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Taken as a whole, RBAC is an approach to restricting access to systems and data based on the need of administrators and users to do their jobs. In other words, you should only have access to information that you need rather than access to a lot of data that you really don t. RBAC is not a new concept, and it has been implemented in other operating systems and applications including HP-UX, Linux, Oracle DBMS, SAP R/3, and others. Previous versions of Exchange use Windows access control lists (ACLs) to grant permissions to users and administrators to allow them to do their work. ACLs are an effective way to manage permissions for environments that are well structured and do not tend to change much over time. Windows itself and many of the applications that run on Windows fall into this category. Exchange is a little more dynamic and spans hundreds of thousands of objects in its largest deployments. Tracking and updating ACLs across such a dynamic environment for so many objects is a real challenge, and the real-world experience revealed that ACLs are often updated incorrectly, can be difficult to understand and therefore debug when things go wrong, and are prone to disruption through changes applied by software upgrades or patches. Another issue is that the conventional model of creating, updating, and setting permissions on objects often doesn t translate well into the task-driven environment that exists within an application such as Exchange where permissions have to support scenarios such as permitting help desk personnel to reset a user s password without being able to affect any other setting of the user s account. The granularity available in RBAC addresses this need.
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4 Role-Based Access Control
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Even if some problems are encountered as administrators learn about RBAC and make the transition from the previous permissions model, Microsoft believes that Exchange s implementation of RBAC will avoid complexity and ease management over time. In addition, RBAC should simplify matters for administrators enormously by removing the need to grapple with ACLs on a daily basis. Instead, administrators should be able to assign the ability to perform tasks by adding users to role groups, leaving RBAC to do all the necessary ACL maintenance in the background. It is impossible to understate the influence of RBAC throughout Exchange 2010. It would require a 300-page book to cover every aspect of RBAC in depth. This chapter does not attempt to present such comprehensive coverage. Instead, the basics are set out to get you started and encourage you to investigate further to determine how best to apply RBAC to help you manage your organization.
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When Microsoft discusses RBAC in Exchange 2010, they often describe it in the form of a triangle (Figure 4-1) to show how roles, role groups, scopes, and assignments fit together.
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Scope (the objects that a role can affect)
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Role Assignment (the glue that holds everything together)
Role Group (who can do it)
Figure 4-1 The RBAC triangle.
These are the major elements of RBAC as implemented in Exchange 2010: Management role A collection of role entries that define the set of cmdlets and parameters that a user can run.
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Management role group A container for a group of management roles that collectively allow a user to function in a role such as recipient management. Exchange 2010 includes a default set of management role groups, and you can define new management role groups to meet specific needs that are not served by a default role group. Management role assignment The ability to assign a management role to an individual user or to the members of a role group (universal security group). Management role assignment policies Management role groups are primarily intended for use by administrators to enable them to perform administrative tasks such as recipient management. The ability of users to work with personal data is controlled by management role assignment policies. Out of the box, Exchange 2010 provides a default role assignment policy that defines how users can update the information in their profiles (contact phone numbers, display name, and so on) and distribution group membership. The default role assignment policy is automatically assigned to users when their mailbox is created or moved to an Exchange 2010 server unless another role assignment policy is explicitly assigned. A mailbox can only be assigned a single role assignment policy at a time. Management role scope The definition of the scope or the collection of objects that a management role can work with. A role such as Organization Management has a scope of the complete organization because the users who hold this role have to be able to manage any object in the entire organization. Other roles might be restricted to a particular scope such as an organizational unit (OU) in Active Directory to allow a fine granularity of management operations, such as the ability to manage mailboxes that belong to a certain region. Management role entries Permit access to one or more cmdlets to enable a user to perform a certain task. For example, access to the New-Mailbox cmdlet allows a user to create a new mailbox. It is possible to restrict role entries to selected parameters for a cmdlet.
Another way of understanding RBAC is to look at it from the perspective of the work that someone does with Exchange. This will be either as an administrator or as an end user. The methods used by RBAC to associate the rights that the two groups need to do their work are as follows:
Administrators and other specialist users who have to perform operational tasks with an Exchange server gain the rights to do their work through membership in appropriate role groups. Each role group consists of a number of roles. To give administrators permission to do something, simply assign them the correct management role by putting them into the appropriate role group.
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