949 lines
33 KiB
Python
949 lines
33 KiB
Python
"""STIX 2.0 Cyber Observable Objects.
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Embedded observable object types, such as Email MIME Component, which is
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embedded in Email Message objects, inherit from ``_STIXBase`` instead of
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Observable and do not have a ``_type`` attribute.
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"""
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from collections import OrderedDict
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from ..base import _Extension, _Observable, _STIXBase
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from ..exceptions import (AtLeastOnePropertyError, DependentPropertiesError,
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ParseError)
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from ..properties import (BinaryProperty, BooleanProperty, DictionaryProperty,
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EmbeddedObjectProperty, EnumProperty, FloatProperty,
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HashesProperty, HexProperty, IntegerProperty,
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ListProperty, ObjectReferenceProperty, Property,
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StringProperty, TimestampProperty, TypeProperty)
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from ..utils import get_dict
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class ObservableProperty(Property):
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"""Property for holding Cyber Observable Objects.
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"""
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def clean(self, value):
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try:
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dictified = get_dict(value)
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except ValueError:
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raise ValueError("The observable property must contain a dictionary")
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if dictified == {}:
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raise ValueError("The observable property must contain a non-empty dictionary")
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valid_refs = dict((k, v['type']) for (k, v) in dictified.items())
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for key, obj in dictified.items():
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parsed_obj = parse_observable(obj, valid_refs)
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dictified[key] = parsed_obj
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return dictified
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class ExtensionsProperty(DictionaryProperty):
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"""Property for representing extensions on Observable objects.
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"""
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def __init__(self, enclosing_type=None, required=False):
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self.enclosing_type = enclosing_type
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super(ExtensionsProperty, self).__init__(required)
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def clean(self, value):
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try:
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dictified = get_dict(value)
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except ValueError:
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raise ValueError("The extensions property must contain a dictionary")
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if dictified == {}:
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raise ValueError("The extensions property must contain a non-empty dictionary")
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if self.enclosing_type in EXT_MAP:
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specific_type_map = EXT_MAP[self.enclosing_type]
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for key, subvalue in dictified.items():
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if key in specific_type_map:
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cls = specific_type_map[key]
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if type(subvalue) is dict:
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dictified[key] = cls(**subvalue)
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elif type(subvalue) is cls:
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dictified[key] = subvalue
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else:
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raise ValueError("Cannot determine extension type.")
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else:
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raise ValueError("The key used in the extensions dictionary is not an extension type name")
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else:
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raise ValueError("The enclosing type '%s' has no extensions defined" % self.enclosing_type)
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return dictified
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class Artifact(_Observable):
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_type = 'artifact'
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_properties = OrderedDict()
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_properties.update([
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('type', TypeProperty(_type)),
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('mime_type', StringProperty()),
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('payload_bin', BinaryProperty()),
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('url', StringProperty()),
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('hashes', HashesProperty()),
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('extensions', ExtensionsProperty(enclosing_type=_type)),
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])
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def _check_object_constraints(self):
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super(Artifact, self)._check_object_constraints()
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self._check_mutually_exclusive_properties(["payload_bin", "url"])
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self._check_properties_dependency(["hashes"], ["url"])
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class AutonomousSystem(_Observable):
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_type = 'autonomous-system'
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_properties = OrderedDict()
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_properties.update([
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('type', TypeProperty(_type)),
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('number', IntegerProperty(required=True)),
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('name', StringProperty()),
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('rir', StringProperty()),
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('extensions', ExtensionsProperty(enclosing_type=_type)),
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])
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class Directory(_Observable):
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_type = 'directory'
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_properties = OrderedDict()
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_properties.update([
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('type', TypeProperty(_type)),
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('path', StringProperty(required=True)),
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('path_enc', StringProperty()),
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# these are not the created/modified timestamps of the object itself
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('created', TimestampProperty()),
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('modified', TimestampProperty()),
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('accessed', TimestampProperty()),
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('contains_refs', ListProperty(ObjectReferenceProperty(valid_types=['file', 'directory']))),
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('extensions', ExtensionsProperty(enclosing_type=_type)),
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])
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class DomainName(_Observable):
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_type = 'domain-name'
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_properties = OrderedDict()
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_properties.update([
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('type', TypeProperty(_type)),
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('value', StringProperty(required=True)),
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('resolves_to_refs', ListProperty(ObjectReferenceProperty(valid_types=['ipv4-addr', 'ipv6-addr', 'domain-name']))),
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('extensions', ExtensionsProperty(enclosing_type=_type)),
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])
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class EmailAddress(_Observable):
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_type = 'email-addr'
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_properties = OrderedDict()
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_properties.update([
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('type', TypeProperty(_type)),
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('value', StringProperty(required=True)),
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('display_name', StringProperty()),
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('belongs_to_ref', ObjectReferenceProperty(valid_types='user-account')),
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('extensions', ExtensionsProperty(enclosing_type=_type)),
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])
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class EmailMIMEComponent(_STIXBase):
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_properties = OrderedDict()
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_properties.update([
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('body', StringProperty()),
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('body_raw_ref', ObjectReferenceProperty(valid_types=['artifact', 'file'])),
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('content_type', StringProperty()),
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('content_disposition', StringProperty()),
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])
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def _check_object_constraints(self):
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super(EmailMIMEComponent, self)._check_object_constraints()
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self._check_at_least_one_property(["body", "body_raw_ref"])
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class EmailMessage(_Observable):
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_type = 'email-message'
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_properties = OrderedDict()
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_properties.update([
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('type', TypeProperty(_type)),
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('is_multipart', BooleanProperty(required=True)),
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('date', TimestampProperty()),
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('content_type', StringProperty()),
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('from_ref', ObjectReferenceProperty(valid_types='email-addr')),
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('sender_ref', ObjectReferenceProperty(valid_types='email-addr')),
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('to_refs', ListProperty(ObjectReferenceProperty(valid_types='email-addr'))),
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('cc_refs', ListProperty(ObjectReferenceProperty(valid_types='email-addr'))),
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('bcc_refs', ListProperty(ObjectReferenceProperty(valid_types='email-addr'))),
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('subject', StringProperty()),
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('received_lines', ListProperty(StringProperty)),
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('additional_header_fields', DictionaryProperty()),
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('body', StringProperty()),
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('body_multipart', ListProperty(EmbeddedObjectProperty(type=EmailMIMEComponent))),
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('raw_email_ref', ObjectReferenceProperty(valid_types='artifact')),
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('extensions', ExtensionsProperty(enclosing_type=_type)),
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])
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def _check_object_constraints(self):
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super(EmailMessage, self)._check_object_constraints()
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self._check_properties_dependency(["is_multipart"], ["body_multipart"])
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if self.get("is_multipart") is True and self.get("body"):
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# 'body' MAY only be used if is_multipart is false.
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raise DependentPropertiesError(self.__class__, [("is_multipart", "body")])
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class ArchiveExt(_Extension):
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_type = 'archive-ext'
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_properties = OrderedDict()
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_properties.update([
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('contains_refs', ListProperty(ObjectReferenceProperty(valid_types='file'), required=True)),
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('version', StringProperty()),
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('comment', StringProperty()),
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])
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class AlternateDataStream(_STIXBase):
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_properties = OrderedDict()
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_properties.update([
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('name', StringProperty(required=True)),
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('hashes', HashesProperty()),
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('size', IntegerProperty()),
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])
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class NTFSExt(_Extension):
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_type = 'ntfs-ext'
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_properties = OrderedDict()
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_properties.update([
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('sid', StringProperty()),
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('alternate_data_streams', ListProperty(EmbeddedObjectProperty(type=AlternateDataStream))),
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])
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class PDFExt(_Extension):
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_type = 'pdf-ext'
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_properties = OrderedDict()
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_properties.update([
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('version', StringProperty()),
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('is_optimized', BooleanProperty()),
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('document_info_dict', DictionaryProperty()),
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('pdfid0', StringProperty()),
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('pdfid1', StringProperty()),
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])
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class RasterImageExt(_Extension):
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_type = 'raster-image-ext'
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_properties = OrderedDict()
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_properties.update([
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('image_height', IntegerProperty()),
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('image_weight', IntegerProperty()),
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('bits_per_pixel', IntegerProperty()),
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('image_compression_algorithm', StringProperty()),
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('exif_tags', DictionaryProperty()),
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])
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class WindowsPEOptionalHeaderType(_STIXBase):
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_properties = OrderedDict()
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_properties.update([
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('magic_hex', HexProperty()),
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('major_linker_version', IntegerProperty()),
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('minor_linker_version', IntegerProperty()),
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('size_of_code', IntegerProperty()),
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('size_of_initialized_data', IntegerProperty()),
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('size_of_uninitialized_data', IntegerProperty()),
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('address_of_entry_point', IntegerProperty()),
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('base_of_code', IntegerProperty()),
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('base_of_data', IntegerProperty()),
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('image_base', IntegerProperty()),
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('section_alignment', IntegerProperty()),
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('file_alignment', IntegerProperty()),
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('major_os_version', IntegerProperty()),
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('minor_os_version', IntegerProperty()),
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('major_image_version', IntegerProperty()),
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('minor_image_version', IntegerProperty()),
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('major_subsystem_version', IntegerProperty()),
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('minor_subsystem_version', IntegerProperty()),
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('win32_version_value_hex', HexProperty()),
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('size_of_image', IntegerProperty()),
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('size_of_headers', IntegerProperty()),
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('checksum_hex', HexProperty()),
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('subsystem_hex', HexProperty()),
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('dll_characteristics_hex', HexProperty()),
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('size_of_stack_reserve', IntegerProperty()),
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('size_of_stack_commit', IntegerProperty()),
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('size_of_heap_reserve', IntegerProperty()),
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('size_of_heap_commit', IntegerProperty()),
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('loader_flags_hex', HexProperty()),
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('number_of_rva_and_sizes', IntegerProperty()),
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('hashes', HashesProperty()),
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])
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def _check_object_constraints(self):
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super(WindowsPEOptionalHeaderType, self)._check_object_constraints()
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self._check_at_least_one_property()
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class WindowsPESection(_STIXBase):
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_properties = OrderedDict()
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_properties.update([
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('name', StringProperty(required=True)),
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('size', IntegerProperty()),
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('entropy', FloatProperty()),
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('hashes', HashesProperty()),
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])
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class WindowsPEBinaryExt(_Extension):
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_type = 'windows-pebinary-ext'
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_properties = OrderedDict()
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_properties.update([
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('pe_type', StringProperty(required=True)), # open_vocab
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('imphash', StringProperty()),
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('machine_hex', HexProperty()),
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('number_of_sections', IntegerProperty()),
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('time_date_stamp', TimestampProperty(precision='second')),
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('pointer_to_symbol_table_hex', HexProperty()),
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('number_of_symbols', IntegerProperty()),
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('size_of_optional_header', IntegerProperty()),
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('characteristics_hex', HexProperty()),
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('file_header_hashes', HashesProperty()),
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('optional_header', EmbeddedObjectProperty(type=WindowsPEOptionalHeaderType)),
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('sections', ListProperty(EmbeddedObjectProperty(type=WindowsPESection))),
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])
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class File(_Observable):
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_type = 'file'
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_properties = OrderedDict()
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_properties.update([
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('type', TypeProperty(_type)),
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('hashes', HashesProperty()),
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('size', IntegerProperty()),
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('name', StringProperty()),
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('name_enc', StringProperty()),
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('magic_number_hex', HexProperty()),
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('mime_type', StringProperty()),
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# these are not the created/modified timestamps of the object itself
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('created', TimestampProperty()),
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('modified', TimestampProperty()),
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('accessed', TimestampProperty()),
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('parent_directory_ref', ObjectReferenceProperty(valid_types='directory')),
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('is_encrypted', BooleanProperty()),
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('encryption_algorithm', StringProperty()),
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('decryption_key', StringProperty()),
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('contains_refs', ListProperty(ObjectReferenceProperty)),
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('content_ref', ObjectReferenceProperty(valid_types='artifact')),
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('extensions', ExtensionsProperty(enclosing_type=_type)),
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])
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def _check_object_constraints(self):
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super(File, self)._check_object_constraints()
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self._check_properties_dependency(["is_encrypted"], ["encryption_algorithm", "decryption_key"])
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self._check_at_least_one_property(["hashes", "name"])
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class IPv4Address(_Observable):
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_type = 'ipv4-addr'
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_properties = OrderedDict()
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_properties.update([
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('type', TypeProperty(_type)),
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('value', StringProperty(required=True)),
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('resolves_to_refs', ListProperty(ObjectReferenceProperty(valid_types='mac-addr'))),
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('belongs_to_refs', ListProperty(ObjectReferenceProperty(valid_types='autonomous-system'))),
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('extensions', ExtensionsProperty(enclosing_type=_type)),
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])
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class IPv6Address(_Observable):
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_type = 'ipv6-addr'
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_properties = OrderedDict()
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_properties.update([
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('type', TypeProperty(_type)),
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('value', StringProperty(required=True)),
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('resolves_to_refs', ListProperty(ObjectReferenceProperty(valid_types='mac-addr'))),
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('belongs_to_refs', ListProperty(ObjectReferenceProperty(valid_types='autonomous-system'))),
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('extensions', ExtensionsProperty(enclosing_type=_type)),
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])
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class MACAddress(_Observable):
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_type = 'mac-addr'
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_properties = OrderedDict()
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_properties.update([
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('type', TypeProperty(_type)),
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('value', StringProperty(required=True)),
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('extensions', ExtensionsProperty(enclosing_type=_type)),
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])
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class Mutex(_Observable):
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_type = 'mutex'
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_properties = OrderedDict()
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_properties.update([
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('type', TypeProperty(_type)),
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('name', StringProperty(required=True)),
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('extensions', ExtensionsProperty(enclosing_type=_type)),
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])
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class HTTPRequestExt(_Extension):
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_type = 'http-request-ext'
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_properties = OrderedDict()
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_properties.update([
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('request_method', StringProperty(required=True)),
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('request_value', StringProperty(required=True)),
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('request_version', StringProperty()),
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('request_header', DictionaryProperty()),
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('message_body_length', IntegerProperty()),
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('message_body_data_ref', ObjectReferenceProperty(valid_types='artifact')),
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])
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class ICMPExt(_Extension):
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_type = 'icmp-ext'
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_properties = OrderedDict()
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_properties.update([
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('icmp_type_hex', HexProperty(required=True)),
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('icmp_code_hex', HexProperty(required=True)),
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])
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class SocketExt(_Extension):
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_type = 'socket-ext'
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_properties = OrderedDict()
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_properties.update([
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('address_family', EnumProperty(allowed=[
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"AF_UNSPEC",
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"AF_INET",
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"AF_IPX",
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"AF_APPLETALK",
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"AF_NETBIOS",
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"AF_INET6",
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"AF_IRDA",
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"AF_BTH",
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], required=True)),
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('is_blocking', BooleanProperty()),
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('is_listening', BooleanProperty()),
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('protocol_family', EnumProperty(allowed=[
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"PF_INET",
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"PF_IPX",
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"PF_APPLETALK",
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"PF_INET6",
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"PF_AX25",
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"PF_NETROM"
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])),
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('options', DictionaryProperty()),
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('socket_type', EnumProperty(allowed=[
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"SOCK_STREAM",
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"SOCK_DGRAM",
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"SOCK_RAW",
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"SOCK_RDM",
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"SOCK_SEQPACKET",
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])),
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('socket_descriptor', IntegerProperty()),
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('socket_handle', IntegerProperty()),
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])
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class TCPExt(_Extension):
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_type = 'tcp-ext'
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_properties = OrderedDict()
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_properties.update([
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('src_flags_hex', HexProperty()),
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('dst_flags_hex', HexProperty()),
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])
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class NetworkTraffic(_Observable):
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_type = 'network-traffic'
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_properties = OrderedDict()
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_properties.update([
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('type', TypeProperty(_type)),
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('start', TimestampProperty()),
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('end', TimestampProperty()),
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('is_active', BooleanProperty()),
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('src_ref', ObjectReferenceProperty(valid_types=['ipv4-addr', 'ipv6-addr', 'mac-addr', 'domain-name'])),
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('dst_ref', ObjectReferenceProperty(valid_types=['ipv4-addr', 'ipv6-addr', 'mac-addr', 'domain-name'])),
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('src_port', IntegerProperty()),
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('dst_port', IntegerProperty()),
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('protocols', ListProperty(StringProperty, required=True)),
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('src_byte_count', IntegerProperty()),
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('dst_byte_count', IntegerProperty()),
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('src_packets', IntegerProperty()),
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('dst_packets', IntegerProperty()),
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('ipfix', DictionaryProperty()),
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('src_payload_ref', ObjectReferenceProperty(valid_types='artifact')),
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('dst_payload_ref', ObjectReferenceProperty(valid_types='artifact')),
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('encapsulates_refs', ListProperty(ObjectReferenceProperty(valid_types='network-traffic'))),
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('encapsulates_by_ref', ObjectReferenceProperty(valid_types='network-traffic')),
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('extensions', ExtensionsProperty(enclosing_type=_type)),
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])
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def _check_object_constraints(self):
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super(NetworkTraffic, self)._check_object_constraints()
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self._check_at_least_one_property(["src_ref", "dst_ref"])
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class WindowsProcessExt(_Extension):
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_type = 'windows-process-ext'
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_properties = OrderedDict()
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_properties.update([
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('aslr_enabled', BooleanProperty()),
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('dep_enabled', BooleanProperty()),
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('priority', StringProperty()),
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('owner_sid', StringProperty()),
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('window_title', StringProperty()),
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('startup_info', DictionaryProperty()),
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])
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class WindowsServiceExt(_Extension):
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_type = 'windows-service-ext'
|
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_properties = OrderedDict()
|
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_properties.update([
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('service_name', StringProperty(required=True)),
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('descriptions', ListProperty(StringProperty)),
|
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('display_name', StringProperty()),
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('group_name', StringProperty()),
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('start_type', EnumProperty(allowed=[
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"SERVICE_AUTO_START",
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"SERVICE_BOOT_START",
|
|
"SERVICE_DEMAND_START",
|
|
"SERVICE_DISABLED",
|
|
"SERVICE_SYSTEM_ALERT",
|
|
])),
|
|
('service_dll_refs', ListProperty(ObjectReferenceProperty(valid_types='file'))),
|
|
('service_type', EnumProperty(allowed=[
|
|
"SERVICE_KERNEL_DRIVER",
|
|
"SERVICE_FILE_SYSTEM_DRIVER",
|
|
"SERVICE_WIN32_OWN_PROCESS",
|
|
"SERVICE_WIN32_SHARE_PROCESS",
|
|
])),
|
|
('service_status', EnumProperty(allowed=[
|
|
"SERVICE_CONTINUE_PENDING",
|
|
"SERVICE_PAUSE_PENDING",
|
|
"SERVICE_PAUSED",
|
|
"SERVICE_RUNNING",
|
|
"SERVICE_START_PENDING",
|
|
"SERVICE_STOP_PENDING",
|
|
"SERVICE_STOPPED",
|
|
])),
|
|
])
|
|
|
|
|
|
class Process(_Observable):
|
|
|
|
_type = 'process'
|
|
_properties = OrderedDict()
|
|
_properties.update([
|
|
('type', TypeProperty(_type)),
|
|
('is_hidden', BooleanProperty()),
|
|
('pid', IntegerProperty()),
|
|
('name', StringProperty()),
|
|
# this is not the created timestamps of the object itself
|
|
('created', TimestampProperty()),
|
|
('cwd', StringProperty()),
|
|
('arguments', ListProperty(StringProperty)),
|
|
('command_line', StringProperty()),
|
|
('environment_variables', DictionaryProperty()),
|
|
('opened_connection_refs', ListProperty(ObjectReferenceProperty(valid_types='network-traffic'))),
|
|
('creator_user_ref', ObjectReferenceProperty(valid_types='user-account')),
|
|
('binary_ref', ObjectReferenceProperty(valid_types='file')),
|
|
('parent_ref', ObjectReferenceProperty(valid_types='process')),
|
|
('child_refs', ListProperty(ObjectReferenceProperty('process'))),
|
|
('extensions', ExtensionsProperty(enclosing_type=_type)),
|
|
])
|
|
|
|
def _check_object_constraints(self):
|
|
# no need to check windows-service-ext, since it has a required property
|
|
super(Process, self)._check_object_constraints()
|
|
try:
|
|
self._check_at_least_one_property()
|
|
if "windows-process-ext" in self.get('extensions', {}):
|
|
self.extensions["windows-process-ext"]._check_at_least_one_property()
|
|
except AtLeastOnePropertyError as enclosing_exc:
|
|
if 'extensions' not in self:
|
|
raise enclosing_exc
|
|
else:
|
|
if "windows-process-ext" in self.get('extensions', {}):
|
|
self.extensions["windows-process-ext"]._check_at_least_one_property()
|
|
|
|
|
|
class Software(_Observable):
|
|
|
|
_type = 'software'
|
|
_properties = OrderedDict()
|
|
_properties.update([
|
|
('type', TypeProperty(_type)),
|
|
('name', StringProperty(required=True)),
|
|
('cpe', StringProperty()),
|
|
('languages', ListProperty(StringProperty)),
|
|
('vendor', StringProperty()),
|
|
('version', StringProperty()),
|
|
('extensions', ExtensionsProperty(enclosing_type=_type)),
|
|
])
|
|
|
|
|
|
class URL(_Observable):
|
|
|
|
_type = 'url'
|
|
_properties = OrderedDict()
|
|
_properties.update([
|
|
('type', TypeProperty(_type)),
|
|
('value', StringProperty(required=True)),
|
|
('extensions', ExtensionsProperty(enclosing_type=_type)),
|
|
])
|
|
|
|
|
|
class UNIXAccountExt(_Extension):
|
|
|
|
_type = 'unix-account-ext'
|
|
_properties = OrderedDict()
|
|
_properties.update([
|
|
('gid', IntegerProperty()),
|
|
('groups', ListProperty(StringProperty)),
|
|
('home_dir', StringProperty()),
|
|
('shell', StringProperty()),
|
|
])
|
|
|
|
|
|
class UserAccount(_Observable):
|
|
|
|
_type = 'user-account'
|
|
_properties = OrderedDict()
|
|
_properties.update([
|
|
('type', TypeProperty(_type)),
|
|
('user_id', StringProperty(required=True)),
|
|
('account_login', StringProperty()),
|
|
('account_type', StringProperty()), # open vocab
|
|
('display_name', StringProperty()),
|
|
('is_service_account', BooleanProperty()),
|
|
('is_privileged', BooleanProperty()),
|
|
('can_escalate_privs', BooleanProperty()),
|
|
('is_disabled', BooleanProperty()),
|
|
('account_created', TimestampProperty()),
|
|
('account_expires', TimestampProperty()),
|
|
('password_last_changed', TimestampProperty()),
|
|
('account_first_login', TimestampProperty()),
|
|
('account_last_login', TimestampProperty()),
|
|
('extensions', ExtensionsProperty(enclosing_type=_type)),
|
|
])
|
|
|
|
|
|
class WindowsRegistryValueType(_STIXBase):
|
|
|
|
_type = 'windows-registry-value-type'
|
|
_properties = OrderedDict()
|
|
_properties.update([
|
|
('name', StringProperty(required=True)),
|
|
('data', StringProperty()),
|
|
('data_type', EnumProperty(allowed=[
|
|
'REG_NONE',
|
|
'REG_SZ',
|
|
'REG_EXPAND_SZ',
|
|
'REG_BINARY',
|
|
'REG_DWORD',
|
|
'REG_DWORD_BIG_ENDIAN',
|
|
'REG_LINK',
|
|
'REG_MULTI_SZ',
|
|
'REG_RESOURCE_LIST',
|
|
'REG_FULL_RESOURCE_DESCRIPTION',
|
|
'REG_RESOURCE_REQUIREMENTS_LIST',
|
|
'REG_QWORD',
|
|
'REG_INVALID_TYPE',
|
|
])),
|
|
])
|
|
|
|
|
|
class WindowsRegistryKey(_Observable):
|
|
|
|
_type = 'windows-registry-key'
|
|
_properties = OrderedDict()
|
|
_properties.update([
|
|
('type', TypeProperty(_type)),
|
|
('key', StringProperty(required=True)),
|
|
('values', ListProperty(EmbeddedObjectProperty(type=WindowsRegistryValueType))),
|
|
# this is not the modified timestamps of the object itself
|
|
('modified', TimestampProperty()),
|
|
('creator_user_ref', ObjectReferenceProperty(valid_types='user-account')),
|
|
('number_of_subkeys', IntegerProperty()),
|
|
('extensions', ExtensionsProperty(enclosing_type=_type)),
|
|
])
|
|
|
|
@property
|
|
def values(self):
|
|
# Needed because 'values' is a property on collections.Mapping objects
|
|
return self._inner['values']
|
|
|
|
|
|
class X509V3ExtenstionsType(_STIXBase):
|
|
|
|
_type = 'x509-v3-extensions-type'
|
|
_properties = OrderedDict()
|
|
_properties.update([
|
|
('basic_constraints', StringProperty()),
|
|
('name_constraints', StringProperty()),
|
|
('policy_constraints', StringProperty()),
|
|
('key_usage', StringProperty()),
|
|
('extended_key_usage', StringProperty()),
|
|
('subject_key_identifier', StringProperty()),
|
|
('authority_key_identifier', StringProperty()),
|
|
('subject_alternative_name', StringProperty()),
|
|
('issuer_alternative_name', StringProperty()),
|
|
('subject_directory_attributes', StringProperty()),
|
|
('crl_distribution_points', StringProperty()),
|
|
('inhibit_any_policy', StringProperty()),
|
|
('private_key_usage_period_not_before', TimestampProperty()),
|
|
('private_key_usage_period_not_after', TimestampProperty()),
|
|
('certificate_policies', StringProperty()),
|
|
('policy_mappings', StringProperty()),
|
|
])
|
|
|
|
|
|
class X509Certificate(_Observable):
|
|
|
|
_type = 'x509-certificate'
|
|
_properties = OrderedDict()
|
|
_properties.update([
|
|
('type', TypeProperty(_type)),
|
|
('is_self_signed', BooleanProperty()),
|
|
('hashes', HashesProperty()),
|
|
('version', StringProperty()),
|
|
('serial_number', StringProperty()),
|
|
('signature_algorithm', StringProperty()),
|
|
('issuer', StringProperty()),
|
|
('validity_not_before', TimestampProperty()),
|
|
('validity_not_after', TimestampProperty()),
|
|
('subject', StringProperty()),
|
|
('subject_public_key_algorithm', StringProperty()),
|
|
('subject_public_key_modulus', StringProperty()),
|
|
('subject_public_key_exponent', IntegerProperty()),
|
|
('x509_v3_extensions', EmbeddedObjectProperty(type=X509V3ExtenstionsType)),
|
|
('extensions', ExtensionsProperty(enclosing_type=_type)),
|
|
])
|
|
|
|
|
|
OBJ_MAP_OBSERVABLE = {
|
|
'artifact': Artifact,
|
|
'autonomous-system': AutonomousSystem,
|
|
'directory': Directory,
|
|
'domain-name': DomainName,
|
|
'email-addr': EmailAddress,
|
|
'email-message': EmailMessage,
|
|
'file': File,
|
|
'ipv4-addr': IPv4Address,
|
|
'ipv6-addr': IPv6Address,
|
|
'mac-addr': MACAddress,
|
|
'mutex': Mutex,
|
|
'network-traffic': NetworkTraffic,
|
|
'process': Process,
|
|
'software': Software,
|
|
'url': URL,
|
|
'user-account': UserAccount,
|
|
'windows-registry-key': WindowsRegistryKey,
|
|
'x509-certificate': X509Certificate,
|
|
}
|
|
|
|
|
|
EXT_MAP = {
|
|
'file': {
|
|
'archive-ext': ArchiveExt,
|
|
'ntfs-ext': NTFSExt,
|
|
'pdf-ext': PDFExt,
|
|
'raster-image-ext': RasterImageExt,
|
|
'windows-pebinary-ext': WindowsPEBinaryExt
|
|
},
|
|
'network-traffic': {
|
|
'http-request-ext': HTTPRequestExt,
|
|
'icmp-ext': ICMPExt,
|
|
'socket-ext': SocketExt,
|
|
'tcp-ext': TCPExt,
|
|
},
|
|
'process': {
|
|
'windows-process-ext': WindowsProcessExt,
|
|
'windows-service-ext': WindowsServiceExt,
|
|
},
|
|
'user-account': {
|
|
'unix-account-ext': UNIXAccountExt,
|
|
},
|
|
}
|
|
|
|
|
|
def parse_observable(data, _valid_refs=None, allow_custom=False):
|
|
"""Deserialize a string or file-like object into a STIX Cyber Observable
|
|
object.
|
|
|
|
Args:
|
|
data: The STIX 2 string to be parsed.
|
|
_valid_refs: A list of object references valid for the scope of the
|
|
object being parsed. Use empty list if no valid refs are present.
|
|
allow_custom: Whether to allow custom properties or not.
|
|
Default: False.
|
|
|
|
Returns:
|
|
An instantiated Python STIX Cyber Observable object.
|
|
"""
|
|
|
|
obj = get_dict(data)
|
|
obj['_valid_refs'] = _valid_refs or []
|
|
|
|
if 'type' not in obj:
|
|
raise ParseError("Can't parse observable with no 'type' property: %s" % str(obj))
|
|
try:
|
|
obj_class = OBJ_MAP_OBSERVABLE[obj['type']]
|
|
except KeyError:
|
|
raise ParseError("Can't parse unknown observable type '%s'! For custom observables, "
|
|
"use the CustomObservable decorator." % obj['type'])
|
|
|
|
if 'extensions' in obj and obj['type'] in EXT_MAP:
|
|
for name, ext in obj['extensions'].items():
|
|
if name not in EXT_MAP[obj['type']]:
|
|
raise ParseError("Can't parse Unknown extension type '%s' for observable type '%s'!" % (name, obj['type']))
|
|
ext_class = EXT_MAP[obj['type']][name]
|
|
obj['extensions'][name] = ext_class(allow_custom=allow_custom, **obj['extensions'][name])
|
|
|
|
return obj_class(allow_custom=allow_custom, **obj)
|
|
|
|
|
|
def _register_observable(new_observable):
|
|
"""Register a custom STIX Cyber Observable type.
|
|
"""
|
|
|
|
OBJ_MAP_OBSERVABLE[new_observable._type] = new_observable
|
|
|
|
|
|
def CustomObservable(type='x-custom-observable', properties=None):
|
|
"""Custom STIX Cyber Observable Object type decorator.
|
|
|
|
Example:
|
|
>>> @CustomObservable('x-custom-observable', [
|
|
... ('property1', StringProperty(required=True)),
|
|
... ('property2', IntegerProperty()),
|
|
... ])
|
|
... class MyNewObservableType():
|
|
... pass
|
|
"""
|
|
|
|
def custom_builder(cls):
|
|
|
|
class _Custom(cls, _Observable):
|
|
|
|
_type = type
|
|
_properties = OrderedDict()
|
|
_properties.update([
|
|
('type', TypeProperty(_type)),
|
|
])
|
|
|
|
if not properties or not isinstance(properties, list):
|
|
raise ValueError("Must supply a list, containing tuples. For example, [('property1', IntegerProperty())]")
|
|
|
|
# Check properties ending in "_ref/s" are ObjectReferenceProperties
|
|
for prop_name, prop in properties:
|
|
if prop_name.endswith('_ref') and not isinstance(prop, ObjectReferenceProperty):
|
|
raise ValueError("'%s' is named like an object reference property but "
|
|
"is not an ObjectReferenceProperty." % prop_name)
|
|
elif (prop_name.endswith('_refs') and (not isinstance(prop, ListProperty)
|
|
or not isinstance(prop.contained, ObjectReferenceProperty))):
|
|
raise ValueError("'%s' is named like an object reference list property but "
|
|
"is not a ListProperty containing ObjectReferenceProperty." % prop_name)
|
|
|
|
_properties.update(properties)
|
|
|
|
def __init__(self, **kwargs):
|
|
_Observable.__init__(self, **kwargs)
|
|
try:
|
|
cls.__init__(self, **kwargs)
|
|
except (AttributeError, TypeError) as e:
|
|
# Don't accidentally catch errors raised in a custom __init__()
|
|
if ("has no attribute '__init__'" in str(e) or
|
|
str(e) == "object.__init__() takes no parameters"):
|
|
return
|
|
raise e
|
|
|
|
_register_observable(_Custom)
|
|
return _Custom
|
|
|
|
return custom_builder
|
|
|
|
|
|
def _register_extension(observable, new_extension):
|
|
"""Register a custom extension to a STIX Cyber Observable type.
|
|
"""
|
|
|
|
try:
|
|
observable_type = observable._type
|
|
except AttributeError:
|
|
raise ValueError("Unknown observable type. Custom observables must be "
|
|
"created with the @CustomObservable decorator.")
|
|
|
|
try:
|
|
EXT_MAP[observable_type][new_extension._type] = new_extension
|
|
except KeyError:
|
|
if observable_type not in OBJ_MAP_OBSERVABLE:
|
|
raise ValueError("Unknown observable type '%s'. Custom observables "
|
|
"must be created with the @CustomObservable decorator."
|
|
% observable_type)
|
|
else:
|
|
EXT_MAP[observable_type] = {new_extension._type: new_extension}
|
|
|
|
|
|
def CustomExtension(observable=None, type='x-custom-observable', properties=None):
|
|
"""Decorator for custom extensions to STIX Cyber Observables.
|
|
"""
|
|
|
|
if not observable or not issubclass(observable, _Observable):
|
|
raise ValueError("'observable' must be a valid Observable class!")
|
|
|
|
def custom_builder(cls):
|
|
|
|
class _Custom(cls, _Extension):
|
|
|
|
_type = type
|
|
_properties = {
|
|
'extensions': ExtensionsProperty(enclosing_type=_type),
|
|
}
|
|
|
|
if not isinstance(properties, dict) or not properties:
|
|
raise ValueError("'properties' must be a dict!")
|
|
|
|
_properties.update(properties)
|
|
|
|
def __init__(self, **kwargs):
|
|
_Extension.__init__(self, **kwargs)
|
|
try:
|
|
cls.__init__(self, **kwargs)
|
|
except (AttributeError, TypeError) as e:
|
|
# Don't accidentally catch errors raised in a custom __init__()
|
|
if ("has no attribute '__init__'" in str(e) or
|
|
str(e) == "object.__init__() takes no parameters"):
|
|
return
|
|
raise e
|
|
|
|
_register_extension(observable, _Custom)
|
|
return _Custom
|
|
|
|
return custom_builder
|