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Re: [TLS] Thoughts on Version Intolerance

Ilari Liusvaara <ilariliusvaara@welho.com> Thu, 21 July 2016 10:54 UTC

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Date: Thu, 21 Jul 2016 13:52:46 +0300
From: Ilari Liusvaara <ilariliusvaara@welho.com>
To: David Benjamin <davidben@chromium.org>
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References: <20160718130843.0320d43f@pc1> <1735315.hXCMA8agXV@pintsize.usersys.redhat.com> <2867948.pp4OFeU9TP@pintsize.usersys.redhat.com> <20160720120125.43f61155@pc1> <98ba8be3-54ca-636b-bca4-4b83682708f5@akamai.com> <CAF8qwaAZ+c0th_n_MZtnBXUg64eaf58DPhoFaPcntST1kcPFZA@mail.gmail.com>
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Cc: tls@ietf.org
Subject: Re: [TLS] Thoughts on Version Intolerance
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On Thu, Jul 21, 2016 at 10:19:34AM +0000, David Benjamin wrote:
> On Wed, Jul 20, 2016 at 5:43 PM Benjamin Kaduk <bkaduk@akamai.com> wrote:
> 
> > On 07/20/2016 05:01 AM, Hanno Böck wrote:
> > > On Wed, 20 Jul 2016 11:20:46 +0200
> > > Hubert Kario <hkario@redhat.com> wrote:
> > >

> And as Hubert notes, there may well be other intolerance triggers to clear
> through. 1.3 has a larger ClientHello. We have also never added a new
> signature algorithm before. But I think that just means we have more rusted
> protocol joints fix rather than just the one.

Could be useful to scan for SignatureScheme. I think the most worthwhile 6
to scan would be:

0x0003 (ECDSA-NONE in TLS 1.2)
0x0004 (UNKNOWN4-NONE in TLS 1.2)
0x0404 (UNKNOWN4-SHA256 in TLS 1.2)
0x0700 (ANON-UNKNOWN7 in TLS 1.2)
0x0703 (ECDSA-UNKNOWN7 in TLS 1.2)
0x0704 (UNKNOWN4-UNKNOWN7 in TLS 1.2)

And then see how many servers do anything retarded with these...


-Ilari

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