private static async Task ExecuteCommand(string mode, string command, string commandID, string senderConnectionID)
{
if (!IsServerVerified)
{
Logger.Write($"Command attempted before server was verified. Mode: {mode}. Command: {command}. Sender: {senderConnectionID}");
Uninstaller.UninstallAgent();
return;
}
try
{
switch (mode.ToLower())
{
case "pscore":
{
var psCoreResult = PSCore.GetCurrent(senderConnectionID).WriteInput(command, commandID);
var serializedResult = JsonConvert.SerializeObject(psCoreResult);
if (Encoding.UTF8.GetBytes(serializedResult).Length > 400000)
{
SendResultsViaAjax("PSCore", psCoreResult);
await HubConnection.InvokeAsync("PSCoreResultViaAjax", commandID);
}
else
{
await HubConnection.InvokeAsync("PSCoreResult", psCoreResult);
}
break;
}
case "winps":
if (OSUtils.IsWindows)
{
var result = WindowsPS.GetCurrent(senderConnectionID).WriteInput(command, commandID);
var serializedResult = JsonConvert.SerializeObject(result);
if (Encoding.UTF8.GetBytes(serializedResult).Length > 400000)
{
SendResultsViaAjax("WinPS", result);
await HubConnection.InvokeAsync("WinPSResultViaAjax", commandID);
}
else
{
await HubConnection.InvokeAsync("CommandResult", result);
}
}
break;
case "cmd":
if (OSUtils.IsWindows)
{
var result = CMD.GetCurrent(senderConnectionID).WriteInput(command, commandID);
var serializedResult = JsonConvert.SerializeObject(result);
if (Encoding.UTF8.GetBytes(serializedResult).Length > 400000)
{
SendResultsViaAjax("CMD", result);
await HubConnection.InvokeAsync("CMDResultViaAjax", commandID);
}
else
{
await HubConnection.InvokeAsync("CommandResult", result);
}
}
break;
case "bash":
if (OSUtils.IsLinux)
{
var result = Bash.GetCurrent(senderConnectionID).WriteInput(command, commandID);
var serializedResult = JsonConvert.SerializeObject(result);
if (Encoding.UTF8.GetBytes(serializedResult).Length > 400000)
{
SendResultsViaAjax("Bash", result);
}
else
{
await HubConnection.InvokeAsync("CommandResult", result);
}
}
break;
default:
break;
}
}
catch (Exception ex)
{
Logger.Write(ex);
await HubConnection.InvokeAsync("DisplayConsoleMessage", $"There was an error executing the command. It has been logged on the client device.", senderConnectionID);
}
}
private static void RegisterMessageHandlers(HubConnection hubConnection)
{
hubConnection.On("ExecuteCommand", (async(string mode, string command, string commandID, string senderConnectionID) =>
{
await ExecuteCommand(mode, command, commandID, senderConnectionID);
}));
hubConnection.On("TransferFiles", async(string transferID, List <string> fileIDs, string requesterID) =>
{
Logger.Write($"File transfer started by {requesterID}.");
var connectionInfo = Utilities.GetConnectionInfo();
var sharedFilePath = Directory.CreateDirectory(Path.Combine(Path.GetTempPath(), "RemotelySharedFiles")).FullName;
foreach (var fileID in fileIDs)
{
var url = $"{connectionInfo.Host}/API/FileSharing/{fileID}";
var wr = WebRequest.CreateHttp(url);
var response = await wr.GetResponseAsync();
var cd = response.Headers["Content-Disposition"];
var filename = cd
.Split(";")
.FirstOrDefault(x => x.Trim()
.StartsWith("filename"))
.Split("=")[1];
var legalChars = filename.ToCharArray().Where(x => !Path.GetInvalidFileNameChars().Any(y => x == y));
filename = new string(legalChars.ToArray());
using (var rs = response.GetResponseStream())
{
using (var fs = new FileStream(Path.Combine(sharedFilePath, filename), FileMode.Create))
{
rs.CopyTo(fs);
}
}
}
await HubConnection.InvokeAsync("TransferCompleted", transferID, requesterID);
});
hubConnection.On("DeployScript", async(string mode, string fileID, string commandContextID, string requesterID) => {
var connectionInfo = Utilities.GetConnectionInfo();
var sharedFilePath = Directory.CreateDirectory(Path.Combine(
Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData),
"Remotely",
"SharedFiles"
)).FullName;
var webClient = new WebClient();
var url = $"{connectionInfo.Host}/API/FileSharing/{fileID}";
var wr = WebRequest.CreateHttp(url);
var response = await wr.GetResponseAsync();
var cd = response.Headers["Content-Disposition"];
var filename = cd.Split(";").FirstOrDefault(x => x.Trim().StartsWith("filename")).Split("=")[1];
using (var rs = response.GetResponseStream())
{
using (var sr = new StreamReader(rs))
{
var result = await sr.ReadToEndAsync();
await ExecuteCommand(mode, result, commandContextID, requesterID);
}
}
});
hubConnection.On("UninstallClient", () =>
{
Uninstaller.UninstallAgent();
});
hubConnection.On("RemoteControl", async(string requesterID, string serviceID) =>
{
if (!IsServerVerified)
{
Logger.Write("Remote control attempted before server was verified.");
Uninstaller.UninstallAgent();
return;
}
try
{
var rcBinaryPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "ScreenCast", OSUtils.ScreenCastExecutableFileName);
if (!File.Exists(rcBinaryPath))
{
await hubConnection.InvokeAsync("DisplayConsoleMessage", "Remote control executable not found on target device.", requesterID);
return;
}
// Start ScreenCast.
await hubConnection.InvokeAsync("DisplayConsoleMessage", $"Starting remote control...", requesterID);
if (OSUtils.IsWindows)
{
if (Program.IsDebug)
{
Process.Start(rcBinaryPath, $"-mode Unattended -requester {requesterID} -serviceid {serviceID} -host {Utilities.GetConnectionInfo().Host} -desktop default");
}
else
{
var result = Win32Interop.OpenInteractiveProcess(rcBinaryPath + $" -mode Unattended -requester {requesterID} -serviceid {serviceID} -host {Utilities.GetConnectionInfo().Host} -desktop default", "default", true, out _);
if (!result)
{
await hubConnection.InvokeAsync("DisplayConsoleMessage", "Remote control failed to start on target device.", requesterID);
}
}
}
else if (OSUtils.IsLinux)
{
var users = OSUtils.StartProcessWithResults("users", "");
var username = users?.Split()?.FirstOrDefault()?.Trim();
var homeDir = OSUtils.StartProcessWithResults("sudo", $"-u {username} env | grep HOME")?.Split('=')?.Last();
var psi = new ProcessStartInfo()
{
FileName = "sudo",
Arguments = $"-u {username} {rcBinaryPath} -mode Unattended -requester {requesterID} -serviceid {serviceID} -host {Utilities.GetConnectionInfo().Host} -desktop default & disown"
};
psi.Environment.Add("DISPLAY", ":0");
psi.Environment.Add("XAUTHORITY", $"{homeDir}/.Xauthority");
var casterProc = Process.Start(psi);
casterProc.WaitForExit();
}
}
catch (Exception ex)
{
Logger.Write(ex);
await hubConnection.InvokeAsync("DisplayConsoleMessage", "Remote control failed to start on target device.", requesterID);
throw;
}
});
hubConnection.On("RestartScreenCaster", async(List <string> viewerIDs, string serviceID, string requesterID) =>
{
if (!IsServerVerified)
{
Logger.Write("Remote control attempted before server was verified.");
Uninstaller.UninstallAgent();
return;
}
try
{
var rcBinaryPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "ScreenCast", OSUtils.ScreenCastExecutableFileName);
// Start ScreenCast.
if (OSUtils.IsWindows)
{
if (Program.IsDebug)
{
Process.Start(rcBinaryPath, $"-mode Unattended -requester {requesterID} -serviceid {serviceID} -host {Utilities.GetConnectionInfo().Host} -relaunch true -desktop default -viewers {String.Join(",", viewerIDs)}");
}
else
{
var result = Win32Interop.OpenInteractiveProcess(rcBinaryPath + $" -mode Unattended -requester {requesterID} -serviceid {serviceID} -host {Utilities.GetConnectionInfo().Host} -relaunch true -desktop default -viewers {String.Join(",", viewerIDs)}", "default", true, out _);
if (!result)
{
Logger.Write("Failed to relaunch screen caster.");
await hubConnection.InvokeAsync("SendConnectionFailedToViewers", viewerIDs);
await hubConnection.InvokeAsync("DisplayConsoleMessage", "Remote control failed to start on target device.", requesterID);
}
}
}
else if (OSUtils.IsLinux)
{
var users = OSUtils.StartProcessWithResults("users", "");
var username = users?.Split()?.FirstOrDefault()?.Trim();
var homeDir = OSUtils.StartProcessWithResults("sudo", $"-u {username} env | grep HOME")?.Split('=')?.Last();
var psi = new ProcessStartInfo()
{
FileName = "sudo",
Arguments = $"-u {username} {rcBinaryPath} -mode Unattended -requester {requesterID} -serviceid {serviceID} -host {Utilities.GetConnectionInfo().Host} -relaunch true -desktop default -viewers {String.Join(",", viewerIDs)} & disown"
};
psi.Environment.Add("DISPLAY", ":0");
psi.Environment.Add("XAUTHORITY", $"{homeDir}/.Xauthority");
var casterProc = Process.Start(psi);
casterProc.WaitForExit();
}
}
catch (Exception ex)
{
await hubConnection.InvokeAsync("SendConnectionFailedToViewers", viewerIDs);
Logger.Write(ex);
throw;
}
});
hubConnection.On("CtrlAltDel", () =>
{
User32.SendSAS(false);
});
hubConnection.On("ServerVerificationToken", (string verificationToken) =>
{
if (verificationToken == Utilities.GetConnectionInfo().ServerVerificationToken)
{
IsServerVerified = true;
if (!Program.IsDebug)
{
Updater.CheckForCoreUpdates();
}
}
else
{
Logger.Write($"Server sent an incorrect verification token. Token Sent: {verificationToken}.");
Uninstaller.UninstallAgent();
return;
}
});
}
