/// <summary>
/// Checks the TDS version
/// </summary>
/// <param name="session">Server session</param>
/// <returns>Null if the TDS version is supported, errorToken message otherwise</returns>
protected virtual TDSMessageCollection CheckTDSVersion(ITDSServerSession session)
{
// Check if version is supported
if (TDSVersion.IsSupported(session.TDSVersion))
{
return(null);
}
// Prepare ERROR token
TDSErrorToken errorToken = new TDSErrorToken(12345, 1, 16, "Unsupported TDS client version", Arguments.ServerName);
// Log response
TDSUtilities.Log(Arguments.Log, "Response", errorToken);
// Create DONE token
TDSDoneToken doneToken = new TDSDoneToken(TDSDoneTokenStatusType.Final | TDSDoneTokenStatusType.Error);
// Log response
TDSUtilities.Log(Arguments.Log, "Response", doneToken);
// Wrap with message collection
return(new TDSMessageCollection(new TDSMessage(TDSMessageType.Response, errorToken, doneToken)));
}
/// <summary>
/// Handler for login request
/// </summary>
public virtual TDSMessageCollection OnLogin7Request(ITDSServerSession session, TDSMessage request)
{
// Inflate login7 request from the message
TDSLogin7Token loginRequest = request[0] as TDSLogin7Token;
// Log request
TDSUtilities.Log(Arguments.Log, "Request", loginRequest);
// Update server context
session.Database = string.IsNullOrEmpty(loginRequest.Database) ? "master" : loginRequest.Database;
// Resolve TDS version
session.TDSVersion = TDSVersion.Resolve(TDSVersion.GetTDSVersion(Arguments.ServerVersion), loginRequest.TDSVersion);
// Check for the TDS version
TDSMessageCollection collection = CheckTDSVersion(session);
// Check if any errors are posted
if (collection != null)
{
// Version check needs to send own message hence we can't proceed
return(collection);
}
// Indicates federated authentication
bool bIsFedAuthConnection = false;
// Federated authentication option to be used later
TDSLogin7FedAuthOptionToken federatedAuthenticationOption = null;
// Check if feature extension block is available
if (loginRequest.FeatureExt != null)
{
// Go over the feature extension data
foreach (TDSLogin7FeatureOptionToken option in loginRequest.FeatureExt)
{
// Check option type
switch (option.FeatureID)
{
case TDSFeatureID.SessionRecovery:
{
// Enable session recovery
session.IsSessionRecoveryEnabled = true;
// Cast to session state options
TDSLogin7SessionRecoveryOptionToken sessionStateOption = option as TDSLogin7SessionRecoveryOptionToken;
// Inflate session state
(session as GenericTDSServerSession).Inflate(sessionStateOption.Initial, sessionStateOption.Current);
break;
}
case TDSFeatureID.FederatedAuthentication:
{
// Cast to federated authentication option
federatedAuthenticationOption = option as TDSLogin7FedAuthOptionToken;
// Mark authentication as federated
bIsFedAuthConnection = true;
// Validate federated authentication option
collection = CheckFederatedAuthenticationOption(session, option as TDSLogin7FedAuthOptionToken);
if (collection != null)
{
// Version error happened.
return(collection);
}
// Save the fed auth library to be used
(session as GenericTDSServerSession).FederatedAuthenticationLibrary = federatedAuthenticationOption.Library;
break;
}
default:
{
// Do nothing
break;
}
}
}
}
// Check if SSPI authentication is requested
if (loginRequest.OptionalFlags2.IntegratedSecurity == TDSLogin7OptionalFlags2IntSecurity.On)
{
// Delegate to SSPI authentication
return(ContinueSSPIAuthentication(session, loginRequest.SSPI));
}
// If it is not a FedAuth connection or the server has been started up as not supporting FedAuth, just ignore the FeatureExtension
// Yes unfortunately for the fake server, supporting FedAuth = Requiring FedAuth
if (!bIsFedAuthConnection ||
Arguments.FedAuthRequiredPreLoginOption == TdsPreLoginFedAuthRequiredOption.FedAuthNotRequired)
{
// We use SQL authentication
session.SQLUserID = loginRequest.UserID;
// Process with the SQL login.
return(OnSqlAuthenticationCompleted(session));
}
else
{
// Fedauth feature extension is present and server has been started up as Requiring (or Supporting) FedAuth
if (federatedAuthenticationOption.IsRequestingAuthenticationInfo)
{
// Must provide client with more info before completing authentication
return(OnFederatedAuthenticationInfoRequest(session));
}
else
{
return(OnFederatedAuthenticationCompleted(session, federatedAuthenticationOption.Token));
}
}
}
