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