crypto/cms/cms_sd.c

   1 /* crypto/cms/cms_sd.c */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  */
  53
  54 #include "cryptlib.h"
  55 #include <openssl/asn1t.h>
  56 #include <openssl/pem.h>
  57 #include <openssl/x509.h>
  58 #include <openssl/x509v3.h>
  59 #include <openssl/err.h>
  60 #include <openssl/cms.h>
  61 #include "cms_lcl.h"
  62 #include "asn1_locl.h"
  63
  64 /* CMS SignedData Utilities */
  65
  66 DECLARE_ASN1_ITEM(CMS_SignedData)
  67
  68 static CMS_SignedData *cms_get0_signed(CMS_ContentInfo *cms)
  69         {
  70         if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed)
  71                 {
  72                 CMSerr(CMS_F_CMS_GET0_SIGNED, CMS_R_CONTENT_TYPE_NOT_SIGNED_DATA);
  73                 return NULL;
  74                 }
  75         return cms->d.signedData;
  76         }
  77
  78 static CMS_SignedData *cms_signed_data_init(CMS_ContentInfo *cms)
  79         {
  80         if (cms->d.other == NULL)
  81                 {
  82                 cms->d.signedData = M_ASN1_new_of(CMS_SignedData);
  83                 if (!cms->d.signedData)
  84                         {
  85                         CMSerr(CMS_F_CMS_SIGNED_DATA_INIT, ERR_R_MALLOC_FAILURE);
  86                         return NULL;
  87                         }
  88                 cms->d.signedData->version = 1;
  89                 cms->d.signedData->encapContentInfo->eContentType =
  90                                                 OBJ_nid2obj(NID_pkcs7_data);
  91                 cms->d.signedData->encapContentInfo->partial = 1;
  92                 ASN1_OBJECT_free(cms->contentType);
  93                 cms->contentType = OBJ_nid2obj(NID_pkcs7_signed);
  94                 return cms->d.signedData;
  95                 }
  96         return cms_get0_signed(cms);
  97         }
  98
  99 /* Just initialize SignedData e.g. for certs only structure */
 100
 101 int CMS_SignedData_init(CMS_ContentInfo *cms)
 102         {
 103         if (cms_signed_data_init(cms))
 104                 return 1;
 105         else
 106                 return 0;
 107         }
 108
 109 /* Check structures and fixup version numbers (if necessary) */
 110
 111 static void cms_sd_set_version(CMS_SignedData *sd)
 112         {
 113         int i;
 114         CMS_CertificateChoices *cch;
 115         CMS_RevocationInfoChoice *rch;
 116         CMS_SignerInfo *si;
 117
 118         for (i = 0; i < sk_CMS_CertificateChoices_num(sd->certificates); i++)
 119                 {
 120                 cch = sk_CMS_CertificateChoices_value(sd->certificates, i);
 121                 if (cch->type == CMS_CERTCHOICE_OTHER)
 122                         {
 123                         if (sd->version < 5)
 124                                 sd->version = 5;
 125                         }
 126                 else if (cch->type == CMS_CERTCHOICE_V2ACERT)
 127                         {
 128                         if (sd->version < 4)
 129                                 sd->version = 4;
 130                         }
 131                 else if (cch->type == CMS_CERTCHOICE_V1ACERT)
 132                         {
 133                         if (sd->version < 3)
 134                                 sd->version = 3;
 135                         }
 136                 }
 137
 138         for (i = 0; i < sk_CMS_RevocationInfoChoice_num(sd->crls); i++)
 139                 {
 140                 rch = sk_CMS_RevocationInfoChoice_value(sd->crls, i);
 141                 if (rch->type == CMS_REVCHOICE_OTHER)
 142                         {
 143                         if (sd->version < 5)
 144                                 sd->version = 5;
 145                         }
 146                 }
 147
 148         if ((OBJ_obj2nid(sd->encapContentInfo->eContentType) != NID_pkcs7_data)
 149                         && (sd->version < 3))
 150                 sd->version = 3;
 151
 152         for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++)
 153                 {
 154                 si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
 155                 if (si->sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
 156                         {
 157                         if (si->version < 3)
 158                                 si->version = 3;
 159                         if (sd->version < 3)
 160                                 sd->version = 3;
 161                         }
 162                 else if (si->version < 1)
 163                         si->version = 1;
 164                 }
 165
 166         if (sd->version < 1)
 167                 sd->version = 1;
 168
 169         }
 170
 171 /* Copy an existing messageDigest value */
 172
 173 static int cms_copy_messageDigest(CMS_ContentInfo *cms, CMS_SignerInfo *si)
 174         {
 175         STACK_OF(CMS_SignerInfo) *sinfos;
 176         CMS_SignerInfo *sitmp;
 177         int i;
 178         sinfos = CMS_get0_SignerInfos(cms);
 179         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 180                 {
 181                 ASN1_OCTET_STRING *messageDigest;
 182                 sitmp = sk_CMS_SignerInfo_value(sinfos, i);
 183                 if (sitmp == si)
 184                         continue;
 185                 if (CMS_signed_get_attr_count(sitmp) < 0)
 186                         continue;
 187                 if (OBJ_cmp(si->digestAlgorithm->algorithm,
 188                                 sitmp->digestAlgorithm->algorithm))
 189                         continue;
 190                 messageDigest = CMS_signed_get0_data_by_OBJ(sitmp,
 191                                         OBJ_nid2obj(NID_pkcs9_messageDigest),
 192                                         -3, V_ASN1_OCTET_STRING);
 193                 if (!messageDigest)
 194                         {
 195                         CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST,
 196                                 CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 197                         return 0;
 198                         }
 199
 200                 if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 201                                                 V_ASN1_OCTET_STRING,
 202                                                 messageDigest, -1))
 203                         return 1;
 204                 else
 205                         return 0;
 206                 }
 207                 CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST, CMS_R_NO_MATCHING_DIGEST);
 208                 return 0;
 209         }
 210
 211 int cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert, int type)
 212         {
 213         switch(type)
 214                 {
 215                 case CMS_SIGNERINFO_ISSUER_SERIAL:
 216                 if (!cms_set1_ias(&sid->d.issuerAndSerialNumber, cert))
 217                         return 0;
 218                 break;
 219
 220                 case CMS_SIGNERINFO_KEYIDENTIFIER:
 221                 if (!cms_set1_keyid(&sid->d.subjectKeyIdentifier, cert))
 222                         return 0;
 223                 break;
 224
 225                 default:
 226                 CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, CMS_R_UNKNOWN_ID);
 227                 return 0;
 228                 }
 229
 230         sid->type = type;
 231
 232         return 1;
 233         }
 234
 235 int cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier *sid,
 236                                         ASN1_OCTET_STRING **keyid,
 237                                         X509_NAME **issuer, ASN1_INTEGER **sno)
 238         {
 239         if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
 240                 {
 241                 if (issuer)
 242                         *issuer = sid->d.issuerAndSerialNumber->issuer;
 243                 if (sno)
 244                         *sno = sid->d.issuerAndSerialNumber->serialNumber;
 245                 }
 246         else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
 247                 {
 248                 if (keyid)
 249                         *keyid = sid->d.subjectKeyIdentifier;
 250                 }
 251         else
 252                 return 0;
 253         return 1;
 254         }
 255
 256 int cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert)
 257         {
 258         if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
 259                 return cms_ias_cert_cmp(sid->d.issuerAndSerialNumber, cert);
 260         else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
 261                 return cms_keyid_cert_cmp(sid->d.subjectKeyIdentifier, cert);
 262         else
 263                 return -1;
 264         }
 265
 266 static int cms_sd_asn1_ctrl(CMS_SignerInfo *si, int cmd)
 267         {
 268         EVP_PKEY *pkey = si->pkey;
 269         int i;
 270         if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
 271                 return 1;
 272         i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_SIGN, cmd, si);
 273         if (i == -2)
 274                 {
 275                 CMSerr(CMS_F_CMS_SD_ASN1_CTRL,
 276                                 CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 277                 return 0;
 278                 }
 279         if (i <= 0)
 280                 {
 281                 CMSerr(CMS_F_CMS_SD_ASN1_CTRL, CMS_R_CTRL_FAILURE);
 282                 return 0;
 283                 }
 284         return 1;
 285         }
 286
 287 CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms,
 288                         X509 *signer, EVP_PKEY *pk, const EVP_MD *md,
 289                         unsigned int flags)
 290         {
 291         CMS_SignedData *sd;
 292         CMS_SignerInfo *si = NULL;
 293         X509_ALGOR *alg;
 294         int i, type;
 295         if(!X509_check_private_key(signer, pk))
 296                 {
 297                 CMSerr(CMS_F_CMS_ADD1_SIGNER,
 298                         CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 299                 return NULL;
 300                 }
 301         sd = cms_signed_data_init(cms);
 302         if (!sd)
 303                 goto err;
 304         si = M_ASN1_new_of(CMS_SignerInfo);
 305         if (!si)
 306                 goto merr;
 307         X509_check_purpose(signer, -1, -1);
 308
 309         CRYPTO_add(&pk->references, 1, CRYPTO_LOCK_EVP_PKEY);
 310         CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509);
 311
 312         si->pkey = pk;
 313         si->signer = signer;
 314         EVP_MD_CTX_init(&si->mctx);
 315         si->pctx = NULL;
 316
 317         if (flags & CMS_USE_KEYID)
 318                 {
 319                 si->version = 3;
 320                 if (sd->version < 3)
 321                         sd->version = 3;
 322                 type = CMS_SIGNERINFO_KEYIDENTIFIER;
 323                 }
 324         else
 325                 {
 326                 type = CMS_SIGNERINFO_ISSUER_SERIAL;
 327                 si->version = 1;
 328                 }
 329
 330         if (!cms_set1_SignerIdentifier(si->sid, signer, type))
 331                 goto err;
 332
 333         if (md == NULL)
 334                 {
 335                 int def_nid;
 336                 if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0)
 337                         goto err;
 338                 md = EVP_get_digestbynid(def_nid);
 339                 if (md == NULL)
 340                         {
 341                         CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DEFAULT_DIGEST);
 342                         goto err;
 343                         }
 344                 }
 345
 346         if (!md)
 347                 {
 348                 CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DIGEST_SET);
 349                 goto err;
 350                 }
 351
 352         X509_ALGOR_set_md(si->digestAlgorithm, md);
 353
 354         /* See if digest is present in digestAlgorithms */
 355         for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++)
 356                 {
 357                 ASN1_OBJECT *aoid;
 358                 alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 359                 X509_ALGOR_get0(&aoid, NULL, NULL, alg);
 360                 if (OBJ_obj2nid(aoid) == EVP_MD_type(md))
 361                         break;
 362                 }
 363
 364         if (i == sk_X509_ALGOR_num(sd->digestAlgorithms))
 365                 {
 366                 alg = X509_ALGOR_new();
 367                 if (!alg)
 368                         goto merr;
 369                 X509_ALGOR_set_md(alg, md);
 370                 if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg))
 371                         {
 372                         X509_ALGOR_free(alg);
 373                         goto merr;
 374                         }
 375                 }
 376
 377         if (!(flags & CMS_KEY_PARAM) && !cms_sd_asn1_ctrl(si, 0))
 378                 goto err;
 379         if (!(flags & CMS_NOATTR))
 380                 {
 381                 /* Initialialize signed attributes strutucture so other
 382                  * attributes such as signing time etc are added later
 383                  * even if we add none here.
 384                  */
 385                 if (!si->signedAttrs)
 386                         {
 387                         si->signedAttrs = sk_X509_ATTRIBUTE_new_null();
 388                         if (!si->signedAttrs)
 389                                 goto merr;
 390                         }
 391
 392                 if (!(flags & CMS_NOSMIMECAP))
 393                         {
 394                         STACK_OF(X509_ALGOR) *smcap = NULL;
 395                         i = CMS_add_standard_smimecap(&smcap);
 396                         if (i)
 397                                 i = CMS_add_smimecap(si, smcap);
 398                         sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 399                         if (!i)
 400                                 goto merr;
 401                         }
 402                 if (flags & CMS_REUSE_DIGEST)
 403                         {
 404                         if (!cms_copy_messageDigest(cms, si))
 405                                 goto err;
 406                         if (!(flags & (CMS_PARTIAL|CMS_KEY_PARAM)) &&
 407                                         !CMS_SignerInfo_sign(si))
 408                                 goto err;
 409                         }
 410                 }
 411
 412         if (!(flags & CMS_NOCERTS))
 413                 {
 414                 /* NB ignore -1 return for duplicate cert */
 415                 if (!CMS_add1_cert(cms, signer))
 416                         goto merr;
 417                 }
 418
 419         if (flags & CMS_KEY_PARAM)
 420                 {
 421                 if (flags & CMS_NOATTR)
 422                         {
 423                         si->pctx = EVP_PKEY_CTX_new(si->pkey, NULL);
 424                         if (!si->pctx)
 425                                 goto err;
 426                         if (EVP_PKEY_sign_init(si->pctx) <= 0)
 427                                 goto err;
 428                         if (EVP_PKEY_CTX_set_signature_md(si->pctx, md) <= 0)
 429                                 goto err;
 430                         }
 431                 else if (EVP_DigestSignInit(&si->mctx, &si->pctx, md, NULL, pk) <= 0)
 432                         goto err;
 433                 }
 434
 435         if (!sd->signerInfos)
 436                 sd->signerInfos = sk_CMS_SignerInfo_new_null();
 437         if (!sd->signerInfos ||
 438                 !sk_CMS_SignerInfo_push(sd->signerInfos, si))
 439                 goto merr;
 440
 441         return si;
 442
 443         merr:
 444         CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
 445         err:
 446         if (si)
 447                 M_ASN1_free_of(si, CMS_SignerInfo);
 448         return NULL;
 449
 450         }
 451
 452 static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
 453         {
 454         ASN1_TIME *tt;
 455         int r = 0;
 456         if (t)
 457                 tt = t;
 458         else
 459                 tt = X509_gmtime_adj(NULL, 0);
 460
 461         if (!tt)
 462                 goto merr;
 463
 464         if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
 465                                                 tt->type, tt, -1) <= 0)
 466                 goto merr;
 467
 468         r = 1;
 469
 470         merr:
 471
 472         if (!t)
 473                 ASN1_TIME_free(tt);
 474
 475         if (!r)
 476                 CMSerr(CMS_F_CMS_ADD1_SIGNINGTIME, ERR_R_MALLOC_FAILURE);
 477
 478         return r;
 479
 480         }
 481
 482 EVP_PKEY_CTX *CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo *si)
 483         {
 484         return si->pctx;
 485         }
 486
 487 EVP_MD_CTX *CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo *si)
 488         {
 489         return &si->mctx;
 490         }
 491
 492 STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
 493         {
 494         CMS_SignedData *sd;
 495         sd = cms_get0_signed(cms);
 496         if (!sd)
 497                 return NULL;
 498         return sd->signerInfos;
 499         }
 500
 501 STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms)
 502         {
 503         STACK_OF(X509) *signers = NULL;
 504         STACK_OF(CMS_SignerInfo) *sinfos;
 505         CMS_SignerInfo *si;
 506         int i;
 507         sinfos = CMS_get0_SignerInfos(cms);
 508         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 509                 {
 510                 si = sk_CMS_SignerInfo_value(sinfos, i);
 511                 if (si->signer)
 512                         {
 513                         if (!signers)
 514                                 {
 515                                 signers = sk_X509_new_null();
 516                                 if (!signers)
 517                                         return NULL;
 518                                 }
 519                         if (!sk_X509_push(signers, si->signer))
 520                                 {
 521                                 sk_X509_free(signers);
 522                                 return NULL;
 523                                 }
 524                         }
 525                 }
 526         return signers;
 527         }
 528
 529 void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
 530         {
 531         if (signer)
 532                 {
 533                 CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509);
 534                 if (si->pkey)
 535                         EVP_PKEY_free(si->pkey);
 536                 si->pkey = X509_get_pubkey(signer);
 537                 }
 538         if (si->signer)
 539                 X509_free(si->signer);
 540         si->signer = signer;
 541         }
 542
 543 int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si,
 544                                         ASN1_OCTET_STRING **keyid,
 545                                         X509_NAME **issuer, ASN1_INTEGER **sno)
 546         {
 547         return cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
 548         }
 549
 550 int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
 551         {
 552         return cms_SignerIdentifier_cert_cmp(si->sid, cert);
 553         }
 554
 555 int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
 556                                 unsigned int flags)
 557         {
 558         CMS_SignedData *sd;
 559         CMS_SignerInfo *si;
 560         CMS_CertificateChoices *cch;
 561         STACK_OF(CMS_CertificateChoices) *certs;
 562         X509 *x;
 563         int i, j;
 564         int ret = 0;
 565         sd = cms_get0_signed(cms);
 566         if (!sd)
 567                 return -1;
 568         certs = sd->certificates;
 569         for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++)
 570                 {
 571                 si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
 572                 if (si->signer)
 573                         continue;
 574
 575                 for (j = 0; j < sk_X509_num(scerts); j++)
 576                         {
 577                         x = sk_X509_value(scerts, j);
 578                         if (CMS_SignerInfo_cert_cmp(si, x) == 0)
 579                                 {
 580                                 CMS_SignerInfo_set1_signer_cert(si, x);
 581                                 ret++;
 582                                 break;
 583                                 }
 584                         }
 585
 586                 if (si->signer || (flags & CMS_NOINTERN))
 587                         continue;
 588
 589                 for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++)
 590                         {
 591                         cch = sk_CMS_CertificateChoices_value(certs, j);
 592                         if (cch->type != 0)
 593                                 continue;
 594                         x = cch->d.certificate;
 595                         if (CMS_SignerInfo_cert_cmp(si, x) == 0)
 596                                 {
 597                                 CMS_SignerInfo_set1_signer_cert(si, x);
 598                                 ret++;
 599                                 break;
 600                                 }
 601                         }
 602                 }
 603         return ret;
 604         }
 605
 606 void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk, X509 **signer,
 607                                         X509_ALGOR **pdig, X509_ALGOR **psig)
 608         {
 609         if (pk)
 610                 *pk = si->pkey;
 611         if (signer)
 612                 *signer = si->signer;
 613         if (pdig)
 614                 *pdig = si->digestAlgorithm;
 615         if (psig)
 616                 *psig = si->signatureAlgorithm;
 617         }
 618
 619 ASN1_OCTET_STRING *CMS_SignerInfo_get0_signature(CMS_SignerInfo *si)
 620         {
 621         return si->signature;
 622         }
 623
 624 static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
 625                                         CMS_SignerInfo *si, BIO *chain)
 626         {
 627         EVP_MD_CTX mctx;
 628         int r = 0;
 629         EVP_PKEY_CTX *pctx = NULL;
 630         EVP_MD_CTX_init(&mctx);
 631
 632         if (!si->pkey)
 633                 {
 634                 CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_NO_PRIVATE_KEY);
 635                 return 0;
 636                 }
 637
 638         if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
 639                 goto err;
 640         /* Set SignerInfo algortihm details if we used custom parametsr */
 641         if (si->pctx && !cms_sd_asn1_ctrl(si, 0))
 642                 goto err;
 643
 644         /* If any signed attributes calculate and add messageDigest attribute */
 645
 646         if (CMS_signed_get_attr_count(si) >= 0)
 647                 {
 648                 ASN1_OBJECT *ctype =
 649                         cms->d.signedData->encapContentInfo->eContentType;
 650                 unsigned char md[EVP_MAX_MD_SIZE];
 651                 unsigned int mdlen;
 652                 if (!EVP_DigestFinal_ex(&mctx, md, &mdlen))
 653                         goto err;
 654                 if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 655                                                 V_ASN1_OCTET_STRING,
 656                                                 md, mdlen))
 657                         goto err;
 658                 /* Copy content type across */
 659                 if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
 660                                         V_ASN1_OBJECT, ctype, -1) <= 0)
 661                         goto err;
 662                 if (!CMS_SignerInfo_sign(si))
 663                         goto err;
 664                 }
 665         else if (si->pctx)
 666                 {
 667                 unsigned char *sig;
 668                 size_t siglen;
 669                 unsigned char md[EVP_MAX_MD_SIZE];
 670                 unsigned int mdlen;
 671                 pctx = si->pctx;
 672                 if (!EVP_DigestFinal_ex(&mctx, md, &mdlen))
 673                         goto err;
 674                 siglen = EVP_PKEY_size(si->pkey);
 675                 sig = OPENSSL_malloc(siglen);
 676                 if (!sig)
 677                         {
 678                         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
 679                                         ERR_R_MALLOC_FAILURE);
 680                         goto err;
 681                         }
 682                 if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0)
 683                         {
 684                         OPENSSL_free(sig);
 685                         goto err;
 686                         }
 687                 ASN1_STRING_set0(si->signature, sig, siglen);
 688                 }
 689         else
 690                 {
 691                 unsigned char *sig;
 692                 unsigned int siglen;
 693                 sig = OPENSSL_malloc(EVP_PKEY_size(si->pkey));
 694                 if (!sig)
 695                         {
 696                         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
 697                                         ERR_R_MALLOC_FAILURE);
 698                         goto err;
 699                         }
 700                 if (!EVP_SignFinal(&mctx, sig, &siglen, si->pkey))
 701                         {
 702                         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
 703                                         CMS_R_SIGNFINAL_ERROR);
 704                         OPENSSL_free(sig);
 705                         goto err;
 706                         }
 707                 ASN1_STRING_set0(si->signature, sig, siglen);
 708                 }
 709
 710         r = 1;
 711
 712         err:
 713         EVP_MD_CTX_cleanup(&mctx);
 714         if (pctx)
 715                 EVP_PKEY_CTX_free(pctx);
 716         return r;
 717
 718         }
 719
 720 int cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
 721         {
 722         STACK_OF(CMS_SignerInfo) *sinfos;
 723         CMS_SignerInfo *si;
 724         int i;
 725         sinfos = CMS_get0_SignerInfos(cms);
 726         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 727                 {
 728                 si = sk_CMS_SignerInfo_value(sinfos, i);
 729                 if (!cms_SignerInfo_content_sign(cms, si, chain))
 730                         return 0;
 731                 }
 732         cms->d.signedData->encapContentInfo->partial = 0;
 733         return 1;
 734         }
 735
 736 int CMS_SignerInfo_sign(CMS_SignerInfo *si)
 737         {
 738         EVP_MD_CTX *mctx = &si->mctx;
 739         EVP_PKEY_CTX *pctx;
 740         unsigned char *abuf = NULL;
 741         int alen;
 742         size_t siglen;
 743         const EVP_MD *md = NULL;
 744
 745         md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 746         if (md == NULL)
 747                 return 0;
 748
 749
 750         if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0)
 751                 {
 752                 if (!cms_add1_signingTime(si, NULL))
 753                         goto err;
 754                 }
 755
 756         if (si->pctx)
 757                 pctx = si->pctx;
 758         else
 759                 {
 760                 EVP_MD_CTX_init(mctx);
 761                 if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0)
 762                         goto err;
 763                 }
 764
 765         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 766                                 EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0)
 767                 {
 768                 CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 769                 goto err;
 770                 }
 771
 772         alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs,&abuf,
 773                                 ASN1_ITEM_rptr(CMS_Attributes_Sign));
 774         if(!abuf)
 775                 goto err;
 776         if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
 777                 goto err;
 778         if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
 779                 goto err;
 780         OPENSSL_free(abuf);
 781         abuf = OPENSSL_malloc(siglen);
 782         if(!abuf)
 783                 goto err;
 784         if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
 785                 goto err;
 786
 787         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 788                                 EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0)
 789                 {
 790                 CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 791                 goto err;
 792                 }
 793
 794         EVP_MD_CTX_cleanup(mctx);
 795
 796         ASN1_STRING_set0(si->signature, abuf, siglen);
 797
 798         return 1;
 799
 800         err:
 801         if (abuf)
 802                 OPENSSL_free(abuf);
 803         EVP_MD_CTX_cleanup(mctx);
 804         return 0;
 805
 806         }
 807
 808 int CMS_SignerInfo_verify(CMS_SignerInfo *si)
 809         {
 810         EVP_MD_CTX *mctx = &si->mctx;
 811         unsigned char *abuf = NULL;
 812         int alen, r = -1;
 813         const EVP_MD *md = NULL;
 814
 815         if (!si->pkey)
 816                 {
 817                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_NO_PUBLIC_KEY);
 818                 return -1;
 819                 }
 820
 821         md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 822         if (md == NULL)
 823                 return -1;
 824         EVP_MD_CTX_init(mctx);
 825         if (EVP_DigestVerifyInit(mctx, &si->pctx, md, NULL, si->pkey) <= 0)
 826                 goto err;
 827
 828         if (!cms_sd_asn1_ctrl(si, 1))
 829                 goto err;
 830
 831         alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs,&abuf,
 832                                 ASN1_ITEM_rptr(CMS_Attributes_Verify));
 833         if(!abuf)
 834                 goto err;
 835         r = EVP_DigestVerifyUpdate(mctx, abuf, alen);
 836         OPENSSL_free(abuf);
 837         if (r <= 0)
 838                 {
 839                 r = -1;
 840                 goto err;
 841                 }
 842         r = EVP_DigestVerifyFinal(mctx,
 843                         si->signature->data, si->signature->length);
 844         if (r <= 0)
 845                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_VERIFICATION_FAILURE);
 846         err:
 847         EVP_MD_CTX_cleanup(mctx);
 848         return r;
 849         }
 850
 851 /* Create a chain of digest BIOs from a CMS ContentInfo */
 852
 853 BIO *cms_SignedData_init_bio(CMS_ContentInfo *cms)
 854         {
 855         int i;
 856         CMS_SignedData *sd;
 857         BIO *chain = NULL;
 858         sd = cms_get0_signed(cms);
 859         if (!sd)
 860                 return NULL;
 861         if (cms->d.signedData->encapContentInfo->partial)
 862                 cms_sd_set_version(sd);
 863         for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++)
 864                 {
 865                 X509_ALGOR *digestAlgorithm;
 866                 BIO *mdbio;
 867                 digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 868                 mdbio = cms_DigestAlgorithm_init_bio(digestAlgorithm);
 869                 if (!mdbio)
 870                         goto err;
 871                 if (chain)
 872                          BIO_push(chain, mdbio);
 873                 else
 874                         chain = mdbio;
 875                 }
 876         return chain;
 877         err:
 878         if (chain)
 879                 BIO_free_all(chain);
 880         return NULL;
 881         }
 882
 883 int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
 884         {
 885         ASN1_OCTET_STRING *os = NULL;
 886         EVP_MD_CTX mctx;
 887         EVP_PKEY_CTX *pkctx = NULL;
 888         int r = -1;
 889         unsigned char mval[EVP_MAX_MD_SIZE];
 890         unsigned int mlen;
 891         EVP_MD_CTX_init(&mctx);
 892         /* If we have any signed attributes look for messageDigest value */
 893         if (CMS_signed_get_attr_count(si) >= 0)
 894                 {
 895                 os = CMS_signed_get0_data_by_OBJ(si,
 896                                         OBJ_nid2obj(NID_pkcs9_messageDigest),
 897                                         -3, V_ASN1_OCTET_STRING);
 898                 if (!os)
 899                         {
 900                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 901                                 CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 902                         goto err;
 903                         }
 904                 }
 905
 906         if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
 907                 goto err;
 908
 909         if (EVP_DigestFinal_ex(&mctx, mval, &mlen) <= 0)
 910                 {
 911                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 912                         CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
 913                 goto err;
 914                 }
 915
 916         /* If messageDigest found compare it */
 917
 918         if (os)
 919                 {
 920                 if (mlen != (unsigned int)os->length)
 921                         {
 922                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 923                                 CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
 924                         goto err;
 925                         }
 926
 927                 if (memcmp(mval, os->data, mlen))
 928                         {
 929                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 930                                 CMS_R_VERIFICATION_FAILURE);
 931                         r = 0;
 932                         }
 933                 else
 934                         r = 1;
 935                 }
 936         else
 937                 {
 938                 const EVP_MD *md = EVP_MD_CTX_md(&mctx);
 939                 pkctx = EVP_PKEY_CTX_new(si->pkey, NULL);
 940                 if (EVP_PKEY_verify_init(pkctx) <= 0)
 941                         goto err;
 942                 if (EVP_PKEY_CTX_set_signature_md(pkctx, md) <= 0)
 943                         goto err;
 944                 si->pctx = pkctx;
 945                 if (!cms_sd_asn1_ctrl(si, 1))
 946                         goto err;
 947                 r = EVP_PKEY_verify(pkctx, si->signature->data,
 948                                         si->signature->length,
 949                                         mval, mlen);
 950                 if (r <= 0)
 951                         {
 952                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 953                                 CMS_R_VERIFICATION_FAILURE);
 954                         r = 0;
 955                         }
 956                 }
 957
 958         err:
 959         if (pkctx)
 960                 EVP_PKEY_CTX_free(pkctx);
 961         EVP_MD_CTX_cleanup(&mctx);
 962         return r;
 963
 964         }
 965
 966 int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
 967         {
 968         unsigned char *smder = NULL;
 969         int smderlen, r;
 970         smderlen = i2d_X509_ALGORS(algs, &smder);
 971         if (smderlen <= 0)
 972                 return 0;
 973         r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
 974                                         V_ASN1_SEQUENCE, smder, smderlen);
 975         OPENSSL_free(smder);
 976         return r;
 977         }
 978
 979 int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
 980                                 int algnid, int keysize)
 981         {
 982         X509_ALGOR *alg;
 983         ASN1_INTEGER *key = NULL;
 984         if (keysize > 0)
 985                 {
 986                 key = ASN1_INTEGER_new();
 987                 if (!key || !ASN1_INTEGER_set(key, keysize))
 988                         return 0;
 989                 }
 990         alg = X509_ALGOR_new();
 991         if (!alg)
 992                 {
 993                 if (key)
 994                         ASN1_INTEGER_free(key);
 995                 return 0;
 996                 }
 997
 998         X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
 999                                 key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key);
1000         if (!*algs)
1001                 *algs = sk_X509_ALGOR_new_null();
1002         if (!*algs || !sk_X509_ALGOR_push(*algs, alg))
1003                 {
1004                 X509_ALGOR_free(alg);
1005                 return 0;
1006                 }
1007         return 1;
1008         }
1009
1010 /* Check to see if a cipher exists and if so add S/MIME capabilities */
1011
1012 static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1013         {
1014         if (EVP_get_cipherbynid(nid))
1015                 return CMS_add_simple_smimecap(sk, nid, arg);
1016         return 1;
1017         }
1018
1019 static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1020         {
1021         if (EVP_get_digestbynid(nid))
1022                 return CMS_add_simple_smimecap(sk, nid, arg);
1023         return 1;
1024         }
1025
1026 int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
1027         {
1028         if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
1029                 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
1030                 || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
1031                 || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
1032                 || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
1033                 || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
1034                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
1035                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
1036                 || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
1037                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
1038                 return 0;
1039         return 1;
1040         }