Metamodel Asset Administration Shell for Security
The overall concept is the use of the Admnistrative Asset Shell (AAS). It is requesting access to an object. In the context of an AAS an object typically is a submodel or a property or any other submodel element connected to the asset. The implemented access control mechanism of the AAS evaluates the access permission rules (2a) that include constraints that need to be fulfilled w.r.t. the subject attributes (2b), the object attributes and the environment conditions (2d). The focus is on access control. An object in the context of ABAC corresponds typically to a submodel or to a submodel element. The object attributes again are modelled as submodel elements. Subject Attributes need to be accessed either via an external policy information point or they are defined as properties within a special submodel of the AAS. A typical subject attribute is its role. The role is the only subject attribute defined in case of role based access control. Optionally, environment conditions can be defined. In role based access control no environment conditions are defined. Environment conditions can be expressed via formula constraints. To be able to do so the values needed should be defined as property or reference to data within a submodel of the AAS.