mirror of https://github.com/CIRCL/PyCIRCLean
154 lines
6.6 KiB
Markdown
154 lines
6.6 KiB
Markdown
[](https://travis-ci.org/CIRCL/PyCIRCLean)
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[](https://codecov.io/github/CIRCL/PyCIRCLean?branch=master)
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[](https://coveralls.io/github/Rafiot/PyCIRCLean?branch=master)
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# PyCIRCLean
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PyCIRCLean is the Python code used by [CIRCLean](https://www.circl.lu/projects/CIRCLean/), the USB key and document sanitizer. The code
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has been separated from the devices as PyCIRCLean software can be used for dedicated security applications to sanitize documents
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from hostile environments to trusted environments.
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# Installation
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~~~
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python setup.py build
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python setup.py install
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~~~
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# How to use PyCIRCLean
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PyCIRCLean is a simple Python library to handle file checking and sanitization. PyCIRCLean purpose is to have a simple library that can be
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overloaded to cover specific checking and sanitization workflows in different organizations like industrial environment or restricted/classified ICT environment. A series of practical example are in the [./bin](./bin) directory.
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The following simple example using PyCIRCLean will only copy files with .conf extension matching the 'text/plain' MIME type. If any other file is found on the original USB key (source directory), the files won't be copied to the destination directory.
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~~~python
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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import os
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import magic
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from kittengroomer import FileBase, KittenGroomerBase, main
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# Extension
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configfiles = {'.conf': 'text/plain'}
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class FileSpec(FileBase):
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def __init__(self, src_path, dst_path):
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''' Init file object, set the extension '''
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super(FileSpec, self).__init__(src_path, dst_path)
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a, self.extension = os.path.splitext(self.src_path)
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self.mimetype = magic.from_file(self.src_path, mime=True).decode("utf-8")
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class KittenGroomerSpec(KittenGroomerBase):
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def __init__(self, root_src=None, root_dst=None):
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'''
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Initialize the basics of the copy
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'''
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if root_src is None:
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root_src = os.path.join(os.sep, 'media', 'src')
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if root_dst is None:
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root_dst = os.path.join(os.sep, 'media', 'dst')
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super(KittenGroomerSpec, self).__init__(root_src, root_dst)
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self.valid_files = {}
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# The initial version will only accept the file extensions/mimetypes listed here.
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self.valid_files.update(configfiles)
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def _print_log(self):
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'''
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Print the logs related to the current file being processed
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'''
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tmp_log = self.log_name.fields(**self.cur_file.log_details)
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if not self.cur_file.log_details.get('valid'):
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tmp_log.warning(self.cur_file.log_string)
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else:
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tmp_log.debug(self.cur_file.log_string)
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def processdir(self):
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'''
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Main function doing the processing
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'''
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to_copy = []
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error = []
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for srcpath in self._list_all_files(self.src_root_dir):
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valid = True
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self.log_name.info('Processing {}', srcpath.replace(self.src_root_dir + '/', ''))
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self.cur_file = FileSpec(srcpath, srcpath.replace(self.src_root_dir, self.dst_root_dir))
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expected_mime = self.valid_files.get(self.cur_file.extension)
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if expected_mime is None:
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# Unexpected extension => disallowed
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valid = False
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compare_ext = 'Extension: {} - Expected: {}'.format(self.cur_file.extension, ', '.join(self.valid_files.keys()))
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elif self.cur_file.mimetype != expected_mime:
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# Unexpected mimetype => dissalowed
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valid = False
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compare_mime = 'Mime: {} - Expected: {}'.format(self.cur_file.mimetype, expected_mime)
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self.cur_file.add_log_details('valid', valid)
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if valid:
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to_copy.append(self.cur_file)
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self.cur_file.log_string = 'Extension: {} - MimeType: {}'.format(self.cur_file.extension, self.cur_file.mimetype)
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else:
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error.append(self.cur_file)
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if compare_ext is not None:
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self.cur_file.log_string = compare_ext
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else:
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self.cur_file.log_string = compare_mime
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if len(error) > 0:
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for f in error + to_copy:
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self.cur_file = f
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self._print_log()
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else:
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for f in to_copy:
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self.cur_file = f
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self._safe_copy()
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self._print_log()
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if __name__ == '__main__':
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main(KittenGroomerSpec, ' Only copy some files, returns an error is anything else is found')
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exit(0)
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~~~
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# How to contribute
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We welcome contributions (including bug fixes, new code workflows) via pull requests. We are interested in any new workflows
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that can be used to improve security in different organizations. If you see any potential enhancement required to support
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your sanitization workflow, feel free to open an issue.
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# License
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~~~
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Copyright (C) 2013-2015 Raphaël Vinot
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Copyright (C) 2013-2015 CIRCL - Computer Incident Response Center Luxembourg (℅ smile gie)
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the organization nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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~~~
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