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Impersonating the user If the fa ade decides to impersonate the user, the original user s security context and identity will flow to IIS and then to the Report Server. This is the approach the Report Manager takes for submitting SOAP requests to the Report Server on the server side of the application. To impersonate the user in ASP.NET applications, you can use the <impersonate> element in the web.config configuration file. You can impersonate the user s identity or use a specific Windows account. If the fa ade and the Report Server are located on separate machines, you must enable Kerberos authentication to flow successfully the user identity between the Fa ade and the Report Server because NTLM doesn t support delegation. Then the authentication works as we described in the Client-to-Report Server scenario. Passing the fa ade identity Instead of impersonating the user, the fa ade can pass its own identity. To accomplish this, you would typically change the identity of the ASP.NET worker process to run under a designated domain account. If you decide to use a local computer account, you ll have to clone this account to the Report Server machine to keep the security gods happy. As figure 8.2 shows, the ASP.NET worker process runs under a domain account AW/UID, which is passed on to the Report Server. If the fa ade layer runs under IIS 5 (Windows 2000), this will require that you change the <processModel> element in machine.config. If IIS 6 is used (Windows 2003), you can change the identity of the application pool to which the application belongs. In addition, you ll need to add the account that you used for the pool identity to the Windows 2003 IIS_WPG group. Once the fa ade identity is set up, you must map it to the appropriate role in the Report Server so that it has proper access to RS resources. If the fa ade will fulfill report-rendering tasks only, you could create a security policy to grant the fa ade account Browser role permissions. While the trusted subsystem approach simplifies the authentication process between the fa ade and the Report Server, you need to take care of authenticating the end users and authorizing them at the fa ade layer. We will discuss a possible implementation approach in chapter 12. Authenticating the user represents one half of the security equation. After the authentication, the user must be authorized to access a given resource from the report catalog. 8.1.2 Using role-based authorization Regardless of which authentication model is used, Windows or custom authentication, Reporting Services authorizes requests based on the membership that the user has in one or more RS roles. RS offers a comprehensive role-based security model to authorize user requests. We will first discuss the theory behind this model and then demonstrate how you can manage the role-based security infrastructure with the Report Manager and the Report Server Web service.
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To explain the RS role-based model and how its pieces fit together, we put together the database diagram shown in figure 8.3. Please note that this diagram doesn t exactly match the Report Server physical database model. You will find only the Users, Roles, and Policies tables in the Report Server database; the rest are fictitious. Where, then, does the Report Server store the rest of the role-based security items If you examine the actual Policies table, you will notice that it uses proprietary structures to define the role assignment relationship. When the administrator creates a new security policy for a given user to a securable item, a new record is added to the Policies table. This record specifies the item that is secured, the user s Windows account, and the role-based security policy stored as an XML fragment. Strictly speaking, although not so obvious, tasks in RS are further broken out and consist of entities called permissions. However, for simplicity, permissions are not exposed in the Report Manager UI, so you can t see them. The reason for this is that a task is a fixed collection of permissions and can t be changed. How do you find out what permissions are available with RS In section 8.1.4 we will author a sample report called Show Security Policy, which will list the permissions associated with a given user and report item. To accomplish this, we will use the GetPermissions SOAP API, which returns a collection of permissions, such as Create Data Source, Create Folder, etc. At this point you may be curious as to how permissions can be used if tasks are fixed entities. RS permissions could be useful if you need to write a custom security extension and you need to deal with permissions, for example, if you want the Report Manager to disable controls according to the security policy associated with the interactive user. We will show how to write a custom security extension in chapter 15.
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Figure 8.3 Reporting Services comes with a comprehensive role-based security model based on the user s membership in one or more roles.
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