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1da177e4 LT |
1 | /* |
2 | * A constraint is a condition that must be satisfied in | |
3 | * order for one or more permissions to be granted. | |
4 | * Constraints are used to impose additional restrictions | |
5 | * beyond the type-based rules in `te' or the role-based | |
6 | * transition rules in `rbac'. Constraints are typically | |
7 | * used to prevent a process from transitioning to a new user | |
8 | * identity or role unless it is in a privileged type. | |
9 | * Constraints are likewise typically used to prevent a | |
10 | * process from labeling an object with a different user | |
11 | * identity. | |
12 | * | |
13 | * Author : Stephen Smalley, <sds@epoch.ncsc.mil> | |
14 | */ | |
15 | #ifndef _SS_CONSTRAINT_H_ | |
16 | #define _SS_CONSTRAINT_H_ | |
17 | ||
18 | #include "ebitmap.h" | |
19 | ||
20 | #define CEXPR_MAXDEPTH 5 | |
21 | ||
22 | struct constraint_expr { | |
23 | #define CEXPR_NOT 1 /* not expr */ | |
24 | #define CEXPR_AND 2 /* expr and expr */ | |
25 | #define CEXPR_OR 3 /* expr or expr */ | |
26 | #define CEXPR_ATTR 4 /* attr op attr */ | |
27 | #define CEXPR_NAMES 5 /* attr op names */ | |
28 | u32 expr_type; /* expression type */ | |
29 | ||
30 | #define CEXPR_USER 1 /* user */ | |
31 | #define CEXPR_ROLE 2 /* role */ | |
32 | #define CEXPR_TYPE 4 /* type */ | |
33 | #define CEXPR_TARGET 8 /* target if set, source otherwise */ | |
34 | #define CEXPR_XTARGET 16 /* special 3rd target for validatetrans rule */ | |
35 | #define CEXPR_L1L2 32 /* low level 1 vs. low level 2 */ | |
36 | #define CEXPR_L1H2 64 /* low level 1 vs. high level 2 */ | |
37 | #define CEXPR_H1L2 128 /* high level 1 vs. low level 2 */ | |
38 | #define CEXPR_H1H2 256 /* high level 1 vs. high level 2 */ | |
39 | #define CEXPR_L1H1 512 /* low level 1 vs. high level 1 */ | |
40 | #define CEXPR_L2H2 1024 /* low level 2 vs. high level 2 */ | |
41 | u32 attr; /* attribute */ | |
42 | ||
43 | #define CEXPR_EQ 1 /* == or eq */ | |
44 | #define CEXPR_NEQ 2 /* != */ | |
45 | #define CEXPR_DOM 3 /* dom */ | |
46 | #define CEXPR_DOMBY 4 /* domby */ | |
47 | #define CEXPR_INCOMP 5 /* incomp */ | |
48 | u32 op; /* operator */ | |
49 | ||
50 | struct ebitmap names; /* names */ | |
a660bec1 | 51 | struct type_set *type_names; |
1da177e4 LT |
52 | |
53 | struct constraint_expr *next; /* next expression */ | |
54 | }; | |
55 | ||
56 | struct constraint_node { | |
57 | u32 permissions; /* constrained permissions */ | |
58 | struct constraint_expr *expr; /* constraint on permissions */ | |
59 | struct constraint_node *next; /* next constraint */ | |
60 | }; | |
61 | ||
62 | #endif /* _SS_CONSTRAINT_H_ */ |