Spring Security 基于URL的权限判断源码解析

目录

• 1. FilterSecurityInterceptor 源码阅读
• 2. 自定义基于url的授权

1. FilterSecurityInterceptor 源码阅读

org.springframework.security.web.access.intercept.FilterSecurityInterceptor

通过过滤器实现对HTTP资源进行安全处理。

该安全拦截器所需的 SecurityMetadataSource 类型为 FilterInvocationSecurityMetadataSource。

doFilter方法中直接调用invoke方法

基本都是调用父类的方法，那下面就重点看下父类 AbstractSecurityInterceptor中相关方法

为安全对象实现安全拦截的抽象类。

AbstractSecurityInterceptor 将确保安全拦截器的正确启动配置。 它还将实现对安全对象调用的正确处理，即：

1.从 SecurityContextHolder 获取 Authentication 对象。

2.通过在SecurityMetadataSource中查找安全对象请求，确定请求是与安全调用还是公共调用相关（PS：简单地来讲，就是看一下请求的资源是不是受保护的，受保护的就是安全调用，就要权限，不受保护的就不需要权限就可以访问）。

3.对于受保护的调用（有一个用于安全对象调用的 ConfigAttributes 列表）：

• 如果 Authentication.isAuthenticated() 返回 false，或者 alwaysReauthenticate 为 true，则根据配置的 AuthenticationManager 对请求进行身份验证。 通过身份验证后，将 SecurityContextHolder 上的 Authentication 对象替换为返回值。
•  根据配置的AccessDecisionManager授权请求。
• 通过配置的RunAsManager执行任何run-as替换。
• 将控制权传递回具体的子类，它实际上将继续执行对象。返回一个 InterceptorStatusToken 以便在子类完成对象的执行后，其 finally 子句可以确保 AbstractSecurityInterceptor 被调用并使用 finallyInvocation(InterceptorStatusToken) 正确处理。
• 具体的子类将通过 afterInvocation(InterceptorStatusToken, Object) 方法重新调用 AbstractSecurityInterceptor。
• 如果 RunAsManager 替换了 Authentication 对象，则将 SecurityContextHolder 返回到调用 AuthenticationManager 后存在的对象。
• 如果定义了AfterInvocationManager，则调用它并允许它替换将要返回给调用者的对象。

4.对于公开的调用（安全对象调用没有 ConfigAttributes）：

如上所述，具体的子类将返回一个 InterceptorStatusToken，在执行完安全对象后，该 InterceptorStatusToken 随后被重新呈现给 AbstractSecurityInterceptor。 AbstractSecurityInterceptor 在它的 afterInvocation(InterceptorStatusToken, Object) 被调用时不会采取进一步的行动。

5.控制再次返回到具体的子类，以及应该返回给调用者的对象。然后子类会将该结果或异常返回给原始调用者。

下面具体来看

从这里我们可以知道返回null和空集合是一样的。

接下来看授权

这是我们要重点关注的，可以看到，授权靠的是accessDecisionManager.decide(authenticated, object, attributes)

因此，我们想要实现自己的基于请求Url的授权只需自定义一个 AccessDecisionManager即可

接下来，我们来具体实现一下

2. 自定义基于url的授权

先把Spring Security授权的大致流程流程摆在这儿：

自定义FilterInvocationSecurityMetadataSource

package com.example.security.core;

import com.example.security.service.SysPermissionService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.access.SecurityConfig;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;

/**
 * @Author ChengJianSheng
 * @Date 2021/12/2
 */
@Component
public class MyFilterSecurityMetadataSource implements FilterInvocationSecurityMetadataSource {

    @Autowired
    private SysPermissionService sysPermissionService;

    private final AntPathMatcher antPathMatcher = new AntPathMatcher();

    @Override
    public Collection<ConfigAttribute> getAttributes(Object object) throws IllegalArgumentException {
        FilterInvocation fi = (FilterInvocation) object;
        String url = fi.getRequestUrl();
        String httpMethod = fi.getRequest().getMethod();

        List<ConfigAttribute> attributes = new ArrayList<>();

        Map<String, String> urlRoleMap = sysPermissionService.getAllUrlRole();

        for (Map.Entry<String, String> entry : urlRoleMap.entrySet()) {
            if (antPathMatcher.match(entry.getKey(), url)) {
                return SecurityConfig.createList(entry.getValue());
            }
        }

        // 返回null和空列表是一样的，都表示当前访问的资源不需要权限，所有人都可以访问
        return attributes;
//        return null;
    }

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

    @Override
    public boolean supports(Class<?> clazz) {
        return FilterInvocation.class.isAssignableFrom(clazz);
    }
}

这里需要说明一下，其实Spring Security里面说的role不一定表示的是我们自己建的那个角色表，我们可以这样理解，就是它这里的所谓role只是一个权限标识。我们在建表的时候，通常最基本的是5张表（用户表、角色表、权限表、用户角色关系表、角色权限关系表），我们可以把受保护的资源（通常是一个url）与角色关联起来，建立哪些角色可以访问哪些资源，也可以直接判断资源的权限（通常是权限编码/标识）。

只要有这个关系，剩下的就是写法不同而已。如果你把role理解成资源的权限标识的话，那么返回的Collection<ConfigAttribute>中就最多有一个元素，如果理解成角色的话，那么可能有多个元素。就这么点儿东西，写法不同而已，本质是一样的。

自定义AccessDecisionManager

package com.example.security.core;

import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Component;

import java.util.Collection;

/**
 * @Author ChengJianSheng
 * @Date 2021/12/2
 */
@Component
public class MyAccessDecisionManager implements AccessDecisionManager {
    @Override
    public void decide(Authentication authentication, Object object, Collection<ConfigAttribute> configAttributes) throws AccessDeniedException, InsufficientAuthenticationException {
        Collection<? extends GrantedAuthority> authorities = authentication.getAuthorities();
        System.out.println(authorities);
        System.out.println(configAttributes);
        //  查看当前用户是否有对应的权限访问该保护资源
        for (ConfigAttribute attribute : configAttributes) {
            for (GrantedAuthority authority : authorities) {
                if (authority.getAuthority().equals(attribute.getAttribute())) {
                    return;
                }
            }
        }
        throw new AccessDeniedException("Access is denied");
    }

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

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

decide方法的三个参数，依次表示：

• 调用者（非空）
• 被调用的安全对象
• 与被调用的安全对象关联的配置属性

配置WebSecurityConfig

package com.example.security.config;

import com.example.security.core.MyAccessDecisionManager;
import com.example.security.core.MyFilterSecurityMetadataSource;
import com.example.security.core.MyUserDetailsService;
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.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.access.intercept.FilterSecurityInterceptor;

/**
 * @Author ChengJianSheng
 * @Date 2021/12/6
 */
@Configuration
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private MyUserDetailsService myUserDetailsService;
    @Autowired
    private MyAccessDecisionManager myAccessDecisionManager;
    @Autowired
    private MyFilterSecurityMetadataSource myFilterSecurityMetadataSource;

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

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.formLogin()
                .and()
                .authorizeRequests()
                .withObjectPostProcessor(new ObjectPostProcessor<FilterSecurityInterceptor>() {
                    @Override
                    public <O extends FilterSecurityInterceptor> O postProcess(O object) {
                        object.setSecurityMetadataSource(myFilterSecurityMetadataSource);
                        object.setAccessDecisionManager(myAccessDecisionManager);
                        return object;
                    }
                })
                .anyRequest().authenticated();
    }

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

}

其它不重要的就直接贴出来了

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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>security-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>security-demo</name>

    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/demo126?serverTimezone=Asia/Shanghai&characterEncoding=utf8&useSSL=false
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: 123456
  jpa:
    database: mysql
    show-sql: true

SysPermissionEntity.java

package com.example.security.entity;

import lombok.Getter;
import lombok.Setter;

import javax.persistence.*;
import java.io.Serializable;

/**
 * @Author ChengJianSheng
 * @Date 2021/12/6
 */
@Getter
@Setter
@Entity
@Table(name = "sys_permission")
public class SysPermissionEntity implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;

    /** 权限编码（标识） */
    private String code;

    /** 权限名称 */
    private String name;

    /** 权限URL */
    private String url;

}

SysRoleEntity.java

package com.example.security.entity;

import lombok.Getter;
import lombok.Setter;

import javax.persistence.*;
import java.io.Serializable;
import java.util.Set;

/**
 * @Author ChengJianSheng
 * @Date 2021/12/6
 */
@Getter
@Setter
@Entity
@Table(name = "sys_role")
public class SysRoleEntity implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;

    /** 角色编码 */
    private String code;

    /** 角色名称 */
    private String name;

    @ManyToMany
    @JoinTable(name = "sys_role_permission", joinColumns = {@JoinColumn(name = "role_id")}, inverseJoinColumns = {@JoinColumn(name = "permission_id")})
    private Set<SysPermissionEntity> permissions;
}

SysUserEntity.java

package com.example.security.entity;

import lombok.Getter;
import lombok.Setter;

import javax.persistence.*;
import java.io.Serializable;
import java.util.Set;

/**
 * @Author ChengJianSheng
 * @Date 2021/12/6
 */
@Getter
@Setter
@Entity
@Table(name = "sys_user")
public class SysUserEntity implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;

    /** 用户名 */
    private String username;

    /** 密码 */
    private String password;

    @ManyToMany
    @JoinTable(name = "sys_user_role",
            joinColumns = {@JoinColumn(name = "user_id")},
            inverseJoinColumns = {@JoinColumn(name = "role_id")})
    private Set<SysRoleEntity> roles;
}

SysUserRepository.java

package com.example.security.repository;

import com.example.security.entity.SysUserEntity;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;

/**
 * @Author ChengJianSheng
 * @Date 2021/12/6
 */
public interface SysUserRepository extends JpaRepository<SysUserEntity, Integer>, JpaSpecificationExecutor<SysUserEntity> {

    SysUserEntity findByUsername(String username);
}

SysPermissionServiceImpl.java

package com.example.security.service.impl;

import com.example.security.entity.SysPermissionEntity;
import com.example.security.repository.SysPermissionRepository;
import com.example.security.service.SysPermissionService;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * @Author ChengJianSheng
 * @Date 2021/12/6
 */
@Service
public class SysPermissionServiceImpl implements SysPermissionService {

    @Resource
    private SysPermissionRepository sysPermissionRepository;

    @Override
    public Map<String, String> getAllUrlRole() {
        List<SysPermissionEntity> list = sysPermissionRepository.findAll();
        return list.stream().collect(Collectors.toMap(SysPermissionEntity::getUrl, SysPermissionEntity::getCode));
    }
}

MyUserDetails.java

package com.example.security.domain;

import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;

import java.util.Collection;
import java.util.Set;

/**
 * @Author ChengJianSheng
 * @Date 2021/12/6
 */
@NoArgsConstructor
@AllArgsConstructor
public class MyUserDetails implements UserDetails {

    private String username;
    private String password;
    private boolean enabled;
    private Set<SimpleGrantedAuthority> authorities;

    @Override
    public Collection<? extends GrantedAuthority> getAuthorities() {
        return authorities;
    }

    @Override
    public String getPassword() {
        return password;
    }

    @Override
    public String getUsername() {
        return username;
    }

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

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

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

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

MyUserDetailsService.java

package com.example.security.core;

import com.example.security.domain.MyUserDetails;
import com.example.security.entity.SysPermissionEntity;
import com.example.security.entity.SysUserEntity;
import com.example.security.repository.SysUserRepository;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
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;

import javax.annotation.Resource;
import javax.transaction.Transactional;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * @Author ChengJianSheng
 * @Date 2021/12/6
 */
@Transactional
@Service
public class MyUserDetailsService implements UserDetailsService {

    @Resource
    private SysUserRepository sysUserRepository;

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        SysUserEntity sysUserEntity = sysUserRepository.findByUsername(username);
        if (null == sysUserEntity) {
            throw new UsernameNotFoundException("用户不存在");
        }
        Set<SimpleGrantedAuthority> authorities = sysUserEntity.getRoles().stream()
                .flatMap(roleId->roleId.getPermissions().stream())
                .map(SysPermissionEntity::getCode)
                .map(SimpleGrantedAuthority::new)
                .collect(Collectors.toSet());

        return new MyUserDetails(sysUserEntity.getUsername(), sysUserEntity.getPassword(), true, authorities);
    }
}

HelloController.java

package com.example.security.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @Author ChengJianSheng
 * @Date 2021/12/6
 */
@RestController
@RequestMapping("/hello")
public class HelloController {

    @GetMapping("/sayHello")
    public String sayHello() {
        return "Hello";
    }

    @GetMapping("/sayHi")
    public String sayHi() {
        return "Hi";
    }
}

数据库脚本如下

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for sys_permission
-- ----------------------------
DROP TABLE IF EXISTS `sys_permission`;
CREATE TABLE `sys_permission`  (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `code` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '权限编码（标识）',
  `name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '权限名称',
  `url` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '权限URL',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 5 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of sys_permission
-- ----------------------------
INSERT INTO `sys_permission` VALUES (1, 'home', '首页', '/home/**');
INSERT INTO `sys_permission` VALUES (2, 'user:add', '添加用户', '/user/add');
INSERT INTO `sys_permission` VALUES (3, 'user:delete', '删除用户', '/user/delete');
INSERT INTO `sys_permission` VALUES (4, 'hello:sayHello', '打招呼', '/hello/sayHello');

-- ----------------------------
-- Table structure for sys_role
-- ----------------------------
DROP TABLE IF EXISTS `sys_role`;
CREATE TABLE `sys_role`  (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `code` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '角色编码',
  `name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '角色名称',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 4 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of sys_role
-- ----------------------------
INSERT INTO `sys_role` VALUES (1, 'employee', '员工');
INSERT INTO `sys_role` VALUES (2, 'engineer', '工程师');
INSERT INTO `sys_role` VALUES (3, 'leader', '组长');

-- ----------------------------
-- Table structure for sys_role_permission
-- ----------------------------
DROP TABLE IF EXISTS `sys_role_permission`;
CREATE TABLE `sys_role_permission`  (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `role_id` int(11) NOT NULL COMMENT '角色ID',
  `permission_id` int(11) NOT NULL COMMENT '权限ID',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 8 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of sys_role_permission
-- ----------------------------
INSERT INTO `sys_role_permission` VALUES (1, 1, 1);
INSERT INTO `sys_role_permission` VALUES (2, 2, 1);
INSERT INTO `sys_role_permission` VALUES (3, 2, 2);
INSERT INTO `sys_role_permission` VALUES (4, 3, 1);
INSERT INTO `sys_role_permission` VALUES (5, 3, 2);
INSERT INTO `sys_role_permission` VALUES (6, 3, 3);
INSERT INTO `sys_role_permission` VALUES (7, 3, 4);

-- ----------------------------
-- Table structure for sys_user
-- ----------------------------
DROP TABLE IF EXISTS `sys_user`;
CREATE TABLE `sys_user`  (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '用户名',
  `password` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '密码',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 2 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of sys_user
-- ----------------------------
INSERT INTO `sys_user` VALUES (1, 'zhangsan', '$2a$10$e4wFsFHQCNjPe5tTJMPkRuKGwmMGC45pfjMupY9nwbTuoKQ0bKc/u');

-- ----------------------------
-- Table structure for sys_user_role
-- ----------------------------
DROP TABLE IF EXISTS `sys_user_role`;
CREATE TABLE `sys_user_role`  (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `user_id` int(11) NOT NULL COMMENT '用户ID',
  `role_id` int(11) NOT NULL COMMENT '角色ID',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 4 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of sys_user_role
-- ----------------------------
INSERT INTO `sys_user_role` VALUES (1, 1, 1);
INSERT INTO `sys_user_role` VALUES (2, 1, 2);
INSERT INTO `sys_user_role` VALUES (3, 1, 3);

SET FOREIGN_KEY_CHECKS = 1;

浏览器访问http://localhost:8080/hello/sayHi 正常返回，不用登录，因为没有在sys_permission表中配置该资源，也就是说它不是一个受保护的资源（公开资源）

访问http://localhost:8080/hello/sayHello则需要先登录，用zhangsan登录成功以后正确返回

项目结构如下

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