756 lines
28 KiB
Python
756 lines
28 KiB
Python
# ⁻*- coding: utf-8 -*-
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License version 3 for
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# more details.
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#
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# You should have received a copy of the GNU General Public License version 3
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# along with this program; if not, write to the Free Software Foundation, Inc., 51
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# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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# (c) 2015 Valentin Samir
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"""views for the app"""
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from .default_settings import settings
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from django.shortcuts import render, redirect
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from django.http import HttpResponse, HttpResponseRedirect
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from django.contrib import messages
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from django.utils.decorators import method_decorator
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from django.utils.translation import ugettext as _
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from django.utils import timezone
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from django.views.decorators.csrf import csrf_exempt
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from django.views.generic import View
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import requests
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from lxml import etree
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from datetime import timedelta
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import cas_server.utils as utils
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import cas_server.forms as forms
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import cas_server.models as models
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from .models import ServiceTicket, ProxyTicket, ProxyGrantingTicket
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from .models import ServicePattern
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class AttributesMixin(object):
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"""mixin for the attributs methode"""
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# pylint: disable=too-few-public-methods
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def attributes(self):
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"""regerate attributes list for template rendering"""
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attributes = []
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for key, value in self.ticket.attributs.items():
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if isinstance(value, list):
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for elt in value:
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attributes.append((key, elt))
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else:
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attributes.append((key, value))
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return attributes
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class LogoutMixin(object):
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"""destroy CAS session utils"""
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def clean_session_variables(self):
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"""Clean sessions variables"""
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try:
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del self.request.session["authenticated"]
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except KeyError:
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pass
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try:
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del self.request.session["username"]
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except KeyError:
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pass
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try:
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del self.request.session["warn"]
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except KeyError:
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pass
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def logout(self):
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"""effectively destroy CAS session"""
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try:
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user = models.User.objects.get(
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username=self.request.session.get("username"),
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session_key=self.request.session.session_key
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)
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self.clean_session_variables()
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user.logout(self.request)
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user.delete()
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except models.User.DoesNotExist:
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self.clean_session_variables()
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class LogoutView(View, LogoutMixin):
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"""destroy CAS session (logout) view"""
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request = None
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service = None
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def init_get(self, request):
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self.request = request
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self.service = request.GET.get('service')
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self.url = request.GET.get('url')
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def get(self, request, *args, **kwargs):
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"""methode called on GET request on this view"""
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self.init_get(request)
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self.logout()
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# if service is set, redirect to service after logout
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if self.service:
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list(messages.get_messages(request)) # clean messages before leaving the django app
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return HttpResponseRedirect(self.service)
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elif self.url:
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list(messages.get_messages(request)) # clean messages before leaving the django app
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return HttpResponseRedirect(self.url)
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# else redirect to login page
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else:
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if settings.CAS_REDIRECT_TO_LOGIN_AFTER_LOGOUT:
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messages.add_message(request, messages.SUCCESS, _(u'Successfully logout'))
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return redirect("cas_server:login")
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else:
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return render(request, settings.CAS_LOGOUT_TEMPLATE)
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class LoginView(View, LogoutMixin):
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"""credential requestor / acceptor"""
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# pylint: disable=too-many-instance-attributes
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# Nine is reasonable in this case.
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user = None
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form = None
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request = None
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service = None
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renew = None
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gateway = None
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method = None
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renewed = False
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warned = False
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INVALID_LOGIN_TICKET = 1
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USER_LOGIN_OK = 2
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USER_LOGIN_FAILURE = 3
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USER_ALREADY_LOGGED = 4
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USER_AUTHENTICATED = 5
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USER_NOT_AUTHENTICATED = 6
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def init_post(self, request):
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self.request = request
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self.service = request.POST.get('service')
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self.renew = True if request.POST.get('renew') else False
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self.gateway = request.POST.get('gateway')
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self.method = request.POST.get('method')
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def check_lt(self):
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# save LT for later check
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lt_valid = self.request.session.get('lt')
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lt_send = self.request.POST.get('lt')
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# generate a new LT (by posting the LT has been consumed)
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self.request.session['lt'] = utils.gen_lt()
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# check if send LT is valid
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if lt_valid is None or lt_valid != lt_send:
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return False
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else:
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return True
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def post(self, request, *args, **kwargs):
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"""methode called on POST request on this view"""
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self.init_post(request)
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ret = self.process_post()
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if ret == self.INVALID_LOGIN_TICKET:
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messages.add_message(
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self.request,
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messages.ERROR,
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_(u"Invalid login ticket")
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)
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elif ret == self.USER_LOGIN_OK:
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try:
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self.user = models.User.objects.get(
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username=self.request.session['username'],
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session_key=self.request.session.session_key
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)
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self.user.save()
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except models.User.DoesNotExist:
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self.user = models.User.objects.create(
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username=self.request.session['username'],
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session_key=self.request.session.session_key
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)
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self.user.save()
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elif ret == self.USER_LOGIN_FAILURE: # bad user login
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self.logout()
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elif ret == self.USER_ALREADY_LOGGED:
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pass
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else:
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raise EnvironmentError("invalid output for LoginView.process_post")
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return self.common()
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def process_post(self, pytest=False):
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if not self.check_lt():
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values = self.request.POST.copy()
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# if not set a new LT and fail
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values['lt'] = self.request.session['lt']
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self.init_form(values)
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return self.INVALID_LOGIN_TICKET
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elif not self.request.session.get("authenticated") or self.renew:
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self.init_form(self.request.POST)
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if self.form.is_valid():
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self.request.session.set_expiry(0)
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self.request.session["username"] = self.form.cleaned_data['username']
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self.request.session["warn"] = True if self.form.cleaned_data.get("warn") else False
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self.request.session["authenticated"] = True
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self.renewed = True
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self.warned = True
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return self.USER_LOGIN_OK
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else:
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return self.USER_LOGIN_FAILURE
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else:
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return self.USER_ALREADY_LOGGED
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def init_get(self, request):
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self.request = request
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self.service = request.GET.get('service')
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self.renew = True if request.GET.get('renew') else False
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self.gateway = request.GET.get('gateway')
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self.method = request.GET.get('method')
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def get(self, request, *args, **kwargs):
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"""methode called on GET request on this view"""
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self.init_get(request)
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self.process_get()
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return self.common()
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def process_get(self):
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# generate a new LT if none is present
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self.request.session['lt'] = self.request.session.get('lt', utils.gen_lt())
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if not self.request.session.get("authenticated") or self.renew:
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self.init_form()
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return self.USER_NOT_AUTHENTICATED
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return self.USER_AUTHENTICATED
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def init_form(self, values=None):
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self.form = forms.UserCredential(
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values,
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initial={
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'service': self.service,
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'method': self.method,
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'warn': self.request.session.get("warn"),
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'lt': self.request.session['lt']
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}
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)
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def service_login(self):
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"""Perform login agains a service"""
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try:
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# is the service allowed
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service_pattern = ServicePattern.validate(self.service)
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# is the current user allowed on this service
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service_pattern.check_user(self.user)
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# if the user has asked to be warned before any login to a service
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if self.request.session.get("warn", True) and not self.warned:
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messages.add_message(
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self.request,
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messages.WARNING,
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_(u"Authentication has been required by service %(name)s (%(url)s)") %
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{'name': service_pattern.name, 'url': self.service}
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)
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return render(
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self.request,
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settings.CAS_WARN_TEMPLATE,
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{'service_ticket_url': self.user.get_service_url(
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self.service,
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service_pattern,
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renew=self.renew
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)}
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)
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else:
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# redirect, using method ?
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list(messages.get_messages(self.request)) # clean messages before leaving django
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return HttpResponseRedirect(
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self.user.get_service_url(self.service, service_pattern, renew=self.renew)
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)
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except ServicePattern.DoesNotExist:
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messages.add_message(
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self.request,
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messages.ERROR,
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_(u'Service %(url)s non allowed.') % {'url': self.service}
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)
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except models.BadUsername:
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messages.add_message(
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self.request,
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messages.ERROR,
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_(u"Username non allowed")
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)
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except models.BadFilter:
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messages.add_message(
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self.request,
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messages.ERROR,
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_(u"User charateristics non allowed")
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)
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except models.UserFieldNotDefined:
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messages.add_message(
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self.request,
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messages.ERROR,
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_(u"The attribut %(field)s is needed to use"
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u" that service") % {'field': service_pattern.user_field}
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)
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# if gateway is set and auth failed redirect to the service without authentication
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if self.gateway:
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list(messages.get_messages(self.request)) # clean messages before leaving django
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return HttpResponseRedirect(self.service)
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return render(self.request, settings.CAS_LOGGED_TEMPLATE, {'session': self.request.session})
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def authenticated(self):
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"""Processing authenticated users"""
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try:
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self.user = models.User.objects.get(
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username=self.request.session.get("username"),
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session_key=self.request.session.session_key
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)
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except models.User.DoesNotExist:
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self.logout()
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return utils.redirect_params("cas_server:login", params=self.request.GET)
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# if login agains a service is self.requestest
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if self.service:
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return self.service_login()
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else:
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return render(
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self.request,
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settings.CAS_LOGGED_TEMPLATE,
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{'session': self.request.session}
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)
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def not_authenticated(self):
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"""Processing non authenticated users"""
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if self.service:
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try:
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service_pattern = ServicePattern.validate(self.service)
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if self.gateway:
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# clean messages before leaving django
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list(messages.get_messages(self.request))
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return HttpResponseRedirect(self.service)
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if self.request.session.get("authenticated") and self.renew:
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messages.add_message(
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self.request,
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messages.WARNING,
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_(u"Authentication renewal required by service %(name)s (%(url)s).") %
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{'name': service_pattern.name, 'url': self.service}
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)
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else:
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messages.add_message(
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self.request,
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messages.WARNING,
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_(u"Authentication required by service %(name)s (%(url)s).") %
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{'name': service_pattern.name, 'url': self.service}
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)
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except ServicePattern.DoesNotExist:
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messages.add_message(
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self.request,
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messages.ERROR,
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_(u'Service %s non allowed') % self.service
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)
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return render(self.request, settings.CAS_LOGIN_TEMPLATE, {'form': self.form})
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def common(self):
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"""Part execute uppon GET and POST request"""
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# if authenticated and successfully renewed authentication if needed
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if self.request.session.get("authenticated") and (not self.renew or self.renewed):
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return self.authenticated()
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else:
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return self.not_authenticated()
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class Auth(View):
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"""A simple view to validate username/password/service tuple"""
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@method_decorator(csrf_exempt)
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def dispatch(self, request, *args, **kwargs):
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"""dispatch requests based on method GET, POST, ..."""
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return super(Auth, self).dispatch(request, *args, **kwargs)
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@staticmethod
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def post(request):
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"""methode called on GET request on this view"""
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username = request.POST.get('username')
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password = request.POST.get('password')
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service = request.POST.get('service')
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secret = request.POST.get('secret')
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if not settings.CAS_AUTH_SHARED_SECRET:
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return HttpResponse("no\nplease set CAS_AUTH_SHARED_SECRET", content_type="text/plain")
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if secret != settings.CAS_AUTH_SHARED_SECRET:
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return HttpResponse("no\n", content_type="text/plain")
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if not username or not password or not service:
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return HttpResponse("no\n", content_type="text/plain")
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form = forms.UserCredential(
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request.POST,
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initial={
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'service': service,
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'method': 'POST',
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'warn': False
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}
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)
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if form.is_valid():
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try:
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try:
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user = models.User.objects.get(
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username=form.cleaned_data['username'],
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session_key=request.session.session_key
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)
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except models.User.DoesNotExist:
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user = models.User.objects.create(
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username=form.cleaned_data['username'],
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session_key=request.session.session_key
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)
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user.save()
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# is the service allowed
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service_pattern = ServicePattern.validate(service)
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# is the current user allowed on this service
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service_pattern.check_user(user)
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if not request.session.get("authenticated"):
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user.delete()
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return HttpResponse("yes\n", content_type="text/plain")
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except (ServicePattern.DoesNotExist, models.ServicePatternException):
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return HttpResponse("no\n", content_type="text/plain")
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else:
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return HttpResponse("no\n", content_type="text/plain")
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class Validate(View):
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"""service ticket validation"""
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@staticmethod
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def get(request):
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"""methode called on GET request on this view"""
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service = request.GET.get('service')
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ticket = request.GET.get('ticket')
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renew = True if request.GET.get('renew') else False
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if service and ticket:
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try:
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ticket = ServiceTicket.objects.get(
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value=ticket,
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service=service,
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validate=False,
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renew=renew,
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creation__gt=(timezone.now() - timedelta(seconds=ServiceTicket.VALIDITY))
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)
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ticket.validate = True
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ticket.save()
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return HttpResponse("yes\n", content_type="text/plain")
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except ServiceTicket.DoesNotExist:
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return HttpResponse("no\n", content_type="text/plain")
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else:
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return HttpResponse("no\n", content_type="text/plain")
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class ValidateError(Exception):
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"""handle service validation error"""
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def __init__(self, code, msg=""):
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self.code = code
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self.msg = msg
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super(ValidateError, self).__init__(code)
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def __unicode__(self):
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return u"%s" % self.msg
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def render(self, request):
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"""render the error template for the exception"""
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return render(
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request,
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"cas_server/serviceValidateError.xml",
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{'code': self.code, 'msg': self.msg},
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content_type="text/xml; charset=utf-8"
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)
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class ValidateService(View, AttributesMixin):
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"""service ticket validation [CAS 2.0] and [CAS 3.0]"""
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request = None
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service = None
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ticket = None
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pgt_url = None
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renew = None
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allow_proxy_ticket = False
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def get(self, request):
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"""methode called on GET request on this view"""
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self.request = request
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self.service = request.GET.get('service')
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self.ticket = request.GET.get('ticket')
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self.pgt_url = request.GET.get('pgtUrl')
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self.renew = True if request.GET.get('renew') else False
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if not self.service or not self.ticket:
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return ValidateError(
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'INVALID_REQUEST',
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"you must specify a service and a ticket"
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).render(request)
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else:
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try:
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self.ticket, proxies = self.process_ticket()
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params = {
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'username': self.ticket.user.username,
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'attributes': self.attributes(),
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'proxies': proxies
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}
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if (self.ticket.service_pattern.user_field and
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self.ticket.user.attributs.get(self.ticket.service_pattern.user_field)):
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params['username'] = self.ticket.user.attributs.get(
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self.ticket.service_pattern.user_field
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)
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if self.pgt_url and self.pgt_url.startswith("https://"):
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return self.process_pgturl(params)
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else:
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return render(
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request,
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"cas_server/serviceValidate.xml",
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params,
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content_type="text/xml; charset=utf-8"
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)
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except ValidateError as error:
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return error.render(request)
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def process_ticket(self):
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"""fetch the ticket angains the database and check its validity"""
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try:
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proxies = []
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if self.ticket.startswith(ServiceTicket.PREFIX):
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ticket = ServiceTicket.objects.get(
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value=self.ticket,
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validate=False,
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renew=self.renew,
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creation__gt=(timezone.now() - timedelta(seconds=ServiceTicket.VALIDITY))
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)
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|
elif self.allow_proxy_ticket and self.ticket.startswith(ProxyTicket.PREFIX):
|
|
ticket = ProxyTicket.objects.get(
|
|
value=self.ticket,
|
|
validate=False,
|
|
renew=self.renew,
|
|
creation__gt=(timezone.now() - timedelta(seconds=ProxyTicket.VALIDITY))
|
|
)
|
|
for prox in ticket.proxies.all():
|
|
proxies.append(prox.url)
|
|
else:
|
|
raise ValidateError('INVALID_TICKET')
|
|
ticket.validate = True
|
|
ticket.save()
|
|
if ticket.service != self.service:
|
|
raise ValidateError('INVALID_SERVICE')
|
|
return ticket, proxies
|
|
except (ServiceTicket.DoesNotExist, ProxyTicket.DoesNotExist):
|
|
raise ValidateError('INVALID_TICKET', 'ticket not found')
|
|
|
|
def process_pgturl(self, params):
|
|
"""Handle PGT request"""
|
|
try:
|
|
pattern = ServicePattern.validate(self.pgt_url)
|
|
if pattern.proxy_callback:
|
|
proxyid = utils.gen_pgtiou()
|
|
pticket = ProxyGrantingTicket.objects.create(
|
|
user=self.ticket.user,
|
|
service=self.pgt_url,
|
|
service_pattern=pattern,
|
|
single_log_out=pattern.single_log_out
|
|
)
|
|
url = utils.update_url(self.pgt_url, {'pgtIou': proxyid, 'pgtId': pticket.value})
|
|
try:
|
|
ret = requests.get(url, verify=settings.CAS_PROXY_CA_CERTIFICATE_PATH)
|
|
if ret.status_code == 200:
|
|
params['proxyGrantingTicket'] = proxyid
|
|
else:
|
|
pticket.delete()
|
|
return render(
|
|
self.request,
|
|
"cas_server/serviceValidate.xml",
|
|
params,
|
|
content_type="text/xml; charset=utf-8"
|
|
)
|
|
except requests.exceptions.SSLError as error:
|
|
error = utils.unpack_nested_exception(error)
|
|
raise ValidateError('INVALID_PROXY_CALLBACK', str(error))
|
|
else:
|
|
raise ValidateError(
|
|
'INVALID_PROXY_CALLBACK',
|
|
"callback url not allowed by configuration"
|
|
)
|
|
except ServicePattern.DoesNotExist:
|
|
raise ValidateError(
|
|
'INVALID_PROXY_CALLBACK',
|
|
'callback url not allowed by configuration'
|
|
)
|
|
|
|
|
|
class Proxy(View):
|
|
"""proxy ticket service"""
|
|
|
|
request = None
|
|
pgt = None
|
|
target_service = None
|
|
|
|
def get(self, request):
|
|
"""methode called on GET request on this view"""
|
|
self.request = request
|
|
self.pgt = request.GET.get('pgt')
|
|
self.target_service = request.GET.get('targetService')
|
|
try:
|
|
if self.pgt and self.target_service:
|
|
return self.process_proxy()
|
|
else:
|
|
raise ValidateError(
|
|
'INVALID_REQUEST',
|
|
"you must specify and pgt and targetService"
|
|
)
|
|
except ValidateError as error:
|
|
return error.render(request)
|
|
|
|
def process_proxy(self):
|
|
"""handle PT request"""
|
|
try:
|
|
# is the target service allowed
|
|
pattern = ServicePattern.validate(self.target_service)
|
|
if not pattern.proxy:
|
|
raise ValidateError(
|
|
'UNAUTHORIZED_SERVICE',
|
|
'the service do not allow proxy ticket'
|
|
)
|
|
# is the proxy granting ticket valid
|
|
ticket = ProxyGrantingTicket.objects.get(
|
|
value=self.pgt,
|
|
creation__gt=(timezone.now() - timedelta(seconds=ProxyGrantingTicket.VALIDITY))
|
|
)
|
|
# is the pgt user allowed on the target service
|
|
pattern.check_user(ticket.user)
|
|
pticket = ticket.user.get_ticket(
|
|
ProxyTicket,
|
|
self.target_service,
|
|
pattern,
|
|
renew=False)
|
|
models.Proxy.objects.create(proxy_ticket=pticket, url=ticket.service)
|
|
return render(
|
|
self.request,
|
|
"cas_server/proxy.xml",
|
|
{'ticket': pticket.value},
|
|
content_type="text/xml; charset=utf-8"
|
|
)
|
|
except ProxyGrantingTicket.DoesNotExist:
|
|
raise ValidateError('INVALID_TICKET', 'PGT not found')
|
|
except ServicePattern.DoesNotExist:
|
|
raise ValidateError('UNAUTHORIZED_SERVICE')
|
|
except (models.BadUsername, models.BadFilter, models.UserFieldNotDefined):
|
|
raise ValidateError(
|
|
'UNAUTHORIZED_USER',
|
|
'%s not allowed on %s' % (ticket.user, self.target_service)
|
|
)
|
|
|
|
|
|
class SamlValidateError(Exception):
|
|
"""handle saml validation error"""
|
|
def __init__(self, code, msg=""):
|
|
self.code = code
|
|
self.msg = msg
|
|
super(SamlValidateError, self).__init__(code)
|
|
|
|
def __unicode__(self):
|
|
return u"%s" % self.msg
|
|
|
|
def render(self, request):
|
|
"""render the error template for the exception"""
|
|
return render(
|
|
request,
|
|
"cas_server/samlValidateError.xml",
|
|
{
|
|
'code': self.code,
|
|
'msg': self.msg,
|
|
'IssueInstant': timezone.now().isoformat(),
|
|
'ResponseID': utils.gen_saml_id()
|
|
},
|
|
content_type="text/xml; charset=utf-8"
|
|
)
|
|
|
|
|
|
class SamlValidate(View, AttributesMixin):
|
|
"""SAML ticket validation"""
|
|
request = None
|
|
target = None
|
|
ticket = None
|
|
root = None
|
|
|
|
@method_decorator(csrf_exempt)
|
|
def dispatch(self, request, *args, **kwargs):
|
|
"""dispatch requests based on method GET, POST, ..."""
|
|
return super(SamlValidate, self).dispatch(request, *args, **kwargs)
|
|
|
|
def post(self, request):
|
|
"""methode called on POST request on this view"""
|
|
self.request = request
|
|
self.target = request.GET.get('TARGET')
|
|
self.root = etree.fromstring(request.body)
|
|
try:
|
|
self.ticket = self.process_ticket()
|
|
expire_instant = (self.ticket.creation +
|
|
timedelta(seconds=self.ticket.VALIDITY)).isoformat()
|
|
attributes = self.attributes()
|
|
params = {
|
|
'IssueInstant': timezone.now().isoformat(),
|
|
'expireInstant': expire_instant,
|
|
'Recipient': self.target,
|
|
'ResponseID': utils.gen_saml_id(),
|
|
'username': self.ticket.user.username,
|
|
'attributes': attributes
|
|
}
|
|
if self.ticket.service_pattern.user_field and \
|
|
self.ticket.user.attributs.get(self.ticket.service_pattern.user_field):
|
|
params['username'] = self.ticket.user.attributs.get(
|
|
self.ticket.service_pattern.user_field
|
|
)
|
|
return render(
|
|
request,
|
|
"cas_server/samlValidate.xml",
|
|
params,
|
|
content_type="text/xml; charset=utf-8"
|
|
)
|
|
except SamlValidateError as error:
|
|
return error.render(request)
|
|
|
|
def process_ticket(self):
|
|
"""validate ticket from SAML XML body"""
|
|
try:
|
|
auth_req = self.root.getchildren()[1].getchildren()[0]
|
|
ticket = auth_req.getchildren()[0].text
|
|
if ticket.startswith(ServiceTicket.PREFIX):
|
|
ticket = ServiceTicket.objects.get(
|
|
value=ticket,
|
|
validate=False,
|
|
creation__gt=(timezone.now() - timedelta(seconds=ServiceTicket.VALIDITY))
|
|
)
|
|
elif ticket.startswith(ProxyTicket.PREFIX):
|
|
ticket = ProxyTicket.objects.get(
|
|
value=ticket,
|
|
validate=False,
|
|
creation__gt=(timezone.now() - timedelta(seconds=ProxyTicket.VALIDITY))
|
|
)
|
|
else:
|
|
raise SamlValidateError(
|
|
'AuthnFailed',
|
|
'ticket should begin with PT- or ST-'
|
|
)
|
|
ticket.validate = True
|
|
ticket.save()
|
|
if ticket.service != self.target:
|
|
raise SamlValidateError(
|
|
'AuthnFailed',
|
|
'TARGET do not match ticket service'
|
|
)
|
|
return ticket
|
|
except (IndexError, KeyError):
|
|
raise SamlValidateError('VersionMismatch')
|
|
except (ServiceTicket.DoesNotExist, ProxyTicket.DoesNotExist):
|
|
raise SamlValidateError('AuthnFailed', 'ticket not found')
|