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Commit | Line | Data |
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979e32fa | 1 | #include "cache.h" |
85023577 | 2 | #include "pkt-line.h" |
5d87dd4f JS |
3 | #include "run-command.h" |
4 | #include "strbuf.h" | |
3a3a29c1 | 5 | #include "string-list.h" |
f8ff0c06 | 6 | |
695dffe2 JS |
7 | #ifndef HOST_NAME_MAX |
8 | #define HOST_NAME_MAX 256 | |
9 | #endif | |
10 | ||
2844923d MD |
11 | #ifdef NO_INITGROUPS |
12 | #define initgroups(x, y) (0) /* nothing */ | |
13 | #endif | |
14 | ||
9048fe1c | 15 | static int log_syslog; |
f8ff0c06 | 16 | static int verbose; |
1955fabf | 17 | static int reuseaddr; |
d5570f4d | 18 | static int informative_errors; |
f8ff0c06 | 19 | |
960deccb | 20 | static const char daemon_usage[] = |
1b1dd23f | 21 | "git daemon [--verbose] [--syslog] [--export-all]\n" |
62b4698e ŠN |
22 | " [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n" |
23 | " [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n" | |
24 | " [--user-path | --user-path=<path>]\n" | |
25 | " [--interpolated-path=<path>]\n" | |
9cddf56e | 26 | " [--reuseaddr] [--pid-file=<file>]\n" |
62b4698e | 27 | " [--(enable|disable|allow-override|forbid-override)=<service>]\n" |
93741e4a | 28 | " [--access-hook=<path>]\n" |
62b4698e | 29 | " [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n" |
9cddf56e | 30 | " [--detach] [--user=<user> [--group=<group>]]\n" |
62b4698e | 31 | " [<directory>...]"; |
4ae95682 PA |
32 | |
33 | /* List of acceptable pathname prefixes */ | |
3f2e2297 | 34 | static const char **ok_paths; |
96f1e58f | 35 | static int strict_paths; |
4ae95682 PA |
36 | |
37 | /* If this is set, git-daemon-export-ok is not required */ | |
96f1e58f | 38 | static int export_all_trees; |
f8ff0c06 | 39 | |
b21c31c9 | 40 | /* Take all paths relative to this one if non-NULL */ |
1055a890 JK |
41 | static const char *base_path; |
42 | static const char *interpolated_path; | |
73a7a656 | 43 | static int base_path_relaxed; |
49ba83fb | 44 | |
603968d2 JH |
45 | /* If defined, ~user notation is allowed and the string is inserted |
46 | * after ~user/. E.g. a request to git://host/~alice/frotz would | |
47 | * go to /home/alice/pub_git/frotz with --user-path=pub_git. | |
48 | */ | |
96f1e58f | 49 | static const char *user_path; |
603968d2 | 50 | |
960deccb | 51 | /* Timeout, and initial timeout */ |
96f1e58f DR |
52 | static unsigned int timeout; |
53 | static unsigned int init_timeout; | |
f8ff0c06 | 54 | |
01cec54e RS |
55 | struct hostinfo { |
56 | struct strbuf hostname; | |
57 | struct strbuf canon_hostname; | |
58 | struct strbuf ip_address; | |
59 | struct strbuf tcp_port; | |
60 | unsigned int hostname_lookup_done:1; | |
61 | unsigned int saw_extended_args:1; | |
62 | }; | |
edef953e | 63 | |
01cec54e | 64 | static void lookup_hostname(struct hostinfo *hi); |
edef953e | 65 | |
01cec54e | 66 | static const char *get_canon_hostname(struct hostinfo *hi) |
edef953e | 67 | { |
01cec54e RS |
68 | lookup_hostname(hi); |
69 | return hi->canon_hostname.buf; | |
edef953e RS |
70 | } |
71 | ||
01cec54e | 72 | static const char *get_ip_address(struct hostinfo *hi) |
edef953e | 73 | { |
01cec54e RS |
74 | lookup_hostname(hi); |
75 | return hi->ip_address.buf; | |
edef953e RS |
76 | } |
77 | ||
9048fe1c | 78 | static void logreport(int priority, const char *err, va_list params) |
f8ff0c06 | 79 | { |
9048fe1c | 80 | if (log_syslog) { |
6a992e9e SB |
81 | char buf[1024]; |
82 | vsnprintf(buf, sizeof(buf), err, params); | |
9048fe1c | 83 | syslog(priority, "%s", buf); |
460c2010 JH |
84 | } else { |
85 | /* | |
48cfaea1 | 86 | * Since stderr is set to buffered mode, the |
6a992e9e | 87 | * logging of different processes will not overlap |
48cfaea1 | 88 | * unless they overflow the (rather big) buffers. |
6a992e9e | 89 | */ |
85e72830 | 90 | fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid()); |
6a992e9e SB |
91 | vfprintf(stderr, err, params); |
92 | fputc('\n', stderr); | |
48cfaea1 | 93 | fflush(stderr); |
6a992e9e | 94 | } |
f8ff0c06 PB |
95 | } |
96 | ||
28bea9e5 | 97 | __attribute__((format (printf, 1, 2))) |
cdda4745 | 98 | static void logerror(const char *err, ...) |
f8ff0c06 PB |
99 | { |
100 | va_list params; | |
101 | va_start(params, err); | |
9048fe1c | 102 | logreport(LOG_ERR, err, params); |
f8ff0c06 PB |
103 | va_end(params); |
104 | } | |
105 | ||
28bea9e5 | 106 | __attribute__((format (printf, 1, 2))) |
cdda4745 | 107 | static void loginfo(const char *err, ...) |
f8ff0c06 PB |
108 | { |
109 | va_list params; | |
110 | if (!verbose) | |
111 | return; | |
112 | va_start(params, err); | |
9048fe1c | 113 | logreport(LOG_INFO, err, params); |
f8ff0c06 PB |
114 | va_end(params); |
115 | } | |
a87e8be2 | 116 | |
ad8b4f56 ML |
117 | static void NORETURN daemon_die(const char *err, va_list params) |
118 | { | |
119 | logreport(LOG_ERR, err, params); | |
120 | exit(1); | |
121 | } | |
122 | ||
dc8edc8f RS |
123 | struct expand_path_context { |
124 | const char *directory; | |
01cec54e | 125 | struct hostinfo *hostinfo; |
dc8edc8f RS |
126 | }; |
127 | ||
128 | static size_t expand_path(struct strbuf *sb, const char *placeholder, void *ctx) | |
129 | { | |
130 | struct expand_path_context *context = ctx; | |
01cec54e | 131 | struct hostinfo *hi = context->hostinfo; |
dc8edc8f RS |
132 | |
133 | switch (placeholder[0]) { | |
134 | case 'H': | |
01cec54e | 135 | strbuf_addbuf(sb, &hi->hostname); |
dc8edc8f RS |
136 | return 1; |
137 | case 'C': | |
138 | if (placeholder[1] == 'H') { | |
01cec54e | 139 | strbuf_addstr(sb, get_canon_hostname(hi)); |
dc8edc8f RS |
140 | return 2; |
141 | } | |
142 | break; | |
143 | case 'I': | |
144 | if (placeholder[1] == 'P') { | |
01cec54e | 145 | strbuf_addstr(sb, get_ip_address(hi)); |
dc8edc8f RS |
146 | return 2; |
147 | } | |
148 | break; | |
149 | case 'P': | |
01cec54e | 150 | strbuf_addbuf(sb, &hi->tcp_port); |
dc8edc8f RS |
151 | return 1; |
152 | case 'D': | |
153 | strbuf_addstr(sb, context->directory); | |
154 | return 1; | |
155 | } | |
156 | return 0; | |
157 | } | |
158 | ||
01cec54e | 159 | static const char *path_ok(const char *directory, struct hostinfo *hi) |
4ae95682 | 160 | { |
603968d2 | 161 | static char rpath[PATH_MAX]; |
49ba83fb | 162 | static char interp_path[PATH_MAX]; |
6bdb0083 | 163 | size_t rlen; |
1c64b48e | 164 | const char *path; |
1055a890 | 165 | const char *dir; |
49ba83fb | 166 | |
9d7ca667 | 167 | dir = directory; |
d79374c7 | 168 | |
34b6cb8b | 169 | if (daemon_avoid_alias(dir)) { |
d79374c7 JH |
170 | logerror("'%s': aliased", dir); |
171 | return NULL; | |
172 | } | |
173 | ||
603968d2 JH |
174 | if (*dir == '~') { |
175 | if (!user_path) { | |
176 | logerror("'%s': User-path not allowed", dir); | |
177 | return NULL; | |
178 | } | |
179 | if (*user_path) { | |
180 | /* Got either "~alice" or "~alice/foo"; | |
181 | * rewrite them to "~alice/%s" or | |
182 | * "~alice/%s/foo". | |
183 | */ | |
184 | int namlen, restlen = strlen(dir); | |
1055a890 | 185 | const char *slash = strchr(dir, '/'); |
603968d2 JH |
186 | if (!slash) |
187 | slash = dir + restlen; | |
188 | namlen = slash - dir; | |
189 | restlen -= namlen; | |
190 | loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash); | |
6bdb0083 JK |
191 | rlen = snprintf(rpath, sizeof(rpath), "%.*s/%s%.*s", |
192 | namlen, dir, user_path, restlen, slash); | |
193 | if (rlen >= sizeof(rpath)) { | |
194 | logerror("user-path too large: %s", rpath); | |
195 | return NULL; | |
196 | } | |
603968d2 JH |
197 | dir = rpath; |
198 | } | |
199 | } | |
01cec54e | 200 | else if (interpolated_path && hi->saw_extended_args) { |
9d7ca667 | 201 | struct strbuf expanded_path = STRBUF_INIT; |
dc8edc8f RS |
202 | struct expand_path_context context; |
203 | ||
204 | context.directory = directory; | |
01cec54e | 205 | context.hostinfo = hi; |
dc8edc8f | 206 | |
49ba83fb JL |
207 | if (*dir != '/') { |
208 | /* Allow only absolute */ | |
209 | logerror("'%s': Non-absolute path denied (interpolated-path active)", dir); | |
210 | return NULL; | |
211 | } | |
212 | ||
9d7ca667 | 213 | strbuf_expand(&expanded_path, interpolated_path, |
dc8edc8f | 214 | expand_path, &context); |
6bdb0083 JK |
215 | |
216 | rlen = strlcpy(interp_path, expanded_path.buf, | |
217 | sizeof(interp_path)); | |
218 | if (rlen >= sizeof(interp_path)) { | |
219 | logerror("interpolated path too large: %s", | |
220 | interp_path); | |
221 | return NULL; | |
222 | } | |
223 | ||
9d7ca667 | 224 | strbuf_release(&expanded_path); |
49ba83fb JL |
225 | loginfo("Interpolated dir '%s'", interp_path); |
226 | ||
227 | dir = interp_path; | |
228 | } | |
603968d2 JH |
229 | else if (base_path) { |
230 | if (*dir != '/') { | |
231 | /* Allow only absolute */ | |
1fda3d55 | 232 | logerror("'%s': Non-absolute path denied (base-path active)", dir); |
b21c31c9 PB |
233 | return NULL; |
234 | } | |
6bdb0083 JK |
235 | rlen = snprintf(rpath, sizeof(rpath), "%s%s", base_path, dir); |
236 | if (rlen >= sizeof(rpath)) { | |
237 | logerror("base-path too large: %s", rpath); | |
238 | return NULL; | |
239 | } | |
49ba83fb | 240 | dir = rpath; |
b21c31c9 PB |
241 | } |
242 | ||
a583971f RS |
243 | path = enter_repo(dir, strict_paths); |
244 | if (!path && base_path && base_path_relaxed) { | |
73a7a656 JA |
245 | /* |
246 | * if we fail and base_path_relaxed is enabled, try without | |
247 | * prefixing the base path | |
248 | */ | |
a583971f RS |
249 | dir = directory; |
250 | path = enter_repo(dir, strict_paths); | |
251 | } | |
3e04c62d | 252 | |
4dbd1352 | 253 | if (!path) { |
05ac6b34 | 254 | logerror("'%s' does not appear to be a git repository", dir); |
4dbd1352 | 255 | return NULL; |
4ae95682 PA |
256 | } |
257 | ||
258 | if ( ok_paths && *ok_paths ) { | |
3f2e2297 | 259 | const char **pp; |
4dbd1352 | 260 | int pathlen = strlen(path); |
4ae95682 | 261 | |
ce335fe0 | 262 | /* The validation is done on the paths after enter_repo |
a6080a0a | 263 | * appends optional {.git,.git/.git} and friends, but |
d79374c7 JH |
264 | * it does not use getcwd(). So if your /pub is |
265 | * a symlink to /mnt/pub, you can whitelist /pub and | |
266 | * do not have to say /mnt/pub. | |
267 | * Do not say /pub/. | |
ce335fe0 | 268 | */ |
4ae95682 PA |
269 | for ( pp = ok_paths ; *pp ; pp++ ) { |
270 | int len = strlen(*pp); | |
ce335fe0 JH |
271 | if (len <= pathlen && |
272 | !memcmp(*pp, path, len) && | |
273 | (path[len] == '\0' || | |
274 | (!strict_paths && path[len] == '/'))) | |
275 | return path; | |
4ae95682 | 276 | } |
4dbd1352 AE |
277 | } |
278 | else { | |
279 | /* be backwards compatible */ | |
280 | if (!strict_paths) | |
281 | return path; | |
4ae95682 PA |
282 | } |
283 | ||
4dbd1352 AE |
284 | logerror("'%s': not in whitelist", path); |
285 | return NULL; /* Fallthrough. Deny by default */ | |
4ae95682 | 286 | } |
a87e8be2 | 287 | |
d819e4e6 JH |
288 | typedef int (*daemon_service_fn)(void); |
289 | struct daemon_service { | |
290 | const char *name; | |
291 | const char *config_name; | |
292 | daemon_service_fn fn; | |
293 | int enabled; | |
294 | int overridable; | |
295 | }; | |
296 | ||
d5570f4d JK |
297 | static int daemon_error(const char *dir, const char *msg) |
298 | { | |
299 | if (!informative_errors) | |
300 | msg = "access denied or repository not exported"; | |
81c634e9 | 301 | packet_write_fmt(1, "ERR %s: %s", msg, dir); |
d5570f4d JK |
302 | return -1; |
303 | } | |
304 | ||
1055a890 | 305 | static const char *access_hook; |
93741e4a | 306 | |
01cec54e RS |
307 | static int run_access_hook(struct daemon_service *service, const char *dir, |
308 | const char *path, struct hostinfo *hi) | |
93741e4a | 309 | { |
d3180279 | 310 | struct child_process child = CHILD_PROCESS_INIT; |
93741e4a JH |
311 | struct strbuf buf = STRBUF_INIT; |
312 | const char *argv[8]; | |
313 | const char **arg = argv; | |
314 | char *eol; | |
315 | int seen_errors = 0; | |
316 | ||
93741e4a JH |
317 | *arg++ = access_hook; |
318 | *arg++ = service->name; | |
319 | *arg++ = path; | |
01cec54e RS |
320 | *arg++ = hi->hostname.buf; |
321 | *arg++ = get_canon_hostname(hi); | |
322 | *arg++ = get_ip_address(hi); | |
323 | *arg++ = hi->tcp_port.buf; | |
93741e4a | 324 | *arg = NULL; |
93741e4a | 325 | |
93741e4a JH |
326 | child.use_shell = 1; |
327 | child.argv = argv; | |
328 | child.no_stdin = 1; | |
329 | child.no_stderr = 1; | |
330 | child.out = -1; | |
331 | if (start_command(&child)) { | |
332 | logerror("daemon access hook '%s' failed to start", | |
333 | access_hook); | |
334 | goto error_return; | |
335 | } | |
336 | if (strbuf_read(&buf, child.out, 0) < 0) { | |
337 | logerror("failed to read from pipe to daemon access hook '%s'", | |
338 | access_hook); | |
339 | strbuf_reset(&buf); | |
340 | seen_errors = 1; | |
341 | } | |
342 | if (close(child.out) < 0) { | |
343 | logerror("failed to close pipe to daemon access hook '%s'", | |
344 | access_hook); | |
345 | seen_errors = 1; | |
346 | } | |
347 | if (finish_command(&child)) | |
348 | seen_errors = 1; | |
349 | ||
350 | if (!seen_errors) { | |
351 | strbuf_release(&buf); | |
352 | return 0; | |
353 | } | |
354 | ||
355 | error_return: | |
356 | strbuf_ltrim(&buf); | |
357 | if (!buf.len) | |
358 | strbuf_addstr(&buf, "service rejected"); | |
359 | eol = strchr(buf.buf, '\n'); | |
360 | if (eol) | |
361 | *eol = '\0'; | |
362 | errno = EACCES; | |
363 | daemon_error(dir, buf.buf); | |
364 | strbuf_release(&buf); | |
365 | return -1; | |
366 | } | |
367 | ||
01cec54e RS |
368 | static int run_service(const char *dir, struct daemon_service *service, |
369 | struct hostinfo *hi) | |
a87e8be2 | 370 | { |
4dbd1352 | 371 | const char *path; |
d819e4e6 | 372 | int enabled = service->enabled; |
8939d32d | 373 | struct strbuf var = STRBUF_INIT; |
d819e4e6 | 374 | |
a47551c3 | 375 | loginfo("Request %s for '%s'", service->name, dir); |
4dbd1352 | 376 | |
d819e4e6 JH |
377 | if (!enabled && !service->overridable) { |
378 | logerror("'%s': service not enabled.", service->name); | |
379 | errno = EACCES; | |
d5570f4d | 380 | return daemon_error(dir, "service not enabled"); |
d819e4e6 | 381 | } |
4ae95682 | 382 | |
01cec54e | 383 | if (!(path = path_ok(dir, hi))) |
d5570f4d | 384 | return daemon_error(dir, "no such repository"); |
47888f0f | 385 | |
a87e8be2 LT |
386 | /* |
387 | * Security on the cheap. | |
388 | * | |
a935c397 | 389 | * We want a readable HEAD, usable "objects" directory, and |
a87e8be2 LT |
390 | * a "git-daemon-export-ok" flag that says that the other side |
391 | * is ok with us doing this. | |
4dbd1352 AE |
392 | * |
393 | * path_ok() uses enter_repo() and does whitelist checking. | |
394 | * We only need to make sure the repository is exported. | |
a87e8be2 | 395 | */ |
4dbd1352 | 396 | |
3e04c62d | 397 | if (!export_all_trees && access("git-daemon-export-ok", F_OK)) { |
4dbd1352 | 398 | logerror("'%s': repository not exported.", path); |
3e04c62d | 399 | errno = EACCES; |
d5570f4d | 400 | return daemon_error(dir, "repository not exported"); |
3e04c62d PA |
401 | } |
402 | ||
d819e4e6 | 403 | if (service->overridable) { |
8939d32d TA |
404 | strbuf_addf(&var, "daemon.%s", service->config_name); |
405 | git_config_get_bool(var.buf, &enabled); | |
406 | strbuf_release(&var); | |
d819e4e6 JH |
407 | } |
408 | if (!enabled) { | |
409 | logerror("'%s': service not enabled for '%s'", | |
410 | service->name, path); | |
411 | errno = EACCES; | |
d5570f4d | 412 | return daemon_error(dir, "service not enabled"); |
d819e4e6 JH |
413 | } |
414 | ||
93741e4a JH |
415 | /* |
416 | * Optionally, a hook can choose to deny access to the | |
417 | * repository depending on the phase of the moon. | |
418 | */ | |
01cec54e | 419 | if (access_hook && run_access_hook(service, dir, path, hi)) |
93741e4a JH |
420 | return -1; |
421 | ||
02d57da4 LT |
422 | /* |
423 | * We'll ignore SIGTERM from now on, we have a | |
424 | * good client. | |
425 | */ | |
426 | signal(SIGTERM, SIG_IGN); | |
427 | ||
d819e4e6 JH |
428 | return service->fn(); |
429 | } | |
430 | ||
5d87dd4f JS |
431 | static void copy_to_log(int fd) |
432 | { | |
433 | struct strbuf line = STRBUF_INIT; | |
434 | FILE *fp; | |
435 | ||
436 | fp = fdopen(fd, "r"); | |
437 | if (fp == NULL) { | |
438 | logerror("fdopen of error channel failed"); | |
439 | close(fd); | |
440 | return; | |
441 | } | |
442 | ||
8f309aeb | 443 | while (strbuf_getline_lf(&line, fp) != EOF) { |
5d87dd4f JS |
444 | logerror("%s", line.buf); |
445 | strbuf_setlen(&line, 0); | |
446 | } | |
447 | ||
448 | strbuf_release(&line); | |
449 | fclose(fp); | |
450 | } | |
451 | ||
452 | static int run_service_command(const char **argv) | |
453 | { | |
d3180279 | 454 | struct child_process cld = CHILD_PROCESS_INIT; |
5d87dd4f | 455 | |
5d87dd4f JS |
456 | cld.argv = argv; |
457 | cld.git_cmd = 1; | |
458 | cld.err = -1; | |
459 | if (start_command(&cld)) | |
460 | return -1; | |
461 | ||
462 | close(0); | |
463 | close(1); | |
464 | ||
465 | copy_to_log(cld.err); | |
466 | ||
467 | return finish_command(&cld); | |
468 | } | |
469 | ||
d819e4e6 JH |
470 | static int upload_pack(void) |
471 | { | |
472 | /* Timeout as string */ | |
473 | char timeout_buf[64]; | |
66dbfd55 GV |
474 | const char *argv[] = { "upload-pack", "--strict", NULL, ".", NULL }; |
475 | ||
476 | argv[2] = timeout_buf; | |
d819e4e6 | 477 | |
960deccb | 478 | snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout); |
5d87dd4f | 479 | return run_service_command(argv); |
a87e8be2 LT |
480 | } |
481 | ||
39345a21 FBH |
482 | static int upload_archive(void) |
483 | { | |
5d87dd4f JS |
484 | static const char *argv[] = { "upload-archive", ".", NULL }; |
485 | return run_service_command(argv); | |
39345a21 FBH |
486 | } |
487 | ||
4b3b1e1e LT |
488 | static int receive_pack(void) |
489 | { | |
5d87dd4f JS |
490 | static const char *argv[] = { "receive-pack", ".", NULL }; |
491 | return run_service_command(argv); | |
4b3b1e1e LT |
492 | } |
493 | ||
d819e4e6 | 494 | static struct daemon_service daemon_service[] = { |
39345a21 | 495 | { "upload-archive", "uploadarch", upload_archive, 0, 1 }, |
d819e4e6 | 496 | { "upload-pack", "uploadpack", upload_pack, 1, 1 }, |
4b3b1e1e | 497 | { "receive-pack", "receivepack", receive_pack, 0, 1 }, |
d819e4e6 JH |
498 | }; |
499 | ||
f3fa1838 JH |
500 | static void enable_service(const char *name, int ena) |
501 | { | |
d819e4e6 JH |
502 | int i; |
503 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { | |
504 | if (!strcmp(daemon_service[i].name, name)) { | |
505 | daemon_service[i].enabled = ena; | |
506 | return; | |
507 | } | |
508 | } | |
509 | die("No such service %s", name); | |
510 | } | |
511 | ||
f3fa1838 JH |
512 | static void make_service_overridable(const char *name, int ena) |
513 | { | |
d819e4e6 JH |
514 | int i; |
515 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { | |
516 | if (!strcmp(daemon_service[i].name, name)) { | |
517 | daemon_service[i].overridable = ena; | |
518 | return; | |
519 | } | |
520 | } | |
521 | die("No such service %s", name); | |
522 | } | |
523 | ||
e8dbd76d IL |
524 | static void parse_host_and_port(char *hostport, char **host, |
525 | char **port) | |
526 | { | |
527 | if (*hostport == '[') { | |
528 | char *end; | |
529 | ||
530 | end = strchr(hostport, ']'); | |
531 | if (!end) | |
9517e6b8 | 532 | die("Invalid request ('[' without ']')"); |
e8dbd76d IL |
533 | *end = '\0'; |
534 | *host = hostport + 1; | |
535 | if (!end[1]) | |
536 | *port = NULL; | |
537 | else if (end[1] == ':') | |
538 | *port = end + 2; | |
539 | else | |
540 | die("Garbage after end of host part"); | |
541 | } else { | |
542 | *host = hostport; | |
543 | *port = strrchr(hostport, ':'); | |
544 | if (*port) { | |
e9bd3235 | 545 | **port = '\0'; |
e8dbd76d IL |
546 | ++*port; |
547 | } | |
548 | } | |
549 | } | |
550 | ||
b4853730 JK |
551 | /* |
552 | * Sanitize a string from the client so that it's OK to be inserted into a | |
553 | * filesystem path. Specifically, we disallow slashes, runs of "..", and | |
554 | * trailing and leading dots, which means that the client cannot escape | |
555 | * our base path via ".." traversal. | |
556 | */ | |
7a646cec | 557 | static void sanitize_client(struct strbuf *out, const char *in) |
b4853730 JK |
558 | { |
559 | for (; *in; in++) { | |
560 | if (*in == '/') | |
561 | continue; | |
562 | if (*in == '.' && (!out->len || out->buf[out->len - 1] == '.')) | |
563 | continue; | |
564 | strbuf_addch(out, *in); | |
565 | } | |
566 | ||
567 | while (out->len && out->buf[out->len - 1] == '.') | |
568 | strbuf_setlen(out, out->len - 1); | |
569 | } | |
570 | ||
b4853730 JK |
571 | /* |
572 | * Like sanitize_client, but we also perform any canonicalization | |
573 | * to make life easier on the admin. | |
574 | */ | |
7a646cec | 575 | static void canonicalize_client(struct strbuf *out, const char *in) |
b4853730 | 576 | { |
7a646cec RS |
577 | sanitize_client(out, in); |
578 | strbuf_tolower(out); | |
b4853730 JK |
579 | } |
580 | ||
eb30aed7 | 581 | /* |
73bb33a9 | 582 | * Read the host as supplied by the client connection. |
eb30aed7 | 583 | */ |
01cec54e | 584 | static void parse_host_arg(struct hostinfo *hi, char *extra_args, int buflen) |
49ba83fb JL |
585 | { |
586 | char *val; | |
587 | int vallen; | |
588 | char *end = extra_args + buflen; | |
589 | ||
73bb33a9 | 590 | if (extra_args < end && *extra_args) { |
01cec54e | 591 | hi->saw_extended_args = 1; |
49ba83fb JL |
592 | if (strncasecmp("host=", extra_args, 5) == 0) { |
593 | val = extra_args + 5; | |
594 | vallen = strlen(val) + 1; | |
595 | if (*val) { | |
eb30aed7 | 596 | /* Split <host>:<port> at colon. */ |
e8dbd76d IL |
597 | char *host; |
598 | char *port; | |
599 | parse_host_and_port(val, &host, &port); | |
01cec54e RS |
600 | if (port) |
601 | sanitize_client(&hi->tcp_port, port); | |
602 | canonicalize_client(&hi->hostname, host); | |
603 | hi->hostname_lookup_done = 0; | |
49ba83fb | 604 | } |
eb30aed7 | 605 | |
49ba83fb JL |
606 | /* On to the next one */ |
607 | extra_args = val + vallen; | |
608 | } | |
73bb33a9 SP |
609 | if (extra_args < end && *extra_args) |
610 | die("Invalid request"); | |
49ba83fb | 611 | } |
edef953e | 612 | } |
dd467629 | 613 | |
edef953e RS |
614 | /* |
615 | * Locate canonical hostname and its IP address. | |
616 | */ | |
01cec54e | 617 | static void lookup_hostname(struct hostinfo *hi) |
edef953e | 618 | { |
01cec54e | 619 | if (!hi->hostname_lookup_done && hi->hostname.len) { |
dd467629 | 620 | #ifndef NO_IPV6 |
dd467629 | 621 | struct addrinfo hints; |
3e8a00ae | 622 | struct addrinfo *ai; |
dd467629 JL |
623 | int gai; |
624 | static char addrbuf[HOST_NAME_MAX + 1]; | |
625 | ||
626 | memset(&hints, 0, sizeof(hints)); | |
627 | hints.ai_flags = AI_CANONNAME; | |
628 | ||
01cec54e | 629 | gai = getaddrinfo(hi->hostname.buf, NULL, &hints, &ai); |
dd467629 | 630 | if (!gai) { |
3e8a00ae BK |
631 | struct sockaddr_in *sin_addr = (void *)ai->ai_addr; |
632 | ||
633 | inet_ntop(AF_INET, &sin_addr->sin_addr, | |
634 | addrbuf, sizeof(addrbuf)); | |
01cec54e | 635 | strbuf_addstr(&hi->ip_address, addrbuf); |
3e8a00ae | 636 | |
7a646cec | 637 | if (ai->ai_canonname) |
01cec54e | 638 | sanitize_client(&hi->canon_hostname, |
7a646cec RS |
639 | ai->ai_canonname); |
640 | else | |
01cec54e RS |
641 | strbuf_addbuf(&hi->canon_hostname, |
642 | &hi->ip_address); | |
3e8a00ae BK |
643 | |
644 | freeaddrinfo(ai); | |
dd467629 | 645 | } |
dd467629 | 646 | #else |
dd467629 JL |
647 | struct hostent *hent; |
648 | struct sockaddr_in sa; | |
649 | char **ap; | |
650 | static char addrbuf[HOST_NAME_MAX + 1]; | |
651 | ||
d358f771 | 652 | hent = gethostbyname(hi->hostname.buf); |
eb6c4035 RS |
653 | if (hent) { |
654 | ap = hent->h_addr_list; | |
655 | memset(&sa, 0, sizeof sa); | |
656 | sa.sin_family = hent->h_addrtype; | |
657 | sa.sin_port = htons(0); | |
658 | memcpy(&sa.sin_addr, *ap, hent->h_length); | |
659 | ||
660 | inet_ntop(hent->h_addrtype, &sa.sin_addr, | |
661 | addrbuf, sizeof(addrbuf)); | |
dd467629 | 662 | |
01cec54e RS |
663 | sanitize_client(&hi->canon_hostname, hent->h_name); |
664 | strbuf_addstr(&hi->ip_address, addrbuf); | |
eb6c4035 | 665 | } |
dd467629 | 666 | #endif |
01cec54e | 667 | hi->hostname_lookup_done = 1; |
6720e95b | 668 | } |
dd467629 JL |
669 | } |
670 | ||
01cec54e RS |
671 | static void hostinfo_init(struct hostinfo *hi) |
672 | { | |
673 | memset(hi, 0, sizeof(*hi)); | |
674 | strbuf_init(&hi->hostname, 0); | |
675 | strbuf_init(&hi->canon_hostname, 0); | |
676 | strbuf_init(&hi->ip_address, 0); | |
677 | strbuf_init(&hi->tcp_port, 0); | |
678 | } | |
679 | ||
680 | static void hostinfo_clear(struct hostinfo *hi) | |
681 | { | |
682 | strbuf_release(&hi->hostname); | |
683 | strbuf_release(&hi->canon_hostname); | |
684 | strbuf_release(&hi->ip_address); | |
685 | strbuf_release(&hi->tcp_port); | |
686 | } | |
dd467629 | 687 | |
a43b68a1 EW |
688 | static void set_keep_alive(int sockfd) |
689 | { | |
690 | int ka = 1; | |
691 | ||
49c58d86 EW |
692 | if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) { |
693 | if (errno != ENOTSOCK) | |
694 | logerror("unable to set SO_KEEPALIVE on socket: %s", | |
695 | strerror(errno)); | |
696 | } | |
a43b68a1 EW |
697 | } |
698 | ||
f9c87be6 | 699 | static int execute(void) |
a87e8be2 | 700 | { |
74543a04 | 701 | char *line = packet_buffer; |
d819e4e6 | 702 | int pktlen, len, i; |
f9c87be6 | 703 | char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT"); |
01cec54e RS |
704 | struct hostinfo hi; |
705 | ||
706 | hostinfo_init(&hi); | |
7d80694a | 707 | |
f9c87be6 EFL |
708 | if (addr) |
709 | loginfo("Connection from %s:%s", addr, port); | |
5b276ee4 | 710 | |
a43b68a1 | 711 | set_keep_alive(0); |
960deccb | 712 | alarm(init_timeout ? init_timeout : timeout); |
4981fe75 | 713 | pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0); |
960deccb | 714 | alarm(0); |
7d80694a | 715 | |
5ad312be JL |
716 | len = strlen(line); |
717 | if (pktlen != len) | |
718 | loginfo("Extended attributes (%d bytes) exist <%.*s>", | |
719 | (int) pktlen - len, | |
720 | (int) pktlen - len, line + len + 1); | |
83543a24 | 721 | if (len && line[len-1] == '\n') { |
7d80694a | 722 | line[--len] = 0; |
83543a24 JH |
723 | pktlen--; |
724 | } | |
7d80694a | 725 | |
d433ed0b | 726 | if (len != pktlen) |
01cec54e | 727 | parse_host_arg(&hi, line + len + 1, pktlen - len - 1); |
49ba83fb | 728 | |
d819e4e6 JH |
729 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { |
730 | struct daemon_service *s = &(daemon_service[i]); | |
d12c24d2 JK |
731 | const char *arg; |
732 | ||
733 | if (skip_prefix(line, "git-", &arg) && | |
734 | skip_prefix(arg, s->name, &arg) && | |
735 | *arg++ == ' ') { | |
eb30aed7 JL |
736 | /* |
737 | * Note: The directory here is probably context sensitive, | |
738 | * and might depend on the actual service being performed. | |
739 | */ | |
01cec54e RS |
740 | int rc = run_service(arg, s, &hi); |
741 | hostinfo_clear(&hi); | |
742 | return rc; | |
49ba83fb | 743 | } |
d819e4e6 | 744 | } |
a87e8be2 | 745 | |
01cec54e | 746 | hostinfo_clear(&hi); |
f8ff0c06 | 747 | logerror("Protocol error: '%s'", line); |
a87e8be2 LT |
748 | return -1; |
749 | } | |
750 | ||
15515b73 EFL |
751 | static int addrcmp(const struct sockaddr_storage *s1, |
752 | const struct sockaddr_storage *s2) | |
753 | { | |
3aff874a BC |
754 | const struct sockaddr *sa1 = (const struct sockaddr*) s1; |
755 | const struct sockaddr *sa2 = (const struct sockaddr*) s2; | |
756 | ||
757 | if (sa1->sa_family != sa2->sa_family) | |
758 | return sa1->sa_family - sa2->sa_family; | |
759 | if (sa1->sa_family == AF_INET) | |
15515b73 EFL |
760 | return memcmp(&((struct sockaddr_in *)s1)->sin_addr, |
761 | &((struct sockaddr_in *)s2)->sin_addr, | |
762 | sizeof(struct in_addr)); | |
763 | #ifndef NO_IPV6 | |
3aff874a | 764 | if (sa1->sa_family == AF_INET6) |
15515b73 EFL |
765 | return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr, |
766 | &((struct sockaddr_in6 *)s2)->sin6_addr, | |
767 | sizeof(struct in6_addr)); | |
768 | #endif | |
769 | return 0; | |
770 | } | |
771 | ||
3bd62c21 | 772 | static int max_connections = 32; |
66e631de | 773 | |
3bd62c21 | 774 | static unsigned int live_children; |
66e631de | 775 | |
4d8fa916 | 776 | static struct child { |
3bd62c21 | 777 | struct child *next; |
30e15602 | 778 | struct child_process cld; |
df076bdb | 779 | struct sockaddr_storage address; |
3bd62c21 | 780 | } *firstborn; |
66e631de | 781 | |
c295cf06 | 782 | static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen) |
66e631de | 783 | { |
460c2010 JH |
784 | struct child *newborn, **cradle; |
785 | ||
460c2010 JH |
786 | newborn = xcalloc(1, sizeof(*newborn)); |
787 | live_children++; | |
30e15602 | 788 | memcpy(&newborn->cld, cld, sizeof(*cld)); |
460c2010 JH |
789 | memcpy(&newborn->address, addr, addrlen); |
790 | for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next) | |
15515b73 | 791 | if (!addrcmp(&(*cradle)->address, &newborn->address)) |
460c2010 JH |
792 | break; |
793 | newborn->next = *cradle; | |
794 | *cradle = newborn; | |
66e631de LT |
795 | } |
796 | ||
66e631de LT |
797 | /* |
798 | * This gets called if the number of connections grows | |
799 | * past "max_connections". | |
800 | * | |
3bd62c21 | 801 | * We kill the newest connection from a duplicate IP. |
66e631de | 802 | */ |
3bd62c21 | 803 | static void kill_some_child(void) |
66e631de | 804 | { |
460c2010 | 805 | const struct child *blanket, *next; |
66e631de | 806 | |
460c2010 JH |
807 | if (!(blanket = firstborn)) |
808 | return; | |
695605b5 | 809 | |
460c2010 | 810 | for (; (next = blanket->next); blanket = next) |
15515b73 | 811 | if (!addrcmp(&blanket->address, &next->address)) { |
30e15602 | 812 | kill(blanket->cld.pid, SIGTERM); |
460c2010 JH |
813 | break; |
814 | } | |
a5a9126b JS |
815 | } |
816 | ||
3bd62c21 | 817 | static void check_dead_children(void) |
a87e8be2 | 818 | { |
3bd62c21 SB |
819 | int status; |
820 | pid_t pid; | |
02d57da4 | 821 | |
30e15602 EFL |
822 | struct child **cradle, *blanket; |
823 | for (cradle = &firstborn; (blanket = *cradle);) | |
824 | if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) { | |
825 | const char *dead = ""; | |
826 | if (status) | |
827 | dead = " (with error)"; | |
828 | loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead); | |
829 | ||
830 | /* remove the child */ | |
831 | *cradle = blanket->next; | |
832 | live_children--; | |
b1b49ff8 | 833 | child_process_clear(&blanket->cld); |
30e15602 EFL |
834 | free(blanket); |
835 | } else | |
836 | cradle = &blanket->next; | |
02d57da4 LT |
837 | } |
838 | ||
850d2fec | 839 | static struct argv_array cld_argv = ARGV_ARRAY_INIT; |
c295cf06 | 840 | static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen) |
02d57da4 | 841 | { |
d3180279 | 842 | struct child_process cld = CHILD_PROCESS_INIT; |
02d57da4 | 843 | |
3bd62c21 SB |
844 | if (max_connections && live_children >= max_connections) { |
845 | kill_some_child(); | |
460c2010 | 846 | sleep(1); /* give it some time to die */ |
3bd62c21 SB |
847 | check_dead_children(); |
848 | if (live_children >= max_connections) { | |
849 | close(incoming); | |
850 | logerror("Too many children, dropping connection"); | |
851 | return; | |
852 | } | |
853 | } | |
02d57da4 | 854 | |
f9c87be6 | 855 | if (addr->sa_family == AF_INET) { |
f063d38b | 856 | char buf[128] = ""; |
f9c87be6 | 857 | struct sockaddr_in *sin_addr = (void *) addr; |
f063d38b JK |
858 | inet_ntop(addr->sa_family, &sin_addr->sin_addr, buf, sizeof(buf)); |
859 | argv_array_pushf(&cld.env_array, "REMOTE_ADDR=%s", buf); | |
860 | argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d", | |
861 | ntohs(sin_addr->sin_port)); | |
f9c87be6 | 862 | #ifndef NO_IPV6 |
5d9cfa29 | 863 | } else if (addr->sa_family == AF_INET6) { |
f063d38b | 864 | char buf[128] = ""; |
f9c87be6 | 865 | struct sockaddr_in6 *sin6_addr = (void *) addr; |
f063d38b JK |
866 | inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(buf)); |
867 | argv_array_pushf(&cld.env_array, "REMOTE_ADDR=[%s]", buf); | |
868 | argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d", | |
869 | ntohs(sin6_addr->sin6_port)); | |
f9c87be6 EFL |
870 | #endif |
871 | } | |
872 | ||
850d2fec | 873 | cld.argv = cld_argv.argv; |
30e15602 EFL |
874 | cld.in = incoming; |
875 | cld.out = dup(incoming); | |
a87e8be2 | 876 | |
30e15602 EFL |
877 | if (start_command(&cld)) |
878 | logerror("unable to fork"); | |
879 | else | |
880 | add_child(&cld, addr, addrlen); | |
a87e8be2 LT |
881 | } |
882 | ||
eaa94919 LT |
883 | static void child_handler(int signo) |
884 | { | |
460c2010 JH |
885 | /* |
886 | * Otherwise empty handler because systemcalls will get interrupted | |
695605b5 SB |
887 | * upon signal receipt |
888 | * SysV needs the handler to be rearmed | |
889 | */ | |
bd7b371e | 890 | signal(SIGCHLD, child_handler); |
eaa94919 LT |
891 | } |
892 | ||
1955fabf MW |
893 | static int set_reuse_addr(int sockfd) |
894 | { | |
895 | int on = 1; | |
896 | ||
897 | if (!reuseaddr) | |
898 | return 0; | |
899 | return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, | |
900 | &on, sizeof(on)); | |
901 | } | |
902 | ||
2caa3215 AS |
903 | struct socketlist { |
904 | int *list; | |
905 | size_t nr; | |
906 | size_t alloc; | |
907 | }; | |
908 | ||
089d82e8 NTND |
909 | static const char *ip2str(int family, struct sockaddr *sin, socklen_t len) |
910 | { | |
911 | #ifdef NO_IPV6 | |
912 | static char ip[INET_ADDRSTRLEN]; | |
913 | #else | |
914 | static char ip[INET6_ADDRSTRLEN]; | |
915 | #endif | |
916 | ||
917 | switch (family) { | |
918 | #ifndef NO_IPV6 | |
919 | case AF_INET6: | |
920 | inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len); | |
921 | break; | |
922 | #endif | |
923 | case AF_INET: | |
924 | inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len); | |
925 | break; | |
926 | default: | |
5096d490 | 927 | xsnprintf(ip, sizeof(ip), "<unknown>"); |
089d82e8 NTND |
928 | } |
929 | return ip; | |
930 | } | |
931 | ||
6573faff PA |
932 | #ifndef NO_IPV6 |
933 | ||
2caa3215 | 934 | static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist) |
a87e8be2 | 935 | { |
2caa3215 | 936 | int socknum = 0; |
df076bdb | 937 | char pbuf[NI_MAXSERV]; |
6573faff PA |
938 | struct addrinfo hints, *ai0, *ai; |
939 | int gai; | |
20276889 | 940 | long flags; |
df076bdb | 941 | |
5096d490 | 942 | xsnprintf(pbuf, sizeof(pbuf), "%d", listen_port); |
df076bdb YH |
943 | memset(&hints, 0, sizeof(hints)); |
944 | hints.ai_family = AF_UNSPEC; | |
945 | hints.ai_socktype = SOCK_STREAM; | |
946 | hints.ai_protocol = IPPROTO_TCP; | |
947 | hints.ai_flags = AI_PASSIVE; | |
948 | ||
dd467629 | 949 | gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0); |
2caa3215 AS |
950 | if (gai) { |
951 | logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai)); | |
952 | return 0; | |
953 | } | |
df076bdb | 954 | |
df076bdb YH |
955 | for (ai = ai0; ai; ai = ai->ai_next) { |
956 | int sockfd; | |
df076bdb YH |
957 | |
958 | sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); | |
959 | if (sockfd < 0) | |
960 | continue; | |
961 | if (sockfd >= FD_SETSIZE) { | |
df0daf8a | 962 | logerror("Socket descriptor too large"); |
df076bdb YH |
963 | close(sockfd); |
964 | continue; | |
965 | } | |
966 | ||
967 | #ifdef IPV6_V6ONLY | |
968 | if (ai->ai_family == AF_INET6) { | |
969 | int on = 1; | |
970 | setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, | |
971 | &on, sizeof(on)); | |
972 | /* Note: error is not fatal */ | |
973 | } | |
974 | #endif | |
975 | ||
1955fabf | 976 | if (set_reuse_addr(sockfd)) { |
089d82e8 | 977 | logerror("Could not set SO_REUSEADDR: %s", strerror(errno)); |
1955fabf | 978 | close(sockfd); |
0032d548 | 979 | continue; |
1955fabf MW |
980 | } |
981 | ||
a43b68a1 EW |
982 | set_keep_alive(sockfd); |
983 | ||
df076bdb | 984 | if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) { |
089d82e8 NTND |
985 | logerror("Could not bind to %s: %s", |
986 | ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen), | |
987 | strerror(errno)); | |
df076bdb YH |
988 | close(sockfd); |
989 | continue; /* not fatal */ | |
990 | } | |
991 | if (listen(sockfd, 5) < 0) { | |
089d82e8 NTND |
992 | logerror("Could not listen to %s: %s", |
993 | ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen), | |
994 | strerror(errno)); | |
df076bdb YH |
995 | close(sockfd); |
996 | continue; /* not fatal */ | |
997 | } | |
998 | ||
20276889 AJ |
999 | flags = fcntl(sockfd, F_GETFD, 0); |
1000 | if (flags >= 0) | |
1001 | fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC); | |
1002 | ||
2caa3215 AS |
1003 | ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc); |
1004 | socklist->list[socklist->nr++] = sockfd; | |
1005 | socknum++; | |
df076bdb YH |
1006 | } |
1007 | ||
1008 | freeaddrinfo(ai0); | |
1009 | ||
6573faff PA |
1010 | return socknum; |
1011 | } | |
1012 | ||
1013 | #else /* NO_IPV6 */ | |
1014 | ||
2caa3215 | 1015 | static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist) |
6573faff PA |
1016 | { |
1017 | struct sockaddr_in sin; | |
1018 | int sockfd; | |
20276889 | 1019 | long flags; |
6573faff | 1020 | |
dd467629 JL |
1021 | memset(&sin, 0, sizeof sin); |
1022 | sin.sin_family = AF_INET; | |
1023 | sin.sin_port = htons(listen_port); | |
1024 | ||
1025 | if (listen_addr) { | |
1026 | /* Well, host better be an IP address here. */ | |
1027 | if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0) | |
1028 | return 0; | |
1029 | } else { | |
1030 | sin.sin_addr.s_addr = htonl(INADDR_ANY); | |
1031 | } | |
1032 | ||
6573faff PA |
1033 | sockfd = socket(AF_INET, SOCK_STREAM, 0); |
1034 | if (sockfd < 0) | |
1035 | return 0; | |
1036 | ||
1955fabf | 1037 | if (set_reuse_addr(sockfd)) { |
089d82e8 | 1038 | logerror("Could not set SO_REUSEADDR: %s", strerror(errno)); |
1955fabf MW |
1039 | close(sockfd); |
1040 | return 0; | |
1041 | } | |
1042 | ||
a43b68a1 EW |
1043 | set_keep_alive(sockfd); |
1044 | ||
6573faff | 1045 | if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) { |
9d1b9aa9 | 1046 | logerror("Could not bind to %s: %s", |
089d82e8 NTND |
1047 | ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)), |
1048 | strerror(errno)); | |
6573faff PA |
1049 | close(sockfd); |
1050 | return 0; | |
1051 | } | |
a87e8be2 | 1052 | |
f35230fb | 1053 | if (listen(sockfd, 5) < 0) { |
089d82e8 NTND |
1054 | logerror("Could not listen to %s: %s", |
1055 | ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)), | |
1056 | strerror(errno)); | |
f35230fb PS |
1057 | close(sockfd); |
1058 | return 0; | |
1059 | } | |
1060 | ||
20276889 AJ |
1061 | flags = fcntl(sockfd, F_GETFD, 0); |
1062 | if (flags >= 0) | |
1063 | fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC); | |
1064 | ||
2caa3215 AS |
1065 | ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc); |
1066 | socklist->list[socklist->nr++] = sockfd; | |
f35230fb | 1067 | return 1; |
6573faff PA |
1068 | } |
1069 | ||
1070 | #endif | |
1071 | ||
3a3a29c1 | 1072 | static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist) |
2caa3215 | 1073 | { |
3a3a29c1 AS |
1074 | if (!listen_addr->nr) |
1075 | setup_named_sock(NULL, listen_port, socklist); | |
1076 | else { | |
1077 | int i, socknum; | |
1078 | for (i = 0; i < listen_addr->nr; i++) { | |
1079 | socknum = setup_named_sock(listen_addr->items[i].string, | |
1080 | listen_port, socklist); | |
1081 | ||
1082 | if (socknum == 0) | |
1083 | logerror("unable to allocate any listen sockets for host %s on port %u", | |
1084 | listen_addr->items[i].string, listen_port); | |
1085 | } | |
1086 | } | |
2caa3215 AS |
1087 | } |
1088 | ||
1089 | static int service_loop(struct socketlist *socklist) | |
6573faff PA |
1090 | { |
1091 | struct pollfd *pfd; | |
1092 | int i; | |
1093 | ||
2caa3215 | 1094 | pfd = xcalloc(socklist->nr, sizeof(struct pollfd)); |
6573faff | 1095 | |
2caa3215 AS |
1096 | for (i = 0; i < socklist->nr; i++) { |
1097 | pfd[i].fd = socklist->list[i]; | |
6573faff PA |
1098 | pfd[i].events = POLLIN; |
1099 | } | |
9220282a PA |
1100 | |
1101 | signal(SIGCHLD, child_handler); | |
a87e8be2 LT |
1102 | |
1103 | for (;;) { | |
df076bdb | 1104 | int i; |
6573faff | 1105 | |
695605b5 SB |
1106 | check_dead_children(); |
1107 | ||
2caa3215 | 1108 | if (poll(pfd, socklist->nr, -1) < 0) { |
1eef0b33 | 1109 | if (errno != EINTR) { |
df0daf8a | 1110 | logerror("Poll failed, resuming: %s", |
1eef0b33 JH |
1111 | strerror(errno)); |
1112 | sleep(1); | |
1113 | } | |
df076bdb YH |
1114 | continue; |
1115 | } | |
1116 | ||
2caa3215 | 1117 | for (i = 0; i < socklist->nr; i++) { |
6573faff | 1118 | if (pfd[i].revents & POLLIN) { |
f9c87be6 EFL |
1119 | union { |
1120 | struct sockaddr sa; | |
1121 | struct sockaddr_in sai; | |
1122 | #ifndef NO_IPV6 | |
1123 | struct sockaddr_in6 sai6; | |
1124 | #endif | |
1125 | } ss; | |
c295cf06 | 1126 | socklen_t sslen = sizeof(ss); |
f9c87be6 | 1127 | int incoming = accept(pfd[i].fd, &ss.sa, &sslen); |
df076bdb YH |
1128 | if (incoming < 0) { |
1129 | switch (errno) { | |
1130 | case EAGAIN: | |
1131 | case EINTR: | |
1132 | case ECONNABORTED: | |
1133 | continue; | |
1134 | default: | |
d824cbba | 1135 | die_errno("accept returned"); |
df076bdb YH |
1136 | } |
1137 | } | |
f9c87be6 | 1138 | handle(incoming, &ss.sa, sslen); |
a87e8be2 LT |
1139 | } |
1140 | } | |
a87e8be2 LT |
1141 | } |
1142 | } | |
1143 | ||
a666b472 EFL |
1144 | #ifdef NO_POSIX_GOODIES |
1145 | ||
1146 | struct credentials; | |
1147 | ||
1148 | static void drop_privileges(struct credentials *cred) | |
1149 | { | |
1150 | /* nothing */ | |
1151 | } | |
1152 | ||
a666b472 EFL |
1153 | static struct credentials *prepare_credentials(const char *user_name, |
1154 | const char *group_name) | |
1155 | { | |
1156 | die("--user not supported on this platform"); | |
1157 | } | |
1158 | ||
1159 | #else | |
1160 | ||
1161 | struct credentials { | |
1162 | struct passwd *pass; | |
1163 | gid_t gid; | |
1164 | }; | |
1165 | ||
1166 | static void drop_privileges(struct credentials *cred) | |
1167 | { | |
1168 | if (cred && (initgroups(cred->pass->pw_name, cred->gid) || | |
1169 | setgid (cred->gid) || setuid(cred->pass->pw_uid))) | |
1170 | die("cannot drop privileges"); | |
1171 | } | |
1172 | ||
1173 | static struct credentials *prepare_credentials(const char *user_name, | |
1174 | const char *group_name) | |
1175 | { | |
1176 | static struct credentials c; | |
1177 | ||
1178 | c.pass = getpwnam(user_name); | |
1179 | if (!c.pass) | |
1180 | die("user not found - %s", user_name); | |
1181 | ||
1182 | if (!group_name) | |
1183 | c.gid = c.pass->pw_gid; | |
1184 | else { | |
1185 | struct group *group = getgrnam(group_name); | |
1186 | if (!group) | |
1187 | die("group not found - %s", group_name); | |
1188 | ||
1189 | c.gid = group->gr_gid; | |
1190 | } | |
1191 | ||
1192 | return &c; | |
1193 | } | |
a666b472 | 1194 | #endif |
a5262768 | 1195 | |
a666b472 EFL |
1196 | static int serve(struct string_list *listen_addr, int listen_port, |
1197 | struct credentials *cred) | |
6573faff | 1198 | { |
2caa3215 | 1199 | struct socketlist socklist = { NULL, 0, 0 }; |
4ae22d96 | 1200 | |
2caa3215 AS |
1201 | socksetup(listen_addr, listen_port, &socklist); |
1202 | if (socklist.nr == 0) | |
3a3a29c1 AS |
1203 | die("unable to allocate any listen sockets on port %u", |
1204 | listen_port); | |
4ae22d96 | 1205 | |
a666b472 | 1206 | drop_privileges(cred); |
678dac6b | 1207 | |
f6a34cfb CB |
1208 | loginfo("Ready to rumble"); |
1209 | ||
2caa3215 | 1210 | return service_loop(&socklist); |
4ae22d96 | 1211 | } |
6573faff | 1212 | |
3f2e2297 | 1213 | int cmd_main(int argc, const char **argv) |
a87e8be2 | 1214 | { |
dd467629 | 1215 | int listen_port = 0; |
3a3a29c1 | 1216 | struct string_list listen_addr = STRING_LIST_INIT_NODUP; |
30e15602 | 1217 | int serve_mode = 0, inetd_mode = 0; |
678dac6b | 1218 | const char *pid_file = NULL, *user_name = NULL, *group_name = NULL; |
a5262768 | 1219 | int detach = 0; |
a666b472 | 1220 | struct credentials *cred = NULL; |
a87e8be2 LT |
1221 | int i; |
1222 | ||
1223 | for (i = 1; i < argc; i++) { | |
3f2e2297 | 1224 | const char *arg = argv[i]; |
ae021d87 | 1225 | const char *v; |
a87e8be2 | 1226 | |
ae021d87 JK |
1227 | if (skip_prefix(arg, "--listen=", &v)) { |
1228 | string_list_append(&listen_addr, xstrdup_tolower(v)); | |
6720e95b | 1229 | continue; |
dd467629 | 1230 | } |
ae021d87 | 1231 | if (skip_prefix(arg, "--port=", &v)) { |
a87e8be2 LT |
1232 | char *end; |
1233 | unsigned long n; | |
ae021d87 JK |
1234 | n = strtoul(v, &end, 0); |
1235 | if (*v && !*end) { | |
dd467629 | 1236 | listen_port = n; |
a87e8be2 LT |
1237 | continue; |
1238 | } | |
1239 | } | |
30e15602 EFL |
1240 | if (!strcmp(arg, "--serve")) { |
1241 | serve_mode = 1; | |
1242 | continue; | |
1243 | } | |
e64e1b79 LT |
1244 | if (!strcmp(arg, "--inetd")) { |
1245 | inetd_mode = 1; | |
a8883288 | 1246 | log_syslog = 1; |
e64e1b79 LT |
1247 | continue; |
1248 | } | |
f8ff0c06 PB |
1249 | if (!strcmp(arg, "--verbose")) { |
1250 | verbose = 1; | |
1251 | continue; | |
1252 | } | |
9048fe1c PB |
1253 | if (!strcmp(arg, "--syslog")) { |
1254 | log_syslog = 1; | |
9048fe1c PB |
1255 | continue; |
1256 | } | |
4ae95682 PA |
1257 | if (!strcmp(arg, "--export-all")) { |
1258 | export_all_trees = 1; | |
1259 | continue; | |
1260 | } | |
ae021d87 JK |
1261 | if (skip_prefix(arg, "--access-hook=", &v)) { |
1262 | access_hook = v; | |
93741e4a JH |
1263 | continue; |
1264 | } | |
ae021d87 JK |
1265 | if (skip_prefix(arg, "--timeout=", &v)) { |
1266 | timeout = atoi(v); | |
a8883288 | 1267 | continue; |
960deccb | 1268 | } |
ae021d87 JK |
1269 | if (skip_prefix(arg, "--init-timeout=", &v)) { |
1270 | init_timeout = atoi(v); | |
a8883288 | 1271 | continue; |
960deccb | 1272 | } |
ae021d87 JK |
1273 | if (skip_prefix(arg, "--max-connections=", &v)) { |
1274 | max_connections = atoi(v); | |
3bd62c21 SB |
1275 | if (max_connections < 0) |
1276 | max_connections = 0; /* unlimited */ | |
1277 | continue; | |
1278 | } | |
4dbd1352 AE |
1279 | if (!strcmp(arg, "--strict-paths")) { |
1280 | strict_paths = 1; | |
1281 | continue; | |
1282 | } | |
ae021d87 JK |
1283 | if (skip_prefix(arg, "--base-path=", &v)) { |
1284 | base_path = v; | |
b21c31c9 PB |
1285 | continue; |
1286 | } | |
73a7a656 JA |
1287 | if (!strcmp(arg, "--base-path-relaxed")) { |
1288 | base_path_relaxed = 1; | |
1289 | continue; | |
1290 | } | |
ae021d87 JK |
1291 | if (skip_prefix(arg, "--interpolated-path=", &v)) { |
1292 | interpolated_path = v; | |
49ba83fb JL |
1293 | continue; |
1294 | } | |
1955fabf MW |
1295 | if (!strcmp(arg, "--reuseaddr")) { |
1296 | reuseaddr = 1; | |
1297 | continue; | |
1298 | } | |
603968d2 JH |
1299 | if (!strcmp(arg, "--user-path")) { |
1300 | user_path = ""; | |
1301 | continue; | |
1302 | } | |
ae021d87 JK |
1303 | if (skip_prefix(arg, "--user-path=", &v)) { |
1304 | user_path = v; | |
603968d2 JH |
1305 | continue; |
1306 | } | |
ae021d87 JK |
1307 | if (skip_prefix(arg, "--pid-file=", &v)) { |
1308 | pid_file = v; | |
45ed5d7f ML |
1309 | continue; |
1310 | } | |
a5262768 ML |
1311 | if (!strcmp(arg, "--detach")) { |
1312 | detach = 1; | |
1313 | log_syslog = 1; | |
1314 | continue; | |
1315 | } | |
ae021d87 JK |
1316 | if (skip_prefix(arg, "--user=", &v)) { |
1317 | user_name = v; | |
678dac6b TS |
1318 | continue; |
1319 | } | |
ae021d87 JK |
1320 | if (skip_prefix(arg, "--group=", &v)) { |
1321 | group_name = v; | |
678dac6b TS |
1322 | continue; |
1323 | } | |
ae021d87 JK |
1324 | if (skip_prefix(arg, "--enable=", &v)) { |
1325 | enable_service(v, 1); | |
d819e4e6 JH |
1326 | continue; |
1327 | } | |
ae021d87 JK |
1328 | if (skip_prefix(arg, "--disable=", &v)) { |
1329 | enable_service(v, 0); | |
d819e4e6 JH |
1330 | continue; |
1331 | } | |
ae021d87 JK |
1332 | if (skip_prefix(arg, "--allow-override=", &v)) { |
1333 | make_service_overridable(v, 1); | |
d819e4e6 JH |
1334 | continue; |
1335 | } | |
ae021d87 JK |
1336 | if (skip_prefix(arg, "--forbid-override=", &v)) { |
1337 | make_service_overridable(v, 0); | |
d819e4e6 JH |
1338 | continue; |
1339 | } | |
82246b76 | 1340 | if (!strcmp(arg, "--informative-errors")) { |
d5570f4d JK |
1341 | informative_errors = 1; |
1342 | continue; | |
1343 | } | |
82246b76 | 1344 | if (!strcmp(arg, "--no-informative-errors")) { |
d5570f4d JK |
1345 | informative_errors = 0; |
1346 | continue; | |
1347 | } | |
4ae95682 PA |
1348 | if (!strcmp(arg, "--")) { |
1349 | ok_paths = &argv[i+1]; | |
1350 | break; | |
1351 | } else if (arg[0] != '-') { | |
1352 | ok_paths = &argv[i]; | |
1353 | break; | |
1354 | } | |
e64e1b79 | 1355 | |
a87e8be2 LT |
1356 | usage(daemon_usage); |
1357 | } | |
1358 | ||
22665bba | 1359 | if (log_syslog) { |
6a992e9e | 1360 | openlog("git-daemon", LOG_PID, LOG_DAEMON); |
22665bba | 1361 | set_die_routine(daemon_die); |
460c2010 | 1362 | } else |
48196afd | 1363 | /* avoid splitting a message in the middle */ |
48cfaea1 | 1364 | setvbuf(stderr, NULL, _IOFBF, 4096); |
22665bba | 1365 | |
9cddf56e EFL |
1366 | if (inetd_mode && (detach || group_name || user_name)) |
1367 | die("--detach, --user and --group are incompatible with --inetd"); | |
678dac6b | 1368 | |
3a3a29c1 | 1369 | if (inetd_mode && (listen_port || (listen_addr.nr > 0))) |
dd467629 JL |
1370 | die("--listen= and --port= are incompatible with --inetd"); |
1371 | else if (listen_port == 0) | |
1372 | listen_port = DEFAULT_GIT_PORT; | |
1373 | ||
678dac6b TS |
1374 | if (group_name && !user_name) |
1375 | die("--group supplied without --user"); | |
1376 | ||
a666b472 EFL |
1377 | if (user_name) |
1378 | cred = prepare_credentials(user_name, group_name); | |
678dac6b | 1379 | |
ad8b4f56 ML |
1380 | if (strict_paths && (!ok_paths || !*ok_paths)) |
1381 | die("option --strict-paths requires a whitelist"); | |
1382 | ||
90b4a71c JH |
1383 | if (base_path && !is_directory(base_path)) |
1384 | die("base-path '%s' does not exist or is not a directory", | |
1385 | base_path); | |
20632071 | 1386 | |
7c3693f1 | 1387 | if (inetd_mode) { |
30e15602 EFL |
1388 | if (!freopen("/dev/null", "w", stderr)) |
1389 | die_errno("failed to redirect stderr to /dev/null"); | |
1390 | } | |
1391 | ||
f9c87be6 EFL |
1392 | if (inetd_mode || serve_mode) |
1393 | return execute(); | |
bce8230d | 1394 | |
de0957ce NTND |
1395 | if (detach) { |
1396 | if (daemonize()) | |
1397 | die("--detach not supported on this platform"); | |
57f5d52a | 1398 | } |
258e93a1 | 1399 | |
45ed5d7f | 1400 | if (pid_file) |
1f76a10b | 1401 | write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid()); |
45ed5d7f | 1402 | |
30e15602 | 1403 | /* prepare argv for serving-processes */ |
850d2fec JK |
1404 | argv_array_push(&cld_argv, argv[0]); /* git-daemon */ |
1405 | argv_array_push(&cld_argv, "--serve"); | |
081f84ee | 1406 | for (i = 1; i < argc; ++i) |
850d2fec | 1407 | argv_array_push(&cld_argv, argv[i]); |
30e15602 | 1408 | |
a666b472 | 1409 | return serve(&listen_addr, listen_port, cred); |
a87e8be2 | 1410 | } |