Service account admission control plugin disabled

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Metadata

Id: 9587c890-0524-40c2-9ce2-663af7c2f063

Cloud Provider: k8s

Platform: Kubernetes

Severity: Medium

Category: Access Control

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Description

When kube-apiserver is used, the --disable-admission-plugins flag should not include the ServiceAccount plugin. Disabling the ServiceAccount admission plugin prevents the API server from admitting service account tokens and can break pod authentication and credential provisioning. This rule detects kube-apiserver containers and examines the container command for the --disable-admission-plugins flag containing ServiceAccount.

Compliant Code Examples

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
      command: ["kube-apiserver"]
      args: ["--enable-admission-plugins=ServiceAccount", "--admission-control-config-file=path/to/plugin/config/file.yaml"]
  restartPolicy: OnFailure

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
      command: ["kube-apiserver"]
      args: []
  restartPolicy: OnFailure

Non-Compliant Code Examples

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
      command: ["kube-apiserver","--disable-admission-plugins=ServiceAccount"]
      args: []
  restartPolicy: OnFailure

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
      command: ["kube-apiserver"]
      args: ["--disable-admission-plugins=ServiceAccount"]
  restartPolicy: OnFailure