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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LEARN ABOUT REDHAT

pam_stack

pam_stack(8)						   System Administrator's Manual					      pam_stack(8)

NAME

       pam_stack - recurse into other PAM stacks

SYNOPSIS

       auth required /lib/security/pam_stack.so service=foo
       session optional /lib/security/pam_stack.so service=foo
       password optional /lib/security/pam_stack.so service=foo
       account optional /lib/security/pam_stack.so service=foo

DESCRIPTION

       In  a  nutshell,  pam_stack  lets you "call", from inside of the stack for a particular service, the stack defined for any another service.
       The intention is to allow multiple services to "include" a system-wide setup, so that when that setup needs to be changed, it need only	be
       changed in one place.

ARGUMENTS

       debug  turns on debugging via syslog(3).

       service=name
	      tells pam_stack.so to execute the stack defined for the service name, which will usually be another file in /etc/pam.d.

EXAMPLE

       /etc/pam.d/imap:
       auth required /lib/security/pam_stack.so service=system-auth
       auth required /lib/security/pam_shells.so
       /etc/pam.d/system-auth:
       auth sufficient /lib/security/pam_krb5.so
       auth sufficient /lib/security/pam_unix.so shadow nullok
       auth required /lib/security/pam_deny.so

CAVEAT

       Because recursion is fully supported, there is potential to really break things by having a stack call itself either directly or via mutual
       recursion.

BUGS

       Let's hope not, but if you find any, please email the author.

AUTHOR

       Nalin Dahyabhai <nalin@redhat.com>

Red Hat Linux							    2001/01/30							      pam_stack(8)