Link Type Registrations for OAuth 2
draft-wmills-oauth-lrdd-06.txt

Abstract

Defines link type registrations for the OAuth 2 authentication framework and OAuth 1.0a.

Status of This Memo

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Copyright Notice

Copyright (c) 2012 IETF Trust and the persons identified as the document authors. All rights reserved.

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Table of Contents

• 1. Introduction
• 2. Terminology
• 3. OAuth 2 Link Types
• 3.1. OAuth 2 Authorization Endpoint
• 3.2. OAuth 2 Token Endpoint
• 4. OAuth 1.0a Link Types
• 4.1. OAuth 1.0a Request Initiation Endpoint
• 4.2. OAuth 1.0a Authorization Endpoint
• 4.3. OAuth 1.0a Token Endpoint
• 5. Security Considerations
• 6. IANA Considerations
• 6.1. Link Type Registration
• 6.1.1. OAuth 2 Authorization Endpoint
• 6.1.2. OAuth 2 Token Endpoint
• 6.1.3. OAuth 1.0a Request Initiation Endpoint
• 6.1.4. OAuth 1.0a Authorization Endpoint
• 6.1.5. OAuth 1.0a Token Endpoint
• 7. References
• 7.1. Normative References
• 7.2. Informative References
• Appendix A. Document History
• Author's Address

1. Introduction

This document defines the link type [RFC5988] registrations for the OAuth 2 [I-D.ietf-oauth-v2] authentication framework and for OAuth 1.0a [RFC5849]. These link types are used during the endpoint discovery process using Web Host Metadata [RFC6415] and Webfinger [I-D.ietf-appsawg-webfinger] by clients needing to discover the authorization, token, and initiation endpoints for a service or site.

2. Terminology

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].

The reader is assumed to be familiar with the terms used in the OAuth 2 and OAuth 1.0a specifcations.

3. OAuth 2 Link Types

OAuth 2 [I-D.ietf-oauth-v2] defines two endpoints which a site or domain might need to advertize via a mechanism such as Webfinger [I-D.ietf-appsawg-webfinger]. These are the user authorization endpoint (usually expected to be a web page the user interacts with) and the token endpoint used for obtaining tokens used to access protected resources. These are described in detail in the OAuth 2 specification.

3.1. OAuth 2 Authorization Endpoint

This link type indicates an OAuth 2 authorization endpoint to be used for user authentication/authorization to grant access to a protected resource.

3.2. OAuth 2 Token Endpoint

The OAuth 2 token endpoint to be used for obtaining tokens to access protected services. This link type has two link-extensions:

• grant-types:

  A space separated list of OAuth 2 grant types (see section 4 of [I-D.ietf-oauth-v2]) that can be used at the token endpoint to obtain a token. This is not an exclusive list, it provides a hint to the application of what SHOULD be valid. A token endpoint MAY support additional grant types not advertised by a discovery service. The client MAY use this to determine the grant types available for use.

  token-types:

  A space separated list of OAuth 2 token types (see section 7.1 of [I-D.ietf-oauth-v2]) that may be issued by the token endpoint. It is possible for a token endpoint to issue multiple tokens, and types may vary based on scope or other factors. This is not an exclusive list, it provides a hint to the application of what SHOULD be valid, and it MAY be used by a client to determine if the client supports one or more of the token type(s) available.

4. OAuth 1.0a Link Types

The OAuth 1.0a [RFC5849] protocol defines three endpoints that a site supporting OAuth 1.0a might advertize via a mechanism like Webfinger: the request initiation endpoint, the authorization endpoint, and the token endpoint. These are descibed in detail in the OAuth 1.0a specification.

4.1. OAuth 1.0a Request Initiation Endpoint

The OAuth 1.0a endpoint used to initiate the sequence, this short lived request is what the user approves to grant access to the resource.

4.2. OAuth 1.0a Authorization Endpoint

The OAuth 1.0a authorization endpoint used to approve an access request. This is expected to be a user facing web interface.

4.3. OAuth 1.0a Token Endpoint

The OAuth 1.0a token API endpoint used to exchange an approved access request for a token, used by the client once the resource owner has approved the access request.

5. Security Considerations

This document is informational, defining values in existing registries, and as such has no security properties to discuss.

6. IANA Considerations

6.1. Link Type Registration

Pursuant to [RFC5988] The following link type registrations [[will be]] registered by mail to link-relations@ietf.org.

6.1.1. OAuth 2 Authorization Endpoint

• Relation Name: oauth2-authorize
• Description: An OAuth 2 authorization endpoint to be used for user authentication/authorization to grant access to a protected resource.
• Reference: Section 3.1 of [[This Document]]
• Notes:
• Application Data: N/A

6.1.2. OAuth 2 Token Endpoint

• Relation Name: oauth2-token
• Description: The OAuth 2 token endpoint to be used for obtaining tokens use to access a protected resource.
• Reference: Section 3.2 of [[This Document]]
• Notes: This link type has two link extension parameters: "grant-types" and "token-types".
• Application Data: N/A

6.1.3. OAuth 1.0a Request Initiation Endpoint

• Relation Name: oauth-initiate
• Description: The OAuth 1.0a request initiation endpoint used to get an access request.
• Reference: Section 4.1 of [[This Document]]
• Notes:
• Application Data: N/A

6.1.4. OAuth 1.0a Authorization Endpoint

• Relation Name: oauth-authorize
• Description: The OAuth 1.0a authorization endpoint used to approve an access request.
• Reference: Section 4.2 of [[This Document]]
• Notes:
• Application Data: N/A

6.1.5. OAuth 1.0a Token Endpoint

• Relation Name: oauth-token
• Description: The OAuth 1.0a token API endpoint used to exchange an approved access request for a token, used by the client once the resource owner has approved the access request.
• Reference: Section 4.3 of [[This Document]]
• Notes:
• Application Data: N/A

7. References

7.1. Normative References

7.2. Informative References

Appendix A. Document History

[[ to be removed by RFC editor before publication as an RFC ]]

-06

• Restructured the link extensions dscription into the prose, simplifying the IANA section.

-05

• Changed the references to [[this document]] in the IANA parts.
• Added a small ammount of text.

-04

• Fixed the title.
• Removed the examples.

-03

• Corrected more typos and fixed the XRD for the examples, and small changes in the prose.

-02

• Corrected typos. Added and example.

-01

• Editorial changes, corrected authenticate to authrorize is most places, and added examples.

-00

• Initial revision

Author's Address