[Opensim-dev] User Authentication

[Diva Canto]

  Mike Mazur wrote:
> Hi,
>
> On Tue, 24 Feb 2009 19:54:16 -0800
> Diva Canto <diva at metaverseink.com> wrote:
>
>   
>> * Within a few days: write a simple [optional]
>> UserAuthenticationModule along the lines of option a) that does the
>> following: upon a NewUserConnection, regions will check with the
>> incoming user's User server that the declared user exists and is
>> logged into the system.
>>     
>
> In a grid a region can be told (via a configuration option) which user
> server to check. What about HG regions? How does an HG region know
> which user server to ping? Is this information supplied by the
> connecting client? If so, what's to prevent a malicious client from
> supplying a user server that will always reply favorably?
>   
The HG region sends that information along when the user moves away from 
the home UGAIM. The user carries along the collection of URLs of all of 
the servers it uses. It's ok if the given User Server @ foobar.com 
always says yes -- that's not the problem. The problem we need to detect 
is the user claiming to be from Intel.com or OSGrid.org, when, in fact, 
isn't.

>> Furthermore, upon AddNewClient (which happens
>> shortly after), regions will challenge the incoming client with 3 UDP
>> Ping messages having random seq numbers, to which the incoming client
>> must respond correctly
>>     
>
> How does the client know the correct response?
>   
In fiddling with the client after talking to Teravus, I discovered a 
pair of response-reply packets that can be initiated from the server. 
They are StartPingCheck / CompletePingCheck. They take a byte as 
argument. The server sends StartPingCheck(33), the client responds with 
CompletePingCheck(33). Handy.


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