apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: disallow-privileged-containers
  annotations:
    policies.kyverno.io/title: Disallow Privileged Containers
    policies.kyverno.io/category: Pod Security
    policies.kyverno.io/severity: critical

spec:
  validationFailureAction: Enforce
  background: true

  rules:
    - name: disallow-privileged
      match:
        any:
          - resources:
              kinds:
                - Pod

      validate:
        message: "Privileged containers are not allowed."

        foreach:
          - list: "request.object.spec.containers"
            deny:
              conditions:
                any:
                  - key: "{{ element.securityContext.privileged || `false` }}"
                    operator: Equals
                    value: true

          - list: "request.object.spec.initContainers || []"
            deny:
              conditions:
                any:
                  - key: "{{ element.securityContext.privileged || `false` }}"
                    operator: Equals
                    value: true

          - list: "request.object.spec.ephemeralContainers || []"
            deny:
              conditions:
                any:
                  - key: "{{ element.securityContext.privileged || `false` }}"
                    operator: Equals
                    value: true