/// <summary>
/// Loads a library into a foreign process and returns the module handle of the loaded library.
/// </summary>
private static IntPtr LoadLibraryInForeignProcess(ProcessWrapper processWrapper, string pathToDll)
{
LogMessage($"Trying to load \"{pathToDll}\" in process \"{processWrapper.Id}\"...");
if (File.Exists(pathToDll) == false)
{
throw new FileNotFoundException("Could not find file for loading in foreign process.", pathToDll);
}
var stringForRemoteProcess = pathToDll;
Trace.WriteLine(Marshal.GetLastWin32Error());
var bufLen = (stringForRemoteProcess.Length + 1) * Marshal.SizeOf(typeof(char));
var remoteAddress = NativeMethods.VirtualAllocEx(processWrapper.Handle, IntPtr.Zero, (uint)bufLen, NativeMethods.AllocationType.Commit, NativeMethods.MemoryProtection.ReadWrite);
if (remoteAddress == IntPtr.Zero)
{
throw new Win32Exception();
}
var address = Marshal.StringToHGlobalUni(stringForRemoteProcess);
var size = (uint)(sizeof(char) * stringForRemoteProcess.Length);
try
{
LogMessage($"Trying to write {size} bytes in foreign process");
var writeProcessMemoryResult = NativeMethods.WriteProcessMemory(processWrapper.Handle, remoteAddress, address, size, out var bytesWritten);
if (writeProcessMemoryResult == false ||
bytesWritten == 0)
{
throw Marshal.GetExceptionForHR(Marshal.GetLastWin32Error());
}
var hLibrary = NativeMethods.GetModuleHandle("kernel32");
// Load dll into the remote process
// (via CreateRemoteThread & LoadLibrary)
var procAddress = NativeMethods.GetProcAddress(hLibrary, "LoadLibraryW");
if (procAddress == UIntPtr.Zero)
{
LogMessage("Could get proc address for LoadLibraryW.");
throw new Win32Exception();
}
var remoteThread = NativeMethods.CreateRemoteThread(processWrapper.Handle,
IntPtr.Zero,
0,
procAddress,
remoteAddress,
0,
out _);
IntPtr moduleHandleInForeignProcess;
try
{
if (remoteThread == IntPtr.Zero)
{
LogMessage("Could not create remote thread.");
throw new Win32Exception();
}
else
{
NativeMethods.WaitForSingleObject(remoteThread);
// Get handle of the loaded module
if (NativeMethods.GetExitCodeThread(remoteThread, out moduleHandleInForeignProcess) == false)
{
throw new Win32Exception();
}
}
}
finally
{
NativeMethods.CloseHandle(remoteThread);
}
try
{
NativeMethods.VirtualFreeEx(processWrapper.Handle, remoteAddress, bufLen, NativeMethods.AllocationType.Release);
}
catch (Exception e)
{
LogMessage(e.ToString());
}
if (moduleHandleInForeignProcess == IntPtr.Zero)
{
throw new Exception($"Could not load \"{pathToDll}\" in process \"{processWrapper.Id}\".");
}
var remoteHandle = NativeMethods.GetRemoteModuleHandle(processWrapper.Process, Path.GetFileName(pathToDll));
LogMessage($"Successfully loaded \"{pathToDll}\" with handle \"{moduleHandleInForeignProcess}\" (\"{remoteHandle}\") in process \"{processWrapper.Id}\".");
return(remoteHandle);
}
finally
{
Marshal.FreeHGlobal(address);
}
}
public static void InjectIntoProcess(ProcessWrapper processWrapper, InjectorData injectorData)
{
InjectSnoop(processWrapper, injectorData);
}
private static void InjectSnoop(ProcessWrapper processWrapper, InjectorData injectorData)
{
var injectorDllName = $"Snoop.GenericInjector.{processWrapper.Bitness}.dll";
var pathToInjectorDll = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), injectorDllName);
LogMessage($"Trying to load \"{pathToInjectorDll}\"...");
if (File.Exists(pathToInjectorDll) == false)
{
throw new FileNotFoundException("Could not find injector dll.", pathToInjectorDll);
}
var parameters = new[]
{
processWrapper.SupportedFrameworkName,
injectorData.FullAssemblyPath,
injectorData.ClassName,
injectorData.MethodName,
injectorData.SettingsFile
};
var stringForRemoteProcess = string.Join("<|>", parameters);
var bufLen = (stringForRemoteProcess.Length + 1) * Marshal.SizeOf(typeof(char));
LogMessage($"Trying to allocate {bufLen} bytes in foreign process...");
Trace.WriteLine(Marshal.GetLastWin32Error());
var remoteAddress = NativeMethods.VirtualAllocEx(processWrapper.Handle, IntPtr.Zero, (uint)bufLen, NativeMethods.AllocationType.Commit | NativeMethods.AllocationType.Reserve, NativeMethods.MemoryProtection.ReadWrite);
if (remoteAddress == IntPtr.Zero)
{
throw new Win32Exception();
}
LogMessage("Successfully allocated memory in foreign process.");
var address = Marshal.StringToHGlobalUni(stringForRemoteProcess);
var size = (uint)(sizeof(char) * stringForRemoteProcess.Length);
try
{
var writeProcessMemoryResult = NativeMethods.WriteProcessMemory(processWrapper.Handle, remoteAddress, address, size, out var bytesWritten);
if (writeProcessMemoryResult == false ||
bytesWritten == 0)
{
throw Marshal.GetExceptionForHR(Marshal.GetLastWin32Error());
}
var hLibrary = IntPtr.Zero;
try
{
// Load library into current process before trying to get the remote proc address
hLibrary = NativeMethods.LoadLibrary(pathToInjectorDll);
// Load library into foreign process before invoking our method
var moduleHandleInForeignProcess = LoadLibraryInForeignProcess(processWrapper, pathToInjectorDll);
try
{
var remoteProcAddress = NativeMethods.GetRemoteProcAddress(processWrapper.Process, injectorDllName, "ExecuteInDefaultAppDomain");
if (remoteProcAddress == UIntPtr.Zero)
{
LogMessage("Could not get proc address for \"ExecuteInDefaultAppDomain\".");
return;
}
var remoteThread = NativeMethods.CreateRemoteThread(processWrapper.Handle, IntPtr.Zero, 0, remoteProcAddress, remoteAddress, 0, out _);
try
{
if (remoteThread == IntPtr.Zero)
{
LogMessage("Could not create remote thread.");
throw new Win32Exception();
}
NativeMethods.WaitForSingleObject(remoteThread);
// Get handle of the loaded module
NativeMethods.GetExitCodeThread(remoteThread, out var resultFromExecuteInDefaultAppDomain);
LogMessage($"Received \"{resultFromExecuteInDefaultAppDomain}\" from injector component.");
if (resultFromExecuteInDefaultAppDomain != IntPtr.Zero)
{
throw Marshal.GetExceptionForHR((int)resultFromExecuteInDefaultAppDomain.ToInt64());
}
}
finally
{
NativeMethods.CloseHandle(remoteThread);
}
}
finally
{
FreeLibraryInForeignProcess(processWrapper, injectorDllName, moduleHandleInForeignProcess);
}
}
finally
{
if (hLibrary != IntPtr.Zero)
{
NativeMethods.FreeLibrary(hLibrary);
}
try
{
NativeMethods.VirtualFreeEx(processWrapper.Handle, remoteAddress, bufLen, NativeMethods.AllocationType.Release);
}
catch (Exception e)
{
LogMessage(e.ToString());
}
}
}
finally
{
Marshal.FreeHGlobal(address);
}
}
public static void InjectIntoProcess(IntPtr windowHandle, InjectorData injectorData)
{
InjectIntoProcess(ProcessWrapper.FromWindowHandle(windowHandle), injectorData);
}
private static int Run(InjectorLauncherCommandLineOptions commandLineOptions)
{
Injector.LogMessage("Starting the injection process...", false);
try
{
if (commandLineOptions.Debug)
{
Debugger.Launch();
}
var processWrapper = ProcessWrapper.From(commandLineOptions.TargetPID, new IntPtr(commandLineOptions.TargetHwnd));
// Check for target process and our bitness.
// If they don't match we redirect everything to the appropriate injector launcher.
{
var currentProcess = Process.GetCurrentProcess();
var currentProcessBitness = ProcessWrapper.GetBitnessAsString(currentProcess);
if (processWrapper.Bitness.Equals(currentProcessBitness) == false)
{
Injector.LogMessage("Target process and injector process have different bitness, trying to redirect to secondary process...");
var originalProcessFileName = currentProcess.MainModule.ModuleName;
var correctBitnessFileName = originalProcessFileName.Replace(currentProcessBitness, processWrapper.Bitness);
var processStartInfo = new ProcessStartInfo(currentProcess.MainModule.FileName.Replace(originalProcessFileName, correctBitnessFileName), Parser.Default.FormatCommandLine(commandLineOptions))
{
CreateNoWindow = true,
WorkingDirectory = currentProcess.StartInfo.WorkingDirectory
};
using (var process = Process.Start(processStartInfo))
{
if (process == null)
{
Injector.LogMessage("Failed to start process for redirection.");
return(1);
}
process.WaitForExit();
return(process.ExitCode);
}
}
}
var settingsFile = string.IsNullOrEmpty(commandLineOptions.SettingsFile) == false
? commandLineOptions.SettingsFile
: new TransientSettingsData
{
StartTarget = SnoopStartTarget.SnoopUI,
TargetWindowHandle = processWrapper.WindowHandle.ToInt64()
}.WriteToFile();
var injectorData = new InjectorData
{
FullAssemblyPath = GetAssemblyPath(processWrapper, commandLineOptions.Assembly),
ClassName = commandLineOptions.ClassName,
MethodName = commandLineOptions.MethodName,
SettingsFile = settingsFile
};
Injector.LogMessage($"Start injecting \"{injectorData.FullAssemblyPath}\".");
if (File.Exists(injectorData.FullAssemblyPath) == false)
{
Injector.LogMessage($"Could not find \"{injectorData.FullAssemblyPath}\".");
return(1);
}
try
{
Injector.InjectIntoProcess(processWrapper, injectorData);
}
catch (Exception exception)
{
Injector.LogMessage($"Failed to inject Snoop into process {processWrapper.Process.ProcessName} (PID = {processWrapper.Process.Id})");
Injector.LogMessage(exception.ToString());
return(1);
}
Injector.LogMessage($"Successfully injected Snoop into process {processWrapper.Process.ProcessName} (PID = {processWrapper.Process.Id})");
return(0);
}
catch (Exception ex)
{
Injector.LogMessage(ex.ToString());
return(1);
}
}
