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The RHEL 8 SSH daemon must not allow GSSAPI authentication, except to fulfill documented and validated mission requirements.
Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere.
Red Hat Enterprise Linux 8 Security Technical Implementation Guide
Check Text ( C-47803r743831_chk )
Verify the SSH daemon does not allow GSSAPI authentication with the following command:
$ sudo grep -i GSSAPIAuthentication /etc/ssh/sshd_config
If the value is returned as "yes", the returned line is commented out, no output is returned, or has not been documented with the ISSO, this is a finding.
Fix Text (F-47760r743832_fix)
Configure the SSH daemon to not allow GSSAPI authentication.
Add the following line in "/etc/ssh/sshd_config", or uncomment the line and set the value to "no":
The SSH daemon must be restarted for the changes to take effect. To restart the SSH daemon, run the following command:
$ sudo systemctl restart sshd.service