mirror of
https://github.com/noDRM/DeDRM_tools.git
synced 2024-09-29 03:26:10 +06:00
342 lines
14 KiB
Python
342 lines
14 KiB
Python
#!/usr/bin/env python
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# vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
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# -*- coding: utf-8 -*-
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from __future__ import with_statement
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__license__ = 'GPL v3'
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__docformat__ = 'restructuredtext en'
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# Released under the terms of the GNU General Public Licence, version 3 or
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# later. <http://www.gnu.org/licenses/>
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#
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# Requires Calibre version 0.7.55 or higher.
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#
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# All credit given to I ♥ Cabbages for the original standalone scripts.
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# I had the much easier job of converting them to Calibre a plugin.
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#
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# This plugin is meant to decrypt Barnes & Noble Epubs that are protected
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# with a version of Adobe's Adept encryption. It is meant to function without having to
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# install any dependencies... other than having Calibre installed, of course. It will still
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# work if you have Python and PyCrypto already installed, but they aren't necessary.
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#
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# Configuration:
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# Check out the plugin's configuration settings by clicking the "Customize plugin"
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# button when you have the "BnN ePub DeDRM" plugin highlighted (under Preferences->
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# Plugins->File type plugins). Once you have the configuration dialog open, you'll
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# see a Help link on the top right-hand side.
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#
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# Revision history:
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# 0.1.0 - Initial release
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# 0.1.1 - Allow Windows users to make use of openssl if they have it installed.
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# - Incorporated SomeUpdates zipfix routine.
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# 0.1.2 - bug fix for non-ascii file names in encryption.xml
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# 0.1.3 - Try PyCrypto on Windows first
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# 0.1.4 - update zipfix to deal with mimetype not in correct place
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# 0.1.5 - update zipfix to deal with completely missing mimetype files
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# 0.1.6 - update for the new calibre plugin interface
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# 0.1.7 - Fix for potential problem with PyCrypto
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# 0.1.8 - an updated/modified zipfix.py and included zipfilerugged.py
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# 0.2.0 - Completely overhauled plugin configuration dialog and key management/storage
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# 0.2.1 - an updated/modified zipfix.py and included zipfilerugged.py
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# 0.2.2 - added in potential fixes from 0.1.7 that had been missed.
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# 0.2.3 - fixed possible output/unicode problem
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# 0.2.4 - ditched nearly hopeless caselessStrCmp method in favor of uStrCmp.
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# - added ability to rename existing keys.
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"""
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Decrypt Barnes & Noble ADEPT encrypted EPUB books.
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"""
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PLUGIN_NAME = 'Ignoble Epub DeDRM'
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PLUGIN_VERSION_TUPLE = (0, 2, 4)
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PLUGIN_VERSION = '.'.join([str(x) for x in PLUGIN_VERSION_TUPLE])
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# Include an html helpfile in the plugin's zipfile with the following name.
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RESOURCE_NAME = PLUGIN_NAME + '_Help.htm'
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import sys, os, zlib, re
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from zipfile import ZipFile, ZIP_STORED, ZIP_DEFLATED
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from zipfile import ZipInfo as _ZipInfo
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#from lxml import etree
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try:
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import xml.etree.cElementTree as etree
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except ImportError:
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import xml.etree.ElementTree as etree
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from contextlib import closing
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global AES
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META_NAMES = ('mimetype', 'META-INF/rights.xml', 'META-INF/encryption.xml')
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NSMAP = {'adept': 'http://ns.adobe.com/adept',
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'enc': 'http://www.w3.org/2001/04/xmlenc#'}
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class IGNOBLEError(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 IGNOBLEError('%s Plugin v%s: libcrypto not found' % (PLUGIN_NAME, PLUGIN_VERSION))
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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_cbc_encrypt = F(None, 'AES_cbc_encrypt',
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[c_char_p, c_char_p, c_ulong, AES_KEY_p, c_char_p,
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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 IGNOBLEError('%s Plugin v%s: AES improper key used' % (PLUGIN_NAME, PLUGIN_VERSION))
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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 IGNOBLEError('%s Plugin v%s: Failed to initialize AES key' % (PLUGIN_NAME, PLUGIN_VERSION))
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def decrypt(self, data):
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out = create_string_buffer(len(data))
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iv = ("\x00" * self._blocksize)
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rv = AES_cbc_encrypt(data, out, len(data), self._key, iv, 0)
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if rv == 0:
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raise IGNOBLEError('%s Plugin v%s: AES decryption failed' % (PLUGIN_NAME, PLUGIN_VERSION))
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return out.raw
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print '%s Plugin v%s: Using libcrypto.' %(PLUGIN_NAME, PLUGIN_VERSION)
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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_CBC, '\x00'*16)
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def decrypt(self, data):
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return self._aes.decrypt(data)
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print '%s Plugin v%s: Using PyCrypto.' %(PLUGIN_NAME, PLUGIN_VERSION)
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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_libcrypto, _load_crypto_pycrypto)
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if sys.platform.startswith('win'):
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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, IGNOBLEError):
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pass
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return _aes
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class ZipInfo(_ZipInfo):
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def __init__(self, *args, **kwargs):
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if 'compress_type' in kwargs:
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compress_type = kwargs.pop('compress_type')
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super(ZipInfo, self).__init__(*args, **kwargs)
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self.compress_type = compress_type
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class Decryptor(object):
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def __init__(self, bookkey, encryption):
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enc = lambda tag: '{%s}%s' % (NSMAP['enc'], tag)
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self._aes = AES(bookkey)
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encryption = etree.fromstring(encryption)
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self._encrypted = encrypted = set()
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expr = './%s/%s/%s' % (enc('EncryptedData'), enc('CipherData'),
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enc('CipherReference'))
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for elem in encryption.findall(expr):
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path = elem.get('URI', None)
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path = path.encode('utf-8')
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if path is not None:
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encrypted.add(path)
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def decompress(self, bytes):
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dc = zlib.decompressobj(-15)
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bytes = dc.decompress(bytes)
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ex = dc.decompress('Z') + dc.flush()
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if ex:
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bytes = bytes + ex
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return bytes
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def decrypt(self, path, data):
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if path in self._encrypted:
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data = self._aes.decrypt(data)[16:]
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data = data[:-ord(data[-1])]
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data = self.decompress(data)
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return data
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def plugin_main(userkey, inpath, outpath):
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key = userkey.decode('base64')[:16]
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aes = AES(key)
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with closing(ZipFile(open(inpath, 'rb'))) as inf:
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namelist = set(inf.namelist())
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if 'META-INF/rights.xml' not in namelist or 'META-INF/encryption.xml' not in namelist:
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print '%s Plugin: Not Encrypted.' % PLUGIN_NAME
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return 1
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for name in META_NAMES:
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namelist.remove(name)
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try: # If the generated keyfile doesn't match the bookkey, this is where it's likely to blow up.
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rights = etree.fromstring(inf.read('META-INF/rights.xml'))
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adept = lambda tag: '{%s}%s' % (NSMAP['adept'], tag)
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expr = './/%s' % (adept('encryptedKey'),)
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bookkey = ''.join(rights.findtext(expr))
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bookkey = aes.decrypt(bookkey.decode('base64'))
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bookkey = bookkey[:-ord(bookkey[-1])]
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encryption = inf.read('META-INF/encryption.xml')
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decryptor = Decryptor(bookkey[-16:], encryption)
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kwds = dict(compression=ZIP_DEFLATED, allowZip64=False)
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with closing(ZipFile(open(outpath, 'wb'), 'w', **kwds)) as outf:
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zi = ZipInfo('mimetype', compress_type=ZIP_STORED)
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outf.writestr(zi, inf.read('mimetype'))
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for path in namelist:
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data = inf.read(path)
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outf.writestr(path, decryptor.decrypt(path, data))
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except:
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return 2
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return 0
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from calibre.customize import FileTypePlugin
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from calibre.gui2 import is_ok_to_use_qt
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class IgnobleDeDRM(FileTypePlugin):
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name = PLUGIN_NAME
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description = 'Removes DRM from secure Barnes & Noble epub files. Credit given to I ♥ Cabbages for the original stand-alone scripts.'
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supported_platforms = ['linux', 'osx', 'windows']
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author = 'DiapDealer'
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version = PLUGIN_VERSION_TUPLE
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minimum_calibre_version = (0, 7, 55) # Compiled python libraries cannot be imported in earlier versions.
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file_types = set(['epub'])
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on_import = True
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def run(self, path_to_ebook):
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from calibre_plugins.ignoble_epub import outputfix
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if sys.stdout.encoding == None:
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sys.stdout = outputfix.getwriter('utf-8')(sys.stdout)
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else:
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sys.stdout = outputfix.getwriter(sys.stdout.encoding)(sys.stdout)
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if sys.stderr.encoding == None:
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sys.stderr = outputfix.getwriter('utf-8')(sys.stderr)
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else:
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sys.stderr = outputfix.getwriter(sys.stderr.encoding)(sys.stderr)
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global AES
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print '\n\nRunning {0} v{1} on "{2}"'.format(PLUGIN_NAME, PLUGIN_VERSION, os.path.basename(path_to_ebook))
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AES = _load_crypto()
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if AES == None:
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# Failed to load libcrypto or PyCrypto... Adobe Epubs can't be decrypted.'
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raise Exception('%s Plugin v%s: Failed to load crypto libs.' % (PLUGIN_NAME, PLUGIN_VERSION))
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# First time use or first time after upgrade to new key-handling/storage method
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# or no keys configured. Give a visual prompt to configure.
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import calibre_plugins.ignoble_epub.config as cfg
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if not cfg.prefs['configured']:
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titlemsg = '%s v%s' % (PLUGIN_NAME, PLUGIN_VERSION)
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errmsg = titlemsg + ' not (properly) configured!\n' + \
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'\nThis may be the first time you\'ve used this plugin' + \
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' (or the first time since upgrading this plugin).' + \
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' You\'ll need to open the customization dialog (Preferences->Plugins->File type plugins)' + \
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' and follow the instructions there.\n' + \
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'\nIf you don\'t use the ' + PLUGIN_NAME + ' plugin, you should disable or uninstall it.'
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if is_ok_to_use_qt():
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from PyQt4.Qt import QMessageBox
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d = QMessageBox(QMessageBox.Warning, titlemsg, errmsg )
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d.show()
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d.raise_()
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d.exec_()
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raise Exception('%s Plugin v%s: Plugin not configured.' % (PLUGIN_NAME, PLUGIN_VERSION))
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# Check original epub archive for zip errors.
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from calibre_plugins.ignoble_epub import zipfix
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inf = self.temporary_file('.epub')
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try:
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print '%s Plugin: Verifying zip archive integrity.' % PLUGIN_NAME
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fr = zipfix.fixZip(path_to_ebook, inf.name)
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fr.fix()
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except Exception, e:
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print '%s Plugin: unforeseen zip archive issue.' % PLUGIN_NAME
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raise Exception(e)
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# Create a TemporaryPersistent file to work with.
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of = self.temporary_file('.epub')
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# Attempt to decrypt epub with each encryption key (generated or provided).
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key_counter = 1
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for keyname, userkey in cfg.prefs['keys'].items():
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keyname_masked = keyname[:4] + ''.join('x' for x in keyname[4:])
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# Give the user key, ebook and TemporaryPersistent file to the Stripper function.
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result = plugin_main(userkey, inf.name, of.name)
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# Ebook is not a B&N Adept epub... do nothing and pass it on.
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# This allows a non-encrypted epub to be imported without error messages.
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if result == 1:
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print '%s Plugin: Not a B&N Epub - doing nothing.\n' % PLUGIN_NAME
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of.close()
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return path_to_ebook
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break
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# Decryption was successful return the modified PersistentTemporary
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# file to Calibre's import process.
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if result == 0:
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print '{0} Plugin: Encryption key {1} ("{2}") correct!'.format(PLUGIN_NAME, key_counter, keyname_masked)
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of.close()
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return of.name
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break
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print '{0} Plugin: Encryption key {1} ("{2}") incorrect!'.format(PLUGIN_NAME, key_counter, keyname_masked)
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key_counter += 1
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# Something went wrong with decryption.
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# Import the original unmolested epub.
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of.close
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raise Exception('%s Plugin v%s: Ultimately failed to decrypt.\n' % (PLUGIN_NAME, PLUGIN_VERSION))
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def is_customizable(self):
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# return true to allow customization via the Plugin->Preferences.
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return True
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def config_widget(self):
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from calibre_plugins.ignoble_epub.config import ConfigWidget
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# Extract the helpfile contents from in the plugin's zipfile.
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# The helpfile must be named <plugin name variable> + '_Help.htm'
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return ConfigWidget(self.load_resources(RESOURCE_NAME)[RESOURCE_NAME])
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def load_resources(self, names):
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ans = {}
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with ZipFile(self.plugin_path, 'r') as zf:
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for candidate in zf.namelist():
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if candidate in names:
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ans[candidate] = zf.read(candidate)
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return ans
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def save_settings(self, config_widget):
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config_widget.save_settings()
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