IETF Logo Mail Archive

Re: [dane] Behavior in the face of no answer?

Paul Wouters <paul@cypherpunks.ca> Tue, 08 May 2012 19:49 UTC

Return-Path: <paul@cypherpunks.ca>
X-Original-To: dane@ietfa.amsl.com
Delivered-To: dane@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C29D321F849D for <dane@ietfa.amsl.com>; Tue, 8 May 2012 12:49:30 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.599
X-Spam-Level:
X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gToG+w61aeDH for <dane@ietfa.amsl.com>; Tue, 8 May 2012 12:49:30 -0700 (PDT)
Received: from letoams.cypherpunks.ca (bofh.nohats.ca [76.10.157.69]) by ietfa.amsl.com (Postfix) with ESMTP id 5585F21F848F for <dane@ietf.org>; Tue, 8 May 2012 12:49:30 -0700 (PDT)
Received: by letoams.cypherpunks.ca (Postfix, from userid 500) id F1ADB853FD; Tue, 8 May 2012 15:49:29 -0400 (EDT)
Received: from localhost (localhost [127.0.0.1]) by letoams.cypherpunks.ca (Postfix) with ESMTP id E42978032E; Tue, 8 May 2012 15:49:29 -0400 (EDT)
Date: Tue, 8 May 2012 15:49:29 -0400 (EDT)
From: Paul Wouters <paul@cypherpunks.ca>
X-X-Sender: paul@bofh.nohats.ca
To: Tony Finch <dot@dotat.at>
In-Reply-To: <alpine.LSU.2.00.1205082040330.17365@hermes-2.csi.cam.ac.uk>
Message-ID: <alpine.LFD.2.02.1205081547230.14847@bofh.nohats.ca>
References: <CABcZeBMY26xrfvAx=UsYN2XnuONZ2vPy9tNwHQALudd=yQDvgA@mail.gmail.com> <0526D60A-3F1B-4C55-9796-256BC2556AAB@vpnc.org> <20120503223745.GC1804@mail.yitter.info> <CABcZeBMFV8oiZJfAY1fZ_0bBQWa=q6aBL65AS+W5gBuKmPnwOg@mail.gmail.com> <20120504021044.GB4560@mail.yitter.info> <B25C977F-6B4E-458C-879D-A36EDB94DA75@icsi.berkeley.edu> <20120504023602.GA4683@mail.yitter.info> <CABcZeBO93n_C5detefBcOjAoswe2inGKDj65gQPDQmREyGnhAw@mail.gmail.com> <20120504112922.GB4929@mail.yitter.info> <CABcZeBPTTa07iUHo9XL5WrHGMYHwaQzs6xYtiF25O4Jek8E3RQ@mail.gmail.com> <20120504144426.GD4929@mail.yitter.info> <CABcZeBOM_0L42Rng75AsVda9u4G=FH8=OB8Qg=nQpL-BzRoBuQ@mail.gmail.com> <3FF36EBA-F8B1-4D66-BA00-E8E36A7E449D@kumari.net> <CABcZeBP2iRLa76rSXu4A0OwFxP=tqK1ShZ6wv=6wnaEC6uad+w@mail.gmail.com> <CAMfhd9XYS=9SGotCTwa7NJU4L8WFys2rDVsQZxn4a0wz+NxS3Q@mail.gmail.com> <13B3A487-2C93-4958-8FE6-63132742181E@checkpoint.com> <alpine.LSU.2.00.1205082040330.17365@hermes-2.csi.cam.ac.uk>
User-Agent: Alpine 2.02 (LFD 1266 2009-07-14)
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
Cc: Adam Langley <agl@imperialviolet.org>, "dane@ietf.org" <dane@ietf.org>
Subject: Re: [dane] Behavior in the face of no answer?
X-BeenThere: dane@ietf.org
X-Mailman-Version: 2.1.12
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: Tue, 08 May 2012 19:49:30 -0000

On Tue, 8 May 2012, Tony Finch wrote:

> I think the "DNSSEC works but TLSA doesn't" heuristic may also be useful.

I don't think you can use that at all.

You will still run into DNS implementations that cannot do TLSA or generic
records that are not malicious, and I don't really know how you would
distinguish those from malicious TLSA breakage, so you cannot really
draw any conclusion from such state.

Paul

v2.8.7 | Report a Bug | By Email