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

高レベル 1自動aks

説明

Minimize the admission of pods that request spec.hostNetwork=true so that only tightly controlled, explicitly approved platform workloads can share the host network namespace in AKS. As it relates to RBAC and service accounts, this means users, groups, and service accounts with pod or controller deployment rights should not broadly be able to create or update workloads that use host networking, because AKS relies on Kubernetes RBAC to scope who ... 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' "$out" | awk -v ex='^(kube-system|kube-public|kube-node-lease|gatekeeper-system|azure-arc)$' '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

Add policies to each namespace in the cluster which has user workloads to restrict the admission of hostNetwork containers. Pod Security Policies and Assignments can be found by searching for Policies in the Azure Portal. A detailed step-by-step guide can be found here: https://learn.microsoft.com/en-us/azure/governance/policy/concepts/policy-for-kubernetes

プロパティ

オペレーティングシステム: すべて
タグ: akspoliciespod-securitynetwork
参照: CIS Azure Kubernetes Service (AKS) 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 aks