Mutual TLS Profile for OAuth 2.0
draft-ietf-oauth-mtls-05

Document Type Active Internet-Draft (oauth WG)
Last updated 2017-11-12
Replaces draft-campbell-oauth-mtls
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OAuth Working Group                                          B. Campbell
Internet-Draft                                             Ping Identity
Intended status: Standards Track                              J. Bradley
Expires: May 16, 2018                                             Yubico
                                                             N. Sakimura
                                               Nomura Research Institute
                                                          T. Lodderstedt
                                                           YES Europe AG
                                                       November 12, 2017

                    Mutual TLS Profile for OAuth 2.0
                        draft-ietf-oauth-mtls-05

Abstract

   This document describes Transport Layer Security (TLS) mutual
   authentication using X.509 certificates as a mechanism for OAuth
   client authentication to the authorization sever as well as for
   certificate bound sender constrained access tokens.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on May 16, 2018.

Copyright Notice

   Copyright (c) 2017 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
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect

Campbell, et al.          Expires May 16, 2018                  [Page 1]
Internet-Draft              OAuth Mutual TLS               November 2017

   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Notation and Conventions . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Mutual TLS for OAuth Client Authentication  . . . . . . . . .   4
     2.1.  PKI Mutual TLS OAuth Client Authentication Method . . . .   4
       2.1.1.  PKI Authentication Method Metadata Value  . . . . . .   5
       2.1.2.  Client Registration Metadata  . . . . . . . . . . . .   5
     2.2.  Self-Signed Certificate Mutual TLS OAuth Client
           Authentication Method . . . . . . . . . . . . . . . . . .   5
       2.2.1.  Self-Signed Certificate Authentication Method
               Metadata Value  . . . . . . . . . . . . . . . . . . .   6
       2.2.2.  Client Registration Metadata  . . . . . . . . . . . .   6
   3.  Mutual TLS Sender Constrained Resources Access  . . . . . . .   6
     3.1.  X.509 Certificate Thumbprint Confirmation Method for JWT    7
     3.2.  Confirmation Method for Token Introspection . . . . . . .   8
     3.3.  Authorization Server Metadata . . . . . . . . . . . . . .   9
     3.4.  Client Registration Metadata  . . . . . . . . . . . . . .   9
   4.  Implementation Considerations . . . . . . . . . . . . . . . .  10
     4.1.  Authorization Server  . . . . . . . . . . . . . . . . . .  10
     4.2.  Resource Server . . . . . . . . . . . . . . . . . . . . .  10
     4.3.  Sender Constrained Access Tokens Without Client
           Authentication  . . . . . . . . . . . . . . . . . . . . .  10
     4.4.  Certificate Bound Access Tokens . . . . . . . . . . . . .  11
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
     5.1.  JWT Confirmation Methods Registration . . . . . . . . . .  11
     5.2.  OAuth Authorization Server Metadata Registration  . . . .  11
     5.3.  Token Endpoint Authentication Method Registration . . . .  12
     5.4.  OAuth Token Introspection Response Registration . . . . .  12
     5.5.  OAuth Dynamic Client Registration Metadata Registration .  12
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
     6.1.  TLS Versions and Best Practices . . . . . . . . . . . . .  13
     6.2.  X.509 Certificate Spoofing  . . . . . . . . . . . . . . .  13
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