1
2 /* Author : Stephen Smalley, <sds@epoch.ncsc.mil> */
3 /*
4 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
5 *
6 * Support for enhanced MLS infrastructure.
7 *
8 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
9 *
10 * This library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with this library; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 /* FLASK */
26
27 /*
28 * Type definitions for the multi-level security (MLS) policy.
29 */
30
31 #ifndef _SEPOL_POLICYDB_MLS_TYPES_H_
32 #define _SEPOL_POLICYDB_MLS_TYPES_H_
33
34 #include <stdint.h>
35 #include <stdlib.h>
36 #include <sepol/policydb/ebitmap.h>
37 #include <sepol/policydb/flask_types.h>
38
39 typedef struct mls_level {
40 uint32_t sens; /* sensitivity */
41 ebitmap_t cat; /* category set */
42 } mls_level_t;
43
44 typedef struct mls_range {
45 mls_level_t level[2]; /* low == level[0], high == level[1] */
46 } mls_range_t;
47
mls_level_cpy(struct mls_level * dst,struct mls_level * src)48 static inline int mls_level_cpy(struct mls_level *dst, struct mls_level *src)
49 {
50
51 dst->sens = src->sens;
52 if (ebitmap_cpy(&dst->cat, &src->cat) < 0)
53 return -1;
54 return 0;
55 }
56
mls_level_init(struct mls_level * level)57 static inline void mls_level_init(struct mls_level *level)
58 {
59
60 memset(level, 0, sizeof(mls_level_t));
61 }
62
mls_level_destroy(struct mls_level * level)63 static inline void mls_level_destroy(struct mls_level *level)
64 {
65
66 if (level == NULL)
67 return;
68
69 ebitmap_destroy(&level->cat);
70 mls_level_init(level);
71 }
72
mls_level_eq(const struct mls_level * l1,const struct mls_level * l2)73 static inline int mls_level_eq(const struct mls_level *l1, const struct mls_level *l2)
74 {
75 return ((l1->sens == l2->sens) && ebitmap_cmp(&l1->cat, &l2->cat));
76 }
77
mls_level_dom(const struct mls_level * l1,const struct mls_level * l2)78 static inline int mls_level_dom(const struct mls_level *l1, const struct mls_level *l2)
79 {
80 return ((l1->sens >= l2->sens) && ebitmap_contains(&l1->cat, &l2->cat));
81 }
82
83 #define mls_level_incomp(l1, l2) \
84 (!mls_level_dom((l1), (l2)) && !mls_level_dom((l2), (l1)))
85
86 #define mls_level_between(l1, l2, l3) \
87 (mls_level_dom((l1), (l2)) && mls_level_dom((l3), (l1)))
88
89 #define mls_range_contains(r1, r2) \
90 (mls_level_dom(&(r2).level[0], &(r1).level[0]) && \
91 mls_level_dom(&(r1).level[1], &(r2).level[1]))
92
mls_range_cpy(mls_range_t * dst,mls_range_t * src)93 static inline int mls_range_cpy(mls_range_t * dst, mls_range_t * src)
94 {
95
96 if (mls_level_cpy(&dst->level[0], &src->level[0]) < 0)
97 goto err;
98
99 if (mls_level_cpy(&dst->level[1], &src->level[1]) < 0)
100 goto err_destroy;
101
102 return 0;
103
104 err_destroy:
105 mls_level_destroy(&dst->level[0]);
106
107 err:
108 return -1;
109 }
110
mls_range_init(struct mls_range * r)111 static inline void mls_range_init(struct mls_range *r)
112 {
113 mls_level_init(&r->level[0]);
114 mls_level_init(&r->level[1]);
115 }
116
mls_range_destroy(struct mls_range * r)117 static inline void mls_range_destroy(struct mls_range *r)
118 {
119 mls_level_destroy(&r->level[0]);
120 mls_level_destroy(&r->level[1]);
121 }
122
mls_range_eq(struct mls_range * r1,struct mls_range * r2)123 static inline int mls_range_eq(struct mls_range *r1, struct mls_range *r2)
124 {
125 return (mls_level_eq(&r1->level[0], &r2->level[0]) &&
126 mls_level_eq(&r1->level[1], &r2->level[1]));
127 }
128
129 typedef struct mls_semantic_cat {
130 uint32_t low; /* first bit this struct represents */
131 uint32_t high; /* last bit represented - equals low for a single cat */
132 struct mls_semantic_cat *next;
133 } mls_semantic_cat_t;
134
135 typedef struct mls_semantic_level {
136 uint32_t sens;
137 mls_semantic_cat_t *cat;
138 } mls_semantic_level_t;
139
140 typedef struct mls_semantic_range {
141 mls_semantic_level_t level[2];
142 } mls_semantic_range_t;
143
144 extern void mls_semantic_cat_init(mls_semantic_cat_t *c);
145 extern void mls_semantic_cat_destroy(mls_semantic_cat_t *c);
146 extern void mls_semantic_level_init(mls_semantic_level_t *l);
147 extern void mls_semantic_level_destroy(mls_semantic_level_t *l);
148 extern int mls_semantic_level_cpy(mls_semantic_level_t *dst, mls_semantic_level_t *src);
149 extern void mls_semantic_range_init(mls_semantic_range_t *r);
150 extern void mls_semantic_range_destroy(mls_semantic_range_t *r);
151 extern int mls_semantic_range_cpy(mls_semantic_range_t *dst, mls_semantic_range_t *src);
152
153 #endif
154