Re: [kitten] draft-hansen-scram-sha256 and incorporating session hashing for channel binding

Simon Josefsson <simon@josefsson.org> Thu, 28 May 2015 19:53 UTC

Return-Path: <simon@josefsson.org>
X-Original-To: kitten@ietfa.amsl.com
Delivered-To: kitten@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 762681A8877 for <kitten@ietfa.amsl.com>; Thu, 28 May 2015 12:53:48 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.551
X-Spam-Level:
X-Spam-Status: No, score=-1.551 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HELO_EQ_SE=0.35, SPF_PASS=-0.001] autolearn=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 2k_u4p8BlMzT for <kitten@ietfa.amsl.com>; Thu, 28 May 2015 12:53:47 -0700 (PDT)
Received: from duva.sjd.se (duva.sjd.se [IPv6:2001:9b0:1:1702::100]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 146F01A8871 for <kitten@ietf.org>; Thu, 28 May 2015 12:53:46 -0700 (PDT)
Received: from latte.josefsson.org ([155.4.17.3]) (authenticated bits=0) by duva.sjd.se (8.14.4/8.14.4/Debian-4) with ESMTP id t4SJrbhV030772 (version=TLSv1/SSLv3 cipher=AES128-GCM-SHA256 bits=128 verify=NOT); Thu, 28 May 2015 21:53:38 +0200
From: Simon Josefsson <simon@josefsson.org>
To: Tony Hansen <tony@att.com>
References: <54DC00D0.2050900@cs.tcd.ie> <54EC66FF.50603@cs.tcd.ie> <54ECABD8.3090902@att.com> <87zj82f1yj.fsf@latte.josefsson.org> <54F4B8B8.8090406@isode.com> <555FC6CF.5020306@att.com> <20150523162728.5b6b63cd@latte.josefsson.org> <5564F27D.70109@att.com> <20150526223206.GE27628@localhost> <20150528171122.2bceebb6@latte.josefsson.org> <55673385.6080006@att.com>
OpenPGP: id=54265E8C; url=http://josefsson.org/54265e8c.txt
X-Hashcash: 1:22:150528:kitten@ietf.org::hydvHbNhub2m0K0P:9nV
X-Hashcash: 1:22:150528:tony@att.com::I5jGZeTpOB7w/nKh:7cCJ
Date: Thu, 28 May 2015 21:53:36 +0200
In-Reply-To: <55673385.6080006@att.com> (Tony Hansen's message of "Thu, 28 May 2015 11:25:57 -0400")
Message-ID: <87iobczdfj.fsf@latte.josefsson.org>
User-Agent: Gnus/5.130014 (Ma Gnus v0.14) Emacs/24.4 (gnu/linux)
MIME-Version: 1.0
Content-Type: multipart/signed; boundary="=-=-="; micalg="pgp-sha256"; protocol="application/pgp-signature"
X-Virus-Scanned: clamav-milter 0.98.7 at duva.sjd.se
X-Virus-Status: Clean
Archived-At: <http://mailarchive.ietf.org/arch/msg/kitten/jkwNOfJgNZa1F-bA0rUDJRNjgGM>
Cc: "kitten@ietf.org" <kitten@ietf.org>
Subject: Re: [kitten] draft-hansen-scram-sha256 and incorporating session hashing for channel binding
X-BeenThere: kitten@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: Common Authentication Technologies - Next Generation <kitten.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/kitten>, <mailto:kitten-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/kitten/>
List-Post: <mailto:kitten@ietf.org>
List-Help: <mailto:kitten-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/kitten>, <mailto:kitten-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 28 May 2015 19:53:48 -0000

Tony Hansen <tony@att.com> writes:

> Simon, right now scram-sha256 does not change anything in the SCRAM base
> spec other than setting the hash mechanism to SHA256.

Right.

> I *think* what you are asking for would actually be a change to the
> SCRAM base spec, which so far has been out of scope for this document.

You are right -- the SCRAM base spec has the same issue.  Depending on
which RFCs the tls-session-hash document will end up Update:'ing, it may
be necessary to revise SCRAM.

/Simon