githubmirror/setools

libqpol/context_query.c
126 строк3 KB
Chris PeBenito
Fix qpol_context_get_range() not to segfault on MLS-disabled policy.
15 мар 2015, 19:37
15 мар 2015, 19:37757a167
/**
*  @file
*  Defines the public interface for accessing contexts.
*
*  @author Kevin Carr kcarr@tresys.com
*  @author Jeremy A. Mowery jmowery@tresys.com
*  @author Jason Tang jtang@tresys.com
*
*  Copyright (C) 2006-2007 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 <stddef.h>
#include <stdlib.h>
#include <stdint.h>
#include <qpol/policy.h>
#include <qpol/context_query.h>
#include <qpol/user_query.h>
#include <qpol/role_query.h>
#include <qpol/type_query.h>
#include <qpol/mls_query.h>
#include <sepol/policydb/policydb.h>
#include <sepol/policydb/context.h>
#include "qpol_internal.h"

int qpol_context_get_user(const qpol_policy_t * policy, const qpol_context_t * context, const qpol_user_t ** user)
{
	policydb_t *db = NULL;
	context_struct_t *internal_context = NULL;

	if (user != NULL)
		*user = NULL;

	if (policy == NULL || context == NULL || user == NULL) {
		ERR(policy, "%s", strerror(EINVAL));
		errno = EINVAL;
		return STATUS_ERR;
	}

	internal_context = (context_struct_t *) context;
	db = &policy->p->p;

	*user = (qpol_user_t *) db->user_val_to_struct[internal_context->user - 1];

	return STATUS_SUCCESS;
}

int qpol_context_get_role(const qpol_policy_t * policy, const qpol_context_t * context, const qpol_role_t ** role)
{
	policydb_t *db = NULL;
	context_struct_t *internal_context = NULL;

	if (role != NULL)
		*role = NULL;

	if (policy == NULL || context == NULL || role == NULL) {
		ERR(policy, "%s", strerror(EINVAL));
		errno = EINVAL;
		return STATUS_ERR;
	}

	internal_context = (context_struct_t *) context;
	db = &policy->p->p;

	*role = (qpol_role_t *) db->role_val_to_struct[internal_context->role - 1];

	return STATUS_SUCCESS;
}

int qpol_context_get_type(const qpol_policy_t * policy, const qpol_context_t * context, const qpol_type_t ** type)
{
	policydb_t *db = NULL;
	context_struct_t *internal_context = NULL;

	if (type != NULL)
		*type = NULL;

	if (policy == NULL || context == NULL || type == NULL) {
		ERR(policy, "%s", strerror(EINVAL));
		errno = EINVAL;
		return STATUS_ERR;
	}

	internal_context = (context_struct_t *) context;
	db = &policy->p->p;

	*type = (qpol_type_t *) db->type_val_to_struct[internal_context->type - 1];

	return STATUS_SUCCESS;
}

int qpol_context_get_range(const qpol_policy_t * policy, const qpol_context_t * context, const qpol_mls_range_t ** range)
{
	context_struct_t *internal_context = NULL;

	if (range != NULL)
		*range = NULL;

	if (policy == NULL || context == NULL || range == NULL) {
		ERR(policy, "%s", strerror(EINVAL));
		errno = EINVAL;
		return STATUS_ERR;
	}

	if (!qpol_policy_has_capability(policy, QPOL_CAP_MLS)) {
		*range = NULL;
	} else {
		internal_context = (context_struct_t *) context;
		*range = (qpol_mls_range_t *) & internal_context->range;
	}

	return STATUS_SUCCESS;
}