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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 re
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.utils import malware_response
logger = getLogger(__name__)
class MRSUploader(MessageSink, MessageSource):
ERR_MSG = "Failed to submit a file"
SUSP_PATTERN = re.compile(r"(?:suspicious\..+|[CS]MW-SUS-.+|SMW-HEUR-ELF)")
async def create_source(self, loop, sink):
self._sink = sink
self._loop = loop
async def create_sink(self, loop):
pass
def _separate_hits_by_type(self, results) -> tuple:
malicious = []
suspicious = []
extended_suspicious = []
for file, data in results.items():
is_extended_suspicious = False
is_suspicious = False
is_malicious = False
for hit in data["hits"]:
is_extended_suspicious |= hit.get("extended_suspicious", False)
is_suspicious |= bool(
hit["suspicious"]
and self.SUSP_PATTERN.match(hit["matches"])
)
is_malicious |= not hit["suspicious"]
hit_info = malware_response.HitInfo(file, data["hash"])
if is_extended_suspicious:
extended_suspicious.append(hit_info)
elif is_suspicious:
suspicious.append(hit_info)
elif is_malicious:
malicious.append(hit_info)
return malicious, suspicious, extended_suspicious
@expect(MessageType.MalwareScan)
async def process_scan(self, message):
results = message["results"]
if results is None:
return
if not Config.SEND_FILES:
logger.info("Uploading files to MRS is disabled")
return
(
malicious_hits,
suspicious_hits,
extended_suspicious_hits,
) = self._separate_hits_by_type(results)
if malicious_hits:
await self._sink.process_message(
MessageType.MalwareMRSUpload(
hits=malicious_hits, upload_reason="malicious"
)
)
if suspicious_hits:
# Move uploading to another task
await self._sink.process_message(
MessageType.MalwareMRSUpload(
hits=suspicious_hits, upload_reason="suspicious"
)
)
if extended_suspicious_hits: # pragma: no cover
await self._sink.process_message(
MessageType.MalwareMRSUpload(
hits=extended_suspicious_hits,
upload_reason="extended-suspicious",
)
)
errors = message["summary"].get("errors")
if errors:
error_hits = [
malware_response.HitInfo(hit["file"], hit["hash"])
for hit in errors
]
await self._sink.process_message(
MessageType.MalwareMRSUpload(
hits=error_hits, upload_reason="scan_error"
)
)
@expect(MessageType.MalwareMRSUpload)
async def process_hits(self, message):
hits: List[malware_response.HitInfo] = message["hits"]
upload_reason = message.get("upload_reason", "suspicious")
unknown_hashes = await malware_response.check_known_hashes(
self._loop, (hit.hash for hit in hits), upload_reason
)
if not unknown_hashes:
logger.info("All files are known to MRS. Skipping uploading...")
return
files = (hit.file for hit in hits if hit.hash in unknown_hashes)
for file in files:
try:
await malware_response.upload_with_retries(
file,
upload_reason=upload_reason,
)
except LicenseError as e:
logger.warning("Cannot process message %s: %s", message, e)
break
except FileNotFoundError as e:
err = "{}. {}".format(self.ERR_MSG, e.strerror)
logger.warning("%s: %s", err, e.filename)