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Support for routing outbound HTTP requests via a proxy (#6239)

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The `http_proxy` and `HTTPS_PROXY` env vars can be set to a `host[:port]` value which should point to a proxy.

The address of the proxy should be excluded from IP blacklists such as the `url_preview_ip_range_blacklist`.

The proxy will then be used for
 * push
 * url previews
 * phone-home stats
 * recaptcha validation
 * CAS auth validation

It will *not* be used for:
 * Application Services
 * Identity servers
 * Outbound federation
 * In worker configurations, connections from workers to masters

Fixes #4198.
This commit is contained in:
Richard van der Hoff 2019-11-01 14:07:44 +00:00 • committed by GitHub
parent fe1f2b4520
commit 1cb84c6486
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16 changed files with 812 additions and 12 deletions
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17
synapse/http/client.py
View file

@ -45,6 +45,7 @@ from synapse.http import (
cancelled_to_request_timed_out_error,
redact_uri,
)
from synapse.http.proxyagent import ProxyAgent
from synapse.logging.context import make_deferred_yieldable
from synapse.logging.opentracing import set_tag, start_active_span, tags
from synapse.util.async_helpers import timeout_deferred
@ -183,7 +184,15 @@ class SimpleHttpClient(object):
using HTTP in Matrix
"""
def __init__(self, hs, treq_args={}, ip_whitelist=None, ip_blacklist=None):
def __init__(
self,
hs,
treq_args={},
ip_whitelist=None,
ip_blacklist=None,
http_proxy=None,
https_proxy=None,
):
"""
Args:
hs (synapse.server.HomeServer)
@ -192,6 +201,8 @@ class SimpleHttpClient(object):
we may not request.
ip_whitelist (netaddr.IPSet): The whitelisted IP addresses, that we can
request if it were otherwise caught in a blacklist.
http_proxy (bytes): proxy server to use for http connections. host[:port]
https_proxy (bytes): proxy server to use for https connections. host[:port]
"""
self.hs = hs
@ -236,11 +247,13 @@ class SimpleHttpClient(object):
# The default context factory in Twisted 14.0.0 (which we require) is
# BrowserLikePolicyForHTTPS which will do regular cert validation
# 'like a browser'
self.agent = Agent(
self.agent = ProxyAgent(
self.reactor,
connectTimeout=15,
contextFactory=self.hs.get_http_client_context_factory(),
pool=pool,
http_proxy=http_proxy,
https_proxy=https_proxy,
)
if self._ip_blacklist:

195
synapse/http/connectproxyclient.py Normal file
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@ -0,0 +1,195 @@
# -*- coding: utf-8 -*-
# Copyright 2019 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 zope.interface import implementer
from twisted.internet import defer, protocol
from twisted.internet.error import ConnectError
from twisted.internet.interfaces import IStreamClientEndpoint
from twisted.internet.protocol import connectionDone
from twisted.web import http
logger = logging.getLogger(__name__)
class ProxyConnectError(ConnectError):
pass
@implementer(IStreamClientEndpoint)
class HTTPConnectProxyEndpoint(object):
"""An Endpoint implementation which will send a CONNECT request to an http proxy
Wraps an existing HostnameEndpoint for the proxy.
When we get the connect() request from the connection pool (via the TLS wrapper),
we'll first connect to the proxy endpoint with a ProtocolFactory which will make the
CONNECT request. Once that completes, we invoke the protocolFactory which was passed
in.
Args:
reactor: the Twisted reactor to use for the connection
proxy_endpoint (IStreamClientEndpoint): the endpoint to use to connect to the
proxy
host (bytes): hostname that we want to CONNECT to
port (int): port that we want to connect to
"""
def __init__(self, reactor, proxy_endpoint, host, port):
self._reactor = reactor
self._proxy_endpoint = proxy_endpoint
self._host = host
self._port = port
def __repr__(self):
return "<HTTPConnectProxyEndpoint %s>" % (self._proxy_endpoint,)
def connect(self, protocolFactory):
f = HTTPProxiedClientFactory(self._host, self._port, protocolFactory)
d = self._proxy_endpoint.connect(f)
# once the tcp socket connects successfully, we need to wait for the
# CONNECT to complete.
d.addCallback(lambda conn: f.on_connection)
return d
class HTTPProxiedClientFactory(protocol.ClientFactory):
"""ClientFactory wrapper that triggers an HTTP proxy CONNECT on connect.
Once the CONNECT completes, invokes the original ClientFactory to build the
HTTP Protocol object and run the rest of the connection.
Args:
dst_host (bytes): hostname that we want to CONNECT to
dst_port (int): port that we want to connect to
wrapped_factory (protocol.ClientFactory): The original Factory
"""
def __init__(self, dst_host, dst_port, wrapped_factory):
self.dst_host = dst_host
self.dst_port = dst_port
self.wrapped_factory = wrapped_factory
self.on_connection = defer.Deferred()
def startedConnecting(self, connector):
return self.wrapped_factory.startedConnecting(connector)
def buildProtocol(self, addr):
wrapped_protocol = self.wrapped_factory.buildProtocol(addr)
return HTTPConnectProtocol(
self.dst_host, self.dst_port, wrapped_protocol, self.on_connection
)
def clientConnectionFailed(self, connector, reason):
logger.debug("Connection to proxy failed: %s", reason)
if not self.on_connection.called:
self.on_connection.errback(reason)
return self.wrapped_factory.clientConnectionFailed(connector, reason)
def clientConnectionLost(self, connector, reason):
logger.debug("Connection to proxy lost: %s", reason)
if not self.on_connection.called:
self.on_connection.errback(reason)
return self.wrapped_factory.clientConnectionLost(connector, reason)
class HTTPConnectProtocol(protocol.Protocol):
"""Protocol that wraps an existing Protocol to do a CONNECT handshake at connect
Args:
host (bytes): The original HTTP(s) hostname or IPv4 or IPv6 address literal
to put in the CONNECT request
port (int): The original HTTP(s) port to put in the CONNECT request
wrapped_protocol (interfaces.IProtocol): the original protocol (probably
HTTPChannel or TLSMemoryBIOProtocol, but could be anything really)
connected_deferred (Deferred): a Deferred which will be callbacked with
wrapped_protocol when the CONNECT completes
"""
def __init__(self, host, port, wrapped_protocol, connected_deferred):
self.host = host
self.port = port
self.wrapped_protocol = wrapped_protocol
self.connected_deferred = connected_deferred
self.http_setup_client = HTTPConnectSetupClient(self.host, self.port)
self.http_setup_client.on_connected.addCallback(self.proxyConnected)
def connectionMade(self):
self.http_setup_client.makeConnection(self.transport)
def connectionLost(self, reason=connectionDone):
if self.wrapped_protocol.connected:
self.wrapped_protocol.connectionLost(reason)
self.http_setup_client.connectionLost(reason)
if not self.connected_deferred.called:
self.connected_deferred.errback(reason)
def proxyConnected(self, _):
self.wrapped_protocol.makeConnection(self.transport)
self.connected_deferred.callback(self.wrapped_protocol)
# Get any pending data from the http buf and forward it to the original protocol
buf = self.http_setup_client.clearLineBuffer()
if buf:
self.wrapped_protocol.dataReceived(buf)
def dataReceived(self, data):
# if we've set up the HTTP protocol, we can send the data there
if self.wrapped_protocol.connected:
return self.wrapped_protocol.dataReceived(data)
# otherwise, we must still be setting up the connection: send the data to the
# setup client
return self.http_setup_client.dataReceived(data)
class HTTPConnectSetupClient(http.HTTPClient):
"""HTTPClient protocol to send a CONNECT message for proxies and read the response.
Args:
host (bytes): The hostname to send in the CONNECT message
port (int): The port to send in the CONNECT message
"""
def __init__(self, host, port):
self.host = host
self.port = port
self.on_connected = defer.Deferred()
def connectionMade(self):
logger.debug("Connected to proxy, sending CONNECT")
self.sendCommand(b"CONNECT", b"%s:%d" % (self.host, self.port))
self.endHeaders()
def handleStatus(self, version, status, message):
logger.debug("Got Status: %s %s %s", status, message, version)
if status != b"200":
raise ProxyConnectError("Unexpected status on CONNECT: %s" % status)
def handleEndHeaders(self):
logger.debug("End Headers")
self.on_connected.callback(None)
def handleResponse(self, body):
pass

195
synapse/http/proxyagent.py Normal file
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@ -0,0 +1,195 @@
# -*- coding: utf-8 -*-
# Copyright 2019 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
import re
from zope.interface import implementer
from twisted.internet import defer
from twisted.internet.endpoints import HostnameEndpoint, wrapClientTLS
from twisted.python.failure import Failure
from twisted.web.client import URI, BrowserLikePolicyForHTTPS, _AgentBase
from twisted.web.error import SchemeNotSupported
from twisted.web.iweb import IAgent
from synapse.http.connectproxyclient import HTTPConnectProxyEndpoint
logger = logging.getLogger(__name__)
_VALID_URI = re.compile(br"\A[\x21-\x7e]+\Z")
@implementer(IAgent)
class ProxyAgent(_AgentBase):
"""An Agent implementation which will use an HTTP proxy if one was requested
Args:
reactor: twisted reactor to place outgoing
connections.
contextFactory (IPolicyForHTTPS): A factory for TLS contexts, to control the
verification parameters of OpenSSL. The default is to use a
`BrowserLikePolicyForHTTPS`, so unless you have special
requirements you can leave this as-is.
connectTimeout (float): The amount of time that this Agent will wait
for the peer to accept a connection.
bindAddress (bytes): The local address for client sockets to bind to.
pool (HTTPConnectionPool|None): connection pool to be used. If None, a
non-persistent pool instance will be created.
"""
def __init__(
self,
reactor,
contextFactory=BrowserLikePolicyForHTTPS(),
connectTimeout=None,
bindAddress=None,
pool=None,
http_proxy=None,
https_proxy=None,
):
_AgentBase.__init__(self, reactor, pool)
self._endpoint_kwargs = {}
if connectTimeout is not None:
self._endpoint_kwargs["timeout"] = connectTimeout
if bindAddress is not None:
self._endpoint_kwargs["bindAddress"] = bindAddress
self.http_proxy_endpoint = _http_proxy_endpoint(
http_proxy, reactor, **self._endpoint_kwargs
)
self.https_proxy_endpoint = _http_proxy_endpoint(
https_proxy, reactor, **self._endpoint_kwargs
)
self._policy_for_https = contextFactory
self._reactor = reactor
def request(self, method, uri, headers=None, bodyProducer=None):
"""
Issue a request to the server indicated by the given uri.
Supports `http` and `https` schemes.
An existing connection from the connection pool may be used or a new one may be
created.
See also: twisted.web.iweb.IAgent.request
Args:
method (bytes): The request method to use, such as `GET`, `POST`, etc
uri (bytes): The location of the resource to request.
headers (Headers|None): Extra headers to send with the request
bodyProducer (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[IResponse]: completes when the header of the response has
been received (regardless of the response status code).
"""
uri = uri.strip()
if not _VALID_URI.match(uri):
raise ValueError("Invalid URI {!r}".format(uri))
parsed_uri = URI.fromBytes(uri)
pool_key = (parsed_uri.scheme, parsed_uri.host, parsed_uri.port)
request_path = parsed_uri.originForm
if parsed_uri.scheme == b"http" and self.http_proxy_endpoint:
# Cache *all* connections under the same key, since we are only
# connecting to a single destination, the proxy:
pool_key = ("http-proxy", self.http_proxy_endpoint)
endpoint = self.http_proxy_endpoint
request_path = uri
elif parsed_uri.scheme == b"https" and self.https_proxy_endpoint:
endpoint = HTTPConnectProxyEndpoint(
self._reactor,
self.https_proxy_endpoint,
parsed_uri.host,
parsed_uri.port,
)
else:
# not using a proxy
endpoint = HostnameEndpoint(
self._reactor, parsed_uri.host, parsed_uri.port, **self._endpoint_kwargs
)
logger.debug("Requesting %s via %s", uri, endpoint)
if parsed_uri.scheme == b"https":
tls_connection_creator = self._policy_for_https.creatorForNetloc(
parsed_uri.host, parsed_uri.port
)
endpoint = wrapClientTLS(tls_connection_creator, endpoint)
elif parsed_uri.scheme == b"http":
pass
else:
return defer.fail(
Failure(
SchemeNotSupported("Unsupported scheme: %r" % (parsed_uri.scheme,))
)
)
return self._requestWithEndpoint(
pool_key, endpoint, method, parsed_uri, headers, bodyProducer, request_path
)
def _http_proxy_endpoint(proxy, reactor, **kwargs):
"""Parses an http proxy setting and returns an endpoint for the proxy
Args:
proxy (bytes|None): the proxy setting
reactor: reactor to be used to connect to the proxy
kwargs: other args to be passed to HostnameEndpoint
Returns:
interfaces.IStreamClientEndpoint|None: endpoint to use to connect to the proxy,
or None
"""
if proxy is None:
return None
# currently we only support hostname:port. Some apps also support
# protocol://<host>[:port], which allows a way of requiring a TLS connection to the
# proxy.
host, port = parse_host_port(proxy, default_port=1080)
return HostnameEndpoint(reactor, host, port, **kwargs)
def parse_host_port(hostport, default_port=None):
# could have sworn we had one of these somewhere else...
if b":" in hostport:
host, port = hostport.rsplit(b":", 1)
try:
port = int(port)
return host, port
except ValueError:
# the thing after the : wasn't a valid port; presumably this is an
# IPv6 address.
pass
return hostport, default_port