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authorErik Johnston <erik@matrix.org>2019-07-31 16:03:14 +0100
committerErik Johnston <erik@matrix.org>2019-07-31 16:12:27 +0100
commitcf89266b980b62a6d8547f8e1ae9394359a05fc8 (patch)
treea2711395a6a0076232e7392e98c59665a674f6af
parentChange user deactivated errcode to USER_DEACTIVATED and use it (#5686) (diff)
downloadsynapse-cf89266b980b62a6d8547f8e1ae9394359a05fc8.tar.xz
Deny redaction of events in a different room.
We already correctly filter out such redactions, but we should also deny
them over the CS API.
-rw-r--r--synapse/handlers/message.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index e951c39fa7..a5e23c4caf 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -795,7 +795,6 @@ class EventCreationHandler(object):
                 get_prev_content=False,
                 allow_rejected=False,
                 allow_none=True,
-                check_room_id=event.room_id,
             )
 
             # we can make some additional checks now if we have the original event.
@@ -803,6 +802,9 @@ class EventCreationHandler(object):
                 if original_event.type == EventTypes.Create:
                     raise AuthError(403, "Redacting create events is not permitted")
 
+                if original_event.room_id != event.room_id:
+                    raise SynapseError(400, "Cannot redact event from a different room")
+
             prev_state_ids = yield context.get_prev_state_ids(self.store)
             auth_events_ids = yield self.auth.compute_auth_events(
                 event, prev_state_ids, for_verification=True