Update README

README.rst

-=====
 CAS Server
-=====
+==========
+
+.. image:: https://badge.fury.io/py/django-cas-server.svg
+    :target: https://badge.fury.io/py/django-cas-server
+
+.. image:: https://travis-ci.org/nitmir/django-cas-server.svg?branch=master
+    :target: https://travis-ci.org/nitmir/django-cas-server
 
 CAS Server is a Django app implementing the `CAS Protocol 3.0 Specification
 <https://jasig.github.io/cas/development/protocol/CAS-Protocol-Specification.html>`_.
@@ -13,7 +18,7 @@ are listed in default_settings.py
 
 The defaut login/logout template use `django-bootstrap3 <https://github.com/dyve/django-bootstrap3>`_
 but you can use your own templates using the CAS_LOGIN_TEMPLATE,
-CAS_LOGGED_TEMPLATE, CAS_WARN_TEMPLATE and CAS_LOGOUT_TEMPLATEsetting variables.
+CAS_LOGGED_TEMPLATE, CAS_WARN_TEMPLATE and CAS_LOGOUT_TEMPLATE setting variables.
 
 Quick start
 -----------
@@ -46,3 +51,99 @@ Quick start
    (you'll need the Admin app enabled).
 
 5. Visit http://127.0.0.1:8000/cas/ to login with your django users.
+
+Settings
+--------
+
+All settings are optional. Add them to ``settings.py`` to customize ``django-cas-server``:
+
+
+Template settings:
+
+ * ``CAS_LOGIN_TEMPLATE``: Path to the template showed on ``/login`` then the user
+   is not autenticated.  The default is ``"cas_server/login.html"``.
+ * ``CAS_WARN_TEMPLATE``: Path to the template showed on ``/login?service=…`` then
+   the user is authenticated and has asked to be warned before beeing connected
+   to a service. The default is ``"cas_server/warn.html"``.
+ * ``CAS_LOGGED_TEMPLATE``: Path to the template showed on ``/login`` then to user is
+   authenticated. The default is ``"cas_server/logged.html"``.
+ * ``CAS_LOGOUT_TEMPLATE``: Path to the template showed on ``/logout`` then to user
+   is being disconnected. The default is ``"cas_server/logout.html"``
+ * ``CAS_REDIRECT_TO_LOGIN_AFTER_LOGOUT``: Should we redirect users to `/login` after they
+   logged out instead of displaying ``CAS_LOGOUT_TEMPLATE``. The default is ``False``.
+
+
+Authentication settings:
+
+ *  ``CAS_AUTH_CLASS``: A dotted paths to a class implementing ``cas_server.auth.AuthUser``.
+    The default is ``"cas_server.auth.DjangoAuthUser"``
+
+ * ``CAS_PROXY_CA_CERTIFICATE_PATH``: Path to certificates authority file. Usually on linux
+   the local CAs are in ``/etc/ssl/certs/ca-certificates.crt``. The default is ``True`` which
+   tell requests to use its internal certificat authorities. Settings it to ``False`` should
+   disable all x509 certificates validation and MUST not be done in production.
+   x509 certificate validation is perform upon PGT issuance.
+
+ * ``CAS_SLO_MAX_PARALLEL_REQUESTS``: Maximum number of parallel single log out requests send.
+   If more requests need to be send, there are queued. The default is ``10``.
+
+Tickets validity settings:
+
+ * ``CAS_TICKET_VALIDITY``: Number of seconds the service tickets and proxy tickets are valid.
+   This is the maximal time between ticket issuance by the CAS and ticket validation by an
+   application. The default is ``60``.
+ * ``CAS_PGT_VALIDITY``: Number of seconds the proxy granting tickets are valid.
+   The default is ``3600`` (1 hour).
+ * ``CAS_TICKET_TIMEOUT``: Number of seconds a ticket is kept is the database before sending
+   Single Log Out request and being cleared. The default is ``86400`` (24 hours).
+
+Tickets miscellaneous settings:
+
+ * ``CAS_TICKET_LEN``: Default ticket length. All CAS implementation MUST support ST and PT
+   up to 32 chars, PGT and PGTIOU up to 64 chars and it is RECOMMENDED that all tickets up
+   to 256 chars are supports. Here the default is ``64``.
+ * ``CAS_LT_LEN``: Length of the login tickets. Login tickets are only processed by ``django-cas-server``
+   thus there is no length restriction on it. The default is ``CAS_TICKET_LEN``.
+ * ``CAS_ST_LEN``: Length of the service tickets. The default is ``CAS_TICKET_LEN``.
+   You may need to lower is to ``32`` if you use some old clients.
+ * ``CAS_PT_LEN``: Length of the proxy tickets. The default is ``CAS_TICKET_LEN``.
+   This length should be the same as ``CAS_ST_LEN``. You may need to lower is to ``32``
+   if you use some old clients.
+ * ``CAS_PGT_LEN``: Length of the proxy granting tickets. The default is ``CAS_TICKET_LEN``.
+ * ``CAS_PGTIOU_LEN``: Length of the proxy granting tickets IOU. The default is ``CAS_TICKET_LEN``.
+
+ * ``CAS_LOGIN_TICKET_PREFIX``: Prefix of login tickets. The default is ``"LT"``.
+ * ``CAS_SERVICE_TICKET_PREFIX``: Prefix of service tickets. The default is ``"ST"``.
+   The CAS specification mandate that service tickets MUST begin with the characters ST
+   so you should not change this.
+ * ``CAS_PROXY_TICKET_PREFIX``: Prefix of proxy ticket. The default is ``"ST"``.
+ * ``CAS_PROXY_GRANTING_TICKET_PREFIX``: Prefix of proxy granting ticket. The default is ``"PGT"``.
+ * ``CAS_PROXY_GRANTING_TICKET_IOU_PREFIX``: Prefix of proxy granting ticket IOU. The default is ``"PGTIOU"``.
+
+
+Mysql backend settings. Only usefull is you use the mysql authentication backend:
+
+ * ``CAS_SQL_HOST``: Host for the SQL server. The default is ``"localhost"``.
+ * ``CAS_SQL_USERNAME``: Username for connecting to the SQL server.
+ * ``CAS_SQL_PASSWORD``: Password for connecting to the SQL server.
+ * ``CAS_SQL_DBNAME``: Database name.
+ * ``CAS_SQL_DBCHARSET``: Database charset. The default is ``"utf8"``
+ * ``CAS_SQL_USER_QUERY``: The query performed upon user authentication.
+   The username must be in field ``username``, the password in ``password``,
+   additional fields are used as the user attributs.
+   The default is ``"SELECT user AS usersame, pass AS password, users.* FROM users WHERE user = %s"``
+ * ``CAS_SQL_PASSWORD_CHECK``: The method used to check the user password. Must be
+   ``"crypt"`` or ``"plain``". The default is ``"crypt"``.
+
+Authentication backend
+----------------------
+
+``django-cas-server`` comes with some authentication backends:
+
+ * dummy backend ``cas_server.auth.DummyAuthUser``: all authentication attempt fails.
+ * test backend ``cas_server.auth.TestAuthUser``: username is ``test`` and password is ``test``
+   the returned attributs for the user are: ``{'nom': 'Nymous', 'prenom': 'Ano', 'email': 'anonymous@example.net'}``
+ * django backend ``cas_server.auth.DjangoAuthUser``: Users are anthenticated agains django users system.
+   This is the default backend. The returned attributs are the fields available on the user model.
+ * mysql backend ``cas_server.auth.MysqlAuthUser``: see the 'Mysql backend settings' section.
+   The returned attributs are those return by sql query ``CAS_SQL_USER_QUERY``.

cas_server/auth.py

@@ -11,7 +11,7 @@
 # (c) 2015 Valentin Samir
 """Some authentication classes for the CAS"""
 from django.conf import settings
-from django.contrib.auth.models import User
+from django.contrib.auth import get_user_model
 try:
     import MySQLdb
     import MySQLdb.cursors
@@ -20,11 +20,24 @@ except ImportError:
     MySQLdb = None
 
 
-class DummyAuthUser(object):
+class AuthUser(object):
+    def __init__(self, username):
+        self.username = username
+
+    def test_password(self, password):
+        """test `password` agains the user"""
+        raise NotImplemented()
+
+    def attributs(self):
+        """return a dict of user attributes"""
+        raise NotImplemented()
+
+
+class DummyAuthUser(AuthUser):
     """A Dummy authentication class"""
 
     def __init__(self, username):
-        self.username = username
+        super(DummyAuthUser, self).__init__(username)
 
     def test_password(self, password):
         """test `password` agains the user"""
@@ -35,7 +48,7 @@ class DummyAuthUser(object):
         return {}
 
 
-class TestAuthUser(DummyAuthUser):
+class TestAuthUser(AuthUser):
     """A test authentication class with one user test having
     alose test as password and some attributes"""
 
@@ -51,7 +64,7 @@ class TestAuthUser(DummyAuthUser):
         return {'nom': 'Nymous', 'prenom': 'Ano', 'email': 'anonymous@example.net'}
 
 
-class MysqlAuthUser(DummyAuthUser):
+class MysqlAuthUser(AuthUser):
     """A mysql auth class: authentication user agains a mysql database"""
     user = None
 
@@ -97,11 +110,12 @@ class MysqlAuthUser(DummyAuthUser):
             return self.user
 
 
-class DjangoAuthUser(DummyAuthUser):
+class DjangoAuthUser(AuthUser):
     """A django auth class: authenticate user agains django internal users"""
     user = None
 
     def __init__(self, username):
+        User = get_user_model()
         try:
             self.user = User.objects.get(username=username)
         except User.DoesNotExist: