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 #include "mesh/pb_adv.h" 50 #include "mesh/pb_gatt.h" 51 #include "mesh/provisioning.h" 52 53 static void provisioning_attention_timer_set(void); 54 static void prov_key_generated(void * arg); 55 56 // remote ecc 57 static uint8_t remote_ec_q[64]; 58 static uint8_t dhkey[32]; 59 60 static btstack_packet_handler_t prov_packet_handler; 61 62 static uint8_t prov_buffer_out[MESH_PROV_MAX_PROXY_PDU]; 63 // ConfirmationInputs = ProvisioningInvitePDUValue || ProvisioningCapabilitiesPDUValue || ProvisioningStartPDUValue || PublicKeyProvisioner || PublicKeyDevice 64 static uint8_t prov_confirmation_inputs[1 + 11 + 5 + 64 + 64]; 65 static uint8_t prov_authentication_method; 66 static uint8_t prov_public_key_oob_used; 67 static uint8_t prov_emit_public_key_oob_active; 68 static uint8_t prov_emit_output_oob_active; 69 static uint8_t prov_ec_q[64]; 70 71 static const uint8_t * prov_public_key_oob_q; 72 static const uint8_t * prov_public_key_oob_d; 73 74 // num elements 75 static uint8_t prov_num_elements = 1; 76 77 // capabilites 78 static const uint8_t * prov_static_oob_data; 79 80 static uint16_t prov_static_oob_len; 81 static uint16_t prov_output_oob_actions; 82 static uint16_t prov_input_oob_actions; 83 static uint8_t prov_public_key_oob_available; 84 static uint8_t prov_static_oob_available; 85 static uint8_t prov_output_oob_size; 86 static uint8_t prov_input_oob_size; 87 static uint8_t prov_error_code; 88 static uint8_t prov_waiting_for_outgoing_complete; 89 90 static uint8_t prov_attention_timer_timeout; 91 static btstack_timer_source_t prov_attention_timer; 92 93 static btstack_timer_source_t prov_protocol_timer; 94 95 static btstack_crypto_aes128_cmac_t prov_cmac_request; 96 static btstack_crypto_random_t prov_random_request; 97 static btstack_crypto_ecc_p256_t prov_ecc_p256_request; 98 static btstack_crypto_ccm_t prov_ccm_request; 99 100 // ConfirmationDevice 101 static uint8_t confirmation_device[16]; 102 // ConfirmationSalt 103 static uint8_t confirmation_salt[16]; 104 // ConfirmationKey 105 static uint8_t confirmation_key[16]; 106 // RandomDevice 107 static uint8_t random_device[16]; 108 // ProvisioningSalt 109 static uint8_t provisioning_salt[16]; 110 // AuthValue 111 static uint8_t auth_value[16]; 112 // SessionKey 113 static uint8_t session_key[16]; 114 // SessionNonce 115 static uint8_t session_nonce[16]; 116 // EncProvisioningData 117 static uint8_t enc_provisioning_data[25]; 118 // ProvisioningData 119 static uint8_t provisioning_data[25]; 120 121 // received network_key 122 static mesh_network_key_t * network_key; 123 124 // DeviceKey 125 static uint8_t device_key[16]; 126 127 static uint8_t flags; 128 129 static uint32_t iv_index; 130 static uint16_t unicast_address; 131 132 typedef enum { 133 DEVICE_W4_INVITE, 134 DEVICE_SEND_CAPABILITIES, 135 DEVICE_W4_START, 136 DEVICE_W4_INPUT_OOK, 137 DEVICE_SEND_INPUT_COMPLETE, 138 DEVICE_W4_PUB_KEY, 139 DEVICE_SEND_PUB_KEY, 140 DEVICE_W4_CONFIRM, 141 DEVICE_SEND_CONFIRM, 142 DEVICE_W4_RANDOM, 143 DEVICE_SEND_RANDOM, 144 DEVICE_W4_DATA, 145 DEVICE_SEND_COMPLETE, 146 DEVICE_SEND_ERROR, 147 } device_state_t; 148 149 static device_state_t device_state; 150 static uint16_t pb_transport_cid; 151 static pb_type_t pb_type; 152 153 static void pb_send_pdu(uint16_t transport_cid, const uint8_t * buffer, uint16_t buffer_size){ 154 switch (pb_type){ 155 case PB_TYPE_ADV: 156 pb_adv_send_pdu(transport_cid, buffer, buffer_size); 157 break; 158 case PB_TYPE_GATT: 159 pb_gatt_send_pdu(transport_cid, buffer, buffer_size); 160 break; 161 } 162 } 163 164 static void pb_close_link(uint16_t transport_cid, uint8_t reason){ 165 switch (pb_type){ 166 case PB_TYPE_ADV: 167 pb_adv_close_link(transport_cid, reason); 168 break; 169 case PB_TYPE_GATT: 170 pb_gatt_close_link(transport_cid, reason); 171 break; 172 } 173 } 174 175 static void provisioning_emit_event(uint16_t pb_adv_cid, uint8_t mesh_subevent){ 176 if (!prov_packet_handler) return; 177 uint8_t event[5] = { HCI_EVENT_MESH_META, 3, mesh_subevent}; 178 little_endian_store_16(event, 3, pb_adv_cid); 179 prov_packet_handler(HCI_EVENT_PACKET, 0, event, sizeof(event)); 180 } 181 182 static void provisioning_emit_output_oob_event(uint16_t pb_adv_cid, uint32_t number){ 183 if (!prov_packet_handler) return; 184 uint8_t event[9] = { HCI_EVENT_MESH_META, 7, MESH_SUBEVENT_PB_PROV_START_EMIT_OUTPUT_OOB}; 185 little_endian_store_16(event, 3, pb_adv_cid); 186 little_endian_store_16(event, 5, number); 187 prov_packet_handler(HCI_EVENT_PACKET, 0, event, sizeof(event)); 188 } 189 190 static void provisioning_emit_attention_timer_event(uint16_t pb_adv_cid, uint8_t timer_s){ 191 if (!prov_packet_handler) return; 192 uint8_t event[4] = { HCI_EVENT_MESH_META, 7, MESH_SUBEVENT_PB_PROV_ATTENTION_TIMER}; 193 event[3] = timer_s; 194 prov_packet_handler(HCI_EVENT_PACKET, 0, event, sizeof(event)); 195 } 196 197 static void provisiong_timer_handler(btstack_timer_source_t * ts){ 198 UNUSED(ts); 199 printf("Provisioning Protocol Timeout -> Close Link!\n"); 200 pb_close_link(1, 1); 201 } 202 203 // The provisioning protocol shall have a minimum timeout of 60 seconds that is reset 204 // each time a provisioning protocol PDU is sent or received 205 static void provisioning_timer_start(void){ 206 btstack_run_loop_remove_timer(&prov_protocol_timer); 207 btstack_run_loop_set_timer_handler(&prov_protocol_timer, &provisiong_timer_handler); 208 btstack_run_loop_set_timer(&prov_protocol_timer, PROVISIONING_PROTOCOL_TIMEOUT_MS); 209 btstack_run_loop_add_timer(&prov_protocol_timer); 210 } 211 212 static void provisioning_timer_stop(void){ 213 btstack_run_loop_remove_timer(&prov_protocol_timer); 214 } 215 216 static void provisioning_attention_timer_timeout(btstack_timer_source_t * ts){ 217 UNUSED(ts); 218 if (prov_attention_timer_timeout == 0) return; 219 prov_attention_timer_timeout--; 220 provisioning_attention_timer_set(); 221 } 222 223 static void provisioning_attention_timer_set(void){ 224 provisioning_emit_attention_timer_event(1, prov_attention_timer_timeout); 225 if (prov_attention_timer_timeout){ 226 btstack_run_loop_set_timer_handler(&prov_attention_timer, &provisioning_attention_timer_timeout); 227 btstack_run_loop_set_timer(&prov_attention_timer, 1000); 228 btstack_run_loop_add_timer(&prov_attention_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 // limit auth value to single digit 343 auth_value[15] = auth_value[15] % 9 + 1; 344 345 printf("Output OOB: %u\n", auth_value[15]); 346 347 // emit output oob value 348 provisioning_emit_output_oob_event(1, auth_value[15]); 349 prov_emit_output_oob_active = 1; 350 } 351 352 static void provisioning_public_key_exchange_complete(void){ 353 354 // reset auth_value 355 memset(auth_value, 0, sizeof(auth_value)); 356 357 // handle authentication method 358 switch (prov_authentication_method){ 359 case 0x00: 360 device_state = DEVICE_W4_CONFIRM; 361 break; 362 case 0x01: 363 memcpy(&auth_value[16-prov_static_oob_len], prov_static_oob_data, prov_static_oob_len); 364 device_state = DEVICE_W4_CONFIRM; 365 break; 366 case 0x02: 367 device_state = DEVICE_W4_CONFIRM; 368 printf("Generate random for auth_value\n"); 369 // generate single byte of random data to use for authentication 370 btstack_crypto_random_generate(&prov_random_request, &auth_value[15], 1, &provisioning_handle_auth_value_output_oob, NULL); 371 break; 372 case 0x03: 373 // Input OOB 374 printf("Input OOB requested\n"); 375 provisioning_emit_event(1, MESH_SUBEVENT_PB_PROV_INPUT_OOB_REQUEST); 376 device_state = DEVICE_W4_INPUT_OOK; 377 break; 378 default: 379 break; 380 } 381 } 382 383 static void provisioning_run(void){ 384 printf("provisioning_run: state %x, wait for outgoing complete %u\n", device_state, prov_waiting_for_outgoing_complete); 385 if (prov_waiting_for_outgoing_complete) return; 386 int start_timer = 1; 387 switch (device_state){ 388 case DEVICE_SEND_ERROR: 389 start_timer = 0; // game over 390 prov_waiting_for_outgoing_complete = 1; 391 provisioning_send_provisioning_error(); 392 provisioning_done(); 393 break; 394 case DEVICE_SEND_CAPABILITIES: 395 device_state = DEVICE_W4_START; 396 prov_waiting_for_outgoing_complete = 1; 397 provisioning_send_capabilites(); 398 break; 399 case DEVICE_SEND_INPUT_COMPLETE: 400 device_state = DEVICE_W4_CONFIRM; 401 prov_waiting_for_outgoing_complete = 1; 402 provisioning_send_input_complete(); 403 break; 404 case DEVICE_SEND_PUB_KEY: 405 prov_waiting_for_outgoing_complete = 1; 406 provisioning_send_public_key(); 407 provisioning_public_key_exchange_complete(); 408 break; 409 case DEVICE_SEND_CONFIRM: 410 device_state = DEVICE_W4_RANDOM; 411 prov_waiting_for_outgoing_complete = 1; 412 provisioning_send_confirm(); 413 break; 414 case DEVICE_SEND_RANDOM: 415 device_state = DEVICE_W4_DATA; 416 prov_waiting_for_outgoing_complete = 1; 417 provisioning_send_random(); 418 break; 419 case DEVICE_SEND_COMPLETE: 420 start_timer = 0; // last message 421 prov_waiting_for_outgoing_complete = 1; 422 provisioning_send_complete(); 423 provisioning_done(); 424 break; 425 default: 426 return; 427 } 428 if (start_timer){ 429 provisioning_timer_start(); 430 } 431 } 432 433 static void provisioning_handle_provisioning_error(uint8_t error_code){ 434 printf("PROVISIONING ERROR\n"); 435 provisioning_timer_stop(); 436 prov_error_code = error_code; 437 device_state = DEVICE_SEND_ERROR; 438 provisioning_run(); 439 } 440 441 static void provisioning_handle_invite(uint8_t *packet, uint16_t size){ 442 443 if (size != 1) return; 444 445 // store for confirmation inputs: len 1 446 memcpy(&prov_confirmation_inputs[0], packet, 1); 447 448 // handle invite message 449 prov_attention_timer_timeout = packet[0]; 450 provisioning_attention_timer_set(); 451 452 device_state = DEVICE_SEND_CAPABILITIES; 453 provisioning_run(); 454 } 455 456 static void provisioning_handle_start(uint8_t * packet, uint16_t size){ 457 458 if (size != 5) return; 459 460 // validate Algorithm 461 int ok = 1; 462 if (packet[0] > 0x00){ 463 ok = 0; 464 } 465 // validate Publik Key 466 if (packet[1] > 0x01){ 467 ok = 0; 468 } 469 // validate Authentication Method 470 switch (packet[2]){ 471 case 0: 472 case 1: 473 if (packet[3] != 0 || packet[4] != 0){ 474 ok = 0; 475 break; 476 } 477 break; 478 case 2: 479 if (packet[3] > 0x04 || packet[4] == 0 || packet[4] > 0x08){ 480 ok = 0; 481 break; 482 } 483 break; 484 case 3: 485 if (packet[3] > 0x03 || packet[4] == 0 || packet[4] > 0x08){ 486 ok = 0; 487 break; 488 } 489 break; 490 } 491 if (!ok){ 492 printf("PROV_START arguments incorrect\n"); 493 provisioning_handle_provisioning_error(0x02); 494 return; 495 } 496 497 // store for confirmation inputs: len 5 498 memcpy(&prov_confirmation_inputs[12], packet, 5); 499 500 // public key oob 501 prov_public_key_oob_used = packet[1]; 502 503 // authentication method 504 prov_authentication_method = packet[2]; 505 506 // start emit public OOK if specified 507 if (prov_public_key_oob_available && prov_public_key_oob_used){ 508 provisioning_emit_event(1, MESH_SUBEVENT_PB_PROV_START_EMIT_PUBLIC_KEY_OOB); 509 } 510 511 printf("PublicKey: %02x\n", prov_public_key_oob_used); 512 printf("AuthMethod: %02x\n", prov_authentication_method); 513 514 device_state = DEVICE_W4_PUB_KEY; 515 provisioning_run(); 516 } 517 518 static void provisioning_handle_public_key_dhkey(void * arg){ 519 UNUSED(arg); 520 521 printf("DHKEY: "); 522 printf_hexdump(dhkey, sizeof(dhkey)); 523 524 // skip sending own public key when public key oob is used 525 if (prov_public_key_oob_available && prov_public_key_oob_used){ 526 // just copy key for confirmation inputs 527 memcpy(&prov_confirmation_inputs[81], prov_ec_q, 64); 528 provisioning_public_key_exchange_complete(); 529 } else { 530 // queue public key pdu 531 printf("DEVICE_SEND_PUB_KEY\n"); 532 device_state = DEVICE_SEND_PUB_KEY; 533 } 534 provisioning_run(); 535 } 536 537 static void provisioning_handle_public_key(uint8_t *packet, uint16_t size){ 538 539 // validate public key 540 if (size != sizeof(remote_ec_q) || btstack_crypto_ecc_p256_validate_public_key(packet) != 0){ 541 printf("Public Key invalid, abort provisioning\n"); 542 provisioning_handle_provisioning_error(0x07); // Unexpected Error 543 return; 544 } 545 546 // stop emit public OOK if specified and send to crypto module 547 if (prov_public_key_oob_available && prov_public_key_oob_used){ 548 provisioning_emit_event(1, MESH_SUBEVENT_PB_PROV_STOP_EMIT_PUBLIC_KEY_OOB); 549 550 printf("Replace generated ECC with Public Key OOB:"); 551 memcpy(prov_ec_q, prov_public_key_oob_q, 64); 552 printf_hexdump(prov_ec_q, sizeof(prov_ec_q)); 553 btstack_crypto_ecc_p256_set_key(prov_public_key_oob_q, prov_public_key_oob_d); 554 } 555 556 // store for confirmation inputs: len 64 557 memcpy(&prov_confirmation_inputs[17], packet, 64); 558 559 // store remote q 560 memcpy(remote_ec_q, packet, sizeof(remote_ec_q)); 561 562 // calculate DHKey 563 btstack_crypto_ecc_p256_calculate_dhkey(&prov_ecc_p256_request, remote_ec_q, dhkey, provisioning_handle_public_key_dhkey, NULL); 564 } 565 566 static void provisioning_handle_confirmation_device_calculated(void * arg){ 567 568 UNUSED(arg); 569 570 printf("ConfirmationDevice: "); 571 printf_hexdump(confirmation_device, sizeof(confirmation_device)); 572 573 device_state = DEVICE_SEND_CONFIRM; 574 provisioning_run(); 575 } 576 577 static void provisioning_handle_confirmation_random_device(void * arg){ 578 // re-use prov_confirmation_inputs buffer 579 memcpy(&prov_confirmation_inputs[0], random_device, 16); 580 memcpy(&prov_confirmation_inputs[16], auth_value, 16); 581 582 // calc confirmation device 583 btstack_crypto_aes128_cmac_message(&prov_cmac_request, confirmation_key, 32, prov_confirmation_inputs, confirmation_device, &provisioning_handle_confirmation_device_calculated, NULL); 584 } 585 586 static void provisioning_handle_confirmation_k1_calculated(void * arg){ 587 printf("ConfirmationKey: "); 588 printf_hexdump(confirmation_key, sizeof(confirmation_key)); 589 590 printf("AuthValue: "); 591 printf_hexdump(auth_value, 16); 592 593 // generate random_device 594 btstack_crypto_random_generate(&prov_random_request,random_device, 16, &provisioning_handle_confirmation_random_device, NULL); 595 } 596 597 static void provisioning_handle_confirmation_s1_calculated(void * arg){ 598 UNUSED(arg); 599 600 // ConfirmationSalt 601 printf("ConfirmationSalt: "); 602 printf_hexdump(confirmation_salt, sizeof(confirmation_salt)); 603 604 // ConfirmationKey 605 mesh_k1(&prov_cmac_request, dhkey, sizeof(dhkey), confirmation_salt, (const uint8_t*) "prck", 4, confirmation_key, &provisioning_handle_confirmation_k1_calculated, NULL); 606 } 607 608 static void provisioning_handle_confirmation(uint8_t *packet, uint16_t size){ 609 610 UNUSED(size); 611 UNUSED(packet); 612 613 // 614 if (prov_emit_output_oob_active){ 615 prov_emit_output_oob_active = 0; 616 provisioning_emit_event(1, MESH_SUBEVENT_PB_PROV_STOP_EMIT_OUTPUT_OOB); 617 } 618 619 // CalculationInputs 620 printf("ConfirmationInputs: "); 621 printf_hexdump(prov_confirmation_inputs, sizeof(prov_confirmation_inputs)); 622 623 // calculate s1 624 btstack_crypto_aes128_cmac_zero(&prov_cmac_request, sizeof(prov_confirmation_inputs), prov_confirmation_inputs, confirmation_salt, &provisioning_handle_confirmation_s1_calculated, NULL); 625 } 626 627 // PROV_RANDOM 628 static void provisioning_handle_random_session_nonce_calculated(void * arg){ 629 UNUSED(arg); 630 631 // The nonce shall be the 13 least significant octets == zero most significant octets 632 uint8_t temp[13]; 633 memcpy(temp, &session_nonce[3], 13); 634 memcpy(session_nonce, temp, 13); 635 636 // SessionNonce 637 printf("SessionNonce: "); 638 printf_hexdump(session_nonce, 13); 639 640 device_state = DEVICE_SEND_RANDOM; 641 provisioning_run(); 642 } 643 644 static void provisioning_handle_random_session_key_calculated(void * arg){ 645 UNUSED(arg); 646 647 // SessionKey 648 printf("SessionKey: "); 649 printf_hexdump(session_key, sizeof(session_key)); 650 651 // SessionNonce 652 mesh_k1(&prov_cmac_request, dhkey, sizeof(dhkey), provisioning_salt, (const uint8_t*) "prsn", 4, session_nonce, &provisioning_handle_random_session_nonce_calculated, NULL); 653 } 654 655 static void provisioning_handle_random_s1_calculated(void * arg){ 656 657 UNUSED(arg); 658 659 // ProvisioningSalt 660 printf("ProvisioningSalt: "); 661 printf_hexdump(provisioning_salt, sizeof(provisioning_salt)); 662 663 // SessionKey 664 mesh_k1(&prov_cmac_request, dhkey, sizeof(dhkey), provisioning_salt, (const uint8_t*) "prsk", 4, session_key, &provisioning_handle_random_session_key_calculated, NULL); 665 } 666 667 static void provisioning_handle_random(uint8_t *packet, uint16_t size){ 668 669 UNUSED(size); 670 UNUSED(packet); 671 672 // TODO: validate Confirmation 673 674 // calc ProvisioningSalt = s1(ConfirmationSalt || RandomProvisioner || RandomDevice) 675 memcpy(&prov_confirmation_inputs[0], confirmation_salt, 16); 676 memcpy(&prov_confirmation_inputs[16], packet, 16); 677 memcpy(&prov_confirmation_inputs[32], random_device, 16); 678 btstack_crypto_aes128_cmac_zero(&prov_cmac_request, 48, prov_confirmation_inputs, provisioning_salt, &provisioning_handle_random_s1_calculated, NULL); 679 } 680 681 // PROV_DATA 682 static void provisioning_handle_network_dervived(void * arg){ 683 provisioning_timer_stop(); 684 685 // notify client 686 provisioning_emit_event(1, MESH_SUBEVENT_PB_PROV_COMPLETE); 687 688 device_state = DEVICE_SEND_COMPLETE; 689 provisioning_run(); 690 691 } 692 693 static void provisioning_handle_data_device_key(void * arg){ 694 // derive full network key 695 mesh_network_key_derive(&prov_cmac_request, network_key, &provisioning_handle_network_dervived, NULL); 696 } 697 698 static void provisioning_handle_data_ccm(void * arg){ 699 700 UNUSED(arg); 701 702 // TODO: validate MIC? 703 uint8_t mic[8]; 704 btstack_crypto_ccm_get_authentication_value(&prov_ccm_request, mic); 705 printf("MIC: "); 706 printf_hexdump(mic, 8); 707 708 // allocate network key 709 network_key = btstack_memory_mesh_network_key_get(); 710 711 // sort provisoning data 712 memcpy(network_key->net_key, provisioning_data, 16); 713 network_key->netkey_index = big_endian_read_16(provisioning_data, 16); 714 network_key->internal_index = 0; 715 flags = provisioning_data[18]; 716 iv_index = big_endian_read_32(provisioning_data, 19); 717 unicast_address = big_endian_read_16(provisioning_data, 23); 718 719 // DeviceKey 720 mesh_k1(&prov_cmac_request, dhkey, sizeof(dhkey), provisioning_salt, (const uint8_t*) "prdk", 4, device_key, &provisioning_handle_data_device_key, NULL); 721 } 722 723 static void provisioning_handle_data(uint8_t *packet, uint16_t size){ 724 725 UNUSED(size); 726 727 memcpy(enc_provisioning_data, packet, 25); 728 729 // decode response 730 btstack_crypto_ccm_init(&prov_ccm_request, session_key, session_nonce, 25, 0, 8); 731 btstack_crypto_ccm_decrypt_block(&prov_ccm_request, 25, enc_provisioning_data, provisioning_data, &provisioning_handle_data_ccm, NULL); 732 } 733 734 static void provisioning_handle_unexpected_pdu(uint8_t *packet, uint16_t size){ 735 printf("Unexpected PDU #%u in state #%u\n", packet[0], (int) device_state); 736 provisioning_handle_provisioning_error(0x03); 737 } 738 739 static void provisioning_handle_pdu(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 740 741 if (size < 1) return; 742 743 switch (packet_type){ 744 case HCI_EVENT_PACKET: 745 if (packet[0] != HCI_EVENT_MESH_META) break; 746 switch (packet[2]){ 747 case MESH_SUBEVENT_PB_TRANSPORT_LINK_OPEN: 748 pb_transport_cid = mesh_subevent_pb_transport_link_open_get_pb_transport_cid(packet); 749 pb_type = mesh_subevent_pb_transport_link_open_get_pb_type(packet); 750 printf("Link opened, reset state, transport cid 0x%02x, PB type %d\n", pb_transport_cid, pb_type); 751 provisioning_done(); 752 break; 753 case MESH_SUBEVENT_PB_TRANSPORT_PDU_SENT: 754 printf("Outgoing packet acked\n"); 755 prov_waiting_for_outgoing_complete = 0; 756 break; 757 case MESH_SUBEVENT_PB_TRANSPORT_LINK_CLOSED: 758 printf("Link close, reset state\n"); 759 pb_transport_cid = MESH_PB_TRANSPORT_INVALID_CID; 760 provisioning_done(); 761 break; 762 } 763 break; 764 case PROVISIONING_DATA_PACKET: 765 // check state 766 switch (device_state){ 767 case DEVICE_W4_INVITE: 768 if (packet[0] != MESH_PROV_INVITE) provisioning_handle_unexpected_pdu(packet, size); 769 printf("MESH_PROV_INVITE: "); 770 printf_hexdump(&packet[1], size-1); 771 provisioning_handle_invite(&packet[1], size-1); 772 break; 773 case DEVICE_W4_START: 774 if (packet[0] != MESH_PROV_START) provisioning_handle_unexpected_pdu(packet, size); 775 printf("MESH_PROV_START: "); 776 printf_hexdump(&packet[1], size-1); 777 provisioning_handle_start(&packet[1], size-1); 778 break; 779 case DEVICE_W4_PUB_KEY: 780 if (packet[0] != MESH_PROV_PUB_KEY) provisioning_handle_unexpected_pdu(packet, size); 781 printf("MESH_PROV_PUB_KEY: "); 782 printf_hexdump(&packet[1], size-1); 783 provisioning_handle_public_key(&packet[1], size-1); 784 break; 785 case DEVICE_W4_CONFIRM: 786 if (packet[0] != MESH_PROV_CONFIRM) provisioning_handle_unexpected_pdu(packet, size); 787 printf("MESH_PROV_CONFIRM: "); 788 printf_hexdump(&packet[1], size-1); 789 provisioning_handle_confirmation(&packet[1], size-1); 790 break; 791 case DEVICE_W4_RANDOM: 792 if (packet[0] != MESH_PROV_RANDOM) provisioning_handle_unexpected_pdu(packet, size); 793 printf("MESH_PROV_RANDOM: "); 794 printf_hexdump(&packet[1], size-1); 795 provisioning_handle_random(&packet[1], size-1); 796 break; 797 case DEVICE_W4_DATA: 798 if (packet[0] != MESH_PROV_DATA) provisioning_handle_unexpected_pdu(packet, size); 799 printf("MESH_PROV_DATA: "); 800 provisioning_handle_data(&packet[1], size-1); 801 break; 802 default: 803 break; 804 } 805 break; 806 default: 807 break; 808 } 809 provisioning_run(); 810 } 811 812 static void prov_key_generated(void * arg){ 813 UNUSED(arg); 814 printf("ECC-P256: "); 815 printf_hexdump(prov_ec_q, sizeof(prov_ec_q)); 816 // allow override 817 if (prov_public_key_oob_available){ 818 printf("Replace generated ECC with Public Key OOB:"); 819 memcpy(prov_ec_q, prov_public_key_oob_q, 64); 820 printf_hexdump(prov_ec_q, sizeof(prov_ec_q)); 821 btstack_crypto_ecc_p256_set_key(prov_public_key_oob_q, prov_public_key_oob_d); 822 } 823 } 824 825 void provisioning_device_init(void){ 826 // setup PB ADV 827 pb_adv_init(); 828 pb_adv_register_packet_handler(&provisioning_handle_pdu); 829 // setup PB GATT 830 pb_gatt_init(); 831 pb_gatt_register_packet_handler(&provisioning_handle_pdu); 832 833 pb_transport_cid = MESH_PB_TRANSPORT_INVALID_CID; 834 835 // init provisioning state 836 provisioning_done(); 837 838 // generate public key 839 btstack_crypto_ecc_p256_generate_key(&prov_ecc_p256_request, prov_ec_q, &prov_key_generated, NULL); 840 } 841 842 void provisioning_device_register_packet_handler(btstack_packet_handler_t packet_handler){ 843 prov_packet_handler = packet_handler; 844 } 845 846 void provisioning_device_set_public_key_oob(const uint8_t * public_key, const uint8_t * private_key){ 847 prov_public_key_oob_q = public_key; 848 prov_public_key_oob_d = private_key; 849 prov_public_key_oob_available = 1; 850 btstack_crypto_ecc_p256_set_key(prov_public_key_oob_q, prov_public_key_oob_d); 851 } 852 853 void provisioning_device_set_static_oob(uint16_t static_oob_len, const uint8_t * static_oob_data){ 854 prov_static_oob_available = 1; 855 prov_static_oob_data = static_oob_data; 856 prov_static_oob_len = btstack_min(static_oob_len, 16); 857 } 858 859 void provisioning_device_set_output_oob_actions(uint16_t supported_output_oob_action_types, uint8_t max_oob_output_size){ 860 prov_output_oob_actions = supported_output_oob_action_types; 861 prov_output_oob_size = max_oob_output_size; 862 } 863 864 void provisioning_device_set_input_oob_actions(uint16_t supported_input_oob_action_types, uint8_t max_oob_input_size){ 865 prov_input_oob_actions = supported_input_oob_action_types; 866 prov_input_oob_size = max_oob_input_size; 867 } 868 869 void provisioning_device_input_oob_complete_numeric(uint16_t pb_adv_cid, uint32_t input_oob){ 870 UNUSED(pb_adv_cid); 871 if (device_state != DEVICE_W4_INPUT_OOK) return; 872 873 // store input_oob as auth value 874 big_endian_store_32(auth_value, 12, input_oob); 875 device_state = DEVICE_SEND_INPUT_COMPLETE; 876 provisioning_run(); 877 } 878 879 void provisioning_device_input_oob_complete_alphanumeric(uint16_t pb_adv_cid, const uint8_t * input_oob_data, uint16_t input_oob_len){ 880 UNUSED(pb_adv_cid); 881 if (device_state != DEVICE_W4_INPUT_OOK) return; 882 883 // store input_oob and fillup with zeros 884 input_oob_len = btstack_min(input_oob_len, 16); 885 memset(auth_value, 0, 16); 886 memcpy(auth_value, input_oob_data, input_oob_len); 887 device_state = DEVICE_SEND_INPUT_COMPLETE; 888 provisioning_run(); 889 } 890 891 892 uint8_t provisioning_device_data_get_flags(void){ 893 return flags; 894 } 895 uint16_t provisioning_device_data_get_unicast_address(void){ 896 return unicast_address; 897 } 898 const uint8_t * provisioning_device_data_get_device_key(void){ 899 return device_key; 900 } 901 uint32_t provisioning_device_data_get_iv_index(void){ 902 return iv_index; 903 } 904 mesh_network_key_t * provisioning_device_data_get_network_key(void){ 905 return network_key; 906 } 907 908 void provisioning_device_data_get(mesh_provisioning_data_t * provisioning_data){ 909 provisioning_data->unicast_address = unicast_address; 910 provisioning_data->iv_index = iv_index; 911 provisioning_data->flags = flags; 912 memcpy(provisioning_data->device_key, device_key, 16); 913 provisioning_data->network_key = network_key; 914 } 915