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annotate src/browser/sat_browser/otrjs_wrapper.py @ 1041:688b52897ba0

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author Goffi <goffi@goffi.org>
date Wed, 24 Jan 2018 09:58:00 +0100
parents fd4eae654182
children f2170536ba23
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1 #!/usr/bin/python
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2 # -*- coding: utf-8 -*-
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3
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4 # Libervia wrapper for otr.js
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5 # Copyright (C) 2009-2017 Jérôme Poisson (goffi@goffi.org)
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6 # Copyright (C) 2013-2016 Adrien Cossa (souliane@mailoo.org)
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7
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8 # This program is free software: you can redistribute it and/or modify
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9 # it under the terms of the GNU Affero General Public License as published by
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10 # the Free Software Foundation, either version 3 of the License, or
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11 # (at your option) any later version.
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12
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13 # This program is distributed in the hope that it will be useful,
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14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 # GNU Affero General Public License for more details.
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17
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18 # You should have received a copy of the GNU Affero General Public License
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19 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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20
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21 """This file is a wrapper for otr.js. It partially reproduces the usage
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22 (modules, classes and attributes names) and behavior of potr, so you
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23 can easily adapt some code based on potr to Pyjamas applications.
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24
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25 potr is released under the GNU LESSER GENERAL PUBLIC LICENSE Version 3
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26 - https://github.com/python-otr/pure-python-otr/blob/master/LICENSE
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27
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28 otr.js is released under the Mozilla Public Licence Version 2.0
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29 - https://github.com/arlolra/otr/blob/master/license
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30 """
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31
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32 from __pyjamas__ import JS
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33
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34 # should you re-use this class outside SàT, you can import __pyjamas__.console as log instead
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35 from sat.core.log import getLogger
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36 log = getLogger(__name__)
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37
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38
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39 # XXX: pyjamas can't probably import more than one JS file, it messes the order.
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40 # XXX: pyjamas needs the file to be in the compilation directory - no submodule.
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41 # XXX: pyjamas needs the imported file to end with a empty line or semi-column.
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42 # FIXME: fix these bugs upstream in Pyjamas
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43 import otr.min.js
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44
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45
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46 def isSupported():
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47 JS("""return (typeof OTR !== 'undefined');""")
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48
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49
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50 if not isSupported():
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51 # see https://developer.mozilla.org/en-US/docs/Web/API/window.crypto.getRandomValues#Browser_Compatibility
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52 log.error('Your browser is not implementing CSPRNG: OTR has been disabled.')
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53 raise ImportError('CSPRNG is not supported by your browser')
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54
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55
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56 class context(object):
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57
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58 # Pre-declare these attributes to avoid the pylint "undefined variable" errors
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59 STATUS_SEND_QUERY = None
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60 STATUS_AKE_INIT = None
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61 STATUS_AKE_SUCCESS = None
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62 STATUS_END_OTR = None
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63 STATE_PLAINTEXT = None
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64 STATE_ENCRYPTED = None
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65 STATE_FINISHED = None
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66 OTR_TAG = None
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67 OTR_VERSION_2 = None
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68 OTR_VERSION_3 = None
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69 WHITESPACE_TAG = None
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70 WHITESPACE_TAG_V2 = None
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71 WHITESPACE_TAG_V3 = None
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72
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73 JS("""
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74 $cls_definition['STATUS_SEND_QUERY'] = OTR.CONST.STATUS_SEND_QUERY;
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75 $cls_definition['STATUS_AKE_INIT'] = OTR.CONST.STATUS_AKE_INIT;
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76 $cls_definition['STATUS_AKE_SUCCESS'] = OTR.CONST.STATUS_AKE_SUCCESS;
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77 $cls_definition['STATUS_END_OTR'] = OTR.CONST.STATUS_END_OTR;
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78 $cls_definition['STATE_PLAINTEXT'] = OTR.CONST.MSGSTATE_PLAINTEXT;
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79 $cls_definition['STATE_ENCRYPTED'] = OTR.CONST.MSGSTATE_ENCRYPTED;
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80 $cls_definition['STATE_FINISHED'] = OTR.CONST.MSGSTATE_FINISHED;
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81 $cls_definition['OTR_TAG'] = OTR.CONST.OTR_TAG;
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82 $cls_definition['OTR_VERSION_2'] = OTR.CONST.OTR_VERSION_2;
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83 $cls_definition['OTR_VERSION_3'] = OTR.CONST.OTR_VERSION_3;
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84 $cls_definition['WHITESPACE_TAG'] = OTR.CONST.WHITESPACE_TAG;
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85 $cls_definition['WHITESPACE_TAG_V2'] = OTR.CONST.WHITESPACE_TAG_V2;
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86 $cls_definition['WHITESPACE_TAG_V3'] = OTR.CONST.WHITESPACE_TAG_V3;
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87 """)
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88
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89 class UnencryptedMessage(Exception):
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90 pass
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91
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92 class Context(object):
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93
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94 def __init__(self, account, peername):
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95 self.user = account
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96 self.peer = peername
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97 self.trustName = self.peer
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98 options = {'fragment_size': 140,
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99 'send_interval': 200,
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100 'priv': account.getPrivkey(), # this would generate the account key if it hasn't been done yet
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101 'debug': False,
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102 }
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103 JS("""self.otr = new OTR(options);""")
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104
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105 for policy in ('ALLOW_V2', 'ALLOW_V3', 'REQUIRE_ENCRYPTION'):
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106 setattr(self.otr, policy, self.getPolicy(policy))
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107
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108 self.otr.on('ui', self.receiveMessageCb)
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109 self.otr.on('io', self.sendMessageCb)
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110 self.otr.on('error', self.messageErrorCb)
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111 self.otr.on('status', lambda status: self.setStateCb(self.otr.msgstate, status))
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112 self.otr.on('smp', self.smpAuthCb)
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113
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114 @property
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115 def state(self):
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116 return self.otr.msgstate
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117
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118 @state.setter
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119 def state(self, state):
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120 self.otr.msgstate = state
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121
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122 def getCurrentKey(self):
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123 return self.otr.their_priv_pk
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124
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125 def setTrust(self, fingerprint, trustLevel):
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126 self.user.setTrust(self.trustName, fingerprint, trustLevel)
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127
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128 def setCurrentTrust(self, trustLevel):
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129 self.setTrust(self.otr.their_priv_pk.fingerprint(), trustLevel)
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130
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131 def getTrust(self, fingerprint, default=None):
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132 return self.user.getTrust(self.trustName, fingerprint, default)
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133
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134 def getCurrentTrust(self):
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135 # XXX: the docstring of potr for the return value of this method is incorrect
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136 if self.otr.their_priv_pk is None:
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137 return None
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138 return self.getTrust(self.otr.their_priv_pk.fingerprint(), None)
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139
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140 def getUsedVersion(self):
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141 """Return the otr version that is beeing used"""
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142 # this method doesn't exist in potr, it has been added for convenience
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143 try:
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144 return self.otr.ake.otr_version
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145 except AttributeError:
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146 return None
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147
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148 def disconnect(self):
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149 self.otr.endOtr()
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150
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151 def finish(self):
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152 """Finish the session - avoid to send any message and the user has to manually disconnect"""
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153 # it means TLV of type 1 (two first bytes), message length 0 (2 last bytes)
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154 self.otr.handleTLVs('\x00\x01\x00\x00')
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155
522
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156 def receiveMessage(self, msg):
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157 """Received a message, ask otr.js to (try to) decrypt it"""
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158 self.otr.receiveMsg(msg)
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159
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160 def sendMessage(self, msg):
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161 """Ask otr.js to encrypt a message for sending"""
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162 self.otr.sendMsg(msg)
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163
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164 def sendQueryMessage(self):
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165 """Start or refresh an encryption communication"""
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166 # otr.js offers this method, with potr you have to build the query message yourself
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167 self.otr.sendQueryMsg()
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168
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169 def inject(self, msg, appdata=None):
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170 return self.sendMessageCb(msg, appdata)
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171
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172 def getPolicy(self, key):
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173 raise NotImplementedError
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174
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175 def smpAuthSecret(self, secret, question=None):
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176 return self.otr.smpSecret(secret, question)
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177
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178 def smpAuthAbort(self, act=None):
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179 # XXX: dirty hack to let the triggered method know who aborted the
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180 # authentication. We need it to display the proper feedback and,
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181 # if the correspondent aborted, set the conversation 'unverified'.
522
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182 self.otr.sm.init()
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183 JS("""self.otr.sm.sendMsg(OTR.HLP.packTLV(6, ''))""")
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184 self.smpAuthCb('abort', '', act)
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185
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186 def sendMessageCb(self, msg, meta):
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187 """Actually send the message after it's been encrypted"""
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188 raise NotImplementedError
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189
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190 def receiveMessageCb(self, msg, encrypted):
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191 """Display the message after it's been eventually decrypted"""
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192 raise NotImplementedError
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193
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194 def messageErrorCb(self, error):
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195 """Message error callback"""
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196 raise NotImplementedError
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197
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198 def setStateCb(self, newstate):
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199 raise NotImplementedError
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200
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201 def smpAuthCb(self, newstate):
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202 raise NotImplementedError
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203
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204 class Account(object):
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205
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206 def __init__(self, host):
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207 self.host = host
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208 self.privkey = None
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209 self.trusts = {}
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210
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211 def getPrivkey(self):
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212 # the return value must have a method serializePrivateKey()
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213 # if the key is not saved yet, call savePrivkey to generate it
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214 if self.privkey is None:
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215 self.privkey = self.loadPrivkey()
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216 if self.privkey is None:
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217 JS("""self.privkey = new DSA();""")
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218 self.savePrivkey()
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219 return self.privkey
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220
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221 def setTrust(self, key, fingerprint, trustLevel):
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222 if key not in self.trusts:
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223 self.trusts[key] = {}
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224 self.trusts[key][fingerprint] = trustLevel
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225 self.saveTrusts()
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226
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227 def getTrust(self, key, fingerprint, default=None):
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228 if key not in self.trusts:
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229 return default
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230 return self.trusts[key].get(fingerprint, default)
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231
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232 def loadPrivkey(self):
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233 raise NotImplementedError
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234
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235 def savePrivkey(self):
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236 raise NotImplementedError
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237
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238 def saveTrusts(self):
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239 raise NotImplementedError
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240
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241
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242 class crypt(object):
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243
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244 class PK(object):
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245
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246 def parsePrivateKey(self, key):
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247 JS("""return DSA.parsePrivate(key);""")
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248
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249
537
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250 class proto(object):
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251
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252 @classmethod
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253 def checkForOTR(cls, body):
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254 """Helper method to check if the message contains OTR starting tag or whitespace
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255
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256 @return:
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257 - context.OTR_TAG if the message starts with it
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258 - context.WHITESPACE_TAG if the message contains OTR whitespaces
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259 - None otherwise
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260 """
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261 if body.startswith(context.OTR_TAG):
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262 return context.OTR_TAG
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263 index = body.find(context.WHITESPACE_TAG)
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264 if index < 0:
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265 return False
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266 tags = [body[i:i + 8] for i in range(index, len(body), 8)]
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267 if [True for tag in tags if tag in (context.WHITESPACE_TAG_V2, context.WHITESPACE_TAG_V3)]:
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268 return context.WHITESPACE_TAG
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269 return None
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270
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271
522
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272 # serialazePrivateKey is the method name in potr
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273 JS("""DSA.serializePrivateKey = DSA.packPrivate;""")