164 lines
4.9 KiB
Python
164 lines
4.9 KiB
Python
from __future__ import absolute_import
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from netlib import socks
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class ProxyError(Exception):
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def __init__(self, code, message, headers=None):
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super(ProxyError, self).__init__(message)
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self.code, self.headers = code, headers
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class ProxyServerError(Exception):
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pass
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class ProxyMode(object):
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http_form_in = None
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http_form_out = None
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def get_upstream_server(self, client_conn):
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"""
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Returns the address of the server to connect to.
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Returns None if the address needs to be determined on the protocol level (regular proxy mode)
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"""
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raise NotImplementedError() # pragma: nocover
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@property
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def name(self):
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return self.__class__.__name__.replace("ProxyMode", "").lower()
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def __str__(self):
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return self.name
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def __eq__(self, other):
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"""
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Allow comparisions with "regular" etc.
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"""
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if isinstance(other, ProxyMode):
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return self is other
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else:
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return self.name == other
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def __ne__(self, other):
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return not self.__eq__(other)
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class RegularProxyMode(ProxyMode):
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http_form_in = "absolute"
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http_form_out = "relative"
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def get_upstream_server(self, client_conn):
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return None
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class TransparentProxyMode(ProxyMode):
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http_form_in = "relative"
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http_form_out = "relative"
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def __init__(self, resolver, sslports):
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self.resolver = resolver
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self.sslports = sslports
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def get_upstream_server(self, client_conn):
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try:
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dst = self.resolver.original_addr(client_conn.connection)
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except Exception, e:
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raise ProxyError(502, "Transparent mode failure: %s" % str(e))
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if dst[1] in self.sslports:
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ssl = True
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else:
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ssl = False
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return [ssl, ssl] + list(dst)
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class Socks5ProxyMode(ProxyMode):
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http_form_in = "relative"
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http_form_out = "relative"
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def __init__(self, sslports):
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self.sslports = sslports
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@staticmethod
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def _assert_socks5(msg):
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if msg.ver != socks.VERSION.SOCKS5:
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if msg.ver == ord("G") and len(msg.methods) == ord("E"):
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guess = "Probably not a SOCKS request but a regular HTTP request. "
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else:
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guess = ""
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raise socks.SocksError(
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socks.REP.GENERAL_SOCKS_SERVER_FAILURE,
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guess + "Invalid SOCKS version. Expected 0x05, got 0x%x" % msg.ver)
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def get_upstream_server(self, client_conn):
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try:
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# Parse Client Greeting
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client_greet = socks.ClientGreeting.from_file(client_conn.rfile)
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self._assert_socks5(client_greet)
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if socks.METHOD.NO_AUTHENTICATION_REQUIRED not in client_greet.methods:
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raise socks.SocksError(
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socks.METHOD.NO_ACCEPTABLE_METHODS,
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"mitmproxy only supports SOCKS without authentication"
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)
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# Send Server Greeting
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server_greet = socks.ServerGreeting(
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socks.VERSION.SOCKS5,
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socks.METHOD.NO_AUTHENTICATION_REQUIRED
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)
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server_greet.to_file(client_conn.wfile)
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client_conn.wfile.flush()
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# Parse Connect Request
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connect_request = socks.Message.from_file(client_conn.rfile)
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self._assert_socks5(connect_request)
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if connect_request.msg != socks.CMD.CONNECT:
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raise socks.SocksError(
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socks.REP.COMMAND_NOT_SUPPORTED,
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"mitmproxy only supports SOCKS5 CONNECT."
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)
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# We do not connect here yet, as the clientconnect event has not been handled yet.
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connect_reply = socks.Message(
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socks.VERSION.SOCKS5,
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socks.REP.SUCCEEDED,
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socks.ATYP.DOMAINNAME,
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client_conn.address # dummy value, we don't have an upstream connection yet.
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)
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connect_reply.to_file(client_conn.wfile)
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client_conn.wfile.flush()
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ssl = bool(connect_request.addr.port in self.sslports)
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return ssl, ssl, connect_request.addr.host, connect_request.addr.port
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except socks.SocksError as e:
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msg = socks.Message(5, e.code, socks.ATYP.DOMAINNAME, repr(e))
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try:
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msg.to_file(client_conn.wfile)
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except:
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pass
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raise ProxyError(502, "SOCKS5 mode failure: %s" % str(e))
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class _ConstDestinationProxyMode(ProxyMode):
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def __init__(self, dst):
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self.dst = dst
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def get_upstream_server(self, client_conn):
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return self.dst
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class ReverseProxyMode(_ConstDestinationProxyMode):
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http_form_in = "relative"
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http_form_out = "relative"
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class UpstreamProxyMode(_ConstDestinationProxyMode):
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http_form_in = "absolute"
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http_form_out = "absolute"
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class Log:
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def __init__(self, msg, level="info"):
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self.msg = msg
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self.level = level |