Re: [TLS] I-D Action: draft-ietf-tls-tlsflags-00.txt

Benjamin Kaduk <bkaduk@akamai.com> Wed, 14 August 2019 00:59 UTC

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Date: Tue, 13 Aug 2019 19:59:11 -0500
From: Benjamin Kaduk <bkaduk@akamai.com>
To: Ilari Liusvaara <ilariliusvaara@welho.com>
Cc: tls@ietf.org
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References: <156563213549.17893.514258464688769886@ietfa.amsl.com> <20190812182519.GA455391@LK-Perkele-VII>
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Subject: Re: [TLS] I-D Action: draft-ietf-tls-tlsflags-00.txt
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On Mon, Aug 12, 2019 at 09:25:19PM +0300, Ilari Liusvaara wrote:
> On Mon, Aug 12, 2019 at 10:48:55AM -0700, internet-drafts@ietf.org wrote:
> > 
> > A New Internet-Draft is available from the on-line Internet-Drafts directories.
> > This draft is a work item of the Transport Layer Security WG of the IETF.
> > 
> >         Title           : A Flags Extension for TLS 1.3
> >         Author          : Yoav Nir
> > 	Filename        : draft-ietf-tls-tlsflags-00.txt
> > 	Pages           : 6
> > 	Date            : 2019-08-12
> > 
> > 
> > The IETF datatracker status page for this draft is:
> > https://datatracker.ietf.org/doc/draft-ietf-tls-tlsflags/
> > 
> > There are also htmlized versions available at:
> > https://tools.ietf.org/html/draft-ietf-tls-tlsflags-00
> > https://datatracker.ietf.org/doc/html/draft-ietf-tls-tlsflags-00
> 
> Two things:
> 
> 
> 1) uint8 flags<0..31>;
> 
> That adds an extra byte that is not technically necressary (because
> extensions have lengths anyway) and limits number of flags to 248
> (which might be enough).
> 
> And I do not think the length of flags field can be 0 (if it would

I think you need to send it in at least one protocol "response", to
confirm support for the extension, even if none of the flags offered
require confirmation/echo individually.

-Ben