1/*-
  2 * Copyright (c) 1999-2002 Robert N. M. Watson
  3 * Copyright (c) 2001-2004 Networks Associates Technology, Inc.
  4 * All rights reserved.
  5 *
  6 * This software was developed by Robert Watson for the TrustedBSD Project.
  7 *
  8 * This software was developed for the FreeBSD Project in part by Network
  9 * Associates Laboratories, the Security Research Division of Network
 10 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
 11 * as part of the DARPA CHATS research program.
 12 *
 13 * Redistribution and use in source and binary forms, with or without
 14 * modification, are permitted provided that the following conditions
 15 * are met:
 16 * 1. Redistributions of source code must retain the above copyright
 17 *    notice, this list of conditions and the following disclaimer.
 18 * 2. Redistributions in binary form must reproduce the above copyright
 19 *    notice, this list of conditions and the following disclaimer in the
 20 *    documentation and/or other materials provided with the distribution.
 21 *
 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 32 * SUCH DAMAGE.
 33 */
 34/*
 35 * Definitions for the TrustedBSD MLS confidentiality policy module.
 36 */
 37#ifndef _SYS_SECURITY_MAC_MLS_H
 38#define	_SYS_SECURITY_MAC_MLS_H
 39
 40#define	MAC_MLS_EXTATTR_NAMESPACE	EXTATTR_NAMESPACE_SYSTEM
 41#define	MAC_MLS_EXTATTR_NAME		"mac_mls"
 42
 43#define	MAC_MLS_LABEL_NAME		"mls"
 44
 45#define	MAC_MLS_FLAG_EFFECTIVE	0x00000001	/* mm_effective initialized */
 46#define	MAC_MLS_FLAG_RANGE	0x00000002	/* mm_range* initialized */
 47#define	MAC_MLS_FLAGS_BOTH	(MAC_MLS_FLAG_EFFECTIVE | MAC_MLS_FLAG_RANGE)
 48
 49#define	MAC_MLS_TYPE_UNDEF	0	/* Undefined */
 50#define	MAC_MLS_TYPE_LEVEL	1	/* Hierarchal level with mm_level. */
 51#define	MAC_MLS_TYPE_LOW	2	/* Dominated by any
 52					 * MAC_MLS_TYPE_LABEL. */
 53#define	MAC_MLS_TYPE_HIGH	3	/* Dominates any
 54					 * MAC_MLS_TYPE_LABEL. */
 55#define	MAC_MLS_TYPE_EQUAL	4	/* Equivalent to any
 56					 * MAC_MLS_TYPE_LABEL. */
 57
 58/*
 59 * Structures and constants associated with a Multi-Level Security policy.
 60 * mac_mls represents an MLS label, with mm_type determining its properties,
 61 * and mm_level represents the hierarchal sensitivity level if valid for the
 62 * current mm_type.  If compartments are used, the same semantics apply as
 63 * long as the suject is in every compartment the object is in.  LOW, EQUAL
 64 * and HIGH cannot be in compartments.
 65 */
 66
 67/*
 68 * MLS compartments bit set size (in bits).
 69 */
 70#define	MAC_MLS_MAX_COMPARTMENTS	256
 71
 72struct mac_mls_element {
 73	u_short	mme_type;
 74	u_short	mme_level;
 75	u_char	mme_compartments[MAC_MLS_MAX_COMPARTMENTS >> 3];
 76};
 77
 78/*
 79 * MLS labels consist of two components: an effective label, and a label
 80 * range.  Depending on the context, one or both may be used; the mb_flags
 81 * field permits the provider to indicate what fields are intended for
 82 * use.
 83 */
 84struct mac_mls {
 85	int			mm_flags;
 86	struct mac_mls_element	mm_effective;
 87	struct mac_mls_element	mm_rangelow, mm_rangehigh;
 88};
 89
 90/*
 91 * MLS compartments bit test/set macros.
 92 * The range is 1 to MAC_MLS_MAX_COMPARTMENTS.
 93 */
 94#define	MAC_MLS_BIT_TEST(b, w) \
 95	((w)[(((b) - 1) >> 3)] & (1 << (((b) - 1) & 7)))
 96#define	MAC_MLS_BIT_SET(b, w) \
 97	((w)[(((b) - 1) >> 3)] |= (1 << (((b) - 1) & 7)))
 98#define	MAC_MLS_BIT_SET_EMPTY(set)	mls_bit_set_empty(set)
 99
100#endif /* !_SYS_SECURITY_MAC_MLS_H */