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Re: [babel] Comments on the MAC authentication for Babel draft

Juliusz Chroboczek <jch@irif.fr> Thu, 27 August 2020 12:58 UTC

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Date: Thu, 27 Aug 2020 14:58:42 +0200
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From: Juliusz Chroboczek <jch@irif.fr>
To: Donald Eastlake <d3e3e3@gmail.com>
Cc: Antonin Décimo <antonin.decimo@gmail.com>, Babel at IETF <babel@ietf.org>
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Subject: Re: [babel] Comments on the MAC authentication for Babel draft
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>>> 4. Accepting Challenges
>> 
>>> When receiving a challenge reply, a node must check if there was a
>>> challenge in progress before validating the challenge.
>> 
>>> However the text does not explicitly describe if there are changes
>>> to be made to the overall state when the challenge succeeds.

>> Right.  The obvious implementation strategy is to discard the challenge
>> state after a challenge has succeeded.  Not doing that does not cause any
>> security issues (it's not required by the proof of correctness).
>> 
>> I think we should add « SHOULD discard the state » here, but it requires
>> Donald's permission.

> I think adding this "SHOULD" would be too much of a change. In principle it
> doesn't require my permission, it requires Martin Vigoureux's permission since
> the draft is out of the WG and in the IESG.

Shall I ask Martin?

> Since it doesn't affect correct operation, I would suggest just creating a
> draft-ietf-babel-hmacbis-00 draft and putting it in that.

I'm not volunteering.

-- Juliusz

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