node.js 中的 HTTPS 代理服务器

Question

我正在开发一个node.js 代理服务器应用程序，我希望它支持HTTP 和HTTPS(SSL) 协议（作为服务器）。

我目前正在像这样使用node-http-proxy：

const httpProxy = require('http-proxy'),
      http = require('http');

var server = httpProxy.createServer(9000, 'localhost', function(req, res, proxy) {
    console.log(req.url);
    proxy.proxyRequest(req, res);
});

http.createServer(function(req, res) {
    res.end('hello!');
}).listen(9000);

server.listen(8000);

我将我的浏览器设置为在localhost:8000 上使用HTTP 代理，它可以工作。我还想捕获HTTPS 请求（即设置我的浏览器以使用localhost:8000 作为HTTPS 代理，并在我的应用程序中捕获请求）。你能帮我怎么做吗？

PS：

如果我订阅httpProxy 服务器对象的upgrade 事件，我可以获得请求，但我不知道如何转发请求并将响应发送给客户端：

server.on('upgrade', function(req, socket, head) {
    console.log(req.url);
    // I don't know how to forward the request and send the response to client
});

任何帮助将不胜感激。

Answer 1

node-http-proxy 文档包含这方面的示例。在https://github.com/nodejitsu/node-http-proxy 处查找“从 HTTPS 代理到 HTTPS”每个浏览器的配置过程都略有不同。有些人可以选择将您的代理设置用于所有协议；有些需要单独配置 SSL 代理。

Answer 2

我借助 http-proxy 模块创建了一个 http/https 代理：https://gist.github.com/ncthis/6863947

截至目前的代码：

var fs = require('fs'),
  http = require('http'),
  https = require('https'),
  httpProxy = require('http-proxy');

var isHttps = true; // do you want a https proxy?

var options = {
  https: {
    key: fs.readFileSync('key.pem'),
    cert: fs.readFileSync('key-cert.pem')
  }
};

// this is the target server
var proxy = new httpProxy.HttpProxy({
  target: {
    host: '127.0.0.1',
    port: 8080
  }
});

if (isHttps)
  https.createServer(options.https, function(req, res) {
    console.log('Proxying https request at %s', new Date());
    proxy.proxyRequest(req, res);
  }).listen(443, function(err) {
    if (err)
      console.log('Error serving https proxy request: %s', req);

    console.log('Created https proxy. Forwarding requests from %s to %s:%s', '443', proxy.target.host, proxy.target.port);
  });
else
  http.createServer(options.https, function(req, res) {
    console.log('Proxying http request at %s', new Date());
    console.log(req);
    proxy.proxyRequest(req, res);
  }).listen(80, function(err) {
    if (err)
      console.log('Error serving http proxy request: %s', req);

    console.log('Created http proxy. Forwarding requests from %s to %s:%s', '80', proxy.target.host, proxy.target.port);
  });

Answer 3

解决方案几乎不存在，并且文档充其量只能在一台服务器上支持 both。这里的技巧是了解客户端代理配置可能会将 https 请求发送到 http 代理服务器。如果您指定 HTTP 代理，然后选中“所有协议相同”，则对于 Firefox 也是如此。

您可以通过侦听“connect”事件来处理发送到 HTTP 服务器的 https 连接。请注意，您将无法访问连接事件的响应对象，只能访问套接字和 bodyhead。作为代理服务器，通过此套接字发送的数据将保持加密状态。

在此解决方案中，您不必制作自己的证书，因此不会出现证书冲突。流量只是被代理，不会被截获并用不同的证书重写。

//  Install npm dependencies first
//  npm init
//  npm install --save url@0.10.3
//  npm install --save http-proxy@1.11.1

var httpProxy = require("http-proxy");
var http = require("http");
var url = require("url");
var net = require('net');

var server = http.createServer(function (req, res) {
  var urlObj = url.parse(req.url);
  var target = urlObj.protocol + "//" + urlObj.host;

  console.log("Proxy HTTP request for:", target);

  var proxy = httpProxy.createProxyServer({});
  proxy.on("error", function (err, req, res) {
    console.log("proxy error", err);
    res.end();
  });

  proxy.web(req, res, {target: target});
}).listen(8080);  //this is the port your clients will connect to

var regex_hostport = /^([^:]+)(:([0-9]+))?$/;

var getHostPortFromString = function (hostString, defaultPort) {
  var host = hostString;
  var port = defaultPort;

  var result = regex_hostport.exec(hostString);
  if (result != null) {
    host = result[1];
    if (result[2] != null) {
      port = result[3];
    }
  }

  return ( [host, port] );
};

server.addListener('connect', function (req, socket, bodyhead) {
  var hostPort = getHostPortFromString(req.url, 443);
  var hostDomain = hostPort[0];
  var port = parseInt(hostPort[1]);
  console.log("Proxying HTTPS request for:", hostDomain, port);

  var proxySocket = new net.Socket();
  proxySocket.connect(port, hostDomain, function () {
      proxySocket.write(bodyhead);
      socket.write("HTTP/" + req.httpVersion + " 200 Connection established\r\n\r\n");
    }
  );

  proxySocket.on('data', function (chunk) {
    socket.write(chunk);
  });

  proxySocket.on('end', function () {
    socket.end();
  });

  proxySocket.on('error', function () {
    socket.write("HTTP/" + req.httpVersion + " 500 Connection error\r\n\r\n");
    socket.end();
  });

  socket.on('data', function (chunk) {
    proxySocket.write(chunk);
  });

  socket.on('end', function () {
    proxySocket.end();
  });

  socket.on('error', function () {
    proxySocket.end();
  });

});

Answer 4

这是我的无依赖解决方案（纯 NodeJS 系统库）：

const http = require('http')
const port = process.env.PORT || 9191
const net = require('net')
const url = require('url')

const requestHandler = (req, res) => { // discard all request to proxy server except HTTP/1.1 CONNECT method
  res.writeHead(405, {'Content-Type': 'text/plain'})
  res.end('Method not allowed')
}

const server = http.createServer(requestHandler)

const listener = server.listen(port, (err) => {
  if (err) {
    return console.error(err)
  }
  const info = listener.address()
  console.log(`Server is listening on address ${info.address} port ${info.port}`)
})

server.on('connect', (req, clientSocket, head) => { // listen only for HTTP/1.1 CONNECT method
  console.log(clientSocket.remoteAddress, clientSocket.remotePort, req.method, req.url)
  if (!req.headers['proxy-authorization']) { // here you can add check for any username/password, I just check that this header must exist!
    clientSocket.write([
      'HTTP/1.1 407 Proxy Authentication Required',
      'Proxy-Authenticate: Basic realm="proxy"',
      'Proxy-Connection: close',
    ].join('\r\n'))
    clientSocket.end('\r\n\r\n')  // empty body
    return
  }
  const {port, hostname} = url.parse(`//${req.url}`, false, true) // extract destination host and port from CONNECT request
  if (hostname && port) {
    const serverErrorHandler = (err) => {
      console.error(err.message)
      if (clientSocket) {
        clientSocket.end(`HTTP/1.1 500 ${err.message}\r\n`)
      }
    }
    const serverEndHandler = () => {
      if (clientSocket) {
        clientSocket.end(`HTTP/1.1 500 External Server End\r\n`)
      }
    }
    const serverSocket = net.connect(port, hostname) // connect to destination host and port
    const clientErrorHandler = (err) => {
      console.error(err.message)
      if (serverSocket) {
        serverSocket.end()
      }
    }
    const clientEndHandler = () => {
      if (serverSocket) {
        serverSocket.end()
      }
    }
    clientSocket.on('error', clientErrorHandler)
    clientSocket.on('end', clientEndHandler)
    serverSocket.on('error', serverErrorHandler)
    serverSocket.on('end', serverEndHandler)
    serverSocket.on('connect', () => {
      clientSocket.write([
        'HTTP/1.1 200 Connection Established',
        'Proxy-agent: Node-VPN',
      ].join('\r\n'))
      clientSocket.write('\r\n\r\n') // empty body
      // "blindly" (for performance) pipe client socket and destination socket between each other
      serverSocket.pipe(clientSocket, {end: false})
      clientSocket.pipe(serverSocket, {end: false})
    })
  } else {
    clientSocket.end('HTTP/1.1 400 Bad Request\r\n')
    clientSocket.destroy()
  }
})

我用 Firefox 代理设置测试了这段代码（它甚至要求输入用户名和密码！）。如您在代码中看到的，我输入了运行此代码的机器的 IP 地址和 9191 端口。我还设置了“将此代理服务器用于所有协议”。我在本地和 VPS 上运行此代码 - 在这两种情况下都有效！

您可以使用 curl 测试您的 NodeJS 代理：

curl -x http://username:password@127.0.0.1:9191 https://www.google.com/