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 static int cms_sd_asn1_ctrl(CMS_SignerInfo *si, int cmd)
 301         {
 302         EVP_PKEY *pkey = si->pkey;
 303         int i;
 304         if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
 305                 return 1;
 306         i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_SIGN, cmd, si);
 307         if (i == -2)
 308                 {
 309                 CMSerr(CMS_F_CMS_SD_ASN1_CTRL,
 310                                 CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 311                 return 0;
 312                 }
 313         if (i <= 0)
 314                 {
 315                 CMSerr(CMS_F_CMS_SD_ASN1_CTRL, CMS_R_CTRL_FAILURE);
 316                 return 0;
 317                 }
 318         return 1;
 319         }
 320
 321 CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms,
 322                         X509 *signer, EVP_PKEY *pk, const EVP_MD *md,
 323                         unsigned int flags)
 324         {
 325         CMS_SignedData *sd;
 326         CMS_SignerInfo *si = NULL;
 327         X509_ALGOR *alg;
 328         int i, type;
 329         if(!X509_check_private_key(signer, pk))
 330                 {
 331                 CMSerr(CMS_F_CMS_ADD1_SIGNER,
 332                         CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 333                 return NULL;
 334                 }
 335         sd = cms_signed_data_init(cms);
 336         if (!sd)
 337                 goto err;
 338         si = M_ASN1_new_of(CMS_SignerInfo);
 339         if (!si)
 340                 goto merr;
 341         X509_check_purpose(signer, -1, -1);
 342
 343         CRYPTO_add(&pk->references, 1, CRYPTO_LOCK_EVP_PKEY);
 344         CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509);
 345
 346         si->pkey = pk;
 347         si->signer = signer;
 348         EVP_MD_CTX_init(&si->mctx);
 349         si->pctx = NULL;
 350
 351         if (flags & CMS_USE_KEYID)
 352                 {
 353                 si->version = 3;
 354                 if (sd->version < 3)
 355                         sd->version = 3;
 356                 type = CMS_SIGNERINFO_KEYIDENTIFIER;
 357                 }
 358         else
 359                 {
 360                 type = CMS_SIGNERINFO_ISSUER_SERIAL;
 361                 si->version = 1;
 362                 }
 363
 364         if (!cms_set1_SignerIdentifier(si->sid, signer, type))
 365                 goto err;
 366
 367         if (md == NULL)
 368                 {
 369                 int def_nid;
 370                 if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0)
 371                         goto err;
 372                 md = EVP_get_digestbynid(def_nid);
 373                 if (md == NULL)
 374                         {
 375                         CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DEFAULT_DIGEST);
 376                         goto err;
 377                         }
 378                 }
 379
 380         if (!md)
 381                 {
 382                 CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DIGEST_SET);
 383                 goto err;
 384                 }
 385
 386         X509_ALGOR_set_md(si->digestAlgorithm, md);
 387
 388         /* See if digest is present in digestAlgorithms */
 389         for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++)
 390                 {
 391                 ASN1_OBJECT *aoid;
 392                 alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 393                 X509_ALGOR_get0(&aoid, NULL, NULL, alg);
 394                 if (OBJ_obj2nid(aoid) == EVP_MD_type(md))
 395                         break;
 396                 }
 397
 398         if (i == sk_X509_ALGOR_num(sd->digestAlgorithms))
 399                 {
 400                 alg = X509_ALGOR_new();
 401                 if (!alg)
 402                         goto merr;
 403                 X509_ALGOR_set_md(alg, md);
 404                 if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg))
 405                         {
 406                         X509_ALGOR_free(alg);
 407                         goto merr;
 408                         }
 409                 }
 410
 411         if (!(flags & CMS_KEY_PARAM) && !cms_sd_asn1_ctrl(si, 0))
 412                 goto err;
 413         if (!(flags & CMS_NOATTR))
 414                 {
 415                 /* Initialialize signed attributes strutucture so other
 416                  * attributes such as signing time etc are added later
 417                  * even if we add none here.
 418                  */
 419                 if (!si->signedAttrs)
 420                         {
 421                         si->signedAttrs = sk_X509_ATTRIBUTE_new_null();
 422                         if (!si->signedAttrs)
 423                                 goto merr;
 424                         }
 425
 426                 if (!(flags & CMS_NOSMIMECAP))
 427                         {
 428                         STACK_OF(X509_ALGOR) *smcap = NULL;
 429                         i = CMS_add_standard_smimecap(&smcap);
 430                         if (i)
 431                                 i = CMS_add_smimecap(si, smcap);
 432                         sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 433                         if (!i)
 434                                 goto merr;
 435                         }
 436                 if (flags & CMS_REUSE_DIGEST)
 437                         {
 438                         if (!cms_copy_messageDigest(cms, si))
 439                                 goto err;
 440                         if (!(flags & (CMS_PARTIAL|CMS_KEY_PARAM)) &&
 441                                         !CMS_SignerInfo_sign(si))
 442                                 goto err;
 443                         }
 444                 }
 445
 446         if (!(flags & CMS_NOCERTS))
 447                 {
 448                 /* NB ignore -1 return for duplicate cert */
 449                 if (!CMS_add1_cert(cms, signer))
 450                         goto merr;
 451                 }
 452
 453         if (flags & CMS_KEY_PARAM)
 454                 {
 455                 if (flags & CMS_NOATTR)
 456                         {
 457                         si->pctx = EVP_PKEY_CTX_new(si->pkey, NULL);
 458                         if (!si->pctx)
 459                                 goto err;
 460                         if (EVP_PKEY_sign_init(si->pctx) <= 0)
 461                                 goto err;
 462                         if (EVP_PKEY_CTX_set_signature_md(si->pctx, md) <= 0)
 463                                 goto err;
 464                         }
 465                 else if (EVP_DigestSignInit(&si->mctx, &si->pctx, md, NULL, pk) <= 0)
 466                         goto err;
 467                 }
 468
 469         if (!sd->signerInfos)
 470                 sd->signerInfos = sk_CMS_SignerInfo_new_null();
 471         if (!sd->signerInfos ||
 472                 !sk_CMS_SignerInfo_push(sd->signerInfos, si))
 473                 goto merr;
 474
 475         return si;
 476
 477         merr:
 478         CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
 479         err:
 480         if (si)
 481                 M_ASN1_free_of(si, CMS_SignerInfo);
 482         return NULL;
 483
 484         }
 485
 486 static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
 487         {
 488         ASN1_TIME *tt;
 489         int r = 0;
 490         if (t)
 491                 tt = t;
 492         else
 493                 tt = X509_gmtime_adj(NULL, 0);
 494
 495         if (!tt)
 496                 goto merr;
 497
 498         if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
 499                                                 tt->type, tt, -1) <= 0)
 500                 goto merr;
 501
 502         r = 1;
 503
 504         merr:
 505
 506         if (!t)
 507                 ASN1_TIME_free(tt);
 508
 509         if (!r)
 510                 CMSerr(CMS_F_CMS_ADD1_SIGNINGTIME, ERR_R_MALLOC_FAILURE);
 511
 512         return r;
 513
 514         }
 515
 516 EVP_PKEY_CTX *CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo *si)
 517         {
 518         return si->pctx;
 519         }
 520
 521 EVP_MD_CTX *CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo *si)
 522         {
 523         return &si->mctx;
 524         }
 525
 526 STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
 527         {
 528         CMS_SignedData *sd;
 529         sd = cms_get0_signed(cms);
 530         if (!sd)
 531                 return NULL;
 532         return sd->signerInfos;
 533         }
 534
 535 STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms)
 536         {
 537         STACK_OF(X509) *signers = NULL;
 538         STACK_OF(CMS_SignerInfo) *sinfos;
 539         CMS_SignerInfo *si;
 540         int i;
 541         sinfos = CMS_get0_SignerInfos(cms);
 542         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 543                 {
 544                 si = sk_CMS_SignerInfo_value(sinfos, i);
 545                 if (si->signer)
 546                         {
 547                         if (!signers)
 548                                 {
 549                                 signers = sk_X509_new_null();
 550                                 if (!signers)
 551                                         return NULL;
 552                                 }
 553                         if (!sk_X509_push(signers, si->signer))
 554                                 {
 555                                 sk_X509_free(signers);
 556                                 return NULL;
 557                                 }
 558                         }
 559                 }
 560         return signers;
 561         }
 562
 563 void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
 564         {
 565         if (signer)
 566                 {
 567                 CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509);
 568                 if (si->pkey)
 569                         EVP_PKEY_free(si->pkey);
 570                 si->pkey = X509_get_pubkey(signer);
 571                 }
 572         if (si->signer)
 573                 X509_free(si->signer);
 574         si->signer = signer;
 575         }
 576
 577 int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si,
 578                                         ASN1_OCTET_STRING **keyid,
 579                                         X509_NAME **issuer, ASN1_INTEGER **sno)
 580         {
 581         return cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
 582         }
 583
 584 int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
 585         {
 586         return cms_SignerIdentifier_cert_cmp(si->sid, cert);
 587         }
 588
 589 int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
 590                                 unsigned int flags)
 591         {
 592         CMS_SignedData *sd;
 593         CMS_SignerInfo *si;
 594         CMS_CertificateChoices *cch;
 595         STACK_OF(CMS_CertificateChoices) *certs;
 596         X509 *x;
 597         int i, j;
 598         int ret = 0;
 599         sd = cms_get0_signed(cms);
 600         if (!sd)
 601                 return -1;
 602         certs = sd->certificates;
 603         for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++)
 604                 {
 605                 si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
 606                 if (si->signer)
 607                         continue;
 608
 609                 for (j = 0; j < sk_X509_num(scerts); j++)
 610                         {
 611                         x = sk_X509_value(scerts, j);
 612                         if (CMS_SignerInfo_cert_cmp(si, x) == 0)
 613                                 {
 614                                 CMS_SignerInfo_set1_signer_cert(si, x);
 615                                 ret++;
 616                                 break;
 617                                 }
 618                         }
 619
 620                 if (si->signer || (flags & CMS_NOINTERN))
 621                         continue;
 622
 623                 for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++)
 624                         {
 625                         cch = sk_CMS_CertificateChoices_value(certs, j);
 626                         if (cch->type != 0)
 627                                 continue;
 628                         x = cch->d.certificate;
 629                         if (CMS_SignerInfo_cert_cmp(si, x) == 0)
 630                                 {
 631                                 CMS_SignerInfo_set1_signer_cert(si, x);
 632                                 ret++;
 633                                 break;
 634                                 }
 635                         }
 636                 }
 637         return ret;
 638         }
 639
 640 void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk, X509 **signer,
 641                                         X509_ALGOR **pdig, X509_ALGOR **psig)
 642         {
 643         if (pk)
 644                 *pk = si->pkey;
 645         if (signer)
 646                 *signer = si->signer;
 647         if (pdig)
 648                 *pdig = si->digestAlgorithm;
 649         if (psig)
 650                 *psig = si->signatureAlgorithm;
 651         }
 652
 653 static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
 654                                         CMS_SignerInfo *si, BIO *chain)
 655         {
 656         EVP_MD_CTX mctx;
 657         int r = 0;
 658         EVP_PKEY_CTX *pctx = NULL;
 659         EVP_MD_CTX_init(&mctx);
 660
 661         if (!si->pkey)
 662                 {
 663                 CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_NO_PRIVATE_KEY);
 664                 return 0;
 665                 }
 666
 667         if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
 668                 goto err;
 669         /* Set SignerInfo algortihm details if we used custom parametsr */
 670         if (si->pctx && !cms_sd_asn1_ctrl(si, 0))
 671                 goto err;
 672
 673         /* If any signed attributes calculate and add messageDigest attribute */
 674
 675         if (CMS_signed_get_attr_count(si) >= 0)
 676                 {
 677                 ASN1_OBJECT *ctype =
 678                         cms->d.signedData->encapContentInfo->eContentType;
 679                 unsigned char md[EVP_MAX_MD_SIZE];
 680                 unsigned int mdlen;
 681                 if (!EVP_DigestFinal_ex(&mctx, md, &mdlen))
 682                         goto err;
 683                 if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 684                                                 V_ASN1_OCTET_STRING,
 685                                                 md, mdlen))
 686                         goto err;
 687                 /* Copy content type across */
 688                 if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
 689                                         V_ASN1_OBJECT, ctype, -1) <= 0)
 690                         goto err;
 691                 if (!CMS_SignerInfo_sign(si))
 692                         goto err;
 693                 }
 694         else if (si->pctx)
 695                 {
 696                 unsigned char *sig;
 697                 size_t siglen;
 698                 unsigned char md[EVP_MAX_MD_SIZE];
 699                 unsigned int mdlen;
 700                 pctx = si->pctx;
 701                 if (!EVP_DigestFinal_ex(&mctx, md, &mdlen))
 702                         goto err;
 703                 siglen = EVP_PKEY_size(si->pkey);
 704                 sig = OPENSSL_malloc(siglen);
 705                 if (!sig)
 706                         {
 707                         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
 708                                         ERR_R_MALLOC_FAILURE);
 709                         goto err;
 710                         }
 711                 if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0)
 712                         goto err;
 713                 ASN1_STRING_set0(si->signature, sig, siglen);
 714                 }
 715         else
 716                 {
 717                 unsigned char *sig;
 718                 unsigned int siglen;
 719                 sig = OPENSSL_malloc(EVP_PKEY_size(si->pkey));
 720                 if (!sig)
 721                         {
 722                         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
 723                                         ERR_R_MALLOC_FAILURE);
 724                         goto err;
 725                         }
 726                 if (!EVP_SignFinal(&mctx, sig, &siglen, si->pkey))
 727                         {
 728                         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
 729                                         CMS_R_SIGNFINAL_ERROR);
 730                         OPENSSL_free(sig);
 731                         goto err;
 732                         }
 733                 ASN1_STRING_set0(si->signature, sig, siglen);
 734                 }
 735
 736         r = 1;
 737
 738         err:
 739         EVP_MD_CTX_cleanup(&mctx);
 740         if (pctx)
 741                 EVP_PKEY_CTX_free(pctx);
 742         return r;
 743
 744         }
 745
 746 int cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
 747         {
 748         STACK_OF(CMS_SignerInfo) *sinfos;
 749         CMS_SignerInfo *si;
 750         int i;
 751         sinfos = CMS_get0_SignerInfos(cms);
 752         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 753                 {
 754                 si = sk_CMS_SignerInfo_value(sinfos, i);
 755                 if (!cms_SignerInfo_content_sign(cms, si, chain))
 756                         return 0;
 757                 }
 758         cms->d.signedData->encapContentInfo->partial = 0;
 759         return 1;
 760         }
 761
 762 int CMS_SignerInfo_sign(CMS_SignerInfo *si)
 763         {
 764         EVP_MD_CTX *mctx = &si->mctx;
 765         EVP_PKEY_CTX *pctx;
 766         unsigned char *abuf = NULL;
 767         int alen;
 768         size_t siglen;
 769         const EVP_MD *md = NULL;
 770
 771         md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 772         if (md == NULL)
 773                 return 0;
 774
 775
 776         if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0)
 777                 {
 778                 if (!cms_add1_signingTime(si, NULL))
 779                         goto err;
 780                 }
 781
 782         if (si->pctx)
 783                 pctx = si->pctx;
 784         else
 785                 {
 786                 EVP_MD_CTX_init(mctx);
 787                 if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0)
 788                         goto err;
 789                 }
 790
 791         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 792                                 EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0)
 793                 {
 794                 CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 795                 goto err;
 796                 }
 797
 798         alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs,&abuf,
 799                                 ASN1_ITEM_rptr(CMS_Attributes_Sign));
 800         if(!abuf)
 801                 goto err;
 802         if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
 803                 goto err;
 804         if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
 805                 goto err;
 806         OPENSSL_free(abuf);
 807         abuf = OPENSSL_malloc(siglen);
 808         if(!abuf)
 809                 goto err;
 810         if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
 811                 goto err;
 812
 813         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 814                                 EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0)
 815                 {
 816                 CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 817                 goto err;
 818                 }
 819
 820         EVP_MD_CTX_cleanup(mctx);
 821
 822         ASN1_STRING_set0(si->signature, abuf, siglen);
 823
 824         return 1;
 825
 826         err:
 827         if (abuf)
 828                 OPENSSL_free(abuf);
 829         EVP_MD_CTX_cleanup(mctx);
 830         return 0;
 831
 832         }
 833
 834 int CMS_SignerInfo_verify(CMS_SignerInfo *si)
 835         {
 836         EVP_MD_CTX *mctx = &si->mctx;
 837         unsigned char *abuf = NULL;
 838         int alen, r = -1;
 839         const EVP_MD *md = NULL;
 840
 841         if (!si->pkey)
 842                 {
 843                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_NO_PUBLIC_KEY);
 844                 return -1;
 845                 }
 846
 847         md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 848         if (md == NULL)
 849                 return -1;
 850         EVP_MD_CTX_init(mctx);
 851         if (EVP_DigestVerifyInit(mctx, &si->pctx, md, NULL, si->pkey) <= 0)
 852                 goto err;
 853
 854         if (!cms_sd_asn1_ctrl(si, 1))
 855                 goto err;
 856
 857         alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs,&abuf,
 858                                 ASN1_ITEM_rptr(CMS_Attributes_Verify));
 859         if(!abuf)
 860                 goto err;
 861         r = EVP_DigestVerifyUpdate(mctx, abuf, alen);
 862         OPENSSL_free(abuf);
 863         if (r <= 0)
 864                 {
 865                 r = -1;
 866                 goto err;
 867                 }
 868         r = EVP_DigestVerifyFinal(mctx,
 869                         si->signature->data, si->signature->length);
 870         if (r <= 0)
 871                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_VERIFICATION_FAILURE);
 872         err:
 873         EVP_MD_CTX_cleanup(mctx);
 874         return r;
 875         }
 876
 877 /* Create a chain of digest BIOs from a CMS ContentInfo */
 878
 879 BIO *cms_SignedData_init_bio(CMS_ContentInfo *cms)
 880         {
 881         int i;
 882         CMS_SignedData *sd;
 883         BIO *chain = NULL;
 884         sd = cms_get0_signed(cms);
 885         if (!sd)
 886                 return NULL;
 887         if (cms->d.signedData->encapContentInfo->partial)
 888                 cms_sd_set_version(sd);
 889         for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++)
 890                 {
 891                 X509_ALGOR *digestAlgorithm;
 892                 BIO *mdbio;
 893                 digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 894                 mdbio = cms_DigestAlgorithm_init_bio(digestAlgorithm);
 895                 if (!mdbio)
 896                         goto err;
 897                 if (chain)
 898                          BIO_push(chain, mdbio);
 899                 else
 900                         chain = mdbio;
 901                 }
 902         return chain;
 903         err:
 904         if (chain)
 905                 BIO_free_all(chain);
 906         return NULL;
 907         }
 908
 909 int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
 910         {
 911         ASN1_OCTET_STRING *os = NULL;
 912         EVP_MD_CTX mctx;
 913         EVP_PKEY_CTX *pkctx = NULL;
 914         int r = -1;
 915         unsigned char mval[EVP_MAX_MD_SIZE];
 916         unsigned int mlen;
 917         EVP_MD_CTX_init(&mctx);
 918         /* If we have any signed attributes look for messageDigest value */
 919         if (CMS_signed_get_attr_count(si) >= 0)
 920                 {
 921                 os = CMS_signed_get0_data_by_OBJ(si,
 922                                         OBJ_nid2obj(NID_pkcs9_messageDigest),
 923                                         -3, V_ASN1_OCTET_STRING);
 924                 if (!os)
 925                         {
 926                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 927                                 CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 928                         goto err;
 929                         }
 930                 }
 931
 932         if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
 933                 goto err;
 934
 935         if (EVP_DigestFinal_ex(&mctx, mval, &mlen) <= 0)
 936                 {
 937                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 938                         CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
 939                 goto err;
 940                 }
 941
 942         /* If messageDigest found compare it */
 943
 944         if (os)
 945                 {
 946                 if (mlen != (unsigned int)os->length)
 947                         {
 948                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 949                                 CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
 950                         goto err;
 951                         }
 952
 953                 if (memcmp(mval, os->data, mlen))
 954                         {
 955                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 956                                 CMS_R_VERIFICATION_FAILURE);
 957                         r = 0;
 958                         }
 959                 else
 960                         r = 1;
 961                 }
 962         else
 963                 {
 964                 const EVP_MD *md = EVP_MD_CTX_md(&mctx);
 965                 pkctx = EVP_PKEY_CTX_new(si->pkey, NULL);
 966                 if (EVP_PKEY_verify_init(pkctx) <= 0)
 967                         goto err;
 968                 if (EVP_PKEY_CTX_set_signature_md(pkctx, md) <= 0)
 969                         goto err;
 970                 si->pctx = pkctx;
 971                 if (!cms_sd_asn1_ctrl(si, 1))
 972                         goto err;
 973                 r = EVP_PKEY_verify(pkctx, si->signature->data,
 974                                         si->signature->length,
 975                                         mval, mlen);
 976                 if (r <= 0)
 977                         {
 978                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 979                                 CMS_R_VERIFICATION_FAILURE);
 980                         r = 0;
 981                         }
 982                 }
 983
 984         err:
 985         if (pkctx)
 986                 EVP_PKEY_CTX_free(pkctx);
 987         EVP_MD_CTX_cleanup(&mctx);
 988         return r;
 989
 990         }
 991
 992 int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
 993         {
 994         unsigned char *smder = NULL;
 995         int smderlen, r;
 996         smderlen = i2d_X509_ALGORS(algs, &smder);
 997         if (smderlen <= 0)
 998                 return 0;
 999         r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
1000                                         V_ASN1_SEQUENCE, smder, smderlen);
1001         OPENSSL_free(smder);
1002         return r;
1003         }
1004
1005 int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
1006                                 int algnid, int keysize)
1007         {
1008         X509_ALGOR *alg;
1009         ASN1_INTEGER *key = NULL;
1010         if (keysize > 0)
1011                 {
1012                 key = ASN1_INTEGER_new();
1013                 if (!key || !ASN1_INTEGER_set(key, keysize))
1014                         return 0;
1015                 }
1016         alg = X509_ALGOR_new();
1017         if (!alg)
1018                 {
1019                 if (key)
1020                         ASN1_INTEGER_free(key);
1021                 return 0;
1022                 }
1023
1024         X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
1025                                 key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key);
1026         if (!*algs)
1027                 *algs = sk_X509_ALGOR_new_null();
1028         if (!*algs || !sk_X509_ALGOR_push(*algs, alg))
1029                 {
1030                 X509_ALGOR_free(alg);
1031                 return 0;
1032                 }
1033         return 1;
1034         }
1035
1036 /* Check to see if a cipher exists and if so add S/MIME capabilities */
1037
1038 static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1039         {
1040         if (EVP_get_cipherbynid(nid))
1041                 return CMS_add_simple_smimecap(sk, nid, arg);
1042         return 1;
1043         }
1044
1045 static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1046         {
1047         if (EVP_get_digestbynid(nid))
1048                 return CMS_add_simple_smimecap(sk, nid, arg);
1049         return 1;
1050         }
1051
1052 int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
1053         {
1054         if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
1055                 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
1056                 || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
1057                 || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
1058                 || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
1059                 || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
1060                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
1061                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
1062                 || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
1063                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
1064                 return 0;
1065         return 1;
1066         }