Mercurial > libervia-backend
annotate src/plugins/plugin_sec_otr.py @ 1169:a3354063dfb6
plugin OTR: disconnect the active OTR sessions and delete the context on profile disconnection
| author | souliane <souliane@mailoo.org> |
|---|---|
| date | Fri, 05 Sep 2014 11:01:14 +0200 |
| parents | 39572f9d5249 |
| children | 2df6427a5299 |
| rev | line source |
|---|---|
| 1055 | 1 #!/usr/bin/python |
| 2 # -*- coding: utf-8 -*- | |
| 3 | |
| 4 # SAT plugin for OTR encryption | |
| 5 # Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 Jérôme Poisson (goffi@goffi.org) | |
| 6 | |
| 7 # This program is free software: you can redistribute it and/or modify | |
| 8 # it under the terms of the GNU Affero General Public License as published by | |
| 9 # the Free Software Foundation, either version 3 of the License, or | |
| 10 # (at your option) any later version. | |
| 11 | |
| 12 # This program is distributed in the hope that it will be useful, | |
| 13 # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 # GNU Affero General Public License for more details. | |
| 16 | |
| 17 # You should have received a copy of the GNU Affero General Public License | |
| 18 # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 | |
| 20 # XXX: thanks to Darrik L Mazey for his documentation (https://blog.darmasoft.net/2013/06/30/using-pure-python-otr.html) | |
| 21 # this implentation is based on it | |
| 22 | |
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23 from sat.core.i18n import _, D_ |
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24 from sat.core.constants import Const as C |
| 1055 | 25 from sat.core.log import getLogger |
| 26 from sat.core import exceptions | |
| 27 log = getLogger(__name__) | |
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28 from sat.tools import xml_tools |
| 1055 | 29 from twisted.words.protocols.jabber import jid |
| 30 from twisted.python import failure | |
| 1095 | 31 from twisted.internet import defer |
| 1055 | 32 import potr |
| 1095 | 33 from sat.memory import persistent |
| 34 | |
| 35 NS_OTR = "otr_plugin" | |
| 36 PRIVATE_KEY = "PRIVATE KEY" | |
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37 MAIN_MENU = D_('OTR') |
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38 AUTH_TXT = D_("To authenticate your correspondent, you need to give your below fingerprint *BY AN EXTERNAL CANAL* (i.e. not in this chat), and check that the one he give you is the same as below. If there is a mismatch, there can be a spy between you !") |
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plugin OTR: added ability to drop private key
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39 DROP_TXT = D_("You private key is used to encrypt messages for your correspondent, nobody except you must know it, if you are in doubt, you should drop it !\n\nAre you sure you want to drop your private key ?") |
| 1055 | 40 |
| 41 DEFAULT_POLICY_FLAGS = { | |
| 42 'ALLOW_V1':False, | |
| 43 'ALLOW_V2':True, | |
| 44 'REQUIRE_ENCRYPTION':True, | |
| 45 } | |
| 46 | |
| 47 PLUGIN_INFO = { | |
| 48 "name": "OTR", | |
| 49 "import_name": "OTR", | |
| 50 "type": "SEC", | |
| 51 "protocols": [], | |
| 52 "dependencies": [], | |
| 53 "main": "OTR", | |
| 54 "handler": "no", | |
| 55 "description": _("""Implementation of OTR""") | |
| 56 } | |
| 57 | |
| 58 | |
| 59 class Context(potr.context.Context): | |
| 1095 | 60 def __init__(self, host, account, other_jid): |
| 61 super(Context, self).__init__(account, other_jid) | |
| 1055 | 62 self.host = host |
| 63 | |
| 64 def getPolicy(self, key): | |
| 65 if key in DEFAULT_POLICY_FLAGS: | |
| 66 return DEFAULT_POLICY_FLAGS[key] | |
| 67 else: | |
| 68 return False | |
| 69 | |
| 1095 | 70 def inject(self, msg_str, appdata=None): |
| 71 assert isinstance(self.peer, jid.JID) | |
| 72 msg = msg_str.decode('utf-8') | |
| 73 client = self.user.client | |
| 74 log.debug(u'inject(%s, appdata=%s, to=%s)' % (msg, appdata, self.peer)) | |
| 1055 | 75 mess_data = {'message': msg, |
| 76 'type': 'chat', | |
| 77 'from': client.jid, | |
| 1095 | 78 'to': self.peer, |
| 1055 | 79 'subject': None, |
| 80 } | |
| 81 self.host.generateMessageXML(mess_data) | |
| 82 client.xmlstream.send(mess_data['xml']) | |
| 83 | |
| 84 def setState(self, state): | |
| 1095 | 85 old_state = self.state |
| 1055 | 86 super(Context, self).setState(state) |
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87 log.debug(u"setState: %s (old_state=%s)" % (state, old_state)) |
| 1095 | 88 |
| 89 if state == potr.context.STATE_PLAINTEXT: | |
| 90 feedback = _(u"/!\\ conversation with %(other_jid)s is now UNENCRYPTED") % {'other_jid': self.peer.full()} | |
| 91 elif state == potr.context.STATE_ENCRYPTED: | |
| 92 try: | |
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93 trusted = self.getCurrentTrust() |
| 1095 | 94 except TypeError: |
| 95 trusted = False | |
| 96 trusted_str = _(u"trusted") if trusted else _(u"untrusted") | |
| 97 | |
| 98 if old_state == potr.context.STATE_ENCRYPTED: | |
| 99 feedback = _(u"%(trusted)s OTR conversation with %(other_jid)s REFRESHED") % {'trusted': trusted_str, 'other_jid': self.peer.full()} | |
| 100 else: | |
| 101 feedback = _(u"%(trusted)s Encrypted OTR conversation started with %(other_jid)s") % {'trusted': trusted_str, 'other_jid': self.peer.full()} | |
| 102 elif state == potr.context.STATE_FINISHED: | |
| 103 feedback = _(u"OTR conversation with %(other_jid)s is FINISHED") % {'other_jid': self.peer.full()} | |
| 104 else: | |
| 105 log.error(_(u"Unknown OTR state")) | |
| 106 return | |
| 107 | |
| 108 client = self.user.client | |
| 109 # FIXME: newMessage should manage system message, so they don't appear as coming from the contact | |
| 110 self.host.bridge.newMessage(client.jid.full(), | |
| 111 feedback, | |
| 112 mess_type="headline", | |
| 113 to_jid=self.peer.full(), | |
| 114 extra={}, | |
| 115 profile=client.profile) | |
| 116 # TODO: send signal to frontends | |
| 1055 | 117 |
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118 def disconnect(self): |
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119 """Disconnect the session.""" |
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120 if self.state != potr.context.STATE_PLAINTEXT: |
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121 super(Context, self).disconnect() |
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122 |
| 1055 | 123 |
| 124 class Account(potr.context.Account): | |
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125 #TODO: manage trusted keys: if a fingerprint is not used anymore, we have no way to remove it from database yet (same thing for a correspondent jid) |
| 1055 | 126 |
| 1095 | 127 def __init__(self, host, client): |
| 128 log.debug(u"new account: %s" % client.jid) | |
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129 if not client.jid.resource: |
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130 log.warning("Account created without resource") |
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131 super(Account, self).__init__(unicode(client.jid), "xmpp", 1024) |
| 1095 | 132 self.host = host |
| 133 self.client = client | |
| 1055 | 134 |
| 135 def loadPrivkey(self): | |
| 1095 | 136 log.debug(u"loadPrivkey") |
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137 return self.privkey |
| 1055 | 138 |
| 139 def savePrivkey(self): | |
| 1095 | 140 log.debug(u"savePrivkey") |
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141 if self.privkey is None: |
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142 raise exceptions.InternalError(_("Save is called but privkey is None !")) |
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143 priv_key = self.privkey.serializePrivateKey().encode('hex') |
| 1095 | 144 d = self.host.memory.encryptValue(priv_key, self.client.profile) |
| 145 def save_encrypted_key(encrypted_priv_key): | |
| 146 self.client.otr_data[PRIVATE_KEY] = encrypted_priv_key | |
| 147 d.addCallback(save_encrypted_key) | |
| 1055 | 148 |
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149 def loadTrusts(self): |
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150 trust_data = self.client.otr_data.get('trust', {}) |
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151 for jid_, jid_data in trust_data.iteritems(): |
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152 for fingerprint, trust_level in jid_data.iteritems(): |
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153 log.debug('setting trust for {jid}: [{fingerprint}] = "{trust_level}"'.format(jid=jid_, fingerprint=fingerprint, trust_level=trust_level)) |
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154 self.trusts.setdefault(jid.JID(jid_), {})[fingerprint] = trust_level |
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155 |
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156 def saveTrusts(self): |
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157 log.debug("saving trusts for {profile}".format(profile=self.client.profile)) |
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158 log.debug("trusts = {}".format(self.client.otr_data['trust'])) |
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159 self.client.otr_data.force('trust') |
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160 |
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161 def setTrust(self, other_jid, fingerprint, trustLevel): |
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162 try: |
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163 trust_data = self.client.otr_data['trust'] |
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164 except KeyError: |
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165 trust_data = {} |
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166 self.client.otr_data['trust'] = trust_data |
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167 jid_data = trust_data.setdefault(other_jid.full(), {}) |
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168 jid_data[fingerprint] = trustLevel |
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169 super(Account, self).setTrust(other_jid, fingerprint, trustLevel) |
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170 |
| 1055 | 171 |
| 172 class ContextManager(object): | |
| 173 | |
| 174 def __init__(self, host, client): | |
| 175 self.host = host | |
| 1095 | 176 self.account = Account(host, client) |
| 1055 | 177 self.contexts = {} |
| 178 | |
| 1095 | 179 def startContext(self, other_jid): |
| 180 assert isinstance(other_jid, jid.JID) | |
| 181 context = self.contexts.setdefault(other_jid, Context(self.host, self.account, other_jid)) | |
| 182 return context | |
| 1055 | 183 |
| 184 def getContextForUser(self, other): | |
| 1095 | 185 log.debug(u"getContextForUser [%s]" % other) |
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186 if not other.resource: |
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187 log.warning("getContextForUser called with a bare jid") |
| 1055 | 188 return self.startContext(other) |
| 189 | |
| 190 | |
| 191 class OTR(object): | |
| 192 | |
| 193 def __init__(self, host): | |
| 1095 | 194 log.info(_(u"OTR plugin initialization")) |
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195 self._fixPotr() # FIXME: to be removed when potr will be fixed |
| 1055 | 196 self.host = host |
| 197 self.context_managers = {} | |
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198 self.skipped_profiles = set() |
| 1055 | 199 host.trigger.add("MessageReceived", self.MessageReceivedTrigger, priority=100000) |
| 200 host.trigger.add("sendMessage", self.sendMessageTrigger, priority=100000) | |
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201 host.bridge.addMethod("skipOTR", ".plugin", in_sign='s', out_sign='', method=self._skipOTR) |
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202 host.importMenu((MAIN_MENU, D_("Start/Refresh")), self._startRefresh, security_limit=0, help_string=D_("Start or refresh an OTR session"), type_=C.MENU_SINGLE) |
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203 host.importMenu((MAIN_MENU, D_("End session")), self._endSession, security_limit=0, help_string=D_("Finish an OTR session"), type_=C.MENU_SINGLE) |
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204 host.importMenu((MAIN_MENU, D_("Authenticate")), self._authenticate, security_limit=0, help_string=D_("Authenticate user/see your fingerprint"), type_=C.MENU_SINGLE) |
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205 host.importMenu((MAIN_MENU, D_("Drop private key")), self._dropPrivKey, security_limit=0, type_=C.MENU_SINGLE) |
| 1055 | 206 |
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207 def _fixPotr(self): |
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208 # FIXME: potr fix for bad unicode handling |
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209 # this method monkeypatch it, must be removed when potr |
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210 # is fixed |
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211 |
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212 def getDefaultQueryMessage(self, policy): |
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213 defaultQuery = '?OTRv{versions}?\nI would like to start ' \ |
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214 'an Off-the-Record private conversation. However, you ' \ |
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215 'do not have a plugin to support that.\nSee '\ |
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216 'https://otr.cypherpunks.ca/ for more information.' |
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217 v = '2' if policy('ALLOW_V2') else '' |
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218 msg = defaultQuery.format(versions=v) |
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219 return msg.encode('ascii') |
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220 |
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221 potr.context.Account.getDefaultQueryMessage = getDefaultQueryMessage |
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222 |
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223 def _skipOTR(self, profile): |
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224 """Tell the backend to not handle OTR for this profile. |
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225 |
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226 @param profile (str): %(doc_profile)s |
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227 """ |
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228 self.skipped_profiles.add(profile) |
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229 |
| 1095 | 230 @defer.inlineCallbacks |
| 1055 | 231 def profileConnected(self, profile): |
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232 if profile in self.skipped_profiles: |
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233 return |
| 1055 | 234 client = self.host.getClient(profile) |
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235 ctxMng = self.context_managers[profile] = ContextManager(self.host, client) |
| 1095 | 236 client.otr_data = persistent.PersistentBinaryDict(NS_OTR, profile) |
| 237 yield client.otr_data.load() | |
| 238 encrypted_priv_key = client.otr_data.get(PRIVATE_KEY, None) | |
| 239 if encrypted_priv_key is not None: | |
| 240 priv_key = yield self.host.memory.decryptValue(encrypted_priv_key, profile) | |
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241 ctxMng.account.privkey = potr.crypt.PK.parsePrivateKey(priv_key.decode('hex'))[0] |
| 1095 | 242 else: |
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243 ctxMng.account.privkey = None |
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244 ctxMng.account.loadTrusts() |
| 1055 | 245 |
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246 def profileDisconnected(self, profile): |
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247 try: |
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248 for context in self.context_managers[profile].contexts.values(): |
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249 context.disconnect() |
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250 del self.context_managers[profile] |
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251 except KeyError: |
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252 pass |
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253 try: |
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254 self.skipped_profiles.remove(profile) |
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255 except KeyError: |
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256 pass |
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257 |
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258 def _startRefresh(self, menu_data, profile): |
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259 """Start or refresh an OTR session |
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260 |
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261 @param menu_data: %(menu_data)s |
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262 @param profile: %(doc_profile)s |
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263 """ |
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264 try: |
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265 to_jid = jid.JID(menu_data['jid']) |
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266 if not to_jid.resource: |
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267 to_jid.resource = self.host.memory.getLastResource(to_jid, profile) # FIXME: temporary and unsecure, must be changed when frontends are refactored |
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268 except KeyError: |
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269 log.error(_("jid key is not present !")) |
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270 return defer.fail(exceptions.DataError) |
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271 otrctx = self.context_managers[profile].getContextForUser(to_jid) |
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272 query = otrctx.sendMessage(0, '?OTRv?') |
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273 otrctx.inject(query) |
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274 return {} |
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275 |
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276 def _endSession(self, menu_data, profile): |
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277 """End an OTR session |
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278 |
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279 @param menu_data: %(menu_data)s |
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280 @param profile: %(doc_profile)s |
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281 """ |
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282 try: |
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283 to_jid = jid.JID(menu_data['jid']) |
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284 if not to_jid.resource: |
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285 to_jid.resource = self.host.memory.getLastResource(to_jid, profile) # FIXME: temporary and unsecure, must be changed when frontends are refactored |
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286 except KeyError: |
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287 log.error(_("jid key is not present !")) |
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288 return defer.fail(exceptions.DataError) |
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289 otrctx = self.context_managers[profile].getContextForUser(to_jid) |
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290 otrctx.disconnect() |
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291 return {} |
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292 |
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293 def _authenticate(self, menu_data, profile): |
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294 """Authenticate other user and see our own fingerprint |
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295 |
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296 @param menu_data: %(menu_data)s |
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297 @param profile: %(doc_profile)s |
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298 """ |
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299 try: |
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300 to_jid = jid.JID(menu_data['jid']) |
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301 if not to_jid.resource: |
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302 to_jid.resource = self.host.memory.getLastResource(to_jid, profile) # FIXME: temporary and unsecure, must be changed when frontends are refactored |
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303 except KeyError: |
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304 log.error(_("jid key is not present !")) |
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305 return defer.fail(exceptions.DataError) |
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306 ctxMng = self.context_managers[profile] |
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307 otrctx = ctxMng.getContextForUser(to_jid) |
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308 priv_key = ctxMng.account.privkey |
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309 |
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310 if priv_key is None: |
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311 # we have no private key yet |
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312 dialog = xml_tools.XMLUI(C.XMLUI_DIALOG, |
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313 dialog_opt = {C.XMLUI_DATA_TYPE: C.XMLUI_DIALOG_MESSAGE, |
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314 C.XMLUI_DATA_MESS: _("You have no private key yet, start an OTR conversation to have one"), |
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315 C.XMLUI_DATA_LVL: C.XMLUI_DATA_LVL_WARNING |
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316 }, |
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317 title = _("No private key"), |
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318 ) |
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319 return {'xmlui': dialog.toXml()} |
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320 |
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321 other_fingerprint = otrctx.getCurrentKey() |
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322 |
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323 if other_fingerprint is None: |
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324 # we have a private key, but not the fingerprint of our correspondent |
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325 dialog = xml_tools.XMLUI(C.XMLUI_DIALOG, |
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326 dialog_opt = {C.XMLUI_DATA_TYPE: C.XMLUI_DIALOG_MESSAGE, |
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327 C.XMLUI_DATA_MESS: _("Your fingerprint is\n{fingerprint}\n\nStart an OTR conversation to have your correspondent one.").format(fingerprint=priv_key), |
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328 C.XMLUI_DATA_LVL: C.XMLUI_DATA_LVL_INFO |
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329 }, |
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330 title = _("Fingerprint"), |
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331 ) |
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332 return {'xmlui': dialog.toXml()} |
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333 |
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334 def setTrust(raw_data, profile): |
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335 # This method is called when authentication form is submited |
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336 data = xml_tools.XMLUIResult2DataFormResult(raw_data) |
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337 if data['match'] == 'yes': |
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338 otrctx.setCurrentTrust('verified') |
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339 note_msg = _("Your correspondant {correspondent} is now TRUSTED") |
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340 else: |
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341 otrctx.setCurrentTrust('') |
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342 note_msg = _("Your correspondant {correspondent} is now UNTRUSTED") |
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343 note = xml_tools.XMLUI(C.XMLUI_DIALOG, dialog_opt = { |
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344 C.XMLUI_DATA_TYPE: C.XMLUI_DIALOG_NOTE, |
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345 C.XMLUI_DATA_MESS: note_msg.format(correspondent=otrctx.peer)} |
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346 ) |
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347 return {'xmlui': note.toXml()} |
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348 |
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349 submit_id = self.host.registerCallback(setTrust, with_data=True, one_shot=True) |
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350 trusted = bool(otrctx.getCurrentTrust()) |
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351 |
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352 xmlui = xml_tools.XMLUI(C.XMLUI_FORM, title=_('Authentication (%s)') % to_jid.full(), submit_id=submit_id) |
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353 xmlui.addText(_(AUTH_TXT)) |
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354 xmlui.addDivider() |
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355 xmlui.addText(_("Your own fingerprint is:\n{fingerprint}").format(fingerprint=priv_key)) |
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356 xmlui.addText(_("Your correspondent fingerprint should be:\n{fingerprint}").format(fingerprint=other_fingerprint)) |
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357 xmlui.addDivider('blank') |
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358 xmlui.changeContainer('pairs') |
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359 xmlui.addLabel(_('Is your correspondent fingerprint the same as here ?')) |
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360 xmlui.addList("match", [('yes', _('yes')),('no', _('no'))], ['yes' if trusted else 'no']) |
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361 return {'xmlui': xmlui.toXml()} |
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362 |
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363 def _dropPrivKey(self, menu_data, profile): |
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364 """Drop our private Key |
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365 |
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366 @param menu_data: %(menu_data)s |
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367 @param profile: %(doc_profile)s |
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368 """ |
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369 try: |
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370 to_jid = jid.JID(menu_data['jid']) |
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371 if not to_jid.resource: |
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372 to_jid.resource = self.host.memory.getLastResource(to_jid, profile) # FIXME: temporary and unsecure, must be changed when frontends are refactored |
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373 except KeyError: |
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374 log.error(_("jid key is not present !")) |
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375 return defer.fail(exceptions.DataError) |
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376 |
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377 ctxMng = self.context_managers[profile] |
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378 if ctxMng.account.privkey is None: |
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379 return {'xmlui': xml_tools.note(_("You don't have a private key yet !")).toXml()} |
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380 |
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381 def dropKey(data, profile): |
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382 if C.bool(data['answer']): |
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383 # we end all sessions |
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384 for context in ctxMng.contexts.values(): |
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385 context.disconnect() |
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386 ctxMng.account.privkey = None |
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387 ctxMng.account.getPrivkey() # as account.privkey is None, getPrivkey will generate a new key, and save it |
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388 return {'xmlui': xml_tools.note(_("Your private key has been dropped")).toXml()} |
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389 return {} |
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390 |
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391 submit_id = self.host.registerCallback(dropKey, with_data=True, one_shot=True) |
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392 |
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393 confirm = xml_tools.XMLUI(C.XMLUI_DIALOG, title=_('Confirm private key drop'), dialog_opt = {'type': C.XMLUI_DIALOG_CONFIRM, 'message': _(DROP_TXT)}, submit_id = submit_id) |
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394 return {'xmlui': confirm.toXml()} |
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395 |
| 1055 | 396 def _receivedTreatment(self, data, profile): |
| 397 from_jid = jid.JID(data['from']) | |
| 1095 | 398 log.debug(u"_receivedTreatment [from_jid = %s]" % from_jid) |
| 1055 | 399 otrctx = self.context_managers[profile].getContextForUser(from_jid) |
| 1095 | 400 encrypted = True |
| 1055 | 401 |
| 402 try: | |
| 1095 | 403 res = otrctx.receiveMessage(data['body'].encode('utf-8')) |
| 1055 | 404 except potr.context.UnencryptedMessage: |
| 1095 | 405 if otrctx.state == potr.context.STATE_ENCRYPTED: |
| 406 log.warning(u"Received unencrypted message in an encrypted context (from %(jid)s)" % {'jid': from_jid.full()}) | |
| 407 client = self.host.getClient(profile) | |
| 408 self.host.bridge.newMessage(from_jid.full(), | |
| 409 _(u"WARNING: received unencrypted data in a supposedly encrypted context"), | |
| 410 mess_type="headline", # FIXME: add message type for internal informations | |
| 411 to_jid=client.jid.full(), | |
| 412 extra={}, | |
| 413 profile=client.profile) | |
| 1055 | 414 encrypted = False |
| 415 | |
| 1095 | 416 if not encrypted: |
| 1055 | 417 return data |
| 418 else: | |
| 419 if res[0] != None: | |
| 420 # decrypted messages handling. | |
| 421 # receiveMessage() will return a tuple, the first part of which will be the decrypted message | |
| 422 data['body'] = res[0].decode('utf-8') | |
| 423 raise failure.Failure(exceptions.SkipHistory()) # we send the decrypted message to frontends, but we don't want it in history | |
| 424 else: | |
| 425 raise failure.Failure(exceptions.CancelError()) # no message at all (no history, no signal) | |
| 426 | |
| 427 def MessageReceivedTrigger(self, message, post_treat, profile): | |
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428 if profile in self.skipped_profiles: |
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429 return True |
| 1055 | 430 post_treat.addCallback(self._receivedTreatment, profile) |
| 431 return True | |
| 432 | |
| 433 def sendMessageTrigger(self, mess_data, pre_xml_treatments, post_xml_treatments, profile): | |
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434 if profile in self.skipped_profiles: |
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435 return True |
| 1055 | 436 to_jid = mess_data['to'] |
| 437 if mess_data['type'] != 'groupchat' and not to_jid.resource: | |
| 438 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 | |
| 439 otrctx = self.context_managers[profile].getContextForUser(to_jid) | |
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440 if mess_data['type'] != 'groupchat' and otrctx.state != potr.context.STATE_PLAINTEXT: |
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441 if otrctx.state == potr.context.STATE_ENCRYPTED: |
|
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442 log.debug(u"encrypting message") |
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443 otrctx.sendMessage(0, mess_data['message'].encode('utf-8')) |
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444 client = self.host.getClient(profile) |
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445 self.host.sendMessageToBridge(mess_data, client) |
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446 else: |
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447 feedback = D_("Your message was not sent because your correspondent closed the encrypted conversation on his/her side. Either close your own side, or refresh the session.") |
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448 client = self.host.getClient(profile) |
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449 self.host.bridge.newMessage(to_jid.full(), |
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450 feedback, |
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451 mess_type="headline", |
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452 to_jid=client.jid.full(), |
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453 extra={}, |
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454 profile=client.profile) |
| 1055 | 455 return False |
| 456 else: | |
| 1095 | 457 log.debug(u"sending message unencrypted") |
| 1055 | 458 return True |
| 459 |