Mike Mazur wrote:
Hi,
On Tue, 24 Feb 2009 19:54:16 -0800
Diva Canto <[email protected]> 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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