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documentation_complete: true
title: 'Ensure that the admission control plugin SecurityContextDeny is set if PodSecurityPolicy is not used'
{{% 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: |-
Instead of using a customized SecurityContext for pods, a Pod Security
Policy (PSP) or a SecurityContextConstraint should be used. These are
cluster-level resources that control the actions that a pod can perform
and what resource the pod may access. The <tt>SecurityContextDeny</tt>
disallows folks from setting a pod's <tt>securityContext</tt> fields.
Ensure that the list of admission controllers does not include
SecurityContextDeny:
<pre>$ oc -n openshift-kube-apiserver get configmap config -o json | jq -r '.data."config.yaml"' | jq '.apiServerArguments."enable-admission-plugins"' </pre>
rationale: |-
The <tt>SecurityContextDeny</tt> admission control plugin disallows
setting any security options for your pods. <tt>SecurityContextConstraints</tt>
allow you to enforce RBAC rules on who can set these options on the pods, and
what they're allowed to set. Thus, using the <tt>SecurityContextDeny</tt>
will deter you from enforcing granular permissions on your pods.
identifiers:
cce@ocp4: CCE-83586-8
severity: medium
references:
cis@ocp4: 1.2.13
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>SecurityContextDeny</tt>'
ocil: |-
The SecurityContextDeny plugin should not be enabled in the list of enabled plugins in the apiserver configuration:
<pre>$ oc -n openshift-kube-apiserver get configmap config -o json | jq -r '.data."config.yaml"' | jq '.apiServerArguments."enable-admission-plugins"' </pre>
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: '^SecurityContextDeny$'
operation: "pattern match"
|
