Pod security policy admission control plugin not set

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Metadata

Id: kubernetes-pod-security-policy-admission-control-plugin-not-set

Platform: Kubernetes

Severity: High

Category: Build Process

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Description

When a kube-apiserver container is present (in containers or initContainers), the --enable-admission-plugins flag should include PodSecurityPolicy. The rule inspects the container command for kube-apiserver and reports a MissingAttribute if the flag does not contain PodSecurityPolicy. The admission control configuration file should also be correctly configured to enable the plugin.

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=PodSecurityPolicy", "--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","--enable-admission-plugins=PodSecurityPolicy", "--admission-control-config-file=path/to/plugin/config/file.yaml"]
      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: ["--enable-admission-plugins=AlwaysAdmit"]
  restartPolicy: OnFailure