Kubelet certificate authority not set

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Metadata

Id: ec18a0d3-0069-4a58-a7fb-fbfe0b4bbbe0

Cloud Provider: Kubernetes

Platform: Kubernetes

Severity: Medium

Category: Secret Management

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Description

When using kube-apiserver, the --kubelet-certificate-authority flag should be set. The rule checks containers and initContainers for commands that include kube-apiserver and reports when the --kubelet-certificate-authority flag is not present. Setting this flag ensures the API server uses the kubelet’s certificate authority to validate kubelet TLS connections.

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: ["--kubelet-certificate-authority=/path/to/any/cert/file.pem"]
  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","--kubelet-certificate-authority=/path/to/any/cert/file.crt"]
      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"]
  restartPolicy: OnFailure