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/*-
* Copyright (c) 2001 Networks Associates Technologies, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by 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 AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#ifndef LOMAC_H_
#define LOMAC_H_
typedef enum {
LOMAC_LOWEST_LEVEL = 1,
LOMAC_HIGHEST_LEVEL = 2
} level_t;
typedef struct {
level_t level; /* level (an integer range) */
unsigned int flags; /* category flags */
} lattr_t; /* lomac attribute structure type */
/* lomac_must_demote()
*
* in: actor - attributes of a subject that has or will perform an
* operation that may require LOMAC to demote it.
* target - attributes of the object that is or was the operand.
* out: nothing
* return: value condition
* ----- ---------
* 0 LOMAC should not demote the subject
* 1 LOMAC should demote the subject
*
* This function is a predicate which decides whether or not LOMAC should
* demote the subject with attributes `actor' after it performs an operation
* (probably some kind of a read operation) on the object with attributes
* `target'.
*
*/
static __inline int
lomac_must_demote(const lattr_t *actor, const lattr_t *target) {
return (actor->level > target->level);
}
/* lomac_must_deny()
*
* in: actor - attributes of a subject that wants to perform some
* operation that requires LOMAC to make an allow/deny
* decision.
* target - attributes of the subject or object the above subject
* will operate upon.
* out: nothing
* return: value condition
* ----- ---------
* 0 LOMAC should allow the operation
* 1 LOMAC should deny the operation
*
* This function is a predicate which decides whether or not LOMAC should
* allow the subject with attributes `actor' to perform some operation
* (probably some kind of write or kill operation) on the subject or object
* with attributes `target'.
*
* The flags are two words: the low word is to be used for categories,
* and the high word is meant to hold implementation-dependent flags that
* are not category-related.
*
*/
static __inline int
lomac_must_deny(const lattr_t *actor, const lattr_t *target) {
if (actor->level >= target->level)
return 0; /* allow */
if (target->flags & 0xffff) {
if ((actor->flags & target->flags & 0xffff) ==
(target->flags & 0xffff)) {
return 0; /* allow */
}
}
return 1; /* deny */
}
#endif /* LOMAC_H */
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