Enforce Istio Sidecar Injection in CEL expressions

 1apiVersion: kyverno.io/v1
 2kind: ClusterPolicy
 3metadata:
 4  name: enforce-sidecar-injection-namespace
 5  annotations:
 6    policies.kyverno.io/title: Enforce Istio Sidecar Injection in CEL expressions
 7    policies.kyverno.io/category: Istio in CEL 
 8    policies.kyverno.io/severity: medium
 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: Namespace
13    policies.kyverno.io/description: >-
14      In order for Istio to inject sidecars to workloads deployed into Namespaces, the label
15      `istio-injection` must be set to `enabled`. This policy ensures that all new Namespaces
16      set `istio-inject` to `enabled`.
17spec:
18  validationFailureAction: Audit
19  background: true
20  rules:
21  - name: check-istio-injection-enabled
22    match:
23      any:
24      - resources:
25          kinds:
26          - Namespace
27          operations:
28          - CREATE
29    validate:
30      cel:
31        expressions:
32          - expression: "object.metadata.?labels[?'istio-injection'].orValue('') == 'enabled'"
33            message: "All new Namespaces must have Istio sidecar injection enabled."