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The service accounts for a clustered instance are added to domain groups instead of local groups. This ensures that a valid security identifier (SID) exists for the service to fail over from one piece of hardware to another. For more information on SQL Server failover clustering and domain groups, please refer to 8, Failover Clustering.
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You do not need to change the default permissions assigned to these groups, which are sufficient to run SQL Server services out of the box. However, you need to closely monitor permissions. In fact, security is going to be the major issue that any database
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Lesson 1: Designing Instance-level Security
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administrator (DBA) will have to deal with. Of course, you could bypass having to think about security by running the services under an account with local administra tor authority, but that would violate security best practices. You need to understand the security context of each command you will execute. The most common example is executing a backup. A backup runs under the security con text of the SQL Server service. The Windows group of which the SQL Server service account is a member has been granted Read and Write permissions on the SQL Server installation directory, which includes the default backup directory. If you attempt to back up to a different location, you will receive an Access Denied error message. You should grant any additional permissions needed for processes to execute to the Windows group that contains the service account. By granting permissions to the Windows group, processes will not begin to fail because of security if you change the service account.
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Principals are entities that are granted permissions to a securable. At an instance level, principals are implemented as logins. To gain access to any object within a SQL Server instance, you must create a login inside the instance. Logins within SQL Server 2005 can be of five types:
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Standard SQL Server login Windows login Windows group Certificate Asymmetric key
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You create a standard SQL Server login entirely within SQL Server. The DBA specifies the name of the login along with the password. This login is stored inside the master database and is assigned a local SID within SQL Server. To use a standard SQL Server login, a user or application must specify the login and password for the account. You can map a SQL Server login to a Windows user account (login). The Windows login can be either a local account or a domain account. A SQL Server login created in this manner will store the SID for the Windows login. By mapping a Windows login to the SQL Server login, users or applications can log in directly to a SQL Server instance using the Windows credentials they use to access other network resources.
6
Designing Database Security
You can map a SQL Server login to a Windows group. The Windows group can be either a local group or a domain group. The SID of the Windows group will be stored in SQL Server. By mapping a Windows group to a SQL Server login, any member of the Windows group can gain access to SQL Server using their Windows credentials. Using Windows groups provides the greatest flexibility for managing security access because you simply add or remove accounts from the group to control access to a SQL Server instance. A DBA is also isolated from the details of people joining and leaving companies. The same processes that create/disable a user s Windows account can be used to add/remove an account from the group. You can then focus on defining groups based on permission profiles and leave the mechanics of adding/removing user accounts to standard business processes within your company. When a user logs in through a Windows group or a Windows login, the SID and other attributes of the user are validated by SQL Server making a call to the Windows secu rity application programming interface (API). Users do not need to have a separate password to access a SQL Server, and their account information is maintained in a central location. New in SQL Server 2005 is the capability to map a SQL Server login to either a certif icate or to an asymmetric key. Applications can then use the certificate or asymmetric key to gain access to SQL Server.
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