cis-ocp-v170-1-2-22

name	cis-ocp-v170-1.2.22
description	Ensure that the maximumRetainedFiles argument is set to 10 or as appropriate (Manual)
category	cis-openshift
version	1.7.0
author	cyberstrike-official
tags	["cis","openshift","kubernetes","redhat","control-plane","api-server"]
cis_id	1.2.22
cis_benchmark	CIS Red Hat OpenShift Container Platform Benchmark v1.7.0
tech_stack	["kubernetes","openshift","redhat"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

CIS Red Hat OpenShift Container Platform Benchmark v1.7.0 - Control 1.2.22

Profile Applicability

• Level: 1

Description

Retain 10 or an appropriate number of old log files.

Rationale

Kubernetes automatically rotates the log files. Retaining old log files ensures that you would have sufficient log data available for carrying out any investigation or correlation. For example, if you have set file size of 100 MB and the number of old log files to keep as 10, you would have approximately 1 GB of log data that you could potentially use for your analysis.

Impact

None.

Audit Procedure

OpenShift audit works at the API server level, logging all requests coming to the server.

Run the following command to verify the number of retained log files:

oc get configmap config -n openshift-kube-apiserver -ojson | jq -r '.data["config.yaml"]' | jq -r '.apiServerArguments["audit-log-maxbackup"][]?'

Verify the output is at least 10.

Remediation

None.

Default Value

By default, auditing is enabled and the maximum audit log backup is set to 10.

References

1. https://access.redhat.com/solutions/4262201
2. https://docs.openshift.com/container-platform/latest/security/audit-log-policy-config.html
3. https://github.com/openshift/cluster-kube-apiserver-operator/blob/master/bindata/v4.1.0/config/defaultconfig.yaml#L165-168
4. https://github.com/openshift/cluster-authentication-operator/blob/master/bindata/oauth-apiserver/deploy.yaml
5. https://kubernetes.io/docs/reference/command-line-tools-reference/kube-apiserver/
6. https://kubernetes.io/docs/tasks/debug-application-cluster/audit/
7. https://github.com/kubernetes/features/issues/22
8. https://kubernetes.io/docs/reference/command-line-tools-reference/kube-apiserver/