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Full Discussion: A script for shutdown
Top Forums UNIX for Dummies Questions & Answers A script for shutdown Post 302085978 by Corona688 on Monday 21st of August 2006 01:18:19 PM
Old 08-21-2006
The script will be something like:

Code:
#!/bin/sh

exec /sbin/poweroff

i.e. whatever way you shut down the server as root.

Call it turnoff.sh and put it in /sbin/ . Then make sure it's owned by the user root and the group wheel(or whatever other group you want that's a group of people you want to be able to turn off the machine).
Code:
# cp turnoff.sh /sbin/turnoff.sh
# chown root:wheel /sbin/turnoff.sh

Now give it these permissions:
Code:
# chmod 550 /sbin/turnoff.sh
# chmod u+s /sbin/turnoff.sh

As in, only it's owner and it's group can read or execute it, and it has the setuid bit.

That way, people who run the file will run it with root permissions. Yes, it has to be carefully controlled. Setuid is considered dangerous.

Technically, you could do the exact same things to the file itself, but I think it's better to make it a script that won't be replaced every time you upgrade these things.
 

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CONSOLEHELPER(8)					      System Manager's Manual						  CONSOLEHELPER(8)

NAME
consolehelper - A wrapper that helps console users run system programs SYNOPSIS
progname [ options ] DESCRIPTION
consolehelper is a tool that makes it easy for console users to run system programs, doing authentication via PAM (which can be set up to trust all console users or to ask for a password at the system administrator's discretion). When possible, the authentication is done graphically; otherwise, it is done within the text console from which consolehelper was started. It is intended to be completely transparent. This means that the user will never run the consolehelper program directly. Instead, pro- grams like /sbin/shutdown are paired with a link from /usr/bin/shutdown to /usr/bin/consolehelper. Then when non-root users (specifically, users without /sbin in their path, or /sbin after /usr/bin) call the "shutdown" program, consolehelper will be invoked to authenticate the action and then invoke /sbin/shutdown. (consolehelper itself has no priviledges; it calls the userhelper(8) program do the real work.) consolehelper requires that a PAM configuration for every managed program exist. So to make /sbin/foo or /usr/sbin/foo managed, you need to create a link from /usr/bin/foo to /usr/bin/consolehelper and create the file /etc/pam.d/foo, normally using the pam_console(8) PAM mod- ule. OPTIONS
This program has no command line options of its own; it passes all command line options on to the program it is calling. SEE ALSO
userhelper(8) AUTHOR
Michael K. Johnson <johnsonm@redhat.com> Red Hat Software 18 March 1999 CONSOLEHELPER(8)
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