IETF Logo Mail Archive

Re: [secdir] secdir review of draft-ietf-6tisch-architecture-21

Michael Richardson <mcr+ietf@sandelman.ca> Sun, 14 July 2019 21:08 UTC

Return-Path: <mcr@sandelman.ca>
X-Original-To: secdir@ietfa.amsl.com
Delivered-To: secdir@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E568B120183; Sun, 14 Jul 2019 14:08:42 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.899
X-Spam-Level:
X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, 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 CP0nxsXFm0Y6; Sun, 14 Jul 2019 14:08:41 -0700 (PDT)
Received: from relay.sandelman.ca (relay.cooperix.net [IPv6:2a01:7e00::f03c:91ff:feae:de77]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E710012003E; Sun, 14 Jul 2019 14:08:40 -0700 (PDT)
Received: from dooku.sandelman.ca (CPE788a207f397a-CMbc4dfb96bb50.cpe.net.cable.rogers.com [174.116.121.43]) by relay.sandelman.ca (Postfix) with ESMTPS id 95B3F1F44D; Sun, 14 Jul 2019 21:08:39 +0000 (UTC)
Received: by dooku.sandelman.ca (Postfix, from userid 179) id 20CDD1301; Sun, 14 Jul 2019 17:08:58 -0400 (EDT)
From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Tero Kivinen <kivinen@iki.fi>
cc: "Pascal Thubert (pthubert)" <pthubert@cisco.com>, David Mandelberg <david@mandelberg.org>, =?utf-8?Q?Mali=C5=A1a_Vu=C4=8Dini=C4 =87?= <malisav@ac.me>, "secdir@ietf.org" <secdir@ietf.org>, "iesg@ietf.org" <iesg@ietf.org>, "draft-ietf-6tisch-architecture.all@ietf.org" <draft-ietf-6tisch-architecture.all@ietf.org>
In-reply-to: <23846.21789.391089.209823@fireball.acr.fi>
References: <2cced16c-d1df-88c2-eb21-7452b42f081a@mandelberg.org> <MN2PR11MB3565575DA39BCA11E00233B5D8E30@MN2PR11MB3565.namprd11.prod.outlook.com> <23846.21789.391089.209823@fireball.acr.fi>
Comments: In-reply-to Tero Kivinen <kivinen@iki.fi> message dated "Thu, 11 Jul 2019 00:14:05 +0300."
X-Mailer: MH-E 8.6; nmh 1.6; GNU Emacs 24.5.1
MIME-Version: 1.0
Content-Type: multipart/signed; boundary="=-=-="; micalg="pgp-sha256"; protocol="application/pgp-signature"
Date: Sun, 14 Jul 2019 17:08:58 -0400
Message-ID: <7925.1563138538@dooku.sandelman.ca>
Archived-At: <https://mailarchive.ietf.org/arch/msg/secdir/A66IDl5d8ChOlriM2_4QvbgagAg>
Subject: Re: [secdir] secdir review of draft-ietf-6tisch-architecture-21
X-BeenThere: secdir@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Security Area Directorate <secdir.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/secdir>, <mailto:secdir-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/secdir/>
List-Post: <mailto:secdir@ietf.org>
List-Help: <mailto:secdir-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/secdir>, <mailto:secdir-request@ietf.org?subject=subscribe>
X-List-Received-Date: Sun, 14 Jul 2019 21:08:43 -0000

Tero Kivinen <kivinen@iki.fi> wrote:
    > Because of this I think it is better to use some other method, i.e., if
    > JN just generates random cookie and sends that to JP/JRC, and JP/JRC
    > will then echo that same cookie back then JN will know that exchange is
    > fresh, and if that was authenticated using L2 key K1, then ASN was
    > implictly verified also, as JP/JRC who do know correct ASN, will drop
    > the incoming frame as it will have wrong MIC because of wrong nonce.

I think that we can do this with a (unicast)DIS/DIO message which is worth
sending anyway.  We need to find a container for the nonce, but I think that
is easy.

I'm concerned about recovery when the JN has latched onto the wrong beacon.

-- 
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-

v2.23.0 | Report a Bug | By Email