/// <summary>
/// Handler for pre-login request
/// </summary>
public virtual TDSMessageCollection OnPreLoginRequest(ITDSServerSession session, TDSMessage request)
{
// Inflate pre-login request from the message
TDSPreLoginToken preLoginRequest = request[0] as TDSPreLoginToken;
// Log request
TDSUtilities.Log(Arguments.Log, "Request", preLoginRequest);
// Generate server response for encryption
TDSPreLoginTokenEncryptionType serverResponse = TDSUtilities.GetEncryptionResponse(preLoginRequest.Encryption, Arguments.Encryption);
// Update client state with encryption resolution
session.Encryption = TDSUtilities.ResolveEncryption(preLoginRequest.Encryption, serverResponse);
// Create TDS prelogin packet
TDSPreLoginToken preLoginToken = new TDSPreLoginToken(Arguments.ServerVersion, serverResponse, false); // TDS server doesn't support MARS
// Cache the recieved Nonce into the session
(session as GenericTDSServerSession).ClientNonce = preLoginRequest.Nonce;
// Check if the server has been started up as requiring FedAuth when choosing between SSPI and FedAuth
if (Arguments.FedAuthRequiredPreLoginOption == TdsPreLoginFedAuthRequiredOption.FedAuthRequired)
{
if (preLoginRequest.FedAuthRequired == TdsPreLoginFedAuthRequiredOption.FedAuthRequired)
{
// Set the FedAuthRequired option
preLoginToken.FedAuthRequired = TdsPreLoginFedAuthRequiredOption.FedAuthRequired;
}
// Keep the federated authentication required flag in the server session
(session as GenericTDSServerSession).FedAuthRequiredPreLoginServerResponse = preLoginToken.FedAuthRequired;
if (preLoginRequest.Nonce != null)
{
// Generate Server Nonce
preLoginToken.Nonce = _GenerateRandomBytes(32);
}
}
// Cache the server Nonce in a session
(session as GenericTDSServerSession).ServerNonce = preLoginToken.Nonce;
// Log response
TDSUtilities.Log(Arguments.Log, "Response", preLoginToken);
// Reset authentication information
session.SQLUserID = null;
session.NTUserAuthenticationContext = null;
// Respond with a single message that contains only one token
return(new TDSMessageCollection(new TDSMessage(TDSMessageType.Response, preLoginToken)));
}
