diff options
Diffstat (limited to 'synapse/handlers/room.py')
| -rw-r--r-- | synapse/handlers/room.py | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py index a2973109ad..53569e5212 100644 --- a/synapse/handlers/room.py +++ b/synapse/handlers/room.py @@ -751,6 +751,21 @@ class RoomCreationHandler: if wchar in config["room_alias_name"]: raise SynapseError(400, "Invalid characters in room alias") + if ":" in config["room_alias_name"]: + # Prevent someone from trying to pass in a full alias here. + # Note that it's permissible for a room alias to have multiple + # hash symbols at the start (notably bridged over from IRC, too), + # but the first colon in the alias is defined to separate the local + # part from the server name. + # (remember server names can contain port numbers, also separated + # by a colon. But under no circumstances should the local part be + # allowed to contain a colon!) + raise SynapseError( + 400, + "':' is not permitted in the room alias name. " + "Please note this expects a local part — 'wombat', not '#wombat:example.com'.", + ) + room_alias = RoomAlias(config["room_alias_name"], self.hs.hostname) mapping = await self.store.get_association_from_room_alias(room_alias) |