public void RmiSend(IChannelHandlerContext ctx, short RmiID, RmiMessage message)
{
RmiMessage rmiframe = new RmiMessage();
rmiframe.Write(MessageType.Rmi);
rmiframe.Write(RmiID);
rmiframe.Write(message);
SendA(ctx, rmiframe);
}
public override void ChannelActive(IChannelHandlerContext context)
{
base.ChannelActive(context);
RmiMessage firstMessage = new RmiMessage();
firstMessage.Write(MessageType.Notify);
firstMessage.Write("<region>EU-S4L</region>");
SendA(context, firstMessage);
}
public void SendA(IChannelHandlerContext ctx, RmiMessage data)
{
RmiMessage coreframe = new RmiMessage();
coreframe.Write(Magic);
coreframe.WriteScalar(data.Length);
coreframe.Write(data);
IByteBuffer buffer = Unpooled.Buffer(coreframe.Length);
buffer.WriteBytes(coreframe.Buffer);
ctx.WriteAndFlushAsync(buffer);
}
public override void ChannelRead(IChannelHandlerContext context, object messageData)
{
var buffer = messageData as IByteBuffer;
byte[] data = buffer.ToArray();
RmiMessage __msg = new RmiMessage(data, data.Length);
short magic = 0;
ByteArray _message = new ByteArray();
if (__msg.Read(ref magic) &&
magic == Magic &&
__msg.Read(ref _message))
{
RmiMessage message = new RmiMessage(_message);
MessageType coreID = 0;
if (message.Read(ref coreID))
{
switch (coreID)
{
case MessageType.Rmi:
{
short RmiID = 0;
if (message.Read(ref RmiID))
{
switch (RmiID)
{
case 15:
{
AccountDto account;
string Username = "";
string Password = "";
bool register = false;
if (message.Read(ref Username) &&
message.Read(ref Password) &&
message.Read(ref register))
{
using (var db = AuthDatabase.Open())
{
Logger.Information("Authentication login from {endpoint}", context.Channel.RemoteAddress.ToString());
if (Username.Length > 5 && Password.Length > 5)
{
var result = db.Find <AccountDto>(statement => statement
.Where($"{nameof(AccountDto.Username):C} = @{nameof(Username)}")
.Include <BanDto>(join => join.LeftOuterJoin())
.WithParameters(new { Username }));
account = result.FirstOrDefault();
if (account == null)
{
account = new AccountDto {
Username = Username
};
var newSalt = new byte[24];
using (var csprng = new RNGCryptoServiceProvider())
csprng.GetBytes(newSalt);
var hash = new byte[24];
using (var pbkdf2 = new Rfc2898DeriveBytes(Password, newSalt, 24000))
hash = pbkdf2.GetBytes(24);
account.Password = Convert.ToBase64String(hash);
account.Salt = Convert.ToBase64String(newSalt);
db.InsertAsync(account);
}
var salt = Convert.FromBase64String(account.Salt);
var passwordGuess = new byte[24];
using (var pbkdf2 = new Rfc2898DeriveBytes(Password, salt, 24000))
passwordGuess = pbkdf2.GetBytes(24);
var actualPassword = Convert.FromBase64String(account.Password);
uint difference = (uint)passwordGuess.Length ^ (uint)actualPassword.Length;
for (var i = 0; i < passwordGuess.Length && i < actualPassword.Length; i++)
{
difference |= (uint)(passwordGuess[i] ^ actualPassword[i]);
}
if (difference != 0 || string.IsNullOrWhiteSpace(account.Password))
{
Logger.Error("Wrong authentication credentials for {username} / {endpoint}", Username, context.Channel.RemoteAddress.ToString());
RmiMessage ack = new RmiMessage();
ack.Write(false);
ack.Write("Login failed");
RmiSend(context, 16, ack);
}
else
{
account.LoginToken = AuthHash.GetHash256($"{context.Channel.RemoteAddress.ToString()}-{account.Username}-{account.Password}").ToLower();
account.LastLogin = $"{DateTimeOffset.Now}";
account.AuthToken = "";
account.newToken = "";
db.UpdateAsync(account);
RmiMessage ack = new RmiMessage();
ack.Write(true);
ack.Write(account.LoginToken);
RmiSend(context, 16, ack);
Logger.Information("Authentication success for {username}", Username);
}
}
else
{
Logger.Error("Wrong authentication credentials for {username} / {endpoint}", Username, context.Channel.RemoteAddress.ToString());
RmiMessage ack = new RmiMessage();
ack.Write(false);
ack.Write("Invalid length of username/password");
RmiSend(context, 16, ack);
}
}
}
else
{
Logger.Error("Wrong login for {endpoint}", context.Channel.RemoteAddress.ToString());
RmiMessage ack = new RmiMessage();
ack.Write(false);
ack.Write("Invalid loginpacket");
RmiSend(context, 16, ack);
}
break;
}
case 17:
context.CloseAsync();
break;
default:
Logger.Error("Received unknown rmiID{rmi} from {endpoint}", RmiID, context.Channel.RemoteAddress.ToString());
break;
}
}
break;
}
case MessageType.Notify:
{
string info = "";
message.Read(ref info);
Logger.Information("Received info! -> {received}", info);
break;
}
default:
Logger.Error("Received unknown coreID{coreid} from {endpoint}", coreID, context.Channel.RemoteAddress.ToString());
break;
}
}
}
else
{
Logger.Error("Received invalid packetstruct from {endpoint}", context.Channel.RemoteAddress.ToString());
context.CloseAsync();
}
}