diff options
Diffstat (limited to 'libmproxy/protocol2')
| -rw-r--r-- | libmproxy/protocol2/__init__.py | 13 | ||||
| -rw-r--r-- | libmproxy/protocol2/http.py | 588 | ||||
| -rw-r--r-- | libmproxy/protocol2/http_proxy.py | 26 | ||||
| -rw-r--r-- | libmproxy/protocol2/http_replay.py | 95 | ||||
| -rw-r--r-- | libmproxy/protocol2/layer.py | 138 | ||||
| -rw-r--r-- | libmproxy/protocol2/rawtcp.py | 66 | ||||
| -rw-r--r-- | libmproxy/protocol2/reverse_proxy.py | 17 | ||||
| -rw-r--r-- | libmproxy/protocol2/root_context.py | 95 | ||||
| -rw-r--r-- | libmproxy/protocol2/socks_proxy.py | 59 | ||||
| -rw-r--r-- | libmproxy/protocol2/tls.py | 288 | ||||
| -rw-r--r-- | libmproxy/protocol2/transparent_proxy.py | 24 |
11 files changed, 0 insertions, 1409 deletions
diff --git a/libmproxy/protocol2/__init__.py b/libmproxy/protocol2/__init__.py deleted file mode 100644 index 61b9a77e..00000000 --- a/libmproxy/protocol2/__init__.py +++ /dev/null @@ -1,13 +0,0 @@ -from __future__ import (absolute_import, print_function, division) -from .root_context import RootContext -from .socks_proxy import Socks5Proxy -from .reverse_proxy import ReverseProxy -from .http_proxy import HttpProxy, HttpUpstreamProxy -from .transparent_proxy import TransparentProxy -from .http import make_error_response - -__all__ = [ - "RootContext", - "Socks5Proxy", "ReverseProxy", "HttpProxy", "HttpUpstreamProxy", "TransparentProxy", - "make_error_response" -] diff --git a/libmproxy/protocol2/http.py b/libmproxy/protocol2/http.py deleted file mode 100644 index a508ae8b..00000000 --- a/libmproxy/protocol2/http.py +++ /dev/null @@ -1,588 +0,0 @@ -from __future__ import (absolute_import, print_function, division) - -from netlib import tcp -from netlib.http import status_codes, http1, HttpErrorConnClosed, HttpError -from netlib.http.semantics import CONTENT_MISSING -from netlib import odict -from netlib.tcp import NetLibError, Address -from netlib.http.http1 import HTTP1Protocol -from netlib.http.http2 import HTTP2Protocol - -from .. import version, utils -from ..exceptions import InvalidCredentials, HttpException, ProtocolException -from .layer import Layer -from ..proxy import Kill -from libmproxy.protocol import KILL, Error -from libmproxy.protocol.http import HTTPFlow -from libmproxy.protocol.http_wrappers import HTTPResponse, HTTPRequest - - -class _HttpLayer(Layer): - supports_streaming = False - - def read_request(self): - raise NotImplementedError() - - def send_request(self, request): - raise NotImplementedError() - - def read_response(self, request_method): - raise NotImplementedError() - - def send_response(self, response): - raise NotImplementedError() - - -class _StreamingHttpLayer(_HttpLayer): - supports_streaming = True - - def read_response_headers(self): - raise NotImplementedError - - def read_response_body(self, headers, request_method, response_code, max_chunk_size=None): - raise NotImplementedError() - yield "this is a generator" - - def send_response_headers(self, response): - raise NotImplementedError - - def send_response_body(self, response, chunks): - raise NotImplementedError() - - -class Http1Layer(_StreamingHttpLayer): - def __init__(self, ctx, mode): - super(Http1Layer, self).__init__(ctx) - self.mode = mode - self.client_protocol = HTTP1Protocol(self.client_conn) - self.server_protocol = HTTP1Protocol(self.server_conn) - - def read_request(self): - return HTTPRequest.from_protocol( - self.client_protocol, - body_size_limit=self.config.body_size_limit - ) - - def send_request(self, request): - self.server_conn.send(self.server_protocol.assemble(request)) - - def read_response(self, request_method): - return HTTPResponse.from_protocol( - self.server_protocol, - request_method=request_method, - body_size_limit=self.config.body_size_limit, - include_body=True - ) - - def send_response(self, response): - self.client_conn.send(self.client_protocol.assemble(response)) - - def read_response_headers(self): - return HTTPResponse.from_protocol( - self.server_protocol, - request_method=None, # does not matter if we don't read the body. - body_size_limit=self.config.body_size_limit, - include_body=False - ) - - def read_response_body(self, headers, request_method, response_code, max_chunk_size=None): - return self.server_protocol.read_http_body_chunked( - headers, - self.config.body_size_limit, - request_method, - response_code, - False, - max_chunk_size - ) - - def send_response_headers(self, response): - h = self.client_protocol._assemble_response_first_line(response) - self.client_conn.wfile.write(h + "\r\n") - h = self.client_protocol._assemble_response_headers( - response, - preserve_transfer_encoding=True - ) - self.client_conn.send(h + "\r\n") - - def send_response_body(self, response, chunks): - if self.client_protocol.has_chunked_encoding(response.headers): - chunks = ( - "%d\r\n%s\r\n" % (len(chunk), chunk) - for chunk in chunks - ) - for chunk in chunks: - self.client_conn.send(chunk) - - def connect(self): - self.ctx.connect() - self.server_protocol = HTTP1Protocol(self.server_conn) - - def reconnect(self): - self.ctx.reconnect() - self.server_protocol = HTTP1Protocol(self.server_conn) - - def set_server(self, *args, **kwargs): - self.ctx.set_server(*args, **kwargs) - self.server_protocol = HTTP1Protocol(self.server_conn) - - def __call__(self): - layer = HttpLayer(self, self.mode) - layer() - - -# TODO: The HTTP2 layer is missing multiplexing, which requires a major rewrite. -class Http2Layer(_HttpLayer): - def __init__(self, ctx, mode): - super(Http2Layer, self).__init__(ctx) - self.mode = mode - self.client_protocol = HTTP2Protocol(self.client_conn, is_server=True, - unhandled_frame_cb=self.handle_unexpected_frame) - self.server_protocol = HTTP2Protocol(self.server_conn, is_server=False, - unhandled_frame_cb=self.handle_unexpected_frame) - - def read_request(self): - request = HTTPRequest.from_protocol( - self.client_protocol, - body_size_limit=self.config.body_size_limit - ) - self._stream_id = request.stream_id - return request - - def send_request(self, message): - # TODO: implement flow control and WINDOW_UPDATE frames - self.server_conn.send(self.server_protocol.assemble(message)) - - def read_response(self, request_method): - return HTTPResponse.from_protocol( - self.server_protocol, - request_method=request_method, - body_size_limit=self.config.body_size_limit, - include_body=True, - stream_id=self._stream_id - ) - - def send_response(self, message): - # TODO: implement flow control and WINDOW_UPDATE frames - self.client_conn.send(self.client_protocol.assemble(message)) - - def connect(self): - self.ctx.connect() - self.server_protocol = HTTP2Protocol(self.server_conn, is_server=False, - unhandled_frame_cb=self.handle_unexpected_frame) - self.server_protocol.perform_connection_preface() - - def reconnect(self): - self.ctx.reconnect() - self.server_protocol = HTTP2Protocol(self.server_conn, is_server=False, - unhandled_frame_cb=self.handle_unexpected_frame) - self.server_protocol.perform_connection_preface() - - def set_server(self, *args, **kwargs): - self.ctx.set_server(*args, **kwargs) - self.server_protocol = HTTP2Protocol(self.server_conn, is_server=False, - unhandled_frame_cb=self.handle_unexpected_frame) - self.server_protocol.perform_connection_preface() - - def __call__(self): - self.server_protocol.perform_connection_preface() - layer = HttpLayer(self, self.mode) - layer() - - def handle_unexpected_frame(self, frm): - self.log("Unexpected HTTP2 Frame: %s" % frm.human_readable(), "info") - - -def make_error_response(status_code, message, headers=None): - response = status_codes.RESPONSES.get(status_code, "Unknown") - body = """ - <html> - <head> - <title>%d %s</title> - </head> - <body>%s</body> - </html> - """.strip() % (status_code, response, message) - - if not headers: - headers = odict.ODictCaseless() - headers["Server"] = [version.NAMEVERSION] - headers["Connection"] = ["close"] - headers["Content-Length"] = [len(body)] - headers["Content-Type"] = ["text/html"] - - return HTTPResponse( - (1, 1), # FIXME: Should be a string. - status_code, - response, - headers, - body, - ) - - -def make_connect_request(address): - address = Address.wrap(address) - return HTTPRequest( - "authority", "CONNECT", None, address.host, address.port, None, (1, 1), - odict.ODictCaseless(), "" - ) - - -def make_connect_response(httpversion): - headers = odict.ODictCaseless([ - ["Content-Length", "0"], - ["Proxy-Agent", version.NAMEVERSION] - ]) - return HTTPResponse( - httpversion, - 200, - "Connection established", - headers, - "", - ) - - -class ConnectServerConnection(object): - """ - "Fake" ServerConnection to represent state after a CONNECT request to an upstream proxy. - """ - - def __init__(self, address, ctx): - self.address = tcp.Address.wrap(address) - self._ctx = ctx - - @property - def via(self): - return self._ctx.server_conn - - def __getattr__(self, item): - return getattr(self.via, item) - - -class UpstreamConnectLayer(Layer): - def __init__(self, ctx, connect_request): - super(UpstreamConnectLayer, self).__init__(ctx) - self.connect_request = connect_request - self.server_conn = ConnectServerConnection( - (connect_request.host, connect_request.port), - self.ctx - ) - - def __call__(self): - layer = self.ctx.next_layer(self) - layer() - - def connect(self): - if not self.server_conn: - self.ctx.connect() - self.send_request(self.connect_request) - else: - pass # swallow the message - - def reconnect(self): - self.ctx.reconnect() - self.send_request(self.connect_request) - resp = self.read_response("CONNECT") - if resp.code != 200: - raise ProtocolException("Reconnect: Upstream server refuses CONNECT request") - - def set_server(self, address, server_tls=None, sni=None, depth=1): - if depth == 1: - if self.ctx.server_conn: - self.ctx.reconnect() - address = Address.wrap(address) - self.connect_request.host = address.host - self.connect_request.port = address.port - self.server_conn.address = address - else: - self.ctx.set_server(address, server_tls, sni, depth - 1) - - -class HttpLayer(Layer): - def __init__(self, ctx, mode): - super(HttpLayer, self).__init__(ctx) - self.mode = mode - self.__original_server_conn = None - "Contains the original destination in transparent mode, which needs to be restored" - "if an inline script modified the target server for a single http request" - - def __call__(self): - if self.mode == "transparent": - self.__original_server_conn = self.server_conn - while True: - try: - flow = HTTPFlow(self.client_conn, self.server_conn, live=self) - - try: - request = self.read_request() - except tcp.NetLibError: - # don't throw an error for disconnects that happen - # before/between requests. - return - - self.log("request", "debug", [repr(request)]) - - # Handle Proxy Authentication - self.authenticate(request) - - # Regular Proxy Mode: Handle CONNECT - if self.mode == "regular" and request.form_in == "authority": - self.handle_regular_mode_connect(request) - return - - # Make sure that the incoming request matches our expectations - self.validate_request(request) - - flow.request = request - self.process_request_hook(flow) - - if not flow.response: - self.establish_server_connection(flow) - self.get_response_from_server(flow) - - self.send_response_to_client(flow) - - if self.check_close_connection(flow): - return - - # TODO: Implement HTTP Upgrade - - # Upstream Proxy Mode: Handle CONNECT - if flow.request.form_in == "authority" and flow.response.code == 200: - self.handle_upstream_mode_connect(flow.request.copy()) - return - - except (HttpErrorConnClosed, NetLibError, HttpError, ProtocolException) as e: - if flow.request and not flow.response: - flow.error = Error(repr(e)) - self.channel.ask("error", flow) - try: - self.send_response(make_error_response( - getattr(e, "code", 502), - repr(e) - )) - except NetLibError: - pass - if isinstance(e, ProtocolException): - raise e - else: - raise ProtocolException("Error in HTTP connection: %s" % repr(e), e) - finally: - flow.live = False - - def handle_regular_mode_connect(self, request): - self.set_server((request.host, request.port)) - self.send_response(make_connect_response(request.httpversion)) - layer = self.ctx.next_layer(self) - layer() - - def handle_upstream_mode_connect(self, connect_request): - layer = UpstreamConnectLayer(self, connect_request) - layer() - - def check_close_connection(self, flow): - """ - Checks if the connection should be closed depending on the HTTP - semantics. Returns True, if so. - """ - - # TODO: add logic for HTTP/2 - - close_connection = ( - http1.HTTP1Protocol.connection_close( - flow.request.httpversion, - flow.request.headers - ) or http1.HTTP1Protocol.connection_close( - flow.response.httpversion, - flow.response.headers - ) or http1.HTTP1Protocol.expected_http_body_size( - flow.response.headers, - False, - flow.request.method, - flow.response.code) == -1 - ) - if flow.request.form_in == "authority" and flow.response.code == 200: - # Workaround for - # https://github.com/mitmproxy/mitmproxy/issues/313: Some - # proxies (e.g. Charles) send a CONNECT response with HTTP/1.0 - # and no Content-Length header - - return False - return close_connection - - def send_response_to_client(self, flow): - if not (self.supports_streaming and flow.response.stream): - # no streaming: - # we already received the full response from the server and can - # send it to the client straight away. - self.send_response(flow.response) - else: - # streaming: - # First send the headers and then transfer the response incrementally - self.send_response_headers(flow.response) - chunks = self.read_response_body( - flow.response.headers, - flow.request.method, - flow.response.code, - max_chunk_size=4096 - ) - if callable(flow.response.stream): - chunks = flow.response.stream(chunks) - self.send_response_body(flow.response, chunks) - flow.response.timestamp_end = utils.timestamp() - - def get_response_from_server(self, flow): - def get_response(): - self.send_request(flow.request) - if self.supports_streaming: - flow.response = self.read_response_headers() - else: - flow.response = self.read_response() - - try: - get_response() - except (tcp.NetLibError, HttpErrorConnClosed) as v: - self.log( - "server communication error: %s" % repr(v), - level="debug" - ) - # In any case, we try to reconnect at least once. This is - # necessary because it might be possible that we already - # initiated an upstream connection after clientconnect that - # has already been expired, e.g consider the following event - # log: - # > clientconnect (transparent mode destination known) - # > serverconnect (required for client tls handshake) - # > read n% of large request - # > server detects timeout, disconnects - # > read (100-n)% of large request - # > send large request upstream - self.reconnect() - get_response() - - # call the appropriate script hook - this is an opportunity for an - # inline script to set flow.stream = True - flow = self.channel.ask("responseheaders", flow) - if flow is None or flow == KILL: - raise Kill() - - if self.supports_streaming: - if flow.response.stream: - flow.response.content = CONTENT_MISSING - else: - flow.response.content = "".join(self.read_response_body( - flow.response.headers, - flow.request.method, - flow.response.code - )) - flow.response.timestamp_end = utils.timestamp() - - # no further manipulation of self.server_conn beyond this point - # we can safely set it as the final attribute value here. - flow.server_conn = self.server_conn - - self.log( - "response", - "debug", - [repr(flow.response)] - ) - response_reply = self.channel.ask("response", flow) - if response_reply is None or response_reply == KILL: - raise Kill() - - def process_request_hook(self, flow): - # Determine .scheme, .host and .port attributes for inline scripts. - # For absolute-form requests, they are directly given in the request. - # For authority-form requests, we only need to determine the request scheme. - # For relative-form requests, we need to determine host and port as - # well. - if self.mode == "regular": - pass # only absolute-form at this point, nothing to do here. - elif self.mode == "upstream": - if flow.request.form_in == "authority": - flow.request.scheme = "http" # pseudo value - else: - flow.request.host = self.__original_server_conn.address.host - flow.request.port = self.__original_server_conn.address.port - flow.request.scheme = "https" if self.__original_server_conn.tls_established else "http" - - request_reply = self.channel.ask("request", flow) - if request_reply is None or request_reply == KILL: - raise Kill() - if isinstance(request_reply, HTTPResponse): - flow.response = request_reply - return - - def establish_server_connection(self, flow): - address = tcp.Address((flow.request.host, flow.request.port)) - tls = (flow.request.scheme == "https") - - if self.mode == "regular" or self.mode == "transparent": - # If there's an existing connection that doesn't match our expectations, kill it. - if address != self.server_conn.address or tls != self.server_conn.ssl_established: - self.set_server(address, tls, address.host) - # Establish connection is neccessary. - if not self.server_conn: - self.connect() - - # SetServer is not guaranteed to work with TLS: - # If there's not TlsLayer below which could catch the exception, - # TLS will not be established. - if tls and not self.server_conn.tls_established: - raise ProtocolException( - "Cannot upgrade to SSL, no TLS layer on the protocol stack.") - else: - if not self.server_conn: - self.connect() - if tls: - raise HttpException("Cannot change scheme in upstream proxy mode.") - """ - # This is a very ugly (untested) workaround to solve a very ugly problem. - if self.server_conn and self.server_conn.tls_established and not ssl: - self.reconnect() - elif ssl and not hasattr(self, "connected_to") or self.connected_to != address: - if self.server_conn.tls_established: - self.reconnect() - - self.send_request(make_connect_request(address)) - tls_layer = TlsLayer(self, False, True) - tls_layer._establish_tls_with_server() - """ - - def validate_request(self, request): - if request.form_in == "absolute" and request.scheme != "http": - self.send_response( - make_error_response(400, "Invalid request scheme: %s" % request.scheme)) - raise HttpException("Invalid request scheme: %s" % request.scheme) - - expected_request_forms = { - "regular": ("absolute",), # an authority request would already be handled. - "upstream": ("authority", "absolute"), - "transparent": ("relative",) - } - - allowed_request_forms = expected_request_forms[self.mode] - if request.form_in not in allowed_request_forms: - err_message = "Invalid HTTP request form (expected: %s, got: %s)" % ( - " or ".join(allowed_request_forms), request.form_in - ) - self.send_response(make_error_response(400, err_message)) - raise HttpException(err_message) - - if self.mode == "regular": - request.form_out = "relative" - - def authenticate(self, request): - if self.config.authenticator: - if self.config.authenticator.authenticate(request.headers): - self.config.authenticator.clean(request.headers) - else: - self.send_response(make_error_response( - 407, - "Proxy Authentication Required", - odict.ODictCaseless( - [ - [k, v] for k, v in - self.config.authenticator.auth_challenge_headers().items() - ]) - )) - raise InvalidCredentials("Proxy Authentication Required") diff --git a/libmproxy/protocol2/http_proxy.py b/libmproxy/protocol2/http_proxy.py deleted file mode 100644 index 2876c022..00000000 --- a/libmproxy/protocol2/http_proxy.py +++ /dev/null @@ -1,26 +0,0 @@ -from __future__ import (absolute_import, print_function, division) - -from .layer import Layer, ServerConnectionMixin - - -class HttpProxy(Layer, ServerConnectionMixin): - def __call__(self): - layer = self.ctx.next_layer(self) - try: - layer() - finally: - if self.server_conn: - self._disconnect() - - -class HttpUpstreamProxy(Layer, ServerConnectionMixin): - def __init__(self, ctx, server_address): - super(HttpUpstreamProxy, self).__init__(ctx, server_address=server_address) - - def __call__(self): - layer = self.ctx.next_layer(self) - try: - layer() - finally: - if self.server_conn: - self._disconnect() diff --git a/libmproxy/protocol2/http_replay.py b/libmproxy/protocol2/http_replay.py deleted file mode 100644 index 872ef9cd..00000000 --- a/libmproxy/protocol2/http_replay.py +++ /dev/null @@ -1,95 +0,0 @@ -import threading -from netlib.http import HttpError -from netlib.http.http1 import HTTP1Protocol -from netlib.tcp import NetLibError - -from ..controller import Channel -from ..protocol import KILL, Error -from ..protocol.http_wrappers import HTTPResponse -from ..proxy import Log, Kill -from ..proxy.connection import ServerConnection -from .http import make_connect_request - - -class RequestReplayThread(threading.Thread): - name = "RequestReplayThread" - - def __init__(self, config, flow, masterq, should_exit): - """ - masterqueue can be a queue or None, if no scripthooks should be - processed. - """ - self.config, self.flow = config, flow - if masterq: - self.channel = Channel(masterq, should_exit) - else: - self.channel = None - super(RequestReplayThread, self).__init__() - - def run(self): - r = self.flow.request - form_out_backup = r.form_out - try: - self.flow.response = None - - # If we have a channel, run script hooks. - if self.channel: - request_reply = self.channel.ask("request", self.flow) - if request_reply is None or request_reply == KILL: - raise Kill() - elif isinstance(request_reply, HTTPResponse): - self.flow.response = request_reply - - if not self.flow.response: - # In all modes, we directly connect to the server displayed - if self.config.mode == "upstream": - server_address = self.config.upstream_server.address - server = ServerConnection(server_address) - server.connect() - protocol = HTTP1Protocol(server) - if r.scheme == "https": - connect_request = make_connect_request((r.host, r.port)) - server.send(protocol.assemble(connect_request)) - resp = protocol.read_response("CONNECT") - if resp.code != 200: - raise HttpError(502, "Upstream server refuses CONNECT request") - server.establish_ssl( - self.config.clientcerts, - sni=self.flow.server_conn.sni - ) - r.form_out = "relative" - else: - r.form_out = "absolute" - else: - server_address = (r.host, r.port) - server = ServerConnection(server_address) - server.connect() - protocol = HTTP1Protocol(server) - if r.scheme == "https": - server.establish_ssl( - self.config.clientcerts, - sni=self.flow.server_conn.sni - ) - r.form_out = "relative" - - server.send(protocol.assemble(r)) - self.flow.server_conn = server - self.flow.response = HTTPResponse.from_protocol( - protocol, - r.method, - body_size_limit=self.config.body_size_limit, - ) - if self.channel: - response_reply = self.channel.ask("response", self.flow) - if response_reply is None or response_reply == KILL: - raise Kill() - except (HttpError, NetLibError) as v: - self.flow.error = Error(repr(v)) - if self.channel: - self.channel.ask("error", self.flow) - except Kill: - # KillSignal should only be raised if there's a channel in the - # first place. - self.channel.tell("log", Log("Connection killed", "info")) - finally: - r.form_out = form_out_backup diff --git a/libmproxy/protocol2/layer.py b/libmproxy/protocol2/layer.py deleted file mode 100644 index 2b47cc26..00000000 --- a/libmproxy/protocol2/layer.py +++ /dev/null @@ -1,138 +0,0 @@ -""" -mitmproxy protocol architecture - -In mitmproxy, protocols are implemented as a set of layers, which are composed on top each other. -For example, the following scenarios depict possible scenarios (lowest layer first): - -Transparent HTTP proxy, no SSL: - TransparentModeLayer - HttpLayer - -Regular proxy, CONNECT request with WebSockets over SSL: - RegularModeLayer - HttpLayer - SslLayer - WebsocketLayer (or TcpLayer) - -Automated protocol detection by peeking into the buffer: - TransparentModeLayer - SslLayer - Http2Layer - -Communication between layers is done as follows: - - lower layers provide context information to higher layers - - higher layers can call functions provided by lower layers, - which are propagated until they reach a suitable layer. - -Further goals: - - Connections should always be peekable to make automatic protocol detection work. - - Upstream connections should be established as late as possible; - inline scripts shall have a chance to handle everything locally. -""" -from __future__ import (absolute_import, print_function, division) -from netlib import tcp -from ..proxy import Log -from ..proxy.connection import ServerConnection -from ..exceptions import ProtocolException - - -class _LayerCodeCompletion(object): - """ - Dummy class that provides type hinting in PyCharm, which simplifies development a lot. - """ - - def __init__(self, *args, **kwargs): - super(_LayerCodeCompletion, self).__init__(*args, **kwargs) - if True: - return - self.config = None - """@type: libmproxy.proxy.config.ProxyConfig""" - self.client_conn = None - """@type: libmproxy.proxy.connection.ClientConnection""" - self.channel = None - """@type: libmproxy.controller.Channel""" - - -class Layer(_LayerCodeCompletion): - def __init__(self, ctx, *args, **kwargs): - """ - Args: - ctx: The (read-only) higher layer. - """ - super(Layer, self).__init__(*args, **kwargs) - self.ctx = ctx - - def __call__(self): - """ - Logic of the layer. - Raises: - ProtocolException in case of protocol exceptions. - """ - raise NotImplementedError - - def __getattr__(self, name): - """ - Attributes not present on the current layer may exist on a higher layer. - """ - return getattr(self.ctx, name) - - def log(self, msg, level, subs=()): - full_msg = [ - "{}: {}".format(repr(self.client_conn.address), msg) - ] - for i in subs: - full_msg.append(" -> " + i) - full_msg = "\n".join(full_msg) - self.channel.tell("log", Log(full_msg, level)) - - @property - def layers(self): - return [self] + self.ctx.layers - - def __repr__(self): - return type(self).__name__ - - -class ServerConnectionMixin(object): - """ - Mixin that provides a layer with the capabilities to manage a server connection. - """ - - def __init__(self, server_address=None): - super(ServerConnectionMixin, self).__init__() - self.server_conn = ServerConnection(server_address) - - def reconnect(self): - address = self.server_conn.address - self._disconnect() - self.server_conn.address = address - self.connect() - - def set_server(self, address, server_tls=None, sni=None, depth=1): - if depth == 1: - if self.server_conn: - self._disconnect() - self.log("Set new server address: " + repr(address), "debug") - self.server_conn.address = address - else: - self.ctx.set_server(address, server_tls, sni, depth - 1) - - def _disconnect(self): - """ - Deletes (and closes) an existing server connection. - """ - self.log("serverdisconnect", "debug", [repr(self.server_conn.address)]) - self.server_conn.finish() - self.server_conn.close() - # self.channel.tell("serverdisconnect", self) - self.server_conn = ServerConnection(None) - - def connect(self): - if not self.server_conn.address: - raise ProtocolException("Cannot connect to server, no server address given.") - self.log("serverconnect", "debug", [repr(self.server_conn.address)]) - try: - self.server_conn.connect() - except tcp.NetLibError as e: - raise ProtocolException( - "Server connection to '%s' failed: %s" % (self.server_conn.address, e), e) diff --git a/libmproxy/protocol2/rawtcp.py b/libmproxy/protocol2/rawtcp.py deleted file mode 100644 index b10217f1..00000000 --- a/libmproxy/protocol2/rawtcp.py +++ /dev/null @@ -1,66 +0,0 @@ -from __future__ import (absolute_import, print_function, division) -import socket -import select - -from OpenSSL import SSL - -from netlib.tcp import NetLibError -from netlib.utils import cleanBin -from ..exceptions import ProtocolException -from .layer import Layer - - -class RawTcpLayer(Layer): - chunk_size = 4096 - - def __init__(self, ctx, logging=True): - self.logging = logging - super(RawTcpLayer, self).__init__(ctx) - - def __call__(self): - self.connect() - - buf = memoryview(bytearray(self.chunk_size)) - - client = self.client_conn.connection - server = self.server_conn.connection - conns = [client, server] - - try: - while True: - r, _, _ = select.select(conns, [], [], 10) - for conn in r: - dst = server if conn == client else client - - size = conn.recv_into(buf, self.chunk_size) - if not size: - conns.remove(conn) - # Shutdown connection to the other peer - if isinstance(conn, SSL.Connection): - # We can't half-close a connection, so we just close everything here. - # Sockets will be cleaned up on a higher level. - return - else: - dst.shutdown(socket.SHUT_WR) - - if len(conns) == 0: - return - continue - - dst.sendall(buf[:size]) - - if self.logging: - # log messages are prepended with the client address, - # hence the "weird" direction string. - if dst == server: - direction = "-> tcp -> {}".format(repr(self.server_conn.address)) - else: - direction = "<- tcp <- {}".format(repr(self.server_conn.address)) - data = cleanBin(buf[:size].tobytes()) - self.log( - "{}\r\n{}".format(direction, data), - "info" - ) - - except (socket.error, NetLibError, SSL.Error) as e: - raise ProtocolException("TCP connection closed unexpectedly: {}".format(repr(e)), e) diff --git a/libmproxy/protocol2/reverse_proxy.py b/libmproxy/protocol2/reverse_proxy.py deleted file mode 100644 index 3ca998d5..00000000 --- a/libmproxy/protocol2/reverse_proxy.py +++ /dev/null @@ -1,17 +0,0 @@ -from __future__ import (absolute_import, print_function, division) - -from .layer import Layer, ServerConnectionMixin - - -class ReverseProxy(Layer, ServerConnectionMixin): - def __init__(self, ctx, server_address, server_tls): - super(ReverseProxy, self).__init__(ctx, server_address=server_address) - self.server_tls = server_tls - - def __call__(self): - layer = self.ctx.next_layer(self) - try: - layer() - finally: - if self.server_conn: - self._disconnect() diff --git a/libmproxy/protocol2/root_context.py b/libmproxy/protocol2/root_context.py deleted file mode 100644 index daea54bd..00000000 --- a/libmproxy/protocol2/root_context.py +++ /dev/null @@ -1,95 +0,0 @@ -from __future__ import (absolute_import, print_function, division) - -from netlib.http.http1 import HTTP1Protocol -from netlib.http.http2 import HTTP2Protocol - -from .rawtcp import RawTcpLayer -from .tls import TlsLayer, is_tls_record_magic -from .http import Http1Layer, Http2Layer -from .layer import ServerConnectionMixin -from .http_proxy import HttpProxy, HttpUpstreamProxy -from .reverse_proxy import ReverseProxy - - -class RootContext(object): - """ - The outmost context provided to the root layer. - As a consequence, every layer has .client_conn, .channel, .next_layer() and .config. - """ - - def __init__(self, client_conn, config, channel): - self.client_conn = client_conn # Client Connection - self.channel = channel # provides .ask() method to communicate with FlowMaster - self.config = config # Proxy Configuration - - def next_layer(self, top_layer): - """ - This function determines the next layer in the protocol stack. - - Arguments: - top_layer: the current top layer. - - Returns: - The next layer - """ - - # 1. Check for --ignore. - if self.config.check_ignore(top_layer.server_conn.address): - return RawTcpLayer(top_layer, logging=False) - - d = top_layer.client_conn.rfile.peek(3) - client_tls = is_tls_record_magic(d) - - # 2. Always insert a TLS layer, even if there's neither client nor server tls. - # An inline script may upgrade from http to https, - # in which case we need some form of TLS layer. - if isinstance(top_layer, ReverseProxy): - return TlsLayer(top_layer, client_tls, top_layer.server_tls) - if isinstance(top_layer, ServerConnectionMixin): - return TlsLayer(top_layer, client_tls, client_tls) - - # 3. In Http Proxy mode and Upstream Proxy mode, the next layer is fixed. - if isinstance(top_layer, TlsLayer): - if isinstance(top_layer.ctx, HttpProxy): - return Http1Layer(top_layer, "regular") - if isinstance(top_layer.ctx, HttpUpstreamProxy): - return Http1Layer(top_layer, "upstream") - - # 4. Check for other TLS cases (e.g. after CONNECT). - if client_tls: - return TlsLayer(top_layer, True, True) - - # 4. Check for --tcp - if self.config.check_tcp(top_layer.server_conn.address): - return RawTcpLayer(top_layer) - - # 5. Check for TLS ALPN (HTTP1/HTTP2) - if isinstance(top_layer, TlsLayer): - alpn = top_layer.client_conn.get_alpn_proto_negotiated() - if alpn == HTTP2Protocol.ALPN_PROTO_H2: - return Http2Layer(top_layer, 'transparent') - if alpn == HTTP1Protocol.ALPN_PROTO_HTTP1: - return Http1Layer(top_layer, 'transparent') - - # 6. Assume HTTP1 by default - return Http1Layer(top_layer, 'transparent') - - # In a future version, we want to implement TCP passthrough as the last fallback, - # but we don't have the UI part ready for that. - # - # d = top_layer.client_conn.rfile.peek(3) - # is_ascii = ( - # len(d) == 3 and - # # better be safe here and don't expect uppercase... - # all(x in string.ascii_letters for x in d) - # ) - # # TODO: This could block if there are not enough bytes available? - # d = top_layer.client_conn.rfile.peek(len(HTTP2Protocol.CLIENT_CONNECTION_PREFACE)) - # is_http2_magic = (d == HTTP2Protocol.CLIENT_CONNECTION_PREFACE) - - @property - def layers(self): - return [] - - def __repr__(self): - return "RootContext" diff --git a/libmproxy/protocol2/socks_proxy.py b/libmproxy/protocol2/socks_proxy.py deleted file mode 100644 index 525520e8..00000000 --- a/libmproxy/protocol2/socks_proxy.py +++ /dev/null @@ -1,59 +0,0 @@ -from __future__ import (absolute_import, print_function, division) - -from netlib import socks -from netlib.tcp import NetLibError -from ..exceptions import Socks5Exception -from .layer import Layer, ServerConnectionMixin - - -class Socks5Proxy(Layer, ServerConnectionMixin): - def __call__(self): - try: - # Parse Client Greeting - client_greet = socks.ClientGreeting.from_file(self.client_conn.rfile, fail_early=True) - client_greet.assert_socks5() - if socks.METHOD.NO_AUTHENTICATION_REQUIRED not in client_greet.methods: - raise socks.SocksError( - socks.METHOD.NO_ACCEPTABLE_METHODS, - "mitmproxy only supports SOCKS without authentication" - ) - - # Send Server Greeting - server_greet = socks.ServerGreeting( - socks.VERSION.SOCKS5, - socks.METHOD.NO_AUTHENTICATION_REQUIRED - ) - server_greet.to_file(self.client_conn.wfile) - self.client_conn.wfile.flush() - - # Parse Connect Request - connect_request = socks.Message.from_file(self.client_conn.rfile) - connect_request.assert_socks5() - if connect_request.msg != socks.CMD.CONNECT: - raise socks.SocksError( - socks.REP.COMMAND_NOT_SUPPORTED, - "mitmproxy only supports SOCKS5 CONNECT." - ) - - # We always connect lazily, but we need to pretend to the client that we connected. - connect_reply = socks.Message( - socks.VERSION.SOCKS5, - socks.REP.SUCCEEDED, - connect_request.atyp, - # dummy value, we don't have an upstream connection yet. - connect_request.addr - ) - connect_reply.to_file(self.client_conn.wfile) - self.client_conn.wfile.flush() - - except (socks.SocksError, NetLibError) as e: - raise Socks5Exception("SOCKS5 mode failure: %s" % repr(e), e) - - self.server_conn.address = connect_request.addr - - layer = self.ctx.next_layer(self) - try: - layer() - finally: - if self.server_conn: - self._disconnect() diff --git a/libmproxy/protocol2/tls.py b/libmproxy/protocol2/tls.py deleted file mode 100644 index 73bb12f3..00000000 --- a/libmproxy/protocol2/tls.py +++ /dev/null @@ -1,288 +0,0 @@ -from __future__ import (absolute_import, print_function, division) - -import struct - -from construct import ConstructError - -from netlib.tcp import NetLibError, NetLibInvalidCertificateError -from netlib.http.http1 import HTTP1Protocol -from ..contrib.tls._constructs import ClientHello -from ..exceptions import ProtocolException -from .layer import Layer - - -def is_tls_record_magic(d): - """ - Returns: - True, if the passed bytes start with the TLS record magic bytes. - False, otherwise. - """ - d = d[:3] - - # TLS ClientHello magic, works for SSLv3, TLSv1.0, TLSv1.1, TLSv1.2 - # http://www.moserware.com/2009/06/first-few-milliseconds-of-https.html#client-hello - return ( - len(d) == 3 and - d[0] == '\x16' and - d[1] == '\x03' and - d[2] in ('\x00', '\x01', '\x02', '\x03') - ) - - -class TlsLayer(Layer): - def __init__(self, ctx, client_tls, server_tls): - self.client_sni = None - self.client_alpn_protocols = None - - super(TlsLayer, self).__init__(ctx) - self._client_tls = client_tls - self._server_tls = server_tls - - self._sni_from_server_change = None - - def __call__(self): - """ - The strategy for establishing SSL is as follows: - First, we determine whether we need the server cert to establish ssl with the client. - If so, we first connect to the server and then to the client. - If not, we only connect to the client and do the server_ssl lazily on a Connect message. - - An additional complexity is that establish ssl with the server may require a SNI value from the client. - In an ideal world, we'd do the following: - 1. Start the SSL handshake with the client - 2. Check if the client sends a SNI. - 3. Pause the client handshake, establish SSL with the server. - 4. Finish the client handshake with the certificate from the server. - There's just one issue: We cannot get a callback from OpenSSL if the client doesn't send a SNI. :( - Thus, we manually peek into the connection and parse the ClientHello message to obtain both SNI and ALPN values. - - Further notes: - - OpenSSL 1.0.2 introduces a callback that would help here: - https://www.openssl.org/docs/ssl/SSL_CTX_set_cert_cb.html - - The original mitmproxy issue is https://github.com/mitmproxy/mitmproxy/issues/427 - """ - - client_tls_requires_server_cert = ( - self._client_tls and self._server_tls and not self.config.no_upstream_cert - ) - - if self._client_tls: - self._parse_client_hello() - - if client_tls_requires_server_cert: - self._establish_tls_with_client_and_server() - elif self._client_tls: - self._establish_tls_with_client() - - layer = self.ctx.next_layer(self) - layer() - - def __repr__(self): - if self._client_tls and self._server_tls: - return "TlsLayer(client and server)" - elif self._client_tls: - return "TlsLayer(client)" - elif self._server_tls: - return "TlsLayer(server)" - else: - return "TlsLayer(inactive)" - - def _get_client_hello(self): - """ - Peek into the socket and read all records that contain the initial client hello message. - - Returns: - The raw handshake packet bytes, without TLS record header(s). - """ - client_hello = "" - client_hello_size = 1 - offset = 0 - while len(client_hello) < client_hello_size: - record_header = self.client_conn.rfile.peek(offset + 5)[offset:] - if not is_tls_record_magic(record_header) or len(record_header) != 5: - raise ProtocolException('Expected TLS record, got "%s" instead.' % record_header) - record_size = struct.unpack("!H", record_header[3:])[0] + 5 - record_body = self.client_conn.rfile.peek(offset + record_size)[offset + 5:] - if len(record_body) != record_size - 5: - raise ProtocolException("Unexpected EOF in TLS handshake: %s" % record_body) - client_hello += record_body - offset += record_size - client_hello_size = struct.unpack("!I", '\x00' + client_hello[1:4])[0] + 4 - return client_hello - - def _parse_client_hello(self): - """ - Peek into the connection, read the initial client hello and parse it to obtain ALPN values. - """ - try: - raw_client_hello = self._get_client_hello()[4:] # exclude handshake header. - except ProtocolException as e: - self.log("Cannot parse Client Hello: %s" % repr(e), "error") - return - - try: - client_hello = ClientHello.parse(raw_client_hello) - except ConstructError as e: - self.log("Cannot parse Client Hello: %s" % repr(e), "error") - self.log("Raw Client Hello:\r\n:%s" % raw_client_hello.encode("hex"), "debug") - return - - for extension in client_hello.extensions: - if extension.type == 0x00: - if len(extension.server_names) != 1 or extension.server_names[0].type != 0: - self.log("Unknown Server Name Indication: %s" % extension.server_names, "error") - self.client_sni = extension.server_names[0].name - elif extension.type == 0x10: - self.client_alpn_protocols = list(extension.alpn_protocols) - - self.log( - "Parsed Client Hello: sni=%s, alpn=%s" % (self.client_sni, self.client_alpn_protocols), - "debug" - ) - - def connect(self): - if not self.server_conn: - self.ctx.connect() - if self._server_tls and not self.server_conn.tls_established: - self._establish_tls_with_server() - - def reconnect(self): - self.ctx.reconnect() - if self._server_tls and not self.server_conn.tls_established: - self._establish_tls_with_server() - - def set_server(self, address, server_tls=None, sni=None, depth=1): - self.ctx.set_server(address, server_tls, sni, depth) - if depth == 1 and server_tls is not None: - self._sni_from_server_change = sni - self._server_tls = server_tls - - @property - def sni_for_server_connection(self): - if self._sni_from_server_change is False: - return None - else: - return self._sni_from_server_change or self.client_sni - - @property - def alpn_for_client_connection(self): - return self.server_conn.get_alpn_proto_negotiated() - - def __alpn_select_callback(self, conn_, options): - """ - Once the client signals the alternate protocols it supports, - we reconnect upstream with the same list and pass the server's choice down to the client. - """ - - # This gets triggered if we haven't established an upstream connection yet. - default_alpn = HTTP1Protocol.ALPN_PROTO_HTTP1 - # alpn_preference = netlib.http.http2.HTTP2Protocol.ALPN_PROTO_H2 - - if self.alpn_for_client_connection in options: - choice = bytes(self.alpn_for_client_connection) - elif default_alpn in options: - choice = bytes(default_alpn) - else: - choice = options[0] - self.log("ALPN for client: %s" % choice, "debug") - return choice - - def _establish_tls_with_client_and_server(self): - self.ctx.connect() - - # If establishing TLS with the server fails, we try to establish TLS with the client nonetheless - # to send an error message over TLS. - try: - self._establish_tls_with_server() - except Exception as e: - try: - self._establish_tls_with_client() - except: - pass - raise e - - self._establish_tls_with_client() - - def _establish_tls_with_client(self): - self.log("Establish TLS with client", "debug") - cert, key, chain_file = self._find_cert() - - try: - self.client_conn.convert_to_ssl( - cert, key, - method=self.config.openssl_method_client, - options=self.config.openssl_options_client, - cipher_list=self.config.ciphers_client, - dhparams=self.config.certstore.dhparams, - chain_file=chain_file, - alpn_select_callback=self.__alpn_select_callback, - ) - except NetLibError as e: - raise ProtocolException("Cannot establish TLS with client: %s" % repr(e), e) - - def _establish_tls_with_server(self): - self.log("Establish TLS with server", "debug") - try: - # We only support http/1.1 and h2. - # If the server only supports spdy (next to http/1.1), it may select that - # and mitmproxy would enter TCP passthrough mode, which we want to avoid. - deprecated_http2_variant = lambda x: x.startswith("h2-") or x.startswith("spdy") - if self.client_alpn_protocols: - alpn = filter(lambda x: not deprecated_http2_variant(x), self.client_alpn_protocols) - else: - alpn = None - - self.server_conn.establish_ssl( - self.config.clientcerts, - self.sni_for_server_connection, - method=self.config.openssl_method_server, - options=self.config.openssl_options_server, - verify_options=self.config.openssl_verification_mode_server, - ca_path=self.config.openssl_trusted_cadir_server, - ca_pemfile=self.config.openssl_trusted_ca_server, - cipher_list=self.config.ciphers_server, - alpn_protos=alpn, - ) - tls_cert_err = self.server_conn.ssl_verification_error - if tls_cert_err is not None: - self.log( - "TLS verification failed for upstream server at depth %s with error: %s" % - (tls_cert_err['depth'], tls_cert_err['errno']), - "error") - self.log("Ignoring server verification error, continuing with connection", "error") - except NetLibInvalidCertificateError as e: - tls_cert_err = self.server_conn.ssl_verification_error - self.log( - "TLS verification failed for upstream server at depth %s with error: %s" % - (tls_cert_err['depth'], tls_cert_err['errno']), - "error") - self.log("Aborting connection attempt", "error") - raise ProtocolException("Cannot establish TLS with server: %s" % repr(e), e) - except NetLibError as e: - raise ProtocolException("Cannot establish TLS with server: %s" % repr(e), e) - - self.log("ALPN selected by server: %s" % self.alpn_for_client_connection, "debug") - - def _find_cert(self): - host = self.server_conn.address.host - sans = set() - # Incorporate upstream certificate - use_upstream_cert = ( - self.server_conn and - self.server_conn.tls_established and - (not self.config.no_upstream_cert) - ) - if use_upstream_cert: - upstream_cert = self.server_conn.cert - sans.update(upstream_cert.altnames) - if upstream_cert.cn: - sans.add(host) - host = upstream_cert.cn.decode("utf8").encode("idna") - # Also add SNI values. - if self.client_sni: - sans.add(self.client_sni) - if self._sni_from_server_change: - sans.add(self._sni_from_server_change) - - sans.discard(host) - return self.config.certstore.get_cert(host, list(sans)) diff --git a/libmproxy/protocol2/transparent_proxy.py b/libmproxy/protocol2/transparent_proxy.py deleted file mode 100644 index e6ebf115..00000000 --- a/libmproxy/protocol2/transparent_proxy.py +++ /dev/null @@ -1,24 +0,0 @@ -from __future__ import (absolute_import, print_function, division) - -from ..exceptions import ProtocolException -from .. import platform -from .layer import Layer, ServerConnectionMixin - - -class TransparentProxy(Layer, ServerConnectionMixin): - def __init__(self, ctx): - super(TransparentProxy, self).__init__(ctx) - self.resolver = platform.resolver() - - def __call__(self): - try: - self.server_conn.address = self.resolver.original_addr(self.client_conn.connection) - except Exception as e: - raise ProtocolException("Transparent mode failure: %s" % repr(e), e) - - layer = self.ctx.next_layer(self) - try: - layer() - finally: - if self.server_conn: - self._disconnect() |