Lockout record

[Steve M. Zak]

Thanks Karen,

Yes that does seem to be the best solution.


Have a great day!


____________________________________________
Steve M. Zak,  


-----Original Message-----
From: Wieprecht, Karen M. [mailto:Karen.Wieprecht at jhuapl.edu] 
Sent: Friday, December 03, 2010 9:54 AM
To: Tomas Mraz; Steve M. Zak
Cc: linux-audit at redhat.com
Subject: RE: Lockout record

We solve this by setting deny=4 if we want to see lockout messages after the 5th failed login.   

-----Original Message-----
From: linux-audit-bounces at redhat.com [mailto:linux-audit-bounces at redhat.com] On Behalf Of Tomas Mraz
Sent: Friday, December 03, 2010 3:20 AM
To: Steve M. Zak
Cc: linux-audit at redhat.com
Subject: RE: Lockout record

On Thu, 2010-12-02 at 17:46 -0500, Steve M. Zak wrote: 
> Hi Steve,
> 
> Thanks for the info! I do see the USER_AUTH events which I didn't know 
> about so thanks.
> 
> I may have something mis-configured, but for instance in my pam.d/sshd 
> file I have deny=5
> 
> I can see the 5 failed attempts as type=USER_AUTH with res=failed, but 
> the RESP_ACCT_LOCK doesn't show up until the 6th login attempt and a 
> message gets displayed to the user "Your account is locked. Maximum 
> amount of failed attempts was reached."
> 
> Does a lock event get written to the audit.log on the 5th attempt? (I 
> didn't see RESP_ACCT_LOCK_TIMED in the log). A Red Hat KB article and 
> Tech Support indicates that the lock happens at deny=n + 1, but it 
> seems to happen at deny=n. The lock event seems to get recorded at 
> deny=n + 1.

You are right. The event is recorded only when the user attempts to log in after the deny=n failed attempts already happened. This is caused by the way pam_tally2 is set up in the PAM stack. The module cannot know if the n-th attempt is failed or not or more exactly said - the module is called only before the authentication in case of failed authentication.
And so it cannot record the lock event earlier than during another authentication attempt for the user.
--
Tomas Mraz
No matter how far down the wrong road you've gone, turn back.
                                              Turkish proverb

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