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https://github.com/PacktPublishing/Python-Digital-Forensics-Cookbook.git
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312 lines
12 KiB
Python
312 lines
12 KiB
Python
from __future__ import print_function
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import os
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import pytsk3
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import sys
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import pyewf
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from datetime import datetime
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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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class EWFImgInfo(pytsk3.Img_Info):
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"""EWF Image Format helper class"""
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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="", 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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class TSKUtil(object):
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def __init__(self, evidence, image_type):
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self.evidence = evidence
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self.image_type = image_type
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# Assigned parameters
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self.vol = None
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self.image_handle = None
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self.fs = []
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# Prep volume and fs objects
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self.run()
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def run(self):
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self.open_vol()
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self.open_FS()
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def return_vol(self):
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sys.stderr.write("[+] Opening {}\n".format(self.evidence))
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# Handle EWF/Raw Images
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if self.image_type == "ewf":
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try:
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filenames = pyewf.glob(self.evidence)
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except IOError:
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_, e, _ = sys.exc_info()
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sys.stderr.write("[-] Invalid EWF format:\n {}\n".format(e))
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raise IOError
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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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self.image_handle = EWFImgInfo(ewf_handle)
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else:
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self.image_handle = pytsk3.Img_Info(self.evidence)
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# Open volume from image
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try:
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self.vol = pytsk3.Volume_Info(self.image_handle)
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except IOError:
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return None
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return self.vol
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def open_vol(self):
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sys.stderr.write("[+] Opening {}\n".format(self.evidence))
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# Handle EWF/Raw Images
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if self.image_type == "ewf":
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try:
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filenames = pyewf.glob(self.evidence)
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except IOError:
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_, e, _ = sys.exc_info()
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sys.stderr.write("[-] Invalid EWF format:\n {}\n".format(e))
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raise IOError
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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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self.image_handle = EWFImgInfo(ewf_handle)
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else:
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self.image_handle = pytsk3.Img_Info(self.evidence)
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# Open volume from image
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try:
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self.vol = pytsk3.Volume_Info(self.image_handle)
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except IOError:
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_, e, _ = sys.exc_info()
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sys.stderr.write("[-] Unable to read partition table. Possible logical image:\n {}\n".format(e))
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def open_FS(self):
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# Open FS and Recurse
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if self.vol is not None:
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for partition in self.vol:
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if partition.len > 2048 and "Unallocated" not in partition.desc and "Extended" not in partition.desc and "Primary Table" not in partition.desc:
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try:
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self.fs.append(pytsk3.FS_Info(
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self.image_handle,
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offset=partition.start * self.vol.info.block_size))
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except IOError:
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_, e, _ = sys.exc_info()
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sys.stderr.write("[-] Unable to open FS:\n {}\n".format(e))
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else:
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try:
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self.fs.append(pytsk3.FS_Info(self.image_handle))
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except IOError:
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_, e, _ = sys.exc_info()
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sys.stderr.write("[-] Unable to open FS:\n {}\n".format(e))
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def detect_ntfs(self, vol, partition):
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try:
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block_size = vol.info.block_size
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fs_object = pytsk3.FS_Info(self.image_handle, offset=(partition.start * block_size))
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except Exception:
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sys.stderr.write("[-] Unable to open FS\n")
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return False
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if fs_object.info.ftype == pytsk3.TSK_FS_TYPE_NTFS_DETECT:
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return True
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else:
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return False
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def recurse_files(self, substring, path="/", logic="contains", case=False):
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files = []
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for i, fs in enumerate(self.fs):
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try:
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root_dir = fs.open_dir(path)
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except IOError:
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continue
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files += self.recurse_dirs(i, fs, root_dir, [], [], [""], substring, logic, case)
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if files == []:
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return None
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else:
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return files
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def query_directory(self, path):
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dirs = []
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for i, fs in enumerate(self.fs):
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try:
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dirs.append((i, fs.open_dir(path)))
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except IOError:
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continue
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if dirs == []:
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return None
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else:
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return dirs
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def recurse_dirs(self, part, fs, root_dir, dirs, data, parent, substring, logic, case):
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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 not hasattr(fs_object.info, "name") or not hasattr(fs_object.info.name, "name") or 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("/".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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except AttributeError:
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continue # Which object has the AttributeError?
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if f_type == "FILE":
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if logic.lower() == 'contains':
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if case is False:
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if substring.lower() in file_name.lower():
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data.append((file_name, file_path, fs_object, part))
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else:
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if substring in file_name:
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data.append((file_name, file_path, fs_object, part))
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elif logic.lower() == 'startswith':
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if case is False:
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if file_name.lower().startswith(substring.lower()):
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data.append((file_name, file_path, fs_object, part))
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else:
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if file_name.startswith(substring):
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data.append((file_name, file_path, fs_object, part))
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elif logic.lower() == 'endswith':
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if case is False:
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if file_name.lower().endswith(substring.lower()):
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data.append((file_name, file_path, fs_object, part))
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else:
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if file_name.endswith(substring):
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data.append((file_name, file_path, fs_object, part))
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elif logic.lower() == 'equal':
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if case is False:
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if substring.lower() == file_name.lower():
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data.append((file_name, file_path, fs_object, part))
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else:
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if substring == file_name:
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data.append((file_name, file_path, fs_object, part))
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else:
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sys.stderr.write("[-] Warning invalid logic {} provided\n".format(logic))
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sys.exit()
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elif 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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self.recurse_dirs(part, fs, sub_directory, dirs, data, parent, substring, logic, case)
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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 openVSSFS(img, count):
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# Open FS and Recurse
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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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sys.stderr.write("[-] Unable to open FS: {}".format(e))
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root = fs.open_dir(path="/")
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data = recurseFiles(count, fs, root, [], [], [""])
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return data
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def recurseFiles(count, 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 not hasattr(fs_object.info, "name") or not hasattr(fs_object.info.name, "name") or 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("/".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 = convertTime(fs_object.info.meta.crtime)
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change = convertTime(fs_object.info.meta.ctime)
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modify = convertTime(fs_object.info.meta.mtime)
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data.append(["VSS {}".format(count), file_name, file_ext, 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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recurseFiles(count, fs, sub_directory, dirs, data, 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 convertTime(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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