4468fb9d3513a7071f904717e89e09887f6dbde1
1#include "cache.h"
2#include "pkt-line.h"
3#include "exec_cmd.h"
4#include <syslog.h>
6#ifndef HOST_NAME_MAX
8#define HOST_NAME_MAX 256
9#endif
10#ifndef NI_MAXSERV
12#define NI_MAXSERV 32
13#endif
14static int log_syslog;
16static int verbose;
17static int reuseaddr;
18static const char daemon_usage[] =
20"git daemon [--verbose] [--syslog] [--export-all]\n"
21" [--timeout=n] [--init-timeout=n] [--max-connections=n]\n"
22" [--strict-paths] [--base-path=path] [--base-path-relaxed]\n"
23" [--user-path | --user-path=path]\n"
24" [--interpolated-path=path]\n"
25" [--reuseaddr] [--detach] [--pid-file=file]\n"
26" [--[enable|disable|allow-override|forbid-override]=service]\n"
27" [--inetd | [--listen=host_or_ipaddr] [--port=n]\n"
28" [--user=user [--group=group]]\n"
29" [directory...]";
30/* List of acceptable pathname prefixes */
32static char **ok_paths;
33static int strict_paths;
34/* If this is set, git-daemon-export-ok is not required */
36static int export_all_trees;
37/* Take all paths relative to this one if non-NULL */
39static char *base_path;
40static char *interpolated_path;
41static int base_path_relaxed;
42/* Flag indicating client sent extra args. */
44static int saw_extended_args;
45/* If defined, ~user notation is allowed and the string is inserted
47 * after ~user/. E.g. a request to git://host/~alice/frotz would
48 * go to /home/alice/pub_git/frotz with --user-path=pub_git.
49 */
50static const char *user_path;
51/* Timeout, and initial timeout */
53static unsigned int timeout;
54static unsigned int init_timeout;
55static char *hostname;
57static char *canon_hostname;
58static char *ip_address;
59static char *tcp_port;
60static void logreport(int priority, const char *err, va_list params)
62{
63 if (log_syslog) {
64 char buf[1024];
65 vsnprintf(buf, sizeof(buf), err, params);
66 syslog(priority, "%s", buf);
67 } else {
68 /*
69 * Since stderr is set to linebuffered mode, the
70 * logging of different processes will not overlap
71 */
72 fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
73 vfprintf(stderr, err, params);
74 fputc('\n', stderr);
75 }
76}
77static void logerror(const char *err, ...)
79{
80 va_list params;
81 va_start(params, err);
82 logreport(LOG_ERR, err, params);
83 va_end(params);
84}
85static void loginfo(const char *err, ...)
87{
88 va_list params;
89 if (!verbose)
90 return;
91 va_start(params, err);
92 logreport(LOG_INFO, err, params);
93 va_end(params);
94}
95static void NORETURN daemon_die(const char *err, va_list params)
97{
98 logreport(LOG_ERR, err, params);
99 exit(1);
100}
101static int avoid_alias(char *p)
103{
104 int sl, ndot;
105 /*
107 * This resurrects the belts and suspenders paranoia check by HPA
108 * done in <435560F7.4080006@zytor.com> thread, now enter_repo()
109 * does not do getcwd() based path canonicalizations.
110 *
111 * sl becomes true immediately after seeing '/' and continues to
112 * be true as long as dots continue after that without intervening
113 * non-dot character.
114 */
115 if (!p || (*p != '/' && *p != '~'))
116 return -1;
117 sl = 1; ndot = 0;
118 p++;
119 while (1) {
121 char ch = *p++;
122 if (sl) {
123 if (ch == '.')
124 ndot++;
125 else if (ch == '/') {
126 if (ndot < 3)
127 /* reject //, /./ and /../ */
128 return -1;
129 ndot = 0;
130 }
131 else if (ch == 0) {
132 if (0 < ndot && ndot < 3)
133 /* reject /.$ and /..$ */
134 return -1;
135 return 0;
136 }
137 else
138 sl = ndot = 0;
139 }
140 else if (ch == 0)
141 return 0;
142 else if (ch == '/') {
143 sl = 1;
144 ndot = 0;
145 }
146 }
147}
148static char *path_ok(char *directory)
150{
151 static char rpath[PATH_MAX];
152 static char interp_path[PATH_MAX];
153 char *path;
154 char *dir;
155 dir = directory;
157 if (avoid_alias(dir)) {
159 logerror("'%s': aliased", dir);
160 return NULL;
161 }
162 if (*dir == '~') {
164 if (!user_path) {
165 logerror("'%s': User-path not allowed", dir);
166 return NULL;
167 }
168 if (*user_path) {
169 /* Got either "~alice" or "~alice/foo";
170 * rewrite them to "~alice/%s" or
171 * "~alice/%s/foo".
172 */
173 int namlen, restlen = strlen(dir);
174 char *slash = strchr(dir, '/');
175 if (!slash)
176 slash = dir + restlen;
177 namlen = slash - dir;
178 restlen -= namlen;
179 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
180 snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
181 namlen, dir, user_path, restlen, slash);
182 dir = rpath;
183 }
184 }
185 else if (interpolated_path && saw_extended_args) {
186 struct strbuf expanded_path = STRBUF_INIT;
187 struct strbuf_expand_dict_entry dict[] = {
188 { "H", hostname },
189 { "CH", canon_hostname },
190 { "IP", ip_address },
191 { "P", tcp_port },
192 { "D", directory },
193 { "%", "%" },
194 { NULL }
195 };
196 if (*dir != '/') {
198 /* Allow only absolute */
199 logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
200 return NULL;
201 }
202 strbuf_expand(&expanded_path, interpolated_path,
204 strbuf_expand_dict_cb, &dict);
205 strlcpy(interp_path, expanded_path.buf, PATH_MAX);
206 strbuf_release(&expanded_path);
207 loginfo("Interpolated dir '%s'", interp_path);
208 dir = interp_path;
210 }
211 else if (base_path) {
212 if (*dir != '/') {
213 /* Allow only absolute */
214 logerror("'%s': Non-absolute path denied (base-path active)", dir);
215 return NULL;
216 }
217 snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
218 dir = rpath;
219 }
220 path = enter_repo(dir, strict_paths);
222 if (!path && base_path && base_path_relaxed) {
223 /*
224 * if we fail and base_path_relaxed is enabled, try without
225 * prefixing the base path
226 */
227 dir = directory;
228 path = enter_repo(dir, strict_paths);
229 }
230 if (!path) {
232 logerror("'%s': unable to chdir or not a git archive", dir);
233 return NULL;
234 }
235 if ( ok_paths && *ok_paths ) {
237 char **pp;
238 int pathlen = strlen(path);
239 /* The validation is done on the paths after enter_repo
241 * appends optional {.git,.git/.git} and friends, but
242 * it does not use getcwd(). So if your /pub is
243 * a symlink to /mnt/pub, you can whitelist /pub and
244 * do not have to say /mnt/pub.
245 * Do not say /pub/.
246 */
247 for ( pp = ok_paths ; *pp ; pp++ ) {
248 int len = strlen(*pp);
249 if (len <= pathlen &&
250 !memcmp(*pp, path, len) &&
251 (path[len] == '\0' ||
252 (!strict_paths && path[len] == '/')))
253 return path;
254 }
255 }
256 else {
257 /* be backwards compatible */
258 if (!strict_paths)
259 return path;
260 }
261 logerror("'%s': not in whitelist", path);
263 return NULL; /* Fallthrough. Deny by default */
264}
265typedef int (*daemon_service_fn)(void);
267struct daemon_service {
268 const char *name;
269 const char *config_name;
270 daemon_service_fn fn;
271 int enabled;
272 int overridable;
273};
274static struct daemon_service *service_looking_at;
276static int service_enabled;
277static int git_daemon_config(const char *var, const char *value, void *cb)
279{
280 if (!prefixcmp(var, "daemon.") &&
281 !strcmp(var + 7, service_looking_at->config_name)) {
282 service_enabled = git_config_bool(var, value);
283 return 0;
284 }
285 /* we are not interested in parsing any other configuration here */
287 return 0;
288}
289static int run_service(char *dir, struct daemon_service *service)
291{
292 const char *path;
293 int enabled = service->enabled;
294 loginfo("Request %s for '%s'", service->name, dir);
296 if (!enabled && !service->overridable) {
298 logerror("'%s': service not enabled.", service->name);
299 errno = EACCES;
300 return -1;
301 }
302 if (!(path = path_ok(dir)))
304 return -1;
305 /*
307 * Security on the cheap.
308 *
309 * We want a readable HEAD, usable "objects" directory, and
310 * a "git-daemon-export-ok" flag that says that the other side
311 * is ok with us doing this.
312 *
313 * path_ok() uses enter_repo() and does whitelist checking.
314 * We only need to make sure the repository is exported.
315 */
316 if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
318 logerror("'%s': repository not exported.", path);
319 errno = EACCES;
320 return -1;
321 }
322 if (service->overridable) {
324 service_looking_at = service;
325 service_enabled = -1;
326 git_config(git_daemon_config, NULL);
327 if (0 <= service_enabled)
328 enabled = service_enabled;
329 }
330 if (!enabled) {
331 logerror("'%s': service not enabled for '%s'",
332 service->name, path);
333 errno = EACCES;
334 return -1;
335 }
336 /*
338 * We'll ignore SIGTERM from now on, we have a
339 * good client.
340 */
341 signal(SIGTERM, SIG_IGN);
342 return service->fn();
344}
345static int upload_pack(void)
347{
348 /* Timeout as string */
349 char timeout_buf[64];
350 snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
352 /* git-upload-pack only ever reads stuff, so this is safe */
354 execl_git_cmd("upload-pack", "--strict", timeout_buf, ".", NULL);
355 return -1;
356}
357static int upload_archive(void)
359{
360 execl_git_cmd("upload-archive", ".", NULL);
361 return -1;
362}
363static int receive_pack(void)
365{
366 execl_git_cmd("receive-pack", ".", NULL);
367 return -1;
368}
369static struct daemon_service daemon_service[] = {
371 { "upload-archive", "uploadarch", upload_archive, 0, 1 },
372 { "upload-pack", "uploadpack", upload_pack, 1, 1 },
373 { "receive-pack", "receivepack", receive_pack, 0, 1 },
374};
375static void enable_service(const char *name, int ena)
377{
378 int i;
379 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
380 if (!strcmp(daemon_service[i].name, name)) {
381 daemon_service[i].enabled = ena;
382 return;
383 }
384 }
385 die("No such service %s", name);
386}
387static void make_service_overridable(const char *name, int ena)
389{
390 int i;
391 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
392 if (!strcmp(daemon_service[i].name, name)) {
393 daemon_service[i].overridable = ena;
394 return;
395 }
396 }
397 die("No such service %s", name);
398}
399/*
401 * Separate the "extra args" information as supplied by the client connection.
402 */
403static void parse_extra_args(char *extra_args, int buflen)
404{
405 char *val;
406 int vallen;
407 char *end = extra_args + buflen;
408 char *hp;
409 while (extra_args < end && *extra_args) {
411 saw_extended_args = 1;
412 if (strncasecmp("host=", extra_args, 5) == 0) {
413 val = extra_args + 5;
414 vallen = strlen(val) + 1;
415 if (*val) {
416 /* Split <host>:<port> at colon. */
417 char *host = val;
418 char *port = strrchr(host, ':');
419 if (port) {
420 *port = 0;
421 port++;
422 free(tcp_port);
423 tcp_port = xstrdup(port);
424 }
425 free(hostname);
426 hostname = xstrdup(host);
427 }
428 /* On to the next one */
430 extra_args = val + vallen;
431 }
432 }
433 /*
435 * Replace literal host with lowercase-ized hostname.
436 */
437 hp = hostname;
438 if (!hp)
439 return;
440 for ( ; *hp; hp++)
441 *hp = tolower(*hp);
442 /*
444 * Locate canonical hostname and its IP address.
445 */
446#ifndef NO_IPV6
447 {
448 struct addrinfo hints;
449 struct addrinfo *ai, *ai0;
450 int gai;
451 static char addrbuf[HOST_NAME_MAX + 1];
452 memset(&hints, 0, sizeof(hints));
454 hints.ai_flags = AI_CANONNAME;
455 gai = getaddrinfo(hostname, 0, &hints, &ai0);
457 if (!gai) {
458 for (ai = ai0; ai; ai = ai->ai_next) {
459 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
460 inet_ntop(AF_INET, &sin_addr->sin_addr,
462 addrbuf, sizeof(addrbuf));
463 free(canon_hostname);
464 canon_hostname = xstrdup(ai->ai_canonname);
465 free(ip_address);
466 ip_address = xstrdup(addrbuf);
467 break;
468 }
469 freeaddrinfo(ai0);
470 }
471 }
472#else
473 {
474 struct hostent *hent;
475 struct sockaddr_in sa;
476 char **ap;
477 static char addrbuf[HOST_NAME_MAX + 1];
478 hent = gethostbyname(hostname);
480 ap = hent->h_addr_list;
482 memset(&sa, 0, sizeof sa);
483 sa.sin_family = hent->h_addrtype;
484 sa.sin_port = htons(0);
485 memcpy(&sa.sin_addr, *ap, hent->h_length);
486 inet_ntop(hent->h_addrtype, &sa.sin_addr,
488 addrbuf, sizeof(addrbuf));
489 free(canon_hostname);
491 canon_hostname = xstrdup(hent->h_name);
492 free(ip_address);
493 ip_address = xstrdup(addrbuf);
494 }
495#endif
496}
497static int execute(struct sockaddr *addr)
500{
501 static char line[1000];
502 int pktlen, len, i;
503 if (addr) {
505 char addrbuf[256] = "";
506 int port = -1;
507 if (addr->sa_family == AF_INET) {
509 struct sockaddr_in *sin_addr = (void *) addr;
510 inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf));
511 port = ntohs(sin_addr->sin_port);
512#ifndef NO_IPV6
513 } else if (addr && addr->sa_family == AF_INET6) {
514 struct sockaddr_in6 *sin6_addr = (void *) addr;
515 char *buf = addrbuf;
517 *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
518 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 1);
519 strcat(buf, "]");
520 port = ntohs(sin6_addr->sin6_port);
522#endif
523 }
524 loginfo("Connection from %s:%d", addrbuf, port);
525 setenv("REMOTE_ADDR", addrbuf, 1);
526 }
527 else {
528 unsetenv("REMOTE_ADDR");
529 }
530 alarm(init_timeout ? init_timeout : timeout);
532 pktlen = packet_read_line(0, line, sizeof(line));
533 alarm(0);
534 len = strlen(line);
536 if (pktlen != len)
537 loginfo("Extended attributes (%d bytes) exist <%.*s>",
538 (int) pktlen - len,
539 (int) pktlen - len, line + len + 1);
540 if (len && line[len-1] == '\n') {
541 line[--len] = 0;
542 pktlen--;
543 }
544 free(hostname);
546 free(canon_hostname);
547 free(ip_address);
548 free(tcp_port);
549 hostname = canon_hostname = ip_address = tcp_port = NULL;
550 if (len != pktlen)
552 parse_extra_args(line + len + 1, pktlen - len - 1);
553 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
555 struct daemon_service *s = &(daemon_service[i]);
556 int namelen = strlen(s->name);
557 if (!prefixcmp(line, "git-") &&
558 !strncmp(s->name, line + 4, namelen) &&
559 line[namelen + 4] == ' ') {
560 /*
561 * Note: The directory here is probably context sensitive,
562 * and might depend on the actual service being performed.
563 */
564 return run_service(line + namelen + 5, s);
565 }
566 }
567 logerror("Protocol error: '%s'", line);
569 return -1;
570}
571static int max_connections = 32;
573static unsigned int live_children;
575static struct child {
577 struct child *next;
578 pid_t pid;
579 struct sockaddr_storage address;
580} *firstborn;
581static void add_child(pid_t pid, struct sockaddr *addr, int addrlen)
583{
584 struct child *newborn, **cradle;
585 /*
587 * This must be xcalloc() -- we'll compare the whole sockaddr_storage
588 * but individual address may be shorter.
589 */
590 newborn = xcalloc(1, sizeof(*newborn));
591 live_children++;
592 newborn->pid = pid;
593 memcpy(&newborn->address, addr, addrlen);
594 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
595 if (!memcmp(&(*cradle)->address, &newborn->address,
596 sizeof(newborn->address)))
597 break;
598 newborn->next = *cradle;
599 *cradle = newborn;
600}
601static void remove_child(pid_t pid)
603{
604 struct child **cradle, *blanket;
605 for (cradle = &firstborn; (blanket = *cradle); cradle = &blanket->next)
607 if (blanket->pid == pid) {
608 *cradle = blanket->next;
609 live_children--;
610 free(blanket);
611 break;
612 }
613}
614/*
616 * This gets called if the number of connections grows
617 * past "max_connections".
618 *
619 * We kill the newest connection from a duplicate IP.
620 */
621static void kill_some_child(void)
622{
623 const struct child *blanket, *next;
624 if (!(blanket = firstborn))
626 return;
627 for (; (next = blanket->next); blanket = next)
629 if (!memcmp(&blanket->address, &next->address,
630 sizeof(next->address))) {
631 kill(blanket->pid, SIGTERM);
632 break;
633 }
634}
635static void check_dead_children(void)
637{
638 int status;
639 pid_t pid;
640 while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
642 const char *dead = "";
643 remove_child(pid);
644 if (!WIFEXITED(status) || (WEXITSTATUS(status) > 0))
645 dead = " (with error)";
646 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
647 }
648}
649static void handle(int incoming, struct sockaddr *addr, int addrlen)
651{
652 pid_t pid;
653 if (max_connections && live_children >= max_connections) {
655 kill_some_child();
656 sleep(1); /* give it some time to die */
657 check_dead_children();
658 if (live_children >= max_connections) {
659 close(incoming);
660 logerror("Too many children, dropping connection");
661 return;
662 }
663 }
664 if ((pid = fork())) {
666 close(incoming);
667 if (pid < 0) {
668 logerror("Couldn't fork %s", strerror(errno));
669 return;
670 }
671 add_child(pid, addr, addrlen);
673 return;
674 }
675 dup2(incoming, 0);
677 dup2(incoming, 1);
678 close(incoming);
679 exit(execute(addr));
681}
682static void child_handler(int signo)
684{
685 /*
686 * Otherwise empty handler because systemcalls will get interrupted
687 * upon signal receipt
688 * SysV needs the handler to be rearmed
689 */
690 signal(SIGCHLD, child_handler);
691}
692static int set_reuse_addr(int sockfd)
694{
695 int on = 1;
696 if (!reuseaddr)
698 return 0;
699 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
700 &on, sizeof(on));
701}
702#ifndef NO_IPV6
704static int socksetup(char *listen_addr, int listen_port, int **socklist_p)
706{
707 int socknum = 0, *socklist = NULL;
708 int maxfd = -1;
709 char pbuf[NI_MAXSERV];
710 struct addrinfo hints, *ai0, *ai;
711 int gai;
712 long flags;
713 sprintf(pbuf, "%d", listen_port);
715 memset(&hints, 0, sizeof(hints));
716 hints.ai_family = AF_UNSPEC;
717 hints.ai_socktype = SOCK_STREAM;
718 hints.ai_protocol = IPPROTO_TCP;
719 hints.ai_flags = AI_PASSIVE;
720 gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
722 if (gai)
723 die("getaddrinfo() failed: %s\n", gai_strerror(gai));
724 for (ai = ai0; ai; ai = ai->ai_next) {
726 int sockfd;
727 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
729 if (sockfd < 0)
730 continue;
731 if (sockfd >= FD_SETSIZE) {
732 logerror("Socket descriptor too large");
733 close(sockfd);
734 continue;
735 }
736#ifdef IPV6_V6ONLY
738 if (ai->ai_family == AF_INET6) {
739 int on = 1;
740 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
741 &on, sizeof(on));
742 /* Note: error is not fatal */
743 }
744#endif
745 if (set_reuse_addr(sockfd)) {
747 close(sockfd);
748 continue;
749 }
750 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
752 close(sockfd);
753 continue; /* not fatal */
754 }
755 if (listen(sockfd, 5) < 0) {
756 close(sockfd);
757 continue; /* not fatal */
758 }
759 flags = fcntl(sockfd, F_GETFD, 0);
761 if (flags >= 0)
762 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
763 socklist = xrealloc(socklist, sizeof(int) * (socknum + 1));
765 socklist[socknum++] = sockfd;
766 if (maxfd < sockfd)
768 maxfd = sockfd;
769 }
770 freeaddrinfo(ai0);
772 *socklist_p = socklist;
774 return socknum;
775}
776#else /* NO_IPV6 */
778static int socksetup(char *listen_addr, int listen_port, int **socklist_p)
780{
781 struct sockaddr_in sin;
782 int sockfd;
783 long flags;
784 memset(&sin, 0, sizeof sin);
786 sin.sin_family = AF_INET;
787 sin.sin_port = htons(listen_port);
788 if (listen_addr) {
790 /* Well, host better be an IP address here. */
791 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
792 return 0;
793 } else {
794 sin.sin_addr.s_addr = htonl(INADDR_ANY);
795 }
796 sockfd = socket(AF_INET, SOCK_STREAM, 0);
798 if (sockfd < 0)
799 return 0;
800 if (set_reuse_addr(sockfd)) {
802 close(sockfd);
803 return 0;
804 }
805 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
807 close(sockfd);
808 return 0;
809 }
810 if (listen(sockfd, 5) < 0) {
812 close(sockfd);
813 return 0;
814 }
815 flags = fcntl(sockfd, F_GETFD, 0);
817 if (flags >= 0)
818 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
819 *socklist_p = xmalloc(sizeof(int));
821 **socklist_p = sockfd;
822 return 1;
823}
824#endif
826static int service_loop(int socknum, int *socklist)
828{
829 struct pollfd *pfd;
830 int i;
831 pfd = xcalloc(socknum, sizeof(struct pollfd));
833 for (i = 0; i < socknum; i++) {
835 pfd[i].fd = socklist[i];
836 pfd[i].events = POLLIN;
837 }
838 signal(SIGCHLD, child_handler);
840 for (;;) {
842 int i;
843 check_dead_children();
845 if (poll(pfd, socknum, -1) < 0) {
847 if (errno != EINTR) {
848 logerror("Poll failed, resuming: %s",
849 strerror(errno));
850 sleep(1);
851 }
852 continue;
853 }
854 for (i = 0; i < socknum; i++) {
856 if (pfd[i].revents & POLLIN) {
857 struct sockaddr_storage ss;
858 unsigned int sslen = sizeof(ss);
859 int incoming = accept(pfd[i].fd, (struct sockaddr *)&ss, &sslen);
860 if (incoming < 0) {
861 switch (errno) {
862 case EAGAIN:
863 case EINTR:
864 case ECONNABORTED:
865 continue;
866 default:
867 die("accept returned %s", strerror(errno));
868 }
869 }
870 handle(incoming, (struct sockaddr *)&ss, sslen);
871 }
872 }
873 }
874}
875/* if any standard file descriptor is missing open it to /dev/null */
877static void sanitize_stdfds(void)
878{
879 int fd = open("/dev/null", O_RDWR, 0);
880 while (fd != -1 && fd < 2)
881 fd = dup(fd);
882 if (fd == -1)
883 die("open /dev/null or dup failed: %s", strerror(errno));
884 if (fd > 2)
885 close(fd);
886}
887static void daemonize(void)
889{
890 switch (fork()) {
891 case 0:
892 break;
893 case -1:
894 die("fork failed: %s", strerror(errno));
895 default:
896 exit(0);
897 }
898 if (setsid() == -1)
899 die("setsid failed: %s", strerror(errno));
900 close(0);
901 close(1);
902 close(2);
903 sanitize_stdfds();
904}
905static void store_pid(const char *path)
907{
908 FILE *f = fopen(path, "w");
909 if (!f)
910 die("cannot open pid file %s: %s", path, strerror(errno));
911 if (fprintf(f, "%"PRIuMAX"\n", (uintmax_t) getpid()) < 0 || fclose(f) != 0)
912 die("failed to write pid file %s: %s", path, strerror(errno));
913}
914static int serve(char *listen_addr, int listen_port, struct passwd *pass, gid_t gid)
916{
917 int socknum, *socklist;
918 socknum = socksetup(listen_addr, listen_port, &socklist);
920 if (socknum == 0)
921 die("unable to allocate any listen sockets on host %s port %u",
922 listen_addr, listen_port);
923 if (pass && gid &&
925 (initgroups(pass->pw_name, gid) || setgid (gid) ||
926 setuid(pass->pw_uid)))
927 die("cannot drop privileges");
928 return service_loop(socknum, socklist);
930}
931int main(int argc, char **argv)
933{
934 int listen_port = 0;
935 char *listen_addr = NULL;
936 int inetd_mode = 0;
937 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
938 int detach = 0;
939 struct passwd *pass = NULL;
940 struct group *group;
941 gid_t gid = 0;
942 int i;
943 for (i = 1; i < argc; i++) {
945 char *arg = argv[i];
946 if (!prefixcmp(arg, "--listen=")) {
948 char *p = arg + 9;
949 char *ph = listen_addr = xmalloc(strlen(arg + 9) + 1);
950 while (*p)
951 *ph++ = tolower(*p++);
952 *ph = 0;
953 continue;
954 }
955 if (!prefixcmp(arg, "--port=")) {
956 char *end;
957 unsigned long n;
958 n = strtoul(arg+7, &end, 0);
959 if (arg[7] && !*end) {
960 listen_port = n;
961 continue;
962 }
963 }
964 if (!strcmp(arg, "--inetd")) {
965 inetd_mode = 1;
966 log_syslog = 1;
967 continue;
968 }
969 if (!strcmp(arg, "--verbose")) {
970 verbose = 1;
971 continue;
972 }
973 if (!strcmp(arg, "--syslog")) {
974 log_syslog = 1;
975 continue;
976 }
977 if (!strcmp(arg, "--export-all")) {
978 export_all_trees = 1;
979 continue;
980 }
981 if (!prefixcmp(arg, "--timeout=")) {
982 timeout = atoi(arg+10);
983 continue;
984 }
985 if (!prefixcmp(arg, "--init-timeout=")) {
986 init_timeout = atoi(arg+15);
987 continue;
988 }
989 if (!prefixcmp(arg, "--max-connections=")) {
990 max_connections = atoi(arg+18);
991 if (max_connections < 0)
992 max_connections = 0; /* unlimited */
993 continue;
994 }
995 if (!strcmp(arg, "--strict-paths")) {
996 strict_paths = 1;
997 continue;
998 }
999 if (!prefixcmp(arg, "--base-path=")) {
1000 base_path = arg+12;
1001 continue;
1002 }
1003 if (!strcmp(arg, "--base-path-relaxed")) {
1004 base_path_relaxed = 1;
1005 continue;
1006 }
1007 if (!prefixcmp(arg, "--interpolated-path=")) {
1008 interpolated_path = arg+20;
1009 continue;
1010 }
1011 if (!strcmp(arg, "--reuseaddr")) {
1012 reuseaddr = 1;
1013 continue;
1014 }
1015 if (!strcmp(arg, "--user-path")) {
1016 user_path = "";
1017 continue;
1018 }
1019 if (!prefixcmp(arg, "--user-path=")) {
1020 user_path = arg + 12;
1021 continue;
1022 }
1023 if (!prefixcmp(arg, "--pid-file=")) {
1024 pid_file = arg + 11;
1025 continue;
1026 }
1027 if (!strcmp(arg, "--detach")) {
1028 detach = 1;
1029 log_syslog = 1;
1030 continue;
1031 }
1032 if (!prefixcmp(arg, "--user=")) {
1033 user_name = arg + 7;
1034 continue;
1035 }
1036 if (!prefixcmp(arg, "--group=")) {
1037 group_name = arg + 8;
1038 continue;
1039 }
1040 if (!prefixcmp(arg, "--enable=")) {
1041 enable_service(arg + 9, 1);
1042 continue;
1043 }
1044 if (!prefixcmp(arg, "--disable=")) {
1045 enable_service(arg + 10, 0);
1046 continue;
1047 }
1048 if (!prefixcmp(arg, "--allow-override=")) {
1049 make_service_overridable(arg + 17, 1);
1050 continue;
1051 }
1052 if (!prefixcmp(arg, "--forbid-override=")) {
1053 make_service_overridable(arg + 18, 0);
1054 continue;
1055 }
1056 if (!strcmp(arg, "--")) {
1057 ok_paths = &argv[i+1];
1058 break;
1059 } else if (arg[0] != '-') {
1060 ok_paths = &argv[i];
1061 break;
1062 }
1063 usage(daemon_usage);
1065 }
1066 if (log_syslog) {
1068 openlog("git-daemon", LOG_PID, LOG_DAEMON);
1069 set_die_routine(daemon_die);
1070 } else
1071 /* avoid splitting a message in the middle */
1072 setvbuf(stderr, NULL, _IOLBF, 0);
1073 if (inetd_mode && (group_name || user_name))
1075 die("--user and --group are incompatible with --inetd");
1076 if (inetd_mode && (listen_port || listen_addr))
1078 die("--listen= and --port= are incompatible with --inetd");
1079 else if (listen_port == 0)
1080 listen_port = DEFAULT_GIT_PORT;
1081 if (group_name && !user_name)
1083 die("--group supplied without --user");
1084 if (user_name) {
1086 pass = getpwnam(user_name);
1087 if (!pass)
1088 die("user not found - %s", user_name);
1089 if (!group_name)
1091 gid = pass->pw_gid;
1092 else {
1093 group = getgrnam(group_name);
1094 if (!group)
1095 die("group not found - %s", group_name);
1096 gid = group->gr_gid;
1098 }
1099 }
1100 if (strict_paths && (!ok_paths || !*ok_paths))
1102 die("option --strict-paths requires a whitelist");
1103 if (base_path && !is_directory(base_path))
1105 die("base-path '%s' does not exist or is not a directory",
1106 base_path);
1107 if (inetd_mode) {
1109 struct sockaddr_storage ss;
1110 struct sockaddr *peer = (struct sockaddr *)&ss;
1111 socklen_t slen = sizeof(ss);
1112 if (!freopen("/dev/null", "w", stderr))
1114 die("failed to redirect stderr to /dev/null: %s",
1115 strerror(errno));
1116 if (getpeername(0, peer, &slen))
1118 peer = NULL;
1119 return execute(peer);
1121 }
1122 if (detach) {
1124 daemonize();
1125 loginfo("Ready to rumble");
1126 }
1127 else
1128 sanitize_stdfds();
1129 if (pid_file)
1131 store_pid(pid_file);
1132 return serve(listen_addr, listen_port, pass, gid);
1134}