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Versions: 00 01 02 03 04 05 RFC 5179
NETWORK WORKING GROUP N. Williams
Internet-Draft Sun
Expires: July 27, 2008 January 24, 2008
GSS-API Domain-Based Service Names Mapping for the Kerberos V GSS
Mechanism
draft-ietf-kitten-krb5-gssapi-domain-based-names-05.txt
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Copyright Notice
Copyright (C) The IETF Trust (2008).
Abstract
This document describes the mapping of GSS-API domainname-based
service principal names onto Kerberos V principal names.
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Table of Contents
1. Conventions used in this document . . . . . . . . . . . . . . . 3
2. Domain-Based Names for the Kerberos V GSS-API Mechanism . . . . 3
3. Internationalization considerations . . . . . . . . . . . . . . 3
4. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
5. Security Considerations . . . . . . . . . . . . . . . . . . . . 4
6. Normative References . . . . . . . . . . . . . . . . . . . . . 4
Author's Address . . . . . . . . . . . . . . . . . . . . . . . 5
Intellectual Property and Copyright Statements . . . . . . . . 6
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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].
2. Domain-Based Names for the Kerberos V GSS-API Mechanism
In accordance with [I-D.ietf-kitten-gssapi-domain-based-names] this
document provides the mechanism-specific details needed to implement
GSS-API [RFC2743] domain-based service names with the Kerberos V GSS-
API mechanism [RFC4121].
GSS_C_NT_DOMAINBASED_SERVICE name SHOULD be mapped to Kerberos V
principal names as follows:
o the <service> name becomes the first (0th) component of the
Kerberos V principal name;
o the <hostname> becomes the second component of the Kerberos V
principal name;
o the <domain> name becomes the third component of the Kerberos V
principal name;
o the realm of the resulting principal name is that which
corresponds to the domain name, treated as a hostname.
The same name canonicalization considerations and methods as used
elsewhere in the Kerberos V GSS-API mechanism [RFC4121] and Kerberos
V [RFC4120] in general apply here.
Implementations SHOULD use a Kerberos V name-type of NT-SRV-HST-
DOMAIN (integral value to be assigned, possibly after WGLC?) but MAY
use NT-UNKNOWN instead.
3. Internationalization considerations
It is unclear, at this time, how best to address internationalization
of Kerberos V domain-based principal names. This is because the
Kerberos V core protocol internationalization project is incomplete.
However, clearly the best way to interoperate when using Kerberos V
domain-based principal names is to use ACE-encoded internationalized
domain names [RFC3490] for the hostname and domain name slots of a
Kerberos V domain-based principal name. Therefore Kerberos V GSS-API
mechanism implementations MUST do just that.
4. Examples
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o The domain based name, of generic form,
"ldap@foo.example@ds1.foo.example" may map to a Kerberos V
principal name like: "ldap/ds1.foo.example/
foo.example@FOO.EXAMPLE"
o The domain based name, of generic form,
"kadmin@foo.example@kdc1.foo.example" may map to a Kerberos V
principal name like: "kadmin/kdc1.foo.example/
foo.example@FOO.EXAMPLE"
5. Security Considerations
See [I-D.ietf-kitten-gssapi-domain-based-names].
It is important for the security of protocols using the Kerberos V
GSS-API mechanism and domain-based names, that the realm of domain-
based principal names be derived from the hostname, rather than the
domain name slots of the input domain-based name string.
6. Normative References
[I-D.ietf-kitten-gssapi-domain-based-names]
Williams, N. and A. Melnikov, "GSS-API
Internationalization and Domain-Based Service Names and
Name Type", draft-ietf-kitten-gssapi-domain-based-names-05
(work in progress), December 2007.
[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.
[RFC3490] Faltstrom, P., Hoffman, P., and A. Costello,
"Internationalizing Domain Names in Applications (IDNA)",
RFC 3490, March 2003.
[RFC4120] Neuman, C., Yu, T., Hartman, S., and K. Raeburn, "The
Kerberos Network Authentication Service (V5)", RFC 4120,
July 2005.
[RFC4121] Zhu, L., Jaganathan, K., and S. Hartman, "The Kerberos
Version 5 Generic Security Service Application Program
Interface (GSS-API) Mechanism: Version 2", RFC 4121,
July 2005.
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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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