Certificate authority is not unique

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Metadata

Id: kubernetes-not-unique-certificate-authority

Platform: Kubernetes

Severity: Medium

Category: Secret Management

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Description

The trusted certificate authority file used by etcd must be different from the client certificate authority file used by the API server. Do not set --trusted-ca-file for etcd to the same path as the API server’s --client-ca-file. Sharing the same CA file can allow clients authenticated to the API server to be implicitly trusted by etcd, weakening isolation and increasing risk.

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: ["--client-ca-file=/etc/env/valid.pem"]
  restartPolicy: OnFailure
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: database
spec:
  selector:
    matchLabels:
      app: database
      version: v1
  replicas: 1
  template:
    metadata:
      labels:
        app: database
        version: v1
    spec:
      serviceAccountName: database
      containers:
      - name: database
        image: gcr.io/google_containers/kube-apiserver:certification
        imagePullPolicy: IfNotPresent
        command: ["etcd"]
        args: ["--trusted-ca-file=/etc/env/valid2.pem"]
      nodeSelector:
        kubernetes.io/hostname: worker02  
    restartPolicy: OnFailure

Non-Compliant Code Examples

apiVersion: apps/v1
kind: Deployment
metadata:
  name: database
spec:
  selector:
    matchLabels:
      app: database
      version: v1
  replicas: 1
  template:
    metadata:
      labels:
        app: database
        version: v1
    spec:
      serviceAccountName: database
      containers:
      - name: database
        image: gcr.io/google_containers/kube-apiserver:certification
        imagePullPolicy: IfNotPresent
        command: ["etcd"]
        args: ["--trusted-ca-file=/etc/env/valid3.pem"]
      nodeSelector:
        kubernetes.io/hostname: worker02  
    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: ["--client-ca-file=/etc/env/valid3.pem"]
  restartPolicy: OnFailure