{"id":1090,"date":"2025-04-20T05:05:57","date_gmt":"2025-04-20T05:05:57","guid":{"rendered":"http:\/\/www.nokws.top\/?p=1090"},"modified":"2025-04-20T05:05:58","modified_gmt":"2025-04-20T05:05:58","slug":"javazijiemaduibi-asmhejavaassistdaimashixian","status":"publish","type":"post","link":"http:\/\/www.nokws.top\/index.php\/2025\/04\/20\/javazijiemaduibi-asmhejavaassistdaimashixian\/","title":{"rendered":"Java\u5b57\u8282\u7801\u5bf9\u6bd4 ASM\u548cJavaassist\u2014\u2014\u4ee3\u7801\u5b9e\u73b0"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">0x01 \u4ee3\u7801\u5b9e\u73b0<\/h2>\n\n\n\n<p>\u521b\u5efa\u4e00\u4e2aHello\u7c7b\uff0c\u6253\u5370\u201chello\u201d<br>\u2014\u2014\u5728BytecodeModifierASM\u7c7b\u4e2d\uff0c\u6dfb\u52a0<code>System.<em>out<\/em>.println(\"Modified By ASM.\");<\/code><br>\u2014\u2014\u5728BytecodeModifierJavassist\u7c7b\u4e2d\uff0c\u6dfb\u52a0<code>System.out.println(\"Modified By JavaAssist!\");<\/code><\/p>\n\n\n\n<p><strong>BytecodeModificationLauncher\u7c7b<\/strong><br>\u8c03\u7528BytecodeModifierASM\u548cBytecodeModifierJavassist<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import java.io.File;\nimport java.io.FileInputStream;\nimport java.io.IOException;\nimport java.lang.reflect.Method;\nimport java.util.HashMap;\nimport java.util.Map;\n\nclass CustomClassLoader extends ClassLoader {\n    private Map&lt;String, Class&lt;?>> loadedClasses = new HashMap&lt;>();\n\n    public CustomClassLoader() {\n        super(CustomClassLoader.class.getClassLoader());\n    }\n\n    public Class&lt;?> defineClassFromFile(String className, String filePath) throws IOException {\n        if (loadedClasses.containsKey(className)) {\n            return loadedClasses.get(className);\n        }\n\n        File file = new File(filePath);\n        byte[] b = new byte[(int) file.length()];\n        FileInputStream fis = new FileInputStream(file);\n        fis.read(b);\n        fis.close();\n\n        Class&lt;?> clazz = defineClass(className, b, 0, b.length);\n        loadedClasses.put(className, clazz);\n        return clazz;\n    }\n}\n\npublic class BytecodeModificationLauncher {\n    public static void main(String[] args) {\n        \/\/ \u6b63\u5e38\u8c03\u7528 Hello \u7c7b\n        System.out.println(\"\u6b63\u5e38\u8c03\u7528Hello\u7c7b:\");\n        Hello.main(args);\n\n        try {\n            \/\/ \u8c03\u7528 ASM \u65b9\u5f0f\u4fee\u6539\u5b57\u8282\u7801\n            System.out.println(\"\\nASM\u5b57\u8282\u7801\u4fee\u6539\");\n            BytecodeModifierASM.main(args);\n\n            System.out.println(\"\u5b57\u8282\u7801\u4fee\u6539\u540e\u8c03\u7528:\");\n\n            \/\/ \u4f7f\u7528\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\u4fee\u6539\u540e\u7684\u7c7b\n            CustomClassLoader classLoader1 = new CustomClassLoader();\n            Class&lt;?> modifiedHelloClass1 = classLoader1.defineClassFromFile(\"Hello\", \"out\/test\/test\/Hello.class\");\n            Method mainMethod = modifiedHelloClass1.getMethod(\"main\", String[].class);\n            mainMethod.invoke(null, (Object) args);\n\n\n            System.out.println(\"=====\");\n        } catch (Exception e) {\n            System.err.println(\"An error occurred during bytecode modification: \" + e.getMessage());\n            e.printStackTrace();\n        }\n\n        try {\n            System.out.println(\"\u6b63\u5e38\u8c03\u7528Hello\u7c7b:\");\n            Hello.main(args);\n            \/\/ \u8c03\u7528 JavaAssist \u65b9\u5f0f\u4fee\u6539\u5b57\u8282\u7801\n\n            \n            System.out.println(\"\\nJavaAssist\u5b57\u8282\u7801\u4fee\u6539\");\n            BytecodeModifierJavassist.main(args);\n            System.out.println(\"\u5b57\u8282\u7801\u4fee\u6539\u540e\u8c03\u7528\uff08\u91cd\u65b0\u52a0\u8f7d\u7c7b\uff09:\");\n\n            \/\/ \u518d\u6b21\u4f7f\u7528\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\u4fee\u6539\u540e\u7684\u7c7b\n            CustomClassLoader classLoader2 = new CustomClassLoader();\n            Class&lt;?> modifiedHelloClass2 = classLoader2.defineClassFromFile(\"Hello\", \"out\/test\/test\/Hello.class\");\n            Method mainMethod = modifiedHelloClass2.getMethod(\"main\", String[].class);\n            mainMethod.invoke(null, (Object) args);\n\n            System.out.println(\"=====\");\n        } catch (Exception e) {\n            System.err.println(\"An error occurred during bytecode modification: \" + e.getMessage());\n            e.printStackTrace();\n        }\n    }\n}<\/pre>\n\n\n\n<p><strong>BytecodeModifierASM\u7c7b<\/strong><br>\u901a\u8fc7ASM\u5b9e\u73b0\u5b57\u8282\u7801\u4fee\u6539<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import org.objectweb.asm.*;\nimport java.io.FileOutputStream;\nimport java.io.IOException;\n\npublic class BytecodeModifierASM {\n    public static void main(String[] args) throws IOException {\n        ClassReader cr = new ClassReader(\"Hello\");\n        ClassWriter cw = new ClassWriter(cr, ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);\n        ClassVisitor cv = new HelloClassVisitor(Opcodes.ASM9, cw);\n        cr.accept(cv, ClassReader.EXPAND_FRAMES);\n        byte[] modifiedClassBytes = cw.toByteArray();\n\n        try (FileOutputStream fos = new FileOutputStream(\"out\/test\/test\/Hello.class\")) {\n            fos.write(modifiedClassBytes);\n        }\n    }\n}\n\nclass HelloClassVisitor extends ClassVisitor {\n    public HelloClassVisitor(int api, ClassVisitor classVisitor) {\n        super(api, classVisitor);\n    }\n\n    @Override\n    public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {\n        MethodVisitor mv = super.visitMethod(access, name, descriptor, signature, exceptions);\n        if (\"main\".equals(name)) {\n            return new HelloMethodVisitor(api, mv);\n        }\n        return mv;\n    }\n}\n\nclass HelloMethodVisitor extends MethodVisitor {\n    public HelloMethodVisitor(int api, MethodVisitor methodVisitor) {\n        super(api, methodVisitor);\n    }\n\n    @Override\n    public void visitMethodInsn(int opcode, String owner, String name, String descriptor, boolean isInterface) {\n\n        System.out.println(\"Found call to OutTest.printMessage, modifying bytecode...\");\n        \/\/ \u52a0\u8f7d System.out\n        super.visitFieldInsn(Opcodes.GETSTATIC, \"java\/lang\/System\", \"out\", \"Ljava\/io\/PrintStream;\");\n        \/\/ \u52a0\u8f7d\u5b57\u7b26\u4e32 \"Modified\"\n        super.visitLdcInsn(\"Modified By ASM.\");\n        \/\/ \u8c03\u7528 PrintStream.println \u65b9\u6cd5\n        super.visitMethodInsn(Opcodes.INVOKEVIRTUAL, \"java\/io\/PrintStream\", \"println\", \"(Ljava\/lang\/String;)V\", false);\n\n    }\n}<\/pre>\n\n\n\n<p><strong>BytecodeModifierJavassist\u7c7b<\/strong><br>\u901a\u8fc7Javaassist\u5b9e\u73b0\u5b57\u8282\u7801\u4fee\u6539<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import javassist.*;\n\nimport java.io.IOException;\n\npublic class BytecodeModifierJavassist {\n    public static void main(String[] args) {\n        try {\n            ClassPool pool = ClassPool.getDefault();\n            \/\/ \u624b\u52a8\u6dfb\u52a0\u7c7b\u8def\u5f84\n            pool.appendClassPath(\"\/out\/test\/test\/\");\n            \/\/ \u4f7f\u7528\u6b63\u786e\u7684\u7c7b\u540d\n\n            \/\/ \u83b7\u53d6 Hello \u7c7b\u7684 CtClass \u5bf9\u8c61\n            CtClass cc = pool.get(\"Hello\");\n            if (cc.isFrozen()) {\n                cc.defrost();\n            }\n            CtMethod mainMethod = cc.getDeclaredMethod(\"main\");\n            mainMethod.insertBefore(\"System.out.println(\\\"Modified By JavaAssist!\\\");\");\n            \/\/ \u5199\u5165\u4fee\u6539\u540e\u7684\u5b57\u8282\u7801\u5230\u6587\u4ef6\n            cc.writeFile(\"out\/test\/test\/\");\n        } catch (NotFoundException | CannotCompileException | IOException e) {\n            e.printStackTrace();\n        }\n    }\n}<\/pre>\n\n\n\n<p>Hello\u7c7b<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class Hello {\n    public static void main(String[] args) {\n        System.out.println(\"Hello.\");\n    }\n}<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">0x02 \u5bf9\u6bd4<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>JavaAssist<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528\u00a0<code>ClassPool<\/code>\u00a0\u6765\u7ba1\u7406\u7c7b\u7684\u5b57\u8282\u7801\uff0c\u901a\u8fc7\u00a0<code>pool.appendClassPath<\/code>\u00a0\u65b9\u6cd5\u624b\u52a8\u6dfb\u52a0\u7c7b\u8def\u5f84\u3002<\/li>\n\n\n\n<li>\u901a\u8fc7\u00a0<code>pool.get(\"Hello\")<\/code>\u00a0\u65b9\u6cd5\u83b7\u53d6\u00a0<code>Hello<\/code>\u00a0\u7c7b\u7684\u00a0<code>CtClass<\/code>\u00a0\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u662f JavaAssist \u4e2d\u8868\u793a\u7c7b\u7684\u6838\u5fc3\u7c7b\u3002<\/li>\n\n\n\n<li>\u901a\u8fc7\u00a0<code>CtClass<\/code>\u00a0\u5bf9\u8c61\u83b7\u53d6\u76ee\u6807\u65b9\u6cd5\u00a0<code>CtMethod<\/code>\uff0c\u7136\u540e\u4f7f\u7528\u00a0<code>insertBefore<\/code>\u00a0\u65b9\u6cd5\u5728\u65b9\u6cd5\u5f00\u59cb\u5904\u63d2\u5165\u4ee3\u7801\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528\u00a0<code>CtClass<\/code>\u00a0\u5bf9\u8c61\u7684\u00a0<code>writeFile<\/code>\u00a0\u65b9\u6cd5\u5c06\u4fee\u6539\u540e\u7684\u5b57\u8282\u7801\u5199\u5165\u6587\u4ef6\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>ASM<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528\u00a0<code>ClassReader<\/code>\u00a0\u6765\u8bfb\u53d6\u76ee\u6807\u7c7b\u7684\u5b57\u8282\u7801\uff0c\u901a\u8fc7\u00a0<code>new ClassReader(\"Hello\")<\/code>\u00a0\u76f4\u63a5\u8bfb\u53d6\u00a0<code>Hello<\/code>\u00a0\u7c7b\u7684\u5b57\u8282\u7801\u3002<\/li>\n\n\n\n<li>\u6ca1\u6709\u663e\u5f0f\u7684\u7c7b\u8def\u5f84\u7ba1\u7406\uff0c\u4f9d\u8d56\u4e8e Java \u7c7b\u52a0\u8f7d\u673a\u5236\u548c\u5b57\u8282\u7801\u6587\u4ef6\u7684\u4f4d\u7f6e\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528\u00a0<code>ClassVisitor<\/code>\u00a0\u548c\u00a0<code>MethodVisitor<\/code>\u00a0\u6765\u904d\u5386\u548c\u4fee\u6539\u5b57\u8282\u7801\u3002\u901a\u8fc7\u91cd\u5199\u00a0<code>visitMethod<\/code>\u00a0\u548c\u00a0<code>visitMethodInsn<\/code>\u00a0\u7b49\u65b9\u6cd5\uff0c\u5728\u7279\u5b9a\u7684\u65b9\u6cd5\u8c03\u7528\u5904\u63d2\u5165\u5b57\u8282\u7801\u6307\u4ee4\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528\u00a0<code>ClassWriter<\/code>\u00a0\u751f\u6210\u4fee\u6539\u540e\u7684\u5b57\u8282\u7801\uff0c\u901a\u8fc7\u00a0<code>cw.toByteArray()<\/code>\u00a0\u65b9\u6cd5\u83b7\u53d6\u5b57\u8282\u7801\u6570\u7ec4\uff0c\u7136\u540e\u4f7f\u7528\u00a0<code>FileOutputStream<\/code>\u00a0\u5c06\u5b57\u8282\u7801\u6570\u7ec4\u5199\u5165\u6587\u4ef6\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">0x03 \u7ed3\u679c\u5206\u6790<\/h2>\n\n\n\n<p>\u6ce8\u91ca<code>BytecodeModifierJavassist.main(args);<\/code>\u548c<code>BytecodeModifierASM.main(args);<\/code>\u7684Hello.class\u6587\u4ef6<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/www.nokws.top\/wp-content\/uploads\/2025\/04\/image.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"815\" height=\"373\" data-original=\"http:\/\/www.nokws.top\/wp-content\/uploads\/2025\/04\/image.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1091\"  sizes=\"auto, (max-width: 815px) 100vw, 815px\" \/><\/div><\/figure>\n\n\n\n<p>\u5e26\u6709<code>BytecodeModifierJavassist.main(args)<\/code>;\u548c<code>BytecodeModifierASM.main(args);<\/code>\u7684Hello.class\u6587\u4ef6<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/www.nokws.top\/wp-content\/uploads\/2025\/04\/image-1.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"954\" height=\"534\" data-original=\"http:\/\/www.nokws.top\/wp-content\/uploads\/2025\/04\/image-1.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1092\"  sizes=\"auto, (max-width: 954px) 100vw, 954px\" \/><\/div><\/figure>\n\n\n\n<p><code>System.<em>out<\/em>.println(\"Modified By JavaAssist!\");<\/code> \u662fJavaassist\u65b9\u6cd5\u6dfb\u52a0\u7684\u5185\u5bb9\uff1b<br><code>PrintStream var10000 = System.<em>out<\/em>;<br>String var10001 = \"Hello.\";<br>System.<em>out<\/em>.println(\"Modified By ASM.\"); <\/code> \u662fASM\u65b9\u6cd5\u6dfb\u52a0\u7684\u5185\u5bb9\u3002<\/p>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230ASM\u65b9\u6cd5\u751f\u6210\u4e862\u4e2a\u53d8\u91cf\uff08\u5c40\u90e8\u53d8\u91cf\u8868\u7684\u547d\u540d\u65b9\u5f0f\uff09\u5b58\u50a8\u4e86\u539f\u672c\u7684\u5185\u5bb9<br>ASM\u7684\u64cd\u4f5c\u66f4\u7ec6\uff0cJavaassist\u64cd\u4f5c\u7b80\u5355\u76f4\u89c2\uff0c\u5bf9\u5e94\u5230Rasp\u573a\u666f\uff0c\u5e94\u8be5\u662f\u66f4\u9002\u5408\u7528javaassit\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>0x04 \u540e\u7eed<\/strong><\/h2>\n\n\n\n<p>1\u3001OpenRasp\u7684\u5b9e\u73b0\uff0c\u68c0\u6d4b\u7684\u65f6\u5019\u5982\u4f55\u5efa\u7acb\u68c0\u6d4b\u6c60\uff1b<br>\u9ed1\u540d\u5355\uff1f<br>2\u3001\u4e24\u79cd\u65b9\u6cd5\u5747\u4f1a\u4fee\u6539\u5177\u4f53\u7684class\u6587\u4ef6\uff0c\u4e0d\u4fee\u6539class\u6587\u4ef6\u7684\u62e6\u622a\u5b9e\u73b0<br>\u7b3c\u7edf\u7684\u8bb2\u5c31\u662f\u68c0\u6d4b\u5230\u9ad8\u5371\u7c7b\u7684\u52a0\u8f7d\uff0c\u5728\u7c7b\u52a0\u8f7d\u9636\u6bb5\u62e6\u622a<br><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>0x01 \u4ee3\u7801\u5b9e\u73b0 \u521b\u5efa\u4e00\u4e2aHello\u7c7b\uff0c\u6253\u5370\u201chello\u201d\u2014\u2014\u5728BytecodeModifierASM\u7c7b\u4e2d\uff0c [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1090","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"http:\/\/www.nokws.top\/index.php\/wp-json\/wp\/v2\/posts\/1090","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.nokws.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.nokws.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.nokws.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.nokws.top\/index.php\/wp-json\/wp\/v2\/comments?post=1090"}],"version-history":[{"count":1,"href":"http:\/\/www.nokws.top\/index.php\/wp-json\/wp\/v2\/posts\/1090\/revisions"}],"predecessor-version":[{"id":1093,"href":"http:\/\/www.nokws.top\/index.php\/wp-json\/wp\/v2\/posts\/1090\/revisions\/1093"}],"wp:attachment":[{"href":"http:\/\/www.nokws.top\/index.php\/wp-json\/wp\/v2\/media?parent=1090"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.nokws.top\/index.php\/wp-json\/wp\/v2\/categories?post=1090"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.nokws.top\/index.php\/wp-json\/wp\/v2\/tags?post=1090"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}