68 lines
2.3 KiB
Python
68 lines
2.3 KiB
Python
"""OIDC Permission checking"""
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from typing import Optional
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from django.contrib import messages
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from django.db.models.deletion import Collector
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from django.http import HttpRequest, HttpResponse
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from django.shortcuts import redirect
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from oidc_provider.models import Client
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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, User
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from passbook.flows.planner import FlowPlan
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from passbook.flows.views import SESSION_KEY_PLAN
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from passbook.policies.engine import PolicyEngine
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LOGGER = get_logger()
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def client_related_provider(client: Client) -> Optional[Provider]:
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"""Lookup related Application from Client"""
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# because oidc_provider is also used by app_gw, we can't be
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# sure an OpenIDProvider instance exists. hence we look through all related models
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# and choose the one that inherits from Provider, which is guaranteed to
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# have the application property
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collector = Collector(using="default")
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collector.collect([client])
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for _, related in collector.data.items():
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related_object = next(iter(related))
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if isinstance(related_object, Provider):
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return related_object
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return None
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def check_permissions(
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request: HttpRequest, user: User, client: Client
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) -> Optional[HttpResponse]:
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"""Check permissions, used for
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https://django-oidc-provider.readthedocs.io/en/latest/
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sections/settings.html#oidc-after-userlogin-hook"""
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provider = client_related_provider(client)
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if not provider:
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return redirect("passbook_flows:denied")
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try:
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application = provider.application
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except Application.DoesNotExist:
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return redirect("passbook_flows:denied")
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LOGGER.debug(
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"Checking permissions for application", user=user, application=application
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)
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policy_engine = PolicyEngine(application, user, request)
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policy_engine.build()
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# Check permissions
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result = policy_engine.result
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if not result.passing:
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for policy_message in result.messages:
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messages.error(request, policy_message)
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return redirect("passbook_flows:denied")
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plan: FlowPlan = request.session[SESSION_KEY_PLAN]
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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=plan.flow_pk,
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).from_http(request)
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return None
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