Re: [DNSOP] Proposal for a new record type: SNI

"John R Levine" <johnl@taugh.com> Mon, 20 February 2017 23:35 UTC

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Date: 20 Feb 2017 15:35:22 -0800
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From: "John R Levine" <johnl@taugh.com>
To: "Warren Kumari" <warren@kumari.net>
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Subject: Re: [DNSOP] Proposal for a new record type: SNI
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> http://www.bieberfever.com/ ("The Official Juston Bieber Fan Club") is
> hosted by Akamai on 23.38.103.18.
> According to DNSDB (IMO the best passive DNS service), there are 605
> other sites *also* hosted on 23.38.103.18.

> No doubt pervasive monitors (and others) will use passive DNS systems
> to build a map of SNI DNS RRs, but I'd much much rather have the men
> in black thinking that I'm visiting www.precisiondoor.net,
> www.theman.in, or www.worldsleadingcruiselines.com than knowing my
> dirty little secret love of the Bieb...

I really don't get this.  The bad guys we're worried about have to be 
sophisticated enough to do a packet capture and pick the SNI bits out of 
TLS handshakes.  How plausible is it that those bad guys would say, oh, 
using a script to find the cert hashes that will reveal the specific site 
is too hard so never mind?

R's,
John