crypto/openssl/crypto/cms/cms_lib.c

   1 /* crypto/cms/cms_lib.c */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  */
  53
  54 #include <openssl/asn1t.h>
  55 #include <openssl/x509.h>
  56 #include <openssl/err.h>
  57 #include <openssl/pem.h>
  58 #include <openssl/bio.h>
  59 #include <openssl/asn1.h>
  60 #include "cms.h"
  61 #include "cms_lcl.h"
  62
  63 IMPLEMENT_ASN1_FUNCTIONS(CMS_ContentInfo)
  64 IMPLEMENT_ASN1_PRINT_FUNCTION(CMS_ContentInfo)
  65
  66 DECLARE_ASN1_ITEM(CMS_CertificateChoices)
  67 DECLARE_ASN1_ITEM(CMS_RevocationInfoChoice)
  68 DECLARE_STACK_OF(CMS_CertificateChoices)
  69 DECLARE_STACK_OF(CMS_RevocationInfoChoice)
  70
  71 const ASN1_OBJECT *CMS_get0_type(CMS_ContentInfo *cms)
  72         {
  73         return cms->contentType;
  74         }
  75
  76 CMS_ContentInfo *cms_Data_create(void)
  77         {
  78         CMS_ContentInfo *cms;
  79         cms = CMS_ContentInfo_new();
  80         if (cms)
  81                 {
  82                 cms->contentType = OBJ_nid2obj(NID_pkcs7_data);
  83                 /* Never detached */
  84                 CMS_set_detached(cms, 0);
  85                 }
  86         return cms;
  87         }
  88
  89 BIO *cms_content_bio(CMS_ContentInfo *cms)
  90         {
  91         ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
  92         if (!pos)
  93                 return NULL;
  94         /* If content detached data goes nowhere: create NULL BIO */
  95         if (!*pos)
  96                 return BIO_new(BIO_s_null());
  97         /* If content not detached and created return memory BIO
  98          */
  99         if (!*pos || ((*pos)->flags == ASN1_STRING_FLAG_CONT))
 100                 return BIO_new(BIO_s_mem());
 101         /* Else content was read in: return read only BIO for it */
 102         return BIO_new_mem_buf((*pos)->data, (*pos)->length);
 103         }
 104
 105 BIO *CMS_dataInit(CMS_ContentInfo *cms, BIO *icont)
 106         {
 107         BIO *cmsbio, *cont;
 108         if (icont)
 109                 cont = icont;
 110         else
 111                 cont = cms_content_bio(cms);
 112         if (!cont)
 113                 {
 114                 CMSerr(CMS_F_CMS_DATAINIT, CMS_R_NO_CONTENT);
 115                 return NULL;
 116                 }
 117         switch (OBJ_obj2nid(cms->contentType))
 118                 {
 119
 120                 case NID_pkcs7_data:
 121                 return cont;
 122
 123                 case NID_pkcs7_signed:
 124                 cmsbio = cms_SignedData_init_bio(cms);
 125                 break;
 126
 127                 case NID_pkcs7_digest:
 128                 cmsbio = cms_DigestedData_init_bio(cms);
 129                 break;
 130 #ifdef ZLIB
 131                 case NID_id_smime_ct_compressedData:
 132                 cmsbio = cms_CompressedData_init_bio(cms);
 133                 break;
 134 #endif
 135
 136                 case NID_pkcs7_encrypted:
 137                 cmsbio = cms_EncryptedData_init_bio(cms);
 138                 break;
 139
 140                 case NID_pkcs7_enveloped:
 141                 cmsbio = cms_EnvelopedData_init_bio(cms);
 142                 break;
 143
 144                 default:
 145                 CMSerr(CMS_F_CMS_DATAINIT, CMS_R_UNSUPPORTED_TYPE);
 146                 return NULL;
 147                 }
 148
 149         if (cmsbio)
 150                 return BIO_push(cmsbio, cont);
 151
 152         if (!icont)
 153                 BIO_free(cont);
 154         return NULL;
 155
 156         }
 157
 158 int CMS_dataFinal(CMS_ContentInfo *cms, BIO *cmsbio)
 159         {
 160         ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
 161         if (!pos)
 162                 return 0;
 163         /* If ebmedded content find memory BIO and set content */
 164         if (*pos && ((*pos)->flags & ASN1_STRING_FLAG_CONT))
 165                 {
 166                 BIO *mbio;
 167                 unsigned char *cont;
 168                 long contlen;
 169                 mbio = BIO_find_type(cmsbio, BIO_TYPE_MEM);
 170                 if (!mbio)
 171                         {
 172                         CMSerr(CMS_F_CMS_DATAFINAL, CMS_R_CONTENT_NOT_FOUND);
 173                         return 0;
 174                         }
 175                 contlen = BIO_get_mem_data(mbio, &cont);
 176                 /* Set bio as read only so its content can't be clobbered */
 177                 BIO_set_flags(mbio, BIO_FLAGS_MEM_RDONLY);
 178                 BIO_set_mem_eof_return(mbio, 0);
 179                 ASN1_STRING_set0(*pos, cont, contlen);
 180                 (*pos)->flags &= ~ASN1_STRING_FLAG_CONT;
 181                 }
 182
 183         switch (OBJ_obj2nid(cms->contentType))
 184                 {
 185
 186                 case NID_pkcs7_data:
 187                 case NID_pkcs7_enveloped:
 188                 case NID_pkcs7_encrypted:
 189                 case NID_id_smime_ct_compressedData:
 190                 /* Nothing to do */
 191                 return 1;
 192
 193                 case NID_pkcs7_signed:
 194                 return cms_SignedData_final(cms, cmsbio);
 195
 196                 case NID_pkcs7_digest:
 197                 return cms_DigestedData_do_final(cms, cmsbio, 0);
 198
 199                 default:
 200                 CMSerr(CMS_F_CMS_DATAFINAL, CMS_R_UNSUPPORTED_TYPE);
 201                 return 0;
 202                 }
 203         }
 204
 205 /* Return an OCTET STRING pointer to content. This allows it to
 206  * be accessed or set later.
 207  */
 208
 209 ASN1_OCTET_STRING **CMS_get0_content(CMS_ContentInfo *cms)
 210         {
 211         switch (OBJ_obj2nid(cms->contentType))
 212                 {
 213
 214                 case NID_pkcs7_data:
 215                 return &cms->d.data;
 216
 217                 case NID_pkcs7_signed:
 218                 return &cms->d.signedData->encapContentInfo->eContent;
 219
 220                 case NID_pkcs7_enveloped:
 221                 return &cms->d.envelopedData->encryptedContentInfo->encryptedContent;
 222
 223                 case NID_pkcs7_digest:
 224                 return &cms->d.digestedData->encapContentInfo->eContent;
 225
 226                 case NID_pkcs7_encrypted:
 227                 return &cms->d.encryptedData->encryptedContentInfo->encryptedContent;
 228
 229                 case NID_id_smime_ct_authData:
 230                 return &cms->d.authenticatedData->encapContentInfo->eContent;
 231
 232                 case NID_id_smime_ct_compressedData:
 233                 return &cms->d.compressedData->encapContentInfo->eContent;
 234
 235                 default:
 236                 if (cms->d.other->type == V_ASN1_OCTET_STRING)
 237                         return &cms->d.other->value.octet_string;
 238                 CMSerr(CMS_F_CMS_GET0_CONTENT, CMS_R_UNSUPPORTED_CONTENT_TYPE);
 239                 return NULL;
 240
 241                 }
 242         }
 243
 244 /* Return an ASN1_OBJECT pointer to content type. This allows it to
 245  * be accessed or set later.
 246  */
 247
 248 static ASN1_OBJECT **cms_get0_econtent_type(CMS_ContentInfo *cms)
 249         {
 250         switch (OBJ_obj2nid(cms->contentType))
 251                 {
 252
 253                 case NID_pkcs7_signed:
 254                 return &cms->d.signedData->encapContentInfo->eContentType;
 255
 256                 case NID_pkcs7_enveloped:
 257                 return &cms->d.envelopedData->encryptedContentInfo->contentType;
 258
 259                 case NID_pkcs7_digest:
 260                 return &cms->d.digestedData->encapContentInfo->eContentType;
 261
 262                 case NID_pkcs7_encrypted:
 263                 return &cms->d.encryptedData->encryptedContentInfo->contentType;
 264
 265                 case NID_id_smime_ct_authData:
 266                 return &cms->d.authenticatedData->encapContentInfo->eContentType;
 267
 268                 case NID_id_smime_ct_compressedData:
 269                 return &cms->d.compressedData->encapContentInfo->eContentType;
 270
 271                 default:
 272                 CMSerr(CMS_F_CMS_GET0_ECONTENT_TYPE,
 273                                         CMS_R_UNSUPPORTED_CONTENT_TYPE);
 274                 return NULL;
 275
 276                 }
 277         }
 278
 279 const ASN1_OBJECT *CMS_get0_eContentType(CMS_ContentInfo *cms)
 280         {
 281         ASN1_OBJECT **petype;
 282         petype = cms_get0_econtent_type(cms);
 283         if (petype)
 284                 return *petype;
 285         return NULL;
 286         }
 287
 288 int CMS_set1_eContentType(CMS_ContentInfo *cms, const ASN1_OBJECT *oid)
 289         {
 290         ASN1_OBJECT **petype, *etype;
 291         petype = cms_get0_econtent_type(cms);
 292         if (!petype)
 293                 return 0;
 294         if (!oid)
 295                 return 1;
 296         etype = OBJ_dup(oid);
 297         if (!etype)
 298                 return 0;
 299         ASN1_OBJECT_free(*petype);
 300         *petype = etype;
 301         return 1;
 302         }
 303
 304 int CMS_is_detached(CMS_ContentInfo *cms)
 305         {
 306         ASN1_OCTET_STRING **pos;
 307         pos = CMS_get0_content(cms);
 308         if (!pos)
 309                 return -1;
 310         if (*pos)
 311                 return 0;
 312         return 1;
 313         }
 314
 315 int CMS_set_detached(CMS_ContentInfo *cms, int detached)
 316         {
 317         ASN1_OCTET_STRING **pos;
 318         pos = CMS_get0_content(cms);
 319         if (!pos)
 320                 return 0;
 321         if (detached)
 322                 {
 323                 if (*pos)
 324                         {
 325                         ASN1_OCTET_STRING_free(*pos);
 326                         *pos = NULL;
 327                         }
 328                 return 1;
 329                 }
 330         if (!*pos)
 331                 *pos = ASN1_OCTET_STRING_new();
 332         if (*pos)
 333                 {
 334                 /* NB: special flag to show content is created and not
 335                  * read in.
 336                  */
 337                 (*pos)->flags |= ASN1_STRING_FLAG_CONT;
 338                 return 1;
 339                 }
 340         CMSerr(CMS_F_CMS_SET_DETACHED, ERR_R_MALLOC_FAILURE);
 341         return 0;
 342         }
 343
 344 /* Set up an X509_ALGOR DigestAlgorithmIdentifier from an EVP_MD */
 345
 346 void cms_DigestAlgorithm_set(X509_ALGOR *alg, const EVP_MD *md)
 347         {
 348         int param_type;
 349
 350         if (md->flags & EVP_MD_FLAG_DIGALGID_ABSENT)
 351                 param_type = V_ASN1_UNDEF;
 352         else
 353                 param_type = V_ASN1_NULL;
 354
 355         X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_MD_type(md)), param_type, NULL);
 356
 357         }
 358
 359 /* Create a digest BIO from an X509_ALGOR structure */
 360
 361 BIO *cms_DigestAlgorithm_init_bio(X509_ALGOR *digestAlgorithm)
 362         {
 363         BIO *mdbio = NULL;
 364         ASN1_OBJECT *digestoid;
 365         const EVP_MD *digest;
 366         X509_ALGOR_get0(&digestoid, NULL, NULL, digestAlgorithm);
 367         digest = EVP_get_digestbyobj(digestoid);
 368         if (!digest)
 369                 {
 370                 CMSerr(CMS_F_CMS_DIGESTALGORITHM_INIT_BIO,
 371                                 CMS_R_UNKNOWN_DIGEST_ALGORIHM);
 372                 goto err;
 373                 }
 374         mdbio = BIO_new(BIO_f_md());
 375         if (!mdbio || !BIO_set_md(mdbio, digest))
 376                 {
 377                 CMSerr(CMS_F_CMS_DIGESTALGORITHM_INIT_BIO,
 378                                 CMS_R_MD_BIO_INIT_ERROR);
 379                 goto err;
 380                 }
 381         return mdbio;
 382         err:
 383         if (mdbio)
 384                 BIO_free(mdbio);
 385         return NULL;
 386         }
 387
 388 /* Locate a message digest content from a BIO chain based on SignerInfo */
 389
 390 int cms_DigestAlgorithm_find_ctx(EVP_MD_CTX *mctx, BIO *chain,
 391                                         X509_ALGOR *mdalg)
 392         {
 393         int nid;
 394         ASN1_OBJECT *mdoid;
 395         X509_ALGOR_get0(&mdoid, NULL, NULL, mdalg);
 396         nid = OBJ_obj2nid(mdoid);
 397         /* Look for digest type to match signature */
 398         for (;;)
 399                 {
 400                 EVP_MD_CTX *mtmp;
 401                 chain = BIO_find_type(chain, BIO_TYPE_MD);
 402                 if (chain == NULL)
 403                         {
 404                         CMSerr(CMS_F_CMS_DIGESTALGORITHM_FIND_CTX,
 405                                                 CMS_R_NO_MATCHING_DIGEST);
 406                         return 0;
 407                         }
 408                 BIO_get_md_ctx(chain, &mtmp);
 409                 if (EVP_MD_CTX_type(mtmp) == nid
 410                 /* Workaround for broken implementations that use signature
 411                  * algorithm  OID instead of digest.
 412                  */
 413                         || EVP_MD_pkey_type(EVP_MD_CTX_md(mtmp)) == nid)
 414                         {
 415                         return EVP_MD_CTX_copy_ex(mctx, mtmp);
 416                         }
 417                 chain = BIO_next(chain);
 418                 }
 419         }
 420
 421 static STACK_OF(CMS_CertificateChoices) **cms_get0_certificate_choices(CMS_ContentInfo *cms)
 422         {
 423         switch (OBJ_obj2nid(cms->contentType))
 424                 {
 425
 426                 case NID_pkcs7_signed:
 427                 return &cms->d.signedData->certificates;
 428
 429                 case NID_pkcs7_enveloped:
 430                 return &cms->d.envelopedData->originatorInfo->certificates;
 431
 432                 default:
 433                 CMSerr(CMS_F_CMS_GET0_CERTIFICATE_CHOICES,
 434                                         CMS_R_UNSUPPORTED_CONTENT_TYPE);
 435                 return NULL;
 436
 437                 }
 438         }
 439
 440 CMS_CertificateChoices *CMS_add0_CertificateChoices(CMS_ContentInfo *cms)
 441         {
 442         STACK_OF(CMS_CertificateChoices) **pcerts;
 443         CMS_CertificateChoices *cch;
 444         pcerts = cms_get0_certificate_choices(cms);
 445         if (!pcerts)
 446                 return NULL;
 447         if (!*pcerts)
 448                 *pcerts = sk_CMS_CertificateChoices_new_null();
 449         if (!*pcerts)
 450                 return NULL;
 451         cch = M_ASN1_new_of(CMS_CertificateChoices);
 452         if (!cch)
 453                 return NULL;
 454         if (!sk_CMS_CertificateChoices_push(*pcerts, cch))
 455                 {
 456                 M_ASN1_free_of(cch, CMS_CertificateChoices);
 457                 return NULL;
 458                 }
 459         return cch;
 460         }
 461
 462 int CMS_add0_cert(CMS_ContentInfo *cms, X509 *cert)
 463         {
 464         CMS_CertificateChoices *cch;
 465         STACK_OF(CMS_CertificateChoices) **pcerts;
 466         int i;
 467         pcerts = cms_get0_certificate_choices(cms);
 468         if (!pcerts)
 469                 return 0;
 470         if (!pcerts)
 471                 return 0;
 472         for (i = 0; i < sk_CMS_CertificateChoices_num(*pcerts); i++)
 473                 {
 474                 cch = sk_CMS_CertificateChoices_value(*pcerts, i);
 475                 if (cch->type == CMS_CERTCHOICE_CERT)
 476                         {
 477                         if (!X509_cmp(cch->d.certificate, cert))
 478                                 {
 479                                 CMSerr(CMS_F_CMS_ADD0_CERT,
 480                                         CMS_R_CERTIFICATE_ALREADY_PRESENT);
 481                                 return 0;
 482                                 }
 483                         }
 484                 }
 485         cch = CMS_add0_CertificateChoices(cms);
 486         if (!cch)
 487                 return 0;
 488         cch->type = CMS_CERTCHOICE_CERT;
 489         cch->d.certificate = cert;
 490         return 1;
 491         }
 492
 493 int CMS_add1_cert(CMS_ContentInfo *cms, X509 *cert)
 494         {
 495         int r;
 496         r = CMS_add0_cert(cms, cert);
 497         if (r > 0)
 498                 CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509);
 499         return r;
 500         }
 501
 502 static STACK_OF(CMS_RevocationInfoChoice) **cms_get0_revocation_choices(CMS_ContentInfo *cms)
 503         {
 504         switch (OBJ_obj2nid(cms->contentType))
 505                 {
 506
 507                 case NID_pkcs7_signed:
 508                 return &cms->d.signedData->crls;
 509
 510                 case NID_pkcs7_enveloped:
 511                 return &cms->d.envelopedData->originatorInfo->crls;
 512
 513                 default:
 514                 CMSerr(CMS_F_CMS_GET0_REVOCATION_CHOICES,
 515                                         CMS_R_UNSUPPORTED_CONTENT_TYPE);
 516                 return NULL;
 517
 518                 }
 519         }
 520
 521 CMS_RevocationInfoChoice *CMS_add0_RevocationInfoChoice(CMS_ContentInfo *cms)
 522         {
 523         STACK_OF(CMS_RevocationInfoChoice) **pcrls;
 524         CMS_RevocationInfoChoice *rch;
 525         pcrls = cms_get0_revocation_choices(cms);
 526         if (!pcrls)
 527                 return NULL;
 528         if (!*pcrls)
 529                 *pcrls = sk_CMS_RevocationInfoChoice_new_null();
 530         if (!*pcrls)
 531                 return NULL;
 532         rch = M_ASN1_new_of(CMS_RevocationInfoChoice);
 533         if (!rch)
 534                 return NULL;
 535         if (!sk_CMS_RevocationInfoChoice_push(*pcrls, rch))
 536                 {
 537                 M_ASN1_free_of(rch, CMS_RevocationInfoChoice);
 538                 return NULL;
 539                 }
 540         return rch;
 541         }
 542
 543 int CMS_add0_crl(CMS_ContentInfo *cms, X509_CRL *crl)
 544         {
 545         CMS_RevocationInfoChoice *rch;
 546         rch = CMS_add0_RevocationInfoChoice(cms);
 547         if (!rch)
 548                 return 0;
 549         rch->type = CMS_REVCHOICE_CRL;
 550         rch->d.crl = crl;
 551         return 1;
 552         }
 553
 554 int CMS_add1_crl(CMS_ContentInfo *cms, X509_CRL *crl)
 555         {
 556         int r;
 557         r = CMS_add0_crl(cms, crl);
 558         if (r > 0)
 559                 CRYPTO_add(&crl->references, 1, CRYPTO_LOCK_X509_CRL);
 560         return r;
 561         }
 562
 563 STACK_OF(X509) *CMS_get1_certs(CMS_ContentInfo *cms)
 564         {
 565         STACK_OF(X509) *certs = NULL;
 566         CMS_CertificateChoices *cch;
 567         STACK_OF(CMS_CertificateChoices) **pcerts;
 568         int i;
 569         pcerts = cms_get0_certificate_choices(cms);
 570         if (!pcerts)
 571                 return NULL;
 572         for (i = 0; i < sk_CMS_CertificateChoices_num(*pcerts); i++)
 573                 {
 574                 cch = sk_CMS_CertificateChoices_value(*pcerts, i);
 575                 if (cch->type == 0)
 576                         {
 577                         if (!certs)
 578                                 {
 579                                 certs = sk_X509_new_null();
 580                                 if (!certs)
 581                                         return NULL;
 582                                 }
 583                         if (!sk_X509_push(certs, cch->d.certificate))
 584                                 {
 585                                 sk_X509_pop_free(certs, X509_free);
 586                                 return NULL;
 587                                 }
 588                         CRYPTO_add(&cch->d.certificate->references,
 589                                                 1, CRYPTO_LOCK_X509);
 590                         }
 591                 }
 592         return certs;
 593
 594         }
 595
 596 STACK_OF(X509_CRL) *CMS_get1_crls(CMS_ContentInfo *cms)
 597         {
 598         STACK_OF(X509_CRL) *crls = NULL;
 599         STACK_OF(CMS_RevocationInfoChoice) **pcrls;
 600         CMS_RevocationInfoChoice *rch;
 601         int i;
 602         pcrls = cms_get0_revocation_choices(cms);
 603         if (!pcrls)
 604                 return NULL;
 605         for (i = 0; i < sk_CMS_RevocationInfoChoice_num(*pcrls); i++)
 606                 {
 607                 rch = sk_CMS_RevocationInfoChoice_value(*pcrls, i);
 608                 if (rch->type == 0)
 609                         {
 610                         if (!crls)
 611                                 {
 612                                 crls = sk_X509_CRL_new_null();
 613                                 if (!crls)
 614                                         return NULL;
 615                                 }
 616                         if (!sk_X509_CRL_push(crls, rch->d.crl))
 617                                 {
 618                                 sk_X509_CRL_pop_free(crls, X509_CRL_free);
 619                                 return NULL;
 620                                 }
 621                         CRYPTO_add(&rch->d.crl->references,
 622                                                 1, CRYPTO_LOCK_X509_CRL);
 623                         }
 624                 }
 625         return crls;
 626         }