private void HandleLoginCommand(MasterControlClient session, RouterMessage msg)
{
//Get details
int loginId = BitConverter.ToInt16(msg.payload, 0);
byte[] loginKey = new byte[16];
Array.Copy(msg.payload, 2, loginKey, 0, 16);
//Search for a server
DeltaManagerServer server = null;
lock (Program.servers)
{
foreach (var s in Program.servers)
{
if (s.id == loginId)
{
//Authenticate key
if (BinaryTool.CompareBytes(s.key, loginKey))
{
server = s;
}
}
}
}
//Check if it was successful
if (server != null)
{
//Set
server.SetTransport(session);
session.authenticated = true;
//Log
logger.Log("HandleLoginCommand", $"Client {session.GetDebugName()} successfully logged in as server ID {server.id}.", DeltaLogLevel.Low);
}
else
{
//Failed
logger.Log("HandleLoginCommand", $"Client {session.GetDebugName()} attempted login, but failed.", DeltaLogLevel.Low);
}
}
/// <summary>
/// Reads the data encoded by the CreateSteamIdTokenString function
/// </summary>
/// <param name="encoded"></param>
public SteamIdToken ReadSteamIdTokenString(string encoded)
{
//Read as bytes
byte[] data;
try
{
data = Convert.FromBase64String(encoded);
} catch
{
return(null);
}
//Validate
if (data.Length < 16 + 1)
{
return(null);
}
//Read the hash
byte[] hash = new byte[16];
Array.Copy(data, 0, hash, 0, 16);
//Get the HMAC of this
steamTokenKey.CopyTo(data, 0);
byte[] challengeHash = new HMACMD5(steamTokenKey).ComputeHash(data);
//Validate
if (!BinaryTool.CompareBytes(hash, challengeHash))
{
return(null);
}
//Data OK! Read it now
return(new SteamIdToken
{
version = data[16],
steam_id = Encoding.ASCII.GetString(data, 17, data.Length - 17)
});
}
/// <summary>
/// Handles the first binary message we get. It will always be for authentication.
/// </summary>
/// <param name="data"></param>
/// <param name="length"></param>
/// <returns></returns>
private async Task HandleAuthentication(byte[] data, int length)
{
//This message follows the following format:
// 256 bytes: Authentication key
// 8 bytes: Program identification name
// 4 bytes: System version
//Verify
if (length != 256 + 8 + 4)
{
Log("AUTHENTICATION", "Authentication length mismatch!");
await DisconnectAsync(WebSocketCloseStatus.InvalidPayloadData, "DELTA_RPC_DISCONNECT_INVALID_AUTHENTICATION_PAYLOAD");
return;
}
//Extract info
byte[] key = BinaryTool.CopyFromArray(data, 0, 256);
program_identity = Encoding.ASCII.GetString(data, 256, 8);
version = BinaryTool.ReadInt32(data, 264);
//Validate the key
if (!BinaryTool.CompareBytes(Program.master_key, key))
{
authenticated = false;
Log("AUTHENTICATION", "Authentication failed!");
await DisconnectAsync(WebSocketCloseStatus.PolicyViolation, "DELTA_RPC_DISCONNECT_INVALID_AUTHENTICATION_KEY");
return;
}
//We're now ready for authentication!
authenticated = true;
Log("AUTHENTICATION", "Authentication OK!");
await WriteResponse(0, 0);
}
