使用SpringBoot集成CAS、应用场景和示例代码

news2024/9/9 5:25:49

Spring Boot与CAS集成可以为应用程序提供单点登录（SSO）功能，CAS（Central Authentication Service）是一种单点登录协议，用于通过一个中央认证服务器来进行认证，从而使用户可以通过一次登录访问多个应用程序。

概述

集成CAS到Spring Boot应用程序中，通常需要以下步骤：

配置CAS客户端，使其能够与CAS服务器进行通信。
配置Spring Security，以便应用程序能够使用CAS进行身份验证。
编写必要的配置和代码，确保CAS和Spring Security协同工作。

应用场景

企业内部系统：统一企业内部系统的登录认证，用户只需登录一次即可访问多个应用。
教育机构：学生和教职工可以通过CAS进行统一登录，方便访问多个教育相关的应用。
各种Web应用：任何需要单点登录的Web应用场景，CAS都可以作为解决方案。

示例代码

以下是一个简单的Spring Boot应用程序，集成CAS进行单点登录。

依赖配置

确保在pom.xml中添加必要的依赖项：

<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>

<dependency>
    <groupId>org.jasig.cas.client</groupId>
    <artifactId>cas-client-core</artifactId>
    <version>3.6.0</version>
</dependency>

CAS客户端配置

在application.properties（或application.yml）中配置CAS服务器和客户端信息：

# CAS Server URL
cas.server.url.prefix=https://your-cas-server.com/cas
cas.server.login.url=${cas.server.url.prefix}/login
cas.server.logout.url=${cas.server.url.prefix}/logout

# CAS Client
cas.client.host-url=http://localhost:8080
cas.client.login-url=${cas.server.login.url}?service=${cas.client.host-url}/login/cas
cas.client.logout-url=${cas.server.logout.url}?service=${cas.client.host-url}/logout

# Application properties
server.port=8080

Spring Security配置

创建一个配置类来配置Spring Security与CAS集成：

import org.springframework.context.annotation.Configuration;
import org.springframework.security.cas.ServiceProperties;
import org.springframework.security.cas.authentication.CasAssertionAuthenticationToken;
import org.springframework.security.cas.authentication.CasAuthenticationProvider;
import org.springframework.security.cas.web.CasAuthenticationEntryPoint;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.authority.AuthorityUtils;
import org.springframework.security.core.userdetails.AuthenticationUserDetailsService;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.security.web.authentication.logout.LogoutFilter;
import org.springframework.security.web.authentication.logout.SecurityContextLogoutHandler;

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            .authorizeRequests()
                .antMatchers("/").permitAll()
                .anyRequest().authenticated()
                .and()
            .logout()
                .logoutSuccessUrl("/")
                .invalidateHttpSession(true)
                .deleteCookies("JSESSIONID")
                .and()
            .addFilterBefore(casLogoutFilter(), LogoutFilter.class)
            .exceptionHandling()
                .authenticationEntryPoint(casAuthenticationEntryPoint());
    }

    private CasAuthenticationEntryPoint casAuthenticationEntryPoint() {
        CasAuthenticationEntryPoint entryPoint = new CasAuthenticationEntryPoint();
        entryPoint.setLoginUrl("https://your-cas-server.com/cas/login");
        entryPoint.setServiceProperties(serviceProperties());
        return entryPoint;
    }

    private ServiceProperties serviceProperties() {
        ServiceProperties serviceProperties = new ServiceProperties();
        serviceProperties.setService("http://localhost:8080/login/cas");
        serviceProperties.setSendRenew(false);
        return serviceProperties;
    }

    private LogoutFilter casLogoutFilter() {
        String logoutUrl = "https://your-cas-server.com/cas/logout";
        CasLogoutFilter filter = new CasLogoutFilter(logoutUrl, new SecurityContextLogoutHandler());
        filter.setFilterProcessesUrl("/logout");
        return filter;
    }

    // CAS Authentication Provider
    @Bean
    public CasAuthenticationProvider casAuthenticationProvider() {
        CasAuthenticationProvider provider = new CasAuthenticationProvider();
        provider.setAuthenticationUserDetailsService(casUserDetailsService());
        provider.setServiceProperties(serviceProperties());
        provider.setTicketValidator(new Cas30ServiceTicketValidator("https://your-cas-server.com/cas"));
        provider.setKey("CAS_PROVIDER_LOCALHOST_8080");
        return provider;
    }

    // User Details Service for CAS Authentication
    @Bean
    public AuthenticationUserDetailsService<CasAssertionAuthenticationToken> casUserDetailsService() {
        return token -> {
            String username = token.getName();
            // Dummy implementation to load user details, replace with your actual logic
            UserDetails userDetails = loadUserByUsername(username);
            return userDetails;
        };
    }

    // Dummy UserDetailsService (replace with your actual implementation)
    private UserDetails loadUserByUsername(String username) {
        if ("user".equals(username)) {
            return new org.springframework.security.core.userdetails.User(username, "password", 
                true, true, true, true,
                AuthorityUtils.createAuthorityList("ROLE_USER"));
        } else {
            throw new UsernameNotFoundException("User not found.");
        }
    }
}

在上面的代码中：