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/**
* @file
*
* Provides a way for setools to expand policy.
*
* @author Jeremy A. Mowery jmowery@tresys.com
* @author Jason Tang jtang@tresys.com
*
* Copyright (C) 2006-2008 Tresys Technology, LLC
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include <sepol/policydb/expand.h>
#include <sepol/policydb.h>
#include <stdlib.h>
#include "qpol_internal.h"
#include "expand.h"
static int expand_type_attr_map(hashtab_key_t key __attribute__ ((unused)), hashtab_datum_t datum, void *ptr)
{
type_datum_t *type = NULL, *orig_type;
policydb_t *db = (policydb_t *) ptr;
ebitmap_node_t *node = NULL;
uint32_t bit = 0;
type = (type_datum_t *) datum;
/* if this is an attribute go through its list
* of types and put in reverse mappings */
if (type->flavor == TYPE_ATTRIB) {
ebitmap_for_each_bit(&type->types, node, bit) {
if (ebitmap_node_get_bit(node, bit)) {
orig_type = db->type_val_to_struct[bit];
if (ebitmap_set_bit(&orig_type->types, type->s.value - 1, 1)) {
return -1;
}
}
}
}
return 0;
}
static int expand_type_permissive_map(hashtab_key_t key __attribute__ ((unused)), hashtab_datum_t datum, void *ptr)
{
#ifdef HAVE_SEPOL_PERMISSIVE_TYPES
type_datum_t *type = (type_datum_t *) datum;
policydb_t *db = (policydb_t *) ptr;
type = (type_datum_t *) datum;
/* if this type is marked as permissive, then set its
corresponding bit in the permissive map. note that unlike
other bitmaps, this one does not subtract 1 in the
bitmap. */
if (type->flags & TYPE_FLAGS_PERMISSIVE) {
uint32_t value;
if (type->flavor == TYPE_ALIAS) {
/* aliases that came from modules should use the value
* referenced to by that alias */
value = type->primary;
} else {
value = type->s.value;
}
if (ebitmap_set_bit(&db->permissive_map, value, 1)) {
return -1;
}
}
#endif
return 0;
}
int qpol_expand_module(qpol_policy_t * base, int neverallows)
{
unsigned int i;
uint32_t *typemap = NULL, *boolmap = NULL, *rolemap = NULL, *usermap = NULL;
policydb_t *db;
int rt, error = 0;
INFO(base, "%s", "Expanding policy. (Step 3 of 5)");
if (base == NULL) {
ERR(base, "%s", strerror(EINVAL));
errno = EINVAL;
return -1;
}
db = &base->p->p;
/* activate the global branch before expansion */
db->global->branch_list->enabled = 1;
db->global->enabled = db->global->branch_list;
/* expand out the types to include all the attributes */
if (hashtab_map(db->p_types.table, expand_type_attr_map, (db))) {
error = errno;
ERR(base, "%s", "Error expanding attributes for types.");
goto err;
}
#ifdef HAVE_SEPOL_PERMISSIVE_TYPES
/* fill in the permissive types bitmap. this is normally done
* in type_copy_callback(), but types are not copied in
* expand_module_avrules() */
if (hashtab_map(db->p_types.table, expand_type_permissive_map, (db))) {
error = errno;
ERR(base, "%s", "Error expanding attributes for types.");
goto err;
}
#endif
/* Build the typemap such that we can expand into the same policy */
typemap = (uint32_t *) calloc(db->p_types.nprim, sizeof(uint32_t));
if (typemap == NULL) {
error = errno;
ERR(base, "%s", strerror(errno));
goto err;
}
for (i = 0; i < db->p_types.nprim; i++) {
typemap[i] = i + 1;
}
#ifdef HAVE_SEPOL_BOOLMAP
boolmap = (uint32_t *) calloc(db->p_bools.nprim, sizeof(uint32_t));
if (boolmap == NULL) {
error = errno;
ERR(base, "%s", strerror(errno));
goto err;
}
for (i = 0; i < db->p_bools.nprim; i++) {
boolmap[i] = i + 1;
}
#ifdef HAVE_SEPOL_USER_ROLE_MAPPING
rolemap = (uint32_t *) calloc(db->p_roles.nprim, sizeof(uint32_t));
if (rolemap == NULL) {
error = errno;
ERR(base, "%s", strerror(errno));
goto err;
}
for (i = 0; i < db->p_roles.nprim; i++) {
rolemap[i] = i + 1;
}
usermap = (uint32_t *) calloc(db->p_users.nprim, sizeof(uint32_t));
if (usermap == NULL) {
error = errno;
ERR(base, "%s", strerror(errno));
goto err;
}
for (i = 0; i < db->p_users.nprim; i++) {
usermap[i] = i + 1;
}
rt = expand_module_avrules(base->sh, db, db, typemap, boolmap, rolemap, usermap, 0, neverallows);
#else
rt = expand_module_avrules(base->sh, db, db, typemap, boolmap, 0, neverallows);
#endif // end of user/role mapping
#else
rt = expand_module_avrules(base->sh, db, db, typemap, 0, neverallows);
#endif // end of boolean mapping
if (rt < 0) {
error = errno;
goto err;
}
rt = 0;
exit:
free(typemap);
free(boolmap);
free(rolemap);
free(usermap);
errno = error;
return rt;
err:
rt = -1;
/* libsepol does not always set errno correctly, so have a
default errno here */
if (!error)
error = EIO;
goto exit;
}
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