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update pydivert, fix #1749

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This commit is contained in:
Maximilian Hils 2016-11-21 14:14:52 +01:00
parent ebff5f2466
commit f644665cd9
2 changed files with 44 additions and 42 deletions
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84
mitmproxy/platform/windows.py
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@ -8,8 +8,8 @@ import threading
import time
import configargparse
from pydivert import enum
from pydivert import windivert
import pydivert
import pydivert.consts
import pickle
import socketserver
@ -149,7 +149,7 @@ class TransparentProxy:
Limitations:
- No IPv6 support. (Pull Requests welcome)
- TCP ports do not get re-used simulateously on the client, i.e. the proxy will fail if application X
- TCP ports do not get re-used simultaneously on the client, i.e. the proxy will fail if application X
connects to example.com and example.org from 192.168.0.42:4242 simultaneously. This could be mitigated by
introducing unique "meta-addresses" which mitmproxy sees, but this would remove the correct client info from
mitmproxy.
@ -197,13 +197,10 @@ class TransparentProxy:
self.api_thread = threading.Thread(target=self.api.serve_forever)
self.api_thread.daemon = True
self.driver = windivert.WinDivert()
self.driver.register()
self.request_filter = custom_filter or " or ".join(
("tcp.DstPort == %d" %
p) for p in redirect_ports)
self.request_forward_handle = None
self.request_forward_handle = None # type: pydivert.WinDivert
self.request_forward_thread = threading.Thread(
target=self.request_forward)
self.request_forward_thread.daemon = True
@ -212,18 +209,18 @@ class TransparentProxy:
self.trusted_pids = set()
self.tcptable2 = MIB_TCPTABLE2(0)
self.tcptable2_size = ctypes.wintypes.DWORD(0)
self.request_local_handle = None
self.request_local_handle = None # type: pydivert.WinDivert
self.request_local_thread = threading.Thread(target=self.request_local)
self.request_local_thread.daemon = True
# The proxy server responds to the client. To the client,
# this response should look like it has been sent by the real target
self.response_filter = "outbound and tcp.SrcPort == %d" % proxy_port
self.response_handle = None
self.response_handle = None # type: pydivert.WinDivert
self.response_thread = threading.Thread(target=self.response)
self.response_thread.daemon = True
self.icmp_handle = None
self.icmp_handle = None # type: pydivert.WinDivert
@classmethod
def setup(cls):
@ -241,25 +238,33 @@ class TransparentProxy:
# Block all ICMP requests (which are sent on Windows by default).
# In layman's terms: If we don't do this, our proxy machine tells the client that it can directly connect to the
# real gateway if they are on the same network.
self.icmp_handle = self.driver.open_handle(
self.icmp_handle = pydivert.WinDivert(
filter="icmp",
layer=enum.Layer.NETWORK,
flags=enum.Flag.DROP)
layer=pydivert.Layer.NETWORK,
flags=pydivert.Flag.DROP
)
self.icmp_handle.open()
self.response_handle = self.driver.open_handle(
self.response_handle = pydivert.WinDivert(
filter=self.response_filter,
layer=enum.Layer.NETWORK)
layer=pydivert.Layer.NETWORK
)
self.response_handle.open()
self.response_thread.start()
if self.mode == "forward" or self.mode == "both":
self.request_forward_handle = self.driver.open_handle(
self.request_forward_handle = pydivert.WinDivert(
filter=self.request_filter,
layer=enum.Layer.NETWORK_FORWARD)
layer=pydivert.Layer.NETWORK_FORWARD
)
self.request_forward_handle.open()
self.request_forward_thread.start()
if self.mode == "local" or self.mode == "both":
self.request_local_handle = self.driver.open_handle(
self.request_local_handle = pydivert.WinDivert(
filter=self.request_filter,
layer=enum.Layer.NETWORK)
layer=pydivert.Layer.NETWORK
)
self.request_local_handle.open()
self.request_local_thread.start()
def shutdown(self):
@ -272,17 +277,16 @@ class TransparentProxy:
self.icmp_handle.close()
self.api.shutdown()
def recv(self, handle):
def recv(self, handle: pydivert.WinDivert) -> pydivert.Packet:
"""
Convenience function that receives a packet from the passed handler and handles error codes.
If the process has been shut down, (None, None) is returned.
"""
try:
raw_packet, metadata = handle.recv()
return self.driver.parse_packet(raw_packet), metadata
return handle.recv()
except WindowsError as e:
if e.winerror == 995:
return None, None
return None
else:
raise
@ -306,7 +310,7 @@ class TransparentProxy:
def request_local(self):
while True:
packet, metadata = self.recv(self.request_local_handle)
packet = self.recv(self.request_local_handle)
if not packet:
return
@ -321,49 +325,47 @@ class TransparentProxy:
pid = self.addr_pid_map.get(client, None)
if pid not in self.trusted_pids:
self._request(packet, metadata)
self._request(packet)
else:
self.request_local_handle.send((packet.raw, metadata))
self.request_local_handle.send(packet, recalculate_checksum=False)
def request_forward(self):
"""
Redirect packages to the proxy
"""
while True:
packet, metadata = self.recv(self.request_forward_handle)
packet = self.recv(self.request_forward_handle)
if not packet:
return
self._request(packet, metadata)
self._request(packet)
def _request(self, packet, metadata):
def _request(self, packet: pydivert.Packet):
# print(" * Redirect client -> server to proxy")
# print("%s:%s -> %s:%s" % (packet.src_addr, packet.src_port, packet.dst_addr, packet.dst_port))
client = (packet.src_addr, packet.src_port)
server = (packet.dst_addr, packet.dst_port)
if client in self.client_server_map:
# Force re-add to mark as "newest" entry in the dict.
del self.client_server_map[client]
while len(self.client_server_map) > self.connection_cache_size:
self.client_server_map.popitem(False)
self.client_server_map[client] = server
self.client_server_map.move_to_end(client)
else:
while len(self.client_server_map) > self.connection_cache_size:
self.client_server_map.popitem(False)
self.client_server_map[client] = server
packet.dst_addr, packet.dst_port = self.proxy_addr, self.proxy_port
metadata.direction = enum.Direction.INBOUND
packet.direction = pydivert.consts.Direction.INBOUND
packet = self.driver.update_packet_checksums(packet)
# Use any handle thats on the NETWORK layer - request_local may be
# unavailable.
self.response_handle.send((packet.raw, metadata))
self.response_handle.send(packet)
def response(self):
"""
Spoof source address of packets send from the proxy to the client
"""
while True:
packet, metadata = self.recv(self.response_handle)
packet = self.recv(self.response_handle)
if not packet:
return
@ -373,11 +375,11 @@ class TransparentProxy:
server = self.client_server_map.get(client, None)
if server:
packet.src_addr, packet.src_port = server
packet.recalculate_checksums()
else:
print("Warning: Previously unseen connection from proxy to %s:%s." % client)
packet = self.driver.update_packet_checksums(packet)
self.response_handle.send((packet.raw, metadata))
self.response_handle.send(packet, recalculate_checksum=False)
if __name__ == "__main__":

2
setup.py
View File

@ -87,7 +87,7 @@ setup(
],
extras_require={
':sys_platform == "win32"': [
"pydivert>=0.0.7, <2.0",
"pydivert>=2.0.3, <2.1",
],
':sys_platform != "win32"': [
],