Ubuntu 20.04 LTS must map the authenticated identity to the user or group account for PKI-based authentication.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-274857	UBTU-20-010022	SV-274857r1101692_rule		High

Description

Without mapping the certificate used to authenticate to the user account, the ability to determine the identity of the individual user or group will not be available for forensic analysis.

STIG	Date
Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide	2025-05-16

Details

Check Text (C-78958r1101690_chk)

Verify that authenticated certificates are mapped to the appropriate user group in the "/etc/sssd/sssd.conf" file with the following command:

$ grep -i ldap_user_certificate /etc/sssd/sssd.conf
ldap_user_certificate=userCertificate;binary

Fix Text (F-78863r1101691_fix)

Configure sssd to map authenticated certificates to the appropriate user group by adding the following line to the "/etc/sssd/sssd.conf" file:

ldap_user_certificate=userCertificate;binary