🔒️(backend) role in ask_for_access must be lower than user role

We check that the role set in a ask_for_access is not higher than the
user's role accepting the request. We prevent case where ad min will
grant a user owner in order to take control of the document. Only owner
can accept an owner role.

src/backend/core/api/viewsets.py

@@ -2162,7 +2162,19 @@ class DocumentAskForAccessViewSet(
         serializer = serializers.RoleSerializer(data=request.data)
         serializer.is_valid(raise_exception=True)
 
-        document_ask_for_access.accept(role=serializer.validated_data.get("role"))
+        document = self.get_document_or_404()
+        user_role = document.get_role(request.user)
+        target_role = serializer.validated_data.get("role")
+
+        if models.RoleChoices.get_priority(user_role) < models.RoleChoices.get_priority(
+            target_role
+        ):
+            return drf.response.Response(
+                {"detail": "You cannot accept a role higher than your own."},
+                status=drf.status.HTTP_400_BAD_REQUEST,
+            )
+
+        document_ask_for_access.accept(role=target_role)
         return drf.response.Response(status=drf.status.HTTP_204_NO_CONTENT)
 
 

src/backend/core/tests/documents/test_api_documents_ask_for_access.py

@@ -749,6 +749,53 @@ def test_api_documents_ask_for_access_accept_authenticated_owner_or_admin_update
     assert document_access.role == RoleChoices.ADMIN
 
 
+def test_api_documents_ask_for_access_accept_admin_cannot_accept_owner_role():
+    """
+    Admin users should not be able to accept document ask for access with the owner role.
+    """
+    user = UserFactory()
+    document = DocumentFactory(users=[(user, RoleChoices.ADMIN)])
+    document_ask_for_access = DocumentAskForAccessFactory(
+        document=document, role=RoleChoices.READER
+    )
+
+    client = APIClient()
+    client.force_login(user)
+
+    response = client.post(
+        f"/api/v1.0/documents/{document.id}/ask-for-access/{document_ask_for_access.id}/accept/",
+        data={"role": RoleChoices.OWNER},
+    )
+    assert response.status_code == 400
+    assert response.json() == {
+        "detail": "You cannot accept a role higher than your own."
+    }
+
+
+def test_api_documents_ask_for_access_accept_owner_can_accept_owner_role():
+    """
+    Owner users should be able to accept document ask for access with the owner role.
+    """
+    user = UserFactory()
+    document = DocumentFactory(users=[(user, RoleChoices.OWNER)])
+    document_ask_for_access = DocumentAskForAccessFactory(
+        document=document, role=RoleChoices.READER
+    )
+
+    client = APIClient()
+    client.force_login(user)
+
+    response = client.post(
+        f"/api/v1.0/documents/{document.id}/ask-for-access/{document_ask_for_access.id}/accept/",
+        data={"role": RoleChoices.OWNER},
+    )
+    assert response.status_code == 204
+
+    assert not DocumentAskForAccess.objects.filter(
+        id=document_ask_for_access.id
+    ).exists()
+
+
 @pytest.mark.parametrize("role", [RoleChoices.OWNER, RoleChoices.ADMIN])
 def test_api_documents_ask_for_access_accept_authenticated_non_root_document(role):
     """