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Re: [rtcweb] Consent freshness and message-integrity (Re: Use Case draft - legacy interop)

"Dan Wing" <dwing@cisco.com> Mon, 07 May 2012 21:23 UTC

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From: Dan Wing <dwing@cisco.com>
To: 'Harald Alvestrand' <harald@alvestrand.no>
References: <CA+9kkMCYArLPRP3c00UdOja64WRT6ghN0PSy7XvM_wbxBBB+vA@mail.gmail.com> <2E496AC9-63A0-464A-A628-7407ED8DD9C4@phonefromhere.com> <387F9047F55E8C42850AD6B3A7A03C6C0E23B16B@inba-mail01.sonusnet.com> <E2714FBC-D06B-4A12-9E07-C49EBF55084C@phonefromhere.com> <4F9EC0B2.10903@alcatel-lucent.com> <101C6067BEC68246B0C3F6843BCCC1E31299282765@MCHP058A.global-ad.net> <CAJNg7VKENERKAFA-n5KeoeBNmGgHrnzDOU0BzC9+fSdsuGwdEw@mail.gmail.com> <E17CAD772E76C742B645BD4DC602CD810616F24F@NAHALD.us.int.genesyslab.com> <4FA0F43E.4020308@ericsson.com> <E17CAD772E76C742B645BD4DC602CD810616F336@NAHALD.us.int.genesyslab.com> <4FA1575C.4050508@ericsson.com> <E17CAD772E76C742B645BD4DC602CD810616F4BF@NAHALD.us.int.genesyslab.com> <4FA37A1E.4080806@alvestrand.no> <CALiegf=H5QH_YY-cJ4z29wChWZ-VoQpHvsZCeaJPjTgVp+km3Q@mai l.gmail.com> <0db701cd 2adb$98082f10$c8188d30$@com> <CALiegf=C7a6zeUDHn-Wuku9eFWmADG5N+D8oXSQbwJKSYYjcQg@mail.gmail.com> <0dc901cd2ae3$f9ffb500$edff1f00$@com> <4FA83B3A.9070600@alvestr and.no>
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Date: Mon, 07 May 2012 14:23:48 -0700
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Cc: rtcweb@ietf.org
Subject: Re: [rtcweb] Consent freshness and message-integrity (Re: Use Case draft - legacy interop)
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> -----Original Message-----
> From: Harald Alvestrand [mailto:harald@alvestrand.no]
> Sent: Monday, May 07, 2012 2:15 PM
> To: Dan Wing
> Cc: rtcweb@ietf.org
> Subject: Consent freshness and message-integrity (Re: [rtcweb] Use Case
> draft - legacy interop)
> 
> Forking the thread, since this is a different detail.....
> 
> On 05/05/2012 07:24 PM, Dan Wing wrote:
> > The other nuance is that, because
> > doing the SHA1 for MESSAGE-INTEGRITY isn't needed for consent
> freshness,
> > there is desire to allow those periodic ICE connectivity checks to
> > omit the MESSAGE-INTEGRITY, which is a change to ICE.  See
> > draft-muthu-behave-consent-freshness.
> Omitting MESSAGE-INTEGRITY would allow off-path attackers to inject
> fake
> connectivity checks, and thus to simulate continued consent.

To successfully do that, those off-path attackers would have to guess 
the random 96-bit STUN transaction-id.

-d

> If connectivity checks for content freshness are worth doing, they're
> worth protecting.
> My $0.02.
> 
>                     Harald

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