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"""
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Copyright © 2019 Cloud Linux Software Inc.
This software is also available under ImunifyAV commercial license,
see <https://www.imunify360.com/legal/eula>
"""
import os
from logging import getLogger
from defence360agent.contracts.config import Malware as Config
from defence360agent.contracts.messages import MessageType
from defence360agent.contracts.plugins import (
MessageSink,
MessageSource,
expect,
)
from imav.malwarelib.config import MalwareScanType
from imav.malwarelib.model import MalwareIgnorePath
from imav.malwarelib.plugins.detached_scan import DetachedScanPlugin
from imav.malwarelib.scan.scanner import MalwareScanner
from defence360agent.utils import recurring_check
logger = getLogger(__name__)
class Scanner(MessageSink, MessageSource):
_loop, _sink = None, None
_targets, _rescan_targets = None, None
_scan_task = None
async def create_source(self, loop, sink):
self._loop = loop
self._sink = sink
self._scan_task = self._loop.create_task(self._recurring_scan())
async def create_sink(self, loop):
self._targets, self._rescan_targets = set(), set()
async def shutdown(self):
self._scan_task.cancel()
await self._scan_task
def _process_scan_task(self, message):
for path in message["filelist"]:
if not isinstance(path, str):
t = type(path)
path = os.fsdecode(path)
logger.error(
"Received path %s as %s instead of %s. Message: %s",
path,
t,
type(str),
message,
)
scan_type = message.get("scan_type", MalwareScanType.REALTIME)
if scan_type == MalwareScanType.RESCAN:
self._rescan_targets.add(path)
else:
self._targets.add(path)
@expect(MessageType.MalwareScanTask)
async def process_scan_task(self, message):
self._process_scan_task(message)
@expect(MessageType.MalwareRescanFiles)
async def rescan_files(self, message):
filelist = message["files"]
msg = MessageType.MalwareScanTask(
filelist=filelist, scan_type="rescan"
)
self._process_scan_task(msg)
@staticmethod
async def _filter_out(targets):
result = list()
for filename in targets:
if os.path.exists(
filename
) and not await MalwareIgnorePath.is_path_ignored(filename):
result.append(filename)
return result
async def _scan_targets(self, targets, scan_type):
if targets:
logger.info(
"Checking files to scan with type={}".format(scan_type)
)
file_list = await self._filter_out(targets)
if not file_list:
return
logger.debug("Scanning files: %s", file_list)
scanner = MalwareScanner(sink=self._sink, hooks=True)
scanner.start(file_list, scan_type=scan_type)
result = await scanner.async_wait()
if scanner is not None:
message = await DetachedScanPlugin.aggregate_result(result)
await self._sink.process_message(
MessageType.MalwareScan(**message)
)
async def _scan(self):
# copy set to list to prevent race conditions
inotify_targets, self._targets = self._targets, set()
rescan_targets, self._rescan_targets = self._rescan_targets, set()
await self._scan_targets(inotify_targets, MalwareScanType.REALTIME)
await self._scan_targets(rescan_targets, MalwareScanType.RESCAN)
@recurring_check(Config.INOTIFY_SCAN_PERIOD)
async def _recurring_scan(self):
await self._scan()