1 | #!/usr/bin/env python |
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2 | # -*- coding: utf-8 -*- |
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3 | # |
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4 | # Ethernet over WebSocket tunneling server/client |
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5 | # |
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6 | # depends on: |
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7 | # - python-2.7.2 |
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8 | # - python-pytun-0.2 |
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9 | # - websocket-client-0.7.0 |
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10 | # - tornado-2.2.1 |
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11 | # |
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12 | # todo: |
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13 | # - servant mode support (like typical p2p software) |
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14 | # |
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15 | # =========================================================================== |
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16 | # Copyright (c) 2012, Atzm WATANABE <atzm@atzm.org> |
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17 | # All rights reserved. |
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18 | # |
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19 | # Redistribution and use in source and binary forms, with or without |
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20 | # modification, are permitted provided that the following conditions are met: |
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21 | # |
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22 | # 1. Redistributions of source code must retain the above copyright notice, |
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23 | # this list of conditions and the following disclaimer. |
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24 | # 2. Redistributions in binary form must reproduce the above copyright |
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25 | # notice, this list of conditions and the following disclaimer in the |
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26 | # documentation and/or other materials provided with the distribution. |
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27 | # |
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28 | # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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29 | # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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30 | # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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31 | # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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32 | # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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33 | # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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34 | # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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35 | # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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36 | # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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37 | # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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38 | # POSSIBILITY OF SUCH DAMAGE. |
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39 | # =========================================================================== |
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40 | # |
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41 | # $Id$ |
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42 | |
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43 | import os |
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44 | import sys |
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45 | import ssl |
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46 | import time |
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47 | import base64 |
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48 | import hashlib |
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49 | import getpass |
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50 | import argparse |
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51 | import threading |
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52 | |
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53 | import pytun |
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54 | import websocket |
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55 | import tornado.web |
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56 | import tornado.ioloop |
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57 | import tornado.websocket |
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58 | import tornado.httpserver |
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59 | |
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60 | |
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61 | class DebugMixIn(object): |
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62 | def dprintf(self, msg, *args): |
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63 | if self._debug: |
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64 | prefix = '[%s] %s - ' % (time.asctime(), self.__class__.__name__) |
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65 | sys.stderr.write(prefix + (msg % args)) |
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66 | |
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67 | |
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68 | class TapHandler(DebugMixIn): |
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69 | READ_SIZE = 65535 |
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70 | |
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71 | def __init__(self, dev, debug=False): |
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72 | self._debug = debug |
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73 | self._clients = [] |
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74 | self._tap = pytun.TunTapDevice(dev, pytun.IFF_TAP | pytun.IFF_NO_PI) |
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75 | self._tap.up() |
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76 | self._taplock = threading.Lock() |
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77 | |
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78 | def fileno(self): |
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79 | with self._taplock: |
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80 | return self._tap.fileno() |
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81 | |
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82 | def register_client(self, client): |
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83 | self._clients.append(client) |
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84 | |
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85 | def unregister_client(self, client): |
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86 | self._clients.remove(client) |
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87 | |
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88 | def write(self, caller, message): |
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89 | clients = self._clients[:] |
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90 | |
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91 | if caller is not self: |
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92 | clients.remove(caller) |
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93 | |
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94 | with self._taplock: |
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95 | self._tap.write(message) |
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96 | |
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97 | for c in clients: |
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98 | c.write_message(message, True) |
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99 | |
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100 | def __call__(self, fd, events): |
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101 | buf = [] |
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102 | |
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103 | while True: |
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104 | with self._taplock: |
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105 | data = self._tap.read(self.READ_SIZE) |
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106 | |
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107 | if data: |
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108 | buf.append(data) |
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109 | |
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110 | if len(data) < self.READ_SIZE: |
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111 | break |
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112 | |
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113 | self.write(self, ''.join(buf)) |
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114 | |
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115 | |
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116 | class EtherWebSocketHandler(tornado.websocket.WebSocketHandler, DebugMixIn): |
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117 | def __init__(self, app, req, tap, debug=False): |
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118 | super(EtherWebSocketHandler, self).__init__(app, req) |
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119 | self._tap = tap |
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120 | self._debug = debug |
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121 | |
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122 | def open(self): |
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123 | self._tap.register_client(self) |
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124 | self.dprintf('connected: %s\n', self.request.remote_ip) |
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125 | |
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126 | def on_message(self, message): |
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127 | self._tap.write(self, message) |
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128 | self.dprintf('received: %s %s\n', |
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129 | self.request.remote_ip, message.encode('hex')) |
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130 | |
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131 | def on_close(self): |
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132 | self._tap.unregister_client(self) |
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133 | self.dprintf('disconnected: %s\n', self.request.remote_ip) |
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134 | |
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135 | |
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136 | class EtherWebSocketClient(DebugMixIn): |
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137 | def __init__(self, tap, url, user=None, passwd=None, debug=False): |
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138 | self._sock = None |
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139 | self._tap = tap |
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140 | self._url = url |
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141 | self._debug = debug |
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142 | self._options = {} |
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143 | |
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144 | if user and passwd: |
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145 | token = base64.b64encode('%s:%s' % (user, passwd)) |
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146 | auth = ['Authorization: Basic %s' % token] |
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147 | self._options['header'] = auth |
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148 | |
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149 | @property |
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150 | def closed(self): |
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151 | return not self._sock |
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152 | |
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153 | def open(self): |
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154 | if not self.closed: |
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155 | raise websocket.WebSocketException('already opened') |
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156 | self._sock = websocket.WebSocket() |
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157 | self._sock.connect(self._url, **self._options) |
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158 | self.dprintf('connected: %s\n', self._url) |
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159 | |
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160 | def close(self): |
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161 | if self.closed: |
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162 | raise websocket.WebSocketException('already closed') |
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163 | self._sock.close() |
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164 | self._sock = None |
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165 | self.dprintf('disconnected: %s\n', self._url) |
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166 | |
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167 | def write_message(self, message, binary=False): |
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168 | if self.closed: |
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169 | raise websocket.WebSocketException('closed socket') |
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170 | if binary: |
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171 | flag = websocket.ABNF.OPCODE_BINARY |
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172 | else: |
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173 | flag = websocket.ABNF.OPCODE_TEXT |
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174 | self._sock.send(message, flag) |
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175 | self.dprintf('sent: %s %s\n', self._url, message.encode('hex')) |
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176 | |
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177 | def run_forever(self): |
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178 | try: |
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179 | if self.closed: |
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180 | self.open() |
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181 | while True: |
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182 | data = self._sock.recv() |
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183 | if data is None: |
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184 | break |
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185 | self._tap.write(self, data) |
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186 | finally: |
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187 | self.close() |
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188 | |
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189 | |
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190 | def daemonize(nochdir=False, noclose=False): |
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191 | if os.fork() > 0: |
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192 | sys.exit(0) |
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193 | |
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194 | os.setsid() |
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195 | |
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196 | if os.fork() > 0: |
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197 | sys.exit(0) |
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198 | |
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199 | if not nochdir: |
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200 | os.chdir('/') |
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201 | |
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202 | if not noclose: |
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203 | os.umask(0) |
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204 | sys.stdin.close() |
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205 | sys.stdout.close() |
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206 | sys.stderr.close() |
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207 | os.close(0) |
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208 | os.close(1) |
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209 | os.close(2) |
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210 | sys.stdin = open(os.devnull) |
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211 | sys.stdout = open(os.devnull, 'a') |
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212 | sys.stderr = open(os.devnull, 'a') |
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213 | |
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214 | |
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215 | def realpath(ns, *keys): |
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216 | for k in keys: |
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217 | v = getattr(ns, k, None) |
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218 | if v is not None: |
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219 | v = os.path.realpath(v) |
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220 | setattr(ns, k, v) |
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221 | open(v).close() # check readable |
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222 | return ns |
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223 | |
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224 | |
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225 | def server_main(args): |
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226 | def wrap_basic_auth(cls, users): |
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227 | o_exec = cls._execute |
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228 | |
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229 | if not users: |
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230 | return cls |
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231 | |
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232 | def execute(self, transforms, *args, **kwargs): |
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233 | def auth_required(): |
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234 | self.stream.write(tornado.escape.utf8( |
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235 | 'HTTP/1.1 401 Authorization Required\r\n' |
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236 | 'WWW-Authenticate: Basic realm=etherws\r\n\r\n' |
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237 | )) |
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238 | self.stream.close() |
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239 | |
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240 | creds = self.request.headers.get('Authorization') |
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241 | |
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242 | if not creds or not creds.startswith('Basic '): |
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243 | return auth_required() |
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244 | |
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245 | try: |
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246 | name, passwd = base64.b64decode(creds[6:]).split(':', 1) |
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247 | passwd = base64.b64encode(hashlib.sha1(passwd).digest()) |
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248 | |
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249 | if name not in users or users[name] != passwd: |
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250 | return auth_required() |
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251 | |
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252 | return o_exec(self, transforms, *args, **kwargs) |
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253 | |
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254 | except: |
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255 | return auth_required() |
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256 | |
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257 | cls._execute = execute |
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258 | return cls |
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259 | |
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260 | def load_htpasswd(path): |
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261 | users = {} |
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262 | try: |
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263 | with open(path) as fp: |
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264 | for line in fp: |
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265 | line = line.strip() |
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266 | if 0 <= line.find(':'): |
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267 | name, passwd = line.split(':', 1) |
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268 | if passwd.startswith('{SHA}'): |
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269 | users[name] = passwd[5:] |
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270 | if not users: |
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271 | raise ValueError('no valid users found') |
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272 | except TypeError: |
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273 | pass |
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274 | return users |
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275 | |
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276 | realpath(args, 'keyfile', 'certfile', 'htpasswd') |
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277 | |
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278 | if args.keyfile and args.certfile: |
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279 | ssl_options = {'keyfile': args.keyfile, 'certfile': args.certfile} |
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280 | elif args.keyfile or args.certfile: |
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281 | raise ValueError('both keyfile and certfile are required') |
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282 | else: |
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283 | ssl_options = None |
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284 | |
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285 | if args.port is None: |
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286 | if ssl_options: |
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287 | args.port = 443 |
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288 | else: |
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289 | args.port = 80 |
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290 | elif not (0 <= args.port <= 65535): |
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291 | raise ValueError('invalid port: %s' % args.port) |
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292 | |
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293 | handler = wrap_basic_auth(EtherWebSocketHandler, |
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294 | load_htpasswd(args.htpasswd)) |
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295 | |
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296 | tap = TapHandler(args.device, debug=args.debug) |
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297 | app = tornado.web.Application([ |
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298 | (args.path, handler, {'tap': tap, 'debug': args.debug}), |
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299 | ]) |
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300 | server = tornado.httpserver.HTTPServer(app, ssl_options=ssl_options) |
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301 | server.listen(args.port, address=args.address) |
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302 | |
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303 | ioloop = tornado.ioloop.IOLoop.instance() |
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304 | ioloop.add_handler(tap.fileno(), tap, ioloop.READ) |
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305 | |
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306 | if not args.foreground: |
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307 | daemonize() |
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308 | |
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309 | ioloop.start() |
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310 | |
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311 | |
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312 | def client_main(args): |
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313 | realpath(args, 'cacerts') |
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314 | |
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315 | if args.debug: |
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316 | websocket.enableTrace(True) |
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317 | |
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318 | if not args.insecure: |
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319 | websocket._SSLSocketWrapper = \ |
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320 | lambda s: ssl.wrap_socket(s, cert_reqs=ssl.CERT_REQUIRED, |
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321 | ca_certs=args.cacerts) |
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322 | |
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323 | if args.user and args.passwd is None: |
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324 | args.passwd = getpass.getpass() |
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325 | |
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326 | tap = TapHandler(args.device, debug=args.debug) |
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327 | client = EtherWebSocketClient(tap, args.uri, |
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328 | args.user, args.passwd, args.debug) |
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329 | |
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330 | tap.register_client(client) |
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331 | client.open() |
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332 | |
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333 | ioloop = tornado.ioloop.IOLoop.instance() |
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334 | ioloop.add_handler(tap.fileno(), tap, ioloop.READ) |
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335 | |
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336 | t = threading.Thread(target=ioloop.start) |
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337 | t.setDaemon(True) |
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338 | |
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339 | if not args.foreground: |
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340 | daemonize() |
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341 | |
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342 | t.start() |
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343 | client.run_forever() |
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344 | |
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345 | |
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346 | def main(): |
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347 | parser = argparse.ArgumentParser() |
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348 | parser.add_argument('--device', action='store', default='ethws%d') |
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349 | parser.add_argument('--foreground', action='store_true', default=False) |
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350 | parser.add_argument('--debug', action='store_true', default=False) |
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351 | |
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352 | subparsers = parser.add_subparsers(dest='subcommand') |
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353 | |
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354 | parser_s = subparsers.add_parser('server') |
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355 | parser_s.add_argument('--address', action='store', default='') |
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356 | parser_s.add_argument('--port', action='store', type=int) |
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357 | parser_s.add_argument('--path', action='store', default='/') |
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358 | parser_s.add_argument('--htpasswd', action='store') |
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359 | parser_s.add_argument('--keyfile', action='store') |
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360 | parser_s.add_argument('--certfile', action='store') |
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361 | |
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362 | parser_c = subparsers.add_parser('client') |
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363 | parser_c.add_argument('--uri', action='store', required=True) |
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364 | parser_c.add_argument('--insecure', action='store_true', default=False) |
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365 | parser_c.add_argument('--cacerts', action='store') |
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366 | parser_c.add_argument('--user', action='store') |
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367 | parser_c.add_argument('--passwd', action='store') |
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368 | |
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369 | args = parser.parse_args() |
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370 | |
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371 | if args.subcommand == 'server': |
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372 | server_main(args) |
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373 | elif args.subcommand == 'client': |
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374 | client_main(args) |
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375 | |
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376 | |
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377 | if __name__ == '__main__': |
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378 | main() |
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