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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 */
51 	struct type_set *type_names;
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_ */
63