CAS介紹
CAS是一個單點登入架構，由耶魯大學的一個組織開發。CAS是一個開源項目，代碼目前是在github上管理。單點登入：Single Sign On,簡稱SSO，SSO使得在多個應用系統中，使用者隻需要登入一次就可以通路所有互相信任的應用系統。通俗了解為一個應用登入了，其他被授權的應用不用再登入。之前也寫過一篇sso單點登入,用redis實作的,有興趣可以翻翻
cas下載下傳位址:https://github.com/apereo/cas/releases
cas服務搭建
我們案例下載下傳使用的是CAS4.2,采用HTTPS協定處理使用者請求。搭建HTTPS需要咱們生成對應的證書資訊。當然也可以通過配置使其支援http協定,但畢竟http協定不安全,是以我們還是學一下如何搭建本地HTTPS服務.
1.生成秘鑰庫
keytool -genkey -alias shemuel -keyalg RSA -keystore E:/javaee/cas/keystory/shemeul
其中-alias後面的是密鑰庫别名,最後的shemeul是要生成的密鑰庫檔案.
指令運作後密鑰庫就生成了,接着就是導出這個密鑰的證書,運作如下指令:
keytool -export -trustcacerts -alias shemuel -file E:/javaee/cas/keystory/shemuel.cer -keystore E:/javaee/cas/keystory/shemuel
前面的路徑是要導出證書的位置,後面的路徑是之前密鑰庫的路徑
将證書導入到JDK證書庫
剛才的操作會根據我們的秘鑰庫生成一個證書，緊接着我們需要将該證書導入到JDK的證書庫裡才能使用。
keytool -import -trustcacerts -alias shemuel -file E:/javaee/cas/keystory/shemuel.cer -keystore "F:/Java/jdk1.8.0_131/jre/lib/security/cacerts"
要求輸入密鑰庫密碼:注意這個密鑰庫是jdk的密鑰庫,密碼密碼為:changeit
2.tomcat釋出cas服務端項目
在githib上下載下傳cas服務端項目 https://github.com/apereo/cas/releases
- 解壓一個tomcat，放到D:\workspace\cas\目錄下，把剛才我們下載下傳的cas解壓打開target目錄下有個cas.war 拷貝到tomcat的webapps目錄并解壓，删除war包。
- 下載下傳的cas解壓目錄下還有一個檔案target\war\work\org.jasig.cas\cas-server-webapp\WEB-INF\cas.properties，把他拷貝到webapps\cas\WEB-INF目錄下。
- 修改spring-configuration\propertyFileConfigurer.xml，把location="file:/etc/cas/cas.properties"換成剛才cas.properties的絕對路徑。
<util:properties id="casProperties" location="file:D:/workspace/cas/apache-tomcat-8.5.16/webapps/cas/WEB-INF/cas.properties" />
修改tomcat的conf/server.xml，加入如下代碼
<Connector port="443" protocol="org.apache.coyote.http11.Http11NioProtocol"
maxThreads="150" SSLEnabled="true" scheme="https" secure="true"
clientAuth="false" sslProtocol="TLS"
keystoreFile="E:\javaee\cas\keystory\shemuel"
keystorePass="123456" />
啟動tomcat, bin目錄下的 startup.bat
通路 https://shemuel:8443/cas/login
我這裡的本地hosts配置了 127.0.0.1 對應 shemuel了,有興趣也可以配置一下.
通路後可能出現浏覽器安全提示,因為我們的證書是本地的,沒交錢是以會出現警告,添加個例外繼續通路,看到如下界面就說明成功了
登入名:casuser 密碼:Mellon
這是cas自帶的一個登入使用者,我們可以配置資料庫資訊,使用我們自己的資料庫表使用者登入
3.配置cas資料庫連接配接池
- 打開webapps\cas\WEB-INF\deployerConfigContext.xml
- 把32行的
<alias name="acceptUsersAuthenticationHandler" alias="primaryAuthenticationHandler" />
- 将如下代碼拷貝到deployerConfigContext.xml中
<!--配置加密算法-->
<bean id="MD5PasswordEncoder" class="org.jasig.cas.authentication.handler.DefaultPasswordEncoder" autowire="byName">
<constructor-arg value="MD5"/>
</bean>
<!--查詢資料所采用什麼加密方式-->
<bean id="queryDatabaseAuthenticationHandler" name="primaryAuthenticationHandler" class="org.jasig.cas.adaptors.jdbc.QueryDatabaseAuthenticationHandler">
<property name="passwordEncoder" ref="MD5PasswordEncoder"/>
</bean>
<!--名字叫dataSource的Bean取别名叫queryDatabaseDataSource-->
<alias name="dataSource" alias="queryDatabaseDataSource"/>
<!--配置資料源-->
<bean id="dataSource"
class="com.mchange.v2.c3p0.ComboPooledDataSource"
p:driverClass="com.mysql.jdbc.Driver"
p:jdbcUrl="jdbc:mysql://127.0.0.1:3306/springsecurity?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull"
p:user="root"
p:password="123456"
p:initialPoolSize="6"
p:minPoolSize="6"
p:maxPoolSize="18"
p:maxIdleTimeExcessConnections="120"
p:checkoutTimeout="10000"
p:acquireIncrement="6"
p:acquireRetryAttempts="5"
p:acquireRetryDelay="2000"
p:idleConnectionTestPeriod="30"
p:preferredTestQuery="select 1"/>
<!--end 從資料庫中的使用者表中讀取 -->
- 把如下jar包拷貝到lib下
CAS實作SSO單點登入案例(整合SpringSecurity) - 配置查詢語句
修改cas.properties 220行，去掉注釋，修改如下：
cas.jdbc.authn.query.sql=select password from users where username=?
由于此時我們指定的加密算法為md5了，是以我們需要重新增加一條md5加密的資料到資料庫去。
INSERT INTO users(username,password,enabled)VALUES('itheima',(SELECT MD5('123456')),'true');
重新開機tomcat，用itheima登入成功。
CSA實作單點登入功能
建立一個maven工程，配置一下CAS相關過濾器，然後通路首頁。
pom依賴
<dependency>
<groupId>org.jasig.cas.client</groupId>
<artifactId>cas-client-core</artifactId>
<version>3.3.3</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<build>
<plugins>
<!-- 配置Tomcat插件 -->
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<configuration>
<port>70</port>
<!-- http://127.0.0.1:{port}/{path} -->
<path>/</path>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
web.xml
<!-- 用于單點退出，該過濾器用于實作單點登出功能，可選配置 -->
<listener>
<listener-class>org.jasig.cas.client.session.SingleSignOutHttpSessionListener</listener-class>
</listener>
<!-- 該過濾器用于實作單點登出功能，可選配置。 -->
<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>
<!-- 該過濾器負責使用者的認證工作，必須啟用它 -->
<filter>
<filter-name>CASFilter</filter-name>
<filter-class>org.jasig.cas.client.authentication.AuthenticationFilter</filter-class>
<init-param>
<param-name>casServerLoginUrl</param-name>
<!--這是cas 服務端登陸認證位址 -->
<param-value>https://shemuel:8443/cas/login</param-value>
</init-param>
<init-param>
<param-name>serverName</param-name>
<param-value>http://shemuel:70</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CASFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--登陸成功後cas server會重定向到之前要訪問的頁面並攜帶一個ticket,該ticket需要重新進行校驗認證。 以下過濾器負責對Ticket的校驗工作，必須啟用它 -->
<filter>
<filter-name>CAS Validation Filter</filter-name>
<filter-class>org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter</filter-class>
<init-param>
<param-name>casServerUrlPrefix</param-name>
<param-value>https://shemuel:8443/cas</param-value>
</init-param>
<init-param>
<param-name>serverName</param-name>
<param-value>http://shemuel:70</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CAS Validation Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 該過濾器負責實作HttpServletRequest請求的包裹， 比如允許開發者通過HttpServletRequest的getRemoteUser()方法獲得SSO登入使用者的登入名，可選配置。 -->
<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>
<!-- 該過濾器使得開發者可以通過org.jasig.cas.client.util.AssertionHolder來擷取使用者的登入名。 比如AssertionHolder.getAssertion().getPrincipal().getName()。 -->
<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>
tomcat運作，端口70,出現如下報錯
上面錯誤的原因是因為CAS預設值接受HTTPS有IMAPS協定請求的認證，我們需要把HTTP也給加上去。
打開下載下傳的cas項目: cas\WEB-INF\classes\services\HTTPSandIMAPS-10000001.json，修改第3行
"serviceId" : "^(https|imaps)://.*",
改成
"serviceId" : "^(https|imaps|http)://.*",
儲存，并重新啟動即可。
拷貝casclient-demo1 模拟兩個用戶端
拷貝casclien-demo1 改名casclient-demo2 部署，tomcat端口18083，進行單點測試。一個站點登入後另外一個站點就不需要登入了。
如果營運一旦出現如下錯誤，請調整tomcat的JDK，和生成秘鑰的JDK保持一緻，不要用SDK即可。
java.lang.RuntimeException: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
org.jasig.cas.client.util.CommonUtils.getResponseFromServer(CommonUtils.java:407)
org.jasig.cas.client.validation.AbstractCasProtocolUrlBasedTicketValidator.retrieveResponseFromServer(AbstractCasProtocolUrlBasedTicketValidator.java:45)
org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:200)
org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:206)
org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:161)
org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:100)
Root Cause
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1949)
sun.security.ssl.Handshaker.fatalSE(Handshaker.java:302)
sun.security.ssl.Handshaker.fatalSE(Handshaker.java:296)
sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1509)
sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:216)
sun.security.ssl.Handshaker.processLoop(Handshaker.java:979)
sun.security.ssl.Handshaker.process_record(Handshaker.java:914)
sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1062)
sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)
sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)
sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)
sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559)
sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)
sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1513)
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)
sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
org.jasig.cas.client.util.CommonUtils.getResponseFromServer(CommonUtils.java:393)
org.jasig.cas.client.validation.AbstractCasProtocolUrlBasedTicketValidator.retrieveResponseFromServer(AbstractCasProtocolUrlBasedTicketValidator.java:45)
org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:200)
org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:206)
org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:161)
org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:100)
Root Cause
sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:387)
sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:292)
sun.security.validator.Validator.validate(Validator.java:260)
sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:324)
sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:229)
sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:124)
sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1491)
sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:216)
sun.security.ssl.Handshaker.processLoop(Handshaker.java:979)
sun.security.ssl.Handshaker.process_record(Handshaker.java:914)
sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1062)
sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)
sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)
sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)
sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559)
sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)
sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1513)
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)
sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
org.jasig.cas.client.util.CommonUtils.getResponseFromServer(CommonUtils.java:393)
org.jasig.cas.client.validation.AbstractCasProtocolUrlBasedTicketValidator.retrieveResponseFromServer(AbstractCasProtocolUrlBasedTicketValidator.java:45)
org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:200)
org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:206)
org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:161)
org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:100)
cas服務端和兩個用戶端都啟動後,我們通路其中一個用戶端登入後,另一個用戶端就不需要登入了說明成功!
至此簡易的單點登入系統就完成了,後面會介紹springsecurity 如何整合cas
參考:傳智播客教學視訊
傳智播客官網: http://itcast.cn