mirror of
https://github.com/noDRM/DeDRM_tools.git
synced 2024-11-05 05:26:09 +06:00
1778 lines
56 KiB
Python
1778 lines
56 KiB
Python
#! /usr/bin/python
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# ineptpdf.pyw, version 6
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# To run this program install Python 2.6 from http://www.python.org/download/
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# and PyCrypto from http://www.voidspace.org.uk/python/modules.shtml#pycrypto
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# (make sure to install the version for Python 2.6). Save this script file as
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# ineptpdf.pyw and double-click on it to run it.
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# Revision history:
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# 1 - Initial release
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# 2 - Improved determination of key-generation algorithm
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# 3 - Correctly handle PDF >=1.5 cross-reference streams
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# 4 - Removal of ciando's personal ID (anon)
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# 5 - removing small bug with V3 ebooks (anon)
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# 6 - changed to adeptkey4.der format for 1.7.2 support (anon)
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"""
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Decrypt Adobe ADEPT-encrypted PDF files.
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"""
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from __future__ import with_statement
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__license__ = 'GPL v3'
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import sys
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import os
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import re
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import zlib
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import struct
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import hashlib
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from itertools import chain, islice
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import xml.etree.ElementTree as etree
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import Tkinter
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import Tkconstants
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import tkFileDialog
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import tkMessageBox
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import pickle
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try:
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from Crypto.Cipher import ARC4
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from Crypto.PublicKey import RSA
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except ImportError:
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ARC4 = None
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RSA = None
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class ADEPTError(Exception):
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pass
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###
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### ASN.1 parsing code from tlslite
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def bytesToNumber(bytes):
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total = 0L
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for byte in bytes:
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total = (total << 8) + byte
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return total
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class ASN1Error(Exception):
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pass
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class ASN1Parser(object):
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class Parser(object):
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def __init__(self, bytes):
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self.bytes = bytes
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self.index = 0
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def get(self, length):
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if self.index + length > len(self.bytes):
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raise ASN1Error("Error decoding ASN.1")
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x = 0
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for count in range(length):
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x <<= 8
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x |= self.bytes[self.index]
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self.index += 1
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return x
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def getFixBytes(self, lengthBytes):
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bytes = self.bytes[self.index : self.index+lengthBytes]
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self.index += lengthBytes
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return bytes
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def getVarBytes(self, lengthLength):
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lengthBytes = self.get(lengthLength)
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return self.getFixBytes(lengthBytes)
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def getFixList(self, length, lengthList):
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l = [0] * lengthList
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for x in range(lengthList):
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l[x] = self.get(length)
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return l
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def getVarList(self, length, lengthLength):
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lengthList = self.get(lengthLength)
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if lengthList % length != 0:
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raise ASN1Error("Error decoding ASN.1")
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lengthList = int(lengthList/length)
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l = [0] * lengthList
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for x in range(lengthList):
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l[x] = self.get(length)
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return l
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def startLengthCheck(self, lengthLength):
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self.lengthCheck = self.get(lengthLength)
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self.indexCheck = self.index
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def setLengthCheck(self, length):
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self.lengthCheck = length
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self.indexCheck = self.index
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def stopLengthCheck(self):
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if (self.index - self.indexCheck) != self.lengthCheck:
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raise ASN1Error("Error decoding ASN.1")
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def atLengthCheck(self):
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if (self.index - self.indexCheck) < self.lengthCheck:
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return False
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elif (self.index - self.indexCheck) == self.lengthCheck:
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return True
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else:
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raise ASN1Error("Error decoding ASN.1")
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def __init__(self, bytes):
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p = self.Parser(bytes)
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p.get(1)
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self.length = self._getASN1Length(p)
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self.value = p.getFixBytes(self.length)
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def getChild(self, which):
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p = self.Parser(self.value)
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for x in range(which+1):
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markIndex = p.index
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p.get(1)
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length = self._getASN1Length(p)
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p.getFixBytes(length)
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return ASN1Parser(p.bytes[markIndex:p.index])
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def _getASN1Length(self, p):
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firstLength = p.get(1)
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if firstLength<=127:
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return firstLength
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else:
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lengthLength = firstLength & 0x7F
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return p.get(lengthLength)
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###
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### PDF parsing routines from pdfminer, with changes for EBX_HANDLER
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## Utilities
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##
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def choplist(n, seq):
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'''Groups every n elements of the list.'''
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r = []
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for x in seq:
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r.append(x)
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if len(r) == n:
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yield tuple(r)
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r = []
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return
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def nunpack(s, default=0):
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'''Unpacks up to 4 bytes big endian.'''
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l = len(s)
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if not l:
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return default
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elif l == 1:
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return ord(s)
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elif l == 2:
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return struct.unpack('>H', s)[0]
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elif l == 3:
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return struct.unpack('>L', '\x00'+s)[0]
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elif l == 4:
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return struct.unpack('>L', s)[0]
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else:
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return TypeError('invalid length: %d' % l)
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STRICT = 1
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## PS Exceptions
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##
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class PSException(Exception): pass
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class PSEOF(PSException): pass
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class PSSyntaxError(PSException): pass
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class PSTypeError(PSException): pass
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class PSValueError(PSException): pass
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## Basic PostScript Types
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##
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# PSLiteral
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class PSObject(object): pass
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class PSLiteral(PSObject):
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'''
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PS literals (e.g. "/Name").
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Caution: Never create these objects directly.
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Use PSLiteralTable.intern() instead.
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'''
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def __init__(self, name):
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self.name = name
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return
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def __repr__(self):
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name = []
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for char in self.name:
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if not char.isalnum():
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char = '#%02x' % ord(char)
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name.append(char)
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return '/%s' % ''.join(name)
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# PSKeyword
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class PSKeyword(PSObject):
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'''
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PS keywords (e.g. "showpage").
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Caution: Never create these objects directly.
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Use PSKeywordTable.intern() instead.
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'''
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def __init__(self, name):
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self.name = name
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return
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def __repr__(self):
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return self.name
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# PSSymbolTable
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class PSSymbolTable(object):
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'''
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Symbol table that stores PSLiteral or PSKeyword.
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'''
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def __init__(self, classe):
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self.dic = {}
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self.classe = classe
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return
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def intern(self, name):
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if name in self.dic:
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lit = self.dic[name]
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else:
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lit = self.classe(name)
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self.dic[name] = lit
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return lit
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PSLiteralTable = PSSymbolTable(PSLiteral)
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PSKeywordTable = PSSymbolTable(PSKeyword)
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LIT = PSLiteralTable.intern
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KWD = PSKeywordTable.intern
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KEYWORD_BRACE_BEGIN = KWD('{')
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KEYWORD_BRACE_END = KWD('}')
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KEYWORD_ARRAY_BEGIN = KWD('[')
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KEYWORD_ARRAY_END = KWD(']')
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KEYWORD_DICT_BEGIN = KWD('<<')
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KEYWORD_DICT_END = KWD('>>')
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def literal_name(x):
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if not isinstance(x, PSLiteral):
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if STRICT:
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raise PSTypeError('Literal required: %r' % x)
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else:
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return str(x)
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return x.name
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def keyword_name(x):
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if not isinstance(x, PSKeyword):
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if STRICT:
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raise PSTypeError('Keyword required: %r' % x)
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else:
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return str(x)
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return x.name
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## PSBaseParser
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##
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EOL = re.compile(r'[\r\n]')
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SPC = re.compile(r'\s')
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NONSPC = re.compile(r'\S')
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HEX = re.compile(r'[0-9a-fA-F]')
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END_LITERAL = re.compile(r'[#/%\[\]()<>{}\s]')
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END_HEX_STRING = re.compile(r'[^\s0-9a-fA-F]')
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HEX_PAIR = re.compile(r'[0-9a-fA-F]{2}|.')
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END_NUMBER = re.compile(r'[^0-9]')
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END_KEYWORD = re.compile(r'[#/%\[\]()<>{}\s]')
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END_STRING = re.compile(r'[()\134]')
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OCT_STRING = re.compile(r'[0-7]')
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ESC_STRING = { 'b':8, 't':9, 'n':10, 'f':12, 'r':13, '(':40, ')':41, '\\':92 }
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class PSBaseParser(object):
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'''
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Most basic PostScript parser that performs only basic tokenization.
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'''
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BUFSIZ = 4096
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def __init__(self, fp):
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self.fp = fp
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self.seek(0)
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return
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def __repr__(self):
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return '<PSBaseParser: %r, bufpos=%d>' % (self.fp, self.bufpos)
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def flush(self):
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return
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def close(self):
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self.flush()
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return
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def tell(self):
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return self.bufpos+self.charpos
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def poll(self, pos=None, n=80):
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pos0 = self.fp.tell()
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if not pos:
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pos = self.bufpos+self.charpos
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self.fp.seek(pos)
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print >>sys.stderr, 'poll(%d): %r' % (pos, self.fp.read(n))
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self.fp.seek(pos0)
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return
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def seek(self, pos):
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'''
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Seeks the parser to the given position.
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'''
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self.fp.seek(pos)
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# reset the status for nextline()
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self.bufpos = pos
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self.buf = ''
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self.charpos = 0
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# reset the status for nexttoken()
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self.parse1 = self.parse_main
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self.tokens = []
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return
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def fillbuf(self):
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if self.charpos < len(self.buf): return
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# fetch next chunk.
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self.bufpos = self.fp.tell()
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self.buf = self.fp.read(self.BUFSIZ)
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if not self.buf:
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raise PSEOF('Unexpected EOF')
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self.charpos = 0
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return
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def parse_main(self, s, i):
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m = NONSPC.search(s, i)
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if not m:
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return (self.parse_main, len(s))
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j = m.start(0)
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c = s[j]
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self.tokenstart = self.bufpos+j
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if c == '%':
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self.token = '%'
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return (self.parse_comment, j+1)
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if c == '/':
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self.token = ''
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return (self.parse_literal, j+1)
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if c in '-+' or c.isdigit():
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self.token = c
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return (self.parse_number, j+1)
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if c == '.':
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self.token = c
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return (self.parse_float, j+1)
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if c.isalpha():
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self.token = c
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return (self.parse_keyword, j+1)
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if c == '(':
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self.token = ''
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self.paren = 1
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return (self.parse_string, j+1)
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if c == '<':
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self.token = ''
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return (self.parse_wopen, j+1)
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if c == '>':
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self.token = ''
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return (self.parse_wclose, j+1)
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self.add_token(KWD(c))
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return (self.parse_main, j+1)
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def add_token(self, obj):
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self.tokens.append((self.tokenstart, obj))
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return
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def parse_comment(self, s, i):
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m = EOL.search(s, i)
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if not m:
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self.token += s[i:]
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return (self.parse_comment, len(s))
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j = m.start(0)
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self.token += s[i:j]
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# We ignore comments.
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#self.tokens.append(self.token)
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return (self.parse_main, j)
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def parse_literal(self, s, i):
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m = END_LITERAL.search(s, i)
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if not m:
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self.token += s[i:]
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return (self.parse_literal, len(s))
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j = m.start(0)
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self.token += s[i:j]
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c = s[j]
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if c == '#':
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self.hex = ''
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return (self.parse_literal_hex, j+1)
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self.add_token(LIT(self.token))
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return (self.parse_main, j)
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def parse_literal_hex(self, s, i):
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c = s[i]
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if HEX.match(c) and len(self.hex) < 2:
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self.hex += c
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return (self.parse_literal_hex, i+1)
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if self.hex:
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self.token += chr(int(self.hex, 16))
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return (self.parse_literal, i)
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def parse_number(self, s, i):
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m = END_NUMBER.search(s, i)
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if not m:
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self.token += s[i:]
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return (self.parse_number, len(s))
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j = m.start(0)
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self.token += s[i:j]
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c = s[j]
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if c == '.':
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self.token += c
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return (self.parse_float, j+1)
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try:
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self.add_token(int(self.token))
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except ValueError:
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pass
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return (self.parse_main, j)
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def parse_float(self, s, i):
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m = END_NUMBER.search(s, i)
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if not m:
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self.token += s[i:]
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return (self.parse_float, len(s))
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j = m.start(0)
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self.token += s[i:j]
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self.add_token(float(self.token))
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return (self.parse_main, j)
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def parse_keyword(self, s, i):
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m = END_KEYWORD.search(s, i)
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if not m:
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self.token += s[i:]
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return (self.parse_keyword, len(s))
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j = m.start(0)
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self.token += s[i:j]
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if self.token == 'true':
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token = True
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elif self.token == 'false':
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token = False
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else:
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token = KWD(self.token)
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self.add_token(token)
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return (self.parse_main, j)
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def parse_string(self, s, i):
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m = END_STRING.search(s, i)
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if not m:
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self.token += s[i:]
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return (self.parse_string, len(s))
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j = m.start(0)
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self.token += s[i:j]
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c = s[j]
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if c == '\\':
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self.oct = ''
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return (self.parse_string_1, j+1)
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if c == '(':
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self.paren += 1
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self.token += c
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return (self.parse_string, j+1)
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if c == ')':
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self.paren -= 1
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if self.paren:
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self.token += c
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return (self.parse_string, j+1)
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self.add_token(self.token)
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return (self.parse_main, j+1)
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def parse_string_1(self, s, i):
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c = s[i]
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if OCT_STRING.match(c) and len(self.oct) < 3:
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self.oct += c
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return (self.parse_string_1, i+1)
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if self.oct:
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self.token += chr(int(self.oct, 8))
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return (self.parse_string, i)
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if c in ESC_STRING:
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self.token += chr(ESC_STRING[c])
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return (self.parse_string, i+1)
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def parse_wopen(self, s, i):
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c = s[i]
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if c.isspace() or HEX.match(c):
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return (self.parse_hexstring, i)
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if c == '<':
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self.add_token(KEYWORD_DICT_BEGIN)
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i += 1
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return (self.parse_main, i)
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def parse_wclose(self, s, i):
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c = s[i]
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if c == '>':
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self.add_token(KEYWORD_DICT_END)
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i += 1
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return (self.parse_main, i)
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def parse_hexstring(self, s, i):
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m = END_HEX_STRING.search(s, i)
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if not m:
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self.token += s[i:]
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return (self.parse_hexstring, len(s))
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j = m.start(0)
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self.token += s[i:j]
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token = HEX_PAIR.sub(lambda m: chr(int(m.group(0), 16)),
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SPC.sub('', self.token))
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self.add_token(token)
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return (self.parse_main, j)
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def nexttoken(self):
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while not self.tokens:
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self.fillbuf()
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(self.parse1, self.charpos) = self.parse1(self.buf, self.charpos)
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token = self.tokens.pop(0)
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return token
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def nextline(self):
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'''
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|
Fetches a next line that ends either with \\r or \\n.
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|
'''
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linebuf = ''
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linepos = self.bufpos + self.charpos
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eol = False
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while 1:
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self.fillbuf()
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if eol:
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|
c = self.buf[self.charpos]
|
|
# handle '\r\n'
|
|
if c == '\n':
|
|
linebuf += c
|
|
self.charpos += 1
|
|
break
|
|
m = EOL.search(self.buf, self.charpos)
|
|
if m:
|
|
linebuf += self.buf[self.charpos:m.end(0)]
|
|
self.charpos = m.end(0)
|
|
if linebuf[-1] == '\r':
|
|
eol = True
|
|
else:
|
|
break
|
|
else:
|
|
linebuf += self.buf[self.charpos:]
|
|
self.charpos = len(self.buf)
|
|
return (linepos, linebuf)
|
|
|
|
def revreadlines(self):
|
|
'''
|
|
Fetches a next line backword. This is used to locate
|
|
the trailers at the end of a file.
|
|
'''
|
|
self.fp.seek(0, 2)
|
|
pos = self.fp.tell()
|
|
buf = ''
|
|
while 0 < pos:
|
|
pos = max(0, pos-self.BUFSIZ)
|
|
self.fp.seek(pos)
|
|
s = self.fp.read(self.BUFSIZ)
|
|
if not s: break
|
|
while 1:
|
|
n = max(s.rfind('\r'), s.rfind('\n'))
|
|
if n == -1:
|
|
buf = s + buf
|
|
break
|
|
yield buf+s[n:]
|
|
s = s[:n]
|
|
buf = ''
|
|
return
|
|
|
|
|
|
## PSStackParser
|
|
##
|
|
class PSStackParser(PSBaseParser):
|
|
|
|
def __init__(self, fp):
|
|
PSBaseParser.__init__(self, fp)
|
|
self.reset()
|
|
return
|
|
|
|
def reset(self):
|
|
self.context = []
|
|
self.curtype = None
|
|
self.curstack = []
|
|
self.results = []
|
|
return
|
|
|
|
def seek(self, pos):
|
|
PSBaseParser.seek(self, pos)
|
|
self.reset()
|
|
return
|
|
|
|
def push(self, *objs):
|
|
self.curstack.extend(objs)
|
|
return
|
|
def pop(self, n):
|
|
objs = self.curstack[-n:]
|
|
self.curstack[-n:] = []
|
|
return objs
|
|
def popall(self):
|
|
objs = self.curstack
|
|
self.curstack = []
|
|
return objs
|
|
def add_results(self, *objs):
|
|
self.results.extend(objs)
|
|
return
|
|
|
|
def start_type(self, pos, type):
|
|
self.context.append((pos, self.curtype, self.curstack))
|
|
(self.curtype, self.curstack) = (type, [])
|
|
return
|
|
def end_type(self, type):
|
|
if self.curtype != type:
|
|
raise PSTypeError('Type mismatch: %r != %r' % (self.curtype, type))
|
|
objs = [ obj for (_,obj) in self.curstack ]
|
|
(pos, self.curtype, self.curstack) = self.context.pop()
|
|
return (pos, objs)
|
|
|
|
def do_keyword(self, pos, token):
|
|
return
|
|
|
|
def nextobject(self):
|
|
'''
|
|
Yields a list of objects: keywords, literals, strings,
|
|
numbers, arrays and dictionaries. Arrays and dictionaries
|
|
are represented as Python sequence and dictionaries.
|
|
'''
|
|
while not self.results:
|
|
(pos, token) = self.nexttoken()
|
|
#print (pos,token), (self.curtype, self.curstack)
|
|
if (isinstance(token, int) or
|
|
isinstance(token, float) or
|
|
isinstance(token, bool) or
|
|
isinstance(token, str) or
|
|
isinstance(token, PSLiteral)):
|
|
# normal token
|
|
self.push((pos, token))
|
|
elif token == KEYWORD_ARRAY_BEGIN:
|
|
# begin array
|
|
self.start_type(pos, 'a')
|
|
elif token == KEYWORD_ARRAY_END:
|
|
# end array
|
|
try:
|
|
self.push(self.end_type('a'))
|
|
except PSTypeError:
|
|
if STRICT: raise
|
|
elif token == KEYWORD_DICT_BEGIN:
|
|
# begin dictionary
|
|
self.start_type(pos, 'd')
|
|
elif token == KEYWORD_DICT_END:
|
|
# end dictionary
|
|
try:
|
|
(pos, objs) = self.end_type('d')
|
|
if len(objs) % 2 != 0:
|
|
raise PSSyntaxError(
|
|
'Invalid dictionary construct: %r' % objs)
|
|
d = dict((literal_name(k), v) \
|
|
for (k,v) in choplist(2, objs))
|
|
self.push((pos, d))
|
|
except PSTypeError:
|
|
if STRICT: raise
|
|
else:
|
|
self.do_keyword(pos, token)
|
|
if self.context:
|
|
continue
|
|
else:
|
|
self.flush()
|
|
obj = self.results.pop(0)
|
|
return obj
|
|
|
|
|
|
LITERAL_CRYPT = PSLiteralTable.intern('Crypt')
|
|
LITERALS_FLATE_DECODE = (PSLiteralTable.intern('FlateDecode'), PSLiteralTable.intern('Fl'))
|
|
LITERALS_LZW_DECODE = (PSLiteralTable.intern('LZWDecode'), PSLiteralTable.intern('LZW'))
|
|
LITERALS_ASCII85_DECODE = (PSLiteralTable.intern('ASCII85Decode'), PSLiteralTable.intern('A85'))
|
|
|
|
|
|
## PDF Objects
|
|
##
|
|
class PDFObject(PSObject): pass
|
|
|
|
class PDFException(PSException): pass
|
|
class PDFTypeError(PDFException): pass
|
|
class PDFValueError(PDFException): pass
|
|
class PDFNotImplementedError(PSException): pass
|
|
|
|
|
|
## PDFObjRef
|
|
##
|
|
class PDFObjRef(PDFObject):
|
|
|
|
def __init__(self, doc, objid, _):
|
|
if objid == 0:
|
|
if STRICT:
|
|
raise PDFValueError('PDF object id cannot be 0.')
|
|
self.doc = doc
|
|
self.objid = objid
|
|
#self.genno = genno # Never used.
|
|
return
|
|
|
|
def __repr__(self):
|
|
return '<PDFObjRef:%d>' % (self.objid)
|
|
|
|
def resolve(self):
|
|
return self.doc.getobj(self.objid)
|
|
|
|
|
|
# resolve
|
|
def resolve1(x):
|
|
'''
|
|
Resolve an object. If this is an array or dictionary,
|
|
it may still contains some indirect objects inside.
|
|
'''
|
|
while isinstance(x, PDFObjRef):
|
|
x = x.resolve()
|
|
return x
|
|
|
|
def resolve_all(x):
|
|
'''
|
|
Recursively resolve X and all the internals.
|
|
Make sure there is no indirect reference within the nested object.
|
|
This procedure might be slow.
|
|
'''
|
|
while isinstance(x, PDFObjRef):
|
|
x = x.resolve()
|
|
if isinstance(x, list):
|
|
x = [ resolve_all(v) for v in x ]
|
|
elif isinstance(x, dict):
|
|
for (k,v) in x.iteritems():
|
|
x[k] = resolve_all(v)
|
|
return x
|
|
|
|
def decipher_all(decipher, objid, genno, x):
|
|
'''
|
|
Recursively decipher X.
|
|
'''
|
|
if isinstance(x, str):
|
|
return decipher(objid, genno, x)
|
|
decf = lambda v: decipher_all(decipher, objid, genno, v)
|
|
if isinstance(x, list):
|
|
x = [decf(v) for v in x]
|
|
elif isinstance(x, dict):
|
|
x = dict((k, decf(v)) for (k, v) in x.iteritems())
|
|
return x
|
|
|
|
# Type cheking
|
|
def int_value(x):
|
|
x = resolve1(x)
|
|
if not isinstance(x, int):
|
|
if STRICT:
|
|
raise PDFTypeError('Integer required: %r' % x)
|
|
return 0
|
|
return x
|
|
|
|
def float_value(x):
|
|
x = resolve1(x)
|
|
if not isinstance(x, float):
|
|
if STRICT:
|
|
raise PDFTypeError('Float required: %r' % x)
|
|
return 0.0
|
|
return x
|
|
|
|
def num_value(x):
|
|
x = resolve1(x)
|
|
if not (isinstance(x, int) or isinstance(x, float)):
|
|
if STRICT:
|
|
raise PDFTypeError('Int or Float required: %r' % x)
|
|
return 0
|
|
return x
|
|
|
|
def str_value(x):
|
|
x = resolve1(x)
|
|
if not isinstance(x, str):
|
|
if STRICT:
|
|
raise PDFTypeError('String required: %r' % x)
|
|
return ''
|
|
return x
|
|
|
|
def list_value(x):
|
|
x = resolve1(x)
|
|
if not (isinstance(x, list) or isinstance(x, tuple)):
|
|
if STRICT:
|
|
raise PDFTypeError('List required: %r' % x)
|
|
return []
|
|
return x
|
|
|
|
def dict_value(x):
|
|
x = resolve1(x)
|
|
if not isinstance(x, dict):
|
|
if STRICT:
|
|
raise PDFTypeError('Dict required: %r' % x)
|
|
return {}
|
|
return x
|
|
|
|
def stream_value(x):
|
|
x = resolve1(x)
|
|
if not isinstance(x, PDFStream):
|
|
if STRICT:
|
|
raise PDFTypeError('PDFStream required: %r' % x)
|
|
return PDFStream({}, '')
|
|
return x
|
|
|
|
# ascii85decode(data)
|
|
def ascii85decode(data):
|
|
n = b = 0
|
|
out = ''
|
|
for c in data:
|
|
if '!' <= c and c <= 'u':
|
|
n += 1
|
|
b = b*85+(ord(c)-33)
|
|
if n == 5:
|
|
out += struct.pack('>L',b)
|
|
n = b = 0
|
|
elif c == 'z':
|
|
assert n == 0
|
|
out += '\0\0\0\0'
|
|
elif c == '~':
|
|
if n:
|
|
for _ in range(5-n):
|
|
b = b*85+84
|
|
out += struct.pack('>L',b)[:n-1]
|
|
break
|
|
return out
|
|
|
|
|
|
## PDFStream type
|
|
##
|
|
class PDFStream(PDFObject):
|
|
|
|
def __init__(self, dic, rawdata, decipher=None):
|
|
length = int_value(dic.get('Length', 0))
|
|
eol = rawdata[length:]
|
|
if eol in ('\r', '\n', '\r\n'):
|
|
rawdata = rawdata[:length]
|
|
if length != len(rawdata):
|
|
print >>sys.stderr, "[warning] data length mismatch"
|
|
self.dic = dic
|
|
self.rawdata = rawdata
|
|
self.decipher = decipher
|
|
self.data = None
|
|
self.objid = None
|
|
self.genno = None
|
|
return
|
|
|
|
def set_objid(self, objid, genno):
|
|
self.objid = objid
|
|
self.genno = genno
|
|
return
|
|
|
|
def __repr__(self):
|
|
return '<PDFStream(%r): raw=%d, %r>' % \
|
|
(self.objid, len(self.rawdata), self.dic)
|
|
|
|
def decode(self):
|
|
assert self.data == None and self.rawdata != None
|
|
data = self.rawdata
|
|
if self.decipher:
|
|
# Handle encryption
|
|
data = self.decipher(self.objid, self.genno, data)
|
|
if 'Filter' not in self.dic:
|
|
self.data = data
|
|
self.rawdata = None
|
|
return
|
|
filters = self.dic['Filter']
|
|
if not isinstance(filters, list):
|
|
filters = [ filters ]
|
|
for f in filters:
|
|
if f in LITERALS_FLATE_DECODE:
|
|
# will get errors if the document is encrypted.
|
|
data = zlib.decompress(data)
|
|
elif f in LITERALS_LZW_DECODE:
|
|
try:
|
|
from cStringIO import StringIO
|
|
except ImportError:
|
|
from StringIO import StringIO
|
|
data = ''.join(LZWDecoder(StringIO(data)).run())
|
|
elif f in LITERALS_ASCII85_DECODE:
|
|
data = ascii85decode(data)
|
|
elif f == LITERAL_CRYPT:
|
|
raise PDFNotImplementedError('/Crypt filter is unsupported')
|
|
else:
|
|
raise PDFNotImplementedError('Unsupported filter: %r' % f)
|
|
# apply predictors
|
|
if 'DP' in self.dic:
|
|
params = self.dic['DP']
|
|
else:
|
|
params = self.dic.get('DecodeParms', {})
|
|
if 'Predictor' in params:
|
|
pred = int_value(params['Predictor'])
|
|
if pred:
|
|
if pred != 12:
|
|
raise PDFNotImplementedError(
|
|
'Unsupported predictor: %r' % pred)
|
|
if 'Columns' not in params:
|
|
raise PDFValueError(
|
|
'Columns undefined for predictor=12')
|
|
columns = int_value(params['Columns'])
|
|
buf = ''
|
|
ent0 = '\x00' * columns
|
|
for i in xrange(0, len(data), columns+1):
|
|
pred = data[i]
|
|
ent1 = data[i+1:i+1+columns]
|
|
if pred == '\x02':
|
|
ent1 = ''.join(chr((ord(a)+ord(b)) & 255) \
|
|
for (a,b) in zip(ent0,ent1))
|
|
buf += ent1
|
|
ent0 = ent1
|
|
data = buf
|
|
self.data = data
|
|
self.rawdata = None
|
|
return
|
|
|
|
def get_data(self):
|
|
if self.data == None:
|
|
self.decode()
|
|
return self.data
|
|
|
|
def get_rawdata(self):
|
|
return self.rawdata
|
|
|
|
def get_decdata(self):
|
|
data = self.rawdata
|
|
if self.decipher and data:
|
|
# Handle encryption
|
|
data = self.decipher(self.objid, self.genno, data)
|
|
return data
|
|
|
|
|
|
## PDF Exceptions
|
|
##
|
|
class PDFSyntaxError(PDFException): pass
|
|
class PDFNoValidXRef(PDFSyntaxError): pass
|
|
class PDFEncryptionError(PDFException): pass
|
|
class PDFPasswordIncorrect(PDFEncryptionError): pass
|
|
|
|
# some predefined literals and keywords.
|
|
LITERAL_OBJSTM = PSLiteralTable.intern('ObjStm')
|
|
LITERAL_XREF = PSLiteralTable.intern('XRef')
|
|
LITERAL_PAGE = PSLiteralTable.intern('Page')
|
|
LITERAL_PAGES = PSLiteralTable.intern('Pages')
|
|
LITERAL_CATALOG = PSLiteralTable.intern('Catalog')
|
|
|
|
|
|
## XRefs
|
|
##
|
|
|
|
## PDFXRef
|
|
##
|
|
class PDFXRef(object):
|
|
|
|
def __init__(self):
|
|
self.offsets = None
|
|
return
|
|
|
|
def __repr__(self):
|
|
return '<PDFXRef: objs=%d>' % len(self.offsets)
|
|
|
|
def objids(self):
|
|
return self.offsets.iterkeys()
|
|
|
|
def load(self, parser):
|
|
self.offsets = {}
|
|
while 1:
|
|
try:
|
|
(pos, line) = parser.nextline()
|
|
except PSEOF:
|
|
raise PDFNoValidXRef('Unexpected EOF - file corrupted?')
|
|
if not line:
|
|
raise PDFNoValidXRef('Premature eof: %r' % parser)
|
|
if line.startswith('trailer'):
|
|
parser.seek(pos)
|
|
break
|
|
f = line.strip().split(' ')
|
|
if len(f) != 2:
|
|
raise PDFNoValidXRef('Trailer not found: %r: line=%r' % (parser, line))
|
|
try:
|
|
(start, nobjs) = map(long, f)
|
|
except ValueError:
|
|
raise PDFNoValidXRef('Invalid line: %r: line=%r' % (parser, line))
|
|
for objid in xrange(start, start+nobjs):
|
|
try:
|
|
(_, line) = parser.nextline()
|
|
except PSEOF:
|
|
raise PDFNoValidXRef('Unexpected EOF - file corrupted?')
|
|
f = line.strip().split(' ')
|
|
if len(f) != 3:
|
|
raise PDFNoValidXRef('Invalid XRef format: %r, line=%r' % (parser, line))
|
|
(pos, genno, use) = f
|
|
if use != 'n': continue
|
|
self.offsets[objid] = (int(genno), long(pos))
|
|
self.load_trailer(parser)
|
|
return
|
|
|
|
KEYWORD_TRAILER = PSKeywordTable.intern('trailer')
|
|
def load_trailer(self, parser):
|
|
try:
|
|
(_,kwd) = parser.nexttoken()
|
|
assert kwd is self.KEYWORD_TRAILER
|
|
(_,dic) = parser.nextobject()
|
|
except PSEOF:
|
|
x = parser.pop(1)
|
|
if not x:
|
|
raise PDFNoValidXRef('Unexpected EOF - file corrupted')
|
|
(_,dic) = x[0]
|
|
self.trailer = dict_value(dic)
|
|
return
|
|
|
|
def getpos(self, objid):
|
|
try:
|
|
(genno, pos) = self.offsets[objid]
|
|
except KeyError:
|
|
raise
|
|
return (None, pos)
|
|
|
|
|
|
## PDFXRefStream
|
|
##
|
|
class PDFXRefStream(object):
|
|
|
|
def __init__(self):
|
|
self.index = None
|
|
self.data = None
|
|
self.entlen = None
|
|
self.fl1 = self.fl2 = self.fl3 = None
|
|
return
|
|
|
|
def __repr__(self):
|
|
return '<PDFXRef: objid=%d-%d>' % (self.objid_first, self.objid_last)
|
|
|
|
def objids(self):
|
|
for first, size in self.index:
|
|
for objid in xrange(first, first + size):
|
|
yield objid
|
|
|
|
def load(self, parser, debug=0):
|
|
(_,objid) = parser.nexttoken() # ignored
|
|
(_,genno) = parser.nexttoken() # ignored
|
|
(_,kwd) = parser.nexttoken()
|
|
(_,stream) = parser.nextobject()
|
|
if not isinstance(stream, PDFStream) or \
|
|
stream.dic['Type'] is not LITERAL_XREF:
|
|
raise PDFNoValidXRef('Invalid PDF stream spec.')
|
|
size = stream.dic['Size']
|
|
index = stream.dic.get('Index', (0,size))
|
|
self.index = zip(islice(index, 0, None, 2),
|
|
islice(index, 1, None, 2))
|
|
(self.fl1, self.fl2, self.fl3) = stream.dic['W']
|
|
self.data = stream.get_data()
|
|
self.entlen = self.fl1+self.fl2+self.fl3
|
|
self.trailer = stream.dic
|
|
return
|
|
|
|
def getpos(self, objid):
|
|
offset = 0
|
|
for first, size in self.index:
|
|
if first <= objid and objid < (first + size):
|
|
break
|
|
offset += size
|
|
else:
|
|
raise KeyError(objid)
|
|
i = self.entlen * ((objid - first) + offset)
|
|
ent = self.data[i:i+self.entlen]
|
|
f1 = nunpack(ent[:self.fl1], 1)
|
|
if f1 == 1:
|
|
pos = nunpack(ent[self.fl1:self.fl1+self.fl2])
|
|
genno = nunpack(ent[self.fl1+self.fl2:])
|
|
return (None, pos)
|
|
elif f1 == 2:
|
|
objid = nunpack(ent[self.fl1:self.fl1+self.fl2])
|
|
index = nunpack(ent[self.fl1+self.fl2:])
|
|
return (objid, index)
|
|
# this is a free object
|
|
raise KeyError(objid)
|
|
|
|
|
|
## PDFDocument
|
|
##
|
|
## A PDFDocument object represents a PDF document.
|
|
## Since a PDF file is usually pretty big, normally it is not loaded
|
|
## at once. Rather it is parsed dynamically as processing goes.
|
|
## A PDF parser is associated with the document.
|
|
##
|
|
class PDFDocument(object):
|
|
|
|
def __init__(self):
|
|
self.xrefs = []
|
|
self.objs = {}
|
|
self.parsed_objs = {}
|
|
self.root = None
|
|
self.catalog = None
|
|
self.parser = None
|
|
self.encryption = None
|
|
self.decipher = None
|
|
self.ready = False
|
|
return
|
|
|
|
# set_parser(parser)
|
|
# Associates the document with an (already initialized) parser object.
|
|
def set_parser(self, parser):
|
|
if self.parser: return
|
|
self.parser = parser
|
|
# The document is set to be temporarily ready during collecting
|
|
# all the basic information about the document, e.g.
|
|
# the header, the encryption information, and the access rights
|
|
# for the document.
|
|
self.ready = True
|
|
# Retrieve the information of each header that was appended
|
|
# (maybe multiple times) at the end of the document.
|
|
self.xrefs = parser.read_xref()
|
|
for xref in self.xrefs:
|
|
trailer = xref.trailer
|
|
if not trailer: continue
|
|
# If there's an encryption info, remember it.
|
|
if 'Encrypt' in trailer:
|
|
#assert not self.encryption
|
|
self.encryption = (list_value(trailer['ID']),
|
|
dict_value(trailer['Encrypt']))
|
|
if 'Root' in trailer:
|
|
self.set_root(dict_value(trailer['Root']))
|
|
break
|
|
else:
|
|
raise PDFSyntaxError('No /Root object! - Is this really a PDF?')
|
|
# The document is set to be non-ready again, until all the
|
|
# proper initialization (asking the password key and
|
|
# verifying the access permission, so on) is finished.
|
|
self.ready = False
|
|
return
|
|
|
|
# set_root(root)
|
|
# Set the Root dictionary of the document.
|
|
# Each PDF file must have exactly one /Root dictionary.
|
|
def set_root(self, root):
|
|
self.root = root
|
|
self.catalog = dict_value(self.root)
|
|
if self.catalog.get('Type') is not LITERAL_CATALOG:
|
|
if STRICT:
|
|
raise PDFSyntaxError('Catalog not found!')
|
|
return
|
|
|
|
# initialize(password='')
|
|
# 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=''):
|
|
if not self.encryption:
|
|
self.is_printable = self.is_modifiable = self.is_extractable = True
|
|
self.ready = True
|
|
return
|
|
(docid, param) = self.encryption
|
|
type = literal_name(param['Filter'])
|
|
if type == 'Standard':
|
|
return self.initialize_standard(password, docid, param)
|
|
if type == 'EBX_HANDLER':
|
|
return self.initialize_ebx(password, docid, param)
|
|
raise PDFEncryptionError('Unknown filter: param=%r' % param)
|
|
|
|
def initialize_ebx(self, password, docid, param):
|
|
self.is_printable = self.is_modifiable = self.is_extractable = True
|
|
with open(password, 'r') as f:
|
|
keyderlist = pickle.load(f)
|
|
keynotfound = 1
|
|
for keyder in keyderlist:
|
|
key = ASN1Parser([ord(x) for x in keyder])
|
|
key = [bytesToNumber(key.getChild(x).value) for x in xrange(1, 4)]
|
|
try:
|
|
rsa = RSA.construct(key)
|
|
except Exception:
|
|
continue
|
|
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')
|
|
try:
|
|
bookkey = rsa.decrypt(bookkey)
|
|
except Exception:
|
|
continue
|
|
if bookkey[0] != '\x02':
|
|
keynotfound = 1
|
|
continue
|
|
else:
|
|
keynotfound = 0
|
|
index = bookkey.index('\0') + 1
|
|
bookkey = bookkey[index:]
|
|
ebx_V = int_value(param.get('V', 4))
|
|
ebx_type = int_value(param.get('EBX_ENCRYPTIONTYPE', 6))
|
|
# added because of the booktype / decryption book session key error
|
|
if ebx_V == 3:
|
|
V = 3
|
|
elif ebx_V < 4 or ebx_type < 6:
|
|
V = ord(bookkey[0])
|
|
bookkey = bookkey[1:]
|
|
else:
|
|
V = 2
|
|
if length and len(bookkey) != length:
|
|
raise ADEPTError('error decrypting book session key')
|
|
self.decrypt_key = bookkey
|
|
self.genkey = self.genkey_v3 if V == 3 else self.genkey_v2
|
|
self.decipher = self.decrypt_rc4
|
|
self.ready = True
|
|
break
|
|
if keynotfound == 1:
|
|
raise ADEPTError('problem decrypting session key')
|
|
return
|
|
|
|
PASSWORD_PADDING = '(\xbfN^Nu\x8aAd\x00NV\xff\xfa\x01\x08..' \
|
|
'\x00\xb6\xd0h>\x80/\x0c\xa9\xfedSiz'
|
|
def initialize_standard(self, password, docid, param):
|
|
V = int_value(param.get('V', 0))
|
|
if not (V == 1 or V == 2):
|
|
raise PDFEncryptionError('Unknown algorithm: param=%r' % param)
|
|
length = int_value(param.get('Length', 40)) # Key length (bits)
|
|
O = str_value(param['O'])
|
|
R = int_value(param['R']) # Revision
|
|
if 5 <= R:
|
|
raise PDFEncryptionError('Unknown revision: %r' % R)
|
|
U = str_value(param['U'])
|
|
P = int_value(param['P'])
|
|
self.is_printable = bool(P & 4)
|
|
self.is_modifiable = bool(P & 8)
|
|
self.is_extractable = bool(P & 16)
|
|
# Algorithm 3.2
|
|
password = (password+self.PASSWORD_PADDING)[:32] # 1
|
|
hash = hashlib.md5(password) # 2
|
|
hash.update(O) # 3
|
|
hash.update(struct.pack('<l', P)) # 4
|
|
hash.update(docid[0]) # 5
|
|
if 4 <= R:
|
|
# 6
|
|
raise PDFNotImplementedError(
|
|
'Revision 4 encryption is currently unsupported')
|
|
if 3 <= R:
|
|
# 8
|
|
for _ in xrange(50):
|
|
hash = hashlib.md5(hash.digest()[:length/8])
|
|
key = hash.digest()[:length/8]
|
|
if R == 2:
|
|
# Algorithm 3.4
|
|
u1 = ARC4.new(key).decrypt(password)
|
|
elif R == 3:
|
|
# Algorithm 3.5
|
|
hash = hashlib.md5(self.PASSWORD_PADDING) # 2
|
|
hash.update(docid[0]) # 3
|
|
x = ARC4.new(key).decrypt(hash.digest()[:16]) # 4
|
|
for i in xrange(1,19+1):
|
|
k = ''.join( chr(ord(c) ^ i) for c in key )
|
|
x = ARC4.new(k).decrypt(x)
|
|
u1 = x+x # 32bytes total
|
|
if R == 2:
|
|
is_authenticated = (u1 == U)
|
|
else:
|
|
is_authenticated = (u1[:16] == U[:16])
|
|
if not is_authenticated:
|
|
raise PDFPasswordIncorrect
|
|
self.decrypt_key = key
|
|
self.genkey = self.genkey_v2
|
|
self.decipher = self.decipher_rc4 # XXX may be AES
|
|
self.ready = True
|
|
return
|
|
|
|
def genkey_v2(self, objid, genno):
|
|
objid = struct.pack('<L', objid)[:3]
|
|
genno = struct.pack('<L', genno)[:2]
|
|
key = self.decrypt_key + objid + genno
|
|
hash = hashlib.md5(key)
|
|
key = hash.digest()[:min(len(self.decrypt_key) + 5, 16)]
|
|
return key
|
|
|
|
def genkey_v3(self, objid, genno):
|
|
objid = struct.pack('<L', objid ^ 0x3569ac)
|
|
genno = struct.pack('<L', genno ^ 0xca96)
|
|
key = self.decrypt_key
|
|
key += objid[0] + genno[0] + objid[1] + genno[1] + objid[2] + 'sAlT'
|
|
hash = hashlib.md5(key)
|
|
key = hash.digest()[:min(len(self.decrypt_key) + 5, 16)]
|
|
return key
|
|
|
|
def decrypt_rc4(self, objid, genno, data):
|
|
key = self.genkey(objid, genno)
|
|
return ARC4.new(key).decrypt(data)
|
|
|
|
KEYWORD_OBJ = PSKeywordTable.intern('obj')
|
|
def getobj(self, objid):
|
|
if not self.ready:
|
|
raise PDFException('PDFDocument not initialized')
|
|
#assert self.xrefs
|
|
if objid in self.objs:
|
|
genno = 0
|
|
obj = self.objs[objid]
|
|
else:
|
|
for xref in self.xrefs:
|
|
try:
|
|
(stmid, index) = xref.getpos(objid)
|
|
break
|
|
except KeyError:
|
|
pass
|
|
else:
|
|
return
|
|
#if STRICT:
|
|
# raise PDFSyntaxError('Cannot locate objid=%r' % objid)
|
|
return None
|
|
if stmid:
|
|
return PDFObjStmRef(objid, stmid, index)
|
|
else:
|
|
self.parser.seek(index)
|
|
(_,objid1) = self.parser.nexttoken() # objid
|
|
(_,genno) = self.parser.nexttoken() # genno
|
|
#assert objid1 == objid, (objid, objid1)
|
|
(_,kwd) = self.parser.nexttoken()
|
|
if kwd is not self.KEYWORD_OBJ:
|
|
raise PDFSyntaxError(
|
|
'Invalid object spec: offset=%r' % index)
|
|
(_,obj) = self.parser.nextobject()
|
|
if isinstance(obj, PDFStream):
|
|
obj.set_objid(objid, genno)
|
|
self.objs[objid] = obj
|
|
if self.decipher:
|
|
obj = decipher_all(self.decipher, objid, genno, obj)
|
|
return obj
|
|
|
|
class PDFObjStmRef(object):
|
|
def __init__(self, objid, stmid, index):
|
|
self.objid = objid
|
|
self.stmid = stmid
|
|
self.index = index
|
|
|
|
|
|
## PDFParser
|
|
##
|
|
class PDFParser(PSStackParser):
|
|
|
|
def __init__(self, doc, fp):
|
|
PSStackParser.__init__(self, fp)
|
|
self.doc = doc
|
|
self.doc.set_parser(self)
|
|
return
|
|
|
|
def __repr__(self):
|
|
return '<PDFParser>'
|
|
|
|
KEYWORD_R = PSKeywordTable.intern('R')
|
|
KEYWORD_ENDOBJ = PSKeywordTable.intern('endobj')
|
|
KEYWORD_STREAM = PSKeywordTable.intern('stream')
|
|
KEYWORD_XREF = PSKeywordTable.intern('xref')
|
|
KEYWORD_STARTXREF = PSKeywordTable.intern('startxref')
|
|
def do_keyword(self, pos, token):
|
|
if token in (self.KEYWORD_XREF, self.KEYWORD_STARTXREF):
|
|
self.add_results(*self.pop(1))
|
|
return
|
|
if token is self.KEYWORD_ENDOBJ:
|
|
self.add_results(*self.pop(4))
|
|
return
|
|
|
|
if token is self.KEYWORD_R:
|
|
# reference to indirect object
|
|
try:
|
|
((_,objid), (_,genno)) = self.pop(2)
|
|
(objid, genno) = (int(objid), int(genno))
|
|
obj = PDFObjRef(self.doc, objid, genno)
|
|
self.push((pos, obj))
|
|
except PSSyntaxError:
|
|
pass
|
|
return
|
|
|
|
if token is self.KEYWORD_STREAM:
|
|
# stream object
|
|
((_,dic),) = self.pop(1)
|
|
dic = dict_value(dic)
|
|
try:
|
|
objlen = int_value(dic['Length'])
|
|
except KeyError:
|
|
if STRICT:
|
|
raise PDFSyntaxError('/Length is undefined: %r' % dic)
|
|
objlen = 0
|
|
self.seek(pos)
|
|
try:
|
|
(_, line) = self.nextline() # 'stream'
|
|
except PSEOF:
|
|
if STRICT:
|
|
raise PDFSyntaxError('Unexpected EOF')
|
|
return
|
|
pos += len(line)
|
|
self.fp.seek(pos)
|
|
data = self.fp.read(objlen)
|
|
self.seek(pos+objlen)
|
|
while 1:
|
|
try:
|
|
(linepos, line) = self.nextline()
|
|
except PSEOF:
|
|
if STRICT:
|
|
raise PDFSyntaxError('Unexpected EOF')
|
|
break
|
|
if 'endstream' in line:
|
|
i = line.index('endstream')
|
|
objlen += i
|
|
data += line[:i]
|
|
break
|
|
objlen += len(line)
|
|
data += line
|
|
self.seek(pos+objlen)
|
|
obj = PDFStream(dic, data, self.doc.decipher)
|
|
self.push((pos, obj))
|
|
return
|
|
|
|
# others
|
|
self.push((pos, token))
|
|
return
|
|
|
|
def find_xref(self):
|
|
# search the last xref table by scanning the file backwards.
|
|
prev = None
|
|
for line in self.revreadlines():
|
|
line = line.strip()
|
|
if line == 'startxref': break
|
|
if line:
|
|
prev = line
|
|
else:
|
|
raise PDFNoValidXRef('Unexpected EOF')
|
|
return long(prev)
|
|
|
|
# read xref table
|
|
def read_xref_from(self, start, xrefs):
|
|
self.seek(start)
|
|
self.reset()
|
|
try:
|
|
(pos, token) = self.nexttoken()
|
|
except PSEOF:
|
|
raise PDFNoValidXRef('Unexpected EOF')
|
|
if isinstance(token, int):
|
|
# XRefStream: PDF-1.5
|
|
self.seek(pos)
|
|
self.reset()
|
|
xref = PDFXRefStream()
|
|
xref.load(self)
|
|
else:
|
|
if token is not self.KEYWORD_XREF:
|
|
raise PDFNoValidXRef('xref not found: pos=%d, token=%r' %
|
|
(pos, token))
|
|
self.nextline()
|
|
xref = PDFXRef()
|
|
xref.load(self)
|
|
xrefs.append(xref)
|
|
trailer = xref.trailer
|
|
if 'XRefStm' in trailer:
|
|
pos = int_value(trailer['XRefStm'])
|
|
self.read_xref_from(pos, xrefs)
|
|
if 'Prev' in trailer:
|
|
# find previous xref
|
|
pos = int_value(trailer['Prev'])
|
|
self.read_xref_from(pos, xrefs)
|
|
return
|
|
|
|
# read xref tables and trailers
|
|
def read_xref(self):
|
|
xrefs = []
|
|
try:
|
|
pos = self.find_xref()
|
|
self.read_xref_from(pos, xrefs)
|
|
except PDFNoValidXRef:
|
|
# fallback
|
|
self.seek(0)
|
|
pat = re.compile(r'^(\d+)\s+(\d+)\s+obj\b')
|
|
offsets = {}
|
|
xref = PDFXRef()
|
|
while 1:
|
|
try:
|
|
(pos, line) = self.nextline()
|
|
except PSEOF:
|
|
break
|
|
if line.startswith('trailer'): break
|
|
m = pat.match(line)
|
|
if not m: continue
|
|
(objid, genno) = m.groups()
|
|
offsets[int(objid)] = (0, pos)
|
|
if not offsets: raise
|
|
xref.offsets = offsets
|
|
self.seek(pos)
|
|
xref.load_trailer(self)
|
|
xrefs.append(xref)
|
|
return xrefs
|
|
|
|
|
|
###
|
|
### My own code, for which there is none else to blame
|
|
|
|
class PDFSerializer(object):
|
|
def __init__(self, inf, keypath):
|
|
self.version = inf.read(8)
|
|
inf.seek(0)
|
|
self.doc = doc = PDFDocument()
|
|
parser = PDFParser(doc, inf)
|
|
doc.initialize(keypath)
|
|
self.objids = objids = set()
|
|
for xref in reversed(doc.xrefs):
|
|
trailer = xref.trailer
|
|
for objid in xref.objids():
|
|
objids.add(objid)
|
|
trailer = dict(trailer)
|
|
trailer.pop('Prev', None)
|
|
trailer.pop('XRefStm', None)
|
|
if 'Encrypt' in trailer:
|
|
objids.remove(trailer.pop('Encrypt').objid)
|
|
self.trailer = trailer
|
|
|
|
def dump(self, outf):
|
|
self.outf = outf
|
|
self.write(self.version)
|
|
self.write('\n%\xe2\xe3\xcf\xd3\n')
|
|
doc = self.doc
|
|
objids = self.objids
|
|
xrefs = {}
|
|
xrefstm = {}
|
|
maxobj = max(objids)
|
|
trailer = dict(self.trailer)
|
|
trailer['Size'] = maxobj + 1
|
|
for objid in objids:
|
|
obj = doc.getobj(objid)
|
|
if isinstance(obj, PDFObjStmRef):
|
|
xrefstm[objid] = obj
|
|
continue
|
|
xrefs[objid] = self.tell()
|
|
self.serialize_indirect(objid, obj)
|
|
startxref = self.tell()
|
|
self.write('xref\n')
|
|
self.write('0 %d\n' % (maxobj + 1,))
|
|
for objid in xrange(0, maxobj + 1):
|
|
if objid in xrefs:
|
|
self.write("%010d %05d n \n" % (xrefs[objid], 0))
|
|
else:
|
|
self.write("%010d %05d f \n" % (0, 65535))
|
|
self.write('trailer\n')
|
|
self.serialize_object(trailer)
|
|
self.write('\nstartxref\n%d\n%%%%EOF' % startxref)
|
|
if not xrefstm:
|
|
return
|
|
index = []
|
|
first = None
|
|
prev = None
|
|
data = []
|
|
for objid in sorted(xrefstm):
|
|
if first is None:
|
|
first = objid
|
|
elif objid != prev + 1:
|
|
index.extend((first, prev - first + 1))
|
|
first = objid
|
|
prev = objid
|
|
stmid = xrefstm[objid].stmid
|
|
data.append(struct.pack('>BHB', 2, stmid, 0))
|
|
index.extend((first, prev - first + 1))
|
|
data = zlib.compress(''.join(data))
|
|
dic = {'Type': LITERAL_XREF, 'Size': prev + 1, 'Index': index,
|
|
'W': [1, 2, 1], 'Length': len(data), 'Prev': startxref,
|
|
'Filter': LITERALS_FLATE_DECODE[0],}
|
|
obj = PDFStream(dic, data)
|
|
self.write('\n')
|
|
trailer['XRefStm'] = startxrefstm = self.tell()
|
|
self.serialize_indirect(maxobj + 1, obj)
|
|
trailer['Prev'] = startxref
|
|
startxref = self.tell()
|
|
self.write('xref\n')
|
|
self.write('%d 1\n' % (maxobj + 1,))
|
|
self.write("%010d %05d n \n" % (startxrefstm, 0))
|
|
self.write('trailer\n')
|
|
self.serialize_object(trailer)
|
|
self.write('\nstartxref\n%d\n%%%%EOF' % startxref)
|
|
|
|
def write(self, data):
|
|
self.outf.write(data)
|
|
self.last = data[-1:]
|
|
|
|
def tell(self):
|
|
return self.outf.tell()
|
|
|
|
def escape_string(self, string):
|
|
string = string.replace('\\', '\\\\')
|
|
string = string.replace('\n', r'\n')
|
|
string = string.replace('(', r'\(')
|
|
string = string.replace(')', r'\)')
|
|
# get rid of ciando id
|
|
regularexp = re.compile(r'http://www.ciando.com/index.cfm/intRefererID/\d{5}')
|
|
if regularexp.match(string): return ('http://www.ciando.com')
|
|
return string
|
|
|
|
def serialize_object(self, obj):
|
|
if isinstance(obj, dict):
|
|
self.write('<<')
|
|
for key, val in obj.items():
|
|
self.write('/%s' % key)
|
|
self.serialize_object(val)
|
|
self.write('>>')
|
|
elif isinstance(obj, list):
|
|
self.write('[')
|
|
for val in obj:
|
|
self.serialize_object(val)
|
|
self.write(']')
|
|
elif isinstance(obj, str):
|
|
self.write('(%s)' % self.escape_string(obj))
|
|
elif isinstance(obj, bool):
|
|
if self.last.isalnum():
|
|
self.write(' ')
|
|
self.write(str(obj).lower())
|
|
elif isinstance(obj, (int, long, float)):
|
|
if self.last.isalnum():
|
|
self.write(' ')
|
|
self.write(str(obj))
|
|
elif isinstance(obj, PDFObjRef):
|
|
if self.last.isalnum():
|
|
self.write(' ')
|
|
self.write('%d %d R' % (obj.objid, 0))
|
|
elif isinstance(obj, PDFStream):
|
|
data = obj.get_decdata()
|
|
self.serialize_object(obj.dic)
|
|
self.write('stream\n')
|
|
self.write(data)
|
|
self.write('\nendstream')
|
|
else:
|
|
data = str(obj)
|
|
if data[0].isalnum() and self.last.isalnum():
|
|
self.write(' ')
|
|
self.write(data)
|
|
|
|
def serialize_indirect(self, objid, obj):
|
|
self.write('%d 0 obj' % (objid,))
|
|
self.serialize_object(obj)
|
|
if self.last.isalnum():
|
|
self.write('\n')
|
|
self.write('endobj\n')
|
|
|
|
def cli_main(argv=sys.argv):
|
|
progname = os.path.basename(argv[0])
|
|
if RSA is None:
|
|
print "%s: This script requires PyCrypto, which must be installed " \
|
|
"separately. Read the top-of-script comment for details." % \
|
|
(progname,)
|
|
return 1
|
|
if len(argv) != 4:
|
|
print "usage: %s KEYFILE INBOOK OUTBOOK" % (progname,)
|
|
return 1
|
|
keypath, inpath, outpath = argv[1:]
|
|
with open(inpath, 'rb') as inf:
|
|
serializer = PDFSerializer(inf, keypath)
|
|
with open(outpath, 'wb') as outf:
|
|
serializer.dump(outf)
|
|
return 0
|
|
|
|
|
|
class DecryptionDialog(Tkinter.Frame):
|
|
def __init__(self, root):
|
|
Tkinter.Frame.__init__(self, root, border=5)
|
|
self.status = Tkinter.Label(self, text='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='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('adeptkey4.der'):
|
|
self.keypath.insert(0, 'adeptkey4.der')
|
|
button = Tkinter.Button(body, text="...", command=self.get_keypath)
|
|
button.grid(row=0, column=2)
|
|
Tkinter.Label(body, text='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="...", command=self.get_inpath)
|
|
button.grid(row=1, column=2)
|
|
Tkinter.Label(body, text='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="...", command=self.get_outpath)
|
|
button.grid(row=2, column=2)
|
|
buttons = Tkinter.Frame(self)
|
|
buttons.pack()
|
|
botton = Tkinter.Button(
|
|
buttons, text="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="Quit", width=10, command=self.quit)
|
|
button.pack(side=Tkconstants.RIGHT)
|
|
|
|
def get_keypath(self):
|
|
keypath = tkFileDialog.askopenfilename(
|
|
parent=None, title='Select ADEPT key file',
|
|
defaultextension='.der', filetypes=[('DER-encoded files', '.der'),
|
|
('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='Select ADEPT-encrypted PDF file to decrypt',
|
|
defaultextension='.epub', filetypes=[('PDF files', '.pdf'),
|
|
('All files', '.*')])
|
|
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='Select unencrypted PDF file to produce',
|
|
defaultextension='.epub', filetypes=[('PDF files', '.pdf'),
|
|
('All files', '.*')])
|
|
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'] = 'Specified key file does not exist'
|
|
return
|
|
if not inpath or not os.path.exists(inpath):
|
|
self.status['text'] = 'Specified input file does not exist'
|
|
return
|
|
if not outpath:
|
|
self.status['text'] = 'Output file not specified'
|
|
return
|
|
if inpath == outpath:
|
|
self.status['text'] = 'Must have different input and output files'
|
|
return
|
|
argv = [sys.argv[0], keypath, inpath, outpath]
|
|
self.status['text'] = 'Decrypting...'
|
|
try:
|
|
cli_main(argv)
|
|
except Exception, e:
|
|
self.status['text'] = 'Error: ' + str(e)
|
|
return
|
|
self.status['text'] = 'File successfully decrypted'
|
|
|
|
def gui_main():
|
|
root = Tkinter.Tk()
|
|
if RSA is None:
|
|
root.withdraw()
|
|
tkMessageBox.showerror(
|
|
"INEPT PDF Decrypter",
|
|
"This script requires PyCrypto, which must be installed "
|
|
"separately. Read the top-of-script comment for details.")
|
|
return 1
|
|
root.title('INEPT PDF Decrypter')
|
|
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())
|