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1 | #include "cache.h" | |
2 | #include "config.h" | |
3 | #include "pkt-line.h" | |
4 | #include "run-command.h" | |
5 | #include "strbuf.h" | |
6 | #include "string-list.h" | |
7 | ||
8 | #ifdef NO_INITGROUPS | |
9 | #define initgroups(x, y) (0) /* nothing */ | |
10 | #endif | |
11 | ||
12 | static enum log_destination { | |
13 | LOG_DESTINATION_UNSET = -1, | |
14 | LOG_DESTINATION_NONE = 0, | |
15 | LOG_DESTINATION_STDERR = 1, | |
16 | LOG_DESTINATION_SYSLOG = 2, | |
17 | } log_destination = LOG_DESTINATION_UNSET; | |
18 | static int verbose; | |
19 | static int reuseaddr; | |
20 | static int informative_errors; | |
21 | ||
22 | static const char daemon_usage[] = | |
23 | "git daemon [--verbose] [--syslog] [--export-all]\n" | |
24 | " [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n" | |
25 | " [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n" | |
26 | " [--user-path | --user-path=<path>]\n" | |
27 | " [--interpolated-path=<path>]\n" | |
28 | " [--reuseaddr] [--pid-file=<file>]\n" | |
29 | " [--(enable|disable|allow-override|forbid-override)=<service>]\n" | |
30 | " [--access-hook=<path>]\n" | |
31 | " [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n" | |
32 | " [--detach] [--user=<user> [--group=<group>]]\n" | |
33 | " [--log-destination=(stderr|syslog|none)]\n" | |
34 | " [<directory>...]"; | |
35 | ||
36 | /* List of acceptable pathname prefixes */ | |
37 | static const char **ok_paths; | |
38 | static int strict_paths; | |
39 | ||
40 | /* If this is set, git-daemon-export-ok is not required */ | |
41 | static int export_all_trees; | |
42 | ||
43 | /* Take all paths relative to this one if non-NULL */ | |
44 | static const char *base_path; | |
45 | static const char *interpolated_path; | |
46 | static int base_path_relaxed; | |
47 | ||
48 | /* If defined, ~user notation is allowed and the string is inserted | |
49 | * after ~user/. E.g. a request to git://host/~alice/frotz would | |
50 | * go to /home/alice/pub_git/frotz with --user-path=pub_git. | |
51 | */ | |
52 | static const char *user_path; | |
53 | ||
54 | /* Timeout, and initial timeout */ | |
55 | static unsigned int timeout; | |
56 | static unsigned int init_timeout; | |
57 | ||
58 | struct hostinfo { | |
59 | struct strbuf hostname; | |
60 | struct strbuf canon_hostname; | |
61 | struct strbuf ip_address; | |
62 | struct strbuf tcp_port; | |
63 | unsigned int hostname_lookup_done:1; | |
64 | unsigned int saw_extended_args:1; | |
65 | }; | |
66 | #define HOSTINFO_INIT { \ | |
67 | .hostname = STRBUF_INIT, \ | |
68 | .canon_hostname = STRBUF_INIT, \ | |
69 | .ip_address = STRBUF_INIT, \ | |
70 | .tcp_port = STRBUF_INIT, \ | |
71 | } | |
72 | ||
73 | static void lookup_hostname(struct hostinfo *hi); | |
74 | ||
75 | static const char *get_canon_hostname(struct hostinfo *hi) | |
76 | { | |
77 | lookup_hostname(hi); | |
78 | return hi->canon_hostname.buf; | |
79 | } | |
80 | ||
81 | static const char *get_ip_address(struct hostinfo *hi) | |
82 | { | |
83 | lookup_hostname(hi); | |
84 | return hi->ip_address.buf; | |
85 | } | |
86 | ||
87 | static void logreport(int priority, const char *err, va_list params) | |
88 | { | |
89 | switch (log_destination) { | |
90 | case LOG_DESTINATION_SYSLOG: { | |
91 | char buf[1024]; | |
92 | vsnprintf(buf, sizeof(buf), err, params); | |
93 | syslog(priority, "%s", buf); | |
94 | break; | |
95 | } | |
96 | case LOG_DESTINATION_STDERR: | |
97 | /* | |
98 | * Since stderr is set to buffered mode, the | |
99 | * logging of different processes will not overlap | |
100 | * unless they overflow the (rather big) buffers. | |
101 | */ | |
102 | fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid()); | |
103 | vfprintf(stderr, err, params); | |
104 | fputc('\n', stderr); | |
105 | fflush(stderr); | |
106 | break; | |
107 | case LOG_DESTINATION_NONE: | |
108 | break; | |
109 | case LOG_DESTINATION_UNSET: | |
110 | BUG("log destination not initialized correctly"); | |
111 | } | |
112 | } | |
113 | ||
114 | __attribute__((format (printf, 1, 2))) | |
115 | static void logerror(const char *err, ...) | |
116 | { | |
117 | va_list params; | |
118 | va_start(params, err); | |
119 | logreport(LOG_ERR, err, params); | |
120 | va_end(params); | |
121 | } | |
122 | ||
123 | __attribute__((format (printf, 1, 2))) | |
124 | static void loginfo(const char *err, ...) | |
125 | { | |
126 | va_list params; | |
127 | if (!verbose) | |
128 | return; | |
129 | va_start(params, err); | |
130 | logreport(LOG_INFO, err, params); | |
131 | va_end(params); | |
132 | } | |
133 | ||
134 | static void NORETURN daemon_die(const char *err, va_list params) | |
135 | { | |
136 | logreport(LOG_ERR, err, params); | |
137 | exit(1); | |
138 | } | |
139 | ||
140 | struct expand_path_context { | |
141 | const char *directory; | |
142 | struct hostinfo *hostinfo; | |
143 | }; | |
144 | ||
145 | static size_t expand_path(struct strbuf *sb, const char *placeholder, void *ctx) | |
146 | { | |
147 | struct expand_path_context *context = ctx; | |
148 | struct hostinfo *hi = context->hostinfo; | |
149 | ||
150 | switch (placeholder[0]) { | |
151 | case 'H': | |
152 | strbuf_addbuf(sb, &hi->hostname); | |
153 | return 1; | |
154 | case 'C': | |
155 | if (placeholder[1] == 'H') { | |
156 | strbuf_addstr(sb, get_canon_hostname(hi)); | |
157 | return 2; | |
158 | } | |
159 | break; | |
160 | case 'I': | |
161 | if (placeholder[1] == 'P') { | |
162 | strbuf_addstr(sb, get_ip_address(hi)); | |
163 | return 2; | |
164 | } | |
165 | break; | |
166 | case 'P': | |
167 | strbuf_addbuf(sb, &hi->tcp_port); | |
168 | return 1; | |
169 | case 'D': | |
170 | strbuf_addstr(sb, context->directory); | |
171 | return 1; | |
172 | } | |
173 | return 0; | |
174 | } | |
175 | ||
176 | static const char *path_ok(const char *directory, struct hostinfo *hi) | |
177 | { | |
178 | static char rpath[PATH_MAX]; | |
179 | static char interp_path[PATH_MAX]; | |
180 | size_t rlen; | |
181 | const char *path; | |
182 | const char *dir; | |
183 | ||
184 | dir = directory; | |
185 | ||
186 | if (daemon_avoid_alias(dir)) { | |
187 | logerror("'%s': aliased", dir); | |
188 | return NULL; | |
189 | } | |
190 | ||
191 | if (*dir == '~') { | |
192 | if (!user_path) { | |
193 | logerror("'%s': User-path not allowed", dir); | |
194 | return NULL; | |
195 | } | |
196 | if (*user_path) { | |
197 | /* Got either "~alice" or "~alice/foo"; | |
198 | * rewrite them to "~alice/%s" or | |
199 | * "~alice/%s/foo". | |
200 | */ | |
201 | int namlen, restlen = strlen(dir); | |
202 | const char *slash = strchr(dir, '/'); | |
203 | if (!slash) | |
204 | slash = dir + restlen; | |
205 | namlen = slash - dir; | |
206 | restlen -= namlen; | |
207 | loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash); | |
208 | rlen = snprintf(rpath, sizeof(rpath), "%.*s/%s%.*s", | |
209 | namlen, dir, user_path, restlen, slash); | |
210 | if (rlen >= sizeof(rpath)) { | |
211 | logerror("user-path too large: %s", rpath); | |
212 | return NULL; | |
213 | } | |
214 | dir = rpath; | |
215 | } | |
216 | } | |
217 | else if (interpolated_path && hi->saw_extended_args) { | |
218 | struct strbuf expanded_path = STRBUF_INIT; | |
219 | struct expand_path_context context; | |
220 | ||
221 | context.directory = directory; | |
222 | context.hostinfo = hi; | |
223 | ||
224 | if (*dir != '/') { | |
225 | /* Allow only absolute */ | |
226 | logerror("'%s': Non-absolute path denied (interpolated-path active)", dir); | |
227 | return NULL; | |
228 | } | |
229 | ||
230 | strbuf_expand(&expanded_path, interpolated_path, | |
231 | expand_path, &context); | |
232 | ||
233 | rlen = strlcpy(interp_path, expanded_path.buf, | |
234 | sizeof(interp_path)); | |
235 | if (rlen >= sizeof(interp_path)) { | |
236 | logerror("interpolated path too large: %s", | |
237 | interp_path); | |
238 | return NULL; | |
239 | } | |
240 | ||
241 | strbuf_release(&expanded_path); | |
242 | loginfo("Interpolated dir '%s'", interp_path); | |
243 | ||
244 | dir = interp_path; | |
245 | } | |
246 | else if (base_path) { | |
247 | if (*dir != '/') { | |
248 | /* Allow only absolute */ | |
249 | logerror("'%s': Non-absolute path denied (base-path active)", dir); | |
250 | return NULL; | |
251 | } | |
252 | rlen = snprintf(rpath, sizeof(rpath), "%s%s", base_path, dir); | |
253 | if (rlen >= sizeof(rpath)) { | |
254 | logerror("base-path too large: %s", rpath); | |
255 | return NULL; | |
256 | } | |
257 | dir = rpath; | |
258 | } | |
259 | ||
260 | path = enter_repo(dir, strict_paths); | |
261 | if (!path && base_path && base_path_relaxed) { | |
262 | /* | |
263 | * if we fail and base_path_relaxed is enabled, try without | |
264 | * prefixing the base path | |
265 | */ | |
266 | dir = directory; | |
267 | path = enter_repo(dir, strict_paths); | |
268 | } | |
269 | ||
270 | if (!path) { | |
271 | logerror("'%s' does not appear to be a git repository", dir); | |
272 | return NULL; | |
273 | } | |
274 | ||
275 | if ( ok_paths && *ok_paths ) { | |
276 | const char **pp; | |
277 | int pathlen = strlen(path); | |
278 | ||
279 | /* The validation is done on the paths after enter_repo | |
280 | * appends optional {.git,.git/.git} and friends, but | |
281 | * it does not use getcwd(). So if your /pub is | |
282 | * a symlink to /mnt/pub, you can whitelist /pub and | |
283 | * do not have to say /mnt/pub. | |
284 | * Do not say /pub/. | |
285 | */ | |
286 | for ( pp = ok_paths ; *pp ; pp++ ) { | |
287 | int len = strlen(*pp); | |
288 | if (len <= pathlen && | |
289 | !memcmp(*pp, path, len) && | |
290 | (path[len] == '\0' || | |
291 | (!strict_paths && path[len] == '/'))) | |
292 | return path; | |
293 | } | |
294 | } | |
295 | else { | |
296 | /* be backwards compatible */ | |
297 | if (!strict_paths) | |
298 | return path; | |
299 | } | |
300 | ||
301 | logerror("'%s': not in whitelist", path); | |
302 | return NULL; /* Fallthrough. Deny by default */ | |
303 | } | |
304 | ||
305 | typedef int (*daemon_service_fn)(const struct strvec *env); | |
306 | struct daemon_service { | |
307 | const char *name; | |
308 | const char *config_name; | |
309 | daemon_service_fn fn; | |
310 | int enabled; | |
311 | int overridable; | |
312 | }; | |
313 | ||
314 | static int daemon_error(const char *dir, const char *msg) | |
315 | { | |
316 | if (!informative_errors) | |
317 | msg = "access denied or repository not exported"; | |
318 | packet_write_fmt(1, "ERR %s: %s", msg, dir); | |
319 | return -1; | |
320 | } | |
321 | ||
322 | static const char *access_hook; | |
323 | ||
324 | static int run_access_hook(struct daemon_service *service, const char *dir, | |
325 | const char *path, struct hostinfo *hi) | |
326 | { | |
327 | struct child_process child = CHILD_PROCESS_INIT; | |
328 | struct strbuf buf = STRBUF_INIT; | |
329 | const char *argv[8]; | |
330 | const char **arg = argv; | |
331 | char *eol; | |
332 | int seen_errors = 0; | |
333 | ||
334 | *arg++ = access_hook; | |
335 | *arg++ = service->name; | |
336 | *arg++ = path; | |
337 | *arg++ = hi->hostname.buf; | |
338 | *arg++ = get_canon_hostname(hi); | |
339 | *arg++ = get_ip_address(hi); | |
340 | *arg++ = hi->tcp_port.buf; | |
341 | *arg = NULL; | |
342 | ||
343 | child.use_shell = 1; | |
344 | child.argv = argv; | |
345 | child.no_stdin = 1; | |
346 | child.no_stderr = 1; | |
347 | child.out = -1; | |
348 | if (start_command(&child)) { | |
349 | logerror("daemon access hook '%s' failed to start", | |
350 | access_hook); | |
351 | goto error_return; | |
352 | } | |
353 | if (strbuf_read(&buf, child.out, 0) < 0) { | |
354 | logerror("failed to read from pipe to daemon access hook '%s'", | |
355 | access_hook); | |
356 | strbuf_reset(&buf); | |
357 | seen_errors = 1; | |
358 | } | |
359 | if (close(child.out) < 0) { | |
360 | logerror("failed to close pipe to daemon access hook '%s'", | |
361 | access_hook); | |
362 | seen_errors = 1; | |
363 | } | |
364 | if (finish_command(&child)) | |
365 | seen_errors = 1; | |
366 | ||
367 | if (!seen_errors) { | |
368 | strbuf_release(&buf); | |
369 | return 0; | |
370 | } | |
371 | ||
372 | error_return: | |
373 | strbuf_ltrim(&buf); | |
374 | if (!buf.len) | |
375 | strbuf_addstr(&buf, "service rejected"); | |
376 | eol = strchr(buf.buf, '\n'); | |
377 | if (eol) | |
378 | *eol = '\0'; | |
379 | errno = EACCES; | |
380 | daemon_error(dir, buf.buf); | |
381 | strbuf_release(&buf); | |
382 | return -1; | |
383 | } | |
384 | ||
385 | static int run_service(const char *dir, struct daemon_service *service, | |
386 | struct hostinfo *hi, const struct strvec *env) | |
387 | { | |
388 | const char *path; | |
389 | int enabled = service->enabled; | |
390 | struct strbuf var = STRBUF_INIT; | |
391 | ||
392 | loginfo("Request %s for '%s'", service->name, dir); | |
393 | ||
394 | if (!enabled && !service->overridable) { | |
395 | logerror("'%s': service not enabled.", service->name); | |
396 | errno = EACCES; | |
397 | return daemon_error(dir, "service not enabled"); | |
398 | } | |
399 | ||
400 | if (!(path = path_ok(dir, hi))) | |
401 | return daemon_error(dir, "no such repository"); | |
402 | ||
403 | /* | |
404 | * Security on the cheap. | |
405 | * | |
406 | * We want a readable HEAD, usable "objects" directory, and | |
407 | * a "git-daemon-export-ok" flag that says that the other side | |
408 | * is ok with us doing this. | |
409 | * | |
410 | * path_ok() uses enter_repo() and does whitelist checking. | |
411 | * We only need to make sure the repository is exported. | |
412 | */ | |
413 | ||
414 | if (!export_all_trees && access("git-daemon-export-ok", F_OK)) { | |
415 | logerror("'%s': repository not exported.", path); | |
416 | errno = EACCES; | |
417 | return daemon_error(dir, "repository not exported"); | |
418 | } | |
419 | ||
420 | if (service->overridable) { | |
421 | strbuf_addf(&var, "daemon.%s", service->config_name); | |
422 | git_config_get_bool(var.buf, &enabled); | |
423 | strbuf_release(&var); | |
424 | } | |
425 | if (!enabled) { | |
426 | logerror("'%s': service not enabled for '%s'", | |
427 | service->name, path); | |
428 | errno = EACCES; | |
429 | return daemon_error(dir, "service not enabled"); | |
430 | } | |
431 | ||
432 | /* | |
433 | * Optionally, a hook can choose to deny access to the | |
434 | * repository depending on the phase of the moon. | |
435 | */ | |
436 | if (access_hook && run_access_hook(service, dir, path, hi)) | |
437 | return -1; | |
438 | ||
439 | /* | |
440 | * We'll ignore SIGTERM from now on, we have a | |
441 | * good client. | |
442 | */ | |
443 | signal(SIGTERM, SIG_IGN); | |
444 | ||
445 | return service->fn(env); | |
446 | } | |
447 | ||
448 | static void copy_to_log(int fd) | |
449 | { | |
450 | struct strbuf line = STRBUF_INIT; | |
451 | FILE *fp; | |
452 | ||
453 | fp = fdopen(fd, "r"); | |
454 | if (fp == NULL) { | |
455 | logerror("fdopen of error channel failed"); | |
456 | close(fd); | |
457 | return; | |
458 | } | |
459 | ||
460 | while (strbuf_getline_lf(&line, fp) != EOF) { | |
461 | logerror("%s", line.buf); | |
462 | strbuf_setlen(&line, 0); | |
463 | } | |
464 | ||
465 | strbuf_release(&line); | |
466 | fclose(fp); | |
467 | } | |
468 | ||
469 | static int run_service_command(struct child_process *cld) | |
470 | { | |
471 | strvec_push(&cld->args, "."); | |
472 | cld->git_cmd = 1; | |
473 | cld->err = -1; | |
474 | if (start_command(cld)) | |
475 | return -1; | |
476 | ||
477 | close(0); | |
478 | close(1); | |
479 | ||
480 | copy_to_log(cld->err); | |
481 | ||
482 | return finish_command(cld); | |
483 | } | |
484 | ||
485 | static int upload_pack(const struct strvec *env) | |
486 | { | |
487 | struct child_process cld = CHILD_PROCESS_INIT; | |
488 | strvec_pushl(&cld.args, "upload-pack", "--strict", NULL); | |
489 | strvec_pushf(&cld.args, "--timeout=%u", timeout); | |
490 | ||
491 | strvec_pushv(&cld.env_array, env->v); | |
492 | ||
493 | return run_service_command(&cld); | |
494 | } | |
495 | ||
496 | static int upload_archive(const struct strvec *env) | |
497 | { | |
498 | struct child_process cld = CHILD_PROCESS_INIT; | |
499 | strvec_push(&cld.args, "upload-archive"); | |
500 | ||
501 | strvec_pushv(&cld.env_array, env->v); | |
502 | ||
503 | return run_service_command(&cld); | |
504 | } | |
505 | ||
506 | static int receive_pack(const struct strvec *env) | |
507 | { | |
508 | struct child_process cld = CHILD_PROCESS_INIT; | |
509 | strvec_push(&cld.args, "receive-pack"); | |
510 | ||
511 | strvec_pushv(&cld.env_array, env->v); | |
512 | ||
513 | return run_service_command(&cld); | |
514 | } | |
515 | ||
516 | static struct daemon_service daemon_service[] = { | |
517 | { "upload-archive", "uploadarch", upload_archive, 0, 1 }, | |
518 | { "upload-pack", "uploadpack", upload_pack, 1, 1 }, | |
519 | { "receive-pack", "receivepack", receive_pack, 0, 1 }, | |
520 | }; | |
521 | ||
522 | static void enable_service(const char *name, int ena) | |
523 | { | |
524 | int i; | |
525 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { | |
526 | if (!strcmp(daemon_service[i].name, name)) { | |
527 | daemon_service[i].enabled = ena; | |
528 | return; | |
529 | } | |
530 | } | |
531 | die("No such service %s", name); | |
532 | } | |
533 | ||
534 | static void make_service_overridable(const char *name, int ena) | |
535 | { | |
536 | int i; | |
537 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { | |
538 | if (!strcmp(daemon_service[i].name, name)) { | |
539 | daemon_service[i].overridable = ena; | |
540 | return; | |
541 | } | |
542 | } | |
543 | die("No such service %s", name); | |
544 | } | |
545 | ||
546 | static void parse_host_and_port(char *hostport, char **host, | |
547 | char **port) | |
548 | { | |
549 | if (*hostport == '[') { | |
550 | char *end; | |
551 | ||
552 | end = strchr(hostport, ']'); | |
553 | if (!end) | |
554 | die("Invalid request ('[' without ']')"); | |
555 | *end = '\0'; | |
556 | *host = hostport + 1; | |
557 | if (!end[1]) | |
558 | *port = NULL; | |
559 | else if (end[1] == ':') | |
560 | *port = end + 2; | |
561 | else | |
562 | die("Garbage after end of host part"); | |
563 | } else { | |
564 | *host = hostport; | |
565 | *port = strrchr(hostport, ':'); | |
566 | if (*port) { | |
567 | **port = '\0'; | |
568 | ++*port; | |
569 | } | |
570 | } | |
571 | } | |
572 | ||
573 | /* | |
574 | * Sanitize a string from the client so that it's OK to be inserted into a | |
575 | * filesystem path. Specifically, we disallow directory separators, runs | |
576 | * of "..", and trailing and leading dots, which means that the client | |
577 | * cannot escape our base path via ".." traversal. | |
578 | */ | |
579 | static void sanitize_client(struct strbuf *out, const char *in) | |
580 | { | |
581 | for (; *in; in++) { | |
582 | if (is_dir_sep(*in)) | |
583 | continue; | |
584 | if (*in == '.' && (!out->len || out->buf[out->len - 1] == '.')) | |
585 | continue; | |
586 | strbuf_addch(out, *in); | |
587 | } | |
588 | ||
589 | while (out->len && out->buf[out->len - 1] == '.') | |
590 | strbuf_setlen(out, out->len - 1); | |
591 | } | |
592 | ||
593 | /* | |
594 | * Like sanitize_client, but we also perform any canonicalization | |
595 | * to make life easier on the admin. | |
596 | */ | |
597 | static void canonicalize_client(struct strbuf *out, const char *in) | |
598 | { | |
599 | sanitize_client(out, in); | |
600 | strbuf_tolower(out); | |
601 | } | |
602 | ||
603 | /* | |
604 | * Read the host as supplied by the client connection. | |
605 | * | |
606 | * Returns a pointer to the character after the NUL byte terminating the host | |
607 | * argument, or 'extra_args' if there is no host argument. | |
608 | */ | |
609 | static char *parse_host_arg(struct hostinfo *hi, char *extra_args, int buflen) | |
610 | { | |
611 | char *val; | |
612 | int vallen; | |
613 | char *end = extra_args + buflen; | |
614 | ||
615 | if (extra_args < end && *extra_args) { | |
616 | hi->saw_extended_args = 1; | |
617 | if (strncasecmp("host=", extra_args, 5) == 0) { | |
618 | val = extra_args + 5; | |
619 | vallen = strlen(val) + 1; | |
620 | loginfo("Extended attribute \"host\": %s", val); | |
621 | if (*val) { | |
622 | /* Split <host>:<port> at colon. */ | |
623 | char *host; | |
624 | char *port; | |
625 | parse_host_and_port(val, &host, &port); | |
626 | if (port) | |
627 | sanitize_client(&hi->tcp_port, port); | |
628 | canonicalize_client(&hi->hostname, host); | |
629 | hi->hostname_lookup_done = 0; | |
630 | } | |
631 | ||
632 | /* On to the next one */ | |
633 | extra_args = val + vallen; | |
634 | } | |
635 | if (extra_args < end && *extra_args) | |
636 | die("Invalid request"); | |
637 | } | |
638 | ||
639 | return extra_args; | |
640 | } | |
641 | ||
642 | static void parse_extra_args(struct hostinfo *hi, struct strvec *env, | |
643 | char *extra_args, int buflen) | |
644 | { | |
645 | const char *end = extra_args + buflen; | |
646 | struct strbuf git_protocol = STRBUF_INIT; | |
647 | ||
648 | /* First look for the host argument */ | |
649 | extra_args = parse_host_arg(hi, extra_args, buflen); | |
650 | ||
651 | /* Look for additional arguments places after a second NUL byte */ | |
652 | for (; extra_args < end; extra_args += strlen(extra_args) + 1) { | |
653 | const char *arg = extra_args; | |
654 | ||
655 | /* | |
656 | * Parse the extra arguments, adding most to 'git_protocol' | |
657 | * which will be used to set the 'GIT_PROTOCOL' envvar in the | |
658 | * service that will be run. | |
659 | * | |
660 | * If there ends up being a particular arg in the future that | |
661 | * git-daemon needs to parse specifically (like the 'host' arg) | |
662 | * then it can be parsed here and not added to 'git_protocol'. | |
663 | */ | |
664 | if (*arg) { | |
665 | if (git_protocol.len > 0) | |
666 | strbuf_addch(&git_protocol, ':'); | |
667 | strbuf_addstr(&git_protocol, arg); | |
668 | } | |
669 | } | |
670 | ||
671 | if (git_protocol.len > 0) { | |
672 | loginfo("Extended attribute \"protocol\": %s", git_protocol.buf); | |
673 | strvec_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=%s", | |
674 | git_protocol.buf); | |
675 | } | |
676 | strbuf_release(&git_protocol); | |
677 | } | |
678 | ||
679 | /* | |
680 | * Locate canonical hostname and its IP address. | |
681 | */ | |
682 | static void lookup_hostname(struct hostinfo *hi) | |
683 | { | |
684 | if (!hi->hostname_lookup_done && hi->hostname.len) { | |
685 | #ifndef NO_IPV6 | |
686 | struct addrinfo hints; | |
687 | struct addrinfo *ai; | |
688 | int gai; | |
689 | static char addrbuf[HOST_NAME_MAX + 1]; | |
690 | ||
691 | memset(&hints, 0, sizeof(hints)); | |
692 | hints.ai_flags = AI_CANONNAME; | |
693 | ||
694 | gai = getaddrinfo(hi->hostname.buf, NULL, &hints, &ai); | |
695 | if (!gai) { | |
696 | struct sockaddr_in *sin_addr = (void *)ai->ai_addr; | |
697 | ||
698 | inet_ntop(AF_INET, &sin_addr->sin_addr, | |
699 | addrbuf, sizeof(addrbuf)); | |
700 | strbuf_addstr(&hi->ip_address, addrbuf); | |
701 | ||
702 | if (ai->ai_canonname) | |
703 | sanitize_client(&hi->canon_hostname, | |
704 | ai->ai_canonname); | |
705 | else | |
706 | strbuf_addbuf(&hi->canon_hostname, | |
707 | &hi->ip_address); | |
708 | ||
709 | freeaddrinfo(ai); | |
710 | } | |
711 | #else | |
712 | struct hostent *hent; | |
713 | struct sockaddr_in sa; | |
714 | char **ap; | |
715 | static char addrbuf[HOST_NAME_MAX + 1]; | |
716 | ||
717 | hent = gethostbyname(hi->hostname.buf); | |
718 | if (hent) { | |
719 | ap = hent->h_addr_list; | |
720 | memset(&sa, 0, sizeof sa); | |
721 | sa.sin_family = hent->h_addrtype; | |
722 | sa.sin_port = htons(0); | |
723 | memcpy(&sa.sin_addr, *ap, hent->h_length); | |
724 | ||
725 | inet_ntop(hent->h_addrtype, &sa.sin_addr, | |
726 | addrbuf, sizeof(addrbuf)); | |
727 | ||
728 | sanitize_client(&hi->canon_hostname, hent->h_name); | |
729 | strbuf_addstr(&hi->ip_address, addrbuf); | |
730 | } | |
731 | #endif | |
732 | hi->hostname_lookup_done = 1; | |
733 | } | |
734 | } | |
735 | ||
736 | static void hostinfo_clear(struct hostinfo *hi) | |
737 | { | |
738 | strbuf_release(&hi->hostname); | |
739 | strbuf_release(&hi->canon_hostname); | |
740 | strbuf_release(&hi->ip_address); | |
741 | strbuf_release(&hi->tcp_port); | |
742 | } | |
743 | ||
744 | static void set_keep_alive(int sockfd) | |
745 | { | |
746 | int ka = 1; | |
747 | ||
748 | if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) { | |
749 | if (errno != ENOTSOCK) | |
750 | logerror("unable to set SO_KEEPALIVE on socket: %s", | |
751 | strerror(errno)); | |
752 | } | |
753 | } | |
754 | ||
755 | static int execute(void) | |
756 | { | |
757 | char *line = packet_buffer; | |
758 | int pktlen, len, i; | |
759 | char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT"); | |
760 | struct hostinfo hi = HOSTINFO_INIT; | |
761 | struct strvec env = STRVEC_INIT; | |
762 | ||
763 | if (addr) | |
764 | loginfo("Connection from %s:%s", addr, port); | |
765 | ||
766 | set_keep_alive(0); | |
767 | alarm(init_timeout ? init_timeout : timeout); | |
768 | pktlen = packet_read(0, packet_buffer, sizeof(packet_buffer), 0); | |
769 | alarm(0); | |
770 | ||
771 | len = strlen(line); | |
772 | if (len && line[len-1] == '\n') | |
773 | line[len-1] = 0; | |
774 | ||
775 | /* parse additional args hidden behind a NUL byte */ | |
776 | if (len != pktlen) | |
777 | parse_extra_args(&hi, &env, line + len + 1, pktlen - len - 1); | |
778 | ||
779 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { | |
780 | struct daemon_service *s = &(daemon_service[i]); | |
781 | const char *arg; | |
782 | ||
783 | if (skip_prefix(line, "git-", &arg) && | |
784 | skip_prefix(arg, s->name, &arg) && | |
785 | *arg++ == ' ') { | |
786 | /* | |
787 | * Note: The directory here is probably context sensitive, | |
788 | * and might depend on the actual service being performed. | |
789 | */ | |
790 | int rc = run_service(arg, s, &hi, &env); | |
791 | hostinfo_clear(&hi); | |
792 | strvec_clear(&env); | |
793 | return rc; | |
794 | } | |
795 | } | |
796 | ||
797 | hostinfo_clear(&hi); | |
798 | strvec_clear(&env); | |
799 | logerror("Protocol error: '%s'", line); | |
800 | return -1; | |
801 | } | |
802 | ||
803 | static int addrcmp(const struct sockaddr_storage *s1, | |
804 | const struct sockaddr_storage *s2) | |
805 | { | |
806 | const struct sockaddr *sa1 = (const struct sockaddr*) s1; | |
807 | const struct sockaddr *sa2 = (const struct sockaddr*) s2; | |
808 | ||
809 | if (sa1->sa_family != sa2->sa_family) | |
810 | return sa1->sa_family - sa2->sa_family; | |
811 | if (sa1->sa_family == AF_INET) | |
812 | return memcmp(&((struct sockaddr_in *)s1)->sin_addr, | |
813 | &((struct sockaddr_in *)s2)->sin_addr, | |
814 | sizeof(struct in_addr)); | |
815 | #ifndef NO_IPV6 | |
816 | if (sa1->sa_family == AF_INET6) | |
817 | return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr, | |
818 | &((struct sockaddr_in6 *)s2)->sin6_addr, | |
819 | sizeof(struct in6_addr)); | |
820 | #endif | |
821 | return 0; | |
822 | } | |
823 | ||
824 | static int max_connections = 32; | |
825 | ||
826 | static unsigned int live_children; | |
827 | ||
828 | static struct child { | |
829 | struct child *next; | |
830 | struct child_process cld; | |
831 | struct sockaddr_storage address; | |
832 | } *firstborn; | |
833 | ||
834 | static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen) | |
835 | { | |
836 | struct child *newborn, **cradle; | |
837 | ||
838 | CALLOC_ARRAY(newborn, 1); | |
839 | live_children++; | |
840 | memcpy(&newborn->cld, cld, sizeof(*cld)); | |
841 | memcpy(&newborn->address, addr, addrlen); | |
842 | for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next) | |
843 | if (!addrcmp(&(*cradle)->address, &newborn->address)) | |
844 | break; | |
845 | newborn->next = *cradle; | |
846 | *cradle = newborn; | |
847 | } | |
848 | ||
849 | /* | |
850 | * This gets called if the number of connections grows | |
851 | * past "max_connections". | |
852 | * | |
853 | * We kill the newest connection from a duplicate IP. | |
854 | */ | |
855 | static void kill_some_child(void) | |
856 | { | |
857 | const struct child *blanket, *next; | |
858 | ||
859 | if (!(blanket = firstborn)) | |
860 | return; | |
861 | ||
862 | for (; (next = blanket->next); blanket = next) | |
863 | if (!addrcmp(&blanket->address, &next->address)) { | |
864 | kill(blanket->cld.pid, SIGTERM); | |
865 | break; | |
866 | } | |
867 | } | |
868 | ||
869 | static void check_dead_children(void) | |
870 | { | |
871 | int status; | |
872 | pid_t pid; | |
873 | ||
874 | struct child **cradle, *blanket; | |
875 | for (cradle = &firstborn; (blanket = *cradle);) | |
876 | if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) { | |
877 | const char *dead = ""; | |
878 | if (status) | |
879 | dead = " (with error)"; | |
880 | loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead); | |
881 | ||
882 | /* remove the child */ | |
883 | *cradle = blanket->next; | |
884 | live_children--; | |
885 | child_process_clear(&blanket->cld); | |
886 | free(blanket); | |
887 | } else | |
888 | cradle = &blanket->next; | |
889 | } | |
890 | ||
891 | static struct strvec cld_argv = STRVEC_INIT; | |
892 | static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen) | |
893 | { | |
894 | struct child_process cld = CHILD_PROCESS_INIT; | |
895 | ||
896 | if (max_connections && live_children >= max_connections) { | |
897 | kill_some_child(); | |
898 | sleep(1); /* give it some time to die */ | |
899 | check_dead_children(); | |
900 | if (live_children >= max_connections) { | |
901 | close(incoming); | |
902 | logerror("Too many children, dropping connection"); | |
903 | return; | |
904 | } | |
905 | } | |
906 | ||
907 | if (addr->sa_family == AF_INET) { | |
908 | char buf[128] = ""; | |
909 | struct sockaddr_in *sin_addr = (void *) addr; | |
910 | inet_ntop(addr->sa_family, &sin_addr->sin_addr, buf, sizeof(buf)); | |
911 | strvec_pushf(&cld.env_array, "REMOTE_ADDR=%s", buf); | |
912 | strvec_pushf(&cld.env_array, "REMOTE_PORT=%d", | |
913 | ntohs(sin_addr->sin_port)); | |
914 | #ifndef NO_IPV6 | |
915 | } else if (addr->sa_family == AF_INET6) { | |
916 | char buf[128] = ""; | |
917 | struct sockaddr_in6 *sin6_addr = (void *) addr; | |
918 | inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(buf)); | |
919 | strvec_pushf(&cld.env_array, "REMOTE_ADDR=[%s]", buf); | |
920 | strvec_pushf(&cld.env_array, "REMOTE_PORT=%d", | |
921 | ntohs(sin6_addr->sin6_port)); | |
922 | #endif | |
923 | } | |
924 | ||
925 | cld.argv = cld_argv.v; | |
926 | cld.in = incoming; | |
927 | cld.out = dup(incoming); | |
928 | ||
929 | if (start_command(&cld)) | |
930 | logerror("unable to fork"); | |
931 | else | |
932 | add_child(&cld, addr, addrlen); | |
933 | } | |
934 | ||
935 | static void child_handler(int signo) | |
936 | { | |
937 | /* | |
938 | * Otherwise empty handler because systemcalls will get interrupted | |
939 | * upon signal receipt | |
940 | * SysV needs the handler to be rearmed | |
941 | */ | |
942 | signal(SIGCHLD, child_handler); | |
943 | } | |
944 | ||
945 | static int set_reuse_addr(int sockfd) | |
946 | { | |
947 | int on = 1; | |
948 | ||
949 | if (!reuseaddr) | |
950 | return 0; | |
951 | return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, | |
952 | &on, sizeof(on)); | |
953 | } | |
954 | ||
955 | struct socketlist { | |
956 | int *list; | |
957 | size_t nr; | |
958 | size_t alloc; | |
959 | }; | |
960 | ||
961 | static const char *ip2str(int family, struct sockaddr *sin, socklen_t len) | |
962 | { | |
963 | #ifdef NO_IPV6 | |
964 | static char ip[INET_ADDRSTRLEN]; | |
965 | #else | |
966 | static char ip[INET6_ADDRSTRLEN]; | |
967 | #endif | |
968 | ||
969 | switch (family) { | |
970 | #ifndef NO_IPV6 | |
971 | case AF_INET6: | |
972 | inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len); | |
973 | break; | |
974 | #endif | |
975 | case AF_INET: | |
976 | inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len); | |
977 | break; | |
978 | default: | |
979 | xsnprintf(ip, sizeof(ip), "<unknown>"); | |
980 | } | |
981 | return ip; | |
982 | } | |
983 | ||
984 | #ifndef NO_IPV6 | |
985 | ||
986 | static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist) | |
987 | { | |
988 | int socknum = 0; | |
989 | char pbuf[NI_MAXSERV]; | |
990 | struct addrinfo hints, *ai0, *ai; | |
991 | int gai; | |
992 | long flags; | |
993 | ||
994 | xsnprintf(pbuf, sizeof(pbuf), "%d", listen_port); | |
995 | memset(&hints, 0, sizeof(hints)); | |
996 | hints.ai_family = AF_UNSPEC; | |
997 | hints.ai_socktype = SOCK_STREAM; | |
998 | hints.ai_protocol = IPPROTO_TCP; | |
999 | hints.ai_flags = AI_PASSIVE; | |
1000 | ||
1001 | gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0); | |
1002 | if (gai) { | |
1003 | logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai)); | |
1004 | return 0; | |
1005 | } | |
1006 | ||
1007 | for (ai = ai0; ai; ai = ai->ai_next) { | |
1008 | int sockfd; | |
1009 | ||
1010 | sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); | |
1011 | if (sockfd < 0) | |
1012 | continue; | |
1013 | if (sockfd >= FD_SETSIZE) { | |
1014 | logerror("Socket descriptor too large"); | |
1015 | close(sockfd); | |
1016 | continue; | |
1017 | } | |
1018 | ||
1019 | #ifdef IPV6_V6ONLY | |
1020 | if (ai->ai_family == AF_INET6) { | |
1021 | int on = 1; | |
1022 | setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, | |
1023 | &on, sizeof(on)); | |
1024 | /* Note: error is not fatal */ | |
1025 | } | |
1026 | #endif | |
1027 | ||
1028 | if (set_reuse_addr(sockfd)) { | |
1029 | logerror("Could not set SO_REUSEADDR: %s", strerror(errno)); | |
1030 | close(sockfd); | |
1031 | continue; | |
1032 | } | |
1033 | ||
1034 | set_keep_alive(sockfd); | |
1035 | ||
1036 | if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) { | |
1037 | logerror("Could not bind to %s: %s", | |
1038 | ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen), | |
1039 | strerror(errno)); | |
1040 | close(sockfd); | |
1041 | continue; /* not fatal */ | |
1042 | } | |
1043 | if (listen(sockfd, 5) < 0) { | |
1044 | logerror("Could not listen to %s: %s", | |
1045 | ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen), | |
1046 | strerror(errno)); | |
1047 | close(sockfd); | |
1048 | continue; /* not fatal */ | |
1049 | } | |
1050 | ||
1051 | flags = fcntl(sockfd, F_GETFD, 0); | |
1052 | if (flags >= 0) | |
1053 | fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC); | |
1054 | ||
1055 | ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc); | |
1056 | socklist->list[socklist->nr++] = sockfd; | |
1057 | socknum++; | |
1058 | } | |
1059 | ||
1060 | freeaddrinfo(ai0); | |
1061 | ||
1062 | return socknum; | |
1063 | } | |
1064 | ||
1065 | #else /* NO_IPV6 */ | |
1066 | ||
1067 | static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist) | |
1068 | { | |
1069 | struct sockaddr_in sin; | |
1070 | int sockfd; | |
1071 | long flags; | |
1072 | ||
1073 | memset(&sin, 0, sizeof sin); | |
1074 | sin.sin_family = AF_INET; | |
1075 | sin.sin_port = htons(listen_port); | |
1076 | ||
1077 | if (listen_addr) { | |
1078 | /* Well, host better be an IP address here. */ | |
1079 | if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0) | |
1080 | return 0; | |
1081 | } else { | |
1082 | sin.sin_addr.s_addr = htonl(INADDR_ANY); | |
1083 | } | |
1084 | ||
1085 | sockfd = socket(AF_INET, SOCK_STREAM, 0); | |
1086 | if (sockfd < 0) | |
1087 | return 0; | |
1088 | ||
1089 | if (set_reuse_addr(sockfd)) { | |
1090 | logerror("Could not set SO_REUSEADDR: %s", strerror(errno)); | |
1091 | close(sockfd); | |
1092 | return 0; | |
1093 | } | |
1094 | ||
1095 | set_keep_alive(sockfd); | |
1096 | ||
1097 | if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) { | |
1098 | logerror("Could not bind to %s: %s", | |
1099 | ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)), | |
1100 | strerror(errno)); | |
1101 | close(sockfd); | |
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | if (listen(sockfd, 5) < 0) { | |
1106 | logerror("Could not listen to %s: %s", | |
1107 | ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)), | |
1108 | strerror(errno)); | |
1109 | close(sockfd); | |
1110 | return 0; | |
1111 | } | |
1112 | ||
1113 | flags = fcntl(sockfd, F_GETFD, 0); | |
1114 | if (flags >= 0) | |
1115 | fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC); | |
1116 | ||
1117 | ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc); | |
1118 | socklist->list[socklist->nr++] = sockfd; | |
1119 | return 1; | |
1120 | } | |
1121 | ||
1122 | #endif | |
1123 | ||
1124 | static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist) | |
1125 | { | |
1126 | if (!listen_addr->nr) | |
1127 | setup_named_sock(NULL, listen_port, socklist); | |
1128 | else { | |
1129 | int i, socknum; | |
1130 | for (i = 0; i < listen_addr->nr; i++) { | |
1131 | socknum = setup_named_sock(listen_addr->items[i].string, | |
1132 | listen_port, socklist); | |
1133 | ||
1134 | if (socknum == 0) | |
1135 | logerror("unable to allocate any listen sockets for host %s on port %u", | |
1136 | listen_addr->items[i].string, listen_port); | |
1137 | } | |
1138 | } | |
1139 | } | |
1140 | ||
1141 | static int service_loop(struct socketlist *socklist) | |
1142 | { | |
1143 | struct pollfd *pfd; | |
1144 | int i; | |
1145 | ||
1146 | CALLOC_ARRAY(pfd, socklist->nr); | |
1147 | ||
1148 | for (i = 0; i < socklist->nr; i++) { | |
1149 | pfd[i].fd = socklist->list[i]; | |
1150 | pfd[i].events = POLLIN; | |
1151 | } | |
1152 | ||
1153 | signal(SIGCHLD, child_handler); | |
1154 | ||
1155 | for (;;) { | |
1156 | int i; | |
1157 | ||
1158 | check_dead_children(); | |
1159 | ||
1160 | if (poll(pfd, socklist->nr, -1) < 0) { | |
1161 | if (errno != EINTR) { | |
1162 | logerror("Poll failed, resuming: %s", | |
1163 | strerror(errno)); | |
1164 | sleep(1); | |
1165 | } | |
1166 | continue; | |
1167 | } | |
1168 | ||
1169 | for (i = 0; i < socklist->nr; i++) { | |
1170 | if (pfd[i].revents & POLLIN) { | |
1171 | union { | |
1172 | struct sockaddr sa; | |
1173 | struct sockaddr_in sai; | |
1174 | #ifndef NO_IPV6 | |
1175 | struct sockaddr_in6 sai6; | |
1176 | #endif | |
1177 | } ss; | |
1178 | socklen_t sslen = sizeof(ss); | |
1179 | int incoming = accept(pfd[i].fd, &ss.sa, &sslen); | |
1180 | if (incoming < 0) { | |
1181 | switch (errno) { | |
1182 | case EAGAIN: | |
1183 | case EINTR: | |
1184 | case ECONNABORTED: | |
1185 | continue; | |
1186 | default: | |
1187 | die_errno("accept returned"); | |
1188 | } | |
1189 | } | |
1190 | handle(incoming, &ss.sa, sslen); | |
1191 | } | |
1192 | } | |
1193 | } | |
1194 | } | |
1195 | ||
1196 | #ifdef NO_POSIX_GOODIES | |
1197 | ||
1198 | struct credentials; | |
1199 | ||
1200 | static void drop_privileges(struct credentials *cred) | |
1201 | { | |
1202 | /* nothing */ | |
1203 | } | |
1204 | ||
1205 | static struct credentials *prepare_credentials(const char *user_name, | |
1206 | const char *group_name) | |
1207 | { | |
1208 | die("--user not supported on this platform"); | |
1209 | } | |
1210 | ||
1211 | #else | |
1212 | ||
1213 | struct credentials { | |
1214 | struct passwd *pass; | |
1215 | gid_t gid; | |
1216 | }; | |
1217 | ||
1218 | static void drop_privileges(struct credentials *cred) | |
1219 | { | |
1220 | if (cred && (initgroups(cred->pass->pw_name, cred->gid) || | |
1221 | setgid (cred->gid) || setuid(cred->pass->pw_uid))) | |
1222 | die("cannot drop privileges"); | |
1223 | } | |
1224 | ||
1225 | static struct credentials *prepare_credentials(const char *user_name, | |
1226 | const char *group_name) | |
1227 | { | |
1228 | static struct credentials c; | |
1229 | ||
1230 | c.pass = getpwnam(user_name); | |
1231 | if (!c.pass) | |
1232 | die("user not found - %s", user_name); | |
1233 | ||
1234 | if (!group_name) | |
1235 | c.gid = c.pass->pw_gid; | |
1236 | else { | |
1237 | struct group *group = getgrnam(group_name); | |
1238 | if (!group) | |
1239 | die("group not found - %s", group_name); | |
1240 | ||
1241 | c.gid = group->gr_gid; | |
1242 | } | |
1243 | ||
1244 | return &c; | |
1245 | } | |
1246 | #endif | |
1247 | ||
1248 | static int serve(struct string_list *listen_addr, int listen_port, | |
1249 | struct credentials *cred) | |
1250 | { | |
1251 | struct socketlist socklist = { NULL, 0, 0 }; | |
1252 | ||
1253 | socksetup(listen_addr, listen_port, &socklist); | |
1254 | if (socklist.nr == 0) | |
1255 | die("unable to allocate any listen sockets on port %u", | |
1256 | listen_port); | |
1257 | ||
1258 | drop_privileges(cred); | |
1259 | ||
1260 | loginfo("Ready to rumble"); | |
1261 | ||
1262 | return service_loop(&socklist); | |
1263 | } | |
1264 | ||
1265 | int cmd_main(int argc, const char **argv) | |
1266 | { | |
1267 | int listen_port = 0; | |
1268 | struct string_list listen_addr = STRING_LIST_INIT_NODUP; | |
1269 | int serve_mode = 0, inetd_mode = 0; | |
1270 | const char *pid_file = NULL, *user_name = NULL, *group_name = NULL; | |
1271 | int detach = 0; | |
1272 | struct credentials *cred = NULL; | |
1273 | int i; | |
1274 | ||
1275 | for (i = 1; i < argc; i++) { | |
1276 | const char *arg = argv[i]; | |
1277 | const char *v; | |
1278 | ||
1279 | if (skip_prefix(arg, "--listen=", &v)) { | |
1280 | string_list_append(&listen_addr, xstrdup_tolower(v)); | |
1281 | continue; | |
1282 | } | |
1283 | if (skip_prefix(arg, "--port=", &v)) { | |
1284 | char *end; | |
1285 | unsigned long n; | |
1286 | n = strtoul(v, &end, 0); | |
1287 | if (*v && !*end) { | |
1288 | listen_port = n; | |
1289 | continue; | |
1290 | } | |
1291 | } | |
1292 | if (!strcmp(arg, "--serve")) { | |
1293 | serve_mode = 1; | |
1294 | continue; | |
1295 | } | |
1296 | if (!strcmp(arg, "--inetd")) { | |
1297 | inetd_mode = 1; | |
1298 | continue; | |
1299 | } | |
1300 | if (!strcmp(arg, "--verbose")) { | |
1301 | verbose = 1; | |
1302 | continue; | |
1303 | } | |
1304 | if (!strcmp(arg, "--syslog")) { | |
1305 | log_destination = LOG_DESTINATION_SYSLOG; | |
1306 | continue; | |
1307 | } | |
1308 | if (skip_prefix(arg, "--log-destination=", &v)) { | |
1309 | if (!strcmp(v, "syslog")) { | |
1310 | log_destination = LOG_DESTINATION_SYSLOG; | |
1311 | continue; | |
1312 | } else if (!strcmp(v, "stderr")) { | |
1313 | log_destination = LOG_DESTINATION_STDERR; | |
1314 | continue; | |
1315 | } else if (!strcmp(v, "none")) { | |
1316 | log_destination = LOG_DESTINATION_NONE; | |
1317 | continue; | |
1318 | } else | |
1319 | die("unknown log destination '%s'", v); | |
1320 | } | |
1321 | if (!strcmp(arg, "--export-all")) { | |
1322 | export_all_trees = 1; | |
1323 | continue; | |
1324 | } | |
1325 | if (skip_prefix(arg, "--access-hook=", &v)) { | |
1326 | access_hook = v; | |
1327 | continue; | |
1328 | } | |
1329 | if (skip_prefix(arg, "--timeout=", &v)) { | |
1330 | timeout = atoi(v); | |
1331 | continue; | |
1332 | } | |
1333 | if (skip_prefix(arg, "--init-timeout=", &v)) { | |
1334 | init_timeout = atoi(v); | |
1335 | continue; | |
1336 | } | |
1337 | if (skip_prefix(arg, "--max-connections=", &v)) { | |
1338 | max_connections = atoi(v); | |
1339 | if (max_connections < 0) | |
1340 | max_connections = 0; /* unlimited */ | |
1341 | continue; | |
1342 | } | |
1343 | if (!strcmp(arg, "--strict-paths")) { | |
1344 | strict_paths = 1; | |
1345 | continue; | |
1346 | } | |
1347 | if (skip_prefix(arg, "--base-path=", &v)) { | |
1348 | base_path = v; | |
1349 | continue; | |
1350 | } | |
1351 | if (!strcmp(arg, "--base-path-relaxed")) { | |
1352 | base_path_relaxed = 1; | |
1353 | continue; | |
1354 | } | |
1355 | if (skip_prefix(arg, "--interpolated-path=", &v)) { | |
1356 | interpolated_path = v; | |
1357 | continue; | |
1358 | } | |
1359 | if (!strcmp(arg, "--reuseaddr")) { | |
1360 | reuseaddr = 1; | |
1361 | continue; | |
1362 | } | |
1363 | if (!strcmp(arg, "--user-path")) { | |
1364 | user_path = ""; | |
1365 | continue; | |
1366 | } | |
1367 | if (skip_prefix(arg, "--user-path=", &v)) { | |
1368 | user_path = v; | |
1369 | continue; | |
1370 | } | |
1371 | if (skip_prefix(arg, "--pid-file=", &v)) { | |
1372 | pid_file = v; | |
1373 | continue; | |
1374 | } | |
1375 | if (!strcmp(arg, "--detach")) { | |
1376 | detach = 1; | |
1377 | continue; | |
1378 | } | |
1379 | if (skip_prefix(arg, "--user=", &v)) { | |
1380 | user_name = v; | |
1381 | continue; | |
1382 | } | |
1383 | if (skip_prefix(arg, "--group=", &v)) { | |
1384 | group_name = v; | |
1385 | continue; | |
1386 | } | |
1387 | if (skip_prefix(arg, "--enable=", &v)) { | |
1388 | enable_service(v, 1); | |
1389 | continue; | |
1390 | } | |
1391 | if (skip_prefix(arg, "--disable=", &v)) { | |
1392 | enable_service(v, 0); | |
1393 | continue; | |
1394 | } | |
1395 | if (skip_prefix(arg, "--allow-override=", &v)) { | |
1396 | make_service_overridable(v, 1); | |
1397 | continue; | |
1398 | } | |
1399 | if (skip_prefix(arg, "--forbid-override=", &v)) { | |
1400 | make_service_overridable(v, 0); | |
1401 | continue; | |
1402 | } | |
1403 | if (!strcmp(arg, "--informative-errors")) { | |
1404 | informative_errors = 1; | |
1405 | continue; | |
1406 | } | |
1407 | if (!strcmp(arg, "--no-informative-errors")) { | |
1408 | informative_errors = 0; | |
1409 | continue; | |
1410 | } | |
1411 | if (!strcmp(arg, "--")) { | |
1412 | ok_paths = &argv[i+1]; | |
1413 | break; | |
1414 | } else if (arg[0] != '-') { | |
1415 | ok_paths = &argv[i]; | |
1416 | break; | |
1417 | } | |
1418 | ||
1419 | usage(daemon_usage); | |
1420 | } | |
1421 | ||
1422 | if (log_destination == LOG_DESTINATION_UNSET) { | |
1423 | if (inetd_mode || detach) | |
1424 | log_destination = LOG_DESTINATION_SYSLOG; | |
1425 | else | |
1426 | log_destination = LOG_DESTINATION_STDERR; | |
1427 | } | |
1428 | ||
1429 | if (log_destination == LOG_DESTINATION_SYSLOG) { | |
1430 | openlog("git-daemon", LOG_PID, LOG_DAEMON); | |
1431 | set_die_routine(daemon_die); | |
1432 | } else | |
1433 | /* avoid splitting a message in the middle */ | |
1434 | setvbuf(stderr, NULL, _IOFBF, 4096); | |
1435 | ||
1436 | if (inetd_mode && (detach || group_name || user_name)) | |
1437 | die("--detach, --user and --group are incompatible with --inetd"); | |
1438 | ||
1439 | if (inetd_mode && (listen_port || (listen_addr.nr > 0))) | |
1440 | die("--listen= and --port= are incompatible with --inetd"); | |
1441 | else if (listen_port == 0) | |
1442 | listen_port = DEFAULT_GIT_PORT; | |
1443 | ||
1444 | if (group_name && !user_name) | |
1445 | die("--group supplied without --user"); | |
1446 | ||
1447 | if (user_name) | |
1448 | cred = prepare_credentials(user_name, group_name); | |
1449 | ||
1450 | if (strict_paths && (!ok_paths || !*ok_paths)) | |
1451 | die("option --strict-paths requires a whitelist"); | |
1452 | ||
1453 | if (base_path && !is_directory(base_path)) | |
1454 | die("base-path '%s' does not exist or is not a directory", | |
1455 | base_path); | |
1456 | ||
1457 | if (log_destination != LOG_DESTINATION_STDERR) { | |
1458 | if (!freopen("/dev/null", "w", stderr)) | |
1459 | die_errno("failed to redirect stderr to /dev/null"); | |
1460 | } | |
1461 | ||
1462 | if (inetd_mode || serve_mode) | |
1463 | return execute(); | |
1464 | ||
1465 | if (detach) { | |
1466 | if (daemonize()) | |
1467 | die("--detach not supported on this platform"); | |
1468 | } | |
1469 | ||
1470 | if (pid_file) | |
1471 | write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid()); | |
1472 | ||
1473 | /* prepare argv for serving-processes */ | |
1474 | strvec_push(&cld_argv, argv[0]); /* git-daemon */ | |
1475 | strvec_push(&cld_argv, "--serve"); | |
1476 | for (i = 1; i < argc; ++i) | |
1477 | strvec_push(&cld_argv, argv[i]); | |
1478 | ||
1479 | return serve(&listen_addr, listen_port, cred); | |
1480 | } |