crypto/evp/pmeth_fn.c

   1 /*
   2  * Copyright 2006-2016 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 (ctx->keytype == NULL || ctx->engine != NULL)
  42         goto legacy;
  43
  44     /* Ensure that the key is provided.  If not, go legacy */
  45     tmp_keymgmt = ctx->keymgmt;
  46     provkey = evp_pkey_make_provided(ctx->pkey, ctx->libctx,
  47                                      &tmp_keymgmt, ctx->propquery, 0);
  48     if (provkey == NULL)
  49         goto legacy;
  50     if (!EVP_KEYMGMT_up_ref(tmp_keymgmt)) {
  51         ERR_clear_last_mark();
  52         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
  53         goto err;
  54     }
  55     EVP_KEYMGMT_free(ctx->keymgmt);
  56     ctx->keymgmt = tmp_keymgmt;
  57
  58     if (ctx->keymgmt->query_operation_name != NULL)
  59         supported_ciph =
  60             ctx->keymgmt->query_operation_name(OSSL_OP_ASYM_CIPHER);
  61
  62     /*
  63      * If we didn't get a supported ciph, assume there is one with the
  64      * same name as the key type.
  65      */
  66     if (supported_ciph == NULL)
  67         supported_ciph = ctx->keytype;
  68
  69     /*
  70      * Because we cleared out old ops, we shouldn't need to worry about
  71      * checking if cipher is already there.
  72      */
  73     cipher =
  74         EVP_ASYM_CIPHER_fetch(ctx->libctx, supported_ciph, ctx->propquery);
  75
  76     if (cipher == NULL
  77         || (EVP_KEYMGMT_provider(ctx->keymgmt)
  78             != EVP_ASYM_CIPHER_provider(cipher))) {
  79         /*
  80          * We don't need to free ctx->keymgmt here, as it's not necessarily
  81          * tied to this operation.  It will be freed by EVP_PKEY_CTX_free().
  82          */
  83         EVP_ASYM_CIPHER_free(cipher);
  84         goto legacy;
  85     }
  86
  87     /*
  88      * TODO remove this when legacy is gone
  89      * If we don't have the full support we need with provided methods,
  90      * let's go see if legacy does.
  91      */
  92     ERR_pop_to_mark();
  93
  94     /* No more legacy from here down to legacy: */
  95
  96     ctx->op.ciph.cipher = cipher;
  97     ctx->op.ciph.ciphprovctx = cipher->newctx(ossl_provider_ctx(cipher->prov));
  98     if (ctx->op.ciph.ciphprovctx == NULL) {
  99         /* The provider key can stay in the cache */
 100         EVPerr(0, EVP_R_INITIALIZATION_ERROR);
 101         goto err;
 102     }
 103
 104     switch (operation) {
 105     case EVP_PKEY_OP_ENCRYPT:
 106         if (cipher->encrypt_init == NULL) {
 107             EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 108             ret = -2;
 109             goto err;
 110         }
 111         ret = cipher->encrypt_init(ctx->op.ciph.ciphprovctx, provkey);
 112         break;
 113     case EVP_PKEY_OP_DECRYPT:
 114         if (cipher->decrypt_init == NULL) {
 115             EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 116             ret = -2;
 117             goto err;
 118         }
 119         ret = cipher->decrypt_init(ctx->op.ciph.ciphprovctx, provkey);
 120         break;
 121     default:
 122         EVPerr(0, EVP_R_INITIALIZATION_ERROR);
 123         goto err;
 124     }
 125
 126     if (ret <= 0) {
 127         cipher->freectx(ctx->op.ciph.ciphprovctx);
 128         ctx->op.ciph.ciphprovctx = NULL;
 129         goto err;
 130     }
 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         ctx->operation = EVP_PKEY_OP_UNDEFINED;
 164     return ret;
 165 }
 166
 167 int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx)
 168 {
 169     return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_ENCRYPT);
 170 }
 171
 172 int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx,
 173                      unsigned char *out, size_t *outlen,
 174                      const unsigned char *in, size_t inlen)
 175 {
 176     int ret;
 177
 178     if (ctx == NULL) {
 179         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 180         return -2;
 181     }
 182
 183     if (ctx->operation != EVP_PKEY_OP_ENCRYPT) {
 184         EVPerr(0, EVP_R_OPERATON_NOT_INITIALIZED);
 185         return -1;
 186     }
 187
 188     if (ctx->op.ciph.ciphprovctx == NULL)
 189         goto legacy;
 190
 191     ret = ctx->op.ciph.cipher->encrypt(ctx->op.ciph.ciphprovctx, out, outlen,
 192                                        (out == NULL ? 0 : *outlen), in, inlen);
 193     return ret;
 194
 195  legacy:
 196     if (ctx->pmeth == NULL || ctx->pmeth->encrypt == NULL) {
 197         EVPerr(EVP_F_EVP_PKEY_ENCRYPT,
 198                EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 199         return -2;
 200     }
 201     M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_ENCRYPT)
 202         return ctx->pmeth->encrypt(ctx, out, outlen, in, inlen);
 203 }
 204
 205 int EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx)
 206 {
 207     return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_DECRYPT);
 208 }
 209
 210 int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx,
 211                      unsigned char *out, size_t *outlen,
 212                      const unsigned char *in, size_t inlen)
 213 {
 214     int ret;
 215
 216     if (ctx == NULL) {
 217         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 218         return -2;
 219     }
 220
 221     if (ctx->operation != EVP_PKEY_OP_DECRYPT) {
 222         EVPerr(0, EVP_R_OPERATON_NOT_INITIALIZED);
 223         return -1;
 224     }
 225
 226     if (ctx->op.ciph.ciphprovctx == NULL)
 227         goto legacy;
 228
 229     ret = ctx->op.ciph.cipher->decrypt(ctx->op.ciph.ciphprovctx, out, outlen,
 230                                        (out == NULL ? 0 : *outlen), in, inlen);
 231     return ret;
 232
 233  legacy:
 234     if (ctx->pmeth == NULL || ctx->pmeth->decrypt == NULL) {
 235         EVPerr(EVP_F_EVP_PKEY_DECRYPT,
 236                EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 237         return -2;
 238     }
 239     M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_DECRYPT)
 240         return ctx->pmeth->decrypt(ctx, out, outlen, in, inlen);
 241 }
 242
 243
 244 static EVP_ASYM_CIPHER *evp_asym_cipher_new(OSSL_PROVIDER *prov)
 245 {
 246     EVP_ASYM_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_ASYM_CIPHER));
 247
 248     if (cipher == NULL) {
 249         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
 250         return NULL;
 251     }
 252
 253     cipher->lock = CRYPTO_THREAD_lock_new();
 254     if (cipher->lock == NULL) {
 255         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
 256         OPENSSL_free(cipher);
 257         return NULL;
 258     }
 259     cipher->prov = prov;
 260     ossl_provider_up_ref(prov);
 261     cipher->refcnt = 1;
 262
 263     return cipher;
 264 }
 265
 266 static void *evp_asym_cipher_from_dispatch(int name_id,
 267                                            const OSSL_DISPATCH *fns,
 268                                            OSSL_PROVIDER *prov)
 269 {
 270     EVP_ASYM_CIPHER *cipher = NULL;
 271     int ctxfncnt = 0, encfncnt = 0, decfncnt = 0;
 272     int gparamfncnt = 0, sparamfncnt = 0;
 273
 274     if ((cipher = evp_asym_cipher_new(prov)) == NULL) {
 275         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
 276         goto err;
 277     }
 278
 279     cipher->name_id = name_id;
 280
 281     for (; fns->function_id != 0; fns++) {
 282         switch (fns->function_id) {
 283         case OSSL_FUNC_ASYM_CIPHER_NEWCTX:
 284             if (cipher->newctx != NULL)
 285                 break;
 286             cipher->newctx = OSSL_get_OP_asym_cipher_newctx(fns);
 287             ctxfncnt++;
 288             break;
 289         case OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT:
 290             if (cipher->encrypt_init != NULL)
 291                 break;
 292             cipher->encrypt_init = OSSL_get_OP_asym_cipher_encrypt_init(fns);
 293             encfncnt++;
 294             break;
 295         case OSSL_FUNC_ASYM_CIPHER_ENCRYPT:
 296             if (cipher->encrypt != NULL)
 297                 break;
 298             cipher->encrypt = OSSL_get_OP_asym_cipher_encrypt(fns);
 299             encfncnt++;
 300             break;
 301         case OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT:
 302             if (cipher->decrypt_init != NULL)
 303                 break;
 304             cipher->decrypt_init = OSSL_get_OP_asym_cipher_decrypt_init(fns);
 305             decfncnt++;
 306             break;
 307         case OSSL_FUNC_ASYM_CIPHER_DECRYPT:
 308             if (cipher->decrypt != NULL)
 309                 break;
 310             cipher->decrypt = OSSL_get_OP_asym_cipher_decrypt(fns);
 311             decfncnt++;
 312             break;
 313         case OSSL_FUNC_ASYM_CIPHER_FREECTX:
 314             if (cipher->freectx != NULL)
 315                 break;
 316             cipher->freectx = OSSL_get_OP_asym_cipher_freectx(fns);
 317             ctxfncnt++;
 318             break;
 319         case OSSL_FUNC_ASYM_CIPHER_DUPCTX:
 320             if (cipher->dupctx != NULL)
 321                 break;
 322             cipher->dupctx = OSSL_get_OP_asym_cipher_dupctx(fns);
 323             break;
 324         case OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS:
 325             if (cipher->get_ctx_params != NULL)
 326                 break;
 327             cipher->get_ctx_params
 328                 = OSSL_get_OP_asym_cipher_get_ctx_params(fns);
 329             gparamfncnt++;
 330             break;
 331         case OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS:
 332             if (cipher->gettable_ctx_params != NULL)
 333                 break;
 334             cipher->gettable_ctx_params
 335                 = OSSL_get_OP_asym_cipher_gettable_ctx_params(fns);
 336             gparamfncnt++;
 337             break;
 338         case OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS:
 339             if (cipher->set_ctx_params != NULL)
 340                 break;
 341             cipher->set_ctx_params
 342                 = OSSL_get_OP_asym_cipher_set_ctx_params(fns);
 343             sparamfncnt++;
 344             break;
 345         case OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS:
 346             if (cipher->settable_ctx_params != NULL)
 347                 break;
 348             cipher->settable_ctx_params
 349                 = OSSL_get_OP_asym_cipher_settable_ctx_params(fns);
 350             sparamfncnt++;
 351             break;
 352         }
 353     }
 354     if (ctxfncnt != 2
 355         || (encfncnt != 0 && encfncnt != 2)
 356         || (decfncnt != 0 && decfncnt != 2)
 357         || (encfncnt != 2 && decfncnt != 2)
 358         || (gparamfncnt != 0 && gparamfncnt != 2)
 359         || (sparamfncnt != 0 && sparamfncnt != 2)) {
 360         /*
 361          * In order to be a consistent set of functions we must have at least
 362          * a set of context functions (newctx and freectx) as well as a pair of
 363          * "cipher" functions: (encrypt_init, encrypt) or
 364          * (decrypt_init decrypt). set_ctx_params and settable_ctx_params are
 365          * optional, but if one of them is present then the other one must also
 366          * be present. The same applies to get_ctx_params and
 367          * gettable_ctx_params. The dupctx function is optional.
 368          */
 369         ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
 370         goto err;
 371     }
 372
 373     return cipher;
 374  err:
 375     EVP_ASYM_CIPHER_free(cipher);
 376     return NULL;
 377 }
 378
 379 void EVP_ASYM_CIPHER_free(EVP_ASYM_CIPHER *cipher)
 380 {
 381     if (cipher != NULL) {
 382         int i;
 383
 384         CRYPTO_DOWN_REF(&cipher->refcnt, &i, cipher->lock);
 385         if (i > 0)
 386             return;
 387         ossl_provider_free(cipher->prov);
 388         CRYPTO_THREAD_lock_free(cipher->lock);
 389         OPENSSL_free(cipher);
 390     }
 391 }
 392
 393 int EVP_ASYM_CIPHER_up_ref(EVP_ASYM_CIPHER *cipher)
 394 {
 395     int ref = 0;
 396
 397     CRYPTO_UP_REF(&cipher->refcnt, &ref, cipher->lock);
 398     return 1;
 399 }
 400
 401 OSSL_PROVIDER *EVP_ASYM_CIPHER_provider(const EVP_ASYM_CIPHER *cipher)
 402 {
 403     return cipher->prov;
 404 }
 405
 406 EVP_ASYM_CIPHER *EVP_ASYM_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
 407                                        const char *properties)
 408 {
 409     return evp_generic_fetch(ctx, OSSL_OP_ASYM_CIPHER, algorithm, properties,
 410                              evp_asym_cipher_from_dispatch,
 411                              (int (*)(void *))EVP_ASYM_CIPHER_up_ref,
 412                              (void (*)(void *))EVP_ASYM_CIPHER_free);
 413 }
 414
 415 int EVP_ASYM_CIPHER_is_a(const EVP_ASYM_CIPHER *cipher, const char *name)
 416 {
 417     return evp_is_a(cipher->prov, cipher->name_id, NULL, name);
 418 }
 419
 420 int EVP_ASYM_CIPHER_number(const EVP_ASYM_CIPHER *cipher)
 421 {
 422     return cipher->name_id;
 423 }
 424
 425 void EVP_ASYM_CIPHER_do_all_provided(OPENSSL_CTX *libctx,
 426                                      void (*fn)(EVP_ASYM_CIPHER *cipher,
 427                                                 void *arg),
 428                                      void *arg)
 429 {
 430     evp_generic_do_all(libctx, OSSL_OP_ASYM_CIPHER,
 431                        (void (*)(void *, void *))fn, arg,
 432                        evp_asym_cipher_from_dispatch,
 433                        (void (*)(void *))EVP_ASYM_CIPHER_free);
 434 }
 435
 436
 437 void EVP_ASYM_CIPHER_names_do_all(const EVP_ASYM_CIPHER *cipher,
 438                                   void (*fn)(const char *name, void *data),
 439                                   void *data)
 440 {
 441     if (cipher->prov != NULL)
 442         evp_names_do_all(cipher->prov, cipher->name_id, fn, data);
 443 }
 444