test_proxy_drop_ip.py

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
# Copyright (c) 2017 Mozilla Corporation
from positive_alert_test_case import PositiveAlertTestCase
from negative_alert_test_case import NegativeAlertTestCase
from alert_test_suite import AlertTestSuite


class TestAlertProxyDropIP(AlertTestSuite):
    alert_filename = "proxy_drop_ip"
    # This event is the default positive event that will cause the
    # alert to trigger
    default_event = {
        "_type": "event",
        "_source": {
            "category": "squid",
            "tags": ["squid"],
            "details": {
                "sourceipaddress": "1.2.3.4",
                "destination": "http://1.2.3.5/",
                "proxyaction": "TCP_DENIED/-",
            }
        }
    }

    # This event is an alternate destination that we'd want to aggregate
    default_event2 = AlertTestSuite.copy(default_event)
    default_event2["_source"]["details"]["destination"] = "1.2.3.5:1337"

    # This event is the default negative event that will not cause the
    # alert to trigger
    default_negative_event = AlertTestSuite.copy(default_event)
    default_negative_event["_source"]["details"]["destination"] = "http://foo.mozilla.com"

    # This alert is the expected result from running this task
    default_alert = {
        "category": "squid",
        "tags": ['squid', 'proxy'],
        "severity": "WARNING",
        "summary": 'Suspicious Proxy DROP event(s) detected from 1.2.3.4 to the following IP-based destination(s): http://1.2.3.5/',
    }

    # This alert is the expected result from this task against multiple matching events
    default_alert_aggregated = AlertTestSuite.copy(default_alert)
    default_alert_aggregated[
        "summary"] = 'Suspicious Proxy DROP event(s) detected from 1.2.3.4 to the following IP-based destination(s): 1.2.3.5:1337,http://1.2.3.5/'

    test_cases = []

    test_cases.append(
        PositiveAlertTestCase(
            description="Positive test with default events and default alert expected",
            events=AlertTestSuite.create_events(default_event, 1),
            expected_alert=default_alert
        )
    )

    test_cases.append(
        PositiveAlertTestCase(
            description="Positive test with default events and default alert expected - dedup",
            events=AlertTestSuite.create_events(default_event, 2),
            expected_alert=default_alert
        )
    )

    events1 = AlertTestSuite.create_events(default_event, 1)
    events2 = AlertTestSuite.create_events(default_event2, 1)
    test_cases.append(
        PositiveAlertTestCase(
            description="Positive test with default events and default alert expected - different dests",
            events=events1 + events2,
            expected_alert=default_alert_aggregated
        )
    )

    test_cases.append(
        NegativeAlertTestCase(
            description="Negative test with default negative event",
            events=AlertTestSuite.create_events(default_negative_event, 1),
        )
    )

    events = AlertTestSuite.create_events(default_event, 10)
    for event in events:
        event['_source']['category'] = 'bad'
    test_cases.append(
        NegativeAlertTestCase(
            description="Negative test case with events with incorrect category",
            events=events,
        )
    )

    events = AlertTestSuite.create_events(default_event, 10)
    for event in events:
        event['_source']['tags'] = 'bad tag example'
    test_cases.append(
        NegativeAlertTestCase(
            description="Negative test case with events with incorrect tags",
            events=events,
        )
    )
    events = AlertTestSuite.create_events(default_event, 10)
    for event in events:
        event['_source']['utctimestamp'] = AlertTestSuite.subtract_from_timestamp_lambda({
                                                                                         'minutes': 241})
        event['_source']['receivedtimestamp'] = AlertTestSuite.subtract_from_timestamp_lambda({
                                                                                              'minutes': 241})
    test_cases.append(
        NegativeAlertTestCase(
            description="Negative test case with old timestamp",
            events=events,
        )
    )

    events = AlertTestSuite.create_events(default_event, 10)
    for event in events:
        event['_source']['details']['destination'] = 'http://evil.com/evil.pdf'
    test_cases.append(
        NegativeAlertTestCase(
            description="Negative test case with events with non blacklisted extension",
            events=events,
        )
    )