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synapse/tests/http/test_proxyagent.py
Eric Eastwood 1c802de626
Re-introduce the outbound federation proxy (#15913) 
Allow configuring the set of workers to proxy outbound federation traffic through (`outbound_federation_restricted_to`).

This is useful when you have a worker setup with `federation_sender` instances responsible for sending outbound federation requests and want to make sure *all* outbound federation traffic goes through those instances. Before this change, the generic workers would still contact federation themselves for things like profile lookups, backfill, etc. This PR allows you to set more strict access controls/firewall for all workers and only allow the `federation_sender`'s to contact the outside world.
2023-07-18 09:49:21 +01:00

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# Copyright 2019 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import base64
import logging
import os
from typing import List, Optional
from unittest.mock import patch
import treq
from netaddr import IPSet
from parameterized import parameterized
from twisted.internet import interfaces # noqa: F401
from twisted.internet.endpoints import (
HostnameEndpoint,
_WrapperEndpoint,
_WrappingProtocol,
)
from twisted.internet.interfaces import IProtocol, IProtocolFactory
from twisted.internet.protocol import Factory, Protocol
from twisted.protocols.tls import TLSMemoryBIOFactory, TLSMemoryBIOProtocol
from twisted.web.http import HTTPChannel
from synapse.http.client import BlocklistingReactorWrapper
from synapse.http.connectproxyclient import BasicProxyCredentials
from synapse.http.proxyagent import ProxyAgent, parse_proxy
from tests.http import (
TestServerTLSConnectionFactory,
dummy_address,
get_test_https_policy,
)
from tests.server import FakeTransport, ThreadedMemoryReactorClock
from tests.unittest import TestCase
from tests.utils import checked_cast
logger = logging.getLogger(__name__)
HTTPFactory = Factory.forProtocol(HTTPChannel)
class ProxyParserTests(TestCase):
"""
Values for test
[
proxy_string,
expected_scheme,
expected_hostname,
expected_port,
expected_credentials,
]
"""
@parameterized.expand(
[
# host
[b"localhost", b"http", b"localhost", 1080, None],
[b"localhost:9988", b"http", b"localhost", 9988, None],
# host+scheme
[b"https://localhost", b"https", b"localhost", 1080, None],
[b"https://localhost:1234", b"https", b"localhost", 1234, None],
# ipv4
[b"1.2.3.4", b"http", b"1.2.3.4", 1080, None],
[b"1.2.3.4:9988", b"http", b"1.2.3.4", 9988, None],
# ipv4+scheme
[b"https://1.2.3.4", b"https", b"1.2.3.4", 1080, None],
[b"https://1.2.3.4:9988", b"https", b"1.2.3.4", 9988, None],
# ipv6 - without brackets is broken
# [
# b"2001:0db8:85a3:0000:0000:8a2e:0370:effe",
# b"http",
# b"2001:0db8:85a3:0000:0000:8a2e:0370:effe",
# 1080,
# None,
# ],
# [
# b"2001:0db8:85a3:0000:0000:8a2e:0370:1234",
# b"http",
# b"2001:0db8:85a3:0000:0000:8a2e:0370:1234",
# 1080,
# None,
# ],
# [b"::1", b"http", b"::1", 1080, None],
# [b"::ffff:0.0.0.0", b"http", b"::ffff:0.0.0.0", 1080, None],
# ipv6 - with brackets
[
b"[2001:0db8:85a3:0000:0000:8a2e:0370:effe]",
b"http",
b"2001:0db8:85a3:0000:0000:8a2e:0370:effe",
1080,
None,
],
[
b"[2001:0db8:85a3:0000:0000:8a2e:0370:1234]",
b"http",
b"2001:0db8:85a3:0000:0000:8a2e:0370:1234",
1080,
None,
],
[b"[::1]", b"http", b"::1", 1080, None],
[b"[::ffff:0.0.0.0]", b"http", b"::ffff:0.0.0.0", 1080, None],
# ipv6+port
[
b"[2001:0db8:85a3:0000:0000:8a2e:0370:effe]:9988",
b"http",
b"2001:0db8:85a3:0000:0000:8a2e:0370:effe",
9988,
None,
],
[
b"[2001:0db8:85a3:0000:0000:8a2e:0370:1234]:9988",
b"http",
b"2001:0db8:85a3:0000:0000:8a2e:0370:1234",
9988,
None,
],
[b"[::1]:9988", b"http", b"::1", 9988, None],
[b"[::ffff:0.0.0.0]:9988", b"http", b"::ffff:0.0.0.0", 9988, None],
# ipv6+scheme
[
b"https://[2001:0db8:85a3:0000:0000:8a2e:0370:effe]",
b"https",
b"2001:0db8:85a3:0000:0000:8a2e:0370:effe",
1080,
None,
],
[
b"https://[2001:0db8:85a3:0000:0000:8a2e:0370:1234]",
b"https",
b"2001:0db8:85a3:0000:0000:8a2e:0370:1234",
1080,
None,
],
[b"https://[::1]", b"https", b"::1", 1080, None],
[b"https://[::ffff:0.0.0.0]", b"https", b"::ffff:0.0.0.0", 1080, None],
# ipv6+scheme+port
[
b"https://[2001:0db8:85a3:0000:0000:8a2e:0370:effe]:9988",
b"https",
b"2001:0db8:85a3:0000:0000:8a2e:0370:effe",
9988,
None,
],
[
b"https://[2001:0db8:85a3:0000:0000:8a2e:0370:1234]:9988",
b"https",
b"2001:0db8:85a3:0000:0000:8a2e:0370:1234",
9988,
None,
],
[b"https://[::1]:9988", b"https", b"::1", 9988, None],
# with credentials
[
b"https://user:pass@1.2.3.4:9988",
b"https",
b"1.2.3.4",
9988,
b"user:pass",
],
[b"user:pass@1.2.3.4:9988", b"http", b"1.2.3.4", 9988, b"user:pass"],
[
b"https://user:pass@proxy.local:9988",
b"https",
b"proxy.local",
9988,
b"user:pass",
],
[
b"user:pass@proxy.local:9988",
b"http",
b"proxy.local",
9988,
b"user:pass",
],
]
)
def test_parse_proxy(
self,
proxy_string: bytes,
expected_scheme: bytes,
expected_hostname: bytes,
expected_port: int,
expected_credentials: Optional[bytes],
) -> None:
"""
Tests that a given proxy URL will be broken into the components.
Args:
proxy_string: The proxy connection string.
expected_scheme: Expected value of proxy scheme.
expected_hostname: Expected value of proxy hostname.
expected_port: Expected value of proxy port.
expected_credentials: Expected value of credentials.
Must be in form '<username>:<password>' or None
"""
proxy_cred = None
if expected_credentials:
proxy_cred = BasicProxyCredentials(expected_credentials)
self.assertEqual(
(
expected_scheme,
expected_hostname,
expected_port,
proxy_cred,
),
parse_proxy(proxy_string),
)
class MatrixFederationAgentTests(TestCase):
def setUp(self) -> None:
self.reactor = ThreadedMemoryReactorClock()
def _make_connection(
self,
client_factory: IProtocolFactory,
server_factory: IProtocolFactory,
ssl: bool = False,
expected_sni: Optional[bytes] = None,
tls_sanlist: Optional[List[bytes]] = None,
) -> IProtocol:
"""Builds a test server, and completes the outgoing client connection
Args:
client_factory: the the factory that the
application is trying to use to make the outbound connection. We will
invoke it to build the client Protocol
server_factory: a factory to build the
server-side protocol
ssl: If true, we will expect an ssl connection and wrap
server_factory with a TLSMemoryBIOFactory
expected_sni: the expected SNI value
tls_sanlist: list of SAN entries for the TLS cert presented by the server.
Defaults to [b'DNS:test.com']
Returns:
the server Protocol returned by server_factory
"""
if ssl:
server_factory = _wrap_server_factory_for_tls(server_factory, tls_sanlist)
server_protocol = server_factory.buildProtocol(dummy_address)
assert server_protocol is not None
# now, tell the client protocol factory to build the client protocol,
# and wire the output of said protocol up to the server via
# a FakeTransport.
#
# Normally this would be done by the TCP socket code in Twisted, but we are
# stubbing that out here.
client_protocol = client_factory.buildProtocol(dummy_address)
assert client_protocol is not None
client_protocol.makeConnection(
FakeTransport(server_protocol, self.reactor, client_protocol)
)
# tell the server protocol to send its stuff back to the client, too
server_protocol.makeConnection(
FakeTransport(client_protocol, self.reactor, server_protocol)
)
if ssl:
assert isinstance(server_protocol, TLSMemoryBIOProtocol)
http_protocol = server_protocol.wrappedProtocol
tls_connection = server_protocol._tlsConnection
else:
http_protocol = server_protocol
tls_connection = None
# give the reactor a pump to get the TLS juices flowing (if needed)
self.reactor.advance(0)
if expected_sni is not None:
server_name = tls_connection.get_servername()
self.assertEqual(
server_name,
expected_sni,
f"Expected SNI {expected_sni!s} but got {server_name!s}",
)
return http_protocol
def _test_request_direct_connection(
self,
agent: ProxyAgent,
scheme: bytes,
hostname: bytes,
path: bytes,
) -> None:
"""Runs a test case for a direct connection not going through a proxy.
Args:
agent: the proxy agent being tested
scheme: expected to be either "http" or "https"
hostname: the hostname to connect to in the test
path: the path to connect to in the test
"""
is_https = scheme == b"https"
self.reactor.lookups[hostname.decode()] = "1.2.3.4"
d = agent.request(b"GET", scheme + b"://" + hostname + b"/" + path)
# there should be a pending TCP connection
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
(host, port, client_factory, _timeout, _bindAddress) = clients[0]
self.assertEqual(host, "1.2.3.4")
self.assertEqual(port, 443 if is_https else 80)
# make a test server, and wire up the client
http_server = self._make_connection(
client_factory,
_get_test_protocol_factory(),
ssl=is_https,
expected_sni=hostname if is_https else None,
)
assert isinstance(http_server, HTTPChannel)
# the FakeTransport is async, so we need to pump the reactor
self.reactor.advance(0)
# now there should be a pending request
self.assertEqual(len(http_server.requests), 1)
request = http_server.requests[0]
self.assertEqual(request.method, b"GET")
self.assertEqual(request.path, b"/" + path)
self.assertEqual(request.requestHeaders.getRawHeaders(b"host"), [hostname])
request.write(b"result")
request.finish()
self.reactor.advance(0)
resp = self.successResultOf(d)
body = self.successResultOf(treq.content(resp))
self.assertEqual(body, b"result")
def test_http_request(self) -> None:
agent = ProxyAgent(self.reactor)
self._test_request_direct_connection(agent, b"http", b"test.com", b"")
def test_https_request(self) -> None:
agent = ProxyAgent(self.reactor, contextFactory=get_test_https_policy())
self._test_request_direct_connection(agent, b"https", b"test.com", b"abc")
def test_http_request_use_proxy_empty_environment(self) -> None:
agent = ProxyAgent(self.reactor, use_proxy=True)
self._test_request_direct_connection(agent, b"http", b"test.com", b"")
@patch.dict(os.environ, {"http_proxy": "proxy.com:8888", "NO_PROXY": "test.com"})
def test_http_request_via_uppercase_no_proxy(self) -> None:
agent = ProxyAgent(self.reactor, use_proxy=True)
self._test_request_direct_connection(agent, b"http", b"test.com", b"")
@patch.dict(
os.environ, {"http_proxy": "proxy.com:8888", "no_proxy": "test.com,unused.com"}
)
def test_http_request_via_no_proxy(self) -> None:
agent = ProxyAgent(self.reactor, use_proxy=True)
self._test_request_direct_connection(agent, b"http", b"test.com", b"")
@patch.dict(
os.environ, {"https_proxy": "proxy.com", "no_proxy": "test.com,unused.com"}
)
def test_https_request_via_no_proxy(self) -> None:
agent = ProxyAgent(
self.reactor,
contextFactory=get_test_https_policy(),
use_proxy=True,
)
self._test_request_direct_connection(agent, b"https", b"test.com", b"abc")
@patch.dict(os.environ, {"http_proxy": "proxy.com:8888", "no_proxy": "*"})
def test_http_request_via_no_proxy_star(self) -> None:
agent = ProxyAgent(self.reactor, use_proxy=True)
self._test_request_direct_connection(agent, b"http", b"test.com", b"")
@patch.dict(os.environ, {"https_proxy": "proxy.com", "no_proxy": "*"})
def test_https_request_via_no_proxy_star(self) -> None:
agent = ProxyAgent(
self.reactor,
contextFactory=get_test_https_policy(),
use_proxy=True,
)
self._test_request_direct_connection(agent, b"https", b"test.com", b"abc")
@patch.dict(os.environ, {"http_proxy": "proxy.com:8888", "no_proxy": "unused.com"})
def test_http_request_via_proxy(self) -> None:
"""
Tests that requests can be made through a proxy.
"""
self._do_http_request_via_proxy(
expect_proxy_ssl=False, expected_auth_credentials=None
)
@patch.dict(
os.environ,
{"http_proxy": "bob:pinkponies@proxy.com:8888", "no_proxy": "unused.com"},
)
def test_http_request_via_proxy_with_auth(self) -> None:
"""
Tests that authenticated requests can be made through a proxy.
"""
self._do_http_request_via_proxy(
expect_proxy_ssl=False, expected_auth_credentials=b"bob:pinkponies"
)
@patch.dict(
os.environ, {"http_proxy": "https://proxy.com:8888", "no_proxy": "unused.com"}
)
def test_http_request_via_https_proxy(self) -> None:
self._do_http_request_via_proxy(
expect_proxy_ssl=True, expected_auth_credentials=None
)
@patch.dict(
os.environ,
{
"http_proxy": "https://bob:pinkponies@proxy.com:8888",
"no_proxy": "unused.com",
},
)
def test_http_request_via_https_proxy_with_auth(self) -> None:
self._do_http_request_via_proxy(
expect_proxy_ssl=True, expected_auth_credentials=b"bob:pinkponies"
)
@patch.dict(os.environ, {"https_proxy": "proxy.com", "no_proxy": "unused.com"})
def test_https_request_via_proxy(self) -> None:
"""Tests that TLS-encrypted requests can be made through a proxy"""
self._do_https_request_via_proxy(
expect_proxy_ssl=False, expected_auth_credentials=None
)
@patch.dict(
os.environ,
{"https_proxy": "bob:pinkponies@proxy.com", "no_proxy": "unused.com"},
)
def test_https_request_via_proxy_with_auth(self) -> None:
"""Tests that authenticated, TLS-encrypted requests can be made through a proxy"""
self._do_https_request_via_proxy(
expect_proxy_ssl=False, expected_auth_credentials=b"bob:pinkponies"
)
@patch.dict(
os.environ, {"https_proxy": "https://proxy.com", "no_proxy": "unused.com"}
)
def test_https_request_via_https_proxy(self) -> None:
"""Tests that TLS-encrypted requests can be made through a proxy"""
self._do_https_request_via_proxy(
expect_proxy_ssl=True, expected_auth_credentials=None
)
@patch.dict(
os.environ,
{"https_proxy": "https://bob:pinkponies@proxy.com", "no_proxy": "unused.com"},
)
def test_https_request_via_https_proxy_with_auth(self) -> None:
"""Tests that authenticated, TLS-encrypted requests can be made through a proxy"""
self._do_https_request_via_proxy(
expect_proxy_ssl=True, expected_auth_credentials=b"bob:pinkponies"
)
def _do_http_request_via_proxy(
self,
expect_proxy_ssl: bool = False,
expected_auth_credentials: Optional[bytes] = None,
) -> None:
"""Send a http request via an agent and check that it is correctly received at
the proxy. The proxy can use either http or https.
Args:
expect_proxy_ssl: True if we expect the request to connect via https to proxy
expected_auth_credentials: credentials to authenticate at proxy
"""
if expect_proxy_ssl:
agent = ProxyAgent(
self.reactor, use_proxy=True, contextFactory=get_test_https_policy()
)
else:
agent = ProxyAgent(self.reactor, use_proxy=True)
self.reactor.lookups["proxy.com"] = "1.2.3.5"
d = agent.request(b"GET", b"http://test.com")
# there should be a pending TCP connection
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
(host, port, client_factory, _timeout, _bindAddress) = clients[0]
self.assertEqual(host, "1.2.3.5")
self.assertEqual(port, 8888)
# make a test server, and wire up the client
http_server = self._make_connection(
client_factory,
_get_test_protocol_factory(),
ssl=expect_proxy_ssl,
tls_sanlist=[b"DNS:proxy.com"] if expect_proxy_ssl else None,
expected_sni=b"proxy.com" if expect_proxy_ssl else None,
)
assert isinstance(http_server, HTTPChannel)
# the FakeTransport is async, so we need to pump the reactor
self.reactor.advance(0)
# now there should be a pending request
self.assertEqual(len(http_server.requests), 1)
request = http_server.requests[0]
# Check whether auth credentials have been supplied to the proxy
proxy_auth_header_values = request.requestHeaders.getRawHeaders(
b"Proxy-Authorization"
)
if expected_auth_credentials is not None:
# Compute the correct header value for Proxy-Authorization
encoded_credentials = base64.b64encode(expected_auth_credentials)
expected_header_value = b"Basic " + encoded_credentials
# Validate the header's value
self.assertIn(expected_header_value, proxy_auth_header_values)
else:
# Check that the Proxy-Authorization header has not been supplied to the proxy
self.assertIsNone(proxy_auth_header_values)
self.assertEqual(request.method, b"GET")
self.assertEqual(request.path, b"http://test.com")
self.assertEqual(request.requestHeaders.getRawHeaders(b"host"), [b"test.com"])
request.write(b"result")
request.finish()
self.reactor.advance(0)
resp = self.successResultOf(d)
body = self.successResultOf(treq.content(resp))
self.assertEqual(body, b"result")
def _do_https_request_via_proxy(
self,
expect_proxy_ssl: bool = False,
expected_auth_credentials: Optional[bytes] = None,
) -> None:
"""Send a https request via an agent and check that it is correctly received at
the proxy and client. The proxy can use either http or https.
Args:
expect_proxy_ssl: True if we expect the request to connect via https to proxy
expected_auth_credentials: credentials to authenticate at proxy
"""
agent = ProxyAgent(
self.reactor,
contextFactory=get_test_https_policy(),
use_proxy=True,
)
self.reactor.lookups["proxy.com"] = "1.2.3.5"
d = agent.request(b"GET", b"https://test.com/abc")
# there should be a pending TCP connection
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
(host, port, client_factory, _timeout, _bindAddress) = clients[0]
self.assertEqual(host, "1.2.3.5")
self.assertEqual(port, 1080)
# make a test server to act as the proxy, and wire up the client
proxy_server = self._make_connection(
client_factory,
_get_test_protocol_factory(),
ssl=expect_proxy_ssl,
tls_sanlist=[b"DNS:proxy.com"] if expect_proxy_ssl else None,
expected_sni=b"proxy.com" if expect_proxy_ssl else None,
)
assert isinstance(proxy_server, HTTPChannel)
# now there should be a pending CONNECT request
self.assertEqual(len(proxy_server.requests), 1)
request = proxy_server.requests[0]
self.assertEqual(request.method, b"CONNECT")
self.assertEqual(request.path, b"test.com:443")
# Check whether auth credentials have been supplied to the proxy
proxy_auth_header_values = request.requestHeaders.getRawHeaders(
b"Proxy-Authorization"
)
if expected_auth_credentials is not None:
# Compute the correct header value for Proxy-Authorization
encoded_credentials = base64.b64encode(expected_auth_credentials)
expected_header_value = b"Basic " + encoded_credentials
# Validate the header's value
self.assertIn(expected_header_value, proxy_auth_header_values)
else:
# Check that the Proxy-Authorization header has not been supplied to the proxy
self.assertIsNone(proxy_auth_header_values)
# tell the proxy server not to close the connection
proxy_server.persistent = True
request.finish()
# now we make another test server to act as the upstream HTTP server.
server_ssl_protocol = _wrap_server_factory_for_tls(
_get_test_protocol_factory()
).buildProtocol(dummy_address)
# Tell the HTTP server to send outgoing traffic back via the proxy's transport.
proxy_server_transport = proxy_server.transport
assert proxy_server_transport is not None
server_ssl_protocol.makeConnection(proxy_server_transport)
# ... and replace the protocol on the proxy's transport with the
# TLSMemoryBIOProtocol for the test server, so that incoming traffic
# to the proxy gets sent over to the HTTP(s) server.
#
# This needs a bit of gut-wrenching, which is different depending on whether
# the proxy is using TLS or not.
#
# (an alternative, possibly more elegant, approach would be to use a custom
# Protocol to implement the proxy, which starts out by forwarding to an
# HTTPChannel (to implement the CONNECT command) and can then be switched
# into a mode where it forwards its traffic to another Protocol.)
if expect_proxy_ssl:
assert isinstance(proxy_server_transport, TLSMemoryBIOProtocol)
proxy_server_transport.wrappedProtocol = server_ssl_protocol
else:
assert isinstance(proxy_server_transport, FakeTransport)
client_protocol = proxy_server_transport.other
assert isinstance(client_protocol, Protocol)
c2s_transport = checked_cast(FakeTransport, client_protocol.transport)
c2s_transport.other = server_ssl_protocol
self.reactor.advance(0)
server_name = server_ssl_protocol._tlsConnection.get_servername()
expected_sni = b"test.com"
self.assertEqual(
server_name,
expected_sni,
f"Expected SNI {expected_sni!s} but got {server_name!s}",
)
# now there should be a pending request
http_server = server_ssl_protocol.wrappedProtocol
assert isinstance(http_server, HTTPChannel)
self.assertEqual(len(http_server.requests), 1)
request = http_server.requests[0]
self.assertEqual(request.method, b"GET")
self.assertEqual(request.path, b"/abc")
self.assertEqual(request.requestHeaders.getRawHeaders(b"host"), [b"test.com"])
# Check that the destination server DID NOT receive proxy credentials
proxy_auth_header_values = request.requestHeaders.getRawHeaders(
b"Proxy-Authorization"
)
self.assertIsNone(proxy_auth_header_values)
request.write(b"result")
request.finish()
self.reactor.advance(0)
resp = self.successResultOf(d)
body = self.successResultOf(treq.content(resp))
self.assertEqual(body, b"result")
@patch.dict(os.environ, {"http_proxy": "proxy.com:8888"})
def test_http_request_via_proxy_with_blocklist(self) -> None:
# The blocklist includes the configured proxy IP.
agent = ProxyAgent(
BlocklistingReactorWrapper(
self.reactor, ip_allowlist=None, ip_blocklist=IPSet(["1.0.0.0/8"])
),
self.reactor,
use_proxy=True,
)
self.reactor.lookups["proxy.com"] = "1.2.3.5"
d = agent.request(b"GET", b"http://test.com")
# there should be a pending TCP connection
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
(host, port, client_factory, _timeout, _bindAddress) = clients[0]
self.assertEqual(host, "1.2.3.5")
self.assertEqual(port, 8888)
# make a test server, and wire up the client
http_server = self._make_connection(
client_factory, _get_test_protocol_factory()
)
assert isinstance(http_server, HTTPChannel)
# the FakeTransport is async, so we need to pump the reactor
self.reactor.advance(0)
# now there should be a pending request
self.assertEqual(len(http_server.requests), 1)
request = http_server.requests[0]
self.assertEqual(request.method, b"GET")
self.assertEqual(request.path, b"http://test.com")
self.assertEqual(request.requestHeaders.getRawHeaders(b"host"), [b"test.com"])
request.write(b"result")
request.finish()
self.reactor.advance(0)
resp = self.successResultOf(d)
body = self.successResultOf(treq.content(resp))
self.assertEqual(body, b"result")
@patch.dict(os.environ, {"HTTPS_PROXY": "proxy.com"})
def test_https_request_via_uppercase_proxy_with_blocklist(self) -> None:
# The blocklist includes the configured proxy IP.
agent = ProxyAgent(
BlocklistingReactorWrapper(
self.reactor, ip_allowlist=None, ip_blocklist=IPSet(["1.0.0.0/8"])
),
self.reactor,
contextFactory=get_test_https_policy(),
use_proxy=True,
)
self.reactor.lookups["proxy.com"] = "1.2.3.5"
d = agent.request(b"GET", b"https://test.com/abc")
# there should be a pending TCP connection
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
(host, port, client_factory, _timeout, _bindAddress) = clients[0]
self.assertEqual(host, "1.2.3.5")
self.assertEqual(port, 1080)
# make a test HTTP server, and wire up the client
proxy_server = self._make_connection(
client_factory, _get_test_protocol_factory()
)
assert isinstance(proxy_server, HTTPChannel)
# fish the transports back out so that we can do the old switcheroo
# To help mypy out with the various Protocols and wrappers and mocks, we do
# some explicit casting. Without the casts, we hit the bug I reported at
# https://github.com/Shoobx/mypy-zope/issues/91 .
# We also double-checked these casts at runtime (test-time) because I found it
# quite confusing to deduce these types in the first place!
s2c_transport = checked_cast(FakeTransport, proxy_server.transport)
client_protocol = checked_cast(_WrappingProtocol, s2c_transport.other)
c2s_transport = checked_cast(FakeTransport, client_protocol.transport)
# the FakeTransport is async, so we need to pump the reactor
self.reactor.advance(0)
# now there should be a pending CONNECT request
self.assertEqual(len(proxy_server.requests), 1)
request = proxy_server.requests[0]
self.assertEqual(request.method, b"CONNECT")
self.assertEqual(request.path, b"test.com:443")
# tell the proxy server not to close the connection
proxy_server.persistent = True
# this just stops the http Request trying to do a chunked response
# request.setHeader(b"Content-Length", b"0")
request.finish()
# now we can replace the proxy channel with a new, SSL-wrapped HTTP channel
ssl_factory = _wrap_server_factory_for_tls(_get_test_protocol_factory())
ssl_protocol = ssl_factory.buildProtocol(dummy_address)
assert isinstance(ssl_protocol, TLSMemoryBIOProtocol)
http_server = ssl_protocol.wrappedProtocol
assert isinstance(http_server, HTTPChannel)
ssl_protocol.makeConnection(
FakeTransport(client_protocol, self.reactor, ssl_protocol)
)
c2s_transport.other = ssl_protocol
self.reactor.advance(0)
server_name = ssl_protocol._tlsConnection.get_servername()
expected_sni = b"test.com"
self.assertEqual(
server_name,
expected_sni,
f"Expected SNI {expected_sni!s} but got {server_name!s}",
)
# now there should be a pending request
self.assertEqual(len(http_server.requests), 1)
request = http_server.requests[0]
self.assertEqual(request.method, b"GET")
self.assertEqual(request.path, b"/abc")
self.assertEqual(request.requestHeaders.getRawHeaders(b"host"), [b"test.com"])
request.write(b"result")
request.finish()
self.reactor.advance(0)
resp = self.successResultOf(d)
body = self.successResultOf(treq.content(resp))
self.assertEqual(body, b"result")
@patch.dict(os.environ, {"http_proxy": "proxy.com:8888"})
def test_proxy_with_no_scheme(self) -> None:
http_proxy_agent = ProxyAgent(self.reactor, use_proxy=True)
proxy_ep = checked_cast(HostnameEndpoint, http_proxy_agent.http_proxy_endpoint)
self.assertEqual(proxy_ep._hostStr, "proxy.com")
self.assertEqual(proxy_ep._port, 8888)
@patch.dict(os.environ, {"http_proxy": "socks://proxy.com:8888"})
def test_proxy_with_unsupported_scheme(self) -> None:
with self.assertRaises(ValueError):
ProxyAgent(self.reactor, use_proxy=True)
@patch.dict(os.environ, {"http_proxy": "http://proxy.com:8888"})
def test_proxy_with_http_scheme(self) -> None:
http_proxy_agent = ProxyAgent(self.reactor, use_proxy=True)
proxy_ep = checked_cast(HostnameEndpoint, http_proxy_agent.http_proxy_endpoint)
self.assertEqual(proxy_ep._hostStr, "proxy.com")
self.assertEqual(proxy_ep._port, 8888)
@patch.dict(os.environ, {"http_proxy": "https://proxy.com:8888"})
def test_proxy_with_https_scheme(self) -> None:
https_proxy_agent = ProxyAgent(self.reactor, use_proxy=True)
proxy_ep = checked_cast(_WrapperEndpoint, https_proxy_agent.http_proxy_endpoint)
self.assertEqual(proxy_ep._wrappedEndpoint._hostStr, "proxy.com")
self.assertEqual(proxy_ep._wrappedEndpoint._port, 8888)
def _wrap_server_factory_for_tls(
factory: IProtocolFactory, sanlist: Optional[List[bytes]] = None
) -> TLSMemoryBIOFactory:
"""Wrap an existing Protocol Factory with a test TLSMemoryBIOFactory
The resultant factory will create a TLS server which presents a certificate
signed by our test CA, valid for the domains in `sanlist`
Args:
factory: protocol factory to wrap
sanlist: list of domains the cert should be valid for
Returns:
interfaces.IProtocolFactory
"""
if sanlist is None:
sanlist = [b"DNS:test.com"]
connection_creator = TestServerTLSConnectionFactory(sanlist=sanlist)
return TLSMemoryBIOFactory(
connection_creator, isClient=False, wrappedFactory=factory
)
def _get_test_protocol_factory() -> IProtocolFactory:
"""Get a protocol Factory which will build an HTTPChannel
Returns:
interfaces.IProtocolFactory
"""
server_factory = Factory.forProtocol(HTTPChannel)
# Request.finish expects the factory to have a 'log' method.
server_factory.log = _log_request
return server_factory
def _log_request(request: str) -> None:
"""Implements Factory.log, which is expected by Request.finish"""
logger.info(f"Completed request {request}")
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