Haketilo

# SPDX-License-Identifier: CC0-1.0

"""

Haketilo unit tests - enforcing script blocking policy from content script

"""

# This file is part of Haketilo

#

# Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>

#

# This program is free software: you can redistribute it and/or modify

# it under the terms of the CC0 1.0 Universal License as published by

# the Creative Commons Corporation.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# CC0 1.0 Universal License for more details.

import pytest

import json

import urllib.parse

from selenium.webdriver.support.ui import WebDriverWait

from ..script_loader import load_script

from .utils import are_scripts_allowed

# For simplicity, we'll use one nonce in all test cases.

nonce = 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855'

allow_policy = {'allow': True}

block_policy = {

    'allow': False,

    'csp': f"prefetch-src 'none'; script-src-attr 'none'; script-src 'none'; script-src-elem 'none'; frame-src http://* https://*;"

}

payload_policy = {

    'mapping': 'somemapping',

    'payload': {'identifier': 'someresource'},

    'csp': f"prefetch-src 'none'; script-src-attr 'none'; script-src 'nonce-{nonce}'; script-src-elem 'nonce-{nonce}';"

}

content_script = load_script('content/policy_enforcing.js') + ''';{

const smuggled_what_to_do = /^[^#]*#?(.*)$/.exec(document.URL)[1];

const what_to_do = smuggled_what_to_do === "" ? {policy: {allow: true}} :

                   JSON.parse(decodeURIComponent(smuggled_what_to_do));

if (what_to_do.csp_off) {

    const orig_DOMParser = window.DOMParser;

    window.DOMParser = function() {

        const parser = new orig_DOMParser();

        this.parseFromString = () => parser.parseFromString('', 'text/html');

    }

}

enforce_blocking(what_to_do.policy);

}'''

def get(driver, page, what_to_do):

    driver.get(page + '#' + urllib.parse.quote(json.dumps(what_to_do)))

    driver.execute_script('window.before_reload = true; location.reload();')

    done = lambda _: not driver.execute_script('return window.before_reload;')

    WebDriverWait(driver, 10).until(done)

@pytest.mark.ext_data({'content_script': content_script})

@pytest.mark.usefixtures('webextension')

# Under Mozilla we use several mechanisms of script blocking. Some serve as

# fallbacks in case others break. CSP one of those mechanisms. Here we run the

# test once with CSP blocking on and once without it. This allows us to verify

# that the CSP-less blocking approaches by themselves also work. We don't do the

# reverse (CSP on and other mechanisms off) because CSP rules added through

# <meta> injection are not reliable enough - they do not always take effect

# immediately and there's nothing we can do to fix it.

@pytest.mark.parametrize('csp_off_setting', [{}, {'csp_off': True}])

def test_policy_enforcing_html(driver, execute_in_page, csp_off_setting):

    """

    A test case of sanitizing <script>s and intrinsic javascript in pages.

    """

    # First, see if scripts run when not blocked.

    get(driver, 'https://gotmyowndoma.in/scripts_to_block_1.html', {

        'policy': allow_policy,

        **csp_off_setting

    })

    for i in range(1, 3):

        driver.find_element_by_id(f'clickme{i}').click()

    assert set(driver.execute_script('return window.__run || [];')) == \

        {'inline', 'on', 'href', 'src', 'data'}

    assert are_scripts_allowed(driver)

    # Now, verify scripts don't run when blocked.

    get(driver, 'https://gotmyowndoma.in/scripts_to_block_1.html', {

        'policy': block_policy,

        **csp_off_setting

    })

    for i in range(1, 3):

        driver.find_element_by_id(f'clickme{i}').click()

    assert set(driver.execute_script('return window.__run || [];')) == set()

    assert bool(csp_off_setting) == are_scripts_allowed(driver)

    # Now, verify only scripts with nonce can run when payload is injected.

    get(driver, 'https://gotmyowndoma.in/scripts_to_block_1.html', {

        'policy': payload_policy,

        **csp_off_setting

    })

    for i in range(1, 3):

        driver.find_element_by_id(f'clickme{i}').click()

    assert set(driver.execute_script('return window.__run || [];')) == set()

    assert bool(csp_off_setting) == are_scripts_allowed(driver)

    assert are_scripts_allowed(driver, nonce)