Java培訓：什么是sMybatisPlus數據安全？

存在數據庫中的數據對于普通用戶而言是不可見的，好像是藏起來了一樣，但對于開發者，只要知道數據庫的連接地址、用戶名、密碼，則數據不再安全；這也意味著，一旦連接數據庫的配置文件暴露出去，則數據不再安全。

應用場景

開發中的數據庫配置文件或配置中心中的配置信息

API介紹

MybatisPlus中有個針對配置項加密處理的

代碼實現

1.創建mp工程

創建maven工程，結構如下：

2.代碼編寫

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

啟動類

package com.itheima;

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

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

service接口與實現類

package com.itheima.service;

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

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

    @Autowired
    private UserService userService;

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

}

啟動測試

生成加密后的內容

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 說明
 * @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);
    }
}

替換配置文件

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

添加啟動參數

運行效果

3.優化

目的

啟動時，需要指定密鑰才能使用，如果我們把它封裝到一個jar里，讓它啟動時自動去加載密鑰，且密鑰可配置，那這樣就更靈活了。

分析

通過查看MybatisPlus加載的源碼，其做解密處理的類如下：

/*
 * 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;

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

    @Override
    public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
        /**
         * 命令行中獲取密鑰
         */
        String mpwKey = null;
        for (PropertySource<?> ps : environment.getPropertySources()) {
            if (ps instanceof SimpleCommandLinePropertySource) {
                SimpleCommandLinePropertySource source = (SimpleCommandLinePropertySource) ps;
                mpwKey = source.getProperty("mpw.key");
                break;
            }
        }
        /**
         * 處理加密內容
         */
        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));
                            }
                        }
                    }
                }
            }
            // 將解密的數據放入環境變量，并處于第一優先級上
            if (CollectionUtils.isNotEmpty(map)) {
                environment.getPropertySources().addFirst(new MapPropertySource("custom-encrypt", map));
            }
        }
    }
}

其使用了SPI原理，在類所在的jar下的META-INF/spring.factories中配置了這個SafetyEncryptProcessor。那我們能否也來定義一個這樣的配置處理器，判斷環境配置中是否配置了–mpw.key，如果沒有配置，則給它配置上，這樣就不用在啟動時添加參數來運行了。

實現

創建配置工程mysafe

代碼清單

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 說明
 * @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();
        }
        /**
         * 命令行中獲取密鑰
         */
        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

“`

安裝到本地倉庫

修改mp工程添加依賴

修改pom.xml，添加mysafe的依賴

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

4.測試結果

去除啟動時的參數設置。再啟動后訪問頁面、效果如下：

總結

1.MybatisPlus利用了springboot的配置信息增強器與SPI機制來實現對配置文件中敏感數據的解密處理。

2.mysafe工程打成的jar包，將來就上傳到企業的內部服務器上，當密鑰變更時，重新打包即可。

3.而我們將來布署項目到服務器上時，也肯定存在配置文件，一旦配置信息暴露，則數據庫就危險了。通過加密手段能夠讓破解者增加破解阻礙。

4.此次練習僅做拋磚引玉作用，關于加密與解密是沒有做到那么嚴謹的，需要結合自己公司實際情況去調整。