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django-cas-server
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Add SLO support from federated CAS

This commit is contained in:
Valentin Samir 2016-06-23 17:18:53 +02:00
parent e820a3a57a
commit 6d7300fe43
6 changed files with 143 additions and 23 deletions
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36
cas_server/federate.py
View File

@ -12,7 +12,11 @@
from .default_settings import settings
from .cas import CASClient
from .models import FederatedUser
from .models import FederatedUser, FederateSLO, User
from importlib import import_module
SessionStore = import_module(settings.SESSION_ENGINE).SessionStore
class CASFederateValidateUser(object):
@ -68,3 +72,33 @@ class CASFederateValidateUser(object):
return True
else:
return False
def register_slo(self, username, session_key, ticket):
FederateSLO.objects.create(
username=username,
session_key=session_key,
ticket=ticket
)
def clean_sessions(self, logout_request):
try:
SLOs = self.client.get_saml_slos(logout_request)
except NameError:
SLOs = []
for slo in SLOs:
try:
for federate_slo in FederateSLO.objects.filter(ticket=slo.text):
session = SessionStore(session_key=federate_slo.session_key)
session.flush()
try:
user = User.objects.get(
username=federate_slo.username,
session_key=federate_slo.session_key
)
user.logout()
user.delete()
except User.DoesNotExist:
pass
federate_slo.delete()
except FederateSLO.DoesNotExist:
pass

4
cas_server/management/commands/cas_clean_federate.py
View File

@ -16,6 +16,8 @@ class Command(BaseCommand):
federated_users = models.FederatedUser.objects.filter(
last_update__lt=(timezone.now() - timedelta(seconds=settings.CAS_TICKET_TIMEOUT))
)
known_users = {user.username for user in models.User.objects.all()}
for user in federated_users:
if not models.User.objects.filter(username='%s@%s' % (user.username, user.provider)):
if not ('%s@%s' % (user.username, user.provider)) in known_users:
user.delete()
models.FederateSLO.clean_deleted_sessions()

28
cas_server/migrations/0006_auto_20160623_1516.py Normal file
View File

@ -0,0 +1,28 @@
# -*- coding: utf-8 -*-
# Generated by Django 1.9.7 on 2016-06-23 15:16
from __future__ import unicode_literals
from django.db import migrations, models
class Migration(migrations.Migration):
dependencies = [
('cas_server', '0005_auto_20160616_1018'),
]
operations = [
migrations.CreateModel(
name='FederateSLO',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('username', models.CharField(max_length=30)),
('session_key', models.CharField(blank=True, max_length=40, null=True)),
('ticket', models.CharField(max_length=255)),
],
),
migrations.AlterUniqueTogether(
name='federateslo',
unique_together=set([('username', 'session_key')]),
),
]

19
cas_server/models.py
View File

@ -48,6 +48,25 @@ class FederatedUser(models.Model):
return u"%s@%s" % (self.username, self.provider)
class FederateSLO(models.Model):
class Meta:
unique_together = ("username", "session_key")
username = models.CharField(max_length=30)
session_key = models.CharField(max_length=40, blank=True, null=True)
ticket = models.CharField(max_length=255)
@property
def provider(self):
component = self.username.split("@")
return component[-1]
@classmethod
def clean_deleted_sessions(cls):
for federate_slo in cls.objects.all():
if not SessionStore(session_key=federate_slo.session_key).get('authenticated'):
federate_slo.delete()
class User(models.Model):
"""A user logged into the CAS"""
class Meta:

2
cas_server/utils.py
View File

@ -184,6 +184,8 @@ def gen_saml_id():
def get_tuple(tuple, index, default=None):
if tuple is None:
return default
try:
return tuple[index]
except IndexError:

77
cas_server/views.py
View File

@ -20,7 +20,7 @@ from django.utils.decorators import method_decorator
from django.utils.translation import ugettext as _
from django.utils import timezone
from django.views.decorators.csrf import csrf_exempt
from django.middleware.csrf import CsrfViewMiddleware
from django.views.generic import View
import logging
@ -78,6 +78,11 @@ class LogoutMixin(object):
username=username,
session_key=self.request.session.session_key
)
if settings.CAS_FEDERATE:
models.FederateSLO.objects.filter(
username=username,
session_key=self.request.session.session_key
).delete()
self.request.session.flush()
user.logout(self.request)
user.delete()
@ -181,43 +186,73 @@ class LogoutView(View, LogoutMixin):
class FederateAuth(View):
@method_decorator(csrf_exempt)
def dispatch(self, request, *args, **kwargs):
return super(FederateAuth, self).dispatch(request, *args, **kwargs)
def get_cas_client(self, request, provider):
if provider in settings.CAS_FEDERATE_PROVIDERS:
service_url = utils.get_current_url(request, {"ticket", "provider"})
return CASFederateValidateUser(provider, service_url)
def post(self, request, provider=None):
if not settings.CAS_FEDERATE:
return redirect("cas_server:login")
form = forms.FederateSelect(request.POST)
if form.is_valid():
params = utils.copy_params(
request.POST,
ignore={"provider", "csrfmiddlewaretoken", "ticket"}
)
url = utils.reverse_params(
"cas_server:federateAuth",
kwargs=dict(provider=form.cleaned_data["provider"]),
params=params
)
response = HttpResponseRedirect(url)
if form.cleaned_data["remember"]:
max_age = settings.CAS_FEDERATE_REMEMBER_TIMEOUT
utils.set_cookie(response, "_remember_provider", request.POST["provider"], max_age)
return response
# POST with a provider, this is probably an SLO request
if provider in settings.CAS_FEDERATE_PROVIDERS:
auth = self.get_cas_client(request, provider)
try:
auth.clean_sessions(request.POST['logoutRequest'])
except KeyError:
pass
return HttpResponse("ok")
# else, a User is trying to log in using an identity provider
else:
return redirect("cas_server:login")
# Manually checking for csrf to protect the code below
reason = CsrfViewMiddleware().process_view(request, None, (), {})
if reason is not None:
return reason # Failed the test, stop here.
form = forms.FederateSelect(request.POST)
if form.is_valid():
params = utils.copy_params(
request.POST,
ignore={"provider", "csrfmiddlewaretoken", "ticket"}
)
url = utils.reverse_params(
"cas_server:federateAuth",
kwargs=dict(provider=form.cleaned_data["provider"]),
params=params
)
response = HttpResponseRedirect(url)
if form.cleaned_data["remember"]:
max_age = settings.CAS_FEDERATE_REMEMBER_TIMEOUT
utils.set_cookie(
response,
"_remember_provider",
request.POST["provider"],
max_age
)
return response
else:
return redirect("cas_server:login")
def get(self, request, provider=None):
if not settings.CAS_FEDERATE:
return redirect("cas_server:login")
if provider not in settings.CAS_FEDERATE_PROVIDERS:
return redirect("cas_server:login")
service_url = utils.get_current_url(request, {"ticket", "provider"})
auth = CASFederateValidateUser(provider, service_url)
auth = self.get_cas_client(request, provider)
if 'ticket' not in request.GET:
return HttpResponseRedirect(auth.get_login_url())
else:
ticket = request.GET['ticket']
if auth.verify_ticket(ticket):
params = utils.copy_params(request.GET, ignore={"ticket"})
request.session["federate_username"] = "%s@%s" % (auth.username, auth.provider)
username = "%s@%s" % (auth.username, auth.provider)
request.session["federate_username"] = username
request.session["federate_ticket"] = ticket
auth.register_slo(username, request.session.session_key, ticket)
url = utils.reverse_params("cas_server:login", params)
return HttpResponseRedirect(url)
else: