2017-09-21 23:27:13 +02:00
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"""Base classes for type definitions in the stix2 library."""
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2017-02-10 22:35:02 +01:00
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import collections
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2017-05-02 20:06:42 +02:00
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import copy
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2017-02-10 22:35:02 +01:00
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import datetime as dt
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2017-08-15 19:40:47 +02:00
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2017-08-11 21:10:44 +02:00
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import simplejson as json
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2017-02-10 22:35:02 +01:00
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2018-04-13 17:18:56 +02:00
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from .exceptions import (AtLeastOnePropertyError, CustomContentError,
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DependentPropertiesError, ExtraPropertiesError,
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ImmutableError, InvalidObjRefError, InvalidValueError,
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2017-06-01 22:47:56 +02:00
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MissingPropertiesError,
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2018-04-13 17:18:56 +02:00
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MutuallyExclusivePropertiesError)
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2017-06-12 14:06:37 +02:00
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from .markings.utils import validate
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2017-08-31 22:36:59 +02:00
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from .utils import NOW, find_property_index, format_datetime, get_timestamp
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2017-08-31 18:28:07 +02:00
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from .utils import new_version as _new_version
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from .utils import revoke as _revoke
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2017-02-10 22:35:02 +01:00
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__all__ = ['STIXJSONEncoder', '_STIXBase']
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2017-05-16 18:27:30 +02:00
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DEFAULT_ERROR = "{type} must have {property}='{expected}'."
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2017-02-10 22:35:02 +01:00
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class STIXJSONEncoder(json.JSONEncoder):
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2018-04-16 20:37:07 +02:00
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"""Custom JSONEncoder subclass for serializing Python ``stix2`` objects.
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If an optional property with a default value specified in the STIX 2 spec
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is set to that default value, it will be left out of the serialized output.
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An example of this type of property include the ``revoked`` common property.
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"""
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def default(self, obj):
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if isinstance(obj, (dt.date, dt.datetime)):
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return format_datetime(obj)
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elif isinstance(obj, _STIXBase):
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tmp_obj = dict(copy.deepcopy(obj))
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for prop_name in obj._defaulted_optional_properties:
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del tmp_obj[prop_name]
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return tmp_obj
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else:
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return super(STIXJSONEncoder, self).default(obj)
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class STIXJSONIncludeOptionalDefaultsEncoder(json.JSONEncoder):
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"""Custom JSONEncoder subclass for serializing Python ``stix2`` objects.
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Differs from ``STIXJSONEncoder`` in that if an optional property with a default
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value specified in the STIX 2 spec is set to that default value, it will be
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included in the serialized output.
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"""
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2017-02-10 22:35:02 +01:00
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def default(self, obj):
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if isinstance(obj, (dt.date, dt.datetime)):
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return format_datetime(obj)
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elif isinstance(obj, _STIXBase):
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return dict(obj)
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else:
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2018-06-26 18:23:53 +02:00
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return super(STIXJSONIncludeOptionalDefaultsEncoder, self).default(obj)
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2017-02-10 22:35:02 +01:00
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2017-02-24 16:28:53 +01:00
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def get_required_properties(properties):
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2017-03-22 14:26:13 +01:00
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return (k for k, v in properties.items() if v.required)
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2017-02-24 16:28:53 +01:00
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2017-02-10 22:35:02 +01:00
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class _STIXBase(collections.Mapping):
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"""Base class for STIX object types"""
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2017-08-29 21:08:26 +02:00
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def object_properties(self):
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2017-11-03 19:17:36 +01:00
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props = set(self._properties.keys())
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custom_props = list(set(self._inner.keys()) - props)
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custom_props.sort()
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all_properties = list(self._properties.keys())
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all_properties.extend(custom_props) # Any custom properties to the bottom
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return all_properties
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2017-08-11 21:10:44 +02:00
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2018-04-12 22:33:08 +02:00
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def _check_property(self, prop_name, prop, kwargs):
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2017-02-24 17:20:24 +01:00
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if prop_name not in kwargs:
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2017-02-24 20:07:54 +01:00
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if hasattr(prop, 'default'):
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2017-03-22 01:15:06 +01:00
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value = prop.default()
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if value == NOW:
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value = self.__now
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kwargs[prop_name] = value
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2017-02-24 20:07:54 +01:00
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if prop_name in kwargs:
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try:
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2017-04-17 21:13:11 +02:00
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kwargs[prop_name] = prop.clean(kwargs[prop_name])
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2017-02-24 20:07:54 +01:00
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except ValueError as exc:
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2018-04-13 17:18:56 +02:00
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if self.__allow_custom and isinstance(exc, CustomContentError):
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2018-04-12 20:20:24 +02:00
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return
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2017-04-18 21:42:59 +02:00
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raise InvalidValueError(self.__class__, prop_name, reason=str(exc))
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2017-02-24 17:20:24 +01:00
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Changes so File object creation doesn't violate on of the MUSTs
Added three new exceptions: DependentPropertiestError, AtLeastOnePropertyError, MutuallyExclusivePropertiesError
Added tests for NetworkTraffic, Process, URL, WindowsRegistryKey and X509Certificate
Added error tests for EmailMessage, NetworkTraffic, Artifact,
Added interproperty checker methods to the base class: _check_mutually_exclusive_properties, _check_at_least_one_property and _check_properties_dependency
Added interproperty checkers to Artifact, EmailMIMEComponent, EmailMessage, NetworkTraffic
Made NetworkTraffic.protocols required
Added X509V3ExtenstionsType class
Use EmbeddedObjectProperty for X509Certificate.x509_v3_extensions
2017-05-11 21:22:46 +02:00
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# interproperty constraint methods
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def _check_mutually_exclusive_properties(self, list_of_properties, at_least_one=True):
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current_properties = self.properties_populated()
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2017-05-12 19:18:02 +02:00
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count = len(set(list_of_properties).intersection(current_properties))
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Changes so File object creation doesn't violate on of the MUSTs
Added three new exceptions: DependentPropertiestError, AtLeastOnePropertyError, MutuallyExclusivePropertiesError
Added tests for NetworkTraffic, Process, URL, WindowsRegistryKey and X509Certificate
Added error tests for EmailMessage, NetworkTraffic, Artifact,
Added interproperty checker methods to the base class: _check_mutually_exclusive_properties, _check_at_least_one_property and _check_properties_dependency
Added interproperty checkers to Artifact, EmailMIMEComponent, EmailMessage, NetworkTraffic
Made NetworkTraffic.protocols required
Added X509V3ExtenstionsType class
Use EmbeddedObjectProperty for X509Certificate.x509_v3_extensions
2017-05-11 21:22:46 +02:00
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# at_least_one allows for xor to be checked
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if count > 1 or (at_least_one and count == 0):
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raise MutuallyExclusivePropertiesError(self.__class__, list_of_properties)
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2017-05-17 21:33:28 +02:00
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def _check_at_least_one_property(self, list_of_properties=None):
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if not list_of_properties:
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list_of_properties = sorted(list(self.__class__._properties.keys()))
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2018-06-30 00:38:04 +02:00
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if 'type' in list_of_properties:
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list_of_properties.remove('type')
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Changes so File object creation doesn't violate on of the MUSTs
Added three new exceptions: DependentPropertiestError, AtLeastOnePropertyError, MutuallyExclusivePropertiesError
Added tests for NetworkTraffic, Process, URL, WindowsRegistryKey and X509Certificate
Added error tests for EmailMessage, NetworkTraffic, Artifact,
Added interproperty checker methods to the base class: _check_mutually_exclusive_properties, _check_at_least_one_property and _check_properties_dependency
Added interproperty checkers to Artifact, EmailMIMEComponent, EmailMessage, NetworkTraffic
Made NetworkTraffic.protocols required
Added X509V3ExtenstionsType class
Use EmbeddedObjectProperty for X509Certificate.x509_v3_extensions
2017-05-11 21:22:46 +02:00
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current_properties = self.properties_populated()
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2017-05-17 21:33:28 +02:00
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list_of_properties_populated = set(list_of_properties).intersection(current_properties)
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2018-06-30 00:38:04 +02:00
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if list_of_properties and (not list_of_properties_populated or list_of_properties_populated == set(['extensions'])):
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2017-05-12 19:18:02 +02:00
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raise AtLeastOnePropertyError(self.__class__, list_of_properties)
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Changes so File object creation doesn't violate on of the MUSTs
Added three new exceptions: DependentPropertiestError, AtLeastOnePropertyError, MutuallyExclusivePropertiesError
Added tests for NetworkTraffic, Process, URL, WindowsRegistryKey and X509Certificate
Added error tests for EmailMessage, NetworkTraffic, Artifact,
Added interproperty checker methods to the base class: _check_mutually_exclusive_properties, _check_at_least_one_property and _check_properties_dependency
Added interproperty checkers to Artifact, EmailMIMEComponent, EmailMessage, NetworkTraffic
Made NetworkTraffic.protocols required
Added X509V3ExtenstionsType class
Use EmbeddedObjectProperty for X509Certificate.x509_v3_extensions
2017-05-11 21:22:46 +02:00
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2017-06-02 19:48:44 +02:00
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def _check_properties_dependency(self, list_of_properties, list_of_dependent_properties):
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Changes so File object creation doesn't violate on of the MUSTs
Added three new exceptions: DependentPropertiestError, AtLeastOnePropertyError, MutuallyExclusivePropertiesError
Added tests for NetworkTraffic, Process, URL, WindowsRegistryKey and X509Certificate
Added error tests for EmailMessage, NetworkTraffic, Artifact,
Added interproperty checker methods to the base class: _check_mutually_exclusive_properties, _check_at_least_one_property and _check_properties_dependency
Added interproperty checkers to Artifact, EmailMIMEComponent, EmailMessage, NetworkTraffic
Made NetworkTraffic.protocols required
Added X509V3ExtenstionsType class
Use EmbeddedObjectProperty for X509Certificate.x509_v3_extensions
2017-05-11 21:22:46 +02:00
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failed_dependency_pairs = []
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for p in list_of_properties:
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for dp in list_of_dependent_properties:
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2017-06-08 14:42:32 +02:00
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if not self.get(p) and self.get(dp):
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Changes so File object creation doesn't violate on of the MUSTs
Added three new exceptions: DependentPropertiestError, AtLeastOnePropertyError, MutuallyExclusivePropertiesError
Added tests for NetworkTraffic, Process, URL, WindowsRegistryKey and X509Certificate
Added error tests for EmailMessage, NetworkTraffic, Artifact,
Added interproperty checker methods to the base class: _check_mutually_exclusive_properties, _check_at_least_one_property and _check_properties_dependency
Added interproperty checkers to Artifact, EmailMIMEComponent, EmailMessage, NetworkTraffic
Made NetworkTraffic.protocols required
Added X509V3ExtenstionsType class
Use EmbeddedObjectProperty for X509Certificate.x509_v3_extensions
2017-05-11 21:22:46 +02:00
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failed_dependency_pairs.append((p, dp))
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if failed_dependency_pairs:
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2017-05-19 19:51:59 +02:00
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raise DependentPropertiesError(self.__class__, failed_dependency_pairs)
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Changes so File object creation doesn't violate on of the MUSTs
Added three new exceptions: DependentPropertiestError, AtLeastOnePropertyError, MutuallyExclusivePropertiesError
Added tests for NetworkTraffic, Process, URL, WindowsRegistryKey and X509Certificate
Added error tests for EmailMessage, NetworkTraffic, Artifact,
Added interproperty checker methods to the base class: _check_mutually_exclusive_properties, _check_at_least_one_property and _check_properties_dependency
Added interproperty checkers to Artifact, EmailMIMEComponent, EmailMessage, NetworkTraffic
Made NetworkTraffic.protocols required
Added X509V3ExtenstionsType class
Use EmbeddedObjectProperty for X509Certificate.x509_v3_extensions
2017-05-11 21:22:46 +02:00
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2017-05-18 15:48:01 +02:00
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def _check_object_constraints(self):
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2018-06-30 00:38:04 +02:00
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for m in self.get('granular_markings', []):
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validate(self, m.get('selectors'))
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2017-05-09 21:28:32 +02:00
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2017-06-12 18:54:05 +02:00
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def __init__(self, allow_custom=False, **kwargs):
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2017-02-10 22:35:02 +01:00
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cls = self.__class__
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2018-04-12 22:33:08 +02:00
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self.__allow_custom = allow_custom
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2017-02-10 22:35:02 +01:00
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# Use the same timestamp for any auto-generated datetimes
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2017-02-24 16:28:53 +01:00
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self.__now = get_timestamp()
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2017-02-10 22:35:02 +01:00
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# Detect any keyword arguments not allowed for a specific type
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2017-06-09 18:20:40 +02:00
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custom_props = kwargs.pop('custom_properties', {})
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if custom_props and not isinstance(custom_props, dict):
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raise ValueError("'custom_properties' must be a dictionary")
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2018-05-17 15:04:44 +02:00
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if not self.__allow_custom:
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2018-05-16 21:37:30 +02:00
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extra_kwargs = list(set(kwargs) - set(self._properties))
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2017-06-12 18:54:05 +02:00
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if extra_kwargs:
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raise ExtraPropertiesError(cls, extra_kwargs)
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2018-05-17 15:04:44 +02:00
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if custom_props:
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self.__allow_custom = True
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2017-02-10 22:35:02 +01:00
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2017-05-04 22:34:08 +02:00
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# Remove any keyword arguments whose value is None
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setting_kwargs = {}
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2017-06-09 18:20:40 +02:00
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props = kwargs.copy()
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props.update(custom_props)
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for prop_name, prop_value in props.items():
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2017-06-01 21:25:03 +02:00
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if prop_value is not None:
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2017-05-04 22:34:08 +02:00
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setting_kwargs[prop_name] = prop_value
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2017-05-16 18:27:30 +02:00
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# Detect any missing required properties
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2018-05-16 21:37:30 +02:00
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required_properties = set(get_required_properties(self._properties))
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2018-04-16 20:37:07 +02:00
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missing_kwargs = required_properties - set(setting_kwargs)
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2017-02-10 22:35:02 +01:00
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if missing_kwargs:
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2017-05-19 19:51:59 +02:00
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raise MissingPropertiesError(cls, missing_kwargs)
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2017-02-10 22:35:02 +01:00
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2018-05-16 21:37:30 +02:00
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for prop_name, prop_metadata in self._properties.items():
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2018-04-12 22:33:08 +02:00
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self._check_property(prop_name, prop_metadata, setting_kwargs)
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2017-02-10 22:35:02 +01:00
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2018-04-16 20:37:07 +02:00
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# Cache defaulted optional properties for serialization
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defaulted = []
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2018-05-16 21:37:30 +02:00
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for name, prop in self._properties.items():
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2018-04-16 20:37:07 +02:00
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try:
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if (not prop.required and not hasattr(prop, '_fixed_value') and
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prop.default() == setting_kwargs[name]):
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defaulted.append(name)
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except (AttributeError, KeyError):
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continue
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self._defaulted_optional_properties = defaulted
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2017-05-04 22:34:08 +02:00
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self._inner = setting_kwargs
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2017-02-10 22:35:02 +01:00
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2017-05-18 15:48:01 +02:00
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self._check_object_constraints()
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2017-03-31 21:52:27 +02:00
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2017-02-10 22:35:02 +01:00
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def __getitem__(self, key):
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return self._inner[key]
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def __iter__(self):
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return iter(self._inner)
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def __len__(self):
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return len(self._inner)
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# Handle attribute access just like key access
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def __getattr__(self, name):
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2018-06-06 21:30:45 +02:00
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# Pickle-proofing: pickle invokes this on uninitialized instances (i.e.
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# __init__ has not run). So no "self" attributes are set yet. The
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# usual behavior of this method reads an __init__-assigned attribute,
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# which would cause infinite recursion. So this check disables all
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# attribute reads until the instance has been properly initialized.
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2018-06-30 00:38:04 +02:00
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unpickling = '_inner' not in self.__dict__
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2018-06-06 21:30:45 +02:00
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if not unpickling and name in self:
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2017-06-02 16:10:50 +02:00
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return self.__getitem__(name)
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2017-06-08 14:42:32 +02:00
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raise AttributeError("'%s' object has no attribute '%s'" %
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(self.__class__.__name__, name))
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2017-02-10 22:35:02 +01:00
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def __setattr__(self, name, value):
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2018-04-16 20:37:07 +02:00
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if not name.startswith("_"):
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2017-06-01 18:43:06 +02:00
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raise ImmutableError(self.__class__, name)
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2017-02-10 22:35:02 +01:00
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super(_STIXBase, self).__setattr__(name, value)
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def __str__(self):
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2017-11-03 13:02:32 +01:00
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return self.serialize(pretty=True)
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2017-02-10 22:58:17 +01:00
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def __repr__(self):
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2017-08-29 21:08:26 +02:00
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props = [(k, self[k]) for k in self.object_properties() if self.get(k)]
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2018-06-30 00:38:04 +02:00
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return '{0}({1})'.format(self.__class__.__name__,
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', '.join(['{0!s}={1!r}'.format(k, v) for k, v in props]))
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2017-05-03 20:10:10 +02:00
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2017-05-03 18:14:09 +02:00
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def __deepcopy__(self, memo):
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2018-02-19 20:44:28 +01:00
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# Assume: we can ignore the memo argument, because no object will ever contain the same sub-object multiple times.
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2017-05-03 18:14:09 +02:00
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new_inner = copy.deepcopy(self._inner, memo)
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cls = type(self)
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2018-02-19 20:44:28 +01:00
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if isinstance(self, _Observable):
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# Assume: valid references in the original object are still valid in the new version
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new_inner['_valid_refs'] = {'*': '*'}
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2018-04-16 20:37:07 +02:00
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new_inner['allow_custom'] = self.__allow_custom
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2017-05-03 18:14:09 +02:00
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return cls(**new_inner)
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2017-05-09 21:28:32 +02:00
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def properties_populated(self):
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return list(self._inner.keys())
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2017-05-02 20:06:42 +02:00
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# Versioning API
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def new_version(self, **kwargs):
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2017-08-31 18:28:07 +02:00
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|
|
return _new_version(self, **kwargs)
|
2017-05-02 20:06:42 +02:00
|
|
|
|
|
|
|
def revoke(self):
|
2017-08-31 18:28:07 +02:00
|
|
|
return _revoke(self)
|
2017-05-08 17:11:56 +02:00
|
|
|
|
2018-04-16 20:37:07 +02:00
|
|
|
def serialize(self, pretty=False, include_optional_defaults=False, **kwargs):
|
2017-11-03 13:02:32 +01:00
|
|
|
"""
|
|
|
|
Serialize a STIX object.
|
|
|
|
|
|
|
|
Args:
|
|
|
|
pretty (bool): If True, output properties following the STIX specs
|
|
|
|
formatting. This includes indentation. Refer to notes for more
|
2018-03-13 21:01:42 +01:00
|
|
|
details. (Default: ``False``)
|
2018-04-16 20:37:07 +02:00
|
|
|
include_optional_defaults (bool): Determines whether to include
|
|
|
|
optional properties set to the default value defined in the spec.
|
2017-11-03 13:02:32 +01:00
|
|
|
**kwargs: The arguments for a json.dumps() call.
|
|
|
|
|
2018-06-08 21:42:59 +02:00
|
|
|
Examples:
|
|
|
|
>>> import stix2
|
|
|
|
>>> identity = stix2.Identity(name='Example Corp.', identity_class='organization')
|
|
|
|
>>> print(identity.serialize(sort_keys=True))
|
|
|
|
{"created": "2018-06-08T19:03:54.066Z", ... "name": "Example Corp.", "type": "identity"}
|
|
|
|
>>> print(identity.serialize(sort_keys=True, indent=4))
|
|
|
|
{
|
|
|
|
"created": "2018-06-08T19:03:54.066Z",
|
|
|
|
"id": "identity--d7f3e25a-ba1c-447a-ab71-6434b092b05e",
|
|
|
|
"identity_class": "organization",
|
|
|
|
"modified": "2018-06-08T19:03:54.066Z",
|
|
|
|
"name": "Example Corp.",
|
|
|
|
"type": "identity"
|
|
|
|
}
|
|
|
|
|
2017-11-03 13:02:32 +01:00
|
|
|
Returns:
|
2018-03-16 19:26:41 +01:00
|
|
|
str: The serialized JSON object.
|
2017-11-03 13:02:32 +01:00
|
|
|
|
2018-07-06 20:11:59 +02:00
|
|
|
Notes:
|
2017-11-03 13:02:32 +01:00
|
|
|
The argument ``pretty=True`` will output the STIX object following
|
|
|
|
spec order. Using this argument greatly impacts object serialization
|
|
|
|
performance. If your use case is centered across machine-to-machine
|
|
|
|
operation it is recommended to set ``pretty=False``.
|
|
|
|
|
|
|
|
When ``pretty=True`` the following key-value pairs will be added or
|
|
|
|
overridden: indent=4, separators=(",", ": "), item_sort_key=sort_by.
|
|
|
|
"""
|
|
|
|
if pretty:
|
|
|
|
def sort_by(element):
|
2018-06-15 03:29:50 +02:00
|
|
|
return find_property_index(self, *element)
|
2017-11-03 13:02:32 +01:00
|
|
|
|
2018-06-30 00:38:04 +02:00
|
|
|
kwargs.update({'indent': 4, 'separators': (',', ': '), 'item_sort_key': sort_by})
|
2017-11-03 13:02:32 +01:00
|
|
|
|
2018-04-16 20:37:07 +02:00
|
|
|
if include_optional_defaults:
|
|
|
|
return json.dumps(self, cls=STIXJSONIncludeOptionalDefaultsEncoder, **kwargs)
|
|
|
|
else:
|
|
|
|
return json.dumps(self, cls=STIXJSONEncoder, **kwargs)
|
2017-11-03 13:02:32 +01:00
|
|
|
|
2017-05-03 20:10:10 +02:00
|
|
|
|
2017-05-10 00:03:46 +02:00
|
|
|
class _Observable(_STIXBase):
|
2017-05-05 18:32:02 +02:00
|
|
|
|
|
|
|
def __init__(self, **kwargs):
|
2017-05-09 03:03:15 +02:00
|
|
|
# the constructor might be called independently of an observed data object
|
2018-05-16 18:14:33 +02:00
|
|
|
self._STIXBase__valid_refs = kwargs.pop('_valid_refs', [])
|
|
|
|
|
|
|
|
self.__allow_custom = kwargs.get('allow_custom', False)
|
|
|
|
self._properties['extensions'].allow_custom = kwargs.get('allow_custom', False)
|
|
|
|
|
2017-05-10 00:03:46 +02:00
|
|
|
super(_Observable, self).__init__(**kwargs)
|
2017-05-05 18:32:02 +02:00
|
|
|
|
2017-05-17 21:21:02 +02:00
|
|
|
def _check_ref(self, ref, prop, prop_name):
|
2018-02-19 20:44:28 +01:00
|
|
|
if '*' in self._STIXBase__valid_refs:
|
|
|
|
return # don't check if refs are valid
|
|
|
|
|
2017-05-17 21:21:02 +02:00
|
|
|
if ref not in self._STIXBase__valid_refs:
|
|
|
|
raise InvalidObjRefError(self.__class__, prop_name, "'%s' is not a valid object in local scope" % ref)
|
|
|
|
|
|
|
|
try:
|
|
|
|
allowed_types = prop.contained.valid_types
|
|
|
|
except AttributeError:
|
2017-08-30 21:33:28 +02:00
|
|
|
allowed_types = prop.valid_types
|
|
|
|
|
|
|
|
try:
|
|
|
|
ref_type = self._STIXBase__valid_refs[ref]
|
|
|
|
except TypeError:
|
|
|
|
raise ValueError("'%s' must be created with _valid_refs as a dict, not a list." % self.__class__.__name__)
|
2017-05-17 21:21:02 +02:00
|
|
|
|
|
|
|
if allowed_types:
|
|
|
|
if ref_type not in allowed_types:
|
|
|
|
raise InvalidObjRefError(self.__class__, prop_name, "object reference '%s' is of an invalid type '%s'" % (ref, ref_type))
|
|
|
|
|
2018-04-12 22:33:08 +02:00
|
|
|
def _check_property(self, prop_name, prop, kwargs):
|
|
|
|
super(_Observable, self)._check_property(prop_name, prop, kwargs)
|
2017-05-17 21:21:02 +02:00
|
|
|
if prop_name not in kwargs:
|
|
|
|
return
|
|
|
|
|
|
|
|
if prop_name.endswith('_ref'):
|
2017-05-09 17:03:19 +02:00
|
|
|
ref = kwargs[prop_name]
|
2017-05-17 21:21:02 +02:00
|
|
|
self._check_ref(ref, prop, prop_name)
|
|
|
|
elif prop_name.endswith('_refs'):
|
2017-05-09 17:03:19 +02:00
|
|
|
for ref in kwargs[prop_name]:
|
2017-05-17 21:21:02 +02:00
|
|
|
self._check_ref(ref, prop, prop_name)
|
2017-05-18 20:04:28 +02:00
|
|
|
|
|
|
|
|
|
|
|
class _Extension(_STIXBase):
|
|
|
|
|
|
|
|
def _check_object_constraints(self):
|
|
|
|
super(_Extension, self)._check_object_constraints()
|
|
|
|
self._check_at_least_one_property()
|