Ensure that the --client-ca-file argument is set as appropriate

HighLevel 1Automatedopenshift

Description

Enable Kubelet authentication using certificates. Reads every node's effective kubelet configuration with oc get --raw /api/v1/nodes/<node>/proxy/configz; requires a cluster-admin oc login. Every node must use /etc/kubernetes/kubelet-ca.crt.

How it is checked

Audit method: Shell command

shell

nodes=$(oc get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\n"}{end}') || exit 1
[ -n "$nodes" ] || exit 1
ok=1
for n in $nodes; do
  c=$(oc get --raw "/api/v1/nodes/$n/proxy/configz") || exit 1
  if ! { printf '%s' "$c" | grep -Eq '"clientCAFile":"/etc/kubernetes/kubelet-ca.crt"'; }; then echo "noncompliant: $n"; ok=0; fi
done
if [ "$ok" -eq 1 ]; then echo compliant; fi

Expected output: compliant

How it is fixed

Fix method: Guidance or infrastructure patch

Set -client-ca-file argument to the appropriate location.

Properties

Operating systems: Any
Tags: openshiftworker-node
Reference: CIS Red Hat OpenShift Container Platform Benchmark v2.0.0 - 4.2.4 Ensure that the --client-ca-file argument is set as appropriate

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

shell

tmaegis scan --target openshift