public void HandleLogonChallenge(ClientLogonChallengePacket packet, WoWClient sender)
{
Account account = Provider.FindAccount(packet.Identity);
if (account == null)
{
// reply with Server Logon Challenge
sender.Writer.Write((byte)0x0); // cmd, always 0
sender.Writer.Write((byte)0x0); // instant dc?
sender.Writer.Write((byte)AuthenticationResult.UnkAccount);
}
else if (account.Banned)
{
sender.Writer.Write((byte)0x0); // cmd, always 0
sender.Writer.Write((byte)0x0); // instant dc?
sender.Writer.Write((byte)AuthenticationResult.Banned);
}
else if (packet.Build != 5875) // only accept 1.12.1
{
sender.Writer.Write((byte)0x0); // cmd, always 0
sender.Writer.Write((byte)0x0); // instant dc?
sender.Writer.Write((byte)AuthenticationResult.WrongBuild);
}
else
{
// do SRP6 calculation and send back the server logon challenge, asking client for proof
/*
* uint8 cmd;
* uint8 error;
* uint8 unk2;
* uint8 B[32]; -- server's public value
* uint8 g_len; -- always 1
* uint8 g; -- 7
* uint8 N_len; -- always 32
* uint8 N[32]; -- always 0894B645E89E1535BBDAD5B8B290650530801B18EBFBF5E8FAB3C82872A3E9BB7 ;; joining the cool emu club
* uint8 s[32]; -- Salt, a random value
* uint8 unk3[16];
* uint8 unk4;
*/
SRP6 srp = new SRP6(account.Identity, account.Password);
sender.SRP = srp;
sender.Writer.Write((byte)0x0);
sender.Writer.Write((byte)AuthenticationResult.Succes);
sender.Writer.Write((byte)0x0);
sender.Writer.Write(srp.B.ToFixedByteArray().Pad(32));
sender.Writer.Write((byte)0x1); // todo: implement flexible generator
sender.Writer.Write((byte)0x7);
sender.Writer.Write((byte)32); // todo: implement flexible mod
sender.Writer.Write(srp.Modulus.ToFixedByteArray().Pad(32));
sender.Writer.Write(srp.Salt.ToFixedByteArray().Pad(32));
sender.Writer.Write(new byte[16]);
sender.Writer.Write((byte)0x0);
sender.Writer.Flush();
}
}