Date: Fri, 31 Oct 1997 02:08:40 -0600 (CST) From: "Matthew D. Fuller" <fullermd@futuresouth.com> To: R Nelson <rjn103s@mgr3.k12.mo.us> Cc: support@FreeBSD.ORG Subject: Re: Checking for concurrent logins Message-ID: <Pine.BSF.3.96.971031020223.22387D-100000@shell.futuresouth.com> In-Reply-To: <B0000056463@mgr3_serverx.mgr3.k12.mo.us>
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On Tue, 28 Oct 1997, R Nelson wrote: > I have searched the mailing lists and had no luck about looking for a simple > script I could execute when a user logs on to check to see if they are > already logged on and if they are to disable that account or at least notify > the administrator. Ouch. I don't think this will work as just a script; it'd have to be suid, which a script can't be. It might have to call a perl module or something to do the editing of the password file. I don't know that much perl, but what you'd have to do is: a) grep/sed/awk through the output of w or who b) if they're there, mail admin and/or call the perl module to change their login shell to /bin/false. a) should be easy with who | grep (username), and checking the return value of grep. b) mailing is of course, a simple matter of mail root -s $USER multiple logins b2) adding /bin/false as login shell is going to be tricky because you'll have to be careful not to thrash the passwd file completely. Just to add my $.02, I think disabling the account automatically in this sort of case is a Bad Idea. I've had cases where I've lost my connection, etc, and my previous session is still active when I get back on. Perhaps mailing the admin and mailing the user in question with a warning and request for explanation would be a good idea. Then again, I don't know your setup and environment, so I can't really judge. > > Thanks in advance!! > Golf and FreeBSD are 2 of the nice things in life;) > *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* | FreeBSD; the way computers were meant to be | * "The only reason I'm burning my candle at both ends, is * | that I haven't figured out how to light the middle yet."| * fullermd@futuresouth.com :-} MAtthew Fuller * | http://keystone.westminster.edu/~fullermd | *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*help
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