Merge branch 'develop' of ssh://leap.se/leap_client into develop

13 files changed, 765 insertions, 419 deletions

diff --git a/.gitignore b/.gitignore
index 9a52e919..a9b7c1c8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,3 +24,4 @@ src/*.egg-info
 pkg/osx/dist
 pkg/osx/build
 MANIFEST
+_trial_temp*
diff --git a/src/leap/email/__init__.py b/src/leap/email/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/leap/email/__init__.py
diff --git a/src/leap/email/smtp/README b/src/leap/email/smtp/README
new file mode 100644
index 00000000..a351dcec
--- /dev/null
+++ b/src/leap/email/smtp/README
@@ -0,0 +1,41 @@
+Leap SMTP Relay
+===============
+
+Outgoing mail workflow:
+
+    * LEAP client runs a thin SMTP proxy on the user's device, bound to
+      localhost.
+    * User's MUA is configured outgoing SMTP to localhost
+    * When SMTP proxy receives an email from MUA
+        * SMTP proxy queries Key Manager for the user's private key and public
+          keys of all recipients
+        * Message is signed by sender and encrypted to recipients.
+        * If recipient's key is missing, email goes out in cleartext (unless
+          user has configured option to send only encrypted email)
+        * Finally, message is relayed to provider's SMTP relay
+
+
+Dependencies
+------------
+
+Leap SMTP Relay depends on the following python libraries:
+
+  * Twisted 12.3.0 [1]
+
+[1] http://pypi.python.org/pypi/Twisted/12.3.0
+
+
+How to run
+----------
+
+To launch the SMTP relay, run the following command:
+
+  twistd -y smtprelay.tac
+
+
+Running tests
+-------------
+
+Tests are run using Twisted's Trial API, like this:
+
+  trial leap.email.smtp.tests
diff --git a/src/leap/email/smtp/__init__.py b/src/leap/email/smtp/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/leap/email/smtp/__init__.py
diff --git a/src/leap/email/smtp/smtprelay.py b/src/leap/email/smtp/smtprelay.py
new file mode 100644
index 00000000..f44aeb6f
--- /dev/null
+++ b/src/leap/email/smtp/smtprelay.py
@@ -0,0 +1,203 @@
+import re
+import gnupg
+from zope.interface import implements
+from StringIO import StringIO
+from twisted.mail import smtp
+from twisted.internet.protocol import ServerFactory
+from twisted.internet import reactor
+from twisted.internet import defer
+from twisted.application import internet, service
+from twisted.python import log
+from email.Header import Header
+
+
+class SMTPFactory(ServerFactory):
+    """
+    Factory for an SMTP server with encrypted relaying capabilities.
+    """
+
+    def __init__(self, gpg=None):
+        self._gpg = gpg
+
+    def buildProtocol(self, addr):
+        "Return a protocol suitable for the job."
+        # TODO: use ESMTP here.
+        smtpProtocol = smtp.SMTP(SMTPDelivery(self._gpg))
+        smtpProtocol.factory = self
+        return smtpProtocol
+
+
+class SMTPDelivery(object):
+    """
+    Validate email addresses and handle message delivery.
+    """
+
+    implements(smtp.IMessageDelivery)
+
+    def __init__(self, gpg=None):
+        if gpg:
+            self._gpg = gpg
+        else:
+            self._gpg = GPGWrapper()
+    
+    def receivedHeader(self, helo, origin, recipients):
+        myHostname, clientIP = helo
+        headerValue = "by %s from %s with ESMTP ; %s" % (
+            myHostname, clientIP, smtp.rfc822date( ))
+        # email.Header.Header used for automatic wrapping of long lines
+        return "Received: %s" % Header(headerValue)
+
+    def validateTo(self, user):
+        """Assert existence of and trust on recipient's GPG public key."""
+        # try to find recipient's public key
+        try:
+            # this will raise an exception if key is not found
+            trust = self._gpg.find_key(user.dest.addrstr)['trust']
+            # if key is not ultimatelly trusted, then the message will not
+            # be encrypted. So, we check for this below
+            #if trust != 'u':
+            #    raise smtp.SMTPBadRcpt(user)
+            log.msg("Accepting mail for %s..." % user.dest)
+            return lambda: EncryptedMessage(user, gpg=self._gpg)
+        except LookupError:
+            raise smtp.SMTPBadRcpt(user)
+
+    def validateFrom(self, helo, originAddress):
+        # accept mail from anywhere. To reject an address, raise
+        # smtp.SMTPBadSender here.
+        return originAddress
+
+
+class EncryptedMessage():
+    """
+    Receive plaintext from client, encrypt it and send message to a
+    recipient.
+    """
+    implements(smtp.IMessage)
+
+    SMTP_HOSTNAME = "mail.riseup.net"
+    SMTP_PORT     = 25
+
+    def __init__(self, user, gpg=None):
+        self.user = user
+        self.getSMTPInfo()
+        self.lines = []
+        if gpg:
+            self._gpg = gpg
+        else:
+            self._gpg = GPGWrapper()
+
+    def lineReceived(self, line):
+        """Store email DATA lines as they arrive."""
+        self.lines.append(line)
+
+    def eomReceived(self):
+        """Encrypt and send message."""
+        log.msg("Message data complete.")
+        self.lines.append('') # add a trailing newline
+        self.parseMessage()
+        try:
+            self.encrypt()
+            return self.sendMessage()
+        except LookupError:
+            return None
+
+    def parseMessage(self):
+        """Separate message headers from body."""
+        sep = self.lines.index('')
+        self.headers = self.lines[:sep]
+        self.body = self.lines[sep+1:]
+
+    def connectionLost(self):
+        log.msg("Connection lost unexpectedly!")
+        log.err()
+        # unexpected loss of connection; don't save
+        self.lines = []
+
+    def sendSuccess(self, r):
+        log.msg(r)
+
+    def sendError(self, e):
+        log.msg(e)
+        log.err()
+
+    def prepareHeader(self):
+        self.headers.insert(1, "From: %s" % self.user.orig.addrstr)
+        self.headers.insert(2, "To: %s" % self.user.dest.addrstr)
+        self.headers.append('')
+
+    def sendMessage(self):
+        self.prepareHeader()
+        msg = '\n'.join(self.headers+[self.cyphertext])
+        d = defer.Deferred()
+        factory = smtp.ESMTPSenderFactory(self.smtp_username,
+                                          self.smtp_password,
+                                          self.smtp_username,
+                                          self.user.dest.addrstr,
+                                          StringIO(msg),
+                                          d)
+        # the next call is TSL-powered!
+        reactor.connectTCP(self.SMTP_HOSTNAME, self.SMTP_PORT, factory)
+        d.addCallback(self.sendSuccess)
+        d.addErrback(self.sendError)
+        return d
+
+    def encrypt(self, always_trust=True):
+        # TODO: do not "always trust" here.
+        fp = self._gpg.find_key(self.user.dest.addrstr)['fingerprint']
+        log.msg("Encrypting to %s" % fp)
+        self.cyphertext = str(self._gpg.encrypt('\n'.join(self.body), [fp],
+                                                always_trust=always_trust))
+    
+    # this will be replaced by some other mechanism of obtaining credentials
+    # for SMTP server.
+    def getSMTPInfo(self):
+        f = open('/media/smtp-info.txt', 'r')
+        self.smtp_host = f.readline().rstrip()
+        self.smtp_port = f.readline().rstrip()
+        self.smtp_username = f.readline().rstrip()
+        self.smtp_password = f.readline().rstrip()
+        f.close()
+
+
+class GPGWrapper():
+    """
+    This is a temporary class for handling GPG requests, and should be
+    replaced by a more general class used throughout the project.
+    """
+
+    GNUPG_HOME    = "~/.config/leap/gnupg"
+    GNUPG_BINARY  = "/usr/bin/gpg" # this has to be changed based on OS
+
+    def __init__(self, gpghome=GNUPG_HOME, gpgbinary=GNUPG_BINARY):
+        self.gpg = gnupg.GPG(gnupghome=gpghome, gpgbinary=gpgbinary)
+
+    def find_key(self, email):
+        """
+        Find user's key based on their email.
+        """
+        for key in self.gpg.list_keys():
+            for uid in key['uids']:
+                if re.search(email, uid):
+                    return key
+        raise LookupError("GnuPG public key for %s not found!" % email)
+
+    def encrypt(self, data, recipient, always_trust=True):
+        # TODO: do not 'always_trust'.
+        return self.gpg.encrypt(data, recipient, always_trust=always_trust)
+
+    def decrypt(self, data):
+        return self.gpg.decrypt(data)
+
+    def import_keys(self, data):
+        return self.gpg.import_keys(data)
+
+
+# service configuration
+port = 25
+factory = SMTPFactory()
+
+# these enable the use of this service with twistd
+application = service.Application("LEAP SMTP Relay")
+service = internet.TCPServer(port, factory)
+service.setServiceParent(application)
diff --git a/src/leap/email/smtp/tests/185CA770.key b/src/leap/email/smtp/tests/185CA770.key
new file mode 100644
index 00000000..587b4164
--- /dev/null
+++ b/src/leap/email/smtp/tests/185CA770.key
@@ -0,0 +1,79 @@
+-----BEGIN PGP PRIVATE KEY BLOCK-----
+Version: GnuPG v1.4.10 (GNU/Linux)
+
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diff --git a/src/leap/email/smtp/tests/185CA770.pub b/src/leap/email/smtp/tests/185CA770.pub
new file mode 100644
index 00000000..38af19f8
--- /dev/null
+++ b/src/leap/email/smtp/tests/185CA770.pub
@@ -0,0 +1,52 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: GnuPG v1.4.10 (GNU/Linux)
+
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+q3iu
+=RChS
+-----END PGP PUBLIC KEY BLOCK-----
diff --git a/src/leap/email/smtp/tests/__init__.py b/src/leap/email/smtp/tests/__init__.py
new file mode 100644
index 00000000..d00ebeb5
--- /dev/null
+++ b/src/leap/email/smtp/tests/__init__.py
@@ -0,0 +1,196 @@
+from leap.email.smtp.smtprelay import GPGWrapper
+import shutil
+from twisted.trial import unittest
+
+class OpenPGPTestCase(unittest.TestCase):
+
+    PREFIX     = "/var/tmp"
+    GNUPG_HOME = "%s/gnupg" % PREFIX
+    EMAIL      = 'leap@leap.se'
+
+    def setUp(self):
+        self._gpg = GPGWrapper(gpghome=self.GNUPG_HOME)
+        
+        self.assertEqual(self._gpg.import_keys(PUBLIC_KEY).summary(),
+                         '1 imported', "error importing public key")
+        self.assertEqual(self._gpg.import_keys(PRIVATE_KEY).summary(),
+                         # note that gnupg does not return a successful import
+                         # for private keys. Bug?
+                         '0 imported', "error importing private key")
+
+    def tearDown(self):
+        shutil.rmtree(self.GNUPG_HOME)
+
+    def test_openpgp_encrypt_decrypt(self):
+        text = "simple raw text"
+        encrypted = str(self._gpg.encrypt(text, KEY_FINGERPRINT,
+                                          # TODO: handle always trust issue
+                                          always_trust=True))
+        self.assertNotEqual(text, encrypted, "failed encrypting text")
+        decrypted = str(self._gpg.decrypt(encrypted))
+        self.assertEqual(text, decrypted, "failed decrypting text")
+        
+
+
+# Key material for testing
+KEY_FINGERPRINT = "E36E738D69173C13D709E44F2F455E2824D18DDF"
+PUBLIC_KEY = """
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: GnuPG v1.4.10 (GNU/Linux)
+
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+=MuOY
+-----END PGP PUBLIC KEY BLOCK-----
+"""
+PRIVATE_KEY = """
+-----BEGIN PGP PRIVATE KEY BLOCK-----
+Version: GnuPG v1.4.10 (GNU/Linux)
+
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+OXacTgmSYdTa9RM9fbfVpti01tJ84LV2SyL/VJq/enJF4XQPSynT/tFTn1PAor6o
+tEAAd8fjKdJ6LnD5wb92SPHfQfXqI84rFEO8rUNIE/1ErT6DYifDzVCbfD2KZdoF
+cOSp7TpD77sY1bs74ocBX5ejKtd+aH99D78bJSMM4pSDZsIEwnomkBHTziubPwJb
+OwnATy0LmSMAWOw5rKbsh5nfwCiUTM20xp0t5JeXd+wPVWbpWqI2EnkCEN+RJr9i
+7dp/ymDQ+Yt5wrsN3NwoyiexPOG91WQVCADdErHsnglVZZq9Z8Wx7KwecGCUurJ2
+H6lKudv5YOxPnAzqZS5HbpZd/nRTMZh2rdXCr5m2YOuewyYjvM757AkmUpM09zJX
+MQ1S67/UX2y8/74TcRF97Ncx9HeELs92innBRXoFitnNguvcO6Esx4BTe1OdU6qR
+ER3zAmVf22Le9ciXbu24DN4mleOH+OmBx7X2PqJSYW9GAMTsRB081R6EWKH7romQ
+waxFrZ4DJzZ9ltyosEJn5F32StyLrFxpcrdLUoEaclZCv2qka7sZvi0EvovDVEBU
+e10jOx9AOwf8Gj2ufhquQ6qgVYCzbP+YrodtkFrXRS3IsljIchj1M2ffB/0bfoUs
+rtER9pLvYzCjBPg8IfGLw0o754Qbhh/ReplCRTusP/fQMybvCvfxreS3oyEriu/G
+GufRomjewZ8EMHDIgUsLcYo2UHZsfF7tcazgxMGmMvazp4r8vpgrvW/8fIN/6Adu
+tF+WjWDTvJLFJCe6O+BFJOWrssNrrra1zGtLC1s8s+Wfpe+bGPL5zpHeebGTwH1U
+22eqgJArlEKxrfarz7W5+uHZJHSjF/K9ZvunLGD0n9GOPMpji3UO3zeM8IYoWn7E
+/EWK1XbjnssNemeeTZ+sDh+qrD7BOi+vCX1IyBxbfqnQfJZvmcPWpruy1UsO+aIC
+0GY8Jr3OL69dDQ21jueJAh8EGAEIAAkFAlC9+dkCGwwACgkQL0VeKCTRjd9HCw/+
+LQSVgLLF4ulYlPCjWIIuQwrPbJfWUVVr2dPUFVM85DCv8gBzk5c121snXh9Swovm
+laBbw6ate3BmbXLh64jVE9Za5sbTWi7PCcbO/bpRy4d6oLmitmNw6cq0vjTLxUYy
+bwuiJxWREkfxuU85EKdouN062YDevH+/YResmlJrcCE7LRlJFeRlKsrrwBU3BqYd
+GgFJjKjQC1peeQ9fj62Y7xfwE9+PXbkiWO5u/Bk8hb1VZH1SoIRU98NHVcp6BVvp
+VK0jLAXuSauSczULmpRjbyt1lhaAqivDTWEEZXiNNbRyp17c3nVdPWOcgBr42hdQ
+z25CgZgyLCsvu82wuXLKJblrIPJX3Yf+si6KqEWBsmwdOWybsjygaF5HvzgFqAAD
+U0goPWoQ71PorP2XOUNp5ZLkBQp5etvtkksjVNMIhnHn8PGMuoxO39EUGlWj2B5l
+Cu8tSosAzB1pS8NcLZzoNoI9dOHrmgJmP+GrOUkcf5GhNZbMoj4GNfGBRYX0SZlQ
+GuDrwNKYj73C4MWyNnnUFyq8nDHJ/G1NpaF2hiof9RBL4PUU/f92JkceXPBXA8gL
+Mz2ig1OButwPPLFGQhWqxXAGrsS3Ny+BhTJfnfIbbkaLLphBpDZm1D9XKbAUvdd1
+RZXoH+FTg9UAW87eqU610npOkT6cRaBxaMK/mDtGNdc=
+=JTFu
+-----END PGP PRIVATE KEY BLOCK-----
+"""
diff --git a/src/leap/email/smtp/tests/mail.txt b/src/leap/email/smtp/tests/mail.txt
new file mode 100644
index 00000000..95420470
--- /dev/null
+++ b/src/leap/email/smtp/tests/mail.txt
@@ -0,0 +1,10 @@
+HELO drebs@riseup.net
+MAIL FROM: drebs@riseup.net
+RCPT TO: drebs@riseup.net
+RCPT TO: drebs@leap.se
+DATA
+Subject: leap test
+
+Hello world!
+.
+QUIT
diff --git a/src/leap/email/smtp/tests/test_smtprelay.py b/src/leap/email/smtp/tests/test_smtprelay.py
new file mode 100644
index 00000000..dc0055c6
--- /dev/null
+++ b/src/leap/email/smtp/tests/test_smtprelay.py
@@ -0,0 +1,76 @@
+from datetime import datetime
+import re
+from leap.email.smtp.smtprelay import (
+    SMTPFactory,
+    #SMTPDelivery, # an object
+    EncryptedMessage,
+)
+from leap.email.smtp import tests
+from twisted.internet.error import ConnectionDone
+from twisted.test import proto_helpers
+from twisted.internet import defer
+from twisted.mail.smtp import User
+
+
+# some regexps
+IP_REGEX = "(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])";
+HOSTNAME_REGEX = "(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])";
+IP_OR_HOST_REGEX = '(' + IP_REGEX + '|' + HOSTNAME_REGEX + ')'
+
+class TestSmtpRelay(tests.OpenPGPTestCase):
+    
+
+    EMAIL_DATA = [ 'HELO relay.leap.se',
+                   'MAIL FROM: <user@leap.se>',
+                   'RCPT TO: <leap@leap.se>',
+                   'DATA',
+                   'From: User <user@leap.se>',
+                   'To: Leap <leap@leap.se>',
+                   'Date: ' + datetime.now().strftime('%c'),
+                   'Subject: test message',
+                   '',
+                   'This is a secret message.',
+                   'Yours,',
+                   'A.',
+                   '',
+                   '.',
+                   'QUIT' ]
+
+
+    def assertMatch(self, string, pattern, msg=None):
+        if not re.match(pattern, string):
+            msg = self._formatMessage(msg, '"%s" does not match pattern "%s".'
+            % (string, pattern))
+            raise self.failureException(msg)
+
+
+    def test_relay_accepts_valid_email(self):
+        """
+        Test if SMTP server responds correctly for valid interaction.
+        """
+        SMTP_ANSWERS = [ '220 ' + IP_OR_HOST_REGEX + ' NO UCE NO UBE NO RELAY PROBES',
+                         '250 ' + IP_OR_HOST_REGEX + ' Hello ' + IP_OR_HOST_REGEX + ', nice to meet you',
+                         '250 Sender address accepted',
+                         '250 Recipient address accepted',
+                         '354 Continue' ]
+        proto = SMTPFactory(self._gpg).buildProtocol(('127.0.0.1',0))
+        transport = proto_helpers.StringTransport()
+        proto.makeConnection(transport)
+        for i, line in enumerate(self.EMAIL_DATA):
+            proto.lineReceived(line + '\r\n')
+            self.assertMatch(transport.value(),
+                             '\r\n'.join(SMTP_ANSWERS[0:i+1]))
+        proto.setTimeout(None)
+
+
+    def test_message_encrypt(self):
+        proto = SMTPFactory(self._gpg).buildProtocol(('127.0.0.1',0))
+        user = User('leap@leap.se', 'relay.leap.se', proto, 'leap@leap.se')
+        m = EncryptedMessage(user, self._gpg)
+        for line in self.EMAIL_DATA[4:12]:
+            m.lineReceived(line)
+        m.parseMessage()
+        m.encrypt()
+        decrypted = str(self._gpg.decrypt(m.cyphertext))
+        self.assertEqual('\n'.join(self.EMAIL_DATA[9:12]), decrypted)
+
diff --git a/src/leap/soledad/backends/couch.py b/src/leap/soledad/backends/couch.py
index 8ba42d78..c8dadfa8 100644
--- a/src/leap/soledad/backends/couch.py
+++ b/src/leap/soledad/backends/couch.py
@@ -1,6 +1,8 @@
 import uuid
 from base64 import b64encode, b64decode
+from u1db import errors
 from u1db.sync import LocalSyncTarget
+from u1db.backends.inmemory import InMemoryIndex
 from couchdb.client import Server, Document as CouchDocument
 from couchdb.http import ResourceNotFound
 from leap.soledad.backends.objectstore import ObjectStore
@@ -36,7 +38,7 @@ class CouchDatabase(ObjectStore):
         super(CouchDatabase, self).__init__(replica_uid=replica_uid)
 
     #-------------------------------------------------------------------------
-    # implemented methods from Database
+    # methods from Database
     #-------------------------------------------------------------------------
 
     def _get_doc(self, doc_id, check_for_conflicts=False):
@@ -95,6 +97,23 @@ class CouchDatabase(ObjectStore):
     def get_sync_target(self):
         return CouchSyncTarget(self)
 
+    def create_index(self, index_name, *index_expressions):
+        if index_name in self._indexes:
+            if self._indexes[index_name]._definition == list(
+                    index_expressions):
+                return
+            raise errors.IndexNameTakenError
+        index = InMemoryIndex(index_name, list(index_expressions))
+        for doc_id in self._database:
+            if doc_id == self.U1DB_DATA_DOC_ID:
+                continue
+            doc = self._get_doc(doc_id)
+            if doc.content is not None:
+                index.add_json(doc_id, doc.get_json())
+        self._indexes[index_name] = index
+        # save data in object store
+        self._set_u1db_data()
+
     def close(self):
         # TODO: fix this method so the connection is properly closed and
         # test_close (+tearDown, which deletes the db) works without problems.
@@ -110,35 +129,47 @@ class CouchDatabase(ObjectStore):
         return Synchronizer(self, CouchSyncTarget(url, creds=creds)).sync(
             autocreate=autocreate)
 
-    def _initialize(self):
+    #-------------------------------------------------------------------------
+    # methods from ObjectStore
+    #-------------------------------------------------------------------------
+
+    def _init_u1db_data(self):
         if self._replica_uid is None:
             self._replica_uid = uuid.uuid4().hex
         doc = self._factory(doc_id=self.U1DB_DATA_DOC_ID)
-        doc.content = {'sync_log': [],
-                       'transaction_log': [],
-                       'conflict_log': b64encode(json.dumps([])),
+        doc.content = {'transaction_log': [],
+                       'conflicts': b64encode(json.dumps({})),
+                       'other_generations': {},
+                       'indexes': b64encode(json.dumps({})),
                        'replica_uid': self._replica_uid}
         self._put_doc(doc)
 
     def _get_u1db_data(self):
+        # retrieve u1db data from couch db
         cdoc = self._database.get(self.U1DB_DATA_DOC_ID)
         jsonstr = self._database.get_attachment(cdoc, 'u1db_json').getvalue()
         content = json.loads(jsonstr)
-        self._sync_log.log = content['sync_log']
-        self._transaction_log.log = content['transaction_log']
-        self._conflict_log.log = json.loads(b64decode(content['conflict_log']))
+        # set u1db database info
+        #self._sync_log = content['sync_log']
+        self._transaction_log = content['transaction_log']
+        self._conflicts = json.loads(b64decode(content['conflicts']))
+        self._other_generations = content['other_generations']
+        self._indexes = self._load_indexes_from_json(
+            b64decode(content['indexes']))
         self._replica_uid = content['replica_uid']
+        # save couch _rev
         self._couch_rev = cdoc['_rev']
 
     def _set_u1db_data(self):
         doc = self._factory(doc_id=self.U1DB_DATA_DOC_ID)
         doc.content = {
-            'sync_log': self._sync_log.log,
-            'transaction_log': self._transaction_log.log,
+            'transaction_log': self._transaction_log,
             # Here, the b64 encode ensures that document content
             # does not cause strange behaviour in couchdb because
             # of encoding.
-            'conflict_log': b64encode(json.dumps(self._conflict_log.log)),
+            'conflicts': b64encode(json.dumps(self._conflicts)),
+            'other_generations': self._other_generations,
+            'indexes': b64encode(self._dump_indexes_as_json()),
             'replica_uid': self._replica_uid,
             '_rev': self._couch_rev}
         self._put_doc(doc)
@@ -150,6 +181,22 @@ class CouchDatabase(ObjectStore):
     def delete_database(self):
         del(self._server[self._dbname])
 
+    def _dump_indexes_as_json(self):
+        indexes = {}
+        for name, idx in self._indexes.iteritems():
+            indexes[name] = {}
+            for attr in ['name', 'definition', 'values']:
+                indexes[name][attr] = getattr(idx, '_' + attr)
+        return json.dumps(indexes)
+
+    def _load_indexes_from_json(self, indexes):
+        dict = {}
+        for name, idx_dict in json.loads(indexes).iteritems():
+            idx = InMemoryIndex(name, idx_dict['definition'])
+            idx._values = idx_dict['values']
+            dict[name] = idx
+        return dict
+
 
 class CouchSyncTarget(LocalSyncTarget):
 
diff --git a/src/leap/soledad/backends/objectstore.py b/src/leap/soledad/backends/objectstore.py
index d72a2ecc..588fc7a1 100644
--- a/src/leap/soledad/backends/objectstore.py
+++ b/src/leap/soledad/backends/objectstore.py
@@ -1,77 +1,35 @@
-from u1db.backends import CommonBackend
-from u1db import errors, Document, vectorclock
+from u1db.backends.inmemory import InMemoryDatabase
+from u1db import errors
 
 
-class ObjectStore(CommonBackend):
+class ObjectStore(InMemoryDatabase):
     """
     A backend for storing u1db data in an object store.
     """
 
     def __init__(self, replica_uid=None):
-        # This initialization method should be called after the connection
-        # with the database is established in each implementation, so it can
-        # ensure that u1db data is configured and up-to-date.
-        self.set_document_factory(Document)
-        self._sync_log = SyncLog()
-        self._transaction_log = TransactionLog()
-        self._conflict_log = ConflictLog(self._factory)
-        self._replica_uid = replica_uid
-        self._ensure_u1db_data()
+        super(ObjectStore, self).__init__(replica_uid)
+        # sync data in memory with data in object store
+        if not self._get_doc(self.U1DB_DATA_DOC_ID):
+            self._init_u1db_data()
+        self._get_u1db_data()
 
     #-------------------------------------------------------------------------
-    # implemented methods from Database
+    # methods from Database
     #-------------------------------------------------------------------------
 
-    def set_document_factory(self, factory):
-        self._factory = factory
-
-    def set_document_size_limit(self, limit):
-        raise NotImplementedError(self.set_document_size_limit)
-
-    def whats_changed(self, old_generation=0):
-        self._get_u1db_data()
-        return self._transaction_log.whats_changed(old_generation)
-
-    def get_doc(self, doc_id, include_deleted=False):
-        doc = self._get_doc(doc_id, check_for_conflicts=True)
-        if doc is None:
-            return None
-        if doc.is_tombstone() and not include_deleted:
-            return None
-        return doc
+    def _set_replica_uid(self, replica_uid):
+        super(ObjectStore, self)._set_replica_uid(replica_uid)
+        self._set_u1db_data()
 
     def _put_doc(self, doc):
         raise NotImplementedError(self._put_doc)
 
-    def _update_gen_and_transaction_log(self, doc_id):
-        new_gen = self._get_generation() + 1
-        trans_id = self._allocate_transaction_id()
-        self._transaction_log.append((new_gen, doc_id, trans_id))
-        self._set_u1db_data()
+    def _get_doc(self, doc):
+        raise NotImplementedError(self._get_doc)
 
-    def put_doc(self, doc):
-        # consistency check
-        if doc.doc_id is None:
-            raise errors.InvalidDocId()
-        self._check_doc_id(doc.doc_id)
-        self._check_doc_size(doc)
-        # check if document exists
-        old_doc = self._get_doc(doc.doc_id, check_for_conflicts=True)
-        if old_doc and old_doc.has_conflicts:
-            raise errors.ConflictedDoc()
-        if old_doc and doc.rev is None and old_doc.is_tombstone():
-            new_rev = self._allocate_doc_rev(old_doc.rev)
-        else:
-            if old_doc is not None:
-                if old_doc.rev != doc.rev:
-                    raise errors.RevisionConflict()
-            else:
-                if doc.rev is not None:
-                    raise errors.RevisionConflict()
-            new_rev = self._allocate_doc_rev(doc.rev)
-        doc.rev = new_rev
-        self._put_and_update_indexes(old_doc, doc)
-        return doc.rev
+    def get_all_docs(self, include_deleted=False):
+        raise NotImplementedError(self.get_all_docs)
 
     def delete_doc(self, doc):
         old_doc = self._get_doc(doc.doc_id, check_for_conflicts=True)
@@ -89,130 +47,49 @@ class ObjectStore(CommonBackend):
         self._put_and_update_indexes(old_doc, doc)
         return new_rev
 
-    # start of index-related methods: these are not supported by this backend.
+    # index-related methods
 
     def create_index(self, index_name, *index_expressions):
-        return False
+        raise NotImplementedError(self.create_index)
 
     def delete_index(self, index_name):
-        return False
-
-    def list_indexes(self):
-        return []
-
-    def get_from_index(self, index_name, *key_values):
-        return []
-
-    def get_range_from_index(self, index_name, start_value=None,
-                             end_value=None):
-        return []
-
-    def get_index_keys(self, index_name):
-        return []
-
-    # end of index-related methods: these are not supported by this backend.
-
-    def get_doc_conflicts(self, doc_id):
-        self._get_u1db_data()
-        conflict_docs = self._conflict_log.get_conflicts(doc_id)
-        if not conflict_docs:
-            return []
-        this_doc = self._get_doc(doc_id)
-        this_doc.has_conflicts = True
-        return [this_doc] + list(conflict_docs)
-
-    def resolve_doc(self, doc, conflicted_doc_revs):
-        cur_doc = self._get_doc(doc.doc_id)
-        new_rev = self._ensure_maximal_rev(cur_doc.rev,
-                                           conflicted_doc_revs)
-        superseded_revs = set(conflicted_doc_revs)
-        doc.rev = new_rev
-        if cur_doc.rev in superseded_revs:
-            self._put_and_update_indexes(cur_doc, doc)
-        else:
-            self._add_conflict(doc.doc_id, new_rev, doc.get_json())
-        self._delete_conflicts(doc, superseded_revs)
-
-    def _get_replica_gen_and_trans_id(self, other_replica_uid):
-        self._get_u1db_data()
-        return self._sync_log.get_replica_gen_and_trans_id(other_replica_uid)
+        super(ObjectStore, self).delete_index(index_name)
+        self._set_u1db_data()
 
-    def _set_replica_gen_and_trans_id(self, other_replica_uid,
-                                      other_generation, other_transaction_id):
-        return self._do_set_replica_gen_and_trans_id(
-            other_replica_uid,
-            other_generation,
-            other_transaction_id)
+    def _replace_conflicts(self, doc, conflicts):
+        super(ObjectStore, self)._replace_conflicts(doc, conflicts)
+        self._set_u1db_data()
 
     def _do_set_replica_gen_and_trans_id(self, other_replica_uid,
                                          other_generation,
                                          other_transaction_id):
-        self._sync_log.set_replica_gen_and_trans_id(other_replica_uid,
-                                                    other_generation,
-                                                    other_transaction_id)
+        super(ObjectStore, self)._do_set_replica_gen_and_trans_id(
+            other_replica_uid,
+            other_generation,
+            other_transaction_id)
         self._set_u1db_data()
 
-    def _get_transaction_log(self):
-        self._get_u1db_data()
-        return self._transaction_log.get_transaction_log()
-
     #-------------------------------------------------------------------------
     # implemented methods from CommonBackend
     #-------------------------------------------------------------------------
 
-    def _get_generation(self):
-        self._get_u1db_data()
-        return self._transaction_log.get_generation()
-
-    def _get_generation_info(self):
-        self._get_u1db_data()
-        return self._transaction_log.get_generation_info()
-
-    def _has_conflicts(self, doc_id):
-        self._get_u1db_data()
-        return self._conflict_log.has_conflicts(doc_id)
-
     def _put_and_update_indexes(self, old_doc, doc):
-        # for now we ignore indexes as this backend is used to store encrypted
-        # blobs of data in the server.
+        for index in self._indexes.itervalues():
+            if old_doc is not None and not old_doc.is_tombstone():
+                index.remove_json(old_doc.doc_id, old_doc.get_json())
+            if not doc.is_tombstone():
+                index.add_json(doc.doc_id, doc.get_json())
+        trans_id = self._allocate_transaction_id()
         self._put_doc(doc)
-        self._update_gen_and_transaction_log(doc.doc_id)
-
-    def _get_trans_id_for_gen(self, generation):
-        self._get_u1db_data()
-        trans_id = self._transaction_log.get_trans_id_for_gen(generation)
-        if trans_id is None:
-            raise errors.InvalidGeneration
-        return trans_id
+        self._transaction_log.append((doc.doc_id, trans_id))
+        self._set_u1db_data()
 
     #-------------------------------------------------------------------------
     # methods specific for object stores
     #-------------------------------------------------------------------------
 
-    def _ensure_u1db_data(self):
-        """
-        Guarantee that u1db data (logs and replica info) exists in store.
-        """
-        if not self._is_initialized():
-            self._initialize()
-        self._get_u1db_data()
-
     U1DB_DATA_DOC_ID = 'u1db_data'
 
-    def _is_initialized(self):
-        """
-        Verify if u1db data exists in store.
-        """
-        if not self._get_doc(self.U1DB_DATA_DOC_ID):
-            return False
-        return True
-
-    def _initialize(self):
-        """
-        Create u1db data object in store.
-        """
-        NotImplementedError(self._initialize)
-
     def _get_u1db_data(self):
         """
         Fetch u1db configuration data from backend storage.
@@ -225,227 +102,8 @@ class ObjectStore(CommonBackend):
         """
         NotImplementedError(self._set_u1db_data)
 
-    def _set_replica_uid(self, replica_uid):
-        self._replica_uid = replica_uid
-        self._set_u1db_data()
-
-    def _get_replica_uid(self):
-        return self._replica_uid
-
-    replica_uid = property(
-        _get_replica_uid, _set_replica_uid, doc="Replica UID of the database")
-
-    #-------------------------------------------------------------------------
-    # The methods below were cloned from u1db sqlite backend. They should at
-    # least exist and raise a NotImplementedError exception in CommonBackend
-    # (should we maybe fill a bug in u1db bts?).
-    #-------------------------------------------------------------------------
-
-    def _add_conflict(self, doc_id, my_doc_rev, my_content):
-        self._conflict_log.append((doc_id, my_doc_rev, my_content))
-        self._set_u1db_data()
-
-    def _delete_conflicts(self, doc, conflict_revs):
-        deleting = [(doc.doc_id, c_rev) for c_rev in conflict_revs]
-        self._conflict_log.delete_conflicts(deleting)
-        self._set_u1db_data()
-        doc.has_conflicts = self._has_conflicts(doc.doc_id)
-
-    def _prune_conflicts(self, doc, doc_vcr):
-        if self._has_conflicts(doc.doc_id):
-            autoresolved = False
-            c_revs_to_prune = []
-            for c_doc in self._conflict_log.get_conflicts(doc.doc_id):
-                c_vcr = vectorclock.VectorClockRev(c_doc.rev)
-                if doc_vcr.is_newer(c_vcr):
-                    c_revs_to_prune.append(c_doc.rev)
-                elif doc.same_content_as(c_doc):
-                    c_revs_to_prune.append(c_doc.rev)
-                    doc_vcr.maximize(c_vcr)
-                    autoresolved = True
-            if autoresolved:
-                doc_vcr.increment(self._replica_uid)
-                doc.rev = doc_vcr.as_str()
-            self._delete_conflicts(doc, c_revs_to_prune)
-
-    def _force_doc_sync_conflict(self, doc):
-        my_doc = self._get_doc(doc.doc_id)
-        self._prune_conflicts(doc, vectorclock.VectorClockRev(doc.rev))
-        self._add_conflict(doc.doc_id, my_doc.rev, my_doc.get_json())
-        doc.has_conflicts = True
-        self._put_and_update_indexes(my_doc, doc)
-
-
-#----------------------------------------------------------------------------
-# U1DB's TransactionLog, SyncLog, ConflictLog, and Index
-#----------------------------------------------------------------------------
-
-class SimpleList(object):
-    def __init__(self):
-        self._data = []
-
-    def _set_data(self, data):
-        self._data = data
-
-    def _get_data(self):
-        return self._data
-
-    data = property(
-        _get_data, _set_data, doc="List contents.")
-
-    def append(self, msg):
-        self._data.append(msg)
-
-    def reduce(self, func, initializer=None):
-        return reduce(func, self._data, initializer)
-
-    def map(self, func):
-        return map(func, self._get_data())
-
-    def filter(self, func):
-        return filter(func, self._get_data())
-
-
-class SimpleLog(SimpleList):
-
-    def _set_log(self, log):
-        self._data = log
-
-    def _get_log(self):
-        return self._data
-
-    log = property(
-        _get_log, _set_log, doc="Log contents.")
-
-
-class TransactionLog(SimpleLog):
-    """
-    An ordered list of (generation, doc_id, transaction_id) tuples.
-    """
-
-    def _set_log(self, log):
-        self._data = log
-
-    def _get_data(self, reverse=True):
-        return sorted(self._data, reverse=reverse)
-
-    _get_log = _get_data
-
-    log = property(
-        _get_log, _set_log, doc="Log contents.")
-
-    def get_generation(self):
-        """
-        Return the current generation.
+    def _init_u1db_data(self):
         """
-        gens = self.map(lambda x: x[0])
-        if not gens:
-            return 0
-        return max(gens)
-
-    def get_generation_info(self):
-        """
-        Return the current generation and transaction id.
-        """
-        if not self._get_log():
-            return(0, '')
-        info = self.map(lambda x: (x[0], x[2]))
-        return reduce(lambda x, y: x if (x[0] > y[0]) else y, info)
-
-    def get_trans_id_for_gen(self, gen):
-        """
-        Get the transaction id corresponding to a particular generation.
-        """
-        log = self.reduce(lambda x, y: y if y[0] == gen else x)
-        if log is None:
-            return None
-        return log[2]
-
-    def whats_changed(self, old_generation):
-        """
-        Return a list of documents that have changed since old_generation.
+        Initialize u1db configuration data on backend storage.
         """
-        results = self.filter(lambda x: x[0] > old_generation)
-        seen = set()
-        changes = []
-        newest_trans_id = ''
-        for generation, doc_id, trans_id in results:
-            if doc_id not in seen:
-                changes.append((doc_id, generation, trans_id))
-                seen.add(doc_id)
-        if changes:
-            cur_gen = changes[0][1]  # max generation
-            newest_trans_id = changes[0][2]
-            changes.reverse()
-        else:
-            results = self._get_log()
-            if not results:
-                cur_gen = 0
-                newest_trans_id = ''
-            else:
-                cur_gen, _, newest_trans_id = results[0]
-
-        return cur_gen, newest_trans_id, changes
-
-    def get_transaction_log(self):
-        """
-        Return only a list of (doc_id, transaction_id)
-        """
-        return map(lambda x: (x[1], x[2]),
-                   sorted(self._get_log(reverse=False)))
-
-
-class SyncLog(SimpleLog):
-    """
-    A list of (replica_id, generation, transaction_id) tuples.
-    """
-
-    def find_by_replica_uid(self, replica_uid):
-        if not self._get_log():
-            return ()
-        return self.reduce(lambda x, y: y if y[0] == replica_uid else x)
-
-    def get_replica_gen_and_trans_id(self, other_replica_uid):
-        """
-        Return the last known generation and transaction id for the other db
-        replica.
-        """
-        info = self.find_by_replica_uid(other_replica_uid)
-        if not info:
-            return (0, '')
-        return (info[1], info[2])
-
-    def set_replica_gen_and_trans_id(self, other_replica_uid,
-                                     other_generation, other_transaction_id):
-        """
-        Set the last-known generation and transaction id for the other
-        database replica.
-        """
-        self._set_log(self.filter(lambda x: x[0] != other_replica_uid))
-        self.append((other_replica_uid, other_generation,
-                     other_transaction_id))
-
-
-class ConflictLog(SimpleLog):
-    """
-    A list of (doc_id, my_doc_rev, my_content) tuples.
-    """
-
-    def __init__(self, factory):
-        super(ConflictLog, self).__init__()
-        self._factory = factory
-
-    def delete_conflicts(self, conflicts):
-        for conflict in conflicts:
-            self._set_log(self.filter(lambda x:
-                          x[0] != conflict[0] or x[1] != conflict[1]))
-
-    def get_conflicts(self, doc_id):
-        conflicts = self.filter(lambda x: x[0] == doc_id)
-        if not conflicts:
-            return []
-        return reversed(map(lambda x: self._factory(doc_id, x[1], x[2]),
-                            conflicts))
-
-    def has_conflicts(self, doc_id):
-        return bool(self.filter(lambda x: x[0] == doc_id))
+        NotImplementedError(self._init_u1db_data)
diff --git a/src/leap/soledad/tests/test_couch.py b/src/leap/soledad/tests/test_couch.py
index 5e8d6126..6c3d7daf 100644
--- a/src/leap/soledad/tests/test_couch.py
+++ b/src/leap/soledad/tests/test_couch.py
@@ -46,9 +46,10 @@ def copy_couch_database_for_test(test, db):
     gen, docs = db.get_all_docs(include_deleted=True)
     for doc in docs:
         new_db._put_doc(doc)
-    new_db._transaction_log._data = copy.deepcopy(db._transaction_log._data)
-    new_db._sync_log._data = copy.deepcopy(db._sync_log._data)
-    new_db._conflict_log._data = copy.deepcopy(db._conflict_log._data)
+    new_db._transaction_log = copy.deepcopy(db._transaction_log)
+    new_db._conflicts = copy.deepcopy(db._conflicts)
+    new_db._other_generations = copy.deepcopy(db._other_generations)
+    new_db._indexes = copy.deepcopy(db._indexes)
     new_db._set_u1db_data()
     return new_db
 
@@ -112,13 +113,13 @@ class CouchWithConflictsTests(
 # the server, so indexing makes no sense. Thus, we ignore index testing for
 # now.
 
-# class CouchIndexTests(DatabaseIndexTests):
-#
-#    scenarios = COUCH_SCENARIOS
-#
-#    def tearDown(self):
-#        self.db.delete_database()
-#        super(CouchIndexTests, self).tearDown()
+class CouchIndexTests(test_backends.DatabaseIndexTests):
+
+    scenarios = COUCH_SCENARIOS
+
+    def tearDown(self):
+        self.db.delete_database()
+        super(CouchIndexTests, self).tearDown()
 
 
 #-----------------------------------------------------------------------------
@@ -196,23 +197,5 @@ class CouchDatabaseSyncTests(test_sync.DatabaseSyncTests):
         db.delete_database()
         super(CouchDatabaseSyncTests, self).tearDown()
 
-    # The following tests use indexing, so we eliminate them for now because
-    # indexing is still not implemented in couch backend.
-
-    def test_sync_pulls_changes(self):
-        pass
-
-    def test_sync_sees_remote_conflicted(self):
-        pass
-
-    def test_sync_sees_remote_delete_conflicted(self):
-        pass
-
-    def test_sync_local_race_conflicted(self):
-        pass
-
-    def test_sync_propagates_deletes(self):
-        pass
-
 
 load_tests = tests.load_with_scenarios