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using south for db migrations
[django-cas-provider.git] / cas_provider / views.py
diff --git a/cas_provider/views.py b/cas_provider/views.py
index c2b3d58..2769e52 100644 (file)
--- a/cas_provider/views.py
+++ b/cas_provider/views.py
@@ -1,94 +1,263 @@
-from django.http import HttpResponse, HttpResponseForbidden, HttpResponseRedirect
+from lxml import etree
+from urllib import urlencode
+import urllib2
+import urlparse
+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.http import HttpResponse, HttpResponseRedirect
 from django.shortcuts import render_to_response
 from django.template import RequestContext
 from django.shortcuts import render_to_response
 from django.template import RequestContext
-from django.contrib.auth.models import User
-from django.contrib.auth import authenticate
-from django.contrib.auth import login as auth_login, logout as auth_logout
+from cas_provider.attribute_formatters import NSMAP, CAS
+from cas_provider.models import ProxyGrantingTicket, ProxyTicket
+from forms import LoginForm
+from models import ServiceTicket, LoginTicket
+
+
+__all__ = ['login', 'validate', 'logout', 'service_validate']
+
+INVALID_TICKET = 'INVALID_TICKET'
+INVALID_SERVICE = 'INVALID_SERVICE'
+INVALID_REQUEST = 'INVALID_REQUEST'
+INTERNAL_ERROR = 'INTERNAL_ERROR'
 
 
-from cas_provider.forms import LoginForm
-from cas_provider.models import ServiceTicket, LoginTicket, auth_success_response
-from cas_provider.utils import create_service_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'),
+    )
 
 
-__all__ = ['login', 'validate', 'service_validate', 'logout']
 
 
-def login(request, template_name='cas/login.html', success_redirect='/accounts/'):
+def login(request, template_name='cas/login.html',\
+          success_redirect=settings.LOGIN_REDIRECT_URL,
+          warn_template_name='cas/warn.html',
+          form_class=LoginForm):
     service = request.GET.get('service', None)
     if request.user.is_authenticated():
         if service is not None:
     service = request.GET.get('service', None)
     if request.user.is_authenticated():
         if service is not None:
-            ticket = create_service_ticket(request.user, service)
-            if service.find('?') == -1:
-                return HttpResponseRedirect(service + '?ticket=' + ticket.ticket)
-            else:
-                return HttpResponseRedirect(service + '&ticket=' + ticket.ticket)
+            if request.GET.get('warn', False):
+                return render_to_response(warn_template_name, {
+                    'service': service,
+                    'warn': False
+                }, context_instance=RequestContext(request))
+            ticket = ServiceTicket.objects.create(service=service, user=request.user)
+            return HttpResponseRedirect(ticket.get_redirect_url())
         else:
             return HttpResponseRedirect(success_redirect)
         else:
             return HttpResponseRedirect(success_redirect)
-    errors = []
     if request.method == 'POST':
     if request.method == 'POST':
-        username = request.POST.get('username', None)
-        password = request.POST.get('password', None)
-        service = request.POST.get('service', None)
-        lt = request.POST.get('lt', None)
-        
-        try:
-            login_ticket = LoginTicket.objects.get(ticket=lt)
-        except:
-            errors.append('Login ticket expired. Please try again.')
-        else:
-            login_ticket.delete()
-            user = authenticate(username=username, password=password)
-            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(service + '?ticket=' + ticket.ticket)
-                    else:
-                        return HttpResponseRedirect(success_redirect)
-                else:
-                    errors.append('This account is disabled.')
-            else:
-                    errors.append('Incorrect username and/or password.')
-    form = LoginForm(service)
-    return render_to_response(template_name, {'form': form, 'errors': errors}, context_instance=RequestContext(request))
-    
+        form = form_class(data=request.POST, request=request)
+        if form.is_valid():
+            user = form.get_user()
+            auth_login(request, user)
+            service = form.cleaned_data.get('service')
+            if service is not None:
+                ticket = ServiceTicket.objects.create(service=service, user=user)
+                success_redirect = ticket.get_redirect_url()
+            return HttpResponseRedirect(success_redirect)
+    else:
+        form = form_class(request=request, initial={
+            'service': service,
+            'lt': LoginTicket.objects.create()
+        })
+    if hasattr(request, 'session') and hasattr(request.session, 'set_test_cookie'):
+        request.session.set_test_cookie()
+    return render_to_response(template_name, {
+        'form': form,
+        'errors': form.get_errors() if hasattr(form, 'get_errors') else None,
+        }, context_instance=RequestContext(request))
+
+
 def validate(request):
 def validate(request):
+    """Validate ticket via CAS v.1 protocol"""
     service = request.GET.get('service', None)
     ticket_string = request.GET.get('ticket', None)
     if service is not None and ticket_string is not None:
     service = request.GET.get('service', None)
     ticket_string = request.GET.get('ticket', None)
     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)
         try:
             ticket = ServiceTicket.objects.get(ticket=ticket_string)
+            assert ticket.service == service
             username = ticket.user.username
             username = ticket.user.username
-            ticket.delete()
             return HttpResponse("yes\n%s\n" % username)
         except:
             pass
     return HttpResponse("no\n\n")
 
             return HttpResponse("yes\n%s\n" % username)
         except:
             pass
     return HttpResponse("no\n\n")
 
-def service_validate(request):
-    service = request.GET.get('service', None)
-    ticket_string = request.GET.get('ticket', None)
-    if service is None or ticket_string is None:
-        return HttpResponse('''<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
-            <cas:authenticationFailure code="INVALID_REQUEST">
-                Not all required parameters were sent.
-            </cas:authenticationFailure>
-        </cas:serviceResponse>''', mimetype='text/xml')
-    
-    try:
-        ticket = ServiceTicket.objects.get(ticket=ticket_string)
-        ticket.delete()
-        return HttpResponse(auth_success_response(ticket.user), mimetype='text/xml')
-    except ServiceTicket.DoesNotExist:
-        return HttpResponse('''<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
-            <cas:authenticationFailure code="INVALID_TICKET">
-                The provided ticket is invalid.
-            </cas:authenticationFailure>
-        </cas:serviceResponse>''', mimetype='text/xml')
 
 
-def logout(request, template_name='cas/logout.html', auto_redirect=False):
+def logout(request, template_name='cas/logout.html',
+           auto_redirect=settings.CAS_AUTO_REDIRECT_AFTER_LOGOUT):
     url = request.GET.get('url', None)
     if request.user.is_authenticated():
     url = request.GET.get('url', None)
     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)
         auth_logout(request)
         if url and auto_redirect:
             return HttpResponseRedirect(url)
-    return render_to_response(template_name, {'url': url}, context_instance=RequestContext(request))
+    return render_to_response(template_name, {'url': url},
+        context_instance=RequestContext(request))
+
+
+def proxy(request):
+    targetService = request.GET['targetService']
+    pgtiou = request.GET['pgt']
+
+    try:
+        proxyGrantingTicket = ProxyGrantingTicket.objects.get(pgtiou=pgtiou)
+    except ProxyGrantingTicket.DoesNotExist:
+        return _cas2_error_response(INVALID_TICKET)
+
+    if not proxyGrantingTicket.targetService == targetService:
+        return _cas2_error_response(INVALID_SERVICE,
+            "The PGT was issued for %(original)s but the PT was requested for %(but)s" % dict(
+                original=proxyGrantingTicket.targetService, but=targetService))
+
+    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)
+
+    if ticket.service != service:
+        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
+    return _cas2_sucess_response(user, pgtIouId, proxies)
+
+
+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)
+
+
+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[4] = urlencode(query)
+
+    try:
+        response = urllib2.urlopen(urlparse.urlunsplit(uri))
+    except urllib2.HTTPError, e:
+        if not e.code in proxy_callback_good_status:
+            return
+    except urllib2.URLError, e:
+        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
+
+    if settings.CAS_CUSTOM_ATTRIBUTES_CALLBACK:
+        callback = get_callable(settings.CAS_CUSTOM_ATTRIBUTES_CALLBACK)
+        attrs = callback(user)
+        if len(attrs) > 0:
+            formater = get_callable(settings.CAS_CUSTOM_ATTRIBUTES_FORMATER)
+            formater(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')
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