from __future__ import print_function import argparse import csv from datetime import datetime import os import pytsk3 import pyewf import sys """ MIT License Copyright (c) 2017 Chapin Bryce, Preston Miller Please share comments and questions at: https://github.com/PythonForensics/PythonForensicsCookbook or email pyforcookbook@gmail.com Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. """ __authors__ = ["Chapin Bryce", "Preston Miller"] __date__ = 20170815 __description__ = "Utility to iterate over files in an evidence containers" def main(image, img_type, output, part_type): volume = None print("[+] Opening {}".format(image)) if img_type == "ewf": try: filenames = pyewf.glob(image) except IOError: _, e, _ = sys.exc_info() print("[-] Invalid EWF format:\n {}".format(e)) sys.exit(2) ewf_handle = pyewf.handle() ewf_handle.open(filenames) # Open PYTSK3 handle on EWF Image img_info = EWFImgInfo(ewf_handle) else: img_info = pytsk3.Img_Info(image) try: if part_type is not None: attr_id = getattr(pytsk3, "TSK_VS_TYPE_" + part_type) volume = pytsk3.Volume_Info(img_info, attr_id) else: volume = pytsk3.Volume_Info(img_info) except IOError: _, e, _ = sys.exc_info() print("[-] Unable to read partition table:\n {}".format(e)) open_fs(volume, img_info, output) def open_fs(vol, img, output): print("[+] Recursing through files..") recursed_data = [] # Open FS and Recurse if vol is not None: for part in vol: if part.len > 2048 and "Unallocated" not in part.desc and \ "Extended" not in part.desc and \ "Primary Table" not in part.desc: try: fs = pytsk3.FS_Info( img, offset=part.start * vol.info.block_size) except IOError: _, e, _ = sys.exc_info() print("[-] Unable to open FS:\n {}".format(e)) root = fs.open_dir(path="/") data = recurse_files(part.addr, fs, root, [], [], [""]) recursed_data.append(data) else: try: fs = pytsk3.FS_Info(img) except IOError: _, e, _ = sys.exc_info() print("[-] Unable to open FS:\n {}".format(e)) root = fs.open_dir(path="/") data = recurse_files(1, fs, root, [], [], [""]) recursed_data.append(data) write_csv(recursed_data, output) def recurse_files(part, fs, root_dir, dirs, data, parent): dirs.append(root_dir.info.fs_file.meta.addr) for fs_object in root_dir: # Skip ".", ".." or directory entries without a name. if not hasattr(fs_object, "info") or \ not hasattr(fs_object.info, "name") or \ not hasattr(fs_object.info.name, "name") or \ fs_object.info.name.name in [".", ".."]: continue try: file_name = fs_object.info.name.name file_path = "{}/{}".format( "/".join(parent), fs_object.info.name.name) try: if fs_object.info.meta.type == pytsk3.TSK_FS_META_TYPE_DIR: f_type = "DIR" file_ext = "" else: f_type = "FILE" if "." in file_name: file_ext = file_name.rsplit(".")[-1].lower() else: file_ext = "" except AttributeError: continue size = fs_object.info.meta.size create = convert_time(fs_object.info.meta.crtime) change = convert_time(fs_object.info.meta.ctime) modify = convert_time(fs_object.info.meta.mtime) data.append(["PARTITION {}".format(part), file_name, file_ext, f_type, create, change, modify, size, file_path]) if f_type == "DIR": parent.append(fs_object.info.name.name) sub_directory = fs_object.as_directory() inode = fs_object.info.meta.addr # This ensures that we don't recurse into a directory # above the current level and thus avoid circular loops. if inode not in dirs: recurse_files(part, fs, sub_directory, dirs, data, parent) parent.pop(-1) except IOError: pass dirs.pop(-1) return data def write_csv(data, output): if data == []: print("[-] No output results to write") sys.exit(3) print("[+] Writing output to {}".format(output)) with open(output, "wb") as csvfile: csv_writer = csv.writer(csvfile) headers = ["Partition", "File", "File Ext", "File Type", "Create Date", "Modify Date", "Change Date", "Size", "File Path"] csv_writer.writerow(headers) for result_list in data: csv_writer.writerows(result_list) def convert_time(ts): if str(ts) == "0": return "" return datetime.utcfromtimestamp(ts) class EWFImgInfo(pytsk3.Img_Info): def __init__(self, ewf_handle): self._ewf_handle = ewf_handle super(EWFImgInfo, self).__init__(url="", type=pytsk3.TSK_IMG_TYPE_EXTERNAL) def close(self): self._ewf_handle.close() def read(self, offset, size): self._ewf_handle.seek(offset) return self._ewf_handle.read(size) def get_size(self): return self._ewf_handle.get_media_size() if __name__ == '__main__': parser = argparse.ArgumentParser( description=__description__, epilog="Developed by {} on {}".format( ", ".join(__authors__), __date__) ) parser.add_argument("EVIDENCE_FILE", help="Evidence file path") parser.add_argument("TYPE", help="Type of Evidence", choices=("raw", "ewf")) parser.add_argument("OUTPUT_CSV", help="Output CSV with lookup results") parser.add_argument("-p", help="Partition Type", choices=("DOS", "GPT", "MAC", "SUN")) args = parser.parse_args() directory = os.path.dirname(args.OUTPUT_CSV) if not os.path.exists(directory) and directory != "": os.makedirs(directory) if os.path.exists(args.EVIDENCE_FILE) and os.path.isfile(args.EVIDENCE_FILE): main(args.EVIDENCE_FILE, args.TYPE, args.OUTPUT_CSV, args.p) else: print("[-] Supplied input file {} does not exist or is not a " "file".format(args.EVIDENCE_FILE)) sys.exit(1)