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authorH. Peter Anvin <hpa@smyrno.hos.anvin.org>2005-09-26 19:10:55 -0700
committerH. Peter Anvin <hpa@smyrno.hos.anvin.org>2005-09-26 19:10:55 -0700
commit4ae95682694a1cd05ee2029fe241ad90d43c8c0e (patch)
tree4188c26501c852ba9c1b1a3f39276d3ac7dc3f8a /daemon.c
parent152da3dfcf2c16d7c240a0dbdcb8a3ae1d332d81 (diff)
downloadgit-4ae95682694a1cd05ee2029fe241ad90d43c8c0e.tar.gz
Support a modicum of path validation, and allow an export all trees option.
Diffstat (limited to 'daemon.c')
-rw-r--r--daemon.c72
1 files changed, 67 insertions, 5 deletions
diff --git a/daemon.c b/daemon.c
index fe46d3e4c6..0ca6cef939 100644
--- a/daemon.c
+++ b/daemon.c
@@ -12,7 +12,13 @@
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] [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;
static void logreport(int priority, const char *err, va_list params)
@@ -69,15 +75,61 @@ void loginfo(const char *err, ...)
va_end(params);
}
+static int path_ok(const char *dir)
+{
+ const char *p = dir;
+ char **pp;
+ int sl = 1, ndot = 0;
+
+ for (;;) {
+ if ( *p == '.' ) {
+ ndot++;
+ } else if ( *p == '/' || *p == '\0' ) {
+ if ( sl && ndot > 0 && ndot < 3 )
+ return 0; /* . or .. in path */
+ sl = 1;
+ if ( *p == '\0' )
+ break; /* End of string and all is good */
+ } else {
+ sl = ndot = 0;
+ }
+ p++;
+ }
+
+ if ( ok_paths && *ok_paths ) {
+ int ok = 0;
+ int dirlen = strlen(dir); /* read_packet_line can return embedded \0 */
+
+ 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)
{
loginfo("Request for '%s'", dir);
+
+ if (!path_ok(dir)) {
+ logerror("Forbidden directory: %s\n", dir);
+ return -1;
+ }
+
if (chdir(dir) < 0) {
logerror("Cannot chdir('%s'): %s", dir, strerror(errno));
return -1;
}
- chdir(".git");
/*
* Security on the cheap.
@@ -86,10 +138,10 @@ static int upload(char *dir, int dirlen)
* 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) ||
+ if ((!export_all_trees && 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);
+ logerror("Not a valid git-daemon-enabled repository: '%s'", dir);
return -1;
}
@@ -441,7 +493,6 @@ int main(int argc, char **argv)
continue;
}
}
-
if (!strcmp(arg, "--inetd")) {
inetd_mode = 1;
continue;
@@ -455,6 +506,17 @@ int main(int argc, char **argv)
openlog("git-daemon", 0, LOG_DAEMON);
continue;
}
+ if (!strcmp(arg, "--export-all")) {
+ export_all_trees = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--")) {
+ ok_paths = &argv[i+1];
+ break;
+ } else if (arg[0] != '-') {
+ ok_paths = &argv[i];
+ break;
+ }
usage(daemon_usage);
}