Re: [dane] An AD bit discussion
Mark Andrews <marka@isc.org> Wed, 26 February 2014 22:51 UTC
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To: dane@ietf.org
From: Mark Andrews <marka@isc.org>
References: <alpine.LFD.2.10.1402260845520.3528@bofh.nohats.ca> <20140226194208.GA19694@solar.andreasschulze.de> <20140226212540.26889106C669@rock.dv.isc.org> <20140226214220.GH21390@mournblade.imrryr.org>
In-reply-to: Your message of "Wed, 26 Feb 2014 21:42:20 -0000." <20140226214220.GH21390@mournblade.imrryr.org>
Date: Thu, 27 Feb 2014 09:50:59 +1100
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Subject: Re: [dane] An AD bit discussion
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In message <20140226214220.GH21390@mournblade.imrryr.org>, Viktor Dukhovni writ es: > On Thu, Feb 27, 2014 at 08:25:40AM +1100, Mark Andrews wrote: > > > The history of the AD bit in responses and it meaning. > > > > RFC 1035 -> AD=0 > > RFC 2535 -> AD=0/1 (records gone through validation) > > RCC 3225 (DO introduced) > > RFC 3655 -> AD=0/1 (DO=1 required, answer and authority sections all secure > ) > > RFC 3755 (type code roll) > > RFC 4035 -> AD=0/1 (DO=1 required, answer and authority sections all secure > ) > > RFC 6840 -> AD=0/1 (DO=1 or AD=1 required, answer and authority sections al > l > > secure) > > Thanks, this is very useful. It remains only to determine whether > for platforms on which the proposed designs are being contemplated, > one can reasonably expect the target (reachable securely, typically > local) resolvers to support AD=1 in the query. > > This information seems to me to be more likely available to the > administrator configuring *static* resolv.conf settings, than to > an application author or user. > > Therefore, my gut reaction is that applications that want the AD > bit need to be able to ask for it, and the stub resolver library > determines how to get the job done with help from resolv.conf. > > The stub resolver library may be able to get away with sending AD=1 > instead of DO=1 and getting a more compact reply. And may suppress > RRSIG elements in the answer, authority and additional sections when > the DO=1 was used because AD=1 was not known to be supported. > > This still leaves us with the question of how libresolv clients > should signal their interest in the AD bit? At the very least the > application needs to know that DNSSEC support is not simply > unavailable. > > With RES_USE_DNSSEC #defined, the application knows that the run-time > promises to send DO=1. There needs to be a similar option bit one > can test for at compile-time, and use to signal that the stub-resolver > library should return AD bits without RRSIGs (or with RRSIGs not > specifically required if it is easier to pass them along if returned). Setting AD isn't that hard. For DANE you aren't going to want to use res_search() to retrieve the TLSA record so this just unwraps res_query(). res_mkquery(...,query,...); query[3] |= 0x08; // set ad in request res_send(query,...); Mark > -- > Viktor. > > _______________________________________________ > dane mailing list > dane@ietf.org > https://www.ietf.org/mailman/listinfo/dane -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka@isc.org
- Re: [dane] An AD bit discussion Paul Wouters
- [dane] An AD bit discussion Paul Wouters
- Re: [dane] An AD bit discussion Mark Andrews
- Re: [dane] An AD bit discussion Ondřej Surý
- Re: [dane] An AD bit discussion Viktor Dukhovni
- Re: [dane] An AD bit discussion Viktor Dukhovni
- Re: [dane] An AD bit discussion Petr Spacek
- Re: [dane] An AD bit discussion Petr Spacek
- Re: [dane] An AD bit discussion Viktor Dukhovni
- Re: [dane] An AD bit discussion Tony Finch
- Re: [dane] An AD bit discussion Viktor Dukhovni
- Re: [dane] An AD bit discussion Petr Spacek
- Re: [dane] An AD bit discussion Viktor Dukhovni
- Re: [dane] An AD bit discussion Olafur Gudmundsson
- Re: [dane] An AD bit discussion Tony Finch
- Re: [dane] An AD bit discussion Tony Finch
- Re: [dane] An AD bit discussion Viktor Dukhovni
- Re: [dane] An AD bit discussion Tony Finch
- Re: [dane] An AD bit discussion Wiley, Glen
- Re: [dane] An AD bit discussion James Cloos
- Re: [dane] An AD bit discussion Viktor Dukhovni
- Re: [dane] An AD bit discussion Andreas Schulze
- Re: [dane] An AD bit discussion Mark Andrews
- Re: [dane] An AD bit discussion Viktor Dukhovni
- Re: [dane] An AD bit discussion Mark Andrews
- Re: [dane] An AD bit discussion Viktor Dukhovni
- Re: [dane] An AD bit discussion Paul Wouters
- Re: [dane] An AD bit discussion Viktor Dukhovni
- Re: [dane] An AD bit discussion Mark Andrews
- Re: [dane] An AD bit discussion Viktor Dukhovni
- Re: [dane] An AD bit discussion Andrew Sullivan
- Re: [dane] An AD bit discussion Mark Andrews
- Re: [dane] An AD bit discussion Andrew Sullivan
- Re: [dane] An AD bit discussion Mark Andrews
- Re: [dane] An AD bit discussion Andrew Sullivan
- Re: [dane] An AD bit discussion Mark Andrews
- Re: [dane] An AD bit discussion Viktor Dukhovni
- Re: [dane] An AD bit discussion Paul Wouters
- Re: [dane] An AD bit discussion Viktor Dukhovni
- Re: [dane] An AD bit discussion Petr Spacek
- Re: [dane] An AD bit discussion Viktor Dukhovni
- Re: [dane] An AD bit discussion (correction) Viktor Dukhovni
- Re: [dane] An AD bit discussion Paul Wouters
- Re: [dane] An AD bit discussion Paul Wouters
- Re: [dane] An AD bit discussion Viktor Dukhovni
- Re: [dane] An AD bit discussion Tony Finch
- Re: [dane] An AD bit discussion Petr Spacek
- Re: [dane] An AD bit discussion (correction) Petr Spacek
- Re: [dane] An AD bit discussion (+concerns from g… Petr Spacek
- Re: [dane] An AD bit discussion (correction) Viktor Dukhovni
- Re: [dane] An AD bit discussion (+concerns from g… Viktor Dukhovni
- Re: [dane] An AD bit discussion Viktor Dukhovni
- Re: [dane] An AD bit discussion (correction) Viktor Dukhovni
- [dane] Proposal: AD bit handling in stub-resolver… Petr Spacek
- Re: [dane] An AD bit discussion Michael Richardson
- Re: [dane] An AD bit discussion Simo Sorce
- Re: [dane] An AD bit discussion Michael Richardson
- Re: [dane] An AD bit discussion Michael Richardson
- Re: [dane] An AD bit discussion Simo Sorce
- Re: [dane] An AD bit discussion Michael Richardson
- Re: [dane] An AD bit discussion Michael Richardson
- Re: [dane] Proposal: AD bit handling in stub-reso… Viktor Dukhovni
- Re: [dane] An AD bit discussion Florian Weimer
- Re: [dane] An AD bit discussion Mark Andrews
- Re: [dane] An AD bit discussion Petr Spacek
- Re: [dane] An AD bit discussion Mark Andrews
- Re: [dane] An AD bit discussion Petr Spacek