NETWORK WORKING GROUP N. Williams
Internet-Draft Sun
Expires: December 28, 2006 June 26, 2006
GSS-API Domain-Based Service Names and Name Type
draft-ietf-kitten-gssapi-domain-based-names-02.txt
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Copyright (C) The Internet Society (2006).
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 an Internet 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. An network might have multiple, distinct LDAP
services, but only one LDAP "name service"; if so then clients could
not tell which LDAP service principals are 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: the use of domain-
based names should imply that the given host is a server for the
official LDAP name service of the given domain.
Notwithstanding the LDAP example the use of domain-based principal
names for LDAP is not actually specified here and will be specified
in a separate document.
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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