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Security is a huge topic that affects almost every action of every SQL Server user, including administrators and developers, and it deserves an entire book of its own. However, some areas of the SQL Server security framework are crucial to understanding how to work with a database or with any objects in a SQL Server database, so I can t leave the topic completely untouched in this book. SQL Server manages a hierarchical collection of entities. The most prominent of these entities are the server and databases in the server. Underneath the database level are objects. Each of these entities below the server level is owned by individuals or groups of individuals. The SQL Server security framework controls access to the entities within a SQL Server instance. Like any resource manager, the SQL Server security model has two parts: authentication and authorization. Authentication is the process by which the SQL Server validates and establishes the identity of an individual who wants to access a resource. Authorization is the process by which SQL Server decides whether a given identity is allowed to access a resource. In this section, I ll discuss the basic issues of database access and then describe the metadata where information on database access is stored. I ll also tell you about the concept of schemas and describe how they are used to access objects. The following two terms now form the foundation for describing security control in SQL Server 2008:

6. While still working in the Items Collection Editor, from the Select Item and Add to List Below drop-down list on the left, select MenuItem, and then click the Add button. Change the control s properties using the values shown in Table 9-3. Property (Name) ForeColor Text

with ad hoc modifications The Web model focuses on the information being transferred as opposed to the data transaction rules that are typical of a conventional EDI interaction By using these four models, XML/EDI developers can build an infrastructure for a wide variety of B2B systems Rather than a limited EDI system, developers can use XML to build flexible and open systems that will scale-up to meet the needs of tomorrow s business opportunities By adapting to the individual needs of the developer and the corporation for EDI solutions, XML applications allow for uniform systems and interoperable transactions

Securable A securable is an entity on which permissions can be granted. Securables include databases, schemas, and objects. Principal A principal is an entity that can access securables. A primary principal represents a single user (such as a SQL Server login or a Windows login); a secondary principal represents multiple users (such as a role or a Windows group).

Authentication is performed at two different levels in SQL Server. First, anyone who wants to access any SQL Server resource must be authenticated at the server level. SQL Server 2008 security provides two basic methods for authenticating logins: Windows Authentication and SQL Server Authentication. In Windows Authentication, SQL Server login security is integrated directly with Windows security, allowing the operating system to authenticate SQL Server users. In SQL Server Authentication, an administrator creates SQL Server login accounts within SQL Server, and any user connecting to SQL Server must supply a valid SQL Server login name and password.

3

Windows Authentication uses trusted connections, which rely on the impersonation feature of Windows Through impersonation, SQL Server can take on the security context of the Windows user account initiating the connection and test whether the SID has a valid privilege level Windows impersonation and trusted connections are supported by any of the available network libraries when connecting to SQL Server Under Windows Server 2003 and Windows Server 2008, SQL Server can use Kerberos to support mutual authentication between the client and the server, as well as to pass a client s security credentials between computers so that work on a remote server can proceed using the credentials of the impersonated client With Windows Server 2003 and Windows Server 2008, SQL Server uses Kerberos and delegation to support Windows authentication as well as SQL Server authentication The authentication method (or methods) used by SQL Server is determined by its security mode.

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SQL Server can run in one of two security modes: Windows Authentication mode (which uses only Windows authentication) and Mixed mode (which can use either Windows authentication or SQL Server authentication, as chosen by the client) When you connect to an instance of SQL Server con gured for Windows Authentication mode, you cannot supply a SQL Server login name, and your Windows user name determines your level of access to SQL Server One advantage of Windows authentication has always been that it allows SQL Server to take advantage of the security features of the operating system, such as password encryption, password aging, and minimum and maximum length restrictions on passwords When running on Windows Server 2003 or Windows Server 2008, SQL Server authentication can also take advantage of Windows password policies Take a look at the ALTER LOGIN command in SQL Server Books Online for the full details.