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scz
发表于 2020-6-5 14:02
标题: 小议JEB3逆向工程
创建: 2020-06-05 12:32
更新:
链接: http://scz.617.cn:8/misc/202006051232.txt
2020.6.1有个JEB Pro 3.19.1.202005071620被放出来了,小钻风说可能是信用卡欺
诈弄来的。当时给他弄了个传统keygen对付着用,第二天他说有人放出另一种keygen,
可以离线算注册码,就是许可证密钥(License key)。这事我以前没干过,有点意思。
以调试方式启动JEB3,用Eclipse Attach。
点击"Manual Key Generation",看到"许可证数据(License data)"。在Eclipse中
Suspend JVM,主线程调用栈回溯是:
org.eclipse.swt.internal.win32.OS.WaitMessage() line: not available [native method]
org.eclipse.swt.widgets.Display.sleep() line: 4528
com.pnfsoftware.jeb.rcpclient.util.SwtUtil.sleep(org.eclipse.swt.widgets.Display) line: 52
com.pnfsoftware.jeb.rcpclient.dialogs.LicenseKeyDialog(com.pnfsoftware.jeb.rcpclient.dialogs.JebDialog).open() line: 395
com.pnfsoftware.jeb.rcpclient.dialogs.LicenseKeyDialog.open() line: 50
com.pnfsoftware.jeb.rcpclient.dialogs.LicenseKeyAutoDialog$3.widgetSelected(org.eclipse.swt.events.SelectionEvent) line: 190
org.eclipse.swt.widgets.TypedListener.handleEvent(org.eclipse.swt.widgets.Event) line: 252
org.eclipse.swt.widgets.EventTable.sendEvent(org.eclipse.swt.widgets.Event) line: 89
org.eclipse.swt.widgets.Display.sendEvent(org.eclipse.swt.widgets.EventTable, org.eclipse.swt.widgets.Event) line: 4105
org.eclipse.swt.widgets.Button(org.eclipse.swt.widgets.Widget).sendEvent(org.eclipse.swt.widgets.Event) line: 1037
org.eclipse.swt.widgets.Display.runDeferredEvents() line: 3922
org.eclipse.swt.widgets.Display.readAndDispatch() line: 3524
com.pnfsoftware.jeb.rcpclient.dialogs.LicenseKeyAutoDialog(com.pnfsoftware.jeb.rcpclient.dialogs.JebDialog).open() line: 394
com.pnfsoftware.jeb.rcpclient.dialogs.LicenseKeyAutoDialog.open() line: 83
com.pnfsoftware.jeb.rcpclient.RcpClientContext.retrieveLicenseKey(java.lang.String) line: 1699
com.pnfsoftware.jeb.rcpclient.RcpClientContext(com.pnfsoftware.jeb.client.AbstractClientContext).prepareCheckLicenseKey() line: 736
com.pnfsoftware.jeb.rcpclient.RcpClientContext(com.pnfsoftware.jeb.client.AbstractClientContext).start() line: 442
com.pnfsoftware.jeb.rcpclient.RcpClientContext.start() line: 1522
com.pnfsoftware.jeb.rcpclient.RcpClientContext.onApplicationReady(com.pnfsoftware.jeb.rcpclient.extensions.app.App) line: 1212
com.pnfsoftware.jeb.rcpclient.JebApp.onApplicationReady() line: 73
com.pnfsoftware.jeb.rcpclient.JebApp(com.pnfsoftware.jeb.rcpclient.extensions.app.App).run() line: 186
com.pnfsoftware.jeb.rcpclient.Launcher.main(java.lang.String[]) line: 35
--------------------------------------------------------------------------
/*
* com.pnfsoftware.jeb.rcpclient.RcpClientContext.retrieveLicenseKey(String) : String
*/
public String retrieveLicenseKey(String licdata)
--------------------------------------------------------------------------
这个函数负责弹框显示"许可证数据(License data)",形参licdata就是对话框里的
数字串。
--------------------------------------------------------------------------
/*
* com.pnfsoftware.jeb.client.AbstractClientContext.prepareCheckLicenseKey() : void
*/
private void prepareCheckLicenseKey()
{
ip.RF();
String str1 = this.pm.getString(".LicenseKey");
int[] arrayOfInt = new int[1];
int i = 0;
if (!Strings.isBlank(str1))
{
long[] arrayOfLong1 = ek.Ql();
for (long l2 : arrayOfLong1)
{
Fp localFp2 = new Fp(l2);
if (localFp2.RF(str1, arrayOfInt))
{
i = 1;
break;
}
}
}
if (i == 0)
{
ip.Ql();
/*
* 733行,返回MachineId
*/
long l1 = ek.RF();
/*
* 734行
*/
Fp localFp1 = new Fp(l1);
/*
* 735行,返回"许可证数据(License data)"
*/
String str2 = localFp1.RF();
/*
* 736行,str2即"许可证数据(License data)",str1即"许可证密钥(License key)"
*/
str1 = retrieveLicenseKey(str2);
ip.RF();
if (!localFp1.RF(str1, arrayOfInt))
{
logger.info(S.s(437), new Object[0]);
terminate();
}
this.pm.setString(".LicenseKey", str1.trim());
}
Licensing.setLicenseTimestamp(arrayOfInt[0]);
int j = Licensing.getExpirationTimestamp();
if (j != 0) {
if ((j < 0) || (getStartTimestamp() >= j))
{
this.pm.setBoolean(".SupportExpired", Boolean.valueOf(true));
notifySupportExpired();
}
else if (this.pm.getBoolean(".SupportExpired"))
{
this.pm.setBoolean(".SupportExpired", Boolean.valueOf(false));
}
}
}
--------------------------------------------------------------------------
/*
* com.pnfsoftware.jebglobal.Fp
*/
public class Fp
{
/*
* MachineId
*/
private long RF;
/*
* 设置MachineId
*/
public Fp(long paramLong)
{
this.RF = paramLong;
}
/*
* 返回"许可证数据(License data)"
*/
public String RF()
{
try
{
ByteArrayOutputStream localByteArrayOutputStream = new ByteArrayOutputStream();
LEDataOutputStream localLEDataOutputStream = new LEDataOutputStream(localByteArrayOutputStream);
localLEDataOutputStream.writeLong(this.RF);
localLEDataOutputStream.close();
/*
* 41行,localByteArrayOutputStream.toByteArray()等于8字节little-endian序
* 的MachineId
*
* this.RF也是MachineId
*
* 返回"许可证数据(License data)"
*/
byte[] arrayOfByte = wR.RF(this.RF, localByteArrayOutputStream.toByteArray(), null);
/*
* 42行,对RC4结果进一步处理,就是格式化输出,没有数学变换
*/
return wR.RF(arrayOfByte);
}
catch (Exception localException) {}
return "";
}
--------------------------------------------------------------------------
com.pnfsoftware.jebglobal.wR.RF(long, byte[], int[]) line: 104
com.pnfsoftware.jebglobal.Fp.RF() line: 41 [local variables unavailable]
com.pnfsoftware.jeb.rcpclient.RcpClientContext(com.pnfsoftware.jeb.client.AbstractClientContext).prepareCheckLicenseKey() line: 735 [local variables unavailable]
com.pnfsoftware.jeb.rcpclient.RcpClientContext(com.pnfsoftware.jeb.client.AbstractClientContext).start() line: 442
com.pnfsoftware.jeb.rcpclient.RcpClientContext.start() line: 1522
com.pnfsoftware.jeb.rcpclient.RcpClientContext.onApplicationReady(com.pnfsoftware.jeb.rcpclient.extensions.app.App) line: 1212
com.pnfsoftware.jeb.rcpclient.JebApp.onApplicationReady() line: 73
com.pnfsoftware.jeb.rcpclient.JebApp(com.pnfsoftware.jeb.rcpclient.extensions.app.App).run() line: 186
com.pnfsoftware.jeb.rcpclient.Launcher.main(java.lang.String[]) line: 35
--------------------------------------------------------------------------
/*
* com.pnfsoftware.jebglobal.wR.RF(long, byte[], int[]) : byte[]
*/
public static byte[] RF(long paramLong, byte[] paramArrayOfByte, int[] paramArrayOfInt)
{
try
{
if (paramArrayOfByte == null) {
return null;
}
ByteArrayOutputStream localByteArrayOutputStream = new ByteArrayOutputStream();
LEDataOutputStream localLEDataOutputStream = new LEDataOutputStream(localByteArrayOutputStream);
localLEDataOutputStream.writeInt(64 + paramArrayOfByte.length);
/*
* 113行,随机数
*/
localLEDataOutputStream.writeInt(UL.nextInt());
localLEDataOutputStream.writeInt(5);
/*
* 116行,占坑,后面会回填CRC32
*/
localLEDataOutputStream.writeInt(0);
localLEDataOutputStream.writeInt(Licensing.user_id);
localLEDataOutputStream.writeLong(Licensing.license_id);
/*
* 120行,MachineId
*/
localLEDataOutputStream.writeLong(paramLong);
localLEDataOutputStream.writeInt(Licensing.build_type);
localLEDataOutputStream.writeInt(AbstractContext.app_ver.getMajor());
localLEDataOutputStream.writeInt(AbstractContext.app_ver.getMinor());
localLEDataOutputStream.writeInt(AbstractContext.app_ver.getBuildid());
localLEDataOutputStream.writeLong(AbstractContext.app_ver.getTimestamp());
int i = (int)((System.currentTimeMillis() - Tk) / 1000L);
localLEDataOutputStream.writeInt(i);
/*
* 131行
*
* com.pnfsoftware.jebglobal.wR.Az() : int
*/
int j = Az();
localLEDataOutputStream.writeInt(j);
/*
* 135行,随机数
*/
int k = UL.nextInt();
localLEDataOutputStream.writeInt(k);
/*
* 138行,MachineId
*/
localLEDataOutputStream.write(paramArrayOfByte);
localLEDataOutputStream.close();
byte[] arrayOfByte1 = localByteArrayOutputStream.toByteArray();
ByteBuffer localByteBuffer = ByteBuffer.wrap(arrayOfByte1);
localByteBuffer.order(ByteOrder.LITTLE_ENDIAN);
localByteBuffer.putInt(0, arrayOfByte1.length - 8);
/*
* 145行,计算[0x10:]的CRC32,回填相应字段
*/
localByteBuffer.putInt(12, Hash.calculateCRC32(Arrays.copyOfRange(arrayOfByte1, 16, arrayOfByte1.length)));
byte[] arrayOfByte2 = new byte[16];
for (int m = 0; m < 8; m++) {
arrayOfByte2[m] = arrayOfByte1[m];
}
for (m = 8; m < 16; m++) {
arrayOfByte2[m] = RF[(m - 8)];
}
/*
* 154行,RC4()
*/
xS.RF(arrayOfByte2, arrayOfByte1, 8, arrayOfByte1.length);
if ((paramArrayOfInt != null) && (paramArrayOfInt.length >= 1)) {
paramArrayOfInt[0] = k;
}
return arrayOfByte1;
}
catch (Exception localException) {}
return null;
}
--------------------------------------------------------------------------
/*
* RC4()
*/
com.pnfsoftware.jebglobal.xS.RF(byte[], byte[], int, int) : void
--------------------------------------------------------------------------
对前述xS.RF()的第2形参尝试手工解码:
--------------------------------------------------------------------------
48 00 00 00 // +0x0 64 + 8
05 05 6e 1d // +0x4 随机数
05 00 00 00 // +0x8 固定值5
4a 56 83 5f // +0xc 后面所有数据的CRC32
06 58 76 3e // +0x10
// User ID: 1047943174
9b b9 d0 17 50 fe da 00 // +0x14
// License ID: 61641164873316763
xx xx xx xx xx xx xx xx // +0x1c MachineId
... // +0x24 (后略)
--------------------------------------------------------------------------
RC4是流式对称加密算法,从out[]解密出in[],即可得到LicenseId、MachineId。
简化版调用关系:
--------------------------------------------------------------------------
RcpClientContext.start // 3.19.1.202005071620
AbstractClientContext.start // RcpClientContext:1522
AbstractClientContext.prepareCheckLicenseKey // AbstractClientContext:442
ek.RF // AbstractClientContext:733
// 返回MachineId
Fp.RF // AbstractClientContext:735
// 返回"许可证数据(License data)"的String形式
// 对话框中显示之
wR.RF // Fp:41
// 返回"许可证数据(License data)"的byte[]形式
xS.RF // wR:154
// RC4()/PrivateTransform()
RcpClientContext.retrieveLicenseKey // AbstractClientContext:736
// 形参是"许可证数据(License data)"的String形式
--------------------------------------------------------------------------
这种离线keygen确实更通用,参与运算的LicenseId、MachineId都从LicenseData解
密获取,同时适用于Windows、Linux、Mac,不需要关心MachineId的数据源在不同OS
上的获取方式。
说一下过期时间的事。JEB3的这个过期时间我不确认是否真地影响过期后的继续使用,
曾经有过不同的情况,比如只影响升级,不影响继续使用。如果真影响过期后的继续
使用,可能得动态Patch一下这个类:
com.pnfsoftware.jeb.client.Licensing
具体是这个函数:
com.pnfsoftware.jeb.client.Licensing.getExpirationTimestamp() : int
该函数中用到常量86400,将之改成864000,则过期时间变成"2030-05-30"。不要贪
心地改成8640000,否则过期时间回绕到1984。
$ fc /b old new
00000034: 01 0D
00000035: 51 2F
00000036: 80 00
可以用你喜欢的任一动态Patch技术去完成内存中的常量修改,不建议静态Patch。
感慨一句,JEB2真是我的伤心之地,以至于每看到一个新版JEB出场,都要长叹一声,
欲语还休。 |
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