crypto/provider_core.c

   1 /*
   2  * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <openssl/core.h>
  11 #include <openssl/core_numbers.h>
  12 #include <openssl/core_names.h>
  13 #include <openssl/provider.h>
  14 #include <openssl/params.h>
  15 #include <openssl/opensslv.h>
  16 #include "crypto/cryptlib.h"
  17 #include "internal/nelem.h"
  18 #include "internal/thread_once.h"
  19 #include "internal/provider.h"
  20 #include "internal/refcount.h"
  21 #include "provider_local.h"
  22 #ifndef FIPS_MODE
  23 # include <openssl/self_test.h>
  24 #endif
  25
  26 static OSSL_PROVIDER *provider_new(const char *name,
  27                                    OSSL_provider_init_fn *init_function);
  28
  29 /*-
  30  * Provider Object structure
  31  * =========================
  32  */
  33
  34 typedef struct {
  35     char *name;
  36     char *value;
  37 } INFOPAIR;
  38 DEFINE_STACK_OF(INFOPAIR)
  39
  40 struct provider_store_st;        /* Forward declaration */
  41
  42 struct ossl_provider_st {
  43     /* Flag bits */
  44     unsigned int flag_initialized:1;
  45     unsigned int flag_fallback:1;
  46
  47     /* OpenSSL library side data */
  48     CRYPTO_REF_COUNT refcnt;
  49     CRYPTO_RWLOCK *refcnt_lock;  /* For the ref counter */
  50     char *name;
  51     char *path;
  52     DSO *module;
  53     OSSL_provider_init_fn *init_function;
  54     STACK_OF(INFOPAIR) *parameters;
  55     OPENSSL_CTX *libctx; /* The library context this instance is in */
  56     struct provider_store_st *store; /* The store this instance belongs to */
  57 #ifndef FIPS_MODE
  58     /*
  59      * In the FIPS module inner provider, this isn't needed, since the
  60      * error upcalls are always direct calls to the outer provider.
  61      */
  62     int error_lib;     /* ERR library number, one for each provider */
  63 # ifndef OPENSSL_NO_ERR
  64     ERR_STRING_DATA *error_strings; /* Copy of what the provider gives us */
  65 # endif
  66 #endif
  67
  68     /* Provider side functions */
  69     OSSL_provider_teardown_fn *teardown;
  70     OSSL_provider_gettable_params_fn *gettable_params;
  71     OSSL_provider_get_params_fn *get_params;
  72     OSSL_provider_query_operation_fn *query_operation;
  73
  74     /* Provider side data */
  75     void *provctx;
  76 };
  77 DEFINE_STACK_OF(OSSL_PROVIDER)
  78
  79 static int ossl_provider_cmp(const OSSL_PROVIDER * const *a,
  80                              const OSSL_PROVIDER * const *b)
  81 {
  82     return strcmp((*a)->name, (*b)->name);
  83 }
  84
  85 /*-
  86  * Provider Object store
  87  * =====================
  88  *
  89  * The Provider Object store is a library context object, and therefore needs
  90  * an index.
  91  */
  92
  93 struct provider_store_st {
  94     STACK_OF(OSSL_PROVIDER) *providers;
  95     CRYPTO_RWLOCK *lock;
  96     char *default_path;
  97     unsigned int use_fallbacks:1;
  98 };
  99
 100 static void provider_store_free(void *vstore)
 101 {
 102     struct provider_store_st *store = vstore;
 103
 104     if (store == NULL)
 105         return;
 106     OPENSSL_free(store->default_path);
 107     sk_OSSL_PROVIDER_pop_free(store->providers, ossl_provider_free);
 108     CRYPTO_THREAD_lock_free(store->lock);
 109     OPENSSL_free(store);
 110 }
 111
 112 static void *provider_store_new(OPENSSL_CTX *ctx)
 113 {
 114     struct provider_store_st *store = OPENSSL_zalloc(sizeof(*store));
 115     const struct predefined_providers_st *p = NULL;
 116
 117     if (store == NULL
 118         || (store->providers = sk_OSSL_PROVIDER_new(ossl_provider_cmp)) == NULL
 119         || (store->lock = CRYPTO_THREAD_lock_new()) == NULL) {
 120         provider_store_free(store);
 121         return NULL;
 122     }
 123     store->use_fallbacks = 1;
 124
 125     for (p = predefined_providers; p->name != NULL; p++) {
 126         OSSL_PROVIDER *prov = NULL;
 127
 128         /*
 129          * We use the internal constructor directly here,
 130          * otherwise we get a call loop
 131          */
 132         prov = provider_new(p->name, p->init);
 133
 134         if (prov == NULL
 135             || sk_OSSL_PROVIDER_push(store->providers, prov) == 0) {
 136             ossl_provider_free(prov);
 137             provider_store_free(store);
 138             CRYPTOerr(CRYPTO_F_PROVIDER_STORE_NEW, ERR_R_INTERNAL_ERROR);
 139             return NULL;
 140         }
 141         prov->libctx = ctx;
 142         prov->store = store;
 143 #ifndef FIPS_MODE
 144         prov->error_lib = ERR_get_next_error_library();
 145 #endif
 146         if(p->is_fallback)
 147             ossl_provider_set_fallback(prov);
 148     }
 149
 150     return store;
 151 }
 152
 153 static const OPENSSL_CTX_METHOD provider_store_method = {
 154     provider_store_new,
 155     provider_store_free,
 156 };
 157
 158 static struct provider_store_st *get_provider_store(OPENSSL_CTX *libctx)
 159 {
 160     struct provider_store_st *store = NULL;
 161
 162     store = openssl_ctx_get_data(libctx, OPENSSL_CTX_PROVIDER_STORE_INDEX,
 163                                  &provider_store_method);
 164     if (store == NULL)
 165         CRYPTOerr(CRYPTO_F_GET_PROVIDER_STORE, ERR_R_INTERNAL_ERROR);
 166     return store;
 167 }
 168
 169 OSSL_PROVIDER *ossl_provider_find(OPENSSL_CTX *libctx, const char *name,
 170                                   int noconfig)
 171 {
 172     struct provider_store_st *store = NULL;
 173     OSSL_PROVIDER *prov = NULL;
 174
 175     if ((store = get_provider_store(libctx)) != NULL) {
 176         OSSL_PROVIDER tmpl = { 0, };
 177         int i;
 178
 179 #ifndef FIPS_MODE
 180         /*
 181          * Make sure any providers are loaded from config before we try to find
 182          * them.
 183          */
 184         if (!noconfig)
 185             OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CONFIG, NULL);
 186 #endif
 187
 188         tmpl.name = (char *)name;
 189         CRYPTO_THREAD_write_lock(store->lock);
 190         if ((i = sk_OSSL_PROVIDER_find(store->providers, &tmpl)) == -1
 191             || (prov = sk_OSSL_PROVIDER_value(store->providers, i)) == NULL
 192             || !ossl_provider_up_ref(prov))
 193             prov = NULL;
 194         CRYPTO_THREAD_unlock(store->lock);
 195     }
 196
 197     return prov;
 198 }
 199
 200 /*-
 201  * Provider Object methods
 202  * =======================
 203  */
 204
 205 static OSSL_PROVIDER *provider_new(const char *name,
 206                                    OSSL_provider_init_fn *init_function)
 207 {
 208     OSSL_PROVIDER *prov = NULL;
 209
 210     if ((prov = OPENSSL_zalloc(sizeof(*prov))) == NULL
 211 #ifndef HAVE_ATOMICS
 212         || (prov->refcnt_lock = CRYPTO_THREAD_lock_new()) == NULL
 213 #endif
 214         || !ossl_provider_up_ref(prov) /* +1 One reference to be returned */
 215         || (prov->name = OPENSSL_strdup(name)) == NULL) {
 216         ossl_provider_free(prov);
 217         CRYPTOerr(CRYPTO_F_PROVIDER_NEW, ERR_R_MALLOC_FAILURE);
 218         return NULL;
 219     }
 220
 221     prov->init_function = init_function;
 222     return prov;
 223 }
 224
 225 int ossl_provider_up_ref(OSSL_PROVIDER *prov)
 226 {
 227     int ref = 0;
 228
 229     if (CRYPTO_UP_REF(&prov->refcnt, &ref, prov->refcnt_lock) <= 0)
 230         return 0;
 231     return ref;
 232 }
 233
 234 OSSL_PROVIDER *ossl_provider_new(OPENSSL_CTX *libctx, const char *name,
 235                                  OSSL_provider_init_fn *init_function,
 236                                  int noconfig)
 237 {
 238     struct provider_store_st *store = NULL;
 239     OSSL_PROVIDER *prov = NULL;
 240
 241     if ((store = get_provider_store(libctx)) == NULL)
 242         return NULL;
 243
 244     if ((prov = ossl_provider_find(libctx, name,
 245                                    noconfig)) != NULL) { /* refcount +1 */
 246         ossl_provider_free(prov); /* refcount -1 */
 247         ERR_raise_data(ERR_LIB_CRYPTO, CRYPTO_R_PROVIDER_ALREADY_EXISTS, NULL,
 248                        "name=%s", name);
 249         return NULL;
 250     }
 251
 252     /* provider_new() generates an error, so no need here */
 253     if ((prov = provider_new(name, init_function)) == NULL)
 254         return NULL;
 255
 256     CRYPTO_THREAD_write_lock(store->lock);
 257     if (!ossl_provider_up_ref(prov)) { /* +1 One reference for the store */
 258         ossl_provider_free(prov); /* -1 Reference that was to be returned */
 259         prov = NULL;
 260     } else if (sk_OSSL_PROVIDER_push(store->providers, prov) == 0) {
 261         ossl_provider_free(prov); /* -1 Store reference */
 262         ossl_provider_free(prov); /* -1 Reference that was to be returned */
 263         prov = NULL;
 264     } else {
 265         prov->libctx = libctx;
 266         prov->store = store;
 267 #ifndef FIPS_MODE
 268         prov->error_lib = ERR_get_next_error_library();
 269 #endif
 270     }
 271     CRYPTO_THREAD_unlock(store->lock);
 272
 273     if (prov == NULL)
 274         CRYPTOerr(CRYPTO_F_OSSL_PROVIDER_NEW, ERR_R_MALLOC_FAILURE);
 275
 276     /*
 277      * At this point, the provider is only partially "loaded".  To be
 278      * fully "loaded", ossl_provider_activate() must also be called.
 279      */
 280
 281     return prov;
 282 }
 283
 284 static void free_infopair(INFOPAIR *pair)
 285 {
 286     OPENSSL_free(pair->name);
 287     OPENSSL_free(pair->value);
 288     OPENSSL_free(pair);
 289 }
 290
 291 void ossl_provider_free(OSSL_PROVIDER *prov)
 292 {
 293     if (prov != NULL) {
 294         int ref = 0;
 295
 296         CRYPTO_DOWN_REF(&prov->refcnt, &ref, prov->refcnt_lock);
 297
 298         /*
 299          * When the refcount drops below two, the store is the only
 300          * possible reference, or it has already been taken away from
 301          * the store (this may happen if a provider was activated
 302          * because it's a fallback, but isn't currently used)
 303          * When that happens, the provider is inactivated.
 304          */
 305         if (ref < 2 && prov->flag_initialized) {
 306 #ifndef FIPS_MODE
 307             ossl_init_thread_deregister(prov);
 308 #endif
 309             if (prov->teardown != NULL)
 310                 prov->teardown(prov->provctx);
 311 #ifndef OPENSSL_NO_ERR
 312 # ifndef FIPS_MODE
 313             if (prov->error_strings != NULL) {
 314                 ERR_unload_strings(prov->error_lib, prov->error_strings);
 315                 OPENSSL_free(prov->error_strings);
 316                 prov->error_strings = NULL;
 317             }
 318 # endif
 319 #endif
 320             prov->flag_initialized = 0;
 321         }
 322
 323         /*
 324          * When the refcount drops to zero, it has been taken out of
 325          * the store.  All we have to do here is clean it out.
 326          */
 327         if (ref == 0) {
 328 #ifndef FIPS_MODE
 329             DSO_free(prov->module);
 330 #endif
 331             OPENSSL_free(prov->name);
 332             OPENSSL_free(prov->path);
 333             sk_INFOPAIR_pop_free(prov->parameters, free_infopair);
 334 #ifndef HAVE_ATOMICS
 335             CRYPTO_THREAD_lock_free(prov->refcnt_lock);
 336 #endif
 337             OPENSSL_free(prov);
 338         }
 339     }
 340 }
 341
 342 /* Setters */
 343 int ossl_provider_set_module_path(OSSL_PROVIDER *prov, const char *module_path)
 344 {
 345     OPENSSL_free(prov->path);
 346     if (module_path == NULL)
 347         return 1;
 348     if ((prov->path = OPENSSL_strdup(module_path)) != NULL)
 349         return 1;
 350     CRYPTOerr(CRYPTO_F_OSSL_PROVIDER_SET_MODULE_PATH, ERR_R_MALLOC_FAILURE);
 351     return 0;
 352 }
 353
 354 int ossl_provider_add_parameter(OSSL_PROVIDER *prov,
 355                                 const char *name, const char *value)
 356 {
 357     INFOPAIR *pair = NULL;
 358
 359     if ((pair = OPENSSL_zalloc(sizeof(*pair))) != NULL
 360         && (prov->parameters != NULL
 361             || (prov->parameters = sk_INFOPAIR_new_null()) != NULL)
 362         && (pair->name = OPENSSL_strdup(name)) != NULL
 363         && (pair->value = OPENSSL_strdup(value)) != NULL
 364         && sk_INFOPAIR_push(prov->parameters, pair) > 0)
 365         return 1;
 366
 367     if (pair != NULL) {
 368         OPENSSL_free(pair->name);
 369         OPENSSL_free(pair->value);
 370         OPENSSL_free(pair);
 371     }
 372     CRYPTOerr(CRYPTO_F_OSSL_PROVIDER_ADD_PARAMETER, ERR_R_MALLOC_FAILURE);
 373     return 0;
 374 }
 375
 376 /*
 377  * Provider activation.
 378  *
 379  * What "activation" means depends on the provider form; for built in
 380  * providers (in the library or the application alike), the provider
 381  * can already be considered to be loaded, all that's needed is to
 382  * initialize it.  However, for dynamically loadable provider modules,
 383  * we must first load that module.
 384  *
 385  * Built in modules are distinguished from dynamically loaded modules
 386  * with an already assigned init function.
 387  */
 388 static const OSSL_DISPATCH *core_dispatch; /* Define further down */
 389
 390 int OSSL_PROVIDER_set_default_search_path(OPENSSL_CTX *libctx, const char *path)
 391 {
 392     struct provider_store_st *store;
 393     char *p = NULL;
 394
 395     if (path != NULL) {
 396         p = OPENSSL_strdup(path);
 397         if (p == NULL) {
 398             CRYPTOerr(0, ERR_R_MALLOC_FAILURE);
 399             return 0;
 400         }
 401     }
 402     if ((store = get_provider_store(libctx)) != NULL
 403             && CRYPTO_THREAD_write_lock(store->lock)) {
 404         OPENSSL_free(store->default_path);
 405         store->default_path = p;
 406         CRYPTO_THREAD_unlock(store->lock);
 407         return 1;
 408     }
 409     OPENSSL_free(p);
 410     return 0;
 411 }
 412
 413 /*
 414  * Internal version that doesn't affect the store flags, and thereby avoid
 415  * locking.  Direct callers must remember to set the store flags when
 416  * appropriate.
 417  */
 418 static int provider_activate(OSSL_PROVIDER *prov)
 419 {
 420     const OSSL_DISPATCH *provider_dispatch = NULL;
 421 #ifndef OPENSSL_NO_ERR
 422 # ifndef FIPS_MODE
 423     OSSL_provider_get_reason_strings_fn *p_get_reason_strings = NULL;
 424 # endif
 425 #endif
 426
 427     if (prov->flag_initialized)
 428         return 1;
 429
 430     /*
 431      * If the init function isn't set, it indicates that this provider is
 432      * a loadable module.
 433      */
 434     if (prov->init_function == NULL) {
 435 #ifdef FIPS_MODE
 436         return 0;
 437 #else
 438         if (prov->module == NULL) {
 439             char *allocated_path = NULL;
 440             const char *module_path = NULL;
 441             char *merged_path = NULL;
 442             const char *load_dir = NULL;
 443             struct provider_store_st *store;
 444
 445             if ((prov->module = DSO_new()) == NULL) {
 446                 /* DSO_new() generates an error already */
 447                 return 0;
 448             }
 449
 450             if ((store = get_provider_store(prov->libctx)) == NULL
 451                     || !CRYPTO_THREAD_read_lock(store->lock))
 452                 return 0;
 453             load_dir = store->default_path;
 454
 455             if (load_dir == NULL) {
 456                 load_dir = ossl_safe_getenv("OPENSSL_MODULES");
 457                 if (load_dir == NULL)
 458                     load_dir = MODULESDIR;
 459             }
 460
 461             DSO_ctrl(prov->module, DSO_CTRL_SET_FLAGS,
 462                      DSO_FLAG_NAME_TRANSLATION_EXT_ONLY, NULL);
 463
 464             module_path = prov->path;
 465             if (module_path == NULL)
 466                 module_path = allocated_path =
 467                     DSO_convert_filename(prov->module, prov->name);
 468             if (module_path != NULL)
 469                 merged_path = DSO_merge(prov->module, module_path, load_dir);
 470             CRYPTO_THREAD_unlock(store->lock);
 471
 472             if (merged_path == NULL
 473                 || (DSO_load(prov->module, merged_path, NULL, 0)) == NULL) {
 474                 DSO_free(prov->module);
 475                 prov->module = NULL;
 476             }
 477
 478             OPENSSL_free(merged_path);
 479             OPENSSL_free(allocated_path);
 480         }
 481
 482         if (prov->module != NULL)
 483             prov->init_function = (OSSL_provider_init_fn *)
 484                 DSO_bind_func(prov->module, "OSSL_provider_init");
 485 #endif
 486     }
 487
 488     /* Call the initialise function for the provider. */
 489     if (prov->init_function == NULL
 490         || !prov->init_function(prov, core_dispatch, &provider_dispatch,
 491                                 &prov->provctx)) {
 492         ERR_raise_data(ERR_LIB_CRYPTO, ERR_R_INIT_FAIL, NULL,
 493                        "name=%s", prov->name);
 494 #ifndef FIPS_MODE
 495         DSO_free(prov->module);
 496         prov->module = NULL;
 497 #endif
 498         return 0;
 499     }
 500
 501     for (; provider_dispatch->function_id != 0; provider_dispatch++) {
 502         switch (provider_dispatch->function_id) {
 503         case OSSL_FUNC_PROVIDER_TEARDOWN:
 504             prov->teardown =
 505                 OSSL_get_provider_teardown(provider_dispatch);
 506             break;
 507         case OSSL_FUNC_PROVIDER_GETTABLE_PARAMS:
 508             prov->gettable_params =
 509                 OSSL_get_provider_gettable_params(provider_dispatch);
 510             break;
 511         case OSSL_FUNC_PROVIDER_GET_PARAMS:
 512             prov->get_params =
 513                 OSSL_get_provider_get_params(provider_dispatch);
 514             break;
 515         case OSSL_FUNC_PROVIDER_QUERY_OPERATION:
 516             prov->query_operation =
 517                 OSSL_get_provider_query_operation(provider_dispatch);
 518             break;
 519 #ifndef OPENSSL_NO_ERR
 520 # ifndef FIPS_MODE
 521         case OSSL_FUNC_PROVIDER_GET_REASON_STRINGS:
 522             p_get_reason_strings =
 523                 OSSL_get_provider_get_reason_strings(provider_dispatch);
 524             break;
 525 # endif
 526 #endif
 527         }
 528     }
 529
 530 #ifndef OPENSSL_NO_ERR
 531 # ifndef FIPS_MODE
 532     if (p_get_reason_strings != NULL) {
 533         const OSSL_ITEM *reasonstrings = p_get_reason_strings(prov->provctx);
 534         size_t cnt, cnt2;
 535
 536         /*
 537          * ERR_load_strings() handles ERR_STRING_DATA rather than OSSL_ITEM,
 538          * although they are essentially the same type.
 539          * Furthermore, ERR_load_strings() patches the array's error number
 540          * with the error library number, so we need to make a copy of that
 541          * array either way.
 542          */
 543         cnt = 0;
 544         while (reasonstrings[cnt].id != 0) {
 545             if (ERR_GET_LIB(reasonstrings[cnt].id) != 0)
 546                 return 0;
 547             cnt++;
 548         }
 549         cnt++;                   /* One for the terminating item */
 550
 551         /* Allocate one extra item for the "library" name */
 552         prov->error_strings =
 553             OPENSSL_zalloc(sizeof(ERR_STRING_DATA) * (cnt + 1));
 554         if (prov->error_strings == NULL)
 555             return 0;
 556
 557         /*
 558          * Set the "library" name.
 559          */
 560         prov->error_strings[0].error = ERR_PACK(prov->error_lib, 0, 0);
 561         prov->error_strings[0].string = prov->name;
 562         /*
 563          * Copy reasonstrings item 0..cnt-1 to prov->error_trings positions
 564          * 1..cnt.
 565          */
 566         for (cnt2 = 1; cnt2 <= cnt; cnt2++) {
 567             prov->error_strings[cnt2].error = (int)reasonstrings[cnt2-1].id;
 568             prov->error_strings[cnt2].string = reasonstrings[cnt2-1].ptr;
 569         }
 570
 571         ERR_load_strings(prov->error_lib, prov->error_strings);
 572     }
 573 # endif
 574 #endif
 575
 576     /* With this flag set, this provider has become fully "loaded". */
 577     prov->flag_initialized = 1;
 578
 579     return 1;
 580 }
 581
 582 int ossl_provider_activate(OSSL_PROVIDER *prov)
 583 {
 584     if (provider_activate(prov)) {
 585         CRYPTO_THREAD_write_lock(prov->store->lock);
 586         prov->store->use_fallbacks = 0;
 587         CRYPTO_THREAD_unlock(prov->store->lock);
 588         return 1;
 589     }
 590
 591     return 0;
 592 }
 593
 594 void *ossl_provider_ctx(const OSSL_PROVIDER *prov)
 595 {
 596     return prov->provctx;
 597 }
 598
 599
 600 static int provider_forall_loaded(struct provider_store_st *store,
 601                                   int *found_activated,
 602                                   int (*cb)(OSSL_PROVIDER *provider,
 603                                             void *cbdata),
 604                                   void *cbdata)
 605 {
 606     int i;
 607     int ret = 1;
 608     int num_provs;
 609
 610     num_provs = sk_OSSL_PROVIDER_num(store->providers);
 611
 612     if (found_activated != NULL)
 613         *found_activated = 0;
 614     for (i = 0; i < num_provs; i++) {
 615         OSSL_PROVIDER *prov =
 616             sk_OSSL_PROVIDER_value(store->providers, i);
 617
 618         if (prov->flag_initialized) {
 619             if (found_activated != NULL)
 620                 *found_activated = 1;
 621             if (!(ret = cb(prov, cbdata)))
 622                 break;
 623         }
 624     }
 625
 626     return ret;
 627 }
 628
 629 /*
 630  * This function only does something once when store->use_fallbacks == 1,
 631  * and then sets store->use_fallbacks = 0, so the second call and so on is
 632  * effectively a no-op.
 633  */
 634 static void provider_activate_fallbacks(struct provider_store_st *store)
 635 {
 636     if (store->use_fallbacks) {
 637         int num_provs = sk_OSSL_PROVIDER_num(store->providers);
 638         int activated_fallback_count = 0;
 639         int i;
 640
 641         for (i = 0; i < num_provs; i++) {
 642             OSSL_PROVIDER *prov = sk_OSSL_PROVIDER_value(store->providers, i);
 643
 644             /*
 645              * Note that we don't care if the activation succeeds or not.
 646              * If it doesn't succeed, then any attempt to use any of the
 647              * fallback providers will fail anyway.
 648              */
 649             if (prov->flag_fallback) {
 650                 activated_fallback_count++;
 651                 provider_activate(prov);
 652             }
 653         }
 654
 655         /*
 656          * We assume that all fallbacks have been added to the store before
 657          * any fallback is activated.
 658          * TODO: We may have to reconsider this, IF we find ourselves adding
 659          * fallbacks after any previous fallback has been activated.
 660          */
 661         if (activated_fallback_count > 0)
 662             store->use_fallbacks = 0;
 663     }
 664 }
 665
 666 int ossl_provider_forall_loaded(OPENSSL_CTX *ctx,
 667                                 int (*cb)(OSSL_PROVIDER *provider,
 668                                           void *cbdata),
 669                                 void *cbdata)
 670 {
 671     int ret = 1;
 672     struct provider_store_st *store = get_provider_store(ctx);
 673
 674 #ifndef FIPS_MODE
 675     /*
 676      * Make sure any providers are loaded from config before we try to use
 677      * them.
 678      */
 679     OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CONFIG, NULL);
 680 #endif
 681
 682     if (store != NULL) {
 683         CRYPTO_THREAD_read_lock(store->lock);
 684
 685         provider_activate_fallbacks(store);
 686
 687         /*
 688          * Now, we sweep through all providers
 689          */
 690         ret = provider_forall_loaded(store, NULL, cb, cbdata);
 691
 692         CRYPTO_THREAD_unlock(store->lock);
 693     }
 694
 695     return ret;
 696 }
 697
 698 int ossl_provider_available(OSSL_PROVIDER *prov)
 699 {
 700     if (prov != NULL) {
 701         CRYPTO_THREAD_read_lock(prov->store->lock);
 702         provider_activate_fallbacks(prov->store);
 703         CRYPTO_THREAD_unlock(prov->store->lock);
 704
 705         return prov->flag_initialized;
 706     }
 707     return 0;
 708 }
 709
 710 /* Setters of Provider Object data */
 711 int ossl_provider_set_fallback(OSSL_PROVIDER *prov)
 712 {
 713     if (prov == NULL)
 714         return 0;
 715
 716     prov->flag_fallback = 1;
 717     return 1;
 718 }
 719
 720 /* Getters of Provider Object data */
 721 const char *ossl_provider_name(const OSSL_PROVIDER *prov)
 722 {
 723     return prov->name;
 724 }
 725
 726 const DSO *ossl_provider_dso(const OSSL_PROVIDER *prov)
 727 {
 728     return prov->module;
 729 }
 730
 731 const char *ossl_provider_module_name(const OSSL_PROVIDER *prov)
 732 {
 733 #ifdef FIPS_MODE
 734     return NULL;
 735 #else
 736     return DSO_get_filename(prov->module);
 737 #endif
 738 }
 739
 740 const char *ossl_provider_module_path(const OSSL_PROVIDER *prov)
 741 {
 742 #ifdef FIPS_MODE
 743     return NULL;
 744 #else
 745     /* FIXME: Ensure it's a full path */
 746     return DSO_get_filename(prov->module);
 747 #endif
 748 }
 749
 750 OPENSSL_CTX *ossl_provider_library_context(const OSSL_PROVIDER *prov)
 751 {
 752     /* TODO(3.0) just: return prov->libctx; */
 753     return prov != NULL ? prov->libctx : NULL;
 754 }
 755
 756 /* Wrappers around calls to the provider */
 757 void ossl_provider_teardown(const OSSL_PROVIDER *prov)
 758 {
 759     if (prov->teardown != NULL)
 760         prov->teardown(prov->provctx);
 761 }
 762
 763 const OSSL_PARAM *ossl_provider_gettable_params(const OSSL_PROVIDER *prov)
 764 {
 765     return prov->gettable_params == NULL
 766         ? NULL : prov->gettable_params(prov->provctx);
 767 }
 768
 769 int ossl_provider_get_params(const OSSL_PROVIDER *prov, OSSL_PARAM params[])
 770 {
 771     return prov->get_params == NULL
 772         ? 0 : prov->get_params(prov->provctx, params);
 773 }
 774
 775
 776 const OSSL_ALGORITHM *ossl_provider_query_operation(const OSSL_PROVIDER *prov,
 777                                                     int operation_id,
 778                                                     int *no_cache)
 779 {
 780     return prov->query_operation(prov->provctx, operation_id, no_cache);
 781 }
 782
 783 /*-
 784  * Core functions for the provider
 785  * ===============================
 786  *
 787  * This is the set of functions that the core makes available to the provider
 788  */
 789
 790 /*
 791  * This returns a list of Provider Object parameters with their types, for
 792  * discovery.  We do not expect that many providers will use this, but one
 793  * never knows.
 794  */
 795 static const OSSL_PARAM param_types[] = {
 796     OSSL_PARAM_DEFN("openssl-version", OSSL_PARAM_UTF8_PTR, NULL, 0),
 797     OSSL_PARAM_DEFN("provider-name", OSSL_PARAM_UTF8_PTR, NULL, 0),
 798     OSSL_PARAM_END
 799 };
 800
 801 /*
 802  * Forward declare all the functions that are provided aa dispatch.
 803  * This ensures that the compiler will complain if they aren't defined
 804  * with the correct signature.
 805  */
 806 static OSSL_core_gettable_params_fn core_gettable_params;
 807 static OSSL_core_get_params_fn core_get_params;
 808 static OSSL_core_thread_start_fn core_thread_start;
 809 static OSSL_core_get_library_context_fn core_get_libctx;
 810 #ifndef FIPS_MODE
 811 static OSSL_core_new_error_fn core_new_error;
 812 static OSSL_core_set_error_debug_fn core_set_error_debug;
 813 static OSSL_core_vset_error_fn core_vset_error;
 814 static OSSL_core_set_error_mark_fn core_set_error_mark;
 815 static OSSL_core_clear_last_error_mark_fn core_clear_last_error_mark;
 816 static OSSL_core_pop_error_to_mark_fn core_pop_error_to_mark;
 817 #endif
 818
 819 static const OSSL_PARAM *core_gettable_params(const OSSL_PROVIDER *prov)
 820 {
 821     return param_types;
 822 }
 823
 824 static int core_get_params(const OSSL_PROVIDER *prov, OSSL_PARAM params[])
 825 {
 826     int i;
 827     OSSL_PARAM *p;
 828
 829     if ((p = OSSL_PARAM_locate(params, "openssl-version")) != NULL)
 830         OSSL_PARAM_set_utf8_ptr(p, OPENSSL_VERSION_STR);
 831     if ((p = OSSL_PARAM_locate(params, "provider-name")) != NULL)
 832         OSSL_PARAM_set_utf8_ptr(p, prov->name);
 833
 834 #ifndef FIPS_MODE
 835     if ((p = OSSL_PARAM_locate(params, OSSL_PROV_PARAM_MODULE_FILENAME)) != NULL)
 836         OSSL_PARAM_set_utf8_ptr(p, ossl_provider_module_path(prov));
 837 #endif
 838
 839     if (prov->parameters == NULL)
 840         return 1;
 841
 842     for (i = 0; i < sk_INFOPAIR_num(prov->parameters); i++) {
 843         INFOPAIR *pair = sk_INFOPAIR_value(prov->parameters, i);
 844
 845         if ((p = OSSL_PARAM_locate(params, pair->name)) != NULL)
 846             OSSL_PARAM_set_utf8_ptr(p, pair->value);
 847     }
 848     return 1;
 849 }
 850
 851 static OPENSSL_CTX *core_get_libctx(const OSSL_PROVIDER *prov)
 852 {
 853     return ossl_provider_library_context(prov);
 854 }
 855
 856 static int core_thread_start(const OSSL_PROVIDER *prov,
 857                              OSSL_thread_stop_handler_fn handfn)
 858 {
 859     return ossl_init_thread_start(prov, prov->provctx, handfn);
 860 }
 861
 862 /*
 863  * The FIPS module inner provider doesn't implement these.  They aren't
 864  * needed there, since the FIPS module upcalls are always the outer provider
 865  * ones.
 866  */
 867 #ifndef FIPS_MODE
 868 /*
 869  * TODO(3.0) These error functions should use |prov| to select the proper
 870  * library context to report in the correct error stack, at least if error
 871  * stacks become tied to the library context.
 872  * We cannot currently do that since there's no support for it in the
 873  * ERR subsystem.
 874  */
 875 static void core_new_error(const OSSL_PROVIDER *prov)
 876 {
 877     ERR_new();
 878 }
 879
 880 static void core_set_error_debug(const OSSL_PROVIDER *prov,
 881                                  const char *file, int line, const char *func)
 882 {
 883     ERR_set_debug(file, line, func);
 884 }
 885
 886 static void core_vset_error(const OSSL_PROVIDER *prov,
 887                             uint32_t reason, const char *fmt, va_list args)
 888 {
 889     /*
 890      * If the uppermost 8 bits are non-zero, it's an OpenSSL library
 891      * error and will be treated as such.  Otherwise, it's a new style
 892      * provider error and will be treated as such.
 893      */
 894     if (ERR_GET_LIB(reason) != 0) {
 895         ERR_vset_error(ERR_GET_LIB(reason), ERR_GET_REASON(reason), fmt, args);
 896     } else {
 897         ERR_vset_error(prov->error_lib, (int)reason, fmt, args);
 898     }
 899 }
 900
 901 static int core_set_error_mark(const OSSL_PROVIDER *prov)
 902 {
 903     return ERR_set_mark();
 904 }
 905
 906 static int core_clear_last_error_mark(const OSSL_PROVIDER *prov)
 907 {
 908     return ERR_clear_last_mark();
 909 }
 910
 911 static int core_pop_error_to_mark(const OSSL_PROVIDER *prov)
 912 {
 913     return ERR_pop_to_mark();
 914 }
 915 #endif /* FIPS_MODE */
 916
 917 /*
 918  * Functions provided by the core.  Blank line separates "families" of related
 919  * functions.
 920  */
 921 static const OSSL_DISPATCH core_dispatch_[] = {
 922     { OSSL_FUNC_CORE_GETTABLE_PARAMS, (void (*)(void))core_gettable_params },
 923     { OSSL_FUNC_CORE_GET_PARAMS, (void (*)(void))core_get_params },
 924     { OSSL_FUNC_CORE_GET_LIBRARY_CONTEXT, (void (*)(void))core_get_libctx },
 925     { OSSL_FUNC_CORE_THREAD_START, (void (*)(void))core_thread_start },
 926 #ifndef FIPS_MODE
 927     { OSSL_FUNC_CORE_NEW_ERROR, (void (*)(void))core_new_error },
 928     { OSSL_FUNC_CORE_SET_ERROR_DEBUG, (void (*)(void))core_set_error_debug },
 929     { OSSL_FUNC_CORE_VSET_ERROR, (void (*)(void))core_vset_error },
 930     { OSSL_FUNC_CORE_SET_ERROR_MARK, (void (*)(void))core_set_error_mark },
 931     { OSSL_FUNC_CORE_CLEAR_LAST_ERROR_MARK,
 932       (void (*)(void))core_clear_last_error_mark },
 933     { OSSL_FUNC_CORE_POP_ERROR_TO_MARK, (void (*)(void))core_pop_error_to_mark },
 934     { OSSL_FUNC_BIO_NEW_FILE, (void (*)(void))BIO_new_file },
 935     { OSSL_FUNC_BIO_NEW_MEMBUF, (void (*)(void))BIO_new_mem_buf },
 936     { OSSL_FUNC_BIO_READ_EX, (void (*)(void))BIO_read_ex },
 937     { OSSL_FUNC_BIO_FREE, (void (*)(void))BIO_free },
 938     { OSSL_FUNC_BIO_VPRINTF, (void (*)(void))BIO_vprintf },
 939     { OSSL_FUNC_BIO_VSNPRINTF, (void (*)(void))BIO_vsnprintf },
 940     { OSSL_FUNC_SELF_TEST_CB, (void (*)(void))OSSL_SELF_TEST_get_callback },
 941 #endif
 942     { OSSL_FUNC_CRYPTO_MALLOC, (void (*)(void))CRYPTO_malloc },
 943     { OSSL_FUNC_CRYPTO_ZALLOC, (void (*)(void))CRYPTO_zalloc },
 944     { OSSL_FUNC_CRYPTO_FREE, (void (*)(void))CRYPTO_free },
 945     { OSSL_FUNC_CRYPTO_CLEAR_FREE, (void (*)(void))CRYPTO_clear_free },
 946     { OSSL_FUNC_CRYPTO_REALLOC, (void (*)(void))CRYPTO_realloc },
 947     { OSSL_FUNC_CRYPTO_CLEAR_REALLOC, (void (*)(void))CRYPTO_clear_realloc },
 948     { OSSL_FUNC_CRYPTO_SECURE_MALLOC, (void (*)(void))CRYPTO_secure_malloc },
 949     { OSSL_FUNC_CRYPTO_SECURE_ZALLOC, (void (*)(void))CRYPTO_secure_zalloc },
 950     { OSSL_FUNC_CRYPTO_SECURE_FREE, (void (*)(void))CRYPTO_secure_free },
 951     { OSSL_FUNC_CRYPTO_SECURE_CLEAR_FREE,
 952         (void (*)(void))CRYPTO_secure_clear_free },
 953     { OSSL_FUNC_CRYPTO_SECURE_ALLOCATED,
 954         (void (*)(void))CRYPTO_secure_allocated },
 955     { OSSL_FUNC_OPENSSL_CLEANSE, (void (*)(void))OPENSSL_cleanse },
 956
 957     { 0, NULL }
 958 };
 959 static const OSSL_DISPATCH *core_dispatch = core_dispatch_;