private void UpdateClient() { while (Client.DataAvailable) { var packet = ClientStream.ReadPacket(Craft.Net.PacketDirection.Serverbound); Log.LogPacket(packet, true); if (packet is EncryptionKeyResponsePacket) { if (!FinializeClientEncryption((EncryptionKeyResponsePacket)packet)) { if (ConnectionClosed != null) { ConnectionClosed(this, null); } Worker.Abort(); return; } } else { var eventArgs = new IncomingPacketEventArgs(packet, true); if (IncomingPacket != null) { IncomingPacket(this, eventArgs); } lock (Server) { if (!eventArgs.Handled) { ServerStream.WritePacket(packet, Craft.Net.PacketDirection.Serverbound); } // We use a BufferedStream to make sure packets get sent in one piece, rather than // a field at a time. Flushing it here sends the assembled packet. Server.Flush(); } if (packet is DisconnectPacket) { Console.WriteLine("Client disconnected: " + ((DisconnectPacket)packet).Reason); if (ConnectionClosed != null) { ConnectionClosed(this, null); } Worker.Abort(); } } } }
private bool FinializeClientEncryption(EncryptionKeyResponsePacket encryptionKeyResponsePacket) { // Here, we need to prepare everything to enable client<->proxy // encryption, but we can't turn it on quite yet. if (Settings.AuthenticateClients) { // Do authentication // Create a hash for session verification AsnKeyBuilder.AsnMessage encodedKey = AsnKeyBuilder.PublicKeyToX509(ServerKey); byte[] shaData = Encoding.UTF8.GetBytes(ClientAuthenticationHash) .Concat(ClientSharedKey) .Concat(encodedKey.GetBytes()).ToArray(); string hash = Cryptography.JavaHexDigest(shaData); var client = new WebClient(); var result = client.DownloadString(string.Format("http://session.minecraft.net/game/checkserver.jsp?user={0}&serverId={1}", PlayerName, hash)); if (result != "YES") { Log.Write("Failed to authenticate " + PlayerName + "!"); ServerStream.WritePacket(new DisconnectPacket("Failed to authenticate!"), Craft.Net.PacketDirection.Serverbound); ClientStream.WritePacket(new DisconnectPacket("Failed to authenticate!"), Craft.Net.PacketDirection.Clientbound); Server.Flush(); Client.Flush(); return(false); } } // Send unencrypted response ServerStream.WritePacket(ServerEncryptionResponse, Craft.Net.PacketDirection.Serverbound); Server.Flush(); // We wait for the server to respond, then set up encryption // for both sides of the connection. ServerStream.BaseStream = new AesStream(Server, ServerSharedKey); return(true); }