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120 lines
4.7 KiB
Python
120 lines
4.7 KiB
Python
# Mobile Verification Toolkit (MVT)
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# Copyright (c) 2021 The MVT Project Authors.
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# Use of this software is governed by the MVT License 1.1 that can be found at
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# https://license.mvt.re/1.1/
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import datetime
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import logging
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import stat
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from mvt.common.utils import convert_timestamp_to_iso
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from .base import AndroidExtraction
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log = logging.getLogger(__name__)
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class Files(AndroidExtraction):
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"""This module extracts the list of files on the device."""
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def __init__(self, file_path=None, base_folder=None, output_folder=None,
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serial=None, fast_mode=False, log=None, results=[]):
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super().__init__(file_path=file_path, base_folder=base_folder,
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output_folder=output_folder, fast_mode=fast_mode,
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log=log, results=results)
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self.full_find = None
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def find_path(self, file_path):
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"""Checks if Android system supports full find command output"""
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# Check find command params on first run
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# Run find command with correct args and parse results.
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# Check that full file printf options are suppported on first run.
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if self.full_find is None:
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output = self._adb_command("find '/' -maxdepth 1 -printf '%T@ %m %s %u %g %p\n' 2> /dev/null")
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if not (output or output.strip().splitlines()):
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# Full find command failed to generate output, fallback to basic file arguments
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self.full_find = False
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else:
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self.full_find = True
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found_files = []
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if self.full_find is True:
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# Run full file command and collect additonal file information.
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output = self._adb_command(f"find '{file_path}' -printf '%T@ %m %s %u %g %p\n' 2> /dev/null")
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for file_line in output.splitlines():
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[unix_timestamp, mode, size, owner, group, full_path] = file_line.rstrip().split(" ", 5)
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mod_time = convert_timestamp_to_iso(datetime.datetime.utcfromtimestamp(int(float(unix_timestamp))))
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found_files.append({
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"path": full_path,
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"modified_time": mod_time,
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"mode": mode,
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"is_suid": (int(mode, 8) & stat.S_ISUID) == 2048,
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"is_sgid": (int(mode, 8) & stat.S_ISGID) == 1024,
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"size": size,
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"owner": owner,
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"group": group,
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})
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else:
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# Run a basic listing of file paths.
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output = self._adb_command(f"find '{file_path}' 2> /dev/null")
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for file_line in output.splitlines():
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found_files.append({
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"path": file_line.rstrip()
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})
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return found_files
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def serialize(self, record):
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if "modified_time" in record:
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return {
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"timestamp": record["modified_time"],
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"module": self.__class__.__name__,
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"event": "file_modified",
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"data": record["path"],
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}
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def check_suspicious(self):
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"""Check for files with suspicious permissions"""
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for result in sorted(self.results, key=lambda item: item["path"]):
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if result.get("is_suid"):
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self.log.warning("Found an SUID file in a non-standard directory \"%s\".",
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result["path"])
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self.detected.append(result)
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def check_indicators(self):
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"""Check file list for known suspicious files or suspicious properties"""
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self.check_suspicious()
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if not self.indicators:
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return
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for result in self.results:
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if self.indicators.check_file_path(result["path"]):
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self.log.warning("Found a known suspicous file at path: \"%s\"", result["path"])
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self.detected.append(result)
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def run(self):
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self._adb_connect()
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found_file_paths = []
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DATA_PATHS = ["/data/local/tmp/", "/sdcard/", "/tmp/"]
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for path in DATA_PATHS:
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file_info = self.find_path(path)
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found_file_paths.extend(file_info)
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# Store results
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self.results.extend(found_file_paths)
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self.log.info("Found %s files in primary Android data directories.", len(found_file_paths))
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if self.fast_mode:
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self.log.info("Flag --fast was enabled: skipping full file listing")
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else:
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self.log.info("Flag --fast was not enabled: processing full file listing. "
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"This may take a while...")
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output = self.find_path("/")
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if output and self.output_folder:
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self.results.extend(output)
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log.info("List of visible files stored in files.json")
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self._adb_disconnect()
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