Re: [Anima-bootstrap] brsky concern1: separating audit-log retrieval from voucher generation
Toerless Eckert <tte@cs.fau.de> Wed, 02 November 2016 01:35 UTC
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Date: Wed, 02 Nov 2016 02:35:44 +0100
From: Toerless Eckert <tte@cs.fau.de>
To: "Max Pritikin (pritikin)" <pritikin@cisco.com>
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References: <20161101201523.GB9776@faui40p.informatik.uni-erlangen.de> <C825BB00-9DEF-4293-8ACB-A453F4C896A6@cisco.com>
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Cc: Toerless Eckert <tte+ietf@cs.fau.de>, "anima-bootstrap@ietf.org" <anima-bootstrap@ietf.org>
Subject: Re: [Anima-bootstrap] brsky concern1: separating audit-log retrieval from voucher generation
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On Tue, Nov 01, 2016 at 10:16:45PM +0000, Max Pritikin (pritikin) wrote: > I see this as the same discussion for ???concern2??? so please look to that thread for responses. I can not identify any text n the sections 6.4 and 7 (that you referred to in the other mail reply) that are discusing the case i made below. Cheers Toerless > - max > > > On Nov 1, 2016, at 2:15 PM, Toerless Eckert <tte+ietf@cs.fau.de> wrote: > > > > As discussed today on the call, restated for the rest of the team with more detail: > > > > -> pledge connects to two networks, A, B. > > -> Pledge tries to well-behave, only offers nonce to one network first, A. > > -> (registrar of) A gets voucher. A looks at audit-log. Audit log is fine. > > Ultimately, A decides not to enroll pledge though. > > -> Pledge offers nonce to B, B gets voucher and audit-log. > > Audit log shows A, so B is concerned. B rejects device. > > Without the entry in audit log, B would have enrolled device. > > > > My worry is that the current audit log approach can too easily create > > false positives that will make enrolment fail if a device has multiple network > > connections: > > > > It's impossible for A to get an audit-log without also getting > > a voucher, which in return would make another domain suspicious and likely > > make it decide not to accept the device. > > > > Separating out request for voucher from request for audit-log could work like this: > > > > A->MASA: request audit-log for (pledge,nonce1) > > MASA: audit-log entry: "A requested audit log for pledge, hash(nonce1)" [1] > > MASA->A: reply: audit-log > > > > ... A makes up its mind if it wants pledge and decides that it does NOT. > > > > -> A doesn't do anything more. Audit log would show B that A did see device, > > but also that A never got voucher so that it could not have modified > > device == B will happily enroll pledge. > > > > > > ... A makes up its mind if it wants pledge and decides that it does want to: > > > > A->MASA: request voucher for (pledge,nonce1) > > MASA: Examine audit-log that no voucher was granted since the audit-log > > was given to A [1]. requests for audit-logs since [1] are > > ignored in this determination. > > MASA->A: If audit-log ok: > > reply OK: voucher(nonce1) > > audit-log entry: "A received voucher for pledge, hash(nonce1)" [2] > > > > If audit-log nok: > > reply NOK: audit-log > > audit-log entry: "A failed voucher request for pledge, hash(nonce1), hash(nonce2)" > > hash(nonce2) would be from an audit-log entry that did happen after > > [1] and > > > > > > Cheers > > Toerless > > > > _______________________________________________ > > Anima-bootstrap mailing list > > Anima-bootstrap@ietf.org > > https://www.ietf.org/mailman/listinfo/anima-bootstrap > -- --- tte@cs.fau.de
- [Anima-bootstrap] brsky concern1: separating audi… Toerless Eckert
- Re: [Anima-bootstrap] brsky concern1: separating … Max Pritikin (pritikin)
- Re: [Anima-bootstrap] brsky concern1: separating … Toerless Eckert
- Re: [Anima-bootstrap] brsky concern1: separating … Michael Richardson