A Pseudo-Random Function (PRF) for the Kerberos V Generic Security Service Application Program Interface (GSS-API) Mechanism
RFC 7802
| Document | Type |
RFC - Proposed Standard
(March 2016; No errata)
Obsoletes RFC 4402
|
|
|---|---|---|---|
| Authors | Shawn Emery , Nicolás Williams | ||
| Last updated | 2018-12-20 | ||
| 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 2015-11-19) | ||
| IESG | IESG state | RFC 7802 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Stephen Farrell | ||
| Send notices to | "Benjamin Kaduk" <kaduk@mit.edu> | ||
| IANA | IANA review state | IANA OK - No Actions Needed | |
| IANA action state | No IANA Actions | ||
Internet Engineering Task Force (IETF) S. Emery
Request for Comments: 7802 Oracle
Obsoletes: 4402 N. Williams
Category: Standards Track Cryptonector
ISSN: 2070-1721 March 2016
A Pseudo-Random Function (PRF) for the Kerberos V Generic Security
Service Application Program Interface (GSS-API) Mechanism
Abstract
This document defines the Pseudo-Random Function (PRF) for the
Kerberos V mechanism for the Generic Security Service Application
Program Interface (GSS-API), based on the PRF defined for the
Kerberos V cryptographic framework, for keying application protocols
given an established Kerberos V GSS-API security context.
This document obsoletes RFC 4402 and reclassifies that document as
Historic. RFC 4402 starts the PRF+ counter at 1; however, a number
of implementations start the counter at 0. As a result, the original
specification would not be interoperable with existing
implementations.
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/rfc7802.
Emery & Williams Standards Track [Page 1]
RFC 7802 A PRF for the Kerberos V Mech March 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
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. Conventions Used in This Document . . . . . . . . . . . . . . 2
3. Kerberos V GSS Mechanism PRF . . . . . . . . . . . . . . . . 3
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
5. Security Considerations . . . . . . . . . . . . . . . . . . . 4
6. Normative References . . . . . . . . . . . . . . . . . . . . 4
Appendix A. Test Vectors . . . . . . . . . . . . . . . . . . . . 6
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
This document specifies the Kerberos V GSS-API mechanism's [RFC4121]
pseudo-random function corresponding to [RFC4401]. The function is a
"PRF+" style construction. For more information, see [RFC4401],
[RFC2743], [RFC2744], and [RFC4121].
This document obsoletes RFC 4402 and reclassifies that document as
Historic. RFC 4402 starts the PRF+ counter at 1; however, a number
of implementations start the counter at 0. As a result, the original
specification would not be interoperable with existing
implementations.
2. Conventions Used in This Document
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 [RFC2119].
Emery & Williams Standards Track [Page 2]
RFC 7802 A PRF for the Kerberos V Mech March 2016
3. Kerberos V GSS Mechanism PRF
The GSS-API PRF [RFC4401] function for the Kerberos V mechanism
[RFC4121] shall be the output of a PRF+ function based on the
encryption type's PRF function keyed with the negotiated session key
of the security context corresponding to the 'prf_key' input
parameter of GSS_Pseudo_random().
This PRF+ MUST be keyed with the key indicated by the 'prf_key' input
parameter as follows:
o GSS_C_PRF_KEY_FULL -- use the sub-session key asserted by the
acceptor (if any exists), or the sub-session asserted by the
initiator (if any exists), or the Ticket's session key.
o GSS_C_PRF_KEY_PARTIAL -- use the sub-session key asserted by the
initiator (if any exists) or the Ticket's session key.
The PRF+ function is a simple counter-based extension of the Kerberos
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