W3C WebAuthn Working Group J. Hodges
Internet-Draft Google
Intended status: Informational G. Mandyam
Expires: November 20, 2020 Qualcomm Technologies Inc.
M. Jones
Microsoft
May 19, 2020

Registries for Web Authentication (WebAuthn)
draft-hodges-webauthn-registries-08

Abstract

This specification defines IANA registries for W3C Web Authentication attestation statement format identifiers and extension identifiers.

Note to Readers

RFC EDITOR: please remove this section before publication

This is a work-in-progress.

The issues list can be found at https://github.com/w3c/webauthn/issues?q=is%3Aopen+is%3Aissue+label%3Aspec%3Awebauthn-registries .

The most recent _published_ draft revision is at https://tools.ietf.org/html/draft-hodges-webauthn-registries.

The editors' draft is at https://github.com/w3c/webauthn/blob/master/draft-hodges-webauthn-registries.txt

Changes in the editors' draft, both proposed and incorporated, are listed at https://github.com/w3c/webauthn/pulls?q=is%3Apr+label%3Aspec%3Awebauthn-registries

Status of This Memo

This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.

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This Internet-Draft will expire on November 20, 2020.

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Table of Contents

1. Introduction

This specification establishes IANA registries for W3C Web Authentication [WebAuthn] attestation statement format identifiers and extension identifiers. The initial values for these registries are in the IANA Considerations section of the [WebAuthn] specification.

1.1. Requirements Notation and Conventions

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here.

2. IANA Considerations

This specification establishes two registries:

[[ Per discussions in an email thread between the authors and IANA ( "[IANA #1154148]" ), it is requested that the registries be located at <https://www.iana.org/assignments/webauthn>. RFC Editor - please delete this request after the registries have been created. ]]

For both registries, the expert(s) and IANA will interact as follows. IANA will direct any incoming requests regarding either of these registries to this document and, if defined, the processes established by the expert(s); typically, this will mean referring them to the registry Web page.

2.1. WebAuthn Attestation Statement Format Identifier Registry

WebAuthn attestation statement format identifiers are strings whose semantic, syntactic, and string-matching criteria are specified in [WebAuthn] "Attestation Statement Format Identifiers", along with the concepts of attestation and attestation statement formats.

Registered attestation statement format identifiers are those that have been added to the registry by following the procedure in Section 2.1.1.

Each attestation statement format identifier added to this registry MUST be unique amongst the set of registered attestation statement format identifiers.

Registered attestation statement format identifiers MUST be a maximum of 32 octets in length and MUST consist only of printable ASCII [RFC20] characters, excluding backslash and doublequote, i.e., VCHAR as defined in [RFC5234] but without %x22 and %x5c. Attestation statement format identifiers are case sensitive. Attestation statement format identifiers may not match other registered identifiers in a case-insensitive manner unless the Designated Experts determine that there is a compelling reason to allow an exception.

2.1.1. Registering Attestation Statement Format Identifiers

WebAuthn attestation statement format identifiers are registered using the Specification Required policy (see Section 4.6 of [RFC8126]).

The WebAuthn attestation statement format identifiers registry is located at https://www.iana.org/assignments/webauthn. Registration requests can be made by following the instructions located there, or by sending an e-mail to the webauthn-reg-review@ietf.org mailing list.

Registration requests consist of at least the following information:

WebAuthn Attestation Statement Format Identifier

An identifier meeting the requirements given above in Section 2.1.
Description

A relatively short description of the attestation format.
Reference

Reference to the specification of the attestation statement format.
Notes

[optional]

Registrations MUST reference a freely available, stable specification, e.g., as described in Section 4.6 of [RFC8126]. This specification MUST include security and privacy considerations relevant to the attestation statement format.

Note that WebAuthn attestation statement format identifiers can be registered by third parties (including the expert(s) themselves), if the expert(s) determine that an unregistered attestation statement format is widely deployed and not likely to be registered in a timely manner otherwise. Such registrations still are subject to the requirements defined, including the need to reference a specification.

2.1.2. Registration Request Processing

As noted in Section 2.1.1, WebAuthn attestation statement format identifiers are registered using the Specification Required policy.

The expert(s) will clearly identify any issues which cause a registration to be refused.

When a request is approved, the expert(s) will inform IANA, and the registration will be processed. The IESG is the arbiter of any objection.

2.1.3. Initial WebAuthn Attestation Statement Format Identifier Registry Values

The initial values for the WebAuthn Attestation Statement Format Identifier Registry are to be populated from the values listed in "WebAuthn Attestation Statement Format Identifier Registrations" of [WebAuthn].

2.2. WebAuthn Extension Identifier Registry

WebAuthn extension identifiers are strings whose semantic, syntactic, and string-matching criteria are specified in [WebAuthn] "Extension Identifiers" .

Registered extension identifiers are those that have been added to the registry by following the procedure in Section 2.2.1.

Each extension identifier added to this registry MUST be unique amongst the set of registered extension identifiers.

Registered extension identifiers MUST be a maximum of 32 octets in length and MUST consist only of printable ASCII characters, excluding backslash and doublequote, i.e., VCHAR as defined in [RFC5234] but without %x22 and %x5c. Extension identifiers are case sensitive. Extension identifiers may not match other registered names in a case-insensitive manner unless the Designated Experts determine that there is a compelling reason to allow an exception.

2.2.1. Registering Extension Identifiers

WebAuthn extension identifiers registry are registered using the Specification Required policy (see Section 4.6 of [RFC8126]).

The WebAuthn extension identifiers registry is located at https://www.iana.org/assignments/webauthn. Registration requests can be made by following the instructions located there, or by sending an e-mail to the webauthn-reg-review@ietf.org mailing list.

Registration requests consist of at least the following information:

WebAuthn Extension Identifier

An identifier meeting the requirements given above in Section 2.2.
Description

A relatively short description of the extension.
Reference

Reference to the specification of the extension.
Notes

[optional]

Registrations MUST reference a freely available, stable specification, e.g., as described in Section 4.6 of [RFC8126]. This specification MUST include security and privacy considerations relevant to the extension.

Note that WebAuthn extensions can be registered by third parties (including the expert(s) themselves), if the expert(s) determine that an unregistered extension is widely deployed and not likely to be registered in a timely manner otherwise. Such registrations still are subject to the requirements defined, including the need to reference a specification.

2.2.2. Registration Request Processing

As noted in Section 2.2.1, WebAuthn extension identifiers are registered using the Specification Required policy.

The expert(s) will clearly identify any issues which cause a registration to be refused.

When a request is approved, the expert(s) will inform IANA, and the registration will be processed. The IESG is the arbiter of any objection.

2.2.3. Initial WebAuthn Extension Identifier Registry Values

The initial values for the WebAuthn Extension Identifier Registry are to be populated from the values listed in "WebAuthn Extension Identifier Registrations" of [WebAuthn].

3. Security Considerations

See [WebAuthn] for relevant security considerations.

4. Acknowledgements

Thanks to Mark Nottingham for valuable comments and suggestions. Thanks to Kathleen Moriarty and Benjamin Kaduk for their Area Director sponsorship of this specification. Thanks to Sarah Banks, Murray Kucherawy, Paul Kyzivat, and Hilarie Orman for their reviews.

5. Document History

[[ to be removed by the RFC Editor before publication as an RFC ]]

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6. Normative References

[RFC20] Cerf, V., "ASCII format for Network Interchange", STD 80, RFC 20, October 1969.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997.
[RFC5234] Crocker, D. and P. Overell, "Augmented BNF for Syntax Specifications: ABNF", STD 68, RFC 5234, DOI 10.17487/RFC5234, January 2008.
[RFC8126] Cotton, M., Leiba, B. and T. Narten, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 8126, DOI 10.17487/RFC8126, June 2017.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017.
[WebAuthn] Balfanz, D., Czeskis, A., Hodges, J., Jones, J., Jones, M., Kumar, A., Liao, A., Lindemann, R. and E. Lundberg, "Web Authentication: An API for accessing Public Key Credentials", World Wide Web Consortium (W3C) Recommendation, March 2019.

Authors' Addresses

Jeff Hodges Google 1600 Amphitheater Parkway Mountain View, California 94043 US EMail: jdhodges@google.com URI: https://kingsmountain.com/people/Jeff.Hodges/
Giridhar Mandyam Qualcomm Technologies Inc. 5775 Morehouse Drive San Diego, California 92121 USA Phone: +1 858 651 7200 EMail: mandyam@qti.qualcomm.com
Michael B. Jones Microsoft EMail: mbj@microsoft.com URI: https://self-issued.info/