mirror of
https://git.anonymousland.org/anonymousland/synapse-product.git
synced 2024-12-25 05:09:23 -05:00
319 lines
11 KiB
Python
319 lines
11 KiB
Python
# -*- 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 logging
|
|
import urllib
|
|
|
|
from netaddr import AddrFormatError, IPAddress
|
|
from zope.interface import implementer
|
|
|
|
from twisted.internet import defer
|
|
from twisted.internet.endpoints import HostnameEndpoint, wrapClientTLS
|
|
from twisted.internet.interfaces import IStreamClientEndpoint
|
|
from twisted.web.client import Agent, HTTPConnectionPool
|
|
from twisted.web.http_headers import Headers
|
|
from twisted.web.iweb import IAgent, IAgentEndpointFactory
|
|
|
|
from synapse.http.federation.srv_resolver import Server, SrvResolver
|
|
from synapse.http.federation.well_known_resolver import WellKnownResolver
|
|
from synapse.logging.context import make_deferred_yieldable, run_in_background
|
|
from synapse.util import Clock
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
@implementer(IAgent)
|
|
class MatrixFederationAgent(object):
|
|
"""An Agent-like thing which provides a `request` method which correctly
|
|
handles resolving matrix server names when using matrix://. Handles standard
|
|
https URIs as normal.
|
|
|
|
Doesn't implement any retries. (Those are done in MatrixFederationHttpClient.)
|
|
|
|
Args:
|
|
reactor (IReactor): twisted reactor to use for underlying requests
|
|
|
|
tls_client_options_factory (ClientTLSOptionsFactory|None):
|
|
factory to use for fetching client tls options, or none to disable TLS.
|
|
|
|
_srv_resolver (SrvResolver|None):
|
|
SRVResolver impl to use for looking up SRV records. None to use a default
|
|
implementation.
|
|
|
|
_well_known_resolver (WellKnownResolver|None):
|
|
WellKnownResolver to use to perform well-known lookups. None to use a
|
|
default implementation.
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
reactor,
|
|
tls_client_options_factory,
|
|
_srv_resolver=None,
|
|
_well_known_resolver=None,
|
|
):
|
|
self._reactor = reactor
|
|
self._clock = Clock(reactor)
|
|
self._pool = HTTPConnectionPool(reactor)
|
|
self._pool.retryAutomatically = False
|
|
self._pool.maxPersistentPerHost = 5
|
|
self._pool.cachedConnectionTimeout = 2 * 60
|
|
|
|
self._agent = Agent.usingEndpointFactory(
|
|
self._reactor,
|
|
MatrixHostnameEndpointFactory(
|
|
reactor, tls_client_options_factory, _srv_resolver
|
|
),
|
|
pool=self._pool,
|
|
)
|
|
|
|
if _well_known_resolver is None:
|
|
_well_known_resolver = WellKnownResolver(
|
|
self._reactor,
|
|
agent=Agent(
|
|
self._reactor,
|
|
pool=self._pool,
|
|
contextFactory=tls_client_options_factory,
|
|
),
|
|
)
|
|
|
|
self._well_known_resolver = _well_known_resolver
|
|
|
|
@defer.inlineCallbacks
|
|
def request(self, method, uri, headers=None, bodyProducer=None):
|
|
"""
|
|
Args:
|
|
method (bytes): HTTP method: GET/POST/etc
|
|
uri (bytes): Absolute URI to be retrieved
|
|
headers (twisted.web.http_headers.Headers|None):
|
|
HTTP headers to send with the request, or None to
|
|
send no extra headers.
|
|
bodyProducer (twisted.web.iweb.IBodyProducer|None):
|
|
An object which can generate bytes to make up the
|
|
body of this request (for example, the properly encoded contents of
|
|
a file for a file upload). Or None if the request is to have
|
|
no body.
|
|
Returns:
|
|
Deferred[twisted.web.iweb.IResponse]:
|
|
fires when the header of the response has been received (regardless of the
|
|
response status code). Fails if there is any problem which prevents that
|
|
response from being received (including problems that prevent the request
|
|
from being sent).
|
|
"""
|
|
# We use urlparse as that will set `port` to None if there is no
|
|
# explicit port.
|
|
parsed_uri = urllib.parse.urlparse(uri)
|
|
|
|
# If this is a matrix:// URI check if the server has delegated matrix
|
|
# traffic using well-known delegation.
|
|
#
|
|
# We have to do this here and not in the endpoint as we need to rewrite
|
|
# the host header with the delegated server name.
|
|
delegated_server = None
|
|
if (
|
|
parsed_uri.scheme == b"matrix"
|
|
and not _is_ip_literal(parsed_uri.hostname)
|
|
and not parsed_uri.port
|
|
):
|
|
well_known_result = yield self._well_known_resolver.get_well_known(
|
|
parsed_uri.hostname
|
|
)
|
|
delegated_server = well_known_result.delegated_server
|
|
|
|
if delegated_server:
|
|
# Ok, the server has delegated matrix traffic to somewhere else, so
|
|
# lets rewrite the URL to replace the server with the delegated
|
|
# server name.
|
|
uri = urllib.parse.urlunparse(
|
|
(
|
|
parsed_uri.scheme,
|
|
delegated_server,
|
|
parsed_uri.path,
|
|
parsed_uri.params,
|
|
parsed_uri.query,
|
|
parsed_uri.fragment,
|
|
)
|
|
)
|
|
parsed_uri = urllib.parse.urlparse(uri)
|
|
|
|
# We need to make sure the host header is set to the netloc of the
|
|
# server.
|
|
if headers is None:
|
|
headers = Headers()
|
|
else:
|
|
headers = headers.copy()
|
|
|
|
if not headers.hasHeader(b"host"):
|
|
headers.addRawHeader(b"host", parsed_uri.netloc)
|
|
|
|
res = yield make_deferred_yieldable(
|
|
self._agent.request(method, uri, headers, bodyProducer)
|
|
)
|
|
|
|
return res
|
|
|
|
|
|
@implementer(IAgentEndpointFactory)
|
|
class MatrixHostnameEndpointFactory(object):
|
|
"""Factory for MatrixHostnameEndpoint for parsing to an Agent.
|
|
"""
|
|
|
|
def __init__(self, reactor, tls_client_options_factory, srv_resolver):
|
|
self._reactor = reactor
|
|
self._tls_client_options_factory = tls_client_options_factory
|
|
|
|
if srv_resolver is None:
|
|
srv_resolver = SrvResolver()
|
|
|
|
self._srv_resolver = srv_resolver
|
|
|
|
def endpointForURI(self, parsed_uri):
|
|
return MatrixHostnameEndpoint(
|
|
self._reactor,
|
|
self._tls_client_options_factory,
|
|
self._srv_resolver,
|
|
parsed_uri,
|
|
)
|
|
|
|
|
|
@implementer(IStreamClientEndpoint)
|
|
class MatrixHostnameEndpoint(object):
|
|
"""An endpoint that resolves matrix:// URLs using Matrix server name
|
|
resolution (i.e. via SRV). Does not check for well-known delegation.
|
|
|
|
Args:
|
|
reactor (IReactor)
|
|
tls_client_options_factory (ClientTLSOptionsFactory|None):
|
|
factory to use for fetching client tls options, or none to disable TLS.
|
|
srv_resolver (SrvResolver): The SRV resolver to use
|
|
parsed_uri (twisted.web.client.URI): The parsed URI that we're wanting
|
|
to connect to.
|
|
"""
|
|
|
|
def __init__(self, reactor, tls_client_options_factory, srv_resolver, parsed_uri):
|
|
self._reactor = reactor
|
|
|
|
self._parsed_uri = parsed_uri
|
|
|
|
# set up the TLS connection params
|
|
#
|
|
# XXX disabling TLS is really only supported here for the benefit of the
|
|
# unit tests. We should make the UTs cope with TLS rather than having to make
|
|
# the code support the unit tests.
|
|
|
|
if tls_client_options_factory is None:
|
|
self._tls_options = None
|
|
else:
|
|
self._tls_options = tls_client_options_factory.get_options(
|
|
self._parsed_uri.host
|
|
)
|
|
|
|
self._srv_resolver = srv_resolver
|
|
|
|
def connect(self, protocol_factory):
|
|
"""Implements IStreamClientEndpoint interface
|
|
"""
|
|
|
|
return run_in_background(self._do_connect, protocol_factory)
|
|
|
|
@defer.inlineCallbacks
|
|
def _do_connect(self, protocol_factory):
|
|
first_exception = None
|
|
|
|
server_list = yield self._resolve_server()
|
|
|
|
for server in server_list:
|
|
host = server.host
|
|
port = server.port
|
|
|
|
try:
|
|
logger.info("Connecting to %s:%i", host.decode("ascii"), port)
|
|
endpoint = HostnameEndpoint(self._reactor, host, port)
|
|
if self._tls_options:
|
|
endpoint = wrapClientTLS(self._tls_options, endpoint)
|
|
result = yield make_deferred_yieldable(
|
|
endpoint.connect(protocol_factory)
|
|
)
|
|
|
|
return result
|
|
except Exception as e:
|
|
logger.info(
|
|
"Failed to connect to %s:%i: %s", host.decode("ascii"), port, e
|
|
)
|
|
if not first_exception:
|
|
first_exception = e
|
|
|
|
# We return the first failure because that's probably the most interesting.
|
|
if first_exception:
|
|
raise first_exception
|
|
|
|
# This shouldn't happen as we should always have at least one host/port
|
|
# to try and if that doesn't work then we'll have an exception.
|
|
raise Exception("Failed to resolve server %r" % (self._parsed_uri.netloc,))
|
|
|
|
@defer.inlineCallbacks
|
|
def _resolve_server(self):
|
|
"""Resolves the server name to a list of hosts and ports to attempt to
|
|
connect to.
|
|
|
|
Returns:
|
|
Deferred[list[Server]]
|
|
"""
|
|
|
|
if self._parsed_uri.scheme != b"matrix":
|
|
return [Server(host=self._parsed_uri.host, port=self._parsed_uri.port)]
|
|
|
|
# Note: We don't do well-known lookup as that needs to have happened
|
|
# before now, due to needing to rewrite the Host header of the HTTP
|
|
# request.
|
|
|
|
# We reparse the URI so that defaultPort is -1 rather than 80
|
|
parsed_uri = urllib.parse.urlparse(self._parsed_uri.toBytes())
|
|
|
|
host = parsed_uri.hostname
|
|
port = parsed_uri.port
|
|
|
|
# If there is an explicit port or the host is an IP address we bypass
|
|
# SRV lookups and just use the given host/port.
|
|
if port or _is_ip_literal(host):
|
|
return [Server(host, port or 8448)]
|
|
|
|
server_list = yield self._srv_resolver.resolve_service(b"_matrix._tcp." + host)
|
|
|
|
if server_list:
|
|
return server_list
|
|
|
|
# No SRV records, so we fallback to host and 8448
|
|
return [Server(host, 8448)]
|
|
|
|
|
|
def _is_ip_literal(host):
|
|
"""Test if the given host name is either an IPv4 or IPv6 literal.
|
|
|
|
Args:
|
|
host (bytes)
|
|
|
|
Returns:
|
|
bool
|
|
"""
|
|
|
|
host = host.decode("ascii")
|
|
|
|
try:
|
|
IPAddress(host)
|
|
return True
|
|
except AddrFormatError:
|
|
return False
|