SLEM 5 must configure the Linux Pluggable Authentication Modules (PAM) to prohibit the use of cached offline authentications after one day.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-261400	SLEM-05-631015	SV-261400r996619_rule		Medium

Description
If cached authentication information is out of date, the validity of the authentication information may be questionable.

STIG	Date
SUSE Linux Enterprise Micro (SLEM) 5 Security Technical Implementation Guide	2024-06-04

Details

Check Text ( C-65129r996618_chk )
Verify that SLEM 5 PAM prohibits the use of cached off line authentications after one day with the following command: Note: If SSSD is not being used on the operating system, this is not applicable. > sudo grep "offline_credentials_expiration" /etc/sssd/sssd.conf offline_credentials_expiration = 1 If "offline_credentials_expiration" is not set to a value of "1", the line is commented out, or the line is missing, this is a finding.

Check Text ( C-65129r996618_chk )

Verify that SLEM 5 PAM prohibits the use of cached off line authentications after one day with the following command:

Note: If SSSD is not being used on the operating system, this is not applicable.

> sudo grep "offline_credentials_expiration" /etc/sssd/sssd.conf
offline_credentials_expiration = 1

If "offline_credentials_expiration" is not set to a value of "1", the line is commented out, or the line is missing, this is a finding.

Fix Text (F-65037r996066_fix)
Configure SLEM 5 PAM to prohibit the use of cached authentications after one day. Add or modify the following line in the "/etc/sssd/sssd.conf" file, below the line "[pam]": offline_credentials_expiration = 1