mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-23 16:17:49 +00:00
366 lines
14 KiB
Python
366 lines
14 KiB
Python
from __future__ import (absolute_import, print_function, division)
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import struct
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import threading
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import time
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import Queue
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from netlib.tcp import ssl_read_select
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from netlib.exceptions import HttpException
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from netlib.http import Headers
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import h2
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from h2.connection import H2Connection
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from h2.events import *
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from .base import Layer
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from .http import _HttpTransmissionLayer, HttpLayer
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from .. import utils
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from ..models import HTTPRequest, HTTPResponse
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class SafeH2Connection(H2Connection):
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def __init__(self, conn, *args, **kwargs):
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super(SafeH2Connection, self).__init__(*args, **kwargs)
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self.conn = conn
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self.lock = threading.RLock()
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def safe_close_connection(self, error_code):
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with self.lock:
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self.close_connection(error_code)
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self.conn.send(self.data_to_send())
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def safe_increment_flow_control(self, stream_id, length):
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if length == 0:
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return
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with self.lock:
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self.increment_flow_control_window(length)
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self.conn.send(self.data_to_send())
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with self.lock:
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if stream_id in self.streams and not self.streams[stream_id].closed:
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self.increment_flow_control_window(length, stream_id=stream_id)
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self.conn.send(self.data_to_send())
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def safe_reset_stream(self, stream_id, error_code):
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with self.lock:
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try:
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self.reset_stream(stream_id, error_code)
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except h2.exceptions.StreamClosedError:
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# stream is already closed - good
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pass
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self.conn.send(self.data_to_send())
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def safe_update_settings(self, new_settings):
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with self.lock:
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self.update_settings(new_settings)
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self.conn.send(self.data_to_send())
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def safe_send_headers(self, is_zombie, stream_id, headers):
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with self.lock:
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if is_zombie(self, stream_id):
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return
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self.send_headers(stream_id, headers)
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self.conn.send(self.data_to_send())
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def safe_send_body(self, is_zombie, stream_id, chunks):
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for chunk in chunks:
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position = 0
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while position < len(chunk):
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self.lock.acquire()
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if is_zombie(self, stream_id):
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return
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max_outbound_frame_size = self.max_outbound_frame_size
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frame_chunk = chunk[position:position+max_outbound_frame_size]
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if self.local_flow_control_window(stream_id) < len(frame_chunk):
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self.lock.release()
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time.sleep(0)
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continue
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self.send_data(stream_id, frame_chunk)
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self.conn.send(self.data_to_send())
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self.lock.release()
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position += max_outbound_frame_size
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with self.lock:
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if is_zombie(self, stream_id):
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return
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self.end_stream(stream_id)
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self.conn.send(self.data_to_send())
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class Http2Layer(Layer):
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def __init__(self, ctx, mode):
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super(Http2Layer, self).__init__(ctx)
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self.mode = mode
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self.streams = dict()
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self.server_to_client_stream_ids = dict([(0, 0)])
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self.client_conn.h2 = SafeH2Connection(self.client_conn, client_side=False)
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# make sure that we only pass actual SSL.Connection objects in here,
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# because otherwise ssl_read_select fails!
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self.active_conns = [self.client_conn.connection]
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def _initiate_server_conn(self):
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self.server_conn.h2 = SafeH2Connection(self.server_conn, client_side=True)
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self.server_conn.h2.initiate_connection()
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self.server_conn.send(self.server_conn.h2.data_to_send())
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self.active_conns.append(self.server_conn.connection)
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def connect(self):
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self.ctx.connect()
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self.server_conn.connect()
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self._initiate_server_conn()
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def set_server(self):
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raise NotImplementedError("Cannot change server for HTTP2 connections.")
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def disconnect(self):
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raise NotImplementedError("Cannot dis- or reconnect in HTTP2 connections.")
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def next_layer(self):
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# WebSockets over HTTP/2?
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# CONNECT for proxying?
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raise NotImplementedError()
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def _handle_event(self, event, source_conn, other_conn, is_server):
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if hasattr(event, 'stream_id'):
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if is_server and event.stream_id % 2 == 1:
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eid = self.server_to_client_stream_ids[event.stream_id]
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else:
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eid = event.stream_id
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if isinstance(event, RequestReceived):
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headers = Headers([[str(k), str(v)] for k, v in event.headers])
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self.streams[eid] = Http2SingleStreamLayer(self, eid, headers)
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self.streams[eid].timestamp_start = time.time()
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self.streams[eid].start()
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elif isinstance(event, ResponseReceived):
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headers = Headers([[str(k), str(v)] for k, v in event.headers])
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self.streams[eid].queued_data_length = 0
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self.streams[eid].timestamp_start = time.time()
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self.streams[eid].response_headers = headers
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self.streams[eid].response_arrived.set()
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elif isinstance(event, DataReceived):
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if self.config.body_size_limit and self.streams[eid].queued_data_length > self.config.body_size_limit:
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raise HttpException("HTTP body too large. Limit is {}.".format(self.config.body_size_limit))
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self.streams[eid].data_queue.put(event.data)
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self.streams[eid].queued_data_length += len(event.data)
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source_conn.h2.safe_increment_flow_control(event.stream_id, len(event.data))
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elif isinstance(event, StreamEnded):
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self.streams[eid].timestamp_end = time.time()
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self.streams[eid].data_finished.set()
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elif isinstance(event, StreamReset):
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self.streams[eid].zombie = time.time()
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if eid in self.streams and event.error_code == 0x8:
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if is_server:
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other_stream_id = self.streams[eid].client_stream_id
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else:
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other_stream_id = self.streams[eid].server_stream_id
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other_conn.h2.safe_reset_stream(other_stream_id, event.error_code)
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elif isinstance(event, RemoteSettingsChanged):
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new_settings = dict([(id, cs.new_value) for (id, cs) in event.changed_settings.iteritems()])
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other_conn.h2.safe_update_settings(new_settings)
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elif isinstance(event, ConnectionTerminated):
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other_conn.h2.safe_close_connection(event.error_code)
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return False
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elif isinstance(event, PushedStreamReceived):
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# pushed stream ids should be uniq and not dependent on race conditions
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# only the parent stream id must be looked up first
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parent_eid = self.server_to_client_stream_ids[event.parent_stream_id]
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with self.client_conn.h2.lock:
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self.client_conn.h2.push_stream(parent_eid, event.pushed_stream_id, event.headers)
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headers = Headers([[str(k), str(v)] for k, v in event.headers])
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headers['x-mitmproxy-pushed'] = 'true'
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self.streams[event.pushed_stream_id] = Http2SingleStreamLayer(self, event.pushed_stream_id, headers)
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self.streams[event.pushed_stream_id].timestamp_start = time.time()
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self.streams[event.pushed_stream_id].pushed = True
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self.streams[event.pushed_stream_id].parent_stream_id = parent_eid
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self.streams[event.pushed_stream_id].timestamp_end = time.time()
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self.streams[event.pushed_stream_id].data_finished.set()
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self.streams[event.pushed_stream_id].start()
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elif isinstance(event, TrailersReceived):
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raise NotImplementedError()
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return True
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def _cleanup_streams(self):
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death_time = time.time() - 10
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for stream_id in self.streams.keys():
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zombie = self.streams[stream_id].zombie
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if zombie and zombie <= death_time:
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self.streams.pop(stream_id, None)
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def __call__(self):
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if self.server_conn:
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self._initiate_server_conn()
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preamble = self.client_conn.rfile.read(24)
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self.client_conn.h2.initiate_connection()
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self.client_conn.h2.receive_data(preamble)
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self.client_conn.send(self.client_conn.h2.data_to_send())
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while True:
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r = ssl_read_select(self.active_conns, 1)
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for conn in r:
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source_conn = self.client_conn if conn == self.client_conn.connection else self.server_conn
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other_conn = self.server_conn if conn == self.client_conn.connection else self.client_conn
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is_server = (conn == self.server_conn.connection)
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field = source_conn.rfile.peek(3)
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length = int(field.encode('hex'), 16)
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raw_frame = source_conn.rfile.safe_read(9 + length)
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with source_conn.h2.lock:
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events = source_conn.h2.receive_data(raw_frame)
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source_conn.send(source_conn.h2.data_to_send())
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for event in events:
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if not self._handle_event(event, source_conn, other_conn, is_server):
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return
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self._cleanup_streams()
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class Http2SingleStreamLayer(_HttpTransmissionLayer, threading.Thread):
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def __init__(self, ctx, stream_id, request_headers):
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super(Http2SingleStreamLayer, self).__init__(ctx)
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self.zombie = None
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self.client_stream_id = stream_id
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self.server_stream_id = None
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self.request_headers = request_headers
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self.response_headers = None
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self.data_queue = Queue.Queue()
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self.queued_data_length = 0
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self.response_arrived = threading.Event()
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self.data_finished = threading.Event()
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def is_zombie(self, h2_conn, stream_id):
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if self.zombie:
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return True
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return False
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def read_request(self):
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self.data_finished.wait()
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self.data_finished.clear()
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authority = self.request_headers.get(':authority', '')
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method = self.request_headers.get(':method', 'GET')
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scheme = self.request_headers.get(':scheme', 'https')
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path = self.request_headers.get(':path', '/')
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host = None
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port = None
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if path == '*' or path.startswith("/"):
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form_in = "relative"
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elif method == 'CONNECT':
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form_in = "authority"
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if ":" in authority:
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host, port = authority.split(":", 1)
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else:
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host = authority
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else:
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form_in = "absolute"
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# FIXME: verify if path or :host contains what we need
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scheme, host, port, _ = utils.parse_url(path)
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if host is None:
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host = 'localhost'
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if port is None:
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port = 80 if scheme == 'http' else 443
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port = int(port)
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data = []
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while self.data_queue.qsize() > 0:
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data.append(self.data_queue.get())
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data = b"".join(data)
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return HTTPRequest(
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form_in,
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method,
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scheme,
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host,
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port,
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path,
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(2, 0),
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self.request_headers,
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data,
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timestamp_start=self.timestamp_start,
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timestamp_end=self.timestamp_end,
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)
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def send_request(self, message):
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with self.server_conn.h2.lock:
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self.server_stream_id = self.server_conn.h2.get_next_available_stream_id()
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self.server_to_client_stream_ids[self.server_stream_id] = self.client_stream_id
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self.server_conn.h2.safe_send_headers(
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self.is_zombie,
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self.server_stream_id,
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message.headers
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)
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self.server_conn.h2.safe_send_body(
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self.is_zombie,
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self.server_stream_id,
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message.body
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)
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def read_response_headers(self):
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self.response_arrived.wait()
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status_code = int(self.response_headers.get(':status', 502))
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return HTTPResponse(
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http_version=(2, 0),
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status_code=status_code,
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reason='',
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headers=self.response_headers,
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content=None,
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timestamp_start=self.timestamp_start,
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timestamp_end=self.timestamp_end,
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)
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def read_response_body(self, request, response):
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while True:
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try:
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yield self.data_queue.get(timeout=1)
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except Queue.Empty:
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pass
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if self.data_finished.is_set():
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while self.data_queue.qsize() > 0:
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yield self.data_queue.get()
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return
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if self.zombie:
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return
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def send_response_headers(self, response):
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self.client_conn.h2.safe_send_headers(
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self.is_zombie,
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self.client_stream_id,
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response.headers
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)
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def send_response_body(self, _response, chunks):
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self.client_conn.h2.safe_send_body(
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self.is_zombie,
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self.client_stream_id,
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chunks
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)
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def check_close_connection(self, flow):
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# This layer only handles a single stream.
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# RFC 7540 8.1: An HTTP request/response exchange fully consumes a single stream.
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return True
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def connect(self):
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raise ValueError("CONNECT inside an HTTP2 stream is not supported.")
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def set_server(self, *args, **kwargs):
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# do not mess with the server connection - all streams share it.
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pass
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def run(self):
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layer = HttpLayer(self, self.mode)
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layer()
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self.zombie = time.time()
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