Haketilo

# SPDX-License-Identifier: CC0-1.0

"""

Haketilo unit tests - modifying requests using webRequest API

"""

# This file is part of Haketilo

#

# Copyright (C) 2021, 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 re

from hashlib import sha256

import pytest

from ..script_loader import load_script

from .utils import are_scripts_allowed

allowed_url = 'https://site.with.scripts.allow.ed/'

blocked_url = 'https://site.with.scripts.block.ed/'

payload_url = 'https://site.with.paylo.ad/'

def webrequest_js():

    return (load_script('background/webrequest.js',

                        '#IMPORT common/patterns_query_tree.js AS pqt') +

            ''';

            // Mock pattern tree.

            tree = pqt.make();

            // Mock default allow.

            default_allow = {name: "default_allow", value: true};

            // Rule to block scripts.

            pqt.register(tree, "%(blocked)s***",

                         "~allow", 0);

            // Rule to allow scripts, but overridden by payload assignment.

            pqt.register(tree, "%(payload)s***", "~allow", 1);

            pqt.register(tree, "%(payload)s***", "somemapping",

                         {identifier: "someresource"});

            // Mock stream_filter.

            stream_filter.apply = (details, headers, policy) => headers;

            ''' % {'blocked': blocked_url, 'payload': payload_url})

def webrequest_js_start_called():

    return webrequest_js() + ';\nstart("somesecret");'

ext_url = 'moz-extension://49de6ce9-49fc-49e1-8102-7ef35286389c/html/settings.html'

prefix = 'X-Haketilo-' + sha256(ext_url.encode()).digest().hex()

# Prepare a list of headers as could be sent by a website.

sample_csp_header = {

    'name': 'Content-Security-Policy',

    'value': "script-src 'self';"

}

sample_csp_header_idx = 7

sample_headers = [

    {'name': 'Content-Type',     'value': 'text/html;charset=utf-8'},

    {'name': 'Content-Length',   'value': '61954'},

    {'name': 'Content-Language', 'value': 'en'},

    {'name': 'Expires',          'value': 'Mon, 12 Mar 2012 11:04...'},

    {'name': 'Last-Modified',    'value': 'Fri, 26 Jul 2013 22:50...'},

    {'name': 'Cache-Control',    'value': 'max-age=0, s-maxage=86...'},

    {'name': 'Age',              'value': '224'},

    {'name': 'Server',           'value': 'nginx/1.1.19'},

    {'name': 'Date',             'value': 'Thu, 10 Mar 2022 12:09...'}

]

sample_headers.insert(sample_csp_header_idx, sample_csp_header)

# Prepare a list of headers as would be crafted by Haketilo when there is a

# payload to inject.

nonce_source = f'somemapping:someresource:{payload_url}:somesecret'.encode()

nonce = f'nonce-{sha256(nonce_source).digest().hex()}'

payload_csp_header = {

    'name': f'Content-Security-Policy',

    'value': ("prefetch-src 'none'; script-src-attr 'none'; "

              f"script-src '{nonce}' 'unsafe-eval'; script-src-elem '{nonce}';")

}

sample_payload_headers = [

    *sample_headers,

    {'name': prefix, 'value': ':)'},

    payload_csp_header

]

sample_payload_headers[sample_csp_header_idx] = {

    **sample_csp_header,

    'name': f'{prefix}-{sample_csp_header["name"]}',

}

# Prepare a list of headers as would be crafted by Haketilo when scripts are

# blocked.

sample_blocked_headers = [*sample_payload_headers]

sample_blocked_headers.pop()

sample_blocked_headers.append(sample_csp_header)

sample_blocked_headers.append({

    'name': f'Content-Security-Policy',

    'value': ("prefetch-src 'none'; script-src-attr 'none'; "

              "script-src 'none' 'unsafe-eval'; script-src-elem 'none';")

})

@pytest.mark.get_page('https://gotmyowndoma.in')

@pytest.mark.parametrize('params', [

    (sample_headers,         allowed_url),

    (sample_blocked_headers, blocked_url),

    (sample_payload_headers, payload_url),

])

def test_webrequest_on_headers_received(driver, execute_in_page, params):

    """Unit-test the on_headers_received() function."""

    headers_out, url = params

    execute_in_page(

        '''{

        // Mock browser object.

        const url = arguments[0];

        this.browser = {runtime: {getURL: () => url}};

        }''',

        ext_url)

    execute_in_page(webrequest_js())

    execute_in_page('secret = "somesecret";')

    for headers_in in [

            sample_headers,

            sample_blocked_headers,

            sample_payload_headers

    ]:

        details = {'url': url, 'responseHeaders': headers_in, 'fromCache': True}

        res = execute_in_page('returnval(on_headers_received(arguments[0]));',

                              details)

        assert res == {'responseHeaders': headers_out}

@pytest.mark.ext_data({'background_script': webrequest_js_start_called})

@pytest.mark.usefixtures('webextension')

def test_webrequest_real_pages(driver, execute_in_page):

    """

    Test webRequest-based header modifications by loading actual pages and

    attempting to run scripts within them.

    """

    for attempt in range(10):

        driver.get('https://site.with.scripts.block.ed/')

        if not are_scripts_allowed(driver):

            break

        assert attempt != 9

    driver.get(allowed_url)

    assert are_scripts_allowed(driver)

    driver.get(payload_url)

    assert not are_scripts_allowed(driver)

    source = 'somemapping:someresource:https://site.with.paylo.ad/index.html:somesecret'

    assert are_scripts_allowed(driver, sha256(source.encode()).digest().hex())