1 // SPDX-License-Identifier: BSD-2-Clause 2 /* 3 * Copyright (c) 2017-2020, Linaro Limited 4 */ 5 6 #include <assert.h> 7 #include <pkcs11_ta.h> 8 #include <string.h> 9 #include <tee_api_defines.h> 10 #include <tee_internal_api.h> 11 #include <tee_internal_api_extensions.h> 12 #include <util.h> 13 14 #include "attributes.h" 15 #include "object.h" 16 #include "pkcs11_attributes.h" 17 #include "pkcs11_helpers.h" 18 #include "pkcs11_token.h" 19 #include "processing.h" 20 #include "serializer.h" 21 22 static enum pkcs11_rc get_ready_session(struct pkcs11_session *session) 23 { 24 if (session_is_active(session)) 25 return PKCS11_CKR_OPERATION_ACTIVE; 26 27 return PKCS11_CKR_OK; 28 } 29 30 static enum processing_func func_for_cmd(enum pkcs11_ta_cmd cmd) 31 { 32 switch (cmd) { 33 case PKCS11_CMD_ENCRYPT_UPDATE: 34 case PKCS11_CMD_ENCRYPT_ONESHOT: 35 case PKCS11_CMD_ENCRYPT_FINAL: 36 return PKCS11_FUNCTION_ENCRYPT; 37 case PKCS11_CMD_DECRYPT_UPDATE: 38 case PKCS11_CMD_DECRYPT_ONESHOT: 39 case PKCS11_CMD_DECRYPT_FINAL: 40 return PKCS11_FUNCTION_DECRYPT; 41 case PKCS11_CMD_SIGN_ONESHOT: 42 case PKCS11_CMD_SIGN_UPDATE: 43 case PKCS11_CMD_SIGN_FINAL: 44 return PKCS11_FUNCTION_SIGN; 45 case PKCS11_CMD_VERIFY_ONESHOT: 46 case PKCS11_CMD_VERIFY_UPDATE: 47 case PKCS11_CMD_VERIFY_FINAL: 48 return PKCS11_FUNCTION_VERIFY; 49 case PKCS11_CMD_DIGEST_UPDATE: 50 case PKCS11_CMD_DIGEST_KEY: 51 case PKCS11_CMD_DIGEST_ONESHOT: 52 case PKCS11_CMD_DIGEST_FINAL: 53 return PKCS11_FUNCTION_DIGEST; 54 default: 55 return PKCS11_FUNCTION_UNKNOWN; 56 } 57 } 58 59 static bool func_matches_state(enum processing_func function, 60 enum pkcs11_proc_state state) 61 { 62 switch (function) { 63 case PKCS11_FUNCTION_ENCRYPT: 64 return state == PKCS11_SESSION_ENCRYPTING || 65 state == PKCS11_SESSION_DIGESTING_ENCRYPTING || 66 state == PKCS11_SESSION_SIGNING_ENCRYPTING; 67 case PKCS11_FUNCTION_DECRYPT: 68 return state == PKCS11_SESSION_DECRYPTING || 69 state == PKCS11_SESSION_DECRYPTING_DIGESTING || 70 state == PKCS11_SESSION_DECRYPTING_VERIFYING; 71 case PKCS11_FUNCTION_DIGEST: 72 return state == PKCS11_SESSION_DIGESTING || 73 state == PKCS11_SESSION_DIGESTING_ENCRYPTING; 74 case PKCS11_FUNCTION_SIGN: 75 return state == PKCS11_SESSION_SIGNING || 76 state == PKCS11_SESSION_SIGNING_ENCRYPTING; 77 case PKCS11_FUNCTION_VERIFY: 78 return state == PKCS11_SESSION_VERIFYING || 79 state == PKCS11_SESSION_DECRYPTING_VERIFYING; 80 case PKCS11_FUNCTION_SIGN_RECOVER: 81 return state == PKCS11_SESSION_SIGNING_RECOVER; 82 case PKCS11_FUNCTION_VERIFY_RECOVER: 83 return state == PKCS11_SESSION_SIGNING_RECOVER; 84 default: 85 TEE_Panic(function); 86 return false; 87 } 88 } 89 90 static enum pkcs11_rc get_active_session(struct pkcs11_session *session, 91 enum processing_func function) 92 { 93 enum pkcs11_rc rc = PKCS11_CKR_OPERATION_NOT_INITIALIZED; 94 95 if (session->processing && 96 func_matches_state(function, session->processing->state)) 97 rc = PKCS11_CKR_OK; 98 99 return rc; 100 } 101 102 void release_active_processing(struct pkcs11_session *session) 103 { 104 if (!session->processing) 105 return; 106 107 if (session->processing->tee_op_handle != TEE_HANDLE_NULL) { 108 TEE_FreeOperation(session->processing->tee_op_handle); 109 session->processing->tee_op_handle = TEE_HANDLE_NULL; 110 } 111 112 TEE_Free(session->processing->extra_ctx); 113 114 TEE_Free(session->processing); 115 session->processing = NULL; 116 } 117 118 size_t get_object_key_bit_size(struct pkcs11_object *obj) 119 { 120 uint32_t a_size = 0; 121 struct obj_attrs *attrs = obj->attributes; 122 123 switch (get_key_type(attrs)) { 124 case PKCS11_CKK_AES: 125 case PKCS11_CKK_GENERIC_SECRET: 126 case PKCS11_CKK_MD5_HMAC: 127 case PKCS11_CKK_SHA_1_HMAC: 128 case PKCS11_CKK_SHA224_HMAC: 129 case PKCS11_CKK_SHA256_HMAC: 130 case PKCS11_CKK_SHA384_HMAC: 131 case PKCS11_CKK_SHA512_HMAC: 132 if (get_attribute_ptr(attrs, PKCS11_CKA_VALUE, NULL, &a_size)) 133 return 0; 134 135 return a_size * 8; 136 default: 137 TEE_Panic(0); 138 return 0; 139 } 140 } 141 142 static enum pkcs11_rc generate_random_key_value(struct obj_attrs **head) 143 { 144 enum pkcs11_rc rc = PKCS11_CKR_GENERAL_ERROR; 145 void *data = NULL; 146 uint32_t data_size = 0; 147 uint32_t value_len = 0; 148 void *value = NULL; 149 150 if (!*head) 151 return PKCS11_CKR_TEMPLATE_INCONSISTENT; 152 153 rc = get_attribute_ptr(*head, PKCS11_CKA_VALUE_LEN, &data, &data_size); 154 if (rc || data_size != sizeof(uint32_t)) { 155 DMSG("%s", rc ? "No attribute value_len found" : 156 "Invalid size for attribute VALUE_LEN"); 157 158 return PKCS11_CKR_ATTRIBUTE_VALUE_INVALID; 159 } 160 TEE_MemMove(&value_len, data, data_size); 161 162 /* Remove the default empty value attribute if found */ 163 rc = remove_empty_attribute(head, PKCS11_CKA_VALUE); 164 if (rc != PKCS11_CKR_OK && rc != PKCS11_RV_NOT_FOUND) 165 return PKCS11_CKR_GENERAL_ERROR; 166 167 value = TEE_Malloc(value_len, TEE_USER_MEM_HINT_NO_FILL_ZERO); 168 if (!value) 169 return PKCS11_CKR_DEVICE_MEMORY; 170 171 TEE_GenerateRandom(value, value_len); 172 173 rc = add_attribute(head, PKCS11_CKA_VALUE, value, value_len); 174 175 TEE_Free(value); 176 177 return rc; 178 } 179 180 enum pkcs11_rc entry_generate_secret(struct pkcs11_client *client, 181 uint32_t ptypes, TEE_Param *params) 182 { 183 const uint32_t exp_pt = TEE_PARAM_TYPES(TEE_PARAM_TYPE_MEMREF_INOUT, 184 TEE_PARAM_TYPE_NONE, 185 TEE_PARAM_TYPE_MEMREF_OUTPUT, 186 TEE_PARAM_TYPE_NONE); 187 TEE_Param *ctrl = params; 188 TEE_Param *out = params + 2; 189 enum pkcs11_rc rc = PKCS11_CKR_GENERAL_ERROR; 190 struct serialargs ctrlargs = { }; 191 struct pkcs11_session *session = NULL; 192 struct pkcs11_attribute_head *proc_params = NULL; 193 struct obj_attrs *head = NULL; 194 struct pkcs11_object_head *template = NULL; 195 size_t template_size = 0; 196 uint32_t obj_handle = 0; 197 198 if (!client || ptypes != exp_pt || 199 out->memref.size != sizeof(obj_handle)) 200 return PKCS11_CKR_ARGUMENTS_BAD; 201 202 serialargs_init(&ctrlargs, ctrl->memref.buffer, ctrl->memref.size); 203 204 rc = serialargs_get_session_from_handle(&ctrlargs, client, &session); 205 if (rc) 206 return rc; 207 208 rc = serialargs_alloc_get_one_attribute(&ctrlargs, &proc_params); 209 if (rc) 210 goto out; 211 212 rc = serialargs_alloc_get_attributes(&ctrlargs, &template); 213 if (rc) 214 goto out; 215 216 if (serialargs_remaining_bytes(&ctrlargs)) { 217 rc = PKCS11_CKR_ARGUMENTS_BAD; 218 goto out; 219 } 220 221 rc = get_ready_session(session); 222 if (rc) 223 goto out; 224 225 template_size = sizeof(*template) + template->attrs_size; 226 227 rc = check_mechanism_against_processing(session, proc_params->id, 228 PKCS11_FUNCTION_GENERATE, 229 PKCS11_FUNC_STEP_INIT); 230 if (rc) { 231 DMSG("Invalid mechanism %#"PRIx32": %#x", proc_params->id, rc); 232 goto out; 233 } 234 235 /* 236 * Prepare a clean initial state for the requested object attributes. 237 * Free temporary template once done. 238 */ 239 rc = create_attributes_from_template(&head, template, template_size, 240 NULL, PKCS11_FUNCTION_GENERATE, 241 proc_params->id, 242 PKCS11_CKO_UNDEFINED_ID); 243 if (rc) 244 goto out; 245 246 TEE_Free(template); 247 template = NULL; 248 249 rc = check_created_attrs(head, NULL); 250 if (rc) 251 goto out; 252 253 rc = check_created_attrs_against_processing(proc_params->id, head); 254 if (rc) 255 goto out; 256 257 rc = check_created_attrs_against_token(session, head); 258 if (rc) 259 goto out; 260 261 /* 262 * Execute target processing and add value as attribute 263 * PKCS11_CKA_VALUE. Symm key generation: depends on target 264 * processing to be used. 265 */ 266 switch (proc_params->id) { 267 case PKCS11_CKM_GENERIC_SECRET_KEY_GEN: 268 case PKCS11_CKM_AES_KEY_GEN: 269 /* Generate random of size specified by attribute VALUE_LEN */ 270 rc = generate_random_key_value(&head); 271 if (rc) 272 goto out; 273 break; 274 275 default: 276 rc = PKCS11_CKR_MECHANISM_INVALID; 277 goto out; 278 } 279 280 TEE_Free(proc_params); 281 proc_params = NULL; 282 283 /* 284 * Object is ready, register it and return a handle. 285 */ 286 rc = create_object(session, head, &obj_handle); 287 if (rc) 288 goto out; 289 290 /* 291 * Now obj_handle (through the related struct pkcs11_object instance) 292 * owns the serialized buffer that holds the object attributes. 293 * We reset head to NULL as it is no more the buffer owner and would 294 * be freed at function out. 295 */ 296 head = NULL; 297 298 TEE_MemMove(out->memref.buffer, &obj_handle, sizeof(obj_handle)); 299 out->memref.size = sizeof(obj_handle); 300 301 DMSG("PKCS11 session %"PRIu32": generate secret %#"PRIx32, 302 session->handle, obj_handle); 303 304 out: 305 TEE_Free(proc_params); 306 TEE_Free(template); 307 TEE_Free(head); 308 309 return rc; 310 } 311 312 enum pkcs11_rc alloc_get_tee_attribute_data(TEE_ObjectHandle tee_obj, 313 uint32_t attribute, 314 void **data, size_t *size) 315 { 316 TEE_Result res = TEE_ERROR_GENERIC; 317 void *ptr = NULL; 318 uint32_t sz = 0; 319 320 res = TEE_GetObjectBufferAttribute(tee_obj, attribute, NULL, &sz); 321 if (res != TEE_ERROR_SHORT_BUFFER) 322 return PKCS11_CKR_FUNCTION_FAILED; 323 324 ptr = TEE_Malloc(sz, TEE_USER_MEM_HINT_NO_FILL_ZERO); 325 if (!ptr) 326 return PKCS11_CKR_DEVICE_MEMORY; 327 328 res = TEE_GetObjectBufferAttribute(tee_obj, attribute, ptr, &sz); 329 if (res) { 330 TEE_Free(ptr); 331 } else { 332 *data = ptr; 333 *size = sz; 334 } 335 336 return tee2pkcs_error(res); 337 } 338 339 enum pkcs11_rc tee2pkcs_add_attribute(struct obj_attrs **head, 340 uint32_t pkcs11_id, 341 TEE_ObjectHandle tee_obj, 342 uint32_t tee_id) 343 { 344 enum pkcs11_rc rc = PKCS11_CKR_GENERAL_ERROR; 345 void *a_ptr = NULL; 346 size_t a_size = 0; 347 348 rc = alloc_get_tee_attribute_data(tee_obj, tee_id, &a_ptr, &a_size); 349 if (rc) 350 goto out; 351 352 rc = add_attribute(head, pkcs11_id, a_ptr, a_size); 353 354 TEE_Free(a_ptr); 355 356 out: 357 if (rc) 358 EMSG("Failed TEE attribute %#"PRIx32" for %#"PRIx32"/%s", 359 tee_id, pkcs11_id, id2str_attr(pkcs11_id)); 360 return rc; 361 } 362 363 enum pkcs11_rc entry_generate_key_pair(struct pkcs11_client *client, 364 uint32_t ptypes, TEE_Param *params) 365 { 366 const uint32_t exp_pt = TEE_PARAM_TYPES(TEE_PARAM_TYPE_MEMREF_INOUT, 367 TEE_PARAM_TYPE_NONE, 368 TEE_PARAM_TYPE_MEMREF_OUTPUT, 369 TEE_PARAM_TYPE_NONE); 370 TEE_Param *ctrl = params; 371 TEE_Param *out = params + 2; 372 enum pkcs11_rc rc = PKCS11_CKR_GENERAL_ERROR; 373 struct serialargs ctrlargs = { }; 374 struct pkcs11_session *session = NULL; 375 struct pkcs11_attribute_head *proc_params = NULL; 376 struct obj_attrs *pub_head = NULL; 377 struct obj_attrs *priv_head = NULL; 378 struct pkcs11_object_head *pub_template = NULL; 379 struct pkcs11_object_head *priv_template = NULL; 380 struct pkcs11_object *object = NULL; 381 size_t pub_template_size = 0; 382 size_t priv_template_size = 0; 383 uint32_t pubkey_handle = 0; 384 uint32_t privkey_handle = 0; 385 uint32_t *hdl_ptr = NULL; 386 size_t out_ref_size = sizeof(pubkey_handle) + sizeof(privkey_handle); 387 388 if (!client || ptypes != exp_pt || out->memref.size != out_ref_size) 389 return PKCS11_CKR_ARGUMENTS_BAD; 390 391 serialargs_init(&ctrlargs, ctrl->memref.buffer, ctrl->memref.size); 392 393 rc = serialargs_get_session_from_handle(&ctrlargs, client, &session); 394 if (rc) 395 return rc; 396 397 rc = serialargs_alloc_get_one_attribute(&ctrlargs, &proc_params); 398 if (rc) 399 goto out; 400 401 rc = serialargs_alloc_get_attributes(&ctrlargs, &pub_template); 402 if (rc) 403 goto out; 404 405 rc = serialargs_alloc_get_attributes(&ctrlargs, &priv_template); 406 if (rc) 407 goto out; 408 409 if (serialargs_remaining_bytes(&ctrlargs)) { 410 rc = PKCS11_CKR_ARGUMENTS_BAD; 411 goto out; 412 } 413 414 rc = get_ready_session(session); 415 if (rc) 416 goto out; 417 418 rc = check_mechanism_against_processing(session, proc_params->id, 419 PKCS11_FUNCTION_GENERATE_PAIR, 420 PKCS11_FUNC_STEP_INIT); 421 if (rc) 422 goto out; 423 424 pub_template_size = sizeof(*pub_template) + pub_template->attrs_size; 425 426 rc = create_attributes_from_template(&pub_head, pub_template, 427 pub_template_size, NULL, 428 PKCS11_FUNCTION_GENERATE_PAIR, 429 proc_params->id, 430 PKCS11_CKO_PUBLIC_KEY); 431 if (rc) 432 goto out; 433 434 TEE_Free(pub_template); 435 pub_template = NULL; 436 437 priv_template_size = sizeof(*priv_template) + 438 priv_template->attrs_size; 439 440 rc = create_attributes_from_template(&priv_head, priv_template, 441 priv_template_size, NULL, 442 PKCS11_FUNCTION_GENERATE_PAIR, 443 proc_params->id, 444 PKCS11_CKO_PRIVATE_KEY); 445 if (rc) 446 goto out; 447 448 TEE_Free(priv_template); 449 priv_template = NULL; 450 451 /* Generate CKA_ID for keys if not specified by the templates */ 452 rc = add_missing_attribute_id(&pub_head, &priv_head); 453 if (rc) 454 goto out; 455 456 /* Check created object against processing and token state */ 457 rc = check_created_attrs(pub_head, priv_head); 458 if (rc) 459 goto out; 460 461 rc = check_created_attrs_against_processing(proc_params->id, pub_head); 462 if (rc) 463 goto out; 464 465 rc = check_created_attrs_against_processing(proc_params->id, 466 priv_head); 467 if (rc) 468 goto out; 469 470 rc = check_created_attrs_against_token(session, pub_head); 471 if (rc) 472 goto out; 473 474 rc = check_access_attrs_against_token(session, pub_head); 475 if (rc) 476 goto out; 477 478 rc = check_created_attrs_against_token(session, priv_head); 479 if (rc) 480 goto out; 481 482 rc = check_access_attrs_against_token(session, priv_head); 483 if (rc) 484 goto out; 485 486 /* Generate key pair */ 487 switch (proc_params->id) { 488 default: 489 rc = PKCS11_CKR_MECHANISM_INVALID; 490 break; 491 } 492 if (rc) 493 goto out; 494 495 TEE_Free(proc_params); 496 proc_params = NULL; 497 498 /* 499 * Object is ready, register it and return a handle. 500 */ 501 rc = create_object(session, pub_head, &pubkey_handle); 502 if (rc) 503 goto out; 504 505 /* 506 * Now obj_handle (through the related struct pkcs11_object instance) 507 * owns the serialized buffer that holds the object attributes. 508 * We reset local pub_head to NULL to mark that ownership has been 509 * transferred. 510 */ 511 pub_head = NULL; 512 513 rc = create_object(session, priv_head, &privkey_handle); 514 if (rc) 515 goto out; 516 517 /* Ownership has been transferred so mark it with NULL */ 518 priv_head = NULL; 519 520 hdl_ptr = (uint32_t *)out->memref.buffer; 521 522 TEE_MemMove(hdl_ptr, &pubkey_handle, sizeof(pubkey_handle)); 523 TEE_MemMove(hdl_ptr + 1, &privkey_handle, sizeof(privkey_handle)); 524 525 pubkey_handle = 0; 526 privkey_handle = 0; 527 528 DMSG("PKCS11 session %"PRIu32": create key pair %#"PRIx32"/%#"PRIx32, 529 session->handle, privkey_handle, pubkey_handle); 530 531 out: 532 if (pubkey_handle) { 533 object = pkcs11_handle2object(pubkey_handle, session); 534 if (!object) 535 TEE_Panic(0); 536 destroy_object(session, object, false); 537 } 538 TEE_Free(priv_head); 539 TEE_Free(pub_head); 540 TEE_Free(priv_template); 541 TEE_Free(pub_template); 542 TEE_Free(proc_params); 543 544 return rc; 545 } 546 547 /* 548 * entry_processing_init - Generic entry for initializing a processing 549 * 550 * @client = client reference 551 * @ptype = Invocation parameter types 552 * @params = Invocation parameters reference 553 * @function - encrypt, decrypt, sign, verify, digest, ... 554 */ 555 enum pkcs11_rc entry_processing_init(struct pkcs11_client *client, 556 uint32_t ptypes, TEE_Param *params, 557 enum processing_func function) 558 { 559 const uint32_t exp_pt = TEE_PARAM_TYPES(TEE_PARAM_TYPE_MEMREF_INOUT, 560 TEE_PARAM_TYPE_NONE, 561 TEE_PARAM_TYPE_NONE, 562 TEE_PARAM_TYPE_NONE); 563 TEE_Param *ctrl = params; 564 enum pkcs11_rc rc = PKCS11_CKR_OK; 565 struct serialargs ctrlargs = { }; 566 struct pkcs11_session *session = NULL; 567 struct pkcs11_attribute_head *proc_params = NULL; 568 uint32_t key_handle = 0; 569 struct pkcs11_object *obj = NULL; 570 571 if (!client || ptypes != exp_pt) 572 return PKCS11_CKR_ARGUMENTS_BAD; 573 574 serialargs_init(&ctrlargs, ctrl->memref.buffer, ctrl->memref.size); 575 576 rc = serialargs_get_session_from_handle(&ctrlargs, client, &session); 577 if (rc) 578 return rc; 579 580 if (function != PKCS11_FUNCTION_DIGEST) { 581 rc = serialargs_get(&ctrlargs, &key_handle, sizeof(uint32_t)); 582 if (rc) 583 return rc; 584 } 585 586 rc = serialargs_alloc_get_one_attribute(&ctrlargs, &proc_params); 587 if (rc) 588 return rc; 589 590 if (serialargs_remaining_bytes(&ctrlargs)) { 591 rc = PKCS11_CKR_ARGUMENTS_BAD; 592 goto out; 593 } 594 595 rc = get_ready_session(session); 596 if (rc) 597 goto out; 598 599 if (function != PKCS11_FUNCTION_DIGEST) { 600 obj = pkcs11_handle2object(key_handle, session); 601 if (!obj) { 602 rc = PKCS11_CKR_KEY_HANDLE_INVALID; 603 goto out; 604 } 605 } 606 607 rc = set_processing_state(session, function, obj, NULL); 608 if (rc) 609 goto out; 610 611 rc = check_mechanism_against_processing(session, proc_params->id, 612 function, 613 PKCS11_FUNC_STEP_INIT); 614 if (rc) 615 goto out; 616 617 if (obj) { 618 rc = check_parent_attrs_against_processing(proc_params->id, 619 function, 620 obj->attributes); 621 if (rc) 622 goto out; 623 624 rc = check_access_attrs_against_token(session, 625 obj->attributes); 626 if (rc) 627 goto out; 628 } 629 630 if (processing_is_tee_symm(proc_params->id)) 631 rc = init_symm_operation(session, function, proc_params, obj); 632 else if (processing_is_tee_digest(proc_params->id)) 633 rc = init_digest_operation(session, proc_params); 634 else 635 rc = PKCS11_CKR_MECHANISM_INVALID; 636 637 if (rc == PKCS11_CKR_OK) { 638 session->processing->mecha_type = proc_params->id; 639 DMSG("PKCS11 session %"PRIu32": init processing %s %s", 640 session->handle, id2str_proc(proc_params->id), 641 id2str_function(function)); 642 } 643 644 out: 645 if (rc && session) 646 release_active_processing(session); 647 648 TEE_Free(proc_params); 649 650 return rc; 651 } 652 653 /* 654 * entry_processing_step - Generic entry on active processing 655 * 656 * @client = client reference 657 * @ptype = Invocation parameter types 658 * @params = Invocation parameters reference 659 * @function - encrypt, decrypt, sign, verify, digest, ... 660 * @step - update, oneshot, final 661 */ 662 enum pkcs11_rc entry_processing_step(struct pkcs11_client *client, 663 uint32_t ptypes, TEE_Param *params, 664 enum processing_func function, 665 enum processing_step step) 666 { 667 TEE_Param *ctrl = params; 668 enum pkcs11_rc rc = PKCS11_CKR_OK; 669 struct serialargs ctrlargs = { }; 670 struct pkcs11_session *session = NULL; 671 enum pkcs11_mechanism_id mecha_type = PKCS11_CKM_UNDEFINED_ID; 672 uint32_t key_handle = 0; 673 struct pkcs11_object *obj = NULL; 674 675 if (!client || 676 TEE_PARAM_TYPE_GET(ptypes, 0) != TEE_PARAM_TYPE_MEMREF_INOUT) 677 return PKCS11_CKR_ARGUMENTS_BAD; 678 679 serialargs_init(&ctrlargs, ctrl->memref.buffer, ctrl->memref.size); 680 681 rc = serialargs_get_session_from_handle(&ctrlargs, client, &session); 682 if (rc) 683 return rc; 684 685 if (step == PKCS11_FUNC_STEP_UPDATE_KEY) { 686 assert(function == PKCS11_FUNCTION_DIGEST); 687 688 rc = serialargs_get(&ctrlargs, &key_handle, sizeof(uint32_t)); 689 if (rc) 690 return rc; 691 } 692 693 if (serialargs_remaining_bytes(&ctrlargs)) 694 return PKCS11_CKR_ARGUMENTS_BAD; 695 696 rc = get_active_session(session, function); 697 if (rc) 698 return rc; 699 700 if (step == PKCS11_FUNC_STEP_UPDATE_KEY) { 701 assert(function == PKCS11_FUNCTION_DIGEST); 702 703 obj = pkcs11_handle2object(key_handle, session); 704 if (!obj) { 705 rc = PKCS11_CKR_KEY_HANDLE_INVALID; 706 goto out; 707 } 708 709 rc = check_access_attrs_against_token(session, 710 obj->attributes); 711 if (rc) { 712 rc = PKCS11_CKR_KEY_HANDLE_INVALID; 713 goto out; 714 } 715 } 716 717 mecha_type = session->processing->mecha_type; 718 rc = check_mechanism_against_processing(session, mecha_type, 719 function, step); 720 if (rc) 721 goto out; 722 723 if (processing_is_tee_symm(mecha_type)) 724 rc = step_symm_operation(session, function, step, 725 ptypes, params); 726 else if (processing_is_tee_digest(mecha_type)) 727 rc = step_digest_operation(session, step, obj, ptypes, params); 728 else 729 rc = PKCS11_CKR_MECHANISM_INVALID; 730 731 if (rc == PKCS11_CKR_OK && (step == PKCS11_FUNC_STEP_UPDATE || 732 step == PKCS11_FUNC_STEP_UPDATE_KEY)) { 733 session->processing->updated = true; 734 DMSG("PKCS11 session%"PRIu32": processing %s %s", 735 session->handle, id2str_proc(mecha_type), 736 id2str_function(function)); 737 } 738 739 out: 740 switch (step) { 741 case PKCS11_FUNC_STEP_UPDATE: 742 case PKCS11_FUNC_STEP_UPDATE_KEY: 743 if (rc != PKCS11_CKR_OK && rc != PKCS11_CKR_BUFFER_TOO_SMALL) 744 release_active_processing(session); 745 break; 746 default: 747 /* ONESHOT and FINAL terminates processing on success */ 748 if (rc != PKCS11_CKR_BUFFER_TOO_SMALL) 749 release_active_processing(session); 750 break; 751 } 752 753 return rc; 754 } 755 756 enum pkcs11_rc entry_processing_key(struct pkcs11_client *client, 757 uint32_t ptypes, TEE_Param *params, 758 enum processing_func function) 759 { 760 const uint32_t exp_pt = TEE_PARAM_TYPES(TEE_PARAM_TYPE_MEMREF_INOUT, 761 TEE_PARAM_TYPE_NONE, 762 TEE_PARAM_TYPE_MEMREF_OUTPUT, 763 TEE_PARAM_TYPE_NONE); 764 TEE_Param *ctrl = params; 765 TEE_Param *out = params + 2; 766 enum pkcs11_rc rc = PKCS11_CKR_GENERAL_ERROR; 767 struct serialargs ctrlargs = { }; 768 struct pkcs11_session *session = NULL; 769 struct pkcs11_attribute_head *proc_params = NULL; 770 struct pkcs11_object_head *template = NULL; 771 uint32_t parent_handle = 0; 772 uint32_t obj_handle = 0; 773 struct pkcs11_object *parent = NULL; 774 struct obj_attrs *head = NULL; 775 size_t template_size = 0; 776 void *out_buf = NULL; 777 uint32_t out_size = 0; 778 779 if (!client || ptypes != exp_pt || 780 out->memref.size != sizeof(obj_handle)) 781 return PKCS11_CKR_ARGUMENTS_BAD; 782 783 serialargs_init(&ctrlargs, ctrl->memref.buffer, ctrl->memref.size); 784 785 rc = serialargs_get_session_from_handle(&ctrlargs, client, &session); 786 if (rc) 787 return rc; 788 789 rc = serialargs_get(&ctrlargs, &parent_handle, sizeof(uint32_t)); 790 if (rc) 791 return rc; 792 793 rc = serialargs_alloc_get_one_attribute(&ctrlargs, &proc_params); 794 if (rc) 795 goto out_free; 796 797 rc = serialargs_alloc_get_attributes(&ctrlargs, &template); 798 if (rc) 799 goto out_free; 800 801 if (serialargs_remaining_bytes(&ctrlargs)) { 802 rc = PKCS11_CKR_ARGUMENTS_BAD; 803 goto out_free; 804 } 805 806 /* Return error if processing already active */ 807 rc = get_ready_session(session); 808 if (rc) 809 goto out_free; 810 811 /* Check parent handle */ 812 parent = pkcs11_handle2object(parent_handle, session); 813 if (!parent) { 814 rc = PKCS11_CKR_KEY_HANDLE_INVALID; 815 goto out_free; 816 } 817 818 /* Check if mechanism can be used for derivation function */ 819 rc = check_mechanism_against_processing(session, proc_params->id, 820 function, 821 PKCS11_FUNC_STEP_INIT); 822 if (rc) 823 goto out_free; 824 825 /* Set the processing state to active */ 826 rc = set_processing_state(session, function, parent, NULL); 827 if (rc) 828 goto out_free; 829 830 /* 831 * Check if base/parent key has CKA_DERIVE set and its key type is 832 * compatible with the mechanism passed 833 */ 834 rc = check_parent_attrs_against_processing(proc_params->id, function, 835 parent->attributes); 836 if (rc) { 837 /* 838 * CKR_KEY_FUNCTION_NOT_PERMITTED is not in the list of errors 839 * specified with C_Derive/Unwrap() in the specification. So 840 * return the next most appropriate error. 841 */ 842 if (rc == PKCS11_CKR_KEY_FUNCTION_NOT_PERMITTED) 843 rc = PKCS11_CKR_KEY_TYPE_INCONSISTENT; 844 goto out; 845 } 846 847 /* Check access of base/parent key */ 848 rc = check_access_attrs_against_token(session, parent->attributes); 849 if (rc) 850 goto out; 851 852 template_size = sizeof(*template) + template->attrs_size; 853 /* 854 * Prepare a clean initial state for the requested object attributes 855 * using base/parent key attributes. Free temporary template once done. 856 */ 857 rc = create_attributes_from_template(&head, template, template_size, 858 parent->attributes, 859 function, 860 proc_params->id, 861 PKCS11_CKO_UNDEFINED_ID); 862 if (rc) 863 goto out; 864 865 TEE_Free(template); 866 template = NULL; 867 868 /* check_created_attrs() is called later once key size is known */ 869 870 rc = check_created_attrs_against_processing(proc_params->id, head); 871 if (rc) 872 goto out; 873 874 rc = check_created_attrs_against_token(session, head); 875 if (rc) 876 goto out; 877 878 if (processing_is_tee_symm(proc_params->id)) { 879 /* 880 * These derivation mechanism require encryption to be 881 * performed on the data passed in proc_params by parent 882 * key. Hence pass function as PKCS11_FUNCTION_ENCRYPT 883 * to init_symm_operation() 884 */ 885 rc = init_symm_operation(session, PKCS11_FUNCTION_ENCRYPT, 886 proc_params, parent); 887 if (rc) 888 goto out; 889 890 session->processing->mecha_type = proc_params->id; 891 892 rc = derive_key_by_symm_enc(session, &out_buf, &out_size); 893 if (rc) 894 goto out; 895 } else { 896 rc = PKCS11_CKR_MECHANISM_INVALID; 897 goto out; 898 } 899 900 rc = set_key_data(&head, out_buf, out_size); 901 if (rc) 902 goto out; 903 904 TEE_Free(out_buf); 905 out_buf = NULL; 906 907 TEE_Free(proc_params); 908 proc_params = NULL; 909 910 /* 911 * Object is ready, register it and return a handle. 912 */ 913 rc = create_object(session, head, &obj_handle); 914 if (rc) 915 goto out; 916 917 /* 918 * Now obj_handle (through the related struct pkcs11_object instance) 919 * owns the serialized buffer that holds the object attributes. 920 * We reset head to NULL as it is no more the buffer owner and would 921 * be freed at function out. 922 */ 923 head = NULL; 924 925 TEE_MemMove(out->memref.buffer, &obj_handle, sizeof(obj_handle)); 926 out->memref.size = sizeof(obj_handle); 927 928 DMSG("PKCS11 session %"PRIu32": derive secret %#"PRIx32, 929 session->handle, obj_handle); 930 931 out: 932 release_active_processing(session); 933 out_free: 934 TEE_Free(proc_params); 935 TEE_Free(template); 936 TEE_Free(head); 937 TEE_Free(out_buf); 938 939 return rc; 940 } 941 942 enum pkcs11_rc entry_release_active_processing(struct pkcs11_client *client, 943 uint32_t ptypes, 944 TEE_Param *params) 945 { 946 const uint32_t exp_pt = TEE_PARAM_TYPES(TEE_PARAM_TYPE_MEMREF_INOUT, 947 TEE_PARAM_TYPE_NONE, 948 TEE_PARAM_TYPE_NONE, 949 TEE_PARAM_TYPE_NONE); 950 TEE_Param *ctrl = params; 951 enum pkcs11_rc rc = PKCS11_CKR_OK; 952 struct serialargs ctrlargs = { }; 953 struct pkcs11_session *session = NULL; 954 enum processing_func function = PKCS11_FUNCTION_UNKNOWN; 955 uint32_t cmd = 0; 956 957 if (!client || ptypes != exp_pt) 958 return PKCS11_CKR_ARGUMENTS_BAD; 959 960 serialargs_init(&ctrlargs, ctrl->memref.buffer, ctrl->memref.size); 961 962 rc = serialargs_get_session_from_handle(&ctrlargs, client, &session); 963 if (rc) 964 return rc; 965 966 rc = serialargs_get_u32(&ctrlargs, &cmd); 967 968 if (serialargs_remaining_bytes(&ctrlargs)) 969 return PKCS11_CKR_ARGUMENTS_BAD; 970 971 function = func_for_cmd(cmd); 972 if (function == PKCS11_FUNCTION_UNKNOWN) 973 return PKCS11_CKR_ARGUMENTS_BAD; 974 975 rc = get_active_session(session, function); 976 if (rc) 977 return rc; 978 979 release_active_processing(session); 980 981 DMSG("PKCS11 session %"PRIu32": release processing", session->handle); 982 983 return PKCS11_CKR_OK; 984 } 985