Java培训：什么是sMybatisPlus数据安全？

存在数据库中的数据对于普通用户而言是不可见的，好像是藏起来了一样，但对于开发者，只要知道数据库的连接地址、用户名、密码，则数据不再安全；这也意味着，一旦连接数据库的配置文件暴露出去，则数据不再安全。

应用场景

开发中的数据库配置文件或配置中心中的配置信息

API介绍

MybatisPlus中有个针对配置项加密处理的

代码实现

1.创建mp工程

创建maven工程，结构如下：

2.代码编写

pom.xml

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.1</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <scope>provided</scope>
        </dependency>
    </dependencies>

application.yml

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/springboot?useSSL=false&characterEncoding=utf8&serverTimezone=Asia/Shanghai
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: root
mybatis-plus:
  type-aliases-package: com.itheima.pojo

启动类

package com.itheima;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @version 1.0
 * @description 说明
 * @package com.itheima
 */
@SpringBootApplication
@MapperScan(basePackages = "com.itheima.mapper")
public class App {
    public static void main(String[] args) {
        SpringApplication.run(App.class,args);
    }
}

pojo

package com.itheima.pojo;

import com.baomidou.mybatisplus.annotation.TableField;
import lombok.Data;

/**
 * @version 1.0
 * @description 说明
 * @package com.itheima.pojo
 */
@Data
public class User {
    private Integer id;
    private String username;
    @TableField(select = false)
    private String password;
    private String salt;

}

mapper

package com.itheima.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.itheima.pojo.User;
import org.springframework.stereotype.Repository;

/**
 * @version 1.0
 * @description 说明
 * @package com.itheima.mapper
 */
@Repository
public interface UserMapper extends BaseMapper<User> {
}

service接口与实现类

package com.itheima.service;

import com.baomidou.mybatisplus.extension.service.IService;
import com.itheima.pojo.User;

/**
 * @version 1.0
 * @description 说明
 * @package com.itheima.service
 */
public interface UserService extends IService<User> {
}

package com.itheima.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.mapper.UserMapper;
import com.itheima.pojo.User;
import com.itheima.service.UserService;
import org.springframework.stereotype.Service;

/**
 * @version 1.0
 * @description 说明
 * @package com.itheima.service.impl
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {
}

controller

package com.itheima.controller;

import com.itheima.pojo.User;
import com.itheima.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
 * @version 1.0
 * @description 说明
 * @package com.itheima.controller
 */
@RestController
@RequestMapping("user")
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping
    public List<User> listAll(){
        return userService.list();
    }

}

启动测试

生成加密后的内容

package com.itheima;

import com.baomidou.mybatisplus.core.toolkit.AES;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @version 1.0
 * @description 说明
 * @package com.itheima
 */
@SpringBootApplication
@MapperScan(basePackages = "com.itheima.mapper")
public class App {
    public static void main(String[] args) {
        String secretKey = AES.generateRandomKey();
        System.out.println("secretKey:" + secretKey);

        String url = AES.encrypt("jdbc:mysql://localhost:3306/springboot?useSSL=false&characterEncoding=utf8&serverTimezone=Asia/Shanghai", secretKey);
        String username = AES.encrypt("username", secretKey);
        String password = AES.encrypt("password", secretKey);
        System.out.println("url=" +url );
        System.out.println("username=" +username );
        System.out.println("password=" +password );

        SpringApplication.run(App.class,args);
    }
}

替换配置文件

spring:
  datasource:
    url: mpw:wT9PqZ9Hf4VWgXDuZ/Z1JKfdDyS0sSu3+O2qDkJ/Ulnabpq3z1lZbiThWseQ4DQSx3+SWpufsTysjdYhn6Scsa77AzIIaUgv8DZ17gPxAq88AISmxd9OjxidmY50uBVMkGhP9qAted45zuHBzVrw6Q==
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: mpw:Pnh++mI45YrC4s6JveJYaA==
    password: mpw:Pnh++mI45YrC4s6JveJYaA==
mybatis-plus:
  type-aliases-package: com.itheima.pojo

添加启动参数

运行效果

3.优化

目的

启动时，需要指定密钥才能使用，如果我们把它封装到一个jar里，让它启动时自动去加载密钥，且密钥可配置，那这样就更灵活了。

分析

通过查看MybatisPlus加载的源码，其做解密处理的类如下：

/*
 * Copyright (c) 2011-2020, baomidou (jobob@qq.com).
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * <p>
 * https://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.baomidou.mybatisplus.autoconfigure;

import com.baomidou.mybatisplus.core.toolkit.AES;
import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.boot.env.OriginTrackedMapPropertySource;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.MapPropertySource;
import org.springframework.core.env.PropertySource;
import org.springframework.core.env.SimpleCommandLinePropertySource;

import java.util.HashMap;

/**
 * 安全加密处理器
 *
 * @author hubin
 * @since 2020-05-23
 */
public class SafetyEncryptProcessor implements EnvironmentPostProcessor {

    @Override
    public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
        /**
         * 命令行中获取密钥
         */
        String mpwKey = null;
        for (PropertySource<?> ps : environment.getPropertySources()) {
            if (ps instanceof SimpleCommandLinePropertySource) {
                SimpleCommandLinePropertySource source = (SimpleCommandLinePropertySource) ps;
                mpwKey = source.getProperty("mpw.key");
                break;
            }
        }
        /**
         * 处理加密内容
         */
        if (StringUtils.isNotBlank(mpwKey)) {
            HashMap<String, Object> map = new HashMap<>();
            for (PropertySource<?> ps : environment.getPropertySources()) {
                if (ps instanceof OriginTrackedMapPropertySource) {
                    OriginTrackedMapPropertySource source = (OriginTrackedMapPropertySource) ps;
                    for (String name : source.getPropertyNames()) {
                        Object value = source.getProperty(name);
                        if (value instanceof String) {
                            String str = (String) value;
                            if (str.startsWith("mpw:")) {
                                map.put(name, AES.decrypt(str.substring(4), mpwKey));
                            }
                        }
                    }
                }
            }
            // 将解密的数据放入环境变量，并处于第一优先级上
            if (CollectionUtils.isNotEmpty(map)) {
                environment.getPropertySources().addFirst(new MapPropertySource("custom-encrypt", map));
            }
        }
    }
}

其使用了SPI原理，在类所在的jar下的META-INF/spring.factories中配置了这个SafetyEncryptProcessor。那我们能否也来定义一个这样的配置处理器，判断环境配置中是否配置了–mpw.key，如果没有配置，则给它配置上，这样就不用在启动时添加参数来运行了。

实现

创建配置工程mysafe

代码清单

pom.xml

<parent>
    <artifactId>spring-boot-starter-parent</artifactId>
    <groupId>org.springframework.boot</groupId>
    <version>2.3.8.RELEASE</version>
</parent>
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>
</dependencies>

SafetyEncryptProcessor

package com.itheima;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.core.Ordered;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.PropertySource;
import org.springframework.core.env.SimpleCommandLinePropertySource;
import org.springframework.core.io.ClassPathResource;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.util.Properties;

/**
 * @version 1.0
 * @description 说明
 * @package com.itheima
 */
public class SafetyEncryptProcessor implements EnvironmentPostProcessor, Ordered {

    @Override
    public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
        Properties pro = new Properties();
        try {
            pro.load(new ClassPathResource("ert.properties").getInputStream());
        } catch (IOException e) {
            e.printStackTrace();
        }
        /**
         * 命令行中获取密钥
         */
        String mpwKey = null;
        for (PropertySource<?> ps : environment.getPropertySources()) {
            if (ps instanceof SimpleCommandLinePropertySource) {
                SimpleCommandLinePropertySource source = (SimpleCommandLinePropertySource) ps;
                mpwKey = source.getProperty("mpw.key");
                break;
            }
        }
        if(StringUtils.isEmpty(mpwKey)){
            environment.getPropertySources().addFirst(new SimpleCommandLinePropertySource("mySpringApplicationCommandLineArgs", "--mpw.key=" + pro.getProperty("ert.version")));
        }
    }

    @Override
    public int getOrder() {
        return 0;
    }
}

spring.factories

“`.properties

ert.version=b440fe7fd55dbe26

org.springframework.boot.env.EnvironmentPostProcessor=\

com.itheima.SafetyEncryptProcessor

“`

ert.properties

“`properties

ert.version=2ac6625cb3188f52

“`

安装到本地仓库

修改mp工程添加依赖

修改pom.xml，添加mysafe的依赖

<dependency>
    <groupId>com.itheima</groupId>
    <artifactId>mysafe</artifactId>
    <version>1.0-SNAPSHOT</version>
</dependency>

4.测试结果

去除启动时的参数设置。再启动后访问页面、效果如下：

总结

1.MybatisPlus利用了springboot的配置信息增强器与SPI机制来实现对配置文件中敏感数据的解密处理。

2.mysafe工程打成的jar包，将来就上传到企业的内部服务器上，当密钥变更时，重新打包即可。

3.而我们将来布署项目到服务器上时，也肯定存在配置文件，一旦配置信息暴露，则数据库就危险了。通过加密手段能够让破解者增加破解阻碍。

4.此次练习仅做抛砖引玉作用，关于加密与解密是没有做到那么严谨的，需要结合自己公司实际情况去调整。