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Lesson 1: Maintaining a Server-Level Security Strategy
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CREATE LOGIN
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You can use the Transact-SQL CREATE LOGIN statement to create user accounts and to specify whether password restrictions should apply. For example, CREATE LOGIN kim_akers WITH PASSWORD = 'password',CHECK_POLICY = OFF creates an account kim_akers with the weak password password. This applies only to SQL Server 2005 logins Kim would not be able to log in to a Windows 2003 domain by using this password unless password complexity rules were disabled. For more information, search Books Online for CREATE LOGIN or access msdn2.microsoft.com/en-us/library/ ms189751(d=ide).aspx.
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Determining Service Account Permissions
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Every process executed within a server requires a security context, which is a set of activities that can be performed by specifying a valid account (user name and password) for a computer running SQL Server 2005 and its associated services. Such accounts are known as service accounts. You can use service accounts to define the relationship between the service, the server, and the network. By defining service account permissions, you can create an environment in which you comply with both the principle of least privilege and the business requirements that the service is required to fulfill. Use the following guidelines for determining appropriate service account permissions:
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If you need the service to access network resources, you should create a domain user account to run the SQL Server service. Otherwise, you should define the service accounts by using a local account.
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For example, you should not run SQL Server 2005 under the context of the Local System account or the Network Service account. These accounts have more permissions than are required for SQL Server 2005 to run successfully.
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Apply the principle of least privilege
Isolating a service helps you reduce the potential attack area in the event that a service account is compromised. Also, if you use separate accounts, you can grant specific permissions to one service without extending the scope of other services that do not require the same level of permissions.
Create separate accounts for different services Create accounts with names that are not obvious
Do not, for example, create accounts with names such as SQLServiceAccount. Do not add them
Configure service accounts like any other regular user accounts
to high-privilege groups, such as Administrators.
Give service accounts long, complex passwords
Service account passwords are retrieved from encrypted storage and do not need to be typed in each time a
11
Security Strategies
service runs. They can therefore be longer and more complex than ordinary user account passwords.
Change the service account user name and password regularly
This is a tedious procedure because it involves reconfiguring the services that run under the context of the account. However, unless you use exceptionally long (30 characters or more) and complex passwords, you should change the account credentials to frustrate password-cracking attackers.
Run only required Windows services
BEST PRACTICES
The Windows operating system and SQL Server 2005 offer comprehensive toolsets, and you might not require all these tools and services for your SQL Server environment. In such cases, you must identify which Windows services are required for your SQL Server environment. You should not install services that are not required, and you should disable installed services you do not currently use. When a service is not installed or when you disable a service, a malicious user will not be able to use or exploit the service, thus reducing the attack surface of your servers.
Auditing Windows Account Permissions
Lesson 2 of this chapter, Maintaining a User-Level Security Strategy, discusses auditing the account policy and permissions applied to user accounts, the relationship between account permissions and server roles, and the use of the Resultant Set of Policy (RSoP) tool. However, service and application accounts are also user accounts. Their passwords are not typed in, but are instead retrieved from secure storage. You, or your domain administrator, need to create a service account for each service you enable. It is good practice to create a separate service account for each service, although a valid argument exists for running the SQL Server service and the SQL Server Agent service under the context of the same account. The SQL Server Agent service is discussed later in this lesson. You should record details of the services enabled, the service accounts created, and when the names and passwords in these accounts were last created in a secure encrypted file. You need to audit this information to ensure that the service accounts do not have more privileges than are required for the services to run, and that no service remains enabled when it is no longer required that is, disable the service account as well as its related service. You should audit the security log in each SQL Server 2005 server to ensure there is no suspicious activity for example, failed login attempts associated with your service accounts.
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