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                 ASN1_OBJECT_free(cms->contentType);
  91                 cms->contentType = OBJ_nid2obj(NID_pkcs7_signed);
  92                 return cms->d.signedData;
  93                 }
  94         return cms_get0_signed(cms);
  95         }
  96
  97 /* Just initialize SignedData e.g. for certs only structure */
  98
  99 int CMS_SignedData_init(CMS_ContentInfo *cms)
 100         {
 101         if (cms_signed_data_init(cms))
 102                 return 1;
 103         else
 104                 return 0;
 105         }
 106
 107 /* Check structures and fixup version numbers (if necessary) */
 108
 109 static void cms_sd_set_version(CMS_SignedData *sd)
 110         {
 111         int i;
 112         CMS_CertificateChoices *cch;
 113         CMS_RevocationInfoChoice *rch;
 114         CMS_SignerInfo *si;
 115
 116         for (i = 0; i < sk_CMS_CertificateChoices_num(sd->certificates); i++)
 117                 {
 118                 cch = sk_CMS_CertificateChoices_value(sd->certificates, i);
 119                 if (cch->type == CMS_CERTCHOICE_OTHER)
 120                         {
 121                         if (sd->version < 5)
 122                                 sd->version = 5;
 123                         }
 124                 else if (cch->type == CMS_CERTCHOICE_V2ACERT)
 125                         {
 126                         if (sd->version < 4)
 127                                 sd->version = 4;
 128                         }
 129                 else if (cch->type == CMS_CERTCHOICE_V1ACERT)
 130                         {
 131                         if (sd->version < 3)
 132                                 sd->version = 3;
 133                         }
 134                 }
 135
 136         for (i = 0; i < sk_CMS_RevocationInfoChoice_num(sd->crls); i++)
 137                 {
 138                 rch = sk_CMS_RevocationInfoChoice_value(sd->crls, i);
 139                 if (rch->type == CMS_REVCHOICE_OTHER)
 140                         {
 141                         if (sd->version < 5)
 142                                 sd->version = 5;
 143                         }
 144                 }
 145
 146         if ((OBJ_obj2nid(sd->encapContentInfo->eContentType) != NID_pkcs7_data)
 147                         && (sd->version < 3))
 148                 sd->version = 3;
 149
 150         for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++)
 151                 {
 152                 si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
 153                 if (si->sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
 154                         {
 155                         if (si->version < 3)
 156                                 si->version = 3;
 157                         if (sd->version < 3)
 158                                 sd->version = 3;
 159                         }
 160                 else
 161                         sd->version = 1;
 162                 }
 163
 164         if (sd->version < 1)
 165                 sd->version = 1;
 166
 167         }
 168
 169 /* Copy an existing messageDigest value */
 170
 171 static int cms_copy_messageDigest(CMS_ContentInfo *cms, CMS_SignerInfo *si)
 172         {
 173         STACK_OF(CMS_SignerInfo) *sinfos;
 174         CMS_SignerInfo *sitmp;
 175         int i;
 176         sinfos = CMS_get0_SignerInfos(cms);
 177         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 178                 {
 179                 ASN1_OCTET_STRING *messageDigest;
 180                 sitmp = sk_CMS_SignerInfo_value(sinfos, i);
 181                 if (sitmp == si)
 182                         continue;
 183                 if (CMS_signed_get_attr_count(sitmp) < 0)
 184                         continue;
 185                 if (OBJ_cmp(si->digestAlgorithm->algorithm,
 186                                 sitmp->digestAlgorithm->algorithm))
 187                         continue;
 188                 messageDigest = CMS_signed_get0_data_by_OBJ(sitmp,
 189                                         OBJ_nid2obj(NID_pkcs9_messageDigest),
 190                                         -3, V_ASN1_OCTET_STRING);
 191                 if (!messageDigest)
 192                         {
 193                         CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST,
 194                                 CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 195                         return 0;
 196                         }
 197
 198                 if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 199                                                 V_ASN1_OCTET_STRING,
 200                                                 messageDigest, -1))
 201                         return 1;
 202                 else
 203                         return 0;
 204                 }
 205                 CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST, CMS_R_NO_MATCHING_DIGEST);
 206                 return 0;
 207         }
 208
 209 int cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert, int type)
 210         {
 211         switch(type)
 212                 {
 213                 case CMS_SIGNERINFO_ISSUER_SERIAL:
 214                 sid->d.issuerAndSerialNumber =
 215                         M_ASN1_new_of(CMS_IssuerAndSerialNumber);
 216                 if (!sid->d.issuerAndSerialNumber)
 217                         goto merr;
 218                 if (!X509_NAME_set(&sid->d.issuerAndSerialNumber->issuer,
 219                                         X509_get_issuer_name(cert)))
 220                         goto merr;
 221                 if (!ASN1_STRING_copy(
 222                         sid->d.issuerAndSerialNumber->serialNumber,
 223                                 X509_get_serialNumber(cert)))
 224                         goto merr;
 225                 break;
 226
 227                 case CMS_SIGNERINFO_KEYIDENTIFIER:
 228                 sid->d.subjectKeyIdentifier = ASN1_STRING_dup(cert->skid);
 229                 if (!sid->d.subjectKeyIdentifier)
 230                         goto merr;
 231                 break;
 232
 233                 default:
 234                 CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, CMS_R_UNKNOWN_ID);
 235                 return 0;
 236                 }
 237
 238         sid->type = type;
 239
 240         return 1;
 241
 242         merr:
 243         CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, ERR_R_MALLOC_FAILURE);
 244         return 0;
 245
 246         }
 247
 248 int cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier *sid,
 249                                         ASN1_OCTET_STRING **keyid,
 250                                         X509_NAME **issuer, ASN1_INTEGER **sno)
 251         {
 252         if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
 253                 {
 254                 if (issuer)
 255                         *issuer = sid->d.issuerAndSerialNumber->issuer;
 256                 if (sno)
 257                         *sno = sid->d.issuerAndSerialNumber->serialNumber;
 258                 }
 259         else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
 260                 {
 261                 if (keyid)
 262                         *keyid = sid->d.subjectKeyIdentifier;
 263                 }
 264         else
 265                 return 0;
 266         return 1;
 267         }
 268
 269 int cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert)
 270         {
 271         int ret;
 272         if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
 273                 {
 274                 ret = X509_NAME_cmp(sid->d.issuerAndSerialNumber->issuer,
 275                                         X509_get_issuer_name(cert));
 276                 if (ret)
 277                         return ret;
 278                 return ASN1_INTEGER_cmp(sid->d.issuerAndSerialNumber->serialNumber,
 279                                         X509_get_serialNumber(cert));
 280                 }
 281         else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
 282                 {
 283                 X509_check_purpose(cert, -1, -1);
 284                 if (!cert->skid)
 285                         return -1;
 286                 return ASN1_OCTET_STRING_cmp(sid->d.subjectKeyIdentifier,
 287                                                         cert->skid);
 288                 }
 289         else
 290                 return -1;
 291         }
 292
 293 CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms,
 294                         X509 *signer, EVP_PKEY *pk, const EVP_MD *md,
 295                         unsigned int flags)
 296         {
 297         CMS_SignedData *sd;
 298         CMS_SignerInfo *si = NULL;
 299         X509_ALGOR *alg;
 300         int i, type;
 301         if(!X509_check_private_key(signer, pk))
 302                 {
 303                 CMSerr(CMS_F_CMS_ADD1_SIGNER,
 304                         CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 305                 return NULL;
 306                 }
 307         sd = cms_signed_data_init(cms);
 308         if (!sd)
 309                 goto err;
 310         si = M_ASN1_new_of(CMS_SignerInfo);
 311         if (!si)
 312                 goto merr;
 313         X509_check_purpose(signer, -1, -1);
 314
 315         CRYPTO_add(&pk->references, 1, CRYPTO_LOCK_EVP_PKEY);
 316         CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509);
 317
 318         si->pkey = pk;
 319         si->signer = signer;
 320
 321         if (flags & CMS_USE_KEYID)
 322                 {
 323                 si->version = 3;
 324                 if (sd->version < 3)
 325                         sd->version = 3;
 326                 type = CMS_SIGNERINFO_KEYIDENTIFIER;
 327                 }
 328         else
 329                 {
 330                 type = CMS_SIGNERINFO_ISSUER_SERIAL;
 331                 si->version = 1;
 332                 }
 333
 334         if (!cms_set1_SignerIdentifier(si->sid, signer, type))
 335                 goto err;
 336
 337         if (md == NULL)
 338                 {
 339                 int def_nid;
 340                 if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0)
 341                         goto err;
 342                 md = EVP_get_digestbynid(def_nid);
 343                 if (md == NULL)
 344                         {
 345                         CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DEFAULT_DIGEST);
 346                         goto err;
 347                         }
 348                 }
 349
 350         if (!md)
 351                 {
 352                 CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DIGEST_SET);
 353                 goto err;
 354                 }
 355
 356         cms_DigestAlgorithm_set(si->digestAlgorithm, md);
 357
 358         /* See if digest is present in digestAlgorithms */
 359         for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++)
 360                 {
 361                 ASN1_OBJECT *aoid;
 362                 alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 363                 X509_ALGOR_get0(&aoid, NULL, NULL, alg);
 364                 if (OBJ_obj2nid(aoid) == EVP_MD_type(md))
 365                         break;
 366                 }
 367
 368         if (i == sk_X509_ALGOR_num(sd->digestAlgorithms))
 369                 {
 370                 alg = X509_ALGOR_new();
 371                 if (!alg)
 372                         goto merr;
 373                 cms_DigestAlgorithm_set(alg, md);
 374                 if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg))
 375                         {
 376                         X509_ALGOR_free(alg);
 377                         goto merr;
 378                         }
 379                 }
 380
 381         if (pk->ameth && pk->ameth->pkey_ctrl)
 382                 {
 383                 i = pk->ameth->pkey_ctrl(pk, ASN1_PKEY_CTRL_CMS_SIGN,
 384                                                 0, si);
 385                 if (i == -2)
 386                         {
 387                         CMSerr(CMS_F_CMS_ADD1_SIGNER,
 388                                 CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 389                         goto err;
 390                         }
 391                 if (i <= 0)
 392                         {
 393                         CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_CTRL_FAILURE);
 394                         goto err;
 395                         }
 396                 }
 397
 398         if (!(flags & CMS_NOATTR))
 399                 {
 400                 /* Copy content type across */
 401                 ASN1_OBJECT *ctype =
 402                                 OBJ_dup(sd->encapContentInfo->eContentType);
 403                 if (!ctype)
 404                         goto merr;
 405                 i = CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
 406                                                 V_ASN1_OBJECT, ctype, -1);
 407                 ASN1_OBJECT_free(ctype);
 408                 if (i <= 0)
 409                         goto merr;
 410                 if (!(flags & CMS_NOSMIMECAP))
 411                         {
 412                         STACK_OF(X509_ALGOR) *smcap = NULL;
 413                         i = CMS_add_standard_smimecap(&smcap);
 414                         if (i)
 415                                 i = CMS_add_smimecap(si, smcap);
 416                         sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 417                         if (!i)
 418                                 goto merr;
 419                         }
 420                 if (flags & CMS_REUSE_DIGEST)
 421                         {
 422                         if (!cms_copy_messageDigest(cms, si))
 423                                 goto err;
 424                         if (!(flags & CMS_PARTIAL) &&
 425                                         !CMS_SignerInfo_sign(si))
 426                                 goto err;
 427                         }
 428                 }
 429
 430         if (!(flags & CMS_NOCERTS))
 431                 {
 432                 /* NB ignore -1 return for duplicate cert */
 433                 if (!CMS_add1_cert(cms, signer))
 434                         goto merr;
 435                 }
 436
 437         if (!sd->signerInfos)
 438                 sd->signerInfos = sk_CMS_SignerInfo_new_null();
 439         if (!sd->signerInfos ||
 440                 !sk_CMS_SignerInfo_push(sd->signerInfos, si))
 441                 goto merr;
 442
 443         return si;
 444
 445         merr:
 446         CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
 447         err:
 448         if (si)
 449                 M_ASN1_free_of(si, CMS_SignerInfo);
 450         return NULL;
 451
 452         }
 453
 454 static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
 455         {
 456         ASN1_TIME *tt;
 457         int r = 0;
 458         if (t)
 459                 tt = t;
 460         else
 461                 tt = X509_gmtime_adj(NULL, 0);
 462
 463         if (!tt)
 464                 goto merr;
 465
 466         if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
 467                                                 tt->type, tt, -1) <= 0)
 468                 goto merr;
 469
 470         r = 1;
 471
 472         merr:
 473
 474         if (!t)
 475                 ASN1_TIME_free(tt);
 476
 477         if (!r)
 478                 CMSerr(CMS_F_CMS_ADD1_SIGNINGTIME, ERR_R_MALLOC_FAILURE);
 479
 480         return r;
 481
 482         }
 483
 484 STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
 485         {
 486         CMS_SignedData *sd;
 487         sd = cms_get0_signed(cms);
 488         if (!sd)
 489                 return NULL;
 490         return sd->signerInfos;
 491         }
 492
 493 STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms)
 494         {
 495         STACK_OF(X509) *signers = NULL;
 496         STACK_OF(CMS_SignerInfo) *sinfos;
 497         CMS_SignerInfo *si;
 498         int i;
 499         sinfos = CMS_get0_SignerInfos(cms);
 500         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 501                 {
 502                 si = sk_CMS_SignerInfo_value(sinfos, i);
 503                 if (si->signer)
 504                         {
 505                         if (!signers)
 506                                 {
 507                                 signers = sk_X509_new_null();
 508                                 if (!signers)
 509                                         return NULL;
 510                                 }
 511                         if (!sk_X509_push(signers, si->signer))
 512                                 {
 513                                 sk_X509_free(signers);
 514                                 return NULL;
 515                                 }
 516                         }
 517                 }
 518         return signers;
 519         }
 520
 521 void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
 522         {
 523         if (signer)
 524                 {
 525                 CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509);
 526                 if (si->pkey)
 527                         EVP_PKEY_free(si->pkey);
 528                 si->pkey = X509_get_pubkey(signer);
 529                 }
 530         if (si->signer)
 531                 X509_free(si->signer);
 532         si->signer = signer;
 533         }
 534
 535 int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si,
 536                                         ASN1_OCTET_STRING **keyid,
 537                                         X509_NAME **issuer, ASN1_INTEGER **sno)
 538         {
 539         return cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
 540         }
 541
 542 int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
 543         {
 544         return cms_SignerIdentifier_cert_cmp(si->sid, cert);
 545         }
 546
 547 int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
 548                                 unsigned int flags)
 549         {
 550         CMS_SignedData *sd;
 551         CMS_SignerInfo *si;
 552         CMS_CertificateChoices *cch;
 553         STACK_OF(CMS_CertificateChoices) *certs;
 554         X509 *x;
 555         int i, j;
 556         int ret = 0;
 557         sd = cms_get0_signed(cms);
 558         if (!sd)
 559                 return -1;
 560         certs = sd->certificates;
 561         for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++)
 562                 {
 563                 si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
 564                 if (si->signer)
 565                         continue;
 566
 567                 for (j = 0; j < sk_X509_num(scerts); j++)
 568                         {
 569                         x = sk_X509_value(scerts, j);
 570                         if (CMS_SignerInfo_cert_cmp(si, x) == 0)
 571                                 {
 572                                 CMS_SignerInfo_set1_signer_cert(si, x);
 573                                 ret++;
 574                                 break;
 575                                 }
 576                         }
 577
 578                 if (si->signer || (flags & CMS_NOINTERN))
 579                         continue;
 580
 581                 for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++)
 582                         {
 583                         cch = sk_CMS_CertificateChoices_value(certs, j);
 584                         if (cch->type != 0)
 585                                 continue;
 586                         x = cch->d.certificate;
 587                         if (CMS_SignerInfo_cert_cmp(si, x) == 0)
 588                                 {
 589                                 CMS_SignerInfo_set1_signer_cert(si, x);
 590                                 ret++;
 591                                 break;
 592                                 }
 593                         }
 594                 }
 595         return ret;
 596         }
 597
 598 void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk, X509 **signer,
 599                                         X509_ALGOR **pdig, X509_ALGOR **psig)
 600         {
 601         if (pk)
 602                 *pk = si->pkey;
 603         if (signer)
 604                 *signer = si->signer;
 605         if (pdig)
 606                 *pdig = si->digestAlgorithm;
 607         if (psig)
 608                 *psig = si->signatureAlgorithm;
 609         }
 610
 611 static int cms_SignerInfo_content_sign(CMS_SignerInfo *si, BIO *chain)
 612         {
 613         EVP_MD_CTX mctx;
 614         int r = 0;
 615         EVP_MD_CTX_init(&mctx);
 616
 617
 618         if (!si->pkey)
 619                 {
 620                 CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_NO_PRIVATE_KEY);
 621                 return 0;
 622                 }
 623
 624         if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
 625                 goto err;
 626
 627         /* If any signed attributes calculate and add messageDigest attribute */
 628
 629         if (CMS_signed_get_attr_count(si) >= 0)
 630                 {
 631                 unsigned char md[EVP_MAX_MD_SIZE];
 632                 unsigned int mdlen;
 633                 EVP_DigestFinal_ex(&mctx, md, &mdlen);
 634                 if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 635                                                 V_ASN1_OCTET_STRING,
 636                                                 md, mdlen))
 637                         goto err;
 638                 if (!CMS_SignerInfo_sign(si))
 639                         goto err;
 640                 }
 641         else
 642                 {
 643                 unsigned char *sig;
 644                 unsigned int siglen;
 645                 sig = OPENSSL_malloc(EVP_PKEY_size(si->pkey));
 646                 if (!sig)
 647                         {
 648                         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
 649                                         ERR_R_MALLOC_FAILURE);
 650                         goto err;
 651                         }
 652                 if (!EVP_SignFinal(&mctx, sig, &siglen, si->pkey))
 653                         {
 654                         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN,
 655                                         CMS_R_SIGNFINAL_ERROR);
 656                         OPENSSL_free(sig);
 657                         goto err;
 658                         }
 659                 ASN1_STRING_set0(si->signature, sig, siglen);
 660                 }
 661
 662         r = 1;
 663
 664         err:
 665         EVP_MD_CTX_cleanup(&mctx);
 666         return r;
 667
 668         }
 669
 670 int cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
 671         {
 672         STACK_OF(CMS_SignerInfo) *sinfos;
 673         CMS_SignerInfo *si;
 674         int i;
 675         sinfos = CMS_get0_SignerInfos(cms);
 676         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 677                 {
 678                 si = sk_CMS_SignerInfo_value(sinfos, i);
 679                 if (!cms_SignerInfo_content_sign(si, chain))
 680                         return 0;
 681                 }
 682         return 1;
 683         }
 684
 685 int CMS_SignerInfo_sign(CMS_SignerInfo *si)
 686         {
 687         EVP_MD_CTX mctx;
 688         EVP_PKEY_CTX *pctx;
 689         unsigned char *abuf = NULL;
 690         int alen;
 691         size_t siglen;
 692         const EVP_MD *md = NULL;
 693
 694         md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 695         if (md == NULL)
 696                 return 0;
 697
 698         EVP_MD_CTX_init(&mctx);
 699
 700         if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0)
 701                 {
 702                 if (!cms_add1_signingTime(si, NULL))
 703                         goto err;
 704                 }
 705
 706         if (EVP_DigestSignInit(&mctx, &pctx, md, NULL, si->pkey) <= 0)
 707                 goto err;
 708
 709         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 710                                 EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0)
 711                 {
 712                 CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 713                 goto err;
 714                 }
 715
 716         alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs,&abuf,
 717                                 ASN1_ITEM_rptr(CMS_Attributes_Sign));
 718         if(!abuf)
 719                 goto err;
 720         if (EVP_DigestSignUpdate(&mctx, abuf, alen) <= 0)
 721                 goto err;
 722         if (EVP_DigestSignFinal(&mctx, NULL, &siglen) <= 0)
 723                 goto err;
 724         OPENSSL_free(abuf);
 725         abuf = OPENSSL_malloc(siglen);
 726         if(!abuf)
 727                 goto err;
 728         if (EVP_DigestSignFinal(&mctx, abuf, &siglen) <= 0)
 729                 goto err;
 730
 731         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 732                                 EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0)
 733                 {
 734                 CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 735                 goto err;
 736                 }
 737
 738         EVP_MD_CTX_cleanup(&mctx);
 739
 740         ASN1_STRING_set0(si->signature, abuf, siglen);
 741
 742         return 1;
 743
 744         err:
 745         if (abuf)
 746                 OPENSSL_free(abuf);
 747         EVP_MD_CTX_cleanup(&mctx);
 748         return 0;
 749
 750         }
 751
 752 int CMS_SignerInfo_verify(CMS_SignerInfo *si)
 753         {
 754         EVP_MD_CTX mctx;
 755         EVP_PKEY_CTX *pctx;
 756         unsigned char *abuf = NULL;
 757         int alen, r = -1;
 758         const EVP_MD *md = NULL;
 759
 760         if (!si->pkey)
 761                 {
 762                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_NO_PUBLIC_KEY);
 763                 return -1;
 764                 }
 765
 766         md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 767         if (md == NULL)
 768                 return -1;
 769         EVP_MD_CTX_init(&mctx);
 770         if (EVP_DigestVerifyInit(&mctx, &pctx, md, NULL, si->pkey) <= 0)
 771                 goto err;
 772
 773         alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs,&abuf,
 774                                 ASN1_ITEM_rptr(CMS_Attributes_Verify));
 775         if(!abuf)
 776                 goto err;
 777         r = EVP_DigestVerifyUpdate(&mctx, abuf, alen);
 778         OPENSSL_free(abuf);
 779         if (r <= 0)
 780                 {
 781                 r = -1;
 782                 goto err;
 783                 }
 784         r = EVP_DigestVerifyFinal(&mctx,
 785                         si->signature->data, si->signature->length);
 786         if (!r)
 787                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_VERIFICATION_FAILURE);
 788         err:
 789         EVP_MD_CTX_cleanup(&mctx);
 790         return r;
 791         }
 792
 793 /* Create a chain of digest BIOs from a CMS ContentInfo */
 794
 795 BIO *cms_SignedData_init_bio(CMS_ContentInfo *cms)
 796         {
 797         int i;
 798         CMS_SignedData *sd;
 799         BIO *chain = NULL;
 800         sd = cms_get0_signed(cms);
 801         if (!sd)
 802                 return NULL;
 803         cms_sd_set_version(sd);
 804         for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++)
 805                 {
 806                 X509_ALGOR *digestAlgorithm;
 807                 BIO *mdbio;
 808                 digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 809                 mdbio = cms_DigestAlgorithm_init_bio(digestAlgorithm);
 810                 if (!mdbio)
 811                         goto err;
 812                 if (chain)
 813                          BIO_push(chain, mdbio);
 814                 else
 815                         chain = mdbio;
 816                 }
 817         return chain;
 818         err:
 819         if (chain)
 820                 BIO_free_all(chain);
 821         return NULL;
 822         }
 823
 824 int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
 825         {
 826         ASN1_OCTET_STRING *os = NULL;
 827         EVP_MD_CTX mctx;
 828         int r = -1;
 829         EVP_MD_CTX_init(&mctx);
 830         /* If we have any signed attributes look for messageDigest value */
 831         if (CMS_signed_get_attr_count(si) >= 0)
 832                 {
 833                 os = CMS_signed_get0_data_by_OBJ(si,
 834                                         OBJ_nid2obj(NID_pkcs9_messageDigest),
 835                                         -3, V_ASN1_OCTET_STRING);
 836                 if (!os)
 837                         {
 838                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 839                                 CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 840                         goto err;
 841                         }
 842                 }
 843
 844         if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
 845                 goto err;
 846
 847         /* If messageDigest found compare it */
 848
 849         if (os)
 850                 {
 851                 unsigned char mval[EVP_MAX_MD_SIZE];
 852                 unsigned int mlen;
 853                 if (EVP_DigestFinal_ex(&mctx, mval, &mlen) <= 0)
 854                         {
 855                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 856                                 CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
 857                         goto err;
 858                         }
 859                 if (mlen != (unsigned int)os->length)
 860                         {
 861                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 862                                 CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
 863                         goto err;
 864                         }
 865
 866                 if (memcmp(mval, os->data, mlen))
 867                         {
 868                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 869                                 CMS_R_VERIFICATION_FAILURE);
 870                         r = 0;
 871                         }
 872                 else
 873                         r = 1;
 874                 }
 875         else
 876                 {
 877                 r = EVP_VerifyFinal(&mctx, si->signature->data,
 878                                         si->signature->length, si->pkey);
 879                 if (r <= 0)
 880                         {
 881                         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 882                                 CMS_R_VERIFICATION_FAILURE);
 883                         r = 0;
 884                         }
 885                 }
 886
 887         err:
 888         EVP_MD_CTX_cleanup(&mctx);
 889         return r;
 890
 891         }
 892
 893 int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
 894         {
 895         unsigned char *smder = NULL;
 896         int smderlen, r;
 897         smderlen = i2d_X509_ALGORS(algs, &smder);
 898         if (smderlen <= 0)
 899                 return 0;
 900         r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
 901                                         V_ASN1_SEQUENCE, smder, smderlen);
 902         OPENSSL_free(smder);
 903         return r;
 904         }
 905
 906 int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
 907                                 int algnid, int keysize)
 908         {
 909         X509_ALGOR *alg;
 910         ASN1_INTEGER *key = NULL;
 911         if (keysize > 0)
 912                 {
 913                 key = ASN1_INTEGER_new();
 914                 if (!key || !ASN1_INTEGER_set(key, keysize))
 915                         return 0;
 916                 }
 917         alg = X509_ALGOR_new();
 918         if (!alg)
 919                 {
 920                 if (key)
 921                         ASN1_INTEGER_free(key);
 922                 return 0;
 923                 }
 924
 925         X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
 926                                 key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key);
 927         if (!*algs)
 928                 *algs = sk_X509_ALGOR_new_null();
 929         if (!*algs || !sk_X509_ALGOR_push(*algs, alg))
 930                 {
 931                 X509_ALGOR_free(alg);
 932                 return 0;
 933                 }
 934         return 1;
 935         }
 936
 937 /* Check to see if a cipher exists and if so add S/MIME capabilities */
 938
 939 static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
 940         {
 941         if (EVP_get_cipherbynid(nid))
 942                 return CMS_add_simple_smimecap(sk, nid, arg);
 943         return 1;
 944         }
 945
 946 static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
 947         {
 948         if (EVP_get_digestbynid(nid))
 949                 return CMS_add_simple_smimecap(sk, nid, arg);
 950         return 1;
 951         }
 952
 953 int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
 954         {
 955         if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
 956                 || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
 957                 || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
 958                 || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
 959                 || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
 960                 || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
 961                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
 962                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
 963                 || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
 964                 || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
 965                 return 0;
 966         return 1;
 967         }