| #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 enum log_destination { |
| LOG_DESTINATION_UNSET = -1, |
| LOG_DESTINATION_NONE = 0, |
| LOG_DESTINATION_STDERR = 1, |
| LOG_DESTINATION_SYSLOG = 2, |
| } log_destination = LOG_DESTINATION_UNSET; |
| 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" |
| " [--log-destination=(stderr|syslog|none)]\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) |
| { |
| switch (log_destination) { |
| case LOG_DESTINATION_SYSLOG: { |
| char buf[1024]; |
| vsnprintf(buf, sizeof(buf), err, params); |
| syslog(priority, "%s", buf); |
| break; |
| } |
| case LOG_DESTINATION_STDERR: |
| /* |
| * 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); |
| break; |
| case LOG_DESTINATION_NONE: |
| break; |
| case LOG_DESTINATION_UNSET: |
| BUG("log destination not initialized correctly"); |
| } |
| } |
| |
| __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)(const struct argv_array *env); |
| 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 struct argv_array *env) |
| { |
| 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(env); |
| } |
| |
| 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(const struct argv_array *env) |
| { |
| struct child_process cld = CHILD_PROCESS_INIT; |
| argv_array_pushl(&cld.args, "upload-pack", "--strict", NULL); |
| argv_array_pushf(&cld.args, "--timeout=%u", timeout); |
| |
| argv_array_pushv(&cld.env_array, env->argv); |
| |
| return run_service_command(&cld); |
| } |
| |
| static int upload_archive(const struct argv_array *env) |
| { |
| struct child_process cld = CHILD_PROCESS_INIT; |
| argv_array_push(&cld.args, "upload-archive"); |
| |
| argv_array_pushv(&cld.env_array, env->argv); |
| |
| return run_service_command(&cld); |
| } |
| |
| static int receive_pack(const struct argv_array *env) |
| { |
| struct child_process cld = CHILD_PROCESS_INIT; |
| argv_array_push(&cld.args, "receive-pack"); |
| |
| argv_array_pushv(&cld.env_array, env->argv); |
| |
| 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. |
| * |
| * Returns a pointer to the character after the NUL byte terminating the host |
| * arguemnt, or 'extra_args' if there is no host arguemnt. |
| */ |
| static char *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; |
| loginfo("Extended attribute \"host\": %s", val); |
| 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"); |
| } |
| |
| return extra_args; |
| } |
| |
| static void parse_extra_args(struct hostinfo *hi, struct argv_array *env, |
| char *extra_args, int buflen) |
| { |
| const char *end = extra_args + buflen; |
| struct strbuf git_protocol = STRBUF_INIT; |
| |
| /* First look for the host argument */ |
| extra_args = parse_host_arg(hi, extra_args, buflen); |
| |
| /* Look for additional arguments places after a second NUL byte */ |
| for (; extra_args < end; extra_args += strlen(extra_args) + 1) { |
| const char *arg = extra_args; |
| |
| /* |
| * Parse the extra arguments, adding most to 'git_protocol' |
| * which will be used to set the 'GIT_PROTOCOL' envvar in the |
| * service that will be run. |
| * |
| * If there ends up being a particular arg in the future that |
| * git-daemon needs to parse specificly (like the 'host' arg) |
| * then it can be parsed here and not added to 'git_protocol'. |
| */ |
| if (*arg) { |
| if (git_protocol.len > 0) |
| strbuf_addch(&git_protocol, ':'); |
| strbuf_addstr(&git_protocol, arg); |
| } |
| } |
| |
| if (git_protocol.len > 0) { |
| loginfo("Extended attribute \"protocol\": %s", git_protocol.buf); |
| argv_array_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=%s", |
| git_protocol.buf); |
| } |
| strbuf_release(&git_protocol); |
| } |
| |
| /* |
| * 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; |
| struct argv_array env = ARGV_ARRAY_INIT; |
| |
| 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 (len && line[len-1] == '\n') |
| line[len-1] = 0; |
| |
| /* parse additional args hidden behind a NUL byte */ |
| if (len != pktlen) |
| parse_extra_args(&hi, &env, 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, &env); |
| hostinfo_clear(&hi); |
| argv_array_clear(&env); |
| return rc; |
| } |
| } |
| |
| hostinfo_clear(&hi); |
| argv_array_clear(&env); |
| 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; |
| continue; |
| } |
| if (!strcmp(arg, "--verbose")) { |
| verbose = 1; |
| continue; |
| } |
| if (!strcmp(arg, "--syslog")) { |
| log_destination = LOG_DESTINATION_SYSLOG; |
| continue; |
| } |
| if (skip_prefix(arg, "--log-destination=", &v)) { |
| if (!strcmp(v, "syslog")) { |
| log_destination = LOG_DESTINATION_SYSLOG; |
| continue; |
| } else if (!strcmp(v, "stderr")) { |
| log_destination = LOG_DESTINATION_STDERR; |
| continue; |
| } else if (!strcmp(v, "none")) { |
| log_destination = LOG_DESTINATION_NONE; |
| continue; |
| } else |
| die("unknown log destination '%s'", v); |
| } |
| 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; |
| 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_destination == LOG_DESTINATION_UNSET) { |
| if (inetd_mode || detach) |
| log_destination = LOG_DESTINATION_SYSLOG; |
| else |
| log_destination = LOG_DESTINATION_STDERR; |
| } |
| |
| if (log_destination == LOG_DESTINATION_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); |
| } |