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Commit | Line | Data |
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979e32fa | 1 | #include "cache.h" |
b2141fc1 | 2 | #include "config.h" |
85023577 | 3 | #include "pkt-line.h" |
5d87dd4f JS |
4 | #include "run-command.h" |
5 | #include "strbuf.h" | |
3a3a29c1 | 6 | #include "string-list.h" |
f8ff0c06 | 7 | |
2844923d MD |
8 | #ifdef NO_INITGROUPS |
9 | #define initgroups(x, y) (0) /* nothing */ | |
10 | #endif | |
11 | ||
9048fe1c | 12 | static int log_syslog; |
f8ff0c06 | 13 | static int verbose; |
1955fabf | 14 | static int reuseaddr; |
d5570f4d | 15 | static int informative_errors; |
f8ff0c06 | 16 | |
960deccb | 17 | static const char daemon_usage[] = |
1b1dd23f | 18 | "git daemon [--verbose] [--syslog] [--export-all]\n" |
62b4698e ŠN |
19 | " [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n" |
20 | " [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n" | |
21 | " [--user-path | --user-path=<path>]\n" | |
22 | " [--interpolated-path=<path>]\n" | |
9cddf56e | 23 | " [--reuseaddr] [--pid-file=<file>]\n" |
62b4698e | 24 | " [--(enable|disable|allow-override|forbid-override)=<service>]\n" |
93741e4a | 25 | " [--access-hook=<path>]\n" |
62b4698e | 26 | " [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n" |
9cddf56e | 27 | " [--detach] [--user=<user> [--group=<group>]]\n" |
62b4698e | 28 | " [<directory>...]"; |
4ae95682 PA |
29 | |
30 | /* List of acceptable pathname prefixes */ | |
3f2e2297 | 31 | static const char **ok_paths; |
96f1e58f | 32 | static int strict_paths; |
4ae95682 PA |
33 | |
34 | /* If this is set, git-daemon-export-ok is not required */ | |
96f1e58f | 35 | static int export_all_trees; |
f8ff0c06 | 36 | |
b21c31c9 | 37 | /* Take all paths relative to this one if non-NULL */ |
1055a890 JK |
38 | static const char *base_path; |
39 | static const char *interpolated_path; | |
73a7a656 | 40 | static int base_path_relaxed; |
49ba83fb | 41 | |
603968d2 JH |
42 | /* If defined, ~user notation is allowed and the string is inserted |
43 | * after ~user/. E.g. a request to git://host/~alice/frotz would | |
44 | * go to /home/alice/pub_git/frotz with --user-path=pub_git. | |
45 | */ | |
96f1e58f | 46 | static const char *user_path; |
603968d2 | 47 | |
960deccb | 48 | /* Timeout, and initial timeout */ |
96f1e58f DR |
49 | static unsigned int timeout; |
50 | static unsigned int init_timeout; | |
f8ff0c06 | 51 | |
01cec54e RS |
52 | struct hostinfo { |
53 | struct strbuf hostname; | |
54 | struct strbuf canon_hostname; | |
55 | struct strbuf ip_address; | |
56 | struct strbuf tcp_port; | |
57 | unsigned int hostname_lookup_done:1; | |
58 | unsigned int saw_extended_args:1; | |
59 | }; | |
edef953e | 60 | |
01cec54e | 61 | static void lookup_hostname(struct hostinfo *hi); |
edef953e | 62 | |
01cec54e | 63 | static const char *get_canon_hostname(struct hostinfo *hi) |
edef953e | 64 | { |
01cec54e RS |
65 | lookup_hostname(hi); |
66 | return hi->canon_hostname.buf; | |
edef953e RS |
67 | } |
68 | ||
01cec54e | 69 | static const char *get_ip_address(struct hostinfo *hi) |
edef953e | 70 | { |
01cec54e RS |
71 | lookup_hostname(hi); |
72 | return hi->ip_address.buf; | |
edef953e RS |
73 | } |
74 | ||
9048fe1c | 75 | static void logreport(int priority, const char *err, va_list params) |
f8ff0c06 | 76 | { |
9048fe1c | 77 | if (log_syslog) { |
6a992e9e SB |
78 | char buf[1024]; |
79 | vsnprintf(buf, sizeof(buf), err, params); | |
9048fe1c | 80 | syslog(priority, "%s", buf); |
460c2010 JH |
81 | } else { |
82 | /* | |
48cfaea1 | 83 | * Since stderr is set to buffered mode, the |
6a992e9e | 84 | * logging of different processes will not overlap |
48cfaea1 | 85 | * unless they overflow the (rather big) buffers. |
6a992e9e | 86 | */ |
85e72830 | 87 | fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid()); |
6a992e9e SB |
88 | vfprintf(stderr, err, params); |
89 | fputc('\n', stderr); | |
48cfaea1 | 90 | fflush(stderr); |
6a992e9e | 91 | } |
f8ff0c06 PB |
92 | } |
93 | ||
28bea9e5 | 94 | __attribute__((format (printf, 1, 2))) |
cdda4745 | 95 | static void logerror(const char *err, ...) |
f8ff0c06 PB |
96 | { |
97 | va_list params; | |
98 | va_start(params, err); | |
9048fe1c | 99 | logreport(LOG_ERR, err, params); |
f8ff0c06 PB |
100 | va_end(params); |
101 | } | |
102 | ||
28bea9e5 | 103 | __attribute__((format (printf, 1, 2))) |
cdda4745 | 104 | static void loginfo(const char *err, ...) |
f8ff0c06 PB |
105 | { |
106 | va_list params; | |
107 | if (!verbose) | |
108 | return; | |
109 | va_start(params, err); | |
9048fe1c | 110 | logreport(LOG_INFO, err, params); |
f8ff0c06 PB |
111 | va_end(params); |
112 | } | |
a87e8be2 | 113 | |
ad8b4f56 ML |
114 | static void NORETURN daemon_die(const char *err, va_list params) |
115 | { | |
116 | logreport(LOG_ERR, err, params); | |
117 | exit(1); | |
118 | } | |
119 | ||
dc8edc8f RS |
120 | struct expand_path_context { |
121 | const char *directory; | |
01cec54e | 122 | struct hostinfo *hostinfo; |
dc8edc8f RS |
123 | }; |
124 | ||
125 | static size_t expand_path(struct strbuf *sb, const char *placeholder, void *ctx) | |
126 | { | |
127 | struct expand_path_context *context = ctx; | |
01cec54e | 128 | struct hostinfo *hi = context->hostinfo; |
dc8edc8f RS |
129 | |
130 | switch (placeholder[0]) { | |
131 | case 'H': | |
01cec54e | 132 | strbuf_addbuf(sb, &hi->hostname); |
dc8edc8f RS |
133 | return 1; |
134 | case 'C': | |
135 | if (placeholder[1] == 'H') { | |
01cec54e | 136 | strbuf_addstr(sb, get_canon_hostname(hi)); |
dc8edc8f RS |
137 | return 2; |
138 | } | |
139 | break; | |
140 | case 'I': | |
141 | if (placeholder[1] == 'P') { | |
01cec54e | 142 | strbuf_addstr(sb, get_ip_address(hi)); |
dc8edc8f RS |
143 | return 2; |
144 | } | |
145 | break; | |
146 | case 'P': | |
01cec54e | 147 | strbuf_addbuf(sb, &hi->tcp_port); |
dc8edc8f RS |
148 | return 1; |
149 | case 'D': | |
150 | strbuf_addstr(sb, context->directory); | |
151 | return 1; | |
152 | } | |
153 | return 0; | |
154 | } | |
155 | ||
01cec54e | 156 | static const char *path_ok(const char *directory, struct hostinfo *hi) |
4ae95682 | 157 | { |
603968d2 | 158 | static char rpath[PATH_MAX]; |
49ba83fb | 159 | static char interp_path[PATH_MAX]; |
6bdb0083 | 160 | size_t rlen; |
1c64b48e | 161 | const char *path; |
1055a890 | 162 | const char *dir; |
49ba83fb | 163 | |
9d7ca667 | 164 | dir = directory; |
d79374c7 | 165 | |
34b6cb8b | 166 | if (daemon_avoid_alias(dir)) { |
d79374c7 JH |
167 | logerror("'%s': aliased", dir); |
168 | return NULL; | |
169 | } | |
170 | ||
603968d2 JH |
171 | if (*dir == '~') { |
172 | if (!user_path) { | |
173 | logerror("'%s': User-path not allowed", dir); | |
174 | return NULL; | |
175 | } | |
176 | if (*user_path) { | |
177 | /* Got either "~alice" or "~alice/foo"; | |
178 | * rewrite them to "~alice/%s" or | |
179 | * "~alice/%s/foo". | |
180 | */ | |
181 | int namlen, restlen = strlen(dir); | |
1055a890 | 182 | const char *slash = strchr(dir, '/'); |
603968d2 JH |
183 | if (!slash) |
184 | slash = dir + restlen; | |
185 | namlen = slash - dir; | |
186 | restlen -= namlen; | |
187 | loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash); | |
6bdb0083 JK |
188 | rlen = snprintf(rpath, sizeof(rpath), "%.*s/%s%.*s", |
189 | namlen, dir, user_path, restlen, slash); | |
190 | if (rlen >= sizeof(rpath)) { | |
191 | logerror("user-path too large: %s", rpath); | |
192 | return NULL; | |
193 | } | |
603968d2 JH |
194 | dir = rpath; |
195 | } | |
196 | } | |
01cec54e | 197 | else if (interpolated_path && hi->saw_extended_args) { |
9d7ca667 | 198 | struct strbuf expanded_path = STRBUF_INIT; |
dc8edc8f RS |
199 | struct expand_path_context context; |
200 | ||
201 | context.directory = directory; | |
01cec54e | 202 | context.hostinfo = hi; |
dc8edc8f | 203 | |
49ba83fb JL |
204 | if (*dir != '/') { |
205 | /* Allow only absolute */ | |
206 | logerror("'%s': Non-absolute path denied (interpolated-path active)", dir); | |
207 | return NULL; | |
208 | } | |
209 | ||
9d7ca667 | 210 | strbuf_expand(&expanded_path, interpolated_path, |
dc8edc8f | 211 | expand_path, &context); |
6bdb0083 JK |
212 | |
213 | rlen = strlcpy(interp_path, expanded_path.buf, | |
214 | sizeof(interp_path)); | |
215 | if (rlen >= sizeof(interp_path)) { | |
216 | logerror("interpolated path too large: %s", | |
217 | interp_path); | |
218 | return NULL; | |
219 | } | |
220 | ||
9d7ca667 | 221 | strbuf_release(&expanded_path); |
49ba83fb JL |
222 | loginfo("Interpolated dir '%s'", interp_path); |
223 | ||
224 | dir = interp_path; | |
225 | } | |
603968d2 JH |
226 | else if (base_path) { |
227 | if (*dir != '/') { | |
228 | /* Allow only absolute */ | |
1fda3d55 | 229 | logerror("'%s': Non-absolute path denied (base-path active)", dir); |
b21c31c9 PB |
230 | return NULL; |
231 | } | |
6bdb0083 JK |
232 | rlen = snprintf(rpath, sizeof(rpath), "%s%s", base_path, dir); |
233 | if (rlen >= sizeof(rpath)) { | |
234 | logerror("base-path too large: %s", rpath); | |
235 | return NULL; | |
236 | } | |
49ba83fb | 237 | dir = rpath; |
b21c31c9 PB |
238 | } |
239 | ||
a583971f RS |
240 | path = enter_repo(dir, strict_paths); |
241 | if (!path && base_path && base_path_relaxed) { | |
73a7a656 JA |
242 | /* |
243 | * if we fail and base_path_relaxed is enabled, try without | |
244 | * prefixing the base path | |
245 | */ | |
a583971f RS |
246 | dir = directory; |
247 | path = enter_repo(dir, strict_paths); | |
248 | } | |
3e04c62d | 249 | |
4dbd1352 | 250 | if (!path) { |
05ac6b34 | 251 | logerror("'%s' does not appear to be a git repository", dir); |
4dbd1352 | 252 | return NULL; |
4ae95682 PA |
253 | } |
254 | ||
255 | if ( ok_paths && *ok_paths ) { | |
3f2e2297 | 256 | const char **pp; |
4dbd1352 | 257 | int pathlen = strlen(path); |
4ae95682 | 258 | |
ce335fe0 | 259 | /* The validation is done on the paths after enter_repo |
a6080a0a | 260 | * appends optional {.git,.git/.git} and friends, but |
d79374c7 JH |
261 | * it does not use getcwd(). So if your /pub is |
262 | * a symlink to /mnt/pub, you can whitelist /pub and | |
263 | * do not have to say /mnt/pub. | |
264 | * Do not say /pub/. | |
ce335fe0 | 265 | */ |
4ae95682 PA |
266 | for ( pp = ok_paths ; *pp ; pp++ ) { |
267 | int len = strlen(*pp); | |
ce335fe0 JH |
268 | if (len <= pathlen && |
269 | !memcmp(*pp, path, len) && | |
270 | (path[len] == '\0' || | |
271 | (!strict_paths && path[len] == '/'))) | |
272 | return path; | |
4ae95682 | 273 | } |
4dbd1352 AE |
274 | } |
275 | else { | |
276 | /* be backwards compatible */ | |
277 | if (!strict_paths) | |
278 | return path; | |
4ae95682 PA |
279 | } |
280 | ||
4dbd1352 AE |
281 | logerror("'%s': not in whitelist", path); |
282 | return NULL; /* Fallthrough. Deny by default */ | |
4ae95682 | 283 | } |
a87e8be2 | 284 | |
dfe422d0 | 285 | typedef int (*daemon_service_fn)(const struct argv_array *env); |
d819e4e6 JH |
286 | struct daemon_service { |
287 | const char *name; | |
288 | const char *config_name; | |
289 | daemon_service_fn fn; | |
290 | int enabled; | |
291 | int overridable; | |
292 | }; | |
293 | ||
d5570f4d JK |
294 | static int daemon_error(const char *dir, const char *msg) |
295 | { | |
296 | if (!informative_errors) | |
297 | msg = "access denied or repository not exported"; | |
81c634e9 | 298 | packet_write_fmt(1, "ERR %s: %s", msg, dir); |
d5570f4d JK |
299 | return -1; |
300 | } | |
301 | ||
1055a890 | 302 | static const char *access_hook; |
93741e4a | 303 | |
01cec54e RS |
304 | static int run_access_hook(struct daemon_service *service, const char *dir, |
305 | const char *path, struct hostinfo *hi) | |
93741e4a | 306 | { |
d3180279 | 307 | struct child_process child = CHILD_PROCESS_INIT; |
93741e4a JH |
308 | struct strbuf buf = STRBUF_INIT; |
309 | const char *argv[8]; | |
310 | const char **arg = argv; | |
311 | char *eol; | |
312 | int seen_errors = 0; | |
313 | ||
93741e4a JH |
314 | *arg++ = access_hook; |
315 | *arg++ = service->name; | |
316 | *arg++ = path; | |
01cec54e RS |
317 | *arg++ = hi->hostname.buf; |
318 | *arg++ = get_canon_hostname(hi); | |
319 | *arg++ = get_ip_address(hi); | |
320 | *arg++ = hi->tcp_port.buf; | |
93741e4a | 321 | *arg = NULL; |
93741e4a | 322 | |
93741e4a JH |
323 | child.use_shell = 1; |
324 | child.argv = argv; | |
325 | child.no_stdin = 1; | |
326 | child.no_stderr = 1; | |
327 | child.out = -1; | |
328 | if (start_command(&child)) { | |
329 | logerror("daemon access hook '%s' failed to start", | |
330 | access_hook); | |
331 | goto error_return; | |
332 | } | |
333 | if (strbuf_read(&buf, child.out, 0) < 0) { | |
334 | logerror("failed to read from pipe to daemon access hook '%s'", | |
335 | access_hook); | |
336 | strbuf_reset(&buf); | |
337 | seen_errors = 1; | |
338 | } | |
339 | if (close(child.out) < 0) { | |
340 | logerror("failed to close pipe to daemon access hook '%s'", | |
341 | access_hook); | |
342 | seen_errors = 1; | |
343 | } | |
344 | if (finish_command(&child)) | |
345 | seen_errors = 1; | |
346 | ||
347 | if (!seen_errors) { | |
348 | strbuf_release(&buf); | |
349 | return 0; | |
350 | } | |
351 | ||
352 | error_return: | |
353 | strbuf_ltrim(&buf); | |
354 | if (!buf.len) | |
355 | strbuf_addstr(&buf, "service rejected"); | |
356 | eol = strchr(buf.buf, '\n'); | |
357 | if (eol) | |
358 | *eol = '\0'; | |
359 | errno = EACCES; | |
360 | daemon_error(dir, buf.buf); | |
361 | strbuf_release(&buf); | |
362 | return -1; | |
363 | } | |
364 | ||
01cec54e | 365 | static int run_service(const char *dir, struct daemon_service *service, |
dfe422d0 | 366 | struct hostinfo *hi, const struct argv_array *env) |
a87e8be2 | 367 | { |
4dbd1352 | 368 | const char *path; |
d819e4e6 | 369 | int enabled = service->enabled; |
8939d32d | 370 | struct strbuf var = STRBUF_INIT; |
d819e4e6 | 371 | |
a47551c3 | 372 | loginfo("Request %s for '%s'", service->name, dir); |
4dbd1352 | 373 | |
d819e4e6 JH |
374 | if (!enabled && !service->overridable) { |
375 | logerror("'%s': service not enabled.", service->name); | |
376 | errno = EACCES; | |
d5570f4d | 377 | return daemon_error(dir, "service not enabled"); |
d819e4e6 | 378 | } |
4ae95682 | 379 | |
01cec54e | 380 | if (!(path = path_ok(dir, hi))) |
d5570f4d | 381 | return daemon_error(dir, "no such repository"); |
47888f0f | 382 | |
a87e8be2 LT |
383 | /* |
384 | * Security on the cheap. | |
385 | * | |
a935c397 | 386 | * We want a readable HEAD, usable "objects" directory, and |
a87e8be2 LT |
387 | * a "git-daemon-export-ok" flag that says that the other side |
388 | * is ok with us doing this. | |
4dbd1352 AE |
389 | * |
390 | * path_ok() uses enter_repo() and does whitelist checking. | |
391 | * We only need to make sure the repository is exported. | |
a87e8be2 | 392 | */ |
4dbd1352 | 393 | |
3e04c62d | 394 | if (!export_all_trees && access("git-daemon-export-ok", F_OK)) { |
4dbd1352 | 395 | logerror("'%s': repository not exported.", path); |
3e04c62d | 396 | errno = EACCES; |
d5570f4d | 397 | return daemon_error(dir, "repository not exported"); |
3e04c62d PA |
398 | } |
399 | ||
d819e4e6 | 400 | if (service->overridable) { |
8939d32d TA |
401 | strbuf_addf(&var, "daemon.%s", service->config_name); |
402 | git_config_get_bool(var.buf, &enabled); | |
403 | strbuf_release(&var); | |
d819e4e6 JH |
404 | } |
405 | if (!enabled) { | |
406 | logerror("'%s': service not enabled for '%s'", | |
407 | service->name, path); | |
408 | errno = EACCES; | |
d5570f4d | 409 | return daemon_error(dir, "service not enabled"); |
d819e4e6 JH |
410 | } |
411 | ||
93741e4a JH |
412 | /* |
413 | * Optionally, a hook can choose to deny access to the | |
414 | * repository depending on the phase of the moon. | |
415 | */ | |
01cec54e | 416 | if (access_hook && run_access_hook(service, dir, path, hi)) |
93741e4a JH |
417 | return -1; |
418 | ||
02d57da4 LT |
419 | /* |
420 | * We'll ignore SIGTERM from now on, we have a | |
421 | * good client. | |
422 | */ | |
423 | signal(SIGTERM, SIG_IGN); | |
424 | ||
dfe422d0 | 425 | return service->fn(env); |
d819e4e6 JH |
426 | } |
427 | ||
5d87dd4f JS |
428 | static void copy_to_log(int fd) |
429 | { | |
430 | struct strbuf line = STRBUF_INIT; | |
431 | FILE *fp; | |
432 | ||
433 | fp = fdopen(fd, "r"); | |
434 | if (fp == NULL) { | |
435 | logerror("fdopen of error channel failed"); | |
436 | close(fd); | |
437 | return; | |
438 | } | |
439 | ||
8f309aeb | 440 | while (strbuf_getline_lf(&line, fp) != EOF) { |
5d87dd4f JS |
441 | logerror("%s", line.buf); |
442 | strbuf_setlen(&line, 0); | |
443 | } | |
444 | ||
445 | strbuf_release(&line); | |
446 | fclose(fp); | |
447 | } | |
448 | ||
6a97da39 | 449 | static int run_service_command(struct child_process *cld) |
5d87dd4f | 450 | { |
6a97da39 JK |
451 | argv_array_push(&cld->args, "."); |
452 | cld->git_cmd = 1; | |
453 | cld->err = -1; | |
454 | if (start_command(cld)) | |
5d87dd4f JS |
455 | return -1; |
456 | ||
457 | close(0); | |
458 | close(1); | |
459 | ||
6a97da39 | 460 | copy_to_log(cld->err); |
5d87dd4f | 461 | |
6a97da39 | 462 | return finish_command(cld); |
5d87dd4f JS |
463 | } |
464 | ||
dfe422d0 | 465 | static int upload_pack(const struct argv_array *env) |
d819e4e6 | 466 | { |
6a97da39 JK |
467 | struct child_process cld = CHILD_PROCESS_INIT; |
468 | argv_array_pushl(&cld.args, "upload-pack", "--strict", NULL); | |
469 | argv_array_pushf(&cld.args, "--timeout=%u", timeout); | |
dfe422d0 BW |
470 | |
471 | argv_array_pushv(&cld.env_array, env->argv); | |
472 | ||
6a97da39 | 473 | return run_service_command(&cld); |
a87e8be2 LT |
474 | } |
475 | ||
dfe422d0 | 476 | static int upload_archive(const struct argv_array *env) |
39345a21 | 477 | { |
6a97da39 JK |
478 | struct child_process cld = CHILD_PROCESS_INIT; |
479 | argv_array_push(&cld.args, "upload-archive"); | |
dfe422d0 BW |
480 | |
481 | argv_array_pushv(&cld.env_array, env->argv); | |
482 | ||
6a97da39 | 483 | return run_service_command(&cld); |
39345a21 FBH |
484 | } |
485 | ||
dfe422d0 | 486 | static int receive_pack(const struct argv_array *env) |
4b3b1e1e | 487 | { |
6a97da39 JK |
488 | struct child_process cld = CHILD_PROCESS_INIT; |
489 | argv_array_push(&cld.args, "receive-pack"); | |
dfe422d0 BW |
490 | |
491 | argv_array_pushv(&cld.env_array, env->argv); | |
492 | ||
6a97da39 | 493 | return run_service_command(&cld); |
4b3b1e1e LT |
494 | } |
495 | ||
d819e4e6 | 496 | static struct daemon_service daemon_service[] = { |
39345a21 | 497 | { "upload-archive", "uploadarch", upload_archive, 0, 1 }, |
d819e4e6 | 498 | { "upload-pack", "uploadpack", upload_pack, 1, 1 }, |
4b3b1e1e | 499 | { "receive-pack", "receivepack", receive_pack, 0, 1 }, |
d819e4e6 JH |
500 | }; |
501 | ||
f3fa1838 JH |
502 | static void enable_service(const char *name, int ena) |
503 | { | |
d819e4e6 JH |
504 | int i; |
505 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { | |
506 | if (!strcmp(daemon_service[i].name, name)) { | |
507 | daemon_service[i].enabled = ena; | |
508 | return; | |
509 | } | |
510 | } | |
511 | die("No such service %s", name); | |
512 | } | |
513 | ||
f3fa1838 JH |
514 | static void make_service_overridable(const char *name, int ena) |
515 | { | |
d819e4e6 JH |
516 | int i; |
517 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { | |
518 | if (!strcmp(daemon_service[i].name, name)) { | |
519 | daemon_service[i].overridable = ena; | |
520 | return; | |
521 | } | |
522 | } | |
523 | die("No such service %s", name); | |
524 | } | |
525 | ||
e8dbd76d IL |
526 | static void parse_host_and_port(char *hostport, char **host, |
527 | char **port) | |
528 | { | |
529 | if (*hostport == '[') { | |
530 | char *end; | |
531 | ||
532 | end = strchr(hostport, ']'); | |
533 | if (!end) | |
9517e6b8 | 534 | die("Invalid request ('[' without ']')"); |
e8dbd76d IL |
535 | *end = '\0'; |
536 | *host = hostport + 1; | |
537 | if (!end[1]) | |
538 | *port = NULL; | |
539 | else if (end[1] == ':') | |
540 | *port = end + 2; | |
541 | else | |
542 | die("Garbage after end of host part"); | |
543 | } else { | |
544 | *host = hostport; | |
545 | *port = strrchr(hostport, ':'); | |
546 | if (*port) { | |
e9bd3235 | 547 | **port = '\0'; |
e8dbd76d IL |
548 | ++*port; |
549 | } | |
550 | } | |
551 | } | |
552 | ||
b4853730 JK |
553 | /* |
554 | * Sanitize a string from the client so that it's OK to be inserted into a | |
555 | * filesystem path. Specifically, we disallow slashes, runs of "..", and | |
556 | * trailing and leading dots, which means that the client cannot escape | |
557 | * our base path via ".." traversal. | |
558 | */ | |
7a646cec | 559 | static void sanitize_client(struct strbuf *out, const char *in) |
b4853730 JK |
560 | { |
561 | for (; *in; in++) { | |
562 | if (*in == '/') | |
563 | continue; | |
564 | if (*in == '.' && (!out->len || out->buf[out->len - 1] == '.')) | |
565 | continue; | |
566 | strbuf_addch(out, *in); | |
567 | } | |
568 | ||
569 | while (out->len && out->buf[out->len - 1] == '.') | |
570 | strbuf_setlen(out, out->len - 1); | |
571 | } | |
572 | ||
b4853730 JK |
573 | /* |
574 | * Like sanitize_client, but we also perform any canonicalization | |
575 | * to make life easier on the admin. | |
576 | */ | |
7a646cec | 577 | static void canonicalize_client(struct strbuf *out, const char *in) |
b4853730 | 578 | { |
7a646cec RS |
579 | sanitize_client(out, in); |
580 | strbuf_tolower(out); | |
b4853730 JK |
581 | } |
582 | ||
eb30aed7 | 583 | /* |
73bb33a9 | 584 | * Read the host as supplied by the client connection. |
dfe422d0 BW |
585 | * |
586 | * Returns a pointer to the character after the NUL byte terminating the host | |
587 | * arguemnt, or 'extra_args' if there is no host arguemnt. | |
eb30aed7 | 588 | */ |
dfe422d0 | 589 | static char *parse_host_arg(struct hostinfo *hi, char *extra_args, int buflen) |
49ba83fb JL |
590 | { |
591 | char *val; | |
592 | int vallen; | |
593 | char *end = extra_args + buflen; | |
594 | ||
73bb33a9 | 595 | if (extra_args < end && *extra_args) { |
01cec54e | 596 | hi->saw_extended_args = 1; |
49ba83fb JL |
597 | if (strncasecmp("host=", extra_args, 5) == 0) { |
598 | val = extra_args + 5; | |
599 | vallen = strlen(val) + 1; | |
600 | if (*val) { | |
eb30aed7 | 601 | /* Split <host>:<port> at colon. */ |
e8dbd76d IL |
602 | char *host; |
603 | char *port; | |
604 | parse_host_and_port(val, &host, &port); | |
01cec54e RS |
605 | if (port) |
606 | sanitize_client(&hi->tcp_port, port); | |
607 | canonicalize_client(&hi->hostname, host); | |
608 | hi->hostname_lookup_done = 0; | |
49ba83fb | 609 | } |
eb30aed7 | 610 | |
49ba83fb JL |
611 | /* On to the next one */ |
612 | extra_args = val + vallen; | |
613 | } | |
73bb33a9 SP |
614 | if (extra_args < end && *extra_args) |
615 | die("Invalid request"); | |
49ba83fb | 616 | } |
dfe422d0 BW |
617 | |
618 | return extra_args; | |
619 | } | |
620 | ||
621 | static void parse_extra_args(struct hostinfo *hi, struct argv_array *env, | |
622 | char *extra_args, int buflen) | |
623 | { | |
624 | const char *end = extra_args + buflen; | |
625 | struct strbuf git_protocol = STRBUF_INIT; | |
626 | ||
627 | /* First look for the host argument */ | |
628 | extra_args = parse_host_arg(hi, extra_args, buflen); | |
629 | ||
630 | /* Look for additional arguments places after a second NUL byte */ | |
631 | for (; extra_args < end; extra_args += strlen(extra_args) + 1) { | |
632 | const char *arg = extra_args; | |
633 | ||
634 | /* | |
635 | * Parse the extra arguments, adding most to 'git_protocol' | |
636 | * which will be used to set the 'GIT_PROTOCOL' envvar in the | |
637 | * service that will be run. | |
638 | * | |
639 | * If there ends up being a particular arg in the future that | |
640 | * git-daemon needs to parse specificly (like the 'host' arg) | |
641 | * then it can be parsed here and not added to 'git_protocol'. | |
642 | */ | |
643 | if (*arg) { | |
644 | if (git_protocol.len > 0) | |
645 | strbuf_addch(&git_protocol, ':'); | |
646 | strbuf_addstr(&git_protocol, arg); | |
647 | } | |
648 | } | |
649 | ||
650 | if (git_protocol.len > 0) | |
651 | argv_array_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=%s", | |
652 | git_protocol.buf); | |
653 | strbuf_release(&git_protocol); | |
edef953e | 654 | } |
dd467629 | 655 | |
edef953e RS |
656 | /* |
657 | * Locate canonical hostname and its IP address. | |
658 | */ | |
01cec54e | 659 | static void lookup_hostname(struct hostinfo *hi) |
edef953e | 660 | { |
01cec54e | 661 | if (!hi->hostname_lookup_done && hi->hostname.len) { |
dd467629 | 662 | #ifndef NO_IPV6 |
dd467629 | 663 | struct addrinfo hints; |
3e8a00ae | 664 | struct addrinfo *ai; |
dd467629 JL |
665 | int gai; |
666 | static char addrbuf[HOST_NAME_MAX + 1]; | |
667 | ||
668 | memset(&hints, 0, sizeof(hints)); | |
669 | hints.ai_flags = AI_CANONNAME; | |
670 | ||
01cec54e | 671 | gai = getaddrinfo(hi->hostname.buf, NULL, &hints, &ai); |
dd467629 | 672 | if (!gai) { |
3e8a00ae BK |
673 | struct sockaddr_in *sin_addr = (void *)ai->ai_addr; |
674 | ||
675 | inet_ntop(AF_INET, &sin_addr->sin_addr, | |
676 | addrbuf, sizeof(addrbuf)); | |
01cec54e | 677 | strbuf_addstr(&hi->ip_address, addrbuf); |
3e8a00ae | 678 | |
7a646cec | 679 | if (ai->ai_canonname) |
01cec54e | 680 | sanitize_client(&hi->canon_hostname, |
7a646cec RS |
681 | ai->ai_canonname); |
682 | else | |
01cec54e RS |
683 | strbuf_addbuf(&hi->canon_hostname, |
684 | &hi->ip_address); | |
3e8a00ae BK |
685 | |
686 | freeaddrinfo(ai); | |
dd467629 | 687 | } |
dd467629 | 688 | #else |
dd467629 JL |
689 | struct hostent *hent; |
690 | struct sockaddr_in sa; | |
691 | char **ap; | |
692 | static char addrbuf[HOST_NAME_MAX + 1]; | |
693 | ||
d358f771 | 694 | hent = gethostbyname(hi->hostname.buf); |
eb6c4035 RS |
695 | if (hent) { |
696 | ap = hent->h_addr_list; | |
697 | memset(&sa, 0, sizeof sa); | |
698 | sa.sin_family = hent->h_addrtype; | |
699 | sa.sin_port = htons(0); | |
700 | memcpy(&sa.sin_addr, *ap, hent->h_length); | |
701 | ||
702 | inet_ntop(hent->h_addrtype, &sa.sin_addr, | |
703 | addrbuf, sizeof(addrbuf)); | |
dd467629 | 704 | |
01cec54e RS |
705 | sanitize_client(&hi->canon_hostname, hent->h_name); |
706 | strbuf_addstr(&hi->ip_address, addrbuf); | |
eb6c4035 | 707 | } |
dd467629 | 708 | #endif |
01cec54e | 709 | hi->hostname_lookup_done = 1; |
6720e95b | 710 | } |
dd467629 JL |
711 | } |
712 | ||
01cec54e RS |
713 | static void hostinfo_init(struct hostinfo *hi) |
714 | { | |
715 | memset(hi, 0, sizeof(*hi)); | |
716 | strbuf_init(&hi->hostname, 0); | |
717 | strbuf_init(&hi->canon_hostname, 0); | |
718 | strbuf_init(&hi->ip_address, 0); | |
719 | strbuf_init(&hi->tcp_port, 0); | |
720 | } | |
721 | ||
722 | static void hostinfo_clear(struct hostinfo *hi) | |
723 | { | |
724 | strbuf_release(&hi->hostname); | |
725 | strbuf_release(&hi->canon_hostname); | |
726 | strbuf_release(&hi->ip_address); | |
727 | strbuf_release(&hi->tcp_port); | |
728 | } | |
dd467629 | 729 | |
a43b68a1 EW |
730 | static void set_keep_alive(int sockfd) |
731 | { | |
732 | int ka = 1; | |
733 | ||
49c58d86 EW |
734 | if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) { |
735 | if (errno != ENOTSOCK) | |
736 | logerror("unable to set SO_KEEPALIVE on socket: %s", | |
737 | strerror(errno)); | |
738 | } | |
a43b68a1 EW |
739 | } |
740 | ||
f9c87be6 | 741 | static int execute(void) |
a87e8be2 | 742 | { |
74543a04 | 743 | char *line = packet_buffer; |
d819e4e6 | 744 | int pktlen, len, i; |
f9c87be6 | 745 | char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT"); |
01cec54e | 746 | struct hostinfo hi; |
dfe422d0 | 747 | struct argv_array env = ARGV_ARRAY_INIT; |
01cec54e RS |
748 | |
749 | hostinfo_init(&hi); | |
7d80694a | 750 | |
f9c87be6 EFL |
751 | if (addr) |
752 | loginfo("Connection from %s:%s", addr, port); | |
5b276ee4 | 753 | |
a43b68a1 | 754 | set_keep_alive(0); |
960deccb | 755 | alarm(init_timeout ? init_timeout : timeout); |
4981fe75 | 756 | pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0); |
960deccb | 757 | alarm(0); |
7d80694a | 758 | |
5ad312be JL |
759 | len = strlen(line); |
760 | if (pktlen != len) | |
761 | loginfo("Extended attributes (%d bytes) exist <%.*s>", | |
762 | (int) pktlen - len, | |
763 | (int) pktlen - len, line + len + 1); | |
83543a24 | 764 | if (len && line[len-1] == '\n') { |
7d80694a | 765 | line[--len] = 0; |
83543a24 JH |
766 | pktlen--; |
767 | } | |
7d80694a | 768 | |
dfe422d0 | 769 | /* parse additional args hidden behind a NUL byte */ |
d433ed0b | 770 | if (len != pktlen) |
dfe422d0 | 771 | parse_extra_args(&hi, &env, line + len + 1, pktlen - len - 1); |
49ba83fb | 772 | |
d819e4e6 JH |
773 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { |
774 | struct daemon_service *s = &(daemon_service[i]); | |
d12c24d2 JK |
775 | const char *arg; |
776 | ||
777 | if (skip_prefix(line, "git-", &arg) && | |
778 | skip_prefix(arg, s->name, &arg) && | |
779 | *arg++ == ' ') { | |
eb30aed7 JL |
780 | /* |
781 | * Note: The directory here is probably context sensitive, | |
782 | * and might depend on the actual service being performed. | |
783 | */ | |
dfe422d0 | 784 | int rc = run_service(arg, s, &hi, &env); |
01cec54e | 785 | hostinfo_clear(&hi); |
dfe422d0 | 786 | argv_array_clear(&env); |
01cec54e | 787 | return rc; |
49ba83fb | 788 | } |
d819e4e6 | 789 | } |
a87e8be2 | 790 | |
01cec54e | 791 | hostinfo_clear(&hi); |
dfe422d0 | 792 | argv_array_clear(&env); |
f8ff0c06 | 793 | logerror("Protocol error: '%s'", line); |
a87e8be2 LT |
794 | return -1; |
795 | } | |
796 | ||
15515b73 EFL |
797 | static int addrcmp(const struct sockaddr_storage *s1, |
798 | const struct sockaddr_storage *s2) | |
799 | { | |
3aff874a BC |
800 | const struct sockaddr *sa1 = (const struct sockaddr*) s1; |
801 | const struct sockaddr *sa2 = (const struct sockaddr*) s2; | |
802 | ||
803 | if (sa1->sa_family != sa2->sa_family) | |
804 | return sa1->sa_family - sa2->sa_family; | |
805 | if (sa1->sa_family == AF_INET) | |
15515b73 EFL |
806 | return memcmp(&((struct sockaddr_in *)s1)->sin_addr, |
807 | &((struct sockaddr_in *)s2)->sin_addr, | |
808 | sizeof(struct in_addr)); | |
809 | #ifndef NO_IPV6 | |
3aff874a | 810 | if (sa1->sa_family == AF_INET6) |
15515b73 EFL |
811 | return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr, |
812 | &((struct sockaddr_in6 *)s2)->sin6_addr, | |
813 | sizeof(struct in6_addr)); | |
814 | #endif | |
815 | return 0; | |
816 | } | |
817 | ||
3bd62c21 | 818 | static int max_connections = 32; |
66e631de | 819 | |
3bd62c21 | 820 | static unsigned int live_children; |
66e631de | 821 | |
4d8fa916 | 822 | static struct child { |
3bd62c21 | 823 | struct child *next; |
30e15602 | 824 | struct child_process cld; |
df076bdb | 825 | struct sockaddr_storage address; |
3bd62c21 | 826 | } *firstborn; |
66e631de | 827 | |
c295cf06 | 828 | static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen) |
66e631de | 829 | { |
460c2010 JH |
830 | struct child *newborn, **cradle; |
831 | ||
460c2010 JH |
832 | newborn = xcalloc(1, sizeof(*newborn)); |
833 | live_children++; | |
30e15602 | 834 | memcpy(&newborn->cld, cld, sizeof(*cld)); |
460c2010 JH |
835 | memcpy(&newborn->address, addr, addrlen); |
836 | for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next) | |
15515b73 | 837 | if (!addrcmp(&(*cradle)->address, &newborn->address)) |
460c2010 JH |
838 | break; |
839 | newborn->next = *cradle; | |
840 | *cradle = newborn; | |
66e631de LT |
841 | } |
842 | ||
66e631de LT |
843 | /* |
844 | * This gets called if the number of connections grows | |
845 | * past "max_connections". | |
846 | * | |
3bd62c21 | 847 | * We kill the newest connection from a duplicate IP. |
66e631de | 848 | */ |
3bd62c21 | 849 | static void kill_some_child(void) |
66e631de | 850 | { |
460c2010 | 851 | const struct child *blanket, *next; |
66e631de | 852 | |
460c2010 JH |
853 | if (!(blanket = firstborn)) |
854 | return; | |
695605b5 | 855 | |
460c2010 | 856 | for (; (next = blanket->next); blanket = next) |
15515b73 | 857 | if (!addrcmp(&blanket->address, &next->address)) { |
30e15602 | 858 | kill(blanket->cld.pid, SIGTERM); |
460c2010 JH |
859 | break; |
860 | } | |
a5a9126b JS |
861 | } |
862 | ||
3bd62c21 | 863 | static void check_dead_children(void) |
a87e8be2 | 864 | { |
3bd62c21 SB |
865 | int status; |
866 | pid_t pid; | |
02d57da4 | 867 | |
30e15602 EFL |
868 | struct child **cradle, *blanket; |
869 | for (cradle = &firstborn; (blanket = *cradle);) | |
870 | if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) { | |
871 | const char *dead = ""; | |
872 | if (status) | |
873 | dead = " (with error)"; | |
874 | loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead); | |
875 | ||
876 | /* remove the child */ | |
877 | *cradle = blanket->next; | |
878 | live_children--; | |
b1b49ff8 | 879 | child_process_clear(&blanket->cld); |
30e15602 EFL |
880 | free(blanket); |
881 | } else | |
882 | cradle = &blanket->next; | |
02d57da4 LT |
883 | } |
884 | ||
850d2fec | 885 | static struct argv_array cld_argv = ARGV_ARRAY_INIT; |
c295cf06 | 886 | static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen) |
02d57da4 | 887 | { |
d3180279 | 888 | struct child_process cld = CHILD_PROCESS_INIT; |
02d57da4 | 889 | |
3bd62c21 SB |
890 | if (max_connections && live_children >= max_connections) { |
891 | kill_some_child(); | |
460c2010 | 892 | sleep(1); /* give it some time to die */ |
3bd62c21 SB |
893 | check_dead_children(); |
894 | if (live_children >= max_connections) { | |
895 | close(incoming); | |
896 | logerror("Too many children, dropping connection"); | |
897 | return; | |
898 | } | |
899 | } | |
02d57da4 | 900 | |
f9c87be6 | 901 | if (addr->sa_family == AF_INET) { |
f063d38b | 902 | char buf[128] = ""; |
f9c87be6 | 903 | struct sockaddr_in *sin_addr = (void *) addr; |
f063d38b JK |
904 | inet_ntop(addr->sa_family, &sin_addr->sin_addr, buf, sizeof(buf)); |
905 | argv_array_pushf(&cld.env_array, "REMOTE_ADDR=%s", buf); | |
906 | argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d", | |
907 | ntohs(sin_addr->sin_port)); | |
f9c87be6 | 908 | #ifndef NO_IPV6 |
5d9cfa29 | 909 | } else if (addr->sa_family == AF_INET6) { |
f063d38b | 910 | char buf[128] = ""; |
f9c87be6 | 911 | struct sockaddr_in6 *sin6_addr = (void *) addr; |
f063d38b JK |
912 | inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(buf)); |
913 | argv_array_pushf(&cld.env_array, "REMOTE_ADDR=[%s]", buf); | |
914 | argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d", | |
915 | ntohs(sin6_addr->sin6_port)); | |
f9c87be6 EFL |
916 | #endif |
917 | } | |
918 | ||
850d2fec | 919 | cld.argv = cld_argv.argv; |
30e15602 EFL |
920 | cld.in = incoming; |
921 | cld.out = dup(incoming); | |
a87e8be2 | 922 | |
30e15602 EFL |
923 | if (start_command(&cld)) |
924 | logerror("unable to fork"); | |
925 | else | |
926 | add_child(&cld, addr, addrlen); | |
a87e8be2 LT |
927 | } |
928 | ||
eaa94919 LT |
929 | static void child_handler(int signo) |
930 | { | |
460c2010 JH |
931 | /* |
932 | * Otherwise empty handler because systemcalls will get interrupted | |
695605b5 SB |
933 | * upon signal receipt |
934 | * SysV needs the handler to be rearmed | |
935 | */ | |
bd7b371e | 936 | signal(SIGCHLD, child_handler); |
eaa94919 LT |
937 | } |
938 | ||
1955fabf MW |
939 | static int set_reuse_addr(int sockfd) |
940 | { | |
941 | int on = 1; | |
942 | ||
943 | if (!reuseaddr) | |
944 | return 0; | |
945 | return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, | |
946 | &on, sizeof(on)); | |
947 | } | |
948 | ||
2caa3215 AS |
949 | struct socketlist { |
950 | int *list; | |
951 | size_t nr; | |
952 | size_t alloc; | |
953 | }; | |
954 | ||
089d82e8 NTND |
955 | static const char *ip2str(int family, struct sockaddr *sin, socklen_t len) |
956 | { | |
957 | #ifdef NO_IPV6 | |
958 | static char ip[INET_ADDRSTRLEN]; | |
959 | #else | |
960 | static char ip[INET6_ADDRSTRLEN]; | |
961 | #endif | |
962 | ||
963 | switch (family) { | |
964 | #ifndef NO_IPV6 | |
965 | case AF_INET6: | |
966 | inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len); | |
967 | break; | |
968 | #endif | |
969 | case AF_INET: | |
970 | inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len); | |
971 | break; | |
972 | default: | |
5096d490 | 973 | xsnprintf(ip, sizeof(ip), "<unknown>"); |
089d82e8 NTND |
974 | } |
975 | return ip; | |
976 | } | |
977 | ||
6573faff PA |
978 | #ifndef NO_IPV6 |
979 | ||
2caa3215 | 980 | static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist) |
a87e8be2 | 981 | { |
2caa3215 | 982 | int socknum = 0; |
df076bdb | 983 | char pbuf[NI_MAXSERV]; |
6573faff PA |
984 | struct addrinfo hints, *ai0, *ai; |
985 | int gai; | |
20276889 | 986 | long flags; |
df076bdb | 987 | |
5096d490 | 988 | xsnprintf(pbuf, sizeof(pbuf), "%d", listen_port); |
df076bdb YH |
989 | memset(&hints, 0, sizeof(hints)); |
990 | hints.ai_family = AF_UNSPEC; | |
991 | hints.ai_socktype = SOCK_STREAM; | |
992 | hints.ai_protocol = IPPROTO_TCP; | |
993 | hints.ai_flags = AI_PASSIVE; | |
994 | ||
dd467629 | 995 | gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0); |
2caa3215 AS |
996 | if (gai) { |
997 | logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai)); | |
998 | return 0; | |
999 | } | |
df076bdb | 1000 | |
df076bdb YH |
1001 | for (ai = ai0; ai; ai = ai->ai_next) { |
1002 | int sockfd; | |
df076bdb YH |
1003 | |
1004 | sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); | |
1005 | if (sockfd < 0) | |
1006 | continue; | |
1007 | if (sockfd >= FD_SETSIZE) { | |
df0daf8a | 1008 | logerror("Socket descriptor too large"); |
df076bdb YH |
1009 | close(sockfd); |
1010 | continue; | |
1011 | } | |
1012 | ||
1013 | #ifdef IPV6_V6ONLY | |
1014 | if (ai->ai_family == AF_INET6) { | |
1015 | int on = 1; | |
1016 | setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, | |
1017 | &on, sizeof(on)); | |
1018 | /* Note: error is not fatal */ | |
1019 | } | |
1020 | #endif | |
1021 | ||
1955fabf | 1022 | if (set_reuse_addr(sockfd)) { |
089d82e8 | 1023 | logerror("Could not set SO_REUSEADDR: %s", strerror(errno)); |
1955fabf | 1024 | close(sockfd); |
0032d548 | 1025 | continue; |
1955fabf MW |
1026 | } |
1027 | ||
a43b68a1 EW |
1028 | set_keep_alive(sockfd); |
1029 | ||
df076bdb | 1030 | if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) { |
089d82e8 NTND |
1031 | logerror("Could not bind to %s: %s", |
1032 | ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen), | |
1033 | strerror(errno)); | |
df076bdb YH |
1034 | close(sockfd); |
1035 | continue; /* not fatal */ | |
1036 | } | |
1037 | if (listen(sockfd, 5) < 0) { | |
089d82e8 NTND |
1038 | logerror("Could not listen to %s: %s", |
1039 | ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen), | |
1040 | strerror(errno)); | |
df076bdb YH |
1041 | close(sockfd); |
1042 | continue; /* not fatal */ | |
1043 | } | |
1044 | ||
20276889 AJ |
1045 | flags = fcntl(sockfd, F_GETFD, 0); |
1046 | if (flags >= 0) | |
1047 | fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC); | |
1048 | ||
2caa3215 AS |
1049 | ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc); |
1050 | socklist->list[socklist->nr++] = sockfd; | |
1051 | socknum++; | |
df076bdb YH |
1052 | } |
1053 | ||
1054 | freeaddrinfo(ai0); | |
1055 | ||
6573faff PA |
1056 | return socknum; |
1057 | } | |
1058 | ||
1059 | #else /* NO_IPV6 */ | |
1060 | ||
2caa3215 | 1061 | static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist) |
6573faff PA |
1062 | { |
1063 | struct sockaddr_in sin; | |
1064 | int sockfd; | |
20276889 | 1065 | long flags; |
6573faff | 1066 | |
dd467629 JL |
1067 | memset(&sin, 0, sizeof sin); |
1068 | sin.sin_family = AF_INET; | |
1069 | sin.sin_port = htons(listen_port); | |
1070 | ||
1071 | if (listen_addr) { | |
1072 | /* Well, host better be an IP address here. */ | |
1073 | if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0) | |
1074 | return 0; | |
1075 | } else { | |
1076 | sin.sin_addr.s_addr = htonl(INADDR_ANY); | |
1077 | } | |
1078 | ||
6573faff PA |
1079 | sockfd = socket(AF_INET, SOCK_STREAM, 0); |
1080 | if (sockfd < 0) | |
1081 | return 0; | |
1082 | ||
1955fabf | 1083 | if (set_reuse_addr(sockfd)) { |
089d82e8 | 1084 | logerror("Could not set SO_REUSEADDR: %s", strerror(errno)); |
1955fabf MW |
1085 | close(sockfd); |
1086 | return 0; | |
1087 | } | |
1088 | ||
a43b68a1 EW |
1089 | set_keep_alive(sockfd); |
1090 | ||
6573faff | 1091 | if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) { |
9d1b9aa9 | 1092 | logerror("Could not bind to %s: %s", |
089d82e8 NTND |
1093 | ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)), |
1094 | strerror(errno)); | |
6573faff PA |
1095 | close(sockfd); |
1096 | return 0; | |
1097 | } | |
a87e8be2 | 1098 | |
f35230fb | 1099 | if (listen(sockfd, 5) < 0) { |
089d82e8 NTND |
1100 | logerror("Could not listen to %s: %s", |
1101 | ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)), | |
1102 | strerror(errno)); | |
f35230fb PS |
1103 | close(sockfd); |
1104 | return 0; | |
1105 | } | |
1106 | ||
20276889 AJ |
1107 | flags = fcntl(sockfd, F_GETFD, 0); |
1108 | if (flags >= 0) | |
1109 | fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC); | |
1110 | ||
2caa3215 AS |
1111 | ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc); |
1112 | socklist->list[socklist->nr++] = sockfd; | |
f35230fb | 1113 | return 1; |
6573faff PA |
1114 | } |
1115 | ||
1116 | #endif | |
1117 | ||
3a3a29c1 | 1118 | static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist) |
2caa3215 | 1119 | { |
3a3a29c1 AS |
1120 | if (!listen_addr->nr) |
1121 | setup_named_sock(NULL, listen_port, socklist); | |
1122 | else { | |
1123 | int i, socknum; | |
1124 | for (i = 0; i < listen_addr->nr; i++) { | |
1125 | socknum = setup_named_sock(listen_addr->items[i].string, | |
1126 | listen_port, socklist); | |
1127 | ||
1128 | if (socknum == 0) | |
1129 | logerror("unable to allocate any listen sockets for host %s on port %u", | |
1130 | listen_addr->items[i].string, listen_port); | |
1131 | } | |
1132 | } | |
2caa3215 AS |
1133 | } |
1134 | ||
1135 | static int service_loop(struct socketlist *socklist) | |
6573faff PA |
1136 | { |
1137 | struct pollfd *pfd; | |
1138 | int i; | |
1139 | ||
2caa3215 | 1140 | pfd = xcalloc(socklist->nr, sizeof(struct pollfd)); |
6573faff | 1141 | |
2caa3215 AS |
1142 | for (i = 0; i < socklist->nr; i++) { |
1143 | pfd[i].fd = socklist->list[i]; | |
6573faff PA |
1144 | pfd[i].events = POLLIN; |
1145 | } | |
9220282a PA |
1146 | |
1147 | signal(SIGCHLD, child_handler); | |
a87e8be2 LT |
1148 | |
1149 | for (;;) { | |
df076bdb | 1150 | int i; |
6573faff | 1151 | |
695605b5 SB |
1152 | check_dead_children(); |
1153 | ||
2caa3215 | 1154 | if (poll(pfd, socklist->nr, -1) < 0) { |
1eef0b33 | 1155 | if (errno != EINTR) { |
df0daf8a | 1156 | logerror("Poll failed, resuming: %s", |
1eef0b33 JH |
1157 | strerror(errno)); |
1158 | sleep(1); | |
1159 | } | |
df076bdb YH |
1160 | continue; |
1161 | } | |
1162 | ||
2caa3215 | 1163 | for (i = 0; i < socklist->nr; i++) { |
6573faff | 1164 | if (pfd[i].revents & POLLIN) { |
f9c87be6 EFL |
1165 | union { |
1166 | struct sockaddr sa; | |
1167 | struct sockaddr_in sai; | |
1168 | #ifndef NO_IPV6 | |
1169 | struct sockaddr_in6 sai6; | |
1170 | #endif | |
1171 | } ss; | |
c295cf06 | 1172 | socklen_t sslen = sizeof(ss); |
f9c87be6 | 1173 | int incoming = accept(pfd[i].fd, &ss.sa, &sslen); |
df076bdb YH |
1174 | if (incoming < 0) { |
1175 | switch (errno) { | |
1176 | case EAGAIN: | |
1177 | case EINTR: | |
1178 | case ECONNABORTED: | |
1179 | continue; | |
1180 | default: | |
d824cbba | 1181 | die_errno("accept returned"); |
df076bdb YH |
1182 | } |
1183 | } | |
f9c87be6 | 1184 | handle(incoming, &ss.sa, sslen); |
a87e8be2 LT |
1185 | } |
1186 | } | |
a87e8be2 LT |
1187 | } |
1188 | } | |
1189 | ||
a666b472 EFL |
1190 | #ifdef NO_POSIX_GOODIES |
1191 | ||
1192 | struct credentials; | |
1193 | ||
1194 | static void drop_privileges(struct credentials *cred) | |
1195 | { | |
1196 | /* nothing */ | |
1197 | } | |
1198 | ||
a666b472 EFL |
1199 | static struct credentials *prepare_credentials(const char *user_name, |
1200 | const char *group_name) | |
1201 | { | |
1202 | die("--user not supported on this platform"); | |
1203 | } | |
1204 | ||
1205 | #else | |
1206 | ||
1207 | struct credentials { | |
1208 | struct passwd *pass; | |
1209 | gid_t gid; | |
1210 | }; | |
1211 | ||
1212 | static void drop_privileges(struct credentials *cred) | |
1213 | { | |
1214 | if (cred && (initgroups(cred->pass->pw_name, cred->gid) || | |
1215 | setgid (cred->gid) || setuid(cred->pass->pw_uid))) | |
1216 | die("cannot drop privileges"); | |
1217 | } | |
1218 | ||
1219 | static struct credentials *prepare_credentials(const char *user_name, | |
1220 | const char *group_name) | |
1221 | { | |
1222 | static struct credentials c; | |
1223 | ||
1224 | c.pass = getpwnam(user_name); | |
1225 | if (!c.pass) | |
1226 | die("user not found - %s", user_name); | |
1227 | ||
1228 | if (!group_name) | |
1229 | c.gid = c.pass->pw_gid; | |
1230 | else { | |
1231 | struct group *group = getgrnam(group_name); | |
1232 | if (!group) | |
1233 | die("group not found - %s", group_name); | |
1234 | ||
1235 | c.gid = group->gr_gid; | |
1236 | } | |
1237 | ||
1238 | return &c; | |
1239 | } | |
a666b472 | 1240 | #endif |
a5262768 | 1241 | |
a666b472 EFL |
1242 | static int serve(struct string_list *listen_addr, int listen_port, |
1243 | struct credentials *cred) | |
6573faff | 1244 | { |
2caa3215 | 1245 | struct socketlist socklist = { NULL, 0, 0 }; |
4ae22d96 | 1246 | |
2caa3215 AS |
1247 | socksetup(listen_addr, listen_port, &socklist); |
1248 | if (socklist.nr == 0) | |
3a3a29c1 AS |
1249 | die("unable to allocate any listen sockets on port %u", |
1250 | listen_port); | |
4ae22d96 | 1251 | |
a666b472 | 1252 | drop_privileges(cred); |
678dac6b | 1253 | |
f6a34cfb CB |
1254 | loginfo("Ready to rumble"); |
1255 | ||
2caa3215 | 1256 | return service_loop(&socklist); |
4ae22d96 | 1257 | } |
6573faff | 1258 | |
3f2e2297 | 1259 | int cmd_main(int argc, const char **argv) |
a87e8be2 | 1260 | { |
dd467629 | 1261 | int listen_port = 0; |
3a3a29c1 | 1262 | struct string_list listen_addr = STRING_LIST_INIT_NODUP; |
30e15602 | 1263 | int serve_mode = 0, inetd_mode = 0; |
678dac6b | 1264 | const char *pid_file = NULL, *user_name = NULL, *group_name = NULL; |
a5262768 | 1265 | int detach = 0; |
a666b472 | 1266 | struct credentials *cred = NULL; |
a87e8be2 LT |
1267 | int i; |
1268 | ||
1269 | for (i = 1; i < argc; i++) { | |
3f2e2297 | 1270 | const char *arg = argv[i]; |
ae021d87 | 1271 | const char *v; |
a87e8be2 | 1272 | |
ae021d87 JK |
1273 | if (skip_prefix(arg, "--listen=", &v)) { |
1274 | string_list_append(&listen_addr, xstrdup_tolower(v)); | |
6720e95b | 1275 | continue; |
dd467629 | 1276 | } |
ae021d87 | 1277 | if (skip_prefix(arg, "--port=", &v)) { |
a87e8be2 LT |
1278 | char *end; |
1279 | unsigned long n; | |
ae021d87 JK |
1280 | n = strtoul(v, &end, 0); |
1281 | if (*v && !*end) { | |
dd467629 | 1282 | listen_port = n; |
a87e8be2 LT |
1283 | continue; |
1284 | } | |
1285 | } | |
30e15602 EFL |
1286 | if (!strcmp(arg, "--serve")) { |
1287 | serve_mode = 1; | |
1288 | continue; | |
1289 | } | |
e64e1b79 LT |
1290 | if (!strcmp(arg, "--inetd")) { |
1291 | inetd_mode = 1; | |
a8883288 | 1292 | log_syslog = 1; |
e64e1b79 LT |
1293 | continue; |
1294 | } | |
f8ff0c06 PB |
1295 | if (!strcmp(arg, "--verbose")) { |
1296 | verbose = 1; | |
1297 | continue; | |
1298 | } | |
9048fe1c PB |
1299 | if (!strcmp(arg, "--syslog")) { |
1300 | log_syslog = 1; | |
9048fe1c PB |
1301 | continue; |
1302 | } | |
4ae95682 PA |
1303 | if (!strcmp(arg, "--export-all")) { |
1304 | export_all_trees = 1; | |
1305 | continue; | |
1306 | } | |
ae021d87 JK |
1307 | if (skip_prefix(arg, "--access-hook=", &v)) { |
1308 | access_hook = v; | |
93741e4a JH |
1309 | continue; |
1310 | } | |
ae021d87 JK |
1311 | if (skip_prefix(arg, "--timeout=", &v)) { |
1312 | timeout = atoi(v); | |
a8883288 | 1313 | continue; |
960deccb | 1314 | } |
ae021d87 JK |
1315 | if (skip_prefix(arg, "--init-timeout=", &v)) { |
1316 | init_timeout = atoi(v); | |
a8883288 | 1317 | continue; |
960deccb | 1318 | } |
ae021d87 JK |
1319 | if (skip_prefix(arg, "--max-connections=", &v)) { |
1320 | max_connections = atoi(v); | |
3bd62c21 SB |
1321 | if (max_connections < 0) |
1322 | max_connections = 0; /* unlimited */ | |
1323 | continue; | |
1324 | } | |
4dbd1352 AE |
1325 | if (!strcmp(arg, "--strict-paths")) { |
1326 | strict_paths = 1; | |
1327 | continue; | |
1328 | } | |
ae021d87 JK |
1329 | if (skip_prefix(arg, "--base-path=", &v)) { |
1330 | base_path = v; | |
b21c31c9 PB |
1331 | continue; |
1332 | } | |
73a7a656 JA |
1333 | if (!strcmp(arg, "--base-path-relaxed")) { |
1334 | base_path_relaxed = 1; | |
1335 | continue; | |
1336 | } | |
ae021d87 JK |
1337 | if (skip_prefix(arg, "--interpolated-path=", &v)) { |
1338 | interpolated_path = v; | |
49ba83fb JL |
1339 | continue; |
1340 | } | |
1955fabf MW |
1341 | if (!strcmp(arg, "--reuseaddr")) { |
1342 | reuseaddr = 1; | |
1343 | continue; | |
1344 | } | |
603968d2 JH |
1345 | if (!strcmp(arg, "--user-path")) { |
1346 | user_path = ""; | |
1347 | continue; | |
1348 | } | |
ae021d87 JK |
1349 | if (skip_prefix(arg, "--user-path=", &v)) { |
1350 | user_path = v; | |
603968d2 JH |
1351 | continue; |
1352 | } | |
ae021d87 JK |
1353 | if (skip_prefix(arg, "--pid-file=", &v)) { |
1354 | pid_file = v; | |
45ed5d7f ML |
1355 | continue; |
1356 | } | |
a5262768 ML |
1357 | if (!strcmp(arg, "--detach")) { |
1358 | detach = 1; | |
1359 | log_syslog = 1; | |
1360 | continue; | |
1361 | } | |
ae021d87 JK |
1362 | if (skip_prefix(arg, "--user=", &v)) { |
1363 | user_name = v; | |
678dac6b TS |
1364 | continue; |
1365 | } | |
ae021d87 JK |
1366 | if (skip_prefix(arg, "--group=", &v)) { |
1367 | group_name = v; | |
678dac6b TS |
1368 | continue; |
1369 | } | |
ae021d87 JK |
1370 | if (skip_prefix(arg, "--enable=", &v)) { |
1371 | enable_service(v, 1); | |
d819e4e6 JH |
1372 | continue; |
1373 | } | |
ae021d87 JK |
1374 | if (skip_prefix(arg, "--disable=", &v)) { |
1375 | enable_service(v, 0); | |
d819e4e6 JH |
1376 | continue; |
1377 | } | |
ae021d87 JK |
1378 | if (skip_prefix(arg, "--allow-override=", &v)) { |
1379 | make_service_overridable(v, 1); | |
d819e4e6 JH |
1380 | continue; |
1381 | } | |
ae021d87 JK |
1382 | if (skip_prefix(arg, "--forbid-override=", &v)) { |
1383 | make_service_overridable(v, 0); | |
d819e4e6 JH |
1384 | continue; |
1385 | } | |
82246b76 | 1386 | if (!strcmp(arg, "--informative-errors")) { |
d5570f4d JK |
1387 | informative_errors = 1; |
1388 | continue; | |
1389 | } | |
82246b76 | 1390 | if (!strcmp(arg, "--no-informative-errors")) { |
d5570f4d JK |
1391 | informative_errors = 0; |
1392 | continue; | |
1393 | } | |
4ae95682 PA |
1394 | if (!strcmp(arg, "--")) { |
1395 | ok_paths = &argv[i+1]; | |
1396 | break; | |
1397 | } else if (arg[0] != '-') { | |
1398 | ok_paths = &argv[i]; | |
1399 | break; | |
1400 | } | |
e64e1b79 | 1401 | |
a87e8be2 LT |
1402 | usage(daemon_usage); |
1403 | } | |
1404 | ||
22665bba | 1405 | if (log_syslog) { |
6a992e9e | 1406 | openlog("git-daemon", LOG_PID, LOG_DAEMON); |
22665bba | 1407 | set_die_routine(daemon_die); |
460c2010 | 1408 | } else |
48196afd | 1409 | /* avoid splitting a message in the middle */ |
48cfaea1 | 1410 | setvbuf(stderr, NULL, _IOFBF, 4096); |
22665bba | 1411 | |
9cddf56e EFL |
1412 | if (inetd_mode && (detach || group_name || user_name)) |
1413 | die("--detach, --user and --group are incompatible with --inetd"); | |
678dac6b | 1414 | |
3a3a29c1 | 1415 | if (inetd_mode && (listen_port || (listen_addr.nr > 0))) |
dd467629 JL |
1416 | die("--listen= and --port= are incompatible with --inetd"); |
1417 | else if (listen_port == 0) | |
1418 | listen_port = DEFAULT_GIT_PORT; | |
1419 | ||
678dac6b TS |
1420 | if (group_name && !user_name) |
1421 | die("--group supplied without --user"); | |
1422 | ||
a666b472 EFL |
1423 | if (user_name) |
1424 | cred = prepare_credentials(user_name, group_name); | |
678dac6b | 1425 | |
ad8b4f56 ML |
1426 | if (strict_paths && (!ok_paths || !*ok_paths)) |
1427 | die("option --strict-paths requires a whitelist"); | |
1428 | ||
90b4a71c JH |
1429 | if (base_path && !is_directory(base_path)) |
1430 | die("base-path '%s' does not exist or is not a directory", | |
1431 | base_path); | |
20632071 | 1432 | |
7c3693f1 | 1433 | if (inetd_mode) { |
30e15602 EFL |
1434 | if (!freopen("/dev/null", "w", stderr)) |
1435 | die_errno("failed to redirect stderr to /dev/null"); | |
1436 | } | |
1437 | ||
f9c87be6 EFL |
1438 | if (inetd_mode || serve_mode) |
1439 | return execute(); | |
bce8230d | 1440 | |
de0957ce NTND |
1441 | if (detach) { |
1442 | if (daemonize()) | |
1443 | die("--detach not supported on this platform"); | |
57f5d52a | 1444 | } |
258e93a1 | 1445 | |
45ed5d7f | 1446 | if (pid_file) |
1f76a10b | 1447 | write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid()); |
45ed5d7f | 1448 | |
30e15602 | 1449 | /* prepare argv for serving-processes */ |
850d2fec JK |
1450 | argv_array_push(&cld_argv, argv[0]); /* git-daemon */ |
1451 | argv_array_push(&cld_argv, "--serve"); | |
081f84ee | 1452 | for (i = 1; i < argc; ++i) |
850d2fec | 1453 | argv_array_push(&cld_argv, argv[i]); |
30e15602 | 1454 | |
a666b472 | 1455 | return serve(&listen_addr, listen_port, cred); |
a87e8be2 | 1456 | } |