annotate src/plugins/plugin_sec_otr.py @ 1125:d6c3fea5ecfe

quick_frontend, primitivus: add primitivus command ":history [limit]" (default value for limit is 50)
author souliane <souliane@mailoo.org>
date Sat, 23 Aug 2014 20:26:04 +0200
parents ef7b7dd5c5db
children 8def4a3f55c2
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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 # SAT plugin for OTR encryption
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5 # Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 # XXX: thanks to Darrik L Mazey for his documentation (https://blog.darmasoft.net/2013/06/30/using-pure-python-otr.html)
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21 # this implentation is based on it
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22
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23 from sat.core.i18n import _
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24 from sat.core.log import getLogger
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25 from sat.core import exceptions
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26 log = getLogger(__name__)
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27 from twisted.words.protocols.jabber import jid
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28 from twisted.python import failure
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29 from twisted.internet import defer
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30 import potr
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31 from sat.memory import persistent
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32
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33 NS_OTR = "otr_plugin"
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34 PRIVATE_KEY = "PRIVATE KEY"
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35
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36 DEFAULT_POLICY_FLAGS = {
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37 'ALLOW_V1':False,
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38 'ALLOW_V2':True,
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39 'REQUIRE_ENCRYPTION':True,
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40 }
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41
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42 PLUGIN_INFO = {
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43 "name": "OTR",
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44 "import_name": "OTR",
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45 "type": "SEC",
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46 "protocols": [],
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47 "dependencies": [],
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48 "main": "OTR",
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49 "handler": "no",
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50 "description": _("""Implementation of OTR""")
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51 }
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52
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53
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54 class Context(potr.context.Context):
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55
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56 def __init__(self, host, account, other_jid):
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57 super(Context, self).__init__(account, other_jid)
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58 self.host = host
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59
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60 def getPolicy(self, key):
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61 if key in DEFAULT_POLICY_FLAGS:
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62 return DEFAULT_POLICY_FLAGS[key]
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63 else:
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64 return False
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65
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66 def inject(self, msg_str, appdata=None):
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67 assert isinstance(self.peer, jid.JID)
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68 msg = msg_str.decode('utf-8')
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69 client = self.user.client
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70 log.debug(u'inject(%s, appdata=%s, to=%s)' % (msg, appdata, self.peer))
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71 mess_data = {'message': msg,
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72 'type': 'chat',
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73 'from': client.jid,
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74 'to': self.peer,
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75 'subject': None,
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76 }
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77 self.host.generateMessageXML(mess_data)
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78 client.xmlstream.send(mess_data['xml'])
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79
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80 def setState(self, state):
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81 old_state = self.state
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82 super(Context, self).setState(state)
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83 log.debug(u"setState: %s (old_state=%s) " % (state, old_state))
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84
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85 if state == potr.context.STATE_PLAINTEXT:
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86 feedback = _(u"/!\\ conversation with %(other_jid)s is now UNENCRYPTED") % {'other_jid': self.peer.full()}
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87 elif state == potr.context.STATE_ENCRYPTED:
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88 try:
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89 fingerprint, trusted = self.getCurrentTrust()
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90 except TypeError:
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91 trusted = False
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92 trusted_str = _(u"trusted") if trusted else _(u"untrusted")
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93
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94 if old_state == potr.context.STATE_ENCRYPTED:
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95 feedback = _(u"%(trusted)s OTR conversation with %(other_jid)s REFRESHED") % {'trusted': trusted_str, 'other_jid': self.peer.full()}
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96 else:
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97 feedback = _(u"%(trusted)s Encrypted OTR conversation started with %(other_jid)s") % {'trusted': trusted_str, 'other_jid': self.peer.full()}
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98 elif state == potr.context.STATE_FINISHED:
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99 feedback = _(u"OTR conversation with %(other_jid)s is FINISHED") % {'other_jid': self.peer.full()}
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100 else:
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101 log.error(_(u"Unknown OTR state"))
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102 return
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103
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104 client = self.user.client
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105 # FIXME: newMessage should manage system message, so they don't appear as coming from the contact
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106 self.host.bridge.newMessage(client.jid.full(),
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107 feedback,
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108 mess_type="headline",
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109 to_jid=self.peer.full(),
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110 extra={},
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111 profile=client.profile)
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112 # TODO: send signal to frontends
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113
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114
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115 class Account(potr.context.Account):
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116
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117 def __init__(self, host, client):
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118 log.debug(u"new account: %s" % client.jid)
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119 super(Account, self).__init__(client.jid, "xmpp", 1024)
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120 self.host = host
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121 self.client = client
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122
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123 def loadPrivkey(self):
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124 log.debug(u"loadPrivkey")
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125 return self.client.otr_priv_key
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126
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127 def savePrivkey(self):
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128 log.debug(u"savePrivkey")
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129 priv_key = self.getPrivkey().serializePrivateKey()
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130 d = self.host.memory.encryptValue(priv_key, self.client.profile)
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131 def save_encrypted_key(encrypted_priv_key):
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132 self.client.otr_data[PRIVATE_KEY] = encrypted_priv_key
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133 d.addCallback(save_encrypted_key)
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134
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135
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136 class ContextManager(object):
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137
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138 def __init__(self, host, client):
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139 self.host = host
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140 self.account = Account(host, client)
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141 self.contexts = {}
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142
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143 def startContext(self, other_jid):
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144 assert isinstance(other_jid, jid.JID)
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145 context = self.contexts.setdefault(other_jid, Context(self.host, self.account, other_jid))
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146 return context
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147
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148 def getContextForUser(self, other):
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149 log.debug(u"getContextForUser [%s]" % other)
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150 return self.startContext(other)
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151
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152
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153 class OTR(object):
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154
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155 def __init__(self, host):
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156 log.info(_(u"OTR plugin initialization"))
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157 self.host = host
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158 self.context_managers = {}
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159 host.trigger.add("MessageReceived", self.MessageReceivedTrigger, priority=100000)
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160 host.trigger.add("sendMessage", self.sendMessageTrigger, priority=100000)
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161
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162 @defer.inlineCallbacks
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163 def profileConnected(self, profile):
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164 client = self.host.getClient(profile)
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165 self.context_managers[profile] = ContextManager(self.host, client)
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166 client.otr_data = persistent.PersistentBinaryDict(NS_OTR, profile)
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167 yield client.otr_data.load()
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168 encrypted_priv_key = client.otr_data.get(PRIVATE_KEY, None)
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169 if encrypted_priv_key is not None:
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170 priv_key = yield self.host.memory.decryptValue(encrypted_priv_key, profile)
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171 client.otr_priv_key = potr.crypt.PK.parsePrivateKey(priv_key)[0]
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172 else:
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173 client.otr_priv_key = None
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174
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175 def _receivedTreatment(self, data, profile):
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176 from_jid = jid.JID(data['from'])
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177 log.debug(u"_receivedTreatment [from_jid = %s]" % from_jid)
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178 otrctx = self.context_managers[profile].getContextForUser(from_jid)
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179 encrypted = True
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180
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181 try:
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182 res = otrctx.receiveMessage(data['body'].encode('utf-8'))
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183 except potr.context.UnencryptedMessage:
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184 if otrctx.state == potr.context.STATE_ENCRYPTED:
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185 log.warning(u"Received unencrypted message in an encrypted context (from %(jid)s)" % {'jid': from_jid.full()})
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186 client = self.host.getClient(profile)
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187 self.host.bridge.newMessage(from_jid.full(),
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188 _(u"WARNING: received unencrypted data in a supposedly encrypted context"),
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189 mess_type="headline", # FIXME: add message type for internal informations
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190 to_jid=client.jid.full(),
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191 extra={},
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192 profile=client.profile)
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193 encrypted = False
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194
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195 if not encrypted:
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196 return data
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197 else:
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198 if res[0] != None:
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199 # decrypted messages handling.
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200 # receiveMessage() will return a tuple, the first part of which will be the decrypted message
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201 data['body'] = res[0].decode('utf-8')
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202 raise failure.Failure(exceptions.SkipHistory()) # we send the decrypted message to frontends, but we don't want it in history
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203 else:
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204 raise failure.Failure(exceptions.CancelError()) # no message at all (no history, no signal)
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205
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206 def MessageReceivedTrigger(self, message, post_treat, profile):
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207 post_treat.addCallback(self._receivedTreatment, profile)
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208 return True
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209
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210 def sendMessageTrigger(self, mess_data, pre_xml_treatments, post_xml_treatments, profile):
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211 to_jid = mess_data['to']
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212 if mess_data['type'] != 'groupchat' and not to_jid.resource:
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213 to_jid.resource = self.host.memory.getLastResource(to_jid, profile) # FIXME: it's dirty, but frontends don't manage resources correctly now, refactoring is planed
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214 otrctx = self.context_managers[profile].getContextForUser(to_jid)
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215 if mess_data['type'] != 'groupchat' and otrctx.state == potr.context.STATE_ENCRYPTED:
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216 log.debug(u"encrypting message")
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217 otrctx.sendMessage(0, mess_data['message'].encode('utf-8'))
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218 client = self.host.getClient(profile)
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219 self.host.sendMessageToBridge(mess_data, client)
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220 return False
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221 else:
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222 log.debug(u"sending message unencrypted")
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223 return True
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224