Linux - Deny ssh access for root user, Disabling ssh access for root and allowing su

Deny ssh access for root user

Disabling ssh access for root and allowing "su"

The following are the steps to disable root and enable "su" over SSH

step : 1 create a user make him a member of wheel group.(use cpanel and WHM or manually using shell)

step : 2 uncomment the following line in the file /etc/pam.d/su

auth required /lib/security/$ISA/pam_wheel.so use_uid

(modifications to PAM settings take place immediately unlike other services)

step : 3 comment out the line following in the file /etc/ssh/sshd_config PermitRootLogin no

step : 4 Restart sshd (service sshd restart)

PAM(Pluggable Authentication Module ) - guards linux :

A group of modules which take care of authentication procedures and hence each software programmer need not be concerned about authentication. In our case it is the "su"

A word of caution : Please make sure you retain a ssh root login session until you test these settings and that will help us to revert back to previous settings if something goes wrong.

The topic on Linux - Deny ssh access for root user is posted by - Veen

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