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