PyMISP/pymisp/mispevent.py

572 lines
22 KiB
Python

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import datetime
import time
import json
from json import JSONEncoder
import os
import warnings
import base64
from io import BytesIO
from zipfile import ZipFile
import hashlib
try:
from dateutil.parser import parse
except ImportError:
pass
try:
import jsonschema
except ImportError:
pass
try:
# pyme renamed to gpg the 2016-10-28
import gpg
from gpg.constants.sig import mode
has_pyme = True
except ImportError:
try:
# pyme renamed to gpg the 2016-10-28
import pyme as gpg
from pyme.constants.sig import mode
has_pyme = True
except ImportError:
has_pyme = False
from .exceptions import PyMISPError, NewEventError, NewAttributeError
# Least dirty way to support python 2 and 3
try:
basestring
unicode
warnings.warn("You're using python 2, it is strongly recommended to use python >=3.4")
except NameError:
basestring = str
unicode = str
class MISPAttribute(object):
def __init__(self, describe_types):
self.categories = describe_types['categories']
self.types = describe_types['types']
self.category_type_mapping = describe_types['category_type_mappings']
self.sane_default = describe_types['sane_defaults']
self._reinitialize_attribute()
def _reinitialize_attribute(self):
# Default values
self.category = None
self.type = None
self.value = None
self.to_ids = False
self.comment = ''
self.distribution = 5
# other possible values
self.data = None
self.encrypt = False
self.id = None
self.uuid = None
self.timestamp = None
self.sharing_group_id = None
self.deleted = None
self.sig = None
self.SharingGroup = []
self.ShadowAttribute = []
self.disable_correlation = False
self.RelatedAttribute = []
self.Tag = []
def _serialize(self):
return '{type}{category}{to_ids}{uuid}{timestamp}{comment}{deleted}{value}'.format(
type=self.type, category=self.category, to_ids=self.to_ids, uuid=self.uuid, timestamp=self.timestamp,
comment=self.comment, deleted=self.deleted, value=self.value).encode()
def sign(self, gpg_uid, passphrase=None):
if not has_pyme:
raise Exception('pyme is required, please install: pip install --pre pyme3. You will also need libgpg-error-dev and libgpgme11-dev.')
to_sign = self._serialize()
with gpg.Context() as c:
keys = list(c.keylist(gpg_uid))
c.signers = keys[:1]
if passphrase:
c.set_passphrase_cb(lambda *args: passphrase)
signed, _ = c.sign(to_sign, mode=mode.DETACH)
self.sig = base64.b64encode(signed).decode()
def delete(self):
self.deleted = True
def verify(self, gpg_uid):
if not has_pyme:
raise Exception('pyme is required, please install: pip install --pre pyme3. You will also need libgpg-error-dev and libgpgme11-dev.')
signed_data = self._serialize()
with gpg.Context() as c:
keys = list(c.keylist(gpg_uid))
try:
c.verify(signed_data, signature=base64.b64decode(self.sig), verify=keys[:1])
return {self.uuid: True}
except:
return {self.uuid: False}
def set_all_values(self, **kwargs):
if kwargs.get('type') and kwargs.get('category'):
if kwargs['type'] not in self.category_type_mapping[kwargs['category']]:
raise NewAttributeError('{} and {} is an invalid combinaison, type for this category has to be in {}'.format(self.type, self.category, (', '.join(self.category_type_mapping[kwargs['category']]))))
# Required
if kwargs.get('type'):
self.type = kwargs['type']
if self.type not in self.types:
raise NewAttributeError('{} is invalid, type has to be in {}'.format(self.type, (', '.join(self.types))))
elif not self.type:
raise NewAttributeError('The type of the attribute is required.')
type_defaults = self.sane_default[self.type]
if kwargs.get('value'):
self.value = kwargs['value']
elif not self.value:
raise NewAttributeError('The value of the attribute is required.')
# Default values
if kwargs.get('category'):
self.category = kwargs['category']
if self.category not in self.categories:
raise NewAttributeError('{} is invalid, category has to be in {}'.format(self.category, (', '.join(self.categories))))
else:
self.category = type_defaults['default_category']
if kwargs.get('to_ids'):
self.to_ids = kwargs['to_ids']
if not isinstance(self.to_ids, bool):
raise NewAttributeError('{} is invalid, to_ids has to be True or False'.format(self.to_ids))
else:
self.to_ids = bool(int(type_defaults['to_ids']))
if kwargs.get('comment'):
self.comment = kwargs['comment']
if kwargs.get('distribution'):
self.distribution = int(kwargs['distribution'])
if self.distribution not in [0, 1, 2, 3, 4, 5]:
raise NewAttributeError('{} is invalid, the distribution has to be in 0, 1, 2, 3, 4, 5'.format(self.distribution))
# other possible values
if kwargs.get('data'):
self.data = kwargs['data']
self._load_data()
if kwargs.get('id'):
self.id = int(kwargs['id'])
if kwargs.get('uuid'):
self.uuid = kwargs['uuid']
if kwargs.get('timestamp'):
self.timestamp = datetime.datetime.fromtimestamp(int(kwargs['timestamp']))
if kwargs.get('sharing_group_id'):
self.sharing_group_id = int(kwargs['sharing_group_id'])
if kwargs.get('deleted'):
self.deleted = kwargs['deleted']
if kwargs.get('SharingGroup'):
self.SharingGroup = kwargs['SharingGroup']
if kwargs.get('ShadowAttribute'):
self.ShadowAttribute = kwargs['ShadowAttribute']
if kwargs.get('sig'):
self.sig = kwargs['sig']
if kwargs.get('Tag'):
self.Tag = kwargs['Tag']
# If the user wants to disable correlation, let them. Defaults to False.
self.disable_correlation = kwargs.get("disable_correlation", False)
def _prepare_new_malware_sample(self):
if '|' in self.value:
# Get the filename, ignore the md5, because humans.
self.malware_filename, md5 = self.value.split('|')
else:
# Assuming the user only passed the filename
self.malware_filename = self.value
m = hashlib.md5()
m.update(self.data.getvalue())
md5 = m.hexdigest()
self.value = '{}|{}'.format(self.malware_filename, md5)
self.malware_binary = self.data
self.encrypt = True
def _load_data(self):
if not isinstance(self.data, BytesIO):
self.data = BytesIO(base64.b64decode(self.data))
if self.type == 'malware-sample':
try:
with ZipFile(self.data) as f:
for name in f.namelist():
if name.endswith('.txt'):
with f.open(name, pwd=b'infected') as unpacked:
self.malware_filename = unpacked.read().decode()
else:
with f.open(name, pwd=b'infected') as unpacked:
self.malware_binary = BytesIO(unpacked.read())
except:
# not a encrypted zip file, assuming it is a new malware sample
self._prepare_new_malware_sample()
def _json(self):
to_return = {'type': self.type, 'category': self.category, 'to_ids': self.to_ids,
'distribution': self.distribution, 'value': self.value,
'comment': self.comment, 'disable_correlation': self.disable_correlation}
if self.sig:
to_return['sig'] = self.sig
if self.sharing_group_id:
to_return['sharing_group_id'] = self.sharing_group_id
if self.Tag:
to_return['Event']['Tag'] = self.Tag
if self.data:
to_return['data'] = base64.b64encode(self.data.getvalue()).decode()
if self.encrypt:
to_return['entrypt'] = self.encrypt
to_return = _int_to_str(to_return)
return to_return
def _json_full(self):
to_return = self._json()
if self.id:
to_return['id'] = self.id
if self.uuid:
to_return['uuid'] = self.uuid
if self.timestamp:
to_return['timestamp'] = int(time.mktime(self.timestamp.timetuple()))
if self.deleted is not None:
to_return['deleted'] = self.deleted
if self.ShadowAttribute:
to_return['ShadowAttribute'] = self.ShadowAttribute
if self.SharingGroup:
to_return['SharingGroup'] = self.SharingGroup
to_return = _int_to_str(to_return)
return to_return
class EncodeUpdate(JSONEncoder):
def default(self, obj):
try:
return obj._json()
except AttributeError:
return JSONEncoder.default(self, obj)
class EncodeFull(JSONEncoder):
def default(self, obj):
try:
return obj._json_full()
except AttributeError:
return JSONEncoder.default(self, obj)
def _int_to_str(d):
# transform all integer back to string
for k, v in d.items():
if isinstance(v, int) and not isinstance(v, bool):
d[k] = str(v)
return d
class MISPEvent(object):
def __init__(self, describe_types=None):
self.ressources_path = os.path.join(os.path.abspath(os.path.dirname(__file__)), 'data')
with open(os.path.join(self.ressources_path, 'schema.json'), 'r') as f:
self.json_schema = json.load(f)
with open(os.path.join(self.ressources_path, 'schema-lax.json'), 'r') as f:
self.json_schema_lax = json.load(f)
if not describe_types:
t = json.load(open(os.path.join(self.ressources_path, 'describeTypes.json'), 'r'))
describe_types = t['result']
self.describe_types = describe_types
self.categories = describe_types['categories']
self.types = describe_types['types']
self.category_type_mapping = describe_types['category_type_mappings']
self.sane_default = describe_types['sane_defaults']
self.new = True
self.dump_full = False
self._reinitialize_event()
def _reinitialize_event(self):
# Default values for a valid event to send to a MISP instance
self.distribution = 3
self.threat_level_id = 2
self.analysis = 0
self.info = None
self.published = False
self.date = datetime.date.today()
self.attributes = []
# All other keys
self.sig = None
self.global_sig = None
self.id = None
self.orgc_id = None
self.org_id = None
self.uuid = None
self.attribute_count = None
self.timestamp = None
self.proposal_email_lock = None
self.locked = None
self.publish_timestamp = None
self.sharing_group_id = None
self.Org = None
self.Orgc = None
self.ShadowAttribute = []
self.RelatedEvent = []
self.Tag = []
self.Galaxy = None
def _serialize(self):
return '{date}{threat_level_id}{info}{uuid}{analysis}{timestamp}'.format(
date=self.date, threat_level_id=self.threat_level_id, info=self.info,
uuid=self.uuid, analysis=self.analysis, timestamp=self.timestamp).encode()
def _serialize_sigs(self):
all_sigs = self.sig
for a in self.attributes:
all_sigs += a.sig
return all_sigs.encode()
def sign(self, gpg_uid, passphrase=None):
if not has_pyme:
raise Exception('pyme is required, please install: pip install --pre pyme3. You will also need libgpg-error-dev and libgpgme11-dev.')
to_sign = self._serialize()
with gpg.Context() as c:
keys = list(c.keylist(gpg_uid))
c.signers = keys[:1]
if passphrase:
c.set_passphrase_cb(lambda *args: passphrase)
signed, _ = c.sign(to_sign, mode=mode.DETACH)
self.sig = base64.b64encode(signed).decode()
for a in self.attributes:
a.sign(gpg_uid, passphrase)
to_sign_global = self._serialize_sigs()
with gpg.Context() as c:
keys = list(c.keylist(gpg_uid))
c.signers = keys[:1]
if passphrase:
c.set_passphrase_cb(lambda *args: passphrase)
signed, _ = c.sign(to_sign_global, mode=mode.DETACH)
self.global_sig = base64.b64encode(signed).decode()
def verify(self, gpg_uid):
if not has_pyme:
raise Exception('pyme is required, please install: pip install --pre pyme3. You will also need libgpg-error-dev and libgpgme11-dev.')
to_return = {}
signed_data = self._serialize()
with gpg.Context() as c:
keys = list(c.keylist(gpg_uid))
try:
c.verify(signed_data, signature=base64.b64decode(self.sig), verify=keys[:1])
to_return[self.uuid] = True
except:
to_return[self.uuid] = False
for a in self.attributes:
to_return.update(a.verify(gpg_uid))
to_verify_global = self._serialize_sigs()
with gpg.Context() as c:
keys = list(c.keylist(gpg_uid))
try:
c.verify(to_verify_global, signature=base64.b64decode(self.global_sig), verify=keys[:1])
to_return['global'] = True
except:
to_return['global'] = False
return to_return
def load(self, json_event):
self.new = False
self.dump_full = True
if isinstance(json_event, basestring) and os.path.exists(json_event):
# NOTE: is it a good idea? (possible security issue if an untrusted user call this method)
json_event = open(json_event, 'r')
if hasattr(json_event, 'read'):
# python2 and python3 compatible to find if we have a file
json_event = json_event.read()
if isinstance(json_event, basestring):
json_event = json.loads(json_event)
if json_event.get('response'):
event = json_event.get('response')[0]
else:
event = json_event
if not event:
raise PyMISPError('Invalid event')
# Invalid event created by MISP up to 2.4.52 (attribute_count is none instead of '0')
if event.get('Event') and event.get('Event').get('attribute_count') is None:
event['Event']['attribute_count'] = '0'
jsonschema.validate(event, self.json_schema_lax)
e = event.get('Event')
self._reinitialize_event()
self.set_all_values(**e)
def set_date(self, date, ignore_invalid=False):
if isinstance(date, basestring) or isinstance(date, unicode):
self.date = parse(date).date()
elif isinstance(date, datetime.datetime):
self.date = date.date()
elif isinstance(date, datetime.date):
self.date = date
else:
if ignore_invalid:
self.date = datetime.date.today()
else:
raise NewEventError('Invalid format for the date: {} - {}'.format(date, type(date)))
def set_all_values(self, **kwargs):
# Required value
if kwargs.get('info'):
self.info = kwargs['info']
elif not self.info:
raise NewAttributeError('The info field of the new event is required.')
# Default values for a valid event to send to a MISP instance
if kwargs.get('distribution') is not None:
self.distribution = int(kwargs['distribution'])
if self.distribution not in [0, 1, 2, 3, 4]:
raise NewEventError('{} is invalid, the distribution has to be in 0, 1, 2, 3, 4'.format(self.distribution))
if kwargs.get('threat_level_id') is not None:
self.threat_level_id = int(kwargs['threat_level_id'])
if self.threat_level_id not in [1, 2, 3, 4]:
raise NewEventError('{} is invalid, the threat_level has to be in 1, 2, 3, 4'.format(self.threat_level_id))
if kwargs.get('analysis') is not None:
self.analysis = int(kwargs['analysis'])
if self.analysis not in [0, 1, 2]:
raise NewEventError('{} is invalid, the analysis has to be in 0, 1, 2'.format(self.analysis))
if kwargs.get('published') is not None:
self.publish()
if kwargs.get('date'):
self.set_date(kwargs['date'])
if kwargs.get('Attribute'):
for a in kwargs['Attribute']:
attribute = MISPAttribute(self.describe_types)
attribute.set_all_values(**a)
self.attributes.append(attribute)
# All other keys
if kwargs.get('id'):
self.id = int(kwargs['id'])
if kwargs.get('orgc_id'):
self.orgc_id = int(kwargs['orgc_id'])
if kwargs.get('org_id'):
self.org_id = int(kwargs['org_id'])
if kwargs.get('uuid'):
self.uuid = kwargs['uuid']
if kwargs.get('attribute_count'):
self.attribute_count = int(kwargs['attribute_count'])
if kwargs.get('timestamp'):
self.timestamp = datetime.datetime.fromtimestamp(int(kwargs['timestamp']))
if kwargs.get('proposal_email_lock'):
self.proposal_email_lock = kwargs['proposal_email_lock']
if kwargs.get('locked'):
self.locked = kwargs['locked']
if kwargs.get('publish_timestamp'):
self.publish_timestamp = datetime.datetime.fromtimestamp(int(kwargs['publish_timestamp']))
if kwargs.get('sharing_group_id'):
self.sharing_group_id = int(kwargs['sharing_group_id'])
if kwargs.get('Org'):
self.Org = kwargs['Org']
if kwargs.get('Orgc'):
self.Orgc = kwargs['Orgc']
if kwargs.get('ShadowAttribute'):
self.ShadowAttribute = kwargs['ShadowAttribute']
if kwargs.get('RelatedEvent'):
self.RelatedEvent = []
for rel_event in kwargs['RelatedEvent']:
sub_event = MISPEvent()
sub_event.load(rel_event)
self.RelatedEvent.append(sub_event)
if kwargs.get('Galaxy'):
self.Galaxy = kwargs['Galaxy']
if kwargs.get('Tag'):
self.Tag = kwargs['Tag']
if kwargs.get('sig'):
self.sig = kwargs['sig']
if kwargs.get('global_sig'):
self.global_sig = kwargs['global_sig']
def _json(self):
to_return = {'Event': {}}
to_return['Event'] = {'distribution': self.distribution, 'info': self.info,
'date': self.date.isoformat(), 'published': self.published,
'threat_level_id': self.threat_level_id,
'analysis': self.analysis, 'Attribute': []}
if self.sig:
to_return['Event']['sig'] = self.sig
if self.global_sig:
to_return['Event']['global_sig'] = self.global_sig
if self.uuid:
to_return['Event']['uuid'] = self.uuid
if self.Tag:
to_return['Event']['Tag'] = self.Tag
if self.Orgc:
to_return['Event']['Orgc'] = self.Orgc
if self.Galaxy:
to_return['Event']['Galaxy'] = self.Galaxy
if self.sharing_group_id:
to_return['Event']['sharing_group_id'] = self.sharing_group_id
to_return['Event'] = _int_to_str(to_return['Event'])
if self.attributes:
to_return['Event']['Attribute'] = [a._json() for a in self.attributes]
jsonschema.validate(to_return, self.json_schema)
return to_return
def _json_full(self):
to_return = self._json()
if self.id:
to_return['Event']['id'] = self.id
if self.orgc_id:
to_return['Event']['orgc_id'] = self.orgc_id
if self.org_id:
to_return['Event']['org_id'] = self.org_id
if self.locked is not None:
to_return['Event']['locked'] = self.locked
if self.attribute_count is not None:
to_return['Event']['attribute_count'] = self.attribute_count
if self.RelatedEvent:
to_return['Event']['RelatedEvent'] = []
for rel_event in self.RelatedEvent:
to_return['Event']['RelatedEvent'].append(rel_event._json_full())
if self.Org:
to_return['Event']['Org'] = self.Org
if self.sharing_group_id:
to_return['Event']['sharing_group_id'] = self.sharing_group_id
if self.ShadowAttribute:
to_return['Event']['ShadowAttribute'] = self.ShadowAttribute
if self.proposal_email_lock is not None:
to_return['Event']['proposal_email_lock'] = self.proposal_email_lock
if self.locked is not None:
to_return['Event']['locked'] = self.locked
if self.publish_timestamp:
to_return['Event']['publish_timestamp'] = int(time.mktime(self.publish_timestamp.timetuple()))
if self.timestamp:
to_return['Event']['timestamp'] = int(time.mktime(self.timestamp.timetuple()))
to_return['Event'] = _int_to_str(to_return['Event'])
if self.attributes:
to_return['Event']['Attribute'] = [a._json_full() for a in self.attributes]
jsonschema.validate(to_return, self.json_schema)
return to_return
def publish(self):
self.published = True
def unpublish(self):
self.published = False
def delete_attribute(self, attribute_id):
found = False
for a in self.attributes:
if a.id == attribute_id or a.uuid == attribute_id:
a.delete()
found = True
break
if not found:
raise Exception('No attribute with UUID/ID {} found.'.format(attribute_id))
def add_attribute(self, type, value, **kwargs):
attribute = MISPAttribute(self.describe_types)
attribute.set_all_values(type=type, value=value, **kwargs)
self.attributes.append(attribute)