1 files changed, 85 insertions, 0 deletions
diff --git a/service/src/pixelated/authentication.py b/service/src/pixelated/authentication.py
new file mode 100644
index 00000000..b5edbec0
--- /dev/null
+++ b/service/src/pixelated/authentication.py
@@ -0,0 +1,85 @@
+#
+# Copyright (c) 2014 ThoughtWorks, Inc.
+#
+# Pixelated is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Pixelated 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with Pixelated. If not, see <http://www.gnu.org/licenses/>.
+import re
+from collections import namedtuple
+
+from leap.bitmask.bonafide.provider import Api
+from leap.bitmask.bonafide.session import Session
+from leap.bitmask.bonafide._srp import SRPAuthError
+
+from twisted.cred.error import UnauthorizedLogin
+from twisted.internet.defer import inlineCallbacks, returnValue
+
+Credentials = namedtuple('Credentials', 'username, password')
+
+
+class Authenticator(object):
+    def __init__(self, leap_provider):
+        self._leap_provider = leap_provider
+        self.domain = leap_provider.server_name
+        self.bonafide_session = None
+
+    @inlineCallbacks
+    def authenticate(self, username, password):
+        username = self.clean_username(username)
+        auth = yield self._srp_auth(username, password)
+        returnValue(auth)
+
+    @inlineCallbacks
+    def _srp_auth(self, username, password):
+        try:
+            auth = yield self._bonafide_auth(username, password)
+        except SRPAuthError:
+            raise UnauthorizedLogin("User typed wrong password/username combination.")
+        returnValue(auth)
+
+    @inlineCallbacks
+    def _bonafide_auth(self, user, password):
+        srp_provider = Api(self._leap_provider.api_uri)
+        credentials = Credentials(user, password)
+        self.bonafide_session = Session(credentials, srp_provider, self._leap_provider.local_ca_crt)
+        yield self.bonafide_session.authenticate()
+        returnValue(Authentication(user,
+                                   self.bonafide_session.token,
+                                   self.bonafide_session.uuid,
+                                   'session_id',
+                                   {'is_admin': False}))
+
+    def clean_username(self, username):
+        if '@' not in username:
+            return username
+        extracted_username = self.extract_username(username)
+        if self.username_with_domain(extracted_username) == username:
+            return extracted_username
+        raise UnauthorizedLogin('User typed a wrong domain.')
+
+    def extract_username(self, username):
+        return re.search('^([^@]+)@?.*$', username).group(1)
+
+    def username_with_domain(self, username):
+        return '%s@%s' % (username, self.domain)
+
+
+class Authentication(object):
+    def __init__(self, username, token, uuid, session_id, user_attributes):
+        self.username = username
+        self.token = token
+        self.uuid = uuid
+        self.session_id = session_id
+        self._user_attributes = user_attributes
+
+    def is_admin(self):
+        return self._user_attributes.get('is_admin', False)