Date: Fri, 20 Dec 1996 17:44:12 +0100 From: Eivind Eklund <eivind@dimaga.com> To: Sean Winn <sean@perky.gothic.net.au> Cc: security@freebsd.org Subject: Re: stopping users from rebooting with ctr-alt-del Message-ID: <3.0.32.19961220174411.009b7e10@dimaga.com>
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At 01:38 AM 12/21/96 +1100, you wrote: >I can already see a nice simple problem, in that it would only work after >login...if you need to shutdown because you can't login for some reason >(exhausted swap space because of a nasty process?), then this makes things >difficult...but it should help machines in public places around people who >have too much curiosity. A simple solution: In secure mode, make CTRL-ALT-DEL sync the disks, alert the user, and keep synced for a short amount of time (say 5 seconds). Allow three of these syncs, then set a limit of eg 5 minutes before somebody can do it again. This way the administrator can sync and then remove power or hard reset, but a nobody can't do "prank resets" - you get a maximum of 15s/300s = 5% non-disk time if somebody is standing there messing with the machine constantly. (Possibly these constants should be tweaked, but I doubt somebody will stand there for five minutes just to "lock the disk" again) Eivind Eklund / perhaps@yes.no / http://maybe.yes.no/perhaps/
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