如何从 Javascript 设置 WebSocket Origin Header？

Question

我正在尝试使用 javascript 代表 [= 从本地 test.dev 页面向 IP 123.123.123.123 的服务器运行发出 websocket 请求14=]。请求通过，但 123.123.123.123 服务器在 websocket 请求中看到 Origin: test.dev header 并拒绝连接，因为它想看到 Origin: test.com.

这里是连接套接字的javascript代码：

ws = new WebSocket("123.123.123.123");

如何使用 javascript 与不诚实的 Origin header of Origin: test.com 启动 websocket 连接？

我希望这样的东西能奏效，但我找不到这样的东西：

ws = new WebSocket("123.123.123.123", "test.com");

Answer 1

How can I use javascript to start a websocket connection with a dishonest Origin header of Origin: test.com?

如果我们可以在 JavaScript 中伪造请求的来源，同源策略就不会很好地保护我们的安全。它的存在只是为了保护我们免受这种和其他潜在的攻击媒介。

由于这看起来像是开发工作，您是否考虑过使用网络调试代理，例如 Fiddler (free) or Charles（付费）？通过这些，您可以为自己的机器或通过调试器代理的任何测试机器修改 WebSocket 的初始握手请求或响应。

Answer 2

简单的解决方案是在 hosts 文件中简单地创建一个条目以将 test.com 映射到 123.123.123.123。稍后当您想要连接 "real" test.com.

时，您需要删除此条目

一个不那么棘手的解决方案需要使用代理，它可以 re-write 你的 header 为你 on-the-fly。考虑在您的系统上安装 nginx，然后将请求代理到 123.123.123.123，保持一切相同除了来源 header。这是您在 nginx 配置文件中需要的条目：

server {
    server_name test.dev;

    location / {
        proxy_pass http://123.123.123.123;
        proxy_set_header Origin test.com;

        # the following 3 are required to proxy WebSocket connections.
        # See more here: http://nginx.com/blog/websocket-nginx/

        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }
}

Answer 3

如果你真的必须从 javascript 伪造一个假的 'origin' header 值 - 有办法。您不会在普遍接受的原则手册中找到它，但在这里：

创建一个 php 文件来调用套接字，并使用伪造的原始值。现在使用 ajax 调用 php 文件，你 javascript.

它可能不优雅、不合乎道德或不可接受，但永远不要接受任何人告诉你做不到。

'send.php' 是使用 ajax 从 javascript

调用的

send.php 内容

require "websocket_client.php";
$client = new Client("IP_ADDR:PORT", $_GET[mobile] ."|".$_GET[login]);
$client->send('1112223333|sms');
$client->send(json_encode(array('login'=>$user,'msg'=>$msg)));
echo $client->receive();`enter code here`

websocket_client.php 是一个 class 文件，具有基本的 websocket 功能（包括自定义原始值

 /**


 * Perform WebSocket handshake
   */
  protected function connect() {
    $url_parts = parse_url($this->socket_uri);
    $scheme    = $url_parts['scheme'];
    $host      = $url_parts['host'];
    $user      = isset($url_parts['user']) ? $url_parts['user'] : '';
    $pass      = isset($url_parts['pass']) ? $url_parts['pass'] : '';
    $port      = isset($url_parts['port']) ? $url_parts['port'] : ($scheme === 'wss' ? 443 : 80);
    $path      = isset($url_parts['path']) ? $url_parts['path'] : '/';
    $query     = isset($url_parts['query'])    ? $url_parts['query'] : '';
    $fragment  = isset($url_parts['fragment']) ? $url_parts['fragment'] : '';

$path_with_query = $path;
if (!empty($query))    $path_with_query .= '?' . $query;
if (!empty($fragment)) $path_with_query .= '#' . $fragment;

if (!in_array($scheme, array('ws', 'wss'))) {
  throw new BadUriException(
    "Url should have scheme ws or wss, not '$scheme' from URI '$this->socket_uri' ."
  );
}

$host_uri = ($scheme === 'wss' ? 'ssl' : 'tcp') . '://' . $host;

// Open the socket.  @ is there to supress warning that we will catch in check below instead.
$this->socket = @fsockopen($host_uri, $port, $errno, $errstr, $this->options['timeout']);

if ($this->socket === false) {
  throw new ConnectionException(
    "Could not open socket to \"$host:$port\": $errstr ($errno)."
  );
}

// Set timeout on the stream as well.
stream_set_timeout($this->socket, $this->options['timeout']);

// Generate the WebSocket key.
$key = self::generateKey();

// Default headers (using lowercase for simpler array_merge below).
$headers = array(
  'host'                  => $host . ":" . $port,
  'user-agent'            => 'websocket-client-php',
  'connection'            => 'Upgrade',
  'upgrade'               => 'websocket',
  'origin'               =>  $MY_CUSTOM_SHADY_VALUE,
  'sec-websocket-key'     => $key,
  'sec-websocket-version' => '13',
);

// Handle basic authentication.
if ($user || $pass) {
  $headers['authorization'] = 'Basic ' . base64_encode($user . ':' . $pass) . "\r\n";
}

// Deprecated way of adding origin (use headers instead).
if (isset($this->options['origin'])) $headers['origin'] = $this->options['origin'];

// Add and override with headers from options.
if (isset($this->options['headers'])) {
  $headers = array_merge($headers, array_change_key_case($this->options['headers']));
}

$header =
  "GET " . $path_with_query . " HTTP/1.1\r\n"
  . implode(
    "\r\n", array_map(
      function($key, $value) { return "$key: $value"; }, array_keys($headers), $headers
    )
  )
  . "\r\n\r\n";

// Send headers.
$this->write($header);

// Get server response.
$response = '';
do {
  $buffer = stream_get_line($this->socket, 1024, "\r\n");
  $response .= $buffer . "\n";
  $metadata = stream_get_meta_data($this->socket);
} while (!feof($this->socket) && $metadata['unread_bytes'] > 0);

/// @todo Handle version switching

// Validate response.
if (!preg_match('#Sec-WebSocket-Accept:\s(.*)$#mUi', $response, $matches)) {
  $address = $scheme . '://' . $host . $path_with_query;
  throw new ConnectionException(
    "Connection to '{$address}' failed: Server sent invalid upgrade response:\n"
    . $response
  );
}

$keyAccept = trim($matches[1]);
$expectedResonse
  = base64_encode(pack('H*', sha1($key . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11')));

if ($keyAccept !== $expectedResonse) {
  throw new ConnectionException('Server sent bad upgrade response.');
}

$this->is_connected = true;

}

Answer 4

一个好的解决方案是用另一个 websocket 库覆盖 WebSocket 调用，例如 https://github.com/websockets/ws. To use this node.js library in a browser, you just have to use http://browserify.org/。

如何从 Javascript 设置 WebSocket Origin Header？

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