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Full Discussion: help with user permission
Top Forums Shell Programming and Scripting help with user permission Post 302104006 by Perderabo on Tuesday 23rd of January 2007 12:07:07 AM
Old 01-23-2007
Quote:
Originally Posted by nathan
Most systems don't honor setuid/setgid on scripts. My Linux system at home doesn't, and I don't believe HP-UX or AIX do either.
However, Solaris does honor setuid scripts. A setuid script will open an unclosable security hole on most systems. Solaris has the fd file system and uses it to close that particular hole.

I too think that sudo is right way to go here; so I have been reluctant to mention another option. But now that I'm here... Let's say that we have three users whose processes need to be killed:
moe (uid=1025)
larry (uid=1026)
curly (uid=1027)
And we want shemp (uid=1028) to be able to kill processes owned only by moe, larry, and curly. We create a group called "killers" with a gid of, say, 1500; and we make shemp a member of that group. Now, we
Code:
mkdir /usr/local/killcmds
for user in moe larry curly ; do
       cp /usr/bin/kill /usr/local/killcmds/kill${user}
       chown $user /usr/local/killcmds/kill${user} 
       chgrp killers /usr/local/killcmds/kill${user}
       chmod 4050 /usr/local/killcmds/kill${user}
done

Now /usr/local/killcmds has a private kill command for each killable user. It is setuid to the target and it can be executed only by members of the killers group. These kill commands are enough, but I would also develop a script as a front end that invokes the correct kill command. I have not tested this, but I believe that it will work.
 

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SETUID(1)						      General Commands Manual							 SETUID(1)

NAME
setuid - run a command with a different uid. SYNOPSIS
setuid username|uid command [ args ] DESCRIPTION
Setuid changes user id, then executes the specified command. Unlike some versions of su(1), this program doesn't ever ask for a password when executed with effective uid=root. This program doesn't change the environment; it only changes the uid and then uses execvp() to find the command in the path, and execute it. (If the command is a script, execvp() passes the command name to /bin/sh for processing.) For example, setuid some_user $SHELL can be used to start a shell running as another user. Setuid is useful inside scripts that are being run by a setuid-root user -- such as a script invoked with super, so that the script can execute some commands using the uid of the original user, instead of root. This allows unsafe commands (such as editors and pagers) to be used in a non-root mode inside a super script. For example, an operator with permission to modify a certain protected_file could use a super command that simply does: cp protected_file temp_file setuid $ORIG_USER ${EDITOR:-/bin/vi} temp_file cp temp_file protected_file (Note: don't use this example directly. If the temp_file can somehow be replaced by another user, as might be the case if it's kept in a temporary directory, there will be a race condition in the time between editing the temporary file and copying it back to the protected file.) AUTHOR
Will Deich local SETUID(1)
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