apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: require-resource-limits
  annotations:
    policies.kyverno.io/title: Require CPU and memory limits
    policies.kyverno.io/category: Resource governance
    policies.kyverno.io/severity: medium
    # Supplemental hardening aligned with CIS 5.7.3 workload controls. The
    # CIS benchmark does not define a one-to-one resource-limit test.
    policies.kyverno.io/cis-control: "5.7.3 supplemental"
spec:
  validationFailureAction: Enforce
  background: false
  failurePolicy: Fail
  rules:
    - name: containers-have-resource-limits
      match:
        any:
          - resources:
              kinds:
                - Pod
              namespaceSelector:
                matchLabels:
                  security-baseline/open: "true"
      validate:
        message: Every container must define CPU and memory limits.
        foreach:
          - list: request.object.spec.containers[]
            deny:
              conditions:
                any:
                  - key: "{{ element.resources.limits.cpu || '' }}"
                    operator: Equals
                    value: ""
                  - key: "{{ element.resources.limits.memory || '' }}"
                    operator: Equals
                    value: ""
          - list: request.object.spec.initContainers[]
            deny:
              conditions:
                any:
                  - key: "{{ element.resources.limits.cpu || '' }}"
                    operator: Equals
                    value: ""
                  - key: "{{ element.resources.limits.memory || '' }}"
                    operator: Equals
                    value: ""