linux/security/selinux/ss/conditional.h
Christian Göttsche 581646c3fb selinux: constify source policy in cond_policydb_dup()
cond_policydb_dup() duplicates conditional parts of an existing policy.
Declare the source policy const, since it should not be modified.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
[PM: various line length fixups]
Signed-off-by: Paul Moore <paul@paul-moore.com>
2024-04-30 19:01:04 -04:00

85 lines
2.4 KiB
C

/* SPDX-License-Identifier: GPL-2.0-only */
/* Authors: Karl MacMillan <kmacmillan@tresys.com>
* Frank Mayer <mayerf@tresys.com>
* Copyright (C) 2003 - 2004 Tresys Technology, LLC
*/
#ifndef _CONDITIONAL_H_
#define _CONDITIONAL_H_
#include "avtab.h"
#include "symtab.h"
#include "policydb.h"
#include "../include/conditional.h"
#define COND_EXPR_MAXDEPTH 10
/*
* A conditional expression is a list of operators and operands
* in reverse polish notation.
*/
struct cond_expr_node {
#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
u32 expr_type;
u32 boolean;
};
struct cond_expr {
struct cond_expr_node *nodes;
u32 len;
};
/*
* Each cond_node contains a list of rules to be enabled/disabled
* depending on the current value of the conditional expression. This
* struct is for that list.
*/
struct cond_av_list {
struct avtab_node **nodes;
u32 len;
};
/*
* 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)..
*/
struct cond_node {
int cur_state;
struct cond_expr expr;
struct cond_av_list true_list;
struct cond_av_list false_list;
};
void cond_policydb_init(struct policydb *p);
void cond_policydb_destroy(struct policydb *p);
int cond_init_bool_indexes(struct policydb *p);
int cond_destroy_bool(void *key, void *datum, void *p);
int cond_index_bool(void *key, void *datum, void *datap);
int cond_read_bool(struct policydb *p, struct symtab *s, void *fp);
int cond_read_list(struct policydb *p, void *fp);
int cond_write_bool(void *key, void *datum, void *ptr);
int cond_write_list(struct policydb *p, void *fp);
void cond_compute_av(struct avtab *ctab, struct avtab_key *key,
struct av_decision *avd, struct extended_perms *xperms);
void cond_compute_xperms(struct avtab *ctab, struct avtab_key *key,
struct extended_perms_decision *xpermd);
void evaluate_cond_nodes(struct policydb *p);
void cond_policydb_destroy_dup(struct policydb *p);
int cond_policydb_dup(struct policydb *new, const struct policydb *orig);
#endif /* _CONDITIONAL_H_ */