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Re: [lisp] Virtual meeting

Dino Farinacci <farinacci@gmail.com> Tue, 31 March 2020 17:33 UTC

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From: Dino Farinacci <farinacci@gmail.com>
In-Reply-To: <8e654897-26f6-e4c2-db74-e5a15155e04b@joelhalpern.com>
Date: Tue, 31 Mar 2020 10:33:01 -0700
Cc: "Alberto Rodriguez Natal (natal)" <natal=40cisco.com@dmarc.ietf.org>, "lisp@ietf.org" <lisp@ietf.org>
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To: "Joel M. Halpern" <jmh@joelhalpern.com>
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Subject: Re: [lisp] Virtual meeting
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> thinking about Alberto's request, and reading the document, I wondered if the security could be improved by sending the first notify back via the ETR, and coupling it to LISP-SEC to protect the information and provide needed keys for further messages? It seems like we do need a way to protect the notifications, and requiring associations from every ITR to every MS who may provide notifications seems impossible.

You can’t use LISP-SEC because the transactional nature of it starts with an ITR and a one-time-key, that is used to signed Map-Replies returning to it. 

For Map-Notify messages send from Map-Server via ETR, there would be no ITR one-time-key. And if the Map-Server used its own one-time-key, the ITR couldn’t derive it. Note with LISP-SEC the map-server one-time-key is derived from the ITR’s one-time-key in the Map-Request.

Dino

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