1 /* 2 * Copyright 2019-2024 The OpenSSL Project Authors. All Rights Reserved. 3 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. 4 * 5 * Licensed under the Apache License 2.0 (the "License"). You may not use 6 * this file except in compliance with the License. You can obtain a copy 7 * in the file LICENSE in the source distribution or at 8 * https://www.openssl.org/source/license.html 9 */ 10 11 #include <string.h> 12 #include <stdio.h> 13 #include <stdarg.h> 14 #include <openssl/crypto.h> 15 #include "internal/core.h" 16 #include "internal/property.h" 17 #include "internal/provider.h" 18 #include "internal/tsan_assist.h" 19 #include "crypto/ctype.h" 20 #include <openssl/lhash.h> 21 #include <openssl/rand.h> 22 #include "internal/thread_once.h" 23 #include "crypto/lhash.h" 24 #include "crypto/sparse_array.h" 25 #include "property_local.h" 26 27 /* 28 * The number of elements in the query cache before we initiate a flush. 29 * If reducing this, also ensure the stochastic test in test/property_test.c 30 * isn't likely to fail. 31 */ 32 #define IMPL_CACHE_FLUSH_THRESHOLD 500 33 34 typedef struct { 35 void *method; 36 int (*up_ref)(void *); 37 void (*free)(void *); 38 } METHOD; 39 40 typedef struct { 41 const OSSL_PROVIDER *provider; 42 OSSL_PROPERTY_LIST *properties; 43 METHOD method; 44 } IMPLEMENTATION; 45 46 DEFINE_STACK_OF(IMPLEMENTATION) 47 48 typedef struct { 49 const OSSL_PROVIDER *provider; 50 const char *query; 51 METHOD method; 52 char body[1]; 53 } QUERY; 54 55 DEFINE_LHASH_OF(QUERY); 56 57 typedef struct { 58 int nid; 59 STACK_OF(IMPLEMENTATION) *impls; 60 LHASH_OF(QUERY) *cache; 61 } ALGORITHM; 62 63 struct ossl_method_store_st { 64 OSSL_LIB_CTX *ctx; 65 SPARSE_ARRAY_OF(ALGORITHM) *algs; 66 /* 67 * Lock to protect the |algs| array from concurrent writing, when 68 * individual implementations or queries are inserted. This is used 69 * by the appropriate functions here. 70 */ 71 CRYPTO_RWLOCK *lock; 72 /* 73 * Lock to reserve the whole store. This is used when fetching a set 74 * of algorithms, via these functions, found in crypto/core_fetch.c: 75 * ossl_method_construct_reserve_store() 76 * ossl_method_construct_unreserve_store() 77 */ 78 CRYPTO_RWLOCK *biglock; 79 80 /* query cache specific values */ 81 82 /* Count of the query cache entries for all algs */ 83 size_t cache_nelem; 84 85 /* Flag: 1 if query cache entries for all algs need flushing */ 86 int cache_need_flush; 87 }; 88 89 typedef struct { 90 LHASH_OF(QUERY) *cache; 91 size_t nelem; 92 uint32_t seed; 93 unsigned char using_global_seed; 94 } IMPL_CACHE_FLUSH; 95 96 DEFINE_SPARSE_ARRAY_OF(ALGORITHM); 97 98 DEFINE_STACK_OF(ALGORITHM) 99 100 typedef struct ossl_global_properties_st { 101 OSSL_PROPERTY_LIST *list; 102 #ifndef FIPS_MODULE 103 unsigned int no_mirrored : 1; 104 #endif 105 } OSSL_GLOBAL_PROPERTIES; 106 107 static void ossl_method_cache_flush_alg(OSSL_METHOD_STORE *store, 108 ALGORITHM *alg); 109 static void ossl_method_cache_flush(OSSL_METHOD_STORE *store, int nid); 110 111 /* Global properties are stored per library context */ 112 static void ossl_ctx_global_properties_free(void *vglobp) 113 { 114 OSSL_GLOBAL_PROPERTIES *globp = vglobp; 115 116 if (globp != NULL) { 117 ossl_property_free(globp->list); 118 OPENSSL_free(globp); 119 } 120 } 121 122 static void *ossl_ctx_global_properties_new(OSSL_LIB_CTX *ctx) 123 { 124 return OPENSSL_zalloc(sizeof(OSSL_GLOBAL_PROPERTIES)); 125 } 126 127 static const OSSL_LIB_CTX_METHOD ossl_ctx_global_properties_method = { 128 OSSL_LIB_CTX_METHOD_DEFAULT_PRIORITY, 129 ossl_ctx_global_properties_new, 130 ossl_ctx_global_properties_free, 131 }; 132 133 OSSL_PROPERTY_LIST **ossl_ctx_global_properties(OSSL_LIB_CTX *libctx, 134 ossl_unused int loadconfig) 135 { 136 OSSL_GLOBAL_PROPERTIES *globp; 137 138 #if !defined(FIPS_MODULE) && !defined(OPENSSL_NO_AUTOLOAD_CONFIG) 139 if (loadconfig && !OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CONFIG, NULL)) 140 return NULL; 141 #endif 142 globp = ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_GLOBAL_PROPERTIES, 143 &ossl_ctx_global_properties_method); 144 145 return globp != NULL ? &globp->list : NULL; 146 } 147 148 #ifndef FIPS_MODULE 149 int ossl_global_properties_no_mirrored(OSSL_LIB_CTX *libctx) 150 { 151 OSSL_GLOBAL_PROPERTIES *globp 152 = ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_GLOBAL_PROPERTIES, 153 &ossl_ctx_global_properties_method); 154 155 return globp != NULL && globp->no_mirrored ? 1 : 0; 156 } 157 158 void ossl_global_properties_stop_mirroring(OSSL_LIB_CTX *libctx) 159 { 160 OSSL_GLOBAL_PROPERTIES *globp 161 = ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_GLOBAL_PROPERTIES, 162 &ossl_ctx_global_properties_method); 163 164 if (globp != NULL) 165 globp->no_mirrored = 1; 166 } 167 #endif 168 169 static int ossl_method_up_ref(METHOD *method) 170 { 171 return (*method->up_ref)(method->method); 172 } 173 174 static void ossl_method_free(METHOD *method) 175 { 176 (*method->free)(method->method); 177 } 178 179 static __owur int ossl_property_read_lock(OSSL_METHOD_STORE *p) 180 { 181 return p != NULL ? CRYPTO_THREAD_read_lock(p->lock) : 0; 182 } 183 184 static __owur int ossl_property_write_lock(OSSL_METHOD_STORE *p) 185 { 186 return p != NULL ? CRYPTO_THREAD_write_lock(p->lock) : 0; 187 } 188 189 static int ossl_property_unlock(OSSL_METHOD_STORE *p) 190 { 191 return p != 0 ? CRYPTO_THREAD_unlock(p->lock) : 0; 192 } 193 194 static unsigned long query_hash(const QUERY *a) 195 { 196 return OPENSSL_LH_strhash(a->query); 197 } 198 199 static int query_cmp(const QUERY *a, const QUERY *b) 200 { 201 int res = strcmp(a->query, b->query); 202 203 if (res == 0 && a->provider != NULL && b->provider != NULL) 204 res = b->provider > a->provider ? 1 205 : b->provider < a->provider ? -1 206 : 0; 207 return res; 208 } 209 210 static void impl_free(IMPLEMENTATION *impl) 211 { 212 if (impl != NULL) { 213 ossl_method_free(&impl->method); 214 OPENSSL_free(impl); 215 } 216 } 217 218 static void impl_cache_free(QUERY *elem) 219 { 220 if (elem != NULL) { 221 ossl_method_free(&elem->method); 222 OPENSSL_free(elem); 223 } 224 } 225 226 static void impl_cache_flush_alg(ossl_uintmax_t idx, ALGORITHM *alg) 227 { 228 lh_QUERY_doall(alg->cache, &impl_cache_free); 229 lh_QUERY_flush(alg->cache); 230 } 231 232 static void alg_cleanup(ossl_uintmax_t idx, ALGORITHM *a, void *arg) 233 { 234 OSSL_METHOD_STORE *store = arg; 235 236 if (a != NULL) { 237 sk_IMPLEMENTATION_pop_free(a->impls, &impl_free); 238 lh_QUERY_doall(a->cache, &impl_cache_free); 239 lh_QUERY_free(a->cache); 240 OPENSSL_free(a); 241 } 242 if (store != NULL) 243 ossl_sa_ALGORITHM_set(store->algs, idx, NULL); 244 } 245 246 /* 247 * The OSSL_LIB_CTX param here allows access to underlying property data needed 248 * for computation 249 */ 250 OSSL_METHOD_STORE *ossl_method_store_new(OSSL_LIB_CTX *ctx) 251 { 252 OSSL_METHOD_STORE *res; 253 254 res = OPENSSL_zalloc(sizeof(*res)); 255 if (res != NULL) { 256 res->ctx = ctx; 257 if ((res->algs = ossl_sa_ALGORITHM_new()) == NULL 258 || (res->lock = CRYPTO_THREAD_lock_new()) == NULL 259 || (res->biglock = CRYPTO_THREAD_lock_new()) == NULL) { 260 ossl_method_store_free(res); 261 return NULL; 262 } 263 } 264 return res; 265 } 266 267 void ossl_method_store_free(OSSL_METHOD_STORE *store) 268 { 269 if (store != NULL) { 270 if (store->algs != NULL) 271 ossl_sa_ALGORITHM_doall_arg(store->algs, &alg_cleanup, store); 272 ossl_sa_ALGORITHM_free(store->algs); 273 CRYPTO_THREAD_lock_free(store->lock); 274 CRYPTO_THREAD_lock_free(store->biglock); 275 OPENSSL_free(store); 276 } 277 } 278 279 int ossl_method_lock_store(OSSL_METHOD_STORE *store) 280 { 281 return store != NULL ? CRYPTO_THREAD_write_lock(store->biglock) : 0; 282 } 283 284 int ossl_method_unlock_store(OSSL_METHOD_STORE *store) 285 { 286 return store != NULL ? CRYPTO_THREAD_unlock(store->biglock) : 0; 287 } 288 289 static ALGORITHM *ossl_method_store_retrieve(OSSL_METHOD_STORE *store, int nid) 290 { 291 return ossl_sa_ALGORITHM_get(store->algs, nid); 292 } 293 294 static int ossl_method_store_insert(OSSL_METHOD_STORE *store, ALGORITHM *alg) 295 { 296 return ossl_sa_ALGORITHM_set(store->algs, alg->nid, alg); 297 } 298 299 int ossl_method_store_add(OSSL_METHOD_STORE *store, const OSSL_PROVIDER *prov, 300 int nid, const char *properties, void *method, 301 int (*method_up_ref)(void *), 302 void (*method_destruct)(void *)) 303 { 304 ALGORITHM *alg = NULL; 305 IMPLEMENTATION *impl; 306 int ret = 0; 307 int i; 308 309 if (nid <= 0 || method == NULL || store == NULL) 310 return 0; 311 if (properties == NULL) 312 properties = ""; 313 314 if (!ossl_assert(prov != NULL)) 315 return 0; 316 317 /* Create new entry */ 318 impl = OPENSSL_malloc(sizeof(*impl)); 319 if (impl == NULL) 320 return 0; 321 impl->method.method = method; 322 impl->method.up_ref = method_up_ref; 323 impl->method.free = method_destruct; 324 if (!ossl_method_up_ref(&impl->method)) { 325 OPENSSL_free(impl); 326 return 0; 327 } 328 impl->provider = prov; 329 330 /* Insert into the hash table if required */ 331 if (!ossl_property_write_lock(store)) { 332 OPENSSL_free(impl); 333 return 0; 334 } 335 ossl_method_cache_flush(store, nid); 336 if ((impl->properties = ossl_prop_defn_get(store->ctx, properties)) == NULL) { 337 impl->properties = ossl_parse_property(store->ctx, properties); 338 if (impl->properties == NULL) 339 goto err; 340 if (!ossl_prop_defn_set(store->ctx, properties, &impl->properties)) { 341 ossl_property_free(impl->properties); 342 impl->properties = NULL; 343 goto err; 344 } 345 } 346 347 alg = ossl_method_store_retrieve(store, nid); 348 if (alg == NULL) { 349 if ((alg = OPENSSL_zalloc(sizeof(*alg))) == NULL 350 || (alg->impls = sk_IMPLEMENTATION_new_null()) == NULL 351 || (alg->cache = lh_QUERY_new(&query_hash, &query_cmp)) == NULL) 352 goto err; 353 alg->nid = nid; 354 if (!ossl_method_store_insert(store, alg)) 355 goto err; 356 } 357 358 /* Push onto stack if there isn't one there already */ 359 for (i = 0; i < sk_IMPLEMENTATION_num(alg->impls); i++) { 360 const IMPLEMENTATION *tmpimpl = sk_IMPLEMENTATION_value(alg->impls, i); 361 362 if (tmpimpl->provider == impl->provider 363 && tmpimpl->properties == impl->properties) 364 break; 365 } 366 if (i == sk_IMPLEMENTATION_num(alg->impls) 367 && sk_IMPLEMENTATION_push(alg->impls, impl)) 368 ret = 1; 369 ossl_property_unlock(store); 370 if (ret == 0) 371 impl_free(impl); 372 return ret; 373 374 err: 375 ossl_property_unlock(store); 376 alg_cleanup(0, alg, NULL); 377 impl_free(impl); 378 return 0; 379 } 380 381 int ossl_method_store_remove(OSSL_METHOD_STORE *store, int nid, 382 const void *method) 383 { 384 ALGORITHM *alg = NULL; 385 int i; 386 387 if (nid <= 0 || method == NULL || store == NULL) 388 return 0; 389 390 if (!ossl_property_write_lock(store)) 391 return 0; 392 ossl_method_cache_flush(store, nid); 393 alg = ossl_method_store_retrieve(store, nid); 394 if (alg == NULL) { 395 ossl_property_unlock(store); 396 return 0; 397 } 398 399 /* 400 * A sorting find then a delete could be faster but these stacks should be 401 * relatively small, so we avoid the overhead. Sorting could also surprise 402 * users when result orderings change (even though they are not guaranteed). 403 */ 404 for (i = 0; i < sk_IMPLEMENTATION_num(alg->impls); i++) { 405 IMPLEMENTATION *impl = sk_IMPLEMENTATION_value(alg->impls, i); 406 407 if (impl->method.method == method) { 408 impl_free(impl); 409 (void)sk_IMPLEMENTATION_delete(alg->impls, i); 410 ossl_property_unlock(store); 411 return 1; 412 } 413 } 414 ossl_property_unlock(store); 415 return 0; 416 } 417 418 struct alg_cleanup_by_provider_data_st { 419 OSSL_METHOD_STORE *store; 420 const OSSL_PROVIDER *prov; 421 }; 422 423 static void 424 alg_cleanup_by_provider(ossl_uintmax_t idx, ALGORITHM *alg, void *arg) 425 { 426 struct alg_cleanup_by_provider_data_st *data = arg; 427 int i, count; 428 429 /* 430 * We walk the stack backwards, to avoid having to deal with stack shifts 431 * caused by deletion 432 */ 433 for (count = 0, i = sk_IMPLEMENTATION_num(alg->impls); i-- > 0;) { 434 IMPLEMENTATION *impl = sk_IMPLEMENTATION_value(alg->impls, i); 435 436 if (impl->provider == data->prov) { 437 impl_free(impl); 438 (void)sk_IMPLEMENTATION_delete(alg->impls, i); 439 count++; 440 } 441 } 442 443 /* 444 * If we removed any implementation, we also clear the whole associated 445 * cache, 'cause that's the sensible thing to do. 446 * There's no point flushing the cache entries where we didn't remove 447 * any implementation, though. 448 */ 449 if (count > 0) 450 ossl_method_cache_flush_alg(data->store, alg); 451 } 452 453 int ossl_method_store_remove_all_provided(OSSL_METHOD_STORE *store, 454 const OSSL_PROVIDER *prov) 455 { 456 struct alg_cleanup_by_provider_data_st data; 457 458 if (!ossl_property_write_lock(store)) 459 return 0; 460 data.prov = prov; 461 data.store = store; 462 ossl_sa_ALGORITHM_doall_arg(store->algs, &alg_cleanup_by_provider, &data); 463 ossl_property_unlock(store); 464 return 1; 465 } 466 467 static void alg_do_one(ALGORITHM *alg, IMPLEMENTATION *impl, 468 void (*fn)(int id, void *method, void *fnarg), 469 void *fnarg) 470 { 471 fn(alg->nid, impl->method.method, fnarg); 472 } 473 474 static void alg_copy(ossl_uintmax_t idx, ALGORITHM *alg, void *arg) 475 { 476 STACK_OF(ALGORITHM) *newalg = arg; 477 478 (void)sk_ALGORITHM_push(newalg, alg); 479 } 480 481 void ossl_method_store_do_all(OSSL_METHOD_STORE *store, 482 void (*fn)(int id, void *method, void *fnarg), 483 void *fnarg) 484 { 485 int i, j; 486 int numalgs, numimps; 487 STACK_OF(ALGORITHM) *tmpalgs; 488 ALGORITHM *alg; 489 490 if (store != NULL) { 491 492 if (!ossl_property_read_lock(store)) 493 return; 494 495 tmpalgs = sk_ALGORITHM_new_reserve(NULL, 496 ossl_sa_ALGORITHM_num(store->algs)); 497 if (tmpalgs == NULL) { 498 ossl_property_unlock(store); 499 return; 500 } 501 502 ossl_sa_ALGORITHM_doall_arg(store->algs, alg_copy, tmpalgs); 503 ossl_property_unlock(store); 504 numalgs = sk_ALGORITHM_num(tmpalgs); 505 for (i = 0; i < numalgs; i++) { 506 alg = sk_ALGORITHM_value(tmpalgs, i); 507 numimps = sk_IMPLEMENTATION_num(alg->impls); 508 for (j = 0; j < numimps; j++) 509 alg_do_one(alg, sk_IMPLEMENTATION_value(alg->impls, j), fn, fnarg); 510 } 511 sk_ALGORITHM_free(tmpalgs); 512 } 513 } 514 515 int ossl_method_store_fetch(OSSL_METHOD_STORE *store, 516 int nid, const char *prop_query, 517 const OSSL_PROVIDER **prov_rw, void **method) 518 { 519 OSSL_PROPERTY_LIST **plp; 520 ALGORITHM *alg; 521 IMPLEMENTATION *impl, *best_impl = NULL; 522 OSSL_PROPERTY_LIST *pq = NULL, *p2 = NULL; 523 const OSSL_PROVIDER *prov = prov_rw != NULL ? *prov_rw : NULL; 524 int ret = 0; 525 int j, best = -1, score, optional; 526 527 if (nid <= 0 || method == NULL || store == NULL) 528 return 0; 529 530 #if !defined(FIPS_MODULE) && !defined(OPENSSL_NO_AUTOLOAD_CONFIG) 531 if (ossl_lib_ctx_is_default(store->ctx) 532 && !OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CONFIG, NULL)) 533 return 0; 534 #endif 535 536 /* This only needs to be a read lock, because the query won't create anything */ 537 if (!ossl_property_read_lock(store)) 538 return 0; 539 alg = ossl_method_store_retrieve(store, nid); 540 if (alg == NULL) { 541 ossl_property_unlock(store); 542 return 0; 543 } 544 545 if (prop_query != NULL) 546 p2 = pq = ossl_parse_query(store->ctx, prop_query, 0); 547 plp = ossl_ctx_global_properties(store->ctx, 0); 548 if (plp != NULL && *plp != NULL) { 549 if (pq == NULL) { 550 pq = *plp; 551 } else { 552 p2 = ossl_property_merge(pq, *plp); 553 ossl_property_free(pq); 554 if (p2 == NULL) 555 goto fin; 556 pq = p2; 557 } 558 } 559 560 if (pq == NULL) { 561 for (j = 0; j < sk_IMPLEMENTATION_num(alg->impls); j++) { 562 if ((impl = sk_IMPLEMENTATION_value(alg->impls, j)) != NULL 563 && (prov == NULL || impl->provider == prov)) { 564 best_impl = impl; 565 ret = 1; 566 break; 567 } 568 } 569 goto fin; 570 } 571 optional = ossl_property_has_optional(pq); 572 for (j = 0; j < sk_IMPLEMENTATION_num(alg->impls); j++) { 573 if ((impl = sk_IMPLEMENTATION_value(alg->impls, j)) != NULL 574 && (prov == NULL || impl->provider == prov)) { 575 score = ossl_property_match_count(pq, impl->properties); 576 if (score > best) { 577 best_impl = impl; 578 best = score; 579 ret = 1; 580 if (!optional) 581 goto fin; 582 } 583 } 584 } 585 fin: 586 if (ret && ossl_method_up_ref(&best_impl->method)) { 587 *method = best_impl->method.method; 588 if (prov_rw != NULL) 589 *prov_rw = best_impl->provider; 590 } else { 591 ret = 0; 592 } 593 ossl_property_unlock(store); 594 ossl_property_free(p2); 595 return ret; 596 } 597 598 static void ossl_method_cache_flush_alg(OSSL_METHOD_STORE *store, 599 ALGORITHM *alg) 600 { 601 store->cache_nelem -= lh_QUERY_num_items(alg->cache); 602 impl_cache_flush_alg(0, alg); 603 } 604 605 static void ossl_method_cache_flush(OSSL_METHOD_STORE *store, int nid) 606 { 607 ALGORITHM *alg = ossl_method_store_retrieve(store, nid); 608 609 if (alg != NULL) 610 ossl_method_cache_flush_alg(store, alg); 611 } 612 613 int ossl_method_store_cache_flush_all(OSSL_METHOD_STORE *store) 614 { 615 if (!ossl_property_write_lock(store)) 616 return 0; 617 ossl_sa_ALGORITHM_doall(store->algs, &impl_cache_flush_alg); 618 store->cache_nelem = 0; 619 ossl_property_unlock(store); 620 return 1; 621 } 622 623 IMPLEMENT_LHASH_DOALL_ARG(QUERY, IMPL_CACHE_FLUSH); 624 625 /* 626 * Flush an element from the query cache (perhaps). 627 * 628 * In order to avoid taking a write lock or using atomic operations 629 * to keep accurate least recently used (LRU) or least frequently used 630 * (LFU) information, the procedure used here is to stochastically 631 * flush approximately half the cache. 632 * 633 * This procedure isn't ideal, LRU or LFU would be better. However, 634 * in normal operation, reaching a full cache would be unexpected. 635 * It means that no steady state of algorithm queries has been reached. 636 * That is, it is most likely an attack of some form. A suboptimal clearance 637 * strategy that doesn't degrade performance of the normal case is 638 * preferable to a more refined approach that imposes a performance 639 * impact. 640 */ 641 static void impl_cache_flush_cache(QUERY *c, IMPL_CACHE_FLUSH *state) 642 { 643 uint32_t n; 644 645 /* 646 * Implement the 32 bit xorshift as suggested by George Marsaglia in: 647 * https://doi.org/10.18637/jss.v008.i14 648 * 649 * This is a very fast PRNG so there is no need to extract bits one at a 650 * time and use the entire value each time. 651 */ 652 n = state->seed; 653 n ^= n << 13; 654 n ^= n >> 17; 655 n ^= n << 5; 656 state->seed = n; 657 658 if ((n & 1) != 0) 659 impl_cache_free(lh_QUERY_delete(state->cache, c)); 660 else 661 state->nelem++; 662 } 663 664 static void impl_cache_flush_one_alg(ossl_uintmax_t idx, ALGORITHM *alg, 665 void *v) 666 { 667 IMPL_CACHE_FLUSH *state = (IMPL_CACHE_FLUSH *)v; 668 unsigned long orig_down_load = lh_QUERY_get_down_load(alg->cache); 669 670 state->cache = alg->cache; 671 lh_QUERY_set_down_load(alg->cache, 0); 672 lh_QUERY_doall_IMPL_CACHE_FLUSH(state->cache, &impl_cache_flush_cache, 673 state); 674 lh_QUERY_set_down_load(alg->cache, orig_down_load); 675 } 676 677 static void ossl_method_cache_flush_some(OSSL_METHOD_STORE *store) 678 { 679 IMPL_CACHE_FLUSH state; 680 static TSAN_QUALIFIER uint32_t global_seed = 1; 681 682 state.nelem = 0; 683 state.using_global_seed = 0; 684 if ((state.seed = OPENSSL_rdtsc()) == 0) { 685 /* If there is no timer available, seed another way */ 686 state.using_global_seed = 1; 687 state.seed = tsan_load(&global_seed); 688 } 689 store->cache_need_flush = 0; 690 ossl_sa_ALGORITHM_doall_arg(store->algs, &impl_cache_flush_one_alg, &state); 691 store->cache_nelem = state.nelem; 692 /* Without a timer, update the global seed */ 693 if (state.using_global_seed) 694 tsan_store(&global_seed, state.seed); 695 } 696 697 int ossl_method_store_cache_get(OSSL_METHOD_STORE *store, OSSL_PROVIDER *prov, 698 int nid, const char *prop_query, void **method) 699 { 700 ALGORITHM *alg; 701 QUERY elem, *r; 702 int res = 0; 703 704 if (nid <= 0 || store == NULL || prop_query == NULL) 705 return 0; 706 707 if (!ossl_property_read_lock(store)) 708 return 0; 709 alg = ossl_method_store_retrieve(store, nid); 710 if (alg == NULL) 711 goto err; 712 713 elem.query = prop_query; 714 elem.provider = prov; 715 r = lh_QUERY_retrieve(alg->cache, &elem); 716 if (r == NULL) 717 goto err; 718 if (ossl_method_up_ref(&r->method)) { 719 *method = r->method.method; 720 res = 1; 721 } 722 err: 723 ossl_property_unlock(store); 724 return res; 725 } 726 727 int ossl_method_store_cache_set(OSSL_METHOD_STORE *store, OSSL_PROVIDER *prov, 728 int nid, const char *prop_query, void *method, 729 int (*method_up_ref)(void *), 730 void (*method_destruct)(void *)) 731 { 732 QUERY elem, *old, *p = NULL; 733 ALGORITHM *alg; 734 size_t len; 735 int res = 1; 736 737 if (nid <= 0 || store == NULL || prop_query == NULL) 738 return 0; 739 740 if (!ossl_assert(prov != NULL)) 741 return 0; 742 743 if (!ossl_property_write_lock(store)) 744 return 0; 745 if (store->cache_need_flush) 746 ossl_method_cache_flush_some(store); 747 alg = ossl_method_store_retrieve(store, nid); 748 if (alg == NULL) 749 goto err; 750 751 if (method == NULL) { 752 elem.query = prop_query; 753 elem.provider = prov; 754 if ((old = lh_QUERY_delete(alg->cache, &elem)) != NULL) { 755 impl_cache_free(old); 756 store->cache_nelem--; 757 } 758 goto end; 759 } 760 p = OPENSSL_malloc(sizeof(*p) + (len = strlen(prop_query))); 761 if (p != NULL) { 762 p->query = p->body; 763 p->provider = prov; 764 p->method.method = method; 765 p->method.up_ref = method_up_ref; 766 p->method.free = method_destruct; 767 if (!ossl_method_up_ref(&p->method)) 768 goto err; 769 memcpy((char *)p->query, prop_query, len + 1); 770 if ((old = lh_QUERY_insert(alg->cache, p)) != NULL) { 771 impl_cache_free(old); 772 goto end; 773 } 774 if (!lh_QUERY_error(alg->cache)) { 775 if (++store->cache_nelem >= IMPL_CACHE_FLUSH_THRESHOLD) 776 store->cache_need_flush = 1; 777 goto end; 778 } 779 ossl_method_free(&p->method); 780 } 781 err: 782 res = 0; 783 OPENSSL_free(p); 784 end: 785 ossl_property_unlock(store); 786 return res; 787 } 788