Elegant Solutions to kill telnet/ssh session Post: 302430327

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Operating Systems Solaris Elegant Solutions to kill telnet/ssh session Post 302430327 by boshyd on Thursday 17th of June 2010 09:05:41 AM

06-17-2010

Registered User

Elegant Solutions to kill telnet/ssh session

We have a generic user account "user1" setup on Solaris 8 that is used by an application. I dont want users to telnet/ssh using this account. Instead if they want to gain access, they must su or sudo to this after logging in with their own ID.

My earlier attempts to accomplish this by disabling telnet/ssh for a particular user have gone nowhere, mostly because I dont understand tcp wrappers.

Disable telnet for a particular user

I am looking for more simpler solutions, maybe a script will do this. A script which looks for this PID and kills it. Before killing the session, I would want a message flashed saying do not login with this account, your telnet session will be removed in 10 seconds or so. Ideally, I want this to happen:

User enters correct "user1" credentials and logs in. System flashes messages saying logout and log back with your own account. Telnet/ssh process is killed.

I got the script to kill the telnet session part as below. However, how do I make message flash for those logging in with this account? Also, how do I ensure this script is always running in background? cron every minute will do the trick or is there any other service (daemon?) which always "listens"? How do I set this up?

Code:

PID=`ps -ef |grep ssh |grep user1 | awk '{print $2}'`
for i in $PID; do echo "killing telnet session process with PID = $i"; 
sleep 10;
kill -9 $PID;
done

Any other more elegant solutions you can propose? Thanks for your time.

Last edited by Scott; 06-17-2010 at 11:50 AM.. Reason: Code tags, please...

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LEARN ABOUT OSF1

telnetrc

telnetrc(4)						     Kernel Interfaces Manual						       telnetrc(4)

NAME

       telnetrc, .telnetrc - Specifies setup commands for a telnet session

SYNOPSIS

       $HOME/.telnetrc

DESCRIPTION

       The .telnetrc file contains the setup information for a telnet session.	It is a hidden file in your home directory and must be readable by
       the user logging in.

       The file can consist of multiple entries for each remote host to which a user can connect.  A remote host entry consists of multiple lines.
       The first line is the name of a remote host. The subsequent lines must begin with blank spaces, and contain telnet subcommands.	These sub-
       commands are processed as though they were typed in manually. Lines beginning with a number sign (#) are comment lines.	See telnet(1)  for
       a complete list of telnet subcommands.

       To specify subcommands that apply to all systems, create an entry, using the word "DEFAULT" as the system name, and specify the telnet sub-
       commands in the subsequent lines.

EXAMPLES

       The following shows a sample .telnetrc file:

       # Beginning of telnetrc file # Default subcommands that apply to all systems DEFAULT
	  environ undefine USER # First system entry system1
	  set echo
	  toggle crlf # Second system entry system2
	  set echo
	  mode line
	  toggle crlf

FILES

       User-customized telnet startup values.

RELATED INFORMATION

       Commands:  telnet(1).  delim off

																       telnetrc(4)