Re: [TLS] I-D Action: draft-ietf-tls-certificate-compression-01.txt

Victor Vasiliev <vasilvv@google.com> Wed, 27 December 2017 20:43 UTC

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From: Victor Vasiliev <vasilvv@google.com>
Date: Wed, 27 Dec 2017 15:43:41 -0500
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To: David Benjamin <davidben@chromium.org>
Cc: Ilari Liusvaara <ilariliusvaara@welho.com>, "tls@ietf.org" <tls@ietf.org>
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Subject: Re: [TLS] I-D Action: draft-ietf-tls-certificate-compression-01.txt
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On Thu, Dec 14, 2017 at 5:43 PM, David Benjamin <davidben@chromium.org>;
wrote:

> Another observation about the middlebox issue: if we leave the text as-is,
> where it is defined for TLS 1.2 server certificates, but we all silently
> agree that servers should decline it at TLS 1.2, clients are still
> obligated to implement it in their TLS 1.2 state machine because the
> advertisement is the same.
>
> If we're never going to deploy it in TLS 1.2 anyway, this seems like a
> waste of the complexity budget. Better to say it is not defined for TLS 1.2
> at all because of non-compliant middleboxes and avoid all this ambiguity.
>

This is a good point.  I've written a PR to change the extension to
1.3-only: https://github.com/tlswg/certificate-compression/pull/9