apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: require-allow-privilege-escalation-false
  annotations:
    policies.kyverno.io/title: Require allowPrivilegeEscalation false
    policies.kyverno.io/category: Pod Security
    policies.kyverno.io/severity: medium
    policies.kyverno.io/description: >-
      Require every container to set allowPrivilegeEscalation: false (unset is a
      fail).
spec:
  validationFailureAction: Enforce
  background: true
  rules:
    - name: require-allow-privilege-escalation-false
      match:
        any:
          - resources:
              kinds:
                - Pod
      exclude:
        any:
          - resources:
              namespaces:
                - kube-system
                - kube-public
                - kube-node-lease
                - flux-system
                - flux-canary
                - kyverno
                - cert-manager
                - cilium-secrets
                - olm
                - operators
                - longhorn
                - openebs
                - intel-system
                - nfd
      validate:
        message: >-
          Containers must set securityContext.allowPrivilegeEscalation: false
          (leaving the field unset is not sufficient).
        pattern:
          spec:
            =(initContainers):
              - securityContext:
                  allowPrivilegeEscalation: false
            =(ephemeralContainers):
              - securityContext:
                  allowPrivilegeEscalation: false
            containers:
              - securityContext:
                  allowPrivilegeEscalation: false