#include <netinet/in.h>
#include <arpa/inet.h>
#include <syslog.h>
+#include <pwd.h>
+#include <grp.h>
+#include <limits.h>
#include "pkt-line.h"
#include "cache.h"
#include "exec_cmd.h"
+#include "interpolate.h"
+
+#ifndef HOST_NAME_MAX
+#define HOST_NAME_MAX 256
+#endif
static int log_syslog;
static int verbose;
static int reuseaddr;
static const char daemon_usage[] =
-"git-daemon [--verbose] [--syslog] [--inetd | --port=n] [--export-all]\n"
+"git-daemon [--verbose] [--syslog] [--export-all]\n"
" [--timeout=n] [--init-timeout=n] [--strict-paths]\n"
" [--base-path=path] [--user-path | --user-path=path]\n"
-" [--reuseaddr] [directory...]";
+" [--interpolated-path=path]\n"
+" [--reuseaddr] [--detach] [--pid-file=file]\n"
+" [--[enable|disable|allow-override|forbid-override]=service]\n"
+" [--inetd | [--listen=host_or_ipaddr] [--port=n]\n"
+" [--user=user [--group=group]]\n"
+" [directory...]";
/* List of acceptable pathname prefixes */
-static char **ok_paths = NULL;
-static int strict_paths = 0;
+static char **ok_paths;
+static int strict_paths;
/* If this is set, git-daemon-export-ok is not required */
-static int export_all_trees = 0;
+static int export_all_trees;
/* Take all paths relative to this one if non-NULL */
-static char *base_path = NULL;
+static char *base_path;
+static char *interpolated_path;
+
+/* 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 char *user_path = NULL;
+static const char *user_path;
/* Timeout, and initial timeout */
-static unsigned int timeout = 0;
-static unsigned int init_timeout = 0;
+static unsigned int timeout;
+static unsigned int init_timeout;
+
+/*
+ * Static table for now. Ugh.
+ * Feel free to make dynamic as needed.
+ */
+#define INTERP_SLOT_HOST (0)
+#define INTERP_SLOT_CANON_HOST (1)
+#define INTERP_SLOT_IP (2)
+#define INTERP_SLOT_PORT (3)
+#define INTERP_SLOT_DIR (4)
+#define INTERP_SLOT_PERCENT (5)
+
+static struct interp interp_table[] = {
+ { "%H", 0},
+ { "%CH", 0},
+ { "%IP", 0},
+ { "%P", 0},
+ { "%D", 0},
+ { "%%", 0},
+};
+
static void logreport(int priority, const char *err, va_list params)
{
va_end(params);
}
+static void NORETURN daemon_die(const char *err, va_list params)
+{
+ logreport(LOG_ERR, err, params);
+ exit(1);
+}
+
static int avoid_alias(char *p)
{
int sl, ndot;
}
}
-static char *path_ok(char *dir)
+static char *path_ok(struct interp *itable)
{
static char rpath[PATH_MAX];
+ static char interp_path[PATH_MAX];
char *path;
+ char *dir;
+
+ dir = itable[INTERP_SLOT_DIR].value;
if (avoid_alias(dir)) {
logerror("'%s': aliased", dir);
dir = rpath;
}
}
+ else if (interpolated_path && saw_extended_args) {
+ if (*dir != '/') {
+ /* Allow only absolute */
+ logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
+ return NULL;
+ }
+
+ interpolate(interp_path, PATH_MAX, interpolated_path,
+ interp_table, ARRAY_SIZE(interp_table));
+ 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;
}
- else {
- snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
- dir = rpath;
- }
+ snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
+ dir = rpath;
}
path = enter_repo(dir, strict_paths);
return NULL; /* Fallthrough. Deny by default */
}
-static int upload(char *dir)
+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 struct daemon_service *service_looking_at;
+static int service_enabled;
+
+static int git_daemon_config(const char *var, const char *value)
+{
+ if (!strncmp(var, "daemon.", 7) &&
+ !strcmp(var + 7, service_looking_at->config_name)) {
+ service_enabled = git_config_bool(var, value);
+ return 0;
+ }
+
+ /* we are not interested in parsing any other configuration here */
+ return 0;
+}
+
+static int run_service(struct interp *itable, struct daemon_service *service)
{
- /* Timeout as string */
- char timeout_buf[64];
const char *path;
+ int enabled = service->enabled;
+
+ loginfo("Request %s for '%s'",
+ service->name,
+ itable[INTERP_SLOT_DIR].value);
- loginfo("Request for '%s'", dir);
+ if (!enabled && !service->overridable) {
+ logerror("'%s': service not enabled.", service->name);
+ errno = EACCES;
+ return -1;
+ }
- if (!(path = path_ok(dir)))
+ if (!(path = path_ok(itable)))
return -1;
/*
return -1;
}
+ if (service->overridable) {
+ service_looking_at = service;
+ service_enabled = -1;
+ git_config(git_daemon_config);
+ if (0 <= service_enabled)
+ enabled = service_enabled;
+ }
+ if (!enabled) {
+ logerror("'%s': service not enabled for '%s'",
+ service->name, path);
+ errno = EACCES;
+ return -1;
+ }
+
/*
* We'll ignore SIGTERM from now on, we have a
* good client.
*/
signal(SIGTERM, SIG_IGN);
+ return service->fn();
+}
+
+static int upload_pack(void)
+{
+ /* Timeout as string */
+ char timeout_buf[64];
+
snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
/* git-upload-pack only ever reads stuff, so this is safe */
return -1;
}
-static int execute(void)
+static int upload_archive(void)
+{
+ execl_git_cmd("upload-archive", ".", NULL);
+ return -1;
+}
+
+static struct daemon_service daemon_service[] = {
+ { "upload-archive", "uploadarch", upload_archive, 0, 1 },
+ { "upload-pack", "uploadpack", upload_pack, 1, 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);
+}
+
+/*
+ * Separate the "extra args" information as supplied by the client connection.
+ * Any resulting data is squirrelled away in the given interpolation table.
+ */
+static void parse_extra_args(struct interp *table, char *extra_args, int buflen)
+{
+ char *val;
+ int vallen;
+ char *end = extra_args + buflen;
+
+ while (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 = val;
+ char *port = strrchr(host, ':');
+ if (port) {
+ *port = 0;
+ port++;
+ interp_set_entry(table, INTERP_SLOT_PORT, port);
+ }
+ interp_set_entry(table, INTERP_SLOT_HOST, host);
+ }
+
+ /* On to the next one */
+ extra_args = val + vallen;
+ }
+ }
+}
+
+void fill_in_extra_table_entries(struct interp *itable)
+{
+ char *hp;
+
+ /*
+ * Replace literal host with lowercase-ized hostname.
+ */
+ hp = interp_table[INTERP_SLOT_HOST].value;
+ for ( ; *hp; hp++)
+ *hp = tolower(*hp);
+
+ /*
+ * Locate canonical hostname and its IP address.
+ */
+#ifndef NO_IPV6
+ {
+ struct addrinfo hints;
+ struct addrinfo *ai, *ai0;
+ int gai;
+ static char addrbuf[HOST_NAME_MAX + 1];
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_flags = AI_CANONNAME;
+
+ gai = getaddrinfo(interp_table[INTERP_SLOT_HOST].value, 0, &hints, &ai0);
+ if (!gai) {
+ for (ai = ai0; ai; ai = ai->ai_next) {
+ struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
+
+ inet_ntop(AF_INET, &sin_addr->sin_addr,
+ addrbuf, sizeof(addrbuf));
+ interp_set_entry(interp_table,
+ INTERP_SLOT_CANON_HOST, ai->ai_canonname);
+ interp_set_entry(interp_table,
+ INTERP_SLOT_IP, addrbuf);
+ break;
+ }
+ freeaddrinfo(ai0);
+ }
+ }
+#else
+ {
+ struct hostent *hent;
+ struct sockaddr_in sa;
+ char **ap;
+ static char addrbuf[HOST_NAME_MAX + 1];
+
+ hent = gethostbyname(interp_table[INTERP_SLOT_HOST].value);
+
+ 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));
+
+ interp_set_entry(interp_table, INTERP_SLOT_CANON_HOST, hent->h_name);
+ interp_set_entry(interp_table, INTERP_SLOT_IP, addrbuf);
+ }
+#endif
+}
+
+
+static int execute(struct sockaddr *addr)
{
static char line[1000];
- int pktlen, len;
+ int pktlen, len, i;
+
+ if (addr) {
+ char addrbuf[256] = "";
+ int port = -1;
+
+ if (addr->sa_family == AF_INET) {
+ struct sockaddr_in *sin_addr = (void *) addr;
+ inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf));
+ port = sin_addr->sin_port;
+#ifndef NO_IPV6
+ } else if (addr && addr->sa_family == AF_INET6) {
+ struct sockaddr_in6 *sin6_addr = (void *) addr;
+
+ char *buf = addrbuf;
+ *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
+ inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 1);
+ strcat(buf, "]");
+
+ port = sin6_addr->sin6_port;
+#endif
+ }
+ loginfo("Connection from %s:%d", addrbuf, port);
+ }
alarm(init_timeout ? init_timeout : timeout);
pktlen = packet_read_line(0, line, sizeof(line));
if (len && line[len-1] == '\n')
line[--len] = 0;
- if (!strncmp("git-upload-pack ", line, 16))
- return upload(line+16);
+ /*
+ * Initialize the path interpolation table for this connection.
+ */
+ interp_clear_table(interp_table, ARRAY_SIZE(interp_table));
+ interp_set_entry(interp_table, INTERP_SLOT_PERCENT, "%");
+
+ if (len != pktlen) {
+ parse_extra_args(interp_table, line + len + 1, pktlen - len - 1);
+ fill_in_extra_table_entries(interp_table);
+ }
+
+ for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
+ struct daemon_service *s = &(daemon_service[i]);
+ int namelen = strlen(s->name);
+ if (!strncmp("git-", line, 4) &&
+ !strncmp(s->name, line + 4, namelen) &&
+ line[namelen + 4] == ' ') {
+ /*
+ * Note: The directory here is probably context sensitive,
+ * and might depend on the actual service being performed.
+ */
+ interp_set_entry(interp_table,
+ INTERP_SLOT_DIR, line + namelen + 5);
+ return run_service(interp_table, s);
+ }
+ }
logerror("Protocol error: '%s'", line);
return -1;
static int max_connections = 25;
/* These are updated by the signal handler */
-static volatile unsigned int children_reaped = 0;
+static volatile unsigned int children_reaped;
static pid_t dead_child[MAX_CHILDREN];
/* These are updated by the main loop */
-static unsigned int children_spawned = 0;
-static unsigned int children_deleted = 0;
+static unsigned int children_spawned;
+static unsigned int children_deleted;
static struct child {
pid_t pid;
static void handle(int incoming, struct sockaddr *addr, int addrlen)
{
pid_t pid = fork();
- char addrbuf[256] = "";
- int port = -1;
if (pid) {
unsigned idx;
dup2(incoming, 1);
close(incoming);
- if (addr->sa_family == AF_INET) {
- struct sockaddr_in *sin_addr = (void *) addr;
- inet_ntop(AF_INET, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf));
- port = sin_addr->sin_port;
-
-#ifndef NO_IPV6
- } else if (addr->sa_family == AF_INET6) {
- struct sockaddr_in6 *sin6_addr = (void *) addr;
-
- char *buf = addrbuf;
- *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
- inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 1);
- strcat(buf, "]");
-
- port = sin6_addr->sin6_port;
-#endif
- }
- loginfo("Connection from %s:%d", addrbuf, port);
-
- exit(execute());
+ exit(execute(addr));
}
static void child_handler(int signo)
children_reaped = reaped + 1;
/* XXX: Custom logging, since we don't wanna getpid() */
if (verbose) {
- char *dead = "";
+ const char *dead = "";
if (!WIFEXITED(status) || WEXITSTATUS(status) > 0)
dead = " (with error)";
if (log_syslog)
#ifndef NO_IPV6
-static int socksetup(int port, int **socklist_p)
+static int socksetup(char *listen_addr, int listen_port, int **socklist_p)
{
int socknum = 0, *socklist = NULL;
int maxfd = -1;
char pbuf[NI_MAXSERV];
-
struct addrinfo hints, *ai0, *ai;
int gai;
- sprintf(pbuf, "%d", port);
+ 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(NULL, pbuf, &hints, &ai0);
+ gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
if (gai)
die("getaddrinfo() failed: %s\n", gai_strerror(gai));
for (ai = ai0; ai; ai = ai->ai_next) {
int sockfd;
- int *newlist;
sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (sockfd < 0)
continue; /* not fatal */
}
- newlist = realloc(socklist, sizeof(int) * (socknum + 1));
- if (!newlist)
- die("memory allocation failed: %s", strerror(errno));
-
- socklist = newlist;
+ socklist = xrealloc(socklist, sizeof(int) * (socknum + 1));
socklist[socknum++] = sockfd;
if (maxfd < sockfd)
#else /* NO_IPV6 */
-static int socksetup(int port, int **socklist_p)
+static int socksetup(char *listen_addr, int listen_port, int **socklist_p)
{
struct sockaddr_in sin;
int sockfd;
+ 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;
- memset(&sin, 0, sizeof sin);
- sin.sin_family = AF_INET;
- sin.sin_addr.s_addr = htonl(INADDR_ANY);
- sin.sin_port = htons(port);
-
if (set_reuse_addr(sockfd)) {
close(sockfd);
return 0;
}
}
-static int serve(int port)
+/* if any standard file descriptor is missing open it to /dev/null */
+static void sanitize_stdfds(void)
+{
+ int fd = open("/dev/null", O_RDWR, 0);
+ while (fd != -1 && fd < 2)
+ fd = dup(fd);
+ if (fd == -1)
+ die("open /dev/null or dup failed: %s", strerror(errno));
+ if (fd > 2)
+ close(fd);
+}
+
+static void daemonize(void)
+{
+ switch (fork()) {
+ case 0:
+ break;
+ case -1:
+ die("fork failed: %s", strerror(errno));
+ default:
+ exit(0);
+ }
+ if (setsid() == -1)
+ die("setsid failed: %s", strerror(errno));
+ close(0);
+ close(1);
+ close(2);
+ sanitize_stdfds();
+}
+
+static void store_pid(const char *path)
+{
+ FILE *f = fopen(path, "w");
+ if (!f)
+ die("cannot open pid file %s: %s", path, strerror(errno));
+ fprintf(f, "%d\n", getpid());
+ fclose(f);
+}
+
+static int serve(char *listen_addr, int listen_port, struct passwd *pass, gid_t gid)
{
int socknum, *socklist;
- socknum = socksetup(port, &socklist);
+ socknum = socksetup(listen_addr, listen_port, &socklist);
if (socknum == 0)
- die("unable to allocate any listen sockets on port %u", port);
+ die("unable to allocate any listen sockets on host %s port %u",
+ listen_addr, listen_port);
+
+ if (pass && gid &&
+ (initgroups(pass->pw_name, gid) || setgid (gid) ||
+ setuid(pass->pw_uid)))
+ die("cannot drop privileges");
return service_loop(socknum, socklist);
}
int main(int argc, char **argv)
{
- int port = DEFAULT_GIT_PORT;
+ int listen_port = 0;
+ char *listen_addr = NULL;
int inetd_mode = 0;
+ const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
+ int detach = 0;
+ struct passwd *pass = NULL;
+ struct group *group;
+ gid_t gid = 0;
int i;
+ /* Without this we cannot rely on waitpid() to tell
+ * what happened to our children.
+ */
+ signal(SIGCHLD, SIG_DFL);
+
for (i = 1; i < argc; i++) {
char *arg = argv[i];
+ if (!strncmp(arg, "--listen=", 9)) {
+ char *p = arg + 9;
+ char *ph = listen_addr = xmalloc(strlen(arg + 9) + 1);
+ while (*p)
+ *ph++ = tolower(*p++);
+ *ph = 0;
+ continue;
+ }
if (!strncmp(arg, "--port=", 7)) {
char *end;
unsigned long n;
n = strtoul(arg+7, &end, 0);
if (arg[7] && !*end) {
- port = n;
+ listen_port = n;
continue;
}
}
base_path = arg+12;
continue;
}
+ if (!strncmp(arg, "--interpolated-path=", 20)) {
+ interpolated_path = arg+20;
+ continue;
+ }
if (!strcmp(arg, "--reuseaddr")) {
reuseaddr = 1;
continue;
user_path = arg + 12;
continue;
}
+ if (!strncmp(arg, "--pid-file=", 11)) {
+ pid_file = arg + 11;
+ continue;
+ }
+ if (!strcmp(arg, "--detach")) {
+ detach = 1;
+ log_syslog = 1;
+ continue;
+ }
+ if (!strncmp(arg, "--user=", 7)) {
+ user_name = arg + 7;
+ continue;
+ }
+ if (!strncmp(arg, "--group=", 8)) {
+ group_name = arg + 8;
+ continue;
+ }
+ if (!strncmp(arg, "--enable=", 9)) {
+ enable_service(arg + 9, 1);
+ continue;
+ }
+ if (!strncmp(arg, "--disable=", 10)) {
+ enable_service(arg + 10, 0);
+ continue;
+ }
+ if (!strncmp(arg, "--allow-override=", 17)) {
+ make_service_overridable(arg + 17, 1);
+ continue;
+ }
+ if (!strncmp(arg, "--forbid-override=", 18)) {
+ make_service_overridable(arg + 18, 0);
+ continue;
+ }
if (!strcmp(arg, "--")) {
ok_paths = &argv[i+1];
break;
usage(daemon_usage);
}
- if (log_syslog)
- openlog("git-daemon", 0, LOG_DAEMON);
+ if (inetd_mode && (group_name || user_name))
+ die("--user and --group are incompatible with --inetd");
- if (strict_paths && (!ok_paths || !*ok_paths)) {
- if (!inetd_mode)
- die("git-daemon: option --strict-paths requires a whitelist");
+ if (inetd_mode && (listen_port || listen_addr))
+ die("--listen= and --port= are incompatible with --inetd");
+ else if (listen_port == 0)
+ listen_port = DEFAULT_GIT_PORT;
- logerror("option --strict-paths requires a whitelist");
- exit (1);
+ if (group_name && !user_name)
+ die("--group supplied without --user");
+
+ if (user_name) {
+ pass = getpwnam(user_name);
+ if (!pass)
+ die("user not found - %s", user_name);
+
+ if (!group_name)
+ gid = pass->pw_gid;
+ else {
+ group = getgrnam(group_name);
+ if (!group)
+ die("group not found - %s", group_name);
+
+ gid = group->gr_gid;
+ }
}
+ if (log_syslog) {
+ openlog("git-daemon", 0, LOG_DAEMON);
+ set_die_routine(daemon_die);
+ }
+
+ if (strict_paths && (!ok_paths || !*ok_paths))
+ die("option --strict-paths requires a whitelist");
+
if (inetd_mode) {
- fclose(stderr); //FIXME: workaround
- return execute();
+ struct sockaddr_storage ss;
+ struct sockaddr *peer = (struct sockaddr *)&ss;
+ socklen_t slen = sizeof(ss);
+
+ freopen("/dev/null", "w", stderr);
+
+ if (getpeername(0, peer, &slen))
+ peer = NULL;
+
+ return execute(peer);
}
- return serve(port);
+ if (detach)
+ daemonize();
+ else
+ sanitize_stdfds();
+
+ if (pid_file)
+ store_pid(pid_file);
+
+ return serve(listen_addr, listen_port, pass, gid);
}