cti-python-stix2/stix2/other.py

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"""STIX 2.0 Objects that are neither SDOs nor SROs"""
from .base import _STIXBase
from .properties import (IDProperty, ListProperty, Property, ReferenceProperty,
SelectorProperty, StringProperty, TimestampProperty,
TypeProperty)
from .utils import NOW, get_dict
class ExternalReference(_STIXBase):
_properties = {
'source_name': StringProperty(required=True),
'description': StringProperty(),
'url': StringProperty(),
'external_id': StringProperty(),
}
def _check_object_constraints(self):
super(ExternalReference, self)._check_object_constraints()
self._check_at_least_one_property(["description", "external_id", "url"])
class KillChainPhase(_STIXBase):
_properties = {
'kill_chain_name': StringProperty(required=True),
'phase_name': StringProperty(required=True),
}
class GranularMarking(_STIXBase):
_properties = {
'marking_ref': ReferenceProperty(required=True, type="marking-definition"),
'selectors': ListProperty(SelectorProperty, required=True),
}
class TLPMarking(_STIXBase):
# TODO: don't allow the creation of any other TLPMarkings than the ones below
_properties = {
'tlp': Property(required=True)
}
class StatementMarking(_STIXBase):
_properties = {
'statement': StringProperty(required=True)
}
def __init__(self, statement=None, **kwargs):
# Allow statement as positional args.
if statement and not kwargs.get('statement'):
kwargs['statement'] = statement
super(StatementMarking, self).__init__(**kwargs)
class MarkingProperty(Property):
"""Represent the marking objects in the `definition` property of
marking-definition objects.
"""
def clean(self, value):
if type(value) in [TLPMarking, StatementMarking]:
return value
else:
raise ValueError("must be a Statement or TLP Marking.")
class MarkingDefinition(_STIXBase):
_type = 'marking-definition'
_properties = {
'created': TimestampProperty(default=lambda: NOW, required=True),
'external_references': ListProperty(ExternalReference),
'created_by_ref': ReferenceProperty(type="identity"),
'object_marking_refs': ListProperty(ReferenceProperty(type="marking-definition")),
'granular_markings': ListProperty(GranularMarking),
'type': TypeProperty(_type),
'id': IDProperty(_type),
'definition_type': StringProperty(required=True),
'definition': MarkingProperty(required=True),
}
marking_map = {
'tlp': TLPMarking,
'statement': StatementMarking,
}
def __init__(self, **kwargs):
if set(('definition_type', 'definition')).issubset(kwargs.keys()):
# Create correct marking type object
try:
marking_type = self.marking_map[kwargs['definition_type']]
except KeyError:
raise ValueError("definition_type must be a valid marking type")
if not isinstance(kwargs['definition'], marking_type):
defn = get_dict(kwargs['definition'])
kwargs['definition'] = marking_type(**defn)
super(MarkingDefinition, self).__init__(**kwargs)
TLP_WHITE = MarkingDefinition(
id="marking-definition--613f2e26-407d-48c7-9eca-b8e91df99dc9",
created="2017-01-20T00:00:00.000Z",
definition_type="tlp",
definition=TLPMarking(tlp="white")
)
TLP_GREEN = MarkingDefinition(
id="marking-definition--34098fce-860f-48ae-8e50-ebd3cc5e41da",
created="2017-01-20T00:00:00.000Z",
definition_type="tlp",
definition=TLPMarking(tlp="green")
)
TLP_AMBER = MarkingDefinition(
id="marking-definition--f88d31f6-486f-44da-b317-01333bde0b82",
created="2017-01-20T00:00:00.000Z",
definition_type="tlp",
definition=TLPMarking(tlp="amber")
)
TLP_RED = MarkingDefinition(
id="marking-definition--5e57c739-391a-4eb3-b6be-7d15ca92d5ed",
created="2017-01-20T00:00:00.000Z",
definition_type="tlp",
definition=TLPMarking(tlp="red")
)