146 lines
5.5 KiB
C
146 lines
5.5 KiB
C
/*
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* Copyright (c) 2014, SICS Swedish ICT.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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#ifndef __TSCH_SECURITY_H__
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#define __TSCH_SECURITY_H__
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/********** Includes **********/
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#include "contiki.h"
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#include "net/mac/tsch/tsch-asn.h"
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#include "net/mac/tsch/tsch-private.h"
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#include "net/mac/frame802154.h"
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#include "net/llsec/llsec802154.h"
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#include "net/mac/frame802154e-ie.h"
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/******** Configuration *******/
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/* To enable TSCH security:
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* - set LLSEC802154_CONF_ENABLED
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* - set LLSEC802154_CONF_USES_EXPLICIT_KEYS
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* - unset LLSEC802154_CONF_USES_FRAME_COUNTER
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* */
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#if LLSEC802154_ENABLED && !LLSEC802154_USES_EXPLICIT_KEYS
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#error LLSEC802154_ENABLED set but LLSEC802154_USES_EXPLICIT_KEYS unset
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#endif /* LLSEC802154_ENABLED */
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#if LLSEC802154_ENABLED && LLSEC802154_USES_FRAME_COUNTER
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#error LLSEC802154_ENABLED set but LLSEC802154_USES_FRAME_COUNTER set
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#endif /* LLSEC802154_ENABLED */
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/* K1, defined in 6TiSCH minimal, is well-known (offers no security) and used for EBs only */
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#ifdef TSCH_SECURITY_CONF_K1
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#define TSCH_SECURITY_K1 TSCH_SECURITY_CONF_K1
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#else /* TSCH_SECURITY_CONF_K1 */
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#define TSCH_SECURITY_K1 { 0x36, 0x54, 0x69, 0x53, 0x43, 0x48, 0x20, 0x6D, 0x69, 0x6E, 0x69, 0x6D, 0x61, 0x6C, 0x31, 0x35 }
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#endif /* TSCH_SECURITY_CONF_K1 */
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/* K2, defined in 6TiSCH minimal, is used for all but EB traffic */
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#ifdef TSCH_SECURITY_CONF_K2
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#define TSCH_SECURITY_K2 TSCH_SECURITY_CONF_K2
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#else /* TSCH_SECURITY_CONF_K2 */
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#define TSCH_SECURITY_K2 { 0xde, 0xad, 0xbe, 0xef, 0xfa, 0xce, 0xca, 0xfe, 0xde, 0xad, 0xbe, 0xef, 0xfa, 0xce, 0xca, 0xfe }
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#endif /* TSCH_SECURITY_CONF_K2 */
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/* Key used for EBs */
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#ifdef TSCH_SECURITY_CONF_KEY_INDEX_EB
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#define TSCH_SECURITY_KEY_INDEX_EB TSCH_SECURITY_CONF_KEY_INDEX_EB
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#else
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#define TSCH_SECURITY_KEY_INDEX_EB 1 /* Use K1 as per 6TiSCH minimal */
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#endif
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/* Security level for EBs */
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#ifdef TSCH_SECURITY_CONF_SEC_LEVEL_EB
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#define TSCH_SECURITY_KEY_SEC_LEVEL_EB TSCH_SECURITY_CONF_SEC_LEVEL_EB
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#else
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#define TSCH_SECURITY_KEY_SEC_LEVEL_EB 1 /* MIC-32, as per 6TiSCH minimal */
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#endif
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/* Key used for ACK */
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#ifdef TSCH_SECURITY_CONF_KEY_INDEX_ACK
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#define TSCH_SECURITY_KEY_INDEX_ACK TSCH_SECURITY_CONF_KEY_INDEX_ACK
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#else
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#define TSCH_SECURITY_KEY_INDEX_ACK 2 /* Use K2 as per 6TiSCH minimal */
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#endif
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/* Security level for ACKs */
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#ifdef TSCH_SECURITY_CONF_SEC_LEVEL_ACK
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#define TSCH_SECURITY_KEY_SEC_LEVEL_ACK TSCH_SECURITY_CONF_SEC_LEVEL_ACK
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#else
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#define TSCH_SECURITY_KEY_SEC_LEVEL_ACK 5 /* Encryption + MIC-32, as per 6TiSCH minimal */
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#endif
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/* Key used for Other (Data, Cmd) */
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#ifdef TSCH_SECURITY_CONF_KEY_INDEX_OTHER
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#define TSCH_SECURITY_KEY_INDEX_OTHER TSCH_SECURITY_CONF_KEY_INDEX_OTHER
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#else
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#define TSCH_SECURITY_KEY_INDEX_OTHER 2 /* Use K2 as per 6TiSCH minimal */
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#endif
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/* Security level for Other (Data, Cmd) */
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#ifdef TSCH_SECURITY_CONF_SEC_LEVEL_OTHER
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#define TSCH_SECURITY_KEY_SEC_LEVEL_OTHER TSCH_SECURITY_CONF_SEC_LEVEL_OTHER
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#else
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#define TSCH_SECURITY_KEY_SEC_LEVEL_OTHER 5 /* Encryption + MIC-32, as per 6TiSCH minimal */
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#endif
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/************ Types ***********/
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typedef uint8_t aes_key[16];
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/********** Functions *********/
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/**
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* \brief Return MIC length
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* \return The length of MIC (>= 0)
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*/
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unsigned int tsch_security_mic_len(const frame802154_t *frame);
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/**
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* \brief Protect a frame with encryption and/or MIC
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* \return The length of a generated MIC (>= 0)
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*/
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unsigned int tsch_security_secure_frame(uint8_t *hdr, uint8_t *outbuf,
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int hdrlen, int datalen,
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struct tsch_asn_t *asn);
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/**
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* \brief Parse and check a frame protected with encryption and/or MIC
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* \retval 0 On error or security check failure (insecure frame)
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* \retval 1 On success or no need for security check (good frame)
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*/
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unsigned int tsch_security_parse_frame(const uint8_t *hdr, int hdrlen,
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int datalen, const frame802154_t *frame,
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const linkaddr_t *sender,
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struct tsch_asn_t *asn);
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#endif /* __TSCH_SECURITY_H__ */
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