555 lines
18 KiB
Python
555 lines
18 KiB
Python
import os
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import pytest
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import stix2
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import stix2.equivalence.graph
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import stix2.equivalence.object
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from .constants import (
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CAMPAIGN_ID, CAMPAIGN_KWARGS, FAKE_TIME, IDENTITY_ID, IDENTITY_KWARGS,
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INDICATOR_ID, INDICATOR_KWARGS, MALWARE_ID, MALWARE_KWARGS,
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RELATIONSHIP_IDS,
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)
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FS_PATH = os.path.join(os.path.dirname(os.path.realpath(__file__)), "stix2_data")
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@pytest.fixture
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def ds():
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cam = stix2.v20.Campaign(id=CAMPAIGN_ID, **CAMPAIGN_KWARGS)
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idy = stix2.v20.Identity(id=IDENTITY_ID, **IDENTITY_KWARGS)
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ind = stix2.v20.Indicator(id=INDICATOR_ID, **INDICATOR_KWARGS)
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mal = stix2.v20.Malware(id=MALWARE_ID, **MALWARE_KWARGS)
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rel1 = stix2.v20.Relationship(ind, 'indicates', mal, id=RELATIONSHIP_IDS[0])
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rel2 = stix2.v20.Relationship(mal, 'targets', idy, id=RELATIONSHIP_IDS[1])
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rel3 = stix2.v20.Relationship(cam, 'uses', mal, id=RELATIONSHIP_IDS[2])
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reprt = stix2.v20.Report(
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name="Malware Report",
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published="2021-05-09T08:22:22Z",
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labels=["campaign"],
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object_refs=[mal.id, rel1.id, ind.id],
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)
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stix_objs = [cam, idy, ind, mal, rel1, rel2, rel3, reprt]
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yield stix2.MemoryStore(stix_objs)
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@pytest.fixture
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def ds2():
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cam = stix2.v20.Campaign(id=CAMPAIGN_ID, **CAMPAIGN_KWARGS)
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idy = stix2.v20.Identity(id=IDENTITY_ID, **IDENTITY_KWARGS)
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ind = stix2.v20.Indicator(id=INDICATOR_ID, created_by_ref=idy.id, **INDICATOR_KWARGS)
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indv2 = ind.new_version(external_references=[{
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"source_name": "unknown",
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"url": "https://examplewebsite.com/",
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}])
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mal = stix2.v20.Malware(id=MALWARE_ID, created_by_ref=idy.id, **MALWARE_KWARGS)
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malv2 = mal.new_version(external_references=[{
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"source_name": "unknown",
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"url": "https://examplewebsite2.com/",
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}])
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rel1 = stix2.v20.Relationship(ind, 'indicates', mal, id=RELATIONSHIP_IDS[0])
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rel2 = stix2.v20.Relationship(mal, 'targets', idy, id=RELATIONSHIP_IDS[1])
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rel3 = stix2.v20.Relationship(cam, 'uses', mal, id=RELATIONSHIP_IDS[2])
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stix_objs = [cam, idy, ind, indv2, mal, malv2, rel1, rel2, rel3]
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reprt = stix2.v20.Report(
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created_by_ref=idy.id,
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name="example",
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labels=["campaign"],
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published="2021-04-09T08:22:22Z",
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object_refs=stix_objs,
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)
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stix_objs.append(reprt)
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yield stix2.MemoryStore(stix_objs)
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def test_object_factory_created_by_ref_str():
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factory = stix2.ObjectFactory(created_by_ref=IDENTITY_ID)
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ind = factory.create(stix2.v20.Indicator, **INDICATOR_KWARGS)
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assert ind.created_by_ref == IDENTITY_ID
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def test_object_factory_created_by_ref_obj():
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id_obj = stix2.v20.Identity(id=IDENTITY_ID, **IDENTITY_KWARGS)
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factory = stix2.ObjectFactory(created_by_ref=id_obj)
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ind = factory.create(stix2.v20.Indicator, **INDICATOR_KWARGS)
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assert ind.created_by_ref == IDENTITY_ID
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def test_object_factory_override_default():
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factory = stix2.ObjectFactory(created_by_ref=IDENTITY_ID)
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new_id = "identity--983b3172-44fe-4a80-8091-eb8098841fe8"
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ind = factory.create(stix2.v20.Indicator, created_by_ref=new_id, **INDICATOR_KWARGS)
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assert ind.created_by_ref == new_id
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def test_object_factory_created():
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factory = stix2.ObjectFactory(created=FAKE_TIME)
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ind = factory.create(stix2.v20.Indicator, **INDICATOR_KWARGS)
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assert ind.created == FAKE_TIME
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assert ind.modified == FAKE_TIME
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def test_object_factory_external_reference():
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ext_ref = stix2.v20.ExternalReference(
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source_name="ACME Threat Intel",
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description="Threat report",
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)
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factory = stix2.ObjectFactory(external_references=ext_ref)
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ind = factory.create(stix2.v20.Indicator, **INDICATOR_KWARGS)
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assert ind.external_references[0].source_name == "ACME Threat Intel"
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assert ind.external_references[0].description == "Threat report"
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ind2 = factory.create(stix2.v20.Indicator, external_references=None, **INDICATOR_KWARGS)
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assert 'external_references' not in ind2
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def test_object_factory_obj_markings():
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stmt_marking = stix2.v20.StatementMarking("Copyright 2016, Example Corp")
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mark_def = stix2.v20.MarkingDefinition(
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definition_type="statement",
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definition=stmt_marking,
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)
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factory = stix2.ObjectFactory(object_marking_refs=[mark_def, stix2.v20.TLP_AMBER])
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ind = factory.create(stix2.v20.Indicator, **INDICATOR_KWARGS)
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assert mark_def.id in ind.object_marking_refs
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assert stix2.v20.TLP_AMBER.id in ind.object_marking_refs
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factory = stix2.ObjectFactory(object_marking_refs=stix2.v20.TLP_RED)
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ind = factory.create(stix2.v20.Indicator, **INDICATOR_KWARGS)
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assert stix2.v20.TLP_RED.id in ind.object_marking_refs
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def test_object_factory_list_append():
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ext_ref = stix2.v20.ExternalReference(
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source_name="ACME Threat Intel",
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description="Threat report from ACME",
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)
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ext_ref2 = stix2.v20.ExternalReference(
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source_name="Yet Another Threat Report",
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description="Threat report from YATR",
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)
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ext_ref3 = stix2.v20.ExternalReference(
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source_name="Threat Report #3",
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description="One more threat report",
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)
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factory = stix2.ObjectFactory(external_references=ext_ref)
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ind = factory.create(stix2.v20.Indicator, external_references=ext_ref2, **INDICATOR_KWARGS)
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assert ind.external_references[1].source_name == "Yet Another Threat Report"
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ind = factory.create(stix2.v20.Indicator, external_references=[ext_ref2, ext_ref3], **INDICATOR_KWARGS)
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assert ind.external_references[2].source_name == "Threat Report #3"
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def test_object_factory_list_replace():
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ext_ref = stix2.v20.ExternalReference(
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source_name="ACME Threat Intel",
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description="Threat report from ACME",
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)
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ext_ref2 = stix2.v20.ExternalReference(
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source_name="Yet Another Threat Report",
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description="Threat report from YATR",
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)
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factory = stix2.ObjectFactory(external_references=ext_ref, list_append=False)
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ind = factory.create(stix2.v20.Indicator, external_references=ext_ref2, **INDICATOR_KWARGS)
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assert len(ind.external_references) == 1
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assert ind.external_references[0].source_name == "Yet Another Threat Report"
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def test_environment_functions():
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env = stix2.Environment(
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stix2.ObjectFactory(created_by_ref=IDENTITY_ID),
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stix2.MemoryStore(),
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)
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# Create a STIX object
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ind = env.create(stix2.v20.Indicator, id=INDICATOR_ID, **INDICATOR_KWARGS)
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assert ind.created_by_ref == IDENTITY_ID
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# Add objects to datastore
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ind2 = ind.new_version(labels=['benign'])
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env.add([ind, ind2])
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# Get both versions of the object
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resp = env.all_versions(INDICATOR_ID)
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assert len(resp) == 2
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# Get just the most recent version of the object
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resp = env.get(INDICATOR_ID)
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assert resp['labels'][0] == 'benign'
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# Search on something other than id
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query = [stix2.Filter('type', '=', 'vulnerability')]
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resp = env.query(query)
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assert len(resp) == 0
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# See different results after adding filters to the environment
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env.add_filters([
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stix2.Filter('type', '=', 'indicator'),
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stix2.Filter('created_by_ref', '=', IDENTITY_ID),
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])
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env.add_filter(stix2.Filter('labels', '=', 'benign')) # should be 'malicious-activity'
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resp = env.get(INDICATOR_ID)
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assert resp['labels'][0] == 'benign' # should be 'malicious-activity'
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def test_environment_source_and_sink():
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ind = stix2.v20.Indicator(id=INDICATOR_ID, **INDICATOR_KWARGS)
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env = stix2.Environment(source=stix2.MemorySource([ind]), sink=stix2.MemorySink([ind]))
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assert env.get(INDICATOR_ID).labels[0] == 'malicious-activity'
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def test_environment_datastore_and_sink():
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with pytest.raises(ValueError) as excinfo:
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stix2.Environment(
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factory=stix2.ObjectFactory(),
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store=stix2.MemoryStore(), sink=stix2.MemorySink,
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)
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assert 'Data store already provided' in str(excinfo.value)
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def test_environment_no_datastore():
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env = stix2.Environment(factory=stix2.ObjectFactory())
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with pytest.raises(AttributeError) as excinfo:
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env.add(stix2.v20.Indicator(**INDICATOR_KWARGS))
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assert 'Environment has no data sink to put objects in' in str(excinfo.value)
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with pytest.raises(AttributeError) as excinfo:
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env.get(INDICATOR_ID)
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assert 'Environment has no data source' in str(excinfo.value)
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with pytest.raises(AttributeError) as excinfo:
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env.all_versions(INDICATOR_ID)
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assert 'Environment has no data source' in str(excinfo.value)
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with pytest.raises(AttributeError) as excinfo:
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env.query(INDICATOR_ID)
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assert 'Environment has no data source' in str(excinfo.value)
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with pytest.raises(AttributeError) as excinfo:
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env.relationships(INDICATOR_ID)
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assert 'Environment has no data source' in str(excinfo.value)
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with pytest.raises(AttributeError) as excinfo:
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env.related_to(INDICATOR_ID)
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assert 'Environment has no data source' in str(excinfo.value)
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def test_environment_add_filters():
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env = stix2.Environment(factory=stix2.ObjectFactory())
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env.add_filters([INDICATOR_ID])
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env.add_filter(INDICATOR_ID)
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def test_environment_datastore_and_no_object_factory():
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# Uses a default object factory
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env = stix2.Environment(store=stix2.MemoryStore())
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ind = env.create(stix2.v20.Indicator, id=INDICATOR_ID, **INDICATOR_KWARGS)
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assert ind.id == INDICATOR_ID
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def test_parse_malware():
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env = stix2.Environment()
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data = """{
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"type": "malware",
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"id": "malware--9c4638ec-f1de-4ddb-abf4-1b760417654e",
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"created": "2017-01-01T12:34:56.000Z",
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"modified": "2017-01-01T12:34:56.000Z",
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"name": "Cryptolocker",
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"labels": [
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"ransomware"
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]
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}"""
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mal = env.parse(data, version="2.0")
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assert mal.type == 'malware'
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assert mal.id == MALWARE_ID
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assert mal.created == FAKE_TIME
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assert mal.modified == FAKE_TIME
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assert mal.labels == ['ransomware']
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assert mal.name == "Cryptolocker"
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def test_creator_of():
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identity = stix2.v20.Identity(**IDENTITY_KWARGS)
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factory = stix2.ObjectFactory(created_by_ref=identity.id)
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env = stix2.Environment(store=stix2.MemoryStore(), factory=factory)
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env.add(identity)
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ind = env.create(stix2.v20.Indicator, **INDICATOR_KWARGS)
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creator = env.creator_of(ind)
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assert creator is identity
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def test_creator_of_no_datasource():
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identity = stix2.v20.Identity(**IDENTITY_KWARGS)
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factory = stix2.ObjectFactory(created_by_ref=identity.id)
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env = stix2.Environment(factory=factory)
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ind = env.create(stix2.v20.Indicator, **INDICATOR_KWARGS)
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with pytest.raises(AttributeError) as excinfo:
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env.creator_of(ind)
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assert 'Environment has no data source' in str(excinfo.value)
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def test_creator_of_not_found():
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identity = stix2.v20.Identity(**IDENTITY_KWARGS)
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factory = stix2.ObjectFactory(created_by_ref=identity.id)
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env = stix2.Environment(store=stix2.MemoryStore(), factory=factory)
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ind = env.create(stix2.v20.Indicator, **INDICATOR_KWARGS)
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creator = env.creator_of(ind)
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assert creator is None
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def test_creator_of_no_created_by_ref():
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env = stix2.Environment(store=stix2.MemoryStore())
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ind = env.create(stix2.v20.Indicator, **INDICATOR_KWARGS)
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creator = env.creator_of(ind)
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assert creator is None
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def test_relationships(ds):
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env = stix2.Environment(store=ds)
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mal = env.get(MALWARE_ID)
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resp = env.relationships(mal)
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assert len(resp) == 3
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assert any(x['id'] == RELATIONSHIP_IDS[0] for x in resp)
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assert any(x['id'] == RELATIONSHIP_IDS[1] for x in resp)
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assert any(x['id'] == RELATIONSHIP_IDS[2] for x in resp)
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def test_relationships_no_id(ds):
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env = stix2.Environment(store=ds)
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mal = {
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"type": "malware",
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"name": "some variant",
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}
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with pytest.raises(ValueError) as excinfo:
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env.relationships(mal)
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assert "object has no 'id' property" in str(excinfo.value)
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def test_relationships_by_type(ds):
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env = stix2.Environment(store=ds)
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mal = env.get(MALWARE_ID)
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resp = env.relationships(mal, relationship_type='indicates')
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assert len(resp) == 1
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assert resp[0]['id'] == RELATIONSHIP_IDS[0]
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def test_relationships_by_source(ds):
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env = stix2.Environment(store=ds)
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resp = env.relationships(MALWARE_ID, source_only=True)
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assert len(resp) == 1
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assert resp[0]['id'] == RELATIONSHIP_IDS[1]
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def test_relationships_by_target(ds):
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env = stix2.Environment(store=ds)
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resp = env.relationships(MALWARE_ID, target_only=True)
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assert len(resp) == 2
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assert any(x['id'] == RELATIONSHIP_IDS[0] for x in resp)
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assert any(x['id'] == RELATIONSHIP_IDS[2] for x in resp)
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def test_relationships_by_target_and_type(ds):
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env = stix2.Environment(store=ds)
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resp = env.relationships(MALWARE_ID, relationship_type='uses', target_only=True)
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assert len(resp) == 1
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assert any(x['id'] == RELATIONSHIP_IDS[2] for x in resp)
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def test_relationships_by_target_and_source(ds):
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env = stix2.Environment(store=ds)
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with pytest.raises(ValueError) as excinfo:
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env.relationships(MALWARE_ID, target_only=True, source_only=True)
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assert 'not both' in str(excinfo.value)
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def test_related_to(ds):
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env = stix2.Environment(store=ds)
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mal = env.get(MALWARE_ID)
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resp = env.related_to(mal)
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assert len(resp) == 3
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assert any(x['id'] == CAMPAIGN_ID for x in resp)
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assert any(x['id'] == INDICATOR_ID for x in resp)
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assert any(x['id'] == IDENTITY_ID for x in resp)
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def test_related_to_no_id(ds):
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env = stix2.Environment(store=ds)
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mal = {
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"type": "malware",
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"name": "some variant",
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}
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with pytest.raises(ValueError) as excinfo:
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env.related_to(mal)
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assert "object has no 'id' property" in str(excinfo.value)
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def test_related_to_by_source(ds):
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env = stix2.Environment(store=ds)
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resp = env.related_to(MALWARE_ID, source_only=True)
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assert len(resp) == 1
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assert resp[0]['id'] == IDENTITY_ID
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def test_related_to_by_target(ds):
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env = stix2.Environment(store=ds)
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resp = env.related_to(MALWARE_ID, target_only=True)
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assert len(resp) == 2
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assert any(x['id'] == CAMPAIGN_ID for x in resp)
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assert any(x['id'] == INDICATOR_ID for x in resp)
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def test_versioned_checks(ds, ds2):
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weights = stix2.equivalence.graph.GRAPH_WEIGHTS.copy()
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weights.update({
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"_internal": {
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"ignore_spec_version": True,
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"versioning_checks": True,
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"max_depth": 1,
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},
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})
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score = stix2.equivalence.object._versioned_checks(INDICATOR_ID, INDICATOR_ID, ds, ds2, **weights)
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assert round(score) == 100
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def test_semantic_check_with_versioning(ds, ds2):
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weights = stix2.equivalence.graph.GRAPH_WEIGHTS.copy()
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weights.update({
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"_internal": {
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"ignore_spec_version": False,
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"versioning_checks": True,
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"ds1": ds,
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"ds2": ds2,
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"max_depth": 1,
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},
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})
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ind = stix2.v20.Indicator(
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**dict(
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labels=["malicious-activity"],
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pattern="[file:hashes.'SHA-256' = 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855']",
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valid_from="2017-01-01T12:34:56Z",
|
|
external_references=[
|
|
{
|
|
"source_name": "unknown",
|
|
"url": "https://examplewebsite2.com/",
|
|
},
|
|
],
|
|
object_marking_refs=[stix2.v20.TLP_WHITE],
|
|
)
|
|
)
|
|
ds.add(ind)
|
|
score = stix2.equivalence.object.reference_check(ind.id, INDICATOR_ID, ds, ds2, **weights)
|
|
assert round(score) == 0 # Since pattern is different score is really low
|
|
|
|
|
|
def test_list_semantic_check(ds, ds2):
|
|
weights = stix2.equivalence.graph.GRAPH_WEIGHTS.copy()
|
|
weights.update({
|
|
"_internal": {
|
|
"ignore_spec_version": False,
|
|
"versioning_checks": False,
|
|
"ds1": ds,
|
|
"ds2": ds2,
|
|
"max_depth": 1,
|
|
},
|
|
})
|
|
object_refs1 = [
|
|
"malware--9c4638ec-f1de-4ddb-abf4-1b760417654e",
|
|
"relationship--06520621-5352-4e6a-b976-e8fa3d437ffd",
|
|
"indicator--a740531e-63ff-4e49-a9e1-a0a3eed0e3e7",
|
|
]
|
|
object_refs2 = [
|
|
"campaign--8e2e2d2b-17d4-4cbf-938f-98ee46b3cd3f",
|
|
"identity--311b2d2d-f010-4473-83ec-1edf84858f4c",
|
|
"indicator--a740531e-63ff-4e49-a9e1-a0a3eed0e3e7",
|
|
"malware--9c4638ec-f1de-4ddb-abf4-1b760417654e",
|
|
"malware--9c4638ec-f1de-4ddb-abf4-1b760417654e",
|
|
"relationship--06520621-5352-4e6a-b976-e8fa3d437ffd",
|
|
"relationship--181c9c09-43e6-45dd-9374-3bec192f05ef",
|
|
"relationship--a0cbb21c-8daf-4a7f-96aa-7155a4ef8f70",
|
|
]
|
|
|
|
score = stix2.equivalence.object.list_reference_check(
|
|
object_refs1,
|
|
object_refs2,
|
|
ds,
|
|
ds2,
|
|
**weights,
|
|
)
|
|
assert round(score) == 1
|
|
|
|
|
|
def test_graph_equivalence_with_filesystem_source(ds):
|
|
weights = {
|
|
"_internal": {
|
|
"ignore_spec_version": True,
|
|
"versioning_checks": False,
|
|
"max_depth": 1,
|
|
},
|
|
}
|
|
prop_scores = {}
|
|
fs = stix2.FileSystemSource(FS_PATH)
|
|
env = stix2.Environment().graphically_equivalent(fs, ds, prop_scores, **weights)
|
|
assert round(env) == 28
|
|
assert round(prop_scores["matching_score"]) == 139
|
|
assert round(prop_scores["sum_weights"]) == 500
|
|
|
|
|
|
def test_graph_equivalence_with_duplicate_graph(ds):
|
|
weights = {
|
|
"_internal": {
|
|
"ignore_spec_version": False,
|
|
"versioning_checks": False,
|
|
"max_depth": 1,
|
|
},
|
|
}
|
|
prop_scores = {}
|
|
env = stix2.Environment().graphically_equivalent(ds, ds, prop_scores, **weights)
|
|
assert round(env) == 100
|
|
assert round(prop_scores["matching_score"]) == 800
|
|
assert round(prop_scores["sum_weights"]) == 800
|
|
|
|
|
|
def test_graph_equivalence_with_versioning_check_on(ds2, ds):
|
|
weights = {
|
|
"_internal": {
|
|
"ignore_spec_version": False,
|
|
"versioning_checks": True,
|
|
"max_depth": 1,
|
|
},
|
|
}
|
|
prop_scores = {}
|
|
env = stix2.Environment().graphically_equivalent(ds, ds2, prop_scores, **weights)
|
|
assert round(env) == 93
|
|
assert round(prop_scores["matching_score"]) == 745
|
|
assert round(prop_scores["sum_weights"]) == 800
|
|
|
|
|
|
def test_graph_equivalence_with_versioning_check_off(ds2, ds):
|
|
weights = {
|
|
"_internal": {
|
|
"ignore_spec_version": False,
|
|
"versioning_checks": False,
|
|
"max_depth": 1,
|
|
},
|
|
}
|
|
prop_scores = {}
|
|
env = stix2.Environment().graphically_equivalent(ds, ds2, prop_scores, **weights)
|
|
assert round(env) == 93
|
|
assert round(prop_scores["matching_score"]) == 745
|
|
assert round(prop_scores["sum_weights"]) == 800
|