apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: require-drop-all-capabilities
  annotations:
    policies.kyverno.io/title: Require Drop All Capabilities
    policies.kyverno.io/category: DoD STIG
    policies.kyverno.io/severity: high
    policies.kyverno.io/description: >-
      STIG V-242398: Containers must drop all Linux capabilities and only
      add back specific capabilities that are required. This follows the
      principle of least privilege for container security contexts.
spec:
  validationFailureAction: Audit
  background: true
  rules:
    - name: require-drop-all
      match:
        any:
          - resources:
              kinds:
                - Pod
      exclude:
        any:
          - resources:
              namespaces:
                - kube-system
                - rook-ceph
                - istio-system
                - prometheus
                - kyverno
                - argocd
                - cert-manager
                - cnpg-system
                - envoy-gateway-system
                - kiali-operator
                - mariadb-system
                - redis-operator
                - reloader
                - scylla-operator
                - vault
                - mqtt
                - gitlab
                - netbird
                - grafana
                - crowdsec
                - external-dns
                - nextcloud
                - home-assistant
                - guacamole
                - teslamate
                - unpoller
                - frigate
                - authentik
                - checkov
                - external-secrets
      validate:
        message: >-
          Containers must drop ALL capabilities (STIG V-242398).
          Add securityContext.capabilities.drop: ["ALL"] to each container.
        pattern:
          spec:
            containers:
              - securityContext:
                  capabilities:
                    drop:
                      - ALL
            =(initContainers):
              - securityContext:
                  capabilities:
                    drop:
                      - ALL