mirror of
https://github.com/platomav/BIOSUtilities.git
synced 2025-05-12 22:26:13 -04:00
e56aa66895
Fixed BIOS Guard (PFAT) PFS Entry Signature parsing bug Minor improvement in BIOS Guard (PFAT) PFS Entry detection
1245 lines
No EOL
55 KiB
Python
1245 lines
No EOL
55 KiB
Python
#!/usr/bin/env python3
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#coding=utf-8
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"""
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Dell PFS Extract
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Dell PFS Update Extractor
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Copyright (C) 2018-2021 Plato Mavropoulos
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"""
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title = 'Dell PFS Update Extractor v5.1'
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import sys
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# Detect Python version
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sys_py = sys.version_info
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# Check Python version
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if sys_py < (3,7) :
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sys.stdout.write('%s\n\nError: Python >= 3.7 required, not %d.%d!\n' % (title, sys_py[0], sys_py[1]))
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if '--auto-exit' not in sys.argv and '-e' not in sys.argv :
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(raw_input if sys_py[0] <= 2 else input)('\nPress enter to exit') # pylint: disable=E0602
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sys.exit(1)
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# Detect OS platform
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sys_os = sys.platform
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# Check OS platform
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if sys_os == 'win32' :
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sys.stdout.reconfigure(encoding='utf-8') # Fix Windows Unicode console redirection
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elif sys_os.startswith('linux') or sys_os == 'darwin' or sys_os.find('bsd') != -1 :
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pass # Supported/Tested
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else :
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print('%s\n\nError: Unsupported platform "%s"!\n' % (title, sys_os))
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if '--auto-exit' not in sys.argv and '-e' not in sys.argv : input('Press enter to exit')
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sys.exit(1)
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# Skip __pycache__ generation
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sys.dont_write_bytecode = True
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# Python imports
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import os
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import re
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import zlib
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import lzma
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import shutil
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import ctypes
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import inspect
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import pathlib
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import argparse
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import traceback
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# Optional imports
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try :
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from big_script_tool import BigScript
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is_bgst = True
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except :
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is_bgst = False
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# Set ctypes Structure types
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char = ctypes.c_char
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uint8_t = ctypes.c_ubyte
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uint16_t = ctypes.c_ushort
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uint32_t = ctypes.c_uint
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uint64_t = ctypes.c_uint64
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# Dell PFS Header Structure
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class PFS_DELL_HDR(ctypes.LittleEndianStructure) :
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_pack_ = 1
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_fields_ = [
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('Tag', char*8), # 0x00
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('HeaderVersion', uint32_t), # 0x08
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('PayloadSize', uint32_t), # 0x0C
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# 0x10
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]
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def pfs_print(self, padd) :
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print('\n%sPFS Header:\n' % (' ' * (padd - 4)))
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print('%sHeader Tag : %s' % (' ' * padd, self.Tag.decode('utf-8')))
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print('%sHeader Version : %d' % (' ' * padd, self.HeaderVersion))
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print('%sPayload Size : 0x%X' % (' ' * padd, self.PayloadSize))
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# Dell PFS Footer Structure
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class PFS_DELL_FTR(ctypes.LittleEndianStructure) :
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_pack_ = 1
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_fields_ = [
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('PayloadSize', uint32_t), # 0x00
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('Checksum', uint32_t), # 0x04 ~CRC32 w/ Vector 0
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('Tag', char*8), # 0x08
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# 0x10
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]
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def pfs_print(self, padd) :
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print('\n%sPFS Footer:\n' % (' ' * (padd - 4)))
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print('%sPayload Size : 0x%X' % (' ' * padd, self.PayloadSize))
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print('%sPayload Checksum : 0x%0.8X' % (' ' * padd, self.Checksum))
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print('%sFooter Tag : %s' % (' ' * padd, self.Tag.decode('utf-8')))
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# Dell PFS Entry Revision 1 Structure
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class PFS_ENTRY_R1(ctypes.LittleEndianStructure) :
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_pack_ = 1
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_fields_ = [
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('GUID', uint32_t*4), # 0x00 Little Endian
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('HeaderVersion', uint32_t), # 0x10 1
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('VersionType', uint8_t*4), # 0x14
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('Version', uint16_t*4), # 0x18
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('Reserved', uint64_t), # 0x20
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('DataSize', uint32_t), # 0x28
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('DataSigSize', uint32_t), # 0x2C
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('DataMetSize', uint32_t), # 0x30
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('DataMetSigSize', uint32_t), # 0x34
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('Unknown', uint32_t*4), # 0x38
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# 0x48
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]
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def pfs_print(self, padd) :
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GUID = '%0.*X' % (0x10 * 2, int.from_bytes(self.GUID, 'little'))
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Unknown = '%0.*X' % (0x10 * 2, int.from_bytes(self.Unknown, 'little'))
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Version = get_entry_ver(self.Version, self.VersionType, padd - 4)
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print('\n%sPFS Entry:\n' % (' ' * (padd - 4)))
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print('%sEntry GUID : %s' % (' ' * padd, GUID))
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print('%sEntry Version : %d' % (' ' * padd, self.HeaderVersion))
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print('%sPayload Version : %s' % (' ' * padd, Version))
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print('%sReserved : 0x%X' % (' ' * padd, self.Reserved))
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print('%sPayload Data Size : 0x%X' % (' ' * padd, self.DataSize))
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print('%sPayload Signature Size : 0x%X' % (' ' * padd, self.DataSigSize))
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print('%sMetadata Data Size : 0x%X' % (' ' * padd, self.DataMetSize))
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print('%sMetadata Signature Size : 0x%X' % (' ' * padd, self.DataMetSigSize))
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print('%sUnknown : %s' % (' ' * padd, Unknown))
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# Dell PFS Entry Revision 2 Structure
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class PFS_ENTRY_R2(ctypes.LittleEndianStructure) :
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_pack_ = 1
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_fields_ = [
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('GUID', uint32_t*4), # 0x00 Little Endian
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('HeaderVersion', uint32_t), # 0x10 2
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('VersionType', uint8_t*4), # 0x14
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('Version', uint16_t*4), # 0x18
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('Reserved', uint64_t), # 0x20
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('DataSize', uint32_t), # 0x28
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('DataSigSize', uint32_t), # 0x2C
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('DataMetSize', uint32_t), # 0x30
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('DataMetSigSize', uint32_t), # 0x34
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('Unknown', uint32_t*8), # 0x38
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# 0x58
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]
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def pfs_print(self, padd) :
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GUID = '%0.*X' % (0x10 * 2, int.from_bytes(self.GUID, 'little'))
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Unknown = '%0.*X' % (0x20 * 2, int.from_bytes(self.Unknown, 'little'))
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Version = get_entry_ver(self.Version, self.VersionType, padd - 4)
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print('\n%sPFS Entry:\n' % (' ' * (padd - 4)))
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print('%sEntry GUID : %s' % (' ' * padd, GUID))
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print('%sEntry Version : %d' % (' ' * padd, self.HeaderVersion))
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print('%sPayload Version : %s' % (' ' * padd, Version))
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print('%sReserved : 0x%X' % (' ' * padd, self.Reserved))
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print('%sPayload Data Size : 0x%X' % (' ' * padd, self.DataSize))
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print('%sPayload Signature Size : 0x%X' % (' ' * padd, self.DataSigSize))
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print('%sMetadata Data Size : 0x%X' % (' ' * padd, self.DataMetSize))
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print('%sMetadata Signature Size : 0x%X' % (' ' * padd, self.DataMetSigSize))
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print('%sUnknown : %s' % (' ' * padd, Unknown))
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# Dell PFS Information Header Structure
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class PFS_INFO_HDR(ctypes.LittleEndianStructure) :
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_pack_ = 1
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_fields_ = [
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('HeaderVersion', uint32_t), # 0x00
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('GUID', uint32_t*4), # 0x04 Little Endian
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# 0x14
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]
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def pfs_print(self, padd) :
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GUID = '%0.*X' % (0x10 * 2, int.from_bytes(self.GUID, 'little'))
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print('\n%sPFS Information Header:\n' % (' ' * (padd - 4)))
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print('%sInfo Version : %d' % (' ' * padd, self.HeaderVersion))
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print('%sEntry GUID : %s' % (' ' * padd, GUID))
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# Dell PFS FileName Header Structure
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class PFS_NAME_HDR(ctypes.LittleEndianStructure) :
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_pack_ = 1
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_fields_ = [
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('Version', uint16_t*4), # 0x00
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('VersionType', uint8_t*4), # 0x08
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('CharacterCount', uint16_t), # 0x0C UTF-16 2-byte Characters
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# 0x0E
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]
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def pfs_print(self, padd) :
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Version = get_entry_ver(self.Version, self.VersionType, padd - 4)
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print('\n%sPFS FileName Entry:\n' % (' ' * (padd - 4)))
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print('%sPayload Version : %s' % (' ' * padd, Version))
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print('%sCharacter Count : %d' % (' ' * padd, self.CharacterCount))
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# Dell PFS Metadata Header Structure
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class PFS_META_HDR(ctypes.LittleEndianStructure) :
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_pack_ = 1
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_fields_ = [
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('ModelIDs', char*501), # 0x000
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('FileName', char*100), # 0x1F5
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('FileVersion', char*33), # 0x259
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('Date', char*33), # 0x27A
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('Brand', char*80), # 0x29B
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('ModelFile', char*80), # 0x2EB
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('ModelName', char*100), # 0x33B
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('ModelVersion', char*33), # 0x39F
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# 0x3C0
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]
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def pfs_print(self, padd) :
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print('\n%sPFS Metadata Information:\n' % (' ' * (padd - 4)))
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print('%sModel IDs : %s' % (' ' * padd, self.ModelIDs.decode('utf-8').strip(',END')))
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print('%sFile Name : %s' % (' ' * padd, self.FileName.decode('utf-8')))
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print('%sFile Version : %s' % (' ' * padd, self.FileVersion.decode('utf-8')))
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print('%sDate : %s' % (' ' * padd, self.Date.decode('utf-8')))
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print('%sBrand : %s' % (' ' * padd, self.Brand.decode('utf-8')))
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print('%sModel File : %s' % (' ' * padd, self.ModelFile.decode('utf-8')))
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print('%sModel Name : %s' % (' ' * padd, self.ModelName.decode('utf-8')))
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print('%sModel Version : %s' % (' ' * padd, self.ModelVersion.decode('utf-8')))
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def pfs_write(self) :
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return '%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s' % (self.ModelIDs.decode('utf-8').strip(',END'), self.FileName.decode('utf-8'),
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self.FileVersion.decode('utf-8'), self.Date.decode('utf-8'), self.Brand.decode('utf-8'), self.ModelFile.decode('utf-8'),
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self.ModelName.decode('utf-8'), self.ModelVersion.decode('utf-8'))
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# Dell PFS BIOS Guard Header Structure
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class PFS_PFAT_HDR(ctypes.LittleEndianStructure) :
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_pack_ = 1
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_fields_ = [
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('PFATVerMajor', uint16_t), # 0x00
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('PFATVerMinor', uint16_t), # 0x02
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('PlatformID', uint8_t*16), # 0x04
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('Attributes', uint32_t), # 0x14
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('ScriptVerMajor', uint16_t), # 0x16
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('ScriptVerMinor', uint16_t), # 0x18
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('ScriptSize', uint32_t), # 0x1C
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('DataSize', uint32_t), # 0x20
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('BIOSSVN', uint32_t), # 0x24
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('ECSVN', uint32_t), # 0x28
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('VendorInfo', uint32_t), # 0x2C
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# 0x30
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]
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def __init__(self, count, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.count = count
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def get_flags(self) :
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attr = PFS_PFAT_HDR_ATTRIBUTES_GET()
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attr.asbytes = self.Attributes
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return attr.b.SFAM, attr.b.ProtectEC, attr.b.GFXMitDis, attr.b.FTU, attr.b.Reserved
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def pfs_print(self, padd) :
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no_yes = ['No','Yes']
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f1,f2,f3,f4,f5 = self.get_flags()
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PlatformID = bytes(self.PlatformID).strip(b'\x00')
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try : # STRING
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PlatformID = PlatformID.decode('utf-8')
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except : # GUID
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PlatformID = '%0.*X' % (0x10 * 2, int.from_bytes(self.PlatformID, 'big'))
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PlatformID = '{%s-%s-%s-%s-%s}' % (PlatformID[:8], PlatformID[8:12], PlatformID[12:16], PlatformID[16:20], PlatformID[20:])
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print('\n%sPFAT Block %d Header:\n' % (' ' * (padd - 4), self.count))
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print('%sPFAT Version : %d.%d' % (' ' * padd, self.PFATVerMajor, self.PFATVerMinor))
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print('%sPlatform ID : %s' % (' ' * padd, PlatformID))
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print('%sSigned Flash Address Map : %s' % (' ' * padd, no_yes[f1]))
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print('%sProtected EC OpCodes : %s' % (' ' * padd, no_yes[f2]))
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print('%sGraphics Security Disable : %s' % (' ' * padd, no_yes[f3]))
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print('%sFault Tolerant Update : %s' % (' ' * padd, no_yes[f4]))
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print('%sAttributes Reserved : 0x%X' % (' ' * padd, f5))
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print('%sScript Version : %d.%d' % (' ' * padd, self.ScriptVerMajor, self.ScriptVerMinor))
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print('%sScript Size : 0x%X' % (' ' * padd, self.ScriptSize))
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print('%sData Size : 0x%X' % (' ' * padd, self.DataSize))
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print('%sBIOS SVN : 0x%X' % (' ' * padd, self.BIOSSVN))
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print('%sEC SVN : 0x%X' % (' ' * padd, self.ECSVN))
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print('%sVendor Info : 0x%X' % (' ' * padd, self.VendorInfo))
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# Dell PFS BIOS Guard Attributes Flags Structure
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class PFS_PFAT_HDR_ATTRIBUTES(ctypes.LittleEndianStructure):
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_fields_ = [
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('SFAM', uint32_t, 1), # Signed Flash Address Map
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('ProtectEC', uint32_t, 1), # Protected EC OpCodes
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('GFXMitDis', uint32_t, 1), # GFX Security Disable
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('FTU', uint32_t, 1), # Fault Tolerant Update
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('Reserved', uint32_t, 28)
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]
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# Dell PFS BIOS Guard Attributes Get Structure
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class PFS_PFAT_HDR_ATTRIBUTES_GET(ctypes.Union):
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_fields_ = [
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('b', PFS_PFAT_HDR_ATTRIBUTES),
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('asbytes', uint32_t)
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]
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# Dell PFS BIOS Guard Signature Structure
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class PFS_PFAT_SIG(ctypes.LittleEndianStructure) :
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_pack_ = 1
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_fields_ = [
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('Unknown0', uint32_t), # 0x00
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('Unknown1', uint32_t), # 0x04
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('PublicKey', uint32_t*64), # 0x08
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('Exponent', uint32_t), # 0x108
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('Signature', uint32_t*64), # 0x10C
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# 0x20C
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]
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def __init__(self, count, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.count = count
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def pfs_print(self, padd) :
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PublicKey = '%0.*X' % (0x100 * 2, int.from_bytes(self.PublicKey, 'little'))
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Signature = '%0.*X' % (0x100 * 2, int.from_bytes(self.Signature, 'little'))
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print('\n%sPFAT Block %d Signature:\n' % (' ' * (padd - 4), self.count))
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print('%sUnknown 0 : 0x%X' % (' ' * padd, self.Unknown0))
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print('%sUnknown 1 : 0x%X' % (' ' * padd, self.Unknown1))
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print('%sPublic Key : %s [...]' % (' ' * padd, PublicKey[:32]))
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print('%sExponent : 0x%X' % (' ' * padd, self.Exponent))
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print('%sSignature : %s [...]' % (' ' * padd, Signature[:32]))
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# Dell PFS BIOS Guard Metadata Structure
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class PFS_PFAT_MET(ctypes.LittleEndianStructure) :
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_pack_ = 1
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_fields_ = [
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('OffsetTop', uint32_t), # 0x00
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('Unknown0', uint32_t), # 0x04
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('OffsetBase', uint32_t), # 0x08
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('BlockSize', uint32_t), # 0x0C
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('Unknown1', uint32_t), # 0x10
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('Unknown2', uint32_t), # 0x14
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('Unknown3', uint8_t), # 0x18
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# 0x19
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]
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def __init__(self, count, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.count = count
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def pfs_print(self, padd) :
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print('\n%sPFAT Block %d Metadata:\n' % (' ' * (padd - 4), self.count))
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print('%sOffset Top : 0x%X' % (' ' * padd, self.OffsetTop))
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print('%sUnknown 0 : 0x%X' % (' ' * padd, self.Unknown0))
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print('%sOffset Base : 0x%X' % (' ' * padd, self.OffsetBase))
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print('%sBlock Size : 0x%X' % (' ' * padd, self.BlockSize))
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print('%sUnknown 1 : 0x%X' % (' ' * padd, self.Unknown1))
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print('%sUnknown 2 : 0x%X' % (' ' * padd, self.Unknown2))
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print('%sUnknown 3 : 0x%X' % (' ' * padd, self.Unknown3))
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# Dell PFS Update Analysis
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def main(exit_code, pfs_input_images) :
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# Process each input Dell PFS update image
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for input_file in pfs_input_images :
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input_name,input_ext = os.path.splitext(os.path.basename(input_file))
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input_dir = os.path.dirname(os.path.abspath(input_file))
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print('\n*** %s%s' % (input_name, input_ext))
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# Check if input file exists
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if not os.path.isfile(input_file) :
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print('\n Error: This input file does not exist!')
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continue # Next input file
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with open(input_file, 'rb') as in_file : input_data = in_file.read()
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# Search input image for ThinOS PKG 7zXZ section header
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lzma_pkg_hdr_match = lzma_pkg_header.search(input_data)
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# Decompress ThinOS PKG 7zXZ section first, if present
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if lzma_pkg_hdr_match :
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lzma_len_off = lzma_pkg_hdr_match.start() + 0x10
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lzma_len_int = int.from_bytes(input_data[lzma_len_off:lzma_len_off + 0x4], 'little')
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lzma_bin_off = lzma_pkg_hdr_match.end() - 0x5
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lzma_bin_dat = input_data[lzma_bin_off:lzma_bin_off + lzma_len_int]
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# Check if the compressed 7zXZ stream is complete, based on header
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if len(lzma_bin_dat) != lzma_len_int :
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print('\n Error: This Dell ThinOS PKG update image is corrupted!')
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continue # Next input file
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input_data = lzma.decompress(lzma_bin_dat)
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# Search input image for PFS ZLIB Sections
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pfs_zlib_offsets = get_section_offsets(input_data)
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if not pfs_zlib_offsets :
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print('\n Error: This is not a Dell PFS update image!')
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continue # Next input file
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# Set user extraction path
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extract_path_user = get_absolute_path(args.output_dir)
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|
|
# Set main extraction path (optional user specified path taken into account)
|
|
extract_path_main = os.path.join(extract_path_user, '%s%s' % (input_name, input_ext) + '_extracted')
|
|
|
|
# Parse each PFS ZLIB Section
|
|
for offset in pfs_zlib_offsets :
|
|
# Call the PFS ZLIB Section Parser function
|
|
pfs_section_parse(input_data, offset, extract_path_main, ' ' + input_name, 1, 1, False, 4)
|
|
|
|
exit_code -= 1 # Adjust exit code to reflect extraction progress
|
|
|
|
if not bool(args.auto_exit) : input('\nDone!')
|
|
|
|
return exit_code
|
|
|
|
# Get PFS ZLIB Section Offsets
|
|
def get_section_offsets(buffer) :
|
|
pfs_zlib_init = list(pfs_zlib_header.finditer(buffer))
|
|
|
|
if not pfs_zlib_init : return [] # No PFS ZLIB detected
|
|
|
|
pfs_zlib_list = [] # Initialize PFS ZLIB offset list
|
|
|
|
# Remove duplicate/nested PFS ZLIB offsets
|
|
for zlib_c in pfs_zlib_init :
|
|
is_duplicate = False # Initialize duplicate/nested PFS ZLIB offset
|
|
|
|
for zlib_o in pfs_zlib_init :
|
|
zlib_o_size = int.from_bytes(buffer[zlib_o.start() - 0x5:zlib_o.start() - 0x1], 'little')
|
|
|
|
# If current PFS ZLIB offset is within another PFS ZLIB range (start-end), set as duplicate
|
|
if zlib_o.start() < zlib_c.start() < zlib_o.start() + zlib_o_size : is_duplicate = True
|
|
|
|
if not is_duplicate : pfs_zlib_list.append(zlib_c.start())
|
|
|
|
return pfs_zlib_list
|
|
|
|
# Dell PFS ZLIB Section Parser
|
|
def pfs_section_parse(zlib_data, zlib_start, output_path, pfs_name, pfs_index, pfs_count, is_rec, padd) :
|
|
is_zlib_error = False # Initialize PFS ZLIB-related error state
|
|
|
|
section_type = zlib_data[zlib_start - 0x1] # Byte before PFS ZLIB Section pattern is Section Type (e.g. AA, BB)
|
|
section_name = section_dict[section_type] if section_type in section_dict else 'Unknown (%0.2X)' % section_type
|
|
|
|
# Set PFS ZLIB Section extraction sub-directory path
|
|
section_path = os.path.join(output_path, section_name)
|
|
|
|
# Delete existing extraction sub-directory (not in recursions)
|
|
if os.path.isdir(section_path) and not is_rec : shutil.rmtree(section_path)
|
|
|
|
# Create extraction sub-directory
|
|
if not os.path.isdir(section_path) : os.makedirs(section_path)
|
|
|
|
# Store the compressed zlib stream start offset
|
|
compressed_start = zlib_start + 0xB
|
|
|
|
# Store the PFS ZLIB section header start offset
|
|
header_start = zlib_start - 0x5
|
|
|
|
# Store the PFS ZLIB section header contents (16 bytes)
|
|
header_data = zlib_data[header_start:compressed_start]
|
|
|
|
# Check if the PFS ZLIB section header Checksum XOR 8 is valid
|
|
if chk_xor_8(header_data[:0xF], 0) != header_data[0xF] :
|
|
print('\n%sError: Invalid Dell PFS ZLIB section Header Checksum!' % (' ' * padd))
|
|
is_zlib_error = True
|
|
|
|
# Store the compressed zlib stream size from the header contents
|
|
compressed_size_hdr = int.from_bytes(header_data[:0x4], 'little')
|
|
|
|
# Store the compressed zlib stream end offset
|
|
compressed_end = compressed_start + compressed_size_hdr
|
|
|
|
# Store the compressed zlib stream contents
|
|
compressed_data = zlib_data[compressed_start:compressed_end]
|
|
|
|
# Check if the compressed zlib stream is complete, based on header
|
|
if len(compressed_data) != compressed_size_hdr :
|
|
print('\n%sError: Incomplete Dell PFS ZLIB section data (Header)!' % (' ' * padd))
|
|
is_zlib_error = True
|
|
|
|
# Store the PFS ZLIB section footer contents (16 bytes)
|
|
footer_data = zlib_data[compressed_end:compressed_end + 0x10]
|
|
|
|
# Search input section for PFS ZLIB section footer
|
|
pfs_zlib_footer_match = pfs_zlib_footer.search(footer_data)
|
|
|
|
# Check if PFS ZLIB section footer was found in the section
|
|
if not pfs_zlib_footer_match :
|
|
print('\n%sError: This Dell PFS ZLIB section is corrupted!' % (' ' * padd))
|
|
is_zlib_error = True
|
|
|
|
# Check if the PFS ZLIB section footer Checksum XOR 8 is valid
|
|
if chk_xor_8(footer_data[:0xF], 0) != footer_data[0xF] :
|
|
print('\n%sError: Invalid Dell PFS ZLIB section Footer Checksum!' % (' ' * padd))
|
|
is_zlib_error = True
|
|
|
|
# Store the compressed zlib stream size from the footer contents
|
|
compressed_size_ftr = int.from_bytes(footer_data[:0x4], 'little')
|
|
|
|
# Check if the compressed zlib stream is complete, based on footer
|
|
if compressed_size_ftr != compressed_size_hdr :
|
|
print('\n%sError: Incomplete Dell PFS ZLIB section data (Footer)!' % (' ' * padd))
|
|
is_zlib_error = True
|
|
|
|
# Decompress PFS ZLIB section payload
|
|
try :
|
|
assert not is_zlib_error # ZLIB errors are critical
|
|
section_data = zlib.decompress(compressed_data) # ZLIB decompression
|
|
except :
|
|
section_data = zlib_data # Fallback to raw ZLIB data upon critical error
|
|
|
|
# Call the PFS Extract function on the decompressed PFS ZLIB Section
|
|
pfs_extract(section_data, pfs_index, pfs_name, pfs_count, section_path, padd)
|
|
|
|
# Show extraction complete message for each main PFS ZLIB Section
|
|
print('\n%sExtracted Dell PFS %d >%s > %s section!' % (' ' * padd, pfs_index, pfs_name, section_name))
|
|
|
|
# Parse & Extract Dell PFS Volume
|
|
def pfs_extract(buffer, pfs_index, pfs_name, pfs_count, output_path, pfs_padd) :
|
|
if is_verbose : print('\n%sPFS Volume:' % (' ' * pfs_padd))
|
|
|
|
# Get PFS Header Structure values
|
|
pfs_hdr = get_struct(buffer, 0, PFS_DELL_HDR, None, pfs_padd + 4)
|
|
|
|
# Validate that a PFS Header was parsed
|
|
if pfs_hdr.Tag != b'PFS.HDR.' :
|
|
msg_print(pfs_padd + 4, 'Error: PFS Header could not be found!')
|
|
return # Critical error, abort
|
|
|
|
# Show PFS Header Structure info
|
|
if is_verbose : pfs_hdr.pfs_print(pfs_padd + 8)
|
|
|
|
# Validate that a known PFS Header Version was encountered
|
|
chk_hdr_ver(pfs_hdr.HeaderVersion, 'PFS', pfs_padd + 8)
|
|
|
|
# Get PFS Payload Data
|
|
pfs_payload = buffer[dpfs_hdr_size:dpfs_hdr_size + pfs_hdr.PayloadSize]
|
|
|
|
# Parse all PFS Payload Entries/Components
|
|
entry_index = 1 # Index number of each PFS Entry
|
|
entry_start = 0 # Increasing PFS Entry starting offset
|
|
entries_all = [] # Storage for each PFS Entry details
|
|
filename_info = [] # Buffer for FileName Information Entry Data
|
|
signature_info = [] # Buffer for Signature Information Entry Data
|
|
pfs_entry_struct, pfs_entry_size = get_pfs_entry(pfs_payload, entry_start) # Get PFS Entry Info
|
|
while len(pfs_payload[entry_start:entry_start + pfs_entry_size]) == pfs_entry_size :
|
|
# Analyze PFS Entry Structure and get relevant info
|
|
pfs_entry,entry_version,entry_guid,entry_data,entry_data_sig,entry_met,entry_met_sig,next_entry = \
|
|
parse_pfs_entry(pfs_payload, entry_start, pfs_entry_size, pfs_entry_struct, None, 'PFS Entry', pfs_padd)
|
|
|
|
entry_type = 'OTHER' # Adjusted later if PFS Entry is Zlib, PFAT, PFS Info, Model Info
|
|
|
|
# Get PFS Information from the PFS Entry with GUID E0717CE3A9BB25824B9F0DC8FD041960 or B033CB16EC9B45A14055F80E4D583FD3
|
|
if entry_guid in ['E0717CE3A9BB25824B9F0DC8FD041960','B033CB16EC9B45A14055F80E4D583FD3'] :
|
|
filename_info = entry_data
|
|
entry_type = 'NAME_INFO'
|
|
|
|
# Get Model Information from the PFS Entry with GUID 6F1D619A22A6CB924FD4DA68233AE3FB
|
|
elif entry_guid == '6F1D619A22A6CB924FD4DA68233AE3FB' :
|
|
entry_type = 'MODEL_INFO'
|
|
|
|
# Get Signature Information from the PFS Entry with GUID D086AFEE3ADBAEA94D5CED583C880BB7
|
|
elif entry_guid == 'D086AFEE3ADBAEA94D5CED583C880BB7' :
|
|
signature_info = entry_data
|
|
entry_type = 'SIG_INFO'
|
|
|
|
# Get Nested PFS from the PFS Entry with GUID 900FAE60437F3AB14055F456AC9FDA84
|
|
elif entry_guid == '900FAE60437F3AB14055F456AC9FDA84' :
|
|
entry_type = 'NESTED_PFS' # Nested PFS are usually zlib-compressed so it might change to 'ZLIB' later
|
|
|
|
# Store all relevant PFS Entry details
|
|
entries_all.append([entry_index, entry_guid, entry_version, entry_type, entry_data, entry_data_sig, entry_met, entry_met_sig])
|
|
|
|
entry_index += 1 # Increase PFS Entry Index number for user-friendly output and name duplicates
|
|
entry_start = next_entry # Next PFS Entry starts after PFS Entry Metadata Signature
|
|
|
|
# Parse all PFS Information Entries/Descriptors
|
|
info_start = 0 # Increasing PFS Information Entry starting offset
|
|
info_all = [] # Storage for each PFS Information Entry details
|
|
while len(filename_info[info_start:info_start + info_hdr_size]) == info_hdr_size :
|
|
# Get PFS Information Header Structure info
|
|
entry_info_hdr = get_struct(filename_info, info_start, PFS_INFO_HDR, None, pfs_padd + 8)
|
|
|
|
# Show PFS Information Header Structure info
|
|
if is_verbose : entry_info_hdr.pfs_print(pfs_padd + 8)
|
|
|
|
# Validate that a known PFS Information Header Version was encountered
|
|
if entry_info_hdr.HeaderVersion != 1 :
|
|
msg_print(pfs_padd + 8, 'Error: Unknown PFS Information Header Version %d!' % entry_info_hdr.HeaderVersion)
|
|
break # Skip PFS Information Entries/Descriptors in case of unknown PFS Information Header Version
|
|
|
|
# Get PFS Information Header GUID in Big Endian format to match each Info to the equivalent stored PFS Entry details
|
|
entry_guid = '%0.*X' % (0x10 * 2, int.from_bytes(entry_info_hdr.GUID, 'little'))
|
|
|
|
# Get PFS FileName Structure values
|
|
entry_info_mod = get_struct(filename_info, info_start + info_hdr_size, PFS_NAME_HDR, None, pfs_padd + 8)
|
|
|
|
# Show PFS FileName Structure info
|
|
if is_verbose : entry_info_mod.pfs_print(pfs_padd + 12)
|
|
|
|
# The PFS FileName Structure is not complete by itself. The size of the last field (Entry Name) is determined from
|
|
# CharacterCount multiplied by 2 due to usage of UTF-16 2-byte Characters. Any Entry Name leading and/or trailing
|
|
# space/null characters are stripped and common Windows reserved/illegal filename characters are replaced
|
|
name_start = info_start + info_hdr_size + name_hdr_size # PFS Entry's FileName start offset
|
|
name_size = entry_info_mod.CharacterCount * 2 # PFS Entry's FileName buffer total size
|
|
name_data = filename_info[name_start:name_start + name_size] # PFS Entry's FileName buffer
|
|
entry_name = re.sub(win_char_bad, '_', name_data.decode('utf-16').strip()) # PFS Entry's FileName value
|
|
|
|
# Show PFS FileName Name info (padding matches the one from PFS FileName Structure info)
|
|
if is_verbose : print('%sPayload Name%s: %s' % (' ' * (pfs_padd + 12), ' ' * 4, entry_name))
|
|
|
|
# Get PFS FileName Version string via "Version" and "VersionType" fields
|
|
# PFS FileName Version string must be preferred over PFS Entry's Version
|
|
entry_version = get_entry_ver(entry_info_mod.Version, entry_info_mod.VersionType, pfs_padd + 12)
|
|
|
|
# Store all relevant PFS FileName details
|
|
info_all.append([entry_guid, entry_name, entry_version])
|
|
|
|
# The next PFS Information Header starts after the calculated FileName size
|
|
# Two space/null characters seem to always exist after each FileName value
|
|
info_start += (info_hdr_size + name_hdr_size + name_size + 0x2)
|
|
|
|
# Parse Nested PFS Metadata when its PFS Information Entry is missing
|
|
for index in range(len(entries_all)) :
|
|
if entries_all[index][3] == 'NESTED_PFS' and not filename_info :
|
|
entry_guid = entries_all[index][1] # Nested PFS Entry GUID in Big Endian format
|
|
entry_metadata = entries_all[index][6] # Use Metadata as PFS Information Entry
|
|
|
|
# When PFS Information Entry exists, Nested PFS Metadata contains only Model IDs
|
|
# When it's missing, the Metadata structure is large and contains equivalent info
|
|
if len(entry_metadata) >= meta_hdr_size :
|
|
# Get Nested PFS Metadata Structure values
|
|
entry_info = get_struct(entry_metadata, 0, PFS_META_HDR, None, pfs_padd + 4)
|
|
|
|
# Show Nested PFS Metadata Structure info
|
|
if is_verbose : entry_info.pfs_print(pfs_padd + 8)
|
|
|
|
# As Nested PFS Entry Name, we'll use the actual PFS File Name
|
|
# Replace common Windows reserved/illegal filename characters
|
|
entry_name = re.sub(win_char_bad, '_', entry_info.FileName.decode('utf-8').strip('.exe'))
|
|
|
|
# As Nested PFS Entry Version, we'll use the actual PFS File Version
|
|
entry_version = entry_info.FileVersion.decode('utf-8')
|
|
|
|
# Store all relevant Nested PFS Metadata/Information details
|
|
info_all.append([entry_guid, entry_name, entry_version])
|
|
|
|
# Re-set Nested PFS Entry Version from Metadata
|
|
entries_all[index][2] = entry_version
|
|
|
|
# Parse all PFS Signature Entries/Descriptors
|
|
sign_start = 0 # Increasing PFS Signature Entry starting offset
|
|
while len(signature_info[sign_start:sign_start + info_hdr_size]) == info_hdr_size :
|
|
# Get PFS Information Header Structure info
|
|
entry_info_hdr = get_struct(signature_info, sign_start, PFS_INFO_HDR, None, pfs_padd + 8)
|
|
|
|
# Show PFS Information Header Structure info
|
|
if is_verbose : entry_info_hdr.pfs_print(pfs_padd + 8)
|
|
|
|
# Validate that a known PFS Information Header Version was encountered
|
|
if entry_info_hdr.HeaderVersion != 1 :
|
|
msg_print(pfs_padd + 8, 'Error: Unknown PFS Information Header Version %d!' % entry_info_hdr.HeaderVersion)
|
|
break # Skip PFS Signature Entries/Descriptors in case of unknown Header Version
|
|
|
|
# PFS Signature Entries/Descriptors have PFS_INFO_HDR + PFS_ENTRY_R* + Sign Size [0x2] + Sign Data [Sig Size]
|
|
pfs_entry_struct, pfs_entry_size = get_pfs_entry(signature_info, sign_start + info_hdr_size) # Get PFS Entry Info
|
|
|
|
# Get PFS Entry Header Structure info
|
|
entry_hdr = get_struct(signature_info, sign_start + info_hdr_size, pfs_entry_struct, None, pfs_padd + 8)
|
|
|
|
# Show PFS Information Header Structure info
|
|
if is_verbose : entry_hdr.pfs_print(pfs_padd + 12)
|
|
|
|
# Show PFS Signature Size & Data (after PFS_ENTRY_R*)
|
|
sign_info_start = sign_start + info_hdr_size + pfs_entry_size
|
|
sign_size = int.from_bytes(signature_info[sign_info_start:sign_info_start + 0x2], 'little')
|
|
sign_data_raw = signature_info[sign_info_start + 0x2:sign_info_start + 0x2 + sign_size]
|
|
sign_data_txt = '%0.*X' % (sign_size * 2, int.from_bytes(sign_data_raw, 'little'))
|
|
if is_verbose :
|
|
print('\n%sSignature Information:\n' % (' ' * (pfs_padd + 8)))
|
|
print('%sSignature Size : 0x%X' % (' ' * (pfs_padd + 12), sign_size))
|
|
print('%sSignature Data : %s [...]' % (' ' * (pfs_padd + 12), sign_data_txt[:32]))
|
|
|
|
# The next PFS Signature Entry/Descriptor starts after the previous Signature Data
|
|
sign_start += (info_hdr_size + pfs_entry_size + 0x2 + sign_size)
|
|
|
|
# Parse each PFS Entry Data for special types (zlib or PFAT)
|
|
for index in range(len(entries_all)) :
|
|
entry_data = entries_all[index][4] # Get PFS Entry Data
|
|
entry_type = entries_all[index][3] # Get PFS Entry Type
|
|
|
|
# Very small PFS Entry Data cannot be of special type
|
|
if len(entry_data) < dpfs_hdr_size : continue
|
|
|
|
# Check if PFS Entry contains zlib-compressed sub-PFS Volume
|
|
pfs_zlib_offsets = get_section_offsets(entry_data)
|
|
|
|
# Check if PFS Entry contains sub-PFS Volume with PFAT Payload
|
|
is_pfat = False # Initial PFAT state for sub-PFS Entry
|
|
_, pfat_entry_size = get_pfs_entry(entry_data, dpfs_hdr_size) # Get possible PFS PFAT Entry Size
|
|
pfat_hdr_off = dpfs_hdr_size + pfat_entry_size # Possible PFAT Header starts after PFS Header & Entry
|
|
pfat_entry_hdr = get_struct(entry_data, 0, PFS_DELL_HDR, None, pfs_padd + 8) # Possible PFS PFAT Entry
|
|
if len(entry_data) - pfat_hdr_off >= pfat_hdr_size :
|
|
pfat_hdr = get_struct(entry_data, pfat_hdr_off, PFS_PFAT_HDR, [0], pfs_padd + 8)
|
|
is_pfat = bytes(pfat_hdr.PlatformID).upper().startswith(b'DELL')
|
|
|
|
# Parse PFS Entry which contains sub-PFS Volume with PFAT Payload
|
|
if pfat_entry_hdr.Tag == b'PFS.HDR.' and is_pfat :
|
|
entry_type = 'PFAT' # Re-set PFS Entry Type from OTHER to PFAT, to use such info afterwards
|
|
|
|
entry_data = parse_pfat_pfs(pfat_entry_hdr, entry_data, pfs_padd) # Parse sub-PFS PFAT Volume
|
|
|
|
# Parse PFS Entry which contains zlib-compressed sub-PFS Volume
|
|
elif pfs_zlib_offsets :
|
|
entry_type = 'ZLIB' # Re-set PFS Entry Type from OTHER to ZLIB, to use such info afterwards
|
|
pfs_count += 1 # Increase the count/index of parsed main PFS structures by one
|
|
|
|
# Parse each sub-PFS ZLIB Section
|
|
for offset in pfs_zlib_offsets :
|
|
# Get the Name of the zlib-compressed full PFS structure via the already stored PFS Information
|
|
# The zlib-compressed full PFS structure(s) are used to contain multiple FW (CombineBiosNameX)
|
|
# When zlib-compressed full PFS structure(s) exist within the main/first full PFS structure,
|
|
# its PFS Information should contain their names (CombineBiosNameX). Since the main/first
|
|
# full PFS structure has count/index 1, the rest start at 2+ and thus, their PFS Information
|
|
# names can be retrieved in order by subtracting 2 from the main/first PFS Information values
|
|
sub_pfs_name = ' %s v%s' % (info_all[pfs_count - 2][1], info_all[pfs_count - 2][2]) if info_all else ' UNKNOWN'
|
|
|
|
# Set the sub-PFS output path (create sub-folders for each sub-PFS and its ZLIB sections)
|
|
sub_pfs_path = os.path.join(output_path, str(pfs_count) + sub_pfs_name)
|
|
|
|
# Recursively call the PFS ZLIB Section Parser function for the sub-PFS Volume (pfs_index = pfs_count)
|
|
pfs_section_parse(entry_data, offset, sub_pfs_path, sub_pfs_name, pfs_count, pfs_count, True, pfs_padd + 4)
|
|
|
|
entries_all[index][4] = entry_data # Adjust PFS Entry Data after parsing PFAT (same ZLIB raw data, not stored afterwards)
|
|
entries_all[index][3] = entry_type # Adjust PFS Entry Type from OTHER to PFAT or ZLIB (ZLIB is ignored at file extraction)
|
|
|
|
# Name & Store each PFS Entry/Component Data, Data Signature, Metadata, Metadata Signature
|
|
for entry_index in range(len(entries_all)) :
|
|
file_index = entries_all[entry_index][0]
|
|
file_guid = entries_all[entry_index][1]
|
|
file_version = entries_all[entry_index][2]
|
|
file_type = entries_all[entry_index][3]
|
|
file_data = entries_all[entry_index][4]
|
|
file_data_sig = entries_all[entry_index][5]
|
|
file_meta = entries_all[entry_index][6]
|
|
file_meta_sig = entries_all[entry_index][7]
|
|
|
|
# Give Names to special PFS Entries, not covered by PFS Information
|
|
if file_type == 'MODEL_INFO' :
|
|
file_name = 'Model Information'
|
|
elif file_type == 'NAME_INFO' :
|
|
file_name = 'Filename Information'
|
|
if not is_advanced : continue # Don't store Filename Information in non-advanced user mode
|
|
elif file_type == 'SIG_INFO' :
|
|
file_name = 'Signature Information'
|
|
if not is_advanced : continue # Don't store Signature Information in non-advanced user mode
|
|
else :
|
|
file_name = ''
|
|
|
|
# Most PFS Entry Names & Versions are found at PFS Information via their GUID
|
|
# Version can be found at PFS_ENTRY_R* but prefer PFS Information when possible
|
|
for info_index in range(len(info_all)) :
|
|
info_guid = info_all[info_index][0]
|
|
info_name = info_all[info_index][1]
|
|
info_version = info_all[info_index][2]
|
|
|
|
# Give proper Name & Version info if Entry/Information GUIDs match
|
|
if info_guid == file_guid :
|
|
file_name = info_name
|
|
file_version = info_version
|
|
|
|
info_all[info_index][0] = 'USED' # PFS with zlib-compressed sub-PFS use the same GUID
|
|
break # Break at 1st Name match to not rename again from next zlib-compressed sub-PFS with the same GUID
|
|
|
|
# For both advanced & non-advanced users, the goal is to store final/usable files only
|
|
# so empty or intermediate files such as sub-PFS, PFS w/ PFAT or zlib-PFS are skipped
|
|
# Main/First PFS CombineBiosNameX Metadata files must be kept for accurate Model Information
|
|
# All users should check these files in order to choose the correct CombineBiosNameX modules
|
|
write_files = [] # Initialize list of output PFS Entry files to be written/extracted
|
|
|
|
is_zlib = bool(file_type == 'ZLIB') # Determine if PFS Entry Data was zlib-compressed
|
|
|
|
if file_data and not is_zlib : write_files.append([file_data, 'data']) # PFS Entry Data Payload
|
|
if file_data_sig and is_advanced : write_files.append([file_data_sig, 'sign_data']) # PFS Entry Data Signature
|
|
if file_meta and (is_zlib or is_advanced) : write_files.append([file_meta, 'meta']) # PFS Entry Metadata Payload
|
|
if file_meta_sig and is_advanced : write_files.append([file_meta_sig, 'sign_meta']) # PFS Entry Metadata Signature
|
|
|
|
# Write/Extract PFS Entry files
|
|
for file in write_files :
|
|
pfs_file_write(file[0], file[1], file_type, output_path, pfs_padd, pfs_index, pfs_name, file_index, file_name, file_version, output_path)
|
|
|
|
# Get PFS Footer Data after PFS Header Payload
|
|
pfs_footer = buffer[dpfs_hdr_size + pfs_hdr.PayloadSize:dpfs_hdr_size + pfs_hdr.PayloadSize + dpfs_ftr_size]
|
|
|
|
# Analyze PFS Footer Structure
|
|
chk_pfs_ftr(pfs_footer, pfs_payload, pfs_hdr.PayloadSize, 'PFS', pfs_padd)
|
|
|
|
# Analyze Dell PFS Entry Structure
|
|
def parse_pfs_entry(entry_buffer, entry_start, entry_size, entry_struct, struct_args, text, padd) :
|
|
# Get PFS Entry Structure values
|
|
pfs_entry = get_struct(entry_buffer, entry_start, entry_struct, struct_args, padd + 4)
|
|
|
|
# Show PFS Entry Structure info
|
|
if is_verbose : pfs_entry.pfs_print(padd + 8)
|
|
|
|
# Validate that a known PFS Entry Header Version was encountered
|
|
chk_hdr_ver(pfs_entry.HeaderVersion, text, padd + 8)
|
|
|
|
# Validate that the PFS Entry Reserved field is empty
|
|
if pfs_entry.Reserved != 0 :
|
|
msg_print(padd + 8, 'Error: Detected non-empty %s Reserved field!' % text)
|
|
|
|
# Get PFS Entry Version string via "Version" and "VersionType" fields
|
|
entry_version = get_entry_ver(pfs_entry.Version, pfs_entry.VersionType, padd + 8)
|
|
|
|
# Get PFS Entry GUID in Big Endian format
|
|
entry_guid = '%0.*X' % (0x10 * 2, int.from_bytes(pfs_entry.GUID, 'little'))
|
|
|
|
# PFS Entry Data starts after the PFS Entry Structure
|
|
entry_data_start = entry_start + entry_size
|
|
entry_data_end = entry_data_start + pfs_entry.DataSize
|
|
|
|
# PFS Entry Data Signature starts after PFS Entry Data
|
|
entry_data_sig_start = entry_data_end
|
|
entry_data_sig_end = entry_data_sig_start + pfs_entry.DataSigSize
|
|
|
|
# PFS Entry Metadata starts after PFS Entry Data Signature
|
|
entry_met_start = entry_data_sig_end
|
|
entry_met_end = entry_met_start + pfs_entry.DataMetSize
|
|
|
|
# PFS Entry Metadata Signature starts after PFS Entry Metadata
|
|
entry_met_sig_start = entry_met_end
|
|
entry_met_sig_end = entry_met_sig_start + pfs_entry.DataMetSigSize
|
|
|
|
entry_data = entry_buffer[entry_data_start:entry_data_end] # Store PFS Entry Data
|
|
entry_data_sig = entry_buffer[entry_data_sig_start:entry_data_sig_end] # Store PFS Entry Data Signature
|
|
entry_met = entry_buffer[entry_met_start:entry_met_end] # Store PFS Entry Metadata
|
|
entry_met_sig = entry_buffer[entry_met_sig_start:entry_met_sig_end] # Store PFS Entry Metadata Signature
|
|
|
|
return pfs_entry, entry_version, entry_guid, entry_data, entry_data_sig, entry_met, entry_met_sig, entry_met_sig_end
|
|
|
|
# Parse Dell PFS Volume with PFAT Payload
|
|
def parse_pfat_pfs(entry_hdr, entry_data, padd) :
|
|
if is_verbose : print('\n%sPFS Volume:' % (' ' * (padd + 4)))
|
|
|
|
# Show sub-PFS Header Structure Info
|
|
if is_verbose : entry_hdr.pfs_print(padd + 12)
|
|
|
|
# Validate that a known sub-PFS Header Version was encountered
|
|
chk_hdr_ver(entry_hdr.HeaderVersion, 'sub-PFS', padd + 12)
|
|
|
|
# Get sub-PFS Payload Data
|
|
pfat_payload = entry_data[dpfs_hdr_size:dpfs_hdr_size + entry_hdr.PayloadSize]
|
|
|
|
# Get sub-PFS Footer Data after sub-PFS Header Payload (must be retrieved at the initial entry_data, before PFAT parsing)
|
|
pfat_footer = entry_data[dpfs_hdr_size + entry_hdr.PayloadSize:dpfs_hdr_size + entry_hdr.PayloadSize + dpfs_ftr_size]
|
|
|
|
# Parse all sub-PFS Payload PFAT Entries
|
|
pfat_data_all = [] # Storage for all sub-PFS PFAT Entries Order/Offset & Payload/Raw Data
|
|
pfat_entry_start = 0 # Increasing sub-PFS PFAT Entry start offset
|
|
pfat_entry_index = 0 # Increasing sub-PFS PFAT Entry count index
|
|
_, pfs_entry_size = get_pfs_entry(pfat_payload, 0) # Get initial PFS PFAT Entry Size for loop
|
|
while len(pfat_payload[pfat_entry_start:pfat_entry_start + pfs_entry_size]) == pfs_entry_size :
|
|
# Get sub-PFS PFAT Entry Structure & Size info
|
|
pfat_entry_struct, pfat_entry_size = get_pfs_entry(pfat_payload, pfat_entry_start)
|
|
|
|
# Analyze sub-PFS PFAT Entry Structure and get relevant info
|
|
pfat_entry,pfat_entry_version,pfat_entry_guid,pfat_entry_data,pfat_entry_data_sig,pfat_entry_met,pfat_entry_met_sig,pfat_next_entry = \
|
|
parse_pfs_entry(pfat_payload, pfat_entry_start, pfat_entry_size, pfat_entry_struct, None, 'sub-PFS PFAT Entry', padd + 4)
|
|
|
|
# Each sub-PFS PFAT Entry includes an AMI BIOS Guard (a.k.a. PFAT) block at the beginning
|
|
# We need to parse the PFAT block and remove its contents from the final Payload/Raw Data
|
|
pfat_hdr_off = pfat_entry_start + pfat_entry_size # PFAT block starts after PFS Entry
|
|
|
|
# Get sub-PFS PFAT Header Structure values
|
|
pfat_hdr = get_struct(pfat_payload, pfat_hdr_off, PFS_PFAT_HDR, [pfat_entry_index], padd + 12)
|
|
|
|
# Show sub-PFS PFAT Header Structure info
|
|
if is_verbose : pfat_hdr.pfs_print(padd + 16)
|
|
|
|
# Get PFAT Header Flags (SFAM, ProtectEC, GFXMitDis, FTU, Reserved)
|
|
pfat_flag_sig,_,_,_,_ = pfat_hdr.get_flags()
|
|
|
|
pfat_script_start = pfat_hdr_off + pfat_hdr_size # PFAT Block Script Start
|
|
pfat_script_end = pfat_script_start + pfat_hdr.ScriptSize # PFAT Block Script End
|
|
pfat_script_data = pfat_payload[pfat_script_start:pfat_script_end] # PFAT Block Script Data
|
|
pfat_payload_start = pfat_script_end # PFAT Block Payload Start (at Script end)
|
|
pfat_payload_end = pfat_script_end + pfat_hdr.DataSize # PFAT Block Data End
|
|
pfat_payload_data = pfat_payload[pfat_payload_start:pfat_payload_end] # PFAT Block Raw Data
|
|
pfat_hdr_bgs_size = pfat_hdr_size + pfat_hdr.ScriptSize # PFAT Block Header & Script Size
|
|
|
|
# The PFAT Script End should match the total Entry Data Size w/o PFAT block
|
|
if pfat_hdr_bgs_size != pfat_entry.DataSize - pfat_hdr.DataSize :
|
|
msg_print(padd + 16, 'Error: Detected sub-PFS PFAT Entry Header & PFAT Size mismatch!')
|
|
|
|
# Parse sub-PFS PFAT Signature, if applicable (only when PFAT Header > SFAM flag is set)
|
|
if pfat_flag_sig and len(pfat_payload[pfat_payload_end:pfat_payload_end + pfat_sig_size]) == pfat_sig_size :
|
|
# Get sub-PFS PFAT Signature Structure values
|
|
pfat_sig = get_struct(pfat_payload, pfat_payload_end, PFS_PFAT_SIG, [pfat_entry_index], padd + 12)
|
|
|
|
# Show sub-PFS PFAT Signature Structure info
|
|
if is_verbose : pfat_sig.pfs_print(padd + 16)
|
|
|
|
# Show PFAT Script via BIOS Guard Script Tool
|
|
# https://github.com/allowitsme/big-tool by Dmitry Frolov
|
|
if is_verbose :
|
|
print('\n%sPFAT Block %d Script:\n' % (' ' * (padd + 12), pfat_entry_index))
|
|
is_opcode_div = len(pfat_script_data) % 8 == 0
|
|
is_begin_end = pfat_script_data[:8] + pfat_script_data[-8:] == b'\x01' + b'\x00' * 7 + b'\xFF' + b'\x00' * 7
|
|
if is_opcode_div and is_begin_end and is_bgst :
|
|
pfat_script_decomp = BigScript(code_bytes=pfat_script_data)
|
|
pfat_script_lines = pfat_script_decomp.to_string().replace('\t',' ').split('\n')
|
|
for line in pfat_script_lines :
|
|
spacing = ' ' * (padd + 16) if line.endswith(('begin','end',':')) else ' ' * (padd + 24)
|
|
operands = [op for op in line.split(' ') if op != '']
|
|
print(spacing + ('{:<12s}' + '{:<11s}' * (len(operands) - 1)).format(*operands))
|
|
elif not is_opcode_div :
|
|
print('%sError: Script not divisible by OpCode length!' % (' ' * (padd + 16)))
|
|
elif not is_begin_end :
|
|
print('%sError: Script lacks Begin and/or End OpCodes!' % (' ' * (padd + 16)))
|
|
elif not is_bgst :
|
|
print('%sError: BIOS Guard Script Tool dependency missing!' % (' ' * (padd + 16)))
|
|
|
|
# The payload of sub-PFS PFAT Entries is not in proper order by default
|
|
# We can get each payload's order from PFAT Script > OpCode #2 (set I0 imm)
|
|
# PFAT Script OpCode #2 > Operand #3 stores the payload Offset in final image
|
|
pfat_entry_off = int.from_bytes(pfat_script_data[0xC:0x10], 'little')
|
|
|
|
# Parse sub-PFS PFAT Entry/Block Metadata
|
|
if len(pfat_entry_met) >= pfat_met_size :
|
|
# Get sub-PFS PFAT Metadata Structure values
|
|
pfat_met = get_struct(pfat_entry_met, 0, PFS_PFAT_MET, [pfat_entry_index], padd + 12)
|
|
|
|
# Show sub-PFS PFAT Metadata Structure info
|
|
if is_verbose : pfat_met.pfs_print(padd + 16)
|
|
|
|
# Another way to get each PFAT Entry payload's Order is from its Metadata at 0x8-0xC, if applicable
|
|
# Check that the PFAT Entry payload Order/Offset from PFAT Script matches the one from PFAT Metadata
|
|
if pfat_entry_off != pfat_met.OffsetBase :
|
|
msg_print(padd + 16, 'Error: Detected sub-PFS PFAT Entry Metadata & PFAT Base Offset mismatch!')
|
|
pfat_entry_off = pfat_met.OffsetBase # Prefer Offset from Metadata, in case PFAT Script differs
|
|
|
|
# Check that the PFAT Entry payload Size from PFAT Header matches the one from PFAT Metadata
|
|
if pfat_hdr.DataSize != pfat_met.BlockSize :
|
|
msg_print(padd + 16, 'Error: Detected sub-PFS PFAT Entry Metadata & PFAT Block Size mismatch!')
|
|
|
|
# Get sub-PFS Entry Raw Data by subtracting PFAT Header & Script from PFAT Entry Data
|
|
pfat_entry_data_raw = pfat_entry_data[pfat_hdr_bgs_size:]
|
|
|
|
# The sub-PFS Entry Raw Data (w/o PFAT Header & Script) should match with the PFAT Block payload
|
|
if pfat_entry_data_raw != pfat_payload_data :
|
|
msg_print(padd + 16, 'Error: Detected sub-PFS PFAT Entry w/o PFAT & PFAT Block Data mismatch!')
|
|
pfat_entry_data_raw = pfat_payload_data # Prefer Data from PFAT Block, in case PFAT Entry differs
|
|
|
|
# Store each sub-PFS PFAT Entry Order/Offset and Payload/Raw Data (w/o PFAT)
|
|
pfat_data_all.append((pfat_entry_off, pfat_entry_data_raw))
|
|
|
|
pfat_entry_start = pfat_next_entry # Next sub-PFS PFAT Entry starts after sub-PFS Entry Metadata Signature
|
|
|
|
pfat_entry_index += 1
|
|
|
|
pfat_data_all.sort() # Sort all sub-PFS PFAT Entries payloads/data based on their Order/Offset
|
|
|
|
entry_data = b'' # Initialize new sub-PFS Entry Data
|
|
for pfat_data in pfat_data_all : entry_data += pfat_data[1] # Merge all sub-PFS PFAT Entry Payload/Raw into the final sub-PFS Entry Data
|
|
|
|
# Verify that the Order/Offset of the last PFAT Entry w/ its Size matches the final sub-PFS Entry Data Size
|
|
if len(entry_data) != pfat_data_all[-1][0] + len(pfat_data_all[-1][1]) :
|
|
msg_print(padd + 8, 'Error: Detected sub-PFS PFAT Entry Buffer & Last Offset Size mismatch!')
|
|
|
|
# Analyze sub-PFS Footer Structure
|
|
chk_pfs_ftr(pfat_footer, pfat_payload, entry_hdr.PayloadSize, 'Sub-PFS', padd + 4)
|
|
|
|
return entry_data
|
|
|
|
# Get Dell PFS Entry Structure & Size via its Version
|
|
def get_pfs_entry(buffer, offset) :
|
|
pfs_entry_ver = int.from_bytes(buffer[offset + 0x10:offset + 0x14], 'little') # PFS Entry Version
|
|
|
|
if pfs_entry_ver == 1 : return PFS_ENTRY_R1, ctypes.sizeof(PFS_ENTRY_R1)
|
|
if pfs_entry_ver == 2 : return PFS_ENTRY_R2, ctypes.sizeof(PFS_ENTRY_R2)
|
|
|
|
return PFS_ENTRY_R2, ctypes.sizeof(PFS_ENTRY_R2)
|
|
|
|
# Determine Dell PFS Entry Version string
|
|
def get_entry_ver(version_fields, version_types, msg_padd) :
|
|
version = '' # Initialize Version string
|
|
|
|
# Each Version Type (1 byte) determines the type of each Version Value (2 bytes)
|
|
# Version Type 'N' is Number, 'A' is Text and ' ' is Empty/Unused
|
|
for idx in range(len(version_fields)) :
|
|
eol = '' if idx == len(version_fields) - 1 else '.'
|
|
|
|
if version_types[idx] == 65 : version += '%X%s' % (version_fields[idx], eol) # 0x41 = ASCII
|
|
elif version_types[idx] == 78 : version += '%d%s' % (version_fields[idx], eol) # 0x4E = Number
|
|
elif version_types[idx] in (0, 32) : version = version.strip('.') # 0x00 or 0x20 = Unused
|
|
else :
|
|
version += '%X%s' % (version_fields[idx], eol) # Unknown
|
|
msg_print(msg_padd, 'Error: Unknown PFS Entry Version Type 0x%0.2X!' % version_types[idx])
|
|
|
|
return version
|
|
|
|
# Check if Dell PFS Header Version is known
|
|
def chk_hdr_ver(version, text, padd) :
|
|
if version in (1,2) : return
|
|
|
|
msg_print(padd, 'Error: Unknown %s Header Version %d!' % (text, version))
|
|
|
|
# Analyze Dell PFS Footer Structure
|
|
def chk_pfs_ftr(footer_buffer, data_buffer, data_size, text, padd) :
|
|
# Get PFS Footer Structure values
|
|
pfs_ftr = get_struct(footer_buffer, 0, PFS_DELL_FTR, None, padd + 8)
|
|
|
|
# Validate that a PFS Footer was parsed
|
|
if pfs_ftr.Tag == b'PFS.FTR.' :
|
|
# Show PFS Footer Structure info
|
|
if is_verbose : pfs_ftr.pfs_print(padd + 8)
|
|
else :
|
|
msg_print(padd + 4, 'Error: %s Footer could not be found!' % text)
|
|
|
|
# Validate that PFS Header Payload Size matches the one at PFS Footer
|
|
if data_size != pfs_ftr.PayloadSize :
|
|
msg_print(padd + 4, 'Error: %s Header & Footer Payload Size mismatch!' % text)
|
|
|
|
# Calculate the PFS Payload Data CRC-32 w/ Vector 0
|
|
pfs_ftr_crc = ~zlib.crc32(data_buffer, 0) & 0xFFFFFFFF
|
|
|
|
# Validate PFS Payload Data Checksum via PFS Footer
|
|
if pfs_ftr.Checksum != pfs_ftr_crc :
|
|
msg_print(padd + 4, 'Error: Invalid %s Footer Payload Checksum!' % text)
|
|
|
|
# Write/Extract Dell PFS Entry Files (Data, Metadata, Signature)
|
|
def pfs_file_write(bin_buff, bin_name, bin_type, out_path, padd, pfs_idx, pfs_name, file_idx, file_name, file_ver, output_path) :
|
|
full_name = '%d%s -- %d %s v%s' % (pfs_idx, pfs_name, file_idx, file_name, file_ver) # Full PFS Entry Name
|
|
safe_name = re.sub(win_char_bad, '_', full_name) # Replace common Windows reserved/illegal filename characters
|
|
|
|
# Store Data/Metadata Signature (advanced users only)
|
|
if bin_name.startswith('sign') :
|
|
final_name = '%s.%s.sig' % (safe_name, bin_name.split('_')[1])
|
|
final_path = os.path.join(output_path, final_name)
|
|
|
|
with open(final_path, 'wb') as pfs_out : pfs_out.write(bin_buff) # Write final Data/Metadata Signature
|
|
|
|
return # Skip further processing for Signatures
|
|
|
|
# Store Data/Metadata Payload
|
|
bin_ext = '.%s.bin' % bin_name if is_advanced else '.bin' # Simpler Data/Metadata Extension for non-advanced users
|
|
|
|
# Some Data may be Text or XML files with useful information for non-advanced users
|
|
is_text,final_data,file_ext,write_mode = bin_is_text(bin_buff, bin_type, bin_name == 'meta', is_advanced, is_verbose, padd)
|
|
|
|
final_name = '%s%s' % (safe_name, bin_ext[:-4] + file_ext if is_text else bin_ext)
|
|
final_path = os.path.join(out_path, final_name)
|
|
|
|
with open(final_path, write_mode) as pfs_out : pfs_out.write(final_data) # Write final Data/Metadata Payload
|
|
|
|
# Check if Dell PFS Entry file/data is Text/XML and Convert
|
|
def bin_is_text(buffer, file_type, is_metadata, is_advanced, is_verbose, pfs_padd) :
|
|
is_text = False
|
|
write_mode = 'wb'
|
|
extension = '.bin'
|
|
buffer_in = buffer
|
|
|
|
if b',END' in buffer[-0x8:] : # Text Type 1
|
|
is_text = True
|
|
write_mode = 'w'
|
|
extension = '.txt'
|
|
buffer = buffer.decode('utf-8').split(',END')[0].replace(';','\n')
|
|
elif buffer.startswith(b'VendorName=Dell') : # Text Type 2
|
|
is_text = True
|
|
write_mode = 'w'
|
|
extension = '.txt'
|
|
buffer = buffer.split(b'\x00')[0].decode('utf-8').replace(';','\n')
|
|
elif b'<Rimm x-schema="' in buffer[:0x50] : # XML Type
|
|
is_text = True
|
|
write_mode = 'w'
|
|
extension = '.xml'
|
|
buffer = buffer.decode('utf-8')
|
|
elif file_type in ('NESTED_PFS','ZLIB') and is_metadata and len(buffer) == meta_hdr_size : # Text Type 3
|
|
is_text = True
|
|
write_mode = 'w'
|
|
extension = '.txt'
|
|
buffer = get_struct(buffer, 0, PFS_META_HDR, None, pfs_padd + 8).pfs_write()
|
|
|
|
# Show Model/PCR XML Information, if applicable
|
|
if is_verbose and is_text and not is_metadata : # Metadata is shown at initial PFS_META_HDR analysis
|
|
print('\n%sPFS %s Information:\n' % (' ' * (pfs_padd + 8), {'.txt': 'Model', '.xml': 'PCR XML'}[extension]))
|
|
_ = [print('%s%s' % (' ' * (pfs_padd + 12), line.strip('\r'))) for line in buffer.split('\n') if line]
|
|
|
|
# Only for non-advanced users due to signature (.sig) invalidation
|
|
if is_advanced : return False, buffer_in, '.bin', 'wb'
|
|
|
|
return is_text, buffer, extension, write_mode
|
|
|
|
# Calculate Checksum XOR 8 of data
|
|
def chk_xor_8(data, init_value) :
|
|
value = init_value
|
|
for byte in data : value = value ^ byte
|
|
value ^= 0x0
|
|
|
|
return value
|
|
|
|
# Show (padded) Message/Log
|
|
def msg_print(padd, msg) :
|
|
print('\n%s%s' % (' ' * (padd if is_verbose else 4), msg))
|
|
|
|
# Process ctypes Structure Classes
|
|
# https://github.com/skochinsky/me-tools/blob/master/me_unpack.py by Igor Skochinsky
|
|
def get_struct(buffer, start_offset, class_name, param_list, msg_padd) :
|
|
if param_list is None : param_list = []
|
|
|
|
structure = class_name(*param_list) # Unpack parameter list
|
|
struct_len = ctypes.sizeof(structure)
|
|
struct_data = buffer[start_offset:start_offset + struct_len]
|
|
fit_len = min(len(struct_data), struct_len)
|
|
|
|
if (start_offset >= len(buffer)) or (fit_len < struct_len) :
|
|
msg_print(msg_padd, 'Error: Invalid offset 0x%X at %s, possibly incomplete buffer!' % (start_offset, class_name.__name__))
|
|
sys.exit(1) # Critical error
|
|
|
|
ctypes.memmove(ctypes.addressof(structure), struct_data, fit_len)
|
|
|
|
return structure
|
|
|
|
# Get absolute file path (argparse object)
|
|
def get_absolute_path(argparse_path) :
|
|
if not argparse_path :
|
|
absolute_path = get_script_dir() # Use input file directory if no user path is specified
|
|
else :
|
|
# Check if user specified path is absolute, otherwise convert it to input file relative
|
|
if pathlib.Path(argparse_path).is_absolute() : absolute_path = argparse_path
|
|
else : absolute_path = os.path.join(get_script_dir(), argparse_path)
|
|
|
|
return absolute_path
|
|
|
|
# Get list of files from absolute path
|
|
def get_path_files(abs_path) :
|
|
file_list = [] # Initialize list of files
|
|
|
|
# Traverse input absolute path
|
|
for root,_,files in os.walk(abs_path):
|
|
file_list = [os.path.join(root, name) for name in files]
|
|
|
|
return file_list
|
|
|
|
# Get python script working directory
|
|
# https://stackoverflow.com/a/22881871 by jfs
|
|
def get_script_dir(follow_symlinks=True) :
|
|
if getattr(sys, 'frozen', False) :
|
|
path = os.path.abspath(sys.executable)
|
|
else :
|
|
path = inspect.getabsfile(get_script_dir)
|
|
if follow_symlinks :
|
|
path = os.path.realpath(path)
|
|
|
|
return os.path.dirname(path)
|
|
|
|
# Pause after any unexpected Python exception
|
|
# https://stackoverflow.com/a/781074 by Torsten Marek
|
|
def show_exception_and_exit(exc_type, exc_value, tb) :
|
|
if exc_type is KeyboardInterrupt :
|
|
print('\n')
|
|
else :
|
|
print('\nError: %s crashed, please report the following:\n' % title)
|
|
traceback.print_exception(exc_type, exc_value, tb)
|
|
if not bool(args.auto_exit) : input('\nPress enter to exit')
|
|
|
|
sys.exit(1) # Crash exceptions are critical
|
|
|
|
# Show script title
|
|
print('\n' + title)
|
|
|
|
# Set console/shell window title
|
|
user_os = sys.platform
|
|
if user_os == 'win32' : ctypes.windll.kernel32.SetConsoleTitleW(title)
|
|
elif user_os.startswith('linux') or user_os == 'darwin' or user_os.find('bsd') != -1 : sys.stdout.write('\x1b]2;' + title + '\x07')
|
|
|
|
# Set argparse Arguments
|
|
parser = argparse.ArgumentParser()
|
|
parser.add_argument('images', type=argparse.FileType('r'), nargs='*')
|
|
parser.add_argument('-a', '--advanced', help='extract in advanced user mode', action='store_true')
|
|
parser.add_argument('-v', '--verbose', help='show PFS structure information', action='store_true')
|
|
parser.add_argument('-e', '--auto-exit', help='skip press enter to exit prompts', action='store_true')
|
|
parser.add_argument('-o', '--output-dir', help='extract in given output directory')
|
|
parser.add_argument('-i', '--input-dir', help='extract from given input directory')
|
|
args = parser.parse_args()
|
|
|
|
# Set pause-able Python exception handler (must be after args)
|
|
sys.excepthook = show_exception_and_exit
|
|
|
|
# Get ctypes Structure Sizes
|
|
dpfs_hdr_size = ctypes.sizeof(PFS_DELL_HDR)
|
|
dpfs_ftr_size = ctypes.sizeof(PFS_DELL_FTR)
|
|
info_hdr_size = ctypes.sizeof(PFS_INFO_HDR)
|
|
name_hdr_size = ctypes.sizeof(PFS_NAME_HDR)
|
|
meta_hdr_size = ctypes.sizeof(PFS_META_HDR)
|
|
pfat_hdr_size = ctypes.sizeof(PFS_PFAT_HDR)
|
|
pfat_sig_size = ctypes.sizeof(PFS_PFAT_SIG)
|
|
pfat_met_size = ctypes.sizeof(PFS_PFAT_MET)
|
|
|
|
# The Dell ThinOS PKG update images usually contain multiple sections. Each section starts with a
|
|
# 0x30 sized header, which begins with pattern 72135500. The section length is found at 0x10-0x14
|
|
# and its (optional) MD5 hash at 0x20-0x30. The section data can be raw or LZMA2 (7zXZ) compressed.
|
|
# The LZMA2 section includes the actual Dell PFS update image, so it needs to be decompressed first.
|
|
lzma_pkg_header = re.compile(br'\x72\x13\x55\x00.{45}\x37\x7A\x58\x5A', re.DOTALL)
|
|
|
|
# The Dell PFS update images usually contain multiple sections. Each section is zlib-compressed
|
|
# with header pattern ********++EEAA761BECBB20F1E651--789C where ******** is the zlib stream size,
|
|
# ++ is the section type and -- the header Checksum XOR 8. The "Firmware" section has type AA and its
|
|
# files are stored in PFS format. The "Utility" section has type BB and its files are stored in PFS,
|
|
# BIN or 7z formats. Each section is followed by the footer pattern ********EEAAEE8F491BE8AE143790--
|
|
# where ******** is the zlib stream size and ++ the footer Checksum XOR 8.
|
|
pfs_zlib_header = re.compile(br'\xEE\xAA\x76\x1B\xEC\xBB\x20\xF1\xE6\x51.\x78\x9C', re.DOTALL)
|
|
pfs_zlib_footer = re.compile(br'\xEE\xAA\xEE\x8F\x49\x1B\xE8\xAE\x14\x37\x90')
|
|
|
|
# Dell PFS ZLIB Section Type & Name Dictionary
|
|
section_dict = {0xAA : 'Firmware', 0xBB : 'Utilities'}
|
|
|
|
# Illegal/Reserved Windows filename characters
|
|
win_char_bad = r'[\\/*?:"<>|]'
|
|
|
|
# Initialize Dell PFS input file list
|
|
pfs_input_images = []
|
|
|
|
# Process input files
|
|
if len(sys.argv) >= 2 :
|
|
# Drag & Drop or CLI
|
|
if args.input_dir :
|
|
input_path_user = get_absolute_path(args.input_dir)
|
|
pfs_input_images = get_path_files(input_path_user)
|
|
else :
|
|
pfs_input_images = [image.name for image in args.images]
|
|
else :
|
|
# Script w/o parameters
|
|
input_path_user = get_absolute_path(input('\nEnter input directory path: '))
|
|
pfs_input_images = get_path_files(input_path_user)
|
|
|
|
# Initialize global variables
|
|
exit_code = len(pfs_input_images) # Initialize exit code with input file count
|
|
is_advanced = bool(args.advanced) # Set Advanced user mode optional argument
|
|
is_verbose = bool(args.verbose) # Set Verbose output mode optional argument
|
|
|
|
# Initialize Dell PFS Update Extractor
|
|
if __name__ == '__main__':
|
|
sys.exit(main(exit_code, pfs_input_images)) |