[omemo] Port python-omemo changes from master

omemo/omemo/aes_gcm.py

@@ -18,6 +18,7 @@
 #
 
 
+import sys
 import logging
 log = logging.getLogger('gajim.plugin_system.omemo')
 try:
@@ -35,7 +36,11 @@ def encrypt(key, iv, plaintext):
 
 
 def decrypt(key, iv, ciphertext):
-    return aes_decrypt(key, iv, ciphertext)
+    plaintext = aes_decrypt(key, iv, ciphertext).decode('utf-8')
+    if sys.version_info < (3, 0):
+        return unicode(plaintext)
+    else:
+        return plaintext
 
 
 class NoValidSessions(Exception):

omemo/omemo/aes_gcm_fallback.py

@@ -29,11 +29,14 @@
 # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+import logging
 from struct import pack, unpack
 
 from Crypto.Cipher import AES
 from Crypto.Util import strxor
 
+log = logging.getLogger('gajim.plugin_system.omemo')
+
 
 def gcm_rightshift(vec):
     for x in range(15, 0, -1):
@@ -140,13 +143,20 @@ def gcm_encrypt(k, iv, plaintext, auth_data):
 
 def aes_encrypt(key, nonce, plaintext):
     """ Use AES128 GCM with the given key and iv to encrypt the payload. """
-    c, t = gcm_encrypt(key, nonce, plaintext, '')
-    result = c + t
-    return result
-
+    return gcm_encrypt(key, nonce, plaintext, '')
 
-def aes_decrypt(key, nonce, payload):
+def aes_decrypt(_key, nonce, payload):
     """ Use AES128 GCM with the given key and iv to decrypt the payload. """
-    ciphertext = payload[:-16]
-    mac = payload[-16:]
+    if len(_key) >= 32:
+        # XEP-0384
+        log.debug('XEP Compliant Key/Tag')
+        ciphertext = payload
+        key = _key[:16]
+        mac = _key[16:]
+    else:
+        # Legacy
+        log.debug('Legacy Key/Tag')
+        ciphertext = payload[:-16]
+        key = _key
+        mac = payload[-16:]
     return gcm_decrypt(key, nonce, ciphertext, '', mac)

omemo/omemo/aes_gcm_native.py

@@ -19,6 +19,7 @@
 
 
 import os
+import logging
 from cryptography.hazmat.primitives.ciphers import Cipher
 from cryptography.hazmat.primitives.ciphers import algorithms
 from cryptography.hazmat.primitives.ciphers.modes import GCM
@@ -32,11 +33,22 @@ if os.name == 'nt':
 else:
     from cryptography.hazmat.backends import default_backend
 
+log = logging.getLogger('gajim.plugin_system.omemo')
 
-def aes_decrypt(key, iv, payload):
+def aes_decrypt(_key, iv, payload):
     """ Use AES128 GCM with the given key and iv to decrypt the payload. """
-    data = payload[:-16]
-    tag = payload[-16:]
+    if len(_key) >= 32:
+        # XEP-0384
+        log.debug('XEP Compliant Key/Tag')
+        data = payload
+        key = _key[:16]
+        tag = _key[16:]
+    else:
+        # Legacy
+        log.debug('Legacy Key/Tag')
+        data = payload[:-16]
+        key = _key
+        tag = payload[-16:]
     if os.name == 'nt':
         _backend = backend
     else:
@@ -58,4 +70,4 @@ def aes_encrypt(key, iv, plaintext):
         algorithms.AES(key),
         GCM(iv),
         backend=_backend).encryptor()
-    return encryptor.update(plaintext) + encryptor.finalize() + encryptor.tag
+    return encryptor.update(plaintext) + encryptor.finalize(), encryptor.tag

omemo/omemo/liteaxolotlstore.py

@@ -83,10 +83,16 @@ class LiteAxolotlStore(AxolotlStore):
     def saveIdentity(self, recepientId, identityKey):
         self.identityKeyStore.saveIdentity(recepientId, identityKey)
 
+    def deleteIdentity(self, recipientId, identityKey):
+        self.identityKeyStore.deleteIdentity(recipientId, identityKey)
+
     def isTrustedIdentity(self, recepientId, identityKey):
         return self.identityKeyStore.isTrustedIdentity(recepientId,
                                                        identityKey)
 
+    def setTrust(self, identityKey, trust):
+        return self.identityKeyStore.setTrust(identityKey, trust)
+
     def getTrustedFingerprints(self, jid):
         return self.identityKeyStore.getTrustedFingerprints(jid)
 
@@ -127,6 +133,9 @@ class LiteAxolotlStore(AxolotlStore):
         # TODO Reuse this
         return self.sessionStore.getSubDeviceSessions(recepientId)
 
+    def getJidFromDevice(self, device_id):
+        return self.sessionStore.getJidFromDevice(device_id)
+
     def storeSession(self, recepientId, deviceId, sessionRecord):
         self.sessionStore.storeSession(recepientId, deviceId, sessionRecord)
 
@@ -139,6 +148,15 @@ class LiteAxolotlStore(AxolotlStore):
     def deleteAllSessions(self, recepientId):
         self.sessionStore.deleteAllSessions(recepientId)
 
+    def getSessionsFromJid(self, recipientId):
+        return self.sessionStore.getSessionsFromJid(recipientId)
+
+    def getSessionsFromJids(self, recipientId):
+        return self.sessionStore.getSessionsFromJids(recipientId)
+
+    def getAllSessions(self):
+        return self.sessionStore.getAllSessions()
+
     def loadSignedPreKey(self, signedPreKeyId):
         return self.signedPreKeyStore.loadSignedPreKey(signedPreKeyId)
 

omemo/omemo/liteidentitykeystore.py

@@ -86,6 +86,13 @@ class LiteIdentityKeyStore(IdentityKeyStore):
 
         return result is not None
 
+    def deleteIdentity(self, recipientId, identityKey):
+        q = "DELETE FROM identities WHERE recipient_id = ? AND public_key = ?"
+        c = self.dbConn.cursor()
+        c.execute(q, (recipientId,
+                      identityKey.getPublicKey().serialize()))
+        self.dbConn.commit()
+
     def isTrustedIdentity(self, recipientId, identityKey):
         q = "SELECT trust FROM identities WHERE recipient_id = ? " \
             "AND public_key = ?"
@@ -160,8 +167,8 @@ class LiteIdentityKeyStore(IdentityKeyStore):
         c.execute(q, fingerprints)
         self.dbConn.commit()
 
-    def setTrust(self, _id, trust):
-        q = "UPDATE identities SET trust = ? WHERE _id = ?"
+    def setTrust(self, identityKey, trust):
+        q = "UPDATE identities SET trust = ? WHERE public_key = ?"
         c = self.dbConn.cursor()
-        c.execute(q, (trust, _id))
+        c.execute(q, (trust, identityKey.getPublicKey().serialize()))
         self.dbConn.commit()

omemo/omemo/litesessionstore.py

@@ -48,6 +48,14 @@ class LiteSessionStore(SessionStore):
         deviceIds = [r[0] for r in result]
         return deviceIds
 
+    def getJidFromDevice(self, device_id):
+        q = "SELECT recipient_id from sessions WHERE device_id = ?"
+        c = self.dbConn.cursor()
+        c.execute(q, (device_id, ))
+        result = c.fetchone()
+
+        return result[0].decode('utf-8')
+
     def getActiveDeviceTuples(self):
         q = "SELECT recipient_id, device_id FROM sessions WHERE active = 1"
         c = self.dbConn.cursor()
@@ -82,6 +90,33 @@ class LiteSessionStore(SessionStore):
         self.dbConn.cursor().execute(q, (recipientId, ))
         self.dbConn.commit()
 
+    def getAllSessions(self):
+        q = "SELECT _id, recipient_id, device_id, record, active from sessions"
+        c = self.dbConn.cursor()
+        result = []
+        for row in c.execute(q):
+            result.append((row[0], row[1].decode('utf-8'), row[2], row[3], row[4]))
+        return result
+
+    def getSessionsFromJid(self, recipientId):
+        q = "SELECT _id, recipient_id, device_id, record, active from sessions" \
+            " WHERE recipient_id = ?"
+        c = self.dbConn.cursor()
+        result = []
+        for row in c.execute(q, (recipientId,)):
+            result.append((row[0], row[1].decode('utf-8'), row[2], row[3], row[4]))
+        return result
+
+    def getSessionsFromJids(self, recipientId):
+        q = "SELECT _id, recipient_id, device_id, record, active from sessions" \
+            " WHERE recipient_id IN ({})" \
+            .format(', '.join(['?'] * len(recipientId)))
+        c = self.dbConn.cursor()
+        result = []
+        for row in c.execute(q, recipientId):
+            result.append((row[0], row[1].decode('utf-8'), row[2], row[3], row[4]))
+        return result
+
     def setActiveState(self, deviceList, jid):
         c = self.dbConn.cursor()
 
@@ -96,28 +131,6 @@ class LiteSessionStore(SessionStore):
         c.execute(q, deviceList)
         self.dbConn.commit()
 
-    def getActiveSessionsKeys(self, recipientId):
-        q = "SELECT record FROM sessions WHERE active = 1 AND recipient_id = ?"
-        c = self.dbConn.cursor()
-        result = []
-        for row in c.execute(q, (recipientId,)):
-            public_key = (SessionRecord(serialized=row[0]).
-                          getSessionState().getRemoteIdentityKey().
-                          getPublicKey())
-            result.append(public_key.serialize())
-        return result
-
-    def getAllActiveSessionsKeys(self):
-        q = "SELECT record FROM sessions WHERE active = 1"
-        c = self.dbConn.cursor()
-        result = []
-        for row in c.execute(q):
-            public_key = (SessionRecord(serialized=row[0]).
-                          getSessionState().getRemoteIdentityKey().
-                          getPublicKey())
-            result.append(public_key.serialize())
-        return result
-
     def getInactiveSessionsKeys(self, recipientId):
         q = "SELECT record FROM sessions WHERE active = 0 AND recipient_id = ?"
         c = self.dbConn.cursor()

omemo/omemo/sql.py

@@ -29,6 +29,14 @@ class SQLDatabase():
         self.dbConn = dbConn
         self.createDb()
         self.migrateDb()
+        c = self.dbConn.cursor()
+        c.execute("PRAGMA synchronous=NORMAL;")
+        c.execute("PRAGMA journal_mode;")
+        mode = c.fetchone()[0]
+        # WAL is a persistent DB mode, dont override it if user has set it
+        if mode != 'wal':
+            c.execute("PRAGMA journal_mode=MEMORY;")
+        self.dbConn.commit()
 
     def createDb(self):
         if user_version(self.dbConn) == 0:

omemo/omemo/state.py

@@ -200,8 +200,8 @@ class OmemoState:
                 key = self.handleWhisperMessage(sender_jid, sid, encrypted_key)
             except (NoSessionException, InvalidMessageException) as e:
                 log.warning('No Session found ' + e.message)
-                log.warning('sender_jid =>  ' + str(sender_jid) +
-                            ' sid =>' + sid)
+                log.warning('sender_jid =>  ' + str(sender_jid) + ' sid =>' +
+                            str(sid))
                 return
             except (DuplicateMessageException) as e:
                 log.warning('Duplicate message found ' + str(e.args))
@@ -211,7 +211,7 @@ class OmemoState:
             log.warning('Duplicate message found ' + str(e.args))
             return
 
-        result = decrypt(key, iv, payload).decode('utf-8')
+        result = decrypt(key, iv, payload)
 
         log.debug("Decrypted Message => " + result)
         return result
@@ -226,24 +226,97 @@ class OmemoState:
             log.error('No known devices')
             return
 
-        for dev in devices_list:
-            self.get_session_cipher(jid, dev)
-        session_ciphers = self.session_ciphers[jid]
-        if not session_ciphers:
-            log.warning('No session ciphers for ' + jid)
-            return
+        payload, tag = encrypt(key, iv, plaintext)
+
+        # for XEP-384 Compliance uncomment
+        # key += tag
+        payload += tag
 
         # Encrypt the message key with for each of receivers devices
-        for rid, cipher in session_ciphers.items():
+        for device in devices_list:
             try:
-                if self.isTrusted(cipher) == TRUSTED:
-                    encrypted_keys[rid] = cipher.encrypt(key).serialize()
+                if self.isTrusted(jid, device) == TRUSTED:
+                    cipher = self.get_session_cipher(jid, device)
+                    cipher_key = cipher.encrypt(key)
+                    prekey = isinstance(cipher_key, PreKeyWhisperMessage)
+                    encrypted_keys[device] = (cipher_key.serialize(), prekey)
                 else:
                     log.debug('Skipped Device because Trust is: ' +
-                              str(self.isTrusted(cipher)))
+                              str(self.isTrusted(jid, device)))
             except:
-                log.warning('Failed to find key for device ' + str(rid))
+                log.warning('Failed to find key for device ' + str(device))
 
+        if len(encrypted_keys) == 0:
+            log.error('Encrypted keys empty')
+            raise NoValidSessions('Encrypted keys empty')
+
+        my_other_devices = set(self.own_devices) - set({self.own_device_id})
+        # Encrypt the message key with for each of our own devices
+        for device in my_other_devices:
+            try:
+                if self.isTrusted(from_jid, device) == TRUSTED:
+                    cipher = self.get_session_cipher(from_jid, device)
+                    cipher_key = cipher.encrypt(key)
+                    prekey = isinstance(cipher_key, PreKeyWhisperMessage)
+                    encrypted_keys[device] = (cipher_key.serialize(), prekey)
+                else:
+                    log.debug('Skipped own Device because Trust is: ' +
+                              str(self.isTrusted(from_jid, device)))
+            except:
+                log.warning('Failed to find key for device ' + str(device))
+
+        result = {'sid': self.own_device_id,
+                  'keys': encrypted_keys,
+                  'jid': jid,
+                  'iv': iv,
+                  'payload': payload}
+
+        log.debug('Finished encrypting message')
+        return result
+
+    def create_gc_msg(self, from_jid, jid, plaintext):
+        key = get_random_bytes(16)
+        iv = get_random_bytes(16)
+        encrypted_keys = {}
+        room = jid
+        encrypted_jids = []
+
+        devices_list = self.device_list_for(jid, True)
+
+        if len(devices_list) == 0:
+            log.error('No known devices')
+            return
+
+        payload, tag = encrypt(key, iv, plaintext)
+
+        # for XEP-384 Compliance uncomment
+        # key += tag
+        payload += tag
+
+        for tup in devices_list:
+            self.get_session_cipher(tup[0], tup[1])
+
+        # Encrypt the message key with for each of receivers devices
+        for nick in self.plugin.groupchat[room]:
+            jid_to = self.plugin.groupchat[room][nick]
+            if jid_to == self.own_jid:
+                continue
+            if jid_to in encrypted_jids:  # We already encrypted to this JID
+                continue
+            for rid, cipher in self.session_ciphers[jid_to].items():
+                try:
+                    if self.isTrusted(jid_to, rid) == TRUSTED:
+                        cipher_key = cipher.encrypt(key)
+                        prekey = isinstance(cipher_key, PreKeyWhisperMessage)
+                        encrypted_keys[rid] = (cipher_key.serialize(), prekey)
+                    else:
+                        log.debug('Skipped Device because Trust is: ' +
+                                  str(self.isTrusted(jid_to, rid)))
+                except:
+                    log.exception('ERROR:')
+                    log.warning('Failed to find key for device ' +
+                                str(rid))
+            encrypted_jids.append(jid_to)
         if len(encrypted_keys) == 0:
             log_msg = 'Encrypted keys empty'
             log.error(log_msg)
@@ -254,16 +327,17 @@ class OmemoState:
         for dev in my_other_devices:
             try:
                 cipher = self.get_session_cipher(from_jid, dev)
-                if self.isTrusted(cipher) == TRUSTED:
-                    encrypted_keys[dev] = cipher.encrypt(key).serialize()
+                if self.isTrusted(from_jid, dev) == TRUSTED:
+                    cipher_key = cipher.encrypt(key)
+                    prekey = isinstance(cipher_key, PreKeyWhisperMessage)
+                    encrypted_keys[dev] = (cipher_key.serialize(), prekey)
                 else:
                     log.debug('Skipped own Device because Trust is: ' +
-                              str(self.isTrusted(cipher)))
+                              str(self.isTrusted(from_jid, dev)))
             except:
+                log.exception('ERROR:')
                 log.warning('Failed to find key for device ' + str(dev))
 
-        payload = encrypt(key, iv, plaintext)
-
         result = {'sid': self.own_device_id,
                   'keys': encrypted_keys,
                   'jid': jid,
@@ -273,14 +347,36 @@ class OmemoState:
         log.debug('Finished encrypting message')
         return result
 
-    def isTrusted(self, cipher):
-        self.cipher = cipher
-        self.state = self.cipher.sessionStore. \
-            loadSession(self.cipher.recipientId, self.cipher.deviceId). \
-            getSessionState()
-        self.key = self.state.getRemoteIdentityKey()
-        return self.store.identityKeyStore. \
-            isTrustedIdentity(self.cipher.recipientId, self.key)
+    def device_list_for(self, jid, gc=False):
+        """ Return a list of known device ids for the specified jid.
+            Parameters
+            ----------
+            jid : string
+                The contacts jid
+            gc : bool
+                Groupchat Message
+        """
+        if gc:
+            room = jid
+            devicelist = []
+            for nick in self.plugin.groupchat[room]:
+                jid_to = self.plugin.groupchat[room][nick]
+                if jid_to == self.own_jid:
+                    continue
+                for device in self.device_ids[jid_to]:
+                    devicelist.append((jid_to, device))
+            return devicelist
+
+        if jid == self.own_jid:
+            return set(self.own_devices) - set({self.own_device_id})
+        if jid not in self.device_ids:
+            return set()
+        return set(self.device_ids[jid])
+
+    def isTrusted(self, recipient_id, device_id):
+        record = self.store.loadSession(recipient_id, device_id)
+        identity_key = record.getSessionState().getRemoteIdentityKey()
+        return self.store.isTrustedIdentity(recipient_id, identity_key)
 
     def getTrustedFingerprints(self, recipient_id):
         inactive = self.store.getInactiveSessionsKeys(recipient_id)
@@ -296,20 +392,6 @@ class OmemoState:
 
         return undecided
 
-    def device_list_for(self, jid):
-        """ Return a list of known device ids for the specified jid.
-
-            Parameters
-            ----------
-            jid : string
-                The contacts jid
-        """
-        if jid == self.own_jid:
-            return set(self.own_devices) - set({self.own_device_id})
-        if jid not in self.device_ids:
-            return set()
-        return set(self.device_ids[jid])
-
     def devices_without_sessions(self, jid):
         """ List device_ids for the given jid which have no axolotl session.
 
@@ -364,10 +446,10 @@ class OmemoState:
 
     def handleWhisperMessage(self, recipient_id, device_id, key):
         whisperMessage = WhisperMessage(serialized=key)
-        sessionCipher = self.get_session_cipher(recipient_id, device_id)
         log.debug(self.account + " => Received WhisperMessage from " +
                   recipient_id)
-        if self.isTrusted(sessionCipher) >= TRUSTED:
+        if self.isTrusted(recipient_id, device_id):
+            sessionCipher = self.get_session_cipher(recipient_id, device_id)
             key = sessionCipher.decryptMsg(whisperMessage, textMsg=False)
             return key
         else: