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07.06.2008 at 04:15PM PDT, ID: 23542123
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8.2

Can't do a gpg decrypt via C# ProcessStartInfo/Process (in windows service)

Asked by ElDoradoJim in Encryption for Network Security, Microsoft Visual C#.Net, Visual Studio

Tags: , ,

At first I was trying to call gpg directly using ProcessStartInfo, then changed that to calling a batch file, so that I could play with parameters without recompiling the windows service.
The strangest thing is, and this might be the tip-off to someone out there, is that the decryption process works in unit tests, and when running batch file straight from the command line.
The only time it DOESN'T work is when I'm trying to use it in my WINDOWS SERVICE.
Problem with threading?
Another interesting effect is that exceptions don't bubble up out of the Process.. the process just aborts, but nothing ever gets caught in any try..catch blocks.

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<gpg wrapper object>
    public string Decrypt(string encryptedFileIn, string passphrase)
    {
      string commandLineOptions = encryptedFileIn;
      ExternalProcess gpg = new ExternalProcess(_workDir + "\\decryptVAM.bat", commandLineOptions);
      gpg.WorkingDir = _workDir;
      _log.Debug("commandLineOptions = " + gpg.CommandLineOptions);
      string outStr = "";
      int exitCode = gpg.Execute("", out outStr);
      _log.Debug("exitcode=" + exitCode);
      if (exitCode != 0)
      {
        _log.Error("error= " + gpg.ErrorMessage);
        throw new GnuPGException(gpg.ErrorMessage);
      }
      return outStr;
    }
</gpg wrapper object>
<ExternalProcess object>
    [STAThread]
    public int Execute(string inputText, out string outputText)
    {
		  ProcessStartInfo pInfo = new ProcessStartInfo(_fileName, _cmdLineOptions);
      pInfo.WorkingDirectory = _workingDir;
      _log.Debug("filename=" + _fileName + "  options=" + _cmdLineOptions + "  workDir=" + _workingDir);
		  pInfo.CreateNoWindow = true;
		  pInfo.UseShellExecute = false;
		  // Redirect everything: 
		  // stdin to send the passphrase, stdout to get encrypted message, stderr in case of errors...
      pInfo.RedirectStandardInput = true;
      pInfo.RedirectStandardOutput = true;
      pInfo.RedirectStandardError = true;
		  _processObject = Process.Start(pInfo);
 
      // Send input text
      _processObject.StandardInput.Write(inputText);
      _processObject.StandardInput.Flush();
      _processObject.StandardInput.Close();
 
      _outputStr = "";
      _errorStr = "";
 
      // Create two threads to read both output/error streams without creating a deadlock
      ThreadStart outputEntry = StandardOutputReader;
      Thread outputThread = new Thread(outputEntry);
      outputThread.Start();
      ThreadStart errorEntry = StandardErrorReader;
      Thread errorThread = new Thread(errorEntry);
      errorThread.Start();
 
      if ( _processObject.WaitForExit(ProcessTimeOutMilliseconds) )
      {
        // Process exited before timeout...
        // Wait for the threads to complete reading output/error (but use a timeout!)
        if ( !outputThread.Join(ProcessTimeOutMilliseconds / 2) )
        {
          outputThread.Abort();
        }
        if ( !errorThread.Join(ProcessTimeOutMilliseconds / 2) )
        {
          errorThread.Abort();
        }
      }
      else
      {
        // Process timeout: PGP hung somewhere... kill it (as well as the threads!)
        _outputStr = "";
        _errorStr = "Timed out after " + ProcessTimeOutMilliseconds + " milliseconds";
        _processObject.Kill();
        if ( outputThread.IsAlive )
        {
          outputThread.Abort();
        }
        if ( errorThread.IsAlive )
        {
          errorThread.Abort();
        }
      }
 
		  // Check results and prepare output
		  _exitCode = _processObject.ExitCode;
      _log.Debug("exit code = " + ExitCode);
		  if (_exitCode == 0)
		  {
			  outputText = _outputStr;
		  }
		  else
		  {
		    outputText = "";
        if (outputThread.IsAlive) outputThread.Abort();
			  if (_errorStr == "")
			  {
				  _errorStr = "ExternalProcess: [" + _processObject.ExitCode + "]: Unknown error";
			  }
        _log.Debug(_errorStr);
        _log.Error(_errorStr);
        if (errorThread.IsAlive) errorThread.Abort();
			  //throw new Exception(_errorStr);
		  }
      return _exitCode;
	  }
</ExternalProcess object>
[+][-]07.06.2008 at 06:16PM PDT, ID: 21942256

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[+][-]07.06.2008 at 07:08PM PDT, ID: 21942431

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[+][-]07.06.2008 at 08:05PM PDT, ID: 21942563

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[+][-]07.07.2008 at 10:18AM PDT, ID: 21946847

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About this solution

Zones: Encryption for Network Security, Microsoft Visual C#.Net, Visual Studio
Tags: c#.net, gpg: encrypted with ELG-E key, ID ######### gpg: decryption failed: secret key not available, gpg decrypt ProcessStartInfo windows service
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Solution Provided By: ElDoradoJim
Participating Experts: 1
Solution Grade: A
 
 
 
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