Re: [dane] Review of DANE SMTP draft

James Cloos <cloos@jhcloos.com> Sat, 15 March 2014 01:08 UTC

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From: James Cloos <cloos@jhcloos.com>
To: Viktor Dukhovni <viktor1dane@dukhovni.org>
In-Reply-To: <20140314052342.GQ21390@mournblade.imrryr.org> (Viktor Dukhovni's message of "Fri, 14 Mar 2014 05:23:42 +0000")
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Subject: Re: [dane] Review of DANE SMTP draft
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>>>>> "VD" == Viktor Dukhovni <viktor1dane@dukhovni.org>; writes:

VD> FWIW Postfix by default (Postini work-around) supports wildcard
VD> certificates that match multiple DNS labels:

VD>     http://www.postfix.org/postconf.5.html#tls_wildcard_matches_multiple_labels

VD> The folks at Postini have a wildcard cert for "*.psmtp.com" and
VD> clients publish MX records of the form:

VD>     verisign.com.           IN      MX      100 verisign.com.s6a1.psmtp.com.
VD>     verisign.com.           IN      MX      200 verisign.com.s6a2.psmtp.com.
VD>     verisign.com.           IN      MX      300 verisign.com.s6b1.psmtp.com.
VD>     verisign.com.           IN      MX      400 verisign.com.s6b2.psmtp.com.

For some historical context, mozilla's original wildcarded ssl implement-
ation also allowed an *. to match any number of labels.

Several sites were broken by the change to limit a wildcard to a single label.

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