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cti-python-stix2
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Add enforcement of a new STIX 2.1 SCO extension name requirement: 

that it must end with "-ext".
master
Michael Chisholm 2020-03-10 20:24:53 -04:00
parent 380926cff5
commit d708537b85
5 changed files with 77 additions and 49 deletions
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58
stix2/core.py
View File

@ -7,10 +7,10 @@ import re
import stix2
from .base import _STIXBase
from .base import _Observable, _STIXBase
from .exceptions import ParseError
from .markings import _MarkingsMixin
from .utils import _get_dict
from .utils import SCO21_EXT_REGEX, TYPE_REGEX, _get_dict
STIX2_OBJ_MAPS = {}
@ -258,22 +258,54 @@ def _register_observable(new_observable, version=None):
OBJ_MAP_OBSERVABLE[new_observable._type] = new_observable
def _register_observable_extension(observable, new_extension, version=None):
def _register_observable_extension(
observable, new_extension, version=stix2.DEFAULT_VERSION
):
"""Register a custom extension to a STIX Cyber Observable type.
Args:
observable: An observable object
observable: An observable class or instance
new_extension (class): A class to register in the Observables
Extensions map.
version (str): Which STIX2 version to use. (e.g. "2.0", "2.1"). If
None, use latest version.
version (str): Which STIX2 version to use. (e.g. "2.0", "2.1").
Defaults to the latest supported version.
"""
if version:
v = 'v' + version.replace('.', '')
else:
# Use default version (latest) if no version was provided.
v = 'v' + stix2.DEFAULT_VERSION.replace('.', '')
obs_class = observable if isinstance(observable, type) else \
type(observable)
ext_type = new_extension._type
if not issubclass(obs_class, _Observable):
raise ValueError("'observable' must be a valid Observable class!")
if version == "2.0":
if not re.match(TYPE_REGEX, ext_type):
raise ValueError(
"Invalid extension type name '%s': must only contain the "
"characters a-z (lowercase ASCII), 0-9, and hyphen (-)." %
ext_type,
)
else: # 2.1+
if not re.match(SCO21_EXT_REGEX, ext_type):
raise ValueError(
"Invalid extension type name '%s': must only contain the "
"characters a-z (lowercase ASCII), 0-9, hyphen (-), and end "
"with '-ext'." % ext_type,
)
if len(ext_type) < 3 or len(ext_type) > 250:
raise ValueError(
"Invalid extension type name '%s': must be between 3 and 250"
" characters." % ext_type,
)
if not new_extension._properties:
raise ValueError(
"Invalid extension: must define at least one property: " +
ext_type,
)
v = 'v' + version.replace('.', '')
try:
observable_type = observable._type
@ -287,7 +319,7 @@ def _register_observable_extension(observable, new_extension, version=None):
EXT_MAP = STIX2_OBJ_MAPS[v]['observable-extensions']
try:
EXT_MAP[observable_type][new_extension._type] = new_extension
EXT_MAP[observable_type][ext_type] = new_extension
except KeyError:
if observable_type not in OBJ_MAP_OBSERVABLE:
raise ValueError(
@ -296,7 +328,7 @@ def _register_observable_extension(observable, new_extension, version=None):
% observable_type,
)
else:
EXT_MAP[observable_type] = {new_extension._type: new_extension}
EXT_MAP[observable_type] = {ext_type: new_extension}
def _collect_stix2_mappings():

29
stix2/custom.py
View File

@ -1,6 +1,8 @@
from collections import OrderedDict
import re
import six
from .base import _cls_init, _Extension, _Observable, _STIXBase
from .core import (
STIXDomainObject, _register_marking, _register_object,
@ -113,24 +115,23 @@ def _custom_observable_builder(cls, type, properties, version, id_contrib_props=
def _custom_extension_builder(cls, observable, type, properties, version):
if not observable or not issubclass(observable, _Observable):
raise ValueError("'observable' must be a valid Observable class!")
try:
prop_dict = OrderedDict(properties)
except TypeError as e:
six.raise_from(
ValueError(
"Extension properties must be dict-like, e.g. a list "
"containing tuples. For example, "
"[('property1', IntegerProperty())]",
),
e,
)
class _CustomExtension(cls, _Extension):
if not re.match(TYPE_REGEX, type):
raise ValueError(
"Invalid extension type name '%s': must only contain the "
"characters a-z (lowercase ASCII), 0-9, and hyphen (-)." % type,
)
elif len(type) < 3 or len(type) > 250:
raise ValueError("Invalid extension type name '%s': must be between 3 and 250 characters." % type)
if not properties or not isinstance(properties, list):
raise ValueError("Must supply a list, containing tuples. For example, [('property1', IntegerProperty())]")
_type = type
_properties = OrderedDict(properties)
_properties = prop_dict
def __init__(self, **kwargs):
_Extension.__init__(self, **kwargs)

9
stix2/test/v20/test_custom.py
View File

@ -821,27 +821,24 @@ def test_custom_extension_invalid_type_name():
def test_custom_extension_no_properties():
with pytest.raises(ValueError) as excinfo:
with pytest.raises(ValueError):
@stix2.v20.CustomExtension(stix2.v20.DomainName, 'x-new-ext2', None)
class BarExtension():
pass
assert "Must supply a list, containing tuples." in str(excinfo.value)
def test_custom_extension_empty_properties():
with pytest.raises(ValueError) as excinfo:
with pytest.raises(ValueError):
@stix2.v20.CustomExtension(stix2.v20.DomainName, 'x-new-ext2', [])
class BarExtension():
pass
assert "Must supply a list, containing tuples." in str(excinfo.value)
def test_custom_extension_dict_properties():
with pytest.raises(ValueError) as excinfo:
with pytest.raises(ValueError):
@stix2.v20.CustomExtension(stix2.v20.DomainName, 'x-new-ext2', {})
class BarExtension():
pass
assert "Must supply a list, containing tuples." in str(excinfo.value)
def test_custom_extension_no_init_1():

29
stix2/test/v21/test_custom.py
View File

@ -800,7 +800,7 @@ def test_custom_extension_wrong_observable_type():
)
def test_custom_extension_with_list_and_dict_properties_observable_type(data):
@stix2.v21.CustomExtension(
stix2.v21.UserAccount, 'some-extension', [
stix2.v21.UserAccount, 'some-extension-ext', [
('keys', stix2.properties.ListProperty(stix2.properties.DictionaryProperty, required=True)),
],
)
@ -876,32 +876,29 @@ def test_custom_extension_invalid_type_name():
def test_custom_extension_no_properties():
with pytest.raises(ValueError) as excinfo:
@stix2.v21.CustomExtension(stix2.v21.DomainName, 'x-new-ext2', None)
with pytest.raises(ValueError):
@stix2.v21.CustomExtension(stix2.v21.DomainName, 'x-new2-ext', None)
class BarExtension():
pass
assert "Must supply a list, containing tuples." in str(excinfo.value)
def test_custom_extension_empty_properties():
with pytest.raises(ValueError) as excinfo:
@stix2.v21.CustomExtension(stix2.v21.DomainName, 'x-new-ext2', [])
with pytest.raises(ValueError):
@stix2.v21.CustomExtension(stix2.v21.DomainName, 'x-new2-ext', [])
class BarExtension():
pass
assert "Must supply a list, containing tuples." in str(excinfo.value)
def test_custom_extension_dict_properties():
with pytest.raises(ValueError) as excinfo:
@stix2.v21.CustomExtension(stix2.v21.DomainName, 'x-new-ext2', {})
with pytest.raises(ValueError):
@stix2.v21.CustomExtension(stix2.v21.DomainName, 'x-new2-ext', {})
class BarExtension():
pass
assert "Must supply a list, containing tuples." in str(excinfo.value)
def test_custom_extension_no_init_1():
@stix2.v21.CustomExtension(
stix2.v21.DomainName, 'x-new-extension', [
stix2.v21.DomainName, 'x-new-extension-ext', [
('property1', stix2.properties.StringProperty(required=True)),
],
)
@ -914,7 +911,7 @@ def test_custom_extension_no_init_1():
def test_custom_extension_no_init_2():
@stix2.v21.CustomExtension(
stix2.v21.DomainName, 'x-new-ext2', [
stix2.v21.DomainName, 'x-new2-ext', [
('property1', stix2.properties.StringProperty(required=True)),
],
)
@ -949,14 +946,14 @@ def test_custom_and_spec_extension_mix():
file_obs = stix2.v21.File(
name="my_file.dat",
extensions={
"x-custom1": {
"custom1-ext": {
"a": 1,
"b": 2,
},
"ntfs-ext": {
"sid": "S-1-whatever",
},
"x-custom2": {
"custom2-ext": {
"z": 99.9,
"y": False,
},
@ -969,8 +966,8 @@ def test_custom_and_spec_extension_mix():
allow_custom=True,
)
assert file_obs.extensions["x-custom1"] == {"a": 1, "b": 2}
assert file_obs.extensions["x-custom2"] == {"y": False, "z": 99.9}
assert file_obs.extensions["custom1-ext"] == {"a": 1, "b": 2}
assert file_obs.extensions["custom2-ext"] == {"y": False, "z": 99.9}
assert file_obs.extensions["ntfs-ext"].sid == "S-1-whatever"
assert file_obs.extensions["raster-image-ext"].image_height == 1024

1
stix2/utils.py
View File

@ -26,6 +26,7 @@ NOW = object()
STIX_UNMOD_PROPERTIES = ['created', 'created_by_ref', 'id', 'type']
TYPE_REGEX = r'^\-?[a-z0-9]+(-[a-z0-9]+)*\-?$'
SCO21_EXT_REGEX = r'^\-?[a-z0-9]+(-[a-z0-9]+)*\-ext$'
class STIXdatetime(dt.datetime):