1 /* Author : Stephen Smalley, <sds@epoch.ncsc.mil> */
2 /*
3 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
4 *
5 * Support for enhanced MLS infrastructure.
6 *
7 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
8 *
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 /* FLASK */
25
26 /*
27 * Type definitions for the multi-level security (MLS) policy.
28 */
29
30 #ifndef _SEPOL_POLICYDB_MLS_TYPES_H_
31 #define _SEPOL_POLICYDB_MLS_TYPES_H_
32
33 #include <stdint.h>
34 #include <stdlib.h>
35 #include <sepol/policydb/ebitmap.h>
36 #include <sepol/policydb/flask_types.h>
37
38 #ifdef __cplusplus
39 extern "C" {
40 #endif
41
42 typedef struct mls_level {
43 uint32_t sens; /* sensitivity */
44 ebitmap_t cat; /* category set */
45 } mls_level_t;
46
47 typedef struct mls_range {
48 mls_level_t level[2]; /* low == level[0], high == level[1] */
49 } mls_range_t;
50
mls_level_cpy(struct mls_level * dst,struct mls_level * src)51 static inline int mls_level_cpy(struct mls_level *dst, struct mls_level *src)
52 {
53
54 dst->sens = src->sens;
55 if (ebitmap_cpy(&dst->cat, &src->cat) < 0)
56 return -1;
57 return 0;
58 }
59
mls_level_init(struct mls_level * level)60 static inline void mls_level_init(struct mls_level *level)
61 {
62
63 memset(level, 0, sizeof(mls_level_t));
64 }
65
mls_level_destroy(struct mls_level * level)66 static inline void mls_level_destroy(struct mls_level *level)
67 {
68
69 if (level == NULL)
70 return;
71
72 ebitmap_destroy(&level->cat);
73 mls_level_init(level);
74 }
75
mls_level_eq(const struct mls_level * l1,const struct mls_level * l2)76 static inline int mls_level_eq(const struct mls_level *l1, const struct mls_level *l2)
77 {
78 return ((l1->sens == l2->sens) && ebitmap_cmp(&l1->cat, &l2->cat));
79 }
80
mls_level_dom(const struct mls_level * l1,const struct mls_level * l2)81 static inline int mls_level_dom(const struct mls_level *l1, const struct mls_level *l2)
82 {
83 return ((l1->sens >= l2->sens) && ebitmap_contains(&l1->cat, &l2->cat));
84 }
85
86 #define mls_level_incomp(l1, l2) \
87 (!mls_level_dom((l1), (l2)) && !mls_level_dom((l2), (l1)))
88
89 #define mls_level_between(l1, l2, l3) \
90 (mls_level_dom((l1), (l2)) && mls_level_dom((l3), (l1)))
91
92 #define mls_range_contains(r1, r2) \
93 (mls_level_dom(&(r2).level[0], &(r1).level[0]) && \
94 mls_level_dom(&(r1).level[1], &(r2).level[1]))
95
mls_range_cpy(mls_range_t * dst,mls_range_t * src)96 static inline int mls_range_cpy(mls_range_t * dst, mls_range_t * src)
97 {
98
99 if (mls_level_cpy(&dst->level[0], &src->level[0]) < 0)
100 goto err;
101
102 if (mls_level_cpy(&dst->level[1], &src->level[1]) < 0)
103 goto err_destroy;
104
105 return 0;
106
107 err_destroy:
108 mls_level_destroy(&dst->level[0]);
109
110 err:
111 return -1;
112 }
113
mls_range_init(struct mls_range * r)114 static inline void mls_range_init(struct mls_range *r)
115 {
116 mls_level_init(&r->level[0]);
117 mls_level_init(&r->level[1]);
118 }
119
mls_range_destroy(struct mls_range * r)120 static inline void mls_range_destroy(struct mls_range *r)
121 {
122 mls_level_destroy(&r->level[0]);
123 mls_level_destroy(&r->level[1]);
124 }
125
mls_range_eq(struct mls_range * r1,struct mls_range * r2)126 static inline int mls_range_eq(struct mls_range *r1, struct mls_range *r2)
127 {
128 return (mls_level_eq(&r1->level[0], &r2->level[0]) &&
129 mls_level_eq(&r1->level[1], &r2->level[1]));
130 }
131
132 typedef struct mls_semantic_cat {
133 uint32_t low; /* first bit this struct represents */
134 uint32_t high; /* last bit represented - equals low for a single cat */
135 struct mls_semantic_cat *next;
136 } mls_semantic_cat_t;
137
138 typedef struct mls_semantic_level {
139 uint32_t sens;
140 mls_semantic_cat_t *cat;
141 } mls_semantic_level_t;
142
143 typedef struct mls_semantic_range {
144 mls_semantic_level_t level[2];
145 } mls_semantic_range_t;
146
147 extern void mls_semantic_cat_init(mls_semantic_cat_t *c);
148 extern void mls_semantic_cat_destroy(mls_semantic_cat_t *c);
149 extern void mls_semantic_level_init(mls_semantic_level_t *l);
150 extern void mls_semantic_level_destroy(mls_semantic_level_t *l);
151 extern int mls_semantic_level_cpy(mls_semantic_level_t *dst, mls_semantic_level_t *src);
152 extern void mls_semantic_range_init(mls_semantic_range_t *r);
153 extern void mls_semantic_range_destroy(mls_semantic_range_t *r);
154 extern int mls_semantic_range_cpy(mls_semantic_range_t *dst, mls_semantic_range_t *src);
155
156 #ifdef __cplusplus
157 }
158 #endif
159
160 #endif
161