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115 lines
4.1 KiB
C
115 lines
4.1 KiB
C
/*-
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* Copyright (c) 2001 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by NAI Labs, the
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* Security Research Division of Network Associates, Inc. under
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* DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
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* CHATS research program.
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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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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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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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#ifndef LOMAC_H_
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#define LOMAC_H_
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typedef enum {
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LOMAC_LOWEST_LEVEL = 1,
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LOMAC_HIGHEST_LEVEL = 2
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} level_t;
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typedef struct {
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level_t level; /* level (an integer range) */
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unsigned int flags; /* category flags */
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} lattr_t; /* lomac attribute structure type */
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/* lomac_must_demote()
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*
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* in: actor - attributes of a subject that has or will perform an
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* operation that may require LOMAC to demote it.
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* target - attributes of the object that is or was the operand.
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* out: nothing
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* return: value condition
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* ----- ---------
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* 0 LOMAC should not demote the subject
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* 1 LOMAC should demote the subject
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*
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* This function is a predicate which decides whether or not LOMAC should
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* demote the subject with attributes `actor' after it performs an operation
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* (probably some kind of a read operation) on the object with attributes
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* `target'.
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*
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*/
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static __inline int
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lomac_must_demote(const lattr_t *actor, const lattr_t *target) {
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return (actor->level > target->level);
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}
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/* lomac_must_deny()
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*
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* in: actor - attributes of a subject that wants to perform some
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* operation that requires LOMAC to make an allow/deny
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* decision.
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* target - attributes of the subject or object the above subject
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* will operate upon.
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* out: nothing
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* return: value condition
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* ----- ---------
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* 0 LOMAC should allow the operation
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* 1 LOMAC should deny the operation
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*
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* This function is a predicate which decides whether or not LOMAC should
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* allow the subject with attributes `actor' to perform some operation
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* (probably some kind of write or kill operation) on the subject or object
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* with attributes `target'.
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*
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* The flags are two words: the low word is to be used for categories,
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* and the high word is meant to hold implementation-dependent flags that
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* are not category-related.
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*
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*/
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static __inline int
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lomac_must_deny(const lattr_t *actor, const lattr_t *target) {
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if (actor->level >= target->level)
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return 0; /* allow */
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if (target->flags & 0xffff) {
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if ((actor->flags & target->flags & 0xffff) ==
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(target->flags & 0xffff)) {
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return 0; /* allow */
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}
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}
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return 1; /* deny */
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}
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#endif /* LOMAC_H */
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