Implement MSC1708 (.well-known lookups for server routing) (#4489)

3 files changed, 339 insertions, 7 deletions

diff --git a/tests/http/__init__.py b/tests/http/__init__.py
index e69de29bb2..ee8010f598 100644
--- a/tests/http/__init__.py
+++ b/tests/http/__init__.py
@@ -0,0 +1,42 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 New Vector Ltd
+#
+# 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 os.path
+
+from OpenSSL import SSL
+
+
+def get_test_cert_file():
+    """get the path to the test cert"""
+
+    # the cert file itself is made with:
+    #
+    # openssl req -x509 -newkey rsa:4096 -keyout server.pem  -out server.pem -days 36500 \
+    #     -nodes -subj '/CN=testserv'
+    return os.path.join(
+        os.path.dirname(__file__),
+        'server.pem',
+    )
+
+
+class ServerTLSContext(object):
+    """A TLS Context which presents our test cert."""
+    def __init__(self):
+        self.filename = get_test_cert_file()
+
+    def getContext(self):
+        ctx = SSL.Context(SSL.TLSv1_METHOD)
+        ctx.use_certificate_file(self.filename)
+        ctx.use_privatekey_file(self.filename)
+        return ctx
diff --git a/tests/http/federation/test_matrix_federation_agent.py b/tests/http/federation/test_matrix_federation_agent.py
index 53b52ace59..bd80dd0cb6 100644
--- a/tests/http/federation/test_matrix_federation_agent.py
+++ b/tests/http/federation/test_matrix_federation_agent.py
@@ -17,18 +17,21 @@ import logging
 from mock import Mock
 
 import treq
+from zope.interface import implementer
 
 from twisted.internet import defer
+from twisted.internet._sslverify import ClientTLSOptions, OpenSSLCertificateOptions
 from twisted.internet.protocol import Factory
 from twisted.protocols.tls import TLSMemoryBIOFactory
-from twisted.test.ssl_helpers import ServerTLSContext
 from twisted.web.http import HTTPChannel
+from twisted.web.iweb import IPolicyForHTTPS
 
 from synapse.crypto.context_factory import ClientTLSOptionsFactory
 from synapse.http.federation.matrix_federation_agent import MatrixFederationAgent
 from synapse.http.federation.srv_resolver import Server
 from synapse.util.logcontext import LoggingContext
 
+from tests.http import ServerTLSContext
 from tests.server import FakeTransport, ThreadedMemoryReactorClock
 from tests.unittest import TestCase
 
@@ -44,6 +47,7 @@ class MatrixFederationAgentTests(TestCase):
         self.agent = MatrixFederationAgent(
             reactor=self.reactor,
             tls_client_options_factory=ClientTLSOptionsFactory(None),
+            _well_known_tls_policy=TrustingTLSPolicyForHTTPS(),
             _srv_resolver=self.mock_resolver,
         )
 
@@ -65,10 +69,14 @@ class MatrixFederationAgentTests(TestCase):
         # Normally this would be done by the TCP socket code in Twisted, but we are
         # stubbing that out here.
         client_protocol = client_factory.buildProtocol(None)
-        client_protocol.makeConnection(FakeTransport(server_tls_protocol, self.reactor))
+        client_protocol.makeConnection(
+            FakeTransport(server_tls_protocol, self.reactor, client_protocol),
+        )
 
         # tell the server tls protocol to send its stuff back to the client, too
-        server_tls_protocol.makeConnection(FakeTransport(client_protocol, self.reactor))
+        server_tls_protocol.makeConnection(
+            FakeTransport(client_protocol, self.reactor, server_tls_protocol),
+        )
 
         # give the reactor a pump to get the TLS juices flowing.
         self.reactor.pump((0.1,))
@@ -101,9 +109,49 @@ class MatrixFederationAgentTests(TestCase):
             try:
                 fetch_res = yield fetch_d
                 defer.returnValue(fetch_res)
+            except Exception as e:
+                logger.info("Fetch of %s failed: %s", uri.decode("ascii"), e)
+                raise
             finally:
                 _check_logcontext(context)
 
+    def _handle_well_known_connection(self, client_factory, expected_sni, target_server):
+        """Handle an outgoing HTTPs connection: wire it up to a server, check that the
+        request is for a .well-known, and send the response.
+
+        Args:
+            client_factory (IProtocolFactory): outgoing connection
+            expected_sni (bytes): SNI that we expect the outgoing connection to send
+            target_server (bytes): target server that we should redirect to in the
+                .well-known response.
+        """
+        # make the connection for .well-known
+        well_known_server = self._make_connection(
+            client_factory,
+            expected_sni=expected_sni,
+        )
+        # check the .well-known request and send a response
+        self.assertEqual(len(well_known_server.requests), 1)
+        request = well_known_server.requests[0]
+        self._send_well_known_response(request, target_server)
+
+    def _send_well_known_response(self, request, target_server):
+        """Check that an incoming request looks like a valid .well-known request, and
+        send back the response.
+        """
+        self.assertEqual(request.method, b'GET')
+        self.assertEqual(request.path, b'/.well-known/matrix/server')
+        self.assertEqual(
+            request.requestHeaders.getRawHeaders(b'host'),
+            [b'testserv'],
+        )
+        # send back a response
+        request.responseHeaders.setRawHeaders(b'Content-Type', [b'application/json'])
+        request.write(b'{ "m.server": "%s" }' % (target_server,))
+        request.finish()
+
+        self.reactor.pump((0.1, ))
+
     def test_get(self):
         """
         happy-path test of a GET request with an explicit port
@@ -283,9 +331,9 @@ class MatrixFederationAgentTests(TestCase):
         self.reactor.pump((0.1,))
         self.successResultOf(test_d)
 
-    def test_get_hostname_no_srv(self):
+    def test_get_no_srv_no_well_known(self):
         """
-        Test the behaviour when the server name has no port, and no SRV record
+        Test the behaviour when the server name has no port, no SRV, and no well-known
         """
 
         self.mock_resolver.resolve_service.side_effect = lambda _: []
@@ -300,11 +348,24 @@ class MatrixFederationAgentTests(TestCase):
             b"_matrix._tcp.testserv",
         )
 
-        # Make sure treq is trying to connect
+        # there should be an attempt to connect on port 443 for the .well-known
         clients = self.reactor.tcpClients
         self.assertEqual(len(clients), 1)
         (host, port, client_factory, _timeout, _bindAddress) = clients[0]
         self.assertEqual(host, '1.2.3.4')
+        self.assertEqual(port, 443)
+
+        # fonx the connection
+        client_factory.clientConnectionFailed(None, Exception("nope"))
+
+        # attemptdelay on the hostnameendpoint is 0.3, so  takes that long before the
+        # .well-known request fails.
+        self.reactor.pump((0.4,))
+
+        # we should fall back to a direct connection
+        self.assertEqual(len(clients), 2)
+        (host, port, client_factory, _timeout, _bindAddress) = clients[1]
+        self.assertEqual(host, '1.2.3.4')
         self.assertEqual(port, 8448)
 
         # make a test server, and wire up the client
@@ -327,6 +388,67 @@ class MatrixFederationAgentTests(TestCase):
         self.reactor.pump((0.1,))
         self.successResultOf(test_d)
 
+    def test_get_well_known(self):
+        """Test the behaviour when the server name has no port and no SRV record, but
+        the .well-known redirects elsewhere
+        """
+
+        self.mock_resolver.resolve_service.side_effect = lambda _: []
+        self.reactor.lookups["testserv"] = "1.2.3.4"
+        self.reactor.lookups["target-server"] = "1::f"
+
+        test_d = self._make_get_request(b"matrix://testserv/foo/bar")
+
+        # Nothing happened yet
+        self.assertNoResult(test_d)
+
+        self.mock_resolver.resolve_service.assert_called_once_with(
+            b"_matrix._tcp.testserv",
+        )
+        self.mock_resolver.resolve_service.reset_mock()
+
+        # there should be an attempt to connect on port 443 for the .well-known
+        clients = self.reactor.tcpClients
+        self.assertEqual(len(clients), 1)
+        (host, port, client_factory, _timeout, _bindAddress) = clients[0]
+        self.assertEqual(host, '1.2.3.4')
+        self.assertEqual(port, 443)
+
+        self._handle_well_known_connection(
+            client_factory, expected_sni=b"testserv", target_server=b"target-server",
+        )
+
+        # there should be another SRV lookup
+        self.mock_resolver.resolve_service.assert_called_once_with(
+            b"_matrix._tcp.target-server",
+        )
+
+        # now we should get a connection to the target server
+        self.assertEqual(len(clients), 2)
+        (host, port, client_factory, _timeout, _bindAddress) = clients[1]
+        self.assertEqual(host, '1::f')
+        self.assertEqual(port, 8448)
+
+        # make a test server, and wire up the client
+        http_server = self._make_connection(
+            client_factory,
+            expected_sni=b'target-server',
+        )
+
+        self.assertEqual(len(http_server.requests), 1)
+        request = http_server.requests[0]
+        self.assertEqual(request.method, b'GET')
+        self.assertEqual(request.path, b'/foo/bar')
+        self.assertEqual(
+            request.requestHeaders.getRawHeaders(b'host'),
+            [b'target-server'],
+        )
+
+        # finish the request
+        request.finish()
+        self.reactor.pump((0.1,))
+        self.successResultOf(test_d)
+
     def test_get_hostname_srv(self):
         """
         Test the behaviour when there is a single SRV record
@@ -372,6 +494,71 @@ class MatrixFederationAgentTests(TestCase):
         self.reactor.pump((0.1,))
         self.successResultOf(test_d)
 
+    def test_get_well_known_srv(self):
+        """Test the behaviour when the server name has no port and no SRV record, but
+        the .well-known redirects to a place where there is a SRV.
+        """
+
+        self.mock_resolver.resolve_service.side_effect = lambda _: []
+        self.reactor.lookups["testserv"] = "1.2.3.4"
+        self.reactor.lookups["srvtarget"] = "5.6.7.8"
+
+        test_d = self._make_get_request(b"matrix://testserv/foo/bar")
+
+        # Nothing happened yet
+        self.assertNoResult(test_d)
+
+        self.mock_resolver.resolve_service.assert_called_once_with(
+            b"_matrix._tcp.testserv",
+        )
+        self.mock_resolver.resolve_service.reset_mock()
+
+        # there should be an attempt to connect on port 443 for the .well-known
+        clients = self.reactor.tcpClients
+        self.assertEqual(len(clients), 1)
+        (host, port, client_factory, _timeout, _bindAddress) = clients[0]
+        self.assertEqual(host, '1.2.3.4')
+        self.assertEqual(port, 443)
+
+        self.mock_resolver.resolve_service.side_effect = lambda _: [
+            Server(host=b"srvtarget", port=8443),
+        ]
+
+        self._handle_well_known_connection(
+            client_factory, expected_sni=b"testserv", target_server=b"target-server",
+        )
+
+        # there should be another SRV lookup
+        self.mock_resolver.resolve_service.assert_called_once_with(
+            b"_matrix._tcp.target-server",
+        )
+
+        # now we should get a connection to the target of the SRV record
+        self.assertEqual(len(clients), 2)
+        (host, port, client_factory, _timeout, _bindAddress) = clients[1]
+        self.assertEqual(host, '5.6.7.8')
+        self.assertEqual(port, 8443)
+
+        # make a test server, and wire up the client
+        http_server = self._make_connection(
+            client_factory,
+            expected_sni=b'target-server',
+        )
+
+        self.assertEqual(len(http_server.requests), 1)
+        request = http_server.requests[0]
+        self.assertEqual(request.method, b'GET')
+        self.assertEqual(request.path, b'/foo/bar')
+        self.assertEqual(
+            request.requestHeaders.getRawHeaders(b'host'),
+            [b'target-server'],
+        )
+
+        # finish the request
+        request.finish()
+        self.reactor.pump((0.1,))
+        self.successResultOf(test_d)
+
     def test_idna_servername(self):
         """test the behaviour when the server name has idna chars in"""
 
@@ -390,11 +577,25 @@ class MatrixFederationAgentTests(TestCase):
             b"_matrix._tcp.xn--bcher-kva.com",
         )
 
-        # Make sure treq is trying to connect
+        # there should be an attempt to connect on port 443 for the .well-known
         clients = self.reactor.tcpClients
         self.assertEqual(len(clients), 1)
         (host, port, client_factory, _timeout, _bindAddress) = clients[0]
         self.assertEqual(host, '1.2.3.4')
+        self.assertEqual(port, 443)
+
+        # fonx the connection
+        client_factory.clientConnectionFailed(None, Exception("nope"))
+
+        # attemptdelay on the hostnameendpoint is 0.3, so  takes that long before the
+        # .well-known request fails.
+        self.reactor.pump((0.4,))
+
+        # We should fall back to port 8448
+        clients = self.reactor.tcpClients
+        self.assertEqual(len(clients), 2)
+        (host, port, client_factory, _timeout, _bindAddress) = clients[1]
+        self.assertEqual(host, '1.2.3.4')
         self.assertEqual(port, 8448)
 
         # make a test server, and wire up the client
@@ -492,3 +693,11 @@ def _build_test_server():
 def _log_request(request):
     """Implements Factory.log, which is expected by Request.finish"""
     logger.info("Completed request %s", request)
+
+
+@implementer(IPolicyForHTTPS)
+class TrustingTLSPolicyForHTTPS(object):
+    """An IPolicyForHTTPS which doesn't do any certificate verification"""
+    def creatorForNetloc(self, hostname, port):
+        certificateOptions = OpenSSLCertificateOptions()
+        return ClientTLSOptions(hostname, certificateOptions.getContext())
diff --git a/tests/http/server.pem b/tests/http/server.pem
new file mode 100644
index 0000000000..0584cf1a80
--- /dev/null
+++ b/tests/http/server.pem
@@ -0,0 +1,81 @@
+-----BEGIN PRIVATE KEY-----
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+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----