Ensure that default service accounts are not actively used

Cara pemeriksaan

Metode audit: Perintah shell

sa=$(kubectl get serviceaccounts -A -o go-template='{{range .items}}{{if eq .metadata.name "default"}}{{.metadata.namespace}} {{.automountServiceAccountToken}}{{"\n"}}{{end}}{{end}}') || exit 1
rb=$(kubectl get rolebindings,clusterrolebindings -A -o go-template='{{range .items}}{{$b:=.metadata.name}}{{$bn:=.metadata.namespace}}{{range .subjects}}{{if eq .kind "ServiceAccount"}}{{if eq .name "default"}}{{if .namespace}}{{.namespace}}{{else}}{{$bn}}{{end}} {{$b}}{{"\n"}}{{end}}{{end}}{{end}}{{end}}') || exit 1
bad=$(printf '%s\n' "$sa" | awk -v ex='^(kube-system|kube-public|kube-node-lease|gmp-system|gmp-public|gke-[a-z0-9-]+)$' 'NF && $1 !~ ex && $2!="false" {print "automount: " $1}')
bad2=$(printf '%s\n' "$rb" | awk -v ex='^(kube-system|kube-public|kube-node-lease|gmp-system|gmp-public|gke-[a-z0-9-]+)$' 'NF && $1 !~ ex {print "binding: " $0}')
if [ -z "$bad$bad2" ]; then echo compliant; else printf '%s\n%s\n' "$bad" "$bad2" | grep . | head -n 25; fi

Output yang diharapkan

compliant

Cara perbaikan

Metode perbaikan: Panduan atau patch infrastruktur

Each workload that requires Kubernetes API access should have its own service account with narrowly defined permissions. Workloads that do not need Kubernetes API access should disable automatic token mounting to reduce unnecessary credential exposure. For Google Cloud API access, use Workload Identity Federation for GKE instead of relying on static credentials in Pods. • Create dedicated Kubernetes service accounts for workloads that require Kubernetes API access • Update workload manifests to specify serviceAccountName instead of relying on the namespace default service account • Remove RoleBinding and ClusterRoleBinding assignments from the default service account that are not needed • Set automountServiceAccountToken=false for Pods that do not need to communicate with the Kubernetes API server • Configure the namespace default service account with automountServiceAccountToken: false ...

Periksa host ini

Jalankan ini pada mesin yang diizinkan untuk Anda audit. Pemindaian bersifat hanya baca.

tmaegis scan --target gke