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Ignore redactions of m.room.create events (#5701)
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changelog.d/5701.bugfix
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1
changelog.d/5701.bugfix
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@ -0,0 +1 @@
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Ignore redactions of m.room.create events.
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@ -606,21 +606,6 @@ class Auth(object):
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defer.returnValue(auth_ids)
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def check_redaction(self, room_version, event, auth_events):
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"""Check whether the event sender is allowed to redact the target event.
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Returns:
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True if the the sender is allowed to redact the target event if the
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target event was created by them.
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False if the sender is allowed to redact the target event with no
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further checks.
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Raises:
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AuthError if the event sender is definitely not allowed to redact
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the target event.
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"""
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return event_auth.check_redaction(room_version, event, auth_events)
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@defer.inlineCallbacks
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def check_can_change_room_list(self, room_id, user):
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"""Check if the user is allowed to edit the room's entry in the
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@ -23,6 +23,7 @@ from canonicaljson import encode_canonical_json, json
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from twisted.internet import defer
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from twisted.internet.defer import succeed
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from synapse import event_auth
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from synapse.api.constants import EventTypes, Membership, RelationTypes
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from synapse.api.errors import (
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AuthError,
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@ -784,6 +785,20 @@ class EventCreationHandler(object):
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event.signatures.update(returned_invite.signatures)
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if event.type == EventTypes.Redaction:
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original_event = yield self.store.get_event(
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event.redacts,
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check_redacted=False,
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get_prev_content=False,
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allow_rejected=False,
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allow_none=True,
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check_room_id=event.room_id,
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)
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# we can make some additional checks now if we have the original event.
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if original_event:
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if original_event.type == EventTypes.Create:
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raise AuthError(403, "Redacting create events is not permitted")
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prev_state_ids = yield context.get_prev_state_ids(self.store)
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auth_events_ids = yield self.auth.compute_auth_events(
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event, prev_state_ids, for_verification=True
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@ -791,18 +806,18 @@ class EventCreationHandler(object):
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auth_events = yield self.store.get_events(auth_events_ids)
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auth_events = {(e.type, e.state_key): e for e in auth_events.values()}
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room_version = yield self.store.get_room_version(event.room_id)
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if self.auth.check_redaction(room_version, event, auth_events=auth_events):
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original_event = yield self.store.get_event(
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event.redacts,
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check_redacted=False,
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get_prev_content=False,
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allow_rejected=False,
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allow_none=False,
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)
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if event_auth.check_redaction(room_version, event, auth_events=auth_events):
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# this user doesn't have 'redact' rights, so we need to do some more
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# checks on the original event. Let's start by checking the original
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# event exists.
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if not original_event:
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raise NotFoundError("Could not find event %s" % (event.redacts,))
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if event.user_id != original_event.user_id:
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raise AuthError(403, "You don't have permission to redact events")
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# We've already checked.
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# all the checks are done.
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event.internal_metadata.recheck_redaction = False
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if event.type == EventTypes.Create:
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@ -259,6 +259,14 @@ class EventsWorkerStore(SQLBaseStore):
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continue
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original_event = original_event_entry.event
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if original_event.type == EventTypes.Create:
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# we never serve redactions of Creates to clients.
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logger.info(
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"Withholding redaction %s of create event %s",
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event_id,
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redacted_event_id,
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)
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continue
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if entry.event.internal_metadata.need_to_check_redaction():
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original_domain = get_domain_from_id(original_event.sender)
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@ -617,6 +625,10 @@ class EventsWorkerStore(SQLBaseStore):
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Deferred[EventBase|None]: if the event should be redacted, a pruned
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event object. Otherwise, None.
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"""
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if original_ev.type == "m.room.create":
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# we choose to ignore redactions of m.room.create events.
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return None
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redaction_map = yield self._get_events_from_cache_or_db(redactions)
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for redaction_id in redactions:
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@ -157,3 +157,23 @@ class RedactionsTestCase(HomeserverTestCase):
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self.assertEqual(timeline[-2]["event_id"], msg_id)
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self.assertEqual(timeline[-2]["unsigned"]["redacted_by"], redaction_id)
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self.assertEqual(timeline[-2]["content"], {})
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def test_redact_create_event(self):
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# control case: an existing event
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b = self.helper.send(room_id=self.room_id, tok=self.mod_access_token)
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msg_id = b["event_id"]
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self._redact_event(self.mod_access_token, self.room_id, msg_id)
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# sync the room, to get the id of the create event
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timeline = self._sync_room_timeline(self.other_access_token, self.room_id)
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create_event_id = timeline[0]["event_id"]
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# room moderators cannot send redactions for create events
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self._redact_event(
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self.mod_access_token, self.room_id, create_event_id, expect_code=403
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)
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# and nor can normals
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self._redact_event(
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self.other_access_token, self.room_id, create_event_id, expect_code=403
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)
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