apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: disallow-host-network
  annotations:
    policies.kyverno.io/title: Disallow host network and host PID
    policies.kyverno.io/category: Pod Security Standards
    policies.kyverno.io/severity: high
    # CIS 5.2.3: minimize hostPID; CIS 5.2.5: minimize hostNetwork.
    policies.kyverno.io/cis-control: "5.2.3, 5.2.5"
spec:
  validationFailureAction: Enforce
  background: false
  failurePolicy: Fail
  rules:
    - name: no-host-network-or-pid
      match:
        any:
          - resources:
              kinds:
                - Pod
              namespaceSelector:
                matchLabels:
                  security-baseline/open: "true"
      validate:
        message: hostNetwork, hostPID, and hostIPC must be false or omitted.
        pattern:
          spec:
            =(hostNetwork): false
            =(hostPID): false
            =(hostIPC): false