← Policy catalog
</> ValidatingAdmissionPolicy · Apache-2.0

Sets a Custom SELinux Role

pod-selinux-role

severityModerate resourcePods productKubernetes bundles2

A custom SELinux role label applied pod-wide lets containers transition into domains outside the confined container role, weakening the mandatory access control that keeps a compromised process away from host files and devices.

Rejects unless

!has(object.spec.securityContext) || !has(object.spec.securityContext.seLinuxOptions) || !has(object.spec.securityContext.seLinuxOptions.role) || object.spec.securityContext.seLinuxOptions.role == ""

spec.securityContext.seLinuxOptions.role must be undefined or an empty string ("").

Remediation

Remove the pod-level seLinuxOptions.role setting or leave it as an empty string so the runtime assigns its default container role. Field: spec.securityContext.seLinuxOptions.role.

Applies to

  • pods · v1 · CREATE, UPDATE

Manifest

apiVersion: admissionregistration.k8s.io/v1
kind: ValidatingAdmissionPolicy
metadata:
  name: pod-selinux-role
  annotations:
    kubeapt.io/uuid: "7ee786ba-34bf-43d1-8873-cb16afbe89af"
    security.kubeapt.io/displayName: "Sets a Custom SELinux Role"
    security.kubeapt.io/description: "A custom SELinux role label applied pod-wide lets containers transition into domains outside the confined container role, weakening the mandatory access control that keeps a compromised process away from host files and devices."
    security.kubeapt.io/resource: "Pods"
    security.kubeapt.io/severity: "Moderate"
    security.kubeapt.io/remediation: "Remove the pod-level seLinuxOptions.role setting or leave it as an empty string so the runtime assigns its default container role. Field: spec.securityContext.seLinuxOptions.role."
    security.kubeapt.io/product: "Kubernetes"
spec:
  failurePolicy: Fail
  matchConstraints:
    resourceRules:
    - apiGroups:
      - ''
      apiVersions:
      - v1
      operations:
      - CREATE
      - UPDATE
      resources:
      - pods
  validations:
  - expression: |
      !has(object.spec.securityContext) || !has(object.spec.securityContext.seLinuxOptions) || !has(object.spec.securityContext.seLinuxOptions.role) || object.spec.securityContext.seLinuxOptions.role == ""
    message: |
      spec.securityContext.seLinuxOptions.role must be undefined or an empty string ("").

Save it as pod-selinux-role.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 ./pod-selinux-role.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 pod-selinux-role -r ./manifests

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

$ kubeapt validate --policy-name pod-selinux-role -A

Bundles

Source

View policy.yaml on GitHub →