Internet Engineering Task Force

Kerberos (krb-wg)

In addition to this official charter maintained by the IETF Secretariat, there is additional information about this working group on the Web at:
Additional KRB-WG Web Page

Last Modified: 2010-03-25

Additional information is available at tools.ietf.org/wg/krb-wg

Chair(s):

Security Area Director(s):

Security Area Advisor:

Tim Polk <tim.polk@nist.gov>

Mailing Lists:

General Discussion: ietf-krb-wg@lists.anl.gov
To Subscribe: https://lists.anl.gov/mailman/listinfo/ietf-krb-wg
Archive: https://lists.anl.gov/pipermail/ietf-krb-wg/

Description of Working Group:

Kerberos over the years has been ported to virtually every operating
system. There are at least two open source versions, with numerous
commercial versions based on these and other proprietary
implementations. Kerberos evolution has continued in recent years, with
the development of a new crypto framework, publication of a new version
of the Kerberos specification, support for initial authentication using
public keys, and numerous extensions developed in and out of the IETF.

However, wider deployment and advances in technology bring with them
both new challenges and new opportunities, particularly with regard to
making initial authentication of users to the Kerberos system both
convenient and secure. In addition, several key features remain undefined.

The Kerberos Working Group will continue to improve the core Kerberos
specification, develop extensions to address new needs and technologies
related to improving the process of client authentication, and produce
specifications for missing functionality.

Specifically, the Working Group will:

* Complete existing work:
- ECC for PKINIT (draft-zhu-pkinit-ecc-03.txt)
- Set/Change Password
(draft-ietf-krb-wg-kerberos-set-passwd-05.txt)
- Naming Constraints (draft-ietf-krb-wg-naming-02.txt)
- Anonymity (draft-ietf-krb-wg-anon-03.txt)
- Hash agility for GSS-KRB5
(draft-ietf-krb-wg-gss-cb-hash-agility-00.txt)
- Hash agility for PKINIT (draft-ietf-krb-wg-pkinit-alg-agility-01.txt)
- Referrals (draft-ietf-krb-wg-kerberos-referrals-08.txt)

* Prepare and advance a specification for an updated, backward-
compatible version of the Kerberos version 5 protocol which supports
non-ASCII principal and realm names, salt strings, and passwords;
insures that those portions of the protocol which are not encrypted are
nonetheless authenticated whenever possible; and enables future protocol
revisions and extensions.

* Develop extensions which reduce or eliminate exposure of Kerberos
clients' long-term keys to attack and enable the use of alternate
mechanisms for initial authentication. This task will comprise the
following items:
- A model and framework for preauthentication mechanisms
- A mechanism for providing a protected channel for carrying
preauthentication data and/or a reply key between a Kerberos
client and KDC, within the KDC_REQ/KDC_REP exchange.
- Support for One-Time Passwords
- Support for hardware authentication tokens
- Support for using TLS to secure communications with Kerberos KDCs.

* Examine issues related to the current cross-realm model, produce a
list of problems to be solved, and evaluate approaches to solving them.

* Develop extensions to Kerberos and a GSS-API mechanism (IAKERB) to
enable Kerberos clients to communicate with a KDC by using a GSS-API
acceptor as a proxy.

* Produce a data model for information needed by the KDC, and an LDAP
schema for management of that data.

Goals and Milestones:

Done		First meeting
Done		Submit the Kerberos Extensions document to the IESG for consideration as a Proposed standard.
Done		Complete first draft of Pre-auth Framework
Done		Complete first draft of Extensions
Done		Submit K5-GSS-V2 document to IESG for consideration as a Proposed Standard
Done		Last Call on OCSP for PKINIT
Done		Consensus on direction for Change/Set password
Done		PKINIT to IESG
Done		Enctype Negotiation to IESG
Done		Last Call on PKINIT ECC
Done		TCP Extensibility to IESG
Done		ECC for PKINIT to IESG
Done		Naming Constraints to IESG
Done		Anonymity to IESG
Done		WGLC on preauth framework
Done		WGLC on OTP
Done		WGLC on data model
Done		WGLC on cross-realm issues
Jan 2008		WGLC on Referrals
Dec 2008		Set/Change Password to IESG
Dec 2008		Hash agility for GSS-KRB5 to IESG
Dec 2008		Hash agility for PKINIT to IESG
Dec 2008		Anonymity back to IESG
Done		WGLC on IAKERB
Done		WGLC on STARTTLS
Feb 2009		Data Model to IESG
Feb 2009		OTP to IESG
Apr 2010		WGLC on DHCPv6 Option

Internet-Drafts:

A Generalized Framework for Kerberos Pre-Authentication (127013 bytes)
Using Kerberos V5 over the Transport Layer Security (TLS) protocol (18103 bytes)
Problem statement on the cross-realm operation of Kerberos (30700 bytes)
OTP Pre-authentication (87361 bytes)
An information model for Kerberos version 5 (25827 bytes)
Kerberos Option for DHCPv6 (35214 bytes)
Deprecate DES support for Kerberos (8597 bytes)
Kerberos number registry to IANA (8294 bytes)

Request For Comments:

AES Encryption for Kerberos 5 (RFC 3962) (32844 bytes)
Encryption and Checksum Specifications for Kerberos 5 (RFC 3961) (111865 bytes)
The Kerberos Network Authentication Service (V5) (RFC 4120) (340314 bytes) obsoletes RFC 1510/ updated by RFC 4537,RFC 5021
The Kerberos Version 5 Generic Security Service Application Program Interface (GSS-API) Mechanism: Version 2 (RFC 4121) (43945 bytes) updates RFC 1964
Kerberos Cryptosystem Negotiation Extension (RFC 4537) (11166 bytes) updates RFC 4120
Online Certificate Status Protocol (OCSP) Support for Public Key Cryptography for Initial Authentication in Kerberos (PKINIT) (RFC 4557) (11593 bytes)
Public Key Cryptography for Initial Authentication in Kerberos (PKINIT) (RFC 4556) (100339 bytes)
Extended Kerberos Version 5 Key Distribution Center (KDC) Exchanges Over TCP (RFC 5021) (13431 bytes) updates RFC 4120
Elliptic Curve Cryptography (ECC) Support for Public Key Cryptography for Initial Authentication in Kerberos (PKINIT) (RFC 5349) (19706 bytes)