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MLS Multilevel DBMS Objects
Trusted RUBIX has many DBMS objects that contain child objects. For instance, databases contain catalogs, catalogs contain schemata, schemata contains tables, and tables contain rows. Each of these objects may contain child objects that have a sensitivity label that is different than the parent object. The general MLS rule is that a parent object may contain a child object only if that child object's sensitivity label dominates the parent's sensitivity label. Thus, parents objects are able to hold child objects at the same label or higher.
MLS multilevel DBMS objects allow container objects to store information from various sensitivity labels while allowing each user to have a view of the database which corresponds to his clearance label, only seeing objects which are dominated by his clearance. All of this happens automatically within Trusted RUBIX.
The following diagram demonstrates a database configuration with multiple MLS multilevel DBMS objects.
Each user will have a view of the database which corresponds to his clearance label. Objects for which the user is not cleared to access (i.e., those which he does not dominate) will be automatically filtered out of the user's view. Polyinstantiation will insure that naming collisions do not reveal the existence of higher level objects.
The following diagram shows the logical view a user would have of the database with an Unclassified, Confidential, and Secret clearance. A Top Secret clearance would have all objects visible and present a view of the database that corresponds to the first diagram.
Views of MLS Multilevel Objects by Clearance