diff options
Diffstat (limited to 'libmproxy/protocol/http.py')
| -rw-r--r-- | libmproxy/protocol/http.py | 425 |
1 files changed, 6 insertions, 419 deletions
diff --git a/libmproxy/protocol/http.py b/libmproxy/protocol/http.py index a8626af8..ee9d2d46 100644 --- a/libmproxy/protocol/http.py +++ b/libmproxy/protocol/http.py @@ -3,26 +3,17 @@ from __future__ import (absolute_import, print_function, division) import sys import traceback import six -import struct -import threading -import time -import Queue from netlib import tcp from netlib.exceptions import HttpException, HttpReadDisconnect, NetlibException -from netlib.http import http1, Headers, CONTENT_MISSING -from netlib.tcp import Address, ssl_read_select +from netlib.http import Headers, CONTENT_MISSING -import h2 -from h2.connection import H2Connection -from h2.events import * +from h2.exceptions import H2Error -from .base import Layer, Kill from .. import utils from ..exceptions import HttpProtocolException, ProtocolException from ..models import ( HTTPFlow, - HTTPRequest, HTTPResponse, make_error_response, make_connect_response, @@ -30,8 +21,9 @@ from ..models import ( expect_continue_response ) +from .base import Layer, Kill -class _HttpLayer(Layer): +class _HttpTransmissionLayer(Layer): def read_request(self): raise NotImplementedError() @@ -71,411 +63,6 @@ class _HttpLayer(Layer): raise NotImplementedError() -class Http1Layer(_HttpLayer): - def __init__(self, ctx, mode): - super(Http1Layer, self).__init__(ctx) - self.mode = mode - - def read_request(self): - req = http1.read_request(self.client_conn.rfile, body_size_limit=self.config.body_size_limit) - return HTTPRequest.wrap(req) - - def read_request_body(self, request): - expected_size = http1.expected_http_body_size(request) - return http1.read_body(self.client_conn.rfile, expected_size, self.config.body_size_limit) - - def send_request(self, request): - self.server_conn.wfile.write(http1.assemble_request(request)) - self.server_conn.wfile.flush() - - def read_response_headers(self): - resp = http1.read_response_head(self.server_conn.rfile) - return HTTPResponse.wrap(resp) - - def read_response_body(self, request, response): - expected_size = http1.expected_http_body_size(request, response) - return http1.read_body(self.server_conn.rfile, expected_size, self.config.body_size_limit) - - def send_response_headers(self, response): - raw = http1.assemble_response_head(response) - self.client_conn.wfile.write(raw) - self.client_conn.wfile.flush() - - def send_response_body(self, response, chunks): - for chunk in http1.assemble_body(response.headers, chunks): - self.client_conn.wfile.write(chunk) - self.client_conn.wfile.flush() - - def check_close_connection(self, flow): - request_close = http1.connection_close( - flow.request.http_version, - flow.request.headers - ) - response_close = http1.connection_close( - flow.response.http_version, - flow.response.headers - ) - read_until_eof = http1.expected_http_body_size(flow.request, flow.response) == -1 - close_connection = request_close or response_close or read_until_eof - if flow.request.form_in == "authority" and flow.response.status_code == 200: - # Workaround for https://github.com/mitmproxy/mitmproxy/issues/313: - # Charles Proxy sends a CONNECT response with HTTP/1.0 - # and no Content-Length header - - return False - return close_connection - - def __call__(self): - layer = HttpLayer(self, self.mode) - layer() - - -class SafeH2Connection(H2Connection): - def __init__(self, conn, *args, **kwargs): - super(SafeH2Connection, self).__init__(*args, **kwargs) - self.conn = conn - self.lock = threading.RLock() - - def safe_close_connection(self, error_code): - with self.lock: - self.close_connection(error_code) - self.conn.send(self.data_to_send()) - - def safe_increment_flow_control(self, stream_id, length): - if length == 0: - return - - with self.lock: - self.increment_flow_control_window(length) - self.conn.send(self.data_to_send()) - with self.lock: - if stream_id in self.streams and not self.streams[stream_id].closed: - self.increment_flow_control_window(length, stream_id=stream_id) - self.conn.send(self.data_to_send()) - - def safe_reset_stream(self, stream_id, error_code): - with self.lock: - try: - self.reset_stream(stream_id, error_code) - except h2.exceptions.StreamClosedError: - # stream is already closed - good - pass - self.conn.send(self.data_to_send()) - - def safe_update_settings(self, new_settings): - with self.lock: - self.update_settings(new_settings) - self.conn.send(self.data_to_send()) - - def safe_send_headers(self, is_zombie, stream_id, headers): - with self.lock: - if is_zombie(self, stream_id): - return - self.send_headers(stream_id, headers) - self.conn.send(self.data_to_send()) - - def safe_send_body(self, is_zombie, stream_id, chunks): - for chunk in chunks: - position = 0 - while position < len(chunk): - self.lock.acquire() - if is_zombie(self, stream_id): - return - max_outbound_frame_size = self.max_outbound_frame_size - frame_chunk = chunk[position:position+max_outbound_frame_size] - if self.local_flow_control_window(stream_id) < len(frame_chunk): - self.lock.release() - time.sleep(0) - continue - self.send_data(stream_id, frame_chunk) - self.conn.send(self.data_to_send()) - self.lock.release() - position += max_outbound_frame_size - with self.lock: - if is_zombie(self, stream_id): - return - self.end_stream(stream_id) - self.conn.send(self.data_to_send()) - - -class Http2Layer(Layer): - def __init__(self, ctx, mode): - super(Http2Layer, self).__init__(ctx) - self.mode = mode - self.streams = dict() - self.server_to_client_stream_ids = dict([(0, 0)]) - self.client_conn.h2 = SafeH2Connection(self.client_conn, client_side=False) - - # make sure that we only pass actual SSL.Connection objects in here, - # because otherwise ssl_read_select fails! - self.active_conns = [self.client_conn.connection] - - def _initiate_server_conn(self): - self.server_conn.h2 = SafeH2Connection(self.server_conn, client_side=True) - self.server_conn.h2.initiate_connection() - self.server_conn.send(self.server_conn.h2.data_to_send()) - self.active_conns.append(self.server_conn.connection) - - def connect(self): - self.ctx.connect() - self.server_conn.connect() - self._initiate_server_conn() - - def set_server(self): - raise NotImplementedError("Cannot change server for HTTP2 connections.") - - def disconnect(self): - raise NotImplementedError("Cannot dis- or reconnect in HTTP2 connections.") - - def next_layer(self): - # WebSockets over HTTP/2? - # CONNECT for proxying? - raise NotImplementedError() - - def _handle_event(self, event, source_conn, other_conn, is_server): - if hasattr(event, 'stream_id'): - if is_server and event.stream_id % 2 == 1: - eid = self.server_to_client_stream_ids[event.stream_id] - else: - eid = event.stream_id - - if isinstance(event, RequestReceived): - headers = Headers([[str(k), str(v)] for k, v in event.headers]) - self.streams[eid] = Http2SingleStreamLayer(self, eid, headers) - self.streams[eid].timestamp_start = time.time() - self.streams[eid].start() - elif isinstance(event, ResponseReceived): - headers = Headers([[str(k), str(v)] for k, v in event.headers]) - self.streams[eid].queued_data_length = 0 - self.streams[eid].timestamp_start = time.time() - self.streams[eid].response_headers = headers - self.streams[eid].response_arrived.set() - elif isinstance(event, DataReceived): - if self.config.body_size_limit and self.streams[eid].queued_data_length > self.config.body_size_limit: - raise HttpException("HTTP body too large. Limit is {}.".format(self.config.body_size_limit)) - self.streams[eid].data_queue.put(event.data) - self.streams[eid].queued_data_length += len(event.data) - source_conn.h2.safe_increment_flow_control(event.stream_id, len(event.data)) - elif isinstance(event, StreamEnded): - self.streams[eid].timestamp_end = time.time() - self.streams[eid].data_finished.set() - elif isinstance(event, StreamReset): - self.streams[eid].zombie = time.time() - if eid in self.streams and event.error_code == 0x8: - if is_server: - other_stream_id = self.streams[eid].client_stream_id - else: - other_stream_id = self.streams[eid].server_stream_id - other_conn.h2.safe_reset_stream(other_stream_id, event.error_code) - elif isinstance(event, RemoteSettingsChanged): - new_settings = dict([(id, cs.new_value) for (id, cs) in event.changed_settings.iteritems()]) - other_conn.h2.safe_update_settings(new_settings) - elif isinstance(event, ConnectionTerminated): - other_conn.h2.safe_close_connection(event.error_code) - return False - elif isinstance(event, PushedStreamReceived): - # pushed stream ids should be uniq and not dependent on race conditions - # only the parent stream id must be looked up first - parent_eid = self.server_to_client_stream_ids[event.parent_stream_id] - with self.client_conn.h2.lock: - self.client_conn.h2.push_stream(parent_eid, event.pushed_stream_id, event.headers) - - headers = Headers([[str(k), str(v)] for k, v in event.headers]) - headers['x-mitmproxy-pushed'] = 'true' - self.streams[event.pushed_stream_id] = Http2SingleStreamLayer(self, event.pushed_stream_id, headers) - self.streams[event.pushed_stream_id].timestamp_start = time.time() - self.streams[event.pushed_stream_id].pushed = True - self.streams[event.pushed_stream_id].parent_stream_id = parent_eid - self.streams[event.pushed_stream_id].timestamp_end = time.time() - self.streams[event.pushed_stream_id].data_finished.set() - self.streams[event.pushed_stream_id].start() - elif isinstance(event, TrailersReceived): - raise NotImplementedError() - - return True - - def _cleanup_streams(self): - death_time = time.time() - 10 - for stream_id in self.streams.keys(): - zombie = self.streams[stream_id].zombie - if zombie and zombie <= death_time: - self.streams.pop(stream_id, None) - - def __call__(self): - if self.server_conn: - self._initiate_server_conn() - - preamble = self.client_conn.rfile.read(24) - self.client_conn.h2.initiate_connection() - self.client_conn.h2.receive_data(preamble) - self.client_conn.send(self.client_conn.h2.data_to_send()) - - while True: - r = ssl_read_select(self.active_conns, 1) - for conn in r: - source_conn = self.client_conn if conn == self.client_conn.connection else self.server_conn - other_conn = self.server_conn if conn == self.client_conn.connection else self.client_conn - is_server = (conn == self.server_conn.connection) - - field = source_conn.rfile.peek(3) - length = int(field.encode('hex'), 16) - raw_frame = source_conn.rfile.safe_read(9 + length) - - with source_conn.h2.lock: - events = source_conn.h2.receive_data(raw_frame) - source_conn.send(source_conn.h2.data_to_send()) - - for event in events: - if not self._handle_event(event, source_conn, other_conn, is_server): - return - - self._cleanup_streams() - - -class Http2SingleStreamLayer(_HttpLayer, threading.Thread): - def __init__(self, ctx, stream_id, request_headers): - super(Http2SingleStreamLayer, self).__init__(ctx) - self.zombie = None - self.client_stream_id = stream_id - self.server_stream_id = None - self.request_headers = request_headers - self.response_headers = None - self.data_queue = Queue.Queue() - self.queued_data_length = 0 - - self.response_arrived = threading.Event() - self.data_finished = threading.Event() - - def is_zombie(self, h2_conn, stream_id): - if self.zombie: - return True - return False - - def read_request(self): - self.data_finished.wait() - self.data_finished.clear() - - authority = self.request_headers.get(':authority', '') - method = self.request_headers.get(':method', 'GET') - scheme = self.request_headers.get(':scheme', 'https') - path = self.request_headers.get(':path', '/') - host = None - port = None - - if path == '*' or path.startswith("/"): - form_in = "relative" - elif method == 'CONNECT': - form_in = "authority" - if ":" in authority: - host, port = authority.split(":", 1) - else: - host = authority - else: - form_in = "absolute" - # FIXME: verify if path or :host contains what we need - scheme, host, port, _ = utils.parse_url(path) - - if host is None: - host = 'localhost' - if port is None: - port = 80 if scheme == 'http' else 443 - port = int(port) - - data = [] - while self.data_queue.qsize() > 0: - data.append(self.data_queue.get()) - data = b"".join(data) - - return HTTPRequest( - form_in, - method, - scheme, - host, - port, - path, - (2, 0), - self.request_headers, - data, - timestamp_start=self.timestamp_start, - timestamp_end=self.timestamp_end, - ) - - def send_request(self, message): - with self.server_conn.h2.lock: - self.server_stream_id = self.server_conn.h2.get_next_available_stream_id() - self.server_to_client_stream_ids[self.server_stream_id] = self.client_stream_id - - self.server_conn.h2.safe_send_headers( - self.is_zombie, - self.server_stream_id, - message.headers - ) - self.server_conn.h2.safe_send_body( - self.is_zombie, - self.server_stream_id, - message.body - ) - - def read_response_headers(self): - self.response_arrived.wait() - - status_code = int(self.response_headers.get(':status', 502)) - - return HTTPResponse( - http_version=(2, 0), - status_code=status_code, - reason='', - headers=self.response_headers, - content=None, - timestamp_start=self.timestamp_start, - timestamp_end=self.timestamp_end, - ) - - def read_response_body(self, request, response): - while True: - try: - yield self.data_queue.get(timeout=1) - except Queue.Empty: - pass - if self.data_finished.is_set(): - while self.data_queue.qsize() > 0: - yield self.data_queue.get() - return - if self.zombie: - return - - def send_response_headers(self, response): - self.client_conn.h2.safe_send_headers( - self.is_zombie, - self.client_stream_id, - response.headers - ) - - def send_response_body(self, _response, chunks): - self.client_conn.h2.safe_send_body( - self.is_zombie, - self.client_stream_id, - chunks - ) - - def check_close_connection(self, flow): - # This layer only handles a single stream. - # RFC 7540 8.1: An HTTP request/response exchange fully consumes a single stream. - return True - - def connect(self): - raise ValueError("CONNECT inside an HTTP2 stream is not supported.") - - def set_server(self, *args, **kwargs): - # do not mess with the server connection - all streams share it. - pass - - def run(self): - layer = HttpLayer(self, self.mode) - layer() - self.zombie = time.time() - - class ConnectServerConnection(object): """ @@ -531,7 +118,7 @@ class UpstreamConnectLayer(Layer): def set_server(self, address, server_tls=None, sni=None): if self.ctx.server_conn: self.ctx.disconnect() - address = Address.wrap(address) + address = tcp.Address.wrap(address) self.connect_request.host = address.host self.connect_request.port = address.port self.server_conn.address = address @@ -646,7 +233,7 @@ class HttpLayer(Layer): try: response = make_error_response(code, message) self.send_response(response) - except NetlibException, h2.exceptions.H2Error: + except NetlibException, H2Error: pass def change_upstream_proxy_server(self, address): |