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documentation_complete: true
title: 'Enable the NodeRestriction Admission Control Plugin'
{{% 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 limit the <tt>Node</tt> and <tt>Pod</tt> objects that a kubelet could modify,
ensure that the <tt>NodeRestriction</tt> plugin on kubelets is enabled in
the api-server configuration by running the following command:
<pre>$ oc -n openshift-kube-apiserver get configmap config -o json | jq -r '.data."config.yaml"' | jq '.apiServerArguments."enable-admission-plugins"'</pre>
rationale: |-
Using the <tt>NodeRestriction</tt> plugin ensures that the kubelet is
restricted to the <tt>Node</tt> and <tt>Pod</tt> objects that it could
modify as defined. Such kubelets will only be allowed to modify their
own <tt>Node</tt> API object, and only modify <tt>Pod</tt> API objects
that are bound to their node.
identifiers:
cce@ocp4: CCE-83753-4
severity: medium
references:
cis@ocp4: 1.2.15
nerc-cip: CIP-003-8 R6,CIP-004-6 R3,CIP-007-3 R6.1
nist: CM-6,CM-6(1)
pcidss: Req-2.2
srg: SRG-APP-000516-CTR-001325
platform: not ocp4-on-hypershift-hosted
ocil_clause: '<tt>enable-admission-plugins</tt> does not contain <tt>NodeRestriction</tt>'
ocil: |-
Ensure that the NodeRestriction plugin is enabled in the list of enabled plugins in
the apiserver configuration by running the following command:
<pre>$ oc get configmap config -n openshift-kube-apiserver -ojson | jq -r '.data["config.yaml"]' | grep 'NodeRestriction'</pre>
warnings:
- general: |-
{{{ openshift_filtered_cluster_setting({custom_api_path: dump_path}) | indent(4) }}}
template:
name: yamlfile_value
vars:
ocp_data: "true"
entity_check: "at least one"
filepath: {{{ openshift_filtered_path(default_api_path, default_jqfilter) }}}
yamlpath: '.apiServerArguments["enable-admission-plugins"][:]'
values:
- value: '^NodeRestriction$'
operation: "pattern match"
entity_check: "at least one"
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