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Schemas are new features in SQL Server 2005 that provide a means to group objects within a database together. In previous versions of SQL Server, objects were created by and owned by a database user. SQL Server 2005 introduces a schema between an object and a user. Database users now own a schema, and schemas own objects. This is a significant advance for managing objects within a database. If database users directly owned objects, it would not be possible to drop a user unless the objects were reassigned to a different owner. Reassigning an object to a different owner would change the name of the object. By introducing a schema between users
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Lesson 2: Designing Database Security
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and objects, you can drop a user from the database without affecting the name of an object or affecting applications. Permissions are granted on securables to principals. The principals available in SQL Server 2005 have already been discussed: logins, database users, roles, certificates, and asymmetric keys. In addition to having one or more owners, a schema is a secur able object that enables you to group multiple objects into a schema and then grant permissions to a principal to the schema. By granting permissions to the schema, the principal gains permissions to all objects owned by the schema. Schema design falls into two categories: naming and security. You could simply create all your objects in the default schema, dbo, but you would lose the ability to apply grouping and higher-level security structures. Most databases have natural boundaries for the data they contain. For example, the AdventureWorks database contains objects related to products, manufacturing pro cesses, employees, and customer orders. Within the AdventureWorks database, multi ple schemas were created, such as Person, Sales, HumanResources, Production, and Purchasing. These names enable a DBA to group database objects into functional areas within the business. The most powerful capability of schemas is to manage permissions. Users with the authority to read data related to employees can be granted permissions in two ways. You can grant select permissions to each object within the HumanResources schema or you can issue a single GRANT statement on the HumanResources schema. Although the ability to manage SELECT, INSERT, UPDATE, and DELETE permis sions is interesting, schemas provide more powerful security assignments. How would you grant a user the authority to manage objects only in the HumanResources schema without allowing the user to also grant permissions to another principal Members of the db_ddladmin and db_creator roles would have the authority to cre ate, alter, or delete objects in the HumanResources schema. However, members of those roles can also create, alter, and delete objects in any schema within the database, providing elevated permissions. By granting the CONTROL permission on the HumanResources schema, a user would have the authority to create, alter, and delete objects in the HumanResources schema, but could not create, alter, or delete objects in any other schema within the database. The CONTROL permission also grants the authority to assign permissions to another principal. Granting the ALTER permission on the HumanResources schema would allow the principal to create, alter, and delete any object in the HumanResources schema while not conferring permissions to any
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Designing Database Security
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other schema or the ability to grant permissions on the HumanResources schema.
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The ability to encrypt data within a database is a feature that has been requested for several years and is now available in SQL Server 2005. Encryption is accomplished by using a flexible, multilayered series of keys and ciphers that starts at the instance level and goes through data within the database.
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MORE INFO
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Encryption hierarchy
A diagram of the encryption hierarchy can be found in the Books Online topic, Encryption Hierarchy.
Service Master Key
The root of the encryption hierarchy is the service master key, which is automatically generated the first time a credential needs to be encrypted. Service master keys are derived from the Windows credentials of the SQL Server service account and encrypted using either the local machine key or the Windows Data Protection API. The generation and encryption process ensures that the service master key can be decrypted only by the service account under which it was created or by a principal with access to the service account credentials. Because the service master key is the root of the encryption hierarchy, if you were to restore a database containing encrypted data, the data could not be decrypted unless you also had access to the ser vice master key from the instance where the backup was created.
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