[feature] reactor-based authenticator

We don't really need a thread to make use of the ZAP authenticator.
Document bug fix after authenticator thread is gone

1 files changed, 96 insertions, 0 deletions

diff --git a/src/leap/common/events/auth.py b/src/leap/common/events/auth.py
new file mode 100644
index 0000000..1a1bcab
--- /dev/null
+++ b/src/leap/common/events/auth.py
@@ -0,0 +1,96 @@
+# -*- coding: utf-8 -*-
+# auth.py
+# Copyright (C) 2016 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/>.
+"""
+ZAP authentication, twisted style.
+"""
+from zmq import PAIR
+from zmq.auth.base import Authenticator, VERSION
+from txzmq.connection import ZmqConnection
+from zmq.utils.strtypes import b, u
+
+from twisted.python import log
+
+from txzmq.connection import ZmqEndpoint, ZmqEndpointType
+
+
+class TxAuthenticator(ZmqConnection):
+
+    """
+    This does not implement the whole ZAP protocol, but the bare minimum that
+    we need.
+    """
+
+    socketType = PAIR
+    address = 'inproc://zeromq.zap.01'
+    encoding = 'utf-8'
+
+    def __init__(self, factory):
+        super(TxAuthenticator, self).__init__(factory)
+        self.authenticator = Authenticator(factory.context)
+        self.authenticator._send_zap_reply = self._send_zap_reply
+
+    def start(self):
+        endpoint = ZmqEndpoint(ZmqEndpointType.bind, self.address)
+        self.addEndpoints([endpoint])
+
+    def messageReceived(self, msg):
+
+        command = msg[0]
+
+        if command == b'ALLOW':
+            addresses = [u(m, self.encoding) for m in msg[1:]]
+            try:
+                self.authenticator.allow(*addresses)
+            except Exception as e:
+                log.err("Failed to allow %s", addresses)
+
+        elif command == b'CURVE':
+            domain = u(msg[1], self.encoding)
+            location = u(msg[2], self.encoding)
+            self.authenticator.configure_curve(domain, location)
+
+    def _send_zap_reply(self, request_id, status_code, status_text,
+                        user_id='user'):
+        """
+        Send a ZAP reply to finish the authentication.
+        """
+        user_id = user_id if status_code == b'200' else b''
+        if isinstance(user_id, unicode):
+            user_id = user_id.encode(self.encoding, 'replace')
+        metadata = b''  # not currently used
+        reply = [VERSION, request_id, status_code, status_text,
+                 user_id, metadata]
+        self.send(reply)
+
+
+class TxAuthenticationRequest(ZmqConnection):
+
+    socketType = PAIR
+    address = 'inproc://zeromq.zap.01'
+    encoding = 'utf-8'
+
+    def start(self):
+        endpoint = ZmqEndpoint(ZmqEndpointType.connect, self.address)
+        self.addEndpoints([endpoint])
+
+    def allow(self, *addresses):
+        self.send([b'ALLOW'] + [b(a, self.encoding) for a in addresses])
+
+    def configure_curve(self, domain='*', location=''):
+        domain = b(domain, self.encoding)
+        location = b(location, self.encoding)
+        self.send([b'CURVE', domain, location])