Ensure that the --authorization-mode argument is not set to AlwaysAllow (API Server)

Risk Level: High
Cloud Entity: Pods
CloudGuard Rule ID: D9.K8S.NET.12
Covered by Spectral: Yes
Category: Compute

GSL LOGIC

KubernetesPod where labels contain [value='kube-apiserver'] and namespace = 'kube-system' should have spec.containers with [parsedArgs contain [key like 'authorization-mode' and value unlike '%AlwaysAllow%']]

REMEDIATION

Edit the API server pod specification file $apiserverconf
on the master node and set the --authorization-mode parameter to
values other than AlwaysAllow. One such example could be as below.
--authorization-mode=RBAC

References

1. https://kubernetes.io/docs/admin/kube-apiserver/
2. https://kubernetes.io/docs/admin/authorization/

Pods

Pods are the smallest deployable units of computing that can be created and managed in Kubernetes.A Pod is a group of one or more containers (such as Docker containers), with shared storage/network, and a specification for how to run the containers.

Compliance Frameworks

• CIS Kubernetes Benchmark v1.20
• CIS Kubernetes Benchmark v1.23
• CIS Kubernetes Benchmark v1.24
• CIS Kubernetes Benchmark v1.4.0
• CIS Kubernetes Benchmark v1.5.1
• CIS Kubernetes Benchmark v1.6.1
• Kubernetes NIST.SP.800-190
• Kubernetes v.1.13 CloudGuard Best Practices
• Kubernetes v.1.14 CloudGuard Best Practices