heimdal/doc/standardisation/draft-williams-gssapi-domain-based-names-00.txt

NETWORK WORKING GROUP                                        N. Williams
Internet-Draft                                                       Sun
Expires: December 30, 2004                                     July 2004



            GSS-API Domain-Based Service Names and Name Type
            draft-williams-gssapi-domain-based-names-00.txt


Status of this Memo


   By submitting this Internet-Draft, I certify that any applicable
   patent or other IPR claims of which I am aware have been disclosed,
   and any of which I become aware will be disclosed, in accordance with
   RFC 3668.


   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as
   Internet-Drafts.


   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."


   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt.


   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.


   This Internet-Draft will expire on December 30, 2004.


Copyright Notice


   Copyright (C) The Internet Society (2004).  All Rights Reserved.


Abstract


   This document describes domainname-based service principal names and
   the corresponding name type for the GSS-API.


   Domain-based service names are similar to host-based service names,
   but using a domain name (not necessarily and Internat domain name)
   instead of or in addition to a hostname.  The primary purpose of
   domain-based service names is to provide a way to name clustered
   services after the domain which they service, thereby allowing their
   clients to authorize the service's servers based on authentication of
   their names.




Williams               Expires December 30, 2004                [Page 1]
Internet-Draft           GSS Domain Based Names                July 2004



Table of Contents


   1. Conventions used in this document  . . . . . . . . . . . . . . . 3
   2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 4
   3. Name Type OID and Symbolic Name  . . . . . . . . . . . . . . . . 5
   4. Query and Display Syntaxes . . . . . . . . . . . . . . . . . . . 6
   5. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
   6. Security Considerations  . . . . . . . . . . . . . . . . . . . . 8
   7. Normative  . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
      Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 8
      Intellectual Property and Copyright Statements . . . . . . . . . 9









































Williams               Expires December 30, 2004                [Page 2]
Internet-Draft           GSS Domain Based Names                July 2004



1.  Conventions used in this document


   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].















































Williams               Expires December 30, 2004                [Page 3]
Internet-Draft           GSS Domain Based Names                July 2004



2.  Introduction


   The use of hostbased principal names for domain-wide services
   presents the problem of how to distinguish between an instance of a
   hostbased service that is authorized to respond for a domain and one
   that isn't.


   Consider LDAP.  LDAP with SASL and the Kerberos V GSS-API mechanism
   uses a hostbased principal with a service name of "ldap", a
   reasonable approach, provided there is only one logical LDAP
   directory in a Kerberos realm's domain, and that all ldap servers in
   that realm serve that one LDAP directory.  If there were other LDAP
   directories, then clients could not tell which service is authorized
   to serve which directory, not without assuming a secure method for
   finding LDAP servers (e.g., DNSSEC).  This is a significant, and
   oft-unstated restriction on users of LDAP.


   Domain based names can eliminate this problem by allowing LDAP
   service names to indicate which LDAP directory they are authorized to
   serve.


   A domain-based name consists of three required elements:
   o  a service name
   o  a domain name
   o  a hostname



























Williams               Expires December 30, 2004                [Page 4]
Internet-Draft           GSS Domain Based Names                July 2004



3.  Name Type OID and Symbolic Name


   The new name type has an OID of
      [NOTE:  OID assignment to be made with IANA.]


      {iso(1) org(3) dod(6) internet(1) security(5) nametypes(6)
      gss-domain-based(5)}


   The recommended symbolic name for this GSS-API name type is
   "GSS_C_NT_DOMAINBASED_SERVICE".










































Williams               Expires December 30, 2004                [Page 5]
Internet-Draft           GSS Domain Based Names                July 2004



4.  Query and Display Syntaxes


   There is a single syntax that applies to both query and display forms
   of domain-based names.  (We ignore string profile matters here as the
   GSS-API's, and its mechanisms' use of character strings are out of
   scope for this document.)


   The syntax is:
      domain-based-name :=
         | <service> '@' <domain> '@' <hostname>
         | <service> '@@' <hostname>


   The domain name element is only optional in the query syntax of
   domain-based names.


   A missing domain name is always to be added by the GSS-API mechanisms
   during name canonicalization, using whatever default values are
   appropriate for the mechanisms.


   Therefore the display form of domain-based MNs (see [RFC2743]) MUST
   include all three elements of domain-based names.


   Note that for Internet domain names the trailing '.' is not and MUST
   NOT be included in the domain name (or hostname) parts of the display
   form GSS-API domain-based MNs.



























Williams               Expires December 30, 2004                [Page 6]
Internet-Draft           GSS Domain Based Names                July 2004



5.  Examples


   o  ldap@@ds1.example.tld
   o  ldap@example.tld@ds1.example.tld


   o  kadmin@@kdc1.example.tld
   o  kadmin@example.tld@kdc1.example.tld













































Williams               Expires December 30, 2004                [Page 7]
Internet-Draft           GSS Domain Based Names                July 2004



6.  Security Considerations


   Use of GSS-API domain-based names may not be negotiable by some
   GSS-API mechanisms, and some acceptors may not support GSS-API
   domain-based names.  In such cases initiators are left to fallback on
   the use of hostbased names, in which case the initiators MUST also
   verify that the acceptor's hostbased name is authorized to provide
   the given service for the domain that the initiator had wanted.


   The above security consideration also applies to all GSS-API
   initiators who lack support for domain-based service names.


7  Normative


   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.


   [RFC2743]  Linn, J., "Generic Security Service Application Program
              Interface Version 2, Update 1", RFC 2743, January 2000.


   [RFC2744]  Wray, J., "Generic Security Service API Version 2 :
              C-bindings", RFC 2744, January 2000.



Author's Address


   Nicolas Williams
   Sun Microsystems
   5300 Riata Trace Ct
   Austin, TX  78727
   US


   EMail: Nicolas.Williams@sun.com



















Williams               Expires December 30, 2004                [Page 8]
Internet-Draft           GSS Domain Based Names                July 2004



Intellectual Property Statement


   The IETF takes no position regarding the validity or scope of any
   Intellectual Property Rights or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; nor does it represent that it has
   made any independent effort to identify any such rights.  Information
   on the procedures with respect to rights in RFC documents can be
   found in BCP 78 and BCP 79.


   Copies of IPR disclosures made to the IETF Secretariat and any
   assurances of licenses to be made available, or the result of an
   attempt made to obtain a general license or permission for the use of
   such proprietary rights by implementers or users of this
   specification can be obtained from the IETF on-line IPR repository at
   http://www.ietf.org/ipr.


   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights that may cover technology that may be required to implement
   this standard.  Please address the information to the IETF at
   ietf-ipr@ietf.org.



Disclaimer of Validity


   This document and the information contained herein are provided on an
   "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
   OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
   ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
   INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
   INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
   WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.



Copyright Statement


   Copyright (C) The Internet Society (2004).  This document is subject
   to the rights, licenses and restrictions contained in BCP 78, and
   except as set forth therein, the authors retain all their rights.



Acknowledgment


   Funding for the RFC Editor function is currently provided by the
   Internet Society.




Williams               Expires December 30, 2004                [Page 9]