[cod] COD4: 2 players with same guid (hack?)

[Ronny Schedel]

It's not working in this way.

guid = global unique identifier

An IP is not global unique and cannot be used as guid. The CD key is a 
global unique and is used. We have a statistic system running, which relies 
on guids. I have also a dynamic IP address, but my guid remains always the 
same, because the guid depends from the CD key. If two people have the same 
guid, then they have the same CD key.

Best regards

Ronny Schedel

----- Original Message ----- 
From: "Andre Lorbach" <alorbach at ro1.adiscon.com>
To: <cod at icculus.org>
Sent: Monday, March 03, 2008 10:38 AM
Subject: RE: [cod] COD4: 2 players with same guid (hack?)


The master server is caching the Guids based on IP, people playing from
the same location (typically like brothers in LAN) often have the same
GUID, but use different cdkeys! I believe them game is forcing
pb_sv_guidrelax 7 because of this.

And there are also other issues which can happen because of this kind of
caching behavior, I have seen this one at least ONCE. Let me explain
what happened...

A clanm8 came to me and told me he got kicked for GLOBAL BAN once, but
never again then.
So I searched the logfiles and saw that his GUID was different for this
one time when he got kicked.
He told me he did not change his cdkey, and I believe him because it
doesn't make sense to change your key to a banned one, and change it
back then.

So here is what I think happened, and you must know that in germany we
usually have a forced disconnect every 24hours where we get a new IP
assigned. IP's are rare, so it is very usual to get an IP somebody else
wasusing 5 minutes ago. Somebody with a Global banned key tried to play
Cod4 minutes ago, then got a disconnect. My m8 had the disconnect a few
minutes after this, and obtains the IP from the global banned player. My
clanm8 connects to a server, and the master auth server uses the cached
(and banned) GUID for my clanm8.

It's a very rare condition but not impossible to happen.

Best regards,
Andre


> -----Original Message-----
> From: Ronny Schedel [mailto:info at ronny-schedel.de]
> Sent: Sunday, March 02, 2008 5:02 PM
> To: cod at icculus.org
> Subject: [cod] COD4: 2 players with same guid (hack?)
>
> Hello,
>
> today we had 2 players with the same guid on our COD4 server. Is it a
hack?
> Can we prevent this server side?
>
> Best regards
>
> Ronny Schedel
>
>
> ---
> To unsubscribe, send a blank email to cod-unsubscribe at icculus.org
> Mailing list archives: http://icculus.org/cgi-bin/ezmlm/ezmlm-cgi?38
>


---
To unsubscribe, send a blank email to cod-unsubscribe at icculus.org
Mailing list archives: http://icculus.org/cgi-bin/ezmlm/ezmlm-cgi?38