--- mitmproxy/proxy/protocol/websocket.py.orig 2019-02-14 21:03:58 UTC +++ mitmproxy/proxy/protocol/websocket.py @@ -4,8 +4,9 @@ from OpenSSL import SSL import wsproto -from wsproto import events -from wsproto.connection import ConnectionType, WSConnection +from wsproto import events, WSConnection +from wsproto.connection import ConnectionType +from wsproto.events import AcceptConnection, CloseConnection, Message, Ping, Request from wsproto.extensions import PerMessageDeflate from mitmproxy import exceptions @@ -52,51 +53,52 @@ class WebSocketLayer(base.Layer): self.connections: dict[object, WSConnection] = {} - extensions = [] + client_extensions = [] + server_extensions = [] if 'Sec-WebSocket-Extensions' in handshake_flow.response.headers: if PerMessageDeflate.name in handshake_flow.response.headers['Sec-WebSocket-Extensions']: - extensions = [PerMessageDeflate()] - self.connections[self.client_conn] = WSConnection(ConnectionType.SERVER, - extensions=extensions) - self.connections[self.server_conn] = WSConnection(ConnectionType.CLIENT, - host=handshake_flow.request.host, - resource=handshake_flow.request.path, - extensions=extensions) - if extensions: - for conn in self.connections.values(): - conn.extensions[0].finalize(conn, handshake_flow.response.headers['Sec-WebSocket-Extensions']) + client_extensions = [PerMessageDeflate()] + server_extensions = [PerMessageDeflate()] + self.connections[self.client_conn] = WSConnection(ConnectionType.SERVER) + self.connections[self.server_conn] = WSConnection(ConnectionType.CLIENT) - data = self.connections[self.server_conn].bytes_to_send() - self.connections[self.client_conn].receive_bytes(data) + if client_extensions: + client_extensions[0].finalize(handshake_flow.response.headers['Sec-WebSocket-Extensions']) + if server_extensions: + server_extensions[0].finalize(handshake_flow.response.headers['Sec-WebSocket-Extensions']) + request = Request(extensions=client_extensions, host=handshake_flow.request.host, target=handshake_flow.request.path) + data = self.connections[self.server_conn].send(request) + self.connections[self.client_conn].receive_data(data) + event = next(self.connections[self.client_conn].events()) - assert isinstance(event, events.ConnectionRequested) + assert isinstance(event, events.Request) - self.connections[self.client_conn].accept(event) - self.connections[self.server_conn].receive_bytes(self.connections[self.client_conn].bytes_to_send()) - assert isinstance(next(self.connections[self.server_conn].events()), events.ConnectionEstablished) + data = self.connections[self.client_conn].send(AcceptConnection(extensions=server_extensions)) + self.connections[self.server_conn].receive_data(data) + assert isinstance(next(self.connections[self.server_conn].events()), events.AcceptConnection) def _handle_event(self, event, source_conn, other_conn, is_server): - if isinstance(event, events.DataReceived): - return self._handle_data_received(event, source_conn, other_conn, is_server) - elif isinstance(event, events.PingReceived): - return self._handle_ping_received(event, source_conn, other_conn, is_server) - elif isinstance(event, events.PongReceived): - return self._handle_pong_received(event, source_conn, other_conn, is_server) - elif isinstance(event, events.ConnectionClosed): - return self._handle_connection_closed(event, source_conn, other_conn, is_server) + if isinstance(event, events.Message): + return self._handle_message(event, source_conn, other_conn, is_server) + elif isinstance(event, events.Ping): + return self._handle_ping(event, source_conn, other_conn, is_server) + elif isinstance(event, events.Pong): + return self._handle_pong(event, source_conn, other_conn, is_server) + elif isinstance(event, events.CloseConnection): + return self._handle_close_connection(event, source_conn, other_conn, is_server) # fail-safe for unhandled events return True # pragma: no cover - def _handle_data_received(self, event, source_conn, other_conn, is_server): + def _handle_message(self, event, source_conn, other_conn, is_server): fb = self.server_frame_buffer if is_server else self.client_frame_buffer fb.append(event.data) if event.message_finished: original_chunk_sizes = [len(f) for f in fb] - if isinstance(event, events.TextReceived): + if isinstance(event, events.TextMessage): message_type = wsproto.frame_protocol.Opcode.TEXT payload = ''.join(fb) else: @@ -127,19 +129,20 @@ class WebSocketLayer(base.Layer): yield (payload[i:i + chunk_size], True if i + chunk_size >= len(payload) else False) for chunk, final in get_chunk(websocket_message.content): - self.connections[other_conn].send_data(chunk, final) - other_conn.send(self.connections[other_conn].bytes_to_send()) + data = self.connections[other_conn].send(Message(data=chunk, message_finished=final)) + other_conn.send(data) if self.flow.stream: - self.connections[other_conn].send_data(event.data, event.message_finished) - other_conn.send(self.connections[other_conn].bytes_to_send()) + data = self.connections[other_conn].send(Message(data=event.data, message_finished=event.message_finished)) + other_conn.send(data) return True - def _handle_ping_received(self, event, source_conn, other_conn, is_server): - # PING is automatically answered with a PONG by wsproto - self.connections[other_conn].ping() - other_conn.send(self.connections[other_conn].bytes_to_send()) - source_conn.send(self.connections[source_conn].bytes_to_send()) + def _handle_ping(self, event, source_conn, other_conn, is_server): + # Use event.response to create the approprate Pong response + data = self.connections[other_conn].send(Ping()) + other_conn.send(data) + data = self.connections[source_conn].send(event.response()) + source_conn.send(data) self.log( "Ping Received from {}".format("server" if is_server else "client"), "info", @@ -147,7 +150,7 @@ class WebSocketLayer(base.Layer): ) return True - def _handle_pong_received(self, event, source_conn, other_conn, is_server): + def _handle_pong(self, event, source_conn, other_conn, is_server): self.log( "Pong Received from {}".format("server" if is_server else "client"), "info", @@ -155,14 +158,15 @@ class WebSocketLayer(base.Layer): ) return True - def _handle_connection_closed(self, event, source_conn, other_conn, is_server): + def _handle_close_connection(self, event, source_conn, other_conn, is_server): self.flow.close_sender = "server" if is_server else "client" self.flow.close_code = event.code self.flow.close_reason = event.reason - self.connections[other_conn].close(event.code, event.reason) - other_conn.send(self.connections[other_conn].bytes_to_send()) - source_conn.send(self.connections[source_conn].bytes_to_send()) + data = self.connections[other_conn].send(CloseConnection(code=event.code, reason=event.reason)) + other_conn.send(data) + data = self.connections[source_conn].send(event.response()) + source_conn.send(data) return False @@ -170,8 +174,7 @@ class WebSocketLayer(base.Layer): while True: try: payload = message_queue.get_nowait() - self.connections[endpoint].send_data(payload, final=True) - data = self.connections[endpoint].bytes_to_send() + data = self.connections[endpoint].send(Message(data=payload, message_finished=True)) endpoint.send(data) except queue.Empty: break @@ -197,8 +200,8 @@ class WebSocketLayer(base.Layer): is_server = (source_conn == self.server_conn) frame = websockets.Frame.from_file(source_conn.rfile) - self.connections[source_conn].receive_bytes(bytes(frame)) - source_conn.send(self.connections[source_conn].bytes_to_send()) + data = self.connections[source_conn].receive_data(bytes(frame)) + source_conn.send(data) if close_received: return