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_device.c" 39 40 #include <stdint.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "btstack.h" 46 #include "btstack_memory.h" 47 48 #include "mesh/mesh_crypto.h" 49 #ifdef ENABLE_MESH_ADV_BEARER 50 #include "mesh/pb_adv.h" 51 #endif 52 #ifdef ENABLE_MESH_GATT_BEARER 53 #include "mesh/pb_gatt.h" 54 #endif 55 #include "mesh/provisioning.h" 56 57 static void prov_key_generated(void * arg); 58 59 // remote ecc 60 static uint8_t remote_ec_q[64]; 61 static uint8_t dhkey[32]; 62 63 static btstack_packet_handler_t prov_packet_handler; 64 65 static uint8_t prov_buffer_out[MESH_PROV_MAX_PROXY_PDU]; 66 // ConfirmationInputs = ProvisioningInvitePDUValue || ProvisioningCapabilitiesPDUValue || ProvisioningStartPDUValue || PublicKeyProvisioner || PublicKeyDevice 67 static uint8_t prov_confirmation_inputs[1 + 11 + 5 + 64 + 64]; 68 static uint8_t prov_authentication_method; 69 static uint8_t prov_public_key_oob_used; 70 static uint8_t prov_emit_public_key_oob_active; 71 static uint8_t prov_emit_output_oob_active; 72 static uint8_t prov_ec_q[64]; 73 74 static const uint8_t * prov_public_key_oob_q; 75 static const uint8_t * prov_public_key_oob_d; 76 77 // num elements 78 static uint8_t prov_num_elements = 1; 79 80 // capabilites 81 static const uint8_t * prov_static_oob_data; 82 83 static uint16_t prov_static_oob_len; 84 static uint16_t prov_output_oob_actions; 85 static uint16_t prov_input_oob_actions; 86 static uint8_t prov_public_key_oob_available; 87 static uint8_t prov_static_oob_available; 88 static uint8_t prov_output_oob_size; 89 static uint8_t prov_input_oob_size; 90 static uint8_t prov_error_code; 91 static uint8_t prov_waiting_for_outgoing_complete; 92 93 static uint8_t prov_attention_timer_timeout; 94 95 static btstack_timer_source_t prov_protocol_timer; 96 97 static btstack_crypto_aes128_cmac_t prov_cmac_request; 98 static btstack_crypto_random_t prov_random_request; 99 static btstack_crypto_ecc_p256_t prov_ecc_p256_request; 100 static btstack_crypto_ccm_t prov_ccm_request; 101 102 // ConfirmationDevice 103 static uint8_t confirmation_device[16]; 104 // ConfirmationSalt 105 static uint8_t confirmation_salt[16]; 106 // ConfirmationKey 107 static uint8_t confirmation_key[16]; 108 // RandomDevice 109 static uint8_t random_device[16]; 110 // ProvisioningSalt 111 static uint8_t provisioning_salt[16]; 112 // AuthValue 113 static uint8_t auth_value[16]; 114 // SessionKey 115 static uint8_t session_key[16]; 116 // SessionNonce 117 static uint8_t session_nonce[16]; 118 // EncProvisioningData 119 static uint8_t enc_provisioning_data[25]; 120 // ProvisioningData 121 static uint8_t provisioning_data[25]; 122 123 // received network_key 124 static mesh_network_key_t * network_key; 125 126 // DeviceKey 127 static uint8_t device_key[16]; 128 129 static uint8_t flags; 130 131 static uint32_t iv_index; 132 static uint16_t unicast_address; 133 134 typedef enum { 135 DEVICE_W4_INVITE, 136 DEVICE_SEND_CAPABILITIES, 137 DEVICE_W4_START, 138 DEVICE_W4_INPUT_OOK, 139 DEVICE_SEND_INPUT_COMPLETE, 140 DEVICE_W4_PUB_KEY, 141 DEVICE_SEND_PUB_KEY, 142 DEVICE_W4_CONFIRM, 143 DEVICE_SEND_CONFIRM, 144 DEVICE_W4_RANDOM, 145 DEVICE_SEND_RANDOM, 146 DEVICE_W4_DATA, 147 DEVICE_SEND_COMPLETE, 148 DEVICE_SEND_ERROR, 149 } device_state_t; 150 151 static device_state_t device_state; 152 static uint16_t pb_transport_cid; 153 static mesh_pb_type_t pb_type; 154 155 static void pb_send_pdu(uint16_t transport_cid, const uint8_t * buffer, uint16_t buffer_size){ 156 switch (pb_type){ 157 #ifdef ENABLE_MESH_ADV_BEARER 158 case MESH_PB_TYPE_ADV: 159 pb_adv_send_pdu(transport_cid, buffer, buffer_size); 160 break; 161 #endif 162 #ifdef ENABLE_MESH_GATT_BEARER 163 case MESH_PB_TYPE_GATT: 164 pb_gatt_send_pdu(transport_cid, buffer, buffer_size); 165 break; 166 #endif 167 default: 168 break; 169 } 170 } 171 172 static void pb_close_link(uint16_t transport_cid, uint8_t reason){ 173 switch (pb_type){ 174 #ifdef ENABLE_MESH_ADV_BEARER 175 case MESH_PB_TYPE_ADV: 176 pb_adv_close_link(transport_cid, reason); 177 break; 178 #endif 179 #ifdef ENABLE_MESH_GATT_BEARER 180 case MESH_PB_TYPE_GATT: 181 pb_gatt_close_link(transport_cid, reason); 182 break; 183 #endif 184 default: 185 break; 186 } 187 } 188 189 static void provisioning_emit_event(uint16_t pb_adv_cid, uint8_t mesh_subevent){ 190 if (!prov_packet_handler) return; 191 uint8_t event[5] = { HCI_EVENT_MESH_META, 3, mesh_subevent}; 192 little_endian_store_16(event, 3, pb_adv_cid); 193 prov_packet_handler(HCI_EVENT_PACKET, 0, event, sizeof(event)); 194 } 195 196 static void provisioning_emit_output_oob_event(uint16_t pb_adv_cid, uint32_t number){ 197 if (!prov_packet_handler) return; 198 uint8_t event[9] = { HCI_EVENT_MESH_META, 7, MESH_SUBEVENT_PB_PROV_START_EMIT_OUTPUT_OOB}; 199 little_endian_store_16(event, 3, pb_adv_cid); 200 little_endian_store_32(event, 5, number); 201 prov_packet_handler(HCI_EVENT_PACKET, 0, event, sizeof(event)); 202 } 203 204 static void provisioning_emit_attention_timer_event(uint16_t pb_adv_cid, uint8_t timer_s){ 205 if (!prov_packet_handler) return; 206 uint8_t event[6] = { HCI_EVENT_MESH_META, 4, MESH_SUBEVENT_PB_PROV_ATTENTION_TIMER}; 207 little_endian_store_16(event, 3, pb_adv_cid); 208 event[5] = timer_s; 209 prov_packet_handler(HCI_EVENT_PACKET, 0, event, sizeof(event)); 210 } 211 212 static void provisiong_timer_handler(btstack_timer_source_t * ts){ 213 UNUSED(ts); 214 printf("Provisioning Protocol Timeout -> Close Link!\n"); 215 pb_close_link(1, 1); 216 } 217 218 // The provisioning protocol shall have a minimum timeout of 60 seconds that is reset 219 // each time a provisioning protocol PDU is sent or received 220 static void provisioning_timer_start(void){ 221 btstack_run_loop_remove_timer(&prov_protocol_timer); 222 btstack_run_loop_set_timer_handler(&prov_protocol_timer, &provisiong_timer_handler); 223 btstack_run_loop_set_timer(&prov_protocol_timer, PROVISIONING_PROTOCOL_TIMEOUT_MS); 224 btstack_run_loop_add_timer(&prov_protocol_timer); 225 } 226 227 static void provisioning_timer_stop(void){ 228 btstack_run_loop_remove_timer(&prov_protocol_timer); 229 } 230 231 232 // Outgoing Provisioning PDUs 233 static void provisioning_send_provisioning_error(void){ 234 // setup response 235 prov_buffer_out[0] = MESH_PROV_FAILED; 236 prov_buffer_out[1] = prov_error_code; 237 pb_send_pdu(pb_transport_cid, prov_buffer_out, 2); 238 } 239 240 static void provisioning_send_capabilites(void){ 241 // setup response 242 prov_buffer_out[0] = MESH_PROV_CAPABILITIES; 243 244 /* Number of Elements supported */ 245 prov_buffer_out[1] = prov_num_elements; 246 247 /* Supported algorithms - FIPS P-256 Eliptic Curve */ 248 big_endian_store_16(prov_buffer_out, 2, 1); 249 250 /* Public Key Type - Public Key OOB information available */ 251 prov_buffer_out[4] = prov_public_key_oob_available; 252 253 /* Static OOB Type - Static OOB information available */ 254 prov_buffer_out[5] = prov_static_oob_available; 255 256 /* Output OOB Size - max of 8 */ 257 prov_buffer_out[6] = prov_output_oob_size; 258 259 /* Output OOB Action */ 260 big_endian_store_16(prov_buffer_out, 7, prov_output_oob_actions); 261 262 /* Input OOB Size - max of 8*/ 263 prov_buffer_out[9] = prov_input_oob_size; 264 265 /* Input OOB Action */ 266 big_endian_store_16(prov_buffer_out, 10, prov_input_oob_actions); 267 268 // store for confirmation inputs: len 11 269 memcpy(&prov_confirmation_inputs[1], &prov_buffer_out[1], 11); 270 271 // send 272 273 pb_send_pdu(pb_transport_cid, prov_buffer_out, 12); 274 } 275 276 static void provisioning_send_public_key(void){ 277 // setup response 278 prov_buffer_out[0] = MESH_PROV_PUB_KEY; 279 memcpy(&prov_buffer_out[1], prov_ec_q, 64); 280 281 // store for confirmation inputs: len 64 282 memcpy(&prov_confirmation_inputs[81], &prov_buffer_out[1], 64); 283 284 // send 285 pb_send_pdu(pb_transport_cid, prov_buffer_out, 65); 286 } 287 288 static void provisioning_send_input_complete(void){ 289 // setup response 290 prov_buffer_out[0] = MESH_PROV_INPUT_COMPLETE; 291 292 // send 293 pb_send_pdu(pb_transport_cid, prov_buffer_out, 17); 294 } 295 static void provisioning_send_confirm(void){ 296 // setup response 297 prov_buffer_out[0] = MESH_PROV_CONFIRM; 298 memcpy(&prov_buffer_out[1], confirmation_device, 16); 299 300 // send 301 pb_send_pdu(pb_transport_cid, prov_buffer_out, 17); 302 } 303 304 static void provisioning_send_random(void){ 305 // setup response 306 prov_buffer_out[0] = MESH_PROV_RANDOM; 307 memcpy(&prov_buffer_out[1], random_device, 16); 308 309 // send pdu 310 pb_send_pdu(pb_transport_cid, prov_buffer_out, 17); 311 } 312 313 static void provisioning_send_complete(void){ 314 // setup response 315 prov_buffer_out[0] = MESH_PROV_COMPLETE; 316 317 // send pdu 318 pb_send_pdu(pb_transport_cid, prov_buffer_out, 1); 319 } 320 321 static void provisioning_done(void){ 322 if (prov_emit_public_key_oob_active){ 323 prov_emit_public_key_oob_active = 0; 324 provisioning_emit_event(1, MESH_SUBEVENT_PB_PROV_STOP_EMIT_PUBLIC_KEY_OOB); 325 } 326 if (prov_emit_output_oob_active){ 327 prov_emit_output_oob_active = 0; 328 provisioning_emit_event(1, MESH_SUBEVENT_PB_PROV_STOP_EMIT_OUTPUT_OOB); 329 } 330 if (prov_attention_timer_timeout){ 331 prov_attention_timer_timeout = 0; 332 provisioning_emit_attention_timer_event(1, 0); 333 } 334 device_state = DEVICE_W4_INVITE; 335 336 // generate new public key 337 printf("Generate new public key\n"); 338 btstack_crypto_ecc_p256_generate_key(&prov_ecc_p256_request, prov_ec_q, &prov_key_generated, NULL); 339 } 340 341 static void provisioning_handle_auth_value_output_oob(void * arg){ 342 UNUSED(arg); 343 // limit auth value to single digit 344 auth_value[15] = auth_value[15] % 9 + 1; 345 346 printf("Output OOB: %u\n", auth_value[15]); 347 348 // emit output oob value 349 provisioning_emit_output_oob_event(1, auth_value[15]); 350 prov_emit_output_oob_active = 1; 351 } 352 353 static void provisioning_public_key_exchange_complete(void){ 354 355 // reset auth_value 356 memset(auth_value, 0, sizeof(auth_value)); 357 358 // handle authentication method 359 switch (prov_authentication_method){ 360 case 0x00: 361 device_state = DEVICE_W4_CONFIRM; 362 break; 363 case 0x01: 364 memcpy(&auth_value[16-prov_static_oob_len], prov_static_oob_data, prov_static_oob_len); 365 device_state = DEVICE_W4_CONFIRM; 366 break; 367 case 0x02: 368 device_state = DEVICE_W4_CONFIRM; 369 printf("Generate random for auth_value\n"); 370 // generate single byte of random data to use for authentication 371 btstack_crypto_random_generate(&prov_random_request, &auth_value[15], 1, &provisioning_handle_auth_value_output_oob, NULL); 372 break; 373 case 0x03: 374 // Input OOB 375 printf("Input OOB requested\n"); 376 provisioning_emit_event(1, MESH_SUBEVENT_PB_PROV_INPUT_OOB_REQUEST); 377 device_state = DEVICE_W4_INPUT_OOK; 378 break; 379 default: 380 break; 381 } 382 } 383 384 static void provisioning_run(void){ 385 printf("provisioning_run: state %x, wait for outgoing complete %u\n", device_state, prov_waiting_for_outgoing_complete); 386 if (prov_waiting_for_outgoing_complete) return; 387 int start_timer = 1; 388 switch (device_state){ 389 case DEVICE_SEND_ERROR: 390 start_timer = 0; // game over 391 prov_waiting_for_outgoing_complete = 1; 392 provisioning_send_provisioning_error(); 393 provisioning_done(); 394 break; 395 case DEVICE_SEND_CAPABILITIES: 396 device_state = DEVICE_W4_START; 397 prov_waiting_for_outgoing_complete = 1; 398 provisioning_send_capabilites(); 399 break; 400 case DEVICE_SEND_INPUT_COMPLETE: 401 device_state = DEVICE_W4_CONFIRM; 402 prov_waiting_for_outgoing_complete = 1; 403 provisioning_send_input_complete(); 404 break; 405 case DEVICE_SEND_PUB_KEY: 406 prov_waiting_for_outgoing_complete = 1; 407 provisioning_send_public_key(); 408 provisioning_public_key_exchange_complete(); 409 break; 410 case DEVICE_SEND_CONFIRM: 411 device_state = DEVICE_W4_RANDOM; 412 prov_waiting_for_outgoing_complete = 1; 413 provisioning_send_confirm(); 414 break; 415 case DEVICE_SEND_RANDOM: 416 device_state = DEVICE_W4_DATA; 417 prov_waiting_for_outgoing_complete = 1; 418 provisioning_send_random(); 419 break; 420 case DEVICE_SEND_COMPLETE: 421 start_timer = 0; // last message 422 prov_waiting_for_outgoing_complete = 1; 423 provisioning_send_complete(); 424 provisioning_done(); 425 break; 426 default: 427 return; 428 } 429 if (start_timer){ 430 provisioning_timer_start(); 431 } 432 } 433 434 static void provisioning_handle_provisioning_error(uint8_t error_code){ 435 printf("PROVISIONING ERROR\n"); 436 provisioning_timer_stop(); 437 prov_error_code = error_code; 438 device_state = DEVICE_SEND_ERROR; 439 provisioning_run(); 440 } 441 442 static void provisioning_handle_invite(uint8_t *packet, uint16_t size){ 443 444 if (size != 1) return; 445 446 // store for confirmation inputs: len 1 447 memcpy(&prov_confirmation_inputs[0], packet, 1); 448 449 // handle invite message 450 prov_attention_timer_timeout = packet[0]; 451 if (prov_attention_timer_timeout){ 452 provisioning_emit_attention_timer_event(pb_transport_cid, prov_attention_timer_timeout); 453 } 454 455 device_state = DEVICE_SEND_CAPABILITIES; 456 provisioning_run(); 457 } 458 459 static void provisioning_handle_start(uint8_t * packet, uint16_t size){ 460 461 if (size != 5) return; 462 463 // validate Algorithm 464 int ok = 1; 465 if (packet[0] > 0x00){ 466 ok = 0; 467 } 468 // validate Publik Key 469 if (packet[1] > 0x01){ 470 ok = 0; 471 } 472 // validate Authentication Method 473 switch (packet[2]){ 474 case 0: 475 case 1: 476 if (packet[3] != 0 || packet[4] != 0){ 477 ok = 0; 478 break; 479 } 480 break; 481 case 2: 482 if (packet[3] > 0x04 || packet[4] == 0 || packet[4] > 0x08){ 483 ok = 0; 484 break; 485 } 486 break; 487 case 3: 488 if (packet[3] > 0x03 || packet[4] == 0 || packet[4] > 0x08){ 489 ok = 0; 490 break; 491 } 492 break; 493 } 494 if (!ok){ 495 printf("PROV_START arguments incorrect\n"); 496 provisioning_handle_provisioning_error(0x02); 497 return; 498 } 499 500 // store for confirmation inputs: len 5 501 memcpy(&prov_confirmation_inputs[12], packet, 5); 502 503 // public key oob 504 prov_public_key_oob_used = packet[1]; 505 506 // authentication method 507 prov_authentication_method = packet[2]; 508 509 // start emit public OOK if specified 510 if (prov_public_key_oob_available && prov_public_key_oob_used){ 511 provisioning_emit_event(1, MESH_SUBEVENT_PB_PROV_START_EMIT_PUBLIC_KEY_OOB); 512 } 513 514 printf("PublicKey: %02x\n", prov_public_key_oob_used); 515 printf("AuthMethod: %02x\n", prov_authentication_method); 516 517 device_state = DEVICE_W4_PUB_KEY; 518 provisioning_run(); 519 } 520 521 static void provisioning_handle_public_key_dhkey(void * arg){ 522 UNUSED(arg); 523 524 printf("DHKEY: "); 525 printf_hexdump(dhkey, sizeof(dhkey)); 526 527 // skip sending own public key when public key oob is used 528 if (prov_public_key_oob_available && prov_public_key_oob_used){ 529 // just copy key for confirmation inputs 530 memcpy(&prov_confirmation_inputs[81], prov_ec_q, 64); 531 provisioning_public_key_exchange_complete(); 532 } else { 533 // queue public key pdu 534 printf("DEVICE_SEND_PUB_KEY\n"); 535 device_state = DEVICE_SEND_PUB_KEY; 536 } 537 provisioning_run(); 538 } 539 540 static void provisioning_handle_public_key(uint8_t *packet, uint16_t size){ 541 542 // validate public key 543 if (size != sizeof(remote_ec_q) || btstack_crypto_ecc_p256_validate_public_key(packet) != 0){ 544 printf("Public Key invalid, abort provisioning\n"); 545 provisioning_handle_provisioning_error(0x07); // Unexpected Error 546 return; 547 } 548 549 // stop emit public OOK if specified and send to crypto module 550 if (prov_public_key_oob_available && prov_public_key_oob_used){ 551 provisioning_emit_event(1, MESH_SUBEVENT_PB_PROV_STOP_EMIT_PUBLIC_KEY_OOB); 552 553 printf("Replace generated ECC with Public Key OOB:"); 554 memcpy(prov_ec_q, prov_public_key_oob_q, 64); 555 printf_hexdump(prov_ec_q, sizeof(prov_ec_q)); 556 btstack_crypto_ecc_p256_set_key(prov_public_key_oob_q, prov_public_key_oob_d); 557 } 558 559 // store for confirmation inputs: len 64 560 memcpy(&prov_confirmation_inputs[17], packet, 64); 561 562 // store remote q 563 memcpy(remote_ec_q, packet, sizeof(remote_ec_q)); 564 565 // calculate DHKey 566 btstack_crypto_ecc_p256_calculate_dhkey(&prov_ecc_p256_request, remote_ec_q, dhkey, provisioning_handle_public_key_dhkey, NULL); 567 } 568 569 static void provisioning_handle_confirmation_device_calculated(void * arg){ 570 UNUSED(arg); 571 572 printf("ConfirmationDevice: "); 573 printf_hexdump(confirmation_device, sizeof(confirmation_device)); 574 575 device_state = DEVICE_SEND_CONFIRM; 576 provisioning_run(); 577 } 578 579 static void provisioning_handle_confirmation_random_device(void * arg){ 580 UNUSED(arg); 581 582 // re-use prov_confirmation_inputs buffer 583 memcpy(&prov_confirmation_inputs[0], random_device, 16); 584 memcpy(&prov_confirmation_inputs[16], auth_value, 16); 585 586 // calc confirmation device 587 btstack_crypto_aes128_cmac_message(&prov_cmac_request, confirmation_key, 32, prov_confirmation_inputs, confirmation_device, &provisioning_handle_confirmation_device_calculated, NULL); 588 } 589 590 static void provisioning_handle_confirmation_k1_calculated(void * arg){ 591 UNUSED(arg); 592 593 printf("ConfirmationKey: "); 594 printf_hexdump(confirmation_key, sizeof(confirmation_key)); 595 596 printf("AuthValue: "); 597 printf_hexdump(auth_value, 16); 598 599 // generate random_device 600 btstack_crypto_random_generate(&prov_random_request,random_device, 16, &provisioning_handle_confirmation_random_device, NULL); 601 } 602 603 static void provisioning_handle_confirmation_s1_calculated(void * arg){ 604 UNUSED(arg); 605 606 // ConfirmationSalt 607 printf("ConfirmationSalt: "); 608 printf_hexdump(confirmation_salt, sizeof(confirmation_salt)); 609 610 // ConfirmationKey 611 mesh_k1(&prov_cmac_request, dhkey, sizeof(dhkey), confirmation_salt, (const uint8_t*) "prck", 4, confirmation_key, &provisioning_handle_confirmation_k1_calculated, NULL); 612 } 613 614 static void provisioning_handle_confirmation(uint8_t *packet, uint16_t size){ 615 UNUSED(size); 616 UNUSED(packet); 617 618 // 619 if (prov_emit_output_oob_active){ 620 prov_emit_output_oob_active = 0; 621 provisioning_emit_event(1, MESH_SUBEVENT_PB_PROV_STOP_EMIT_OUTPUT_OOB); 622 } 623 624 // CalculationInputs 625 printf("ConfirmationInputs: "); 626 printf_hexdump(prov_confirmation_inputs, sizeof(prov_confirmation_inputs)); 627 628 // calculate s1 629 btstack_crypto_aes128_cmac_zero(&prov_cmac_request, sizeof(prov_confirmation_inputs), prov_confirmation_inputs, confirmation_salt, &provisioning_handle_confirmation_s1_calculated, NULL); 630 } 631 632 // PROV_RANDOM 633 static void provisioning_handle_random_session_nonce_calculated(void * arg){ 634 UNUSED(arg); 635 636 // The nonce shall be the 13 least significant octets == zero most significant octets 637 uint8_t temp[13]; 638 memcpy(temp, &session_nonce[3], 13); 639 memcpy(session_nonce, temp, 13); 640 641 // SessionNonce 642 printf("SessionNonce: "); 643 printf_hexdump(session_nonce, 13); 644 645 device_state = DEVICE_SEND_RANDOM; 646 provisioning_run(); 647 } 648 649 static void provisioning_handle_random_session_key_calculated(void * arg){ 650 UNUSED(arg); 651 652 // SessionKey 653 printf("SessionKey: "); 654 printf_hexdump(session_key, sizeof(session_key)); 655 656 // SessionNonce 657 mesh_k1(&prov_cmac_request, dhkey, sizeof(dhkey), provisioning_salt, (const uint8_t*) "prsn", 4, session_nonce, &provisioning_handle_random_session_nonce_calculated, NULL); 658 } 659 660 static void provisioning_handle_random_s1_calculated(void * arg){ 661 662 UNUSED(arg); 663 664 // ProvisioningSalt 665 printf("ProvisioningSalt: "); 666 printf_hexdump(provisioning_salt, sizeof(provisioning_salt)); 667 668 // SessionKey 669 mesh_k1(&prov_cmac_request, dhkey, sizeof(dhkey), provisioning_salt, (const uint8_t*) "prsk", 4, session_key, &provisioning_handle_random_session_key_calculated, NULL); 670 } 671 672 static void provisioning_handle_random(uint8_t *packet, uint16_t size){ 673 674 UNUSED(size); 675 UNUSED(packet); 676 677 // TODO: validate Confirmation 678 679 // calc ProvisioningSalt = s1(ConfirmationSalt || RandomProvisioner || RandomDevice) 680 memcpy(&prov_confirmation_inputs[0], confirmation_salt, 16); 681 memcpy(&prov_confirmation_inputs[16], packet, 16); 682 memcpy(&prov_confirmation_inputs[32], random_device, 16); 683 btstack_crypto_aes128_cmac_zero(&prov_cmac_request, 48, prov_confirmation_inputs, provisioning_salt, &provisioning_handle_random_s1_calculated, NULL); 684 } 685 686 // PROV_DATA 687 static void provisioning_handle_network_dervived(void * arg){ 688 UNUSED(arg); 689 690 provisioning_timer_stop(); 691 692 // notify client 693 provisioning_emit_event(1, MESH_SUBEVENT_PB_PROV_COMPLETE); 694 695 device_state = DEVICE_SEND_COMPLETE; 696 provisioning_run(); 697 698 } 699 700 static void provisioning_handle_data_device_key(void * arg){ 701 UNUSED(arg); 702 703 // derive full network key 704 mesh_network_key_derive(&prov_cmac_request, network_key, &provisioning_handle_network_dervived, NULL); 705 } 706 707 static void provisioning_handle_data_ccm(void * arg){ 708 709 UNUSED(arg); 710 711 // TODO: validate MIC? 712 uint8_t mic[8]; 713 btstack_crypto_ccm_get_authentication_value(&prov_ccm_request, mic); 714 printf("MIC: "); 715 printf_hexdump(mic, 8); 716 717 // allocate network key 718 network_key = btstack_memory_mesh_network_key_get(); 719 720 // sort provisoning data 721 memcpy(network_key->net_key, provisioning_data, 16); 722 network_key->netkey_index = big_endian_read_16(provisioning_data, 16); 723 // assume free index available for very first network key 724 network_key->internal_index = mesh_network_key_get_free_index(); 725 flags = provisioning_data[18]; 726 iv_index = big_endian_read_32(provisioning_data, 19); 727 unicast_address = big_endian_read_16(provisioning_data, 23); 728 729 // DeviceKey 730 mesh_k1(&prov_cmac_request, dhkey, sizeof(dhkey), provisioning_salt, (const uint8_t*) "prdk", 4, device_key, &provisioning_handle_data_device_key, NULL); 731 } 732 733 static void provisioning_handle_data(uint8_t *packet, uint16_t size){ 734 735 UNUSED(size); 736 737 memcpy(enc_provisioning_data, packet, 25); 738 739 // decode response 740 btstack_crypto_ccm_init(&prov_ccm_request, session_key, session_nonce, 25, 0, 8); 741 btstack_crypto_ccm_decrypt_block(&prov_ccm_request, 25, enc_provisioning_data, provisioning_data, &provisioning_handle_data_ccm, NULL); 742 } 743 744 static void provisioning_handle_unexpected_pdu(uint8_t *packet, uint16_t size){ 745 UNUSED(size); 746 printf("Unexpected PDU #%u in state #%u\n", packet[0], (int) device_state); 747 provisioning_handle_provisioning_error(0x03); 748 } 749 750 static void provisioning_handle_pdu(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 751 UNUSED(channel); 752 753 if (size < 1) return; 754 755 switch (packet_type){ 756 case HCI_EVENT_PACKET: 757 if (packet[0] != HCI_EVENT_MESH_META) break; 758 switch (packet[2]){ 759 case MESH_SUBEVENT_PB_TRANSPORT_LINK_OPEN: 760 pb_transport_cid = mesh_subevent_pb_transport_link_open_get_pb_transport_cid(packet); 761 pb_type = mesh_subevent_pb_transport_link_open_get_pb_type(packet); 762 printf("Link opened, reset state, transport cid 0x%02x, PB type %d\n", pb_transport_cid, pb_type); 763 provisioning_done(); 764 break; 765 case MESH_SUBEVENT_PB_TRANSPORT_PDU_SENT: 766 printf("Outgoing packet acked\n"); 767 prov_waiting_for_outgoing_complete = 0; 768 break; 769 case MESH_SUBEVENT_PB_TRANSPORT_LINK_CLOSED: 770 printf("Link close, reset state\n"); 771 pb_transport_cid = MESH_PB_TRANSPORT_INVALID_CID; 772 provisioning_done(); 773 break; 774 } 775 break; 776 case PROVISIONING_DATA_PACKET: 777 // check state 778 switch (device_state){ 779 case DEVICE_W4_INVITE: 780 if (packet[0] != MESH_PROV_INVITE) provisioning_handle_unexpected_pdu(packet, size); 781 printf("MESH_PROV_INVITE: "); 782 printf_hexdump(&packet[1], size-1); 783 provisioning_handle_invite(&packet[1], size-1); 784 break; 785 case DEVICE_W4_START: 786 if (packet[0] != MESH_PROV_START) provisioning_handle_unexpected_pdu(packet, size); 787 printf("MESH_PROV_START: "); 788 printf_hexdump(&packet[1], size-1); 789 provisioning_handle_start(&packet[1], size-1); 790 break; 791 case DEVICE_W4_PUB_KEY: 792 if (packet[0] != MESH_PROV_PUB_KEY) provisioning_handle_unexpected_pdu(packet, size); 793 printf("MESH_PROV_PUB_KEY: "); 794 printf_hexdump(&packet[1], size-1); 795 provisioning_handle_public_key(&packet[1], size-1); 796 break; 797 case DEVICE_W4_CONFIRM: 798 if (packet[0] != MESH_PROV_CONFIRM) provisioning_handle_unexpected_pdu(packet, size); 799 printf("MESH_PROV_CONFIRM: "); 800 printf_hexdump(&packet[1], size-1); 801 provisioning_handle_confirmation(&packet[1], size-1); 802 break; 803 case DEVICE_W4_RANDOM: 804 if (packet[0] != MESH_PROV_RANDOM) provisioning_handle_unexpected_pdu(packet, size); 805 printf("MESH_PROV_RANDOM: "); 806 printf_hexdump(&packet[1], size-1); 807 provisioning_handle_random(&packet[1], size-1); 808 break; 809 case DEVICE_W4_DATA: 810 if (packet[0] != MESH_PROV_DATA) provisioning_handle_unexpected_pdu(packet, size); 811 printf("MESH_PROV_DATA: "); 812 provisioning_handle_data(&packet[1], size-1); 813 break; 814 default: 815 break; 816 } 817 break; 818 default: 819 break; 820 } 821 provisioning_run(); 822 } 823 824 static void prov_key_generated(void * arg){ 825 UNUSED(arg); 826 printf("ECC-P256: "); 827 printf_hexdump(prov_ec_q, sizeof(prov_ec_q)); 828 // allow override 829 if (prov_public_key_oob_available){ 830 printf("Replace generated ECC with Public Key OOB:"); 831 memcpy(prov_ec_q, prov_public_key_oob_q, 64); 832 printf_hexdump(prov_ec_q, sizeof(prov_ec_q)); 833 btstack_crypto_ecc_p256_set_key(prov_public_key_oob_q, prov_public_key_oob_d); 834 } 835 } 836 837 void provisioning_device_init(void){ 838 #ifdef ENABLE_MESH_ADV_BEARER 839 // setup PB ADV 840 pb_adv_init(); 841 pb_adv_register_packet_handler(&provisioning_handle_pdu); 842 #endif 843 #ifdef ENABLE_MESH_GATT_BEARER 844 // setup PB GATT 845 pb_gatt_init(); 846 pb_gatt_register_packet_handler(&provisioning_handle_pdu); 847 #endif 848 849 pb_transport_cid = MESH_PB_TRANSPORT_INVALID_CID; 850 851 // init provisioning state 852 provisioning_done(); 853 854 // generate public key 855 btstack_crypto_ecc_p256_generate_key(&prov_ecc_p256_request, prov_ec_q, &prov_key_generated, NULL); 856 } 857 858 void provisioning_device_register_packet_handler(btstack_packet_handler_t packet_handler){ 859 prov_packet_handler = packet_handler; 860 } 861 862 void provisioning_device_set_public_key_oob(const uint8_t * public_key, const uint8_t * private_key){ 863 prov_public_key_oob_q = public_key; 864 prov_public_key_oob_d = private_key; 865 prov_public_key_oob_available = 1; 866 btstack_crypto_ecc_p256_set_key(prov_public_key_oob_q, prov_public_key_oob_d); 867 } 868 869 void provisioning_device_set_static_oob(uint16_t static_oob_len, const uint8_t * static_oob_data){ 870 prov_static_oob_available = 1; 871 prov_static_oob_data = static_oob_data; 872 prov_static_oob_len = btstack_min(static_oob_len, 16); 873 } 874 875 void provisioning_device_set_output_oob_actions(uint16_t supported_output_oob_action_types, uint8_t max_oob_output_size){ 876 prov_output_oob_actions = supported_output_oob_action_types; 877 prov_output_oob_size = max_oob_output_size; 878 } 879 880 void provisioning_device_set_input_oob_actions(uint16_t supported_input_oob_action_types, uint8_t max_oob_input_size){ 881 prov_input_oob_actions = supported_input_oob_action_types; 882 prov_input_oob_size = max_oob_input_size; 883 } 884 885 void provisioning_device_input_oob_complete_numeric(uint16_t pb_adv_cid, uint32_t input_oob){ 886 UNUSED(pb_adv_cid); 887 if (device_state != DEVICE_W4_INPUT_OOK) return; 888 889 // store input_oob as auth value 890 big_endian_store_32(auth_value, 12, input_oob); 891 device_state = DEVICE_SEND_INPUT_COMPLETE; 892 provisioning_run(); 893 } 894 895 void provisioning_device_input_oob_complete_alphanumeric(uint16_t pb_adv_cid, const uint8_t * input_oob_data, uint16_t input_oob_len){ 896 UNUSED(pb_adv_cid); 897 if (device_state != DEVICE_W4_INPUT_OOK) return; 898 899 // store input_oob and fillup with zeros 900 input_oob_len = btstack_min(input_oob_len, 16); 901 memset(auth_value, 0, 16); 902 memcpy(auth_value, input_oob_data, input_oob_len); 903 device_state = DEVICE_SEND_INPUT_COMPLETE; 904 provisioning_run(); 905 } 906 907 void provisioning_device_data_get(mesh_provisioning_data_t * the_provisioning_data){ 908 the_provisioning_data->unicast_address = unicast_address; 909 the_provisioning_data->iv_index = iv_index; 910 the_provisioning_data->flags = flags; 911 memcpy(the_provisioning_data->device_key, device_key, 16); 912 the_provisioning_data->network_key = network_key; 913 } 914