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BitBetter/Program.cs

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C#
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using System;
using System.IO;
using System.Linq;
using System.Security.Cryptography.X509Certificates;
using Mono.Cecil;
using Mono.Cecil.Cil;
using Mono.Cecil.Rocks;
namespace bitwardenSelfLicensor
{
class Program
{
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static int Main(string[] args)
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{
string cerFile;
string corePath;
if(args.Length >= 2) {
cerFile = args[0];
corePath = args[1];
} else if (args.Length == 1) {
cerFile = args[0];
corePath = "/app/Core.dll";
}
else {
cerFile = "/newLicensing.cer";
corePath = "/app/Core.dll";
}
var module = ModuleDefinition.ReadModule(new MemoryStream(File.ReadAllBytes(corePath)));
var cert = File.ReadAllBytes(cerFile);
var x = module.Resources.OfType<EmbeddedResource>()
.Where(r => r.Name.Equals("Bit.Core.licensing.cer"))
.First();
Console.WriteLine(x.Name);
var e = new EmbeddedResource("Bit.Core.licensing.cer", x.Attributes, cert);
module.Resources.Add(e);
module.Resources.Remove(x);
var services = module.Types.Where(t => t.Namespace == "Bit.Core.Services");
var type = services.First(t => t.Name == "LicensingService");
var licensingType = type.Resolve();
var existingCert = new X509Certificate2(x.GetResourceData());
Console.WriteLine($"Existing Cert Thumbprin: {existingCert.Thumbprint}");
X509Certificate2 certificate = new X509Certificate2(cert);
Console.WriteLine($"New cert Thumbprint: {certificate.Thumbprint}");
var ctor = licensingType.GetConstructors().Single();
var rewriter = ctor.Body.GetILProcessor();
var instToReplace =
ctor.Body.Instructions.Where(i => i.OpCode == OpCodes.Ldstr
&& string.Equals((string)i.Operand, existingCert.Thumbprint, StringComparison.InvariantCultureIgnoreCase))
.FirstOrDefault();
if(instToReplace != null) {
rewriter.Replace(instToReplace, Instruction.Create(OpCodes.Ldstr, certificate.Thumbprint));
}
else {
Console.WriteLine("Cant find inst");
}
// foreach (var inst in ctor.Body.Instructions)
// {
// Console.Write(inst.OpCode.Name + " " + inst.Operand?.GetType() + " = ");
// if(inst.OpCode.FlowControl == FlowControl.Call) {
// Console.WriteLine(inst.Operand);
// }
// else if(inst.OpCode == OpCodes.Ldstr) {
// Console.WriteLine(inst.Operand);
// }
// else {Console.WriteLine();}
// }
module.Write("modified.dll");
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return 0;
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}
}
}