contiki/core/net/mac/tsch/tsch-security.h

128 lines
5.0 KiB
C

/*
* Copyright (c) 2014, SICS Swedish ICT.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
*/
#ifndef __TSCH_SECURITY_H__
#define __TSCH_SECURITY_H__
/********** Includes **********/
#include "contiki.h"
#include "net/mac/tsch/tsch-asn.h"
#include "net/mac/tsch/tsch-private.h"
#include "net/mac/frame802154.h"
#include "net/mac/frame802154e-ie.h"
/******** Configuration *******/
/* To enable TSCH security:
* - set LLSEC802154_CONF_SECURITY_LEVEL
* - set LLSEC802154_CONF_USES_EXPLICIT_KEYS
* - unset LLSEC802154_CONF_USES_FRAME_COUNTER
* */
#define TSCH_SECURITY_ENABLED (LLSEC802154_CONF_SECURITY_LEVEL != 0)
#if TSCH_SECURITY_ENABLED && !LLSEC802154_CONF_USES_EXPLICIT_KEYS
#error TSCH_SECURITY_ENABLED set but LLSEC802154_CONF_USES_EXPLICIT_KEYS unset
#endif /* TSCH_SECURITY_ENABLED */
#if TSCH_SECURITY_ENABLED && LLSEC802154_CONF_USES_FRAME_COUNTER
#error TSCH_SECURITY_ENABLED set but LLSEC802154_CONF_USES_FRAME_COUNTER set
#endif /* TSCH_SECURITY_ENABLED */
/* K1, defined in 6TiSCH minimal, is well-known (offers no security) and used for EBs only */
#ifdef TSCH_SECURITY_CONF_K1
#define TSCH_SECURITY_K1 TSCH_SECURITY_CONF_K1
#else /* TSCH_SECURITY_CONF_K1 */
#define TSCH_SECURITY_K1 { 0x36, 0x54, 0x69, 0x53, 0x43, 0x48, 0x20, 0x6D, 0x69, 0x6E, 0x69, 0x6D, 0x61, 0x6C, 0x31, 0x35 }
#endif /* TSCH_SECURITY_CONF_K1 */
/* K2, defined in 6TiSCH minimal, is used for all but EB traffic */
#ifdef TSCH_SECURITY_CONF_K2
#define TSCH_SECURITY_K2 TSCH_SECURITY_CONF_K2
#else /* TSCH_SECURITY_CONF_K2 */
#define TSCH_SECURITY_K2 { 0xde, 0xad, 0xbe, 0xef, 0xfa, 0xce, 0xca, 0xfe, 0xde, 0xad, 0xbe, 0xef, 0xfa, 0xce, 0xca, 0xfe }
#endif /* TSCH_SECURITY_CONF_K2 */
/* Key used for EBs */
#ifdef TSCH_SECURITY_CONF_KEY_INDEX_EB
#define TSCH_SECURITY_KEY_INDEX_EB TSCH_SECURITY_CONF_KEY_INDEX_EB
#else
#define TSCH_SECURITY_KEY_INDEX_EB 1 /* Use K1 as per 6TiSCH minimal */
#endif
/* Security level for EBs */
#ifdef TSCH_SECURITY_CONF_SEC_LEVEL_EB
#define TSCH_SECURITY_KEY_SEC_LEVEL_EB TSCH_SECURITY_CONF_SEC_LEVEL_EB
#else
#define TSCH_SECURITY_KEY_SEC_LEVEL_EB 1 /* MIC-32, as per 6TiSCH minimal */
#endif
/* Key used for ACK */
#ifdef TSCH_SECURITY_CONF_KEY_INDEX_ACK
#define TSCH_SECURITY_KEY_INDEX_ACK TSCH_SECURITY_CONF_KEY_INDEX_ACK
#else
#define TSCH_SECURITY_KEY_INDEX_ACK 2 /* Use K2 as per 6TiSCH minimal */
#endif
/* Security level for ACKs */
#ifdef TSCH_SECURITY_CONF_SEC_LEVEL_ACK
#define TSCH_SECURITY_KEY_SEC_LEVEL_ACK TSCH_SECURITY_CONF_SEC_LEVEL_ACK
#else
#define TSCH_SECURITY_KEY_SEC_LEVEL_ACK 5 /* Encryption + MIC-32, as per 6TiSCH minimal */
#endif
/* Key used for Other (Data, Cmd) */
#ifdef TSCH_SECURITY_CONF_KEY_INDEX_OTHER
#define TSCH_SECURITY_KEY_INDEX_OTHER TSCH_SECURITY_CONF_KEY_INDEX_OTHER
#else
#define TSCH_SECURITY_KEY_INDEX_OTHER 2 /* Use K2 as per 6TiSCH minimal */
#endif
/* Security level for Other (Data, Cmd) */
#ifdef TSCH_SECURITY_CONF_SEC_LEVEL_OTHER
#define TSCH_SECURITY_KEY_SEC_LEVEL_OTHER TSCH_SECURITY_CONF_SEC_LEVEL_OTHER
#else
#define TSCH_SECURITY_KEY_SEC_LEVEL_OTHER 5 /* Encryption + MIC-32, as per 6TiSCH minimal */
#endif
/************ Types ***********/
typedef uint8_t aes_key[16];
/********** Functions *********/
int tsch_security_mic_len(const frame802154_t *frame);
int tsch_security_secure_frame(uint8_t *hdr, uint8_t *outbuf,
int hdrlen, int datalen, struct asn_t *asn);
int tsch_security_parse_frame(const uint8_t *hdr, int hdrlen, int datalen,
const frame802154_t *frame, const linkaddr_t *sender, struct asn_t *asn);
#endif /* __TSCH_SECURITY_H__ */