Kitten T. Hansen
Internet-Draft AT&T Laboratories
Updates: 5802 (if approved) April 11, 2014
Intended status: Informational
Expires: October 13, 2014
SCRAM-SHA-256 and SCRAM-SHA-256-PLUS SASL Mechanisms
draft-hansen-scram-sha256-00
Abstract
This document registers the SASL mechanisms SCRAM-SHA-256 and SCRAM-
SHA-256-PLUS. It also updates RFC 5802 in minor ways.
Status of This Memo
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This Internet-Draft will expire on October 13, 2014.
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Internet-Draft SASL SCRAM-SHA-256/SCRAM-SHA-256-PLUS April 2014
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. SCRAM-SHA-256 and SCRAM-SHA-256-PLUS . . . . . . . . . . . . 2
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
4. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4
5. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
5.1. Normative References . . . . . . . . . . . . . . . . . . 4
5.2. Informative References . . . . . . . . . . . . . . . . . 4
5.3. URIs . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 4
1. Introduction
This document registers the SASL mechanisms SCRAM-SHA-256 and SCRAM-
SHA-256-PLUS.
The registration form for the SCRAM is also updated.
Note: this paragraph may be removed before publication.
This document was written because [RFC5802] requires that new SASL
mechanisms in the SCRAM family be subject to IETF review. This
document is being discussed on the kitten@ietf.org [1] mailing list.
2. SCRAM-SHA-256 and SCRAM-SHA-256-PLUS
The SCRAM-SHA-256 and SCRAM-SHA-256-PLUS SASL mechanism are defined
in the same way that SCRAM-SHA-1 and SCRAM-SHA-1-PLUS are defined in
[RFC5802], except that the hash function for HMAC() and H() uses
SHA-256 instead of SHA-1 [RFC6234].
For the SCRAM-SHA-256/SCRAM-SHA-256-PLUS SASL mechanisms, servers
SHOULD announce a hash iteration-count of at least 4096.
!!!!!!!!!!!!!!!! Note that the appropriate value to specify here is
being actively discussed. !!!!!!!!!!!!!!!!
The GSS-API mechanism OID for SCRAM-SHA-256 is [to be assigned by
IANA] (see Section 3).
This is a simple example of a SCRAM-SHA-256 authentication exchange
when the client doesn't support channel bindings (username 'user' and
password 'pencil' are used):
C: n,,n=user,r=rOprNGfwEbeRWgbNEkqO
S: r=rOprNGfwEbeRWgbNEkqO%hvYDpWUa2RaTCAfuxFIlj)hNlF$k0,
s=W22ZaJ0SNY7soEsUEjb6gQ==,i=4096
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C: c=biws,r=rOprNGfwEbeRWgbNEkqO%hvYDpWUa2RaTCAfuxFIlj)hNlF$k0,
p=dHzbZapWIk4jUhN+Ute9ytag9zjfMHgsqmmiz7AndVQ=
S: v=6rriTRBi23WpRR/wtup+mMhUZUn/dB5nLTJRsjl95G4=
3. IANA Considerations
The IANA registry for the SCRAM family of SASL mechanisms is updated
as follows:
To: iana@iana.org
Subject: Registration of a new SASL family SCRAM
SASL mechanism name (or prefix for the family): SCRAM-*
Security considerations: Section 7 of [RFC5802]
Published specification (optional, recommended): [RFC5802]
Person & email address to contact for further information: IETF
KITTEN WG kitten@ietf.org
Intended usage: COMMON
Owner/Change controller: IESG iesg@ietf.org
Note: Members of this family MUST be explicitly registered using
the "IETF Review" [RFC5226] registration procedure. Reviews MUST
be requested on the KITTEN mailing list kitten@ietf.org (or a
successor designated by the responsible Security AD).
Note to future SCRAM-mechanism designers: each new SCRAM-SASL
mechanism MUST be explicitly registered with IANA and MUST comply
with SCRAM-mechanism naming convention defined in Section 4 of
[RFC5802].
IANA has added the following entries to the SASL Mechanism
registry established by [RFC4422]:
To: iana@iana.org
Subject: Registration of a new SASL mechanism SCRAM-SHA-256
SASL mechanism name (or prefix for the family): SCRAM-SHA-256
Security considerations: Section 7 of [RFC5802]
Published specification (optional, recommended): [RFC5802]
Person & email address to contact for further information: IETF
KITTEN WG kitten@ietf.org
Intended usage: COMMON
Owner/Change controller: IESG iesg@ietf.org
Note:
To: iana@iana.org
Subject: Registration of a new SASL mechanism SCRAM-SHA-256-PLUS
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SASL mechanism name (or prefix for the family): SCRAM-SHA-256-PLUS
Security considerations: Section 7 of [RFC5802]
Published specification (optional, recommended): [RFC5802]
Person & email address to contact for further information: IETF
KITTEN WG kitten@ietf.org
Intended usage: COMMON
Owner/Change controller: IESG iesg@ietf.org
Note:
IANA needs to assign a GSS-API mechanism OID for SCRAM-SHA-256
from the iso.org.dod.internet.security.mechanisms prefix (see the
"SMI Security for Mechanism Codes" registry).
4. Acknowledgements
This document benefited from discussions on the KITTEN WG mailing
list. The author would like to specially thank ...
5. References
5.1. Normative References
[RFC5802] Newman, C., Menon-Sen, A., Melnikov, A., and N. Williams,
"Salted Challenge Response Authentication Mechanism
(SCRAM) SASL and GSS-API Mechanisms", RFC 5802, July 2010.
[RFC6234] Eastlake, D. and T. Hansen, "US Secure Hash Algorithms
(SHA and SHA-based HMAC and HKDF)", RFC 6234, May 2011.
5.2. Informative References
[RFC4422] Melnikov, A. and K. Zeilenga, "Simple Authentication and
Security Layer (SASL)", RFC 4422, June 2006.
[RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 5226,
May 2008.
5.3. URIs
[1] mailto:kitten@ietf.org
Author's Address
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Internet-Draft SASL SCRAM-SHA-256/SCRAM-SHA-256-PLUS April 2014
Tony Hansen
AT&T Laboratories
200 Laurel Ave. South
Middletown, NJ 07748
USA
Email: tony+scramsha256@maillennium.att.com
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