Integrated auth in Firebird 2.1

Just a quick sample of integrated windows auth in Firebird 2.1
Logon to my Firebird server as a user with administrative privileges on the machine:

C:\Programmi\Firebird\Firebird_2_1\bin>isql localhost:employee
Database:  localhost:employee
SQL>

So I'm logged. let's check who am I for Firebird:

SQL> select current_user from rdb$database;

USER

===============================================================================

SYSDBA


SQL>

That's right, as an administrator on the machine, I'm SYSDBA on the database, now let's try with an unprivileged user I have on this machine:
I'll open another command line client as user postgres (guess what other database is installed on this machine?)

C:\Programmi\Firebird\Firebird_2_1\bin>runas /user:postgres cmd
Immettere la password per postgres:
Tentativo di avvio di cmd come utente "AB-2346789223445\postgres" ...

C:\Programmi\Firebird\Firebird_2_1\bin>

Now I have another command line window open

C:\Programmi\Firebird\Firebird_2_1\bin>isql localhost:employee
Database:  localhost:employee
SQL> select current_user from rdb$database;

USER

===============================================================================

AB-2346789223445\POSTGRES


SQL>

Ok, I'm in as postgres, let's try a select

SQL> select * from country;

COUNTRY         CURRENCY
=============== ==========
USA             Dollar
England         Pound
Canada          CdnDlr
Switzerland     SFranc
Japan           Yen
Italy           Lira
France          FFranc
Germany         D-Mark
Australia       ADollar
Hong Kong       HKDollar
Netherlands     Guilder
Belgium         BFranc
Austria         Schilling
Fiji            FDollar

SQL>

This works as expected, table country is available for SYSDBA and for PUBLIC, my current user is in PUBLIC by default.
Let's check a different table, on which PUBLIC has no grants

SQL> select * from tbl_stock_warehouse;
Statement failed, SQLCODE = -551
no permission for read/select access to TABLE TBL_STOCK_WAREHOUSE
SQL>

My request has been rejected as expected, great!
If this is not enough for you a lot of improvements in the user management area are currently in the works for Firebird 2.5 (Core 696 and CORE 1660) and in derived databases like RedSoft's one which will hopefully be merged in the official Firebird server.