mirror of
https://github.com/noDRM/DeDRM_tools.git
synced 2025-10-23 23:07:47 -04:00
452 lines
17 KiB
Python
452 lines
17 KiB
Python
#!/usr/bin/env python
|
||
# -*- coding: utf-8 -*-
|
||
|
||
from __future__ import with_statement
|
||
|
||
# ignobleepub.pyw, version 3.8
|
||
# Copyright © 2009-2010 by i♥cabbages
|
||
|
||
# Released under the terms of the GNU General Public Licence, version 3
|
||
# <http://www.gnu.org/licenses/>
|
||
|
||
# Modified 2010–2013 by some_updates, DiapDealer and Apprentice Alf
|
||
|
||
# Windows users: Before running this program, you must first install Python 2.6
|
||
# from <http://www.python.org/download/> and PyCrypto from
|
||
# <http://www.voidspace.org.uk/python/modules.shtml#pycrypto> (make sure to
|
||
# install the version for Python 2.6). Save this script file as
|
||
# ineptepub.pyw and double-click on it to run it.
|
||
#
|
||
# Mac OS X users: Save this script file as ineptepub.pyw. You can run this
|
||
# program from the command line (pythonw ineptepub.pyw) or by double-clicking
|
||
# it when it has been associated with PythonLauncher.
|
||
|
||
# Revision history:
|
||
# 1 - Initial release
|
||
# 2 - Added OS X support by using OpenSSL when available
|
||
# 3 - screen out improper key lengths to prevent segfaults on Linux
|
||
# 3.1 - Allow Windows versions of libcrypto to be found
|
||
# 3.2 - add support for encoding to 'utf-8' when building up list of files to decrypt from encryption.xml
|
||
# 3.3 - On Windows try PyCrypto first, OpenSSL next
|
||
# 3.4 - Modify interface to allow use with import
|
||
# 3.5 - Fix for potential problem with PyCrypto
|
||
# 3.6 - Revised to allow use in calibre plugins to eliminate need for duplicate code
|
||
# 3.7 - Tweaked to match ineptepub more closely
|
||
# 3.8 - Fixed to retain zip file metadata (e.g. file modification date)
|
||
# 3.9 - moved unicode_argv call inside main for Windows DeDRM compatibility
|
||
# 4.0 - Work if TkInter is missing
|
||
|
||
"""
|
||
Decrypt Barnes & Noble encrypted ePub books.
|
||
"""
|
||
|
||
__license__ = 'GPL v3'
|
||
__version__ = "4.0"
|
||
|
||
import sys
|
||
import os
|
||
import traceback
|
||
import zlib
|
||
import zipfile
|
||
from zipfile import ZipInfo, ZipFile, ZIP_STORED, ZIP_DEFLATED
|
||
from contextlib import closing
|
||
import xml.etree.ElementTree as etree
|
||
|
||
# Wrap a stream so that output gets flushed immediately
|
||
# and also make sure that any unicode strings get
|
||
# encoded using "replace" before writing them.
|
||
class SafeUnbuffered:
|
||
def __init__(self, stream):
|
||
self.stream = stream
|
||
self.encoding = stream.encoding
|
||
if self.encoding == None:
|
||
self.encoding = "utf-8"
|
||
def write(self, data):
|
||
if isinstance(data,unicode):
|
||
data = data.encode(self.encoding,"replace")
|
||
self.stream.write(data)
|
||
self.stream.flush()
|
||
def __getattr__(self, attr):
|
||
return getattr(self.stream, attr)
|
||
|
||
try:
|
||
from calibre.constants import iswindows, isosx
|
||
except:
|
||
iswindows = sys.platform.startswith('win')
|
||
isosx = sys.platform.startswith('darwin')
|
||
|
||
def unicode_argv():
|
||
if iswindows:
|
||
# Uses shell32.GetCommandLineArgvW to get sys.argv as a list of Unicode
|
||
# strings.
|
||
|
||
# Versions 2.x of Python don't support Unicode in sys.argv on
|
||
# Windows, with the underlying Windows API instead replacing multi-byte
|
||
# characters with '?'.
|
||
|
||
|
||
from ctypes import POINTER, byref, cdll, c_int, windll
|
||
from ctypes.wintypes import LPCWSTR, LPWSTR
|
||
|
||
GetCommandLineW = cdll.kernel32.GetCommandLineW
|
||
GetCommandLineW.argtypes = []
|
||
GetCommandLineW.restype = LPCWSTR
|
||
|
||
CommandLineToArgvW = windll.shell32.CommandLineToArgvW
|
||
CommandLineToArgvW.argtypes = [LPCWSTR, POINTER(c_int)]
|
||
CommandLineToArgvW.restype = POINTER(LPWSTR)
|
||
|
||
cmd = GetCommandLineW()
|
||
argc = c_int(0)
|
||
argv = CommandLineToArgvW(cmd, byref(argc))
|
||
if argc.value > 0:
|
||
# Remove Python executable and commands if present
|
||
start = argc.value - len(sys.argv)
|
||
return [argv[i] for i in
|
||
xrange(start, argc.value)]
|
||
return [u"ineptepub.py"]
|
||
else:
|
||
argvencoding = sys.stdin.encoding
|
||
if argvencoding == None:
|
||
argvencoding = "utf-8"
|
||
return [arg if (type(arg) == unicode) else unicode(arg,argvencoding) for arg in sys.argv]
|
||
|
||
|
||
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 iswindows:
|
||
libcrypto = find_library('libeay32')
|
||
else:
|
||
libcrypto = find_library('crypto')
|
||
|
||
if libcrypto is None:
|
||
raise IGNOBLEError('libcrypto not found')
|
||
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('AES improper key used')
|
||
return
|
||
key = self._key = AES_KEY()
|
||
rv = AES_set_decrypt_key(userkey, len(userkey) * 8, key)
|
||
if rv < 0:
|
||
raise IGNOBLEError('Failed to initialize AES key')
|
||
|
||
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('AES decryption failed')
|
||
return out.raw
|
||
|
||
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)
|
||
|
||
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
|
||
|
||
AES = _load_crypto()
|
||
|
||
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 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)
|
||
if path is not None:
|
||
path = path.encode('utf-8')
|
||
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
|
||
|
||
# check file to make check whether it's probably an Adobe Adept encrypted ePub
|
||
def ignobleBook(inpath):
|
||
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:
|
||
return False
|
||
try:
|
||
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))
|
||
if len(bookkey) == 64:
|
||
return True
|
||
except:
|
||
# if we couldn't check, assume it is
|
||
return True
|
||
return False
|
||
|
||
def decryptBook(keyb64, inpath, outpath):
|
||
if AES is None:
|
||
raise IGNOBLEError(u"PyCrypto or OpenSSL must be installed.")
|
||
key = keyb64.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 u"{0:s} is DRM-free.".format(os.path.basename(inpath))
|
||
return 1
|
||
for name in META_NAMES:
|
||
namelist.remove(name)
|
||
try:
|
||
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))
|
||
if len(bookkey) != 64:
|
||
print u"{0:s} is not a secure Barnes & Noble ePub.".format(os.path.basename(inpath))
|
||
return 1
|
||
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')
|
||
zi.compress_type=ZIP_STORED
|
||
try:
|
||
# if the mimetype is present, get its info, including time-stamp
|
||
oldzi = inf.getinfo('mimetype')
|
||
# copy across fields to be preserved
|
||
zi.date_time = oldzi.date_time
|
||
zi.comment = oldzi.comment
|
||
zi.extra = oldzi.extra
|
||
zi.internal_attr = oldzi.internal_attr
|
||
# external attributes are dependent on the create system, so copy both.
|
||
zi.external_attr = oldzi.external_attr
|
||
zi.create_system = oldzi.create_system
|
||
except:
|
||
pass
|
||
outf.writestr(zi, inf.read('mimetype'))
|
||
for path in namelist:
|
||
data = inf.read(path)
|
||
zi = ZipInfo(path)
|
||
zi.compress_type=ZIP_DEFLATED
|
||
try:
|
||
# get the file info, including time-stamp
|
||
oldzi = inf.getinfo(path)
|
||
# copy across useful fields
|
||
zi.date_time = oldzi.date_time
|
||
zi.comment = oldzi.comment
|
||
zi.extra = oldzi.extra
|
||
zi.internal_attr = oldzi.internal_attr
|
||
# external attributes are dependent on the create system, so copy both.
|
||
zi.external_attr = oldzi.external_attr
|
||
zi.create_system = oldzi.create_system
|
||
except:
|
||
pass
|
||
outf.writestr(zi, decryptor.decrypt(path, data))
|
||
except:
|
||
print u"Could not decrypt {0:s} because of an exception:\n{1:s}".format(os.path.basename(inpath), traceback.format_exc())
|
||
return 2
|
||
return 0
|
||
|
||
|
||
def cli_main():
|
||
sys.stdout=SafeUnbuffered(sys.stdout)
|
||
sys.stderr=SafeUnbuffered(sys.stderr)
|
||
argv=unicode_argv()
|
||
progname = os.path.basename(argv[0])
|
||
if len(argv) != 4:
|
||
print u"usage: {0} <keyfile.b64> <inbook.epub> <outbook.epub>".format(progname)
|
||
return 1
|
||
keypath, inpath, outpath = argv[1:]
|
||
userkey = open(keypath,'rb').read()
|
||
result = decryptBook(userkey, inpath, outpath)
|
||
if result == 0:
|
||
print u"Successfully decrypted {0:s} as {1:s}".format(os.path.basename(inpath),os.path.basename(outpath))
|
||
return result
|
||
|
||
def gui_main():
|
||
try:
|
||
import Tkinter
|
||
import Tkconstants
|
||
import tkMessageBox
|
||
import traceback
|
||
except:
|
||
return cli_main()
|
||
|
||
class DecryptionDialog(Tkinter.Frame):
|
||
def __init__(self, root):
|
||
Tkinter.Frame.__init__(self, root, border=5)
|
||
self.status = Tkinter.Label(self, text=u"Select files for decryption")
|
||
self.status.pack(fill=Tkconstants.X, expand=1)
|
||
body = Tkinter.Frame(self)
|
||
body.pack(fill=Tkconstants.X, expand=1)
|
||
sticky = Tkconstants.E + Tkconstants.W
|
||
body.grid_columnconfigure(1, weight=2)
|
||
Tkinter.Label(body, text=u"Key file").grid(row=0)
|
||
self.keypath = Tkinter.Entry(body, width=30)
|
||
self.keypath.grid(row=0, column=1, sticky=sticky)
|
||
if os.path.exists(u"bnepubkey.b64"):
|
||
self.keypath.insert(0, u"bnepubkey.b64")
|
||
button = Tkinter.Button(body, text=u"...", command=self.get_keypath)
|
||
button.grid(row=0, column=2)
|
||
Tkinter.Label(body, text=u"Input file").grid(row=1)
|
||
self.inpath = Tkinter.Entry(body, width=30)
|
||
self.inpath.grid(row=1, column=1, sticky=sticky)
|
||
button = Tkinter.Button(body, text=u"...", command=self.get_inpath)
|
||
button.grid(row=1, column=2)
|
||
Tkinter.Label(body, text=u"Output file").grid(row=2)
|
||
self.outpath = Tkinter.Entry(body, width=30)
|
||
self.outpath.grid(row=2, column=1, sticky=sticky)
|
||
button = Tkinter.Button(body, text=u"...", command=self.get_outpath)
|
||
button.grid(row=2, column=2)
|
||
buttons = Tkinter.Frame(self)
|
||
buttons.pack()
|
||
botton = Tkinter.Button(
|
||
buttons, text=u"Decrypt", width=10, command=self.decrypt)
|
||
botton.pack(side=Tkconstants.LEFT)
|
||
Tkinter.Frame(buttons, width=10).pack(side=Tkconstants.LEFT)
|
||
button = Tkinter.Button(
|
||
buttons, text=u"Quit", width=10, command=self.quit)
|
||
button.pack(side=Tkconstants.RIGHT)
|
||
|
||
def get_keypath(self):
|
||
keypath = tkFileDialog.askopenfilename(
|
||
parent=None, title=u"Select Barnes & Noble \'.b64\' key file",
|
||
defaultextension=u".b64",
|
||
filetypes=[('base64-encoded files', '.b64'),
|
||
('All Files', '.*')])
|
||
if keypath:
|
||
keypath = os.path.normpath(keypath)
|
||
self.keypath.delete(0, Tkconstants.END)
|
||
self.keypath.insert(0, keypath)
|
||
return
|
||
|
||
def get_inpath(self):
|
||
inpath = tkFileDialog.askopenfilename(
|
||
parent=None, title=u"Select B&N-encrypted ePub file to decrypt",
|
||
defaultextension=u".epub", filetypes=[('ePub files', '.epub')])
|
||
if inpath:
|
||
inpath = os.path.normpath(inpath)
|
||
self.inpath.delete(0, Tkconstants.END)
|
||
self.inpath.insert(0, inpath)
|
||
return
|
||
|
||
def get_outpath(self):
|
||
outpath = tkFileDialog.asksaveasfilename(
|
||
parent=None, title=u"Select unencrypted ePub file to produce",
|
||
defaultextension=u".epub", filetypes=[('ePub files', '.epub')])
|
||
if outpath:
|
||
outpath = os.path.normpath(outpath)
|
||
self.outpath.delete(0, Tkconstants.END)
|
||
self.outpath.insert(0, outpath)
|
||
return
|
||
|
||
def decrypt(self):
|
||
keypath = self.keypath.get()
|
||
inpath = self.inpath.get()
|
||
outpath = self.outpath.get()
|
||
if not keypath or not os.path.exists(keypath):
|
||
self.status['text'] = u"Specified key file does not exist"
|
||
return
|
||
if not inpath or not os.path.exists(inpath):
|
||
self.status['text'] = u"Specified input file does not exist"
|
||
return
|
||
if not outpath:
|
||
self.status['text'] = u"Output file not specified"
|
||
return
|
||
if inpath == outpath:
|
||
self.status['text'] = u"Must have different input and output files"
|
||
return
|
||
userkey = open(keypath,'rb').read()
|
||
self.status['text'] = u"Decrypting..."
|
||
try:
|
||
decrypt_status = decryptBook(userkey, inpath, outpath)
|
||
except Exception, e:
|
||
self.status['text'] = u"Error: {0}".format(e.args[0])
|
||
return
|
||
if decrypt_status == 0:
|
||
self.status['text'] = u"File successfully decrypted"
|
||
else:
|
||
self.status['text'] = u"The was an error decrypting the file."
|
||
|
||
root = Tkinter.Tk()
|
||
root.title(u"Barnes & Noble ePub Decrypter v.{0}".format(__version__))
|
||
root.resizable(True, False)
|
||
root.minsize(300, 0)
|
||
DecryptionDialog(root).pack(fill=Tkconstants.X, expand=1)
|
||
root.mainloop()
|
||
return 0
|
||
|
||
if __name__ == '__main__':
|
||
if len(sys.argv) > 1:
|
||
sys.exit(cli_main())
|
||
sys.exit(gui_main())
|