Re: [dane] Call for Adoption: draft-hoffman-dane-smime.

James Cloos <cloos@jhcloos.com> Mon, 24 September 2012 17:05 UTC

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From: James Cloos <cloos@jhcloos.com>
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In-Reply-To: <alpine.LFD.2.02.1209241056440.29827@bofh.nohats.ca> (Paul Wouters's message of "Mon, 24 Sep 2012 11:02:27 -0400 (EDT)")
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Subject: Re: [dane] Call for Adoption: draft-hoffman-dane-smime.
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>>>>> "PW" == Paul Wouters <paul@cypherpunks.ca> writes:

PW> If only we had decided not to use protoport prefixing....

What does that have to do with anything?  :/

An RR is defined by its wire format.  A TLSA RR is still a TLSA RR no
matter where it happens to be in the DNS.

Just like any other RR.  Eg:

     foo.example.org in ptr bar

is still a PTR RR.  No matter how unlikely it should be that anyone
might dig(1) it.

It occurs to me that what we really need is a spec for how to find *any*
tls cert association to a label which looks like an email address.  Ie,
has a right-hand-part which looks like -- and can been looked up like --
a hostname, a left-hand-part which is contrained only by lenght and an
ascii '@' separating the two.  This covers all of the typical client
certs, whether for interacting with a TLS server, email, code-signing
or anything else which might use email-like labeling.

An smime-specific draft could then reference the more general spec.

We'd need to specify something more general than _smimecert.

And it shouldn't have 'client' in the name, either.  There is no reason
to presume that a foo@bar label implies the concept of 'client'.

Maybe '_at'?  That would make my primary email address look like:

      mnwg633t._at.jhcloos.com 

Nice, generic, and suitable for all such usage.

-JimC
-- 
James Cloos <cloos@jhcloos.com>         OpenPGP: 1024D/ED7DAEA6