On 22/09/2012, at 3:08 PM, Sam Hartman <[email protected]> wrote:

> Jim proposed that acceptors echo back their name rather than simply
> relying on the  name match in channel bindings.

Your recommended implementation strategy (ignore realm if absent on either 
side) is easy to implement, no problem there.

In the case of hostname (or more generally, SPN) aliases, then the initiator 
will fail if the acceptor returns its canonical service principal name, because 
it has no way of validating one against the other (a simple comparison may fail 
and the canonicalisation logic belongs on the server side).

(Historical anecdote: between W2K and W2K3 Microsoft changed the behaviour of 
the canonicalize KDC option in a TGS-REQ so that it would effectively be 
ignored, i.e. not canonicalize the service principal name in the response.)

-- Luke
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