BIOSUtilities/Panasonic_BIOS_Extract.py

#!/usr/bin/env python3 -B
# coding=utf-8

"""
Panasonic BIOS Extract
Panasonic BIOS Package Extractor
Copyright (C) 2018-2024 Plato Mavropoulos
"""

import io
import logging
import os

import pefile

from dissect.util.compression import lznt1

from common.comp_szip import is_szip_supported, szip_decompress
from common.path_ops import get_path_files, make_dirs, path_stem, safe_name
from common.pe_ops import get_pe_file, get_pe_info, is_pe_file, show_pe_info
from common.patterns import PAT_MICROSOFT_CAB
from common.system import printer
from common.templates import BIOSUtility
from common.text_ops import file_to_bytes

from AMI_PFAT_Extract import is_ami_pfat, parse_pfat_file

TITLE = 'Panasonic BIOS Package Extractor v3.0'


def is_panasonic_pkg(in_file):
    """ Check if input is Panasonic BIOS Package PE """

    in_buffer = file_to_bytes(in_file)

    pe_file = get_pe_file(in_buffer, silent=True)

    if not pe_file:
        return False

    pe_info = get_pe_info(pe_file, silent=True)

    if not pe_info:
        return False

    if pe_info.get(b'FileDescription', b'').upper() != b'UNPACK UTILITY':
        return False

    if not PAT_MICROSOFT_CAB.search(in_buffer):
        return False

    return True


def panasonic_cab_extract(buffer, extract_path, padding=0):
    """ Search and Extract Panasonic BIOS Package PE CAB archive """

    pe_path, pe_file, pe_info = [None] * 3

    cab_bgn = PAT_MICROSOFT_CAB.search(buffer).start()
    cab_len = int.from_bytes(buffer[cab_bgn + 0x8:cab_bgn + 0xC], 'little')
    cab_end = cab_bgn + cab_len

    cab_bin = buffer[cab_bgn:cab_end]

    cab_tag = f'[0x{cab_bgn:06X}-0x{cab_end:06X}]'

    cab_path = os.path.join(extract_path, f'CAB_{cab_tag}.cab')

    with open(cab_path, 'wb') as cab_file:
        cab_file.write(cab_bin)  # Store CAB archive

    if is_szip_supported(cab_path, padding, check=True):
        printer(f'Panasonic BIOS Package > PE > CAB {cab_tag}', padding)

        if szip_decompress(cab_path, extract_path, 'CAB', padding + 4, check=True) == 0:
            os.remove(cab_path)  # Successful extraction, delete CAB archive
        else:
            return pe_path, pe_file, pe_info
    else:
        return pe_path, pe_file, pe_info

    for file_path in get_path_files(extract_path):
        pe_file = get_pe_file(file_path, padding, silent=True)

        if pe_file:
            pe_info = get_pe_info(pe_file, padding, silent=True)

            if pe_info.get(b'FileDescription', b'').upper() == b'BIOS UPDATE':
                pe_path = file_path

                break
    else:
        return pe_path, pe_file, pe_info

    return pe_path, pe_file, pe_info


def panasonic_res_extract(pe_name, pe_file, extract_path, padding=0):
    """ Extract & Decompress Panasonic BIOS Update PE RCDATA (LZNT1) """

    is_rcdata = False

    # When fast_load is used, IMAGE_DIRECTORY_ENTRY_RESOURCE must be parsed prior to RCDATA Directories
    pe_file.parse_data_directories(directories=[pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_RESOURCE']])

    # Parse all Resource Data Directories > RCDATA (ID = 10)
    for entry in pe_file.DIRECTORY_ENTRY_RESOURCE.entries:
        if entry.struct.name == 'IMAGE_RESOURCE_DIRECTORY_ENTRY' and entry.struct.Id == 0xA:
            is_rcdata = True

            for resource in entry.directory.entries:
                res_bgn = resource.directory.entries[0].data.struct.OffsetToData
                res_len = resource.directory.entries[0].data.struct.Size
                res_end = res_bgn + res_len

                res_bin = pe_file.get_data(res_bgn, res_len)

                res_tag = f'{pe_name} [0x{res_bgn:06X}-0x{res_end:06X}]'

                res_out = os.path.join(extract_path, f'{res_tag}')

                printer(res_tag, padding + 4)

                try:
                    res_raw = lznt1.decompress(res_bin[0x8:])

                    if len(res_raw) != int.from_bytes(res_bin[0x4:0x8], 'little'):
                        raise ValueError('LZNT1_DECOMPRESS_BAD_SIZE')

                    printer('Succesfull LZNT1 decompression via Dissect!', padding + 8)
                except Exception as error:  # pylint: disable=broad-except
                    logging.debug('Error: LZNT1 decompression of %s failed: %s', res_tag, error)

                    res_raw = res_bin

                    printer('Succesfull PE Resource extraction!', padding + 8)

                # Detect & Unpack AMI BIOS Guard (PFAT) BIOS image
                if is_ami_pfat(res_raw):
                    pfat_dir = os.path.join(extract_path, res_tag)

                    parse_pfat_file(res_raw, pfat_dir, padding + 12)
                else:
                    if is_pe_file(res_raw):
                        res_ext = 'exe'
                    elif res_raw.startswith(b'[') and res_raw.endswith((b'\x0D\x0A', b'\x0A')):
                        res_ext = 'txt'
                    else:
                        res_ext = 'bin'

                    if res_ext == 'txt':
                        printer(new_line=False)

                        for line in io.BytesIO(res_raw).readlines():
                            line_text = line.decode('utf-8', 'ignore').rstrip()

                            printer(line_text, padding + 12, new_line=False)

                    with open(f'{res_out}.{res_ext}', 'wb') as out_file:
                        out_file.write(res_raw)

    return is_rcdata


def panasonic_img_extract(pe_name, pe_path, pe_file, extract_path, padding=0):
    """ Extract Panasonic BIOS Update PE Data when RCDATA is not available """

    pe_data = file_to_bytes(pe_path)

    sec_bgn = pe_file.OPTIONAL_HEADER.DATA_DIRECTORY[pefile.DIRECTORY_ENTRY[
        'IMAGE_DIRECTORY_ENTRY_SECURITY']].VirtualAddress

    img_bgn = pe_file.OPTIONAL_HEADER.BaseOfData + pe_file.OPTIONAL_HEADER.SizeOfInitializedData
    img_end = sec_bgn or len(pe_data)

    img_bin = pe_data[img_bgn:img_end]

    img_tag = f'{pe_name} [0x{img_bgn:X}-0x{img_end:X}]'

    img_out = os.path.join(extract_path, f'{img_tag}.bin')

    printer(img_tag, padding + 4)

    with open(img_out, 'wb') as out_img:
        out_img.write(img_bin)

    printer('Succesfull PE Data extraction!', padding + 8)

    return bool(img_bin)


def panasonic_pkg_extract(input_file, extract_path, padding=0):
    """ Parse & Extract Panasonic BIOS Package PE """

    input_buffer = file_to_bytes(input_file)

    make_dirs(extract_path, delete=True)

    pkg_pe_file = get_pe_file(input_buffer, padding)

    if not pkg_pe_file:
        return 2

    pkg_pe_info = get_pe_info(pkg_pe_file, padding)

    if not pkg_pe_info:
        return 3

    pkg_pe_name = path_stem(input_file)

    printer(f'Panasonic BIOS Package > PE ({pkg_pe_name})\n', padding)

    show_pe_info(pkg_pe_info, padding + 4)

    upd_pe_path, upd_pe_file, upd_pe_info = panasonic_cab_extract(input_buffer, extract_path, padding + 4)

    if not (upd_pe_path and upd_pe_file and upd_pe_info):
        return 4

    upd_pe_name = safe_name(path_stem(upd_pe_path))

    printer(f'Panasonic BIOS Update > PE ({upd_pe_name})\n', padding + 12)

    show_pe_info(upd_pe_info, padding + 16)

    is_upd_res, is_upd_img = False, False

    is_upd_res = panasonic_res_extract(upd_pe_name, upd_pe_file, extract_path, padding + 16)

    if not is_upd_res:
        is_upd_img = panasonic_img_extract(upd_pe_name, upd_pe_path, upd_pe_file, extract_path, padding + 16)

    os.remove(upd_pe_path)

    return 0 if is_upd_res or is_upd_img else 1


if __name__ == '__main__':
    BIOSUtility(title=TITLE, check=is_panasonic_pkg, main=panasonic_pkg_extract).run_utility()