Always admit admission control plugin set

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Metadata

Id: ce30e584-b33f-4c7d-b418-a3d7027f8f60

Cloud Provider: Kubernetes

Platform: Kubernetes

Severity: Medium

Category: Access Control

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Description

When the kube-apiserver command is present, the --enable-admission-plugins flag should not include the AlwaysAdmit plugin. This rule identifies containers and initContainers running kube-apiserver and flags resources whose --enable-admission-plugins flag contains AlwaysAdmit. The AlwaysAdmit plugin bypasses admission control and allows requests without validation, so it should not be used in production.

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: []
  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=EventRateLimit", "--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", "--admission-control-config-file=path/to/plugin/config/file.yaml"]
  restartPolicy: OnFailure