kyverno/samples/best_practices/disallow_automountingapicred.yaml

apiVersion : kyverno.io/v1alpha1
kind: ClusterPolicy
metadata:
  name: validate-disallow-automoutingapicred
  annotations:
    policies.kyverno.io/category: API Server Access Control
    policies.kyverno.io/description: |
      Kubernetes automounts default service account credentials in each pod. To restrict access, opt out of automounting credentials by setting 'automountServiceAccountToken' to 'false'.
spec:
  rules:
  - name: disallow-automoutingapicred
    match:
      resources:
        kinds:
        - Pod
    validate:
      message: "Deny automounting API credentials"
      pattern:
        spec:
          =(serviceAccountName): "*"
          automountServiceAccountToken: false