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Re: [dane] DNSSEC debug advice (TLSA lookup problem).

Viktor Dukhovni <ietf-dane@dukhovni.org> Fri, 05 September 2014 21:55 UTC

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Date: Fri, 05 Sep 2014 21:55:46 +0000
From: Viktor Dukhovni <ietf-dane@dukhovni.org>
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Subject: Re: [dane] DNSSEC debug advice (TLSA lookup problem).
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On Sat, Sep 06, 2014 at 07:39:34AM +1000, Mark Andrews wrote:

> The problem is the wildcard and the broken wildcard processing, not
> the CNAME.  The rcode is wrong as a result, NOERROR != NXDOMAIN.

Yes, that's it, as I eventually also figured out...

> Alternatively adding a non TLSA records at the expected TLSA names
> should work as it should prevent the attempted wilcard lookup in
> the server and the resulting mis-match.
> 
> _tlsa._tcp.mail.clarion-hotels.cz TXT "-"
> _tlsa._tcp.mail2.clarion-hotels.cz TXT "-"

Right, indeed:

    _25._tcp.mail.clarion-hotels.cz  IN TXT "No TLSA RRs here yet"
    _25._tcp.mail2.clarion-hotels.cz IN TXT "No TLSA RRs here yet"

should do the job.  Thanks, I'll suggest this to them as a better
interim solution.

-- 
	Viktor.

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