Homelabv4/infrastructure/kyverno/policies/disallow-default-namespace.yaml

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: disallow-default-namespace
  annotations:
    policies.kyverno.io/title: Disallow Default Namespace
    policies.kyverno.io/category: DoD STIG
    policies.kyverno.io/severity: medium
    policies.kyverno.io/description: >-
      STIG V-242383: Workloads must not run in the default namespace.
      The default namespace lacks proper RBAC and network policy boundaries.
spec:
  validationFailureAction: Enforce
  background: true
  rules:
    - name: validate-namespace
      match:
        any:
          - resources:
              kinds:
                - Pod
                - Deployment
                - StatefulSet
                - DaemonSet
                - Job
                - CronJob
              namespaces:
                - default
      validate:
        message: >-
          Workloads must not run in the default namespace (STIG V-242383).
          Create a dedicated namespace for your application.
        deny: {}