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