Skip to content

Commit

Permalink
Convert tabs to spaces and set some defaults in __init__
Browse files Browse the repository at this point in the history
  • Loading branch information
@leonjza
leonjza committed Aug 26, 2016
1 parent 914674d commit 7c839e5
Showing 1 changed file with 166 additions and 140 deletions.
306 changes: 166 additions & 140 deletions lib/FrameProcessor.py
View file
@@ -1,145 +1,171 @@
# The MIT License (MIT)
#
# Copyright (c) 2014-2016 Leon Jacobs
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

import hashlib
import os.path
from Crypto.Cipher import AES

from Crypt import CryptString

class ProcessFrame():

def __init__(self):
self.position = 0
self.expected = 0
self.framestore = []
self.out_file = ''
self.secret = None
self.encrypted = False
self.identifier = None

def setOutfile(self, out_file):
self.out_file = out_file

def setData(self, frame):
self.frame = frame

def setSecret(self, secret):
if secret:
self.secret = secret

def process(self):
print '[INFO] Processing frame', self.frame

try:
frame_pos = int(self.frame[0:4])
except Exception, e:
print '[CRITICAL] Unable to determine a position. Error:', str(e)
print '[CRITICAL] Maybe we are not getting a message really or `-X` was used with the sender.'
return

# first of all, check of this is not the last frame
if len(str(self.frame).replace('0', '')) == 0:

# check that we got all of the parts of the message
if self.expected <> self.position:
print '[ERROR] EOF received but complete message was not received.'
print '[ERROR] Expected:', self.expected
print '[ERROR] Position:', self.position
return

# merge the payloads, and checksum the result
combined_payloads = ''.join(self.framestore).decode('hex')
checksum = hashlib.sha1(combined_payloads).hexdigest()

if self.checksum == checksum:

print '[OK] Message seems to be intact and passes sha1 checksum of', self.checksum
print '[OK] Message was received in', self.expected + 2, 'requests'

# check if self.encrypted & if a key is available.
# if so, decrypt combined_payloads
if self.encrypted:
if not self.secret:
print '[CRITICAL] Message is encrypted, but no secret is available. Set one with `-s`'
return

# decrypt the message
d = CryptString(self.secret)
combined_payloads = d.decode(combined_payloads)
if not combined_payloads:
print '[ERROR] Encrypted message failed to decode'
return

print '[INFO] Message has been decrypted with the configured secret'

# if we need to write this too a file, do it
if self.out_file:
print '[OK] Writing contents to', self.out_file

# check if self.out_file already exists.
if os.path.isfile(self.out_file):
print '[INFO]', self.out_file, 'already exists.'

if self.identifier:
self.out_file = self.out_file + '-' + self.identifier
else:
self.out_file = self.out_file + '-' + self.checksum[:8]

# open the file and write the message
print '[INFO] Writing to', repr(os.path.abspath(self.out_file))

with open(os.path.abspath(str(self.out_file)),'w') as f:
f.write(combined_payloads)

print '[OK] Done writing contents to', self.out_file

# else, just print it
else:
print 'Message identifier:', self.identifier, '\n'
print '---START OF MESSAGE---'
print combined_payloads
print '---END OF MESSAGE---'

else:
print '[CRITICAL] Message does not pass checksum validation. Receive Failed.'
self.position = 0
self.expected = 0
self.framestore = []

return

# new input starting, read the amount of expected frames
if frame_pos == 0:
# split by : and and get the number of extected frames, minus this one
self.expected = int(self.frame.split(':')[0])

# check if the received message will be encrypted
if int((self.frame.split(':')[1])[:1]) == 1:
self.encrypted = True

self.position = 0
self.framestore = []
self.identifier = None
return

# set the identifier and stip null bytes \x00
if frame_pos == 1:
ident = (self.frame[4:].decode('hex')).split(b'\0',1)[0]
if ident == 'None':
self.identifier = None
return

self.identifier = ident
return

# get the sha1hash of the end message we will be getting
if frame_pos == 2:
self.checksum = self.frame[4:]
self.position = frame_pos
return

# if the current frame value is the stored one + 1, then this is the next one
# to record, do it
if frame_pos == self.position + 1:
self.position = frame_pos
self.framestore.append(self.frame[4:])
return

print '[WARNING]: Out of sync frames received! We are expecting frame', self.position + 1, 'but got', frame_pos
class ProcessFrame:
def __init__(self):
self.position = 0
self.expected = 0
self.framestore = []
self.out_file = ''
self.secret = None
self.encrypted = False
self.identifier = None

# Other defaults
self.frame = None
self.checksum = None

def set_outfile(self, out_file):
self.out_file = out_file

def set_data(self, frame):
self.frame = frame

def set_secret(self, secret):
if secret:
self.secret = secret

def process(self):
print '[INFO] Processing frame', self.frame

try:
frame_pos = int(self.frame[0:4])
except Exception, e:
print '[CRITICAL] Unable to determine a position. Error:', str(e)
print '[CRITICAL] Maybe we are not getting a message really or `-X` was used with the sender.'
return

# first of all, check of this is not the last frame
if len(str(self.frame).replace('0', '')) == 0:

# check that we got all of the parts of the message
if self.expected <> self.position:
print '[ERROR] EOF received but complete message was not received.'
print '[ERROR] Expected:', self.expected
print '[ERROR] Position:', self.position
return

# merge the payloads, and checksum the result
combined_payloads = ''.join(self.framestore).decode('hex')
checksum = hashlib.sha1(combined_payloads).hexdigest()

if self.checksum == checksum:

print '[OK] Message seems to be intact and passes sha1 checksum of', self.checksum
print '[OK] Message was received in', self.expected + 2, 'requests'

# check if self.encrypted & if a key is available.
# if so, decrypt combined_payloads
if self.encrypted:
if not self.secret:
print '[CRITICAL] Message is encrypted, but no secret is available. Set one with `-s`'
return

# decrypt the message
d = CryptString(self.secret)
combined_payloads = d.decode(combined_payloads)
if not combined_payloads:
print '[ERROR] Encrypted message failed to decode'
return

print '[INFO] Message has been decrypted with the configured secret'

# if we need to write this too a file, do it
if self.out_file:
print '[OK] Writing contents to', self.out_file

# check if self.out_file already exists.
if os.path.isfile(self.out_file):
print '[INFO]', self.out_file, 'already exists.'

if self.identifier:
self.out_file = self.out_file + '-' + self.identifier
else:
self.out_file = self.out_file + '-' + self.checksum[:8]

# open the file and write the message
print '[INFO] Writing to', repr(os.path.abspath(self.out_file))

with open(os.path.abspath(str(self.out_file)), 'w') as f:
f.write(combined_payloads)

print '[OK] Done writing contents to', self.out_file

# else, just print it
else:
print 'Message identifier:', self.identifier, '\n'
print '---START OF MESSAGE---'
print combined_payloads
print '---END OF MESSAGE---'

else:
print '[CRITICAL] Message does not pass checksum validation. Receive Failed.'
self.position = 0
self.expected = 0
self.framestore = []

return

# new input starting, read the amount of expected frames
if frame_pos == 0:
# split by : and and get the number of extected frames, minus this one
self.expected = int(self.frame.split(':')[0])

# check if the received message will be encrypted
if int((self.frame.split(':')[1])[:1]) == 1:
self.encrypted = True

self.position = 0
self.framestore = []
self.identifier = None
return

# set the identifier and stip null bytes \x00
if frame_pos == 1:
ident = (self.frame[4:].decode('hex')).split(b'\0', 1)[0]
if ident == 'None':
self.identifier = None
return

self.identifier = ident
return

# get the sha1hash of the end message we will be getting
if frame_pos == 2:
self.checksum = self.frame[4:]
self.position = frame_pos
return

# if the current frame value is the stored one + 1, then this is the next one
# to record, do it
if frame_pos == self.position + 1:
self.position = frame_pos
self.framestore.append(self.frame[4:])
return

print '[WARNING]: Out of sync frames received! We are expecting frame', self.position + 1, 'but got', frame_pos

0 comments on commit 7c839e5

Please sign in to comment.