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Re: [Acme] lack of nonce for external account binding (was Re: Benjamin Kaduk's Discuss on draft-ietf-acme-acme-14:) (with DISCUSS and COMMENT)

"Salz, Rich" <rsalz@akamai.com> Thu, 11 October 2018 14:47 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: Richard Barnes <rlb@ipv.sx>, Benjamin Kaduk <kaduk@mit.edu>
CC: Daniel McCarney <cpu@letsencrypt.org>, "draft-ietf-acme-acme@ietf.org" <draft-ietf-acme-acme@ietf.org>, IETF ACME <acme@ietf.org>, Yoav Nir <ynir.ietf@gmail.com>, The IESG <iesg@ietf.org>, "<acme-chairs@ietf.org>" <acme-chairs@ietf.org>
Thread-Topic: [Acme] lack of nonce for external account binding (was Re: Benjamin Kaduk's Discuss on draft-ietf-acme-acme-14:) (with DISCUSS and COMMENT)
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Date: Thu, 11 Oct 2018 14:47:30 +0000
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Subject: Re: [Acme] lack of nonce for external account binding (was Re: Benjamin Kaduk's Discuss on draft-ietf-acme-acme-14:) (with DISCUSS and COMMENT)
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  *   I actually have the opposite inclination to you here -- if a field is not used by the protocol, then it should be forbidden, in the spirit of [1].  By that logic, we should also forbid the use of the "nonce" field in roll-over.  I think it was just an oversight that we didn't.  The security analysis that Bhargavan et al. did long ago did not presume any use of it.   I've made a PR making it a MUST NOT:


  *   https://github.com/ietf-wg-acme/acme/pull/464<https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_ietf-2Dwg-2Dacme_acme_pull_464&d=DwMFaQ&c=96ZbZZcaMF4w0F4jpN6LZg&r=4LM0GbR0h9Fvx86FtsKI-w&m=zToff9t9YWnqb-chLjc81aGqsWkU3X_LsCwoyOUUBCs&s=12SEIqdV7PqKg5rDKbhBnk-IxDBUMaP76R5KH44d9Y0&e=>


  *   [1] https://tools.ietf.org/html/draft-iab-protocol-maintenance-00<https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Diab-2Dprotocol-2Dmaintenance-2D00&d=DwMFaQ&c=96ZbZZcaMF4w0F4jpN6LZg&r=4LM0GbR0h9Fvx86FtsKI-w&m=zToff9t9YWnqb-chLjc81aGqsWkU3X_LsCwoyOUUBCs&s=7K2iucQLbRsrkZ_plUKpeEBNGXePEQ4TEC5gTY4x7nw&e=>

If anyone in the WG has objections to this, please speak up now.

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