Prezi_Auth_Bypass/Program.cs at main · Recoodev/Prezi_Auth_Bypass · GitHub

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using System;
using Titanium.Web.Proxy;
using Titanium.Web.Proxy.EventArguments;
using Titanium.Web.Proxy.Models;
using System.Runtime.InteropServices;
using Microsoft.Win32;
using System.Threading.Tasks;

namespace PreziBypass
{
    class Program
    {
        [DllImport("wininet.dll")]
        public static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int dwBufferLength);

        private const int INTERNET_OPTION_SETTINGS_CHANGED = 39;
        private const int INTERNET_OPTION_REFRESH = 37;

        static void Main()
        {
            var proxyServer = InitializeProxy();
            SetProxy("127.0.0.1:8000");
            Console.WriteLine(@"

                          :     ..     :
                   .      -.    --    .-      .
                    :.    .=.   ==   .=.    .:
                     --.   ==. .==. .==   .--
              .:.     -=-  -==.:==:.==-  -=-     .:.
                .--:   -==::===-==-===::==-   :--.
                  .-=-:.-================-.:-=-.
           .::..    :========================:    ..::.
              .:-==---======================---==-:.
                  :-==========================-:
          .:::::::---========================---:::::::.
             ...::--==========================--::...
                 .:-==========================-:.
            .:-====--========================--====-:.
          ..       .-========================-.       ..
                 :===-:====================:-===:
              .--:.  .-==-==============-==-.  .:--.
            ..      :==-.:===-======-===:.-==:      ..
                   --:   ==- :==::==: -==   :--
                 .:.    -=:  :=-  -=:  :=-    .:.
                       .=.   :=.  .=:   .=.
                       -     --    --     -
                      .      -      -      .
                             .      .

");
            Console.WriteLine("Waiting...");
            while (true) { }
        }

        private static ProxyServer InitializeProxy()
        {
            var proxyServer = new ProxyServer();
            proxyServer.BeforeResponse += OnResponse;

            var explicitEndPoint = new ExplicitProxyEndPoint(System.Net.IPAddress.Any, 8000, true);
            proxyServer.AddEndPoint(explicitEndPoint);
            proxyServer.Start();

            return proxyServer;
        }

        private static async Task OnResponse(object sender, SessionEventArgs e)
        {
            if (e.HttpClient.Request.Url == "https://prezi.com/api/desktop/license/json/")
            {
                var bodyString = await e.GetResponseBodyAsString();
                Console.WriteLine("Bypassing...");

                if (bodyString.Contains("false"))
                {
                    bodyString = bodyString.Replace("false", "true");
                    e.SetResponseBody(System.Text.Encoding.UTF8.GetBytes(bodyString));
                    Console.WriteLine("Done...");
                    DisableProxy();
                }
            }
        }

        private static void SetProxy(string proxyAddress)
        {
            UpdateRegistrySettings(1, proxyAddress);
            NotifyOSSettingsChanged();
        }

        private static void DisableProxy()
        {
            UpdateRegistrySettings(0);
            NotifyOSSettingsChanged();
        }

        private static void UpdateRegistrySettings(int enable, string proxyAddress = null)
        {
            using RegistryKey registry = Registry.CurrentUser.OpenSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings", writable: true);
            registry.SetValue("ProxyEnable", enable);

            if (proxyAddress != null)
            {
                registry.SetValue("ProxyServer", proxyAddress);
            }
        }

        private static void NotifyOSSettingsChanged()
        {
            _ = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_SETTINGS_CHANGED, IntPtr.Zero, 0);
            _ = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_REFRESH, IntPtr.Zero, 0);
        }
    }
}