CAS （ Central Authentication Service ） 是 Yale 大学发起的一个企业级的、开源的项目，旨在为 Web 应用系统提供一种可靠的单点登录解决方法（属于 Web SSO ）。CAS集群部署首先需要考虑的是ticket票据统一存储的问题，以便于达到每个节点访问的一致性，官方虽然提供了基于memcached方式，但未提供基于Redis方式，项目中需要使用redis，因此仿照memcached方式，新建cas-server-integration-redis工程，来完成工作需求，下面本站素文宅www.yoodb.com就分享一下CAS集群部署基于Redis缓存配置，仅供大家参考学习。
主要特性，具体如下：
1）开源的、多协议的 SSO 解决方案； Protocols ： Custom Protocol 、 CAS 、 OAuth 、 OpenID 、 RESTful API 、 SAML1.1 、 SAML2.0 等。
2）支持多种认证机制： Active Directory 、 JAAS 、 JDBC 、 LDAP 、 X.509 Certificates 等；
3）安全策略：使用票据（ Ticket ）来实现支持的认证协议；
4）支持授权：可以决定哪些服务可以请求和验证服务票据（ Service Ticket ）；
5） 提 供高可用性：通过把认证过的状态数据存储在 TicketRegistry 组件中，这些组件有很多支持分布式环境的实现， 如： BerkleyDB 、 Default 、 EhcacheTicketRegistry 、 JDBCTicketRegistry 、 JBOSS TreeCache 、 JpaTicketRegistry 、 MemcacheTicketRegistry 等；
6）支持多种客户端： Java 、 .Net 、 PHP 、 Perl 、 Apache, uPortal 等。
1、构建cas-server-integration-redis工程
仿照cas-server-integration-memcached工程建立cas-server-integration-redis工程，pom.xml中添加redis的java客户端jar包，去掉memcached中需要的jar，最后依赖包如下：
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<parent>
<groupId>org.jasig.cas</groupId>
<artifactId>cas-server</artifactId>
<version>3.5.2</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>org.jasig.cas</groupId>
<artifactId>cas-server-integration-redis</artifactId>
<packaging>jar</packaging>
<name>Jasig CAS Redis Integration</name>
<dependencies>
<dependency>
<groupId>org.jasig.cas</groupId>
<artifactId>cas-server-core</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.8.1</version>
</dependency> <!-- Test dependencies -->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-redis</artifactId>
<version>1.7.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<version>1.9.0</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>仿照MemCacheTicketRegistry.java类，定义RedisTicketRegistry.java类，此类是核心，它实现了TicketRegistry接口，具体代码如下：
public class RedisTicketRegistry extends AbstractDistributedTicketRegistry{
@NotNull
private final RedisTemplate<String,Object> reidsTemplate;
/**
* TGT cache entry timeout in seconds.
*/
@Min(0)
private final int tgtTimeout;
/**
* ST cache entry timeout in seconds.
*/
@Min(0)
private final int stTimeout;
public RedisTicketRegistry(RedisTemplate<String,Object> reidsTemplate,int tgtTimeout,int stTimeout){
this.reidsTemplate=reidsTemplate;
this.tgtTimeout=tgtTimeout;
this.stTimeout=stTimeout;
}
@Override
public void addTicket(Ticket ticket) {
logger.debug("Adding ticket {}", ticket);
try {
reidsTemplate.opsForValue().set(ticket.getId(),ticket, getTimeout(ticket), TimeUnit.SECONDS);
} catch (final Exception e) {
logger.error("Failed adding {}", ticket, e);
}
}
@Override
public Ticket getTicket(String ticketId) {
try {
final Ticket t = (Ticket) this.reidsTemplate.opsForValue().get(ticketId);
if (t != null) {
return getProxiedTicketInstance(t);
}
} catch (final Exception e) {
logger.error("Failed fetching {} ", ticketId, e);
}
return null;
}
@Override
public boolean deleteTicket(String ticketId) {
logger.debug("Deleting ticket {}", ticketId);
try {
this.reidsTemplate.delete(ticketId);
return true;
} catch (final Exception e) {
logger.error("Failed deleting {}", ticketId, e);
}
return false;
}
@Override
public Collection<Ticket> getTickets() {
throw new UnsupportedOperationException("GetTickets not supported.");
}
@Override
protected void updateTicket(Ticket ticket) {
logger.debug("Updating ticket {}", ticket);
try {
this.reidsTemplate.delete(ticket.getId());
reidsTemplate.opsForValue().set(ticket.getId(),ticket, getTimeout(ticket), TimeUnit.SECONDS);
} catch (final Exception e) {
logger.error("Failed updating {}", ticket, e);
}
}
@Override
protected boolean needsCallback() {
// TODO Auto-generated method stub
return true;
}
private int getTimeout(final Ticket t) {
if (t instanceof TicketGrantingTicket) {
return this.tgtTimeout;
} else if (t instanceof ServiceTicket) {
return this.stTimeout;
}
throw new IllegalArgumentException("Invalid ticket type");
}
}2、整合cas-server-webapp工程
修改cas-server-webapp工程中ticketRegistry.xml文件，替换掉DefaultTicketRegistry，同时注释掉ticketRegistryCleaner相关所有定义，具体如下：
<bean id="ticketRegistry" class="com.test.cas.ticket.registry.RedisTicketRegistry"> <constructor-arg index="0" ref="redisTemplate" /> <constructor-arg index="1" value="1800" /> <constructor-arg index="2" value="10" /> </bean> <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig"> <property name="maxIdle" value="200" /> <property name="testOnBorrow" value="true" /> </bean> <bean id="connectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory" p:host-name="127.0.0.1" p:port="6379" p:pool-config-ref="poolConfig"/> <!—host-name 服务端IP--> <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate" p:connection-factory-ref="connectionFactory"> </bean>
使用Redis作为ticket票据的存储，需要将原来的配置给注释掉否则启动时报错，具体如下：
<!-- <bean id="ticketRegistry" class="org.jasig.cas.ticket.registry.DefaultTicketRegistry" /> --> <!--Quartz --> <!-- TICKET REGISTRY CLEANER --> <!-- <bean id="ticketRegistryCleaner" class="org.jasig.cas.ticket.registry.support.DefaultTicketRegistryCleaner" --> <!-- p:ticketRegistry-ref="ticketRegistry" /> --> <!-- <bean id="jobDetailTicketRegistryCleaner" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean" --> <!-- p:targetObject-ref="ticketRegistryCleaner" --> <!-- p:targetMethod="clean" /> --> <!-- <bean id="triggerJobDetailTicketRegistryCleaner" class="org.springframework.scheduling.quartz.SimpleTriggerBean" --> <!-- p:jobDetail-ref="jobDetailTicketRegistryCleaner" --> <!-- p:startDelay="20000" --> <!-- p:repeatInterval="5000000" /> -->
在POM.xml中添加cas-server-integration-redis模块：
<dependency>
<groupId>org.jasig.cas</groupId>
<artifactId>cas-server-integration-redis</artifactId>
<version>${project.version}</version>
<scope>compile</scope>
</dependency>此时CAS配置完毕，启动所有相关服务器即可使用，下面说说tomcat session集群同步的问题
3、tomcat session集群同步
保证多个实例下，session中的状态以及票据存储状态，是一致的，通过网络上查找资料，实现tomcat session集群同步可以采用开源的tomcat-redis-session-manager，git hub地址为：https://github.com/jcoleman/tomcat-redis-session-manager，注意使用的JDK是JDK1.7，服务器使用的是tomcat7
1）拷贝编译打包之后的tomcat-redis-session-manager-VERSION.jar，jedis-2.7.2.jar，commons-pool2-2.2.jar到tomcat/lib目录下
2）修改Tomcat context.xml (or the context block of the server.xml if applicable.)
<Valve className="com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve"/> <Manager className="com.orangefunction.tomcat.redissessions.RedisSessionManager" host="127.0.0.1" port="6379" database="0" maxInactiveInterval="1800"/>
到此为止，CAS集群部署工作完毕，欢迎大家收藏本站，有什么疑难问题，尽可留言。
