W3C WebAuthn Working Group J. Hodges
Internet-Draft Google
Intended status: Informational G. Mandyam
Expires: September 7, 2020 Qualcomm Technologies Inc.
M. Jones
Microsoft
March 6, 2020
Registries for Web Authentication (WebAuthn)
draft-hodges-webauthn-registries-05
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 [1].
The most recent _published_ draft revision is at
https://tools.ietf.org/html/draft-hodges-webauthn-registries [2].
The editors' draft is at https://github.com/w3c/webauthn/blob/master/
draft-hodges-webauthn-registries.txt [3]
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 [4]
Status of This Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
2.1. WebAuthn Attestation Statement Format Identifier Registry 3
2.1.1. Registering Attestation Statement Format Identifiers 4
2.1.2. Registration Request Processing . . . . . . . . . . . 4
2.1.3. Initial WebAuthn Attestation Statement Format
Identifier Registry Values . . . . . . . . . . . . . 5
2.2. WebAuthn Extension Identifier Registry . . . . . . . . . 5
2.2.1. Registering Extension Identifiers . . . . . . . . . . 5
2.2.2. Registration Request Processing . . . . . . . . . . . 6
2.2.3. Initial WebAuthn Extension Identifier Registry Values 6
3. Security Considerations . . . . . . . . . . . . . . . . . . . 6
4. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 7
5. Document History . . . . . . . . . . . . . . . . . . . . . . 7
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.1. Normative References . . . . . . . . . . . . . . . . . . 8
6.2. URIs . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9
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.
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2. IANA Considerations
This specification establishes two registries:
o the "WebAuthn Attestation Statement Format Identifier" registry;
see Section 2.1.
o the "WebAuthn Extension Identifier" registry; see Section 2.2.
[[ 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 outlined
below:
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.
Note that the expert(s) are allowed (as per Section 2.1.1 and
Section 2.2.1) to define additional fields to be collected in the
registry.
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" [5], 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. The Experts(s) MAY also designate attestation
statement formats as proprietary if they lack complete
specifications, and will assign a prefix indicating as such to the
identifier.
Registered attestation statement format identifiers MUST be a maximum
of 32 octets in length and MUST consist only of printable USASCII
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
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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]), which implies review and approval by a designated expert.
The WebAuthn attestation statement format identifiers registry is
located at https://www.iana.org/assignments/webauthn [6].
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:
o *WebAuthn Attestation Statement Format Identifier*: An identifier
meeting the requirements given above in Section 2.1.
o *Description*: A relatively short description of the attestation
format.
o *Reference*: Reference to the specification of the attestation
statement format.
o Notes: [optional]
The expert(s) can define additional fields to be collected in the
registry.
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,
implying review and approval by a designated expert.
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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" [7]
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" [8].
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 USASCII 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]), which
implies review and approval by a designated expert.
The WebAuthn extension identifiers registry is located at
https://www.iana.org/assignments/webauthn [9]. 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:
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o *WebAuthn Extension Identifier*: An identifier meeting the
requirements given above in Section 2.2.
o *Description*: A relatively short description of the extension.
o *Reference*: Reference to the specification of the extension.
o Notes: [optional]
The expert(s) can define additional fields to be collected in the
registry.
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, implying review
and approval by a designated expert.
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" [10] of [WebAuthn].
3. Security Considerations
See [WebAuthn] for relevant security considerations.
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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.
5. Document History
[[ to be removed by the RFC Editor before publication as an RFC ]]
-05
o Updated to address the solicited IANA review comments, per
discussions in an email thread between the authors and IANA (
"[IANA #1154148]" ).
-04
o Update per Benjamin Kaduk's further AD review: Remove 'final' wrt
IESG arbitrating objections; Add explicit requirement for
extension or attestation specs to include security and privacy
considerations.
o Update per IANA review: Move "IANA considerations section up in
doc to encompass (former) sections 2 and 3.
-03
o Update per Benjamin Kaduk's AD review. Align with RFC 8288,
rather than draft-nottingham-rfc5988bis.
-02
o Refresh now that the WebAuthn spec is at Recommendation (REC)
maturity level.
-01
o Refresh now that the WebAuthn Committee Recommendation (CR) draft
is pending.
-00
o Initial version, based on draft-nottingham-rfc5988bis.
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6. References
6.1. Normative References
[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>.
[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,
<https://www.w3.org/TR/2019/REC-webauthn-1-20190304/>.
6.2. URIs
[1] https://github.com/w3c/webauthn/
issues?q=is%3Aopen+is%3Aissue+label%3Aspec%3Awebauthn-registries
[2] https://tools.ietf.org/html/draft-hodges-webauthn-registries
[3] https://github.com/w3c/webauthn/blob/master/draft-hodges-
webauthn-registries.txt
[4] https://github.com/w3c/webauthn/
pulls?q=is%3Apr+label%3Aspec%3Awebauthn-registries
[5] https://www.w3.org/TR/webauthn/#sctn-attstn-fmt-ids
[6] https://www.iana.org/assignments/webauthn
[7] https://www.w3.org/TR/webauthn/#sctn-att-fmt-reg
[8] https://www.w3.org/TR/webauthn/#sctn-extension-id
[9] https://www.iana.org/assignments/webauthn
[10] https://www.w3.org/TR/webauthn/#sctn-extensions-reg
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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/
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