Ensure Secure Boot is enabled for Shielded GKE node pools

中レベル 2自動gke

説明

Enable Secure Boot for Shielded GKE node pools to verify the digital signature of node VM boot components, including the kernel and bootloader, during the boot process. Secure Boot helps ensure that only trusted boot components are allowed to run when the node starts. Requires gcloud with container.clusters.get; the cluster comes from GKE_CLUSTER and GKE_LOCATION (optional GKE_PROJECT, else the gcloud default project). Every node pool is checked.

チェック方法

監査方法: シェルコマンド

shell

out=$(gcloud container node-pools list --cluster "${GKE_CLUSTER:?set GKE_CLUSTER}" --location "${GKE_LOCATION:?set GKE_LOCATION}" ${GKE_PROJECT:+--project=$GKE_PROJECT} --format='value(name,config.shieldedInstanceConfig.enableSecureBoot)') || exit 1
bad=$(printf '%s\n' "$out" | awk -F '\t' 'NF && !($2=="True") {print $1 ": " $2}')
if [ -z "$bad" ]; then echo compliant; else printf '%s\n' "$bad"; 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

Create a replacement node pool with Secure Boot enabled for any node pool where the audit result is not true. Secure Boot is disabled by default for node pools and should be explicitly enabled when creating the replacement node pool. gcloud container node-pools create $POOL_NAME \ --cluster $CLUSTER_NAME \ --location $LOCATION \ --project $PROJECT_ID \ --shielded-secure-boot • Before migrating workloads, validate that Secure Boot will not block required boot components or node level dependencies. On Ubuntu nodes, Secure Boot blocks unsigned third party kernel modules from loading. Migrate workloads from the noncompliant node pool to the new Secure Boot enabled node pool, validate workload health, and then drain and delete the old node pool. After remediation, rerun the audit command and confirm that enableSecureBoot returns true.

プロパティ

オペレーティングシステム: すべて
タグ: gkemanaged-services
参照: CIS Google Kubernetes Engine (GKE) Benchmark v2.0.0 - 5.5.7 Ensure Secure Boot is enabled for Shielded GKE node pools

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 gke --level 2