265 lines
14 KiB
Python
265 lines
14 KiB
Python
# ⁻*- coding: utf-8 -*-
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import default_settings
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from django.shortcuts import render, redirect
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from django.http import HttpResponse, StreamingHttpResponse
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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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import requests
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import urllib
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from datetime import datetime, timedelta
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from lxml import etree
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import utils
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import forms
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import models
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def _logout(request):
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try: del request.session["authenticated"]
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except KeyError: pass
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try: del request.session["username"]
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except KeyError: pass
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try: del request.session["warn"]
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except KeyError: pass
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def redirect_params(url_name, params={}):
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url = reverse(url_name, args = args)
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params = urllib.urlencode(params)
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return HttpResponseRedirect(url + "?%s" % params)
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def login(request):
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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(request.POST, initial={'service':service,'method':method,'warn':request.session.get("warn")})
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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(initial={'service':service,'method':method,'warn':request.session.get("warn")})
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# if authenticated and successfully renewed authentication if needed
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if request.session.get("authenticated") and 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 (no transparent SSO)
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if request.session.get("warn", True) and not warned:
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messages.add_message(request, messages.WARNING, _(u"Authentication has been required by service %(name)s (%(url)s)") % {'name':service_pattern.name, 'url':service})
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return render(request, settings.CAS_WARN_TEMPLATE, {'service_ticket_url':user.get_service_url(service, service_pattern, renew=renew)})
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else:
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return redirect(user.get_service_url(service, service_pattern, renew=renew)) # redirect, using method ?
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except models.ServicePattern.DoesNotExist:
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messages.add_message(request, messages.ERROR, _(u'Service %(url)s non allowed.') % {'url' : service})
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except models.BadUsername:
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messages.add_message(request, messages.ERROR, _(u"Username non allowed"))
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except models.BadFilter:
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messages.add_message(request, messages.ERROR, _(u"User charateristics non allowed"))
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except models.UserFieldNotDefined:
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messages.add_message(request, messages.ERROR, _(u"The attribut %(field)s is needed to use that service") % {'field':service_pattern.user_field})
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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 the django app
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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(request, messages.WARNING, _(u"Authentication renewal required by service %(name)s (%(url)s).") % {'name':service_pattern.name, 'url':service})
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else:
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messages.add_message(request, messages.WARNING, _(u"Authentication required by service %(name)s (%(url)s).") % {'name':service_pattern.name, 'url':service})
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except models.ServicePattern.DoesNotExist:
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messages.add_message(request, messages.ERROR, _(u'Service %s non allowed') % service)
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return render(request, settings.CAS_LOGIN_TEMPLATE, {'form':form})
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def logout(request):
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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 = 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(value=ticket, service=service, validate=False, renew=renew, creation__gt=(datetime.now() - timedelta(seconds=settings.CAS_TICKET_VALIDITY)))
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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 psValidate(request, typ=['ST']):
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service = request.GET.get('service')
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ticket = request.GET.get('ticket')
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pgtUrl = 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 t in typ:
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if ticket.startswith(t):
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break
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else:
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return render(request, "cas_server/serviceValidateError.xml", {'code':'INVALID_TICKET'}, content_type="text/xml; charset=utf-8")
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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(value=ticket, service=service, validate=False, renew=renew, creation__gt=(datetime.now() - timedelta(seconds=settings.CAS_TICKET_VALIDITY)))
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elif ticket.startswith("PT"):
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ticket = models.ProxyTicket.objects.get(value=ticket, service=service, validate=False, renew=renew, creation__gt=(datetime.now() - timedelta(seconds=settings.CAS_TICKET_VALIDITY)))
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for p in ticket.proxies.all():
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proxies.append(p.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 v in value:
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attributes.append((key, v))
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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 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 pgtUrl and pgtUrl.startswith("https://"):
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pattern = models.ServicePattern.validate(pgtUrl)
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if pattern.proxy:
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proxyid = models._gen_ticket('PGTIOU')
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pticket = models.ProxyGrantingTicket.objects.create(user=ticket.user, service=pgtUrl, service_pattern=pattern)
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url = utils.update_url(pgtUrl, {'pgtIou':proxyid, 'pgtId':pticket.value})
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try:
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r = requests.get(url, verify=settings.CAS_PROXY_CA_CERTIFICATE_PATH)
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if r.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(request, "cas_server/serviceValidate.xml", params, content_type="text/xml; charset=utf-8")
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except requests.exceptions.SSLError:
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return render(request, "cas_server/serviceValidateError.xml", {'code':'INVALID_PROXY_CALLBACK'}, content_type="text/xml; charset=utf-8")
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else:
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return render(request, "cas_server/serviceValidateError.xml", {'code':'INVALID_PROXY_CALLBACK'}, content_type="text/xml; charset=utf-8")
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else:
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return render(request, "cas_server/serviceValidate.xml", params, content_type="text/xml; charset=utf-8")
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except (models.ServiceTicket.DoesNotExist, models.ProxyTicket.DoesNotExist, models.ServicePattern.DoesNotExist):
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return render(request, "cas_server/serviceValidateError.xml", {'code':'INVALID_TICKET'}, content_type="text/xml; charset=utf-8")
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else:
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return render(request, "cas_server/serviceValidateError.xml", {'code':'INVALID_REQUEST'}, content_type="text/xml; charset=utf-8")
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def serviceValidate(request):
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return psValidate(request)
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def proxyValidate(request):
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return psValidate(request, ["ST", "PT"])
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def proxy(request):
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pgt = request.GET.get('pgt')
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targetService = request.GET.get('targetService')
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if pgt and targetService:
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try:
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pattern = models.ServicePattern.validate(targetService)
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ticket = models.ProxyGrantingTicket.objects.get(value=pgt, creation__gt=(datetime.now() - timedelta(seconds=settings.CAS_TICKET_VALIDITY)))
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pattern.check_user(ticket.user)
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pticket = ticket.user.get_ticket(models.ProxyTicket, targetService, pattern, False)
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pticket.proxies.create(url=ticket.service)
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return render(request, "cas_server/proxy.xml", {'ticket':pticket.value}, content_type="text/xml; charset=utf-8")
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except (models.ProxyGrantingTicket.DoesNotExist, models.ServicePattern.DoesNotExist, models.BadUsername, models.BadFilter):
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return render(request, "cas_server/serviceValidateError.xml", {'code':'INVALID_TICKET'}, content_type="text/xml; charset=utf-8")
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else:
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return render(request, "cas_server/serviceValidateError.xml", {'code':'INVALID_REQUEST'}, content_type="text/xml; charset=utf-8")
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def p3_serviceValidate(request):
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return serviceValidate(request)
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def p3_proxyValidate(request):
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return proxyValidate(request)
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@csrf_exempt
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def samlValidate(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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IssueInstant = auth_req.attrib['IssueInstant']
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RequestID = auth_req.attrib['RequestID']
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ticket = auth_req.getchildren()[0].text
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ticket = models.ServiceTicket.objects.get(value=ticket, service=target, validate=False, creation__gt=(datetime.now() - timedelta(seconds=settings.CAS_TICKET_VALIDITY)))
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ticket.validate = True
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ticket.save()
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expireInstant = (ticket.creation + 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 v in value:
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attributes.append((key, v))
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else:
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attributes.append((key, value))
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params = {'IssueInstant':IssueInstant, 'expireInstant':expireInstant,'Recipient':target, 'ResponseID':RequestID, 'username':ticket.user.username, 'attributes':attributes}
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if ticket.service_pattern.user_field and 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(request, "cas_server/samlValidate.xml", params, content_type="text/xml; charset=utf-8")
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except IndexError:
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return render(request, "cas_server/samlValidateError.xml", {'code':'VersionMismatch'}, content_type="text/xml; charset=utf-8")
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except KeyError:
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return render(request, "cas_server/samlValidateError.xml", {'code':'VersionMismatch'}, content_type="text/xml; charset=utf-8")
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except models.ServiceTicket.DoesNotExist:
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return render(request, "cas_server/samlValidateError.xml", {'code':'AuthnFailed'}, content_type="text/xml; charset=utf-8")
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else:
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return redirect("login")
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