263 lines
9.5 KiB
Python
263 lines
9.5 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 Event, EventAction
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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(
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Application, slug=self.kwargs["application"]
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)
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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(
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self.provider.application.policies.all(), self.request.user, self.request
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)
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policy_engine.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(
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request,
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"login/denied.html",
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{
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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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)
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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(
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reverse(
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"passbook_providers_saml:saml-login-process",
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kwargs={"application": application},
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)
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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(
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request,
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"core/autosubmit_form.html",
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{
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"url": acs_url,
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"attrs": {"SAMLResponse": saml_response, "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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# pylint: disable=unused-argument
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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("SAMLLoginProcessView", request=request, method="get")
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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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Event.new(
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EventAction.AUTHORIZE_APPLICATION,
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authorized_application=self.provider.application.pk,
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skipped_authorization=True,
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).from_http(request)
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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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)
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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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# pylint: disable=unused-argument
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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("SAMLLoginProcessView", request=request, method="post")
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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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Event.new(
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EventAction.AUTHORIZE_APPLICATION,
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authorized_application=self.provider.application.pk,
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skipped_authorization=False,
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).from_http(request)
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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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)
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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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# pylint: disable=unused-argument
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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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# pylint: disable=unused-argument
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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(
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reverse(
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"passbook_providers_saml:saml-logout",
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kwargs={"application": application},
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)
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)
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sso_url = request.build_absolute_uri(
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reverse(
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"passbook_providers_saml:saml-login",
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kwargs={"application": application},
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)
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)
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pubkey = strip_pem_header(self.provider.signing_cert.replace("\r", "")).replace(
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"\n", ""
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)
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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"] = (
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'attachment; filename="' '%s_passbook_meta.xml"' % self.provider.name
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)
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return response
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class InitiateLoginView(AccessRequiredView):
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"""IdP-initiated Login"""
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# pylint: disable=unused-argument
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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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