498 lines
19 KiB
Python
498 lines
19 KiB
Python
# ⁻*- coding: utf-8 -*-
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License version 3 for
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# more details.
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#
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# You should have received a copy of the GNU General Public License version 3
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# along with this program; if not, write to the Free Software Foundation, Inc., 51
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# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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# (c) 2015 Valentin Samir
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"""views for the app"""
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from . import default_settings
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from django.shortcuts import render, redirect
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from django.http import HttpResponse, HttpResponseRedirect
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from django.conf import settings
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from django.contrib import messages
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from django.views.decorators.csrf import csrf_exempt
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from django.utils.translation import ugettext as _
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from django.core.urlresolvers import reverse
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from django.utils import timezone
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import requests
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import urllib
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from lxml import etree
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from datetime import timedelta
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from . import utils
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from . import forms
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from . import models
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def _logout(request):
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"""Clean sessions variables"""
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try:
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del request.session["authenticated"]
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except KeyError:
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pass
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try:
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del request.session["username"]
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except KeyError:
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pass
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try:
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del request.session["warn"]
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except KeyError:
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pass
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def redirect_params(url_name, params=None):
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"""Redirect to `url_name` with `params` as querystring"""
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url = reverse(url_name)
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params = urllib.urlencode(params if params else {})
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return HttpResponseRedirect(url + "?%s" % params)
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def login(request):
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"""credential requestor / acceptor"""
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user = None
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form = None
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service_pattern = None
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renewed = False
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warned = False
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if request.method == 'POST':
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service = request.POST.get('service')
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renew = True if request.POST.get('renew') else False
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gateway = request.POST.get('gateway')
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method = request.POST.get('method')
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if not request.session.get("authenticated") or renew:
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form = forms.UserCredential(
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request.POST,
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initial={'service':service, 'method':method, 'warn':request.session.get("warn")}
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)
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if form.is_valid():
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user = models.User.objects.get(username=form.cleaned_data['username'])
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request.session.set_expiry(0)
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request.session["username"] = form.cleaned_data['username']
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request.session["warn"] = True if form.cleaned_data.get("warn") else False
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request.session["authenticated"] = True
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renewed = True
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warned = True
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else:
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_logout(request)
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else:
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service = request.GET.get('service')
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renew = True if request.GET.get('renew') else False
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gateway = request.GET.get('gateway')
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method = request.GET.get('method')
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if not request.session.get("authenticated") or renew:
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form = forms.UserCredential(
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initial={'service':service, 'method':method, 'warn':request.session.get("warn")}
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)
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# if authenticated and successfully renewed authentication if needed
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if request.session.get("authenticated") and \
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request.session.get("username") and (not renew or renewed):
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try:
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user = models.User.objects.get(username=request.session["username"])
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except models.User.DoesNotExist:
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_logout(request)
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return redirect_params("login", params=dict(request.GET))
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# if login agains a service is requestest
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if service:
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try:
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# is the service allowed
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service_pattern = models.ServicePattern.validate(service)
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# is the current user allowed on this service
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service_pattern.check_user(user)
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# if the user has asked to be warned before any login to a service
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if request.session.get("warn", True) and not warned:
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messages.add_message(
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request,
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messages.WARNING,
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_(u"Authentication has been required by service %(name)s (%(url)s)") % \
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{'name':service_pattern.name, 'url':service}
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)
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return render(
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request,
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settings.CAS_WARN_TEMPLATE,
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{'service_ticket_url':user.get_service_url(
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service,
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service_pattern,
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renew=renew
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)}
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)
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else:
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# redirect, using method ?
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return redirect(user.get_service_url(service, service_pattern, renew=renew))
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except models.ServicePattern.DoesNotExist:
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messages.add_message(
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request,
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messages.ERROR,
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_(u'Service %(url)s non allowed.') % {'url' : service}
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)
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except models.BadUsername:
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messages.add_message(
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request,
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messages.ERROR,
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_(u"Username non allowed")
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)
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except models.BadFilter:
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messages.add_message(
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request,
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messages.ERROR,
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_(u"User charateristics non allowed")
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)
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except models.UserFieldNotDefined:
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messages.add_message(
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request,
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messages.ERROR,
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_(u"The attribut %(field)s is needed to use" \
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" that service") % {'field':service_pattern.user_field}
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)
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# if gateway is set and auth failed redirect to the service without authentication
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if gateway:
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list(messages.get_messages(request)) # clean messages before leaving the django app
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return redirect(service)
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return render(request, settings.CAS_LOGGED_TEMPLATE, {'session':request.session})
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else:
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if service:
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try:
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service_pattern = models.ServicePattern.validate(service)
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if gateway:
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list(messages.get_messages(request)) # clean messages before leaving django
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return redirect(service)
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if request.session.get("authenticated") and renew:
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messages.add_message(
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request,
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messages.WARNING,
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_(u"Authentication renewal required by service" \
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" %(name)s (%(url)s).") % {'name':service_pattern.name, 'url':service}
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)
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else:
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messages.add_message(
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request,
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messages.WARNING,
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_(u"Authentication required by service" \
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" %(name)s (%(url)s).") % {'name':service_pattern.name, 'url':service}
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)
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except models.ServicePattern.DoesNotExist:
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messages.add_message(
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request,
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messages.ERROR,
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_(u'Service %s non allowed') % service
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)
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return render(request, settings.CAS_LOGIN_TEMPLATE, {'form':form})
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def logout(request):
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"""destroy CAS session (logout)"""
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service = request.GET.get('service')
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if request.session.get("authenticated"):
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user = models.User.objects.get(username=request.session["username"])
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user.logout(request)
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user.delete()
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_logout(request)
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# if service is set, redirect to service after logout
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if service:
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list(messages.get_messages(request)) # clean messages before leaving the django app
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return redirect(service)
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# else redirect to login page
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else:
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messages.add_message(request, messages.SUCCESS, _(u'Successfully logout'))
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return redirect("login")
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def validate(request):
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"""service ticket validation"""
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service = request.GET.get('service')
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ticket = request.GET.get('ticket')
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renew = True if request.GET.get('renew') else False
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if service and ticket:
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try:
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ticket = models.ServiceTicket.objects.get(
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value=ticket,
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service=service,
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validate=False,
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renew=renew,
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creation__gt=(timezone.now() - timedelta(seconds=settings.CAS_TICKET_VALIDITY))
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)
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ticket.validate = True
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ticket.save()
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return HttpResponse("yes\n", content_type="text/plain")
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except models.ServiceTicket.DoesNotExist:
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return HttpResponse("no\n", content_type="text/plain")
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else:
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return HttpResponse("no\n", content_type="text/plain")
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def ps_validate(request, ticket_type=None):
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"""factorization for serviceValidate and proxyValidate"""
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if ticket_type is None:
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ticket_type = ['ST']
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service = request.GET.get('service')
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ticket = request.GET.get('ticket')
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pgt_url = request.GET.get('pgtUrl')
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renew = True if request.GET.get('renew') else False
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if service and ticket:
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for typ in ticket_type:
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if ticket.startswith(typ):
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break
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else:
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return render(
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request,
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"cas_server/serviceValidateError.xml",
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{'code':'INVALID_TICKET'},
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content_type="text/xml; charset=utf-8"
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)
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try:
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proxies = []
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if ticket.startswith("ST"):
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ticket = models.ServiceTicket.objects.get(
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value=ticket,
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service=service,
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validate=False,
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renew=renew,
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creation__gt=(timezone.now() - timedelta(seconds=settings.CAS_TICKET_VALIDITY))
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)
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elif ticket.startswith("PT"):
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ticket = models.ProxyTicket.objects.get(
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value=ticket,
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service=service,
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validate=False,
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renew=renew,
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creation__gt=(timezone.now() - timedelta(seconds=settings.CAS_TICKET_VALIDITY))
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)
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for prox in ticket.proxies.all():
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proxies.append(prox.url)
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ticket.validate = True
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ticket.save()
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attributes = []
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for key, value in ticket.attributs.items():
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if isinstance(value, list):
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for elt in value:
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attributes.append((key, elt))
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else:
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attributes.append((key, value))
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params = {'username':ticket.user.username, 'attributes':attributes, 'proxies':proxies}
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if ticket.service_pattern.user_field and \
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ticket.user.attributs.get(ticket.service_pattern.user_field):
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params['username'] = ticket.user.attributs.get(ticket.service_pattern.user_field)
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if pgt_url and pgt_url.startswith("https://"):
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pattern = models.ServicePattern.validate(pgt_url)
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if pattern.proxy:
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proxyid = models.gen_pgtiou()
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pticket = models.ProxyGrantingTicket.objects.create(
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user=ticket.user,
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service=pgt_url,
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service_pattern=pattern
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)
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url = utils.update_url(pgt_url, {'pgtIou':proxyid, 'pgtId':pticket.value})
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try:
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ret = requests.get(url, verify=settings.CAS_PROXY_CA_CERTIFICATE_PATH)
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if ret.status_code == 200:
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params['proxyGrantingTicket'] = proxyid
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else:
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pticket.delete()
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return render(
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request,
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"cas_server/serviceValidate.xml",
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params,
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content_type="text/xml; charset=utf-8"
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)
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except requests.exceptions.SSLError:
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return render(
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request,
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"cas_server/serviceValidateError.xml",
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{'code':'INVALID_PROXY_CALLBACK'},
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content_type="text/xml; charset=utf-8"
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)
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else:
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return render(
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request,
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"cas_server/serviceValidateError.xml",
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{'code':'INVALID_PROXY_CALLBACK'},
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content_type="text/xml; charset=utf-8"
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)
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else:
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return render(
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request,
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"cas_server/serviceValidate.xml",
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params,
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content_type="text/xml; charset=utf-8"
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)
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except (models.ServiceTicket.DoesNotExist, models.ProxyTicket.DoesNotExist):
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return render(
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request,
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"cas_server/serviceValidateError.xml",
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{'code':'INVALID_TICKET'},
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content_type="text/xml; charset=utf-8"
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)
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except models.ServicePattern.DoesNotExist:
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return render(
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request,
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"cas_server/serviceValidateError.xml",
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{'code':'INVALID_TICKET'},
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content_type="text/xml; charset=utf-8"
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)
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else:
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return render(
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request,
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"cas_server/serviceValidateError.xml",
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{'code':'INVALID_REQUEST'},
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content_type="text/xml; charset=utf-8"
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)
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def service_validate(request):
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"""service ticket validation CAS 2.0 (also work for CAS 3.0)"""
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return ps_validate(request)
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def proxy_validate(request):
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"""service/proxy ticket validation CAS 2.0 (also work for CAS 3.0)"""
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return ps_validate(request, ["ST", "PT"])
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def proxy(request):
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"""proxy ticket service"""
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pgt = request.GET.get('pgt')
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target_service = request.GET.get('targetService')
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if pgt and target_service:
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try:
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# is the target service allowed
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pattern = models.ServicePattern.validate(target_service)
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# is the proxy granting ticket valid
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ticket = models.ProxyGrantingTicket.objects.get(
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value=pgt,
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creation__gt=(timezone.now() - timedelta(seconds=settings.CAS_TICKET_VALIDITY))
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)
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# is the pgt user allowed on the target service
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pattern.check_user(ticket.user)
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pticket = ticket.user.get_ticket(models.ProxyTicket, target_service, pattern, False)
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pticket.proxies.create(url=ticket.service)
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return render(
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request,
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"cas_server/proxy.xml",
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{'ticket':pticket.value},
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content_type="text/xml; charset=utf-8"
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)
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except models.ProxyGrantingTicket.DoesNotExist:
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return render(
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request,
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"cas_server/serviceValidateError.xml",
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{'code':'INVALID_TICKET'},
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content_type="text/xml; charset=utf-8"
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)
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except models.ServicePattern.DoesNotExist:
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return render(
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request,
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"cas_server/serviceValidateError.xml",
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{'code':'INVALID_TICKET'},
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content_type="text/xml; charset=utf-8"
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)
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except models.BadUsername:
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return render(
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request,
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"cas_server/serviceValidateError.xml",
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{'code':'INVALID_TICKET'},
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content_type="text/xml; charset=utf-8"
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)
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except models.BadFilter:
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return render(
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request,
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"cas_server/serviceValidateError.xml",
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{'code':'INVALID_TICKET'},
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content_type="text/xml; charset=utf-8"
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)
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except models.UserFieldNotDefined:
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return render(
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request,
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"cas_server/serviceValidateError.xml",
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{'code':'INVALID_TICKET'},
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content_type="text/xml; charset=utf-8"
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)
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else:
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return render(
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request,
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"cas_server/serviceValidateError.xml",
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{'code':'INVALID_REQUEST'},
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content_type="text/xml; charset=utf-8"
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)
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def p3_service_validate(request):
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"""service ticket validation CAS 3.0"""
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return service_validate(request)
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def p3_proxy_validate(request):
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"""service/proxy ticket validation CAS 3.0"""
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return proxy_validate(request)
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@csrf_exempt
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def saml_validate(request):
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"""checks the validity of a Service Ticket by a SAML 1.1 request"""
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if request.method == 'POST':
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target = request.GET.get('TARGET')
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root = etree.fromstring(request.body)
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try:
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auth_req = root.getchildren()[1].getchildren()[0]
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issue_instant = auth_req.attrib['IssueInstant']
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request_id = auth_req.attrib['RequestID']
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ticket = auth_req.getchildren()[0].text
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ticket = models.ServiceTicket.objects.get(
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value=ticket,
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service=target,
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validate=False,
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creation__gt=(timezone.now() - timedelta(seconds=settings.CAS_TICKET_VALIDITY))
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)
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ticket.validate = True
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ticket.save()
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expire_instant = (ticket.creation + \
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timedelta(seconds=settings.CAS_TICKET_VALIDITY)).isoformat()
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attributes = []
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for key, value in ticket.attributs.items():
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if isinstance(value, list):
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for elt in value:
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attributes.append((key, elt))
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else:
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attributes.append((key, value))
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params = {
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'IssueInstant':issue_instant,
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'expireInstant':expire_instant,
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'Recipient':target,
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'ResponseID':request_id,
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'username':ticket.user.username,
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'attributes':attributes
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}
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if ticket.service_pattern.user_field and \
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ticket.user.attributs.get(ticket.service_pattern.user_field):
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params['username'] = ticket.user.attributs.get(ticket.service_pattern.user_field)
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return render(
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request,
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"cas_server/samlValidate.xml",
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params,
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content_type="text/xml; charset=utf-8"
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)
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except IndexError:
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return render(
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request,
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"cas_server/samlValidateError.xml",
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{'code':'VersionMismatch'},
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content_type="text/xml; charset=utf-8"
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)
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except KeyError:
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return render(
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request,
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"cas_server/samlValidateError.xml",
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{'code':'VersionMismatch'},
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content_type="text/xml; charset=utf-8"
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)
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except models.ServiceTicket.DoesNotExist:
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return render(
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request,
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"cas_server/samlValidateError.xml",
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{'code':'AuthnFailed'},
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content_type="text/xml; charset=utf-8"
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)
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else:
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return redirect("login")
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