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Current File : /opt/imunify360/venv/lib/python3.11/site-packages/defence360agent/contracts/plugins.py
import asyncio
import inspect
import logging
import subprocess
from abc import ABC, ABCMeta, abstractmethod
from contextlib import suppress
from functools import lru_cache, wraps

from defence360agent.contracts.messages import Message, MessageType
from defence360agent.utils import Scope

logger = logging.getLogger(__name__)


class BasePlugin(object):
    SCOPE = Scope.AV_IM360
    SHUTDOWN_PRIORITY = 100  # lower means shuts down first
    AVAILABLE_ON_FREEMIUM = True
    _subclasses = []

    def __init_subclass__(cls, **kwargs):
        super().__init_subclass__(**kwargs)
        cls._subclasses.append(cls)

    @classmethod
    def get_active_plugins(cls):
        # consider all non-abstract subclasses are active
        return [
            plugin
            for plugin in cls._subclasses
            if not inspect.isabstract(plugin)
        ]

    async def shutdown(self):
        """Shutdown plugin's subsystems, cancel running tasks,
        clean iptables (if plugin is protector).

        It should be safe to assume that it is called after
        corresponding create_source if applicable.

        It is called only from the shutdown task that runs at most once,
        meaning shutdown() is never called twice.

        """
        pass

    def __repr__(self):
        return "%s.%s" % (self.__class__.__module__, self.__class__.__name__)


class MessageSource(BasePlugin, ABC):
    @abstractmethod
    def create_source(self, loop, sink):
        """This method is a coroutine."""


class Sensor(MessageSource, ABC):
    """
    Sensor is alias to MessageSource.
    """

    def create_source(self, loop, sink):
        """This method is a coroutine."""
        return self.create_sensor(loop, sink)

    @abstractmethod
    def create_sensor(self, loop, sink):
        """This method is a coroutine."""


class LogStreamReader(Sensor, metaclass=ABCMeta):
    source_file = None

    # Limit of bytes consumed from stream
    # while trying to read one line (128 kB)
    _LIMIT = 2**17
    _cmd = None

    async def create_sensor(self, loop, sink):
        self._loop = loop
        self._sink = sink
        self._cmd = None

        if not self.source_file:
            return

        self._cmd = (
            "/usr/bin/tail",
            # follow beyond the end of the file
            "--follow=name",
            "-n0",
            # keep trying to open a file if it is inaccessible
            "--retry",
            self.source_file,
        )

        self._child_process = await asyncio.create_subprocess_exec(
            *self._cmd,
            stdin=subprocess.DEVNULL,
            stdout=subprocess.PIPE,
            stderr=subprocess.DEVNULL,
            bufsize=0,
            limit=self._LIMIT
        )

        loop.create_task(
            self._infinite_read_and_proceed(self._child_process.stdout)
        )

    async def shutdown(self):
        if self._cmd is not None:
            cmd, self._cmd = self._cmd, None
            logger.debug("Terminating child process [%s]", cmd)

            # child process dies from the same signal when agent
            # is run from console (not as --daemon)
            with suppress(ProcessLookupError):
                self._child_process.kill()

            rc = await self._child_process.wait()
            logger.debug(
                "Terminated child process [%s] with code [%d]", cmd, rc
            )

    @abstractmethod
    async def _infinite_read_and_proceed(self, stream_reader):
        raise NotImplementedError


class BaseMessageProcessor:
    @lru_cache(maxsize=1)
    def _message_processors(self):
        rv = []
        for attr_str in dir(self):
            if attr_str.startswith("_"):
                continue  # skip non-public attributes
            func = getattr(self, attr_str)
            if callable(func) and hasattr(
                func, "_decorated_for_process_message"
            ):
                rv.append(func)
        return rv

    async def process_message(self, message):
        logger.debug("Dispatching %r through %r...", message, self)
        for coro in self._message_processors():
            result = await coro(message)
            if isinstance(result, Message):
                return result


class MessageSink(BasePlugin, BaseMessageProcessor, ABC):
    class ProcessingOrder:
        # e.g. check is valid ipv4
        PRE_PROCESS_MESSAGE = 10
        # lfd plugin should process lfd alerts before other ignore plugins
        LFD = 18
        # e.g. for ignore_alert_with_whitelisted_ip
        IGNORE_MESSAGE = 20
        # Should be before check ip in graylist
        UNBLOCK_FROM_SUBNET = 30
        # Check ip in the graylist already
        CHECK_IP_IN_GRAYLIST = 40
        # Append ttl to alert
        GRAYLIST_TIMEOUT = 50
        # Store graylist to db
        GRAYLIST_DB_FIXUP = 55
        # this should run before IPSET_PROTECTOR
        IMPORT_EXPORT_WBLIST = 60
        # make ml prediction before lazy_init
        ML_PREDICTION = 70
        # the default
        DEFAULT = 80
        IPSET_PROTECTOR = DEFAULT
        WEBSHIELD_PROTECTOR = 81
        # should be run after ManageGrayList(DEFAULT)
        WHITELIST_UNBLOCKED = 90
        # Synclist timestamp update
        SYNCLIST_UPDATE = 100
        # post action
        POST_ACTION = 120
        # event hook processing
        EVENT_HOOK = 150
        # iContact
        ICONTACT_SENT = 200
        # e.g. Accumulate
        POST_PROCESS_MESSAGE = 999

    # alias for DEFAULT
    PROCESSING_ORDER = ProcessingOrder.DEFAULT

    @abstractmethod
    async def create_sink(self, loop):
        pass


def expect(*message_type, async_lock=None, **expect_fields):
    """
    @expect decorator for MessageSink.dosmth(message) async methods.

    MessageSink method will be called by MessageSink.process_message()
    if message_type and expect_fields match the message ones.

    @expect's can be stacked together and decision whether to call decorated
    coro is made by evaluating stacked @expect's with logical OR:

    @expect(MessageType.SensorAlert) # -- OR --
    @expect(MessageType.SensorIncident, plugin_id='ossec')
    def protect(message): ...
    """

    def decorate(coro):
        if getattr(coro, "__name__", "").startswith("_"):
            raise TypeError("{coro} is not public".format(coro=coro))

        @wraps(coro)
        async def decorated(self, message):
            def match():
                return isinstance(message, message_type) and all(
                    message.get(k) == v for k, v in expect_fields.items()
                )

            def is_stacked(coro):
                return hasattr(coro, "_decorated_for_process_message")

            def terminal(coro):
                if is_stacked(coro):
                    return terminal(coro._decorated_for_process_message)
                return coro

            # process stacked decorators with logical OR
            if match():
                if async_lock is True:
                    await message.acquire()
                try:
                    result = await terminal(coro)(self, message)
                except Exception as exc:
                    if (
                        isinstance(message, MessageType.Lockable)
                        and message.locked()
                    ):
                        message.release()
                    raise exc
                else:
                    if (
                        async_lock is False
                        and isinstance(message, MessageType.Lockable)
                        and message.locked()
                    ):
                        message.release()
                return result
            if is_stacked(coro):
                # Give next decorator a chance: logical OR
                return await coro(self, message)
            return None

        decorated._decorated_for_process_message = coro
        return decorated

    return decorate


_plugin_registry = set()


def thisguy(plugincls):
    """Register class as a plugin.

    >>> @thisguy
    >>> class ConcreteSink (MessageSink):
    >>>     ...
    """
    _plugin_registry.add(plugincls)
    return plugincls


def theseguys():
    """Enumerate classobj for registered plugins."""
    return _plugin_registry

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