documentation_complete: true


title: 'Disable the AlwaysAdmit 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 ensure OpenShift only responses to requests explicitly allowed by the
    admission control plugin. Check that the <code>config</code> ConfigMap object does not
    contain the AlwaysAdmit plugin.

rationale: |-
    Enabling the admission control plugin <tt>AlwaysAdmit</tt> allows all
    requests and does not provide any filtering.

identifiers:
  cce@ocp4: CCE-84148-6


severity: medium

references:
    cis@ocp4: 1.2.10
    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>AlwaysAdmit</tt> admission control plugin is not set'

ocil: |-
    To verify that the <tt>AlwaysAdmit</tt> admission control plugin is not set, run 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>
    The output should not contain <tt>AlwaysAdmit</tt>

warnings:
- general: |-
    {{{ openshift_filtered_cluster_setting({custom_api_path: dump_path}) | indent(4) }}}

template:
  name: yamlfile_value
  vars:
    ocp_data: "true"
    check_existence: "none_exist"
    filepath: {{{ openshift_filtered_path(default_api_path, default_jqfilter) }}}
    yamlpath: '.apiServerArguments["enable-admission-plugins"][:]'
    values:
    - value: '^AlwaysAdmit$'
      operation: "pattern match"
