su: blacklist users

[Man-wai CHANG]

> Just add this to your /etc/pam.d/su file:
> auth       required   pam_wheel.so
> note that you have to ensure your distro includes
> /lib/security/pam_wheel.so for this to work.

I asked about this because I want to allow an careless individual to 
login my linux server via ssh. I don't want someone (if not him) using 
the account to dictionary hack the root password via su.

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