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Add B&N PDF DeDRM (untested), match UUID for Adobe PDFs

This commit is contained in:
NoDRM 2021-11-16 11:48:53 +01:00
parent b4c0e33b8b
commit 9c41716e5e
3 changed files with 95 additions and 12 deletions
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32
DeDRM_plugin/__init__.py
View File

@ -544,7 +544,7 @@ class DeDRM(FileTypePlugin):
# If we end up here, we didn't find a key with a matching UUID, so lets just try all of them.
# Attempt to decrypt epub with each encryption key (generated or provided).
# Attempt to decrypt PDF with each encryption key (generated or provided).
for keyname, userkeyhex in dedrmprefs['adeptkeys'].items():
userkey = codecs.decode(userkeyhex,'hex')
print("{0} v{1}: Trying encryption key {2:s}".format(PLUGIN_NAME, PLUGIN_VERSION, keyname))
@ -640,6 +640,36 @@ class DeDRM(FileTypePlugin):
except Exception as e:
pass
# Unable to decrypt the PDF with any of the existing keys. Is it a B&N PDF?
# Attempt to decrypt PDF with each encryption key (generated or provided).
for keyname, userkey in dedrmprefs['bandnkeys'].items():
keyname_masked = "".join(("X" if (x.isdigit()) else x) for x in keyname)
print("{0} v{1}: Trying Encryption key {2:s}".format(PLUGIN_NAME, PLUGIN_VERSION, keyname_masked))
of = self.temporary_file(".pdf")
# Give the user key, ebook and TemporaryPersistent file to the decryption function.
try:
result = ineptpdf.decryptBook(userkey, path_to_ebook, of.name, False)
except ineptpdf.ADEPTNewVersionError:
print("{0} v{1}: Book uses unsupported (too new) Adobe DRM.".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime))
return path_to_ebook
except:
print("{0} v{1}: Exception when decrypting after {2:.1f} seconds".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime))
traceback.print_exc()
result = 1
of.close()
if result == 0:
# Decryption was successful.
# Return the modified PersistentTemporary file to calibre.
print("{0} v{1}: Decrypted with key {2:s} after {3:.1f} seconds".format(PLUGIN_NAME, PLUGIN_VERSION,keyname,time.time()-self.starttime))
return of.name
print("{0} v{1}: Failed to decrypt with key {2:s} after {3:.1f} seconds".format(PLUGIN_NAME, PLUGIN_VERSION,keyname,time.time()-self.starttime))
# Something went wrong with decryption.
print("{0} v{1}: Ultimately failed to decrypt after {2:.1f} seconds. Read the FAQs at Harper's repository: https://github.com/apprenticeharper/DeDRM_tools/blob/master/FAQs.md".format(PLUGIN_NAME, PLUGIN_VERSION,time.time()-self.starttime))
raise DeDRMError("{0} v{1}: Ultimately failed to decrypt after {2:.1f} seconds. Read the FAQs at Harper's repository: https://github.com/apprenticeharper/DeDRM_tools/blob/master/FAQs.md".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime))

7
DeDRM_plugin/ignoblepdf.py
View File

@ -24,6 +24,7 @@ Decrypts Barnes & Noble encrypted PDF files.
__license__ = 'GPL v3'
__version__ = "0.3"
import codecs
import sys
import os
import re
@ -312,7 +313,7 @@ class PSLiteral(PSObject):
Use PSLiteralTable.intern() instead.
'''
def __init__(self, name):
self.name = name
self.name = name.decode('utf-8')
return
def __repr__(self):
@ -1448,7 +1449,7 @@ class PDFDocument(object):
self.decipher = self.decipher_rc4 # XXX may be AES
# aes
elif V == 4 and length == 128:
elf.decipher = self.decipher_aes
self.decipher = self.decipher_aes
elif V == 4 and length == 256:
raise PDFNotImplementedError('AES256 encryption is currently unsupported')
self.ready = True
@ -1491,7 +1492,7 @@ class PDFDocument(object):
# proper length unknown try with whatever you have
print("ebx_V is %d and ebx_type is %d" % (ebx_V, ebx_type))
print("length is %d and len(bookkey) is %d" % (length, len(bookkey)))
print("bookkey[0] is %d" % ord(bookkey[0]))
print("bookkey[0] is %d" % bookkey[0])
if ebx_V == 3:
V = 3
else:

68
DeDRM_plugin/ineptpdf.py
View File

@ -1488,7 +1488,7 @@ class PDFDocument(object):
# Perform the initialization with a given password.
# This step is mandatory even if there's no password associated
# with the document.
def initialize(self, password=b''):
def initialize(self, password=b'', inept=True):
if not self.encryption:
self.is_printable = self.is_modifiable = self.is_extractable = True
self.ready = True
@ -1500,8 +1500,11 @@ class PDFDocument(object):
return self.initialize_adobe_ps(password, docid, param)
if type == 'Standard':
return self.initialize_standard(password, docid, param)
if type == 'EBX_HANDLER':
return self.initialize_ebx(password, docid, param)
if type == 'EBX_HANDLER' and inept is True:
return self.initialize_ebx_inept(password, docid, param)
if type == 'EBX_HANDLER' and inept is False:
return self.initialize_ebx_ignoble(password, docid, param)
raise PDFEncryptionError('Unknown filter: param=%r' % param)
def initialize_adobe_ps(self, password, docid, param):
@ -1642,7 +1645,52 @@ class PDFDocument(object):
return True
def initialize_ebx(self, password, docid, param):
def initialize_ebx_ignoble(self, keyb64, docid, param):
self.is_printable = self.is_modifiable = self.is_extractable = True
key = keyb64.decode('base64')[:16]
aes = AES.new(key,AES.MODE_CBC,"\x00" * len(key))
length = int_value(param.get('Length', 0)) / 8
rights = str_value(param.get('ADEPT_LICENSE')).decode('base64')
rights = zlib.decompress(rights, -15)
rights = etree.fromstring(rights)
expr = './/{http://ns.adobe.com/adept}encryptedKey'
bookkey = ''.join(rights.findtext(expr)).decode('base64')
bookkey = aes.decrypt(bookkey)
bookkey = bookkey[:-ord(bookkey[-1])]
bookkey = bookkey[-16:]
ebx_V = int_value(param.get('V', 4))
ebx_type = int_value(param.get('EBX_ENCRYPTIONTYPE', 6))
# added because of improper booktype / decryption book session key errors
if length > 0:
if len(bookkey) == length:
if ebx_V == 3:
V = 3
else:
V = 2
elif len(bookkey) == length + 1:
V = bookkey[0]
bookkey = bookkey[1:]
else:
print("ebx_V is %d and ebx_type is %d" % (ebx_V, ebx_type))
print("length is %d and len(bookkey) is %d" % (length, len(bookkey)))
print("bookkey[0] is %d" % bookkey[0])
raise ADEPTError('error decrypting book session key - mismatched length')
else:
# proper length unknown try with whatever you have
print("ebx_V is %d and ebx_type is %d" % (ebx_V, ebx_type))
print("length is %d and len(bookkey) is %d" % (length, len(bookkey)))
print("bookkey[0] is %d" % ord(bookkey[0]))
if ebx_V == 3:
V = 3
else:
V = 2
self.decrypt_key = bookkey
self.genkey = self.genkey_v3 if V == 3 else self.genkey_v2
self.decipher = self.decrypt_rc4
self.ready = True
return
def initialize_ebx_inept(self, password, docid, param):
self.is_printable = self.is_modifiable = self.is_extractable = True
rsa = RSA(password)
length = int_value(param.get('Length', 0)) // 8
@ -2042,15 +2090,19 @@ class PDFObjStrmParser(PDFParser):
def adeptGetUserUUID(inf):
try:
doc = PDFDocument()
inf = open(inf, 'rb')
pars = PDFParser(doc, inf)
(docid, param) = doc.encryption
type = literal_name(param['Filter'])
if type != 'EBX_HANDLER':
# No EBX_HANDLER, no idea which user key can decrypt this.
inf.close()
return None
rights = codecs.decode(param.get('ADEPT_LICENSE'), 'base64')
inf.close()
rights = zlib.decompress(rights, -15)
rights = etree.fromstring(rights)
expr = './/{http://ns.adobe.com/adept}user'
@ -2066,14 +2118,14 @@ def adeptGetUserUUID(inf):
### My own code, for which there is none else to blame
class PDFSerializer(object):
def __init__(self, inf, userkey):
def __init__(self, inf, userkey, inept=True):
global GEN_XREF_STM, gen_xref_stm
gen_xref_stm = GEN_XREF_STM > 1
self.version = inf.read(8)
inf.seek(0)
self.doc = doc = PDFDocument()
parser = PDFParser(doc, inf)
doc.initialize(userkey)
doc.initialize(userkey, inept)
self.objids = objids = set()
for xref in reversed(doc.xrefs):
trailer = xref.trailer
@ -2263,11 +2315,11 @@ class PDFSerializer(object):
def decryptBook(userkey, inpath, outpath):
def decryptBook(userkey, inpath, outpath, inept=True):
if RSA is None:
raise ADEPTError("PyCryptodome or OpenSSL must be installed.")
with open(inpath, 'rb') as inf:
serializer = PDFSerializer(inf, userkey)
serializer = PDFSerializer(inf, userkey, inept)
with open(outpath, 'wb') as outf:
# help construct to make sure the method runs to the end
try: