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A user can now be a member of many database roles. Therefore, roles can be created to provide sophisticated access to needed functionality and information. Object Permissions The following table indicates which object permissions are applicable to which database objects:

Another possibility is to replace a single quote char(39) with a character that looks similar onscreen but that is stored under a different code, such as (`) char(96). Naturally, you have to make this substitution for all text boxes (on both data entry and search pages). In some organizations, this substitution might be inappropriate, since existing databases may already contain quotes.

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Database users can be given Select, Update, Insert, and Delete permissions to tables and views. This access level means that the user can read, write, delete, or change data in the respective tables or views. Reference permission allows a user to use a foreign key constraint to validate an entry to a column or table. Permissions to select, update, and reference can also be handled at the column level. To access a stored procedure or a user-defined function, a user has to have Execute permission on it. Statement Permissions Database users can be granted the following permissions to create and manage other databases or database objects:

You can implement a security solution using Enterprise Manager or system and extended stored procedures. Security stored procedures can also be used to manage security or implement some additional security features from a client application.

You select a security model in the SQL Server Properties dialog box:

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To create a login, expand the Security branch of the SQL Server in Enterprise Manager, then right-click Logins and select New Login from the pop-up menu. To manage an existing login, right-click the login in the list pane and select Properties from the pop-up menu. The application opens the SQL Server Login Properties dialog box to enable you to manage login properties. You can select a name and type of login, password, default database and language, and membership in Server Roles:

The Database Access tab controls the databases the user can access and the user s membership in roles:

You are at risk not only when you are passing strings directly from a GUI into the stored procedure that is assembling a query, but also when an application is reading the field with injected SQL into a variable that will be used in a dynamic query. A user might attempt to weaken security with some administrative procedure there is no need for direct interaction with the code by the attacker. Therefore, you should convert all string input parameters and local variables that are participating in the dynamic assembly of the query.

You can also grant logins using stored procedures. You can use sp_grantlogin to create a login on SQL Server. To give a Windows user access to a SQL Server, only the name of the user is required as a parameter:

exec sp_grantlogin 'Accounting\TomB'

However, when you create a login for SQL Server, you usually specify an authentication password and a default database as well:

exec sp_grantlogin 'TomB', 'password', 'Asset'

As we have shown, database access can be granted to a login during the login s creation. There is also a way to grant access to additional databases after the login has been created. Database users can be

1:

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You also might want to prevent users from injecting special characters (such as wild cards) into strings that will be used in Like searches. The following function will make a string parameter safe for use in dynamic queries:

managed from the Users node of a database in Enterprise Manager. You can both manage existing users and create new users. Login names have to be selected from the list box. The User Name is set by default to the name of the login. This default is not required, but it simplifies user management. In the Database Role Membership section, you check all databases to which you want to grant the user membership:

You can perform the same operation from Transact-SQL. To grant access to the database, use sp_grantdbaccess:

exec sp_grantdbaccess 'TomB', 'TomB'

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