diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py
index 71ce5b54e5..024d6db27a 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -70,6 +70,7 @@ class RoomMemberHandler(object):
self.clock = hs.get_clock()
self.spam_checker = hs.get_spam_checker()
self._server_notices_mxid = self.config.server_notices_mxid
+ self._enable_lookup = hs.config.enable_3pid_lookup
@abc.abstractmethod
def _remote_join(self, requester, remote_room_hosts, room_id, user, content):
@@ -421,6 +422,9 @@ class RoomMemberHandler(object):
room_id, latest_event_ids=latest_event_ids,
)
+ # TODO: Refactor into dictionary of explicitly allowed transitions
+ # between old and new state, with specific error messages for some
+ # transitions and generic otherwise
old_state_id = current_state_ids.get((EventTypes.Member, target.to_string()))
if old_state_id:
old_state = yield self.store.get_event(old_state_id, allow_none=True)
@@ -446,6 +450,9 @@ class RoomMemberHandler(object):
if same_sender and same_membership and same_content:
defer.returnValue(old_state)
+ if old_membership in ["ban", "leave"] and action == "kick":
+ raise AuthError(403, "The target user is not in the room")
+
# we don't allow people to reject invites to the server notice
# room, but they can leave it once they are joined.
if (
@@ -459,6 +466,9 @@ class RoomMemberHandler(object):
"You cannot reject this invite",
errcode=Codes.CANNOT_LEAVE_SERVER_NOTICE_ROOM,
)
+ else:
+ if action == "kick":
+ raise AuthError(403, "The target user is not in the room")
is_host_in_room = yield self._is_host_in_room(current_state_ids)
@@ -729,6 +739,10 @@ class RoomMemberHandler(object):
Returns:
str: the matrix ID of the 3pid, or None if it is not recognized.
"""
+ if not self._enable_lookup:
+ raise SynapseError(
+ 403, "Looking up third-party identifiers is denied from this server",
+ )
try:
data = yield self.simple_http_client.get_json(
"%s%s/_matrix/identity/api/v1/lookup" % (id_server_scheme, id_server,),
|
