crypto/evp/asymcipher.c

   1 /*
   2  * Copyright 2006-2020 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 <stdio.h>
  11 #include <stdlib.h>
  12 #include <openssl/objects.h>
  13 #include <openssl/evp.h>
  14 #include "internal/cryptlib.h"
  15 #include "crypto/evp.h"
  16 #include "internal/provider.h"
  17 #include "evp_local.h"
  18
  19 static int evp_pkey_asym_cipher_init(EVP_PKEY_CTX *ctx, int operation)
  20 {
  21     int ret = 0;
  22     void *provkey = NULL;
  23     EVP_ASYM_CIPHER *cipher = NULL;
  24     EVP_KEYMGMT *tmp_keymgmt = NULL;
  25     const char *supported_ciph = NULL;
  26
  27     if (ctx == NULL) {
  28         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
  29         return -2;
  30     }
  31
  32     evp_pkey_ctx_free_old_ops(ctx);
  33     ctx->operation = operation;
  34
  35     /*
  36      * TODO when we stop falling back to legacy, this and the ERR_pop_to_mark()
  37      * calls can be removed.
  38      */
  39     ERR_set_mark();
  40
  41     if (evp_pkey_ctx_is_legacy(ctx))
  42         goto legacy;
  43
  44     /*
  45      * Ensure that the key is provided, either natively, or as a cached export.
  46      *  If not, go legacy
  47      */
  48     tmp_keymgmt = ctx->keymgmt;
  49     provkey = evp_pkey_export_to_provider(ctx->pkey, ctx->libctx,
  50                                           &tmp_keymgmt, ctx->propquery);
  51     if (provkey == NULL)
  52         goto legacy;
  53     if (!EVP_KEYMGMT_up_ref(tmp_keymgmt)) {
  54         ERR_clear_last_mark();
  55         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
  56         goto err;
  57     }
  58     EVP_KEYMGMT_free(ctx->keymgmt);
  59     ctx->keymgmt = tmp_keymgmt;
  60
  61     if (ctx->keymgmt->query_operation_name != NULL)
  62         supported_ciph =
  63             ctx->keymgmt->query_operation_name(OSSL_OP_ASYM_CIPHER);
  64
  65     /*
  66      * If we didn't get a supported ciph, assume there is one with the
  67      * same name as the key type.
  68      */
  69     if (supported_ciph == NULL)
  70         supported_ciph = ctx->keytype;
  71
  72     /*
  73      * Because we cleared out old ops, we shouldn't need to worry about
  74      * checking if cipher is already there.
  75      */
  76     cipher =
  77         EVP_ASYM_CIPHER_fetch(ctx->libctx, supported_ciph, ctx->propquery);
  78
  79     if (cipher == NULL
  80         || (EVP_KEYMGMT_provider(ctx->keymgmt)
  81             != EVP_ASYM_CIPHER_provider(cipher))) {
  82         /*
  83          * We don't need to free ctx->keymgmt here, as it's not necessarily
  84          * tied to this operation.  It will be freed by EVP_PKEY_CTX_free().
  85          */
  86         EVP_ASYM_CIPHER_free(cipher);
  87         goto legacy;
  88     }
  89
  90     /*
  91      * TODO remove this when legacy is gone
  92      * If we don't have the full support we need with provided methods,
  93      * let's go see if legacy does.
  94      */
  95     ERR_pop_to_mark();
  96
  97     /* No more legacy from here down to legacy: */
  98
  99     ctx->op.ciph.cipher = cipher;
 100     ctx->op.ciph.ciphprovctx = cipher->newctx(ossl_provider_ctx(cipher->prov));
 101     if (ctx->op.ciph.ciphprovctx == NULL) {
 102         /* The provider key can stay in the cache */
 103         EVPerr(0, EVP_R_INITIALIZATION_ERROR);
 104         goto err;
 105     }
 106
 107     switch (operation) {
 108     case EVP_PKEY_OP_ENCRYPT:
 109         if (cipher->encrypt_init == NULL) {
 110             EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 111             ret = -2;
 112             goto err;
 113         }
 114         ret = cipher->encrypt_init(ctx->op.ciph.ciphprovctx, provkey);
 115         break;
 116     case EVP_PKEY_OP_DECRYPT:
 117         if (cipher->decrypt_init == NULL) {
 118             EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 119             ret = -2;
 120             goto err;
 121         }
 122         ret = cipher->decrypt_init(ctx->op.ciph.ciphprovctx, provkey);
 123         break;
 124     default:
 125         EVPerr(0, EVP_R_INITIALIZATION_ERROR);
 126         goto err;
 127     }
 128
 129     if (ret <= 0)
 130         goto err;
 131     return 1;
 132
 133  legacy:
 134     /*
 135      * TODO remove this when legacy is gone
 136      * If we don't have the full support we need with provided methods,
 137      * let's go see if legacy does.
 138      */
 139     ERR_pop_to_mark();
 140
 141     if (ctx->pmeth == NULL || ctx->pmeth->encrypt == NULL) {
 142         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 143         return -2;
 144     }
 145     switch(ctx->operation) {
 146     case EVP_PKEY_OP_ENCRYPT:
 147         if (ctx->pmeth->encrypt_init == NULL)
 148             return 1;
 149         ret = ctx->pmeth->encrypt_init(ctx);
 150         break;
 151     case EVP_PKEY_OP_DECRYPT:
 152         if (ctx->pmeth->decrypt_init == NULL)
 153             return 1;
 154         ret = ctx->pmeth->decrypt_init(ctx);
 155         break;
 156     default:
 157         EVPerr(0, EVP_R_INITIALIZATION_ERROR);
 158         ret = -1;
 159     }
 160
 161  err:
 162     if (ret <= 0) {
 163         evp_pkey_ctx_free_old_ops(ctx);
 164         ctx->operation = EVP_PKEY_OP_UNDEFINED;
 165     }
 166     return ret;
 167 }
 168
 169 int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx)
 170 {
 171     return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_ENCRYPT);
 172 }
 173
 174 int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx,
 175                      unsigned char *out, size_t *outlen,
 176                      const unsigned char *in, size_t inlen)
 177 {
 178     int ret;
 179
 180     if (ctx == NULL) {
 181         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 182         return -2;
 183     }
 184
 185     if (ctx->operation != EVP_PKEY_OP_ENCRYPT) {
 186         EVPerr(0, EVP_R_OPERATON_NOT_INITIALIZED);
 187         return -1;
 188     }
 189
 190     if (ctx->op.ciph.ciphprovctx == NULL)
 191         goto legacy;
 192
 193     ret = ctx->op.ciph.cipher->encrypt(ctx->op.ciph.ciphprovctx, out, outlen,
 194                                        (out == NULL ? 0 : *outlen), in, inlen);
 195     return ret;
 196
 197  legacy:
 198     if (ctx->pmeth == NULL || ctx->pmeth->encrypt == NULL) {
 199         EVPerr(EVP_F_EVP_PKEY_ENCRYPT,
 200                EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 201         return -2;
 202     }
 203     M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_ENCRYPT)
 204         return ctx->pmeth->encrypt(ctx, out, outlen, in, inlen);
 205 }
 206
 207 int EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx)
 208 {
 209     return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_DECRYPT);
 210 }
 211
 212 int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx,
 213                      unsigned char *out, size_t *outlen,
 214                      const unsigned char *in, size_t inlen)
 215 {
 216     int ret;
 217
 218     if (ctx == NULL) {
 219         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 220         return -2;
 221     }
 222
 223     if (ctx->operation != EVP_PKEY_OP_DECRYPT) {
 224         EVPerr(0, EVP_R_OPERATON_NOT_INITIALIZED);
 225         return -1;
 226     }
 227
 228     if (ctx->op.ciph.ciphprovctx == NULL)
 229         goto legacy;
 230
 231     ret = ctx->op.ciph.cipher->decrypt(ctx->op.ciph.ciphprovctx, out, outlen,
 232                                        (out == NULL ? 0 : *outlen), in, inlen);
 233     return ret;
 234
 235  legacy:
 236     if (ctx->pmeth == NULL || ctx->pmeth->decrypt == NULL) {
 237         EVPerr(EVP_F_EVP_PKEY_DECRYPT,
 238                EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 239         return -2;
 240     }
 241     M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_DECRYPT)
 242         return ctx->pmeth->decrypt(ctx, out, outlen, in, inlen);
 243 }
 244
 245
 246 static EVP_ASYM_CIPHER *evp_asym_cipher_new(OSSL_PROVIDER *prov)
 247 {
 248     EVP_ASYM_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_ASYM_CIPHER));
 249
 250     if (cipher == NULL) {
 251         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
 252         return NULL;
 253     }
 254
 255     cipher->lock = CRYPTO_THREAD_lock_new();
 256     if (cipher->lock == NULL) {
 257         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
 258         OPENSSL_free(cipher);
 259         return NULL;
 260     }
 261     cipher->prov = prov;
 262     ossl_provider_up_ref(prov);
 263     cipher->refcnt = 1;
 264
 265     return cipher;
 266 }
 267
 268 static void *evp_asym_cipher_from_dispatch(int name_id,
 269                                            const OSSL_DISPATCH *fns,
 270                                            OSSL_PROVIDER *prov)
 271 {
 272     EVP_ASYM_CIPHER *cipher = NULL;
 273     int ctxfncnt = 0, encfncnt = 0, decfncnt = 0;
 274     int gparamfncnt = 0, sparamfncnt = 0;
 275
 276     if ((cipher = evp_asym_cipher_new(prov)) == NULL) {
 277         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
 278         goto err;
 279     }
 280
 281     cipher->name_id = name_id;
 282
 283     for (; fns->function_id != 0; fns++) {
 284         switch (fns->function_id) {
 285         case OSSL_FUNC_ASYM_CIPHER_NEWCTX:
 286             if (cipher->newctx != NULL)
 287                 break;
 288             cipher->newctx = OSSL_FUNC_asym_cipher_newctx(fns);
 289             ctxfncnt++;
 290             break;
 291         case OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT:
 292             if (cipher->encrypt_init != NULL)
 293                 break;
 294             cipher->encrypt_init = OSSL_FUNC_asym_cipher_encrypt_init(fns);
 295             encfncnt++;
 296             break;
 297         case OSSL_FUNC_ASYM_CIPHER_ENCRYPT:
 298             if (cipher->encrypt != NULL)
 299                 break;
 300             cipher->encrypt = OSSL_FUNC_asym_cipher_encrypt(fns);
 301             encfncnt++;
 302             break;
 303         case OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT:
 304             if (cipher->decrypt_init != NULL)
 305                 break;
 306             cipher->decrypt_init = OSSL_FUNC_asym_cipher_decrypt_init(fns);
 307             decfncnt++;
 308             break;
 309         case OSSL_FUNC_ASYM_CIPHER_DECRYPT:
 310             if (cipher->decrypt != NULL)
 311                 break;
 312             cipher->decrypt = OSSL_FUNC_asym_cipher_decrypt(fns);
 313             decfncnt++;
 314             break;
 315         case OSSL_FUNC_ASYM_CIPHER_FREECTX:
 316             if (cipher->freectx != NULL)
 317                 break;
 318             cipher->freectx = OSSL_FUNC_asym_cipher_freectx(fns);
 319             ctxfncnt++;
 320             break;
 321         case OSSL_FUNC_ASYM_CIPHER_DUPCTX:
 322             if (cipher->dupctx != NULL)
 323                 break;
 324             cipher->dupctx = OSSL_FUNC_asym_cipher_dupctx(fns);
 325             break;
 326         case OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS:
 327             if (cipher->get_ctx_params != NULL)
 328                 break;
 329             cipher->get_ctx_params
 330                 = OSSL_FUNC_asym_cipher_get_ctx_params(fns);
 331             gparamfncnt++;
 332             break;
 333         case OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS:
 334             if (cipher->gettable_ctx_params != NULL)
 335                 break;
 336             cipher->gettable_ctx_params
 337                 = OSSL_FUNC_asym_cipher_gettable_ctx_params(fns);
 338             gparamfncnt++;
 339             break;
 340         case OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS:
 341             if (cipher->set_ctx_params != NULL)
 342                 break;
 343             cipher->set_ctx_params
 344                 = OSSL_FUNC_asym_cipher_set_ctx_params(fns);
 345             sparamfncnt++;
 346             break;
 347         case OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS:
 348             if (cipher->settable_ctx_params != NULL)
 349                 break;
 350             cipher->settable_ctx_params
 351                 = OSSL_FUNC_asym_cipher_settable_ctx_params(fns);
 352             sparamfncnt++;
 353             break;
 354         }
 355     }
 356     if (ctxfncnt != 2
 357         || (encfncnt != 0 && encfncnt != 2)
 358         || (decfncnt != 0 && decfncnt != 2)
 359         || (encfncnt != 2 && decfncnt != 2)
 360         || (gparamfncnt != 0 && gparamfncnt != 2)
 361         || (sparamfncnt != 0 && sparamfncnt != 2)) {
 362         /*
 363          * In order to be a consistent set of functions we must have at least
 364          * a set of context functions (newctx and freectx) as well as a pair of
 365          * "cipher" functions: (encrypt_init, encrypt) or
 366          * (decrypt_init decrypt). set_ctx_params and settable_ctx_params are
 367          * optional, but if one of them is present then the other one must also
 368          * be present. The same applies to get_ctx_params and
 369          * gettable_ctx_params. The dupctx function is optional.
 370          */
 371         ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
 372         goto err;
 373     }
 374
 375     return cipher;
 376  err:
 377     EVP_ASYM_CIPHER_free(cipher);
 378     return NULL;
 379 }
 380
 381 void EVP_ASYM_CIPHER_free(EVP_ASYM_CIPHER *cipher)
 382 {
 383     if (cipher != NULL) {
 384         int i;
 385
 386         CRYPTO_DOWN_REF(&cipher->refcnt, &i, cipher->lock);
 387         if (i > 0)
 388             return;
 389         ossl_provider_free(cipher->prov);
 390         CRYPTO_THREAD_lock_free(cipher->lock);
 391         OPENSSL_free(cipher);
 392     }
 393 }
 394
 395 int EVP_ASYM_CIPHER_up_ref(EVP_ASYM_CIPHER *cipher)
 396 {
 397     int ref = 0;
 398
 399     CRYPTO_UP_REF(&cipher->refcnt, &ref, cipher->lock);
 400     return 1;
 401 }
 402
 403 OSSL_PROVIDER *EVP_ASYM_CIPHER_provider(const EVP_ASYM_CIPHER *cipher)
 404 {
 405     return cipher->prov;
 406 }
 407
 408 EVP_ASYM_CIPHER *EVP_ASYM_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
 409                                        const char *properties)
 410 {
 411     return evp_generic_fetch(ctx, OSSL_OP_ASYM_CIPHER, algorithm, properties,
 412                              evp_asym_cipher_from_dispatch,
 413                              (int (*)(void *))EVP_ASYM_CIPHER_up_ref,
 414                              (void (*)(void *))EVP_ASYM_CIPHER_free);
 415 }
 416
 417 int EVP_ASYM_CIPHER_is_a(const EVP_ASYM_CIPHER *cipher, const char *name)
 418 {
 419     return evp_is_a(cipher->prov, cipher->name_id, NULL, name);
 420 }
 421
 422 int EVP_ASYM_CIPHER_number(const EVP_ASYM_CIPHER *cipher)
 423 {
 424     return cipher->name_id;
 425 }
 426
 427 void EVP_ASYM_CIPHER_do_all_provided(OPENSSL_CTX *libctx,
 428                                      void (*fn)(EVP_ASYM_CIPHER *cipher,
 429                                                 void *arg),
 430                                      void *arg)
 431 {
 432     evp_generic_do_all(libctx, OSSL_OP_ASYM_CIPHER,
 433                        (void (*)(void *, void *))fn, arg,
 434                        evp_asym_cipher_from_dispatch,
 435                        (void (*)(void *))EVP_ASYM_CIPHER_free);
 436 }
 437
 438
 439 void EVP_ASYM_CIPHER_names_do_all(const EVP_ASYM_CIPHER *cipher,
 440                                   void (*fn)(const char *name, void *data),
 441                                   void *data)
 442 {
 443     if (cipher->prov != NULL)
 444         evp_names_do_all(cipher->prov, cipher->name_id, fn, data);
 445 }
 446
 447 const OSSL_PARAM *EVP_ASYM_CIPHER_gettable_ctx_params(const EVP_ASYM_CIPHER *cip)
 448 {
 449     void *provctx;
 450
 451     if (cip == NULL || cip->gettable_ctx_params == NULL)
 452         return NULL;
 453
 454     provctx = ossl_provider_ctx(EVP_ASYM_CIPHER_provider(cip));
 455     return cip->gettable_ctx_params(provctx);
 456 }
 457
 458 const OSSL_PARAM *EVP_ASYM_CIPHER_settable_ctx_params(const EVP_ASYM_CIPHER *cip)
 459 {
 460     void *provctx;
 461
 462     if (cip == NULL || cip->settable_ctx_params == NULL)
 463         return NULL;
 464
 465     provctx = ossl_provider_ctx(EVP_ASYM_CIPHER_provider(cip));
 466     return cip->settable_ctx_params(provctx);
 467 }