跨服务器登录验证(单点登录SSO)的过程和Java实现

如果我们的网站需要和另一个域名做统一认证，也就是在我们网站登录，但真正的功能却在另一个网站来提供。许多都以 passport 的方式。



整个认证可以分三步完成



第一步：本地验证

这个很简单，输入本地的用户名和密码，然后服务器认证通过，并返回正确的Cookie;



第二步：做远程认证，并返回远程连接

通过本地Cookie,确认用户合法性，然后服务器端调用远程的登录程序，返回一个远程认证号的URL,这个URL里面包含了一个唯一的认证码，使用Location的方式



第三步：远程登录

客户端使用前一步的URL,访问远程的服务器，服务器确认认证码的正确性，再返回正确的远程Cookie.



至此，本地认证，通过一个URL,实现了远程认证。



以下是师范代码，是Verycd的武林英雄的认证过程，其登录服务是verycd提供的，而真实服务时9wee提供的。

package org.javaren.hero;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;
import java.net.URLEncoder;
import java.util.Scanner;
/**
 * 跨服务器登录验证(单点登录SSO)的过程和Java实现
 * 
 * @author J***A世纪网(java2000.net, laozizhu.com)
 */
public class Login {
  public static String getCookie() {
    System.out.print("输入用户名:");
    Scanner in = new Scanner(System.in);
    String username = in.next();
    System.out.print("输入密码:");
    String password = in.next();
    try {
      // 本地认证
      String cookie = postLogin(username, password);
      if (cookie == null) {
        return null;
      }
      // 服务器远程认证
      String url = getLogin2(cookie);
      if (url == null) {
        return null;
      }
      // 远程访问认证
      String cookie2 = getLogin3(url.substring("http://s4.verycd.9wee.com".length()));
      // System.out.println(cookie2);
      return cookie2;
    } catch (Exception ex) {
      ex.printStackTrace();
      return null;
    }
  }
  private static String postLogin(String username, String password) throws Exception {
    Socket socket = new Socket("secure.verycd.com", 80);
    try {
      StringBuilder sb = new StringBuilder();
      sb.append("POST /signin?f=out HTTP/1.1/r/n");
      sb.append("Host: secure.verycd.com/r/n");
      sb.append("User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3/r/n");
      sb.append("Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8/r/n");
      sb.append("Accept-Language: zh-cn,zh;q=0.5/r/n");
      sb.append("Accept-Encoding: gzip,deflate/r/n");
      sb.append("Accept-Charset: GB2312,utf-8;q=0.7,*;q=0.7/r/n");
      sb.append("Referer: http://secure.verycd.com/3rdServices/50hero/r/n");       sb.append("Content-Type: application/x-www-form-urlencoded/r/n");
      String data = "ru=http%3A%2F%2Fsecure.verycd.com%2F3rdServices%2F50hero&login_submit=%E7%99%BB%E5%BD%95&username="
          + URLEncoder.encode(username, "UTF-8") + "&password=" + URLEncoder.encode(password, "UTF-8");
      sb.append("Content-Length: " + data.getBytes("UTF-8").length + "/r/n");
      sb.append("/r/n");
      sb.append(data);
      OutputStream os = socket.getOutputStream();
      os.write(sb.toString().getBytes("UTF-8"));
      os.flush();
      InputStream is = socket.getInputStream();
      BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8")); // 读取结果
      String line;
      StringBuilder cookieSb = new StringBuilder();
      int index;
      while ((line = reader.readLine()) != null) {
        if (line.startsWith("Set-Cookie:")) {
          if (!line.contains("=deleted;")) {
            index = line.indexOf(";");
            if (index > 12) {
              cookieSb.append(line.substring(12, index + 1));
            }
          }
        } else if (line.startsWith("location:")) {
          if (line.contains("error_code")) {
            return null;
          }
        }
      }
      is.close();
      reader.close();
      return cookieSb.toString();
    } finally {
      socket.close();
    }
  }
  private static String getLogin2(String cookie) throws Exception {
    Socket socket = new Socket("secure.verycd.com", 80);
    try {
      StringBuilder sb = new StringBuilder();
      sb.append("GET /signin?ak=50hero&ru=http%3A%2F%2Fs4.verycd.9wee.com%2Fpassport.php HTTP/1.1/r/n");
      sb.append("Host: secure.verycd.com/r/n");
      sb.append("User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3/r/n");
      sb.append("Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8/r/n");
      sb.append("Accept-Language: zh-cn,zh;q=0.5/r/n");
      sb.append("Accept-Encoding: gzip,deflate/r/n");
      sb.append("Accept-Charset: GB2312,utf-8;q=0.7,*;q=0.7/r/n");
      sb.append("Referer: http://secure.verycd.com/3rdServices/50hero/r/n");       sb.append("Cookie: " + cookie + "/r/n");
      sb.append("/r/n");
      OutputStream os = socket.getOutputStream();
      os.write(sb.toString().getBytes("UTF-8"));
      os.flush();
      InputStream is = socket.getInputStream();
      BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8")); // 读取结果
      String line;
      while ((line = reader.readLine()) != null) {
        if (line.startsWith("location:")) {
          return line.substring(10);
        }
      }
      is.close();
      reader.close();
      return null;
    } finally {
      socket.close();
    }
  }
  private static String getLogin3(String url) throws Exception {
    Socket socket = new Socket("s4.verycd.9wee.com", 80);
    try {
      StringBuilder sb = new StringBuilder();
      sb.append("GET " + url + " HTTP/1.1/r/n");
      sb.append("Host: s4.verycd.9wee.com/r/n");
      sb.append("User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3/r/n");
      sb.append("Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8/r/n");
      sb.append("Accept-Language: zh-cn,zh;q=0.5/r/n");
      sb.append("Accept-Encoding: gzip,deflate/r/n");
      sb.append("Accept-Charset: GB2312,utf-8;q=0.7,*;q=0.7/r/n");
      sb.append("Referer: http://secure.verycd.com/3rdServices/50hero/r/n");       sb.append("/r/n/r/n");
      OutputStream os = socket.getOutputStream();
      os.write(sb.toString().getBytes("UTF-8"));
      os.flush();
      InputStream is = socket.getInputStream();
      BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8")); // 读取结果
      String line;
      StringBuilder cookieSb = new StringBuilder();
      int index;
      while ((line = reader.readLine()) != null) {
        if (line.length() == 0) {
          break;
        }
        if (line.startsWith("Set-Cookie:")) {
          index = line.indexOf(";");
          if (index > 12) {
            cookieSb.append(line.substring(12, index + 1));
          }
        }
      }
      is.close();
      reader.close();
      return cookieSb.toString();
    } finally {
      socket.close();
    }
  }
}