Authentication Indicator in Kerberos Tickets
RFC 8129

Document Type RFC - Proposed Standard (March 2017; No errata)
Updates RFC 4120
Last updated 2017-03-22
Replaces draft-jain-kitten-krb-auth-indicator
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Benjamin Kaduk
Shepherd write-up Show (last changed 2016-11-17)
IESG IESG state RFC 8129 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Stephen Farrell
Send notices to "Benjamin Kaduk" <kaduk@mit.edu>
IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                           A. Jain
Request for Comments: 8129                                  Georgia Tech
Updates: 4120                                                  N. Kinder
Category: Standards Track                                    N. McCallum
ISSN: 2070-1721                                            Red Hat, Inc.
                                                              March 2017

              Authentication Indicator in Kerberos Tickets

Abstract

   This document updates RFC 4120, as it specifies an extension in the
   Kerberos protocol.  It defines a new authorization data type,
   AD-AUTHENTICATION-INDICATOR.  The purpose of introducing this data
   type is to include an indicator of the strength of a client's
   authentication in service tickets so that application services can
   use it as an input into policy decisions.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc8129.

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
   (http://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
   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.

Jain, et al.                 Standards Track                    [Page 1]
RFC 8129                Authentication Indicator              March 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Document Conventions  . . . . . . . . . . . . . . . . . . . .   2
   3.  AD Type Specification . . . . . . . . . . . . . . . . . . . .   2
   4.  Assigned Numbers  . . . . . . . . . . . . . . . . . . . . . .   3
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Appendix A.  ASN.1 Module . . . . . . . . . . . . . . . . . . . .   6
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   Kerberos [RFC4120] allows secure interaction among users and services
   over a network.  It supports a variety of authentication mechanisms
   using its pre-authentication framework [RFC6113].  The Kerberos
   authentication service has been architected to support password-based
   authentication as well as multi-factor authentication using one-time
   password devices, public-key cryptography, and other
   pre-authentication schemes.  Implementations that offer
   pre-authentication mechanisms supporting significantly different
   strengths of client authentication may choose to keep track of the
   strength of the authentication that was used, for use as an input
   into policy decisions.

   This document specifies a new authorization data type to convey
   authentication strength information to application services.
   Elements of this type appear within an AD-CAMMAC (Authorization Data
   type Container Authenticated by Multiple Message Authentication
   Codes) [RFC7751] container.

2.  Document Conventions

   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 RFC 2119 [RFC2119].

3.  AD Type Specification

   The Key Distribution Center (KDC) MAY include authorization data of
   ad-type 97, wrapped in AD-CAMMAC, in initial credentials.  The KDC
   MAY copy it from a ticket-granting ticket into service tickets.
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