crypto/evp/m_sigver.c

   1 /*
   2  * Copyright 2006-2018 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 "internal/cryptlib.h"
  12 #include <openssl/evp.h>
  13 #include <openssl/objects.h>
  14 #include <openssl/x509.h>
  15 #include "crypto/evp.h"
  16 #include "internal/provider.h"
  17 #include "evp_local.h"
  18
  19 #ifndef FIPS_MODE
  20
  21 static int update(EVP_MD_CTX *ctx, const void *data, size_t datalen)
  22 {
  23     EVPerr(EVP_F_UPDATE, EVP_R_ONLY_ONESHOT_SUPPORTED);
  24     return 0;
  25 }
  26
  27 /*
  28  * If we get the "NULL" md then the name comes back as "UNDEF". We want to use
  29  * NULL for this.
  30  */
  31 static const char *canon_mdname(const char *mdname)
  32 {
  33     if (mdname != NULL && strcmp(mdname, "UNDEF") == 0)
  34         return NULL;
  35
  36     return mdname;
  37 }
  38
  39 static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
  40                           const EVP_MD *type, const char *mdname,
  41                           const char *props, ENGINE *e, EVP_PKEY *pkey,
  42                           OPENSSL_CTX *libctx, int ver)
  43 {
  44     EVP_PKEY_CTX *locpctx = NULL;
  45     EVP_SIGNATURE *signature = NULL;
  46     EVP_KEYMGMT *tmp_keymgmt = NULL;
  47     const char *supported_sig = NULL;
  48     char locmdname[80] = "";     /* 80 chars should be enough */
  49     void *provkey = NULL;
  50     int ret;
  51
  52     if (ctx->provctx != NULL) {
  53         if (!ossl_assert(ctx->digest != NULL)) {
  54             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
  55             return 0;
  56         }
  57         if (ctx->digest->freectx != NULL)
  58             ctx->digest->freectx(ctx->provctx);
  59         ctx->provctx = NULL;
  60     }
  61
  62     if (ctx->pctx == NULL) {
  63         if (libctx != NULL)
  64             ctx->pctx = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, props);
  65         else
  66             ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
  67     }
  68     if (ctx->pctx == NULL)
  69         return 0;
  70
  71     locpctx = ctx->pctx;
  72     evp_pkey_ctx_free_old_ops(locpctx);
  73
  74     /*
  75      * TODO when we stop falling back to legacy, this and the ERR_pop_to_mark()
  76      * calls can be removed.
  77      */
  78     ERR_set_mark();
  79
  80     if (locpctx->engine != NULL || locpctx->keytype == NULL)
  81         goto legacy;
  82
  83     /*
  84      * Ensure that the key is provided, either natively, or as a cached export.
  85      *  If not, go legacy
  86      */
  87     tmp_keymgmt = locpctx->keymgmt;
  88     provkey = evp_pkey_export_to_provider(locpctx->pkey, locpctx->libctx,
  89                                           &tmp_keymgmt, locpctx->propquery);
  90     if (provkey == NULL)
  91         goto legacy;
  92     if (!EVP_KEYMGMT_up_ref(tmp_keymgmt)) {
  93         ERR_clear_last_mark();
  94         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
  95         goto err;
  96     }
  97     EVP_KEYMGMT_free(locpctx->keymgmt);
  98     locpctx->keymgmt = tmp_keymgmt;
  99
 100     if (locpctx->keymgmt->query_operation_name != NULL)
 101         supported_sig =
 102             locpctx->keymgmt->query_operation_name(OSSL_OP_SIGNATURE);
 103
 104     /*
 105      * If we didn't get a supported sig, assume there is one with the
 106      * same name as the key type.
 107      */
 108     if (supported_sig == NULL)
 109         supported_sig = locpctx->keytype;
 110
 111     /*
 112      * Because we cleared out old ops, we shouldn't need to worry about
 113      * checking if signature is already there.
 114      */
 115     signature = EVP_SIGNATURE_fetch(locpctx->libctx, supported_sig,
 116                                     locpctx->propquery);
 117
 118     if (signature == NULL
 119         || (EVP_KEYMGMT_provider(locpctx->keymgmt)
 120             != EVP_SIGNATURE_provider(signature))) {
 121         /*
 122          * We don't need to free ctx->keymgmt here, as it's not necessarily
 123          * tied to this operation.  It will be freed by EVP_PKEY_CTX_free().
 124          */
 125         EVP_SIGNATURE_free(signature);
 126         goto legacy;
 127     }
 128
 129     /*
 130      * TODO remove this when legacy is gone
 131      * If we don't have the full support we need with provided methods,
 132      * let's go see if legacy does.
 133      */
 134     ERR_pop_to_mark();
 135
 136     /* No more legacy from here down to legacy: */
 137
 138     if (pctx != NULL)
 139         *pctx = locpctx;
 140
 141     locpctx->op.sig.signature = signature;
 142     locpctx->operation = ver ? EVP_PKEY_OP_VERIFYCTX
 143                              : EVP_PKEY_OP_SIGNCTX;
 144     locpctx->op.sig.sigprovctx
 145         = signature->newctx(ossl_provider_ctx(signature->prov));
 146     if (locpctx->op.sig.sigprovctx == NULL) {
 147         ERR_raise(ERR_LIB_EVP,  EVP_R_INITIALIZATION_ERROR);
 148         goto err;
 149     }
 150     if (type != NULL) {
 151         ctx->reqdigest = type;
 152         if (mdname == NULL)
 153             mdname = canon_mdname(EVP_MD_name(type));
 154     } else {
 155         if (mdname == NULL
 156             && EVP_PKEY_get_default_digest_name(locpctx->pkey, locmdname,
 157                                                 sizeof(locmdname)))
 158             mdname = canon_mdname(locmdname);
 159
 160         if (mdname != NULL) {
 161             /*
 162              * This might be requested by a later call to EVP_MD_CTX_md().
 163              * In that case the "explicit fetch" rules apply for that
 164              * function (as per man pages), i.e. the ref count is not updated
 165              * so the EVP_MD should not be used beyound the lifetime of the
 166              * EVP_MD_CTX.
 167              */
 168             ctx->reqdigest = ctx->fetched_digest =
 169                 EVP_MD_fetch(locpctx->libctx, mdname, props);
 170         }
 171     }
 172
 173     if (ver) {
 174         if (signature->digest_verify_init == NULL) {
 175             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 176             goto err;
 177         }
 178         ret = signature->digest_verify_init(locpctx->op.sig.sigprovctx,
 179                                             mdname, props, provkey);
 180     } else {
 181         if (signature->digest_sign_init == NULL) {
 182             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 183             goto err;
 184         }
 185         ret = signature->digest_sign_init(locpctx->op.sig.sigprovctx,
 186                                           mdname, props, provkey);
 187     }
 188
 189     return ret ? 1 : 0;
 190  err:
 191     evp_pkey_ctx_free_old_ops(locpctx);
 192     locpctx->operation = EVP_PKEY_OP_UNDEFINED;
 193     return 0;
 194
 195  legacy:
 196     /*
 197      * TODO remove this when legacy is gone
 198      * If we don't have the full support we need with provided methods,
 199      * let's go see if legacy does.
 200      */
 201     ERR_pop_to_mark();
 202
 203     if (type == NULL && mdname != NULL)
 204         type = evp_get_digestbyname_ex(locpctx->libctx, mdname);
 205
 206     if (ctx->pctx->pmeth == NULL) {
 207         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 208         return 0;
 209     }
 210
 211     if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) {
 212
 213         if (type == NULL) {
 214             int def_nid;
 215             if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
 216                 type = EVP_get_digestbynid(def_nid);
 217         }
 218
 219         if (type == NULL) {
 220             EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST);
 221             return 0;
 222         }
 223     }
 224
 225     if (ver) {
 226         if (ctx->pctx->pmeth->verifyctx_init) {
 227             if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0)
 228                 return 0;
 229             ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
 230         } else if (ctx->pctx->pmeth->digestverify != 0) {
 231             ctx->pctx->operation = EVP_PKEY_OP_VERIFY;
 232             ctx->update = update;
 233         } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) {
 234             return 0;
 235         }
 236     } else {
 237         if (ctx->pctx->pmeth->signctx_init) {
 238             if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
 239                 return 0;
 240             ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
 241         } else if (ctx->pctx->pmeth->digestsign != 0) {
 242             ctx->pctx->operation = EVP_PKEY_OP_SIGN;
 243             ctx->update = update;
 244         } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) {
 245             return 0;
 246         }
 247     }
 248     if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
 249         return 0;
 250     if (pctx)
 251         *pctx = ctx->pctx;
 252     if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)
 253         return 1;
 254     if (!EVP_DigestInit_ex(ctx, type, e))
 255         return 0;
 256     /*
 257      * This indicates the current algorithm requires
 258      * special treatment before hashing the tbs-message.
 259      */
 260     ctx->pctx->flag_call_digest_custom = 0;
 261     if (ctx->pctx->pmeth->digest_custom != NULL)
 262         ctx->pctx->flag_call_digest_custom = 1;
 263
 264     return 1;
 265 }
 266
 267 int EVP_DigestSignInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 268                           const char *mdname, const char *props, EVP_PKEY *pkey,
 269                           OPENSSL_CTX *libctx)
 270 {
 271     return do_sigver_init(ctx, pctx, NULL, mdname, props, NULL, pkey, libctx,
 272                           0);
 273 }
 274
 275 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 276                        const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 277 {
 278     return do_sigver_init(ctx, pctx, type, NULL, NULL, e, pkey, NULL, 0);
 279 }
 280
 281 int EVP_DigestVerifyInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 282                             const char *mdname, const char *props,
 283                             EVP_PKEY *pkey, OPENSSL_CTX *libctx)
 284 {
 285     return do_sigver_init(ctx, pctx, NULL, mdname, props, NULL, pkey, libctx, 1);
 286 }
 287
 288 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 289                          const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 290 {
 291     return do_sigver_init(ctx, pctx, type, NULL, NULL, e, pkey, NULL, 1);
 292 }
 293 #endif /* FIPS_MDOE */
 294
 295 int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
 296 {
 297     EVP_PKEY_CTX *pctx = ctx->pctx;
 298
 299     if (pctx == NULL
 300             || pctx->operation != EVP_PKEY_OP_SIGNCTX
 301             || pctx->op.sig.sigprovctx == NULL
 302             || pctx->op.sig.signature == NULL)
 303         goto legacy;
 304
 305     if (pctx->op.sig.signature->digest_sign_update == NULL) {
 306         ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 307         return 0;
 308     }
 309
 310     return pctx->op.sig.signature->digest_sign_update(pctx->op.sig.sigprovctx,
 311                                                       data, dsize);
 312
 313  legacy:
 314     /* do_sigver_init() checked that |digest_custom| is non-NULL */
 315     if (pctx->flag_call_digest_custom
 316         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 317         return 0;
 318     pctx->flag_call_digest_custom = 0;
 319
 320     return EVP_DigestUpdate(ctx, data, dsize);
 321 }
 322
 323 int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
 324 {
 325     EVP_PKEY_CTX *pctx = ctx->pctx;
 326
 327     if (pctx == NULL
 328             || pctx->operation != EVP_PKEY_OP_VERIFYCTX
 329             || pctx->op.sig.sigprovctx == NULL
 330             || pctx->op.sig.signature == NULL)
 331         goto legacy;
 332
 333     if (pctx->op.sig.signature->digest_verify_update == NULL) {
 334         ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 335         return 0;
 336     }
 337
 338     return pctx->op.sig.signature->digest_verify_update(pctx->op.sig.sigprovctx,
 339                                                         data, dsize);
 340
 341  legacy:
 342     /* do_sigver_init() checked that |digest_custom| is non-NULL */
 343     if (pctx->flag_call_digest_custom
 344         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 345         return 0;
 346     pctx->flag_call_digest_custom = 0;
 347
 348     return EVP_DigestUpdate(ctx, data, dsize);
 349 }
 350
 351 #ifndef FIPS_MODE
 352 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
 353                         size_t *siglen)
 354 {
 355     int sctx = 0, r = 0;
 356     EVP_PKEY_CTX *pctx = ctx->pctx;
 357
 358     if (pctx == NULL
 359             || pctx->operation != EVP_PKEY_OP_SIGNCTX
 360             || pctx->op.sig.sigprovctx == NULL
 361             || pctx->op.sig.signature == NULL)
 362         goto legacy;
 363
 364     return pctx->op.sig.signature->digest_sign_final(pctx->op.sig.sigprovctx,
 365                                                      sigret, siglen, SIZE_MAX);
 366
 367  legacy:
 368     if (pctx == NULL || pctx->pmeth == NULL) {
 369         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 370         return 0;
 371     }
 372
 373     /* do_sigver_init() checked that |digest_custom| is non-NULL */
 374     if (pctx->flag_call_digest_custom
 375         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 376         return 0;
 377     pctx->flag_call_digest_custom = 0;
 378
 379     if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) {
 380         if (sigret == NULL)
 381             return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 382         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE)
 383             r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 384         else {
 385             EVP_PKEY_CTX *dctx = EVP_PKEY_CTX_dup(pctx);
 386
 387             if (dctx == NULL)
 388                 return 0;
 389             r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx);
 390             EVP_PKEY_CTX_free(dctx);
 391         }
 392         return r;
 393     }
 394     if (pctx->pmeth->signctx != NULL)
 395         sctx = 1;
 396     else
 397         sctx = 0;
 398     if (sigret != NULL) {
 399         unsigned char md[EVP_MAX_MD_SIZE];
 400         unsigned int mdlen = 0;
 401
 402         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 403             if (sctx)
 404                 r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 405             else
 406                 r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 407         } else {
 408             EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 409
 410             if (tmp_ctx == NULL)
 411                 return 0;
 412             if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 413                 EVP_MD_CTX_free(tmp_ctx);
 414                 return 0;
 415             }
 416             if (sctx)
 417                 r = tmp_ctx->pctx->pmeth->signctx(tmp_ctx->pctx,
 418                                                   sigret, siglen, tmp_ctx);
 419             else
 420                 r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 421             EVP_MD_CTX_free(tmp_ctx);
 422         }
 423         if (sctx || !r)
 424             return r;
 425         if (EVP_PKEY_sign(pctx, sigret, siglen, md, mdlen) <= 0)
 426             return 0;
 427     } else {
 428         if (sctx) {
 429             if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0)
 430                 return 0;
 431         } else {
 432             int s = EVP_MD_size(ctx->digest);
 433
 434             if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0)
 435                 return 0;
 436         }
 437     }
 438     return 1;
 439 }
 440
 441 int EVP_DigestSign(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen,
 442                    const unsigned char *tbs, size_t tbslen)
 443 {
 444     EVP_PKEY_CTX *pctx = ctx->pctx;
 445
 446     if (pctx != NULL
 447             && pctx->operation == EVP_PKEY_OP_SIGNCTX
 448             && pctx->op.sig.sigprovctx != NULL
 449             && pctx->op.sig.signature != NULL) {
 450         if (pctx->op.sig.signature->digest_sign != NULL)
 451             return pctx->op.sig.signature->digest_sign(pctx->op.sig.sigprovctx,
 452                                                        sigret, siglen, SIZE_MAX,
 453                                                        tbs, tbslen);
 454     } else {
 455         /* legacy */
 456         if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestsign != NULL)
 457             return ctx->pctx->pmeth->digestsign(ctx, sigret, siglen, tbs, tbslen);
 458     }
 459
 460     if (sigret != NULL && EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0)
 461         return 0;
 462     return EVP_DigestSignFinal(ctx, sigret, siglen);
 463 }
 464
 465 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
 466                           size_t siglen)
 467 {
 468     unsigned char md[EVP_MAX_MD_SIZE];
 469     int r = 0;
 470     unsigned int mdlen = 0;
 471     int vctx = 0;
 472     EVP_PKEY_CTX *pctx = ctx->pctx;
 473
 474     if (pctx == NULL
 475             || pctx->operation != EVP_PKEY_OP_VERIFYCTX
 476             || pctx->op.sig.sigprovctx == NULL
 477             || pctx->op.sig.signature == NULL)
 478         goto legacy;
 479
 480     return pctx->op.sig.signature->digest_verify_final(pctx->op.sig.sigprovctx,
 481                                                        sig, siglen);
 482
 483  legacy:
 484     if (pctx == NULL || pctx->pmeth == NULL) {
 485         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 486         return 0;
 487     }
 488
 489     /* do_sigver_init() checked that |digest_custom| is non-NULL */
 490     if (pctx->flag_call_digest_custom
 491         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 492         return 0;
 493     pctx->flag_call_digest_custom = 0;
 494
 495     if (pctx->pmeth->verifyctx != NULL)
 496         vctx = 1;
 497     else
 498         vctx = 0;
 499     if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 500         if (vctx)
 501             r = pctx->pmeth->verifyctx(pctx, sig, siglen, ctx);
 502         else
 503             r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 504     } else {
 505         EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 506         if (tmp_ctx == NULL)
 507             return -1;
 508         if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 509             EVP_MD_CTX_free(tmp_ctx);
 510             return -1;
 511         }
 512         if (vctx)
 513             r = tmp_ctx->pctx->pmeth->verifyctx(tmp_ctx->pctx,
 514                                                 sig, siglen, tmp_ctx);
 515         else
 516             r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 517         EVP_MD_CTX_free(tmp_ctx);
 518     }
 519     if (vctx || !r)
 520         return r;
 521     return EVP_PKEY_verify(pctx, sig, siglen, md, mdlen);
 522 }
 523
 524 int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret,
 525                      size_t siglen, const unsigned char *tbs, size_t tbslen)
 526 {
 527     EVP_PKEY_CTX *pctx = ctx->pctx;
 528
 529     if (pctx != NULL
 530             && pctx->operation == EVP_PKEY_OP_VERIFYCTX
 531             && pctx->op.sig.sigprovctx != NULL
 532             && pctx->op.sig.signature != NULL) {
 533         if (pctx->op.sig.signature->digest_verify != NULL)
 534             return pctx->op.sig.signature->digest_verify(pctx->op.sig.sigprovctx,
 535                                                          sigret, siglen,
 536                                                          tbs, tbslen);
 537     } else {
 538         /* legacy */
 539         if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestverify != NULL)
 540             return ctx->pctx->pmeth->digestverify(ctx, sigret, siglen, tbs, tbslen);
 541     }
 542
 543     if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0)
 544         return -1;
 545     return EVP_DigestVerifyFinal(ctx, sigret, siglen);
 546 }
 547 #endif /* FIPS_MODE */