/* * Copyright (C) 2014 BlueKitchen GmbH * * 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 copyright holders nor the names of * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * 4. Any redistribution, use, or modification is done solely for * personal benefit and not for any commercial purpose or for * monetary gain. * * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH 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 MATTHIAS * RINGWALD 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. * * Please inquire about commercial licensing options at * contact@bluekitchen-gmbh.com * */ #define BTSTACK_FILE__ "mesh_upper_transport.c" #include "mesh/mesh_upper_transport.h" #include #include #include #include "btstack_util.h" #include "btstack_memory.h" #include "btstack_debug.h" #include "mesh/beacon.h" #include "mesh/mesh_iv_index_seq_number.h" #include "mesh/mesh_keys.h" #include "mesh/mesh_lower_transport.h" #include "mesh/mesh_peer.h" #include "mesh/mesh_virtual_addresses.h" // TODO: extract mesh_pdu functions into lower transport or network #include "mesh/mesh_access.h" static void (*higher_layer_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); static void mesh_print_hex(const char * name, const uint8_t * data, uint16_t len){ printf("%-20s ", name); printf_hexdump(data, len); } // static void mesh_print_x(const char * name, uint32_t value){ // printf("%20s: 0x%x", name, (int) value); // } // combined key x address iterator for upper transport decryption typedef struct { // state mesh_transport_key_iterator_t key_it; mesh_virtual_address_iterator_t address_it; // elements const mesh_transport_key_t * key; const mesh_virtual_address_t * address; // address - might be virtual uint16_t dst; // key info } mesh_transport_key_and_virtual_address_iterator_t; static void mesh_transport_key_and_virtual_address_iterator_init(mesh_transport_key_and_virtual_address_iterator_t *it, uint16_t dst, uint16_t netkey_index, uint8_t akf, uint8_t aid) { printf("KEY_INIT: dst %04x, akf %x, aid %x\n", dst, akf, aid); // config it->dst = dst; // init elements it->key = NULL; it->address = NULL; // init element iterators mesh_transport_key_aid_iterator_init(&it->key_it, netkey_index, akf, aid); // init address iterator if (mesh_network_address_virtual(it->dst)){ mesh_virtual_address_iterator_init(&it->address_it, dst); // get first key if (mesh_transport_key_aid_iterator_has_more(&it->key_it)) { it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); } } } // cartesian product: keys x addressses static int mesh_transport_key_and_virtual_address_iterator_has_more(mesh_transport_key_and_virtual_address_iterator_t * it){ if (mesh_network_address_virtual(it->dst)) { // find next valid entry while (1){ if (mesh_virtual_address_iterator_has_more(&it->address_it)) return 1; if (!mesh_transport_key_aid_iterator_has_more(&it->key_it)) return 0; // get next key it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); mesh_virtual_address_iterator_init(&it->address_it, it->dst); } } else { return mesh_transport_key_aid_iterator_has_more(&it->key_it); } } static void mesh_transport_key_and_virtual_address_iterator_next(mesh_transport_key_and_virtual_address_iterator_t * it){ if (mesh_network_address_virtual(it->dst)) { it->address = mesh_virtual_address_iterator_get_next(&it->address_it); } else { it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); } } // UPPER TRANSPORT // stub lower transport static void mesh_upper_transport_validate_unsegmented_message(void); static void mesh_upper_transport_validate_segmented_message(void); static void mesh_upper_transport_run(void); static int crypto_active; static mesh_network_pdu_t * incoming_network_pdu_raw; static mesh_network_pdu_t * incoming_network_pdu_decoded; static mesh_transport_pdu_t * incoming_transport_pdu_raw; static mesh_transport_pdu_t * incoming_transport_pdu_decoded; static uint8_t application_nonce[13]; static btstack_crypto_ccm_t ccm; static mesh_transport_key_and_virtual_address_iterator_t mesh_transport_key_it; // upper transport callbacks - in access layer static void (*mesh_access_message_handler)(mesh_pdu_t * pdu); static void (*mesh_control_message_handler)(mesh_pdu_t * pdu); // incoming unsegmented (network) and segmented (transport) control and access messages static btstack_linked_list_t upper_transport_incoming; // outgoing unsegmented (network) and segmented (uppert_transport_outgoing) control and access messages static btstack_linked_list_t upper_transport_outgoing; static void mesh_upper_transport_dump_pdus(const char *name, btstack_linked_list_t *list){ printf("List: %s:\n", name); btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, list); while (btstack_linked_list_iterator_has_next(&it)){ mesh_pdu_t * pdu = (mesh_pdu_t*) btstack_linked_list_iterator_next(&it); printf("- %p\n", pdu); // printf_hexdump( mesh_pdu_data(pdu), mesh_pdu_len(pdu)); } } static void mesh_upper_transport_reset_pdus(btstack_linked_list_t *list){ while (!btstack_linked_list_empty(list)){ mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_pop(list); switch (pdu->pdu_type){ case MESH_PDU_TYPE_NETWORK: btstack_memory_mesh_network_pdu_free((mesh_network_pdu_t *) pdu); break; case MESH_PDU_TYPE_TRANSPORT: btstack_memory_mesh_transport_pdu_free((mesh_transport_pdu_t *) pdu); break; default: break; } } } void mesh_upper_transport_dump(void){ printf("incoming_network_pdu_raw: %p\n", incoming_network_pdu_raw); printf("incoming_network_pdu_decoded: %p\n", incoming_network_pdu_decoded); mesh_upper_transport_dump_pdus("upper_transport_incoming", &upper_transport_incoming); } void mesh_upper_transport_reset(void){ crypto_active = 0; if (incoming_network_pdu_raw){ mesh_network_pdu_free(incoming_network_pdu_raw); incoming_network_pdu_raw = NULL; } // if (incoming_network_pdu_decoded){ // mesh_network_pdu_free(incoming_network_pdu_decoded); // incoming_network_pdu_decoded = NULL; // } mesh_upper_transport_reset_pdus(&upper_transport_incoming); } static void mesh_upper_unsegmented_control_message_received(mesh_network_pdu_t * network_pdu){ uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); uint8_t opcode = lower_transport_pdu[0]; if (mesh_control_message_handler){ mesh_control_message_handler((mesh_pdu_t*) network_pdu); } else { printf("[!] Unhandled Control message with opcode %02x\n", opcode); // done mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *) network_pdu); } } static void mesh_upper_transport_process_unsegmented_message_done(mesh_network_pdu_t *network_pdu){ crypto_active = 0; if (mesh_network_control(network_pdu)) { mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *) network_pdu); } else { mesh_network_pdu_free(network_pdu); mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *) incoming_network_pdu_raw); incoming_network_pdu_raw = NULL; } mesh_upper_transport_run(); } static void mesh_upper_transport_process_segmented_message_done(mesh_transport_pdu_t *transport_pdu){ crypto_active = 0; if (mesh_transport_ctl(transport_pdu)) { mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)transport_pdu); } else { mesh_transport_pdu_free(transport_pdu); mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)incoming_transport_pdu_raw); incoming_transport_pdu_raw = NULL; } mesh_upper_transport_run(); } static uint32_t iv_index_for_ivi_nid(uint8_t ivi_nid){ // get IV Index and IVI uint32_t iv_index = mesh_get_iv_index(); int ivi = ivi_nid >> 7; // if least significant bit differs, use previous IV Index if ((iv_index & 1 ) ^ ivi){ iv_index--; } return iv_index; } static void transport_unsegmented_setup_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ nonce[1] = 0x00; // SZMIC if a Segmented Access message or 0 for all other message formats memcpy(&nonce[2], &network_pdu->data[2], 7); big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(network_pdu->data[0])); } static void transport_segmented_setup_nonce(uint8_t * nonce, const mesh_transport_pdu_t * transport_pdu){ nonce[1] = transport_pdu->transmic_len == 8 ? 0x80 : 0x00; memcpy(&nonce[2], &transport_pdu->network_header[2], 7); big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(transport_pdu->network_header[0])); } static void transport_unsegmented_setup_application_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ nonce[0] = 0x01; transport_unsegmented_setup_nonce(nonce, network_pdu); mesh_print_hex("AppNonce", nonce, 13); } static void transport_unsegmented_setup_device_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ nonce[0] = 0x02; transport_unsegmented_setup_nonce(nonce, network_pdu); mesh_print_hex("DeviceNonce", nonce, 13); } static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_transport_pdu_t * transport_pdu){ nonce[0] = 0x01; transport_segmented_setup_nonce(nonce, transport_pdu); mesh_print_hex("AppNonce", nonce, 13); } static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_transport_pdu_t * transport_pdu){ nonce[0] = 0x02; transport_segmented_setup_nonce(nonce, transport_pdu); mesh_print_hex("DeviceNonce", nonce, 13); } static void mesh_upper_transport_validate_unsegmented_message_ccm(void * arg){ UNUSED(arg); uint8_t * lower_transport_pdu = mesh_network_pdu_data(incoming_network_pdu_decoded); uint8_t trans_mic_len = 4; // store TransMIC uint8_t trans_mic[8]; btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); mesh_print_hex("TransMIC", trans_mic, trans_mic_len); uint8_t * upper_transport_pdu = mesh_network_pdu_data(incoming_network_pdu_decoded) + 1; uint8_t upper_transport_pdu_len = mesh_network_pdu_len(incoming_network_pdu_decoded) - 1; mesh_print_hex("Decryted PDU", upper_transport_pdu, upper_transport_pdu_len - trans_mic_len); if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len - trans_mic_len], trans_mic_len) == 0){ printf("TransMIC matches\n"); // remove TransMIC from payload incoming_network_pdu_decoded->len -= trans_mic_len; // if virtual address, update dst to pseudo_dst if (mesh_network_address_virtual(mesh_network_dst(incoming_network_pdu_decoded))){ big_endian_store_16(incoming_network_pdu_decoded->data, 7, mesh_transport_key_it.address->pseudo_dst); } // pass to upper layer if (mesh_access_message_handler){ mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_network_pdu_decoded; incoming_network_pdu_decoded = NULL; mesh_access_message_handler(pdu); } else { printf("[!] Unhandled Unsegmented Access message\n"); // done mesh_upper_transport_process_unsegmented_message_done(incoming_network_pdu_decoded); } printf("\n"); } else { uint8_t afk = lower_transport_pdu[0] & 0x40; if (afk){ printf("TransMIC does not match, try next key\n"); mesh_upper_transport_validate_unsegmented_message(); } else { printf("TransMIC does not match device key, done\n"); // done mesh_upper_transport_process_unsegmented_message_done(incoming_network_pdu_decoded); } } } static void mesh_upper_transport_validate_segmented_message_ccm(void * arg){ UNUSED(arg); uint8_t * upper_transport_pdu = incoming_transport_pdu_decoded->data; uint8_t upper_transport_pdu_len = incoming_transport_pdu_decoded->len - incoming_transport_pdu_decoded->transmic_len; mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); // store TransMIC uint8_t trans_mic[8]; btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); mesh_print_hex("TransMIC", trans_mic, incoming_transport_pdu_decoded->transmic_len); if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], incoming_transport_pdu_decoded->transmic_len) == 0){ printf("TransMIC matches\n"); // remove TransMIC from payload incoming_transport_pdu_decoded->len -= incoming_transport_pdu_decoded->transmic_len; // if virtual address, update dst to pseudo_dst if (mesh_network_address_virtual(mesh_transport_dst(incoming_transport_pdu_decoded))){ big_endian_store_16(incoming_transport_pdu_decoded->network_header, 7, mesh_transport_key_it.address->pseudo_dst); } // pass to upper layer if (mesh_access_message_handler){ mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_transport_pdu_decoded; incoming_network_pdu_decoded = NULL; mesh_access_message_handler(pdu); } else { printf("[!] Unhandled Segmented Access/Control message\n"); // done mesh_upper_transport_process_segmented_message_done(incoming_transport_pdu_decoded); } printf("\n"); } else { uint8_t akf = incoming_transport_pdu_decoded->akf_aid_control & 0x40; if (akf){ printf("TransMIC does not match, try next key\n"); mesh_upper_transport_validate_segmented_message(); } else { printf("TransMIC does not match device key, done\n"); // done mesh_upper_transport_process_segmented_message_done(incoming_transport_pdu_decoded); } } } void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ crypto_active = 0; switch (pdu->pdu_type){ case MESH_PDU_TYPE_NETWORK: mesh_upper_transport_process_unsegmented_message_done((mesh_network_pdu_t *) pdu); break; case MESH_PDU_TYPE_TRANSPORT: mesh_upper_transport_process_segmented_message_done((mesh_transport_pdu_t *) pdu); break; default: break; } } static void mesh_upper_transport_validate_segmented_message_digest(void * arg){ UNUSED(arg); uint8_t upper_transport_pdu_len = incoming_transport_pdu_raw->len - incoming_transport_pdu_raw->transmic_len; uint8_t * upper_transport_pdu_data_in = incoming_transport_pdu_raw->data; uint8_t * upper_transport_pdu_data_out = incoming_transport_pdu_decoded->data; btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_in, upper_transport_pdu_data_out, &mesh_upper_transport_validate_segmented_message_ccm, NULL); } static void mesh_upper_transport_validate_unsegmented_message_digest(void * arg){ UNUSED(arg); uint8_t trans_mic_len = 4; uint8_t lower_transport_pdu_len = incoming_network_pdu_raw->len - 9; uint8_t * upper_transport_pdu_data_in = &incoming_network_pdu_raw->data[10]; uint8_t * upper_transport_pdu_data_out = &incoming_network_pdu_decoded->data[10]; uint8_t upper_transport_pdu_len = lower_transport_pdu_len - 1 - trans_mic_len; btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_in, upper_transport_pdu_data_out, &mesh_upper_transport_validate_unsegmented_message_ccm, NULL); } static void mesh_upper_transport_validate_unsegmented_message(void){ if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ printf("No valid transport key found\n"); mesh_upper_transport_process_unsegmented_message_done(incoming_network_pdu_decoded); return; } mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); const mesh_transport_key_t * message_key = mesh_transport_key_it.key; if (message_key->akf){ transport_unsegmented_setup_application_nonce(application_nonce, incoming_network_pdu_raw); } else { transport_unsegmented_setup_device_nonce(application_nonce, incoming_network_pdu_raw); } // store application / device key index mesh_print_hex("AppOrDevKey", message_key->key, 16); incoming_network_pdu_decoded->appkey_index = message_key->appkey_index; // unsegmented message have TransMIC of 32 bit uint8_t trans_mic_len = 4; printf("Unsegmented Access message with TransMIC len 4\n"); uint8_t lower_transport_pdu_len = incoming_network_pdu_raw->len - 9; uint8_t * upper_transport_pdu_data = &incoming_network_pdu_raw->data[10]; uint8_t upper_transport_pdu_len = lower_transport_pdu_len - 1 - trans_mic_len; mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); // decrypt ccm crypto_active = 1; uint16_t aad_len = 0; if (mesh_network_address_virtual(mesh_network_dst(incoming_network_pdu_decoded))){ aad_len = 16; } btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, trans_mic_len); if (aad_len){ btstack_crypto_ccm_digest(&ccm, (uint8_t*) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_unsegmented_message_digest, NULL); } else { mesh_upper_transport_validate_unsegmented_message_digest(incoming_network_pdu_decoded); } } static void mesh_upper_transport_validate_segmented_message(void){ uint8_t * upper_transport_pdu_data = incoming_transport_pdu_decoded->data; uint8_t upper_transport_pdu_len = incoming_transport_pdu_decoded->len - incoming_transport_pdu_decoded->transmic_len; if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ printf("No valid transport key found\n"); mesh_upper_transport_process_segmented_message_done(incoming_transport_pdu_decoded); return; } mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); const mesh_transport_key_t * message_key = mesh_transport_key_it.key; if (message_key->akf){ transport_segmented_setup_application_nonce(application_nonce, incoming_transport_pdu_raw); } else { transport_segmented_setup_device_nonce(application_nonce, incoming_transport_pdu_raw); } // store application / device key index mesh_print_hex("AppOrDevKey", message_key->key, 16); incoming_transport_pdu_decoded->appkey_index = message_key->appkey_index; mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); // decrypt ccm crypto_active = 1; uint16_t aad_len = 0; if (mesh_network_address_virtual(mesh_transport_dst(incoming_transport_pdu_decoded))){ aad_len = 16; } btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, incoming_transport_pdu_decoded->transmic_len); if (aad_len){ btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_segmented_message_digest, NULL); } else { mesh_upper_transport_validate_segmented_message_digest(NULL); } } static void mesh_upper_transport_process_unsegmented_access_message(void){ // copy original pdu incoming_network_pdu_decoded->len = incoming_network_pdu_raw->len; memcpy(incoming_network_pdu_decoded->data, incoming_network_pdu_raw->data, incoming_network_pdu_decoded->len); // uint8_t * lower_transport_pdu = &incoming_network_pdu_raw->data[9]; uint8_t lower_transport_pdu_len = incoming_network_pdu_raw->len - 9; mesh_print_hex("Lower Transport network pdu", &incoming_network_pdu_raw->data[9], lower_transport_pdu_len); uint8_t aid = lower_transport_pdu[0] & 0x3f; uint8_t akf = (lower_transport_pdu[0] & 0x40) >> 6; printf("AKF: %u\n", akf); printf("AID: %02x\n", aid); mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_network_dst(incoming_network_pdu_decoded), incoming_network_pdu_decoded->netkey_index, akf, aid); mesh_upper_transport_validate_unsegmented_message(); } static void mesh_upper_transport_process_message(void){ // copy original pdu memcpy(incoming_transport_pdu_decoded, incoming_transport_pdu_raw, sizeof(mesh_transport_pdu_t)); // uint8_t * upper_transport_pdu = incoming_transport_pdu_decoded->data; uint8_t upper_transport_pdu_len = incoming_transport_pdu_decoded->len - incoming_transport_pdu_decoded->transmic_len; mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); uint8_t aid = incoming_transport_pdu_decoded->akf_aid_control & 0x3f; uint8_t akf = (incoming_transport_pdu_decoded->akf_aid_control & 0x40) >> 6; printf("AKF: %u\n", akf); printf("AID: %02x\n", aid); mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_transport_dst(incoming_transport_pdu_decoded), incoming_transport_pdu_decoded->netkey_index, akf, aid); mesh_upper_transport_validate_segmented_message(); } static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); mesh_upper_transport_run(); } void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ mesh_network_pdu_t * network_pdu; mesh_transport_pdu_t * transport_pdu; switch (pdu->pdu_type) { case MESH_PDU_TYPE_NETWORK: network_pdu = (mesh_network_pdu_t *) pdu; mesh_network_pdu_free(network_pdu); break; case MESH_PDU_TYPE_TRANSPORT: transport_pdu = (mesh_transport_pdu_t *) pdu; mesh_transport_pdu_free(transport_pdu); break; default: break; } } static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ switch (callback_type){ case MESH_TRANSPORT_PDU_RECEIVED: mesh_upper_transport_message_received(pdu); break; case MESH_TRANSPORT_PDU_SENT: // notify upper layer (or just free pdu) if (higher_layer_handler){ higher_layer_handler(callback_type, status, pdu); } else { mesh_upper_transport_pdu_free(pdu); } break; default: break; } } static void mesh_upper_transport_send_unsegmented_access_pdu_ccm(void * arg){ crypto_active = 0; mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) arg; uint8_t * upper_transport_pdu = mesh_network_pdu_data(network_pdu) + 1; uint8_t upper_transport_pdu_len = mesh_network_pdu_len(network_pdu) - 1; mesh_print_hex("EncAccessPayload", upper_transport_pdu, upper_transport_pdu_len); // store TransMIC btstack_crypto_ccm_get_authentication_value(&ccm, &upper_transport_pdu[upper_transport_pdu_len]); mesh_print_hex("TransMIC", &upper_transport_pdu[upper_transport_pdu_len], 4); network_pdu->len += 4; upper_transport_pdu_len += 4; mesh_print_hex("UpperTransportPDU", upper_transport_pdu, upper_transport_pdu_len); // send network pdu mesh_lower_transport_send_pdu((mesh_pdu_t*) network_pdu); } static void mesh_upper_transport_send_segmented_access_pdu_ccm(void * arg){ crypto_active = 0; mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) arg; mesh_print_hex("EncAccessPayload", transport_pdu->data, transport_pdu->len); // store TransMIC btstack_crypto_ccm_get_authentication_value(&ccm, &transport_pdu->data[transport_pdu->len]); mesh_print_hex("TransMIC", &transport_pdu->data[transport_pdu->len], transport_pdu->transmic_len); transport_pdu->len += transport_pdu->transmic_len; mesh_print_hex("UpperTransportPDU", transport_pdu->data, transport_pdu->len); mesh_lower_transport_send_pdu((mesh_pdu_t*) transport_pdu); } static uint8_t mesh_upper_transport_setup_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu, uint16_t netkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ printf("[+] Upper transport, setup unsegmented Control PDU %p (opcode %02x): ", network_pdu, opcode); printf_hexdump(control_pdu_data, control_pdu_len); if (control_pdu_len > 11) return 1; const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); if (!network_key) return 1; uint8_t transport_pdu_data[12]; transport_pdu_data[0] = opcode; memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); uint16_t transport_pdu_len = control_pdu_len + 1; // setup network_pdu mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); return 0; } static uint8_t mesh_upper_transport_setup_segmented_control_pdu(mesh_transport_pdu_t * transport_pdu, uint16_t netkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ printf("[+] Upper transport, setup segmented Control PDU (opcode %02x): \n", opcode); printf_hexdump(control_pdu_data, control_pdu_len); if (control_pdu_len > 256) return 1; const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); if (!network_key) return 1; memcpy(transport_pdu->data, control_pdu_data, control_pdu_len); transport_pdu->len = control_pdu_len; transport_pdu->netkey_index = netkey_index; transport_pdu->akf_aid_control = opcode; transport_pdu->transmic_len = 0; // no TransMIC for control mesh_transport_set_nid_ivi(transport_pdu, network_key->nid); mesh_transport_set_src(transport_pdu, src); mesh_transport_set_dest(transport_pdu, dest); mesh_transport_set_ctl_ttl(transport_pdu, 0x80 | ttl); return 0; } uint8_t mesh_upper_transport_setup_control_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ switch (pdu->pdu_type){ case MESH_PDU_TYPE_NETWORK: return mesh_upper_transport_setup_unsegmented_control_pdu((mesh_network_pdu_t *) pdu, netkey_index, ttl, src, dest, opcode, control_pdu_data, control_pdu_len); case MESH_PDU_TYPE_TRANSPORT: return mesh_upper_transport_setup_segmented_control_pdu((mesh_transport_pdu_t *) pdu, netkey_index, ttl, src, dest, opcode, control_pdu_data, control_pdu_len); default: return 1; } } static uint8_t mesh_upper_transport_setup_unsegmented_access_pdu_header(mesh_network_pdu_t * network_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest){ // get app or device key const mesh_transport_key_t * appkey; appkey = mesh_transport_key_get(appkey_index); if (appkey == NULL){ printf("appkey_index %x unknown\n", appkey_index); return 1; } uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; // lookup network by netkey_index const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); if (!network_key) return 1; // Nonce for Access Payload based on Network Sequence number: needs to be fixed now and lower layers need to send packet in right order uint32_t seq = mesh_sequence_number_next(); network_pdu->data[9] = akf_aid; // setup network_pdu mesh_network_setup_pdu_header(network_pdu, netkey_index, network_key->nid, 0, ttl, seq, src, dest); network_pdu->appkey_index = appkey_index; return 0; } static uint8_t mesh_upper_transport_setup_unsegmented_access_pdu(mesh_network_pdu_t * network_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ int status = mesh_upper_transport_setup_unsegmented_access_pdu_header(network_pdu, netkey_index, appkey_index, ttl, src, dest); if (status) return status; printf("[+] Upper transport, setup unsegmented Access PDU - seq %06x\n", mesh_network_seq(network_pdu)); mesh_print_hex("Access Payload", access_pdu_data, access_pdu_len); // store in transport pdu memcpy(&network_pdu->data[10], access_pdu_data, access_pdu_len); network_pdu->len = 10 + access_pdu_len; return 0; } static uint8_t mesh_upper_transport_setup_segmented_access_pdu_header(mesh_transport_pdu_t * transport_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ // get app or device key const mesh_transport_key_t *appkey; appkey = mesh_transport_key_get(appkey_index); if (appkey == NULL) { printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); return 1; } uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; // lookup network by netkey_index const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); if (!network_key) return 1; if (network_key == NULL) { printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); return 1; } const uint8_t trans_mic_len = szmic ? 8 : 4; // reserve one sequence number, which is also used to encrypt access payload uint32_t seq = mesh_sequence_number_next(); transport_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; // store in transport pdu transport_pdu->transmic_len = trans_mic_len; transport_pdu->netkey_index = netkey_index; transport_pdu->appkey_index = appkey_index; transport_pdu->akf_aid_control = akf_aid; mesh_transport_set_nid_ivi(transport_pdu, network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7)); mesh_transport_set_seq(transport_pdu, seq); mesh_transport_set_src(transport_pdu, src); mesh_transport_set_dest(transport_pdu, dest); mesh_transport_set_ctl_ttl(transport_pdu, ttl); return 0; } static uint8_t mesh_upper_transport_setup_segmented_access_pdu(mesh_transport_pdu_t * transport_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ int status = mesh_upper_transport_setup_segmented_access_pdu_header(transport_pdu, netkey_index, appkey_index, ttl, src, dest, szmic); if (status) return status; // store in transport pdu memcpy(transport_pdu->data, access_pdu_data, access_pdu_len); transport_pdu->len = access_pdu_len; printf("[+] Upper transport, setup segmented Access PDU - seq %06x, szmic %u, iv_index %08x\n", mesh_transport_seq(transport_pdu), szmic, mesh_get_iv_index_for_tx()); mesh_print_hex("Access Payload", transport_pdu->data, transport_pdu->len); return 0; } uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ switch (pdu->pdu_type){ case MESH_PDU_TYPE_NETWORK: return mesh_upper_transport_setup_unsegmented_access_pdu_header((mesh_network_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest); case MESH_PDU_TYPE_TRANSPORT: return mesh_upper_transport_setup_segmented_access_pdu_header((mesh_transport_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic); default: return 1; } } uint8_t mesh_upper_transport_setup_access_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ switch (pdu->pdu_type){ case MESH_PDU_TYPE_NETWORK: return mesh_upper_transport_setup_unsegmented_access_pdu((mesh_network_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, access_pdu_data, access_pdu_len); case MESH_PDU_TYPE_TRANSPORT: return mesh_upper_transport_setup_segmented_access_pdu((mesh_transport_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic, access_pdu_data, access_pdu_len); default: return 1; } } static void mesh_upper_transport_send_unsegmented_access_pdu_digest(void * arg){ mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) arg; uint8_t * access_pdu_data = mesh_network_pdu_data(network_pdu) + 1; uint16_t access_pdu_len = mesh_network_pdu_len(network_pdu) - 1; btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, access_pdu_data, access_pdu_data, &mesh_upper_transport_send_unsegmented_access_pdu_ccm, network_pdu); } static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ // Device Key is fixed if (appkey_index == MESH_DEVICE_KEY_INDEX) { return mesh_transport_key_get(appkey_index); } // Get key refresh state from subnet mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); if (subnet == NULL) return NULL; // identify old and new app keys for given appkey_index mesh_transport_key_t * old_key = NULL; mesh_transport_key_t * new_key = NULL; mesh_transport_key_iterator_t it; mesh_transport_key_iterator_init(&it, netkey_index); while (mesh_transport_key_iterator_has_more(&it)){ mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); if (transport_key->appkey_index != appkey_index) continue; if (transport_key->old_key == 0) { new_key = transport_key; } else { old_key = transport_key; } } // if no key is marked as old, just use the current one if (old_key == NULL) return new_key; // use new key if it exists in phase two if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ return new_key; } else { return old_key; } } static void mesh_upper_transport_send_unsegmented_access_pdu(mesh_network_pdu_t * network_pdu){ // if dst is virtual address, lookup label uuid and hash uint16_t aad_len = 0; mesh_virtual_address_t * virtual_address = NULL; uint16_t dst = mesh_network_dst(network_pdu); if (mesh_network_address_virtual(dst)){ virtual_address = mesh_virtual_address_for_pseudo_dst(dst); if (!virtual_address){ printf("No virtual address register for pseudo dst %4x\n", dst); btstack_memory_mesh_network_pdu_free(network_pdu); return; } aad_len = 16; big_endian_store_16(network_pdu->data, 7, virtual_address->hash); } // setup nonce uint16_t appkey_index = network_pdu->appkey_index; if (appkey_index == MESH_DEVICE_KEY_INDEX){ transport_unsegmented_setup_device_nonce(application_nonce, network_pdu); } else { transport_unsegmented_setup_application_nonce(application_nonce, network_pdu); } // get app or device key const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(network_pdu->netkey_index, appkey_index); mesh_print_hex("AppOrDevKey", appkey->key, 16); // encrypt ccm uint8_t trans_mic_len = 4; uint16_t access_pdu_len = mesh_network_pdu_len(network_pdu) - 1; crypto_active = 1; btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, trans_mic_len); if (virtual_address){ mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, &mesh_upper_transport_send_unsegmented_access_pdu_digest, network_pdu); } else { mesh_upper_transport_send_unsegmented_access_pdu_digest(network_pdu); } } static void mesh_upper_transport_send_segmented_access_pdu_digest(void *arg){ mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) arg; uint16_t access_pdu_len = transport_pdu->len; uint8_t * access_pdu_data = transport_pdu->data; btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len,access_pdu_data, access_pdu_data, &mesh_upper_transport_send_segmented_access_pdu_ccm, transport_pdu); } static void mesh_upper_transport_send_segmented_access_pdu(mesh_transport_pdu_t * transport_pdu){ // if dst is virtual address, lookup label uuid and hash uint16_t aad_len = 0; mesh_virtual_address_t * virtual_address = NULL; uint16_t dst = mesh_transport_dst(transport_pdu); if (mesh_network_address_virtual(dst)){ virtual_address = mesh_virtual_address_for_pseudo_dst(dst); if (!virtual_address){ printf("No virtual address register for pseudo dst %4x\n", dst); btstack_memory_mesh_transport_pdu_free(transport_pdu); return; } // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); // printf_hexdump(virtual_address->label_uuid, 16); aad_len = 16; big_endian_store_16(transport_pdu->network_header, 7, virtual_address->hash); } // reserve slot mesh_lower_transport_reserve_slot(); // setup nonce - uses dst, so after pseudo address translation uint16_t appkey_index = transport_pdu->appkey_index; if (appkey_index == MESH_DEVICE_KEY_INDEX){ transport_segmented_setup_device_nonce(application_nonce, transport_pdu); } else { transport_segmented_setup_application_nonce(application_nonce, transport_pdu); } // get app or device key const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(transport_pdu->netkey_index, appkey_index); mesh_print_hex("AppOrDevKey", appkey->key, 16); // encrypt ccm uint8_t transmic_len = transport_pdu->transmic_len; uint16_t access_pdu_len = transport_pdu->len; crypto_active = 1; btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); if (virtual_address){ mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, &mesh_upper_transport_send_segmented_access_pdu_digest, transport_pdu); } else { mesh_upper_transport_send_segmented_access_pdu_digest(transport_pdu); } } static void mesh_upper_transport_run(void){ while(!btstack_linked_list_empty(&upper_transport_incoming)){ if (crypto_active) return; // peek at next message mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_incoming); mesh_transport_pdu_t * transport_pdu; mesh_network_pdu_t * network_pdu; switch (pdu->pdu_type){ case MESH_PDU_TYPE_NETWORK: network_pdu = (mesh_network_pdu_t *) pdu; // control? if (mesh_network_control(network_pdu)) { (void) btstack_linked_list_pop(&upper_transport_incoming); mesh_upper_unsegmented_control_message_received(network_pdu); } else { incoming_network_pdu_decoded = mesh_network_pdu_get(); if (!incoming_network_pdu_decoded) return; // get encoded network pdu and start processing incoming_network_pdu_raw = network_pdu; (void) btstack_linked_list_pop(&upper_transport_incoming); mesh_upper_transport_process_unsegmented_access_message(); } break; case MESH_PDU_TYPE_TRANSPORT: transport_pdu = (mesh_transport_pdu_t *) pdu; uint8_t ctl = mesh_transport_ctl(transport_pdu); if (ctl){ printf("Ignoring Segmented Control Message\n"); (void) btstack_linked_list_pop(&upper_transport_incoming); mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *) transport_pdu); } else { incoming_transport_pdu_decoded = mesh_transport_pdu_get(); if (!incoming_transport_pdu_decoded) return; // get encoded transport pdu and start processing incoming_transport_pdu_raw = transport_pdu; (void) btstack_linked_list_pop(&upper_transport_incoming); mesh_upper_transport_process_message(); } break; default: break; } } while (!btstack_linked_list_empty(&upper_transport_outgoing)){ if (crypto_active) break; mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_pop(&upper_transport_outgoing); if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == 0) break; if (mesh_pdu_ctl(pdu)){ mesh_lower_transport_reserve_slot(); mesh_lower_transport_send_pdu(pdu); continue; } switch (pdu->pdu_type){ case MESH_PDU_TYPE_NETWORK: mesh_upper_transport_send_unsegmented_access_pdu((mesh_network_pdu_t *) pdu); break; case MESH_PDU_TYPE_TRANSPORT: mesh_upper_transport_send_segmented_access_pdu((mesh_transport_pdu_t *) pdu); break; default: break; } } } void mesh_upper_transport_register_access_message_handler(void (*callback)(mesh_pdu_t *pdu)){ mesh_access_message_handler = callback; } void mesh_upper_transport_register_control_message_handler(void (*callback)(mesh_pdu_t *pdu)){ mesh_control_message_handler = callback; } void mesh_upper_transport_set_higher_layer_handler(void (*pdu_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu)){ higher_layer_handler = pdu_handler; } void mesh_upper_transport_init(){ mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); } void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ if (pdu->pdu_type == MESH_PDU_TYPE_NETWORK){ btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); } btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); mesh_upper_transport_run(); } void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ if (pdu->pdu_type == MESH_PDU_TYPE_NETWORK){ btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); } btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); mesh_upper_transport_run(); }