I have disabled the root user login from Sshd.conf file so now no one can login using root user even if they know the password SOMEHOW.
Now I have 3 users in server ROOT,EMERG and ORACLE. I want to allow switching to ROOT only to EMERG user by using su - and not to ORACLE user.
because normally if users know the ROOT password they can switch to root using su -. And i want this feature available only to EMERG user.
How to do this
Thanks in advance......