135 lines
4.5 KiB
C
135 lines
4.5 KiB
C
/* Authors: Karl MacMillan <kmacmillan@tresys.com>
|
|
* Frank Mayer <mayerf@tresys.com>
|
|
*
|
|
* Copyright (C) 2003 - 2005 Tresys Technology, LLC
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef _SEPOL_POLICYDB_CONDITIONAL_H_
|
|
#define _SEPOL_POLICYDB_CONDITIONAL_H_
|
|
|
|
#include <sepol/policydb/flask_types.h>
|
|
#include <sepol/policydb/avtab.h>
|
|
#include <sepol/policydb/symtab.h>
|
|
#include <sepol/policydb/policydb.h>
|
|
|
|
#define COND_EXPR_MAXDEPTH 10
|
|
|
|
/* this is the max unique bools in a conditional expression
|
|
* for which we precompute all outcomes for the expression.
|
|
*
|
|
* NOTE - do _NOT_ use value greater than 5 because
|
|
* cond_node_t->expr_pre_comp can only hold at most 32 values
|
|
*/
|
|
#define COND_MAX_BOOLS 5
|
|
|
|
/*
|
|
* A conditional expression is a list of operators and operands
|
|
* in reverse polish notation.
|
|
*/
|
|
typedef struct cond_expr {
|
|
#define COND_BOOL 1 /* plain bool */
|
|
#define COND_NOT 2 /* !bool */
|
|
#define COND_OR 3 /* bool || bool */
|
|
#define COND_AND 4 /* bool && bool */
|
|
#define COND_XOR 5 /* bool ^ bool */
|
|
#define COND_EQ 6 /* bool == bool */
|
|
#define COND_NEQ 7 /* bool != bool */
|
|
#define COND_LAST COND_NEQ
|
|
uint32_t expr_type;
|
|
uint32_t bool;
|
|
struct cond_expr *next;
|
|
} cond_expr_t;
|
|
|
|
/*
|
|
* Each cond_node_t contains a list of rules to be enabled/disabled
|
|
* depending on the current value of the conditional expression. This
|
|
* struct is for that list.
|
|
*/
|
|
typedef struct cond_av_list {
|
|
avtab_ptr_t node;
|
|
struct cond_av_list *next;
|
|
} cond_av_list_t;
|
|
|
|
/*
|
|
* A cond node represents a conditional block in a policy. It
|
|
* contains a conditional expression, the current state of the expression,
|
|
* two lists of rules to enable/disable depending on the value of the
|
|
* expression (the true list corresponds to if and the false list corresponds
|
|
* to else)..
|
|
*/
|
|
typedef struct cond_node {
|
|
int cur_state;
|
|
cond_expr_t *expr;
|
|
/* these true/false lists point into te_avtab when that is used */
|
|
cond_av_list_t *true_list;
|
|
cond_av_list_t *false_list;
|
|
/* and these are using during parsing and for modules */
|
|
avrule_t *avtrue_list;
|
|
avrule_t *avfalse_list;
|
|
/* these fields are not written to binary policy */
|
|
unsigned int nbools;
|
|
uint32_t bool_ids[COND_MAX_BOOLS];
|
|
uint32_t expr_pre_comp;
|
|
/* */
|
|
struct cond_node *next;
|
|
} cond_node_t;
|
|
|
|
extern int cond_evaluate_expr(policydb_t * p, cond_expr_t * expr);
|
|
extern cond_expr_t *cond_copy_expr(cond_expr_t * expr);
|
|
|
|
extern int cond_expr_equal(cond_node_t * a, cond_node_t * b);
|
|
extern int cond_normalize_expr(policydb_t * p, cond_node_t * cn);
|
|
extern void cond_node_destroy(cond_node_t * node);
|
|
extern void cond_expr_destroy(cond_expr_t * expr);
|
|
|
|
extern cond_node_t *cond_node_find(policydb_t * p,
|
|
cond_node_t * needle, cond_node_t * haystack,
|
|
int *was_created);
|
|
|
|
extern cond_node_t *cond_node_create(policydb_t * p, cond_node_t * node);
|
|
|
|
extern cond_node_t *cond_node_search(policydb_t * p, cond_node_t * list,
|
|
cond_node_t * cn);
|
|
|
|
extern int evaluate_conds(policydb_t * p);
|
|
|
|
extern avtab_datum_t *cond_av_list_search(avtab_key_t * key,
|
|
cond_av_list_t * cond_list);
|
|
|
|
extern void cond_av_list_destroy(cond_av_list_t * list);
|
|
|
|
extern void cond_optimize_lists(cond_list_t * cl);
|
|
|
|
extern int cond_policydb_init(policydb_t * p);
|
|
extern void cond_policydb_destroy(policydb_t * p);
|
|
extern void cond_list_destroy(cond_list_t * list);
|
|
|
|
extern int cond_init_bool_indexes(policydb_t * p);
|
|
extern int cond_destroy_bool(hashtab_key_t key, hashtab_datum_t datum, void *p);
|
|
|
|
extern int cond_index_bool(hashtab_key_t key, hashtab_datum_t datum,
|
|
void *datap);
|
|
|
|
extern int cond_read_bool(policydb_t * p, hashtab_t h, struct policy_file *fp);
|
|
|
|
extern int cond_read_list(policydb_t * p, cond_list_t ** list, void *fp);
|
|
|
|
extern void cond_compute_av(avtab_t * ctab, avtab_key_t * key,
|
|
struct sepol_av_decision *avd);
|
|
|
|
#endif /* _CONDITIONAL_H_ */
|