kauth(9) was introduced in NetBSD 4.0 and is meant to provide a security policy framework. This framework will allow the creation of security modules that can plug into the kernel. Possible security modules could provide security enhancements such as ACL support and MAC policies. The framework will also remove references that hard code the concept of a superuser's complete access to the system, making it possible to create policies that restrict superuser privileges.

To assist developers in the creation of security modules, a set of development guidelines is available in secmodel(9).

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