static int log_syslog;
static int verbose;
-static const char daemon_usage[] = "git-daemon [--verbose] [--syslog] [--inetd | --port=n]";
+static const char daemon_usage[] =
+"git-daemon [--verbose] [--syslog] [--inetd | --port=n] [--export-all]\n"
+" [--timeout=n] [--init-timeout=n] [directory...]";
+/* List of acceptable pathname prefixes */
+static char **ok_paths = NULL;
+
+/* If this is set, git-daemon-export-ok is not required */
+static int export_all_trees = 0;
+
+/* Timeout, and initial timeout */
+static unsigned int timeout = 0;
+static unsigned int init_timeout = 0;
static void logreport(int priority, const char *err, va_list params)
{
write(2, buf, buflen);
}
-void logerror(const char *err, ...)
+static void logerror(const char *err, ...)
{
va_list params;
va_start(params, err);
va_end(params);
}
-void loginfo(const char *err, ...)
+static void loginfo(const char *err, ...)
{
va_list params;
if (!verbose)
va_end(params);
}
+static int path_ok(const char *dir)
+{
+ const char *p = dir;
+ char **pp;
+ int sl, ndot;
+
+ /* The pathname here should be an absolute path. */
+ if ( *p++ != '/' )
+ return 0;
+
+ sl = 1; ndot = 0;
+
+ for (;;) {
+ if ( *p == '.' ) {
+ ndot++;
+ } else if ( *p == '\0' ) {
+ /* Reject "." and ".." at the end of the path */
+ if ( sl && ndot > 0 && ndot < 3 )
+ return 0;
+
+ /* Otherwise OK */
+ break;
+ } else if ( *p == '/' ) {
+ /* Refuse "", "." or ".." */
+ if ( sl && ndot < 3 )
+ return 0;
+ sl = 1;
+ ndot = 0;
+ } else {
+ sl = ndot = 0;
+ }
+ p++;
+ }
+
+ if ( ok_paths && *ok_paths ) {
+ int ok = 0;
+ int dirlen = strlen(dir);
+
+ for ( pp = ok_paths ; *pp ; pp++ ) {
+ int len = strlen(*pp);
+ if ( len <= dirlen &&
+ !strncmp(*pp, dir, len) &&
+ (dir[len] == '/' || dir[len] == '\0') ) {
+ ok = 1;
+ break;
+ }
+ }
+
+ if ( !ok )
+ return 0; /* Path not in whitelist */
+ }
+
+ return 1; /* Path acceptable */
+}
-static int upload(char *dir, int dirlen)
+static int set_dir(const char *dir)
{
- loginfo("Request for '%s'", dir);
- if (chdir(dir) < 0) {
- logerror("Cannot chdir('%s'): %s", dir, strerror(errno));
+ if (!path_ok(dir)) {
+ errno = EACCES;
return -1;
}
- chdir(".git");
+ if ( chdir(dir) )
+ return -1;
+
/*
* Security on the cheap.
*
- * We want a readable HEAD, usable "objects" directory, and
+ * 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.
*/
- if (access("git-daemon-export-ok", F_OK) ||
- access("objects/00", X_OK) ||
- access("HEAD", R_OK)) {
- logerror("Not a valid gitd-enabled repository: '%s'", dir);
+ if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
+ errno = EACCES;
+ return -1;
+ }
+
+ if (access("objects/", X_OK) || access("HEAD", R_OK)) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ /* If all this passed, we're OK */
+ return 0;
+}
+
+static int upload(char *dir)
+{
+ /* Try paths in this order */
+ static const char *paths[] = { "%s", "%s/.git", "%s.git", "%s.git/.git", NULL };
+ const char **pp;
+ /* Enough for the longest path above including final null */
+ int buflen = strlen(dir)+10;
+ char *dirbuf = xmalloc(buflen);
+ /* Timeout as string */
+ char timeout_buf[64];
+
+ loginfo("Request for '%s'", dir);
+
+ for ( pp = paths ; *pp ; pp++ ) {
+ snprintf(dirbuf, buflen, *pp, dir);
+ if ( !set_dir(dirbuf) )
+ break;
+ }
+
+ if ( !*pp ) {
+ logerror("Cannot set directory '%s': %s", dir, strerror(errno));
return -1;
}
*/
signal(SIGTERM, SIG_IGN);
+ snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
+
/* git-upload-pack only ever reads stuff, so this is safe */
- execlp("git-upload-pack", "git-upload-pack", ".", NULL);
+ execlp("git-upload-pack", "git-upload-pack", "--strict", timeout_buf, ".", NULL);
return -1;
}
static char line[1000];
int len;
+ alarm(init_timeout ? init_timeout : timeout);
len = packet_read_line(0, line, sizeof(line));
+ alarm(0);
if (len && line[len-1] == '\n')
line[--len] = 0;
if (!strncmp("git-upload-pack /", line, 17))
- return upload(line + 16, len - 16);
+ return upload(line+16);
logerror("Protocol error: '%s'", line);
return -1;
for (;;) {
int i;
fds = fds_init;
-
+
if (select(maxfd + 1, &fds, NULL, NULL, NULL) < 0) {
if (errno != EINTR) {
error("select failed, resuming: %s",
continue;
}
}
-
if (!strcmp(arg, "--inetd")) {
inetd_mode = 1;
continue;
openlog("git-daemon", 0, LOG_DAEMON);
continue;
}
+ if (!strcmp(arg, "--export-all")) {
+ export_all_trees = 1;
+ continue;
+ }
+ if (!strncmp(arg, "--timeout=", 10)) {
+ timeout = atoi(arg+10);
+ }
+ if (!strncmp(arg, "--init-timeout=", 15)) {
+ init_timeout = atoi(arg+15);
+ }
+ if (!strcmp(arg, "--")) {
+ ok_paths = &argv[i+1];
+ break;
+ } else if (arg[0] != '-') {
+ ok_paths = &argv[i];
+ break;
+ }
usage(daemon_usage);
}