The SUSE operating system 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-234858	SLES-15-010500	SV-234858r622137_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If cached authentication information is out of date, the validity of the authentication information may be questionable.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 Server 15 Security Technical Implementation Guide	2021-03-04

Details

Check Text ( C-38046r618843_chk )
If SSSD is not being used on the operating system, this is Not Applicable. Verify that the SUSE operating system PAM prohibits the use of cached off line authentications after one day. Check that cached off line authentications cannot be used after one day with the following command: > 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", this is a finding.

Check Text ( C-38046r618843_chk )

If SSSD is not being used on the operating system, this is Not Applicable.

Verify that the SUSE operating system PAM prohibits the use of cached off line authentications after one day.

Check that cached off line authentications cannot be used after one day with the following command:

> 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", this is a finding.

Fix Text (F-38009r618844_fix)
Configure the SUSE operating system PAM to prohibit the use of cached authentications after one day. Add or change the following line in "/etc/sssd/sssd.conf" just below the line "[pam]": offline_credentials_expiration = 1