From ea41bb44afee34e8ad6baf917ba461a7e95bf70d Mon Sep 17 00:00:00 2001
From: Kali Kaneko <kali@leap.se>
Date: Wed, 16 Dec 2015 01:12:30 -0400
Subject: [feat] cred authentication for SMTP service

---
 src/leap/mail/cred.py | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 src/leap/mail/cred.py

(limited to 'src/leap/mail/cred.py')

diff --git a/src/leap/mail/cred.py b/src/leap/mail/cred.py
new file mode 100644
index 0000000..7eab1f0
--- /dev/null
+++ b/src/leap/mail/cred.py
@@ -0,0 +1,80 @@
+# -*- coding: utf-8 -*-
+# cred.py
+# Copyright (C) 2015 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/>.
+"""
+Credentials handling.
+"""
+
+from zope.interface import implementer
+from twisted.cred.checkers import ICredentialsChecker
+from twisted.cred.credentials import IUsernamePassword
+from twisted.cred.error import UnauthorizedLogin
+from twisted.internet import defer
+
+
+@implementer(ICredentialsChecker)
+class LocalSoledadTokenChecker(object):
+
+    """
+    A Credentials Checker for a LocalSoledad store.
+
+    It checks that:
+
+    1) The Local SoledadStorage has been correctly unlocked for the given
+       user. This currently means that the right passphrase has been passed
+       to the Local SoledadStorage.
+
+    2) The password passed in the credentials matches whatever token has
+       been stored in the local encrypted SoledadStorage, associated to the
+       Protocol that is requesting the authentication.
+    """
+
+    credentialInterfaces = (IUsernamePassword,)
+    service = None
+
+    def __init__(self, soledad_sessions):
+        """
+        :param soledad_sessions: a dict-like object, containing instances
+                                 of a Store (soledad instances), indexed by
+                                 userid.
+        """
+        self._soledad_sessions = soledad_sessions
+
+    def requestAvatarId(self, credentials):
+        if self.service is None:
+            raise NotImplementedError(
+                "this checker has not defined its service name")
+        username, password = credentials.username, credentials.password
+        d = self.checkSoledadToken(username, password, self.service)
+        d.addErrback(lambda f: defer.fail(UnauthorizedLogin()))
+        return d
+
+    def checkSoledadToken(self, username, password, service):
+        soledad = self._soledad_sessions.get(username)
+        if not soledad:
+            return defer.fail(Exception("No soledad"))
+
+        def match_token(token):
+            if token is None:
+                raise RuntimeError('no token')
+            if token == password:
+                return username
+            else:
+                raise RuntimeError('bad token')
+
+        d = soledad.get_or_create_service_token(service)
+        d.addCallback(match_token)
+        return d
-- 
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