1 /* Author : Stephen Smalley, <sds (at) epoch.ncsc.mil> */ 2 3 /* FLASK */ 4 5 /* 6 * A constraint is a condition that must be satisfied in 7 * order for one or more permissions to be granted. 8 * Constraints are used to impose additional restrictions 9 * beyond the type-based rules in `te' or the role-based 10 * transition rules in `rbac'. Constraints are typically 11 * used to prevent a process from transitioning to a new user 12 * identity or role unless it is in a privileged type. 13 * Constraints are likewise typically used to prevent a 14 * process from labeling an object with a different user 15 * identity. 16 */ 17 18 #ifndef _SEPOL_POLICYDB_CONSTRAINT_H_ 19 #define _SEPOL_POLICYDB_CONSTRAINT_H_ 20 21 #include <sepol/policydb/policydb.h> 22 #include <sepol/policydb/ebitmap.h> 23 #include <sepol/policydb/flask_types.h> 24 25 __BEGIN_DECLS 26 27 #define CEXPR_MAXDEPTH 5 28 29 struct type_set; 30 31 typedef struct constraint_expr { 32 #define CEXPR_NOT 1 /* not expr */ 33 #define CEXPR_AND 2 /* expr and expr */ 34 #define CEXPR_OR 3 /* expr or expr */ 35 #define CEXPR_ATTR 4 /* attr op attr */ 36 #define CEXPR_NAMES 5 /* attr op names */ 37 uint32_t expr_type; /* expression type */ 38 39 #define CEXPR_USER 1 /* user */ 40 #define CEXPR_ROLE 2 /* role */ 41 #define CEXPR_TYPE 4 /* type */ 42 #define CEXPR_TARGET 8 /* target if set, source otherwise */ 43 #define CEXPR_XTARGET 16 /* special 3rd target for validatetrans rule */ 44 #define CEXPR_L1L2 32 /* low level 1 vs. low level 2 */ 45 #define CEXPR_L1H2 64 /* low level 1 vs. high level 2 */ 46 #define CEXPR_H1L2 128 /* high level 1 vs. low level 2 */ 47 #define CEXPR_H1H2 256 /* high level 1 vs. high level 2 */ 48 #define CEXPR_L1H1 512 /* low level 1 vs. high level 1 */ 49 #define CEXPR_L2H2 1024 /* low level 2 vs. high level 2 */ 50 uint32_t attr; /* attribute */ 51 52 #define CEXPR_EQ 1 /* == or eq */ 53 #define CEXPR_NEQ 2 /* != */ 54 #define CEXPR_DOM 3 /* dom */ 55 #define CEXPR_DOMBY 4 /* domby */ 56 #define CEXPR_INCOMP 5 /* incomp */ 57 uint32_t op; /* operator */ 58 59 ebitmap_t names; /* names */ 60 struct type_set *type_names; 61 62 struct constraint_expr *next; /* next expression */ 63 } constraint_expr_t; 64 65 typedef struct constraint_node { 66 sepol_access_vector_t permissions; /* constrained permissions */ 67 constraint_expr_t *expr; /* constraint on permissions */ 68 struct constraint_node *next; /* next constraint */ 69 } constraint_node_t; 70 71 struct policydb; 72 73 extern int constraint_expr_init(constraint_expr_t * expr); 74 extern void constraint_expr_destroy(constraint_expr_t * expr); 75 76 __END_DECLS 77 #endif /* _CONSTRAINT_H_ */ 78 79 /* FLASK */ 80
