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Strip "join_authorised_via_users_server" from join events which do not need it. (#10933)

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This fixes a "Event not signed by authorising server" error when
transition room member from join -> join, e.g. when updating a
display name or avatar URL for restricted rooms.
This commit is contained in:
Patrick Cloke 2021-09-30 11:13:59 -04:00 • committed by GitHub
parent 7d84d2523a
commit d1bf5f7c9d
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11 changed files with 46 additions and 25 deletions
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6
synapse/federation/federation_server.py
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@ -34,7 +34,7 @@ from twisted.internet import defer
from twisted.internet.abstract import isIPAddress
from twisted.python import failure
from synapse.api.constants import EduTypes, EventTypes, Membership
from synapse.api.constants import EduTypes, EventContentFields, EventTypes, Membership
from synapse.api.errors import (
AuthError,
Codes,
@ -765,11 +765,11 @@ class FederationServer(FederationBase):
if (
room_version.msc3083_join_rules
and event.membership == Membership.JOIN
and "join_authorised_via_users_server" in event.content
and EventContentFields.AUTHORISING_USER in event.content
):
# We can only authorise our own users.
authorising_server = get_domain_from_id(
event.content["join_authorised_via_users_server"]
event.content[EventContentFields.AUTHORISING_USER]
)
if authorising_server != self.server_name:
raise SynapseError(