def decompile_pyc(
arg_tuple: Tuple[pathlib.Path, Dict[str, int],
Dict[str, Union[bool, os.PathLike]]]
) -> str:
"""Decompile a single Python bytecode file.
Parameters
----------
arg_tuple: Tuple[pathlib.Path, Dict[str, int], Dict[str, Union[bool, os.PathLike]]]
A tuple containing the arguments for this function. This is a tuple because pebble's
Pool.map() function couldn't pass multiple arguments to a subprocessed function call.
The tuple entries correspond to the following arguments:
pyc_file : pathlib.Path
The path to the compiled Python file
alternate_opmap : Dict[str, int], optional
If this bytecode file was produced by an interpreter with remapped
opcodes, you must provide the opmap as a OPNAME: OPCODE dictionary
logging_options: Dict[str, Union[bool, os.PathLike], optional
A dictionary of logging options. This is only needed when pydecipher is
performing multi-processed decompilation. The keys can be the following
strings:
verbose: bool
True will enable verbose logging.
quiet: bool
True will silence all console logging.
log_path: pathlib.Path
If a path object is passed in as the log_path, the running
instance of pydecipher will continue logging to that file.
Returns
-------
str
There are several different return values:
* **no_action**: This file was not decompiled.
* **success**: This file was successfully decompiled.
* **error**: This file could not be decompiled 100% successfully.
* **opcode_error**: The error message returned by uncompyle6
indicates this file may have remapped opcodes
"""
pyc_file: pathlib.Path = arg_tuple[0]
alternate_opmap: Dict[str, int] = arg_tuple[1] or None
logging_options: Dict[str, Union[bool, os.PathLike]] = arg_tuple[2] or None
if not pyc_file.is_file():
return "no_action"
# Because this function runs in a new pydecipher process entirely, logging
# options set during runtime (from command-line flags) do not carry over
# automatically. We must pass these through manually, and reset the options
# for this specific process.
if logging_options and not pydecipher.log_path:
pydecipher.set_logging_options(**logging_options)
hijacked_stdout: io.StringIO = io.StringIO()
hijacked_stderr: io.StringIO = io.StringIO()
with redirect_stdout(hijacked_stdout), redirect_stderr(hijacked_stderr):
# Chop off c in pyc
new_file_name: pathlib.Path = pathlib.Path(
str(pyc_file.resolve())[:-1])
# This prohibits the overwriting of existing files.
# if new_file_name.exists() and new_file_name.stat().st_size:
# return "no_action"
logger.debug(
f"[*] Decompiling file {pyc_file} of size {pyc_file.stat().st_size}"
)
if not alternate_opmap:
try:
uncompyle6.decompile_file(str(pyc_file), outstream=sys.stdout)
except uncompyle6.semantics.parser_error.ParserError as e:
logger.warning(f"[!] Failed to decompile file {pyc_file}")
if REMAPPED_OPCODE_ERROR_REGEX.match(str(e.error)):
logger.error(
f"[!] {pyc_file.name} failed to decompile with an error that indicate its opcode "
"mappings may have been remapped to prevent analysis.")
return "opcode_error"
return "error"
except Exception as e:
e: Exception
logger.error(
f"[!] Failed to decompile file {pyc_file} with error: {e}")
stdout_val: str = hijacked_stdout.getvalue()
if stdout_val:
with new_file_name.open("w") as file_ptr:
file_ptr.write(stdout_val)
return "error"
else:
with new_file_name.open("w") as file_ptr:
file_ptr.write(hijacked_stdout.getvalue())
logger.info(f"[+] Successfully decompiled {pyc_file}")
return "success"
else:
filename: str
co: CodeType # can also be xdis.Code* objects
version: float
timestamp: int # seconds since epoch
magic_int: int
is_pypy: bool
source_size: int
sip_hash: str
try:
(
filename,
co,
version,
timestamp,
magic_int,
is_pypy,
source_size,
sip_hash,
) = xdis.main.disassemble_file(str(pyc_file),
outstream=open(os.devnull, "w"),
alternate_opmap=alternate_opmap)
output_file: TextIO
with new_file_name.open(mode="w") as output_file:
uncompyle6.main.decompile(
version,
co,
timestamp=timestamp,
source_size=source_size,
magic_int=magic_int,
is_pypy=is_pypy,
out=output_file,
)
except Exception as e:
e: Exception
logger.info(
f"[!] Failed to decompile file {pyc_file} with error: {e}")
return "error"
else:
logger.info(f"[+] Successfully decompiled {pyc_file}")
return "success"
def run(_args: List[str] = None) -> None:
"""Orchestrate the flow of the remap command.
This is the entry-point of the remap command. It calls out to other routines
and attempts to follow this high-level flow:
1. Check that program is running in sufficiently new Python
environment, and parse any arguments
2. Determine what type of input was passed to program, which will
ultimately decide what method remap uses to recover the opmap.
3. Attempt one of the opmap recovery methods (see documentation for
more on these methods)
4. If the opmap was successfully recovered, validate it, then write
it to a file.
Parameters
----------
_args : List[str]
If this function is being called from other Python code, remap
flags and other command-line options can be passed in as a list.
"""
if sys.version_info < (3, 8):
logger.critical(
"[!] This tool can only be run in Python 3.8 or later.")
sys.exit(1)
utils.check_for_our_xdis()
args: argparse.Namespace = _parse_args(_args)
logging_options: Dict[str, Union[bool, os.PathLike]] = {
"verbose": args.verbose,
"quiet": args.quiet
}
pydecipher.set_logging_options(**logging_options)
remapped_bytecode_path: pathlib.Path = pathlib.Path(
args.remapped_bytecode_path).resolve()
if args.output:
output_dir: pathlib.Path = pathlib.Path(args.output.strip()).resolve()
else:
output_dir: pathlib.Path = pathlib.Path.cwd()
output_dir = output_dir / f"remap_output_{utils.slugify(remapped_bytecode_path.name)}"
# The following block sets up logging to a stringIO stream, which will
# eventually be placed in a file. We don't immediately log to a file because
# we don't want to leave a log file on disk unless the program succeeds.
log_stream: io.StringIO = io.StringIO()
log_stream__handler: logging.StreamHandler = logging.StreamHandler(
log_stream)
log_stream__handler.setFormatter(pydecipher.log_format)
log_stream__handler.setLevel(logging.DEBUG)
logger.addHandler(log_stream__handler)
remappings: Dict[int, Dict[int, int]] = {}
version: str = ""
remapping_method: str = ""
cli: str = " ".join(sys.argv) if not _args else " ".join(_args)
if args.version:
version = args.version
if args.megafile:
# Determine if argument is a version or a path
if pathlib.Path(args.megafile).exists():
standard_bytecode_path: pathlib.Path = pathlib.Path(args.megafile)
else:
potential_version: str = args.megafile
magic_num: int = bytecode.version_str_to_magic_num_int(
potential_version)
if magic_num:
compiled_file: str
for compiled_file in os.listdir(
pathlib.Path(__file__).parent / "reference_files" /
"compiled"):
full_path_obj: pathlib.Path = (
pathlib.Path(__file__).parent / "reference_files" /
"compiled" / compiled_file)
infile: BinaryIO
with full_path_obj.open("rb") as infile:
if xdis.magics.magic2int(infile.read(4)) == magic_num:
logger.info(
f"[*] Found matching megafile for version {potential_version}"
)
standard_bytecode_path: pathlib.Path = full_path_obj
break
if not standard_bytecode_path:
logger.error(
"[!] Something went wrong. remap could not find a standard compiled version of this megafile."
) # Next, find the path of the reference file
sys.exit(1)
remappings, version = megafile_remap(standard_bytecode_path,
remapped_bytecode_path)
remapping_method = "Megafile"
elif args.opcode_file:
remappings, version = opcode_constants_remap(remapped_bytecode_path,
provided_version=version)
remapping_method = "opcode.pyc constants-walking"
elif args.standard_bytecode_path:
standard_bytecode_path: pathlib.Path = pathlib.Path(
args.standard_bytecode_path).resolve()
utils.check_read_access(standard_bytecode_path)
utils.check_read_access(remapped_bytecode_path)
utils.check_write_access(output_dir)
if not remapped_bytecode_path.is_dir():
raise ValueError(
"The standard/default remapping method requires a directory containing Python bytecode files"
)
if not standard_bytecode_path.is_dir():
raise ValueError(
"If you are going to provide your own reference opcode set, it must be a directory of "
"Python bytecode files")
remappings, version = standard_pyc_remap(standard_bytecode_path,
remapped_bytecode_path,
version=version)
remapping_method = "Diff'ing against standard library bytecode"
elif args.check_remapping:
# Here, remapped_bytecode_path is not actually bytecode, its a remapping
# file.
utils.check_read_access(remapped_bytecode_path)
remapping_file: TextIO
with remapped_bytecode_path.open() as remapping_file:
try:
remapping_json: Dict["str", Union[str, int]] = json.loads(
remapping_file.read())
except json.decoder.JSONDecodeError as e:
e: json.decoder.JSONDecodeError
logger.error(f"Could not read remapping file with error: {e}")
sys.exit(1)
version = remapping_json["python_version"]
remappings_list: Dict[str, Union[
bool, str, int]] = remapping_json["remapped_opcodes"]
remapping_dict: Dict[str, int] = {
d["opname"]: d["remapped_value"]
for d in remappings_list
}
if bytecode.validate_opmap(version, remapping_dict):
logger.info("[*] This opmap is valid.")
return
else:
msg: str = "This opmap is not valid."
if not logging_options["verbose"]:
msg += " Run with --verbose flag for more information."
logger.warning(f"[!] {msg}")
sys.exit(1)
if remappings:
remappings: Dict[int, int] = fix_remapping_conflicts(remappings)
remappings: Dict[int,
Tuple[int,
bool]] = fill_opmap_gaps(remappings, version)
output_file_path: pathlib.Path = write_remapping_file(
remappings, version, remapping_method, cli, output_dir=output_dir)
logger.info(
f"[*] Remapping file {output_file_path.name} written to {output_file_path.parent}."
)
# If we successfully produced the remapping file, we want to also
# include the logged output of remap.
log_name: str = datetime.datetime.now().strftime(
"log_%H_%M_%S_%b_%d_%Y.txt")
log_file_ptr: TextIO
with output_dir.joinpath(log_name).open("w") as log_file_ptr:
log_file_ptr.write(log_stream.getvalue())
logging_options: Dict[str, Union[bool, os.PathLike]] = {
"log_path": output_dir.joinpath(log_name)
}
pydecipher.set_logging_options(**logging_options)
else:
logger.warning(
"[!] Remap couldn't produce the new opmap. Run with --verbose for more information."
)
sys.exit(1)
def run(args_in: List[str] = None) -> None:
"""Orchestrate the flow of the pydecipher command.
This function is the entry-point of the pydecipher command. It calls out to
other routines and generally attempts to follow this high-level flow:
1. Parse program arguments.
2. Check that input files are readable and output locations are
writeable, including that the the program is running in a
sufficiently new Python environment (3.6+).
3. Recursively call unpack on the artifact until all items of
interest are extracted.
4. Decompile any Python bytecode found through the unpacking
process.
Parameters
----------
args_in : List[str]
If this function is being called from other Python code, pydecipher
flags and other command-line options can be passed in as a list.
"""
if sys.version_info < (3, 8):
logger.critical(
"[!] This tool can only be run in Python 3.8 or later.")
sys.exit(1)
utils.check_for_our_xdis()
args: argparse.Namespace = _parse_args(args_in)
logging_options: Dict[str, Union[bool, os.PathLike]] = {
"verbose": args.verbose,
"quiet": args.quiet
}
pydecipher.set_logging_options(**logging_options)
artifact_path: pathlib.Path = pathlib.Path(args.artifact_path).resolve()
utils.check_read_access(artifact_path)
relocate_pys: bool = False
pyc_files: Iterable[os.PathLike] = []
if args.output:
output_dir: pathlib.Path = pathlib.Path(args.output.strip()).resolve()
if artifact_path.is_dir():
relocate_pys = True
elif artifact_path.is_dir():
output_dir = artifact_path
relocate_pys = True
else:
output_dir: pathlib.Path = (
pathlib.Path.cwd() /
f"pydecipher_output_{utils.slugify(artifact_path.name.split('.')[0])}"
)
if artifact_path.is_file() and os.path.splitext(
artifact_path)[1].lower() in (".pyc", ".pyo"):
relocate_pys = True
pyc_files = [artifact_path]
# The following block sets up logging to a stringIO stream, which will
# eventually be placed in a file. We don't immediately log to a file
# because we don't want to leave a log file on disk unless the program
# succeeds, at least past the 'unpack' call.
log_stream: io.StringIO = io.StringIO()
log_stream__handler: logging.StreamHandler = logging.StreamHandler(
log_stream)
log_stream__handler.setFormatter(pydecipher.log_format)
log_stream__handler.setLevel(logging.DEBUG)
logger.addHandler(log_stream__handler)
version_hint: str = args.version_hint
alternate_opmap: Dict[str, int] = None
if args.remapping_file:
remap_file: pathlib.Path = pathlib.Path(args.remapping_file).resolve()
logger.info(f"[*] Using remap file {remap_file}")
utils.check_read_access(remap_file)
alternate_opmap: Dict[str, int] = bytecode.create_opmap_from_file(
remap_file)
with remap_file.open("r") as remapping_file:
file_json: str = json.loads(remapping_file.read())
remap_file_version: str = file_json["python_version"]
version_hint = remap_file_version
utils.check_write_access(output_dir)
# Dump all pyc files
if artifact_path.is_dir():
kwargs: Dict[str, str] = {"version_hint": version_hint}
dirpath: str
dirnames: List[str]
filenames: List[str]
for (dirpath, dirnames, filenames) in os.walk(artifact_path):
filename: str
for filename in filenames:
if os.path.splitext(filename)[1].lower() in (".pyc", ".pyo"):
full_path: pathlib.Path = pathlib.Path(dirpath).joinpath(
filename)
try:
pyc_class_obj: artifact_types.pyc.Pyc = artifact_types.pyc.Pyc(
full_path, output_dir=full_path.parent, **kwargs)
except TypeError:
pass
else:
pyc_class_obj.unpack()
pyc_files: List[pathlib.Path] = list(
artifact_path.rglob("*.[pP][yY][cCoO]"))
else:
unpack(artifact_path,
output_dir=str(output_dir),
version_hint=version_hint)
# If we produced files, we want to also include the logged output of
# pydecipher. If we didn't produce anything, we can assume the program
# failed/had uninteresting output that doesn't need to be kept. The one
# exception to this is when we pass in a single pyc file, or a directory of
# pyc files, to be decompiled.
if (output_dir.exists() and os.listdir(output_dir)) or pyc_files:
output_dir.mkdir(parents=True, exist_ok=True)
log_name: str = datetime.datetime.now().strftime(
"log_%H_%M_%S_%b_%d_%Y.txt")
with output_dir.joinpath(log_name).open("w") as log_file_ptr:
log_file_ptr.write(log_stream.getvalue())
logging_options: Dict[str, pathlib.Path] = {
"log_path": output_dir.joinpath(log_name)
}
pydecipher.set_logging_options(**logging_options)
else:
logger.warning("[!] This artifact produced no additional output.")
return
# Determine which pyc files to decompile
if not pyc_files:
pyc_files: Generator[os.PathLike, None,
None] = output_dir.rglob("*.[pP][yY][cCoO]")
if not args.decompile_all:
max_depth: int = 10
# Search output directory with increasing recursive depth to find
# first level of directories with .pyc files
depth: int
for depth in range(max_depth):
tmp: List[os.PathLike] = list(
pydecipher.utils.rglob_limit_depth(output_dir,
"*.[pP][yY][cCoO]",
depth))
if tmp:
pyc_files = tmp
break
# Dispatch a pool of processes to decompile the specified group of pyc files
bytecode.process_pycs(pyc_files, alternate_opmap=alternate_opmap)
# If any decompiled python needs to be moved to the output directory, do
# that now. This will only happen if the user passed in a pyc artifact
# (single file or dir). We decompile the .pyc file into a .py file alongside
# the .pyc file on disk, then move it to the designated output directory.
if artifact_path.is_file():
relative_root: pathlib.Path = artifact_path.parent
else:
relative_root: pathlib.Path = artifact_path
if relocate_pys:
pyc_file: pathlib.Path
for pyc_file in pyc_files:
py_file: pathlib.Path = pathlib.Path(str(pyc_file)[:-1])
if not py_file.exists():
continue
rel_path: pathlib.Path = py_file.relative_to(relative_root)
new_filepath: pathlib.Path = output_dir.joinpath(rel_path)
py_file.rename(new_filepath)
# Perform any cleanup functions on output of decompilation
pydecipher.artifact_types.py2exe.PYTHONSCRIPT.cleanup(output_dir)