1 files changed, 36 insertions, 17 deletions

diff --git a/credential-cache--daemon.c b/credential-cache--daemon.c
index cc65a9c0d3..1f14d56e98 100644
--- a/credential-cache--daemon.c
+++ b/credential-cache--daemon.c
@@ -126,8 +126,17 @@ static void serve_one_client(FILE *in, FILE *out)
 			fprintf(out, "password=%s\n", e->item.password);
 		}
 	}
-	else if (!strcmp(action.buf, "exit"))
+	else if (!strcmp(action.buf, "exit")) {
+		/*
+		 * It's important that we clean up our socket first, and then
+		 * signal the client only once we have finished the cleanup.
+		 * Calling exit() directly does this, because we clean up in
+		 * our atexit() handler, and then signal the client when our
+		 * process actually ends, which closes the socket and gives
+		 * them EOF.
+		 */
 		exit(0);
+	}
 	else if (!strcmp(action.buf, "erase"))
 		remove_credential(&c);
 	else if (!strcmp(action.buf, "store")) {
@@ -170,12 +179,12 @@ static int serve_cache_loop(int fd)
 
 		client = accept(fd, NULL, NULL);
 		if (client < 0) {
-			warning("accept failed: %s", strerror(errno));
+			warning_errno("accept failed");
 			return 1;
 		}
 		client2 = dup(client);
 		if (client2 < 0) {
-			warning("dup failed: %s", strerror(errno));
+			warning_errno("dup failed");
 			close(client);
 			return 1;
 		}
@@ -215,7 +224,7 @@ static const char permissions_advice[] =
 "users may be able to read your cached credentials. Consider running:\n"
 "\n"
 "	chmod 0700 %s";
-static void check_socket_directory(const char *path)
+static void init_socket_directory(const char *path)
 {
 	struct stat st;
 	char *path_copy = xstrdup(path);
@@ -224,20 +233,27 @@ static void check_socket_directory(const char *path)
 	if (!stat(dir, &st)) {
 		if (st.st_mode & 077)
 			die(permissions_advice, dir);
-		free(path_copy);
-		return;
+	} else {
+		/*
+		 * We must be sure to create the directory with the correct mode,
+		 * not just chmod it after the fact; otherwise, there is a race
+		 * condition in which somebody can chdir to it, sleep, then try to open
+		 * our protected socket.
+		 */
+		if (safe_create_leading_directories_const(dir) < 0)
+			die_errno("unable to create directories for '%s'", dir);
+		if (mkdir(dir, 0700) < 0)
+			die_errno("unable to mkdir '%s'", dir);
 	}
 
-	/*
-	 * We must be sure to create the directory with the correct mode,
-	 * not just chmod it after the fact; otherwise, there is a race
-	 * condition in which somebody can chdir to it, sleep, then try to open
-	 * our protected socket.
-	 */
-	if (safe_create_leading_directories_const(dir) < 0)
-		die_errno("unable to create directories for '%s'", dir);
-	if (mkdir(dir, 0700) < 0)
-		die_errno("unable to mkdir '%s'", dir);
+	if (chdir(dir))
+		/*
+		 * We don't actually care what our cwd is; we chdir here just to
+		 * be a friendly daemon and avoid tying up our original cwd.
+		 * If this fails, it's OK to just continue without that benefit.
+		 */
+		;
+
 	free(path_copy);
 }
 
@@ -264,7 +280,10 @@ int main(int argc, const char **argv)
 	if (!socket_path)
 		usage_with_options(usage, options);
 
-	check_socket_directory(socket_path);
+	if (!is_absolute_path(socket_path))
+		die("socket directory must be an absolute path");
+
+	init_socket_directory(socket_path);
 	register_tempfile(&socket_file, socket_path);
 
 	if (ignore_sighup)