crypto/cms/cms_sd.c

   1 /*
   2  * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "internal/cryptlib.h"
  11 #include <openssl/asn1t.h>
  12 #include <openssl/pem.h>
  13 #include <openssl/x509.h>
  14 #include <openssl/x509v3.h>
  15 #include <openssl/err.h>
  16 #include <openssl/cms.h>
  17 #include "cms_lcl.h"
  18 #include "internal/asn1_int.h"
  19 #include "internal/evp_int.h"
  20
  21 /* CMS SignedData Utilities */
  22
  23 static CMS_SignedData *cms_get0_signed(CMS_ContentInfo *cms)
  24 {
  25     if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed) {
  26         CMSerr(CMS_F_CMS_GET0_SIGNED, CMS_R_CONTENT_TYPE_NOT_SIGNED_DATA);
  27         return NULL;
  28     }
  29     return cms->d.signedData;
  30 }
  31
  32 static CMS_SignedData *cms_signed_data_init(CMS_ContentInfo *cms)
  33 {
  34     if (cms->d.other == NULL) {
  35         cms->d.signedData = M_ASN1_new_of(CMS_SignedData);
  36         if (!cms->d.signedData) {
  37             CMSerr(CMS_F_CMS_SIGNED_DATA_INIT, ERR_R_MALLOC_FAILURE);
  38             return NULL;
  39         }
  40         cms->d.signedData->version = 1;
  41         cms->d.signedData->encapContentInfo->eContentType =
  42             OBJ_nid2obj(NID_pkcs7_data);
  43         cms->d.signedData->encapContentInfo->partial = 1;
  44         ASN1_OBJECT_free(cms->contentType);
  45         cms->contentType = OBJ_nid2obj(NID_pkcs7_signed);
  46         return cms->d.signedData;
  47     }
  48     return cms_get0_signed(cms);
  49 }
  50
  51 /* Just initialise SignedData e.g. for certs only structure */
  52
  53 int CMS_SignedData_init(CMS_ContentInfo *cms)
  54 {
  55     if (cms_signed_data_init(cms))
  56         return 1;
  57     else
  58         return 0;
  59 }
  60
  61 /* Check structures and fixup version numbers (if necessary) */
  62
  63 static void cms_sd_set_version(CMS_SignedData *sd)
  64 {
  65     int i;
  66     CMS_CertificateChoices *cch;
  67     CMS_RevocationInfoChoice *rch;
  68     CMS_SignerInfo *si;
  69
  70     for (i = 0; i < sk_CMS_CertificateChoices_num(sd->certificates); i++) {
  71         cch = sk_CMS_CertificateChoices_value(sd->certificates, i);
  72         if (cch->type == CMS_CERTCHOICE_OTHER) {
  73             if (sd->version < 5)
  74                 sd->version = 5;
  75         } else if (cch->type == CMS_CERTCHOICE_V2ACERT) {
  76             if (sd->version < 4)
  77                 sd->version = 4;
  78         } else if (cch->type == CMS_CERTCHOICE_V1ACERT) {
  79             if (sd->version < 3)
  80                 sd->version = 3;
  81         }
  82     }
  83
  84     for (i = 0; i < sk_CMS_RevocationInfoChoice_num(sd->crls); i++) {
  85         rch = sk_CMS_RevocationInfoChoice_value(sd->crls, i);
  86         if (rch->type == CMS_REVCHOICE_OTHER) {
  87             if (sd->version < 5)
  88                 sd->version = 5;
  89         }
  90     }
  91
  92     if ((OBJ_obj2nid(sd->encapContentInfo->eContentType) != NID_pkcs7_data)
  93         && (sd->version < 3))
  94         sd->version = 3;
  95
  96     for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
  97         si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
  98         if (si->sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
  99             if (si->version < 3)
 100                 si->version = 3;
 101             if (sd->version < 3)
 102                 sd->version = 3;
 103         } else if (si->version < 1)
 104             si->version = 1;
 105     }
 106
 107     if (sd->version < 1)
 108         sd->version = 1;
 109
 110 }
 111
 112 /* Copy an existing messageDigest value */
 113
 114 static int cms_copy_messageDigest(CMS_ContentInfo *cms, CMS_SignerInfo *si)
 115 {
 116     STACK_OF(CMS_SignerInfo) *sinfos;
 117     CMS_SignerInfo *sitmp;
 118     int i;
 119     sinfos = CMS_get0_SignerInfos(cms);
 120     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 121         ASN1_OCTET_STRING *messageDigest;
 122         sitmp = sk_CMS_SignerInfo_value(sinfos, i);
 123         if (sitmp == si)
 124             continue;
 125         if (CMS_signed_get_attr_count(sitmp) < 0)
 126             continue;
 127         if (OBJ_cmp(si->digestAlgorithm->algorithm,
 128                     sitmp->digestAlgorithm->algorithm))
 129             continue;
 130         messageDigest = CMS_signed_get0_data_by_OBJ(sitmp,
 131                                                     OBJ_nid2obj
 132                                                     (NID_pkcs9_messageDigest),
 133                                                     -3, V_ASN1_OCTET_STRING);
 134         if (!messageDigest) {
 135             CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST,
 136                    CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 137             return 0;
 138         }
 139
 140         if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 141                                         V_ASN1_OCTET_STRING,
 142                                         messageDigest, -1))
 143             return 1;
 144         else
 145             return 0;
 146     }
 147     CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST, CMS_R_NO_MATCHING_DIGEST);
 148     return 0;
 149 }
 150
 151 int cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert, int type)
 152 {
 153     switch (type) {
 154     case CMS_SIGNERINFO_ISSUER_SERIAL:
 155         if (!cms_set1_ias(&sid->d.issuerAndSerialNumber, cert))
 156             return 0;
 157         break;
 158
 159     case CMS_SIGNERINFO_KEYIDENTIFIER:
 160         if (!cms_set1_keyid(&sid->d.subjectKeyIdentifier, cert))
 161             return 0;
 162         break;
 163
 164     default:
 165         CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, CMS_R_UNKNOWN_ID);
 166         return 0;
 167     }
 168
 169     sid->type = type;
 170
 171     return 1;
 172 }
 173
 174 int cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier *sid,
 175                                         ASN1_OCTET_STRING **keyid,
 176                                         X509_NAME **issuer,
 177                                         ASN1_INTEGER **sno)
 178 {
 179     if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL) {
 180         if (issuer)
 181             *issuer = sid->d.issuerAndSerialNumber->issuer;
 182         if (sno)
 183             *sno = sid->d.issuerAndSerialNumber->serialNumber;
 184     } else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
 185         if (keyid)
 186             *keyid = sid->d.subjectKeyIdentifier;
 187     } else
 188         return 0;
 189     return 1;
 190 }
 191
 192 int cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert)
 193 {
 194     if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
 195         return cms_ias_cert_cmp(sid->d.issuerAndSerialNumber, cert);
 196     else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
 197         return cms_keyid_cert_cmp(sid->d.subjectKeyIdentifier, cert);
 198     else
 199         return -1;
 200 }
 201
 202 static int cms_sd_asn1_ctrl(CMS_SignerInfo *si, int cmd)
 203 {
 204     EVP_PKEY *pkey = si->pkey;
 205     int i;
 206     if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
 207         return 1;
 208     i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_SIGN, cmd, si);
 209     if (i == -2) {
 210         CMSerr(CMS_F_CMS_SD_ASN1_CTRL, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 211         return 0;
 212     }
 213     if (i <= 0) {
 214         CMSerr(CMS_F_CMS_SD_ASN1_CTRL, CMS_R_CTRL_FAILURE);
 215         return 0;
 216     }
 217     return 1;
 218 }
 219
 220 CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms,
 221                                 X509 *signer, EVP_PKEY *pk, const EVP_MD *md,
 222                                 unsigned int flags)
 223 {
 224     CMS_SignedData *sd;
 225     CMS_SignerInfo *si = NULL;
 226     X509_ALGOR *alg;
 227     int i, type;
 228     if (!X509_check_private_key(signer, pk)) {
 229         CMSerr(CMS_F_CMS_ADD1_SIGNER,
 230                CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 231         return NULL;
 232     }
 233     sd = cms_signed_data_init(cms);
 234     if (!sd)
 235         goto err;
 236     si = M_ASN1_new_of(CMS_SignerInfo);
 237     if (!si)
 238         goto merr;
 239     /* Call for side-effect of computing hash and caching extensions */
 240     X509_check_purpose(signer, -1, -1);
 241
 242     X509_up_ref(signer);
 243     EVP_PKEY_up_ref(pk);
 244
 245     si->pkey = pk;
 246     si->signer = signer;
 247     si->mctx = EVP_MD_CTX_new();
 248     si->pctx = NULL;
 249
 250     if (si->mctx == NULL) {
 251         CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
 252         goto err;
 253     }
 254
 255     if (flags & CMS_USE_KEYID) {
 256         si->version = 3;
 257         if (sd->version < 3)
 258             sd->version = 3;
 259         type = CMS_SIGNERINFO_KEYIDENTIFIER;
 260     } else {
 261         type = CMS_SIGNERINFO_ISSUER_SERIAL;
 262         si->version = 1;
 263     }
 264
 265     if (!cms_set1_SignerIdentifier(si->sid, signer, type))
 266         goto err;
 267
 268     if (md == NULL) {
 269         int def_nid;
 270         if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0)
 271             goto err;
 272         md = EVP_get_digestbynid(def_nid);
 273         if (md == NULL) {
 274             CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DEFAULT_DIGEST);
 275             goto err;
 276         }
 277     }
 278
 279     if (!md) {
 280         CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DIGEST_SET);
 281         goto err;
 282     }
 283
 284     X509_ALGOR_set_md(si->digestAlgorithm, md);
 285
 286     /* See if digest is present in digestAlgorithms */
 287     for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
 288         const ASN1_OBJECT *aoid;
 289         alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 290         X509_ALGOR_get0(&aoid, NULL, NULL, alg);
 291         if (OBJ_obj2nid(aoid) == EVP_MD_type(md))
 292             break;
 293     }
 294
 295     if (i == sk_X509_ALGOR_num(sd->digestAlgorithms)) {
 296         alg = X509_ALGOR_new();
 297         if (alg == NULL)
 298             goto merr;
 299         X509_ALGOR_set_md(alg, md);
 300         if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg)) {
 301             X509_ALGOR_free(alg);
 302             goto merr;
 303         }
 304     }
 305
 306     if (!(flags & CMS_KEY_PARAM) && !cms_sd_asn1_ctrl(si, 0))
 307         goto err;
 308     if (!(flags & CMS_NOATTR)) {
 309         /*
 310          * Initialize signed attributes structure so other attributes
 311          * such as signing time etc are added later even if we add none here.
 312          */
 313         if (!si->signedAttrs) {
 314             si->signedAttrs = sk_X509_ATTRIBUTE_new_null();
 315             if (!si->signedAttrs)
 316                 goto merr;
 317         }
 318
 319         if (!(flags & CMS_NOSMIMECAP)) {
 320             STACK_OF(X509_ALGOR) *smcap = NULL;
 321             i = CMS_add_standard_smimecap(&smcap);
 322             if (i)
 323                 i = CMS_add_smimecap(si, smcap);
 324             sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 325             if (!i)
 326                 goto merr;
 327         }
 328         if (flags & CMS_REUSE_DIGEST) {
 329             if (!cms_copy_messageDigest(cms, si))
 330                 goto err;
 331             if (!(flags & (CMS_PARTIAL | CMS_KEY_PARAM)) &&
 332                 !CMS_SignerInfo_sign(si))
 333                 goto err;
 334         }
 335         if (flags & CMS_CADES) {
 336             ESS_SIGNING_CERT *sc = NULL;
 337             ESS_SIGNING_CERT_V2 *sc2 = NULL;
 338             int add_sc;
 339
 340             if (md == EVP_sha1() || md == NULL) {
 341                 if ((sc = ESS_SIGNING_CERT_new_init(signer,
 342                                                     NULL, 1)) == NULL)
 343                     goto err;
 344                 add_sc = CMS_add1_signing_cert(si, sc);
 345                 ESS_SIGNING_CERT_free(sc);
 346             } else {
 347                 if ((sc2 = ESS_SIGNING_CERT_V2_new_init(md, signer,
 348                                                         NULL, 1)) == NULL)
 349                     goto err;
 350                 add_sc = CMS_add1_signing_cert_v2(si, sc2);
 351                 ESS_SIGNING_CERT_V2_free(sc2);
 352             }
 353             if (!add_sc)
 354                 goto err;
 355         }
 356     }
 357
 358     if (!(flags & CMS_NOCERTS)) {
 359         /* NB ignore -1 return for duplicate cert */
 360         if (!CMS_add1_cert(cms, signer))
 361             goto merr;
 362     }
 363
 364     if (flags & CMS_KEY_PARAM) {
 365         if (flags & CMS_NOATTR) {
 366             si->pctx = EVP_PKEY_CTX_new(si->pkey, NULL);
 367             if (si->pctx == NULL)
 368                 goto err;
 369             if (EVP_PKEY_sign_init(si->pctx) <= 0)
 370                 goto err;
 371             if (EVP_PKEY_CTX_set_signature_md(si->pctx, md) <= 0)
 372                 goto err;
 373         } else if (EVP_DigestSignInit(si->mctx, &si->pctx, md, NULL, pk) <=
 374                    0)
 375             goto err;
 376     }
 377
 378     if (!sd->signerInfos)
 379         sd->signerInfos = sk_CMS_SignerInfo_new_null();
 380     if (!sd->signerInfos || !sk_CMS_SignerInfo_push(sd->signerInfos, si))
 381         goto merr;
 382
 383     return si;
 384
 385  merr:
 386     CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
 387  err:
 388     M_ASN1_free_of(si, CMS_SignerInfo);
 389     return NULL;
 390
 391 }
 392
 393 static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
 394 {
 395     ASN1_TIME *tt;
 396     int r = 0;
 397     if (t)
 398         tt = t;
 399     else
 400         tt = X509_gmtime_adj(NULL, 0);
 401
 402     if (!tt)
 403         goto merr;
 404
 405     if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
 406                                     tt->type, tt, -1) <= 0)
 407         goto merr;
 408
 409     r = 1;
 410
 411  merr:
 412
 413     if (!t)
 414         ASN1_TIME_free(tt);
 415
 416     if (!r)
 417         CMSerr(CMS_F_CMS_ADD1_SIGNINGTIME, ERR_R_MALLOC_FAILURE);
 418
 419     return r;
 420
 421 }
 422
 423 EVP_PKEY_CTX *CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo *si)
 424 {
 425     return si->pctx;
 426 }
 427
 428 EVP_MD_CTX *CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo *si)
 429 {
 430     return si->mctx;
 431 }
 432
 433 STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
 434 {
 435     CMS_SignedData *sd;
 436     sd = cms_get0_signed(cms);
 437     if (!sd)
 438         return NULL;
 439     return sd->signerInfos;
 440 }
 441
 442 STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms)
 443 {
 444     STACK_OF(X509) *signers = NULL;
 445     STACK_OF(CMS_SignerInfo) *sinfos;
 446     CMS_SignerInfo *si;
 447     int i;
 448     sinfos = CMS_get0_SignerInfos(cms);
 449     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 450         si = sk_CMS_SignerInfo_value(sinfos, i);
 451         if (si->signer) {
 452             if (!signers) {
 453                 signers = sk_X509_new_null();
 454                 if (!signers)
 455                     return NULL;
 456             }
 457             if (!sk_X509_push(signers, si->signer)) {
 458                 sk_X509_free(signers);
 459                 return NULL;
 460             }
 461         }
 462     }
 463     return signers;
 464 }
 465
 466 void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
 467 {
 468     if (signer) {
 469         X509_up_ref(signer);
 470         EVP_PKEY_free(si->pkey);
 471         si->pkey = X509_get_pubkey(signer);
 472     }
 473     X509_free(si->signer);
 474     si->signer = signer;
 475 }
 476
 477 int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si,
 478                                   ASN1_OCTET_STRING **keyid,
 479                                   X509_NAME **issuer, ASN1_INTEGER **sno)
 480 {
 481     return cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
 482 }
 483
 484 int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
 485 {
 486     return cms_SignerIdentifier_cert_cmp(si->sid, cert);
 487 }
 488
 489 int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
 490                            unsigned int flags)
 491 {
 492     CMS_SignedData *sd;
 493     CMS_SignerInfo *si;
 494     CMS_CertificateChoices *cch;
 495     STACK_OF(CMS_CertificateChoices) *certs;
 496     X509 *x;
 497     int i, j;
 498     int ret = 0;
 499     sd = cms_get0_signed(cms);
 500     if (!sd)
 501         return -1;
 502     certs = sd->certificates;
 503     for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
 504         si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
 505         if (si->signer)
 506             continue;
 507
 508         for (j = 0; j < sk_X509_num(scerts); j++) {
 509             x = sk_X509_value(scerts, j);
 510             if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
 511                 CMS_SignerInfo_set1_signer_cert(si, x);
 512                 ret++;
 513                 break;
 514             }
 515         }
 516
 517         if (si->signer || (flags & CMS_NOINTERN))
 518             continue;
 519
 520         for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++) {
 521             cch = sk_CMS_CertificateChoices_value(certs, j);
 522             if (cch->type != 0)
 523                 continue;
 524             x = cch->d.certificate;
 525             if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
 526                 CMS_SignerInfo_set1_signer_cert(si, x);
 527                 ret++;
 528                 break;
 529             }
 530         }
 531     }
 532     return ret;
 533 }
 534
 535 void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk,
 536                               X509 **signer, X509_ALGOR **pdig,
 537                               X509_ALGOR **psig)
 538 {
 539     if (pk)
 540         *pk = si->pkey;
 541     if (signer)
 542         *signer = si->signer;
 543     if (pdig)
 544         *pdig = si->digestAlgorithm;
 545     if (psig)
 546         *psig = si->signatureAlgorithm;
 547 }
 548
 549 ASN1_OCTET_STRING *CMS_SignerInfo_get0_signature(CMS_SignerInfo *si)
 550 {
 551     return si->signature;
 552 }
 553
 554 static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
 555                                        CMS_SignerInfo *si, BIO *chain)
 556 {
 557     EVP_MD_CTX *mctx = EVP_MD_CTX_new();
 558     int r = 0;
 559     EVP_PKEY_CTX *pctx = NULL;
 560
 561     if (mctx == NULL) {
 562         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE);
 563         return 0;
 564     }
 565
 566     if (!si->pkey) {
 567         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_NO_PRIVATE_KEY);
 568         goto err;
 569     }
 570
 571     if (!cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
 572         goto err;
 573     /* Set SignerInfo algorithm details if we used custom parameter */
 574     if (si->pctx && !cms_sd_asn1_ctrl(si, 0))
 575         goto err;
 576
 577     /*
 578      * If any signed attributes calculate and add messageDigest attribute
 579      */
 580
 581     if (CMS_signed_get_attr_count(si) >= 0) {
 582         ASN1_OBJECT *ctype =
 583             cms->d.signedData->encapContentInfo->eContentType;
 584         unsigned char md[EVP_MAX_MD_SIZE];
 585         unsigned int mdlen;
 586         if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
 587             goto err;
 588         if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 589                                          V_ASN1_OCTET_STRING, md, mdlen))
 590             goto err;
 591         /* Copy content type across */
 592         if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
 593                                         V_ASN1_OBJECT, ctype, -1) <= 0)
 594             goto err;
 595         if (!CMS_SignerInfo_sign(si))
 596             goto err;
 597     } else if (si->pctx) {
 598         unsigned char *sig;
 599         size_t siglen;
 600         unsigned char md[EVP_MAX_MD_SIZE];
 601         unsigned int mdlen;
 602         pctx = si->pctx;
 603         if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
 604             goto err;
 605         siglen = EVP_PKEY_size(si->pkey);
 606         sig = OPENSSL_malloc(siglen);
 607         if (sig == NULL) {
 608             CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE);
 609             goto err;
 610         }
 611         if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0) {
 612             OPENSSL_free(sig);
 613             goto err;
 614         }
 615         ASN1_STRING_set0(si->signature, sig, siglen);
 616     } else {
 617         unsigned char *sig;
 618         unsigned int siglen;
 619         sig = OPENSSL_malloc(EVP_PKEY_size(si->pkey));
 620         if (sig == NULL) {
 621             CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE);
 622             goto err;
 623         }
 624         if (!EVP_SignFinal(mctx, sig, &siglen, si->pkey)) {
 625             CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_SIGNFINAL_ERROR);
 626             OPENSSL_free(sig);
 627             goto err;
 628         }
 629         ASN1_STRING_set0(si->signature, sig, siglen);
 630     }
 631
 632     r = 1;
 633
 634  err:
 635     EVP_MD_CTX_free(mctx);
 636     EVP_PKEY_CTX_free(pctx);
 637     return r;
 638
 639 }
 640
 641 int cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
 642 {
 643     STACK_OF(CMS_SignerInfo) *sinfos;
 644     CMS_SignerInfo *si;
 645     int i;
 646     sinfos = CMS_get0_SignerInfos(cms);
 647     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 648         si = sk_CMS_SignerInfo_value(sinfos, i);
 649         if (!cms_SignerInfo_content_sign(cms, si, chain))
 650             return 0;
 651     }
 652     cms->d.signedData->encapContentInfo->partial = 0;
 653     return 1;
 654 }
 655
 656 int CMS_SignerInfo_sign(CMS_SignerInfo *si)
 657 {
 658     EVP_MD_CTX *mctx = si->mctx;
 659     EVP_PKEY_CTX *pctx = NULL;
 660     unsigned char *abuf = NULL;
 661     int alen;
 662     size_t siglen;
 663     const EVP_MD *md = NULL;
 664
 665     md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 666     if (md == NULL)
 667         return 0;
 668
 669     if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0) {
 670         if (!cms_add1_signingTime(si, NULL))
 671             goto err;
 672     }
 673
 674     if (si->pctx)
 675         pctx = si->pctx;
 676     else {
 677         EVP_MD_CTX_reset(mctx);
 678         if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0)
 679             goto err;
 680         si->pctx = pctx;
 681     }
 682
 683     if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 684                           EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0) {
 685         CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 686         goto err;
 687     }
 688
 689     alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
 690                          ASN1_ITEM_rptr(CMS_Attributes_Sign));
 691     if (!abuf)
 692         goto err;
 693     if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
 694         goto err;
 695     if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
 696         goto err;
 697     OPENSSL_free(abuf);
 698     abuf = OPENSSL_malloc(siglen);
 699     if (abuf == NULL)
 700         goto err;
 701     if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
 702         goto err;
 703
 704     if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 705                           EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0) {
 706         CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 707         goto err;
 708     }
 709
 710     EVP_MD_CTX_reset(mctx);
 711
 712     ASN1_STRING_set0(si->signature, abuf, siglen);
 713
 714     return 1;
 715
 716  err:
 717     OPENSSL_free(abuf);
 718     EVP_MD_CTX_reset(mctx);
 719     return 0;
 720
 721 }
 722
 723 int CMS_SignerInfo_verify(CMS_SignerInfo *si)
 724 {
 725     EVP_MD_CTX *mctx = NULL;
 726     unsigned char *abuf = NULL;
 727     int alen, r = -1;
 728     const EVP_MD *md = NULL;
 729
 730     if (!si->pkey) {
 731         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_NO_PUBLIC_KEY);
 732         return -1;
 733     }
 734
 735     md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 736     if (md == NULL)
 737         return -1;
 738     if (si->mctx == NULL && (si->mctx = EVP_MD_CTX_new()) == NULL) {
 739         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, ERR_R_MALLOC_FAILURE);
 740         return -1;
 741     }
 742     mctx = si->mctx;
 743     if (EVP_DigestVerifyInit(mctx, &si->pctx, md, NULL, si->pkey) <= 0)
 744         goto err;
 745
 746     if (!cms_sd_asn1_ctrl(si, 1))
 747         goto err;
 748
 749     alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
 750                          ASN1_ITEM_rptr(CMS_Attributes_Verify));
 751     if (!abuf)
 752         goto err;
 753     r = EVP_DigestVerifyUpdate(mctx, abuf, alen);
 754     OPENSSL_free(abuf);
 755     if (r <= 0) {
 756         r = -1;
 757         goto err;
 758     }
 759     r = EVP_DigestVerifyFinal(mctx,
 760                               si->signature->data, si->signature->length);
 761     if (r <= 0)
 762         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_VERIFICATION_FAILURE);
 763  err:
 764     EVP_MD_CTX_reset(mctx);
 765     return r;
 766 }
 767
 768 /* Create a chain of digest BIOs from a CMS ContentInfo */
 769
 770 BIO *cms_SignedData_init_bio(CMS_ContentInfo *cms)
 771 {
 772     int i;
 773     CMS_SignedData *sd;
 774     BIO *chain = NULL;
 775     sd = cms_get0_signed(cms);
 776     if (!sd)
 777         return NULL;
 778     if (cms->d.signedData->encapContentInfo->partial)
 779         cms_sd_set_version(sd);
 780     for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
 781         X509_ALGOR *digestAlgorithm;
 782         BIO *mdbio;
 783         digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 784         mdbio = cms_DigestAlgorithm_init_bio(digestAlgorithm);
 785         if (!mdbio)
 786             goto err;
 787         if (chain)
 788             BIO_push(chain, mdbio);
 789         else
 790             chain = mdbio;
 791     }
 792     return chain;
 793  err:
 794     BIO_free_all(chain);
 795     return NULL;
 796 }
 797
 798 int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
 799 {
 800     ASN1_OCTET_STRING *os = NULL;
 801     EVP_MD_CTX *mctx = EVP_MD_CTX_new();
 802     EVP_PKEY_CTX *pkctx = NULL;
 803     int r = -1;
 804     unsigned char mval[EVP_MAX_MD_SIZE];
 805     unsigned int mlen;
 806
 807     if (mctx == NULL) {
 808         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT, ERR_R_MALLOC_FAILURE);
 809         goto err;
 810     }
 811     /* If we have any signed attributes look for messageDigest value */
 812     if (CMS_signed_get_attr_count(si) >= 0) {
 813         os = CMS_signed_get0_data_by_OBJ(si,
 814                                          OBJ_nid2obj(NID_pkcs9_messageDigest),
 815                                          -3, V_ASN1_OCTET_STRING);
 816         if (!os) {
 817             CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 818                    CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 819             goto err;
 820         }
 821     }
 822
 823     if (!cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
 824         goto err;
 825
 826     if (EVP_DigestFinal_ex(mctx, mval, &mlen) <= 0) {
 827         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 828                CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
 829         goto err;
 830     }
 831
 832     /* If messageDigest found compare it */
 833
 834     if (os) {
 835         if (mlen != (unsigned int)os->length) {
 836             CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 837                    CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
 838             goto err;
 839         }
 840
 841         if (memcmp(mval, os->data, mlen)) {
 842             CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 843                    CMS_R_VERIFICATION_FAILURE);
 844             r = 0;
 845         } else
 846             r = 1;
 847     } else {
 848         const EVP_MD *md = EVP_MD_CTX_md(mctx);
 849         pkctx = EVP_PKEY_CTX_new(si->pkey, NULL);
 850         if (pkctx == NULL)
 851             goto err;
 852         if (EVP_PKEY_verify_init(pkctx) <= 0)
 853             goto err;
 854         if (EVP_PKEY_CTX_set_signature_md(pkctx, md) <= 0)
 855             goto err;
 856         si->pctx = pkctx;
 857         if (!cms_sd_asn1_ctrl(si, 1))
 858             goto err;
 859         r = EVP_PKEY_verify(pkctx, si->signature->data,
 860                             si->signature->length, mval, mlen);
 861         if (r <= 0) {
 862             CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 863                    CMS_R_VERIFICATION_FAILURE);
 864             r = 0;
 865         }
 866     }
 867
 868  err:
 869     EVP_PKEY_CTX_free(pkctx);
 870     EVP_MD_CTX_free(mctx);
 871     return r;
 872
 873 }
 874
 875 int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
 876 {
 877     unsigned char *smder = NULL;
 878     int smderlen, r;
 879     smderlen = i2d_X509_ALGORS(algs, &smder);
 880     if (smderlen <= 0)
 881         return 0;
 882     r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
 883                                     V_ASN1_SEQUENCE, smder, smderlen);
 884     OPENSSL_free(smder);
 885     return r;
 886 }
 887
 888 int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
 889                             int algnid, int keysize)
 890 {
 891     X509_ALGOR *alg;
 892     ASN1_INTEGER *key = NULL;
 893     if (keysize > 0) {
 894         key = ASN1_INTEGER_new();
 895         if (key == NULL || !ASN1_INTEGER_set(key, keysize))
 896             return 0;
 897     }
 898     alg = X509_ALGOR_new();
 899     if (alg == NULL) {
 900         ASN1_INTEGER_free(key);
 901         return 0;
 902     }
 903
 904     X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
 905                     key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key);
 906     if (*algs == NULL)
 907         *algs = sk_X509_ALGOR_new_null();
 908     if (*algs == NULL || !sk_X509_ALGOR_push(*algs, alg)) {
 909         X509_ALGOR_free(alg);
 910         return 0;
 911     }
 912     return 1;
 913 }
 914
 915 /* Check to see if a cipher exists and if so add S/MIME capabilities */
 916
 917 static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
 918 {
 919     if (EVP_get_cipherbynid(nid))
 920         return CMS_add_simple_smimecap(sk, nid, arg);
 921     return 1;
 922 }
 923
 924 static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
 925 {
 926     if (EVP_get_digestbynid(nid))
 927         return CMS_add_simple_smimecap(sk, nid, arg);
 928     return 1;
 929 }
 930
 931 int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
 932 {
 933     if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
 934         || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
 935         || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
 936         || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
 937         || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
 938         || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
 939         || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
 940         || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
 941         || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
 942         || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
 943         || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
 944         || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
 945         return 0;
 946     return 1;
 947 }