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ALTER LOGIN [NewLogin] WITH CHECK_POLICY = OFF GO ALTER LOGIN [NewLogin] WITH CHECK_POLICY = ON GO
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Note that with the second approach, you will lose any password history for the login See the full syntax of the ALTER LOGIN statement in SQL Server Books Online for full details of the operations that can be performed on a login The following catalog views can be used to return details of logins created for an instance: sysserver_principals Returns general information, including that speci ed when the login was created, as previously described syssql_logins Inherits the columns of sysserver_principals and adds columns speci c only to SQL Server logins: is_policy_checked, is_expiration_checked, and password_hash
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A role is a named group of permissions that can represent common tasks or the actions associated with particular jobs A role can be assigned to users or applications as a single unit, reducing the management overhead of granting commonly used sets of permissions In SQL Server, roles exist at an instance level and at a database level If you want to assign a role s permissions to a user or application, you need to make the relevant login a member of the required role The prebuilt instance (or server) roles are described in Table 5-2 These roles cannot be modified or dropped, and you cannot create additional server roles The sysadmin fixed server role has the highest level of privilege and can access any database and carry out any action on any object or any data; as such, logins should only be added to this role after careful consideration Every SQL Server login belongs to the public server role Where a login is required to work with database objects and data only (as is usually the case for applications and non-admin users), the login should remain a member of this role only Viewing Role Membership and Permissions As shown in Figure 5-3, you can view the membership for a server role from the Properties dialog box of the role in question (by clicking Properties in the context menu of the Roles node in Object Explorer)
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sysadmin serveradmin setupadmin securityadmin processadmin dbcreator diskadmin bulkadmin public Table 5-2
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System Administrator Server Administrator Setup Administrator Security Administrator Process Administrator Database Administrator Disk Administrator Bulk Insert Administrator Public
Description
Can perform any activity in SQL Server The permissions of this role span all of the other fixed server roles Can configure instance-wide settings Can add and remove linked servers and execute some system stored procedures Can create and manage logins Can manage processes running in an instance of SQL Server Can create and alter databases Can manage physical database files Can execute the BULK INSERT statement No elevated instance-level permissions
Fixed Server Roles
5: Security
Figure 5-3
Server Role Properties dialog box
Additionally, the following system stored procedures, functions, and views can also be used to view the membership of fixed server roles in SQL Server and to inspect the permissions held by those roles: Name
sp_helpsrvrole sp_srvrolepermission sp_helpsrvrolemember is_srvrolemember sysserver_role_members
Type
System procedure System procedure System procedure System function Catalog view
Description
Displays a list of server roles Displays the permissions assigned to a server role Displays a list of members of a fixed server role Indicates whether a login is part of a role Returns one row for each member of each server role
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Adding Logins to Roles To add a login to a built-in server role, access the Login Properties pages and select the Server Roles page, as shown in Figure 5-4 Alternatively, you can use the following system procedures: sp_addsrvrolemember sp_dropsrvrolemember Adds a login account to a xed server role Removes a login account from a xed server role
Logins may belong to many roles and may be added to or removed from roles at any time
Figure 5-4
The Server Roles page
5: Security
Server Permissions
Although you cannot modify the prebuilt server roles, for a given login, you can add or (effectively) remove permissions from the list that makes up each of the server roles to fine-tune a role to better suit that login Or, you can avoid using roles altogether and assign instance permissions directly to logins Working with Server Permissions From the Securables page of the Login Properties pages (see Figure 5-5), you can grant, revoke, or deny any of the individual instance permissions to a login At this point, you need to be aware of how doing this may impact the permissions already held by the login as a result of belonging to one or more groups Throughout SQL Server (not just relating to server roles) the rules are as follows: Permissions granted are combined A login receives the sum of all the permissions granted through role membership or directly Denying a permission always takes precedence over granting it If role membership grants a permission but either another role or an explicit Deny elsewhere denies it, then the login is denied that permission
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