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 /* CMS SignedData Utilities */
  26
  27 static CMS_SignedData *cms_get0_signed(CMS_ContentInfo *cms)
  28 {
  29     if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed) {
  30         ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_TYPE_NOT_SIGNED_DATA);
  31         return NULL;
  32     }
  33     return cms->d.signedData;
  34 }
  35
  36 static CMS_SignedData *cms_signed_data_init(CMS_ContentInfo *cms)
  37 {
  38     if (cms->d.other == NULL) {
  39         cms->d.signedData = M_ASN1_new_of(CMS_SignedData);
  40         if (!cms->d.signedData) {
  41             ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
  42             return NULL;
  43         }
  44         cms->d.signedData->version = 1;
  45         cms->d.signedData->encapContentInfo->eContentType =
  46             OBJ_nid2obj(NID_pkcs7_data);
  47         cms->d.signedData->encapContentInfo->partial = 1;
  48         ASN1_OBJECT_free(cms->contentType);
  49         cms->contentType = OBJ_nid2obj(NID_pkcs7_signed);
  50         return cms->d.signedData;
  51     }
  52     return cms_get0_signed(cms);
  53 }
  54
  55 /* Just initialise SignedData e.g. for certs only structure */
  56
  57 int CMS_SignedData_init(CMS_ContentInfo *cms)
  58 {
  59     if (cms_signed_data_init(cms))
  60         return 1;
  61     else
  62         return 0;
  63 }
  64
  65
  66 /* Check structures and fixup version numbers (if necessary) */
  67
  68 static void cms_sd_set_version(CMS_SignedData *sd)
  69 {
  70     int i;
  71     CMS_CertificateChoices *cch;
  72     CMS_RevocationInfoChoice *rch;
  73     CMS_SignerInfo *si;
  74
  75     for (i = 0; i < sk_CMS_CertificateChoices_num(sd->certificates); i++) {
  76         cch = sk_CMS_CertificateChoices_value(sd->certificates, i);
  77         if (cch->type == CMS_CERTCHOICE_OTHER) {
  78             if (sd->version < 5)
  79                 sd->version = 5;
  80         } else if (cch->type == CMS_CERTCHOICE_V2ACERT) {
  81             if (sd->version < 4)
  82                 sd->version = 4;
  83         } else if (cch->type == CMS_CERTCHOICE_V1ACERT) {
  84             if (sd->version < 3)
  85                 sd->version = 3;
  86         }
  87     }
  88
  89     for (i = 0; i < sk_CMS_RevocationInfoChoice_num(sd->crls); i++) {
  90         rch = sk_CMS_RevocationInfoChoice_value(sd->crls, i);
  91         if (rch->type == CMS_REVCHOICE_OTHER) {
  92             if (sd->version < 5)
  93                 sd->version = 5;
  94         }
  95     }
  96
  97     if ((OBJ_obj2nid(sd->encapContentInfo->eContentType) != NID_pkcs7_data)
  98         && (sd->version < 3))
  99         sd->version = 3;
 100
 101     for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
 102         si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
 103         if (si->sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
 104             if (si->version < 3)
 105                 si->version = 3;
 106             if (sd->version < 3)
 107                 sd->version = 3;
 108         } else if (si->version < 1)
 109             si->version = 1;
 110     }
 111
 112     if (sd->version < 1)
 113         sd->version = 1;
 114
 115 }
 116
 117 /*
 118  * RFC 5652 Section 11.1 Content Type
 119  * The content-type attribute within signed-data MUST
 120  *   1) be present if there are signed attributes
 121  *   2) match the content type in the signed-data,
 122  *   3) be a signed attribute.
 123  *   4) not have more than one copy of the attribute.
 124  *
 125  * Note that since the CMS_SignerInfo_sign() always adds the "signing time"
 126  * attribute, the content type attribute MUST be added also.
 127  * Assumptions: This assumes that the attribute does not already exist.
 128  */
 129 static int cms_set_si_contentType_attr(CMS_ContentInfo *cms, CMS_SignerInfo *si)
 130 {
 131     ASN1_OBJECT *ctype = cms->d.signedData->encapContentInfo->eContentType;
 132
 133     /* Add the contentType attribute */
 134     return CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
 135                                        V_ASN1_OBJECT, ctype, -1) > 0;
 136 }
 137
 138 /* Copy an existing messageDigest value */
 139
 140 static int cms_copy_messageDigest(CMS_ContentInfo *cms, CMS_SignerInfo *si)
 141 {
 142     STACK_OF(CMS_SignerInfo) *sinfos;
 143     CMS_SignerInfo *sitmp;
 144     int i;
 145
 146     sinfos = CMS_get0_SignerInfos(cms);
 147     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 148         ASN1_OCTET_STRING *messageDigest;
 149
 150         sitmp = sk_CMS_SignerInfo_value(sinfos, i);
 151         if (sitmp == si)
 152             continue;
 153         if (CMS_signed_get_attr_count(sitmp) < 0)
 154             continue;
 155         if (OBJ_cmp(si->digestAlgorithm->algorithm,
 156                     sitmp->digestAlgorithm->algorithm))
 157             continue;
 158         messageDigest = CMS_signed_get0_data_by_OBJ(sitmp,
 159                                                     OBJ_nid2obj
 160                                                     (NID_pkcs9_messageDigest),
 161                                                     -3, V_ASN1_OCTET_STRING);
 162         if (!messageDigest) {
 163             ERR_raise(ERR_LIB_CMS, CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 164             return 0;
 165         }
 166
 167         if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 168                                         V_ASN1_OCTET_STRING,
 169                                         messageDigest, -1))
 170             return 1;
 171         else
 172             return 0;
 173     }
 174     ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_DIGEST);
 175     return 0;
 176 }
 177
 178 int cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert, int type,
 179                               const CMS_CTX *ctx)
 180 {
 181     switch (type) {
 182     case CMS_SIGNERINFO_ISSUER_SERIAL:
 183         if (!cms_set1_ias(&sid->d.issuerAndSerialNumber, cert))
 184             return 0;
 185         break;
 186
 187     case CMS_SIGNERINFO_KEYIDENTIFIER:
 188         if (!cms_set1_keyid(&sid->d.subjectKeyIdentifier, cert))
 189             return 0;
 190         break;
 191
 192     default:
 193         ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_ID);
 194         return 0;
 195     }
 196
 197     sid->type = type;
 198
 199     return 1;
 200 }
 201
 202 int cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier *sid,
 203                                         ASN1_OCTET_STRING **keyid,
 204                                         X509_NAME **issuer,
 205                                         ASN1_INTEGER **sno)
 206 {
 207     if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL) {
 208         if (issuer)
 209             *issuer = sid->d.issuerAndSerialNumber->issuer;
 210         if (sno)
 211             *sno = sid->d.issuerAndSerialNumber->serialNumber;
 212     } else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
 213         if (keyid)
 214             *keyid = sid->d.subjectKeyIdentifier;
 215     } else
 216         return 0;
 217     return 1;
 218 }
 219
 220 int cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert)
 221 {
 222     if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
 223         return cms_ias_cert_cmp(sid->d.issuerAndSerialNumber, cert);
 224     else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
 225         return cms_keyid_cert_cmp(sid->d.subjectKeyIdentifier, cert);
 226     else
 227         return -1;
 228 }
 229
 230 static int cms_sd_asn1_ctrl(CMS_SignerInfo *si, int cmd)
 231 {
 232     EVP_PKEY *pkey = si->pkey;
 233     int i;
 234
 235 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_EC)
 236     if (EVP_PKEY_is_a(pkey, "DSA") || EVP_PKEY_is_a(pkey, "EC"))
 237         return cms_ecdsa_dsa_sign(si, cmd);
 238     else
 239 #endif
 240     if (EVP_PKEY_is_a(pkey, "RSA") || EVP_PKEY_is_a(pkey, "RSA-PSS"))
 241         return cms_rsa_sign(si, cmd);
 242
 243     /* Something else? We'll give engines etc a chance to handle this */
 244     if (pkey->ameth == NULL || pkey->ameth->pkey_ctrl == NULL)
 245         return 1;
 246     i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_SIGN, cmd, si);
 247     if (i == -2) {
 248         ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 249         return 0;
 250     }
 251     if (i <= 0) {
 252         ERR_raise(ERR_LIB_CMS, CMS_R_CTRL_FAILURE);
 253         return 0;
 254     }
 255     return 1;
 256 }
 257
 258 CMS_SignerInfo *CMS_add1_signer(CMS_ContentInfo *cms,
 259                                 X509 *signer, EVP_PKEY *pk, const EVP_MD *md,
 260                                 unsigned int flags)
 261 {
 262     CMS_SignedData *sd;
 263     CMS_SignerInfo *si = NULL;
 264     X509_ALGOR *alg;
 265     int i, type;
 266     const CMS_CTX *ctx = cms_get0_cmsctx(cms);
 267
 268     if (!X509_check_private_key(signer, pk)) {
 269         ERR_raise(ERR_LIB_CMS, CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 270         return NULL;
 271     }
 272     sd = cms_signed_data_init(cms);
 273     if (!sd)
 274         goto err;
 275     si = M_ASN1_new_of(CMS_SignerInfo);
 276     if (!si)
 277         goto merr;
 278     /* Call for side-effect of computing hash and caching extensions */
 279     X509_check_purpose(signer, -1, -1);
 280
 281     X509_up_ref(signer);
 282     EVP_PKEY_up_ref(pk);
 283
 284     si->cms_ctx = ctx;
 285     si->pkey = pk;
 286     si->signer = signer;
 287     si->mctx = EVP_MD_CTX_new();
 288     si->pctx = NULL;
 289
 290     if (si->mctx == NULL) {
 291         ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 292         goto err;
 293     }
 294
 295     if (flags & CMS_USE_KEYID) {
 296         si->version = 3;
 297         if (sd->version < 3)
 298             sd->version = 3;
 299         type = CMS_SIGNERINFO_KEYIDENTIFIER;
 300     } else {
 301         type = CMS_SIGNERINFO_ISSUER_SERIAL;
 302         si->version = 1;
 303     }
 304
 305     if (!cms_set1_SignerIdentifier(si->sid, signer, type, ctx))
 306         goto err;
 307
 308     if (md == NULL) {
 309         int def_nid;
 310         if (EVP_PKEY_get_default_digest_nid(pk, &def_nid) <= 0)
 311             goto err;
 312         md = EVP_get_digestbynid(def_nid);
 313         if (md == NULL) {
 314             ERR_raise(ERR_LIB_CMS, CMS_R_NO_DEFAULT_DIGEST);
 315             goto err;
 316         }
 317     }
 318
 319     if (!md) {
 320         ERR_raise(ERR_LIB_CMS, CMS_R_NO_DIGEST_SET);
 321         goto err;
 322     }
 323
 324     if (md == NULL) {
 325         ERR_raise(ERR_LIB_CMS, CMS_R_NO_DIGEST_SET);
 326         goto err;
 327     }
 328
 329     X509_ALGOR_set_md(si->digestAlgorithm, md);
 330
 331     /* See if digest is present in digestAlgorithms */
 332     for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
 333         const ASN1_OBJECT *aoid;
 334         alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 335         X509_ALGOR_get0(&aoid, NULL, NULL, alg);
 336         if (OBJ_obj2nid(aoid) == EVP_MD_type(md))
 337             break;
 338     }
 339
 340     if (i == sk_X509_ALGOR_num(sd->digestAlgorithms)) {
 341         alg = X509_ALGOR_new();
 342         if (alg == NULL)
 343             goto merr;
 344         X509_ALGOR_set_md(alg, md);
 345         if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg)) {
 346             X509_ALGOR_free(alg);
 347             goto merr;
 348         }
 349     }
 350
 351     if (!(flags & CMS_KEY_PARAM) && !cms_sd_asn1_ctrl(si, 0))
 352         goto err;
 353     if (!(flags & CMS_NOATTR)) {
 354         /*
 355          * Initialize signed attributes structure so other attributes
 356          * such as signing time etc are added later even if we add none here.
 357          */
 358         if (!si->signedAttrs) {
 359             si->signedAttrs = sk_X509_ATTRIBUTE_new_null();
 360             if (!si->signedAttrs)
 361                 goto merr;
 362         }
 363
 364         if (!(flags & CMS_NOSMIMECAP)) {
 365             STACK_OF(X509_ALGOR) *smcap = NULL;
 366             i = CMS_add_standard_smimecap(&smcap);
 367             if (i)
 368                 i = CMS_add_smimecap(si, smcap);
 369             sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 370             if (!i)
 371                 goto merr;
 372         }
 373         if (flags & CMS_CADES) {
 374             ESS_SIGNING_CERT *sc = NULL;
 375             ESS_SIGNING_CERT_V2 *sc2 = NULL;
 376             int add_sc;
 377
 378             if (md == EVP_sha1() || md == NULL) {
 379                 if ((sc = ESS_SIGNING_CERT_new_init(signer,
 380                                                     NULL, 1)) == NULL)
 381                     goto err;
 382                 add_sc = cms_add1_signing_cert(si, sc);
 383                 ESS_SIGNING_CERT_free(sc);
 384             } else {
 385                 if ((sc2 = ESS_SIGNING_CERT_V2_new_init(md, signer,
 386                                                         NULL, 1)) == NULL)
 387                     goto err;
 388                 add_sc = cms_add1_signing_cert_v2(si, sc2);
 389                 ESS_SIGNING_CERT_V2_free(sc2);
 390             }
 391             if (!add_sc)
 392                 goto err;
 393         }
 394         if (flags & CMS_REUSE_DIGEST) {
 395             if (!cms_copy_messageDigest(cms, si))
 396                 goto err;
 397             if (!cms_set_si_contentType_attr(cms, si))
 398                 goto err;
 399             if (!(flags & (CMS_PARTIAL | CMS_KEY_PARAM)) &&
 400                 !CMS_SignerInfo_sign(si))
 401                 goto err;
 402         }
 403     }
 404
 405     if (!(flags & CMS_NOCERTS)) {
 406         /* NB ignore -1 return for duplicate cert */
 407         if (!CMS_add1_cert(cms, signer))
 408             goto merr;
 409     }
 410
 411     if (flags & CMS_KEY_PARAM) {
 412         if (flags & CMS_NOATTR) {
 413             si->pctx = EVP_PKEY_CTX_new_from_pkey(ctx->libctx, si->pkey,
 414                                                   ctx->propq);
 415             if (si->pctx == NULL)
 416                 goto err;
 417             if (EVP_PKEY_sign_init(si->pctx) <= 0)
 418                 goto err;
 419             if (EVP_PKEY_CTX_set_signature_md(si->pctx, md) <= 0)
 420                 goto err;
 421         } else if (EVP_DigestSignInit_ex(si->mctx, &si->pctx, EVP_MD_name(md),
 422                                          ctx->libctx, ctx->propq, pk) <= 0) {
 423             goto err;
 424         }
 425     }
 426
 427     if (!sd->signerInfos)
 428         sd->signerInfos = sk_CMS_SignerInfo_new_null();
 429     if (!sd->signerInfos || !sk_CMS_SignerInfo_push(sd->signerInfos, si))
 430         goto merr;
 431
 432     return si;
 433
 434  merr:
 435     ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 436  err:
 437     M_ASN1_free_of(si, CMS_SignerInfo);
 438     return NULL;
 439
 440 }
 441
 442 void cms_SignerInfos_set_cmsctx(CMS_ContentInfo *cms)
 443 {
 444     int i;
 445     CMS_SignerInfo *si;
 446     STACK_OF(CMS_SignerInfo) *sinfos = CMS_get0_SignerInfos(cms);
 447     const CMS_CTX *ctx = cms_get0_cmsctx(cms);
 448
 449     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 450         si = sk_CMS_SignerInfo_value(sinfos, i);
 451         if (si != NULL)
 452             si->cms_ctx = ctx;
 453     }
 454 }
 455
 456 static int cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
 457 {
 458     ASN1_TIME *tt;
 459     int r = 0;
 460
 461     if (t != NULL)
 462         tt = t;
 463     else
 464         tt = X509_gmtime_adj(NULL, 0);
 465
 466     if (tt == NULL)
 467         goto merr;
 468
 469     if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
 470                                     tt->type, tt, -1) <= 0)
 471         goto merr;
 472
 473     r = 1;
 474  merr:
 475     if (t == NULL)
 476         ASN1_TIME_free(tt);
 477
 478     if (!r)
 479         ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 480
 481     return r;
 482
 483 }
 484
 485 EVP_PKEY_CTX *CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo *si)
 486 {
 487     return si->pctx;
 488 }
 489
 490 EVP_MD_CTX *CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo *si)
 491 {
 492     return si->mctx;
 493 }
 494
 495 STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms)
 496 {
 497     CMS_SignedData *sd = cms_get0_signed(cms);
 498
 499     return sd != NULL ? sd->signerInfos : NULL;
 500 }
 501
 502 STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms)
 503 {
 504     STACK_OF(X509) *signers = NULL;
 505     STACK_OF(CMS_SignerInfo) *sinfos;
 506     CMS_SignerInfo *si;
 507     int i;
 508
 509     sinfos = CMS_get0_SignerInfos(cms);
 510     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 511         si = sk_CMS_SignerInfo_value(sinfos, i);
 512         if (si->signer != NULL) {
 513             if (!X509_add_cert_new(&signers, si->signer,
 514                                    X509_ADD_FLAG_DEFAULT)) {
 515                 sk_X509_free(signers);
 516                 return NULL;
 517             }
 518         }
 519     }
 520     return signers;
 521 }
 522
 523 void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
 524 {
 525     if (signer != NULL) {
 526         X509_up_ref(signer);
 527         EVP_PKEY_free(si->pkey);
 528         si->pkey = X509_get_pubkey(signer);
 529     }
 530     X509_free(si->signer);
 531     si->signer = signer;
 532 }
 533
 534 int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si,
 535                                   ASN1_OCTET_STRING **keyid,
 536                                   X509_NAME **issuer, ASN1_INTEGER **sno)
 537 {
 538     return cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
 539 }
 540
 541 int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
 542 {
 543     return cms_SignerIdentifier_cert_cmp(si->sid, cert);
 544 }
 545
 546 int CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
 547                            unsigned int flags)
 548 {
 549     CMS_SignedData *sd;
 550     CMS_SignerInfo *si;
 551     CMS_CertificateChoices *cch;
 552     STACK_OF(CMS_CertificateChoices) *certs;
 553     X509 *x;
 554     int i, j;
 555     int ret = 0;
 556
 557     sd = cms_get0_signed(cms);
 558     if (sd == NULL)
 559         return -1;
 560     certs = sd->certificates;
 561     for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
 562         si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
 563         if (si->signer != NULL)
 564             continue;
 565
 566         for (j = 0; j < sk_X509_num(scerts); j++) {
 567             x = sk_X509_value(scerts, j);
 568             if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
 569                 CMS_SignerInfo_set1_signer_cert(si, x);
 570                 ret++;
 571                 break;
 572             }
 573         }
 574
 575         if (si->signer != NULL || (flags & CMS_NOINTERN))
 576             continue;
 577
 578         for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++) {
 579             cch = sk_CMS_CertificateChoices_value(certs, j);
 580             if (cch->type != 0)
 581                 continue;
 582             x = cch->d.certificate;
 583             if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
 584                 CMS_SignerInfo_set1_signer_cert(si, x);
 585                 ret++;
 586                 break;
 587             }
 588         }
 589     }
 590     return ret;
 591 }
 592
 593 void CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk,
 594                               X509 **signer, X509_ALGOR **pdig,
 595                               X509_ALGOR **psig)
 596 {
 597     if (pk != NULL)
 598         *pk = si->pkey;
 599     if (signer != NULL)
 600         *signer = si->signer;
 601     if (pdig != NULL)
 602         *pdig = si->digestAlgorithm;
 603     if (psig != NULL)
 604         *psig = si->signatureAlgorithm;
 605 }
 606
 607 ASN1_OCTET_STRING *CMS_SignerInfo_get0_signature(CMS_SignerInfo *si)
 608 {
 609     return si->signature;
 610 }
 611
 612 static int cms_SignerInfo_content_sign(CMS_ContentInfo *cms,
 613                                        CMS_SignerInfo *si, BIO *chain)
 614 {
 615     EVP_MD_CTX *mctx = EVP_MD_CTX_new();
 616     int r = 0;
 617     EVP_PKEY_CTX *pctx = NULL;
 618     const CMS_CTX *ctx = cms_get0_cmsctx(cms);
 619
 620     if (mctx == NULL) {
 621         ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 622         return 0;
 623     }
 624
 625     if (si->pkey == NULL) {
 626         ERR_raise(ERR_LIB_CMS, CMS_R_NO_PRIVATE_KEY);
 627         goto err;
 628     }
 629
 630     if (!cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
 631         goto err;
 632     /* Set SignerInfo algorithm details if we used custom parameter */
 633     if (si->pctx && !cms_sd_asn1_ctrl(si, 0))
 634         goto err;
 635
 636     /*
 637      * If any signed attributes calculate and add messageDigest attribute
 638      */
 639
 640     if (CMS_signed_get_attr_count(si) >= 0) {
 641         unsigned char md[EVP_MAX_MD_SIZE];
 642         unsigned int mdlen;
 643
 644         if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
 645             goto err;
 646         if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
 647                                          V_ASN1_OCTET_STRING, md, mdlen))
 648             goto err;
 649         /* Copy content type across */
 650         if (!cms_set_si_contentType_attr(cms, si))
 651             goto err;
 652
 653         if (!CMS_SignerInfo_sign(si))
 654             goto err;
 655     } else if (si->pctx) {
 656         unsigned char *sig;
 657         size_t siglen;
 658         unsigned char md[EVP_MAX_MD_SIZE];
 659         unsigned int mdlen;
 660
 661         pctx = si->pctx;
 662         if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
 663             goto err;
 664         siglen = EVP_PKEY_size(si->pkey);
 665         sig = OPENSSL_malloc(siglen);
 666         if (sig == NULL) {
 667             ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 668             goto err;
 669         }
 670         if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0) {
 671             OPENSSL_free(sig);
 672             goto err;
 673         }
 674         ASN1_STRING_set0(si->signature, sig, siglen);
 675     } else {
 676         unsigned char *sig;
 677         unsigned int siglen;
 678
 679         sig = OPENSSL_malloc(EVP_PKEY_size(si->pkey));
 680         if (sig == NULL) {
 681             ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 682             goto err;
 683         }
 684         if (!EVP_SignFinal_ex(mctx, sig, &siglen, si->pkey, ctx->libctx,
 685                               ctx->propq)) {
 686             ERR_raise(ERR_LIB_CMS, CMS_R_SIGNFINAL_ERROR);
 687             OPENSSL_free(sig);
 688             goto err;
 689         }
 690         ASN1_STRING_set0(si->signature, sig, siglen);
 691     }
 692
 693     r = 1;
 694
 695  err:
 696     EVP_MD_CTX_free(mctx);
 697     EVP_PKEY_CTX_free(pctx);
 698     return r;
 699
 700 }
 701
 702 int cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
 703 {
 704     STACK_OF(CMS_SignerInfo) *sinfos;
 705     CMS_SignerInfo *si;
 706     int i;
 707
 708     sinfos = CMS_get0_SignerInfos(cms);
 709     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 710         si = sk_CMS_SignerInfo_value(sinfos, i);
 711         if (!cms_SignerInfo_content_sign(cms, si, chain))
 712             return 0;
 713     }
 714     cms->d.signedData->encapContentInfo->partial = 0;
 715     return 1;
 716 }
 717
 718 int CMS_SignerInfo_sign(CMS_SignerInfo *si)
 719 {
 720     EVP_MD_CTX *mctx = si->mctx;
 721     EVP_PKEY_CTX *pctx = NULL;
 722     unsigned char *abuf = NULL;
 723     int alen;
 724     size_t siglen;
 725     const CMS_CTX *ctx = si->cms_ctx;
 726     const char *md_name = OBJ_nid2sn(OBJ_obj2nid(si->digestAlgorithm->algorithm));
 727
 728     if (md_name == NULL)
 729         return 0;
 730
 731     if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0) {
 732         if (!cms_add1_signingTime(si, NULL))
 733             goto err;
 734     }
 735
 736     if (!CMS_si_check_attributes(si))
 737         goto err;
 738
 739     if (si->pctx)
 740         pctx = si->pctx;
 741     else {
 742         EVP_MD_CTX_reset(mctx);
 743         if (EVP_DigestSignInit_ex(mctx, &pctx, md_name, ctx->libctx, ctx->propq,
 744                                   si->pkey) <= 0)
 745             goto err;
 746         si->pctx = pctx;
 747     }
 748
 749     /*
 750      * TODO(3.0): This causes problems when providers are in use, so disabled
 751      * for now. Can we get rid of this completely? AFAICT this ctrl has been
 752      * present since CMS was first put in - but has never been used to do
 753      * anything. All internal implementations just return 1 and ignore this ctrl
 754      * and have always done so by the looks of things. To fix this we could
 755      * convert this ctrl into a param, which would require us to send all the
 756      * signer info data as a set of params...but that is non-trivial and since
 757      * this isn't used by anything it may be better just to remove it.
 758      */
 759 #if 0
 760     if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 761                           EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0) {
 762         ERR_raise(ERR_LIB_CMS, CMS_R_CTRL_ERROR);
 763         goto err;
 764     }
 765 #endif
 766
 767     alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
 768                          ASN1_ITEM_rptr(CMS_Attributes_Sign));
 769     if (!abuf)
 770         goto err;
 771     if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
 772         goto err;
 773     if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
 774         goto err;
 775     OPENSSL_free(abuf);
 776     abuf = OPENSSL_malloc(siglen);
 777     if (abuf == NULL)
 778         goto err;
 779     if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
 780         goto err;
 781
 782     /*
 783      * TODO(3.0): This causes problems when providers are in use, so disabled
 784      * for now. Can we get rid of this completely? AFAICT this ctrl has been
 785      * present since CMS was first put in - but has never been used to do
 786      * anything. All internal implementations just return 1 and ignore this ctrl
 787      * and have always done so by the looks of things. To fix this we could
 788      * convert this ctrl into a param, which would require us to send all the
 789      * signer info data as a set of params...but that is non-trivial and since
 790      * this isn't used by anything it may be better just to remove it.
 791      */
 792 #if 0
 793     if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
 794                           EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0) {
 795         ERR_raise(ERR_LIB_CMS, CMS_R_CTRL_ERROR);
 796         goto err;
 797     }
 798 #endif
 799
 800     EVP_MD_CTX_reset(mctx);
 801
 802     ASN1_STRING_set0(si->signature, abuf, siglen);
 803
 804     return 1;
 805
 806  err:
 807     OPENSSL_free(abuf);
 808     EVP_MD_CTX_reset(mctx);
 809     return 0;
 810 }
 811
 812 int CMS_SignerInfo_verify(CMS_SignerInfo *si)
 813 {
 814     EVP_MD_CTX *mctx = NULL;
 815     unsigned char *abuf = NULL;
 816     int alen, r = -1;
 817     const char *name;
 818     const EVP_MD *md;
 819     EVP_MD *fetched_md = NULL;
 820     const CMS_CTX *ctx = si->cms_ctx;
 821
 822     if (si->pkey == NULL) {
 823         ERR_raise(ERR_LIB_CMS, CMS_R_NO_PUBLIC_KEY);
 824         return -1;
 825     }
 826
 827     if (!CMS_si_check_attributes(si))
 828         return -1;
 829
 830     name = OBJ_nid2sn(OBJ_obj2nid(si->digestAlgorithm->algorithm));
 831
 832     (void)ERR_set_mark();
 833     fetched_md = EVP_MD_fetch(ctx->libctx, name, ctx->propq);
 834
 835     if (fetched_md != NULL)
 836         md = fetched_md;
 837     else
 838         md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 839     if (md == NULL) {
 840         (void)ERR_clear_last_mark();
 841         ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_DIGEST_ALGORITHM);
 842         return -1;
 843     }
 844     (void)ERR_pop_to_mark();
 845
 846     if (si->mctx == NULL && (si->mctx = EVP_MD_CTX_new()) == NULL) {
 847         ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 848         goto err;
 849     }
 850     mctx = si->mctx;
 851     if (EVP_DigestVerifyInit_ex(mctx, &si->pctx, EVP_MD_name(md), ctx->libctx,
 852                                 NULL, si->pkey) <= 0)
 853         goto err;
 854
 855     if (!cms_sd_asn1_ctrl(si, 1))
 856         goto err;
 857
 858     alen = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &abuf,
 859                          ASN1_ITEM_rptr(CMS_Attributes_Verify));
 860     if (abuf == NULL || alen < 0)
 861         goto err;
 862     r = EVP_DigestVerifyUpdate(mctx, abuf, alen);
 863     OPENSSL_free(abuf);
 864     if (r <= 0) {
 865         r = -1;
 866         goto err;
 867     }
 868     r = EVP_DigestVerifyFinal(mctx,
 869                               si->signature->data, si->signature->length);
 870     if (r <= 0)
 871         ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
 872  err:
 873     EVP_MD_free(fetched_md);
 874     EVP_MD_CTX_reset(mctx);
 875     return r;
 876 }
 877
 878 /* Create a chain of digest BIOs from a CMS ContentInfo */
 879
 880 BIO *cms_SignedData_init_bio(CMS_ContentInfo *cms)
 881 {
 882     int i;
 883     CMS_SignedData *sd;
 884     BIO *chain = NULL;
 885
 886     sd = cms_get0_signed(cms);
 887     if (sd == NULL)
 888         return NULL;
 889     if (cms->d.signedData->encapContentInfo->partial)
 890         cms_sd_set_version(sd);
 891     for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
 892         X509_ALGOR *digestAlgorithm;
 893         BIO *mdbio;
 894
 895         digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
 896         mdbio = cms_DigestAlgorithm_init_bio(digestAlgorithm, cms_get0_cmsctx(cms));
 897         if (mdbio == NULL)
 898             goto err;
 899         if (chain != NULL)
 900             BIO_push(chain, mdbio);
 901         else
 902             chain = mdbio;
 903     }
 904     return chain;
 905  err:
 906     BIO_free_all(chain);
 907     return NULL;
 908 }
 909
 910 int CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
 911 {
 912     ASN1_OCTET_STRING *os = NULL;
 913     EVP_MD_CTX *mctx = EVP_MD_CTX_new();
 914     EVP_PKEY_CTX *pkctx = NULL;
 915     int r = -1;
 916     unsigned char mval[EVP_MAX_MD_SIZE];
 917     unsigned int mlen;
 918
 919     if (mctx == NULL) {
 920         ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 921         goto err;
 922     }
 923     /* If we have any signed attributes look for messageDigest value */
 924     if (CMS_signed_get_attr_count(si) >= 0) {
 925         os = CMS_signed_get0_data_by_OBJ(si,
 926                                          OBJ_nid2obj(NID_pkcs9_messageDigest),
 927                                          -3, V_ASN1_OCTET_STRING);
 928         if (os == NULL) {
 929             ERR_raise(ERR_LIB_CMS, CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
 930             goto err;
 931         }
 932     }
 933
 934     if (!cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
 935         goto err;
 936
 937     if (EVP_DigestFinal_ex(mctx, mval, &mlen) <= 0) {
 938         ERR_raise(ERR_LIB_CMS, CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
 939         goto err;
 940     }
 941
 942     /* If messageDigest found compare it */
 943
 944     if (os != NULL) {
 945         if (mlen != (unsigned int)os->length) {
 946             ERR_raise(ERR_LIB_CMS, CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
 947             goto err;
 948         }
 949
 950         if (memcmp(mval, os->data, mlen)) {
 951             ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
 952             r = 0;
 953         } else
 954             r = 1;
 955     } else {
 956         const EVP_MD *md = EVP_MD_CTX_md(mctx);
 957         const CMS_CTX *ctx = si->cms_ctx;
 958
 959         pkctx = EVP_PKEY_CTX_new_from_pkey(ctx->libctx, si->pkey, ctx->propq);
 960         if (pkctx == NULL)
 961             goto err;
 962         if (EVP_PKEY_verify_init(pkctx) <= 0)
 963             goto err;
 964         if (EVP_PKEY_CTX_set_signature_md(pkctx, md) <= 0)
 965             goto err;
 966         si->pctx = pkctx;
 967         if (!cms_sd_asn1_ctrl(si, 1))
 968             goto err;
 969         r = EVP_PKEY_verify(pkctx, si->signature->data,
 970                             si->signature->length, mval, mlen);
 971         if (r <= 0) {
 972             ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
 973             r = 0;
 974         }
 975     }
 976
 977  err:
 978     EVP_PKEY_CTX_free(pkctx);
 979     EVP_MD_CTX_free(mctx);
 980     return r;
 981
 982 }
 983
 984 int CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
 985 {
 986     unsigned char *smder = NULL;
 987     int smderlen, r;
 988
 989     smderlen = i2d_X509_ALGORS(algs, &smder);
 990     if (smderlen <= 0)
 991         return 0;
 992     r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
 993                                     V_ASN1_SEQUENCE, smder, smderlen);
 994     OPENSSL_free(smder);
 995     return r;
 996 }
 997
 998 int CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **algs,
 999                             int algnid, int keysize)
1000 {
1001     X509_ALGOR *alg;
1002     ASN1_INTEGER *key = NULL;
1003
1004     if (keysize > 0) {
1005         key = ASN1_INTEGER_new();
1006         if (key == NULL || !ASN1_INTEGER_set(key, keysize)) {
1007             ASN1_INTEGER_free(key);
1008             return 0;
1009         }
1010     }
1011     alg = X509_ALGOR_new();
1012     if (alg == NULL) {
1013         ASN1_INTEGER_free(key);
1014         return 0;
1015     }
1016
1017     X509_ALGOR_set0(alg, OBJ_nid2obj(algnid),
1018                     key ? V_ASN1_INTEGER : V_ASN1_UNDEF, key);
1019     if (*algs == NULL)
1020         *algs = sk_X509_ALGOR_new_null();
1021     if (*algs == NULL || !sk_X509_ALGOR_push(*algs, alg)) {
1022         X509_ALGOR_free(alg);
1023         return 0;
1024     }
1025     return 1;
1026 }
1027
1028 /* Check to see if a cipher exists and if so add S/MIME capabilities */
1029
1030 static int cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1031 {
1032     if (EVP_get_cipherbynid(nid))
1033         return CMS_add_simple_smimecap(sk, nid, arg);
1034     return 1;
1035 }
1036
1037 static int cms_add_digest_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
1038 {
1039     if (EVP_get_digestbynid(nid))
1040         return CMS_add_simple_smimecap(sk, nid, arg);
1041     return 1;
1042 }
1043
1044 int CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
1045 {
1046     if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
1047         || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
1048         || !cms_add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
1049         || !cms_add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
1050         || !cms_add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
1051         || !cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
1052         || !cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
1053         || !cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
1054         || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128)
1055         || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64)
1056         || !cms_add_cipher_smcap(smcap, NID_des_cbc, -1)
1057         || !cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
1058         return 0;
1059     return 1;
1060 }