diff --git a/tests/replication/test_auth.py b/tests/replication/test_auth.py
new file mode 100644
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--- /dev/null
+++ b/tests/replication/test_auth.py
@@ -0,0 +1,119 @@
+# -*- coding: utf-8 -*-
+# Copyright 2020 The Matrix.org Foundation C.I.C.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import logging
+from typing import Tuple
+
+from synapse.http.site import SynapseRequest
+from synapse.rest.client.v2_alpha import register
+
+from tests.replication._base import BaseMultiWorkerStreamTestCase
+from tests.server import FakeChannel, make_request
+from tests.unittest import override_config
+
+logger = logging.getLogger(__name__)
+
+
+class WorkerAuthenticationTestCase(BaseMultiWorkerStreamTestCase):
+ """Test the authentication of HTTP calls between workers."""
+
+ servlets = [register.register_servlets]
+
+ def make_homeserver(self, reactor, clock):
+ config = self.default_config()
+ # This isn't a real configuration option but is used to provide the main
+ # homeserver and worker homeserver different options.
+ main_replication_secret = config.pop("main_replication_secret", None)
+ if main_replication_secret:
+ config["worker_replication_secret"] = main_replication_secret
+ return self.setup_test_homeserver(config=config)
+
+ def _get_worker_hs_config(self) -> dict:
+ config = self.default_config()
+ config["worker_app"] = "synapse.app.client_reader"
+ config["worker_replication_host"] = "testserv"
+ config["worker_replication_http_port"] = "8765"
+
+ return config
+
+ def _test_register(self) -> Tuple[SynapseRequest, FakeChannel]:
+ """Run the actual test:
+
+ 1. Create a worker homeserver.
+ 2. Start registration by providing a user/password.
+ 3. Complete registration by providing dummy auth (this hits the main synapse).
+ 4. Return the final request.
+
+ """
+ worker_hs = self.make_worker_hs("synapse.app.client_reader")
+ site = self._hs_to_site[worker_hs]
+
+ request_1, channel_1 = make_request(
+ self.reactor,
+ site,
+ "POST",
+ "register",
+ {"username": "user", "type": "m.login.password", "password": "bar"},
+ ) # type: SynapseRequest, FakeChannel
+ self.assertEqual(request_1.code, 401)
+
+ # Grab the session
+ session = channel_1.json_body["session"]
+
+ # also complete the dummy auth
+ return make_request(
+ self.reactor,
+ site,
+ "POST",
+ "register",
+ {"auth": {"session": session, "type": "m.login.dummy"}},
+ )
+
+ def test_no_auth(self):
+ """With no authentication the request should finish.
+ """
+ request, channel = self._test_register()
+ self.assertEqual(request.code, 200)
+
+ # We're given a registered user.
+ self.assertEqual(channel.json_body["user_id"], "@user:test")
+
+ @override_config({"main_replication_secret": "my-secret"})
+ def test_missing_auth(self):
+ """If the main process expects a secret that is not provided, an error results.
+ """
+ request, channel = self._test_register()
+ self.assertEqual(request.code, 500)
+
+ @override_config(
+ {
+ "main_replication_secret": "my-secret",
+ "worker_replication_secret": "wrong-secret",
+ }
+ )
+ def test_unauthorized(self):
+ """If the main process receives the wrong secret, an error results.
+ """
+ request, channel = self._test_register()
+ self.assertEqual(request.code, 500)
+
+ @override_config({"worker_replication_secret": "my-secret"})
+ def test_authorized(self):
+ """The request should finish when the worker provides the authentication header.
+ """
+ request, channel = self._test_register()
+ self.assertEqual(request.code, 200)
+
+ # We're given a registered user.
+ self.assertEqual(channel.json_body["user_id"], "@user:test")
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