core: make application's check_access API return a PolicyResult and accept for_user as superuser

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

authentik/core/api/applications.py

@@ -13,7 +13,12 @@ from drf_spectacular.utils import (
     inline_serializer,
 )
 from rest_framework.decorators import action
-from rest_framework.fields import CharField, FileField, SerializerMethodField
+from rest_framework.fields import (
+    CharField,
+    FileField,
+    IntegerField,
+    SerializerMethodField,
+)
 from rest_framework.parsers import MultiPartParser
 from rest_framework.request import Request
 from rest_framework.response import Response
@@ -25,9 +30,11 @@ from structlog.stdlib import get_logger
 from authentik.admin.api.metrics import CoordinateSerializer, get_events_per_1h
 from authentik.api.decorators import permission_required
 from authentik.core.api.providers import ProviderSerializer
-from authentik.core.models import Application
+from authentik.core.models import Application, User
 from authentik.events.models import EventAction
+from authentik.policies.api.exec import PolicyTestResultSerializer
 from authentik.policies.engine import PolicyEngine
+from authentik.policies.types import PolicyResult
 from authentik.stages.user_login.stage import USER_LOGIN_AUTHENTICATED
 
 LOGGER = get_logger()
@@ -112,23 +119,34 @@ class ApplicationViewSet(ModelViewSet):
         return applications
 
     @extend_schema(
+        request=inline_serializer(
+            "CheckAccessRequest", fields={"for_user": IntegerField(required=False)}
+        ),
         responses={
-            204: OpenApiResponse(description="Access granted"),
-            403: OpenApiResponse(description="Access denied"),
-        }
+            200: PolicyTestResultSerializer(),
+            404: OpenApiResponse(description="for_user user not found"),
+        },
     )
-    @action(detail=True, methods=["GET"])
+    @action(detail=True, methods=["POST"])
     # pylint: disable=unused-argument
     def check_access(self, request: Request, slug: str) -> Response:
         """Check access to a single application by slug"""
         # Don't use self.get_object as that checks for view_application permission
         # which the user might not have, even if they have access
         application = get_object_or_404(Application, slug=slug)
-        engine = PolicyEngine(application, self.request.user, self.request)
+        # If the current user is superuser, they can set `for_user`
+        for_user = self.request.user
+        if self.request.user.is_superuser and "for_user" in request.data:
+            for_user = get_object_or_404(User, pk=request.data.get("for_user"))
+        engine = PolicyEngine(application, for_user, self.request)
         engine.build()
-        if engine.passing:
-            return Response(status=204)
-        return Response(status=403)
+        result = engine.result
+        response = PolicyTestResultSerializer(PolicyResult(False))
+        if result.passing:
+            response = PolicyTestResultSerializer(PolicyResult(True))
+        if self.request.user.is_superuser:
+            response = PolicyTestResultSerializer(result)
+        return Response(response.data)
 
     @extend_schema(
         parameters=[

authentik/core/tests/test_applications_api.py

@@ -26,20 +26,26 @@ class TestApplicationsAPI(APITestCase):
     def test_check_access(self):
         """Test check_access operation"""
         self.client.force_login(self.user)
-        response = self.client.get(
+        response = self.client.post(
             reverse(
                 "authentik_api:application-check-access",
                 kwargs={"slug": self.allowed.slug},
             )
         )
-        self.assertEqual(response.status_code, 204)
-        response = self.client.get(
+        self.assertEqual(response.status_code, 200)
+        self.assertJSONEqual(
+            force_str(response.content), {"messages": [], "passing": True}
+        )
+        response = self.client.post(
             reverse(
                 "authentik_api:application-check-access",
                 kwargs={"slug": self.denied.slug},
             )
         )
-        self.assertEqual(response.status_code, 403)
+        self.assertEqual(response.status_code, 200)
+        self.assertJSONEqual(
+            force_str(response.content), {"messages": ["dummy"], "passing": False}
+        )
 
     def test_list(self):
         """Test list operation without superuser_full_list"""

outpost/pkg/ldap/instance_bind.go

@@ -74,8 +74,8 @@ func (pi *ProviderInstance) Bind(username string, bindDN, bindPW string, conn ne
 	if !passed {
 		return ldap.LDAPResultInvalidCredentials, nil
 	}
-	r, err := apiClient.CoreApi.CoreApplicationsCheckAccessRetrieve(context.Background(), pi.appSlug).Execute()
-	if r.StatusCode == 403 {
+	p, _, err := apiClient.CoreApi.CoreApplicationsCheckAccessCreate(context.Background(), pi.appSlug).Execute()
+	if !p.Passing {
 		pi.log.WithField("bindDN", bindDN).Info("Access denied for user")
 		return ldap.LDAPResultInsufficientAccessRights, nil
 	}

schema.yml

@@ -1368,8 +1368,8 @@ paths:
         '403':
           $ref: '#/components/schemas/GenericError'
   /api/v2beta/core/applications/{slug}/check_access/:
-    get:
-      operationId: core_applications_check_access_retrieve
+    post:
+      operationId: core_applications_check_access_create
       description: Check access to a single application by slug
       parameters:
       - in: path
@@ -1380,16 +1380,33 @@ paths:
         required: true
       tags:
       - core
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/CheckAccessRequestRequest'
+          application/x-www-form-urlencoded:
+            schema:
+              $ref: '#/components/schemas/CheckAccessRequestRequest'
+          multipart/form-data:
+            schema:
+              $ref: '#/components/schemas/CheckAccessRequestRequest'
       security:
       - authentik: []
       - cookieAuth: []
       responses:
-        '204':
-          description: Access granted
-        '403':
-          description: Access denied
+        '200':
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/PolicyTestResult'
+          description: ''
+        '404':
+          description: for_user user not found
         '400':
           $ref: '#/components/schemas/ValidationError'
+        '403':
+          $ref: '#/components/schemas/GenericError'
   /api/v2beta/core/applications/{slug}/metrics/:
     get:
       operationId: core_applications_metrics_list
@@ -16120,6 +16137,11 @@ components:
       - shell
       - redirect
       type: string
+    CheckAccessRequestRequest:
+      type: object
+      properties:
+        for_user:
+          type: integer
     ClientTypeEnum:
       enum:
       - confidential