Introduce support for Mandatory Access Control and extensible

kernel access control.

Extensions to libc to provide basic MAC label manipulation facilities
for userland.  These interface will be replaced in the next month
or two with more flexible interfaces, but provide sufficient support
to allow use of the Biba and MLS policies for user applications.

libc_r wrappers to follow.

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

1 files changed, 169 insertions, 0 deletions

diff --git a/lib/libc/posix1e/mac_text.3 b/lib/libc/posix1e/mac_text.3
new file mode 100644
index 0000000..46aec34
--- /dev/null
+++ b/lib/libc/posix1e/mac_text.3
@@ -0,0 +1,169 @@
+.\" Copyright (c) 2001 Networks Associates Technology, Inc.
+.\" All rights reserved.
+.\" 
+.\" This software was developed for the FreeBSD Project by Chris
+.\" Costello at Safeport Network Services and NAI Labs, the Security
+.\" Research Division of Network Associates, Inc. under DARPA/SPAWAR
+.\" contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
+.\" research program.
+.\" 
+.\" 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.
+.\" 3. The name of the author may not be used to endorse or promote
+.\"    products derived from this software without specific prior written
+.\"    permission.
+.\" 
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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 December 21, 2001
+.Dt MAC_TEXT 3
+.Sh NAME
+.Nm mac_from_text ,
+.Nm mac_to_text
+.Nd convert MAC label to/from text representation
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mac.h
+.Ft mac_t
+.Fn mac_from_text "const char *text_p"
+.Ft "char *"
+.Fn mac_to_text "mac_t label" "size_t *len_p"
+.Sh DESCRIPTION
+The
+.Fn mac_from_text
+function converts the text representation of a label
+into a
+.Vt mac_t ,
+which must later be freed with
+.Xr mac_free .
+The
+.Fn mac_to_text
+function returns
+the text representation of
+.Fa label
+and sets
+.Fa *len_p
+to the length of the returned string.
+.Pp
+.Fx
+uses the following format
+for MAC policy text representations:
+.Pp
+.Dl Sy policy Ns No / Ns Sy qualifier
+.Pp
+Where
+.Sy policy
+can be one of
+.Dq biba ,
+.Dq mls ,
+or
+.Dq te .
+.Pp
+Valid labels can have the following arguments for
+.Sy qualifier ,
+depending on the value of
+.Sy policy .
+.Bl -tag -width "Policy" -offset indent
+.It Em Policy
+.Em Qualifier
+.It biba
+.Dq high ,
+.Dq low ,
+.Dq equal ,
+or a numeric grade.
+.It mls
+.Dq high ,
+.Dq low ,
+.Dq equal ,
+or a numeric level.
+.It te
+Types for
+.Dq te
+consist of a type name which must
+neither be empty nor exceed the length limit for the label.
+.El
+.Pp
+All policies must be present
+in a comma-separated list,
+but may be in any order
+(see
+.Sx EXAMPLES ) .
+.Sh RETURN VALUES
+The
+.Fn mac_from_text
+function returns a valid
+.Vt mac_t
+equivalent to
+the MAC label described in
+.Fa text_p
+upon success, and
+.Dv NULL
+upon failure, setting
+.Va errno
+to indicate the error.
+.Pp
+The
+.Fn mac_to_text
+function returns a string
+containing the text representation of
+.Fa label
+upon success, and
+.Dv NULL
+upon failure, setting
+.Va errno
+to indicate the error.
+.Sh EXAMPLES
+The following are valid MAC labels:
+.Bd -literal -offset indent
+biba/high,mls/low,te/none
+biba/low,mls/low,te/none
+biba/low,mls/3,te/none
+.Ed
+.Sh COMPATIBILITY
+POSIX.1e does not define
+a text format for text representations
+of MAC labels.
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er EINVAL
+An invalid policy or qualifier
+was specified in
+.Fa text_p ,
+or an invalid MAC label
+was specified in
+.Fa label .
+.It Bq Er ENOMEM
+Insufficient memory was available
+to allocate internal storage.
+.El
+.Sh SEE ALSO
+.Xr mac 3 ,
+.Xr mac_free 3 ,
+.Xr mac_get 3 ,
+.Xr mac_set 3
+.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.