Kerberos Authorization Data Container Authenticated by Multiple Message Authentication Codes (MACs)
RFC 7751

Document Type RFC - Proposed Standard (March 2016; No errata)
Updates RFC 4120
Last updated 2016-03-03
Replaces draft-ietf-krb-wg-cammac
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Benjamin Kaduk
Shepherd write-up Show (last changed 2015-11-18)
IESG IESG state RFC 7751 (Proposed Standard)
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Responsible AD Stephen Farrell
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Internet Engineering Task Force (IETF)                          S. Sorce
Request for Comments: 7751                                       Red Hat
Updates: 4120                                                      T. Yu
Category: Standards Track                                            MIT
ISSN: 2070-1721                                               March 2016

    Kerberos Authorization Data Container Authenticated by Multiple
                  Message Authentication Codes (MACs)

Abstract

   This document specifies a Kerberos authorization data container that
   supersedes AD-KDC-ISSUED.  It allows for multiple Message
   Authentication Codes (MACs) or signatures to authenticate the
   contained authorization data elements.  The multiple MACs are needed
   to mitigate shortcomings in the existing AD-KDC-ISSUED container.
   This document updates RFC 4120.

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 5741.

   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/rfc7751.

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
   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.

Sorce & Yu                   Standards Track                    [Page 1]
RFC 7751        Container Authenticated by Multiple MACs      March 2016

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   2
   3.  Motivations . . . . . . . . . . . . . . . . . . . . . . . . .   2
   4.  Encoding  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   6.  Assigned Numbers  . . . . . . . . . . . . . . . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   This document specifies a new authorization data container for
   Kerberos, called the CAMMAC (Container Authenticated by Multiple
   MACs).  The Abstract Syntax Notation One (ASN.1) type implementing
   the CAMMAC concept is the AD-CAMMAC, which supersedes the AD-KDC-
   ISSUED authorization data type specified in [RFC4120].  This new
   container allows both the receiving application service and the Key
   Distribution Center (KDC) itself to verify the authenticity of the
   contained authorization data.  The AD-CAMMAC container can also
   include additional verifiers that "trusted services" can use to
   verify the contained authorization data.

2.  Requirements Language

   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.  Motivations

   The Kerberos protocol allows clients to submit arbitrary
   authorization data for a KDC to insert into a Kerberos ticket.  These
   client-requested authorization data allow the client to express
   authorization restrictions that the application service will
   interpret.  With few exceptions, the KDC can safely copy these
   client-requested authorization data to the issued ticket without
   necessarily inspecting, interpreting, or filtering their contents.

   The AD-KDC-ISSUED authorization data container specified in RFC 4120
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