{"id":1023,"date":"2024-10-27T08:53:47","date_gmt":"2024-10-27T08:53:47","guid":{"rendered":"http:\/\/www.nokws.top\/?p=1023"},"modified":"2024-11-17T03:52:13","modified_gmt":"2024-11-17T03:52:13","slug":"javassistxuexiyi","status":"publish","type":"post","link":"http:\/\/www.nokws.top\/index.php\/2024\/10\/27\/javassistxuexiyi\/","title":{"rendered":"Javassist\u5b66\u4e60\uff08\u4e00\uff09"},"content":{"rendered":"\n

\u672a\u5b8c\u5f85\u7eed\u3002\u3002\u3002<\/p>\n\n\n\n

0x01 Javassist\u662f\u4ec0\u4e48<\/h2>\n\n\n\n

\u4e00\u4e2a\u7528\u4e8e\u52a8\u6001\u4fee\u6539\u5b57\u8282\u7801\u7684\u5e93\uff0c\u4e3b\u8981\u5b9e\u73b0\u4e86\u4fee\u6539\u7c7b\u3001\u5b9a\u4e49\u65b0\u7c7b\u3001\u4ee3\u7801\u63d2\u6869\u548c\u4ee3\u7406\u3002<\/p>\n\n\n\n

0x02 Javassist\u6709\u4ec0\u4e48<\/h2>\n\n\n\n

\u4e3b\u8981\u5173\u6ce8ClassPool\u548cCtClass\u3002<\/p>\n\n\n\n

ClassPool<\/strong>\uff1a\u5bb9\u5668\u7c7b\uff0c\u7ba1\u7406\u6240\u6709\u7c7b\u7684\u5b9a\u4e49\u3002\u7528\u4e8e\u67e5\u627e\u3001\u88c5\u8f7d\u548c\u7f13\u5b58\u7c7b
getDefault() \u83b7\u53d6\u9ed8\u8ba4\u7684 ClassPool \u5b9e\u4f8b\u3002
get(String className)\u6839\u636e\u7c7b\u540d\u83b7\u53d6 CtClass \u5b9e\u4f8b\u3002\u5982\u679c\u7c7b\u5df2\u52a0\u8f7d\uff0c\u5b83\u5c06\u8fd4\u56de\u73b0\u6709\u7684 CtClass\uff1b\u5982\u679c\u672a\u52a0\u8f7d\uff0c\u5219\u4f1a\u5c1d\u8bd5\u52a0\u8f7d\u8be5\u7c7b\u3002
makeClass(String className)\u521b\u5efa\u65b0\u7684 CtClass\u3002
getCtClass(String className)\u83b7\u53d6\u6307\u5b9a\u7c7b\u7684 CtClass \u5b9e\u4f8b\u3002\u5982\u679c\u8be5\u7c7b\u5df2\u7ecf\u88ab\u52a0\u8f7d\uff0c\u8fd4\u56de\u5176 CtClass\uff1b\u5426\u5219\u629b\u51fa NotFoundException\u3002
toClass(CtClass ctClass)\u5c06 CtClass \u8f6c\u6362\u4e3a\u76f8\u5e94\u7684 Java \u7c7b\uff0c\u5e76\u52a0\u8f7d\u5230 JVM \u4e2d\u3002\u7528\u4e8e\u5c06\u52a8\u6001\u751f\u6210\u6216\u4fee\u6539\u7684\u7c7b\u8f7d\u5165\u5230\u5185\u5b58\u4e2d\u3002<\/p>\n\n\n\n

CtClass<\/strong>\uff1a”compile-time” \u7684\u7f29\u5199\u3002\u8fd9\u4e2a\u7c7b\u63d0\u4f9b\u4e86\u6dfb\u52a0\u5b57\u6bb5\u3001\u65b9\u6cd5\u3001\u6784\u9020\u51fd\u6570\u7b49\u7684\u63a5\u53e3
getName()\uff1a\u83b7\u53d6\u7c7b\u7684\u5168\u9650\u5b9a\u540d\u79f0\u3002
addField(CtField field)\uff1a\u5411\u7c7b\u4e2d\u6dfb\u52a0\u65b0\u5b57\u6bb5\u3002
toClass()\uff1a\u5c06 CtClass \u8f6c\u6362\u4e3a Class \u5e76\u52a0\u8f7d\u5230 JVM\u3002<\/p>\n\n\n\n

0x03 \u600e\u4e48\u7528\u4e8e\u68c0\u6d4b<\/h2>\n\n\n\n

\u4ece\u4e0a\u9762\u7684\u65b9\u6cd5\uff0c\u601d\u8003\uff0c\u662f\u4e0d\u662f\u901a\u8fc7ClassPool\u52a0\u8f7d\u9700\u8981\u68c0\u6d4b\u7684\u7c7b\uff0c\u518d\u901a\u8fc7CtClass\uff0c\u83b7\u53d6\u5168\u540d\u5c31\u53ef\u4ee5\u8fdb\u884c\u767d\u540d\u5355\u7684\u6821\u9a8c\uff0c\u63a5\u7740\u5728\u68c0\u6d4b\u7684\u7c7b\u4e2d\u6dfb\u52a0\u65b0\u7684\u5b57\u6bb5\uff0c\u6700\u540e\u5c06\u4fee\u6539\u540e\u7684Class\u7c7b\u52a0\u8f7d\u5230JVM\u4e2d\u3002\u5c31\u80fd\u5b8c\u6210\u6574\u4e2a\u7684\u68c0\u6d4b\u3002<\/p>\n\n\n\n

\u611f\u89c9\u4e0a\u8fd9\u4e2a\u65b9\u6cd5\u548c\u4e4b\u524d\u4f7f\u7528Rasp\u3001\u8bfbRasp\u6e90\u7801\u662f\u80fd\u591f\u5bf9\u5e94\u7684\u3002
1\u3001\u4f7f\u7528Rasp\u65f6\uff0c\u53cd\u5e8f\u5217\u5316\u6f0f\u6d1e\u7684\u5b8c\u6574\u8c03\u7528\u94fe\u662f\u80fd\u591f\u53cd\u9988\u7ed9\u7528\u6237\u7684\uff1b
2\u3001\u8bfbRasp\u7684\u65f6\u5019\u786e\u5b9a\uff0c\u53cd\u5e8f\u5217\u5316\u6f0f\u6d1e\u68c0\u6d4b\u65f6\uff0c\u5229\u7528\u4e86\u767d\u540d\u5355\u3002<\/p>\n\n\n\n

0x04 Javassist \u8bd5\u7528<\/h2>\n\n\n\n

1\u3001\u751f\u6210\u4e00\u4e2a\u65b0\u7c7b<\/p>\n\n\n\n

import javassist.*;\n\npublic class JavassistTest {\n    public static void main(String[] args) throws Exception {\n        ClassPool pool = ClassPool.getDefault();\n        CtClass ctClass = pool.makeClass(\"HelloWorld\");\n\n        CtMethod method = CtNewMethod.make(\"public void Hello() { System.out.println(\\\"Hello, World!\\\"); }\", ctClass);\n        ctClass.addMethod(method);\n\n        Class<?> clazz = ctClass.toClass();\n        Object instance = clazz.getDeclaredConstructor().newInstance();\n        clazz.getMethod(\"Hello\").invoke(instance);\n    }\n}\n<\/pre>\n\n\n\n
2\u3001webshell\u514d\u6740\uff08\u672a\u5b8c\u6210\uff09<\/p>\n\n\n\n
Java\u5b89\u5168\u4e4bJavassist\u52a8\u6001\u7f16\u7a0b – nice_0e3 – \u535a\u5ba2\u56ed<\/a><\/p>\n\n\n\n
3\u3001\u68c0\u6d4b.class\u6587\u4ef6\uff08\u672a\u5b8c\u6210\uff09<\/p>\n\n\n\n
javassist\u4f7f\u7528\u5168\u89e3\u6790 – rickiyang – \u535a\u5ba2\u56ed<\/a><\/p>\n\n\n\n
0x05 \u53c2\u8003<\/h2>\n\n\n\n
Java\u4e2d\u7684\u9ad8\u6027\u80fd\u5b57\u8282\u7801\u5de5\u5177\uff1aJavassist_java\u5b57\u8282\u7801\u5de5\u5177-CSDN\u535a\u5ba2<\/a><\/p>\n\n\n\n
Java\u5b89\u5168\u4e4bJavassist\u52a8\u6001\u7f16\u7a0b – nice_0e3 – \u535a\u5ba2\u56ed<\/a><\/p>\n\n\n\n
javassist\u4f7f\u7528\u5168\u89e3\u6790 – rickiyang – \u535a\u5ba2\u56ed<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u672a\u5b8c\u5f85\u7eed\u3002\u3002\u3002 0x01 Javassist\u662f\u4ec0\u4e48 \u4e00\u4e2a\u7528\u4e8e\u52a8\u6001\u4fee\u6539\u5b57\u8282\u7801\u7684\u5e93\uff0c\u4e3b\u8981\u5b9e\u73b0\u4e86\u4fee\u6539\u7c7b\u3001\u5b9a\u4e49\u65b0\u7c7b\u3001\u4ee3 […]<\/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-1023","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\/1023","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=1023"}],"version-history":[{"count":1,"href":"http:\/\/www.nokws.top\/index.php\/wp-json\/wp\/v2\/posts\/1023\/revisions"}],"predecessor-version":[{"id":1024,"href":"http:\/\/www.nokws.top\/index.php\/wp-json\/wp\/v2\/posts\/1023\/revisions\/1024"}],"wp:attachment":[{"href":"http:\/\/www.nokws.top\/index.php\/wp-json\/wp\/v2\/media?parent=1023"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.nokws.top\/index.php\/wp-json\/wp\/v2\/categories?post=1023"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.nokws.top\/index.php\/wp-json\/wp\/v2\/tags?post=1023"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}