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documentation_complete: true
title: 'Configure the Client Certificate Authority for the API Server'
{{% set default_jqfilter = '[.data."config.yaml" | fromjson | select(.apiServerArguments["client-ca-file"]) | .apiServerArguments["client-ca-file"][] | select(test("{{.var_apiserver_client_ca}}"))]' %}}
{{% 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 | select(.apiServerArguments["client-ca-file"]) | .apiServerArguments["client-ca-file"][] | select(test("/etc/kubernetes/certs/client-ca/ca.crt"))]' %}}
{{% 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: |-
Certificates must be provided to fully setup TLS client certificate
authentication. To ensure the API Server utilizes its own TLS certificates, the
<tt>clientCA</tt> must be configured. Verify
that <tt>servingInfo</tt> has the <tt>clientCA</tt> configured in
the <tt>openshift-kube-apiserver</tt> <tt>config</tt> configmap
to something similar to:
<pre>
"apiServerArguments": {
...
"client-ca-file": [
"/etc/kubernetes/static-pod-certs/configmaps/client-ca/ca-bundle.crt"
],
...
</pre>
rationale: |-
API Server communication contains sensitive parameters that should remain
encrypted in transit. Configure the API Server to serve only HTTPS traffic.
If <tt>-clientCA</tt> is set, any request presenting a client
certificate signed by one of the authorities in the <tt>client-ca-file</tt>
is authenticated with an identity corresponding to the <i>CommonName</i> of
the client certificate.
severity: medium
references:
cis@ocp4: 1.2.29
nerc-cip: CIP-003-8 R4.2,CIP-007-3 R5.1
nist: SC-8,SC-8(1),SC-8(2)
pcidss: Req-2.2,Req-2.2.3,Req-2.3
srg: SRG-APP-000441-CTR-001090,SRG-APP-000442-CTR-001095
identifiers:
cce@ocp4: CCE-84284-9
platform: not ocp4-on-hypershift-hosted
ocil_clause: '<tt>client-ca-file</tt> is not set as appropriate for <tt>apiServerArguments</tt>'
ocil: |-
Run the following command:
<pre>$ oc get configmap config -n openshift-kube-apiserver -ojson | jq -r '.data["config.yaml"]' | jq '.apiServerArguments["client-ca-file"]'</pre>
The output should return a configured TLS CA certificate file.
warnings:
- general: |-
{{{ openshift_filtered_cluster_setting({custom_api_path: dump_path}) | indent(8) }}}
template:
name: yamlfile_value
vars:
ocp_data: "true"
filepath: {{{ openshift_filtered_path(default_api_path, default_jqfilter) }}}
yamlpath: "[:]"
check_existence: "at_least_one_exists"
entity_check: "all"
values:
- value: "(.*?)"
operation: "pattern match"
|
