Re: [dane] Postfix 2.11.0-RC2 available with feature-complete DANE support

Viktor Dukhovni <viktor1dane@dukhovni.org> Fri, 10 January 2014 00:25 UTC

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Date: Fri, 10 Jan 2014 00:25:33 +0000
From: Viktor Dukhovni <viktor1dane@dukhovni.org>
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Subject: Re: [dane] Postfix 2.11.0-RC2 available with feature-complete DANE support
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On Fri, Jan 10, 2014 at 12:17:26AM +0000, Viktor Dukhovni wrote:

More proof-reading might be a good idea:

> 	; Domain-wide TA CERT TLSA RR, aliased from each service:
> 	;
> 	_25._tcp.mx.example.com. IN CNAME 2.1.1._tlsa.example.com.
> 	2.1.1._tlsa.example.com. IN TLSA 2 0 1 {TA CERT SHA2-256 digest}

The "2.1.1" should have been a  "2.0.1":

 	; Domain-wide TA CERT TLSA RR, aliased from each service:
 	;
 	_25._tcp.mx.example.com. IN CNAME 2.0.1._tlsa.example.com.
 	2.0.1._tlsa.example.com. IN TLSA 2 0 1 {TA CERT SHA2-256 digest}

The reason for "2 0 1" is that with "2 0 1" records Postfix honours
various properties in the TA certificate.  For example, path length
constraints, ...  With "2 1 1", the public key is trusted directly,
and the rest of the TA certificate is ignored.

So I had the right TLSA parameters, but a misleading associated
domain name.

-- 
	Viktor.