documentation_complete: true


title: 'Configure the Certificate for the API Server'

{{% set default_jqfilter = '[.data."config.yaml" | fromjson | select(.apiServerArguments["tls-cert-file"]) | .apiServerArguments["tls-cert-file"][] | select(test("{{.var_apiserver_tls_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["tls-cert-file"]) | .apiServerArguments["tls-cert-file"][] | select(test("/etc/kubernetes/certs/server/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 ensure the API Server utilizes its own TLS certificates, the
    <tt>tls-cert-file</tt> must be configured. Verify
    that the <tt>apiServerArguments</tt> section has the <tt>tls-cert-file</tt> configured in
    the <tt>config</tt> configmap in the <tt>openshift-kube-apiserver</tt> namespace
    similar to:
    <pre>
    "apiServerArguments":{
    ...
    "tls-cert-file": [
      "/etc/kubernetes/static-pod-certs/secrets/service-network-serving-certkey/tls.crt"
    ],
    ...
    }
    </pre>

rationale: |-
    API Server communication contains sensitive parameters that should remain
    encrypted in transit. Configure the API Server to serve only HTTPS
    traffic.

identifiers:
  cce@ocp4: CCE-83779-9


severity: medium

references:
    cis@ocp4: 1.2.28
    nerc-cip: CIP-003-8 R4.2,CIP-007-3 R5.1
    nist: SC-8,SC-8(1),SC-8(2)
    pcidss: Req-2.2,Req-2.2.3,Req-2.3
    srg: SRG-APP-000441-CTR-001090,SRG-APP-000442-CTR-001095

platform: not ocp4-on-hypershift-hosted

ocil_clause: '<tt>tls-cert-file</tt> is not set as appropriate for <tt>apiServerArguments</tt>'

ocil: |-
    Run the following command:
    <pre>$ oc get configmap config -n openshift-kube-apiserver -ojson | jq -r '.data["config.yaml"]' | jq -r '.apiServerArguments."tls-cert-file"'</pre>
    The output should return <tt>/etc/kubernetes/static-pod-certs/secrets/service-network-serving-certkey/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"

