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

Mon Mar 3 11:08:40 EST 2008

Everyone gets a separate GUID, it is calculated from the CD key.

Every CD key has its own GUID, and therefore if two players have the same
GUID, they have the same CD key.

In COD2, punkbuster automatically kicks for this for around 2 minutes.

The entire banning system, on punkbuster and its partners such as
punksbusted, and pbbans ban via GUID. Imagine what chaos would be released
if two users have the same GUID, one of them gets banned, it means the
supposable innocent person who has identical GUID, Is also banned.

In effect, this also means that if you purchase a new game, you get a new
GUID. In the COD series, punkbuster doesn't issue hardware bans, and
therefore all players who have been banned via punkbuster, a new cd key will
lift it. Sites like Punksbusted also match and search IP addresses to find
other GUIDS on one IP address, however they do not ban for it.

I hope this makes sense, as I've just come online and have a doctors
appointment booked later... I'm feeling extremely sick and ill and therefore
may be speaking garbage to a few of you. However, this is how I understand
it, and all my theory works with PSB and PBBans etc.

Cheers

-----Original Message-----
From: csmith [mailto:cod4 at divzero.net] 
Sent: 03 March 2008 12:55
To: cod at icculus.org
Subject: Re: [cod] COD4: 2 players with same guid (hack?)

I do not believe this to be correct. My wife and I have separate CD keys 
and play together all the time. both status and pb_sv_plist on my server 
(which is not on our LAN) shows the same IP address with different GUIDs.

Andre Lorbach wrote:
> I know what a GUID is supposed to be and what an IP address is!
>
> An example will explain what I meant in the first place, lets take the 2
> brothers sample:
> BrotherA connects to the a cod4 server and gets the GUID
> 549f8ire98hfji5490htfjoi590gf9i04. The auth server stores the IP and
> GUID and caches this information as I believe for at least 10 minutes.
> Now BrotherB connects to a Cod4 Server, the master server sees the IP of
> BrotherB which is the same as BrotherA, and assigns the cached GUID to
> BrotherB which is 549f8ire98hfji5490htfjoi590gf9i04. BrotherA and
> BrotherB play with the same GUID, but having different cdkeys. 
>
> I believe this is how it works since Cod2. 
>
> Regards,
> Andre
>
>
>   
>> -----Original Message-----
>> From: Ronny Schedel [mailto:info at ronny-schedel.de]
>> Sent: Monday, March 03, 2008 11:05 AM
>> To: cod at icculus.org
>> Subject: Re: [cod] COD4: 2 players with same guid (hack?)
>>
>> 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
>>>
>>>
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>>
>>
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>>     
>
>
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>
>   

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