373 lines
9.9 KiB
C
373 lines
9.9 KiB
C
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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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* Author : Stephen Smalley, <sds@epoch.ncsc.mil>
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*/
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/*
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* Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
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*
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* Support for enhanced MLS infrastructure.
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*
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* Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
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*
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* Added conditional policy language extensions
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*
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* Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
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* Copyright (C) 2003 - 2004 Tresys Technology, LLC
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2.
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*/
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#ifndef _SS_POLICYDB_H_
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#define _SS_POLICYDB_H_
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#include <linux/flex_array.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 "ebitmap.h"
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#include "mls_types.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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struct perm_datum {
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u32 value; /* permission bit + 1 */
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};
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/* Attributes of a common prefix for access vectors */
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struct common_datum {
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u32 value; /* internal common value */
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struct symtab permissions; /* common permissions */
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};
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/* Class attributes */
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struct class_datum {
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u32 value; /* class value */
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char *comkey; /* common name */
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struct common_datum *comdatum; /* common datum */
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struct symtab permissions; /* class-specific permission symbol table */
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struct constraint_node *constraints; /* constraints on class permissions */
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struct constraint_node *validatetrans; /* special transition rules */
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/* Options how a new object user, role, and type should be decided */
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#define DEFAULT_SOURCE 1
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#define DEFAULT_TARGET 2
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char default_user;
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char default_role;
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char default_type;
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/* Options how a new object range should be decided */
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#define DEFAULT_SOURCE_LOW 1
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#define DEFAULT_SOURCE_HIGH 2
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#define DEFAULT_SOURCE_LOW_HIGH 3
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#define DEFAULT_TARGET_LOW 4
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#define DEFAULT_TARGET_HIGH 5
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#define DEFAULT_TARGET_LOW_HIGH 6
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char default_range;
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};
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/* Role attributes */
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struct role_datum {
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u32 value; /* internal role value */
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u32 bounds; /* boundary of role */
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struct ebitmap dominates; /* set of roles dominated by this role */
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struct ebitmap types; /* set of authorized types for role */
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};
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struct role_trans {
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u32 role; /* current role */
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u32 type; /* program executable type, or new object type */
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u32 tclass; /* process class, or new object class */
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u32 new_role; /* new role */
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struct role_trans *next;
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};
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struct filename_trans {
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u32 stype; /* current process */
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u32 ttype; /* parent dir context */
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u16 tclass; /* class of new object */
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const char *name; /* last path component */
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};
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struct filename_trans_datum {
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u32 otype; /* expected of new object */
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};
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struct role_allow {
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u32 role; /* current role */
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u32 new_role; /* new role */
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struct role_allow *next;
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};
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/* Type attributes */
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struct type_datum {
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u32 value; /* internal type value */
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u32 bounds; /* boundary of type */
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unsigned char primary; /* primary name? */
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unsigned char attribute;/* attribute ?*/
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};
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/* User attributes */
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struct user_datum {
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u32 value; /* internal user value */
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u32 bounds; /* bounds of user */
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struct ebitmap roles; /* set of authorized roles for user */
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struct mls_range range; /* MLS range (min - max) for user */
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struct mls_level dfltlevel; /* default login MLS level for user */
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};
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/* Sensitivity attributes */
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struct level_datum {
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struct mls_level *level; /* sensitivity and associated categories */
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unsigned char isalias; /* is this sensitivity an alias for another? */
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};
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/* Category attributes */
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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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};
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struct range_trans {
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u32 source_type;
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u32 target_type;
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u32 target_class;
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};
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/* Boolean data type */
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struct cond_bool_datum {
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__u32 value; /* internal type value */
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int state;
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};
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struct cond_node;
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/*
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* type set preserves data needed to determine constraint info from
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* policy source. This is not used by the kernel policy but allows
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* utilities such as audit2allow to determine constraint denials.
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*/
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struct type_set {
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struct ebitmap types;
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struct ebitmap negset;
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u32 flags;
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};
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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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struct ocontext {
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union {
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char *name; /* name of initial SID, fs, netif, fstype, path */
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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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struct {
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u32 addr[4];
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u32 mask[4];
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} node6; /* IPv6 node information */
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} u;
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union {
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u32 sclass; /* security class for genfs */
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u32 behavior; /* labeling behavior for fs_use */
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} v;
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struct context context[2]; /* security context(s) */
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u32 sid[2]; /* SID(s) */
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struct ocontext *next;
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};
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struct genfs {
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char *fstype;
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struct ocontext *head;
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struct genfs *next;
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};
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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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#define SYM_BOOLS 5
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#define SYM_LEVELS 6
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#define SYM_CATS 7
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#define SYM_NUM 8
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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_FSUSE 5 /* fs_use */
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#define OCON_NODE6 6 /* IPv6 nodes */
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#define OCON_NUM 7
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/* The policy database */
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struct policydb {
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int mls_enabled;
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int android_netlink_route;
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/* symbol tables */
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struct symtab 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_bools symtab[SYM_BOOLS]
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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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struct flex_array *sym_val_to_name[SYM_NUM];
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/* class, role, and user attributes indexed by (value - 1) */
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struct class_datum **class_val_to_struct;
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struct role_datum **role_val_to_struct;
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struct user_datum **user_val_to_struct;
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struct flex_array *type_val_to_struct_array;
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/* type enforcement access vectors and transitions */
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struct avtab te_avtab;
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/* role transitions */
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struct role_trans *role_tr;
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/* file transitions with the last path component */
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/* quickly exclude lookups when parent ttype has no rules */
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struct ebitmap filename_trans_ttypes;
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/* actual set of filename_trans rules */
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struct hashtab *filename_trans;
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/* bools indexed by (value - 1) */
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struct cond_bool_datum **bool_val_to_struct;
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/* type enforcement conditional access vectors and transitions */
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struct avtab te_cond_avtab;
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/* linked list indexing te_cond_avtab by conditional */
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struct cond_node *cond_list;
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/* role allows */
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struct role_allow *role_allow;
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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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struct ocontext *ocontexts[OCON_NUM];
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/* security contexts for files in filesystems that cannot support
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a persistent label mapping or use another
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fixed labeling behavior. */
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struct genfs *genfs;
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/* range transitions table (range_trans_key -> mls_range) */
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struct hashtab *range_tr;
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/* type -> attribute reverse mapping */
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struct flex_array *type_attr_map_array;
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struct ebitmap policycaps;
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struct ebitmap permissive_map;
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/* length of this policy when it was loaded */
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size_t len;
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unsigned int policyvers;
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unsigned int reject_unknown : 1;
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unsigned int allow_unknown : 1;
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u16 process_class;
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u32 process_trans_perms;
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};
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extern void policydb_destroy(struct policydb *p);
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extern int policydb_load_isids(struct policydb *p, struct sidtab *s);
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extern int policydb_context_isvalid(struct policydb *p, struct context *c);
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extern int policydb_class_isvalid(struct policydb *p, unsigned int class);
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extern int policydb_type_isvalid(struct policydb *p, unsigned int type);
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extern int policydb_role_isvalid(struct policydb *p, unsigned int role);
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extern int policydb_read(struct policydb *p, void *fp);
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extern int policydb_write(struct policydb *p, void *fp);
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#define PERM_SYMTAB_SIZE 32
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#define POLICYDB_CONFIG_MLS 1
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#define POLICYDB_CONFIG_ANDROID_NETLINK_ROUTE (1 << 31)
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/* the config flags related to unknown classes/perms are bits 2 and 3 */
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#define REJECT_UNKNOWN 0x00000002
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#define ALLOW_UNKNOWN 0x00000004
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#define OBJECT_R "object_r"
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#define OBJECT_R_VAL 1
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#define POLICYDB_MAGIC SELINUX_MAGIC
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#define POLICYDB_STRING "SE Linux"
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struct policy_file {
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char *data;
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size_t len;
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};
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struct policy_data {
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struct policydb *p;
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void *fp;
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};
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static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes)
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{
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if (bytes > fp->len)
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return -EINVAL;
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memcpy(buf, fp->data, bytes);
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fp->data += bytes;
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fp->len -= bytes;
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return 0;
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}
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static inline int put_entry(const void *buf, size_t bytes, int num, struct policy_file *fp)
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{
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size_t len = bytes * num;
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memcpy(fp->data, buf, len);
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fp->data += len;
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fp->len -= len;
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return 0;
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}
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static inline char *sym_name(struct policydb *p, unsigned int sym_num, unsigned int element_nr)
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{
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struct flex_array *fa = p->sym_val_to_name[sym_num];
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return flex_array_get_ptr(fa, element_nr);
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}
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extern u16 string_to_security_class(struct policydb *p, const char *name);
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extern u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name);
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#endif /* _SS_POLICYDB_H_ */
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