OCTET STRING per_msg_token = Signature field from TSIG RR
included in the server’s query response
Since the OUTPUTS parameter major_status = GSS_S_COMPLETE, the
signature is validated, security negotiation is complete and the
security context state is advanced to Context Established. These
client and server will use the established security context to sign
and validate the signatures when they exchange packets with each
other until the context expires.
7. Security Considerations
This document describes a protocol for DNS security using GSS-API.
The security provided by this protocol is only as effective as the
security provided by the underlying GSS mechanisms.
All the security considerations from RFC 2845, RFC 2930 and RFC 2743
apply to the protocol described in this document.
8. IANA Considerations
The IANA has reserved the TSIG Algorithm name gss-tsig for the use in
the Algorithm fields of TKEY and TSIG resource records. This
Algorithm name refers to the algorithm described in this document.
The requirement to have this name registered with IANA is specified
in RFC 2845.
9. Conformance
The GSS API using SPNEGO [RFC2478] provides maximum flexibility to
choose the underlying security mechanisms that enables security
context negotiation. GSS API using SPNEGO [RFC2478] enables client
and server to negotiate and choose such underlying security
mechanisms on the fly. To support such flexibility, DNS clients and
servers SHOULD specify SPNEGO mech_type in their GSS API calls. At
the same time, in order to guarantee interoperability between DNS
clients and servers that support GSS-TSIG it is required that
- DNS servers specify SPNEGO mech_type
- GSS APIs called by DNS client support Kerberos v5
- GSS APIs called by DNS server support SPNEGO [RFC2478] and
Kerberos v5.
In addition to these, GSS APIs used by DNS client and server MAY also
support other underlying security mechanisms.
10. Intellectual Property Statement
The IETF takes no position regarding the validity or scope of any
intellectual property 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; neither does it represent that it
has made any effort to identify any such rights. Information on the
IETF’s procedures with respect to rights in standards-track and
standards-related documentation can be found in BCP-11. Copies of
claims of rights made available for publication 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 implementors or users of this specification can
be obtained from the IETF Secretariat.
The IETF invites any interested party to bring to its attention any
copyrights, patents or patent applications, or other proprietary
rights which may cover technology that may be required to practice
this standard. Please address the information to the IETF Executive
Director.
11. Acknowledgements
The authors of this document would like to thank the following people
for their contribution to this specification: Chuck Chan, Mike
Swift, Ram Viswanathan, Olafur Gudmundsson, Donald E. Eastlake, 3rd
and Erik Nordmark.
12. References
12.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2478] Baize, E. and D. Pinkas, "The Simple and Protected GSS-API
Negotiation Mechanism", RFC 2478, December 1998.
[RFC2743] Linn, J., "Generic Security Service Application Program
Interface, Version 2 , Update 1", RFC 2743, January 2000.
[RFC2845] Vixie, P., Gudmundsson, O., Eastlake 3rd, D. and B.
Wellington, "Secret Key Transaction Authentication for DNS
(TSIG)", RFC 2845, May 2000.
[RFC2930] Eastlake 3rd, D., "Secret Key Establishment for DNS (TKEY
RR)", RFC 2930, September 2000.
12.2. Informative References
[ISO11578] "Information technology", "Open Systems Interconnection",
"Remote Procedure Call", ISO/IEC 11578:1996,
http://www.iso.ch/cate/d2229.html.
[RFC1034] Mockapetris, P., "Domain Names - Concepts and Facilities",
STD 13, RFC 1034, November 1987.
[RFC1035] Mockapetris, P., "Domain Names - Implementation and
Specification", STD 13, RFC 1034, November 1987.
[RFC1964] Linn, J., "The Kerberos Version 5 GSS-API Mechanism", RFC
1964, June 1996.
[RFC2025] Adams, C., "The Simple Public-Key GSS-API Mechanism
(SPKM)", RFC 2025, October 1996.
[RFC2137] Eastlake 3rd, D., "Secure Domain Name System Dynamic
Update", RFC 2137, April 1997.
[RFC2535] Eastlake 3rd, D., "Domain Name System Security Extensions",
RFC 2535, March 1999.
13. Authors’ Addresses
Stuart Kwan
Microsoft Corporation
One Microsoft Way
Redmond, WA 98052
USA
EMail: skwan@microsoft.com
Praerit Garg
Microsoft Corporation
One Microsoft Way
Redmond, WA 98052
USA
EMail: praeritg@microsoft.com
James Gilroy
Microsoft Corporation
One Microsoft Way
Redmond, WA 98052
USA
EMail: jamesg@microsoft.com
Levon Esibov
Microsoft Corporation
One Microsoft Way
Redmond, WA 98052
USA
EMail: levone@microsoft.com
Randy Hall
Lucent Technologies
400 Lapp Road
Malvern PA 19355
USA
EMail: randyhall@lucent.com
Jeff Westhead
Microsoft Corporation
One Microsoft Way
Redmond, WA 98052
USA
EMail: jwesth@microsoft.com
14. Full Copyright Statement
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