Link relationship types for authentication
draft-pot-authentication-link-01

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Network Working Group                                             E. Pot
Internet-Draft                                          October 02, 2019
Intended status: Standards Track
Expires: April 4, 2020

               Link relationship types for authentication
                    draft-pot-authentication-link-01

Abstract

   This specification defines a set of relationships that may be used to
   indicate where a user may authenticate, log out, register a new
   account or find out who is currently authenticated.

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1.  Introduction

   [RFC8288] defines a framework and registry for Link Relationships
   types.  This specification defines a set of new relationship types to
   aid clients in discovering endpoints for authentication and
   registration: "authenticate", "authenticated-as", "logout" and
   "register-user".

1.1.  Usage examples

1.1.1.  Browsers

   Many websites already provide these features.  If these links are
   annotated with a standard relationship type, it might allow browser
   extensions to automatically discover these and present them in new
   ways.  It could for example show a browser-level logout button.

   Link relationships such as these could appear on any page where Sign
   in, Register, Log in or Log out features exist.

1.1.2.  Web services

   Many webservices provide a resource to discover more information
   about the authenticated entity.  Creating standard link relationships
   might allow a generic client to discover information about the
   currently logged in user.

   Similarly, an "authenticate" link could allow a generic client to
   find an OAuth2 Authorization endpoint.

   This link relationship could appear on any API endpoint where this
   might be relevant, or it might just show up on central endpoint
   discovery document.

2.  authenticate

   The "authenticate" can be used to link to a resource that hosts a
   page where a user can authenticate itself for the current resource.

   For example, this link might refer to a HTML login page.

   Example:

   <a href="/login" rel="authenticate">Login</a>

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3.  authenticated-as

   The "authenticated-as" link refers to a resource that describes the
   effective authenticated user for a HTTP response.

   Following this link might allow a client to answer the question 'who
   am I?'.  This might link to a user profile page, or it might link to
   an API that returns a JSON response with user information.

   Example:

   Link: <https://api.example.org/users/123-abc>; rel="authenticated-as"

4.  logout

   The "logout" refers to a resource where an authenticated user might
   end their session.

   In a browser this might clear cookies, or in the case of OAuth2 it
   could revoke any active authentication tokens.

5.  register-user

   The "register-user" Link Relation refers to a resource where a user
   might sign up for a service for the context URI.

   The linked resource might contain a HTML registration form, or
   otherwise instructions that allow a client to find out how to sign up
   for the service.

6.  IANA considerations

   This document defines "authenticate", "authenticated-as", "logout"
   and "register-user" link relation types and adds them to the "Link
   Relations" registry:

6.1.  authenticate link relation
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