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Add ability to blacklist ip ranges for federation traffic (#5043)

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This commit is contained in:
Andrew Morgan 2019-05-13 11:05:06 -07:00 committed by Richard van der Hoff
parent 2e1129b5f7
commit 5a4b328f52
6 changed files with 168 additions and 14 deletions
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1
changelog.d/5043.feature Normal file
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@ -0,0 +1 @@
Add ability to blacklist IP ranges for the federation client.

18
docs/sample_config.yaml
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@ -115,6 +115,24 @@ pid_file: DATADIR/homeserver.pid
# - nyc.example.com
# - syd.example.com
# Prevent federation requests from being sent to the following
# blacklist IP address CIDR ranges. If this option is not specified, or
# specified with an empty list, no ip range blacklist will be enforced.
#
# (0.0.0.0 and :: are always blacklisted, whether or not they are explicitly
# listed here, since they correspond to unroutable addresses.)
#
federation_ip_range_blacklist:
- '127.0.0.0/8'
- '10.0.0.0/8'
- '172.16.0.0/12'
- '192.168.0.0/16'
- '100.64.0.0/10'
- '169.254.0.0/16'
- '::1/128'
- 'fe80::/64'
- 'fc00::/7'
# List of ports that Synapse should listen on, their purpose and their
# configuration.
#

38
synapse/config/server.py
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@ -17,6 +17,8 @@
import logging
import os.path
from netaddr import IPSet
from synapse.http.endpoint import parse_and_validate_server_name
from synapse.python_dependencies import DependencyException, check_requirements
@ -137,6 +139,24 @@ class ServerConfig(Config):
for domain in federation_domain_whitelist:
self.federation_domain_whitelist[domain] = True
self.federation_ip_range_blacklist = config.get(
"federation_ip_range_blacklist", [],
)
# Attempt to create an IPSet from the given ranges
try:
self.federation_ip_range_blacklist = IPSet(
self.federation_ip_range_blacklist
)
# Always blacklist 0.0.0.0, ::
self.federation_ip_range_blacklist.update(["0.0.0.0", "::"])
except Exception as e:
raise ConfigError(
"Invalid range(s) provided in "
"federation_ip_range_blacklist: %s" % e
)
if self.public_baseurl is not None:
if self.public_baseurl[-1] != '/':
self.public_baseurl += '/'
@ -386,6 +406,24 @@ class ServerConfig(Config):
# - nyc.example.com
# - syd.example.com
# Prevent federation requests from being sent to the following
# blacklist IP address CIDR ranges. If this option is not specified, or
# specified with an empty list, no ip range blacklist will be enforced.
#
# (0.0.0.0 and :: are always blacklisted, whether or not they are explicitly
# listed here, since they correspond to unroutable addresses.)
#
federation_ip_range_blacklist:
- '127.0.0.0/8'
- '10.0.0.0/8'
- '172.16.0.0/12'
- '192.168.0.0/16'
- '100.64.0.0/10'
- '169.254.0.0/16'
- '::1/128'
- 'fe80::/64'
- 'fc00::/7'
# List of ports that Synapse should listen on, their purpose and their
# configuration.
#

6
synapse/http/client.py
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@ -165,7 +165,8 @@ class BlacklistingAgentWrapper(Agent):
ip_address, self._ip_whitelist, self._ip_blacklist
):
logger.info(
"Blocking access to %s because of blacklist" % (ip_address,)
"Blocking access to %s due to blacklist" %
(ip_address,)
)
e = SynapseError(403, "IP address blocked by IP blacklist entry")
return defer.fail(Failure(e))
@ -263,9 +264,6 @@ class SimpleHttpClient(object):
uri (str): URI to query.
data (bytes): Data to send in the request body, if applicable.
headers (t.w.http_headers.Headers): Request headers.
Raises:
SynapseError: If the IP is blacklisted.
"""
# A small wrapper around self.agent.request() so we can easily attach
# counters to it

48
synapse/http/matrixfederationclient.py
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@ -27,9 +27,11 @@ import treq
from canonicaljson import encode_canonical_json
from prometheus_client import Counter
from signedjson.sign import sign_json
from zope.interface import implementer
from twisted.internet import defer, protocol
from twisted.internet.error import DNSLookupError
from twisted.internet.interfaces import IReactorPluggableNameResolver
from twisted.internet.task import _EPSILON, Cooperator
from twisted.web._newclient import ResponseDone
from twisted.web.http_headers import Headers
@ -44,6 +46,7 @@ from synapse.api.errors import (
SynapseError,
)
from synapse.http import QuieterFileBodyProducer
from synapse.http.client import BlacklistingAgentWrapper, IPBlacklistingResolver
from synapse.http.federation.matrix_federation_agent import MatrixFederationAgent
from synapse.util.async_helpers import timeout_deferred
from synapse.util.logcontext import make_deferred_yieldable
@ -172,19 +175,44 @@ class MatrixFederationHttpClient(object):
self.hs = hs
self.signing_key = hs.config.signing_key[0]
self.server_name = hs.hostname
reactor = hs.get_reactor()
real_reactor = hs.get_reactor()
# We need to use a DNS resolver which filters out blacklisted IP
# addresses, to prevent DNS rebinding.
nameResolver = IPBlacklistingResolver(
real_reactor, None, hs.config.federation_ip_range_blacklist,
)
@implementer(IReactorPluggableNameResolver)
class Reactor(object):
def __getattr__(_self, attr):
if attr == "nameResolver":
return nameResolver
else:
return getattr(real_reactor, attr)
self.reactor = Reactor()
self.agent = MatrixFederationAgent(
hs.get_reactor(),
self.reactor,
tls_client_options_factory,
)
# Use a BlacklistingAgentWrapper to prevent circumventing the IP
# blacklist via IP literals in server names
self.agent = BlacklistingAgentWrapper(
self.agent, self.reactor,
ip_blacklist=hs.config.federation_ip_range_blacklist,
)
self.clock = hs.get_clock()
self._store = hs.get_datastore()
self.version_string_bytes = hs.version_string.encode('ascii')
self.default_timeout = 60
def schedule(x):
reactor.callLater(_EPSILON, x)
self.reactor.callLater(_EPSILON, x)
self._cooperator = Cooperator(scheduler=schedule)
@ -370,7 +398,7 @@ class MatrixFederationHttpClient(object):
request_deferred = timeout_deferred(
request_deferred,
timeout=_sec_timeout,
reactor=self.hs.get_reactor(),
reactor=self.reactor,
)
response = yield request_deferred
@ -397,7 +425,7 @@ class MatrixFederationHttpClient(object):
d = timeout_deferred(
d,
timeout=_sec_timeout,
reactor=self.hs.get_reactor(),
reactor=self.reactor,
)
try:
@ -586,7 +614,7 @@ class MatrixFederationHttpClient(object):
)
body = yield _handle_json_response(
self.hs.get_reactor(), self.default_timeout, request, response,
self.reactor, self.default_timeout, request, response,
)
defer.returnValue(body)
@ -645,7 +673,7 @@ class MatrixFederationHttpClient(object):
_sec_timeout = self.default_timeout
body = yield _handle_json_response(
self.hs.get_reactor(), _sec_timeout, request, response,
self.reactor, _sec_timeout, request, response,
)
defer.returnValue(body)
@ -704,7 +732,7 @@ class MatrixFederationHttpClient(object):
)
body = yield _handle_json_response(
self.hs.get_reactor(), self.default_timeout, request, response,
self.reactor, self.default_timeout, request, response,
)
defer.returnValue(body)
@ -753,7 +781,7 @@ class MatrixFederationHttpClient(object):
)
body = yield _handle_json_response(
self.hs.get_reactor(), self.default_timeout, request, response,
self.reactor, self.default_timeout, request, response,
)
defer.returnValue(body)
@ -801,7 +829,7 @@ class MatrixFederationHttpClient(object):
try:
d = _readBodyToFile(response, output_stream, max_size)
d.addTimeout(self.default_timeout, self.hs.get_reactor())
d.addTimeout(self.default_timeout, self.reactor)
length = yield make_deferred_yieldable(d)
except Exception as e:
logger.warn(

71
tests/http/test_fedclient.py
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@ -15,6 +15,8 @@
from mock import Mock
from netaddr import IPSet
from twisted.internet import defer
from twisted.internet.defer import TimeoutError
from twisted.internet.error import ConnectingCancelledError, DNSLookupError
@ -209,6 +211,75 @@ class FederationClientTests(HomeserverTestCase):
self.assertIsInstance(f.value, RequestSendFailed)
self.assertIsInstance(f.value.inner_exception, ResponseNeverReceived)
def test_client_ip_range_blacklist(self):
"""Ensure that Synapse does not try to connect to blacklisted IPs"""
# Set up the ip_range blacklist
self.hs.config.federation_ip_range_blacklist = IPSet([
"127.0.0.0/8",
"fe80::/64",
])
self.reactor.lookups["internal"] = "127.0.0.1"
self.reactor.lookups["internalv6"] = "fe80:0:0:0:0:8a2e:370:7337"
self.reactor.lookups["fine"] = "10.20.30.40"
cl = MatrixFederationHttpClient(self.hs, None)
# Try making a GET request to a blacklisted IPv4 address
# ------------------------------------------------------
# Make the request
d = cl.get_json("internal:8008", "foo/bar", timeout=10000)
# Nothing happened yet
self.assertNoResult(d)
self.pump(1)
# Check that it was unable to resolve the address
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 0)
f = self.failureResultOf(d)
self.assertIsInstance(f.value, RequestSendFailed)
self.assertIsInstance(f.value.inner_exception, DNSLookupError)
# Try making a POST request to a blacklisted IPv6 address
# -------------------------------------------------------
# Make the request
d = cl.post_json("internalv6:8008", "foo/bar", timeout=10000)
# Nothing has happened yet
self.assertNoResult(d)
# Move the reactor forwards
self.pump(1)
# Check that it was unable to resolve the address
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 0)
# Check that it was due to a blacklisted DNS lookup
f = self.failureResultOf(d, RequestSendFailed)
self.assertIsInstance(f.value.inner_exception, DNSLookupError)
# Try making a GET request to a non-blacklisted IPv4 address
# ----------------------------------------------------------
# Make the request
d = cl.post_json("fine:8008", "foo/bar", timeout=10000)
# Nothing has happened yet
self.assertNoResult(d)
# Move the reactor forwards
self.pump(1)
# Check that it was able to resolve the address
clients = self.reactor.tcpClients
self.assertNotEqual(len(clients), 0)
# Connection will still fail as this IP address does not resolve to anything
f = self.failureResultOf(d, RequestSendFailed)
self.assertIsInstance(f.value.inner_exception, ConnectingCancelledError)
def test_client_gets_headers(self):
"""
Once the client gets the headers, _request returns successfully.