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- CURRENT_MEETING_REPORT_
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- Reported by John Linn/DEC
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- CAT BOF Minutes
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- A Birds of a Feather session met on Common Authentication Technology
- (CAT) at the March meeting; the first formal CAT Working Group meeting
- will take place at the July IETF. At the March BOF, Jeff Schiller and
- John Linn presented material on CAT concepts and responded to questions
- from attendees.
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- CAT's goal is to provide security services to a range of IETF protocol
- callers in a manner which insulates those callers from the specifics of
- underlying cryptographic security mechanisms, enabling modular
- separation between protocol and security implementation activities.
- Agreement on common security service interface characteristics, token
- representations, and other protocol integration issues, as well as
- discussion of individual mechanisms, falls within this Working Group's
- Charter. Two IETF applications protocol Working Groups (Telnet and
- Network Printing) are currently seeking to employ CAT-related
- techniques.
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- There was some controversy about mechanism type negotiation as
- contemplated by the Telnet security proposals. One observation: It's
- necessary to intersect two peers' notions of acceptable mechanisms, not
- for a client to accept any (however weak) which may be offered by a
- server. A belief was voiced that few servers would support more than a
- single mechanism, and/but that clients would often have to support
- multiple mechanisms to conform with their desired set of target servers;
- cases of single-mechanism clients communicating with multi-mechanism
- servers are also possible. While it was widely agreed that the world
- would be a better and more interoperable place if and when only one
- mechanism was in general use, there was a sense that ambidextrous hosts
- were unavoidable and would have to be accommodated. The Assigned
- Numbers RFC was proposed as a ``registry'' vehicle for mechanism type
- specifiers to be used in the Internet.
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- Interest was expressed in means to allow protection of data carried in
- stream-oriented protocols as well as in message-oriented protocols,
- whether by definition of stream-oriented security services interfaces or
- by (direct or mediated) provision of session keys to callers. There was
- debate about the merits of modeling protected password exchanges as CAT
- authentication mechanisms. In subsequent Security Area Advisory Group
- (SAAG) discussion, it was agreed that mechanisms performing key
- exchange, and hence constituting a basis for confidentiality and
- integrity protection for messages as well as authentication, should be
- emphasized.
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- The CAT activity will be supported with a family of documents, to be
- provided from different sources. A high-level Generic Security Service
- Application Program Interface (GSSAPI) specification will be submitted
- to the Internet-Draft process in advance of the July IETF meeting, and
- will be followed by a separate document defining a set of C language
- bindings therefore. Organizations defining particular security
- mechanisms (e.g., SPX, Kerberos) will submit separate mechanism-specific
- documents, supporting independently developed yet interoperable
- implementations of those mechanisms. CAT participants will pursue
- design refinements, protocol integration, and implementation activities,
- and will continue consulting liaison activities with IETF protocol
- Working Groups which are prospective clients for CAT-provided security
- services.
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- Attendees
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- Warren Benson wbenson@zeus.unomaha.edu
- Randy Butler rbutler@ncsa.uiuc.edu
- Vinton Cerf vcerf@NRI.Reston.VA.US
- Martina Chan mchan@mot.com
- Stephen Crocker crocker@tis.com
- Jeffrey Edelheit edelheit@smiley.mitre.org
- Barbara Fraser byf@cert.sei.cmu.edu
- Shawn Gallagher gallagher@quiver.enet.dec.com
- James Galvin galvin@tis.com
- Tom Grant grant@xylogics.com
- Neil Haller nmh@bellcore.com
- Russ Hobby rdhobby@ucdavis.edu
- Joel Jacobs jdj@mitre.org
- Ajay Kachrani kachrani@regent.enet.dec.com
- Philip Karn karn@thumper.bellcore.com
- John Linn ULTRA::LINN
- Mike Little little@ctt.bellcore.com
- Stephanie Price price@cmc.com
- Michael Reilly reilly@pa.dec.com
- George Sanderson sanderson@mdc.com
- Tim Seaver tas@mcnc.org
- Sam Sjogren sjogren@tgv.com
- Michael St. Johns stjohns@umd5.umd.edu
- William Townsend townsend@xylogics.com
- Glenn Trewitt trewitt@pa.dec.com
- Daniel Weidman weidman@wudos2.wustl.edu
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