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SQL Server 2000 Stored Procedure Programming
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Access to the server does not provide the user with access to the database. An administrator has to assign a database to a login in one of the following manners:
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The administrator creates a database user that corresponds to the login in each database to which the user needs access. The administrator configures a database to treat a login/database user as a member of a database role. Such a user inherits all permissions from the role. The administrator sets a login to use one of the default user accounts: guest or database owner (dbo).
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Once access to a database has been granted, the user can see all database objects, because the object definitions are stored in system tables to which every user has read access.
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Permissions are the final level of SQL Server security. In order to have access to user-defined database objects, a user has to have permissions to perform actions on them. There are three types of permissions in SQL Server:
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Object permissions allow a user to read and change data and execute stored procedures. Statement permissions allow a user to create and manage database objects. Implied permissions allow members of fixed roles and owners of database objects to perform activities that are not part of the object or statement Permissions.
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Roles Users can be granted permissions individually or as members of a database role. Roles, introduced in Microsoft SQL Server 7.0, are equivalent to groups in Windows NT or roles in Microsoft Transaction Server. In earlier versions, a user could belong to only one SQL Server group. This restriction led to some pretty unrefined security solutions.
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11:
Interaction with the SQL Server Environment
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:
Stored Procedure User-Defined Function
Table
View
Column
Select Update Insert Delete Reference Execute
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:
w s s s s s v
Create Database Create Table Create View Create Default Create Rule Backup Database Backup Log
SQL Server 2000 Stored Procedure Programming
Implementing Security
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.
Selection of Security Model
You select a security model in the SQL Server Properties dialog box:
To open this dialog, select Tools | SQL Server Configuration Properties.
11:
Interaction with the SQL Server Environment
Managing Logins
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:
SQL Server 2000 Stored Procedure Programming
The Database Access tab controls the databases the user can access and the user s membership in roles:
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'
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