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"
