Merge remote-tracking branch 'refs/remotes/ivan/feature/new-frontend-backend' into develop

10 files changed, 1320 insertions, 600 deletions

diff --git a/src/leap/bitmask/backend/api.py b/src/leap/bitmask/backend/api.py
new file mode 100644
index 00000000..b8533f36
--- /dev/null
+++ b/src/leap/bitmask/backend/api.py
@@ -0,0 +1,148 @@
+# -*- coding: utf-8 -*-
+# api.py
+# Copyright (C) 2013, 2014 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+Backend available API and SIGNALS definition.
+"""
+STOP_REQUEST = "stop"
+
+API = (
+    STOP_REQUEST,  # this method needs to be defined in order to support the
+                   # backend stop action
+
+    "eip_can_start",
+    "eip_cancel_setup",
+    "eip_check_dns",
+    "eip_get_gateway_country_code",
+    "eip_get_gateways_list",
+    "eip_get_initialized_providers",
+    "eip_setup",
+    "eip_start",
+    "eip_stop",
+    "eip_terminate",
+    "imap_start_service",
+    "imap_stop_service",
+    "keymanager_export_keys",
+    "keymanager_get_key_details",
+    "keymanager_list_keys",
+    "provider_bootstrap",
+    "provider_cancel_setup",
+    "provider_get_all_services",
+    "provider_get_details",
+    "provider_get_pinned_providers",
+    "provider_get_supported_services",
+    "provider_setup",
+    "settings_set_selected_gateway",
+    "smtp_start_service",
+    "smtp_stop_service",
+    "soledad_bootstrap",
+    "soledad_cancel_bootstrap",
+    "soledad_change_password",
+    "soledad_close",
+    "soledad_load_offline",
+    "tear_fw_down",
+    "user_cancel_login",
+    "user_change_password",
+    "user_get_logged_in_status",
+    "user_login",
+    "user_logout",
+    "user_register",
+)
+
+
+SIGNALS = (
+    "backend_bad_call",
+    "eip_alien_openvpn_already_running",
+    "eip_can_start",
+    "eip_cancelled_setup",
+    "eip_cannot_start",
+    "eip_client_certificate_ready",
+    "eip_config_ready",
+    "eip_connected",
+    "eip_connection_aborted",
+    "eip_connection_died",
+    "eip_disconnected",
+    "eip_dns_error",
+    "eip_dns_ok",
+    "eip_get_gateway_country_code",
+    "eip_get_gateways_list",
+    "eip_get_gateways_list_error",
+    "eip_get_initialized_providers",
+    "eip_network_unreachable",
+    "eip_no_gateway",
+    "eip_no_pkexec_error",
+    "eip_no_polkit_agent_error",
+    "eip_no_tun_kext_error",
+    "eip_openvpn_already_running",
+    "eip_openvpn_not_found_error",
+    "eip_process_finished",
+    "eip_process_restart_ping",
+    "eip_process_restart_tls",
+    "eip_state_changed",
+    "eip_status_changed",
+    "eip_stopped",
+    "eip_tear_fw_down",
+    "eip_uninitialized_provider",
+    "eip_vpn_launcher_exception",
+    "imap_stopped",
+    "keymanager_export_error",
+    "keymanager_export_ok",
+    "keymanager_import_addressmismatch",
+    "keymanager_import_datamismatch",
+    "keymanager_import_ioerror",
+    "keymanager_import_missingkey",
+    "keymanager_import_ok",
+    "keymanager_key_details",
+    "keymanager_keys_list",
+    "prov_cancelled_setup",
+    "prov_check_api_certificate",
+    "prov_check_ca_fingerprint",
+    "prov_download_ca_cert",
+    "prov_download_provider_info",
+    "prov_get_all_services",
+    "prov_get_details",
+    "prov_get_pinned_providers",
+    "prov_get_supported_services",
+    "prov_https_connection",
+    "prov_name_resolution",
+    "prov_problem_with_provider",
+    "prov_unsupported_api",
+    "prov_unsupported_client",
+    "soledad_bootstrap_failed",
+    "soledad_bootstrap_finished",
+    "soledad_cancelled_bootstrap",
+    "soledad_invalid_auth_token",
+    "soledad_offline_failed",
+    "soledad_offline_finished",
+    "soledad_password_change_error",
+    "soledad_password_change_ok",
+    "srp_auth_bad_user_or_password",
+    "srp_auth_connection_error",
+    "srp_auth_error",
+    "srp_auth_ok",
+    "srp_auth_server_error",
+    "srp_logout_error",
+    "srp_logout_ok",
+    "srp_not_logged_in_error",
+    "srp_password_change_badpw",
+    "srp_password_change_error",
+    "srp_password_change_ok",
+    "srp_registration_failed",
+    "srp_registration_finished",
+    "srp_registration_taken",
+    "srp_status_logged_in",
+    "srp_status_not_logged_in",
+)
diff --git a/src/leap/bitmask/backend/backend.py b/src/leap/bitmask/backend/backend.py
new file mode 100644
index 00000000..833f4368
--- /dev/null
+++ b/src/leap/bitmask/backend/backend.py
@@ -0,0 +1,210 @@
+# -*- coding: utf-8 -*-
+# backend.py
+# Copyright (C) 2013, 2014 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+import json
+import threading
+import time
+
+from twisted.internet import defer, reactor, threads
+
+import zmq
+from zmq.auth.thread import ThreadAuthenticator
+
+from leap.bitmask.backend.api import API
+from leap.bitmask.backend.utils import get_backend_certificates
+from leap.bitmask.backend.signaler import Signaler
+
+import logging
+logger = logging.getLogger(__name__)
+
+
+class Backend(object):
+    """
+    Backend server.
+    Receives signals from backend_proxy and emit signals if needed.
+    """
+    PORT = '5556'
+    BIND_ADDR = "tcp://127.0.0.1:%s" % PORT
+
+    def __init__(self):
+        """
+        Backend constructor, create needed instances.
+        """
+        self._signaler = Signaler()
+
+        self._do_work = threading.Event()  # used to stop the worker thread.
+        self._zmq_socket = None
+
+        self._ongoing_defers = []
+        self._init_zmq()
+
+    def _init_zmq(self):
+        """
+        Configure the zmq components and connection.
+        """
+        context = zmq.Context()
+        socket = context.socket(zmq.REP)
+
+        # Start an authenticator for this context.
+        auth = ThreadAuthenticator(context)
+        auth.start()
+        auth.allow('127.0.0.1')
+
+        # Tell authenticator to use the certificate in a directory
+        auth.configure_curve(domain='*', location=zmq.auth.CURVE_ALLOW_ANY)
+        public, secret = get_backend_certificates()
+        socket.curve_publickey = public
+        socket.curve_secretkey = secret
+        socket.curve_server = True  # must come before bind
+
+        socket.bind(self.BIND_ADDR)
+
+        self._zmq_socket = socket
+
+    def _worker(self):
+        """
+        Receive requests and send it to process.
+
+        Note: we use a simple while since is less resource consuming than a
+        Twisted's LoopingCall.
+        """
+        while self._do_work.is_set():
+            # Wait for next request from client
+            try:
+                request = self._zmq_socket.recv(zmq.NOBLOCK)
+                self._zmq_socket.send("OK")
+                # logger.debug("Received request: '{0}'".format(request))
+                self._process_request(request)
+            except zmq.ZMQError as e:
+                if e.errno != zmq.EAGAIN:
+                    raise
+            time.sleep(0.01)
+
+    def _stop_reactor(self):
+        """
+        Stop the Twisted reactor, but first wait a little for some threads to
+        complete their work.
+
+        Note: this method needs to be run in a different thread so the
+        time.sleep() does not block and other threads can finish.
+        i.e.:
+            use threads.deferToThread(this_method) instead of this_method()
+        """
+        wait_max = 5  # seconds
+        wait_step = 0.5
+        wait = 0
+        while self._ongoing_defers and wait < wait_max:
+            time.sleep(wait_step)
+            wait += wait_step
+            msg = "Waiting for running threads to finish... {0}/{1}"
+            msg = msg.format(wait, wait_max)
+            logger.debug(msg)
+
+        # after a timeout we shut down the existing threads.
+        for d in self._ongoing_defers:
+            d.cancel()
+
+        reactor.stop()
+        logger.debug("Twisted reactor stopped.")
+
+    def run(self):
+        """
+        Start the ZMQ server and run the loop to handle requests.
+        """
+        self._signaler.start()
+        self._do_work.set()
+        threads.deferToThread(self._worker)
+        reactor.run()
+
+    def stop(self):
+        """
+        Stop the server and the zmq request parse loop.
+        """
+        logger.debug("STOP received.")
+        self._signaler.stop()
+        self._do_work.clear()
+        threads.deferToThread(self._stop_reactor)
+
+    def _process_request(self, request_json):
+        """
+        Process a request and call the according method with the given
+        parameters.
+
+        :param request_json: a json specification of a request.
+        :type request_json: str
+        """
+        try:
+            # request = zmq.utils.jsonapi.loads(request_json)
+            # We use stdlib's json to ensure that we get unicode strings
+            request = json.loads(request_json)
+            api_method = request['api_method']
+            kwargs = request['arguments'] or None
+        except Exception as e:
+            msg = "Malformed JSON data in Backend request '{0}'. Exc: {1!r}"
+            msg = msg.format(request_json, e)
+            msg = msg.format(request_json)
+            logger.critical(msg)
+            raise
+
+        if api_method not in API:
+            logger.error("Invalid API call '{0}'".format(api_method))
+            return
+
+        self._run_in_thread(api_method, kwargs)
+
+    def _run_in_thread(self, api_method, kwargs):
+        """
+        Run the method name in a thread with the given arguments.
+
+        :param api_method: the callable name to run in a thread.
+        :type api_method: str
+        :param kwargs: the arguments dict that will be sent to the callable.
+        :type kwargs: tuple
+        """
+        func = getattr(self, api_method)
+
+        method = func
+        if kwargs is not None:
+            method = lambda: func(**kwargs)
+
+        # logger.debug("Running method: '{0}' "
+        #            "with args: '{1}' in a thread".format(api_method, kwargs))
+
+        # run the action in a thread and keep track of it
+        d = threads.deferToThread(method)
+        d.addCallback(self._done_action, d)
+        d.addErrback(self._done_action, d)
+        self._ongoing_defers.append(d)
+
+    def _done_action(self, failure, d):
+        """
+        Remove the defer from the ongoing list.
+
+        :param failure: the failure that triggered the errback.
+                        None if no error.
+        :type failure: twisted.python.failure.Failure
+        :param d: defer to remove
+        :type d: twisted.internet.defer.Deferred
+        """
+        if failure is not None:
+            if failure.check(defer.CancelledError):
+                logger.debug("A defer was cancelled.")
+            else:
+                logger.error("There was a failure - {0!r}".format(failure))
+                logger.error(failure.getTraceback())
+
+        if d in self._ongoing_defers:
+            self._ongoing_defers.remove(d)
diff --git a/src/leap/bitmask/backend/backend_proxy.py b/src/leap/bitmask/backend/backend_proxy.py
new file mode 100644
index 00000000..f683e465
--- /dev/null
+++ b/src/leap/bitmask/backend/backend_proxy.py
@@ -0,0 +1,162 @@
+# -*- coding: utf-8 -*-
+# backend_proxy.py
+# Copyright (C) 2013, 2014 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+The BackendProxy handles calls from the GUI and forwards (through ZMQ)
+to the backend.
+"""
+import functools
+import Queue
+import threading
+import time
+
+import zmq
+
+from leap.bitmask.backend.api import API, STOP_REQUEST
+from leap.bitmask.backend.utils import get_backend_certificates
+
+import logging
+logger = logging.getLogger(__name__)
+
+
+class BackendProxy(object):
+    """
+    The BackendProxy handles calls from the GUI and forwards (through ZMQ)
+    to the backend.
+    """
+    PORT = '5556'
+    SERVER = "tcp://localhost:%s" % PORT
+
+    def __init__(self):
+        self._socket = None
+
+        # initialize ZMQ stuff:
+        context = zmq.Context()
+        logger.debug("Connecting to server...")
+        socket = context.socket(zmq.REQ)
+
+        # public, secret = zmq.curve_keypair()
+        client_keys = zmq.curve_keypair()
+        socket.curve_publickey = client_keys[0]
+        socket.curve_secretkey = client_keys[1]
+
+        # The client must know the server's public key to make a CURVE
+        # connection.
+        public, _ = get_backend_certificates()
+        socket.curve_serverkey = public
+
+        socket.setsockopt(zmq.RCVTIMEO, 1000)
+        socket.connect(self.SERVER)
+        self._socket = socket
+
+        self._call_queue = Queue.Queue()
+        self._worker_caller = threading.Thread(target=self._worker)
+        self._worker_caller.start()
+
+    def _worker(self):
+        """
+        Worker loop that processes the Queue of pending requests to do.
+        """
+        while True:
+            try:
+                request = self._call_queue.get(block=False)
+                # break the loop after sending the 'stop' action to the
+                # backend.
+                if request == STOP_REQUEST:
+                    break
+
+                self._send_request(request)
+            except Queue.Empty:
+                pass
+            time.sleep(0.01)
+
+        logger.debug("BackendProxy worker stopped.")
+
+    def _api_call(self, *args, **kwargs):
+        """
+        Call the `api_method` method in backend (through zmq).
+
+        :param kwargs: named arguments to forward to the backend api method.
+        :type kwargs: dict
+
+        Note: is mandatory to have the kwarg 'api_method' defined.
+        """
+        if args:
+            # Use a custom message to be more clear about using kwargs *only*
+            raise Exception("All arguments need to be kwargs!")
+
+        api_method = kwargs.pop('api_method', None)
+        if api_method is None:
+            raise Exception("Missing argument, no method name specified.")
+
+        request = {
+            'api_method': api_method,
+            'arguments': kwargs,
+        }
+
+        try:
+            request_json = zmq.utils.jsonapi.dumps(request)
+        except Exception as e:
+            msg = ("Error serializing request into JSON.\n"
+                   "Exception: {0} Data: {1}")
+            msg = msg.format(e, request)
+            logger.critical(msg)
+            raise
+
+        # queue the call in order to handle the request in a thread safe way.
+        self._call_queue.put(request_json)
+
+        if api_method == STOP_REQUEST:
+            self._call_queue.put(STOP_REQUEST)
+
+    def _send_request(self, request):
+        """
+        Send the given request to the server.
+        This is used from a thread safe loop in order to avoid sending a
+        request without receiving a response from a previous one.
+
+        :param request: the request to send.
+        :type request: str
+        """
+        # logger.debug("Sending request to backend: {0}".format(request))
+        self._socket.send(request)
+
+        try:
+            # Get the reply.
+            self._socket.recv()
+            # response = self._socket.recv()
+            # msg = "Received reply for '{0}' -> '{1}'"
+            # msg = msg.format(request, response)
+            # logger.debug(msg)
+        except zmq.error.Again as e:
+            msg = "Timeout error contacting backend. {0!r}".format(e)
+            logger.critical(msg)
+
+    def __getattribute__(self, name):
+        """
+        This allows the user to do:
+            bp = BackendProxy()
+            bp.some_method()
+
+        Just by having defined 'some_method' in the API
+
+        :param name: the attribute name that is requested.
+        :type name: str
+        """
+        if name in API:
+            return functools.partial(self._api_call, api_method=name)
+        else:
+            return object.__getattribute__(self, name)
diff --git a/src/leap/bitmask/backend/components.py b/src/leap/bitmask/backend/components.py
index 19fcf283..b372db89 100644
--- a/src/leap/bitmask/backend/components.py
+++ b/src/leap/bitmask/backend/components.py
@@ -31,6 +31,7 @@ from twisted.python import log
 import zope.interface
 import zope.proxy
 
+from leap.bitmask.backend.settings import Settings, GATEWAY_AUTOMATIC
 from leap.bitmask.config.providerconfig import ProviderConfig
 from leap.bitmask.crypto.srpauth import SRPAuth
 from leap.bitmask.crypto.srpregister import SRPRegister
@@ -197,7 +198,7 @@ class Provider(object):
         else:
             if self._signaler is not None:
                 self._signaler.signal(
-                    self._signaler.PROV_PROBLEM_WITH_PROVIDER_KEY)
+                    self._signaler.prov_problem_with_provider)
             logger.error("Could not load provider configuration.")
             self._login_widget.set_enabled(True)
 
@@ -234,7 +235,7 @@ class Provider(object):
         services = get_supported(self._get_services(domain))
 
         self._signaler.signal(
-            self._signaler.PROV_GET_SUPPORTED_SERVICES, services)
+            self._signaler.prov_get_supported_services, services)
 
     def get_all_services(self, providers):
         """
@@ -253,7 +254,7 @@ class Provider(object):
             services_all = services_all.union(set(services))
 
         self._signaler.signal(
-            self._signaler.PROV_GET_ALL_SERVICES, services_all)
+            self._signaler.prov_get_all_services, list(services_all))
 
     def get_details(self, domain, lang=None):
         """
@@ -268,7 +269,7 @@ class Provider(object):
             prov_get_details -> dict
         """
         self._signaler.signal(
-            self._signaler.PROV_GET_DETAILS,
+            self._signaler.prov_get_details,
             self._provider_config.get_light_config(domain, lang))
 
     def get_pinned_providers(self):
@@ -279,7 +280,7 @@ class Provider(object):
             prov_get_pinned_providers -> list of provider domains
         """
         self._signaler.signal(
-            self._signaler.PROV_GET_PINNED_PROVIDERS,
+            self._signaler.prov_get_pinned_providers,
             PinnedProviders.domains())
 
 
@@ -324,7 +325,7 @@ class Register(object):
                 partial(srpregister.register_user, username, password))
         else:
             if self._signaler is not None:
-                self._signaler.signal(self._signaler.SRP_REGISTRATION_FAILED)
+                self._signaler.signal(self._signaler.srp_registration_failed)
             logger.error("Could not load provider configuration.")
 
 
@@ -401,12 +402,12 @@ class EIP(object):
 
         if not self._can_start(domain):
             if self._signaler is not None:
-                self._signaler.signal(self._signaler.EIP_CONNECTION_ABORTED)
+                self._signaler.signal(self._signaler.eip_connection_aborted)
             return
 
         if not loaded:
             if self._signaler is not None:
-                self._signaler.signal(self._signaler.EIP_CONNECTION_ABORTED)
+                self._signaler.signal(self._signaler.eip_connection_aborted)
             logger.error("Tried to start EIP but cannot find any "
                          "available provider!")
             return
@@ -425,28 +426,28 @@ class EIP(object):
 
         if not self._provider_config.loaded():
             # This means that the user didn't call setup_eip first.
-            self._signaler.signal(signaler.BACKEND_BAD_CALL, "EIP.start(), "
+            self._signaler.signal(signaler.backend_bad_call, "EIP.start(), "
                                   "no provider loaded")
             return
 
         try:
             self._start_eip(*args, **kwargs)
         except vpnprocess.OpenVPNAlreadyRunning:
-            signaler.signal(signaler.EIP_OPENVPN_ALREADY_RUNNING)
+            signaler.signal(signaler.eip_openvpn_already_running)
         except vpnprocess.AlienOpenVPNAlreadyRunning:
-            signaler.signal(signaler.EIP_ALIEN_OPENVPN_ALREADY_RUNNING)
+            signaler.signal(signaler.eip_alien_openvpn_already_running)
         except vpnlauncher.OpenVPNNotFoundException:
-            signaler.signal(signaler.EIP_OPENVPN_NOT_FOUND_ERROR)
+            signaler.signal(signaler.eip_openvpn_not_found_error)
         except vpnlauncher.VPNLauncherException:
             # TODO: this seems to be used for 'gateway not found' only.
             #       see vpnlauncher.py
-            signaler.signal(signaler.EIP_VPN_LAUNCHER_EXCEPTION)
+            signaler.signal(signaler.eip_vpn_launcher_exception)
         except linuxvpnlauncher.EIPNoPolkitAuthAgentAvailable:
-            signaler.signal(signaler.EIP_NO_POLKIT_AGENT_ERROR)
+            signaler.signal(signaler.eip_no_polkit_agent_error)
         except linuxvpnlauncher.EIPNoPkexecAvailable:
-            signaler.signal(signaler.EIP_NO_PKEXEC_ERROR)
+            signaler.signal(signaler.eip_no_pkexec_error)
         except darwinvpnlauncher.EIPNoTunKextLoaded:
-            signaler.signal(signaler.EIP_NO_TUN_KEXT_ERROR)
+            signaler.signal(signaler.eip_no_tun_kext_error)
         except Exception as e:
             logger.error("Unexpected problem: {0!r}".format(e))
         else:
@@ -482,12 +483,12 @@ class EIP(object):
 
         while retry <= MAX_FW_WAIT_RETRIES:
             if self._vpn.is_fw_down():
-                self._signaler.signal(self._signaler.EIP_STOPPED)
+                self._signaler.signal(self._signaler.eip_stopped)
                 return
             else:
-                #msg = "Firewall is not down yet, waiting... {0} of {1}"
-                #msg = msg.format(retry, MAX_FW_WAIT_RETRIES)
-                #logger.debug(msg)
+                # msg = "Firewall is not down yet, waiting... {0} of {1}"
+                # msg = msg.format(retry, MAX_FW_WAIT_RETRIES)
+                # logger.debug(msg)
                 time.sleep(FW_WAIT_STEP)
                 retry += 1
         logger.warning("After waiting, firewall is not down... "
@@ -542,7 +543,7 @@ class EIP(object):
             filtered_domains.append((domain, is_initialized))
 
         if self._signaler is not None:
-            self._signaler.signal(self._signaler.EIP_GET_INITIALIZED_PROVIDERS,
+            self._signaler.signal(self._signaler.eip_get_initialized_providers,
                                   filtered_domains)
 
     def tear_fw_down(self):
@@ -566,7 +567,7 @@ class EIP(object):
         if not self._provider_is_initialized(domain):
             if self._signaler is not None:
                 self._signaler.signal(
-                    self._signaler.EIP_UNINITIALIZED_PROVIDER)
+                    self._signaler.eip_uninitialized_provider)
             return
 
         eip_config = eipconfig.EIPConfig()
@@ -580,14 +581,55 @@ class EIP(object):
         if not eip_loaded or provider_config is None:
             if self._signaler is not None:
                 self._signaler.signal(
-                    self._signaler.EIP_GET_GATEWAYS_LIST_ERROR)
+                    self._signaler.eip_get_gateways_list_error)
             return
 
         gateways = eipconfig.VPNGatewaySelector(eip_config).get_gateways_list()
 
         if self._signaler is not None:
             self._signaler.signal(
-                self._signaler.EIP_GET_GATEWAYS_LIST, gateways)
+                self._signaler.eip_get_gateways_list, gateways)
+
+    def get_gateway_country_code(self, domain):
+        """
+        Signal the country code for the currently used gateway for the given
+        provider.
+
+        :param domain: the domain to get country code.
+        :type domain: str
+
+        Signals:
+            eip_get_gateway_country_code -> str
+            eip_no_gateway
+        """
+        settings = Settings()
+
+        eip_config = eipconfig.EIPConfig()
+        provider_config = ProviderConfig.get_provider_config(domain)
+
+        api_version = provider_config.get_api_version()
+        eip_config.set_api_version(api_version)
+        eip_config.load(eipconfig.get_eipconfig_path(domain))
+
+        gateway_selector = eipconfig.VPNGatewaySelector(eip_config)
+        gateway_conf = settings.get_selected_gateway(domain)
+
+        if gateway_conf == GATEWAY_AUTOMATIC:
+            gateways = gateway_selector.get_gateways()
+        else:
+            gateways = [gateway_conf]
+
+        if not gateways:
+            self._signaler.signal(self._signaler.eip_no_gateway)
+            return
+
+        # this only works for selecting the first gateway, as we're
+        # currently doing.
+        ccodes = gateway_selector.get_gateways_country_code()
+        gateway_ccode = ccodes[gateways[0]]
+
+        self._signaler.signal(self._signaler.eip_get_gateway_country_code,
+                              gateway_ccode)
 
     def _can_start(self, domain):
         """
@@ -607,7 +649,8 @@ class EIP(object):
         launcher = get_vpn_launcher()
         ovpn_path = force_eval(launcher.OPENVPN_BIN_PATH)
         if not os.path.isfile(ovpn_path):
-            logger.error("Cannot start OpenVPN, binary not found")
+            logger.error("Cannot start OpenVPN, binary not found: %s" %
+                         (ovpn_path,))
             return False
 
         # check for other problems
@@ -643,10 +686,10 @@ class EIP(object):
         """
         if self._can_start(domain):
             if self._signaler is not None:
-                self._signaler.signal(self._signaler.EIP_CAN_START)
+                self._signaler.signal(self._signaler.eip_can_start)
         else:
             if self._signaler is not None:
-                self._signaler.signal(self._signaler.EIP_CANNOT_START)
+                self._signaler.signal(self._signaler.eip_cannot_start)
 
     def check_dns(self, domain):
         """
@@ -665,7 +708,7 @@ class EIP(object):
             """
             Callback handler for `do_check`.
             """
-            self._signaler.signal(self._signaler.EIP_DNS_OK)
+            self._signaler.signal(self._signaler.eip_dns_ok)
             logger.debug("DNS check OK")
 
         def check_err(failure):
@@ -677,7 +720,7 @@ class EIP(object):
             """
             logger.debug("Can't resolve hostname. {0!r}".format(failure))
 
-            self._signaler.signal(self._signaler.EIP_DNS_ERROR)
+            self._signaler.signal(self._signaler.eip_dns_error)
 
             # python 2.7.4 raises socket.error
             # python 2.7.5 raises socket.gaierror
@@ -737,7 +780,7 @@ class Soledad(object):
             self._soledad_defer.addCallback(self._set_proxies_cb)
         else:
             if self._signaler is not None:
-                self._signaler.signal(self._signaler.SOLEDAD_BOOTSTRAP_FAILED)
+                self._signaler.signal(self._signaler.soledad_bootstrap_failed)
             logger.error("Could not load provider configuration.")
 
         return self._soledad_defer
@@ -793,7 +836,7 @@ class Soledad(object):
         Password change callback.
         """
         if self._signaler is not None:
-            self._signaler.signal(self._signaler.SOLEDAD_PASSWORD_CHANGE_OK)
+            self._signaler.signal(self._signaler.soledad_password_change_ok)
 
     def _change_password_error(self, failure):
         """
@@ -808,7 +851,7 @@ class Soledad(object):
             logger.error("Passphrase too short.")
 
         if self._signaler is not None:
-            self._signaler.signal(self._signaler.SOLEDAD_PASSWORD_CHANGE_ERROR)
+            self._signaler.signal(self._signaler.soledad_password_change_error)
 
     def change_password(self, new_password):
         """
@@ -866,7 +909,7 @@ class Keymanager(object):
                 new_key = keys_file.read()
         except IOError as e:
             logger.error("IOError importing key. {0!r}".format(e))
-            signal = self._signaler.KEYMANAGER_IMPORT_IOERROR
+            signal = self._signaler.keymanager_import_ioerror
             self._signaler.signal(signal)
             return
 
@@ -876,19 +919,19 @@ class Keymanager(object):
                 new_key)
         except (KeyAddressMismatch, KeyFingerprintMismatch) as e:
             logger.error(repr(e))
-            signal = self._signaler.KEYMANAGER_IMPORT_DATAMISMATCH
+            signal = self._signaler.keymanager_import_datamismatch
             self._signaler.signal(signal)
             return
 
         if public_key is None or private_key is None:
-            signal = self._signaler.KEYMANAGER_IMPORT_MISSINGKEY
+            signal = self._signaler.keymanager_import_missingkey
             self._signaler.signal(signal)
             return
 
         current_public_key = keymanager.get_key(username, openpgp.OpenPGPKey)
         if public_key.address != current_public_key.address:
             logger.error("The key does not match the ID")
-            signal = self._signaler.KEYMANAGER_IMPORT_ADDRESSMISMATCH
+            signal = self._signaler.keymanager_import_addressmismatch
             self._signaler.signal(signal)
             return
 
@@ -899,7 +942,7 @@ class Keymanager(object):
         keymanager.send_key(openpgp.OpenPGPKey)
 
         logger.debug('Import ok')
-        signal = self._signaler.KEYMANAGER_IMPORT_OK
+        signal = self._signaler.keymanager_import_ok
 
         self._signaler.signal(signal)
 
@@ -923,17 +966,17 @@ class Keymanager(object):
                 keys_file.write(private_key.key_data)
 
             logger.debug('Export ok')
-            self._signaler.signal(self._signaler.KEYMANAGER_EXPORT_OK)
+            self._signaler.signal(self._signaler.keymanager_export_ok)
         except IOError as e:
             logger.error("IOError exporting key. {0!r}".format(e))
-            self._signaler.signal(self._signaler.KEYMANAGER_EXPORT_ERROR)
+            self._signaler.signal(self._signaler.keymanager_export_error)
 
     def list_keys(self):
         """
         List all the keys stored in the local DB.
         """
         keys = self._keymanager_proxy.get_all_keys_in_local_db()
-        self._signaler.signal(self._signaler.KEYMANAGER_KEYS_LIST, keys)
+        self._signaler.signal(self._signaler.keymanager_keys_list, keys)
 
     def get_key_details(self, username):
         """
@@ -942,7 +985,7 @@ class Keymanager(object):
         public_key = self._keymanager_proxy.get_key(username,
                                                     openpgp.OpenPGPKey)
         details = (public_key.key_id, public_key.fingerprint)
-        self._signaler.signal(self._signaler.KEYMANAGER_KEY_DETAILS, details)
+        self._signaler.signal(self._signaler.keymanager_key_details, details)
 
 
 class Mail(object):
@@ -1027,7 +1070,7 @@ class Mail(object):
         logger.debug('Waiting for imap service to stop.')
         cv.wait(self.SERVICE_STOP_TIMEOUT)
         logger.debug('IMAP stopped')
-        self._signaler.signal(self._signaler.IMAP_STOPPED)
+        self._signaler.signal(self._signaler.imap_stopped)
 
     def stop_imap_service(self):
         """
@@ -1080,7 +1123,7 @@ class Authenticate(object):
             return self._login_defer
         else:
             if self._signaler is not None:
-                self._signaler.signal(self._signaler.SRP_AUTH_ERROR)
+                self._signaler.signal(self._signaler.srp_auth_error)
             logger.error("Could not load provider configuration.")
 
     def cancel_login(self):
@@ -1105,7 +1148,7 @@ class Authenticate(object):
         """
         if not self._is_logged_in():
             if self._signaler is not None:
-                self._signaler.signal(self._signaler.SRP_NOT_LOGGED_IN_ERROR)
+                self._signaler.signal(self._signaler.srp_not_logged_in_error)
             return
 
         return self._srp_auth.change_password(current_password, new_password)
@@ -1117,7 +1160,7 @@ class Authenticate(object):
         """
         if not self._is_logged_in():
             if self._signaler is not None:
-                self._signaler.signal(self._signaler.SRP_NOT_LOGGED_IN_ERROR)
+                self._signaler.signal(self._signaler.srp_not_logged_in_error)
             return
 
         self._srp_auth.logout()
@@ -1140,8 +1183,8 @@ class Authenticate(object):
 
         signal = None
         if self._is_logged_in():
-            signal = self._signaler.SRP_STATUS_LOGGED_IN
+            signal = self._signaler.srp_status_logged_in
         else:
-            signal = self._signaler.SRP_STATUS_NOT_LOGGED_IN
+            signal = self._signaler.srp_status_not_logged_in
 
         self._signaler.signal(signal)
diff --git a/src/leap/bitmask/backend/leapbackend.py b/src/leap/bitmask/backend/leapbackend.py
index 3c5222f4..d3c4fcda 100644
--- a/src/leap/bitmask/backend/leapbackend.py
+++ b/src/leap/bitmask/backend/leapbackend.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # leapbackend.py
-# Copyright (C) 2013 LEAP
+# Copyright (C) 2013, 2014 LEAP
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -15,178 +15,65 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 """
-Backend for GUI/Logic communication.
+Backend for everything
 """
 import logging
 
-from Queue import Queue, Empty
-
-from twisted.internet import reactor
-from twisted.internet import threads, defer
-from twisted.internet.task import LoopingCall
-
 import zope.interface
 import zope.proxy
 
-from leap.bitmask.backend.leapsignaler import Signaler
 from leap.bitmask.backend import components
+from leap.bitmask.backend.backend import Backend
+from leap.bitmask.backend.settings import Settings
 
 logger = logging.getLogger(__name__)
 
+ERROR_KEY = "error"
+PASSED_KEY = "passed"
+
 
-class Backend(object):
+class LeapBackend(Backend):
     """
-    Backend for everything, the UI should only use this class.
+    Backend server subclass, used to implement the API methods.
     """
-
-    PASSED_KEY = "passed"
-    ERROR_KEY = "error"
-
     def __init__(self, bypass_checks=False):
         """
         Constructor for the backend.
         """
-        # Components map for the commands received
-        self._components = {}
-
-        # Ongoing defers that will be cancelled at stop time
-        self._ongoing_defers = []
+        Backend.__init__(self)
 
-        # Signaler object to translate commands into Qt signals
-        self._signaler = Signaler()
+        self._settings = Settings()
 
         # Objects needed by several components, so we make a proxy and pass
         # them around
         self._soledad_proxy = zope.proxy.ProxyBase(None)
         self._keymanager_proxy = zope.proxy.ProxyBase(None)
 
-        # Component registration
-        self._register(components.Provider(self._signaler, bypass_checks))
-        self._register(components.Register(self._signaler))
-        self._register(components.Authenticate(self._signaler))
-        self._register(components.EIP(self._signaler))
-        self._register(components.Soledad(self._soledad_proxy,
-                                          self._keymanager_proxy,
-                                          self._signaler))
-        self._register(components.Keymanager(self._keymanager_proxy,
-                                             self._signaler))
-        self._register(components.Mail(self._soledad_proxy,
-                                       self._keymanager_proxy,
-                                       self._signaler))
-
-        # We have a looping call on a thread executing all the
-        # commands in queue. Right now this queue is an actual Queue
-        # object, but it'll become the zmq recv_multipart queue
-        self._lc = LoopingCall(threads.deferToThread, self._worker)
-
-        # Temporal call_queue for worker, will be replaced with
-        # recv_multipart os something equivalent in the loopingcall
-        self._call_queue = Queue()
-
-    @property
-    def signaler(self):
-        """
-        Public signaler access to let the UI connect to its signals.
-        """
-        return self._signaler
-
-    def start(self):
-        """
-        Starts the looping call
-        """
-        logger.debug("Starting worker...")
-        self._lc.start(0.01)
-
-    def stop(self):
-        """
-        Stops the looping call and tries to cancel all the defers.
-        """
-        reactor.callLater(2, self._stop)
-
-    def _stop(self):
-        """
-        Delayed stopping of worker. Called from `stop`.
-        """
-        logger.debug("Stopping worker...")
-        if self._lc.running:
-            self._lc.stop()
-        else:
-            logger.warning("Looping call is not running, cannot stop")
-
-        logger.debug("Cancelling ongoing defers...")
-        while len(self._ongoing_defers) > 0:
-            d = self._ongoing_defers.pop()
-            d.cancel()
-        logger.debug("Defers cancelled.")
-
-    def _register(self, component):
-        """
-        Registers a component in this backend
-
-        :param component: Component to register
-        :type component: any object that implements ILEAPComponent
-        """
-        # TODO: assert that the component implements the interfaces
-        # expected
-        try:
-            self._components[component.key] = component
-        except Exception:
-            logger.error("There was a problem registering %s" % (component,))
-
-    def _signal_back(self, _, signal):
-        """
-        Helper method to signal back (callback like behavior) to the
-        UI that an operation finished.
-
-        :param signal: signal name
-        :type signal: str
-        """
-        self._signaler.signal(signal)
-
-    def _worker(self):
-        """
-        Worker method, called from a different thread and as a part of
-        a looping call
-        """
-        try:
-            # this'll become recv_multipart
-            cmd = self._call_queue.get(block=False)
-
-            # cmd is: component, method, signalback, *args
-            func = getattr(self._components[cmd[0]], cmd[1])
-            d = func(*cmd[3:])
-            if d is not None:  # d may be None if a defer chain is cancelled.
-                # A call might not have a callback signal, but if it does,
-                # we add it to the chain
-                if cmd[2] is not None:
-                    d.addCallbacks(self._signal_back, logger.error, cmd[2])
-                d.addCallbacks(self._done_action, logger.error,
-                               callbackKeywords={"d": d})
-                d.addErrback(logger.error)
-                self._ongoing_defers.append(d)
-        except Empty:
-            # If it's just empty we don't have anything to do.
-            pass
-        except defer.CancelledError:
-            logger.debug("defer cancelled somewhere (CancelledError).")
-        except Exception as e:
-            # But we log the rest
-            logger.exception("Unexpected exception: {0!r}".format(e))
+        # Component instances creation
+        self._provider = components.Provider(self._signaler, bypass_checks)
+        self._register = components.Register(self._signaler)
+        self._authenticate = components.Authenticate(self._signaler)
+        self._eip = components.EIP(self._signaler)
+        self._soledad = components.Soledad(self._soledad_proxy,
+                                           self._keymanager_proxy,
+                                           self._signaler)
+        self._keymanager = components.Keymanager(self._keymanager_proxy,
+                                                 self._signaler)
+        self._mail = components.Mail(self._soledad_proxy,
+                                     self._keymanager_proxy,
+                                     self._signaler)
 
-    def _done_action(self, _, d):
+    def _check_type(self, obj, expected_type):
         """
-        Remover of the defer once it's done
+        Check the type of a parameter.
 
-        :param d: defer to remove
-        :type d: twisted.internet.defer.Deferred
+        :param obj: object to check its type.
+        :type obj: any type
+        :param expected_type: the expected type of the object.
+        :type expected_type: type
         """
-        if d in self._ongoing_defers:
-            self._ongoing_defers.remove(d)
-
-    # XXX: Temporal interface until we migrate to zmq
-    # We simulate the calls to zmq.send_multipart. Once we separate
-    # this in two processes, the methods bellow can be changed to
-    # send_multipart and this backend class will be really simple.
+        if not isinstance(obj, expected_type):
+            raise TypeError("The parameter type is incorrect.")
 
     def provider_setup(self, provider):
         """
@@ -202,13 +89,13 @@ class Backend(object):
             prov_https_connection       -> { PASSED_KEY: bool, ERROR_KEY: str }
             prov_download_provider_info -> { PASSED_KEY: bool, ERROR_KEY: str }
         """
-        self._call_queue.put(("provider", "setup_provider", None, provider))
+        self._provider.setup_provider(provider)
 
     def provider_cancel_setup(self):
         """
         Cancel the ongoing setup provider (if any).
         """
-        self._call_queue.put(("provider", "cancel_setup_provider", None))
+        self._provider.cancel_setup_provider()
 
     def provider_bootstrap(self, provider):
         """
@@ -223,7 +110,7 @@ class Backend(object):
             prov_check_ca_fingerprint  -> {PASSED_KEY: bool, ERROR_KEY: str}
             prov_check_api_certificate -> {PASSED_KEY: bool, ERROR_KEY: str}
         """
-        self._call_queue.put(("provider", "bootstrap", None, provider))
+        self._provider.bootstrap(provider)
 
     def provider_get_supported_services(self, domain):
         """
@@ -235,8 +122,7 @@ class Backend(object):
         Signals:
             prov_get_supported_services -> list of unicode
         """
-        self._call_queue.put(("provider", "get_supported_services", None,
-                              domain))
+        self._provider.get_supported_services(domain)
 
     def provider_get_all_services(self, providers):
         """
@@ -248,13 +134,11 @@ class Backend(object):
         Signals:
             prov_get_all_services -> list of unicode
         """
-        self._call_queue.put(("provider", "get_all_services", None,
-                              providers))
+        self._provider.get_all_services(providers)
 
     def provider_get_details(self, domain, lang):
         """
-        Signal a ProviderConfigLight object with the current ProviderConfig
-        settings.
+        Signal a dict with the current ProviderConfig settings.
 
         :param domain: the domain name of the provider.
         :type domain: str
@@ -262,9 +146,9 @@ class Backend(object):
         :type lang: str
 
         Signals:
-            prov_get_details -> ProviderConfigLight
+            prov_get_details -> dict
         """
-        self._call_queue.put(("provider", "get_details", None, domain, lang))
+        self._provider.get_details(domain, lang)
 
     def provider_get_pinned_providers(self):
         """
@@ -273,7 +157,7 @@ class Backend(object):
         Signals:
             prov_get_pinned_providers -> list of provider domains
         """
-        self._call_queue.put(("provider", "get_pinned_providers", None))
+        self._provider.get_pinned_providers()
 
     def user_register(self, provider, username, password):
         """
@@ -291,8 +175,7 @@ class Backend(object):
             srp_registration_taken
             srp_registration_failed
         """
-        self._call_queue.put(("register", "register_user", None, provider,
-                              username, password))
+        self._register.register_user(provider, username, password)
 
     def eip_setup(self, provider, skip_network=False):
         """
@@ -309,14 +192,13 @@ class Backend(object):
             eip_client_certificate_ready -> {PASSED_KEY: bool, ERROR_KEY: str}
             eip_cancelled_setup
         """
-        self._call_queue.put(("eip", "setup_eip", None, provider,
-                              skip_network))
+        self._eip.setup_eip(provider, skip_network)
 
     def eip_cancel_setup(self):
         """
         Cancel the ongoing setup EIP (if any).
         """
-        self._call_queue.put(("eip", "cancel_setup_eip", None))
+        self._eip.cancel_setup_eip()
 
     def eip_start(self, restart=False):
         """
@@ -343,7 +225,7 @@ class Backend(object):
         :param restart: whether is is a restart.
         :type restart: bool
         """
-        self._call_queue.put(("eip", "start", None, restart))
+        self._eip.start(restart)
 
     def eip_stop(self, shutdown=False, restart=False, failed=False):
         """
@@ -355,13 +237,13 @@ class Backend(object):
         :param restart: whether this is part of a restart.
         :type restart: bool
         """
-        self._call_queue.put(("eip", "stop", None, shutdown, restart))
+        self._eip.stop(shutdown, restart)
 
     def eip_terminate(self):
         """
         Terminate the EIP service, not necessarily in a nice way.
         """
-        self._call_queue.put(("eip", "terminate", None))
+        self._eip.terminate()
 
     def eip_get_gateways_list(self, domain):
         """
@@ -370,16 +252,25 @@ class Backend(object):
         :param domain: the domain to get the gateways.
         :type domain: str
 
-        # TODO discuss how to document the expected result object received of
-        # the signal
-        :signal type: list of str
-
         Signals:
             eip_get_gateways_list -> list of unicode
             eip_get_gateways_list_error
             eip_uninitialized_provider
         """
-        self._call_queue.put(("eip", "get_gateways_list", None, domain))
+        self._eip.get_gateways_list(domain)
+
+    def eip_get_gateway_country_code(self, domain):
+        """
+        Signal a list of gateways for the given provider.
+
+        :param domain: the domain to get the gateways.
+        :type domain: str
+
+        Signals:
+            eip_get_gateways_list -> str
+            eip_no_gateway
+        """
+        self._eip.get_gateway_country_code(domain)
 
     def eip_get_initialized_providers(self, domains):
         """
@@ -392,8 +283,7 @@ class Backend(object):
             eip_get_initialized_providers -> list of tuple(unicode, bool)
 
         """
-        self._call_queue.put(("eip", "get_initialized_providers",
-                              None, domains))
+        self._eip.get_initialized_providers(domains)
 
     def eip_can_start(self, domain):
         """
@@ -406,8 +296,7 @@ class Backend(object):
             eip_can_start
             eip_cannot_start
         """
-        self._call_queue.put(("eip", "can_start",
-                              None, domain))
+        self._eip.can_start(domain)
 
     def eip_check_dns(self, domain):
         """
@@ -420,13 +309,13 @@ class Backend(object):
             eip_dns_ok
             eip_dns_error
         """
-        self._call_queue.put(("eip", "check_dns", None, domain))
+        self._eip.check_dns(domain)
 
     def tear_fw_down(self):
         """
         Signal the need to tear the fw down.
         """
-        self._call_queue.put(("eip", "tear_fw_down", None))
+        self._eip.tear_fw_down()
 
     def user_login(self, provider, username, password):
         """
@@ -447,8 +336,7 @@ class Backend(object):
             srp_auth_connection_error
             srp_auth_error
         """
-        self._call_queue.put(("authenticate", "login", None, provider,
-                              username, password))
+        self._authenticate.login(provider, username, password)
 
     def user_logout(self):
         """
@@ -459,13 +347,13 @@ class Backend(object):
             srp_logout_error
             srp_not_logged_in_error
         """
-        self._call_queue.put(("authenticate", "logout", None))
+        self._authenticate.logout()
 
     def user_cancel_login(self):
         """
         Cancel the ongoing login (if any).
         """
-        self._call_queue.put(("authenticate", "cancel_login", None))
+        self._authenticate.cancel_login()
 
     def user_change_password(self, current_password, new_password):
         """
@@ -482,8 +370,7 @@ class Backend(object):
             srp_password_change_badpw
             srp_password_change_error
         """
-        self._call_queue.put(("authenticate", "change_password", None,
-                              current_password, new_password))
+        self._authenticate.change_password(current_password, new_password)
 
     def soledad_change_password(self, new_password):
         """
@@ -498,8 +385,7 @@ class Backend(object):
             srp_password_change_badpw
             srp_password_change_error
         """
-        self._call_queue.put(("soledad", "change_password", None,
-                              new_password))
+        self._soledad.change_password(new_password)
 
     def user_get_logged_in_status(self):
         """
@@ -509,7 +395,7 @@ class Backend(object):
             srp_status_logged_in
             srp_status_not_logged_in
         """
-        self._call_queue.put(("authenticate", "get_logged_in_status", None))
+        self._authenticate.get_logged_in_status()
 
     def soledad_bootstrap(self, username, domain, password):
         """
@@ -527,8 +413,10 @@ class Backend(object):
             soledad_bootstrap_failed
             soledad_invalid_auth_token
         """
-        self._call_queue.put(("soledad", "bootstrap", None,
-                              username, domain, password))
+        self._check_type(username, unicode)
+        self._check_type(domain, unicode)
+        self._check_type(password, unicode)
+        self._soledad.bootstrap(username, domain, password)
 
     def soledad_load_offline(self, username, password, uuid):
         """
@@ -543,20 +431,19 @@ class Backend(object):
 
         Signals:
         """
-        self._call_queue.put(("soledad", "load_offline", None,
-                              username, password, uuid))
+        self._soledad.load_offline(username, password, uuid)
 
     def soledad_cancel_bootstrap(self):
         """
         Cancel the ongoing soledad bootstrapping process (if any).
         """
-        self._call_queue.put(("soledad", "cancel_bootstrap", None))
+        self._soledad.cancel_bootstrap()
 
     def soledad_close(self):
         """
         Close soledad database.
         """
-        self._call_queue.put(("soledad", "close", None))
+        self._soledad.close()
 
     def keymanager_list_keys(self):
         """
@@ -565,7 +452,7 @@ class Backend(object):
         Signals:
             keymanager_keys_list -> list
         """
-        self._call_queue.put(("keymanager", "list_keys", None))
+        self._keymanager.list_keys()
 
     def keymanager_export_keys(self, username, filename):
         """
@@ -580,8 +467,7 @@ class Backend(object):
             keymanager_export_ok
             keymanager_export_error
         """
-        self._call_queue.put(("keymanager", "export_keys", None,
-                              username, filename))
+        self._keymanager.export_keys(username, filename)
 
     def keymanager_get_key_details(self, username):
         """
@@ -593,7 +479,7 @@ class Backend(object):
         Signals:
             keymanager_key_details
         """
-        self._call_queue.put(("keymanager", "get_key_details", None, username))
+        self._keymanager.get_key_details(username)
 
     def smtp_start_service(self, full_user_id, download_if_needed=False):
         """
@@ -605,8 +491,7 @@ class Backend(object):
                                    for the file
         :type download_if_needed: bool
         """
-        self._call_queue.put(("mail", "start_smtp_service", None,
-                              full_user_id, download_if_needed))
+        self._mail.start_smtp_service(full_user_id, download_if_needed)
 
     def imap_start_service(self, full_user_id, offline=False):
         """
@@ -617,14 +502,13 @@ class Backend(object):
         :param offline: whether imap should start in offline mode or not.
         :type offline: bool
         """
-        self._call_queue.put(("mail", "start_imap_service", None,
-                              full_user_id, offline))
+        self._mail.start_imap_service(full_user_id, offline)
 
     def smtp_stop_service(self):
         """
         Stop the SMTP service.
         """
-        self._call_queue.put(("mail", "stop_smtp_service", None))
+        self._mail.stop_smtp_service()
 
     def imap_stop_service(self):
         """
@@ -633,4 +517,15 @@ class Backend(object):
         Signals:
             imap_stopped
         """
-        self._call_queue.put(("mail", "stop_imap_service", None))
+        self._mail.stop_imap_service()
+
+    def settings_set_selected_gateway(self, provider, gateway):
+        """
+        Set the selected gateway for a given provider.
+
+        :param provider: provider domain
+        :type provider: str
+        :param gateway: gateway to use as default
+        :type gateway: str
+        """
+        self._settings.set_selected_gateway(provider, gateway)
diff --git a/src/leap/bitmask/backend/leapsignaler.py b/src/leap/bitmask/backend/leapsignaler.py
index da8908fd..a36e6fdc 100644
--- a/src/leap/bitmask/backend/leapsignaler.py
+++ b/src/leap/bitmask/backend/leapsignaler.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# components.py
+# leapsignaler.py
 # Copyright (C) 2013 LEAP
 #
 # This program is free software: you can redistribute it and/or modify
@@ -15,371 +15,101 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 """
-Signaler for Backend/Frontend communication.
+Signaling server, used to define the API signals.
 """
-import logging
-
 from PySide import QtCore
 
-logger = logging.getLogger(__name__)
+from leap.bitmask.backend.signaler_qt import SignalerQt
 
 
-class Signaler(QtCore.QObject):
+class LeapSignaler(SignalerQt):
     """
-    Signaler object, handles converting string commands to Qt signals.
-
-    This is intended for the separation in frontend/backend, this will
-    live in the frontend.
+    Signaling server subclass, used to define the API signals.
     """
+    backend_bad_call = QtCore.Signal(object)
 
-    ####################
-    # These will only exist in the frontend
-    # Signals for the ProviderBootstrapper
-    prov_name_resolution = QtCore.Signal(object)
-    prov_https_connection = QtCore.Signal(object)
-    prov_download_provider_info = QtCore.Signal(object)
-
-    prov_download_ca_cert = QtCore.Signal(object)
-    prov_check_ca_fingerprint = QtCore.Signal(object)
-    prov_check_api_certificate = QtCore.Signal(object)
-
-    prov_problem_with_provider = QtCore.Signal(object)
-
-    prov_unsupported_client = QtCore.Signal(object)
-    prov_unsupported_api = QtCore.Signal(object)
-
-    prov_get_all_services = QtCore.Signal(object)
-    prov_get_supported_services = QtCore.Signal(object)
-    prov_get_details = QtCore.Signal(object)
-    prov_get_pinned_providers = QtCore.Signal(object)
-
-    prov_cancelled_setup = QtCore.Signal(object)
-
-    # Signals for SRPRegister
-    srp_registration_finished = QtCore.Signal(object)
-    srp_registration_failed = QtCore.Signal(object)
-    srp_registration_taken = QtCore.Signal(object)
-
-    # Signals for EIP bootstrapping
-    eip_config_ready = QtCore.Signal(object)
+    eip_alien_openvpn_already_running = QtCore.Signal()
+    eip_can_start = QtCore.Signal()
+    eip_cancelled_setup = QtCore.Signal()
+    eip_cannot_start = QtCore.Signal()
     eip_client_certificate_ready = QtCore.Signal(object)
-
-    eip_cancelled_setup = QtCore.Signal(object)
-
-    # Signals for SRPAuth
-    srp_auth_ok = QtCore.Signal(object)
-    srp_auth_error = QtCore.Signal(object)
-    srp_auth_server_error = QtCore.Signal(object)
-    srp_auth_connection_error = QtCore.Signal(object)
-    srp_auth_bad_user_or_password = QtCore.Signal(object)
-    srp_logout_ok = QtCore.Signal(object)
-    srp_logout_error = QtCore.Signal(object)
-    srp_password_change_ok = QtCore.Signal(object)
-    srp_password_change_error = QtCore.Signal(object)
-    srp_password_change_badpw = QtCore.Signal(object)
-    srp_not_logged_in_error = QtCore.Signal(object)
-    srp_status_logged_in = QtCore.Signal(object)
-    srp_status_not_logged_in = QtCore.Signal(object)
-
-    # Signals for EIP
-    eip_connected = QtCore.Signal(object)
-    eip_disconnected = QtCore.Signal(object)
+    eip_config_ready = QtCore.Signal(object)
+    eip_connected = QtCore.Signal()
+    eip_connection_aborted = QtCore.Signal()
     eip_connection_died = QtCore.Signal(object)
-    eip_connection_aborted = QtCore.Signal(object)
-    eip_stopped = QtCore.Signal(object)
-
-    eip_dns_ok = QtCore.Signal(object)
-    eip_dns_error = QtCore.Signal(object)
-
-    # EIP problems
-    eip_no_polkit_agent_error = QtCore.Signal(object)
-    eip_no_tun_kext_error = QtCore.Signal(object)
-    eip_no_pkexec_error = QtCore.Signal(object)
-    eip_openvpn_not_found_error = QtCore.Signal(object)
-    eip_openvpn_already_running = QtCore.Signal(object)
-    eip_alien_openvpn_already_running = QtCore.Signal(object)
-    eip_vpn_launcher_exception = QtCore.Signal(object)
-
+    eip_disconnected = QtCore.Signal(object)
+    eip_dns_error = QtCore.Signal()
+    eip_dns_ok = QtCore.Signal()
+    eip_get_gateway_country_code = QtCore.Signal(object)
     eip_get_gateways_list = QtCore.Signal(object)
-    eip_get_gateways_list_error = QtCore.Signal(object)
-    eip_uninitialized_provider = QtCore.Signal(object)
+    eip_get_gateways_list_error = QtCore.Signal()
     eip_get_initialized_providers = QtCore.Signal(object)
-
-    # signals from parsing openvpn output
-    eip_network_unreachable = QtCore.Signal(object)
-    eip_process_restart_tls = QtCore.Signal(object)
-    eip_process_restart_ping = QtCore.Signal(object)
-
-    # signals from vpnprocess.py
+    eip_network_unreachable = QtCore.Signal()
+    eip_no_gateway = QtCore.Signal()
+    eip_no_pkexec_error = QtCore.Signal()
+    eip_no_polkit_agent_error = QtCore.Signal()
+    eip_no_tun_kext_error = QtCore.Signal()
+    eip_openvpn_already_running = QtCore.Signal()
+    eip_openvpn_not_found_error = QtCore.Signal()
+    eip_process_finished = QtCore.Signal(int)
+    eip_process_restart_ping = QtCore.Signal()
+    eip_process_restart_tls = QtCore.Signal()
     eip_state_changed = QtCore.Signal(dict)
     eip_status_changed = QtCore.Signal(dict)
-    eip_process_finished = QtCore.Signal(int)
+    eip_stopped = QtCore.Signal()
     eip_tear_fw_down = QtCore.Signal(object)
-
-    # signals whether the needed files to start EIP exist or not
-    eip_can_start = QtCore.Signal(object)
-    eip_cannot_start = QtCore.Signal(object)
-
-    # Signals for Soledad
-    soledad_bootstrap_failed = QtCore.Signal(object)
-    soledad_bootstrap_finished = QtCore.Signal(object)
-    soledad_offline_failed = QtCore.Signal(object)
-    soledad_offline_finished = QtCore.Signal(object)
-    soledad_invalid_auth_token = QtCore.Signal(object)
-    soledad_cancelled_bootstrap = QtCore.Signal(object)
-    soledad_password_change_ok = QtCore.Signal(object)
-    soledad_password_change_error = QtCore.Signal(object)
-
-    # Keymanager signals
-    keymanager_export_ok = QtCore.Signal(object)
-    keymanager_export_error = QtCore.Signal(object)
-    keymanager_keys_list = QtCore.Signal(object)
-
-    keymanager_import_ioerror = QtCore.Signal(object)
-    keymanager_import_datamismatch = QtCore.Signal(object)
-    keymanager_import_missingkey = QtCore.Signal(object)
-    keymanager_import_addressmismatch = QtCore.Signal(object)
-    keymanager_import_ok = QtCore.Signal(object)
-
+    eip_uninitialized_provider = QtCore.Signal()
+    eip_vpn_launcher_exception = QtCore.Signal()
+
+    imap_stopped = QtCore.Signal()
+
+    keymanager_export_error = QtCore.Signal()
+    keymanager_export_ok = QtCore.Signal()
+    keymanager_import_addressmismatch = QtCore.Signal()
+    keymanager_import_datamismatch = QtCore.Signal()
+    keymanager_import_ioerror = QtCore.Signal()
+    keymanager_import_missingkey = QtCore.Signal()
+    keymanager_import_ok = QtCore.Signal()
     keymanager_key_details = QtCore.Signal(object)
+    keymanager_keys_list = QtCore.Signal(object)
 
-    # mail related signals
-    imap_stopped = QtCore.Signal(object)
-
-    # This signal is used to warn the backend user that is doing something
-    # wrong
-    backend_bad_call = QtCore.Signal(object)
-
-    ####################
-    # These will exist both in the backend AND the front end.
-    # The frontend might choose to not "interpret" all the signals
-    # from the backend, but the backend needs to have all the signals
-    # it's going to emit defined here
-    PROV_NAME_RESOLUTION_KEY = "prov_name_resolution"
-    PROV_HTTPS_CONNECTION_KEY = "prov_https_connection"
-    PROV_DOWNLOAD_PROVIDER_INFO_KEY = "prov_download_provider_info"
-    PROV_DOWNLOAD_CA_CERT_KEY = "prov_download_ca_cert"
-    PROV_CHECK_CA_FINGERPRINT_KEY = "prov_check_ca_fingerprint"
-    PROV_CHECK_API_CERTIFICATE_KEY = "prov_check_api_certificate"
-    PROV_PROBLEM_WITH_PROVIDER_KEY = "prov_problem_with_provider"
-    PROV_UNSUPPORTED_CLIENT = "prov_unsupported_client"
-    PROV_UNSUPPORTED_API = "prov_unsupported_api"
-    PROV_CANCELLED_SETUP = "prov_cancelled_setup"
-    PROV_GET_ALL_SERVICES = "prov_get_all_services"
-    PROV_GET_SUPPORTED_SERVICES = "prov_get_supported_services"
-    PROV_GET_DETAILS = "prov_get_details"
-    PROV_GET_PINNED_PROVIDERS = "prov_get_pinned_providers"
-
-    SRP_REGISTRATION_FINISHED = "srp_registration_finished"
-    SRP_REGISTRATION_FAILED = "srp_registration_failed"
-    SRP_REGISTRATION_TAKEN = "srp_registration_taken"
-    SRP_AUTH_OK = "srp_auth_ok"
-    SRP_AUTH_ERROR = "srp_auth_error"
-    SRP_AUTH_SERVER_ERROR = "srp_auth_server_error"
-    SRP_AUTH_CONNECTION_ERROR = "srp_auth_connection_error"
-    SRP_AUTH_BAD_USER_OR_PASSWORD = "srp_auth_bad_user_or_password"
-    SRP_LOGOUT_OK = "srp_logout_ok"
-    SRP_LOGOUT_ERROR = "srp_logout_error"
-    SRP_PASSWORD_CHANGE_OK = "srp_password_change_ok"
-    SRP_PASSWORD_CHANGE_ERROR = "srp_password_change_error"
-    SRP_PASSWORD_CHANGE_BADPW = "srp_password_change_badpw"
-    SRP_NOT_LOGGED_IN_ERROR = "srp_not_logged_in_error"
-    SRP_STATUS_LOGGED_IN = "srp_status_logged_in"
-    SRP_STATUS_NOT_LOGGED_IN = "srp_status_not_logged_in"
-
-    EIP_CONFIG_READY = "eip_config_ready"
-    EIP_CLIENT_CERTIFICATE_READY = "eip_client_certificate_ready"
-    EIP_CANCELLED_SETUP = "eip_cancelled_setup"
-
-    EIP_CONNECTED = "eip_connected"
-    EIP_DISCONNECTED = "eip_disconnected"
-    EIP_CONNECTION_DIED = "eip_connection_died"
-    EIP_CONNECTION_ABORTED = "eip_connection_aborted"
-    EIP_STOPPED = "eip_stopped"
-
-    EIP_NO_POLKIT_AGENT_ERROR = "eip_no_polkit_agent_error"
-    EIP_NO_TUN_KEXT_ERROR = "eip_no_tun_kext_error"
-    EIP_NO_PKEXEC_ERROR = "eip_no_pkexec_error"
-    EIP_OPENVPN_NOT_FOUND_ERROR = "eip_openvpn_not_found_error"
-    EIP_OPENVPN_ALREADY_RUNNING = "eip_openvpn_already_running"
-    EIP_ALIEN_OPENVPN_ALREADY_RUNNING = "eip_alien_openvpn_already_running"
-    EIP_VPN_LAUNCHER_EXCEPTION = "eip_vpn_launcher_exception"
-
-    EIP_GET_GATEWAYS_LIST = "eip_get_gateways_list"
-    EIP_GET_GATEWAYS_LIST_ERROR = "eip_get_gateways_list_error"
-    EIP_UNINITIALIZED_PROVIDER = "eip_uninitialized_provider"
-    EIP_GET_INITIALIZED_PROVIDERS = "eip_get_initialized_providers"
-
-    EIP_NETWORK_UNREACHABLE = "eip_network_unreachable"
-    EIP_PROCESS_RESTART_TLS = "eip_process_restart_tls"
-    EIP_PROCESS_RESTART_PING = "eip_process_restart_ping"
-
-    EIP_STATE_CHANGED = "eip_state_changed"
-    EIP_STATUS_CHANGED = "eip_status_changed"
-    EIP_PROCESS_FINISHED = "eip_process_finished"
-    EIP_TEAR_FW_DOWN = "eip_tear_fw_down"
-
-    EIP_CAN_START = "eip_can_start"
-    EIP_CANNOT_START = "eip_cannot_start"
-
-    EIP_DNS_OK = "eip_dns_ok"
-    EIP_DNS_ERROR = "eip_dns_error"
-
-    SOLEDAD_BOOTSTRAP_FAILED = "soledad_bootstrap_failed"
-    SOLEDAD_BOOTSTRAP_FINISHED = "soledad_bootstrap_finished"
-    SOLEDAD_OFFLINE_FAILED = "soledad_offline_failed"
-    SOLEDAD_OFFLINE_FINISHED = "soledad_offline_finished"
-    SOLEDAD_INVALID_AUTH_TOKEN = "soledad_invalid_auth_token"
-
-    SOLEDAD_PASSWORD_CHANGE_OK = "soledad_password_change_ok"
-    SOLEDAD_PASSWORD_CHANGE_ERROR = "soledad_password_change_error"
-
-    SOLEDAD_CANCELLED_BOOTSTRAP = "soledad_cancelled_bootstrap"
-
-    KEYMANAGER_EXPORT_OK = "keymanager_export_ok"
-    KEYMANAGER_EXPORT_ERROR = "keymanager_export_error"
-    KEYMANAGER_KEYS_LIST = "keymanager_keys_list"
-
-    KEYMANAGER_IMPORT_IOERROR = "keymanager_import_ioerror"
-    KEYMANAGER_IMPORT_DATAMISMATCH = "keymanager_import_datamismatch"
-    KEYMANAGER_IMPORT_MISSINGKEY = "keymanager_import_missingkey"
-    KEYMANAGER_IMPORT_ADDRESSMISMATCH = "keymanager_import_addressmismatch"
-    KEYMANAGER_IMPORT_OK = "keymanager_import_ok"
-    KEYMANAGER_KEY_DETAILS = "keymanager_key_details"
-
-    IMAP_STOPPED = "imap_stopped"
-
-    BACKEND_BAD_CALL = "backend_bad_call"
-
-    def __init__(self):
-        """
-        Constructor for the Signaler
-        """
-        QtCore.QObject.__init__(self)
-        self._signals = {}
-
-        signals = [
-            self.PROV_NAME_RESOLUTION_KEY,
-            self.PROV_HTTPS_CONNECTION_KEY,
-            self.PROV_DOWNLOAD_PROVIDER_INFO_KEY,
-            self.PROV_DOWNLOAD_CA_CERT_KEY,
-            self.PROV_CHECK_CA_FINGERPRINT_KEY,
-            self.PROV_CHECK_API_CERTIFICATE_KEY,
-            self.PROV_PROBLEM_WITH_PROVIDER_KEY,
-            self.PROV_UNSUPPORTED_CLIENT,
-            self.PROV_UNSUPPORTED_API,
-            self.PROV_CANCELLED_SETUP,
-            self.PROV_GET_ALL_SERVICES,
-            self.PROV_GET_SUPPORTED_SERVICES,
-            self.PROV_GET_DETAILS,
-            self.PROV_GET_PINNED_PROVIDERS,
-
-            self.SRP_REGISTRATION_FINISHED,
-            self.SRP_REGISTRATION_FAILED,
-            self.SRP_REGISTRATION_TAKEN,
-
-            self.EIP_CONFIG_READY,
-            self.EIP_CLIENT_CERTIFICATE_READY,
-            self.EIP_CANCELLED_SETUP,
-
-            self.EIP_CONNECTED,
-            self.EIP_DISCONNECTED,
-            self.EIP_CONNECTION_DIED,
-            self.EIP_CONNECTION_ABORTED,
-            self.EIP_STOPPED,
-
-            self.EIP_NO_POLKIT_AGENT_ERROR,
-            self.EIP_NO_TUN_KEXT_ERROR,
-            self.EIP_NO_PKEXEC_ERROR,
-            self.EIP_OPENVPN_NOT_FOUND_ERROR,
-            self.EIP_OPENVPN_ALREADY_RUNNING,
-            self.EIP_ALIEN_OPENVPN_ALREADY_RUNNING,
-            self.EIP_VPN_LAUNCHER_EXCEPTION,
-
-            self.EIP_GET_GATEWAYS_LIST,
-            self.EIP_GET_GATEWAYS_LIST_ERROR,
-            self.EIP_UNINITIALIZED_PROVIDER,
-            self.EIP_GET_INITIALIZED_PROVIDERS,
-
-            self.EIP_NETWORK_UNREACHABLE,
-            self.EIP_PROCESS_RESTART_TLS,
-            self.EIP_PROCESS_RESTART_PING,
-
-            self.EIP_STATE_CHANGED,
-            self.EIP_STATUS_CHANGED,
-            self.EIP_PROCESS_FINISHED,
-
-            self.EIP_CAN_START,
-            self.EIP_CANNOT_START,
-
-            self.EIP_DNS_OK,
-            self.EIP_DNS_ERROR,
-
-            self.SRP_AUTH_OK,
-            self.SRP_AUTH_ERROR,
-            self.SRP_AUTH_SERVER_ERROR,
-            self.SRP_AUTH_CONNECTION_ERROR,
-            self.SRP_AUTH_BAD_USER_OR_PASSWORD,
-            self.SRP_LOGOUT_OK,
-            self.SRP_LOGOUT_ERROR,
-            self.SRP_PASSWORD_CHANGE_OK,
-            self.SRP_PASSWORD_CHANGE_ERROR,
-            self.SRP_PASSWORD_CHANGE_BADPW,
-            self.SRP_NOT_LOGGED_IN_ERROR,
-            self.SRP_STATUS_LOGGED_IN,
-            self.SRP_STATUS_NOT_LOGGED_IN,
-
-            self.SOLEDAD_BOOTSTRAP_FAILED,
-            self.SOLEDAD_BOOTSTRAP_FINISHED,
-            self.SOLEDAD_OFFLINE_FAILED,
-            self.SOLEDAD_OFFLINE_FINISHED,
-            self.SOLEDAD_INVALID_AUTH_TOKEN,
-            self.SOLEDAD_CANCELLED_BOOTSTRAP,
-
-            self.SOLEDAD_PASSWORD_CHANGE_OK,
-            self.SOLEDAD_PASSWORD_CHANGE_ERROR,
-
-            self.KEYMANAGER_EXPORT_OK,
-            self.KEYMANAGER_EXPORT_ERROR,
-            self.KEYMANAGER_KEYS_LIST,
-
-            self.KEYMANAGER_IMPORT_IOERROR,
-            self.KEYMANAGER_IMPORT_DATAMISMATCH,
-            self.KEYMANAGER_IMPORT_MISSINGKEY,
-            self.KEYMANAGER_IMPORT_ADDRESSMISMATCH,
-            self.KEYMANAGER_IMPORT_OK,
-            self.KEYMANAGER_KEY_DETAILS,
-
-            self.IMAP_STOPPED,
-
-            self.BACKEND_BAD_CALL,
-        ]
-
-        for sig in signals:
-            self._signals[sig] = getattr(self, sig)
-
-    def signal(self, key, data=None):
-        """
-        Emits a Qt signal based on the key provided, with the data if provided.
-
-        :param key: string identifying the signal to emit
-        :type key: str
-        :param data: object to send with the data
-        :type data: object
-
-        NOTE: The data object will be a serialized str in the backend,
-        and an unserialized object in the frontend, but for now we
-        just care about objects.
-        """
-        # Right now it emits Qt signals. The backend version of this
-        # will do zmq.send_multipart, and the frontend version will be
-        # similar to this
-
-        # for some reason emitting 'None' gives a segmentation fault.
-        if data is None:
-            data = ''
-
-        try:
-            self._signals[key].emit(data)
-        except KeyError:
-            logger.error("Unknown key for signal %s!" % (key,))
+    prov_cancelled_setup = QtCore.Signal()
+    prov_check_api_certificate = QtCore.Signal(object)
+    prov_check_ca_fingerprint = QtCore.Signal(object)
+    prov_download_ca_cert = QtCore.Signal(object)
+    prov_download_provider_info = QtCore.Signal(object)
+    prov_get_all_services = QtCore.Signal(object)
+    prov_get_details = QtCore.Signal(object)
+    prov_get_pinned_providers = QtCore.Signal(object)
+    prov_get_supported_services = QtCore.Signal(object)
+    prov_https_connection = QtCore.Signal(object)
+    prov_name_resolution = QtCore.Signal(object)
+    prov_problem_with_provider = QtCore.Signal()
+    prov_unsupported_api = QtCore.Signal()
+    prov_unsupported_client = QtCore.Signal()
+
+    soledad_bootstrap_failed = QtCore.Signal()
+    soledad_bootstrap_finished = QtCore.Signal()
+    soledad_cancelled_bootstrap = QtCore.Signal()
+    soledad_invalid_auth_token = QtCore.Signal()
+    soledad_offline_failed = QtCore.Signal()
+    soledad_offline_finished = QtCore.Signal()
+    soledad_password_change_error = QtCore.Signal()
+    soledad_password_change_ok = QtCore.Signal()
+
+    srp_auth_bad_user_or_password = QtCore.Signal()
+    srp_auth_connection_error = QtCore.Signal()
+    srp_auth_error = QtCore.Signal()
+    srp_auth_ok = QtCore.Signal()
+    srp_auth_server_error = QtCore.Signal()
+    srp_logout_error = QtCore.Signal()
+    srp_logout_ok = QtCore.Signal()
+    srp_not_logged_in_error = QtCore.Signal()
+    srp_password_change_badpw = QtCore.Signal()
+    srp_password_change_error = QtCore.Signal()
+    srp_password_change_ok = QtCore.Signal()
+    srp_registration_failed = QtCore.Signal()
+    srp_registration_finished = QtCore.Signal()
+    srp_registration_taken = QtCore.Signal()
+    srp_status_logged_in = QtCore.Signal()
+    srp_status_not_logged_in = QtCore.Signal()
diff --git a/src/leap/bitmask/backend/settings.py b/src/leap/bitmask/backend/settings.py
new file mode 100644
index 00000000..5cb4c616
--- /dev/null
+++ b/src/leap/bitmask/backend/settings.py
@@ -0,0 +1,158 @@
+# -*- coding: utf-8 -*-
+# settings.py
+# Copyright (C) 2013, 2014 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+Backend settings
+"""
+import ConfigParser
+import logging
+import os
+
+from leap.bitmask.util import get_path_prefix
+from leap.common.check import leap_assert, leap_assert_type
+
+logger = logging.getLogger(__name__)
+
+# We need this one available for the default decorator
+GATEWAY_AUTOMATIC = "Automatic"
+GENERAL_SECTION = "General"
+
+
+class Settings(object):
+    """
+    Leap backend settings hanler.
+    """
+    CONFIG_NAME = "leap-backend.conf"
+
+    # keys
+    GATEWAY_KEY = "Gateway"
+
+    def __init__(self):
+        """
+        Create the ConfigParser object and read it.
+        """
+        self._settings_path = os.path.join(get_path_prefix(),
+                                           "leap", self.CONFIG_NAME)
+
+        self._settings = ConfigParser.ConfigParser()
+        self._settings.read(self._settings_path)
+
+        self._add_section(GENERAL_SECTION)
+
+    def _add_section(self, section):
+        """
+        Add `section` to the config file and don't fail if already exists.
+
+        :param section: the section to add.
+        :type section: str
+        """
+        self._settings.read(self._settings_path)
+        try:
+            self._settings.add_section(section)
+        except ConfigParser.DuplicateSectionError:
+            pass
+
+    def _save(self):
+        """
+        Save the current state to the config file.
+        """
+        with open(self._settings_path, 'wb') as f:
+            self._settings.write(f)
+
+    def _get_value(self, section, key, default):
+        """
+        Return the value for the fiven `key` in `section`.
+        If there's no such section/key, `default` is returned.
+
+        :param section: the section to get the value from.
+        :type section: str
+        :param key: the key which value we want to get.
+        :type key: str
+        :param default: the value to return if there is no section/key.
+        :type default: object
+
+        :rtype: object
+        """
+        try:
+            return self._settings.get(section, key)
+        except (ConfigParser.NoOptionError, ConfigParser.NoSectionError):
+            return default
+
+    def get_selected_gateway(self, provider):
+        """
+        Return the configured gateway for the given `provider`.
+
+        :param provider: provider domain
+        :type provider: str
+
+        :rtype: str
+        """
+        leap_assert(len(provider) > 0, "We need a nonempty provider")
+        return self._get_value(provider, self.GATEWAY_KEY, GATEWAY_AUTOMATIC)
+
+    def set_selected_gateway(self, provider, gateway):
+        """
+        Saves the configured gateway for the given provider
+
+        :param provider: provider domain
+        :type provider: str
+
+        :param gateway: gateway to use as default
+        :type gateway: str
+        """
+
+        leap_assert(len(provider) > 0, "We need a nonempty provider")
+        leap_assert_type(gateway, (str, unicode))
+
+        self._add_section(provider)
+
+        self._settings.set(provider, self.GATEWAY_KEY, gateway)
+        self._save()
+
+    def get_uuid(self, username):
+        """
+        Gets the uuid for a given username.
+
+        :param username: the full user identifier in the form user@provider
+        :type username: basestring
+        """
+        leap_assert("@" in username,
+                    "Expected username in the form user@provider")
+        user, provider = username.split('@')
+
+        return self._get_value(provider, username, "")
+
+    def set_uuid(self, username, value):
+        """
+        Sets the uuid for a given username.
+
+        :param username: the full user identifier in the form user@provider
+        :type username: str or unicode
+        :param value: the uuid to save or None to remove it
+        :type value: str or unicode or None
+        """
+        leap_assert("@" in username,
+                    "Expected username in the form user@provider")
+        user, provider = username.split('@')
+
+        if value is None:
+            self._settings.remove_option(provider, username)
+        else:
+            leap_assert(len(value) > 0, "We cannot save an empty uuid")
+            self._add_section(provider)
+            self._settings.set(provider, username, value)
+
+        self._save()
diff --git a/src/leap/bitmask/backend/signaler.py b/src/leap/bitmask/backend/signaler.py
new file mode 100644
index 00000000..574bfa71
--- /dev/null
+++ b/src/leap/bitmask/backend/signaler.py
@@ -0,0 +1,177 @@
+# -*- coding: utf-8 -*-
+# signaler.py
+# Copyright (C) 2013, 2014 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+Signaler client.
+Receives signals from the backend and sends to the signaling server.
+"""
+import Queue
+import threading
+import time
+
+import zmq
+
+from leap.bitmask.backend.api import SIGNALS
+from leap.bitmask.backend.utils import get_frontend_certificates
+
+import logging
+logger = logging.getLogger(__name__)
+
+
+class Signaler(object):
+    """
+    Signaler client.
+    Receives signals from the backend and sends to the signaling server.
+    """
+    PORT = "5667"
+    SERVER = "tcp://localhost:%s" % PORT
+    POLL_TIMEOUT = 2000  # ms
+    POLL_TRIES = 500
+
+    def __init__(self):
+        """
+        Initialize the ZMQ socket to talk to the signaling server.
+        """
+        context = zmq.Context()
+        logger.debug("Connecting to signaling server...")
+        socket = context.socket(zmq.REQ)
+
+        # public, secret = zmq.curve_keypair()
+        client_keys = zmq.curve_keypair()
+        socket.curve_publickey = client_keys[0]
+        socket.curve_secretkey = client_keys[1]
+
+        # The client must know the server's public key to make a CURVE
+        # connection.
+        public, _ = get_frontend_certificates()
+        socket.curve_serverkey = public
+
+        socket.setsockopt(zmq.RCVTIMEO, 1000)
+        socket.connect(self.SERVER)
+        self._socket = socket
+
+        self._signal_queue = Queue.Queue()
+
+        self._do_work = threading.Event()  # used to stop the worker thread.
+        self._worker_signaler = threading.Thread(target=self._worker)
+
+    def __getattribute__(self, name):
+        """
+        This allows the user to do:
+            S = Signaler()
+            S.SOME_SIGNAL
+
+        Just by having defined 'some_signal' in _SIGNALS
+
+        :param name: the attribute name that is requested.
+        :type name: str
+        """
+        if name in SIGNALS:
+            return name
+        else:
+            return object.__getattribute__(self, name)
+
+    def signal(self, signal, data=None):
+        """
+        Sends a signal to the signaling server.
+
+        :param signal: the signal to send.
+        :type signal: str
+        """
+        if signal not in SIGNALS:
+            raise Exception("Unknown signal: '{0}'".format(signal))
+
+        request = {
+            'signal': signal,
+            'data': data,
+        }
+
+        try:
+            request_json = zmq.utils.jsonapi.dumps(request)
+        except Exception as e:
+            msg = ("Error serializing request into JSON.\n"
+                   "Exception: {0} Data: {1}")
+            msg = msg.format(e, request)
+            logger.critical(msg)
+            raise
+
+        # queue the call in order to handle the request in a thread safe way.
+        self._signal_queue.put(request_json)
+
+    def _worker(self):
+        """
+        Worker loop that processes the Queue of pending requests to do.
+        """
+        while self._do_work.is_set():
+            try:
+                request = self._signal_queue.get(block=False)
+                self._send_request(request)
+            except Queue.Empty:
+                pass
+            time.sleep(0.01)
+
+        logger.debug("Signaler thread stopped.")
+
+    def start(self):
+        """
+        Start the Signaler worker.
+        """
+        self._do_work.set()
+        self._worker_signaler.start()
+
+    def stop(self):
+        """
+        Stop the Signaler worker.
+        """
+        self._do_work.clear()
+
+    def _send_request(self, request):
+        """
+        Send the given request to the server.
+        This is used from a thread safe loop in order to avoid sending a
+        request without receiving a response from a previous one.
+
+        :param request: the request to send.
+        :type request: str
+        """
+        # logger.debug("Signaling '{0}'".format(request))
+        self._socket.send(request)
+
+        poll = zmq.Poller()
+        poll.register(self._socket, zmq.POLLIN)
+
+        reply = None
+        tries = 0
+
+        while True:
+            socks = dict(poll.poll(self.POLL_TIMEOUT))
+            if socks.get(self._socket) == zmq.POLLIN:
+                reply = self._socket.recv()
+                break
+
+            tries += 1
+            if tries < self.POLL_TRIES:
+                logger.warning('Retrying receive... {0}/{1}'.format(
+                    tries, self.POLL_TRIES))
+            else:
+                break
+
+        if reply is None:
+            msg = "Timeout error contacting backend."
+            logger.critical(msg)
+        # else:
+        #     msg = "Received reply for '{0}' -> '{1}'".format(request, reply)
+        #     logger.debug(msg)
diff --git a/src/leap/bitmask/backend/signaler_qt.py b/src/leap/bitmask/backend/signaler_qt.py
new file mode 100644
index 00000000..433f18ed
--- /dev/null
+++ b/src/leap/bitmask/backend/signaler_qt.py
@@ -0,0 +1,136 @@
+# -*- coding: utf-8 -*-
+# signaler_qt.py
+# Copyright (C) 2013, 2014 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+Signaling server.
+Receives signals from the signaling client and emit Qt signals for the GUI.
+"""
+import threading
+import time
+
+from PySide import QtCore
+
+import zmq
+from zmq.auth.thread import ThreadAuthenticator
+
+from leap.bitmask.backend.api import SIGNALS
+from leap.bitmask.backend.utils import get_frontend_certificates
+
+import logging
+logger = logging.getLogger(__name__)
+
+
+class SignalerQt(QtCore.QObject):
+    """
+    Signaling server.
+    Receives signals from the signaling client and emit Qt signals for the GUI.
+    """
+    PORT = "5667"
+    BIND_ADDR = "tcp://127.0.0.1:%s" % PORT
+
+    def __init__(self):
+        QtCore.QObject.__init__(self)
+
+        # Note: we use a plain thread instead of a QThread since works better.
+        # The signaler was not responding on OSX if the worker loop was run in
+        # a QThread.
+        # Possibly, ZMQ was not getting cycles to do work because Qt not
+        # receiving focus or something.
+        self._worker_thread = threading.Thread(target=self._run)
+        self._do_work = threading.Event()
+
+    def start(self):
+        """
+        Start the worker thread for the signaler server.
+        """
+        self._do_work.set()
+        self._worker_thread.start()
+
+    def _run(self):
+        """
+        Start a loop to process the ZMQ requests from the signaler client.
+        """
+        logger.debug("Running SignalerQt loop")
+        context = zmq.Context()
+        socket = context.socket(zmq.REP)
+
+        # Start an authenticator for this context.
+        auth = ThreadAuthenticator(context)
+        auth.start()
+        auth.allow('127.0.0.1')
+
+        # Tell authenticator to use the certificate in a directory
+        auth.configure_curve(domain='*', location=zmq.auth.CURVE_ALLOW_ANY)
+        public, secret = get_frontend_certificates()
+        socket.curve_publickey = public
+        socket.curve_secretkey = secret
+        socket.curve_server = True  # must come before bind
+
+        socket.bind(self.BIND_ADDR)
+
+        while self._do_work.is_set():
+            # Wait for next request from client
+            try:
+                request = socket.recv(zmq.NOBLOCK)
+                # logger.debug("Received request: '{0}'".format(request))
+                socket.send("OK")
+                self._process_request(request)
+            except zmq.ZMQError as e:
+                if e.errno != zmq.EAGAIN:
+                    raise
+            time.sleep(0.01)
+
+        logger.debug("SignalerQt thread stopped.")
+
+    def stop(self):
+        """
+        Stop the SignalerQt blocking loop.
+        """
+        self._do_work.clear()
+
+    def _process_request(self, request_json):
+        """
+        Process a request and call the according method with the given
+        parameters.
+
+        :param request_json: a json specification of a request.
+        :type request_json: str
+        """
+        try:
+            request = zmq.utils.jsonapi.loads(request_json)
+            signal = request['signal']
+            data = request['data']
+        except Exception as e:
+            msg = "Malformed JSON data in Signaler request '{0}'. Exc: {1!r}"
+            msg = msg.format(request_json, e)
+            logger.critical(msg)
+            raise
+
+        if signal not in SIGNALS:
+            logger.error("Unknown signal received, '{0}'".format(signal))
+            return
+
+        try:
+            qt_signal = getattr(self, signal)
+        except Exception:
+            logger.warning("Signal not implemented, '{0}'".format(signal))
+            return
+
+        # logger.debug("Emitting '{0}'".format(signal))
+        if data is None:
+            qt_signal.emit()
+        else:
+            qt_signal.emit(data)
diff --git a/src/leap/bitmask/backend/utils.py b/src/leap/bitmask/backend/utils.py
new file mode 100644
index 00000000..54a16fd7
--- /dev/null
+++ b/src/leap/bitmask/backend/utils.py
@@ -0,0 +1,61 @@
+# -*- coding: utf-8 -*-
+# utils.py
+# Copyright (C) 2013, 2014 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+Backend utilities to handle ZMQ certificates.
+"""
+import os
+import shutil
+
+import zmq.auth
+
+from leap.bitmask.util import get_path_prefix
+from leap.common.files import mkdir_p
+
+KEYS_DIR = os.path.join(get_path_prefix(), 'leap', 'zmq_certificates')
+
+
+def generate_certificates():
+    """
+    Generate client and server CURVE certificate files.
+    """
+    # Create directory for certificates, remove old content if necessary
+    if os.path.exists(KEYS_DIR):
+        shutil.rmtree(KEYS_DIR)
+    mkdir_p(KEYS_DIR)
+
+    # create new keys in certificates dir
+    # public_file, secret_file = create_certificates(...)
+    zmq.auth.create_certificates(KEYS_DIR, "frontend")
+    zmq.auth.create_certificates(KEYS_DIR, "backend")
+
+
+def get_frontend_certificates():
+    """
+    Return the frontend's public and secret certificates.
+    """
+    frontend_secret_file = os.path.join(KEYS_DIR, "frontend.key_secret")
+    public, secret = zmq.auth.load_certificate(frontend_secret_file)
+    return public, secret
+
+
+def get_backend_certificates(base_dir='.'):
+    """
+    Return the backend's public and secret certificates.
+    """
+    backend_secret_file = os.path.join(KEYS_DIR, "backend.key_secret")
+    public, secret = zmq.auth.load_certificate(backend_secret_file)
+    return public, secret