Hi,
I am wondering: are you currently able to connect to SAS on Linux with your IWA credentials (your current windows/ AD credentials)?
If not, I would suggest to configure this first (with PAM, as a good example), and the kerberos delegation (SPNs, the keypass file, etc), then you can move forward to configure the driver as indicated by @SASKiwi. Otherwise I doubt the SQL Server sill ever be able to get the AD credentials.
If yes, then you are on the right path from my point of view, and you can move forward to this configuration.
Besides, most part of the steps, are explained here: http://www.easysoft.com/products/data_access/odbc-sql-server-driver/kerberos.html
Regarding cost and licenses, we cannot help you, sorry.
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