421 lines
14 KiB
Python
421 lines
14 KiB
Python
import itertools
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import time
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import hyperframe.frame
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from hpack.hpack import Encoder, Decoder
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from mitmproxy.net.http import http2
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import mitmproxy.net.http.headers
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import mitmproxy.net.http.response
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import mitmproxy.net.http.request
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from mitmproxy.types import bidi
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from .. import language
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class TCPHandler:
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def __init__(self, rfile, wfile=None):
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self.rfile = rfile
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self.wfile = wfile
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class HTTP2StateProtocol:
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ERROR_CODES = bidi.BiDi(
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NO_ERROR=0x0,
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PROTOCOL_ERROR=0x1,
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INTERNAL_ERROR=0x2,
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FLOW_CONTROL_ERROR=0x3,
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SETTINGS_TIMEOUT=0x4,
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STREAM_CLOSED=0x5,
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FRAME_SIZE_ERROR=0x6,
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REFUSED_STREAM=0x7,
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CANCEL=0x8,
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COMPRESSION_ERROR=0x9,
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CONNECT_ERROR=0xa,
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ENHANCE_YOUR_CALM=0xb,
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INADEQUATE_SECURITY=0xc,
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HTTP_1_1_REQUIRED=0xd
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)
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CLIENT_CONNECTION_PREFACE = b'PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n'
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HTTP2_DEFAULT_SETTINGS = {
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hyperframe.frame.SettingsFrame.HEADER_TABLE_SIZE: 4096,
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hyperframe.frame.SettingsFrame.ENABLE_PUSH: 1,
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hyperframe.frame.SettingsFrame.MAX_CONCURRENT_STREAMS: None,
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hyperframe.frame.SettingsFrame.INITIAL_WINDOW_SIZE: 2 ** 16 - 1,
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hyperframe.frame.SettingsFrame.MAX_FRAME_SIZE: 2 ** 14,
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hyperframe.frame.SettingsFrame.MAX_HEADER_LIST_SIZE: None,
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}
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def __init__(
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self,
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tcp_handler=None,
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rfile=None,
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wfile=None,
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is_server=False,
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dump_frames=False,
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encoder=None,
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decoder=None,
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unhandled_frame_cb=None,
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):
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self.tcp_handler = tcp_handler or TCPHandler(rfile, wfile)
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self.is_server = is_server
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self.dump_frames = dump_frames
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self.encoder = encoder or Encoder()
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self.decoder = decoder or Decoder()
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self.unhandled_frame_cb = unhandled_frame_cb
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self.http2_settings = self.HTTP2_DEFAULT_SETTINGS.copy()
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self.current_stream_id = None
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self.connection_preface_performed = False
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def read_request(
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self,
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__rfile,
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include_body=True,
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body_size_limit=None,
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allow_empty=False,
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):
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if body_size_limit is not None:
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raise NotImplementedError()
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self.perform_connection_preface()
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timestamp_start = time.time()
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if hasattr(self.tcp_handler.rfile, "reset_timestamps"):
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self.tcp_handler.rfile.reset_timestamps()
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stream_id, headers, body = self._receive_transmission(
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include_body=include_body,
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)
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if hasattr(self.tcp_handler.rfile, "first_byte_timestamp"):
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# more accurate timestamp_start
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timestamp_start = self.tcp_handler.rfile.first_byte_timestamp
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timestamp_end = time.time()
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first_line_format, method, scheme, host, port, path = http2.parse_headers(headers)
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request = mitmproxy.net.http.request.Request(
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first_line_format,
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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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b"HTTP/2.0",
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headers,
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body,
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timestamp_start,
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timestamp_end,
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)
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request.stream_id = stream_id
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return request
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def read_response(
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self,
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__rfile,
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request_method=b'',
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body_size_limit=None,
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include_body=True,
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stream_id=None,
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):
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if body_size_limit is not None:
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raise NotImplementedError()
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self.perform_connection_preface()
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timestamp_start = time.time()
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if hasattr(self.tcp_handler.rfile, "reset_timestamps"):
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self.tcp_handler.rfile.reset_timestamps()
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stream_id, headers, body = self._receive_transmission(
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stream_id=stream_id,
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include_body=include_body,
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)
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if hasattr(self.tcp_handler.rfile, "first_byte_timestamp"):
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# more accurate timestamp_start
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timestamp_start = self.tcp_handler.rfile.first_byte_timestamp
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if include_body:
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timestamp_end = time.time()
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else:
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timestamp_end = None
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response = mitmproxy.net.http.response.Response(
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b"HTTP/2.0",
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int(headers.get(':status', 502)),
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b'',
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headers,
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body,
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timestamp_start=timestamp_start,
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timestamp_end=timestamp_end,
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)
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response.stream_id = stream_id
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return response
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def assemble(self, message):
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if isinstance(message, mitmproxy.net.http.request.Request):
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return self.assemble_request(message)
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elif isinstance(message, mitmproxy.net.http.response.Response):
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return self.assemble_response(message)
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else:
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raise ValueError("HTTP message not supported.")
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def assemble_request(self, request):
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assert isinstance(request, mitmproxy.net.http.request.Request)
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authority = self.tcp_handler.sni if self.tcp_handler.sni else self.tcp_handler.address[0]
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if self.tcp_handler.address[1] != 443:
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authority += ":%d" % self.tcp_handler.address[1]
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headers = request.headers.copy()
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if ':authority' not in headers:
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headers.insert(0, ':authority', authority)
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headers.insert(0, ':scheme', request.scheme)
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headers.insert(0, ':path', request.path)
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headers.insert(0, ':method', request.method)
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if hasattr(request, 'stream_id'):
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stream_id = request.stream_id
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else:
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stream_id = self._next_stream_id()
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return list(itertools.chain(
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self._create_headers(headers, stream_id, end_stream=(request.content is None or len(request.content) == 0)),
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self._create_body(request.content, stream_id)))
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def assemble_response(self, response):
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assert isinstance(response, mitmproxy.net.http.response.Response)
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headers = response.headers.copy()
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if ':status' not in headers:
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headers.insert(0, b':status', str(response.status_code).encode())
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if hasattr(response, 'stream_id'):
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stream_id = response.stream_id
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else:
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stream_id = self._next_stream_id()
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return list(itertools.chain(
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self._create_headers(headers, stream_id, end_stream=(response.content is None or len(response.content) == 0)),
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self._create_body(response.content, stream_id),
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))
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def perform_connection_preface(self, force=False):
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if force or not self.connection_preface_performed:
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if self.is_server:
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self.perform_server_connection_preface(force)
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else:
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self.perform_client_connection_preface(force)
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def perform_server_connection_preface(self, force=False):
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if force or not self.connection_preface_performed:
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self.connection_preface_performed = True
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magic_length = len(self.CLIENT_CONNECTION_PREFACE)
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magic = self.tcp_handler.rfile.safe_read(magic_length)
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assert magic == self.CLIENT_CONNECTION_PREFACE
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frm = hyperframe.frame.SettingsFrame(settings={
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hyperframe.frame.SettingsFrame.ENABLE_PUSH: 0,
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hyperframe.frame.SettingsFrame.MAX_CONCURRENT_STREAMS: 1,
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})
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self.send_frame(frm, hide=True)
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self._receive_settings(hide=True)
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def perform_client_connection_preface(self, force=False):
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if force or not self.connection_preface_performed:
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self.connection_preface_performed = True
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self.tcp_handler.wfile.write(self.CLIENT_CONNECTION_PREFACE)
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self.send_frame(hyperframe.frame.SettingsFrame(), hide=True)
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self._receive_settings(hide=True) # server announces own settings
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self._receive_settings(hide=True) # server acks my settings
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def send_frame(self, frm, hide=False):
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raw_bytes = frm.serialize()
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self.tcp_handler.wfile.write(raw_bytes)
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self.tcp_handler.wfile.flush()
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if not hide and self.dump_frames: # pragma: no cover
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print(">> " + repr(frm))
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def read_frame(self, hide=False):
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while True:
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frm = http2.parse_frame(*http2.read_raw_frame(self.tcp_handler.rfile))
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if not hide and self.dump_frames: # pragma: no cover
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print("<< " + repr(frm))
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if isinstance(frm, hyperframe.frame.PingFrame):
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raw_bytes = hyperframe.frame.PingFrame(flags=['ACK'], payload=frm.payload).serialize()
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self.tcp_handler.wfile.write(raw_bytes)
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self.tcp_handler.wfile.flush()
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continue
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if isinstance(frm, hyperframe.frame.SettingsFrame) and 'ACK' not in frm.flags:
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self._apply_settings(frm.settings, hide)
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if isinstance(frm, hyperframe.frame.DataFrame) and frm.flow_controlled_length > 0:
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self._update_flow_control_window(frm.stream_id, frm.flow_controlled_length)
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return frm
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def check_alpn(self):
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alp = self.tcp_handler.get_alpn_proto_negotiated()
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if alp != b'h2':
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raise NotImplementedError(
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"HTTP2Protocol can not handle unknown ALPN value: %s" % alp)
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return True
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def _handle_unexpected_frame(self, frm):
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if isinstance(frm, hyperframe.frame.SettingsFrame):
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return
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if self.unhandled_frame_cb:
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self.unhandled_frame_cb(frm)
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def _receive_settings(self, hide=False):
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while True:
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frm = self.read_frame(hide)
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if isinstance(frm, hyperframe.frame.SettingsFrame):
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break
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else:
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self._handle_unexpected_frame(frm)
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def _next_stream_id(self):
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if self.current_stream_id is None:
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if self.is_server:
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# servers must use even stream ids
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self.current_stream_id = 2
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else:
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# clients must use odd stream ids
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self.current_stream_id = 1
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else:
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self.current_stream_id += 2
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return self.current_stream_id
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def _apply_settings(self, settings, hide=False):
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for setting, value in settings.items():
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old_value = self.http2_settings[setting]
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if not old_value:
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old_value = '-'
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self.http2_settings[setting] = value
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frm = hyperframe.frame.SettingsFrame(flags=['ACK'])
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self.send_frame(frm, hide)
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def _update_flow_control_window(self, stream_id, increment):
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frm = hyperframe.frame.WindowUpdateFrame(stream_id=0, window_increment=increment)
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self.send_frame(frm)
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frm = hyperframe.frame.WindowUpdateFrame(stream_id=stream_id, window_increment=increment)
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self.send_frame(frm)
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def _create_headers(self, headers, stream_id, end_stream=True):
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def frame_cls(chunks):
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for i in chunks:
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if i == 0:
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yield hyperframe.frame.HeadersFrame, i
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else:
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yield hyperframe.frame.ContinuationFrame, i
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header_block_fragment = self.encoder.encode(headers.fields)
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chunk_size = self.http2_settings[hyperframe.frame.SettingsFrame.MAX_FRAME_SIZE]
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chunks = range(0, len(header_block_fragment), chunk_size)
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frms = [frm_cls(
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flags=[],
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stream_id=stream_id,
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data=header_block_fragment[i:i + chunk_size]) for frm_cls, i in frame_cls(chunks)]
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frms[-1].flags.add('END_HEADERS')
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if end_stream:
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frms[0].flags.add('END_STREAM')
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if self.dump_frames: # pragma: no cover
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for frm in frms:
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print(">> ", repr(frm))
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return [frm.serialize() for frm in frms]
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def _create_body(self, body, stream_id):
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if body is None or len(body) == 0:
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return b''
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chunk_size = self.http2_settings[hyperframe.frame.SettingsFrame.MAX_FRAME_SIZE]
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chunks = range(0, len(body), chunk_size)
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frms = [hyperframe.frame.DataFrame(
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flags=[],
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stream_id=stream_id,
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data=body[i:i + chunk_size]) for i in chunks]
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frms[-1].flags.add('END_STREAM')
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if self.dump_frames: # pragma: no cover
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for frm in frms:
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print(">> ", repr(frm))
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return [frm.serialize() for frm in frms]
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def _receive_transmission(self, stream_id=None, include_body=True):
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if not include_body:
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raise NotImplementedError()
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body_expected = True
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header_blocks = b''
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body = b''
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while True:
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frm = self.read_frame()
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if (
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(isinstance(frm, hyperframe.frame.HeadersFrame) or isinstance(frm, hyperframe.frame.ContinuationFrame)) and
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(stream_id is None or frm.stream_id == stream_id)
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):
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stream_id = frm.stream_id
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header_blocks += frm.data
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if 'END_STREAM' in frm.flags:
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body_expected = False
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if 'END_HEADERS' in frm.flags:
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break
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else:
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self._handle_unexpected_frame(frm)
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while body_expected:
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frm = self.read_frame()
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if isinstance(frm, hyperframe.frame.DataFrame) and frm.stream_id == stream_id:
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body += frm.data
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if 'END_STREAM' in frm.flags:
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break
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else:
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self._handle_unexpected_frame(frm)
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headers = mitmproxy.net.http.headers.Headers(
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[[k, v] for k, v in self.decoder.decode(header_blocks, raw=True)]
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)
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return stream_id, headers, body
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class HTTP2Protocol:
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def __init__(self, pathod_handler):
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self.pathod_handler = pathod_handler
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self.wire_protocol = HTTP2StateProtocol(
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self.pathod_handler, is_server=True, dump_frames=self.pathod_handler.http2_framedump
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)
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def make_error_response(self, reason, body):
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return language.http2.make_error_response(reason, body)
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def read_request(self, lg=None):
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self.wire_protocol.perform_server_connection_preface()
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return self.wire_protocol.read_request(self.pathod_handler.rfile)
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def assemble(self, message):
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return self.wire_protocol.assemble(message)
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