1
2 /* Author : Stephen Smalley, <sds@epoch.ncsc.mil> */
3
4 /* FLASK */
5
6 /*
7 * A security context is a set of security attributes
8 * associated with each subject and object controlled
9 * by the security policy. Security contexts are
10 * externally represented as variable-length strings
11 * that can be interpreted by a user or application
12 * with an understanding of the security policy.
13 * Internally, the security server uses a simple
14 * structure. This structure is private to the
15 * security server and can be changed without affecting
16 * clients of the security server.
17 */
18
19 #ifndef _SEPOL_POLICYDB_CONTEXT_H_
20 #define _SEPOL_POLICYDB_CONTEXT_H_
21
22 #include <stddef.h>
23 #include <sepol/policydb/ebitmap.h>
24 #include <sepol/policydb/mls_types.h>
25
26 /*
27 * A security context consists of an authenticated user
28 * identity, a role, a type and a MLS range.
29 */
30 typedef struct context_struct {
31 uint32_t user;
32 uint32_t role;
33 uint32_t type;
34 mls_range_t range;
35 } context_struct_t;
36
mls_context_init(context_struct_t * c)37 static inline void mls_context_init(context_struct_t * c)
38 {
39 mls_range_init(&c->range);
40 }
41
mls_context_cpy(context_struct_t * dst,context_struct_t * src)42 static inline int mls_context_cpy(context_struct_t * dst,
43 context_struct_t * src)
44 {
45
46 if (mls_range_cpy(&dst->range, &src->range) < 0)
47 return -1;
48
49 return 0;
50 }
51
mls_context_cmp(context_struct_t * c1,context_struct_t * c2)52 static inline int mls_context_cmp(context_struct_t * c1, context_struct_t * c2)
53 {
54 return (mls_level_eq(&c1->range.level[0], &c2->range.level[0]) &&
55 mls_level_eq(&c1->range.level[1], &c2->range.level[1]));
56
57 }
58
mls_context_destroy(context_struct_t * c)59 static inline void mls_context_destroy(context_struct_t * c)
60 {
61 if (c == NULL)
62 return;
63
64 mls_range_destroy(&c->range);
65 mls_context_init(c);
66 }
67
context_init(context_struct_t * c)68 static inline void context_init(context_struct_t * c)
69 {
70 memset(c, 0, sizeof(*c));
71 }
72
context_cpy(context_struct_t * dst,context_struct_t * src)73 static inline int context_cpy(context_struct_t * dst, context_struct_t * src)
74 {
75 dst->user = src->user;
76 dst->role = src->role;
77 dst->type = src->type;
78 return mls_context_cpy(dst, src);
79 }
80
context_destroy(context_struct_t * c)81 static inline void context_destroy(context_struct_t * c)
82 {
83 if (c == NULL)
84 return;
85
86 c->user = c->role = c->type = 0;
87 mls_context_destroy(c);
88 }
89
context_cmp(context_struct_t * c1,context_struct_t * c2)90 static inline int context_cmp(context_struct_t * c1, context_struct_t * c2)
91 {
92 return ((c1->user == c2->user) &&
93 (c1->role == c2->role) &&
94 (c1->type == c2->type) && mls_context_cmp(c1, c2));
95 }
96
97 #endif
98