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| #include "cache.h" | |
| #include "config.h" | |
| #include "pkt-line.h" | |
| #include "run-command.h" | |
| #include "strbuf.h" | |
| #include "string-list.h" | |
| #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 const 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; | |
| /* 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; | |
| struct hostinfo { | |
| struct strbuf hostname; | |
| struct strbuf canon_hostname; | |
| struct strbuf ip_address; | |
| struct strbuf tcp_port; | |
| unsigned int hostname_lookup_done:1; | |
| unsigned int saw_extended_args:1; | |
| }; | |
| static void lookup_hostname(struct hostinfo *hi); | |
| static const char *get_canon_hostname(struct hostinfo *hi) | |
| { | |
| lookup_hostname(hi); | |
| return hi->canon_hostname.buf; | |
| } | |
| static const char *get_ip_address(struct hostinfo *hi) | |
| { | |
| lookup_hostname(hi); | |
| return hi->ip_address.buf; | |
| } | |
| 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); | |
| } | |
| struct expand_path_context { | |
| const char *directory; | |
| struct hostinfo *hostinfo; | |
| }; | |
| static size_t expand_path(struct strbuf *sb, const char *placeholder, void *ctx) | |
| { | |
| struct expand_path_context *context = ctx; | |
| struct hostinfo *hi = context->hostinfo; | |
| switch (placeholder[0]) { | |
| case 'H': | |
| strbuf_addbuf(sb, &hi->hostname); | |
| return 1; | |
| case 'C': | |
| if (placeholder[1] == 'H') { | |
| strbuf_addstr(sb, get_canon_hostname(hi)); | |
| return 2; | |
| } | |
| break; | |
| case 'I': | |
| if (placeholder[1] == 'P') { | |
| strbuf_addstr(sb, get_ip_address(hi)); | |
| return 2; | |
| } | |
| break; | |
| case 'P': | |
| strbuf_addbuf(sb, &hi->tcp_port); | |
| return 1; | |
| case 'D': | |
| strbuf_addstr(sb, context->directory); | |
| return 1; | |
| } | |
| return 0; | |
| } | |
| static const char *path_ok(const char *directory, struct hostinfo *hi) | |
| { | |
| static char rpath[PATH_MAX]; | |
| static char interp_path[PATH_MAX]; | |
| size_t rlen; | |
| 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); | |
| rlen = snprintf(rpath, sizeof(rpath), "%.*s/%s%.*s", | |
| namlen, dir, user_path, restlen, slash); | |
| if (rlen >= sizeof(rpath)) { | |
| logerror("user-path too large: %s", rpath); | |
| return NULL; | |
| } | |
| dir = rpath; | |
| } | |
| } | |
| else if (interpolated_path && hi->saw_extended_args) { | |
| struct strbuf expanded_path = STRBUF_INIT; | |
| struct expand_path_context context; | |
| context.directory = directory; | |
| context.hostinfo = hi; | |
| if (*dir != '/') { | |
| /* Allow only absolute */ | |
| logerror("'%s': Non-absolute path denied (interpolated-path active)", dir); | |
| return NULL; | |
| } | |
| strbuf_expand(&expanded_path, interpolated_path, | |
| expand_path, &context); | |
| rlen = strlcpy(interp_path, expanded_path.buf, | |
| sizeof(interp_path)); | |
| if (rlen >= sizeof(interp_path)) { | |
| logerror("interpolated path too large: %s", | |
| interp_path); | |
| return NULL; | |
| } | |
| 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; | |
| } | |
| rlen = snprintf(rpath, sizeof(rpath), "%s%s", base_path, dir); | |
| if (rlen >= sizeof(rpath)) { | |
| logerror("base-path too large: %s", rpath); | |
| return NULL; | |
| } | |
| 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 ) { | |
| const 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_fmt(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 hostinfo *hi) | |
| { | |
| 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; | |
| *arg++ = access_hook; | |
| *arg++ = service->name; | |
| *arg++ = path; | |
| *arg++ = hi->hostname.buf; | |
| *arg++ = get_canon_hostname(hi); | |
| *arg++ = get_ip_address(hi); | |
| *arg++ = hi->tcp_port.buf; | |
| *arg = NULL; | |
| 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, | |
| struct hostinfo *hi) | |
| { | |
| 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, hi))) | |
| 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, hi)) | |
| 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_lf(&line, fp) != EOF) { | |
| logerror("%s", line.buf); | |
| strbuf_setlen(&line, 0); | |
| } | |
| strbuf_release(&line); | |
| fclose(fp); | |
| } | |
| static int run_service_command(struct child_process *cld) | |
| { | |
| argv_array_push(&cld->args, "."); | |
| 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) | |
| { | |
| struct child_process cld = CHILD_PROCESS_INIT; | |
| argv_array_pushl(&cld.args, "upload-pack", "--strict", NULL); | |
| argv_array_pushf(&cld.args, "--timeout=%u", timeout); | |
| return run_service_command(&cld); | |
| } | |
| static int upload_archive(void) | |
| { | |
| struct child_process cld = CHILD_PROCESS_INIT; | |
| argv_array_push(&cld.args, "upload-archive"); | |
| return run_service_command(&cld); | |
| } | |
| static int receive_pack(void) | |
| { | |
| struct child_process cld = CHILD_PROCESS_INIT; | |
| argv_array_push(&cld.args, "receive-pack"); | |
| return run_service_command(&cld); | |
| } | |
| 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; | |
| } | |
| } | |
| } | |
| /* | |
| * Sanitize a string from the client so that it's OK to be inserted into a | |
| * filesystem path. Specifically, we disallow slashes, runs of "..", and | |
| * trailing and leading dots, which means that the client cannot escape | |
| * our base path via ".." traversal. | |
| */ | |
| static void sanitize_client(struct strbuf *out, const char *in) | |
| { | |
| for (; *in; in++) { | |
| if (*in == '/') | |
| continue; | |
| if (*in == '.' && (!out->len || out->buf[out->len - 1] == '.')) | |
| continue; | |
| strbuf_addch(out, *in); | |
| } | |
| while (out->len && out->buf[out->len - 1] == '.') | |
| strbuf_setlen(out, out->len - 1); | |
| } | |
| /* | |
| * Like sanitize_client, but we also perform any canonicalization | |
| * to make life easier on the admin. | |
| */ | |
| static void canonicalize_client(struct strbuf *out, const char *in) | |
| { | |
| sanitize_client(out, in); | |
| strbuf_tolower(out); | |
| } | |
| /* | |
| * Read the host as supplied by the client connection. | |
| */ | |
| static void parse_host_arg(struct hostinfo *hi, char *extra_args, int buflen) | |
| { | |
| char *val; | |
| int vallen; | |
| char *end = extra_args + buflen; | |
| if (extra_args < end && *extra_args) { | |
| hi->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) | |
| sanitize_client(&hi->tcp_port, port); | |
| canonicalize_client(&hi->hostname, host); | |
| hi->hostname_lookup_done = 0; | |
| } | |
| /* 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. | |
| */ | |
| static void lookup_hostname(struct hostinfo *hi) | |
| { | |
| if (!hi->hostname_lookup_done && hi->hostname.len) { | |
| #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(hi->hostname.buf, 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)); | |
| strbuf_addstr(&hi->ip_address, addrbuf); | |
| if (ai->ai_canonname) | |
| sanitize_client(&hi->canon_hostname, | |
| ai->ai_canonname); | |
| else | |
| strbuf_addbuf(&hi->canon_hostname, | |
| &hi->ip_address); | |
| freeaddrinfo(ai); | |
| } | |
| #else | |
| struct hostent *hent; | |
| struct sockaddr_in sa; | |
| char **ap; | |
| static char addrbuf[HOST_NAME_MAX + 1]; | |
| hent = gethostbyname(hi->hostname.buf); | |
| 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)); | |
| sanitize_client(&hi->canon_hostname, hent->h_name); | |
| strbuf_addstr(&hi->ip_address, addrbuf); | |
| } | |
| #endif | |
| hi->hostname_lookup_done = 1; | |
| } | |
| } | |
| static void hostinfo_init(struct hostinfo *hi) | |
| { | |
| memset(hi, 0, sizeof(*hi)); | |
| strbuf_init(&hi->hostname, 0); | |
| strbuf_init(&hi->canon_hostname, 0); | |
| strbuf_init(&hi->ip_address, 0); | |
| strbuf_init(&hi->tcp_port, 0); | |
| } | |
| static void hostinfo_clear(struct hostinfo *hi) | |
| { | |
| strbuf_release(&hi->hostname); | |
| strbuf_release(&hi->canon_hostname); | |
| strbuf_release(&hi->ip_address); | |
| strbuf_release(&hi->tcp_port); | |
| } | |
| static void set_keep_alive(int sockfd) | |
| { | |
| int ka = 1; | |
| if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) { | |
| if (errno != ENOTSOCK) | |
| logerror("unable to set SO_KEEPALIVE on socket: %s", | |
| strerror(errno)); | |
| } | |
| } | |
| static int execute(void) | |
| { | |
| char *line = packet_buffer; | |
| int pktlen, len, i; | |
| char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT"); | |
| struct hostinfo hi; | |
| hostinfo_init(&hi); | |
| if (addr) | |
| loginfo("Connection from %s:%s", addr, port); | |
| set_keep_alive(0); | |
| 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--; | |
| } | |
| if (len != pktlen) | |
| parse_host_arg(&hi, 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. | |
| */ | |
| int rc = run_service(arg, s, &hi); | |
| hostinfo_clear(&hi); | |
| return rc; | |
| } | |
| } | |
| hostinfo_clear(&hi); | |
| 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--; | |
| child_process_clear(&blanket->cld); | |
| free(blanket); | |
| } else | |
| cradle = &blanket->next; | |
| } | |
| static struct argv_array cld_argv = ARGV_ARRAY_INIT; | |
| static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen) | |
| { | |
| struct child_process cld = CHILD_PROCESS_INIT; | |
| 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) { | |
| char buf[128] = ""; | |
| struct sockaddr_in *sin_addr = (void *) addr; | |
| inet_ntop(addr->sa_family, &sin_addr->sin_addr, buf, sizeof(buf)); | |
| argv_array_pushf(&cld.env_array, "REMOTE_ADDR=%s", buf); | |
| argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d", | |
| ntohs(sin_addr->sin_port)); | |
| #ifndef NO_IPV6 | |
| } else if (addr->sa_family == AF_INET6) { | |
| char buf[128] = ""; | |
| struct sockaddr_in6 *sin6_addr = (void *) addr; | |
| inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(buf)); | |
| argv_array_pushf(&cld.env_array, "REMOTE_ADDR=[%s]", buf); | |
| argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d", | |
| ntohs(sin6_addr->sin6_port)); | |
| #endif | |
| } | |
| cld.argv = cld_argv.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: | |
| xsnprintf(ip, sizeof(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; | |
| xsnprintf(pbuf, sizeof(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; | |
| } | |
| set_keep_alive(sockfd); | |
| 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; | |
| } | |
| set_keep_alive(sockfd); | |
| 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 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 cmd_main(int argc, const 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; | |
| for (i = 1; i < argc; i++) { | |
| const 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"); | |
| } | |
| if (pid_file) | |
| write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid()); | |
| /* prepare argv for serving-processes */ | |
| argv_array_push(&cld_argv, argv[0]); /* git-daemon */ | |
| argv_array_push(&cld_argv, "--serve"); | |
| for (i = 1; i < argc; ++i) | |
| argv_array_push(&cld_argv, argv[i]); | |
| return serve(&listen_addr, listen_port, cred); | |
| } |