[Samba] How to track attempted breakins, authentication failure logging

[L.P.H. van Belle]

Hai Mark, 

I see the bugreport for this is still untouched. 
https://bugzilla.samba.org/show_bug.cgi?id=11998 

Is vfs_full_audit not an option? 
with %I you can log the IP address of the client machine. 
But i dont know if that wil work of if vfs_full_audit hase that option.

With something like this. 
full_audit:prefix = %u|%I|%m|%S 
full_audit:failure = connect
full_audit:success = connect disconnect 

And maybe you need more options in failure and success. ( man vfs_full_audit ) 
man smb.conf for all the variable substitutions

Greetz, 

Louis


> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens Mark 
> Foley via samba
> Verzonden: dinsdag 19 september 2017 16:08
> Aan: samba at lists.samba.org
> Onderwerp: [Samba] How to track attempted breakins, 
> authentication failure logging
> 
> This may have been asked before, but I can't find it. I am 
> getting repeated external attempted to log into our AD/DC 
> (running Samba 4.4.14). In /var/log/samba/log.samba I get 
> entried like:
> 
> 2017/09/19 05:02:25.562957,  2] 
> ../source4/auth/ntlm/auth.c:430(auth_check_password_recv)
>   auth_check_password_recv: sam_ignoredomain authentication 
> for user [HPRS\333] FAILED with error NT_STATUS_NO_SUCH_USER
> 
> [2017/09/19 05:02:33.493494,  2] 
> ../source4/auth/ntlm/auth.c:430(auth_check_password_recv)
>   auth_check_password_recv: sam_ignoredomain authentication 
> for user [HPRS\ADMINISTRATOR] FAILED with error 
> NT_STATUS_WRONG_PASSWORD
> 
> The first form is the message generated for an attempt at an 
> invalid user. The 2nd form is if they have a valid user, but 
> invalid password.
> 
> I do not get the attacker's IP address which makes it 
> difficult for me to block them.
> 
> My current log level is:
> 
>     log level = 2 passdb:5 auth:10 winbind:2 lanman:10
>     
> Is there some level I can set that would show me the attacking IP?
> 
> This is a current problem as the attacker(s) keep trying, 
> even as I write this.
> 
> THX --Mark
> 
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