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https://mau.dev/maunium/synapse.git
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Fix visibility of events from erased users over federation
This commit is contained in:
Richard van der Hoff
parent
9c04b4abf9
commit
d897be6a98
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@ -232,7 +232,57 @@ def filter_events_for_client(store, user_id, events, is_peeking=False,
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@defer.inlineCallbacks
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def filter_events_for_server(store, server_name, events):
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# First lets check to see if all the events have a history visibility
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# Whatever else we do, we need to check for senders which have requested
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# erasure of their data.
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erased_senders = yield store.are_users_erased(
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e.sender for e in events,
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)
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def redact_disallowed(event, state):
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# if the sender has been gdpr17ed, always return a redacted
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# copy of the event.
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if erased_senders[event.sender]:
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logger.info(
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"Sender of %s has been erased, redacting",
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event.event_id,
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)
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return prune_event(event)
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if not state:
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return event
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history = state.get((EventTypes.RoomHistoryVisibility, ''), None)
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if history:
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visibility = history.content.get("history_visibility", "shared")
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if visibility in ["invited", "joined"]:
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# We now loop through all state events looking for
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# membership states for the requesting server to determine
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# if the server is either in the room or has been invited
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# into the room.
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for ev in state.itervalues():
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if ev.type != EventTypes.Member:
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continue
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try:
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domain = get_domain_from_id(ev.state_key)
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except Exception:
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continue
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if domain != server_name:
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continue
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memtype = ev.membership
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if memtype == Membership.JOIN:
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return event
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elif memtype == Membership.INVITE:
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if visibility == "invited":
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return event
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else:
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# server has no users in the room: redact
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return prune_event(event)
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return event
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# Next lets check to see if all the events have a history visibility
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# of "shared" or "world_readable". If thats the case then we don't
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# need to check membership (as we know the server is in the room).
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event_to_state_ids = yield store.get_state_ids_for_events(
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@ -251,15 +301,24 @@ def filter_events_for_server(store, server_name, events):
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# If we failed to find any history visibility events then the default
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# is "shared" visiblity.
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if not visibility_ids:
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defer.returnValue(events)
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event_map = yield store.get_events(visibility_ids)
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all_open = all(
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e.content.get("history_visibility") in (None, "shared", "world_readable")
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for e in event_map.itervalues()
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)
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all_open = True
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else:
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event_map = yield store.get_events(visibility_ids)
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all_open = all(
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e.content.get("history_visibility") in (None, "shared", "world_readable")
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for e in event_map.itervalues()
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)
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if all_open:
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# all the history_visibility state affecting these events is open, so
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# we don't need to filter by membership state. We *do* need to check
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# for user erasure, though.
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if erased_senders:
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events = [
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redact_disallowed(e, None)
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for e in events
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]
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defer.returnValue(events)
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# Ok, so we're dealing with events that have non-trivial visibility
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@ -314,54 +373,6 @@ def filter_events_for_server(store, server_name, events):
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for e_id, key_to_eid in event_to_state_ids.iteritems()
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}
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erased_senders = yield store.are_users_erased(
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e.sender for e in events,
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)
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def redact_disallowed(event, state):
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# if the sender has been gdpr17ed, always return a redacted
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# copy of the event.
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if erased_senders[event.sender]:
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logger.info(
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"Sender of %s has been erased, redacting",
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event.event_id,
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)
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return prune_event(event)
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if not state:
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return event
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history = state.get((EventTypes.RoomHistoryVisibility, ''), None)
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if history:
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visibility = history.content.get("history_visibility", "shared")
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if visibility in ["invited", "joined"]:
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# We now loop through all state events looking for
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# membership states for the requesting server to determine
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# if the server is either in the room or has been invited
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# into the room.
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for ev in state.itervalues():
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if ev.type != EventTypes.Member:
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continue
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try:
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domain = get_domain_from_id(ev.state_key)
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except Exception:
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continue
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if domain != server_name:
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continue
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memtype = ev.membership
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if memtype == Membership.JOIN:
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return event
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elif memtype == Membership.INVITE:
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if visibility == "invited":
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return event
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else:
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# server has no users in the room: redact
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return prune_event(event)
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return event
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defer.returnValue([
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redact_disallowed(e, event_to_state[e.event_id])
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for e in events
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@ -73,6 +73,51 @@ class FilterEventsForServerTestCase(tests.unittest.TestCase):
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self.assertEqual(events_to_filter[i].event_id, filtered[i].event_id)
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self.assertEqual(filtered[i].content["a"], "b")
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@tests.unittest.DEBUG
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@defer.inlineCallbacks
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def test_erased_user(self):
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# 4 message events, from erased and unerased users, with a membership
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# change in the middle of them.
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events_to_filter = []
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evt = yield self.inject_message("@unerased:local_hs")
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events_to_filter.append(evt)
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evt = yield self.inject_message("@erased:local_hs")
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events_to_filter.append(evt)
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evt = yield self.inject_room_member("@joiner:remote_hs")
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events_to_filter.append(evt)
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evt = yield self.inject_message("@unerased:local_hs")
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events_to_filter.append(evt)
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evt = yield self.inject_message("@erased:local_hs")
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events_to_filter.append(evt)
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# the erasey user gets erased
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self.hs.get_datastore().mark_user_erased("@erased:local_hs")
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# ... and the filtering happens.
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filtered = yield filter_events_for_server(
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self.store, "test_server", events_to_filter,
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)
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for i in range(0, len(events_to_filter)):
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self.assertEqual(
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events_to_filter[i].event_id, filtered[i].event_id,
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"Unexpected event at result position %i" % (i, )
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)
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for i in (0, 3):
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self.assertEqual(
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events_to_filter[i].content["body"], filtered[i].content["body"],
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"Unexpected event content at result position %i" % (i,)
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)
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for i in (1, 4):
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self.assertNotIn("body", filtered[i].content)
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@defer.inlineCallbacks
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def inject_visibility(self, user_id, visibility):
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content = {"history_visibility": visibility}
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@ -109,6 +154,24 @@ class FilterEventsForServerTestCase(tests.unittest.TestCase):
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yield self.hs.get_datastore().persist_event(event, context)
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defer.returnValue(event)
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@defer.inlineCallbacks
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def inject_message(self, user_id, content=None):
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if content is None:
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content = {"body": "testytest"}
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builder = self.event_builder_factory.new({
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"type": "m.room.message",
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"sender": user_id,
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"room_id": TEST_ROOM_ID,
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"content": content,
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})
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event, context = yield self.event_creation_handler.create_new_client_event(
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builder
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)
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yield self.hs.get_datastore().persist_event(event, context)
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defer.returnValue(event)
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@defer.inlineCallbacks
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def test_large_room(self):
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# see what happens when we have a large room with hundreds of thousands
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