crypto/cms/cms_smime.c

   1 /*
   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 "internal/cryptlib.h"
  55 #include <openssl/asn1t.h>
  56 #include <openssl/x509.h>
  57 #include <openssl/x509v3.h>
  58 #include <openssl/err.h>
  59 #include <openssl/cms.h>
  60 #include "cms_lcl.h"
  61 #include "internal/asn1_int.h"
  62
  63 static BIO *cms_get_text_bio(BIO *out, unsigned int flags)
  64 {
  65     BIO *rbio;
  66     if (out == NULL)
  67         rbio = BIO_new(BIO_s_null());
  68     else if (flags & CMS_TEXT) {
  69         rbio = BIO_new(BIO_s_mem());
  70         BIO_set_mem_eof_return(rbio, 0);
  71     } else
  72         rbio = out;
  73     return rbio;
  74 }
  75
  76 static int cms_copy_content(BIO *out, BIO *in, unsigned int flags)
  77 {
  78     unsigned char buf[4096];
  79     int r = 0, i;
  80     BIO *tmpout;
  81
  82     tmpout = cms_get_text_bio(out, flags);
  83
  84     if (tmpout == NULL) {
  85         CMSerr(CMS_F_CMS_COPY_CONTENT, ERR_R_MALLOC_FAILURE);
  86         goto err;
  87     }
  88
  89     /* Read all content through chain to process digest, decrypt etc */
  90     for (;;) {
  91         i = BIO_read(in, buf, sizeof(buf));
  92         if (i <= 0) {
  93             if (BIO_method_type(in) == BIO_TYPE_CIPHER) {
  94                 if (!BIO_get_cipher_status(in))
  95                     goto err;
  96             }
  97             if (i < 0)
  98                 goto err;
  99             break;
 100         }
 101
 102         if (tmpout && (BIO_write(tmpout, buf, i) != i))
 103             goto err;
 104     }
 105
 106     if (flags & CMS_TEXT) {
 107         if (!SMIME_text(tmpout, out)) {
 108             CMSerr(CMS_F_CMS_COPY_CONTENT, CMS_R_SMIME_TEXT_ERROR);
 109             goto err;
 110         }
 111     }
 112
 113     r = 1;
 114
 115  err:
 116     if (tmpout != out)
 117         BIO_free(tmpout);
 118     return r;
 119
 120 }
 121
 122 static int check_content(CMS_ContentInfo *cms)
 123 {
 124     ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
 125     if (!pos || !*pos) {
 126         CMSerr(CMS_F_CHECK_CONTENT, CMS_R_NO_CONTENT);
 127         return 0;
 128     }
 129     return 1;
 130 }
 131
 132 static void do_free_upto(BIO *f, BIO *upto)
 133 {
 134     if (upto) {
 135         BIO *tbio;
 136         do {
 137             tbio = BIO_pop(f);
 138             BIO_free(f);
 139             f = tbio;
 140         }
 141         while (f && f != upto);
 142     } else
 143         BIO_free_all(f);
 144 }
 145
 146 int CMS_data(CMS_ContentInfo *cms, BIO *out, unsigned int flags)
 147 {
 148     BIO *cont;
 149     int r;
 150     if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_data) {
 151         CMSerr(CMS_F_CMS_DATA, CMS_R_TYPE_NOT_DATA);
 152         return 0;
 153     }
 154     cont = CMS_dataInit(cms, NULL);
 155     if (!cont)
 156         return 0;
 157     r = cms_copy_content(out, cont, flags);
 158     BIO_free_all(cont);
 159     return r;
 160 }
 161
 162 CMS_ContentInfo *CMS_data_create(BIO *in, unsigned int flags)
 163 {
 164     CMS_ContentInfo *cms;
 165     cms = cms_Data_create();
 166     if (!cms)
 167         return NULL;
 168
 169     if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
 170         return cms;
 171
 172     CMS_ContentInfo_free(cms);
 173
 174     return NULL;
 175 }
 176
 177 int CMS_digest_verify(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 178                       unsigned int flags)
 179 {
 180     BIO *cont;
 181     int r;
 182     if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_digest) {
 183         CMSerr(CMS_F_CMS_DIGEST_VERIFY, CMS_R_TYPE_NOT_DIGESTED_DATA);
 184         return 0;
 185     }
 186
 187     if (!dcont && !check_content(cms))
 188         return 0;
 189
 190     cont = CMS_dataInit(cms, dcont);
 191     if (!cont)
 192         return 0;
 193     r = cms_copy_content(out, cont, flags);
 194     if (r)
 195         r = cms_DigestedData_do_final(cms, cont, 1);
 196     do_free_upto(cont, dcont);
 197     return r;
 198 }
 199
 200 CMS_ContentInfo *CMS_digest_create(BIO *in, const EVP_MD *md,
 201                                    unsigned int flags)
 202 {
 203     CMS_ContentInfo *cms;
 204     if (!md)
 205         md = EVP_sha1();
 206     cms = cms_DigestedData_create(md);
 207     if (!cms)
 208         return NULL;
 209
 210     if (!(flags & CMS_DETACHED))
 211         CMS_set_detached(cms, 0);
 212
 213     if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
 214         return cms;
 215
 216     CMS_ContentInfo_free(cms);
 217     return NULL;
 218 }
 219
 220 int CMS_EncryptedData_decrypt(CMS_ContentInfo *cms,
 221                               const unsigned char *key, size_t keylen,
 222                               BIO *dcont, BIO *out, unsigned int flags)
 223 {
 224     BIO *cont;
 225     int r;
 226     if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_encrypted) {
 227         CMSerr(CMS_F_CMS_ENCRYPTEDDATA_DECRYPT,
 228                CMS_R_TYPE_NOT_ENCRYPTED_DATA);
 229         return 0;
 230     }
 231
 232     if (!dcont && !check_content(cms))
 233         return 0;
 234
 235     if (CMS_EncryptedData_set1_key(cms, NULL, key, keylen) <= 0)
 236         return 0;
 237     cont = CMS_dataInit(cms, dcont);
 238     if (!cont)
 239         return 0;
 240     r = cms_copy_content(out, cont, flags);
 241     do_free_upto(cont, dcont);
 242     return r;
 243 }
 244
 245 CMS_ContentInfo *CMS_EncryptedData_encrypt(BIO *in, const EVP_CIPHER *cipher,
 246                                            const unsigned char *key,
 247                                            size_t keylen, unsigned int flags)
 248 {
 249     CMS_ContentInfo *cms;
 250     if (!cipher) {
 251         CMSerr(CMS_F_CMS_ENCRYPTEDDATA_ENCRYPT, CMS_R_NO_CIPHER);
 252         return NULL;
 253     }
 254     cms = CMS_ContentInfo_new();
 255     if (cms == NULL)
 256         return NULL;
 257     if (!CMS_EncryptedData_set1_key(cms, cipher, key, keylen))
 258         return NULL;
 259
 260     if (!(flags & CMS_DETACHED))
 261         CMS_set_detached(cms, 0);
 262
 263     if ((flags & (CMS_STREAM | CMS_PARTIAL))
 264         || CMS_final(cms, in, NULL, flags))
 265         return cms;
 266
 267     CMS_ContentInfo_free(cms);
 268     return NULL;
 269 }
 270
 271 static int cms_signerinfo_verify_cert(CMS_SignerInfo *si,
 272                                       X509_STORE *store,
 273                                       STACK_OF(X509) *certs,
 274                                       STACK_OF(X509_CRL) *crls,
 275                                       unsigned int flags)
 276 {
 277     X509_STORE_CTX ctx;
 278     X509 *signer;
 279     int i, j, r = 0;
 280     CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 281     if (!X509_STORE_CTX_init(&ctx, store, signer, certs)) {
 282         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT, CMS_R_STORE_INIT_ERROR);
 283         goto err;
 284     }
 285     X509_STORE_CTX_set_default(&ctx, "smime_sign");
 286     if (crls)
 287         X509_STORE_CTX_set0_crls(&ctx, crls);
 288
 289     i = X509_verify_cert(&ctx);
 290     if (i <= 0) {
 291         j = X509_STORE_CTX_get_error(&ctx);
 292         CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT,
 293                CMS_R_CERTIFICATE_VERIFY_ERROR);
 294         ERR_add_error_data(2, "Verify error:",
 295                            X509_verify_cert_error_string(j));
 296         goto err;
 297     }
 298     r = 1;
 299  err:
 300     X509_STORE_CTX_cleanup(&ctx);
 301     return r;
 302
 303 }
 304
 305 int CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs,
 306                X509_STORE *store, BIO *dcont, BIO *out, unsigned int flags)
 307 {
 308     CMS_SignerInfo *si;
 309     STACK_OF(CMS_SignerInfo) *sinfos;
 310     STACK_OF(X509) *cms_certs = NULL;
 311     STACK_OF(X509_CRL) *crls = NULL;
 312     X509 *signer;
 313     int i, scount = 0, ret = 0;
 314     BIO *cmsbio = NULL, *tmpin = NULL, *tmpout = NULL;
 315
 316     if (!dcont && !check_content(cms))
 317         return 0;
 318     if (dcont && !(flags & CMS_BINARY)) {
 319         const ASN1_OBJECT *coid = CMS_get0_eContentType(cms);
 320         if (OBJ_obj2nid(coid) == NID_id_ct_asciiTextWithCRLF)
 321             flags |= CMS_ASCIICRLF;
 322     }
 323
 324     /* Attempt to find all signer certificates */
 325
 326     sinfos = CMS_get0_SignerInfos(cms);
 327
 328     if (sk_CMS_SignerInfo_num(sinfos) <= 0) {
 329         CMSerr(CMS_F_CMS_VERIFY, CMS_R_NO_SIGNERS);
 330         goto err;
 331     }
 332
 333     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 334         si = sk_CMS_SignerInfo_value(sinfos, i);
 335         CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 336         if (signer)
 337             scount++;
 338     }
 339
 340     if (scount != sk_CMS_SignerInfo_num(sinfos))
 341         scount += CMS_set1_signers_certs(cms, certs, flags);
 342
 343     if (scount != sk_CMS_SignerInfo_num(sinfos)) {
 344         CMSerr(CMS_F_CMS_VERIFY, CMS_R_SIGNER_CERTIFICATE_NOT_FOUND);
 345         goto err;
 346     }
 347
 348     /* Attempt to verify all signers certs */
 349
 350     if (!(flags & CMS_NO_SIGNER_CERT_VERIFY)) {
 351         cms_certs = CMS_get1_certs(cms);
 352         if (!(flags & CMS_NOCRL))
 353             crls = CMS_get1_crls(cms);
 354         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 355             si = sk_CMS_SignerInfo_value(sinfos, i);
 356             if (!cms_signerinfo_verify_cert(si, store,
 357                                             cms_certs, crls, flags))
 358                 goto err;
 359         }
 360     }
 361
 362     /* Attempt to verify all SignerInfo signed attribute signatures */
 363
 364     if (!(flags & CMS_NO_ATTR_VERIFY)) {
 365         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 366             si = sk_CMS_SignerInfo_value(sinfos, i);
 367             if (CMS_signed_get_attr_count(si) < 0)
 368                 continue;
 369             if (CMS_SignerInfo_verify(si) <= 0)
 370                 goto err;
 371         }
 372     }
 373
 374     /*
 375      * Performance optimization: if the content is a memory BIO then store
 376      * its contents in a temporary read only memory BIO. This avoids
 377      * potentially large numbers of slow copies of data which will occur when
 378      * reading from a read write memory BIO when signatures are calculated.
 379      */
 380
 381     if (dcont && (BIO_method_type(dcont) == BIO_TYPE_MEM)) {
 382         char *ptr;
 383         long len;
 384         len = BIO_get_mem_data(dcont, &ptr);
 385         tmpin = BIO_new_mem_buf(ptr, len);
 386         if (tmpin == NULL) {
 387             CMSerr(CMS_F_CMS_VERIFY, ERR_R_MALLOC_FAILURE);
 388             goto err2;
 389         }
 390     } else
 391         tmpin = dcont;
 392     /*
 393      * If not binary mode and detached generate digests by *writing* through
 394      * the BIO. That makes it possible to canonicalise the input.
 395      */
 396     if (!(flags & SMIME_BINARY) && dcont) {
 397         /*
 398          * Create output BIO so we can either handle text or to ensure
 399          * included content doesn't override detached content.
 400          */
 401         tmpout = cms_get_text_bio(out, flags);
 402         if (!tmpout) {
 403             CMSerr(CMS_F_CMS_VERIFY, ERR_R_MALLOC_FAILURE);
 404             goto err;
 405         }
 406         cmsbio = CMS_dataInit(cms, tmpout);
 407         if (!cmsbio)
 408             goto err;
 409         /*
 410          * Don't use SMIME_TEXT for verify: it adds headers and we want to
 411          * remove them.
 412          */
 413         SMIME_crlf_copy(dcont, cmsbio, flags & ~SMIME_TEXT);
 414
 415         if (flags & CMS_TEXT) {
 416             if (!SMIME_text(tmpout, out)) {
 417                 CMSerr(CMS_F_CMS_VERIFY, CMS_R_SMIME_TEXT_ERROR);
 418                 goto err;
 419             }
 420         }
 421     } else {
 422         cmsbio = CMS_dataInit(cms, tmpin);
 423         if (!cmsbio)
 424             goto err;
 425
 426         if (!cms_copy_content(out, cmsbio, flags))
 427             goto err;
 428
 429     }
 430     if (!(flags & CMS_NO_CONTENT_VERIFY)) {
 431         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 432             si = sk_CMS_SignerInfo_value(sinfos, i);
 433             if (CMS_SignerInfo_verify_content(si, cmsbio) <= 0) {
 434                 CMSerr(CMS_F_CMS_VERIFY, CMS_R_CONTENT_VERIFY_ERROR);
 435                 goto err;
 436             }
 437         }
 438     }
 439
 440     ret = 1;
 441
 442  err:
 443     if (!(flags & SMIME_BINARY) && dcont) {
 444         do_free_upto(cmsbio, tmpout);
 445         if (tmpin != dcont)
 446             BIO_free(tmpin);
 447     } else {
 448         if (dcont && (tmpin == dcont))
 449             do_free_upto(cmsbio, dcont);
 450         else
 451             BIO_free_all(cmsbio);
 452     }
 453
 454     if (out != tmpout)
 455         BIO_free_all(tmpout);
 456
 457  err2:
 458     sk_X509_pop_free(cms_certs, X509_free);
 459     sk_X509_CRL_pop_free(crls, X509_CRL_free);
 460
 461     return ret;
 462 }
 463
 464 int CMS_verify_receipt(CMS_ContentInfo *rcms, CMS_ContentInfo *ocms,
 465                        STACK_OF(X509) *certs,
 466                        X509_STORE *store, unsigned int flags)
 467 {
 468     int r;
 469     flags &= ~(CMS_DETACHED | CMS_TEXT);
 470     r = CMS_verify(rcms, certs, store, NULL, NULL, flags);
 471     if (r <= 0)
 472         return r;
 473     return cms_Receipt_verify(rcms, ocms);
 474 }
 475
 476 CMS_ContentInfo *CMS_sign(X509 *signcert, EVP_PKEY *pkey,
 477                           STACK_OF(X509) *certs, BIO *data,
 478                           unsigned int flags)
 479 {
 480     CMS_ContentInfo *cms;
 481     int i;
 482
 483     cms = CMS_ContentInfo_new();
 484     if (cms == NULL || !CMS_SignedData_init(cms))
 485         goto merr;
 486     if (flags & CMS_ASCIICRLF
 487         && !CMS_set1_eContentType(cms,
 488                                   OBJ_nid2obj(NID_id_ct_asciiTextWithCRLF)))
 489         goto err;
 490
 491     if (pkey && !CMS_add1_signer(cms, signcert, pkey, NULL, flags)) {
 492         CMSerr(CMS_F_CMS_SIGN, CMS_R_ADD_SIGNER_ERROR);
 493         goto err;
 494     }
 495
 496     for (i = 0; i < sk_X509_num(certs); i++) {
 497         X509 *x = sk_X509_value(certs, i);
 498         if (!CMS_add1_cert(cms, x))
 499             goto merr;
 500     }
 501
 502     if (!(flags & CMS_DETACHED))
 503         CMS_set_detached(cms, 0);
 504
 505     if ((flags & (CMS_STREAM | CMS_PARTIAL))
 506         || CMS_final(cms, data, NULL, flags))
 507         return cms;
 508     else
 509         goto err;
 510
 511  merr:
 512     CMSerr(CMS_F_CMS_SIGN, ERR_R_MALLOC_FAILURE);
 513
 514  err:
 515     CMS_ContentInfo_free(cms);
 516     return NULL;
 517 }
 518
 519 CMS_ContentInfo *CMS_sign_receipt(CMS_SignerInfo *si,
 520                                   X509 *signcert, EVP_PKEY *pkey,
 521                                   STACK_OF(X509) *certs, unsigned int flags)
 522 {
 523     CMS_SignerInfo *rct_si;
 524     CMS_ContentInfo *cms = NULL;
 525     ASN1_OCTET_STRING **pos, *os;
 526     BIO *rct_cont = NULL;
 527     int r = 0;
 528
 529     flags &= ~(CMS_STREAM | CMS_TEXT);
 530     /* Not really detached but avoids content being allocated */
 531     flags |= CMS_PARTIAL | CMS_BINARY | CMS_DETACHED;
 532     if (!pkey || !signcert) {
 533         CMSerr(CMS_F_CMS_SIGN_RECEIPT, CMS_R_NO_KEY_OR_CERT);
 534         return NULL;
 535     }
 536
 537     /* Initialize signed data */
 538
 539     cms = CMS_sign(NULL, NULL, certs, NULL, flags);
 540     if (!cms)
 541         goto err;
 542
 543     /* Set inner content type to signed receipt */
 544     if (!CMS_set1_eContentType(cms, OBJ_nid2obj(NID_id_smime_ct_receipt)))
 545         goto err;
 546
 547     rct_si = CMS_add1_signer(cms, signcert, pkey, NULL, flags);
 548     if (!rct_si) {
 549         CMSerr(CMS_F_CMS_SIGN_RECEIPT, CMS_R_ADD_SIGNER_ERROR);
 550         goto err;
 551     }
 552
 553     os = cms_encode_Receipt(si);
 554
 555     if (!os)
 556         goto err;
 557
 558     /* Set content to digest */
 559     rct_cont = BIO_new_mem_buf(os->data, os->length);
 560     if (!rct_cont)
 561         goto err;
 562
 563     /* Add msgSigDigest attribute */
 564
 565     if (!cms_msgSigDigest_add1(rct_si, si))
 566         goto err;
 567
 568     /* Finalize structure */
 569     if (!CMS_final(cms, rct_cont, NULL, flags))
 570         goto err;
 571
 572     /* Set embedded content */
 573     pos = CMS_get0_content(cms);
 574     *pos = os;
 575
 576     r = 1;
 577
 578  err:
 579     BIO_free(rct_cont);
 580     if (r)
 581         return cms;
 582     CMS_ContentInfo_free(cms);
 583     return NULL;
 584
 585 }
 586
 587 CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *data,
 588                              const EVP_CIPHER *cipher, unsigned int flags)
 589 {
 590     CMS_ContentInfo *cms;
 591     int i;
 592     X509 *recip;
 593     cms = CMS_EnvelopedData_create(cipher);
 594     if (!cms)
 595         goto merr;
 596     for (i = 0; i < sk_X509_num(certs); i++) {
 597         recip = sk_X509_value(certs, i);
 598         if (!CMS_add1_recipient_cert(cms, recip, flags)) {
 599             CMSerr(CMS_F_CMS_ENCRYPT, CMS_R_RECIPIENT_ERROR);
 600             goto err;
 601         }
 602     }
 603
 604     if (!(flags & CMS_DETACHED))
 605         CMS_set_detached(cms, 0);
 606
 607     if ((flags & (CMS_STREAM | CMS_PARTIAL))
 608         || CMS_final(cms, data, NULL, flags))
 609         return cms;
 610     else
 611         goto err;
 612
 613  merr:
 614     CMSerr(CMS_F_CMS_ENCRYPT, ERR_R_MALLOC_FAILURE);
 615  err:
 616     CMS_ContentInfo_free(cms);
 617     return NULL;
 618 }
 619
 620 static int cms_kari_set1_pkey(CMS_ContentInfo *cms, CMS_RecipientInfo *ri,
 621                               EVP_PKEY *pk, X509 *cert)
 622 {
 623     int i;
 624     STACK_OF(CMS_RecipientEncryptedKey) *reks;
 625     CMS_RecipientEncryptedKey *rek;
 626     reks = CMS_RecipientInfo_kari_get0_reks(ri);
 627     if (!cert)
 628         return 0;
 629     for (i = 0; i < sk_CMS_RecipientEncryptedKey_num(reks); i++) {
 630         int rv;
 631         rek = sk_CMS_RecipientEncryptedKey_value(reks, i);
 632         if (CMS_RecipientEncryptedKey_cert_cmp(rek, cert))
 633             continue;
 634         CMS_RecipientInfo_kari_set0_pkey(ri, pk);
 635         rv = CMS_RecipientInfo_kari_decrypt(cms, ri, rek);
 636         CMS_RecipientInfo_kari_set0_pkey(ri, NULL);
 637         if (rv > 0)
 638             return 1;
 639         return -1;
 640     }
 641     return 0;
 642 }
 643
 644 int CMS_decrypt_set1_pkey(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert)
 645 {
 646     STACK_OF(CMS_RecipientInfo) *ris;
 647     CMS_RecipientInfo *ri;
 648     int i, r, ri_type;
 649     int debug = 0, match_ri = 0;
 650     ris = CMS_get0_RecipientInfos(cms);
 651     if (ris)
 652         debug = cms->d.envelopedData->encryptedContentInfo->debug;
 653     ri_type = cms_pkey_get_ri_type(pk);
 654     if (ri_type == CMS_RECIPINFO_NONE) {
 655         CMSerr(CMS_F_CMS_DECRYPT_SET1_PKEY,
 656                CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 657         return 0;
 658     }
 659
 660     for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
 661         ri = sk_CMS_RecipientInfo_value(ris, i);
 662         if (CMS_RecipientInfo_type(ri) != ri_type)
 663             continue;
 664         match_ri = 1;
 665         if (ri_type == CMS_RECIPINFO_AGREE) {
 666             r = cms_kari_set1_pkey(cms, ri, pk, cert);
 667             if (r > 0)
 668                 return 1;
 669             if (r < 0)
 670                 return 0;
 671         }
 672         /*
 673          * If we have a cert try matching RecipientInfo otherwise try them
 674          * all.
 675          */
 676         else if (!cert || !CMS_RecipientInfo_ktri_cert_cmp(ri, cert)) {
 677             CMS_RecipientInfo_set0_pkey(ri, pk);
 678             r = CMS_RecipientInfo_decrypt(cms, ri);
 679             CMS_RecipientInfo_set0_pkey(ri, NULL);
 680             if (cert) {
 681                 /*
 682                  * If not debugging clear any error and return success to
 683                  * avoid leaking of information useful to MMA
 684                  */
 685                 if (!debug) {
 686                     ERR_clear_error();
 687                     return 1;
 688                 }
 689                 if (r > 0)
 690                     return 1;
 691                 CMSerr(CMS_F_CMS_DECRYPT_SET1_PKEY, CMS_R_DECRYPT_ERROR);
 692                 return 0;
 693             }
 694             /*
 695              * If no cert and not debugging don't leave loop after first
 696              * successful decrypt. Always attempt to decrypt all recipients
 697              * to avoid leaking timing of a successful decrypt.
 698              */
 699             else if (r > 0 && debug)
 700                 return 1;
 701         }
 702     }
 703     /* If no cert and not debugging always return success */
 704     if (match_ri && !cert && !debug) {
 705         ERR_clear_error();
 706         return 1;
 707     }
 708
 709     CMSerr(CMS_F_CMS_DECRYPT_SET1_PKEY, CMS_R_NO_MATCHING_RECIPIENT);
 710     return 0;
 711
 712 }
 713
 714 int CMS_decrypt_set1_key(CMS_ContentInfo *cms,
 715                          unsigned char *key, size_t keylen,
 716                          unsigned char *id, size_t idlen)
 717 {
 718     STACK_OF(CMS_RecipientInfo) *ris;
 719     CMS_RecipientInfo *ri;
 720     int i, r;
 721     ris = CMS_get0_RecipientInfos(cms);
 722     for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
 723         ri = sk_CMS_RecipientInfo_value(ris, i);
 724         if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_KEK)
 725             continue;
 726
 727         /*
 728          * If we have an id try matching RecipientInfo otherwise try them
 729          * all.
 730          */
 731         if (!id || (CMS_RecipientInfo_kekri_id_cmp(ri, id, idlen) == 0)) {
 732             CMS_RecipientInfo_set0_key(ri, key, keylen);
 733             r = CMS_RecipientInfo_decrypt(cms, ri);
 734             CMS_RecipientInfo_set0_key(ri, NULL, 0);
 735             if (r > 0)
 736                 return 1;
 737             if (id) {
 738                 CMSerr(CMS_F_CMS_DECRYPT_SET1_KEY, CMS_R_DECRYPT_ERROR);
 739                 return 0;
 740             }
 741             ERR_clear_error();
 742         }
 743     }
 744
 745     CMSerr(CMS_F_CMS_DECRYPT_SET1_KEY, CMS_R_NO_MATCHING_RECIPIENT);
 746     return 0;
 747
 748 }
 749
 750 int CMS_decrypt_set1_password(CMS_ContentInfo *cms,
 751                               unsigned char *pass, ossl_ssize_t passlen)
 752 {
 753     STACK_OF(CMS_RecipientInfo) *ris;
 754     CMS_RecipientInfo *ri;
 755     int i, r;
 756     ris = CMS_get0_RecipientInfos(cms);
 757     for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
 758         ri = sk_CMS_RecipientInfo_value(ris, i);
 759         if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_PASS)
 760             continue;
 761         CMS_RecipientInfo_set0_password(ri, pass, passlen);
 762         r = CMS_RecipientInfo_decrypt(cms, ri);
 763         CMS_RecipientInfo_set0_password(ri, NULL, 0);
 764         if (r > 0)
 765             return 1;
 766     }
 767
 768     CMSerr(CMS_F_CMS_DECRYPT_SET1_PASSWORD, CMS_R_NO_MATCHING_RECIPIENT);
 769     return 0;
 770
 771 }
 772
 773 int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert,
 774                 BIO *dcont, BIO *out, unsigned int flags)
 775 {
 776     int r;
 777     BIO *cont;
 778     if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_enveloped) {
 779         CMSerr(CMS_F_CMS_DECRYPT, CMS_R_TYPE_NOT_ENVELOPED_DATA);
 780         return 0;
 781     }
 782     if (!dcont && !check_content(cms))
 783         return 0;
 784     if (flags & CMS_DEBUG_DECRYPT)
 785         cms->d.envelopedData->encryptedContentInfo->debug = 1;
 786     else
 787         cms->d.envelopedData->encryptedContentInfo->debug = 0;
 788     if (!pk && !cert && !dcont && !out)
 789         return 1;
 790     if (pk && !CMS_decrypt_set1_pkey(cms, pk, cert))
 791         return 0;
 792     cont = CMS_dataInit(cms, dcont);
 793     if (!cont)
 794         return 0;
 795     r = cms_copy_content(out, cont, flags);
 796     do_free_upto(cont, dcont);
 797     return r;
 798 }
 799
 800 int CMS_final(CMS_ContentInfo *cms, BIO *data, BIO *dcont, unsigned int flags)
 801 {
 802     BIO *cmsbio;
 803     int ret = 0;
 804
 805     if ((cmsbio = CMS_dataInit(cms, dcont)) == NULL) {
 806         CMSerr(CMS_F_CMS_FINAL, CMS_R_CMS_LIB);
 807         return 0;
 808     }
 809
 810     SMIME_crlf_copy(data, cmsbio, flags);
 811
 812     (void)BIO_flush(cmsbio);
 813
 814     if (!CMS_dataFinal(cms, cmsbio)) {
 815         CMSerr(CMS_F_CMS_FINAL, CMS_R_CMS_DATAFINAL_ERROR);
 816         goto err;
 817     }
 818
 819     ret = 1;
 820
 821  err:
 822     do_free_upto(cmsbio, dcont);
 823
 824     return ret;
 825
 826 }
 827
 828 #ifdef ZLIB
 829
 830 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 831                    unsigned int flags)
 832 {
 833     BIO *cont;
 834     int r;
 835     if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_id_smime_ct_compressedData) {
 836         CMSerr(CMS_F_CMS_UNCOMPRESS, CMS_R_TYPE_NOT_COMPRESSED_DATA);
 837         return 0;
 838     }
 839
 840     if (!dcont && !check_content(cms))
 841         return 0;
 842
 843     cont = CMS_dataInit(cms, dcont);
 844     if (!cont)
 845         return 0;
 846     r = cms_copy_content(out, cont, flags);
 847     do_free_upto(cont, dcont);
 848     return r;
 849 }
 850
 851 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 852 {
 853     CMS_ContentInfo *cms;
 854     if (comp_nid <= 0)
 855         comp_nid = NID_zlib_compression;
 856     cms = cms_CompressedData_create(comp_nid);
 857     if (!cms)
 858         return NULL;
 859
 860     if (!(flags & CMS_DETACHED))
 861         CMS_set_detached(cms, 0);
 862
 863     if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
 864         return cms;
 865
 866     CMS_ContentInfo_free(cms);
 867     return NULL;
 868 }
 869
 870 #else
 871
 872 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 873                    unsigned int flags)
 874 {
 875     CMSerr(CMS_F_CMS_UNCOMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 876     return 0;
 877 }
 878
 879 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 880 {
 881     CMSerr(CMS_F_CMS_COMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 882     return NULL;
 883 }
 884
 885 #endif