Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Add some new options to mac_bsdestended. We can now match on:

subject: ranges of uid, ranges of gid, jail id
objects: ranges of uid, ranges of gid, filesystem,
object is suid, object is sgid, object matches subject uid/gid
object type

We can also negate individual conditions. The ruleset language is
a superset of the previous language, so old rules should continue
to work.

These changes require a change to the API between libugidfw and the
mac_bsdextended module. Add a version number, so we can tell if
we're running mismatched versions.

Update man pages to reflect changes, add extra test cases to
test_ugidfw.c and add a shell script that checks that the the
module seems to do what we expect.

Suggestions from: rwatson, trhodes
Reviewed by: trhodes
MFC after: 2 months

Add bsde_add_rule(), which is similar to bsde_set_rule() except that
the caller does not specify the rule number -- instead, the kernel
module is probed for the next available rule, which is then used.

Obtained from: TrustedBSD Project
Sponsored by: DARPA, McAfee Research

License and blurb update authorized by Network Associates.

Use size_t instead of int for len variables passed in/out of sysctl.

Pointed out by: jake

Introduce support for Mandatory Access Control and extensible
kernel access control.

Provide a library to manage user file system firewall-like rules
supported by the mac_bsdextended.ko security model. The kernel
module exports the current rule set using sysctl, and this
library provides a front end that includes support for retrieving
and setting rules, as well as printing and parsing them.

Note: as with other userland components, this is a WIP. However,
when used in combination with the soon-to-be-committed ugidfw,
it can actually be quite useful in multi-user environments to
allow the administrator to limit inter-user file operations without
resorting to heavier weight labeled security policies.

Obtained form: TrustedBSD Project
Sponsored by: DARPA, NAI Labs