Kerberos (krb-wg) ----------------- Charter Last Modified: 2011-06-28 Current Status: Active Working Group Chair(s): Jeffrey Hutzelman Larry Zhu Sam Hartman Security Area Director(s): Stephen Farrell Sean Turner Security Area Advisor: Stephen Farrell 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 new crypto and preauthentication frameworks, support for initial authentication using public keys, improved support for protecting clients' long-term keys during initial authentication, support for anonymous and partially-anonymous authentication, 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, such as exploring support for new mechanisms for initial authentication, new cryptographic technologies, and better integration of Kerberos with other systems for authentication, authorization, and identity management. 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 the areas described above, and produce specifications for missing functionality. Specifically, the Working Group will: * Complete existing work, including: - DHCP Option (draft-sakane-dhc-dhcpv6-kdc-option-10.txt) - KDC Data Model (draft-ietf-krb-wg-kdc-model-09.txt) - One-Time Passwords (draft-ietf-krb-wg-otp-preauth-16.txt) - IAKERB (draft-ietf-krb-wg-iakerb-02.txt) - Single-DES Deprecation (draft-lha-des-die-die-die-05.txt) - IANA registry creation (draft-lha-krb-wg-some-numbers-to-iana) - Hash agility for GSS-KRB5 (draft-ietf-krb-wg-gss-cb-hash-agility-06.txt) - Hash agility for PKINIT (draft-ietf-krb-wg-pkinit-alg-agility-05.txt) - Referrals (draft-ietf-krb-wg-kerberos-referrals-12.txt) - Set/Change Password (draft-ietf-krb-wg-kerberos-set-passwd-08.txt) * Prepare and advance one or more standards-track specifications which update the Kerberos version 5 protocol to support non-ASCII principal and realm names, salt strings, and passwords, and localized error reporting. Maximizing backward compatibility is strongly desired. * Prepare and advance one or more standards-track specifications which update the Kerberos version 5 protocol in a backward-compatible way to support extending the unencrypted portion of a Kerberos ticket. * Prepare, review, and advance standards-track and informational specifications defining use of new cryptographic algorithms in the Kerberos protocol, on an ongoing basis. * Prepare, review, and advance standards-track and informational specifications defining use of new cryptographic algorithms in Kerberos using the RFC3961 framework. Cryptographic algorithms intended for standards track status must be of good quality, have broad international support, and fill a definite need. * Prepare, review, and advance standards-track and informational specifications defining new authorization data types for carrying supplemental information about the client to which a Kerberos ticket has been issued and/or restrictions on what the ticket can be used for. To enhance this ongoing authorization data work, a container format supporting the use cases of draft-sorce-krbwg-general-pac-01 may be standardized. * Prepare a standards-track protocol to solve the use cases addressed by draft-hotz-kx509-01 including new support for digital signatures. * Prepare and advance one or more standards-track specifications which define mechanisms for establishing keys and configuration information used during authentication between Kerberos realms. * Prepare and advance a standards-track specification defining a format for the transport of Kerberos credentials within other protocols. * Today Kerberos requires a replay cache to be used in AP exchanges in almost all cases. Replay caches are quite complex to implement correctly, particularly in clustered systems. High-performance replay caches are even more difficult to implement. The WG will pursue extensions to minimize the need for replay caching, optimize replay caching, and/or elide the need for replay caching. * Produce an LDAP schema for management of the KDC's database. 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 Done WGLC on IAKERB Done Anonymity back to IESG Done WGLC on STARTTLS Done WGLC on DHCPv6 Option Done draft-ietf-krb-wg-clear-text-cred to IESG Aug 2011 draft-ietf-krbwg-camellia-cts to IESG Aug 2011 draft-ietf-krb-wg-des-die-die-die to IESG Sep 2011 DHCP option for Kerberos to IESG Oct 2011 Internationalized error support to IESG Oct 2011 draft-ietf-krb-wg-pkinit-alg-agility to IESG Dec 2011 Kerberos PAD authorization data to IESG Dec 2011 Consider adopting kx509bis in response to use cases in draft-hotz-kx509-01 Internet-Drafts: Posted Revised I-D Title ------ ------- -------------------------------------------- Mar 2001 Mar 2011 Kerberos Principal Name Canonicalization and KDC-Generated Cross-Realm Referrals Nov 2006 May 2011 Kerberos Version 5 GSS-API Channel Binding Hash Agility Oct 2007 Jul 2011 OTP Pre-authentication Dec 2007 May 2011 An information model for Kerberos version 5 Feb 2008 Jul 2011 Kerberos Options for DHCPv6 Jun 2011 Jul 2011 The Unencrypted Form Of Kerberos 5 KRB-CRED Message Request For Comments: RFC Stat Published Title ------- -- ----------- ------------------------------------ RFC3962Standard Feb 2005 AES Encryption for Kerberos 5 RFC3961Standard Feb 2005 Encryption and Checksum Specifications for Kerberos 5 RFC4120Standard Jul 2005 The Kerberos Network Authentication Service (V5) RFC4121Standard Jul 2005 The Kerberos Version 5 Generic Security Service Application Program Interface (GSS-API) Mechanism: Version 2 RFC4537 PS Jun 2006 Kerberos Cryptosystem Negotiation Extension RFC4557 PS Jun 2006 Online Certificate Status Protocol (OCSP) Support for Public Key Cryptography for Initial Authentication in Kerberos (PKINIT) RFC4556 PS Jun 2006 Public Key Cryptography for Initial Authentication in Kerberos (PKINIT) RFC5021 PS Aug 2007 Extended Kerberos Version 5 Key Distribution Center (KDC) Exchanges Over TCP RFC5349 I Sep 2008 Elliptic Curve Cryptography (ECC) Support for Public Key Cryptography for Initial Authentication in Kerberos (PKINIT) RFC5868 I May 2010 Problem Statement on the Cross-Realm Operation of Kerberos RFC6111 PS Apr 2011 Additional Kerberos Naming Constraints RFC6112 PS Apr 2011 Anonymity Support for Kerberos RFC6113 PS Apr 2011 A Generalized Framework for Kerberos Pre-Authentication RFC6251 I May 2011 Using Kerberos Version 5 over the Transport Layer Security (TLS) Protocol