494 lines
18 KiB
Python
494 lines
18 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# Version 3.1.3 August 2015
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# Add translations for Portuguese and Arabic
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#
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# Version 3.1.2 January 2015
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# Add coding, version number and version announcement
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#
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# Version 3.05 October 2014
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# Identifies DRM-free books in the dialog
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#
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# Version 3.04 September 2014
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# Handles DRM-free books as well (sometimes Kobo Library doesn't
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# show download link for DRM-free books)
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#
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# Version 3.03 August 2014
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# If PyCrypto is unavailable try to use libcrypto for AES_ECB.
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#
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# Version 3.02 August 2014
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# Relax checking of application/xhtml+xml and image/jpeg content.
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#
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# Version 3.01 June 2014
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# Check image/jpeg as well as application/xhtml+xml content. Fix typo
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# in Windows ipconfig parsing.
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#
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# Version 3.0 June 2014
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# Made portable for Mac and Windows, and the only module dependency
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# not part of python core is PyCrypto. Major code cleanup/rewrite.
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# No longer tries the first MAC address; tries them all if it detects
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# the decryption failed.
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#
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# Updated September 2013 by Anon
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# Version 2.02
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# Incorporated minor fixes posted at Apprentice Alf's.
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#
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# Updates July 2012 by Michael Newton
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# PWSD ID is no longer a MAC address, but should always
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# be stored in the registry. Script now works with OS X
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# and checks plist for values instead of registry. Must
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# have biplist installed for OS X support.
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#
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# Original comments left below; note the "AUTOPSY" is inaccurate. See
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# KoboLibrary.userkeys and KoboFile.decrypt()
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#
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##########################################################
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# KOBO DRM CRACK BY #
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# PHYSISTICATED #
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##########################################################
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# This app was made for Python 2.7 on Windows 32-bit
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#
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# This app needs pycrypto - get from here:
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# http://www.voidspace.org.uk/python/modules.shtml
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#
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# Usage: obok.py
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# Choose the book you want to decrypt
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#
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# Shouts to my krew - you know who you are - and one in
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# particular who gave me a lot of help with this - thank
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# you so much!
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#
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# Kopimi /K\
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# Keep sharing, keep copying, but remember that nothing is
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# for free - make sure you compensate your favorite
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# authors - and cut out the middle man whenever possible
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# ;) ;) ;)
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#
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# DRM AUTOPSY
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# The Kobo DRM was incredibly easy to crack, but it took
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# me months to get around to making this. Here's the
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# basics of how it works:
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# 1: Get MAC address of first NIC in ipconfig (sometimes
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# stored in registry as pwsdid)
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# 2: Get user ID (stored in tons of places, this gets it
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# from HKEY_CURRENT_USER\Software\Kobo\Kobo Desktop
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# Edition\Browser\cookies)
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# 3: Concatenate and SHA256, take the second half - this
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# is your master key
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# 4: Open %LOCALAPPDATA%\Kobo Desktop Editions\Kobo.sqlite
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# and dump content_keys
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# 5: Unbase64 the keys, then decode these with the master
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# key - these are your page keys
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# 6: Unzip EPUB of your choice, decrypt each page with its
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# page key, then zip back up again
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#
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# WHY USE THIS WHEN INEPT WORKS FINE? (adobe DRM stripper)
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# Inept works very well, but authors on Kobo can choose
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# what DRM they want to use - and some have chosen not to
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# let people download them with Adobe Digital Editions -
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# they would rather lock you into a single platform.
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#
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# With Obok, you can sync Kobo Desktop, decrypt all your
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# ebooks, and then use them on whatever device you want
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# - you bought them, you own them, you can do what you
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# like with them.
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#
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# Obok is Kobo backwards, but it is also means "next to"
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# in Polish.
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# When you buy a real book, it is right next to you. You
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# can read it at home, at work, on a train, you can lend
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# it to a friend, you can scribble on it, and add your own
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# explanations/translations.
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#
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# Obok gives you this power over your ebooks - no longer
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# are you restricted to one device. This allows you to
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# embed foreign fonts into your books, as older Kobo's
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# can't display them properly. You can read your books
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# on your phones, in different PC readers, and different
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# ereader devices. You can share them with your friends
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# too, if you like - you can do that with a real book
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# after all.
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#
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"""Manage all Kobo books, either encrypted or DRM-free."""
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__version__ = '3.1.3'
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import sys
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import os
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import subprocess
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import sqlite3
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import base64
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import binascii
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import re
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import zipfile
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import hashlib
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import xml.etree.ElementTree as ET
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import string
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import shutil
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class ENCRYPTIONError(Exception):
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pass
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def _load_crypto_libcrypto():
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from ctypes import CDLL, POINTER, c_void_p, c_char_p, c_int, c_long, \
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Structure, c_ulong, create_string_buffer, cast
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from ctypes.util import find_library
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if sys.platform.startswith('win'):
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libcrypto = find_library('libeay32')
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else:
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libcrypto = find_library('crypto')
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if libcrypto is None:
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raise ENCRYPTIONError('libcrypto not found')
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libcrypto = CDLL(libcrypto)
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AES_MAXNR = 14
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c_char_pp = POINTER(c_char_p)
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c_int_p = POINTER(c_int)
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class AES_KEY(Structure):
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_fields_ = [('rd_key', c_long * (4 * (AES_MAXNR + 1))),
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('rounds', c_int)]
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AES_KEY_p = POINTER(AES_KEY)
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def F(restype, name, argtypes):
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func = getattr(libcrypto, name)
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func.restype = restype
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func.argtypes = argtypes
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return func
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AES_set_decrypt_key = F(c_int, 'AES_set_decrypt_key',
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[c_char_p, c_int, AES_KEY_p])
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AES_ecb_encrypt = F(None, 'AES_ecb_encrypt',
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[c_char_p, c_char_p, AES_KEY_p, c_int])
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class AES(object):
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def __init__(self, userkey):
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self._blocksize = len(userkey)
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if (self._blocksize != 16) and (self._blocksize != 24) and (self._blocksize != 32) :
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raise ENCRYPTIONError(_('AES improper key used'))
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return
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key = self._key = AES_KEY()
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rv = AES_set_decrypt_key(userkey, len(userkey) * 8, key)
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if rv < 0:
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raise ENCRYPTIONError(_('Failed to initialize AES key'))
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def decrypt(self, data):
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clear = ''
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for i in range(0, len(data), 16):
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out = create_string_buffer(16)
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rv = AES_ecb_encrypt(data[i:i+16], out, self._key, 0)
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if rv == 0:
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raise ENCRYPTIONError(_('AES decryption failed'))
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clear += out.raw
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return clear
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return AES
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def _load_crypto_pycrypto():
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from Crypto.Cipher import AES as _AES
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class AES(object):
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def __init__(self, key):
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self._aes = _AES.new(key, _AES.MODE_ECB)
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def decrypt(self, data):
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return self._aes.decrypt(data)
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return AES
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def _load_crypto():
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AES = None
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cryptolist = (_load_crypto_pycrypto, _load_crypto_libcrypto)
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for loader in cryptolist:
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try:
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AES = loader()
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break
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except (ImportError, ENCRYPTIONError):
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pass
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return AES
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AES = _load_crypto()
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class KoboLibrary(object):
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"""The Kobo library.
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This class represents all the information available from the data
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written by the Kobo Desktop Edition application, including the list
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of books, their titles, and the user's encryption key(s)."""
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def __init__ (self):
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print u"Obok v{0}\nCopyright © 2012-2014 Physisticated et al.".format(__version__)
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if sys.platform.startswith('win'):
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if sys.getwindowsversion().major > 5:
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self.kobodir = os.environ['LOCALAPPDATA']
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else:
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self.kobodir = os.path.join(os.environ['USERPROFILE'], 'Local Settings', 'Application Data')
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self.kobodir = os.path.join(self.kobodir, 'Kobo', 'Kobo Desktop Edition')
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elif sys.platform.startswith('darwin'):
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self.kobodir = os.path.join(os.environ['HOME'], 'Library', 'Application Support', 'Kobo', 'Kobo Desktop Edition')
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self.bookdir = os.path.join(self.kobodir, 'kepub')
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kobodb = os.path.join(self.kobodir, 'Kobo.sqlite')
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self.__sqlite = sqlite3.connect(kobodb)
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self.__cursor = self.__sqlite.cursor()
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self._userkeys = []
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self._books = []
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self._volumeID = []
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def close (self):
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"""Closes the database used by the library."""
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self.__cursor.close()
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self.__sqlite.close()
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@property
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def userkeys (self):
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"""The list of potential userkeys being used by this library.
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Only one of these will be valid.
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"""
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if len(self._userkeys) != 0:
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return self._userkeys
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userid = self.__getuserid()
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for macaddr in self.__getmacaddrs():
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self._userkeys.append(self.__getuserkey(macaddr, userid))
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return self._userkeys
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@property
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def books (self):
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"""The list of KoboBook objects in the library."""
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if len(self._books) != 0:
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return self._books
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"""Drm-ed kepub"""
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for row in self.__cursor.execute('SELECT DISTINCT volumeid, Title, Attribution, Series FROM content_keys, content WHERE contentid = volumeid'):
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self._books.append(KoboBook(row[0], row[1], self.__bookfile(row[0]), 'kepub', self.__cursor, author=row[2], series=row[3]))
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self._volumeID.append(row[0])
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"""Drm-free"""
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for f in os.listdir(self.bookdir):
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if(f not in self._volumeID):
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row = self.__cursor.execute("SELECT Title, Attribution, Series FROM content WHERE ContentID = '" + f + "'").fetchone()
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if row is not None:
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fTitle = row[0]
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self._books.append(KoboBook(f, fTitle, self.__bookfile(f), 'drm-free', self.__cursor, author=row[1], series=row[2]))
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self._volumeID.append(f)
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"""Sort"""
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self._books.sort(key=lambda x: x.title)
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return self._books
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def __bookfile (self, volumeid):
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"""The filename needed to open a given book."""
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return os.path.join(self.kobodir, 'kepub', volumeid)
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def __getmacaddrs (self):
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"""The list of all MAC addresses on this machine."""
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macaddrs = []
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if sys.platform.startswith('win'):
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c = re.compile('\s(' + '[0-9a-f]{2}-' * 5 + '[0-9a-f]{2})(\s|$)', re.IGNORECASE)
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for line in os.popen('ipconfig /all'):
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m = c.search(line)
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if m:
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macaddrs.append(re.sub("-", ":", m.group(1)).upper())
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elif sys.platform.startswith('darwin'):
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c = re.compile('\s(' + '[0-9a-f]{2}:' * 5 + '[0-9a-f]{2})(\s|$)', re.IGNORECASE)
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output = subprocess.check_output('/sbin/ifconfig -a', shell=True)
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matches = c.findall(output)
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for m in matches:
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# print "m:",m[0]
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macaddrs.append(m[0].upper())
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return macaddrs
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def __getuserid (self):
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return self.__cursor.execute('SELECT UserID FROM user WHERE HasMadePurchase = "true"').fetchone()[0]
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def __getuserkey (self, macaddr, userid):
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deviceid = hashlib.sha256('NoCanLook' + macaddr).hexdigest()
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userkey = hashlib.sha256(deviceid + userid).hexdigest()
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return binascii.a2b_hex(userkey[32:])
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class KoboBook(object):
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"""A Kobo book.
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A Kobo book contains a number of unencrypted and encrypted files.
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This class provides a list of the encrypted files.
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Each book has the following instance variables:
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volumeid - a UUID which uniquely refers to the book in this library.
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title - the human-readable book title.
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filename - the complete path and filename of the book.
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type - either kepub or drm-free"""
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def __init__ (self, volumeid, title, filename, type, cursor, author=None, series=None):
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self.volumeid = volumeid
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self.title = title
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self.author = author
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self.series = series
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self.series_index = None
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self.filename = filename
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self.type = type
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self.__cursor = cursor
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self._encryptedfiles = {}
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@property
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def encryptedfiles (self):
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"""A dictionary of KoboFiles inside the book.
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The dictionary keys are the relative pathnames, which are
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the same as the pathnames inside the book 'zip' file."""
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if (self.type == 'drm-free'):
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return self._encryptedfiles
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if len(self._encryptedfiles) != 0:
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return self._encryptedfiles
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# Read the list of encrypted files from the DB
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for row in self.__cursor.execute('SELECT elementid,elementkey FROM content_keys,content WHERE volumeid = ? AND volumeid = contentid',(self.volumeid,)):
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self._encryptedfiles[row[0]] = KoboFile(row[0], None, base64.b64decode(row[1]))
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# Read the list of files from the kepub OPF manifest so that
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# we can get their proper MIME type.
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# NOTE: this requires that the OPF file is unencrypted!
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zin = zipfile.ZipFile(self.filename, "r")
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xmlns = {
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'ocf': 'urn:oasis:names:tc:opendocument:xmlns:container',
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'opf': 'http://www.idpf.org/2007/opf'
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}
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ocf = ET.fromstring(zin.read('META-INF/container.xml'))
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opffile = ocf.find('.//ocf:rootfile', xmlns).attrib['full-path']
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basedir = re.sub('[^/]+$', '', opffile)
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opf = ET.fromstring(zin.read(opffile))
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zin.close()
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c = re.compile('/')
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for item in opf.findall('.//opf:item', xmlns):
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mimetype = item.attrib['media-type']
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# Convert relative URIs
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href = item.attrib['href']
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if not c.match(href):
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href = string.join((basedir, href), '')
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# Update books we've found from the DB.
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if href in self._encryptedfiles:
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self._encryptedfiles[href].mimetype = mimetype
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return self._encryptedfiles
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@property
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def has_drm (self):
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return not self.type == 'drm-free'
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class KoboFile(object):
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"""An encrypted file in a KoboBook.
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Each file has the following instance variables:
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filename - the relative pathname inside the book zip file.
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mimetype - the file's MIME type, e.g. 'image/jpeg'
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key - the encrypted page key."""
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def __init__ (self, filename, mimetype, key):
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self.filename = filename
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self.mimetype = mimetype
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self.key = key
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def decrypt (self, userkey, contents):
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"""
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Decrypt the contents using the provided user key and the
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file page key. The caller must determine if the decrypted
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data is correct."""
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# The userkey decrypts the page key (self.key)
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keyenc = AES(userkey)
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decryptedkey = keyenc.decrypt(self.key)
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# The decrypted page key decrypts the content
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pageenc = AES(decryptedkey)
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return self.__removeaespadding(pageenc.decrypt(contents))
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def check (self, contents):
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"""
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If the contents uses some known MIME types, check if it
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conforms to the type. Throw a ValueError exception if not.
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If the contents uses an uncheckable MIME type, don't check
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it and don't throw an exception.
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Returns True if the content was checked, False if it was not
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checked."""
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if self.mimetype == 'application/xhtml+xml':
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if contents[:5]=="<?xml":
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return True
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else:
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print "Bad XML: ",contents[:5]
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raise ValueError
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if self.mimetype == 'image/jpeg':
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if contents[:3] == '\xff\xd8\xff':
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return True
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else:
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print "Bad JPEG: ", contents[:3].encode('hex')
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raise ValueError()
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return False
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def __removeaespadding (self, contents):
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"""
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Remove the trailing padding, using what appears to be the CMS
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algorithm from RFC 5652 6.3"""
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lastchar = binascii.b2a_hex(contents[-1:])
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strlen = int(lastchar, 16)
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padding = strlen
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if strlen == 1:
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return contents[:-1]
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if strlen < 16:
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for i in range(strlen):
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testchar = binascii.b2a_hex(contents[-strlen:-(strlen-1)])
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if testchar != lastchar:
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padding = 0
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if padding > 0:
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contents = contents[:-padding]
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return contents
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if __name__ == '__main__':
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lib = KoboLibrary()
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for i, book in enumerate(lib.books):
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print ('%d: %s' % (i + 1, book.title)).encode('ascii', 'ignore')
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num_string = raw_input("Convert book number... ")
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try:
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num = int(num_string)
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book = lib.books[num - 1]
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except (ValueError, IndexError):
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exit()
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print "Converting", book.title
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zin = zipfile.ZipFile(book.filename, "r")
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# make filename out of Unicode alphanumeric and whitespace equivalents from title
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outname = "%s.epub" % (re.sub('[^\s\w]', '', book.title, 0, re.UNICODE))
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if (book.type == 'drm-free'):
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print "DRM-free book, conversion is not needed"
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shutil.copyfile(book.filename, outname)
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print "Book saved as", os.path.join(os.getcwd(), outname)
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exit(0)
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result = 1
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for userkey in lib.userkeys:
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# print "Trying key: ",userkey.encode('hex_codec')
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confirmedGood = False
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try:
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zout = zipfile.ZipFile(outname, "w", zipfile.ZIP_DEFLATED)
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for filename in zin.namelist():
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contents = zin.read(filename)
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if filename in book.encryptedfiles:
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file = book.encryptedfiles[filename]
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contents = file.decrypt(userkey, contents)
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# Parse failures mean the key is probably wrong.
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if not confirmedGood:
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confirmedGood = file.check(contents)
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zout.writestr(filename, contents)
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zout.close()
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print "Book saved as", os.path.join(os.getcwd(), outname)
|
|
result = 0
|
|
break
|
|
except ValueError:
|
|
print "Decryption failed, trying next key"
|
|
zout.close()
|
|
os.remove(outname)
|
|
|
|
zin.close()
|
|
lib.close()
|
|
exit(result)
|