IETF Logo Mail Archive

Re: [dane] Digest Algorithm Agility discussion

Paul Wouters <paul@nohats.ca> Mon, 24 March 2014 14:54 UTC

Return-Path: <paul@nohats.ca>
X-Original-To: dane@ietfa.amsl.com
Delivered-To: dane@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 45BEE1A0243 for <dane@ietfa.amsl.com>; Mon, 24 Mar 2014 07:54:44 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: 0.69
X-Spam-Level:
X-Spam-Status: No, score=0.69 tagged_above=-999 required=5 tests=[BAYES_50=0.8, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, T_RP_MATCHES_RCVD=-0.01] 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 vaJvB2z6PyPY for <dane@ietfa.amsl.com>; Mon, 24 Mar 2014 07:54:40 -0700 (PDT)
Received: from bofh.nohats.ca (bofh.nohats.ca [76.10.157.69]) by ietfa.amsl.com (Postfix) with ESMTP id 00D3D1A0220 for <dane@ietf.org>; Mon, 24 Mar 2014 07:54:38 -0700 (PDT)
Received: from bofh.nohats.ca (bofh.nohats.ca [127.0.0.1]) by bofh.nohats.ca (Postfix) with ESMTP id 122F4800AA for <dane@ietf.org>; Mon, 24 Mar 2014 10:54:36 -0400 (EDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nohats.ca; s=default; t=1395672876; bh=60aIxl25Kj10tttV+RG5I6LhDppQtVZ6brI1YIW5Q98=; h=Date:From:To:Subject:In-Reply-To:References; b=shTMd/fUfnQcnLi1Wa8bpwiHWzNvelkqR2WgdTgefXs7oJvyyLMxPuT1VB0tsq25g dVHBrrzE6H07MG3a91+quS/1dY8MC4UOVwhru6HTbvN+09fF1I7FqJYFjdnejKUAd/ TyRJsA0sJ6lmDSkxoki9gxLxHM2Zx8uF72w/qDkY=
Received: from localhost (paul@localhost) by bofh.nohats.ca (8.14.7/8.14.7/Submit) with ESMTP id s2OEsZaf025250 for <dane@ietf.org>; Mon, 24 Mar 2014 10:54:35 -0400
X-Authentication-Warning: bofh.nohats.ca: paul owned process doing -bs
Date: Mon, 24 Mar 2014 10:54:35 -0400
From: Paul Wouters <paul@nohats.ca>
To: dane@ietf.org
In-Reply-To: <20140323235727.GC13649@mournblade.imrryr.org>
Message-ID: <alpine.LFD.2.10.1403241052240.18937@bofh.nohats.ca>
References: <0l4n2sa5a0.fsf@wjh.hardakers.net> <20140322074737.GA5739@anguilla.noreply.org> <20140323174205.63C6111B2111@rock.dv.isc.org> <20140323182106.GX24183@mournblade.imrryr.org> <20140323185718.7A84711B2CB8@rock.dv.isc.org> <20140323191037.GA1469@anguilla.noreply.org> <20140323192557.7716111B342A@rock.dv.isc.org> <20140323200008.GB1469@anguilla.noreply.org> <20140323202831.GB13649@mournblade.imrryr.org> <20140323230125.EF23411B4816@rock.dv.isc.org> <20140323235727.GC13649@mournblade.imrryr.org>
User-Agent: Alpine 2.10 (LFD 1266 2009-07-14)
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset="US-ASCII"; format="flowed"
Archived-At: http://mailarchive.ietf.org/arch/msg/dane/4n0AsL1BDli7IkuPXj-Hqctkz1g
Subject: Re: [dane] Digest Algorithm Agility discussion
X-BeenThere: dane@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: DNS-based Authentication of Named Entities <dane.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/dane>, <mailto:dane-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/dane/>
List-Post: <mailto:dane@ietf.org>
List-Help: <mailto:dane-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/dane>, <mailto:dane-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 24 Mar 2014 14:54:44 -0000

On Sun, 23 Mar 2014, Viktor Dukhovni wrote:

> when the TLSA records are entirely unusable, and in keeping with Tony's
> original work on the SRV draft, the client reverts to legacy
> mandatory (practically always unauthenticated) TLS.

That's unfortunate. Perhaps it depends on the definition of "unusable",
but if all TLSA records for instance fail the RRSIG validation, I would
hope that postfix would abort delivery attempts and definately _not_
fallback to unauthenticated TLS.

Paul

v2.23.0 | Report a Bug | By Email