CAS3.0 定制验证

[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:

edu.yale.its.tp.cas.authHandler

edu.yale.its.tp.cas.auth.provider.KerberosAuthHandler


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

contextConfigLocation

/WEB-INF/applicationContext.xml,
/WEB-INF/mydeployerConfigContext.xml


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

contextConfigLocation

/WEB-INF/applicationContext.xml,
/WEB-INF/mydeployerConfigContext.xml


C:web.xml加入DS引用


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.


jdbc/EmployeeDB


javax.sql.DataSource


Container


D:添加mydeployerConfigContext.xml
内容如下:




class="org.jasig.cas.authentication.AuthenticationManagerImpl">




class="org.jasig.cas.authentication.principal.UsernamePasswordCredentialsToPrincipalResolver" />

class="org.jasig.cas.authentication.principal.HttpBasedServiceCredentialsToPrincipalResolver" />






class="org.jasig.cas.authentication.handler.support.HttpBasedServiceCredentialsAuthenticationHandler" />
class="cn.com.tiansky.cas.authenticationHandlers.DsHandlers" />




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("帐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























basedir="."
includes="**/*.class"
/>






















classpath="hello.jar"
fork="true"
/>