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added transferring the NMK from slac_match to set_key and fixed NMK typo

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uhi22 2022-10-17 08:48:26 +02:00
parent c51a5b6691
commit b93727f011
1 changed files with 28 additions and 7 deletions
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33
pyPlcHomeplug.py
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@ -83,6 +83,7 @@ MMTYPE_IND = 0x0002
MMTYPE_RSP = 0x0003
class pyPlcHomeplug():
def showIpAddresses(self, mybytearray):
addr = lambda pkt, offset: '.'.join(str(pkt[i]) for i in range(offset, offset + 4))
@ -133,10 +134,10 @@ class pyPlcHomeplug():
for i in range(0, len(self.mytransmitbuffer)):
self.mytransmitbuffer[i]=0
def setNwkAt(self, index):
# sets the Network Key (NMK) at a certain position in the transmit buffer
def setNmkAt(self, index):
# sets the Network Membership Key (NMK) at a certain position in the transmit buffer
for i in range(0, 16):
self.mytransmitbuffer[index+i]=self.NWK[i] # NWK
self.mytransmitbuffer[index+i]=self.NMK[i] # NMK
def setNidAt(self, index):
# (b0f2e695666b03 was NID of TPlink)
@ -208,7 +209,7 @@ class pyPlcHomeplug():
#self.setNidAt(33) # 14-20 nid 7 bytes from 33 to 39
self.mytransmitbuffer[40]=0x01 # 21 peks (payload encryption key select) Table 11-83. 01 is NMK. We had 02 here, why???
# with 0x0F we could choose "no key, payload is sent in the clear"
self.setNwkAt(41)
self.setNmkAt(41)
self.mytransmitbuffer[41]+=variation # to try different NMKs
# and three remaining zeros
@ -453,14 +454,34 @@ class pyPlcHomeplug():
s=s+hex(self.NID[i])+ " "
print("From GetKeyCnf, got network ID (NID) " + s)
def evaluateSlacMatchCnf(self):
# The SLAC_MATCH.CNF contains the NMK and the NID.
# We extract this information, so that we can use it for the CM_SET_KEY afterwards.
# References: https://github.com/qca/open-plc-utils/blob/master/slac/evse_cm_slac_match.c
# 2021-12-16_HPC_säule1_full_slac.pcapng
s = ""
for i in range(0, 7):
self.NID[i] = self.myreceivebuffer[85+i]
s=s+hex(self.NID[i])+ " "
print("From SlacMatchCnf, got network ID (NID) " + s)
s = ""
for i in range(0, 16):
self.NMK[i] = self.myreceivebuffer[93+i]
s=s+hex(self.NMK[i])+ " "
print("From SlacMatchCnf, got network membership key (NMK) " + s)
# use the extracted NMK and NID to set the key in the adaptor:
self.composeTestFrameSetKey(0)
self.addToTrace("transmitting CM_SET_KEY.REQ")
self.sniffer.sendpacket(bytes(self.mytransmitbuffer))
def evaluateReceivedHomeplugPacket(self):
mmt = self.getManagementMessageType()
print(hex(mmt))
if (mmt == CM_GET_KEY + MMTYPE_CNF):
self.evaluateGetKeyCnf()
if (mmt == CM_SLAC_MATCH + MMTYPE_CNF):
self.evaluateSlacMatchCnf()
#if (pkt[15]==0x64): #SLAC_Request
def findEthernetAdaptor(self):
self.strInterfaceName="eth0" # default, if the real is not found
@ -495,7 +516,7 @@ class pyPlcHomeplug():
self.findEthernetAdaptor()
self.sniffer = pcap.pcap(name=self.strInterfaceName, promisc=True, immediate=True, timeout_ms=50)
self.sniffer.setnonblock(True)
self.NWK = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 ] # a default network key
self.NMK = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 ] # a default network key
self.NID = [ 1, 2, 3, 4, 5, 6, 7 ] # a default network ID
self.runningCounter=0
print("sniffer created at " + self.strInterfaceName)