def __security_seed_wrapper(args):
"""Wrapper used to initiate security seed dump"""
arb_id_request = args.src
arb_id_response = args.dst
reset_type = args.reset
session_type = args.sess_type
level = args.sec_level
num_seeds = args.num
reset_delay = args.delay
seed_list = []
try:
print("Security seed dump started. Press Ctrl+C to stop.\n")
while num_seeds > len(seed_list) or num_seeds == 0:
# Extended diagnostics
response = extended_session(arb_id_request, arb_id_response,
session_type)
if not Iso14229_1.is_positive_response(response):
print("Unable to enter extended session. Retrying...\n")
continue
# Request seed
response = request_seed(arb_id_request, arb_id_response, level,
None, None)
if response is None:
print("\nInvalid response")
elif Iso14229_1.is_positive_response(response):
seed_list.append(list_to_hex_str(response[2:]))
print("Seed received: {}\t(Total captured: {})".format(
list_to_hex_str(response[2:]), len(seed_list)),
end="\r")
stdout.flush()
else:
print_negative_response(response)
break
if reset_type:
ecu_reset(arb_id_request, arb_id_response, reset_type, None)
time.sleep(reset_delay)
except KeyboardInterrupt:
print("Interrupted by user.")
except ValueError as e:
print(e)
return
if len(seed_list) > 0:
print("\n")
print("Security Access Seeds captured:")
for seed in seed_list:
print(seed)
def __ecu_reset_wrapper(args):
"""Wrapper used to initiate ECU Reset"""
arb_id_request = args.src
arb_id_response = args.dst
reset_type = args.reset_type
timeout = args.timeout
print(
"Sending ECU reset, type 0x{0:02x} to arbitration ID {1} (0x{1:02x})".
format(reset_type, arb_id_request))
try:
response = ecu_reset(arb_id_request, arb_id_response, reset_type,
timeout)
except ValueError as e:
print("ValueError: {0}".format(e))
return
# Decode response
if response is None:
print("No response was received")
else:
response_length = len(response)
if response_length == 0:
# Empty response
print("Received empty response")
elif response_length == 1:
# Invalid response length
print(
"Received response [{0:02x}] (1 byte), expected at least 2 bytes"
.format(response[0], len(response)))
elif Iso14229_1.is_positive_response(response):
# Positive response handling
response_service_id = response[0]
subfunction = response[1]
expected_response_id = Iso14229_1.get_service_response_id(
Services.EcuReset.service_id)
if response_service_id == expected_response_id and subfunction == reset_type:
# Positive response
print("Received positive response")
if response_length > 2:
# Additional data can be seconds left to reset (powerDownTime) or manufacturer specific
additional_data = list_to_hex_str(response[2:], ",")
print("Response contains additional data: [{0}]".format(
additional_data))
else:
# Service and/or subfunction mismatch
print(
"Response service ID 0x{0:02x} and subfunction 0x{1:02x} do not match expected values "
"0x{2:02x} and 0x{3:02x}".format(response_service_id,
subfunction,
expected_response_id,
reset_type))
else:
# Negative response handling
nrc = response[1]
nrc_description = NRC_NAMES.get(nrc, "Unknown NRC value")
print(
"Received negative response code (NRC) 0x{0:02x}: {1}".format(
nrc, nrc_description))
def directive_str(arb_id, data):
"""
Converts a directive to its string representation
:param arb_id: message arbitration ID
:param data: message data bytes
:return: str representing directive
"""
data = list_to_hex_str(data, "")
directive = "{0:03X}#{1}".format(arb_id, data)
return directive
def handle_upload_reply(msg):
global byte_counter, bytes_left, dump_complete, timeout_start, segment_counter
if msg.arbitration_id != rcv_arb_id:
return
if msg.data[0] == 0xfe:
decode_xcp_error(msg)
return
if msg.data[0] == 0xff:
# Reset timeout timer
timeout_start = datetime.now()
# Calculate end index of data to handle
end_index = min(8, bytes_left + 1)
if dump_file:
with open(dump_file, "ab") as outfile:
outfile.write(bytearray(msg.data[1:end_index]))
else:
print(list_to_hex_str(msg.data[1:end_index], " "))
# Update counters
byte_counter += max_segment_size
bytes_left -= max_segment_size
if bytes_left < 1:
if dump_file:
print("\rDumping segment {0} ({1} b, 0 b left)".format(
segment_counter, length),
end="")
print("Dump complete!")
dump_complete = True
elif byte_counter > max_segment_size - 1:
# Dump another segment
segment_counter += 1
if dump_file:
# Print progress
print("\rDumping segment {0} ({1} b, {2} b left)".format(
segment_counter,
((segment_counter + 1) * max_segment_size +
byte_counter), bytes_left),
end="")
stdout.flush()
byte_counter = 0
can_wrap.send_single_message_with_callback(
[0xf5, min(max_segment_size, bytes_left)],
handle_upload_reply)
def send_messages(messages, loop):
"""
Sends a list of messages separated by a given delay.
:param loop: bool indicating whether the message sequence should be looped (re-sent over and over)
:param messages: List of messages, where a message has the format (arb_id, [data_byte])
"""
with CanActions(notifier_enabled=False) as can_wrap:
loop_counter = 0
while True:
for i in range(len(messages)):
msg = messages[i]
if i != 0 or loop_counter != 0:
sleep(msg.delay)
print(" Arb_id: 0x{0:08x}, data: {1}".format(msg.arb_id, list_to_hex_str(msg.data, ".")))
can_wrap.send(msg.data, msg.arb_id, msg.is_extended, msg.is_error, msg.is_remote)
if not loop:
break
loop_counter += 1
def do_stuff(my_arbitration_id):
"""
Performs some example operations, such as sending and receiving CAN messages.
:param my_arbitration_id: The default arbitration id to use when sending messages
:type my_arbitration_id: int
"""
# The notifier should only be enabled when handling incoming traffic using callbacks
use_notifier = False
# Setup CanActions wrapper to use for receiving and sending messages
with CanActions(arb_id=my_arbitration_id,
notifier_enabled=use_notifier) as can_wrap:
# Define message contents
my_message = [0x11, 0x22, 0x33, 0x44]
# Send message using the default arbitration ID for can_wrap
can_wrap.send(data=my_message)
# Send the same message again, but on a custom arbitration ID this time
my_custom_arbitration_id = 0x123ABC
can_wrap.send(data=my_message, arb_id=my_custom_arbitration_id)
# Listen for incoming traffic for a while
duration_seconds = 1.0
start_time = time.time()
end_time = start_time + duration_seconds
while time.time() < end_time:
# Check if a message is available
msg = can_wrap.bus.recv(0)
if msg is None:
# No message was available right now - continue listening loop
continue
# If we reach here, a message was received. Let's print it!
print("Received a message on channel", msg.channel)
print(" Arb ID: 0x{0:x} ({0})".format(msg.arbitration_id))
data_string = list_to_hex_str(msg.data, ".")
print(" Data: ", data_string)
# Module logic for message handling goes here
if msg.arbitration_id < 0x10:
print(" That was a low arbitration ID!")
# When we reach here, can_wrap has been closed
print("\nDone!")
def mutate_fuzz(initial_arb_id,
initial_data,
arb_id_bitmap,
data_bitmap,
filename=None,
show_status=True,
show_responses=False,
seed=None):
"""
Performs mutation based fuzzing of selected nibbles of a given arbitration ID and data.
Nibble selection is controlled by bool lists 'arb_id_bitmap' and 'data_bitmap'.
:param initial_arb_id: list of nibbles (ints in interval 0x0-0xF, inclusive)
:param initial_data: list of nibbles (ints in interval 0x0-0xF, inclusive)
:param arb_id_bitmap: list of bool values, representing which nibbles of 'initial_arb_id' to bruteforce
:param data_bitmap: list of bool values, representing which nibbles of 'initial_data' to bruteforce
:param filename: file to write cansend directives to
:param show_status: bool indicating whether current message and counter should be printed to stdout
:param show_responses: bool indicating whether responses should be printed to stdout
:param seed: use given seed instead of random seed
"""
# Seed handling
set_seed(seed)
def response_handler(msg):
# Callback handler for printing incoming messages
if msg.arbitration_id != arb_id or list(msg.data) != data:
response_directive = directive_str(msg.arbitration_id, msg.data)
print(" Received {0}".format(response_directive))
number_of_nibbles_to_fuzz_arb_id = sum(arb_id_bitmap)
number_of_nibbles_to_fuzz_data = sum(data_bitmap)
file_logging_enabled = filename is not None
output_file = None
# Set initial values - needed in case they are static
data = None
arb_id = None
if number_of_nibbles_to_fuzz_data == 0:
data = apply_fuzzed_data(initial_data, [], data_bitmap)
if number_of_nibbles_to_fuzz_arb_id == 0:
arb_id = int_from_byte_list(
apply_fuzzed_data(initial_arb_id, [], arb_id_bitmap))
try:
if file_logging_enabled:
output_file = open(filename, "a")
with CanActions() as can_wrap:
if show_responses:
can_wrap.add_listener(response_handler)
message_count = 0
while True:
if number_of_nibbles_to_fuzz_arb_id > 0:
# Mutate arbitration ID
fuzzed_nibbles_arb_id = [
random.randint(0, 0xF)
for _ in range(number_of_nibbles_to_fuzz_arb_id)
]
arb_id_bytes = apply_fuzzed_data(initial_arb_id,
fuzzed_nibbles_arb_id,
arb_id_bitmap)
arb_id = int_from_byte_list(arb_id_bytes)
if number_of_nibbles_to_fuzz_data > 0:
# Mutate data
fuzzed_nibbles_data = [
random.randint(0, 0xF)
for _ in range(number_of_nibbles_to_fuzz_data)
]
data = apply_fuzzed_data(initial_data, fuzzed_nibbles_data,
data_bitmap)
if show_status:
print("\rSending {0:04x} # {1} ({2})".format(
arb_id, list_to_hex_str(data, " "), message_count),
end="")
stdout.flush()
can_wrap.send(data, arb_id)
message_count += 1
# Log to file
if file_logging_enabled:
write_directive_to_file_handle(output_file, arb_id, data)
sleep(DELAY_BETWEEN_MESSAGES)
except KeyboardInterrupt:
if show_status:
print()
finally:
if output_file is not None:
output_file.close()
def bruteforce_fuzz(arb_id,
initial_data,
data_bitmap,
filename=None,
start_index=0,
show_progress=True,
show_responses=True):
"""
Performs a brute force of selected data nibbles for a given arbitration ID.
Nibble selection is controlled by bool list 'data_bitmap'.
Example:
bruteforce_fuzz(0x123, [0x1, 0x2, 0xA, 0xB], [True, False, False, True])
will cause the following messages to be sent:
0x123#02A0
0x123#02A1
0x123#02A2
(...)
0x123#02AF
0x123#12A0
0x123#12A1
(...)
0x123#F2AF
:param arb_id: int arbitration ID
:param initial_data: list of nibbles (ints in interval 0x0-0xF, inclusive)
:param data_bitmap: list of bool values, representing which nibbles of 'initial_data' to bruteforce
:param filename: file to write cansend directives to
:param start_index: int index to start at (can be used to resume interrupted session)
:param show_progress: bool indicating whether progress should be printed to stdout
:param show_responses: bool indicating whether responses should be printed to stdout
"""
# Sanity checks
if not 2 <= len(initial_data) <= 16:
raise ValueError(
"Invalid initial data: must be between 2 and 16 nibbles")
if not len(initial_data) % 2 == 0:
raise ValueError("Invalid initial data: must have an even length")
if not len(initial_data) == len(data_bitmap):
raise ValueError(
"Initial data ({0}) and data bitmap ({1}) must have the same length"
.format(len(initial_data), len(data_bitmap)))
number_of_nibbles_to_bruteforce = sum(data_bitmap)
end_index = 16**number_of_nibbles_to_bruteforce
if not 0 <= start_index <= end_index:
raise ValueError(
"Invalid start index '{0}', current range is [0-{1}]".format(
start_index, end_index))
def response_handler(msg):
# Callback handler for printing incoming messages
if msg.arbitration_id != arb_id or list(msg.data) != output_data:
response_directive = directive_str(msg.arbitration_id, msg.data)
print(" Received {0}".format(response_directive))
# Initialize fuzzed nibble generator
nibble_values = range(0xF + 1)
fuzz_data = product(nibble_values, repeat=number_of_nibbles_to_bruteforce)
file_logging_enabled = filename is not None
output_file = None
output_data = []
try:
if file_logging_enabled:
output_file = open(filename, "a")
with CanActions(arb_id=arb_id) as can_wrap:
if show_progress:
print("Starting at index {0} of {1}\n".format(
start_index, end_index))
if show_responses:
can_wrap.add_listener(response_handler)
message_count = 0
# Traverse all outputs from fuzz generator
for current_fuzzed_nibbles in fuzz_data:
# Skip handling until start_index is met
if message_count < start_index:
message_count += 1
continue
# Apply fuzzed data
output_data = apply_fuzzed_data(initial_data,
current_fuzzed_nibbles,
data_bitmap)
# Send message
can_wrap.send(output_data)
message_count += 1
if show_progress:
print("\rCurrent: {0} Index: {1}".format(
list_to_hex_str(output_data, " "), message_count),
end="")
stdout.flush()
# Log to file
if file_logging_enabled:
write_directive_to_file_handle(output_file, arb_id,
output_data)
sleep(DELAY_BETWEEN_MESSAGES)
if show_progress:
print()
finally:
if output_file is not None:
output_file.close()
if show_progress:
print("Brute force finished")
def print_msg_as_text(msg):
print(list_to_hex_str(msg.data[1:], ""))
def __str__(self):
return "[{0}]".format(list_to_hex_str(self.message_data, ", "))