IETF Logo Mail Archive

Re: [Suit] Suit manifest with variable recipients

Michael Richardson <mcr+ietf@sandelman.ca> Wed, 21 July 2021 20:24 UTC

Return-Path: <mcr+ietf@sandelman.ca>
X-Original-To: suit@ietfa.amsl.com
Delivered-To: suit@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CF97E3A2800 for <suit@ietfa.amsl.com>; Wed, 21 Jul 2021 13:24:45 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.199
X-Spam-Level:
X-Spam-Status: No, score=-4.199 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, 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 cIKWuDvYleQk for <suit@ietfa.amsl.com>; Wed, 21 Jul 2021 13:24:41 -0700 (PDT)
Received: from tuna.sandelman.ca (tuna.sandelman.ca [209.87.249.19]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EFC8F3A27FE for <suit@ietf.org>; Wed, 21 Jul 2021 13:24:40 -0700 (PDT)
Received: from localhost (localhost [127.0.0.1]) by tuna.sandelman.ca (Postfix) with ESMTP id 50DDD38A01 for <suit@ietf.org>; Wed, 21 Jul 2021 16:28:04 -0400 (EDT)
Received: from tuna.sandelman.ca ([127.0.0.1]) by localhost (localhost [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 48zW8tVivtt6 for <suit@ietf.org>; Wed, 21 Jul 2021 16:28:01 -0400 (EDT)
Received: from sandelman.ca (obiwan.sandelman.ca [IPv6:2607:f0b0:f:2::247]) by tuna.sandelman.ca (Postfix) with ESMTP id 41145389F3 for <suit@ietf.org>; Wed, 21 Jul 2021 16:28:01 -0400 (EDT)
Received: from localhost (localhost [IPv6:::1]) by sandelman.ca (Postfix) with ESMTP id AC2AB54A for <suit@ietf.org>; Wed, 21 Jul 2021 16:24:36 -0400 (EDT)
From: Michael Richardson <mcr+ietf@sandelman.ca>
To: suit <suit@ietf.org>
In-Reply-To: <43747220-600F-44EE-98D5-B59C1AA3F63D@vigilsec.com>
References: <F51C5D05-043E-4F07-9A4C-7044646192E3@arm.com> <27551.1626138598@localhost> <4B4235A6-3965-4FBD-AEA8-E16C900C4A0C@arm.com> <43747220-600F-44EE-98D5-B59C1AA3F63D@vigilsec.com>
X-Mailer: MH-E 8.6+git; nmh 1.7+dev; GNU Emacs 26.1
X-Face: $\n1pF)h^`}$H>Hk{L"x@)JS7<%Az}5RyS@k9X%29-lHB$Ti.V>2bi.~ehC0; <'$9xN5Ub# z!G,p`nR&p7Fz@^UXIn156S8.~^@MJ*mMsD7=QFeq%AL4m<nPbLgmtKK-5dC@#:k
MIME-Version: 1.0
Content-Type: multipart/signed; boundary="=-=-="; micalg="pgp-sha512"; protocol="application/pgp-signature"
Date: Wed, 21 Jul 2021 16:24:36 -0400
Message-ID: <7435.1626899076@localhost>
Archived-At: <https://mailarchive.ietf.org/arch/msg/suit/5MbPUoF8ETG387oZsjquiEGlGEI>
Subject: Re: [Suit] Suit manifest with variable recipients
X-BeenThere: suit@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Software Updates for Internet of Things <suit.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/suit>, <mailto:suit-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/suit/>
List-Post: <mailto:suit@ietf.org>
List-Help: <mailto:suit-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/suit>, <mailto:suit-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 21 Jul 2021 20:24:46 -0000

Russ Housley <housley@vigilsec.com> wrote:
    > This is a DoS issue.  We wanted distribution to be able to add
    > recipients and remove recipients.  This means that an attacker can also
    > add recipients and remove recipients.  A second signature to bind the
    > recipient information to the author-signed firmware would be a way to
    > prevent attackers from doing this manimulation, but it comes at the
    > cost of a second signature and the management of the trust anchor to
    > validate it.

I think that management of the first trust anchor is going to be complex
enough.

Before we contemplated a second signature, I think that we'd have to have
more specific (application-specific) use cases that explained how it all went together.

--
Michael Richardson <mcr+IETF@sandelman.ca>   . o O ( IPv6 IøT consulting )
           Sandelman Software Works Inc, Ottawa and Worldwide

v2.23.0 | Report a Bug | By Email