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.
* 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.