Mercurial > libervia-backend
annotate src/plugins/plugin_sec_otr.py @ 1141:7fcafc3206b1
plugin OTR: authentication management + fixed a bug in setState (due to a wrong docstring in potr.context.getCurrentTrust)
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Wed, 27 Aug 2014 00:23:14 +0200 |
| parents | 768f1f1ef12c |
| children | 2481fa96ac1c |
| 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 !") |
| 1055 | 39 |
| 40 DEFAULT_POLICY_FLAGS = { | |
| 41 'ALLOW_V1':False, | |
| 42 'ALLOW_V2':True, | |
| 43 'REQUIRE_ENCRYPTION':True, | |
| 44 } | |
| 45 | |
| 46 PLUGIN_INFO = { | |
| 47 "name": "OTR", | |
| 48 "import_name": "OTR", | |
| 49 "type": "SEC", | |
| 50 "protocols": [], | |
| 51 "dependencies": [], | |
| 52 "main": "OTR", | |
| 53 "handler": "no", | |
| 54 "description": _("""Implementation of OTR""") | |
| 55 } | |
| 56 | |
| 57 | |
| 58 class Context(potr.context.Context): | |
| 1095 | 59 def __init__(self, host, account, other_jid): |
| 60 super(Context, self).__init__(account, other_jid) | |
| 1055 | 61 self.host = host |
| 62 | |
| 63 def getPolicy(self, key): | |
| 64 if key in DEFAULT_POLICY_FLAGS: | |
| 65 return DEFAULT_POLICY_FLAGS[key] | |
| 66 else: | |
| 67 return False | |
| 68 | |
| 1095 | 69 def inject(self, msg_str, appdata=None): |
| 70 assert isinstance(self.peer, jid.JID) | |
| 71 msg = msg_str.decode('utf-8') | |
| 72 client = self.user.client | |
| 73 log.debug(u'inject(%s, appdata=%s, to=%s)' % (msg, appdata, self.peer)) | |
| 1055 | 74 mess_data = {'message': msg, |
| 75 'type': 'chat', | |
| 76 'from': client.jid, | |
| 1095 | 77 'to': self.peer, |
| 1055 | 78 'subject': None, |
| 79 } | |
| 80 self.host.generateMessageXML(mess_data) | |
| 81 client.xmlstream.send(mess_data['xml']) | |
| 82 | |
| 83 def setState(self, state): | |
| 1095 | 84 old_state = self.state |
| 1055 | 85 super(Context, self).setState(state) |
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86 log.debug(u"setState: %s (old_state=%s)" % (state, old_state)) |
| 1095 | 87 |
| 88 if state == potr.context.STATE_PLAINTEXT: | |
| 89 feedback = _(u"/!\\ conversation with %(other_jid)s is now UNENCRYPTED") % {'other_jid': self.peer.full()} | |
| 90 elif state == potr.context.STATE_ENCRYPTED: | |
| 91 try: | |
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92 trusted = self.getCurrentTrust() |
| 1095 | 93 except TypeError: |
| 94 trusted = False | |
| 95 trusted_str = _(u"trusted") if trusted else _(u"untrusted") | |
| 96 | |
| 97 if old_state == potr.context.STATE_ENCRYPTED: | |
| 98 feedback = _(u"%(trusted)s OTR conversation with %(other_jid)s REFRESHED") % {'trusted': trusted_str, 'other_jid': self.peer.full()} | |
| 99 else: | |
| 100 feedback = _(u"%(trusted)s Encrypted OTR conversation started with %(other_jid)s") % {'trusted': trusted_str, 'other_jid': self.peer.full()} | |
| 101 elif state == potr.context.STATE_FINISHED: | |
| 102 feedback = _(u"OTR conversation with %(other_jid)s is FINISHED") % {'other_jid': self.peer.full()} | |
| 103 else: | |
| 104 log.error(_(u"Unknown OTR state")) | |
| 105 return | |
| 106 | |
| 107 client = self.user.client | |
| 108 # FIXME: newMessage should manage system message, so they don't appear as coming from the contact | |
| 109 self.host.bridge.newMessage(client.jid.full(), | |
| 110 feedback, | |
| 111 mess_type="headline", | |
| 112 to_jid=self.peer.full(), | |
| 113 extra={}, | |
| 114 profile=client.profile) | |
| 115 # TODO: send signal to frontends | |
| 1055 | 116 |
| 117 | |
| 118 class Account(potr.context.Account): | |
| 119 | |
| 1095 | 120 def __init__(self, host, client): |
| 121 log.debug(u"new account: %s" % client.jid) | |
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122 if not client.jid.resource: |
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123 log.warning("Account created without resource") |
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124 super(Account, self).__init__(unicode(client.jid), "xmpp", 1024) |
| 1095 | 125 self.host = host |
| 126 self.client = client | |
| 1055 | 127 |
| 128 def loadPrivkey(self): | |
| 1095 | 129 log.debug(u"loadPrivkey") |
| 130 return self.client.otr_priv_key | |
| 1055 | 131 |
| 132 def savePrivkey(self): | |
| 1095 | 133 log.debug(u"savePrivkey") |
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plugin otr: priv_key is better than getPrivKey here, as it should not be None + fixed private key encryption/decryption
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134 if self.privkey is None: |
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135 raise exceptions.InternalError(_("Save is called but privkey is None !")) |
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136 priv_key = self.privkey.serializePrivateKey().encode('hex') |
| 1095 | 137 d = self.host.memory.encryptValue(priv_key, self.client.profile) |
| 138 def save_encrypted_key(encrypted_priv_key): | |
| 139 self.client.otr_data[PRIVATE_KEY] = encrypted_priv_key | |
| 140 d.addCallback(save_encrypted_key) | |
| 1055 | 141 |
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142 def loadTrusts(self): |
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143 trust_data = self.client.otr_data.get('trust', {}) |
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144 for jid_, jid_data in trust_data.iteritems(): |
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145 for fingerprint, trust_level in jid_data.iteritems(): |
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146 log.debug('setting trust for {jid}: [{fingerprint}] = "{trust_level}"'.format(jid=jid_, fingerprint=fingerprint, trust_level=trust_level)) |
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147 self.trusts.setdefault(jid.JID(jid_), {})[fingerprint] = trust_level |
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148 |
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149 def saveTrusts(self): |
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150 log.debug("saving trusts for {profile}".format(profile=self.client.profile)) |
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151 log.debug("trusts = {}".format(self.client.otr_data['trust'])) |
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152 self.client.otr_data.force('trust') |
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153 |
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154 def setTrust(self, other_jid, fingerprint, trustLevel): |
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155 try: |
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156 trust_data = self.client.otr_data['trust'] |
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157 except KeyError: |
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158 trust_data = {} |
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159 self.client.otr_data['trust'] = trust_data |
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160 jid_data = trust_data.setdefault(other_jid.full(), {}) |
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161 jid_data[fingerprint] = trustLevel |
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162 super(Account, self).setTrust(other_jid, fingerprint, trustLevel) |
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163 |
| 1055 | 164 |
| 165 class ContextManager(object): | |
| 166 | |
| 167 def __init__(self, host, client): | |
| 168 self.host = host | |
| 1095 | 169 self.account = Account(host, client) |
| 1055 | 170 self.contexts = {} |
| 171 | |
| 1095 | 172 def startContext(self, other_jid): |
| 173 assert isinstance(other_jid, jid.JID) | |
| 174 context = self.contexts.setdefault(other_jid, Context(self.host, self.account, other_jid)) | |
| 175 return context | |
| 1055 | 176 |
| 177 def getContextForUser(self, other): | |
| 1095 | 178 log.debug(u"getContextForUser [%s]" % other) |
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179 if not other.resource: |
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180 log.warning("getContextForUser called with a bare jid") |
| 1055 | 181 return self.startContext(other) |
| 182 | |
| 183 | |
| 184 class OTR(object): | |
| 185 | |
| 186 def __init__(self, host): | |
| 1095 | 187 log.info(_(u"OTR plugin initialization")) |
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188 self._fixPotr() # FIXME: to be removed when potr will be fixed |
| 1055 | 189 self.host = host |
| 190 self.context_managers = {} | |
| 191 host.trigger.add("MessageReceived", self.MessageReceivedTrigger, priority=100000) | |
| 192 host.trigger.add("sendMessage", self.sendMessageTrigger, priority=100000) | |
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193 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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194 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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195 host.importMenu((MAIN_MENU, D_("Authenticate")), self._authenticate, security_limit=0, help_string=D_("Authenticate user/see your fingerprint"), type_=C.MENU_SINGLE) |
| 1055 | 196 |
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197 def _fixPotr(self): |
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198 # FIXME: potr fix for bad unicode handling |
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199 # this method monkeypatch it, must be removed when potr |
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200 # is fixed |
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201 |
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202 def getDefaultQueryMessage(self, policy): |
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203 defaultQuery = '?OTRv{versions}?\nI would like to start ' \ |
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204 'an Off-the-Record private conversation. However, you ' \ |
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205 'do not have a plugin to support that.\nSee '\ |
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206 'https://otr.cypherpunks.ca/ for more information.' |
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207 v = '2' if policy('ALLOW_V2') else '' |
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208 msg = defaultQuery.format(versions=v) |
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209 return msg.encode('ascii') |
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210 |
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211 potr.context.Account.getDefaultQueryMessage = getDefaultQueryMessage |
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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)
Goffi <goffi@goffi.org>
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212 |
| 1095 | 213 @defer.inlineCallbacks |
| 1055 | 214 def profileConnected(self, profile): |
| 215 client = self.host.getClient(profile) | |
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plugin OTR: authentication management + fixed a bug in setState (due to a wrong docstring in potr.context.getCurrentTrust)
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216 ctxMng = self.context_managers[profile] = ContextManager(self.host, client) |
| 1095 | 217 client.otr_data = persistent.PersistentBinaryDict(NS_OTR, profile) |
| 218 yield client.otr_data.load() | |
| 219 encrypted_priv_key = client.otr_data.get(PRIVATE_KEY, None) | |
| 220 if encrypted_priv_key is not None: | |
| 221 priv_key = yield self.host.memory.decryptValue(encrypted_priv_key, profile) | |
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plugin otr: priv_key is better than getPrivKey here, as it should not be None + fixed private key encryption/decryption
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changeset
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222 client.otr_priv_key = potr.crypt.PK.parsePrivateKey(priv_key.decode('hex'))[0] |
| 1095 | 223 else: |
| 224 client.otr_priv_key = None | |
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plugin OTR: authentication management + fixed a bug in setState (due to a wrong docstring in potr.context.getCurrentTrust)
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225 ctxMng.account.loadTrusts() |
| 1055 | 226 |
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227 def _startRefresh(self, menu_data, profile): |
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228 """Start or refresh an OTR session |
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229 |
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230 @param menu_data: %(menu_data)s |
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231 @param profile: %(doc_profile)s |
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232 """ |
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233 try: |
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234 to_jid = jid.JID(menu_data['jid']) |
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235 if not to_jid.resource: |
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236 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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237 except KeyError: |
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238 log.error(_("jid key is not present !")) |
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239 return defer.fail(exceptions.DataError) |
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240 otrctx = self.context_managers[profile].getContextForUser(to_jid) |
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241 query = otrctx.sendMessage(0, '?OTRv?') |
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242 otrctx.inject(query) |
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243 return {} |
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244 |
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245 def _endSession(self, menu_data, profile): |
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246 """End an OTR session |
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247 |
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248 @param menu_data: %(menu_data)s |
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249 @param profile: %(doc_profile)s |
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250 """ |
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251 try: |
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252 to_jid = jid.JID(menu_data['jid']) |
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253 if not to_jid.resource: |
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254 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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255 except KeyError: |
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256 log.error(_("jid key is not present !")) |
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257 return defer.fail(exceptions.DataError) |
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258 otrctx = self.context_managers[profile].getContextForUser(to_jid) |
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259 otrctx.disconnect() |
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260 return {} |
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261 |
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262 def _authenticate(self, menu_data, profile): |
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263 """Authenticate other user and see our own fingerprint |
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264 |
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265 @param menu_data: %(menu_data)s |
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266 @param profile: %(doc_profile)s |
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267 """ |
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268 try: |
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269 to_jid = jid.JID(menu_data['jid']) |
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270 if not to_jid.resource: |
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271 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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272 except KeyError: |
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273 log.error(_("jid key is not present !")) |
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274 return defer.fail(exceptions.DataError) |
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275 otrctx = self.context_managers[profile].getContextForUser(to_jid) |
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276 |
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277 priv_key = otrctx.user.client.otr_priv_key |
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278 |
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279 if priv_key is None: |
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280 # we have no private key yet |
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281 dialog = xml_tools.XMLUI(C.XMLUI_DIALOG, |
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282 dialog_opt = {C.XMLUI_DATA_TYPE: C.XMLUI_DIALOG_MESSAGE, |
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283 C.XMLUI_DATA_MESS: _("You have no private key yet, start an OTR conversation to have one"), |
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284 C.XMLUI_DATA_LVL: C.XMLUI_DATA_LVL_WARNING |
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285 }, |
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286 title = _("No private key"), |
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287 ) |
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288 return {'xmlui': dialog.toXml()} |
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289 |
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290 other_fingerprint = otrctx.getCurrentKey() |
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291 |
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292 if other_fingerprint is None: |
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293 # we have a private key, but not the fingerprint of our correspondent |
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294 dialog = xml_tools.XMLUI(C.XMLUI_DIALOG, |
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295 dialog_opt = {C.XMLUI_DATA_TYPE: C.XMLUI_DIALOG_MESSAGE, |
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296 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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297 C.XMLUI_DATA_LVL: C.XMLUI_DATA_LVL_INFO |
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298 }, |
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299 title = _("Fingerprint"), |
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300 ) |
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301 return {'xmlui': dialog.toXml()} |
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302 |
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303 def setTrust(raw_data, profile): |
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304 # This method is called when authentication form is submited |
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305 data = xml_tools.XMLUIResult2DataFormResult(raw_data) |
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306 if data['match'] == 'yes': |
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307 otrctx.setCurrentTrust('verified') |
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308 note_msg = _("Your correspondant {correspondent} is now TRUSTED") |
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309 else: |
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310 otrctx.setCurrentTrust('') |
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311 note_msg = _("Your correspondant {correspondent} is now UNTRUSTED") |
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312 note = xml_tools.XMLUI(C.XMLUI_DIALOG, dialog_opt = { |
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313 C.XMLUI_DATA_TYPE: C.XMLUI_DIALOG_NOTE, |
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314 C.XMLUI_DATA_MESS: note_msg.format(correspondent=otrctx.user.name)} |
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315 ) |
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316 return {'xmlui': note.toXml()} |
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317 |
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318 submit_id = self.host.registerCallback(setTrust, with_data=True, one_shot=True) |
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319 trusted = bool(otrctx.getCurrentTrust()) |
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320 |
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321 xmlui = xml_tools.XMLUI(C.XMLUI_FORM, title=_('Authentication (%s)') % to_jid.full(), submit_id=submit_id) |
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322 xmlui.addText(_(AUTH_TXT)) |
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323 xmlui.addDivider() |
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324 xmlui.addText(_("Your own fingerprint is:\n{fingerprint}").format(fingerprint=priv_key)) |
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325 xmlui.addText(_("Your correspondent fingerprint should be:\n{fingerprint}").format(fingerprint=other_fingerprint)) |
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326 xmlui.addDivider('blank') |
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327 xmlui.changeContainer('pairs') |
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328 xmlui.addLabel(_('Is your correspondent fingerprint the same as here ?')) |
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329 xmlui.addList("match", [('yes', _('yes')),('no', _('no'))], ['yes' if trusted else 'no']) |
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330 return {'xmlui': xmlui.toXml()} |
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331 |
| 1055 | 332 def _receivedTreatment(self, data, profile): |
| 333 from_jid = jid.JID(data['from']) | |
| 1095 | 334 log.debug(u"_receivedTreatment [from_jid = %s]" % from_jid) |
| 1055 | 335 otrctx = self.context_managers[profile].getContextForUser(from_jid) |
| 1095 | 336 encrypted = True |
| 1055 | 337 |
| 338 try: | |
| 1095 | 339 res = otrctx.receiveMessage(data['body'].encode('utf-8')) |
| 1055 | 340 except potr.context.UnencryptedMessage: |
| 1095 | 341 if otrctx.state == potr.context.STATE_ENCRYPTED: |
| 342 log.warning(u"Received unencrypted message in an encrypted context (from %(jid)s)" % {'jid': from_jid.full()}) | |
| 343 client = self.host.getClient(profile) | |
| 344 self.host.bridge.newMessage(from_jid.full(), | |
| 345 _(u"WARNING: received unencrypted data in a supposedly encrypted context"), | |
| 346 mess_type="headline", # FIXME: add message type for internal informations | |
| 347 to_jid=client.jid.full(), | |
| 348 extra={}, | |
| 349 profile=client.profile) | |
| 1055 | 350 encrypted = False |
| 351 | |
| 1095 | 352 if not encrypted: |
| 1055 | 353 return data |
| 354 else: | |
| 355 if res[0] != None: | |
| 356 # decrypted messages handling. | |
| 357 # receiveMessage() will return a tuple, the first part of which will be the decrypted message | |
| 358 data['body'] = res[0].decode('utf-8') | |
| 359 raise failure.Failure(exceptions.SkipHistory()) # we send the decrypted message to frontends, but we don't want it in history | |
| 360 else: | |
| 361 raise failure.Failure(exceptions.CancelError()) # no message at all (no history, no signal) | |
| 362 | |
| 363 def MessageReceivedTrigger(self, message, post_treat, profile): | |
| 364 post_treat.addCallback(self._receivedTreatment, profile) | |
| 365 return True | |
| 366 | |
| 367 def sendMessageTrigger(self, mess_data, pre_xml_treatments, post_xml_treatments, profile): | |
| 368 to_jid = mess_data['to'] | |
| 369 if mess_data['type'] != 'groupchat' and not to_jid.resource: | |
| 370 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 | |
| 371 otrctx = self.context_managers[profile].getContextForUser(to_jid) | |
| 372 if mess_data['type'] != 'groupchat' and otrctx.state == potr.context.STATE_ENCRYPTED: | |
| 1095 | 373 log.debug(u"encrypting message") |
| 374 otrctx.sendMessage(0, mess_data['message'].encode('utf-8')) | |
| 1055 | 375 client = self.host.getClient(profile) |
| 376 self.host.sendMessageToBridge(mess_data, client) | |
| 377 return False | |
| 378 else: | |
| 1095 | 379 log.debug(u"sending message unencrypted") |
| 1055 | 380 return True |
| 381 |