springboot之cas客户端

  一、CAS Client 与受保护的客户端应用部署在一起,以 Filter 方式保护受保护的资源。对于访问受保护资源的每个 Web 请求,CAS Client 会分析该请求的 Http 请求中是否包含 Service Ticket,如果没有,则说明当前用户尚未登录,于是将请求重定向到指定好的 CAS Server 登录地址,并传递 Service (也就是要访问的目的资源地址),以便登录成功过后转回该地址。用户在第 3 步中输入认证信息,如果登录成功,CAS Server 随机产生一个相当长度、唯一、不可伪造的 Service Ticket,并缓存以待将来验证,之后系统自动重定向到 Service 所在地址,并为客户端浏览器设置一个 Ticket Granted Cookie(TGC),CAS Client 在拿到 Service 和新产生的 Ticket 过后,在第 5,6 步中与 CAS Server 进行身份核实,以确保 Service Ticket 的合法性。

  二、在该协议中,所有与 CAS 的交互均采用 SSL 协议,确保,ST 和 TGC 的安全性。协议工作过程中会有 2 次重定向的过程,但是 CAS Client 与 CAS Server 之间进行 Ticket 验证的过程对于用户是透明的。

  三、cas客户端主要提供的是业务支持,我们在使用的时候更多是通过cas服务端来做认证支持。这里主要讲的是如何搭建cas客户端,配置的东西其实是通过spring的security来进行过滤。然后达到登录的目的,认证中主要是通过Ticket的票据进行认证的,当用户登录成功。会获取到登录的username,然后做进一步处理。

  四、服务端的部署参考:https://www.cnblogs.com/ll409546297/p/10410972.html

  五、客户端的搭建(这里服务端采用的https的方式)

  1)需要的依赖包

  <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-cas</artifactId>
        </dependency>
    </dependencies>
  <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>

  说明:下面这个依赖包主要是用于配置

  2)目录结构

  

  3)cas的参数配置(cas.properties、CasProperties)

cas.clientUrl=http://localhost:${server.port}
cas.clientLogin=/login
cas.clientLogout=/logout
cas.serverUrl=https://www.casserver.com:8443/cas
cas.serverLogin=/login
cas.serverLogout=/logout
cas.trustStorePath=cas/cas.keystore
cas.trustStorePassword=changeit
@PropertySource(value = "classpath:config/cas.properties")
@ConfigurationProperties(prefix = "cas")
public class CasProperties {

    //客户端url(本机)
    private String clientUrl;
    //登录接口
    private String clientLogin;
    //登出接口
    private String clientLogout;
    //服务端url
    private String serverUrl;
    //登录接口
    private String serverLogin;
    //登出接口
    private String serverLogout;
    //证书密匙路径
    private String trustStorePath;
    //密码
    private String trustStorePassword;

    public String getClientUrl() {
        return clientUrl;
    }

    public void setClientUrl(String clientUrl) {
        this.clientUrl = clientUrl;
    }

    public String getClientLogin() {
        return clientLogin;
    }

    public void setClientLogin(String clientLogin) {
        this.clientLogin = clientLogin;
    }

    public String getClientLogout() {
        return clientLogout;
    }

    public void setClientLogout(String clientLogout) {
        this.clientLogout = clientLogout;
    }

    public String getServerUrl() {
        return serverUrl;
    }

    public void setServerUrl(String serverUrl) {
        this.serverUrl = serverUrl;
    }

    public String getServerLogin() {
        return serverLogin;
    }

    public void setServerLogin(String serverLogin) {
        this.serverLogin = serverLogin;
    }

    public String getServerLogout() {
        return serverLogout;
    }

    public void setServerLogout(String serverLogout) {
        this.serverLogout = serverLogout;
    }

    public String getTrustStorePath() {
        return trustStorePath;
    }

    public void setTrustStorePath(String trustStorePath) {
        this.trustStorePath = trustStorePath;
    }

    public String getTrustStorePassword() {
        return trustStorePassword;
    }

    public void setTrustStorePassword(String trustStorePassword) {
        this.trustStorePassword = trustStorePassword;
    }
}

  说明:1、trustStorePath:这个主要使用的服务器上面生成的cas.keystore密钥、在服务器搭建中我们生成了cas.keystore、域名改成www.casserver.com。目的不支持直接使用IP。

     本地修改hosts:C:\Windows\System32\drivers\etc\hosts

       

     

    2、cas.keystore:服务器生成密钥,tomcat进行部署,https访问时需要的私密密钥

    3、当然可以不使用cas.keystore,通过服务器上面生成的cas.crt证书然后客户端的jdk也是可以验证通过的。

keytool -import -keystore "E:\Java\jdk1.8.0_192\jre\lib\security\cacerts" -file cas.crt -alias cas -storepass changeit

  4)cas相关配置(CasConfiguration、SecurityConfiguration)

@Configuration
@Import(CasProperties.class)
public class CasConfiguration {

    //cas相关参数
    @Autowired
    private CasProperties casProperties;

    //客户端的服务配置,主要用于跳转
    @Bean
    public ServiceProperties serviceProperties() {
        ServiceProperties serviceProperties = new ServiceProperties();
        //该项目的登录地址
        serviceProperties.setService(casProperties.getClientUrl() + casProperties.getClientLogin());
        serviceProperties.setAuthenticateAllArtifacts(true);
        return serviceProperties;
    }

    //cas认证点
    @Bean
    public CasAuthenticationEntryPoint casAuthenticationEntryPoint() {
        CasAuthenticationEntryPoint casAuthenticationEntryPoint = new CasAuthenticationEntryPoint();
        //cas的登录地址
        casAuthenticationEntryPoint.setLoginUrl(casProperties.getServerUrl() + casProperties.getServerLogin());
        //入口
        casAuthenticationEntryPoint.setServiceProperties(serviceProperties());
        return casAuthenticationEntryPoint;
    }

    //票据
    @Bean
    public Cas30ServiceTicketValidator cas30ServiceTicketValidator() {
        return new Cas30ServiceTicketValidator(casProperties.getServerUrl());
    }

    //认证支持
    @Bean
    public CasAuthenticationProvider casAuthenticationProvider(AuthDetailsService authDetailsService) {
        CasAuthenticationProvider casAuthenticationProvider = new CasAuthenticationProvider();
        casAuthenticationProvider.setKey("client1");
        casAuthenticationProvider.setServiceProperties(serviceProperties());
        casAuthenticationProvider.setTicketValidator(cas30ServiceTicketValidator());
        //本地登录后的操作,走security体系
        casAuthenticationProvider.setUserDetailsService(authDetailsService);
        //这里也可以使用setAuthenticationUserDetailsService管理
        //casAuthenticationProvider.setAuthenticationUserDetailsService();
        return casAuthenticationProvider;
    }

    //单点登录过滤
    @Bean
    public SingleSignOutFilter singleSignOutFilter() {
        SingleSignOutFilter singleSignOutFilter = new SingleSignOutFilter();
        singleSignOutFilter.setCasServerUrlPrefix(casProperties.getServerUrl());
        singleSignOutFilter.setIgnoreInitConfiguration(true);
        return singleSignOutFilter;
    }

    //登出过滤
    @Bean
    public LogoutFilter logoutFilter() {
        //重定向地址
        String logoutRedirectPath = casProperties.getServerUrl() + casProperties.getServerLogout() + "?service=" + casProperties.getClientUrl();
        LogoutFilter logoutFilter = new LogoutFilter(logoutRedirectPath, new SecurityContextLogoutHandler());
        //登出接口
        logoutFilter.setFilterProcessesUrl(casProperties.getServerLogout());
        return logoutFilter;
    }

}
@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true, jsr250Enabled = true)
@Import(CasProperties.class)
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {

    //认证
    @Autowired
    private CasAuthenticationProvider authenticationProvider;

    //认证点
    @Autowired
    private CasAuthenticationEntryPoint authenticationEntryPoint;

    //登出过滤
    @Autowired
    private LogoutFilter logoutFilter;

    //单点登出
    @Autowired
    private SingleSignOutFilter singleSignOutFilter;

    //cas配置
    @Autowired
    private CasProperties casProperties;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            .csrf().disable()
            .exceptionHandling()
            .authenticationEntryPoint(authenticationEntryPoint)
        .and()
            .authorizeRequests()
            .anyRequest().authenticated()
        .and()
            //添加认证过滤(这里我遇到一个坑,如果通过注入方式加入,会出现循环依赖问题)
            .addFilter(casAuthenticationFilter())
            //登出过滤
            .addFilterBefore(logoutFilter, LogoutFilter.class)
            //单点登出过滤
            .addFilterBefore(singleSignOutFilter, CasAuthenticationFilter.class);
    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        //认证方式
        auth.authenticationProvider(authenticationProvider);
    }

    @Bean
    public CasAuthenticationFilter casAuthenticationFilter() throws Exception {
        //过滤器配置
        CasAuthenticationFilter casAuthenticationFilter = new CasAuthenticationFilter();
        //使用security的认证管理
        casAuthenticationFilter.setAuthenticationManager(authenticationManager());
        //拦截登录接口
        casAuthenticationFilter.setFilterProcessesUrl(casProperties.getClientLogin());
        return casAuthenticationFilter;
    }
}

  5)登录后的username处理(AuthDetailsService)

@Service
public class AuthDetailsService implements UserDetailsService {

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        if (username == null){
            throw new UsernameNotFoundException("用户不存在!");
        }
        List<SimpleGrantedAuthority> simpleGrantedAuthorities = new ArrayList<>();
        simpleGrantedAuthorities.add(new SimpleGrantedAuthority("ADMIN"));
        return new org.springframework.security.core.userdetails.User(username, username, simpleGrantedAuthorities);
    }
}

  说明:这里只是简单处理,实际可以自己绑定用户处理

  6)https处理(CasIinitTask)

@Component
@Import(CasProperties.class)
public class CasIinitTask {

    @Autowired
    private CasProperties casProperties;

    @PostConstruct
    public void loadKeystore() throws IOException {
        //如果使用https,则必须加入密钥
        Assert.isTrue(!(casProperties.getServerUrl().startsWith("https") && casProperties.getTrustStorePath() == null),
                "trustStorePath must not null to configuration https");
        //密钥
        if (!StringUtils.isEmpty(casProperties.getTrustStorePath())) {
            Resource resource = new ClassPathResource(casProperties.getTrustStorePath());
            System.setProperty("javax.net.ssl.trustStore", resource.getFile().getAbsolutePath());
        }
        //有可能密码的情况
        if (StringUtils.isEmpty(casProperties.getTrustStorePassword())) {
            System.setProperty("javax.net.ssl.trustStorePassword", casProperties.getTrustStorePassword());
        }
    }
}

  7)启动项目测试:

  六、源码:https://github.com/lilin409546297/springboot-cas

  七、这里只是简单的搭建过程,实际cas还需要做二次开发。相比于cas和oauth2我个人更加喜欢oauth2,个人看法。

 

posted @ 2019-02-26 10:49  小不点丶  阅读(2601)  评论(0编辑  收藏  举报