I've been watching this thread with interest.

Assume I have a domain with DNSSEC and inbound mail servers behind a
(load-balanced) MX which support TLS.

If I've been following along correctly, if I publish a DNS record of the
form:

  _25._tcp.*mx.mydomain.org <http://mx.mydomain.org>*. IN TLSA 3 1 1 *<sha2-256
digest of DER leaf public key in X.509 SPKI format>*

this will make some (currently smallish?) set of mail servers sending to me
have a better assurance they are really talking to me.

Is this correct?

And does "*leaf public key" *refer to the public key associated with the
cert used for STARTTLS or ...something else...?


Thanks,
John



--
John Hascall <j...@iastate.edu>
Team Lead, Network Infrastructure, Authentication, & Directory Services
IT Services, The Iowa State University of Science and Technology

On Wed, Jan 7, 2015 at 1:12 PM, Viktor Dukhovni <postfix-us...@dukhovni.org>
wrote:

> On Wed, Jan 07, 2015 at 07:54:03PM +0100, Jean Bruenn wrote:
>
> > I am
> > sure that I'll be able to find a registrar in germany with the
> > same prices, a similar realtime API and dnssec support.
> > Still I would not like to switch after 10+ years without any
> > trouble, to another registrar - call me lazy if you want.
>
> You're lazy. :-)  Take your time, no need to rush.
>
> > Currently I am testing and "playing around" with dnssec,
> > dane and such stuff to learn more about it - I am not in pressure
> > to implement it neither do I need it cuz' its cool or something.
>
> That's what I'm looking for, people who take the time to do it
> right, rather than rush into it half-baked as a fashion statement.
>
> > Would be pretty interesting to see some country-statistic
> > about dnssec usage.
>
> The SMTP DANE adoption by TLD breakdown is:
>
>      794 TOTAL
>      ---------
>      231 de
>      132 net
>       96 com
>       80 org
>       29 eu
>       25 ch
>       21 nl
>       21 cz
>       12 me
>       12 dk
>       11 uk
>       11 fr
>       10 io
>        9 se
>        9 info
>        9 be
>        8 email
>        6 at
>        5 is
>        4 us
>      ...
>
> And many of the .net/.com/.org/.eu domains are really German domains
> "in disguise".  So despite the registrar barriers, .DE is by far
> the biggest early adopter.
>
> --
>         Viktor.
>

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