Is there a way to find when a user is added in Linux host? Post: 302886867

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Top Forums Shell Programming and Scripting Is there a way to find when a user is added in Linux host? Post 302886867 by rbatte1 on Tuesday 4th of February 2014 05:12:26 AM

02-04-2014

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I renamed the executables for useradd, usermod, userdel, passwd, etc. to have suffix .supplied. I then created a script /usr/bin/audit_logger with the below:-

Code:

#!/bin/ksh
# This interceptor script simply logs usage to syslog and the return code
#
# The original command is then passed through to the saved version

who am i | read userid PTS rest
/usr/bin/logger "on $PTS as `id -un` running \"$0 $@\""
echo "`date` : $userid as `id -un` running \"$0 $@\"" >> /sec/auditlog
$0.supplied "$@"
RC=$?
/usr/bin/logger "on $PTS as `id -un` finished \"$0 $@\" RC=$RC"
echo "`date` : $userid as `id -un` finished \"$0 $@\" RC=$RC" >> /sec/auditlog
exit $RC

When hard-linked to replace the original names, this writes messages to the syslog and off to the remote syslog collector because we have an entry in /etc/syslog.conf (or /etc/rsyslog.conf)

Code:

*.debug           @aaa.bbb.ccc.ddd               # Sends all debug to syslog collector at IP address

I hope that this is useful. It's not too clever, and you will need to check that it is kept in place. It writes to the syslog with the logger command, but because this can be lost when it gets to your normal limits, we have a permanent log file locally too in /sec/auditlog.

As we have recently outsourced our user admin, this is invaluable to tracing what they are doing and why and can be audited to trace back to authorised requests. It's not our preference, but dictated by our parent company, yet we still retain the legal responsibility for the servers and the protection of the sensitive personal and financial data they contain.

The security admin staff are trapped in simple menus to keep them away from the command line.

We have this on AIX, HP-UX & RHEL. If you don't have ksh I'm sure that the conversion to bash will be pretty simple.

Robin

rbatte1

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rusers

RUSERS(1)						    BSD General Commands Manual 						 RUSERS(1)

NAME

     rusers -- who is logged in to machines on local network

SYNOPSIS

     rusers [-al] [host ...]

DESCRIPTION

     The rusers command produces output similar to who, but for the list of hosts or all machines on the local network. For each host responding
     to the rusers query, the hostname with the names of the users currently logged on is printed on each line. The rusers command will wait for
     one minute to catch late responders.

     The following options are available:

     -a      Print all machines responding even if no one is currently logged in.

     -l      Print a long format listing. This includes the user name, host name, tty that the user is logged in to, the date and time the user
	     logged in, the amount of time since the user typed on the keyboard, and the remote host they logged in from (if applicable).

DIAGNOSTICS

     rusers: RPC: Program not registered
	     The rpc.rusersd(8) daemon has not been started on the remote host.

     rusers: RPC: Timed out
	     A communication error occurred.  Either the network is excessively congested, or the rpc.rusersd(8) daemon has terminated on the
	     remote host.

     rusers: RPC: Port mapper failure - RPC: Timed out
	     The remote host is not running the portmapper (see portmap(8) ), and cannot accomodate any RPC-based services.  The host may be down.

SEE ALSO

     rwho(1) users(1), who(1), portmap(8), rpc.rusersd(8)

HISTORY

     The rusers command appeared in SunOS.

BUGS

     The sorting options are not implemented.

Linux NetKit (0.17)						  August 15, 1999					       Linux NetKit (0.17)