酷应用

Charles 4.5.1逆向工程/破解

工具作者：HackerEye 2019-10-26 23:45:18

Charles 4.5.1逆向破解

前两天剁了Burp Pro 2.1.04破解版，今天写写如何破解Charles 4.5.1。该文主要以逆向与软件安全为方向编写（作者scz）。你也可参阅Charles破解版/破解工具找到你想要的。 Charles如果未注册，启动时有个10s倒计时，30天试用期，每运行30分钟就自动退出。 Charles缺省是用其自带JDK 11启动的:

C:\Program Files\Charles\jdk\

正常注册流程是:

启动Charles->Help->Register Charles->输入Registered Name/License Key

这里会弹一个对话框，有Register、Cancel两个按钮。如何找到Register按钮对应的代码？假设Register按钮用到了JButton，在按钮上显示"Register"这个字符串时会用到javax.swing.AbstractButton.setText()，查看它的调用栈回溯，或许就能定位Register按钮对应的代码。对javax.swing.AbstractButton.setText()设断，命中时:

[1] javax.swing.AbstractButton.setText (AbstractButton.java:297), pc = 0
[2] javax.swing.AbstractButton.init (AbstractButton.java:2,128), pc = 6
[3] javax.swing.JButton.<init> (JButton.java:131), pc = 18
[4] javax.swing.JButton.<init> (JButton.java:104), pc = 3
[5] com.xk72.charles.gui.frames.RegisterFrame.<init> (null), pc = 45
[6] com.xk72.charles.gui.menus.HelpMenu$4.actionPerformed (null), pc = 8
[7] javax.swing.AbstractButton.fireActionPerformed (AbstractButton.java:1,967), pc = 83

爽到了，关注"com.xk72.charles.gui.frames.RegisterFrame.class"。比起Burp Pro 2.1.04，Charles 4.5.1的混淆程度太弱，说是一马平川不为过。据说Charles早期版本没有混淆过，比如4.0.2，我以前没接触过。

Charles 4.5.1反编译

C:\Program Files\Charles\lib\charles.jar

com.xk72.charles.gui.frames.RegisterFrame.class

public class RegisterFrame extends JDialog
{
    private final JTextField    tName;
    private final JTextField    tSerial;
    /*
     * Register按钮
     */
    private final JButton       bRegister;
    /*
     * Cancel按钮
     */
    private final JButton       bCancel;
 
    public RegisterFrame ( Frame paramFrame )
    {
        super( paramFrame, true );
        setTitle( "Register Charles" );
        this.tName      = new JTextField( 20 );
        this.tSerial    = new JTextField( 20 );
        this.bRegister  = new JButton( "Register" );
        this.bCancel    = new JButton( "Cancel" );
 
        Container   localContainer;
 
        (localContainer = getContentPane()).setLayout( new MigLayout( "wrap,fill", "[label][fill,grow]" ) );
 
        localContainer.add( new JLabel( "Registered Name:" ) );
        localContainer.add( this.tName );
        localContainer.add( new JLabel( "License Key:" ) );
        localContainer.add( this.tSerial );
        localContainer.add( this.bCancel, "tag cancel,split 2,span,center" );
        localContainer.add( this.bRegister, "tag ok" );
        this.bCancel.addActionListener( new gTDF( this ) );
        /*
         * 在此添加Register按钮的处理代码，据此关注
         *
         * com.xk72.charles.gui.frames.PeRA.class
         */
        this.bRegister.addActionListener( new PeRA( this ) );
        pack();
        if ( paramFrame != null )
        {
           ( paramFrame = new Point( paramFrame.getLocation() ) ).translate( 20, 20 );
            setLocation( paramFrame );
        }
        getRootPane().setDefaultButton( this.bRegister );
        getRootPane().getInputMap(1).put( KeyStroke.getKeyStroke( "ESCAPE" ), "escape" );
        getRootPane().getActionMap().put( "escape", new RegisterFrame.3( this ) );
    }

com.xk72.charles.gui.frames.PeRA.class

import com.xk72.charles.YQUd;
 
final class PeRA implements ActionListener
{
    PeRA( RegisterFrame paramRegisterFrame )
    {
    }
 
    public final void actionPerformed ( ActionEvent paramActionEvent )
    {
        paramActionEvent    = RegisterFrame.tEdg( this.tEdg ).getText().trim();
 
        String  str = RegisterFrame.TryJ( this.tEdg ).getText().trim();
 
        if ( ( paramActionEvent.length() > 0 ) && ( str.length() > 0 ) )
        {
            Object  localObject;
 
            /*
             * 为了注册成功，YQUd.tEdg()必须返回null。据此关注
             *
             * com.xk72.charles.YQUd.class
             */
            if ( ( localObject = YQUd.tEdg( paramActionEvent, str ) ) != null )
            {
                /*
                 * 注册失败
                 */
                ExtendedJOptionPane.tEdg( this.tEdg, localObject, "Charles Registration", 2 );
                return;
            }
            /*
             * 注册成功，显示注册信息
             */
            ExtendedJOptionPane.tEdg( this.tEdg, "Thank you for registering. Charles will now close. Please start Charles again to continue.", "Charles Registration", 1 );
            ( localObject = CharlesContext.getInstance() ).getConfiguration().getRegistrationConfiguration().setName( paramActionEvent );
            ( ( CharlesContext )localObject ).getConfiguration().getRegistrationConfiguration().setKey( str );
            ( ( CharlesContext )localObject ).exit( 0, true );
        }
    }
}

YQUd.class共有5个public method:

public com.xk72.charles.YQUd();
public static boolean tEdg();
public static void TryJ();
public static java.lang.String NCuT();
public static java.lang.String tEdg(java.lang.String, java.lang.String);

com.xk72.charles.YQUd.class

public final class YQUd
{
    private static YQUd TryJ;
    /*
     * 为true时表示已注册
     */
    private boolean     NCuT;
 
    public YQUd ()
    {
        this.NCuT   = false;
        this.Rarr   = "Unregistered";
    }
 
    /*
     * 为true时表示已注册
     */
    public static boolean tEdg ()
    {
        YQUd    var0    = TryJ;
 
        return TryJ.NCuT;
    }
 
    public static void TryJ ()
    {
        TryJ    = new YQUd();
    }
 
    /*
     * 这是要显示到"About Charles"的内容
     */
    public static String NCuT ()
    {
        YQUd    var0    = TryJ;
 
        switch( gTDF.tEdg[var0.aqrV.ordinal()] )
        {
        case 1:
            return var0.Rarr;
        case 2:
            return var0.Rarr + " - Site License";
        case 3:
            return var0.Rarr + " - Multi-Site License";
        default:
            return var0.Rarr;
        }
    }
 
    /*
     * 务必让本函数返回null
     */
    public static String tEdg ( String var0, String var1 )
    {
        YQUd    var3;
 
        try
        {
            var3    = new YQUd( var0, var1 );
        }
        catch ( LicenseException var2 )
        {
            return var2.getMessage();
        }
        TryJ    = var3;
        return null;
    }

编辑YQUd.java:

package com.xk72.charles;
 
public final class YQUd
{
    /*
     * 只Patch这5个public method，其他private的扔掉即可
     */
 
    public YQUd ()
    {
    }
 
    /*
     * 为true时表示已注册
     */
    public static boolean tEdg ()
    {
        return( true );
    }
 
    public static void TryJ ()
    {
    }
 
    /*
     * 这是要显示到"About Charles"的内容，这个内容任意
     */
    public static String NCuT ()
    {
        return "Anyting - Site License";
    }
 
    /*
     * 务必让本函数返回null
     */
    public static String tEdg ( String var0, String var1 )
    {
        return null;
    }
}

编译YQUd.java得到新的YQUd.class，替换charles.jar中的YQUd.class。比起Burp，破解Charles实在是太简单了。要点是定位YQUd.class，每个版本混淆后的名字都不一样，需要重新定位。由于已经讲清楚原理，以后破解都不需要动态调试设断，直接在反编译器中静态定位。作者：scz

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原文链接 https://www.ijiandao.com/safe/tools/328384.html

Charles 4.5.1 Charles

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