public override void ExecuteCommand(ShardSession session, ShardRequest request, ClientPacketHeader header)
{
int clientBuild = BitConverter.ToInt32(request.Packet, 6);
int identityLength;
string identity = Strings.FromNullTerminated(request.Packet, 14, Encoding.UTF8, out identityLength);
int clientSeed = BitConverter.ToInt32(request.Packet, 14 + identityLength + 1); // + 1 for null terminator
byte[] clientDigest = new byte[20];
Array.Copy(request.Packet, 14 + identityLength + 1 + 4, clientDigest, 0, 20);
log.DebugFormat("read {0} packet. client build = {1}, identity = {2}, client seed = {3:X}, packet size = {4}", header.Opcode, clientBuild, identity, clientSeed, request.Size);
int accountId = -1;
string sessionKey = null;
if (!session.Server.AuthDB.ExecuteQuery("select name, session_key, id from account where name = ? and enabled = true", identity, result =>
{
if (result.Read())
{
identity = result.GetString(0);
sessionKey = result.GetString(1);
accountId = result.GetInt32(2);
return(true);
}
return(false);
}))
{
// no identity match
log.DebugFormat("account {0} not found. sending {1} response", identity, AuthResponse.UnknownAccount);
session.Send(ShardServerOpcode.AuthResponse, (byte)AuthResponse.UnknownAccount);
return;
}
BigInteger sessionKeyInt = BigInteger.Parse(sessionKey, NumberStyles.AllowHexSpecifier);
// verify client/server identity and session key match
using (Digester sha1 = new Digester(new SHA1CryptoServiceProvider()))
{
byte[] serverDigest = sha1.CalculateDigest(new byte[][]
{
Encoding.UTF8.GetBytes(identity),
new byte[4],
BitConverter.GetBytes(clientSeed),
BitConverter.GetBytes(session.Seed),
Arrays.Left(sessionKeyInt.ToByteArray(), 40)
});
log.DebugFormat("client digest = {0}", Strings.HexOf(clientDigest));
log.DebugFormat("server digest = {0}", Strings.HexOf(serverDigest));
if (Arrays.AreEqual(clientDigest, serverDigest))
{
log.InfoFormat("client {0} successfully authenticated from {1}", identity, session.RemoteEndPoint.Address.ToString());
session.AccountID = accountId;
session.Status = SessionStatus.Authenticated;
session.InitializeCipher(sessionKeyInt);
using (ByteBuffer authPacket = new ByteBuffer())
{
authPacket.Append((byte)AuthResponse.Success);
authPacket.Append(0);
authPacket.Append((byte)0);
authPacket.Append(0);
session.Send(ShardServerOpcode.AuthResponse, authPacket);
}
using (ByteBuffer addonPacket = BuildAddonPacket(new ArraySegment <byte>(request.Packet, 14 + identityLength + 1 + 4 + 20, request.Size - (14 + identityLength + 1 + 4 + 20))))
session.Send(ShardServerOpcode.AddonInfo, addonPacket);
}
else
{
// digest mismatch
log.DebugFormat("client digest did not match server digest for account {0}. sending {1} response", identity, AuthResponse.Failed);
session.Send(ShardServerOpcode.AuthResponse, (byte)AuthResponse.Failed);
return;
}
}
}
