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documentation_complete: true
title: 'Configure the kubelet Certificate File for the API Server'
{{% set default_jqfilter = '[.data."config.yaml" | fromjson | select(.apiServerArguments["kubelet-client-certificate"]) | .apiServerArguments["kubelet-client-certificate"][] | select(test("{{.var_apiserver_kubelet_client_cert}}"))]' %}}
{{% 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["kubelet-client-certificate"]) | .apiServerArguments["kubelet-client-certificate"][] | select(test("/etc/kubernetes/certs/kubelet/tls.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: |-
To enable certificate based kubelet authentication,
edit the <tt>config</tt> configmap in the <tt>openshift-kube-apiserver</tt>
namespace and set the below parameter in the <tt>config.yaml</tt> key if
it is not already configured:
<pre>
"apiServerArguments":{
...
"kubelet-client-certificate":"/etc/kubernetes/static-pod-resources/secrets/kubelet-client/tls.crt",
...
}
</pre>
rationale: |-
By default the API Server does not authenticate itself to the kubelet's
HTTPS endpoints. Requests from the API Server are treated anonymously.
Configuring certificate-based kubelet authentication ensures that the
API Server authenticates itself to kubelets when submitting requests.
identifiers:
cce@ocp4: CCE-84080-1
platform: not ocp4-on-hypershift-hosted
severity: high
references:
cis@ocp4: 1.2.5
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
srg: SRG-APP-000516-CTR-001325
ocil_clause: '<tt>kubelet-client-certificate</tt> is not set as appropriate in <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["kubelet-client-certificate"]'</pre>
The output should return <tt>/etc/kubernetes/static-pod-resources/secrets/kubelet-client/tls.crt</tt>
or <tt>/etc/kubernetes/static-pod-certs/secrets/kubelet-client/tls.crt</tt>
warnings:
- general: |-
{{{ openshift_filtered_cluster_setting({custom_api_path: dump_path}) | indent(4) }}}
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"
|
