springsecurity-jwt整合

2 springsecurity-jwt整合

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2.1整合springsecurity

1）

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
</dependency>

2.2认证授权流程

认证管理

流程图解读：

1、用户提交用户名、密码被SecurityFilterChain中的 UsernamePasswordAuthenticationFilter 过滤器获取到， 封装为请求Authentication，通常情况下是UsernamePasswordAuthenticationToken这个实现类。

2、然后过滤器将Authentication提交至认证管理器（AuthenticationManager）进行认证 。

3、认证成功后， AuthenticationManager 身份管理器返回一个被填充满了信息的（包括上面提到的权限信息， 身份信息，细节信息，但密码通常会被移除） Authentication 实例。

4、SecurityContextHolder 安全上下文容器将第3步填充了信息的 Authentication ，通过 SecurityContextHolder.getContext().setAuthentication(…)方法，设置到其中。 可以看出AuthenticationManager接口（认证管理器）是认证相关的核心接口，也是发起认证的出发点，它 的实现类为ProviderManager。而Spring Security支持多种认证方式，因此ProviderManager维护着一个 List 列表，存放多种认证方式，最终实际的认证工作是由 AuthenticationProvider完成的。咱们知道web表单的对应的AuthenticationProvider实现类为 DaoAuthenticationProvider，它的内部又维护着一个UserDetailsService负责UserDetails的获取。最终 AuthenticationProvider将UserDetails填充至Authentication。

授权管理

访问资源（即授权管理），访问url时，会通过FilterSecurityInterceptor拦截器拦截，其中会调用SecurityMetadataSource的方法来获取被拦截url所需的全部权限，再调用授权管理器AccessDecisionManager，这个授权管理器会通过spring的全局缓存SecurityContextHolder获取用户的权限信息，还会获取被拦截的url和被拦截url所需的全部权限，然后根据所配的投票策略（有：一票决定，一票否定，少数服从多数等），如果权限足够，则决策通过，返回访问资源，请求放行，否则跳转到403页面、自定义页面。

2.3编写自己的UserDetails和UserDetailService

2.3.1UserDetails

package com.ds.book.entity;

import com.baomidou.mybatisplus.annotation.TableName;
import java.io.Serializable;
import java.util.Collection;

import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;

/**
 * <p>
 *
 * </p>
 *
 * @author java大师
 * @since 2023-03-17
 */
@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@TableName("t_user")
public class User implements Serializable, UserDetails {

    private static final long serialVersionUID = 1L;

    private Integer id;

    /**
     * 登录名
     */
    private String name;

    /**
     * 用户名
     */
    private String username;

    /**
     * 密码
     */
    private String password;

    /**
     * 是否有效：1-有效；0-无效
     */
    private String status;

    @Override
    public Collection<? extends GrantedAuthority> getAuthorities() {
        return roles
                .stream()
                .map(role -> new SimpleGrantedAuthority(role.getRoleCode()))
                .collect(Collectors.toList());
    }

    @Override
    public boolean isAccountNonExpired() {
        return true;
    }

    @Override
    public boolean isAccountNonLocked() {
        return true;
    }

    @Override
    public boolean isCredentialsNonExpired() {
        return true;
    }

    @Override
    public boolean isEnabled() {
        return true;
    }
}

2.3.2userDetailService

登录成功后，将UserDetails的roles设置到用户中

package com.ds.book.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.ds.book.entity.User;
import com.ds.book.mapper.UserMapper;
import com.ds.book.service.IUserService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
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.Service;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author java大师
 * @since 2023-03-17
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService, UserDetailsService {

    @Autowired
    private UserMapper userMapper;

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User loginUser = userMapper.selectOne(new QueryWrapper<User>().eq("username", username));
        if (loginUser == null){
            throw new UsernameNotFoundException("用户名或密码错误");
        }
        loginUser.setRoles(userMapper.getRolesByUserId(loginUser.getId()));
        return loginUser;
    }
}

2.3.2加载userDetailService

将我们自己的UserDetailService注入springsecurity

package com.ds.book.config;

import com.ds.book.filter.JwtTokenFilter;
import com.ds.book.service.impl.UserServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.ObjectPostProcessor;
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.WebSecurityConfigurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.access.intercept.FilterSecurityInterceptor;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private UserServiceImpl userService;

    @Bean
    public PasswordEncoder passwordEncoder(){
        return new BCryptPasswordEncoder();
    }

    //注入我们自己的UserDetailService
    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userService).passwordEncoder(passwordEncoder());
    }
}

问题：前后端分离项目，通常不会使用springsecurity自带的登录界面，登录界面由前端完成，后台只需要提供响应的服务即可，且目前主流不会采用session去存取用户，后端会返回响应的token，前端访问的时候，会在headers里面带入token.

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-pW7SxQqz-1679881634010)(D:\个人\公众号\网站\dsblog开发手册\image-20230322114008186.png)]

2.4JwtToken

2.4.1 JWT描述

Jwt token由Header、Payload、Signature三部分组成，这三部分之间以小数点”.”连接，JWT token长这样：

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.keH6T3x1z7mmhKL1T3r9sQdAxxdzB6siemGMr_6ZOwU

token解析后长这样：

header部分，有令牌的类型(JWT)和签名算法名称(HS256)：

{

"alg": "HS256",

"typ": "JWT"

}

Payload部分，有效负载，这部分可以放任何你想放的数据：

{

"sub": "1234567890",

"name": "John Doe",

"iat": 1516239022

}

Signature签名部分，由于这部分是使用header和payload部分计算的，所以还可以以此来验证payload部分有没有被篡改：

HMACSHA256(

base64UrlEncode(header) + "." +

base64UrlEncode(payload),

123456 //这里是密钥，只要够复杂，一般不会被破解

)

2.4.2 pom.xml

<dependency>
    <groupId>io.jsonwebtoken</groupId>
    <artifactId>jjwt</artifactId>
    <version>0.9.0</version>
</dependency>

2.4.3 JwtToken工具类

package com.ds.book.tool;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtBuilder;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;

import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;
import java.util.Date;
import java.util.UUID;

/**
 * JWT工具类
 */
public class JwtUtil {

    //有效期为
    public static final Long JWT_TTL = 60 * 60 *1000L;// 60 * 60 *1000  一个小时
    //设置秘钥明文
    public static final String JWT_KEY = "dashii";

    public static String getUUID(){
        String token = UUID.randomUUID().toString().replaceAll("-", "");
        return token;
    }

    /**
     * 生成jtw
     * @param subject token中要存放的数据（json格式）
     * @return
     */
    public static String createJWT(String subject) {
        JwtBuilder builder = getJwtBuilder(subject, null, getUUID());// 设置过期时间
        return builder.compact();
    }

    /**
     * 生成jtw
     * @param subject token中要存放的数据（json格式）
     * @param ttlMillis token超时时间
     * @return
     */
    public static String createJWT(String subject, Long ttlMillis) {
        JwtBuilder builder = getJwtBuilder(subject, ttlMillis, getUUID());// 设置过期时间
        return builder.compact();
    }

    private static JwtBuilder getJwtBuilder(String subject, Long ttlMillis, String uuid) {
        SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.HS256;
        SecretKey secretKey = generalKey();
        long nowMillis = System.currentTimeMillis();
        Date now = new Date(nowMillis);
        if(ttlMillis==null){
            ttlMillis= JwtUtil.JWT_TTL;
        }
        long expMillis = nowMillis + ttlMillis;
        Date expDate = new Date(expMillis);
        return Jwts.builder()
                .setId(uuid)              //唯一的ID
                .setSubject(subject)   // 主题  可以是JSON数据
                .setIssuer("dashi")     // 签发者
                .setIssuedAt(now)      // 签发时间
                .signWith(signatureAlgorithm, secretKey) //使用HS256对称加密算法签名, 第二个参数为秘钥
                .setExpiration(expDate);
    }

    /**
     * 创建token
     * @param id
     * @param subject
     * @param ttlMillis
     * @return
     */
    public static String createJWT(String id, String subject, Long ttlMillis) {
        JwtBuilder builder = getJwtBuilder(subject, ttlMillis, id);// 设置过期时间
        return builder.compact();
    }

    /**
     * 生成加密后的秘钥 secretKey
     * @return
     */
    public static SecretKey generalKey() {
        byte[] encodedKey = Base64.getDecoder().decode(JwtUtil.JWT_KEY);
        SecretKey key = new SecretKeySpec(encodedKey, 0, encodedKey.length, "AES");
        return key;
    }

    /**
     * 解析
     *
     * @param jwt
     * @return
     * @throws Exception
     */
    public static Claims parseJWT(String jwt) throws Exception {
        SecretKey secretKey = generalKey();
        return Jwts.parser()
                .setSigningKey(secretKey)
                .parseClaimsJws(jwt)
                .getBody();
    }
}

2.4.4 JwtTokenFilter

package com.ds.book.filter;

import com.ds.book.entity.User;
import com.ds.book.mapper.UserMapper;
import com.ds.book.service.IMenuService;
import com.ds.book.service.IUserService;
import com.ds.book.tool.JwtUtil;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Component
public class JwtTokenFilter extends OncePerRequestFilter {

    @Autowired
    private IUserService userService;
    @Autowired
    private UserMapper userMapper;

    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
        //1、获取token
        String token = httpServletRequest.getHeader("token");
        if (StringUtils.isEmpty(token)){
            filterChain.doFilter(httpServletRequest,httpServletResponse);
            return;
        }
        String userId;
        try {
            Claims claims = JwtUtil.parseJWT(token);
            userId = claims.getSubject();
        } catch (Exception exception) {
            exception.printStackTrace();
            throw new RuntimeException("token非法");
        }
        User user = userService.getUserById(Integer.parseInt(userId));
        user.setRoles(userMapper.getRolesByUserId(Integer.parseInt(userId)));
        UsernamePasswordAuthenticationToken authenticationToken =
                new UsernamePasswordAuthenticationToken(user,null,user.getAuthorities());
        SecurityContextHolder.getContext().setAuthentication(authenticationToken);
        filterChain.doFilter(httpServletRequest,httpServletResponse);
    }
}

在springsecurity中，第一个经过的过滤器是UsernamePasswordAuthenticationFilter，所以前后端分离的项目，我们自己定义的过滤器要放在这个过滤器前面，具体配置如下

@Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable()
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .authorizeRequests()
                .antMatchers("/login").permitAll()
                .anyRequest().authenticated();
        http.addFilterBefore(jwtTokenFilter, UsernamePasswordAuthenticationFilter.class);
        http.cors();
    }

2.4.5授权

2.4.5.1 开启preAuthorize进行收取（Controller路径匹配）

1）主启动类上添加EnableGlobalMethodSecurity注解

@EnableGlobalMethodSecurity(prePostEnabled = true)
@SpringBootApplication
@MapperScan("com.ds.book.mapper")
public class BookSysApplication {
    public static void main(String[] args) {
        SpringApplication.run(BookSysApplication.class,args);
    }
}

2）Controller方法上添加@PreAuthorize注解

@RestController
public class HelloController {

    @GetMapping("/hello")
    @PreAuthorize("hasRole('ROLE_ADMIN')")
    public String hello(){
        return "hello";
    }
}

2.4.5.2 增强方式授权（数据库表配置）

1）创建我们自己的FilterInvocationSecurityMetadataSource，实现getAttributes方法，获取请求url所需要的角色

@Component
public class MySecurtiMetaDataSource implements FilterInvocationSecurityMetadataSource {

    @Autowired
    private IMenuService menuService;
    AntPathMatcher antPathMatcher = new AntPathMatcher();

    //获取访问url需要的角色，例如：/sys/user需要ROLE_ADMIN角色，访问sys/user时获取到必须要有ROLE_ADMIN角色。返回		Collection<ConfigAttribute>
    @Override
    public Collection<ConfigAttribute> getAttributes(Object object) throws IllegalArgumentException {
        String requestURI = ((FilterInvocation) object).getRequest().getRequestURI();
        //获取所有的菜单及角色
        List<Menu> menus = menuService.getMenus();
        for (Menu menu : menus) {
            if (antPathMatcher.match(menu.getUrl(),requestURI)){
                String[] roles = menu.getRoles().stream().map(role -> role.getRoleCode()).toArray(String[]::new);
                return SecurityConfig.createList(roles);
            }
        }
        return null;
    }

    @Override
    public Collection<ConfigAttribute> getAllConfigAttributes() {
        return null;
    }

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

2）创建我们自己的决策管理器AccessDecisionManager，实现decide方法，判断步骤1）中获取到的角色和我们目前登录的角色是否相同，相同则允许访问，不相同则不允许访问,

@Component
public class MyAccessDecisionManager implements AccessDecisionManager {

    //1、认证通过后，会往authentication中填充用户信息
    //2、拿authentication中的权限与上一步获取到的角色信息进行比对，比对成功后，允许访问
    @Override
    public void decide(Authentication authentication, Object object, Collection<ConfigAttribute> configAttributes) throws AccessDeniedException, InsufficientAuthenticationException {
        Collection<? extends GrantedAuthority> authorities = authentication.getAuthorities();
        for (ConfigAttribute configAttribute : configAttributes) {
            for (GrantedAuthority authority : authorities) {
                if (authority.getAuthority().equals(configAttribute.getAttribute())){
                    return;
                }
            }
        }
        throw new AccessDeniedException("权限不足，请联系管理员");
    }

    @Override
    public boolean supports(ConfigAttribute attribute) {
        return false;
    }

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

3）在SecurityConfig中，添加后置处理器（增强器），让springsecurity使用我们自己的datametasource和decisionMananger

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private MySecurtiMetaDataSource mySecurtiMetaDataSource;
    @Autowired
    private MyAccessDecisionManager myAccessDecisionManager;
    @Autowired
    private MyAuthenticationEntryPoint myAuthenticationEntryPoint;
    @Autowired
    private MyAccessDeniedHandler myAccessDeniedHandler;

    @Autowired
    private UserServiceImpl userService;

    @Autowired
    private JwtTokenFilter jwtTokenFilter;

    @Bean
    public PasswordEncoder passwordEncoder(){
        return new BCryptPasswordEncoder();
    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userService).passwordEncoder(passwordEncoder());
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable()
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .authorizeRequests()
                .antMatchers("/login").permitAll()
                .anyRequest().authenticated()
            	//后置处理器，使用我们自己的FilterSecurityInterceptor拦截器配置
                .withObjectPostProcessor(new ObjectPostProcessor<FilterSecurityInterceptor> () {
                    @Override
                    public <O extends FilterSecurityInterceptor> O postProcess(O o) {
                        o.setSecurityMetadataSource(mySecurtiMetaDataSource);
                        o.setAccessDecisionManager(myAccessDecisionManager);
                        return o;
                    }
                })
                .and()
                .headers().cacheControl();
        http.addFilterBefore(jwtTokenFilter, UsernamePasswordAuthenticationFilter.class);
        http.cors();
    }
}

2.4.6异常处理

1）前端渲染工具类

public class WebUtils
{
    /**
     * 将字符串渲染到客户端
     *
     * @param response 渲染对象
     * @param string 待渲染的字符串
     * @return null
     */
    public static String renderString(HttpServletResponse response, String string) {
        try
        {
            response.setStatus(200);
            response.setContentType("application/json");
            response.setCharacterEncoding("utf-8");
            response.getWriter().print(string);
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        return null;
    }
}

2）未登录异常处理，实现commence方法

@Component
public class MyAuthenticationEntryPoint implements AuthenticationEntryPoint {
    @Override
    public void commence(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, AuthenticationException e) throws IOException, ServletException {
        Result result = new Result(401,"未登录，请先登录",null);
        String json = JSON.toJSONString(result);
        WebUtils.renderString(httpServletResponse,json);

    }
}

3）授权失败异常处理，实现Handle方法

@Component
public class MyAccessDeniedHandler implements AccessDeniedHandler {
    @Override
    public void handle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, AccessDeniedException e) throws IOException, ServletException {
        Result result = new Result(403,"权限不足请联系管理员",null);
        String s = JSON.toJSONString(result);
        WebUtils.renderString(httpServletResponse,s);
    }
}