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Allow invites via 3pid to bypass sender sig check

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When a server sends a third party invite another server may be the one
that the inviting user registers with. In this case it is that remote
server that will issue an actual invitation, and wants to do it "in the
name of" the original invitee. However, the new proper invite will not
be signed by the original server, and thus other servers would reject
the invite if it was seen as coming from the original user.

To fix this, a special case has been added to the auth rules whereby
another server can send an invite "in the name of" another server's
user, so long as that user had previously issued a third party invite
that is now being accepted.
This commit is contained in:
Erik Johnston 2016-09-22 10:56:53 +01:00
parent bbc0d9617f
commit 1168cbd54d
2 changed files with 22 additions and 7 deletions
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12
synapse/handlers/federation.py
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@ -1922,15 +1922,15 @@ class FederationHandler(BaseHandler):
original_invite = yield self.store.get_event(
original_invite_id, allow_none=True
)
if not original_invite:
if original_invite:
display_name = original_invite.content["display_name"]
event_dict["content"]["third_party_invite"]["display_name"] = display_name
else:
logger.info(
"Could not find invite event for third_party_invite - "
"discarding: %s" % (event_dict,)
"Could not find invite event for third_party_invite: %r",
event_dict
)
return
display_name = original_invite.content["display_name"]
event_dict["content"]["third_party_invite"]["display_name"] = display_name
builder = self.event_builder_factory.new(event_dict)
EventValidator().validate_new(builder)
message_handler = self.hs.get_handlers().message_handler