RHEL 9 must enable the Pluggable Authentication Module (PAM) interface for SSHD.

Documentable No

Rule ID SV-257986r1045030_rule

CCI References

CCI-000877

Discussion

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.

Check Procedure

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 Action

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