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documentation_complete: true
title: 'Configure the etcd Certificate for the API Server'
{{% set default_jqfilter = '.data."config.yaml" | fromjson' %}}
{{% set default_api_path = '/api/v1/namespaces/openshift-kube-apiserver/configmaps/config' %}}
{{% set hypershift_path = '/api/v1/namespaces/{{.hypershift_namespace_prefix}}-{{.hypershift_cluster}}/configmaps/kas-config' %}}
{{% set hypershift_jqfilter = '.data."config.json" | fromjson' %}}
{{% set custom_api_path = '{{if ne .hypershift_cluster "None"}}' ~ hypershift_path ~ '{{else}}' ~ default_api_path ~ '{{end}}' %}}
{{% set custom_jqfilter = '{{if ne .hypershift_cluster "None"}}' ~ hypershift_jqfilter ~ '{{else}}' ~ default_jqfilter ~ '{{end}}' %}}
{{% set dump_path = default_api_path ~ ',' ~ default_jqfilter ~ ',' ~ custom_jqfilter %}}
description: |-
To ensure etcd is configured to make use of TLS encryption for client
communications, follow the OpenShift documentation and setup the TLS
connection between the API Server and etcd. Then, verify
that <tt>apiServerArguments</tt> has the <tt>etcd-certfile</tt> configured in
the <tt>openshift-kube-apiserver</tt> configmap to something similar to:
<pre>
...
"etcd-certfile": [
"/etc/kubernetes/static-pod-resources/secrets/etcd-client/tls.crt"
],
...
</pre>
rationale: |-
etcd is a highly-available key-value store used by OpenShift deployments
for persistent storage of all REST API objects. These objects are sensitive
in nature and should be protected by client authentication. This requires the
API Server to identify itself to the etcd server using a client certificate
and key.
identifiers:
cce@ocp4: CCE-83876-3
severity: medium
references:
cis@ocp4: 1.2.27
nerc-cip: CIP-003-8 R4.2,CIP-003-8 R6,CIP-004-6 R3,CIP-007-3 R5.1,CIP-007-3 R6.1
nist: CM-6,CM-6(1),SC-8,SC-8(1)
pcidss: Req-2.2,Req-2.2.3,Req-2.3
srg: SRG-APP-000516-CTR-001325
platform: not ocp4-on-hypershift-hosted
ocil_clause: '<tt>etcd-certfile</tt> does not exist or is not configured to valid certificates'
ocil: |-
Run the following command:
<pre>$ oc get configmap config -n openshift-kube-apiserver -ojson | jq -r '.data["config.yaml"]' | jq -r '.apiServerArguments."etcd-certfile"'</pre>
The output should return a configured certificate file.
warnings:
- general: |-
{{{ openshift_filtered_cluster_setting({custom_api_path: dump_path}) | indent(4) }}}
template:
name: yamlfile_value
vars:
ocp_data: "true"
entity_check: "all"
filepath: {{{ openshift_filtered_path(default_api_path, default_jqfilter) }}}
yamlpath: '.apiServerArguments["etcd-certfile"][:]'
values:
- value: '.*\.crt'
operation: "pattern match"
type: "string"
|
