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Code Issues Releases Wiki Activity

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

pull/4511/head
Richard van der Hoff 2019-01-29 13:53:02 +00:00 committed by GitHub
parent 2562319821
commit 99e36d5e24
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23 changed files with 470 additions and 21 deletions
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1
MANIFEST.in
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@ -15,6 +15,7 @@ recursive-include docs *
recursive-include scripts *
recursive-include scripts-dev *
recursive-include synapse *.pyi
recursive-include tests *.pem
recursive-include tests *.py
recursive-include synapse/res *

1
changelog.d/4408.feature Normal file
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@ -0,0 +1 @@
Implement MSC1708 (.well-known routing for server-server federation)

1
changelog.d/4408.misc
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@ -1 +0,0 @@
Refactor 'sign_request' as 'build_auth_headers'

1
changelog.d/4409.feature Normal file
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@ -0,0 +1 @@
Implement MSC1708 (.well-known routing for server-server federation)

1
changelog.d/4409.misc
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@ -1 +0,0 @@
Remove redundant federation connection wrapping code

1
changelog.d/4426.feature Normal file
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@ -0,0 +1 @@
Implement MSC1708 (.well-known routing for server-server federation)

1
changelog.d/4426.misc
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@ -1 +0,0 @@
Remove redundant SynapseKeyClientProtocol magic

1
changelog.d/4427.feature Normal file
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@ -0,0 +1 @@
Implement MSC1708 (.well-known routing for server-server federation)

1
changelog.d/4427.misc
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@ -1 +0,0 @@
Refactor and cleanup for SRV record lookup

1
changelog.d/4428.feature Normal file
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@ -0,0 +1 @@
Implement MSC1708 (.well-known routing for server-server federation)

1
changelog.d/4428.misc
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@ -1 +0,0 @@
Move SRV logic into the Agent layer

1
changelog.d/4464.feature Normal file
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@ -0,0 +1 @@
Implement MSC1708 (.well-known routing for server-server federation)

1
changelog.d/4464.misc
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@ -1 +0,0 @@
Move SRV logic into the Agent layer

1
changelog.d/4468.feature Normal file
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@ -0,0 +1 @@
Implement MSC1708 (.well-known routing for server-server federation)

1
changelog.d/4468.misc
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@ -1 +0,0 @@
Move SRV logic into the Agent layer

1
changelog.d/4487.feature Normal file
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@ -0,0 +1 @@
Implement MSC1708 (.well-known routing for server-server federation)

1
changelog.d/4487.misc
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@ -1 +0,0 @@
Fix idna and ipv6 literal handling in MatrixFederationAgent

1
changelog.d/4489.feature Normal file
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@ -0,0 +1 @@
Implement MSC1708 (.well-known routing for server-server federation)

114
synapse/http/federation/matrix_federation_agent.py
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@ -12,6 +12,8 @@
# 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 cgi
import json
import logging
import attr
@ -20,7 +22,7 @@ from zope.interface import implementer
from twisted.internet import defer
from twisted.internet.endpoints import HostnameEndpoint, wrapClientTLS
from twisted.web.client import URI, Agent, HTTPConnectionPool
from twisted.web.client import URI, Agent, HTTPConnectionPool, readBody
from twisted.web.http_headers import Headers
from twisted.web.iweb import IAgent
@ -43,13 +45,19 @@ class MatrixFederationAgent(object):
tls_client_options_factory (ClientTLSOptionsFactory|None):
factory to use for fetching client tls options, or none to disable TLS.
_well_known_tls_policy (IPolicyForHTTPS|None):
TLS policy to use for fetching .well-known files. None to use a default
(browser-like) implementation.
srv_resolver (SrvResolver|None):
SRVResolver impl to use for looking up SRV records. None to use a default
implementation.
"""
def __init__(
self, reactor, tls_client_options_factory, _srv_resolver=None,
self, reactor, tls_client_options_factory,
_well_known_tls_policy=None,
_srv_resolver=None,
):
self._reactor = reactor
self._tls_client_options_factory = tls_client_options_factory
@ -62,6 +70,14 @@ class MatrixFederationAgent(object):
self._pool.maxPersistentPerHost = 5
self._pool.cachedConnectionTimeout = 2 * 60
agent_args = {}
if _well_known_tls_policy is not None:
# the param is called 'contextFactory', but actually passing a
# contextfactory is deprecated, and it expects an IPolicyForHTTPS.
agent_args['contextFactory'] = _well_known_tls_policy
_well_known_agent = Agent(self._reactor, pool=self._pool, **agent_args)
self._well_known_agent = _well_known_agent
@defer.inlineCallbacks
def request(self, method, uri, headers=None, bodyProducer=None):
"""
@ -114,7 +130,11 @@ class MatrixFederationAgent(object):
class EndpointFactory(object):
@staticmethod
def endpointForURI(_uri):
logger.info("Connecting to %s:%s", res.target_host, res.target_port)
logger.info(
"Connecting to %s:%i",
res.target_host.decode("ascii"),
res.target_port,
)
ep = HostnameEndpoint(self._reactor, res.target_host, res.target_port)
if tls_options is not None:
ep = wrapClientTLS(tls_options, ep)
@ -127,7 +147,7 @@ class MatrixFederationAgent(object):
defer.returnValue(res)
@defer.inlineCallbacks
def _route_matrix_uri(self, parsed_uri):
def _route_matrix_uri(self, parsed_uri, lookup_well_known=True):
"""Helper for `request`: determine the routing for a Matrix URI
Args:
@ -135,6 +155,9 @@ class MatrixFederationAgent(object):
parsed with URI.fromBytes(uri, defaultPort=-1) to set the `port` to -1
if there is no explicit port given.
lookup_well_known (bool): True if we should look up the .well-known file if
there is no SRV record.
Returns:
Deferred[_RoutingResult]
"""
@ -169,6 +192,42 @@ class MatrixFederationAgent(object):
service_name = b"_matrix._tcp.%s" % (parsed_uri.host,)
server_list = yield self._srv_resolver.resolve_service(service_name)
if not server_list and lookup_well_known:
# try a .well-known lookup
well_known_server = yield self._get_well_known(parsed_uri.host)
if well_known_server:
# if we found a .well-known, start again, but don't do another
# .well-known lookup.
# parse the server name in the .well-known response into host/port.
# (This code is lifted from twisted.web.client.URI.fromBytes).
if b':' in well_known_server:
well_known_host, well_known_port = well_known_server.rsplit(b':', 1)
try:
well_known_port = int(well_known_port)
except ValueError:
# the part after the colon could not be parsed as an int
# - we assume it is an IPv6 literal with no port (the closing
# ']' stops it being parsed as an int)
well_known_host, well_known_port = well_known_server, -1
else:
well_known_host, well_known_port = well_known_server, -1
new_uri = URI(
scheme=parsed_uri.scheme,
netloc=well_known_server,
host=well_known_host,
port=well_known_port,
path=parsed_uri.path,
params=parsed_uri.params,
query=parsed_uri.query,
fragment=parsed_uri.fragment,
)
res = yield self._route_matrix_uri(new_uri, lookup_well_known=False)
defer.returnValue(res)
if not server_list:
target_host = parsed_uri.host
port = 8448
@ -190,6 +249,53 @@ class MatrixFederationAgent(object):
target_port=port,
))
@defer.inlineCallbacks
def _get_well_known(self, server_name):
"""Attempt to fetch and parse a .well-known file for the given server
Args:
server_name (bytes): name of the server, from the requested url
Returns:
Deferred[bytes|None]: either the new server name, from the .well-known, or
None if there was no .well-known file.
"""
# FIXME: add a cache
uri = b"https://%s/.well-known/matrix/server" % (server_name, )
logger.info("Fetching %s", uri.decode("ascii"))
try:
response = yield make_deferred_yieldable(
self._well_known_agent.request(b"GET", uri),
)
except Exception as e:
logger.info(
"Connection error fetching %s: %s",
uri.decode("ascii"), e,
)
defer.returnValue(None)
body = yield make_deferred_yieldable(readBody(response))
if response.code != 200:
logger.info(
"Error response %i from %s: %s",
response.code, uri.decode("ascii"), body,
)
defer.returnValue(None)
content_types = response.headers.getRawHeaders(u'content-type')
if content_types is None:
raise Exception("no content-type header on .well-known response")
content_type, _opts = cgi.parse_header(content_types[-1])
if content_type != 'application/json':
raise Exception("content-type not application/json on .well-known response")
parsed_body = json.loads(body.decode('utf-8'))
logger.info("Response from .well-known: %s", parsed_body)
if not isinstance(parsed_body, dict) or "m.server" not in parsed_body:
raise Exception("invalid .well-known response")
defer.returnValue(parsed_body["m.server"].encode("ascii"))
@attr.s
class _RoutingResult(object):

42
tests/http/__init__.py
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@ -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

223
tests/http/federation/test_matrix_federation_agent.py
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@ -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())

81
tests/http/server.pem Normal file
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@ -0,0 +1,81 @@
-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----

13
tests/server.py
View File

@ -354,6 +354,11 @@ class FakeTransport(object):
:type: twisted.internet.interfaces.IReactorTime
"""
_protocol = attr.ib(default=None)
"""The Protocol which is producing data for this transport. Optional, but if set
will get called back for connectionLost() notifications etc.
"""
disconnecting = False
buffer = attr.ib(default=b'')
producer = attr.ib(default=None)
@ -364,8 +369,12 @@ class FakeTransport(object):
def getHost(self):
return None
def loseConnection(self):
self.disconnecting = True
def loseConnection(self, reason=None):
logger.info("FakeTransport: loseConnection(%s)", reason)
if not self.disconnecting:
self.disconnecting = True
if self._protocol:
self._protocol.connectionLost(reason)
def abortConnection(self):
self.disconnecting = True