Re: [dane] An AD bit discussion

Mark Andrews <marka@isc.org> Tue, 11 March 2014 06:56 UTC

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To: Florian Weimer <fw@deneb.enyo.de>
From: Mark Andrews <marka@isc.org>
References: <alpine.LFD.2.10.1402260845520.3528@bofh.nohats.ca> <20140226155752.GT21390@mournblade.imrryr.org> <alpine.LFD.2.10.1402261114460.3528@bofh.nohats.ca> <87a9d0ei30.fsf@mid.deneb.enyo.de>
In-reply-to: Your message of "Sat, 08 Mar 2014 18:05:55 +0100." <87a9d0ei30.fsf@mid.deneb.enyo.de>
Date: Tue, 11 Mar 2014 17:46:39 +1100
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Cc: Paul Wouters <paul@nohats.ca>, dane@ietf.org
Subject: Re: [dane] An AD bit discussion
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In message <87a9d0ei30.fsf@mid.deneb.enyo.de>;, Florian Weimer writes:
> * Paul Wouters:
> 
> > Sorry, I mistook the flags in the struct to be the DNS flags. Let me
> > rephrase it as "a DNS API call that returns the presence or lack of
> > AD bit"
> 
> I think this focus on the AD bit is a grave mistake.  There are other
> technologies for securing DNS data.  At least one of them (installing
> an authenticated copy of the zone in the resolver) is superior to
> DNSSEC according to various criteria, but full implementation requires
> that the resolver clears the AD bit.

You can set AD=1 with a local copy of the zone.  I actually run
named locally like this with full dnssec validation of results
returned from the local zone.  You can also just assert AD=1 without
doing validation if that is what your local policy states on secure
transfer.

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Mark Andrews, ISC
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