mirror of
https://github.com/mandiant/capa.git
synced 2025-12-20 22:33:04 -08:00
116 lines
3.2 KiB
Python
116 lines
3.2 KiB
Python
# Copyright (C) 2023 Mandiant, Inc. All Rights Reserved.
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at: [package root]/LICENSE.txt
|
|
# Unless required by applicable law or agreed to in writing, software distributed under the License
|
|
# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and limitations under the License.
|
|
|
|
import textwrap
|
|
import contextlib
|
|
|
|
import capa.rules
|
|
import capa.rules.cache
|
|
|
|
R1 = capa.rules.Rule.from_yaml(
|
|
textwrap.dedent(
|
|
"""
|
|
rule:
|
|
meta:
|
|
name: test rule
|
|
authors:
|
|
- user@domain.com
|
|
scopes:
|
|
static: function
|
|
dynamic: process
|
|
examples:
|
|
- foo1234
|
|
- bar5678
|
|
features:
|
|
- and:
|
|
- number: 1
|
|
- number: 2
|
|
"""
|
|
)
|
|
)
|
|
|
|
R2 = capa.rules.Rule.from_yaml(
|
|
textwrap.dedent(
|
|
"""
|
|
rule:
|
|
meta:
|
|
name: test rule 2
|
|
authors:
|
|
- user@domain.com
|
|
scopes:
|
|
static: function
|
|
dynamic: process
|
|
examples:
|
|
- foo1234
|
|
- bar5678
|
|
features:
|
|
- and:
|
|
- number: 3
|
|
- number: 4
|
|
"""
|
|
)
|
|
)
|
|
|
|
|
|
def test_ruleset_cache_ids():
|
|
rs = capa.rules.RuleSet([R1])
|
|
content = capa.rules.cache.get_ruleset_content(rs)
|
|
|
|
rs2 = capa.rules.RuleSet([R1, R2])
|
|
content2 = capa.rules.cache.get_ruleset_content(rs2)
|
|
|
|
id = capa.rules.cache.compute_cache_identifier(content)
|
|
id2 = capa.rules.cache.compute_cache_identifier(content2)
|
|
assert id != id2
|
|
|
|
|
|
def test_ruleset_cache_save_load():
|
|
rs = capa.rules.RuleSet([R1])
|
|
content = capa.rules.cache.get_ruleset_content(rs)
|
|
|
|
id = capa.rules.cache.compute_cache_identifier(content)
|
|
assert id is not None
|
|
|
|
cache_dir = capa.rules.cache.get_default_cache_directory()
|
|
|
|
path = capa.rules.cache.get_cache_path(cache_dir, id)
|
|
with contextlib.suppress(OSError):
|
|
path.unlink()
|
|
|
|
capa.rules.cache.cache_ruleset(cache_dir, rs)
|
|
assert path.exists()
|
|
|
|
assert capa.rules.cache.load_cached_ruleset(cache_dir, content) is not None
|
|
|
|
|
|
def test_ruleset_cache_invalid():
|
|
rs = capa.rules.RuleSet([R1])
|
|
content = capa.rules.cache.get_ruleset_content(rs)
|
|
id = capa.rules.cache.compute_cache_identifier(content)
|
|
cache_dir = capa.rules.cache.get_default_cache_directory()
|
|
path = capa.rules.cache.get_cache_path(cache_dir, id)
|
|
with contextlib.suppress(OSError):
|
|
path.unlink()
|
|
|
|
capa.rules.cache.cache_ruleset(cache_dir, rs)
|
|
assert path.exists()
|
|
|
|
buf = path.read_bytes()
|
|
|
|
# corrupt the magic header
|
|
buf = b"x" + buf[1:]
|
|
|
|
# write the modified contents back to the file
|
|
path.write_bytes(buf)
|
|
|
|
# check if the file still exists
|
|
assert path.exists()
|
|
assert capa.rules.cache.load_cached_ruleset(cache_dir, content) is None
|
|
# the invalid cache should be deleted
|
|
assert not path.exists()
|