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#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright 2020 The Matrix.org Foundation C.I.C.
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
from unittest.mock import Mock
from netaddr import IPSet
from twisted.internet import defer
from twisted.internet.error import DNSLookupError
from twisted.internet.testing import MemoryReactor
from synapse.http import RequestTimedOutError
from synapse.http.client import SimpleHttpClient
from synapse.server import HomeServer
from synapse.util.clock import Clock
from tests.unittest import HomeserverTestCase
class SimpleHttpClientTests(HomeserverTestCase):
def prepare(self, reactor: MemoryReactor, clock: Clock, hs: "HomeServer") -> None:
# Add a DNS entry for a test server
self.reactor.lookups["testserv"] = "1.2.3.4"
self.cl = hs.get_simple_http_client()
def test_dns_error(self) -> None:
"""
If the DNS lookup returns an error, it will bubble up.
"""
d = defer.ensureDeferred(self.cl.get_json("http://testserv2:8008/foo/bar"))
self.pump()
f = self.failureResultOf(d)
self.assertIsInstance(f.value, DNSLookupError)
def test_client_connection_refused(self) -> None:
d = defer.ensureDeferred(self.cl.get_json("http://testserv:8008/foo/bar"))
self.pump()
# Nothing happened yet
self.assertNoResult(d)
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
(host, port, factory, _timeout, _bindAddress) = clients[0]
self.assertEqual(host, "1.2.3.4")
self.assertEqual(port, 8008)
e = Exception("go away")
factory.clientConnectionFailed(None, e)
self.pump(0.5)
f = self.failureResultOf(d)
self.assertIs(f.value, e)
def test_client_never_connect(self) -> None:
"""
If the HTTP request is not connected and is timed out, it'll give a
ConnectingCancelledError or TimeoutError.
"""
d = defer.ensureDeferred(self.cl.get_json("http://testserv:8008/foo/bar"))
self.pump()
# Nothing happened yet
self.assertNoResult(d)
# Make sure treq is trying to connect
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
self.assertEqual(clients[0][0], "1.2.3.4")
self.assertEqual(clients[0][1], 8008)
# Deferred is still without a result
self.assertNoResult(d)
# Push by enough to time it out
self.reactor.advance(120)
f = self.failureResultOf(d)
self.assertIsInstance(f.value, RequestTimedOutError)
def test_client_connect_no_response(self) -> None:
"""
If the HTTP request is connected, but gets no response before being
timed out, it'll give a ResponseNeverReceived.
"""
d = defer.ensureDeferred(self.cl.get_json("http://testserv:8008/foo/bar"))
self.pump()
# Nothing happened yet
self.assertNoResult(d)
# Make sure treq is trying to connect
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
self.assertEqual(clients[0][0], "1.2.3.4")
self.assertEqual(clients[0][1], 8008)
conn = Mock()
client = clients[0][2].buildProtocol(None)
client.makeConnection(conn)
# Deferred is still without a result
self.assertNoResult(d)
# Push by enough to time it out
self.reactor.advance(120)
f = self.failureResultOf(d)
self.assertIsInstance(f.value, RequestTimedOutError)
def test_client_ip_range_blocklist(self) -> None:
"""Ensure that Synapse does not try to connect to blocked IPs"""
# Add some DNS entries we'll block
self.reactor.lookups["internal"] = "127.0.0.1"
self.reactor.lookups["internalv6"] = "fe80:0:0:0:0:8a2e:370:7337"
ip_blocklist = IPSet(["127.0.0.0/8", "fe80::/64"])
cl = SimpleHttpClient(self.hs, ip_blocklist=ip_blocklist)
# Try making a GET request to a blocked IPv4 address
# ------------------------------------------------------
# Make the request
d = defer.ensureDeferred(cl.get_json("http://internal:8008/foo/bar"))
self.pump(1)
# Check that it was unable to resolve the address
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 0)
self.failureResultOf(d, DNSLookupError)
# Try making a POST request to a blocked IPv6 address
# -------------------------------------------------------
# Make the request
d = defer.ensureDeferred(
cl.post_json_get_json("http://internalv6:8008/foo/bar", {})
)
# 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 blocked DNS lookup
self.failureResultOf(d, DNSLookupError)
# Try making a GET request to a non-blocked IPv4 address
# ----------------------------------------------------------
# Make the request
d = defer.ensureDeferred(cl.get_json("http://testserv:8008/foo/bar"))
# 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
self.failureResultOf(d, RequestTimedOutError)
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