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145 lines
4.6 KiB
145 lines
4.6 KiB
/* Authors: Karl MacMillan <kmacmillan@tresys.com>
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* Frank Mayer <mayerf@tresys.com>
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*
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* Copyright (C) 2003 - 2005 Tresys Technology, LLC
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _SEPOL_POLICYDB_CONDITIONAL_H_
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#define _SEPOL_POLICYDB_CONDITIONAL_H_
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#include <sepol/policydb/flask_types.h>
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#include <sepol/policydb/avtab.h>
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#include <sepol/policydb/symtab.h>
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#include <sepol/policydb/policydb.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define COND_EXPR_MAXDEPTH 10
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/* this is the max unique bools in a conditional expression
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* for which we precompute all outcomes for the expression.
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*
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* NOTE - do _NOT_ use value greater than 5 because
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* cond_node_t->expr_pre_comp can only hold at most 32 values
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*/
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#define COND_MAX_BOOLS 5
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/*
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* A conditional expression is a list of operators and operands
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* in reverse polish notation.
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*/
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typedef struct cond_expr {
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#define COND_BOOL 1 /* plain bool */
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#define COND_NOT 2 /* !bool */
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#define COND_OR 3 /* bool || bool */
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#define COND_AND 4 /* bool && bool */
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#define COND_XOR 5 /* bool ^ bool */
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#define COND_EQ 6 /* bool == bool */
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#define COND_NEQ 7 /* bool != bool */
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#define COND_LAST COND_NEQ
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uint32_t expr_type;
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uint32_t bool;
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struct cond_expr *next;
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} cond_expr_t;
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/*
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* Each cond_node_t contains a list of rules to be enabled/disabled
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* depending on the current value of the conditional expression. This
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* struct is for that list.
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*/
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typedef struct cond_av_list {
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avtab_ptr_t node;
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struct cond_av_list *next;
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} cond_av_list_t;
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/*
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* A cond node represents a conditional block in a policy. It
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* contains a conditional expression, the current state of the expression,
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* two lists of rules to enable/disable depending on the value of the
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* expression (the true list corresponds to if and the false list corresponds
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* to else)..
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*/
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typedef struct cond_node {
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int cur_state;
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cond_expr_t *expr;
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/* these true/false lists point into te_avtab when that is used */
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cond_av_list_t *true_list;
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cond_av_list_t *false_list;
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/* and these are used during parsing and for modules */
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avrule_t *avtrue_list;
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avrule_t *avfalse_list;
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/* these fields are not written to binary policy */
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unsigned int nbools;
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uint32_t bool_ids[COND_MAX_BOOLS];
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uint32_t expr_pre_comp;
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struct cond_node *next;
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/* a tunable conditional, calculated and used at expansion */
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#define COND_NODE_FLAGS_TUNABLE 0x01
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uint32_t flags;
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} cond_node_t;
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extern int cond_evaluate_expr(policydb_t * p, cond_expr_t * expr);
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extern cond_expr_t *cond_copy_expr(cond_expr_t * expr);
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extern int cond_expr_equal(cond_node_t * a, cond_node_t * b);
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extern int cond_normalize_expr(policydb_t * p, cond_node_t * cn);
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extern void cond_node_destroy(cond_node_t * node);
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extern void cond_expr_destroy(cond_expr_t * expr);
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extern cond_node_t *cond_node_find(policydb_t * p,
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cond_node_t * needle, cond_node_t * haystack,
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int *was_created);
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extern cond_node_t *cond_node_create(policydb_t * p, cond_node_t * node);
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extern cond_node_t *cond_node_search(policydb_t * p, cond_node_t * list,
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cond_node_t * cn);
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extern int evaluate_conds(policydb_t * p);
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extern avtab_datum_t *cond_av_list_search(avtab_key_t * key,
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cond_av_list_t * cond_list);
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extern void cond_av_list_destroy(cond_av_list_t * list);
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extern void cond_optimize_lists(cond_list_t * cl);
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extern int cond_policydb_init(policydb_t * p);
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extern void cond_policydb_destroy(policydb_t * p);
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extern void cond_list_destroy(cond_list_t * list);
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extern int cond_init_bool_indexes(policydb_t * p);
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extern int cond_destroy_bool(hashtab_key_t key, hashtab_datum_t datum, void *p);
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extern int cond_index_bool(hashtab_key_t key, hashtab_datum_t datum,
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void *datap);
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extern int cond_read_bool(policydb_t * p, hashtab_t h, struct policy_file *fp);
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extern int cond_read_list(policydb_t * p, cond_list_t ** list, void *fp);
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extern void cond_compute_av(avtab_t * ctab, avtab_key_t * key,
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struct sepol_av_decision *avd);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _CONDITIONAL_H_ */
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