Weblogic中通过IdentityAsserter实现SSO
weblogic8实现SSO的一种简单方案，就是通过IdentityAsserter解决。
步骤一、SSO目标配置

<security-constraint>    <web-resource-collection>      <web-resource-name>Protected Area</web-resource-name>      <url-pattern>*.jsp</url-pattern>      <url-pattern>*.do</url-pattern>      <url-pattern>*.html</url-pattern>      <url-pattern>*.htm</url-pattern>           <url-pattern>*.doc</url-pattern>      <url-pattern>*.xls</url-pattern>       <url-pattern>*.xlsx</url-pattern>      <url-pattern>*.zip</url-pattern>      <url-pattern>*.rar</url-pattern>      <url-pattern>*.jpg</url-pattern>    </web-resource-collection>    <auth-constraint>      <role-name>secrole</role-name>    </auth-constraint></security-constraint><login-config>    <auth-method>CLIENT-CERT</auth-method>    <realm-name>myrealm</realm-name></login-config><security-role>    <role-name>secrole</role-name></security-role>

步骤二、创建Identity Assertion Provider
1、产生MDF:ImepIdentityAsserter.xml

<?xml version="1.0" ?><!DOCTYPE MBeanType SYSTEM "commo.dtd"><MBeanType Name = "ImepIdentityAsserter" DisplayName = "ImepIdentityAsserter"Package = "com.huawei.netforce.security.sso"Extends = "weblogic.management.security.authentication.IdentityAsserter"PersistPolicy = "OnUpdate"><MBeanAttribute Name = "ProviderClassName" Type = "java.lang.String"Writeable = "false"Default = ""com.huawei.netforce.security.sso.ImepIdentityAsserterProviderImpl""/><MBeanAttribute Name = "Description" Type = "java.lang.String"Writeable = "false" Default = ""ImepIdentityAsserter Identity Assertion Provider""/><MBeanAttribute Name = "Version" Type = "java.lang.String"Writeable = "false" Default = ""1.0""/><MBeanAttribute Name = "SupportedTypes" Type = "java.lang.String[]"Writeable = "false" Default = "new String[] {"ImepToken"}"/><MBeanAttribute Name = "ActiveTypes" Type = "java.lang.String[]"Default = "new String[] {"ImepToken"}"/></MBeanType>

java -DcreateStubs="true" weblogic.management.commo.WebLogicMBeanMaker -MDF ImepIdentityAsserter.xml -files d:\src

2、创建提供程序实现

import java.io.PrintStream;import javax.security.auth.callback.CallbackHandler;import javax.security.auth.login.AppConfigurationEntry;import weblogic.management.security.ProviderMBean;import weblogic.security.spi.*;public class ImepIdentityAsserterProviderImpl    implements AuthenticationProvider, IdentityAsserter{    private static final String TOKEN_TYPE = "ImepToken";    private static final String TOKEN_PREFIX = "username=";    private String description;    public ImepIdentityAsserterProviderImpl()    {    }    public AppConfigurationEntry getAssertionModuleConfiguration()    {        return null;    }    public IdentityAsserter getIdentityAsserter()    {        return this;    }    public AppConfigurationEntry getLoginModuleConfiguration()    {        return null;    }    public PrincipalValidator getPrincipalValidator()    {        return null;    }    public String getDescription()    {        return description;    }    public void initialize(ProviderMBean mbean, SecurityServices services)    {        System.out.println("ImepIdentityAsserterProviderImpl.initialize");        ImepIdentityAsserterMBean myMBean = (ImepIdentityAsserterMBean)mbean;        description = myMBean.getDescription() + "\n" + myMBean.getVersion();    }    public void shutdown()    {    }    public CallbackHandler assertIdentity(String type, Object token)        throws IdentityAssertionException    {        if(!"ImepToken".equals(type))        {            String error = "ImepIdentityAsserterProviderImpl received unknown token type \"" + type + "\"." + " Expected " + "ImepToken";            throw new IdentityAssertionException(error);        }        if(!(token instanceof byte[]))        {            String error = "ImepIdentityAsserterProviderImpl received unknown token class \"" + token.getClass() + "\"." + " Expected a byte[].";            throw new IdentityAssertionException(error);        }        byte tokenBytes[] = (byte[])token;        if(tokenBytes == null || tokenBytes.length < 1)        {            String error = "ImepIdentityAsserterProviderImpl received empty token byte array";            throw new IdentityAssertionException(error);        }        String tokenStr = new String(tokenBytes);        if(!tokenStr.startsWith("username="))        {            String error = "ImepIdentityAsserterProviderImpl received unknown token string \"" + type + "\"." + " Expected " + "username=" + "username";            throw new IdentityAssertionException(error);        } else        {            String userName = tokenStr.substring("username=".length());            return new ImepCallbackHandlerImpl(userName);        }    }}

import java.io.IOException;import javax.security.auth.callback.*;public class ImepCallbackHandlerImpl    implements CallbackHandler{    private String userName;    public ImepCallbackHandlerImpl(String aUserName)    {        userName = aUserName;    }    public void handle(Callback callbacks[])        throws IOException, UnsupportedCallbackException    {        for(int i = 0; i < callbacks.length; i++)        {            Callback callback = callbacks[i];            if(!(callback instanceof NameCallback))                throw new UnsupportedCallbackException(callback, "Unrecognized Callback");            NameCallback nameCallback = (NameCallback)callback;            nameCallback.setName(userName);        }    }}

3、MJF打包
java weblogic.management.commo.WebLogicMBeanMaker -MJF ImepIdentityProvider.jar -files d:\src

4、服务端配置
把这个提供程序（ImepIdentityProvider.jar）复制到WL_HOME/server/lib/mbeantypes目录下，然后重新启动服务器。启动管理控制台，并导航到Security/myrealm Providers/Authentication节点。在可用验证器和身份确认器的列表中，应该可以找到“Configure a new ImepIdentityAsserter...”选项。选择这个选项并点击Create，就可以配置身份确认器了。在接下来的选项卡中，您将会注意到，支持的令牌类型被设置为ImepToken和对于ImepToken是活动的令牌。现在，必须重新启动服务器，从而使修改生效。

步骤三、测试
1、URLConnection测试

    try    {        //test账户需要在myrealm中进行配置        String token = "username=test";        //是否需要编码可在控制台配置时取消，默认为BASE64编码        BASE64Encoder encoder = new BASE64Encoder();        String encodedToken = encoder.encodeBuffer(token.getBytes());         URL url = new URL("http://localhost:7001/app/index.jsp");        URLConnection connection = url.openConnection();        connection.setRequestProperty("ImepToken",encodedToken);        BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));        String line = "";        while((line = in.readLine()) != null)        {            System.out.println(line);        }    }    catch(Exception e)    {        e.printStackTrace();    }

2、SSO源测试
由于IdentityAsserter需要客户端提供令牌，故在请求SSO目标应用时，需要在cookie中增加ImepToken属性
SSO目标在接收token并redirect的servlet代码片段为：

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException    {        this.doPost(request, response);    }    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException    {        String tokenValue = request.getParameter("token");        String redirect = request.getParameter("redirect");        if(StringUtils.isNotEmpty(tokenValue))        {            //IdentityAsserterProvider从cookie或者header中取token            Cookie cookie = new Cookie("ImepToken", tokenValue);            response.addCookie(cookie);            response.setHeader("ImepToken",tokenValue);            //添加P3P策略主要解决iframe集成时浏览器阻止跨域cookie            response.setHeader("P3P","CP=CAO PSA OUR");            response.sendRedirect(redirect);        }    }