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Role-Based Access Control (RBAC) was first introduced in Solaris 8 as a means of defining roles for managing a specific task or set of tasks, based on a set of
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administrator-defined profiles. Although the RBAC implementation supplied with Solaris is a Sun-specific product, it is based on a standard developed by NIST (see http://csrc.nist.gov/rbac/ for more information). Broadly defined, access control extends beyond the notion of administrative access: it can be defined as the ability to create, read, update, and delete data from a system. Standard file system permissions are based on this principle: various users and groups have access permissions to data stored in files based on a permission string that is associated with every file on the file system. However, although file access can be easily demarcated along organizational lines, deciding who should and who should not have administrative access to execute applications can be a more complex issue. What if a secretary needs to have root access to a system to add or delete users as they join an organization Data entry of this kind seems like a reasonable task for a secretary, but it is usually assigned to system administrators, because it requires root access. RBAC allows tasks like these to be separated from other tasks that do require a high level of technical knowledge, such as managing metadevices.
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The first stage of implementing RBAC is to define roles, which are then assigned to individual users. Access rights to various resources can then be associated with a specific role name. As with any organization, change to roles and the users who are associated with roles is inevitable, so the process for reflecting these changes in the list of roles and users needs to be as easy to implement as possible. In addition, individual tasks are not always easy to associate with a single role: indeed, in a large organization, some tasks will be performed by a number of different employees. It s also possible to assign specific authorizations to specific users, bypassing roles, but this defeats the whole role-based purpose of RBAC, and is not recommended. One way of dealing with task overlap is to introduce the notion of hierarchies: profiles and authorizations at the bottom of a conceptual hierarchy are inherited by the assignment of a role at a higher level. For example, a role defined as backup maintainer involves running ufsdump, which in turn requires write access to the tape device. Thus, the backup role inherently requires access to lower-level profiles for which new roles do not need to be separately defined. Another role, such as device manager, may also require write access to the tape device, through the tapes command. Again, no separate role is required to be created for those tasks that form part of the role by inference. However, although Solaris RBAC does support hierarchies of profiles and authorizations, it does not support hierarchies of roles. When a user assumes a role, the effect is all-or-nothing: no inheritance of roles is allowed. By default, Solaris 10 supports three different system-management roles: Primary Administrator (PA) for security System Administrator (SA) is not security-related Operator Assigns rights to other users and is responsible Is responsible for day-to-day administration that
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Figure 11-1 shows the hierarchy of rights associated with the different roles. The distinction between PA and SA will depend on the local security policy. For example, whereas the default PA role permits both adding users and changing passwords, the default SA role does not permit password modifications. However, for many sites, denying SAs access to passwords would be impractical. One of the great benefits of RBAC is that the rights granted to different profiles can be easily modified and customized to suit local requirements. Parallels can be drawn with Trusted Solaris and the assignment of tasks with different levels of authority to completely different roles.
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