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README
Apache-2.0

代码混淆之class-winter


仓库最新版本

maven

郑重声明

class-winter 是本人在学习完 class-final(v1.1.9) 后,仿照class-final进行编写的,部分思路与class-final一致

环境要求

  • 支持jdk8语法的环境即可

    本人构建class-winter时,用的jdk版本为:1.8.0_281

    注:tomcat版本不能低于8(部分小版本低的tomcat8可能也不行),否则可能报错

    org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost...

    注:如果有兼容低版本jdk的需求,可以自己下载master分支代码,进行对应修改

功能与特性

  • 支持war(普通war+可执行war)加密
  • 支持jar(普通jar+可执行jar)加密
  • 支持xml加密(掩耳盗铃版)

加密

  • 方式一:通过maven插件自动加密

    <!--
        class-winter插件``
        注:自Maven3.0.3起, 绑定到同一phase的Maven插件将按照pom.xml中声明的顺序执行
        注:此插件最好放置在同一phase的最后执行。
        注:此插件不具备打包功能,需要在此插件前有打包插件进行项目打包,否则加密不会生效。
    -->
    <plugin>
        <groupId>com.idea-aedi</groupId>
        <artifactId>class-winter-maven-plugin</artifactId>
        <version>2.8.9</version>
        <!-- 相关配置 -->
        <configuration>
            <!-- <finalName></finalName>-->
            <includePrefix>加密范围</includePrefix>
            <!-- <originJarOrWar>非必填(不填则自动获取)</originJarOrWar>-->
            <!-- <excludePrefix></excludePrefix>-->
            <!-- <includeXmlPrefix></includeXmlPrefix>-->
            <!-- <excludeXmlPrefix></excludeXmlPrefix>-->
            <!-- <toCleanXmlChildElementName></toCleanXmlChildElementName>-->
            <!-- <password></password>-->
            <!-- <includeLibs></includeLibs>-->
            <!-- <alreadyProtectedRootDir></alreadyProtectedRootDir>-->
            <!-- <alreadyProtectedLibs></alreadyProtectedLibs>-->
            <!-- <supportFile></supportFile>-->
            <!-- <jvmArgCheck></jvmArgCheck>-->
            <!-- <tips></tips>-->
            <!-- <debug></debug>-->
        </configuration>
        <executions>
            <execution>
                <phase>package</phase>
                <goals>
                    <goal>class-winter</goal>
                </goals>
            </execution>
        </executions>
    </plugin>

    注:不必担心信息泄漏问题,使用此方式生成混淆的jar包时,会擦除pom.xml中关于class-winter-plugin的信息。

  • 方式二:通过 class-winter-core.jar 主动加密

    java -jar class-winter-core-2.8.9.jar originJarOrWar=${要加密的项目.jar或.war包} includePrefix=${加密范围} [k3=v3 k4=v4 ...]
    # 对于复杂的参数值,可以使用引号引起来
    # linux
    java -jar class-winter-core-2.8.9.jar k1='v1' k2='v2'
    # windows
    java -jar class-winter-core-2.8.9.jar k1="v1" k2="v2"

加密参数

提示:慎用cca(尤其)cmacfa参数,如果要用,请做好充分测试。

原因说明:部分框架在获取某些元数据时,并不全都从已被premain处理后的类中读取,而是直接去对应位置读取资源文件本身(如:spring的SimpleMetadataReader implements MetadataReader直接去读取.class文件本身,以知道是否需要将类注册进容器等),因为class-winter会对该位置的资源进行加密(如:使用cca、cma、cfa时会擦除类、方法、字段上的注解信息),因此此时如果直接去.class文件本身获取元信息的话,可能会丢失部分信息(如:被class-winter擦除了的类的注解信息就读取不到)

解决办法:可以考虑对相关逻辑进行定制,使其不从已加密的.class中获取相关信息(如:spring框架可考虑定制MetadataReader)

参数 是否必填 说明 示例
originJarOrWar 指定要加密的jar/war文件
注:当使用maven插件进行自动加密时,此参数非必填,不填则自动获取。
注:当使用maven插件进行自动加密时,可结合maven相关占位符进行相对定位。如:${project.basedir}/../../your-project.jar
originJarOrWar=/my-project.jar
includePrefix 通过前缀匹配的形式定位要加密的class,支持正则匹配
注:多个通过逗号分割。
includePrefix=com
includePrefix=com,org
includePrefix=com.*.dao,org
cca(依托于includePrefix) 作为includePrefix的附加设置,设置是否清空类上的注解(写法同url后面设置参数) includePrefix=com?cca=true
cma(依托于includePrefix) 作为includePrefix的附加设置,设置是否清空方法上的注解(写法同url后面设置参数) includePrefix=com?cca=true&cma=true
cfa(依托于includePrefix) 作为includePrefix的附加设置,设置是否清空字段上的注解(写法同url后面设置参数) includePrefix=com?cca=true&cma=true&cfa=true
caPrefix(依托于cca、cma、cfa开关) 作为includePrefix的附加设置,依托与cca、cma、cfa开关,清空类、方法、字段上的指定注解(写法同url后面设置参数)
注:多个通过|分割,注解请写完全路径例如:com.xx.anno.MyAnnotation
includePrefix=com?cca=true&cma=true&cfa=true&caPrefix=com.xx.anno.MyAnnotation|com.bb.anno.MyAnnotation
excludePrefix 通过前缀匹配的形式排除class,不对其加密,支持正则匹配
注:多个通过逗号分割。
注:excludePrefix优先级高于includePrefix。
excludePrefix=com.example.service,com.example.util.*.class
includeXmlPrefix 通过打出来的包中条目的entryName前缀匹配的形式定位要加密的xml,支持正则匹配
注:多个通过逗号分割。
注:如果您打出来的加密包是准备作为一个lib包提供给第三方使用的,那么请不要使用此参数,因为解密时是不会解密项目所依赖的lib包中的xml的。
includeXmlPrefix=BOOT-INF/classes/
includeXmlPrefix=BOOT-INF/classes/com/demo/mapper/,BOOT-INF/classes/com/*/dao/
excludeXmlPrefix 通过打出来的包中条目的entryName前缀匹配的形式排除xml,不对其加密,支持正则匹配
注:多个通过逗号分割。
excludeXmlPrefix=BOOT-INF/classes/com/demo/mapper/
excludeXmlPrefix=BOOT-INF/classes/com/demo/mapper/,BOOT-INF/classes/com/demo/*/UserDao.xml
toCleanXmlChildElementName 加密xml中的哪些一级元素
注:默认值为resultMap,sql,insert,update,delete,select
注:多个通过逗号分割。
toCleanXmlChildElementName=select,delete,resultMap
finalName 指定加密后生成的jar包名
注:若finalName与加密的包一致,那么生成的加密后的包会覆盖原来的包。
注:支持相对路径。 比如:../../tmp/my-project 就会在相对目录../../tmp下生成加密包my-project.jar。
finalName=mine-project
password 主动指定密码
注:密码不能包含空格和逗号。
password=123456
includeLibs 指定将lib包也纳入加密范围内,支持正则匹配
注:多个通过逗号分割。
注:lib中的class是否会被加密,还得由includePrefix和excludePrefix决定。
includeLibs=a.jar,b.jar,c-.*.jar
alreadyProtectedRootDir 指明已加密lib包所在根目录(,可为空,为空时自动根据当前是jar还是war,去包内对应找lib)
注:当指定此参数时,也会优先去jar/war内部找对应的lib包,找不到时,才会去此参数指定的根目录下找lib包。
注:在一些外置lib的项目中,可能需要用到此参数;如果是内置lib,忽略此参数即可。
注:此参数由2.7.0版本开始支持
alreadyProtectedRootDir=/lib
alreadyProtectedLibs 指明项目所依赖的lib中,哪些lib本身就已经是被class-winter加密了的
注:多个通过逗号分割。
注:主要用于处理第三方提供的由class-winter加密了的依赖包的场景。
注:若lib需要密码,那么需要在指定lib的同时通过冒号接上密码。
注:如果lib有密码,那么密码不能包含逗号。
alreadyProtectedLibs=a.jar,b-1.0.0.jar
alreadyProtectedLibs=a.jar,b-1.0.0.jar:pwd123
alreadyProtectedLibs=a.jar:pwd1,b-1.0.0.jar:pwd2
supportFile 指定一个加密辅助jar文件(或jar文件所在的目录)
注:当为目录时,该目录(含子孙目录)下的所有jar都会被采集作为辅助文件。
注:主要用于解决因ClassNotFound导致的加密失败问题。
supportFile=/abc.jar
supportFile=/libs
jvmArgCheck 设置当启动混淆包时,必须要有的jvm参数
注:多个通过逗号分割。
注:大小写不敏感。
如:通过设置-XX:+DisableAttachMechanism防止运行时dump class,以提高安全性。
jvmArgCheck=-XX:+DisableAttachMechanism,-Xms2048M
tips 指定提示语。
注:当直接使用加密后的jar/war时,用到了加密了的类后,会先System.err.println输出此tips,然后System.exit退出程序。
windows示例:tips="请不要直接使用混淆后的jar/war"
linux示例:tips='请不要直接使用混淆后的jar/war'
debug 是否开启debug模式 debug=true

解密(启动)

class-winter支持JVM参数校验,通过在JVM参数中加入-XX:+DisableAttachMechanism来防止其他工具连接到你的Java程序。这样可以阻止运行至dump class。

但是有些高级开发者可能会想要使用sa-jdiHSDBdump 字节码。从2.8.8版本开始,支持在启动Java解密时禁用了gHotSpotVMStructs函数,避免使用sa-jdi HSDB 来dump class,提高代码安全性。

  • jar解密(启动)

    # 假设your-project-encrypted.jar是由class-winter加密后的包,那么你可以这么启动
    java -javaagent:/your-project-encrypted.jar -jar /your-project-encrypted.jar
    # 也可以用class-winter-core-2.8.9.jar
    # java -javaagent:/class-winter-core-2.8.9.jar -jar /your-project-encrypted.jar
    # 或者指定参数
    # java -javaagent:/your-project-encrypted.jar=debug=true,password=pwd12345 -jar /your-project-encrypted.jar
    # 参数可以引起来(linux)
    # java -javaagent:/your-project-encrypted.jar='debug=true,password=pwd12345' -jar /your-project-encrypted.jar
    # 参数可以引起来(windows)
    # java -javaagent:/your-project-encrypted.jar="debug=true,password=pwd12345" -jar /your-project-encrypted.jar
  • war解密(启动)

    以Tomcat9为例

    • linux方式一

      编辑tomcat/bin/catalina.sh文件,在最上面加上

      # 如果你有参数, 那么 -javaagent:/class-winter-core-2.8.9.jar=k1=v1,k2=v2
      # tomcat启动往往需要通过decryptProjectPathPrefix指定要解密的路径
      CATALINA_OPTS="$CATALINA_OPTS -javaagent:/class-winter-core-2.8.9.jar=debug=true,decryptProjectPathPrefix=/usr/local/xxx/";
      export CATALINA_OPTS;
    • linux方式二

      在tomcat/bin目录下创建setenv.sh文件,并写上

      # 如果你有参数, 那么 -javaagent:/class-winter-core-2.8.9.jar=k1=v1,k2=v2
      # tomcat启动往往需要通过decryptProjectPathPrefix指定要解密的路径
      JAVA_OPTS="$JAVA_OPTS -javaagent:/class-winter-core-2.8.9.jar=debug=true,decryptProjectPathPrefix=/usr/local/xxx/";
      export JAVA_OPTS;
    • windows方式一

      编辑tomcat/bin/catalina.bat文件,在@echo off后加上catalina参数

      rem 如果你有参数, 那么 -javaagent:D:/class-winter-core-2.8.9.jar=k1=v1,k2=v2
      rem tomcat启动往往需要通过decryptProjectPathPrefix指定要解密的路径
      set CATALINA_OPTS="-javaagent:D:/class-winter-core-2.8.9.jar=decryptProjectPathPrefix=/D:/tmp/"
    • windows方式二

      在tomcat/bin目录下创建setenv.bat文件,并写上

      rem 如果你有参数, 那么 -javaagent:D:/class-winter-core-2.8.9.jar=k1=v1,k2=v2
      rem tomcat启动往往需要通过decryptProjectPathPrefix指定要解密的路径
      set JAVA_OPTS="-javaagent:D:/class-winter-core-2.8.9.jar=decryptProjectPathPrefix=/D:/tmp/"
  • IDE解密(启动)

    设置-javaagent参数指定class-winter-core或者任一加密包。有必要的话,再搭配skipProjectPathPrefix或者decryptProjectPathPrefix参数启动即可

    示例说明

解密参数

参数 是否必填 说明 示例
password 指定解密密码 password=pwd123
passwordFromFile 从指定文件中读取文本作为解密密码
注:此参数由2.4.0版本开始支持
passwordFromFile=/my-pwd-file.txt
passwordFromShell 执行shell文件中的代码,并以其返回值作为解密密码
注:此参数由2.4.0版本开始支持
passwordFromShell=/my-pwd-file.shell
skipProjectPathPrefix 是否跳过指定前缀的项目路径(当class-winter解密逻辑试图解析那些进入premain但是非class-winter加密项目时,会因为获取印章失败Obtain project seal fail而停止,此时如果确认这个项目没有加密文件的话,可以使用此参数跳过)
注:值中的路径分隔符请统一使用/
注:不知道此值怎么填的,可以把debug代开, 观察日志 Exist projectPath -> xxx,从输出的所有projectPath中找到加密包的路径
注:此参数由2.6.4版本开始支持
skipProjectPathPrefix=/D:/apache-tomcat-9.0.71/bin/
多个通过___符号拼接:skipProjectPathPrefix=/D:/apache-tomcat-9.0.71/bin/___/D:/jd/classpath/lib/
decryptProjectPathPrefix 是否仅解密指定前缀的项目路径(优先级低于skipProjectPathPrefix)
注:值中的路径分隔符请统一使用/
注:不知道此值怎么填的,可以把debug代开, 观察日志 Exist projectPath -> xxx,从输出的所有projectPath中找到加密包的路径
注:此参数由2.6.6版本开始支持
decryptProjectPathPrefix=/D:/apache-tomcat-9.0.71/bin/
多个通过___符号拼接:decryptProjectPathPrefix=/D:/apache-tomcat-9.0.71/bin/___/D:/jd/classpath/lib/
debug 是否开启debug模式 debug=true

对class-winter本身进行加密

感谢小伙伴Mango对class-winter的优质反馈

  • 背景说明:我们利用class-winter混淆项目时,项目是被混淆了,但是class-winter本身还是明文的,这就留下了一些安全隐患(即:那些不指定密码的混淆,可能会被反向破解)
  • 增强支持:我们可以对class-winter本身进行加密,你可以切换至enhance-*分支,在首页下载被混淆的class-winter进行测试,或者clone代码,install后进行测试
  • 声明:因为在enhance-*分支里对class-winter本身进行加密时用到了收费工具allatori(实际上有供学习使用的破解版之类的),所以enhance-*分支的代码,本人并未发布至maven官方仓库

将已加密的包提供给客户使用

方案

  • 方案一(适用于encrypted-A依赖于encrypted-B.jar,启动encrypted-A的情况)

    提示:此方式也适用于不加密A的情况,在A里的class-winter配置你只需要指定一个不存在的includePrefix即可

    class-winter加密时,使用alreadyProtectedLibs参数,但是要求客户的项目也需要使用class-winter加密(,哪怕客户的项目什么也不需要加密,也要求客户有使用class-winter这个动作)

  • 方案二(适用于A依赖于encrypted-B.jar,启动A的情况)

    利用-Dloader.path或其它方案,将encrypted-B.jar外置,并通过decryptProjectPathPrefixskipProjectPathPrefix来定位encrypted-B.jar

示例

提示:这里以可执行的jar进行的示例,其余的外置方式也是可以的(如:tomcat部署war包解压后,lib包就相当于是外置的)

-Dloader.path实现,将encrypted-B.jar外置到项目包A外

  • 假设客户依赖了我们的加密包

    客户项目

  • 客户使用maven插件,打包时将项目代码和依赖的lib分开

    完整pom示例:

    <?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>2.8.9</version>
            <relativePath/> <!-- lookup parent from repository -->
        </parent>
        <groupId>com.example</groupId>
        <artifactId>demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>demo</name>
        <description>Demo project for Spring Boot</description>
        <properties>
            <java.version>1.8</java.version>
        </properties>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </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>com.demo</groupId>
                <artifactId>encrypted-lib-no-pwd</artifactId>
                <scope>system</scope>
                <version>1.0.0</version>
                <systemPath>${pom.basedir}/src/main/resources/lib/encrypted-lib-no-pwd-1.0.0.jar</systemPath>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <configuration>
                        <!-- 指定该Main Class为全局的唯一入口 -->
                        <mainClass>com.ideaaedi.demo.DemoApplication</mainClass>
                        <!-- 把systemPath指定的jar包也纳入lib -->
                        <includeSystemScope>true</includeSystemScope>
                        <fork>true</fork>
                        <!-- 设置为ZIP,此模式下spring-boot-maven-plugin会将MANIFEST.MF文件中的Main-Class设置为org.springframework.boot.loader.PropertiesLauncher -->
                        <layout>ZIP</layout>
                        <includes>
                            <include>
                                <groupId>nothing</groupId>
                                <artifactId>nothing</artifactId>
                            </include>
                        </includes>
                    </configuration>
                    <executions>
                        <execution>
                            <goals>
                                <goal>repackage</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>
    
                <!-- 通过插件将所有依赖的lib包放到编译后的target/lib目录,并且在打包时候排除内部依赖 -->
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-dependency-plugin</artifactId>
                    <version>3.2.0</version>
                    <executions>
                        <execution>
                            <id>copy-dependencies</id>
                            <phase>prepare-package</phase>
                            <goals>
                                <goal>copy-dependencies</goal>
                            </goals>
                            <configuration>
                                <outputDirectory>${project.build.directory}/lib</outputDirectory>
                                <overWriteReleases>false</overWriteReleases>
                                <overWriteSnapshots>false</overWriteSnapshots>
                                <overWriteIfNewer>true</overWriteIfNewer>
                                <includeScope>compile</includeScope>
                            </configuration>
                        </execution>
                    </executions>
                </plugin>
            </plugins>
        </build>
    
    </project>

    打出来的包:

    打出来的包

  • 客户可以这样启动项目

    java -Dloader.path=./lib/ -javaagent:./{class-winter.jar} -jar {客户项目.jar}

    使用loader.path引入依赖

功能扩展案例

感谢以下小伙伴们的优秀扩展案例

序号 扩展功能 作者 仓库地址
1 机器码支持 qq号:85546017

当前(2023-06-11)状态:
 qq名:╮(╯_╰)╭
 是否在class-winter QQ群:是
点击跳转
...... ...... ...... ......

FAQ

class-winter初始能力设计理念是,只做通用能力支持,如果没法做到通用,那就干脆不做,需要的话使用者自行扩展

  • 1. 是否支持yml等配置文件加密?

    不支持。

    不同的框架加载配置文件的方式不一样,没法写一个通用的加密逻辑,需要的话自行根据所用技术框架自行实现

  • 2. 是否支持对lib包里的xml加密?

    不支持。

    首先实现起来相对麻烦,其次即便是(通用)加密也是伪加密。除非自己根据框架进行扩展进行定制加密

  • 3. 部分版本spring-boot为啥加密后,启动时读取配置文件内容失败?

    配置文件使用.yaml或.properties无此问题;部分版本的spring-boot使用.yml配置文件可能出现部分配置读取失败。

  • 4. 启动时明明按要求指定了JVM参数,为啥还是提示Miss jvm arg?

    JVM参数位置不对,要放在-jar xxx.jar之前

    # 错误案例
    java -javaagent:cc-encrypted.jar -jar cc-encrypted.jar -XX:+DisableAttachMechanism
    # 正确案例
    java -javaagent:cc-encrypted.jar -XX:+DisableAttachMechanism -jar cc-encrypted.jar 
  • 5. class-winter是否支持对类名、字段名、方法名等进行混淆?

    不支持。

    需要的话,可结合其它混淆工具(如:allatori等)一起加密,可参考enhance分支

  • 6. includeLibs指定了要加密的lib包,为啥没生效?

    首先检查是否正确配置了includeLibs,然后检查includePrefix匹配范围是否包含lib中的class

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简介

jar/war代码加密混淆,基于javaagent 展开 收起
Java
Apache-2.0
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