TMA-GKE-4.3.2

Define default deny NetworkPolicies for each workload namespace

中レベル 2自動gke

説明

Use NetworkPolicy objects to define default deny traffic controls for each GKE workload namespace, then add explicit allow rules for approved pod, service, namespace, ingress, and egress communication paths. GKE uses NetworkPolicy enforcement to create pod level firewall rules that control which Pods and Services can communicate inside the cluster. Requires gcloud with container.clusters.get; the cluster comes from GKE_CLUSTER and GKE_LOCATION (optional GKE_PROJECT, else the gcloud default project). Checks NetworkPolicy enforcement (Dataplane V2, or Calico with the add-on enabled), as in the benchmark audit; default-deny policies per namespace still need review.

チェック方法

監査方法: シェルコマンド

shell

out=$(gcloud container clusters describe "${GKE_CLUSTER:?set GKE_CLUSTER}" --location "${GKE_LOCATION:?set GKE_LOCATION}" ${GKE_PROJECT:+--project=$GKE_PROJECT} --format='value(networkConfig.datapathProvider,networkPolicy.enabled,networkPolicy.provider,addonsConfig.networkPolicyConfig.disabled)') || exit 1
set -- $(printf '%s' "$out" | tr '\t' ' ')
if [ "${1:-}" = ADVANCED_DATAPATH ]; then echo compliant
elif [ "${2:-}" = True ] && [ "${3:-}" = CALICO ] && [ "${4:-False}" != True ]; then echo compliant
else echo "noncompliant: $out"; 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

For noncompliant GKE Standard clusters, update the cluster build standard so a supported NetworkPolicy enforcement option is selected during cluster creation. Use GKE Dataplane V2 where possible, or Calico based NetworkPolicy enforcement where Dataplane V2 is not used. GKE Dataplane V2 is selected only during cluster creation, and existing clusters cannot be upgraded to use it. • Select GKE Dataplane V2 when creating new or replacement GKE Standard clusters, because NetworkPolicy enforcement is built into Dataplane V2. • For legacy datapath clusters, enable Calico based NetworkPolicy enforcement by enabling both the NetworkPolicy add-on and node enforcement. • Plan remediation during an approved maintenance window because enabling Calico based enforcement on existing legacy datapath clusters recreates nodes and can disrupt running workloads.

プロパティ

オペレーティングシステム: すべて
タグ: gkepoliciesnetwork
参照: CIS Google Kubernetes Engine (GKE) Benchmark v2.0.0 - 4.3.2 Define default deny NetworkPolicies for each workload 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 gke --level 2