/
enc.py
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/
enc.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# The MIT License (MIT)
#
# Copyright (c) [2016] [Robert Kvant]
#
# 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
# HexChat Python Interface Documentation
# https://hexchat.readthedocs.io/en/latest/script_python.html
import hexchat
import subprocess
import os
__module_name__ = "hexchat-encrypt"
__module_version__ = "1.0.0"
__module_description__ = "hexchat symmetric encryption"
PROCESSING = False
PASSFILE = "/home/user/pass.key" # Path to passwordfile
DIALOGS = set()
DEBUG = False
MCHARSIZE = 330
""" Encrypt 'plaintext' through the openssl command line client """
def encrypt(plaintext):
process = subprocess.Popen(
["openssl","enc","-aes-256-cbc","-e","-salt","-a","-A","-pass","file:" + PASSFILE],
stdin=subprocess.PIPE,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
stdout,stderr = process.communicate(plaintext)
if process.returncode == 0: return stdout # Return as base64
raise Exception(stderr)
""" Decrypt 'cryptogram' through the openssl command line client """
def decrypt(cryptogram):
process = subprocess.Popen(
["openssl","enc","-aes-256-cbc","-d","-salt","-a","-A","-pass","file:" + PASSFILE],
stdin=subprocess.PIPE,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
stdout,stderr = process.communicate(cryptogram)
if process.returncode == 0: return stdout
raise Exception(stderr)
""" Invoked every time a user sends a message """
def send(word, word_eol, userdata):
ctxt = hexchat.get_context()
""" Only encrypt outgoing message if channel/server
is added to DIALOGS list """
if channelServer(ctxt) in DIALOGS:
try:
message = word_eol[0]
""" To avoid the encrypted text gets cut off during transmission
encrypt and send the message in chunks of MCHARSIZE character-
length . """
for x in range(0,len(message),MCHARSIZE):
""" To mark the message as encrypted, 'HEXCHATENC:' is
concatenated to the encrypted message. """
hexchat.command('PRIVMSG %s :%s' %
(ctxt.get_info('channel'), "HEXCHATENC:"
+ encrypt(message[x:x+MCHARSIZE])))
""" Message sent, print to dialog window"""
hexchat.emit_print('Your Message',
hexchat.get_info('nick'), textPos(message))
return hexchat.EAT_HEXCHAT
except Exception as e:
ctxt.prnt(textNeg("Could not encrypt!"))
if DEBUG: ctxt.prnt(str(e))
return hexchat.EAT_ALL
return hexchat.EAT_NONE
""" Invoked every time a message is received in a private dialog """
def receive(word, word_eol, userdata):
global PROCESSING
if PROCESSING:
return hexchat.EAT_NONE
sender,message = word[0],word[1]
ctxt = hexchat.get_context()
""" If the first 11 characters of the received message
is the word 'HEXCHATENC:' the text is probably encrypted """
if message[:11] == "HEXCHATENC:":
try:
plaintext = decrypt(message[11:])
""" If sender not in DIALOGS -> enable outgoing
encryption for this context """
if channelServer(ctxt) not in DIALOGS:
enable(ctxt)
PROCESSING = True
""" Message decrypted, print to dialog window"""
ctxt.emit_print('Private Message to Dialog',
sender, textPos(plaintext))
PROCESSING = False
return hexchat.EAT_HEXCHAT
except Exception as e:
ctxt.prnt(textNeg("Could not decrypt!"))
if DEBUG: ctxt.prnt(str(e))
return hexchat.EAT_NONE
""" Enable outgoing encryption on current channel """
def enable(ctxt):
if isDialog(ctxt):
DIALOGS.add(channelServer(ctxt))
ctxt.prnt(textPos("Encryption enabled"))
else:
ctxt.prnt(textNeg("Encryption can only be enabled" +
" on private dialog windows"))
return hexchat.EAT_ALL
""" Disable outgoing encryption on current channel """
def disable(ctxt):
if channelServer(ctxt) in DIALOGS:
DIALOGS.remove(channelServer(ctxt))
ctxt.prnt(textNeg("Encryption disabled"))
return hexchat.EAT_ALL
""" Enable/disable verbose error messages """
def debug(ctxt):
global DEBUG
DEBUG ^= 1
ctxt.prnt("Debug enabled" if DEBUG
else "Debug disabled")
return hexchat.EAT_ALL
""" Return channel and servername from the specified context """
def channelServer(ctxt):
return (ctxt.get_info('channel'), ctxt.get_info('server'))
""" Returns true if current context is a dialog window """
def isDialog(ctxt):
return [x.type for x in ctxt.get_list('channels')
if x.channel == ctxt.get_info('channel')][0] == 3
""" Return 'message' as green text """
def textPos(message):
return "\x0303" + message
""" Return 'message' as red text """
def textNeg(message):
return "\x0304" + message
""" Return 'message' as bold text """
def textBold(message):
return "\002" + message
""" Handles all /enc command arguments"""
def enc(word,word_eol,userdata):
ctxt = hexchat.get_context()
try:
arg = word[1]
if arg == "enable":
enable(ctxt)
elif arg == "disable":
disable(ctxt)
elif arg == "info":
info(ctxt)
elif arg == "debug":
debug(ctxt)
else:
raise Exception
except Exception:
help(ctxt)
return hexchat.EAT_ALL
""" Initialization"""
def init():
try:
if os.path.isfile(PASSFILE):
hexchat.prnt(textPos(PASSFILE + " loaded!"))
hexchat.hook_command('', send)
hexchat.hook_command('enc', enc, help="For help use the command /enc")
hexchat.hook_print('Private Message to Dialog', receive)
else:
hexchat.prnt(textNeg("Could not open passfile"))
except Exception as e:
hexchat.prnt(textNeg(str(e)))
""" Print info about encryption/debug/passfile """
def info(ctxt):
ctxt.prnt(textBold("------------------ Info ------------------"))
ctxt.prnt("* Passfile: " + PASSFILE )
ctxt.prnt("* Debug enabled" if DEBUG else "* Debug disabled")
ctxt.prnt("* Encryption enabled" if channelServer(ctxt) in
DIALOGS else "* Encryption disabled")
return hexchat.EAT_ALL
""" Print help summary """
def help(ctxt):
ctxt.prnt(textBold("------------------ Help ------------------"))
ctxt.prnt("/enc enable - Encrypt outgoing messages on current dialog window")
ctxt.prnt("/enc disable - Disable encryption of outgoing messages on current dialog window")
ctxt.prnt("/enc info - Print status about debug/encryption")
return hexchat.EAT_ALL
init()