X-Git-Url: https://git.mdrn.pl/django-cas-provider.git/blobdiff_plain/93472270e0bb9c9b3d3c54e99e9f13e4d272b367..02f583590f9e4d26747fb699940f197b296d3f09:/cas_provider/views.py?ds=inline

diff --git a/cas_provider/views.py b/cas_provider/views.py
index 41d02fd..a0847b9 100644
--- a/cas_provider/views.py
+++ b/cas_provider/views.py
@@ -1,95 +1,355 @@
-from django.conf import settings
-from django.contrib.auth import login as auth_login, \
-    logout as auth_logout
+import logging
+logger = logging.getLogger('cas_provider.views')
+import urllib
+
+import logging
+from urllib import urlencode
+import urllib2
+import urlparse
+
 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 forms import LoginForm
-from models import ServiceTicket, LoginTicket
+from django.contrib.auth import authenticate
+from django.core.urlresolvers import reverse
+
+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', 'service_validate']
 
+INVALID_TICKET = 'INVALID_TICKET'
+INVALID_SERVICE = 'INVALID_SERVICE'
+INVALID_REQUEST = 'INVALID_REQUEST'
+INTERNAL_ERROR = 'INTERNAL_ERROR'
+
+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__)
+
+
+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)
 
-def login(request, template_name='cas/login.html', \
-                success_redirect=getattr(settings, 'LOGIN_REDIRECT_URL', '/accounts/')):
     service = request.GET.get('service', None)
-    if request.user.is_authenticated():
-        if service is not None:
-            ticket = ServiceTicket.objects.create(service=service, user=request.user)
-            return HttpResponseRedirect(ticket.get_redirect_url())
-        else:
-            return HttpResponseRedirect(success_redirect)
+    if service is not None:
+        # Save the service on the session, for later use if we end up
+        # in one of the more complicated workflows.
+        request.session['service'] = service
+
+    user = request.user
+
+    errors = []
+
     if request.method == 'POST':
-        form = LoginForm(request.POST)
+        if merge:
+            form = MergeLoginForm(request.POST, request=request)
+        else:
+            form = LoginForm(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:
+            service = form.cleaned_data.get('service', None)
+            try:
+                auth_args = dict(username=form.cleaned_data['email'],
+                                 password=form.cleaned_data['password'])
+                if merge:
+                    # We only want to send the merge argument if it's
+                    # True. If it it's False, we want it to propagate
+                    # through the auth backends properly.
+                    auth_args['merge'] = merge
+                user = authenticate(**auth_args)
+            except SameEmailMismatchedPasswords:
+                # Need to merge the accounts?
+                if merge:
+                    # We shouldn't get here...
+                    raise
+                else:
+                    base_url = reverse('cas_provider_merge')
+                    args = dict(
+                        success_redirect=success_redirect,
+                        email=form.cleaned_data['email'],
+                        )
+                    if service is not None:
+                        args['service'] = service
+                    args = urllib.urlencode(args)
+
+                    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 user.is_active:
+                    auth_login(request, user)
+
+    else:  # Not a POST...
+        if merge:
+            form = MergeLoginForm(initial={'service': service, 'email': request.GET.get('email')})
+        else:
+            form = LoginForm(initial={'service': service})
+
+    if user is not None and user.is_authenticated():
+        # We have an authenticated user.
+        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)
+            
+            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 = ServiceTicket.objects.create(service=service, user=user)
-                success_redirect = ticket.get_redirect_url()
-            return HttpResponseRedirect(success_redirect)
-    else:
-        form = LoginForm(initial={
-            'service': service,
-            'lt': LoginTicket.objects.create()
-        })
-    return render_to_response(template_name, {
-        'form': form,
-        'errors': form.get_errors()
-    }, context_instance=RequestContext(request))
+                if 'service' in request.session:
+                    # Don't need this any more.
+                    del request.session['service']
+
+                url = ticket.get_redirect_url()
+                logging.debug('Redirecting to %s', url)
+                return HttpResponseRedirect(url)
+
+    logging.debug('Rendering response on %s, merge is %s', template_name, merge)
+    return render_to_response(template_name, {'form': form, 'errors': errors}, context_instance=RequestContext(request))
 
 
 def validate(request):
-    """Validate ticket via CAS v.1 protocol"""
+    """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:
+            logger.exception('Got an exception: %s', e)
+        else:
             username = ticket.user.username
             ticket.delete()
-            return HttpResponse("yes\r\n%s\r\n" % username)
-        except:
-            pass
-    return HttpResponse("no\r\n\r\n")
 
+            results = signals.on_cas_collect_histories.send(sender=validate, for_email=ticket.user.email)
+            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))
 
-def logout(request, template_name='cas/logout.html'):
+    logger.info('Validation failed.')
+    return HttpResponse("no\n\n")
+    
+
+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))
+
+
+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
+    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)
-    if service is None or ticket_string is None:
-        return _cas2_error_response(u'INVALID_REQUEST', u'Not all required parameters were sent.')
+    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[3] = urlencode(query)
 
     try:
-        ticket = ServiceTicket.objects.get(ticket=ticket_string)
-    except ServiceTicket.DoesNotExist:
-        return _cas2_error_response(u'INVALID_TICKET', u'The provided ticket is invalid.')
+        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
 
-    if settings.CAS_CHECK_SERVICE and ticket.service != service:
-        ticket.delete()
-        return _cas2_error_response('INVALID_SERVICE', u'Service is invalid')
+    pgt.save()
+    return pgt
 
-    username = ticket.user.username
-    ticket.delete()
-    return HttpResponse(u'''<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
-        <cas:authenticationSuccess>
-            <cas:user>%(username)s</cas:user>
-        </cas:authenticationSuccess>
-    </cas:serviceResponse>''' % {'username': username}, mimetype='text/xml')
+
+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):
-    return HttpResponse(u''''<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
-            <cas:authenticationFailure code="%s">
-                %s
+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>''', mimetype='text/xml')
+        </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')