Spring boot security权限管理集成cas单点登录功能的实现

目录

• 1.Springboot集成Springsecurity
• 2.部署CASserver
• 3.配置CASclient

挣扎了两周，Spring security的cas终于搞出来了，废话不多说，开篇！

1.Spring boot集成Spring security

本篇是使用spring security集成cas，因此，先得集成spring security
新建一个Spring boot项目，加入maven依赖，我这里是用的架构是Spring boot2.0.4+Spring mvc+Spring data jpa+Spring security5
pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.cas.client1</groupId>
    <artifactId>cas-client1</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>cas-client1</name>
    <description>Demo project for Spring Boot</description>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
            <artifactId>spring-boot-starter-test</artifactId>
            <artifactId>spring-boot-starter-security</artifactId>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
        <!-- security taglibs -->
            <artifactId>spring-security-taglibs</artifactId>
            <groupId>org.springframework.security.oauth</groupId>
            <artifactId>spring-security-oauth2</artifactId>
            <version>RELEASE</version>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        <!-- https://mvnrepository.com/artifact/com.alibaba/druid-spring-boot-starter -->
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
            <artifactId>spring-boot</artifactId>
            <version>2.0.2.RELEASE</version>
            <scope>compile</scope>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

application.properties：

server.port=8083
#静态文件访问存放地址
spring.resources.static-locations=classpath:/html/
# thymeleaf 模板存放地址
spring.thymeleaf.prefix=classpath:/html/
spring.thymeleaf.suffix=.html
spring.thymeleaf.mode=LEGACYHTML5
spring.thymeleaf.encoding=UTF-8

# JDBC 配置(驱动类自动从url的mysql识别,数据源类型自动识别)
# 或spring.datasource.url=
spring.datasource.druid.url=jdbc:mysql://localhost:3306/vhr?useUnicode=true&characterEncoding=UTF8
# 或spring.datasource.username=
spring.datasource.druid.username=root
# 或spring.datasource.password=
spring.datasource.druid.password=1234
#或 spring.datasource.driver-class-name=
#spring.datasource.druid.driver-class-name=com.mysql.jdbc.Driver
#连接池配置(通常来说，只需要修改initialSize、minIdle、maxActive
# 如果用Oracle，则把poolPreparedStatements配置为true，mysql可以配置为false。分库分表较多的数据库，建议配置为false。removeabandoned不建议在生产环境中打开如果用SQL Server，建议追加配置)
spring.datasource.druid.initial-size=1
spring.datasource.druid.max-active=20
spring.datasource.druid.min-idle=1
# 配置获取连接等待超时的时间
spring.datasource.druid.max-wait=60000
#打开PSCache，并且指定每个连接上PSCache的大小
spring.datasource.druid.pool-prepared-statements=true
spring.datasource.druid.max-pool-prepared-statement-per-connection-size=20
#spring.datasource.druid.max-open-prepared-statements=和上面的等价
spring.datasource.druid.validation-query=SELECT 'x'
#spring.datasource.druid.validation-query-timeout=
spring.datasource.druid.test-on-borrow=false
spring.datasource.druid.test-on-return=false
spring.datasource.druid.test-while-idle=true
#配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
spring.datasource.druid.time-between-eviction-runs-millis=60000
#配置一个连接在池中最小生存的时间，单位是毫秒
spring.datasource.druid.min-evictable-idle-time-millis=300000
#spring.datasource.druid.max-evictable-idle-time-millis=
#配置多个英文逗号分隔
#spring.datasource.druid.filters= stat
# WebStatFilter配置，说明请参考Druid Wiki，配置_配置WebStatFilter
#是否启用StatFilter默认值true
spring.datasource.druid.web-stat-filter.enabled=true
spring.datasource.druid.web-stat-filter.url-pattern=/*
spring.datasource.druid.web-stat-filter.exclusions=*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*
spring.datasource.druid.web-stat-filter.session-stat-enable=false
spring.datasource.druid.web-stat-filter.session-stat-max-count=1000
spring.datasource.druid.web-stat-filter.principal-session-name=admin
spring.datasource.druid.web-stat-filter.principal-cookie-name=admin
spring.datasource.druid.web-stat-filter.profile-enable=true
# StatViewServlet配置
#展示Druid的统计信息,StatViewServlet的用途包括：1.提供监控信息展示的html页面2.提供监控信息的JSON API
#是否启用StatViewServlet默认值true
spring.datasource.druid.stat-view-servlet.enabled=true
spring.datasource.druid.stat-view-servlet.url-pattern=/druid/*
# JPA config
spring.jpa.database=mysql
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
spring.jpa.generate-ddl=true
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
spring.jpa.open-in-view=true
# 解决jpa no session的问题
spring.jpa.properties.hibernate.enable_lazy_load_no_trans=true

这里使用数据库存储角色权限信息，分三种实体：用户；角色；资源；用户对角色多对多；角色对资源多对多
创建几个实体类：
用户：这里直接使用用户持久化对象实现Spring security要求的UserDetails接口，并实现对应方法

package com.cas.client1.entity;

import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.util.CollectionUtils;
import javax.persistence.*;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
@Entity
@Table(name = "s_user")
public class User implements UserDetails {
    @Id
    private String id;
    @Column(name = "username")
    private String username;
    @Column(name = "password")
    private String password;
    @ManyToMany(fetch = FetchType.LAZY)
    @JoinTable(
            name = "s_user_role",
            joinColumns = @JoinColumn(name = "user_id"),
            inverseJoinColumns = @JoinColumn(name = "role_id")
    )
    private List<Role> roles;
    public User() {
    }
    public User(String id, String username, String password) {
        this.id = id;
        this.username = username;
        this.password = password;
    public String getId() {
        return id;
    public void setId(String id) {
    public List<Role> getRoles() {
        return roles;
    public void setRoles(List<Role> roles) {
        this.roles = roles;
    @Override
    public String getUsername() {
        return username;
    public boolean isAccountNonExpired() {
        return true;
    public boolean isAccountNonLocked() {
    public boolean isCredentialsNonExpired() {
    public boolean isEnabled() {
    public void setUsername(String username) {
    @Transient
    List<GrantedAuthority> grantedAuthorities=new ArrayList<>();
    public Collection<? extends GrantedAuthority> getAuthorities() {
        if (grantedAuthorities.size()==0){
            if (!CollectionUtils.isEmpty(roles)){
                for (Role role:roles){
                    List<Resource> resources = role.getResources();
                    if (!CollectionUtils.isEmpty(resources)){
                        for (Resource resource:resources){
                            grantedAuthorities.add(new SimpleGrantedAuthority(resource.getResCode()));
                        }
                    }
                }
            }
            grantedAuthorities.add(new SimpleGrantedAuthority("AUTH_0"));
        }
        return grantedAuthorities;
    public String getPassword() {
        return password;
    public void setPassword(String password) {
}

注意看这里：

我给每一位登录的用户都授予了AUTH_0的权限，AUTH_0在下面的SecurityMetaDataSource里被关联的url为：/**,也就是说除开那些机密程度更高的，这个登录用户能访问所有资源

角色：

package com.cas.client1.entity;

import javax.persistence.*;
import java.util.List;
/**
 * @author Administrator
 */
@Entity
@Table(name = "s_role")
public class Role {
    @Id
    @Column(name = "id")
    private String id;
    @Column(name = "role_name")
    private String roleName;
    @ManyToMany(fetch = FetchType.LAZY)
    @JoinTable(
            name = "s_role_res",
            joinColumns = @JoinColumn(name = "role_id"),
            inverseJoinColumns = @JoinColumn(name = "res_id")
    )
    private List<Resource> resources;
            name = "s_user_role",
            inverseJoinColumns = @JoinColumn(name = "user_id")
    private List<User> users;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    public String getRoleName() {
        return roleName;
    public void setRoleName(String roleName) {
        this.roleName = roleName;
    public List<Resource> getResources() {
        return resources;
    public void setResources(List<Resource> resources) {
        this.resources = resources;
    public List<User> getUsers() {
        return users;
    public void setUsers(List<User> users) {
        this.users = users;
}

权限：

package com.cas.client1.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "s_resource")
public class Resource {
    @Id
    @Column(name = "id")
    private String id;
    @Column(name = "res_name")
    private String resName;
    @Column(name = "res_code")
    private String resCode;
    @Column(name = "url")
    private String url;
    @Column(name = "priority")
    private String priority;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    public String getResName() {
        return resName;
    public void setResName(String resName) {
        this.resName = resName;
    public String getResCode() {
        return resCode;
    public void setResCode(String resCode) {
        this.resCode = resCode;
    public String getUrl() {
        return url;
    public void setUrl(String url) {
        this.url = url;
    public String getPriority() {
        return priority;
    public void setPriority(String priority) {
        this.priority = priority;
}

建立几个DAO
UserDao：

package com.cas.client1.dao;

import com.cas.client1.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface UserDao extends JpaRepository<User,String> {
    @Override
    List<User> findAll();
    List<User> findByUsername(String username);
    /**
     * 根据用户名like查询
     * @param username
     * @return
     */
    List<User> getUserByUsernameContains(String username);
    @Query("from User where id=:id")
    User getUserById(@Param("id") String id);
}

ResourceDao：

package com.cas.client1.dao;

import com.cas.client1.entity.Resource;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.stereotype.Repository;
import java.util.List;
/**
 * @author Administrator
 */
@Repository
public interface ResourceDao extends JpaRepository<Resource,String> {
    @Query("from Resource order by priority")
    List<Resource> getAllResource();
}

Service
UserService：

package com.cas.client1.service;

import com.cas.client1.dao.UserDao;
import com.cas.client1.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserService {
    @Autowired
    private UserDao userDao;
    public User findByUsername(String username){
        List<User> list = userDao.findByUsername(username);
        return list!=null&&list.size()>0?list.get(0):null;
    }
}

ResourceService：

package com.cas.client1.service;

import com.cas.client1.dao.ResourceDao;
import com.cas.client1.entity.Resource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class ResourceService {
    @Autowired
    private ResourceDao resourceDao;
    public List<Resource> getAll(){
        return resourceDao.getAllResource();
    }
}

创建UserDetailsServiceImpl，实现UserDetailsService接口，这个类是用以提供给Spring security从数据库加载用户信息的

package com.cas.client1.security;

import com.cas.client1.entity.User;
import com.cas.client1.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.cas.authentication.CasAssertionAuthenticationToken;
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.stereotype.Component;

/**
 * @author Administrator
 */
@SuppressWarnings("ALL")
@Component
public class UserDetailsServiceImpl implements UserDetailsService{
    @Autowired
    private UserService userService;
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User user = userService.findByUsername(username);
        return user;
    }

}

记得加@Component注解，以把实例交由Spring管理，或@Service，你们喜欢就好

创建SecurityMetaDataSource类
该类实现Spring security的FilterInvocationSecurityMetadataSource接口，作用是提供权限的元数据定义，并根据请求url匹配该url所需要的权限，获取权限后交由AccessDecisionManager的实现者裁定能否访问这个url，不能则会返回403的http错误码
SecurityMetaDataSource：

package com.cas.client1.security;

import com.cas.client1.entity.Resource;
import com.cas.client1.service.ResourceService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.access.SecurityConfig;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;
import org.springframework.security.web.util.matcher.AndRequestMatcher;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;
import org.springframework.security.web.util.matcher.RequestMatcher;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import java.util.*;

@Component
public class SecurityMetaDataSource implements FilterInvocationSecurityMetadataSource {

    @Autowired
    private ResourceService resourceService;

    private LinkedHashMap<String,Collection<ConfigAttribute>> metaData;
    @PostConstruct
    private void loadSecurityMetaData(){
        List<Resource> list = resourceService.getAll();
        metaData=new LinkedHashMap<>();
        for (Resource resource:list){
            List<ConfigAttribute> attributes=new ArrayList<>();
            attributes.add(new SecurityConfig(resource.getResCode()));
            metaData.put(resource.getUrl(),attributes);
        }
        List<ConfigAttribute> base=new ArrayList<>();
        base.add(new SecurityConfig("AUTH_0"));
        metaData.put("/**",base);
    }

    @Override
    public Collection<ConfigAttribute> getAttributes(Object object) throws IllegalArgumentException {
        FilterInvocation invocation= (FilterInvocation) object;
        if (metaData==null){
            return new ArrayList<>(0);
        }
        String requestUrl = invocation.getRequestUrl();
        System.out.println("请求Url："+requestUrl);
        Iterator<Map.Entry<String, Collection<ConfigAttribute>>> iterator = metaData.entrySet().iterator();
        Collection<ConfigAttribute> rs=new ArrayList<>();
        while (iterator.hasNext()){
            Map.Entry<String, Collection<ConfigAttribute>> next = iterator.next();
            String url = next.getKey();
            Collection<ConfigAttribute> value = next.getValue();
            RequestMatcher requestMatcher=new AntPathRequestMatcher(url);
            if (requestMatcher.matches(invocation.getRequest())){
                rs = value;
                break;
            }
        }
        System.out.println("拦截认证权限为："+rs);
        return rs;
    }

    @Override
    public Collection<ConfigAttribute> getAllConfigAttributes() {
        System.out.println("invoke getAllConfigAttributes ");
        //loadSecurityMetaData();
        //System.out.println("初始化元数据");
        Collection<Collection<ConfigAttribute>> values = metaData.values();
        Collection<ConfigAttribute> all=new ArrayList<>();
        for (Collection<ConfigAttribute> each:values){
            each.forEach(configAttribute -> {
                all.add(configAttribute);
            });
        }
        return all;
    }

    @Override
    public boolean supports(Class<?> clazz) {
        return true;
    }
}

同理：记得加上@Component注解

重头戏来了！Spring security的配置
创建SpringSecurityConfig类
该类继承于WebSecurityConfigurerAdapter，核心的配置类，在这里定义Spring security的使用方式

SpringSecurityConfig

package com.cas.client1.security;

import com.cas.client1.config.CasProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDecisionVoter;
import org.springframework.security.access.vote.AffirmativeBased;
import org.springframework.security.access.vote.RoleVoter;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.builders.WebSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.web.access.intercept.FilterSecurityInterceptor;

import java.util.ArrayList;
import java.util.List;

/**
 * Spring security配置
 * @author youyp
 * @date 2018-8-10
 */
@SuppressWarnings("ALL")
@Configuration
@EnableWebSecurity
public class SpringSecurityConfig extends WebSecurityConfigurerAdapter {
    @Autowired
    private UserDetailsServiceImpl userDetailsService;

    @Autowired
    private SecurityMetaDataSource securityMetaDataSource;

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        super.configure(auth);
    }

    @Override
    public void configure(WebSecurity web) throws Exception {
        web.ignoring().antMatchers("/js/**","/css/**","/img/**","/*.ico","/login.html",
                "/error","/login.do");
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        System.out.println("配置Spring security");
        http.formLogin()
                //指定登录页是”/login”
                .loginPage("/login.html").permitAll()
                .loginProcessingUrl("/login.do").permitAll()
                .defaultSuccessUrl("/home",true)
                .permitAll()
                //登录成功后可使用loginSuccessHandler()存储用户信息，可选。
                //.successHandler(loginSuccessHandler()).permitAll()
                .and()
                .logout().permitAll()
                .invalidateHttpSession(true)
                .and()
                //登录后记住用户，下次自动登录,数据库中必须存在名为persistent_logins的表
                .rememberMe()
                .tokenValiditySeconds(1209600)
                .and()
                .csrf().disable()
                //其他所有资源都需要认证，登陆后访问
                .authorizeRequests().anyRequest().fullyAuthenticated();

        http.addFilterBefore(filterSecurityInterceptor(),FilterSecurityInterceptor.class);
    }

    /**
     * 注意：这里不能加@Bean注解
     * @return
     * @throws Exception
     */
    //@Bean
    public FilterSecurityInterceptor filterSecurityInterceptor() throws Exception {
        FilterSecurityInterceptor filterSecurityInterceptor=new FilterSecurityInterceptor();
        filterSecurityInterceptor.setSecurityMetadataSource(securityMetaDataSource);
        filterSecurityInterceptor.setAuthenticationManager(authenticationManager());
        filterSecurityInterceptor.setAccessDecisionManager(affirmativeBased());
        return filterSecurityInterceptor;
    }

    /**
     * 重写AuthenticationManager获取的方法并且定义为Bean
     * @return
     * @throws Exception
     */
    @Override
    @Bean
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }

    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        //指定密码加密所使用的加密器为passwordEncoder()
        //需要将密码加密后写入数据库
        auth.userDetailsService(userDetailsService).passwordEncoder(passwordEncoder());
        auth.eraseCredentials(false);
    }

    @Bean
    public BCryptPasswordEncoder passwordEncoder() {

        return new BCryptPasswordEncoder(4);
    }

    /**
     * 定义决策管理器，这里可直接使用内置的AffirmativeBased选举器，
     * 如果需要，可自定义，继承AbstractAccessDecisionManager，实现decide方法即可
     * @return
     */
    @Bean
    public AccessDecisionManager affirmativeBased(){
        List<AccessDecisionVoter<? extends Object>> voters=new ArrayList<>();
        voters.add(roleVoter());
        System.out.println("正在创建决策管理器");
        return new AffirmativeBased(voters);
    }

    /**
     * 定义选举器
     * @return
     */
    @Bean
    public RoleVoter roleVoter(){
        //这里使用角色选举器
        RoleVoter voter=new RoleVoter();
        System.out.println("正在创建选举器");
        voter.setRolePrefix("AUTH_");
        System.out.println("已将角色选举器的前缀修改为AUTH_");
        return voter;
    }

}

说一个注意点：

FilterSecurityInterceptor这个过滤器最为重要，它负责数据库权限信息加载，权限鉴定等关键动作，这个过滤器位于SpringSecurityFilterChain，即Spring security的过滤器链中，如果将这个类在配置类中加了@Bean注解，那么它将直接加入web容器的过滤器链中，这个链是首层过滤器链，
进入这个过滤器链之后才会进入SpringSecurityFilterChain这个负责安全的链条，如果这个跑到外层去了，就会导致这个独有的过滤器一直在生效，请求无限被拦截重定向，因为这个过滤器前面没有别的过滤器阻止它生效，如果它位于SpringSecurityFilterChain中，在进入FilterSecurityInterceptor这个
过滤器之前会有很多的Spring security过滤器在生效，如果不满足前面的过滤器的条件，不会进入到这个过滤器。也就是说，要进入到这个过滤器，必须要从SpringSecurityFilterChain进入，从其他地方进入都会导致请求被无限重定向

另外
FilterSecurityInterceptor这个类继承于AbstractSecurityInterceptor并实现Filter接口，由此我们可以重写该类，自定义我们的特殊业务，但是，个人觉得FilterSecurityInterceptor这个实现类已经很完整地实现了这个过滤器应做的工作，没有必要重写
类似的，还有AccessDecisionManager这个“决策者”，Spring security为这个功能提供了几个默认的实现者，如AffirmativeBased这个类，是一个基于投票的决策器，投票器（Voter）要求实现AccessDecisionVoter接口，Spring security已为我们提供了几个很有用的投票器如RoleVoter，WebExpressionVoter
这些我们都没有必要去自定义，而且自定义出来的也没有默认实现拓展性和稳定性更好

再定义一个登陆的Controller
LoginController

package com.cas.client2.casclient2.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.cas.authentication.CasAuthenticationToken;
import org.springframework.security.cas.web.CasAuthenticationFilter;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpSession;

@SuppressWarnings("ALL")
@Controller
public class LoginController {
    @Autowired
    private AuthenticationManager authenticationManager;

    /**
     * 自定义登录地址
     * @param username
     * @param password
     * @param session
     * @return
     */
    @RequestMapping("login.do")
    public String login(String username,String passwod, HttpSession session){
        try {
            System.out.println("进入登录请求..........");
            UsernamePasswordAuthenticationToken token=new UsernamePasswordAuthenticationToken(username,passwod);

            Authentication authentication=authenticationManager.authenticate(token);
            SecurityContextHolder.getContext().setAuthentication(authentication);
            session.setAttribute("SPRING_SECURITY_CONTEXT", SecurityContextHolder.getContext());
            System.out.println("登录成功");
            return "redirect:home.html";
        }catch (Exception e){
            e.printStackTrace();
            return "login.html";
        }

    }
}

创建几个页面：在resources下创建文件夹html，用于存放html静态文件，
home.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>HOME</title>
</head>
<body>
<h1>welcome to Home</h1>
<button onclick="javascript:location.href='/logout'">退出</button>
</body>
</html>

login.html

<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
<head>
    <meta charset="UTF-8">
    <title>登录</title>
</head>

<body>
<span style="color: red" id="msg"></span>
<form action="/login.do" method="post">
    <div><label> User Name : <input type="text" name="username"/> </label></div>
    <div><label> Password: <input type="password" name="password"/> </label></div>
    <div><input type="submit" value="Sign In"/></div>
    <input type="checkbox" name="remember-me" value="true" th:checked="checked"/><p>Remember me</p>
</form>

</body>
<script type="text/javascript">
    var url=location.href
    var param=url.split("?")[1];
    console.log(param);
    if (param){
        var p=param.split("&");
        var msg=p[0].split("=")[1];
        document.getElementById("msg").innerHTML=msg;
    }
</script>
</html>

admin.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>admin</title>
</head>
<body>
你好，欢迎登陆,这是管理员界面，拥有/admin.html的访问权限才能访问
</body>
</html>

再定义几个错误页面
在html文件夹下创建一个error文件夹，在error文件夹中创建403.html，404.html,500.html；在程序遇到这些错误码时，会自动跳转到对应的页面

先启动一下项目，让spring-data-jpa反向生成一下表结构
再往数据库插入几条数据：
用户表的密码需要放密文，我们把我们的明文密码使用我们的密码encoder转一下：BCryptPasswordEncoder.encode("123");得到密文后存到数据库的password字段中
用户表：

资源表：即权限信息表

角色表：

角色权限中间表：

我们先不给用户配置角色，现在是空角色

启动Spring boot启动类，访问localhost:8083,检测到没登录会自动跳到登录页面，登录后自动跳转到home.html

访问admin.html，返回403页面，当前用户无权限访问

再将刚刚的角色分配给用户，再次访问

此时便可访问，大功告成！

2.部署CAS server

cas全称Central Authentication Service，翻译为：中央认证服务；从名字我们便可得知，这是一个独立的服务，主要负责用户登录凭证的验证；事实也是如此，cas有认证中心和client端，认证中心就是我们的cas server，负责用户凭证的验证，需要独立部署，cas client就是我们的各个相互信任的应用
我们从cas官网下载源码，从moudle中找到一个.war后缀的文件，将这个文件拷出来，
改一下文件名为：cas，放到一个Tomcat中，启动tomcat，（端口先改一下，如8081），在浏览器中访问localhost:8081/cas即可看到cas的登录界面

报了个警告，说我们没有配置ssl，也就是需要配置https，不过可以不用配置，
我们可以配置使用http：

设置cas server使用http非安全协议

主要有以下步骤：

1.WEB-INF/deployerConfigContext.xml中在<beanclass="org.jasig.cas.authentication.handler.support.HttpBasedServiceCredentialsAuthenticationHandler"p:httpClient-ref="httpClient"/>增加参数p:requireSecure="false"，是否需要安全验证，即HTTPS，false为不采用如下：<beanclass="org.jasig.cas.authentication.handler.support.HttpBasedServiceCredentialsAuthenticationHandler"p:httpClient-ref="httpClient"p:requireSecure="false"/>

1. WEB-INF/spring-configuration/ticketGrantingTicketCookieGenerator.xml中将p:cookieSecure="true"修改为 p:cookieSecure="false"

2. WEB-INF/spring-configuration/warnCookieGenerator.xml中将p:cookieSecure="true"改为p:cookieSecure="false"

3. 在tomcat的server.xml中关闭8443端口，如下图

3.配置CAS client

在之前Spring security的基础上，我们加入cas认证
在pom.xml中加入依赖包：

 <!-- security 对CAS支持 -->
         <dependency>
             <groupId>org.springframework.security</groupId>
             <artifactId>spring-security-cas</artifactId>
        </dependency>

修改一下我们的UserDetailsServiceImpl类，让它实现AuthenticationUserDetailsService<CasAssertionAuthenticationToken>接口
UserDetailsServiceImpl：

package com.cas.client1.security;

import com.cas.client1.entity.User;
import com.cas.client1.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.cas.authentication.CasAssertionAuthenticationToken;
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.stereotype.Component;
/**
 * @author Administrator
 */
@SuppressWarnings("ALL")
@Component
public class UserDetailsServiceImpl implements UserDetailsService,
        AuthenticationUserDetailsService<CasAssertionAuthenticationToken> {
    @Autowired
    private UserService userService;
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User user = userService.findByUsername(username);
        return user;
    }
    /**
     * 实现AuthenticationUserDetailsService的方法，
     * 用于获取cas server返回的用户信息，再根据用户关键信息加载出用户在当前系统的权限
     * @param token
     * @return
     * @throws UsernameNotFoundException
     */
    public UserDetails loadUserDetails(CasAssertionAuthenticationToken token) throws UsernameNotFoundException {
        String name = token.getName();
        System.out.println("获得的用户名："+name);
        User user = userService.findByUsername(name);
        if (user==null){
            throw new UsernameNotFoundException(name+"不存在");
        }
}

在application.properties文件中加上以下内容：

# cas服务器地址
cas.server.host.url=http://localhost:8081/cas
# cas服务器登录地址
cas.server.host.login_url=${cas.server.host.url}/login
# cas服务器登出地址
cas.server.host.logout_url=${cas.server.host.url}/logout?service=${app.server.host.url}
# 应用访问地址
app.server.host.url=http://localhost:8083
# 应用登录地址
app.login.url=/login.do
# 应用登出地址
app.logout.url=/logout

新增一个配置实体类

CasProperties

package com.cas.client1.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class CasProperties {
    @Value("${cas.server.host.url}")
    private String casServerUrl;
    @Value("${cas.server.host.login_url}")
    private String casServerLoginUrl;
    @Value("${cas.server.host.logout_url}")
    private String casServerLogoutUrl;
    @Value("${app.server.host.url}")
    private String appServerUrl;
    @Value("${app.login.url}")
    private String appLoginUrl;
    @Value("${app.logout.url}")
    private String appLogoutUrl;
   /**get set方法略
    */
}

再修改一下我们的Spring security配置类

package com.cas.client1.security;

import com.cas.client1.config.CasProperties;
import org.jasig.cas.client.session.SingleSignOutFilter;
import org.jasig.cas.client.validation.Cas20ServiceTicketValidator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpMethod;
import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDecisionVoter;
import org.springframework.security.access.vote.AffirmativeBased;
import org.springframework.security.access.vote.RoleVoter;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.cas.ServiceProperties;
import org.springframework.security.cas.authentication.CasAuthenticationProvider;
import org.springframework.security.cas.web.CasAuthenticationEntryPoint;
import org.springframework.security.cas.web.CasAuthenticationFilter;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.builders.WebSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.web.access.intercept.FilterSecurityInterceptor;
import org.springframework.security.web.authentication.logout.LogoutFilter;
import org.springframework.security.web.authentication.logout.SecurityContextLogoutHandler;

import java.util.ArrayList;
import java.util.List;

/**
 * Spring security配置
 * @author youyp
 * @date 2018-8-10
 */
@SuppressWarnings("ALL")
@Configuration
@EnableWebSecurity
public class SpringSecurityConfig extends WebSecurityConfigurerAdapter {
    @Autowired
    private CasProperties casProperties;

    @Autowired
    private UserDetailsServiceImpl userDetailsService;

    @Autowired
    private SecurityMetaDataSource securityMetaDataSource;

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        super.configure(auth);
        auth.authenticationProvider(casAuthenticationProvider());
    }

    @Override
    public void configure(WebSecurity web) throws Exception {
        web.ignoring().antMatchers("/js/**","/css/**","/img/**","/*.ico","/login.html",
                "/error","/login.do");
        //web.ignoring().antMatchers("/js/**","/css/**","/img/**","/*.ico",,"/home");
        //web.ignoring().antMatchers("/**");
//        super.configure(web);

    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        System.out.println("配置Spring security");
        http.formLogin()
                //指定登录页是”/login”
                //.loginPage("/login.html").permitAll()
                //.loginProcessingUrl("/login.do").permitAll()
                //.defaultSuccessUrl("/home",true)
                //.permitAll()
                //登录成功后可使用loginSuccessHandler()存储用户信息，可选。
                //.successHandler(loginSuccessHandler()).permitAll()
                .and()
                .logout().permitAll()
                //退出登录后的默认网址是”/home”
                //.logoutSuccessUrl("/home.html")
                //.permitAll()
                .invalidateHttpSession(true)
                .and()
                //登录后记住用户，下次自动登录,数据库中必须存在名为persistent_logins的表
                .rememberMe()
                .tokenValiditySeconds(1209600)
                .and()
                .csrf().disable()
                //其他所有资源都需要认证，登陆后访问
                .authorizeRequests().anyRequest().fullyAuthenticated();
        http.exceptionHandling().authenticationEntryPoint(casAuthenticationEntryPoint())
                .and()
                .addFilterAt(casAuthenticationFilter(),CasAuthenticationFilter.class)
                .addFilterBefore(casLogoutFilter(),LogoutFilter.class)
                .addFilterBefore(singleSignOutFilter(),CasAuthenticationFilter.class);
        /**
         *  FilterSecurityInterceptor本身属于过滤器，不能在外面定义为@Bean，
         *  如果定义在外面，则这个过滤器会被独立加载到webContext中，导致请求会一直被这个过滤器拦截
         *  加入到Springsecurity的过滤器链中，才会使它完整的生效
         */
        http.addFilterBefore(filterSecurityInterceptor(),FilterSecurityInterceptor.class);
    }

    /**
     * 注意：这里不能加@Bean注解
     * @return
     * @throws Exception
     */
//    @Bean
    public FilterSecurityInterceptor filterSecurityInterceptor() throws Exception {
        FilterSecurityInterceptor filterSecurityInterceptor=new FilterSecurityInterceptor();
        filterSecurityInterceptor.setSecurityMetadataSource(securityMetaDataSource);
        filterSecurityInterceptor.setAuthenticationManager(authenticationManager());
        filterSecurityInterceptor.setAccessDecisionManager(affirmativeBased());
        return filterSecurityInterceptor;
    }

    /**
     * 认证入口
     *  <p>
     *    <b>Note:</b>浏览器访问不可直接填客户端的login请求,若如此则会返回Error页面，无法被此入口拦截
     *  </p>
     * @return
     */
    @Bean
    public CasAuthenticationEntryPoint casAuthenticationEntryPoint(){
        CasAuthenticationEntryPoint casAuthenticationEntryPoint=new CasAuthenticationEntryPoint();
        casAuthenticationEntryPoint.setLoginUrl(casProperties.getCasServerLoginUrl());
        casAuthenticationEntryPoint.setServiceProperties(serviceProperties());
        return casAuthenticationEntryPoint;
    }

    @Bean
    public ServiceProperties serviceProperties() {
        ServiceProperties serviceProperties=new ServiceProperties();
        serviceProperties.setService(casProperties.getAppServerUrl()+casProperties.getAppLoginUrl());
        serviceProperties.setAuthenticateAllArtifacts(true);
        return serviceProperties;
    }

    //    @Bean
    public CasAuthenticationFilter casAuthenticationFilter() throws Exception {
        CasAuthenticationFilter casAuthenticationFilter=new CasAuthenticationFilter();
        casAuthenticationFilter.setAuthenticationManager(authenticationManager());
        casAuthenticationFilter.setFilterProcessesUrl(casProperties.getAppLoginUrl());
//        casAuthenticationFilter.setAuthenticationSuccessHandler(
//                new SimpleUrlAuthenticationSuccessHandler("/home.html"));
        return casAuthenticationFilter;
    }

    @Bean
    public CasAuthenticationProvider casAuthenticationProvider(){
        CasAuthenticationProvider casAuthenticationProvider=new CasAuthenticationProvider();
        casAuthenticationProvider.setAuthenticationUserDetailsService(userDetailsService);

        casAuthenticationProvider.setServiceProperties(serviceProperties());
        casAuthenticationProvider.setTicketValidator(cas20ServiceTicketValidator());
        casAuthenticationProvider.setKey("casAuthenticationProviderKey");
        return casAuthenticationProvider;
    }

    @Bean
    public Cas20ServiceTicketValidator cas20ServiceTicketValidator() {
        return new Cas20ServiceTicketValidator(casProperties.getCasServerUrl());
    }

    //    @Bean
    public SingleSignOutFilter singleSignOutFilter(){
        SingleSignOutFilter singleSignOutFilter=new SingleSignOutFilter();
        singleSignOutFilter.setCasServerUrlPrefix(casProperties.getCasServerUrl());
        singleSignOutFilter.setIgnoreInitConfiguration(true);
        return singleSignOutFilter;
    }

    //    @Bean
    public LogoutFilter casLogoutFilter(){
        LogoutFilter logoutFilter = new LogoutFilter(casProperties.getCasServerLogoutUrl(), new SecurityContextLogoutHandler());
        logoutFilter.setFilterProcessesUrl(casProperties.getAppLogoutUrl());
        return logoutFilter;
    }

    /**
     * 重写AuthenticationManager获取的方法并且定义为Bean
     * @return
     * @throws Exception
     */
    @Override
    @Bean
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }

    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        //指定密码加密所使用的加密器为passwordEncoder()
        //需要将密码加密后写入数据库
        //auth.userDetailsService(userDetailsService).passwordEncoder(passwordEncoder());
        //auth.eraseCredentials(false);
    }

    @Bean
    public BCryptPasswordEncoder passwordEncoder() {

        return new BCryptPasswordEncoder(4);
    }

    /**
     * 定义决策管理器，这里可直接使用内置的AffirmativeBased选举器，
     * 如果需要，可自定义，继承AbstractAccessDecisionManager，实现decide方法即可
     * @return
     */
    @Bean
    public AccessDecisionManager affirmativeBased(){
        List<AccessDecisionVoter<? extends Object>> voters=new ArrayList<>();
        voters.add(roleVoter());
        System.out.println("正在创建决策管理器");
        return new AffirmativeBased(voters);
    }

    /**
     * 定义选举器
     * @return
     */
    @Bean
    public RoleVoter roleVoter(){
        //这里使用角色选举器
        RoleVoter voter=new RoleVoter();
        System.out.println("正在创建选举器");
        voter.setRolePrefix("AUTH_");
        System.out.println("已将角色选举器的前缀修改为AUTH_");
        return voter;
    }

    @Bean
    public LoginSuccessHandler loginSuccessHandler() {
        return new LoginSuccessHandler();
    }

}

这里我们新增了几个filter，请注意，这几个filter定义时都不能配置@Bean注解，原因以上相同，这几个filter都要加入到springSecurity的FilterChain中，而不是直接加入到web容器的FilterChain中
再修改一下LoginController

package com.cas.client1.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.cas.web.CasAuthenticationFilter;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpSession;
@SuppressWarnings("Duplicates")
@Controller
public class LoginController {
    @Autowired
    private AuthenticationManager authenticationManager;
    /**
     * 自定义登录地址
     * @param username
     * @param password
     * @param session
     * @return
     */
    @RequestMapping("login.do")
    public String login(String ticket, HttpSession session){
        try {
            System.out.println("进入登录请求..........");
            //cas单点登录的用户名就是：_cas_stateful_ ，用户凭证是server传回来的ticket
            String username = CasAuthenticationFilter.CAS_STATEFUL_IDENTIFIER;
            UsernamePasswordAuthenticationToken token=new UsernamePasswordAuthenticationToken(username,ticket);
            Authentication authentication=authenticationManager.authenticate(token);
            SecurityContextHolder.getContext().setAuthentication(authentication);
            session.setAttribute("SPRING_SECURITY_CONTEXT", SecurityContextHolder.getContext());
            System.out.println("登录成功");
            return "redirect:home.html";
        }catch (Exception e){
            e.printStackTrace();
            return "login.html";
        }
    }
}

这时，之前负责登录的loginController不再是验证用户名和密码正不正确了，因为用户名密码的验证已经交给cas server了，LoginController的工作就是接收cas server重定向时传回来的ticket，验证ticket的有效性，如果没有异常，则会进入到UserDetailsServiceImpl中的loadUserDetails方法，并根据用户名加载用户权限等信息，然后我们再将用户信息存入Session，完成本地登录，本地登录之后，用户每次请求时，就不需要再次验证ticket了，而是验证Session

到这里，cas client已经配置完成，为了看清楚流程，我们以debug模式启动一下项目，在loginController的login方法开头打一个断点，打开浏览器调试模式（F12），切换到network看请求，在浏览器中输入：localhost:8083,浏览器会自动重定向到cas server 的登录页面，如下图：

我们输入一个数据库中有的用户名，再在密码栏中输入一次用户名，因为这里的cas server验证方式还没改，只要求用户名和密码相同就可通过验证，后面我会研究一下怎么修改cas server 的验证方式为数据库验证
如输入：用户名：user 密码：user
点击登录，验证成功后，我们看F12 network请求，发现浏览器发送了两个请求，一个是8081的，也就是cas server的，另外一个是8083的，也就是我们的client端的，如图：

另一个

因为我们在后台开了debug模式，打了断点，所以后面这个请求一直在pending状态，我们先看第一个请求的详细情况：

很明显的，这个请求发送了我们的用户名和密码，由此可知，这个请求的作用就是负责在cas server后台验证用户名的密码，验证成功后，会自动重定向到第二个请求
我们再来看第二个请求：

这个请求就是我们cas client所配置的登录地址，此时这个请求后面自动带上了一个名为ticket的参数，参数值是一串自动生成的随机字符串，由cas server生成的
我们再回到后台，没什么错误的话，我们可以看到LoginController接收到了这个参数，我们先在UserDetailsServiceImpl类的loadUserDetails方法的开头打一个断点，按F8让调试器跑走，此时，我们就可以看到调试器跳到了我们刚刚打的UserDetasServiceImpl的断点中，再看看参数

可以看出，我们接收到了cas server认证完ticket后传回来的用户名，我们根据用户名加载对应的权限，返回即可，此时我们再次按F8跳走
再回到界面，发现我们已经可以访问页面了：

下一步，就是验证多个应用之间是否能只登陆一次就不用再登陆了；
我们将当前项目拷贝一份，改名称为cas-client2（maven的groupId和artifactId），再修改一下端口为8082，，记得对应的cas配置也要改：

启动项目
先访问localhost:8082

发现它自动跳转到了8081的cas server
再打开另外一个浏览器标签，访问localhost:8083

发现它也自动跳到了cas的登录页面，我们先在这里输入账号密码登录：

登录成功后，我们再切换回刚刚没登录的8082的网页标签，刷新一下，

ok，8082也不用登陆了，大功告成！

源码地址：

https://github.com/yupingyou/casclient.git

另：Spring security原本默认有个/login和/logout的handler，（以前不是这个地址，不知道从哪个版本开始改了，以前好像是_spring_security_check,大概是这个，记不太清，我用了4以后就发现地址变了），但是我发现我访问/login的时候出现404，但/logout可以访问，没发现什么原因，后来我就自定义一个登陆了，也就是我配置的/login.do，代替了默认的/login

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