Mercurial > libervia-backend
annotate src/plugins/plugin_sec_otr.py @ 1144:2481fa96ac1c
plugin OTR: added ability to drop private key
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Wed, 27 Aug 2014 01:27:24 +0200 |
| parents | 7fcafc3206b1 |
| children | 1ac5ea74dbdf |
| 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 |
| 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") |
| 132 return self.client.otr_priv_key | |
| 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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parents:
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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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plugin OTR: temporary potr monkey patch to work around a unicode bug, to be removed as soon as a potr fixed version is released (potr maintainer should do it soon)
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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 = {} | |
| 193 host.trigger.add("MessageReceived", self.MessageReceivedTrigger, priority=100000) | |
| 194 host.trigger.add("sendMessage", self.sendMessageTrigger, priority=100000) | |
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195 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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196 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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197 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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198 host.importMenu((MAIN_MENU, D_("Drop private key")), self._dropPrivKey, security_limit=0, type_=C.MENU_SINGLE) |
| 1055 | 199 |
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200 def _fixPotr(self): |
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201 # FIXME: potr fix for bad unicode handling |
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202 # this method monkeypatch it, must be removed when potr |
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203 # is fixed |
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204 |
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205 def getDefaultQueryMessage(self, policy): |
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206 defaultQuery = '?OTRv{versions}?\nI would like to start ' \ |
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207 'an Off-the-Record private conversation. However, you ' \ |
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208 'do not have a plugin to support that.\nSee '\ |
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209 'https://otr.cypherpunks.ca/ for more information.' |
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210 v = '2' if policy('ALLOW_V2') else '' |
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211 msg = defaultQuery.format(versions=v) |
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212 return msg.encode('ascii') |
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213 |
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214 potr.context.Account.getDefaultQueryMessage = getDefaultQueryMessage |
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215 |
| 1095 | 216 @defer.inlineCallbacks |
| 1055 | 217 def profileConnected(self, profile): |
| 218 client = self.host.getClient(profile) | |
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219 ctxMng = self.context_managers[profile] = ContextManager(self.host, client) |
| 1095 | 220 client.otr_data = persistent.PersistentBinaryDict(NS_OTR, profile) |
| 221 yield client.otr_data.load() | |
| 222 encrypted_priv_key = client.otr_data.get(PRIVATE_KEY, None) | |
| 223 if encrypted_priv_key is not None: | |
| 224 priv_key = yield self.host.memory.decryptValue(encrypted_priv_key, profile) | |
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225 client.otr_priv_key = potr.crypt.PK.parsePrivateKey(priv_key.decode('hex'))[0] |
| 1095 | 226 else: |
| 227 client.otr_priv_key = None | |
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228 ctxMng.account.loadTrusts() |
| 1055 | 229 |
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230 def _startRefresh(self, menu_data, profile): |
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231 """Start or refresh an OTR session |
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232 |
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233 @param menu_data: %(menu_data)s |
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234 @param profile: %(doc_profile)s |
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235 """ |
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236 try: |
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237 to_jid = jid.JID(menu_data['jid']) |
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238 if not to_jid.resource: |
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239 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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240 except KeyError: |
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241 log.error(_("jid key is not present !")) |
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242 return defer.fail(exceptions.DataError) |
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243 otrctx = self.context_managers[profile].getContextForUser(to_jid) |
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244 query = otrctx.sendMessage(0, '?OTRv?') |
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245 otrctx.inject(query) |
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246 return {} |
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247 |
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248 def _endSession(self, menu_data, profile): |
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249 """End an OTR session |
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250 |
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251 @param menu_data: %(menu_data)s |
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252 @param profile: %(doc_profile)s |
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253 """ |
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254 try: |
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255 to_jid = jid.JID(menu_data['jid']) |
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256 if not to_jid.resource: |
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257 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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258 except KeyError: |
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259 log.error(_("jid key is not present !")) |
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260 return defer.fail(exceptions.DataError) |
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261 otrctx = self.context_managers[profile].getContextForUser(to_jid) |
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262 otrctx.disconnect() |
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263 return {} |
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264 |
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265 def _authenticate(self, menu_data, profile): |
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266 """Authenticate other user and see our own fingerprint |
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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 |
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280 priv_key = otrctx.user.client.otr_priv_key |
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281 |
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282 if priv_key is None: |
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283 # we have no private key yet |
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284 dialog = xml_tools.XMLUI(C.XMLUI_DIALOG, |
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285 dialog_opt = {C.XMLUI_DATA_TYPE: C.XMLUI_DIALOG_MESSAGE, |
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286 C.XMLUI_DATA_MESS: _("You have no private key yet, start an OTR conversation to have one"), |
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287 C.XMLUI_DATA_LVL: C.XMLUI_DATA_LVL_WARNING |
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288 }, |
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289 title = _("No private key"), |
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290 ) |
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291 return {'xmlui': dialog.toXml()} |
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292 |
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293 other_fingerprint = otrctx.getCurrentKey() |
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294 |
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295 if other_fingerprint is None: |
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296 # we have a private key, but not the fingerprint of our correspondent |
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297 dialog = xml_tools.XMLUI(C.XMLUI_DIALOG, |
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298 dialog_opt = {C.XMLUI_DATA_TYPE: C.XMLUI_DIALOG_MESSAGE, |
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299 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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300 C.XMLUI_DATA_LVL: C.XMLUI_DATA_LVL_INFO |
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301 }, |
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302 title = _("Fingerprint"), |
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303 ) |
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304 return {'xmlui': dialog.toXml()} |
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305 |
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306 def setTrust(raw_data, profile): |
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307 # This method is called when authentication form is submited |
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308 data = xml_tools.XMLUIResult2DataFormResult(raw_data) |
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309 if data['match'] == 'yes': |
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310 otrctx.setCurrentTrust('verified') |
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311 note_msg = _("Your correspondant {correspondent} is now TRUSTED") |
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312 else: |
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313 otrctx.setCurrentTrust('') |
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314 note_msg = _("Your correspondant {correspondent} is now UNTRUSTED") |
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315 note = xml_tools.XMLUI(C.XMLUI_DIALOG, dialog_opt = { |
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316 C.XMLUI_DATA_TYPE: C.XMLUI_DIALOG_NOTE, |
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317 C.XMLUI_DATA_MESS: note_msg.format(correspondent=otrctx.user.name)} |
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318 ) |
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319 return {'xmlui': note.toXml()} |
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320 |
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321 submit_id = self.host.registerCallback(setTrust, with_data=True, one_shot=True) |
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322 trusted = bool(otrctx.getCurrentTrust()) |
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323 |
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324 xmlui = xml_tools.XMLUI(C.XMLUI_FORM, title=_('Authentication (%s)') % to_jid.full(), submit_id=submit_id) |
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325 xmlui.addText(_(AUTH_TXT)) |
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326 xmlui.addDivider() |
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327 xmlui.addText(_("Your own fingerprint is:\n{fingerprint}").format(fingerprint=priv_key)) |
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328 xmlui.addText(_("Your correspondent fingerprint should be:\n{fingerprint}").format(fingerprint=other_fingerprint)) |
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329 xmlui.addDivider('blank') |
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330 xmlui.changeContainer('pairs') |
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331 xmlui.addLabel(_('Is your correspondent fingerprint the same as here ?')) |
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332 xmlui.addList("match", [('yes', _('yes')),('no', _('no'))], ['yes' if trusted else 'no']) |
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333 return {'xmlui': xmlui.toXml()} |
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334 |
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335 def _dropPrivKey(self, menu_data, profile): |
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336 """Drop our private Key |
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337 |
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338 @param menu_data: %(menu_data)s |
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339 @param profile: %(doc_profile)s |
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340 """ |
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341 try: |
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342 to_jid = jid.JID(menu_data['jid']) |
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343 if not to_jid.resource: |
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344 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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345 except KeyError: |
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346 log.error(_("jid key is not present !")) |
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347 return defer.fail(exceptions.DataError) |
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348 |
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349 client = self.host.getClient(profile) |
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350 if client.otr_priv_key is None: |
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351 return {'xmlui': xml_tools.note(_("You don't have a private key yet !")).toXml()} |
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352 |
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353 def dropKey(data, profile): |
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354 if C.bool(data['answer']): |
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355 # we end all sessions |
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356 ctxMng = self.context_managers[profile] |
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357 for context in ctxMng.contexts.values(): |
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358 if context.state not in (potr.context.STATE_FINISHED, potr.context.STATE_PLAINTEXT): |
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359 context.disconnect() |
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360 client.otr_priv_key = None |
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361 ctxMng.account.privkey = None |
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362 ctxMng.account.getPrivkey() # as client.otr_priv_key and account.privkey are None, getPrivkey will generate a new key, and save it |
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363 return {'xmlui': xml_tools.note(_("Your private key has been dropped")).toXml()} |
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364 return {} |
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365 |
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366 submit_id = self.host.registerCallback(dropKey, with_data=True, one_shot=True) |
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367 |
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368 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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369 return {'xmlui': confirm.toXml()} |
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370 |
| 1055 | 371 def _receivedTreatment(self, data, profile): |
| 372 from_jid = jid.JID(data['from']) | |
| 1095 | 373 log.debug(u"_receivedTreatment [from_jid = %s]" % from_jid) |
| 1055 | 374 otrctx = self.context_managers[profile].getContextForUser(from_jid) |
| 1095 | 375 encrypted = True |
| 1055 | 376 |
| 377 try: | |
| 1095 | 378 res = otrctx.receiveMessage(data['body'].encode('utf-8')) |
| 1055 | 379 except potr.context.UnencryptedMessage: |
| 1095 | 380 if otrctx.state == potr.context.STATE_ENCRYPTED: |
| 381 log.warning(u"Received unencrypted message in an encrypted context (from %(jid)s)" % {'jid': from_jid.full()}) | |
| 382 client = self.host.getClient(profile) | |
| 383 self.host.bridge.newMessage(from_jid.full(), | |
| 384 _(u"WARNING: received unencrypted data in a supposedly encrypted context"), | |
| 385 mess_type="headline", # FIXME: add message type for internal informations | |
| 386 to_jid=client.jid.full(), | |
| 387 extra={}, | |
| 388 profile=client.profile) | |
| 1055 | 389 encrypted = False |
| 390 | |
| 1095 | 391 if not encrypted: |
| 1055 | 392 return data |
| 393 else: | |
| 394 if res[0] != None: | |
| 395 # decrypted messages handling. | |
| 396 # receiveMessage() will return a tuple, the first part of which will be the decrypted message | |
| 397 data['body'] = res[0].decode('utf-8') | |
| 398 raise failure.Failure(exceptions.SkipHistory()) # we send the decrypted message to frontends, but we don't want it in history | |
| 399 else: | |
| 400 raise failure.Failure(exceptions.CancelError()) # no message at all (no history, no signal) | |
| 401 | |
| 402 def MessageReceivedTrigger(self, message, post_treat, profile): | |
| 403 post_treat.addCallback(self._receivedTreatment, profile) | |
| 404 return True | |
| 405 | |
| 406 def sendMessageTrigger(self, mess_data, pre_xml_treatments, post_xml_treatments, profile): | |
| 407 to_jid = mess_data['to'] | |
| 408 if mess_data['type'] != 'groupchat' and not to_jid.resource: | |
| 409 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 | |
| 410 otrctx = self.context_managers[profile].getContextForUser(to_jid) | |
| 411 if mess_data['type'] != 'groupchat' and otrctx.state == potr.context.STATE_ENCRYPTED: | |
| 1095 | 412 log.debug(u"encrypting message") |
| 413 otrctx.sendMessage(0, mess_data['message'].encode('utf-8')) | |
| 1055 | 414 client = self.host.getClient(profile) |
| 415 self.host.sendMessageToBridge(mess_data, client) | |
| 416 return False | |
| 417 else: | |
| 1095 | 418 log.debug(u"sending message unencrypted") |
| 1055 | 419 return True |
| 420 |