The Ubuntu operating system must map the authenticated identity to the user or group account for PKI-based authentication.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
high	V-238201	SRG-OS-000068-GPOS-00036	UBTU-20-010006	SV-238201r958452_rule	2025-03-03	2

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.

ℹ️ Check
Verify that "use_mappers" is set to "pwent" in "/etc/pam_pkcs11/pam_pkcs11.conf" file: $ grep use_mappers /etc/pam_pkcs11/pam_pkcs11.conf use_mappers = pwent If "use_mappers" is not found or the list does not contain "pwent" this is a finding.

✔️ 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".

✔️ 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".