Transport Security Model for the Simple Network Management Protocol (SNMP)
RFC 5591

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Network Working Group                                      D. Harrington
Request for Comments: 5591                     Huawei Technologies (USA)
Category: Standards Track                                    W. Hardaker
                                               Cobham Analytic Solutions
                                                               June 2009

                    Transport Security Model for the
               Simple Network Management Protocol (SNMP)

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.

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Harrington & Hardaker       Standards Track                     [Page 1]
RFC 5591           Transport Security Model for SNMP           June 2009

Abstract

   This memo describes a Transport Security Model for the Simple Network
   Management Protocol (SNMP).

   This memo also defines a portion of the Management Information Base
   (MIB) for monitoring and managing the Transport Security Model for
   SNMP.

Table of Contents

   1. Introduction ....................................................3
      1.1. The Internet-Standard Management Framework .................3
      1.2. Conventions ................................................3
      1.3. Modularity .................................................4
      1.4. Motivation .................................................5
      1.5. Constraints ................................................5
   2. How the Transport Security Model Fits in the Architecture .......6
      2.1. Security Capabilities of this Model ........................6
           2.1.1. Threats .............................................6
           2.1.2. Security Levels .....................................7
      2.2. Transport Sessions .........................................7
      2.3. Coexistence ................................................7
           2.3.1. Coexistence with Message Processing Models ..........7
           2.3.2. Coexistence with Other Security Models ..............8
           2.3.3. Coexistence with Transport Models ...................8
   3. Cached Information and References ...............................8
      3.1. Transport Security Model Cached Information ................9
           3.1.1. securityStateReference ..............................9
           3.1.2. tmStateReference ....................................9
           3.1.3. Prefixes and securityNames ..........................9
   4. Processing an Outgoing Message .................................10
      4.1. Security Processing for an Outgoing Message ...............10
      4.2. Elements of Procedure for Outgoing Messages ...............11
   5. Processing an Incoming SNMP Message ............................12
      5.1. Security Processing for an Incoming Message ...............12
      5.2. Elements of Procedure for Incoming Messages ...............13
   6. MIB Module Overview ............................................14
      6.1. Structure of the MIB Module ...............................14
           6.1.1. The snmpTsmStats Subtree ...........................14
           6.1.2. The snmpTsmConfiguration Subtree ...................14
      6.2. Relationship to Other MIB Modules .........................14
           6.2.1. MIB Modules Required for IMPORTS ...................15
   7. MIB Module Definition ..........................................15
   8. Security Considerations ........................................20
      8.1. MIB Module Security .......................................20