A little sample with Firebird 2.5

I added ordinary users 'user1' and 'user2' and admin user 'adm1'.
Now try to display list of users

1. Use sysdba account:

firebird\bin>gsec -user sysdba -pass masterkey -display
     user name                    uid   gid admin     full name
------------------------------------------------------------------------------------------------
SYSDBA                              0     0           Sql Server Administrator
USER1                               0     0
USER2                               0     0
ADM1                                0     0 admin

Of course, sysdba could see all users.
You see - adm1 is really admin user while user1 and user2 are not admins.


2. Ordinary users could see itself only:

firebird\bin>gsec -user user1 -pass u1 -display
     user name                    uid   gid admin     full name
------------------------------------------------------------------------------------------------
USER1                               0     0


3. What about non-sysdba admin ?

firebird\bin>gsec -user adm1 -pass adm1 -display
     user name                    uid   gid admin     full name
------------------------------------------------------------------------------------------------
ADM1                                0     0 admin

Something wrong ? Let see next sample


4. Specify admin role:

firebird\bin>gsec -user adm1 -pass adm1 -role rdb$admin -display
     user name                    uid   gid admin     full name
------------------------------------------------------------------------------------------------
SYSDBA                              0     0           Sql Server Administrator
USER1                               0     0
USER2                               0     0
ADM1                                0     0 admin

  Is it what you need ?

Regards,
Vlad