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[kitten] U2F/FIDO/WebAuthn in draft-ietf-kitten-scram-2fa-01

Simon Josefsson <simon@josefsson.org> Tue, 08 February 2022 10:59 UTC

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From: Simon Josefsson <simon@josefsson.org>
To: kitten@ietf.org
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Date: Tue, 08 Feb 2022 11:59:04 +0100
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Subject: [kitten] U2F/FIDO/WebAuthn in draft-ietf-kitten-scram-2fa-01
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I think the document should discuss how U2F/FIDO/WebAuthn would be
supported, since that is (to my knowledge) the best recommended openly
standardized 2fa protocol available.  What do you think?

OATH HOTP/TOTP was superseded as the best recommended choice 5+ years
ago when U2F became available.

Alternatively, perhaps this document should specify a SCRAM-TOTP variant
only, and not allow sub-protocol flexibility, to reduce the number of
sub-negotitations we have in popular SASL mechanisms.  Sub-negotiation
within a SASL mechanism seems to be one major reason why SASL mechanisms
fail as far as I can judge.

/Simon

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