Enforce etcd encryption in OpenShift in CEL expressions

 1apiVersion: kyverno.io/v1
 2kind: ClusterPolicy
 3metadata:
 4  name: enforce-etcd-encryption
 5  annotations:
 6    policies.kyverno.io/title: Enforce etcd encryption in OpenShift in CEL expressions
 7    policies.kyverno.io/category: OpenShift
 8    policies.kyverno.io/severity: high
 9    kyverno.io/kyverno-version: 1.11.0
10    policies.kyverno.io/minversion: 1.11.0
11    kyverno.io/kubernetes-version: "1.26-1.27"
12    policies.kyverno.io/subject: APIServer
13    policies.kyverno.io/description: >-
14      Encryption at rest is a security best practice. This policy ensures encryption is enabled for etcd in OpenShift clusters.
15spec:
16  validationFailureAction: Enforce
17  background: true
18  rules:
19  - name: check-etcd-encryption
20    match:
21      any:
22      - resources:
23          kinds:
24          - config.openshift.io/v1/APIServer
25          operations:
26          - CREATE
27          - UPDATE
28    validate:
29      cel:
30        expressions:
31          - expression: "has(object.spec.encryption)"
32            message: >-
33              Encryption should be enabled for etcd