34916c5e105812e36d659dfeeb8341e003e746bd
1#include "cache.h"
2#include "pkt-line.h"
3#include "exec_cmd.h"
4#include "run-command.h"
5#include "strbuf.h"
6#include "string-list.h"
7#ifndef HOST_NAME_MAX
9#define HOST_NAME_MAX 256
10#endif
11#ifdef NO_INITGROUPS
13#define initgroups(x, y) (0) /* nothing */
14#endif
15static int log_syslog;
17static int verbose;
18static int reuseaddr;
19static int informative_errors;
20static const char daemon_usage[] =
22"git daemon [--verbose] [--syslog] [--export-all]\n"
23" [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n"
24" [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n"
25" [--user-path | --user-path=<path>]\n"
26" [--interpolated-path=<path>]\n"
27" [--reuseaddr] [--pid-file=<file>]\n"
28" [--(enable|disable|allow-override|forbid-override)=<service>]\n"
29" [--access-hook=<path>]\n"
30" [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n"
31" [--detach] [--user=<user> [--group=<group>]]\n"
32" [<directory>...]";
33/* List of acceptable pathname prefixes */
35static char **ok_paths;
36static int strict_paths;
37/* If this is set, git-daemon-export-ok is not required */
39static int export_all_trees;
40/* Take all paths relative to this one if non-NULL */
42static char *base_path;
43static char *interpolated_path;
44static int base_path_relaxed;
45/* Flag indicating client sent extra args. */
47static int saw_extended_args;
48/* If defined, ~user notation is allowed and the string is inserted
50 * after ~user/. E.g. a request to git://host/~alice/frotz would
51 * go to /home/alice/pub_git/frotz with --user-path=pub_git.
52 */
53static const char *user_path;
54/* Timeout, and initial timeout */
56static unsigned int timeout;
57static unsigned int init_timeout;
58static char *hostname;
60static char *canon_hostname;
61static char *ip_address;
62static char *tcp_port;
63static void logreport(int priority, const char *err, va_list params)
65{
66 if (log_syslog) {
67 char buf[1024];
68 vsnprintf(buf, sizeof(buf), err, params);
69 syslog(priority, "%s", buf);
70 } else {
71 /*
72 * Since stderr is set to buffered mode, the
73 * logging of different processes will not overlap
74 * unless they overflow the (rather big) buffers.
75 */
76 fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
77 vfprintf(stderr, err, params);
78 fputc('\n', stderr);
79 fflush(stderr);
80 }
81}
82__attribute__((format (printf, 1, 2)))
84static void logerror(const char *err, ...)
85{
86 va_list params;
87 va_start(params, err);
88 logreport(LOG_ERR, err, params);
89 va_end(params);
90}
91__attribute__((format (printf, 1, 2)))
93static void loginfo(const char *err, ...)
94{
95 va_list params;
96 if (!verbose)
97 return;
98 va_start(params, err);
99 logreport(LOG_INFO, err, params);
100 va_end(params);
101}
102static void NORETURN daemon_die(const char *err, va_list params)
104{
105 logreport(LOG_ERR, err, params);
106 exit(1);
107}
108static const char *path_ok(char *directory)
110{
111 static char rpath[PATH_MAX];
112 static char interp_path[PATH_MAX];
113 const char *path;
114 char *dir;
115 dir = directory;
117 if (daemon_avoid_alias(dir)) {
119 logerror("'%s': aliased", dir);
120 return NULL;
121 }
122 if (*dir == '~') {
124 if (!user_path) {
125 logerror("'%s': User-path not allowed", dir);
126 return NULL;
127 }
128 if (*user_path) {
129 /* Got either "~alice" or "~alice/foo";
130 * rewrite them to "~alice/%s" or
131 * "~alice/%s/foo".
132 */
133 int namlen, restlen = strlen(dir);
134 char *slash = strchr(dir, '/');
135 if (!slash)
136 slash = dir + restlen;
137 namlen = slash - dir;
138 restlen -= namlen;
139 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
140 snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
141 namlen, dir, user_path, restlen, slash);
142 dir = rpath;
143 }
144 }
145 else if (interpolated_path && saw_extended_args) {
146 struct strbuf expanded_path = STRBUF_INIT;
147 struct strbuf_expand_dict_entry dict[6];
148 dict[0].placeholder = "H"; dict[0].value = hostname;
150 dict[1].placeholder = "CH"; dict[1].value = canon_hostname;
151 dict[2].placeholder = "IP"; dict[2].value = ip_address;
152 dict[3].placeholder = "P"; dict[3].value = tcp_port;
153 dict[4].placeholder = "D"; dict[4].value = directory;
154 dict[5].placeholder = NULL; dict[5].value = NULL;
155 if (*dir != '/') {
156 /* Allow only absolute */
157 logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
158 return NULL;
159 }
160 strbuf_expand(&expanded_path, interpolated_path,
162 strbuf_expand_dict_cb, &dict);
163 strlcpy(interp_path, expanded_path.buf, PATH_MAX);
164 strbuf_release(&expanded_path);
165 loginfo("Interpolated dir '%s'", interp_path);
166 dir = interp_path;
168 }
169 else if (base_path) {
170 if (*dir != '/') {
171 /* Allow only absolute */
172 logerror("'%s': Non-absolute path denied (base-path active)", dir);
173 return NULL;
174 }
175 snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
176 dir = rpath;
177 }
178 path = enter_repo(dir, strict_paths);
180 if (!path && base_path && base_path_relaxed) {
181 /*
182 * if we fail and base_path_relaxed is enabled, try without
183 * prefixing the base path
184 */
185 dir = directory;
186 path = enter_repo(dir, strict_paths);
187 }
188 if (!path) {
190 logerror("'%s' does not appear to be a git repository", dir);
191 return NULL;
192 }
193 if ( ok_paths && *ok_paths ) {
195 char **pp;
196 int pathlen = strlen(path);
197 /* The validation is done on the paths after enter_repo
199 * appends optional {.git,.git/.git} and friends, but
200 * it does not use getcwd(). So if your /pub is
201 * a symlink to /mnt/pub, you can whitelist /pub and
202 * do not have to say /mnt/pub.
203 * Do not say /pub/.
204 */
205 for ( pp = ok_paths ; *pp ; pp++ ) {
206 int len = strlen(*pp);
207 if (len <= pathlen &&
208 !memcmp(*pp, path, len) &&
209 (path[len] == '\0' ||
210 (!strict_paths && path[len] == '/')))
211 return path;
212 }
213 }
214 else {
215 /* be backwards compatible */
216 if (!strict_paths)
217 return path;
218 }
219 logerror("'%s': not in whitelist", path);
221 return NULL; /* Fallthrough. Deny by default */
222}
223typedef int (*daemon_service_fn)(void);
225struct daemon_service {
226 const char *name;
227 const char *config_name;
228 daemon_service_fn fn;
229 int enabled;
230 int overridable;
231};
232static struct daemon_service *service_looking_at;
234static int service_enabled;
235static int git_daemon_config(const char *var, const char *value, void *cb)
237{
238 if (!prefixcmp(var, "daemon.") &&
239 !strcmp(var + 7, service_looking_at->config_name)) {
240 service_enabled = git_config_bool(var, value);
241 return 0;
242 }
243 /* we are not interested in parsing any other configuration here */
245 return 0;
246}
247static int daemon_error(const char *dir, const char *msg)
249{
250 if (!informative_errors)
251 msg = "access denied or repository not exported";
252 packet_write(1, "ERR %s: %s", msg, dir);
253 return -1;
254}
255static char *access_hook;
257static int run_access_hook(struct daemon_service *service, const char *dir, const char *path)
259{
260 struct child_process child;
261 struct strbuf buf = STRBUF_INIT;
262 const char *argv[8];
263 const char **arg = argv;
264 char *eol;
265 int seen_errors = 0;
266#define STRARG(x) ((x) ? (x) : "")
268 *arg++ = access_hook;
269 *arg++ = service->name;
270 *arg++ = path;
271 *arg++ = STRARG(hostname);
272 *arg++ = STRARG(canon_hostname);
273 *arg++ = STRARG(ip_address);
274 *arg++ = STRARG(tcp_port);
275 *arg = NULL;
276#undef STRARG
277 memset(&child, 0, sizeof(child));
279 child.use_shell = 1;
280 child.argv = argv;
281 child.no_stdin = 1;
282 child.no_stderr = 1;
283 child.out = -1;
284 if (start_command(&child)) {
285 logerror("daemon access hook '%s' failed to start",
286 access_hook);
287 goto error_return;
288 }
289 if (strbuf_read(&buf, child.out, 0) < 0) {
290 logerror("failed to read from pipe to daemon access hook '%s'",
291 access_hook);
292 strbuf_reset(&buf);
293 seen_errors = 1;
294 }
295 if (close(child.out) < 0) {
296 logerror("failed to close pipe to daemon access hook '%s'",
297 access_hook);
298 seen_errors = 1;
299 }
300 if (finish_command(&child))
301 seen_errors = 1;
302 if (!seen_errors) {
304 strbuf_release(&buf);
305 return 0;
306 }
307error_return:
309 strbuf_ltrim(&buf);
310 if (!buf.len)
311 strbuf_addstr(&buf, "service rejected");
312 eol = strchr(buf.buf, '\n');
313 if (eol)
314 *eol = '\0';
315 errno = EACCES;
316 daemon_error(dir, buf.buf);
317 strbuf_release(&buf);
318 return -1;
319}
320static int run_service(char *dir, struct daemon_service *service)
322{
323 const char *path;
324 int enabled = service->enabled;
325 loginfo("Request %s for '%s'", service->name, dir);
327 if (!enabled && !service->overridable) {
329 logerror("'%s': service not enabled.", service->name);
330 errno = EACCES;
331 return daemon_error(dir, "service not enabled");
332 }
333 if (!(path = path_ok(dir)))
335 return daemon_error(dir, "no such repository");
336 /*
338 * Security on the cheap.
339 *
340 * We want a readable HEAD, usable "objects" directory, and
341 * a "git-daemon-export-ok" flag that says that the other side
342 * is ok with us doing this.
343 *
344 * path_ok() uses enter_repo() and does whitelist checking.
345 * We only need to make sure the repository is exported.
346 */
347 if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
349 logerror("'%s': repository not exported.", path);
350 errno = EACCES;
351 return daemon_error(dir, "repository not exported");
352 }
353 if (service->overridable) {
355 service_looking_at = service;
356 service_enabled = -1;
357 git_config(git_daemon_config, NULL);
358 if (0 <= service_enabled)
359 enabled = service_enabled;
360 }
361 if (!enabled) {
362 logerror("'%s': service not enabled for '%s'",
363 service->name, path);
364 errno = EACCES;
365 return daemon_error(dir, "service not enabled");
366 }
367 /*
369 * Optionally, a hook can choose to deny access to the
370 * repository depending on the phase of the moon.
371 */
372 if (access_hook && run_access_hook(service, dir, path))
373 return -1;
374 /*
376 * We'll ignore SIGTERM from now on, we have a
377 * good client.
378 */
379 signal(SIGTERM, SIG_IGN);
380 return service->fn();
382}
383static void copy_to_log(int fd)
385{
386 struct strbuf line = STRBUF_INIT;
387 FILE *fp;
388 fp = fdopen(fd, "r");
390 if (fp == NULL) {
391 logerror("fdopen of error channel failed");
392 close(fd);
393 return;
394 }
395 while (strbuf_getline(&line, fp, '\n') != EOF) {
397 logerror("%s", line.buf);
398 strbuf_setlen(&line, 0);
399 }
400 strbuf_release(&line);
402 fclose(fp);
403}
404static int run_service_command(const char **argv)
406{
407 struct child_process cld;
408 memset(&cld, 0, sizeof(cld));
410 cld.argv = argv;
411 cld.git_cmd = 1;
412 cld.err = -1;
413 if (start_command(&cld))
414 return -1;
415 close(0);
417 close(1);
418 copy_to_log(cld.err);
420 return finish_command(&cld);
422}
423static int upload_pack(void)
425{
426 /* Timeout as string */
427 char timeout_buf[64];
428 const char *argv[] = { "upload-pack", "--strict", NULL, ".", NULL };
429 argv[2] = timeout_buf;
431 snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
433 return run_service_command(argv);
434}
435static int upload_archive(void)
437{
438 static const char *argv[] = { "upload-archive", ".", NULL };
439 return run_service_command(argv);
440}
441static int receive_pack(void)
443{
444 static const char *argv[] = { "receive-pack", ".", NULL };
445 return run_service_command(argv);
446}
447static struct daemon_service daemon_service[] = {
449 { "upload-archive", "uploadarch", upload_archive, 0, 1 },
450 { "upload-pack", "uploadpack", upload_pack, 1, 1 },
451 { "receive-pack", "receivepack", receive_pack, 0, 1 },
452};
453static void enable_service(const char *name, int ena)
455{
456 int i;
457 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
458 if (!strcmp(daemon_service[i].name, name)) {
459 daemon_service[i].enabled = ena;
460 return;
461 }
462 }
463 die("No such service %s", name);
464}
465static void make_service_overridable(const char *name, int ena)
467{
468 int i;
469 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
470 if (!strcmp(daemon_service[i].name, name)) {
471 daemon_service[i].overridable = ena;
472 return;
473 }
474 }
475 die("No such service %s", name);
476}
477static char *xstrdup_tolower(const char *str)
479{
480 char *p, *dup = xstrdup(str);
481 for (p = dup; *p; p++)
482 *p = tolower(*p);
483 return dup;
484}
485static void parse_host_and_port(char *hostport, char **host,
487 char **port)
488{
489 if (*hostport == '[') {
490 char *end;
491 end = strchr(hostport, ']');
493 if (!end)
494 die("Invalid request ('[' without ']')");
495 *end = '\0';
496 *host = hostport + 1;
497 if (!end[1])
498 *port = NULL;
499 else if (end[1] == ':')
500 *port = end + 2;
501 else
502 die("Garbage after end of host part");
503 } else {
504 *host = hostport;
505 *port = strrchr(hostport, ':');
506 if (*port) {
507 **port = '\0';
508 ++*port;
509 }
510 }
511}
512/*
514 * Read the host as supplied by the client connection.
515 */
516static void parse_host_arg(char *extra_args, int buflen)
517{
518 char *val;
519 int vallen;
520 char *end = extra_args + buflen;
521 if (extra_args < end && *extra_args) {
523 saw_extended_args = 1;
524 if (strncasecmp("host=", extra_args, 5) == 0) {
525 val = extra_args + 5;
526 vallen = strlen(val) + 1;
527 if (*val) {
528 /* Split <host>:<port> at colon. */
529 char *host;
530 char *port;
531 parse_host_and_port(val, &host, &port);
532 if (port) {
533 free(tcp_port);
534 tcp_port = xstrdup(port);
535 }
536 free(hostname);
537 hostname = xstrdup_tolower(host);
538 }
539 /* On to the next one */
541 extra_args = val + vallen;
542 }
543 if (extra_args < end && *extra_args)
544 die("Invalid request");
545 }
546 /*
548 * Locate canonical hostname and its IP address.
549 */
550 if (hostname) {
551#ifndef NO_IPV6
552 struct addrinfo hints;
553 struct addrinfo *ai;
554 int gai;
555 static char addrbuf[HOST_NAME_MAX + 1];
556 memset(&hints, 0, sizeof(hints));
558 hints.ai_flags = AI_CANONNAME;
559 gai = getaddrinfo(hostname, NULL, &hints, &ai);
561 if (!gai) {
562 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
563 inet_ntop(AF_INET, &sin_addr->sin_addr,
565 addrbuf, sizeof(addrbuf));
566 free(ip_address);
567 ip_address = xstrdup(addrbuf);
568 free(canon_hostname);
570 canon_hostname = xstrdup(ai->ai_canonname ?
571 ai->ai_canonname : ip_address);
572 freeaddrinfo(ai);
574 }
575#else
576 struct hostent *hent;
577 struct sockaddr_in sa;
578 char **ap;
579 static char addrbuf[HOST_NAME_MAX + 1];
580 hent = gethostbyname(hostname);
582 ap = hent->h_addr_list;
584 memset(&sa, 0, sizeof sa);
585 sa.sin_family = hent->h_addrtype;
586 sa.sin_port = htons(0);
587 memcpy(&sa.sin_addr, *ap, hent->h_length);
588 inet_ntop(hent->h_addrtype, &sa.sin_addr,
590 addrbuf, sizeof(addrbuf));
591 free(canon_hostname);
593 canon_hostname = xstrdup(hent->h_name);
594 free(ip_address);
595 ip_address = xstrdup(addrbuf);
596#endif
597 }
598}
599static int execute(void)
602{
603 char *line = packet_buffer;
604 int pktlen, len, i;
605 char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT");
606 if (addr)
608 loginfo("Connection from %s:%s", addr, port);
609 alarm(init_timeout ? init_timeout : timeout);
611 pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0);
612 alarm(0);
613 len = strlen(line);
615 if (pktlen != len)
616 loginfo("Extended attributes (%d bytes) exist <%.*s>",
617 (int) pktlen - len,
618 (int) pktlen - len, line + len + 1);
619 if (len && line[len-1] == '\n') {
620 line[--len] = 0;
621 pktlen--;
622 }
623 free(hostname);
625 free(canon_hostname);
626 free(ip_address);
627 free(tcp_port);
628 hostname = canon_hostname = ip_address = tcp_port = NULL;
629 if (len != pktlen)
631 parse_host_arg(line + len + 1, pktlen - len - 1);
632 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
634 struct daemon_service *s = &(daemon_service[i]);
635 int namelen = strlen(s->name);
636 if (!prefixcmp(line, "git-") &&
637 !strncmp(s->name, line + 4, namelen) &&
638 line[namelen + 4] == ' ') {
639 /*
640 * Note: The directory here is probably context sensitive,
641 * and might depend on the actual service being performed.
642 */
643 return run_service(line + namelen + 5, s);
644 }
645 }
646 logerror("Protocol error: '%s'", line);
648 return -1;
649}
650static int addrcmp(const struct sockaddr_storage *s1,
652 const struct sockaddr_storage *s2)
653{
654 const struct sockaddr *sa1 = (const struct sockaddr*) s1;
655 const struct sockaddr *sa2 = (const struct sockaddr*) s2;
656 if (sa1->sa_family != sa2->sa_family)
658 return sa1->sa_family - sa2->sa_family;
659 if (sa1->sa_family == AF_INET)
660 return memcmp(&((struct sockaddr_in *)s1)->sin_addr,
661 &((struct sockaddr_in *)s2)->sin_addr,
662 sizeof(struct in_addr));
663#ifndef NO_IPV6
664 if (sa1->sa_family == AF_INET6)
665 return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr,
666 &((struct sockaddr_in6 *)s2)->sin6_addr,
667 sizeof(struct in6_addr));
668#endif
669 return 0;
670}
671static int max_connections = 32;
673static unsigned int live_children;
675static struct child {
677 struct child *next;
678 struct child_process cld;
679 struct sockaddr_storage address;
680} *firstborn;
681static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen)
683{
684 struct child *newborn, **cradle;
685 newborn = xcalloc(1, sizeof(*newborn));
687 live_children++;
688 memcpy(&newborn->cld, cld, sizeof(*cld));
689 memcpy(&newborn->address, addr, addrlen);
690 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
691 if (!addrcmp(&(*cradle)->address, &newborn->address))
692 break;
693 newborn->next = *cradle;
694 *cradle = newborn;
695}
696/*
698 * This gets called if the number of connections grows
699 * past "max_connections".
700 *
701 * We kill the newest connection from a duplicate IP.
702 */
703static void kill_some_child(void)
704{
705 const struct child *blanket, *next;
706 if (!(blanket = firstborn))
708 return;
709 for (; (next = blanket->next); blanket = next)
711 if (!addrcmp(&blanket->address, &next->address)) {
712 kill(blanket->cld.pid, SIGTERM);
713 break;
714 }
715}
716static void check_dead_children(void)
718{
719 int status;
720 pid_t pid;
721 struct child **cradle, *blanket;
723 for (cradle = &firstborn; (blanket = *cradle);)
724 if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) {
725 const char *dead = "";
726 if (status)
727 dead = " (with error)";
728 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
729 /* remove the child */
731 *cradle = blanket->next;
732 live_children--;
733 free(blanket);
734 } else
735 cradle = &blanket->next;
736}
737static char **cld_argv;
739static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
740{
741 struct child_process cld = { NULL };
742 char addrbuf[300] = "REMOTE_ADDR=", portbuf[300];
743 char *env[] = { addrbuf, portbuf, NULL };
744 if (max_connections && live_children >= max_connections) {
746 kill_some_child();
747 sleep(1); /* give it some time to die */
748 check_dead_children();
749 if (live_children >= max_connections) {
750 close(incoming);
751 logerror("Too many children, dropping connection");
752 return;
753 }
754 }
755 if (addr->sa_family == AF_INET) {
757 struct sockaddr_in *sin_addr = (void *) addr;
758 inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf + 12,
759 sizeof(addrbuf) - 12);
760 snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d",
761 ntohs(sin_addr->sin_port));
762#ifndef NO_IPV6
763 } else if (addr->sa_family == AF_INET6) {
764 struct sockaddr_in6 *sin6_addr = (void *) addr;
765 char *buf = addrbuf + 12;
767 *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
768 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf,
769 sizeof(addrbuf) - 13);
770 strcat(buf, "]");
771 snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d",
773 ntohs(sin6_addr->sin6_port));
774#endif
775 }
776 cld.env = (const char **)env;
778 cld.argv = (const char **)cld_argv;
779 cld.in = incoming;
780 cld.out = dup(incoming);
781 if (start_command(&cld))
783 logerror("unable to fork");
784 else
785 add_child(&cld, addr, addrlen);
786 close(incoming);
787}
788static void child_handler(int signo)
790{
791 /*
792 * Otherwise empty handler because systemcalls will get interrupted
793 * upon signal receipt
794 * SysV needs the handler to be rearmed
795 */
796 signal(SIGCHLD, child_handler);
797}
798static int set_reuse_addr(int sockfd)
800{
801 int on = 1;
802 if (!reuseaddr)
804 return 0;
805 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
806 &on, sizeof(on));
807}
808struct socketlist {
810 int *list;
811 size_t nr;
812 size_t alloc;
813};
814static const char *ip2str(int family, struct sockaddr *sin, socklen_t len)
816{
817#ifdef NO_IPV6
818 static char ip[INET_ADDRSTRLEN];
819#else
820 static char ip[INET6_ADDRSTRLEN];
821#endif
822 switch (family) {
824#ifndef NO_IPV6
825 case AF_INET6:
826 inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len);
827 break;
828#endif
829 case AF_INET:
830 inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len);
831 break;
832 default:
833 strcpy(ip, "<unknown>");
834 }
835 return ip;
836}
837#ifndef NO_IPV6
839static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
841{
842 int socknum = 0;
843 int maxfd = -1;
844 char pbuf[NI_MAXSERV];
845 struct addrinfo hints, *ai0, *ai;
846 int gai;
847 long flags;
848 sprintf(pbuf, "%d", listen_port);
850 memset(&hints, 0, sizeof(hints));
851 hints.ai_family = AF_UNSPEC;
852 hints.ai_socktype = SOCK_STREAM;
853 hints.ai_protocol = IPPROTO_TCP;
854 hints.ai_flags = AI_PASSIVE;
855 gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
857 if (gai) {
858 logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai));
859 return 0;
860 }
861 for (ai = ai0; ai; ai = ai->ai_next) {
863 int sockfd;
864 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
866 if (sockfd < 0)
867 continue;
868 if (sockfd >= FD_SETSIZE) {
869 logerror("Socket descriptor too large");
870 close(sockfd);
871 continue;
872 }
873#ifdef IPV6_V6ONLY
875 if (ai->ai_family == AF_INET6) {
876 int on = 1;
877 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
878 &on, sizeof(on));
879 /* Note: error is not fatal */
880 }
881#endif
882 if (set_reuse_addr(sockfd)) {
884 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
885 close(sockfd);
886 continue;
887 }
888 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
890 logerror("Could not bind to %s: %s",
891 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
892 strerror(errno));
893 close(sockfd);
894 continue; /* not fatal */
895 }
896 if (listen(sockfd, 5) < 0) {
897 logerror("Could not listen to %s: %s",
898 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
899 strerror(errno));
900 close(sockfd);
901 continue; /* not fatal */
902 }
903 flags = fcntl(sockfd, F_GETFD, 0);
905 if (flags >= 0)
906 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
907 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
909 socklist->list[socklist->nr++] = sockfd;
910 socknum++;
911 if (maxfd < sockfd)
913 maxfd = sockfd;
914 }
915 freeaddrinfo(ai0);
917 return socknum;
919}
920#else /* NO_IPV6 */
922static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
924{
925 struct sockaddr_in sin;
926 int sockfd;
927 long flags;
928 memset(&sin, 0, sizeof sin);
930 sin.sin_family = AF_INET;
931 sin.sin_port = htons(listen_port);
932 if (listen_addr) {
934 /* Well, host better be an IP address here. */
935 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
936 return 0;
937 } else {
938 sin.sin_addr.s_addr = htonl(INADDR_ANY);
939 }
940 sockfd = socket(AF_INET, SOCK_STREAM, 0);
942 if (sockfd < 0)
943 return 0;
944 if (set_reuse_addr(sockfd)) {
946 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
947 close(sockfd);
948 return 0;
949 }
950 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
952 logerror("Could not listen to %s: %s",
953 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
954 strerror(errno));
955 close(sockfd);
956 return 0;
957 }
958 if (listen(sockfd, 5) < 0) {
960 logerror("Could not listen to %s: %s",
961 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
962 strerror(errno));
963 close(sockfd);
964 return 0;
965 }
966 flags = fcntl(sockfd, F_GETFD, 0);
968 if (flags >= 0)
969 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
970 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
972 socklist->list[socklist->nr++] = sockfd;
973 return 1;
974}
975#endif
977static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist)
979{
980 if (!listen_addr->nr)
981 setup_named_sock(NULL, listen_port, socklist);
982 else {
983 int i, socknum;
984 for (i = 0; i < listen_addr->nr; i++) {
985 socknum = setup_named_sock(listen_addr->items[i].string,
986 listen_port, socklist);
987 if (socknum == 0)
989 logerror("unable to allocate any listen sockets for host %s on port %u",
990 listen_addr->items[i].string, listen_port);
991 }
992 }
993}
994static int service_loop(struct socketlist *socklist)
996{
997 struct pollfd *pfd;
998 int i;
999 pfd = xcalloc(socklist->nr, sizeof(struct pollfd));
1001 for (i = 0; i < socklist->nr; i++) {
1003 pfd[i].fd = socklist->list[i];
1004 pfd[i].events = POLLIN;
1005 }
1006 signal(SIGCHLD, child_handler);
1008 for (;;) {
1010 int i;
1011 check_dead_children();
1013 if (poll(pfd, socklist->nr, -1) < 0) {
1015 if (errno != EINTR) {
1016 logerror("Poll failed, resuming: %s",
1017 strerror(errno));
1018 sleep(1);
1019 }
1020 continue;
1021 }
1022 for (i = 0; i < socklist->nr; i++) {
1024 if (pfd[i].revents & POLLIN) {
1025 union {
1026 struct sockaddr sa;
1027 struct sockaddr_in sai;
1028#ifndef NO_IPV6
1029 struct sockaddr_in6 sai6;
1030#endif
1031 } ss;
1032 socklen_t sslen = sizeof(ss);
1033 int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
1034 if (incoming < 0) {
1035 switch (errno) {
1036 case EAGAIN:
1037 case EINTR:
1038 case ECONNABORTED:
1039 continue;
1040 default:
1041 die_errno("accept returned");
1042 }
1043 }
1044 handle(incoming, &ss.sa, sslen);
1045 }
1046 }
1047 }
1048}
1049#ifdef NO_POSIX_GOODIES
1051struct credentials;
1053static void drop_privileges(struct credentials *cred)
1055{
1056 /* nothing */
1057}
1058static void daemonize(void)
1060{
1061 die("--detach not supported on this platform");
1062}
1063static struct credentials *prepare_credentials(const char *user_name,
1065 const char *group_name)
1066{
1067 die("--user not supported on this platform");
1068}
1069#else
1071struct credentials {
1073 struct passwd *pass;
1074 gid_t gid;
1075};
1076static void drop_privileges(struct credentials *cred)
1078{
1079 if (cred && (initgroups(cred->pass->pw_name, cred->gid) ||
1080 setgid (cred->gid) || setuid(cred->pass->pw_uid)))
1081 die("cannot drop privileges");
1082}
1083static struct credentials *prepare_credentials(const char *user_name,
1085 const char *group_name)
1086{
1087 static struct credentials c;
1088 c.pass = getpwnam(user_name);
1090 if (!c.pass)
1091 die("user not found - %s", user_name);
1092 if (!group_name)
1094 c.gid = c.pass->pw_gid;
1095 else {
1096 struct group *group = getgrnam(group_name);
1097 if (!group)
1098 die("group not found - %s", group_name);
1099 c.gid = group->gr_gid;
1101 }
1102 return &c;
1104}
1105static void daemonize(void)
1107{
1108 switch (fork()) {
1109 case 0:
1110 break;
1111 case -1:
1112 die_errno("fork failed");
1113 default:
1114 exit(0);
1115 }
1116 if (setsid() == -1)
1117 die_errno("setsid failed");
1118 close(0);
1119 close(1);
1120 close(2);
1121 sanitize_stdfds();
1122}
1123#endif
1124static void store_pid(const char *path)
1126{
1127 FILE *f = fopen(path, "w");
1128 if (!f)
1129 die_errno("cannot open pid file '%s'", path);
1130 if (fprintf(f, "%"PRIuMAX"\n", (uintmax_t) getpid()) < 0 || fclose(f) != 0)
1131 die_errno("failed to write pid file '%s'", path);
1132}
1133static int serve(struct string_list *listen_addr, int listen_port,
1135 struct credentials *cred)
1136{
1137 struct socketlist socklist = { NULL, 0, 0 };
1138 socksetup(listen_addr, listen_port, &socklist);
1140 if (socklist.nr == 0)
1141 die("unable to allocate any listen sockets on port %u",
1142 listen_port);
1143 drop_privileges(cred);
1145 loginfo("Ready to rumble");
1147 return service_loop(&socklist);
1149}
1150int main(int argc, char **argv)
1152{
1153 int listen_port = 0;
1154 struct string_list listen_addr = STRING_LIST_INIT_NODUP;
1155 int serve_mode = 0, inetd_mode = 0;
1156 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
1157 int detach = 0;
1158 struct credentials *cred = NULL;
1159 int i;
1160 git_setup_gettext();
1162 git_extract_argv0_path(argv[0]);
1164 for (i = 1; i < argc; i++) {
1166 char *arg = argv[i];
1167 if (!prefixcmp(arg, "--listen=")) {
1169 string_list_append(&listen_addr, xstrdup_tolower(arg + 9));
1170 continue;
1171 }
1172 if (!prefixcmp(arg, "--port=")) {
1173 char *end;
1174 unsigned long n;
1175 n = strtoul(arg+7, &end, 0);
1176 if (arg[7] && !*end) {
1177 listen_port = n;
1178 continue;
1179 }
1180 }
1181 if (!strcmp(arg, "--serve")) {
1182 serve_mode = 1;
1183 continue;
1184 }
1185 if (!strcmp(arg, "--inetd")) {
1186 inetd_mode = 1;
1187 log_syslog = 1;
1188 continue;
1189 }
1190 if (!strcmp(arg, "--verbose")) {
1191 verbose = 1;
1192 continue;
1193 }
1194 if (!strcmp(arg, "--syslog")) {
1195 log_syslog = 1;
1196 continue;
1197 }
1198 if (!strcmp(arg, "--export-all")) {
1199 export_all_trees = 1;
1200 continue;
1201 }
1202 if (!prefixcmp(arg, "--access-hook=")) {
1203 access_hook = arg + 14;
1204 continue;
1205 }
1206 if (!prefixcmp(arg, "--timeout=")) {
1207 timeout = atoi(arg+10);
1208 continue;
1209 }
1210 if (!prefixcmp(arg, "--init-timeout=")) {
1211 init_timeout = atoi(arg+15);
1212 continue;
1213 }
1214 if (!prefixcmp(arg, "--max-connections=")) {
1215 max_connections = atoi(arg+18);
1216 if (max_connections < 0)
1217 max_connections = 0; /* unlimited */
1218 continue;
1219 }
1220 if (!strcmp(arg, "--strict-paths")) {
1221 strict_paths = 1;
1222 continue;
1223 }
1224 if (!prefixcmp(arg, "--base-path=")) {
1225 base_path = arg+12;
1226 continue;
1227 }
1228 if (!strcmp(arg, "--base-path-relaxed")) {
1229 base_path_relaxed = 1;
1230 continue;
1231 }
1232 if (!prefixcmp(arg, "--interpolated-path=")) {
1233 interpolated_path = arg+20;
1234 continue;
1235 }
1236 if (!strcmp(arg, "--reuseaddr")) {
1237 reuseaddr = 1;
1238 continue;
1239 }
1240 if (!strcmp(arg, "--user-path")) {
1241 user_path = "";
1242 continue;
1243 }
1244 if (!prefixcmp(arg, "--user-path=")) {
1245 user_path = arg + 12;
1246 continue;
1247 }
1248 if (!prefixcmp(arg, "--pid-file=")) {
1249 pid_file = arg + 11;
1250 continue;
1251 }
1252 if (!strcmp(arg, "--detach")) {
1253 detach = 1;
1254 log_syslog = 1;
1255 continue;
1256 }
1257 if (!prefixcmp(arg, "--user=")) {
1258 user_name = arg + 7;
1259 continue;
1260 }
1261 if (!prefixcmp(arg, "--group=")) {
1262 group_name = arg + 8;
1263 continue;
1264 }
1265 if (!prefixcmp(arg, "--enable=")) {
1266 enable_service(arg + 9, 1);
1267 continue;
1268 }
1269 if (!prefixcmp(arg, "--disable=")) {
1270 enable_service(arg + 10, 0);
1271 continue;
1272 }
1273 if (!prefixcmp(arg, "--allow-override=")) {
1274 make_service_overridable(arg + 17, 1);
1275 continue;
1276 }
1277 if (!prefixcmp(arg, "--forbid-override=")) {
1278 make_service_overridable(arg + 18, 0);
1279 continue;
1280 }
1281 if (!prefixcmp(arg, "--informative-errors")) {
1282 informative_errors = 1;
1283 continue;
1284 }
1285 if (!prefixcmp(arg, "--no-informative-errors")) {
1286 informative_errors = 0;
1287 continue;
1288 }
1289 if (!strcmp(arg, "--")) {
1290 ok_paths = &argv[i+1];
1291 break;
1292 } else if (arg[0] != '-') {
1293 ok_paths = &argv[i];
1294 break;
1295 }
1296 usage(daemon_usage);
1298 }
1299 if (log_syslog) {
1301 openlog("git-daemon", LOG_PID, LOG_DAEMON);
1302 set_die_routine(daemon_die);
1303 } else
1304 /* avoid splitting a message in the middle */
1305 setvbuf(stderr, NULL, _IOFBF, 4096);
1306 if (inetd_mode && (detach || group_name || user_name))
1308 die("--detach, --user and --group are incompatible with --inetd");
1309 if (inetd_mode && (listen_port || (listen_addr.nr > 0)))
1311 die("--listen= and --port= are incompatible with --inetd");
1312 else if (listen_port == 0)
1313 listen_port = DEFAULT_GIT_PORT;
1314 if (group_name && !user_name)
1316 die("--group supplied without --user");
1317 if (user_name)
1319 cred = prepare_credentials(user_name, group_name);
1320 if (strict_paths && (!ok_paths || !*ok_paths))
1322 die("option --strict-paths requires a whitelist");
1323 if (base_path && !is_directory(base_path))
1325 die("base-path '%s' does not exist or is not a directory",
1326 base_path);
1327 if (inetd_mode) {
1329 if (!freopen("/dev/null", "w", stderr))
1330 die_errno("failed to redirect stderr to /dev/null");
1331 }
1332 if (inetd_mode || serve_mode)
1334 return execute();
1335 if (detach)
1337 daemonize();
1338 else
1339 sanitize_stdfds();
1340 if (pid_file)
1342 store_pid(pid_file);
1343 /* prepare argv for serving-processes */
1345 cld_argv = xmalloc(sizeof (char *) * (argc + 2));
1346 cld_argv[0] = argv[0]; /* git-daemon */
1347 cld_argv[1] = "--serve";
1348 for (i = 1; i < argc; ++i)
1349 cld_argv[i+1] = argv[i];
1350 cld_argv[argc+1] = NULL;
1351 return serve(&listen_addr, listen_port, cred);
1353}