Re: [DNSOP] Stephen Farrell's Discuss on draft-ietf-dnsop-5966bis-05: (with DISCUSS)
"Mankin, Allison" <amankin@verisign.com> Thu, 07 January 2016 15:50 UTC
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From: "Mankin, Allison" <amankin@verisign.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
Thread-Topic: [DNSOP] Stephen Farrell's Discuss on draft-ietf-dnsop-5966bis-05: (with DISCUSS)
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Date: Thu, 07 Jan 2016 15:50:21 +0000
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Cc: "tjw.ietf@gmail.com" <tjw.ietf@gmail.com>, "draft-ietf-dnsop-5966bis@ietf.org" <draft-ietf-dnsop-5966bis@ietf.org>, "dnsop-chairs@ietf.org" <dnsop-chairs@ietf.org>, Allison Mankin <allison.mankin@gmail.com>, "dnsop@ietf.org" <dnsop@ietf.org>, IESG <iesg@ietf.org>
Subject: Re: [DNSOP] Stephen Farrell's Discuss on draft-ietf-dnsop-5966bis-05: (with DISCUSS)
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Stephen, That would work. Thank you for suggesting text; we will go ahead with your suggestion. Allison Sent from my iPhone > On Jan 7, 2016, at 09:45, Stephen Farrell <stephen.farrell@cs.tcd.ie> wrote: > > > Hi Alison, > >> On 07/01/16 12:40, Allison Mankin wrote: >> Hi Stephen, >> >> We're glad you drew this important point to our attention, but it appears >> to be needed for draft-ietf-dprive-dns-over-tls rather than this draft. In >> this draft we don't touch on the privacy/TLS motivation for TCP at all, >> leaving all that for the dprive draft. >> >> The dprive draft has just completed WGLC. Some of us are authors on both >> drafts and we'll propose text on TFO privacy leakage risks to dprive and>> our dprive AD and you. > > That's fine. I guess the only remaining question is whether this > document, which does discuss TFO, should have some sort of generic > warning that mixing plaintext and ciphertext is both possible and > dangerous with a pointer to the dprive draft (as an informative ref) > saying that the details are part of the dprive work. So perhaps > adding a sentence to section 9 that says something like: > > "Implementers should be aware that if a DNS privacy mechanism is > being used then there are significant dangers in mixing unprotected > query or response data (from TFO) with protected data. See [dprive] > for the proper way to handle this situation." > > And then [dprive] can say if that kind of mixing is a MUST NOT > or whatever, once that's figured out. > > Cheers, > S. > > >> >> Thanks, >> >> Allison >>> On Jan 6, 2016 7:09 PM, "Stephen Farrell" <stephen.farrell@cs.tcd.ie> wrote: >>> >>> Stephen Farrell has entered the following ballot position for >>> draft-ietf-dnsop-5966bis-05: Discuss >>> >>> When responding, please keep the subject line intact and reply to all >>> email addresses included in the To and CC lines. (Feel free to cut this >>> introductory paragraph, however.) >>> >>> >>> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html>>> for more information about IESG DISCUSS and COMMENT positions. >>> >>> >>> The document, along with other ballot positions, can be found here: >>> https://datatracker.ietf.org/doc/draft-ietf-dnsop-5966bis/ >>> >>> >>> >>> ---------------------------------------------------------------------- >>> DISCUSS: >>> ---------------------------------------------------------------------- >>> >>> >>> Don't we need text warning that TFO is likely problematic >>> with DNS privacy and that attacks that try to prepend >>> information (via TFO) to otherwise secured sessions could >>> occur? While that might sound a bit far-fetched we have >>> seen exactly that kind of issue with HTTPS that had >>> practical impact on Webdav. (The TLS renego and then >>> triple handshake attacks.) So while using TFO may not >>> enable a slam-dunk CVE level 10 attack, I think you do >>> need to consider and talk about it. (Or maybe you did and >>> figured out no attack can work, but then I'd guess you'd >>> be so happy, you'd say that too:-) >>> >>> I'm not sure how this'd best be resolved, but one thing >>> might be to talk to the folks thinking about TCPINC as >>> they have at least hit this as a potential issue for >>> tcpcrypt and for tcp-use-tls. >>> >>> Otherwise, this is a fine document on which I'll ballot >>> yes when the above is sorted. >>> >>> >>> >>> >>> _______________________________________________ >>> DNSOP mailing list >>> DNSOP@ietf.org >>> https://www.ietf.org/mailman/listinfo/dnsop >
- [DNSOP] Stephen Farrell's Discuss on draft-ietf-d… Stephen Farrell
- Re: [DNSOP] Stephen Farrell's Discuss on draft-ie… Allison Mankin
- Re: [DNSOP] Stephen Farrell's Discuss on draft-ie… Stephen Farrell
- Re: [DNSOP] Stephen Farrell's Discuss on draft-ie… Mankin, Allison