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.
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'.
The following resource is also helpful.
This security hardening control applies to the following category of controls within NIST 800-53: Identification and Authentication.This control applies to the following type of system Unix.