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


Finding ID Version Rule ID IA Controls Severity
V-238201 UBTU-20-010006 SV-238201r832933_rule High
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.
Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide 2022-09-07


Check Text ( C-41411r832932_chk )
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 Text (F-41370r653777_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".