From 0c80ae4f816281541e177017f9e2e1e518a78b3e Mon Sep 17 00:00:00 2001 From: Mike Auty Date: Wed, 2 Nov 2022 21:39:27 +0000 Subject: [PATCH 1/2] Automagic: Check file datetime to determine whether to recache --- .../framework/automagic/symbol_cache.py | 27 +++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-) diff --git a/volatility3/framework/automagic/symbol_cache.py b/volatility3/framework/automagic/symbol_cache.py index 30a4068b6..fe5dfac52 100644 --- a/volatility3/framework/automagic/symbol_cache.py +++ b/volatility3/framework/automagic/symbol_cache.py @@ -2,6 +2,7 @@ # which is available at https://www.volatilityfoundation.org/license/vsl-v1.0 # import base64 +import datetime import json import logging import os @@ -170,6 +171,7 @@ class SqliteCache(CacheManagerInterface): def _connect_storage(self, path: str) -> sqlite3.Connection: database = sqlite3.connect(path) database.row_factory = sqlite3.Row + database.cursor().execute( f'CREATE TABLE IF NOT EXISTS database_info (schema_version INT DEFAULT {constants.CACHE_SQLITE_SCHEMA_VERSION})') schema_version = database.cursor().execute('SELECT schema_version FROM database_info').fetchone() @@ -259,10 +261,31 @@ class SqliteCache(CacheManagerInterface): cache_update = set() files_to_timestamp = on_disk_locations.intersection(cached_locations) if files_to_timestamp: - result = self._database.cursor().execute("SELECT location FROM cache WHERE local = 1 " + result = self._database.cursor().execute("SELECT location, cached FROM cache WHERE local = 1 " f"AND cached < date('now', '{self.cache_period}');") for row in result: - if row['location'] in files_to_timestamp: + location = row['location'] + stored_timestamp = datetime.datetime.fromisoformat(row['cached']) + timestamp = stored_timestamp # Default to requiring update + + # See if the file is a local URL type we can handle: + parsed = urllib.parse.urlparse(location) + pathname = None + if parsed.scheme == 'file': + pathname = urllib.request.url2pathname(parsed.path) + if parsed.scheme == 'jar': + inner_url = urllib.parse.urlparse(parsed.path) + if inner_url.scheme == 'file': + pathname = inner_url.path.split('!')[0] + + if pathname: + timestamp = datetime.datetime.fromtimestamp(os.stat(pathname).st_mtime) + else: + vollog.log(constants.LOGLEVEL_VVVV, + "File location in database classed as local but not file/jar URL") + + # If we're supposed to include it, and our last check is older than (or equal to) the file timestamp + if row['location'] in files_to_timestamp and stored_timestamp < timestamp: cache_update.add(row['location']) idextractors = list(framework.class_subclasses(IdentifierProcessor)) From 5ac191b31008a1e678a77839cb2aed489310691a Mon Sep 17 00:00:00 2001 From: Mike Auty Date: Wed, 2 Nov 2022 21:43:18 +0000 Subject: [PATCH 2/2] Automagic: Set the cache period back to 3 days --- volatility3/framework/constants/__init__.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/volatility3/framework/constants/__init__.py b/volatility3/framework/constants/__init__.py index 4fd53a3eb..b19e80472 100644 --- a/volatility3/framework/constants/__init__.py +++ b/volatility3/framework/constants/__init__.py @@ -63,7 +63,7 @@ LOGLEVEL_VVVV = 6 CACHE_PATH = os.path.join(os.path.expanduser("~"), ".cache", "volatility3") """Default path to store cached data""" -SQLITE_CACHE_PERIOD = '-1 month' +SQLITE_CACHE_PERIOD = '-3 days' """SQLite time modifier for how long each item is valid in the cache for""" if sys.platform == 'win32':