PyCIRCLean is the core Python code used by CIRCLean, an open-source USB key and document sanitizer created by CIRCL. This module has been separated from the device-specific scripts and can be used for dedicated security applications to sanitize documents from hostile environments to trusted environments. PyCIRCLean is currently Python 3.3+ only.
python setup.py install
OR
pip install .
PyCIRCLean is a simple Python library to handle file checking and sanitization. PyCIRCLean is designed as a simple library that can be overloaded to cover specific checking and sanitization workflows in different organizations like industrial environments or restricted/classified ICT environments. A series of practical examples utilizing PyCIRCLean can be found in the ./examples directory.
The following simple example using PyCIRCLean will only copy files with a .conf extension matching the 'text/plain' MIME type. If any other file is found in the source directory, the files won't be copied to the destination directory.
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import os
import magic
from kittengroomer import FileBase, KittenGroomerBase, main
# Extension
configfiles = {'.conf': 'text/plain'}
class FileSpec(FileBase):
def __init__(self, src_path, dst_path):
''' Init file object, set the extension '''
super(FileSpec, self).__init__(src_path, dst_path)
a, self.extension = os.path.splitext(self.src_path)
self.mimetype = magic.from_file(self.src_path, mime=True).decode("utf-8")
class KittenGroomerSpec(KittenGroomerBase):
def __init__(self, root_src=None, root_dst=None):
'''
Initialize the basics of the copy
'''
if root_src is None:
root_src = os.path.join(os.sep, 'media', 'src')
if root_dst is None:
root_dst = os.path.join(os.sep, 'media', 'dst')
super(KittenGroomerSpec, self).__init__(root_src, root_dst)
self.valid_files = {}
# The initial version will only accept the file extensions/mimetypes listed here.
self.valid_files.update(configfiles)
def _print_log(self):
'''
Print the logs related to the current file being processed
'''
tmp_log = self.log_name.fields(**self.cur_file.log_details)
if not self.cur_file.log_details.get('valid'):
tmp_log.warning(self.cur_file.log_string)
else:
tmp_log.debug(self.cur_file.log_string)
def processdir(self):
'''
Main function doing the processing
'''
to_copy = []
error = []
for srcpath in self._list_all_files(self.src_root_dir):
valid = True
self.log_name.info('Processing {}', srcpath.replace(self.src_root_dir + '/', ''))
self.cur_file = FileSpec(srcpath, srcpath.replace(self.src_root_dir, self.dst_root_dir))
expected_mime = self.valid_files.get(self.cur_file.extension)
if expected_mime is None:
# Unexpected extension => disallowed
valid = False
compare_ext = 'Extension: {} - Expected: {}'.format(self.cur_file.extension, ', '.join(self.valid_files.keys()))
elif self.cur_file.mimetype != expected_mime:
# Unexpected mimetype => disallowed
valid = False
compare_mime = 'Mime: {} - Expected: {}'.format(self.cur_file.mimetype, expected_mime)
self.cur_file.add_log_details('valid', valid)
if valid:
to_copy.append(self.cur_file)
self.cur_file.log_string = 'Extension: {} - MimeType: {}'.format(self.cur_file.extension, self.cur_file.mimetype)
else:
error.append(self.cur_file)
if compare_ext is not None:
self.cur_file.log_string = compare_ext
else:
self.cur_file.log_string = compare_mime
if len(error) > 0:
for f in error + to_copy:
self.cur_file = f
self._print_log()
else:
for f in to_copy:
self.cur_file = f
self._safe_copy()
self._print_log()
if __name__ == '__main__':
main(KittenGroomerSpec, ' Only copy some files, returns an error is anything else is found')
exit(0)We welcome contributions (including bug fixes, new code workflows) via pull requests. We are interested in any new workflows that can be used to improve security in different organizations. If you see any potential enhancements required to support your sanitization workflow, please feel free to open an issue. Read CONTRIBUTING.md for more information.
Copyright (C) 2013-2015 Raphaël Vinot
Copyright (C) 2013-2015 CIRCL - Computer Incident Response Center Luxembourg (℅ smile gie)
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the organization nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
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