Validating an SMTP server
simsong at acm.org
Mon Sep 7 23:19:51 CEST 2015
Thanks for finding this.
The problem appears to with getdns... it's returning that CNAME lookups are bogus when in fact they are not.
I have filed a ticket request with the getdns team.
Until this is resolved, people should not use my validator, as the results are untrustworthy with regards to CNAME records.
> On Sep 7, 2015, at 4:46 PM, Viktor Dukhovni <ietf-dane at dukhovni.org> wrote:
> On Mon, Sep 07, 2015 at 08:10:38PM +0000, Viktor Dukhovni wrote:
>> And yet the validator claims the TLSA RRset is "bogus",
>> reports failure:
>> BOGUS DNS CNAME lookup _25._tcp.mta.openssl.org. = wildcard._dane.openssl.org.
>> Something's not quite right here...
> The issue seems to be systemic:
> BOGUS DNS CNAME lookup _25._tcp.nlnetlabs.nl = 3.1.1._dane-both.nlnetlabs.nl.
> BOGUS DNS CNAME lookup _25._tcp.mx.spodhuis.org. = _globnix-tlsa.spodhuis.org.
> BOGUS DNS CNAME lookup _25._tcp.wizmail.org. = _cert301.wizmail.org.
> All three are in fact fine. So the handling of TLSA CNAMEs seems
> to be broken.
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