GSAKMP: Group Secure Association Key Management Protocol
RFC 4535
Network Working Group H. Harney
Request for Comments: 4535 U. Meth
Category: Standards Track A. Colegrove
SPARTA, Inc.
G. Gross
IdentAware
June 2006
GSAKMP: Group Secure Association Key Management Protocol
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.
Copyright Notice
Copyright (C) The Internet Society (2006).
Abstract
This document specifies the Group Secure Association Key Management
Protocol (GSAKMP). The GSAKMP provides a security framework for
creating and managing cryptographic groups on a network. It provides
mechanisms to disseminate group policy and authenticate users, rules
to perform access control decisions during group establishment and
recovery, capabilities to recover from the compromise of group
members, delegation of group security functions, and capabilities to
destroy the group. It also generates group keys.
Harney, et al. Standards Track [Page 1]
RFC 4535 GSAKMP June 2006
Table of Contents
1. Introduction ....................................................7
1.1. GSAKMP Overview ............................................7
1.2. Document Organization ......................................9
2. Terminology .....................................................9
3. Security Considerations ........................................12
3.1. Security Assumptions ......................................12
3.2. Related Protocols .........................................13
3.2.1. ISAKMP .............................................13
3.2.2. FIPS Pub 196 .......................................13
3.2.3. LKH ................................................13
3.2.4. Diffie-Hellman .....................................14
3.3. Denial of Service (DoS) Attack ............................14
3.4. Rekey Availability ........................................14
3.5. Proof of Trust Hierarchy ..................................15
4. Architecture ...................................................15
4.1. Trust Model ...............................................15
4.1.1. Components .........................................15
4.1.2. GO .................................................16
4.1.3. GC/KS ..............................................16
4.1.4. Subordinate GC/KS ..................................17
4.1.5. GM .................................................17
4.1.6. Assumptions ........................................18
4.2. Rule-Based Security Policy ................................18
4.2.1. Access Control .....................................19
4.2.2. Authorizations for Security-Relevant Actions .......20
4.3. Distributed Operation .....................................20
4.4. Concept of Operation ......................................22
4.4.1. Assumptions ........................................22
4.4.2. Creation of a Policy Token .........................22
4.4.3. Creation of a Group ................................23
4.4.4. Discovery of GC/KS .................................24
4.4.5. GC/KS Registration Policy Enforcement ..............24
4.4.6. GM Registration Policy Enforcement .................24
4.4.7. Autonomous Distributed GSAKMP Operations ...........24
5. Group Life Cycle ...............................................27
5.1. Group Definition ..........................................27
5.2. Group Establishment .......................................27
5.2.1. Standard Group Establishment .......................28
5.2.1.1. Request to Join ...........................30
5.2.1.2. Key Download ..............................31
5.2.1.3. Request to Join Error .....................33
5.2.1.4. Key Download - Ack/Failure ................34
5.2.1.5. Lack of Ack ...............................35
5.2.2. Cookies: Group Establishment with Denial of
Service Protection .................................36
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