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