Mercurial > libervia-backend
annotate src/plugins/plugin_sec_otr.py @ 1134:8def4a3f55c2
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)
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Mon, 25 Aug 2014 21:32:23 +0200 |
| parents | ef7b7dd5c5db |
| children | 3158f9e08760 |
| 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 | |
| 23 from sat.core.i18n import _ | |
| 24 from sat.core.log import getLogger | |
| 25 from sat.core import exceptions | |
| 26 log = getLogger(__name__) | |
| 27 from twisted.words.protocols.jabber import jid | |
| 28 from twisted.python import failure | |
| 1095 | 29 from twisted.internet import defer |
| 1055 | 30 import potr |
| 1095 | 31 from sat.memory import persistent |
| 32 | |
| 33 NS_OTR = "otr_plugin" | |
| 34 PRIVATE_KEY = "PRIVATE KEY" | |
| 1055 | 35 |
| 36 DEFAULT_POLICY_FLAGS = { | |
| 37 'ALLOW_V1':False, | |
| 38 'ALLOW_V2':True, | |
| 39 'REQUIRE_ENCRYPTION':True, | |
| 40 } | |
| 41 | |
| 42 PLUGIN_INFO = { | |
| 43 "name": "OTR", | |
| 44 "import_name": "OTR", | |
| 45 "type": "SEC", | |
| 46 "protocols": [], | |
| 47 "dependencies": [], | |
| 48 "main": "OTR", | |
| 49 "handler": "no", | |
| 50 "description": _("""Implementation of OTR""") | |
| 51 } | |
| 52 | |
| 53 | |
| 54 class Context(potr.context.Context): | |
| 55 | |
| 1095 | 56 def __init__(self, host, account, other_jid): |
| 57 super(Context, self).__init__(account, other_jid) | |
| 1055 | 58 self.host = host |
| 59 | |
| 60 def getPolicy(self, key): | |
| 61 if key in DEFAULT_POLICY_FLAGS: | |
| 62 return DEFAULT_POLICY_FLAGS[key] | |
| 63 else: | |
| 64 return False | |
| 65 | |
| 1095 | 66 def inject(self, msg_str, appdata=None): |
| 67 assert isinstance(self.peer, jid.JID) | |
| 68 msg = msg_str.decode('utf-8') | |
| 69 client = self.user.client | |
| 70 log.debug(u'inject(%s, appdata=%s, to=%s)' % (msg, appdata, self.peer)) | |
| 1055 | 71 mess_data = {'message': msg, |
| 72 'type': 'chat', | |
| 73 'from': client.jid, | |
| 1095 | 74 'to': self.peer, |
| 1055 | 75 'subject': None, |
| 76 } | |
| 77 self.host.generateMessageXML(mess_data) | |
| 78 client.xmlstream.send(mess_data['xml']) | |
| 79 | |
| 80 def setState(self, state): | |
| 1095 | 81 old_state = self.state |
| 1055 | 82 super(Context, self).setState(state) |
| 1095 | 83 log.debug(u"setState: %s (old_state=%s) " % (state, old_state)) |
| 84 | |
| 85 if state == potr.context.STATE_PLAINTEXT: | |
| 86 feedback = _(u"/!\\ conversation with %(other_jid)s is now UNENCRYPTED") % {'other_jid': self.peer.full()} | |
| 87 elif state == potr.context.STATE_ENCRYPTED: | |
| 88 try: | |
| 89 fingerprint, trusted = self.getCurrentTrust() | |
| 90 except TypeError: | |
| 91 trusted = False | |
| 92 trusted_str = _(u"trusted") if trusted else _(u"untrusted") | |
| 93 | |
| 94 if old_state == potr.context.STATE_ENCRYPTED: | |
| 95 feedback = _(u"%(trusted)s OTR conversation with %(other_jid)s REFRESHED") % {'trusted': trusted_str, 'other_jid': self.peer.full()} | |
| 96 else: | |
| 97 feedback = _(u"%(trusted)s Encrypted OTR conversation started with %(other_jid)s") % {'trusted': trusted_str, 'other_jid': self.peer.full()} | |
| 98 elif state == potr.context.STATE_FINISHED: | |
| 99 feedback = _(u"OTR conversation with %(other_jid)s is FINISHED") % {'other_jid': self.peer.full()} | |
| 100 else: | |
| 101 log.error(_(u"Unknown OTR state")) | |
| 102 return | |
| 103 | |
| 104 client = self.user.client | |
| 105 # FIXME: newMessage should manage system message, so they don't appear as coming from the contact | |
| 106 self.host.bridge.newMessage(client.jid.full(), | |
| 107 feedback, | |
| 108 mess_type="headline", | |
| 109 to_jid=self.peer.full(), | |
| 110 extra={}, | |
| 111 profile=client.profile) | |
| 112 # TODO: send signal to frontends | |
| 1055 | 113 |
| 114 | |
| 115 class Account(potr.context.Account): | |
| 116 | |
| 1095 | 117 def __init__(self, host, client): |
| 118 log.debug(u"new account: %s" % client.jid) | |
| 119 super(Account, self).__init__(client.jid, "xmpp", 1024) | |
| 120 self.host = host | |
| 121 self.client = client | |
| 1055 | 122 |
| 123 def loadPrivkey(self): | |
| 1095 | 124 log.debug(u"loadPrivkey") |
| 125 return self.client.otr_priv_key | |
| 1055 | 126 |
| 127 def savePrivkey(self): | |
| 1095 | 128 log.debug(u"savePrivkey") |
| 129 priv_key = self.getPrivkey().serializePrivateKey() | |
| 130 d = self.host.memory.encryptValue(priv_key, self.client.profile) | |
| 131 def save_encrypted_key(encrypted_priv_key): | |
| 132 self.client.otr_data[PRIVATE_KEY] = encrypted_priv_key | |
| 133 d.addCallback(save_encrypted_key) | |
| 1055 | 134 |
| 135 | |
| 136 class ContextManager(object): | |
| 137 | |
| 138 def __init__(self, host, client): | |
| 139 self.host = host | |
| 1095 | 140 self.account = Account(host, client) |
| 1055 | 141 self.contexts = {} |
| 142 | |
| 1095 | 143 def startContext(self, other_jid): |
| 144 assert isinstance(other_jid, jid.JID) | |
| 145 context = self.contexts.setdefault(other_jid, Context(self.host, self.account, other_jid)) | |
| 146 return context | |
| 1055 | 147 |
| 148 def getContextForUser(self, other): | |
| 1095 | 149 log.debug(u"getContextForUser [%s]" % other) |
| 1055 | 150 return self.startContext(other) |
| 151 | |
| 152 | |
| 153 class OTR(object): | |
| 154 | |
| 155 def __init__(self, host): | |
| 1095 | 156 log.info(_(u"OTR plugin initialization")) |
|
1134
8def4a3f55c2
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>
parents:
1095
diff
changeset
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157 self._fixPotr() # FIXME: to be removed when potr will be fixed |
| 1055 | 158 self.host = host |
| 159 self.context_managers = {} | |
| 160 host.trigger.add("MessageReceived", self.MessageReceivedTrigger, priority=100000) | |
| 161 host.trigger.add("sendMessage", self.sendMessageTrigger, priority=100000) | |
| 162 | |
|
1134
8def4a3f55c2
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>
parents:
1095
diff
changeset
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163 def _fixPotr(self): |
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8def4a3f55c2
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>
parents:
1095
diff
changeset
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164 # FIXME: potr fix for bad unicode handling |
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8def4a3f55c2
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>
parents:
1095
diff
changeset
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165 # this method monkeypatch it, must be removed when potr |
|
8def4a3f55c2
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>
parents:
1095
diff
changeset
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166 # is fixed |
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8def4a3f55c2
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>
parents:
1095
diff
changeset
|
167 |
|
8def4a3f55c2
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>
parents:
1095
diff
changeset
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168 def getDefaultQueryMessage(self, policy): |
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8def4a3f55c2
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>
parents:
1095
diff
changeset
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169 defaultQuery = '?OTRv{versions}?\nI would like to start ' \ |
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8def4a3f55c2
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>
parents:
1095
diff
changeset
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170 'an Off-the-Record private conversation. However, you ' \ |
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8def4a3f55c2
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>
parents:
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diff
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171 'do not have a plugin to support that.\nSee '\ |
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8def4a3f55c2
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>
parents:
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172 'https://otr.cypherpunks.ca/ for more information.' |
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8def4a3f55c2
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>
parents:
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diff
changeset
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173 v = '2' if policy('ALLOW_V2') else '' |
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8def4a3f55c2
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>
parents:
1095
diff
changeset
|
174 msg = defaultQuery.format(versions=v) |
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8def4a3f55c2
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>
parents:
1095
diff
changeset
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175 return msg.encode('ascii') |
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8def4a3f55c2
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>
parents:
1095
diff
changeset
|
176 |
|
8def4a3f55c2
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>
parents:
1095
diff
changeset
|
177 potr.context.Account.getDefaultQueryMessage = getDefaultQueryMessage |
|
8def4a3f55c2
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>
parents:
1095
diff
changeset
|
178 |
| 1095 | 179 @defer.inlineCallbacks |
| 1055 | 180 def profileConnected(self, profile): |
| 181 client = self.host.getClient(profile) | |
| 182 self.context_managers[profile] = ContextManager(self.host, client) | |
| 1095 | 183 client.otr_data = persistent.PersistentBinaryDict(NS_OTR, profile) |
| 184 yield client.otr_data.load() | |
| 185 encrypted_priv_key = client.otr_data.get(PRIVATE_KEY, None) | |
| 186 if encrypted_priv_key is not None: | |
| 187 priv_key = yield self.host.memory.decryptValue(encrypted_priv_key, profile) | |
| 188 client.otr_priv_key = potr.crypt.PK.parsePrivateKey(priv_key)[0] | |
| 189 else: | |
| 190 client.otr_priv_key = None | |
| 1055 | 191 |
| 192 def _receivedTreatment(self, data, profile): | |
| 193 from_jid = jid.JID(data['from']) | |
| 1095 | 194 log.debug(u"_receivedTreatment [from_jid = %s]" % from_jid) |
| 1055 | 195 otrctx = self.context_managers[profile].getContextForUser(from_jid) |
| 1095 | 196 encrypted = True |
| 1055 | 197 |
| 198 try: | |
| 1095 | 199 res = otrctx.receiveMessage(data['body'].encode('utf-8')) |
| 1055 | 200 except potr.context.UnencryptedMessage: |
| 1095 | 201 if otrctx.state == potr.context.STATE_ENCRYPTED: |
| 202 log.warning(u"Received unencrypted message in an encrypted context (from %(jid)s)" % {'jid': from_jid.full()}) | |
| 203 client = self.host.getClient(profile) | |
| 204 self.host.bridge.newMessage(from_jid.full(), | |
| 205 _(u"WARNING: received unencrypted data in a supposedly encrypted context"), | |
| 206 mess_type="headline", # FIXME: add message type for internal informations | |
| 207 to_jid=client.jid.full(), | |
| 208 extra={}, | |
| 209 profile=client.profile) | |
| 1055 | 210 encrypted = False |
| 211 | |
| 1095 | 212 if not encrypted: |
| 1055 | 213 return data |
| 214 else: | |
| 215 if res[0] != None: | |
| 216 # decrypted messages handling. | |
| 217 # receiveMessage() will return a tuple, the first part of which will be the decrypted message | |
| 218 data['body'] = res[0].decode('utf-8') | |
| 219 raise failure.Failure(exceptions.SkipHistory()) # we send the decrypted message to frontends, but we don't want it in history | |
| 220 else: | |
| 221 raise failure.Failure(exceptions.CancelError()) # no message at all (no history, no signal) | |
| 222 | |
| 223 def MessageReceivedTrigger(self, message, post_treat, profile): | |
| 224 post_treat.addCallback(self._receivedTreatment, profile) | |
| 225 return True | |
| 226 | |
| 227 def sendMessageTrigger(self, mess_data, pre_xml_treatments, post_xml_treatments, profile): | |
| 228 to_jid = mess_data['to'] | |
| 229 if mess_data['type'] != 'groupchat' and not to_jid.resource: | |
| 230 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 | |
| 231 otrctx = self.context_managers[profile].getContextForUser(to_jid) | |
| 232 if mess_data['type'] != 'groupchat' and otrctx.state == potr.context.STATE_ENCRYPTED: | |
| 1095 | 233 log.debug(u"encrypting message") |
| 234 otrctx.sendMessage(0, mess_data['message'].encode('utf-8')) | |
| 1055 | 235 client = self.host.getClient(profile) |
| 236 self.host.sendMessageToBridge(mess_data, client) | |
| 237 return False | |
| 238 else: | |
| 1095 | 239 log.debug(u"sending message unencrypted") |
| 1055 | 240 return True |
| 241 |