On Mon, 21 Aug 2006 18:40:28 +0200
"Florian Frankenberger" <[EMAIL PROTECTED]> wrote:

> My problem is that Alice is not in the domain in which the KDC is running. To 
> be more precise, the KDC and the service Alice are set up in different 
> network environments and thus do not know each other.
> Is it possible to create a kerberized service that is not part of the 
> Kerberos realm? If yes, what do I have to do?

Alice and Bob have to be in the same realm or in separate realms that
have a trust established between them. Otherwise the is no basis for
establishing trust between Alice and Bob. Kerberos is a "thrid party
authentication system" so there needs to be someone both principals trust.

> I thought of sharing the symmetric service key between the KDC and Alice. To 
> do so, I tried to create the service Alice with ktpass, give the so created 
> encryption key to Alice and let Alice decrypt the service tickets, that will 
> be delivered by Bobs later.
> 
> Is this procedure possibly in theory? Does anyone know how to obtain the 
> service ticket by using JAAS? I only managed to get the TGT.

If Bob requests a ticket for ALICESVC/[EMAIL PROTECTED] then
even if Bob is [EMAIL PROTECTED] he should have no problem looking up the
KDC for AI-AG.DE using DNS and getting a ticket per usual. But a trust
relationship would be required between AI-AG.DE and AI-AG.US.

Mike

-- 
Michael B Allen
PHP Active Directory SSO
http://www.ioplex.com/
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