Re: [secdir] secdir review of draft-ietf-dnsop-as112-dname-04

"Klaas Wierenga (kwiereng)" <kwiereng@cisco.com> Thu, 07 August 2014 10:30 UTC

Return-Path: <kwiereng@cisco.com>
X-Original-To: secdir@ietfa.amsl.com
Delivered-To: secdir@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CB88B1B27E5; Thu, 7 Aug 2014 03:30:58 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -16.502
X-Spam-Level:
X-Spam-Status: No, score=-16.502 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, GB_I_LETTER=-2, RCVD_IN_DNSWL_HI=-5, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham
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 foQHiKCiDKqs; Thu, 7 Aug 2014 03:30:57 -0700 (PDT)
Received: from alln-iport-2.cisco.com (alln-iport-2.cisco.com [173.37.142.89]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EBFD21A00EA; Thu, 7 Aug 2014 03:30:56 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2136; q=dns/txt; s=iport; t=1407407457; x=1408617057; h=from:to:subject:date:message-id:references:in-reply-to: content-transfer-encoding:mime-version; bh=y6mHSe/A5Lqofg+nQsc17aVTk/6IEjBRvK6VKBW/gpo=; b=ETitYio9YMjAiDK70myHFEqwV8oa30GKgt6pMQmuziH6DdXJlJNdantx JwSAXIC13vyv4w04AdU+dRNDxn7OS/XrW5ykXQSx/DSr+8Np2cSW2Rmfj RZoQlA2gwHF8GYxNVXOZ9qCTTQahGnhnXucABh7b03I8RCmAup17XO6qR E=;
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: Ai0FAPVU41OtJV2d/2dsb2JhbABagw1SV68LnT8KhnVTAYEWFneEAwEBAQMBAQEBaxALAgEIGC4nCyUCBAESiDoIDcN6F450JTqDL4EcBZUwhmiBVJMZg1dsgQQ
X-IronPort-AV: E=Sophos;i="5.01,817,1400025600"; d="scan'208";a="67259686"
Received: from rcdn-core-6.cisco.com ([173.37.93.157]) by alln-iport-2.cisco.com with ESMTP; 07 Aug 2014 10:30:35 +0000
Received: from xhc-rcd-x07.cisco.com (xhc-rcd-x07.cisco.com [173.37.183.81]) by rcdn-core-6.cisco.com (8.14.5/8.14.5) with ESMTP id s77AUYpg001436 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 7 Aug 2014 10:30:34 GMT
Received: from xmb-aln-x12.cisco.com ([169.254.7.214]) by xhc-rcd-x07.cisco.com ([173.37.183.81]) with mapi id 14.03.0123.003; Thu, 7 Aug 2014 05:30:34 -0500
From: "Klaas Wierenga (kwiereng)" <kwiereng@cisco.com>
To: "iesg@ietf.org" <iesg@ietf.org>, "secdir@ietf.org" <secdir@ietf.org>, "draft-ietf-dnsop-as112-dname.all@tools.ietf.org" <draft-ietf-dnsop-as112-dname.all@tools.ietf.org>
Thread-Topic: [secdir] secdir review of draft-ietf-dnsop-as112-dname-04
Thread-Index: AQHPsiqeTZ2SSkFU00uUSw5pbueKeQ==
Date: Thu, 7 Aug 2014 10:30:33 +0000
Message-ID: <196F3D56-E65E-4870-A3BA-07666488B6CA@cisco.com>
References: <04F423A7-DEEC-47B0-8FB7-61D14F2D89EB@cisco.com>
In-Reply-To: <04F423A7-DEEC-47B0-8FB7-61D14F2D89EB@cisco.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
Content-Type: text/plain; charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
Archived-At: http://mailarchive.ietf.org/arch/msg/secdir/xWB0pQH-dUnFNfxDgXl92OdkD8k
Subject: Re: [secdir] secdir review of draft-ietf-dnsop-as112-dname-04
X-BeenThere: secdir@ietf.org
X-Mailman-Version: 2.1.15
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: <http://www.ietf.org/mail-archive/web/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: Thu, 07 Aug 2014 10:30:59 -0000

Sorry, dropped a letter in copy/paste of draft name 

Sent from my iPad

> On 07 Aug 2014, at 11:45, "Klaas Wierenga (kwiereng)" <kwiereng@cisco.com> wrote:
> 
> Hi,
> 
> I have reviewed this document as part of the security directorate's 
> ongoing effort to review all IETF documents being processed by the 
> IESG.  These comments were written primarily for the benefit of the 
> security area directors.  Document editors and WG chairs should treat 
> these comments just like any other last call comments.
> 
> I believe this document is "ready with issues."
> 
> The document describes adding and dropping of zones for AS112, the zone that is meant rot act as a sinkhole for reverse lookups for addresses that are for private-use only.
> 
> I think the document is clearly written and with my limited understanding of DNS it all seems to make sense from a technical point of view. 
> 
> What I am not so sure of however is the statement in the security considerations: 
> 
> "This document presents no known additional security concerns to the Internet.
> For security considerations relating to AS112 service in general, see RFC6304bis]."
> 
> And in the introduction
> 
> "The AS112 project does not accommodate the addition and removal of
>   DNS zones elegantly.  Since additional zones of definitively local
>   significance are known to exist”
> 
> It appears to me that moving from a static list of well known ranges as defined in 6304bis to a dynamic adding and dropping of IP-address ranges that are "of definitively local
>   significance” is prone to error, potentially leading to blackholing valid address space, either on purpose or by accident. I may show my ignorance here, but I feel that a discussions as to why that risk doesn’t exist is warranted. 
> 
> Hope this helps,
> 
> Klaas
> 
> _______________________________________________
> secdir mailing list
> secdir@ietf.org
> https://www.ietf.org/mailman/listinfo/secdir
> wiki: http://tools.ietf.org/area/sec/trac/wiki/SecDirReview