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Patch to temporarily drop cross-user m.key_share_requests (#8675)

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Cross-user `m.key_share_requests` are a relatively new `to_device` message that allows user to re-request session keys for a message from another user if they were otherwise unable to retrieve them.

Unfortunately, these have had performance concerns on matrix.org. This is a temporary patch to disable them while we investigate a better solution.
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Andrew Morgan 2020-10-28 11:58:47 +00:00 committed by GitHub
parent bcb6b243e9
commit d60af9305a
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1
changelog.d/8675.misc Normal file
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@ -0,0 +1 @@
Temporarily drop cross-user m.room_key_request to_device messages over performance concerns.

4
synapse/federation/federation_server.py
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@ -915,6 +915,10 @@ class FederationHandlerRegistry:
if not self.config.use_presence and edu_type == "m.presence":
return
# Temporary patch to drop cross-user key share requests
if edu_type == "m.room_key_request":
return
# Check if we have a handler on this instance
handler = self.edu_handlers.get(edu_type)
if handler:

4
synapse/handlers/devicemessage.py
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@ -153,6 +153,10 @@ class DeviceMessageHandler:
local_messages = {}
remote_messages = {} # type: Dict[str, Dict[str, Dict[str, JsonDict]]]
for user_id, by_device in messages.items():
# Temporary patch to disable sending local cross-user key requests.
if message_type == "m.room_key_request" and user_id != sender_user_id:
continue
# we use UserID.from_string to catch invalid user ids
if self.is_mine(UserID.from_string(user_id)):
messages_by_device = {