/usr/lib/python2.7/dist-packages/netlib/socks.py is in python-netlib 0.15.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 | from __future__ import (absolute_import, print_function, division)
import struct
import array
import ipaddress
from . import tcp, utils
class SocksError(Exception):
def __init__(self, code, message):
super(SocksError, self).__init__(message)
self.code = code
VERSION = utils.BiDi(
SOCKS4=0x04,
SOCKS5=0x05
)
CMD = utils.BiDi(
CONNECT=0x01,
BIND=0x02,
UDP_ASSOCIATE=0x03
)
ATYP = utils.BiDi(
IPV4_ADDRESS=0x01,
DOMAINNAME=0x03,
IPV6_ADDRESS=0x04
)
REP = utils.BiDi(
SUCCEEDED=0x00,
GENERAL_SOCKS_SERVER_FAILURE=0x01,
CONNECTION_NOT_ALLOWED_BY_RULESET=0x02,
NETWORK_UNREACHABLE=0x03,
HOST_UNREACHABLE=0x04,
CONNECTION_REFUSED=0x05,
TTL_EXPIRED=0x06,
COMMAND_NOT_SUPPORTED=0x07,
ADDRESS_TYPE_NOT_SUPPORTED=0x08,
)
METHOD = utils.BiDi(
NO_AUTHENTICATION_REQUIRED=0x00,
GSSAPI=0x01,
USERNAME_PASSWORD=0x02,
NO_ACCEPTABLE_METHODS=0xFF
)
class ClientGreeting(object):
__slots__ = ("ver", "methods")
def __init__(self, ver, methods):
self.ver = ver
self.methods = array.array("B")
self.methods.extend(methods)
def assert_socks5(self):
if self.ver != VERSION.SOCKS5:
if self.ver == ord("G") and len(self.methods) == ord("E"):
guess = "Probably not a SOCKS request but a regular HTTP request. "
else:
guess = ""
raise SocksError(
REP.GENERAL_SOCKS_SERVER_FAILURE,
guess + "Invalid SOCKS version. Expected 0x05, got 0x%x" % self.ver
)
@classmethod
def from_file(cls, f, fail_early=False):
"""
:param fail_early: If true, a SocksError will be raised if the first byte does not indicate socks5.
"""
ver, nmethods = struct.unpack("!BB", f.safe_read(2))
client_greeting = cls(ver, [])
if fail_early:
client_greeting.assert_socks5()
client_greeting.methods.fromstring(f.safe_read(nmethods))
return client_greeting
def to_file(self, f):
f.write(struct.pack("!BB", self.ver, len(self.methods)))
f.write(self.methods.tostring())
class ServerGreeting(object):
__slots__ = ("ver", "method")
def __init__(self, ver, method):
self.ver = ver
self.method = method
def assert_socks5(self):
if self.ver != VERSION.SOCKS5:
if self.ver == ord("H") and self.method == ord("T"):
guess = "Probably not a SOCKS request but a regular HTTP response. "
else:
guess = ""
raise SocksError(
REP.GENERAL_SOCKS_SERVER_FAILURE,
guess + "Invalid SOCKS version. Expected 0x05, got 0x%x" % self.ver
)
@classmethod
def from_file(cls, f):
ver, method = struct.unpack("!BB", f.safe_read(2))
return cls(ver, method)
def to_file(self, f):
f.write(struct.pack("!BB", self.ver, self.method))
class Message(object):
__slots__ = ("ver", "msg", "atyp", "addr")
def __init__(self, ver, msg, atyp, addr):
self.ver = ver
self.msg = msg
self.atyp = atyp
self.addr = tcp.Address.wrap(addr)
def assert_socks5(self):
if self.ver != VERSION.SOCKS5:
raise SocksError(
REP.GENERAL_SOCKS_SERVER_FAILURE,
"Invalid SOCKS version. Expected 0x05, got 0x%x" % self.ver
)
@classmethod
def from_file(cls, f):
ver, msg, rsv, atyp = struct.unpack("!BBBB", f.safe_read(4))
if rsv != 0x00:
raise SocksError(
REP.GENERAL_SOCKS_SERVER_FAILURE,
"Socks Request: Invalid reserved byte: %s" % rsv
)
if atyp == ATYP.IPV4_ADDRESS:
# We use tnoa here as ntop is not commonly available on Windows.
host = ipaddress.IPv4Address(f.safe_read(4)).compressed
use_ipv6 = False
elif atyp == ATYP.IPV6_ADDRESS:
host = ipaddress.IPv6Address(f.safe_read(16)).compressed
use_ipv6 = True
elif atyp == ATYP.DOMAINNAME:
length, = struct.unpack("!B", f.safe_read(1))
host = f.safe_read(length)
if not utils.is_valid_host(host):
raise SocksError(REP.GENERAL_SOCKS_SERVER_FAILURE, "Invalid hostname: %s" % host)
host = host.decode("idna")
use_ipv6 = False
else:
raise SocksError(REP.ADDRESS_TYPE_NOT_SUPPORTED,
"Socks Request: Unknown ATYP: %s" % atyp)
port, = struct.unpack("!H", f.safe_read(2))
addr = tcp.Address((host, port), use_ipv6=use_ipv6)
return cls(ver, msg, atyp, addr)
def to_file(self, f):
f.write(struct.pack("!BBBB", self.ver, self.msg, 0x00, self.atyp))
if self.atyp == ATYP.IPV4_ADDRESS:
f.write(ipaddress.IPv4Address(self.addr.host).packed)
elif self.atyp == ATYP.IPV6_ADDRESS:
f.write(ipaddress.IPv6Address(self.addr.host).packed)
elif self.atyp == ATYP.DOMAINNAME:
f.write(struct.pack("!B", len(self.addr.host)))
f.write(self.addr.host.encode("idna"))
else:
raise SocksError(
REP.ADDRESS_TYPE_NOT_SUPPORTED,
"Unknown ATYP: %s" % self.atyp
)
f.write(struct.pack("!H", self.addr.port))
|