Love Hörnquist Åstrand
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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@14484 ec53bebd-3082-4978-b11e-865c3cabbd6b
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506 lines
10 KiB
Plaintext
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NETWORK WORKING GROUP N. Williams
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Internet-Draft Sun
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Expires: December 30, 2004 July 2004
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A PRF API extension for the GSS-API
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draft-ietf-kitten-gssapi-prf-01.txt
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Status of this Memo
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By submitting this Internet-Draft, I certify that any applicable
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patent or other IPR claims of which I am aware have been disclosed,
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and any of which I become aware will be disclosed, in accordance with
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RFC 3668.
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Internet-Drafts are working documents of the Internet Engineering
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Task Force (IETF), its areas, and its working groups. Note that
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other groups may also distribute working documents as
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Internet-Drafts.
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Internet-Drafts are draft documents valid for a maximum of six months
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and may be updated, replaced, or obsoleted by other documents at any
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time. It is inappropriate to use Internet-Drafts as reference
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material or to cite them other than as "work in progress."
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The list of current Internet-Drafts can be accessed at
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http://www.ietf.org/ietf/1id-abstracts.txt.
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The list of Internet-Draft Shadow Directories can be accessed at
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http://www.ietf.org/shadow.html.
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This Internet-Draft will expire on December 30, 2004.
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Copyright Notice
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Copyright (C) The Internet Society (2004). All Rights Reserved.
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Abstract
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This document defines a Pseudo-Random Function (PRF) extension to the
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Generic Security Service Applicatoin Programming Interface (GSS-API)
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for keying application protocols given an established GSS-API
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security context. The primary intended use of this function is to
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key secure session layers that don't or cannot use GSS-API
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per-message MIC (message integrity check) and wrap tokens for session
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protection.
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Williams Expires December 30, 2004 [Page 1]
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Internet-Draft A PRF Extension for the GSS-API July 2004
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Table of Contents
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1. Conventions used in this document . . . . . . . . . . . . . . 3
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2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
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3. GSS_Pseudo_random() . . . . . . . . . . . . . . . . . . . . . 5
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3.1 C-Bindings . . . . . . . . . . . . . . . . . . . . . . . . . . 5
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4. Security Considerations . . . . . . . . . . . . . . . . . . . 7
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5. References . . . . . . . . . . . . . . . . . . . . . . . . . . 8
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5.1 Normative References . . . . . . . . . . . . . . . . . . . . . 8
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5.2 Informative References . . . . . . . . . . . . . . . . . . . . 8
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Author's Address . . . . . . . . . . . . . . . . . . . . . . . 8
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Intellectual Property and Copyright Statements . . . . . . . . 9
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Williams Expires December 30, 2004 [Page 2]
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Internet-Draft A PRF Extension for the GSS-API July 2004
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1. Conventions used in this document
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The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
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document are to be interpreted as described in [RFC2119].
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Williams Expires December 30, 2004 [Page 3]
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Internet-Draft A PRF Extension for the GSS-API July 2004
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2. Introduction
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A need has arisen for users of the GSS-API to key applications'
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cryptographic protocols using established GSS-API security contexts.
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Such applications can use the GSS-API for authentication, but not for
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transport security (for whatever reasons), and since the GSS-API does
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not provide a method for obtaining keying material from established
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security contexts such applications cannot make effective use of the
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GSS-API.
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To address this need we define a pseudo-random function (PRF)
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extension to the GSS-API.
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Williams Expires December 30, 2004 [Page 4]
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Internet-Draft A PRF Extension for the GSS-API July 2004
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3. GSS_Pseudo_random()
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Inputs:
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o context CONTEXT handle,
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o prf_in OCTET STRING,
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o desired_output_len INTEGER
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Outputs:
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o major_status INTEGER,
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o minor_status INTEGER,
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o prf_out OCTET STRING
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Return major_status codes:
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o GSS_S_COMPLETE indicates no error.
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o GSS_S_NO_CONTEXT indicates that a null context has been provided
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as input.
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o GSS_S_CONTEXT_EXPIRED indicates that an expired context has been
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provided as input.
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o GSS_S_UNAVAILABLE indicates that the mechanism lacks support for
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this function.
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o GSS_S_FAILURE indicates failure or lack of support; the minor
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status code may provide additional information.
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This function applies the established context's mechanism's keyed PRF
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function to the input data (prf_in), keyed with key material
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associated with the given security context and outputs the resulting
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octet string (prf_out) of desired_output_len length.
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The output string of this function MUST be a pseudo-random function
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[GGM1][GGM2] of the input keyed with key material from the
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established security context -- the chances of getting the same
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output given different input parameters should be exponentially
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small.
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This function, applied to the same inputs by an initiator and
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acceptor using the same established context, MUST produce the *same
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results* for both, the initiator and acceptor, even if called
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multiple times for the same context.
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Mechanisms MAY limit the output of the PRF according, possibly in
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ways related to the types of cryptographic keys available for the PRF
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function, thus the prf_out output of GSS_Pseudo_random() MAY be
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smaller than requested.
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3.1 C-Bindings
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Williams Expires December 30, 2004 [Page 5]
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OM_uint32 gss_pseudo_random(
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OM_uint32 *minor_status,
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gss_ctx_id_t context,
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const gss_buffer_t prf_in,
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ssize_t desired_output_len,
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gss_buffer_t prf_out
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);
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Williams Expires December 30, 2004 [Page 6]
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4. Security Considerations
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Care should be taken in properly designing a mechanism's PRF
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function.
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GSS mechanisms' PRF functions should use a key derived from contexts'
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session keys and should preserve the forward security properties of
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the mechanisms' key exchanges.
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Williams Expires December 30, 2004 [Page 7]
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5. References
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5.1 Normative References
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[GGM1] Goldreich, O., Goldwasser, S. and S. Micali, "How to
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Construct Random Functions", October 1986.
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[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
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Requirement Levels", BCP 14, RFC 2119, March 1997.
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[RFC2743] Linn, J., "Generic Security Service Application Program
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Interface Version 2, Update 1", RFC 2743, January 2000.
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[RFC2744] Wray, J., "Generic Security Service API Version 2 :
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C-bindings", RFC 2744, January 2000.
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5.2 Informative References
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[GGM2] Goldreich, O., Goldwasser, S. and S. Micali, "On the
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Cryptographic Applications of Random Functions", 1985.
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[RFC1750] Eastlake, D., Crocker, S. and J. Schiller, "Randomness
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Recommendations for Security", RFC 1750, December 1994.
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Author's Address
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Nicolas Williams
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Sun Microsystems
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5300 Riata Trace Ct
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Austin, TX 78727
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US
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EMail: Nicolas.Williams@sun.com
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Williams Expires December 30, 2004 [Page 8]
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Internet-Draft A PRF Extension for the GSS-API July 2004
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Intellectual Property Statement
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The IETF takes no position regarding the validity or scope of any
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Intellectual Property Rights or other rights that might be claimed to
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pertain to the implementation or use of the technology described in
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this document or the extent to which any license under such rights
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might or might not be available; nor does it represent that it has
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made any independent effort to identify any such rights. Information
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on the procedures with respect to rights in RFC documents can be
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found in BCP 78 and BCP 79.
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Copies of IPR disclosures made to the IETF Secretariat and any
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assurances of licenses to be made available, or the result of an
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attempt made to obtain a general license or permission for the use of
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such proprietary rights by implementers or users of this
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specification can be obtained from the IETF on-line IPR repository at
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http://www.ietf.org/ipr.
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The IETF invites any interested party to bring to its attention any
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copyrights, patents or patent applications, or other proprietary
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rights that may cover technology that may be required to implement
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this standard. Please address the information to the IETF at
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ietf-ipr@ietf.org.
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Disclaimer of Validity
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This document and the information contained herein are provided on an
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"AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
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OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
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ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
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INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
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INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
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WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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Copyright Statement
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Copyright (C) The Internet Society (2004). This document is subject
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to the rights, licenses and restrictions contained in BCP 78, and
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except as set forth therein, the authors retain all their rights.
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Acknowledgment
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Funding for the RFC Editor function is currently provided by the
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Internet Society.
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Williams Expires December 30, 2004 [Page 9]
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