Problem with structure of authlog in regard to an external log Auditing system. Post: 302851545

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Top Forums UNIX for Dummies Questions & Answers Problem with structure of authlog in regard to an external log Auditing system. Post 302851545 by Sjleegketting on Monday 9th of September 2013 08:03:44 AM

09-09-2013

Registered User

Problem with structure of authlog in regard to an external log Auditing system.

Hello everyone,

I hope I'm posting my question in the right section as it is not too easy to find the ideal spot for this one, especially for a brandspankingnew user of this forum. As this might be something simple I chose the Dummy section. By all means, feel free to move the post if not at the right place here.

The ArcSight auditing system deployed by my Security department has some troubles interpreting specific records in my managed system's auth_log. When a successful login is done you will see the next (anonimized) record logged in the auth_log:

Sep 9 13:49:49 SYSTEMNAME sshd[1613]: [ID 800047 auth.notice] Failed none for USERNAME from XX.XX.XX.XX port XXXX ssh2

I have marked the problematic piece of the sentence by making it bold. The specific part of the sentence "Failed none" unfortunately starts with "Failed" which makes our auditing system think it is a failed login, while it is a successful login.

Unfortunately a change on ArcSight side is out of the question as my system is apparently the only one using this odd phrasing according to support on that side. Switching off auth.notice is also out of the question because they need to be able to see successful logins, which would be gone if I'd disable auth.notice.

I have been looking into how i can manipulate the message logged in the auth_log, but I have been unable to find a befitting way to tackle this problem.

Systeminfo:
PAM seems to be installed and used
SunOS SYSTEMNAME 5.10 Generic_142900-10 sun4v sparc SUNW,Netra-T5440

The question now of course is, does someone know a way of manipulating this sentence structure without having to hack into the syslogger? I've found references to authentication order changing the logged message, but I have been unable to locate a guide that tells me how to do this.

Thanks in advance for your help guys!

Best regards,

Sjleegketting
The Netherlands

Last edited by Sjleegketting; 09-09-2013 at 09:15 AM.. Reason: forgot a quite important part of the problem.

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logger

LOGGER(1)						    BSD General Commands Manual 						 LOGGER(1)

NAME

     logger -- a shell command interface to the syslog(3) system log module

SYNOPSIS

     logger [-isd] [-f file] [-p pri] [-t tag] [-u socket] [message ...]

DESCRIPTION

     Logger makes entries in the system log.  It provides a shell command interface to the syslog(3) system log module.

     Options:

     -i       Log the process id of the logger process with each line.

     -s       Log the message to standard error, as well as the system log.

     -f file  Log the specified file.

     -p pri   Enter the message with the specified priority.  The priority may be specified numerically or as a ``facility.level'' pair.  For
	      example, ``-p local3.info'' logs the message(s) as informational level in the local3 facility.  The default is ``user.notice.''

     -t tag   Mark every line in the log with the specified tag.

     -u sock  Write to socket as specified with socket instead of builtin syslog routines.

     -d       Use a datagram instead of a stream connection to this socket.

     --       End the argument list. This is to allow the message to start with a hyphen (-).

     message  Write the message to log; if not specified, and the -f flag is not provided, standard input is logged.

     The logger utility exits 0 on success, and >0 if an error occurs.

     Valid facility names are: auth, authpriv (for security information of a sensitive nature), cron, daemon, ftp, kern (can't be generated from
     user process), lpr, mail, news, security (deprecated synonym for auth), syslog, user, uucp, and local0 to local7, inclusive.

     Valid level names are): alert, crit, debug, emerg, err, error (deprecated synonym for err), info, notice, panic (deprecated synonym for
     emerg), warning, warn (deprecated synonym for warning).  For the priority order and intended purposes of these levels, see syslog(3).

EXAMPLES

	   logger System rebooted

	   logger -p local0.notice -t HOSTIDM -f /dev/idmc

SEE ALSO

     syslog(3), syslogd(8)

STANDARDS

     The logger command is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

AVAILABILITY

     The logger command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

4.3 Berkeley Distribution					   June 6, 1993 					 4.3 Berkeley Distribution