Legacy-Compliant Data Authentication for Industrial Control System …€¦ · Legacy-Compliant...

transcript

ACNS20171111

Legacy-CompliantDataAuthenticationfor

IndustrialControlSystemTraffic

JohnHenryCastellanos,DanieleAntonioli,NilsOleTippenhauerandMartínOchoaSingaporeUniversityofTechnologyandDesign

15th InternationalConferenceonAppliedCryptographyandNetworkSecurityJapan,Kanazawa,July11,2017.

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Source:urvil.wordpress.com

AutomaticcontrolofIndustrialProcesses:

Manufacturingplants

Powerplants

Publictransportationinfrastructure

Utilityinfrastructure(watertreatment,gas/oil,powergeneration)

IndustrialControlSystemsWhatareICSs?

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Source:http://bcmpublicrelations.com/

IndustrialControlSystemsIndustryEvolution

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InformationTechnology:

ServersandClientPCs

Source:https://pgjonline.com/

OperationalTechnology:

Servers,PLCs,SCADA,HMIDevices,ActuatorsandSensors

IntegrityAttackscauseOperationalChanges

IndustrialControlSystemsITmeetsOT(PurdueModel)

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Cyber-securityinICSMotivation:IntegrityAttacks

ControlCenter

AttackerAttacker

TankLevelMonitor

ValveController

ChemicalDispenser

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ControlCenter

AttackerAttacker

TankLevelMonitor

ValveController

ChemicalDispenser

PLC Highlevel

!!Highlevel

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ControlCenter

AttackerAttacker

TankLevelMonitor

ValveController

ChemicalDispenser

Highlevel

Normallevel

!!Highlevel

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ControlCenter

AttackerAttacker

TankLevelMonitor

ValveController

ChemicalDispenser

Turnoffvalve

ReduceChemical

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ControlCenter

AttackerAttacker

TankLevelMonitor

ValveController

ChemicalDispenser

TurnonvalveIncrease

ChemicalTurnoffvalve

ReduceChemical

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ControlCenter

AttackerAttacker

TankLevelMonitor

ValveController

ChemicalDispenser

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ControlCenter

Highlevel

!!Highlevel

TankLevelMonitor

CountermeasuresAuthenticity&Integritychecks

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ControlCenter

!!Highlevel

TankLevelMonitor

Highlevel

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ControlCenter

!!Highlevel

TankLevelMonitor

Highlevel

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ControlCenter

!!Highlevel

TankLevelMonitor

Highlevel

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ControlCenter

!!Highlevel

TankLevelMonitor

Attacker

Highlevel

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ControlCenter

!!Highlevel

TankLevelMonitor

Attacker

Highlevel

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ControlCenter

!!Highlevel

TankLevelMonitor

Attacker

Highlevel

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ControlCenter

!!Highlevel

TankLevelMonitor

Attacker

Lowlevel

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ControlCenter

!!Highlevel

TankLevelMonitor

Attacker

Lowlevel

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Attribute InformationTechnologySystems(IT)

IndustrialControlSystems(OT)

ComponentLifetime

3to5years 10to15years

Connectivity Corporate network,IP-based,standardprotocols

ControlNetwork,proprietaryprotocols

PerformanceRequirements

Non-real-time Real-time

Sources:NIST:GuidetoIndustrialControlSystemsSecurity.800-82Rev2http://www.wbdg.org/

IndustrialControlSystemsIT/OTRequirements

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SecureWaterTreatment(SWaT)isatestbedforresearchintheareaofcybersecurity.

DatafromarealICSSWaTTestbed

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DatafromarealICSReal-timerequirements

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DatafromarealICSUnderstandingICSData

ByselectingCIPserviceswithcriticaldataourproposalavoidsadditionalprocessingandbandwidthoverheadsincomparisonwithsigningallCIPtraffic.

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DatafromarealICSUnderstandingICSData

ByselectingCIPserviceswithcriticaldataourproposalavoidsadditionalprocessingandbandwidthoverheadsincomparisonwithsigningallCIPtraffic.

CIPServices(CriticalData):Read_Tag

Write_Tag

Read_Tag_Fragmented

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ControlCenterPLC

Crypto-featuredHardware

BridgingNon-CriticalData

SigningCriticalData

VerifyingCriticalData

SPAProtocolSelectivePacketAuthentication

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AsSPAonlysigns/verifiesselectedcriticalpackets,itimprovestheoverallhardenedcommunicationrateofthesystemcomparedwithTLS.

ComparisonwithTLSSPAEvaluation

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ControlCenterPLC

Marking&BridgingCritical

SigningMarkedChunk

Marking&BridgingCritical

VerifyingMarkedChunk

ASPAProtocolAggregatedSelectivePacket

Authentication

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UsingAggregated-SPAthesystemwouldachievehighertolerancecommunicationlevelsprocessingdifferentpercentagesofcriticaldata.x-axisrepresentschunkofpacketstobesigned.

y-axisrepresentstoleranceatcommunicationlevelreachedbythesystem.

ComparisonwithTLSASPAEvaluation

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ControlCenter

TCP/IPSwitch

ImplementationRealScenarioonSWaTTestbed

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ControlCenter

TCP/IPSwitch

Signs Verifies

CriticalData

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ControlCenter

TCP/IPSwitch

SignsVerifies

CriticalData

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ControlCenter

TCP/IPSwitch

Updatesstats

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ControlCenter

TCP/IPSwitch

Monitorssystem

performance

MonitorsSystem

Performance

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*VM:VirtualMachine

Hardware Processor CPU Memory

Controllino ATmega2560Microcontroller

16MHz 256KB

ARM(VM*) ARM926EJ-S 540MHz 256MB

RaspberryPI2 Quad-core ARMCortex-A7

900MHz 1GB

RaspberryPI3 Quad-coreARMCortex-A53

1200MHz 1GB

PC(VM*) IntelCorei5-5300U 2300MHz 2GB

BenchmarkHardwareSelection

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DataSize(Bytes)

Controllino ARM RaspberryPI2

RaspberryPI3

64 2.2x104 76 53 15 2

128 3.3x104 78 58 16 2

256 5.5x104 84 69 18 3

512 1x105 117 89 32 4

1K 1.8x105 171 130 35 6

2K 3.6x105 252 211 58 10

4K 7x105 474 374 104 18

ECDSA N/A 1.5x105 1x105 3.2x104 3.1x103

AlldatainμsCryptographicAlgorithms:• Symmetric:HMAC-SHA256• Asymmetric:ECDSA

BenchmarkHardwarePerformance

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ASPAProtocolPerformanceEvaluation(Speed)

AggregatedSignature(Pksinachunk)20 40 60 80 100 120

MinPk/srequiredinSWaT

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FeaturesProtocols• Ourprotocolsarebackwardcompatible,astheytransmit

authenticationdataaspayloadinlegacyindustrialprotocols.

• Withinexpensiveandfasthardware(RaspberryPI),itisfeasibletoenhancelegacyplantswithauthenticchannelsforstrongsignaturealgorithmswithsimpleprotocols.

• ItisfeasibletosignificantlyraisethebaragainstattackersofICSbyincludingauthenticationbasedonmoderncryptographywithoutcompromisingefficiencyorcost.

• Weplantocomparethereal-timeconstraintsofSWaTwithconstraintsinotherICSTestbeds(SmartGrid).

Conclusions

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Thankyou

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BackupSlides

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Attribute InformationTechnologySystems(IT) IndustrialControlSystems(OT)

Purpose Process transaction,provideinformation Controls andmonitorphysicalprocesses

Role Supportpeople Controlmachines

Architecture Enterprisewideinfrastructureandapplications Event-driven,real-time,embeddedhardwareandcustomizedsoftware

ComponentLifetime

3to5years 10to15years

Interfaces GUI,Webbrowser,terminalandkeyboard Electromechanical, sensors,actuators,codeddisplays

Connectivity Corporate network,IP-based,standardprotocols ControlNetwork,proprietaryprotocols

PerformanceRequirements

Non-real-time Real-time

Majorriskimpacts Delayofbusinessoperations Environmentalimpacts,lossoflife,equipment, orproduction

Sources:NIST:GuidetoIndustrialControlSystemsSecurity.800-82Rev2http://www.wbdg.org/

IndustrialControlSystemsIT/OTRequirements

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InjectingdataintoEthernetIPProtocol

EthernetFrameEthernetHeader

IPHeader

14Bytes 20Bytes

TCP/UDPHeader20Bytes

EncapsulationHeader

EncapsulationData CRC

EncapsulationPacket

Command Length

2Bytes 2Bytes

SessionHandle

4Bytes

Status SenderContext Options

8Bytes4Bytes 4Bytes

EncapsulationHeader

ItemCount(Usual=2) TypeID

2Bytes 2Bytes

Length(l1)

2Bytes

Data(ConnectionID)

l1 Bytes

TypeID

2Bytes

Length(l2)

2Bytes

Data(CIPData)l2 Bytes

AddressItem DataItemEncapsulationData(CommonPacketFormat)

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InjectingdataintoEthernetIPProtocol

EthernetFrameEthernetHeader

IPHeader

14Bytes 20Bytes

TCP/UDPHeader20Bytes

EncapsulationHeader

EncapsulationData CRC

EncapsulationPacket

Command Length

2Bytes 2Bytes

SessionHandle

4Bytes

Status SenderContext Options

8Bytes4Bytes 4Bytes

EncapsulationHeader

ItemCount(Usual=2) TypeID

2Bytes 2Bytes

Length(l1)

2Bytes

Data(ConnectionID)

l1 Bytes

TypeID

2Bytes

Length(l2)

2Bytes

Data(CIPData)l2 Bytes

AddressItem DataItem

TypeID

2Bytes

Length(l3)

2Bytes

Data(Signature)

l3 Bytes

SignatureItemEncapsulationData(CommonPacketFormat)

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AuthenticationProtocolsImplementation:RealScenarioonSWaTTestbed

• SCADA’s supervisory reads PLCvariables of signing-verificationprocess.

• Statistics about integrity checks mightbe summarize.

• In case of integrity violations happenan alarm will trigger.

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ARaspberryPIisdirectlyconnectedbetweenthehardenedPLCanditsclosestswitch.ItbridgescommunicationbetweenthePLCandtherestofthesystem.

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Different tags were configured atPLC program to store statisticsabout signing/verification process.It allows to monitor the processand debug it.

Legacy-Compliant Data Authentication for Industrial Control System …€¦ · Legacy-Compliant...

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