IETF Logo Mail Archive

Re: [DNSOP] ALT-TLD and (insecure) delgations.

Mark Andrews <marka@isc.org> Tue, 07 February 2017 07:27 UTC

Return-Path: <marka@isc.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 C7362129A9D for <dnsop@ietfa.amsl.com>; Mon, 6 Feb 2017 23:27:57 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -6.901
X-Spam-Level:
X-Spam-Status: No, score=-6.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, RP_MATCHES_RCVD=-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 iSacLNb3vXEs for <dnsop@ietfa.amsl.com>; Mon, 6 Feb 2017 23:27:56 -0800 (PST)
Received: from mx.pao1.isc.org (mx.pao1.isc.org [149.20.64.53]) (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 E05F2129A9C for <dnsop@ietf.org>; Mon, 6 Feb 2017 23:27:56 -0800 (PST)
Received: from zmx1.isc.org (zmx1.isc.org [149.20.0.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx.pao1.isc.org (Postfix) with ESMTPS id F230E3493DF; Tue, 7 Feb 2017 07:27:54 +0000 (UTC)
Received: from zmx1.isc.org (localhost [127.0.0.1]) by zmx1.isc.org (Postfix) with ESMTPS id E2C23160054; Tue, 7 Feb 2017 07:27:54 +0000 (UTC)
Received: from localhost (localhost [127.0.0.1]) by zmx1.isc.org (Postfix) with ESMTP id B79D816005C; Tue, 7 Feb 2017 07:27:54 +0000 (UTC)
Received: from zmx1.isc.org ([127.0.0.1]) by localhost (zmx1.isc.org [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id iR-2EnMXwyxR; Tue, 7 Feb 2017 07:27:54 +0000 (UTC)
Received: from rock.dv.isc.org (c27-253-115-14.carlnfd2.nsw.optusnet.com.au [27.253.115.14]) by zmx1.isc.org (Postfix) with ESMTPSA id 1632C160054; Tue, 7 Feb 2017 07:27:54 +0000 (UTC)
Received: from rock.dv.isc.org (localhost [IPv6:::1]) by rock.dv.isc.org (Postfix) with ESMTP id 333B56339A7F; Tue, 7 Feb 2017 18:27:50 +1100 (EST)
To: Brian Dickson <brian.peter.dickson@gmail.com>
From: Mark Andrews <marka@isc.org>
References: <CAH1iCiqXohb_7LsQ2EMo8ZB-t20mKq_nUDS8vebhtSXoM13DTg@mail.gmail.com> <20170203210922.7286C618213C@rock.dv.isc.org> <CAH1iCipKwcOsMQY3kjvSZ42LMK37GLD6GP2AVtnWK0c83k-RiA@mail.gmail.com> <20170207040552.8BDCC632F192@rock.dv.isc.org> <3581BE55-B178-4298-8EE8-73FD16B4216D@gmail.com> <20170207063146.BC04763357A9@rock.dv.isc.org> <99431A77-7B62-4655-89EF-FAA32F2A82F6@gmail.com>
In-reply-to: Your message of "Mon, 06 Feb 2017 23:08:21 -0800." <99431A77-7B62-4655-89EF-FAA32F2A82F6@gmail.com>
Date: Tue, 07 Feb 2017 18:27:50 +1100
Message-Id: <20170207072750.333B56339A7F@rock.dv.isc.org>
Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/WOzC-oQCEY-RZwyz7rALIF5p7vk>
Cc: "dnsop@ietf.org WG" <dnsop@ietf.org>
Subject: Re: [DNSOP] ALT-TLD and (insecure) delgations.
X-BeenThere: dnsop@ietf.org
X-Mailman-Version: 2.1.17
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, 07 Feb 2017 07:27:58 -0000

In message <99431A77-7B62-4655-89EF-FAA32F2A82F6@gmail.com>, Brian Dickson writes:
> The suggestion of DNAME to empty.as112.arpa involves some subtle details,
> which IMHO may in combination be the right mix here.
>
> The DNAME target is an insecure empty zone.
>
> This avoids the validation issue, and facilitates use of local "alt"
> namespaces.

No it doesn't. 

> The default response to queries under alt would be unsigned NXDOMAINs.

No, it would be a secure response saying that foo.alt is covered
by a DNAME.  The names under empty.as112.arpa are unsigned NXDOMAINs.

The difference between the two descriptions is critical to why a
DNAME in the root zone will not work.  You *have* to leak names to
the root to get a DNAME returned by ordinary processing because the
DNAME is signed.

> I am not seeing a problem with this.
>
> Am I missing anything?

Yes.  A solution that *works*.

> Brian
>
> Sent from my iPhone
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org

v2.0.0-dev | Report a Bug | By Email