CAS3.0 定制验证

Joshua 2006-02-20

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[原创]CAS3.0 定制验证

前言:

CAS v2 定制自己的验证逻辑,大家已经很清楚了.[官方提供的sample只简单校验username,password是否相等].开发者可以通过实现PasswordHandler接口来使用其它的认证方式，如数据库用户的用户名和密码匹配认证，数字签名的验证，操作系统用户认证，以及LDAP用户认证等模式。比如:

        <context-param>
        <param-name>edu.yale.its.tp.cas.authHandler</param-name>
        <param-value>
             edu.yale.its.tp.cas.auth.provider.KerberosAuthHandler
        </param-value>
    </context-param>

改变:

Yale CAS3代码全部重构,功能增强,且使用了Spring和SpringWebFlow[相关知识参见Spring论坛].

涉及点分析:

deployerConfigContext.xml是描述部署细节的,他通过web.xml如下描述而加载

      <context-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>
   /WEB-INF/applicationContext.xml,
   /WEB-INF/mydeployerConfigContext.xml
  </param-value>
</context-param>

contextConfigLocation属性名在Spring MVC体系中,会自动获取.

----------------------------

deployerConfigContext.xml文件是所有CAS deployer应该关心的东西,在这里,你可以对CAS的三个核心玩意进行自己的定制:
1.AuthenticationManager


2.credentialsToPrincipalResolvers

3.authenticationHandlers
这个authenticationHandler可是所有CAS用户都需要修改的地方

实现:

思路:没撒子说的,就是实现自己的Hadnle.为了避免重新编译cas代码,使用ant部署自己的jar到目标的lib中,并替换web.xml以及引进自己的配置文件mydeployerConfigContext.xml

步骤:

A:在应用服务器中配置DS[略]

B:修改web.xml

         <context-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>
   /WEB-INF/applicationContext.xml,
   /WEB-INF/mydeployerConfigContext.xml
  </param-value>
</context-param>

C:web.xml加入DS引用

        <resource-ref>
<description>
    Resource reference to a factory for java.sql.Connection
    instances that may be used for talking to a particular
    database that is configured in the server.xml file.
</description>
<res-ref-name>
    jdbc/EmployeeDB
</res-ref-name>
<res-type>
    javax.sql.DataSource
</res-type>
<res-auth>
    Container
</res-auth>
</resource-ref>

D:添加mydeployerConfigContext.xml

内容如下:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www./dtd/spring-beans.dtd">

<property name="authenticationHandlers">
   <list>
    
    <bean
     class="org.jasig.cas.authentication.handler.support.HttpBasedServiceCredentialsAuthenticationHandler" />
    <bean
     class="cn.com.tiansky.cas.authenticationHandlers.DsHandlers" />
   </list>
  </property>
</bean>
</beans>
E:编写DsHandlers

package cn.com.tiansky.cas.authenticationHandlers;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql.DataSource;

import org.apache.log4j.Logger;
import org.jasig.cas.authentication.handler.support.AbstractUsernamePasswordAuthenticationHandler;
import org.jasig.cas.authentication.principal.UsernamePasswordCredentials;

import cn.com.tiansky.tool.MD5;

/**
* 支援CAS3，。实现自己的Handler(未自定义credentials,如因业务需要而修改，则需要同时
* 修改LoginFormAction和定义自己的credentialsToPrincipalResolvers)\
* ,你的需求也许包括了需要通过检索数据库来比配credential中的username和password，
* 也可能不是数据库，而是LDAP什么的，总之你得开始制作自己的handler了！
* credential的种类是很多的，有的基于用户名和密码，有的基于http请求，
* 如果你有你自己的credential的话，就得为它制作有一个handler，
* 来告诉CAS如何处理这种特有的credential。
* @author tiansky
* @version 1.0
*
*/
public final class DsHandlers extends
AbstractUsernamePasswordAuthenticationHandler{

/**
* Logger log:log4j日志
*/
private Logger log=Logger.getLogger(AbstractUsernamePasswordAuthenticationHandler.class);
/**
* 相关的数据库配置DS对应的jndi
*/
private String _jndi="jdbc/EmployeeDB";
/* (non-Javadoc)
* @see org.jasig.cas.authentication.handler.support.AbstractUsernamePasswordAuthenticationHandler#authenticateUsernamePasswordInternal(org.jasig.cas.authentication.principal.UsernamePasswordCredentials)
*/
public boolean authenticateUsernamePasswordInternal(
          final UsernamePasswordCredentials credentials) {
           String username = credentials.getUsername();
           String password = credentials.getPassword();
           log.info("username:"+username);

           log.info("password:"+password);
          try {
     password = MD5.encrypt(password);
     log.debug("md5password" + password);
    } catch (Exception e) {
     log.warn("MD5加密出错", e);
     //throw new Exception("MD5加密出错");
     return false;
    }
    /*
          if (StringUtils.hasText(username) && StringUtils.hasText(password)
              && username.equals(getPasswordEncoder().encode(password))) {
              getLog().debug(
                  "User [" + username + "] was successfully authenticated.");
              return true;
          }
          */
    try
    {
     if(checkuser(username,password)==1)
     {
      getLog().info("认证成功!");
      return true;
     }
    }
    catch(Exception e)
    {
     getLog().error("User [" + username + "] failed authentication",e);
    }

          return false;
      }
private int checkuser(String user, String pwd) throws Exception {
  int rei = 0;
  // Obtain our environment naming context
  log.debug("Obtain our environment naming context");
  Context initCtx = new InitialContext();
  Context envCtx = (Context) initCtx.lookup("java:comp/env");

  // Look up our data source
  DataSource ds = (DataSource) envCtx.lookup(this._jndi);
  log.debug("获取ds成功!");
  // Allocate and use a connection from the pool
  Connection conn = ds.getConnection();
  log.debug("获取conn成功!");
  // ... use this connection to access the database ...
  String sql = "select OPERATORID from operator where OPERATORLOGINNAME=‘"
    + user + "‘ and OPERATORPASSWORD=‘" + pwd + "‘ ";
  log.info("sql!= "+sql);
  Statement st = conn.createStatement();
  ResultSet rs = st.executeQuery(sql);
  if (rs.next()) {
   //String oid = rs.getString("OPERATORID");
   /*
   _op = new Operator(oid);
   _op.setName("操作员");
   _op.setLoginname(user);
   _op.setPwd(pwd);
   */
   rei = 1;
  } else {
   System.out.println("账号不存在或密码错误!");
  }
  conn.close();
  return rei;

}
      /* (non-Javadoc)
       * @see org.jasig.cas.authentication.handler.support.AbstractUsernamePasswordAuthenticationHandler#afterPropertiesSetInternal()
       */
      protected void afterPropertiesSetInternal() throws Exception {
          super.afterPropertiesSetInternal();
          getLog()
              .warn(
                  this.getClass().getName()
                      + " is only to be used in a production environment.");
      }

}

F:ant 发布

G:运行调试

附录:ANT脚本

<?xml version="1.0" encoding="gb2312"?>