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/x509v3.h>
  58 #include <openssl/err.h>
  59 #include <openssl/cms.h>
  60 #include "cms_lcl.h"
  61 #include "asn1_locl.h"
  62
  63 /* CMS SignedData Utilities */
  64
  65 DECLARE_ASN1_ITEM(CMS_SignedData)
  66
  67 static CMS_SignedData *cms_get0_signed(CMS_ContentInfo *cms)
  68         {
  69         if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed)
  70                 {
  71                 CMSerr(CMS_F_CMS_GET0_SIGNED, CMS_R_CONTENT_TYPE_NOT_SIGNED_DATA);
  72                 return NULL;
  73                 }
  74         return cms->d.signedData;
  75         }
  76
  77 static CMS_SignedData *cms_signed_data_init(CMS_ContentInfo *cms)
  78         {
  79         if (cms->d.other == NULL)
  80                 {
  81                 cms->d.signedData = M_ASN1_new_of(CMS_SignedData);
  82                 if (!cms->d.signedData)
  83                         {
  84                         CMSerr(CMS_F_CMS_SIGNED_DATA_INIT, ERR_R_MALLOC_FAILURE);
  85                         return NULL;
  86                         }
  87                 cms->d.signedData->version = 1;
  88                 cms->d.signedData->encapContentInfo->eContentType =
  89                                                 OBJ_nid2obj(NID_pkcs7_data);
  90                 cms->d.signedData->encapContentInfo->partial = 1;
  91                 ASN1_OBJECT_free(cms->contentType);
  92                 cms->contentType = OBJ_nid2obj(NID_pkcs7_signed);
  93                 return cms->d.signedData;
  94                 }
  95         return cms_get0_signed(cms);
  96         }
  97
  98 /* Just initialize SignedData e.g. for certs only structure */
  99
 100 int CMS_SignedData_init(CMS_ContentInfo *cms)
 101         {
 102         if (cms_signed_data_init(cms))
 103                 return 1;
 104         else
 105                 return 0;
 106         }
 107
 108 /* Check structures and fixup version numbers (if necessary) */
 109
 110 static void cms_sd_set_version(CMS_SignedData *sd)
 111         {
 112         int i;
 113         CMS_CertificateChoices *cch;
 114         CMS_RevocationInfoChoice *rch;
 115         CMS_SignerInfo *si;
 116
 117         for (i = 0; i < sk_CMS_CertificateChoices_num(sd->certificates); i++)
 118                 {
 119                 cch = sk_CMS_CertificateChoices_value(sd->certificates, i);
 120                 if (cch->type == CMS_CERTCHOICE_OTHER)
 121                         {
 122                         if (sd->version < 5)
 123                                 sd->version = 5;
 124                         }
 125                 else if (cch->type == CMS_CERTCHOICE_V2ACERT)
 126                         {
 127                         if (sd->version < 4)
 128                                 sd->version = 4;
 129                         }
 130                 else if (cch->type == CMS_CERTCHOICE_V1ACERT)
 131                         {
 132                         if (sd->version < 3)
 133                                 sd->version = 3;
 134                         }
 135                 }
 136
 137         for (i = 0; i < sk_CMS_RevocationInfoChoice_num(sd->crls); i++)
 138                 {
 139                 rch = sk_CMS_RevocationInfoChoice_value(sd->crls, i);
 140                 if (rch->type == CMS_REVCHOICE_OTHER)
 141                         {
 142                         if (sd->version < 5)
 143                                 sd->version = 5;
 144                         }
 145                 }
 146
 147         if ((OBJ_obj2nid(sd->encapContentInfo->eContentType) != NID_pkcs7_data)
 148                         && (sd->version < 3))
 149                 sd->version = 3;
 150
 151         for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++)
 152                 {
 153                 si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
 154                 if (si->sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
 155                         {
 156                         if (si->version < 3)
 157                                 si->version = 3;
 158                         if (sd->version < 3)
 159                                 sd->version = 3;
 160                         }
 161                 else
 162                         sd->version = 1;
 163                 }
 164
 165         if (sd->version < 1)
 166                 sd->version = 1;
 167
 168         }
 169
 170 /* Copy an existing messageDigest value */
 171
 172 static int cms_copy_messageDigest(CMS_ContentInfo *cms, CMS_SignerInfo *si)
 173         {
 174         STACK_OF(CMS_SignerInfo) *sinfos;
 175         CMS_SignerInfo *sitmp;
 176         int i;
 177         sinfos = CMS_get0_SignerInfos(cms);
 178         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 179                 {
 180                 ASN1_OCTET_STRING *messageDigest;
 181                 sitmp = sk_CMS_SignerInfo_value(sinfos, i);
 182                 if (sitmp == si)
 183                         continue;
 184                 if (CMS_signed_get_attr_count(sitmp) < 0)
 185                         continue;
 186                 if (OBJ_cmp(si->digestAlgorithm->algorithm,
 187                                 sitmp->digestAlgorithm->algorithm))
 188                         continue;
 189                 messageDigest = CMS_signed_get0_data_by_OBJ(sitmp,
 190                                         OBJ_nid2obj(NID_pkcs9_messageDigest),
 191                                         -3, V_ASN1_OCTET_STRING);
 192                 if (!messageDigest)
 193                         {
 194                         CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST,
 195                                 CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 196                         return 0;
 197                         }
 198
 199                 if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 200                                                 V_ASN1_OCTET_STRING,
 201                                                 messageDigest, -1))
 202                         return 1;
 203                 else
 204                         return 0;
 205                 }
 206                 CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST, CMS_R_NO_MATCHING_DIGEST);
 207                 return 0;
 208         }
 209
 210 int cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert, int type)
 211         {
 212         switch(type)
 213                 {
 214                 case CMS_SIGNERINFO_ISSUER_SERIAL:
 215                 sid->d.issuerAndSerialNumber =
 216                         M_ASN1_new_of(CMS_IssuerAndSerialNumber);
 217                 if (!sid->d.issuerAndSerialNumber)
 218                         goto merr;
 219                 if (!X509_NAME_set(&sid->d.issuerAndSerialNumber->issuer,
 220                                         X509_get_issuer_name(cert)))
 221                         goto merr;
 222                 if (!ASN1_STRING_copy(
 223                         sid->d.issuerAndSerialNumber->serialNumber,
 224                                 X509_get_serialNumber(cert)))
 225                         goto merr;
 226                 break;
 227
 228                 case CMS_SIGNERINFO_KEYIDENTIFIER:
 229                 if (!cert->skid)
 230                         {
 231                         CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER,
 232                                         CMS_R_CERTIFICATE_HAS_NO_KEYID);
 233                         return 0;
 234                         }
 235                 sid->d.subjectKeyIdentifier = ASN1_STRING_dup(cert->skid);
 236                 if (!sid->d.subjectKeyIdentifier)
 237                         goto merr;
 238                 break;
 239
 240                 default:
 241                 CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, CMS_R_UNKNOWN_ID);
 242                 return 0;
 243                 }
 244
 245         sid->type = type;
 246
 247         return 1;
 248
 249         merr:
 250         CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, ERR_R_MALLOC_FAILURE);
 251         return 0;
 252
 253         }
 254
 255 int cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier *sid,
 256                                         ASN1_OCTET_STRING **keyid,
 257                                         X509_NAME **issuer, ASN1_INTEGER **sno)
 258         {
 259         if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
 260                 {
 261                 if (issuer)
 262                         *issuer = sid->d.issuerAndSerialNumber->issuer;
 263                 if (sno)
 264                         *sno = sid->d.issuerAndSerialNumber->serialNumber;
 265                 }
 266         else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
 267                 {
 268                 if (keyid)
 269                         *keyid = sid->d.subjectKeyIdentifier;
 270                 }
 271         else
 272                 return 0;
 273         return 1;
 274         }
 275
 276 int cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert)
 277         {
 278         int ret;
 279         if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
 280                 {
 281                 ret = X509_NAME_cmp(sid->d.issuerAndSerialNumber->issuer,
 282                                         X509_get_issuer_name(cert));
 283                 if (ret)
 284                         return ret;
 285                 return ASN1_INTEGER_cmp(sid->d.issuerAndSerialNumber->serialNumber,
 286                                         X509_get_serialNumber(cert));
 287                 }
 288         else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
 289                 {
 290                 X509_check_purpose(cert, -1, -1);
 291                 if (!cert->skid)
 292                         return -1;
 293                 return ASN1_OCTET_STRING_cmp(sid->d.subjectKeyIdentifier,
 294                                                         cert->skid);
 295                 }
 296         else
 297                 return -1;
 298         }
 299
 300 CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms,
 301                         X509 *signer, EVP_PKEY *pk, const EVP_MD *md,
 302                         unsigned int flags)
 303         {
 304         CMS_SignedData *sd;
 305         CMS_SignerInfo *si = NULL;
 306         X509_ALGOR *alg;
 307         int i, type;
 308         if(!X509_check_private_key(signer, pk))
 309                 {
 310                 CMSerr(CMS_F_CMS_ADD1_SIGNER,
 311                         CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 312                 return NULL;
 313                 }
 314         sd = cms_signed_data_init(cms);
 315         if (!sd)
 316                 goto err;
 317         si = M_ASN1_new_of(CMS_SignerInfo);
 318         if (!si)
 319                 goto merr;
 320         X509_check_purpose(signer, -1, -1);
 321
 322         CRYPTO_add(&pk->references, 1, CRYPTO_LOCK_EVP_PKEY);
 323         CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509);
 324
 325         si->pkey = pk;
 326         si->signer = signer;
 327
 328         if (flags & CMS_USE_KEYID)
 329                 {
 330                 si->version = 3;
 331                 if (sd->version < 3)
 332                         sd->version = 3;
 333                 type = CMS_SIGNERINFO_KEYIDENTIFIER;
 334                 }
 335         else
 336                 {
 337                 type = CMS_SIGNERINFO_ISSUER_SERIAL;
 338                 si->version = 1;
 339                 }
 340
 341         if (!cms_set1_SignerIdentifier(si->sid, signer, type))
 342                 goto err;
 343
 344         if (md == NULL)
 345                 {
 346                 int def_nid;
 347                 if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0)
 348                         goto err;
 349                 md = EVP_get_digestbynid(def_nid);
 350                 if (md == NULL)
 351                         {
 352                         CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DEFAULT_DIGEST);
 353                         goto err;
 354                         }
 355                 }
 356
 357         if (!md)
 358                 {
 359                 CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DIGEST_SET);
 360                 goto err;
 361                 }
 362
 363         X509_ALGOR_set_md(si->digestAlgorithm, md);
 364
 365         /* See if digest is present in digestAlgorithms */
 366         for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++)
 367                 {
 368                 ASN1_OBJECT *aoid;
 369                 alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 370                 X509_ALGOR_get0(&aoid, NULL, NULL, alg);
 371                 if (OBJ_obj2nid(aoid) == EVP_MD_type(md))
 372                         break;
 373                 }
 374
 375         if (i == sk_X509_ALGOR_num(sd->digestAlgorithms))
 376                 {
 377                 alg = X509_ALGOR_new();
 378                 if (!alg)
 379                         goto merr;
 380                 X509_ALGOR_set_md(alg, md);
 381                 if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg))
 382                         {
 383                         X509_ALGOR_free(alg);
 384                         goto merr;
 385                         }
 386                 }
 387
 388         if (pk->ameth && pk->ameth->pkey_ctrl)
 389                 {
 390                 i = pk->ameth->pkey_ctrl(pk, ASN1_PKEY_CTRL_CMS_SIGN,
 391                                                 0, si);
 392                 if (i == -2)
 393                         {
 394                         CMSerr(CMS_F_CMS_ADD1_SIGNER,
 395                                 CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 396                         goto err;
 397                         }
 398                 if (i <= 0)
 399                         {
 400                         CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_CTRL_FAILURE);
 401                         goto err;
 402                         }
 403                 }
 404
 405         if (!(flags & CMS_NOATTR))
 406                 {
 407                 /* Initialialize signed attributes strutucture so other
 408                  * attributes such as signing time etc are added later
 409                  * even if we add none here.
 410                  */
 411                 if (!si->signedAttrs)
 412                         {
 413                         si->signedAttrs = sk_X509_ATTRIBUTE_new_null();
 414                         if (!si->signedAttrs)
 415                                 goto merr;
 416                         }
 417
 418                 if (!(flags & CMS_NOSMIMECAP))
 419                         {
 420                         STACK_OF(X509_ALGOR) *smcap = NULL;
 421                         i = CMS_add_standard_smimecap(&smcap);
 422                         if (i)
 423                                 i = CMS_add_smimecap(si, smcap);
 424                         sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 425                         if (!i)
 426                                 goto merr;
 427                         }
 428                 if (flags & CMS_REUSE_DIGEST)
 429                         {
 430                         if (!cms_copy_messageDigest(cms, si))
 431                                 goto err;
 432                         if (!(flags & CMS_PARTIAL) &&
 433                                         !CMS_SignerInfo_sign(si))
 434                                 goto err;
 435                         }
 436                 }
 437
 438         if (!(flags & CMS_NOCERTS))
 439                 {
 440                 /* NB ignore -1 return for duplicate cert */
 441                 if (!CMS_add1_cert(cms, signer))
 442                         goto merr;
 443                 }
 444
 445         if (!sd->signerInfos)
 446                 sd->signerInfos = sk_CMS_SignerInfo_new_null();
 447         if (!sd->signerInfos ||
 448                 !sk_CMS_SignerInfo_push(sd->signerInfos, si))
 449                 goto merr;
 450
 451         return si;
 452
 453         merr:
 454         CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
 455         err:
 456         if (si)
 457                 M_ASN1_free_of(si, CMS_SignerInfo);
 458         return NULL;
 459
 460         }
 461
 462 static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
 463         {
 464         ASN1_TIME *tt;
 465         int r = 0;
 466         if (t)
 467                 tt = t;
 468         else
 469                 tt = X509_gmtime_adj(NULL, 0);
 470
 471         if (!tt)
 472                 goto merr;
 473
 474         if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
 475                                                 tt->type, tt, -1) <= 0)
 476                 goto merr;
 477
 478         r = 1;
 479
 480         merr:
 481
 482         if (!t)
 483                 ASN1_TIME_free(tt);
 484
 485         if (!r)
 486                 CMSerr(CMS_F_CMS_ADD1_SIGNINGTIME, ERR_R_MALLOC_FAILURE);
 487
 488         return r;
 489
 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 static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
 620                                         CMS_SignerInfo *si, BIO *chain)
 621         {
 622         EVP_MD_CTX mctx;
 623         int r = 0;
 624         EVP_MD_CTX_init(&mctx);
 625
 626
 627         if (!si->pkey)
 628                 {
 629                 CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_NO_PRIVATE_KEY);
 630                 return 0;
 631                 }
 632
 633         if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
 634                 goto err;
 635
 636         /* If any signed attributes calculate and add messageDigest attribute */
 637
 638         if (CMS_signed_get_attr_count(si) >= 0)
 639                 {
 640                 ASN1_OBJECT *ctype =
 641                         cms->d.signedData->encapContentInfo->eContentType;
 642                 unsigned char md[EVP_MAX_MD_SIZE];
 643                 unsigned int mdlen;
 644                 if (!EVP_DigestFinal_ex(&mctx, md, &mdlen))
 645                         goto err;
 646                 if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 647                                                 V_ASN1_OCTET_STRING,
 648                                                 md, mdlen))
 649                         goto err;
 650                 /* Copy content type across */
 651                 if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
 652                                         V_ASN1_OBJECT, ctype, -1) <= 0)
 653                         goto err;
 654                 if (!CMS_SignerInfo_sign(si))
 655                         goto err;
 656                 }
 657         else
 658                 {
 659                 unsigned char *sig;
 660                 unsigned int siglen;
 661                 sig = OPENSSL_malloc(EVP_PKEY_size(si->pkey));
 662                 if (!sig)
 663                         {
 664                         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
 665                                         ERR_R_MALLOC_FAILURE);
 666                         goto err;
 667                         }
 668                 if (!EVP_SignFinal(&mctx, sig, &siglen, si->pkey))
 669                         {
 670                         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
 671                                         CMS_R_SIGNFINAL_ERROR);
 672                         OPENSSL_free(sig);
 673                         goto err;
 674                         }
 675                 ASN1_STRING_set0(si->signature, sig, siglen);
 676                 }
 677
 678         r = 1;
 679
 680         err:
 681         EVP_MD_CTX_cleanup(&mctx);
 682         return r;
 683
 684         }
 685
 686 int cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
 687         {
 688         STACK_OF(CMS_SignerInfo) *sinfos;
 689         CMS_SignerInfo *si;
 690         int i;
 691         sinfos = CMS_get0_SignerInfos(cms);
 692         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 693                 {
 694                 si = sk_CMS_SignerInfo_value(sinfos, i);
 695                 if (!cms_SignerInfo_content_sign(cms, si, chain))
 696                         return 0;
 697                 }
 698         cms->d.signedData->encapContentInfo->partial = 0;
 699         return 1;
 700         }
 701
 702 int CMS_SignerInfo_sign(CMS_SignerInfo *si)
 703         {
 704         EVP_MD_CTX mctx;
 705         EVP_PKEY_CTX *pctx;
 706         unsigned char *abuf = NULL;
 707         int alen;
 708         size_t siglen;
 709         const EVP_MD *md = NULL;
 710
 711         md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 712         if (md == NULL)
 713                 return 0;
 714
 715         EVP_MD_CTX_init(&mctx);
 716
 717         if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0)
 718                 {
 719                 if (!cms_add1_signingTime(si, NULL))
 720                         goto err;
 721                 }
 722
 723         if (EVP_DigestSignInit(&mctx, &pctx, md, NULL, si->pkey) <= 0)
 724                 goto err;
 725
 726         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 727                                 EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0)
 728                 {
 729                 CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 730                 goto err;
 731                 }
 732
 733         alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs,&abuf,
 734                                 ASN1_ITEM_rptr(CMS_Attributes_Sign));
 735         if(!abuf)
 736                 goto err;
 737         if (EVP_DigestSignUpdate(&mctx, abuf, alen) <= 0)
 738                 goto err;
 739         if (EVP_DigestSignFinal(&mctx, NULL, &siglen) <= 0)
 740                 goto err;
 741         OPENSSL_free(abuf);
 742         abuf = OPENSSL_malloc(siglen);
 743         if(!abuf)
 744                 goto err;
 745         if (EVP_DigestSignFinal(&mctx, abuf, &siglen) <= 0)
 746                 goto err;
 747
 748         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 749                                 EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0)
 750                 {
 751                 CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 752                 goto err;
 753                 }
 754
 755         EVP_MD_CTX_cleanup(&mctx);
 756
 757         ASN1_STRING_set0(si->signature, abuf, siglen);
 758
 759         return 1;
 760
 761         err:
 762         if (abuf)
 763                 OPENSSL_free(abuf);
 764         EVP_MD_CTX_cleanup(&mctx);
 765         return 0;
 766
 767         }
 768
 769 int CMS_SignerInfo_verify(CMS_SignerInfo *si)
 770         {
 771         EVP_MD_CTX mctx;
 772         EVP_PKEY_CTX *pctx;
 773         unsigned char *abuf = NULL;
 774         int alen, r = -1;
 775         const EVP_MD *md = NULL;
 776
 777         if (!si->pkey)
 778                 {
 779                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_NO_PUBLIC_KEY);
 780                 return -1;
 781                 }
 782
 783         md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 784         if (md == NULL)
 785                 return -1;
 786         EVP_MD_CTX_init(&mctx);
 787         if (EVP_DigestVerifyInit(&mctx, &pctx, md, NULL, si->pkey) <= 0)
 788                 goto err;
 789
 790         alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs,&abuf,
 791                                 ASN1_ITEM_rptr(CMS_Attributes_Verify));
 792         if(!abuf)
 793                 goto err;
 794         r = EVP_DigestVerifyUpdate(&mctx, abuf, alen);
 795         OPENSSL_free(abuf);
 796         if (r <= 0)
 797                 {
 798                 r = -1;
 799                 goto err;
 800                 }
 801         r = EVP_DigestVerifyFinal(&mctx,
 802                         si->signature->data, si->signature->length);
 803         if (r <= 0)
 804                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_VERIFICATION_FAILURE);
 805         err:
 806         EVP_MD_CTX_cleanup(&mctx);
 807         return r;
 808         }
 809
 810 /* Create a chain of digest BIOs from a CMS ContentInfo */
 811
 812 BIO *cms_SignedData_init_bio(CMS_ContentInfo *cms)
 813         {
 814         int i;
 815         CMS_SignedData *sd;
 816         BIO *chain = NULL;
 817         sd = cms_get0_signed(cms);
 818         if (!sd)
 819                 return NULL;
 820         if (cms->d.signedData->encapContentInfo->partial)
 821                 cms_sd_set_version(sd);
 822         for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++)
 823                 {
 824                 X509_ALGOR *digestAlgorithm;
 825                 BIO *mdbio;
 826                 digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 827                 mdbio = cms_DigestAlgorithm_init_bio(digestAlgorithm);
 828                 if (!mdbio)
 829                         goto err;
 830                 if (chain)
 831                          BIO_push(chain, mdbio);
 832                 else
 833                         chain = mdbio;
 834                 }
 835         return chain;
 836         err:
 837         if (chain)
 838                 BIO_free_all(chain);
 839         return NULL;
 840         }
 841
 842 int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
 843         {
 844         ASN1_OCTET_STRING *os = NULL;
 845         EVP_MD_CTX mctx;
 846         int r = -1;
 847         EVP_MD_CTX_init(&mctx);
 848         /* If we have any signed attributes look for messageDigest value */
 849         if (CMS_signed_get_attr_count(si) >= 0)
 850                 {
 851                 os = CMS_signed_get0_data_by_OBJ(si,
 852                                         OBJ_nid2obj(NID_pkcs9_messageDigest),
 853                                         -3, V_ASN1_OCTET_STRING);
 854                 if (!os)
 855                         {
 856                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 857                                 CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 858                         goto err;
 859                         }
 860                 }
 861
 862         if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
 863                 goto err;
 864
 865         /* If messageDigest found compare it */
 866
 867         if (os)
 868                 {
 869                 unsigned char mval[EVP_MAX_MD_SIZE];
 870                 unsigned int mlen;
 871                 if (EVP_DigestFinal_ex(&mctx, mval, &mlen) <= 0)
 872                         {
 873                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 874                                 CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
 875                         goto err;
 876                         }
 877                 if (mlen != (unsigned int)os->length)
 878                         {
 879                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 880                                 CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
 881                         goto err;
 882                         }
 883
 884                 if (memcmp(mval, os->data, mlen))
 885                         {
 886                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 887                                 CMS_R_VERIFICATION_FAILURE);
 888                         r = 0;
 889                         }
 890                 else
 891                         r = 1;
 892                 }
 893         else
 894                 {
 895                 r = EVP_VerifyFinal(&mctx, si->signature->data,
 896                                         si->signature->length, si->pkey);
 897                 if (r <= 0)
 898                         {
 899                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 900                                 CMS_R_VERIFICATION_FAILURE);
 901                         r = 0;
 902                         }
 903                 }
 904
 905         err:
 906         EVP_MD_CTX_cleanup(&mctx);
 907         return r;
 908
 909         }
 910
 911 int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
 912         {
 913         unsigned char *smder = NULL;
 914         int smderlen, r;
 915         smderlen = i2d_X509_ALGORS(algs, &smder);
 916         if (smderlen <= 0)
 917                 return 0;
 918         r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
 919                                         V_ASN1_SEQUENCE, smder, smderlen);
 920         OPENSSL_free(smder);
 921         return r;
 922         }
 923
 924 int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
 925                                 int algnid, int keysize)
 926         {
 927         X509_ALGOR *alg;
 928         ASN1_INTEGER *key = NULL;
 929         if (keysize > 0)
 930                 {
 931                 key = ASN1_INTEGER_new();
 932                 if (!key || !ASN1_INTEGER_set(key, keysize))
 933                         return 0;
 934                 }
 935         alg = X509_ALGOR_new();
 936         if (!alg)
 937                 {
 938                 if (key)
 939                         ASN1_INTEGER_free(key);
 940                 return 0;
 941                 }
 942
 943         X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
 944                                 key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key);
 945         if (!*algs)
 946                 *algs = sk_X509_ALGOR_new_null();
 947         if (!*algs || !sk_X509_ALGOR_push(*algs, alg))
 948                 {
 949                 X509_ALGOR_free(alg);
 950                 return 0;
 951                 }
 952         return 1;
 953         }
 954
 955 /* Check to see if a cipher exists and if so add S/MIME capabilities */
 956
 957 static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
 958         {
 959         if (EVP_get_cipherbynid(nid))
 960                 return CMS_add_simple_smimecap(sk, nid, arg);
 961         return 1;
 962         }
 963
 964 static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
 965         {
 966         if (EVP_get_digestbynid(nid))
 967                 return CMS_add_simple_smimecap(sk, nid, arg);
 968         return 1;
 969         }
 970
 971 int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
 972         {
 973         if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
 974                 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
 975                 || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
 976                 || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
 977                 || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
 978                 || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
 979                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
 980                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
 981                 || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
 982                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
 983                 return 0;
 984         return 1;
 985         }