SECURING REPORTING SERVICES in Visual Basic .NET

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SECURING REPORTING SERVICES
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Note that the diagram in figure 9.3 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 9.5.1 we author a sample report called Show Security Policy, which lists the permissions associated with a given user and report item. To accomplish this, we use the GetPermissions SOAP API, which returns a collection of permissions, such as Create Data Source, Create Folder, and so forth. 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 show you how to write a custom security extension in chapter 13. 9.3.1 Understanding tasks A task defines a set of permissions that can be enforced through role-based security. For example, RS defines a task called View Reports, which allows users to run reports. RS defines two types for tasks: System-level tasks Item-level tasks System-level tasks represent maintenance actions, such as Define Roles. Item-level tasks define user permissions View Reports, View Folders, and so on. Another way to differentiate between these two types is to note that system-level tasks work on global items (which do not have catalog paths), while item-level tasks work on items with paths. You can find the full list of predefined tasks under the Site Settings menu. Currently, RS doesn t support custom tasks. For this reason, you won t find a Task table in the Report Server database. In addition, you cannot map users directly to tasks. Instead, to use a task, you first need to assign it to a role.
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Defining roles As its name suggests, the role-based security infrastructure in RS uses the concept of roles to assign a set of permissions to users with the same security requirements. Simply put, a role is a named set of tasks. Currently, RS doesn t support nested roles. For example, you cannot set up a Content Manager role to include the Browser role. Because the relationship between roles and tasks is many-to-many, the documentation uses the term role definition to represent the tasks-to-role membership. For example, RS includes the predefined item-level Browser and Content Manager roles, and both of them include the View Reports task.
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Strictly speaking, Reporting Services implements the roles-to-tasks relationship by a bit-masked value defined in the TaskMask column in the Roles table. For this reason, the terms role and role definition are interchangeable. However, we broke it down into two tables to make the concept easier to understand.
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Similar to the task types, RS classifies roles in two categories: system roles and itemlevel roles. System-level roles Most applications need an Administrator role that has unrestricted access to the application to perform application-wide maintenance tasks. Reporting Services is no exception. It defines two system roles, as shown in table 9.1.
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Table 9.1 Predefined system roles Rights View system properties and shared schedules System User rights plus the rights to view and modify system role assignments and role definitions
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