Authentication Indicator in Kerberos Tickets
draft-ietf-kitten-krb-auth-indicator-01

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Document Type Active Internet-Draft (kitten WG)
Last updated 2016-05-16
Replaces draft-jain-kitten-krb-auth-indicator
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Internet Engineering Task Force                                  A. Jain
Internet-Draft                                              Georgia Tech
Updates: 4120 (if approved)                                    N. Kinder
Intended status: Standards Track                             N. McCallum
Expires: November 17, 2016                                 Red Hat, Inc.
                                                            May 16, 2016

              Authentication Indicator in Kerberos Tickets
                draft-ietf-kitten-krb-auth-indicator-01

Abstract

   This document proposes an extension in the Kerberos protocol
   [RFC4120].  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 the service tickets so that the application
   services can use it as an input into policy decisions.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on November 17, 2016.

Copyright Notice

   Copyright (c) 2016 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

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   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Document Conventions  . . . . . . . . . . . . . . . . . . . .   2
   3.  AD Type Specification . . . . . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     5.2.  Informative References  . . . . . . . . . . . . . . . . .   4
   Appendix A.  ASN.1 Module . . . . . . . . . . . . . . . . . . . .   4
   Appendix B.  Acknowledgements . . . . . . . . . . . . . . . . . .   5

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 or Public Key Cryptography.  Implementations that
   have Pre-Authentication mechanisms offering significantly different
   strengths of client authentication may choose to keep track of the
   strength of the authentication used as an input into policy
   decisions.

   This document proposes a new Authorization Data Type to be used to
   convey the authentication strength to the application services.  The
   KDC can provide the DER encoding of the ASN.1 type defined in this
   document into the ad-data field of the AD-CAMMAC [RFC7751] container.
   This ASN.1 type contains information about the type of authentication
   mechanism used by the Kerberos client to authenticate itself to the
   KDC.

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].

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3.  AD Type Specification

   The KDC MAY include the following Authorization Data element, wrapped
   in AD-CAMMAC, in the initial credentials and copy it from a ticket-
   granting ticket into service tickets:

   AD-AUTHENTICATION-INDICATOR 97

   The corresponding ad-data field contains the DER encoding of the
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