crypto/evp/keymgmt_meth.c

   1 /*
   2  * Copyright 2019-2021 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/crypto.h>
  11 #include <openssl/core_dispatch.h>
  12 #include <openssl/evp.h>
  13 #include <openssl/err.h>
  14 #include "internal/provider.h"
  15 #include "internal/refcount.h"
  16 #include "crypto/evp.h"
  17 #include "evp_local.h"
  18
  19 static void *keymgmt_new(void)
  20 {
  21     EVP_KEYMGMT *keymgmt = NULL;
  22
  23     if ((keymgmt = OPENSSL_zalloc(sizeof(*keymgmt))) == NULL
  24         || (keymgmt->lock = CRYPTO_THREAD_lock_new()) == NULL) {
  25         EVP_KEYMGMT_free(keymgmt);
  26         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
  27         return NULL;
  28     }
  29
  30     keymgmt->refcnt = 1;
  31
  32     return keymgmt;
  33 }
  34
  35 static void *keymgmt_from_dispatch(int name_id,
  36                                    const OSSL_DISPATCH *fns,
  37                                    OSSL_PROVIDER *prov)
  38 {
  39     EVP_KEYMGMT *keymgmt = NULL;
  40     int setparamfncnt = 0, getparamfncnt = 0;
  41     int setgenparamfncnt = 0;
  42     int importfncnt = 0, exportfncnt = 0;
  43
  44     if ((keymgmt = keymgmt_new()) == NULL) {
  45         EVP_KEYMGMT_free(keymgmt);
  46         return NULL;
  47     }
  48     keymgmt->name_id = name_id;
  49
  50     for (; fns->function_id != 0; fns++) {
  51         switch (fns->function_id) {
  52         case OSSL_FUNC_KEYMGMT_NEW:
  53             if (keymgmt->new == NULL)
  54                 keymgmt->new = OSSL_FUNC_keymgmt_new(fns);
  55             break;
  56         case OSSL_FUNC_KEYMGMT_GEN_INIT:
  57             if (keymgmt->gen_init == NULL)
  58                 keymgmt->gen_init = OSSL_FUNC_keymgmt_gen_init(fns);
  59             break;
  60         case OSSL_FUNC_KEYMGMT_GEN_SET_TEMPLATE:
  61             if (keymgmt->gen_set_template == NULL)
  62                 keymgmt->gen_set_template =
  63                     OSSL_FUNC_keymgmt_gen_set_template(fns);
  64             break;
  65         case OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS:
  66             if (keymgmt->gen_set_params == NULL) {
  67                 setgenparamfncnt++;
  68                 keymgmt->gen_set_params =
  69                     OSSL_FUNC_keymgmt_gen_set_params(fns);
  70             }
  71             break;
  72         case OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS:
  73             if (keymgmt->gen_settable_params == NULL) {
  74                 setgenparamfncnt++;
  75                 keymgmt->gen_settable_params =
  76                     OSSL_FUNC_keymgmt_gen_settable_params(fns);
  77             }
  78             break;
  79         case OSSL_FUNC_KEYMGMT_GEN:
  80             if (keymgmt->gen == NULL)
  81                 keymgmt->gen = OSSL_FUNC_keymgmt_gen(fns);
  82             break;
  83         case OSSL_FUNC_KEYMGMT_GEN_CLEANUP:
  84             if (keymgmt->gen_cleanup == NULL)
  85                 keymgmt->gen_cleanup = OSSL_FUNC_keymgmt_gen_cleanup(fns);
  86             break;
  87         case OSSL_FUNC_KEYMGMT_FREE:
  88             if (keymgmt->free == NULL)
  89                 keymgmt->free = OSSL_FUNC_keymgmt_free(fns);
  90             break;
  91         case OSSL_FUNC_KEYMGMT_LOAD:
  92             if (keymgmt->load == NULL)
  93                 keymgmt->load = OSSL_FUNC_keymgmt_load(fns);
  94             break;
  95         case OSSL_FUNC_KEYMGMT_GET_PARAMS:
  96             if (keymgmt->get_params == NULL) {
  97                 getparamfncnt++;
  98                 keymgmt->get_params = OSSL_FUNC_keymgmt_get_params(fns);
  99             }
 100             break;
 101         case OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS:
 102             if (keymgmt->gettable_params == NULL) {
 103                 getparamfncnt++;
 104                 keymgmt->gettable_params =
 105                     OSSL_FUNC_keymgmt_gettable_params(fns);
 106             }
 107             break;
 108          case OSSL_FUNC_KEYMGMT_SET_PARAMS:
 109             if (keymgmt->set_params == NULL) {
 110                 setparamfncnt++;
 111                 keymgmt->set_params = OSSL_FUNC_keymgmt_set_params(fns);
 112             }
 113             break;
 114         case OSSL_FUNC_KEYMGMT_SETTABLE_PARAMS:
 115             if (keymgmt->settable_params == NULL) {
 116                 setparamfncnt++;
 117                 keymgmt->settable_params =
 118                     OSSL_FUNC_keymgmt_settable_params(fns);
 119             }
 120             break;
 121         case OSSL_FUNC_KEYMGMT_QUERY_OPERATION_NAME:
 122             if (keymgmt->query_operation_name == NULL)
 123                 keymgmt->query_operation_name =
 124                     OSSL_FUNC_keymgmt_query_operation_name(fns);
 125             break;
 126         case OSSL_FUNC_KEYMGMT_HAS:
 127             if (keymgmt->has == NULL)
 128                 keymgmt->has = OSSL_FUNC_keymgmt_has(fns);
 129             break;
 130         case OSSL_FUNC_KEYMGMT_COPY:
 131             if (keymgmt->copy == NULL)
 132                 keymgmt->copy = OSSL_FUNC_keymgmt_copy(fns);
 133             break;
 134         case OSSL_FUNC_KEYMGMT_VALIDATE:
 135             if (keymgmt->validate == NULL)
 136                 keymgmt->validate = OSSL_FUNC_keymgmt_validate(fns);
 137             break;
 138         case OSSL_FUNC_KEYMGMT_MATCH:
 139             if (keymgmt->match == NULL)
 140                 keymgmt->match = OSSL_FUNC_keymgmt_match(fns);
 141             break;
 142         case OSSL_FUNC_KEYMGMT_IMPORT:
 143             if (keymgmt->import == NULL) {
 144                 importfncnt++;
 145                 keymgmt->import = OSSL_FUNC_keymgmt_import(fns);
 146             }
 147             break;
 148         case OSSL_FUNC_KEYMGMT_IMPORT_TYPES:
 149             if (keymgmt->import_types == NULL) {
 150                 importfncnt++;
 151                 keymgmt->import_types = OSSL_FUNC_keymgmt_import_types(fns);
 152             }
 153             break;
 154         case OSSL_FUNC_KEYMGMT_EXPORT:
 155             if (keymgmt->export == NULL) {
 156                 exportfncnt++;
 157                 keymgmt->export = OSSL_FUNC_keymgmt_export(fns);
 158             }
 159             break;
 160         case OSSL_FUNC_KEYMGMT_EXPORT_TYPES:
 161             if (keymgmt->export_types == NULL) {
 162                 exportfncnt++;
 163                 keymgmt->export_types = OSSL_FUNC_keymgmt_export_types(fns);
 164             }
 165             break;
 166         }
 167     }
 168     /*
 169      * Try to check that the method is sensible.
 170      * At least one constructor and the destructor are MANDATORY
 171      * The functions 'has' is MANDATORY
 172      * It makes no sense being able to free stuff if you can't create it.
 173      * It makes no sense providing OSSL_PARAM descriptors for import and
 174      * export if you can't import or export.
 175      */
 176     if (keymgmt->free == NULL
 177         || (keymgmt->new == NULL
 178             && keymgmt->gen == NULL
 179             && keymgmt->load == NULL)
 180         || keymgmt->has == NULL
 181         || (getparamfncnt != 0 && getparamfncnt != 2)
 182         || (setparamfncnt != 0 && setparamfncnt != 2)
 183         || (setgenparamfncnt != 0 && setgenparamfncnt != 2)
 184         || (importfncnt != 0 && importfncnt != 2)
 185         || (exportfncnt != 0 && exportfncnt != 2)
 186         || (keymgmt->gen != NULL
 187             && (keymgmt->gen_init == NULL
 188                 || keymgmt->gen_cleanup == NULL))) {
 189         EVP_KEYMGMT_free(keymgmt);
 190         ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
 191         return NULL;
 192     }
 193     keymgmt->prov = prov;
 194     if (prov != NULL)
 195         ossl_provider_up_ref(prov);
 196
 197     return keymgmt;
 198 }
 199
 200 EVP_KEYMGMT *evp_keymgmt_fetch_by_number(OSSL_LIB_CTX *ctx, int name_id,
 201                                          const char *properties)
 202 {
 203     return evp_generic_fetch_by_number(ctx,
 204                                        OSSL_OP_KEYMGMT, name_id, properties,
 205                                        keymgmt_from_dispatch,
 206                                        (int (*)(void *))EVP_KEYMGMT_up_ref,
 207                                        (void (*)(void *))EVP_KEYMGMT_free);
 208 }
 209
 210 EVP_KEYMGMT *EVP_KEYMGMT_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
 211                                const char *properties)
 212 {
 213     return evp_generic_fetch(ctx, OSSL_OP_KEYMGMT, algorithm, properties,
 214                              keymgmt_from_dispatch,
 215                              (int (*)(void *))EVP_KEYMGMT_up_ref,
 216                              (void (*)(void *))EVP_KEYMGMT_free);
 217 }
 218
 219 int EVP_KEYMGMT_up_ref(EVP_KEYMGMT *keymgmt)
 220 {
 221     int ref = 0;
 222
 223     CRYPTO_UP_REF(&keymgmt->refcnt, &ref, keymgmt->lock);
 224     return 1;
 225 }
 226
 227 void EVP_KEYMGMT_free(EVP_KEYMGMT *keymgmt)
 228 {
 229     int ref = 0;
 230
 231     if (keymgmt == NULL)
 232         return;
 233
 234     CRYPTO_DOWN_REF(&keymgmt->refcnt, &ref, keymgmt->lock);
 235     if (ref > 0)
 236         return;
 237     ossl_provider_free(keymgmt->prov);
 238     CRYPTO_THREAD_lock_free(keymgmt->lock);
 239     OPENSSL_free(keymgmt);
 240 }
 241
 242 const OSSL_PROVIDER *EVP_KEYMGMT_provider(const EVP_KEYMGMT *keymgmt)
 243 {
 244     return keymgmt->prov;
 245 }
 246
 247 int EVP_KEYMGMT_number(const EVP_KEYMGMT *keymgmt)
 248 {
 249     return keymgmt->name_id;
 250 }
 251
 252 const char *EVP_KEYMGMT_get0_first_name(const EVP_KEYMGMT *keymgmt)
 253 {
 254     return evp_first_name(keymgmt->prov, keymgmt->name_id);
 255 }
 256
 257 int EVP_KEYMGMT_is_a(const EVP_KEYMGMT *keymgmt, const char *name)
 258 {
 259     return evp_is_a(keymgmt->prov, keymgmt->name_id, NULL, name);
 260 }
 261
 262 void EVP_KEYMGMT_do_all_provided(OSSL_LIB_CTX *libctx,
 263                                  void (*fn)(EVP_KEYMGMT *keymgmt, void *arg),
 264                                  void *arg)
 265 {
 266     evp_generic_do_all(libctx, OSSL_OP_KEYMGMT,
 267                        (void (*)(void *, void *))fn, arg,
 268                        keymgmt_from_dispatch,
 269                        (void (*)(void *))EVP_KEYMGMT_free);
 270 }
 271
 272 int EVP_KEYMGMT_names_do_all(const EVP_KEYMGMT *keymgmt,
 273                              void (*fn)(const char *name, void *data),
 274                              void *data)
 275 {
 276     if (keymgmt->prov != NULL)
 277         return evp_names_do_all(keymgmt->prov, keymgmt->name_id, fn, data);
 278
 279     return 1;
 280 }
 281
 282 /*
 283  * Internal API that interfaces with the method function pointers
 284  */
 285 void *evp_keymgmt_newdata(const EVP_KEYMGMT *keymgmt)
 286 {
 287     void *provctx = ossl_provider_ctx(EVP_KEYMGMT_provider(keymgmt));
 288
 289     /*
 290      * TODO(3.0) 'new' is currently mandatory on its own, but when new
 291      * constructors appear, it won't be quite as mandatory, so we have
 292      * a check for future cases.
 293      */
 294     if (keymgmt->new == NULL)
 295         return NULL;
 296     return keymgmt->new(provctx);
 297 }
 298
 299 void evp_keymgmt_freedata(const EVP_KEYMGMT *keymgmt, void *keydata)
 300 {
 301     /* This is mandatory, no need to check for its presence */
 302     keymgmt->free(keydata);
 303 }
 304
 305 void *evp_keymgmt_gen_init(const EVP_KEYMGMT *keymgmt, int selection)
 306 {
 307     void *provctx = ossl_provider_ctx(EVP_KEYMGMT_provider(keymgmt));
 308
 309     if (keymgmt->gen_init == NULL)
 310         return NULL;
 311     return keymgmt->gen_init(provctx, selection);
 312 }
 313
 314 int evp_keymgmt_gen_set_template(const EVP_KEYMGMT *keymgmt, void *genctx,
 315                                  void *template)
 316 {
 317     /*
 318      * It's arguable if we actually should return success in this case, as
 319      * it allows the caller to set a template key, which is then ignored.
 320      * However, this is how the legacy methods (EVP_PKEY_METHOD) operate,
 321      * so we do this in the interest of backward compatibility.
 322      * TODO(3.0) Investigate if we should change this behaviour.
 323      */
 324     if (keymgmt->gen_set_template == NULL)
 325         return 1;
 326     return keymgmt->gen_set_template(genctx, template);
 327 }
 328
 329 int evp_keymgmt_gen_set_params(const EVP_KEYMGMT *keymgmt, void *genctx,
 330                                const OSSL_PARAM params[])
 331 {
 332     if (keymgmt->gen_set_params == NULL)
 333         return 0;
 334     return keymgmt->gen_set_params(genctx, params);
 335 }
 336
 337 const OSSL_PARAM *EVP_KEYMGMT_gen_settable_params(const EVP_KEYMGMT *keymgmt)
 338 {
 339     void *provctx = ossl_provider_ctx(EVP_KEYMGMT_provider(keymgmt));
 340
 341     if (keymgmt->gen_settable_params == NULL)
 342         return NULL;
 343     return keymgmt->gen_settable_params(provctx);
 344 }
 345
 346 void *evp_keymgmt_gen(const EVP_KEYMGMT *keymgmt, void *genctx,
 347                       OSSL_CALLBACK *cb, void *cbarg)
 348 {
 349     if (keymgmt->gen == NULL)
 350         return NULL;
 351     return keymgmt->gen(genctx, cb, cbarg);
 352 }
 353
 354 void evp_keymgmt_gen_cleanup(const EVP_KEYMGMT *keymgmt, void *genctx)
 355 {
 356     if (keymgmt->gen != NULL)
 357         keymgmt->gen_cleanup(genctx);
 358 }
 359
 360 void *evp_keymgmt_load(const EVP_KEYMGMT *keymgmt,
 361                        const void *objref, size_t objref_sz)
 362 {
 363     if (keymgmt->load != NULL)
 364         return keymgmt->load(objref, objref_sz);
 365     return NULL;
 366 }
 367
 368 int evp_keymgmt_get_params(const EVP_KEYMGMT *keymgmt, void *keydata,
 369                            OSSL_PARAM params[])
 370 {
 371     if (keymgmt->get_params == NULL)
 372         return 1;
 373     return keymgmt->get_params(keydata, params);
 374 }
 375
 376 const OSSL_PARAM *EVP_KEYMGMT_gettable_params(const EVP_KEYMGMT *keymgmt)
 377 {
 378     void *provctx = ossl_provider_ctx(EVP_KEYMGMT_provider(keymgmt));
 379
 380     if (keymgmt->gettable_params == NULL)
 381         return NULL;
 382     return keymgmt->gettable_params(provctx);
 383 }
 384
 385 int evp_keymgmt_set_params(const EVP_KEYMGMT *keymgmt, void *keydata,
 386                            const OSSL_PARAM params[])
 387 {
 388     if (keymgmt->set_params == NULL)
 389         return 1;
 390     return keymgmt->set_params(keydata, params);
 391 }
 392
 393 const OSSL_PARAM *EVP_KEYMGMT_settable_params(const EVP_KEYMGMT *keymgmt)
 394 {
 395     void *provctx = ossl_provider_ctx(EVP_KEYMGMT_provider(keymgmt));
 396
 397     if (keymgmt->settable_params == NULL)
 398         return NULL;
 399     return keymgmt->settable_params(provctx);
 400 }
 401
 402 int evp_keymgmt_has(const EVP_KEYMGMT *keymgmt, void *keydata, int selection)
 403 {
 404     /* This is mandatory, no need to check for its presence */
 405     return keymgmt->has(keydata, selection);
 406 }
 407
 408 int evp_keymgmt_validate(const EVP_KEYMGMT *keymgmt, void *keydata,
 409                          int selection, int checktype)
 410 {
 411     /* We assume valid if the implementation doesn't have a function */
 412     if (keymgmt->validate == NULL)
 413         return 1;
 414     return keymgmt->validate(keydata, selection, checktype);
 415 }
 416
 417 int evp_keymgmt_match(const EVP_KEYMGMT *keymgmt,
 418                       const void *keydata1, const void *keydata2,
 419                       int selection)
 420 {
 421     /* We assume no match if the implementation doesn't have a function */
 422     if (keymgmt->match == NULL)
 423         return 0;
 424     return keymgmt->match(keydata1, keydata2, selection);
 425 }
 426
 427 int evp_keymgmt_import(const EVP_KEYMGMT *keymgmt, void *keydata,
 428                        int selection, const OSSL_PARAM params[])
 429 {
 430     if (keymgmt->import == NULL)
 431         return 0;
 432     return keymgmt->import(keydata, selection, params);
 433 }
 434
 435 const OSSL_PARAM *evp_keymgmt_import_types(const EVP_KEYMGMT *keymgmt,
 436                                            int selection)
 437 {
 438     if (keymgmt->import_types == NULL)
 439         return NULL;
 440     return keymgmt->import_types(selection);
 441 }
 442
 443 int evp_keymgmt_export(const EVP_KEYMGMT *keymgmt, void *keydata,
 444                        int selection, OSSL_CALLBACK *param_cb, void *cbarg)
 445 {
 446     if (keymgmt->export == NULL)
 447         return 0;
 448     return keymgmt->export(keydata, selection, param_cb, cbarg);
 449 }
 450
 451 const OSSL_PARAM *evp_keymgmt_export_types(const EVP_KEYMGMT *keymgmt,
 452                                            int selection)
 453 {
 454     if (keymgmt->export_types == NULL)
 455         return NULL;
 456     return keymgmt->export_types(selection);
 457 }
 458
 459 int evp_keymgmt_copy(const EVP_KEYMGMT *keymgmt,
 460                      void *keydata_to, const void *keydata_from,
 461                      int selection)
 462 {
 463     /* We assume no copy if the implementation doesn't have a function */
 464     if (keymgmt->copy == NULL)
 465         return 0;
 466     return keymgmt->copy(keydata_to, keydata_from, selection);
 467 }