← Policy catalog
</> ValidatingAdmissionPolicy · Apache-2.0

Is Backed by a Node-Local hostPath Volume

persistentvolume-hostpath

severityHigh resourcePersistentVolumes productKubernetes bundles1

A hostPath or local PersistentVolume hands pods a path on the node filesystem, so any workload that binds the claim can read or tamper with kubelet credentials and other tenants' data.

Rejects unless

!has(object.spec.hostPath) && !has(object.spec.local)

PersistentVolumes must not be backed by a node-local hostPath or local volume.

Remediation

Back the volume with a CSI or network storage source and remove the node-local source. Fields: spec.hostPath, spec.local.

Applies to

  • persistentvolumes · v1 · CREATE, UPDATE

Manifest

apiVersion: admissionregistration.k8s.io/v1
kind: ValidatingAdmissionPolicy
metadata:
  name: persistentvolume-hostpath
  annotations:
    kubeapt.io/uuid: "fbbade48-edc3-4fc9-9285-32924d2c5e4b"
    security.kubeapt.io/displayName: "Is Backed by a Node-Local hostPath Volume"
    security.kubeapt.io/description: "A hostPath or local PersistentVolume hands pods a path on the node filesystem, so any workload that binds the claim can read or tamper with kubelet credentials and other tenants' data."
    security.kubeapt.io/resource: "PersistentVolumes"
    security.kubeapt.io/severity: "High"
    security.kubeapt.io/remediation: "Back the volume with a CSI or network storage source and remove the node-local source. Fields: spec.hostPath, spec.local."
    security.kubeapt.io/product: "Kubernetes"
spec:
  failurePolicy: Fail
  matchConstraints:
    resourceRules:
    - apiGroups:
      - ''
      apiVersions:
      - v1
      operations:
      - CREATE
      - UPDATE
      resources:
      - persistentvolumes
  validations:
  - expression: |
      !has(object.spec.hostPath) && !has(object.spec.local)
    message: |
      PersistentVolumes must not be backed by a node-local hostPath or local volume.

Save it as persistentvolume-hostpath.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 ./persistentvolume-hostpath.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 persistentvolume-hostpath -r ./manifests

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

$ kubeapt validate --policy-name persistentvolume-hostpath -A

Bundles

Source

View policy.yaml on GitHub →