shell/Shell.cs at master · Bubbletill/shell · GitHub

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namespace BT_SHELL
{
    using System.Security.Cryptography;
    using System.Diagnostics;
    using System.Text;

    public partial class Shell : Form
    {

        private string passwordHash = "29297204E1506F949E0EEA8E2D935A8CEA64E09FF165445411B6FADBF4CA25BD890D8092856DEB179BB8A36714BBD10B5099E39EE705B6E9D910E6CB1E54A365";
        private Boolean canClose = false;
        private Process posProcess;

        public Shell()
        {
            InitializeComponent();
            posProcess = new Process();
            ProcessStartInfo startInfo = new ProcessStartInfo();
            posProcess.StartInfo = startInfo;
            startInfo.WindowStyle = ProcessWindowStyle.Hidden;
            startInfo.FileName = "C:\\bubbletill\\pos\\Bubbletill-POS.exe";
            posProcess.Start();
        }

        private void Shell_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (!canClose)
            {
                e.Cancel = true;
            }
        }

        private void Shell_KeyDown(object sender, KeyEventArgs e)
        {
            // Master login to escape the shell and launch explorer
            if ((e.Control && e.Shift && e.Alt) && e.KeyCode == Keys.X)
            {
                string inputPass = ShowDialog("Enter master password", "Authorization required");

                const string passSalt = "bubb13t1ll";
                const int passKeySize = 64;
                const int passIterations = 350000;

                HashAlgorithmName hashAlgorithm = HashAlgorithmName.SHA512;

                byte[] hashedInput = Rfc2898DeriveBytes.Pbkdf2(
                    Encoding.UTF8.GetBytes(inputPass),
                    Encoding.ASCII.GetBytes(passSalt),
                    passIterations,
                    hashAlgorithm,
                    passKeySize
                );

                string hashedInputStr = Convert.ToHexString(hashedInput);

                bool passwordOK = passwordHash == hashedInputStr;

                if (passwordOK == true)
                {
                    canClose = true;
                    Application.Exit();
                    Process.Start("C:\\Windows\\explorer.exe");
                }
            }

            // Restart the POS application
            if ((e.Control && e.Shift && e.Alt) && e.KeyCode == Keys.R)
            {
                DialogResult dialogResult = MessageBox.Show("Are you sure you want to restart the application?", "Confirm restart", MessageBoxButtons.YesNo);
                if (dialogResult == DialogResult.Yes)
                {
                    if (!posProcess.HasExited)
                    {
                        posProcess.Kill();
                    }
                    posProcess = new Process();
                    ProcessStartInfo startInfo = new ProcessStartInfo();
                    posProcess.StartInfo = startInfo;
                    startInfo.WindowStyle = ProcessWindowStyle.Hidden;
                    startInfo.FileName = "C:\\bubbletill\\pos\\Bubbletill-POS.exe";
                    posProcess.Start();
                }
            }
        }

        public static string ShowDialog(string text, string caption)
        {
            Form prompt = new Form()
            {
                Width = 500,
                Height = 150,
                FormBorderStyle = FormBorderStyle.FixedDialog,
                Text = caption,
                StartPosition = FormStartPosition.CenterScreen
            };
            Label textLabel = new Label() { Left = 50, Top = 20, Width = 400, Text = text };
            TextBox textBox = new TextBox() { Left = 50, Top = 50, Width = 400, UseSystemPasswordChar = true };
            Button confirmation = new Button() { Text = "Ok", Left = 350, Width = 100, Top = 70, DialogResult = DialogResult.OK };
            confirmation.Click += (sender, e) => { prompt.Close(); };
            prompt.Controls.Add(textBox);
            prompt.Controls.Add(confirmation);
            prompt.Controls.Add(textLabel);
            prompt.AcceptButton = confirmation;

            return prompt.ShowDialog() == DialogResult.OK ? textBox.Text : "";
        }
    }
}