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Which authentication mode is the default and recommended mode for security principals Windows authentication
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How to Configure SQL Server Logins
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Logins are the server principals that give users access to SQL Server. You can create SQL Server logins graphically in SSMS or by using the CREATE LOGIN statement. The basic CREATE LOGIN syntax to create a Windows login is
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CREATE LOGIN [Domain\User] FROM WINDOWS
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The syntax to create a SQL Server login is
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CREATE LOGIN login_name WITH PASSWORD='password'
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For SQL Server logins, you can specify the following options when creating the login:
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MUST_CHANGE The login should change the password at the next login. CHECK_EXPIRATION SQL Server will check the Windows expiration policy for the SQL Server login. CHECK_POLICY SQL Server will apply the local Windows password policy on SQL Server logins.
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2
Configuring SQL Server 2005
BEST PRACTICES
Password policies
To get a secure SQL Server environment, you should use the options to check the Windows expiration policy for SQL Server logins and apply the local Windows password policy on them.
In the following example, you create a SQL Server login and force checking of password expiration and password policy:
CREATE LOGIN secureSQL WITH PASSWORD='Ty%6tsfs$g23', CHECK_EXPIRATION=ON, CHECK_POLICY =ON
If you need to change any login property, you can use the ALTER LOGIN statement. The following example shows you how to change the password for a SQL Server login:
ALTER LOGIN login_name WITH PASSWORD='password'
You can disable a login by executing the following:
ALTER LOGIN login_name DISABLE
When you need to remove a login, you can use the DROP LOGIN statement:
DROP LOGIN login_name
Or use the following to drop a Windows login:
DROP LOGIN [Domain\User]
To get SQL Server login information such as state or login options, you can query the sys.sql_logins catalog view.
CAUTION
Removing logins
You cannot drop a login that owns any securable, server-level object, or SQL Server Agent job. You should disable logins before dropping them, and drop logins only when you are sure the action will not affect your environment. In addition, if the login is mapped to a database user and you drop the login, SQL Server does not automatically remove the user, resulting in an orphaned user.
DBAs commonly need to manage exceptions when providing access to a Windows group. For example, you might need to provide SQL Server access to all the members of a certain Windows group except for one member. To accomplish this task, you should create a Windows login for the Windows group and then deny access to the user who shouldn t receive access. The following example shows the basic syntax for accomplishing these steps:
CREATE LOGIN [domain_name\group_name] FROM WINDOWS DENY CONNECT SQL TO [domain_name\user_name]
Lesson 4: Configuring Server Security Principals
NOTE
Backward compatibility
You can use SQL Server 2000 stored procedures, such as sp_addlogin, sp_droplogin, and so on, to manage logins. But remember that these stored procedures are in SQL Server 2005 only for backward-compatibility purposes.
Managing Fixed Server Roles
SQL Server provides a set of fixed server roles, such as sysadmin and securityadmin, which you can use to assign and manage administrative privileges to logins by adding logins as members of these roles. Table 2-2 describes the fixed server roles for SQL Server 2005.
Table 2-2
SQL Server s Fixed Server Roles
Fixed Server Role sysadmin serveradmin setupadmin securityadmin processadmin dbcreator diskadmin bulkadmin
Members Can Perform any activity in SQL Server. The permissions of this role comprise the permissions of all other fixed server roles. Configure server-wide settings. Add and remove linked servers and execute some system stored procedures, such as sp_serveroption. Manage server logins. Manage processes running in an instance of SQL Server. Create and alter databases. Manage disk files. Execute the BULK INSERT statement.
To obtain information about logins for a fixed server role, you can query the sys.server_role_members catalog view, which returns a row for each member of the server role. The basic syntax for adding a login to a fixed server role is
EXECUTE sp_addsrvrolemember login_name, fixed_server_role
You can use the sp_dropsrvrolemember stored procedure to remove the login from the fixed server role.
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