etcd TLS certificate not properly configured

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Metadata

Id: kubernetes-etcd-tls-certificate-not-properly-configured

Platform: Kubernetes

Severity: Medium

Category: Networking and Firewall

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Description

When using kube-apiserver, the --etcd-certfile and --etcd-keyfile flags should be set. The rule checks containers and initContainers for containers whose command includes kube-apiserver and reports a MissingAttribute issue when either flag is not defined.

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: ["--etcd-keyfile=/path/to/key/file.key","--etcd-certfile=/path/to/cert/file.crt"]
  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","--etcd-keyfile=/path/to/key/file.key","--etcd-certfile=/path/to/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"]
      args: ["--etcd-keyfile=/path/to/key/file.key"]
  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: ["--etcd-certfile=/path/to/cert/file.crt"]
  restartPolicy: OnFailure