Peer auto TLS set to true

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Metadata

Id: kubernetes-peer-auto-tls-set-to-true

Platform: Kubernetes

Severity: Medium

Category: Networking and Firewall

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Description

When running etcd, the --peer-auto-tls flag must not be set to true; it should be set to false or omitted. This rule inspects containers and initContainers for etcd commands and flags set to --peer-auto-tls=true. Enabling peer auto TLS can cause certificates to be automatically accepted or generated for peers, potentially weakening cluster security, so explicit TLS configuration is required.

Compliant Code Examples

apiVersion: apps/v1
kind: Deployment
metadata:
  name: app-etcd-deployment
spec:
  selector:
    matchLabels:
      app: app
  replicas: 1
  template:
    metadata:
      labels:
        app: app
        version: v1
    spec:
      serviceAccountName: database
      containers:
      - name: database
        image: gcr.io/google_containers/etcd:v3.2.18
        imagePullPolicy: IfNotPresent
        command: ["etcd"]
        args: []
      nodeSelector:
        kubernetes.io/hostname: worker02  
    restartPolicy: OnFailure

apiVersion: apps/v1
kind: Deployment
metadata:
  name: app-etcd-deployment
spec:
  selector:
    matchLabels:
      app: app
  replicas: 1
  template:
    metadata:
      labels:
        app: app
        version: v1
    spec:
      serviceAccountName: database
      containers:
      - name: database
        image: gcr.io/google_containers/etcd:v3.2.18
        imagePullPolicy: IfNotPresent
        command: ["etcd", "--peer-auto-tls=false"]
        args: []
      nodeSelector:
        kubernetes.io/hostname: worker02  
    restartPolicy: OnFailure

Non-Compliant Code Examples

apiVersion: apps/v1
kind: Deployment
metadata:
  name: app-etcd-deployment
spec:
  selector:
    matchLabels:
      app: app
  replicas: 1
  template:
    metadata:
      labels:
        app: app
        version: v1
    spec:
      serviceAccountName: database
      containers:
      - name: database
        image: gcr.io/google_containers/etcd:v3.2.18
        imagePullPolicy: IfNotPresent
        command: ["etcd"]
        args: ["--peer-auto-tls=true"]
      nodeSelector:
        kubernetes.io/hostname: worker02  
    restartPolicy: OnFailure