OAuth 2.0 Mutual TLS Client Authentication and Certificate Bound Access Tokens
draft-ietf-oauth-mtls-07

Document Type Active Internet-Draft (oauth WG)
Last updated 2018-01-30
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: August 2, 2018                                           Yubico
                                                             N. Sakimura
                                               Nomura Research Institute
                                                          T. Lodderstedt
                                                           YES Europe AG
                                                        January 29, 2018

OAuth 2.0 Mutual TLS Client Authentication and Certificate Bound Access
                                 Tokens
                        draft-ietf-oauth-mtls-07

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 as a method for a
   protected resource to ensure that an access token presented to it by
   a given client was issued to that client by the authorization server.

Status of This Memo

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

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   This Internet-Draft will expire on August 2, 2018.

Copyright Notice

   Copyright (c) 2018 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

Campbell, et al.         Expires August 2, 2018                 [Page 1]
Internet-Draft              OAuth Mutual TLS                January 2018

   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Notation and Conventions . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Mutual TLS for OAuth Client Authentication  . . . . . . . . .   4
     2.1.  PKI Mutual TLS OAuth Client Authentication Method . . . .   5
       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 . . . . . . . . . . . . . . . . . .   6
       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  . . . . . . .   7
     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
     4.5.  Implicit Grant Unsupported  . . . . . . . . . . . . . . .  11
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
     5.1.  TLS Versions and Best Practices . . . . . . . . . . . . .  11
     5.2.  X.509 Certificate Spoofing  . . . . . . . . . . . . . . .  12
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
     6.1.  JWT Confirmation Methods Registration . . . . . . . . . .  12
     6.2.  OAuth Authorization Server Metadata Registration  . . . .  12
     6.3.  Token Endpoint Authentication Method Registration . . . .  12
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