Ensure that the --kubelet-client-certificate and --kubelet-client-key arguments are set as appropriate (API Server)

Risk Level: High
Cloud Entity: Pods
CloudGuard Rule ID: D9.K8S.IAM.07
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 'kubelet-client-certificate' ]) and (parsedArgs contain [key like 'kubelet-client-key' ])]

REMEDIATION

Follow the Kubernetes documentation and set up the TLS connection between the
apiserver and kubelets. Then, edit API server pod specification file
$apiserverconf on the master node and set the
kubelet client certificate and key parameters as below.
--kubelet-client-certificate=<path/to/client-certificate-file>
--kubelet-client-key=<path/to/client-key-file>

References

1. https://kubernetes.io/docs/admin/kube-apiserver/
2. https://kubernetes.io/docs/admin/kubelet-authentication-authorization/
3. https://kubernetes.io/docs/concepts/cluster-administration/master-node-communication/#apiserver---kubelet

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