Protect FileVaultConfig from deletion

… when the FileVaultConfig is used in a Blueprint.

tests/mdm/test_api_filevault_configs_views.py

@@ -9,7 +9,7 @@
 from accounts.models import APIToken, User
 from zentral.contrib.mdm.models import FileVaultConfig
 from zentral.core.events.base import AuditEvent
-from .utils import force_filevault_config
+from .utils import force_blueprint, force_filevault_config
 
 
 @override_settings(STATICFILES_STORAGE='django.contrib.staticfiles.storage.StaticFilesStorage')
@@ -335,6 +335,14 @@ def test_delete_filevault_config_permission_denied(self):
  response = self.delete(reverse("mdm_api:filevault_config", args=(fv_config.pk,)))
  self.assertEqual(response.status_code, 403)
 
+ def test_delete_filevault_config_cannot_be_deleted(self):
+ fv_config = force_filevault_config()
+ force_blueprint(filevault_config=fv_config)
+ self.set_permissions("mdm.delete_filevaultconfig")
+ response = self.delete(reverse("mdm_api:filevault_config", args=(fv_config.pk,)))
+ self.assertEqual(response.status_code, 400)
+ self.assertEqual(response.json(), ["This FileVault configuration cannot be deleted"])
+
  @patch("zentral.core.queues.backends.kombu.EventQueues.post_event")
  def test_delete_filevault_config(self, post_event):
  fv_config = force_filevault_config()

tests/mdm/test_management_filevault_config.py

@@ -8,7 +8,7 @@
 from django.utils.crypto import get_random_string
 from accounts.models import User
 from zentral.core.events.base import AuditEvent
-from .utils import force_filevault_config
+from .utils import force_blueprint, force_filevault_config
 
 
 @override_settings(STATICFILES_STORAGE='django.contrib.staticfiles.storage.StaticFilesStorage')
@@ -51,13 +51,30 @@ def test_filevault_configurations_permission_denied(self):
  response = self.client.get(reverse("mdm:filevault_configs"))
  self.assertEqual(response.status_code, 403)
 
- def test_filevault_configurations(self):
+ def test_filevault_configurations_no_links(self):
  fv_config = force_filevault_config()
  self._login("mdm.view_filevaultconfig")
  response = self.client.get(reverse("mdm:filevault_configs"))
  self.assertEqual(response.status_code, 200)
  self.assertTemplateUsed(response, "mdm/filevaultconfig_list.html")
  self.assertContains(response, fv_config.name)
+ self.assertNotContains(response, reverse("mdm:update_filevault_config", args=(fv_config.pk,)))
+ self.assertNotContains(response, reverse("mdm:delete_filevault_config", args=(fv_config.pk,)))
+
+ def test_filevault_configurations_all_links(self):
+ fv_config1 = force_filevault_config()
+ force_blueprint(filevault_config=fv_config1)
+ fv_config2 = force_filevault_config()
+ self._login("mdm.view_filevaultconfig", "mdm.change_filevaultconfig", "mdm.delete_filevaultconfig")
+ response = self.client.get(reverse("mdm:filevault_configs"))
+ self.assertEqual(response.status_code, 200)
+ self.assertTemplateUsed(response, "mdm/filevaultconfig_list.html")
+ self.assertContains(response, fv_config1.name)
+ self.assertContains(response, fv_config2.name)
+ self.assertContains(response, reverse("mdm:update_filevault_config", args=(fv_config1.pk,)))
+ self.assertNotContains(response, reverse("mdm:delete_filevault_config", args=(fv_config1.pk,)))
+ self.assertContains(response, reverse("mdm:update_filevault_config", args=(fv_config2.pk,)))
+ self.assertContains(response, reverse("mdm:delete_filevault_config", args=(fv_config2.pk,)))
 
  # create FileVault configuration
 
@@ -190,6 +207,16 @@ def test_filevault_configuration_get_no_perm_no_delete_link(self):
  self.assertContains(response, fv_config.name)
  self.assertNotContains(response, reverse("mdm:delete_filevault_config", args=(fv_config.pk,)))
 
+ def test_filevault_configuration_get_cannot_be_deleted_no_delete_link(self):
+ fv_config = force_filevault_config()
+ force_blueprint(filevault_config=fv_config)
+ self._login("mdm.view_filevaultconfig", "mdm.delete_filevaultconfig")
+ response = self.client.get(reverse("mdm:filevault_config", args=(fv_config.pk,)))
+ self.assertEqual(response.status_code, 200)
+ self.assertTemplateUsed(response, "mdm/filevaultconfig_detail.html")
+ self.assertContains(response, fv_config.name)
+ self.assertNotContains(response, reverse("mdm:delete_filevault_config", args=(fv_config.pk,)))
+
  # update FileVault configuration
 
  def test_update_filevault_configuration_redirect(self):
@@ -284,6 +311,13 @@ def test_delete_filevault_configuration_permission_denied(self):
  response = self.client.get(reverse("mdm:delete_filevault_config", args=(fv_config.pk,)))
  self.assertEqual(response.status_code, 403)
 
+ def test_delete_filevault_configuration_404(self):
+ fv_config = force_filevault_config()
+ force_blueprint(filevault_config=fv_config)
+ self._login("mdm.delete_filevaultconfig")
+ response = self.client.get(reverse("mdm:delete_filevault_config", args=(fv_config.pk,)))
+ self.assertEqual(response.status_code, 404)
+
  def test_delete_filevault_configuration_get(self):
  fv_config = force_filevault_config()
  self._login("mdm.delete_filevaultconfig")

zentral/contrib/mdm/api_views/filevault_configs.py

@@ -1,3 +1,4 @@
+from rest_framework.exceptions import ValidationError
 from zentral.utils.drf import ListCreateAPIViewWithAudit, RetrieveUpdateDestroyAPIViewWithAudit
 from zentral.contrib.mdm.models import FileVaultConfig
 from zentral.contrib.mdm.serializers import FileVaultConfigSerializer
@@ -18,3 +19,9 @@ class FileVaultConfigDetail(RetrieveUpdateDestroyAPIViewWithAudit):
  """
  queryset = FileVaultConfig.objects.all()
  serializer_class = FileVaultConfigSerializer
+
+ def perform_destroy(self, instance):
+ if not instance.can_be_deleted():
+ raise ValidationError('This FileVault configuration cannot be deleted')
+ else:
+ return super().perform_destroy(instance)

zentral/contrib/mdm/models.py

@@ -97,6 +97,11 @@ def rewrap_secrets(self):
 # FileVault
 
 
+class FileVaultConfigManager(models.Manager):
+ def can_be_deleted(self):
+ return self.annotate(bp_count=Count("blueprint")).filter(bp_count=0)
+
+
 class FileVaultConfig(models.Model):
  name = models.CharField(max_length=256, unique=True)
  escrow_location_display_name = models.CharField(
@@ -133,6 +138,8 @@ class FileVaultConfig(models.Model):
  created_at = models.DateTimeField(auto_now_add=True)
  updated_at = models.DateTimeField(auto_now=True)
 
+ objects = FileVaultConfigManager()
+
  class Meta:
  ordering = ("name",)
  verbose_name = "filevault config"
@@ -150,6 +157,9 @@ def uuid(self):
  f"{self.destroy_key_on_standby}|{self.prk_rotation_interval_days}".encode("utf-8"))
  return uuid.UUID(hex=h.hexdigest())
 
+ def can_be_deleted(self):
+ return FileVaultConfig.objects.can_be_deleted().filter(pk=self.pk).exists()
+
  def serialize_for_event(self, keys_only=False):
  d = {"pk": self.pk, "name": self.name}
  if keys_only:

zentral/contrib/mdm/templates/mdm/filevaultconfig_detail.html

@@ -84,7 +84,7 @@ <h3>{{ object }}</h3>
  Edit
  </a>
  {% endif %}
- {% if perms.mdm.delete_filevaultconfig %}
+ {% if perms.mdm.delete_filevaultconfig and object.can_be_deleted %}
  <a class="btn btn-danger"
  href="{% url 'mdm:delete_filevault_config' object.pk %}">
  <span class="glyphicon glyphicon-trash" aria-hidden="true"></span>

zentral/contrib/mdm/templates/mdm/filevaultconfig_list.html

@@ -56,7 +56,7 @@ <h3>{{ page_obj.paginator.count }} FileVault configuration{{ page_obj.paginator.
  <span class="glyphicon glyphicon-edit" aria-hidden="true"></span>
  </a>
  {% endif %}
- {% if perms.mdm.delete_filevaultconfig %}
+ {% if perms.mdm.delete_filevaultconfig and filevault_config.can_be_deleted %}
  <a href="{% url 'mdm:delete_filevault_config' filevault_config.pk %}" class="btn btn-xs btn-danger">
  <span class="glyphicon glyphicon-trash" aria-hidden="true"></span>
  </a>

zentral/contrib/mdm/views/management.py

@@ -974,9 +974,11 @@ def form_valid(self, form):
 
 class DeleteBlueprintView(PermissionRequiredMixin, DeleteViewWithAudit):
  permission_required = "mdm.delete_blueprint"
- queryset = Blueprint.objects.can_be_deleted()
  success_url = reverse_lazy("mdm:blueprints")
 
+ def get_queryset(self):
+ return Blueprint.objects.can_be_deleted()
+
 
 # FileVault Configurations
 
@@ -1012,9 +1014,11 @@ class UpdateFileVaultConfigView(PermissionRequiredMixin, UpdateViewWithAudit):
 
 class DeleteFileVaultConfigView(PermissionRequiredMixin, DeleteViewWithAudit):
  permission_required = "mdm.delete_filevaultconfig"
- model = FileVaultConfig
  success_url = reverse_lazy("mdm:filevault_configs")
 
+ def get_queryset(self):
+ return FileVaultConfig.objects.can_be_deleted()
+
 
 # SCEP Configurations