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You won t use them to make decisions at runtime, but you might use them to ensure that even if webconfig rules are modified or circumvented, a basic level of security remains..

Changing declarative permissions means that you need to recompile the application. But why use them if every change requires recompilation Don t you want to have the possibility of managing roles in terms of adding, deleting, and changing them Yes, and that requires more generic code, but it can t be done with declarative permissions. So, when is it helpful to use declarative permissions Well, declarative permissions are especially suited for fixed roles in your application that cannot be deleted anyway. For example, an Administrators role is required in most applications and therefore cannot be deleted. So, you can secure functionality that should be accessible to only administrators with declarative permissions. Typical examples in Windows are all the built-in groups such as Administrators, Power Users, Backup Operators, and Users.

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ASP .NET 2.0 ships with a ready-to-use infrastructure for managing and using roles (as well as the Membership API introduced in 21). This infrastructure which is completely extensible through providers such as the Membership API includes prebuilt functionality for managing roles, assigning roles to users, and accessing all the role information from code. In more detail, the roles infrastructure includes the following: A provider-based extensible mechanism for including different types of role data stores. A ready-to-use implementation of a provider for SQL Server and the necessary database tables based on the Membership database introduced in 21. These tables associate Membership user entries with roles in a many-to-many relationship and are automatically created when calling the aspnet_regsql.exe tool (also introduced in 21). The prebuilt RolePrincipal class that is automatically initialized for authenticated users through the RoleManagerModule (also included with the Roles infrastructure). Complete programmatic access to the roles through the Roles class. To use this infrastructure, you have to first enable it. You can do this either by checking the Enable Roles for This Web Site box when running through the security wizard or by clicking the Enable Roles link in the Security tab of the WAT. Figure 23-2 shows both of these possibilities.

Since keys are checked in the internal dictionaries in the same order they were passed in , is in the second example, while it was in the first one.

In both cases, the tool adds a little configuration entry to the application s web.config file. You can do this manually, just as you can enable the Roles Service. <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <system.web> <roleManager enabled="true" /> <authentication mode="Forms" /> </system.web> </configuration> With this configuration in place, ASP.NET automatically creates a file-based database, ASPNETDB.MDF, in the application s App_Data directory, as already described in 21. If you want to use a custom store, you have to complete the following steps: 1. Create the data store either by using aspnet_regsql.exe or by executing the TSQL command scripts included in the .NET Framework directory. Both were introduced in 21. 2. Configure the Roles provider to use the previously created custom store. You can configure the Roles provider through the <roleManager> tag. You can either use a different database or use a completely different store if you want. In addition, you can configure certain properties through the <roleManager> tag that can t be configured in the WAT. <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <connectionStrings> <add name="MySqlStore" connectionString="data source=(local); Integrated Security=SSPI;initial catalog=MySqlDB"/> </connectionStrings> <system.web> <roleManager enabled="true" defaultProvider="MySqlProvider" cacheRolesInCookie="true" cookieName=".MyRolesCookie" cookieTimeout="30" cookieSlidingExpiration="true" cookieProtection="All"> <providers> <add name="MySqlProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="MySqlStore" applicationName="RolesDemo"/> </providers> </roleManager> <authentication mode="Forms"/> <compilation debug="true"/> </system.web> </configuration> As soon as you have added this configuration entry to your web.config file, you can select the provider through the WAT. Just switch to the Provider tab, and then click the link Select a Different Provider for Each Feature. Figure 23-3 shows the provider selection in the WAT.

Figure 23-3. The Roles provider in the web-based configuration tool Table 23-1 lists the properties you can configure through the <roleManager> configuration tag. Table 23-1. Options for the <roleManager> Configuration

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