diff options
| -rw-r--r-- | changelog.d/5801.misc | 1 | ||||
| -rw-r--r-- | synapse/events/validator.py | 9 |
2 files changed, 10 insertions, 0 deletions
diff --git a/changelog.d/5801.misc b/changelog.d/5801.misc new file mode 100644 index 0000000000..e19854de82 --- /dev/null +++ b/changelog.d/5801.misc @@ -0,0 +1 @@ +Don't allow clients to send tombstone events that reference the room it's sent in. diff --git a/synapse/events/validator.py b/synapse/events/validator.py index f7ffd1d561..6374dd067d 100644 --- a/synapse/events/validator.py +++ b/synapse/events/validator.py @@ -106,6 +106,15 @@ class EventValidator(object): if event.content["membership"] not in Membership.LIST: raise SynapseError(400, "Invalid membership key") + elif event.type == EventTypes.Tombstone: + if "replacement_room" not in event.content: + raise SynapseError(400, "Content has no replacement_room key") + + if event.content["replacement_room"] == event.room_id: + raise SynapseError( + 400, "Tombstone cannot reference the room it was sent in" + ) + def _ensure_strings(self, d, keys): for s in keys: if s not in d: |