RHEL 9 must enable the Pluggable Authentication Module (PAM) interface for SSHD.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-257986 | RHEL-09-255050 | SV-257986r1045030_rule | High |
| Description |
| When UsePAM is set to "yes", PAM runs through account and session types properly. This is important when restricted access to services based off of IP, time, or other factors of the account is needed. Additionally, this ensures users can inherit certain environment variables on login or disallow access to the server. |
| STIG | Date |
| Red Hat Enterprise Linux 9 Security Technical Implementation Guide | 2024-12-04 |
Details
| Check Text (C-61727r952182_chk) |
| Verify the RHEL 9 SSHD is configured to allow for the UsePAM interface with the following command: $ sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*usepam' UsePAM yes If the "UsePAM" keyword is set to "no", is missing, or is commented out, this is a finding. |
| Fix Text (F-61651r1045029_fix) |
| Configure the RHEL 9 SSHD to use the UsePAM interface by adding or modifying the following line in "/etc/ssh/sshd_config" or in a file in "/etc/ssh/sshd_config.d". UsePAM yes Restart the SSH daemon for the settings to take effect: $ sudo systemctl restart sshd.service |