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From Colm O hEigeartaigh <>
Subject Anonymous PKINIT support
Date Tue, 20 Jun 2017 11:39:58 GMT
Hi all,

As per the recent email on JWT, I'd like to look at the outstanding issues
surrounding anonymous PKINIT support in Kerby.

a) Last year I raised concerns about the KDC not signing the response:

Currently, we don't use the private key at all in the KDC when it is
configured as part of KdcConfigKey.PKINIT_IDENTITY. The spec says that:

"If the KDC's signature is missing in the KDC reply
   (the reply is anonymous), the client MUST reject the returned ticket
   if it cannot authenticate the KDC otherwise."

I don't really see how the client can authenticate the KDC as things stand,
so I think we need to sign the KDC response and enforce a signature on the
client side.

b) From the MIT page:

"If you need to enable anonymity support for TGTs (for use as FAST armor
tickets) without enabling anonymous authentication to application servers,
you can set the variable restrict_anonymous_to_tgt to true in the
appropriate [realms] subsection of the KDC’s kdc.conf file."

Is this supported by Kerby? I'm guessing not, but we should add support for

c) Is there a way to differentiate between anonymous + authenticated PKINIT
in the KDC configuration? What if you don't want to allow the anonymous


Colm O hEigeartaigh

Talend Community Coder

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