cis-k8s-v1110-1.2.24

DevOps & Security

Ensure that the --tls-cert-file and --tls-private-key-file arguments are set as appropriate (Automated)

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1.2.24 Ensure that the --tls-cert-file and --tls-private-key-file arguments are set as appropriate (Automated)

Profile Applicability

Level 1 - Master Node

Description

Setup TLS connection on the API server.

Rationale

API server communication contains sensitive parameters that should remain encrypted in transit. Configure the API server to serve only HTTPS traffic.

Impact

TLS and client certificate authentication must be configured for your Kubernetes cluster deployment.

Audit

Run the following command on the Control Plane node:

ps -ef | grep kube-apiserver

Verify that the --tls-cert-file and --tls-private-key-file arguments exist and they are set as appropriate.

Remediation

Follow the Kubernetes documentation and set up the TLS connection on the apiserver. Then, edit the API server pod specification file /etc/kubernetes/manifests/kube-apiserver.yaml on the master node and set the TLS certificate and private key file parameters.

--tls-cert-file=<path/to/tls-certificate-file>
--tls-private-key-file=<path/to/tls-key-file>

Default Value

By default, --tls-cert-file and --tls-private-key-file are presented and created for use.

References

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	3.10 Encrypt Sensitive Data in Transit		*	*
v7	14.4 Encrypt All Sensitive Information in Transit		*	*