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
 163                         sd->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 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_PKEY_CTX *pctx = NULL;
 625         EVP_MD_CTX_init(&mctx);
 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         /* Set SignerInfo algortihm details if we used custom parametsr */
 636         if (si->pctx && !cms_sd_asn1_ctrl(si, 0))
 637                 goto err;
 638
 639         /* If any signed attributes calculate and add messageDigest attribute */
 640
 641         if (CMS_signed_get_attr_count(si) >= 0)
 642                 {
 643                 ASN1_OBJECT *ctype =
 644                         cms->d.signedData->encapContentInfo->eContentType;
 645                 unsigned char md[EVP_MAX_MD_SIZE];
 646                 unsigned int mdlen;
 647                 if (!EVP_DigestFinal_ex(&mctx, md, &mdlen))
 648                         goto err;
 649                 if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 650                                                 V_ASN1_OCTET_STRING,
 651                                                 md, mdlen))
 652                         goto err;
 653                 /* Copy content type across */
 654                 if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
 655                                         V_ASN1_OBJECT, ctype, -1) <= 0)
 656                         goto err;
 657                 if (!CMS_SignerInfo_sign(si))
 658                         goto err;
 659                 }
 660         else if (si->pctx)
 661                 {
 662                 unsigned char *sig;
 663                 size_t siglen;
 664                 unsigned char md[EVP_MAX_MD_SIZE];
 665                 unsigned int mdlen;
 666                 pctx = si->pctx;
 667                 if (!EVP_DigestFinal_ex(&mctx, md, &mdlen))
 668                         goto err;
 669                 siglen = EVP_PKEY_size(si->pkey);
 670                 sig = OPENSSL_malloc(siglen);
 671                 if (!sig)
 672                         {
 673                         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
 674                                         ERR_R_MALLOC_FAILURE);
 675                         goto err;
 676                         }
 677                 if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0)
 678                         goto err;
 679                 ASN1_STRING_set0(si->signature, sig, siglen);
 680                 }
 681         else
 682                 {
 683                 unsigned char *sig;
 684                 unsigned int siglen;
 685                 sig = OPENSSL_malloc(EVP_PKEY_size(si->pkey));
 686                 if (!sig)
 687                         {
 688                         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
 689                                         ERR_R_MALLOC_FAILURE);
 690                         goto err;
 691                         }
 692                 if (!EVP_SignFinal(&mctx, sig, &siglen, si->pkey))
 693                         {
 694                         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
 695                                         CMS_R_SIGNFINAL_ERROR);
 696                         OPENSSL_free(sig);
 697                         goto err;
 698                         }
 699                 ASN1_STRING_set0(si->signature, sig, siglen);
 700                 }
 701
 702         r = 1;
 703
 704         err:
 705         EVP_MD_CTX_cleanup(&mctx);
 706         if (pctx)
 707                 EVP_PKEY_CTX_free(pctx);
 708         return r;
 709
 710         }
 711
 712 int cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
 713         {
 714         STACK_OF(CMS_SignerInfo) *sinfos;
 715         CMS_SignerInfo *si;
 716         int i;
 717         sinfos = CMS_get0_SignerInfos(cms);
 718         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 719                 {
 720                 si = sk_CMS_SignerInfo_value(sinfos, i);
 721                 if (!cms_SignerInfo_content_sign(cms, si, chain))
 722                         return 0;
 723                 }
 724         cms->d.signedData->encapContentInfo->partial = 0;
 725         return 1;
 726         }
 727
 728 int CMS_SignerInfo_sign(CMS_SignerInfo *si)
 729         {
 730         EVP_MD_CTX *mctx = &si->mctx;
 731         EVP_PKEY_CTX *pctx;
 732         unsigned char *abuf = NULL;
 733         int alen;
 734         size_t siglen;
 735         const EVP_MD *md = NULL;
 736
 737         md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 738         if (md == NULL)
 739                 return 0;
 740
 741
 742         if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0)
 743                 {
 744                 if (!cms_add1_signingTime(si, NULL))
 745                         goto err;
 746                 }
 747
 748         if (si->pctx)
 749                 pctx = si->pctx;
 750         else
 751                 {
 752                 EVP_MD_CTX_init(mctx);
 753                 if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0)
 754                         goto err;
 755                 }
 756
 757         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 758                                 EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0)
 759                 {
 760                 CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 761                 goto err;
 762                 }
 763
 764         alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs,&abuf,
 765                                 ASN1_ITEM_rptr(CMS_Attributes_Sign));
 766         if(!abuf)
 767                 goto err;
 768         if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
 769                 goto err;
 770         if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
 771                 goto err;
 772         OPENSSL_free(abuf);
 773         abuf = OPENSSL_malloc(siglen);
 774         if(!abuf)
 775                 goto err;
 776         if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
 777                 goto err;
 778
 779         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 780                                 EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0)
 781                 {
 782                 CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 783                 goto err;
 784                 }
 785
 786         EVP_MD_CTX_cleanup(mctx);
 787
 788         ASN1_STRING_set0(si->signature, abuf, siglen);
 789
 790         return 1;
 791
 792         err:
 793         if (abuf)
 794                 OPENSSL_free(abuf);
 795         EVP_MD_CTX_cleanup(mctx);
 796         return 0;
 797
 798         }
 799
 800 int CMS_SignerInfo_verify(CMS_SignerInfo *si)
 801         {
 802         EVP_MD_CTX *mctx = &si->mctx;
 803         unsigned char *abuf = NULL;
 804         int alen, r = -1;
 805         const EVP_MD *md = NULL;
 806
 807         if (!si->pkey)
 808                 {
 809                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_NO_PUBLIC_KEY);
 810                 return -1;
 811                 }
 812
 813         md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 814         if (md == NULL)
 815                 return -1;
 816         EVP_MD_CTX_init(mctx);
 817         if (EVP_DigestVerifyInit(mctx, &si->pctx, md, NULL, si->pkey) <= 0)
 818                 goto err;
 819
 820         if (!cms_sd_asn1_ctrl(si, 1))
 821                 goto err;
 822
 823         alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs,&abuf,
 824                                 ASN1_ITEM_rptr(CMS_Attributes_Verify));
 825         if(!abuf)
 826                 goto err;
 827         r = EVP_DigestVerifyUpdate(mctx, abuf, alen);
 828         OPENSSL_free(abuf);
 829         if (r <= 0)
 830                 {
 831                 r = -1;
 832                 goto err;
 833                 }
 834         r = EVP_DigestVerifyFinal(mctx,
 835                         si->signature->data, si->signature->length);
 836         if (r <= 0)
 837                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_VERIFICATION_FAILURE);
 838         err:
 839         EVP_MD_CTX_cleanup(mctx);
 840         return r;
 841         }
 842
 843 /* Create a chain of digest BIOs from a CMS ContentInfo */
 844
 845 BIO *cms_SignedData_init_bio(CMS_ContentInfo *cms)
 846         {
 847         int i;
 848         CMS_SignedData *sd;
 849         BIO *chain = NULL;
 850         sd = cms_get0_signed(cms);
 851         if (!sd)
 852                 return NULL;
 853         if (cms->d.signedData->encapContentInfo->partial)
 854                 cms_sd_set_version(sd);
 855         for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++)
 856                 {
 857                 X509_ALGOR *digestAlgorithm;
 858                 BIO *mdbio;
 859                 digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 860                 mdbio = cms_DigestAlgorithm_init_bio(digestAlgorithm);
 861                 if (!mdbio)
 862                         goto err;
 863                 if (chain)
 864                          BIO_push(chain, mdbio);
 865                 else
 866                         chain = mdbio;
 867                 }
 868         return chain;
 869         err:
 870         if (chain)
 871                 BIO_free_all(chain);
 872         return NULL;
 873         }
 874
 875 int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
 876         {
 877         ASN1_OCTET_STRING *os = NULL;
 878         EVP_MD_CTX mctx;
 879         EVP_PKEY_CTX *pkctx = NULL;
 880         int r = -1;
 881         unsigned char mval[EVP_MAX_MD_SIZE];
 882         unsigned int mlen;
 883         EVP_MD_CTX_init(&mctx);
 884         /* If we have any signed attributes look for messageDigest value */
 885         if (CMS_signed_get_attr_count(si) >= 0)
 886                 {
 887                 os = CMS_signed_get0_data_by_OBJ(si,
 888                                         OBJ_nid2obj(NID_pkcs9_messageDigest),
 889                                         -3, V_ASN1_OCTET_STRING);
 890                 if (!os)
 891                         {
 892                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 893                                 CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 894                         goto err;
 895                         }
 896                 }
 897
 898         if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
 899                 goto err;
 900
 901         if (EVP_DigestFinal_ex(&mctx, mval, &mlen) <= 0)
 902                 {
 903                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 904                         CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
 905                 goto err;
 906                 }
 907
 908         /* If messageDigest found compare it */
 909
 910         if (os)
 911                 {
 912                 if (mlen != (unsigned int)os->length)
 913                         {
 914                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 915                                 CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
 916                         goto err;
 917                         }
 918
 919                 if (memcmp(mval, os->data, mlen))
 920                         {
 921                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 922                                 CMS_R_VERIFICATION_FAILURE);
 923                         r = 0;
 924                         }
 925                 else
 926                         r = 1;
 927                 }
 928         else
 929                 {
 930                 const EVP_MD *md = EVP_MD_CTX_md(&mctx);
 931                 pkctx = EVP_PKEY_CTX_new(si->pkey, NULL);
 932                 if (EVP_PKEY_verify_init(pkctx) <= 0)
 933                         goto err;
 934                 if (EVP_PKEY_CTX_set_signature_md(pkctx, md) <= 0)
 935                         goto err;
 936                 si->pctx = pkctx;
 937                 if (!cms_sd_asn1_ctrl(si, 1))
 938                         goto err;
 939                 r = EVP_PKEY_verify(pkctx, si->signature->data,
 940                                         si->signature->length,
 941                                         mval, mlen);
 942                 if (r <= 0)
 943                         {
 944                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 945                                 CMS_R_VERIFICATION_FAILURE);
 946                         r = 0;
 947                         }
 948                 }
 949
 950         err:
 951         if (pkctx)
 952                 EVP_PKEY_CTX_free(pkctx);
 953         EVP_MD_CTX_cleanup(&mctx);
 954         return r;
 955
 956         }
 957
 958 int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
 959         {
 960         unsigned char *smder = NULL;
 961         int smderlen, r;
 962         smderlen = i2d_X509_ALGORS(algs, &smder);
 963         if (smderlen <= 0)
 964                 return 0;
 965         r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
 966                                         V_ASN1_SEQUENCE, smder, smderlen);
 967         OPENSSL_free(smder);
 968         return r;
 969         }
 970
 971 int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
 972                                 int algnid, int keysize)
 973         {
 974         X509_ALGOR *alg;
 975         ASN1_INTEGER *key = NULL;
 976         if (keysize > 0)
 977                 {
 978                 key = ASN1_INTEGER_new();
 979                 if (!key || !ASN1_INTEGER_set(key, keysize))
 980                         return 0;
 981                 }
 982         alg = X509_ALGOR_new();
 983         if (!alg)
 984                 {
 985                 if (key)
 986                         ASN1_INTEGER_free(key);
 987                 return 0;
 988                 }
 989
 990         X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
 991                                 key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key);
 992         if (!*algs)
 993                 *algs = sk_X509_ALGOR_new_null();
 994         if (!*algs || !sk_X509_ALGOR_push(*algs, alg))
 995                 {
 996                 X509_ALGOR_free(alg);
 997                 return 0;
 998                 }
 999         return 1;
1000         }
1001
1002 /* Check to see if a cipher exists and if so add S/MIME capabilities */
1003
1004 static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1005         {
1006         if (EVP_get_cipherbynid(nid))
1007                 return CMS_add_simple_smimecap(sk, nid, arg);
1008         return 1;
1009         }
1010
1011 static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1012         {
1013         if (EVP_get_digestbynid(nid))
1014                 return CMS_add_simple_smimecap(sk, nid, arg);
1015         return 1;
1016         }
1017
1018 int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
1019         {
1020         if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
1021                 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
1022                 || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
1023                 || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
1024                 || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
1025                 || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
1026                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
1027                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
1028                 || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
1029                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
1030                 return 0;
1031         return 1;
1032         }