282 lines
11 KiB
Python
282 lines
11 KiB
Python
"""passbook SAML IDP Views"""
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from typing import Optional
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from django.contrib import messages
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from django.contrib.auth.mixins import LoginRequiredMixin
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from django.core.exceptions import PermissionDenied
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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.decorators import method_decorator
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from django.utils.http import urlencode
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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.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.template import render_to_string
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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.engine import PolicyEngine
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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.types import SAMLResponseParams
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LOGGER = get_logger()
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URL_VALIDATOR = URLValidator(schemes=("http", "https"))
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SESSION_KEY_SAML_REQUEST = "SAMLRequest"
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SESSION_KEY_SAML_RESPONSE = "SAMLResponse"
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SESSION_KEY_RELAY_STATE = "RelayState"
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SESSION_KEY_PARAMS = "SAMLParams"
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class SAMLAccessMixin:
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"""SAML base access mixin, checks access to an application based on its policies"""
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request: HttpRequest
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application: Application
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provider: SAMLProvider
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def _has_access(self) -> bool:
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"""Check if user has access to application, add an error if not"""
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policy_engine = PolicyEngine(self.application, self.request.user, self.request)
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policy_engine.build()
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result = policy_engine.result
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LOGGER.debug(
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"SAMLFlowInit _has_access",
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user=self.request.user,
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app=self.application,
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result=result,
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)
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if not result.passing:
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for message in result.messages:
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messages.error(self.request, _(message))
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return result.passing
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class SAMLSSOView(LoginRequiredMixin, SAMLAccessMixin, 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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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 self._has_access():
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raise PermissionDenied()
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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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{PLAN_CONTEXT_SSO: True, PLAN_CONTEXT_APPLICATION: self.application},
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)
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plan.stages.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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# Store these values now, because Django's login cycle won't preserve them.
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if SESSION_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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self.request.session[SESSION_KEY_SAML_REQUEST] = request.GET[
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SESSION_KEY_SAML_REQUEST
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]
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self.request.session[SESSION_KEY_RELAY_STATE] = request.GET.get(
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SESSION_KEY_RELAY_STATE, ""
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)
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try:
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self.provider.processor.can_handle(self.request)
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params = self.provider.processor.generate_response()
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self.request.session[SESSION_KEY_PARAMS] = params
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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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# Store these values now, because Django's login cycle won't preserve them.
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if SESSION_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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self.request.session[SESSION_KEY_SAML_REQUEST] = request.POST[
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SESSION_KEY_SAML_REQUEST
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]
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self.request.session[SESSION_KEY_RELAY_STATE] = request.POST.get(
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SESSION_KEY_RELAY_STATE, ""
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)
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try:
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self.provider.processor.can_handle(self.request)
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params = self.provider.processor.generate_response()
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self.request.session[SESSION_KEY_PARAMS] = params
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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 params 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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self.provider.processor.is_idp_initiated = True
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self.provider.processor.init_deep_link(self.request)
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params = self.provider.processor.generate_response()
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self.request.session[SESSION_KEY_PARAMS] = params
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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 = application.provider
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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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self.request.session.pop(SESSION_KEY_SAML_REQUEST, None)
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self.request.session.pop(SESSION_KEY_SAML_RESPONSE, None)
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self.request.session.pop(SESSION_KEY_RELAY_STATE, None)
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if SESSION_KEY_PARAMS not in self.request.session:
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return self.executor.stage_invalid()
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response: SAMLResponseParams = self.request.session.pop(SESSION_KEY_PARAMS)
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if provider.sp_binding == SAMLBindings.POST:
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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": response.acs_url,
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"application": application,
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"attrs": {
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"ACSUrl": response.acs_url,
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SESSION_KEY_SAML_RESPONSE: response.saml_response,
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SESSION_KEY_RELAY_STATE: response.relay_state,
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},
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},
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)
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if provider.sp_binding == SAMLBindings.REDIRECT:
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querystring = urlencode(
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{
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SESSION_KEY_SAML_RESPONSE: response.saml_response,
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SESSION_KEY_RELAY_STATE: response.relay_state,
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}
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)
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return redirect(f"{response.acs_url}?{querystring}")
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return bad_request_message(request, "Invalid sp_binding specified")
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class DescriptorDownloadView(LoginRequiredMixin, SAMLAccessMixin, 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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entity_id = provider.issuer
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saml_sso_binding_post = request.build_absolute_uri(
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reverse(
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"passbook_providers_saml:sso-post",
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kwargs={"application_slug": provider.application.slug},
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)
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)
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saml_sso_binding_redirect = request.build_absolute_uri(
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reverse(
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"passbook_providers_saml:sso-redirect",
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kwargs={"application_slug": provider.application.slug},
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)
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)
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subject_format = provider.processor.subject_format
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ctx = {
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"saml_sso_binding_post": saml_sso_binding_post,
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"saml_sso_binding_redirect": saml_sso_binding_redirect,
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"entity_id": entity_id,
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"subject_format": subject_format,
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}
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if provider.signing_kp:
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ctx["cert_public_key"] = strip_pem_header(
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provider.signing_kp.certificate_data.replace("\r", "")
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).replace("\n", "")
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return render_to_string("saml/xml/metadata.xml", ctx)
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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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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 self._has_access():
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raise PermissionDenied()
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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[
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"Content-Disposition"
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] = f'attachment; filename="{self.provider.name}_passbook_meta.xml"'
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return response
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