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EVSE.py
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EVSE.py
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"""
Copyright 2023, Battelle Energy Alliance, LLC, ALL RIGHTS RESERVED
This class is used to emulate a EVSE when talking to an PEV. Handles level 2 SLAC communications
and level 3 UDP and TCP communications to the electric vehicle.
"""
# need to do this to import the custom SECC and V2G scapy layer
import sys, os
sys.path.append("./external_libs/HomePlugPWN")
sys.path.append("./external_libs/V2GInjector/core")
from threading import Thread
from layers.SECC import *
from layers.V2G import *
from layerscapy.HomePlugGP import *
from XMLBuilder import XMLBuilder
from EXIProcessor import EXIProcessor
from EmulatorEnum import *
from NMAPScanner import NMAPScanner
import xml.etree.ElementTree as ET
import binascii
from smbus import SMBus
import argparse
class EVSE:
def __init__(self, args):
self.mode = RunMode(args.mode[0]) if args.mode else RunMode.FULL
self.iface = args.interface[0] if args.interface else "eth1"
self.sourceMAC = args.source_mac[0] if args.source_mac else "00:1e:c0:f2:6c:a0"
self.sourceIP = args.source_ip[0] if args.source_ip else "fe80::21e:c0ff:fef2:6ca0"
self.sourcePort = args.source_port[0] if args.source_port else 25565
self.NID = args.NID[0] if args.NID else b"\x9c\xb0\xb2\xbb\xf5\x6c\x0e"
self.NMK = args.NMK[0] if args.NMK else b"\x48\xfe\x56\x02\xdb\xac\xcd\xe5\x1e\xda\xdc\x3e\x08\x1a\x52\xd1"
self.protocol = Protocol(args.protocol[0]) if args.protocol else Protocol.DIN
self.nmapMAC = args.nmap_mac[0] if args.nmap_mac else ""
self.nmapIP = args.nmap_ip[0] if args.nmap_ip else ""
self.nmapPorts = []
if args.nmap_ports:
for arg in args.nmap_port[0].split(','):
if "-" in arg:
i1,i2 = arg.split("-")
for i in range(int(i1), int(i2)+1):
self.nmapPorts.append(i)
else:
self.nmapPorts.append(int(arg))
if args.modified_cordset:
self.modified_cordset = True
else:
self.modified_cordset = False
self.destinationMAC = None
self.destinationIP = None
self.destinationPort = None
self.exi = EXIProcessor(self.protocol)
self.slac = _SLACHandler(self)
self.tcp = _TCPHandler(self)
# I2C bus for relays
self.bus = SMBus(1)
# Constants for i2c controlled relays
self.I2C_ADDR = 0x20
self.CONTROL_REG = 0x9
self.EVSE_CP = 0b1
self.EVSE_PP = 0b1000
self.ALL_OFF = 0b0
# Start the emulator
def start(self):
# Initialize the I2C bus for wwrite
self.bus.write_byte_data(self.I2C_ADDR, 0x00, 0x00)
self.toggleProximity()
self.doSLAC()
self.doTCP()
# If NMAP is not done, restart connection
if not self.tcp.finishedNMAP:
print("INFO (EVSE): Attempting to restart connection...")
self.start()
# Close the circuit for the proximity pins
def closeProximity(self):
if self.modified_cordset:
print("INFO (EVSE): Closing CP/PP relay connections")
self.bus.write_byte_data(self.I2C_ADDR, self.CONTROL_REG, self.EVSE_PP | self.EVSE_CP)
else:
print("INFO (EVSE): Closing CP relay connection")
self.bus.write_byte_data(self.I2C_ADDR, self.CONTROL_REG, self.EVSE_CP)
# Close the circuit for the proximity pins
def openProximity(self):
print("INFO (EVSE): Opening CP/PP relay connections")
self.bus.write_byte_data(self.I2C_ADDR, self.CONTROL_REG, self.ALL_OFF)
# Opens and closes proximity circuit with a delay
def toggleProximity(self, t: int = 5):
self.openProximity()
time.sleep(t)
self.closeProximity()
# Starts TCP/IPv6 thread that handles layer 3 comms
def doTCP(self):
self.tcp.start()
print("INFO (EVSE): Done TCP")
# Starts SLAC thread that handles layer 2 comms
def doSLAC(self):
self.slac.start()
self.slac.sniffThread.join()
print("INFO (EVSE): Done SLAC")
# Handles all SLAC communications
class _SLACHandler:
def __init__(self, evse: EVSE):
self.evse = evse
self.iface = self.evse.iface
self.sourceMAC = self.evse.sourceMAC
self.sourceIP = self.evse.sourceIP
self.sourcePort = self.evse.sourcePort
self.NID = self.evse.NID
self.NMK = self.evse.NMK
self.timeout = 8
self.stop = False
# Starts SLAC process
def start(self):
self.stop = False
print("INFO (EVSE): Sending SET_KEY_REQ")
sendp(self.buildSetKey(), iface=self.iface, verbose=0)
self.sniffThread = Thread(target=self.startSniff)
self.sniffThread.start()
self.timeoutThread = Thread(target=self.checkForTimeout)
self.timeoutThread.start()
def checkForTimeout(self):
self.lastMessageTime = time.time()
while True:
if self.stop:
break
if time.time() - self.lastMessageTime > self.timeout:
print("INFO (EVSE): SLAC timed out, resetting connection...")
self.evse.toggleProximity()
self.lastMessageTime = time.time()
def startSniff(self):
sniff(iface=self.iface, prn=self.handlePacket, stop_filter=self.stopSniff)
def stopSniff(self, pkt):
if pkt.haslayer("SECC_RequestMessage"):
print("INDO (EVSE): Recieved SECC_RequestMessage")
# self.evse.destinationMAC = pkt[Ether].src
# use this to send 3 secc responses incase car doesnt see one
self.destinationIP = pkt[IPv6].src
self.destinationPort = pkt[UDP].sport
Thread(target=self.sendSECCResponse).start()
self.stop = True
return self.stop
def sendSECCResponse(self):
time.sleep(0.2)
for i in range(3):
print("INFO (EVSE): Sending SECC_ResponseMessage")
sendp(self.buildSECCResponse(), iface=self.iface, verbose=0)
def handlePacket(self, pkt):
if pkt[Ether].type != 0x88E1 or pkt[Ether].src == self.sourceMAC:
return
self.lastMessageTime = time.time()
if pkt.haslayer("CM_SLAC_PARM_REQ"):
print("INFO (EVSE): Recieved SLAC_PARM_REQ")
self.destinationMAC = pkt[Ether].src
self.runID = pkt[CM_SLAC_PARM_REQ].RunID
print("INFO (EVSE): Sending CM_SLAC_PARM_CNF")
sendp(self.buildSlacParmCnf(), iface=self.iface, verbose=0)
if pkt.haslayer("CM_MNBC_SOUND_IND") and pkt[CM_MNBC_SOUND_IND].Countdown == 0:
print("INFO (EVSE): Recieved last MNBC_SOUND_IND")
print("INFO (EVSE): Sending ATTEN_CHAR_IND")
sendp(self.buildAttenCharInd(), iface=self.iface, verbose=0)
if pkt.haslayer("CM_SLAC_MATCH_REQ"):
print("INFO (EVSE): Recieved SLAC_MATCH_REQ")
print("INFO (EVSE): Sending SLAC_MATCH_CNF")
sendp(self.buildSlacMatchCnf(), iface=self.iface, verbose=0)
def buildSlacParmCnf(self):
ethLayer = Ether()
ethLayer.src = self.sourceMAC
ethLayer.dst = self.destinationMAC
homePlugAVLayer = HomePlugAV()
homePlugAVLayer.version = 0x01
# Parameters copied from packet #13 in BMW-i3-Plugin-ChargeStart-UserStop.pcapng
homePlugLayer = CM_SLAC_PARM_CNF()
homePlugLayer.MSoundTargetMAC = "ff:ff:ff:ff:ff:ff"
homePlugLayer.NumberMSounds = 0x0A
homePlugLayer.TimeOut = 0x06
homePlugLayer.ResponseType = 0x01
homePlugLayer.ForwardingSTA = self.destinationMAC
homePlugLayer.RunID = self.runID
# padding?
rawLayer = Raw()
rawLayer.load = b"\x00" * 16
responsePacket = ethLayer / homePlugAVLayer / homePlugLayer / rawLayer
return responsePacket
def buildAttenCharInd(self):
ethLayer = Ether()
ethLayer.src = self.sourceMAC
ethLayer.dst = self.destinationMAC
homePlugAVLayer = HomePlugAV()
homePlugAVLayer.version = 0x01
# Parameters copied from packet #29 in BMW-i3-Plugin-ChargeStart-UserStop.pcapng
homePlugLayer = CM_ATTEN_CHAR_IND()
homePlugLayer.ApplicationType = 0x00
homePlugLayer.SecurityType = 0x00
homePlugLayer.SourceAdress = self.destinationMAC
homePlugLayer.RunID = self.runID
homePlugLayer.NumberOfSounds = 0x0A
# TODO: deal with number of groups and average attenuations
# Does the number of groups change?
homePlugLayer.NumberOfGroups = 58
attens = [
26,
25,
26,
28,
25,
27,
34,
33,
33,
36,
31,
31,
31,
31,
30,
29,
29,
28,
27,
26,
25,
23,
22,
22,
21,
20,
24,
27,
31,
36,
41,
45,
45,
38,
32,
29,
29,
31,
32,
32,
32,
34,
35,
35,
35,
35,
35,
35,
34,
38,
39,
39,
40,
40,
39,
41,
42,
57,
]
groups = []
for e in attens:
g = HPGP_GROUP()
g.group = e
groups.append(g)
homePlugLayer.Groups = groups
responsePacket = ethLayer / homePlugAVLayer / homePlugLayer
return responsePacket
def buildSlacMatchCnf(self):
ethLayer = Ether()
ethLayer.src = self.sourceMAC
ethLayer.dst = self.destinationMAC
homePlugAVLayer = HomePlugAV()
homePlugAVLayer.version = 0x01
slacVars = SLAC_varfield_cnf()
slacVars.EVMAC = self.destinationMAC
slacVars.EVSEMAC = self.sourceMAC
slacVars.RunID = self.runID
slacVars.NetworkID = self.NID
slacVars.NMK = self.NMK
homePlugLayer = CM_SLAC_MATCH_CNF()
homePlugLayer.MatchVariableFieldLen = 0x5600
homePlugLayer.VariableField = slacVars
responsePacket = ethLayer / homePlugAVLayer / homePlugLayer
return responsePacket
def buildSetKey(self):
ethLayer = Ether()
ethLayer.src = self.sourceMAC
ethLayer.dst = "00:b0:52:00:00:01" # Some AtherosC MAC for some reason
homePlugAVLayer = HomePlugAV()
homePlugAVLayer.version = 0x01
homePlugLayer = CM_SET_KEY_REQ()
homePlugLayer.KeyType = 0x1
homePlugLayer.MyNonce = 0xAAAAAAAA
homePlugLayer.YourNonce = 0x00000000
homePlugLayer.PID = 0x4
homePlugLayer.NetworkID = self.NID
homePlugLayer.NewEncKeySelect = 0x1
homePlugLayer.NewKey = self.NMK
responsePacket = ethLayer / homePlugAVLayer / homePlugLayer
return responsePacket
def buildSECCResponse(self):
e = Ether()
e.src = self.sourceMAC
e.dst = self.destinationMAC
ip = IPv6()
ip.src = self.sourceIP
ip.dst = self.destinationIP
udp = UDP()
udp.sport = 15118
udp.dport = self.destinationPort
secc = SECC()
secc.SECCType = 0x9001
secc.PayloadLen = 20
seccRM = SECC_ResponseMessage()
seccRM.SecurityProtocol = 16
seccRM.TargetPort = self.sourcePort
seccRM.TargetAddress = self.sourceIP # eno1
responsePacket = e / ip / udp / secc / seccRM
return responsePacket
class _TCPHandler:
def __init__(self, evse: EVSE):
self.evse = evse
self.iface = self.evse.iface
self.sourceMAC = self.evse.sourceMAC
self.sourceIP = self.evse.sourceIP
self.sourcePort = self.evse.sourcePort
self.destinationMAC = self.evse.destinationMAC
self.destinationIP = self.evse.destinationIP
self.destinationPort = self.evse.destinationPort
self.seq = 10000
self.ack = 0
self.exi = self.evse.exi
self.xml = XMLBuilder(self.exi)
self.msgList = {}
self.stop = False
self.scanner = None
self.timeout = 5
def start(self):
self.msgList = {}
self.running = True
print("INFO (EVSE): Starting TCP")
self.startSniff = False
self.recvThread = AsyncSniffer(
iface=self.iface,
lfilter=lambda x: x.haslayer("TCP") and x[TCP].sport == self.destinationPort and x[TCP].dport == self.sourcePort,
prn=self.handlePacket,
started_callback=self.setStartSniff,
)
self.recvThread.start()
while not self.startSniff:
continue
self.handshakeThread = AsyncSniffer(
count=1, iface=self.iface, lfilter=lambda x: x.haslayer("IPv6") and x.haslayer("TCP") and x[TCP].flags == "S", prn=self.handshake
)
self.handshakeThread.start()
self.neighborSolicitationThread = AsyncSniffer(
iface=self.iface, lfilter=lambda x: x.haslayer("ICMPv6ND_NS") and x[ICMPv6ND_NS].tgt == self.sourceIP, prn=self.sendNeighborSoliciation
)
self.neighborSolicitationThread.start()
self.timeoutThread = Thread(target=self.checkForTimeout)
self.timeoutThread.start()
while self.running:
time.sleep(1)
def checkForTimeout(self):
print("INFO (EVSE): Starting timeout thread")
self.lastMessageTime = time.time()
while True:
# if self.stop: break
if time.time() - self.lastMessageTime > self.timeout or self.running == False:
print("INFO (EVSE): TCP timed out, resetting connection...")
self.killThreads()
break
time.sleep(1)
# Need this so the sniff thread is actually running when the handshake is sent
def setStartSniff(self):
self.startSniff = True
# print("INFO (EVSE): Starting recv sniff")
def recv(self):
print("EVSE (INFO): Starting recv thread")
sniff(
iface=self.iface,
lfilter=lambda x: x.haslayer("TCP") and x[TCP].sport == self.destinationPort and x[TCP].dport == self.sourcePort,
prn=self.handlePacket,
started_callback=self.setStartSniff,
)
def fin(self):
print("INFO (EVSE): Recieved FIN")
self.running = False
self.ack = self.ack + 1
ethLayer = Ether()
ethLayer.src = self.sourceMAC
ethLayer.dst = self.destinationMAC
ipLayer = IPv6()
ipLayer.src = self.sourceIP
ipLayer.dst = self.destinationIP
tcpLayer = TCP()
tcpLayer.sport = self.sourcePort
tcpLayer.dport = self.destinationPort
tcpLayer.flags = "A"
tcpLayer.seq = self.seq
tcpLayer.ack = self.ack
ack = ethLayer / ipLayer / tcpLayer
sendp(ack, iface=self.iface, verbose=0)
tcpLayer.flags = "FA"
finAck = ethLayer / ipLayer / tcpLayer
print("INFO (EVSE): Sending FINACK")
sendp(finAck, iface=self.iface, verbose=0)
def killThreads(self):
print("INFO (EVSE): Killing sniffing threads")
self.running = False
if self.scanner:
self.scanner.stop()
if self.recvThread.running:
self.recvThread.stop()
if self.handshakeThread.running:
self.handshakeThread.stop()
if self.neighborSolicitationThread.running:
self.neighborSolicitationThread.stop()
def handlePacket(self, pkt):
self.last_recv = pkt
self.seq = self.last_recv[TCP].ack
self.ack = self.last_recv[TCP].seq + len(self.last_recv[TCP].payload)
if "F" in self.last_recv.flags:
self.fin()
return
if "P" not in self.last_recv.flags:
return
self.lastMessageTime = time.time()
data = self.last_recv[Raw].load
v2g = V2GTP(data)
payload = v2g.Payload
# Save responses to decrease load on java webserver
if payload in self.msgList.keys():
exi = self.msgList[payload]
else:
exi = self.getEXIFromPayload(payload)
if exi == None:
return
self.msgList[payload] = exi
sendp(self.buildV2G(binascii.unhexlify(exi)), iface=self.iface, verbose=0)
def buildV2G(self, payload):
ethLayer = Ether()
ethLayer.src = self.sourceMAC
ethLayer.dst = self.destinationMAC
ipLayer = IPv6()
ipLayer.src = self.sourceIP
ipLayer.dst = self.destinationIP
tcpLayer = TCP()
tcpLayer.sport = self.sourcePort
tcpLayer.dport = self.destinationPort
tcpLayer.seq = self.seq
tcpLayer.ack = self.ack
tcpLayer.flags = "PA"
v2gLayer = V2GTP()
v2gLayer.PayloadLen = len(payload)
v2gLayer.Payload = payload
return ethLayer / ipLayer / tcpLayer / v2gLayer
def getEXIFromPayload(self, data):
data = binascii.hexlify(data)
xmlString = self.exi.decode(data)
# print(f"XML String: {xmlString}")
root = ET.fromstring(xmlString)
if root.text is None:
if root[0].tag == "AppProtocol":
self.xml.SupportedAppProtocolResponse()
return self.xml.getEXI()
name = root[1][0].tag
print(f"Request: {name}")
if "SessionSetupReq" in name:
self.xml.SessionSetupResponse()
elif "ServiceDiscoveryReq" in name:
self.xml.ServiceDiscoveryResponse()
elif "ServicePaymentSelectionReq" in name:
self.xml.ServicePaymentSelectionResponse()
elif "ContractAuthenticationReq" in name:
self.xml.ContractAuthenticationResponse()
if self.evse.mode == RunMode.STOP:
self.xml.EVSEProcessing.text = "Ongoing"
elif self.evse.mode == RunMode.SCAN:
self.xml.EVSEProcessing.text = "Ongoing"
# Start nmap scan while connection is kept alive
if self.scanner == None:
nmapMAC = self.evse.nmapMAC if self.evse.nmapMAC else self.destinationMAC
nmapIP = self.evse.nmapIP if self.evse.nmapIP else self.destinationIP
self.scanner = NMAPScanner(EmulatorType.EVSE, self.evse.nmapPorts, self.iface, self.sourceMAC, self.sourceIP, nmapMAC, nmapIP)
self.scanner.start()
elif "ChargeParameterDiscoveryReq" in name:
self.xml.ChargeParameterDiscoveryResponse()
# self.xml.MinCurrentLimitValue.text = "0"
self.xml.MaxCurrentLimitValue.text = "5"
elif "CableCheckReq" in name:
self.xml.CableCheckResponse()
elif "PreChargeReq" in name:
self.xml.PreChargeResponse()
self.xml.Multiplier.text = root[1][0][1][0].text
self.xml.Value.text = root[1][0][1][2].text
elif "PowerDeliveryReq" in name:
self.xml.PowerDeliveryResponse()
elif "CurrentDemandReq" in name:
self.xml.CurrentDemandResponse()
self.xml.CurrentMultiplier.text = root[1][0][1][0].text
self.xml.CurrentValue.text = root[1][0][1][2].text
self.xml.VoltageMultiplier.text = root[1][0][8][0].text
self.xml.VoltageValue.text = root[1][0][8][2].text
self.xml.CurrentLimitValue.text = "5"
elif "SessionStopReq" in name:
self.running = False
self.xml.SessionStopResponse()
else:
raise Exception(f'Packet type "{name}" not recognized')
return self.xml.getEXI()
def startNeighborSolicitationSniff(self):
sniff(iface=self.iface, prn=self.sendNeighborSoliciation)
def sendNeighborSoliciation(self, pkt):
# if self.stop: exit()
# if not (pkt.haslayer("ICMPv6ND_NS") and pkt[ICMPv6ND_NS].tgt == self.sourceIP): return
self.destinationMAC = pkt[Ether].src
self.destinationIP = pkt[IPv6].src
# print("INFO (EVSE): Sending Neighor Advertisement")
sendp(self.buildNeighborAdvertisement(), iface=self.iface, verbose=0)
def handshake(self, syn):
self.destinationMAC = syn[Ether].src
self.destinationIP = syn[IPv6].src
self.destinationPort = syn[TCP].sport
self.ack = syn[TCP].seq + 1
ethLayer = Ether()
ethLayer.src = self.sourceMAC
ethLayer.dst = self.destinationMAC
ipLayer = IPv6()
ipLayer.src = self.sourceIP
ipLayer.dst = self.destinationIP
tcpLayer = TCP()
tcpLayer.sport = self.sourcePort
tcpLayer.dport = self.destinationPort
tcpLayer.flags = "SA"
tcpLayer.seq = self.seq
tcpLayer.ack = self.ack
synAck = ethLayer / ipLayer / tcpLayer
print("INFO (EVSE): Sending SYNACK")
sendp(synAck, iface=self.iface, verbose=0)
def buildNeighborAdvertisement(self):
ethLayer = Ether()
ethLayer.src = self.sourceMAC
ethLayer.dst = self.destinationMAC
ipLayer = IPv6()
ipLayer.src = self.sourceIP
ipLayer.dst = self.destinationIP
ipLayer.plen = 32
ipLayer.hlim = 255
icmpLayer = ICMPv6ND_NA()
icmpLayer.type = 136
icmpLayer.R = 0
icmpLayer.S = 1
icmpLayer.tgt = self.sourceIP
optLayer = ICMPv6NDOptDstLLAddr()
optLayer.type = 2
optLayer.len = 1
optLayer.lladdr = self.sourceMAC
responsePacket = ethLayer / ipLayer / icmpLayer / optLayer
return responsePacket
if __name__ == "__main__":
# Parse arguements from command line
parser = argparse.ArgumentParser(description="EVSE emulator for AcCCS")
parser.add_argument(
"-M",
"--mode",
nargs=1,
type=int,
help="Mode for emulator to run in: 0 for full conversation, 1 for stalling the conversation, 2 for portscanning (default: 0)",
)
parser.add_argument("-I", "--interface", nargs=1, help="Ethernet interface to send/recieve packets on (default: eth1)")
parser.add_argument("--source-mac", nargs=1, help="Source MAC address of packets (default: 00:1e:c0:f2:6c:a0)")
parser.add_argument("--source-ip", nargs=1, help="Source IP address of packets (default: fe80::21e:c0ff:fef2:72f3)")
parser.add_argument("--source-port", nargs=1, type=int, help="Source port of packets (default: 25565)")
parser.add_argument("--NID", nargs=1, help="Network ID of the HomePlug GreenPHY AVLN (default: \\x9c\\xb0\\xb2\\xbb\\xf5\\x6c\\x0e)")
parser.add_argument(
"--NMK",
nargs=1,
help="Network Membership Key of the HomePlug GreenPHY AVLN (default: \\x48\\xfe\\x56\\x02\\xdb\\xac\\xcd\\xe5\\x1e\\xda\\xdc\\x3e\\x08\\x1a\\x52\\xd1)",
)
parser.add_argument("-p", "--protocol", nargs=1, help="Protocol for EXI encoding/decoding: DIN, ISO-2, ISO-20 (default: DIN)")
parser.add_argument("--nmap-mac", nargs=1, help="The MAC address of the target device to NMAP scan (default: EVCC MAC address)")
parser.add_argument("--nmap-ip", nargs=1, help="The IP address of the target device to NMAP scan (default: EVCC IP address)")
parser.add_argument("--nmap-ports", nargs=1, help="List of ports to scan seperated by commas (ex. 1,2,5-10,19,...) (default: Top 8000 common ports)")
parser.add_argument("--modified-cordset", action="store_true", help="Set this option when using a modified cordset during testing of a target vehicle. The AcCCS system will provide a 150 ohm ground on the proximity line to reset the connection. (default: False)")
args = parser.parse_args()
evse = EVSE(args)
try:
evse.start()
except KeyboardInterrupt:
print("INFO (EVSE): Shutting down emulator")
except Exception as e:
print(e)
finally:
evse.openProximity()
del evse