public void Listen() { UdpClient reciever = new UdpClient(Config.AS_port); Console.WriteLine($"AS started on 127.0.0.1:{Config.AS_port}"); IPEndPoint remoteIP = null; try { while (true) { byte[] data = reciever.Receive(ref remoteIP); remoteIP.Port = Config.C_port; Message ReMessage = new Message(); var message = Serialiser <Message> .Deserialise(data); if (message.Type == MessageType.CToAs) { var id = Encoding.UTF8.GetString(message.Data[0].ToArray()); Console.WriteLine($"Message from {remoteIP.Address}:{remoteIP.Port} with c = {id} to AuthServer!"); if (Users.Contains(id)) { ReMessage.Type = MessageType.AsToC; TicketGranting ticket = new TicketGranting() { ClientIdentity = id, Duration = Config.ASTicketDuration.Ticks, IssuingTime = DateTime.Now, ServiceIdentity = Config.tgs, Key = Encoding.UTF8.GetString(Config.K_C_TGS) }; var ticket_bytes = Helper.ExtendData(Serialiser <TicketGranting> .Serialise(ticket)); var k_c_tgs_bytes = Helper.ExtendData(Config.K_C_TGS); var tb_enc = DES.Encrypt(ticket_bytes, Config.K_AS_TGS); tb_enc = DES.Encrypt(tb_enc, Config.K_C); var k_c_tgs_enc = DES.Encrypt(k_c_tgs_bytes, Config.K_C); ReMessage.Data.Add(new List <byte>(tb_enc)); ReMessage.Data.Add(new List <byte>(k_c_tgs_enc)); } else { ReMessage.Type = MessageType.AccessDenied; Console.WriteLine("AccessDenied in AS"); } ReMessage.Send(remoteIP); Console.WriteLine($"Message sended from AS to {remoteIP.Address}:{remoteIP.Port}!"); } } } catch (Exception ex) { Console.WriteLine(ex.Message); Console.WriteLine(ex.StackTrace); } }
public void Listen() { Console.WriteLine($"SS started on 127.0.0.1:{Config.SS_port}"); UdpClient reciever = new UdpClient(Config.SS_port); IPEndPoint remoteIP = null; try { while (true) { byte[] data = reciever.Receive(ref remoteIP); remoteIP.Port = Config.C_port; var message = Serialiser <Message> .Deserialise(data); Console.WriteLine(message.ToString() + $"from {remoteIP.Address}:{remoteIP.Port};"); if (message.Type == MessageType.CToSs) { var tgs_bytes = Helper.RecoverData( new List <byte>(DES.Decrypt(message.Data[0].ToArray(), Config.K_TGS_SS))); var tgs = Serialiser <TicketGranting> .Deserialise(tgs_bytes); var aut2_bytes = Helper.RecoverData( new List <byte>(DES.Decrypt(message.Data[1].ToArray(), Config.K_C_SS))); var aut2 = Serialiser <TimeMark> .Deserialise(aut2_bytes); Message ReMessage = new Message(); if (Helper.CheckTime(tgs.IssuingTime, aut2.T, tgs.Duration)) { ReMessage.Type = MessageType.SsToC; DateTime reTime = aut2.T; var time_bytes = Serialiser <long> .Serialise(aut2.T.Ticks + 1); var bytes = DES.Encrypt(Helper.ExtendData(time_bytes), Config.K_C_SS); ReMessage.Data.Add(new List <byte>(bytes)); } else { ReMessage.Type = MessageType.TicketNotValid; } ReMessage.Send(remoteIP); Console.WriteLine($"Message sended from SS to {remoteIP.Address}:{remoteIP.Port}"); } } } catch (Exception ex) { Console.WriteLine(ex.Message); Console.WriteLine(ex.StackTrace); } }
public void Listen() { UdpClient reciever = new UdpClient(Config.TGS_port); Console.WriteLine($"TGS started on 127.0.0.1:{Config.TGS_port}"); IPEndPoint remoteIP = null; try { while (true) { byte[] data = reciever.Receive(ref remoteIP); remoteIP.Port = Config.C_port; var message = Serialiser <Message> .Deserialise(data); if (message.Type == MessageType.Š”ToTgs) { var tgt_json = Helper.RecoverData( new List <byte>(DES.Decrypt(message.Data[0].ToArray(), Config.K_AS_TGS))); var tgt = Serialiser <TicketGranting> .Deserialise(tgt_json); var aut1_json = Helper.RecoverData( new List <byte>(DES.Decrypt(message.Data[1].ToArray(), Config.K_C_TGS))); var a = Encoding.UTF8.GetString(aut1_json); var aut1 = Serialiser <TimeMark> .Deserialise(aut1_json); var ID = Encoding.UTF8.GetString(message.Data[2].ToArray()); Message ReMessage = new Message(); if (tgt.ClientIdentity == aut1.C) { if (Helper.CheckTime(tgt.IssuingTime, aut1.T, tgt.Duration)) { ReMessage.Type = MessageType.TgsToC; var TGS = new TicketGranting() { ClientIdentity = aut1.C, ServiceIdentity = ID, Duration = Config.TGSTicketDuration.Ticks, IssuingTime = DateTime.Now, Key = Encoding.UTF8.GetString(Config.K_C_SS) }; var ticket_bytes = Helper.ExtendData(Serialiser <TicketGranting> .Serialise(TGS)); var k_c_ss_bytes = Helper.ExtendData(Config.K_C_SS); var tb_enc = DES.Encrypt(ticket_bytes, Config.K_TGS_SS); tb_enc = DES.Encrypt(tb_enc, Config.K_C_TGS); var k_c_ss_enc = DES.Encrypt(k_c_ss_bytes, Config.K_C_TGS); ReMessage.Data.Add(new List <byte>(tb_enc)); ReMessage.Data.Add(new List <byte>(k_c_ss_enc)); } else { ReMessage.Type = MessageType.TicketNotValid; Console.WriteLine("TicketNotValid in TGS;"); } } else { ReMessage.Type = MessageType.AccessDenied; Console.WriteLine("AccessDenied in TGS;"); } ReMessage.Send(remoteIP); Console.WriteLine($"Message sended from TGS to {remoteIP.Address}:{remoteIP.Port}!"); } } } catch (Exception ex) { Console.WriteLine(ex.Message); Console.WriteLine(ex.StackTrace); } }