RFC5179
Network Working Group N. Williams Request for Comments: 5179 Sun Category: Standards Track May 2008
Generic Security Service Application Program Interface (GSS-API) Domain-Based Service Names Mapping for the Kerberos V GSS Mechanism
Status of This Memo
This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.
Abstract
This document describes the mapping of Generic Security Service Application Program Interface (GSS-API) domain-name-based service principal names onto Kerberos V principal names.
Contents
Domain-Based Names for the Kerberos V GSS-API Mechanism
In accordance with RFC5178, 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 NTT-SRVT-HST-DOMAIN (which has the value 12) but MAY use NT-UNKNOWN instead.
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.
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.
Examples
o The domain-based name, of generic form,
"[email protected]@ds1.foo.example" may map to a Kerberos V principal name like: "ldap/ds1.foo.example/ [email protected]"
o The domain-based name, of generic form,
"[email protected]@kdc1.foo.example" may map to a Kerberos V principal name like: "kadmin/kdc1.foo.example/ [email protected]"
Security Considerations
See RFC5178.
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.
Normative References
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.
RFC5178 Williams, N. and A. Melnikov, "Generic Security Service
Application Program Interface (GSS-API)
Internationalization and Domain-Based Service Names and
Name Type", RFC 5178, May 2008.
Author's Address
Nicolas Williams Sun Microsystems 5300 Riata Trace Ct. Austin, TX 78727 US
EMail: [email protected]
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