---
# Caution: read the notes for this default-pod-security-configurable policy before
# you apply it, so that you understand the information security consequences.
apiVersion: admissionregistration.k8s.io/v1
kind: MutatingAdmissionPolicy
metadata:
  name: "default-pod-security-configurable"
  annotations:
    kubernetes.io/description: "Default new namespaces to enforce the chosen pod security standard"
spec:
  reinvocationPolicy: IfNeeded
  paramKind:
    apiVersion: v1
    kind: ConfigMap
  matchConstraints:
    resourceRules:
    - apiGroups:   [""]
      apiVersions: ["v1"]
      operations:  ["CREATE"]
      resources:   ["namespaces"]
  matchConditions:
    - name: "exclude-system-namespaces"
      # If the name begins with "kube-", it's a system namespace.
      # Assume that the API server or cluster management tooling applies relevant defaults.
      expression: "!object.metadata.name.startsWith('kube-')"
    - name: "no-existing-pod-security-label"
      expression: "!('pod-security.kubernetes.io/enforce' in object.metadata.labels)"
  mutations:
    - patchType: "ApplyConfiguration"
      applyConfiguration:
        expression: "Object{metadata: Object.metadata{labels: {'pod-security.kubernetes.io/enforce': params.data.default}}}"