← Policy catalog
</> ValidatingAdmissionPolicy · Apache-2.0

Sets No Pod Security Standards Label

namespace-pod-security-standards

severityModerate resourceNamespaces productKubernetes bundles1

A namespace that is not held to at least the baseline Pod Security Standard lets anyone able to create pods there run privileged, host-networked or hostPath workloads and break out to the node unchallenged.

Rejects unless

(has(object.metadata.labels) && "pod-security.kubernetes.io/enforce" in object.metadata.labels && object.metadata.labels["pod-security.kubernetes.io/enforce"] in ["baseline", "restricted"]) ||
(has(object.metadata.labels) && "pod-security.kubernetes.io/audit" in object.metadata.labels && object.metadata.labels["pod-security.kubernetes.io/audit"] in ["baseline", "restricted"]) ||
(has(object.metadata.labels) && "pod-security.kubernetes.io/warn" in object.metadata.labels && object.metadata.labels["pod-security.kubernetes.io/warn"] in ["baseline", "restricted"])

Namespace must set one of pod-security.kubernetes.io/{enforce,audit,warn} to baseline or restricted.

Remediation

Label the namespace with pod-security.kubernetes.io/enforce set to baseline or restricted; an audit or warn label at those levels also satisfies the check but does not block workloads. Fields: metadata.labels["pod-security.kubernetes.io/enforce"], metadata.labels["pod-security.kubernetes.io/audit"], metadata.labels["pod-security.kubernetes.io/warn"].

Applies to

  • namespaces · v1 · CREATE, UPDATE

Manifest

apiVersion: admissionregistration.k8s.io/v1
kind: ValidatingAdmissionPolicy
metadata:
  name: namespace-pod-security-standards
  annotations:
    kubeapt.io/uuid: "00728e67-856f-45a1-9b84-7e34c2c8cf9e"
    security.kubeapt.io/displayName: "Sets No Pod Security Standards Label"
    security.kubeapt.io/description: "A namespace that is not held to at least the baseline Pod Security Standard lets anyone able to create pods there run privileged, host-networked or hostPath workloads and break out to the node unchallenged."
    security.kubeapt.io/resource: "Namespaces"
    security.kubeapt.io/severity: "Moderate"
    security.kubeapt.io/remediation: "Label the namespace with pod-security.kubernetes.io/enforce set to baseline or restricted; an audit or warn label at those levels also satisfies the check but does not block workloads. Fields: metadata.labels[\"pod-security.kubernetes.io/enforce\"], metadata.labels[\"pod-security.kubernetes.io/audit\"], metadata.labels[\"pod-security.kubernetes.io/warn\"]."
    security.kubeapt.io/product: "Kubernetes"
spec:
  failurePolicy: Fail
  matchConstraints:
    resourceRules:
    - apiGroups:
      - ''
      apiVersions:
      - v1
      operations:
      - CREATE
      - UPDATE
      resources:
      - namespaces
  validations:
  - expression: |
      (has(object.metadata.labels) && "pod-security.kubernetes.io/enforce" in object.metadata.labels && object.metadata.labels["pod-security.kubernetes.io/enforce"] in ["baseline", "restricted"]) ||
      (has(object.metadata.labels) && "pod-security.kubernetes.io/audit" in object.metadata.labels && object.metadata.labels["pod-security.kubernetes.io/audit"] in ["baseline", "restricted"]) ||
      (has(object.metadata.labels) && "pod-security.kubernetes.io/warn" in object.metadata.labels && object.metadata.labels["pod-security.kubernetes.io/warn"] in ["baseline", "restricted"])
    message: |
      Namespace must set one of pod-security.kubernetes.io/{enforce,audit,warn} to baseline or restricted.

Save it as namespace-pod-security-standards.yaml — the commands below assume that name.

Validate with kubeapt

Check a workload against this one policy, before anything is installed on a cluster.

$ kubeapt validate -p ./namespace-pod-security-standards.yaml -r ./workload.yaml

Or without the file, from the published policy set — -r takes a directory too:

$ kubeapt policies download && kubeapt validate --policy-name namespace-pod-security-standards -r ./manifests

Or against every namespace in the cluster your kubeconfig points at:

$ kubeapt validate --policy-name namespace-pod-security-standards -A

Bundles

Source

View policy.yaml on GitHub →