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Prevent kicking users who aren't in the room (#4999)

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Prevent kick events from succeeding if the user is not currently in the room.
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Andrew Morgan 2019-04-04 13:05:51 +01:00 committed by GitHub
parent 9f5d206c4a
commit db265f0642
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2 changed files with 10 additions and 0 deletions
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1
changelog.d/4999.bugfix Normal file
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@ -0,0 +1 @@
Prevent the ability to kick users from a room they aren't in.

9
synapse/handlers/room_member.py
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@ -421,6 +421,9 @@ 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 +449,9 @@ 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 +465,9 @@ 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)