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 #include "internal/evp_int.h"
  65
  66 /* CMS SignedData Utilities */
  67
  68 static CMS_SignedData *cms_get0_signed(CMS_ContentInfo *cms)
  69 {
  70     if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed) {
  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         cms->d.signedData = M_ASN1_new_of(CMS_SignedData);
  81         if (!cms->d.signedData) {
  82             CMSerr(CMS_F_CMS_SIGNED_DATA_INIT, ERR_R_MALLOC_FAILURE);
  83             return NULL;
  84         }
  85         cms->d.signedData->version = 1;
  86         cms->d.signedData->encapContentInfo->eContentType =
  87             OBJ_nid2obj(NID_pkcs7_data);
  88         cms->d.signedData->encapContentInfo->partial = 1;
  89         ASN1_OBJECT_free(cms->contentType);
  90         cms->contentType = OBJ_nid2obj(NID_pkcs7_signed);
  91         return cms->d.signedData;
  92     }
  93     return cms_get0_signed(cms);
  94 }
  95
  96 /* Just initialize SignedData e.g. for certs only structure */
  97
  98 int CMS_SignedData_init(CMS_ContentInfo *cms)
  99 {
 100     if (cms_signed_data_init(cms))
 101         return 1;
 102     else
 103         return 0;
 104 }
 105
 106 /* Check structures and fixup version numbers (if necessary) */
 107
 108 static void cms_sd_set_version(CMS_SignedData *sd)
 109 {
 110     int i;
 111     CMS_CertificateChoices *cch;
 112     CMS_RevocationInfoChoice *rch;
 113     CMS_SignerInfo *si;
 114
 115     for (i = 0; i < sk_CMS_CertificateChoices_num(sd->certificates); i++) {
 116         cch = sk_CMS_CertificateChoices_value(sd->certificates, i);
 117         if (cch->type == CMS_CERTCHOICE_OTHER) {
 118             if (sd->version < 5)
 119                 sd->version = 5;
 120         } else if (cch->type == CMS_CERTCHOICE_V2ACERT) {
 121             if (sd->version < 4)
 122                 sd->version = 4;
 123         } else if (cch->type == CMS_CERTCHOICE_V1ACERT) {
 124             if (sd->version < 3)
 125                 sd->version = 3;
 126         }
 127     }
 128
 129     for (i = 0; i < sk_CMS_RevocationInfoChoice_num(sd->crls); i++) {
 130         rch = sk_CMS_RevocationInfoChoice_value(sd->crls, i);
 131         if (rch->type == CMS_REVCHOICE_OTHER) {
 132             if (sd->version < 5)
 133                 sd->version = 5;
 134         }
 135     }
 136
 137     if ((OBJ_obj2nid(sd->encapContentInfo->eContentType) != NID_pkcs7_data)
 138         && (sd->version < 3))
 139         sd->version = 3;
 140
 141     for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
 142         si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
 143         if (si->sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
 144             if (si->version < 3)
 145                 si->version = 3;
 146             if (sd->version < 3)
 147                 sd->version = 3;
 148         } else if (si->version < 1)
 149             si->version = 1;
 150     }
 151
 152     if (sd->version < 1)
 153         sd->version = 1;
 154
 155 }
 156
 157 /* Copy an existing messageDigest value */
 158
 159 static int cms_copy_messageDigest(CMS_ContentInfo *cms, CMS_SignerInfo *si)
 160 {
 161     STACK_OF(CMS_SignerInfo) *sinfos;
 162     CMS_SignerInfo *sitmp;
 163     int i;
 164     sinfos = CMS_get0_SignerInfos(cms);
 165     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 166         ASN1_OCTET_STRING *messageDigest;
 167         sitmp = sk_CMS_SignerInfo_value(sinfos, i);
 168         if (sitmp == si)
 169             continue;
 170         if (CMS_signed_get_attr_count(sitmp) < 0)
 171             continue;
 172         if (OBJ_cmp(si->digestAlgorithm->algorithm,
 173                     sitmp->digestAlgorithm->algorithm))
 174             continue;
 175         messageDigest = CMS_signed_get0_data_by_OBJ(sitmp,
 176                                                     OBJ_nid2obj
 177                                                     (NID_pkcs9_messageDigest),
 178                                                     -3, V_ASN1_OCTET_STRING);
 179         if (!messageDigest) {
 180             CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST,
 181                    CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 182             return 0;
 183         }
 184
 185         if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 186                                         V_ASN1_OCTET_STRING,
 187                                         messageDigest, -1))
 188             return 1;
 189         else
 190             return 0;
 191     }
 192     CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST, CMS_R_NO_MATCHING_DIGEST);
 193     return 0;
 194 }
 195
 196 int cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert, int type)
 197 {
 198     switch (type) {
 199     case CMS_SIGNERINFO_ISSUER_SERIAL:
 200         if (!cms_set1_ias(&sid->d.issuerAndSerialNumber, cert))
 201             return 0;
 202         break;
 203
 204     case CMS_SIGNERINFO_KEYIDENTIFIER:
 205         if (!cms_set1_keyid(&sid->d.subjectKeyIdentifier, cert))
 206             return 0;
 207         break;
 208
 209     default:
 210         CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, CMS_R_UNKNOWN_ID);
 211         return 0;
 212     }
 213
 214     sid->type = type;
 215
 216     return 1;
 217 }
 218
 219 int cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier *sid,
 220                                         ASN1_OCTET_STRING **keyid,
 221                                         X509_NAME **issuer,
 222                                         ASN1_INTEGER **sno)
 223 {
 224     if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL) {
 225         if (issuer)
 226             *issuer = sid->d.issuerAndSerialNumber->issuer;
 227         if (sno)
 228             *sno = sid->d.issuerAndSerialNumber->serialNumber;
 229     } else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
 230         if (keyid)
 231             *keyid = sid->d.subjectKeyIdentifier;
 232     } else
 233         return 0;
 234     return 1;
 235 }
 236
 237 int cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert)
 238 {
 239     if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
 240         return cms_ias_cert_cmp(sid->d.issuerAndSerialNumber, cert);
 241     else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
 242         return cms_keyid_cert_cmp(sid->d.subjectKeyIdentifier, cert);
 243     else
 244         return -1;
 245 }
 246
 247 static int cms_sd_asn1_ctrl(CMS_SignerInfo *si, int cmd)
 248 {
 249     EVP_PKEY *pkey = si->pkey;
 250     int i;
 251     if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
 252         return 1;
 253     i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_SIGN, cmd, si);
 254     if (i == -2) {
 255         CMSerr(CMS_F_CMS_SD_ASN1_CTRL, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 256         return 0;
 257     }
 258     if (i <= 0) {
 259         CMSerr(CMS_F_CMS_SD_ASN1_CTRL, CMS_R_CTRL_FAILURE);
 260         return 0;
 261     }
 262     return 1;
 263 }
 264
 265 CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms,
 266                                 X509 *signer, EVP_PKEY *pk, const EVP_MD *md,
 267                                 unsigned int flags)
 268 {
 269     CMS_SignedData *sd;
 270     CMS_SignerInfo *si = NULL;
 271     X509_ALGOR *alg;
 272     int i, type;
 273     if (!X509_check_private_key(signer, pk)) {
 274         CMSerr(CMS_F_CMS_ADD1_SIGNER,
 275                CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 276         return NULL;
 277     }
 278     sd = cms_signed_data_init(cms);
 279     if (!sd)
 280         goto err;
 281     si = M_ASN1_new_of(CMS_SignerInfo);
 282     if (!si)
 283         goto merr;
 284     X509_check_purpose(signer, -1, -1);
 285
 286     CRYPTO_add(&pk->references, 1, CRYPTO_LOCK_EVP_PKEY);
 287     X509_up_ref(signer);
 288
 289     si->pkey = pk;
 290     si->signer = signer;
 291     si->mctx = EVP_MD_CTX_new();
 292     si->pctx = NULL;
 293
 294     if (si->mctx == NULL) {
 295         CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
 296         goto err;
 297     }
 298
 299     if (flags & CMS_USE_KEYID) {
 300         si->version = 3;
 301         if (sd->version < 3)
 302             sd->version = 3;
 303         type = CMS_SIGNERINFO_KEYIDENTIFIER;
 304     } else {
 305         type = CMS_SIGNERINFO_ISSUER_SERIAL;
 306         si->version = 1;
 307     }
 308
 309     if (!cms_set1_SignerIdentifier(si->sid, signer, type))
 310         goto err;
 311
 312     if (md == NULL) {
 313         int def_nid;
 314         if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0)
 315             goto err;
 316         md = EVP_get_digestbynid(def_nid);
 317         if (md == NULL) {
 318             CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DEFAULT_DIGEST);
 319             goto err;
 320         }
 321     }
 322
 323     if (!md) {
 324         CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DIGEST_SET);
 325         goto err;
 326     }
 327
 328     X509_ALGOR_set_md(si->digestAlgorithm, md);
 329
 330     /* See if digest is present in digestAlgorithms */
 331     for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
 332         ASN1_OBJECT *aoid;
 333         alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 334         X509_ALGOR_get0(&aoid, NULL, NULL, alg);
 335         if (OBJ_obj2nid(aoid) == EVP_MD_type(md))
 336             break;
 337     }
 338
 339     if (i == sk_X509_ALGOR_num(sd->digestAlgorithms)) {
 340         alg = X509_ALGOR_new();
 341         if (alg == NULL)
 342             goto merr;
 343         X509_ALGOR_set_md(alg, md);
 344         if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg)) {
 345             X509_ALGOR_free(alg);
 346             goto merr;
 347         }
 348     }
 349
 350     if (!(flags & CMS_KEY_PARAM) && !cms_sd_asn1_ctrl(si, 0))
 351         goto err;
 352     if (!(flags & CMS_NOATTR)) {
 353         /*
 354          * Initialialize signed attributes strutucture so other attributes
 355          * such as signing time etc are added later even if we add none here.
 356          */
 357         if (!si->signedAttrs) {
 358             si->signedAttrs = sk_X509_ATTRIBUTE_new_null();
 359             if (!si->signedAttrs)
 360                 goto merr;
 361         }
 362
 363         if (!(flags & CMS_NOSMIMECAP)) {
 364             STACK_OF(X509_ALGOR) *smcap = NULL;
 365             i = CMS_add_standard_smimecap(&smcap);
 366             if (i)
 367                 i = CMS_add_smimecap(si, smcap);
 368             sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 369             if (!i)
 370                 goto merr;
 371         }
 372         if (flags & CMS_REUSE_DIGEST) {
 373             if (!cms_copy_messageDigest(cms, si))
 374                 goto err;
 375             if (!(flags & (CMS_PARTIAL | CMS_KEY_PARAM)) &&
 376                 !CMS_SignerInfo_sign(si))
 377                 goto err;
 378         }
 379     }
 380
 381     if (!(flags & CMS_NOCERTS)) {
 382         /* NB ignore -1 return for duplicate cert */
 383         if (!CMS_add1_cert(cms, signer))
 384             goto merr;
 385     }
 386
 387     if (flags & CMS_KEY_PARAM) {
 388         if (flags & CMS_NOATTR) {
 389             si->pctx = EVP_PKEY_CTX_new(si->pkey, NULL);
 390             if (si->pctx == NULL)
 391                 goto err;
 392             if (EVP_PKEY_sign_init(si->pctx) <= 0)
 393                 goto err;
 394             if (EVP_PKEY_CTX_set_signature_md(si->pctx, md) <= 0)
 395                 goto err;
 396         } else if (EVP_DigestSignInit(si->mctx, &si->pctx, md, NULL, pk) <=
 397                    0)
 398             goto err;
 399     }
 400
 401     if (!sd->signerInfos)
 402         sd->signerInfos = sk_CMS_SignerInfo_new_null();
 403     if (!sd->signerInfos || !sk_CMS_SignerInfo_push(sd->signerInfos, si))
 404         goto merr;
 405
 406     return si;
 407
 408  merr:
 409     CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
 410  err:
 411     M_ASN1_free_of(si, CMS_SignerInfo);
 412     return NULL;
 413
 414 }
 415
 416 static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
 417 {
 418     ASN1_TIME *tt;
 419     int r = 0;
 420     if (t)
 421         tt = t;
 422     else
 423         tt = X509_gmtime_adj(NULL, 0);
 424
 425     if (!tt)
 426         goto merr;
 427
 428     if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
 429                                     tt->type, tt, -1) <= 0)
 430         goto merr;
 431
 432     r = 1;
 433
 434  merr:
 435
 436     if (!t)
 437         ASN1_TIME_free(tt);
 438
 439     if (!r)
 440         CMSerr(CMS_F_CMS_ADD1_SIGNINGTIME, ERR_R_MALLOC_FAILURE);
 441
 442     return r;
 443
 444 }
 445
 446 EVP_PKEY_CTX *CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo *si)
 447 {
 448     return si->pctx;
 449 }
 450
 451 EVP_MD_CTX *CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo *si)
 452 {
 453     return si->mctx;
 454 }
 455
 456 STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
 457 {
 458     CMS_SignedData *sd;
 459     sd = cms_get0_signed(cms);
 460     if (!sd)
 461         return NULL;
 462     return sd->signerInfos;
 463 }
 464
 465 STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms)
 466 {
 467     STACK_OF(X509) *signers = NULL;
 468     STACK_OF(CMS_SignerInfo) *sinfos;
 469     CMS_SignerInfo *si;
 470     int i;
 471     sinfos = CMS_get0_SignerInfos(cms);
 472     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 473         si = sk_CMS_SignerInfo_value(sinfos, i);
 474         if (si->signer) {
 475             if (!signers) {
 476                 signers = sk_X509_new_null();
 477                 if (!signers)
 478                     return NULL;
 479             }
 480             if (!sk_X509_push(signers, si->signer)) {
 481                 sk_X509_free(signers);
 482                 return NULL;
 483             }
 484         }
 485     }
 486     return signers;
 487 }
 488
 489 void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
 490 {
 491     if (signer) {
 492         X509_up_ref(signer);
 493         EVP_PKEY_free(si->pkey);
 494         si->pkey = X509_get_pubkey(signer);
 495     }
 496     X509_free(si->signer);
 497     si->signer = signer;
 498 }
 499
 500 int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si,
 501                                   ASN1_OCTET_STRING **keyid,
 502                                   X509_NAME **issuer, ASN1_INTEGER **sno)
 503 {
 504     return cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
 505 }
 506
 507 int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
 508 {
 509     return cms_SignerIdentifier_cert_cmp(si->sid, cert);
 510 }
 511
 512 int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
 513                            unsigned int flags)
 514 {
 515     CMS_SignedData *sd;
 516     CMS_SignerInfo *si;
 517     CMS_CertificateChoices *cch;
 518     STACK_OF(CMS_CertificateChoices) *certs;
 519     X509 *x;
 520     int i, j;
 521     int ret = 0;
 522     sd = cms_get0_signed(cms);
 523     if (!sd)
 524         return -1;
 525     certs = sd->certificates;
 526     for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
 527         si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
 528         if (si->signer)
 529             continue;
 530
 531         for (j = 0; j < sk_X509_num(scerts); j++) {
 532             x = sk_X509_value(scerts, j);
 533             if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
 534                 CMS_SignerInfo_set1_signer_cert(si, x);
 535                 ret++;
 536                 break;
 537             }
 538         }
 539
 540         if (si->signer || (flags & CMS_NOINTERN))
 541             continue;
 542
 543         for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++) {
 544             cch = sk_CMS_CertificateChoices_value(certs, j);
 545             if (cch->type != 0)
 546                 continue;
 547             x = cch->d.certificate;
 548             if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
 549                 CMS_SignerInfo_set1_signer_cert(si, x);
 550                 ret++;
 551                 break;
 552             }
 553         }
 554     }
 555     return ret;
 556 }
 557
 558 void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk,
 559                               X509 **signer, X509_ALGOR **pdig,
 560                               X509_ALGOR **psig)
 561 {
 562     if (pk)
 563         *pk = si->pkey;
 564     if (signer)
 565         *signer = si->signer;
 566     if (pdig)
 567         *pdig = si->digestAlgorithm;
 568     if (psig)
 569         *psig = si->signatureAlgorithm;
 570 }
 571
 572 ASN1_OCTET_STRING *CMS_SignerInfo_get0_signature(CMS_SignerInfo *si)
 573 {
 574     return si->signature;
 575 }
 576
 577 static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
 578                                        CMS_SignerInfo *si, BIO *chain)
 579 {
 580     EVP_MD_CTX *mctx = EVP_MD_CTX_new();
 581     int r = 0;
 582     EVP_PKEY_CTX *pctx = NULL;
 583
 584     if (mctx == NULL) {
 585         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE);
 586         return 0;
 587     }
 588
 589     if (!si->pkey) {
 590         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_NO_PRIVATE_KEY);
 591         return 0;
 592     }
 593
 594     if (!cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
 595         goto err;
 596     /* Set SignerInfo algortihm details if we used custom parametsr */
 597     if (si->pctx && !cms_sd_asn1_ctrl(si, 0))
 598         goto err;
 599
 600     /*
 601      * If any signed attributes calculate and add messageDigest attribute
 602      */
 603
 604     if (CMS_signed_get_attr_count(si) >= 0) {
 605         ASN1_OBJECT *ctype =
 606             cms->d.signedData->encapContentInfo->eContentType;
 607         unsigned char md[EVP_MAX_MD_SIZE];
 608         unsigned int mdlen;
 609         if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
 610             goto err;
 611         if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 612                                          V_ASN1_OCTET_STRING, md, mdlen))
 613             goto err;
 614         /* Copy content type across */
 615         if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
 616                                         V_ASN1_OBJECT, ctype, -1) <= 0)
 617             goto err;
 618         if (!CMS_SignerInfo_sign(si))
 619             goto err;
 620     } else if (si->pctx) {
 621         unsigned char *sig;
 622         size_t siglen;
 623         unsigned char md[EVP_MAX_MD_SIZE];
 624         unsigned int mdlen;
 625         pctx = si->pctx;
 626         if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
 627             goto err;
 628         siglen = EVP_PKEY_size(si->pkey);
 629         sig = OPENSSL_malloc(siglen);
 630         if (sig == NULL) {
 631             CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE);
 632             goto err;
 633         }
 634         if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0) {
 635             OPENSSL_free(sig);
 636             goto err;
 637         }
 638         ASN1_STRING_set0(si->signature, sig, siglen);
 639     } else {
 640         unsigned char *sig;
 641         unsigned int siglen;
 642         sig = OPENSSL_malloc(EVP_PKEY_size(si->pkey));
 643         if (sig == NULL) {
 644             CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE);
 645             goto err;
 646         }
 647         if (!EVP_SignFinal(mctx, sig, &siglen, si->pkey)) {
 648             CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_SIGNFINAL_ERROR);
 649             OPENSSL_free(sig);
 650             goto err;
 651         }
 652         ASN1_STRING_set0(si->signature, sig, siglen);
 653     }
 654
 655     r = 1;
 656
 657  err:
 658     EVP_MD_CTX_free(mctx);
 659     EVP_PKEY_CTX_free(pctx);
 660     return r;
 661
 662 }
 663
 664 int cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
 665 {
 666     STACK_OF(CMS_SignerInfo) *sinfos;
 667     CMS_SignerInfo *si;
 668     int i;
 669     sinfos = CMS_get0_SignerInfos(cms);
 670     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 671         si = sk_CMS_SignerInfo_value(sinfos, i);
 672         if (!cms_SignerInfo_content_sign(cms, si, chain))
 673             return 0;
 674     }
 675     cms->d.signedData->encapContentInfo->partial = 0;
 676     return 1;
 677 }
 678
 679 int CMS_SignerInfo_sign(CMS_SignerInfo *si)
 680 {
 681     EVP_MD_CTX *mctx = si->mctx;
 682     EVP_PKEY_CTX *pctx;
 683     unsigned char *abuf = NULL;
 684     int alen;
 685     size_t siglen;
 686     const EVP_MD *md = NULL;
 687
 688     md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 689     if (md == NULL)
 690         return 0;
 691
 692     if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0) {
 693         if (!cms_add1_signingTime(si, NULL))
 694             goto err;
 695     }
 696
 697     if (si->pctx)
 698         pctx = si->pctx;
 699     else {
 700         EVP_MD_CTX_reset(mctx);
 701         if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0)
 702             goto err;
 703     }
 704
 705     if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 706                           EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0) {
 707         CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 708         goto err;
 709     }
 710
 711     alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
 712                          ASN1_ITEM_rptr(CMS_Attributes_Sign));
 713     if (!abuf)
 714         goto err;
 715     if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
 716         goto err;
 717     if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
 718         goto err;
 719     OPENSSL_free(abuf);
 720     abuf = OPENSSL_malloc(siglen);
 721     if (abuf == NULL)
 722         goto err;
 723     if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
 724         goto err;
 725
 726     if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 727                           EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0) {
 728         CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 729         goto err;
 730     }
 731
 732     EVP_MD_CTX_reset(mctx);
 733
 734     ASN1_STRING_set0(si->signature, abuf, siglen);
 735
 736     return 1;
 737
 738  err:
 739     OPENSSL_free(abuf);
 740     EVP_MD_CTX_reset(mctx);
 741     return 0;
 742
 743 }
 744
 745 int CMS_SignerInfo_verify(CMS_SignerInfo *si)
 746 {
 747     EVP_MD_CTX *mctx = NULL;
 748     unsigned char *abuf = NULL;
 749     int alen, r = -1;
 750     const EVP_MD *md = NULL;
 751
 752     if (!si->pkey) {
 753         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_NO_PUBLIC_KEY);
 754         return -1;
 755     }
 756
 757     md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 758     if (md == NULL)
 759         return -1;
 760     if (si->mctx == NULL)
 761         si->mctx = EVP_MD_CTX_new();
 762     mctx = si->mctx;
 763     if (EVP_DigestVerifyInit(mctx, &si->pctx, md, NULL, si->pkey) <= 0)
 764         goto err;
 765
 766     if (!cms_sd_asn1_ctrl(si, 1))
 767         goto err;
 768
 769     alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
 770                          ASN1_ITEM_rptr(CMS_Attributes_Verify));
 771     if (!abuf)
 772         goto err;
 773     r = EVP_DigestVerifyUpdate(mctx, abuf, alen);
 774     OPENSSL_free(abuf);
 775     if (r <= 0) {
 776         r = -1;
 777         goto err;
 778     }
 779     r = EVP_DigestVerifyFinal(mctx,
 780                               si->signature->data, si->signature->length);
 781     if (r <= 0)
 782         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_VERIFICATION_FAILURE);
 783  err:
 784     EVP_MD_CTX_reset(mctx);
 785     return r;
 786 }
 787
 788 /* Create a chain of digest BIOs from a CMS ContentInfo */
 789
 790 BIO *cms_SignedData_init_bio(CMS_ContentInfo *cms)
 791 {
 792     int i;
 793     CMS_SignedData *sd;
 794     BIO *chain = NULL;
 795     sd = cms_get0_signed(cms);
 796     if (!sd)
 797         return NULL;
 798     if (cms->d.signedData->encapContentInfo->partial)
 799         cms_sd_set_version(sd);
 800     for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
 801         X509_ALGOR *digestAlgorithm;
 802         BIO *mdbio;
 803         digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 804         mdbio = cms_DigestAlgorithm_init_bio(digestAlgorithm);
 805         if (!mdbio)
 806             goto err;
 807         if (chain)
 808             BIO_push(chain, mdbio);
 809         else
 810             chain = mdbio;
 811     }
 812     return chain;
 813  err:
 814     BIO_free_all(chain);
 815     return NULL;
 816 }
 817
 818 int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
 819 {
 820     ASN1_OCTET_STRING *os = NULL;
 821     EVP_MD_CTX *mctx = EVP_MD_CTX_new();
 822     EVP_PKEY_CTX *pkctx = NULL;
 823     int r = -1;
 824     unsigned char mval[EVP_MAX_MD_SIZE];
 825     unsigned int mlen;
 826
 827     if (mctx == NULL) {
 828         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT, ERR_R_MALLOC_FAILURE);
 829         goto err;
 830     }
 831     /* If we have any signed attributes look for messageDigest value */
 832     if (CMS_signed_get_attr_count(si) >= 0) {
 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             CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 838                    CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 839             goto err;
 840         }
 841     }
 842
 843     if (!cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
 844         goto err;
 845
 846     if (EVP_DigestFinal_ex(mctx, mval, &mlen) <= 0) {
 847         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 848                CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
 849         goto err;
 850     }
 851
 852     /* If messageDigest found compare it */
 853
 854     if (os) {
 855         if (mlen != (unsigned int)os->length) {
 856             CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 857                    CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
 858             goto err;
 859         }
 860
 861         if (memcmp(mval, os->data, mlen)) {
 862             CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 863                    CMS_R_VERIFICATION_FAILURE);
 864             r = 0;
 865         } else
 866             r = 1;
 867     } else {
 868         const EVP_MD *md = EVP_MD_CTX_md(mctx);
 869         pkctx = EVP_PKEY_CTX_new(si->pkey, NULL);
 870         if (pkctx == NULL)
 871             goto err;
 872         if (EVP_PKEY_verify_init(pkctx) <= 0)
 873             goto err;
 874         if (EVP_PKEY_CTX_set_signature_md(pkctx, md) <= 0)
 875             goto err;
 876         si->pctx = pkctx;
 877         if (!cms_sd_asn1_ctrl(si, 1))
 878             goto err;
 879         r = EVP_PKEY_verify(pkctx, si->signature->data,
 880                             si->signature->length, mval, mlen);
 881         if (r <= 0) {
 882             CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 883                    CMS_R_VERIFICATION_FAILURE);
 884             r = 0;
 885         }
 886     }
 887
 888  err:
 889     EVP_PKEY_CTX_free(pkctx);
 890     EVP_MD_CTX_free(mctx);
 891     return r;
 892
 893 }
 894
 895 int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
 896 {
 897     unsigned char *smder = NULL;
 898     int smderlen, r;
 899     smderlen = i2d_X509_ALGORS(algs, &smder);
 900     if (smderlen <= 0)
 901         return 0;
 902     r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
 903                                     V_ASN1_SEQUENCE, smder, smderlen);
 904     OPENSSL_free(smder);
 905     return r;
 906 }
 907
 908 int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
 909                             int algnid, int keysize)
 910 {
 911     X509_ALGOR *alg;
 912     ASN1_INTEGER *key = NULL;
 913     if (keysize > 0) {
 914         key = ASN1_INTEGER_new();
 915         if (key == NULL || !ASN1_INTEGER_set(key, keysize))
 916             return 0;
 917     }
 918     alg = X509_ALGOR_new();
 919     if (alg == NULL) {
 920         ASN1_INTEGER_free(key);
 921         return 0;
 922     }
 923
 924     X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
 925                     key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key);
 926     if (*algs == NULL)
 927         *algs = sk_X509_ALGOR_new_null();
 928     if (*algs == NULL || !sk_X509_ALGOR_push(*algs, alg)) {
 929         X509_ALGOR_free(alg);
 930         return 0;
 931     }
 932     return 1;
 933 }
 934
 935 /* Check to see if a cipher exists and if so add S/MIME capabilities */
 936
 937 static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
 938 {
 939     if (EVP_get_cipherbynid(nid))
 940         return CMS_add_simple_smimecap(sk, nid, arg);
 941     return 1;
 942 }
 943
 944 static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
 945 {
 946     if (EVP_get_digestbynid(nid))
 947         return CMS_add_simple_smimecap(sk, nid, arg);
 948     return 1;
 949 }
 950
 951 int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
 952 {
 953     if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
 954         || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
 955         || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -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 }