252 lines
8.9 KiB
Python
252 lines
8.9 KiB
Python
# Copyright 2021 The Matrix.org Foundation C.I.C.
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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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from io import BytesIO
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from typing import Tuple, Union
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from unittest.mock import Mock
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from netaddr import IPSet
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from twisted.internet.defer import Deferred
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from twisted.internet.error import DNSLookupError
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from twisted.python.failure import Failure
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from twisted.test.proto_helpers import AccumulatingProtocol
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from twisted.web.client import Agent, ResponseDone
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from twisted.web.iweb import UNKNOWN_LENGTH
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from synapse.api.errors import SynapseError
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from synapse.http.client import (
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BlacklistingAgentWrapper,
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BlacklistingReactorWrapper,
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BodyExceededMaxSize,
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_DiscardBodyWithMaxSizeProtocol,
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read_body_with_max_size,
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)
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from tests.server import FakeTransport, get_clock
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from tests.unittest import TestCase
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class ReadBodyWithMaxSizeTests(TestCase):
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def _build_response(
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self, length: Union[int, str] = UNKNOWN_LENGTH
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) -> Tuple[BytesIO, "Deferred[int]", _DiscardBodyWithMaxSizeProtocol]:
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"""Start reading the body, returns the response, result and proto"""
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response = Mock(length=length)
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result = BytesIO()
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deferred = read_body_with_max_size(response, result, 6)
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# Fish the protocol out of the response.
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protocol = response.deliverBody.call_args[0][0]
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protocol.transport = Mock()
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return result, deferred, protocol
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def _assert_error(
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self, deferred: "Deferred[int]", protocol: _DiscardBodyWithMaxSizeProtocol
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) -> None:
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"""Ensure that the expected error is received."""
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assert isinstance(deferred.result, Failure)
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self.assertIsInstance(deferred.result.value, BodyExceededMaxSize)
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assert protocol.transport is not None
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# type-ignore: presumably abortConnection has been replaced with a Mock.
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protocol.transport.abortConnection.assert_called_once() # type: ignore[attr-defined]
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def _cleanup_error(self, deferred: "Deferred[int]") -> None:
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"""Ensure that the error in the Deferred is handled gracefully."""
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called = [False]
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def errback(f: Failure) -> None:
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called[0] = True
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deferred.addErrback(errback)
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self.assertTrue(called[0])
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def test_no_error(self) -> None:
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"""A response that is NOT too large."""
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result, deferred, protocol = self._build_response()
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# Start sending data.
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protocol.dataReceived(b"12345")
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# Close the connection.
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protocol.connectionLost(Failure(ResponseDone()))
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self.assertEqual(result.getvalue(), b"12345")
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self.assertEqual(deferred.result, 5)
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def test_too_large(self) -> None:
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"""A response which is too large raises an exception."""
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result, deferred, protocol = self._build_response()
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# Start sending data.
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protocol.dataReceived(b"1234567890")
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self.assertEqual(result.getvalue(), b"1234567890")
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self._assert_error(deferred, protocol)
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self._cleanup_error(deferred)
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def test_multiple_packets(self) -> None:
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"""Data should be accumulated through mutliple packets."""
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result, deferred, protocol = self._build_response()
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# Start sending data.
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protocol.dataReceived(b"12")
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protocol.dataReceived(b"34")
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# Close the connection.
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protocol.connectionLost(Failure(ResponseDone()))
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self.assertEqual(result.getvalue(), b"1234")
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self.assertEqual(deferred.result, 4)
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def test_additional_data(self) -> None:
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"""A connection can receive data after being closed."""
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result, deferred, protocol = self._build_response()
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# Start sending data.
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protocol.dataReceived(b"1234567890")
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self._assert_error(deferred, protocol)
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# More data might have come in.
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protocol.dataReceived(b"1234567890")
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self.assertEqual(result.getvalue(), b"1234567890")
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self._assert_error(deferred, protocol)
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self._cleanup_error(deferred)
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def test_content_length(self) -> None:
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"""The body shouldn't be read (at all) if the Content-Length header is too large."""
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result, deferred, protocol = self._build_response(length=10)
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# Deferred shouldn't be called yet.
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self.assertFalse(deferred.called)
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# Start sending data.
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protocol.dataReceived(b"12345")
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self._assert_error(deferred, protocol)
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self._cleanup_error(deferred)
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# The data is never consumed.
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self.assertEqual(result.getvalue(), b"")
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class BlacklistingAgentTest(TestCase):
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def setUp(self) -> None:
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self.reactor, self.clock = get_clock()
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self.safe_domain, self.safe_ip = b"safe.test", b"1.2.3.4"
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self.unsafe_domain, self.unsafe_ip = b"danger.test", b"5.6.7.8"
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self.allowed_domain, self.allowed_ip = b"allowed.test", b"5.1.1.1"
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# Configure the reactor's DNS resolver.
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for domain, ip in (
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(self.safe_domain, self.safe_ip),
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(self.unsafe_domain, self.unsafe_ip),
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(self.allowed_domain, self.allowed_ip),
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):
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self.reactor.lookups[domain.decode()] = ip.decode()
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self.reactor.lookups[ip.decode()] = ip.decode()
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self.ip_whitelist = IPSet([self.allowed_ip.decode()])
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self.ip_blacklist = IPSet(["5.0.0.0/8"])
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def test_reactor(self) -> None:
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"""Apply the blacklisting reactor and ensure it properly blocks connections to particular domains and IPs."""
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agent = Agent(
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BlacklistingReactorWrapper(
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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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)
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# The unsafe domains and IPs should be rejected.
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for domain in (self.unsafe_domain, self.unsafe_ip):
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self.failureResultOf(
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agent.request(b"GET", b"http://" + domain), DNSLookupError
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)
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# The safe domains IPs should be accepted.
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for domain in (
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self.safe_domain,
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self.allowed_domain,
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self.safe_ip,
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self.allowed_ip,
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):
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d = agent.request(b"GET", b"http://" + domain)
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# Grab the latest TCP connection.
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(
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host,
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port,
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client_factory,
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_timeout,
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_bindAddress,
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) = self.reactor.tcpClients[-1]
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# Make the connection and pump data through it.
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client = client_factory.buildProtocol(None)
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server = AccumulatingProtocol()
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server.makeConnection(FakeTransport(client, self.reactor))
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client.makeConnection(FakeTransport(server, self.reactor))
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client.dataReceived(
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b"HTTP/1.0 200 OK\r\nContent-Length: 0\r\nContent-Type: text/html\r\n\r\n"
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)
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response = self.successResultOf(d)
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self.assertEqual(response.code, 200)
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def test_agent(self) -> None:
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"""Apply the blacklisting agent and ensure it properly blocks connections to particular IPs."""
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agent = BlacklistingAgentWrapper(
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Agent(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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# The unsafe IPs should be rejected.
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self.failureResultOf(
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agent.request(b"GET", b"http://" + self.unsafe_ip), SynapseError
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)
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# The safe and unsafe domains and safe IPs should be accepted.
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for domain in (
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self.safe_domain,
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self.unsafe_domain,
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self.allowed_domain,
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self.safe_ip,
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self.allowed_ip,
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):
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d = agent.request(b"GET", b"http://" + domain)
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# Grab the latest TCP connection.
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(
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host,
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port,
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client_factory,
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_timeout,
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_bindAddress,
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) = self.reactor.tcpClients[-1]
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# Make the connection and pump data through it.
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client = client_factory.buildProtocol(None)
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server = AccumulatingProtocol()
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server.makeConnection(FakeTransport(client, self.reactor))
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client.makeConnection(FakeTransport(server, self.reactor))
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client.dataReceived(
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b"HTTP/1.0 200 OK\r\nContent-Length: 0\r\nContent-Type: text/html\r\n\r\n"
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)
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response = self.successResultOf(d)
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self.assertEqual(response.code, 200)
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