/// <summary>
/// Override the default Equals implementation.
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public override bool Equals(object obj)
{
if (obj == null)
{
return(false);
}
DbConnectionPoolAuthenticationContextKey otherKey = obj as DbConnectionPoolAuthenticationContextKey;
if (otherKey == null)
{
return(false);
}
return(String.Equals(StsAuthority, otherKey.StsAuthority, StringComparison.InvariantCultureIgnoreCase) &&
String.Equals(ServicePrincipalName, otherKey.ServicePrincipalName, StringComparison.InvariantCultureIgnoreCase));
}
/// <summary>
/// Generates (if appropriate) and sends a Federated Authentication Access token to the server, using the Federated Authentication Info.
/// </summary>
/// <param name="fedAuthInfo">Federated Authentication Info.</param>
internal void OnFedAuthInfo(SqlFedAuthInfo fedAuthInfo) {
Debug.Assert((ConnectionOptions.HasUserIdKeyword && ConnectionOptions.HasPasswordKeyword)
|| _credential != null
|| (ConnectionOptions.Authentication == SqlAuthenticationMethod.ActiveDirectoryIntegrated && _fedAuthRequired),
"Credentials aren't provided for calling ADAL");
Debug.Assert(fedAuthInfo != null, "info should not be null.");
Debug.Assert(_dbConnectionPoolAuthenticationContextKey == null, "_dbConnectionPoolAuthenticationContextKey should be null.");
Bid.Trace("<sc.SqlInternalConnectionTds.OnFedAuthInfo> %d#, Generating federated authentication token\n", ObjectID);
DbConnectionPoolAuthenticationContext dbConnectionPoolAuthenticationContext = null;
// We want to refresh the token without taking a lock on the context, allowed when the access token is expiring within the next 10 mins.
bool attemptRefreshTokenUnLocked = false;
// We want to refresh the token, if taking the lock on the authentication context is successful.
bool attemptRefreshTokenLocked = false;
// The Federated Authentication returned by TryGetFedAuthTokenLocked or GetFedAuthToken.
SqlFedAuthToken fedAuthToken = null;
if (_dbConnectionPool != null) {
Debug.Assert(_dbConnectionPool.AuthenticationContexts != null);
// Construct the dbAuthenticationContextKey with information from FedAuthInfo and store for later use, when inserting in to the token cache.
_dbConnectionPoolAuthenticationContextKey = new DbConnectionPoolAuthenticationContextKey(fedAuthInfo.stsurl, fedAuthInfo.spn);
// Try to retrieve the authentication context from the pool, if one does exist for this key.
if (_dbConnectionPool.AuthenticationContexts.TryGetValue(_dbConnectionPoolAuthenticationContextKey, out dbConnectionPoolAuthenticationContext)) {
Debug.Assert(dbConnectionPoolAuthenticationContext != null, "dbConnectionPoolAuthenticationContext should not be null.");
// The timespan between UTCNow and the token expiry.
TimeSpan contextValidity = dbConnectionPoolAuthenticationContext.ExpirationTime.Subtract(DateTime.UtcNow);
// If the authentication context is expiring within next 10 minutes, lets just re-create a token for this connection attempt.
// And on successful login, try to update the cache with the new token.
if (contextValidity <= _dbAuthenticationContextUnLockedRefreshTimeSpan) {
Bid.Trace("<sc.SqlInternalConnectionTds.OnFedAuthInfo> %d#, The expiration time is less than 10 mins, so trying to get new access token regardless of if an other thread is also trying to update it.The expiration time is %s. Current Time is %s.\n", ObjectID, dbConnectionPoolAuthenticationContext.ExpirationTime.ToLongTimeString(), DateTime.UtcNow.ToLongTimeString());
attemptRefreshTokenUnLocked = true;
}
#if DEBUG
// Checking if any failpoints are enabled.
else if (_forceExpiryUnLocked) {
attemptRefreshTokenUnLocked = true;
}
else if (_forceExpiryLocked) {
attemptRefreshTokenLocked = TryGetFedAuthTokenLocked(fedAuthInfo, dbConnectionPoolAuthenticationContext, out fedAuthToken);
}
#endif
// If the token is expiring within the next 45 mins, try to fetch a new token, if there is no thread already doing it.
// If a thread is already doing the refresh, just use the existing token in the cache and proceed.
else if (contextValidity <= _dbAuthenticationContextLockedRefreshTimeSpan) {
if (Bid.AdvancedOn) {
Bid.Trace("<sc.SqlInternalConnectionTds.OnFedAuthInfo> %d#, The authentication context needs a refresh.The expiration time is %s. Current Time is %s.\n", ObjectID, dbConnectionPoolAuthenticationContext.ExpirationTime.ToLongTimeString(), DateTime.UtcNow.ToLongTimeString());
}
// Call the function which tries to acquire a lock over the authentication context before trying to update.
// If the lock could not be obtained, it will return false, without attempting to fetch a new token.
attemptRefreshTokenLocked = TryGetFedAuthTokenLocked(fedAuthInfo, dbConnectionPoolAuthenticationContext, out fedAuthToken);
// If TryGetFedAuthTokenLocked returns true, it means lock was obtained and fedAuthToken should not be null.
// If there was an exception in retrieving the new token, TryGetFedAuthTokenLocked should have thrown, so we won't be here.
Debug.Assert(!attemptRefreshTokenLocked || fedAuthToken != null, "Either Lock should not have been obtained or fedAuthToken should not be null.");
Debug.Assert(!attemptRefreshTokenLocked || _newDbConnectionPoolAuthenticationContext != null, "Either Lock should not have been obtained or _newDbConnectionPoolAuthenticationContext should not be null.");
// Indicate in Bid Trace that we are successful with the update.
if (attemptRefreshTokenLocked) {
Bid.Trace("<sc.SqlInternalConnectionTds.OnFedAuthInfo> %d#, The attempt to get a new access token succeeded under the locked mode.");
}
}
else if (Bid.AdvancedOn) {
Bid.Trace("<sc.SqlInternalConnectionTds.OnFedAuthInfo> %d#, Found an authentication context in the cache that does not need a refresh at this time. Re-using the cached token.\n", ObjectID);
}
}
}
// dbConnectionPoolAuthenticationContext will be null if either this is the first connection attempt in the pool or pooling is disabled.
if (dbConnectionPoolAuthenticationContext == null || attemptRefreshTokenUnLocked) {
// Get the Federated Authentication Token.
fedAuthToken = GetFedAuthToken(fedAuthInfo);
Debug.Assert(fedAuthToken != null, "fedAuthToken should not be null.");
if (_dbConnectionPool != null) {
// GetFedAuthToken should have updated _newDbConnectionPoolAuthenticationContext.
Debug.Assert(_newDbConnectionPoolAuthenticationContext != null, "_newDbConnectionPoolAuthenticationContext should not be null.");
}
}
else if (!attemptRefreshTokenLocked) {
Debug.Assert(dbConnectionPoolAuthenticationContext != null, "dbConnectionPoolAuthenticationContext should not be null.");
Debug.Assert(fedAuthToken == null, "fedAuthToken should be null in this case.");
Debug.Assert(_newDbConnectionPoolAuthenticationContext == null, "_newDbConnectionPoolAuthenticationContext should be null.");
fedAuthToken = new SqlFedAuthToken();
// If the code flow is here, then we are re-using the context from the cache for this connection attempt and not
// generating a new access token on this thread.
fedAuthToken.accessToken = dbConnectionPoolAuthenticationContext.AccessToken;
}
Debug.Assert(fedAuthToken != null && fedAuthToken.accessToken != null, "fedAuthToken and fedAuthToken.accessToken cannot be null.");
_parser.SendFedAuthToken(fedAuthToken);
}