django-cas-server/cas_server/views.py

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# ⁻*- coding: utf-8 -*-
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import default_settings
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from django.shortcuts import render, redirect
from django.http import HttpResponse, StreamingHttpResponse
from django.conf import settings
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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import requests
from datetime import datetime, timedelta
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from lxml import etree
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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
warned = False
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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'])
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request.session.set_expiry(0)
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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
warned = True
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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.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})
return render(request, settings.CAS_WARN_TEMPLATE, {'service_ticket_url':user.get_service_url(service, service_pattern, renew=renew)})
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else:
return redirect(user.get_service_url(service, service_pattern, renew=renew)) # redirect, using method ?
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
if gateway:
list(messages.get_messages(request)) # clean messages before leaving the django app
return redirect(service)
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return render(request, settings.CAS_LOGGED_TEMPLATE, {'session':request.session})
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else:
if service:
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try:
service_pattern = models.ServicePattern.validate(service)
if gateway:
list(messages.get_messages(request)) # clean messages before leaving the django app
return redirect(service)
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})
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:
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messages.add_message(request, messages.SUCCESS, _(u'Successfully logout'))
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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}
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if ticket.service_pattern.user_field and ticket.user.attributs.get(ticket.service_pattern.user_field):
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:
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})
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")
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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")
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:
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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)
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")
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)
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@csrf_exempt
def samlValidate(request):
if request.method == 'POST':
target = request.GET.get('TARGET')
root = etree.fromstring(request.body)
try:
auth_req = root.getchildren()[1].getchildren()[0]
IssueInstant = auth_req.attrib['IssueInstant']
RequestID = auth_req.attrib['RequestID']
ticket = auth_req.getchildren()[0].text
ticket = models.ServiceTicket.objects.get(value=ticket, service=target, validate=False, creation__gt=(datetime.now() - timedelta(seconds=settings.CAS_TICKET_VALIDITY)))
ticket.validate = True
ticket.save()
expireInstant = (ticket.creation + timedelta(seconds=settings.CAS_TICKET_VALIDITY)).isoformat()
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 = {'IssueInstant':IssueInstant, 'expireInstant':expireInstant,'Recipient':target, 'ResponseID':RequestID, 'username':ticket.user.username, 'attributes':attributes}
if ticket.service_pattern.user_field and ticket.user.attributs.get(ticket.service_pattern.user_field):
params['username'] = ticket.user.attributs.get(ticket.service_pattern.user_field)
return render(request, "cas_server/samlValidate.xml", params, content_type="text/xml; charset=utf-8")
except IndexError:
return render(request, "cas_server/samlValidateError.xml", {'code':'VersionMismatch'}, content_type="text/xml; charset=utf-8")
except KeyError:
return render(request, "cas_server/samlValidateError.xml", {'code':'VersionMismatch'}, content_type="text/xml; charset=utf-8")
except models.ServiceTicket.DoesNotExist:
return render(request, "cas_server/samlValidateError.xml", {'code':'AuthnFailed'}, content_type="text/xml; charset=utf-8")
else:
return redirect("login")