logger = logging.getLogger('cas_provider.views')
import urllib
+import logging
+from urllib import urlencode
+import urllib2
+import urlparse
+from functools import wraps
+
+from django.utils.decorators import available_attrs
+from django.views.decorators.debug import sensitive_post_parameters
+from django.views.decorators.cache import cache_control
+from django.utils.cache import patch_cache_control
+from django.views.decorators.csrf import csrf_protect
+
from django.http import HttpResponse, HttpResponseRedirect
+from django.conf import settings
+from django.contrib.auth import login as auth_login, logout as auth_logout
+from django.core.urlresolvers import get_callable
from django.shortcuts import render_to_response
from django.template import RequestContext
from django.contrib.auth import authenticate
-from django.contrib.auth import login as auth_login, logout as auth_logout
from django.core.urlresolvers import reverse
-from forms import LoginForm, MergeLoginForm
-from models import ServiceTicket
-from utils import create_service_ticket
-from exceptions import SameEmailMismatchedPasswords
+from lxml import etree
+from cas_provider.attribute_formatters import NSMAP, CAS
+from cas_provider.models import ProxyGrantingTicket, ProxyTicket
+from cas_provider.models import ServiceTicket
+
+from cas_provider.exceptions import SameEmailMismatchedPasswords
+from cas_provider.forms import LoginForm, MergeLoginForm
from . import signals
-__all__ = ['login', 'validate', 'logout']
+__all__ = ['login', 'validate', 'logout', 'service_validate']
+INVALID_TICKET = 'INVALID_TICKET'
+INVALID_SERVICE = 'INVALID_SERVICE'
+INVALID_REQUEST = 'INVALID_REQUEST'
+INTERNAL_ERROR = 'INTERNAL_ERROR'
-def _build_service_url(service, ticket):
- if service.find('?') == -1:
- return service + '?ticket=' + ticket.ticket
- else:
- return service + '&ticket=' + ticket.ticket
+ERROR_MESSAGES = (
+ (INVALID_TICKET, u'The provided ticket is invalid.'),
+ (INVALID_SERVICE, u'Service is invalid'),
+ (INVALID_REQUEST, u'Not all required parameters were sent.'),
+ (INTERNAL_ERROR, u'An internal error occurred during ticket validation'),
+ )
+
+
+logger = logging.getLogger(__name__)
+
+
+_never_cache = cache_control(no_cache=True, must_revalidate=True)
-def login(request, template_name='cas/login.html', success_redirect='/account/', merge=False):
+def never_cache(view_func):
+ """
+ Decorator that adds headers to a response so that it will
+ never be cached.
+ """
+ @wraps(view_func, assigned=available_attrs(view_func))
+ def _wrapped_view_func(request, *args, **kwargs):
+ response = view_func(request, *args, **kwargs)
+ patch_cache_control(response, no_cache=True,
+ must_revalidate=True, proxy_revalidate=True)
+ response['Pragma'] = 'no-cache'
+ return response
+ return _wrapped_view_func
+
+
+@sensitive_post_parameters()
+@csrf_protect
+@never_cache
+def login(request, template_name='cas/login.html',
+ success_redirect=settings.LOGIN_REDIRECT_URL,
+ warn_template_name='cas/warn.html', **kwargs):
+ merge = kwargs.get('merge', False)
logging.debug('CAS Provider Login view. Method is %s, merge is %s, template is %s.',
request.method, merge, template_name)
url = '%s?%s' % (base_url, args)
logging.debug('Redirecting to %s', url)
return HttpResponseRedirect(url)
-
+
if user is None:
errors.append('Incorrect username and/or password.')
else:
if not user.is_active:
errors.append('This account is disabled.')
else:
+ # Send the on_cas_login signal. If we get an HttpResponse, return that.
+ for receiver, response in signals.on_cas_login.send(sender=login, request=request, **kwargs):
+ if isinstance(response, HttpResponse):
+ return response
+
+ if service is None:
+ # Try and pull the service off the session
+ service = request.session.pop('service', service)
+
+ signals.on_cas_login_success.send(sender=login, request=request,
+ service=service, **kwargs)
+
if service is None:
# Normal internal success redirection.
logging.debug('Redirecting to %s', success_redirect)
return HttpResponseRedirect(success_redirect)
else:
+ if request.GET.get('warn', False):
+ return render_to_response(warn_template_name, {
+ 'service': service,
+ 'warn': False
+ }, context_instance=RequestContext(request))
+
# Create a service ticket and redirect to the service.
- ticket = create_service_ticket(request.user, service)
+ ticket = ServiceTicket.objects.create(service=service, user=user)
if 'service' in request.session:
# Don't need this any more.
del request.session['service']
- url = _build_service_url(service, ticket.ticket)
+ url = ticket.get_redirect_url()
logging.debug('Redirecting to %s', url)
return HttpResponseRedirect(url)
return render_to_response(template_name, {'form': form, 'errors': errors}, context_instance=RequestContext(request))
-def socialauth_login(request, template_name='cas/login.html', success_redirect='/account/'):
- """ Similiar to login but user has been authenticated already through social auth.
- This step authenticates the login and generates a service ticket.
- """
- user = request.user
- user.backend = 'django.contrib.auth.backends.ModelBackend'
- service = request.session.pop('service', '/')
- errors = []
- if user is not None:
- if user.is_active:
- auth_login(request, user)
- if service is not None:
- ticket = create_service_ticket(user, service)
- return HttpResponseRedirect(_build_service_url(service, ticket.ticket))
- else:
- return HttpResponseRedirect(success_redirect)
- else:
- errors.append('This account is disabled.')
- else:
- errors.append('Incorrect username and/or password.')
- return render_to_response(template_name, {'errors': errors}, context_instance=RequestContext(request))
-
-
+@never_cache
def validate(request):
+ """Validate ticket via CAS v.1 protocol
+ """
service = request.GET.get('service', None)
ticket_string = request.GET.get('ticket', None)
logger.info('Validating ticket %s for %s', ticket_string, service)
if service is not None and ticket_string is not None:
+ #renew = request.GET.get('renew', True)
+ #if not renew:
+ # TODO: check user SSO session
try:
ticket = ServiceTicket.objects.get(ticket=ticket_string)
+ assert ticket.service == service
except ServiceTicket.DoesNotExist:
logger.exception("Tried to validate with an invalid ticket %s for %s", ticket_string, service)
except Exception as e:
username = ticket.user.username
ticket.delete()
- results = signals.on_cas_collect_histories.send(sender=validate, for_email=ticket.user.email)
+ results = signals.on_cas_collect_histories.send(sender=validate, for_user=ticket.user)
histories = '\n'.join('\n'.join(rs) for rc, rs in results)
logger.info('Validated %s %s', username, "(also %s)" % histories if histories else '')
return HttpResponse("yes\n%s\n%s" % (username, histories))
logger.info('Validation failed.')
return HttpResponse("no\n\n")
-
-def logout(request, template_name='cas/logout.html'):
+
+@never_cache
+def logout(request, template_name='cas/logout.html',
+ auto_redirect=settings.CAS_AUTO_REDIRECT_AFTER_LOGOUT):
url = request.GET.get('url', None)
- auth_logout(request)
- return render_to_response(template_name, {'url': url}, context_instance=RequestContext(request))
+ if request.user.is_authenticated():
+ for ticket in ServiceTicket.objects.filter(user=request.user):
+ ticket.delete()
+ auth_logout(request)
+ if url and auto_redirect:
+ return HttpResponseRedirect(url)
+ return render_to_response(template_name, {'url': url},
+ context_instance=RequestContext(request))
+
+
+@never_cache
+def proxy(request):
+ targetService = request.GET['targetService']
+ pgt_id = request.GET['pgt']
+
+ try:
+ proxyGrantingTicket = ProxyGrantingTicket.objects.get(ticket=pgt_id)
+ except ProxyGrantingTicket.DoesNotExist:
+ return _cas2_error_response(INVALID_TICKET)
+
+ pt = ProxyTicket.objects.create(proxyGrantingTicket=proxyGrantingTicket,
+ user=proxyGrantingTicket.serviceTicket.user,
+ service=targetService)
+ return _cas2_proxy_success(pt.ticket)
+
+
+def ticket_validate(service, ticket_string, pgtUrl):
+ if service is None or ticket_string is None:
+ return _cas2_error_response(INVALID_REQUEST)
+
+ try:
+ if ticket_string.startswith('ST'):
+ ticket = ServiceTicket.objects.get(ticket=ticket_string)
+ elif ticket_string.startswith('PT'):
+ ticket = ProxyTicket.objects.get(ticket=ticket_string)
+ else:
+ return _cas2_error_response(INVALID_TICKET,
+ '%(ticket)s is neither Service (ST-...) nor Proxy Ticket (PT-...)' % {
+ 'ticket': ticket_string})
+ except ServiceTicket.DoesNotExist:
+ return _cas2_error_response(INVALID_TICKET)
+
+ ticketUrl = urlparse.urlparse(ticket.service)
+ serviceUrl = urlparse.urlparse(service)
+
+ if not(ticketUrl.hostname == serviceUrl.hostname and ticketUrl.path == serviceUrl.path and ticketUrl.port == serviceUrl.port):
+ return _cas2_error_response(INVALID_SERVICE)
+
+ pgtIouId = None
+ proxies = ()
+ if pgtUrl is not None:
+ pgt = generate_proxy_granting_ticket(pgtUrl, ticket)
+ if pgt:
+ pgtIouId = pgt.pgtiou
+
+ if hasattr(ticket, 'proxyticket'):
+ pgt = ticket.proxyticket.proxyGrantingTicket
+ # I am issued by this proxy granting ticket
+ if hasattr(pgt.serviceTicket, 'proxyticket'):
+ while pgt:
+ if hasattr(pgt.serviceTicket, 'proxyticket'):
+ proxies += (pgt.serviceTicket.service,)
+ pgt = pgt.serviceTicket.proxyticket.proxyGrantingTicket
+ else:
+ pgt = None
+
+ user = ticket.user
+ ticket.delete()
+ return _cas2_sucess_response(user, pgtIouId, proxies)
+
+
+@never_cache
+def service_validate(request):
+ """Validate ticket via CAS v.2 protocol"""
+ service = request.GET.get('service', None)
+ ticket_string = request.GET.get('ticket', None)
+ pgtUrl = request.GET.get('pgtUrl', None)
+ if ticket_string.startswith('PT-'):
+ return _cas2_error_response(INVALID_TICKET, "serviceValidate cannot verify proxy tickets")
+ else:
+ return ticket_validate(service, ticket_string, pgtUrl)
+
+
+@never_cache
+def proxy_validate(request):
+ """Validate ticket via CAS v.2 protocol"""
+ service = request.GET.get('service', None)
+ ticket_string = request.GET.get('ticket', None)
+ pgtUrl = request.GET.get('pgtUrl', None)
+ return ticket_validate(service, ticket_string, pgtUrl)
+
+
+def generate_proxy_granting_ticket(pgt_url, ticket):
+ proxy_callback_good_status = (200, 202, 301, 302, 304)
+ uri = list(urlparse.urlsplit(pgt_url))
+
+ pgt = ProxyGrantingTicket()
+ pgt.serviceTicket = ticket
+ pgt.targetService = pgt_url
+
+ if hasattr(ticket, 'proxyGrantingTicket'):
+ # here we got a proxy ticket! tata!
+ pgt.pgt = ticket.proxyGrantingTicket
+
+ params = {'pgtId': pgt.ticket, 'pgtIou': pgt.pgtiou}
+
+ query = dict(urlparse.parse_qsl(uri[4]))
+ query.update(params)
+
+ uri[3] = urlencode(query)
+
+ try:
+ response = urllib2.urlopen(urlparse.urlunsplit(uri))
+ except urllib2.HTTPError as e:
+ if not e.code in proxy_callback_good_status:
+ logger.debug('Checking Proxy Callback URL {} returned {}. Not issuing PGT.'.format(uri, e.code))
+ return
+ except urllib2.URLError as e:
+ logger.debug('Checking Proxy Callback URL {} raised URLError. Not issuing PGT.'.format(uri))
+ return
+
+ pgt.save()
+ return pgt
+
+
+def _cas2_proxy_success(pt):
+ return HttpResponse(proxy_success(pt))
+
+
+def _cas2_sucess_response(user, pgt=None, proxies=None):
+ return HttpResponse(auth_success_response(user, pgt, proxies), mimetype='text/xml')
+
+
+def _cas2_error_response(code, message=None):
+ return HttpResponse(u'''<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
+ <cas:authenticationFailure code="%(code)s">
+ %(message)s
+ </cas:authenticationFailure>
+ </cas:serviceResponse>''' % {
+ 'code': code,
+ 'message': message if message else dict(ERROR_MESSAGES).get(code)
+ }, mimetype='text/xml')
+
+
+def proxy_success(pt):
+ response = etree.Element(CAS + 'serviceResponse', nsmap=NSMAP)
+ proxySuccess = etree.SubElement(response, CAS + 'proxySuccess')
+ proxyTicket = etree.SubElement(proxySuccess, CAS + 'proxyTicket')
+ proxyTicket.text = pt
+ return unicode(etree.tostring(response, encoding='utf-8'), 'utf-8')
+
+
+def auth_success_response(user, pgt, proxies):
+ response = etree.Element(CAS + 'serviceResponse', nsmap=NSMAP)
+ auth_success = etree.SubElement(response, CAS + 'authenticationSuccess')
+ username = etree.SubElement(auth_success, CAS + 'user')
+ username.text = user.username
+
+ attrs = {}
+ for receiver, custom in signals.cas_collect_custom_attributes.send(sender=auth_success_response, user=user):
+ if custom:
+ attrs.update(custom)
+
+ identifiers = [i for sr, rr in signals.on_cas_collect_histories.send(sender=validate, for_user=user)
+ for i in rr]
+
+ if identifiers:
+ # Singular `identifier`, as that is the name of the element tag(s).
+ attrs['identifier'] = identifiers
+
+ if attrs:
+ formatter = get_callable(settings.CAS_CUSTOM_ATTRIBUTES_FORMATER)
+ formatter(auth_success, attrs)
+
+ if pgt:
+ pgtElement = etree.SubElement(auth_success, CAS + 'proxyGrantingTicket')
+ pgtElement.text = pgt
+
+ if proxies:
+ proxiesElement = etree.SubElement(auth_success, CAS + "proxies")
+ for proxy in proxies:
+ proxyElement = etree.SubElement(proxiesElement, CAS + "proxy")
+ proxyElement.text = proxy
+
+ return unicode(etree.tostring(response, encoding='utf-8'), 'utf-8')
fnp / django-cas-provider.git / blobdiff