crypto/cms/cms_sd.c

   1 /*
   2  * Copyright 2008-2020 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 <openssl/ess.h>
  18 #include "cms_local.h"
  19 #include "crypto/asn1.h"
  20 #include "crypto/evp.h"
  21 #include "crypto/cms.h"
  22 #include "crypto/ess.h"
  23 #include "crypto/x509.h" /* for X509_add_cert_new() */
  24
  25 DEFINE_STACK_OF(CMS_RevocationInfoChoice)
  26 DEFINE_STACK_OF(CMS_SignerInfo)
  27 DEFINE_STACK_OF(X509)
  28 DEFINE_STACK_OF(X509_ALGOR)
  29 DEFINE_STACK_OF(X509_ATTRIBUTE)
  30
  31 /* CMS SignedData Utilities */
  32
  33 static CMS_SignedData *cms_get0_signed(CMS_ContentInfo *cms)
  34 {
  35     if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed) {
  36         CMSerr(CMS_F_CMS_GET0_SIGNED, CMS_R_CONTENT_TYPE_NOT_SIGNED_DATA);
  37         return NULL;
  38     }
  39     return cms->d.signedData;
  40 }
  41
  42 static CMS_SignedData *cms_signed_data_init(CMS_ContentInfo *cms)
  43 {
  44     if (cms->d.other == NULL) {
  45         cms->d.signedData = M_ASN1_new_of(CMS_SignedData);
  46         if (!cms->d.signedData) {
  47             CMSerr(CMS_F_CMS_SIGNED_DATA_INIT, ERR_R_MALLOC_FAILURE);
  48             return NULL;
  49         }
  50         cms->d.signedData->version = 1;
  51         cms->d.signedData->encapContentInfo->eContentType =
  52             OBJ_nid2obj(NID_pkcs7_data);
  53         cms->d.signedData->encapContentInfo->partial = 1;
  54         ASN1_OBJECT_free(cms->contentType);
  55         cms->contentType = OBJ_nid2obj(NID_pkcs7_signed);
  56         return cms->d.signedData;
  57     }
  58     return cms_get0_signed(cms);
  59 }
  60
  61 /* Just initialise SignedData e.g. for certs only structure */
  62
  63 int CMS_SignedData_init(CMS_ContentInfo *cms)
  64 {
  65     if (cms_signed_data_init(cms))
  66         return 1;
  67     else
  68         return 0;
  69 }
  70
  71
  72 /* Check structures and fixup version numbers (if necessary) */
  73
  74 static void cms_sd_set_version(CMS_SignedData *sd)
  75 {
  76     int i;
  77     CMS_CertificateChoices *cch;
  78     CMS_RevocationInfoChoice *rch;
  79     CMS_SignerInfo *si;
  80
  81     for (i = 0; i < sk_CMS_CertificateChoices_num(sd->certificates); i++) {
  82         cch = sk_CMS_CertificateChoices_value(sd->certificates, i);
  83         if (cch->type == CMS_CERTCHOICE_OTHER) {
  84             if (sd->version < 5)
  85                 sd->version = 5;
  86         } else if (cch->type == CMS_CERTCHOICE_V2ACERT) {
  87             if (sd->version < 4)
  88                 sd->version = 4;
  89         } else if (cch->type == CMS_CERTCHOICE_V1ACERT) {
  90             if (sd->version < 3)
  91                 sd->version = 3;
  92         }
  93     }
  94
  95     for (i = 0; i < sk_CMS_RevocationInfoChoice_num(sd->crls); i++) {
  96         rch = sk_CMS_RevocationInfoChoice_value(sd->crls, i);
  97         if (rch->type == CMS_REVCHOICE_OTHER) {
  98             if (sd->version < 5)
  99                 sd->version = 5;
 100         }
 101     }
 102
 103     if ((OBJ_obj2nid(sd->encapContentInfo->eContentType) != NID_pkcs7_data)
 104         && (sd->version < 3))
 105         sd->version = 3;
 106
 107     for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
 108         si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
 109         if (si->sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
 110             if (si->version < 3)
 111                 si->version = 3;
 112             if (sd->version < 3)
 113                 sd->version = 3;
 114         } else if (si->version < 1)
 115             si->version = 1;
 116     }
 117
 118     if (sd->version < 1)
 119         sd->version = 1;
 120
 121 }
 122
 123 /*
 124  * RFC 5652 Section 11.1 Content Type
 125  * The content-type attribute within signed-data MUST
 126  *   1) be present if there are signed attributes
 127  *   2) match the content type in the signed-data,
 128  *   3) be a signed attribute.
 129  *   4) not have more than one copy of the attribute.
 130  *
 131  * Note that since the CMS_SignerInfo_sign() always adds the "signing time"
 132  * attribute, the content type attribute MUST be added also.
 133  * Assumptions: This assumes that the attribute does not already exist.
 134  */
 135 static int cms_set_si_contentType_attr(CMS_ContentInfo *cms, CMS_SignerInfo *si)
 136 {
 137     ASN1_OBJECT *ctype = cms->d.signedData->encapContentInfo->eContentType;
 138
 139     /* Add the contentType attribute */
 140     return CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
 141                                        V_ASN1_OBJECT, ctype, -1) > 0;
 142 }
 143
 144 /* Copy an existing messageDigest value */
 145
 146 static int cms_copy_messageDigest(CMS_ContentInfo *cms, CMS_SignerInfo *si)
 147 {
 148     STACK_OF(CMS_SignerInfo) *sinfos;
 149     CMS_SignerInfo *sitmp;
 150     int i;
 151
 152     sinfos = CMS_get0_SignerInfos(cms);
 153     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 154         ASN1_OCTET_STRING *messageDigest;
 155
 156         sitmp = sk_CMS_SignerInfo_value(sinfos, i);
 157         if (sitmp == si)
 158             continue;
 159         if (CMS_signed_get_attr_count(sitmp) < 0)
 160             continue;
 161         if (OBJ_cmp(si->digestAlgorithm->algorithm,
 162                     sitmp->digestAlgorithm->algorithm))
 163             continue;
 164         messageDigest = CMS_signed_get0_data_by_OBJ(sitmp,
 165                                                     OBJ_nid2obj
 166                                                     (NID_pkcs9_messageDigest),
 167                                                     -3, V_ASN1_OCTET_STRING);
 168         if (!messageDigest) {
 169             CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST,
 170                    CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 171             return 0;
 172         }
 173
 174         if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 175                                         V_ASN1_OCTET_STRING,
 176                                         messageDigest, -1))
 177             return 1;
 178         else
 179             return 0;
 180     }
 181     CMSerr(CMS_F_CMS_COPY_MESSAGEDIGEST, CMS_R_NO_MATCHING_DIGEST);
 182     return 0;
 183 }
 184
 185 int cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert, int type,
 186                               const CMS_CTX *ctx)
 187 {
 188     switch (type) {
 189     case CMS_SIGNERINFO_ISSUER_SERIAL:
 190         if (!cms_set1_ias(&sid->d.issuerAndSerialNumber, cert))
 191             return 0;
 192         break;
 193
 194     case CMS_SIGNERINFO_KEYIDENTIFIER:
 195         if (!cms_set1_keyid(&sid->d.subjectKeyIdentifier, cert))
 196             return 0;
 197         break;
 198
 199     default:
 200         CMSerr(CMS_F_CMS_SET1_SIGNERIDENTIFIER, CMS_R_UNKNOWN_ID);
 201         return 0;
 202     }
 203
 204     sid->type = type;
 205
 206     return 1;
 207 }
 208
 209 int cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier *sid,
 210                                         ASN1_OCTET_STRING **keyid,
 211                                         X509_NAME **issuer,
 212                                         ASN1_INTEGER **sno)
 213 {
 214     if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL) {
 215         if (issuer)
 216             *issuer = sid->d.issuerAndSerialNumber->issuer;
 217         if (sno)
 218             *sno = sid->d.issuerAndSerialNumber->serialNumber;
 219     } else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
 220         if (keyid)
 221             *keyid = sid->d.subjectKeyIdentifier;
 222     } else
 223         return 0;
 224     return 1;
 225 }
 226
 227 int cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert)
 228 {
 229     if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
 230         return cms_ias_cert_cmp(sid->d.issuerAndSerialNumber, cert);
 231     else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
 232         return cms_keyid_cert_cmp(sid->d.subjectKeyIdentifier, cert);
 233     else
 234         return -1;
 235 }
 236
 237 static int cms_sd_asn1_ctrl(CMS_SignerInfo *si, int cmd)
 238 {
 239     EVP_PKEY *pkey = si->pkey;
 240     int i;
 241
 242     if (pkey->ameth == NULL || pkey->ameth->pkey_ctrl == NULL)
 243         return 1;
 244     i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_SIGN, cmd, si);
 245     if (i == -2) {
 246         CMSerr(CMS_F_CMS_SD_ASN1_CTRL, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 247         return 0;
 248     }
 249     if (i <= 0) {
 250         CMSerr(CMS_F_CMS_SD_ASN1_CTRL, CMS_R_CTRL_FAILURE);
 251         return 0;
 252     }
 253     return 1;
 254 }
 255
 256 CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms,
 257                                 X509 *signer, EVP_PKEY *pk, const EVP_MD *md,
 258                                 unsigned int flags)
 259 {
 260     CMS_SignedData *sd;
 261     CMS_SignerInfo *si = NULL;
 262     X509_ALGOR *alg;
 263     int i, type;
 264     const CMS_CTX *ctx = cms_get0_cmsctx(cms);
 265
 266     if (!X509_check_private_key(signer, pk)) {
 267         CMSerr(CMS_F_CMS_ADD1_SIGNER,
 268                CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 269         return NULL;
 270     }
 271     sd = cms_signed_data_init(cms);
 272     if (!sd)
 273         goto err;
 274     si = M_ASN1_new_of(CMS_SignerInfo);
 275     if (!si)
 276         goto merr;
 277     /* Call for side-effect of computing hash and caching extensions */
 278     X509_check_purpose(signer, -1, -1);
 279
 280     X509_up_ref(signer);
 281     EVP_PKEY_up_ref(pk);
 282
 283     si->cms_ctx = ctx;
 284     si->pkey = pk;
 285     si->signer = signer;
 286     si->mctx = EVP_MD_CTX_new();
 287     si->pctx = NULL;
 288
 289     if (si->mctx == NULL) {
 290         CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
 291         goto err;
 292     }
 293
 294     if (flags & CMS_USE_KEYID) {
 295         si->version = 3;
 296         if (sd->version < 3)
 297             sd->version = 3;
 298         type = CMS_SIGNERINFO_KEYIDENTIFIER;
 299     } else {
 300         type = CMS_SIGNERINFO_ISSUER_SERIAL;
 301         si->version = 1;
 302     }
 303
 304     if (!cms_set1_SignerIdentifier(si->sid, signer, type, ctx))
 305         goto err;
 306
 307     if (md == NULL) {
 308         int def_nid;
 309         if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0)
 310             goto err;
 311         md = EVP_get_digestbynid(def_nid);
 312         if (md == NULL) {
 313             CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DEFAULT_DIGEST);
 314             goto err;
 315         }
 316     }
 317
 318     if (!md) {
 319         CMSerr(CMS_F_CMS_ADD1_SIGNER, CMS_R_NO_DIGEST_SET);
 320         goto err;
 321     }
 322
 323     if (md == NULL) {
 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         const 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          * Initialize signed attributes structure 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_CADES) {
 373             ESS_SIGNING_CERT *sc = NULL;
 374             ESS_SIGNING_CERT_V2 *sc2 = NULL;
 375             int add_sc;
 376
 377             if (md == EVP_sha1() || md == NULL) {
 378                 if ((sc = ESS_SIGNING_CERT_new_init(signer,
 379                                                     NULL, 1)) == NULL)
 380                     goto err;
 381                 add_sc = cms_add1_signing_cert(si, sc);
 382                 ESS_SIGNING_CERT_free(sc);
 383             } else {
 384                 if ((sc2 = ESS_SIGNING_CERT_V2_new_init(md, signer,
 385                                                         NULL, 1)) == NULL)
 386                     goto err;
 387                 add_sc = cms_add1_signing_cert_v2(si, sc2);
 388                 ESS_SIGNING_CERT_V2_free(sc2);
 389             }
 390             if (!add_sc)
 391                 goto err;
 392         }
 393         if (flags & CMS_REUSE_DIGEST) {
 394             if (!cms_copy_messageDigest(cms, si))
 395                 goto err;
 396             if (!cms_set_si_contentType_attr(cms, si))
 397                 goto err;
 398             if (!(flags & (CMS_PARTIAL | CMS_KEY_PARAM)) &&
 399                 !CMS_SignerInfo_sign(si))
 400                 goto err;
 401         }
 402     }
 403
 404     if (!(flags & CMS_NOCERTS)) {
 405         /* NB ignore -1 return for duplicate cert */
 406         if (!CMS_add1_cert(cms, signer))
 407             goto merr;
 408     }
 409
 410     if (flags & CMS_KEY_PARAM) {
 411         if (flags & CMS_NOATTR) {
 412             si->pctx = EVP_PKEY_CTX_new_from_pkey(ctx->libctx, si->pkey,
 413                                                   ctx->propq);
 414             if (si->pctx == NULL)
 415                 goto err;
 416             if (EVP_PKEY_sign_init(si->pctx) <= 0)
 417                 goto err;
 418             if (EVP_PKEY_CTX_set_signature_md(si->pctx, md) <= 0)
 419                 goto err;
 420         } else if (EVP_DigestSignInit_with_libctx(si->mctx, &si->pctx,
 421                                                   EVP_MD_name(md),
 422                                                   ctx->libctx, ctx->propq,
 423                                                   pk) <= 0) {
 424             goto err;
 425         }
 426     }
 427
 428     if (!sd->signerInfos)
 429         sd->signerInfos = sk_CMS_SignerInfo_new_null();
 430     if (!sd->signerInfos || !sk_CMS_SignerInfo_push(sd->signerInfos, si))
 431         goto merr;
 432
 433     return si;
 434
 435  merr:
 436     CMSerr(CMS_F_CMS_ADD1_SIGNER, ERR_R_MALLOC_FAILURE);
 437  err:
 438     M_ASN1_free_of(si, CMS_SignerInfo);
 439     return NULL;
 440
 441 }
 442
 443 void cms_SignerInfos_set_cmsctx(CMS_ContentInfo *cms)
 444 {
 445     int i;
 446     CMS_SignerInfo *si;
 447     STACK_OF(CMS_SignerInfo) *sinfos = CMS_get0_SignerInfos(cms);
 448     const CMS_CTX *ctx = cms_get0_cmsctx(cms);
 449
 450     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 451         si = sk_CMS_SignerInfo_value(sinfos, i);
 452         if (si != NULL)
 453             si->cms_ctx = ctx;
 454     }
 455 }
 456
 457 static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
 458 {
 459     ASN1_TIME *tt;
 460     int r = 0;
 461
 462     if (t != NULL)
 463         tt = t;
 464     else
 465         tt = X509_gmtime_adj(NULL, 0);
 466
 467     if (tt == NULL)
 468         goto merr;
 469
 470     if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
 471                                     tt->type, tt, -1) <= 0)
 472         goto merr;
 473
 474     r = 1;
 475  merr:
 476     if (t == NULL)
 477         ASN1_TIME_free(tt);
 478
 479     if (!r)
 480         CMSerr(CMS_F_CMS_ADD1_SIGNINGTIME, ERR_R_MALLOC_FAILURE);
 481
 482     return r;
 483
 484 }
 485
 486 EVP_PKEY_CTX *CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo *si)
 487 {
 488     return si->pctx;
 489 }
 490
 491 EVP_MD_CTX *CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo *si)
 492 {
 493     return si->mctx;
 494 }
 495
 496 STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
 497 {
 498     CMS_SignedData *sd = cms_get0_signed(cms);
 499
 500     return sd != NULL ? sd->signerInfos : NULL;
 501 }
 502
 503 STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms)
 504 {
 505     STACK_OF(X509) *signers = NULL;
 506     STACK_OF(CMS_SignerInfo) *sinfos;
 507     CMS_SignerInfo *si;
 508     int i;
 509
 510     sinfos = CMS_get0_SignerInfos(cms);
 511     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 512         si = sk_CMS_SignerInfo_value(sinfos, i);
 513         if (si->signer != NULL) {
 514             if (!X509_add_cert_new(&signers, si->signer,
 515                                    X509_ADD_FLAG_DEFAULT)) {
 516                 sk_X509_free(signers);
 517                 return NULL;
 518             }
 519         }
 520     }
 521     return signers;
 522 }
 523
 524 void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
 525 {
 526     if (signer != NULL) {
 527         X509_up_ref(signer);
 528         EVP_PKEY_free(si->pkey);
 529         si->pkey = X509_get_pubkey(signer);
 530     }
 531     X509_free(si->signer);
 532     si->signer = signer;
 533 }
 534
 535 int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si,
 536                                   ASN1_OCTET_STRING **keyid,
 537                                   X509_NAME **issuer, ASN1_INTEGER **sno)
 538 {
 539     return cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
 540 }
 541
 542 int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
 543 {
 544     return cms_SignerIdentifier_cert_cmp(si->sid, cert);
 545 }
 546
 547 int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
 548                            unsigned int flags)
 549 {
 550     CMS_SignedData *sd;
 551     CMS_SignerInfo *si;
 552     CMS_CertificateChoices *cch;
 553     STACK_OF(CMS_CertificateChoices) *certs;
 554     X509 *x;
 555     int i, j;
 556     int ret = 0;
 557
 558     sd = cms_get0_signed(cms);
 559     if (sd == NULL)
 560         return -1;
 561     certs = sd->certificates;
 562     for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
 563         si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
 564         if (si->signer != NULL)
 565             continue;
 566
 567         for (j = 0; j < sk_X509_num(scerts); j++) {
 568             x = sk_X509_value(scerts, j);
 569             if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
 570                 CMS_SignerInfo_set1_signer_cert(si, x);
 571                 ret++;
 572                 break;
 573             }
 574         }
 575
 576         if (si->signer != NULL || (flags & CMS_NOINTERN))
 577             continue;
 578
 579         for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++) {
 580             cch = sk_CMS_CertificateChoices_value(certs, j);
 581             if (cch->type != 0)
 582                 continue;
 583             x = cch->d.certificate;
 584             if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
 585                 CMS_SignerInfo_set1_signer_cert(si, x);
 586                 ret++;
 587                 break;
 588             }
 589         }
 590     }
 591     return ret;
 592 }
 593
 594 void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk,
 595                               X509 **signer, X509_ALGOR **pdig,
 596                               X509_ALGOR **psig)
 597 {
 598     if (pk != NULL)
 599         *pk = si->pkey;
 600     if (signer != NULL)
 601         *signer = si->signer;
 602     if (pdig != NULL)
 603         *pdig = si->digestAlgorithm;
 604     if (psig != NULL)
 605         *psig = si->signatureAlgorithm;
 606 }
 607
 608 ASN1_OCTET_STRING *CMS_SignerInfo_get0_signature(CMS_SignerInfo *si)
 609 {
 610     return si->signature;
 611 }
 612
 613 static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
 614                                        CMS_SignerInfo *si, BIO *chain)
 615 {
 616     EVP_MD_CTX *mctx = EVP_MD_CTX_new();
 617     int r = 0;
 618     EVP_PKEY_CTX *pctx = NULL;
 619     const CMS_CTX *ctx = cms_get0_cmsctx(cms);
 620
 621     if (mctx == NULL) {
 622         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE);
 623         return 0;
 624     }
 625
 626     if (si->pkey == NULL) {
 627         CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_NO_PRIVATE_KEY);
 628         goto err;
 629     }
 630
 631     if (!cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
 632         goto err;
 633     /* Set SignerInfo algorithm details if we used custom parameter */
 634     if (si->pctx && !cms_sd_asn1_ctrl(si, 0))
 635         goto err;
 636
 637     /*
 638      * If any signed attributes calculate and add messageDigest attribute
 639      */
 640
 641     if (CMS_signed_get_attr_count(si) >= 0) {
 642         unsigned char md[EVP_MAX_MD_SIZE];
 643         unsigned int mdlen;
 644
 645         if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
 646             goto err;
 647         if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 648                                          V_ASN1_OCTET_STRING, md, mdlen))
 649             goto err;
 650         /* Copy content type across */
 651         if (!cms_set_si_contentType_attr(cms, si))
 652             goto err;
 653
 654         if (!CMS_SignerInfo_sign(si))
 655             goto err;
 656     } else if (si->pctx) {
 657         unsigned char *sig;
 658         size_t siglen;
 659         unsigned char md[EVP_MAX_MD_SIZE];
 660         unsigned int mdlen;
 661
 662         pctx = si->pctx;
 663         if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
 664             goto err;
 665         siglen = EVP_PKEY_size(si->pkey);
 666         sig = OPENSSL_malloc(siglen);
 667         if (sig == NULL) {
 668             CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE);
 669             goto err;
 670         }
 671         if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0) {
 672             OPENSSL_free(sig);
 673             goto err;
 674         }
 675         ASN1_STRING_set0(si->signature, sig, siglen);
 676     } else {
 677         unsigned char *sig;
 678         unsigned int siglen;
 679
 680         sig = OPENSSL_malloc(EVP_PKEY_size(si->pkey));
 681         if (sig == NULL) {
 682             CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, ERR_R_MALLOC_FAILURE);
 683             goto err;
 684         }
 685         if (!EVP_SignFinal_with_libctx(mctx, sig, &siglen, si->pkey,
 686                                        ctx->libctx, ctx->propq)) {
 687             CMSerr(CMS_F_CMS_SIGNERINFO_CONTENT_SIGN, CMS_R_SIGNFINAL_ERROR);
 688             OPENSSL_free(sig);
 689             goto err;
 690         }
 691         ASN1_STRING_set0(si->signature, sig, siglen);
 692     }
 693
 694     r = 1;
 695
 696  err:
 697     EVP_MD_CTX_free(mctx);
 698     EVP_PKEY_CTX_free(pctx);
 699     return r;
 700
 701 }
 702
 703 int cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
 704 {
 705     STACK_OF(CMS_SignerInfo) *sinfos;
 706     CMS_SignerInfo *si;
 707     int i;
 708
 709     sinfos = CMS_get0_SignerInfos(cms);
 710     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 711         si = sk_CMS_SignerInfo_value(sinfos, i);
 712         if (!cms_SignerInfo_content_sign(cms, si, chain))
 713             return 0;
 714     }
 715     cms->d.signedData->encapContentInfo->partial = 0;
 716     return 1;
 717 }
 718
 719 int CMS_SignerInfo_sign(CMS_SignerInfo *si)
 720 {
 721     EVP_MD_CTX *mctx = si->mctx;
 722     EVP_PKEY_CTX *pctx = NULL;
 723     unsigned char *abuf = NULL;
 724     int alen;
 725     size_t siglen;
 726     const CMS_CTX *ctx = si->cms_ctx;
 727     const char *md_name = OBJ_nid2sn(OBJ_obj2nid(si->digestAlgorithm->algorithm));
 728
 729     if (md_name == NULL)
 730         return 0;
 731
 732     if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0) {
 733         if (!cms_add1_signingTime(si, NULL))
 734             goto err;
 735     }
 736
 737     if (!CMS_si_check_attributes(si))
 738         goto err;
 739
 740     if (si->pctx)
 741         pctx = si->pctx;
 742     else {
 743         EVP_MD_CTX_reset(mctx);
 744         if (EVP_DigestSignInit_with_libctx(mctx, &pctx,
 745                                            md_name, ctx->libctx, ctx->propq,
 746                                            si->pkey) <= 0)
 747             goto err;
 748         si->pctx = pctx;
 749     }
 750
 751     /*
 752      * TODO(3.0): This causes problems when providers are in use, so disabled
 753      * for now. Can we get rid of this completely? AFAICT this ctrl has been
 754      * present since CMS was first put in - but has never been used to do
 755      * anything. All internal implementations just return 1 and ignore this ctrl
 756      * and have always done so by the looks of things. To fix this we could
 757      * convert this ctrl into a param, which would require us to send all the
 758      * signer info data as a set of params...but that is non-trivial and since
 759      * this isn't used by anything it may be better just to remove it.
 760      */
 761 #if 0
 762     if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 763                           EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0) {
 764         CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 765         goto err;
 766     }
 767 #endif
 768
 769     alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
 770                          ASN1_ITEM_rptr(CMS_Attributes_Sign));
 771     if (!abuf)
 772         goto err;
 773     if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
 774         goto err;
 775     if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
 776         goto err;
 777     OPENSSL_free(abuf);
 778     abuf = OPENSSL_malloc(siglen);
 779     if (abuf == NULL)
 780         goto err;
 781     if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
 782         goto err;
 783
 784     /*
 785      * TODO(3.0): This causes problems when providers are in use, so disabled
 786      * for now. Can we get rid of this completely? AFAICT this ctrl has been
 787      * present since CMS was first put in - but has never been used to do
 788      * anything. All internal implementations just return 1 and ignore this ctrl
 789      * and have always done so by the looks of things. To fix this we could
 790      * convert this ctrl into a param, which would require us to send all the
 791      * signer info data as a set of params...but that is non-trivial and since
 792      * this isn't used by anything it may be better just to remove it.
 793      */
 794 #if 0
 795     if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 796                           EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0) {
 797         CMSerr(CMS_F_CMS_SIGNERINFO_SIGN, CMS_R_CTRL_ERROR);
 798         goto err;
 799     }
 800 #endif
 801
 802     EVP_MD_CTX_reset(mctx);
 803
 804     ASN1_STRING_set0(si->signature, abuf, siglen);
 805
 806     return 1;
 807
 808  err:
 809     OPENSSL_free(abuf);
 810     EVP_MD_CTX_reset(mctx);
 811     return 0;
 812 }
 813
 814 int CMS_SignerInfo_verify(CMS_SignerInfo *si)
 815 {
 816     EVP_MD_CTX *mctx = NULL;
 817     unsigned char *abuf = NULL;
 818     int alen, r = -1;
 819     const char *name;
 820     EVP_MD *md = NULL;
 821     const CMS_CTX *ctx = si->cms_ctx;
 822
 823     if (si->pkey == NULL) {
 824         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_NO_PUBLIC_KEY);
 825         return -1;
 826     }
 827
 828     if (!CMS_si_check_attributes(si))
 829         return -1;
 830
 831     name = OBJ_nid2sn(OBJ_obj2nid(si->digestAlgorithm->algorithm));
 832     md = EVP_MD_fetch(ctx->libctx, name, ctx->propq);
 833     if (md == NULL)
 834         return -1;
 835     if (si->mctx == NULL && (si->mctx = EVP_MD_CTX_new()) == NULL) {
 836         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, ERR_R_MALLOC_FAILURE);
 837         goto err;
 838     }
 839     mctx = si->mctx;
 840     if (EVP_DigestVerifyInit_with_libctx(mctx, &si->pctx,
 841                                          EVP_MD_name(md), ctx->libctx, NULL,
 842                                          si->pkey) <= 0)
 843         goto err;
 844
 845     if (!cms_sd_asn1_ctrl(si, 1))
 846         goto err;
 847
 848     alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
 849                          ASN1_ITEM_rptr(CMS_Attributes_Verify));
 850     if (!abuf)
 851         goto err;
 852     r = EVP_DigestVerifyUpdate(mctx, abuf, alen);
 853     OPENSSL_free(abuf);
 854     if (r <= 0) {
 855         r = -1;
 856         goto err;
 857     }
 858     r = EVP_DigestVerifyFinal(mctx,
 859                               si->signature->data, si->signature->length);
 860     if (r <= 0)
 861         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY, CMS_R_VERIFICATION_FAILURE);
 862  err:
 863     EVP_MD_free(md);
 864     EVP_MD_CTX_reset(mctx);
 865     return r;
 866 }
 867
 868 /* Create a chain of digest BIOs from a CMS ContentInfo */
 869
 870 BIO *cms_SignedData_init_bio(CMS_ContentInfo *cms)
 871 {
 872     int i;
 873     CMS_SignedData *sd;
 874     BIO *chain = NULL;
 875
 876     sd = cms_get0_signed(cms);
 877     if (sd == NULL)
 878         return NULL;
 879     if (cms->d.signedData->encapContentInfo->partial)
 880         cms_sd_set_version(sd);
 881     for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
 882         X509_ALGOR *digestAlgorithm;
 883         BIO *mdbio;
 884
 885         digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 886         mdbio = cms_DigestAlgorithm_init_bio(digestAlgorithm, cms_get0_cmsctx(cms));
 887         if (mdbio == NULL)
 888             goto err;
 889         if (chain != NULL)
 890             BIO_push(chain, mdbio);
 891         else
 892             chain = mdbio;
 893     }
 894     return chain;
 895  err:
 896     BIO_free_all(chain);
 897     return NULL;
 898 }
 899
 900 int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
 901 {
 902     ASN1_OCTET_STRING *os = NULL;
 903     EVP_MD_CTX *mctx = EVP_MD_CTX_new();
 904     EVP_PKEY_CTX *pkctx = NULL;
 905     int r = -1;
 906     unsigned char mval[EVP_MAX_MD_SIZE];
 907     unsigned int mlen;
 908
 909     if (mctx == NULL) {
 910         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT, ERR_R_MALLOC_FAILURE);
 911         goto err;
 912     }
 913     /* If we have any signed attributes look for messageDigest value */
 914     if (CMS_signed_get_attr_count(si) >= 0) {
 915         os = CMS_signed_get0_data_by_OBJ(si,
 916                                          OBJ_nid2obj(NID_pkcs9_messageDigest),
 917                                          -3, V_ASN1_OCTET_STRING);
 918         if (os == NULL) {
 919             CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 920                    CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 921             goto err;
 922         }
 923     }
 924
 925     if (!cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
 926         goto err;
 927
 928     if (EVP_DigestFinal_ex(mctx, mval, &mlen) <= 0) {
 929         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 930                CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
 931         goto err;
 932     }
 933
 934     /* If messageDigest found compare it */
 935
 936     if (os != NULL) {
 937         if (mlen != (unsigned int)os->length) {
 938             CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 939                    CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
 940             goto err;
 941         }
 942
 943         if (memcmp(mval, os->data, mlen)) {
 944             CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 945                    CMS_R_VERIFICATION_FAILURE);
 946             r = 0;
 947         } else
 948             r = 1;
 949     } else {
 950         const EVP_MD *md = EVP_MD_CTX_md(mctx);
 951         const CMS_CTX *ctx = si->cms_ctx;
 952
 953         pkctx = EVP_PKEY_CTX_new_from_pkey(ctx->libctx, si->pkey, ctx->propq);
 954         if (pkctx == NULL)
 955             goto err;
 956         if (EVP_PKEY_verify_init(pkctx) <= 0)
 957             goto err;
 958         if (EVP_PKEY_CTX_set_signature_md(pkctx, md) <= 0)
 959             goto err;
 960         si->pctx = pkctx;
 961         if (!cms_sd_asn1_ctrl(si, 1))
 962             goto err;
 963         r = EVP_PKEY_verify(pkctx, si->signature->data,
 964                             si->signature->length, mval, mlen);
 965         if (r <= 0) {
 966             CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CONTENT,
 967                    CMS_R_VERIFICATION_FAILURE);
 968             r = 0;
 969         }
 970     }
 971
 972  err:
 973     EVP_PKEY_CTX_free(pkctx);
 974     EVP_MD_CTX_free(mctx);
 975     return r;
 976
 977 }
 978
 979 int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
 980 {
 981     unsigned char *smder = NULL;
 982     int smderlen, r;
 983
 984     smderlen = i2d_X509_ALGORS(algs, &smder);
 985     if (smderlen <= 0)
 986         return 0;
 987     r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
 988                                     V_ASN1_SEQUENCE, smder, smderlen);
 989     OPENSSL_free(smder);
 990     return r;
 991 }
 992
 993 int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
 994                             int algnid, int keysize)
 995 {
 996     X509_ALGOR *alg;
 997     ASN1_INTEGER *key = NULL;
 998
 999     if (keysize > 0) {
1000         key = ASN1_INTEGER_new();
1001         if (key == NULL || !ASN1_INTEGER_set(key, keysize)) {
1002             ASN1_INTEGER_free(key);
1003             return 0;
1004         }
1005     }
1006     alg = X509_ALGOR_new();
1007     if (alg == NULL) {
1008         ASN1_INTEGER_free(key);
1009         return 0;
1010     }
1011
1012     X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
1013                     key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key);
1014     if (*algs == NULL)
1015         *algs = sk_X509_ALGOR_new_null();
1016     if (*algs == NULL || !sk_X509_ALGOR_push(*algs, alg)) {
1017         X509_ALGOR_free(alg);
1018         return 0;
1019     }
1020     return 1;
1021 }
1022
1023 /* Check to see if a cipher exists and if so add S/MIME capabilities */
1024
1025 static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1026 {
1027     if (EVP_get_cipherbynid(nid))
1028         return CMS_add_simple_smimecap(sk, nid, arg);
1029     return 1;
1030 }
1031
1032 static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1033 {
1034     if (EVP_get_digestbynid(nid))
1035         return CMS_add_simple_smimecap(sk, nid, arg);
1036     return 1;
1037 }
1038
1039 int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
1040 {
1041     if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
1042         || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
1043         || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
1044         || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
1045         || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
1046         || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
1047         || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
1048         || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
1049         || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
1050         || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
1051         || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
1052         || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
1053         return 0;
1054     return 1;
1055 }