235 lines
9.0 KiB
Python
235 lines
9.0 KiB
Python
"""passbook SAML IDP Views"""
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from django.contrib.auth import logout
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from django.contrib.auth.mixins import AccessMixin
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from django.core.exceptions import ValidationError
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from django.core.validators import URLValidator
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from django.http import HttpResponse, HttpResponseBadRequest
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from django.shortcuts import get_object_or_404, redirect, render, reverse
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from django.utils.datastructures import MultiValueDictKeyError
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from django.utils.decorators import method_decorator
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from django.utils.translation import gettext as _
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from django.views import View
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from django.views.decorators.csrf import csrf_exempt
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from signxml.util import strip_pem_header
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from structlog import get_logger
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from passbook.audit.models import AuditEntry
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from passbook.core.models import Application
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from passbook.lib.mixins import CSRFExemptMixin
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from passbook.lib.utils.template import render_to_string
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from passbook.policies.engine import PolicyEngine
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from passbook.providers.saml import exceptions
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from passbook.providers.saml.models import SAMLProvider
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LOGGER = get_logger()
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URL_VALIDATOR = URLValidator(schemes=('http', 'https'))
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def _generate_response(request, provider: SAMLProvider):
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"""Generate a SAML response using processor_instance and return it in the proper Django
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response."""
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try:
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provider.processor.init_deep_link(request, '')
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ctx = provider.processor.generate_response()
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ctx['remote'] = provider
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ctx['is_login'] = True
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except exceptions.UserNotAuthorized:
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return render(request, 'saml/idp/invalid_user.html')
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return render(request, 'saml/idp/login.html', ctx)
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def render_xml(request, template, ctx):
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"""Render template with content_type application/xml"""
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return render(request, template, context=ctx, content_type="application/xml")
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class AccessRequiredView(AccessMixin, View):
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"""Mixin class for Views using a provider instance"""
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_provider = None
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@property
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def provider(self):
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"""Get provider instance"""
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if not self._provider:
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application = get_object_or_404(Application, slug=self.kwargs['application'])
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self._provider = get_object_or_404(SAMLProvider, pk=application.provider_id)
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return self._provider
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def _has_access(self):
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"""Check if user has access to application"""
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policy_engine = PolicyEngine(self.provider.application.policies.all())
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policy_engine.for_user(self.request.user).with_request(self.request).build()
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return policy_engine.passing
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def dispatch(self, request, *args, **kwargs):
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if not request.user.is_authenticated:
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return self.handle_no_permission()
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if not self._has_access():
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return render(request, 'login/denied.html', {
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'title': _("You don't have access to this application"),
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'is_login': True
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})
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return super().dispatch(request, *args, **kwargs)
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class LoginBeginView(AccessRequiredView):
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"""Receives a SAML 2.0 AuthnRequest from a Service Provider and
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stores it in the session prior to enforcing login."""
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@method_decorator(csrf_exempt)
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def dispatch(self, request, application):
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if request.method == 'POST':
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source = request.POST
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else:
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source = request.GET
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# Store these values now, because Django's login cycle won't preserve them.
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try:
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request.session['SAMLRequest'] = source['SAMLRequest']
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except (KeyError, MultiValueDictKeyError):
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return HttpResponseBadRequest('the SAML request payload is missing')
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request.session['RelayState'] = source.get('RelayState', '')
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return redirect(reverse('passbook_providers_saml:saml-login-process', kwargs={
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'application': application
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}))
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class RedirectToSPView(AccessRequiredView):
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"""Return autosubmit form"""
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def get(self, request, acs_url, saml_response, relay_state):
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"""Return autosubmit form"""
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return render(request, 'core/autosubmit_form.html', {
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'url': acs_url,
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'attrs': {
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'SAMLResponse': saml_response,
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'RelayState': relay_state
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}
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})
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class LoginProcessView(AccessRequiredView):
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"""Processor-based login continuation.
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Presents a SAML 2.0 Assertion for POSTing back to the Service Provider."""
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def get(self, request, application):
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"""Handle get request, i.e. render form"""
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LOGGER.debug("Request: %s", request)
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# Check if user has access
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if self.provider.application.skip_authorization:
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ctx = self.provider.processor.generate_response()
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# Log Application Authorization
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AuditEntry.create(
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action=AuditEntry.ACTION_AUTHORIZE_APPLICATION,
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request=request,
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app=self.provider.application.name,
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skipped_authorization=True)
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return RedirectToSPView.as_view()(
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request=request,
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acs_url=ctx['acs_url'],
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saml_response=ctx['saml_response'],
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relay_state=ctx['relay_state'])
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try:
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full_res = _generate_response(request, self.provider)
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return full_res
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except exceptions.CannotHandleAssertion as exc:
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LOGGER.debug(exc)
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def post(self, request, application):
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"""Handle post request, return back to ACS"""
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LOGGER.debug("Request: %s", request)
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# Check if user has access
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if request.POST.get('ACSUrl', None):
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# User accepted request
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AuditEntry.create(
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action=AuditEntry.ACTION_AUTHORIZE_APPLICATION,
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request=request,
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app=self.provider.application.name,
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skipped_authorization=False)
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return RedirectToSPView.as_view()(
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request=request,
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acs_url=request.POST.get('ACSUrl'),
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saml_response=request.POST.get('SAMLResponse'),
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relay_state=request.POST.get('RelayState'))
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try:
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full_res = _generate_response(request, self.provider)
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return full_res
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except exceptions.CannotHandleAssertion as exc:
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LOGGER.debug(exc)
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class LogoutView(CSRFExemptMixin, AccessRequiredView):
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"""Allows a non-SAML 2.0 URL to log out the user and
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returns a standard logged-out page. (SalesForce and others use this method,
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though it's technically not SAML 2.0)."""
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def get(self, request, application):
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"""Perform logout"""
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logout(request)
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redirect_url = request.GET.get('redirect_to', '')
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try:
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URL_VALIDATOR(redirect_url)
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except ValidationError:
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pass
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else:
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return redirect(redirect_url)
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return render(request, 'saml/idp/logged_out.html')
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class SLOLogout(CSRFExemptMixin, AccessRequiredView):
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"""Receives a SAML 2.0 LogoutRequest from a Service Provider,
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logs out the user and returns a standard logged-out page."""
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def post(self, request, application):
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"""Perform logout"""
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request.session['SAMLRequest'] = request.POST['SAMLRequest']
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# TODO: Parse SAML LogoutRequest from POST data, similar to login_process().
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# TODO: Modify the base processor to handle logouts?
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# TODO: Combine this with login_process(), since they are so very similar?
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# TODO: Format a LogoutResponse and return it to the browser.
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# XXX: For now, simply log out without validating the request.
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logout(request)
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return render(request, 'saml/idp/logged_out.html')
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class DescriptorDownloadView(AccessRequiredView):
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"""Replies with the XML Metadata IDSSODescriptor."""
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def get(self, request, application):
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"""Replies with the XML Metadata IDSSODescriptor."""
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entity_id = self.provider.issuer
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slo_url = request.build_absolute_uri(reverse('passbook_providers_saml:saml-logout', kwargs={
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'application': application
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}))
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sso_url = request.build_absolute_uri(reverse('passbook_providers_saml:saml-login', kwargs={
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'application': application
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}))
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pubkey = strip_pem_header(self.provider.signing_cert.replace('\r', '')).replace('\n', '')
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ctx = {
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'entity_id': entity_id,
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'cert_public_key': pubkey,
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'slo_url': slo_url,
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'sso_url': sso_url
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}
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metadata = render_to_string('saml/xml/metadata.xml', ctx)
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response = HttpResponse(metadata, content_type='application/xml')
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response['Content-Disposition'] = ('attachment; filename="'
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'%s_passbook_meta.xml"' % self.provider.name)
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return response
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class InitiateLoginView(AccessRequiredView):
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"""IdP-initiated Login"""
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def get(self, request, application):
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"""Initiates an IdP-initiated link to a simple SP resource/target URL."""
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self.provider.processor.init_deep_link(request, '')
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self.provider.processor.is_idp_initiated = True
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return _generate_response(request, self.provider)
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