SNMPv3 OVERVIEW: DESIGN DECISIONS ARCHITECTURE SNMP MESSAGE STRUCTURE

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Presentation transcript:

SNMPv3 OVERVIEW: DESIGN DECISIONS ARCHITECTURE SNMP MESSAGE STRUCTURE SECURE COMMUNICATION • USER SECURITY MODEL (USM) ACCESS CONTROL • VIEW BASED ACCESS CONTROL MODEL (VACM) IMPLEMENTATIONS RFCs Copyright © 2001 by Aiko Pras These sheets may be used for educational purposes

DESIGN DECISIONS ADDRESS THE NEED FOR SECURY SET SUPPORT DEFINE AN ARCHITECTURE THAT ALLOWS FOR LONGEVITY OF SNMP ALLOW THAT DIFFERENT PORTIONS OF THE ARCHITECTURE MOVE AT DIFFERENT SPEEDS TOWARDS STANDARD STATUS ALLOW FOR FUTURE EXTENSIONS KEEP SNMP AS SIMPLE AS POSSIBLE ALLOW FOR MINIMAL IMPLEMENTATIONS SUPPORT ALSO THE MORE COMPLEX FEATURES, WHICH ARE REQUIRED IN LARGE NETWORKS RE-USE EXISTING SPECIFICATIONS, WHENEVER POSSIBLE

SNMPv3 ARCHITECTURE

SNMPv3 ARCHITECTURE: MANAGER

SNMPv3 ARCHITECTURE: AGENT

CONCEPTS: snmpEngineID

CONCEPTS: Context

PRIMITIVES BETWEEN MODULES

sendPdu

prepareOutgoingMessage

generateRequestMsg

send / receive

prepareDataElements

processIncomingMsg

processPd

isAccessAllowed

returnResponsePdu

prepareResponseMessage

generateResponseMsg

send / receive

prepareDataElements

processIncomingMsg

processResponsePdu

MODULES OF THE SNMPv3 ARCHITECTURE DISPATCHER AND MESSAGE PROCESSING MODULE • SNMPv3 MESSAGE STRUCTURE • snmpMPDMIB • RFC 2572 APPLICATIONS • snmpTargetMIB • snmpNotificationMIB • snmpProxyMIB • RFC 2573 SECURITY SUBSYSTEM • USER BASED SECURITY MODEL • snmpUsmMIB • RFC 2574 ACCESS CONTROL SUBSYSTEM • VIEW BASED ACCESS CONTROL MODEL • snmpVacmMIB • RFC 2575

SNMPv3 MESSAGE STRUCTURE

SNMPv3 PROCESSING MODULE PARAMETERS

SECURE COMMUNICATION VERSUS ACCESS CONTROL

USM: SECURITY THREATS

USM MESSAGE STRUCTURE

IDEA BEHIND REPLAY PROTECTION

IDEA BEHIND DATA INTEGRITY AND AUTHENTICATION

IDEA BEHIND AUTHENTICATION

IDEA BEHIND THE DATA CONFIDENTIALITY (DES)

IDEA BEHIND ENCRYPTION

VIEW BASED ACCESS CONTROL MODEL ACCESS CONTROL TABLE MIB VIEWS

ACCESS CONTROL TABLES

MIB VIEWS

SNMPv3 IMPLEMENTATIONS ACE*COMM AdventNet BMC Software Cisco Epilogue Gambit communications Halcyon IBM ISI IWL MG-SOFT MultiPort Corporation SimpleSoft SNMP Research SNMP++ TU of Braunschweig UCD University of Quebec

SNMPv3 RFCs

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