[133] | 1 | #!/usr/bin/env python |
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| 2 | # -*- coding: utf-8 -*- |
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| 3 | # |
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[141] | 4 | # Ethernet over WebSocket tunneling server/client |
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[133] | 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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[136] | 9 | # - websocket-client-0.7.0 |
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| 10 | # - tornado-2.2.1 |
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[133] | 11 | # |
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[140] | 12 | # todo: |
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[143] | 13 | # - servant mode support (like typical p2p software) |
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[140] | 14 | # |
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[133] | 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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[156] | 45 | import ssl |
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[160] | 46 | import time |
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[150] | 47 | import base64 |
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| 48 | import hashlib |
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[151] | 49 | import getpass |
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[133] | 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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[160] | 55 | import tornado.web |
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[133] | 56 | import tornado.ioloop |
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| 57 | import tornado.websocket |
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[160] | 58 | import tornado.httpserver |
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[133] | 59 | |
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| 60 | |
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[160] | 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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[133] | 69 | def __init__(self, dev, debug=False): |
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| 70 | self._debug = debug |
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[138] | 71 | self._clients = [] |
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[133] | 72 | self._tap = pytun.TunTapDevice(dev, pytun.IFF_TAP | pytun.IFF_NO_PI) |
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[138] | 73 | self._tap.up() |
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[160] | 74 | self._glock = threading.Lock() |
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[133] | 75 | |
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[138] | 76 | def fileno(self): |
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[160] | 77 | with self._glock: |
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| 78 | return self._tap.fileno() |
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[133] | 79 | |
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| 80 | def register_client(self, client): |
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[160] | 81 | with self._glock: |
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| 82 | self._clients.append(client) |
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[133] | 83 | |
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| 84 | def unregister_client(self, client): |
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[160] | 85 | with self._glock: |
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| 86 | self._clients.remove(client) |
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[133] | 87 | |
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| 88 | def write(self, caller, message): |
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[160] | 89 | with self._glock: |
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[133] | 90 | clients = self._clients[:] |
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| 91 | |
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[137] | 92 | if caller is not self: |
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| 93 | clients.remove(caller) |
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[138] | 94 | self._tap.write(message) |
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[133] | 95 | |
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[137] | 96 | for c in clients: |
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[139] | 97 | c.write_message(message, True) |
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[133] | 98 | |
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[138] | 99 | def __call__(self, fd, events): |
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[160] | 100 | with self._glock: |
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| 101 | data = self._tap.read(self._tap.mtu) |
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| 102 | self.write(self, data) |
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[133] | 103 | |
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[135] | 104 | |
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[160] | 105 | class EtherWebSocketHandler(tornado.websocket.WebSocketHandler, DebugMixIn): |
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[133] | 106 | def __init__(self, app, req, tap, debug=False): |
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[160] | 107 | super(EtherWebSocketHandler, self).__init__(app, req) |
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[133] | 108 | self._tap = tap |
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| 109 | self._debug = debug |
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| 110 | |
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| 111 | def open(self): |
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| 112 | self._tap.register_client(self) |
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[160] | 113 | self.dprintf('connected: %s\n', self.request.remote_ip) |
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[133] | 114 | |
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| 115 | def on_message(self, message): |
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[139] | 116 | self._tap.write(self, message) |
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[160] | 117 | self.dprintf('received: %s %s\n', |
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| 118 | self.request.remote_ip, message.encode('hex')) |
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[133] | 119 | |
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| 120 | def on_close(self): |
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| 121 | self._tap.unregister_client(self) |
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[160] | 122 | self.dprintf('disconnected: %s\n', self.request.remote_ip) |
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[133] | 123 | |
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| 124 | |
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[160] | 125 | class EtherWebSocketClient(DebugMixIn): |
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| 126 | def __init__(self, tap, url, user=None, passwd=None, debug=False): |
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[151] | 127 | self._sock = None |
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| 128 | self._tap = tap |
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| 129 | self._url = url |
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[160] | 130 | self._debug = debug |
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[151] | 131 | self._options = {} |
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| 132 | |
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| 133 | if user and passwd: |
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| 134 | token = base64.b64encode('%s:%s' % (user, passwd)) |
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| 135 | auth = ['Authorization: Basic %s' % token] |
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| 136 | self._options['header'] = auth |
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| 137 | |
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[160] | 138 | @property |
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| 139 | def closed(self): |
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| 140 | return not self._sock |
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| 141 | |
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[151] | 142 | def open(self): |
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[160] | 143 | if not self.closed: |
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| 144 | raise websocket.WebSocketException('already opened') |
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[151] | 145 | self._sock = websocket.WebSocket() |
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| 146 | self._sock.connect(self._url, **self._options) |
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[160] | 147 | self.dprintf('connected: %s\n', self._url) |
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[151] | 148 | |
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| 149 | def close(self): |
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[160] | 150 | if self.closed: |
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| 151 | raise websocket.WebSocketException('already closed') |
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[151] | 152 | self._sock.close() |
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| 153 | self._sock = None |
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[160] | 154 | self.dprintf('disconnected: %s\n', self._url) |
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[151] | 155 | |
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| 156 | def write_message(self, message, binary=False): |
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[160] | 157 | if self.closed: |
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| 158 | raise websocket.WebSocketException('closed socket') |
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[151] | 159 | if binary: |
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| 160 | flag = websocket.ABNF.OPCODE_BINARY |
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[160] | 161 | else: |
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| 162 | flag = websocket.ABNF.OPCODE_TEXT |
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[151] | 163 | self._sock.send(message, flag) |
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[160] | 164 | self.dprintf('sent: %s %s\n', self._url, message.encode('hex')) |
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[151] | 165 | |
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| 166 | def run_forever(self): |
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| 167 | try: |
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[160] | 168 | if self.closed: |
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[151] | 169 | self.open() |
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| 170 | while True: |
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| 171 | data = self._sock.recv() |
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| 172 | if data is None: |
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| 173 | break |
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| 174 | self._tap.write(self, data) |
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| 175 | finally: |
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| 176 | self.close() |
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| 177 | |
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| 178 | |
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[134] | 179 | def daemonize(nochdir=False, noclose=False): |
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| 180 | if os.fork() > 0: |
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| 181 | sys.exit(0) |
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| 182 | |
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| 183 | os.setsid() |
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| 184 | |
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| 185 | if os.fork() > 0: |
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| 186 | sys.exit(0) |
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| 187 | |
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| 188 | if not nochdir: |
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| 189 | os.chdir('/') |
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| 190 | |
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| 191 | if not noclose: |
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| 192 | os.umask(0) |
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| 193 | sys.stdin.close() |
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| 194 | sys.stdout.close() |
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| 195 | sys.stderr.close() |
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| 196 | os.close(0) |
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| 197 | os.close(1) |
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| 198 | os.close(2) |
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| 199 | sys.stdin = open(os.devnull) |
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| 200 | sys.stdout = open(os.devnull, 'a') |
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| 201 | sys.stderr = open(os.devnull, 'a') |
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| 202 | |
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| 203 | |
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[160] | 204 | def realpath(ns, *keys): |
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| 205 | for k in keys: |
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| 206 | v = getattr(ns, k, None) |
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| 207 | if v is not None: |
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| 208 | v = os.path.realpath(v) |
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| 209 | setattr(ns, k, v) |
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| 210 | open(v).close() # check readable |
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| 211 | return ns |
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| 212 | |
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| 213 | |
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[133] | 214 | def server_main(args): |
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[160] | 215 | def wrap_basic_auth(cls, users): |
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| 216 | o_exec = cls._execute |
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| 217 | |
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[150] | 218 | if not users: |
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| 219 | return cls |
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| 220 | |
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[160] | 221 | def execute(self, transforms, *args, **kwargs): |
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[150] | 222 | def auth_required(): |
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| 223 | self.stream.write(tornado.escape.utf8( |
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| 224 | 'HTTP/1.1 401 Authorization Required\r\n' |
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| 225 | 'WWW-Authenticate: Basic realm=etherws\r\n\r\n' |
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| 226 | )) |
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| 227 | self.stream.close() |
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| 228 | |
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[160] | 229 | creds = self.request.headers.get('Authorization') |
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[150] | 230 | |
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[160] | 231 | if not creds or not creds.startswith('Basic '): |
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| 232 | return auth_required() |
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[150] | 233 | |
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[160] | 234 | try: |
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| 235 | name, passwd = base64.b64decode(creds[6:]).split(':', 1) |
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[150] | 236 | passwd = base64.b64encode(hashlib.sha1(passwd).digest()) |
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| 237 | |
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| 238 | if name not in users or users[name] != passwd: |
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| 239 | return auth_required() |
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| 240 | |
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[160] | 241 | return o_exec(self, transforms, *args, **kwargs) |
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[150] | 242 | |
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| 243 | except: |
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| 244 | return auth_required() |
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| 245 | |
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[160] | 246 | cls._execute = execute |
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[150] | 247 | return cls |
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| 248 | |
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| 249 | def load_htpasswd(path): |
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| 250 | users = {} |
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| 251 | try: |
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| 252 | with open(path) as fp: |
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| 253 | for line in fp: |
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| 254 | line = line.strip() |
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| 255 | if 0 <= line.find(':'): |
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[160] | 256 | name, passwd = line.split(':', 1) |
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[150] | 257 | if passwd.startswith('{SHA}'): |
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| 258 | users[name] = passwd[5:] |
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[156] | 259 | if not users: |
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[160] | 260 | raise ValueError('no valid users found') |
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[150] | 261 | except TypeError: |
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| 262 | pass |
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| 263 | return users |
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| 264 | |
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[160] | 265 | realpath(args, 'keyfile', 'certfile', 'htpasswd') |
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[143] | 266 | |
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[160] | 267 | if args.keyfile and args.certfile: |
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| 268 | ssl_options = {'keyfile': args.keyfile, 'certfile': args.certfile} |
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| 269 | elif args.keyfile or args.certfile: |
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[143] | 270 | raise ValueError('both keyfile and certfile are required') |
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[160] | 271 | else: |
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[143] | 272 | ssl_options = None |
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| 273 | |
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[160] | 274 | if args.port is None: |
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[143] | 275 | if ssl_options: |
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| 276 | args.port = 443 |
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| 277 | else: |
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| 278 | args.port = 80 |
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[160] | 279 | elif not (0 <= args.port <= 65535): |
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| 280 | raise ValueError('invalid port: %s' % args.port) |
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[143] | 281 | |
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[160] | 282 | handler = wrap_basic_auth(EtherWebSocketHandler, |
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| 283 | load_htpasswd(args.htpasswd)) |
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| 284 | |
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[138] | 285 | tap = TapHandler(args.device, debug=args.debug) |
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[133] | 286 | app = tornado.web.Application([ |
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[150] | 287 | (args.path, handler, {'tap': tap, 'debug': args.debug}), |
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[133] | 288 | ]) |
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[143] | 289 | server = tornado.httpserver.HTTPServer(app, ssl_options=ssl_options) |
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[133] | 290 | server.listen(args.port, address=args.address) |
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| 291 | |
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[138] | 292 | ioloop = tornado.ioloop.IOLoop.instance() |
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| 293 | ioloop.add_handler(tap.fileno(), tap, ioloop.READ) |
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[151] | 294 | |
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| 295 | if not args.foreground: |
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| 296 | daemonize() |
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| 297 | |
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[138] | 298 | ioloop.start() |
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[133] | 299 | |
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| 300 | |
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| 301 | def client_main(args): |
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[160] | 302 | realpath(args, 'cacerts') |
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| 303 | |
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[133] | 304 | if args.debug: |
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| 305 | websocket.enableTrace(True) |
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| 306 | |
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[156] | 307 | if not args.insecure: |
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| 308 | websocket._SSLSocketWrapper = \ |
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| 309 | lambda s: ssl.wrap_socket(s, cert_reqs=ssl.CERT_REQUIRED, |
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| 310 | ca_certs=args.cacerts) |
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| 311 | |
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[160] | 312 | if args.user and args.passwd is None: |
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| 313 | args.passwd = getpass.getpass() |
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[143] | 314 | |
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[138] | 315 | tap = TapHandler(args.device, debug=args.debug) |
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[160] | 316 | client = EtherWebSocketClient(tap, args.uri, |
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| 317 | args.user, args.passwd, args.debug) |
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[151] | 318 | |
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[133] | 319 | tap.register_client(client) |
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[151] | 320 | client.open() |
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[133] | 321 | |
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[138] | 322 | ioloop = tornado.ioloop.IOLoop.instance() |
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| 323 | ioloop.add_handler(tap.fileno(), tap, ioloop.READ) |
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[151] | 324 | |
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[160] | 325 | t = threading.Thread(target=ioloop.start) |
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| 326 | t.setDaemon(True) |
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| 327 | |
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[151] | 328 | if not args.foreground: |
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| 329 | daemonize() |
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| 330 | |
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| 331 | t.start() |
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[160] | 332 | client.run_forever() |
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[133] | 333 | |
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[138] | 334 | |
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[133] | 335 | def main(): |
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| 336 | parser = argparse.ArgumentParser() |
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| 337 | parser.add_argument('--device', action='store', default='ethws%d') |
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| 338 | parser.add_argument('--foreground', action='store_true', default=False) |
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| 339 | parser.add_argument('--debug', action='store_true', default=False) |
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| 340 | |
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| 341 | subparsers = parser.add_subparsers(dest='subcommand') |
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| 342 | |
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[158] | 343 | parser_s = subparsers.add_parser('server') |
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| 344 | parser_s.add_argument('--address', action='store', default='') |
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| 345 | parser_s.add_argument('--port', action='store', type=int) |
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| 346 | parser_s.add_argument('--path', action='store', default='/') |
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| 347 | parser_s.add_argument('--htpasswd', action='store') |
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| 348 | parser_s.add_argument('--keyfile', action='store') |
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| 349 | parser_s.add_argument('--certfile', action='store') |
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[133] | 350 | |
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[158] | 351 | parser_c = subparsers.add_parser('client') |
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| 352 | parser_c.add_argument('--uri', action='store', required=True) |
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| 353 | parser_c.add_argument('--insecure', action='store_true', default=False) |
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| 354 | parser_c.add_argument('--cacerts', action='store') |
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| 355 | parser_c.add_argument('--user', action='store') |
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[160] | 356 | parser_c.add_argument('--passwd', action='store') |
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[133] | 357 | |
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| 358 | args = parser.parse_args() |
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| 359 | |
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| 360 | if args.subcommand == 'server': |
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| 361 | server_main(args) |
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| 362 | elif args.subcommand == 'client': |
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| 363 | client_main(args) |
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| 364 | |
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| 365 | |
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| 366 | if __name__ == '__main__': |
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| 367 | main() |
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