mirror of
https://github.com/noDRM/DeDRM_tools.git
synced 2024-11-05 13:36:10 +06:00
342 lines
14 KiB
Python
342 lines
14 KiB
Python
#!/usr/bin/env python
|
|
# vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
|
|
# -*- coding: utf-8 -*-
|
|
|
|
from __future__ import with_statement
|
|
__license__ = 'GPL v3'
|
|
__docformat__ = 'restructuredtext en'
|
|
|
|
|
|
# Released under the terms of the GNU General Public Licence, version 3 or
|
|
# later. <http://www.gnu.org/licenses/>
|
|
#
|
|
# Requires Calibre version 0.7.55 or higher.
|
|
#
|
|
# All credit given to I ♥ Cabbages for the original standalone scripts.
|
|
# I had the much easier job of converting them to Calibre a plugin.
|
|
#
|
|
# This plugin is meant to decrypt Barnes & Noble Epubs that are protected
|
|
# with a version of Adobe's Adept encryption. It is meant to function without having to
|
|
# install any dependencies... other than having Calibre installed, of course. It will still
|
|
# work if you have Python and PyCrypto already installed, but they aren't necessary.
|
|
#
|
|
# Configuration:
|
|
# Check out the plugin's configuration settings by clicking the "Customize plugin"
|
|
# button when you have the "BnN ePub DeDRM" plugin highlighted (under Preferences->
|
|
# Plugins->File type plugins). Once you have the configuration dialog open, you'll
|
|
# see a Help link on the top right-hand side.
|
|
#
|
|
# Revision history:
|
|
# 0.1.0 - Initial release
|
|
# 0.1.1 - Allow Windows users to make use of openssl if they have it installed.
|
|
# - Incorporated SomeUpdates zipfix routine.
|
|
# 0.1.2 - bug fix for non-ascii file names in encryption.xml
|
|
# 0.1.3 - Try PyCrypto on Windows first
|
|
# 0.1.4 - update zipfix to deal with mimetype not in correct place
|
|
# 0.1.5 - update zipfix to deal with completely missing mimetype files
|
|
# 0.1.6 - update for the new calibre plugin interface
|
|
# 0.1.7 - Fix for potential problem with PyCrypto
|
|
# 0.1.8 - an updated/modified zipfix.py and included zipfilerugged.py
|
|
# 0.2.0 - Completely overhauled plugin configuration dialog and key management/storage
|
|
# 0.2.1 - an updated/modified zipfix.py and included zipfilerugged.py
|
|
# 0.2.2 - added in potential fixes from 0.1.7 that had been missed.
|
|
# 0.2.3 - fixed possible output/unicode problem
|
|
# 0.2.4 - ditched nearly hopeless caselessStrCmp method in favor of uStrCmp.
|
|
# - added ability to rename existing keys.
|
|
|
|
"""
|
|
Decrypt Barnes & Noble ADEPT encrypted EPUB books.
|
|
"""
|
|
|
|
PLUGIN_NAME = 'Ignoble Epub DeDRM'
|
|
PLUGIN_VERSION_TUPLE = (0, 2, 4)
|
|
PLUGIN_VERSION = '.'.join([str(x) for x in PLUGIN_VERSION_TUPLE])
|
|
# Include an html helpfile in the plugin's zipfile with the following name.
|
|
RESOURCE_NAME = PLUGIN_NAME + '_Help.htm'
|
|
|
|
import sys, os, zlib, re
|
|
from zipfile import ZipFile, ZIP_STORED, ZIP_DEFLATED
|
|
from zipfile import ZipInfo as _ZipInfo
|
|
#from lxml import etree
|
|
try:
|
|
import xml.etree.cElementTree as etree
|
|
except ImportError:
|
|
import xml.etree.ElementTree as etree
|
|
from contextlib import closing
|
|
|
|
global AES
|
|
|
|
META_NAMES = ('mimetype', 'META-INF/rights.xml', 'META-INF/encryption.xml')
|
|
NSMAP = {'adept': 'http://ns.adobe.com/adept',
|
|
'enc': 'http://www.w3.org/2001/04/xmlenc#'}
|
|
|
|
class IGNOBLEError(Exception):
|
|
pass
|
|
|
|
def _load_crypto_libcrypto():
|
|
from ctypes import CDLL, POINTER, c_void_p, c_char_p, c_int, c_long, \
|
|
Structure, c_ulong, create_string_buffer, cast
|
|
from ctypes.util import find_library
|
|
|
|
if sys.platform.startswith('win'):
|
|
libcrypto = find_library('libeay32')
|
|
else:
|
|
libcrypto = find_library('crypto')
|
|
if libcrypto is None:
|
|
raise IGNOBLEError('%s Plugin v%s: libcrypto not found' % (PLUGIN_NAME, PLUGIN_VERSION))
|
|
libcrypto = CDLL(libcrypto)
|
|
|
|
AES_MAXNR = 14
|
|
|
|
c_char_pp = POINTER(c_char_p)
|
|
c_int_p = POINTER(c_int)
|
|
|
|
class AES_KEY(Structure):
|
|
_fields_ = [('rd_key', c_long * (4 * (AES_MAXNR + 1))),
|
|
('rounds', c_int)]
|
|
AES_KEY_p = POINTER(AES_KEY)
|
|
|
|
def F(restype, name, argtypes):
|
|
func = getattr(libcrypto, name)
|
|
func.restype = restype
|
|
func.argtypes = argtypes
|
|
return func
|
|
|
|
AES_set_decrypt_key = F(c_int, 'AES_set_decrypt_key',
|
|
[c_char_p, c_int, AES_KEY_p])
|
|
AES_cbc_encrypt = F(None, 'AES_cbc_encrypt',
|
|
[c_char_p, c_char_p, c_ulong, AES_KEY_p, c_char_p,
|
|
c_int])
|
|
|
|
class AES(object):
|
|
def __init__(self, userkey):
|
|
self._blocksize = len(userkey)
|
|
if (self._blocksize != 16) and (self._blocksize != 24) and (self._blocksize != 32) :
|
|
raise IGNOBLEError('%s Plugin v%s: AES improper key used' % (PLUGIN_NAME, PLUGIN_VERSION))
|
|
return
|
|
key = self._key = AES_KEY()
|
|
rv = AES_set_decrypt_key(userkey, len(userkey) * 8, key)
|
|
if rv < 0:
|
|
raise IGNOBLEError('%s Plugin v%s: Failed to initialize AES key' % (PLUGIN_NAME, PLUGIN_VERSION))
|
|
|
|
def decrypt(self, data):
|
|
out = create_string_buffer(len(data))
|
|
iv = ("\x00" * self._blocksize)
|
|
rv = AES_cbc_encrypt(data, out, len(data), self._key, iv, 0)
|
|
if rv == 0:
|
|
raise IGNOBLEError('%s Plugin v%s: AES decryption failed' % (PLUGIN_NAME, PLUGIN_VERSION))
|
|
return out.raw
|
|
|
|
print '%s Plugin v%s: Using libcrypto.' %(PLUGIN_NAME, PLUGIN_VERSION)
|
|
return AES
|
|
|
|
def _load_crypto_pycrypto():
|
|
from Crypto.Cipher import AES as _AES
|
|
|
|
class AES(object):
|
|
def __init__(self, key):
|
|
self._aes = _AES.new(key, _AES.MODE_CBC, '\x00'*16)
|
|
|
|
def decrypt(self, data):
|
|
return self._aes.decrypt(data)
|
|
|
|
print '%s Plugin v%s: Using PyCrypto.' %(PLUGIN_NAME, PLUGIN_VERSION)
|
|
return AES
|
|
|
|
def _load_crypto():
|
|
_aes = None
|
|
cryptolist = (_load_crypto_libcrypto, _load_crypto_pycrypto)
|
|
if sys.platform.startswith('win'):
|
|
cryptolist = (_load_crypto_pycrypto, _load_crypto_libcrypto)
|
|
for loader in cryptolist:
|
|
try:
|
|
_aes = loader()
|
|
break
|
|
except (ImportError, IGNOBLEError):
|
|
pass
|
|
return _aes
|
|
|
|
class ZipInfo(_ZipInfo):
|
|
def __init__(self, *args, **kwargs):
|
|
if 'compress_type' in kwargs:
|
|
compress_type = kwargs.pop('compress_type')
|
|
super(ZipInfo, self).__init__(*args, **kwargs)
|
|
self.compress_type = compress_type
|
|
|
|
class Decryptor(object):
|
|
def __init__(self, bookkey, encryption):
|
|
enc = lambda tag: '{%s}%s' % (NSMAP['enc'], tag)
|
|
self._aes = AES(bookkey)
|
|
encryption = etree.fromstring(encryption)
|
|
self._encrypted = encrypted = set()
|
|
expr = './%s/%s/%s' % (enc('EncryptedData'), enc('CipherData'),
|
|
enc('CipherReference'))
|
|
for elem in encryption.findall(expr):
|
|
path = elem.get('URI', None)
|
|
path = path.encode('utf-8')
|
|
if path is not None:
|
|
encrypted.add(path)
|
|
|
|
def decompress(self, bytes):
|
|
dc = zlib.decompressobj(-15)
|
|
bytes = dc.decompress(bytes)
|
|
ex = dc.decompress('Z') + dc.flush()
|
|
if ex:
|
|
bytes = bytes + ex
|
|
return bytes
|
|
|
|
def decrypt(self, path, data):
|
|
if path in self._encrypted:
|
|
data = self._aes.decrypt(data)[16:]
|
|
data = data[:-ord(data[-1])]
|
|
data = self.decompress(data)
|
|
return data
|
|
|
|
def plugin_main(userkey, inpath, outpath):
|
|
key = userkey.decode('base64')[:16]
|
|
aes = AES(key)
|
|
|
|
with closing(ZipFile(open(inpath, 'rb'))) as inf:
|
|
namelist = set(inf.namelist())
|
|
if 'META-INF/rights.xml' not in namelist or 'META-INF/encryption.xml' not in namelist:
|
|
print '%s Plugin: Not Encrypted.' % PLUGIN_NAME
|
|
return 1
|
|
for name in META_NAMES:
|
|
namelist.remove(name)
|
|
try: # If the generated keyfile doesn't match the bookkey, this is where it's likely to blow up.
|
|
rights = etree.fromstring(inf.read('META-INF/rights.xml'))
|
|
adept = lambda tag: '{%s}%s' % (NSMAP['adept'], tag)
|
|
expr = './/%s' % (adept('encryptedKey'),)
|
|
bookkey = ''.join(rights.findtext(expr))
|
|
bookkey = aes.decrypt(bookkey.decode('base64'))
|
|
bookkey = bookkey[:-ord(bookkey[-1])]
|
|
encryption = inf.read('META-INF/encryption.xml')
|
|
decryptor = Decryptor(bookkey[-16:], encryption)
|
|
kwds = dict(compression=ZIP_DEFLATED, allowZip64=False)
|
|
with closing(ZipFile(open(outpath, 'wb'), 'w', **kwds)) as outf:
|
|
zi = ZipInfo('mimetype', compress_type=ZIP_STORED)
|
|
outf.writestr(zi, inf.read('mimetype'))
|
|
for path in namelist:
|
|
data = inf.read(path)
|
|
outf.writestr(path, decryptor.decrypt(path, data))
|
|
except:
|
|
return 2
|
|
return 0
|
|
|
|
from calibre.customize import FileTypePlugin
|
|
from calibre.gui2 import is_ok_to_use_qt
|
|
|
|
class IgnobleDeDRM(FileTypePlugin):
|
|
name = PLUGIN_NAME
|
|
description = 'Removes DRM from secure Barnes & Noble epub files. Credit given to I ♥ Cabbages for the original stand-alone scripts.'
|
|
supported_platforms = ['linux', 'osx', 'windows']
|
|
author = 'DiapDealer'
|
|
version = PLUGIN_VERSION_TUPLE
|
|
minimum_calibre_version = (0, 7, 55) # Compiled python libraries cannot be imported in earlier versions.
|
|
file_types = set(['epub'])
|
|
on_import = True
|
|
|
|
def run(self, path_to_ebook):
|
|
from calibre_plugins.ignoble_epub import outputfix
|
|
|
|
if sys.stdout.encoding == None:
|
|
sys.stdout = outputfix.getwriter('utf-8')(sys.stdout)
|
|
else:
|
|
sys.stdout = outputfix.getwriter(sys.stdout.encoding)(sys.stdout)
|
|
if sys.stderr.encoding == None:
|
|
sys.stderr = outputfix.getwriter('utf-8')(sys.stderr)
|
|
else:
|
|
sys.stderr = outputfix.getwriter(sys.stderr.encoding)(sys.stderr)
|
|
|
|
global AES
|
|
|
|
print '\n\nRunning {0} v{1} on "{2}"'.format(PLUGIN_NAME, PLUGIN_VERSION, os.path.basename(path_to_ebook))
|
|
AES = _load_crypto()
|
|
if AES == None:
|
|
# Failed to load libcrypto or PyCrypto... Adobe Epubs can't be decrypted.'
|
|
raise Exception('%s Plugin v%s: Failed to load crypto libs.' % (PLUGIN_NAME, PLUGIN_VERSION))
|
|
|
|
# First time use or first time after upgrade to new key-handling/storage method
|
|
# or no keys configured. Give a visual prompt to configure.
|
|
import calibre_plugins.ignoble_epub.config as cfg
|
|
if not cfg.prefs['configured']:
|
|
titlemsg = '%s v%s' % (PLUGIN_NAME, PLUGIN_VERSION)
|
|
errmsg = titlemsg + ' not (properly) configured!\n' + \
|
|
'\nThis may be the first time you\'ve used this plugin' + \
|
|
' (or the first time since upgrading this plugin).' + \
|
|
' You\'ll need to open the customization dialog (Preferences->Plugins->File type plugins)' + \
|
|
' and follow the instructions there.\n' + \
|
|
'\nIf you don\'t use the ' + PLUGIN_NAME + ' plugin, you should disable or uninstall it.'
|
|
if is_ok_to_use_qt():
|
|
from PyQt4.Qt import QMessageBox
|
|
d = QMessageBox(QMessageBox.Warning, titlemsg, errmsg )
|
|
d.show()
|
|
d.raise_()
|
|
d.exec_()
|
|
raise Exception('%s Plugin v%s: Plugin not configured.' % (PLUGIN_NAME, PLUGIN_VERSION))
|
|
|
|
# Check original epub archive for zip errors.
|
|
from calibre_plugins.ignoble_epub import zipfix
|
|
inf = self.temporary_file('.epub')
|
|
try:
|
|
print '%s Plugin: Verifying zip archive integrity.' % PLUGIN_NAME
|
|
fr = zipfix.fixZip(path_to_ebook, inf.name)
|
|
fr.fix()
|
|
except Exception, e:
|
|
print '%s Plugin: unforeseen zip archive issue.' % PLUGIN_NAME
|
|
raise Exception(e)
|
|
# Create a TemporaryPersistent file to work with.
|
|
of = self.temporary_file('.epub')
|
|
|
|
# Attempt to decrypt epub with each encryption key (generated or provided).
|
|
key_counter = 1
|
|
for keyname, userkey in cfg.prefs['keys'].items():
|
|
keyname_masked = keyname[:4] + ''.join('x' for x in keyname[4:])
|
|
# Give the user key, ebook and TemporaryPersistent file to the Stripper function.
|
|
result = plugin_main(userkey, inf.name, of.name)
|
|
|
|
# Ebook is not a B&N Adept epub... do nothing and pass it on.
|
|
# This allows a non-encrypted epub to be imported without error messages.
|
|
if result == 1:
|
|
print '%s Plugin: Not a B&N Epub - doing nothing.\n' % PLUGIN_NAME
|
|
of.close()
|
|
return path_to_ebook
|
|
break
|
|
|
|
# Decryption was successful return the modified PersistentTemporary
|
|
# file to Calibre's import process.
|
|
if result == 0:
|
|
print '{0} Plugin: Encryption key {1} ("{2}") correct!'.format(PLUGIN_NAME, key_counter, keyname_masked)
|
|
of.close()
|
|
return of.name
|
|
break
|
|
|
|
print '{0} Plugin: Encryption key {1} ("{2}") incorrect!'.format(PLUGIN_NAME, key_counter, keyname_masked)
|
|
key_counter += 1
|
|
|
|
# Something went wrong with decryption.
|
|
# Import the original unmolested epub.
|
|
of.close
|
|
raise Exception('%s Plugin v%s: Ultimately failed to decrypt.\n' % (PLUGIN_NAME, PLUGIN_VERSION))
|
|
|
|
def is_customizable(self):
|
|
# return true to allow customization via the Plugin->Preferences.
|
|
return True
|
|
|
|
def config_widget(self):
|
|
from calibre_plugins.ignoble_epub.config import ConfigWidget
|
|
# Extract the helpfile contents from in the plugin's zipfile.
|
|
# The helpfile must be named <plugin name variable> + '_Help.htm'
|
|
return ConfigWidget(self.load_resources(RESOURCE_NAME)[RESOURCE_NAME])
|
|
|
|
def load_resources(self, names):
|
|
ans = {}
|
|
with ZipFile(self.plugin_path, 'r') as zf:
|
|
for candidate in zf.namelist():
|
|
if candidate in names:
|
|
ans[candidate] = zf.read(candidate)
|
|
return ans
|
|
|
|
def save_settings(self, config_widget):
|
|
config_widget.save_settings()
|