171 lines
9.8 KiB
Python
171 lines
9.8 KiB
Python
import tempfile
|
|
import time
|
|
import unittest
|
|
from pathlib import Path
|
|
|
|
from fgai.baseline import BaselineStore
|
|
from fgai.logs import parse_log_line
|
|
from fgai.stream_profiles import parse_profiles
|
|
|
|
|
|
class BaselineTests(unittest.TestCase):
|
|
def test_creates_profile_after_twelve_completed_windows(self):
|
|
with tempfile.TemporaryDirectory() as directory:
|
|
store = BaselineStore(str(Path(directory) / "baseline.sqlite3"))
|
|
for index in range(13):
|
|
store.ingest([parse_log_line(f"srcip=10.0.0.1 dstport={1000 + index} hitcount=2 sentbyte=5")], observed_at=1_700_000_000 + index * 300)
|
|
profiles = store.profiles({"10.0.0.1"})
|
|
self.assertEqual(profiles["10.0.0.1"]["samples"], 12)
|
|
self.assertIn("1000", profiles["10.0.0.1"]["known_destination_ports"])
|
|
|
|
def test_profile_events_are_deduplicated_between_polls(self):
|
|
with tempfile.TemporaryDirectory() as directory:
|
|
store = BaselineStore(str(Path(directory) / "baseline.sqlite3"))
|
|
profiles = parse_profiles([{"stream_id": "windows", "entity_field": "username", "categorical_fields": ["action"]}])
|
|
events = [
|
|
parse_log_line(f"fgai_stream_id=windows username=alice action=login event={index}")
|
|
for index in range(12)
|
|
]
|
|
self.assertEqual(store.ingest_profile_fields(events, profiles, observed_at=1_700_000_000), 1)
|
|
self.assertEqual(store.ingest_profile_fields(events, profiles, observed_at=1_700_000_300), 0)
|
|
|
|
def test_profile_can_baseline_multiple_entities_from_same_event(self):
|
|
with tempfile.TemporaryDirectory() as directory:
|
|
store = BaselineStore(str(Path(directory) / "baseline.sqlite3"))
|
|
profiles = parse_profiles([{"stream_id": "vpn", "entity_fields": ["username", "srcip"], "categorical_fields": ["action"]}])
|
|
events = [parse_log_line("fgai_stream_id=vpn username=alice srcip=10.0.0.5 action=login")]
|
|
|
|
self.assertEqual(store.ingest_profile_fields(events, profiles, observed_at=1_700_000_000), 2)
|
|
readiness = store.profile_readiness(profiles)
|
|
|
|
self.assertEqual(readiness[0]["buckets"], 1)
|
|
|
|
def test_profile_rate_burst_is_one_confident_detector(self):
|
|
with tempfile.TemporaryDirectory() as directory:
|
|
store = BaselineStore(str(Path(directory) / "baseline.sqlite3"))
|
|
profiles = parse_profiles([{"stream_id": "windows", "entity_field": "username", "categorical_fields": ["action"]}])
|
|
for index in range(12):
|
|
event = parse_log_line(f"fgai_stream_id=windows username=alice action=login baseline={index}")
|
|
store.ingest_profile_fields([event], profiles, observed_at=1_700_000_000 + index * 300)
|
|
|
|
burst = [
|
|
parse_log_line(f"fgai_stream_id=windows username=alice action=login burst={index}")
|
|
for index in range(20)
|
|
]
|
|
deviations = store.profile_deviations(burst, profiles)["alice"]
|
|
|
|
rate = next(item for item in deviations if item["detector"] == "event_rate_burst")
|
|
self.assertEqual(rate["field"], "event_rate")
|
|
self.assertEqual(rate["baseline_samples"], 12)
|
|
|
|
def test_profile_authentication_failure_burst(self):
|
|
with tempfile.TemporaryDirectory() as directory:
|
|
store = BaselineStore(str(Path(directory) / "baseline.sqlite3"))
|
|
profiles = parse_profiles([{"stream_id": "windows", "entity_field": "username", "categorical_fields": ["action"]}])
|
|
for index in range(12):
|
|
event = parse_log_line(f"fgai_stream_id=windows username=alice action=failed baseline={index}")
|
|
store.ingest_profile_fields([event], profiles, observed_at=1_700_000_000 + index * 300)
|
|
|
|
burst = [
|
|
parse_log_line(f"fgai_stream_id=windows username=alice action=failed burst={index}")
|
|
for index in range(5)
|
|
]
|
|
deviations = store.profile_deviations(burst, profiles)["alice"]
|
|
auth = next(item for item in deviations if item["detector"] == "auth_failure_burst")
|
|
self.assertEqual(auth["current"], 5)
|
|
|
|
def test_profile_field_weights_raise_detector_score(self):
|
|
with tempfile.TemporaryDirectory() as directory:
|
|
store = BaselineStore(str(Path(directory) / "baseline.sqlite3"))
|
|
profiles = parse_profiles([{"stream_id": "windows", "entity_field": "username", "categorical_fields": ["action"], "field_weights": {"auth_failure_burst": 2}}])
|
|
for index in range(12):
|
|
event = parse_log_line(f"fgai_stream_id=windows username=alice action=failed baseline={index}")
|
|
store.ingest_profile_fields([event], profiles, observed_at=1_700_000_000 + index * 300)
|
|
|
|
burst = [
|
|
parse_log_line(f"fgai_stream_id=windows username=alice action=failed burst={index}")
|
|
for index in range(5)
|
|
]
|
|
deviations = store.profile_deviations(burst, profiles)["alice"]
|
|
auth = next(item for item in deviations if item["detector"] == "auth_failure_burst")
|
|
self.assertEqual(auth["weight"], 2.0)
|
|
self.assertGreater(auth["score"], auth["base_score"])
|
|
|
|
def test_maintenance_prunes_old_baseline_rows(self):
|
|
with tempfile.TemporaryDirectory() as directory:
|
|
store = BaselineStore(str(Path(directory) / "baseline.sqlite3"))
|
|
profiles = parse_profiles([{"stream_id": "windows", "entity_field": "username", "categorical_fields": ["action"]}])
|
|
old = int(time.time()) - 20 * 86400
|
|
recent = int(time.time())
|
|
|
|
store.ingest([parse_log_line("srcip=10.0.0.1 dstport=443 old=1")], observed_at=old)
|
|
store.ingest_profile_fields([parse_log_line("fgai_stream_id=windows username=alice action=login old=1")], profiles, observed_at=old)
|
|
store.ingest([parse_log_line("srcip=10.0.0.2 dstport=443 recent=1")], observed_at=recent)
|
|
store.ingest_profile_fields([parse_log_line("fgai_stream_id=windows username=bob action=login recent=1")], profiles, observed_at=recent)
|
|
|
|
result = store.maintenance(retention_days=7, value_retention_days=7, max_values_per_field=2000)
|
|
|
|
self.assertGreaterEqual(result["deleted"]["source_buckets"], 1)
|
|
self.assertGreaterEqual(result["deleted"]["profile_buckets"], 1)
|
|
self.assertGreaterEqual(result["deleted"]["seen_events"], 1)
|
|
self.assertGreaterEqual(result["deleted"]["profile_seen_events"], 1)
|
|
|
|
def test_rare_values_are_limited_per_entity(self):
|
|
with tempfile.TemporaryDirectory() as directory:
|
|
store = BaselineStore(str(Path(directory) / "baseline.sqlite3"))
|
|
profiles = parse_profiles([{"stream_id": "dns", "entity_field": "srcip", "categorical_fields": ["query_domain"]}])
|
|
now = int(time.time()) - 86400
|
|
baseline = [
|
|
parse_log_line(f"fgai_stream_id=dns srcip=10.0.0.5 query_domain=known-{index}.example baseline={index}")
|
|
for index in range(30)
|
|
]
|
|
store.ingest_profile_fields(baseline, profiles, observed_at=now)
|
|
|
|
burst = [
|
|
parse_log_line(f"fgai_stream_id=dns srcip=10.0.0.5 query_domain=new-{index}.example burst={index}")
|
|
for index in range(12)
|
|
]
|
|
deviations = store.profile_deviations(burst, profiles)["10.0.0.5"]
|
|
rare = [item for item in deviations if item["detector"] == "rare_value"]
|
|
|
|
self.assertLessEqual(len(rare), 5)
|
|
self.assertTrue(all(item["score"] >= 15 for item in rare))
|
|
|
|
def test_training_days_gate_profile_deviations(self):
|
|
with tempfile.TemporaryDirectory() as directory:
|
|
store = BaselineStore(str(Path(directory) / "baseline.sqlite3"))
|
|
profiles = parse_profiles([{"stream_id": "windows", "entity_field": "username", "categorical_fields": ["action"]}])
|
|
now = int(time.time())
|
|
for index in range(12):
|
|
event = parse_log_line(f"fgai_stream_id=windows username=alice action=failed baseline={index}")
|
|
store.ingest_profile_fields([event], profiles, observed_at=now - 86400 + index * 300)
|
|
|
|
burst = [
|
|
parse_log_line(f"fgai_stream_id=windows username=alice action=failed burst={index}")
|
|
for index in range(5)
|
|
]
|
|
|
|
self.assertNotIn("alice", store.profile_deviations(burst, profiles, min_training_days=7))
|
|
self.assertIn("alice", store.profile_deviations(burst, profiles, min_training_days=0))
|
|
|
|
def test_custom_relationship_flags_new_user_source_ip(self):
|
|
with tempfile.TemporaryDirectory() as directory:
|
|
store = BaselineStore(str(Path(directory) / "baseline.sqlite3"))
|
|
profiles = parse_profiles([{
|
|
"stream_id": "windows",
|
|
"entity_field": "username",
|
|
"categorical_fields": ["action"],
|
|
"relationship_fields": [{"left": "username", "right": "srcip", "name": "user source IP"}],
|
|
}])
|
|
for index in range(12):
|
|
event = parse_log_line(f"fgai_stream_id=windows username=peter srcip=10.0.0.10 action=success baseline={index}")
|
|
store.ingest_profile_fields([event], profiles, observed_at=1_700_000_000 + index * 300)
|
|
|
|
current = [parse_log_line("fgai_stream_id=windows username=peter srcip=10.0.0.99 action=success current=1")]
|
|
deviations = store.profile_deviations(current, profiles)["peter"]
|
|
|
|
relation = next(item for item in deviations if item["detector"] == "new_relationship")
|
|
self.assertEqual(relation["field"], "relationship:username->srcip")
|
|
self.assertEqual(relation["value"], "10.0.0.99")
|
|
self.assertIn("new srcip value for username=peter", relation["reason"])
|