Hessian接口调用时的DSA 加密(转)

转载只是为了学习，我还得试一下行不行。呵呵。
来源：http://dingjob.iteye.com/blog/689073

   我们经常会使用hessian接口，但是hessian接口默认的情况下是不会进行加密的，原来在项目中使用了MD5的加密，这次希望通过DSA 加密解决 C- S的安全通讯，一方面确定客户端是有权限调用的（给出了publicKey），另一方面保证传输的数据安全

  基本思路就是采用 新的HessianProxyFactory和 HessianServiceExporter 代替原来的发送和接收端，发送请求时进行私钥加密，接收时进行公钥的解密。

  基本逻辑实现如下：

/** 
 * 实现带加密功能的hessian client 
 *  
 * <pre> 
 * 结合spring hessian使用,使用DSAHessianProxyFactory替换默认的HessianProxyFactory 
 * &lt;bean id=&quot;heessianClient&quot; class=&quot;org.springframework.remoting.caucho.HessianProxyFactoryBean&quot;&gt; 
 *      &lt;property name=&quot;proxyFactory&quot;&gt; 
 *          &lt;bean class=&quot;com.alibaba.pivot.common.hessian.DSAHessianProxyFactory&quot;&gt; 
 *              &lt;property name=&quot;secureKey&quot; value=&quot;xxxxx&quot;/&gt; 
 *          &lt;/bean&gt; 
 *      &lt;/property&gt; 
 * &lt;/bean&gt; 
 * </pre> 
 *  
 * @author job 2010-01-28 上午10:20:01 
 */  
public class DSAHessianProxyFactory extends HessianProxyFactory {  
  
    private static final Logger log = LoggerFactory.getLogger(DSAHessianProxyFactory.class);  
  
    private DSAService          dsaService;  
  
    private String     keyPairName;  
  
    /** 
     * 固定的加密字符串 
     */  
    private String              secureKey;  
  
    protected URLConnection openConnection(URL url) throws IOException {  
        String signature = null;  
        String baseUrl = url.toString();  
        StringBuilder queryBuilder = new StringBuilder();  
        queryBuilder.append(baseUrl);  
  
        // 生成时间戳  
        long timestamp = System.currentTimeMillis();  
        // 生成方法签名  
        try {  
            signature = dsaService.sign(secureKey + "|" + Long.toString(timestamp), keyPairName);  
        } catch (NoSuchKeyPairException ne) {  
            log.error("error in DSAHessianProxyFactory.openConnection,no such key" + keyPairName, ne);  
        } catch (DSAException de) {  
            log.error("error in DSAHessianProxyFactory.openConnection,DSA sign error" + keyPairName, de);  
        }  
        if (!"?".equals(queryBuilder.charAt(queryBuilder.length() - 1))) {  
            queryBuilder.append("?");  
        }  
  
        queryBuilder.append("sign=");  
        if (signature != null) {  
            queryBuilder.append(StringEscapeUtil.escapeURL(signature));  
        }  
        queryBuilder.append("&time=");  
        queryBuilder.append(timestamp);  
        URL secureUrl = new URL(queryBuilder.toString());  
  
        URLConnection conn = secureUrl.openConnection();  
  
        conn.setDoOutput(true);  
  
        if (getReadTimeout() > 0) {  
            try {  
                conn.setReadTimeout((int) getReadTimeout());  
            } catch (Throwable e) {  
            }  
        }  
        // 设置自定义的content-type  
        conn.setRequestProperty("Content-Type", "application/octet-stream");  
  
        return conn;  
    }  

输出时的加密：

 
/** 
 * 处理加密的hessian server, 代码来自pivot-p4p 
 *  
 * <pre> 
 * 1. timeout 设置超时时间,单位秒. (客户端会在每次请求中添加时间戳,如果设置了该值,就会进行对客户端请求时间是否超时进行验证) 
 * 2. secureKey 服务端密钥串 (如果设置了该值,就会进行对客户端请求加密串进行验证) 
 * 3. allowedClients 客户端IP验证 (如果设置了该值,就会进行对客户端请求IP进行验证) 
 * </pre> 
 *  
 * @author job 2010-01-28 上午09:53:02 
 */  
public class DSAHessianServiceExporter extends HessianServiceExporter {  
  
    private static Logger log = LoggerFactory.getLogger(DSAHessianServiceExporter.class);  
  
    /** 请求过期时间 **/  
    private long          timeout;  
    /** 令牌原文 **/  
    private String        secureKey;  
    /** 允许访问的客户端 **/  
    private String        allowedClients;  
    /** dsa 加密服务 **/  
    private DSAService    dsaService;  
    /** 密钥名称 **/  
    private String        keyPairName;  
  
    public void handleRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException,  
                                                                                       IOException {  
        // 1.如果设置了允许的IP地址，需要进行客户端IP地址验证  
        if (StringUtil.isNotBlank(allowedClients)) {  
            String clientIP = getClientIPAddress(request);  
            if (!isAllowedClient(clientIP)) {  
                log.error("hessian authentication error:" + clientIP + " not in allowedList " + allowedClients);  
                return;  
            }  
        }  
  
        // 2.如果设置了令牌或者过期时间，需要判断时间格式是否合法  
        String strTimestamp = request.getParameter("time");  
        long timestamp = 0;  
        if (timeout > 0 || StringUtil.isNotBlank(secureKey)) {  
            if (strTimestamp == null) {  
                log.error("hessian authentication error:timestamp not exist!");  
                return;  
            }  
            try {  
                timestamp = Long.parseLong(strTimestamp);  
            } catch (NumberFormatException e) {  
                log.error("hessian authentication error:timestamp is not number!");  
                return;  
            }  
        }  
  
        // 3.如果设置了过期时间，需要判断请求是否过期  
        if (timeout > 0) {  
            // 判断请求是否过期  
            if (isRequestExpired(timestamp)) {  
                log.error("hessian authentication error:request is expired!");  
                return;  
            }  
        }  
  
        // 4. 如果设置了令牌，需要进行签名校验  
        if (StringUtil.isNotBlank(secureKey)) {  
            // 4.1 得到签名  
            String signature = request.getParameter("sign");  
            if (signature == null) {  
                log.error("hessian authentication error:signatures not exist!");  
                return;  
            }  
            try {  
                // 4.2 验证签名是否一致  
                boolean isRight = dsaService.check(secureKey + "|" + timestamp, signature, keyPairName);  
                if (!isRight) {  
                    log.error("hessian authentication error:signatures not match!");  
                    return;  
                }  
            } catch (NoSuchKeyPairException ne) {  
                log.error("error in DSAHessianServiceExporter.handleRequest,no such key" + keyPairName, ne);  
            } catch (DSAException de) {  
                log.error("error in DSAHessianServiceExporter.handleRequest,DSA sign error", de);  
            }  
  
        }  
        // 5. 设置hessian context-type  
        response.setContentType("application/octet-stream");  
        super.handleRequest(request, response);  
    }