1 /* 2 * Copyright (C) 2017 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define __BTSTACK_FILE__ "provisioning_provisioner.c" 39 40 #include "mesh/provisioning_provisioner.h" 41 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 #include "btstack.h" 47 48 #include "mesh/mesh_crypto.h" 49 #include "mesh/pb_adv.h" 50 #include "mesh/provisioning.h" 51 52 static void provisioning_public_key_ready(void); 53 54 // global 55 static uint8_t prov_ec_q[64]; 56 static const uint8_t * prov_public_key_oob_q; 57 static const uint8_t * prov_public_key_oob_d; 58 static uint8_t prov_public_key_oob_available; 59 60 static btstack_packet_handler_t prov_packet_handler; 61 62 // NetKey 63 static uint8_t net_key[16]; 64 // NetKeyIndex 65 static uint16_t net_key_index; 66 // Flags 67 static uint8_t flags; 68 // IV Index 69 static uint32_t iv_index; 70 71 // either used once or per session 72 static btstack_crypto_aes128_cmac_t prov_cmac_request; 73 static btstack_crypto_random_t prov_random_request; 74 static btstack_crypto_ecc_p256_t prov_ecc_p256_request; 75 static btstack_crypto_ccm_t prov_ccm_request; 76 77 // data per provisioning session 78 static btstack_timer_source_t prov_protocol_timer; 79 80 static uint16_t pb_adv_cid; 81 static uint8_t prov_attention_timer; 82 static uint8_t prov_buffer_out[100]; // TODO: how large are prov messages? 83 static uint8_t prov_waiting_for_outgoing_complete; 84 static uint8_t prov_error_code; 85 static uint8_t prov_start_algorithm; 86 static uint8_t prov_start_public_key_used; 87 static uint8_t prov_start_authentication_method; 88 static uint8_t prov_start_authentication_action; 89 static uint8_t prov_start_authentication_size; 90 static uint8_t prov_authentication_string; 91 static uint8_t prov_confirmation_inputs[1 + 11 + 5 + 64 + 64]; 92 static uint8_t confirmation_provisioner[16]; 93 static uint8_t random_provisioner[16]; 94 static uint8_t auth_value[16]; 95 static uint8_t remote_ec_q[64]; 96 static uint8_t dhkey[32]; 97 static uint8_t confirmation_salt[16]; 98 static uint8_t confirmation_key[16]; 99 // ConfirmationInputs = ProvisioningInvitePDUValue || ProvisioningCapabilitiesPDUValue || ProvisioningStartPDUValue || PublicKeyProvisioner || PublicKeyDevice 100 static uint8_t prov_confirmation_inputs[1 + 11 + 5 + 64 + 64]; 101 static uint8_t provisioning_salt[16]; 102 static uint8_t session_key[16]; 103 static uint8_t session_nonce[16]; 104 static uint16_t unicast_address; 105 static uint8_t provisioning_data[25]; 106 static uint8_t enc_provisioning_data[25]; 107 static uint8_t provisioning_data_mic[8]; 108 static uint8_t prov_emit_output_oob_active; 109 110 static const uint8_t * prov_static_oob_data; 111 static uint16_t prov_static_oob_len; 112 113 #if 0 114 static uint8_t prov_public_key_oob_used; 115 static uint8_t prov_emit_public_key_oob_active; 116 117 // capabilites 118 119 static uint16_t prov_output_oob_actions; 120 static uint16_t prov_input_oob_actions; 121 static uint8_t prov_output_oob_size; 122 static uint8_t prov_input_oob_size; 123 124 // derived 125 static uint8_t network_id[8]; 126 static uint8_t beacon_key[16]; 127 128 static void provisioning_attention_timer_timeout(btstack_timer_source_t * ts){ 129 UNUSED(ts); 130 if (prov_attention_timer_timeout == 0) return; 131 prov_attention_timer_timeout--; 132 provisioning_attention_timer_set(); 133 } 134 135 static void provisioning_attention_timer_set(void){ 136 provisioning_emit_attention_timer_event(1, prov_attention_timer_timeout); 137 if (prov_attention_timer_timeout){ 138 btstack_run_loop_set_timer_handler(&prov_attention_timer, &provisioning_attention_timer_timeout); 139 btstack_run_loop_set_timer(&prov_attention_timer, 1000); 140 btstack_run_loop_add_timer(&prov_attention_timer); 141 } 142 } 143 #endif 144 145 static void provisioning_emit_output_oob_event(uint16_t pb_adv_cid, uint32_t number){ 146 if (!prov_packet_handler) return; 147 uint8_t event[9] = { HCI_EVENT_MESH_META, 7, MESH_SUBEVENT_PB_PROV_START_EMIT_OUTPUT_OOB}; 148 little_endian_store_16(event, 3, pb_adv_cid); 149 little_endian_store_16(event, 5, number); 150 prov_packet_handler(HCI_EVENT_PACKET, 0, event, sizeof(event)); 151 } 152 153 static void provisioning_emit_event(uint8_t mesh_subevent, uint16_t pb_adv_cid){ 154 if (!prov_packet_handler) return; 155 uint8_t event[5] = { HCI_EVENT_MESH_META, 3, mesh_subevent}; 156 little_endian_store_16(event, 3, pb_adv_cid); 157 prov_packet_handler(HCI_EVENT_PACKET, 0, event, sizeof(event)); 158 } 159 160 static void provisiong_timer_handler(btstack_timer_source_t * ts){ 161 UNUSED(ts); 162 printf("Provisioning Protocol Timeout -> Close Link!\n"); 163 // TODO: use actual pb_adv_cid 164 pb_adv_close_link(1, 1); 165 } 166 167 // The provisioning protocol shall have a minimum timeout of 60 seconds that is reset 168 // each time a provisioning protocol PDU is sent or received 169 static void provisioning_timer_start(void){ 170 btstack_run_loop_remove_timer(&prov_protocol_timer); 171 btstack_run_loop_set_timer_handler(&prov_protocol_timer, &provisiong_timer_handler); 172 btstack_run_loop_set_timer(&prov_protocol_timer, PROVISIONING_PROTOCOL_TIMEOUT_MS); 173 btstack_run_loop_add_timer(&prov_protocol_timer); 174 } 175 176 static void provisioning_timer_stop(void){ 177 btstack_run_loop_remove_timer(&prov_protocol_timer); 178 } 179 180 // Outgoing Provisioning PDUs 181 182 static void provisioning_send_invite(uint16_t pb_adv_cid){ 183 prov_buffer_out[0] = MESH_PROV_INVITE; 184 prov_buffer_out[1] = prov_attention_timer; 185 pb_adv_send_pdu(pb_adv_cid, prov_buffer_out, 2); 186 // collect confirmation_inputs 187 memcpy(&prov_confirmation_inputs[0], &prov_buffer_out[1], 1); 188 } 189 190 static void provisioning_send_start(uint16_t pb_adv_cid){ 191 prov_buffer_out[0] = MESH_PROV_START; 192 prov_buffer_out[1] = prov_start_algorithm; 193 prov_buffer_out[2] = prov_start_public_key_used; 194 prov_buffer_out[3] = prov_start_authentication_method; 195 prov_buffer_out[4] = prov_start_authentication_action; 196 prov_buffer_out[5] = prov_start_authentication_size; 197 pb_adv_send_pdu(pb_adv_cid, prov_buffer_out, 6); 198 // store for confirmation inputs: len 5 199 memcpy(&prov_confirmation_inputs[12], &prov_buffer_out[1], 5); 200 } 201 202 static void provisioning_send_provisioning_error(void){ 203 prov_buffer_out[0] = MESH_PROV_FAILED; 204 prov_buffer_out[1] = prov_error_code; 205 pb_adv_send_pdu(pb_adv_cid, prov_buffer_out, 2); 206 } 207 208 static void provisioning_send_public_key(void){ 209 prov_buffer_out[0] = MESH_PROV_PUB_KEY; 210 memcpy(&prov_buffer_out[1], prov_ec_q, 64); 211 pb_adv_send_pdu(pb_adv_cid, prov_buffer_out, 65); 212 // store for confirmation inputs: len 64 213 memcpy(&prov_confirmation_inputs[17], &prov_buffer_out[1], 64); 214 } 215 216 static void provisioning_send_confirm(void){ 217 prov_buffer_out[0] = MESH_PROV_CONFIRM; 218 memcpy(&prov_buffer_out[1], confirmation_provisioner, 16); 219 pb_adv_send_pdu(pb_adv_cid, prov_buffer_out, 17); 220 } 221 222 static void provisioning_send_random(void){ 223 prov_buffer_out[0] = MESH_PROV_RANDOM; 224 memcpy(&prov_buffer_out[1], random_provisioner, 16); 225 pb_adv_send_pdu(pb_adv_cid, prov_buffer_out, 17); 226 } 227 228 static void provisioning_send_data(void){ 229 prov_buffer_out[0] = MESH_PROV_DATA; 230 memcpy(&prov_buffer_out[1], enc_provisioning_data, 25); 231 memcpy(&prov_buffer_out[26], provisioning_data_mic, 8); 232 pb_adv_send_pdu(pb_adv_cid, prov_buffer_out, 34); 233 } 234 235 typedef enum { 236 PROVISIONER_IDLE, 237 PROVISIONER_SEND_INVITE, 238 PROVISIONER_W4_CAPABILITIES, 239 PROVISIONER_W4_AUTH_CONFIGURATION, 240 PROVISIONER_SEND_START, 241 PROVISIONED_W2_EMIT_READ_PUB_KEY_OOB, 242 PROVISIONER_SEND_PUB_KEY, 243 PROVISIONER_W4_PUB_KEY, 244 PROVISIONER_W4_PUB_KEY_OOB, 245 PROVISIONER_W4_INPUT_OOK, 246 PROVISIONER_W4_INPUT_COMPLETE, 247 PROVISIONER_SEND_CONFIRM, 248 PROVISIONER_W4_CONFIRM, 249 PROVISIONER_SEND_RANDOM, 250 PROVISIONER_W4_RANDOM, 251 PROVISIONER_SEND_DATA, 252 PROVISIONER_W4_COMPLETE, 253 PROVISIONER_SEND_ERROR, 254 } provisioner_state_t; 255 256 static provisioner_state_t provisioner_state; 257 258 static void provisioning_run(void){ 259 if (prov_waiting_for_outgoing_complete) return; 260 int start_timer = 1; 261 switch (provisioner_state){ 262 case PROVISIONER_SEND_ERROR: 263 start_timer = 0; // game over 264 provisioning_send_provisioning_error(); 265 break; 266 case PROVISIONER_SEND_INVITE: 267 provisioning_send_invite(pb_adv_cid); 268 provisioner_state = PROVISIONER_W4_CAPABILITIES; 269 break; 270 case PROVISIONER_SEND_START: 271 provisioning_send_start(pb_adv_cid); 272 if (prov_start_public_key_used){ 273 provisioner_state = PROVISIONED_W2_EMIT_READ_PUB_KEY_OOB; 274 } else { 275 provisioner_state = PROVISIONER_SEND_PUB_KEY; 276 } 277 break; 278 case PROVISIONED_W2_EMIT_READ_PUB_KEY_OOB: 279 printf("Public OOB: please read OOB from remote device\n"); 280 provisioner_state = PROVISIONER_W4_PUB_KEY_OOB; 281 provisioning_emit_event(MESH_SUBEVENT_PB_PROV_START_RECEIVE_PUBLIC_KEY_OOB, 1); 282 break; 283 case PROVISIONER_SEND_PUB_KEY: 284 provisioning_send_public_key(); 285 if (prov_start_public_key_used){ 286 provisioning_public_key_ready(); 287 } else { 288 provisioner_state = PROVISIONER_W4_PUB_KEY; 289 } 290 break; 291 case PROVISIONER_SEND_CONFIRM: 292 provisioning_send_confirm(); 293 provisioner_state = PROVISIONER_W4_CONFIRM; 294 break; 295 case PROVISIONER_SEND_RANDOM: 296 provisioning_send_random(); 297 provisioner_state = PROVISIONER_W4_RANDOM; 298 break; 299 case PROVISIONER_SEND_DATA: 300 provisioning_send_data(); 301 provisioner_state = PROVISIONER_W4_COMPLETE; 302 break; 303 default: 304 return; 305 } 306 if (start_timer){ 307 provisioning_timer_start(); 308 } 309 prov_waiting_for_outgoing_complete = 1; 310 } 311 312 // End of outgoing PDUs 313 314 static void provisioning_done(void){ 315 // if (prov_emit_public_key_oob_active){ 316 // prov_emit_public_key_oob_active = 0; 317 // provisioning_emit_event(MESH_PB_PROV_STOP_EMIT_PUBLIC_KEY_OOB, 1); 318 // } 319 if (prov_emit_output_oob_active){ 320 prov_emit_output_oob_active = 0; 321 provisioning_emit_event(MESH_SUBEVENT_PB_PROV_STOP_EMIT_OUTPUT_OOB, 1); 322 } 323 provisioner_state = PROVISIONER_IDLE; 324 } 325 326 327 static void provisioning_handle_provisioning_error(uint8_t error_code){ 328 provisioning_timer_stop(); 329 prov_error_code = error_code; 330 provisioner_state = PROVISIONER_SEND_ERROR; 331 provisioning_run(); 332 } 333 334 static void provisioning_handle_link_opened(uint16_t pb_adv_cid){ 335 provisioner_state = PROVISIONER_SEND_INVITE; 336 } 337 338 static void provisioning_handle_capabilities(uint16_t pb_adv_cid, const uint8_t * packet_data, uint16_t packet_len){ 339 340 if (packet_len != 11) return; 341 342 // collect confirmation_inputs 343 memcpy(&prov_confirmation_inputs[1], packet_data, packet_len); 344 345 provisioner_state = PROVISIONER_W4_AUTH_CONFIGURATION; 346 347 // notify client and wait for auth method selection 348 uint8_t event[16] = { HCI_EVENT_MESH_META, 3, MESH_SUBEVENT_PB_PROV_CAPABILITIES}; 349 little_endian_store_16(event, 3, pb_adv_cid); 350 event[5] = packet_data[0]; 351 little_endian_store_16(event, 6, big_endian_read_16(packet_data, 1)); 352 event[8] = packet_data[3]; 353 event[9] = packet_data[4]; 354 event[10] = packet_data[5]; 355 little_endian_store_16(event, 11, big_endian_read_16(packet_data, 6)); 356 event[13] = packet_data[8]; 357 little_endian_store_16(event, 14, big_endian_read_16(packet_data, 9)); 358 prov_packet_handler(HCI_EVENT_PACKET, 0, event, sizeof(event)); 359 } 360 361 static void provisioning_handle_confirmation_provisioner_calculated(void * arg){ 362 UNUSED(arg); 363 364 printf("ConfirmationProvisioner: "); 365 printf_hexdump(confirmation_provisioner, sizeof(confirmation_provisioner)); 366 367 provisioner_state = PROVISIONER_SEND_CONFIRM; 368 provisioning_run(); 369 } 370 371 static void provisioning_handle_random_provisioner(void * arg){ 372 printf("RandomProvisioner: "); 373 printf_hexdump(random_provisioner, sizeof(random_provisioner)); 374 375 // re-use prov_confirmation_inputs buffer 376 memcpy(&prov_confirmation_inputs[0], random_provisioner, 16); 377 memcpy(&prov_confirmation_inputs[16], auth_value, 16); 378 379 // calc confirmation device 380 btstack_crypto_aes128_cmac_message(&prov_cmac_request, confirmation_key, 32, prov_confirmation_inputs, confirmation_provisioner, &provisioning_handle_confirmation_provisioner_calculated, NULL); 381 } 382 383 static void provisioning_handle_confirmation_k1_calculated(void * arg){ 384 printf("ConfirmationKey: "); 385 printf_hexdump(confirmation_key, sizeof(confirmation_key)); 386 387 // generate random_device 388 btstack_crypto_random_generate(&prov_random_request,random_provisioner, 16, &provisioning_handle_random_provisioner, NULL); 389 } 390 391 static void provisioning_handle_confirmation_salt(void * arg){ 392 UNUSED(arg); 393 394 // dump 395 printf("ConfirmationSalt: "); 396 printf_hexdump(confirmation_salt, sizeof(confirmation_salt)); 397 398 // ConfirmationKey 399 mesh_k1(&prov_cmac_request, dhkey, sizeof(dhkey), confirmation_salt, (const uint8_t*) "prck", 4, confirmation_key, &provisioning_handle_confirmation_k1_calculated, NULL); 400 } 401 402 static void provisioning_handle_auth_value_ready(void){ 403 // CalculationInputs 404 printf("ConfirmationInputs: "); 405 printf_hexdump(prov_confirmation_inputs, sizeof(prov_confirmation_inputs)); 406 407 // calculate s1 408 btstack_crypto_aes128_cmac_zero(&prov_cmac_request, sizeof(prov_confirmation_inputs), prov_confirmation_inputs, confirmation_salt, &provisioning_handle_confirmation_salt, NULL); 409 } 410 411 static void provisioning_handle_auth_value_input_oob(void * arg){ 412 413 // limit auth value to single digit 414 auth_value[15] = auth_value[15] % 9 + 1; 415 printf("Input OOB: %u\n", auth_value[15]); 416 417 if (prov_authentication_string){ 418 // strings start at 0 while numbers are stored as 16-byte big endian 419 auth_value[0] = auth_value[15] + '0'; 420 auth_value[15] = 0; 421 } 422 423 printf("AuthValue: "); 424 printf_hexdump(auth_value, sizeof(auth_value)); 425 426 // emit output oob value 427 provisioning_emit_output_oob_event(1, auth_value[15]); 428 prov_emit_output_oob_active = 1; 429 430 provisioner_state = PROVISIONER_W4_INPUT_COMPLETE; 431 } 432 433 static void provisioning_handle_input_complete(uint16_t pb_adv_cid){ 434 provisioning_handle_auth_value_ready(); 435 } 436 437 static void provisioning_public_key_exchange_complete(void){ 438 // reset auth_value 439 memset(auth_value, 0, sizeof(auth_value)); 440 441 // handle authentication method 442 switch (prov_start_authentication_method){ 443 case 0x00: 444 provisioning_handle_auth_value_ready(); 445 break; 446 case 0x01: 447 memcpy(&auth_value[16-prov_static_oob_len], prov_static_oob_data, prov_static_oob_len); 448 provisioning_handle_auth_value_ready(); 449 break; 450 case 0x02: 451 // Output OOB 452 prov_authentication_string = prov_start_authentication_action == 0x04; 453 printf("Output OOB requested (and we're in Provisioniner role), string %u\n", prov_authentication_string); 454 provisioner_state = PROVISIONER_W4_INPUT_OOK; 455 provisioning_emit_event(MESH_SUBEVENT_PB_PROV_OUTPUT_OOB_REQUEST, 1); 456 break; 457 case 0x03: 458 // Input OOB 459 prov_authentication_string = prov_start_authentication_action == 0x03; 460 printf("Input OOB requested, string %u\n", prov_authentication_string); 461 printf("Generate random for auth_value\n"); 462 // generate single byte of random data to use for authentication 463 btstack_crypto_random_generate(&prov_random_request, &auth_value[15], 1, &provisioning_handle_auth_value_input_oob, NULL); 464 provisioning_emit_event(MESH_SUBEVENT_PB_PROV_START_EMIT_INPUT_OOB, 1); 465 break; 466 default: 467 break; 468 } 469 } 470 471 static void provisioning_handle_public_key_dhkey(void * arg){ 472 UNUSED(arg); 473 474 printf("DHKEY: "); 475 printf_hexdump(dhkey, sizeof(dhkey)); 476 477 #if 0 478 // skip sending own public key when public key oob is used 479 if (prov_public_key_oob_available && prov_public_key_oob_used){ 480 // just copy key for confirmation inputs 481 memcpy(&prov_confirmation_inputs[81], prov_ec_q, 64); 482 } else { 483 // queue public key pdu 484 provisioning_queue_pdu(MESH_PROV_PUB_KEY); 485 } 486 #endif 487 488 provisioning_public_key_exchange_complete(); 489 } 490 491 static void provisioning_public_key_ready(void){ 492 // calculate DHKey 493 btstack_crypto_ecc_p256_calculate_dhkey(&prov_ecc_p256_request, remote_ec_q, dhkey, provisioning_handle_public_key_dhkey, NULL); 494 } 495 496 static void provisioning_handle_public_key(uint16_t pb_adv_cid, const uint8_t *packet_data, uint16_t packet_len){ 497 498 // validate public key 499 if (packet_len != sizeof(remote_ec_q) || btstack_crypto_ecc_p256_validate_public_key(packet_data) != 0){ 500 printf("Public Key invalid, abort provisioning\n"); 501 502 // disconnect provisioning link 503 pb_adv_close_link(pb_adv_cid, 0x02); // reason: fail 504 provisioning_timer_stop(); 505 return; 506 } 507 508 #if 0 509 // stop emit public OOK if specified and send to crypto module 510 if (prov_public_key_oob_available && prov_public_key_oob_used){ 511 provisioning_emit_event(MESH_PB_PROV_STOP_EMIT_PUBLIC_KEY_OOB, 1); 512 513 printf("Replace generated ECC with Public Key OOB:"); 514 memcpy(prov_ec_q, prov_public_key_oob_q, 64); 515 printf_hexdump(prov_ec_q, sizeof(prov_ec_q)); 516 btstack_crypto_ecc_p256_set_key(prov_public_key_oob_q, prov_public_key_oob_d); 517 } 518 #endif 519 520 // store for confirmation inputs: len 64 521 memcpy(&prov_confirmation_inputs[81], packet_data, 64); 522 523 // store remote q 524 memcpy(remote_ec_q, packet_data, sizeof(remote_ec_q)); 525 526 provisioning_public_key_ready(); 527 } 528 529 static void provisioning_handle_confirmation(uint16_t pb_adv_cid, const uint8_t *packet_data, uint16_t packet_len){ 530 531 UNUSED(packet_data); 532 UNUSED(packet_len); 533 534 // 535 if (prov_emit_output_oob_active){ 536 prov_emit_output_oob_active = 0; 537 provisioning_emit_event(MESH_SUBEVENT_PB_PROV_STOP_EMIT_OUTPUT_OOB, 1); 538 } 539 540 #if 0 541 // CalculationInputs 542 printf("ConfirmationInputs: "); 543 printf_hexdump(prov_confirmation_inputs, sizeof(prov_confirmation_inputs)); 544 545 // calculate s1 546 btstack_crypto_aes128_cmac_zero(&prov_cmac_request, sizeof(prov_confirmation_inputs), prov_confirmation_inputs, confirmation_salt, &provisioning_handle_confirmation_s1_calculated, NULL); 547 #endif 548 provisioner_state = PROVISIONER_SEND_RANDOM; 549 } 550 551 static void provisioning_handle_data_encrypted(void * arg){ 552 UNUSED(arg); 553 554 // enc_provisioning_data 555 printf("EncProvisioningData: "); 556 printf_hexdump(enc_provisioning_data, sizeof(enc_provisioning_data)); 557 558 btstack_crypto_ccm_get_authentication_value(&prov_ccm_request, provisioning_data_mic); 559 printf("MIC: "); 560 printf_hexdump(provisioning_data_mic, sizeof(provisioning_data_mic)); 561 562 // send 563 provisioner_state = PROVISIONER_SEND_DATA; 564 provisioning_run(); 565 } 566 567 static void provisioning_handle_session_nonce_calculated(void * arg){ 568 UNUSED(arg); 569 570 // The nonce shall be the 13 least significant octets == zero most significant octets 571 uint8_t temp[13]; 572 memcpy(temp, &session_nonce[3], 13); 573 memcpy(session_nonce, temp, 13); 574 575 // SessionNonce 576 printf("SessionNonce: "); 577 printf_hexdump(session_nonce, 13); 578 579 // setup provisioning data 580 memcpy(&provisioning_data[0], net_key, 16); 581 big_endian_store_16(provisioning_data, 16, net_key_index); 582 provisioning_data[18] = flags; 583 big_endian_store_32(provisioning_data, 19, iv_index); 584 big_endian_store_16(provisioning_data, 23, unicast_address); 585 586 btstack_crypto_ccm_init(&prov_ccm_request, session_key, session_nonce, 25, 0, 8); 587 btstack_crypto_ccm_encrypt_block(&prov_ccm_request, 25, provisioning_data, enc_provisioning_data, &provisioning_handle_data_encrypted, NULL); 588 } 589 590 static void provisioning_handle_session_key_calculated(void * arg){ 591 UNUSED(arg); 592 593 // SessionKey 594 printf("SessionKey: "); 595 printf_hexdump(session_key, sizeof(session_key)); 596 597 // SessionNonce 598 mesh_k1(&prov_cmac_request, dhkey, sizeof(dhkey), provisioning_salt, (const uint8_t*) "prsn", 4, session_nonce, &provisioning_handle_session_nonce_calculated, NULL); 599 } 600 601 602 static void provisioning_handle_provisioning_salt_calculated(void * arg){ 603 UNUSED(arg); 604 605 // ProvisioningSalt 606 printf("ProvisioningSalt: "); 607 printf_hexdump(provisioning_salt, sizeof(provisioning_salt)); 608 609 // SessionKey 610 mesh_k1(&prov_cmac_request, dhkey, sizeof(dhkey), provisioning_salt, (const uint8_t*) "prsk", 4, session_key, &provisioning_handle_session_key_calculated, NULL); 611 } 612 613 static void provisioning_handle_random(uint16_t pb_adv_cid, const uint8_t *packet_data, uint16_t packet_len){ 614 615 UNUSED(packet_data); 616 UNUSED(packet_len); 617 618 // TODO: validate Confirmation 619 620 // calc ProvisioningSalt = s1(ConfirmationSalt || RandomProvisioner || RandomDevice) 621 memcpy(&prov_confirmation_inputs[0], confirmation_salt, 16); 622 memcpy(&prov_confirmation_inputs[16], random_provisioner, 16); 623 memcpy(&prov_confirmation_inputs[32], packet_data, 16); 624 btstack_crypto_aes128_cmac_zero(&prov_cmac_request, 48, prov_confirmation_inputs, provisioning_salt, &provisioning_handle_provisioning_salt_calculated, NULL); 625 } 626 627 static void provisioning_handle_complete(uint16_t pb_adv_cid){ 628 } 629 630 static void provisioning_handle_pdu(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 631 632 if (size < 1) return; 633 634 switch (packet_type){ 635 case HCI_EVENT_PACKET: 636 if (packet[0] != HCI_EVENT_MESH_META) break; 637 switch (packet[2]){ 638 case MESH_SUBEVENT_PB_TRANSPORT_LINK_OPEN: 639 printf("Link opened, sending Invite\n"); 640 provisioning_handle_link_opened(pb_adv_cid); 641 break; 642 case MESH_SUBEVENT_PB_TRANSPORT_PDU_SENT: 643 printf("Outgoing packet acked\n"); 644 prov_waiting_for_outgoing_complete = 0; 645 break; 646 case MESH_SUBEVENT_PB_TRANSPORT_LINK_CLOSED: 647 printf("Link close, reset state\n"); 648 provisioning_done(); 649 break; 650 } 651 break; 652 case PROVISIONING_DATA_PACKET: 653 // check state 654 switch (provisioner_state){ 655 case PROVISIONER_W4_CAPABILITIES: 656 if (packet[0] != MESH_PROV_CAPABILITIES) provisioning_handle_provisioning_error(0x03); 657 printf("MESH_PROV_CAPABILITIES: "); 658 printf_hexdump(&packet[1], size-1); 659 provisioning_handle_capabilities(pb_adv_cid, &packet[1], size-1); 660 break; 661 case PROVISIONER_W4_PUB_KEY: 662 if (packet[0] != MESH_PROV_PUB_KEY) provisioning_handle_provisioning_error(0x03); 663 printf("MESH_PROV_PUB_KEY: "); 664 printf_hexdump(&packet[1], size-1); 665 provisioning_handle_public_key(pb_adv_cid, &packet[1], size-1); 666 break; 667 case PROVISIONER_W4_INPUT_COMPLETE: 668 if (packet[0] != MESH_PROV_INPUT_COMPLETE) provisioning_handle_provisioning_error(0x03); 669 printf("MESH_PROV_INPUT_COMPLETE: "); 670 printf_hexdump(&packet[1], size-1); 671 provisioning_handle_input_complete(pb_adv_cid); 672 break; 673 case PROVISIONER_W4_CONFIRM: 674 if (packet[0] != MESH_PROV_CONFIRM) provisioning_handle_provisioning_error(0x03); 675 printf("MESH_PROV_CONFIRM: "); 676 printf_hexdump(&packet[1], size-1); 677 provisioning_handle_confirmation(pb_adv_cid, &packet[1], size-1); 678 break; 679 case PROVISIONER_W4_RANDOM: 680 if (packet[0] != MESH_PROV_RANDOM) provisioning_handle_provisioning_error(0x03); 681 printf("MESH_PROV_RANDOM: "); 682 printf_hexdump(&packet[1], size-1); 683 provisioning_handle_random(pb_adv_cid, &packet[1], size-1); 684 break; 685 case PROVISIONER_W4_COMPLETE: 686 if (packet[0] != MESH_PROV_COMPLETE) provisioning_handle_provisioning_error(0x03); 687 printf("MESH_PROV_COMPLETE: "); 688 provisioning_handle_complete(pb_adv_cid); 689 break; 690 default: 691 printf("TODO: handle provisioning state %x\n", provisioner_state); 692 break; 693 } 694 break; 695 default: 696 break; 697 } 698 provisioning_run(); 699 } 700 701 static void prov_key_generated(void * arg){ 702 UNUSED(arg); 703 printf("ECC-P256: "); 704 printf_hexdump(prov_ec_q, sizeof(prov_ec_q)); 705 // allow override 706 if (prov_public_key_oob_available){ 707 printf("Replace generated ECC with Public Key OOB:"); 708 memcpy(prov_ec_q, prov_public_key_oob_q, 64); 709 printf_hexdump(prov_ec_q, sizeof(prov_ec_q)); 710 btstack_crypto_ecc_p256_set_key(prov_public_key_oob_q, prov_public_key_oob_d); 711 } 712 } 713 714 void provisioning_provisioner_init(void){ 715 pb_adv_cid = MESH_PB_TRANSPORT_INVALID_CID; 716 pb_adv_init(); 717 pb_adv_register_packet_handler(&provisioning_handle_pdu); 718 } 719 720 void provisioning_provisioner_register_packet_handler(btstack_packet_handler_t packet_handler){ 721 prov_packet_handler = packet_handler; 722 } 723 724 uint16_t provisioning_provisioner_start_provisioning(const uint8_t * device_uuid){ 725 // generate new public key 726 btstack_crypto_ecc_p256_generate_key(&prov_ecc_p256_request, prov_ec_q, &prov_key_generated, NULL); 727 728 if (pb_adv_cid == MESH_PB_TRANSPORT_INVALID_CID) { 729 pb_adv_cid = pb_adv_create_link(device_uuid); 730 } 731 return pb_adv_cid; 732 } 733 734 void provisioning_provisioner_set_static_oob(uint16_t pb_adv_cid, uint16_t static_oob_len, const uint8_t * static_oob_data){ 735 UNUSED(pb_adv_cid); 736 prov_static_oob_data = static_oob_data; 737 prov_static_oob_len = btstack_min(static_oob_len, 16); 738 } 739 740 uint8_t provisioning_provisioner_select_authentication_method(uint16_t pb_adv_cid, uint8_t algorithm, uint8_t public_key_used, uint8_t authentication_method, uint8_t authentication_action, uint8_t authentication_size){ 741 742 if (provisioner_state != PROVISIONER_W4_AUTH_CONFIGURATION) return ERROR_CODE_COMMAND_DISALLOWED; 743 744 prov_start_algorithm = algorithm; 745 prov_start_public_key_used = public_key_used; 746 prov_start_authentication_method = authentication_method; 747 prov_start_authentication_action = authentication_action; 748 prov_start_authentication_size = authentication_size; 749 provisioner_state = PROVISIONER_SEND_START; 750 751 return ERROR_CODE_SUCCESS; 752 } 753 754 uint8_t provisioning_provisioner_public_key_oob_received(uint16_t pb_adv_cid, const uint8_t * public_key){ 755 756 if (provisioner_state != PROVISIONER_W4_PUB_KEY_OOB) return ERROR_CODE_COMMAND_DISALLOWED; 757 758 // store for confirmation inputs: len 64 759 memcpy(&prov_confirmation_inputs[81], public_key, 64); 760 761 // store remote q 762 memcpy(remote_ec_q, public_key, sizeof(remote_ec_q)); 763 764 // continue procedure 765 provisioner_state = PROVISIONER_SEND_PUB_KEY; 766 provisioning_run(); 767 768 return ERROR_CODE_SUCCESS; 769 } 770 771 void provisioning_provisioner_input_oob_complete_numeric(uint16_t pb_adv_cid, uint32_t input_oob){ 772 UNUSED(pb_adv_cid); 773 if (provisioner_state != PROVISIONER_W4_INPUT_OOK) return; 774 775 // store input_oob as auth value 776 big_endian_store_32(auth_value, 12, input_oob); 777 provisioning_handle_auth_value_ready(); 778 } 779 780 void provisioning_provisioner_input_oob_complete_alphanumeric(uint16_t pb_adv_cid, const uint8_t * input_oob_data, uint16_t input_oob_len){ 781 UNUSED(pb_adv_cid); 782 if (provisioner_state != PROVISIONER_W4_INPUT_OOK) return; 783 784 // store input_oob and fillup with zeros 785 input_oob_len = btstack_min(input_oob_len, 16); 786 memset(auth_value, 0, 16); 787 memcpy(auth_value, input_oob_data, input_oob_len); 788 provisioning_handle_auth_value_ready(); 789 } 790 791