M-101_host_namespaces.yml

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# https://kubernetes.io/docs/concepts/security/pod-security-standards/#baseline
# https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/pod-security-admission/policy/check_hostNamespaces.go
# https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/pod-security-admission/policy/check_hostNamespaces_test.go
id: M-101
slug: host-namespaces
severity: High
message: "Host namespaces"
match:
  resources:
    - group: ""
      version: v1
      resource: pods
    - group: apps
      version: v1
      resource: deployments
    - group: apps
      version: v1
      resource: daemonsets
    - group: apps
      version: v1
      resource: statefulsets
    - group: apps
      version: v1
      resource: replicasets
    - group: batch
      version: v1
      resource: cronjobs
    - group: batch
      version: v1
      resource: jobs
validations:
  - expression: >
      podSpec.?hostNetwork.orValue(false) == false &&
      podSpec.?hostPID.orValue(false) == false &&
      podSpec.?hostIPC.orValue(false) == false
    message: "Pod sharing host namespace"