71 lines
2.6 KiB
PHP
71 lines
2.6 KiB
PHP
<?php
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namespace Ratchet\Component\WebSocket\Version;
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use Guzzle\Http\Message\RequestInterface;
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use Guzzle\Http\Message\Response;
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/**
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* FOR THE LOVE OF BEER, PLEASE PLEASE PLEASE DON'T allow the use of this in your application!
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* Hixie76 is bad for 2 (there's more) reasons:
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* 1) The handshake is done in HTTP, which includes a key for signing in the body...
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* BUT there is no Length defined in the header (as per HTTP spec) so the TCP buffer can't tell when the message is done!
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* 2) By nature it's insecure. Google did a test study where they were able to do a
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* man-in-the-middle attack on 10%-15% of the people who saw their ad who had a browser (currently only Safari) supporting the Hixie76 protocol.
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* This was exploited by taking advantage of proxy servers in front of the user who ignored some HTTP headers in the handshake
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* The Hixie76 is currently implemented by Safari
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* Handshake from Andrea Giammarchi (http://webreflection.blogspot.com/2010/06/websocket-handshake-76-simplified.html)
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* @link http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-76
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*/
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class Hixie76 implements VersionInterface {
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public static function isProtocol(RequestInterface $request) {
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return !(null === $request->getHeader('Sec-WebSocket-Key2'));
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}
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/**
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* @param string
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* @return string
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*/
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public function handshake(RequestInterface $request) {
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$body = $this->sign($request->getHeader('Sec-WebSocket-Key1'), $request->getHeader('Sec-WebSocket-Key2'), $request->getBody());
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$headers = array(
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'Upgrade' => 'WebSocket'
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, 'Connection' => 'Upgrade'
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, 'Sec-WebSocket-Origin' => $request->getHeader('Origin')
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, 'Sec-WebSocket-Location' => 'ws://' . $request->getHeader('Host') . $request->getPath()
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);
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return new \Guzzle\Http\Message\Response('101', $headers, $body);
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}
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public function newMessage() {
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return new Hixie76\Message;
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}
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public function newFrame() {
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return new Hixie76\Frame;
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}
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public function frame($message, $mask = true) {
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return chr(0) . $message . chr(255);
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}
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public function generateKeyNumber($key) {
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if (substr_count($key, ' ') == 0) {
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return '';
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}
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$int = preg_replace('[\D]', '', $key) / substr_count($key, ' ');
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return (is_int($int)) ? $int : '';
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}
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protected function sign($key1, $key2, $code) {
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return md5(
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pack('N', $this->generateKeyNumber($key1))
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. pack('N', $this->generateKeyNumber($key2))
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. $code
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, true);
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}
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} |