/
mode_servers.py
430 lines (357 loc) · 15.7 KB
/
mode_servers.py
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"""
This module defines "server instances", which manage
the TCP/UDP servers spawned by mitmproxy as specified by the proxy mode.
Example:
mode = ProxyMode.parse("reverse:https://example.com")
inst = ServerInstance.make(mode, manager_that_handles_callbacks)
await inst.start()
# TCP server is running now.
"""
from __future__ import annotations
import asyncio
import json
import logging
import socket
import textwrap
import typing
from abc import ABCMeta, abstractmethod
from contextlib import contextmanager
from pathlib import Path
from typing import ClassVar, Generic, TypeVar, cast, get_args
import errno
import mitmproxy_wireguard as wg
from mitmproxy import ctx, flow, platform
from mitmproxy.connection import Address
from mitmproxy.master import Master
from mitmproxy.net import local_ip, udp
from mitmproxy.net.udp_wireguard import WireGuardDatagramTransport
from mitmproxy.proxy import commands, layers, mode_specs, server
from mitmproxy.proxy.context import Context
from mitmproxy.proxy.layer import Layer
from mitmproxy.utils import human
logger = logging.getLogger(__name__)
class ProxyConnectionHandler(server.LiveConnectionHandler):
master: Master
def __init__(self, master, r, w, options, mode):
self.master = master
super().__init__(r, w, options, mode)
self.log_prefix = f"{human.format_address(self.client.peername)}: "
async def handle_hook(self, hook: commands.StartHook) -> None:
with self.timeout_watchdog.disarm():
# We currently only support single-argument hooks.
(data,) = hook.args()
await self.master.addons.handle_lifecycle(hook)
if isinstance(data, flow.Flow):
await data.wait_for_resume() # pragma: no cover
M = TypeVar('M', bound=mode_specs.ProxyMode)
class ServerManager(typing.Protocol):
connections: dict[tuple, ProxyConnectionHandler]
@contextmanager
def register_connection(self, connection_id: tuple, handler: ProxyConnectionHandler):
... # pragma: no cover
# Python 3.11: Use typing.Self
Self = TypeVar("Self", bound="ServerInstance")
class ServerInstance(Generic[M], metaclass=ABCMeta):
__modes: ClassVar[dict[str, type[ServerInstance]]] = {}
def __init__(self, mode: M, manager: ServerManager):
self.mode: M = mode
self.manager: ServerManager = manager
self.last_exception: Exception | None = None
def __init_subclass__(cls, **kwargs):
"""Register all subclasses so that make() finds them."""
# extract mode from Generic[Mode].
mode = get_args(cls.__orig_bases__[0])[0]
if not isinstance(mode, TypeVar):
assert issubclass(mode, mode_specs.ProxyMode)
assert mode.type not in ServerInstance.__modes
ServerInstance.__modes[mode.type] = cls
@classmethod
def make(
cls: typing.Type[Self],
mode: mode_specs.ProxyMode | str,
manager: ServerManager,
) -> Self:
if isinstance(mode, str):
mode = mode_specs.ProxyMode.parse(mode)
inst = ServerInstance.__modes[mode.type](mode, manager)
if not isinstance(inst, cls):
raise ValueError(f"{mode!r} is not a spec for a {cls.__name__} server.")
return inst
@property
@abstractmethod
def is_running(self) -> bool:
pass
@abstractmethod
async def start(self) -> None:
pass
@abstractmethod
async def stop(self) -> None:
pass
@property
@abstractmethod
def listen_addrs(self) -> tuple[Address, ...]:
pass
@abstractmethod
def make_top_layer(self, context: Context) -> Layer:
pass
def to_json(self) -> dict:
return {
"type": self.mode.type,
"description": self.mode.description,
"full_spec": self.mode.full_spec,
"is_running": self.is_running,
"last_exception": str(self.last_exception) if self.last_exception else None,
"listen_addrs": self.listen_addrs,
}
async def handle_tcp_connection(
self,
reader: asyncio.StreamReader | wg.TcpStream,
writer: asyncio.StreamWriter | wg.TcpStream,
) -> None:
handler = ProxyConnectionHandler(
ctx.master, reader, writer, ctx.options, self.mode
)
handler.layer = self.make_top_layer(handler.layer.context)
if isinstance(self.mode, mode_specs.TransparentMode):
s = cast(socket.socket, writer.get_extra_info("socket"))
try:
assert platform.original_addr
original_dst = platform.original_addr(s)
except Exception as e:
logger.error(f"Transparent mode failure: {e!r}")
return
else:
handler.layer.context.client.sockname = original_dst
handler.layer.context.server.address = original_dst
elif isinstance(self.mode, mode_specs.WireGuardMode):
original_dst = writer.get_extra_info("original_dst")
handler.layer.context.client.sockname = original_dst
handler.layer.context.server.address = original_dst
connection_id = (
handler.layer.context.client.transport_protocol,
handler.layer.context.client.peername,
handler.layer.context.client.sockname,
)
with self.manager.register_connection(connection_id, handler):
await handler.handle_client()
def handle_udp_datagram(
self,
transport: asyncio.DatagramTransport,
data: bytes,
remote_addr: Address,
local_addr: Address,
) -> None:
connection_id = ("udp", remote_addr, local_addr)
if connection_id not in self.manager.connections:
reader = udp.DatagramReader()
writer = udp.DatagramWriter(transport, remote_addr, reader)
handler = ProxyConnectionHandler(
ctx.master, reader, writer, ctx.options, self.mode
)
handler.timeout_watchdog.CONNECTION_TIMEOUT = 20
handler.layer = self.make_top_layer(handler.layer.context)
handler.layer.context.client.transport_protocol = "udp"
handler.layer.context.server.transport_protocol = "udp"
if isinstance(self.mode, mode_specs.WireGuardMode):
handler.layer.context.server.address = local_addr
# pre-register here - we may get datagrams before the task is executed.
self.manager.connections[connection_id] = handler
asyncio.create_task(self.handle_udp_connection(connection_id, handler))
else:
handler = self.manager.connections[connection_id]
reader = cast(udp.DatagramReader, handler.transports[handler.client].reader)
reader.feed_data(data, remote_addr)
async def handle_udp_connection(self, connection_id: tuple, handler: ProxyConnectionHandler) -> None:
with self.manager.register_connection(connection_id, handler):
await handler.handle_client()
class AsyncioServerInstance(ServerInstance[M], metaclass=ABCMeta):
_server: asyncio.Server | udp.UdpServer | None = None
_listen_addrs: tuple[Address, ...] = tuple()
@property
def is_running(self) -> bool:
return self._server is not None
async def start(self) -> None:
assert self._server is None
host = self.mode.listen_host(ctx.options.listen_host)
port = self.mode.listen_port(ctx.options.listen_port)
try:
self._server = await self.listen(host, port)
self._listen_addrs = tuple(s.getsockname() for s in self._server.sockets)
except OSError as e:
self.last_exception = e
message = f"{self.mode.description} failed to listen on {host or '*'}:{port} with {e}"
if e.errno == errno.EADDRINUSE and self.mode.custom_listen_port is None:
assert self.mode.custom_listen_host is None # since [@ [listen_addr:]listen_port]
message += f"\nTry specifying a different port by using `--mode {self.mode.full_spec}@{port + 1}`."
raise OSError(e.errno, message, e.filename) from e
except Exception as e:
self.last_exception = e
raise
else:
self.last_exception = None
addrs = " and ".join({human.format_address(a) for a in self._listen_addrs})
logger.info(f"{self.mode.description} listening at {addrs}.")
async def stop(self) -> None:
assert self._server is not None
# we always reset _server and _listen_addrs and ignore failures
server = self._server
listen_addrs = self._listen_addrs
self._server = None
self._listen_addrs = tuple()
try:
server.close()
await server.wait_closed()
except Exception as e:
self.last_exception = e
raise
else:
self.last_exception = None
addrs = " and ".join({human.format_address(a) for a in listen_addrs})
logger.info(f"Stopped {self.mode.description} at {addrs}.")
async def listen(self, host: str, port: int) -> asyncio.Server | udp.UdpServer:
if self.mode.transport_protocol == "tcp":
# workaround for https://github.com/python/cpython/issues/89856:
# We want both IPv4 and IPv6 sockets to bind to the same port.
# This may fail (https://github.com/mitmproxy/mitmproxy/pull/5542#issuecomment-1222803291),
# so we try to cover the 99% case and then give up and fall back to what asyncio does.
if port == 0:
try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(("", 0))
fixed_port = s.getsockname()[1]
s.close()
return await asyncio.start_server(self.handle_tcp_connection, host, fixed_port)
except Exception as e:
logger.debug(f"Failed to listen on a single port ({e!r}), falling back to default behavior.")
return await asyncio.start_server(self.handle_tcp_connection, host, port)
elif self.mode.transport_protocol == "udp":
# create_datagram_endpoint only creates one socket, so the workaround above doesn't apply
# NOTE once we do dual servers, we should consider creating sockets manually to ensure
# both TCP and UDP listen to the same IPs and same ports
return await udp.start_server(
self.handle_udp_datagram,
host,
port,
)
else:
raise AssertionError(self.mode.transport_protocol)
@property
def listen_addrs(self) -> tuple[Address, ...]:
return self._listen_addrs
class WireGuardServerInstance(ServerInstance[mode_specs.WireGuardMode]):
_server: wg.Server | None = None
_listen_addrs: tuple[Address, ...] = tuple()
server_key: str
client_key: str
def make_top_layer(self, context: Context) -> Layer:
return layers.modes.TransparentProxy(context)
@property
def is_running(self) -> bool:
return self._server is not None
async def start(self) -> None:
assert self._server is None
host = self.mode.listen_host(ctx.options.listen_host)
port = self.mode.listen_port(ctx.options.listen_port)
if self.mode.data:
conf_path = Path(self.mode.data).expanduser()
else:
conf_path = Path(ctx.options.confdir).expanduser() / "wireguard.conf"
try:
if not conf_path.exists():
conf_path.write_text(json.dumps({
"server_key": wg.genkey(),
"client_key": wg.genkey(),
}, indent=4))
try:
c = json.loads(conf_path.read_text())
self.server_key = c["server_key"]
self.client_key = c["client_key"]
except Exception as e:
raise ValueError(f"Invalid configuration file ({conf_path}): {e}") from e
# error early on invalid keys
p = wg.pubkey(self.client_key)
_ = wg.pubkey(self.server_key)
self._server = await wg.start_server(
host,
port,
self.server_key,
[p],
self.wg_handle_tcp_connection,
self.wg_handle_udp_datagram,
)
self._listen_addrs = (self._server.getsockname(),)
except Exception as e:
self.last_exception = e
message = f"{self.mode.description} failed to listen on {host or '*'}:{port} with {e}"
raise OSError(message) from e
else:
self.last_exception = None
addrs = " and ".join({human.format_address(a) for a in self.listen_addrs})
conf = self.client_conf()
assert conf
logger.info(
f"{self.mode.description} listening at {addrs}.\n"
+ "------------------------------------------------------------\n"
+ conf
+ "\n------------------------------------------------------------"
)
def client_conf(self) -> str | None:
if not self._server:
return None
host = local_ip.get_local_ip() or local_ip.get_local_ip6()
port = self.mode.listen_port(ctx.options.listen_port)
return textwrap.dedent(f"""
[Interface]
PrivateKey = {self.client_key}
Address = 10.0.0.1/32
DNS = 10.0.0.53
[Peer]
PublicKey = {wg.pubkey(self.server_key)}
AllowedIPs = 0.0.0.0/0
Endpoint = {host}:{port}
""").strip()
def to_json(self) -> dict:
return {
"wireguard_conf": self.client_conf(),
**super().to_json()
}
async def stop(self) -> None:
assert self._server is not None
self._server.close()
await self._server.wait_closed()
self._server = None
self.last_exception = None
addrs = " and ".join({human.format_address(a) for a in self.listen_addrs})
logger.info(f"Stopped {self.mode.description} at {addrs}.")
@property
def listen_addrs(self) -> tuple[Address, ...]:
return self._listen_addrs
async def wg_handle_tcp_connection(self, stream: wg.TcpStream) -> None:
await self.handle_tcp_connection(stream, stream)
def wg_handle_udp_datagram(self, data: bytes, remote_addr: Address, local_addr: Address) -> None:
assert self._server is not None
transport = WireGuardDatagramTransport(self._server, local_addr, remote_addr)
self.handle_udp_datagram(
transport,
data,
remote_addr,
local_addr
)
class RegularInstance(AsyncioServerInstance[mode_specs.RegularMode]):
def make_top_layer(self, context: Context) -> Layer:
return layers.modes.HttpProxy(context)
class UpstreamInstance(AsyncioServerInstance[mode_specs.UpstreamMode]):
def make_top_layer(self, context: Context) -> Layer:
return layers.modes.HttpUpstreamProxy(context)
class TransparentInstance(AsyncioServerInstance[mode_specs.TransparentMode]):
def make_top_layer(self, context: Context) -> Layer:
return layers.modes.TransparentProxy(context)
class ReverseInstance(AsyncioServerInstance[mode_specs.ReverseMode]):
def make_top_layer(self, context: Context) -> Layer:
return layers.modes.ReverseProxy(context)
class Socks5Instance(AsyncioServerInstance[mode_specs.Socks5Mode]):
def make_top_layer(self, context: Context) -> Layer:
return layers.modes.Socks5Proxy(context)
class DnsInstance(AsyncioServerInstance[mode_specs.DnsMode]):
def make_top_layer(self, context: Context) -> Layer:
return layers.DNSLayer(context)