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
|
#!/usr/bin/env python3
# Copyright (c) 2015-2019 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Dummy Socks5 server for testing."""
import socket
import threading
import queue
import logging
logger = logging.getLogger("TestFramework.socks5")
# Protocol constants
class Command:
CONNECT = 0x01
class AddressType:
IPV4 = 0x01
DOMAINNAME = 0x03
IPV6 = 0x04
# Utility functions
def recvall(s, n):
"""Receive n bytes from a socket, or fail."""
rv = bytearray()
while n > 0:
d = s.recv(n)
if not d:
raise IOError('Unexpected end of stream')
rv.extend(d)
n -= len(d)
return rv
# Implementation classes
class Socks5Configuration():
"""Proxy configuration."""
def __init__(self):
self.addr = None # Bind address (must be set)
self.af = socket.AF_INET # Bind address family
self.unauth = False # Support unauthenticated
self.auth = False # Support authentication
class Socks5Command():
"""Information about an incoming socks5 command."""
def __init__(self, cmd, atyp, addr, port, username, password):
self.cmd = cmd # Command (one of Command.*)
self.atyp = atyp # Address type (one of AddressType.*)
self.addr = addr # Address
self.port = port # Port to connect to
self.username = username
self.password = password
def __repr__(self):
return 'Socks5Command(%s,%s,%s,%s,%s,%s)' % (self.cmd, self.atyp, self.addr, self.port, self.username, self.password)
class Socks5Connection():
def __init__(self, serv, conn):
self.serv = serv
self.conn = conn
def handle(self):
"""Handle socks5 request according to RFC192."""
try:
# Verify socks version
ver = recvall(self.conn, 1)[0]
if ver != 0x05:
raise IOError('Invalid socks version %i' % ver)
# Choose authentication method
nmethods = recvall(self.conn, 1)[0]
methods = bytearray(recvall(self.conn, nmethods))
method = None
if 0x02 in methods and self.serv.conf.auth:
method = 0x02 # username/password
elif 0x00 in methods and self.serv.conf.unauth:
method = 0x00 # unauthenticated
if method is None:
raise IOError('No supported authentication method was offered')
# Send response
self.conn.sendall(bytearray([0x05, method]))
# Read authentication (optional)
username = None
password = None
if method == 0x02:
ver = recvall(self.conn, 1)[0]
if ver != 0x01:
raise IOError('Invalid auth packet version %i' % ver)
ulen = recvall(self.conn, 1)[0]
username = str(recvall(self.conn, ulen))
plen = recvall(self.conn, 1)[0]
password = str(recvall(self.conn, plen))
# Send authentication response
self.conn.sendall(bytearray([0x01, 0x00]))
# Read connect request
ver, cmd, _, atyp = recvall(self.conn, 4)
if ver != 0x05:
raise IOError('Invalid socks version %i in connect request' % ver)
if cmd != Command.CONNECT:
raise IOError('Unhandled command %i in connect request' % cmd)
if atyp == AddressType.IPV4:
addr = recvall(self.conn, 4)
elif atyp == AddressType.DOMAINNAME:
n = recvall(self.conn, 1)[0]
addr = recvall(self.conn, n)
elif atyp == AddressType.IPV6:
addr = recvall(self.conn, 16)
else:
raise IOError('Unknown address type %i' % atyp)
port_hi,port_lo = recvall(self.conn, 2)
port = (port_hi << 8) | port_lo
# Send dummy response
self.conn.sendall(bytearray([0x05, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]))
cmdin = Socks5Command(cmd, atyp, addr, port, username, password)
self.serv.queue.put(cmdin)
logger.info('Proxy: %s', cmdin)
# Fall through to disconnect
except Exception as e:
logger.exception("socks5 request handling failed.")
self.serv.queue.put(e)
finally:
self.conn.close()
class Socks5Server():
def __init__(self, conf):
self.conf = conf
self.s = socket.socket(conf.af)
self.s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.s.bind(conf.addr)
self.s.listen(5)
self.running = False
self.thread = None
self.queue = queue.Queue() # report connections and exceptions to client
def run(self):
while self.running:
(sockconn, _) = self.s.accept()
if self.running:
conn = Socks5Connection(self, sockconn)
thread = threading.Thread(None, conn.handle)
thread.daemon = True
thread.start()
def start(self):
assert not self.running
self.running = True
self.thread = threading.Thread(None, self.run)
self.thread.daemon = True
self.thread.start()
def stop(self):
self.running = False
# connect to self to end run loop
s = socket.socket(self.conf.af)
s.connect(self.conf.addr)
s.close()
self.thread.join()
|
