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Re: [dns-privacy] Stephen Farrell's Discuss on draft-ietf-dprive-dnsodtls-13: (with DISCUSS and COMMENT)

"Tirumaleswar Reddy (tireddy)" <tireddy@cisco.com> Thu, 15 December 2016 08:32 UTC

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From: "Tirumaleswar Reddy (tireddy)" <tireddy@cisco.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, The IESG <iesg@ietf.org>
Thread-Topic: [dns-privacy] Stephen Farrell's Discuss on draft-ietf-dprive-dnsodtls-13: (with DISCUSS and COMMENT)
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Date: Thu, 15 Dec 2016 08:32:45 +0000
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Subject: Re: [dns-privacy] Stephen Farrell's Discuss on draft-ietf-dprive-dnsodtls-13: (with DISCUSS and COMMENT)
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> -----Original Message-----
> From: Stephen Farrell [mailto:stephen.farrell@cs.tcd.ie]
> Sent: Thursday, December 15, 2016 1:51 PM
> To: Tirumaleswar Reddy (tireddy) <tireddy@cisco.com>; The IESG
> <iesg@ietf.org>
> Cc: tjw.ietf@gmail.com; dns-privacy@ietf.org; draft-ietf-dprive-
> dnsodtls@ietf.org; dprive-chairs@ietf.org
> Subject: Re: [dns-privacy] Stephen Farrell's Discuss on draft-ietf-dprive-
> dnsodtls-13: (with DISCUSS and COMMENT)
> 
> 
> Hiya,
> 
> On 15/12/16 05:15, Tirumaleswar Reddy (tireddy) wrote:
> > Hi Stephen,
> >
> > I missed responding to following comment:
> >
> >> But 0RTT is replayable, which iirc is particularly dangerous for
> >> foo/DTLS/UDP with anycast and if the attacker can see the upstream
> >> queries from an anycast instance with an empty cachce at which the
> >> attacker has targetted a replayed query. So the text in (4) needs a
> >> bit of work I think. (Though it's possible I'm remembering this
> >> stuff badly;-)
> >
> > Good point, will add the following additional text to [4]:
> >
> > DNS query sent using 0-RTT key might be replayed by an attacker and
> > if the anycast instance does not have the resource record cached, and
> > the triggered recursive process of going through the authoritative
> > DNS hierarchy can be used by the attacker to determine the encrypted
> > DNS query resulting in privacy leak through DNS.
> 
> Doesn't the above end up meaning: "don't use 0RTT with DNS/DTLS1.3"?

Yes :)

> 
> I think this may have been raised on the dprive or tls wg lists a
> year or so ago when we were trying to figure out the consequences
> of 0RTT. Would be worthwhile checking that to ensure any text put
> in here is consistent with that analysis.

In DPRIVE WG, TLS 1.3 was discussed but not the attack you pointed out. 
I will remove the text related to this mode and will start a discussion in the WG on usage of 0-RTT mode.

-Tiru

> 
> S.
> 
> >
> > -Tiru
> >
> > _______________________________________________ dns-privacy mailing
> > list dns-privacy@ietf.org
> > https://www.ietf.org/mailman/listinfo/dns-privacy
> >

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