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
|
|
---|---|---|---|
Authors | Simo Sorce , Taylor Yu | ||
Last updated | 2016-03-03 | ||
Replaces | draft-ietf-krb-wg-cammac | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
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) | |
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Stephen Farrell | ||
Send notices to | (None) | ||
IANA | IANA review state | IANA OK - No Actions Needed | |
IANA action state | No IANA Actions |
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 [RFC4120] is a means for KDCs to include positive or permissive (rather than restrictive) authorization data in service tickets in a way that the service named in a ticket can verify that the KDC has Sorce & Yu Standards Track [Page 2] RFC 7751 Container Authenticated by Multiple MACs March 2016Show full document text