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Current File : /opt/imunify360/venv/lib64/python3.11/site-packages/imav/malwarelib/scan/ai_bolit/detached.py
"""
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 asyncio
import json
import logging
import shutil
import time
from dataclasses import dataclass
from pathlib import Path
from typing import List, Optional

import psutil

from imav.malwarelib.config import (
    ExitDetachedScanType,
    MalwareScanResourceType,
)
from imav.malwarelib.scan import ScanAlreadyCompleteError
from imav.malwarelib.scan.ai_bolit import AIBOLIT, AIBOLIT_PATH
from imav.malwarelib.scan.ai_bolit.report import (
    parse_report_csv,
    parse_report_json,
)
from imav.malwarelib.scan.detached import DetachedDir, DetachedScan
from imav.malwarelib.scan.utils import trim_file_content
from defence360agent.contracts.messages import MessageType
from defence360agent.utils import rmtree

logger = logging.getLogger(__name__)


AIBOLIT_PID_WAIT_TIME = 30


class AiBolitDetachedDir(DetachedDir):
    DETACHED_DIR = "/var/imunify360/aibolit/run"

    csv_report_path: Path
    json_report_path: Path
    listing_file: Path
    scan_info_file: Path

    FILES = {
        **DetachedDir.FILES,
        "csv_report_path": "report.csv",
        "json_report_path": "report.json",
        "listing_file": "file",
        "scan_info_file": "scan_info.json",
    }

    def __init__(self, detached_id, tmp_listing_file=None):
        """
        NOTE: Initialization should not create any files
        """
        super().__init__(detached_id)
        self.tmp_listing_file = tmp_listing_file

    def __enter__(self):
        super().__enter__()

        # Needed in case of internal finder
        if self.tmp_listing_file is not None:
            shutil.copyfile(self.tmp_listing_file.name, str(self.listing_file))

        return self


@dataclass
class FileScanInfo:
    cmd: List[str]
    scan_type: Optional[str]


class AiBolitDetachedScan(DetachedScan):
    RESOURCE_TYPE = MalwareScanResourceType.FILE
    DETACHED_DIR_CLS = AiBolitDetachedDir

    def _parse_report(self):
        """Parse json/csv ai-bolit report

        Parse whichever one exists. We can't use the use_json flag to
        decide which one should exist, because the flag could be changed
        after the report has been created.
        """
        if self.detached_dir.csv_report_path.is_file():
            return parse_report_csv(self.detached_dir.csv_report_path)

        with self.detached_dir.json_report_path.open() as fp:
            report = json.load(fp)
        return parse_report_json(report)

    def get_reported_summary(self):
        """Get scan performance metrics if present in the summary"""

        with self.detached_dir.json_report_path.open() as f:
            summary = json.load(f).get("summary", {})
        stats = {
            k: v
            for k, v in summary.items()
            if k
            in (
                "scan_time",
                "report_time",
                "finder_time",
                "cas_time",
                "deobfuscate_time",
                "scan_time_hs",
                "scan_time_preg",
                "smart_time_hs",
                "smart_time_preg",
                "mem_peak",
                "total_files",
                "cpu_user",
                "cpu_system",
                "rchar",
                "wchar",
                "syscr",
                "syscw",
                "read_bytes",
                "write_bytes",
                "cancelled_write_bytes",
                "decision_stats",
                "errors",
            )
        }
        if "ai_version" in summary:
            stats["aibolit_version"] = summary["ai_version"]
        if "db_version" in summary:
            stats["signatures_version"] = summary["db_version"]
        return stats

    def _get_progress_info(self):
        try:
            with self.detached_dir.progress_file.open() as fp:
                return json.load(fp)
        except (FileNotFoundError, json.JSONDecodeError):
            return {}

    def _is_scan_finished(self):
        return self.detached_dir.done_file.exists()

    @property
    def progress(self):
        try:
            return int(float(self._get_progress_info()["progress"]))
        except KeyError:
            return 100 if self._is_scan_finished() else 0

    @property
    def total_resources(self):
        try:
            return int(self._get_progress_info()["files_total"])
        except (KeyError, ValueError):
            return 0

    @property
    def phase(self):
        if self.progress == 0:
            return "preparing file list"

        return "{} scanning".format(AIBOLIT)

    def _load_scan_info(self) -> FileScanInfo:
        try:
            with self.detached_dir.scan_info_file.open() as fp:
                info = json.load(fp)
        except (FileNotFoundError, json.JSONDecodeError):
            info = {}
        return FileScanInfo(
            cmd=info.get("cmd", []), scan_type=info.get("scan_type")
        )

    async def complete(self) -> MessageType.MalwareScan:
        # TODO: test this method
        scan_info = self._load_scan_info()
        message = {
            "summary": {
                "args": scan_info.cmd,
                "scanid": self.detached_id,
                "type": scan_info.scan_type,
                "stderr": self.extract_stderr(),
                "stdout": self.extract_stdout(),
            }
        }

        try:
            reported_summary = self.get_reported_summary()
        except FileNotFoundError as e:
            raise ScanAlreadyCompleteError from e
        try:
            scan_data = self._parse_report()
        except FileNotFoundError as e:
            raise ScanAlreadyCompleteError from e
        except Exception as e:
            message["summary"]["error"] = str(e)
            message["results"] = []
            logger.exception("Unable to parse AI-BOLIT report")
        else:
            message["summary"].update(reported_summary)
            message["results"] = list(scan_data)

        return MessageType.MalwareScan(message)

    def extract_stdout(self) -> str:
        try:
            return self.detached_dir.log_file.read_text()
        except FileNotFoundError:
            return ""

    def extract_stderr(self) -> str:
        try:
            return self.detached_dir.err_file.read_text()
        except FileNotFoundError:
            return ""

    @classmethod
    def process_is_suitable(cls, proc) -> bool:
        if proc:
            return AIBOLIT_PATH in proc.cmdline()
        return False

    async def kill_running_scan_process(self, timer=time.monotonic):
        error = None
        deadline = timer() + AIBOLIT_PID_WAIT_TIME
        while timer() < deadline:
            try:
                pid = self.get_pid()
                break
            except (FileNotFoundError, ValueError) as err:
                await asyncio.sleep(1)
                error = err
        else:
            logger.warning(
                "Cannot find the aibolit process to kill (%s): %r."
                " Assuming it's already dead.",
                self.detached_id,
                error,
            )
            return
        try:
            proc = psutil.Process(pid)
            if self.process_is_suitable(proc):
                proc.kill()
        except psutil.Error as err:
            logger.warning(
                "Problem when killing the running aibolit process: %s", err
            )

    async def handle_aborted_process(
        self,
        *,
        sink,
        exit_type: str = ExitDetachedScanType.ABORTED,
        kill: bool = True,
        scan_path: Optional[str] = None,
        scan_type: Optional[str] = None,
        scan_started: Optional[float] = None,
    ) -> None:
        if kill:
            await self.kill_running_scan_process()
        scan_dir = self.detached_dir
        stdout = trim_file_content(scan_dir.log_file)
        stderr = trim_file_content(scan_dir.err_file)
        cmd = self._load_scan_info().cmd
        if scan_path is None and cmd:
            index = cmd.index("--path")
            scan_path = cmd[index + 1]

        logger.info("Scan %s was aborted", self.detached_id)
        scan_info = self._load_scan_info()
        scan_result = {
            "summary": {
                "scanid": self.detached_id,
                "total_files": 0,
                "total_malicious": 0,
                "completed": time.time(),
                "error": exit_type,
                "started": scan_started or 0.0,
                "type": scan_type or scan_info.scan_type,
                "path": scan_path,
                "stdout": stdout,
                "stderr": stderr,
                "args": cmd or scan_info.cmd,
            },
            "results": {},
        }
        await sink.process_message(MessageType.MalwareScan(**scan_result))
        if exit_type == ExitDetachedScanType.ABORTED:
            msg = MessageType.ScanFailed()
            msg["out"] = stdout
            msg["err"] = stderr
            logger.warning(
                "Scan was aborted: %s", msg["err"] + ", " + msg["out"]
            )
            msg["command"] = cmd
            msg["message"] = "aborted"
            msg["scan_id"] = self.detached_id
            msg["path"] = scan_path
            await sink.process_message(msg)
        if not scan_dir.path.is_dir():
            logger.warning("No such directory: %s", scan_dir)
        else:
            rmtree(str(scan_dir))

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