apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: require-non-root
  annotations:
    policies.kyverno.io/title: Require Non-Root Containers
    policies.kyverno.io/category: Pod Security
    policies.kyverno.io/severity: high
spec:
  validationFailureAction: Enforce
  background: true

  rules:
    - name: require-pod-run-as-non-root
      match:
        any:
          - resources:
              kinds:
                - Pod
      exclude:
        any:
          - resources:
              selector:
                matchLabels:
                  security.policy/allow-root: "true"
          - resources:
              namespaceSelector:
                matchLabels:
                  policy.home.arpa/allow-root: "true"

      validate:
        message: "Pods must set runAsNonRoot=true."
        pattern:
          spec:
            securityContext:
              runAsNonRoot: true

    - name: require-container-run-as-non-root
      match:
        any:
          - resources:
              kinds:
                - Pod
      exclude:
        any:
          - resources:
              selector:
                matchLabels:
                  security.policy/allow-root: "true"
          - resources:
              namespaceSelector:
                matchLabels:
                  policy.home.arpa/allow-root: "true"

      validate:
        message: "All containers must set runAsNonRoot=true."

        foreach:
          - list: "request.object.spec.containers"
            pattern:
              securityContext:
                runAsNonRoot: true

          - list: "request.object.spec.initContainers"
            pattern:
              securityContext:
                runAsNonRoot: true

          - list: "request.object.spec.ephemeralContainers"
            pattern:
              securityContext:
                runAsNonRoot: true