mirror of https://github.com/dzavalishin/oskit/
260 lines
7.8 KiB
C
Executable File
260 lines
7.8 KiB
C
Executable File
/* FLASK */
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/*
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* Copyright (c) 1999, 2000 The University of Utah and the Flux Group.
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* All rights reserved.
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*
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* Contributed by the Computer Security Research division,
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* INFOSEC Research and Technology Office, NSA.
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*
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* This file is part of the Flux OSKit. The OSKit is free software, also known
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* as "open source;" you can redistribute it and/or modify it under the terms
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* of the GNU General Public License (GPL), version 2, as published by the Free
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* Software Foundation (FSF). To explore alternate licensing terms, contact
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* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
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*
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* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
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* received a copy of the GPL along with the OSKit; see the file COPYING. If
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* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
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*/
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/*
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* A policy database (policydb) specifies the
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* configuration data for the security policy.
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*/
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#ifndef _POLICYDB_H_
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#define _POLICYDB_H_
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#include "symtab.h"
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#include "avtab.h"
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#include "sidtab.h"
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#include "context.h"
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#include "constraint.h"
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/*
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* A datum type is defined for each kind of symbol
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* in the configuration data: individual permissions,
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* common prefixes for access vectors, classes,
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* users, roles, types, sensitivities, categories, etc.
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*/
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/* Permission attributes */
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typedef struct perm_datum {
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__u32 value; /* permission bit + 1 */
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#ifdef CONFIG_FLASK_MLS
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#define MLS_BASE_READ 1 /* MLS base permission `read' */
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#define MLS_BASE_WRITE 2 /* MLS base permission `write' */
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#define MLS_BASE_READBY 4 /* MLS base permission `readby' */
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#define MLS_BASE_WRITEBY 8 /* MLS base permission `writeby' */
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__u32 base_perms; /* MLS base permission mask */
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#endif
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} perm_datum_t;
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/* Attributes of a common prefix for access vectors */
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typedef struct common_datum {
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__u32 value; /* internal common value */
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symtab_t permissions; /* common permissions */
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} common_datum_t;
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/* Class attributes */
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typedef struct class_datum {
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__u32 value; /* class value */
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char *comkey; /* common name */
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common_datum_t *comdatum; /* common datum */
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symtab_t permissions; /* class-specific permission symbol table */
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constraint_node_t *constraints; /* constraints on class permissions */
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#ifdef CONFIG_FLASK_MLS
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mls_perms_t mlsperms; /* MLS base permission masks */
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#endif
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} class_datum_t;
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/* Role attributes */
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typedef struct role_datum {
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__u32 value; /* internal role value */
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ebitmap_t dominates; /* set of roles dominated by this role */
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ebitmap_t types; /* set of authorized types for role */
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} role_datum_t;
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/* Type attributes */
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typedef struct type_datum {
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__u32 value; /* internal type value */
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unsigned char isalias; /* is this type an alias for another? */
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} type_datum_t;
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/* User attributes */
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typedef struct user_datum {
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__u32 value; /* internal user value */
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ebitmap_t roles; /* set of authorized roles for user */
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#ifdef CONFIG_FLASK_MLS
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mls_range_list_t *ranges; /* list of authorized MLS ranges for user */
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#endif
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} user_datum_t;
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#ifdef CONFIG_FLASK_MLS
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/* Sensitivity attributes */
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typedef struct level_datum {
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mls_level_t *level; /* sensitivity and associated categories */
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unsigned char isalias; /* is this sensitivity an alias for another? */
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} level_datum_t;
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/* Category attributes */
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typedef struct cat_datum {
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__u32 value; /* internal category bit + 1 */
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unsigned char isalias; /* is this category an alias for another? */
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} cat_datum_t;
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#endif
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/*
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* The type enforcement configuration specifies default behaviors
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* for permissions that are not explicitly specified in the
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* type enforcement tables. This structure stores the default
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* for a single kind of access vector (allow, auditallow, auditdeny,
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* or notify). The default may be none, all or self. A set of
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* security classes may be excluded from the default behavior,
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* in which case their permissions will default to none.
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*/
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typedef struct te_def {
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#define TE_DEF_NONE 0
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#define TE_DEF_ALL 1
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#define TE_DEF_SELF 2
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__u32 value; /* none, all or self */
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ebitmap_t exclude; /* set of classes that are excluded */
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} te_def_t;
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/*
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* The configuration data includes security contexts for
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* initial SIDs, unlabeled file systems, TCP and UDP port numbers,
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* network interfaces, and nodes. This structure stores the
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* relevant data for one such entry. Entries of the same kind
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* (e.g. all initial SIDs) are linked together into a list.
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*/
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typedef struct ocontext {
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union {
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char *name; /* name of initial SID, fs or netif */
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struct {
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__u8 protocol;
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__u16 low_port;
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__u16 high_port;
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} port; /* TCP or UDP port information */
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struct {
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__u32 addr;
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__u32 mask;
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} node; /* node information */
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} u;
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context_struct_t context[2]; /* security context(s) */
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security_id_t sid[2]; /* SID(s) */
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struct ocontext *next;
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} ocontext_t;
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/* symbol table array indices */
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#define SYM_COMMONS 0
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#define SYM_CLASSES 1
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#define SYM_ROLES 2
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#define SYM_TYPES 3
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#define SYM_USERS 4
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#ifdef CONFIG_FLASK_MLS
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#define SYM_LEVELS 5
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#define SYM_CATS 6
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#define SYM_NUM 7
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#else
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#define SYM_NUM 5
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#endif
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/* type enforcement default array indices */
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#define TED_ALLOWED 0
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#define TED_AUDITALLOW 1
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#define TED_AUDITDENY 2
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#define TED_NOTIFY 3
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#define TED_NUM 4
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/* object context array indices */
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#define OCON_ISID 0 /* initial SIDs */
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#define OCON_FS 1 /* unlabeled file systems */
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#define OCON_PORT 2 /* TCP and UDP port numbers */
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#define OCON_NETIF 3 /* network interfaces */
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#define OCON_NODE 4 /* nodes */
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#define OCON_NUM 5
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/* The policy database */
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typedef struct policydb {
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/* symbol tables */
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symtab_t symtab[SYM_NUM];
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#define p_commons symtab[SYM_COMMONS]
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#define p_classes symtab[SYM_CLASSES]
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#define p_roles symtab[SYM_ROLES]
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#define p_types symtab[SYM_TYPES]
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#define p_users symtab[SYM_USERS]
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#define p_levels symtab[SYM_LEVELS]
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#define p_cats symtab[SYM_CATS]
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/* symbol names indexed by (value - 1) */
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char **sym_val_to_name[SYM_NUM];
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#define p_common_val_to_name sym_val_to_name[SYM_COMMONS]
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#define p_class_val_to_name sym_val_to_name[SYM_CLASSES]
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#define p_role_val_to_name sym_val_to_name[SYM_ROLES]
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#define p_type_val_to_name sym_val_to_name[SYM_TYPES]
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#define p_user_val_to_name sym_val_to_name[SYM_USERS]
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#define p_sens_val_to_name sym_val_to_name[SYM_LEVELS]
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#define p_cat_val_to_name sym_val_to_name[SYM_CATS]
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/* class, role, and user attributes indexed by (value - 1) */
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class_datum_t **class_val_to_struct;
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role_datum_t **role_val_to_struct;
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user_datum_t **user_val_to_struct;
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/* type enforcement defaults */
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te_def_t te_def[TED_NUM];
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#define p_te_def_allowed te_def[TED_ALLOWED]
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#define p_te_def_auditallow te_def[TED_AUDITALLOW]
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#define p_te_def_auditdeny te_def[TED_AUDITDENY]
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#define p_te_def_notify te_def[TED_NOTIFY]
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/* type enforcement access vectors and transitions */
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avtab_t te_avtab;
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/* security contexts of initial SIDs, unlabeled file systems,
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TCP or UDP port numbers, network interfaces, and nodes */
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ocontext_t *ocontexts[OCON_NUM];
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#ifdef CONFIG_FLASK_MLS
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/* number of legitimate MLS levels */
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__u32 nlevels;
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#endif
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} policydb_t;
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extern int policydb_init(policydb_t * p);
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extern int policydb_index_classes(policydb_t * p);
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extern int policydb_index_others(policydb_t * p);
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extern int constraint_expr_destroy(constraint_expr_t * expr);
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extern void policydb_destroy(policydb_t * p);
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extern int policydb_load_isids(policydb_t *p, sidtab_t *s);
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extern int policydb_context_isvalid(policydb_t *p, context_struct_t *c);
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extern int policydb_read(policydb_t * p, FILE * fp);
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#ifndef __KERNEL__
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int policydb_write(policydb_t * p, FILE * fp);
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#endif
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#define POLICYDB_VERSION 1
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#define POLICYDB_CONFIG_MLS 1
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#define POLICYDB_CONFIG_AUDIT 2
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#define POLICYDB_CONFIG_NOTIFY 4
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#endif /* _POLICYDB_H_ */
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/* FLASK */
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