274 lines
9.7 KiB
Python
274 lines
9.7 KiB
Python
"""
|
|
Python STIX 2.0 Memory Source/Sink
|
|
|
|
Classes:
|
|
MemoryStore
|
|
MemorySink
|
|
MemorySource
|
|
|
|
TODO: Test everything.
|
|
|
|
TODO: Use deduplicate() calls only when memory corpus is dirty (been added to)
|
|
can save a lot of time for successive queries
|
|
|
|
NOTE: Not worrying about STIX versioning. The in memory STIX data at anytime
|
|
will only hold one version of a STIX object. As such, when save() is called,
|
|
the single versions of all the STIX objects are what is written to file.
|
|
|
|
"""
|
|
|
|
import json
|
|
import os
|
|
|
|
from stix2 import Bundle
|
|
from stix2.sources import DataSink, DataSource, DataStore, make_id
|
|
from stix2validator import validate_string
|
|
|
|
|
|
class MemoryStore(DataStore):
|
|
"""
|
|
"""
|
|
def __init__(self, stix_data=None, name="MemoryStore"):
|
|
"""
|
|
Note: It doesnt make sense to create a MemoryStore by passing
|
|
in existing MemorySource and MemorySink because there could
|
|
be data concurrency issues. Just as easy to create new MemoryStore.
|
|
"""
|
|
self.name = name
|
|
self.id = make_id()
|
|
self.data = {}
|
|
|
|
if stix_data:
|
|
if type(stix_data) == dict:
|
|
# stix objects are in a bundle
|
|
# verify STIX json data
|
|
r = validate_string(json.dumps(stix_data))
|
|
# make dictionary of the objects for easy lookup
|
|
if r.is_valid:
|
|
for stix_obj in stix_data["objects"]:
|
|
|
|
self.data[stix_obj["id"]] = stix_obj
|
|
else:
|
|
print("Error: json data passed to MemorySink() was found to not be validated by STIX 2 Validator")
|
|
print(r)
|
|
elif type(stix_data) == list:
|
|
# stix objects are in a list
|
|
for stix_obj in stix_data:
|
|
r = validate_string(json.dumps(stix_obj))
|
|
if r.is_valid:
|
|
self.data[stix_obj["id"]] = stix_obj
|
|
else:
|
|
print("Error: STIX object %s is not valid under STIX 2 validator.") % stix_obj["id"]
|
|
print(r)
|
|
|
|
self.source = MemorySource(stix_data=self.data, _store=True)
|
|
self.sink = MemorySink(stix_data=self.data, _store=True)
|
|
|
|
def save_to_file(self, file_path):
|
|
return self.sink.save_to_file(file_path=file_path)
|
|
|
|
def load_from_file(self, file_path):
|
|
return self.source.load_from_file(file_path=file_path)
|
|
|
|
|
|
class MemorySink(DataSink):
|
|
"""
|
|
|
|
"""
|
|
def __init__(self, stix_data=None, name="MemorySink", _store=False):
|
|
"""
|
|
Args:
|
|
|
|
data (dictionary OR list): valid STIX 2.0 content in bundle or a list
|
|
name (string): optional name tag of the data source
|
|
_store (bool): if the MemorySink is a part of a DataStore, in which case
|
|
"stix_data" is a direct reference to shared memory with DataSource
|
|
|
|
"""
|
|
super(MemorySink, self).__init__(name=name)
|
|
|
|
if _store:
|
|
self.data = stix_data
|
|
else:
|
|
self.data = {}
|
|
if stix_data:
|
|
if type(stix_data) == dict:
|
|
# stix objects are in a bundle
|
|
# verify STIX json data
|
|
r = validate_string(json.dumps(stix_data))
|
|
# make dictionary of the objects for easy lookup
|
|
if r.is_valid:
|
|
for stix_obj in stix_data["objects"]:
|
|
|
|
self.data[stix_obj["id"]] = stix_obj
|
|
else:
|
|
print("Error: json data passed to MemorySink() was found to not be validated by STIX 2 Validator")
|
|
print(r)
|
|
self.data = {}
|
|
elif type(stix_data) == list:
|
|
# stix objects are in a list
|
|
for stix_obj in stix_data:
|
|
r = validate_string(json.dumps(stix_obj))
|
|
if r.is_valid:
|
|
self.data[stix_obj["id"]] = stix_obj
|
|
else:
|
|
print("Error: STIX object %s is not valid under STIX 2 validator.") % stix_obj["id"]
|
|
print(r)
|
|
else:
|
|
raise ValueError("stix_data must be in bundle format or raw list")
|
|
|
|
def add(self, stix_data):
|
|
"""
|
|
"""
|
|
if type(stix_data) == dict:
|
|
# stix data is in bundle
|
|
r = validate_string(json.dumps(stix_data))
|
|
if r.is_valid:
|
|
for stix_obj in stix_data["objects"]:
|
|
self.data[stix_obj["id"]] = stix_obj
|
|
else:
|
|
print("Error: json data passed to MemorySink() was found to not be validated by STIX 2 Validator")
|
|
print(r)
|
|
elif type(stix_data) == list:
|
|
# stix data is in list
|
|
for stix_obj in stix_data:
|
|
r = validate_string(json.dumps(stix_obj))
|
|
if r.is_valid:
|
|
self.data[stix_obj["id"]] = stix_obj
|
|
else:
|
|
print("Error: STIX object %s is not valid under STIX 2 validator.") % stix_obj["id"]
|
|
print(r)
|
|
else:
|
|
raise ValueError("stix_data must be in bundle format or raw list")
|
|
|
|
def save_to_file(self, file_path):
|
|
"""
|
|
"""
|
|
json.dump(Bundle(self.data.values()), file_path, indent=4)
|
|
|
|
|
|
class MemorySource(DataSource):
|
|
|
|
def __init__(self, stix_data=None, name="MemorySource", _store=False):
|
|
"""
|
|
Args:
|
|
|
|
data (dictionary OR list): valid STIX 2.0 content in bundle or list
|
|
name (string): optional name tag of the data source
|
|
_store (bool): if the MemorySource is a part of a DataStore, in which case
|
|
"stix_data" is a direct reference to shared memory with DataSink
|
|
|
|
"""
|
|
super(MemorySource, self).__init__(name=name)
|
|
|
|
if _store:
|
|
self.data = stix_data
|
|
else:
|
|
self.data = {}
|
|
if stix_data:
|
|
if type(stix_data) == dict:
|
|
# stix objects are in a bundle
|
|
# verify STIX json data
|
|
r = validate_string(json.dumps(stix_data))
|
|
# make dictionary of the objects for easy lookup
|
|
if r.is_valid:
|
|
for stix_obj in stix_data["objects"]:
|
|
self.data[stix_obj["id"]] = stix_obj
|
|
else:
|
|
print("Error: json data passed to MemorySink() was found to not be validated by STIX 2 Validator")
|
|
print(r)
|
|
self.data = {}
|
|
elif type(stix_data) == list:
|
|
# stix objects are in a list
|
|
for stix_obj in stix_data:
|
|
r = validate_string(json.dumps(stix_obj))
|
|
if r.is_valid:
|
|
self.data[stix_obj["id"]] = stix_obj
|
|
else:
|
|
print("Error: STIX object %s is not valid under STIX 2 validator.") % stix_obj["id"]
|
|
print(r)
|
|
else:
|
|
raise ValueError("stix_data must be in bundle format or raw list")
|
|
|
|
def get(self, stix_id, _composite_filters=None):
|
|
"""
|
|
"""
|
|
if _composite_filters is None:
|
|
# if get call is only based on 'id', no need to search, just retrieve from dict
|
|
try:
|
|
stix_obj = self.data[stix_id]
|
|
except KeyError:
|
|
stix_obj = None
|
|
return stix_obj
|
|
|
|
# if there are filters from the composite level, process full query
|
|
query = [
|
|
{
|
|
"field": "id",
|
|
"op": "=",
|
|
"value": stix_id
|
|
}
|
|
]
|
|
|
|
all_data = self.query(query=query, _composite_filters=_composite_filters)
|
|
|
|
# reduce to most recent version
|
|
stix_obj = sorted(all_data, key=lambda k: k['modified'])[0]
|
|
|
|
return stix_obj
|
|
|
|
def all_versions(self, stix_id, _composite_filters=None):
|
|
"""
|
|
NOTE: since Memory sources/sinks dont handle mutliple verions of a STIX object,
|
|
this operation is futile. Translate call to get(). (Appoved by G.B.)
|
|
"""
|
|
|
|
# query = [
|
|
# {
|
|
# "field": "id",
|
|
# "op": "=",
|
|
# "value": stix_id
|
|
# }
|
|
# ]
|
|
|
|
# all_data = self.query(query=query, _composite_filters=_composite_filters)
|
|
|
|
return [self.get(stix_id=stix_id, _composite_filters=_composite_filters)]
|
|
|
|
def query(self, query=None, _composite_filters=None):
|
|
"""
|
|
|
|
"""
|
|
|
|
if query is None:
|
|
query = []
|
|
|
|
# combine all query filters
|
|
if self.filters:
|
|
query.extend(self.filters.values())
|
|
if _composite_filters:
|
|
query.extend(_composite_filters)
|
|
|
|
# deduplicate data before filtering -> Deduplication is not required as Memory only ever holds one version of an object
|
|
# all_data = self.depuplicate(all_data)
|
|
|
|
# apply STIX common property filters
|
|
all_data = self.apply_common_filters(self.data.values(), query)
|
|
|
|
return all_data
|
|
|
|
def load_from_file(self, file_path):
|
|
"""
|
|
"""
|
|
file_path = os.path.abspath(file_path)
|
|
stix_data = json.load(open(file_path, "r"))
|
|
|
|
r = validate_string(json.dumps(stix_data))
|
|
|
|
if r.is_valid:
|
|
for stix_obj in stix_data["objects"]:
|
|
self.data[stix_obj["id"]] = stix_obj
|
|
else:
|
|
print("Error: STIX data loaded from file (%s) was found to not be validated by STIX 2 Validator") % file_path
|
|
print(r)
|