242 lines
9.6 KiB
Python
242 lines
9.6 KiB
Python
"""passbook SAML IDP Views"""
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from typing import Optional
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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
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from django.utils.decorators import method_decorator
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from django.utils.http import urlencode
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from django.utils.translation import gettext_lazy 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 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.flows.models import in_memory_stage
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from passbook.flows.planner import (
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PLAN_CONTEXT_APPLICATION,
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PLAN_CONTEXT_SSO,
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FlowPlanner,
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)
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from passbook.flows.stage import StageView
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from passbook.flows.views import SESSION_KEY_PLAN
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from passbook.lib.utils.urls import redirect_with_qs
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from passbook.lib.views import bad_request_message
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from passbook.policies.mixins import PolicyAccessMixin
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from passbook.providers.saml.exceptions import CannotHandleAssertion
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from passbook.providers.saml.models import SAMLBindings, SAMLProvider
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from passbook.providers.saml.processors.assertion import AssertionProcessor
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from passbook.providers.saml.processors.metadata import MetadataProcessor
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from passbook.providers.saml.processors.request_parser import (
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AuthNRequest,
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AuthNRequestParser,
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)
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from passbook.providers.saml.utils.encoding import deflate_and_base64_encode, nice64
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from passbook.stages.consent.stage import PLAN_CONTEXT_CONSENT_TEMPLATE
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LOGGER = get_logger()
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URL_VALIDATOR = URLValidator(schemes=("http", "https"))
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REQUEST_KEY_SAML_REQUEST = "SAMLRequest"
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REQUEST_KEY_SAML_SIGNATURE = "Signature"
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REQUEST_KEY_SAML_SIG_ALG = "SigAlg"
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REQUEST_KEY_SAML_RESPONSE = "SAMLResponse"
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REQUEST_KEY_RELAY_STATE = "RelayState"
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SESSION_KEY_AUTH_N_REQUEST = "authn_request"
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class SAMLSSOView(PolicyAccessMixin, View):
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""""SAML SSO Base View, which plans a flow and injects our final stage.
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Calls get/post handler."""
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application: Application
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provider: SAMLProvider
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def dispatch(
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self, request: HttpRequest, *args, application_slug: str, **kwargs
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) -> HttpResponse:
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self.application = get_object_or_404(Application, slug=application_slug)
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self.provider: SAMLProvider = get_object_or_404(
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SAMLProvider, pk=self.application.provider_id
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)
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if not request.user.is_authenticated:
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return self.handle_no_permission(self.application)
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if not self.user_has_access(self.application).passing:
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return self.handle_no_permission_authorized()
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# Call the method handler, which checks the SAML Request
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method_response = super().dispatch(request, *args, application_slug, **kwargs)
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if method_response:
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return method_response
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# Regardless, we start the planner and return to it
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planner = FlowPlanner(self.provider.authorization_flow)
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planner.allow_empty_flows = True
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plan = planner.plan(
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self.request,
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{
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PLAN_CONTEXT_SSO: True,
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PLAN_CONTEXT_APPLICATION: self.application,
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PLAN_CONTEXT_CONSENT_TEMPLATE: "providers/saml/consent.html",
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},
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)
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plan.append(in_memory_stage(SAMLFlowFinalView))
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self.request.session[SESSION_KEY_PLAN] = plan
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return redirect_with_qs(
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"passbook_flows:flow-executor-shell",
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self.request.GET,
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flow_slug=self.provider.authorization_flow.slug,
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)
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class SAMLSSOBindingRedirectView(SAMLSSOView):
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"""SAML Handler for SSO/Redirect bindings, which are sent via GET"""
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# pylint: disable=unused-argument
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def get( # lgtm [py/similar-function]
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self, request: HttpRequest, application_slug: str
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) -> Optional[HttpResponse]:
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"""Handle REDIRECT bindings"""
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if REQUEST_KEY_SAML_REQUEST not in request.GET:
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LOGGER.info("handle_saml_request: SAML payload missing")
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return bad_request_message(
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self.request, "The SAML request payload is missing."
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)
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try:
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auth_n_request = AuthNRequestParser(self.provider).parse_detached(
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request.GET[REQUEST_KEY_SAML_REQUEST],
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request.GET.get(REQUEST_KEY_RELAY_STATE),
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request.GET.get(REQUEST_KEY_SAML_SIGNATURE),
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request.GET.get(REQUEST_KEY_SAML_SIG_ALG),
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)
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self.request.session[SESSION_KEY_AUTH_N_REQUEST] = auth_n_request
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except CannotHandleAssertion as exc:
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LOGGER.info(exc)
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return bad_request_message(self.request, str(exc))
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return None
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@method_decorator(csrf_exempt, name="dispatch")
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class SAMLSSOBindingPOSTView(SAMLSSOView):
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"""SAML Handler for SSO/POST bindings"""
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# pylint: disable=unused-argument
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def post(
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self, request: HttpRequest, application_slug: str
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) -> Optional[HttpResponse]:
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"""Handle POST bindings"""
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if REQUEST_KEY_SAML_REQUEST not in request.POST:
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LOGGER.info("handle_saml_request: SAML payload missing")
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return bad_request_message(
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self.request, "The SAML request payload is missing."
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)
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try:
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auth_n_request = AuthNRequestParser(self.provider).parse(
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request.POST[REQUEST_KEY_SAML_REQUEST],
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request.POST.get(REQUEST_KEY_RELAY_STATE),
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)
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self.request.session[SESSION_KEY_AUTH_N_REQUEST] = auth_n_request
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except CannotHandleAssertion as exc:
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LOGGER.info(exc)
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return bad_request_message(self.request, str(exc))
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return None
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class SAMLSSOBindingInitView(SAMLSSOView):
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"""SAML Handler for for IdP Initiated login flows"""
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# pylint: disable=unused-argument
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def get(
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self, request: HttpRequest, application_slug: str
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) -> Optional[HttpResponse]:
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"""Create SAML Response from scratch"""
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LOGGER.debug(
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"handle_saml_no_request: No SAML Request, using IdP-initiated flow."
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)
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auth_n_request = AuthNRequestParser(self.provider).idp_initiated()
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self.request.session[SESSION_KEY_AUTH_N_REQUEST] = auth_n_request
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# This View doesn't have a URL on purpose, as its called by the FlowExecutor
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class SAMLFlowFinalView(StageView):
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"""View used by FlowExecutor after all stages have passed. Logs the authorization,
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and redirects to the SP (if REDIRECT is configured) or shows and auto-submit for
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(if POST is configured)."""
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def get(self, request: HttpRequest, *args, **kwargs) -> HttpResponse:
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application: Application = self.executor.plan.context[PLAN_CONTEXT_APPLICATION]
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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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# Log Application Authorization
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Event.new(
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EventAction.AUTHORIZE_APPLICATION,
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authorized_application=application,
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flow=self.executor.plan.flow_pk,
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).from_http(self.request)
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if SESSION_KEY_AUTH_N_REQUEST not in self.request.session:
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return self.executor.stage_invalid()
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auth_n_request: AuthNRequest = self.request.session.pop(
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SESSION_KEY_AUTH_N_REQUEST
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)
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response = AssertionProcessor(
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provider, request, auth_n_request
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).build_response()
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if provider.sp_binding == SAMLBindings.POST:
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form_attrs = {
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"ACSUrl": provider.acs_url,
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REQUEST_KEY_SAML_RESPONSE: nice64(response),
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}
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if auth_n_request.relay_state:
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form_attrs[REQUEST_KEY_RELAY_STATE] = auth_n_request.relay_state
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return render(
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self.request,
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"generic/autosubmit_form.html",
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{
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"url": provider.acs_url,
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"title": _("Redirecting to %(app)s..." % {"app": application.name}),
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"attrs": form_attrs,
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},
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)
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if provider.sp_binding == SAMLBindings.REDIRECT:
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url_args = {
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REQUEST_KEY_SAML_RESPONSE: deflate_and_base64_encode(response),
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}
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if auth_n_request.relay_state:
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url_args[REQUEST_KEY_RELAY_STATE] = auth_n_request.relay_state
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querystring = urlencode(url_args)
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return redirect(f"{provider.acs_url}?{querystring}")
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return bad_request_message(request, "Invalid sp_binding specified")
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class DescriptorDownloadView(View):
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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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return MetadataProcessor(provider, request).build_entity_descriptor()
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def get(self, request: HttpRequest, application_slug: str) -> HttpResponse:
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"""Replies with the XML Metadata IDSSODescriptor."""
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application = get_object_or_404(Application, slug=application_slug)
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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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try:
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metadata = DescriptorDownloadView.get_metadata(request, 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[
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"Content-Disposition"
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] = f'attachment; filename="{provider.name}_passbook_meta.xml"'
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return response
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