mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-27 18:31:22 +00:00
335 lines
12 KiB
Python
335 lines
12 KiB
Python
from __future__ import (absolute_import, print_function, division)
|
|
|
|
from .. import version
|
|
from ..exceptions import InvalidCredentials, HttpException, ProtocolException
|
|
from .layer import Layer, ServerConnectionMixin
|
|
from libmproxy import utils
|
|
from .messages import SetServer, Connect, Reconnect, Kill
|
|
from libmproxy.protocol import KILL
|
|
|
|
from libmproxy.protocol.http import HTTPFlow
|
|
from libmproxy.protocol.http_wrappers import HTTPResponse, HTTPRequest
|
|
from libmproxy.protocol2.http_protocol_mock import HTTP1
|
|
from libmproxy.protocol2.tls import TlsLayer
|
|
from netlib import tcp
|
|
from netlib.http import status_codes, http1
|
|
from netlib.http.semantics import CONTENT_MISSING
|
|
from netlib import odict
|
|
|
|
|
|
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):
|
|
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 HttpLayer(Layer):
|
|
|
|
"""
|
|
HTTP 1 Layer
|
|
"""
|
|
|
|
def __init__(self, ctx, mode):
|
|
super(HttpLayer, self).__init__(ctx)
|
|
self.mode = mode
|
|
|
|
def __call__(self):
|
|
while True:
|
|
try:
|
|
request = HTTP1.read_request(
|
|
self.client_conn,
|
|
body_size_limit=self.config.body_size_limit
|
|
)
|
|
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":
|
|
yield SetServer((request.host, request.port), False, None)
|
|
self.send_to_client(make_connect_response(request.httpversion))
|
|
layer = self.ctx.next_layer(self)
|
|
for message in layer():
|
|
if not self._handle_server_message(message):
|
|
yield message
|
|
return
|
|
|
|
# Make sure that the incoming request matches our expectations
|
|
self.validate_request(request)
|
|
|
|
flow = HTTPFlow(self.client_conn, self.server_conn)
|
|
flow.request = request
|
|
for message in self.process_request_hook(flow):
|
|
yield message
|
|
|
|
if not flow.response:
|
|
for message in self.establish_server_connection(flow):
|
|
yield message
|
|
for message in self.get_response_from_server(flow):
|
|
yield message
|
|
|
|
self.send_response_to_client(flow)
|
|
|
|
if self.check_close_connection(flow):
|
|
return
|
|
|
|
if flow.request.form_in == "authority" and flow.response.code == 200:
|
|
raise NotImplementedError("Upstream mode CONNECT not implemented")
|
|
|
|
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 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_to_client(flow.response)
|
|
else:
|
|
# streaming:
|
|
# First send the headers and then transfer the response
|
|
# incrementally:
|
|
h = HTTP1._assemble_response_first_line(flow.response)
|
|
self.send_to_client(h + "\r\n")
|
|
h = HTTP1._assemble_response_headers(flow.response, preserve_transfer_encoding=True)
|
|
self.send_to_client(h + "\r\n")
|
|
|
|
chunks = HTTP1.read_http_body_chunked(
|
|
flow.response.headers,
|
|
self.config.body_size_limit,
|
|
flow.request.method,
|
|
flow.response.code,
|
|
False,
|
|
4096
|
|
)
|
|
|
|
if callable(flow.response.stream):
|
|
chunks = flow.response.stream(chunks)
|
|
|
|
for chunk in chunks:
|
|
for part in chunk:
|
|
self.send_to_client(part)
|
|
self.client_conn.wfile.flush()
|
|
|
|
flow.response.timestamp_end = utils.timestamp()
|
|
|
|
def get_response_from_server(self, flow):
|
|
|
|
self.send_to_server(flow.request)
|
|
|
|
flow.response = HTTP1.read_response(
|
|
self.server_conn,
|
|
flow.request.method,
|
|
body_size_limit=self.config.body_size_limit,
|
|
include_body=False,
|
|
)
|
|
|
|
# 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:
|
|
yield Kill()
|
|
|
|
if flow.response.stream:
|
|
flow.response.content = CONTENT_MISSING
|
|
else:
|
|
flow.response.content = HTTP1.read_http_body(
|
|
self.server_conn,
|
|
flow.response.headers,
|
|
self.config.body_size_limit,
|
|
flow.request.method,
|
|
flow.response.code,
|
|
False
|
|
)
|
|
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:
|
|
yield 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.ctx.server_address.host
|
|
flow.request.port = self.ctx.server_address.port
|
|
flow.request.scheme = "https" if self.server_conn.tls_established else "http"
|
|
|
|
# TODO: Expose ChangeServer functionality to inline scripts somehow? (yield_from_callback?)
|
|
request_reply = self.channel.ask("request", flow)
|
|
if request_reply is None or request_reply == KILL:
|
|
yield 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 self.server_address != address or tls != self.server_conn.ssl_established:
|
|
yield SetServer(address, tls, address.host)
|
|
# Establish connection is neccessary.
|
|
if not self.server_conn:
|
|
yield Connect()
|
|
|
|
# ChangeServer 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 tls:
|
|
raise HttpException("Cannot change scheme in upstream proxy mode.")
|
|
"""
|
|
# This is a very ugly (untested) workaround to solve a very ugly problem.
|
|
# FIXME: Check if connected first.
|
|
if self.server_conn.tls_established and not ssl:
|
|
yield Reconnect()
|
|
elif ssl and not hasattr(self, "connected_to") or self.connected_to != address:
|
|
if self.server_conn.tls_established:
|
|
yield Reconnect()
|
|
|
|
self.send_to_server(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_resplonse(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_to_client(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_to_client(make_error_response(
|
|
407,
|
|
"Proxy Authentication Required",
|
|
self.config.authenticator.auth_challenge_headers()
|
|
))
|
|
raise InvalidCredentials("Proxy Authentication Required")
|
|
|
|
def send_to_server(self, message):
|
|
self.server_conn.send(HTTP1.assemble(message))
|
|
|
|
|
|
def send_to_client(self, message):
|
|
# FIXME
|
|
# - possibly do some http2 stuff here
|
|
self.client_conn.send(HTTP1.assemble(message))
|