IETF Logo Mail Archive

Re: [DNSOP] [Ext] Re: Resolver behaviour with multiple trust anchors

Edward Lewis <edward.lewis@icann.org> Tue, 31 October 2017 19:33 UTC

Return-Path: <edward.lewis@icann.org>
X-Original-To: dnsop@ietfa.amsl.com
Delivered-To: dnsop@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AC72913F5B7 for <dnsop@ietfa.amsl.com>; Tue, 31 Oct 2017 12:33:22 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.2
X-Spam-Level:
X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, MIME_QP_LONG_LINE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-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 SF84IZm1EYoU for <dnsop@ietfa.amsl.com>; Tue, 31 Oct 2017 12:33:21 -0700 (PDT)
Received: from out.west.pexch112.icann.org (pfe112-ca-2.pexch112.icann.org [64.78.40.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6693013F5C6 for <dnsop@ietf.org>; Tue, 31 Oct 2017 12:33:19 -0700 (PDT)
Received: from PMBX112-W1-CA-1.pexch112.icann.org (64.78.40.21) by PMBX112-W1-CA-1.pexch112.icann.org (64.78.40.21) with Microsoft SMTP Server (TLS) id 15.0.1178.4; Tue, 31 Oct 2017 12:33:17 -0700
Received: from PMBX112-W1-CA-1.pexch112.icann.org ([64.78.40.21]) by PMBX112-W1-CA-1.PEXCH112.ICANN.ORG ([64.78.40.21]) with mapi id 15.00.1178.000; Tue, 31 Oct 2017 12:33:17 -0700
From: Edward Lewis <edward.lewis@icann.org>
To: Paul Wouters <paul@nohats.ca>, =?utf-8?B?w5NsYWZ1ciBHdcOwbXVuZHNzb24=?= <olafur@cloudflare.com>
CC: Moritz Muller <moritz.muller@sidn.nl>, "dnsop@ietf.org" <dnsop@ietf.org>
Thread-Topic: [Ext] Re: [DNSOP] Resolver behaviour with multiple trust anchors
Thread-Index: AQHTUiwiqVxvIHBV0Uun1GqDhxVA26L+vEmAgAABTICAABGcgA==
Date: Tue, 31 Oct 2017 19:33:16 +0000
Message-ID: <4678D8A8-1AA0-4684-BFD1-40C969305C49@icann.org>
References: <121CDBC2-D68C-48EE-A56E-46C61FC21538@sidn.nl> <CAN6NTqxy4SWxsUNZyBA=1TZxdhWtVxaTDYLoA1qO2nKf202g9w@mail.gmail.com> <E94AE36A-CA69-47DB-A2B7-41D0C3644855@nohats.ca>
In-Reply-To: <E94AE36A-CA69-47DB-A2B7-41D0C3644855@nohats.ca>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
user-agent: Microsoft-MacOutlook/f.27.0.171010
x-ms-exchange-messagesentrepresentingtype: 1
x-ms-exchange-transport-fromentityheader: Hosted
x-originating-ip: [192.0.47.234]
Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="B_3592308796_152919435"
MIME-Version: 1.0
Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/VKYheNWvnKD6U_ZAOs7cGbFuj0Y>
Subject: Re: [DNSOP] [Ext] Re: Resolver behaviour with multiple trust anchors
X-BeenThere: dnsop@ietf.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: IETF DNSOP WG mailing list <dnsop.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/dnsop>, <mailto:dnsop-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/dnsop/>
List-Post: <mailto:dnsop@ietf.org>
List-Help: <mailto:dnsop-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/dnsop>, <mailto:dnsop-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 31 Oct 2017 19:33:23 -0000

On 10/31/17, 14:30, "DNSOP on behalf of Paul Wouters" <dnsop-bounces@ietf.org on behalf of paul@nohats.ca>; wrote:

> On Oct 31, 2017, at 22:25, Ólafur Guðmundsson <olafur@cloudflare.com>; wrote:
>>
>> There are three ways to treat this case: 
>> Any-TrustedKey-works  
>> ConfiguredKey-trumps-DS 
>> DS-trumps-configuredKey
>>
>> But I suspect the middle one is implemented 
   
>It better, it is the only working solution :)

Can you elaborate...why would it be the "only" "working" solution?

I understand that "Any-TrustedKey-Works" would be hard on implementers (I recall a day when one of the original DNSSEC developers didn't like doing something because it made the code ugly), but it's the one that maximizes robustness.

("What if:" The trust anchor manager was off-line during the time when an Automated Updates [STD 69] revocation was signaled?)

Finding the closest trusted encloser ("trusted" meaning there's a trust anchor data, as opposed to a simple "closest encloser" determined by existence) is simple, finding and handling the list of all trusted enclosure points would make the coding ugly.  That's the only rationale I'd see for not follow a philosophy of "Any-TrustedKey-Works."

v2.1.2.p1 | Report a Bug | By Email