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Update gcmtool.py

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adding security checks
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tmpz23 2022-01-18 19:47:47 +01:00 committed by GitHub
parent ae15654732
commit 0a02901f6e
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1 changed files with 32 additions and 22 deletions
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gcmtool.py
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@ -3,7 +3,7 @@ from pathlib import Path
import logging import logging
__version__ = "0.0.9" __version__ = "0.0.10"
__author__ = "rigodron, algoflash, GGLinnk" __author__ = "rigodron, algoflash, GGLinnk"
__license__ = "MIT" __license__ = "MIT"
__status__ = "developpement" __status__ = "developpement"
@ -215,6 +215,7 @@ class Gcm:
bootbin = BootBin(iso_file.read(BootBin.LEN)) bootbin = BootBin(iso_file.read(BootBin.LEN))
if bootbin.dvd_magic() != Gcm.DVD_MAGIC: if bootbin.dvd_magic() != Gcm.DVD_MAGIC:
raise Exception("Invalid DVD format - this tool is for ISO/GCM files") raise Exception("Invalid DVD format - this tool is for ISO/GCM files")
bi2bin_data = iso_file.read(Gcm.BI2BIN_LEN) bi2bin_data = iso_file.read(Gcm.BI2BIN_LEN)
iso_file.seek(Gcm.APPLOADERSIZE_OFFSET) iso_file.seek(Gcm.APPLOADERSIZE_OFFSET)
@ -237,14 +238,15 @@ class Gcm:
dolheader_data = iso_file.read(Dol.HEADER_LEN) dolheader_data = iso_file.read(Dol.HEADER_LEN)
dol_len = dol.get_dol_len( dolheader_data ) dol_len = dol.get_dol_len( dolheader_data )
bootdol_data = dolheader_data + iso_file.read( dol_len - Dol.HEADER_LEN ) bootdol_data = dolheader_data + iso_file.read( dol_len - Dol.HEADER_LEN )
if folder_path != Path("."):
base_path = folder_path
else:
base_path = Path(f"{bootbin.game_code()}-{bootbin.disc_number():02}")
logging.info(f"unpacking \"{iso_path}\" in \"{base_path}\"") if folder_path == Path("."):
sys_path = base_path / "sys" folder_path = Path(f"{bootbin.game_code()}-{bootbin.disc_number():02}")
sys_path.mkdir(parents=True, exist_ok=True) if folder_path.is_dir():
raise Exception(f"Error - \"{folder_path}\" already exist. Remove this folder or use another name for the unpack folder.")
logging.info(f"unpacking \"{iso_path}\" in \"{folder_path}\"")
sys_path = folder_path / "sys"
sys_path.mkdir(parents=True)
logging.debug(f"{iso_path}(0x0:0x{BootBin.LEN:x}) -> {sys_path / 'boot.bin'}") logging.debug(f"{iso_path}(0x0:0x{BootBin.LEN:x}) -> {sys_path / 'boot.bin'}")
(sys_path / "boot.bin").write_bytes(bootbin.data()) (sys_path / "boot.bin").write_bytes(bootbin.data())
@ -257,8 +259,8 @@ class Gcm:
logging.debug(f"{iso_path}(0x{dol_offset:x}:0x{dol_offset + dol_len:x}) -> {sys_path / 'boot.dol'}") logging.debug(f"{iso_path}(0x{dol_offset:x}:0x{dol_offset + dol_len:x}) -> {sys_path / 'boot.dol'}")
(sys_path / "boot.dol").write_bytes(bootdol_data) (sys_path / "boot.dol").write_bytes(bootdol_data)
root_path = base_path / "root" root_path = folder_path / "root"
root_path.mkdir(exist_ok=True) root_path.mkdir()
# And now we parse FST data to unpack all files in the GCM iso file # And now we parse FST data to unpack all files in the GCM iso file
dir_id_path = {0: root_path} dir_id_path = {0: root_path}
@ -299,29 +301,33 @@ class Gcm:
def pack(self, folder_path:Path, iso_path:Path = None): def pack(self, folder_path:Path, iso_path:Path = None):
if iso_path == None: if iso_path == None:
iso_path = folder_path.parent / Path(folder_path.name).with_suffix(".iso") iso_path = folder_path.parent / Path(folder_path.name).with_suffix(".iso")
with iso_path.open("wb") as iso_file: if iso_path.is_file():
logging.debug(f"{folder_path / 'sys' / 'boot.bin'} -> {iso_path}(0x0:0x{BootBin.LEN:x})") raise Exception(f"Error - {iso_path} already exist. Remove this file or use another GCM file name.")
logging.debug(f"{folder_path / 'sys' / 'bi2.bin'} -> {iso_path}(0x{BootBin.LEN:x}:0x{Gcm.APPLOADER_OFFSET:x})")
logging.debug(f"{folder_path / 'sys' / 'apploader.img'} -> {iso_path}(0x{Gcm.APPLOADER_OFFSET:x}:0x{Gcm.APPLOADER_OFFSET + (folder_path / 'sys' / 'apploader.img').stat().st_size:x}")
bootbin = BootBin((folder_path / "sys" / "boot.bin").read_bytes()) with iso_path.open("wb") as iso_file:
sys_path = folder_path / "sys"
logging.debug(f"{sys_path / 'boot.bin'} -> {iso_path}(0x0:0x{BootBin.LEN:x})")
logging.debug(f"{sys_path / 'bi2.bin'} -> {iso_path}(0x{BootBin.LEN:x}:0x{Gcm.APPLOADER_OFFSET:x})")
logging.debug(f"{sys_path / 'apploader.img'} -> {iso_path}(0x{Gcm.APPLOADER_OFFSET:x}:0x{Gcm.APPLOADER_OFFSET + (sys_path / 'apploader.img').stat().st_size:x}")
bootbin = BootBin((sys_path / "boot.bin").read_bytes())
iso_file.write(bootbin.data()) iso_file.write(bootbin.data())
iso_file.write((folder_path / "sys" / "bi2.bin").read_bytes()) iso_file.write((sys_path / "bi2.bin").read_bytes())
iso_file.write((folder_path / "sys" / "apploader.img").read_bytes()) iso_file.write((sys_path / "apploader.img").read_bytes())
fstbin_offset = bootbin.fstbin_offset() fstbin_offset = bootbin.fstbin_offset()
fstbin_len = bootbin.fstbin_len() fstbin_len = bootbin.fstbin_len()
if (folder_path / "sys" / "fst.bin").stat().st_size != fstbin_len: if (sys_path / "fst.bin").stat().st_size != fstbin_len:
raise Exception(f"Invalid fst.bin size in boot.bin offset 0x{BootBin.FSTLEN_OFFSET:x}:0x{BootBin.FSTLEN_OFFSET+4:x}!") raise Exception(f"Invalid fst.bin size in boot.bin offset 0x{BootBin.FSTLEN_OFFSET:x}:0x{BootBin.FSTLEN_OFFSET+4:x}!")
logging.debug(f"{folder_path / 'sys' / 'fst.bin'} -> {iso_path}(0x{fstbin_offset:x}:0x{fstbin_offset + fstbin_len:x})") logging.debug(f"{sys_path / 'fst.bin'} -> {iso_path}(0x{fstbin_offset:x}:0x{fstbin_offset + fstbin_len:x})")
iso_file.seek( fstbin_offset ) iso_file.seek( fstbin_offset )
fstbin_data = (folder_path / "sys" / "fst.bin").read_bytes() fstbin_data = (sys_path / "fst.bin").read_bytes()
iso_file.write( fstbin_data ) iso_file.write( fstbin_data )
dol_offset = bootbin.dol_offset() dol_offset = bootbin.dol_offset()
logging.debug(f"{folder_path / 'sys' / 'boot.dol'} -> {iso_path}(0x{dol_offset:x}:0x{dol_offset + (folder_path / 'sys' / 'boot.dol').stat().st_size:x})") logging.debug(f"{sys_path / 'boot.dol'} -> {iso_path}(0x{dol_offset:x}:0x{dol_offset + (sys_path / 'boot.dol').stat().st_size:x})")
iso_file.seek( dol_offset ) iso_file.seek( dol_offset )
iso_file.write( (folder_path / "sys" / "boot.dol").read_bytes() ) iso_file.write( (sys_path / "boot.dol").read_bytes() )
# Now parse fst.bin for writing files in the iso # Now parse fst.bin for writing files in the iso
dir_id_path = {0: folder_path / "root"} dir_id_path = {0: folder_path / "root"}
@ -334,6 +340,10 @@ class Gcm:
# go to parent when id reach next dir # go to parent when id reach next dir
nextdir_arr = [ nextdir ] nextdir_arr = [ nextdir ]
# Check if there is new / removed files or dirs in the root folder
if nextdir - 1 != len(list(currentdir_path.glob("**/*"))):
raise Exception(f"Error - Invalid file count inside {currentdir_path}. Use --rebuild-fst to update the FST before packing.")
for id in range(1, base_names // 12): for id in range(1, base_names // 12):
i = id * 12 i = id * 12
file_type = int.from_bytes(fstbin_data[i:i+1], "big", signed=False) file_type = int.from_bytes(fstbin_data[i:i+1], "big", signed=False)
@ -400,7 +410,7 @@ def get_argparser():
parser = argparse.ArgumentParser(description='ISO/GCM packer & unpacker - [GameCube] v' + __version__) parser = argparse.ArgumentParser(description='ISO/GCM packer & unpacker - [GameCube] v' + __version__)
parser.add_argument('--version', action='version', version='%(prog)s ' + __version__) parser.add_argument('--version', action='version', version='%(prog)s ' + __version__)
parser.add_argument('-v', '--verbose', action='store_true', help='verbose mode') parser.add_argument('-v', '--verbose', action='store_true', help='verbose mode')
parser.add_argument('-a', '--align', type=int, help='alignment of files in the GCM ISO 4 32000', default=4) parser.add_argument('-a', '--align', type=int, help='-a=10: alignment of files in the GCM ISO (default value is 4)', default=4)
parser.add_argument('input_path', metavar='INPUT', help='') parser.add_argument('input_path', metavar='INPUT', help='')
parser.add_argument('output_path', metavar='OUTPUT', help='', nargs='?', default="") parser.add_argument('output_path', metavar='OUTPUT', help='', nargs='?', default="")