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.\"-
.\" Copyright (c) 2000 Robert N. M. Watson
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd January 17, 2000
.Dt POSIX1E 3
.Os FreeBSD 4.0
.Sh NAME
.Nm posix1e
.Nd introduction to the POSIX.1e security API
.Sh SYNOPSIS
.Fd #include <sys/acl.h>
.Fd #include <sys/audit.h>
.Fd #include <sys/capability.h>
.Fd #include <sys/mac.h>
.Sh DESCRIPTION
The IEEE POSIX.1e specification never left draft form, but the interfaces
it describes are now widely used despite inherent limitations. Currently,
only a few of the interfaces and features are implemented in FreeBSD,
although efforts are underway to complete the integration at this time.
POSIX.1e describes five security extensions to the base POSIX.1 API:
Access Control Lists (ACLs), Auditing, Capabilities, Mandatory Access
Control, and Information Flow Labels. Of these, the ACL interfaces are
currently included with FreeBSD, Auditing, Capabilities, and Mandatory
Access Control are in the wings, and Information Flow Labels are not on
the calendar.
POSIX.1e defines both syntax and semantics for these features, but fairly
substantial changes are required to implement these features in the
operating system. As shipped, FreeBSD 4.0 permits file systems to export
Access Control Lists via the VFS, and provides a library for userland
access to and manipulation of these ACLs, but support for ACLs is not
provided by any file systems shipped in the base operating system.
Available API calls relating to ACLs are described in detail in
.Xr acl 3 .
The patches supporting other POSIX.1e features are not available in the
base operating system at this time--however, more information on them
may be found on the FreeBSD POSIX.1e implementation web page:
http://www.watson.org/fbsd-hardening/posix1e/
.Sh IMPLEMENTATION NOTES
FreeBSD's support for POSIX.1e interfaces and features is still under
development at this time.
.Sh ENVIRONMENT
POSIX.1e assigns security labels to all objects, extending the security
functionality described in POSIX.1. These additional labels provide
fine-grained discretionary access control, fine-grained capabilities,
and labels necessary for mandatory access control. POSIX.2c describes
a set of userland utilities for manipulating these labels. These userland
utilities are not bundled with
.Fx 4.0
so as to discourage their
use in the short term.
.Sh FILES
.Sh SEE ALSO
.Xr acl 3 ,
.Xr acl 9 ,
.Xr extattr 9
.Sh STANDARDS
POSIX.1e is described in IEEE POSIX.1e draft 17. Discussion
of the draft continues on the cross-platform POSIX.1e implementation
mailing list. To join this list, see the
.Fx
POSIX.1e implementation
page for more information.
.Sh HISTORY
POSIX.1e support was introduced in
.Fx 4.0 ,
and development continues.
.Sh AUTHORS
.An Robert N M Watson ,
.An Ilmar S Habibulin
.Sh BUGS
These features are not yet fully implemented. In particular, the shipped
version of UFS/FFS does not support storage of additional security labels,
and so is unable to (easily) provide support for most of these features.
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