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 void 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         evp_names_do_all(keymgmt->prov, keymgmt->name_id, fn, data);
 278 }
 279
 280 /*
 281  * Internal API that interfaces with the method function pointers
 282  */
 283 void *evp_keymgmt_newdata(const EVP_KEYMGMT *keymgmt)
 284 {
 285     void *provctx = ossl_provider_ctx(EVP_KEYMGMT_provider(keymgmt));
 286
 287     /*
 288      * TODO(3.0) 'new' is currently mandatory on its own, but when new
 289      * constructors appear, it won't be quite as mandatory, so we have
 290      * a check for future cases.
 291      */
 292     if (keymgmt->new == NULL)
 293         return NULL;
 294     return keymgmt->new(provctx);
 295 }
 296
 297 void evp_keymgmt_freedata(const EVP_KEYMGMT *keymgmt, void *keydata)
 298 {
 299     /* This is mandatory, no need to check for its presence */
 300     keymgmt->free(keydata);
 301 }
 302
 303 void *evp_keymgmt_gen_init(const EVP_KEYMGMT *keymgmt, int selection)
 304 {
 305     void *provctx = ossl_provider_ctx(EVP_KEYMGMT_provider(keymgmt));
 306
 307     if (keymgmt->gen_init == NULL)
 308         return NULL;
 309     return keymgmt->gen_init(provctx, selection);
 310 }
 311
 312 int evp_keymgmt_gen_set_template(const EVP_KEYMGMT *keymgmt, void *genctx,
 313                                  void *template)
 314 {
 315     /*
 316      * It's arguable if we actually should return success in this case, as
 317      * it allows the caller to set a template key, which is then ignored.
 318      * However, this is how the legacy methods (EVP_PKEY_METHOD) operate,
 319      * so we do this in the interest of backward compatibility.
 320      * TODO(3.0) Investigate if we should change this behaviour.
 321      */
 322     if (keymgmt->gen_set_template == NULL)
 323         return 1;
 324     return keymgmt->gen_set_template(genctx, template);
 325 }
 326
 327 int evp_keymgmt_gen_set_params(const EVP_KEYMGMT *keymgmt, void *genctx,
 328                                const OSSL_PARAM params[])
 329 {
 330     if (keymgmt->gen_set_params == NULL)
 331         return 0;
 332     return keymgmt->gen_set_params(genctx, params);
 333 }
 334
 335 const OSSL_PARAM *EVP_KEYMGMT_gen_settable_params(const EVP_KEYMGMT *keymgmt)
 336 {
 337     void *provctx = ossl_provider_ctx(EVP_KEYMGMT_provider(keymgmt));
 338
 339     if (keymgmt->gen_settable_params == NULL)
 340         return NULL;
 341     return keymgmt->gen_settable_params(provctx);
 342 }
 343
 344 void *evp_keymgmt_gen(const EVP_KEYMGMT *keymgmt, void *genctx,
 345                       OSSL_CALLBACK *cb, void *cbarg)
 346 {
 347     if (keymgmt->gen == NULL)
 348         return NULL;
 349     return keymgmt->gen(genctx, cb, cbarg);
 350 }
 351
 352 void evp_keymgmt_gen_cleanup(const EVP_KEYMGMT *keymgmt, void *genctx)
 353 {
 354     if (keymgmt->gen != NULL)
 355         keymgmt->gen_cleanup(genctx);
 356 }
 357
 358 void *evp_keymgmt_load(const EVP_KEYMGMT *keymgmt,
 359                        const void *objref, size_t objref_sz)
 360 {
 361     if (keymgmt->load != NULL)
 362         return keymgmt->load(objref, objref_sz);
 363     return NULL;
 364 }
 365
 366 int evp_keymgmt_get_params(const EVP_KEYMGMT *keymgmt, void *keydata,
 367                            OSSL_PARAM params[])
 368 {
 369     if (keymgmt->get_params == NULL)
 370         return 1;
 371     return keymgmt->get_params(keydata, params);
 372 }
 373
 374 const OSSL_PARAM *EVP_KEYMGMT_gettable_params(const EVP_KEYMGMT *keymgmt)
 375 {
 376     void *provctx = ossl_provider_ctx(EVP_KEYMGMT_provider(keymgmt));
 377
 378     if (keymgmt->gettable_params == NULL)
 379         return NULL;
 380     return keymgmt->gettable_params(provctx);
 381 }
 382
 383 int evp_keymgmt_set_params(const EVP_KEYMGMT *keymgmt, void *keydata,
 384                            const OSSL_PARAM params[])
 385 {
 386     if (keymgmt->set_params == NULL)
 387         return 1;
 388     return keymgmt->set_params(keydata, params);
 389 }
 390
 391 const OSSL_PARAM *EVP_KEYMGMT_settable_params(const EVP_KEYMGMT *keymgmt)
 392 {
 393     void *provctx = ossl_provider_ctx(EVP_KEYMGMT_provider(keymgmt));
 394
 395     if (keymgmt->settable_params == NULL)
 396         return NULL;
 397     return keymgmt->settable_params(provctx);
 398 }
 399
 400 int evp_keymgmt_has(const EVP_KEYMGMT *keymgmt, void *keydata, int selection)
 401 {
 402     /* This is mandatory, no need to check for its presence */
 403     return keymgmt->has(keydata, selection);
 404 }
 405
 406 int evp_keymgmt_validate(const EVP_KEYMGMT *keymgmt, void *keydata,
 407                          int selection, int checktype)
 408 {
 409     /* We assume valid if the implementation doesn't have a function */
 410     if (keymgmt->validate == NULL)
 411         return 1;
 412     return keymgmt->validate(keydata, selection, checktype);
 413 }
 414
 415 int evp_keymgmt_match(const EVP_KEYMGMT *keymgmt,
 416                       const void *keydata1, const void *keydata2,
 417                       int selection)
 418 {
 419     /* We assume no match if the implementation doesn't have a function */
 420     if (keymgmt->match == NULL)
 421         return 0;
 422     return keymgmt->match(keydata1, keydata2, selection);
 423 }
 424
 425 int evp_keymgmt_import(const EVP_KEYMGMT *keymgmt, void *keydata,
 426                        int selection, const OSSL_PARAM params[])
 427 {
 428     if (keymgmt->import == NULL)
 429         return 0;
 430     return keymgmt->import(keydata, selection, params);
 431 }
 432
 433 const OSSL_PARAM *evp_keymgmt_import_types(const EVP_KEYMGMT *keymgmt,
 434                                            int selection)
 435 {
 436     if (keymgmt->import_types == NULL)
 437         return NULL;
 438     return keymgmt->import_types(selection);
 439 }
 440
 441 int evp_keymgmt_export(const EVP_KEYMGMT *keymgmt, void *keydata,
 442                        int selection, OSSL_CALLBACK *param_cb, void *cbarg)
 443 {
 444     if (keymgmt->export == NULL)
 445         return 0;
 446     return keymgmt->export(keydata, selection, param_cb, cbarg);
 447 }
 448
 449 const OSSL_PARAM *evp_keymgmt_export_types(const EVP_KEYMGMT *keymgmt,
 450                                            int selection)
 451 {
 452     if (keymgmt->export_types == NULL)
 453         return NULL;
 454     return keymgmt->export_types(selection);
 455 }
 456
 457 int evp_keymgmt_copy(const EVP_KEYMGMT *keymgmt,
 458                      void *keydata_to, const void *keydata_from,
 459                      int selection)
 460 {
 461     /* We assume no copy if the implementation doesn't have a function */
 462     if (keymgmt->copy == NULL)
 463         return 0;
 464     return keymgmt->copy(keydata_to, keydata_from, selection);
 465 }