Homelabv4/infrastructure/kyverno/policies/disallow-privileged.yaml

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: disallow-privileged-containers
  annotations:
    policies.kyverno.io/title: Disallow Privileged Containers
    policies.kyverno.io/category: Zero Trust
    policies.kyverno.io/severity: high
spec:
  validationFailureAction: Enforce
  background: true
  rules:
    - name: disallow-privileged
      match:
        any:
          - resources:
              kinds:
                - Pod
      exclude:
        any:
          - resources:
              namespaces:
                - kube-system
                - rook-ceph
                - istio-system
                - kube-node-lease
                - prometheus
                - kyverno
                - tetragon
                - crowdsec
      validate:
        message: "Privileged containers are not allowed."
        pattern:
          spec:
            containers:
              - =(securityContext):
                  =(privileged): false
            =(initContainers):
              - =(securityContext):
                  =(privileged): false
            =(ephemeralContainers):
              - =(securityContext):
                  =(privileged): false