Mercurial > libervia-backend
annotate src/plugins/plugin_sec_otr.py @ 1158:c0f15e52695a
primitivus: use of new keys modules from Urwid SàText
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Thu, 04 Sep 2014 19:05:57 +0200 |
| parents | 652cd93dfdb4 |
| children | 39572f9d5249 |
| 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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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 |
| 118 | |
| 119 class Account(potr.context.Account): | |
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120 #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 | 121 |
| 1095 | 122 def __init__(self, host, client): |
| 123 log.debug(u"new account: %s" % client.jid) | |
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124 if not client.jid.resource: |
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125 log.warning("Account created without resource") |
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126 super(Account, self).__init__(unicode(client.jid), "xmpp", 1024) |
| 1095 | 127 self.host = host |
| 128 self.client = client | |
| 1055 | 129 |
| 130 def loadPrivkey(self): | |
| 1095 | 131 log.debug(u"loadPrivkey") |
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132 return self.privkey |
| 1055 | 133 |
| 134 def savePrivkey(self): | |
| 1095 | 135 log.debug(u"savePrivkey") |
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136 if self.privkey is None: |
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137 raise exceptions.InternalError(_("Save is called but privkey is None !")) |
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138 priv_key = self.privkey.serializePrivateKey().encode('hex') |
| 1095 | 139 d = self.host.memory.encryptValue(priv_key, self.client.profile) |
| 140 def save_encrypted_key(encrypted_priv_key): | |
| 141 self.client.otr_data[PRIVATE_KEY] = encrypted_priv_key | |
| 142 d.addCallback(save_encrypted_key) | |
| 1055 | 143 |
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144 def loadTrusts(self): |
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145 trust_data = self.client.otr_data.get('trust', {}) |
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146 for jid_, jid_data in trust_data.iteritems(): |
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147 for fingerprint, trust_level in jid_data.iteritems(): |
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148 log.debug('setting trust for {jid}: [{fingerprint}] = "{trust_level}"'.format(jid=jid_, fingerprint=fingerprint, trust_level=trust_level)) |
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149 self.trusts.setdefault(jid.JID(jid_), {})[fingerprint] = trust_level |
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150 |
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151 def saveTrusts(self): |
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152 log.debug("saving trusts for {profile}".format(profile=self.client.profile)) |
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153 log.debug("trusts = {}".format(self.client.otr_data['trust'])) |
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154 self.client.otr_data.force('trust') |
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155 |
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156 def setTrust(self, other_jid, fingerprint, trustLevel): |
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157 try: |
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158 trust_data = self.client.otr_data['trust'] |
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159 except KeyError: |
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160 trust_data = {} |
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161 self.client.otr_data['trust'] = trust_data |
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162 jid_data = trust_data.setdefault(other_jid.full(), {}) |
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163 jid_data[fingerprint] = trustLevel |
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164 super(Account, self).setTrust(other_jid, fingerprint, trustLevel) |
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165 |
| 1055 | 166 |
| 167 class ContextManager(object): | |
| 168 | |
| 169 def __init__(self, host, client): | |
| 170 self.host = host | |
| 1095 | 171 self.account = Account(host, client) |
| 1055 | 172 self.contexts = {} |
| 173 | |
| 1095 | 174 def startContext(self, other_jid): |
| 175 assert isinstance(other_jid, jid.JID) | |
| 176 context = self.contexts.setdefault(other_jid, Context(self.host, self.account, other_jid)) | |
| 177 return context | |
| 1055 | 178 |
| 179 def getContextForUser(self, other): | |
| 1095 | 180 log.debug(u"getContextForUser [%s]" % other) |
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181 if not other.resource: |
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182 log.warning("getContextForUser called with a bare jid") |
| 1055 | 183 return self.startContext(other) |
| 184 | |
| 185 | |
| 186 class OTR(object): | |
| 187 | |
| 188 def __init__(self, host): | |
| 1095 | 189 log.info(_(u"OTR plugin initialization")) |
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190 self._fixPotr() # FIXME: to be removed when potr will be fixed |
| 1055 | 191 self.host = host |
| 192 self.context_managers = {} | |
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193 self.skipped_profiles = set() |
| 1055 | 194 host.trigger.add("MessageReceived", self.MessageReceivedTrigger, priority=100000) |
| 195 host.trigger.add("sendMessage", self.sendMessageTrigger, priority=100000) | |
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196 host.bridge.addMethod("skipOTR", ".plugin", in_sign='s', out_sign='', method=self._skipOTR) |
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197 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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198 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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199 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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200 host.importMenu((MAIN_MENU, D_("Drop private key")), self._dropPrivKey, security_limit=0, type_=C.MENU_SINGLE) |
| 1055 | 201 |
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202 def _fixPotr(self): |
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203 # FIXME: potr fix for bad unicode handling |
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204 # this method monkeypatch it, must be removed when potr |
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205 # is fixed |
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206 |
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207 def getDefaultQueryMessage(self, policy): |
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208 defaultQuery = '?OTRv{versions}?\nI would like to start ' \ |
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209 'an Off-the-Record private conversation. However, you ' \ |
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210 'do not have a plugin to support that.\nSee '\ |
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211 'https://otr.cypherpunks.ca/ for more information.' |
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212 v = '2' if policy('ALLOW_V2') else '' |
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213 msg = defaultQuery.format(versions=v) |
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214 return msg.encode('ascii') |
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215 |
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216 potr.context.Account.getDefaultQueryMessage = getDefaultQueryMessage |
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217 |
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218 def _skipOTR(self, profile): |
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219 """Tell the backend to not handle OTR for this profile. |
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220 |
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221 @param profile (str): %(doc_profile)s |
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222 """ |
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223 self.skipped_profiles.add(profile) |
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224 |
| 1095 | 225 @defer.inlineCallbacks |
| 1055 | 226 def profileConnected(self, profile): |
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227 if profile in self.skipped_profiles: |
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228 return |
| 1055 | 229 client = self.host.getClient(profile) |
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230 ctxMng = self.context_managers[profile] = ContextManager(self.host, client) |
| 1095 | 231 client.otr_data = persistent.PersistentBinaryDict(NS_OTR, profile) |
| 232 yield client.otr_data.load() | |
| 233 encrypted_priv_key = client.otr_data.get(PRIVATE_KEY, None) | |
| 234 if encrypted_priv_key is not None: | |
| 235 priv_key = yield self.host.memory.decryptValue(encrypted_priv_key, profile) | |
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236 ctxMng.account.privkey = potr.crypt.PK.parsePrivateKey(priv_key.decode('hex'))[0] |
| 1095 | 237 else: |
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238 ctxMng.account.privkey = None |
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239 ctxMng.account.loadTrusts() |
| 1055 | 240 |
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241 def profileDisconnected(self, profile): |
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242 try: |
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243 self.skipped_profiles.remove(profile) |
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244 except KeyError: |
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245 pass |
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246 |
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247 def _startRefresh(self, menu_data, profile): |
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248 """Start or refresh an OTR session |
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249 |
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250 @param menu_data: %(menu_data)s |
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251 @param profile: %(doc_profile)s |
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252 """ |
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253 try: |
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254 to_jid = jid.JID(menu_data['jid']) |
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255 if not to_jid.resource: |
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256 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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257 except KeyError: |
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258 log.error(_("jid key is not present !")) |
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259 return defer.fail(exceptions.DataError) |
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260 otrctx = self.context_managers[profile].getContextForUser(to_jid) |
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261 query = otrctx.sendMessage(0, '?OTRv?') |
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262 otrctx.inject(query) |
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263 return {} |
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264 |
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265 def _endSession(self, menu_data, profile): |
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266 """End an OTR session |
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267 |
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268 @param menu_data: %(menu_data)s |
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269 @param profile: %(doc_profile)s |
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270 """ |
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271 try: |
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272 to_jid = jid.JID(menu_data['jid']) |
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273 if not to_jid.resource: |
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274 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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275 except KeyError: |
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276 log.error(_("jid key is not present !")) |
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277 return defer.fail(exceptions.DataError) |
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278 otrctx = self.context_managers[profile].getContextForUser(to_jid) |
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279 otrctx.disconnect() |
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280 return {} |
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281 |
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282 def _authenticate(self, menu_data, profile): |
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283 """Authenticate other user and see our own fingerprint |
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284 |
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285 @param menu_data: %(menu_data)s |
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286 @param profile: %(doc_profile)s |
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287 """ |
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288 try: |
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289 to_jid = jid.JID(menu_data['jid']) |
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290 if not to_jid.resource: |
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291 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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292 except KeyError: |
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293 log.error(_("jid key is not present !")) |
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294 return defer.fail(exceptions.DataError) |
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295 ctxMng = self.context_managers[profile] |
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296 otrctx = ctxMng.getContextForUser(to_jid) |
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297 priv_key = ctxMng.account.privkey |
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298 |
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299 if priv_key is None: |
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300 # we have no private key yet |
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301 dialog = xml_tools.XMLUI(C.XMLUI_DIALOG, |
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302 dialog_opt = {C.XMLUI_DATA_TYPE: C.XMLUI_DIALOG_MESSAGE, |
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303 C.XMLUI_DATA_MESS: _("You have no private key yet, start an OTR conversation to have one"), |
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304 C.XMLUI_DATA_LVL: C.XMLUI_DATA_LVL_WARNING |
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305 }, |
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306 title = _("No private key"), |
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307 ) |
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308 return {'xmlui': dialog.toXml()} |
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309 |
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310 other_fingerprint = otrctx.getCurrentKey() |
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311 |
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312 if other_fingerprint is None: |
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313 # we have a private key, but not the fingerprint of our correspondent |
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314 dialog = xml_tools.XMLUI(C.XMLUI_DIALOG, |
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315 dialog_opt = {C.XMLUI_DATA_TYPE: C.XMLUI_DIALOG_MESSAGE, |
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316 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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317 C.XMLUI_DATA_LVL: C.XMLUI_DATA_LVL_INFO |
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318 }, |
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319 title = _("Fingerprint"), |
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320 ) |
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321 return {'xmlui': dialog.toXml()} |
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322 |
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323 def setTrust(raw_data, profile): |
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324 # This method is called when authentication form is submited |
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325 data = xml_tools.XMLUIResult2DataFormResult(raw_data) |
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326 if data['match'] == 'yes': |
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327 otrctx.setCurrentTrust('verified') |
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328 note_msg = _("Your correspondant {correspondent} is now TRUSTED") |
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329 else: |
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330 otrctx.setCurrentTrust('') |
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331 note_msg = _("Your correspondant {correspondent} is now UNTRUSTED") |
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332 note = xml_tools.XMLUI(C.XMLUI_DIALOG, dialog_opt = { |
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333 C.XMLUI_DATA_TYPE: C.XMLUI_DIALOG_NOTE, |
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334 C.XMLUI_DATA_MESS: note_msg.format(correspondent=otrctx.peer)} |
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335 ) |
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336 return {'xmlui': note.toXml()} |
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337 |
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338 submit_id = self.host.registerCallback(setTrust, with_data=True, one_shot=True) |
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339 trusted = bool(otrctx.getCurrentTrust()) |
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340 |
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341 xmlui = xml_tools.XMLUI(C.XMLUI_FORM, title=_('Authentication (%s)') % to_jid.full(), submit_id=submit_id) |
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342 xmlui.addText(_(AUTH_TXT)) |
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343 xmlui.addDivider() |
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344 xmlui.addText(_("Your own fingerprint is:\n{fingerprint}").format(fingerprint=priv_key)) |
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345 xmlui.addText(_("Your correspondent fingerprint should be:\n{fingerprint}").format(fingerprint=other_fingerprint)) |
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346 xmlui.addDivider('blank') |
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347 xmlui.changeContainer('pairs') |
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348 xmlui.addLabel(_('Is your correspondent fingerprint the same as here ?')) |
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349 xmlui.addList("match", [('yes', _('yes')),('no', _('no'))], ['yes' if trusted else 'no']) |
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350 return {'xmlui': xmlui.toXml()} |
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351 |
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352 def _dropPrivKey(self, menu_data, profile): |
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353 """Drop our private Key |
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354 |
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355 @param menu_data: %(menu_data)s |
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356 @param profile: %(doc_profile)s |
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357 """ |
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358 try: |
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359 to_jid = jid.JID(menu_data['jid']) |
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360 if not to_jid.resource: |
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361 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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362 except KeyError: |
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363 log.error(_("jid key is not present !")) |
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364 return defer.fail(exceptions.DataError) |
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365 |
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366 ctxMng = self.context_managers[profile] |
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367 if ctxMng.account.privkey is None: |
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368 return {'xmlui': xml_tools.note(_("You don't have a private key yet !")).toXml()} |
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369 |
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370 def dropKey(data, profile): |
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371 if C.bool(data['answer']): |
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372 # we end all sessions |
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373 for context in ctxMng.contexts.values(): |
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374 if context.state not in (potr.context.STATE_FINISHED, potr.context.STATE_PLAINTEXT): |
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375 context.disconnect() |
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376 ctxMng.account.privkey = None |
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377 ctxMng.account.getPrivkey() # as account.privkey is None, getPrivkey will generate a new key, and save it |
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378 return {'xmlui': xml_tools.note(_("Your private key has been dropped")).toXml()} |
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379 return {} |
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380 |
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381 submit_id = self.host.registerCallback(dropKey, with_data=True, one_shot=True) |
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382 |
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383 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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384 return {'xmlui': confirm.toXml()} |
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385 |
| 1055 | 386 def _receivedTreatment(self, data, profile): |
| 387 from_jid = jid.JID(data['from']) | |
| 1095 | 388 log.debug(u"_receivedTreatment [from_jid = %s]" % from_jid) |
| 1055 | 389 otrctx = self.context_managers[profile].getContextForUser(from_jid) |
| 1095 | 390 encrypted = True |
| 1055 | 391 |
| 392 try: | |
| 1095 | 393 res = otrctx.receiveMessage(data['body'].encode('utf-8')) |
| 1055 | 394 except potr.context.UnencryptedMessage: |
| 1095 | 395 if otrctx.state == potr.context.STATE_ENCRYPTED: |
| 396 log.warning(u"Received unencrypted message in an encrypted context (from %(jid)s)" % {'jid': from_jid.full()}) | |
| 397 client = self.host.getClient(profile) | |
| 398 self.host.bridge.newMessage(from_jid.full(), | |
| 399 _(u"WARNING: received unencrypted data in a supposedly encrypted context"), | |
| 400 mess_type="headline", # FIXME: add message type for internal informations | |
| 401 to_jid=client.jid.full(), | |
| 402 extra={}, | |
| 403 profile=client.profile) | |
| 1055 | 404 encrypted = False |
| 405 | |
| 1095 | 406 if not encrypted: |
| 1055 | 407 return data |
| 408 else: | |
| 409 if res[0] != None: | |
| 410 # decrypted messages handling. | |
| 411 # receiveMessage() will return a tuple, the first part of which will be the decrypted message | |
| 412 data['body'] = res[0].decode('utf-8') | |
| 413 raise failure.Failure(exceptions.SkipHistory()) # we send the decrypted message to frontends, but we don't want it in history | |
| 414 else: | |
| 415 raise failure.Failure(exceptions.CancelError()) # no message at all (no history, no signal) | |
| 416 | |
| 417 def MessageReceivedTrigger(self, message, post_treat, profile): | |
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418 if profile in self.skipped_profiles: |
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419 return True |
| 1055 | 420 post_treat.addCallback(self._receivedTreatment, profile) |
| 421 return True | |
| 422 | |
| 423 def sendMessageTrigger(self, mess_data, pre_xml_treatments, post_xml_treatments, profile): | |
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424 if profile in self.skipped_profiles: |
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425 return True |
| 1055 | 426 to_jid = mess_data['to'] |
| 427 if mess_data['type'] != 'groupchat' and not to_jid.resource: | |
| 428 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 | |
| 429 otrctx = self.context_managers[profile].getContextForUser(to_jid) | |
| 430 if mess_data['type'] != 'groupchat' and otrctx.state == potr.context.STATE_ENCRYPTED: | |
| 1095 | 431 log.debug(u"encrypting message") |
| 432 otrctx.sendMessage(0, mess_data['message'].encode('utf-8')) | |
| 1055 | 433 client = self.host.getClient(profile) |
| 434 self.host.sendMessageToBridge(mess_data, client) | |
| 435 return False | |
| 436 else: | |
| 1095 | 437 log.debug(u"sending message unencrypted") |
| 1055 | 438 return True |
| 439 |