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authorMatthew Hodgson <matthew@matrix.org>2020-02-10 09:36:23 +0000
committerGitHub <noreply@github.com>2020-02-10 09:36:23 +0000
commit8e64c5a24c26a733c0cfd3e997ea4079ae457096 (patch)
tree8a154dda1769cb948d1a084b3eb7eef64d9a5131 /synapse/visibility.py
parentUpdate setuptools for python 3.5 tests (#6880) (diff)
downloadsynapse-8e64c5a24c26a733c0cfd3e997ea4079ae457096.tar.xz
filter out m.room.aliases from the CS API until a better solution is specced (#6878)
We're in the middle of properly mitigating spam caused by malicious aliases being added to a room. However, until this work fully lands, we temporarily filter out all m.room.aliases events from /sync and /messages on the CS API, to remove abusive aliases. This is considered acceptable as m.room.aliases events were never a reliable record of the given alias->id mapping and were purely informational, and in their current state do more harm than good.
Diffstat (limited to '')
-rw-r--r--synapse/visibility.py7
1 files changed, 7 insertions, 0 deletions
diff --git a/synapse/visibility.py b/synapse/visibility.py
index 100dc47a8a..d0abd8f04f 100644
--- a/synapse/visibility.py
+++ b/synapse/visibility.py
@@ -122,6 +122,13 @@ def filter_events_for_client(
         if not event.is_state() and event.sender in ignore_list:
             return None
 
+        # Until MSC2261 has landed we can't redact malicious alias events, so for
+        # now we temporarily filter out m.room.aliases entirely to mitigate
+        # abuse, while we spec a better solution to advertising aliases
+        # on rooms.
+        if event.type == EventTypes.Aliases:
+            return None
+
         # Don't try to apply the room's retention policy if the event is a state event, as
         # MSC1763 states that retention is only considered for non-state events.
         if apply_retention_policies and not event.is_state():