SSO单点登录是用户通过统一的认证后，访问其他应用不需要再次登录认证。
JA-SIG(CAS)
CAS(Central Authentication Service 中心认证服务)是使分布的各个异构系统的认证功能集中在一起，通过公共的认证系统统一管理和验证用户的身份，在CAS系统认证后的用户获得一个凭证，使用此凭证可以访问与CAS集成的其他所有系统。
CAS认证流程
CAS协议提供的接口，CAS-Server提供三个验证服务接口
一、用户登录URL，形如：https://sso.server.com/cas/servlet/login
用户登录时的页面
二、用户凭证校验URL，形如：http://sso.server.com/cas/servlet/validate
验证凭证token的链接
三、用户登出URL，形如：https://sso.server.com/cas/servlet/logout
用户退出时的链接
CAS集成步骤：
资源下载：https://pan.baidu.com/s/18WY3_mZXCE23DkNpn38HqQ
一、配置Window域名解析
编辑hosts文件，添加
127.0.0.1 sso.server.com
127.0.0.1 sso.client1.com
127.0.0.1 sso.client2.com
一、配置安全证书
用JDK自带的keytool工具生成证书
以管理员身份开启CMD窗口
keytool -genkey -alias ssodemo -keyalg RSA -keysize 1024 -keypass 123456 -validity 365 -keystore d:\test\ssokey -storepass 123456
使用Keytool导出证书文件
keytool -export -alias ssodemo -keystore d:\test\ssokey -file d:\test\ssokey.crt -storepass 123456
导入证书d:/test/ssokey.crt到JDK的受信任证书库中
keytool -import -keystore “%JAVA_HOME%”\jre\lib\security\cacerts -file d:\test\ssokey.crt -alias sso
JDK的证书库密码是changeit
二、配置Tomcat支持HTTPS协议
修改%TOMCAT_HOME%/conf/server.xml
<Connector port="8443" protocol="org.apache.coyote.http11.Http11Protocol"
maxThreads="150" SSLEnabled="true" scheme="https" secure="true"
keystoreFile="D:/test/ssokey" keystorePass="123456"
clientAuth="false" sslProtocol="TLS"/>
三、部署CAS认证服务器
解压下载的软件，存在一个cas.war文件,将其复制到webapps目录下。启动Tomcat访问https://sso.server.com:8443/cas
服务器端系统部署完成，缺少对数据库用户认证的支持，后面补充如何配置数据库用户认证。
四、配置客户端
另行解压一个Tomcat，修改其端口为18080，18009，18005。
<?xml version='1.0' encoding='utf-8'?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!-- Note: A "Server" is not itself a "Container", so you may not
define subcomponents such as "Valves" at this level.
Documentation at /docs/config/server.html
-->
<Server port="18005" shutdown="SHUTDOWN">
<Listener className="org.apache.catalina.startup.VersionLoggerListener" />
<!-- Security listener. Documentation at /docs/config/listeners.html
<Listener className="org.apache.catalina.security.SecurityListener" />
-->
<!--APR library loader. Documentation at /docs/apr.html -->
<Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />
<!-- Prevent memory leaks due to use of particular java/javax APIs-->
<Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
<Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />
<!-- Global JNDI resources
Documentation at /docs/jndi-resources-howto.html
-->
<GlobalNamingResources>
<!-- Editable user database that can also be used by
UserDatabaseRealm to authenticate users
-->
<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
pathname="conf/tomcat-users.xml" />
</GlobalNamingResources>
<!-- A "Service" is a collection of one or more "Connectors" that share
a single "Container" Note: A "Service" is not itself a "Container",
so you may not define subcomponents such as "Valves" at this level.
Documentation at /docs/config/service.html
-->
<Service name="Catalina">
<!--The connectors can use a shared executor, you can define one or more named thread pools-->
<!--
<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
maxThreads="150" minSpareThreads="4"/>
-->
<!-- A "Connector" represents an endpoint by which requests are received
and responses are returned. Documentation at :
Java HTTP Connector: /docs/config/http.html (blocking & non-blocking)
Java AJP Connector: /docs/config/ajp.html
APR (HTTP/AJP) Connector: /docs/apr.html
Define a non-SSL/TLS HTTP/1.1 Connector on port 8080
-->
<Connector port="18080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="18443" />
<!-- A "Connector" using the shared thread pool-->
<!--
<Connector executor="tomcatThreadPool"
port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
-->
<!-- Define a SSL/TLS HTTP/1.1 Connector on port 8443
This connector uses the NIO implementation that requires the JSSE
style configuration. When using the APR/native implementation, the
OpenSSL style configuration is required as described in the APR/native
documentation -->
<!--
<Connector port="8443" protocol="org.apache.coyote.http11.Http11NioProtocol"
maxThreads="150" SSLEnabled="true" scheme="https" secure="true"
clientAuth="false" sslProtocol="TLS" />
-->
<!-- Define an AJP 1.3 Connector on port 8009 -->
<Connector port="18009" protocol="AJP/1.3" redirectPort="18443" />
<!-- An Engine represents the entry point (within Catalina) that processes
every request. The Engine implementation for Tomcat stand alone
analyzes the HTTP headers included with the request, and passes them
on to the appropriate Host (virtual host).
Documentation at /docs/config/engine.html -->
<!-- You should set jvmRoute to support load-balancing via AJP ie :
<Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1">
-->
<Engine name="Catalina" defaultHost="localhost">
<!--For clustering, please take a look at documentation at:
/docs/cluster-howto.html (simple how to)
/docs/config/cluster.html (reference documentation) -->
<!--
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
-->
<!-- Use the LockOutRealm to prevent attempts to guess user passwords
via a brute-force attack -->
<Realm className="org.apache.catalina.realm.LockOutRealm">
<!-- This Realm uses the UserDatabase configured in the global JNDI
resources under the key "UserDatabase". Any edits
that are performed against this UserDatabase are immediately
available for use by the Realm. -->
<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
resourceName="UserDatabase"/>
</Realm>
<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true">
<!-- SingleSignOn valve, share authentication between web applications
Documentation at: /docs/config/valve.html -->
<!--
<Valve className="org.apache.catalina.authenticator.SingleSignOn" />
-->
<!-- Access log processes all example.
Documentation at: /docs/config/valve.html
Note: The pattern used is equivalent to using pattern="common" -->
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
prefix="localhost_access_log" suffix=".txt"
pattern="%h %l %u %t "%r" %s %b" />
</Host>
</Engine>
</Service>
</Server>
五、配置CAS认证集成
将解压的二个Jar包，复制到Web应用的WEB-INF/lib目录下
修改Web.xml,添加CAS过滤器
<listener>
<listener-class>org.jasig.cas.client.session.SingleSignOutHttpSessionListener</listener-class>
</listener>
<filter>
<filter-name>CAS Single Sign Out Filter</filter-name>
<filter-class>org.jasig.cas.client.session.SingleSignOutFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CAS Single Sign Out Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>CAS Filter</filter-name>
<filter-class>org.jasig.cas.client.authentication.AuthenticationFilter</filter-class>
<init-param>
<param-name>casServerLoginUrl</param-name>
<param-value>https://sso.server.com:8443/cas/login</param-value>
</init-param>
<init-param>
<param-name>serverName</param-name>
<param-value>http://sso.client1.com:18080</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CAS Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>CAS Validation Filter</filter-name>
<filter-class>org.jasig.cas.client.validation.Cas10TicketValidationFilter</filter-class>
<init-param>
<param-name>casServerUrlPrefix</param-name>
<param-value>https://sso.server.com:8443/cas</param-value>
</init-param>
<init-param>
<param-name>serverName</param-name>
<param-value>http://sso.client1.com:18080</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CAS Validation Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>CAS HttpServletRequest Wrapper Filter</filter-name>
<filter-class>org.jasig.cas.client.util.HttpServletRequestWrapperFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CAS HttpServletRequest Wrapper Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>CAS Assertion Thread Local Filter</filter-name>
<filter-class>org.jasig.cas.client.util.AssertionThreadLocalFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CAS Assertion Thread Local Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
启动Tomcat，测试单点登录
当访问 http://sso.client1.com:18080时自动跳转到CAS认证服务
输入用户名／密码 casuser/Mellon后自动跳转到http://sso.client1.com:18080
六、集成数据库用户认证
复制下载的三个Jar包到cas.war部署后的WEB-INF/lib目录下
修改WEB-INF/deployerConfigContext.xml
修改：
<?xml version="1.0" encoding="UTF-8"?>
<!--
Licensed to Jasig under one or more contributor license
agreements. See the NOTICE file distributed with this work
for additional information regarding copyright ownership.
Jasig licenses this file to you under the Apache License,
Version 2.0 (the "License"); you may not use this file
except in compliance with the License. You may obtain a
copy of the License at the following location:
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
-->
<!--
| deployerConfigContext.xml centralizes into one file some of the declarative configuration that
| all CAS deployers will need to modify.
|
| This file declares some of the Spring-managed JavaBeans that make up a CAS deployment.
| The beans declared in this file are instantiated at context initialization time by the Spring
| ContextLoaderListener declared in web.xml. It finds this file because this
| file is among those declared in the context parameter "contextConfigLocation".
|
| By far the most common change you will need to make in this file is to change the last bean
| declaration to replace the default authentication handler with
| one implementing your approach for authenticating usernames and passwords.
+-->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:c="http://www.springframework.org/schema/c"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:sec="http://www.springframework.org/schema/security"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.2.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">
<!--
| The authentication manager defines security policy for authentication by specifying at a minimum
| the authentication handlers that will be used to authenticate credential. While the AuthenticationManager
| interface supports plugging in another implementation, the default PolicyBasedAuthenticationManager should
| be sufficient in most cases.
+-->
<bean id="authenticationManager" class="org.jasig.cas.authentication.PolicyBasedAuthenticationManager">
<constructor-arg>
<map>
<!--
| IMPORTANT
| Every handler requires a unique name.
| If more than one instance of the same handler class is configured, you must explicitly
| set its name to something other than its default name (typically the simple class name).
-->
<entry key-ref="proxyAuthenticationHandler" value-ref="proxyPrincipalResolver" />
<!--
<entry key-ref="primaryAuthenticationHandler" value-ref="primaryPrincipalResolver" />
-->
<!-- key-ref指定自己的本地数据库访问 -->
<entry key-ref="dbAuthHandler" value-ref="primaryPrincipalResolver"/>
</map>
</constructor-arg>
<!-- Uncomment the metadata populator to allow clearpass to capture and cache the password
This switch effectively will turn on clearpass.
<property name="authenticationMetaDataPopulators">
<util:list>
<bean class="org.jasig.cas.extension.clearpass.CacheCredentialsMetaDataPopulator"
c:credentialCache-ref="encryptedMap" />
</util:list>
</property>
-->
<!--
| Defines the security policy around authentication. Some alternative policies that ship with CAS:
|
| * NotPreventedAuthenticationPolicy - all credential must either pass or fail authentication
| * AllAuthenticationPolicy - all presented credential must be authenticated successfully
| * RequiredHandlerAuthenticationPolicy - specifies a handler that must authenticate its credential to pass
-->
<property name="authenticationPolicy">
<bean class="org.jasig.cas.authentication.AnyAuthenticationPolicy" />
</property>
</bean>
<!-- Required for proxy ticket mechanism. -->
<bean id="proxyAuthenticationHandler"
class="org.jasig.cas.authentication.handler.support.HttpBasedServiceCredentialsAuthenticationHandler"
p:httpClient-ref="httpClient" />
<!--
| TODO: Replace this component with one suitable for your enviroment.
|
| This component provides authentication for the kind of credential used in your environment. In most cases
| credential is a username/password pair that lives in a system of record like an LDAP directory.
| The most common authentication handler beans:
|
| * org.jasig.cas.authentication.LdapAuthenticationHandler
| * org.jasig.cas.adaptors.jdbc.QueryDatabaseAuthenticationHandler
| * org.jasig.cas.adaptors.x509.authentication.handler.support.X509CredentialsAuthenticationHandler
| * org.jasig.cas.support.spnego.authentication.handler.support.JCIFSSpnegoAuthenticationHandler
-->
<bean id="primaryAuthenticationHandler"
class="org.jasig.cas.authentication.AcceptUsersAuthenticationHandler">
<property name="users">
<map>
<entry key="casuser" value="Mellon"/>
</map>
</property>
</bean>
<!-- Required for proxy ticket mechanism -->
<bean id="proxyPrincipalResolver"
class="org.jasig.cas.authentication.principal.BasicPrincipalResolver" />
<!--
| Resolves a principal from a credential using an attribute repository that is configured to resolve
| against a deployer-specific store (e.g. LDAP).
-->
<bean id="primaryPrincipalResolver"
class="org.jasig.cas.authentication.principal.PersonDirectoryPrincipalResolver" >
<property name="attributeRepository" ref="attributeRepository" />
</bean>
<!--
Bean that defines the attributes that a service may return. This example uses the Stub/Mock version. A real implementation
may go against a database or LDAP server. The id should remain "attributeRepository" though.
+-->
<bean id="attributeRepository" class="org.jasig.services.persondir.support.StubPersonAttributeDao"
p:backingMap-ref="attrRepoBackingMap" />
<util:map id="attrRepoBackingMap">
<entry key="uid" value="uid" />
<entry key="eduPersonAffiliation" value="eduPersonAffiliation" />
<entry key="groupMembership" value="groupMembership" />
</util:map>
<!--
Sample, in-memory data store for the ServiceRegistry. A real implementation
would probably want to replace this with the JPA-backed ServiceRegistry DAO
The name of this bean should remain "serviceRegistryDao".
+-->
<bean id="serviceRegistryDao" class="org.jasig.cas.services.InMemoryServiceRegistryDaoImpl"
p:registeredServices-ref="registeredServicesList" />
<util:list id="registeredServicesList">
<bean class="org.jasig.cas.services.RegexRegisteredService"
p:id="0" p:name="HTTP and IMAP" p:description="Allows HTTP(S) and IMAP(S) protocols"
p:serviceId="^(https?|imaps?)://.*" p:evaluationOrder="10000001" />
<!--
Use the following definition instead of the above to further restrict access
to services within your domain (including sub domains).
Note that example.com must be replaced with the domain you wish to permit.
This example also demonstrates the configuration of an attribute filter
that only allows for attributes whose length is 3.
-->
<!--
<bean class="org.jasig.cas.services.RegexRegisteredService">
<property name="id" value="1" />
<property name="name" value="HTTP and IMAP on example.com" />
<property name="description" value="Allows HTTP(S) and IMAP(S) protocols on example.com" />
<property name="serviceId" value="^(https?|imaps?)://([A-Za-z0-9_-]+\.)*example\.com/.*" />
<property name="evaluationOrder" value="0" />
<property name="attributeFilter">
<bean class="org.jasig.cas.services.support.RegisteredServiceRegexAttributeFilter" c:regex="^\w{3}$" />
</property>
</bean>
-->
</util:list>
<bean id="auditTrailManager" class="com.github.inspektr.audit.support.Slf4jLoggingAuditTrailManager" />
<bean id="healthCheckMonitor" class="org.jasig.cas.monitor.HealthCheckMonitor" p:monitors-ref="monitorsList" />
<util:list id="monitorsList">
<bean class="org.jasig.cas.monitor.MemoryMonitor" p:freeMemoryWarnThreshold="10" />
<!--
NOTE
The following ticket registries support SessionMonitor:
* DefaultTicketRegistry
* JpaTicketRegistry
Remove this monitor if you use an unsupported registry.
-->
<bean class="org.jasig.cas.monitor.SessionMonitor"
p:ticketRegistry-ref="ticketRegistry"
p:serviceTicketCountWarnThreshold="5000"
p:sessionCountWarnThreshold="100000" />
</util:list>
<!-- 指定数据源 -->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/cas"/>
<property name="username" value="root" />
<property name="password" value="root" />
</bean>
<!-- 访问本地数据库 -->
<bean id="dbAuthHandler"
class="org.jasig.cas.adaptors.jdbc.QueryDatabaseAuthenticationHandler"
p:dataSource-ref="dataSource"
p:sql="select password from t_user where loginid=?"/>
</beans>