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-rw-r--r--CHANGES.md11
-rw-r--r--MANIFEST.in4
-rw-r--r--changelog.d/5415.bugfix1
-rw-r--r--synapse/__init__.py2
-rw-r--r--synapse/config/key.py27
-rw-r--r--synapse/crypto/context_factory.py180
-rw-r--r--synapse/crypto/keyring.py7
-rw-r--r--synapse/python_dependencies.py5
-rw-r--r--tests/http/__init__.py124
-rw-r--r--tests/http/ca.crt19
-rw-r--r--tests/http/ca.key27
-rw-r--r--tests/http/federation/test_matrix_federation_agent.py169
-rw-r--r--tests/http/server.key27
-rw-r--r--tests/http/server.pem81
14 files changed, 489 insertions, 195 deletions
diff --git a/CHANGES.md b/CHANGES.md
index 4dea0f6319..523cdb1153 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,14 @@
+Synapse 1.0.0rc2 (2019-06-10)
+=============================
+
+Bugfixes
+--------
+
+- Remove redundant warning about key server response validation. ([\#5392](https://github.com/matrix-org/synapse/issues/5392))
+- Fix bug where old keys stored in the database with a null valid until timestamp caused all verification requests for that key to fail. ([\#5415](https://github.com/matrix-org/synapse/issues/5415))
+- Fix excessive memory using with default `federation_verify_certificates: true` configuration. ([\#5417](https://github.com/matrix-org/synapse/issues/5417))
+
+
 Synapse 1.0.0rc1 (2019-06-07)
 =============================
 
diff --git a/MANIFEST.in b/MANIFEST.in
index ad1523e387..2c59c7bdc2 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -18,8 +18,10 @@ recursive-include docs *
 recursive-include scripts *
 recursive-include scripts-dev *
 recursive-include synapse *.pyi
-recursive-include tests *.pem
 recursive-include tests *.py
+include tests/http/ca.crt
+include tests/http/ca.key
+include tests/http/server.key
 
 recursive-include synapse/res *
 recursive-include synapse/static *.css
diff --git a/changelog.d/5415.bugfix b/changelog.d/5415.bugfix
deleted file mode 100644
index 83629e193d..0000000000
--- a/changelog.d/5415.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix bug where old keys stored in the database with a null valid until timestamp caused all verification requests for that key to fail.
diff --git a/synapse/__init__.py b/synapse/__init__.py
index 77a4cfc3a5..8dc07fe73c 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -27,4 +27,4 @@ try:
 except ImportError:
     pass
 
-__version__ = "1.0.0rc1"
+__version__ = "1.0.0rc2"
diff --git a/synapse/config/key.py b/synapse/config/key.py
index aba7092ccd..424875feae 100644
--- a/synapse/config/key.py
+++ b/synapse/config/key.py
@@ -41,6 +41,15 @@ validation or TLS certificate validation. This is likely to be very insecure. If
 you are *sure* you want to do this, set 'accept_keys_insecurely' on the
 keyserver configuration."""
 
+RELYING_ON_MATRIX_KEY_ERROR = """\
+Your server is configured to accept key server responses without TLS certificate
+validation, and which are only signed by the old (possibly compromised)
+matrix.org signing key 'ed25519:auto'. This likely isn't what you want to do,
+and you should enable 'federation_verify_certificates' in your configuration.
+
+If you are *sure* you want to do this, set 'accept_keys_insecurely' on the
+trusted_key_server configuration."""
+
 
 logger = logging.getLogger(__name__)
 
@@ -340,10 +349,20 @@ def _parse_key_servers(key_servers, federation_verify_certificates):
                 result.verify_keys[key_id] = verify_key
 
         if (
-            not verify_keys
-            and not server.get("accept_keys_insecurely")
-            and not federation_verify_certificates
+            not federation_verify_certificates and
+            not server.get("accept_keys_insecurely")
         ):
-            raise ConfigError(INSECURE_NOTARY_ERROR)
+            _assert_keyserver_has_verify_keys(result)
 
         yield result
+
+
+def _assert_keyserver_has_verify_keys(trusted_key_server):
+    if not trusted_key_server.verify_keys:
+        raise ConfigError(INSECURE_NOTARY_ERROR)
+
+    # also check that they are not blindly checking the old matrix.org key
+    if trusted_key_server.server_name == "matrix.org" and any(
+        key_id == "ed25519:auto" for key_id in trusted_key_server.verify_keys
+    ):
+        raise ConfigError(RELYING_ON_MATRIX_KEY_ERROR)
diff --git a/synapse/crypto/context_factory.py b/synapse/crypto/context_factory.py
index 59ea087e66..2bc5cc3807 100644
--- a/synapse/crypto/context_factory.py
+++ b/synapse/crypto/context_factory.py
@@ -15,10 +15,13 @@
 
 import logging
 
+import idna
+from service_identity import VerificationError
+from service_identity.pyopenssl import verify_hostname, verify_ip_address
 from zope.interface import implementer
 
 from OpenSSL import SSL, crypto
-from twisted.internet._sslverify import ClientTLSOptions, _defaultCurveName
+from twisted.internet._sslverify import _defaultCurveName
 from twisted.internet.abstract import isIPAddress, isIPv6Address
 from twisted.internet.interfaces import IOpenSSLClientConnectionCreator
 from twisted.internet.ssl import CertificateOptions, ContextFactory, platformTrust
@@ -56,79 +59,19 @@ class ServerContextFactory(ContextFactory):
         return self._context
 
 
-def _idnaBytes(text):
-    """
-    Convert some text typed by a human into some ASCII bytes. This is a
-    copy of twisted.internet._idna._idnaBytes. For documentation, see the
-    twisted documentation.
-    """
-    try:
-        import idna
-    except ImportError:
-        return text.encode("idna")
-    else:
-        return idna.encode(text)
-
-
-def _tolerateErrors(wrapped):
-    """
-    Wrap up an info_callback for pyOpenSSL so that if something goes wrong
-    the error is immediately logged and the connection is dropped if possible.
-    This is a copy of twisted.internet._sslverify._tolerateErrors. For
-    documentation, see the twisted documentation.
-    """
-
-    def infoCallback(connection, where, ret):
-        try:
-            return wrapped(connection, where, ret)
-        except:  # noqa: E722, taken from the twisted implementation
-            f = Failure()
-            logger.exception("Error during info_callback")
-            connection.get_app_data().failVerification(f)
-
-    return infoCallback
+class ClientTLSOptionsFactory(object):
+    """Factory for Twisted SSLClientConnectionCreators that are used to make connections
+    to remote servers for federation.
 
+    Uses one of two OpenSSL context objects for all connections, depending on whether
+    we should do SSL certificate verification.
 
-@implementer(IOpenSSLClientConnectionCreator)
-class ClientTLSOptionsNoVerify(object):
-    """
-    Client creator for TLS without certificate identity verification. This is a
-    copy of twisted.internet._sslverify.ClientTLSOptions with the identity
-    verification left out. For documentation, see the twisted documentation.
+    get_options decides whether we should do SSL certificate verification and
+    constructs an SSLClientConnectionCreator factory accordingly.
     """
 
-    def __init__(self, hostname, ctx):
-        self._ctx = ctx
-
-        if isIPAddress(hostname) or isIPv6Address(hostname):
-            self._hostnameBytes = hostname.encode('ascii')
-            self._sendSNI = False
-        else:
-            self._hostnameBytes = _idnaBytes(hostname)
-            self._sendSNI = True
-
-        ctx.set_info_callback(_tolerateErrors(self._identityVerifyingInfoCallback))
-
-    def clientConnectionForTLS(self, tlsProtocol):
-        context = self._ctx
-        connection = SSL.Connection(context, None)
-        connection.set_app_data(tlsProtocol)
-        return connection
-
-    def _identityVerifyingInfoCallback(self, connection, where, ret):
-        # Literal IPv4 and IPv6 addresses are not permitted
-        # as host names according to the RFCs
-        if where & SSL.SSL_CB_HANDSHAKE_START and self._sendSNI:
-            connection.set_tlsext_host_name(self._hostnameBytes)
-
-
-class ClientTLSOptionsFactory(object):
-    """Factory for Twisted ClientTLSOptions that are used to make connections
-    to remote servers for federation."""
-
     def __init__(self, config):
         self._config = config
-        self._options_noverify = CertificateOptions()
 
         # Check if we're using a custom list of a CA certificates
         trust_root = config.federation_ca_trust_root
@@ -136,11 +79,13 @@ class ClientTLSOptionsFactory(object):
             # Use CA root certs provided by OpenSSL
             trust_root = platformTrust()
 
-        self._options_verify = CertificateOptions(trustRoot=trust_root)
+        self._verify_ssl_context = CertificateOptions(trustRoot=trust_root).getContext()
+        self._verify_ssl_context.set_info_callback(self._context_info_cb)
 
-    def get_options(self, host):
-        # Use _makeContext so that we get a fresh OpenSSL CTX each time.
+        self._no_verify_ssl_context = CertificateOptions().getContext()
+        self._no_verify_ssl_context.set_info_callback(self._context_info_cb)
 
+    def get_options(self, host):
         # Check if certificate verification has been enabled
         should_verify = self._config.federation_verify_certificates
 
@@ -151,6 +96,93 @@ class ClientTLSOptionsFactory(object):
                     should_verify = False
                     break
 
-        if should_verify:
-            return ClientTLSOptions(host, self._options_verify._makeContext())
-        return ClientTLSOptionsNoVerify(host, self._options_noverify._makeContext())
+        ssl_context = (
+            self._verify_ssl_context if should_verify else self._no_verify_ssl_context
+        )
+
+        return SSLClientConnectionCreator(host, ssl_context, should_verify)
+
+    @staticmethod
+    def _context_info_cb(ssl_connection, where, ret):
+        """The 'information callback' for our openssl context object."""
+        # we assume that the app_data on the connection object has been set to
+        # a TLSMemoryBIOProtocol object. (This is done by SSLClientConnectionCreator)
+        tls_protocol = ssl_connection.get_app_data()
+        try:
+            # ... we further assume that SSLClientConnectionCreator has set the
+            # '_synapse_tls_verifier' attribute to a ConnectionVerifier object.
+            tls_protocol._synapse_tls_verifier.verify_context_info_cb(
+                ssl_connection, where
+            )
+        except:  # noqa: E722, taken from the twisted implementation
+            logger.exception("Error during info_callback")
+            f = Failure()
+            tls_protocol.failVerification(f)
+
+
+@implementer(IOpenSSLClientConnectionCreator)
+class SSLClientConnectionCreator(object):
+    """Creates openssl connection objects for client connections.
+
+    Replaces twisted.internet.ssl.ClientTLSOptions
+    """
+
+    def __init__(self, hostname, ctx, verify_certs):
+        self._ctx = ctx
+        self._verifier = ConnectionVerifier(hostname, verify_certs)
+
+    def clientConnectionForTLS(self, tls_protocol):
+        context = self._ctx
+        connection = SSL.Connection(context, None)
+
+        # as per twisted.internet.ssl.ClientTLSOptions, we set the application
+        # data to our TLSMemoryBIOProtocol...
+        connection.set_app_data(tls_protocol)
+
+        # ... and we also gut-wrench a '_synapse_tls_verifier' attribute into the
+        # tls_protocol so that the SSL context's info callback has something to
+        # call to do the cert verification.
+        setattr(tls_protocol, "_synapse_tls_verifier", self._verifier)
+        return connection
+
+
+class ConnectionVerifier(object):
+    """Set the SNI, and do cert verification
+
+    This is a thing which is attached to the TLSMemoryBIOProtocol, and is called by
+    the ssl context's info callback.
+    """
+
+    # This code is based on twisted.internet.ssl.ClientTLSOptions.
+
+    def __init__(self, hostname, verify_certs):
+        self._verify_certs = verify_certs
+
+        if isIPAddress(hostname) or isIPv6Address(hostname):
+            self._hostnameBytes = hostname.encode("ascii")
+            self._is_ip_address = True
+        else:
+            # twisted's ClientTLSOptions falls back to the stdlib impl here if
+            # idna is not installed, but points out that lacks support for
+            # IDNA2008 (http://bugs.python.org/issue17305).
+            #
+            # We can rely on having idna.
+            self._hostnameBytes = idna.encode(hostname)
+            self._is_ip_address = False
+
+        self._hostnameASCII = self._hostnameBytes.decode("ascii")
+
+    def verify_context_info_cb(self, ssl_connection, where):
+        if where & SSL.SSL_CB_HANDSHAKE_START and not self._is_ip_address:
+            ssl_connection.set_tlsext_host_name(self._hostnameBytes)
+
+        if where & SSL.SSL_CB_HANDSHAKE_DONE and self._verify_certs:
+            try:
+                if self._is_ip_address:
+                    verify_ip_address(ssl_connection, self._hostnameASCII)
+                else:
+                    verify_hostname(ssl_connection, self._hostnameASCII)
+            except VerificationError:
+                f = Failure()
+                tls_protocol = ssl_connection.get_app_data()
+                tls_protocol.failVerification(f)
diff --git a/synapse/crypto/keyring.py b/synapse/crypto/keyring.py
index 96964b0d50..6f603f1961 100644
--- a/synapse/crypto/keyring.py
+++ b/synapse/crypto/keyring.py
@@ -750,13 +750,6 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher):
                 verify_signed_json(response, perspective_name, perspective_keys[key_id])
                 verified = True
 
-                if perspective_name == "matrix.org" and key_id == "ed25519:auto":
-                    logger.warning(
-                        "Trusting trusted_key_server responses signed by the "
-                        "compromised matrix.org signing key 'ed25519:auto'. "
-                        "This is a placebo."
-                    )
-
         if not verified:
             raise KeyLookupError(
                 "Response not signed with a known key: signed with: %r, known keys: %r"
diff --git a/synapse/python_dependencies.py b/synapse/python_dependencies.py
index c78f2cb15e..6efd81f204 100644
--- a/synapse/python_dependencies.py
+++ b/synapse/python_dependencies.py
@@ -44,7 +44,10 @@ REQUIREMENTS = [
     "canonicaljson>=1.1.3",
     "signedjson>=1.0.0",
     "pynacl>=1.2.1",
-    "service_identity>=16.0.0",
+    "idna>=2",
+
+    # validating SSL certs for IP addresses requires service_identity 18.1.
+    "service_identity>=18.1.0",
 
     # our logcontext handling relies on the ability to cancel inlineCallbacks
     # (https://twistedmatrix.com/trac/ticket/4632) which landed in Twisted 18.7.
diff --git a/tests/http/__init__.py b/tests/http/__init__.py
index 851fc0eb33..2d5dba6464 100644
--- a/tests/http/__init__.py
+++ b/tests/http/__init__.py
@@ -13,28 +13,122 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import os.path
+import subprocess
+
+from zope.interface import implementer
 
 from OpenSSL import SSL
+from OpenSSL.SSL import Connection
+from twisted.internet.interfaces import IOpenSSLServerConnectionCreator
+
+
+def get_test_ca_cert_file():
+    """Get the path to the test CA cert
+
+    The keypair is generated with:
+
+        openssl genrsa -out ca.key 2048
+        openssl req -new -x509 -key ca.key -days 3650 -out ca.crt \
+            -subj '/CN=synapse test CA'
+    """
+    return os.path.join(os.path.dirname(__file__), "ca.crt")
+
+
+def get_test_key_file():
+    """get the path to the test key
+
+    The key file is made with:
+
+        openssl genrsa -out server.key 2048
+    """
+    return os.path.join(os.path.dirname(__file__), "server.key")
+
+
+cert_file_count = 0
+
+CONFIG_TEMPLATE = b"""\
+[default]
+basicConstraints = CA:FALSE
+keyUsage=nonRepudiation, digitalSignature, keyEncipherment
+subjectAltName = %(sanentries)s
+"""
+
+
+def create_test_cert_file(sanlist):
+    """build an x509 certificate file
+
+    Args:
+        sanlist: list[bytes]: a list of subjectAltName values for the cert
+
+    Returns:
+        str: the path to the file
+    """
+    global cert_file_count
+    csr_filename = "server.csr"
+    cnf_filename = "server.%i.cnf" % (cert_file_count,)
+    cert_filename = "server.%i.crt" % (cert_file_count,)
+    cert_file_count += 1
+
+    # first build a CSR
+    subprocess.check_call(
+        [
+            "openssl",
+            "req",
+            "-new",
+            "-key",
+            get_test_key_file(),
+            "-subj",
+            "/",
+            "-out",
+            csr_filename,
+        ]
+    )
 
+    # now a config file describing the right SAN entries
+    sanentries = b",".join(sanlist)
+    with open(cnf_filename, "wb") as f:
+        f.write(CONFIG_TEMPLATE % {b"sanentries": sanentries})
 
-def get_test_cert_file():
-    """get the path to the test cert"""
+    # finally the cert
+    ca_key_filename = os.path.join(os.path.dirname(__file__), "ca.key")
+    ca_cert_filename = get_test_ca_cert_file()
+    subprocess.check_call(
+        [
+            "openssl",
+            "x509",
+            "-req",
+            "-in",
+            csr_filename,
+            "-CA",
+            ca_cert_filename,
+            "-CAkey",
+            ca_key_filename,
+            "-set_serial",
+            "1",
+            "-extfile",
+            cnf_filename,
+            "-out",
+            cert_filename,
+        ]
+    )
 
-    # 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')
+    return cert_filename
 
 
-class ServerTLSContext(object):
-    """A TLS Context which presents our test cert."""
+@implementer(IOpenSSLServerConnectionCreator)
+class TestServerTLSConnectionFactory(object):
+    """An SSL connection creator which returns connections which present a certificate
+    signed by our test CA."""
 
-    def __init__(self):
-        self.filename = get_test_cert_file()
+    def __init__(self, sanlist):
+        """
+        Args:
+            sanlist: list[bytes]: a list of subjectAltName values for the cert
+        """
+        self._cert_file = create_test_cert_file(sanlist)
 
-    def getContext(self):
+    def serverConnectionForTLS(self, tlsProtocol):
         ctx = SSL.Context(SSL.TLSv1_METHOD)
-        ctx.use_certificate_file(self.filename)
-        ctx.use_privatekey_file(self.filename)
-        return ctx
+        ctx.use_certificate_file(self._cert_file)
+        ctx.use_privatekey_file(get_test_key_file())
+        return Connection(ctx, None)
diff --git a/tests/http/ca.crt b/tests/http/ca.crt
new file mode 100644
index 0000000000..730f81e99c
--- /dev/null
+++ b/tests/http/ca.crt
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/tests/http/ca.key b/tests/http/ca.key
new file mode 100644
index 0000000000..5c99cae186
--- /dev/null
+++ b/tests/http/ca.key
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
diff --git a/tests/http/federation/test_matrix_federation_agent.py b/tests/http/federation/test_matrix_federation_agent.py
index 05880a1048..ecce473b01 100644
--- a/tests/http/federation/test_matrix_federation_agent.py
+++ b/tests/http/federation/test_matrix_federation_agent.py
@@ -17,12 +17,14 @@ import logging
 from mock import Mock
 
 import treq
+from service_identity import VerificationError
 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.web._newclient import ResponseNeverReceived
 from twisted.web.http import HTTPChannel
 from twisted.web.http_headers import Headers
 from twisted.web.iweb import IPolicyForHTTPS
@@ -37,13 +39,29 @@ from synapse.http.federation.srv_resolver import Server
 from synapse.util.caches.ttlcache import TTLCache
 from synapse.util.logcontext import LoggingContext
 
-from tests.http import ServerTLSContext
+from tests.http import TestServerTLSConnectionFactory, get_test_ca_cert_file
 from tests.server import FakeTransport, ThreadedMemoryReactorClock
 from tests.unittest import TestCase
 from tests.utils import default_config
 
 logger = logging.getLogger(__name__)
 
+test_server_connection_factory = None
+
+
+def get_connection_factory():
+    # this needs to happen once, but not until we are ready to run the first test
+    global test_server_connection_factory
+    if test_server_connection_factory is None:
+        test_server_connection_factory = TestServerTLSConnectionFactory(sanlist=[
+            b'DNS:testserv',
+            b'DNS:target-server',
+            b'DNS:xn--bcher-kva.com',
+            b'IP:1.2.3.4',
+            b'IP:::1',
+        ])
+    return test_server_connection_factory
+
 
 class MatrixFederationAgentTests(TestCase):
     def setUp(self):
@@ -53,12 +71,11 @@ class MatrixFederationAgentTests(TestCase):
 
         self.well_known_cache = TTLCache("test_cache", timer=self.reactor.seconds)
 
-        # for now, we disable cert verification for the test, since the cert we
-        # present will not be trusted. We should do better here, though.
         config_dict = default_config("test", parse=False)
-        config_dict["federation_verify_certificates"] = False
-        config_dict["trusted_key_servers"] = []
-        config = HomeServerConfig()
+        config_dict["federation_custom_ca_list"] = [get_test_ca_cert_file()]
+        # config_dict["trusted_key_servers"] = []
+
+        self._config = config = HomeServerConfig()
         config.parse_config_dict(config_dict)
 
         self.agent = MatrixFederationAgent(
@@ -77,7 +94,7 @@ class MatrixFederationAgentTests(TestCase):
         """
 
         # build the test server
-        server_tls_protocol = _build_test_server()
+        server_tls_protocol = _build_test_server(get_connection_factory())
 
         # now, tell the client protocol factory to build the client protocol (it will be a
         # _WrappingProtocol, around a TLSMemoryBIOProtocol, around an
@@ -328,6 +345,88 @@ class MatrixFederationAgentTests(TestCase):
         self.reactor.pump((0.1,))
         self.successResultOf(test_d)
 
+    def test_get_hostname_bad_cert(self):
+        """
+        Test the behaviour when the certificate on the server doesn't match the hostname
+        """
+        self.mock_resolver.resolve_service.side_effect = lambda _: []
+        self.reactor.lookups["testserv1"] = "1.2.3.4"
+
+        test_d = self._make_get_request(b"matrix://testserv1/foo/bar")
+
+        # Nothing happened yet
+        self.assertNoResult(test_d)
+
+        # No SRV record lookup yet
+        self.mock_resolver.resolve_service.assert_not_called()
+
+        # 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,))
+
+        # now there should be a SRV lookup
+        self.mock_resolver.resolve_service.assert_called_once_with(
+            b"_matrix._tcp.testserv1"
+        )
+
+        # 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
+        http_server = self._make_connection(client_factory, expected_sni=b'testserv1')
+
+        # there should be no requests
+        self.assertEqual(len(http_server.requests), 0)
+
+        # ... and the request should have failed
+        e = self.failureResultOf(test_d, ResponseNeverReceived)
+        failure_reason = e.value.reasons[0]
+        self.assertIsInstance(failure_reason.value, VerificationError)
+
+    def test_get_ip_address_bad_cert(self):
+        """
+        Test the behaviour when the server name contains an explicit IP, but
+        the server cert doesn't cover it
+        """
+        # there will be a getaddrinfo on the IP
+        self.reactor.lookups["1.2.3.5"] = "1.2.3.5"
+
+        test_d = self._make_get_request(b"matrix://1.2.3.5/foo/bar")
+
+        # Nothing happened yet
+        self.assertNoResult(test_d)
+
+        # Make sure treq is trying to connect
+        clients = self.reactor.tcpClients
+        self.assertEqual(len(clients), 1)
+        (host, port, client_factory, _timeout, _bindAddress) = clients[0]
+        self.assertEqual(host, '1.2.3.5')
+        self.assertEqual(port, 8448)
+
+        # make a test server, and wire up the client
+        http_server = self._make_connection(client_factory, expected_sni=None)
+
+        # there should be no requests
+        self.assertEqual(len(http_server.requests), 0)
+
+        # ... and the request should have failed
+        e = self.failureResultOf(test_d, ResponseNeverReceived)
+        failure_reason = e.value.reasons[0]
+        self.assertIsInstance(failure_reason.value, VerificationError)
+
     def test_get_no_srv_no_well_known(self):
         """
         Test the behaviour when the server name has no port, no SRV, and no well-known
@@ -585,6 +684,49 @@ class MatrixFederationAgentTests(TestCase):
         self.reactor.pump((0.1,))
         self.successResultOf(test_d)
 
+    def test_get_well_known_unsigned_cert(self):
+        """Test the behaviour when the .well-known server presents a cert
+        not signed by a CA
+        """
+
+        # we use the same test server as the other tests, but use an agent
+        # with _well_known_tls_policy left to the default, which will not
+        # trust it (since the presented cert is signed by a test CA)
+
+        self.mock_resolver.resolve_service.side_effect = lambda _: []
+        self.reactor.lookups["testserv"] = "1.2.3.4"
+
+        agent = MatrixFederationAgent(
+            reactor=self.reactor,
+            tls_client_options_factory=ClientTLSOptionsFactory(self._config),
+            _srv_resolver=self.mock_resolver,
+            _well_known_cache=self.well_known_cache,
+        )
+
+        test_d = agent.request(b"GET", b"matrix://testserv/foo/bar")
+
+        # Nothing happened yet
+        self.assertNoResult(test_d)
+
+        # 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)
+
+        http_proto = self._make_connection(
+            client_factory, expected_sni=b"testserv",
+        )
+
+        # there should be no requests
+        self.assertEqual(len(http_proto.requests), 0)
+
+        # and there should be a SRV lookup instead
+        self.mock_resolver.resolve_service.assert_called_once_with(
+            b"_matrix._tcp.testserv"
+        )
+
     def test_get_hostname_srv(self):
         """
         Test the behaviour when there is a single SRV record
@@ -918,11 +1060,17 @@ def _check_logcontext(context):
         raise AssertionError("Expected logcontext %s but was %s" % (context, current))
 
 
-def _build_test_server():
+def _build_test_server(connection_creator):
     """Construct a test server
 
     This builds an HTTP channel, wrapped with a TLSMemoryBIOProtocol
 
+    Args:
+        connection_creator (IOpenSSLServerConnectionCreator): thing to build
+            SSL connections
+        sanlist (list[bytes]): list of the SAN entries for the cert returned
+            by the server
+
     Returns:
         TLSMemoryBIOProtocol
     """
@@ -931,7 +1079,7 @@ def _build_test_server():
     server_factory.log = _log_request
 
     server_tls_factory = TLSMemoryBIOFactory(
-        ServerTLSContext(), isClient=False, wrappedFactory=server_factory
+        connection_creator, isClient=False, wrappedFactory=server_factory
     )
 
     return server_tls_factory.buildProtocol(None)
@@ -944,7 +1092,8 @@ def _log_request(request):
 
 @implementer(IPolicyForHTTPS)
 class TrustingTLSPolicyForHTTPS(object):
-    """An IPolicyForHTTPS which doesn't do any certificate verification"""
+    """An IPolicyForHTTPS which checks that the certificate belongs to the
+    right server, but doesn't check the certificate chain."""
 
     def creatorForNetloc(self, hostname, port):
         certificateOptions = OpenSSLCertificateOptions()
diff --git a/tests/http/server.key b/tests/http/server.key
new file mode 100644
index 0000000000..c53ee02b21
--- /dev/null
+++ b/tests/http/server.key
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----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+hibhAyINnlKlFGkSOI7zdgeuRTf6l9BTIRclvTt4hJpFgzM6hMWEbyE94hJoupsZ
+bm443o/LCWsox2VI05p6urhD6f9znNWKkiyY78izY+elqksvpjgfqEresaTYAeP5
+LQe9KNSK2VuMUP1j4G04M9BxAoGAWe8ITZJuytZOgrz/YIohqPvj1l2tcIYA1a6C
+7xEFSMIIxtpZIWSLZIFJEsCakpHBkPX4iwIveZfmt/JrM1JFTWK6ZZVGyh/BmOIZ
+Bg4lU1oBqJTUo+aZQtTCJS29b2n5OPpkNYkXTdP4e9UsVKNDvfPlYZJneUeEzxDr
+bqCPIRECgYA544KMwrWxDQZg1dsKWgdVVKx80wEFZAiQr9+0KF6ch6Iu7lwGJHFY
+iI6O85paX41qeC/Fo+feIWJVJU2GvG6eBsbO4bmq+KSg4NkABJSYxodgBp9ftNeD
+jo1tfw+gudlNe5jXHu7oSX93tqGjR4Cnlgan/KtfkB96yHOumGmOhQ==
+-----END RSA PRIVATE KEY-----
diff --git a/tests/http/server.pem b/tests/http/server.pem
deleted file mode 100644
index 0584cf1a80..0000000000
--- a/tests/http/server.pem
+++ /dev/null
@@ -1,81 +0,0 @@
------BEGIN PRIVATE KEY-----
-MIIJQgIBADANBgkqhkiG9w0BAQEFAASCCSwwggkoAgEAAoICAQCgF43/3lAgJ+p0
-x7Rn8UcL8a4fctvdkikvZrCngw96LkB34Evfq8YGWlOVjU+f9naUJLAKMatmAfEN
-r+rMX4VOXmpTwuu6iLtqwreUrRFMESyrmvQxa15p+y85gkY0CFmXMblv6ORbxHTG
-ncBGwST4WK4Poewcgt6jcISFCESTUKu1zc3cw1ANIDRyDLB5K44KwIe36dcKckyN
-Kdtv4BJ+3fcIZIkPJH62zqCypgFF1oiFt40uJzClxgHdJZlKYpgkfnDTckw4Y/Mx
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-kG52Eqa/Net6rN3ueiS6yXL5TU3Y6g96bPA2KyNCypucGcddcBfqaiVx/o4AH6yT
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-/0TilzCaJ/9K9pKNhaClVRy7Dt8QjYg6BIWCGSw4ApF7pLnQ9gySn95mersCkVzD
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-KILVFsq3cQC+bEnoM4eVbjEQkGs1RQ==
------END PRIVATE KEY-----
------BEGIN CERTIFICATE-----
-MIIE/jCCAuagAwIBAgIJANFtVaGvJWZlMA0GCSqGSIb3DQEBCwUAMBMxETAPBgNV
-BAMMCHRlc3RzZXJ2MCAXDTE5MDEyNzIyMDIzNloYDzIxMTkwMTAzMjIwMjM2WjAT
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------END CERTIFICATE-----