Registries for Web Authentication (WebAuthn)
RFC 8809

Document Type RFC - Informational (August 2020; No errata)
Last updated 2020-08-07
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Internet Engineering Task Force (IETF)                         J. Hodges
Request for Comments: 8809                                        Google
Category: Informational                                       G. Mandyam
ISSN: 2070-1721                               Qualcomm Technologies Inc.
                                                                M. Jones
                                                               Microsoft
                                                             August 2020

              Registries for Web Authentication (WebAuthn)

Abstract

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

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are candidates for any level of Internet
   Standard; see Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8809.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction
     1.1.  Requirements Notation and Conventions
   2.  IANA Considerations
     2.1.  WebAuthn Attestation Statement Format Identifiers Registry
       2.1.1.  Registering Attestation Statement Format Identifiers
       2.1.2.  Registration Request Processing
       2.1.3.  Initial Values in the WebAuthn Attestation Statement
               Format Identifiers Registry
     2.2.  WebAuthn Extension Identifiers Registry
       2.2.1.  Registering Extension Identifiers
       2.2.2.  Registration Request Processing
       2.2.3.  Initial Values in the WebAuthn Extension Identifiers
               Registry
   3.  Security Considerations
   4.  Normative References
   Acknowledgements
   Authors' Addresses

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:

   *  the "WebAuthn Attestation Statement Format Identifiers" registry
      (see Section 2.1)

   *  the "WebAuthn Extension Identifiers" registry (see Section 2.2)

   Any additional processes established by the expert(s) after the
   publication of this document will be recorded on the registry web
   page at the discretion of the expert(s).

2.1.  WebAuthn Attestation Statement Format Identifiers Registry

   WebAuthn attestation statement format identifiers are strings whose
   semantic, syntactic, and string-matching criteria are specified in
   the "Attestation Statement Format Identifiers"
   (https://www.w3.org/TR/2019/REC-webauthn-1-20190304/#sctn-attstn-fmt-
   ids) section of [WebAuthn], 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 double quote, i.e., VCHAR
   as defined in [RFC5234] but without %x22 and %x5c.  Attestation
   statement format identifiers are case sensitive and 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 email 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 in Section 2.1.

   Description:
      A relatively short description of the attestation format.

   Specification Document(s):
      Reference to the document or documents that specify the
      attestation statement format.

   Change Controller:
      For Standards Track RFCs, list "IETF".  For others, give the name
      of the responsible party.  Other details (e.g., postal address,
      email address, home page URI) may also be included.

   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) determines 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 that cause a
   registration to be refused, such as an incompletely specified
   attestation format.

   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 Values in the WebAuthn Attestation Statement Format
        Identifiers Registry

   The initial values for the "WebAuthn Attestation Statement Format
   Identifiers" registry have been populated with the values listed in
   the "WebAuthn Attestation Statement Format Identifier Registrations"
   (https://www.w3.org/TR/2019/REC-webauthn-1-20190304/#sctn-att-fmt-
   reg) section of [WebAuthn].  Also, the Change Controller entry for
   each of those registrations is:

   Change Controller:
      W3C Web Authentication Working Group (public-webauthn@w3.org)

2.2.  WebAuthn Extension Identifiers Registry

   WebAuthn extension identifiers are strings whose semantic, syntactic,
   and string-matching criteria are specified in the "Extension
   Identifiers" (https://www.w3.org/TR/2019/REC-webauthn-1-
   20190304/#sctn-extension-id) section of [WebAuthn].

   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 double quote, i.e., VCHAR as defined in [RFC5234] but
   without %x22 and %x5c.  Extension identifiers are case sensitive and
   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.

2.2.1.  Registering Extension Identifiers

   WebAuthn extension identifiers 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 email 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 in Section 2.2.

   Description:
      A relatively short description of the extension.

   Specification Document(s):
      Reference to the document or documents that specify the extension.

   Change Controller:
      For Standards Track RFCs, list "IETF".  For others, give the name
      of the responsible party.  Other details (e.g., postal address,
      email address, home page URI) may also be included.

   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) determines
   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 that cause a
   registration to be refused, such as an incompletely specified
   extension.

   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 Values in the WebAuthn Extension Identifiers Registry

   The initial values for the "WebAuthn Extension Identifiers" registry
   have been populated with the values listed in the "WebAuthn Extension
   Identifier Registrations" (https://www.w3.org/TR/2019/REC-webauthn-1-
   20190304/#sctn-extensions-reg) section of [WebAuthn].  Also, the
   Change Controller entry for each of those registrations is:

   Change Controller:
      W3C Web Authentication Working Group (public-webauthn@w3.org)

3.  Security Considerations

   See [WebAuthn] for relevant security considerations.

4.  Normative References

   [RFC20]    Cerf, V., "ASCII format for network interchange", STD 80,
              RFC 20, DOI 10.17487/RFC0020, October 1969,
              <https://www.rfc-editor.org/info/rfc20>.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC5234]  Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
              Specifications: ABNF", STD 68, RFC 5234,
              DOI 10.17487/RFC5234, January 2008,
              <https://www.rfc-editor.org/info/rfc5234>.

   [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,
              <https://www.rfc-editor.org/info/rfc8126>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [WebAuthn] Balfanz, D., Czeskis, A., Hodges, J., Jones, J.C., 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, 4 March 2019,
              <https://www.w3.org/TR/2019/REC-webauthn-1-20190304/>.

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 Amanda Baber,
   Sarah Banks, Alissa Cooper, Roman Danyliw, Murray Kucherawy, Paul
   Kyzivat, Barry Leiba, Hilarie Orman, Magnus Westerlund, and Robert
   Wilton for their reviews.

Authors' Addresses

   Jeff Hodges
   Google
   1600 Amphitheatre Parkway
   Mountain View, CA 94043
   United States of America

   Email: jdhodges@google.com
   URI:   https://kingsmountain.com/people/Jeff.Hodges/

   Giridhar Mandyam
   Qualcomm Technologies Inc.
   5775 Morehouse Drive
   San Diego, CA 92121
   United States of America

   Phone: +1 858 651 7200
   Email: mandyam@qti.qualcomm.com

   Michael B. Jones
   Microsoft

   Email: mbj@microsoft.com
   URI:   https://self-issued.info/