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vehiclecloud.tla
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vehiclecloud.tla
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------------------------------ MODULE vehiclecloud ------------------------------
EXTENDS Naturals, TLC, Sequences, FiniteSets
(* --algorithm VehicleCloud
variables
\* Set by the cloud in order to decide whether a client request is allowed
clientAuthorised = FALSE;
\* Determines whether the client is in the process of fetching data from the operations terminal (via the cloud)
clientViewingData = FALSE;
\* Determines whether the cloud have checked (or validated) the client id for some request (synchronisation variable)
\* Related to this, the variable 'clientAuthorised' indicates whether the client request is allowed.
interactiveCloudCheckedId = FALSE;
\* Determines whether the cloud has delived the firmware to the operations terminal
interactiveCloudDeliveredFirmware = FALSE;
\* Determines whether the cloud has sent a firmware acknowledgement to the client (synchronisation variable)
interactiveCloudFirmwareAckSent = FALSE;
\* True if location A (the only location that we model) is suspended, false otherwise
interactiveCloudLocationSuspended \in {TRUE, FALSE};
\* True if the ID of the client is trusted, false otherwise.
clientIdTrusted \in {TRUE, FALSE};
\* True when the service cloud has received new data from the operations terminal (synchronisation variable)
serviceCloudDataReceived = FALSE;
\* The most recent data that the service cloud has received from the operations terminal
serviceCloudDataSnapshot = FALSE;
\* Determines whether the gateway allows inwards communication
gatewayInwardsOpen = FALSE;
\* Determines whether the gateway has sent a firmware acknowledgement (synchronisation variable)
gatewayFirmwareAckSent = FALSE;
\* Determines whether the gateway has delivered the firmware to the operations terminal
gatewayDeliveredFirmware = FALSE;
\* Determines whether the operations terminal has sent a firmware acknowledgement to the cloud (synchronisation variable)
otFirmwareAckSent = FALSE;
\* The most recent data sent by the operations terminal.
\* The operations terminal simply toggles this variable every time data is sent.
\* This allows us to confirm that the service cloud receives different data
otLatestData = FALSE;
\* True if the operations terminal has sent new data to the service cloud (synchronisation variable)
otDataSentToServiceCloud = FALSE;
\* Determines whether the latest data has been signed by the operations terminal
otDataSigned = FALSE;
\* Used for storing (valid) firmware received from the client
otStorage = NO_FIRMWARE;
\* Indicates the status of the firmware received from the client
\* See firmware status codes below for valid values
otFirmwareStatus = FIRMWARE_STATUS_NO_STATUS;
otDataRedirected = FALSE;
otDataTransmissionBlocked = FALSE;
\* A copy of the firmware used by the control network
otInstalledFirmware = LET timeStamp == 1
IN
<<timeStamp, ValidFirmware>>;
\* True if someone inserted a USB device and failed to provide the authorisation password within a safety time limit. False otherwise
otUsbUnauthorisedAccess = FALSE;
\* Determines whether the cloud has sent data to the client (synchronisation variable)
cloudDataSent = FALSE;
\* Firmware that the client will upload to the operations terminal
clientFirmware = NO_FIRMWARE;
define
\* Processes
GATEWAY == 1
OT == 2
INTERACTIVE_CLOUD == 4
CLIENT == 5
SERVICE_CLOUD == 6
\* Firmware status codes
FIRMWARE_STATUS_OK == 1
FIRMWARE_STATUS_INVALID_SIGNATURE == 2
FIRMWARE_STATUS_NOT_GENUINE == 3
FIRMWARE_STATUS_INSUFFICIENT_STORAGE == 4
FIRMWARE_STATUS_NO_STATUS == 5
\* All firmware status codes
ALL_FIRMWARE_STATUS_CODES == {FIRMWARE_STATUS_OK,
FIRMWARE_STATUS_INVALID_SIGNATURE,
FIRMWARE_STATUS_NOT_GENUINE,
FIRMWARE_STATUS_INSUFFICIENT_STORAGE,
FIRMWARE_STATUS_NO_STATUS}
\* Used to indicate the absence of client firmware
NO_FIRMWARE == <<>>
\* Set of all firmwares
AllFirmware == [ signatureValid : BOOLEAN, genuine : BOOLEAN, size : BOOLEAN ]
\* True if the client is sending firmware, false otherwise
ClientSendingFirmware == clientFirmware /= NO_FIRMWARE
\* Has any client request been sent?
ClientRequestSent == ClientSendingFirmware \/ clientViewingData
\* The firmware timestamp index
FirmwareTimestampIndex == 1
\* The firmware value index
FirmwareValueIndex == 2
\* For a piece of firmware to be considered valid it must have a valid signature, be genuine and fit the operations terminal storage
ValidFirmware == [signatureValid |-> TRUE, genuine |-> TRUE, size |-> TRUE]
\* Check that 'firmware' is valid
FirmwareValid(firmware) == firmware /= NO_FIRMWARE /\
firmware[FirmwareValueIndex].signatureValid /\
firmware[FirmwareValueIndex].genuine /\
firmware[FirmwareValueIndex].size
\* Check that firmware signature is valid
FirmwareHasValidSignature(firmware) == firmware[FirmwareValueIndex].signatureValid
\* Check that firmware is genuine
FirmwareIsGenuine(firmware) == firmware[FirmwareValueIndex].genuine
\* Check that the firmware fits the operations terminal storage
FirmwareFitsStorage(firmware) == firmware[FirmwareValueIndex].size
\* Compute next firmware timestamp
NextFirmwareTimestamp == 1 + otInstalledFirmware[FirmwareTimestampIndex]
\* Determines whether the service cloud has waited too long for the operations terminal to deliver the data.
\* Since we don't model time explicitly, we simply say that the time limit has passed once the
\* data has been redirected to some sink
DataDeliveryTimeElapsed == otDataRedirected
end define
fair process client = CLIENT
variable
\* Used to store data fetched from the service cloud
clientData = FALSE
begin
ClientBegin:
either ClientSendFirmwareUpdate:
\* Get firmware to send
with clientFirmwareToSend \in AllFirmware do
clientFirmware := <<NextFirmwareTimestamp, clientFirmwareToSend>>;
end with;
or ClientViewData:
\* Fetch newest data
clientViewingData := TRUE;
end either;
\* Wait for cloud to check id
ClientAwaitingIdCheck:
await interactiveCloudCheckedId;
if clientAuthorised then
\* Wait for firmware acknowledgement
if ClientSendingFirmware then
ClientAwaitingFirmwareAck:
await interactiveCloudFirmwareAckSent;
clientFirmware := NO_FIRMWARE;
elsif clientViewingData then
ClientUpdateData:
await cloudDataSent;
clientData := serviceCloudDataSnapshot;
cloudDataSent := FALSE;
end if;
end if;
end process
fair process serviceCloud = SERVICE_CLOUD
begin
ServiceCloudBegin:
await otDataSentToServiceCloud \/ DataDeliveryTimeElapsed;
if DataDeliveryTimeElapsed then
\* Security measure: prevent operations terminal from sending data
otDataTransmissionBlocked := TRUE;
goto ServiceCloudDone;
else
ServiceCloudReceiveData:
with oldData = serviceCloudDataSnapshot do
\* The data must be new
if otDataSigned then
serviceCloudDataSnapshot := otLatestData;
end if;
\* If the data is not signed by the operations terminal the data snapshot will not be updated
assert (~otDataSigned) => (serviceCloudDataSnapshot = oldData);
serviceCloudDataReceived := TRUE;
otDataSentToServiceCloud := FALSE;
end with;
end if;
ServiceCloudEndCycle:
\* Repeat
goto ServiceCloudBegin;
ServiceCloudDone:
skip;
end process;
fair process interactiveCloud = INTERACTIVE_CLOUD
begin
InteractiveCloudBegin:
await ClientRequestSent;
if interactiveCloudLocationSuspended then
\* Location A is already suspended
clientAuthorised := FALSE;
interactiveCloudCheckedId := TRUE;
else
\* Location A is not suspended
if clientIdTrusted then
clientAuthorised := TRUE;
interactiveCloudCheckedId := TRUE;
if ClientSendingFirmware then
InteractiveCloudAttemptSendingFirmware:
\* Send firmware
interactiveCloudDeliveredFirmware := TRUE;
\* ACKFWUpdate
CloudAwaitingFirmwareAck:
await gatewayFirmwareAckSent;
InteractiveCloudRelayFirmwareAck:
interactiveCloudFirmwareAckSent := TRUE;
\* TODO: Send firmware status
else
InteractiveCloudDeliverData:
assert clientViewingData;
cloudDataSent := TRUE;
\* The service cloud is responsible for fetching the most recent data from the operations terminal
end if
else
assert ~interactiveCloudLocationSuspended;
\* Location A is now suspended
interactiveCloudLocationSuspended := TRUE;
clientAuthorised := FALSE;
interactiveCloudCheckedId := TRUE;
end if;
end if;
end process;
fair process gateway = GATEWAY
begin
GatewayAwaitingFirmware:
\* Proceed once the firmware has been received, or when the client cloud has terminated.
\* If we proceed due to client cloud termination it simply means that the client was viewing data,
\* hence no client-to-vehicle communication is needed. In that case, the gateway can terminate.
await interactiveCloudDeliveredFirmware \/ pc[INTERACTIVE_CLOUD] = "Done";
if interactiveCloudDeliveredFirmware then
with b \in {TRUE, FALSE} do
gatewayInwardsOpen := b;
end with;
if gatewayInwardsOpen then
assert clientAuthorised;
gatewayDeliveredFirmware := TRUE;
GatewayAwaitingFirmwareAck:
await otFirmwareAckSent;
end if;
GatewayAwaitingOT:
gatewayFirmwareAckSent := TRUE;
end if;
end process;
fair process ot = OT
begin
OTBegin:
skip;
OTSendData:
if ~otDataTransmissionBlocked then
\* Send data
otLatestData := ~otLatestData;
with b \in {TRUE, FALSE} do
otDataSigned := b;
end with;
serviceCloudDataReceived := FALSE;
either OTSendToServiceCloud:
otDataSentToServiceCloud := TRUE;
assert ~otDataRedirected;
OTAwaitingServiceCloud:
await serviceCloudDataReceived;
or OTRedirectData:
otDataRedirected := TRUE;
assert ~otDataSentToServiceCloud;
end either;
OTFinishSendingData:
otDataRedirected := FALSE;
else
OTLogDataBlock:
skip;
end if;
OTReadUSB:
\* USB connected
\* Security log: USB connected
either OTUSBConnected:
either OTPasswordOK:
skip;
or OTPasswordNotOk:
otUsbUnauthorisedAccess := TRUE;
OTUsbSecurityEventReset:
otUsbUnauthorisedAccess := FALSE;
end either;
or OTUSBNotConnected:
skip;
end either;
OTReceiveFirmware:
if gatewayDeliveredFirmware then
if FirmwareHasValidSignature(clientFirmware) then
OTFirmwareValidSignature:
\* Perform integrity check
if FirmwareIsGenuine(clientFirmware) then
\* Store firmware, if there's space enough left
OTFirmwareGenuine:
if FirmwareFitsStorage(clientFirmware) then
OTFirmwareSpaceAvailable:
\* Store firmware
\* Alert
assert otStorage = NO_FIRMWARE;
otFirmwareStatus := FIRMWARE_STATUS_OK;
otStorage := clientFirmware;
else
OTFirmwareSpaceNotAvailable:
\* Alert
otFirmwareStatus := FIRMWARE_STATUS_INSUFFICIENT_STORAGE;
end if;
else
OTFirmwareNotGenuine:
\* Security log: not geuine
otFirmwareStatus := FIRMWARE_STATUS_NOT_GENUINE;
skip;
end if;
else
OTFirmwareInvalidSignature:
\* Security log: invalid signature
otFirmwareStatus := FIRMWARE_STATUS_INVALID_SIGNATURE;
skip;
end if;
OTSendAck:
otFirmwareAckSent := TRUE;
\* Expect new firmware
interactiveCloudDeliveredFirmware := FALSE;
gatewayDeliveredFirmware := FALSE;
end if;
OTHandlePendingRequests:
goto OTBegin;
end process;
end algorithm; *)
\* BEGIN TRANSLATION
VARIABLES clientAuthorised, clientViewingData, interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware, interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended, clientIdTrusted,
serviceCloudDataReceived, serviceCloudDataSnapshot,
gatewayInwardsOpen, gatewayFirmwareAckSent,
gatewayDeliveredFirmware, otFirmwareAckSent, otLatestData,
otDataSentToServiceCloud, otDataSigned, otStorage, otFirmwareStatus,
otDataRedirected, otDataTransmissionBlocked, otInstalledFirmware,
otUsbUnauthorisedAccess, cloudDataSent, clientFirmware, pc
(* define statement *)
GATEWAY == 1
OT == 2
INTERACTIVE_CLOUD == 4
CLIENT == 5
SERVICE_CLOUD == 6
FIRMWARE_STATUS_OK == 1
FIRMWARE_STATUS_INVALID_SIGNATURE == 2
FIRMWARE_STATUS_NOT_GENUINE == 3
FIRMWARE_STATUS_INSUFFICIENT_STORAGE == 4
FIRMWARE_STATUS_NO_STATUS == 5
ALL_FIRMWARE_STATUS_CODES == {FIRMWARE_STATUS_OK,
FIRMWARE_STATUS_INVALID_SIGNATURE,
FIRMWARE_STATUS_NOT_GENUINE,
FIRMWARE_STATUS_INSUFFICIENT_STORAGE,
FIRMWARE_STATUS_NO_STATUS}
NO_FIRMWARE == <<>>
AllFirmware == [ signatureValid : BOOLEAN, genuine : BOOLEAN, size : BOOLEAN ]
ClientSendingFirmware == clientFirmware /= NO_FIRMWARE
ClientRequestSent == ClientSendingFirmware \/ clientViewingData
FirmwareTimestampIndex == 1
FirmwareValueIndex == 2
ValidFirmware == [signatureValid |-> TRUE, genuine |-> TRUE, size |-> TRUE]
FirmwareValid(firmware) == firmware /= NO_FIRMWARE /\
firmware[FirmwareValueIndex].signatureValid /\
firmware[FirmwareValueIndex].genuine /\
firmware[FirmwareValueIndex].size
FirmwareHasValidSignature(firmware) == firmware[FirmwareValueIndex].signatureValid
FirmwareIsGenuine(firmware) == firmware[FirmwareValueIndex].genuine
FirmwareFitsStorage(firmware) == firmware[FirmwareValueIndex].size
NextFirmwareTimestamp == 1 + otInstalledFirmware[FirmwareTimestampIndex]
DataDeliveryTimeElapsed == otDataRedirected
VARIABLE clientData
vars == << clientAuthorised, clientViewingData, interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware, interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended, clientIdTrusted,
serviceCloudDataReceived, serviceCloudDataSnapshot,
gatewayInwardsOpen, gatewayFirmwareAckSent,
gatewayDeliveredFirmware, otFirmwareAckSent, otLatestData,
otDataSentToServiceCloud, otDataSigned, otStorage,
otFirmwareStatus, otDataRedirected, otDataTransmissionBlocked,
otInstalledFirmware, otUsbUnauthorisedAccess, cloudDataSent,
clientFirmware, pc, clientData >>
ProcSet == {CLIENT} \cup {SERVICE_CLOUD} \cup {INTERACTIVE_CLOUD} \cup {GATEWAY} \cup {OT}
Init == (* Global variables *)
/\ clientAuthorised = FALSE
/\ clientViewingData = FALSE
/\ interactiveCloudCheckedId = FALSE
/\ interactiveCloudDeliveredFirmware = FALSE
/\ interactiveCloudFirmwareAckSent = FALSE
/\ interactiveCloudLocationSuspended \in {TRUE, FALSE}
/\ clientIdTrusted \in {TRUE, FALSE}
/\ serviceCloudDataReceived = FALSE
/\ serviceCloudDataSnapshot = FALSE
/\ gatewayInwardsOpen = FALSE
/\ gatewayFirmwareAckSent = FALSE
/\ gatewayDeliveredFirmware = FALSE
/\ otFirmwareAckSent = FALSE
/\ otLatestData = FALSE
/\ otDataSentToServiceCloud = FALSE
/\ otDataSigned = FALSE
/\ otStorage = NO_FIRMWARE
/\ otFirmwareStatus = FIRMWARE_STATUS_NO_STATUS
/\ otDataRedirected = FALSE
/\ otDataTransmissionBlocked = FALSE
/\ otInstalledFirmware = (LET timeStamp == 1
IN
<<timeStamp, ValidFirmware>>)
/\ otUsbUnauthorisedAccess = FALSE
/\ cloudDataSent = FALSE
/\ clientFirmware = NO_FIRMWARE
(* Process client *)
/\ clientData = FALSE
/\ pc = [self \in ProcSet |-> CASE self = CLIENT -> "ClientBegin"
[] self = SERVICE_CLOUD -> "ServiceCloudBegin"
[] self = INTERACTIVE_CLOUD -> "InteractiveCloudBegin"
[] self = GATEWAY -> "GatewayAwaitingFirmware"
[] self = OT -> "OTBegin"]
ClientBegin == /\ pc[CLIENT] = "ClientBegin"
/\ \/ /\ pc' = [pc EXCEPT ![CLIENT] = "ClientSendFirmwareUpdate"]
\/ /\ pc' = [pc EXCEPT ![CLIENT] = "ClientViewData"]
/\ UNCHANGED << clientAuthorised, clientViewingData,
interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware,
interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended,
clientIdTrusted, serviceCloudDataReceived,
serviceCloudDataSnapshot, gatewayInwardsOpen,
gatewayFirmwareAckSent,
gatewayDeliveredFirmware, otFirmwareAckSent,
otLatestData, otDataSentToServiceCloud,
otDataSigned, otStorage, otFirmwareStatus,
otDataRedirected, otDataTransmissionBlocked,
otInstalledFirmware, otUsbUnauthorisedAccess,
cloudDataSent, clientFirmware, clientData >>
ClientSendFirmwareUpdate == /\ pc[CLIENT] = "ClientSendFirmwareUpdate"
/\ \E clientFirmwareToSend \in AllFirmware:
clientFirmware' = <<NextFirmwareTimestamp, clientFirmwareToSend>>
/\ pc' = [pc EXCEPT ![CLIENT] = "ClientAwaitingIdCheck"]
/\ UNCHANGED << clientAuthorised,
clientViewingData,
interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware,
interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended,
clientIdTrusted,
serviceCloudDataReceived,
serviceCloudDataSnapshot,
gatewayInwardsOpen,
gatewayFirmwareAckSent,
gatewayDeliveredFirmware,
otFirmwareAckSent, otLatestData,
otDataSentToServiceCloud,
otDataSigned, otStorage,
otFirmwareStatus, otDataRedirected,
otDataTransmissionBlocked,
otInstalledFirmware,
otUsbUnauthorisedAccess,
cloudDataSent, clientData >>
ClientViewData == /\ pc[CLIENT] = "ClientViewData"
/\ clientViewingData' = TRUE
/\ pc' = [pc EXCEPT ![CLIENT] = "ClientAwaitingIdCheck"]
/\ UNCHANGED << clientAuthorised, interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware,
interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended,
clientIdTrusted, serviceCloudDataReceived,
serviceCloudDataSnapshot, gatewayInwardsOpen,
gatewayFirmwareAckSent,
gatewayDeliveredFirmware, otFirmwareAckSent,
otLatestData, otDataSentToServiceCloud,
otDataSigned, otStorage, otFirmwareStatus,
otDataRedirected, otDataTransmissionBlocked,
otInstalledFirmware, otUsbUnauthorisedAccess,
cloudDataSent, clientFirmware, clientData >>
ClientAwaitingIdCheck == /\ pc[CLIENT] = "ClientAwaitingIdCheck"
/\ interactiveCloudCheckedId
/\ IF clientAuthorised
THEN /\ IF ClientSendingFirmware
THEN /\ pc' = [pc EXCEPT ![CLIENT] = "ClientAwaitingFirmwareAck"]
ELSE /\ IF clientViewingData
THEN /\ pc' = [pc EXCEPT ![CLIENT] = "ClientUpdateData"]
ELSE /\ pc' = [pc EXCEPT ![CLIENT] = "Done"]
ELSE /\ pc' = [pc EXCEPT ![CLIENT] = "Done"]
/\ UNCHANGED << clientAuthorised, clientViewingData,
interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware,
interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended,
clientIdTrusted,
serviceCloudDataReceived,
serviceCloudDataSnapshot,
gatewayInwardsOpen,
gatewayFirmwareAckSent,
gatewayDeliveredFirmware,
otFirmwareAckSent, otLatestData,
otDataSentToServiceCloud,
otDataSigned, otStorage,
otFirmwareStatus, otDataRedirected,
otDataTransmissionBlocked,
otInstalledFirmware,
otUsbUnauthorisedAccess,
cloudDataSent, clientFirmware,
clientData >>
ClientAwaitingFirmwareAck == /\ pc[CLIENT] = "ClientAwaitingFirmwareAck"
/\ interactiveCloudFirmwareAckSent
/\ clientFirmware' = NO_FIRMWARE
/\ pc' = [pc EXCEPT ![CLIENT] = "Done"]
/\ UNCHANGED << clientAuthorised,
clientViewingData,
interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware,
interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended,
clientIdTrusted,
serviceCloudDataReceived,
serviceCloudDataSnapshot,
gatewayInwardsOpen,
gatewayFirmwareAckSent,
gatewayDeliveredFirmware,
otFirmwareAckSent, otLatestData,
otDataSentToServiceCloud,
otDataSigned, otStorage,
otFirmwareStatus,
otDataRedirected,
otDataTransmissionBlocked,
otInstalledFirmware,
otUsbUnauthorisedAccess,
cloudDataSent, clientData >>
ClientUpdateData == /\ pc[CLIENT] = "ClientUpdateData"
/\ cloudDataSent
/\ clientData' = serviceCloudDataSnapshot
/\ cloudDataSent' = FALSE
/\ pc' = [pc EXCEPT ![CLIENT] = "Done"]
/\ UNCHANGED << clientAuthorised, clientViewingData,
interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware,
interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended,
clientIdTrusted, serviceCloudDataReceived,
serviceCloudDataSnapshot,
gatewayInwardsOpen, gatewayFirmwareAckSent,
gatewayDeliveredFirmware,
otFirmwareAckSent, otLatestData,
otDataSentToServiceCloud, otDataSigned,
otStorage, otFirmwareStatus,
otDataRedirected,
otDataTransmissionBlocked,
otInstalledFirmware,
otUsbUnauthorisedAccess, clientFirmware >>
client == ClientBegin \/ ClientSendFirmwareUpdate \/ ClientViewData
\/ ClientAwaitingIdCheck \/ ClientAwaitingFirmwareAck
\/ ClientUpdateData
ServiceCloudBegin == /\ pc[SERVICE_CLOUD] = "ServiceCloudBegin"
/\ otDataSentToServiceCloud \/ DataDeliveryTimeElapsed
/\ IF DataDeliveryTimeElapsed
THEN /\ otDataTransmissionBlocked' = TRUE
/\ pc' = [pc EXCEPT ![SERVICE_CLOUD] = "ServiceCloudDone"]
ELSE /\ pc' = [pc EXCEPT ![SERVICE_CLOUD] = "ServiceCloudReceiveData"]
/\ UNCHANGED otDataTransmissionBlocked
/\ UNCHANGED << clientAuthorised, clientViewingData,
interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware,
interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended,
clientIdTrusted, serviceCloudDataReceived,
serviceCloudDataSnapshot,
gatewayInwardsOpen,
gatewayFirmwareAckSent,
gatewayDeliveredFirmware,
otFirmwareAckSent, otLatestData,
otDataSentToServiceCloud, otDataSigned,
otStorage, otFirmwareStatus,
otDataRedirected, otInstalledFirmware,
otUsbUnauthorisedAccess, cloudDataSent,
clientFirmware, clientData >>
ServiceCloudReceiveData == /\ pc[SERVICE_CLOUD] = "ServiceCloudReceiveData"
/\ LET oldData == serviceCloudDataSnapshot IN
/\ IF otDataSigned
THEN /\ serviceCloudDataSnapshot' = otLatestData
ELSE /\ TRUE
/\ UNCHANGED serviceCloudDataSnapshot
/\ Assert((~otDataSigned) => (serviceCloudDataSnapshot' = oldData),
"Failure of assertion at line 209, column 17.")
/\ serviceCloudDataReceived' = TRUE
/\ otDataSentToServiceCloud' = FALSE
/\ pc' = [pc EXCEPT ![SERVICE_CLOUD] = "ServiceCloudEndCycle"]
/\ UNCHANGED << clientAuthorised, clientViewingData,
interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware,
interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended,
clientIdTrusted, gatewayInwardsOpen,
gatewayFirmwareAckSent,
gatewayDeliveredFirmware,
otFirmwareAckSent, otLatestData,
otDataSigned, otStorage,
otFirmwareStatus, otDataRedirected,
otDataTransmissionBlocked,
otInstalledFirmware,
otUsbUnauthorisedAccess,
cloudDataSent, clientFirmware,
clientData >>
ServiceCloudEndCycle == /\ pc[SERVICE_CLOUD] = "ServiceCloudEndCycle"
/\ pc' = [pc EXCEPT ![SERVICE_CLOUD] = "ServiceCloudBegin"]
/\ UNCHANGED << clientAuthorised, clientViewingData,
interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware,
interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended,
clientIdTrusted,
serviceCloudDataReceived,
serviceCloudDataSnapshot,
gatewayInwardsOpen,
gatewayFirmwareAckSent,
gatewayDeliveredFirmware,
otFirmwareAckSent, otLatestData,
otDataSentToServiceCloud, otDataSigned,
otStorage, otFirmwareStatus,
otDataRedirected,
otDataTransmissionBlocked,
otInstalledFirmware,
otUsbUnauthorisedAccess, cloudDataSent,
clientFirmware, clientData >>
ServiceCloudDone == /\ pc[SERVICE_CLOUD] = "ServiceCloudDone"
/\ TRUE
/\ pc' = [pc EXCEPT ![SERVICE_CLOUD] = "Done"]
/\ UNCHANGED << clientAuthorised, clientViewingData,
interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware,
interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended,
clientIdTrusted, serviceCloudDataReceived,
serviceCloudDataSnapshot,
gatewayInwardsOpen, gatewayFirmwareAckSent,
gatewayDeliveredFirmware,
otFirmwareAckSent, otLatestData,
otDataSentToServiceCloud, otDataSigned,
otStorage, otFirmwareStatus,
otDataRedirected,
otDataTransmissionBlocked,
otInstalledFirmware,
otUsbUnauthorisedAccess, cloudDataSent,
clientFirmware, clientData >>
serviceCloud == ServiceCloudBegin \/ ServiceCloudReceiveData
\/ ServiceCloudEndCycle \/ ServiceCloudDone
InteractiveCloudBegin == /\ pc[INTERACTIVE_CLOUD] = "InteractiveCloudBegin"
/\ ClientRequestSent
/\ IF interactiveCloudLocationSuspended
THEN /\ clientAuthorised' = FALSE
/\ interactiveCloudCheckedId' = TRUE
/\ pc' = [pc EXCEPT ![INTERACTIVE_CLOUD] = "Done"]
/\ UNCHANGED interactiveCloudLocationSuspended
ELSE /\ IF clientIdTrusted
THEN /\ clientAuthorised' = TRUE
/\ interactiveCloudCheckedId' = TRUE
/\ IF ClientSendingFirmware
THEN /\ pc' = [pc EXCEPT ![INTERACTIVE_CLOUD] = "InteractiveCloudAttemptSendingFirmware"]
ELSE /\ pc' = [pc EXCEPT ![INTERACTIVE_CLOUD] = "InteractiveCloudDeliverData"]
/\ UNCHANGED interactiveCloudLocationSuspended
ELSE /\ Assert(~interactiveCloudLocationSuspended,
"Failure of assertion at line 258, column 13.")
/\ interactiveCloudLocationSuspended' = TRUE
/\ clientAuthorised' = FALSE
/\ interactiveCloudCheckedId' = TRUE
/\ pc' = [pc EXCEPT ![INTERACTIVE_CLOUD] = "Done"]
/\ UNCHANGED << clientViewingData,
interactiveCloudDeliveredFirmware,
interactiveCloudFirmwareAckSent,
clientIdTrusted,
serviceCloudDataReceived,
serviceCloudDataSnapshot,
gatewayInwardsOpen,
gatewayFirmwareAckSent,
gatewayDeliveredFirmware,
otFirmwareAckSent, otLatestData,
otDataSentToServiceCloud,
otDataSigned, otStorage,
otFirmwareStatus, otDataRedirected,
otDataTransmissionBlocked,
otInstalledFirmware,
otUsbUnauthorisedAccess,
cloudDataSent, clientFirmware,
clientData >>
InteractiveCloudAttemptSendingFirmware == /\ pc[INTERACTIVE_CLOUD] = "InteractiveCloudAttemptSendingFirmware"
/\ interactiveCloudDeliveredFirmware' = TRUE
/\ pc' = [pc EXCEPT ![INTERACTIVE_CLOUD] = "CloudAwaitingFirmwareAck"]
/\ UNCHANGED << clientAuthorised,
clientViewingData,
interactiveCloudCheckedId,
interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended,
clientIdTrusted,
serviceCloudDataReceived,
serviceCloudDataSnapshot,
gatewayInwardsOpen,
gatewayFirmwareAckSent,
gatewayDeliveredFirmware,
otFirmwareAckSent,
otLatestData,
otDataSentToServiceCloud,
otDataSigned,
otStorage,
otFirmwareStatus,
otDataRedirected,
otDataTransmissionBlocked,
otInstalledFirmware,
otUsbUnauthorisedAccess,
cloudDataSent,
clientFirmware,
clientData >>
CloudAwaitingFirmwareAck == /\ pc[INTERACTIVE_CLOUD] = "CloudAwaitingFirmwareAck"
/\ gatewayFirmwareAckSent
/\ pc' = [pc EXCEPT ![INTERACTIVE_CLOUD] = "InteractiveCloudRelayFirmwareAck"]
/\ UNCHANGED << clientAuthorised,
clientViewingData,
interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware,
interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended,
clientIdTrusted,
serviceCloudDataReceived,
serviceCloudDataSnapshot,
gatewayInwardsOpen,
gatewayFirmwareAckSent,
gatewayDeliveredFirmware,
otFirmwareAckSent, otLatestData,
otDataSentToServiceCloud,
otDataSigned, otStorage,
otFirmwareStatus, otDataRedirected,
otDataTransmissionBlocked,
otInstalledFirmware,
otUsbUnauthorisedAccess,
cloudDataSent, clientFirmware,
clientData >>
InteractiveCloudRelayFirmwareAck == /\ pc[INTERACTIVE_CLOUD] = "InteractiveCloudRelayFirmwareAck"
/\ interactiveCloudFirmwareAckSent' = TRUE
/\ pc' = [pc EXCEPT ![INTERACTIVE_CLOUD] = "Done"]
/\ UNCHANGED << clientAuthorised,
clientViewingData,
interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware,
interactiveCloudLocationSuspended,
clientIdTrusted,
serviceCloudDataReceived,
serviceCloudDataSnapshot,
gatewayInwardsOpen,
gatewayFirmwareAckSent,
gatewayDeliveredFirmware,
otFirmwareAckSent,
otLatestData,
otDataSentToServiceCloud,
otDataSigned, otStorage,
otFirmwareStatus,
otDataRedirected,
otDataTransmissionBlocked,
otInstalledFirmware,
otUsbUnauthorisedAccess,
cloudDataSent,
clientFirmware, clientData >>
InteractiveCloudDeliverData == /\ pc[INTERACTIVE_CLOUD] = "InteractiveCloudDeliverData"
/\ Assert(clientViewingData,
"Failure of assertion at line 252, column 21.")
/\ cloudDataSent' = TRUE
/\ pc' = [pc EXCEPT ![INTERACTIVE_CLOUD] = "Done"]
/\ UNCHANGED << clientAuthorised,
clientViewingData,
interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware,
interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended,
clientIdTrusted,
serviceCloudDataReceived,
serviceCloudDataSnapshot,
gatewayInwardsOpen,
gatewayFirmwareAckSent,
gatewayDeliveredFirmware,
otFirmwareAckSent, otLatestData,
otDataSentToServiceCloud,
otDataSigned, otStorage,
otFirmwareStatus,
otDataRedirected,
otDataTransmissionBlocked,
otInstalledFirmware,
otUsbUnauthorisedAccess,
clientFirmware, clientData >>
interactiveCloud == InteractiveCloudBegin
\/ InteractiveCloudAttemptSendingFirmware
\/ CloudAwaitingFirmwareAck
\/ InteractiveCloudRelayFirmwareAck
\/ InteractiveCloudDeliverData
GatewayAwaitingFirmware == /\ pc[GATEWAY] = "GatewayAwaitingFirmware"
/\ interactiveCloudDeliveredFirmware \/ pc[INTERACTIVE_CLOUD] = "Done"
/\ IF interactiveCloudDeliveredFirmware
THEN /\ \E b \in {TRUE, FALSE}:
gatewayInwardsOpen' = b
/\ IF gatewayInwardsOpen'
THEN /\ Assert(clientAuthorised,
"Failure of assertion at line 282, column 13.")
/\ gatewayDeliveredFirmware' = TRUE
/\ pc' = [pc EXCEPT ![GATEWAY] = "GatewayAwaitingFirmwareAck"]
ELSE /\ pc' = [pc EXCEPT ![GATEWAY] = "GatewayAwaitingOT"]
/\ UNCHANGED gatewayDeliveredFirmware
ELSE /\ pc' = [pc EXCEPT ![GATEWAY] = "Done"]
/\ UNCHANGED << gatewayInwardsOpen,
gatewayDeliveredFirmware >>
/\ UNCHANGED << clientAuthorised, clientViewingData,
interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware,
interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended,
clientIdTrusted,
serviceCloudDataReceived,
serviceCloudDataSnapshot,
gatewayFirmwareAckSent,
otFirmwareAckSent, otLatestData,
otDataSentToServiceCloud,
otDataSigned, otStorage,
otFirmwareStatus, otDataRedirected,
otDataTransmissionBlocked,
otInstalledFirmware,
otUsbUnauthorisedAccess,
cloudDataSent, clientFirmware,
clientData >>
GatewayAwaitingOT == /\ pc[GATEWAY] = "GatewayAwaitingOT"
/\ gatewayFirmwareAckSent' = TRUE
/\ pc' = [pc EXCEPT ![GATEWAY] = "Done"]
/\ UNCHANGED << clientAuthorised, clientViewingData,
interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware,
interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended,
clientIdTrusted, serviceCloudDataReceived,
serviceCloudDataSnapshot,
gatewayInwardsOpen,
gatewayDeliveredFirmware,
otFirmwareAckSent, otLatestData,
otDataSentToServiceCloud, otDataSigned,
otStorage, otFirmwareStatus,
otDataRedirected,
otDataTransmissionBlocked,
otInstalledFirmware,
otUsbUnauthorisedAccess, cloudDataSent,
clientFirmware, clientData >>
GatewayAwaitingFirmwareAck == /\ pc[GATEWAY] = "GatewayAwaitingFirmwareAck"
/\ otFirmwareAckSent
/\ pc' = [pc EXCEPT ![GATEWAY] = "GatewayAwaitingOT"]
/\ UNCHANGED << clientAuthorised,
clientViewingData,
interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware,
interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended,
clientIdTrusted,
serviceCloudDataReceived,
serviceCloudDataSnapshot,
gatewayInwardsOpen,
gatewayFirmwareAckSent,
gatewayDeliveredFirmware,
otFirmwareAckSent, otLatestData,
otDataSentToServiceCloud,
otDataSigned, otStorage,
otFirmwareStatus,
otDataRedirected,
otDataTransmissionBlocked,
otInstalledFirmware,
otUsbUnauthorisedAccess,
cloudDataSent, clientFirmware,
clientData >>
gateway == GatewayAwaitingFirmware \/ GatewayAwaitingOT
\/ GatewayAwaitingFirmwareAck
OTBegin == /\ pc[OT] = "OTBegin"
/\ TRUE
/\ pc' = [pc EXCEPT ![OT] = "OTSendData"]
/\ UNCHANGED << clientAuthorised, clientViewingData,
interactiveCloudCheckedId,
interactiveCloudDeliveredFirmware,
interactiveCloudFirmwareAckSent,
interactiveCloudLocationSuspended, clientIdTrusted,
serviceCloudDataReceived, serviceCloudDataSnapshot,
gatewayInwardsOpen, gatewayFirmwareAckSent,
gatewayDeliveredFirmware, otFirmwareAckSent,
otLatestData, otDataSentToServiceCloud,
otDataSigned, otStorage, otFirmwareStatus,
otDataRedirected, otDataTransmissionBlocked,
otInstalledFirmware, otUsbUnauthorisedAccess,