.NET P****** CMS 逆向工程

　　(应一些园友建议，我把敏感字段去掉)

　　其实当初我的目的是很纯洁的，只是想找一个简单的网站生成模板，由于对.net更熟悉一点，就去搜索了.net框架的CMS，看它的介绍挺强大的，符合最初的目的，但是下下来之后发现最新版本是要钱的，低一级的版本免费，但是免费的生成出来的东西会有他们公司的版权，这就让我不能忍了，免费就免费啊，搞个纯净点的不行啊，GOOGLE是强大的，所以我尝试的去搜索看有没有破解的版本，发现搜出来的一律都是免费版的去掉版权的版本，擦，去个版权就叫破解了么，而且还是低一级的版本，略微坑爹。.NET的东西理论上没有什么不可以破解的，之前由于项目需要，偶尔也会去破解一些商业的.NET软件，学习学习嘛，破解也不是什么罪大恶极的事，只要你不破坏别人的利益就行，所以我就抱着学习的心态去看了一下P*****的源代码，罪过罪过。只是学习。

　　本人声明，下面的内容只是个人研究所用，不作为任何商业目的，如果有人看了本篇文章做出任何违法之事，本人不负任何责任责任。by Zengg

　　破解所需软件：Reflector，ILSpy，de4dot

　　Reflector和ILSpy其实是一个性质的，都是用来查看别人的源代码，由于有时我发现Reflector查看方法的时候会出现一些错误，所以就用ILSPY配合着用。

　　de4dot，脱壳和反混搅的利器，一般商业软件都会加壳或者用了混搅代码，让一些人就算看到代码也不明白写的是什么，有了这个神器，妈妈再也不用担心我看到乱码了。。。当然有时也不是万能的，90%都能还原吧。

P******版本：V3.0

这是V3.0的基本样貌

　按照官网的说法，只要把域名和对应的注册码填到web.config里面就可以了。

Web.config

　　可以看到Url是域名,License就是填写注册码的地方，由于域名是唯一的，我们不难想象出Url肯定是作为生成注册码的主要参照物，说个题外话，破解嘛，看你是要暴力破解还是文艺破解，暴力破解就是把代码注入他的DLL，从而绕过他的验证达到注册的目的，文艺嘛，就是大家有话好好说，不改动他的DLL，但是需要根据他提供的一些信息去推测软件作者的加密思想，只要你明白了加密核心思想，就能从源码中找出蛛丝马迹，由于软件里的源码肯定只存在解密的步骤，加密的步骤就需要大家反推出来了，有木有一种当侦探的赶脚。。。。。当然，本人只是业余人士，大牛们看到心里鄙视就好，不用说出来。。会打击人的.by Zengg

　　言归正传，我们已经知道了URL是生成注册码的参照物，以后就按着这个线索去查找，其实上面还有一个重要的线索，”License”,由于注册码肯定是要从配置文件读取，读取之后就是验证的步骤，这验证的步骤就是我们需要去的地方，读取License的值，大家会想一下.NET的做法，是不是ConfigurationManager.AppSettings["License"]，现在由于程序员的水平高低不齐，一般来说都会像上述那样去写，这样就暴露了获取验证码的地方，我们就可以定位到所有有”License”内容的代码段去，所以说，以后大家写核心解密代码的时候多留一个心眼，把敏感字段写入资源里面，至少给破解的人增加一点难度。

　　Bin目录下有很多的DLL，其中一个肯定就是藏有解密的地方

　　

　　当然由于我已经破解过了，筛选DLL的过程就不描述了，P*******.web.dll，就是解密的地方，用de4dot先给DLL脱壳。

然后我们用ILSPY打开这个DLL

　　

　　会看到。。尼玛还是这么坑爹，所有东西基本都是乱码，让人不能直视，具体为什么我也没研究过，由于我们也不需要去明白这些乱码写的是神马，按照上面的思路我们要查找所有含有License字段的代码段，这步骤可以用软件实现。

　　利用ILSPY，在SEARCH里填上License,就可以看到出来很多方法，当初很疑惑为什么有这么多地方用到验证注册码，验证的算法都是一样的，难道作者以为你各个角落都验证一遍就不能破解了么。。

仔细看了搜索出来的结果，他是一些重要的表操作时就会去验证一遍，挺谨慎的嘛，上面标蓝的地方就是登陆的时候主页验证，我们从这里开始。

点击进入该方法

　　从上面代码可以看出，其实注册码分为两个部分，以’g’字符隔开，前面一部分是由MD5加密，后面一部分暂时不清楚，前面我们推论注册码是由URL来的，我们有理由怀疑

的this.j3G1XJp4Xe, this.EsQ1WjnrPD肯定有一个是URL字段，至于另一个是什么得去寻找，一般来说我们初始化的时候会在类的构造函数初始化，相信在构造函数里面，我们会知道这两个字段的意思，忘记了这是web，我们应该从Page_load页面加载里面去寻找：

protected void Page_Load(object sender, EventArgs e)
{
    string connectionString;
    int[] num;
    while (true)
    {
        IL_24F:
        this.Qi911iK25u = ":" + master_login.tDhwcmhvMr4nRqlEc9G(base.Request)["SERVER_PORT"];
        while (true)
        {
            IL_232:
            if (this.Qi911iK25u == ":80")
            {
                this.Qi911iK25u = "";
            }
            this.EsQ1WjnrPD = this.Jbr136aAXj(master_login.MpkoQbh7EvS0PEFh1B3(master_login.rEXTLBh8uXG8glkV91p(ConfigurationManager.AppSettings, "Url").ToString()));
            master_login.xncn9GhN2hVekNKKcgK();
            if (!master_login.DMFvcGhZ55jZPl06Jhl())
            {
                goto IL_FA;
            }
            goto IL_215;
            IL_1CA:
            bool flag;
            while (!(flag = (base.Request.Form["username"] == null)))
            {
                this.NTR1li2VG4();
                this.Yqx1ac8tvS = new Conn();
                connectionString = master_login.lPkTddhObfF6vvZs9Ta(this.Yqx1ac8tvS);
                num = new int[]
                {
                    ,
                    ,
                    ,
                    ,
                    ,
                    ,
                    ,
                    ,
                    ,
                    ,
                    ,
                    ,

                };
                while (true)
                {
                    this.j3G1XJp4Xe = this.Yqx1ac8tvS.GetString(num);
                    num = new int[]
                    {
                        ,
                        ,
                        ,
                        ,
                        ,
                        ,
                        ,
                        ,
                        ,
                        ,
                        ,
                        ,
                        ,
                        ,
                        ,
                        ,
                        ,
                        ,
                        ,
                        ,
                        ,

                    };
                    this.DDU1A3AUYe = this.Yqx1ac8tvS.GetString(num);
                    int expr_AA = ;
                    if (master_login.xncn9GhN2hVekNKKcgK())
                    {
                        switch (expr_AA)
                        {
                        case :
                            goto IL_232;
                        case :
                        case :
                            goto IL_FA;
                        case :
                        case :
                            goto IL_215;
                        case :
                            goto IL_176;
                        case :
                            continue;
                        case :
                            goto IL_276;
                        case :
                            goto IL_2AE;
                        case :
                            goto IL_1CA;
                        case :
                            goto IL_24F;
                        case :
                            goto IL_2F5;
                        case :
                            return;
                        }
                        break;
                    }
                    break;
                }
                goto IL_187;
            }
            return;
            IL_FA:
            this.KpC1B5ZX4p = this.Jbr136aAXj(master_login.tDhwcmhvMr4nRqlEc9G(master_login.rnmK14hAjv0aZay85lt(this))["SERVER_NAME"].ToLower());
            if (!master_login.MAaokyhM2irc0iduDgg(this.KpC1B5ZX4p, "localhost"))
            {
                goto IL_1CA;
            }
            int num2 = this.KpC1B5ZX4p.IndexOf(this.EsQ1WjnrPD);
            string a;
            if (num2 >= )
            {
                a = this.KpC1B5ZX4p.Substring(num2, this.KpC1B5ZX4p.Length - num2);
                goto IL_176;
            }
            master_login.a6dZyFh3MrLLslJyyx5(this).Write("<script>location.href='http://" + this.EsQ1WjnrPD + this.Qi911iK25u + "/e/master/login.aspx';</script>");
            goto IL_215;
            IL_187:
            if (!flag)
            {
                this.KpC1B5ZX4p = this.EsQ1WjnrPD;
                goto IL_1CA;
            }
            master_login.a6dZyFh3MrLLslJyyx5(this).Write("<script>location.href='http://" + this.EsQ1WjnrPD + this.Qi911iK25u + "/e/master/login.aspx';</script>");
            base.Response.End();
            goto IL_1CA;
            IL_215:
            master_login.a6dZyFh3MrLLslJyyx5(this).End();
            goto IL_1CA;
            IL_176:
            flag = !(a == this.EsQ1WjnrPD);
            goto IL_187;
        }
    }
    IL_276:
    num = new int[]
    {
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,

    };
    this.wht18BDAPc = this.Yqx1ac8tvS.GetString(num);
    num = new int[]
    {
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,
        ,

    };
    IL_2AE:
    this.eA41Kphpj9 = this.Yqx1ac8tvS.GetString(num);
    this.kwo1i4CnR3 = this.ne91erSgMV();
    this.GqT1YHkWWq = new OleDbConnection(connectionString);
    master_login.qOyjNXhFe7tECUDuWP7(this.GqT1YHkWWq);
    this.gII1QQxT9S();
    this.aK41NqyDHj();
    this.Tov1vquSFP();
    IL_2F5:
    this.GqT1YHkWWq.Close();
}

Load

　　仔细看上面的代码，我们会发现，this.EsQ1WjnrPD就是URL，但是经过了一些处理，即去掉了域名前面的“WWW.”，this.j3G1XJp4Xe是经过特殊算法得出字符串。by Zengg

算法源码：

  {
  int[] num = new int[]{
                             ,
                            ,
                            ,
                            ,
                            ,
                            ,
                            ,
                            ,
                            ,
                            ,
                            ,
                            ,

                              };
  this.j3G1XJp4Xe = GetString(num);
}

 public string GetString(int[] num)
        {
            string text = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789~!@#$%^&*()_+-={}[]:\";'<>?,./\\| ";
            StringBuilder stringBuilder = new StringBuilder();
            string result;
            if (num.Length > )
            {
                for (int i = ; i < num.Length; i++)
                {
                    stringBuilder.Append(text[num[i]]);
                }
                result = stringBuilder.ToString();
            }
            else
            {
                result = "";
            }
            return result;
        }

j3G1XJp4Xe

MD5算法：

public class Md5
        {
            public string Get_Md5(string s)
            {
                MD5 mD = new MD5CryptoServiceProvider();
                Encoding encoding = Encoding.GetEncoding("UTF-8");
                string s2 = "pageadmin cms";
                byte[] array = mD.ComputeHash(encoding.GetBytes(s));
                byte[] array2 = mD.ComputeHash(encoding.GetBytes(s2));
                StringBuilder stringBuilder = new StringBuilder();
                for (int i = ; i < array.Length; i++)
                {
                    stringBuilder.Append(((int)(array[i] + array2[i])).ToString("x").PadLeft(, ''));
                }
                return stringBuilder.ToString();
            }
            public string Md5_Num(string s)
            {
                string text = "";
                for (int i = ; i < s.Length; i++)
                {
                    if (i == s.Length - )
                    {
                        text += this.GetNum(s[i].ToString()).ToString();
                    }
                    else
                    {
                        text = text + this.GetNum(s[i].ToString()).ToString() + ",";
                    }
                }
                return text;
            }
            private int GetNum(string C)
            {
                string text = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789~!@#$%^&*()_+-={}[]:\";'<>?,./\\| ";
                int num = text.IndexOf(C);
                int result;
                if (num < )
                {
                    result = -;
                }
                else
                {
                    result = num;
                }
                return result;
            }
        }

MD5

　　第一部分的注册码其实已经得出来的，即this.j3G1XJp4Xe+this.EsQ1WjnrPD的字符串经过MD5加密就是第一部分的注册码，下面我们去寻找第二部分的线索，重新回到上次搜索"License"的列表，经过一个个的排查，发现了重要线索。

　

　　进入这个方法

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" alt="" />

　　从上面的代码可以推出，后部分注册码，其实就是URL的长度乘以2，到这里其实注册码差不多已经出来了，基本格式

MD5(this.j3G1XJp4Xe+this.EsQ1WjnrPD)+“g”+URL.Length*2+?....注册码例子：ef12a131357bb3e67396e01061141385da5149g143

剩余核心算法：

 private static bool g031FKBmaF(string A_1)
        {
            string[] array = new string[];
            array[] = "^127[.]0[.]0[.]1$";
            array[] = "^localhost$";
            array[] = "^10[.]\\d{1,3}[.]\\d{1,3}[.]\\d{1,3}$";
            array[] = "^172[.]((1[6-9])|(2\\d)|(3[01]))[.]\\d{1,3}[.]\\d{1,3}$";
            array[] = "^192[.]168[.]\\d{1,3}[.]\\d{1,3}$";
            string[] array2 = array;
            int num = ;
        IL_45:
            if (num >= array2.Length)
            {
                bool result = false;
                return result;
            }
            if (A_1 != null)
            {
                goto IL_64;
            }
            string arg_58_0 = "";
        IL_55:
            if (Regex.IsMatch(arg_58_0, array2[num]))
            {
                bool result = true;
                return result;
            }
            num++;
            goto IL_45;
        IL_64:
            arg_58_0 = A_1;
            goto IL_55;
        }
        private static string Jbr136aAXj(string A_1)
        {
            bool arg_27_0;

            if (g031FKBmaF(A_1))
            {
                arg_27_0 = false;
                goto IL_27;
            }
            arg_27_0 = (A_1.IndexOf(".") >= );
        IL_27:
            string result;
            if (!arg_27_0)
            {
                result = "localhost";
            }
            else
            {
                result = A_1.Replace("www.", "");
            }
            return result;
        }

　　写了这么多也够了，最后一个数字3代表的是.net后缀的域名，这里就不提供完整的程序源码，可能会涉及一些侵权，我写的其实也够详细了，

核心算法也贴出来，大家自己去写一个注册机吧，如果有想要域名对应的注册码的，请邮电我说明正当理由，我会考虑是否给你。

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作者：Zengg
出处：http://www.cnblogs.com/01codeworld/
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