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![Erik Johnston](/assets/img/avatar_default.png)
During the migration the automated script to update the copyright headers accidentally got rid of some of the existing copyright lines. Reinstate them.
303 lines
10 KiB
Python
303 lines
10 KiB
Python
#
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# This file is licensed under the Affero General Public License (AGPL) version 3.
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#
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# Copyright 2019 The Matrix.org Foundation C.I.C.
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# Copyright (C) 2023 New Vector, Ltd
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# See the GNU Affero General Public License for more details:
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# <https://www.gnu.org/licenses/agpl-3.0.html>.
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#
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# Originally licensed under the Apache License, Version 2.0:
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# <http://www.apache.org/licenses/LICENSE-2.0>.
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#
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# [This file includes modifications made by New Vector Limited]
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#
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#
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import abc
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import base64
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import logging
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from typing import Optional, Union
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import attr
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from zope.interface import implementer
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from twisted.internet import defer, protocol
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from twisted.internet.error import ConnectError
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from twisted.internet.interfaces import (
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IAddress,
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IConnector,
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IProtocol,
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IReactorCore,
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IStreamClientEndpoint,
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)
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from twisted.internet.protocol import ClientFactory, Protocol, connectionDone
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from twisted.python.failure import Failure
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from twisted.web import http
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logger = logging.getLogger(__name__)
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class ProxyConnectError(ConnectError):
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pass
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class ProxyCredentials:
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@abc.abstractmethod
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def as_proxy_authorization_value(self) -> bytes:
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raise NotImplementedError()
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@attr.s(auto_attribs=True)
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class BasicProxyCredentials(ProxyCredentials):
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username_password: bytes
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def as_proxy_authorization_value(self) -> bytes:
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"""
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Return the value for a Proxy-Authorization header (i.e. 'Basic abdef==').
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Returns:
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A transformation of the authentication string the encoded value for
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a Proxy-Authorization header.
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"""
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# Encode as base64 and prepend the authorization type
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return b"Basic " + base64.b64encode(self.username_password)
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@attr.s(auto_attribs=True)
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class BearerProxyCredentials(ProxyCredentials):
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access_token: bytes
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def as_proxy_authorization_value(self) -> bytes:
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"""
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Return the value for a Proxy-Authorization header (i.e. 'Bearer xxx').
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"""
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return b"Bearer " + self.access_token
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@implementer(IStreamClientEndpoint)
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class HTTPConnectProxyEndpoint:
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"""An Endpoint implementation which will send a CONNECT request to an http proxy
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Wraps an existing HostnameEndpoint for the proxy.
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When we get the connect() request from the connection pool (via the TLS wrapper),
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we'll first connect to the proxy endpoint with a ProtocolFactory which will make the
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CONNECT request. Once that completes, we invoke the protocolFactory which was passed
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in.
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Args:
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reactor: the Twisted reactor to use for the connection
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proxy_endpoint: the endpoint to use to connect to the proxy
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host: hostname that we want to CONNECT to
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port: port that we want to connect to
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proxy_creds: credentials to authenticate at proxy
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"""
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def __init__(
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self,
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reactor: IReactorCore,
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proxy_endpoint: IStreamClientEndpoint,
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host: bytes,
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port: int,
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proxy_creds: Optional[ProxyCredentials],
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):
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self._reactor = reactor
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self._proxy_endpoint = proxy_endpoint
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self._host = host
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self._port = port
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self._proxy_creds = proxy_creds
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def __repr__(self) -> str:
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return "<HTTPConnectProxyEndpoint %s>" % (self._proxy_endpoint,)
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# Mypy encounters a false positive here: it complains that ClientFactory
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# is incompatible with IProtocolFactory. But ClientFactory inherits from
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# Factory, which implements IProtocolFactory. So I think this is a bug
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# in mypy-zope.
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def connect(self, protocolFactory: ClientFactory) -> "defer.Deferred[IProtocol]": # type: ignore[override]
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f = HTTPProxiedClientFactory(
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self._host, self._port, protocolFactory, self._proxy_creds
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)
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d = self._proxy_endpoint.connect(f)
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# once the tcp socket connects successfully, we need to wait for the
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# CONNECT to complete.
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d.addCallback(lambda conn: f.on_connection)
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return d
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class HTTPProxiedClientFactory(protocol.ClientFactory):
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"""ClientFactory wrapper that triggers an HTTP proxy CONNECT on connect.
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Once the CONNECT completes, invokes the original ClientFactory to build the
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HTTP Protocol object and run the rest of the connection.
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Args:
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dst_host: hostname that we want to CONNECT to
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dst_port: port that we want to connect to
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wrapped_factory: The original Factory
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proxy_creds: credentials to authenticate at proxy
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"""
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def __init__(
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self,
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dst_host: bytes,
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dst_port: int,
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wrapped_factory: ClientFactory,
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proxy_creds: Optional[ProxyCredentials],
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):
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self.dst_host = dst_host
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self.dst_port = dst_port
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self.wrapped_factory = wrapped_factory
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self.proxy_creds = proxy_creds
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self.on_connection: "defer.Deferred[None]" = defer.Deferred()
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def startedConnecting(self, connector: IConnector) -> None:
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return self.wrapped_factory.startedConnecting(connector)
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def buildProtocol(self, addr: IAddress) -> "HTTPConnectProtocol":
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wrapped_protocol = self.wrapped_factory.buildProtocol(addr)
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if wrapped_protocol is None:
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raise TypeError("buildProtocol produced None instead of a Protocol")
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return HTTPConnectProtocol(
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self.dst_host,
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self.dst_port,
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wrapped_protocol,
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self.on_connection,
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self.proxy_creds,
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)
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def clientConnectionFailed(self, connector: IConnector, reason: Failure) -> None:
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logger.debug("Connection to proxy failed: %s", reason)
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if not self.on_connection.called:
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self.on_connection.errback(reason)
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return self.wrapped_factory.clientConnectionFailed(connector, reason)
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def clientConnectionLost(self, connector: IConnector, reason: Failure) -> None:
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logger.debug("Connection to proxy lost: %s", reason)
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if not self.on_connection.called:
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self.on_connection.errback(reason)
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return self.wrapped_factory.clientConnectionLost(connector, reason)
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class HTTPConnectProtocol(protocol.Protocol):
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"""Protocol that wraps an existing Protocol to do a CONNECT handshake at connect
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Args:
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host: The original HTTP(s) hostname or IPv4 or IPv6 address literal
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to put in the CONNECT request
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port: The original HTTP(s) port to put in the CONNECT request
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wrapped_protocol: the original protocol (probably HTTPChannel or
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TLSMemoryBIOProtocol, but could be anything really)
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connected_deferred: a Deferred which will be callbacked with
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wrapped_protocol when the CONNECT completes
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proxy_creds: credentials to authenticate at proxy
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"""
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def __init__(
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self,
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host: bytes,
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port: int,
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wrapped_protocol: Protocol,
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connected_deferred: defer.Deferred,
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proxy_creds: Optional[ProxyCredentials],
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):
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self.host = host
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self.port = port
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self.wrapped_protocol = wrapped_protocol
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self.connected_deferred = connected_deferred
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self.proxy_creds = proxy_creds
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self.http_setup_client = HTTPConnectSetupClient(
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self.host, self.port, self.proxy_creds
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)
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self.http_setup_client.on_connected.addCallback(self.proxyConnected)
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def connectionMade(self) -> None:
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self.http_setup_client.makeConnection(self.transport)
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def connectionLost(self, reason: Failure = connectionDone) -> None:
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if self.wrapped_protocol.connected:
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self.wrapped_protocol.connectionLost(reason)
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self.http_setup_client.connectionLost(reason)
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if not self.connected_deferred.called:
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self.connected_deferred.errback(reason)
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def proxyConnected(self, _: Union[None, "defer.Deferred[None]"]) -> None:
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self.wrapped_protocol.makeConnection(self.transport)
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self.connected_deferred.callback(self.wrapped_protocol)
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# Get any pending data from the http buf and forward it to the original protocol
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buf = self.http_setup_client.clearLineBuffer()
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if buf:
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self.wrapped_protocol.dataReceived(buf)
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def dataReceived(self, data: bytes) -> None:
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# if we've set up the HTTP protocol, we can send the data there
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if self.wrapped_protocol.connected:
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return self.wrapped_protocol.dataReceived(data)
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# otherwise, we must still be setting up the connection: send the data to the
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# setup client
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return self.http_setup_client.dataReceived(data)
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class HTTPConnectSetupClient(http.HTTPClient):
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"""HTTPClient protocol to send a CONNECT message for proxies and read the response.
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Args:
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host: The hostname to send in the CONNECT message
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port: The port to send in the CONNECT message
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proxy_creds: credentials to authenticate at proxy
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"""
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def __init__(
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self,
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host: bytes,
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port: int,
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proxy_creds: Optional[ProxyCredentials],
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):
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self.host = host
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self.port = port
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self.proxy_creds = proxy_creds
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self.on_connected: "defer.Deferred[None]" = defer.Deferred()
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def connectionMade(self) -> None:
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logger.debug("Connected to proxy, sending CONNECT")
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self.sendCommand(b"CONNECT", b"%s:%d" % (self.host, self.port))
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# Determine whether we need to set Proxy-Authorization headers
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if self.proxy_creds:
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# Set a Proxy-Authorization header
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self.sendHeader(
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b"Proxy-Authorization",
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self.proxy_creds.as_proxy_authorization_value(),
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)
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self.endHeaders()
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def handleStatus(self, version: bytes, status: bytes, message: bytes) -> None:
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logger.debug("Got Status: %s %s %s", status, message, version)
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if status != b"200":
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raise ProxyConnectError(f"Unexpected status on CONNECT: {status!s}")
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def handleEndHeaders(self) -> None:
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logger.debug("End Headers")
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self.on_connected.callback(None)
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def handleResponse(self, body: bytes) -> None:
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pass
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