Re: [dane] email canonicalization for SMIMEA owner names

Mark Andrews <marka@isc.org> Fri, 12 December 2014 01:00 UTC

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From: Mark Andrews <marka@isc.org>
References: <95826148-4F06-4942-87A4-2F6601BA0F90@nist.gov> <20141211221456.GI3448@localhost> <20141211235519.GO25666@mournblade.imrryr.org> <20141212000953.B0FE5254EAE8@rock.dv.isc.org> <20141212003130.GQ25666@mournblade.imrryr.org> <20141212004131.09FDB254F4F4@rock.dv.isc.org> <20141212005550.GR25666@mournblade.imrryr.org>
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Date: Fri, 12 Dec 2014 12:00:07 +1100
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Archived-At: http://mailarchive.ietf.org/arch/msg/dane/c1CFHBWAkkAADn_1THV20d9e2aI
Subject: Re: [dane] email canonicalization for SMIMEA owner names
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In message <20141212005550.GR25666@mournblade.imrryr.org>rg>, Viktor Dukhovni writ
es:
> On Fri, Dec 12, 2014 at 11:41:30AM +1100, Mark Andrews wrote:
> 
> > > If we're really going to do this as a direct query to the remote
> > > domain (and not a DNSSEC lookup), perhaps the right application
> > > protocol is some sort of minimal SMTP over SSL on a port indicated
> > > by the SRV record:
> > > 
> > >     <tcp connect>
> > >     C/S: <TLS handshake>
> > >     C: SMIMEA "Frank.Jr."@example.com
> > >     S: 250-3 1 1 <blob1>
> > >     S: 250 3 1 2 <blob2>
> > >     <TCP disconnect>
> > 
> > But not port 25.  That is blocked too often.
> 
> Absolutely, this would be an additional service on some other port,
> indicated via SRV records, and authenticated via DANE TLSA records.
> 
> The downside of something other than HTTPS or DNS, is that while
> less likely to be blocked for anti-spam reasons, this is likely to
> be inaccessible to MUAs inside various firewalled environments.
> 
> Perhaps a sufficiently light-weight http encapsulation is right
> after all, and MTA authors might be able to implement just enough
> HTTPS to still support this as an MTA feature.
> 
> In Postfix this would be a separate program that runs out of
> "master.cf", but uses the Postfix table facilities to get the data
> out of any supported datastore (including LDAP!).
> 
> This however takes far away from any similarity to the SMIMEA draft
> as it is today.  Is it really time to throw it all away and start
> again?

Yes.  It's just a pity it has taken so long for other to realise this.
 
> -- 
> 	Viktor.
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org