kyverno/test/cli/registry/image-example.yaml

---
apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: images
spec:
  validationFailureAction: enforce
  rules:
  - name: only-allow-trusted-images
    match:
      resources:
        kinds:
        - Pod
    preconditions:
      - key: "{{request.operation}}"
        operator: NotEquals
        value: DELETE
    validate:
      message: "images with root user are not allowed"
      foreach:
      - list: "request.object.spec.containers"
        context:
        - name: imageData
          imageRegistry:
            reference: "{{ element.image }}"
        deny:
          conditions:
            all:
              - key: "{{ imageData.configData.config.User || ''}}"
                operator: Equals
                value: ""
              - key: "{{ imageData.registry }}"
                operator: NotEquals
                value: "ghcr.io"
---
apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: check-image-base
spec:
  validationFailureAction: enforce
  rules:
  - name: check-image-base-rule
    match:
      any:
      - resources:
          kinds:
          - Pod
    preconditions:
      all:
      - key: "{{request.operation}}"
        operator: NotEquals
        value: DELETE
    validate:
      message: "Images must specify a source/base image from which they are built to be valid."
      foreach:
      - list: "request.object.spec.containers"
        context:
        - name: imageData
          imageRegistry:
            reference: "{{ element.image }}"
        - name: mobysource
          variable:
            jmesPath: imageData.configData."moby.buildkit.buildinfo.v1" | base64_decode(@).parse_json(@) | sources[].ref | length(@)
            default: 0
        deny:
          conditions:
            all:
              - key: "{{ mobysource }}"
                operator: Equals
                value: 0