Re: [LI] Re : HALT by a user

[Sharad Joshi <sharadj@xxxxxxxxxxxxxxxx>]

On Wed, 27 Oct 1999, Sojan James wrote:

+ On Wed, 27 Oct 1999, Bilal Muddassir wrote:
+ 
+ > How to disable the CTRL+ALT+DEL thing so that only root can do halt
+ 
+ # Trap CTRL-ALT-DELETE
+ ca::ctrlaltdel:/sbin/shutdown -t3 -r now
+ <\snip>
+ 
+ You could change the command to be executed to something displaying an
+ error message.
+ 

>From 'man 8 shutdown' page,

<quote>
Access Control
       Shutdown can be called from init(8) when  the  magic  keys
       CTRL-ALT-DEL are pressed, by creating an appropriate entry
       in /etc/inittab. This means that everyone who has physical
       access  to  the console keyboard can shut the system down.
       To prevent this, shutdown can check to see  if  an  autho-
       rized user is logged in on one of the virtual consoles. If
       shutdown is called from init, it checks to see if the file
       /etc/shutdown.allow  is  present.   It  then  compares the
       login names in that file with the list of people that  are
       logged  in on a virtual console (from /var/run/utmp). Only
       if one of those authorized users or root is logged in,  it
       will proceed. Otherwise it will write the message
</quote>

What you need is just a 'shutdown.allow' file in /etc with proper entries.

Sharad.
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