/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* A constraint is a condition that must be satisfied in
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* order for one or more permissions to be granted.
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* Constraints are used to impose additional restrictions
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* beyond the type-based rules in `te' or the role-based
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* transition rules in `rbac'. Constraints are typically
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* used to prevent a process from transitioning to a new user
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* identity or role unless it is in a privileged type.
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* Constraints are likewise typically used to prevent a
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* process from labeling an object with a different user
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* identity.
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*
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* Author : Stephen Smalley, <sds@tycho.nsa.gov>
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*/
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#ifndef _SS_CONSTRAINT_H_
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#define _SS_CONSTRAINT_H_
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#include "ebitmap.h"
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#define CEXPR_MAXDEPTH 5
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struct constraint_expr {
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#define CEXPR_NOT 1 /* not expr */
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#define CEXPR_AND 2 /* expr and expr */
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#define CEXPR_OR 3 /* expr or expr */
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#define CEXPR_ATTR 4 /* attr op attr */
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#define CEXPR_NAMES 5 /* attr op names */
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u32 expr_type; /* expression type */
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#define CEXPR_USER 1 /* user */
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#define CEXPR_ROLE 2 /* role */
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#define CEXPR_TYPE 4 /* type */
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#define CEXPR_TARGET 8 /* target if set, source otherwise */
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#define CEXPR_XTARGET 16 /* special 3rd target for validatetrans rule */
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#define CEXPR_L1L2 32 /* low level 1 vs. low level 2 */
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#define CEXPR_L1H2 64 /* low level 1 vs. high level 2 */
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#define CEXPR_H1L2 128 /* high level 1 vs. low level 2 */
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#define CEXPR_H1H2 256 /* high level 1 vs. high level 2 */
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#define CEXPR_L1H1 512 /* low level 1 vs. high level 1 */
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#define CEXPR_L2H2 1024 /* low level 2 vs. high level 2 */
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u32 attr; /* attribute */
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#define CEXPR_EQ 1 /* == or eq */
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#define CEXPR_NEQ 2 /* != */
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#define CEXPR_DOM 3 /* dom */
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#define CEXPR_DOMBY 4 /* domby */
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#define CEXPR_INCOMP 5 /* incomp */
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u32 op; /* operator */
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struct ebitmap names; /* names */
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struct type_set *type_names;
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struct constraint_expr *next; /* next expression */
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};
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struct constraint_node {
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u32 permissions; /* constrained permissions */
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struct constraint_expr *expr; /* constraint on permissions */
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struct constraint_node *next; /* next constraint */
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};
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#endif /* _SS_CONSTRAINT_H_ */
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