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Re: [TLS] TLS 1.3 draft version extension (0xff02)

Xiaoyin Liu <xiaoyin.l@outlook.com> Mon, 22 August 2016 13:09 UTC

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From: Xiaoyin Liu <xiaoyin.l@outlook.com>
To: Ilari Liusvaara <ilariliusvaara@welho.com>, Peter Wu <peter@lekensteyn.nl>
Thread-Topic: [TLS] TLS 1.3 draft version extension (0xff02)
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Date: Mon, 22 Aug 2016 13:09:07 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/tls/FsKV-cNiIlZ0PiFnBg7_O9y-BVY>
Cc: "tls@ietf.org" <tls@ietf.org>, Alexis La Goutte <alexis.lagoutte@gmail.com>
Subject: Re: [TLS] TLS 1.3 draft version extension (0xff02)
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I think it will be nice if IANA can reserve some extension ID numbers for private use, so that whenever we need an extension for testing purpose only, we can pick an ID from the private pool without fear of collisions in the future.



Best,

Xiaoyin







From: Ilari Liusvaara<mailto:ilariliusvaara@welho.com>
Sent: Monday, August 22, 2016 8:48
To: Peter Wu<mailto:peter@lekensteyn.nl>
Cc: tls@ietf.org<mailto:tls@ietf.org>; Alexis La Goutte<mailto:alexis.lagoutte@gmail.com>
Subject: Re: [TLS] TLS 1.3 draft version extension (0xff02)



On Mon, Aug 22, 2016 at 02:29:10PM +0200, Peter Wu wrote:
> Hi,
>
> The Implementations wiki page in the Github repository
> (https://github.com/tlswg/tls13-spec/wiki/Implementations) states that
> extension 0xff02 (65282) defines the TLS draft version in use.

Also, nice surprise mentioning it only there and not in the draft spec
itself (complete with appropriate RFC-Editor notes).

> I cannot seem to find an official registration with IANA though which
> might cause implementation issues in the future if this extension type
> is re-purposed.

There is no registration for it. However, only draft implmentations
send it (final ones won't), which should limit the damage, as draft
implementations are meant for testing only, and not for general-
purpose use.

> Question: can we rely on this extension being used only for specifying
> the TLS draft version? We are working on adding TLS 1.3 support to the
> Wireshark SSL/TLS dissector, if this extension type is not official we
> should probably not add it.

Well, I don't suppose it will be re-used quickly...


-Ilari

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