🚀 go-pugleaf

RetroBBS NetNews Server

Inspired by RockSolid Light RIP Retro Guy

Article View: comp.security.misc
Article #355

Re: Locking terminals (was Re: New Princeton Policy)

#355
From: Mark J. Sienkiewicz
Date: Mon, 14 Sep 1992 14:13
32 lines
2123 bytes
In article <rik.716283238@nella13.cc.monash.edu.au> rik.harris@fcit.monash.edu.au writes:
>>Simple policy fix: ``If the terminal is locked with anything other than
>>the "standard" lockscreen, it may be rebooted in order to clear the
>>lock.''

Nobody I know reboots terminals - I assume this means "computer" :)

>There's a similar discussion going on at Monash.  Unfortunately the same
>``solution'' came up here.  The problem with Christopher's method is
>that the person who ran the non-standard lockscreen doesn't lose
>by this (any more than a ``log out after 15 mins'' approach), but the
>people who are remotely logged in do lose.  You are punishing the
>remote users, just because of one idiot locking the screen the
>``wrong'' way.

If you have the right set of circumstances, you can just tell people how 
to defeat the lock program.  I just got some HP 9000/710 so I'll use it
as an example:

Normally, you walk up to the machine and see an X based login.  Suppose
you see xlock instead.  You type CTRL-SHIFT-BREAK and the X server dies.
After a few seconds, its back with a new login screen.  Your file
system doesn't get trashed (if you use local disks) and remote users don't
get dropped.

The last time I had a computer with X on it was back when it was R2, and
I can't remember if all the servers had a kill feature like this, but if you
have it, the whole lockscreen thing is a non-issue.  The lockscreen program
prevents unauthorized access to your account while you are away, but does
not allow denial of service.

Mark S.
Technical Details
Message-ID: <1992Sep14.141307.24798@wam.umd.edu>
Path: arc1-ca.pugleaf.net!sparky!uunet!haven.umd.edu!wam.umd.edu!ignatz
References: <68006@hydra.gatech.EDU> <CKD.92Sep11153929@loiosh.eff.org> <rik.716283238@nella13.cc.monash.edu.au>

Show Full Headers
Complete Article Headers
Newsgroups: comp.security.misc
Path: arc1-ca.pugleaf.net!sparky!uunet!haven.umd.edu!wam.umd.edu!ignatz
From: ignatz@wam.umd.edu (Mark J. Sienkiewicz)
Subject: Re: Locking terminals (was Re: New Princeton Policy)
Message-ID: <1992Sep14.141307.24798@wam.umd.edu>
Sender: usenet@wam.umd.edu (USENET News system)
Nntp-Posting-Host: next.wam.umd.edu
Organization: University of Maryland, College Park
References: <68006@hydra.gatech.EDU> <CKD.92Sep11153929@loiosh.eff.org> <rik.716283238@nella13.cc.monash.edu.au>
Date: Mon, 14 Sep 1992 14:13:07 GMT
Lines: 32