initial commit

.gitignore

@@ -0,0 +1,6 @@
+*.pyc
+
+bootstrap3
+cas/
+db.sqlite3
+manage.py

cas_server/__init__.py

@@ -0,0 +1 @@
+import default_settings

cas_server/admin.py

@@ -0,0 +1,28 @@
+from django.contrib import admin
+from models import *
+from forms import *
+# Register your models here.
+
+class ServiceTicketInline(admin.TabularInline):
+    model = ServiceTicket
+    extra = 0
+    form = TicketForm
+class ProxyTicketInline(admin.TabularInline):
+    model = ProxyTicket
+    extra = 0
+    form = TicketForm
+class ProxyGrantingInline(admin.TabularInline):
+    model = ProxyGrantingTicket
+    extra = 0
+    form = TicketForm
+
+class UserAdmin(admin.ModelAdmin):
+    inlines = (ServiceTicketInline, ProxyTicketInline, ProxyGrantingInline)
+
+class ServicePatternAdmin(admin.ModelAdmin):
+    list_display = ('pos', 'pattern', 'proxy')
+
+
+admin.site.register(User, UserAdmin)
+admin.site.register(ServicePattern, ServicePatternAdmin)
+#admin.site.register(ProxyGrantingTicketIOU, admin.ModelAdmin)

cas_server/default_settings.py

@@ -0,0 +1,24 @@
+from django.conf import settings
+
+def setting_default(name, default_value):
+    value = getattr(settings, name, default_value)
+    setattr(settings, name, value)
+
+class AuthUser(object):
+    def __init__(self, username):
+        self.username = username
+
+    def test_password(self, password):
+        return self.username == "test" and password == "test"
+
+    def attributs(self):
+        return {'nom':'Nymous', 'prenom':'Ano', 'email':'anonymous@example.net'}
+
+
+setting_default('CAS_LOGIN_TEMPLATE', 'cas_server/login.html')
+setting_default('CAS_WARN_TEMPLATE', 'cas_server/warn.html')
+setting_default('CAS_LOGGED_TEMPLATE', 'cas_server/logged.html')
+setting_default('CAS_AUTH_CLASS', AuthUser)
+setting_default('CAS_ST_LEN', 30)
+setting_default('CAS_TICKET_VALIDITY', 300)
+setting_default('CAS_PROXY_CA_CERTIFICATE_PATH', True)

cas_server/forms.py

@@ -0,0 +1,36 @@
+from django import forms
+from django.conf import settings
+
+import models
+
+class UserCredential(forms.Form):
+    username = forms.CharField(label='login')
+    service = forms.CharField(widget=forms.HiddenInput(), required=False)
+    password = forms.CharField(label='password', widget=forms.PasswordInput)
+    method = forms.CharField(widget=forms.HiddenInput(), required=False)
+    warn = forms.BooleanField(label='warn', required=False)
+
+    def __init__(self, *args, **kwargs):
+        super(UserCredential, self).__init__(*args, **kwargs)
+
+    def clean(self):
+        cleaned_data = super(UserCredential, self).clean()
+        auth = settings.CAS_AUTH_CLASS(cleaned_data.get("username"))
+        if auth.test_password(cleaned_data.get("password")):
+            try:
+                user = models.User.objects.get(username=auth.username)
+                user.attributs=auth.attributs()
+                user.save()
+            except models.User.DoesNotExist:
+                user = models.User.objects.create(username=auth.username, attributs=auth.attributs())
+                user.save()
+            self.user = user
+        else:
+            raise forms.ValidationError("Bad user")
+
+
+class TicketForm(forms.ModelForm):
+    class Meta:
+        model = models.Ticket
+        exclude = []
+    service = forms.CharField(widget=forms.TextInput)

cas_server/migrations/0001_initial.py

@@ -0,0 +1,127 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+import cas_server.models
+import picklefield.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Proxy',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+                ('url', models.CharField(max_length=255)),
+            ],
+            options={
+                'ordering': ('-pk',),
+            },
+            bases=(models.Model,),
+        ),
+        migrations.CreateModel(
+            name='ProxyGrantingTicket',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+                ('attributs', picklefield.fields.PickledObjectField(editable=False)),
+                ('validate', models.BooleanField(default=False)),
+                ('service', models.TextField()),
+                ('creation', models.DateTimeField(auto_now_add=True)),
+                ('renew', models.BooleanField(default=False)),
+                ('value', models.CharField(default=cas_server.models._gen_pgt, unique=True, max_length=255)),
+            ],
+            options={
+                'abstract': False,
+            },
+            bases=(models.Model,),
+        ),
+        migrations.CreateModel(
+            name='ProxyTicket',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+                ('attributs', picklefield.fields.PickledObjectField(editable=False)),
+                ('validate', models.BooleanField(default=False)),
+                ('service', models.TextField()),
+                ('creation', models.DateTimeField(auto_now_add=True)),
+                ('renew', models.BooleanField(default=False)),
+                ('value', models.CharField(default=cas_server.models._gen_pt, unique=True, max_length=255)),
+            ],
+            options={
+                'abstract': False,
+            },
+            bases=(models.Model,),
+        ),
+        migrations.CreateModel(
+            name='ServicePattern',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+                ('pos', models.IntegerField(default=100)),
+                ('pattern', models.CharField(unique=True, max_length=255)),
+                ('user_field', models.CharField(default=b'', help_text=b"Nom de l'attribut transmit comme username, vide = login", max_length=255, blank=True)),
+                ('usernames', models.CharField(default=b'', help_text=b"Liste d'utilisateurs accept\xc3\xa9s s\xc3\xa9par\xc3\xa9 par des virgules, vide = tous les utilisateur", max_length=255, blank=True)),
+                ('attributs', models.CharField(default=b'', help_text=b"Liste des nom d'attributs \xc3\xa0 transmettre au service, s\xc3\xa9par\xc3\xa9 par une virgule. vide = aucun", max_length=255, blank=True)),
+                ('proxy', models.BooleanField(default=False, help_text=b"Un ProxyGrantingTicket peut \xc3\xaatre d\xc3\xa9livr\xc3\xa9 au service pour s'authentifier en temps que l'utilisateur sur d'autres services")),
+                ('filter', models.CharField(default=b'', help_text=b'Une lambda fonction pour filtrer sur les utilisateur o\xc3\xb9 leurs attribut, arg1: username, arg2:attrs_dict. vide = pas de filtre', max_length=255, blank=True)),
+            ],
+            options={
+                'ordering': ('pos',),
+            },
+            bases=(models.Model,),
+        ),
+        migrations.CreateModel(
+            name='ServiceTicket',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+                ('attributs', picklefield.fields.PickledObjectField(editable=False)),
+                ('validate', models.BooleanField(default=False)),
+                ('service', models.TextField()),
+                ('creation', models.DateTimeField(auto_now_add=True)),
+                ('renew', models.BooleanField(default=False)),
+                ('value', models.CharField(default=cas_server.models._gen_st, unique=True, max_length=255)),
+            ],
+            options={
+                'abstract': False,
+            },
+            bases=(models.Model,),
+        ),
+        migrations.CreateModel(
+            name='User',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+                ('username', models.CharField(unique=True, max_length=30)),
+                ('attributs', picklefield.fields.PickledObjectField(editable=False)),
+                ('date', models.DateTimeField(auto_now=True, auto_now_add=True)),
+            ],
+            options={
+            },
+            bases=(models.Model,),
+        ),
+        migrations.AddField(
+            model_name='serviceticket',
+            name='user',
+            field=models.ForeignKey(related_name='serviceticket', to='cas_server.User'),
+            preserve_default=True,
+        ),
+        migrations.AddField(
+            model_name='proxyticket',
+            name='user',
+            field=models.ForeignKey(related_name='proxyticket', to='cas_server.User'),
+            preserve_default=True,
+        ),
+        migrations.AddField(
+            model_name='proxygrantingticket',
+            name='user',
+            field=models.ForeignKey(related_name='proxygrantingticket', to='cas_server.User'),
+            preserve_default=True,
+        ),
+        migrations.AddField(
+            model_name='proxy',
+            name='proxy_ticket',
+            field=models.ForeignKey(related_name='proxies', to='cas_server.ProxyTicket'),
+            preserve_default=True,
+        ),
+    ]

cas_server/models.py

@@ -0,0 +1,131 @@
+# ⁻*- coding: utf-8 -*-
+
+from django.conf import settings
+from django.db import models
+from django.contrib import messages
+from picklefield.fields import PickledObjectField
+
+import re
+import os
+import time
+import random
+import string
+import requests
+
+import utils
+def _gen_ticket(prefix):
+    return '%s-%s' % (prefix, ''.join(random.choice(string.ascii_letters + string.digits) for _ in range(settings.CAS_ST_LEN)))
+
+def _gen_st():
+    return _gen_ticket('ST')
+
+def _gen_pt():
+    return _gen_ticket('PT')
+
+def _gen_pgt():
+    return _gen_ticket('PGT')
+
+
+class User(models.Model):
+    username = models.CharField(max_length=30, unique=True)
+    attributs = PickledObjectField()
+    date = models.DateTimeField(auto_now_add=True, auto_now=True)
+
+    def __unicode__(self):
+        return self.username
+
+    def logout(self, request):
+        for ticket in ServiceTicket.objects.filter(user=self):
+            ticket.logout(request)
+            ticket.delete()
+        for ticket in ProxyTicket.objects.filter(user=self):
+            ticket.logout(request)
+            ticket.delete()
+        for ticket in ProxyGrantingTicket.objects.filter(user=self):
+            ticket.logout(request)
+            ticket.delete()
+
+    def delete(self):
+        super(User, self).delete()
+
+    def get_service_url(self, service, service_pattern, renew):
+        attributs = [s.strip() for s in service_pattern.attributs.split(',')]
+        ticket = ServiceTicket.objects.create(user=self, attributs = dict([(k, v) for (k, v) in self.attributs.items() if k in attributs]), service=service, renew=renew)
+        ticket.save()
+        url = utils.update_url(service, {'ticket':ticket.value})
+        return url
+
+class Ticket(models.Model):
+    class Meta:
+        abstract = True
+    user = models.ForeignKey(User, related_name="%(class)s")
+    attributs = PickledObjectField()
+    validate = models.BooleanField(default=False)
+    service = models.TextField()
+    creation = models.DateTimeField(auto_now_add=True)
+    renew = models.BooleanField(default=False)
+
+    def __unicode__(self):
+        return u"%s: %s %s" % (self.user, self.value, self.service)
+
+    def logout(self, request):
+        #if self.validate:
+            xml = """<samlp:LogoutRequest xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"
+     ID="%(id)s" Version="2.0" IssueInstant="%(datetime)s">
+    <saml:NameID xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"></saml:NameID>
+    <samlp:SessionIndex>%(ticket)s</samlp:SessionIndex>
+  </samlp:LogoutRequest>""" % {'id' : os.urandom(20).encode("hex"), 'datetime' : int(time.time()), 'ticket': self.value}
+            headers = {'Content-Type': 'text/xml'}
+            try:
+                requests.post(self.service.encode('utf-8'), data=xml.encode('utf-8'), headers=headers)
+            except Exception as e:
+                messages.add_message(request, messages.WARNING, u'Erreur lors de la déconnexion du service %s:\n%s' % (self.service, e))
+
+class ServiceTicket(Ticket):
+    value = models.CharField(max_length=255, default=_gen_st, unique=True)
+class ProxyTicket(Ticket):
+    value = models.CharField(max_length=255, default=_gen_pt, unique=True)
+class ProxyGrantingTicket(Ticket):
+    value = models.CharField(max_length=255, default=_gen_pgt, unique=True)
+#class ProxyGrantingTicketIOU(Ticket):
+#    value = models.CharField(max_length=255, default=lambda:_gen_ticket('PGTIOU'), unique=True)
+
+class Proxy(models.Model):
+    class Meta:
+        ordering = ("-pk", )
+    url = models.CharField(max_length=255)
+    proxy_ticket = models.ForeignKey(ProxyTicket, related_name="proxies")
+
+class BadUsername(Exception):
+    pass
+class BadFilter(Exception):
+    pass
+class ServicePattern(models.Model):
+    class Meta:
+        ordering = ("pos", )
+
+    pos = models.IntegerField(default=100)
+    pattern = models.CharField(max_length=255, unique=True)
+    user_field = models.CharField(max_length=255, default="", blank=True, help_text="Nom de l'attribut transmit comme username, vide = login")
+    usernames = models.CharField(max_length=255, default="", blank=True, help_text="Liste d'utilisateurs acceptés séparé par des virgules, vide = tous les utilisateur")
+    attributs = models.CharField(max_length=255, default="", blank=True, help_text="Liste des nom d'attributs à transmettre au service, séparé par une virgule. vide = aucun")
+    proxy = models.BooleanField(default=False,  help_text="Un ProxyGrantingTicket peut être délivré au service pour s'authentifier en temps que l'utilisateur sur d'autres services")
+    filter = models.CharField(max_length=255, default="", blank=True, help_text="Une lambda fonction pour filtrer sur les utilisateur où leurs attribut, arg1: username, arg2:attrs_dict. vide = pas de filtre")
+
+    def __unicode__(self):
+        return u"%s: %s" % (self.pos, self.pattern)
+
+    def check_user(self, user):
+        if self.usernames and not user.username in self.usernames.split(','):
+            raise BadUsername()
+        if self.filter and self.filter.startswith("lambda") and not eval(str(self.filter))(user.username, user.attributs):
+            raise BadFilter()
+        return True
+
+
+    @classmethod
+    def validate(cls, service):
+        for s in cls.objects.all():
+            if re.match(s.pattern, service):
+                return s
+        raise cls.DoesNotExist()

cas_server/static/cas_server/login.css

@@ -0,0 +1,42 @@
+body {
+  padding-top: 40px;
+  padding-bottom: 40px;
+  background-color: #eee;
+}
+
+/*.form-signin {
+  max-width: 330px;
+  padding: 15px;
+  margin: 0 auto;
+}
+*/
+.form-signin .form-signin-heading,
+.form-signin .checkbox {
+  margin-bottom: 10px;
+}
+.form-signin .checkbox {
+  font-weight: normal;
+}
+.form-signin .form-control {
+  position: relative;
+  height: auto;
+  -webkit-box-sizing: border-box;
+     -moz-box-sizing: border-box;
+          box-sizing: border-box;
+  padding: 10px;
+  font-size: 16px;
+}
+.form-signin .form-control:focus {
+  z-index: 2;
+}
+.form-signin input[type="text"] {
+  margin-bottom: -1px;
+  border-bottom-right-radius: 0;
+  border-bottom-left-radius: 0;
+}
+.form-signin input[type="password"] {
+  margin-bottom: 10px;
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+

cas_server/templates/cas_server/base.html

@@ -0,0 +1,6 @@
+{% extends 'bootstrap3/bootstrap3.html' %}
+{% block bootstrap3_title %}{% block title %}{% endblock %}{% endblock %}
+
+{% load url from future %}
+
+{% load bootstrap3 %}

cas_server/templates/cas_server/logged.html

@@ -0,0 +1,20 @@
+{% extends "cas_server/base.html" %}
+{% load bootstrap3 %}
+{% load staticfiles %}
+{% block bootstrap3_extra_head %}
+<link href="{% static "cas_server/login.css" %}" rel="stylesheet">
+{% endblock %}
+{% block bootstrap3_content %}
+<div class="container">
+<div class="row">
+<div class="col-md-3"></div>
+<div class="col-md-6">
+{% bootstrap_messages %}
+<div class="alert alert-success" role="alert">Logged</div>
+{% bootstrap_button 'Arrêter' size='lg' button_class="btn-danger btn-block" href="logout" %}
+</div>
+<div class="col-md-3"></div>
+</div>
+    </div> <!-- /container -->
+{% endblock %}
+

cas_server/templates/cas_server/login.html

@@ -0,0 +1,24 @@
+{% extends "cas_server/base.html" %}
+{% load bootstrap3 %}
+{% load staticfiles %}
+{% block bootstrap3_extra_head %}
+<link href="{% static "cas_server/login.css" %}" rel="stylesheet">
+{% endblock %}
+{% block bootstrap3_content %}
+<div class="container">
+<div class="row">
+<div class="col-md-3"></div>
+<div class="col-md-6">
+{% bootstrap_messages %}
+      <form class="form-signin" method="post">
+        <h2 class="form-signin-heading">Merci de se connecter</h2>
+{% csrf_token %}
+{% bootstrap_form form %}
+{% bootstrap_button 'Connection' size='lg' button_type="submit" button_class="btn-block"%}
+      </form>
+</div>
+<div class="col-md-3"></div>
+</div>
+    </div> <!-- /container -->
+{% endblock %}
+

cas_server/templates/cas_server/proxy.xml

@@ -0,0 +1,5 @@
+<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
+      <cas:proxySuccess>
+          <cas:proxyTicket>{{ticket}}</cas:proxyTicket>
+      </cas:proxySuccess>
+  </cas:serviceResponse>

cas_server/templates/cas_server/serviceValidate.xml

@@ -0,0 +1,19 @@
+<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
+  <cas:authenticationSuccess>
+    <cas:user>{{username}}</cas:user>
+    <cas:attributes>
+{% for key, value in attributes %}      <cas:{{key}}>{{value}}</cas:{{key}}>
+{% endfor %}
+    </cas:attributes>
+{% if proxyGrantingTicket %}
+    <cas:proxyGrantingTicket>{{proxyGrantingTicket}}</cas:proxyGrantingTicket>
+{% endif %}
+{% if  proxies %}
+    <cas:proxies>
+    {% for proxy in proxies %}
+      <cas:proxy>{{proxy}}</cas:proxy>
+    {% endfor %}
+    </cas:proxies>
+{% endif %}
+  </cas:authenticationSuccess>
+</cas:serviceResponse>

cas_server/templates/cas_server/serviceValidateError.xml

@@ -0,0 +1,5 @@
+<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
+ <cas:authenticationFailure code="{{code}}">
+    {{msg}}
+  </cas:authenticationFailure>
+</cas:serviceResponse>

cas_server/templates/cas_server/warn.html

@@ -0,0 +1,20 @@
+{% extends "cas_server/base.html" %}
+{% load bootstrap3 %}
+{% load staticfiles %}
+{% block bootstrap3_extra_head %}
+<link href="{% static "cas_server/login.css" %}" rel="stylesheet">
+{% endblock %}
+{% block bootstrap3_content %}
+<div class="container">
+<div class="row">
+<div class="col-md-3"></div>
+<div class="col-md-6">
+{% bootstrap_messages %}
+<div class="alert alert-warning" role="alert">Une demande d'authentification a été émise pour le service {{service}}</div>
+{% bootstrap_button 'Se connecter au service' size='lg' button_class="btn-primary btn-block" href=service_ticket_url %}
+</div>
+<div class="col-md-3"></div>
+</div>
+    </div> <!-- /container -->
+{% endblock %}
+

cas_server/tests.py

@@ -0,0 +1,3 @@
+from django.test import TestCase
+
+# Create your tests here.

cas_server/urls.py

@@ -0,0 +1,18 @@
+# ⁻*- coding: utf-8 -*-
+from django.conf.urls import patterns, url
+from django.views.generic import RedirectView
+
+import views
+
+urlpatterns = patterns('',
+    url(r'^$', RedirectView.as_view(pattern_name="login")),
+    url('^login$', views.login, name='login'),
+    url('^logout$', views.logout, name='logout'),
+    url('^validate$', views.validate, name='validate'),
+    url('^serviceValidate$', views.serviceValidate, name='serviceValidate'),
+    url('^proxyValidate$', views.proxyValidate, name='proxyValidate'),
+    url('^proxy$', views.proxy, name='proxy'),
+    url('^p3/serviceValidate$', views.p3_serviceValidate, name='p3_serviceValidate'),
+    url('^p3/proxyValidate$', views.p3_proxyValidate, name='p3_proxyValidate'),
+)
+

cas_server/utils.py

@@ -0,0 +1,10 @@
+import urlparse
+import urllib
+
+def update_url(url, params):
+    url = urlparse.urlparse(url)
+    url_parts = list(urlparse.urlparse(service))
+    query = dict(urlparse.parse_qsl(url_parts[4]))
+    query.update(params)
+    url_parts[4] = urllib.urlencode(query)
+    return urlparse.urlunparse(url_parts)

cas_server/views.py

@@ -0,0 +1,199 @@
+# ⁻*- coding: utf-8 -*-
+from django.shortcuts import render, redirect
+from django.http import HttpResponse, StreamingHttpResponse
+from django.conf import settings
+from django.contrib import messages
+
+import requests
+from datetime import datetime, timedelta
+
+import utils
+import forms
+import models
+
+def _logout(request):
+    try: del request.session["authenticated"]
+    except KeyError: pass
+    try: del request.session["username"]
+    except KeyError: pass
+    try: del request.session["warn"]
+    except KeyError: pass
+
+def login(request):
+    user = None
+    form = None
+    service_pattern = None
+    renewed = False
+    if request.method == 'POST':
+        service = request.POST.get('service')
+        renew = True if request.POST.get('renew') else False
+        gateway = request.POST.get('gateway')
+        method = request.POST.get('method')
+
+        if not request.session.get("authenticated") or renew:
+            form = forms.UserCredential(request.POST, initial={'service':service,'method':method,'warn':request.session.get("warn")})
+            if form.is_valid():
+                user = models.User.objects.get(username=form.cleaned_data['username'])
+                request.session["username"] = form.cleaned_data['username']
+                request.session["warn"] = True if form.cleaned_data.get("warn") else False
+                request.session["authenticated"] = True
+                renewed = True
+            else:
+                _logout(request)
+    else:
+        service = request.GET.get('service')
+        renew = True if request.GET.get('renew') else False
+        gateway = request.GET.get('gateway')
+        method = request.GET.get('method')
+
+        if not request.session.get("authenticated") or renew:
+            form = forms.UserCredential(initial={'service':service,'method':method,'warn':request.session.get("warn")})
+            
+    # if authenticated and successfully renewed authentication if needed
+    if request.session.get("authenticated") and (not renew or renewed):
+        try:
+            user = models.User.objects.get(username=request.session["username"])
+        except models.User.DoesNotExist:
+            _logout(request)
+
+        # if login agains a service is requestest
+        if service:
+            try:
+                # is the service allowed
+                service_pattern = models.ServicePattern.validate(service)
+                # is the current user allowed on this service
+                service_pattern.check_user(user)
+                # if the user has asked to be warned before any login to a service (no transparent SSO)
+                if request.session["warn"]:
+                    return render(request, settings.CAS_WARN_TEMPLATE, {'service_ticket_url':user.get_service_url(service, service_pattern, renew=renew),'service':service})
+                else:
+                    return redirect(user.get_service_url(service, service_pattern, renew=renew)) # redirect, using method ?
+            except models.ServicePattern.DoesNotExist:
+                messages.add_message(request, messages.ERROR, u'Service %s non autorisé.' % service)
+            except models.BadUsername:
+                messages.add_message(request, messages.ERROR, u"Nom d'utilisateur non autorisé")
+            except models.BadFilter:
+                messages.add_message(request, messages.ERROR, u"Caractéristique utilisateur non autorisé")
+
+            # if gateway is set and auth failed redirect to the service without authentication
+            if gateway:
+                list(messages.get_messages(request)) # clean messages before leaving the django app
+                return redirect(service)
+
+        return render(request, settings.CAS_LOGGED_TEMPLATE, {})
+    else:
+        if service:
+            if gateway:
+                list(messages.get_messages(request)) # clean messages before leaving the django app
+                return redirect(service)
+        return render(request, settings.CAS_LOGIN_TEMPLATE, {'form':form})
+
+def logout(request):
+    service = request.GET.get('service')
+    if request.session.get("authenticated"):
+        user = models.User.objects.get(username=request.session["username"])
+        user.logout(request)
+        user.delete()
+        _logout(request)
+    # if service is set, redirect to service after logout
+    if service:
+        list(messages.get_messages(request)) # clean messages before leaving the django app
+        return redirect(service)
+    # else redirect to login page
+    else:
+        messages.add_message(request, messages.SUCCESS, u'Déconnecté avec succès')
+        return redirect("login")
+
+def validate(request):
+    service = request.GET.get('service')
+    ticket = request.GET.get('ticket')
+    renew = True if request.GET.get('renew') else False
+    if service and ticket:
+        try:
+            ticket = models.ServiceTicket.objects.get(value=ticket, service=service, validate=False, renew=renew, creation__gt=(datetime.now() - timedelta(seconds=settings.CAS_TICKET_VALIDITY)))
+            ticket.validate = True
+            ticket.save()
+            return HttpResponse("yes\n", content_type="text/plain")
+        except models.ServiceTicket.DoesNotExist:
+            return HttpResponse("no\n", content_type="text/plain")
+    else:
+        return HttpResponse("no\n", content_type="text/plain")
+
+    
+def psValidate(request, typ=['ST']):
+    service = request.GET.get('service')
+    ticket = request.GET.get('ticket')
+    pgtUrl = request.GET.get('pgtUrl')
+    renew = True if request.GET.get('renew') else False
+    if service and ticket:
+        for t in typ:
+            if ticket.startswith(t):
+                break
+        else:
+            return render(request, "cas_server/serviceValidateError.xml", {'code':'INVALID_TICKET'}, content_type="text/xml; charset=utf-8")
+        try:
+            proxies = []
+            if ticket.startswith("ST"):
+                ticket = models.ServiceTicket.objects.get(value=ticket, service=service, validate=False, renew=renew, creation__gt=(datetime.now() - timedelta(seconds=settings.CAS_TICKET_VALIDITY)))
+            elif ticket.startswith("PT"):
+                ticket = models.ProxyTicket.objects.get(value=ticket, service=service, validate=False, renew=renew, creation__gt=(datetime.now() - timedelta(seconds=settings.CAS_TICKET_VALIDITY)))
+                for p in ticket.proxies.all():
+                    proxies.add(p.url)
+            ticket.validate = True
+            ticket.save()
+            attributes = []
+            for key, value in ticket.attributs.items():
+                if isinstance(value, list):
+                    for v in value:
+                        attributes.append((key, v))
+                else:
+                    attributes.append((key, value))
+            params = {'username':ticket.user.username, 'attributes':attributes, 'proxies':proxies}
+            if pgtUrl and pgtUrl.startswith("https://"):
+                pattern = modele.ServicePattern(pgtUrl)
+                if pattern.proxy:
+                    proxyid = models._gen_ticket('PGTIOU')
+                    pticket = models.ProxyGrantingTicket.objects.create(user=ticket.user, service=pgtUrl)
+                    url = utils.update_url(pgtUrl, {'pgtIou':proxyid, 'pgtId':pticket.value})
+                    try:
+                        r = requests.get(url, verify=settings.CAS_PROXY_CA_CERTIFICATE_PATH)
+                        if r.status_code == 200:
+                            params['proxyGrantingTicket'] = proxyid
+                        else:
+                            pticket.delete()
+                        return render(request, "cas_server/serviceValidate.xml", params, content_type="text/xml; charset=utf-8")
+                    except requests.exceptions.SSLError:
+                        return render(request, "cas_server/serviceValidateError.xml", {'code':'INVALID_PROXY_CALLBACK'}, content_type="text/xml; charset=utf-8")
+                else:
+                    return render(request, "cas_server/serviceValidateError.xml", {'code':'INVALID_PROXY_CALLBACK'}, content_type="text/xml; charset=utf-8")
+            else:
+                return render(request, "cas_server/serviceValidate.xml", params, content_type="text/xml; charset=utf-8")
+        except (models.ServiceTicket.DoesNotExist, models.ProxyTicket.DoesNotExist):
+            return render(request, "cas_server/serviceValidateError.xml", {'code':'INVALID_TICKET'}, content_type="text/xml; charset=utf-8")
+    else:
+        return render(request, "cas_server/serviceValidateError.xml", {'code':'INVALID_REQUEST'}, content_type="text/xml; charset=utf-8")
+
+def serviceValidate(request):
+    return psValidate(request)
+def proxyValidate(request):
+    return psValidate(request, ["ST", "PT"])
+
+def proxy(request):
+    pgt = request.GET.get('pgt')
+    targetService = request.GET.get('targetService')
+    if pgt and targetService:
+        try:
+            ticket = models.ProxyGrantingTicket.objects.get(value=pgt, creation__gt=(datetime.now() - timedelta(seconds=settings.CAS_TICKET_VALIDITY)))
+            pticket = models.ProxyTicket.objects.create(user=ticket.user, service=targetService)
+            pticket.proxies.create(url=ticket.service)
+            return render(request, "cas_server/proxy.xml", {'ticket':pticket.value}, content_type="text/xml; charset=utf-8")
+        except models.ProxyGrantingTicket.DoesNotExist:
+            return render(request, "cas_server/serviceValidateError.xml", {'code':'INVALID_TICKET'}, content_type="text/xml; charset=utf-8")
+    else:
+        return render(request, "cas_server/serviceValidateError.xml", {'code':'INVALID_REQUEST'}, content_type="text/xml; charset=utf-8")
+
+def p3_serviceValidate(request):
+    return serviceValidate(request)
+
+def p3_proxyValidate(request):
+    return proxyValidate(request)