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Re: [ietf-smtp] DANE without DNSSEC (was: certificate pinning)

2014-06-17 17:17:35

In message 
<CAK6vND8qtt29Ln9cPE+eiQ29+y3bNMsy9DsaBFNgS+fWfg_8Ew(_at_)mail(_dot_)gmail(_dot_)com>
, Peter Bowen writes:
On Tue, Jun 17, 2014 at 8:39 AM, Brandon Long <blong(_at_)google(_dot_)com> 
wrote:
Of course, my point is that clearly DANE is better than nothing and DNSSEC
makes it better.  I don't see what leaving out DNSSEC adds holes that don't
already exist worse without DANE.

I was hoping there was something I was missing in my analysis that explaine
d
it.

DANE is better than nothing in some cases but also can be worse than
nothing in other cases.  It all comes down to whether the DANE record
has a certificate usage that specifies to skip checking the trust
store.   Without DNSSEC, this leaves no functional trust chain.

DANE is impossible to exist without DNSSEC.  The D in DANE is DNSSEC.

TLSA without DNSSEC can exist but TLSA is only part of DANE.
 
Mark
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka(_at_)isc(_dot_)org

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