crypto/openssl/crypto/cms/cms_sd.c

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