135 lines
4.4 KiB
Groff
135 lines
4.4 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 May 20, 2009
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.Dt POSIX1E 3
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.Os
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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 LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/acl.h
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.\" .In sys/capability.h
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.In 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.
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Currently, only a few of the interfaces and features are implemented in
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.Fx ,
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although efforts are underway to complete the integration at this time.
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.Pp
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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.
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.Fx
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supports POSIX.1e ACL interfaces, as well as POSIX.1e-like MAC
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interfaces.
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The TrustedBSD Project has produced but not integrated an implementation
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of POSIX.1e Capabilities.
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.Pp
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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.
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.Pp
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As shipped,
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.Fx 4.0
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provides API and VFS support for ACLs, but not an implementation on any
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native file system.
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.Fx 5.0
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includes support for ACLs as part of UFS1 and UFS2, as well as necessary
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VFS support for additional file systems to export ACLs as appropriate.
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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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.Pp
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As shipped,
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.Fx 5.0
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includes support for Mandatory Access Control as well as POSIX.1e-like
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APIs for label management.
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More information on API calls relating to MAC is available in
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.Xr mac 3 .
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.Pp
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Additional patches supporting POSIX.1e features are provided by the
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TrustedBSD project:
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.Pp
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http://www.TrustedBSD.org/
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.Sh IMPLEMENTATION NOTES
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.Fx Ns 's
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support for POSIX.1e interfaces and features is still under
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development at this time, and many of these features are considered new
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or experimental.
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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.
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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.
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POSIX.2c describes
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a set of userland utilities for manipulating these labels.
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.Pp
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Many of these services are supported by extended attributes, documented
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in
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.Xr extattr 2
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and
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.Xr extattr 9 .
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While these APIs are not documented in POSIX.1e, they are similar in
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structure.
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.Sh SEE ALSO
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.Xr extattr 2 ,
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.Xr acl 3 ,
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.Xr libbsm 3 ,
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.Xr mac 3 ,
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.Xr acl 9 ,
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.Xr extattr 9 ,
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.Xr mac 9
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.Sh STANDARDS
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POSIX.1e is described in IEEE POSIX.1e draft 17.
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Discussion of the draft continues
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on the cross-platform POSIX.1e implementation
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mailing list.
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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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most of the features are available as of
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.Fx 5.0 .
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Development continues.
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.Sh AUTHORS
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.An Robert N M Watson
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.An Chris D. Faulhaber
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.An Thomas Moestl
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.An Ilmar S Habibulin
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.Sh BUGS
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Many of these features are considered new or experimental in
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.Fx 5.0
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and should be deployed with appropriate caution.
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