mirror of https://github.com/MISP/PyMISP
380 lines
13 KiB
Python
380 lines
13 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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from datetime import date, datetime
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from deprecated import deprecated # type: ignore
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from json import JSONEncoder
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from uuid import UUID
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from abc import ABCMeta
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try:
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from rapidjson import load # type: ignore
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from rapidjson import loads # type: ignore
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from rapidjson import dumps # type: ignore
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HAS_RAPIDJSON = True
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except ImportError:
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from json import load
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from json import loads
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from json import dumps
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HAS_RAPIDJSON = False
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import logging
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from enum import Enum
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from typing import Union, Optional
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from .exceptions import PyMISPInvalidFormat, PyMISPError
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from collections.abc import MutableMapping
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from functools import lru_cache
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from pathlib import Path
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logger = logging.getLogger('pymisp')
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resources_path = Path(__file__).parent / 'data'
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misp_objects_path = resources_path / 'misp-objects' / 'objects'
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with (resources_path / 'describeTypes.json').open('r') as f:
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describe_types = load(f)['result']
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class MISPFileCache(object):
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# cache up to 150 JSON structures in class attribute
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@staticmethod
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@lru_cache(maxsize=150)
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def _load_json(path: Path) -> Union[dict, None]:
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if not path.exists():
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return None
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with path.open('r') as f:
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if HAS_RAPIDJSON:
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data = load(f)
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else:
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data = load(f, encoding='utf-8')
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return data
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class Distribution(Enum):
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your_organisation_only = 0
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this_community_only = 1
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connected_communities = 2
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all_communities = 3
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sharing_group = 4
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inherit = 5
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class ThreatLevel(Enum):
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high = 1
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medium = 2
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low = 3
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undefined = 4
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class Analysis(Enum):
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initial = 0
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ongoing = 1
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completed = 2
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def _int_to_str(d: dict) -> dict:
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# transform all integer back to string
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for k, v in d.items():
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if isinstance(v, dict):
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d[k] = _int_to_str(v)
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elif isinstance(v, int) and not isinstance(v, bool):
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d[k] = str(v)
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return d
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@deprecated(reason=" Use method default=pymisp_json_default instead of cls=MISPEncode", version='2.4.117', action='default')
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class MISPEncode(JSONEncoder):
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def default(self, obj):
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if isinstance(obj, AbstractMISP):
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return obj.jsonable()
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elif isinstance(obj, (datetime, date)):
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return obj.isoformat()
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elif isinstance(obj, Enum):
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return obj.value
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elif isinstance(obj, UUID):
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return str(obj)
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return JSONEncoder.default(self, obj)
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class AbstractMISP(MutableMapping, MISPFileCache, metaclass=ABCMeta):
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__resources_path = resources_path
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__misp_objects_path = misp_objects_path
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__describe_types = describe_types
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def __init__(self, **kwargs):
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"""Abstract class for all the MISP objects.
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NOTE: Every method in every classes inheriting this one are doing
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changes in memory and do not modify data on a remote MISP instance.
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To do so, you need to call the respective add_* or update_*
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methods in ExpandedPyMISP/PyMISP.
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"""
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super().__init__()
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self.__edited: bool = True # As we create a new object, we assume it is edited
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self.__not_jsonable: list = []
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self._fields_for_feed: set
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self.__self_defined_describe_types: Union[dict, None] = None
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self.uuid: str
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if kwargs.get('force_timestamps') is not None:
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# Ignore the edited objects and keep the timestamps.
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self.__force_timestamps: bool = True
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else:
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self.__force_timestamps: bool = False
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@property
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def describe_types(self) -> dict:
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if self.__self_defined_describe_types:
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return self.__self_defined_describe_types
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return self.__describe_types
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@describe_types.setter
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def describe_types(self, describe_types: dict):
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self.__self_defined_describe_types = describe_types
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@property
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def resources_path(self) -> Path:
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return self.__resources_path
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@property
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def misp_objects_path(self) -> Path:
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return self.__misp_objects_path
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@misp_objects_path.setter
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def misp_objects_path(self, misp_objects_path: Union[str, Path]):
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if isinstance(misp_objects_path, str):
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misp_objects_path = Path(misp_objects_path)
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self.__misp_objects_path = misp_objects_path
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def from_dict(self, **kwargs) -> None:
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"""Loading all the parameters as class properties, if they aren't `None`.
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This method aims to be called when all the properties requiring a special
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treatment are processed.
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Note: This method is used when you initialize an object with existing data so by default,
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the class is flaged as not edited."""
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for prop, value in kwargs.items():
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if value is None:
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continue
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setattr(self, prop, value)
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# We load an existing dictionary, marking it an not-edited
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self.__edited = False
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def update_not_jsonable(self, *args) -> None:
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"""Add entries to the __not_jsonable list"""
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self.__not_jsonable += args
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def set_not_jsonable(self, args: list) -> None:
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"""Set __not_jsonable to a new list"""
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self.__not_jsonable = args
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def from_json(self, json_string: str) -> None:
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"""Load a JSON string"""
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self.from_dict(**loads(json_string))
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def to_dict(self) -> dict:
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"""Dump the class to a dictionary.
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This method automatically removes the timestamp recursively in every object
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that has been edited is order to let MISP update the event accordingly."""
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is_edited = self.edited
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to_return = {}
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for attribute, val in self.items():
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if val is None:
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continue
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elif isinstance(val, list) and len(val) == 0:
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continue
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elif isinstance(val, str):
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val = val.strip()
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if attribute == 'timestamp':
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if not self.__force_timestamps and is_edited:
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# In order to be accepted by MISP, the timestamp of an object
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# needs to be either newer, or None.
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# If the current object is marked as edited, the easiest is to
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# skip the timestamp and let MISP deal with it
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continue
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else:
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val = self._datetime_to_timestamp(val)
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if (attribute in ['first_seen', 'last_seen', 'datetime']
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and isinstance(val, datetime)
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and not val.tzinfo):
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# Need to make sure the timezone is set. Otherwise, it will be processed as UTC on the server
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val = val.astimezone()
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to_return[attribute] = val
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to_return = _int_to_str(to_return)
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return to_return
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def jsonable(self) -> dict:
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"""This method is used by the JSON encoder"""
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return self.to_dict()
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def _to_feed(self) -> dict:
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if not hasattr(self, '_fields_for_feed') or not self._fields_for_feed:
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raise PyMISPError('Unable to export in the feed format, _fields_for_feed is missing.')
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if hasattr(self, '_set_default') and callable(self._set_default): # type: ignore
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self._set_default() # type: ignore
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to_return = {}
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for field in self._fields_for_feed:
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if getattr(self, field, None) is not None:
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if field in ['timestamp', 'publish_timestamp']:
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to_return[field] = self._datetime_to_timestamp(getattr(self, field))
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elif isinstance(getattr(self, field), (datetime, date)):
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to_return[field] = getattr(self, field).isoformat()
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else:
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to_return[field] = getattr(self, field)
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else:
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if field in ['data', 'first_seen', 'last_seen']:
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# special fields
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continue
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raise PyMISPError('The field {} is required in {} when generating a feed.'.format(field, self.__class__.__name__))
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to_return = _int_to_str(to_return)
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return to_return
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def to_json(self, sort_keys: bool=False, indent: Optional[int]=None):
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"""Dump recursively any class of type MISPAbstract to a json string"""
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return dumps(self, default=pymisp_json_default, sort_keys=sort_keys, indent=indent)
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def __getitem__(self, key):
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try:
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if key[0] != '_' and key not in self.__not_jsonable:
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return self.__dict__[key]
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raise KeyError
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except AttributeError:
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# Expected by pop and other dict-related methods
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raise KeyError
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def __setitem__(self, key, value):
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setattr(self, key, value)
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def __delitem__(self, key):
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delattr(self, key)
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def __iter__(self):
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return iter({k: v for k, v in self.__dict__.items() if not (k[0] == '_' or k in self.__not_jsonable)})
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def __len__(self) -> int:
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return len([k for k in self.__dict__.keys() if not (k[0] == '_' or k in self.__not_jsonable)])
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@property
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def edited(self) -> bool:
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"""Recursively check if an object has been edited and update the flag accordingly
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to the parent objects"""
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if self.__edited:
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return self.__edited
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for p, val in self.items():
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if isinstance(val, AbstractMISP) and val.edited:
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self.__edited = True
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break
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elif isinstance(val, list) and all(isinstance(a, AbstractMISP) for a in val):
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if any(a.edited for a in val):
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self.__edited = True
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break
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return self.__edited
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@edited.setter
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def edited(self, val: bool):
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"""Set the edit flag"""
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if isinstance(val, bool):
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self.__edited = val
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else:
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raise PyMISPError('edited can only be True or False')
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def __setattr__(self, name: str, value):
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if name[0] != '_' and not self.__edited and name in self:
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# The private members don't matter
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# If we already have a key with that name, we're modifying it.
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self.__edited = True
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super().__setattr__(name, value)
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def _datetime_to_timestamp(self, d: Union[int, float, str, datetime]) -> int:
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"""Convert a datetime object to a timestamp (int)"""
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if isinstance(d, (int, float, str)):
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# Assume we already have a timestamp
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return int(d)
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return int(d.timestamp())
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def _add_tag(self, tag=None, **kwargs):
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"""Add a tag to the attribute (by name or a MISPTag object)"""
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if isinstance(tag, str):
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misp_tag = MISPTag()
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misp_tag.from_dict(name=tag)
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elif isinstance(tag, MISPTag):
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misp_tag = tag
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elif isinstance(tag, dict):
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misp_tag = MISPTag()
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misp_tag.from_dict(**tag)
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elif kwargs:
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misp_tag = MISPTag()
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misp_tag.from_dict(**kwargs)
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else:
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raise PyMISPInvalidFormat(f"The tag is in an invalid format (can be either string, MISPTag, or an expanded dict): {tag}")
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if misp_tag not in self.tags:
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self.Tag.append(misp_tag)
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self.edited = True
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return misp_tag
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def _set_tags(self, tags):
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"""Set a list of prepared MISPTag."""
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if all(isinstance(x, MISPTag) for x in tags):
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self.Tag = tags
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else:
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raise PyMISPInvalidFormat('All the attributes have to be of type MISPTag.')
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def __eq__(self, other) -> bool:
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if isinstance(other, AbstractMISP):
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return self.to_dict() == other.to_dict()
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elif isinstance(other, dict):
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return self.to_dict() == other
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else:
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return False
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def __repr__(self) -> str:
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return '<{self.__class__.__name__} - please define me>'.format(self=self)
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class MISPTag(AbstractMISP):
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_fields_for_feed: set = {'name', 'colour'}
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def __init__(self, **kwargs):
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super().__init__(**kwargs)
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self.name: str
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def from_dict(self, **kwargs):
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if kwargs.get('Tag'):
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kwargs = kwargs.get('Tag')
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super().from_dict(**kwargs)
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def _set_default(self):
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if not hasattr(self, 'colour'):
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self.colour = '#ffffff'
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def _to_feed(self):
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if hasattr(self, 'exportable') and not self.exportable:
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return False
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return super()._to_feed()
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if HAS_RAPIDJSON:
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def pymisp_json_default(obj: Union[AbstractMISP, datetime, date, Enum, UUID]) -> Union[dict, str]:
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if isinstance(obj, AbstractMISP):
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return obj.jsonable()
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elif isinstance(obj, (datetime, date)):
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return obj.isoformat()
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elif isinstance(obj, Enum):
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return obj.value
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elif isinstance(obj, UUID):
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return str(obj)
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else:
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def pymisp_json_default(obj: Union[AbstractMISP, datetime, date, Enum, UUID]) -> Union[dict, str]:
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if isinstance(obj, AbstractMISP):
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return obj.jsonable()
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elif isinstance(obj, (datetime, date)):
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return obj.isoformat()
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elif isinstance(obj, Enum):
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return obj.value
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elif isinstance(obj, UUID):
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return str(obj)
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