Re: [kitten] I-D Action: draft-ietf-kitten-pkinit-alg-agility-07.txt

Benjamin Kaduk <kaduk@mit.edu> Fri, 19 April 2019 03:27 UTC

Return-Path: <kaduk@mit.edu>
X-Original-To: kitten@ietfa.amsl.com
Delivered-To: kitten@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8AAE912009A for <kitten@ietfa.amsl.com>; Thu, 18 Apr 2019 20:27:22 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.6
X-Spam-Level:
X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] 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 QeCVEDR1jiHQ for <kitten@ietfa.amsl.com>; Thu, 18 Apr 2019 20:27:20 -0700 (PDT)
Received: from outgoing.mit.edu (outgoing-auth-1.mit.edu [18.9.28.11]) (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 6FF80120043 for <kitten@ietf.org>; Thu, 18 Apr 2019 20:27:20 -0700 (PDT)
Received: from kduck.mit.edu (24-107-191-124.dhcp.stls.mo.charter.com [24.107.191.124]) (authenticated bits=56) (User authenticated as kaduk@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id x3J3RG90018981 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 18 Apr 2019 23:27:18 -0400
Date: Thu, 18 Apr 2019 22:27:16 -0500
From: Benjamin Kaduk <kaduk@mit.edu>
To: ghudson@mit.edu
Cc: kitten@ietf.org
Message-ID: <20190419032716.GD95327@kduck.mit.edu>
References: <155561430480.25566.6975163425428950529@ietfa.amsl.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Disposition: inline
In-Reply-To: <155561430480.25566.6975163425428950529@ietfa.amsl.com>
User-Agent: Mutt/1.10.1 (2018-07-13)
Archived-At: <https://mailarchive.ietf.org/arch/msg/kitten/Gry0I-Qijcs6OyzKaULhTachhvU>
Subject: Re: [kitten] I-D Action: draft-ietf-kitten-pkinit-alg-agility-07.txt
X-BeenThere: kitten@ietf.org
X-Mailman-Version: 2.1.29
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: <https://mailarchive.ietf.org/arch/browse/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: Fri, 19 Apr 2019 03:27:23 -0000

Thanks for the updates, Greg -- they really help the document out!
(Thanks to Eric for spotting the needed changes.)

Before I push this off for publication, I just wanted to check whether KDC
policy had a role in providing downgrade protection in the discovery
methods from Sections 4 and 5 -- would there be a case where the KDC knows
to require the stronger CMS type/signing algorithm for a specific
principal, so that even if the client is tricked into downgrade by an
attacker, the exchange would still fail?

Thanks,

Ben

On Thu, Apr 18, 2019 at 12:05:04PM -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 Common Authentication Technology Next Generation WG of the IETF.
> 
>         Title           : PKINIT Algorithm Agility
>         Authors         : Love Hornquist Astrand
>                           Larry Zhu
>                           Margaret Wasserman
>                           Greg Hudson
> 	Filename        : draft-ietf-kitten-pkinit-alg-agility-07.txt
> 	Pages           : 20
> 	Date            : 2019-04-18
> 
> Abstract:
>    This document updates the Public Key Cryptography for Initial
>    Authentication in Kerberos standard (PKINIT) [RFC4556], to remove
>    protocol structures tied to specific cryptographic algorithms.  The
>    PKINIT key derivation function is made negotiable, and the digest
>    algorithms for signing the pre-authentication data and the client's
>    X.509 certificates are made discoverable.
> 
>    These changes provide preemptive protection against vulnerabilities
>    discovered in the future against any specific cryptographic
>    algorithm, and allow incremental deployment of newer algorithms.
> 
> 
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-kitten-pkinit-alg-agility/
> 
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-kitten-pkinit-alg-agility-07
> https://datatracker.ietf.org/doc/html/draft-ietf-kitten-pkinit-alg-agility-07
> 
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-kitten-pkinit-alg-agility-07
> 
> 
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> _______________________________________________
> Kitten mailing list
> Kitten@ietf.org
> https://www.ietf.org/mailman/listinfo/kitten