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Merge pull request #3546 from matrix-org/rav/fix_erasure_over_federation

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Fix visibility of events from erased users over federation
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Richard van der Hoff 2018-07-17 15:16:45 +01:00 committed by GitHub
commit 0aed3fc346
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3 changed files with 133 additions and 56 deletions
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1
changelog.d/3546.bugfix Normal file
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@ -0,0 +1 @@
Ensure that erasure requests are correctly honoured for publicly accessible rooms when accessed over federation.

125
synapse/visibility.py
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@ -232,7 +232,59 @@ def filter_events_for_client(store, user_id, events, is_peeking=False,
@defer.inlineCallbacks
def filter_events_for_server(store, server_name, events):
# First lets check to see if all the events have a history visibility
# Whatever else we do, we need to check for senders which have requested
# erasure of their data.
erased_senders = yield store.are_users_erased(
e.sender for e in events,
)
def redact_disallowed(event, state):
# if the sender has been gdpr17ed, always return a redacted
# copy of the event.
if erased_senders[event.sender]:
logger.info(
"Sender of %s has been erased, redacting",
event.event_id,
)
return prune_event(event)
# state will be None if we decided we didn't need to filter by
# room membership.
if not state:
return event
history = state.get((EventTypes.RoomHistoryVisibility, ''), None)
if history:
visibility = history.content.get("history_visibility", "shared")
if visibility in ["invited", "joined"]:
# We now loop through all state events looking for
# membership states for the requesting server to determine
# if the server is either in the room or has been invited
# into the room.
for ev in state.itervalues():
if ev.type != EventTypes.Member:
continue
try:
domain = get_domain_from_id(ev.state_key)
except Exception:
continue
if domain != server_name:
continue
memtype = ev.membership
if memtype == Membership.JOIN:
return event
elif memtype == Membership.INVITE:
if visibility == "invited":
return event
else:
# server has no users in the room: redact
return prune_event(event)
return event
# Next lets check to see if all the events have a history visibility
# of "shared" or "world_readable". If thats the case then we don't
# need to check membership (as we know the server is in the room).
event_to_state_ids = yield store.get_state_ids_for_events(
@ -251,15 +303,24 @@ def filter_events_for_server(store, server_name, events):
# If we failed to find any history visibility events then the default
# is "shared" visiblity.
if not visibility_ids:
defer.returnValue(events)
event_map = yield store.get_events(visibility_ids)
all_open = all(
e.content.get("history_visibility") in (None, "shared", "world_readable")
for e in event_map.itervalues()
)
all_open = True
else:
event_map = yield store.get_events(visibility_ids)
all_open = all(
e.content.get("history_visibility") in (None, "shared", "world_readable")
for e in event_map.itervalues()
)
if all_open:
# all the history_visibility state affecting these events is open, so
# we don't need to filter by membership state. We *do* need to check
# for user erasure, though.
if erased_senders:
events = [
redact_disallowed(e, None)
for e in events
]
defer.returnValue(events)
# Ok, so we're dealing with events that have non-trivial visibility
@ -314,54 +375,6 @@ def filter_events_for_server(store, server_name, events):
for e_id, key_to_eid in event_to_state_ids.iteritems()
}
erased_senders = yield store.are_users_erased(
e.sender for e in events,
)
def redact_disallowed(event, state):
# if the sender has been gdpr17ed, always return a redacted
# copy of the event.
if erased_senders[event.sender]:
logger.info(
"Sender of %s has been erased, redacting",
event.event_id,
)
return prune_event(event)
if not state:
return event
history = state.get((EventTypes.RoomHistoryVisibility, ''), None)
if history:
visibility = history.content.get("history_visibility", "shared")
if visibility in ["invited", "joined"]:
# We now loop through all state events looking for
# membership states for the requesting server to determine
# if the server is either in the room or has been invited
# into the room.
for ev in state.itervalues():
if ev.type != EventTypes.Member:
continue
try:
domain = get_domain_from_id(ev.state_key)
except Exception:
continue
if domain != server_name:
continue
memtype = ev.membership
if memtype == Membership.JOIN:
return event
elif memtype == Membership.INVITE:
if visibility == "invited":
return event
else:
# server has no users in the room: redact
return prune_event(event)
return event
defer.returnValue([
redact_disallowed(e, event_to_state[e.event_id])
for e in events

63
tests/test_visibility.py
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@ -73,6 +73,51 @@ class FilterEventsForServerTestCase(tests.unittest.TestCase):
self.assertEqual(events_to_filter[i].event_id, filtered[i].event_id)
self.assertEqual(filtered[i].content["a"], "b")
@tests.unittest.DEBUG
@defer.inlineCallbacks
def test_erased_user(self):
# 4 message events, from erased and unerased users, with a membership
# change in the middle of them.
events_to_filter = []
evt = yield self.inject_message("@unerased:local_hs")
events_to_filter.append(evt)
evt = yield self.inject_message("@erased:local_hs")
events_to_filter.append(evt)
evt = yield self.inject_room_member("@joiner:remote_hs")
events_to_filter.append(evt)
evt = yield self.inject_message("@unerased:local_hs")
events_to_filter.append(evt)
evt = yield self.inject_message("@erased:local_hs")
events_to_filter.append(evt)
# the erasey user gets erased
self.hs.get_datastore().mark_user_erased("@erased:local_hs")
# ... and the filtering happens.
filtered = yield filter_events_for_server(
self.store, "test_server", events_to_filter,
)
for i in range(0, len(events_to_filter)):
self.assertEqual(
events_to_filter[i].event_id, filtered[i].event_id,
"Unexpected event at result position %i" % (i, )
)
for i in (0, 3):
self.assertEqual(
events_to_filter[i].content["body"], filtered[i].content["body"],
"Unexpected event content at result position %i" % (i,)
)
for i in (1, 4):
self.assertNotIn("body", filtered[i].content)
@defer.inlineCallbacks
def inject_visibility(self, user_id, visibility):
content = {"history_visibility": visibility}
@ -109,6 +154,24 @@ class FilterEventsForServerTestCase(tests.unittest.TestCase):
yield self.hs.get_datastore().persist_event(event, context)
defer.returnValue(event)
@defer.inlineCallbacks
def inject_message(self, user_id, content=None):
if content is None:
content = {"body": "testytest"}
builder = self.event_builder_factory.new({
"type": "m.room.message",
"sender": user_id,
"room_id": TEST_ROOM_ID,
"content": content,
})
event, context = yield self.event_creation_handler.create_new_client_event(
builder
)
yield self.hs.get_datastore().persist_event(event, context)
defer.returnValue(event)
@defer.inlineCallbacks
def test_large_room(self):
# see what happens when we have a large room with hundreds of thousands