policies/kyverno/cluster-policies/4-dep-valid-role.yaml

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: deployment-valid-role
  labels:
    app: kyverno
    owner: jimmy
  annotations:
    policies.kyverno.io/category: Security
    policies.kyverno.io/description: Rules to enforce valid roles, based on namespace-role dictionary
spec:
  validationFailureAction: enforce
  rules:
  - name: validate-role-annotation
    context:
      - name: ns-roles-dictionary
        configMap:
          name: ns-roles-dictionary
          namespace: kyverno
    match:
      resources:
        kinds:
        - Deployment
    preconditions:
    - key: "{{ request.object.metadata.namespace }}"
      operator: In
      value: ["prod", "dev", "kyverno-test"]
    - key: "{{ request.object.spec.template.metadata.annotations.\"iam.amazonaws.com/role\" }}"
      operator: NotEqual
      value: ""
    validate:
      message: "Annotation iam.amazonaws.com/role \"{{ request.object.spec.template.metadata.annotations.\"iam.amazonaws.com/role\" }}\" is not allowed for the \"{{ request.object.metadata.namespace }}\" namespace."
      deny:
        conditions:
        - key: "{{ request.object.spec.template.metadata.annotations.\"iam.amazonaws.com/role\" }}"
          operator: NotIn
          value:  "{{ \"ns-roles-dictionary\".data.\"{{ request.object.metadata.namespace }}\" }}"