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heimdal/doc/standardisation/draft-ietf-kitten-gssapi-domain-based-names-01.txt
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NETWORK WORKING GROUP N. Williams
Internet-Draft Sun
Expires: April 19, 2006 October 16, 2005
GSS-API Domain-Based Service Names and Name Type
draft-ietf-kitten-gssapi-domain-based-names-01.txt
Status of this Memo
By submitting this Internet-Draft, each author represents that any
applicable patent or other IPR claims of which he or she is aware
have been or will be disclosed, and any of which he or she becomes
aware will be disclosed, in accordance with Section 6 of BCP 79.
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 April 19, 2006.
Copyright Notice
Copyright (C) The Internet Society (2005).
Abstract
This document describes domainname-based service principal names and
the corresponding name type for the Generic Security Service
Application Programming Interface (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
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clients to authorize the service's servers based on authentication of
their names.
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. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
7.1. Normative . . . . . . . . . . . . . . . . . . . . . . . . . 9
7.2. Informative . . . . . . . . . . . . . . . . . . . . . . . . 9
Author's Address . . . . . . . . . . . . . . . . . . . . . . 10
Intellectual Property and Copyright Statements . . . . . . . 11
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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].
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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 [RFC3377] with SASL [RFC2222] and the Kerberos V
mechanism [RFC1964] for the GSS-API [RFC2743] 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
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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".
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4. Query and Display Syntaxes
There is a single name syntax for domain-based names.
The syntax is:
domain-based-name :=
| <service> '@' <domain> '@' <hostname>
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.
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5. Examples
o ldap@example.tld@ds1.example.tld
o kadmin@example.tld@kdc1.example.tld
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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.
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7. References
7.1. 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.
7.2. Informative
[RFC1964] Linn, J., "The Kerberos Version 5 GSS-API Mechanism",
RFC 1964, June 1996.
[RFC2222] Myers, J., "Simple Authentication and Security Layer
(SASL)", RFC 2222, October 1997.
[RFC3377] Hodges, J. and R. Morgan, "Lightweight Directory Access
Protocol (v3): Technical Specification", RFC 3377,
September 2002.
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Author's Address
Nicolas Williams
Sun Microsystems
5300 Riata Trace Ct
Austin, TX 78727
US
Email: Nicolas.Williams@sun.com
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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
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attempt made to obtain a general license or permission for the use of
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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
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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 (2005). 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 April 19, 2006 [Page 11]
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