userdb: Use json_dispatch_user_group_name() to parse GetMembership fields

It allows to relax the checks and allow characters like '\', used by
windows to split the domain name and user name.

For reference, discussion in the systemd-devel mailing list:
https://lists.freedesktop.org/archives/systemd-devel/2023-February/048804.html

Signed-off-by: Samuel Cabrero <scabrero@suse.de>

diff --git a/src/shared/userdb.c b/src/shared/userdb.c
index aa55cc00ae453092db307d294554243b29382ab0..a77eff4407a49c7c12d316328d6d4749788619f3 100644 (file)
--- a/src/shared/userdb.c
+++ b/src/shared/userdb.c
@@ -294,8 +294,8 @@ static int userdb_on_query_reply(
                 } membership_data = {};
 
                 static const JsonDispatch dispatch_table[] = {
-                        { "userName",  JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(struct membership_data, user_name),  JSON_SAFE },
-                        { "groupName", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(struct membership_data, group_name), JSON_SAFE },
+                        { "userName",  JSON_VARIANT_STRING, json_dispatch_user_group_name, offsetof(struct membership_data, user_name),  JSON_RELAX },
+                        { "groupName", JSON_VARIANT_STRING, json_dispatch_user_group_name, offsetof(struct membership_data, group_name), JSON_RELAX },
                         {}
                 };