node.js中的HTTPS代理服务器

Question

我正在开发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).

我目前正在使用node-http-proxy这样的:

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);

我设置我的浏览器使用HTTP代理localhost:8000,它的工作原理.我还想捕获HTTPS请求(即设置我的浏览器以localhost:8000用作HTTPS代理并在我的应用程序中捕获请求).你能帮帮我怎么办？

PS:

如果我订阅upgrade了httpProxy服务器对象的事件,我可以获得请求,但我不知道如何转发请求并向客户端发送响应:

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

解决方案几乎不存在,并且文档在一台服务器上支持两者最好.这里的技巧是了解客户端代理配置可以将https请求发送到http代理服务器.如果您指定HTTP代理然后选中"对所有协议都相同",则适用于Firefox.

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connect事件上的响应对象,只能访问套接字和bodyhead.通过此套接字发送的数据将作为代理服务器保持加密状态.

在此解决方案中,您不必创建自己的证书,因此不会出现证书冲突.流量只是代理,而不是截获,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 2

这是我的NO-dependencies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!).我输入了运行此代码的机器的IP地址和9191端口,如代码中所示.我还设置了"为所有协议使用此代理服务器".我在本地和VPS上运行此代码 - 两种情况都有效!

您可以使用curl测试NodeJS代理:

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

Answer 3

我已经借助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 4

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