Re: [TLS] draft-ietf-tls-tls13 posted

Kazuho Oku <kazuhooku@gmail.com> Thu, 27 October 2016 05:27 UTC

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From: Kazuho Oku <kazuhooku@gmail.com>
Date: Thu, 27 Oct 2016 14:27:09 +0900
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To: Eric Rescorla <ekr@rtfm.com>
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Subject: Re: [TLS] draft-ietf-tls-tls13 posted
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Hi,

Thank you for posting draft-18, and thank you for the simplification of RMS.

I have finished implementing resumption and early-data in picotls. The
effort started just before draft-17 was published, so it would be fair
to say that my effort is solely based on the up-to-date specification.

I am happy to report that all I have found is one minor issue.

The issue I saw is discordance between PSKIdentity.identity and
NewSessionTicket.ticket.

In draft-18, PSKIdentity.identity is defined as <0..2^16-1>. OTOH
NewSessionTicket.ticket is <1..2^16-1>.

Is there any reason to only allow a zero-length identity for the former?

My understanding is that when resuming a session, the value of
NewSessionTicket.ticket is sent as PSKIdentity.identity. So to me, it
seems more natural if the permitted range of the two arrays were
equal.

Please forgive me for the fuss if the difference is intentional.

2016-10-26 14:43 GMT+09:00 Eric Rescorla <ekr@rtfm.com>;:
> Folks,
>
> I have just posted draft-ietf-tls-tls13-18.
>
> The only wire format change from -17 is that I removed the extra key
> derivation stage computing resumption_psk from RMS. This was a
> holdover from when we also had a resumption context. Now PSK for
> connection N+1 = RMS from connection N. Thanks to Kazuho for
> suggesting this simplification.
>
> This draft also makes a number of minor editorial changes that
> should make for easier reading.
>
> The two remaining open technical issues I am aware of are both
> requirements issues:
>
> 1. Can you resume with a different SNI than the one that the
>    connection was initiated with [current answer is "no"]?
>
> 2. Do you need an application profile to do post-handshake
>    client auth [current answer is "no"]?
>
> There has been a bunch of discussion of these on the list but no
> consensus declarations from the chairs. These are easy to change
> in the draft once the chairs make the call.
>
> As always, comments welcome.
>
> -Ekr
>
> P.S. NSS will be skipping draft-17 and going right to -18. This
> should happen before Seoul.
>
>
> _______________________________________________
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>



-- 
Kazuho Oku