Ubuntu 22.04 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-260579	UBTU-22-612040	SV-260579r958452_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 22.04 LTS Security Technical Implementation Guide	2025-05-16

Details

Check Text (C-64308r953548_chk)

Verify that "use_mappers" is set to "pwent" in "/etc/pam_pkcs11/pam_pkcs11.conf" file by using the following command:

$ grep -i use_mappers /etc/pam_pkcs11/pam_pkcs11.conf
use_mappers = pwent

If "use_mappers" does not contain "pwent", is commented out, or is missing, this is a finding.

Fix Text (F-64216r953549_fix)

Set "use_mappers=pwent" in "/etc/pam_pkcs11/pam_pkcs11.conf" or, if there is already a comma-separated list of mappers, add it to the list, separated by comma, and before the null mapper.

If the system is missing an "/etc/pam_pkcs11/" directory and an "/etc/pam_pkcs11/pam_pkcs11.conf", find an example to copy into place and modify accordingly at "/usr/share/doc/libpam-pkcs11/examples/pam_pkcs11.conf.example.gz".