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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>
"""
from collections import defaultdict
from logging import getLogger
from typing import List
from defence360agent.contracts.config import Malware as Config
from defence360agent.contracts.license import LicenseError
from defence360agent.contracts.messages import MessageType
from defence360agent.contracts.plugins import (
MessageSink,
MessageSource,
expect,
)
from imav.malwarelib.model import MalwareHit
from imav.malwarelib.utils import malware_response
from imav.malwarelib.utils.malware_response import (
ClientError,
FileTooLargeError,
)
from defence360agent.utils import get_results_iterable_expression
logger = getLogger(__name__)
class MalwareResponsePlugin(MessageSink, MessageSource):
async def create_source(self, loop, sink):
self._loop = loop
self._sink = sink
async def create_sink(self, loop):
self._loop = loop
@expect(MessageType.MalwareResponse)
async def process_message_malware_response(self, message):
hashes = self._collect_hashes(message.files)
unknown_hashes = hashes[MessageType.MalwareResponse.UNKNOWN.lower()]
if unknown_hashes:
await self._process_unknown_hash(unknown_hashes)
async def _process_unknown_hash(self, hashes: set):
"""
If there is no such file with given hash in database, Imunify360 Client
should upload file using API endpoint /api/v1/upload.
"""
if not Config.SEND_FILES:
logger.info("Sending unknown files to MRS is disabled.")
return
orig_files = self._get_orig_files(hashes)
for orig_file in orig_files:
logger.info("Unknown file %s. Uploading to MRS.", orig_file)
try:
await malware_response.upload_with_retries(orig_file)
except LicenseError as e:
logger.warning(
"Cannot upload the following files to MRS %r: %s",
orig_files,
e,
)
break
except ClientError as e:
logger.error("File %s uploading failed. %s.", orig_file, e)
except FileNotFoundError:
logger.warning(
"File %s not found, skipping upload.", orig_file
)
except FileTooLargeError as e:
logger.warning("File %s uploading failed. %s.", orig_file, e)
@staticmethod
def _collect_hashes(files):
type_to_hash = defaultdict(set)
for file_hash, hash_type in files.items():
type_to_hash[hash_type.lower()].add(file_hash)
return type_to_hash
@staticmethod
def _get_orig_files(hashes: set) -> List[str]:
result = []
def expression(hashes):
return MalwareHit.select().where(MalwareHit.hash.in_(hashes))
for hit in get_results_iterable_expression(expression, hashes):
try:
result.append(hit.orig_file)
except FileNotFoundError:
logger.warning("File %s not found, skipping.", hit.orig_file)
return result