IETF Logo Mail Archive

Re: [TLS] Thoughts on Version Intolerance

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

Return-Path: <ilariliusvaara@welho.com>
X-Original-To: tls@ietfa.amsl.com
Delivered-To: tls@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A092012DAF0 for <tls@ietfa.amsl.com>; Thu, 21 Jul 2016 03:54:15 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -3.187
X-Spam-Level:
X-Spam-Status: No, score=-3.187 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RP_MATCHES_RCVD=-1.287] autolearn=ham autolearn_force=no
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id v11wbVeE4vce for <tls@ietfa.amsl.com>; Thu, 21 Jul 2016 03:54:13 -0700 (PDT)
Received: from welho-filter2.welho.com (welho-filter2.welho.com [83.102.41.24]) by ietfa.amsl.com (Postfix) with ESMTP id D081112DD18 for <tls@ietf.org>; Thu, 21 Jul 2016 03:52:53 -0700 (PDT)
Received: from localhost (localhost [127.0.0.1]) by welho-filter2.welho.com (Postfix) with ESMTP id 3A9F88529; Thu, 21 Jul 2016 13:52:52 +0300 (EEST)
X-Virus-Scanned: Debian amavisd-new at pp.htv.fi
Received: from welho-smtp1.welho.com ([IPv6:::ffff:83.102.41.84]) by localhost (welho-filter2.welho.com [::ffff:83.102.41.24]) (amavisd-new, port 10024) with ESMTP id m0tW8daMcZhq; Thu, 21 Jul 2016 13:52:50 +0300 (EEST)
Received: from LK-Perkele-V2 (87-100-177-32.bb.dnainternet.fi [87.100.177.32]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by welho-smtp1.welho.com (Postfix) with ESMTPSA id DFF61C4; Thu, 21 Jul 2016 13:52:50 +0300 (EEST)
Date: Thu, 21 Jul 2016 13:52:46 +0300
From: Ilari Liusvaara <ilariliusvaara@welho.com>
To: David Benjamin <davidben@chromium.org>
Message-ID: <20160721105246.GC23702@LK-Perkele-V2.elisa-laajakaista.fi>
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>
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <CAF8qwaAZ+c0th_n_MZtnBXUg64eaf58DPhoFaPcntST1kcPFZA@mail.gmail.com>
User-Agent: Mutt/1.6.0 (2016-04-01)
Sender: ilariliusvaara@welho.com
Archived-At: <https://mailarchive.ietf.org/arch/msg/tls/rF97O-uvACuCutZy60nWqEVDsgw>
Cc: tls@ietf.org
Subject: Re: [TLS] Thoughts on Version Intolerance
X-BeenThere: tls@ietf.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: "This is the mailing list for the Transport Layer Security working group of the IETF." <tls.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/tls>, <mailto:tls-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/tls/>
List-Post: <mailto:tls@ietf.org>
List-Help: <mailto:tls-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/tls>, <mailto:tls-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 21 Jul 2016 10:54:15 -0000

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

v2.27.8 | Report a Bug | By Email | System Status