695 lines
24 KiB
Python
695 lines
24 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2018 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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import urllib
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from io import BytesIO
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import treq
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from canonicaljson import encode_canonical_json
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from netaddr import IPAddress
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from prometheus_client import Counter
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from zope.interface import implementer, provider
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from OpenSSL import SSL
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from OpenSSL.SSL import VERIFY_NONE
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from twisted.internet import defer, protocol, ssl
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from twisted.internet.interfaces import (
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IReactorPluggableNameResolver,
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IResolutionReceiver,
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)
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from twisted.internet.task import Cooperator
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from twisted.python.failure import Failure
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from twisted.web._newclient import ResponseDone
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from twisted.web.client import Agent, HTTPConnectionPool, readBody
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from twisted.web.http import PotentialDataLoss
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from twisted.web.http_headers import Headers
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from synapse.api.errors import Codes, HttpResponseException, SynapseError
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from synapse.http import (
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QuieterFileBodyProducer,
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cancelled_to_request_timed_out_error,
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redact_uri,
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)
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from synapse.http.proxyagent import ProxyAgent
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from synapse.logging.context import make_deferred_yieldable
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from synapse.logging.opentracing import set_tag, start_active_span, tags
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from synapse.util import json_decoder
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from synapse.util.async_helpers import timeout_deferred
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logger = logging.getLogger(__name__)
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outgoing_requests_counter = Counter("synapse_http_client_requests", "", ["method"])
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incoming_responses_counter = Counter(
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"synapse_http_client_responses", "", ["method", "code"]
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)
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def check_against_blacklist(ip_address, ip_whitelist, ip_blacklist):
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"""
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Args:
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ip_address (netaddr.IPAddress)
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ip_whitelist (netaddr.IPSet)
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ip_blacklist (netaddr.IPSet)
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"""
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if ip_address in ip_blacklist:
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if ip_whitelist is None or ip_address not in ip_whitelist:
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return True
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return False
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_EPSILON = 0.00000001
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def _make_scheduler(reactor):
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"""Makes a schedular suitable for a Cooperator using the given reactor.
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(This is effectively just a copy from `twisted.internet.task`)
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"""
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def _scheduler(x):
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return reactor.callLater(_EPSILON, x)
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return _scheduler
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class IPBlacklistingResolver(object):
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"""
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A proxy for reactor.nameResolver which only produces non-blacklisted IP
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addresses, preventing DNS rebinding attacks on URL preview.
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"""
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def __init__(self, reactor, ip_whitelist, ip_blacklist):
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"""
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Args:
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reactor (twisted.internet.reactor)
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ip_whitelist (netaddr.IPSet)
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ip_blacklist (netaddr.IPSet)
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"""
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self._reactor = reactor
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self._ip_whitelist = ip_whitelist
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self._ip_blacklist = ip_blacklist
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def resolveHostName(self, recv, hostname, portNumber=0):
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r = recv()
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addresses = []
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def _callback():
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r.resolutionBegan(None)
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has_bad_ip = False
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for i in addresses:
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ip_address = IPAddress(i.host)
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if check_against_blacklist(
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ip_address, self._ip_whitelist, self._ip_blacklist
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):
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logger.info(
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"Dropped %s from DNS resolution to %s due to blacklist"
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% (ip_address, hostname)
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)
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has_bad_ip = True
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# if we have a blacklisted IP, we'd like to raise an error to block the
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# request, but all we can really do from here is claim that there were no
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# valid results.
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if not has_bad_ip:
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for i in addresses:
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r.addressResolved(i)
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r.resolutionComplete()
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@provider(IResolutionReceiver)
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class EndpointReceiver(object):
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@staticmethod
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def resolutionBegan(resolutionInProgress):
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pass
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@staticmethod
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def addressResolved(address):
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addresses.append(address)
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@staticmethod
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def resolutionComplete():
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_callback()
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self._reactor.nameResolver.resolveHostName(
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EndpointReceiver, hostname, portNumber=portNumber
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)
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return r
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class BlacklistingAgentWrapper(Agent):
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"""
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An Agent wrapper which will prevent access to IP addresses being accessed
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directly (without an IP address lookup).
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"""
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def __init__(self, agent, reactor, ip_whitelist=None, ip_blacklist=None):
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"""
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Args:
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agent (twisted.web.client.Agent): The Agent to wrap.
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reactor (twisted.internet.reactor)
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ip_whitelist (netaddr.IPSet)
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ip_blacklist (netaddr.IPSet)
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"""
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self._agent = agent
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self._ip_whitelist = ip_whitelist
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self._ip_blacklist = ip_blacklist
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def request(self, method, uri, headers=None, bodyProducer=None):
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h = urllib.parse.urlparse(uri.decode("ascii"))
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try:
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ip_address = IPAddress(h.hostname)
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if check_against_blacklist(
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ip_address, self._ip_whitelist, self._ip_blacklist
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):
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logger.info("Blocking access to %s due to blacklist" % (ip_address,))
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e = SynapseError(403, "IP address blocked by IP blacklist entry")
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return defer.fail(Failure(e))
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except Exception:
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# Not an IP
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pass
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return self._agent.request(
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method, uri, headers=headers, bodyProducer=bodyProducer
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)
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class SimpleHttpClient(object):
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"""
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A simple, no-frills HTTP client with methods that wrap up common ways of
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using HTTP in Matrix
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"""
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def __init__(
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self,
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hs,
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treq_args={},
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ip_whitelist=None,
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ip_blacklist=None,
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http_proxy=None,
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https_proxy=None,
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):
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"""
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Args:
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hs (synapse.server.HomeServer)
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treq_args (dict): Extra keyword arguments to be given to treq.request.
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ip_blacklist (netaddr.IPSet): The IP addresses that are blacklisted that
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we may not request.
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ip_whitelist (netaddr.IPSet): The whitelisted IP addresses, that we can
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request if it were otherwise caught in a blacklist.
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http_proxy (bytes): proxy server to use for http connections. host[:port]
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https_proxy (bytes): proxy server to use for https connections. host[:port]
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"""
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self.hs = hs
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self._ip_whitelist = ip_whitelist
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self._ip_blacklist = ip_blacklist
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self._extra_treq_args = treq_args
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self.user_agent = hs.version_string
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self.clock = hs.get_clock()
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if hs.config.user_agent_suffix:
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self.user_agent = "%s %s" % (self.user_agent, hs.config.user_agent_suffix)
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# We use this for our body producers to ensure that they use the correct
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# reactor.
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self._cooperator = Cooperator(scheduler=_make_scheduler(hs.get_reactor()))
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self.user_agent = self.user_agent.encode("ascii")
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if self._ip_blacklist:
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real_reactor = hs.get_reactor()
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# If we have an IP blacklist, we need to use a DNS resolver which
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# filters out blacklisted IP addresses, to prevent DNS rebinding.
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nameResolver = IPBlacklistingResolver(
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real_reactor, self._ip_whitelist, self._ip_blacklist
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)
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@implementer(IReactorPluggableNameResolver)
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class Reactor(object):
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def __getattr__(_self, attr):
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if attr == "nameResolver":
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return nameResolver
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else:
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return getattr(real_reactor, attr)
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self.reactor = Reactor()
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else:
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self.reactor = hs.get_reactor()
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# the pusher makes lots of concurrent SSL connections to sygnal, and
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# tends to do so in batches, so we need to allow the pool to keep
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# lots of idle connections around.
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pool = HTTPConnectionPool(self.reactor)
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# XXX: The justification for using the cache factor here is that larger instances
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# will need both more cache and more connections.
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# Still, this should probably be a separate dial
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pool.maxPersistentPerHost = max((100 * hs.config.caches.global_factor, 5))
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pool.cachedConnectionTimeout = 2 * 60
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self.agent = ProxyAgent(
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self.reactor,
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connectTimeout=15,
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contextFactory=self.hs.get_http_client_context_factory(),
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pool=pool,
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http_proxy=http_proxy,
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https_proxy=https_proxy,
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)
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if self._ip_blacklist:
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# If we have an IP blacklist, we then install the blacklisting Agent
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# which prevents direct access to IP addresses, that are not caught
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# by the DNS resolution.
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self.agent = BlacklistingAgentWrapper(
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self.agent,
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self.reactor,
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ip_whitelist=self._ip_whitelist,
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ip_blacklist=self._ip_blacklist,
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)
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async def request(self, method, uri, data=None, headers=None):
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"""
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Args:
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method (str): HTTP method to use.
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uri (str): URI to query.
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data (bytes): Data to send in the request body, if applicable.
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headers (t.w.http_headers.Headers): Request headers.
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"""
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# A small wrapper around self.agent.request() so we can easily attach
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# counters to it
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outgoing_requests_counter.labels(method).inc()
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# log request but strip `access_token` (AS requests for example include this)
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logger.debug("Sending request %s %s", method, redact_uri(uri))
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with start_active_span(
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"outgoing-client-request",
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tags={
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tags.SPAN_KIND: tags.SPAN_KIND_RPC_CLIENT,
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tags.HTTP_METHOD: method,
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tags.HTTP_URL: uri,
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},
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finish_on_close=True,
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):
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try:
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body_producer = None
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if data is not None:
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body_producer = QuieterFileBodyProducer(
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BytesIO(data), cooperator=self._cooperator,
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)
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request_deferred = treq.request(
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method,
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uri,
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agent=self.agent,
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data=body_producer,
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headers=headers,
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**self._extra_treq_args
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)
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request_deferred = timeout_deferred(
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request_deferred,
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60,
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self.hs.get_reactor(),
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cancelled_to_request_timed_out_error,
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)
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response = await make_deferred_yieldable(request_deferred)
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incoming_responses_counter.labels(method, response.code).inc()
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logger.info(
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"Received response to %s %s: %s",
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method,
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redact_uri(uri),
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response.code,
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)
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return response
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except Exception as e:
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incoming_responses_counter.labels(method, "ERR").inc()
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logger.info(
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"Error sending request to %s %s: %s %s",
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method,
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redact_uri(uri),
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type(e).__name__,
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e.args[0],
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)
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set_tag(tags.ERROR, True)
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set_tag("error_reason", e.args[0])
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raise
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async def post_urlencoded_get_json(self, uri, args={}, headers=None):
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"""
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Args:
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uri (str):
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args (dict[str, str|List[str]]): query params
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headers (dict[str|bytes, List[str|bytes]]|None): If not None, a map from
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header name to a list of values for that header
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Returns:
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object: parsed json
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Raises:
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HttpResponseException: On a non-2xx HTTP response.
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ValueError: if the response was not JSON
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"""
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# TODO: Do we ever want to log message contents?
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logger.debug("post_urlencoded_get_json args: %s", args)
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query_bytes = urllib.parse.urlencode(encode_urlencode_args(args), True).encode(
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"utf8"
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)
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actual_headers = {
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b"Content-Type": [b"application/x-www-form-urlencoded"],
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b"User-Agent": [self.user_agent],
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b"Accept": [b"application/json"],
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}
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if headers:
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actual_headers.update(headers)
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response = await self.request(
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"POST", uri, headers=Headers(actual_headers), data=query_bytes
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)
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body = await make_deferred_yieldable(readBody(response))
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if 200 <= response.code < 300:
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return json_decoder.decode(body.decode("utf-8"))
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else:
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raise HttpResponseException(
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response.code, response.phrase.decode("ascii", errors="replace"), body
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)
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async def post_json_get_json(self, uri, post_json, headers=None):
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"""
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Args:
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uri (str):
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post_json (object):
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headers (dict[str|bytes, List[str|bytes]]|None): If not None, a map from
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header name to a list of values for that header
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Returns:
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object: parsed json
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Raises:
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HttpResponseException: On a non-2xx HTTP response.
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ValueError: if the response was not JSON
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"""
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json_str = encode_canonical_json(post_json)
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logger.debug("HTTP POST %s -> %s", json_str, uri)
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actual_headers = {
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b"Content-Type": [b"application/json"],
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b"User-Agent": [self.user_agent],
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b"Accept": [b"application/json"],
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}
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if headers:
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actual_headers.update(headers)
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response = await self.request(
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"POST", uri, headers=Headers(actual_headers), data=json_str
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)
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body = await make_deferred_yieldable(readBody(response))
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if 200 <= response.code < 300:
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return json_decoder.decode(body.decode("utf-8"))
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else:
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raise HttpResponseException(
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response.code, response.phrase.decode("ascii", errors="replace"), body
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)
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async def get_json(self, uri, args={}, headers=None):
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""" Gets some json from the given URI.
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Args:
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uri (str): The URI to request, not including query parameters
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args (dict): A dictionary used to create query strings, defaults to
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None.
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**Note**: The value of each key is assumed to be an iterable
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and *not* a string.
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headers (dict[str|bytes, List[str|bytes]]|None): If not None, a map from
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header name to a list of values for that header
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Returns:
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Succeeds when we get *any* 2xx HTTP response, with the
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HTTP body as JSON.
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Raises:
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HttpResponseException On a non-2xx HTTP response.
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ValueError: if the response was not JSON
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"""
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actual_headers = {b"Accept": [b"application/json"]}
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if headers:
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actual_headers.update(headers)
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body = await self.get_raw(uri, args, headers=headers)
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return json_decoder.decode(body.decode("utf-8"))
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async def put_json(self, uri, json_body, args={}, headers=None):
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""" Puts some json to the given URI.
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Args:
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uri (str): The URI to request, not including query parameters
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json_body (dict): The JSON to put in the HTTP body,
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args (dict): A dictionary used to create query strings, defaults to
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None.
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**Note**: The value of each key is assumed to be an iterable
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and *not* a string.
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headers (dict[str|bytes, List[str|bytes]]|None): If not None, a map from
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header name to a list of values for that header
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Returns:
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Succeeds when we get *any* 2xx HTTP response, with the
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HTTP body as JSON.
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Raises:
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HttpResponseException On a non-2xx HTTP response.
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ValueError: if the response was not JSON
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"""
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if len(args):
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query_bytes = urllib.parse.urlencode(args, True)
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uri = "%s?%s" % (uri, query_bytes)
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json_str = encode_canonical_json(json_body)
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actual_headers = {
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b"Content-Type": [b"application/json"],
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b"User-Agent": [self.user_agent],
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b"Accept": [b"application/json"],
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}
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if headers:
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actual_headers.update(headers)
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response = await self.request(
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"PUT", uri, headers=Headers(actual_headers), data=json_str
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)
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body = await make_deferred_yieldable(readBody(response))
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if 200 <= response.code < 300:
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return json_decoder.decode(body.decode("utf-8"))
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else:
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raise HttpResponseException(
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response.code, response.phrase.decode("ascii", errors="replace"), body
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)
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async def get_raw(self, uri, args={}, headers=None):
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""" Gets raw text from the given URI.
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Args:
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uri (str): The URI to request, not including query parameters
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args (dict): A dictionary used to create query strings, defaults to
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None.
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**Note**: The value of each key is assumed to be an iterable
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and *not* a string.
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headers (dict[str|bytes, List[str|bytes]]|None): If not None, a map from
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header name to a list of values for that header
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Returns:
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Succeeds when we get *any* 2xx HTTP response, with the
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HTTP body as bytes.
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Raises:
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HttpResponseException on a non-2xx HTTP response.
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"""
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if len(args):
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query_bytes = urllib.parse.urlencode(args, True)
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uri = "%s?%s" % (uri, query_bytes)
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actual_headers = {b"User-Agent": [self.user_agent]}
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if headers:
|
|
actual_headers.update(headers)
|
|
|
|
response = await self.request("GET", uri, headers=Headers(actual_headers))
|
|
|
|
body = await make_deferred_yieldable(readBody(response))
|
|
|
|
if 200 <= response.code < 300:
|
|
return body
|
|
else:
|
|
raise HttpResponseException(
|
|
response.code, response.phrase.decode("ascii", errors="replace"), body
|
|
)
|
|
|
|
# XXX: FIXME: This is horribly copy-pasted from matrixfederationclient.
|
|
# The two should be factored out.
|
|
|
|
async def get_file(self, url, output_stream, max_size=None, headers=None):
|
|
"""GETs a file from a given URL
|
|
Args:
|
|
url (str): The URL to GET
|
|
output_stream (file): File to write the response body to.
|
|
headers (dict[str|bytes, List[str|bytes]]|None): If not None, a map from
|
|
header name to a list of values for that header
|
|
Returns:
|
|
A (int,dict,string,int) tuple of the file length, dict of the response
|
|
headers, absolute URI of the response and HTTP response code.
|
|
"""
|
|
|
|
actual_headers = {b"User-Agent": [self.user_agent]}
|
|
if headers:
|
|
actual_headers.update(headers)
|
|
|
|
response = await self.request("GET", url, headers=Headers(actual_headers))
|
|
|
|
resp_headers = dict(response.headers.getAllRawHeaders())
|
|
|
|
if (
|
|
b"Content-Length" in resp_headers
|
|
and int(resp_headers[b"Content-Length"][0]) > max_size
|
|
):
|
|
logger.warning("Requested URL is too large > %r bytes" % (self.max_size,))
|
|
raise SynapseError(
|
|
502,
|
|
"Requested file is too large > %r bytes" % (self.max_size,),
|
|
Codes.TOO_LARGE,
|
|
)
|
|
|
|
if response.code > 299:
|
|
logger.warning("Got %d when downloading %s" % (response.code, url))
|
|
raise SynapseError(502, "Got error %d" % (response.code,), Codes.UNKNOWN)
|
|
|
|
# TODO: if our Content-Type is HTML or something, just read the first
|
|
# N bytes into RAM rather than saving it all to disk only to read it
|
|
# straight back in again
|
|
|
|
try:
|
|
length = await make_deferred_yieldable(
|
|
_readBodyToFile(response, output_stream, max_size)
|
|
)
|
|
except SynapseError:
|
|
# This can happen e.g. because the body is too large.
|
|
raise
|
|
except Exception as e:
|
|
raise SynapseError(502, ("Failed to download remote body: %s" % e)) from e
|
|
|
|
return (
|
|
length,
|
|
resp_headers,
|
|
response.request.absoluteURI.decode("ascii"),
|
|
response.code,
|
|
)
|
|
|
|
|
|
# XXX: FIXME: This is horribly copy-pasted from matrixfederationclient.
|
|
# The two should be factored out.
|
|
|
|
|
|
class _ReadBodyToFileProtocol(protocol.Protocol):
|
|
def __init__(self, stream, deferred, max_size):
|
|
self.stream = stream
|
|
self.deferred = deferred
|
|
self.length = 0
|
|
self.max_size = max_size
|
|
|
|
def dataReceived(self, data):
|
|
self.stream.write(data)
|
|
self.length += len(data)
|
|
if self.max_size is not None and self.length >= self.max_size:
|
|
self.deferred.errback(
|
|
SynapseError(
|
|
502,
|
|
"Requested file is too large > %r bytes" % (self.max_size,),
|
|
Codes.TOO_LARGE,
|
|
)
|
|
)
|
|
self.deferred = defer.Deferred()
|
|
self.transport.loseConnection()
|
|
|
|
def connectionLost(self, reason):
|
|
if reason.check(ResponseDone):
|
|
self.deferred.callback(self.length)
|
|
elif reason.check(PotentialDataLoss):
|
|
# stolen from https://github.com/twisted/treq/pull/49/files
|
|
# http://twistedmatrix.com/trac/ticket/4840
|
|
self.deferred.callback(self.length)
|
|
else:
|
|
self.deferred.errback(reason)
|
|
|
|
|
|
# XXX: FIXME: This is horribly copy-pasted from matrixfederationclient.
|
|
# The two should be factored out.
|
|
|
|
|
|
def _readBodyToFile(response, stream, max_size):
|
|
d = defer.Deferred()
|
|
response.deliverBody(_ReadBodyToFileProtocol(stream, d, max_size))
|
|
return d
|
|
|
|
|
|
def encode_urlencode_args(args):
|
|
return {k: encode_urlencode_arg(v) for k, v in args.items()}
|
|
|
|
|
|
def encode_urlencode_arg(arg):
|
|
if isinstance(arg, str):
|
|
return arg.encode("utf-8")
|
|
elif isinstance(arg, list):
|
|
return [encode_urlencode_arg(i) for i in arg]
|
|
else:
|
|
return arg
|
|
|
|
|
|
def _print_ex(e):
|
|
if hasattr(e, "reasons") and e.reasons:
|
|
for ex in e.reasons:
|
|
_print_ex(ex)
|
|
else:
|
|
logger.exception(e)
|
|
|
|
|
|
class InsecureInterceptableContextFactory(ssl.ContextFactory):
|
|
"""
|
|
Factory for PyOpenSSL SSL contexts which accepts any certificate for any domain.
|
|
|
|
Do not use this since it allows an attacker to intercept your communications.
|
|
"""
|
|
|
|
def __init__(self):
|
|
self._context = SSL.Context(SSL.SSLv23_METHOD)
|
|
self._context.set_verify(VERIFY_NONE, lambda *_: None)
|
|
|
|
def getContext(self, hostname=None, port=None):
|
|
return self._context
|
|
|
|
def creatorForNetloc(self, hostname, port):
|
|
return self
|