Как обфусцировать JavaScript код

Нужно ли обфусцировать JavaScript

JavaScript код работает в веб браузерах пользователей и доступен им для изучения и других действий. Если вы задались вопросом «Зачем мне обфусцировать мой код JavaScript?», то существует множество причин, по которым рекомендуется защищать код, например:

  • Не позволяйте никому просто копировать/вставлять вашу работу. Это особенно важно для 100% клиентских проектов, таких как игры HTML5;
  • Удаление комментариев и пробелов, которые не нужны. Ускорение загрузки и повышение сложности для понимания;
  • Защита работ, которые ещё не оплачены. Вы можете показать свою работу клиенту, зная, что у него не будет исходного кода, пока счёт не будет оплачен;
  • Защита от проксирования сайта, программы для проксирования могут менять все внутренние ссылки, благодаря обфускации JavaScript можно защититься от автоматических парсеров.

Смотрите также статью «Деобфускация JavaScript кода».

Обфусцированный JavaScript медленнее!

В статье, ссылка на которую приведена выше, объясняется различие между минимизацией и обфускацией исходного кода. Кроме способа их выполнения и простоты восстановления в исходный вид, полученный результат также различается производительностью.

Минимизированный код: скачивается с сервера быстрее, так как имеет меньший размер, время выполнения (производительность) такая же, как и у кода в исходном варианте.

Обфусцированный код: обычно имеет больший размер и практически всегда является более медленным (на десятки процентов), поскольку кроме основной функции, выполняются сопутствующие действия, необходимые для запуска кода.

Итак, минимизированный код: легко восстановить в исходную форму, производительность не падает.

Обфусцированный код: (очень) трудно восстановить в исходную форму, производительность кода падает. В обфусцированный код можно добавить самозащиту и защиту от отладки, а также бессмысленные фрагменты кода, которые сильно усложнят его анализ.

Вывод: обфусцируйте только тот код, который вы хотите защитить. То есть имеет смысл обфусцировать свой код, но нет смысла обфусцировать код популярных JavaScript библиотек, которые и так общедоступны в исходном виде.

Программы для минимизации и обфускации JavaScript

В этой статье будут рассмотрены различные инструменты и способы защиты и оптимизации JavaScript скода.

Функции btoa и atob

В простых случаев для защиты от парсеров не нужны громоздкие инструменты обфускации и достаточно просто «спрятать» некоторые строки.

Чтобы было понятно, приведу практически пример. Мой сайт kali.tools стали проксировать на другом домене, т. е. выводится содержимое сайта и в нём заменены все ссылки на чужой домен, чтобы при переходе по ссылкам пользователь оставался на этом постороннем сайте.

Поскольку сайт копировался полностью, вместе со всеми скриптами, то достаточно добавить подобный код:

<script>
        if (/(www\.)?kali\.tools/.test(window.location.hostname)) {

        }
        else {
	     window.location = 'https://kali.tools';
        }
</script>

Этот код проверяет, на каком домене открыта страница, и если эта страница не на домене kali.tools, то делается переход на https://kali.tools.

Проблема в том, что при проксировании все упоминания kali.tools заменяются на ЧУЖОЙ_ДОМЕН.ru, в результате и код превращался в:

<script>
        if (/(www\.)?kali\.tools/.test(window.location.hostname)) {

        }
        else {
	     window.location = 'https://ЧУЖОЙ_ДОМЕН.ru';
        }
</script>

Код можно обфусцировать (но недостаточно просто минимизировать!). Но ещё проще спрятать строку «kali.tools» с помощью функций btoa и atob.

Функции btoa и atob являются встроенными функциями JavaScript и всегда доступны.

Функция btoa переводит указанную строку в набор символов (работает наподобие Base64), а функция atob выполняет обратную операцию.

Принцип действия в двух строках:

btoa('Some text'); // U29tZSB0ZXh0
atob('U29tZSB0ZXh0'); // Some text

Итак, посмотрим, во что превратиться строка «https://kali.tools»:

<script>
	document.write(btoa('https://kali.tools'));
</script>

Результат:

aHR0cHM6Ly9rYWxpLnRvb2xz

Теперь в моём простом коде делаем с помощью функции atob обратное преобразование этой строки, получаем:

if (/(www\.)?kali\.tools/.test(window.location.hostname)) {

} 
else {
	window.location = atob('aHR0cHM6Ly9rYWxpLnRvb2xz');
}

Данные код делает именно то, что нужно — проверяет на каком домене сайт был открыт и в случае если это не kali.tools, то делает редирект на kali.tools. При этом при проксировании сайта, парсеры не видят строку kali.tools и не делают никаких изменений в этом фрагменте кода.

JavaScript Obfuscator

JavaScript Obfuscator — это мощнейший обфускатор с множеством опций. С помощью JavaScript Obfuscator будет получен код, в котором действительно трудно разобраться. Дополнительно JavaScript Obfuscator может встроить защиту от отладки (при открытии панели «Отладка» в Инструментах веб-мастера в браузере, браузер будет зависать), самозащиту кода (вставка бессмысленных фрагментов и пр.). У JavaScript Obfuscator множество тонкий опций подстройки процесса обфускации.

Данный инструмент имеет как графический интерфейс, так и интерфейс командной строки.

JavaScript Obfuscator онлайн

Вместо установки на компьютер, вы можете использовать онлайн сервис от авторов, он расположен по адресу: https://obfuscator.io/

Установка JavaScript Obfuscator

Установка в Kali Linux

sudo apt install npm
sudo npm install --save-dev javascript-obfuscator
sudo ln -s ~/node_modules/javascript-obfuscator/bin/javascript-obfuscator /usr/local/bin
javascript-obfuscator -h

Установка в BlackArch

sudo pacman -S npm
sudo npm install --save-dev javascript-obfuscator
sudo ln -s ~/node_modules/javascript-obfuscator/bin/javascript-obfuscator /usr/local/bin
javascript-obfuscator -h

Как установить графический интерфейс JavaScript Obfuscator

Установка веб интерфейса JavaScript Obfuscator в Kali Linux

sudo apt remove cmdtest
sudo apt install npm
sudo npm install -g yarn
sudo npm cache clean -f
sudo npm install -g n
sudo n stable
git clone https://github.com/javascript-obfuscator/javascript-obfuscator-ui
cd javascript-obfuscator-ui/
yarn
npm run updatesemantic
npm run webpack:dev
node server.js

После этого веб-интерфейс будет доступен по адресу http://localhost:3000/

Установка веб интерфейса JavaScript Obfuscator в BlackArch

sudo pacman -S npm yarn
git clone https://github.com/javascript-obfuscator/javascript-obfuscator-ui
cd javascript-obfuscator-ui/
yarn
npm run updatesemantic
npm run webpack:dev
node server.js

После этого веб-интерфейс будет доступен по адресу http://localhost:3000/

Подробное описание опций и примеры запуска JavaScript Obfuscator вы найдёте на странице https://kali.tools/?p=5621

Чтобы в командной строке обфусцировать JavaScript код в файле script.js:

javascript-obfuscator script.js

Например, с опциями по умолчанию код:

if (/(www\.)?kali\.tools/.test(window.location.hostname)) {

} 
else {
	window.location = atob('aHR0cHM6Ly9rYWxpLnRvb2xz');
}

Превращается в:

var _0x2001=['test','aHR0cHM6Ly9rYWxpLnRvb2xz','location','hostname'];(function(_0x20ce42,_0x200145){var _0x20e03c=function(_0x46b9e3){while(--_0x46b9e3){_0x20ce42['push'](_0x20ce42['shift']());}};_0x20e03c(++_0x200145);}(_0x2001,0xed));var _0x20e0=function(_0x20ce42,_0x200145){_0x20ce42=_0x20ce42-0x0;var _0x20e03c=_0x2001[_0x20ce42];return _0x20e03c;};if(/(www\.)?kali\.tools/[_0x20e0('0x3')](window['location'][_0x20e0('0x2')])){}else{window[_0x20e0('0x1')]=atob(_0x20e0('0x0'));}

JSFuck

JSFuck это очень необычный обфускатор, любой JavaScript код он может представить записью всего из шести символов, а именно []()!+

Такая запись может поставить тупик сильнее, чем вывод рассмотренного выше JavaScript Obfuscator. Но, на самом деле, обфусцированный код может быть приведён к прежнему виду, например, инструментом JStillery.

Установка JSFuck

Установка в Kali Linux

git clone http://github.com/aemkei/jsfuck
cd jsfuck
php -S 127.0.0.1:8181

После этого JSFuck будет доступен по адресу http://localhost:8181/

Установка в BlackArch

sudo pacman -S jsfuck

Установка в Windows

Скачайте и распакуйте архив с программой: https://github.com/aemkei/jsfuck/archive/master.zip

Откройте в веб-браузере файл index.html их архива.

Независимо от способа установки, в файле index.html рекомендуется заменить строку

<input id="input" type="text" value="alert(1)"/>

на строку:

<textarea id="input">alert(1)</textarea>

В результате вы сможете вводить для обфускации не только отдельные строки, но и большие фрагменты кода.

Следующий код является рабочим, вы можете сохранить его в файл с расширением .htm и открыть в любом веб браузере:


<script> 
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</script>

Согласитесь, это очень необычно! Но это не всё! Автор JSFuck подготовил совершенно нереальные концепты, которые взрывают мозг:

  • запись JavaScript символами любого языка, в том числе иероглифами или несуществующим языком из «Звёздных войн»
  • невидимый JavaScript
  • JavaScript полностью записанный как ASCII

Эти крайне занимательные примеры будут рассмотрены в конце этой статьи, поскольку имеют больше образовательное (чем практическое) значение.

Онлайн сервис обфускации кода

Онлайн сервис, имеет не очень много опций: https://www.cleancss.com/javascript-obfuscate/

Получаемый код по стойкости к деобфускации является довольно слабым и может быть деобфусцирован инструментами, рассмотренными в статье «Деобфускация JavaScript кода».

Пример кода для обфускации:

if (/(www\.)?kali\.tools/.test(window.location.hostname)) {

} 
else {
	window.location = atob('aHR0cHM6Ly9rYWxpLnRvb2xz');
}

Полученный результат:

eval(function(p,a,c,k,e,d){e=function(c){return c.toString(36)};if(!''.replace(/^/,String)){while(c--){d[c.toString(a)]=k[c]||c.toString(a)}k=[function(e){return d[e]}];e=function(){return'\\w+'};c=1};while(c--){if(k[c]){p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c])}}return p}('4(/(3\\.)?2\\.5/.a(0.1.6)){}8{0.1=7(\'9\')}',11,11,'window|location|kali|www|if|tools|hostname|atob|else|aHR0cHM6Ly9rYWxpLnRvb2xz|test'.split('|'),0,{}))

UglifyJS

Инструмент UglifyJS отлично справляется с минимизацией кода JavaScript.

Установка UglifyJS

Установка в Kali Linux

sudo apt install uglifyjs

Установка в BlackArch

sudo pacman -S uglify-js

Пример запуска (для сжатия кода в файле redir.js):

uglifyjs redir.js -c

Пример исходного кода:

if (/(www\.)?kali\.tools/.test(window.location.hostname)) {

} 
else {
	window.location = atob('aHR0cHM6Ly9rYWxpLnRvb2xz');
}

Пример полученного результата:

/(www\.)?kali\.tools/.test(window.location.hostname)||(window.location=atob("aHR0cHM6Ly9rYWxpLnRvb2xz"));

У данного инструмента много опций настройки, полный список вы найдёте на странице https://kali.tools/?p=5594

slimit и python-jsmin

Программы slimit и python-jsmin представляют собой модули Python для сжатия исходного кода JavaScript.

Установка slimit

В Kali Linux:

sudo apt install slimit

В BlackArch:

sudo pacman -S slimit

Сайт программы: http://slimit.readthedocs.io/en/latest/

Установка python-jsmin в BlackArch:

sudo pacman -S python-jsmin

Сайт программы: https://pypi.python.org/pypi/jsmin

Самая сложная обфускация JavaScript

Я уже упоминал, что автор JSFuck подготовил самые необычные формы и примеры JavaScript, их список вы найдёте на сайте http://aem1k.com/. Вот некоторые из них:

К примеру, код, написанный тайскими символами:

ก='',ว=!ก+ก,อ=!ว+ก,ซ=ก+{},ฝ=ว[ก++],ค=ว[ง=ก],ญ=++ง+ก,ฒ=ซ[ง+ญ],ว[ฒ+=ซ[ก]+(ว.อ+ซ)[ก]+อ[ญ]+ฝ+ค+ว[ง]+ฒ+ฝ+ซ[ก]+ค][ฒ](อ[ก]+อ[ง]+ว[ญ]+ค+ฝ+"(ก)")()

Код, написанный с помощью только исков:

x='',X=!x+x,xx=!X+x,xX=x+{},Xx=X[x++],XX=X[Xxx=x],XxX=++Xxx+x,xxx=xX[Xxx+XxX],X[xxx+=xX[x]+(X.xx+xX)[x]+xx[XxX]+Xx+XX+X[Xxx]+xxx+Xx+xX[x]+XX][xxx](xx[x]+xx[Xxx]+X[XxX]+XX+Xx+"(x)")()

Это рабочий код, который вы можете поместить в теги <script> … </script> и открыть в веб-браузере.

  • // VOID — невидимые переменные и код: https://aem1k.com/void/
  • M4TR1X 雨 — эффект Матрицы, написанный на JavaScript с использованием только азиатских символов: http://aem1k.com/雨/

  • ЗВЕЗДА СМЕРТИ - Death Star из кода JavaScript размеров 666 байт выполненным в виде ASCII арта и с XSS атакой: http://aem1k.com/deathstar/
  • Invisible Code — невидимый исходный код: http://aem1k.com/0/

В последнем примере вы не сможете украсть JavaScript код копипастой!

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