Re: [DNSOP] Creating a registry for reserved labels.

Paul Hoffman <paul.hoffman@icann.org> Thu, 27 September 2018 15:42 UTC

Return-Path: <paul.hoffman@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 585A7130E7C for <dnsop@ietfa.amsl.com>; Thu, 27 Sep 2018 08:42:37 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.9
X-Spam-Level:
X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, 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 YMCrrCItBiGD for <dnsop@ietfa.amsl.com>; Thu, 27 Sep 2018 08:42:35 -0700 (PDT)
Received: from out.west.pexch112.icann.org (out.west.pexch112.icann.org [64.78.40.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A2CA3130E54 for <dnsop@ietf.org>; Thu, 27 Sep 2018 08:42:35 -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 15.0.1367.3; Thu, 27 Sep 2018 08:42:33 -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 15.00.1367.000; Thu, 27 Sep 2018 08:42:33 -0700
From: Paul Hoffman <paul.hoffman@icann.org>
To: dnsop <dnsop@ietf.org>
Thread-Topic: [DNSOP] Creating a registry for reserved labels.
Thread-Index: AQHUVni0VlSCGHsf5Uq85NA0Tp61Dw==
Date: Thu, 27 Sep 2018 15:42:33 +0000
Message-ID: <E0EBE5CE-5EC9-4ACD-BB69-C44B48DE43EA@icann.org>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
x-ms-exchange-messagesentrepresentingtype: 1
x-ms-exchange-transport-fromentityheader: Hosted
x-originating-ip: [192.0.32.234]
Content-Type: multipart/signed; boundary="Apple-Mail=_661989D9-8ACC-46A3-A329-8B078B01D6F6"; protocol="application/pkcs7-signature"; micalg=sha1
MIME-Version: 1.0
Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/7Rd1pvaamrj6g02CRjn6Bp7MPFE>
Subject: Re: [DNSOP] Creating a registry for reserved labels.
X-BeenThere: dnsop@ietf.org
X-Mailman-Version: 2.1.29
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: Thu, 27 Sep 2018 15:42:37 -0000

On 27 Sep 2018, at 8:13, Warren Kumari wrote:

> During the discussions on KSK Sentinel and MTA-STS (
> https://datatracker.ietf.org/doc/draft-ietf-uta-mta-sts/20/) the IESG noted
> that we recently have twice "reserved" use of a left hand (non-underscore)
> label.
>
> It is strongly felt that a registry to record names like this would be
> useful.
>
> Some examples of these names include:
> root-key-sentinel-not-ta-<number>.
> mta-sts.
> xn--(anything).

xn--(anything) labels can appear anywhere.

> Ok, good point.... but, I still think that labels which get special
> handling should be recorded *somewhere*, simply to satisfy the principle of
> least astonishment...

Fully agree. However, the registry should probably be for "special handling", not just for left-most position.
>
> So, does would anyone be willing to volunteer to write a "Special Use
> Labels" document (similar to draft-ietf-dnsop-attrleaf) simply creating a
> registry for "these left hand labels are special / funny in some way" ?

Sure.

--Paul Hoffman