diff --git a/tests/http/test_client.py b/tests/http/test_client.py
index 21ecb81c99..0ce181a51e 100644
--- a/tests/http/test_client.py
+++ b/tests/http/test_client.py
@@ -16,12 +16,23 @@ from io import BytesIO
from mock import Mock
+from netaddr import IPSet
+
+from twisted.internet.error import DNSLookupError
from twisted.python.failure import Failure
-from twisted.web.client import ResponseDone
+from twisted.test.proto_helpers import AccumulatingProtocol
+from twisted.web.client import Agent, ResponseDone
from twisted.web.iweb import UNKNOWN_LENGTH
-from synapse.http.client import BodyExceededMaxSize, read_body_with_max_size
+from synapse.api.errors import SynapseError
+from synapse.http.client import (
+ BlacklistingAgentWrapper,
+ BlacklistingReactorWrapper,
+ BodyExceededMaxSize,
+ read_body_with_max_size,
+)
+from tests.server import FakeTransport, get_clock
from tests.unittest import TestCase
@@ -119,3 +130,114 @@ class ReadBodyWithMaxSizeTests(TestCase):
# The data is never consumed.
self.assertEqual(result.getvalue(), b"")
+
+
+class BlacklistingAgentTest(TestCase):
+ def setUp(self):
+ self.reactor, self.clock = get_clock()
+
+ self.safe_domain, self.safe_ip = b"safe.test", b"1.2.3.4"
+ self.unsafe_domain, self.unsafe_ip = b"danger.test", b"5.6.7.8"
+ self.allowed_domain, self.allowed_ip = b"allowed.test", b"5.1.1.1"
+
+ # Configure the reactor's DNS resolver.
+ for (domain, ip) in (
+ (self.safe_domain, self.safe_ip),
+ (self.unsafe_domain, self.unsafe_ip),
+ (self.allowed_domain, self.allowed_ip),
+ ):
+ self.reactor.lookups[domain.decode()] = ip.decode()
+ self.reactor.lookups[ip.decode()] = ip.decode()
+
+ self.ip_whitelist = IPSet([self.allowed_ip.decode()])
+ self.ip_blacklist = IPSet(["5.0.0.0/8"])
+
+ def test_reactor(self):
+ """Apply the blacklisting reactor and ensure it properly blocks connections to particular domains and IPs."""
+ agent = Agent(
+ BlacklistingReactorWrapper(
+ self.reactor,
+ ip_whitelist=self.ip_whitelist,
+ ip_blacklist=self.ip_blacklist,
+ ),
+ )
+
+ # The unsafe domains and IPs should be rejected.
+ for domain in (self.unsafe_domain, self.unsafe_ip):
+ self.failureResultOf(
+ agent.request(b"GET", b"http://" + domain), DNSLookupError
+ )
+
+ # The safe domains IPs should be accepted.
+ for domain in (
+ self.safe_domain,
+ self.allowed_domain,
+ self.safe_ip,
+ self.allowed_ip,
+ ):
+ d = agent.request(b"GET", b"http://" + domain)
+
+ # Grab the latest TCP connection.
+ (
+ host,
+ port,
+ client_factory,
+ _timeout,
+ _bindAddress,
+ ) = self.reactor.tcpClients[-1]
+
+ # Make the connection and pump data through it.
+ client = client_factory.buildProtocol(None)
+ server = AccumulatingProtocol()
+ server.makeConnection(FakeTransport(client, self.reactor))
+ client.makeConnection(FakeTransport(server, self.reactor))
+ client.dataReceived(
+ b"HTTP/1.0 200 OK\r\nContent-Length: 0\r\nContent-Type: text/html\r\n\r\n"
+ )
+
+ response = self.successResultOf(d)
+ self.assertEqual(response.code, 200)
+
+ def test_agent(self):
+ """Apply the blacklisting agent and ensure it properly blocks connections to particular IPs."""
+ agent = BlacklistingAgentWrapper(
+ Agent(self.reactor),
+ ip_whitelist=self.ip_whitelist,
+ ip_blacklist=self.ip_blacklist,
+ )
+
+ # The unsafe IPs should be rejected.
+ self.failureResultOf(
+ agent.request(b"GET", b"http://" + self.unsafe_ip), SynapseError
+ )
+
+ # The safe and unsafe domains and safe IPs should be accepted.
+ for domain in (
+ self.safe_domain,
+ self.unsafe_domain,
+ self.allowed_domain,
+ self.safe_ip,
+ self.allowed_ip,
+ ):
+ d = agent.request(b"GET", b"http://" + domain)
+
+ # Grab the latest TCP connection.
+ (
+ host,
+ port,
+ client_factory,
+ _timeout,
+ _bindAddress,
+ ) = self.reactor.tcpClients[-1]
+
+ # Make the connection and pump data through it.
+ client = client_factory.buildProtocol(None)
+ server = AccumulatingProtocol()
+ server.makeConnection(FakeTransport(client, self.reactor))
+ client.makeConnection(FakeTransport(server, self.reactor))
+ client.dataReceived(
+ b"HTTP/1.0 200 OK\r\nContent-Length: 0\r\nContent-Type: text/html\r\n\r\n"
+ )
+
+ response = self.successResultOf(d)
+ self.assertEqual(response.code, 200)
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