aging mechanism that prevents |
4109 | cache pollution that can otherwise occur with frequency-based | |
4110 | replacement policies. | |
7d90757b | 4111 | |
41bd17a4 | 4112 | NOTE: if using the LFUDA replacement policy you should increase |
b51ec8c8 | 4113 | the value of maximum_object_size above its default of 4 MB to |
41bd17a4 | 4114 | to maximize the potential byte hit rate improvement of LFUDA. |
dc1af3cf | 4115 | |
41bd17a4 | 4116 | For more information about the GDSF and LFUDA cache replacement |
4117 | policies see http://www.hpl.hp.com/techreports/1999/HPL-1999-69.html | |
4118 | and http://fog.hpl.external.hp.com/techreports/98/HPL-98-173.html. | |
6b698a21 | 4119 | DOC_END |
0976f8db | 4120 | |
a345387f AJ |
4121 | NAME: minimum_object_size |
4122 | COMMENT: (bytes) | |
4123 | TYPE: b_int64_t | |
4124 | DEFAULT: 0 KB | |
4125 | DEFAULT_DOC: no limit | |
4126 | LOC: Config.Store.minObjectSize | |
4127 | DOC_START | |
4128 | Objects smaller than this size will NOT be saved on disk. The | |
4129 | value is specified in bytes, and the default is 0 KB, which | |
4130 | means all responses can be stored. | |
4131 | DOC_END | |
4132 | ||
4133 | NAME: maximum_object_size | |
4134 | COMMENT: (bytes) | |
4135 | TYPE: b_int64_t | |
4136 | DEFAULT: 4 MB | |
4137 | LOC: Config.Store.maxObjectSize | |
4138 | DOC_START | |
499f852c | 4139 | Set the default value for max-size parameter on any cache_dir. |
a345387f AJ |
4140 | The value is specified in bytes, and the default is 4 MB. |
4141 | ||
4142 | If you wish to get a high BYTES hit ratio, you should probably | |
4143 | increase this (one 32 MB object hit counts for 3200 10KB | |
4144 | hits). | |
4145 | ||
4146 | If you wish to increase hit ratio more than you want to | |
4147 | save bandwidth you should leave this low. | |
4148 | ||
4149 | NOTE: if using the LFUDA replacement policy you should increase | |
4150 | this value to maximize the byte hit rate improvement of LFUDA! | |
4151 | See cache_replacement_policy for a discussion of this policy. | |
4152 | DOC_END | |
4153 | ||
41bd17a4 | 4154 | NAME: cache_dir |
4155 | TYPE: cachedir | |
4156 | DEFAULT: none | |
638402dd | 4157 | DEFAULT_DOC: No disk cache. Store cache ojects only in memory. |
41bd17a4 | 4158 | LOC: Config.cacheSwap |
6b698a21 | 4159 | DOC_START |
638402dd AJ |
4160 | Format: |
4161 | cache_dir Type Directory-Name Fs-specific-data [options] | |
0976f8db | 4162 | |
41bd17a4 | 4163 | You can specify multiple cache_dir lines to spread the |
4164 | cache among different disk partitions. | |
0976f8db | 4165 | |
41bd17a4 | 4166 | Type specifies the kind of storage system to use. Only "ufs" |
4167 | is built by default. To enable any of the other storage systems | |
4168 | see the --enable-storeio configure option. | |
0976f8db | 4169 | |
41bd17a4 | 4170 | 'Directory' is a top-level directory where cache swap |
4171 | files will be stored. If you want to use an entire disk | |
4172 | for caching, this can be the mount-point directory. | |
4173 | The directory must exist and be writable by the Squid | |
4174 | process. Squid will NOT create this directory for you. | |
0976f8db | 4175 | |
acf69d74 AJ |
4176 | In SMP configurations, cache_dir must not precede the workers option |
4177 | and should use configuration macros or conditionals to give each | |
4178 | worker interested in disk caching a dedicated cache directory. | |
4179 | ||
638402dd AJ |
4180 | |
4181 | ==== The ufs store type ==== | |
0976f8db | 4182 | |
41bd17a4 | 4183 | "ufs" is the old well-known Squid storage format that has always |
4184 | been there. | |
0976f8db | 4185 | |
638402dd AJ |
4186 | Usage: |
4187 | cache_dir ufs Directory-Name Mbytes L1 L2 [options] | |
0976f8db | 4188 | |
41bd17a4 | 4189 | 'Mbytes' is the amount of disk space (MB) to use under this |
4190 | directory. The default is 100 MB. Change this to suit your | |
4191 | configuration. Do NOT put the size of your disk drive here. | |
4192 | Instead, if you want Squid to use the entire disk drive, | |
4193 | subtract 20% and use that value. | |
0976f8db | 4194 | |
56fba4d0 | 4195 | 'L1' is the number of first-level subdirectories which |
41bd17a4 | 4196 | will be created under the 'Directory'. The default is 16. |
0976f8db | 4197 | |
56fba4d0 | 4198 | 'L2' is the number of second-level subdirectories which |
41bd17a4 | 4199 | will be created under each first-level directory. The default |
4200 | is 256. | |
0976f8db | 4201 | |
638402dd AJ |
4202 | |
4203 | ==== The aufs store type ==== | |
7f7db318 | 4204 | |
41bd17a4 | 4205 | "aufs" uses the same storage format as "ufs", utilizing |
4206 | POSIX-threads to avoid blocking the main Squid process on | |
4207 | disk-I/O. This was formerly known in Squid as async-io. | |
38f9c547 | 4208 | |
638402dd AJ |
4209 | Usage: |
4210 | cache_dir aufs Directory-Name Mbytes L1 L2 [options] | |
38f9c547 | 4211 | |
41bd17a4 | 4212 | see argument descriptions under ufs above |
38f9c547 | 4213 | |
638402dd AJ |
4214 | |
4215 | ==== The diskd store type ==== | |
38f9c547 | 4216 | |
41bd17a4 | 4217 | "diskd" uses the same storage format as "ufs", utilizing a |
4218 | separate process to avoid blocking the main Squid process on | |
4219 | disk-I/O. | |
4c3ef9b2 | 4220 | |
638402dd AJ |
4221 | Usage: |
4222 | cache_dir diskd Directory-Name Mbytes L1 L2 [options] [Q1=n] [Q2=n] | |
0976f8db | 4223 | |
41bd17a4 | 4224 | see argument descriptions under ufs above |
0976f8db | 4225 | |
41bd17a4 | 4226 | Q1 specifies the number of unacknowledged I/O requests when Squid |
4227 | stops opening new files. If this many messages are in the queues, | |
4228 | Squid won't open new files. Default is 64 | |
0976f8db | 4229 | |
41bd17a4 | 4230 | Q2 specifies the number of unacknowledged messages when Squid |
4231 | starts blocking. If this many messages are in the queues, | |
4232 | Squid blocks until it receives some replies. Default is 72 | |
0976f8db | 4233 | |
41bd17a4 | 4234 | When Q1 < Q2 (the default), the cache directory is optimized |
4235 | for lower response time at the expense of a decrease in hit | |
4236 | ratio. If Q1 > Q2, the cache directory is optimized for | |
4237 | higher hit ratio at the expense of an increase in response | |
4238 | time. | |
0976f8db | 4239 | |
e2851fe7 | 4240 | |
638402dd AJ |
4241 | ==== The rock store type ==== |
4242 | ||
4243 | Usage: | |
e51ce7da | 4244 | cache_dir rock Directory-Name Mbytes [options] |
e2851fe7 | 4245 | |
2e55f083 | 4246 | The Rock Store type is a database-style storage. All cached |
e51ce7da AR |
4247 | entries are stored in a "database" file, using fixed-size slots. |
4248 | A single entry occupies one or more slots. | |
e2851fe7 | 4249 | |
3e1dfe3d AR |
4250 | If possible, Squid using Rock Store creates a dedicated kid |
4251 | process called "disker" to avoid blocking Squid worker(s) on disk | |
4252 | I/O. One disker kid is created for each rock cache_dir. Diskers | |
4253 | are created only when Squid, running in daemon mode, has support | |
4254 | for the IpcIo disk I/O module. | |
4255 | ||
43ebbac3 AR |
4256 | swap-timeout=msec: Squid will not start writing a miss to or |
4257 | reading a hit from disk if it estimates that the swap operation | |
4258 | will take more than the specified number of milliseconds. By | |
4259 | default and when set to zero, disables the disk I/O time limit | |
4260 | enforcement. Ignored when using blocking I/O module because | |
4261 | blocking synchronous I/O does not allow Squid to estimate the | |
4262 | expected swap wait time. | |
4263 | ||
df881a0f | 4264 | max-swap-rate=swaps/sec: Artificially limits disk access using |
1e614370 | 4265 | the specified I/O rate limit. Swap out requests that |
df881a0f | 4266 | would cause the average I/O rate to exceed the limit are |
1e614370 DK |
4267 | delayed. Individual swap in requests (i.e., hits or reads) are |
4268 | not delayed, but they do contribute to measured swap rate and | |
4269 | since they are placed in the same FIFO queue as swap out | |
4270 | requests, they may wait longer if max-swap-rate is smaller. | |
4271 | This is necessary on file systems that buffer "too | |
df881a0f AR |
4272 | many" writes and then start blocking Squid and other processes |
4273 | while committing those writes to disk. Usually used together | |
4274 | with swap-timeout to avoid excessive delays and queue overflows | |
4275 | when disk demand exceeds available disk "bandwidth". By default | |
4276 | and when set to zero, disables the disk I/O rate limit | |
4277 | enforcement. Currently supported by IpcIo module only. | |
4278 | ||
e51ce7da AR |
4279 | slot-size=bytes: The size of a database "record" used for |
4280 | storing cached responses. A cached response occupies at least | |
4281 | one slot and all database I/O is done using individual slots so | |
4282 | increasing this parameter leads to more disk space waste while | |
4283 | decreasing it leads to more disk I/O overheads. Should be a | |
4284 | multiple of your operating system I/O page size. Defaults to | |
4285 | 16KBytes. A housekeeping header is stored with each slot and | |
4286 | smaller slot-sizes will be rejected. The header is smaller than | |
4287 | 100 bytes. | |
4288 | ||
df881a0f | 4289 | |
638402dd | 4290 | ==== COMMON OPTIONS ==== |
0976f8db | 4291 | |
638402dd AJ |
4292 | no-store no new objects should be stored to this cache_dir. |
4293 | ||
4294 | min-size=n the minimum object size in bytes this cache_dir | |
4295 | will accept. It's used to restrict a cache_dir | |
4296 | to only store large objects (e.g. AUFS) while | |
4297 | other stores are optimized for smaller objects | |
73656056 | 4298 | (e.g. Rock). |
638402dd | 4299 | Defaults to 0. |
0976f8db | 4300 | |
638402dd AJ |
4301 | max-size=n the maximum object size in bytes this cache_dir |
4302 | supports. | |
499f852c A |
4303 | The value in maximum_object_size directive sets |
4304 | the default unless more specific details are | |
4305 | available (ie a small store capacity). | |
b6662ffd | 4306 | |
41bd17a4 | 4307 | Note: To make optimal use of the max-size limits you should order |
638402dd | 4308 | the cache_dir lines with the smallest max-size value first. |
0976f8db | 4309 | |
bebc043b | 4310 | NOCOMMENT_START |
e0855596 AJ |
4311 | |
4312 | # Uncomment and adjust the following to add a disk cache directory. | |
4313 | #cache_dir ufs @DEFAULT_SWAP_DIR@ 100 16 256 | |
bebc043b | 4314 | NOCOMMENT_END |
6b698a21 | 4315 | DOC_END |
0976f8db | 4316 | |
41bd17a4 | 4317 | NAME: store_dir_select_algorithm |
4318 | TYPE: string | |
4319 | LOC: Config.store_dir_select_algorithm | |
4320 | DEFAULT: least-load | |
6b698a21 | 4321 | DOC_START |
638402dd AJ |
4322 | How Squid selects which cache_dir to use when the response |
4323 | object will fit into more than one. | |
4324 | ||
4325 | Regardless of which algorithm is used the cache_dir min-size | |
4326 | and max-size parameters are obeyed. As such they can affect | |
4327 | the selection algorithm by limiting the set of considered | |
4328 | cache_dir. | |
4329 | ||
4330 | Algorithms: | |
4331 | ||
4332 | least-load | |
4333 | ||
4334 | This algorithm is suited to caches with similar cache_dir | |
4335 | sizes and disk speeds. | |
4336 | ||
4337 | The disk with the least I/O pending is selected. | |
4338 | When there are multiple disks with the same I/O load ranking | |
4339 | the cache_dir with most available capacity is selected. | |
4340 | ||
4341 | When a mix of cache_dir sizes are configured the faster disks | |
4342 | have a naturally lower I/O loading and larger disks have more | |
4343 | capacity. So space used to store objects and data throughput | |
4344 | may be very unbalanced towards larger disks. | |
4345 | ||
4346 | ||
4347 | round-robin | |
4348 | ||
4349 | This algorithm is suited to caches with unequal cache_dir | |
4350 | disk sizes. | |
4351 | ||
4352 | Each cache_dir is selected in a rotation. The next suitable | |
4353 | cache_dir is used. | |
4354 | ||
4355 | Available cache_dir capacity is only considered in relation | |
4356 | to whether the object will fit and meets the min-size and | |
4357 | max-size parameters. | |
4358 | ||
4359 | Disk I/O loading is only considered to prevent overload on slow | |
4360 | disks. This algorithm does not spread objects by size, so any | |
4361 | I/O loading per-disk may appear very unbalanced and volatile. | |
4362 | ||
29a238a3 AR |
4363 | If several cache_dirs use similar min-size, max-size, or other |
4364 | limits to to reject certain responses, then do not group such | |
4365 | cache_dir lines together, to avoid round-robin selection bias | |
4366 | towards the first cache_dir after the group. Instead, interleave | |
4367 | cache_dir lines from different groups. For example: | |
4368 | ||
4369 | store_dir_select_algorithm round-robin | |
4370 | cache_dir rock /hdd1 ... min-size=100000 | |
4371 | cache_dir rock /ssd1 ... max-size=99999 | |
4372 | cache_dir rock /hdd2 ... min-size=100000 | |
4373 | cache_dir rock /ssd2 ... max-size=99999 | |
4374 | cache_dir rock /hdd3 ... min-size=100000 | |
4375 | cache_dir rock /ssd3 ... max-size=99999 | |
6b698a21 | 4376 | DOC_END |
0976f8db | 4377 | |
41bd17a4 | 4378 | NAME: max_open_disk_fds |
4379 | TYPE: int | |
4380 | LOC: Config.max_open_disk_fds | |
4381 | DEFAULT: 0 | |
638402dd | 4382 | DEFAULT_DOC: no limit |
6b698a21 | 4383 | DOC_START |
41bd17a4 | 4384 | To avoid having disk as the I/O bottleneck Squid can optionally |
4385 | bypass the on-disk cache if more than this amount of disk file | |
4386 | descriptors are open. | |
4387 | ||
4388 | A value of 0 indicates no limit. | |
6b698a21 | 4389 | DOC_END |
0976f8db | 4390 | |
41bd17a4 | 4391 | NAME: cache_swap_low |
4392 | COMMENT: (percent, 0-100) | |
5473c134 | 4393 | TYPE: int |
41bd17a4 | 4394 | DEFAULT: 90 |
4395 | LOC: Config.Swap.lowWaterMark | |
638402dd | 4396 | DOC_START |
5f662601 AJ |
4397 | The low-water mark for AUFS/UFS/diskd cache object eviction by |
4398 | the cache_replacement_policy algorithm. | |
4399 | ||
4400 | Removal begins when the swap (disk) usage of a cache_dir is | |
4401 | above this low-water mark and attempts to maintain utilization | |
4402 | near the low-water mark. | |
4403 | ||
4404 | As swap utilization increases towards the high-water mark set | |
4405 | by cache_swap_high object eviction becomes more agressive. | |
4406 | ||
4407 | The value difference in percentages between low- and high-water | |
7bcaf76f | 4408 | marks represent an eviction rate of 300 objects per second and |
5f662601 AJ |
4409 | the rate continues to scale in agressiveness by multiples of |
4410 | this above the high-water mark. | |
638402dd AJ |
4411 | |
4412 | Defaults are 90% and 95%. If you have a large cache, 5% could be | |
4413 | hundreds of MB. If this is the case you may wish to set these | |
4414 | numbers closer together. | |
4415 | ||
5f662601 | 4416 | See also cache_swap_high and cache_replacement_policy |
638402dd | 4417 | DOC_END |
41bd17a4 | 4418 | |
4419 | NAME: cache_swap_high | |
4420 | COMMENT: (percent, 0-100) | |
4421 | TYPE: int | |
4422 | DEFAULT: 95 | |
4423 | LOC: Config.Swap.highWaterMark | |
6b698a21 | 4424 | DOC_START |
5f662601 AJ |
4425 | The high-water mark for AUFS/UFS/diskd cache object eviction by |
4426 | the cache_replacement_policy algorithm. | |
4427 | ||
4428 | Removal begins when the swap (disk) usage of a cache_dir is | |
4429 | above the low-water mark set by cache_swap_low and attempts to | |
4430 | maintain utilization near the low-water mark. | |
4431 | ||
4432 | As swap utilization increases towards this high-water mark object | |
4433 | eviction becomes more agressive. | |
4434 | ||
4435 | The value difference in percentages between low- and high-water | |
7bcaf76f | 4436 | marks represent an eviction rate of 300 objects per second and |
5f662601 AJ |
4437 | the rate continues to scale in agressiveness by multiples of |
4438 | this above the high-water mark. | |
41bd17a4 | 4439 | |
4440 | Defaults are 90% and 95%. If you have a large cache, 5% could be | |
4441 | hundreds of MB. If this is the case you may wish to set these | |
4442 | numbers closer together. | |
638402dd | 4443 | |
5f662601 | 4444 | See also cache_swap_low and cache_replacement_policy |
6b698a21 | 4445 | DOC_END |
0976f8db | 4446 | |
5473c134 | 4447 | COMMENT_START |
41bd17a4 | 4448 | LOGFILE OPTIONS |
5473c134 | 4449 | ----------------------------------------------------------------------------- |
4450 | COMMENT_END | |
0976f8db | 4451 | |
41bd17a4 | 4452 | NAME: logformat |
4453 | TYPE: logformat | |
20efa1c2 | 4454 | LOC: Log::TheConfig |
5473c134 | 4455 | DEFAULT: none |
638402dd | 4456 | DEFAULT_DOC: The format definitions squid, common, combined, referrer, useragent are built in. |
6b698a21 | 4457 | DOC_START |
41bd17a4 | 4458 | Usage: |
0976f8db | 4459 | |
41bd17a4 | 4460 | logformat <name> <format specification> |
0976f8db | 4461 | |
41bd17a4 | 4462 | Defines an access log format. |
6b698a21 | 4463 | |
41bd17a4 | 4464 | The <format specification> is a string with embedded % format codes |
5473c134 | 4465 | |
bec110e4 EB |
4466 | % format codes all follow the same basic structure where all |
4467 | components but the formatcode are optional and usually unnecessary, | |
4468 | especially when dealing with common codes. | |
6b698a21 | 4469 | |
bec110e4 | 4470 | % [encoding] [-] [[0]width] [{arg}] formatcode [{arg}] |
0976f8db | 4471 | |
bec110e4 EB |
4472 | encoding escapes or otherwise protects "special" characters: |
4473 | ||
4474 | " Quoted string encoding where quote(") and | |
4475 | backslash(\) characters are \-escaped while | |
4476 | CR, LF, and TAB characters are encoded as \r, | |
4477 | \n, and \t two-character sequences. | |
4478 | ||
4479 | [ Custom Squid encoding where percent(%), square | |
4480 | brackets([]), backslash(\) and characters with | |
4481 | codes outside of [32,126] range are %-encoded. | |
4482 | SP is not encoded. Used by log_mime_hdrs. | |
4483 | ||
4484 | # URL encoding (a.k.a. percent-encoding) where | |
4485 | all URL unsafe and control characters (per RFC | |
4486 | 1738) are %-encoded. | |
4487 | ||
4488 | / Shell-like encoding where quote(") and | |
4489 | backslash(\) characters are \-escaped while CR | |
4490 | and LF characters are encoded as \r and \n | |
4491 | two-character sequences. Values containing SP | |
4492 | character(s) are surrounded by quotes("). | |
4493 | ||
4494 | ' Raw/as-is encoding with no escaping/quoting. | |
4495 | ||
4496 | Default encoding: When no explicit encoding is | |
4497 | specified, each %code determines its own encoding. | |
4498 | Most %codes use raw/as-is encoding, but some codes use | |
4499 | a so called "pass-through URL encoding" where all URL | |
4500 | unsafe and control characters (per RFC 1738) are | |
4501 | %-encoded, but the percent character(%) is left as is. | |
5473c134 | 4502 | |
41bd17a4 | 4503 | - left aligned |
c32c6db7 AR |
4504 | |
4505 | width minimum and/or maximum field width: | |
4506 | [width_min][.width_max] | |
e2851fe7 AR |
4507 | When minimum starts with 0, the field is zero-padded. |
4508 | String values exceeding maximum width are truncated. | |
c32c6db7 | 4509 | |
4e56d7f6 AJ |
4510 | {arg} argument such as header name etc. This field may be |
4511 | placed before or after the token, but not both at once. | |
5473c134 | 4512 | |
41bd17a4 | 4513 | Format codes: |
5473c134 | 4514 | |
3ff65596 | 4515 | % a literal % character |
f4b68e1a AJ |
4516 | sn Unique sequence number per log line entry |
4517 | err_code The ID of an error response served by Squid or | |
4518 | a similar internal error identifier. | |
4519 | err_detail Additional err_code-dependent error information. | |
c7bcf010 | 4520 | note The annotation specified by the argument. Also |
d7f4a0b7 CT |
4521 | logs the adaptation meta headers set by the |
4522 | adaptation_meta configuration parameter. | |
c7bcf010 CT |
4523 | If no argument given all annotations logged. |
4524 | The argument may include a separator to use with | |
4525 | annotation values: | |
4526 | name[:separator] | |
4527 | By default, multiple note values are separated with "," | |
4528 | and multiple notes are separated with "\r\n". | |
4529 | When logging named notes with %{name}note, the | |
4530 | explicitly configured separator is used between note | |
4531 | values. When logging all notes with %note, the | |
4532 | explicitly configured separator is used between | |
4533 | individual notes. There is currently no way to | |
4534 | specify both value and notes separators when logging | |
4535 | all notes with %note. | |
f4b68e1a AJ |
4536 | |
4537 | Connection related format codes: | |
4538 | ||
41bd17a4 | 4539 | >a Client source IP address |
4540 | >A Client FQDN | |
4541 | >p Client source port | |
8652f8e7 AJ |
4542 | >eui Client source EUI (MAC address, EUI-48 or EUI-64 identifier) |
4543 | >la Local IP address the client connected to | |
4544 | >lp Local port number the client connected to | |
f123f5e9 | 4545 | >qos Client connection TOS/DSCP value set by Squid |
244da4ad | 4546 | >nfmark Client connection netfilter packet MARK set by Squid |
8652f8e7 | 4547 | |
28417506 CT |
4548 | la Local listening IP address the client connection was connected to. |
4549 | lp Local listening port number the client connection was connected to. | |
4550 | ||
8652f8e7 AJ |
4551 | <a Server IP address of the last server or peer connection |
4552 | <A Server FQDN or peer name | |
4553 | <p Server port number of the last server or peer connection | |
c3a082ae | 4554 | <la Local IP address of the last server or peer connection |
152e24b3 | 4555 | <lp Local port number of the last server or peer connection |
f123f5e9 | 4556 | <qos Server connection TOS/DSCP value set by Squid |
244da4ad | 4557 | <nfmark Server connection netfilter packet MARK set by Squid |
f4b68e1a | 4558 | |
6131103b CT |
4559 | >handshake Raw client handshake |
4560 | Initial client bytes received by Squid on a newly | |
4561 | accepted TCP connection or inside a just established | |
4562 | CONNECT tunnel. Squid stops accumulating handshake | |
4563 | bytes as soon as the handshake parser succeeds or | |
4564 | fails (determining whether the client is using the | |
4565 | expected protocol). | |
4566 | ||
4567 | For HTTP clients, the handshake is the request line. | |
4568 | For TLS clients, the handshake consists of all TLS | |
4569 | records up to and including the TLS record that | |
4570 | contains the last byte of the first ClientHello | |
4571 | message. For clients using an unsupported protocol, | |
4572 | this field contains the bytes received by Squid at the | |
4573 | time of the handshake parsing failure. | |
4574 | ||
4575 | See the on_unsupported_protocol directive for more | |
4576 | information on Squid handshake traffic expectations. | |
4577 | ||
4578 | Current support is limited to these contexts: | |
4579 | - http_port connections, but only when the | |
4580 | on_unsupported_protocol directive is in use. | |
4581 | - https_port connections (and CONNECT tunnels) that | |
4582 | are subject to the ssl_bump peek or stare action. | |
4583 | ||
4584 | To protect binary handshake data, this field is always | |
4585 | base64-encoded (RFC 4648 Section 4). If logformat | |
4586 | field encoding is configured, that encoding is applied | |
4587 | on top of base64. Otherwise, the computed base64 value | |
4588 | is recorded as is. | |
4589 | ||
f4b68e1a AJ |
4590 | Time related format codes: |
4591 | ||
41bd17a4 | 4592 | ts Seconds since epoch |
4593 | tu subsecond time (milliseconds) | |
4594 | tl Local time. Optional strftime format argument | |
3ff65596 | 4595 | default %d/%b/%Y:%H:%M:%S %z |
41bd17a4 | 4596 | tg GMT time. Optional strftime format argument |
3ff65596 | 4597 | default %d/%b/%Y:%H:%M:%S %z |
41bd17a4 | 4598 | tr Response time (milliseconds) |
3ff65596 | 4599 | dt Total time spent making DNS lookups (milliseconds) |
af0ded40 CT |
4600 | tS Approximate master transaction start time in |
4601 | <full seconds since epoch>.<fractional seconds> format. | |
4602 | Currently, Squid considers the master transaction | |
4603 | started when a complete HTTP request header initiating | |
4604 | the transaction is received from the client. This is | |
4605 | the same value that Squid uses to calculate transaction | |
4606 | response time when logging %tr to access.log. Currently, | |
4607 | Squid uses millisecond resolution for %tS values, | |
4608 | similar to the default access.log "current time" field | |
4609 | (%ts.%03tu). | |
3ff65596 | 4610 | |
8652f8e7 AJ |
4611 | Access Control related format codes: |
4612 | ||
4613 | et Tag returned by external acl | |
4614 | ea Log string returned by external acl | |
4615 | un User name (any available) | |
4616 | ul User name from authentication | |
4617 | ue User name from external acl helper | |
4618 | ui User name from ident | |
50b5c983 AJ |
4619 | un A user name. Expands to the first available name |
4620 | from the following list of information sources: | |
4621 | - authenticated user name, like %ul | |
4622 | - user name supplied by an external ACL, like %ue | |
4623 | - SSL client name, like %us | |
4624 | - ident user name, like %ui | |
d4806c91 CT |
4625 | credentials Client credentials. The exact meaning depends on |
4626 | the authentication scheme: For Basic authentication, | |
4627 | it is the password; for Digest, the realm sent by the | |
4628 | client; for NTLM and Negotiate, the client challenge | |
4629 | or client credentials prefixed with "YR " or "KK ". | |
8652f8e7 AJ |
4630 | |
4631 | HTTP related format codes: | |
3ff65596 | 4632 | |
d6df21d2 AJ |
4633 | REQUEST |
4634 | ||
4635 | [http::]rm Request method (GET/POST etc) | |
4636 | [http::]>rm Request method from client | |
4637 | [http::]<rm Request method sent to server or peer | |
bec110e4 EB |
4638 | |
4639 | [http::]ru Request URL received (or computed) and sanitized | |
4640 | ||
4641 | Logs request URI received from the client, a | |
4642 | request adaptation service, or a request | |
4643 | redirector (whichever was applied last). | |
4644 | ||
4645 | Computed URLs are URIs of internally generated | |
4646 | requests and various "error:..." URIs. | |
4647 | ||
4648 | Honors strip_query_terms and uri_whitespace. | |
4649 | ||
4650 | This field is not encoded by default. Encoding | |
4651 | this field using variants of %-encoding will | |
4652 | clash with uri_whitespace modifications that | |
4653 | also use %-encoding. | |
4654 | ||
4655 | [http::]>ru Request URL received from the client (or computed) | |
4656 | ||
4657 | Computed URLs are URIs of internally generated | |
4658 | requests and various "error:..." URIs. | |
4659 | ||
4660 | Unlike %ru, this request URI is not affected | |
4661 | by request adaptation, URL rewriting services, | |
4662 | and strip_query_terms. | |
4663 | ||
4664 | Honors uri_whitespace. | |
4665 | ||
4666 | This field is using pass-through URL encoding | |
4667 | by default. Encoding this field using other | |
4668 | variants of %-encoding will clash with | |
4669 | uri_whitespace modifications that also use | |
4670 | %-encoding. | |
4671 | ||
d6df21d2 | 4672 | [http::]<ru Request URL sent to server or peer |
5aca9cf2 AJ |
4673 | [http::]>rs Request URL scheme from client |
4674 | [http::]<rs Request URL scheme sent to server or peer | |
fa450988 | 4675 | [http::]>rd Request URL domain from client |
f42ac6e6 | 4676 | [http::]<rd Request URL domain sent to server or peer |
5aca9cf2 AJ |
4677 | [http::]>rP Request URL port from client |
4678 | [http::]<rP Request URL port sent to server or peer | |
4679 | [http::]rp Request URL path excluding hostname | |
4680 | [http::]>rp Request URL path excluding hostname from client | |
4681 | [http::]<rp Request URL path excluding hostname sent to server or peer | |
d6df21d2 AJ |
4682 | [http::]rv Request protocol version |
4683 | [http::]>rv Request protocol version from client | |
4684 | [http::]<rv Request protocol version sent to server or peer | |
4685 | ||
5aca9cf2 | 4686 | [http::]>h Original received request header. |
19483c50 AR |
4687 | Usually differs from the request header sent by |
4688 | Squid, although most fields are often preserved. | |
4689 | Accepts optional header field name/value filter | |
4690 | argument using name[:[separator]element] format. | |
4691 | [http::]>ha Received request header after adaptation and | |
4692 | redirection (pre-cache REQMOD vectoring point). | |
4693 | Usually differs from the request header sent by | |
4694 | Squid, although most fields are often preserved. | |
6fca33e0 | 4695 | Optional header name argument as for >h |
d6df21d2 | 4696 | |
d6df21d2 AJ |
4697 | RESPONSE |
4698 | ||
4699 | [http::]<Hs HTTP status code received from the next hop | |
4700 | [http::]>Hs HTTP status code sent to the client | |
4701 | ||
3ff65596 AR |
4702 | [http::]<h Reply header. Optional header name argument |
4703 | as for >h | |
d6df21d2 AJ |
4704 | |
4705 | [http::]mt MIME content type | |
4706 | ||
4707 | ||
4708 | SIZE COUNTERS | |
4709 | ||
4710 | [http::]st Total size of request + reply traffic with client | |
4711 | [http::]>st Total size of request received from client. | |
4712 | Excluding chunked encoding bytes. | |
4713 | [http::]<st Total size of reply sent to client (after adaptation) | |
4714 | ||
4715 | [http::]>sh Size of request headers received from client | |
4716 | [http::]<sh Size of reply headers sent to client (after adaptation) | |
4717 | ||
4718 | [http::]<sH Reply high offset sent | |
4719 | [http::]<sS Upstream object size | |
4720 | ||
bae917ac CT |
4721 | [http::]<bs Number of HTTP-equivalent message body bytes |
4722 | received from the next hop, excluding chunked | |
4723 | transfer encoding and control messages. | |
4724 | Generated FTP/Gopher listings are treated as | |
4725 | received bodies. | |
d6df21d2 | 4726 | |
d6df21d2 AJ |
4727 | TIMING |
4728 | ||
3ff65596 AR |
4729 | [http::]<pt Peer response time in milliseconds. The timer starts |
4730 | when the last request byte is sent to the next hop | |
4731 | and stops when the last response byte is received. | |
d5430dc8 | 4732 | [http::]<tt Total time in milliseconds. The timer |
3ff65596 AR |
4733 | starts with the first connect request (or write I/O) |
4734 | sent to the first selected peer. The timer stops | |
4735 | with the last I/O with the last peer. | |
4736 | ||
8652f8e7 AJ |
4737 | Squid handling related format codes: |
4738 | ||
4739 | Ss Squid request status (TCP_MISS etc) | |
4740 | Sh Squid hierarchy status (DEFAULT_PARENT etc) | |
4741 | ||
08097970 AR |
4742 | SSL-related format codes: |
4743 | ||
4744 | ssl::bump_mode SslBump decision for the transaction: | |
4745 | ||
4746 | For CONNECT requests that initiated bumping of | |
4747 | a connection and for any request received on | |
4748 | an already bumped connection, Squid logs the | |
bf352fb2 CT |
4749 | corresponding SslBump mode ("splice", "bump", |
4750 | "peek", "stare", "terminate", "server-first" | |
4751 | or "client-first"). See the ssl_bump option | |
4752 | for more information about these modes. | |
08097970 AR |
4753 | |
4754 | A "none" token is logged for requests that | |
4755 | triggered "ssl_bump" ACL evaluation matching | |
bf352fb2 | 4756 | a "none" rule. |
08097970 AR |
4757 | |
4758 | In all other cases, a single dash ("-") is | |
4759 | logged. | |
4760 | ||
4f6990ec | 4761 | ssl::>sni SSL client SNI sent to Squid. |
cedca6e7 | 4762 | |
c28b9a0e AJ |
4763 | ssl::>cert_subject |
4764 | The Subject field of the received client | |
4765 | SSL certificate or a dash ('-') if Squid has | |
4766 | received an invalid/malformed certificate or | |
4767 | no certificate at all. Consider encoding the | |
4768 | logged value because Subject often has spaces. | |
4769 | ||
4770 | ssl::>cert_issuer | |
4771 | The Issuer field of the received client | |
4772 | SSL certificate or a dash ('-') if Squid has | |
4773 | received an invalid/malformed certificate or | |
4774 | no certificate at all. Consider encoding the | |
4775 | logged value because Issuer often has spaces. | |
4776 | ||
e2e33acc CT |
4777 | ssl::<cert_subject |
4778 | The Subject field of the received server | |
4779 | TLS certificate or a dash ('-') if this is | |
4780 | not available. Consider encoding the logged | |
4781 | value because Subject often has spaces. | |
4782 | ||
8f1c6091 | 4783 | ssl::<cert_issuer |
e2e33acc CT |
4784 | The Issuer field of the received server |
4785 | TLS certificate or a dash ('-') if this is | |
4786 | not available. Consider encoding the logged | |
4787 | value because Issuer often has spaces. | |
4788 | ||
12b5040f DN |
4789 | ssl::<cert |
4790 | The received server x509 certificate in PEM | |
4791 | format, including BEGIN and END lines (or a | |
4792 | dash ('-') if the certificate is unavailable). | |
4793 | ||
4794 | WARNING: Large certificates will exceed the | |
4795 | current 8KB access.log record limit, resulting | |
4796 | in truncated records. Such truncation usually | |
4797 | happens in the middle of a record field. The | |
4798 | limit applies to all access logging modules. | |
4799 | ||
4800 | The logged certificate may have failed | |
4801 | validation and may not be trusted by Squid. | |
4802 | This field does not include any intermediate | |
4803 | certificates that may have been received from | |
4804 | the server or fetched during certificate | |
4805 | validation process. | |
4806 | ||
4807 | Currently, Squid only collects server | |
4808 | certificates during step3 of SslBump | |
4809 | processing; connections that were not subject | |
4810 | to ssl_bump rules or that did not match a peek | |
4811 | or stare rule at step2 will not have the | |
4812 | server certificate information. | |
4813 | ||
4814 | This field is using pass-through URL encoding | |
4815 | by default. | |
4816 | ||
c28b9a0e AJ |
4817 | ssl::<cert_errors |
4818 | The list of certificate validation errors | |
4819 | detected by Squid (including OpenSSL and | |
4820 | certificate validation helper components). The | |
4821 | errors are listed in the discovery order. By | |
4822 | default, the error codes are separated by ':'. | |
4823 | Accepts an optional separator argument. | |
4824 | ||
2bcab852 CT |
4825 | %ssl::>negotiated_version The negotiated TLS version of the |
4826 | client connection. | |
4827 | ||
4828 | %ssl::<negotiated_version The negotiated TLS version of the | |
4829 | last server or peer connection. | |
4830 | ||
4831 | %ssl::>received_hello_version The TLS version of the Hello | |
4832 | message received from TLS client. | |
4833 | ||
4834 | %ssl::<received_hello_version The TLS version of the Hello | |
4835 | message received from TLS server. | |
4836 | ||
4837 | %ssl::>received_supported_version The maximum TLS version | |
4838 | supported by the TLS client. | |
4839 | ||
4840 | %ssl::<received_supported_version The maximum TLS version | |
4841 | supported by the TLS server. | |
4842 | ||
4843 | %ssl::>negotiated_cipher The negotiated cipher of the | |
4844 | client connection. | |
4845 | ||
4846 | %ssl::<negotiated_cipher The negotiated cipher of the | |
4847 | last server or peer connection. | |
4848 | ||
5038f9d8 | 4849 | If ICAP is enabled, the following code becomes available (as |
3ff65596 AR |
4850 | well as ICAP log codes documented with the icap_log option): |
4851 | ||
4852 | icap::tt Total ICAP processing time for the HTTP | |
4853 | transaction. The timer ticks when ICAP | |
4854 | ACLs are checked and when ICAP | |
4855 | transaction is in progress. | |
4856 | ||
c28b9a0e | 4857 | If adaptation is enabled the following codes become available: |
3ff65596 | 4858 | |
5038f9d8 AR |
4859 | adapt::<last_h The header of the last ICAP response or |
4860 | meta-information from the last eCAP | |
4861 | transaction related to the HTTP transaction. | |
4862 | Like <h, accepts an optional header name | |
4863 | argument. | |
3ff65596 AR |
4864 | |
4865 | adapt::sum_trs Summed adaptation transaction response | |
4866 | times recorded as a comma-separated list in | |
4867 | the order of transaction start time. Each time | |
4868 | value is recorded as an integer number, | |
4869 | representing response time of one or more | |
4870 | adaptation (ICAP or eCAP) transaction in | |
4871 | milliseconds. When a failed transaction is | |
4872 | being retried or repeated, its time is not | |
4873 | logged individually but added to the | |
4874 | replacement (next) transaction. See also: | |
4875 | adapt::all_trs. | |
4876 | ||
4877 | adapt::all_trs All adaptation transaction response times. | |
4878 | Same as adaptation_strs but response times of | |
4879 | individual transactions are never added | |
4880 | together. Instead, all transaction response | |
4881 | times are recorded individually. | |
4882 | ||
4883 | You can prefix adapt::*_trs format codes with adaptation | |
4884 | service name in curly braces to record response time(s) specific | |
4885 | to that service. For example: %{my_service}adapt::sum_trs | |
5473c134 | 4886 | |
36c774f7 EB |
4887 | Format codes related to the PROXY protocol: |
4888 | ||
4889 | proxy_protocol::>h PROXY protocol header, including optional TLVs. | |
4890 | ||
4891 | Supports the same field and element reporting/extraction logic | |
4892 | as %http::>h. For configuration and reporting purposes, Squid | |
4893 | maps each PROXY TLV to an HTTP header field: the TLV type | |
4894 | (configured as a decimal integer) is the field name, and the | |
4895 | TLV value is the field value. All TLVs of "LOCAL" connections | |
4896 | (in PROXY protocol terminology) are currently skipped/ignored. | |
4897 | ||
4898 | Squid also maps the following standard PROXY protocol header | |
4899 | blocks to pseudo HTTP headers (their names use PROXY | |
4900 | terminology and start with a colon, following HTTP tradition | |
4901 | for pseudo headers): :command, :version, :src_addr, :dst_addr, | |
4902 | :src_port, and :dst_port. | |
4903 | ||
4904 | Without optional parameters, this logformat code logs | |
4905 | pseudo headers and TLVs. | |
4906 | ||
4907 | This format code uses pass-through URL encoding by default. | |
4908 | ||
4909 | Example: | |
4910 | # relay custom PROXY TLV #224 to adaptation services | |
4911 | adaptation_meta Client-Foo "%proxy_protocol::>h{224}" | |
4912 | ||
4913 | See also: %http::>h | |
4914 | ||
7d9acc3c AJ |
4915 | The default formats available (which do not need re-defining) are: |
4916 | ||
bd85ea1f AJ |
4917 | logformat squid %ts.%03tu %6tr %>a %Ss/%03>Hs %<st %rm %ru %[un %Sh/%<a %mt |
4918 | logformat common %>a %[ui %[un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st %Ss:%Sh | |
4919 | logformat combined %>a %[ui %[un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st "%{Referer}>h" "%{User-Agent}>h" %Ss:%Sh | |
20efa1c2 AJ |
4920 | logformat referrer %ts.%03tu %>a %{Referer}>h %ru |
4921 | logformat useragent %>a [%tl] "%{User-Agent}>h" | |
4922 | ||
8652f8e7 AJ |
4923 | NOTE: When the log_mime_hdrs directive is set to ON. |
4924 | The squid, common and combined formats have a safely encoded copy | |
4925 | of the mime headers appended to each line within a pair of brackets. | |
4926 | ||
4927 | NOTE: The common and combined formats are not quite true to the Apache definition. | |
4928 | The logs from Squid contain an extra status and hierarchy code appended. | |
20efa1c2 | 4929 | |
5473c134 | 4930 | DOC_END |
4931 | ||
41bd17a4 | 4932 | NAME: access_log cache_access_log |
4933 | TYPE: access_log | |
4934 | LOC: Config.Log.accesslogs | |
82b7abe3 | 4935 | DEFAULT_IF_NONE: daemon:@DEFAULT_ACCESS_LOG@ squid |
5473c134 | 4936 | DOC_START |
fb0c2f17 NH |
4937 | Configures whether and how Squid logs HTTP and ICP transactions. |
4938 | If access logging is enabled, a single line is logged for every | |
4939 | matching HTTP or ICP request. The recommended directive formats are: | |
4940 | ||
4941 | access_log <module>:<place> [option ...] [acl acl ...] | |
4942 | access_log none [acl acl ...] | |
4943 | ||
4944 | The following directive format is accepted but may be deprecated: | |
82b7abe3 | 4945 | access_log <module>:<place> [<logformat name> [acl acl ...]] |
fb0c2f17 NH |
4946 | |
4947 | In most cases, the first ACL name must not contain the '=' character | |
4948 | and should not be equal to an existing logformat name. You can always | |
4949 | start with an 'all' ACL to work around those restrictions. | |
82b7abe3 AJ |
4950 | |
4951 | Will log to the specified module:place using the specified format (which | |
41bd17a4 | 4952 | must be defined in a logformat directive) those entries which match |
4953 | ALL the acl's specified (which must be defined in acl clauses). | |
82b7abe3 AJ |
4954 | If no acl is specified, all requests will be logged to this destination. |
4955 | ||
fb0c2f17 NH |
4956 | ===== Available options for the recommended directive format ===== |
4957 | ||
4958 | logformat=name Names log line format (either built-in or | |
4959 | defined by a logformat directive). Defaults | |
4960 | to 'squid'. | |
4961 | ||
4962 | buffer-size=64KB Defines approximate buffering limit for log | |
4963 | records (see buffered_logs). Squid should not | |
4964 | keep more than the specified size and, hence, | |
4965 | should flush records before the buffer becomes | |
4966 | full to avoid overflows under normal | |
4967 | conditions (the exact flushing algorithm is | |
4968 | module-dependent though). The on-error option | |
4969 | controls overflow handling. | |
4970 | ||
4971 | on-error=die|drop Defines action on unrecoverable errors. The | |
4972 | 'drop' action ignores (i.e., does not log) | |
4973 | affected log records. The default 'die' action | |
4974 | kills the affected worker. The drop action | |
4975 | support has not been tested for modules other | |
4976 | than tcp. | |
4977 | ||
efc23871 AJ |
4978 | rotate=N Specifies the number of log file rotations to |
4979 | make when you run 'squid -k rotate'. The default | |
4980 | is to obey the logfile_rotate directive. Setting | |
4981 | rotate=0 will disable the file name rotation, | |
4982 | but the log files are still closed and re-opened. | |
4983 | This will enable you to rename the logfiles | |
4984 | yourself just before sending the rotate signal. | |
4985 | Only supported by the stdio module. | |
4986 | ||
82b7abe3 AJ |
4987 | ===== Modules Currently available ===== |
4988 | ||
bb7a1781 | 4989 | none Do not log any requests matching these ACL. |
82b7abe3 AJ |
4990 | Do not specify Place or logformat name. |
4991 | ||
4992 | stdio Write each log line to disk immediately at the completion of | |
4993 | each request. | |
4994 | Place: the filename and path to be written. | |
4995 | ||
4996 | daemon Very similar to stdio. But instead of writing to disk the log | |
4997 | line is passed to a daemon helper for asychronous handling instead. | |
4998 | Place: varies depending on the daemon. | |
4999 | ||
5000 | log_file_daemon Place: the file name and path to be written. | |
5001 | ||
5002 | syslog To log each request via syslog facility. | |
5003 | Place: The syslog facility and priority level for these entries. | |
5004 | Place Format: facility.priority | |
5473c134 | 5005 | |
82b7abe3 AJ |
5006 | where facility could be any of: |
5007 | authpriv, daemon, local0 ... local7 or user. | |
5473c134 | 5008 | |
82b7abe3 AJ |
5009 | And priority could be any of: |
5010 | err, warning, notice, info, debug. | |
5011 | ||
5012 | udp To send each log line as text data to a UDP receiver. | |
5013 | Place: The destination host name or IP and port. | |
f4fc8610 | 5014 | Place Format: //host:port |
df2eec10 | 5015 | |
2bf4e8fa | 5016 | tcp To send each log line as text data to a TCP receiver. |
fb0c2f17 | 5017 | Lines may be accumulated before sending (see buffered_logs). |
2bf4e8fa | 5018 | Place: The destination host name or IP and port. |
f4fc8610 | 5019 | Place Format: //host:port |
df2eec10 AJ |
5020 | |
5021 | Default: | |
82b7abe3 | 5022 | access_log daemon:@DEFAULT_ACCESS_LOG@ squid |
41bd17a4 | 5023 | DOC_END |
5473c134 | 5024 | |
3ff65596 AR |
5025 | NAME: icap_log |
5026 | TYPE: access_log | |
5027 | IFDEF: ICAP_CLIENT | |
5028 | LOC: Config.Log.icaplogs | |
5029 | DEFAULT: none | |
5030 | DOC_START | |
5031 | ICAP log files record ICAP transaction summaries, one line per | |
5032 | transaction. | |
5033 | ||
5034 | The icap_log option format is: | |
5035 | icap_log <filepath> [<logformat name> [acl acl ...]] | |
5036 | icap_log none [acl acl ...]] | |
5037 | ||
5038 | Please see access_log option documentation for details. The two | |
5039 | kinds of logs share the overall configuration approach and many | |
5040 | features. | |
5041 | ||
5042 | ICAP processing of a single HTTP message or transaction may | |
5043 | require multiple ICAP transactions. In such cases, multiple | |
5044 | ICAP transaction log lines will correspond to a single access | |
5045 | log line. | |
5046 | ||
bd59d61c EB |
5047 | ICAP log supports many access.log logformat %codes. In ICAP context, |
5048 | HTTP message-related %codes are applied to the HTTP message embedded | |
5049 | in an ICAP message. Logformat "%http::>..." codes are used for HTTP | |
5050 | messages embedded in ICAP requests while "%http::<..." codes are used | |
5051 | for HTTP messages embedded in ICAP responses. For example: | |
5052 | ||
5053 | http::>h To-be-adapted HTTP message headers sent by Squid to | |
5054 | the ICAP service. For REQMOD transactions, these are | |
5055 | HTTP request headers. For RESPMOD, these are HTTP | |
5056 | response headers, but Squid currently cannot log them | |
5057 | (i.e., %http::>h will expand to "-" for RESPMOD). | |
5058 | ||
5059 | http::<h Adapted HTTP message headers sent by the ICAP | |
5060 | service to Squid (i.e., HTTP request headers in regular | |
5061 | REQMOD; HTTP response headers in RESPMOD and during | |
5062 | request satisfaction in REQMOD). | |
5063 | ||
5064 | ICAP OPTIONS transactions do not embed HTTP messages. | |
5065 | ||
5066 | Several logformat codes below deal with ICAP message bodies. An ICAP | |
5067 | message body, if any, typically includes a complete HTTP message | |
5068 | (required HTTP headers plus optional HTTP message body). When | |
5069 | computing HTTP message body size for these logformat codes, Squid | |
5070 | either includes or excludes chunked encoding overheads; see | |
5071 | code-specific documentation for details. | |
5072 | ||
5073 | For Secure ICAP services, all size-related information is currently | |
5074 | computed before/after TLS encryption/decryption, as if TLS was not | |
5075 | in use at all. | |
3ff65596 AR |
5076 | |
5077 | The following format codes are also available for ICAP logs: | |
5078 | ||
5079 | icap::<A ICAP server IP address. Similar to <A. | |
5080 | ||
5081 | icap::<service_name ICAP service name from the icap_service | |
5082 | option in Squid configuration file. | |
5083 | ||
5084 | icap::ru ICAP Request-URI. Similar to ru. | |
5085 | ||
5086 | icap::rm ICAP request method (REQMOD, RESPMOD, or | |
5087 | OPTIONS). Similar to existing rm. | |
5088 | ||
bd59d61c EB |
5089 | icap::>st The total size of the ICAP request sent to the ICAP |
5090 | server (ICAP headers + ICAP body), including chunking | |
5091 | metadata (if any). | |
3ff65596 | 5092 | |
bd59d61c EB |
5093 | icap::<st The total size of the ICAP response received from the |
5094 | ICAP server (ICAP headers + ICAP body), including | |
5095 | chunking metadata (if any). | |
3ff65596 | 5096 | |
bd59d61c EB |
5097 | icap::<bs The size of the ICAP response body received from the |
5098 | ICAP server, excluding chunking metadata (if any). | |
bae917ac | 5099 | |
3ff65596 AR |
5100 | icap::tr Transaction response time (in |
5101 | milliseconds). The timer starts when | |
5102 | the ICAP transaction is created and | |
5103 | stops when the transaction is completed. | |
5104 | Similar to tr. | |
5105 | ||
5106 | icap::tio Transaction I/O time (in milliseconds). The | |
5107 | timer starts when the first ICAP request | |
5108 | byte is scheduled for sending. The timers | |
5109 | stops when the last byte of the ICAP response | |
5110 | is received. | |
5111 | ||
5112 | icap::to Transaction outcome: ICAP_ERR* for all | |
5113 | transaction errors, ICAP_OPT for OPTION | |
5114 | transactions, ICAP_ECHO for 204 | |
5115 | responses, ICAP_MOD for message | |
5116 | modification, and ICAP_SAT for request | |
5117 | satisfaction. Similar to Ss. | |
5118 | ||
5119 | icap::Hs ICAP response status code. Similar to Hs. | |
5120 | ||
5121 | icap::>h ICAP request header(s). Similar to >h. | |
5122 | ||
5123 | icap::<h ICAP response header(s). Similar to <h. | |
5124 | ||
5125 | The default ICAP log format, which can be used without an explicit | |
5126 | definition, is called icap_squid: | |
5127 | ||
bd59d61c | 5128 | logformat icap_squid %ts.%03tu %6icap::tr %>A %icap::to/%03icap::Hs %icap::<st %icap::rm %icap::ru %un -/%icap::<A - |
3ff65596 | 5129 | |
bd59d61c | 5130 | See also: logformat and %adapt::<last_h |
3ff65596 AR |
5131 | DOC_END |
5132 | ||
82b7abe3 AJ |
5133 | NAME: logfile_daemon |
5134 | TYPE: string | |
5135 | DEFAULT: @DEFAULT_LOGFILED@ | |
5136 | LOC: Log::TheConfig.logfile_daemon | |
5137 | DOC_START | |
5138 | Specify the path to the logfile-writing daemon. This daemon is | |
5139 | used to write the access and store logs, if configured. | |
14b24caf HN |
5140 | |
5141 | Squid sends a number of commands to the log daemon: | |
5142 | L<data>\n - logfile data | |
5143 | R\n - rotate file | |
5144 | T\n - truncate file | |
dd68402f | 5145 | O\n - reopen file |
14b24caf HN |
5146 | F\n - flush file |
5147 | r<n>\n - set rotate count to <n> | |
5148 | b<n>\n - 1 = buffer output, 0 = don't buffer output | |
5149 | ||
5150 | No responses is expected. | |
82b7abe3 AJ |
5151 | DOC_END |
5152 | ||
8ebad780 | 5153 | NAME: stats_collection |
3ff65596 | 5154 | TYPE: acl_access |
8ebad780 | 5155 | LOC: Config.accessList.stats_collection |
3ff65596 | 5156 | DEFAULT: none |
638402dd | 5157 | DEFAULT_DOC: Allow logging for all transactions. |
5b0f5383 | 5158 | COMMENT: allow|deny acl acl... |
3ff65596 | 5159 | DOC_START |
8ebad780 CT |
5160 | This options allows you to control which requests gets accounted |
5161 | in performance counters. | |
b3567eb5 FC |
5162 | |
5163 | This clause only supports fast acl types. | |
5164 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
3ff65596 AR |
5165 | DOC_END |
5166 | ||
41bd17a4 | 5167 | NAME: cache_store_log |
5168 | TYPE: string | |
df2eec10 | 5169 | DEFAULT: none |
41bd17a4 | 5170 | LOC: Config.Log.store |
5171 | DOC_START | |
5172 | Logs the activities of the storage manager. Shows which | |
5173 | objects are ejected from the cache, and which objects are | |
6d1dfcfc | 5174 | saved and for how long. |
df2eec10 | 5175 | There are not really utilities to analyze this data, so you can safely |
6d1dfcfc AJ |
5176 | disable it (the default). |
5177 | ||
5178 | Store log uses modular logging outputs. See access_log for the list | |
5179 | of modules supported. | |
5180 | ||
e0855596 | 5181 | Example: |
6d1dfcfc AJ |
5182 | cache_store_log stdio:@DEFAULT_STORE_LOG@ |
5183 | cache_store_log daemon:@DEFAULT_STORE_LOG@ | |
5473c134 | 5184 | DOC_END |
5185 | ||
41bd17a4 | 5186 | NAME: cache_swap_state cache_swap_log |
5187 | TYPE: string | |
5188 | LOC: Config.Log.swap | |
5473c134 | 5189 | DEFAULT: none |
638402dd | 5190 | DEFAULT_DOC: Store the journal inside its cache_dir |
5473c134 | 5191 | DOC_START |
41bd17a4 | 5192 | Location for the cache "swap.state" file. This index file holds |
5193 | the metadata of objects saved on disk. It is used to rebuild | |
5194 | the cache during startup. Normally this file resides in each | |
5195 | 'cache_dir' directory, but you may specify an alternate | |
5196 | pathname here. Note you must give a full filename, not just | |
5197 | a directory. Since this is the index for the whole object | |
5198 | list you CANNOT periodically rotate it! | |
5473c134 | 5199 | |
41bd17a4 | 5200 | If %s can be used in the file name it will be replaced with a |
5201 | a representation of the cache_dir name where each / is replaced | |
5202 | with '.'. This is needed to allow adding/removing cache_dir | |
5203 | lines when cache_swap_log is being used. | |
5473c134 | 5204 | |
41bd17a4 | 5205 | If have more than one 'cache_dir', and %s is not used in the name |
5206 | these swap logs will have names such as: | |
5473c134 | 5207 | |
41bd17a4 | 5208 | cache_swap_log.00 |
5209 | cache_swap_log.01 | |
5210 | cache_swap_log.02 | |
5473c134 | 5211 | |
41bd17a4 | 5212 | The numbered extension (which is added automatically) |
5213 | corresponds to the order of the 'cache_dir' lines in this | |
5214 | configuration file. If you change the order of the 'cache_dir' | |
5215 | lines in this file, these index files will NOT correspond to | |
5216 | the correct 'cache_dir' entry (unless you manually rename | |
5217 | them). We recommend you do NOT use this option. It is | |
5218 | better to keep these index files in each 'cache_dir' directory. | |
5473c134 | 5219 | DOC_END |
5220 | ||
41bd17a4 | 5221 | NAME: logfile_rotate |
5222 | TYPE: int | |
5223 | DEFAULT: 10 | |
5224 | LOC: Config.Log.rotateNumber | |
5473c134 | 5225 | DOC_START |
efc23871 | 5226 | Specifies the default number of logfile rotations to make when you |
41bd17a4 | 5227 | type 'squid -k rotate'. The default is 10, which will rotate |
5228 | with extensions 0 through 9. Setting logfile_rotate to 0 will | |
5229 | disable the file name rotation, but the logfiles are still closed | |
5230 | and re-opened. This will enable you to rename the logfiles | |
5231 | yourself just before sending the rotate signal. | |
5473c134 | 5232 | |
efc23871 AJ |
5233 | Note, from Squid-3.1 this option is only a default for cache.log, |
5234 | that log can be rotated separately by using debug_options. | |
5235 | ||
66f92ffc | 5236 | Note, from Squid-4 this option is only a default for access.log |
efc23871 AJ |
5237 | recorded by stdio: module. Those logs can be rotated separately by |
5238 | using the rotate=N option on their access_log directive. | |
5239 | ||
41bd17a4 | 5240 | Note, the 'squid -k rotate' command normally sends a USR1 |
5241 | signal to the running squid process. In certain situations | |
5242 | (e.g. on Linux with Async I/O), USR1 is used for other | |
5243 | purposes, so -k rotate uses another signal. It is best to get | |
5244 | in the habit of using 'squid -k rotate' instead of 'kill -USR1 | |
5245 | <pid>'. | |
62493678 | 5246 | |
41bd17a4 | 5247 | DOC_END |
5473c134 | 5248 | |
41bd17a4 | 5249 | NAME: mime_table |
5250 | TYPE: string | |
5251 | DEFAULT: @DEFAULT_MIME_TABLE@ | |
5252 | LOC: Config.mimeTablePathname | |
5253 | DOC_START | |
638402dd AJ |
5254 | Path to Squid's icon configuration file. |
5255 | ||
5256 | You shouldn't need to change this, but the default file contains | |
5257 | examples and formatting information if you do. | |
5473c134 | 5258 | DOC_END |
5259 | ||
41bd17a4 | 5260 | NAME: log_mime_hdrs |
5261 | COMMENT: on|off | |
5262 | TYPE: onoff | |
5263 | LOC: Config.onoff.log_mime_hdrs | |
5264 | DEFAULT: off | |
5265 | DOC_START | |
5266 | The Cache can record both the request and the response MIME | |
5267 | headers for each HTTP transaction. The headers are encoded | |
5268 | safely and will appear as two bracketed fields at the end of | |
5269 | the access log (for either the native or httpd-emulated log | |
5270 | formats). To enable this logging set log_mime_hdrs to 'on'. | |
5271 | DOC_END | |
5473c134 | 5272 | |
41bd17a4 | 5273 | NAME: pid_filename |
5274 | TYPE: string | |
5275 | DEFAULT: @DEFAULT_PID_FILE@ | |
5276 | LOC: Config.pidFilename | |
5473c134 | 5277 | DOC_START |
41bd17a4 | 5278 | A filename to write the process-id to. To disable, enter "none". |
5473c134 | 5279 | DOC_END |
5280 | ||
41bd17a4 | 5281 | NAME: client_netmask |
5282 | TYPE: address | |
5283 | LOC: Config.Addrs.client_netmask | |
0eb08770 | 5284 | DEFAULT: no_addr |
638402dd | 5285 | DEFAULT_DOC: Log full client IP address |
5473c134 | 5286 | DOC_START |
41bd17a4 | 5287 | A netmask for client addresses in logfiles and cachemgr output. |
5288 | Change this to protect the privacy of your cache clients. | |
5289 | A netmask of 255.255.255.0 will log all IP's in that range with | |
5290 | the last digit set to '0'. | |
5473c134 | 5291 | DOC_END |
5292 | ||
41bd17a4 | 5293 | NAME: strip_query_terms |
5473c134 | 5294 | TYPE: onoff |
41bd17a4 | 5295 | LOC: Config.onoff.strip_query_terms |
5473c134 | 5296 | DEFAULT: on |
5297 | DOC_START | |
41bd17a4 | 5298 | By default, Squid strips query terms from requested URLs before |
638402dd AJ |
5299 | logging. This protects your user's privacy and reduces log size. |
5300 | ||
5301 | When investigating HIT/MISS or other caching behaviour you | |
5302 | will need to disable this to see the full URL used by Squid. | |
5473c134 | 5303 | DOC_END |
5304 | ||
41bd17a4 | 5305 | NAME: buffered_logs |
5306 | COMMENT: on|off | |
5307 | TYPE: onoff | |
5308 | DEFAULT: off | |
5309 | LOC: Config.onoff.buffered_logs | |
5473c134 | 5310 | DOC_START |
638402dd AJ |
5311 | Whether to write/send access_log records ASAP or accumulate them and |
5312 | then write/send them in larger chunks. Buffering may improve | |
5313 | performance because it decreases the number of I/Os. However, | |
5314 | buffering increases the delay before log records become available to | |
5315 | the final recipient (e.g., a disk file or logging daemon) and, | |
5316 | hence, increases the risk of log records loss. | |
5317 | ||
5318 | Note that even when buffered_logs are off, Squid may have to buffer | |
5319 | records if it cannot write/send them immediately due to pending I/Os | |
5320 | (e.g., the I/O writing the previous log record) or connectivity loss. | |
5321 | ||
fb0c2f17 | 5322 | Currently honored by 'daemon' and 'tcp' access_log modules only. |
6b698a21 | 5323 | DOC_END |
0976f8db | 5324 | |
2b753521 | 5325 | NAME: netdb_filename |
5326 | TYPE: string | |
221faecb | 5327 | DEFAULT: stdio:@DEFAULT_NETDB_FILE@ |
2b753521 | 5328 | LOC: Config.netdbFilename |
fb6a61d1 | 5329 | IFDEF: USE_ICMP |
2b753521 | 5330 | DOC_START |
638402dd AJ |
5331 | Where Squid stores it's netdb journal. |
5332 | When enabled this journal preserves netdb state between restarts. | |
5333 | ||
2b753521 | 5334 | To disable, enter "none". |
5335 | DOC_END | |
5336 | ||
62493678 AJ |
5337 | COMMENT_START |
5338 | OPTIONS FOR TROUBLESHOOTING | |
5339 | ----------------------------------------------------------------------------- | |
5340 | COMMENT_END | |
5341 | ||
5342 | NAME: cache_log | |
5343 | TYPE: string | |
62493678 AJ |
5344 | DEFAULT_IF_NONE: @DEFAULT_CACHE_LOG@ |
5345 | LOC: Debug::cache_log | |
5346 | DOC_START | |
638402dd AJ |
5347 | Squid administrative logging file. |
5348 | ||
5349 | This is where general information about Squid behavior goes. You can | |
5350 | increase the amount of data logged to this file and how often it is | |
5351 | rotated with "debug_options" | |
62493678 AJ |
5352 | DOC_END |
5353 | ||
5354 | NAME: debug_options | |
5355 | TYPE: eol | |
47df1aa7 | 5356 | DEFAULT: ALL,1 |
638402dd | 5357 | DEFAULT_DOC: Log all critical and important messages. |
62493678 AJ |
5358 | LOC: Debug::debugOptions |
5359 | DOC_START | |
5360 | Logging options are set as section,level where each source file | |
5361 | is assigned a unique section. Lower levels result in less | |
5362 | output, Full debugging (level 9) can result in a very large | |
5363 | log file, so be careful. | |
5364 | ||
5365 | The magic word "ALL" sets debugging levels for all sections. | |
638402dd | 5366 | The default is to run with "ALL,1" to record important warnings. |
62493678 | 5367 | |
47df1aa7 AJ |
5368 | The rotate=N option can be used to keep more or less of these logs |
5369 | than would otherwise be kept by logfile_rotate. | |
62493678 AJ |
5370 | For most uses a single log should be enough to monitor current |
5371 | events affecting Squid. | |
5372 | DOC_END | |
5373 | ||
5374 | NAME: coredump_dir | |
5375 | TYPE: string | |
5376 | LOC: Config.coredump_dir | |
62493678 | 5377 | DEFAULT_IF_NONE: none |
638402dd | 5378 | DEFAULT_DOC: Use the directory from where Squid was started. |
62493678 AJ |
5379 | DOC_START |
5380 | By default Squid leaves core files in the directory from where | |
5381 | it was started. If you set 'coredump_dir' to a directory | |
5382 | that exists, Squid will chdir() to that directory at startup | |
5383 | and coredump files will be left there. | |
5384 | ||
5385 | NOCOMMENT_START | |
e0855596 | 5386 | |
62493678 AJ |
5387 | # Leave coredumps in the first cache dir |
5388 | coredump_dir @DEFAULT_SWAP_DIR@ | |
5389 | NOCOMMENT_END | |
5390 | DOC_END | |
5391 | ||
5392 | ||
41bd17a4 | 5393 | COMMENT_START |
5394 | OPTIONS FOR FTP GATEWAYING | |
5395 | ----------------------------------------------------------------------------- | |
5396 | COMMENT_END | |
5397 | ||
5398 | NAME: ftp_user | |
5399 | TYPE: string | |
5400 | DEFAULT: Squid@ | |
5401 | LOC: Config.Ftp.anon_user | |
6b698a21 | 5402 | DOC_START |
41bd17a4 | 5403 | If you want the anonymous login password to be more informative |
638402dd | 5404 | (and enable the use of picky FTP servers), set this to something |
41bd17a4 | 5405 | reasonable for your domain, like wwwuser@somewhere.net |
7f7db318 | 5406 | |
41bd17a4 | 5407 | The reason why this is domainless by default is the |
5408 | request can be made on the behalf of a user in any domain, | |
5409 | depending on how the cache is used. | |
638402dd | 5410 | Some FTP server also validate the email address is valid |
41bd17a4 | 5411 | (for example perl.com). |
6b698a21 | 5412 | DOC_END |
0976f8db | 5413 | |
41bd17a4 | 5414 | NAME: ftp_passive |
5415 | TYPE: onoff | |
5416 | DEFAULT: on | |
5417 | LOC: Config.Ftp.passive | |
6b698a21 | 5418 | DOC_START |
41bd17a4 | 5419 | If your firewall does not allow Squid to use passive |
5420 | connections, turn off this option. | |
a689bd4e | 5421 | |
5422 | Use of ftp_epsv_all option requires this to be ON. | |
5423 | DOC_END | |
5424 | ||
5425 | NAME: ftp_epsv_all | |
5426 | TYPE: onoff | |
5427 | DEFAULT: off | |
5428 | LOC: Config.Ftp.epsv_all | |
5429 | DOC_START | |
5430 | FTP Protocol extensions permit the use of a special "EPSV ALL" command. | |
5431 | ||
5432 | NATs may be able to put the connection on a "fast path" through the | |
5433 | translator, as the EPRT command will never be used and therefore, | |
5434 | translation of the data portion of the segments will never be needed. | |
5435 | ||
b3567eb5 FC |
5436 | When a client only expects to do two-way FTP transfers this may be |
5437 | useful. | |
a689bd4e | 5438 | If squid finds that it must do a three-way FTP transfer after issuing |
5439 | an EPSV ALL command, the FTP session will fail. | |
5440 | ||
5441 | If you have any doubts about this option do not use it. | |
5442 | Squid will nicely attempt all other connection methods. | |
5443 | ||
51ee534d AJ |
5444 | Requires ftp_passive to be ON (default) for any effect. |
5445 | DOC_END | |
5446 | ||
5447 | NAME: ftp_epsv | |
ddf5aa2b CT |
5448 | TYPE: ftp_epsv |
5449 | DEFAULT: none | |
5450 | LOC: Config.accessList.ftp_epsv | |
51ee534d AJ |
5451 | DOC_START |
5452 | FTP Protocol extensions permit the use of a special "EPSV" command. | |
5453 | ||
5454 | NATs may be able to put the connection on a "fast path" through the | |
b3567eb5 FC |
5455 | translator using EPSV, as the EPRT command will never be used |
5456 | and therefore, translation of the data portion of the segments | |
5457 | will never be needed. | |
51ee534d | 5458 | |
ddf5aa2b CT |
5459 | EPSV is often required to interoperate with FTP servers on IPv6 |
5460 | networks. On the other hand, it may break some IPv4 servers. | |
5461 | ||
5462 | By default, EPSV may try EPSV with any FTP server. To fine tune | |
5463 | that decision, you may restrict EPSV to certain clients or servers | |
5464 | using ACLs: | |
5465 | ||
5466 | ftp_epsv allow|deny al1 acl2 ... | |
5467 | ||
5468 | WARNING: Disabling EPSV may cause problems with external NAT and IPv6. | |
51ee534d | 5469 | |
ddf5aa2b | 5470 | Only fast ACLs are supported. |
51ee534d | 5471 | Requires ftp_passive to be ON (default) for any effect. |
41bd17a4 | 5472 | DOC_END |
9e7dbc51 | 5473 | |
63ee5443 AJ |
5474 | NAME: ftp_eprt |
5475 | TYPE: onoff | |
5476 | DEFAULT: on | |
5477 | LOC: Config.Ftp.eprt | |
5478 | DOC_START | |
5479 | FTP Protocol extensions permit the use of a special "EPRT" command. | |
5480 | ||
5481 | This extension provides a protocol neutral alternative to the | |
5482 | IPv4-only PORT command. When supported it enables active FTP data | |
5483 | channels over IPv6 and efficient NAT handling. | |
5484 | ||
5485 | Turning this OFF will prevent EPRT being attempted and will skip | |
5486 | straight to using PORT for IPv4 servers. | |
5487 | ||
5488 | Some devices are known to not handle this extension correctly and | |
5489 | may result in crashes. Devices which suport EPRT enough to fail | |
5490 | cleanly will result in Squid attempting PORT anyway. This directive | |
5491 | should only be disabled when EPRT results in device failures. | |
5492 | ||
5493 | WARNING: Doing so will convert Squid back to the old behavior with all | |
5494 | the related problems with external NAT devices/layers and IPv4-only FTP. | |
5495 | DOC_END | |
5496 | ||
41bd17a4 | 5497 | NAME: ftp_sanitycheck |
5498 | TYPE: onoff | |
5499 | DEFAULT: on | |
5500 | LOC: Config.Ftp.sanitycheck | |
5501 | DOC_START | |
5502 | For security and data integrity reasons Squid by default performs | |
5503 | sanity checks of the addresses of FTP data connections ensure the | |
5504 | data connection is to the requested server. If you need to allow | |
5505 | FTP connections to servers using another IP address for the data | |
5506 | connection turn this off. | |
5507 | DOC_END | |
9e7dbc51 | 5508 | |
41bd17a4 | 5509 | NAME: ftp_telnet_protocol |
5510 | TYPE: onoff | |
5511 | DEFAULT: on | |
5512 | LOC: Config.Ftp.telnet | |
5513 | DOC_START | |
5514 | The FTP protocol is officially defined to use the telnet protocol | |
5515 | as transport channel for the control connection. However, many | |
5516 | implementations are broken and does not respect this aspect of | |
5517 | the FTP protocol. | |
5518 | ||
5519 | If you have trouble accessing files with ASCII code 255 in the | |
5520 | path or similar problems involving this ASCII code you can | |
5521 | try setting this directive to off. If that helps, report to the | |
5522 | operator of the FTP server in question that their FTP server | |
5523 | is broken and does not follow the FTP standard. | |
5524 | DOC_END | |
5525 | ||
5526 | COMMENT_START | |
5527 | OPTIONS FOR EXTERNAL SUPPORT PROGRAMS | |
5528 | ----------------------------------------------------------------------------- | |
5529 | COMMENT_END | |
5530 | ||
5531 | NAME: diskd_program | |
5532 | TYPE: string | |
5533 | DEFAULT: @DEFAULT_DISKD@ | |
5534 | LOC: Config.Program.diskd | |
5535 | DOC_START | |
5536 | Specify the location of the diskd executable. | |
5537 | Note this is only useful if you have compiled in | |
5538 | diskd as one of the store io modules. | |
5539 | DOC_END | |
5540 | ||
5541 | NAME: unlinkd_program | |
5542 | IFDEF: USE_UNLINKD | |
5543 | TYPE: string | |
5544 | DEFAULT: @DEFAULT_UNLINKD@ | |
5545 | LOC: Config.Program.unlinkd | |
5546 | DOC_START | |
5547 | Specify the location of the executable for file deletion process. | |
5548 | DOC_END | |
5549 | ||
5550 | NAME: pinger_program | |
41bd17a4 | 5551 | IFDEF: USE_ICMP |
7a9d36e3 AJ |
5552 | TYPE: icmp |
5553 | DEFAULT: @DEFAULT_PINGER@ | |
5554 | LOC: IcmpCfg | |
41bd17a4 | 5555 | DOC_START |
5556 | Specify the location of the executable for the pinger process. | |
5557 | DOC_END | |
5558 | ||
cc192b50 | 5559 | NAME: pinger_enable |
5560 | TYPE: onoff | |
5561 | DEFAULT: on | |
7a9d36e3 | 5562 | LOC: IcmpCfg.enable |
cc192b50 | 5563 | IFDEF: USE_ICMP |
5564 | DOC_START | |
5565 | Control whether the pinger is active at run-time. | |
b3567eb5 FC |
5566 | Enables turning ICMP pinger on and off with a simple |
5567 | squid -k reconfigure. | |
cc192b50 | 5568 | DOC_END |
5569 | ||
5570 | ||
41bd17a4 | 5571 | COMMENT_START |
5572 | OPTIONS FOR URL REWRITING | |
5573 | ----------------------------------------------------------------------------- | |
5574 | COMMENT_END | |
5575 | ||
5576 | NAME: url_rewrite_program redirect_program | |
5577 | TYPE: wordlist | |
5578 | LOC: Config.Program.redirect | |
5579 | DEFAULT: none | |
5580 | DOC_START | |
2c7aad89 | 5581 | Specify the location of the executable URL rewriter to use. |
41bd17a4 | 5582 | Since they can perform almost any function there isn't one included. |
5583 | ||
2c7aad89 | 5584 | For each requested URL, the rewriter will receive on line with the format |
41bd17a4 | 5585 | |
b11724bb | 5586 | [channel-ID <SP>] URL [<SP> extras]<NL> |
5269ec0e | 5587 | |
457857fe CT |
5588 | See url_rewrite_extras on how to send "extras" with optional values to |
5589 | the helper. | |
5269ec0e AJ |
5590 | After processing the request the helper must reply using the following format: |
5591 | ||
24eac830 | 5592 | [channel-ID <SP>] result [<SP> kv-pairs] |
5269ec0e AJ |
5593 | |
5594 | The result code can be: | |
5595 | ||
5596 | OK status=30N url="..." | |
5597 | Redirect the URL to the one supplied in 'url='. | |
5598 | 'status=' is optional and contains the status code to send | |
5599 | the client in Squids HTTP response. It must be one of the | |
5600 | HTTP redirect status codes: 301, 302, 303, 307, 308. | |
5601 | When no status is given Squid will use 302. | |
c71adec1 | 5602 | |
5269ec0e AJ |
5603 | OK rewrite-url="..." |
5604 | Rewrite the URL to the one supplied in 'rewrite-url='. | |
5605 | The new URL is fetched directly by Squid and returned to | |
5606 | the client as the response to its request. | |
5607 | ||
c2cbbb02 AJ |
5608 | OK |
5609 | When neither of url= and rewrite-url= are sent Squid does | |
5610 | not change the URL. | |
5611 | ||
5269ec0e AJ |
5612 | ERR |
5613 | Do not change the URL. | |
5614 | ||
5615 | BH | |
4ded749e | 5616 | An internal error occurred in the helper, preventing |
c2cbbb02 AJ |
5617 | a result being identified. The 'message=' key name is |
5618 | reserved for delivering a log message. | |
5269ec0e AJ |
5619 | |
5620 | ||
457857fe CT |
5621 | In addition to the above kv-pairs Squid also understands the following |
5622 | optional kv-pairs received from URL rewriters: | |
5623 | clt_conn_tag=TAG | |
5624 | Associates a TAG with the client TCP connection. | |
5625 | The TAG is treated as a regular annotation but persists across | |
5626 | future requests on the client connection rather than just the | |
5627 | current request. A helper may update the TAG during subsequent | |
5628 | requests be returning a new kv-pair. | |
41bd17a4 | 5629 | |
5269ec0e AJ |
5630 | When using the concurrency= option the protocol is changed by |
5631 | introducing a query channel tag in front of the request/response. | |
5632 | The query channel tag is a number between 0 and concurrency-1. | |
5633 | This value must be echoed back unchanged to Squid as the first part | |
5634 | of the response relating to its request. | |
5635 | ||
5636 | WARNING: URL re-writing ability should be avoided whenever possible. | |
5637 | Use the URL redirect form of response instead. | |
41bd17a4 | 5638 | |
5269ec0e AJ |
5639 | Re-write creates a difference in the state held by the client |
5640 | and server. Possibly causing confusion when the server response | |
5641 | contains snippets of its view state. Embeded URLs, response | |
5642 | and content Location headers, etc. are not re-written by this | |
5643 | interface. | |
41bd17a4 | 5644 | |
5645 | By default, a URL rewriter is not used. | |
5646 | DOC_END | |
5647 | ||
5648 | NAME: url_rewrite_children redirect_children | |
48d54e4d | 5649 | TYPE: HelperChildConfig |
5b708d95 | 5650 | DEFAULT: 20 startup=0 idle=1 concurrency=0 |
41bd17a4 | 5651 | LOC: Config.redirectChildren |
5652 | DOC_START | |
79933cd6 AR |
5653 | Specifies the maximum number of redirector processes that Squid may |
5654 | spawn (numberofchildren) and several related options. Using too few of | |
5655 | these helper processes (a.k.a. "helpers") creates request queues. | |
5656 | Using too many helpers wastes your system resources. | |
5657 | ||
5658 | Usage: numberofchildren [option]... | |
5659 | ||
48d54e4d AJ |
5660 | The startup= and idle= options allow some measure of skew in your |
5661 | tuning. | |
5662 | ||
5663 | startup= | |
5664 | ||
5665 | Sets a minimum of how many processes are to be spawned when Squid | |
5666 | starts or reconfigures. When set to zero the first request will | |
5667 | cause spawning of the first child process to handle it. | |
5668 | ||
5669 | Starting too few will cause an initial slowdown in traffic as Squid | |
5670 | attempts to simultaneously spawn enough processes to cope. | |
5671 | ||
5672 | idle= | |
5673 | ||
5674 | Sets a minimum of how many processes Squid is to try and keep available | |
5675 | at all times. When traffic begins to rise above what the existing | |
5676 | processes can handle this many more will be spawned up to the maximum | |
5677 | configured. A minimum setting of 1 is required. | |
5678 | ||
5679 | concurrency= | |
41bd17a4 | 5680 | |
41bd17a4 | 5681 | The number of requests each redirector helper can handle in |
5682 | parallel. Defaults to 0 which indicates the redirector | |
5683 | is a old-style single threaded redirector. | |
6a171502 AJ |
5684 | |
5685 | When this directive is set to a value >= 1 then the protocol | |
5686 | used to communicate with the helper is modified to include | |
9bef05b1 AJ |
5687 | an ID in front of the request/response. The ID from the request |
5688 | must be echoed back with the response to that request. | |
6825b101 CT |
5689 | |
5690 | queue-size=N | |
5691 | ||
79933cd6 AR |
5692 | Sets the maximum number of queued requests. A request is queued when |
5693 | no existing child can accept it due to concurrency limit and no new | |
5694 | child can be started due to numberofchildren limit. The default | |
5695 | maximum is zero if url_rewrite_bypass is enabled and | |
5696 | 2*numberofchildren otherwise. If the queued requests exceed queue size | |
5697 | and redirector_bypass configuration option is set, then redirector is | |
5698 | bypassed. Otherwise, Squid is allowed to temporarily exceed the | |
5699 | configured maximum, marking the affected helper as "overloaded". If | |
5700 | the helper overload lasts more than 3 minutes, the action prescribed | |
5701 | by the on-persistent-overload option applies. | |
6082a0e2 EB |
5702 | |
5703 | on-persistent-overload=action | |
5704 | ||
5705 | Specifies Squid reaction to a new helper request arriving when the helper | |
5706 | has been overloaded for more that 3 minutes already. The number of queued | |
5707 | requests determines whether the helper is overloaded (see the queue-size | |
5708 | option). | |
5709 | ||
5710 | Two actions are supported: | |
5711 | ||
5712 | die Squid worker quits. This is the default behavior. | |
5713 | ||
5714 | ERR Squid treats the helper request as if it was | |
5715 | immediately submitted, and the helper immediately | |
5716 | replied with an ERR response. This action has no effect | |
5717 | on the already queued and in-progress helper requests. | |
41bd17a4 | 5718 | DOC_END |
5719 | ||
5720 | NAME: url_rewrite_host_header redirect_rewrites_host_header | |
5721 | TYPE: onoff | |
5722 | DEFAULT: on | |
5723 | LOC: Config.onoff.redir_rewrites_host | |
5724 | DOC_START | |
3ce33807 AJ |
5725 | To preserve same-origin security policies in browsers and |
5726 | prevent Host: header forgery by redirectors Squid rewrites | |
5727 | any Host: header in redirected requests. | |
5728 | ||
5729 | If you are running an accelerator this may not be a wanted | |
5730 | effect of a redirector. This directive enables you disable | |
5731 | Host: alteration in reverse-proxy traffic. | |
5732 | ||
41bd17a4 | 5733 | WARNING: Entries are cached on the result of the URL rewriting |
5734 | process, so be careful if you have domain-virtual hosts. | |
3ce33807 AJ |
5735 | |
5736 | WARNING: Squid and other software verifies the URL and Host | |
5737 | are matching, so be careful not to relay through other proxies | |
5738 | or inspecting firewalls with this disabled. | |
41bd17a4 | 5739 | DOC_END |
5740 | ||
5741 | NAME: url_rewrite_access redirector_access | |
5742 | TYPE: acl_access | |
5743 | DEFAULT: none | |
638402dd | 5744 | DEFAULT_DOC: Allow, unless rules exist in squid.conf. |
41bd17a4 | 5745 | LOC: Config.accessList.redirector |
5746 | DOC_START | |
5747 | If defined, this access list specifies which requests are | |
638402dd | 5748 | sent to the redirector processes. |
b3567eb5 FC |
5749 | |
5750 | This clause supports both fast and slow acl types. | |
5751 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
41bd17a4 | 5752 | DOC_END |
5753 | ||
5754 | NAME: url_rewrite_bypass redirector_bypass | |
5755 | TYPE: onoff | |
5756 | LOC: Config.onoff.redirector_bypass | |
5757 | DEFAULT: off | |
5758 | DOC_START | |
5759 | When this is 'on', a request will not go through the | |
6082a0e2 EB |
5760 | redirector if all the helpers are busy. If this is 'off' and the |
5761 | redirector queue grows too large, the action is prescribed by the | |
5762 | on-persistent-overload option. You should only enable this if the | |
5763 | redirectors are not critical to your caching system. If you use | |
41bd17a4 | 5764 | redirectors for access control, and you enable this option, |
5765 | users may have access to pages they should not | |
5766 | be allowed to request. | |
79933cd6 AR |
5767 | |
5768 | Enabling this option sets the default url_rewrite_children queue-size | |
5769 | option value to 0. | |
41bd17a4 | 5770 | DOC_END |
5771 | ||
fe7966ec | 5772 | NAME: url_rewrite_extras |
b11724bb CT |
5773 | TYPE: TokenOrQuotedString |
5774 | LOC: Config.redirector_extras | |
5775 | DEFAULT: "%>a/%>A %un %>rm myip=%la myport=%lp" | |
5776 | DOC_START | |
5777 | Specifies a string to be append to request line format for the | |
5778 | rewriter helper. "Quoted" format values may contain spaces and | |
5779 | logformat %macros. In theory, any logformat %macro can be used. | |
5780 | In practice, a %macro expands as a dash (-) if the helper request is | |
5781 | sent before the required macro information is available to Squid. | |
5782 | DOC_END | |
5783 | ||
32fd6d8a | 5784 | NAME: url_rewrite_timeout |
ced8def3 AJ |
5785 | TYPE: UrlHelperTimeout |
5786 | LOC: Config.onUrlRewriteTimeout | |
32fd6d8a CT |
5787 | DEFAULT: none |
5788 | DEFAULT_DOC: Squid waits for the helper response forever | |
5789 | DOC_START | |
5790 | Squid times active requests to redirector. The timeout value and Squid | |
5791 | reaction to a timed out request are configurable using the following | |
5792 | format: | |
5793 | ||
ced8def3 | 5794 | url_rewrite_timeout timeout time-units on_timeout=<action> [response=<quoted-response>] |
32fd6d8a CT |
5795 | |
5796 | supported timeout actions: | |
ced8def3 | 5797 | fail Squid return a ERR_GATEWAY_FAILURE error page |
32fd6d8a | 5798 | |
ced8def3 | 5799 | bypass Do not re-write the URL |
32fd6d8a | 5800 | |
ced8def3 | 5801 | retry Send the lookup to the helper again |
32fd6d8a | 5802 | |
ced8def3 AJ |
5803 | use_configured_response |
5804 | Use the <quoted-response> as helper response | |
32fd6d8a CT |
5805 | DOC_END |
5806 | ||
a8a0b1c2 EC |
5807 | COMMENT_START |
5808 | OPTIONS FOR STORE ID | |
5809 | ----------------------------------------------------------------------------- | |
5810 | COMMENT_END | |
5811 | ||
5812 | NAME: store_id_program storeurl_rewrite_program | |
5813 | TYPE: wordlist | |
5814 | LOC: Config.Program.store_id | |
5815 | DEFAULT: none | |
5816 | DOC_START | |
5817 | Specify the location of the executable StoreID helper to use. | |
5818 | Since they can perform almost any function there isn't one included. | |
5819 | ||
5820 | For each requested URL, the helper will receive one line with the format | |
5821 | ||
b11724bb | 5822 | [channel-ID <SP>] URL [<SP> extras]<NL> |
a8a0b1c2 EC |
5823 | |
5824 | ||
5825 | After processing the request the helper must reply using the following format: | |
5826 | ||
5827 | [channel-ID <SP>] result [<SP> kv-pairs] | |
5828 | ||
5829 | The result code can be: | |
5830 | ||
5831 | OK store-id="..." | |
5832 | Use the StoreID supplied in 'store-id='. | |
5833 | ||
5834 | ERR | |
5835 | The default is to use HTTP request URL as the store ID. | |
5836 | ||
5837 | BH | |
61beade2 | 5838 | An internal error occurred in the helper, preventing |
a8a0b1c2 EC |
5839 | a result being identified. |
5840 | ||
457857fe CT |
5841 | In addition to the above kv-pairs Squid also understands the following |
5842 | optional kv-pairs received from URL rewriters: | |
5843 | clt_conn_tag=TAG | |
5844 | Associates a TAG with the client TCP connection. | |
5845 | Please see url_rewrite_program related documentation for this | |
5846 | kv-pair | |
a8a0b1c2 | 5847 | |
b11724bb CT |
5848 | Helper programs should be prepared to receive and possibly ignore |
5849 | additional whitespace-separated tokens on each input line. | |
a8a0b1c2 EC |
5850 | |
5851 | When using the concurrency= option the protocol is changed by | |
5852 | introducing a query channel tag in front of the request/response. | |
5853 | The query channel tag is a number between 0 and concurrency-1. | |
5854 | This value must be echoed back unchanged to Squid as the first part | |
5855 | of the response relating to its request. | |
5856 | ||
5857 | NOTE: when using StoreID refresh_pattern will apply to the StoreID | |
5858 | returned from the helper and not the URL. | |
5859 | ||
5860 | WARNING: Wrong StoreID value returned by a careless helper may result | |
5861 | in the wrong cached response returned to the user. | |
5862 | ||
5863 | By default, a StoreID helper is not used. | |
5864 | DOC_END | |
5865 | ||
fe7966ec | 5866 | NAME: store_id_extras |
b11724bb CT |
5867 | TYPE: TokenOrQuotedString |
5868 | LOC: Config.storeId_extras | |
5869 | DEFAULT: "%>a/%>A %un %>rm myip=%la myport=%lp" | |
5870 | DOC_START | |
5871 | Specifies a string to be append to request line format for the | |
5872 | StoreId helper. "Quoted" format values may contain spaces and | |
5873 | logformat %macros. In theory, any logformat %macro can be used. | |
5874 | In practice, a %macro expands as a dash (-) if the helper request is | |
5875 | sent before the required macro information is available to Squid. | |
5876 | DOC_END | |
5877 | ||
a8a0b1c2 EC |
5878 | NAME: store_id_children storeurl_rewrite_children |
5879 | TYPE: HelperChildConfig | |
5880 | DEFAULT: 20 startup=0 idle=1 concurrency=0 | |
5881 | LOC: Config.storeIdChildren | |
5882 | DOC_START | |
79933cd6 AR |
5883 | Specifies the maximum number of StoreID helper processes that Squid |
5884 | may spawn (numberofchildren) and several related options. Using | |
5885 | too few of these helper processes (a.k.a. "helpers") creates request | |
5886 | queues. Using too many helpers wastes your system resources. | |
5887 | ||
5888 | Usage: numberofchildren [option]... | |
a8a0b1c2 EC |
5889 | |
5890 | The startup= and idle= options allow some measure of skew in your | |
5891 | tuning. | |
5892 | ||
5893 | startup= | |
5894 | ||
5895 | Sets a minimum of how many processes are to be spawned when Squid | |
5896 | starts or reconfigures. When set to zero the first request will | |
5897 | cause spawning of the first child process to handle it. | |
5898 | ||
5899 | Starting too few will cause an initial slowdown in traffic as Squid | |
5900 | attempts to simultaneously spawn enough processes to cope. | |
5901 | ||
5902 | idle= | |
5903 | ||
5904 | Sets a minimum of how many processes Squid is to try and keep available | |
5905 | at all times. When traffic begins to rise above what the existing | |
5906 | processes can handle this many more will be spawned up to the maximum | |
5907 | configured. A minimum setting of 1 is required. | |
5908 | ||
5909 | concurrency= | |
5910 | ||
5911 | The number of requests each storeID helper can handle in | |
5912 | parallel. Defaults to 0 which indicates the helper | |
5913 | is a old-style single threaded program. | |
5914 | ||
5915 | When this directive is set to a value >= 1 then the protocol | |
5916 | used to communicate with the helper is modified to include | |
5917 | an ID in front of the request/response. The ID from the request | |
5918 | must be echoed back with the response to that request. | |
6825b101 CT |
5919 | |
5920 | queue-size=N | |
5921 | ||
79933cd6 AR |
5922 | Sets the maximum number of queued requests to N. A request is queued |
5923 | when no existing child can accept it due to concurrency limit and no | |
5924 | new child can be started due to numberofchildren limit. The default | |
5925 | maximum is 2*numberofchildren. If the queued requests exceed queue | |
5926 | size and redirector_bypass configuration option is set, then | |
5927 | redirector is bypassed. Otherwise, Squid is allowed to temporarily | |
5928 | exceed the configured maximum, marking the affected helper as | |
5929 | "overloaded". If the helper overload lasts more than 3 minutes, the | |
5930 | action prescribed by the on-persistent-overload option applies. | |
6082a0e2 EB |
5931 | |
5932 | on-persistent-overload=action | |
5933 | ||
5934 | Specifies Squid reaction to a new helper request arriving when the helper | |
5935 | has been overloaded for more that 3 minutes already. The number of queued | |
5936 | requests determines whether the helper is overloaded (see the queue-size | |
5937 | option). | |
5938 | ||
5939 | Two actions are supported: | |
5940 | ||
5941 | die Squid worker quits. This is the default behavior. | |
5942 | ||
5943 | ERR Squid treats the helper request as if it was | |
5944 | immediately submitted, and the helper immediately | |
5945 | replied with an ERR response. This action has no effect | |
5946 | on the already queued and in-progress helper requests. | |
a8a0b1c2 EC |
5947 | DOC_END |
5948 | ||
5949 | NAME: store_id_access storeurl_rewrite_access | |
5950 | TYPE: acl_access | |
5951 | DEFAULT: none | |
638402dd | 5952 | DEFAULT_DOC: Allow, unless rules exist in squid.conf. |
a8a0b1c2 EC |
5953 | LOC: Config.accessList.store_id |
5954 | DOC_START | |
5955 | If defined, this access list specifies which requests are | |
5956 | sent to the StoreID processes. By default all requests | |
5957 | are sent. | |
5958 | ||
5959 | This clause supports both fast and slow acl types. | |
5960 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
5961 | DOC_END | |
5962 | ||
5963 | NAME: store_id_bypass storeurl_rewrite_bypass | |
5964 | TYPE: onoff | |
5965 | LOC: Config.onoff.store_id_bypass | |
5966 | DEFAULT: on | |
5967 | DOC_START | |
5968 | When this is 'on', a request will not go through the | |
6082a0e2 EB |
5969 | helper if all helpers are busy. If this is 'off' and the helper |
5970 | queue grows too large, the action is prescribed by the | |
5971 | on-persistent-overload option. You should only enable this if the | |
5972 | helpers are not critical to your caching system. If you use | |
a8a0b1c2 EC |
5973 | helpers for critical caching components, and you enable this |
5974 | option, users may not get objects from cache. | |
6825b101 CT |
5975 | This options sets default queue-size option of the store_id_children |
5976 | to 0. | |
a8a0b1c2 EC |
5977 | DOC_END |
5978 | ||
41bd17a4 | 5979 | COMMENT_START |
5980 | OPTIONS FOR TUNING THE CACHE | |
5981 | ----------------------------------------------------------------------------- | |
5982 | COMMENT_END | |
5983 | ||
f04b37d8 | 5984 | NAME: cache no_cache |
5985 | TYPE: acl_access | |
5986 | DEFAULT: none | |
70706149 | 5987 | DEFAULT_DOC: By default, this directive is unused and has no effect. |
f04b37d8 | 5988 | LOC: Config.accessList.noCache |
41bd17a4 | 5989 | DOC_START |
70706149 AR |
5990 | Requests denied by this directive will not be served from the cache |
5991 | and their responses will not be stored in the cache. This directive | |
5992 | has no effect on other transactions and on already cached responses. | |
f04b37d8 | 5993 | |
b3567eb5 FC |
5994 | This clause supports both fast and slow acl types. |
5995 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
70706149 AR |
5996 | |
5997 | This and the two other similar caching directives listed below are | |
5998 | checked at different transaction processing stages, have different | |
5999 | access to response information, affect different cache operations, | |
6000 | and differ in slow ACLs support: | |
6001 | ||
6002 | * cache: Checked before Squid makes a hit/miss determination. | |
6003 | No access to reply information! | |
6004 | Denies both serving a hit and storing a miss. | |
6005 | Supports both fast and slow ACLs. | |
6006 | * send_hit: Checked after a hit was detected. | |
6007 | Has access to reply (hit) information. | |
6008 | Denies serving a hit only. | |
6009 | Supports fast ACLs only. | |
6010 | * store_miss: Checked before storing a cachable miss. | |
6011 | Has access to reply (miss) information. | |
6012 | Denies storing a miss only. | |
6013 | Supports fast ACLs only. | |
6014 | ||
6015 | If you are not sure which of the three directives to use, apply the | |
6016 | following decision logic: | |
6017 | ||
6018 | * If your ACL(s) are of slow type _and_ need response info, redesign. | |
6019 | Squid does not support that particular combination at this time. | |
6020 | Otherwise: | |
6021 | * If your directive ACL(s) are of slow type, use "cache"; and/or | |
6022 | * if your directive ACL(s) need no response info, use "cache". | |
6023 | Otherwise: | |
6024 | * If you do not want the response cached, use store_miss; and/or | |
6025 | * if you do not want a hit on a cached response, use send_hit. | |
6026 | DOC_END | |
6027 | ||
6028 | NAME: send_hit | |
6029 | TYPE: acl_access | |
6030 | DEFAULT: none | |
6031 | DEFAULT_DOC: By default, this directive is unused and has no effect. | |
6032 | LOC: Config.accessList.sendHit | |
6033 | DOC_START | |
6034 | Responses denied by this directive will not be served from the cache | |
6035 | (but may still be cached, see store_miss). This directive has no | |
6036 | effect on the responses it allows and on the cached objects. | |
6037 | ||
6038 | Please see the "cache" directive for a summary of differences among | |
6039 | store_miss, send_hit, and cache directives. | |
6040 | ||
6041 | Unlike the "cache" directive, send_hit only supports fast acl | |
6042 | types. See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
6043 | ||
6044 | For example: | |
6045 | ||
6046 | # apply custom Store ID mapping to some URLs | |
6047 | acl MapMe dstdomain .c.example.com | |
6048 | store_id_program ... | |
6049 | store_id_access allow MapMe | |
6050 | ||
6051 | # but prevent caching of special responses | |
6052 | # such as 302 redirects that cause StoreID loops | |
6053 | acl Ordinary http_status 200-299 | |
6054 | store_miss deny MapMe !Ordinary | |
6055 | ||
6056 | # and do not serve any previously stored special responses | |
6057 | # from the cache (in case they were already cached before | |
6058 | # the above store_miss rule was in effect). | |
6059 | send_hit deny MapMe !Ordinary | |
6060 | DOC_END | |
6061 | ||
6062 | NAME: store_miss | |
6063 | TYPE: acl_access | |
6064 | DEFAULT: none | |
6065 | DEFAULT_DOC: By default, this directive is unused and has no effect. | |
6066 | LOC: Config.accessList.storeMiss | |
6067 | DOC_START | |
6068 | Responses denied by this directive will not be cached (but may still | |
6069 | be served from the cache, see send_hit). This directive has no | |
6070 | effect on the responses it allows and on the already cached responses. | |
6071 | ||
6072 | Please see the "cache" directive for a summary of differences among | |
6073 | store_miss, send_hit, and cache directives. See the | |
6074 | send_hit directive for a usage example. | |
6075 | ||
6076 | Unlike the "cache" directive, store_miss only supports fast acl | |
6077 | types. See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
41bd17a4 | 6078 | DOC_END |
6079 | ||
570d3f75 AJ |
6080 | NAME: max_stale |
6081 | COMMENT: time-units | |
6082 | TYPE: time_t | |
6083 | LOC: Config.maxStale | |
6084 | DEFAULT: 1 week | |
6085 | DOC_START | |
6086 | This option puts an upper limit on how stale content Squid | |
6087 | will serve from the cache if cache validation fails. | |
6088 | Can be overriden by the refresh_pattern max-stale option. | |
6089 | DOC_END | |
6090 | ||
41bd17a4 | 6091 | NAME: refresh_pattern |
6092 | TYPE: refreshpattern | |
6093 | LOC: Config.Refresh | |
6094 | DEFAULT: none | |
6095 | DOC_START | |
6096 | usage: refresh_pattern [-i] regex min percent max [options] | |
9e7dbc51 | 6097 | |
6b698a21 | 6098 | By default, regular expressions are CASE-SENSITIVE. To make |
6099 | them case-insensitive, use the -i option. | |
9e7dbc51 | 6100 | |
41bd17a4 | 6101 | 'Min' is the time (in minutes) an object without an explicit |
6102 | expiry time should be considered fresh. The recommended | |
6103 | value is 0, any higher values may cause dynamic applications | |
6104 | to be erroneously cached unless the application designer | |
6105 | has taken the appropriate actions. | |
9e7dbc51 | 6106 | |
41bd17a4 | 6107 | 'Percent' is a percentage of the objects age (time since last |
6108 | modification age) an object without explicit expiry time | |
6109 | will be considered fresh. | |
5b807763 | 6110 | |
41bd17a4 | 6111 | 'Max' is an upper limit on how long objects without an explicit |
6d612a9d GD |
6112 | expiry time will be considered fresh. The value is also used |
6113 | to form Cache-Control: max-age header for a request sent from | |
6114 | Squid to origin/parent. | |
9e7dbc51 | 6115 | |
41bd17a4 | 6116 | options: override-expire |
6117 | override-lastmod | |
6118 | reload-into-ims | |
6119 | ignore-reload | |
41bd17a4 | 6120 | ignore-no-store |
6121 | ignore-private | |
570d3f75 | 6122 | max-stale=NN |
41bd17a4 | 6123 | refresh-ims |
3d8b6ba4 | 6124 | store-stale |
a0ec9f68 | 6125 | |
41bd17a4 | 6126 | override-expire enforces min age even if the server |
9b2ad080 HN |
6127 | sent an explicit expiry time (e.g., with the |
6128 | Expires: header or Cache-Control: max-age). Doing this | |
6129 | VIOLATES the HTTP standard. Enabling this feature | |
6130 | could make you liable for problems which it causes. | |
6468fe10 | 6131 | |
04925576 AJ |
6132 | Note: override-expire does not enforce staleness - it only extends |
6133 | freshness / min. If the server returns a Expires time which | |
6134 | is longer than your max time, Squid will still consider | |
6135 | the object fresh for that period of time. | |
6136 | ||
41bd17a4 | 6137 | override-lastmod enforces min age even on objects |
6138 | that were modified recently. | |
934b03fc | 6139 | |
46017fdd CT |
6140 | reload-into-ims changes a client no-cache or ``reload'' |
6141 | request for a cached entry into a conditional request using | |
6142 | If-Modified-Since and/or If-None-Match headers, provided the | |
6143 | cached entry has a Last-Modified and/or a strong ETag header. | |
6144 | Doing this VIOLATES the HTTP standard. Enabling this feature | |
6145 | could make you liable for problems which it causes. | |
dba79ac5 | 6146 | |
41bd17a4 | 6147 | ignore-reload ignores a client no-cache or ``reload'' |
6148 | header. Doing this VIOLATES the HTTP standard. Enabling | |
6149 | this feature could make you liable for problems which | |
6150 | it causes. | |
9bc73deb | 6151 | |
41bd17a4 | 6152 | ignore-no-store ignores any ``Cache-control: no-store'' |
6153 | headers received from a server. Doing this VIOLATES | |
6154 | the HTTP standard. Enabling this feature could make you | |
6155 | liable for problems which it causes. | |
6156 | ||
6157 | ignore-private ignores any ``Cache-control: private'' | |
6158 | headers received from a server. Doing this VIOLATES | |
6159 | the HTTP standard. Enabling this feature could make you | |
6160 | liable for problems which it causes. | |
6161 | ||
41bd17a4 | 6162 | refresh-ims causes squid to contact the origin server |
6163 | when a client issues an If-Modified-Since request. This | |
6164 | ensures that the client will receive an updated version | |
6165 | if one is available. | |
6166 | ||
3d8b6ba4 AJ |
6167 | store-stale stores responses even if they don't have explicit |
6168 | freshness or a validator (i.e., Last-Modified or an ETag) | |
6169 | present, or if they're already stale. By default, Squid will | |
6170 | not cache such responses because they usually can't be | |
6171 | reused. Note that such responses will be stale by default. | |
6172 | ||
570d3f75 AJ |
6173 | max-stale=NN provide a maximum staleness factor. Squid won't |
6174 | serve objects more stale than this even if it failed to | |
6175 | validate the object. Default: use the max_stale global limit. | |
6176 | ||
41bd17a4 | 6177 | Basically a cached object is: |
6178 | ||
fb41bbb2 | 6179 | FRESH if expire > now, else STALE |
41bd17a4 | 6180 | STALE if age > max |
6181 | FRESH if lm-factor < percent, else STALE | |
6182 | FRESH if age < min | |
6183 | else STALE | |
6184 | ||
6185 | The refresh_pattern lines are checked in the order listed here. | |
6186 | The first entry which matches is used. If none of the entries | |
6187 | match the default will be used. | |
6188 | ||
6189 | Note, you must uncomment all the default lines if you want | |
6190 | to change one. The default setting is only active if none is | |
6191 | used. | |
6192 | ||
41bd17a4 | 6193 | NOCOMMENT_START |
e0855596 | 6194 | |
638402dd | 6195 | # |
e0855596 | 6196 | # Add any of your own refresh_pattern entries above these. |
638402dd | 6197 | # |
41bd17a4 | 6198 | refresh_pattern ^ftp: 1440 20% 10080 |
6199 | refresh_pattern ^gopher: 1440 0% 1440 | |
89db45fa | 6200 | refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 |
41bd17a4 | 6201 | refresh_pattern . 0 20% 4320 |
6202 | NOCOMMENT_END | |
6203 | DOC_END | |
6204 | ||
6205 | NAME: quick_abort_min | |
6206 | COMMENT: (KB) | |
6207 | TYPE: kb_int64_t | |
6208 | DEFAULT: 16 KB | |
6209 | LOC: Config.quickAbort.min | |
6210 | DOC_NONE | |
6211 | ||
6212 | NAME: quick_abort_max | |
6213 | COMMENT: (KB) | |
6214 | TYPE: kb_int64_t | |
6215 | DEFAULT: 16 KB | |
6216 | LOC: Config.quickAbort.max | |
6217 | DOC_NONE | |
6218 | ||
6219 | NAME: quick_abort_pct | |
6220 | COMMENT: (percent) | |
6221 | TYPE: int | |
6222 | DEFAULT: 95 | |
6223 | LOC: Config.quickAbort.pct | |
6224 | DOC_START | |
6225 | The cache by default continues downloading aborted requests | |
6226 | which are almost completed (less than 16 KB remaining). This | |
6227 | may be undesirable on slow (e.g. SLIP) links and/or very busy | |
6228 | caches. Impatient users may tie up file descriptors and | |
6229 | bandwidth by repeatedly requesting and immediately aborting | |
6230 | downloads. | |
6231 | ||
6232 | When the user aborts a request, Squid will check the | |
2d4eefd9 | 6233 | quick_abort values to the amount of data transferred until |
41bd17a4 | 6234 | then. |
6235 | ||
6236 | If the transfer has less than 'quick_abort_min' KB remaining, | |
6237 | it will finish the retrieval. | |
6238 | ||
6239 | If the transfer has more than 'quick_abort_max' KB remaining, | |
6240 | it will abort the retrieval. | |
6241 | ||
6242 | If more than 'quick_abort_pct' of the transfer has completed, | |
6243 | it will finish the retrieval. | |
6244 | ||
6245 | If you do not want any retrieval to continue after the client | |
6246 | has aborted, set both 'quick_abort_min' and 'quick_abort_max' | |
6247 | to '0 KB'. | |
6248 | ||
6249 | If you want retrievals to always continue if they are being | |
6250 | cached set 'quick_abort_min' to '-1 KB'. | |
6251 | DOC_END | |
60d096f4 | 6252 | |
41bd17a4 | 6253 | NAME: read_ahead_gap |
6254 | COMMENT: buffer-size | |
6255 | TYPE: b_int64_t | |
6256 | LOC: Config.readAheadGap | |
6257 | DEFAULT: 16 KB | |
6258 | DOC_START | |
6259 | The amount of data the cache will buffer ahead of what has been | |
6260 | sent to the client when retrieving an object from another server. | |
6261 | DOC_END | |
53e738c6 | 6262 | |
41bd17a4 | 6263 | NAME: negative_ttl |
626096be | 6264 | IFDEF: USE_HTTP_VIOLATIONS |
41bd17a4 | 6265 | COMMENT: time-units |
6266 | TYPE: time_t | |
6267 | LOC: Config.negativeTtl | |
ac9cc053 | 6268 | DEFAULT: 0 seconds |
41bd17a4 | 6269 | DOC_START |
ac9cc053 AJ |
6270 | Set the Default Time-to-Live (TTL) for failed requests. |
6271 | Certain types of failures (such as "connection refused" and | |
6272 | "404 Not Found") are able to be negatively-cached for a short time. | |
6273 | Modern web servers should provide Expires: header, however if they | |
6274 | do not this can provide a minimum TTL. | |
6275 | The default is not to cache errors with unknown expiry details. | |
6276 | ||
6277 | Note that this is different from negative caching of DNS lookups. | |
39956c7c AJ |
6278 | |
6279 | WARNING: Doing this VIOLATES the HTTP standard. Enabling | |
6280 | this feature could make you liable for problems which it | |
6281 | causes. | |
41bd17a4 | 6282 | DOC_END |
53e738c6 | 6283 | |
41bd17a4 | 6284 | NAME: positive_dns_ttl |
6285 | COMMENT: time-units | |
6286 | TYPE: time_t | |
6287 | LOC: Config.positiveDnsTtl | |
6288 | DEFAULT: 6 hours | |
6289 | DOC_START | |
6290 | Upper limit on how long Squid will cache positive DNS responses. | |
6291 | Default is 6 hours (360 minutes). This directive must be set | |
6292 | larger than negative_dns_ttl. | |
6293 | DOC_END | |
c4ab8329 | 6294 | |
41bd17a4 | 6295 | NAME: negative_dns_ttl |
6296 | COMMENT: time-units | |
6297 | TYPE: time_t | |
6298 | LOC: Config.negativeDnsTtl | |
6299 | DEFAULT: 1 minutes | |
6300 | DOC_START | |
6301 | Time-to-Live (TTL) for negative caching of failed DNS lookups. | |
6302 | This also sets the lower cache limit on positive lookups. | |
6303 | Minimum value is 1 second, and it is not recommendable to go | |
6304 | much below 10 seconds. | |
6305 | DOC_END | |
7df0bfd7 | 6306 | |
41bd17a4 | 6307 | NAME: range_offset_limit |
11e3fa1c AJ |
6308 | COMMENT: size [acl acl...] |
6309 | TYPE: acl_b_size_t | |
41bd17a4 | 6310 | LOC: Config.rangeOffsetLimit |
11e3fa1c | 6311 | DEFAULT: none |
41bd17a4 | 6312 | DOC_START |
11e3fa1c AJ |
6313 | usage: (size) [units] [[!]aclname] |
6314 | ||
6315 | Sets an upper limit on how far (number of bytes) into the file | |
6316 | a Range request may be to cause Squid to prefetch the whole file. | |
6317 | If beyond this limit, Squid forwards the Range request as it is and | |
6318 | the result is NOT cached. | |
6319 | ||
41bd17a4 | 6320 | This is to stop a far ahead range request (lets say start at 17MB) |
6321 | from making Squid fetch the whole object up to that point before | |
6322 | sending anything to the client. | |
11e3fa1c AJ |
6323 | |
6324 | Multiple range_offset_limit lines may be specified, and they will | |
6325 | be searched from top to bottom on each request until a match is found. | |
6326 | The first match found will be used. If no line matches a request, the | |
6327 | default limit of 0 bytes will be used. | |
6328 | ||
6329 | 'size' is the limit specified as a number of units. | |
6330 | ||
6331 | 'units' specifies whether to use bytes, KB, MB, etc. | |
6332 | If no units are specified bytes are assumed. | |
6333 | ||
6334 | A size of 0 causes Squid to never fetch more than the | |
ab275c7b | 6335 | client requested. (default) |
11e3fa1c AJ |
6336 | |
6337 | A size of 'none' causes Squid to always fetch the object from the | |
41bd17a4 | 6338 | beginning so it may cache the result. (2.0 style) |
11e3fa1c AJ |
6339 | |
6340 | 'aclname' is the name of a defined ACL. | |
6341 | ||
6342 | NP: Using 'none' as the byte value here will override any quick_abort settings | |
6343 | that may otherwise apply to the range request. The range request will | |
ab275c7b AJ |
6344 | be fully fetched from start to finish regardless of the client |
6345 | actions. This affects bandwidth usage. | |
41bd17a4 | 6346 | DOC_END |
d95b862f | 6347 | |
41bd17a4 | 6348 | NAME: minimum_expiry_time |
6349 | COMMENT: (seconds) | |
6350 | TYPE: time_t | |
6351 | LOC: Config.minimum_expiry_time | |
6352 | DEFAULT: 60 seconds | |
6353 | DOC_START | |
6354 | The minimum caching time according to (Expires - Date) | |
638402dd AJ |
6355 | headers Squid honors if the object can't be revalidated. |
6356 | The default is 60 seconds. | |
6357 | ||
6358 | In reverse proxy environments it might be desirable to honor | |
6359 | shorter object lifetimes. It is most likely better to make | |
6360 | your server return a meaningful Last-Modified header however. | |
6361 | ||
6362 | In ESI environments where page fragments often have short | |
6363 | lifetimes, this will often be best set to 0. | |
41bd17a4 | 6364 | DOC_END |
c68e9c6b | 6365 | |
41bd17a4 | 6366 | NAME: store_avg_object_size |
58d5c5dd DK |
6367 | COMMENT: (bytes) |
6368 | TYPE: b_int64_t | |
41bd17a4 | 6369 | DEFAULT: 13 KB |
6370 | LOC: Config.Store.avgObjectSize | |
6371 | DOC_START | |
6372 | Average object size, used to estimate number of objects your | |
6373 | cache can hold. The default is 13 KB. | |
638402dd AJ |
6374 | |
6375 | This is used to pre-seed the cache index memory allocation to | |
6376 | reduce expensive reallocate operations while handling clients | |
6377 | traffic. Too-large values may result in memory allocation during | |
6378 | peak traffic, too-small values will result in wasted memory. | |
6379 | ||
6380 | Check the cache manager 'info' report metrics for the real | |
6381 | object sizes seen by your Squid before tuning this. | |
cccac0a2 | 6382 | DOC_END |
6383 | ||
41bd17a4 | 6384 | NAME: store_objects_per_bucket |
6385 | TYPE: int | |
6386 | DEFAULT: 20 | |
6387 | LOC: Config.Store.objectsPerBucket | |
6388 | DOC_START | |
6389 | Target number of objects per bucket in the store hash table. | |
6390 | Lowering this value increases the total number of buckets and | |
6391 | also the storage maintenance rate. The default is 20. | |
6392 | DOC_END | |
6393 | ||
6394 | COMMENT_START | |
6395 | HTTP OPTIONS | |
6396 | ----------------------------------------------------------------------------- | |
6397 | COMMENT_END | |
6398 | ||
f04b37d8 | 6399 | NAME: request_header_max_size |
6400 | COMMENT: (KB) | |
6401 | TYPE: b_size_t | |
df2eec10 | 6402 | DEFAULT: 64 KB |
f04b37d8 | 6403 | LOC: Config.maxRequestHeaderSize |
6404 | DOC_START | |
6405 | This specifies the maximum size for HTTP headers in a request. | |
6406 | Request headers are usually relatively small (about 512 bytes). | |
6407 | Placing a limit on the request header size will catch certain | |
6408 | bugs (for example with persistent connections) and possibly | |
6409 | buffer-overflow or denial-of-service attacks. | |
6410 | DOC_END | |
6411 | ||
6412 | NAME: reply_header_max_size | |
6413 | COMMENT: (KB) | |
6414 | TYPE: b_size_t | |
df2eec10 | 6415 | DEFAULT: 64 KB |
f04b37d8 | 6416 | LOC: Config.maxReplyHeaderSize |
6417 | DOC_START | |
6418 | This specifies the maximum size for HTTP headers in a reply. | |
6419 | Reply headers are usually relatively small (about 512 bytes). | |
6420 | Placing a limit on the reply header size will catch certain | |
6421 | bugs (for example with persistent connections) and possibly | |
6422 | buffer-overflow or denial-of-service attacks. | |
6423 | DOC_END | |
6424 | ||
6425 | NAME: request_body_max_size | |
6426 | COMMENT: (bytes) | |
6427 | TYPE: b_int64_t | |
6428 | DEFAULT: 0 KB | |
638402dd | 6429 | DEFAULT_DOC: No limit. |
f04b37d8 | 6430 | LOC: Config.maxRequestBodySize |
6431 | DOC_START | |
6432 | This specifies the maximum size for an HTTP request body. | |
6433 | In other words, the maximum size of a PUT/POST request. | |
6434 | A user who attempts to send a request with a body larger | |
6435 | than this limit receives an "Invalid Request" error message. | |
6436 | If you set this parameter to a zero (the default), there will | |
6437 | be no limit imposed. | |
638402dd AJ |
6438 | |
6439 | See also client_request_buffer_max_size for an alternative | |
6440 | limitation on client uploads which can be configured. | |
f04b37d8 | 6441 | DOC_END |
6442 | ||
1368d115 CT |
6443 | NAME: client_request_buffer_max_size |
6444 | COMMENT: (bytes) | |
6445 | TYPE: b_size_t | |
6446 | DEFAULT: 512 KB | |
6447 | LOC: Config.maxRequestBufferSize | |
6448 | DOC_START | |
6449 | This specifies the maximum buffer size of a client request. | |
6450 | It prevents squid eating too much memory when somebody uploads | |
6451 | a large file. | |
6452 | DOC_END | |
6453 | ||
41bd17a4 | 6454 | NAME: broken_posts |
626096be | 6455 | IFDEF: USE_HTTP_VIOLATIONS |
cccac0a2 | 6456 | TYPE: acl_access |
cccac0a2 | 6457 | DEFAULT: none |
638402dd | 6458 | DEFAULT_DOC: Obey RFC 2616. |
41bd17a4 | 6459 | LOC: Config.accessList.brokenPosts |
cccac0a2 | 6460 | DOC_START |
41bd17a4 | 6461 | A list of ACL elements which, if matched, causes Squid to send |
6462 | an extra CRLF pair after the body of a PUT/POST request. | |
cccac0a2 | 6463 | |
41bd17a4 | 6464 | Some HTTP servers has broken implementations of PUT/POST, |
6465 | and rely on an extra CRLF pair sent by some WWW clients. | |
cccac0a2 | 6466 | |
41bd17a4 | 6467 | Quote from RFC2616 section 4.1 on this matter: |
cccac0a2 | 6468 | |
41bd17a4 | 6469 | Note: certain buggy HTTP/1.0 client implementations generate an |
6470 | extra CRLF's after a POST request. To restate what is explicitly | |
6471 | forbidden by the BNF, an HTTP/1.1 client must not preface or follow | |
6472 | a request with an extra CRLF. | |
cccac0a2 | 6473 | |
b3567eb5 FC |
6474 | This clause only supports fast acl types. |
6475 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
6476 | ||
41bd17a4 | 6477 | Example: |
6478 | acl buggy_server url_regex ^http://.... | |
6479 | broken_posts allow buggy_server | |
6480 | DOC_END | |
cccac0a2 | 6481 | |
22fff3bf | 6482 | NAME: adaptation_uses_indirect_client icap_uses_indirect_client |
57d76dd4 AJ |
6483 | COMMENT: on|off |
6484 | TYPE: onoff | |
22fff3bf | 6485 | IFDEF: FOLLOW_X_FORWARDED_FOR&&USE_ADAPTATION |
57d76dd4 | 6486 | DEFAULT: on |
22fff3bf | 6487 | LOC: Adaptation::Config::use_indirect_client |
57d76dd4 | 6488 | DOC_START |
ea3ae478 AR |
6489 | Controls whether the indirect client IP address (instead of the direct |
6490 | client IP address) is passed to adaptation services. | |
6491 | ||
6492 | See also: follow_x_forwarded_for adaptation_send_client_ip | |
57d76dd4 AJ |
6493 | DOC_END |
6494 | ||
41bd17a4 | 6495 | NAME: via |
626096be | 6496 | IFDEF: USE_HTTP_VIOLATIONS |
41bd17a4 | 6497 | COMMENT: on|off |
6498 | TYPE: onoff | |
6499 | DEFAULT: on | |
6500 | LOC: Config.onoff.via | |
6501 | DOC_START | |
6502 | If set (default), Squid will include a Via header in requests and | |
6503 | replies as required by RFC2616. | |
6504 | DOC_END | |
4cc6eb12 | 6505 | |
41bd17a4 | 6506 | NAME: vary_ignore_expire |
6507 | COMMENT: on|off | |
6508 | TYPE: onoff | |
6509 | LOC: Config.onoff.vary_ignore_expire | |
6510 | DEFAULT: off | |
6511 | DOC_START | |
6512 | Many HTTP servers supporting Vary gives such objects | |
6513 | immediate expiry time with no cache-control header | |
6514 | when requested by a HTTP/1.0 client. This option | |
6515 | enables Squid to ignore such expiry times until | |
6516 | HTTP/1.1 is fully implemented. | |
7e73cd78 AJ |
6517 | |
6518 | WARNING: If turned on this may eventually cause some | |
6519 | varying objects not intended for caching to get cached. | |
cccac0a2 | 6520 | DOC_END |
c4ab8329 | 6521 | |
41bd17a4 | 6522 | NAME: request_entities |
6523 | TYPE: onoff | |
6524 | LOC: Config.onoff.request_entities | |
6525 | DEFAULT: off | |
6526 | DOC_START | |
6527 | Squid defaults to deny GET and HEAD requests with request entities, | |
6528 | as the meaning of such requests are undefined in the HTTP standard | |
6529 | even if not explicitly forbidden. | |
0976f8db | 6530 | |
41bd17a4 | 6531 | Set this directive to on if you have clients which insists |
6532 | on sending request entities in GET or HEAD requests. But be warned | |
6533 | that there is server software (both proxies and web servers) which | |
6534 | can fail to properly process this kind of request which may make you | |
6535 | vulnerable to cache pollution attacks if enabled. | |
cccac0a2 | 6536 | DOC_END |
6b53c392 | 6537 | |
41bd17a4 | 6538 | NAME: request_header_access |
626096be | 6539 | IFDEF: USE_HTTP_VIOLATIONS |
3b07476b | 6540 | TYPE: http_header_access |
41bd17a4 | 6541 | LOC: Config.request_header_access |
cccac0a2 | 6542 | DEFAULT: none |
638402dd | 6543 | DEFAULT_DOC: No limits. |
cccac0a2 | 6544 | DOC_START |
41bd17a4 | 6545 | Usage: request_header_access header_name allow|deny [!]aclname ... |
0976f8db | 6546 | |
41bd17a4 | 6547 | WARNING: Doing this VIOLATES the HTTP standard. Enabling |
6548 | this feature could make you liable for problems which it | |
6549 | causes. | |
0976f8db | 6550 | |
41bd17a4 | 6551 | This option replaces the old 'anonymize_headers' and the |
6552 | older 'http_anonymizer' option with something that is much | |
3b07476b CT |
6553 | more configurable. A list of ACLs for each header name allows |
6554 | removal of specific header fields under specific conditions. | |
6555 | ||
6556 | This option only applies to outgoing HTTP request headers (i.e., | |
6557 | headers sent by Squid to the next HTTP hop such as a cache peer | |
6558 | or an origin server). The option has no effect during cache hit | |
6559 | detection. The equivalent adaptation vectoring point in ICAP | |
6560 | terminology is post-cache REQMOD. | |
6561 | ||
6562 | The option is applied to individual outgoing request header | |
6563 | fields. For each request header field F, Squid uses the first | |
6564 | qualifying sets of request_header_access rules: | |
6565 | ||
6566 | 1. Rules with header_name equal to F's name. | |
6567 | 2. Rules with header_name 'Other', provided F's name is not | |
6568 | on the hard-coded list of commonly used HTTP header names. | |
6569 | 3. Rules with header_name 'All'. | |
6570 | ||
6571 | Within that qualifying rule set, rule ACLs are checked as usual. | |
6572 | If ACLs of an "allow" rule match, the header field is allowed to | |
6573 | go through as is. If ACLs of a "deny" rule match, the header is | |
6574 | removed and request_header_replace is then checked to identify | |
6575 | if the removed header has a replacement. If no rules within the | |
6576 | set have matching ACLs, the header field is left as is. | |
5401aa8d | 6577 | |
41bd17a4 | 6578 | For example, to achieve the same behavior as the old |
6579 | 'http_anonymizer standard' option, you should use: | |
5401aa8d | 6580 | |
41bd17a4 | 6581 | request_header_access From deny all |
6582 | request_header_access Referer deny all | |
41bd17a4 | 6583 | request_header_access User-Agent deny all |
5401aa8d | 6584 | |
41bd17a4 | 6585 | Or, to reproduce the old 'http_anonymizer paranoid' feature |
6586 | you should use: | |
5401aa8d | 6587 | |
41bd17a4 | 6588 | request_header_access Authorization allow all |
41bd17a4 | 6589 | request_header_access Proxy-Authorization allow all |
41bd17a4 | 6590 | request_header_access Cache-Control allow all |
41bd17a4 | 6591 | request_header_access Content-Length allow all |
6592 | request_header_access Content-Type allow all | |
6593 | request_header_access Date allow all | |
41bd17a4 | 6594 | request_header_access Host allow all |
6595 | request_header_access If-Modified-Since allow all | |
41bd17a4 | 6596 | request_header_access Pragma allow all |
6597 | request_header_access Accept allow all | |
6598 | request_header_access Accept-Charset allow all | |
6599 | request_header_access Accept-Encoding allow all | |
6600 | request_header_access Accept-Language allow all | |
41bd17a4 | 6601 | request_header_access Connection allow all |
41bd17a4 | 6602 | request_header_access All deny all |
5401aa8d | 6603 | |
638402dd | 6604 | HTTP reply headers are controlled with the reply_header_access directive. |
5401aa8d | 6605 | |
638402dd | 6606 | By default, all headers are allowed (no anonymizing is performed). |
5401aa8d | 6607 | DOC_END |
6608 | ||
41bd17a4 | 6609 | NAME: reply_header_access |
626096be | 6610 | IFDEF: USE_HTTP_VIOLATIONS |
3b07476b | 6611 | TYPE: http_header_access |
41bd17a4 | 6612 | LOC: Config.reply_header_access |
cccac0a2 | 6613 | DEFAULT: none |
638402dd | 6614 | DEFAULT_DOC: No limits. |
cccac0a2 | 6615 | DOC_START |
41bd17a4 | 6616 | Usage: reply_header_access header_name allow|deny [!]aclname ... |
934b03fc | 6617 | |
41bd17a4 | 6618 | WARNING: Doing this VIOLATES the HTTP standard. Enabling |
6619 | this feature could make you liable for problems which it | |
6620 | causes. | |
934b03fc | 6621 | |
41bd17a4 | 6622 | This option only applies to reply headers, i.e., from the |
6623 | server to the client. | |
934b03fc | 6624 | |
41bd17a4 | 6625 | This is the same as request_header_access, but in the other |
3b07476b CT |
6626 | direction. Please see request_header_access for detailed |
6627 | documentation. | |
cccac0a2 | 6628 | |
41bd17a4 | 6629 | For example, to achieve the same behavior as the old |
6630 | 'http_anonymizer standard' option, you should use: | |
cccac0a2 | 6631 | |
41bd17a4 | 6632 | reply_header_access Server deny all |
41bd17a4 | 6633 | reply_header_access WWW-Authenticate deny all |
6634 | reply_header_access Link deny all | |
cccac0a2 | 6635 | |
41bd17a4 | 6636 | Or, to reproduce the old 'http_anonymizer paranoid' feature |
6637 | you should use: | |
cccac0a2 | 6638 | |
41bd17a4 | 6639 | reply_header_access Allow allow all |
41bd17a4 | 6640 | reply_header_access WWW-Authenticate allow all |
41bd17a4 | 6641 | reply_header_access Proxy-Authenticate allow all |
6642 | reply_header_access Cache-Control allow all | |
6643 | reply_header_access Content-Encoding allow all | |
6644 | reply_header_access Content-Length allow all | |
6645 | reply_header_access Content-Type allow all | |
6646 | reply_header_access Date allow all | |
6647 | reply_header_access Expires allow all | |
41bd17a4 | 6648 | reply_header_access Last-Modified allow all |
6649 | reply_header_access Location allow all | |
6650 | reply_header_access Pragma allow all | |
41bd17a4 | 6651 | reply_header_access Content-Language allow all |
41bd17a4 | 6652 | reply_header_access Retry-After allow all |
6653 | reply_header_access Title allow all | |
638402dd | 6654 | reply_header_access Content-Disposition allow all |
41bd17a4 | 6655 | reply_header_access Connection allow all |
41bd17a4 | 6656 | reply_header_access All deny all |
cccac0a2 | 6657 | |
638402dd | 6658 | HTTP request headers are controlled with the request_header_access directive. |
cccac0a2 | 6659 | |
41bd17a4 | 6660 | By default, all headers are allowed (no anonymizing is |
6661 | performed). | |
cccac0a2 | 6662 | DOC_END |
6663 | ||
75e4f2ea | 6664 | NAME: request_header_replace header_replace |
626096be | 6665 | IFDEF: USE_HTTP_VIOLATIONS |
3b07476b | 6666 | TYPE: http_header_replace |
41bd17a4 | 6667 | LOC: Config.request_header_access |
cccac0a2 | 6668 | DEFAULT: none |
41bd17a4 | 6669 | DOC_START |
75e4f2ea MB |
6670 | Usage: request_header_replace header_name message |
6671 | Example: request_header_replace User-Agent Nutscrape/1.0 (CP/M; 8-bit) | |
cccac0a2 | 6672 | |
41bd17a4 | 6673 | This option allows you to change the contents of headers |
75e4f2ea | 6674 | denied with request_header_access above, by replacing them |
638402dd | 6675 | with some fixed string. |
cccac0a2 | 6676 | |
41bd17a4 | 6677 | This only applies to request headers, not reply headers. |
cccac0a2 | 6678 | |
41bd17a4 | 6679 | By default, headers are removed if denied. |
6680 | DOC_END | |
cccac0a2 | 6681 | |
75e4f2ea MB |
6682 | NAME: reply_header_replace |
6683 | IFDEF: USE_HTTP_VIOLATIONS | |
3b07476b | 6684 | TYPE: http_header_replace |
75e4f2ea MB |
6685 | LOC: Config.reply_header_access |
6686 | DEFAULT: none | |
6687 | DOC_START | |
6688 | Usage: reply_header_replace header_name message | |
6689 | Example: reply_header_replace Server Foo/1.0 | |
6690 | ||
6691 | This option allows you to change the contents of headers | |
6692 | denied with reply_header_access above, by replacing them | |
6693 | with some fixed string. | |
6694 | ||
6695 | This only applies to reply headers, not request headers. | |
6696 | ||
6697 | By default, headers are removed if denied. | |
6698 | DOC_END | |
6699 | ||
f4698e0b CT |
6700 | NAME: request_header_add |
6701 | TYPE: HeaderWithAclList | |
6702 | LOC: Config.request_header_add | |
6703 | DEFAULT: none | |
6704 | DOC_START | |
cde8f31b | 6705 | Usage: request_header_add field-name field-value [ acl ... ] |
f4698e0b CT |
6706 | Example: request_header_add X-Client-CA "CA=%ssl::>cert_issuer" all |
6707 | ||
6708 | This option adds header fields to outgoing HTTP requests (i.e., | |
6709 | request headers sent by Squid to the next HTTP hop such as a | |
6710 | cache peer or an origin server). The option has no effect during | |
6711 | cache hit detection. The equivalent adaptation vectoring point | |
6712 | in ICAP terminology is post-cache REQMOD. | |
6713 | ||
6714 | Field-name is a token specifying an HTTP header name. If a | |
6715 | standard HTTP header name is used, Squid does not check whether | |
6716 | the new header conflicts with any existing headers or violates | |
6717 | HTTP rules. If the request to be modified already contains a | |
6718 | field with the same name, the old field is preserved but the | |
6719 | header field values are not merged. | |
6720 | ||
6721 | Field-value is either a token or a quoted string. If quoted | |
6722 | string format is used, then the surrounding quotes are removed | |
6723 | while escape sequences and %macros are processed. | |
6724 | ||
f4698e0b CT |
6725 | One or more Squid ACLs may be specified to restrict header |
6726 | injection to matching requests. As always in squid.conf, all | |
cde8f31b NH |
6727 | ACLs in the ACL list must be satisfied for the insertion to |
6728 | happen. The request_header_add supports fast ACLs only. | |
6729 | ||
6730 | See also: reply_header_add. | |
6731 | DOC_END | |
6732 | ||
6733 | NAME: reply_header_add | |
6734 | TYPE: HeaderWithAclList | |
6735 | LOC: Config.reply_header_add | |
6736 | DEFAULT: none | |
6737 | DOC_START | |
6738 | Usage: reply_header_add field-name field-value [ acl ... ] | |
6739 | Example: reply_header_add X-Client-CA "CA=%ssl::>cert_issuer" all | |
6740 | ||
6741 | This option adds header fields to outgoing HTTP responses (i.e., response | |
6742 | headers delivered by Squid to the client). This option has no effect on | |
6743 | cache hit detection. The equivalent adaptation vectoring point in | |
6744 | ICAP terminology is post-cache RESPMOD. This option does not apply to | |
6745 | successful CONNECT replies. | |
6746 | ||
6747 | Field-name is a token specifying an HTTP header name. If a | |
6748 | standard HTTP header name is used, Squid does not check whether | |
6749 | the new header conflicts with any existing headers or violates | |
6750 | HTTP rules. If the response to be modified already contains a | |
6751 | field with the same name, the old field is preserved but the | |
6752 | header field values are not merged. | |
6753 | ||
6754 | Field-value is either a token or a quoted string. If quoted | |
6755 | string format is used, then the surrounding quotes are removed | |
6756 | while escape sequences and %macros are processed. | |
6757 | ||
6758 | One or more Squid ACLs may be specified to restrict header | |
6759 | injection to matching responses. As always in squid.conf, all | |
6760 | ACLs in the ACL list must be satisfied for the insertion to | |
6761 | happen. The reply_header_add option supports fast ACLs only. | |
6762 | ||
6763 | See also: request_header_add. | |
f4698e0b CT |
6764 | DOC_END |
6765 | ||
d7f4a0b7 CT |
6766 | NAME: note |
6767 | TYPE: note | |
6768 | LOC: Config.notes | |
6769 | DEFAULT: none | |
6770 | DOC_START | |
6771 | This option used to log custom information about the master | |
6772 | transaction. For example, an admin may configure Squid to log | |
6773 | which "user group" the transaction belongs to, where "user group" | |
6774 | will be determined based on a set of ACLs and not [just] | |
6775 | authentication information. | |
6776 | Values of key/value pairs can be logged using %{key}note macros: | |
6777 | ||
6778 | note key value acl ... | |
6779 | logformat myFormat ... %{key}note ... | |
6780 | DOC_END | |
6781 | ||
41bd17a4 | 6782 | NAME: relaxed_header_parser |
6783 | COMMENT: on|off|warn | |
6784 | TYPE: tristate | |
6785 | LOC: Config.onoff.relaxed_header_parser | |
6786 | DEFAULT: on | |
6787 | DOC_START | |
6788 | In the default "on" setting Squid accepts certain forms | |
6789 | of non-compliant HTTP messages where it is unambiguous | |
6790 | what the sending application intended even if the message | |
6791 | is not correctly formatted. The messages is then normalized | |
6792 | to the correct form when forwarded by Squid. | |
cccac0a2 | 6793 | |
41bd17a4 | 6794 | If set to "warn" then a warning will be emitted in cache.log |
6795 | each time such HTTP error is encountered. | |
cccac0a2 | 6796 | |
41bd17a4 | 6797 | If set to "off" then such HTTP errors will cause the request |
6798 | or response to be rejected. | |
6799 | DOC_END | |
7d90757b | 6800 | |
55eae904 AR |
6801 | NAME: collapsed_forwarding |
6802 | COMMENT: (on|off) | |
6803 | TYPE: onoff | |
6804 | LOC: Config.onoff.collapsed_forwarding | |
6805 | DEFAULT: off | |
6806 | DOC_START | |
6807 | This option controls whether Squid is allowed to merge multiple | |
6808 | potentially cachable requests for the same URI before Squid knows | |
6809 | whether the response is going to be cachable. | |
6810 | ||
1a210de4 EB |
6811 | When enabled, instead of forwarding each concurrent request for |
6812 | the same URL, Squid just sends the first of them. The other, so | |
6813 | called "collapsed" requests, wait for the response to the first | |
6814 | request and, if it happens to be cachable, use that response. | |
6815 | Here, "concurrent requests" means "received after the first | |
6816 | request headers were parsed and before the corresponding response | |
6817 | headers were parsed". | |
6818 | ||
6819 | This feature is disabled by default: enabling collapsed | |
6820 | forwarding needlessly delays forwarding requests that look | |
6821 | cachable (when they are collapsed) but then need to be forwarded | |
6822 | individually anyway because they end up being for uncachable | |
6823 | content. However, in some cases, such as acceleration of highly | |
6824 | cachable content with periodic or grouped expiration times, the | |
6825 | gains from collapsing [large volumes of simultaneous refresh | |
6826 | requests] outweigh losses from such delays. | |
6827 | ||
6828 | Squid collapses two kinds of requests: regular client requests | |
6829 | received on one of the listening ports and internal "cache | |
6830 | revalidation" requests which are triggered by those regular | |
6831 | requests hitting a stale cached object. Revalidation collapsing | |
6832 | is currently disabled for Squid instances containing SMP-aware | |
6833 | disk or memory caches and for Vary-controlled cached objects. | |
55eae904 AR |
6834 | DOC_END |
6835 | ||
819be284 EB |
6836 | NAME: collapsed_forwarding_access |
6837 | TYPE: acl_access | |
6838 | DEFAULT: none | |
6839 | DEFAULT_DOC: Requests may be collapsed if collapsed_forwarding is on. | |
6840 | LOC: Config.accessList.collapsedForwardingAccess | |
6841 | DOC_START | |
6842 | Use this directive to restrict collapsed forwarding to a subset of | |
6843 | eligible requests. The directive is checked for regular HTTP | |
6844 | requests, internal revalidation requests, and HTCP/ICP requests. | |
6845 | ||
6846 | collapsed_forwarding_access allow|deny [!]aclname ... | |
6847 | ||
6848 | This directive cannot force collapsing. It has no effect on | |
6849 | collapsing unless collapsed_forwarding is 'on', and all other | |
6850 | collapsing preconditions are satisfied. | |
6851 | ||
6852 | * A denied request will not collapse, and future transactions will | |
6853 | not collapse on it (even if they are allowed to collapse). | |
6854 | ||
6855 | * An allowed request may collapse, or future transactions may | |
6856 | collapse on it (provided they are allowed to collapse). | |
6857 | ||
6858 | This directive is evaluated before receiving HTTP response headers | |
6859 | and without access to Squid-to-peer connection (if any). | |
6860 | ||
6861 | Only fast ACLs are supported. | |
6862 | ||
6863 | See also: collapsed_forwarding. | |
6864 | DOC_END | |
6865 | ||
daed75a9 | 6866 | NAME: shared_transient_entries_limit collapsed_forwarding_shared_entries_limit |
8f7dbf74 DD |
6867 | COMMENT: (number of entries) |
6868 | TYPE: int64_t | |
daed75a9 | 6869 | LOC: Config.shared_transient_entries_limit |
8f7dbf74 DD |
6870 | DEFAULT: 16384 |
6871 | DOC_START | |
daed75a9 EB |
6872 | This directive limits the size of a table used for sharing current |
6873 | transaction information among SMP workers. A table entry stores meta | |
6874 | information about a single cache entry being delivered to Squid | |
6875 | client(s) by one or more SMP workers. A single table entry consumes | |
6876 | less than 128 shared memory bytes. | |
8f7dbf74 | 6877 | |
daed75a9 EB |
6878 | The limit should be significantly larger than the number of |
6879 | concurrent non-collapsed cachable responses leaving Squid. For a | |
6880 | cache that handles less than 5000 concurrent requests, the default | |
8f7dbf74 DD |
6881 | setting of 16384 should be plenty. |
6882 | ||
daed75a9 EB |
6883 | Using excessively large values wastes shared memory. Limiting the |
6884 | table size too much results in hash collisions, leading to lower hit | |
6885 | ratio and missed SMP request collapsing opportunities: Transactions | |
6886 | left without a table entry cannot cache their responses and are | |
6887 | invisible to other concurrent requests for the same resource. | |
6888 | ||
6889 | A zero limit is allowed but unsupported. A positive small limit | |
6890 | lowers hit ratio, but zero limit disables a lot of essential | |
6891 | synchronization among SMP workers, leading to HTTP violations (e.g., | |
6892 | stale hit responses). It also disables shared collapsed forwarding: | |
6893 | A worker becomes unable to collapse its requests on transactions in | |
6894 | other workers, resulting in more trips to the origin server and more | |
6895 | cache thrashing. | |
8f7dbf74 DD |
6896 | DOC_END |
6897 | ||
41bd17a4 | 6898 | COMMENT_START |
6899 | TIMEOUTS | |
6900 | ----------------------------------------------------------------------------- | |
6901 | COMMENT_END | |
6902 | ||
6903 | NAME: forward_timeout | |
6904 | COMMENT: time-units | |
6905 | TYPE: time_t | |
6906 | LOC: Config.Timeout.forward | |
6907 | DEFAULT: 4 minutes | |
6908 | DOC_START | |
6909 | This parameter specifies how long Squid should at most attempt in | |
6910 | finding a forwarding path for the request before giving up. | |
cccac0a2 | 6911 | DOC_END |
6912 | ||
41bd17a4 | 6913 | NAME: connect_timeout |
6914 | COMMENT: time-units | |
6915 | TYPE: time_t | |
6916 | LOC: Config.Timeout.connect | |
6917 | DEFAULT: 1 minute | |
057f5854 | 6918 | DOC_START |
41bd17a4 | 6919 | This parameter specifies how long to wait for the TCP connect to |
6920 | the requested server or peer to complete before Squid should | |
6921 | attempt to find another path where to forward the request. | |
057f5854 | 6922 | DOC_END |
6923 | ||
41bd17a4 | 6924 | NAME: peer_connect_timeout |
6925 | COMMENT: time-units | |
6926 | TYPE: time_t | |
6927 | LOC: Config.Timeout.peer_connect | |
6928 | DEFAULT: 30 seconds | |
cccac0a2 | 6929 | DOC_START |
41bd17a4 | 6930 | This parameter specifies how long to wait for a pending TCP |
6931 | connection to a peer cache. The default is 30 seconds. You | |
6932 | may also set different timeout values for individual neighbors | |
6933 | with the 'connect-timeout' option on a 'cache_peer' line. | |
6934 | DOC_END | |
7f7db318 | 6935 | |
41bd17a4 | 6936 | NAME: read_timeout |
6937 | COMMENT: time-units | |
6938 | TYPE: time_t | |
6939 | LOC: Config.Timeout.read | |
6940 | DEFAULT: 15 minutes | |
6941 | DOC_START | |
d5430dc8 AJ |
6942 | Applied on peer server connections. |
6943 | ||
6944 | After each successful read(), the timeout will be extended by this | |
41bd17a4 | 6945 | amount. If no data is read again after this amount of time, |
d5430dc8 AJ |
6946 | the request is aborted and logged with ERR_READ_TIMEOUT. |
6947 | ||
6948 | The default is 15 minutes. | |
41bd17a4 | 6949 | DOC_END |
cccac0a2 | 6950 | |
5ef5e5cc AJ |
6951 | NAME: write_timeout |
6952 | COMMENT: time-units | |
6953 | TYPE: time_t | |
6954 | LOC: Config.Timeout.write | |
6955 | DEFAULT: 15 minutes | |
6956 | DOC_START | |
6957 | This timeout is tracked for all connections that have data | |
6958 | available for writing and are waiting for the socket to become | |
6959 | ready. After each successful write, the timeout is extended by | |
6960 | the configured amount. If Squid has data to write but the | |
6961 | connection is not ready for the configured duration, the | |
6962 | transaction associated with the connection is terminated. The | |
6963 | default is 15 minutes. | |
6964 | DOC_END | |
6965 | ||
41bd17a4 | 6966 | NAME: request_timeout |
6967 | TYPE: time_t | |
6968 | LOC: Config.Timeout.request | |
6969 | DEFAULT: 5 minutes | |
6970 | DOC_START | |
6b2a2108 | 6971 | How long to wait for complete HTTP request headers after initial |
41bd17a4 | 6972 | connection establishment. |
6973 | DOC_END | |
cccac0a2 | 6974 | |
3248e962 CT |
6975 | NAME: request_start_timeout |
6976 | TYPE: time_t | |
6977 | LOC: Config.Timeout.request_start_timeout | |
6978 | DEFAULT: 5 minutes | |
6979 | DOC_START | |
6980 | How long to wait for the first request byte after initial | |
6981 | connection establishment. | |
6982 | DOC_END | |
6983 | ||
97b32442 | 6984 | NAME: client_idle_pconn_timeout persistent_request_timeout |
41bd17a4 | 6985 | TYPE: time_t |
97b32442 | 6986 | LOC: Config.Timeout.clientIdlePconn |
41bd17a4 | 6987 | DEFAULT: 2 minutes |
6988 | DOC_START | |
6989 | How long to wait for the next HTTP request on a persistent | |
97b32442 | 6990 | client connection after the previous request completes. |
41bd17a4 | 6991 | DOC_END |
cccac0a2 | 6992 | |
f6e8754a AR |
6993 | NAME: ftp_client_idle_timeout |
6994 | TYPE: time_t | |
6995 | LOC: Config.Timeout.ftpClientIdle | |
6996 | DEFAULT: 30 minutes | |
6997 | DOC_START | |
6998 | How long to wait for an FTP request on a connection to Squid ftp_port. | |
6999 | Many FTP clients do not deal with idle connection closures well, | |
7000 | necessitating a longer default timeout than client_idle_pconn_timeout | |
7001 | used for incoming HTTP requests. | |
7002 | DOC_END | |
7003 | ||
41bd17a4 | 7004 | NAME: client_lifetime |
7005 | COMMENT: time-units | |
7006 | TYPE: time_t | |
7007 | LOC: Config.Timeout.lifetime | |
7008 | DEFAULT: 1 day | |
7009 | DOC_START | |
7010 | The maximum amount of time a client (browser) is allowed to | |
7011 | remain connected to the cache process. This protects the Cache | |
7012 | from having a lot of sockets (and hence file descriptors) tied up | |
7013 | in a CLOSE_WAIT state from remote clients that go away without | |
7014 | properly shutting down (either because of a network failure or | |
7015 | because of a poor client implementation). The default is one | |
7016 | day, 1440 minutes. | |
7d90757b | 7017 | |
41bd17a4 | 7018 | NOTE: The default value is intended to be much larger than any |
7019 | client would ever need to be connected to your cache. You | |
7020 | should probably change client_lifetime only as a last resort. | |
7021 | If you seem to have many client connections tying up | |
7022 | filedescriptors, we recommend first tuning the read_timeout, | |
7023 | request_timeout, persistent_request_timeout and quick_abort values. | |
cccac0a2 | 7024 | DOC_END |
7025 | ||
c5c06f02 CT |
7026 | NAME: pconn_lifetime |
7027 | COMMENT: time-units | |
7028 | TYPE: time_t | |
7029 | LOC: Config.Timeout.pconnLifetime | |
7030 | DEFAULT: 0 seconds | |
7031 | DOC_START | |
7032 | Desired maximum lifetime of a persistent connection. | |
7033 | When set, Squid will close a now-idle persistent connection that | |
7034 | exceeded configured lifetime instead of moving the connection into | |
7035 | the idle connection pool (or equivalent). No effect on ongoing/active | |
7036 | transactions. Connection lifetime is the time period from the | |
7037 | connection acceptance or opening time until "now". | |
7038 | ||
7039 | This limit is useful in environments with long-lived connections | |
7040 | where Squid configuration or environmental factors change during a | |
7041 | single connection lifetime. If unrestricted, some connections may | |
7042 | last for hours and even days, ignoring those changes that should | |
7043 | have affected their behavior or their existence. | |
7044 | ||
7045 | Currently, a new lifetime value supplied via Squid reconfiguration | |
7046 | has no effect on already idle connections unless they become busy. | |
7047 | ||
7048 | When set to '0' this limit is not used. | |
7049 | DOC_END | |
7050 | ||
41bd17a4 | 7051 | NAME: half_closed_clients |
7052 | TYPE: onoff | |
7053 | LOC: Config.onoff.half_closed_clients | |
0c2f5c4f | 7054 | DEFAULT: off |
4eb368f9 | 7055 | DOC_START |
41bd17a4 | 7056 | Some clients may shutdown the sending side of their TCP |
7057 | connections, while leaving their receiving sides open. Sometimes, | |
7058 | Squid can not tell the difference between a half-closed and a | |
0c2f5c4f AJ |
7059 | fully-closed TCP connection. |
7060 | ||
7061 | By default, Squid will immediately close client connections when | |
7062 | read(2) returns "no more data to read." | |
7063 | ||
abdf1651 | 7064 | Change this option to 'on' and Squid will keep open connections |
0c2f5c4f AJ |
7065 | until a read(2) or write(2) on the socket returns an error. |
7066 | This may show some benefits for reverse proxies. But if not | |
7067 | it is recommended to leave OFF. | |
4eb368f9 | 7068 | DOC_END |
7069 | ||
97b32442 | 7070 | NAME: server_idle_pconn_timeout pconn_timeout |
41bd17a4 | 7071 | TYPE: time_t |
97b32442 | 7072 | LOC: Config.Timeout.serverIdlePconn |
41bd17a4 | 7073 | DEFAULT: 1 minute |
cccac0a2 | 7074 | DOC_START |
41bd17a4 | 7075 | Timeout for idle persistent connections to servers and other |
7076 | proxies. | |
7077 | DOC_END | |
cccac0a2 | 7078 | |
41bd17a4 | 7079 | NAME: ident_timeout |
7080 | TYPE: time_t | |
7081 | IFDEF: USE_IDENT | |
4daaf3cb | 7082 | LOC: Ident::TheConfig.timeout |
41bd17a4 | 7083 | DEFAULT: 10 seconds |
7084 | DOC_START | |
7085 | Maximum time to wait for IDENT lookups to complete. | |
cccac0a2 | 7086 | |
41bd17a4 | 7087 | If this is too high, and you enabled IDENT lookups from untrusted |
7088 | users, you might be susceptible to denial-of-service by having | |
7089 | many ident requests going at once. | |
cccac0a2 | 7090 | DOC_END |
7091 | ||
41bd17a4 | 7092 | NAME: shutdown_lifetime |
7093 | COMMENT: time-units | |
7094 | TYPE: time_t | |
7095 | LOC: Config.shutdownLifetime | |
7096 | DEFAULT: 30 seconds | |
cccac0a2 | 7097 | DOC_START |
41bd17a4 | 7098 | When SIGTERM or SIGHUP is received, the cache is put into |
7099 | "shutdown pending" mode until all active sockets are closed. | |
7100 | This value is the lifetime to set for all open descriptors | |
7101 | during shutdown mode. Any active clients after this many | |
7102 | seconds will receive a 'timeout' message. | |
cccac0a2 | 7103 | DOC_END |
0976f8db | 7104 | |
cccac0a2 | 7105 | COMMENT_START |
7106 | ADMINISTRATIVE PARAMETERS | |
7107 | ----------------------------------------------------------------------------- | |
7108 | COMMENT_END | |
7109 | ||
7110 | NAME: cache_mgr | |
7111 | TYPE: string | |
7112 | DEFAULT: webmaster | |
7113 | LOC: Config.adminEmail | |
7114 | DOC_START | |
7115 | Email-address of local cache manager who will receive | |
638402dd | 7116 | mail if the cache dies. The default is "webmaster". |
cccac0a2 | 7117 | DOC_END |
7118 | ||
abacf776 | 7119 | NAME: mail_from |
7120 | TYPE: string | |
7121 | DEFAULT: none | |
7122 | LOC: Config.EmailFrom | |
7123 | DOC_START | |
7124 | From: email-address for mail sent when the cache dies. | |
638402dd AJ |
7125 | The default is to use 'squid@unique_hostname'. |
7126 | ||
7127 | See also: unique_hostname directive. | |
abacf776 | 7128 | DOC_END |
7129 | ||
d084bf20 | 7130 | NAME: mail_program |
7131 | TYPE: eol | |
7132 | DEFAULT: mail | |
7133 | LOC: Config.EmailProgram | |
7134 | DOC_START | |
7135 | Email program used to send mail if the cache dies. | |
846a5e31 | 7136 | The default is "mail". The specified program must comply |
d084bf20 | 7137 | with the standard Unix mail syntax: |
846a5e31 | 7138 | mail-program recipient < mailfile |
7139 | ||
d084bf20 | 7140 | Optional command line options can be specified. |
7141 | DOC_END | |
7142 | ||
cccac0a2 | 7143 | NAME: cache_effective_user |
7144 | TYPE: string | |
5483d916 | 7145 | DEFAULT: @DEFAULT_CACHE_EFFECTIVE_USER@ |
cccac0a2 | 7146 | LOC: Config.effectiveUser |
e3d74828 | 7147 | DOC_START |
7148 | If you start Squid as root, it will change its effective/real | |
7149 | UID/GID to the user specified below. The default is to change | |
5483d916 | 7150 | to UID of @DEFAULT_CACHE_EFFECTIVE_USER@. |
64e288bd | 7151 | see also; cache_effective_group |
e3d74828 | 7152 | DOC_END |
7153 | ||
cccac0a2 | 7154 | NAME: cache_effective_group |
7155 | TYPE: string | |
7156 | DEFAULT: none | |
638402dd | 7157 | DEFAULT_DOC: Use system group memberships of the cache_effective_user account |
cccac0a2 | 7158 | LOC: Config.effectiveGroup |
7159 | DOC_START | |
64e288bd | 7160 | Squid sets the GID to the effective user's default group ID |
7161 | (taken from the password file) and supplementary group list | |
7162 | from the groups membership. | |
7163 | ||
e3d74828 | 7164 | If you want Squid to run with a specific GID regardless of |
7165 | the group memberships of the effective user then set this | |
7166 | to the group (or GID) you want Squid to run as. When set | |
64e288bd | 7167 | all other group privileges of the effective user are ignored |
e3d74828 | 7168 | and only this GID is effective. If Squid is not started as |
64e288bd | 7169 | root the user starting Squid MUST be member of the specified |
e3d74828 | 7170 | group. |
64e288bd | 7171 | |
7172 | This option is not recommended by the Squid Team. | |
7173 | Our preference is for administrators to configure a secure | |
7174 | user account for squid with UID/GID matching system policies. | |
cccac0a2 | 7175 | DOC_END |
7176 | ||
d3caee79 | 7177 | NAME: httpd_suppress_version_string |
7178 | COMMENT: on|off | |
7179 | TYPE: onoff | |
7180 | DEFAULT: off | |
7181 | LOC: Config.onoff.httpd_suppress_version_string | |
7182 | DOC_START | |
7183 | Suppress Squid version string info in HTTP headers and HTML error pages. | |
7184 | DOC_END | |
7185 | ||
cccac0a2 | 7186 | NAME: visible_hostname |
7187 | TYPE: string | |
7188 | LOC: Config.visibleHostname | |
7189 | DEFAULT: none | |
638402dd | 7190 | DEFAULT_DOC: Automatically detect the system host name |
cccac0a2 | 7191 | DOC_START |
7192 | If you want to present a special hostname in error messages, etc, | |
7f7db318 | 7193 | define this. Otherwise, the return value of gethostname() |
cccac0a2 | 7194 | will be used. If you have multiple caches in a cluster and |
7195 | get errors about IP-forwarding you must set them to have individual | |
7196 | names with this setting. | |
7197 | DOC_END | |
7198 | ||
cccac0a2 | 7199 | NAME: unique_hostname |
7200 | TYPE: string | |
7201 | LOC: Config.uniqueHostname | |
7202 | DEFAULT: none | |
638402dd | 7203 | DEFAULT_DOC: Copy the value from visible_hostname |
cccac0a2 | 7204 | DOC_START |
7205 | If you want to have multiple machines with the same | |
7f7db318 | 7206 | 'visible_hostname' you must give each machine a different |
7207 | 'unique_hostname' so forwarding loops can be detected. | |
cccac0a2 | 7208 | DOC_END |
7209 | ||
cccac0a2 | 7210 | NAME: hostname_aliases |
7211 | TYPE: wordlist | |
7212 | LOC: Config.hostnameAliases | |
7213 | DEFAULT: none | |
7214 | DOC_START | |
7f7db318 | 7215 | A list of other DNS names your cache has. |
cccac0a2 | 7216 | DOC_END |
0976f8db | 7217 | |
c642c141 AJ |
7218 | NAME: umask |
7219 | TYPE: int | |
7220 | LOC: Config.umask | |
7221 | DEFAULT: 027 | |
7222 | DOC_START | |
7223 | Minimum umask which should be enforced while the proxy | |
7224 | is running, in addition to the umask set at startup. | |
7225 | ||
7226 | For a traditional octal representation of umasks, start | |
7227 | your value with 0. | |
7228 | DOC_END | |
7229 | ||
cccac0a2 | 7230 | COMMENT_START |
7231 | OPTIONS FOR THE CACHE REGISTRATION SERVICE | |
7232 | ----------------------------------------------------------------------------- | |
7233 | ||
7234 | This section contains parameters for the (optional) cache | |
7235 | announcement service. This service is provided to help | |
7236 | cache administrators locate one another in order to join or | |
7237 | create cache hierarchies. | |
7238 | ||
7239 | An 'announcement' message is sent (via UDP) to the registration | |
7240 | service by Squid. By default, the announcement message is NOT | |
7241 | SENT unless you enable it with 'announce_period' below. | |
7242 | ||
7243 | The announcement message includes your hostname, plus the | |
7244 | following information from this configuration file: | |
7245 | ||
7246 | http_port | |
7247 | icp_port | |
7248 | cache_mgr | |
7249 | ||
7250 | All current information is processed regularly and made | |
7251 | available on the Web at http://www.ircache.net/Cache/Tracker/. | |
7252 | COMMENT_END | |
7253 | ||
7254 | NAME: announce_period | |
7255 | TYPE: time_t | |
7256 | LOC: Config.Announce.period | |
7257 | DEFAULT: 0 | |
638402dd | 7258 | DEFAULT_DOC: Announcement messages disabled. |
cccac0a2 | 7259 | DOC_START |
638402dd | 7260 | This is how frequently to send cache announcements. |
cccac0a2 | 7261 | |
e0855596 | 7262 | To enable announcing your cache, just set an announce period. |
cccac0a2 | 7263 | |
e0855596 AJ |
7264 | Example: |
7265 | announce_period 1 day | |
cccac0a2 | 7266 | DOC_END |
7267 | ||
cccac0a2 | 7268 | NAME: announce_host |
7269 | TYPE: string | |
7270 | DEFAULT: tracker.ircache.net | |
7271 | LOC: Config.Announce.host | |
638402dd AJ |
7272 | DOC_START |
7273 | Set the hostname where announce registration messages will be sent. | |
7274 | ||
7275 | See also announce_port and announce_file | |
7276 | DOC_END | |
cccac0a2 | 7277 | |
7278 | NAME: announce_file | |
7279 | TYPE: string | |
7280 | DEFAULT: none | |
7281 | LOC: Config.Announce.file | |
638402dd AJ |
7282 | DOC_START |
7283 | The contents of this file will be included in the announce | |
7284 | registration messages. | |
7285 | DOC_END | |
cccac0a2 | 7286 | |
7287 | NAME: announce_port | |
ae870270 | 7288 | TYPE: u_short |
cccac0a2 | 7289 | DEFAULT: 3131 |
7290 | LOC: Config.Announce.port | |
7291 | DOC_START | |
638402dd | 7292 | Set the port where announce registration messages will be sent. |
cccac0a2 | 7293 | |
638402dd | 7294 | See also announce_host and announce_file |
cccac0a2 | 7295 | DOC_END |
7296 | ||
8d6275c0 | 7297 | COMMENT_START |
7298 | HTTPD-ACCELERATOR OPTIONS | |
7299 | ----------------------------------------------------------------------------- | |
7300 | COMMENT_END | |
7301 | ||
cccac0a2 | 7302 | NAME: httpd_accel_surrogate_id |
cccac0a2 | 7303 | TYPE: string |
b2b40d8c | 7304 | DEFAULT: none |
638402dd | 7305 | DEFAULT_DOC: visible_hostname is used if no specific ID is set. |
cccac0a2 | 7306 | LOC: Config.Accel.surrogate_id |
cccac0a2 | 7307 | DOC_START |
7308 | Surrogates (http://www.esi.org/architecture_spec_1.0.html) | |
7309 | need an identification token to allow control targeting. Because | |
7310 | a farm of surrogates may all perform the same tasks, they may share | |
7311 | an identification token. | |
609d5e06 AJ |
7312 | |
7313 | When the surrogate is a reverse-proxy, this ID is also | |
7314 | used as cdn-id for CDN-Loop detection (RFC 8586). | |
cccac0a2 | 7315 | DOC_END |
7316 | ||
7317 | NAME: http_accel_surrogate_remote | |
cccac0a2 | 7318 | COMMENT: on|off |
7319 | TYPE: onoff | |
7320 | DEFAULT: off | |
7321 | LOC: Config.onoff.surrogate_is_remote | |
7322 | DOC_START | |
638402dd AJ |
7323 | Remote surrogates (such as those in a CDN) honour the header |
7324 | "Surrogate-Control: no-store-remote". | |
7325 | ||
cccac0a2 | 7326 | Set this to on to have squid behave as a remote surrogate. |
7327 | DOC_END | |
7328 | ||
7329 | NAME: esi_parser | |
f41735ea | 7330 | IFDEF: USE_SQUID_ESI |
799b66d1 | 7331 | COMMENT: libxml2|expat |
cccac0a2 | 7332 | TYPE: string |
7333 | LOC: ESIParser::Type | |
799b66d1 AJ |
7334 | DEFAULT: auto |
7335 | DEFAULT_DOC: Selects libxml2 if available at ./configure time or libexpat otherwise. | |
cccac0a2 | 7336 | DOC_START |
799b66d1 AJ |
7337 | Selects the XML parsing library to use when interpreting responses with |
7338 | Edge Side Includes. | |
7339 | ||
7340 | To disable ESI handling completely, ./configure Squid with --disable-esi. | |
cccac0a2 | 7341 | DOC_END |
0976f8db | 7342 | |
9edd9041 | 7343 | COMMENT_START |
8d6275c0 | 7344 | DELAY POOL PARAMETERS |
9edd9041 | 7345 | ----------------------------------------------------------------------------- |
7346 | COMMENT_END | |
7347 | ||
7348 | NAME: delay_pools | |
7349 | TYPE: delay_pool_count | |
7350 | DEFAULT: 0 | |
9a0a18de | 7351 | IFDEF: USE_DELAY_POOLS |
9edd9041 | 7352 | LOC: Config.Delay |
7353 | DOC_START | |
7354 | This represents the number of delay pools to be used. For example, | |
7355 | if you have one class 2 delay pool and one class 3 delays pool, you | |
7356 | have a total of 2 delay pools. | |
638402dd AJ |
7357 | |
7358 | See also delay_parameters, delay_class, delay_access for pool | |
7359 | configuration details. | |
9edd9041 | 7360 | DOC_END |
7361 | ||
7362 | NAME: delay_class | |
7363 | TYPE: delay_pool_class | |
7364 | DEFAULT: none | |
9a0a18de | 7365 | IFDEF: USE_DELAY_POOLS |
9edd9041 | 7366 | LOC: Config.Delay |
7367 | DOC_START | |
7368 | This defines the class of each delay pool. There must be exactly one | |
7369 | delay_class line for each delay pool. For example, to define two | |
7370 | delay pools, one of class 2 and one of class 3, the settings above | |
7371 | and here would be: | |
7372 | ||
b1fb3348 AJ |
7373 | Example: |
7374 | delay_pools 4 # 4 delay pools | |
7375 | delay_class 1 2 # pool 1 is a class 2 pool | |
7376 | delay_class 2 3 # pool 2 is a class 3 pool | |
7377 | delay_class 3 4 # pool 3 is a class 4 pool | |
7378 | delay_class 4 5 # pool 4 is a class 5 pool | |
9edd9041 | 7379 | |
7380 | The delay pool classes are: | |
7381 | ||
7382 | class 1 Everything is limited by a single aggregate | |
7383 | bucket. | |
7384 | ||
7385 | class 2 Everything is limited by a single aggregate | |
7386 | bucket as well as an "individual" bucket chosen | |
b1fb3348 | 7387 | from bits 25 through 32 of the IPv4 address. |
9edd9041 | 7388 | |
7389 | class 3 Everything is limited by a single aggregate | |
7390 | bucket as well as a "network" bucket chosen | |
7391 | from bits 17 through 24 of the IP address and a | |
7392 | "individual" bucket chosen from bits 17 through | |
b1fb3348 | 7393 | 32 of the IPv4 address. |
9edd9041 | 7394 | |
7395 | class 4 Everything in a class 3 delay pool, with an | |
7396 | additional limit on a per user basis. This | |
7397 | only takes effect if the username is established | |
7398 | in advance - by forcing authentication in your | |
7399 | http_access rules. | |
7400 | ||
7401 | class 5 Requests are grouped according their tag (see | |
7402 | external_acl's tag= reply). | |
7403 | ||
0b68481a AJ |
7404 | |
7405 | Each pool also requires a delay_parameters directive to configure the pool size | |
7406 | and speed limits used whenever the pool is applied to a request. Along with | |
7407 | a set of delay_access directives to determine when it is used. | |
7408 | ||
9edd9041 | 7409 | NOTE: If an IP address is a.b.c.d |
7410 | -> bits 25 through 32 are "d" | |
7411 | -> bits 17 through 24 are "c" | |
7412 | -> bits 17 through 32 are "c * 256 + d" | |
b1fb3348 AJ |
7413 | |
7414 | NOTE-2: Due to the use of bitmasks in class 2,3,4 pools they only apply to | |
7415 | IPv4 traffic. Class 1 and 5 pools may be used with IPv6 traffic. | |
638402dd AJ |
7416 | |
7417 | This clause only supports fast acl types. | |
7418 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
7419 | ||
7420 | See also delay_parameters and delay_access. | |
9edd9041 | 7421 | DOC_END |
7422 | ||
7423 | NAME: delay_access | |
7424 | TYPE: delay_pool_access | |
7425 | DEFAULT: none | |
638402dd | 7426 | DEFAULT_DOC: Deny using the pool, unless allow rules exist in squid.conf for the pool. |
9a0a18de | 7427 | IFDEF: USE_DELAY_POOLS |
9edd9041 | 7428 | LOC: Config.Delay |
7429 | DOC_START | |
7430 | This is used to determine which delay pool a request falls into. | |
7431 | ||
7432 | delay_access is sorted per pool and the matching starts with pool 1, | |
7433 | then pool 2, ..., and finally pool N. The first delay pool where the | |
7434 | request is allowed is selected for the request. If it does not allow | |
7435 | the request to any pool then the request is not delayed (default). | |
7436 | ||
7437 | For example, if you want some_big_clients in delay | |
7438 | pool 1 and lotsa_little_clients in delay pool 2: | |
7439 | ||
638402dd AJ |
7440 | delay_access 1 allow some_big_clients |
7441 | delay_access 1 deny all | |
7442 | delay_access 2 allow lotsa_little_clients | |
7443 | delay_access 2 deny all | |
7444 | delay_access 3 allow authenticated_clients | |
7445 | ||
7446 | See also delay_parameters and delay_class. | |
7447 | ||
9edd9041 | 7448 | DOC_END |
7449 | ||
7450 | NAME: delay_parameters | |
7451 | TYPE: delay_pool_rates | |
7452 | DEFAULT: none | |
9a0a18de | 7453 | IFDEF: USE_DELAY_POOLS |
9edd9041 | 7454 | LOC: Config.Delay |
7455 | DOC_START | |
7456 | This defines the parameters for a delay pool. Each delay pool has | |
7457 | a number of "buckets" associated with it, as explained in the | |
0b68481a | 7458 | description of delay_class. |
9edd9041 | 7459 | |
0b68481a | 7460 | For a class 1 delay pool, the syntax is: |
6e7502cc | 7461 | delay_class pool 1 |
0b68481a | 7462 | delay_parameters pool aggregate |
9edd9041 | 7463 | |
7464 | For a class 2 delay pool: | |
6e7502cc | 7465 | delay_class pool 2 |
0b68481a | 7466 | delay_parameters pool aggregate individual |
9edd9041 | 7467 | |
7468 | For a class 3 delay pool: | |
6e7502cc | 7469 | delay_class pool 3 |
0b68481a | 7470 | delay_parameters pool aggregate network individual |
9edd9041 | 7471 | |
7472 | For a class 4 delay pool: | |
6e7502cc | 7473 | delay_class pool 4 |
0b68481a | 7474 | delay_parameters pool aggregate network individual user |
9edd9041 | 7475 | |
7476 | For a class 5 delay pool: | |
6e7502cc | 7477 | delay_class pool 5 |
0b68481a | 7478 | delay_parameters pool tagrate |
9edd9041 | 7479 | |
0b68481a | 7480 | The option variables are: |
9edd9041 | 7481 | |
7482 | pool a pool number - ie, a number between 1 and the | |
7483 | number specified in delay_pools as used in | |
7484 | delay_class lines. | |
7485 | ||
fdb47ac6 | 7486 | aggregate the speed limit parameters for the aggregate bucket |
9edd9041 | 7487 | (class 1, 2, 3). |
7488 | ||
fdb47ac6 | 7489 | individual the speed limit parameters for the individual |
9edd9041 | 7490 | buckets (class 2, 3). |
7491 | ||
fdb47ac6 | 7492 | network the speed limit parameters for the network buckets |
9edd9041 | 7493 | (class 3). |
7494 | ||
fdb47ac6 | 7495 | user the speed limit parameters for the user buckets |
9edd9041 | 7496 | (class 4). |
7497 | ||
fdb47ac6 | 7498 | tagrate the speed limit parameters for the tag buckets |
9edd9041 | 7499 | (class 5). |
7500 | ||
7501 | A pair of delay parameters is written restore/maximum, where restore is | |
7502 | the number of bytes (not bits - modem and network speeds are usually | |
7503 | quoted in bits) per second placed into the bucket, and maximum is the | |
7504 | maximum number of bytes which can be in the bucket at any time. | |
7505 | ||
0b68481a AJ |
7506 | There must be one delay_parameters line for each delay pool. |
7507 | ||
7508 | ||
9edd9041 | 7509 | For example, if delay pool number 1 is a class 2 delay pool as in the |
0b68481a | 7510 | above example, and is being used to strictly limit each host to 64Kbit/sec |
9edd9041 | 7511 | (plus overheads), with no overall limit, the line is: |
7512 | ||
6e7502cc | 7513 | delay_parameters 1 none 8000/8000 |
0b68481a | 7514 | |
c3e31a3a | 7515 | Note that 8 x 8K Byte/sec -> 64K bit/sec. |
9edd9041 | 7516 | |
6e7502cc | 7517 | Note that the word 'none' is used to represent no limit. |
9edd9041 | 7518 | |
0b68481a | 7519 | |
9edd9041 | 7520 | And, if delay pool number 2 is a class 3 delay pool as in the above |
0b68481a AJ |
7521 | example, and you want to limit it to a total of 256Kbit/sec (strict limit) |
7522 | with each 8-bit network permitted 64Kbit/sec (strict limit) and each | |
7523 | individual host permitted 4800bit/sec with a bucket maximum size of 64Kbits | |
9edd9041 | 7524 | to permit a decent web page to be downloaded at a decent speed |
7525 | (if the network is not being limited due to overuse) but slow down | |
7526 | large downloads more significantly: | |
7527 | ||
0b68481a AJ |
7528 | delay_parameters 2 32000/32000 8000/8000 600/8000 |
7529 | ||
c3e31a3a AJ |
7530 | Note that 8 x 32K Byte/sec -> 256K bit/sec. |
7531 | 8 x 8K Byte/sec -> 64K bit/sec. | |
7532 | 8 x 600 Byte/sec -> 4800 bit/sec. | |
9edd9041 | 7533 | |
9edd9041 | 7534 | |
7535 | Finally, for a class 4 delay pool as in the example - each user will | |
0b68481a | 7536 | be limited to 128Kbits/sec no matter how many workstations they are logged into.: |
9edd9041 | 7537 | |
0b68481a | 7538 | delay_parameters 4 32000/32000 8000/8000 600/64000 16000/16000 |
638402dd AJ |
7539 | |
7540 | ||
7541 | See also delay_class and delay_access. | |
7542 | ||
9edd9041 | 7543 | DOC_END |
7544 | ||
7545 | NAME: delay_initial_bucket_level | |
7546 | COMMENT: (percent, 0-100) | |
ae870270 | 7547 | TYPE: u_short |
9edd9041 | 7548 | DEFAULT: 50 |
9a0a18de | 7549 | IFDEF: USE_DELAY_POOLS |
9edd9041 | 7550 | LOC: Config.Delay.initial |
7551 | DOC_START | |
7552 | The initial bucket percentage is used to determine how much is put | |
7553 | in each bucket when squid starts, is reconfigured, or first notices | |
7554 | a host accessing it (in class 2 and class 3, individual hosts and | |
7555 | networks only have buckets associated with them once they have been | |
7556 | "seen" by squid). | |
7557 | DOC_END | |
7558 | ||
b4cd430a CT |
7559 | COMMENT_START |
7560 | CLIENT DELAY POOL PARAMETERS | |
7561 | ----------------------------------------------------------------------------- | |
7562 | COMMENT_END | |
7563 | ||
7564 | NAME: client_delay_pools | |
7565 | TYPE: client_delay_pool_count | |
7566 | DEFAULT: 0 | |
9a0a18de | 7567 | IFDEF: USE_DELAY_POOLS |
b4cd430a CT |
7568 | LOC: Config.ClientDelay |
7569 | DOC_START | |
7570 | This option specifies the number of client delay pools used. It must | |
7571 | preceed other client_delay_* options. | |
7572 | ||
638402dd AJ |
7573 | Example: |
7574 | client_delay_pools 2 | |
7575 | ||
7576 | See also client_delay_parameters and client_delay_access. | |
b4cd430a CT |
7577 | DOC_END |
7578 | ||
7579 | NAME: client_delay_initial_bucket_level | |
7580 | COMMENT: (percent, 0-no_limit) | |
ae870270 | 7581 | TYPE: u_short |
b4cd430a | 7582 | DEFAULT: 50 |
9a0a18de | 7583 | IFDEF: USE_DELAY_POOLS |
b4cd430a CT |
7584 | LOC: Config.ClientDelay.initial |
7585 | DOC_START | |
7586 | This option determines the initial bucket size as a percentage of | |
7587 | max_bucket_size from client_delay_parameters. Buckets are created | |
7588 | at the time of the "first" connection from the matching IP. Idle | |
7589 | buckets are periodically deleted up. | |
7590 | ||
7591 | You can specify more than 100 percent but note that such "oversized" | |
7592 | buckets are not refilled until their size goes down to max_bucket_size | |
7593 | from client_delay_parameters. | |
7594 | ||
638402dd AJ |
7595 | Example: |
7596 | client_delay_initial_bucket_level 50 | |
b4cd430a CT |
7597 | DOC_END |
7598 | ||
7599 | NAME: client_delay_parameters | |
7600 | TYPE: client_delay_pool_rates | |
7601 | DEFAULT: none | |
9a0a18de | 7602 | IFDEF: USE_DELAY_POOLS |
b4cd430a CT |
7603 | LOC: Config.ClientDelay |
7604 | DOC_START | |
7605 | ||
7606 | This option configures client-side bandwidth limits using the | |
7607 | following format: | |
7608 | ||
7609 | client_delay_parameters pool speed_limit max_bucket_size | |
7610 | ||
7611 | pool is an integer ID used for client_delay_access matching. | |
7612 | ||
7613 | speed_limit is bytes added to the bucket per second. | |
7614 | ||
7615 | max_bucket_size is the maximum size of a bucket, enforced after any | |
7616 | speed_limit additions. | |
7617 | ||
7618 | Please see the delay_parameters option for more information and | |
7619 | examples. | |
7620 | ||
638402dd AJ |
7621 | Example: |
7622 | client_delay_parameters 1 1024 2048 | |
7623 | client_delay_parameters 2 51200 16384 | |
7624 | ||
7625 | See also client_delay_access. | |
7626 | ||
b4cd430a CT |
7627 | DOC_END |
7628 | ||
7629 | NAME: client_delay_access | |
7630 | TYPE: client_delay_pool_access | |
7631 | DEFAULT: none | |
638402dd | 7632 | DEFAULT_DOC: Deny use of the pool, unless allow rules exist in squid.conf for the pool. |
9a0a18de | 7633 | IFDEF: USE_DELAY_POOLS |
b4cd430a CT |
7634 | LOC: Config.ClientDelay |
7635 | DOC_START | |
b4cd430a CT |
7636 | This option determines the client-side delay pool for the |
7637 | request: | |
7638 | ||
7639 | client_delay_access pool_ID allow|deny acl_name | |
7640 | ||
7641 | All client_delay_access options are checked in their pool ID | |
7642 | order, starting with pool 1. The first checked pool with allowed | |
7643 | request is selected for the request. If no ACL matches or there | |
7644 | are no client_delay_access options, the request bandwidth is not | |
7645 | limited. | |
7646 | ||
7647 | The ACL-selected pool is then used to find the | |
7648 | client_delay_parameters for the request. Client-side pools are | |
7649 | not used to aggregate clients. Clients are always aggregated | |
7650 | based on their source IP addresses (one bucket per source IP). | |
7651 | ||
638402dd AJ |
7652 | This clause only supports fast acl types. |
7653 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
7654 | Additionally, only the client TCP connection details are available. | |
7655 | ACLs testing HTTP properties will not work. | |
7656 | ||
b4cd430a CT |
7657 | Please see delay_access for more examples. |
7658 | ||
638402dd AJ |
7659 | Example: |
7660 | client_delay_access 1 allow low_rate_network | |
7661 | client_delay_access 2 allow vips_network | |
7662 | ||
7663 | ||
7664 | See also client_delay_parameters and client_delay_pools. | |
b4cd430a CT |
7665 | DOC_END |
7666 | ||
b27668ec EB |
7667 | NAME: response_delay_pool |
7668 | TYPE: response_delay_pool_parameters | |
7669 | DEFAULT: none | |
7670 | IFDEF: USE_DELAY_POOLS | |
7671 | LOC: Config.MessageDelay | |
7672 | DOC_START | |
7673 | This option configures client response bandwidth limits using the | |
7674 | following format: | |
7675 | ||
7676 | response_delay_pool name [option=value] ... | |
7677 | ||
7678 | name the response delay pool name | |
7679 | ||
7680 | available options: | |
7681 | ||
7682 | individual-restore The speed limit of an individual | |
7683 | bucket(bytes/s). To be used in conjunction | |
7684 | with 'individual-maximum'. | |
7685 | ||
7686 | individual-maximum The maximum number of bytes which can | |
7687 | be placed into the individual bucket. To be used | |
7688 | in conjunction with 'individual-restore'. | |
7689 | ||
7690 | aggregate-restore The speed limit for the aggregate | |
7691 | bucket(bytes/s). To be used in conjunction with | |
7692 | 'aggregate-maximum'. | |
7693 | ||
7694 | aggregate-maximum The maximum number of bytes which can | |
7695 | be placed into the aggregate bucket. To be used | |
7696 | in conjunction with 'aggregate-restore'. | |
7697 | ||
7698 | initial-bucket-level The initial bucket size as a percentage | |
7699 | of individual-maximum. | |
7700 | ||
7701 | Individual and(or) aggregate bucket options may not be specified, | |
7702 | meaning no individual and(or) aggregate speed limitation. | |
7703 | See also response_delay_pool_access and delay_parameters for | |
7704 | terminology details. | |
7705 | DOC_END | |
7706 | ||
7707 | NAME: response_delay_pool_access | |
7708 | TYPE: response_delay_pool_access | |
7709 | DEFAULT: none | |
7710 | DEFAULT_DOC: Deny use of the pool, unless allow rules exist in squid.conf for the pool. | |
7711 | IFDEF: USE_DELAY_POOLS | |
7712 | LOC: Config.MessageDelay | |
7713 | DOC_START | |
7714 | Determines whether a specific named response delay pool is used | |
7715 | for the transaction. The syntax for this directive is: | |
7716 | ||
7717 | response_delay_pool_access pool_name allow|deny acl_name | |
7718 | ||
7719 | All response_delay_pool_access options are checked in the order | |
7720 | they appear in this configuration file. The first rule with a | |
7721 | matching ACL wins. If (and only if) an "allow" rule won, Squid | |
7722 | assigns the response to the corresponding named delay pool. | |
7723 | DOC_END | |
7724 | ||
cccac0a2 | 7725 | COMMENT_START |
8d6275c0 | 7726 | WCCPv1 AND WCCPv2 CONFIGURATION OPTIONS |
cccac0a2 | 7727 | ----------------------------------------------------------------------------- |
7728 | COMMENT_END | |
7729 | ||
8d6275c0 | 7730 | NAME: wccp_router |
7731 | TYPE: address | |
7732 | LOC: Config.Wccp.router | |
0eb08770 | 7733 | DEFAULT: any_addr |
638402dd | 7734 | DEFAULT_DOC: WCCP disabled. |
8d6275c0 | 7735 | IFDEF: USE_WCCP |
e313ab0a AJ |
7736 | DOC_START |
7737 | Use this option to define your WCCP ``home'' router for | |
7738 | Squid. | |
7739 | ||
7740 | wccp_router supports a single WCCP(v1) router | |
7741 | ||
7742 | wccp2_router supports multiple WCCPv2 routers | |
7743 | ||
7744 | only one of the two may be used at the same time and defines | |
7745 | which version of WCCP to use. | |
7746 | DOC_END | |
df2eec10 | 7747 | |
8d6275c0 | 7748 | NAME: wccp2_router |
9fb4efad | 7749 | TYPE: IpAddress_list |
8d6275c0 | 7750 | LOC: Config.Wccp2.router |
cccac0a2 | 7751 | DEFAULT: none |
638402dd | 7752 | DEFAULT_DOC: WCCPv2 disabled. |
8d6275c0 | 7753 | IFDEF: USE_WCCPv2 |
cccac0a2 | 7754 | DOC_START |
8d6275c0 | 7755 | Use this option to define your WCCP ``home'' router for |
7756 | Squid. | |
cccac0a2 | 7757 | |
8d6275c0 | 7758 | wccp_router supports a single WCCP(v1) router |
cccac0a2 | 7759 | |
8d6275c0 | 7760 | wccp2_router supports multiple WCCPv2 routers |
cccac0a2 | 7761 | |
8d6275c0 | 7762 | only one of the two may be used at the same time and defines |
7763 | which version of WCCP to use. | |
7764 | DOC_END | |
7765 | ||
7766 | NAME: wccp_version | |
cccac0a2 | 7767 | TYPE: int |
8d6275c0 | 7768 | LOC: Config.Wccp.version |
7769 | DEFAULT: 4 | |
7770 | IFDEF: USE_WCCP | |
cccac0a2 | 7771 | DOC_START |
8d6275c0 | 7772 | This directive is only relevant if you need to set up WCCP(v1) |
7773 | to some very old and end-of-life Cisco routers. In all other | |
7774 | setups it must be left unset or at the default setting. | |
7775 | It defines an internal version in the WCCP(v1) protocol, | |
7776 | with version 4 being the officially documented protocol. | |
cccac0a2 | 7777 | |
8d6275c0 | 7778 | According to some users, Cisco IOS 11.2 and earlier only |
7779 | support WCCP version 3. If you're using that or an earlier | |
7780 | version of IOS, you may need to change this value to 3, otherwise | |
7781 | do not specify this parameter. | |
cccac0a2 | 7782 | DOC_END |
7783 | ||
8d6275c0 | 7784 | NAME: wccp2_rebuild_wait |
7785 | TYPE: onoff | |
7786 | LOC: Config.Wccp2.rebuildwait | |
7787 | DEFAULT: on | |
7788 | IFDEF: USE_WCCPv2 | |
7789 | DOC_START | |
7790 | If this is enabled Squid will wait for the cache dir rebuild to finish | |
7791 | before sending the first wccp2 HereIAm packet | |
7792 | DOC_END | |
cccac0a2 | 7793 | |
8d6275c0 | 7794 | NAME: wccp2_forwarding_method |
e313ab0a | 7795 | TYPE: wccp2_method |
8d6275c0 | 7796 | LOC: Config.Wccp2.forwarding_method |
451c4786 | 7797 | DEFAULT: gre |
8d6275c0 | 7798 | IFDEF: USE_WCCPv2 |
cccac0a2 | 7799 | DOC_START |
699acd19 | 7800 | WCCP2 allows the setting of forwarding methods between the |
8d6275c0 | 7801 | router/switch and the cache. Valid values are as follows: |
cccac0a2 | 7802 | |
451c4786 AJ |
7803 | gre - GRE encapsulation (forward the packet in a GRE/WCCP tunnel) |
7804 | l2 - L2 redirect (forward the packet using Layer 2/MAC rewriting) | |
cccac0a2 | 7805 | |
8d6275c0 | 7806 | Currently (as of IOS 12.4) cisco routers only support GRE. |
7807 | Cisco switches only support the L2 redirect assignment method. | |
cccac0a2 | 7808 | DOC_END |
7809 | ||
8d6275c0 | 7810 | NAME: wccp2_return_method |
e313ab0a | 7811 | TYPE: wccp2_method |
8d6275c0 | 7812 | LOC: Config.Wccp2.return_method |
451c4786 | 7813 | DEFAULT: gre |
8d6275c0 | 7814 | IFDEF: USE_WCCPv2 |
cccac0a2 | 7815 | DOC_START |
699acd19 | 7816 | WCCP2 allows the setting of return methods between the |
8d6275c0 | 7817 | router/switch and the cache for packets that the cache |
7818 | decides not to handle. Valid values are as follows: | |
cccac0a2 | 7819 | |
451c4786 AJ |
7820 | gre - GRE encapsulation (forward the packet in a GRE/WCCP tunnel) |
7821 | l2 - L2 redirect (forward the packet using Layer 2/MAC rewriting) | |
cccac0a2 | 7822 | |
8d6275c0 | 7823 | Currently (as of IOS 12.4) cisco routers only support GRE. |
7824 | Cisco switches only support the L2 redirect assignment. | |
cccac0a2 | 7825 | |
699acd19 | 7826 | If the "ip wccp redirect exclude in" command has been |
8d6275c0 | 7827 | enabled on the cache interface, then it is still safe for |
7828 | the proxy server to use a l2 redirect method even if this | |
7829 | option is set to GRE. | |
cccac0a2 | 7830 | DOC_END |
7831 | ||
8d6275c0 | 7832 | NAME: wccp2_assignment_method |
451c4786 | 7833 | TYPE: wccp2_amethod |
8d6275c0 | 7834 | LOC: Config.Wccp2.assignment_method |
451c4786 | 7835 | DEFAULT: hash |
8d6275c0 | 7836 | IFDEF: USE_WCCPv2 |
cccac0a2 | 7837 | DOC_START |
8d6275c0 | 7838 | WCCP2 allows the setting of methods to assign the WCCP hash |
7839 | Valid values are as follows: | |
cccac0a2 | 7840 | |
451c4786 | 7841 | hash - Hash assignment |
bb7a1781 | 7842 | mask - Mask assignment |
cccac0a2 | 7843 | |
8d6275c0 | 7844 | As a general rule, cisco routers support the hash assignment method |
7845 | and cisco switches support the mask assignment method. | |
7846 | DOC_END | |
cccac0a2 | 7847 | |
8d6275c0 | 7848 | NAME: wccp2_service |
7849 | TYPE: wccp2_service | |
7850 | LOC: Config.Wccp2.info | |
8d6275c0 | 7851 | DEFAULT_IF_NONE: standard 0 |
638402dd | 7852 | DEFAULT_DOC: Use the 'web-cache' standard service. |
8d6275c0 | 7853 | IFDEF: USE_WCCPv2 |
7854 | DOC_START | |
7855 | WCCP2 allows for multiple traffic services. There are two | |
7856 | types: "standard" and "dynamic". The standard type defines | |
7857 | one service id - http (id 0). The dynamic service ids can be from | |
7858 | 51 to 255 inclusive. In order to use a dynamic service id | |
7859 | one must define the type of traffic to be redirected; this is done | |
7860 | using the wccp2_service_info option. | |
7861 | ||
7862 | The "standard" type does not require a wccp2_service_info option, | |
7863 | just specifying the service id will suffice. | |
7864 | ||
7865 | MD5 service authentication can be enabled by adding | |
7866 | "password=<password>" to the end of this service declaration. | |
7867 | ||
7868 | Examples: | |
7869 | ||
7870 | wccp2_service standard 0 # for the 'web-cache' standard service | |
7871 | wccp2_service dynamic 80 # a dynamic service type which will be | |
7872 | # fleshed out with subsequent options. | |
7873 | wccp2_service standard 0 password=foo | |
8d6275c0 | 7874 | DOC_END |
7875 | ||
7876 | NAME: wccp2_service_info | |
7877 | TYPE: wccp2_service_info | |
7878 | LOC: Config.Wccp2.info | |
7879 | DEFAULT: none | |
7880 | IFDEF: USE_WCCPv2 | |
7881 | DOC_START | |
7882 | Dynamic WCCPv2 services require further information to define the | |
7883 | traffic you wish to have diverted. | |
7884 | ||
7885 | The format is: | |
7886 | ||
7887 | wccp2_service_info <id> protocol=<protocol> flags=<flag>,<flag>.. | |
7888 | priority=<priority> ports=<port>,<port>.. | |
7889 | ||
7890 | The relevant WCCPv2 flags: | |
7891 | + src_ip_hash, dst_ip_hash | |
005fe566 | 7892 | + source_port_hash, dst_port_hash |
8d6275c0 | 7893 | + src_ip_alt_hash, dst_ip_alt_hash |
7894 | + src_port_alt_hash, dst_port_alt_hash | |
7895 | + ports_source | |
7896 | ||
7897 | The port list can be one to eight entries. | |
7898 | ||
7899 | Example: | |
7900 | ||
7901 | wccp2_service_info 80 protocol=tcp flags=src_ip_hash,ports_source | |
7902 | priority=240 ports=80 | |
7903 | ||
7904 | Note: the service id must have been defined by a previous | |
7905 | 'wccp2_service dynamic <id>' entry. | |
7906 | DOC_END | |
7907 | ||
7908 | NAME: wccp2_weight | |
7909 | TYPE: int | |
7910 | LOC: Config.Wccp2.weight | |
7911 | DEFAULT: 10000 | |
7912 | IFDEF: USE_WCCPv2 | |
7913 | DOC_START | |
7914 | Each cache server gets assigned a set of the destination | |
7915 | hash proportional to their weight. | |
7916 | DOC_END | |
7917 | ||
7918 | NAME: wccp_address | |
7919 | TYPE: address | |
7920 | LOC: Config.Wccp.address | |
7921 | DEFAULT: 0.0.0.0 | |
638402dd | 7922 | DEFAULT_DOC: Address selected by the operating system. |
8d6275c0 | 7923 | IFDEF: USE_WCCP |
638402dd AJ |
7924 | DOC_START |
7925 | Use this option if you require WCCPv2 to use a specific | |
7926 | interface address. | |
7927 | ||
7928 | The default behavior is to not bind to any specific address. | |
7929 | DOC_END | |
df2eec10 | 7930 | |
8d6275c0 | 7931 | NAME: wccp2_address |
7932 | TYPE: address | |
7933 | LOC: Config.Wccp2.address | |
7934 | DEFAULT: 0.0.0.0 | |
638402dd | 7935 | DEFAULT_DOC: Address selected by the operating system. |
8d6275c0 | 7936 | IFDEF: USE_WCCPv2 |
7937 | DOC_START | |
7938 | Use this option if you require WCCP to use a specific | |
7939 | interface address. | |
7940 | ||
7941 | The default behavior is to not bind to any specific address. | |
7942 | DOC_END | |
7943 | ||
7944 | COMMENT_START | |
7945 | PERSISTENT CONNECTION HANDLING | |
7946 | ----------------------------------------------------------------------------- | |
7947 | ||
7948 | Also see "pconn_timeout" in the TIMEOUTS section | |
7949 | COMMENT_END | |
7950 | ||
7951 | NAME: client_persistent_connections | |
7952 | TYPE: onoff | |
7953 | LOC: Config.onoff.client_pconns | |
7954 | DEFAULT: on | |
638402dd AJ |
7955 | DOC_START |
7956 | Persistent connection support for clients. | |
7957 | Squid uses persistent connections (when allowed). You can use | |
7958 | this option to disable persistent connections with clients. | |
7959 | DOC_END | |
8d6275c0 | 7960 | |
7961 | NAME: server_persistent_connections | |
7962 | TYPE: onoff | |
7963 | LOC: Config.onoff.server_pconns | |
7964 | DEFAULT: on | |
7965 | DOC_START | |
638402dd AJ |
7966 | Persistent connection support for servers. |
7967 | Squid uses persistent connections (when allowed). You can use | |
7968 | this option to disable persistent connections with servers. | |
8d6275c0 | 7969 | DOC_END |
7970 | ||
7971 | NAME: persistent_connection_after_error | |
7972 | TYPE: onoff | |
7973 | LOC: Config.onoff.error_pconns | |
0fccfb7f | 7974 | DEFAULT: on |
8d6275c0 | 7975 | DOC_START |
7976 | With this directive the use of persistent connections after | |
7977 | HTTP errors can be disabled. Useful if you have clients | |
7978 | who fail to handle errors on persistent connections proper. | |
7979 | DOC_END | |
7980 | ||
7981 | NAME: detect_broken_pconn | |
7982 | TYPE: onoff | |
7983 | LOC: Config.onoff.detect_broken_server_pconns | |
7984 | DEFAULT: off | |
7985 | DOC_START | |
7986 | Some servers have been found to incorrectly signal the use | |
7987 | of HTTP/1.0 persistent connections even on replies not | |
7988 | compatible, causing significant delays. This server problem | |
7989 | has mostly been seen on redirects. | |
7990 | ||
7991 | By enabling this directive Squid attempts to detect such | |
7992 | broken replies and automatically assume the reply is finished | |
7993 | after 10 seconds timeout. | |
7994 | DOC_END | |
7995 | ||
7996 | COMMENT_START | |
7997 | CACHE DIGEST OPTIONS | |
7998 | ----------------------------------------------------------------------------- | |
7999 | COMMENT_END | |
8000 | ||
8001 | NAME: digest_generation | |
8002 | IFDEF: USE_CACHE_DIGESTS | |
8003 | TYPE: onoff | |
8004 | LOC: Config.onoff.digest_generation | |
8005 | DEFAULT: on | |
8006 | DOC_START | |
8007 | This controls whether the server will generate a Cache Digest | |
8008 | of its contents. By default, Cache Digest generation is | |
13e917b5 | 8009 | enabled if Squid is compiled with --enable-cache-digests defined. |
8d6275c0 | 8010 | DOC_END |
8011 | ||
8012 | NAME: digest_bits_per_entry | |
8013 | IFDEF: USE_CACHE_DIGESTS | |
8014 | TYPE: int | |
8015 | LOC: Config.digest.bits_per_entry | |
8016 | DEFAULT: 5 | |
8017 | DOC_START | |
8018 | This is the number of bits of the server's Cache Digest which | |
8019 | will be associated with the Digest entry for a given HTTP | |
8020 | Method and URL (public key) combination. The default is 5. | |
8021 | DOC_END | |
8022 | ||
8023 | NAME: digest_rebuild_period | |
8024 | IFDEF: USE_CACHE_DIGESTS | |
8025 | COMMENT: (seconds) | |
8026 | TYPE: time_t | |
8027 | LOC: Config.digest.rebuild_period | |
8028 | DEFAULT: 1 hour | |
8029 | DOC_START | |
749ceff8 | 8030 | This is the wait time between Cache Digest rebuilds. |
8d6275c0 | 8031 | DOC_END |
8032 | ||
8033 | NAME: digest_rewrite_period | |
8034 | COMMENT: (seconds) | |
8035 | IFDEF: USE_CACHE_DIGESTS | |
8036 | TYPE: time_t | |
8037 | LOC: Config.digest.rewrite_period | |
8038 | DEFAULT: 1 hour | |
8039 | DOC_START | |
749ceff8 | 8040 | This is the wait time between Cache Digest writes to |
8d6275c0 | 8041 | disk. |
8042 | DOC_END | |
8043 | ||
8044 | NAME: digest_swapout_chunk_size | |
8045 | COMMENT: (bytes) | |
8046 | TYPE: b_size_t | |
8047 | IFDEF: USE_CACHE_DIGESTS | |
8048 | LOC: Config.digest.swapout_chunk_size | |
8049 | DEFAULT: 4096 bytes | |
8050 | DOC_START | |
8051 | This is the number of bytes of the Cache Digest to write to | |
8052 | disk at a time. It defaults to 4096 bytes (4KB), the Squid | |
8053 | default swap page. | |
8054 | DOC_END | |
8055 | ||
8056 | NAME: digest_rebuild_chunk_percentage | |
8057 | COMMENT: (percent, 0-100) | |
8058 | IFDEF: USE_CACHE_DIGESTS | |
8059 | TYPE: int | |
8060 | LOC: Config.digest.rebuild_chunk_percentage | |
8061 | DEFAULT: 10 | |
8062 | DOC_START | |
8063 | This is the percentage of the Cache Digest to be scanned at a | |
8064 | time. By default it is set to 10% of the Cache Digest. | |
8065 | DOC_END | |
8066 | ||
1db9eacd | 8067 | COMMENT_START |
5473c134 | 8068 | SNMP OPTIONS |
1db9eacd | 8069 | ----------------------------------------------------------------------------- |
8070 | COMMENT_END | |
8071 | ||
5473c134 | 8072 | NAME: snmp_port |
ae870270 | 8073 | TYPE: u_short |
5473c134 | 8074 | LOC: Config.Port.snmp |
87630341 | 8075 | DEFAULT: 0 |
638402dd | 8076 | DEFAULT_DOC: SNMP disabled. |
5473c134 | 8077 | IFDEF: SQUID_SNMP |
8d6275c0 | 8078 | DOC_START |
87630341 | 8079 | The port number where Squid listens for SNMP requests. To enable |
8080 | SNMP support set this to a suitable port number. Port number | |
8081 | 3401 is often used for the Squid SNMP agent. By default it's | |
8082 | set to "0" (disabled) | |
e0855596 AJ |
8083 | |
8084 | Example: | |
8085 | snmp_port 3401 | |
8d6275c0 | 8086 | DOC_END |
8087 | ||
5473c134 | 8088 | NAME: snmp_access |
8089 | TYPE: acl_access | |
8090 | LOC: Config.accessList.snmp | |
638402dd AJ |
8091 | DEFAULT: none |
8092 | DEFAULT_DOC: Deny, unless rules exist in squid.conf. | |
5473c134 | 8093 | IFDEF: SQUID_SNMP |
8d6275c0 | 8094 | DOC_START |
5473c134 | 8095 | Allowing or denying access to the SNMP port. |
8d6275c0 | 8096 | |
5473c134 | 8097 | All access to the agent is denied by default. |
8098 | usage: | |
8d6275c0 | 8099 | |
5473c134 | 8100 | snmp_access allow|deny [!]aclname ... |
8d6275c0 | 8101 | |
b3567eb5 FC |
8102 | This clause only supports fast acl types. |
8103 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
638402dd | 8104 | |
5473c134 | 8105 | Example: |
8106 | snmp_access allow snmppublic localhost | |
8107 | snmp_access deny all | |
cccac0a2 | 8108 | DOC_END |
8109 | ||
5473c134 | 8110 | NAME: snmp_incoming_address |
8111 | TYPE: address | |
8112 | LOC: Config.Addrs.snmp_incoming | |
0eb08770 | 8113 | DEFAULT: any_addr |
638402dd | 8114 | DEFAULT_DOC: Accept SNMP packets from all machine interfaces. |
5473c134 | 8115 | IFDEF: SQUID_SNMP |
638402dd AJ |
8116 | DOC_START |
8117 | Just like 'udp_incoming_address', but for the SNMP port. | |
8118 | ||
8119 | snmp_incoming_address is used for the SNMP socket receiving | |
8120 | messages from SNMP agents. | |
8121 | ||
8122 | The default snmp_incoming_address is to listen on all | |
8123 | available network interfaces. | |
8124 | DOC_END | |
df2eec10 | 8125 | |
5473c134 | 8126 | NAME: snmp_outgoing_address |
8127 | TYPE: address | |
8128 | LOC: Config.Addrs.snmp_outgoing | |
0eb08770 | 8129 | DEFAULT: no_addr |
638402dd | 8130 | DEFAULT_DOC: Use snmp_incoming_address or an address selected by the operating system. |
5473c134 | 8131 | IFDEF: SQUID_SNMP |
cccac0a2 | 8132 | DOC_START |
638402dd | 8133 | Just like 'udp_outgoing_address', but for the SNMP port. |
cccac0a2 | 8134 | |
5473c134 | 8135 | snmp_outgoing_address is used for SNMP packets returned to SNMP |
8136 | agents. | |
cccac0a2 | 8137 | |
0eb08770 HN |
8138 | If snmp_outgoing_address is not set it will use the same socket |
8139 | as snmp_incoming_address. Only change this if you want to have | |
8140 | SNMP replies sent using another address than where this Squid | |
8141 | listens for SNMP queries. | |
cccac0a2 | 8142 | |
5473c134 | 8143 | NOTE, snmp_incoming_address and snmp_outgoing_address can not have |
638402dd | 8144 | the same value since they both use the same port. |
cccac0a2 | 8145 | DOC_END |
8146 | ||
5473c134 | 8147 | COMMENT_START |
8148 | ICP OPTIONS | |
8149 | ----------------------------------------------------------------------------- | |
8150 | COMMENT_END | |
8151 | ||
8152 | NAME: icp_port udp_port | |
ae870270 | 8153 | TYPE: u_short |
5473c134 | 8154 | DEFAULT: 0 |
638402dd | 8155 | DEFAULT_DOC: ICP disabled. |
5473c134 | 8156 | LOC: Config.Port.icp |
cccac0a2 | 8157 | DOC_START |
5473c134 | 8158 | The port number where Squid sends and receives ICP queries to |
8159 | and from neighbor caches. The standard UDP port for ICP is 3130. | |
e0855596 AJ |
8160 | |
8161 | Example: | |
8162 | icp_port @DEFAULT_ICP_PORT@ | |
cccac0a2 | 8163 | DOC_END |
8164 | ||
5473c134 | 8165 | NAME: htcp_port |
8166 | IFDEF: USE_HTCP | |
ae870270 | 8167 | TYPE: u_short |
87630341 | 8168 | DEFAULT: 0 |
638402dd | 8169 | DEFAULT_DOC: HTCP disabled. |
5473c134 | 8170 | LOC: Config.Port.htcp |
cccac0a2 | 8171 | DOC_START |
5473c134 | 8172 | The port number where Squid sends and receives HTCP queries to |
87630341 | 8173 | and from neighbor caches. To turn it on you want to set it to |
638402dd | 8174 | 4827. |
e0855596 AJ |
8175 | |
8176 | Example: | |
8177 | htcp_port 4827 | |
cccac0a2 | 8178 | DOC_END |
8179 | ||
8180 | NAME: log_icp_queries | |
8181 | COMMENT: on|off | |
8182 | TYPE: onoff | |
8183 | DEFAULT: on | |
8184 | LOC: Config.onoff.log_udp | |
8185 | DOC_START | |
8186 | If set, ICP queries are logged to access.log. You may wish | |
8187 | do disable this if your ICP load is VERY high to speed things | |
8188 | up or to simplify log analysis. | |
8189 | DOC_END | |
8190 | ||
5473c134 | 8191 | NAME: udp_incoming_address |
8192 | TYPE: address | |
8193 | LOC:Config.Addrs.udp_incoming | |
0eb08770 | 8194 | DEFAULT: any_addr |
638402dd | 8195 | DEFAULT_DOC: Accept packets from all machine interfaces. |
8524d4b2 | 8196 | DOC_START |
8197 | udp_incoming_address is used for UDP packets received from other | |
8198 | caches. | |
8199 | ||
8200 | The default behavior is to not bind to any specific address. | |
8201 | ||
8202 | Only change this if you want to have all UDP queries received on | |
8203 | a specific interface/address. | |
8204 | ||
8205 | NOTE: udp_incoming_address is used by the ICP, HTCP, and DNS | |
8206 | modules. Altering it will affect all of them in the same manner. | |
8207 | ||
8208 | see also; udp_outgoing_address | |
8209 | ||
8210 | NOTE, udp_incoming_address and udp_outgoing_address can not | |
8211 | have the same value since they both use the same port. | |
8212 | DOC_END | |
cccac0a2 | 8213 | |
5473c134 | 8214 | NAME: udp_outgoing_address |
8215 | TYPE: address | |
8216 | LOC: Config.Addrs.udp_outgoing | |
0eb08770 | 8217 | DEFAULT: no_addr |
638402dd | 8218 | DEFAULT_DOC: Use udp_incoming_address or an address selected by the operating system. |
cccac0a2 | 8219 | DOC_START |
8524d4b2 | 8220 | udp_outgoing_address is used for UDP packets sent out to other |
5473c134 | 8221 | caches. |
cccac0a2 | 8222 | |
5473c134 | 8223 | The default behavior is to not bind to any specific address. |
cccac0a2 | 8224 | |
8524d4b2 | 8225 | Instead it will use the same socket as udp_incoming_address. |
8226 | Only change this if you want to have UDP queries sent using another | |
8227 | address than where this Squid listens for UDP queries from other | |
5473c134 | 8228 | caches. |
8229 | ||
8524d4b2 | 8230 | NOTE: udp_outgoing_address is used by the ICP, HTCP, and DNS |
8231 | modules. Altering it will affect all of them in the same manner. | |
8232 | ||
8233 | see also; udp_incoming_address | |
8234 | ||
5473c134 | 8235 | NOTE, udp_incoming_address and udp_outgoing_address can not |
8524d4b2 | 8236 | have the same value since they both use the same port. |
cccac0a2 | 8237 | DOC_END |
8238 | ||
3d1e3e43 | 8239 | NAME: icp_hit_stale |
8240 | COMMENT: on|off | |
8241 | TYPE: onoff | |
8242 | DEFAULT: off | |
8243 | LOC: Config.onoff.icp_hit_stale | |
8244 | DOC_START | |
8245 | If you want to return ICP_HIT for stale cache objects, set this | |
8246 | option to 'on'. If you have sibling relationships with caches | |
8247 | in other administrative domains, this should be 'off'. If you only | |
8248 | have sibling relationships with caches under your control, | |
8249 | it is probably okay to set this to 'on'. | |
8250 | If set to 'on', your siblings should use the option "allow-miss" | |
8251 | on their cache_peer lines for connecting to you. | |
8252 | DOC_END | |
8253 | ||
5473c134 | 8254 | NAME: minimum_direct_hops |
cccac0a2 | 8255 | TYPE: int |
5473c134 | 8256 | DEFAULT: 4 |
8257 | LOC: Config.minDirectHops | |
cccac0a2 | 8258 | DOC_START |
5473c134 | 8259 | If using the ICMP pinging stuff, do direct fetches for sites |
8260 | which are no more than this many hops away. | |
cccac0a2 | 8261 | DOC_END |
8262 | ||
5473c134 | 8263 | NAME: minimum_direct_rtt |
638402dd | 8264 | COMMENT: (msec) |
5473c134 | 8265 | TYPE: int |
8266 | DEFAULT: 400 | |
8267 | LOC: Config.minDirectRtt | |
cccac0a2 | 8268 | DOC_START |
5473c134 | 8269 | If using the ICMP pinging stuff, do direct fetches for sites |
8270 | which are no more than this many rtt milliseconds away. | |
cccac0a2 | 8271 | DOC_END |
8272 | ||
cccac0a2 | 8273 | NAME: netdb_low |
8274 | TYPE: int | |
8275 | DEFAULT: 900 | |
8276 | LOC: Config.Netdb.low | |
638402dd AJ |
8277 | DOC_START |
8278 | The low water mark for the ICMP measurement database. | |
8279 | ||
8280 | Note: high watermark controlled by netdb_high directive. | |
8281 | ||
8282 | These watermarks are counts, not percents. The defaults are | |
8283 | (low) 900 and (high) 1000. When the high water mark is | |
8284 | reached, database entries will be deleted until the low | |
8285 | mark is reached. | |
8286 | DOC_END | |
cccac0a2 | 8287 | |
8288 | NAME: netdb_high | |
8289 | TYPE: int | |
8290 | DEFAULT: 1000 | |
8291 | LOC: Config.Netdb.high | |
8292 | DOC_START | |
638402dd AJ |
8293 | The high water mark for the ICMP measurement database. |
8294 | ||
8295 | Note: low watermark controlled by netdb_low directive. | |
8296 | ||
8297 | These watermarks are counts, not percents. The defaults are | |
8298 | (low) 900 and (high) 1000. When the high water mark is | |
8299 | reached, database entries will be deleted until the low | |
8300 | mark is reached. | |
cccac0a2 | 8301 | DOC_END |
8302 | ||
cccac0a2 | 8303 | NAME: netdb_ping_period |
8304 | TYPE: time_t | |
8305 | LOC: Config.Netdb.period | |
8306 | DEFAULT: 5 minutes | |
8307 | DOC_START | |
8308 | The minimum period for measuring a site. There will be at | |
8309 | least this much delay between successive pings to the same | |
8310 | network. The default is five minutes. | |
8311 | DOC_END | |
8312 | ||
cccac0a2 | 8313 | NAME: query_icmp |
8314 | COMMENT: on|off | |
8315 | TYPE: onoff | |
8316 | DEFAULT: off | |
8317 | LOC: Config.onoff.query_icmp | |
8318 | DOC_START | |
8319 | If you want to ask your peers to include ICMP data in their ICP | |
8320 | replies, enable this option. | |
8321 | ||
8322 | If your peer has configured Squid (during compilation) with | |
7f7db318 | 8323 | '--enable-icmp' that peer will send ICMP pings to origin server |
8324 | sites of the URLs it receives. If you enable this option the | |
cccac0a2 | 8325 | ICP replies from that peer will include the ICMP data (if available). |
8326 | Then, when choosing a parent cache, Squid will choose the parent with | |
8327 | the minimal RTT to the origin server. When this happens, the | |
8328 | hierarchy field of the access.log will be | |
8329 | "CLOSEST_PARENT_MISS". This option is off by default. | |
8330 | DOC_END | |
8331 | ||
8332 | NAME: test_reachability | |
8333 | COMMENT: on|off | |
8334 | TYPE: onoff | |
8335 | DEFAULT: off | |
8336 | LOC: Config.onoff.test_reachability | |
8337 | DOC_START | |
8338 | When this is 'on', ICP MISS replies will be ICP_MISS_NOFETCH | |
8339 | instead of ICP_MISS if the target host is NOT in the ICMP | |
8340 | database, or has a zero RTT. | |
8341 | DOC_END | |
8342 | ||
5473c134 | 8343 | NAME: icp_query_timeout |
8344 | COMMENT: (msec) | |
8345 | DEFAULT: 0 | |
638402dd | 8346 | DEFAULT_DOC: Dynamic detection. |
5473c134 | 8347 | TYPE: int |
8348 | LOC: Config.Timeout.icp_query | |
4c3ef9b2 | 8349 | DOC_START |
5473c134 | 8350 | Normally Squid will automatically determine an optimal ICP |
8351 | query timeout value based on the round-trip-time of recent ICP | |
8352 | queries. If you want to override the value determined by | |
8353 | Squid, set this 'icp_query_timeout' to a non-zero value. This | |
8354 | value is specified in MILLISECONDS, so, to use a 2-second | |
8355 | timeout (the old default), you would write: | |
4c3ef9b2 | 8356 | |
5473c134 | 8357 | icp_query_timeout 2000 |
4c3ef9b2 | 8358 | DOC_END |
8359 | ||
5473c134 | 8360 | NAME: maximum_icp_query_timeout |
8361 | COMMENT: (msec) | |
8362 | DEFAULT: 2000 | |
8363 | TYPE: int | |
8364 | LOC: Config.Timeout.icp_query_max | |
cccac0a2 | 8365 | DOC_START |
5473c134 | 8366 | Normally the ICP query timeout is determined dynamically. But |
8367 | sometimes it can lead to very large values (say 5 seconds). | |
8368 | Use this option to put an upper limit on the dynamic timeout | |
8369 | value. Do NOT use this option to always use a fixed (instead | |
8370 | of a dynamic) timeout value. To set a fixed timeout see the | |
8371 | 'icp_query_timeout' directive. | |
cccac0a2 | 8372 | DOC_END |
8373 | ||
5473c134 | 8374 | NAME: minimum_icp_query_timeout |
8375 | COMMENT: (msec) | |
8376 | DEFAULT: 5 | |
8377 | TYPE: int | |
8378 | LOC: Config.Timeout.icp_query_min | |
cccac0a2 | 8379 | DOC_START |
5473c134 | 8380 | Normally the ICP query timeout is determined dynamically. But |
8381 | sometimes it can lead to very small timeouts, even lower than | |
8382 | the normal latency variance on your link due to traffic. | |
8383 | Use this option to put an lower limit on the dynamic timeout | |
8384 | value. Do NOT use this option to always use a fixed (instead | |
8385 | of a dynamic) timeout value. To set a fixed timeout see the | |
8386 | 'icp_query_timeout' directive. | |
cccac0a2 | 8387 | DOC_END |
8388 | ||
5473c134 | 8389 | NAME: background_ping_rate |
8390 | COMMENT: time-units | |
8391 | TYPE: time_t | |
8392 | DEFAULT: 10 seconds | |
8393 | LOC: Config.backgroundPingRate | |
cccac0a2 | 8394 | DOC_START |
5473c134 | 8395 | Controls how often the ICP pings are sent to siblings that |
8396 | have background-ping set. | |
cccac0a2 | 8397 | DOC_END |
8398 | ||
5473c134 | 8399 | COMMENT_START |
8400 | MULTICAST ICP OPTIONS | |
8401 | ----------------------------------------------------------------------------- | |
8402 | COMMENT_END | |
8403 | ||
8404 | NAME: mcast_groups | |
8405 | TYPE: wordlist | |
8406 | LOC: Config.mcast_group_list | |
8c01ada0 | 8407 | DEFAULT: none |
8408 | DOC_START | |
5473c134 | 8409 | This tag specifies a list of multicast groups which your server |
8410 | should join to receive multicasted ICP queries. | |
8c01ada0 | 8411 | |
5473c134 | 8412 | NOTE! Be very careful what you put here! Be sure you |
8413 | understand the difference between an ICP _query_ and an ICP | |
8414 | _reply_. This option is to be set only if you want to RECEIVE | |
8415 | multicast queries. Do NOT set this option to SEND multicast | |
8416 | ICP (use cache_peer for that). ICP replies are always sent via | |
8417 | unicast, so this option does not affect whether or not you will | |
8418 | receive replies from multicast group members. | |
8c01ada0 | 8419 | |
5473c134 | 8420 | You must be very careful to NOT use a multicast address which |
8421 | is already in use by another group of caches. | |
8c01ada0 | 8422 | |
5473c134 | 8423 | If you are unsure about multicast, please read the Multicast |
8424 | chapter in the Squid FAQ (http://www.squid-cache.org/FAQ/). | |
8c01ada0 | 8425 | |
5473c134 | 8426 | Usage: mcast_groups 239.128.16.128 224.0.1.20 |
8c01ada0 | 8427 | |
5473c134 | 8428 | By default, Squid doesn't listen on any multicast groups. |
8429 | DOC_END | |
8c01ada0 | 8430 | |
5473c134 | 8431 | NAME: mcast_miss_addr |
8432 | IFDEF: MULTICAST_MISS_STREAM | |
8433 | TYPE: address | |
8434 | LOC: Config.mcast_miss.addr | |
0eb08770 | 8435 | DEFAULT: no_addr |
638402dd | 8436 | DEFAULT_DOC: disabled. |
5473c134 | 8437 | DOC_START |
8438 | If you enable this option, every "cache miss" URL will | |
8439 | be sent out on the specified multicast address. | |
cccac0a2 | 8440 | |
5473c134 | 8441 | Do not enable this option unless you are are absolutely |
8442 | certain you understand what you are doing. | |
cccac0a2 | 8443 | DOC_END |
8444 | ||
5473c134 | 8445 | NAME: mcast_miss_ttl |
8446 | IFDEF: MULTICAST_MISS_STREAM | |
ae870270 | 8447 | TYPE: u_short |
5473c134 | 8448 | LOC: Config.mcast_miss.ttl |
8449 | DEFAULT: 16 | |
cccac0a2 | 8450 | DOC_START |
5473c134 | 8451 | This is the time-to-live value for packets multicasted |
8452 | when multicasting off cache miss URLs is enabled. By | |
8453 | default this is set to 'site scope', i.e. 16. | |
8454 | DOC_END | |
cccac0a2 | 8455 | |
5473c134 | 8456 | NAME: mcast_miss_port |
8457 | IFDEF: MULTICAST_MISS_STREAM | |
ae870270 | 8458 | TYPE: u_short |
5473c134 | 8459 | LOC: Config.mcast_miss.port |
8460 | DEFAULT: 3135 | |
8461 | DOC_START | |
8462 | This is the port number to be used in conjunction with | |
8463 | 'mcast_miss_addr'. | |
8464 | DOC_END | |
cccac0a2 | 8465 | |
5473c134 | 8466 | NAME: mcast_miss_encode_key |
8467 | IFDEF: MULTICAST_MISS_STREAM | |
8468 | TYPE: string | |
8469 | LOC: Config.mcast_miss.encode_key | |
8470 | DEFAULT: XXXXXXXXXXXXXXXX | |
8471 | DOC_START | |
8472 | The URLs that are sent in the multicast miss stream are | |
8473 | encrypted. This is the encryption key. | |
8474 | DOC_END | |
8c01ada0 | 8475 | |
5473c134 | 8476 | NAME: mcast_icp_query_timeout |
8477 | COMMENT: (msec) | |
8478 | DEFAULT: 2000 | |
8479 | TYPE: int | |
8480 | LOC: Config.Timeout.mcast_icp_query | |
8481 | DOC_START | |
8482 | For multicast peers, Squid regularly sends out ICP "probes" to | |
8483 | count how many other peers are listening on the given multicast | |
8484 | address. This value specifies how long Squid should wait to | |
8485 | count all the replies. The default is 2000 msec, or 2 | |
8486 | seconds. | |
cccac0a2 | 8487 | DOC_END |
8488 | ||
5473c134 | 8489 | COMMENT_START |
8490 | INTERNAL ICON OPTIONS | |
8491 | ----------------------------------------------------------------------------- | |
8492 | COMMENT_END | |
8493 | ||
cccac0a2 | 8494 | NAME: icon_directory |
8495 | TYPE: string | |
8496 | LOC: Config.icons.directory | |
8497 | DEFAULT: @DEFAULT_ICON_DIR@ | |
8498 | DOC_START | |
8499 | Where the icons are stored. These are normally kept in | |
8500 | @DEFAULT_ICON_DIR@ | |
8501 | DOC_END | |
8502 | ||
f024c970 | 8503 | NAME: global_internal_static |
8504 | TYPE: onoff | |
8505 | LOC: Config.onoff.global_internal_static | |
8506 | DEFAULT: on | |
8507 | DOC_START | |
8508 | This directive controls is Squid should intercept all requests for | |
8509 | /squid-internal-static/ no matter which host the URL is requesting | |
8510 | (default on setting), or if nothing special should be done for | |
8511 | such URLs (off setting). The purpose of this directive is to make | |
8512 | icons etc work better in complex cache hierarchies where it may | |
8513 | not always be possible for all corners in the cache mesh to reach | |
8514 | the server generating a directory listing. | |
8515 | DOC_END | |
8516 | ||
5473c134 | 8517 | NAME: short_icon_urls |
8518 | TYPE: onoff | |
8519 | LOC: Config.icons.use_short_names | |
8520 | DEFAULT: on | |
8521 | DOC_START | |
8522 | If this is enabled Squid will use short URLs for icons. | |
8523 | If disabled it will revert to the old behavior of including | |
8524 | it's own name and port in the URL. | |
8525 | ||
8526 | If you run a complex cache hierarchy with a mix of Squid and | |
8527 | other proxies you may need to disable this directive. | |
8528 | DOC_END | |
8529 | ||
8530 | COMMENT_START | |
8531 | ERROR PAGE OPTIONS | |
8532 | ----------------------------------------------------------------------------- | |
8533 | COMMENT_END | |
8534 | ||
8535 | NAME: error_directory | |
8536 | TYPE: string | |
8537 | LOC: Config.errorDirectory | |
43000484 | 8538 | DEFAULT: none |
638402dd | 8539 | DEFAULT_DOC: Send error pages in the clients preferred language |
5473c134 | 8540 | DOC_START |
8541 | If you wish to create your own versions of the default | |
43000484 AJ |
8542 | error files to customize them to suit your company copy |
8543 | the error/template files to another directory and point | |
8544 | this tag at them. | |
8545 | ||
8546 | WARNING: This option will disable multi-language support | |
8547 | on error pages if used. | |
5473c134 | 8548 | |
8549 | The squid developers are interested in making squid available in | |
8550 | a wide variety of languages. If you are making translations for a | |
43000484 | 8551 | language that Squid does not currently provide please consider |
5473c134 | 8552 | contributing your translation back to the project. |
43000484 AJ |
8553 | http://wiki.squid-cache.org/Translations |
8554 | ||
8555 | The squid developers working on translations are happy to supply drop-in | |
8556 | translated error files in exchange for any new language contributions. | |
8557 | DOC_END | |
8558 | ||
8559 | NAME: error_default_language | |
8560 | IFDEF: USE_ERR_LOCALES | |
8561 | TYPE: string | |
8562 | LOC: Config.errorDefaultLanguage | |
8563 | DEFAULT: none | |
638402dd | 8564 | DEFAULT_DOC: Generate English language pages. |
43000484 AJ |
8565 | DOC_START |
8566 | Set the default language which squid will send error pages in | |
8567 | if no existing translation matches the clients language | |
8568 | preferences. | |
8569 | ||
8570 | If unset (default) generic English will be used. | |
8571 | ||
8572 | The squid developers are interested in making squid available in | |
8573 | a wide variety of languages. If you are interested in making | |
8574 | translations for any language see the squid wiki for details. | |
8575 | http://wiki.squid-cache.org/Translations | |
5473c134 | 8576 | DOC_END |
8577 | ||
c411820c AJ |
8578 | NAME: error_log_languages |
8579 | IFDEF: USE_ERR_LOCALES | |
8580 | TYPE: onoff | |
8581 | LOC: Config.errorLogMissingLanguages | |
8582 | DEFAULT: on | |
8583 | DOC_START | |
8584 | Log to cache.log what languages users are attempting to | |
8585 | auto-negotiate for translations. | |
8586 | ||
8587 | Successful negotiations are not logged. Only failures | |
8588 | have meaning to indicate that Squid may need an upgrade | |
0c49f10e | 8589 | of its error page translations. |
c411820c AJ |
8590 | DOC_END |
8591 | ||
5b52cb6c AJ |
8592 | NAME: err_page_stylesheet |
8593 | TYPE: string | |
8594 | LOC: Config.errorStylesheet | |
8595 | DEFAULT: @DEFAULT_CONFIG_DIR@/errorpage.css | |
8596 | DOC_START | |
8597 | CSS Stylesheet to pattern the display of Squid default error pages. | |
8598 | ||
8599 | For information on CSS see http://www.w3.org/Style/CSS/ | |
8600 | DOC_END | |
8601 | ||
5473c134 | 8602 | NAME: err_html_text |
8603 | TYPE: eol | |
8604 | LOC: Config.errHtmlText | |
8605 | DEFAULT: none | |
8606 | DOC_START | |
8607 | HTML text to include in error messages. Make this a "mailto" | |
8608 | URL to your admin address, or maybe just a link to your | |
8609 | organizations Web page. | |
8610 | ||
8611 | To include this in your error messages, you must rewrite | |
8612 | the error template files (found in the "errors" directory). | |
8613 | Wherever you want the 'err_html_text' line to appear, | |
8614 | insert a %L tag in the error template file. | |
8615 | DOC_END | |
8616 | ||
8617 | NAME: email_err_data | |
8618 | COMMENT: on|off | |
8619 | TYPE: onoff | |
8620 | LOC: Config.onoff.emailErrData | |
8621 | DEFAULT: on | |
8622 | DOC_START | |
8623 | If enabled, information about the occurred error will be | |
8624 | included in the mailto links of the ERR pages (if %W is set) | |
8625 | so that the email body contains the data. | |
8626 | Syntax is <A HREF="mailto:%w%W">%w</A> | |
8627 | DOC_END | |
8628 | ||
8629 | NAME: deny_info | |
8630 | TYPE: denyinfo | |
8631 | LOC: Config.denyInfoList | |
8632 | DEFAULT: none | |
8633 | DOC_START | |
8634 | Usage: deny_info err_page_name acl | |
8635 | or deny_info http://... acl | |
43000484 | 8636 | or deny_info TCP_RESET acl |
5473c134 | 8637 | |
8638 | This can be used to return a ERR_ page for requests which | |
8639 | do not pass the 'http_access' rules. Squid remembers the last | |
8640 | acl it evaluated in http_access, and if a 'deny_info' line exists | |
8641 | for that ACL Squid returns a corresponding error page. | |
8642 | ||
8643 | The acl is typically the last acl on the http_access deny line which | |
8644 | denied access. The exceptions to this rule are: | |
8645 | - When Squid needs to request authentication credentials. It's then | |
8646 | the first authentication related acl encountered | |
8647 | - When none of the http_access lines matches. It's then the last | |
8648 | acl processed on the last http_access line. | |
3af10ac0 AR |
8649 | - When the decision to deny access was made by an adaptation service, |
8650 | the acl name is the corresponding eCAP or ICAP service_name. | |
5473c134 | 8651 | |
43000484 AJ |
8652 | NP: If providing your own custom error pages with error_directory |
8653 | you may also specify them by your custom file name: | |
8654 | Example: deny_info ERR_CUSTOM_ACCESS_DENIED bad_guys | |
5473c134 | 8655 | |
aed9a15b AJ |
8656 | By defaut Squid will send "403 Forbidden". A different 4xx or 5xx |
8657 | may be specified by prefixing the file name with the code and a colon. | |
8658 | e.g. 404:ERR_CUSTOM_ACCESS_DENIED | |
8659 | ||
5473c134 | 8660 | Alternatively you can tell Squid to reset the TCP connection |
8661 | by specifying TCP_RESET. | |
15b02e9a AJ |
8662 | |
8663 | Or you can specify an error URL or URL pattern. The browsers will | |
aed9a15b AJ |
8664 | get redirected to the specified URL after formatting tags have |
8665 | been replaced. Redirect will be done with 302 or 307 according to | |
8666 | HTTP/1.1 specs. A different 3xx code may be specified by prefixing | |
8667 | the URL. e.g. 303:http://example.com/ | |
15b02e9a AJ |
8668 | |
8669 | URL FORMAT TAGS: | |
8670 | %a - username (if available. Password NOT included) | |
ea35939b | 8671 | %A - Local listening IP address the client connection was connected to |
15b02e9a AJ |
8672 | %B - FTP path URL |
8673 | %e - Error number | |
8674 | %E - Error description | |
8675 | %h - Squid hostname | |
8676 | %H - Request domain name | |
8677 | %i - Client IP Address | |
8678 | %M - Request Method | |
05dbf66c | 8679 | %O - Unescaped message result from external ACL helper |
15b02e9a AJ |
8680 | %o - Message result from external ACL helper |
8681 | %p - Request Port number | |
8682 | %P - Request Protocol name | |
8683 | %R - Request URL path | |
8684 | %T - Timestamp in RFC 1123 format | |
8685 | %U - Full canonical URL from client | |
8686 | (HTTPS URLs terminate with *) | |
8687 | %u - Full canonical URL from client | |
8688 | %w - Admin email from squid.conf | |
e4a8468d | 8689 | %x - Error name |
15b02e9a AJ |
8690 | %% - Literal percent (%) code |
8691 | ||
5473c134 | 8692 | DOC_END |
8693 | ||
8694 | COMMENT_START | |
8695 | OPTIONS INFLUENCING REQUEST FORWARDING | |
8696 | ----------------------------------------------------------------------------- | |
8697 | COMMENT_END | |
8698 | ||
8699 | NAME: nonhierarchical_direct | |
e72a0ec0 | 8700 | TYPE: onoff |
5473c134 | 8701 | LOC: Config.onoff.nonhierarchical_direct |
e72a0ec0 | 8702 | DEFAULT: on |
8703 | DOC_START | |
5473c134 | 8704 | By default, Squid will send any non-hierarchical requests |
9967aef6 | 8705 | (not cacheable request type) direct to origin servers. |
e72a0ec0 | 8706 | |
638402dd | 8707 | When this is set to "off", Squid will prefer to send these |
5473c134 | 8708 | requests to parents. |
0b0cfcf2 | 8709 | |
5473c134 | 8710 | Note that in most configurations, by turning this off you will only |
8711 | add latency to these request without any improvement in global hit | |
8712 | ratio. | |
0b0cfcf2 | 8713 | |
638402dd AJ |
8714 | This option only sets a preference. If the parent is unavailable a |
8715 | direct connection to the origin server may still be attempted. To | |
8716 | completely prevent direct connections use never_direct. | |
8d6275c0 | 8717 | DOC_END |
0b0cfcf2 | 8718 | |
5473c134 | 8719 | NAME: prefer_direct |
8d6275c0 | 8720 | TYPE: onoff |
5473c134 | 8721 | LOC: Config.onoff.prefer_direct |
8d6275c0 | 8722 | DEFAULT: off |
8723 | DOC_START | |
5473c134 | 8724 | Normally Squid tries to use parents for most requests. If you for some |
8725 | reason like it to first try going direct and only use a parent if | |
8726 | going direct fails set this to on. | |
0b0cfcf2 | 8727 | |
5473c134 | 8728 | By combining nonhierarchical_direct off and prefer_direct on you |
8729 | can set up Squid to use a parent as a backup path if going direct | |
8730 | fails. | |
8731 | ||
8732 | Note: If you want Squid to use parents for all requests see | |
8733 | the never_direct directive. prefer_direct only modifies how Squid | |
8734 | acts on cacheable requests. | |
cccac0a2 | 8735 | DOC_END |
8736 | ||
96598f93 AJ |
8737 | NAME: cache_miss_revalidate |
8738 | COMMENT: on|off | |
8739 | TYPE: onoff | |
8740 | DEFAULT: on | |
8741 | LOC: Config.onoff.cache_miss_revalidate | |
8742 | DOC_START | |
2d4eefd9 AJ |
8743 | RFC 7232 defines a conditional request mechanism to prevent |
8744 | response objects being unnecessarily transferred over the network. | |
8745 | If that mechanism is used by the client and a cache MISS occurs | |
8746 | it can prevent new cache entries being created. | |
8747 | ||
8748 | This option determines whether Squid on cache MISS will pass the | |
8749 | client revalidation request to the server or tries to fetch new | |
8750 | content for caching. It can be useful while the cache is mostly | |
8751 | empty to more quickly have the cache populated by generating | |
8752 | non-conditional GETs. | |
96598f93 AJ |
8753 | |
8754 | When set to 'on' (default), Squid will pass all client If-* headers | |
2d4eefd9 AJ |
8755 | to the server. This permits server responses without a cacheable |
8756 | payload to be delivered and on MISS no new cache entry is created. | |
96598f93 AJ |
8757 | |
8758 | When set to 'off' and if the request is cacheable, Squid will | |
8759 | remove the clients If-Modified-Since and If-None-Match headers from | |
2d4eefd9 AJ |
8760 | the request sent to the server. This requests a 200 status response |
8761 | from the server to create a new cache entry with. | |
96598f93 AJ |
8762 | DOC_END |
8763 | ||
5473c134 | 8764 | NAME: always_direct |
8d6275c0 | 8765 | TYPE: acl_access |
5473c134 | 8766 | LOC: Config.accessList.AlwaysDirect |
0b0cfcf2 | 8767 | DEFAULT: none |
638402dd | 8768 | DEFAULT_DOC: Prevent any cache_peer being used for this request. |
0b0cfcf2 | 8769 | DOC_START |
5473c134 | 8770 | Usage: always_direct allow|deny [!]aclname ... |
0b0cfcf2 | 8771 | |
5473c134 | 8772 | Here you can use ACL elements to specify requests which should |
8773 | ALWAYS be forwarded by Squid to the origin servers without using | |
8774 | any peers. For example, to always directly forward requests for | |
8775 | local servers ignoring any parents or siblings you may have use | |
8776 | something like: | |
0b0cfcf2 | 8777 | |
5473c134 | 8778 | acl local-servers dstdomain my.domain.net |
8779 | always_direct allow local-servers | |
0b0cfcf2 | 8780 | |
5473c134 | 8781 | To always forward FTP requests directly, use |
f16fbc82 | 8782 | |
5473c134 | 8783 | acl FTP proto FTP |
8784 | always_direct allow FTP | |
cccac0a2 | 8785 | |
5473c134 | 8786 | NOTE: There is a similar, but opposite option named |
8787 | 'never_direct'. You need to be aware that "always_direct deny | |
8788 | foo" is NOT the same thing as "never_direct allow foo". You | |
8789 | may need to use a deny rule to exclude a more-specific case of | |
8790 | some other rule. Example: | |
8d6275c0 | 8791 | |
5473c134 | 8792 | acl local-external dstdomain external.foo.net |
8793 | acl local-servers dstdomain .foo.net | |
8794 | always_direct deny local-external | |
8795 | always_direct allow local-servers | |
8d6275c0 | 8796 | |
5473c134 | 8797 | NOTE: If your goal is to make the client forward the request |
8798 | directly to the origin server bypassing Squid then this needs | |
8799 | to be done in the client configuration. Squid configuration | |
8800 | can only tell Squid how Squid should fetch the object. | |
8d6275c0 | 8801 | |
5473c134 | 8802 | NOTE: This directive is not related to caching. The replies |
8803 | is cached as usual even if you use always_direct. To not cache | |
b3567eb5 | 8804 | the replies see the 'cache' directive. |
5473c134 | 8805 | |
b3567eb5 FC |
8806 | This clause supports both fast and slow acl types. |
8807 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
cccac0a2 | 8808 | DOC_END |
0976f8db | 8809 | |
5473c134 | 8810 | NAME: never_direct |
8811 | TYPE: acl_access | |
8812 | LOC: Config.accessList.NeverDirect | |
8813 | DEFAULT: none | |
638402dd | 8814 | DEFAULT_DOC: Allow DNS results to be used for this request. |
8d6275c0 | 8815 | DOC_START |
5473c134 | 8816 | Usage: never_direct allow|deny [!]aclname ... |
8817 | ||
8818 | never_direct is the opposite of always_direct. Please read | |
8819 | the description for always_direct if you have not already. | |
8820 | ||
8821 | With 'never_direct' you can use ACL elements to specify | |
8822 | requests which should NEVER be forwarded directly to origin | |
8823 | servers. For example, to force the use of a proxy for all | |
8824 | requests, except those in your local domain use something like: | |
8825 | ||
8826 | acl local-servers dstdomain .foo.net | |
5473c134 | 8827 | never_direct deny local-servers |
8828 | never_direct allow all | |
8829 | ||
8830 | or if Squid is inside a firewall and there are local intranet | |
8831 | servers inside the firewall use something like: | |
8832 | ||
8833 | acl local-intranet dstdomain .foo.net | |
8834 | acl local-external dstdomain external.foo.net | |
8835 | always_direct deny local-external | |
8836 | always_direct allow local-intranet | |
8837 | never_direct allow all | |
8838 | ||
b3567eb5 FC |
8839 | This clause supports both fast and slow acl types. |
8840 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
8d6275c0 | 8841 | DOC_END |
0976f8db | 8842 | |
5473c134 | 8843 | COMMENT_START |
8844 | ADVANCED NETWORKING OPTIONS | |
8845 | ----------------------------------------------------------------------------- | |
8846 | COMMENT_END | |
8847 | ||
65d448bc | 8848 | NAME: incoming_udp_average incoming_icp_average |
cccac0a2 | 8849 | TYPE: int |
8850 | DEFAULT: 6 | |
65d448bc AJ |
8851 | LOC: Config.comm_incoming.udp.average |
8852 | DOC_START | |
8853 | Heavy voodoo here. I can't even believe you are reading this. | |
8854 | Are you crazy? Don't even think about adjusting these unless | |
8855 | you understand the algorithms in comm_select.c first! | |
8856 | DOC_END | |
cccac0a2 | 8857 | |
65d448bc | 8858 | NAME: incoming_tcp_average incoming_http_average |
cccac0a2 | 8859 | TYPE: int |
8860 | DEFAULT: 4 | |
65d448bc AJ |
8861 | LOC: Config.comm_incoming.tcp.average |
8862 | DOC_START | |
8863 | Heavy voodoo here. I can't even believe you are reading this. | |
8864 | Are you crazy? Don't even think about adjusting these unless | |
8865 | you understand the algorithms in comm_select.c first! | |
8866 | DOC_END | |
cccac0a2 | 8867 | |
8868 | NAME: incoming_dns_average | |
8869 | TYPE: int | |
8870 | DEFAULT: 4 | |
65d448bc AJ |
8871 | LOC: Config.comm_incoming.dns.average |
8872 | DOC_START | |
8873 | Heavy voodoo here. I can't even believe you are reading this. | |
8874 | Are you crazy? Don't even think about adjusting these unless | |
8875 | you understand the algorithms in comm_select.c first! | |
8876 | DOC_END | |
cccac0a2 | 8877 | |
65d448bc | 8878 | NAME: min_udp_poll_cnt min_icp_poll_cnt |
cccac0a2 | 8879 | TYPE: int |
8880 | DEFAULT: 8 | |
65d448bc AJ |
8881 | LOC: Config.comm_incoming.udp.min_poll |
8882 | DOC_START | |
8883 | Heavy voodoo here. I can't even believe you are reading this. | |
8884 | Are you crazy? Don't even think about adjusting these unless | |
8885 | you understand the algorithms in comm_select.c first! | |
8886 | DOC_END | |
cccac0a2 | 8887 | |
8888 | NAME: min_dns_poll_cnt | |
8889 | TYPE: int | |
8890 | DEFAULT: 8 | |
65d448bc AJ |
8891 | LOC: Config.comm_incoming.dns.min_poll |
8892 | DOC_START | |
8893 | Heavy voodoo here. I can't even believe you are reading this. | |
8894 | Are you crazy? Don't even think about adjusting these unless | |
8895 | you understand the algorithms in comm_select.c first! | |
8896 | DOC_END | |
cccac0a2 | 8897 | |
65d448bc | 8898 | NAME: min_tcp_poll_cnt min_http_poll_cnt |
cccac0a2 | 8899 | TYPE: int |
8900 | DEFAULT: 8 | |
65d448bc | 8901 | LOC: Config.comm_incoming.tcp.min_poll |
cccac0a2 | 8902 | DOC_START |
5473c134 | 8903 | Heavy voodoo here. I can't even believe you are reading this. |
8904 | Are you crazy? Don't even think about adjusting these unless | |
8905 | you understand the algorithms in comm_select.c first! | |
8906 | DOC_END | |
8907 | ||
8908 | NAME: accept_filter | |
5473c134 | 8909 | TYPE: string |
8910 | DEFAULT: none | |
8911 | LOC: Config.accept_filter | |
8912 | DOC_START | |
0b4d4be5 | 8913 | FreeBSD: |
8914 | ||
5473c134 | 8915 | The name of an accept(2) filter to install on Squid's |
8916 | listen socket(s). This feature is perhaps specific to | |
8917 | FreeBSD and requires support in the kernel. | |
8918 | ||
8919 | The 'httpready' filter delays delivering new connections | |
2324cda2 | 8920 | to Squid until a full HTTP request has been received. |
0b4d4be5 | 8921 | See the accf_http(9) man page for details. |
8922 | ||
8923 | The 'dataready' filter delays delivering new connections | |
8924 | to Squid until there is some data to process. | |
8925 | See the accf_dataready(9) man page for details. | |
8926 | ||
8927 | Linux: | |
8928 | ||
8929 | The 'data' filter delays delivering of new connections | |
8930 | to Squid until there is some data to process by TCP_ACCEPT_DEFER. | |
8931 | You may optionally specify a number of seconds to wait by | |
8932 | 'data=N' where N is the number of seconds. Defaults to 30 | |
8933 | if not specified. See the tcp(7) man page for details. | |
5473c134 | 8934 | EXAMPLE: |
0b4d4be5 | 8935 | # FreeBSD |
5473c134 | 8936 | accept_filter httpready |
0b4d4be5 | 8937 | # Linux |
8938 | accept_filter data | |
5473c134 | 8939 | DOC_END |
8940 | ||
ab2ecb0e AJ |
8941 | NAME: client_ip_max_connections |
8942 | TYPE: int | |
8943 | LOC: Config.client_ip_max_connections | |
8944 | DEFAULT: -1 | |
638402dd | 8945 | DEFAULT_DOC: No limit. |
ab2ecb0e AJ |
8946 | DOC_START |
8947 | Set an absolute limit on the number of connections a single | |
8948 | client IP can use. Any more than this and Squid will begin to drop | |
8949 | new connections from the client until it closes some links. | |
8950 | ||
8951 | Note that this is a global limit. It affects all HTTP, HTCP, Gopher and FTP | |
8952 | connections from the client. For finer control use the ACL access controls. | |
8953 | ||
8954 | Requires client_db to be enabled (the default). | |
8955 | ||
8956 | WARNING: This may noticably slow down traffic received via external proxies | |
8957 | or NAT devices and cause them to rebound error messages back to their clients. | |
8958 | DOC_END | |
8959 | ||
5473c134 | 8960 | NAME: tcp_recv_bufsize |
8961 | COMMENT: (bytes) | |
8962 | TYPE: b_size_t | |
8963 | DEFAULT: 0 bytes | |
638402dd | 8964 | DEFAULT_DOC: Use operating system TCP defaults. |
5473c134 | 8965 | LOC: Config.tcpRcvBufsz |
8966 | DOC_START | |
8967 | Size of receive buffer to set for TCP sockets. Probably just | |
638402dd AJ |
8968 | as easy to change your kernel's default. |
8969 | Omit from squid.conf to use the default buffer size. | |
5473c134 | 8970 | DOC_END |
8971 | ||
8972 | COMMENT_START | |
8973 | ICAP OPTIONS | |
8974 | ----------------------------------------------------------------------------- | |
8975 | COMMENT_END | |
8976 | ||
8977 | NAME: icap_enable | |
8978 | TYPE: onoff | |
8979 | IFDEF: ICAP_CLIENT | |
8980 | COMMENT: on|off | |
26cc52cb | 8981 | LOC: Adaptation::Icap::TheConfig.onoff |
5473c134 | 8982 | DEFAULT: off |
8983 | DOC_START | |
53e738c6 | 8984 | If you want to enable the ICAP module support, set this to on. |
5473c134 | 8985 | DOC_END |
8986 | ||
8987 | NAME: icap_connect_timeout | |
8988 | TYPE: time_t | |
8989 | DEFAULT: none | |
26cc52cb | 8990 | LOC: Adaptation::Icap::TheConfig.connect_timeout_raw |
5473c134 | 8991 | IFDEF: ICAP_CLIENT |
8992 | DOC_START | |
8993 | This parameter specifies how long to wait for the TCP connect to | |
8994 | the requested ICAP server to complete before giving up and either | |
8995 | terminating the HTTP transaction or bypassing the failure. | |
8996 | ||
8997 | The default for optional services is peer_connect_timeout. | |
8998 | The default for essential services is connect_timeout. | |
8999 | If this option is explicitly set, its value applies to all services. | |
9000 | DOC_END | |
9001 | ||
9002 | NAME: icap_io_timeout | |
9003 | COMMENT: time-units | |
9004 | TYPE: time_t | |
9005 | DEFAULT: none | |
638402dd | 9006 | DEFAULT_DOC: Use read_timeout. |
26cc52cb | 9007 | LOC: Adaptation::Icap::TheConfig.io_timeout_raw |
5473c134 | 9008 | IFDEF: ICAP_CLIENT |
9009 | DOC_START | |
9010 | This parameter specifies how long to wait for an I/O activity on | |
9011 | an established, active ICAP connection before giving up and | |
9012 | either terminating the HTTP transaction or bypassing the | |
9013 | failure. | |
5473c134 | 9014 | DOC_END |
9015 | ||
9016 | NAME: icap_service_failure_limit | |
8277060a CT |
9017 | COMMENT: limit [in memory-depth time-units] |
9018 | TYPE: icap_service_failure_limit | |
5473c134 | 9019 | IFDEF: ICAP_CLIENT |
8277060a | 9020 | LOC: Adaptation::Icap::TheConfig |
5473c134 | 9021 | DEFAULT: 10 |
9022 | DOC_START | |
9023 | The limit specifies the number of failures that Squid tolerates | |
9024 | when establishing a new TCP connection with an ICAP service. If | |
9025 | the number of failures exceeds the limit, the ICAP service is | |
9026 | not used for new ICAP requests until it is time to refresh its | |
8277060a | 9027 | OPTIONS. |
5473c134 | 9028 | |
9029 | A negative value disables the limit. Without the limit, an ICAP | |
9030 | service will not be considered down due to connectivity failures | |
9031 | between ICAP OPTIONS requests. | |
8277060a CT |
9032 | |
9033 | Squid forgets ICAP service failures older than the specified | |
9034 | value of memory-depth. The memory fading algorithm | |
9035 | is approximate because Squid does not remember individual | |
9036 | errors but groups them instead, splitting the option | |
9037 | value into ten time slots of equal length. | |
9038 | ||
9039 | When memory-depth is 0 and by default this option has no | |
9040 | effect on service failure expiration. | |
9041 | ||
9042 | Squid always forgets failures when updating service settings | |
9043 | using an ICAP OPTIONS transaction, regardless of this option | |
9044 | setting. | |
9045 | ||
9046 | For example, | |
9047 | # suspend service usage after 10 failures in 5 seconds: | |
9048 | icap_service_failure_limit 10 in 5 seconds | |
cccac0a2 | 9049 | DOC_END |
9050 | ||
5473c134 | 9051 | NAME: icap_service_revival_delay |
cccac0a2 | 9052 | TYPE: int |
5473c134 | 9053 | IFDEF: ICAP_CLIENT |
26cc52cb | 9054 | LOC: Adaptation::Icap::TheConfig.service_revival_delay |
5473c134 | 9055 | DEFAULT: 180 |
cccac0a2 | 9056 | DOC_START |
5473c134 | 9057 | The delay specifies the number of seconds to wait after an ICAP |
9058 | OPTIONS request failure before requesting the options again. The | |
9059 | failed ICAP service is considered "down" until fresh OPTIONS are | |
9060 | fetched. | |
cccac0a2 | 9061 | |
5473c134 | 9062 | The actual delay cannot be smaller than the hardcoded minimum |
9063 | delay of 30 seconds. | |
cccac0a2 | 9064 | DOC_END |
9065 | ||
5473c134 | 9066 | NAME: icap_preview_enable |
cccac0a2 | 9067 | TYPE: onoff |
5473c134 | 9068 | IFDEF: ICAP_CLIENT |
9069 | COMMENT: on|off | |
26cc52cb | 9070 | LOC: Adaptation::Icap::TheConfig.preview_enable |
ac7a62f9 | 9071 | DEFAULT: on |
cccac0a2 | 9072 | DOC_START |
ac7a62f9 | 9073 | The ICAP Preview feature allows the ICAP server to handle the |
9074 | HTTP message by looking only at the beginning of the message body | |
9075 | or even without receiving the body at all. In some environments, | |
9076 | previews greatly speedup ICAP processing. | |
9077 | ||
9078 | During an ICAP OPTIONS transaction, the server may tell Squid what | |
9079 | HTTP messages should be previewed and how big the preview should be. | |
9080 | Squid will not use Preview if the server did not request one. | |
9081 | ||
9082 | To disable ICAP Preview for all ICAP services, regardless of | |
9083 | individual ICAP server OPTIONS responses, set this option to "off". | |
9084 | Example: | |
9085 | icap_preview_enable off | |
cccac0a2 | 9086 | DOC_END |
9087 | ||
5473c134 | 9088 | NAME: icap_preview_size |
9089 | TYPE: int | |
9090 | IFDEF: ICAP_CLIENT | |
26cc52cb | 9091 | LOC: Adaptation::Icap::TheConfig.preview_size |
5473c134 | 9092 | DEFAULT: -1 |
638402dd | 9093 | DEFAULT_DOC: No preview sent. |
cccac0a2 | 9094 | DOC_START |
53e738c6 | 9095 | The default size of preview data to be sent to the ICAP server. |
638402dd | 9096 | This value might be overwritten on a per server basis by OPTIONS requests. |
cccac0a2 | 9097 | DOC_END |
9098 | ||
83c51da9 CT |
9099 | NAME: icap_206_enable |
9100 | TYPE: onoff | |
9101 | IFDEF: ICAP_CLIENT | |
9102 | COMMENT: on|off | |
9103 | LOC: Adaptation::Icap::TheConfig.allow206_enable | |
9104 | DEFAULT: on | |
9105 | DOC_START | |
9106 | 206 (Partial Content) responses is an ICAP extension that allows the | |
9107 | ICAP agents to optionally combine adapted and original HTTP message | |
9108 | content. The decision to combine is postponed until the end of the | |
9109 | ICAP response. Squid supports Partial Content extension by default. | |
9110 | ||
9111 | Activation of the Partial Content extension is negotiated with each | |
9112 | ICAP service during OPTIONS exchange. Most ICAP servers should handle | |
9113 | negotation correctly even if they do not support the extension, but | |
9114 | some might fail. To disable Partial Content support for all ICAP | |
9115 | services and to avoid any negotiation, set this option to "off". | |
9116 | ||
9117 | Example: | |
9118 | icap_206_enable off | |
9119 | DOC_END | |
9120 | ||
5473c134 | 9121 | NAME: icap_default_options_ttl |
9122 | TYPE: int | |
9123 | IFDEF: ICAP_CLIENT | |
26cc52cb | 9124 | LOC: Adaptation::Icap::TheConfig.default_options_ttl |
5473c134 | 9125 | DEFAULT: 60 |
cccac0a2 | 9126 | DOC_START |
53e738c6 | 9127 | The default TTL value for ICAP OPTIONS responses that don't have |
5473c134 | 9128 | an Options-TTL header. |
cccac0a2 | 9129 | DOC_END |
9130 | ||
5473c134 | 9131 | NAME: icap_persistent_connections |
9132 | TYPE: onoff | |
9133 | IFDEF: ICAP_CLIENT | |
9134 | COMMENT: on|off | |
26cc52cb | 9135 | LOC: Adaptation::Icap::TheConfig.reuse_connections |
5473c134 | 9136 | DEFAULT: on |
cccac0a2 | 9137 | DOC_START |
5473c134 | 9138 | Whether or not Squid should use persistent connections to |
9139 | an ICAP server. | |
cccac0a2 | 9140 | DOC_END |
9141 | ||
22fff3bf | 9142 | NAME: adaptation_send_client_ip icap_send_client_ip |
5473c134 | 9143 | TYPE: onoff |
22fff3bf | 9144 | IFDEF: USE_ADAPTATION |
5473c134 | 9145 | COMMENT: on|off |
22fff3bf | 9146 | LOC: Adaptation::Config::send_client_ip |
5473c134 | 9147 | DEFAULT: off |
cccac0a2 | 9148 | DOC_START |
ea3ae478 AR |
9149 | If enabled, Squid shares HTTP client IP information with adaptation |
9150 | services. For ICAP, Squid adds the X-Client-IP header to ICAP requests. | |
9151 | For eCAP, Squid sets the libecap::metaClientIp transaction option. | |
9152 | ||
9153 | See also: adaptation_uses_indirect_client | |
cccac0a2 | 9154 | DOC_END |
9155 | ||
22fff3bf | 9156 | NAME: adaptation_send_username icap_send_client_username |
5473c134 | 9157 | TYPE: onoff |
22fff3bf | 9158 | IFDEF: USE_ADAPTATION |
5473c134 | 9159 | COMMENT: on|off |
22fff3bf | 9160 | LOC: Adaptation::Config::send_username |
5473c134 | 9161 | DEFAULT: off |
cccac0a2 | 9162 | DOC_START |
5473c134 | 9163 | This sends authenticated HTTP client username (if available) to |
22fff3bf AR |
9164 | the adaptation service. |
9165 | ||
9166 | For ICAP, the username value is encoded based on the | |
5473c134 | 9167 | icap_client_username_encode option and is sent using the header |
9168 | specified by the icap_client_username_header option. | |
cccac0a2 | 9169 | DOC_END |
9170 | ||
5473c134 | 9171 | NAME: icap_client_username_header |
cccac0a2 | 9172 | TYPE: string |
5473c134 | 9173 | IFDEF: ICAP_CLIENT |
26cc52cb | 9174 | LOC: Adaptation::Icap::TheConfig.client_username_header |
5473c134 | 9175 | DEFAULT: X-Client-Username |
cccac0a2 | 9176 | DOC_START |
db49f682 | 9177 | ICAP request header name to use for adaptation_send_username. |
cccac0a2 | 9178 | DOC_END |
9179 | ||
5473c134 | 9180 | NAME: icap_client_username_encode |
cccac0a2 | 9181 | TYPE: onoff |
5473c134 | 9182 | IFDEF: ICAP_CLIENT |
9183 | COMMENT: on|off | |
26cc52cb | 9184 | LOC: Adaptation::Icap::TheConfig.client_username_encode |
5473c134 | 9185 | DEFAULT: off |
cccac0a2 | 9186 | DOC_START |
5473c134 | 9187 | Whether to base64 encode the authenticated client username. |
cccac0a2 | 9188 | DOC_END |
9189 | ||
5473c134 | 9190 | NAME: icap_service |
9191 | TYPE: icap_service_type | |
9192 | IFDEF: ICAP_CLIENT | |
26cc52cb | 9193 | LOC: Adaptation::Icap::TheConfig |
5473c134 | 9194 | DEFAULT: none |
cccac0a2 | 9195 | DOC_START |
a22e6cd3 | 9196 | Defines a single ICAP service using the following format: |
cccac0a2 | 9197 | |
c25c2836 | 9198 | icap_service id vectoring_point uri [option ...] |
7d90757b | 9199 | |
c25c2836 CT |
9200 | id: ID |
9201 | an opaque identifier or name which is used to direct traffic to | |
9202 | this specific service. Must be unique among all adaptation | |
9203 | services in squid.conf. | |
a22e6cd3 AR |
9204 | |
9205 | vectoring_point: reqmod_precache|reqmod_postcache|respmod_precache|respmod_postcache | |
f3db09e2 | 9206 | This specifies at which point of transaction processing the |
9207 | ICAP service should be activated. *_postcache vectoring points | |
9208 | are not yet supported. | |
a22e6cd3 | 9209 | |
c25c2836 | 9210 | uri: icap://servername:port/servicepath |
a22e6cd3 | 9211 | ICAP server and service location. |
1b091aec CT |
9212 | icaps://servername:port/servicepath |
9213 | The "icap:" URI scheme is used for traditional ICAP server and | |
9214 | service location (default port is 1344, connections are not | |
9215 | encrypted). The "icaps:" URI scheme is for Secure ICAP | |
9216 | services that use SSL/TLS-encrypted ICAP connections (by | |
9217 | default, on port 11344). | |
a22e6cd3 AR |
9218 | |
9219 | ICAP does not allow a single service to handle both REQMOD and RESPMOD | |
9220 | transactions. Squid does not enforce that requirement. You can specify | |
9221 | services with the same service_url and different vectoring_points. You | |
9222 | can even specify multiple identical services as long as their | |
9223 | service_names differ. | |
9224 | ||
3caa16d2 AR |
9225 | To activate a service, use the adaptation_access directive. To group |
9226 | services, use adaptation_service_chain and adaptation_service_set. | |
a22e6cd3 AR |
9227 | |
9228 | Service options are separated by white space. ICAP services support | |
9229 | the following name=value options: | |
9230 | ||
9231 | bypass=on|off|1|0 | |
9232 | If set to 'on' or '1', the ICAP service is treated as | |
9233 | optional. If the service cannot be reached or malfunctions, | |
9234 | Squid will try to ignore any errors and process the message as | |
9235 | if the service was not enabled. No all ICAP errors can be | |
9236 | bypassed. If set to 0, the ICAP service is treated as | |
9237 | essential and all ICAP errors will result in an error page | |
9238 | returned to the HTTP client. | |
9239 | ||
9240 | Bypass is off by default: services are treated as essential. | |
9241 | ||
9242 | routing=on|off|1|0 | |
9243 | If set to 'on' or '1', the ICAP service is allowed to | |
9244 | dynamically change the current message adaptation plan by | |
9245 | returning a chain of services to be used next. The services | |
9246 | are specified using the X-Next-Services ICAP response header | |
9247 | value, formatted as a comma-separated list of service names. | |
e2851fe7 AR |
9248 | Each named service should be configured in squid.conf. Other |
9249 | services are ignored. An empty X-Next-Services value results | |
9250 | in an empty plan which ends the current adaptation. | |
9251 | ||
9252 | Dynamic adaptation plan may cross or cover multiple supported | |
9253 | vectoring points in their natural processing order. | |
a22e6cd3 AR |
9254 | |
9255 | Routing is not allowed by default: the ICAP X-Next-Services | |
9256 | response header is ignored. | |
9257 | ||
e6713f4e AJ |
9258 | ipv6=on|off |
9259 | Only has effect on split-stack systems. The default on those systems | |
9260 | is to use IPv4-only connections. When set to 'on' this option will | |
9261 | make Squid use IPv6-only connections to contact this ICAP service. | |
9262 | ||
2dba5b8e CT |
9263 | on-overload=block|bypass|wait|force |
9264 | If the service Max-Connections limit has been reached, do | |
9265 | one of the following for each new ICAP transaction: | |
9266 | * block: send an HTTP error response to the client | |
9267 | * bypass: ignore the "over-connected" ICAP service | |
9268 | * wait: wait (in a FIFO queue) for an ICAP connection slot | |
9269 | * force: proceed, ignoring the Max-Connections limit | |
9270 | ||
9271 | In SMP mode with N workers, each worker assumes the service | |
9272 | connection limit is Max-Connections/N, even though not all | |
9273 | workers may use a given service. | |
9274 | ||
9275 | The default value is "bypass" if service is bypassable, | |
9276 | otherwise it is set to "wait". | |
9277 | ||
9278 | ||
9279 | max-conn=number | |
9280 | Use the given number as the Max-Connections limit, regardless | |
9281 | of the Max-Connections value given by the service, if any. | |
9282 | ||
88df846b CT |
9283 | connection-encryption=on|off |
9284 | Determines the ICAP service effect on the connections_encrypted | |
9285 | ACL. | |
9286 | ||
9287 | The default is "on" for Secure ICAP services (i.e., those | |
9288 | with the icaps:// service URIs scheme) and "off" for plain ICAP | |
9289 | services. | |
9290 | ||
9291 | Does not affect ICAP connections (e.g., does not turn Secure | |
9292 | ICAP on or off). | |
9293 | ||
4dd2c9d6 | 9294 | ==== ICAPS / TLS OPTIONS ==== |
1b091aec CT |
9295 | |
9296 | These options are used for Secure ICAP (icaps://....) services only. | |
9297 | ||
4dd2c9d6 | 9298 | tls-cert=/path/to/ssl/certificate |
51e09c08 AJ |
9299 | A client X.509 certificate to use when connecting to |
9300 | this ICAP server. | |
1b091aec | 9301 | |
4dd2c9d6 | 9302 | tls-key=/path/to/ssl/key |
51e09c08 AJ |
9303 | The private key corresponding to the previous |
9304 | tls-cert= option. | |
9305 | ||
9306 | If tls-key= is not specified tls-cert= is assumed to | |
9307 | reference a PEM file containing both the certificate | |
9308 | and private key. | |
1b091aec | 9309 | |
4dd2c9d6 | 9310 | tls-cipher=... The list of valid TLS/SSL ciphers to use when connecting |
1b091aec CT |
9311 | to this icap server. |
9312 | ||
1cc44095 AJ |
9313 | tls-min-version=1.N |
9314 | The minimum TLS protocol version to permit. To control | |
3f5b28fe | 9315 | SSLv3 use the tls-options= parameter. |
1cc44095 AJ |
9316 | Supported Values: 1.0 (default), 1.1, 1.2 |
9317 | ||
4dd2c9d6 | 9318 | tls-options=... Specify various OpenSSL library options: |
1b091aec CT |
9319 | |
9320 | NO_SSLv3 Disallow the use of SSLv3 | |
4dd2c9d6 | 9321 | |
1b091aec CT |
9322 | SINGLE_DH_USE |
9323 | Always create a new key when using | |
9324 | temporary/ephemeral DH key exchanges | |
4dd2c9d6 | 9325 | |
1b091aec | 9326 | ALL Enable various bug workarounds |
4dd2c9d6 AJ |
9327 | suggested as "harmless" by OpenSSL |
9328 | Be warned that this reduces SSL/TLS | |
9329 | strength to some attacks. | |
1b091aec CT |
9330 | |
9331 | See the OpenSSL SSL_CTX_set_options documentation for a | |
4dd2c9d6 AJ |
9332 | more complete list. Options relevant only to SSLv2 are |
9333 | not supported. | |
1b091aec | 9334 | |
86a84cc0 AJ |
9335 | tls-cafile= PEM file containing CA certificates to use when verifying |
9336 | the icap server certificate. | |
9337 | Use to specify intermediate CA certificate(s) if not sent | |
9338 | by the server. Or the full CA chain for the server when | |
435c72b0 | 9339 | using the tls-default-ca=off flag. |
86a84cc0 | 9340 | May be repeated to load multiple files. |
1b091aec | 9341 | |
4dd2c9d6 | 9342 | tls-capath=... A directory containing additional CA certificates to |
1b091aec | 9343 | use when verifying the icap server certificate. |
86a84cc0 | 9344 | Requires OpenSSL or LibreSSL. |
1b091aec | 9345 | |
4dd2c9d6 | 9346 | tls-crlfile=... A certificate revocation list file to use when |
1b091aec CT |
9347 | verifying the icap server certificate. |
9348 | ||
4dd2c9d6 | 9349 | tls-flags=... Specify various flags modifying the Squid TLS implementation: |
1b091aec CT |
9350 | |
9351 | DONT_VERIFY_PEER | |
9352 | Accept certificates even if they fail to | |
9353 | verify. | |
1b091aec CT |
9354 | DONT_VERIFY_DOMAIN |
9355 | Don't verify the icap server certificate | |
9356 | matches the server name | |
9357 | ||
435c72b0 AJ |
9358 | tls-default-ca[=off] |
9359 | Whether to use the system Trusted CAs. Default is ON. | |
8b253b83 | 9360 | |
4dd2c9d6 | 9361 | tls-domain= The icap server name as advertised in it's certificate. |
1b091aec CT |
9362 | Used for verifying the correctness of the received icap |
9363 | server certificate. If not specified the icap server | |
9364 | hostname extracted from ICAP URI will be used. | |
9365 | ||
a22e6cd3 AR |
9366 | Older icap_service format without optional named parameters is |
9367 | deprecated but supported for backward compatibility. | |
5473c134 | 9368 | |
5473c134 | 9369 | Example: |
c25c2836 | 9370 | icap_service svcBlocker reqmod_precache icap://icap1.mydomain.net:1344/reqmod bypass=0 |
1b091aec | 9371 | icap_service svcLogger reqmod_precache icaps://icap2.mydomain.net:11344/reqmod routing=on |
cccac0a2 | 9372 | DOC_END |
9373 | ||
5473c134 | 9374 | NAME: icap_class |
9375 | TYPE: icap_class_type | |
9376 | IFDEF: ICAP_CLIENT | |
21a26d31 | 9377 | LOC: none |
5473c134 | 9378 | DEFAULT: none |
cccac0a2 | 9379 | DOC_START |
a22e6cd3 | 9380 | This deprecated option was documented to define an ICAP service |
62c7f90e AR |
9381 | chain, even though it actually defined a set of similar, redundant |
9382 | services, and the chains were not supported. | |
5473c134 | 9383 | |
62c7f90e | 9384 | To define a set of redundant services, please use the |
a22e6cd3 AR |
9385 | adaptation_service_set directive. For service chains, use |
9386 | adaptation_service_chain. | |
cccac0a2 | 9387 | DOC_END |
9388 | ||
5473c134 | 9389 | NAME: icap_access |
9390 | TYPE: icap_access_type | |
9391 | IFDEF: ICAP_CLIENT | |
21a26d31 | 9392 | LOC: none |
cccac0a2 | 9393 | DEFAULT: none |
cccac0a2 | 9394 | DOC_START |
a22e6cd3 | 9395 | This option is deprecated. Please use adaptation_access, which |
62c7f90e AR |
9396 | has the same ICAP functionality, but comes with better |
9397 | documentation, and eCAP support. | |
cccac0a2 | 9398 | DOC_END |
9399 | ||
57afc994 AR |
9400 | COMMENT_START |
9401 | eCAP OPTIONS | |
9402 | ----------------------------------------------------------------------------- | |
9403 | COMMENT_END | |
9404 | ||
21a26d31 AR |
9405 | NAME: ecap_enable |
9406 | TYPE: onoff | |
9407 | IFDEF: USE_ECAP | |
9408 | COMMENT: on|off | |
574b508c | 9409 | LOC: Adaptation::Ecap::TheConfig.onoff |
21a26d31 AR |
9410 | DEFAULT: off |
9411 | DOC_START | |
9412 | Controls whether eCAP support is enabled. | |
9413 | DOC_END | |
9414 | ||
9415 | NAME: ecap_service | |
9416 | TYPE: ecap_service_type | |
9417 | IFDEF: USE_ECAP | |
574b508c | 9418 | LOC: Adaptation::Ecap::TheConfig |
21a26d31 AR |
9419 | DEFAULT: none |
9420 | DOC_START | |
9421 | Defines a single eCAP service | |
9422 | ||
c25c2836 | 9423 | ecap_service id vectoring_point uri [option ...] |
21a26d31 | 9424 | |
c25c2836 CT |
9425 | id: ID |
9426 | an opaque identifier or name which is used to direct traffic to | |
9427 | this specific service. Must be unique among all adaptation | |
9428 | services in squid.conf. | |
9429 | ||
9430 | vectoring_point: reqmod_precache|reqmod_postcache|respmod_precache|respmod_postcache | |
21a26d31 AR |
9431 | This specifies at which point of transaction processing the |
9432 | eCAP service should be activated. *_postcache vectoring points | |
9433 | are not yet supported. | |
c25c2836 CT |
9434 | |
9435 | uri: ecap://vendor/service_name?custom&cgi=style¶meters=optional | |
9436 | Squid uses the eCAP service URI to match this configuration | |
9437 | line with one of the dynamically loaded services. Each loaded | |
9438 | eCAP service must have a unique URI. Obtain the right URI from | |
9439 | the service provider. | |
9440 | ||
3caa16d2 AR |
9441 | To activate a service, use the adaptation_access directive. To group |
9442 | services, use adaptation_service_chain and adaptation_service_set. | |
c25c2836 CT |
9443 | |
9444 | Service options are separated by white space. eCAP services support | |
9445 | the following name=value options: | |
9446 | ||
9447 | bypass=on|off|1|0 | |
9448 | If set to 'on' or '1', the eCAP service is treated as optional. | |
9449 | If the service cannot be reached or malfunctions, Squid will try | |
9450 | to ignore any errors and process the message as if the service | |
21a26d31 | 9451 | was not enabled. No all eCAP errors can be bypassed. |
c25c2836 CT |
9452 | If set to 'off' or '0', the eCAP service is treated as essential |
9453 | and all eCAP errors will result in an error page returned to the | |
21a26d31 | 9454 | HTTP client. |
c25c2836 CT |
9455 | |
9456 | Bypass is off by default: services are treated as essential. | |
9457 | ||
9458 | routing=on|off|1|0 | |
9459 | If set to 'on' or '1', the eCAP service is allowed to | |
9460 | dynamically change the current message adaptation plan by | |
9461 | returning a chain of services to be used next. | |
9462 | ||
9463 | Dynamic adaptation plan may cross or cover multiple supported | |
9464 | vectoring points in their natural processing order. | |
9465 | ||
9466 | Routing is not allowed by default. | |
9467 | ||
88df846b CT |
9468 | connection-encryption=on|off |
9469 | Determines the eCAP service effect on the connections_encrypted | |
9470 | ACL. | |
9471 | ||
9472 | Defaults to "on", which does not taint the master transaction | |
9473 | w.r.t. that ACL. | |
9474 | ||
9475 | Does not affect eCAP API calls. | |
9476 | ||
c25c2836 CT |
9477 | Older ecap_service format without optional named parameters is |
9478 | deprecated but supported for backward compatibility. | |
9479 | ||
21a26d31 AR |
9480 | |
9481 | Example: | |
c25c2836 CT |
9482 | ecap_service s1 reqmod_precache ecap://filters.R.us/leakDetector?on_error=block bypass=off |
9483 | ecap_service s2 respmod_precache ecap://filters.R.us/virusFilter config=/etc/vf.cfg bypass=on | |
21a26d31 AR |
9484 | DOC_END |
9485 | ||
57afc994 AR |
9486 | NAME: loadable_modules |
9487 | TYPE: wordlist | |
9488 | IFDEF: USE_LOADABLE_MODULES | |
9489 | LOC: Config.loadable_module_names | |
9490 | DEFAULT: none | |
9491 | DOC_START | |
9492 | Instructs Squid to load the specified dynamic module(s) or activate | |
9493 | preloaded module(s). | |
9494 | Example: | |
9495 | loadable_modules @DEFAULT_PREFIX@/lib/MinimalAdapter.so | |
9496 | DOC_END | |
9497 | ||
62c7f90e AR |
9498 | COMMENT_START |
9499 | MESSAGE ADAPTATION OPTIONS | |
9500 | ----------------------------------------------------------------------------- | |
9501 | COMMENT_END | |
9502 | ||
9503 | NAME: adaptation_service_set | |
9504 | TYPE: adaptation_service_set_type | |
9505 | IFDEF: USE_ADAPTATION | |
9506 | LOC: none | |
9507 | DEFAULT: none | |
9508 | DOC_START | |
9509 | ||
a22e6cd3 AR |
9510 | Configures an ordered set of similar, redundant services. This is |
9511 | useful when hot standby or backup adaptation servers are available. | |
9512 | ||
9513 | adaptation_service_set set_name service_name1 service_name2 ... | |
9514 | ||
9515 | The named services are used in the set declaration order. The first | |
9516 | applicable adaptation service from the set is used first. The next | |
9517 | applicable service is tried if and only if the transaction with the | |
9518 | previous service fails and the message waiting to be adapted is still | |
9519 | intact. | |
62c7f90e | 9520 | |
a22e6cd3 AR |
9521 | When adaptation starts, broken services are ignored as if they were |
9522 | not a part of the set. A broken service is a down optional service. | |
62c7f90e | 9523 | |
a22e6cd3 AR |
9524 | The services in a set must be attached to the same vectoring point |
9525 | (e.g., pre-cache) and use the same adaptation method (e.g., REQMOD). | |
9526 | ||
9527 | If all services in a set are optional then adaptation failures are | |
9528 | bypassable. If all services in the set are essential, then a | |
9529 | transaction failure with one service may still be retried using | |
9530 | another service from the set, but when all services fail, the master | |
9531 | transaction fails as well. | |
9532 | ||
9533 | A set may contain a mix of optional and essential services, but that | |
9534 | is likely to lead to surprising results because broken services become | |
9535 | ignored (see above), making previously bypassable failures fatal. | |
9536 | Technically, it is the bypassability of the last failed service that | |
9537 | matters. | |
9538 | ||
9539 | See also: adaptation_access adaptation_service_chain | |
62c7f90e AR |
9540 | |
9541 | Example: | |
9542 | adaptation_service_set svcBlocker urlFilterPrimary urlFilterBackup | |
9543 | adaptation service_set svcLogger loggerLocal loggerRemote | |
9544 | DOC_END | |
9545 | ||
a22e6cd3 AR |
9546 | NAME: adaptation_service_chain |
9547 | TYPE: adaptation_service_chain_type | |
9548 | IFDEF: USE_ADAPTATION | |
9549 | LOC: none | |
9550 | DEFAULT: none | |
9551 | DOC_START | |
9552 | ||
9553 | Configures a list of complementary services that will be applied | |
9554 | one-by-one, forming an adaptation chain or pipeline. This is useful | |
9555 | when Squid must perform different adaptations on the same message. | |
9556 | ||
9557 | adaptation_service_chain chain_name service_name1 svc_name2 ... | |
9558 | ||
9559 | The named services are used in the chain declaration order. The first | |
9560 | applicable adaptation service from the chain is used first. The next | |
9561 | applicable service is applied to the successful adaptation results of | |
9562 | the previous service in the chain. | |
9563 | ||
9564 | When adaptation starts, broken services are ignored as if they were | |
9565 | not a part of the chain. A broken service is a down optional service. | |
9566 | ||
9567 | Request satisfaction terminates the adaptation chain because Squid | |
9568 | does not currently allow declaration of RESPMOD services at the | |
9569 | "reqmod_precache" vectoring point (see icap_service or ecap_service). | |
9570 | ||
9571 | The services in a chain must be attached to the same vectoring point | |
9572 | (e.g., pre-cache) and use the same adaptation method (e.g., REQMOD). | |
9573 | ||
9574 | A chain may contain a mix of optional and essential services. If an | |
9575 | essential adaptation fails (or the failure cannot be bypassed for | |
9576 | other reasons), the master transaction fails. Otherwise, the failure | |
9577 | is bypassed as if the failed adaptation service was not in the chain. | |
9578 | ||
9579 | See also: adaptation_access adaptation_service_set | |
9580 | ||
9581 | Example: | |
9582 | adaptation_service_chain svcRequest requestLogger urlFilter leakDetector | |
9583 | DOC_END | |
9584 | ||
62c7f90e AR |
9585 | NAME: adaptation_access |
9586 | TYPE: adaptation_access_type | |
9587 | IFDEF: USE_ADAPTATION | |
9588 | LOC: none | |
9589 | DEFAULT: none | |
638402dd | 9590 | DEFAULT_DOC: Allow, unless rules exist in squid.conf. |
62c7f90e AR |
9591 | DOC_START |
9592 | Sends an HTTP transaction to an ICAP or eCAP adaptation service. | |
9593 | ||
9594 | adaptation_access service_name allow|deny [!]aclname... | |
9595 | adaptation_access set_name allow|deny [!]aclname... | |
9596 | ||
9597 | At each supported vectoring point, the adaptation_access | |
9598 | statements are processed in the order they appear in this | |
9599 | configuration file. Statements pointing to the following services | |
9600 | are ignored (i.e., skipped without checking their ACL): | |
9601 | ||
9602 | - services serving different vectoring points | |
9603 | - "broken-but-bypassable" services | |
9604 | - "up" services configured to ignore such transactions | |
9605 | (e.g., based on the ICAP Transfer-Ignore header). | |
9606 | ||
9607 | When a set_name is used, all services in the set are checked | |
9608 | using the same rules, to find the first applicable one. See | |
9609 | adaptation_service_set for details. | |
9610 | ||
9611 | If an access list is checked and there is a match, the | |
9612 | processing stops: For an "allow" rule, the corresponding | |
9613 | adaptation service is used for the transaction. For a "deny" | |
9614 | rule, no adaptation service is activated. | |
9615 | ||
9616 | It is currently not possible to apply more than one adaptation | |
9617 | service at the same vectoring point to the same HTTP transaction. | |
9618 | ||
9619 | See also: icap_service and ecap_service | |
9620 | ||
9621 | Example: | |
9622 | adaptation_access service_1 allow all | |
9623 | DOC_END | |
9624 | ||
a22e6cd3 AR |
9625 | NAME: adaptation_service_iteration_limit |
9626 | TYPE: int | |
9627 | IFDEF: USE_ADAPTATION | |
9628 | LOC: Adaptation::Config::service_iteration_limit | |
9629 | DEFAULT: 16 | |
9630 | DOC_START | |
9631 | Limits the number of iterations allowed when applying adaptation | |
9632 | services to a message. If your longest adaptation set or chain | |
9633 | may have more than 16 services, increase the limit beyond its | |
9634 | default value of 16. If detecting infinite iteration loops sooner | |
9635 | is critical, make the iteration limit match the actual number | |
9636 | of services in your longest adaptation set or chain. | |
9637 | ||
9638 | Infinite adaptation loops are most likely with routing services. | |
9639 | ||
9640 | See also: icap_service routing=1 | |
9641 | DOC_END | |
9642 | ||
3ff65596 AR |
9643 | NAME: adaptation_masterx_shared_names |
9644 | TYPE: string | |
9645 | IFDEF: USE_ADAPTATION | |
9646 | LOC: Adaptation::Config::masterx_shared_name | |
9647 | DEFAULT: none | |
9648 | DOC_START | |
9649 | For each master transaction (i.e., the HTTP request and response | |
9650 | sequence, including all related ICAP and eCAP exchanges), Squid | |
9651 | maintains a table of metadata. The table entries are (name, value) | |
9652 | pairs shared among eCAP and ICAP exchanges. The table is destroyed | |
9653 | with the master transaction. | |
9654 | ||
9655 | This option specifies the table entry names that Squid must accept | |
9656 | from and forward to the adaptation transactions. | |
9657 | ||
9658 | An ICAP REQMOD or RESPMOD transaction may set an entry in the | |
9659 | shared table by returning an ICAP header field with a name | |
6666da11 AR |
9660 | specified in adaptation_masterx_shared_names. |
9661 | ||
9662 | An eCAP REQMOD or RESPMOD transaction may set an entry in the | |
9663 | shared table by implementing the libecap::visitEachOption() API | |
9664 | to provide an option with a name specified in | |
9665 | adaptation_masterx_shared_names. | |
5038f9d8 AR |
9666 | |
9667 | Squid will store and forward the set entry to subsequent adaptation | |
3ff65596 AR |
9668 | transactions within the same master transaction scope. |
9669 | ||
9670 | Only one shared entry name is supported at this time. | |
9671 | ||
9672 | Example: | |
9673 | # share authentication information among ICAP services | |
9674 | adaptation_masterx_shared_names X-Subscriber-ID | |
9675 | DOC_END | |
9676 | ||
71be37e0 | 9677 | NAME: adaptation_meta |
d7f4a0b7 | 9678 | TYPE: note |
71be37e0 CT |
9679 | IFDEF: USE_ADAPTATION |
9680 | LOC: Adaptation::Config::metaHeaders | |
9681 | DEFAULT: none | |
9682 | DOC_START | |
9683 | This option allows Squid administrator to add custom ICAP request | |
9684 | headers or eCAP options to Squid ICAP requests or eCAP transactions. | |
9685 | Use it to pass custom authentication tokens and other | |
9686 | transaction-state related meta information to an ICAP/eCAP service. | |
9687 | ||
9688 | The addition of a meta header is ACL-driven: | |
9689 | adaptation_meta name value [!]aclname ... | |
9690 | ||
9691 | Processing for a given header name stops after the first ACL list match. | |
9692 | Thus, it is impossible to add two headers with the same name. If no ACL | |
9693 | lists match for a given header name, no such header is added. For | |
9694 | example: | |
9695 | ||
9696 | # do not debug transactions except for those that need debugging | |
9697 | adaptation_meta X-Debug 1 needs_debugging | |
9698 | ||
9699 | # log all transactions except for those that must remain secret | |
9700 | adaptation_meta X-Log 1 !keep_secret | |
9701 | ||
9702 | # mark transactions from users in the "G 1" group | |
9703 | adaptation_meta X-Authenticated-Groups "G 1" authed_as_G1 | |
9704 | ||
9705 | The "value" parameter may be a regular squid.conf token or a "double | |
9706 | quoted string". Within the quoted string, use backslash (\) to escape | |
9707 | any character, which is currently only useful for escaping backslashes | |
9708 | and double quotes. For example, | |
9709 | "this string has one backslash (\\) and two \"quotes\"" | |
d7f4a0b7 CT |
9710 | |
9711 | Used adaptation_meta header values may be logged via %note | |
9712 | logformat code. If multiple adaptation_meta headers with the same name | |
9713 | are used during master transaction lifetime, the header values are | |
9714 | logged in the order they were used and duplicate values are ignored | |
9715 | (only the first repeated value will be logged). | |
71be37e0 CT |
9716 | DOC_END |
9717 | ||
3ff65596 AR |
9718 | NAME: icap_retry |
9719 | TYPE: acl_access | |
9720 | IFDEF: ICAP_CLIENT | |
9721 | LOC: Adaptation::Icap::TheConfig.repeat | |
3ff65596 AR |
9722 | DEFAULT_IF_NONE: deny all |
9723 | DOC_START | |
9724 | This ACL determines which retriable ICAP transactions are | |
9725 | retried. Transactions that received a complete ICAP response | |
9726 | and did not have to consume or produce HTTP bodies to receive | |
9727 | that response are usually retriable. | |
9728 | ||
9729 | icap_retry allow|deny [!]aclname ... | |
9730 | ||
9731 | Squid automatically retries some ICAP I/O timeouts and errors | |
9732 | due to persistent connection race conditions. | |
9733 | ||
9734 | See also: icap_retry_limit | |
9735 | DOC_END | |
9736 | ||
9737 | NAME: icap_retry_limit | |
9738 | TYPE: int | |
9739 | IFDEF: ICAP_CLIENT | |
9740 | LOC: Adaptation::Icap::TheConfig.repeat_limit | |
9741 | DEFAULT: 0 | |
638402dd | 9742 | DEFAULT_DOC: No retries are allowed. |
3ff65596 | 9743 | DOC_START |
638402dd | 9744 | Limits the number of retries allowed. |
3ff65596 AR |
9745 | |
9746 | Communication errors due to persistent connection race | |
9747 | conditions are unavoidable, automatically retried, and do not | |
9748 | count against this limit. | |
9749 | ||
9750 | See also: icap_retry | |
9751 | DOC_END | |
9752 | ||
9753 | ||
5473c134 | 9754 | COMMENT_START |
9755 | DNS OPTIONS | |
9756 | ----------------------------------------------------------------------------- | |
9757 | COMMENT_END | |
9758 | ||
9759 | NAME: check_hostnames | |
cccac0a2 | 9760 | TYPE: onoff |
cccac0a2 | 9761 | DEFAULT: off |
5473c134 | 9762 | LOC: Config.onoff.check_hostnames |
cccac0a2 | 9763 | DOC_START |
5473c134 | 9764 | For security and stability reasons Squid can check |
9765 | hostnames for Internet standard RFC compliance. If you want | |
9766 | Squid to perform these checks turn this directive on. | |
cccac0a2 | 9767 | DOC_END |
9768 | ||
5473c134 | 9769 | NAME: allow_underscore |
cccac0a2 | 9770 | TYPE: onoff |
cccac0a2 | 9771 | DEFAULT: on |
5473c134 | 9772 | LOC: Config.onoff.allow_underscore |
cccac0a2 | 9773 | DOC_START |
5473c134 | 9774 | Underscore characters is not strictly allowed in Internet hostnames |
9775 | but nevertheless used by many sites. Set this to off if you want | |
9776 | Squid to be strict about the standard. | |
9777 | This check is performed only when check_hostnames is set to on. | |
cccac0a2 | 9778 | DOC_END |
9779 | ||
5473c134 | 9780 | NAME: dns_retransmit_interval |
fd0f51c4 | 9781 | TYPE: time_msec |
5473c134 | 9782 | DEFAULT: 5 seconds |
9783 | LOC: Config.Timeout.idns_retransmit | |
cccac0a2 | 9784 | DOC_START |
5473c134 | 9785 | Initial retransmit interval for DNS queries. The interval is |
9786 | doubled each time all configured DNS servers have been tried. | |
cccac0a2 | 9787 | DOC_END |
9788 | ||
5473c134 | 9789 | NAME: dns_timeout |
fd0f51c4 | 9790 | TYPE: time_msec |
a541c34e | 9791 | DEFAULT: 30 seconds |
5473c134 | 9792 | LOC: Config.Timeout.idns_query |
cccac0a2 | 9793 | DOC_START |
5473c134 | 9794 | DNS Query timeout. If no response is received to a DNS query |
9795 | within this time all DNS servers for the queried domain | |
9796 | are assumed to be unavailable. | |
cccac0a2 | 9797 | DOC_END |
9798 | ||
e210930b AJ |
9799 | NAME: dns_packet_max |
9800 | TYPE: b_ssize_t | |
638402dd | 9801 | DEFAULT_DOC: EDNS disabled |
e210930b AJ |
9802 | DEFAULT: none |
9803 | LOC: Config.dns.packet_max | |
e210930b AJ |
9804 | DOC_START |
9805 | Maximum number of bytes packet size to advertise via EDNS. | |
9806 | Set to "none" to disable EDNS large packet support. | |
9807 | ||
9808 | For legacy reasons DNS UDP replies will default to 512 bytes which | |
9809 | is too small for many responses. EDNS provides a means for Squid to | |
9810 | negotiate receiving larger responses back immediately without having | |
9811 | to failover with repeat requests. Responses larger than this limit | |
9812 | will retain the old behaviour of failover to TCP DNS. | |
9813 | ||
9814 | Squid has no real fixed limit internally, but allowing packet sizes | |
9815 | over 1500 bytes requires network jumbogram support and is usually not | |
9816 | necessary. | |
9817 | ||
9818 | WARNING: The RFC also indicates that some older resolvers will reply | |
9819 | with failure of the whole request if the extension is added. Some | |
9820 | resolvers have already been identified which will reply with mangled | |
9821 | EDNS response on occasion. Usually in response to many-KB jumbogram | |
9822 | sizes being advertised by Squid. | |
9823 | Squid will currently treat these both as an unable-to-resolve domain | |
9824 | even if it would be resolvable without EDNS. | |
9825 | DOC_END | |
9826 | ||
5473c134 | 9827 | NAME: dns_defnames |
9828 | COMMENT: on|off | |
cccac0a2 | 9829 | TYPE: onoff |
cccac0a2 | 9830 | DEFAULT: off |
638402dd | 9831 | DEFAULT_DOC: Search for single-label domain names is disabled. |
5473c134 | 9832 | LOC: Config.onoff.res_defnames |
cccac0a2 | 9833 | DOC_START |
5473c134 | 9834 | Normally the RES_DEFNAMES resolver option is disabled |
9835 | (see res_init(3)). This prevents caches in a hierarchy | |
9836 | from interpreting single-component hostnames locally. To allow | |
9837 | Squid to handle single-component names, enable this option. | |
cccac0a2 | 9838 | DOC_END |
9839 | ||
bce61b00 AJ |
9840 | NAME: dns_multicast_local |
9841 | COMMENT: on|off | |
9842 | TYPE: onoff | |
9843 | DEFAULT: off | |
9844 | DEFAULT_DOC: Search for .local and .arpa names is disabled. | |
9845 | LOC: Config.onoff.dns_mdns | |
9846 | DOC_START | |
9847 | When set to on, Squid sends multicast DNS lookups on the local | |
9848 | network for domains ending in .local and .arpa. | |
9849 | This enables local servers and devices to be contacted in an | |
9850 | ad-hoc or zero-configuration network environment. | |
9851 | DOC_END | |
9852 | ||
5473c134 | 9853 | NAME: dns_nameservers |
5a1098fb | 9854 | TYPE: SBufList |
5473c134 | 9855 | DEFAULT: none |
638402dd | 9856 | DEFAULT_DOC: Use operating system definitions |
5a1098fb | 9857 | LOC: Config.dns.nameservers |
cccac0a2 | 9858 | DOC_START |
5473c134 | 9859 | Use this if you want to specify a list of DNS name servers |
9860 | (IP addresses) to use instead of those given in your | |
9861 | /etc/resolv.conf file. | |
638402dd | 9862 | |
5473c134 | 9863 | On Windows platforms, if no value is specified here or in |
9864 | the /etc/resolv.conf file, the list of DNS name servers are | |
9865 | taken from the Windows registry, both static and dynamic DHCP | |
9866 | configurations are supported. | |
cccac0a2 | 9867 | |
5473c134 | 9868 | Example: dns_nameservers 10.0.0.1 192.172.0.4 |
cccac0a2 | 9869 | DOC_END |
9870 | ||
5473c134 | 9871 | NAME: hosts_file |
cccac0a2 | 9872 | TYPE: string |
5473c134 | 9873 | DEFAULT: @DEFAULT_HOSTS@ |
9874 | LOC: Config.etcHostsPath | |
cccac0a2 | 9875 | DOC_START |
5473c134 | 9876 | Location of the host-local IP name-address associations |
9877 | database. Most Operating Systems have such a file on different | |
9878 | default locations: | |
9879 | - Un*X & Linux: /etc/hosts | |
9880 | - Windows NT/2000: %SystemRoot%\system32\drivers\etc\hosts | |
9881 | (%SystemRoot% value install default is c:\winnt) | |
9882 | - Windows XP/2003: %SystemRoot%\system32\drivers\etc\hosts | |
9883 | (%SystemRoot% value install default is c:\windows) | |
9884 | - Windows 9x/Me: %windir%\hosts | |
9885 | (%windir% value is usually c:\windows) | |
9886 | - Cygwin: /etc/hosts | |
cccac0a2 | 9887 | |
5473c134 | 9888 | The file contains newline-separated definitions, in the |
9889 | form ip_address_in_dotted_form name [name ...] names are | |
9890 | whitespace-separated. Lines beginning with an hash (#) | |
9891 | character are comments. | |
cccac0a2 | 9892 | |
5473c134 | 9893 | The file is checked at startup and upon configuration. |
9894 | If set to 'none', it won't be checked. | |
9895 | If append_domain is used, that domain will be added to | |
9896 | domain-local (i.e. not containing any dot character) host | |
9897 | definitions. | |
cccac0a2 | 9898 | DOC_END |
9899 | ||
5473c134 | 9900 | NAME: append_domain |
9901 | TYPE: string | |
9902 | LOC: Config.appendDomain | |
9903 | DEFAULT: none | |
638402dd | 9904 | DEFAULT_DOC: Use operating system definitions |
6a2f3fcf | 9905 | DOC_START |
5473c134 | 9906 | Appends local domain name to hostnames without any dots in |
9907 | them. append_domain must begin with a period. | |
9908 | ||
9909 | Be warned there are now Internet names with no dots in | |
9910 | them using only top-domain names, so setting this may | |
9911 | cause some Internet sites to become unavailable. | |
9912 | ||
9913 | Example: | |
9914 | append_domain .yourdomain.com | |
6a2f3fcf | 9915 | DOC_END |
9916 | ||
5473c134 | 9917 | NAME: ignore_unknown_nameservers |
9918 | TYPE: onoff | |
9919 | LOC: Config.onoff.ignore_unknown_nameservers | |
df6fd596 | 9920 | DEFAULT: on |
9921 | DOC_START | |
5473c134 | 9922 | By default Squid checks that DNS responses are received |
9923 | from the same IP addresses they are sent to. If they | |
9924 | don't match, Squid ignores the response and writes a warning | |
9925 | message to cache.log. You can allow responses from unknown | |
9926 | nameservers by setting this option to 'off'. | |
df6fd596 | 9927 | DOC_END |
9928 | ||
5a0da9ec AJ |
9929 | NAME: dns_v4_first |
9930 | TYPE: onoff | |
9931 | DEFAULT: off | |
9932 | LOC: Config.dns.v4_first | |
5a0da9ec AJ |
9933 | DOC_START |
9934 | With the IPv6 Internet being as fast or faster than IPv4 Internet | |
9935 | for most networks Squid prefers to contact websites over IPv6. | |
9936 | ||
9937 | This option reverses the order of preference to make Squid contact | |
9938 | dual-stack websites over IPv4 first. Squid will still perform both | |
9939 | IPv6 and IPv4 DNS lookups before connecting. | |
9940 | ||
9941 | WARNING: | |
9942 | This option will restrict the situations under which IPv6 | |
9943 | connectivity is used (and tested). Hiding network problems | |
9944 | which would otherwise be detected and warned about. | |
9945 | DOC_END | |
9946 | ||
6bc15a4f | 9947 | NAME: ipcache_size |
9948 | COMMENT: (number of entries) | |
9949 | TYPE: int | |
9950 | DEFAULT: 1024 | |
9951 | LOC: Config.ipcache.size | |
638402dd AJ |
9952 | DOC_START |
9953 | Maximum number of DNS IP cache entries. | |
9954 | DOC_END | |
6bc15a4f | 9955 | |
9956 | NAME: ipcache_low | |
9957 | COMMENT: (percent) | |
9958 | TYPE: int | |
9959 | DEFAULT: 90 | |
9960 | LOC: Config.ipcache.low | |
9961 | DOC_NONE | |
9962 | ||
9963 | NAME: ipcache_high | |
9964 | COMMENT: (percent) | |
9965 | TYPE: int | |
9966 | DEFAULT: 95 | |
9967 | LOC: Config.ipcache.high | |
9968 | DOC_START | |
9969 | The size, low-, and high-water marks for the IP cache. | |
9970 | DOC_END | |
9971 | ||
9972 | NAME: fqdncache_size | |
9973 | COMMENT: (number of entries) | |
9974 | TYPE: int | |
9975 | DEFAULT: 1024 | |
9976 | LOC: Config.fqdncache.size | |
9977 | DOC_START | |
9978 | Maximum number of FQDN cache entries. | |
9979 | DOC_END | |
9980 | ||
a58ff010 | 9981 | COMMENT_START |
5473c134 | 9982 | MISCELLANEOUS |
a58ff010 | 9983 | ----------------------------------------------------------------------------- |
9984 | COMMENT_END | |
9985 | ||
2eceb328 CT |
9986 | NAME: configuration_includes_quoted_values |
9987 | COMMENT: on|off | |
bde7a8ce CT |
9988 | TYPE: configuration_includes_quoted_values |
9989 | DEFAULT: off | |
2eceb328 CT |
9990 | LOC: ConfigParser::RecognizeQuotedValues |
9991 | DOC_START | |
9992 | If set, Squid will recognize each "quoted string" after a configuration | |
9993 | directive as a single parameter. The quotes are stripped before the | |
9994 | parameter value is interpreted or used. | |
9995 | See "Values with spaces, quotes, and other special characters" | |
9996 | section for more details. | |
9997 | DOC_END | |
9998 | ||
5473c134 | 9999 | NAME: memory_pools |
a58ff010 | 10000 | COMMENT: on|off |
5473c134 | 10001 | TYPE: onoff |
10002 | DEFAULT: on | |
10003 | LOC: Config.onoff.mem_pools | |
a58ff010 | 10004 | DOC_START |
5473c134 | 10005 | If set, Squid will keep pools of allocated (but unused) memory |
10006 | available for future use. If memory is a premium on your | |
10007 | system and you believe your malloc library outperforms Squid | |
10008 | routines, disable this. | |
a58ff010 | 10009 | DOC_END |
10010 | ||
5473c134 | 10011 | NAME: memory_pools_limit |
10012 | COMMENT: (bytes) | |
70be1349 | 10013 | TYPE: b_int64_t |
5473c134 | 10014 | DEFAULT: 5 MB |
10015 | LOC: Config.MemPools.limit | |
ec1245f8 | 10016 | DOC_START |
5473c134 | 10017 | Used only with memory_pools on: |
10018 | memory_pools_limit 50 MB | |
ec1245f8 | 10019 | |
5473c134 | 10020 | If set to a non-zero value, Squid will keep at most the specified |
10021 | limit of allocated (but unused) memory in memory pools. All free() | |
10022 | requests that exceed this limit will be handled by your malloc | |
10023 | library. Squid does not pre-allocate any memory, just safe-keeps | |
10024 | objects that otherwise would be free()d. Thus, it is safe to set | |
10025 | memory_pools_limit to a reasonably high value even if your | |
10026 | configuration will use less memory. | |
ec1245f8 | 10027 | |
89646bd7 | 10028 | If set to none, Squid will keep all memory it can. That is, there |
5473c134 | 10029 | will be no limit on the total amount of memory used for safe-keeping. |
ec1245f8 | 10030 | |
5473c134 | 10031 | To disable memory allocation optimization, do not set |
70be1349 | 10032 | memory_pools_limit to 0 or none. Set memory_pools to "off" instead. |
5473c134 | 10033 | |
10034 | An overhead for maintaining memory pools is not taken into account | |
10035 | when the limit is checked. This overhead is close to four bytes per | |
10036 | object kept. However, pools may actually _save_ memory because of | |
10037 | reduced memory thrashing in your malloc library. | |
ec1245f8 | 10038 | DOC_END |
10039 | ||
5473c134 | 10040 | NAME: forwarded_for |
67c06f0d AJ |
10041 | COMMENT: on|off|transparent|truncate|delete |
10042 | TYPE: string | |
5473c134 | 10043 | DEFAULT: on |
10044 | LOC: opt_forwarded_for | |
5f8252d2 | 10045 | DOC_START |
67c06f0d AJ |
10046 | If set to "on", Squid will append your client's IP address |
10047 | in the HTTP requests it forwards. By default it looks like: | |
5f8252d2 | 10048 | |
5473c134 | 10049 | X-Forwarded-For: 192.1.2.3 |
10050 | ||
67c06f0d | 10051 | If set to "off", it will appear as |
5473c134 | 10052 | |
10053 | X-Forwarded-For: unknown | |
67c06f0d AJ |
10054 | |
10055 | If set to "transparent", Squid will not alter the | |
10056 | X-Forwarded-For header in any way. | |
10057 | ||
10058 | If set to "delete", Squid will delete the entire | |
10059 | X-Forwarded-For header. | |
10060 | ||
10061 | If set to "truncate", Squid will remove all existing | |
dd68402f | 10062 | X-Forwarded-For entries, and place the client IP as the sole entry. |
5f8252d2 | 10063 | DOC_END |
10064 | ||
5473c134 | 10065 | NAME: cachemgr_passwd |
10066 | TYPE: cachemgrpasswd | |
10067 | DEFAULT: none | |
638402dd | 10068 | DEFAULT_DOC: No password. Actions which require password are denied. |
5473c134 | 10069 | LOC: Config.passwd_list |
5f8252d2 | 10070 | DOC_START |
5473c134 | 10071 | Specify passwords for cachemgr operations. |
5f8252d2 | 10072 | |
5473c134 | 10073 | Usage: cachemgr_passwd password action action ... |
10074 | ||
10075 | Some valid actions are (see cache manager menu for a full list): | |
10076 | 5min | |
10077 | 60min | |
10078 | asndb | |
10079 | authenticator | |
10080 | cbdata | |
10081 | client_list | |
10082 | comm_incoming | |
10083 | config * | |
10084 | counters | |
10085 | delay | |
10086 | digest_stats | |
10087 | dns | |
10088 | events | |
10089 | filedescriptors | |
10090 | fqdncache | |
10091 | histograms | |
10092 | http_headers | |
10093 | info | |
10094 | io | |
10095 | ipcache | |
10096 | mem | |
10097 | menu | |
10098 | netdb | |
10099 | non_peers | |
10100 | objects | |
10101 | offline_toggle * | |
10102 | pconn | |
10103 | peer_select | |
b360c477 | 10104 | reconfigure * |
5473c134 | 10105 | redirector |
10106 | refresh | |
10107 | server_list | |
10108 | shutdown * | |
10109 | store_digest | |
10110 | storedir | |
10111 | utilization | |
10112 | via_headers | |
10113 | vm_objects | |
10114 | ||
10115 | * Indicates actions which will not be performed without a | |
10116 | valid password, others can be performed if not listed here. | |
10117 | ||
10118 | To disable an action, set the password to "disable". | |
10119 | To allow performing an action without a password, set the | |
10120 | password to "none". | |
10121 | ||
10122 | Use the keyword "all" to set the same password for all actions. | |
10123 | ||
10124 | Example: | |
10125 | cachemgr_passwd secret shutdown | |
10126 | cachemgr_passwd lesssssssecret info stats/objects | |
10127 | cachemgr_passwd disable all | |
5f8252d2 | 10128 | DOC_END |
10129 | ||
5473c134 | 10130 | NAME: client_db |
a58ff010 | 10131 | COMMENT: on|off |
5473c134 | 10132 | TYPE: onoff |
10133 | DEFAULT: on | |
10134 | LOC: Config.onoff.client_db | |
a58ff010 | 10135 | DOC_START |
5473c134 | 10136 | If you want to disable collecting per-client statistics, |
10137 | turn off client_db here. | |
a58ff010 | 10138 | DOC_END |
10139 | ||
5473c134 | 10140 | NAME: refresh_all_ims |
10141 | COMMENT: on|off | |
10142 | TYPE: onoff | |
10143 | DEFAULT: off | |
10144 | LOC: Config.onoff.refresh_all_ims | |
a58ff010 | 10145 | DOC_START |
5473c134 | 10146 | When you enable this option, squid will always check |
10147 | the origin server for an update when a client sends an | |
10148 | If-Modified-Since request. Many browsers use IMS | |
10149 | requests when the user requests a reload, and this | |
10150 | ensures those clients receive the latest version. | |
a58ff010 | 10151 | |
5473c134 | 10152 | By default (off), squid may return a Not Modified response |
10153 | based on the age of the cached version. | |
78e8cfc4 | 10154 | DOC_END |
10155 | ||
5473c134 | 10156 | NAME: reload_into_ims |
626096be | 10157 | IFDEF: USE_HTTP_VIOLATIONS |
12b91c99 | 10158 | COMMENT: on|off |
5473c134 | 10159 | TYPE: onoff |
10160 | DEFAULT: off | |
10161 | LOC: Config.onoff.reload_into_ims | |
12b91c99 | 10162 | DOC_START |
5473c134 | 10163 | When you enable this option, client no-cache or ``reload'' |
10164 | requests will be changed to If-Modified-Since requests. | |
10165 | Doing this VIOLATES the HTTP standard. Enabling this | |
10166 | feature could make you liable for problems which it | |
10167 | causes. | |
10168 | ||
10169 | see also refresh_pattern for a more selective approach. | |
12b91c99 | 10170 | DOC_END |
10171 | ||
31ef19cd | 10172 | NAME: connect_retries |
5473c134 | 10173 | TYPE: int |
31ef19cd AJ |
10174 | LOC: Config.connect_retries |
10175 | DEFAULT: 0 | |
638402dd | 10176 | DEFAULT_DOC: Do not retry failed connections. |
a58ff010 | 10177 | DOC_START |
3eebd267 EB |
10178 | Limits the number of reopening attempts when establishing a single |
10179 | TCP connection. All these attempts must still complete before the | |
10180 | applicable connection opening timeout expires. | |
10181 | ||
10182 | By default and when connect_retries is set to zero, Squid does not | |
10183 | retry failed connection opening attempts. | |
31ef19cd | 10184 | |
3eebd267 EB |
10185 | The (not recommended) maximum is 10 tries. An attempt to configure a |
10186 | higher value results in the value of 10 being used (with a warning). | |
5473c134 | 10187 | |
3eebd267 EB |
10188 | Squid may open connections to retry various high-level forwarding |
10189 | failures. For an outside observer, that activity may look like a | |
10190 | low-level connection reopening attempt, but those high-level retries | |
10191 | are governed by forward_max_tries instead. | |
5473c134 | 10192 | |
3eebd267 EB |
10193 | See also: connect_timeout, forward_timeout, icap_connect_timeout, |
10194 | ident_timeout, and forward_max_tries. | |
a58ff010 | 10195 | DOC_END |
10196 | ||
5473c134 | 10197 | NAME: retry_on_error |
a58ff010 | 10198 | TYPE: onoff |
5473c134 | 10199 | LOC: Config.retry.onerror |
a58ff010 | 10200 | DEFAULT: off |
10201 | DOC_START | |
aea8548b AJ |
10202 | If set to ON Squid will automatically retry requests when |
10203 | receiving an error response with status 403 (Forbidden), | |
10204 | 500 (Internal Error), 501 or 503 (Service not available). | |
10205 | Status 502 and 504 (Gateway errors) are always retried. | |
10206 | ||
10207 | This is mainly useful if you are in a complex cache hierarchy to | |
10208 | work around access control errors. | |
10209 | ||
10210 | NOTE: This retry will attempt to find another working destination. | |
10211 | Which is different from the server which just failed. | |
5f8252d2 | 10212 | DOC_END |
10213 | ||
5473c134 | 10214 | NAME: as_whois_server |
5f8252d2 | 10215 | TYPE: string |
5473c134 | 10216 | LOC: Config.as_whois_server |
10217 | DEFAULT: whois.ra.net | |
5f8252d2 | 10218 | DOC_START |
5473c134 | 10219 | WHOIS server to query for AS numbers. NOTE: AS numbers are |
10220 | queried only when Squid starts up, not for every request. | |
5f8252d2 | 10221 | DOC_END |
10222 | ||
5473c134 | 10223 | NAME: offline_mode |
5f8252d2 | 10224 | TYPE: onoff |
5473c134 | 10225 | LOC: Config.onoff.offline |
5f8252d2 | 10226 | DEFAULT: off |
10227 | DOC_START | |
5473c134 | 10228 | Enable this option and Squid will never try to validate cached |
10229 | objects. | |
a58ff010 | 10230 | DOC_END |
10231 | ||
5473c134 | 10232 | NAME: uri_whitespace |
10233 | TYPE: uri_whitespace | |
10234 | LOC: Config.uri_whitespace | |
10235 | DEFAULT: strip | |
a58ff010 | 10236 | DOC_START |
5473c134 | 10237 | What to do with requests that have whitespace characters in the |
10238 | URI. Options: | |
a58ff010 | 10239 | |
5473c134 | 10240 | strip: The whitespace characters are stripped out of the URL. |
82806837 AJ |
10241 | This is the behavior recommended by RFC2396 and RFC3986 |
10242 | for tolerant handling of generic URI. | |
10243 | NOTE: This is one difference between generic URI and HTTP URLs. | |
10244 | ||
5473c134 | 10245 | deny: The request is denied. The user receives an "Invalid |
10246 | Request" message. | |
82806837 AJ |
10247 | This is the behaviour recommended by RFC2616 for safe |
10248 | handling of HTTP request URL. | |
10249 | ||
5473c134 | 10250 | allow: The request is allowed and the URI is not changed. The |
10251 | whitespace characters remain in the URI. Note the | |
10252 | whitespace is passed to redirector processes if they | |
10253 | are in use. | |
82806837 AJ |
10254 | Note this may be considered a violation of RFC2616 |
10255 | request parsing where whitespace is prohibited in the | |
10256 | URL field. | |
10257 | ||
5473c134 | 10258 | encode: The request is allowed and the whitespace characters are |
82806837 AJ |
10259 | encoded according to RFC1738. |
10260 | ||
5473c134 | 10261 | chop: The request is allowed and the URI is chopped at the |
82806837 AJ |
10262 | first whitespace. |
10263 | ||
10264 | ||
10265 | NOTE the current Squid implementation of encode and chop violates | |
10266 | RFC2616 by not using a 301 redirect after altering the URL. | |
5473c134 | 10267 | DOC_END |
a58ff010 | 10268 | |
5473c134 | 10269 | NAME: chroot |
10270 | TYPE: string | |
10271 | LOC: Config.chroot_dir | |
a58ff010 | 10272 | DEFAULT: none |
10273 | DOC_START | |
9f37c18a | 10274 | Specifies a directory where Squid should do a chroot() while |
2d89f399 HN |
10275 | initializing. This also causes Squid to fully drop root |
10276 | privileges after initializing. This means, for example, if you | |
10277 | use a HTTP port less than 1024 and try to reconfigure, you may | |
10278 | get an error saying that Squid can not open the port. | |
5473c134 | 10279 | DOC_END |
a58ff010 | 10280 | |
5473c134 | 10281 | NAME: pipeline_prefetch |
079a8480 AJ |
10282 | TYPE: pipelinePrefetch |
10283 | LOC: Config.pipeline_max_prefetch | |
10284 | DEFAULT: 0 | |
10285 | DEFAULT_DOC: Do not pre-parse pipelined requests. | |
a58ff010 | 10286 | DOC_START |
079a8480 AJ |
10287 | HTTP clients may send a pipeline of 1+N requests to Squid using a |
10288 | single connection, without waiting for Squid to respond to the first | |
10289 | of those requests. This option limits the number of concurrent | |
10290 | requests Squid will try to handle in parallel. If set to N, Squid | |
10291 | will try to receive and process up to 1+N requests on the same | |
10292 | connection concurrently. | |
a58ff010 | 10293 | |
079a8480 | 10294 | Defaults to 0 (off) for bandwidth management and access logging |
5473c134 | 10295 | reasons. |
a0e23afd | 10296 | |
079a8480 AJ |
10297 | NOTE: pipelining requires persistent connections to clients. |
10298 | ||
a0e23afd | 10299 | WARNING: pipelining breaks NTLM and Negotiate/Kerberos authentication. |
5473c134 | 10300 | DOC_END |
a58ff010 | 10301 | |
5473c134 | 10302 | NAME: high_response_time_warning |
10303 | TYPE: int | |
10304 | COMMENT: (msec) | |
10305 | LOC: Config.warnings.high_rptm | |
10306 | DEFAULT: 0 | |
638402dd | 10307 | DEFAULT_DOC: disabled. |
5473c134 | 10308 | DOC_START |
10309 | If the one-minute median response time exceeds this value, | |
10310 | Squid prints a WARNING with debug level 0 to get the | |
10311 | administrators attention. The value is in milliseconds. | |
a58ff010 | 10312 | DOC_END |
10313 | ||
5473c134 | 10314 | NAME: high_page_fault_warning |
10315 | TYPE: int | |
10316 | LOC: Config.warnings.high_pf | |
10317 | DEFAULT: 0 | |
638402dd | 10318 | DEFAULT_DOC: disabled. |
cc9f92d4 | 10319 | DOC_START |
5473c134 | 10320 | If the one-minute average page fault rate exceeds this |
10321 | value, Squid prints a WARNING with debug level 0 to get | |
10322 | the administrators attention. The value is in page faults | |
10323 | per second. | |
10324 | DOC_END | |
cc9f92d4 | 10325 | |
5473c134 | 10326 | NAME: high_memory_warning |
10327 | TYPE: b_size_t | |
10328 | LOC: Config.warnings.high_memory | |
f2228f3b | 10329 | IFDEF: HAVE_MSTATS&&HAVE_GNUMALLOC_H |
904971da | 10330 | DEFAULT: 0 KB |
638402dd | 10331 | DEFAULT_DOC: disabled. |
5473c134 | 10332 | DOC_START |
4bf2a476 FC |
10333 | If the memory usage (as determined by gnumalloc, if available and used) |
10334 | exceeds this amount, Squid prints a WARNING with debug level 0 to get | |
5473c134 | 10335 | the administrators attention. |
10336 | DOC_END | |
4bf2a476 | 10337 | # TODO: link high_memory_warning to mempools? |
cc9f92d4 | 10338 | |
5473c134 | 10339 | NAME: sleep_after_fork |
10340 | COMMENT: (microseconds) | |
10341 | TYPE: int | |
10342 | LOC: Config.sleep_after_fork | |
10343 | DEFAULT: 0 | |
10344 | DOC_START | |
10345 | When this is set to a non-zero value, the main Squid process | |
10346 | sleeps the specified number of microseconds after a fork() | |
10347 | system call. This sleep may help the situation where your | |
10348 | system reports fork() failures due to lack of (virtual) | |
10349 | memory. Note, however, if you have a lot of child | |
10350 | processes, these sleep delays will add up and your | |
10351 | Squid will not service requests for some amount of time | |
10352 | until all the child processes have been started. | |
10353 | On Windows value less then 1000 (1 milliseconds) are | |
10354 | rounded to 1000. | |
cc9f92d4 | 10355 | DOC_END |
10356 | ||
b6696974 | 10357 | NAME: windows_ipaddrchangemonitor |
7aa9bb3e | 10358 | IFDEF: _SQUID_WINDOWS_ |
b6696974 GS |
10359 | COMMENT: on|off |
10360 | TYPE: onoff | |
10361 | DEFAULT: on | |
10362 | LOC: Config.onoff.WIN32_IpAddrChangeMonitor | |
10363 | DOC_START | |
10364 | On Windows Squid by default will monitor IP address changes and will | |
10365 | reconfigure itself after any detected event. This is very useful for | |
10366 | proxies connected to internet with dial-up interfaces. | |
10367 | In some cases (a Proxy server acting as VPN gateway is one) it could be | |
10368 | desiderable to disable this behaviour setting this to 'off'. | |
10369 | Note: after changing this, Squid service must be restarted. | |
10370 | DOC_END | |
10371 | ||
a98c2da5 AJ |
10372 | NAME: eui_lookup |
10373 | TYPE: onoff | |
10374 | IFDEF: USE_SQUID_EUI | |
10375 | DEFAULT: on | |
10376 | LOC: Eui::TheConfig.euiLookup | |
10377 | DOC_START | |
10378 | Whether to lookup the EUI or MAC address of a connected client. | |
10379 | DOC_END | |
10380 | ||
f3f0f563 AJ |
10381 | NAME: max_filedescriptors max_filedesc |
10382 | TYPE: int | |
10383 | DEFAULT: 0 | |
638402dd | 10384 | DEFAULT_DOC: Use operating system limits set by ulimit. |
f3f0f563 AJ |
10385 | LOC: Config.max_filedescriptors |
10386 | DOC_START | |
638402dd AJ |
10387 | Reduce the maximum number of filedescriptors supported below |
10388 | the usual operating system defaults. | |
f3f0f563 | 10389 | |
638402dd | 10390 | Remove from squid.conf to inherit the current ulimit setting. |
f3f0f563 AJ |
10391 | |
10392 | Note: Changing this requires a restart of Squid. Also | |
638402dd | 10393 | not all I/O types supports large values (eg on Windows). |
f3f0f563 AJ |
10394 | DOC_END |
10395 | ||
ec69bdb2 CT |
10396 | NAME: force_request_body_continuation |
10397 | TYPE: acl_access | |
10398 | LOC: Config.accessList.forceRequestBodyContinuation | |
10399 | DEFAULT: none | |
10400 | DEFAULT_DOC: Deny, unless rules exist in squid.conf. | |
10401 | DOC_START | |
10402 | This option controls how Squid handles data upload requests from HTTP | |
10403 | and FTP agents that require a "Please Continue" control message response | |
10404 | to actually send the request body to Squid. It is mostly useful in | |
10405 | adaptation environments. | |
10406 | ||
10407 | When Squid receives an HTTP request with an "Expect: 100-continue" | |
10408 | header or an FTP upload command (e.g., STOR), Squid normally sends the | |
10409 | request headers or FTP command information to an adaptation service (or | |
10410 | peer) and waits for a response. Most adaptation services (and some | |
10411 | broken peers) may not respond to Squid at that stage because they may | |
10412 | decide to wait for the HTTP request body or FTP data transfer. However, | |
10413 | that request body or data transfer may never come because Squid has not | |
10414 | responded with the HTTP 100 or FTP 150 (Please Continue) control message | |
10415 | to the request sender yet! | |
10416 | ||
10417 | An allow match tells Squid to respond with the HTTP 100 or FTP 150 | |
10418 | (Please Continue) control message on its own, before forwarding the | |
10419 | request to an adaptation service or peer. Such a response usually forces | |
10420 | the request sender to proceed with sending the body. A deny match tells | |
10421 | Squid to delay that control response until the origin server confirms | |
10422 | that the request body is needed. Delaying is the default behavior. | |
10423 | DOC_END | |
10424 | ||
afc753f3 EB |
10425 | NAME: server_pconn_for_nonretriable |
10426 | TYPE: acl_access | |
10427 | DEFAULT: none | |
10428 | DEFAULT_DOC: Open new connections for forwarding requests Squid cannot retry safely. | |
10429 | LOC: Config.accessList.serverPconnForNonretriable | |
10430 | DOC_START | |
10431 | This option provides fine-grained control over persistent connection | |
10432 | reuse when forwarding HTTP requests that Squid cannot retry. It is useful | |
10433 | in environments where opening new connections is very expensive | |
10434 | (e.g., all connections are secured with TLS with complex client and server | |
10435 | certificate validation) and race conditions associated with persistent | |
10436 | connections are very rare and/or only cause minor problems. | |
10437 | ||
10438 | HTTP prohibits retrying unsafe and non-idempotent requests (e.g., POST). | |
10439 | Squid limitations also prohibit retrying all requests with bodies (e.g., PUT). | |
10440 | By default, when forwarding such "risky" requests, Squid opens a new | |
10441 | connection to the server or cache_peer, even if there is an idle persistent | |
10442 | connection available. When Squid is configured to risk sending a non-retriable | |
10443 | request on a previously used persistent connection, and the server closes | |
10444 | the connection before seeing that risky request, the user gets an error response | |
10445 | from Squid. In most cases, that error response will be HTTP 502 (Bad Gateway) | |
10446 | with ERR_ZERO_SIZE_OBJECT or ERR_WRITE_ERROR (peer connection reset) error detail. | |
10447 | ||
10448 | If an allow rule matches, Squid reuses an available idle persistent connection | |
10449 | (if any) for the request that Squid cannot retry. If a deny rule matches, then | |
10450 | Squid opens a new connection for the request that Squid cannot retry. | |
10451 | ||
10452 | This option does not affect requests that Squid can retry. They will reuse idle | |
10453 | persistent connections (if any). | |
10454 | ||
10455 | This clause only supports fast acl types. | |
10456 | See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. | |
10457 | ||
10458 | Example: | |
10459 | acl SpeedIsWorthTheRisk method POST | |
10460 | server_pconn_for_nonretriable allow SpeedIsWorthTheRisk | |
10461 | DOC_END | |
10462 | ||
cccac0a2 | 10463 | EOF |