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 "internal/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 "internal/asn1_int.h"
  64
  65 /* CMS SignedData Utilities */
  66
  67 static CMS_SignedData *cms_get0_signed(CMS_ContentInfo *cms)
  68 {
  69     if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed) {
  70         CMSerr(CMS_F_CMS_GET0_SIGNED, CMS_R_CONTENT_TYPE_NOT_SIGNED_DATA);
  71         return NULL;
  72     }
  73     return cms->d.signedData;
  74 }
  75
  76 static CMS_SignedData *cms_signed_data_init(CMS_ContentInfo *cms)
  77 {
  78     if (cms->d.other == NULL) {
  79         cms->d.signedData = M_ASN1_new_of(CMS_SignedData);
  80         if (!cms->d.signedData) {
  81             CMSerr(CMS_F_CMS_SIGNED_DATA_INIT, ERR_R_MALLOC_FAILURE);
  82             return NULL;
  83         }
  84         cms->d.signedData->version = 1;
  85         cms->d.signedData->encapContentInfo->eContentType =
  86             OBJ_nid2obj(NID_pkcs7_data);
  87         cms->d.signedData->encapContentInfo->partial = 1;
  88         ASN1_OBJECT_free(cms->contentType);
  89         cms->contentType = OBJ_nid2obj(NID_pkcs7_signed);
  90         return cms->d.signedData;
  91     }
  92     return cms_get0_signed(cms);
  93 }
  94
  95 /* Just initialize SignedData e.g. for certs only structure */
  96
  97 int CMS_SignedData_init(CMS_ContentInfo *cms)
  98 {
  99     if (cms_signed_data_init(cms))
 100         return 1;
 101     else
 102         return 0;
 103 }
 104
 105 /* Check structures and fixup version numbers (if necessary) */
 106
 107 static void cms_sd_set_version(CMS_SignedData *sd)
 108 {
 109     int i;
 110     CMS_CertificateChoices *cch;
 111     CMS_RevocationInfoChoice *rch;
 112     CMS_SignerInfo *si;
 113
 114     for (i = 0; i < sk_CMS_CertificateChoices_num(sd->certificates); i++) {
 115         cch = sk_CMS_CertificateChoices_value(sd->certificates, i);
 116         if (cch->type == CMS_CERTCHOICE_OTHER) {
 117             if (sd->version < 5)
 118                 sd->version = 5;
 119         } else if (cch->type == CMS_CERTCHOICE_V2ACERT) {
 120             if (sd->version < 4)
 121                 sd->version = 4;
 122         } else if (cch->type == CMS_CERTCHOICE_V1ACERT) {
 123             if (sd->version < 3)
 124                 sd->version = 3;
 125         }
 126     }
 127
 128     for (i = 0; i < sk_CMS_RevocationInfoChoice_num(sd->crls); i++) {
 129         rch = sk_CMS_RevocationInfoChoice_value(sd->crls, i);
 130         if (rch->type == CMS_REVCHOICE_OTHER) {
 131             if (sd->version < 5)
 132                 sd->version = 5;
 133         }
 134     }
 135
 136     if ((OBJ_obj2nid(sd->encapContentInfo->eContentType) != NID_pkcs7_data)
 137         && (sd->version < 3))
 138         sd->version = 3;
 139
 140     for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
 141         si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
 142         if (si->sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
 143             if (si->version < 3)
 144                 si->version = 3;
 145             if (sd->version < 3)
 146                 sd->version = 3;
 147         } else if (si->version < 1)
 148             si->version = 1;
 149     }
 150
 151     if (sd->version < 1)
 152         sd->version = 1;
 153
 154 }
 155
 156 /* Copy an existing messageDigest value */
 157
 158 static int cms_copy_messageDigest(CMS_ContentInfo *cms, CMS_SignerInfo *si)
 159 {
 160     STACK_OF(CMS_SignerInfo) *sinfos;
 161     CMS_SignerInfo *sitmp;
 162     int i;
 163     sinfos = CMS_get0_SignerInfos(cms);
 164     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 165         ASN1_OCTET_STRING *messageDigest;
 166         sitmp = sk_CMS_SignerInfo_value(sinfos, i);
 167         if (sitmp == si)
 168             continue;
 169         if (CMS_signed_get_attr_count(sitmp) < 0)
 170             continue;
 171         if (OBJ_cmp(si->digestAlgorithm->algorithm,
 172                     sitmp->digestAlgorithm->algorithm))
 173             continue;
 174         messageDigest = CMS_signed_get0_data_by_OBJ(sitmp,
 175                                                     OBJ_nid2obj
 176                                                     (NID_pkcs9_messageDigest),
 177                                                     -3, V_ASN1_OCTET_STRING);
 178         if (!messageDigest) {
 179             CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST,
 180                    CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 181             return 0;
 182         }
 183
 184         if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 185                                         V_ASN1_OCTET_STRING,
 186                                         messageDigest, -1))
 187             return 1;
 188         else
 189             return 0;
 190     }
 191     CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST, CMS_R_NO_MATCHING_DIGEST);
 192     return 0;
 193 }
 194
 195 int cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert, int type)
 196 {
 197     switch (type) {
 198     case CMS_SIGNERINFO_ISSUER_SERIAL:
 199         if (!cms_set1_ias(&sid->d.issuerAndSerialNumber, cert))
 200             return 0;
 201         break;
 202
 203     case CMS_SIGNERINFO_KEYIDENTIFIER:
 204         if (!cms_set1_keyid(&sid->d.subjectKeyIdentifier, cert))
 205             return 0;
 206         break;
 207
 208     default:
 209         CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, CMS_R_UNKNOWN_ID);
 210         return 0;
 211     }
 212
 213     sid->type = type;
 214
 215     return 1;
 216 }
 217
 218 int cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier *sid,
 219                                         ASN1_OCTET_STRING **keyid,
 220                                         X509_NAME **issuer,
 221                                         ASN1_INTEGER **sno)
 222 {
 223     if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL) {
 224         if (issuer)
 225             *issuer = sid->d.issuerAndSerialNumber->issuer;
 226         if (sno)
 227             *sno = sid->d.issuerAndSerialNumber->serialNumber;
 228     } else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
 229         if (keyid)
 230             *keyid = sid->d.subjectKeyIdentifier;
 231     } else
 232         return 0;
 233     return 1;
 234 }
 235
 236 int cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert)
 237 {
 238     if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
 239         return cms_ias_cert_cmp(sid->d.issuerAndSerialNumber, cert);
 240     else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
 241         return cms_keyid_cert_cmp(sid->d.subjectKeyIdentifier, cert);
 242     else
 243         return -1;
 244 }
 245
 246 static int cms_sd_asn1_ctrl(CMS_SignerInfo *si, int cmd)
 247 {
 248     EVP_PKEY *pkey = si->pkey;
 249     int i;
 250     if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
 251         return 1;
 252     i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_SIGN, cmd, si);
 253     if (i == -2) {
 254         CMSerr(CMS_F_CMS_SD_ASN1_CTRL, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 255         return 0;
 256     }
 257     if (i <= 0) {
 258         CMSerr(CMS_F_CMS_SD_ASN1_CTRL, CMS_R_CTRL_FAILURE);
 259         return 0;
 260     }
 261     return 1;
 262 }
 263
 264 CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms,
 265                                 X509 *signer, EVP_PKEY *pk, const EVP_MD *md,
 266                                 unsigned int flags)
 267 {
 268     CMS_SignedData *sd;
 269     CMS_SignerInfo *si = NULL;
 270     X509_ALGOR *alg;
 271     int i, type;
 272     if (!X509_check_private_key(signer, pk)) {
 273         CMSerr(CMS_F_CMS_ADD1_SIGNER,
 274                CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 275         return NULL;
 276     }
 277     sd = cms_signed_data_init(cms);
 278     if (!sd)
 279         goto err;
 280     si = M_ASN1_new_of(CMS_SignerInfo);
 281     if (!si)
 282         goto merr;
 283     X509_check_purpose(signer, -1, -1);
 284
 285     CRYPTO_add(&pk->references, 1, CRYPTO_LOCK_EVP_PKEY);
 286     X509_up_ref(signer);
 287
 288     si->pkey = pk;
 289     si->signer = signer;
 290     EVP_MD_CTX_init(&si->mctx);
 291     si->pctx = NULL;
 292
 293     if (flags & CMS_USE_KEYID) {
 294         si->version = 3;
 295         if (sd->version < 3)
 296             sd->version = 3;
 297         type = CMS_SIGNERINFO_KEYIDENTIFIER;
 298     } else {
 299         type = CMS_SIGNERINFO_ISSUER_SERIAL;
 300         si->version = 1;
 301     }
 302
 303     if (!cms_set1_SignerIdentifier(si->sid, signer, type))
 304         goto err;
 305
 306     if (md == NULL) {
 307         int def_nid;
 308         if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0)
 309             goto err;
 310         md = EVP_get_digestbynid(def_nid);
 311         if (md == NULL) {
 312             CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DEFAULT_DIGEST);
 313             goto err;
 314         }
 315     }
 316
 317     if (!md) {
 318         CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DIGEST_SET);
 319         goto err;
 320     }
 321
 322     X509_ALGOR_set_md(si->digestAlgorithm, md);
 323
 324     /* See if digest is present in digestAlgorithms */
 325     for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
 326         ASN1_OBJECT *aoid;
 327         alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 328         X509_ALGOR_get0(&aoid, NULL, NULL, alg);
 329         if (OBJ_obj2nid(aoid) == EVP_MD_type(md))
 330             break;
 331     }
 332
 333     if (i == sk_X509_ALGOR_num(sd->digestAlgorithms)) {
 334         alg = X509_ALGOR_new();
 335         if (alg == NULL)
 336             goto merr;
 337         X509_ALGOR_set_md(alg, md);
 338         if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg)) {
 339             X509_ALGOR_free(alg);
 340             goto merr;
 341         }
 342     }
 343
 344     if (!(flags & CMS_KEY_PARAM) && !cms_sd_asn1_ctrl(si, 0))
 345         goto err;
 346     if (!(flags & CMS_NOATTR)) {
 347         /*
 348          * Initialialize signed attributes strutucture so other attributes
 349          * such as signing time etc are added later even if we add none here.
 350          */
 351         if (!si->signedAttrs) {
 352             si->signedAttrs = sk_X509_ATTRIBUTE_new_null();
 353             if (!si->signedAttrs)
 354                 goto merr;
 355         }
 356
 357         if (!(flags & CMS_NOSMIMECAP)) {
 358             STACK_OF(X509_ALGOR) *smcap = NULL;
 359             i = CMS_add_standard_smimecap(&smcap);
 360             if (i)
 361                 i = CMS_add_smimecap(si, smcap);
 362             sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 363             if (!i)
 364                 goto merr;
 365         }
 366         if (flags & CMS_REUSE_DIGEST) {
 367             if (!cms_copy_messageDigest(cms, si))
 368                 goto err;
 369             if (!(flags & (CMS_PARTIAL | CMS_KEY_PARAM)) &&
 370                 !CMS_SignerInfo_sign(si))
 371                 goto err;
 372         }
 373     }
 374
 375     if (!(flags & CMS_NOCERTS)) {
 376         /* NB ignore -1 return for duplicate cert */
 377         if (!CMS_add1_cert(cms, signer))
 378             goto merr;
 379     }
 380
 381     if (flags & CMS_KEY_PARAM) {
 382         if (flags & CMS_NOATTR) {
 383             si->pctx = EVP_PKEY_CTX_new(si->pkey, NULL);
 384             if (si->pctx == NULL)
 385                 goto err;
 386             if (EVP_PKEY_sign_init(si->pctx) <= 0)
 387                 goto err;
 388             if (EVP_PKEY_CTX_set_signature_md(si->pctx, md) <= 0)
 389                 goto err;
 390         } else if (EVP_DigestSignInit(&si->mctx, &si->pctx, md, NULL, pk) <=
 391                    0)
 392             goto err;
 393     }
 394
 395     if (!sd->signerInfos)
 396         sd->signerInfos = sk_CMS_SignerInfo_new_null();
 397     if (!sd->signerInfos || !sk_CMS_SignerInfo_push(sd->signerInfos, si))
 398         goto merr;
 399
 400     return si;
 401
 402  merr:
 403     CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
 404  err:
 405     M_ASN1_free_of(si, CMS_SignerInfo);
 406     return NULL;
 407
 408 }
 409
 410 static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
 411 {
 412     ASN1_TIME *tt;
 413     int r = 0;
 414     if (t)
 415         tt = t;
 416     else
 417         tt = X509_gmtime_adj(NULL, 0);
 418
 419     if (!tt)
 420         goto merr;
 421
 422     if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
 423                                     tt->type, tt, -1) <= 0)
 424         goto merr;
 425
 426     r = 1;
 427
 428  merr:
 429
 430     if (!t)
 431         ASN1_TIME_free(tt);
 432
 433     if (!r)
 434         CMSerr(CMS_F_CMS_ADD1_SIGNINGTIME, ERR_R_MALLOC_FAILURE);
 435
 436     return r;
 437
 438 }
 439
 440 EVP_PKEY_CTX *CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo *si)
 441 {
 442     return si->pctx;
 443 }
 444
 445 EVP_MD_CTX *CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo *si)
 446 {
 447     return &si->mctx;
 448 }
 449
 450 STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
 451 {
 452     CMS_SignedData *sd;
 453     sd = cms_get0_signed(cms);
 454     if (!sd)
 455         return NULL;
 456     return sd->signerInfos;
 457 }
 458
 459 STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms)
 460 {
 461     STACK_OF(X509) *signers = NULL;
 462     STACK_OF(CMS_SignerInfo) *sinfos;
 463     CMS_SignerInfo *si;
 464     int i;
 465     sinfos = CMS_get0_SignerInfos(cms);
 466     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 467         si = sk_CMS_SignerInfo_value(sinfos, i);
 468         if (si->signer) {
 469             if (!signers) {
 470                 signers = sk_X509_new_null();
 471                 if (!signers)
 472                     return NULL;
 473             }
 474             if (!sk_X509_push(signers, si->signer)) {
 475                 sk_X509_free(signers);
 476                 return NULL;
 477             }
 478         }
 479     }
 480     return signers;
 481 }
 482
 483 void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
 484 {
 485     if (signer) {
 486         X509_up_ref(signer);
 487         EVP_PKEY_free(si->pkey);
 488         si->pkey = X509_get_pubkey(signer);
 489     }
 490     X509_free(si->signer);
 491     si->signer = signer;
 492 }
 493
 494 int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si,
 495                                   ASN1_OCTET_STRING **keyid,
 496                                   X509_NAME **issuer, ASN1_INTEGER **sno)
 497 {
 498     return cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
 499 }
 500
 501 int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
 502 {
 503     return cms_SignerIdentifier_cert_cmp(si->sid, cert);
 504 }
 505
 506 int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
 507                            unsigned int flags)
 508 {
 509     CMS_SignedData *sd;
 510     CMS_SignerInfo *si;
 511     CMS_CertificateChoices *cch;
 512     STACK_OF(CMS_CertificateChoices) *certs;
 513     X509 *x;
 514     int i, j;
 515     int ret = 0;
 516     sd = cms_get0_signed(cms);
 517     if (!sd)
 518         return -1;
 519     certs = sd->certificates;
 520     for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
 521         si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
 522         if (si->signer)
 523             continue;
 524
 525         for (j = 0; j < sk_X509_num(scerts); j++) {
 526             x = sk_X509_value(scerts, j);
 527             if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
 528                 CMS_SignerInfo_set1_signer_cert(si, x);
 529                 ret++;
 530                 break;
 531             }
 532         }
 533
 534         if (si->signer || (flags & CMS_NOINTERN))
 535             continue;
 536
 537         for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++) {
 538             cch = sk_CMS_CertificateChoices_value(certs, j);
 539             if (cch->type != 0)
 540                 continue;
 541             x = cch->d.certificate;
 542             if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
 543                 CMS_SignerInfo_set1_signer_cert(si, x);
 544                 ret++;
 545                 break;
 546             }
 547         }
 548     }
 549     return ret;
 550 }
 551
 552 void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk,
 553                               X509 **signer, X509_ALGOR **pdig,
 554                               X509_ALGOR **psig)
 555 {
 556     if (pk)
 557         *pk = si->pkey;
 558     if (signer)
 559         *signer = si->signer;
 560     if (pdig)
 561         *pdig = si->digestAlgorithm;
 562     if (psig)
 563         *psig = si->signatureAlgorithm;
 564 }
 565
 566 ASN1_OCTET_STRING *CMS_SignerInfo_get0_signature(CMS_SignerInfo *si)
 567 {
 568     return si->signature;
 569 }
 570
 571 static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
 572                                        CMS_SignerInfo *si, BIO *chain)
 573 {
 574     EVP_MD_CTX mctx;
 575     int r = 0;
 576     EVP_PKEY_CTX *pctx = NULL;
 577     EVP_MD_CTX_init(&mctx);
 578
 579     if (!si->pkey) {
 580         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_NO_PRIVATE_KEY);
 581         return 0;
 582     }
 583
 584     if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
 585         goto err;
 586     /* Set SignerInfo algortihm details if we used custom parametsr */
 587     if (si->pctx && !cms_sd_asn1_ctrl(si, 0))
 588         goto err;
 589
 590     /*
 591      * If any signed attributes calculate and add messageDigest attribute
 592      */
 593
 594     if (CMS_signed_get_attr_count(si) >= 0) {
 595         ASN1_OBJECT *ctype =
 596             cms->d.signedData->encapContentInfo->eContentType;
 597         unsigned char md[EVP_MAX_MD_SIZE];
 598         unsigned int mdlen;
 599         if (!EVP_DigestFinal_ex(&mctx, md, &mdlen))
 600             goto err;
 601         if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 602                                          V_ASN1_OCTET_STRING, md, mdlen))
 603             goto err;
 604         /* Copy content type across */
 605         if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
 606                                         V_ASN1_OBJECT, ctype, -1) <= 0)
 607             goto err;
 608         if (!CMS_SignerInfo_sign(si))
 609             goto err;
 610     } else if (si->pctx) {
 611         unsigned char *sig;
 612         size_t siglen;
 613         unsigned char md[EVP_MAX_MD_SIZE];
 614         unsigned int mdlen;
 615         pctx = si->pctx;
 616         if (!EVP_DigestFinal_ex(&mctx, md, &mdlen))
 617             goto err;
 618         siglen = EVP_PKEY_size(si->pkey);
 619         sig = OPENSSL_malloc(siglen);
 620         if (sig == NULL) {
 621             CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE);
 622             goto err;
 623         }
 624         if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0) {
 625             OPENSSL_free(sig);
 626             goto err;
 627         }
 628         ASN1_STRING_set0(si->signature, sig, siglen);
 629     } else {
 630         unsigned char *sig;
 631         unsigned int siglen;
 632         sig = OPENSSL_malloc(EVP_PKEY_size(si->pkey));
 633         if (sig == NULL) {
 634             CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE);
 635             goto err;
 636         }
 637         if (!EVP_SignFinal(&mctx, sig, &siglen, si->pkey)) {
 638             CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_SIGNFINAL_ERROR);
 639             OPENSSL_free(sig);
 640             goto err;
 641         }
 642         ASN1_STRING_set0(si->signature, sig, siglen);
 643     }
 644
 645     r = 1;
 646
 647  err:
 648     EVP_MD_CTX_cleanup(&mctx);
 649     EVP_PKEY_CTX_free(pctx);
 650     return r;
 651
 652 }
 653
 654 int cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
 655 {
 656     STACK_OF(CMS_SignerInfo) *sinfos;
 657     CMS_SignerInfo *si;
 658     int i;
 659     sinfos = CMS_get0_SignerInfos(cms);
 660     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 661         si = sk_CMS_SignerInfo_value(sinfos, i);
 662         if (!cms_SignerInfo_content_sign(cms, si, chain))
 663             return 0;
 664     }
 665     cms->d.signedData->encapContentInfo->partial = 0;
 666     return 1;
 667 }
 668
 669 int CMS_SignerInfo_sign(CMS_SignerInfo *si)
 670 {
 671     EVP_MD_CTX *mctx = &si->mctx;
 672     EVP_PKEY_CTX *pctx;
 673     unsigned char *abuf = NULL;
 674     int alen;
 675     size_t siglen;
 676     const EVP_MD *md = NULL;
 677
 678     md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 679     if (md == NULL)
 680         return 0;
 681
 682     if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0) {
 683         if (!cms_add1_signingTime(si, NULL))
 684             goto err;
 685     }
 686
 687     if (si->pctx)
 688         pctx = si->pctx;
 689     else {
 690         EVP_MD_CTX_init(mctx);
 691         if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0)
 692             goto err;
 693     }
 694
 695     if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 696                           EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0) {
 697         CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 698         goto err;
 699     }
 700
 701     alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
 702                          ASN1_ITEM_rptr(CMS_Attributes_Sign));
 703     if (!abuf)
 704         goto err;
 705     if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
 706         goto err;
 707     if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
 708         goto err;
 709     OPENSSL_free(abuf);
 710     abuf = OPENSSL_malloc(siglen);
 711     if (abuf == NULL)
 712         goto err;
 713     if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
 714         goto err;
 715
 716     if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 717                           EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0) {
 718         CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 719         goto err;
 720     }
 721
 722     EVP_MD_CTX_cleanup(mctx);
 723
 724     ASN1_STRING_set0(si->signature, abuf, siglen);
 725
 726     return 1;
 727
 728  err:
 729     OPENSSL_free(abuf);
 730     EVP_MD_CTX_cleanup(mctx);
 731     return 0;
 732
 733 }
 734
 735 int CMS_SignerInfo_verify(CMS_SignerInfo *si)
 736 {
 737     EVP_MD_CTX *mctx = &si->mctx;
 738     unsigned char *abuf = NULL;
 739     int alen, r = -1;
 740     const EVP_MD *md = NULL;
 741
 742     if (!si->pkey) {
 743         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_NO_PUBLIC_KEY);
 744         return -1;
 745     }
 746
 747     md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 748     if (md == NULL)
 749         return -1;
 750     EVP_MD_CTX_init(mctx);
 751     if (EVP_DigestVerifyInit(mctx, &si->pctx, md, NULL, si->pkey) <= 0)
 752         goto err;
 753
 754     if (!cms_sd_asn1_ctrl(si, 1))
 755         goto err;
 756
 757     alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
 758                          ASN1_ITEM_rptr(CMS_Attributes_Verify));
 759     if (!abuf)
 760         goto err;
 761     r = EVP_DigestVerifyUpdate(mctx, abuf, alen);
 762     OPENSSL_free(abuf);
 763     if (r <= 0) {
 764         r = -1;
 765         goto err;
 766     }
 767     r = EVP_DigestVerifyFinal(mctx,
 768                               si->signature->data, si->signature->length);
 769     if (r <= 0)
 770         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_VERIFICATION_FAILURE);
 771  err:
 772     EVP_MD_CTX_cleanup(mctx);
 773     return r;
 774 }
 775
 776 /* Create a chain of digest BIOs from a CMS ContentInfo */
 777
 778 BIO *cms_SignedData_init_bio(CMS_ContentInfo *cms)
 779 {
 780     int i;
 781     CMS_SignedData *sd;
 782     BIO *chain = NULL;
 783     sd = cms_get0_signed(cms);
 784     if (!sd)
 785         return NULL;
 786     if (cms->d.signedData->encapContentInfo->partial)
 787         cms_sd_set_version(sd);
 788     for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
 789         X509_ALGOR *digestAlgorithm;
 790         BIO *mdbio;
 791         digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 792         mdbio = cms_DigestAlgorithm_init_bio(digestAlgorithm);
 793         if (!mdbio)
 794             goto err;
 795         if (chain)
 796             BIO_push(chain, mdbio);
 797         else
 798             chain = mdbio;
 799     }
 800     return chain;
 801  err:
 802     BIO_free_all(chain);
 803     return NULL;
 804 }
 805
 806 int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
 807 {
 808     ASN1_OCTET_STRING *os = NULL;
 809     EVP_MD_CTX mctx;
 810     EVP_PKEY_CTX *pkctx = NULL;
 811     int r = -1;
 812     unsigned char mval[EVP_MAX_MD_SIZE];
 813     unsigned int mlen;
 814     EVP_MD_CTX_init(&mctx);
 815     /* If we have any signed attributes look for messageDigest value */
 816     if (CMS_signed_get_attr_count(si) >= 0) {
 817         os = CMS_signed_get0_data_by_OBJ(si,
 818                                          OBJ_nid2obj(NID_pkcs9_messageDigest),
 819                                          -3, V_ASN1_OCTET_STRING);
 820         if (!os) {
 821             CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 822                    CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 823             goto err;
 824         }
 825     }
 826
 827     if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, si->digestAlgorithm))
 828         goto err;
 829
 830     if (EVP_DigestFinal_ex(&mctx, mval, &mlen) <= 0) {
 831         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 832                CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
 833         goto err;
 834     }
 835
 836     /* If messageDigest found compare it */
 837
 838     if (os) {
 839         if (mlen != (unsigned int)os->length) {
 840             CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 841                    CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
 842             goto err;
 843         }
 844
 845         if (memcmp(mval, os->data, mlen)) {
 846             CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 847                    CMS_R_VERIFICATION_FAILURE);
 848             r = 0;
 849         } else
 850             r = 1;
 851     } else {
 852         const EVP_MD *md = EVP_MD_CTX_md(&mctx);
 853         pkctx = EVP_PKEY_CTX_new(si->pkey, NULL);
 854         if (pkctx == NULL)
 855             goto err;
 856         if (EVP_PKEY_verify_init(pkctx) <= 0)
 857             goto err;
 858         if (EVP_PKEY_CTX_set_signature_md(pkctx, md) <= 0)
 859             goto err;
 860         si->pctx = pkctx;
 861         if (!cms_sd_asn1_ctrl(si, 1))
 862             goto err;
 863         r = EVP_PKEY_verify(pkctx, si->signature->data,
 864                             si->signature->length, mval, mlen);
 865         if (r <= 0) {
 866             CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 867                    CMS_R_VERIFICATION_FAILURE);
 868             r = 0;
 869         }
 870     }
 871
 872  err:
 873     EVP_PKEY_CTX_free(pkctx);
 874     EVP_MD_CTX_cleanup(&mctx);
 875     return r;
 876
 877 }
 878
 879 int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
 880 {
 881     unsigned char *smder = NULL;
 882     int smderlen, r;
 883     smderlen = i2d_X509_ALGORS(algs, &smder);
 884     if (smderlen <= 0)
 885         return 0;
 886     r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
 887                                     V_ASN1_SEQUENCE, smder, smderlen);
 888     OPENSSL_free(smder);
 889     return r;
 890 }
 891
 892 int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
 893                             int algnid, int keysize)
 894 {
 895     X509_ALGOR *alg;
 896     ASN1_INTEGER *key = NULL;
 897     if (keysize > 0) {
 898         key = ASN1_INTEGER_new();
 899         if (key == NULL || !ASN1_INTEGER_set(key, keysize))
 900             return 0;
 901     }
 902     alg = X509_ALGOR_new();
 903     if (alg == NULL) {
 904         ASN1_INTEGER_free(key);
 905         return 0;
 906     }
 907
 908     X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
 909                     key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key);
 910     if (*algs == NULL)
 911         *algs = sk_X509_ALGOR_new_null();
 912     if (*algs == NULL || !sk_X509_ALGOR_push(*algs, alg)) {
 913         X509_ALGOR_free(alg);
 914         return 0;
 915     }
 916     return 1;
 917 }
 918
 919 /* Check to see if a cipher exists and if so add S/MIME capabilities */
 920
 921 static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
 922 {
 923     if (EVP_get_cipherbynid(nid))
 924         return CMS_add_simple_smimecap(sk, nid, arg);
 925     return 1;
 926 }
 927
 928 static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
 929 {
 930     if (EVP_get_digestbynid(nid))
 931         return CMS_add_simple_smimecap(sk, nid, arg);
 932     return 1;
 933 }
 934
 935 int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
 936 {
 937     if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
 938         || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
 939         || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
 940         || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
 941         || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
 942         || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
 943         || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
 944         || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
 945         || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
 946         || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
 947         || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
 948         || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
 949         return 0;
 950     return 1;
 951 }