Re: [dbound] [art] Related Domains By DNS (RDBD) Draft

Stephen Farrell <stephen.farrell@cs.tcd.ie> Tue, 26 February 2019 09:17 UTC

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To: John Levine <johnl@taugh.com>, dbound@ietf.org
Cc: Alexander_Brotman@comcast.com
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Date: Tue, 26 Feb 2019 09:16:58 +0000
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Subject: Re: [dbound] [art] Related Domains By DNS (RDBD) Draft
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Hi John,

Thanks for taking the time to comment.

On 26/02/2019 03:20, John Levine wrote:
>> https://datatracker.ietf.org/doc/draft-brotman-rdbd/
> 
> It seems overdesigned.  

Doesn't everything? :-)

> If you need to trust the DNS anyway, you can
> just put pointers in both directions in the domains that are related
> to each other, no crypto needed.

Arguably, yes. The parent signing the 2ndary does seem to
add something to me, (even in the presence of DNSSEC) but
I could be wrong. DKIM-like signing in any case seems to
have been shown to only provide a low barrier so I'd hope
that'd not be a reason why people wouldn't use this. (Not
caring at all about it or not finding it useful enough to
bother are more likely reasons;-)

> 
> See Andrew Sullivan's SOPA draft from a few years ago.
> 
> https://datatracker.ietf.org/doc/draft-sullivan-domain-policy-authority/

Yep, had that gone ahead, it'd have worked just fine for
me. Not sure if that's true for Alex's use-cases.

Main differences I see are:
- RDBD has DKIM-like signatures (so a bit of computational
  complexity)
- SOPA has negative assertions and wildcards (which I think
  adds more complexity than signatures, even if the 0 and *
  are easier to put into a zone file than a signature RR)

Our goal with RDBD was to try find a minimal thing that's
interesting enough so people might find it useful and hence
deploy. I don't claim that we've hit that nail on the head
though, so all feedback's very welcome. If a version of
this with the signatures being optional was useful enough,
I'd have no problem with that for example.

Cheers,
S.


> 
> R's,
> John
> 
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