WebService CXF学习（高级篇3）：WS-Security

 这一节我们来探讨一下WebService安全问题，如果所有系统都运行在一个封闭的局域网内，那么可以不考虑网络攻击，拒绝服务，消息篡改，窃取等问题。但通常情况都接入互联网，那么我就得考虑信息安全问题，像前面那样直接将消息裸传，肯定不行。那么，我们就得给消息加密。CXF可以结合WSS4J来对消息安全进行管理，可以使用令牌，X.509认证对消息头或内容进行加密。这节我只对令牌加密做一个简单的描述，我们还以Demo的形式来讲解一下。 
    这个Demo是在CXF+Spring+Hibernate的基础修改而成。在这里我只针对修改的东西进行讲解。 

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:jaxws="http://cxf.apache.org/jaxws"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
        http://cxf.apache.org/jaxws
        http://cxf.apache.org/schemas/jaxws.xsd">
    <import resource="classpath:META-INF/cxf/cxf.xml" />
    <import resource="classpath:META-INF/cxf/cxf-extension-soap.xml" />
    <import resource="classpath:META-INF/cxf/cxf-servlet.xml" />


    <jaxws:endpoint id="service"
        implementor="com.itdcl.service.ServiceImpl" address="/Service">
        <jaxws:inInterceptors>
            <bean
                class="org.apache.cxf.interceptor.LoggingInInterceptor" />
            <bean
                class="org.apache.cxf.binding.soap.saaj.SAAJInInterceptor" />
            <bean
                class="org.apache.cxf.ws.security.wss4j.WSS4JInInterceptor">
                <constructor-arg>
                    <map>
                        <entry key="action" value="UsernameToken" />
                        <entry key="passwordType"
                            value="PasswordText" />
                        <entry key="user" value="cxfServer" />
                        <entry key="passwordCallbackRef">
                            <ref bean="serverPasswordCallback" />
                        </entry>
                    </map>
                </constructor-arg>
            </bean>
        </jaxws:inInterceptors>
    </jaxws:endpoint>

    <bean id="serverPasswordCallback"
        class="com.itdcl.ws.ServerPasswordCallback" />

</beans>

    action:UsernameToken指使用用户令牌 
    passwordType:PasswordText指密码加密策略，这里直接文本 
    user:cxfServer指别名 
    passwordCallBackRef:serverPasswordCallback指消息验证 

    消息验证类：

package com.itdcl.ws;

import java.io.IOException;

import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.UnsupportedCallbackException;

import org.apache.ws.security.WSPasswordCallback;

public class ServerPasswordCallback implements CallbackHandler {

    public void handle(Callback[] callbacks) throws IOException,
            UnsupportedCallbackException {
        WSPasswordCallback pc = (WSPasswordCallback) callbacks[0];
        String pw = pc.getPassword();
        String idf = pc.getIdentifier();
        System.out.println("password:"+pw);
        System.out.println("identifier:"+idf);
        if (pw.equals("josen") && idf.equals("admin")) {
            // 验证通过
        } else {
            throw new SecurityException("验证失败");
        }
    }

}

     消息验证类通过实现CallbackHandler接口，实现handle方法来进行用户认证。 

     那么，客户端又怎样来验证消息是否确呢。

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:jaxws="http://cxf.apache.org/jaxws"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
        http://cxf.apache.org/jaxws
        http://cxf.apache.org/schemas/jaxws.xsd">

    <jaxws:client id="service"
        address="http://localhost:9999/cxf/Service"
        serviceClass="com.itdcl.service.IService">
        <jaxws:outInterceptors>
            <bean
                class="org.apache.cxf.interceptor.LoggingOutInterceptor" />
            <bean
                class="org.apache.cxf.binding.soap.saaj.SAAJOutInterceptor" />
            <bean
                class="org.apache.cxf.ws.security.wss4j.WSS4JOutInterceptor">
                <constructor-arg>
                    <map>
                        <entry key="action" value="UsernameToken" />
                        <entry key="passwordType"
                            value="PasswordText" />
                        <entry key="user" value="cxfClient" />
                        <entry key="passwordCallbackRef">
                            <ref bean="clientPasswordCallback" />
                        </entry>
                    </map>
                </constructor-arg>
            </bean>
        </jaxws:outInterceptors>
    </jaxws:client>

    <bean id="clientPasswordCallback"
        class="com.itdcl.ws.ClientPasswordCallback" />
</beans>

    客户端在发送SOAP时对消息对认证，策略跟服务端一样。但是认证类有所区别：

package com.itdcl.ws;

import java.io.IOException;

import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.UnsupportedCallbackException;

import org.apache.ws.security.WSPasswordCallback;

public class ClientPasswordCallback implements CallbackHandler {

    public void handle(Callback[] callbacks) throws IOException,
            UnsupportedCallbackException {
        for(int i=0;i<callbacks.length;i++)
        {
             WSPasswordCallback pc = (WSPasswordCallback)callbacks[i];
             pc.setPassword("josen");
             pc.setIdentifier("admin");
        }
    }

}

     客户端在发送消息，设置好用户名和密码。服务端用相应的用户名和密码进行验证。 

     令牌验证就如此简单。