280 lines
10 KiB
Python
280 lines
10 KiB
Python
"""passbook SAML IDP Views"""
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from typing import Optional
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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 HttpRequest, HttpResponse
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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.html import mark_safe
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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, Provider
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from passbook.lib.utils.template import render_to_string
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from passbook.lib.views import bad_request_message
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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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from passbook.providers.saml.processors.types import SAMLResponseParams
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LOGGER = get_logger()
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URL_VALIDATOR = URLValidator(schemes=("http", "https"))
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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: Optional[SAMLProvider] = None
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@property
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def provider(self) -> SAMLProvider:
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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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provider: SAMLProvider = get_object_or_404(
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SAMLProvider, pk=application.provider_id
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)
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self._provider = provider
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return self._provider
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return self._provider
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def _has_access(self) -> bool:
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"""Check if user has access to application"""
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LOGGER.debug(
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"_has_access", user=self.request.user, app=self.provider.application
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)
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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: HttpRequest, *args, **kwargs) -> HttpResponse:
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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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{"title": _("You don't have access to this application"),},
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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: HttpRequest, application: str) -> HttpResponse:
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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 bad_request_message(request, "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-authorize",
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kwargs={"application": application},
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)
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)
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class AuthorizeView(AccessRequiredView):
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"""Ask the user for authorization to continue to the SP.
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Presents a SAML 2.0 Assertion for POSTing back to the Service Provider."""
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def handle_redirect(
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self, params: SAMLResponseParams, skipped_authorization: bool
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) -> HttpResponse:
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"""Handle direct redirect to SP"""
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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,
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skipped_authorization=skipped_authorization,
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).from_http(self.request)
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return render(
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self.request,
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"saml/idp/autosubmit_form.html",
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{
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"url": params.acs_url,
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"attrs": {
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"SAMLResponse": params.saml_response,
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"RelayState": params.relay_state,
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},
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},
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)
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def get(self, request: HttpRequest, application: str) -> HttpResponse:
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"""Handle get request, i.e. render form"""
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# User access gets checked in dispatch
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# Otherwise we generate the IdP initiated session
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try:
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# application.skip_authorization is set so we directly redirect the user
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if self.provider.application.skip_authorization:
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LOGGER.debug("skipping authz", application=self.provider.application)
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return self.post(request, application)
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self.provider.processor.can_handle(request)
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params = self.provider.processor.generate_response()
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return render(
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request,
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"saml/idp/login.html",
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{
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"saml_params": params,
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"provider": self.provider,
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"title": "Authorize Application",
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},
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)
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except exceptions.CannotHandleAssertion as exc:
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LOGGER.error(exc)
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did_you_mean_link = request.build_absolute_uri(
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reverse(
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"passbook_providers_saml:saml-login-initiate",
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kwargs={"application": application},
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)
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)
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did_you_mean_message = (
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f" Did you mean to go <a href='{did_you_mean_link}'>here</a>?"
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)
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return bad_request_message(
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request, mark_safe(str(exc) + did_you_mean_message)
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)
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# pylint: disable=unused-argument
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def post(self, request: HttpRequest, application: str) -> HttpResponse:
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"""Handle post request, return back to ACS"""
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# User access gets checked in dispatch
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# we get here when skip_authorization is True, and after the user accepted
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# the authorization form
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self.provider.processor.can_handle(request)
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saml_params = self.provider.processor.generate_response()
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return self.handle_redirect(saml_params, True)
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@method_decorator(csrf_exempt, name="dispatch")
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class LogoutView(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: HttpRequest, application: str) -> HttpResponse:
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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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@method_decorator(csrf_exempt, name="dispatch")
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class SLOLogout(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: HttpRequest, application: str) -> HttpResponse:
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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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@staticmethod
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def get_metadata(request: HttpRequest, provider: SAMLProvider) -> str:
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"""Return rendered XML Metadata"""
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entity_id = 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": provider.application.slug},
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)
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)
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sso_post_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": provider.application.slug},
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)
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)
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pubkey = strip_pem_header(provider.signing_cert.replace("\r", "")).replace(
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"\n", ""
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)
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subject_format = provider.processor.subject_format
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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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# Currently, the same endpoint accepts POST and REDIRECT
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"sso_post_url": sso_post_url,
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"sso_redirect_url": sso_post_url,
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"subject_format": subject_format,
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}
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return render_to_string("saml/xml/metadata.xml", ctx)
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# pylint: disable=unused-argument
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def get(self, request: HttpRequest, application: str) -> HttpResponse:
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"""Replies with the XML Metadata IDSSODescriptor."""
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try:
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metadata = DescriptorDownloadView.get_metadata(request, self.provider)
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except Provider.application.RelatedObjectDoesNotExist: # pylint: disable=no-member
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return bad_request_message(
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request, "Provider is not assigned to an application."
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)
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else:
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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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def get(self, request: HttpRequest, application: str) -> HttpResponse:
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"""Initiates an IdP-initiated link to a simple SP resource/target URL."""
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return redirect(
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reverse(
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"passbook_providers_saml:saml-login-authorize",
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kwargs={"application": application},
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)
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)
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