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Linux systems, as many others in the Unix family, have a well-known lack of access control. There is a small granularity of discretionary access rights, only dividing between read, write and execute rights for file owner, and file group members. The RSBAC (Rule Set Based Access Control) framework solves this access control deficiency by giving detailed access control information, and you can implement almost any access control model in it, e.g. as a runtime registered kernel module. Also, there is a powerful logging system which makes intrusion attempts easily detectable.

RSBAC Homepage