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