diff --git a/synapse/config/registration.py b/synapse/config/registration.py
index f6b2b9ceee..fcfda341e9 100644
--- a/synapse/config/registration.py
+++ b/synapse/config/registration.py
@@ -33,6 +33,7 @@ class RegistrationConfig(Config):
self.registrations_require_3pid = config.get("registrations_require_3pid", [])
self.allowed_local_3pids = config.get("allowed_local_3pids", [])
+ self.enable_3pid_lookup = config.get("enable_3pid_lookup", True)
self.registration_shared_secret = config.get("registration_shared_secret")
self.bcrypt_rounds = config.get("bcrypt_rounds", 12)
@@ -97,6 +98,10 @@ class RegistrationConfig(Config):
# - medium: msisdn
# pattern: '\\+44'
+ # Enable 3PIDs lookup requests to identity servers from this server.
+ #
+ #enable_3pid_lookup: true
+
# If set, allows registration of standard or admin accounts by anyone who
# has the shared secret, even if registration is otherwise disabled.
#
diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py
index e432740832..024d6db27a 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -70,6 +70,7 @@ class RoomMemberHandler(object):
self.clock = hs.get_clock()
self.spam_checker = hs.get_spam_checker()
self._server_notices_mxid = self.config.server_notices_mxid
+ self._enable_lookup = hs.config.enable_3pid_lookup
@abc.abstractmethod
def _remote_join(self, requester, remote_room_hosts, room_id, user, content):
@@ -738,6 +739,10 @@ class RoomMemberHandler(object):
Returns:
str: the matrix ID of the 3pid, or None if it is not recognized.
"""
+ if not self._enable_lookup:
+ raise SynapseError(
+ 403, "Looking up third-party identifiers is denied from this server",
+ )
try:
data = yield self.simple_http_client.get_json(
"%s%s/_matrix/identity/api/v1/lookup" % (id_server_scheme, id_server,),
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