#include "cache.h" #include "pkt-line.h" #include "exec_cmd.h" #include "run-command.h" #include "strbuf.h" #include "string-list.h" #ifndef HOST_NAME_MAX #define HOST_NAME_MAX 256 #endif #ifdef NO_INITGROUPS #define initgroups(x, y) (0) /* nothing */ #endif static int log_syslog; static int verbose; static int reuseaddr; static int informative_errors; static const char daemon_usage[] = "git daemon [--verbose] [--syslog] [--export-all]\n" " [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n" " [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n" " [--user-path | --user-path=<path>]\n" " [--interpolated-path=<path>]\n" " [--reuseaddr] [--pid-file=<file>]\n" " [--(enable|disable|allow-override|forbid-override)=<service>]\n" " [--access-hook=<path>]\n" " [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n" " [--detach] [--user=<user> [--group=<group>]]\n" " [<directory>...]"; /* List of acceptable pathname prefixes */ static char **ok_paths; static int strict_paths; /* If this is set, git-daemon-export-ok is not required */ static int export_all_trees; /* Take all paths relative to this one if non-NULL */ static const char *base_path; static const char *interpolated_path; static int base_path_relaxed; /* Flag indicating client sent extra args. */ static int saw_extended_args; /* If defined, ~user notation is allowed and the string is inserted * after ~user/. E.g. a request to git://host/~alice/frotz would * go to /home/alice/pub_git/frotz with --user-path=pub_git. */ static const char *user_path; /* Timeout, and initial timeout */ static unsigned int timeout; static unsigned int init_timeout; static char *hostname; static char *canon_hostname; static char *ip_address; static char *tcp_port; static void logreport(int priority, const char *err, va_list params) { if (log_syslog) { char buf[1024]; vsnprintf(buf, sizeof(buf), err, params); syslog(priority, "%s", buf); } else { /* * Since stderr is set to buffered mode, the * logging of different processes will not overlap * unless they overflow the (rather big) buffers. */ fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid()); vfprintf(stderr, err, params); fputc('\n', stderr); fflush(stderr); } } __attribute__((format (printf, 1, 2))) static void logerror(const char *err, ...) { va_list params; va_start(params, err); logreport(LOG_ERR, err, params); va_end(params); } __attribute__((format (printf, 1, 2))) static void loginfo(const char *err, ...) { va_list params; if (!verbose) return; va_start(params, err); logreport(LOG_INFO, err, params); va_end(params); } static void NORETURN daemon_die(const char *err, va_list params) { logreport(LOG_ERR, err, params); exit(1); } static const char *path_ok(const char *directory) { static char rpath[PATH_MAX]; static char interp_path[PATH_MAX]; const char *path; const char *dir; dir = directory; if (daemon_avoid_alias(dir)) { logerror("'%s': aliased", dir); return NULL; } if (*dir == '~') { if (!user_path) { logerror("'%s': User-path not allowed", dir); return NULL; } if (*user_path) { /* Got either "~alice" or "~alice/foo"; * rewrite them to "~alice/%s" or * "~alice/%s/foo". */ int namlen, restlen = strlen(dir); const char *slash = strchr(dir, '/'); if (!slash) slash = dir + restlen; namlen = slash - dir; restlen -= namlen; loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash); snprintf(rpath, PATH_MAX, "%.*s/%s%.*s", namlen, dir, user_path, restlen, slash); dir = rpath; } } else if (interpolated_path && saw_extended_args) { struct strbuf expanded_path = STRBUF_INIT; struct strbuf_expand_dict_entry dict[6]; dict[0].placeholder = "H"; dict[0].value = hostname; dict[1].placeholder = "CH"; dict[1].value = canon_hostname; dict[2].placeholder = "IP"; dict[2].value = ip_address; dict[3].placeholder = "P"; dict[3].value = tcp_port; dict[4].placeholder = "D"; dict[4].value = directory; dict[5].placeholder = NULL; dict[5].value = NULL; if (*dir != '/') { /* Allow only absolute */ logerror("'%s': Non-absolute path denied (interpolated-path active)", dir); return NULL; } strbuf_expand(&expanded_path, interpolated_path, strbuf_expand_dict_cb, &dict); strlcpy(interp_path, expanded_path.buf, PATH_MAX); strbuf_release(&expanded_path); loginfo("Interpolated dir '%s'", interp_path); dir = interp_path; } else if (base_path) { if (*dir != '/') { /* Allow only absolute */ logerror("'%s': Non-absolute path denied (base-path active)", dir); return NULL; } snprintf(rpath, PATH_MAX, "%s%s", base_path, dir); dir = rpath; } path = enter_repo(dir, strict_paths); if (!path && base_path && base_path_relaxed) { /* * if we fail and base_path_relaxed is enabled, try without * prefixing the base path */ dir = directory; path = enter_repo(dir, strict_paths); } if (!path) { logerror("'%s' does not appear to be a git repository", dir); return NULL; } if ( ok_paths && *ok_paths ) { char **pp; int pathlen = strlen(path); /* The validation is done on the paths after enter_repo * appends optional {.git,.git/.git} and friends, but * it does not use getcwd(). So if your /pub is * a symlink to /mnt/pub, you can whitelist /pub and * do not have to say /mnt/pub. * Do not say /pub/. */ for ( pp = ok_paths ; *pp ; pp++ ) { int len = strlen(*pp); if (len <= pathlen && !memcmp(*pp, path, len) && (path[len] == '\0' || (!strict_paths && path[len] == '/'))) return path; } } else { /* be backwards compatible */ if (!strict_paths) return path; } logerror("'%s': not in whitelist", path); return NULL; /* Fallthrough. Deny by default */ } typedef int (*daemon_service_fn)(void); struct daemon_service { const char *name; const char *config_name; daemon_service_fn fn; int enabled; int overridable; }; static int daemon_error(const char *dir, const char *msg) { if (!informative_errors) msg = "access denied or repository not exported"; packet_write(1, "ERR %s: %s", msg, dir); return -1; } static const char *access_hook; static int run_access_hook(struct daemon_service *service, const char *dir, const char *path) { struct child_process child = CHILD_PROCESS_INIT; struct strbuf buf = STRBUF_INIT; const char *argv[8]; const char **arg = argv; char *eol; int seen_errors = 0; #define STRARG(x) ((x) ? (x) : "") *arg++ = access_hook; *arg++ = service->name; *arg++ = path; *arg++ = STRARG(hostname); *arg++ = STRARG(canon_hostname); *arg++ = STRARG(ip_address); *arg++ = STRARG(tcp_port); *arg = NULL; #undef STRARG child.use_shell = 1; child.argv = argv; child.no_stdin = 1; child.no_stderr = 1; child.out = -1; if (start_command(&child)) { logerror("daemon access hook '%s' failed to start", access_hook); goto error_return; } if (strbuf_read(&buf, child.out, 0) < 0) { logerror("failed to read from pipe to daemon access hook '%s'", access_hook); strbuf_reset(&buf); seen_errors = 1; } if (close(child.out) < 0) { logerror("failed to close pipe to daemon access hook '%s'", access_hook); seen_errors = 1; } if (finish_command(&child)) seen_errors = 1; if (!seen_errors) { strbuf_release(&buf); return 0; } error_return: strbuf_ltrim(&buf); if (!buf.len) strbuf_addstr(&buf, "service rejected"); eol = strchr(buf.buf, '\n'); if (eol) *eol = '\0'; errno = EACCES; daemon_error(dir, buf.buf); strbuf_release(&buf); return -1; } static int run_service(const char *dir, struct daemon_service *service) { const char *path; int enabled = service->enabled; struct strbuf var = STRBUF_INIT; loginfo("Request %s for '%s'", service->name, dir); if (!enabled && !service->overridable) { logerror("'%s': service not enabled.", service->name); errno = EACCES; return daemon_error(dir, "service not enabled"); } if (!(path = path_ok(dir))) return daemon_error(dir, "no such repository"); /* * Security on the cheap. * * We want a readable HEAD, usable "objects" directory, and * a "git-daemon-export-ok" flag that says that the other side * is ok with us doing this. * * path_ok() uses enter_repo() and does whitelist checking. * We only need to make sure the repository is exported. */ if (!export_all_trees && access("git-daemon-export-ok", F_OK)) { logerror("'%s': repository not exported.", path); errno = EACCES; return daemon_error(dir, "repository not exported"); } if (service->overridable) { strbuf_addf(&var, "daemon.%s", service->config_name); git_config_get_bool(var.buf, &enabled); strbuf_release(&var); } if (!enabled) { logerror("'%s': service not enabled for '%s'", service->name, path); errno = EACCES; return daemon_error(dir, "service not enabled"); } /* * Optionally, a hook can choose to deny access to the * repository depending on the phase of the moon. */ if (access_hook && run_access_hook(service, dir, path)) return -1; /* * We'll ignore SIGTERM from now on, we have a * good client. */ signal(SIGTERM, SIG_IGN); return service->fn(); } static void copy_to_log(int fd) { struct strbuf line = STRBUF_INIT; FILE *fp; fp = fdopen(fd, "r"); if (fp == NULL) { logerror("fdopen of error channel failed"); close(fd); return; } while (strbuf_getline(&line, fp, '\n') != EOF) { logerror("%s", line.buf); strbuf_setlen(&line, 0); } strbuf_release(&line); fclose(fp); } static int run_service_command(const char **argv) { struct child_process cld = CHILD_PROCESS_INIT; cld.argv = argv; cld.git_cmd = 1; cld.err = -1; if (start_command(&cld)) return -1; close(0); close(1); copy_to_log(cld.err); return finish_command(&cld); } static int upload_pack(void) { /* Timeout as string */ char timeout_buf[64]; const char *argv[] = { "upload-pack", "--strict", NULL, ".", NULL }; argv[2] = timeout_buf; snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout); return run_service_command(argv); } static int upload_archive(void) { static const char *argv[] = { "upload-archive", ".", NULL }; return run_service_command(argv); } static int receive_pack(void) { static const char *argv[] = { "receive-pack", ".", NULL }; return run_service_command(argv); } static struct daemon_service daemon_service[] = { { "upload-archive", "uploadarch", upload_archive, 0, 1 }, { "upload-pack", "uploadpack", upload_pack, 1, 1 }, { "receive-pack", "receivepack", receive_pack, 0, 1 }, }; static void enable_service(const char *name, int ena) { int i; for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { if (!strcmp(daemon_service[i].name, name)) { daemon_service[i].enabled = ena; return; } } die("No such service %s", name); } static void make_service_overridable(const char *name, int ena) { int i; for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { if (!strcmp(daemon_service[i].name, name)) { daemon_service[i].overridable = ena; return; } } die("No such service %s", name); } static void parse_host_and_port(char *hostport, char **host, char **port) { if (*hostport == '[') { char *end; end = strchr(hostport, ']'); if (!end) die("Invalid request ('[' without ']')"); *end = '\0'; *host = hostport + 1; if (!end[1]) *port = NULL; else if (end[1] == ':') *port = end + 2; else die("Garbage after end of host part"); } else { *host = hostport; *port = strrchr(hostport, ':'); if (*port) { **port = '\0'; ++*port; } } } /* * Read the host as supplied by the client connection. */ static void parse_host_arg(char *extra_args, int buflen) { char *val; int vallen; char *end = extra_args + buflen; if (extra_args < end && *extra_args) { saw_extended_args = 1; if (strncasecmp("host=", extra_args, 5) == 0) { val = extra_args + 5; vallen = strlen(val) + 1; if (*val) { /* Split <host>:<port> at colon. */ char *host; char *port; parse_host_and_port(val, &host, &port); if (port) { free(tcp_port); tcp_port = xstrdup(port); } free(hostname); hostname = xstrdup_tolower(host); } /* On to the next one */ extra_args = val + vallen; } if (extra_args < end && *extra_args) die("Invalid request"); } /* * Locate canonical hostname and its IP address. */ if (hostname) { #ifndef NO_IPV6 struct addrinfo hints; struct addrinfo *ai; int gai; static char addrbuf[HOST_NAME_MAX + 1]; memset(&hints, 0, sizeof(hints)); hints.ai_flags = AI_CANONNAME; gai = getaddrinfo(hostname, NULL, &hints, &ai); if (!gai) { struct sockaddr_in *sin_addr = (void *)ai->ai_addr; inet_ntop(AF_INET, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf)); free(ip_address); ip_address = xstrdup(addrbuf); free(canon_hostname); canon_hostname = xstrdup(ai->ai_canonname ? ai->ai_canonname : ip_address); freeaddrinfo(ai); } #else struct hostent *hent; struct sockaddr_in sa; char **ap; static char addrbuf[HOST_NAME_MAX + 1]; hent = gethostbyname(hostname); if (hent) { ap = hent->h_addr_list; memset(&sa, 0, sizeof sa); sa.sin_family = hent->h_addrtype; sa.sin_port = htons(0); memcpy(&sa.sin_addr, *ap, hent->h_length); inet_ntop(hent->h_addrtype, &sa.sin_addr, addrbuf, sizeof(addrbuf)); free(canon_hostname); canon_hostname = xstrdup(hent->h_name); free(ip_address); ip_address = xstrdup(addrbuf); } #endif } } static int execute(void) { char *line = packet_buffer; int pktlen, len, i; char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT"); if (addr) loginfo("Connection from %s:%s", addr, port); alarm(init_timeout ? init_timeout : timeout); pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0); alarm(0); len = strlen(line); if (pktlen != len) loginfo("Extended attributes (%d bytes) exist <%.*s>", (int) pktlen - len, (int) pktlen - len, line + len + 1); if (len && line[len-1] == '\n') { line[--len] = 0; pktlen--; } free(hostname); free(canon_hostname); free(ip_address); free(tcp_port); hostname = canon_hostname = ip_address = tcp_port = NULL; if (len != pktlen) parse_host_arg(line + len + 1, pktlen - len - 1); for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { struct daemon_service *s = &(daemon_service[i]); const char *arg; if (skip_prefix(line, "git-", &arg) && skip_prefix(arg, s->name, &arg) && *arg++ == ' ') { /* * Note: The directory here is probably context sensitive, * and might depend on the actual service being performed. */ return run_service(arg, s); } } logerror("Protocol error: '%s'", line); return -1; } static int addrcmp(const struct sockaddr_storage *s1, const struct sockaddr_storage *s2) { const struct sockaddr *sa1 = (const struct sockaddr*) s1; const struct sockaddr *sa2 = (const struct sockaddr*) s2; if (sa1->sa_family != sa2->sa_family) return sa1->sa_family - sa2->sa_family; if (sa1->sa_family == AF_INET) return memcmp(&((struct sockaddr_in *)s1)->sin_addr, &((struct sockaddr_in *)s2)->sin_addr, sizeof(struct in_addr)); #ifndef NO_IPV6 if (sa1->sa_family == AF_INET6) return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr, &((struct sockaddr_in6 *)s2)->sin6_addr, sizeof(struct in6_addr)); #endif return 0; } static int max_connections = 32; static unsigned int live_children; static struct child { struct child *next; struct child_process cld; struct sockaddr_storage address; } *firstborn; static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen) { struct child *newborn, **cradle; newborn = xcalloc(1, sizeof(*newborn)); live_children++; memcpy(&newborn->cld, cld, sizeof(*cld)); memcpy(&newborn->address, addr, addrlen); for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next) if (!addrcmp(&(*cradle)->address, &newborn->address)) break; newborn->next = *cradle; *cradle = newborn; } /* * This gets called if the number of connections grows * past "max_connections". * * We kill the newest connection from a duplicate IP. */ static void kill_some_child(void) { const struct child *blanket, *next; if (!(blanket = firstborn)) return; for (; (next = blanket->next); blanket = next) if (!addrcmp(&blanket->address, &next->address)) { kill(blanket->cld.pid, SIGTERM); break; } } static void check_dead_children(void) { int status; pid_t pid; struct child **cradle, *blanket; for (cradle = &firstborn; (blanket = *cradle);) if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) { const char *dead = ""; if (status) dead = " (with error)"; loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead); /* remove the child */ *cradle = blanket->next; live_children--; free(blanket); } else cradle = &blanket->next; } static char **cld_argv; static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen) { struct child_process cld = CHILD_PROCESS_INIT; char addrbuf[300] = "REMOTE_ADDR=", portbuf[300]; char *env[] = { addrbuf, portbuf, NULL }; if (max_connections && live_children >= max_connections) { kill_some_child(); sleep(1); /* give it some time to die */ check_dead_children(); if (live_children >= max_connections) { close(incoming); logerror("Too many children, dropping connection"); return; } } if (addr->sa_family == AF_INET) { struct sockaddr_in *sin_addr = (void *) addr; inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf + 12, sizeof(addrbuf) - 12); snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d", ntohs(sin_addr->sin_port)); #ifndef NO_IPV6 } else if (addr->sa_family == AF_INET6) { struct sockaddr_in6 *sin6_addr = (void *) addr; char *buf = addrbuf + 12; *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */ inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 13); strcat(buf, "]"); snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d", ntohs(sin6_addr->sin6_port)); #endif } cld.env = (const char **)env; cld.argv = (const char **)cld_argv; cld.in = incoming; cld.out = dup(incoming); if (start_command(&cld)) logerror("unable to fork"); else add_child(&cld, addr, addrlen); } static void child_handler(int signo) { /* * Otherwise empty handler because systemcalls will get interrupted * upon signal receipt * SysV needs the handler to be rearmed */ signal(SIGCHLD, child_handler); } static int set_reuse_addr(int sockfd) { int on = 1; if (!reuseaddr) return 0; return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); } struct socketlist { int *list; size_t nr; size_t alloc; }; static const char *ip2str(int family, struct sockaddr *sin, socklen_t len) { #ifdef NO_IPV6 static char ip[INET_ADDRSTRLEN]; #else static char ip[INET6_ADDRSTRLEN]; #endif switch (family) { #ifndef NO_IPV6 case AF_INET6: inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len); break; #endif case AF_INET: inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len); break; default: strcpy(ip, "<unknown>"); } return ip; } #ifndef NO_IPV6 static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist) { int socknum = 0; char pbuf[NI_MAXSERV]; struct addrinfo hints, *ai0, *ai; int gai; long flags; sprintf(pbuf, "%d", listen_port); memset(&hints, 0, sizeof(hints)); hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_STREAM; hints.ai_protocol = IPPROTO_TCP; hints.ai_flags = AI_PASSIVE; gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0); if (gai) { logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai)); return 0; } for (ai = ai0; ai; ai = ai->ai_next) { int sockfd; sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); if (sockfd < 0) continue; if (sockfd >= FD_SETSIZE) { logerror("Socket descriptor too large"); close(sockfd); continue; } #ifdef IPV6_V6ONLY if (ai->ai_family == AF_INET6) { int on = 1; setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)); /* Note: error is not fatal */ } #endif if (set_reuse_addr(sockfd)) { logerror("Could not set SO_REUSEADDR: %s", strerror(errno)); close(sockfd); continue; } if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) { logerror("Could not bind to %s: %s", ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen), strerror(errno)); close(sockfd); continue; /* not fatal */ } if (listen(sockfd, 5) < 0) { logerror("Could not listen to %s: %s", ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen), strerror(errno)); close(sockfd); continue; /* not fatal */ } flags = fcntl(sockfd, F_GETFD, 0); if (flags >= 0) fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC); ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc); socklist->list[socklist->nr++] = sockfd; socknum++; } freeaddrinfo(ai0); return socknum; } #else /* NO_IPV6 */ static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist) { struct sockaddr_in sin; int sockfd; long flags; memset(&sin, 0, sizeof sin); sin.sin_family = AF_INET; sin.sin_port = htons(listen_port); if (listen_addr) { /* Well, host better be an IP address here. */ if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0) return 0; } else { sin.sin_addr.s_addr = htonl(INADDR_ANY); } sockfd = socket(AF_INET, SOCK_STREAM, 0); if (sockfd < 0) return 0; if (set_reuse_addr(sockfd)) { logerror("Could not set SO_REUSEADDR: %s", strerror(errno)); close(sockfd); return 0; } if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) { logerror("Could not bind to %s: %s", ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)), strerror(errno)); close(sockfd); return 0; } if (listen(sockfd, 5) < 0) { logerror("Could not listen to %s: %s", ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)), strerror(errno)); close(sockfd); return 0; } flags = fcntl(sockfd, F_GETFD, 0); if (flags >= 0) fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC); ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc); socklist->list[socklist->nr++] = sockfd; return 1; } #endif static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist) { if (!listen_addr->nr) setup_named_sock(NULL, listen_port, socklist); else { int i, socknum; for (i = 0; i < listen_addr->nr; i++) { socknum = setup_named_sock(listen_addr->items[i].string, listen_port, socklist); if (socknum == 0) logerror("unable to allocate any listen sockets for host %s on port %u", listen_addr->items[i].string, listen_port); } } } static int service_loop(struct socketlist *socklist) { struct pollfd *pfd; int i; pfd = xcalloc(socklist->nr, sizeof(struct pollfd)); for (i = 0; i < socklist->nr; i++) { pfd[i].fd = socklist->list[i]; pfd[i].events = POLLIN; } signal(SIGCHLD, child_handler); for (;;) { int i; check_dead_children(); if (poll(pfd, socklist->nr, -1) < 0) { if (errno != EINTR) { logerror("Poll failed, resuming: %s", strerror(errno)); sleep(1); } continue; } for (i = 0; i < socklist->nr; i++) { if (pfd[i].revents & POLLIN) { union { struct sockaddr sa; struct sockaddr_in sai; #ifndef NO_IPV6 struct sockaddr_in6 sai6; #endif } ss; socklen_t sslen = sizeof(ss); int incoming = accept(pfd[i].fd, &ss.sa, &sslen); if (incoming < 0) { switch (errno) { case EAGAIN: case EINTR: case ECONNABORTED: continue; default: die_errno("accept returned"); } } handle(incoming, &ss.sa, sslen); } } } } #ifdef NO_POSIX_GOODIES struct credentials; static void drop_privileges(struct credentials *cred) { /* nothing */ } static struct credentials *prepare_credentials(const char *user_name, const char *group_name) { die("--user not supported on this platform"); } #else struct credentials { struct passwd *pass; gid_t gid; }; static void drop_privileges(struct credentials *cred) { if (cred && (initgroups(cred->pass->pw_name, cred->gid) || setgid (cred->gid) || setuid(cred->pass->pw_uid))) die("cannot drop privileges"); } static struct credentials *prepare_credentials(const char *user_name, const char *group_name) { static struct credentials c; c.pass = getpwnam(user_name); if (!c.pass) die("user not found - %s", user_name); if (!group_name) c.gid = c.pass->pw_gid; else { struct group *group = getgrnam(group_name); if (!group) die("group not found - %s", group_name); c.gid = group->gr_gid; } return &c; } #endif static void store_pid(const char *path) { FILE *f = fopen(path, "w"); if (!f) die_errno("cannot open pid file '%s'", path); if (fprintf(f, "%"PRIuMAX"\n", (uintmax_t) getpid()) < 0 || fclose(f) != 0) die_errno("failed to write pid file '%s'", path); } static int serve(struct string_list *listen_addr, int listen_port, struct credentials *cred) { struct socketlist socklist = { NULL, 0, 0 }; socksetup(listen_addr, listen_port, &socklist); if (socklist.nr == 0) die("unable to allocate any listen sockets on port %u", listen_port); drop_privileges(cred); loginfo("Ready to rumble"); return service_loop(&socklist); } int main(int argc, char **argv) { int listen_port = 0; struct string_list listen_addr = STRING_LIST_INIT_NODUP; int serve_mode = 0, inetd_mode = 0; const char *pid_file = NULL, *user_name = NULL, *group_name = NULL; int detach = 0; struct credentials *cred = NULL; int i; git_setup_gettext(); git_extract_argv0_path(argv[0]); for (i = 1; i < argc; i++) { char *arg = argv[i]; const char *v; if (skip_prefix(arg, "--listen=", &v)) { string_list_append(&listen_addr, xstrdup_tolower(v)); continue; } if (skip_prefix(arg, "--port=", &v)) { char *end; unsigned long n; n = strtoul(v, &end, 0); if (*v && !*end) { listen_port = n; continue; } } if (!strcmp(arg, "--serve")) { serve_mode = 1; continue; } if (!strcmp(arg, "--inetd")) { inetd_mode = 1; log_syslog = 1; continue; } if (!strcmp(arg, "--verbose")) { verbose = 1; continue; } if (!strcmp(arg, "--syslog")) { log_syslog = 1; continue; } if (!strcmp(arg, "--export-all")) { export_all_trees = 1; continue; } if (skip_prefix(arg, "--access-hook=", &v)) { access_hook = v; continue; } if (skip_prefix(arg, "--timeout=", &v)) { timeout = atoi(v); continue; } if (skip_prefix(arg, "--init-timeout=", &v)) { init_timeout = atoi(v); continue; } if (skip_prefix(arg, "--max-connections=", &v)) { max_connections = atoi(v); if (max_connections < 0) max_connections = 0; /* unlimited */ continue; } if (!strcmp(arg, "--strict-paths")) { strict_paths = 1; continue; } if (skip_prefix(arg, "--base-path=", &v)) { base_path = v; continue; } if (!strcmp(arg, "--base-path-relaxed")) { base_path_relaxed = 1; continue; } if (skip_prefix(arg, "--interpolated-path=", &v)) { interpolated_path = v; continue; } if (!strcmp(arg, "--reuseaddr")) { reuseaddr = 1; continue; } if (!strcmp(arg, "--user-path")) { user_path = ""; continue; } if (skip_prefix(arg, "--user-path=", &v)) { user_path = v; continue; } if (skip_prefix(arg, "--pid-file=", &v)) { pid_file = v; continue; } if (!strcmp(arg, "--detach")) { detach = 1; log_syslog = 1; continue; } if (skip_prefix(arg, "--user=", &v)) { user_name = v; continue; } if (skip_prefix(arg, "--group=", &v)) { group_name = v; continue; } if (skip_prefix(arg, "--enable=", &v)) { enable_service(v, 1); continue; } if (skip_prefix(arg, "--disable=", &v)) { enable_service(v, 0); continue; } if (skip_prefix(arg, "--allow-override=", &v)) { make_service_overridable(v, 1); continue; } if (skip_prefix(arg, "--forbid-override=", &v)) { make_service_overridable(v, 0); continue; } if (!strcmp(arg, "--informative-errors")) { informative_errors = 1; continue; } if (!strcmp(arg, "--no-informative-errors")) { informative_errors = 0; continue; } if (!strcmp(arg, "--")) { ok_paths = &argv[i+1]; break; } else if (arg[0] != '-') { ok_paths = &argv[i]; break; } usage(daemon_usage); } if (log_syslog) { openlog("git-daemon", LOG_PID, LOG_DAEMON); set_die_routine(daemon_die); } else /* avoid splitting a message in the middle */ setvbuf(stderr, NULL, _IOFBF, 4096); if (inetd_mode && (detach || group_name || user_name)) die("--detach, --user and --group are incompatible with --inetd"); if (inetd_mode && (listen_port || (listen_addr.nr > 0))) die("--listen= and --port= are incompatible with --inetd"); else if (listen_port == 0) listen_port = DEFAULT_GIT_PORT; if (group_name && !user_name) die("--group supplied without --user"); if (user_name) cred = prepare_credentials(user_name, group_name); if (strict_paths && (!ok_paths || !*ok_paths)) die("option --strict-paths requires a whitelist"); if (base_path && !is_directory(base_path)) die("base-path '%s' does not exist or is not a directory", base_path); if (inetd_mode) { if (!freopen("/dev/null", "w", stderr)) die_errno("failed to redirect stderr to /dev/null"); } if (inetd_mode || serve_mode) return execute(); if (detach) { if (daemonize()) die("--detach not supported on this platform"); } else sanitize_stdfds(); if (pid_file) store_pid(pid_file); /* prepare argv for serving-processes */ cld_argv = xmalloc(sizeof (char *) * (argc + 2)); cld_argv[0] = argv[0]; /* git-daemon */ cld_argv[1] = "--serve"; for (i = 1; i < argc; ++i) cld_argv[i+1] = argv[i]; cld_argv[argc+1] = NULL; return serve(&listen_addr, listen_port, cred); }