← Policy catalog
</> ValidatingAdmissionPolicy · Apache-2.0

Provisions Azure Disks Without a Customer-Managed Key

storageclass-cmek-azure-disk

severityLow resourceStorageClasses productKubernetes bundles1

Without a Disk Encryption Set, disks provisioned from this class fall back to platform-managed keys that you cannot rotate, audit or revoke, so snapshots and disk copies stay readable to anyone with subscription-level access.

Rejects unless

object.provisioner != 'disk.csi.azure.com' ||
(has(object.parameters) && 'diskEncryptionSetID' in object.parameters &&
 object.parameters['diskEncryptionSetID'] != '')

Azure Disk StorageClasses must use a customer-managed Disk Encryption Set (parameters.diskEncryptionSetID).

Remediation

Set parameters.diskEncryptionSetID to the resource ID of a Disk Encryption Set backed by your own key vault key on disk.csi.azure.com StorageClasses. Field: parameters.diskEncryptionSetID.

Applies to

  • storageclasses · storage.k8s.io/v1 · CREATE, UPDATE

Manifest

apiVersion: admissionregistration.k8s.io/v1
kind: ValidatingAdmissionPolicy
metadata:
  name: storageclass-cmek-azure-disk
  annotations:
    kubeapt.io/uuid: "ac28076c-cb38-46d4-b611-5f4e80bb46b3"
    security.kubeapt.io/displayName: "Provisions Azure Disks Without a Customer-Managed Key"
    security.kubeapt.io/description: "Without a Disk Encryption Set, disks provisioned from this class fall back to platform-managed keys that you cannot rotate, audit or revoke, so snapshots and disk copies stay readable to anyone with subscription-level access."
    security.kubeapt.io/resource: "StorageClasses"
    security.kubeapt.io/severity: "Low"
    security.kubeapt.io/remediation: "Set parameters.diskEncryptionSetID to the resource ID of a Disk Encryption Set backed by your own key vault key on disk.csi.azure.com StorageClasses. Field: parameters.diskEncryptionSetID."
    security.kubeapt.io/product: "Kubernetes"
spec:
  failurePolicy: Fail
  matchConstraints:
    resourceRules:
    - apiGroups:
      - storage.k8s.io
      apiVersions:
      - v1
      operations:
      - CREATE
      - UPDATE
      resources:
      - storageclasses
  validations:
  - expression: |
      object.provisioner != 'disk.csi.azure.com' ||
      (has(object.parameters) && 'diskEncryptionSetID' in object.parameters &&
       object.parameters['diskEncryptionSetID'] != '')
    message: |
      Azure Disk StorageClasses must use a customer-managed Disk Encryption Set (parameters.diskEncryptionSetID).

Save it as storageclass-cmek-azure-disk.yaml — the commands below assume that name.

Validate with kubeapt

Check a workload against this one policy, before anything is installed on a cluster.

$ kubeapt validate -p ./storageclass-cmek-azure-disk.yaml -r ./workload.yaml

Or without the file, from the published policy set — -r takes a directory too:

$ kubeapt policies download && kubeapt validate --policy-name storageclass-cmek-azure-disk -r ./manifests

Or against every namespace in the cluster your kubeconfig points at:

$ kubeapt validate --policy-name storageclass-cmek-azure-disk -A

Bundles

Source

View policy.yaml on GitHub →