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A deprecated means of mapping a login to a user is with the sp_addalias system-stored procedure. Consider using the newer CREATE USER statement instead of sp_addalias in SSE solutions.
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This section drills down on techniques for granting database access to logins. You also learn about system-stored procedures that help you explore fixed database roles as well as the permissions associated with them. Finally, you learn how to add users to fixed database roles to assign the permissions for a role to a user. The samples for this section reside in AssigningFixedDataRoles.sql.
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Granting Database Access to Logins
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Perhaps the easiest way to enable a login without an associated database user to access a database is by enabling the database s guest user. SQL Server Express automatically makes the guest user available in all databases. Earlier versions of SQL Server required you to explicitly create the guest user and allowed you to drop the guest user. With SSE, the guest user is always available, and you cannot drop it. However, the guest user is disabled in new databases. Before using the guest user, you must enable it by executing the sp_adduser system-stored procedure for the guest user. You can disable, but not drop, the guest user with the sp_dropuser system-stored procedure for the guest user. The sqllogin1 login has been both created ( Creating SQL Server Logins section) and assigned to fixed server roles ( Assigning Permissions via the Fixed Server Roles section) earlier in this chapter. If you wish to run the samples in the Assigning Permissions via the Fixed Database Roles section, please run the earlier samples using the sqllogin1 login. Next, open SSE from the Windows administrator, sa, or another login in the sysadmin fixed server role. Then, run the following script to connect to the AdventureWorks database and confirm the login s ability to perform a SELECT statement for a table (i.e., ProductCategory) in the AdventureWorks database. USE AdventureWorks GO SELECT * FROM Production.ProductCategory GO
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CHAPTER 8 MANAGING SQL SERVER EXPRESS SECURITY
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Because you run the preceding script from a member of the sysadmin fixed server role, you can perform any task, including those specified by the preceding script, on a server instance. Not all logins have the same range of permissions. For example, the sqllogin1 login has significant permissions, as shown in earlier use in this chapter, such as the ability to define a new login and the ability to create a new database. In addition, the sqllogin1 login is the owner of the NewDB1 database, and you can therefore perform any task within the NewDB1 database after connecting to the server instance with the sqllogin1 login. However, the sqllogin1 login does not have permission to connect to the AdventureWorks database. Attempting to run the following script immediately after the preceding one generates an error precisely because the sqllogin1 login does not have permission to access the AdventureWorks database. EXECUTE AS login = 'sqllogin1' GO One way to allow the sqllogin1 login to connect to the AdventureWorks database is to enable the guest user within the AdventureWorks database. After enabling the guest user, the hasdbaccess column value for the guest user row in the sys.sysusers view changes from 0 to 1. In addition, the sqllogin1 login and any other login without an AdventureWorks user mapped to it can access the database. The following script performs tasks that demonstrate the impact that the sp_adduser systemstored procedure can have on the guest user and its ability to work with logins that have no user mapped explicitly to them. The script starts by wrapping an execution of the sp_adduser system-stored procedure between two SELECT statements. The sp_adduser statement enables the guest user. The first SELECT statement returns a result set showing the status of the users prior to the enabling of the guest user. The second SELECT statement returns a result set showing sys.sysusers after the enabling of the guest user. The EXECUTE AS login = 'sqllogin1' statement executes successfully because the sqllogin1 login can now connect to the AdventureWorks database. However, the SELECT statement from the ProductCategory table in the Production schema generates an error because the guest user does not have permission to perform any SELECT statements. The final batch with a REVERT statement restores the execution context of the initial login from the sysadmin fixed server role that you initially used to connect with the SSE instance. SELECT name, hasdbaccess, isntuser, issqluser FROM sys.sysusers WHERE issqlrole = 0 EXEC sp_adduser 'guest' SELECT name, hasdbaccess, isntuser, issqluser FROM sys.sysusers WHERE issqlrole = 0 --You can now connect
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