Date: Tue, 08 Jul 2008 11:31:04 +0100 From: Dez Accid <dez@accid.net> To: freebsd-questions@freebsd.org Subject: Re: How to disable that an user execute any command Message-ID: <487341E8.9050203@accid.net> In-Reply-To: <50744.217.114.136.134.1215506711.squirrel@mail.dsa.es> References: <50744.217.114.136.134.1215506711.squirrel@mail.dsa.es>
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DSA - JCR wrote: > I want to make an user for the only task of remove/insert the usb copy disk. > > I have made a new user (operator group), and a shell task that ask for the > GELI password and fsck and mount the USB disk. This work fine under root. > > but I think that if he/she want to make CTRL-C to the shell task, he can > stop the task and then enter in the system and look whatever he wants (for > example, how the things are done). > > How can I stop him from entering this CTRL-C (and others than could be) ? If I understand your question correctly, you want to prevent an interactive user running a shell script from breaking out of it via CTRL-C and entering the shell directly. In that case, you can achieve this functionality in your shell script with the use of trap command. E.g. this line will print "Ignoring CTRL-C" on CTRL-C keypress which generates an INT (number 2) signal: trap "echo 'Ignoring INT signal'" 2 This page http://www.shelldorado.com/goodcoding/tempfiles.html describes the shell signals quite well, you may want to give it a read. Thanks! -- Dez Accid
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