X-Git-Url: https://git.mdrn.pl/django-cas-provider.git/blobdiff_plain/cc61c5969227c2d49544997ebbf074541029400b..243a932dd7165b4dbe5d8938f622450b4b7cdaa3:/cas_provider/views.py diff --git a/cas_provider/views.py b/cas_provider/views.py index 6fc19f6..0f53d38 100644 --- a/cas_provider/views.py +++ b/cas_provider/views.py @@ -1,72 +1,405 @@ -from django.http import HttpResponse, HttpResponseForbidden, HttpResponseRedirect -from django.shortcuts import get_object_or_404, render_to_response, get_list_or_404 -from django.core.urlresolvers import reverse -from django.core.exceptions import SuspiciousOperation +import logging +logger = logging.getLogger('cas_provider.views') + +try: + from urllib.error import HTTPError, URLError + from urllib.parse import parse_qsl, urlencode, urlparse, urlsplit, urlunsplit + from urllib.request import urlopen +except ImportError: + from urllib import urlencode + from urllib2 import HTTPError, URLError, urlopen + from urlparse import parse_qsl, urlparse, urlsplit, urlunsplit +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.utils.translation import ugettext as _ 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 django.core.urlresolvers import reverse +from django.utils.translation import ugettext as _ + +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.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'), + ) -from forms import LoginForm -from models import ServiceTicket, LoginTicket -from utils import create_service_ticket -__all__ = ['login', 'validate', 'logout'] +logger = logging.getLogger(__name__) + + +_never_cache = cache_control(no_cache=True, must_revalidate=True) + + +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) -def login(request, template_name='cas/login.html', success_redirect='/accounts/'): 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) - 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': - 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.') + if merge: + form = MergeLoginForm(request.POST, request=request) else: - login_ticket.delete() - user = authenticate(username=username, password=password) - if user is not None: + form = LoginForm(request.POST, request=request) + + if form.is_valid(): + service = form.cleaned_data.get('service', None) + try: + auth_args = dict(username=form.cleaned_data['username'], + 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: + # 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, + username=form.cleaned_data['username'], + ) + if service is not None: + args['service'] = service + args = 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) - 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: # Not a POST... + if merge: + form = MergeLoginForm(initial={'service': service, 'username': request.GET.get('username')}) + 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. Please contact us if you feel it should be enabled again.')) + 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: - errors.append('Incorrect username and/or password.') - form = LoginForm(service) + 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) + 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)) - + + +@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: + logger.exception('Got an exception: %s', e) + else: username = ticket.user.username ticket.delete() - return HttpResponse("yes\n\r%s\n\r" % username) - except: - pass - return HttpResponse("no\n\r\n\r") - -def logout(request, template_name='cas/logout.html'): + + 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") + + +@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)) \ No newline at end of file + 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(ticket.service) + serviceUrl = 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(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(parse_qsl(uri[4])) + query.update(params) + + uri[3] = urlencode(query) + + try: + urlopen(urlunsplit(uri)) + except 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 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), content_type='text/xml') + + +def _cas2_error_response(code, message=None): + return HttpResponse(u''' + + %(message)s + + ''' % { + 'code': code, + 'message': message if message else dict(ERROR_MESSAGES).get(code) + }, content_type='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 etree.tostring(response, encoding='unicode') + + +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 etree.tostring(response, encoding='unicode')