×××××××××××××××××××××××××××××××××××××××××××××URTracker事务跟踪系统是一款功能强大而且易于使用的Web方式的协同工作软件 。它用于帮助公司和团队跟踪工作中的问题，管理和记录这些问题的处理过程。 URTracker向您的团队提供了一个全功能的，高度可定制的软件工具用于报告和跟踪问题、需求、缺陷（BUG）或者任务等事务。它拥有丰富的自定义字段、基于项目和角色的权限控制、简化的工作流、友好的用户界面，以及更多的其他特性。我们非常确信您将会喜欢上URTracker，因为我们相信她正是您所需要的。 ×××××××××××××××××××××××××××××××××××××××××××× 工具介绍：     要研究.NET当然离不开Reflector for .NET 。（Reflector is a class browser for .NET components. It supports assembly and namespace views, type and member search, XML documentation, call and callee graphs, IL, Visual Basic, Delphi and C# decompiler, dependency trees, base type and derived type hierarchies and resource viewers. ）   如果想把代码保存下来，那就需要Reflector的插件Reflector.FileDisassembler了。（The Reflector.FileDisassembler is a little add-in for the new version of Lutz Roeder''''''''s .NET Reflector that you can use to dump the decompiler output to files of any Reflector supported language (C#, VB.NET, Delphi). This is extremely useful if you are searching for a specific line of code as you can use VS.NET''''''''s "Find in Files" or want to convert a class from one language to another.）  下载地址：Reflector for .NET   http://www.aisto.com/roeder/dotnet/                      Reflector.FileDisassembler    http://www.denisbauer.com/NETTools/FileDisassembler.aspx   正文：

严重声明：本文只作科研和学习用途。如果由本文产生的法律纠纷，一概与本人无关。

好了，了解了Reflector咱们就可以动手研究URTracker了。

当然首先用Reflector分析bin文件夹下的文件，一共有12个DLL文件，从他们的名称你也可以猜出个八八九九，反正你不怕麻烦你就挨个用Reflector试好了...^_^最后找到了WebTracker.dll 可疑，因为在Reflector按F3，你可以搜索到很多关于license的东东。哈哈，探究之路开始了。首先看看Lealsoft.URTracker.BLL下有个ServerLicenseProvider类。

public class ServerLicenseProvider : LicenseProvider{      // Methods      static ServerLicenseProvider();      public ServerLicenseProvider();      protected virtual ServerLicense CreateEmptyLicense(Type type);      protected virtual ServerLicense CreateLicense(Type type, string key);      public override License GetLicense(LicenseContext context, Type type, object instance, bool allowExceptions);      protected virtual string GetLicenseData(Type type);      protected virtual Stream GetLicenseDataStream(Type type);      protected virtual bool ValidateLicense(ServerLicense license, out string errorMessage);      protected virtual bool ValidateLicenseData(Type type, string licenseData);

      // Fields      private static readonly ServerLicenseCollector LicenseCollector;

      // Nested Types      private sealed class ServerLicenseCollector      {            // Methods            public ServerLicenseCollector();            public void AddLicense(Type objectType, ServerLicense license);            public ServerLicense GetLicense(Type objectType);            public void RemoveLicense(Type objectType);

            // Fields            private IDictionary _collectedLicenses;      }} 看到没，有几个CreateLicense，GetLicense，ValidateLicense ，ValidateLicenseData，GetLicenseDataStream这几个方法。好，打开看看都是什么东东。

protected virtual ServerLicense CreateLicense(Type type, string key){      char[] chArray1 = new char[1] { '''''''':'''''''' } ;      string[] textArray1 = key.Split(chArray1);      return new URTrackerLicense(type, key, long.Parse(textArray1[1], CultureInfo.InvariantCulture), long.Parse(textArray1[2], CultureInfo.InvariantCulture), textArray1[3], long.Parse(textArray1[4], CultureInfo.InvariantCulture), long.Parse(textArray1[5], CultureInfo.InvariantCulture), textArray1[6]);} 哇！就是新建license，URTrackerLicense后面有几个参数，什么也看不出，感觉是要用":"split开一个字符串。来，打开URTrackerLicense构造函数看看。public URTrackerLicense(Type type, string key, long startTicks, long ticks, string username, long userIndex, long clientCount, string mac) : base(type, key){      this._foundMac = false;      this._ticks = ticks;      this._startTicks = startTicks;      this._username = username;      this._userIndex = userIndex;      this._clientCount = clientCount;      this._mac = mac;      this._macArray = URTrackerLicense.GetMacArray();      this._foundMac = this._macArray.IndexOf(this._mac) > -1;} 哦，看到ticks，startTicks，username，userIndex，clientCount，mac难道这些就是所需参数"到期时间，使用开始时间，用户名，用户名索引，用户数，本机网卡地址"有点意思了。呵呵。找到了 URTrackerLicense 类，你就会知道我们猜测的没有错了。public class URTrackerLicense : ServerLicense{      // Methods      public URTrackerLicense(Type type, string key, long startTicks, long ticks, string username, long userIndex, long clientCount, string mac);      public static ArrayList GetMacArray();

      // Properties      public long ClientCount { get; }      public bool IsExpired { get; }      public string Mac { get; }      public long StartTicks { get; }      public long Ticks { get; }      public long UserIndex { get; }      public string Username { get; }

      // Fields      private long _clientCount;      private bool _foundMac;      private string _mac;      private ArrayList _macArray;      private long _startTicks;      private long _ticks;      private long _userIndex;      private string _username;} 继续，刚才找了CreateLicense，现在开始找ValidateLicenseData。protected virtual bool ValidateLicenseData(Type type, string licenseData){      bool flag1 = false;      char[] chArray1 = new char[1] { '''''''':'''''''' } ;      string[] textArray1 = licenseData.Split(chArray1);      if (textArray1.Length == 7)      {            return (string.Compare("URTracker1Licensed", textArray1[0], true, CultureInfo.InvariantCulture) == 0);      }      return flag1;} 哈哈，就是说刚才分析那个数组中textArray1[0]，必须是URTracker1Licensed！哈哈，这也进一步证实了我们要把注册信息字符串用":"分开的设想。Come on!离成功越来越近了！接着分析ValidateLicense。protected virtual bool ValidateLicense(ServerLicense license, out string errorMessage){      errorMessage = null;      URTrackerLicense license1 = (URTrackerLicense) license;      if (license1.IsExpired)      {            errorMessage = "The License has expired.";            return false;      }      return true;} 哦，知道了！原来是判断URTrackerLicense的属性IsExpired的真假！好，咱们看看属性IsExpired。public bool IsExpired{      get      {            if ((DateTime.Today.Ticks <= this._ticks) && (DateTime.Now.Ticks >= this._startTicks))            {                  return !this._foundMac;            }            return true;      }}  知道了吧！就是判断当前时间要在ticks和startTicks之间！然后再判断Mac的值。 现在查找Mac的相关类或者方法。找到了GetMacArray public static ArrayList GetMacArray(){      ManagementClass class1 = new ManagementClass("Win32_NetworkAdapterConfiguration");      ManagementObjectCollection collection1 = class1.GetInstances();      ArrayList list1 = new ArrayList();      using (ManagementObjectCollection.ManagementObjectEnumerator enumerator1 = collection1.GetEnumerator())      {            while (enumerator1.MoveNext())            {                  ManagementObject obj1 = enumerator1.get_Current();                  if ((bool) obj1.get_Item("IPEnabled"))                  {                        list1.Add(obj1.get_Item("MacAddress").ToString().Replace(":", "").ToUpper());                  }                  obj1.Dispose();            }      }      return list1;} 咱们从这里可以猜测的出，获得的Mac应该是去掉":" 如：01:AB:9E:6T:AB:9E:6T （注意了，是要大写的！）

对照URTrackerLicense的构造函数，我们就明白各字段的含义了。也可以构造出一个伪license。我随便构造一个，string data = "URTracker1Licensed:632598806976562500:735608407859509835:CaoxiCao:0:1000:0:AB9E6TAB9E6T";注意一下那两个ticks字段，需要把当前的ticks时间包含起来才行，否则IsExpired会判断为true的

回到刚才的思路 分析完 CreateLicense，GetLicense，ValidateLicense ，ValidateLicenseData。现在开始分析GetLicenseDataStream

protected virtual Stream GetLicenseDataStream(Type type){      string text3 = type.Assembly.GetName().Name;      type.Assembly.GetName().Version.ToString();      string text1 = "~/licenses/URTRACKER.aspx";      string text2 = null;      try      {            text2 = HttpContext.Current.Server.MapPath(text1);            if (!File.Exists(text2))            {                  text2 = null;            }      }      catch      {      }      if (text2 != null)      {            return new FileStream(text2, FileMode.Open, FileAccess.Read, FileShare.Read);      }      return null;} 知道了，这次知道了licenses生成的地方以及名称就是URTRACKER.aspx！！！

现在只是找到了licese格式，名称和位置，但是具体算法还是没有找到。继续在Lealsoft.URTracker.BLL命名空间找。呵呵！发现个叫EncryptedLicenseProvider的类，看看

居然有个东东！眼睛一亮！protected override Stream GetLicenseDataStream(Type type){      Stream stream1 = base.GetLicenseDataStream(type);      if (stream1 == null)      {            return null;      }      DESCryptoServiceProvider provider1 = new DESCryptoServiceProvider();      provider1.Key = EncryptedLicenseProvider.encryptionKeyBytes;      provider1.IV = EncryptedLicenseProvider.encryptionKeyBytes;      ICryptoTransform transform1 = provider1.CreateDecryptor();      return new CryptoStream(stream1, transform1, CryptoStreamMode.Read);} 因为我们看到了DES!哈哈，知道了，是DES加密！看到调用base.GetLicenseDataStream了吗？就是取得license的内容！！而它的基类就是我们刚刚分析过的ServerLicenseProvider。好，我们下一步搞清楚Key和IV的值。当找到这个静态构造函数时，心一下子揪了起来，成功了吗？快了！static EncryptedLicenseProvider(){      EncryptedLicenseProvider.encryptionKeyBytes = new byte[8] { 0x35, 0x37, 0x42, 50, 0x42, 0x31, 70, 0x36 } ;} ^_^，终于哭了，搞清楚了DES加密啊！可以写代码生成伪licese文家了！本来俺做了个 注册机出来的，怕太对不起作者了，暂不公布了！

把源代码公布吧！

－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－using System;using System.Collections.Generic;using System.Text;using System.Security.Cryptography;using System.IO;

namespace ConsoleApplication2{ class Program {  static void Main(string[] args)  {   byte[] encryptionBytes = new byte[8] { 0x35, 0x37, 0x42, 50, 0x42, 0x31, 70, 0x36 };   DESCryptoServiceProvider provider = new DESCryptoServiceProvider();   provider.Key = encryptionBytes;   provider.IV = encryptionBytes;   ICryptoTransform transform1 = provider.CreateEncryptor();

   string data = "URTracker1Licensed:632572024003281250:735608407859509835:CaoxiCao:0:10000:0111A7C7D865";   Console.WriteLine(System.DateTime.Now.Ticks);  //当前的ticks   byte[] message = Encoding.UTF8.GetBytes(data);   FileStream fs = new FileStream("c:\\URTRACKER.aspx", FileMode.Create,     FileAccess.Write, FileShare.Write);   CryptoStream cs = new CryptoStream(fs, transform1, CryptoStreamMode.Write);   cs.Write(message, 0, message.Length);   cs.Flush();   cs.Close();   fs.Close();

  } }}


转自:http://www.24doings.com/circs_800.do，详情请浏览这个地址。