Combining RBAC and ABAC Sample Clauses

Combining RBAC and ABAC. A lot of research has been done on combining a role based access control with attributes in order to gather the advantages that both of the present. In (Cirio, 2007) they present a role-based access control approach (RBAC) and extend it with contextual attributes to introduce flexibility into the procedure of role assignment. Another interesting approach is presented in (Xxxx, 2010) where they merge the best characteristics of RBAC and ABAC in order to provide an effective access control for distributed and quickly changing applications. As it is explained in this research work, while ABAC may require 2n rules for n attributes, trying to implement the same controls in RBAC would require up to 2n roles, one for each possible combination of attributes. Next table sums up the different options available for combining RBAC with ABAC (RBAC-A), where U=user/subject ID; R=role; A=attributes: Figure 20: Different possibilities of integrating attributes with RBAC. Source: (Xxxx, 2010) Options 1 and 3, which do not have a user ID, could be applied in public places where the user’s identity does not determine user access. Option 4 (only User, not role, not attributes) represents the Access Control Lists as explained above, while option 5 (User ID and attributes) represents an ABAC model but including the user ID and option 6 (User ID and roles) represents a basic RBAC model. Finally, the RBAC-A model is obtained only if User ID, Role and attributes are included. This paper proposes three RBAC-A approaches as it is shown in the table above:  Dynamic roles: Some attributes such as time of the day or date are dynamic, that is, they change rapidly over time (Environment introduced in section 3.2.5). These attributes are used to determine the subject’s role maintaining the classical role structure while changing the role sets dynamically.  Attribute-centric: This approach proposes that the “role” is just an attribute, not a set of permissions as in RBAC. The problem of this approach is that it becomes more complex as more attributes are added.  Role-centric: This approach limits RBAC by adding attributes, that is, the incorporation of attributes reduces the available permissions for the user. After this analysis a combined design is decided to be used as normally some attributes are static (profession, job position, etc) and some others are dynamic (time of the day, day of the week, etc). A clarifying example is proposed in order to demonstrate the advantages of this s...
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