crypto/evp/m_sigver.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 "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_MODULE
  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             if (evp_keymgmt_util_get_deflt_digest_name(tmp_keymgmt, provkey,
 157                                                        locmdname,
 158                                                        sizeof(locmdname)) > 0) {
 159                 mdname = canon_mdname(locmdname);
 160             } else {
 161                 EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST);
 162                 return 0;
 163             }
 164         }
 165
 166         if (mdname != NULL) {
 167             /*
 168              * This might be requested by a later call to EVP_MD_CTX_md().
 169              * In that case the "explicit fetch" rules apply for that
 170              * function (as per man pages), i.e. the ref count is not updated
 171              * so the EVP_MD should not be used beyound the lifetime of the
 172              * EVP_MD_CTX.
 173              */
 174             ctx->reqdigest = ctx->fetched_digest =
 175                 EVP_MD_fetch(locpctx->libctx, mdname, props);
 176         }
 177     }
 178
 179     if (ver) {
 180         if (signature->digest_verify_init == NULL) {
 181             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 182             goto err;
 183         }
 184         ret = signature->digest_verify_init(locpctx->op.sig.sigprovctx,
 185                                             mdname, props, provkey);
 186     } else {
 187         if (signature->digest_sign_init == NULL) {
 188             ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 189             goto err;
 190         }
 191         ret = signature->digest_sign_init(locpctx->op.sig.sigprovctx,
 192                                           mdname, props, provkey);
 193     }
 194
 195     return ret ? 1 : 0;
 196  err:
 197     evp_pkey_ctx_free_old_ops(locpctx);
 198     locpctx->operation = EVP_PKEY_OP_UNDEFINED;
 199     return 0;
 200
 201  legacy:
 202     /*
 203      * TODO remove this when legacy is gone
 204      * If we don't have the full support we need with provided methods,
 205      * let's go see if legacy does.
 206      */
 207     ERR_pop_to_mark();
 208
 209     if (type == NULL && mdname != NULL)
 210         type = evp_get_digestbyname_ex(locpctx->libctx, mdname);
 211
 212     if (ctx->pctx->pmeth == NULL) {
 213         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
 214         return 0;
 215     }
 216
 217     if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) {
 218
 219         if (type == NULL) {
 220             int def_nid;
 221             if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
 222                 type = EVP_get_digestbynid(def_nid);
 223         }
 224
 225         if (type == NULL) {
 226             EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST);
 227             return 0;
 228         }
 229     }
 230
 231     if (ver) {
 232         if (ctx->pctx->pmeth->verifyctx_init) {
 233             if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0)
 234                 return 0;
 235             ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
 236         } else if (ctx->pctx->pmeth->digestverify != 0) {
 237             ctx->pctx->operation = EVP_PKEY_OP_VERIFY;
 238             ctx->update = update;
 239         } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) {
 240             return 0;
 241         }
 242     } else {
 243         if (ctx->pctx->pmeth->signctx_init) {
 244             if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
 245                 return 0;
 246             ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
 247         } else if (ctx->pctx->pmeth->digestsign != 0) {
 248             ctx->pctx->operation = EVP_PKEY_OP_SIGN;
 249             ctx->update = update;
 250         } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) {
 251             return 0;
 252         }
 253     }
 254     if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
 255         return 0;
 256     if (pctx)
 257         *pctx = ctx->pctx;
 258     if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)
 259         return 1;
 260     if (!EVP_DigestInit_ex(ctx, type, e))
 261         return 0;
 262     /*
 263      * This indicates the current algorithm requires
 264      * special treatment before hashing the tbs-message.
 265      */
 266     ctx->pctx->flag_call_digest_custom = 0;
 267     if (ctx->pctx->pmeth->digest_custom != NULL)
 268         ctx->pctx->flag_call_digest_custom = 1;
 269
 270     return 1;
 271 }
 272
 273 int EVP_DigestSignInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 274                           const char *mdname, const char *props, EVP_PKEY *pkey,
 275                           OPENSSL_CTX *libctx)
 276 {
 277     return do_sigver_init(ctx, pctx, NULL, mdname, props, NULL, pkey, libctx,
 278                           0);
 279 }
 280
 281 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 282                        const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 283 {
 284     return do_sigver_init(ctx, pctx, type, NULL, NULL, e, pkey, NULL, 0);
 285 }
 286
 287 int EVP_DigestVerifyInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 288                             const char *mdname, const char *props,
 289                             EVP_PKEY *pkey, OPENSSL_CTX *libctx)
 290 {
 291     return do_sigver_init(ctx, pctx, NULL, mdname, props, NULL, pkey, libctx, 1);
 292 }
 293
 294 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
 295                          const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
 296 {
 297     return do_sigver_init(ctx, pctx, type, NULL, NULL, e, pkey, NULL, 1);
 298 }
 299 #endif /* FIPS_MDOE */
 300
 301 int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
 302 {
 303     EVP_PKEY_CTX *pctx = ctx->pctx;
 304
 305     if (pctx == NULL
 306             || pctx->operation != EVP_PKEY_OP_SIGNCTX
 307             || pctx->op.sig.sigprovctx == NULL
 308             || pctx->op.sig.signature == NULL)
 309         goto legacy;
 310
 311     if (pctx->op.sig.signature->digest_sign_update == NULL) {
 312         ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 313         return 0;
 314     }
 315
 316     return pctx->op.sig.signature->digest_sign_update(pctx->op.sig.sigprovctx,
 317                                                       data, dsize);
 318
 319  legacy:
 320     /* do_sigver_init() checked that |digest_custom| is non-NULL */
 321     if (pctx->flag_call_digest_custom
 322         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 323         return 0;
 324     pctx->flag_call_digest_custom = 0;
 325
 326     return EVP_DigestUpdate(ctx, data, dsize);
 327 }
 328
 329 int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
 330 {
 331     EVP_PKEY_CTX *pctx = ctx->pctx;
 332
 333     if (pctx == NULL
 334             || pctx->operation != EVP_PKEY_OP_VERIFYCTX
 335             || pctx->op.sig.sigprovctx == NULL
 336             || pctx->op.sig.signature == NULL)
 337         goto legacy;
 338
 339     if (pctx->op.sig.signature->digest_verify_update == NULL) {
 340         ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 341         return 0;
 342     }
 343
 344     return pctx->op.sig.signature->digest_verify_update(pctx->op.sig.sigprovctx,
 345                                                         data, dsize);
 346
 347  legacy:
 348     /* do_sigver_init() checked that |digest_custom| is non-NULL */
 349     if (pctx->flag_call_digest_custom
 350         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 351         return 0;
 352     pctx->flag_call_digest_custom = 0;
 353
 354     return EVP_DigestUpdate(ctx, data, dsize);
 355 }
 356
 357 #ifndef FIPS_MODULE
 358 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
 359                         size_t *siglen)
 360 {
 361     int sctx = 0, r = 0;
 362     EVP_PKEY_CTX *pctx = ctx->pctx;
 363
 364     if (pctx == NULL
 365             || pctx->operation != EVP_PKEY_OP_SIGNCTX
 366             || pctx->op.sig.sigprovctx == NULL
 367             || pctx->op.sig.signature == NULL)
 368         goto legacy;
 369
 370     return pctx->op.sig.signature->digest_sign_final(pctx->op.sig.sigprovctx,
 371                                                      sigret, siglen, SIZE_MAX);
 372
 373  legacy:
 374     if (pctx == NULL || pctx->pmeth == NULL) {
 375         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 376         return 0;
 377     }
 378
 379     /* do_sigver_init() checked that |digest_custom| is non-NULL */
 380     if (pctx->flag_call_digest_custom
 381         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 382         return 0;
 383     pctx->flag_call_digest_custom = 0;
 384
 385     if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) {
 386         if (sigret == NULL)
 387             return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 388         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE)
 389             r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 390         else {
 391             EVP_PKEY_CTX *dctx = EVP_PKEY_CTX_dup(pctx);
 392
 393             if (dctx == NULL)
 394                 return 0;
 395             r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx);
 396             EVP_PKEY_CTX_free(dctx);
 397         }
 398         return r;
 399     }
 400     if (pctx->pmeth->signctx != NULL)
 401         sctx = 1;
 402     else
 403         sctx = 0;
 404     if (sigret != NULL) {
 405         unsigned char md[EVP_MAX_MD_SIZE];
 406         unsigned int mdlen = 0;
 407
 408         if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 409             if (sctx)
 410                 r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
 411             else
 412                 r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 413         } else {
 414             EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 415
 416             if (tmp_ctx == NULL)
 417                 return 0;
 418             if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 419                 EVP_MD_CTX_free(tmp_ctx);
 420                 return 0;
 421             }
 422             if (sctx)
 423                 r = tmp_ctx->pctx->pmeth->signctx(tmp_ctx->pctx,
 424                                                   sigret, siglen, tmp_ctx);
 425             else
 426                 r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 427             EVP_MD_CTX_free(tmp_ctx);
 428         }
 429         if (sctx || !r)
 430             return r;
 431         if (EVP_PKEY_sign(pctx, sigret, siglen, md, mdlen) <= 0)
 432             return 0;
 433     } else {
 434         if (sctx) {
 435             if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0)
 436                 return 0;
 437         } else {
 438             int s = EVP_MD_size(ctx->digest);
 439
 440             if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0)
 441                 return 0;
 442         }
 443     }
 444     return 1;
 445 }
 446
 447 int EVP_DigestSign(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen,
 448                    const unsigned char *tbs, size_t tbslen)
 449 {
 450     EVP_PKEY_CTX *pctx = ctx->pctx;
 451
 452     if (pctx != NULL
 453             && pctx->operation == EVP_PKEY_OP_SIGNCTX
 454             && pctx->op.sig.sigprovctx != NULL
 455             && pctx->op.sig.signature != NULL) {
 456         if (pctx->op.sig.signature->digest_sign != NULL)
 457             return pctx->op.sig.signature->digest_sign(pctx->op.sig.sigprovctx,
 458                                                        sigret, siglen, SIZE_MAX,
 459                                                        tbs, tbslen);
 460     } else {
 461         /* legacy */
 462         if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestsign != NULL)
 463             return ctx->pctx->pmeth->digestsign(ctx, sigret, siglen, tbs, tbslen);
 464     }
 465
 466     if (sigret != NULL && EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0)
 467         return 0;
 468     return EVP_DigestSignFinal(ctx, sigret, siglen);
 469 }
 470
 471 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
 472                           size_t siglen)
 473 {
 474     unsigned char md[EVP_MAX_MD_SIZE];
 475     int r = 0;
 476     unsigned int mdlen = 0;
 477     int vctx = 0;
 478     EVP_PKEY_CTX *pctx = ctx->pctx;
 479
 480     if (pctx == NULL
 481             || pctx->operation != EVP_PKEY_OP_VERIFYCTX
 482             || pctx->op.sig.sigprovctx == NULL
 483             || pctx->op.sig.signature == NULL)
 484         goto legacy;
 485
 486     return pctx->op.sig.signature->digest_verify_final(pctx->op.sig.sigprovctx,
 487                                                        sig, siglen);
 488
 489  legacy:
 490     if (pctx == NULL || pctx->pmeth == NULL) {
 491         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
 492         return 0;
 493     }
 494
 495     /* do_sigver_init() checked that |digest_custom| is non-NULL */
 496     if (pctx->flag_call_digest_custom
 497         && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
 498         return 0;
 499     pctx->flag_call_digest_custom = 0;
 500
 501     if (pctx->pmeth->verifyctx != NULL)
 502         vctx = 1;
 503     else
 504         vctx = 0;
 505     if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
 506         if (vctx)
 507             r = pctx->pmeth->verifyctx(pctx, sig, siglen, ctx);
 508         else
 509             r = EVP_DigestFinal_ex(ctx, md, &mdlen);
 510     } else {
 511         EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
 512         if (tmp_ctx == NULL)
 513             return -1;
 514         if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
 515             EVP_MD_CTX_free(tmp_ctx);
 516             return -1;
 517         }
 518         if (vctx)
 519             r = tmp_ctx->pctx->pmeth->verifyctx(tmp_ctx->pctx,
 520                                                 sig, siglen, tmp_ctx);
 521         else
 522             r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
 523         EVP_MD_CTX_free(tmp_ctx);
 524     }
 525     if (vctx || !r)
 526         return r;
 527     return EVP_PKEY_verify(pctx, sig, siglen, md, mdlen);
 528 }
 529
 530 int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret,
 531                      size_t siglen, const unsigned char *tbs, size_t tbslen)
 532 {
 533     EVP_PKEY_CTX *pctx = ctx->pctx;
 534
 535     if (pctx != NULL
 536             && pctx->operation == EVP_PKEY_OP_VERIFYCTX
 537             && pctx->op.sig.sigprovctx != NULL
 538             && pctx->op.sig.signature != NULL) {
 539         if (pctx->op.sig.signature->digest_verify != NULL)
 540             return pctx->op.sig.signature->digest_verify(pctx->op.sig.sigprovctx,
 541                                                          sigret, siglen,
 542                                                          tbs, tbslen);
 543     } else {
 544         /* legacy */
 545         if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestverify != NULL)
 546             return ctx->pctx->pmeth->digestverify(ctx, sigret, siglen, tbs, tbslen);
 547     }
 548
 549     if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0)
 550         return -1;
 551     return EVP_DigestVerifyFinal(ctx, sigret, siglen);
 552 }
 553 #endif /* FIPS_MODULE */