Minimize the admission of containers wishing to share the host network namespace

高レベル 1自動oke

説明

Minimize the admission of pods that request spec.hostNetwork: true in OKE so that sharing the host network namespace is limited to tightly controlled, explicitly approved platform scenarios. In OKE, this is done through Pod Security Admission or an equivalent policy engine. Because the baseline profile prohibits hostNetwork, and restricted inherits the baseline restrictions, general workload namespaces should not permit host network sharing. Requires kubectl with cluster-wide read access (KUBECONFIG); system namespaces are excluded and listed resources must be remediated or documented as exceptions.

チェック方法

監査方法: シェルコマンド

shell

out=$(kubectl get pods -A -o go-template='{{range .items}}{{.metadata.namespace}} {{.metadata.name}} {{.spec.hostNetwork}}{{"\n"}}{{end}}') || exit 1
bad=$(printf '%s\n' "$out" | awk -v ex='^(kube-system|kube-public|kube-node-lease)$' 'NF && $1 !~ ex && ($3=="true")')
if [ -z "$bad" ]; then echo compliant; else printf '%s\n' "$bad" | head -n 25; fi

期待される出力: compliant

修正方法

修正方法: ガイダンスまたは IaC パッチ

Configure Pod Security Admission on workload namespaces so pods that request spec.hostNetwork: true are denied at admission time. Use enforce on workload namespaces with restricted, or at minimum baseline, and reserve any exceptions for narrowly approved platform workloads. After updating namespace enforcement, remove hostNetwork: true from affected manifests and redeploy those workloads so new pods are evaluated under the enforced policy. For this control, the baseline and restricted Pod Security Standards disallow hostNetwork, while restricted is typically the stronger choice for user workloads. Label each workload namespace to enforce restricted. kubectl label ns NAMESPACE pod-security.kubernetes.io/enforce=restricted --overwrite Add warn and audit during rollout if you want visibility into violations, but do not rely on them for remediation because they do not block pod creation.

プロパティ

オペレーティングシステム: すべて
タグ: okepoliciespod-securitynetwork
参照: CIS Oracle Cloud Infrastructure Container Engine for Kubernetes (OKE) Benchmark v2.0.0 - 4.2.4 Minimize the admission of containers wishing to share the host network namespace

このホストをチェック

監査が許可されているマシンで実行してください。スキャンは読み取り専用です。

shell

tmaegis scan --target oke