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perf: use defined compiled regex

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re.compile(regex) definition was not used
use compile_regex.findAll() directely instead of re.findall(regex)
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osagit 2021-05-07 14:24:41 +02:00 committed by GitHub
parent 4d6de7a397
commit 22693dca1c
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1 changed files with 111 additions and 97 deletions
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210
bin/Decoder.py
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@ -5,6 +5,10 @@
Dectect Binary and decode it
"""
##################################
# Import External packages
##################################
import time
import os
import redis
@ -13,16 +17,19 @@ from hashlib import sha1
import magic
import json
import datetime
from pubsublogger import publisher
import re
import signal
from lib import Decoded
##################################
# Import Project packages
##################################
from module.abstract_module import AbstractModule
from Helper import Process
from packages import Item
from lib import Decoded
import re
import signal
class TimeoutException(Exception):
pass
@ -32,28 +39,108 @@ def timeout_handler(signum, frame):
signal.signal(signal.SIGALRM, timeout_handler)
def hex_decoder(hexStr):
class Decoder(AbstractModule):
"""
Decoder module for AIL framework
"""
# TODO to lambda expr
def hex_decoder(self, hexStr):
#hexStr = ''.join( hex_string.split(" ") )
return bytes(bytearray([int(hexStr[i:i+2], 16) for i in range(0, len(hexStr), 2)]))
def binary_decoder(binary_string):
# TODO to lambda expr
def binary_decoder(self, binary_string):
return bytes(bytearray([int(binary_string[i:i+8], 2) for i in range(0, len(binary_string), 8)]))
def base64_decoder(base64_string):
# TODO to lambda expr
def base64_decoder(self, base64_string):
return base64.b64decode(base64_string)
def decode_string(content, item_id, item_date, encoded_list, decoder_name, encoded_min_size):
def __init__(self):
super(Decoder, self).__init__(logger_channel="script:decoder")
serv_metadata = redis.StrictRedis(
host=self.process.config.get("ARDB_Metadata", "host"),
port=self.process.config.getint("ARDB_Metadata", "port"),
db=self.process.config.getint("ARDB_Metadata", "db"),
decode_responses=True)
regex_binary = '[0-1]{40,}'
#regex_hex = '(0[xX])?[A-Fa-f0-9]{40,}'
regex_hex = '[A-Fa-f0-9]{40,}'
regex_base64 = '(?:[A-Za-z0-9+/]{4}){2,}(?:[A-Za-z0-9+/]{2}[AEIMQUYcgkosw048]=|[A-Za-z0-9+/][AQgw]==)'
cmp_regex_binary = re.compile(regex_binary)
cmp_regex_hex = re.compile(regex_hex)
cmp_regex_base64 = re.compile(regex_base64)
# map decoder function
self.decoder_function = {'binary':self.binary_decoder,'hexadecimal':self.hex_decoder, 'base64':self.base64_decoder}
hex_max_execution_time = self.process.config.getint("Hex", "max_execution_time")
binary_max_execution_time = self.process.config.getint("Binary", "max_execution_time")
base64_max_execution_time = self.process.config.getint("Base64", "max_execution_time")
# list all decoder with regex,
decoder_binary = {'name': 'binary', 'regex': cmp_regex_binary, 'encoded_min_size': 300, 'max_execution_time': binary_max_execution_time}
decoder_hexadecimal = {'name': 'hexadecimal', 'regex': cmp_regex_hex, 'encoded_min_size': 300, 'max_execution_time': hex_max_execution_time}
decoder_base64 = {'name': 'base64', 'regex': cmp_regex_base64, 'encoded_min_size': 40, 'max_execution_time': base64_max_execution_time}
self.decoder_order = [ decoder_base64, decoder_binary, decoder_hexadecimal, decoder_base64]
for decoder in self.decoder_order:
serv_metadata.sadd('all_decoder', decoder['name'])
# Waiting time in secondes between to message proccessed
self.pending_seconds = 1
# Send module state to logs
self.redis_logger.info(f'Module {self.module_name} initialized')
def compute(self, message):
obj_id = Item.get_item_id(message)
# Extract info from message
content = Item.get_item_content(obj_id)
date = Item.get_item_date(obj_id)
for decoder in self.decoder_order: # add threshold and size limit
# max execution time on regex
signal.alarm(decoder['max_execution_time'])
try:
encoded_list = decoder['regex'].findall(content)
except TimeoutException:
encoded_list = []
self.process.incr_module_timeout_statistic() # add encoder type
self.redis_logger.debug(f"{obj_id} processing timeout")
continue
else:
signal.alarm(0)
if(len(encoded_list) > 0):
content = self.decode_string(content, message, date, encoded_list, decoder['name'], decoder['encoded_min_size'])
def decode_string(self, content, item_id, item_date, encoded_list, decoder_name, encoded_min_size):
find = False
for encoded in encoded_list:
if len(encoded) >= encoded_min_size:
decoded_file = decoder_function[decoder_name](encoded)
decoded_file = self.decoder_function[decoder_name](encoded)
find = True
sha1_string = sha1(decoded_file).hexdigest()
mimetype = Decoded.get_file_mimetype(decoded_file)
if not mimetype:
print(item_id)
print(sha1_string)
self.redis_logger.debug(item_id)
self.redis_logger.debug(sha1_string)
raise Exception('Invalid mimetype')
Decoded.save_decoded_file_content(sha1_string, decoded_file, item_date, mimetype=mimetype)
Decoded.save_item_relationship(sha1_string, item_id)
@ -62,98 +149,25 @@ def decode_string(content, item_id, item_date, encoded_list, decoder_name, encod
#remove encoded from item content
content = content.replace(encoded, '', 1)
print('{} : {} - {}'.format(item_id, decoder_name, mimetype))
self.redis_logger.debug(f'{item_id} : {decoder_name} - {mimetype}')
if(find):
set_out_item(decoder_name, item_id)
self.set_out_item(decoder_name, item_id)
return content
def set_out_item(decoder_name, item_id):
publisher.warning(decoder_name+' decoded')
#Send to duplicate
p.populate_set_out(item_id, 'Duplicate')
msg = 'infoleak:automatic-detection="'+decoder_name+'";{}'.format(item_id)
p.populate_set_out(msg, 'Tags')
def set_out_item(self, decoder_name, item_id):
self.redis_logger.warning(f'{decoder_name} decoded')
# Send to duplicate
self.process.populate_set_out(item_id, 'Duplicate')
# Send to Tags
msg = f'infoleak:automatic-detection="{decoder_name}";{item_id}'
self.process.populate_set_out(msg, 'Tags')
if __name__ == '__main__':
# If you wish to use an other port of channel, do not forget to run a subscriber accordingly (see launch_logs.sh)
# Port of the redis instance used by pubsublogger
publisher.port = 6380
# Script is the default channel used for the modules.
publisher.channel = 'Script'
# Section name in bin/packages/modules.cfg
config_section = 'Decoder'
# Setup the I/O queues
p = Process(config_section)
serv_metadata = redis.StrictRedis(
host=p.config.get("ARDB_Metadata", "host"),
port=p.config.getint("ARDB_Metadata", "port"),
db=p.config.getint("ARDB_Metadata", "db"),
decode_responses=True)
# Sent to the logging a description of the module
publisher.info("Decoder started")
regex_binary = '[0-1]{40,}'
#regex_hex = '(0[xX])?[A-Fa-f0-9]{40,}'
regex_hex = '[A-Fa-f0-9]{40,}'
regex_base64 = '(?:[A-Za-z0-9+/]{4}){2,}(?:[A-Za-z0-9+/]{2}[AEIMQUYcgkosw048]=|[A-Za-z0-9+/][AQgw]==)'
re.compile(regex_binary)
re.compile(regex_hex)
re.compile(regex_base64)
# map decoder function
decoder_function = {'binary':binary_decoder,'hexadecimal':hex_decoder, 'base64':base64_decoder}
hex_max_execution_time = p.config.getint("Hex", "max_execution_time")
binary_max_execution_time = p.config.getint("Binary", "max_execution_time")
base64_max_execution_time = p.config.getint("Base64", "max_execution_time")
# list all decoder yith regex,
decoder_binary = {'name': 'binary', 'regex': regex_binary, 'encoded_min_size': 300, 'max_execution_time': binary_max_execution_time}
decoder_hexadecimal = {'name': 'hexadecimal', 'regex': regex_hex, 'encoded_min_size': 300, 'max_execution_time': hex_max_execution_time}
decoder_base64 = {'name': 'base64', 'regex': regex_base64, 'encoded_min_size': 40, 'max_execution_time': base64_max_execution_time}
decoder_order = [ decoder_base64, decoder_binary, decoder_hexadecimal, decoder_base64]
for decoder in decoder_order:
serv_metadata.sadd('all_decoder', decoder['name'])
# Endless loop getting messages from the input queue
while True:
# Get one message from the input queue
message = p.get_from_set()
if message is None:
publisher.debug("{} queue is empty, waiting".format(config_section))
time.sleep(1)
continue
obj_id = Item.get_item_id(message)
# Do something with the message from the queue
content = Item.get_item_content(obj_id)
date = Item.get_item_date(obj_id)
for decoder in decoder_order: # add threshold and size limit
# max execution time on regex
signal.alarm(decoder['max_execution_time'])
try:
encoded_list = re.findall(decoder['regex'], content)
except TimeoutException:
encoded_list = []
p.incr_module_timeout_statistic() # add encoder type
print ("{0} processing timeout".format(obj_id))
continue
else:
signal.alarm(0)
if(len(encoded_list) > 0):
content = decode_string(content, message, date, encoded_list, decoder['name'], decoder['encoded_min_size'])
module = Decoder()
module.run()