Exception StackTrace shows a method not in code!

Hi,

I see an exception and I try to relate the exception stack trace with the code, but as per the code, the top method in stack is not there in code! What am I not able to see here?

[Error] System.AggregateException: One or more errors occurred. (One or more errors occurred. (Access is denied) (Access is denied)) ---> System.AggregateException: One or more errors occurred. (Access is denied) (Access is denied) ---> System.Security.SecurityException: Access is denied
   at System.Security.Principal.WindowsIdentity.GetCurrentInternal(TokenAccessLevels desiredAccess, Boolean threadOnly)
   at Microsoft.Data.ProviderBase.DbConnectionPoolIdentity.GetCurrentNative()
   at Microsoft.Data.ProviderBase.DbConnectionPoolGroup.GetConnectionPool(DbConnectionFactory connectionFactory)
   at Microsoft.Data.ProviderBase.DbConnectionFactory.GetConnectionPool(DbConnection owningObject, DbConnectionPoolGroup connectionPoolGroup)
   at Microsoft.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
   at Microsoft.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   at Microsoft.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
   at Microsoft.Data.SqlClient.SqlConnection.OpenAsync(CancellationToken cancellationToken)

As per the source code https://github.com/dotnet/SqlClient/blob/master/src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/ProviderBase/DbConnectionPoolIdentity.Windows.cs, there is no call made to “WindowsIdentity.GetCurrentInternal”. Then why is the stack trace showing it?

I get this exception when I try to impersonate another person on my machine (which succeeds) but SQL Client is unable to open a connection.

Can anyone help?

TIA!

Nayan

[cheenamalhotra]

We call Windows.GetCurrent()

https://github.com/dotnet/SqlClient/blob/a9dfe480eff5dd344518eab5198654eff969fb6e/src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/ProviderBase/DbConnectionPoolIdentity.Windows.cs#L23

which calls GetCurrentInternal() by making a Sibling/Tail call, which is not captured by Stack Trace.

Reference source: windowsidentity.cs#L263-L267.

Regarding the exception, you might wanna try giving Security permission to the impersonated user account.

[cheenamalhotra]

Closing this issue as answered, if you need support on more topics from SqlClient, please open a new issue with repro attached.