crypto/cms/cms_smime.c

   1 /*
   2  * Copyright 2008-2022 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/x509.h>
  13 #include <openssl/x509v3.h>
  14 #include <openssl/err.h>
  15 #include <openssl/cms.h>
  16 #include "cms_local.h"
  17 #include "crypto/asn1.h"
  18
  19 static BIO *cms_get_text_bio(BIO *out, unsigned int flags)
  20 {
  21     BIO *rbio;
  22
  23     if (out == NULL)
  24         rbio = BIO_new(BIO_s_null());
  25     else if (flags & CMS_TEXT) {
  26         rbio = BIO_new(BIO_s_mem());
  27         BIO_set_mem_eof_return(rbio, 0);
  28     } else
  29         rbio = out;
  30     return rbio;
  31 }
  32
  33 static int cms_copy_content(BIO *out, BIO *in, unsigned int flags)
  34 {
  35     unsigned char buf[4096];
  36     int r = 0, i;
  37     BIO *tmpout;
  38
  39     tmpout = cms_get_text_bio(out, flags);
  40
  41     if (tmpout == NULL) {
  42         ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
  43         goto err;
  44     }
  45
  46     /* Read all content through chain to process digest, decrypt etc */
  47     for (;;) {
  48         i = BIO_read(in, buf, sizeof(buf));
  49         if (i <= 0) {
  50             if (BIO_method_type(in) == BIO_TYPE_CIPHER) {
  51                 if (BIO_get_cipher_status(in) <= 0)
  52                     goto err;
  53             }
  54             if (i < 0)
  55                 goto err;
  56             break;
  57         }
  58
  59         if (tmpout != NULL && (BIO_write(tmpout, buf, i) != i))
  60             goto err;
  61     }
  62
  63     if (flags & CMS_TEXT) {
  64         if (!SMIME_text(tmpout, out)) {
  65             ERR_raise(ERR_LIB_CMS, CMS_R_SMIME_TEXT_ERROR);
  66             goto err;
  67         }
  68     }
  69
  70     r = 1;
  71  err:
  72     if (tmpout != out)
  73         BIO_free(tmpout);
  74     return r;
  75
  76 }
  77
  78 static int check_content(CMS_ContentInfo *cms)
  79 {
  80     ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
  81
  82     if (pos == NULL || *pos == NULL) {
  83         ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT);
  84         return 0;
  85     }
  86     return 1;
  87 }
  88
  89 static void do_free_upto(BIO *f, BIO *upto)
  90 {
  91     if (upto != NULL) {
  92         BIO *tbio;
  93
  94         do {
  95             tbio = BIO_pop(f);
  96             BIO_free(f);
  97             f = tbio;
  98         } while (f != NULL && f != upto);
  99     } else {
 100         BIO_free_all(f);
 101     }
 102 }
 103
 104 int CMS_data(CMS_ContentInfo *cms, BIO *out, unsigned int flags)
 105 {
 106     BIO *cont;
 107     int r;
 108
 109     if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_data) {
 110         ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_DATA);
 111         return 0;
 112     }
 113     cont = CMS_dataInit(cms, NULL);
 114     if (cont == NULL)
 115         return 0;
 116     r = cms_copy_content(out, cont, flags);
 117     BIO_free_all(cont);
 118     return r;
 119 }
 120
 121 CMS_ContentInfo *CMS_data_create_ex(BIO *in, unsigned int flags,
 122                                     OSSL_LIB_CTX *libctx, const char *propq)
 123 {
 124     CMS_ContentInfo *cms = ossl_cms_Data_create(libctx, propq);
 125
 126     if (cms == NULL)
 127         return NULL;
 128
 129     if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
 130         return cms;
 131
 132     CMS_ContentInfo_free(cms);
 133     return NULL;
 134 }
 135
 136 CMS_ContentInfo *CMS_data_create(BIO *in, unsigned int flags)
 137 {
 138     return CMS_data_create_ex(in, flags, NULL, NULL);
 139 }
 140
 141 int CMS_digest_verify(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 142                       unsigned int flags)
 143 {
 144     BIO *cont;
 145     int r;
 146
 147     if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_digest) {
 148         ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_DIGESTED_DATA);
 149         return 0;
 150     }
 151
 152     if (dcont == NULL && !check_content(cms))
 153         return 0;
 154
 155     cont = CMS_dataInit(cms, dcont);
 156     if (cont == NULL)
 157         return 0;
 158
 159     r = cms_copy_content(out, cont, flags);
 160     if (r)
 161         r = ossl_cms_DigestedData_do_final(cms, cont, 1);
 162     do_free_upto(cont, dcont);
 163     return r;
 164 }
 165
 166 CMS_ContentInfo *CMS_digest_create_ex(BIO *in, const EVP_MD *md,
 167                                       unsigned int flags, OSSL_LIB_CTX *ctx,
 168                                       const char *propq)
 169 {
 170     CMS_ContentInfo *cms;
 171
 172     /*
 173      * Because the EVP_MD is cached and can be a legacy algorithm, we
 174      * cannot fetch the algorithm if it isn't supplied.
 175      */
 176     if (md == NULL)
 177         md = EVP_sha1();
 178     cms = ossl_cms_DigestedData_create(md, ctx, propq);
 179     if (cms == NULL)
 180         return NULL;
 181
 182     if (!(flags & CMS_DETACHED))
 183         CMS_set_detached(cms, 0);
 184
 185     if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
 186         return cms;
 187
 188     CMS_ContentInfo_free(cms);
 189     return NULL;
 190 }
 191
 192 CMS_ContentInfo *CMS_digest_create(BIO *in, const EVP_MD *md,
 193                                    unsigned int flags)
 194 {
 195     return CMS_digest_create_ex(in, md, flags, NULL, NULL);
 196 }
 197
 198 int CMS_EncryptedData_decrypt(CMS_ContentInfo *cms,
 199                               const unsigned char *key, size_t keylen,
 200                               BIO *dcont, BIO *out, unsigned int flags)
 201 {
 202     BIO *cont;
 203     int r;
 204
 205     if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_encrypted) {
 206         ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_ENCRYPTED_DATA);
 207         return 0;
 208     }
 209
 210     if (dcont == NULL && !check_content(cms))
 211         return 0;
 212
 213     if (CMS_EncryptedData_set1_key(cms, NULL, key, keylen) <= 0)
 214         return 0;
 215     cont = CMS_dataInit(cms, dcont);
 216     if (cont == NULL)
 217         return 0;
 218     r = cms_copy_content(out, cont, flags);
 219     do_free_upto(cont, dcont);
 220     return r;
 221 }
 222
 223 CMS_ContentInfo *CMS_EncryptedData_encrypt_ex(BIO *in, const EVP_CIPHER *cipher,
 224                                               const unsigned char *key,
 225                                               size_t keylen, unsigned int flags,
 226                                               OSSL_LIB_CTX *libctx,
 227                                               const char *propq)
 228 {
 229     CMS_ContentInfo *cms;
 230
 231     if (cipher == NULL) {
 232         ERR_raise(ERR_LIB_CMS, CMS_R_NO_CIPHER);
 233         return NULL;
 234     }
 235     cms = CMS_ContentInfo_new_ex(libctx, propq);
 236     if (cms == NULL)
 237         return NULL;
 238     if (!CMS_EncryptedData_set1_key(cms, cipher, key, keylen))
 239         return NULL;
 240
 241     if (!(flags & CMS_DETACHED))
 242         CMS_set_detached(cms, 0);
 243
 244     if ((flags & (CMS_STREAM | CMS_PARTIAL))
 245         || CMS_final(cms, in, NULL, flags))
 246         return cms;
 247
 248     CMS_ContentInfo_free(cms);
 249     return NULL;
 250 }
 251
 252 CMS_ContentInfo *CMS_EncryptedData_encrypt(BIO *in, const EVP_CIPHER *cipher,
 253                                            const unsigned char *key,
 254                                            size_t keylen, unsigned int flags)
 255 {
 256     return CMS_EncryptedData_encrypt_ex(in, cipher, key, keylen, flags, NULL,
 257                                         NULL);
 258 }
 259
 260 static int cms_signerinfo_verify_cert(CMS_SignerInfo *si,
 261                                       X509_STORE *store,
 262                                       STACK_OF(X509) *certs,
 263                                       STACK_OF(X509_CRL) *crls,
 264                                       STACK_OF(X509) **chain,
 265                                       const CMS_CTX *cms_ctx)
 266 {
 267     X509_STORE_CTX *ctx;
 268     X509 *signer;
 269     int i, j, r = 0;
 270
 271     ctx = X509_STORE_CTX_new_ex(ossl_cms_ctx_get0_libctx(cms_ctx),
 272                                 ossl_cms_ctx_get0_propq(cms_ctx));
 273     if (ctx == NULL) {
 274         ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 275         goto err;
 276     }
 277     CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 278     if (!X509_STORE_CTX_init(ctx, store, signer, certs)) {
 279         ERR_raise(ERR_LIB_CMS, CMS_R_STORE_INIT_ERROR);
 280         goto err;
 281     }
 282     X509_STORE_CTX_set_default(ctx, "smime_sign");
 283     if (crls != NULL)
 284         X509_STORE_CTX_set0_crls(ctx, crls);
 285
 286     i = X509_verify_cert(ctx);
 287     if (i <= 0) {
 288         j = X509_STORE_CTX_get_error(ctx);
 289         ERR_raise_data(ERR_LIB_CMS, CMS_R_CERTIFICATE_VERIFY_ERROR,
 290                        "Verify error: %s", X509_verify_cert_error_string(j));
 291         goto err;
 292     }
 293     r = 1;
 294
 295     /* also send back the trust chain when required */
 296     if (chain != NULL)
 297         *chain = X509_STORE_CTX_get1_chain(ctx);
 298  err:
 299     X509_STORE_CTX_free(ctx);
 300     return r;
 301
 302 }
 303
 304 int CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs,
 305                X509_STORE *store, BIO *dcont, BIO *out, unsigned int flags)
 306 {
 307     CMS_SignerInfo *si;
 308     STACK_OF(CMS_SignerInfo) *sinfos;
 309     STACK_OF(X509) *cms_certs = NULL;
 310     STACK_OF(X509_CRL) *crls = NULL;
 311     STACK_OF(X509) **si_chains = NULL;
 312     X509 *signer;
 313     int i, scount = 0, ret = 0;
 314     BIO *cmsbio = NULL, *tmpin = NULL, *tmpout = NULL;
 315     int cadesVerify = (flags & CMS_CADES) != 0;
 316     const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
 317
 318     if (dcont == NULL && !check_content(cms))
 319         return 0;
 320     if (dcont != NULL && !(flags & CMS_BINARY)) {
 321         const ASN1_OBJECT *coid = CMS_get0_eContentType(cms);
 322
 323         if (OBJ_obj2nid(coid) == NID_id_ct_asciiTextWithCRLF)
 324             flags |= CMS_ASCIICRLF;
 325     }
 326
 327     /* Attempt to find all signer certificates */
 328
 329     sinfos = CMS_get0_SignerInfos(cms);
 330
 331     if (sk_CMS_SignerInfo_num(sinfos) <= 0) {
 332         ERR_raise(ERR_LIB_CMS, CMS_R_NO_SIGNERS);
 333         goto err;
 334     }
 335
 336     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 337         si = sk_CMS_SignerInfo_value(sinfos, i);
 338         CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 339         if (signer)
 340             scount++;
 341     }
 342
 343     if (scount != sk_CMS_SignerInfo_num(sinfos))
 344         scount += CMS_set1_signers_certs(cms, certs, flags);
 345
 346     if (scount != sk_CMS_SignerInfo_num(sinfos)) {
 347         ERR_raise(ERR_LIB_CMS, CMS_R_SIGNER_CERTIFICATE_NOT_FOUND);
 348         goto err;
 349     }
 350
 351     /* Attempt to verify all signers certs */
 352     /* at this point scount == sk_CMS_SignerInfo_num(sinfos) */
 353
 354     if ((flags & CMS_NO_SIGNER_CERT_VERIFY) == 0 || cadesVerify) {
 355         if (cadesVerify) {
 356             /* Certificate trust chain is required to check CAdES signature */
 357             si_chains = OPENSSL_zalloc(scount * sizeof(si_chains[0]));
 358             if (si_chains == NULL) {
 359                 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 360                 goto err;
 361             }
 362         }
 363         cms_certs = CMS_get1_certs(cms);
 364         if (!(flags & CMS_NOCRL))
 365             crls = CMS_get1_crls(cms);
 366         for (i = 0; i < scount; i++) {
 367             si = sk_CMS_SignerInfo_value(sinfos, i);
 368
 369             if (!cms_signerinfo_verify_cert(si, store, cms_certs, crls,
 370                                             si_chains ? &si_chains[i] : NULL,
 371                                             ctx))
 372                 goto err;
 373         }
 374     }
 375
 376     /* Attempt to verify all SignerInfo signed attribute signatures */
 377
 378     if ((flags & CMS_NO_ATTR_VERIFY) == 0 || cadesVerify) {
 379         for (i = 0; i < scount; i++) {
 380             si = sk_CMS_SignerInfo_value(sinfos, i);
 381             if (CMS_signed_get_attr_count(si) < 0)
 382                 continue;
 383             if (CMS_SignerInfo_verify(si) <= 0)
 384                 goto err;
 385             if (cadesVerify) {
 386                 STACK_OF(X509) *si_chain = si_chains ? si_chains[i] : NULL;
 387
 388                 if (ossl_cms_check_signing_certs(si, si_chain) <= 0)
 389                     goto err;
 390             }
 391         }
 392     }
 393
 394     /*
 395      * Performance optimization: if the content is a memory BIO then store
 396      * its contents in a temporary read only memory BIO. This avoids
 397      * potentially large numbers of slow copies of data which will occur when
 398      * reading from a read write memory BIO when signatures are calculated.
 399      */
 400
 401     if (dcont != NULL && (BIO_method_type(dcont) == BIO_TYPE_MEM)) {
 402         char *ptr;
 403         long len;
 404
 405         len = BIO_get_mem_data(dcont, &ptr);
 406         tmpin = (len == 0) ? dcont : BIO_new_mem_buf(ptr, len);
 407         if (tmpin == NULL) {
 408             ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 409             goto err2;
 410         }
 411     } else {
 412         tmpin = dcont;
 413     }
 414     /*
 415      * If not binary mode and detached generate digests by *writing* through
 416      * the BIO. That makes it possible to canonicalise the input.
 417      */
 418     if (!(flags & SMIME_BINARY) && dcont) {
 419         /*
 420          * Create output BIO so we can either handle text or to ensure
 421          * included content doesn't override detached content.
 422          */
 423         tmpout = cms_get_text_bio(out, flags);
 424         if (tmpout == NULL) {
 425             ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 426             goto err;
 427         }
 428         cmsbio = CMS_dataInit(cms, tmpout);
 429         if (cmsbio == NULL)
 430             goto err;
 431         /*
 432          * Don't use SMIME_TEXT for verify: it adds headers and we want to
 433          * remove them.
 434          */
 435         if (!SMIME_crlf_copy(dcont, cmsbio, flags & ~SMIME_TEXT))
 436             goto err;
 437
 438         if (flags & CMS_TEXT) {
 439             if (!SMIME_text(tmpout, out)) {
 440                 ERR_raise(ERR_LIB_CMS, CMS_R_SMIME_TEXT_ERROR);
 441                 goto err;
 442             }
 443         }
 444     } else {
 445         cmsbio = CMS_dataInit(cms, tmpin);
 446         if (cmsbio == NULL)
 447             goto err;
 448
 449         if (!cms_copy_content(out, cmsbio, flags))
 450             goto err;
 451
 452     }
 453     if (!(flags & CMS_NO_CONTENT_VERIFY)) {
 454         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 455             si = sk_CMS_SignerInfo_value(sinfos, i);
 456             if (CMS_SignerInfo_verify_content(si, cmsbio) <= 0) {
 457                 ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_VERIFY_ERROR);
 458                 goto err;
 459             }
 460         }
 461     }
 462
 463     ret = 1;
 464  err:
 465     if (!(flags & SMIME_BINARY) && dcont) {
 466         do_free_upto(cmsbio, tmpout);
 467         if (tmpin != dcont)
 468             BIO_free(tmpin);
 469     } else {
 470         if (dcont && (tmpin == dcont))
 471             do_free_upto(cmsbio, dcont);
 472         else
 473             BIO_free_all(cmsbio);
 474     }
 475
 476     if (out != tmpout)
 477         BIO_free_all(tmpout);
 478
 479  err2:
 480     if (si_chains != NULL) {
 481         for (i = 0; i < scount; ++i)
 482             OSSL_STACK_OF_X509_free(si_chains[i]);
 483         OPENSSL_free(si_chains);
 484     }
 485     OSSL_STACK_OF_X509_free(cms_certs);
 486     sk_X509_CRL_pop_free(crls, X509_CRL_free);
 487
 488     return ret;
 489 }
 490
 491 int CMS_verify_receipt(CMS_ContentInfo *rcms, CMS_ContentInfo *ocms,
 492                        STACK_OF(X509) *certs,
 493                        X509_STORE *store, unsigned int flags)
 494 {
 495     int r;
 496
 497     flags &= ~(CMS_DETACHED | CMS_TEXT);
 498     r = CMS_verify(rcms, certs, store, NULL, NULL, flags);
 499     if (r <= 0)
 500         return r;
 501     return ossl_cms_Receipt_verify(rcms, ocms);
 502 }
 503
 504 CMS_ContentInfo *CMS_sign_ex(X509 *signcert, EVP_PKEY *pkey,
 505                              STACK_OF(X509) *certs, BIO *data,
 506                              unsigned int flags, OSSL_LIB_CTX *libctx,
 507                              const char *propq)
 508 {
 509     CMS_ContentInfo *cms;
 510     int i;
 511
 512     cms = CMS_ContentInfo_new_ex(libctx, propq);
 513     if (cms == NULL || !CMS_SignedData_init(cms))
 514         goto merr;
 515     if (flags & CMS_ASCIICRLF
 516         && !CMS_set1_eContentType(cms,
 517                                   OBJ_nid2obj(NID_id_ct_asciiTextWithCRLF)))
 518         goto err;
 519
 520     if (pkey != NULL && !CMS_add1_signer(cms, signcert, pkey, NULL, flags)) {
 521         ERR_raise(ERR_LIB_CMS, CMS_R_ADD_SIGNER_ERROR);
 522         goto err;
 523     }
 524
 525     for (i = 0; i < sk_X509_num(certs); i++) {
 526         X509 *x = sk_X509_value(certs, i);
 527
 528         if (!CMS_add1_cert(cms, x))
 529             goto merr;
 530     }
 531
 532     if (!(flags & CMS_DETACHED))
 533         CMS_set_detached(cms, 0);
 534
 535     if ((flags & (CMS_STREAM | CMS_PARTIAL))
 536         || CMS_final(cms, data, NULL, flags))
 537         return cms;
 538     else
 539         goto err;
 540
 541  merr:
 542     ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 543
 544  err:
 545     CMS_ContentInfo_free(cms);
 546     return NULL;
 547 }
 548
 549 CMS_ContentInfo *CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
 550                           BIO *data, unsigned int flags)
 551 {
 552     return CMS_sign_ex(signcert, pkey, certs, data, flags, NULL, NULL);
 553 }
 554
 555 CMS_ContentInfo *CMS_sign_receipt(CMS_SignerInfo *si,
 556                                   X509 *signcert, EVP_PKEY *pkey,
 557                                   STACK_OF(X509) *certs, unsigned int flags)
 558 {
 559     CMS_SignerInfo *rct_si;
 560     CMS_ContentInfo *cms = NULL;
 561     ASN1_OCTET_STRING **pos, *os;
 562     BIO *rct_cont = NULL;
 563     int r = 0;
 564     const CMS_CTX *ctx = si->cms_ctx;
 565
 566     flags &= ~(CMS_STREAM | CMS_TEXT);
 567     /* Not really detached but avoids content being allocated */
 568     flags |= CMS_PARTIAL | CMS_BINARY | CMS_DETACHED;
 569     if (pkey == NULL || signcert == NULL) {
 570         ERR_raise(ERR_LIB_CMS, CMS_R_NO_KEY_OR_CERT);
 571         return NULL;
 572     }
 573
 574     /* Initialize signed data */
 575
 576     cms = CMS_sign_ex(NULL, NULL, certs, NULL, flags,
 577                       ossl_cms_ctx_get0_libctx(ctx),
 578                       ossl_cms_ctx_get0_propq(ctx));
 579     if (cms == NULL)
 580         goto err;
 581
 582     /* Set inner content type to signed receipt */
 583     if (!CMS_set1_eContentType(cms, OBJ_nid2obj(NID_id_smime_ct_receipt)))
 584         goto err;
 585
 586     rct_si = CMS_add1_signer(cms, signcert, pkey, NULL, flags);
 587     if (!rct_si) {
 588         ERR_raise(ERR_LIB_CMS, CMS_R_ADD_SIGNER_ERROR);
 589         goto err;
 590     }
 591
 592     os = ossl_cms_encode_Receipt(si);
 593     if (os == NULL)
 594         goto err;
 595
 596     /* Set content to digest */
 597     rct_cont = BIO_new_mem_buf(os->data, os->length);
 598     if (rct_cont == NULL)
 599         goto err;
 600
 601     /* Add msgSigDigest attribute */
 602
 603     if (!ossl_cms_msgSigDigest_add1(rct_si, si))
 604         goto err;
 605
 606     /* Finalize structure */
 607     if (!CMS_final(cms, rct_cont, NULL, flags))
 608         goto err;
 609
 610     /* Set embedded content */
 611     pos = CMS_get0_content(cms);
 612     if (pos == NULL)
 613         goto err;
 614     *pos = os;
 615
 616     r = 1;
 617
 618  err:
 619     BIO_free(rct_cont);
 620     if (r)
 621         return cms;
 622     CMS_ContentInfo_free(cms);
 623     return NULL;
 624
 625 }
 626
 627 CMS_ContentInfo *CMS_encrypt_ex(STACK_OF(X509) *certs, BIO *data,
 628                                 const EVP_CIPHER *cipher, unsigned int flags,
 629                                 OSSL_LIB_CTX *libctx, const char *propq)
 630 {
 631     CMS_ContentInfo *cms;
 632     int i;
 633     X509 *recip;
 634
 635
 636     cms = (EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)
 637           ? CMS_AuthEnvelopedData_create_ex(cipher, libctx, propq)
 638           : CMS_EnvelopedData_create_ex(cipher, libctx, propq);
 639     if (cms == NULL)
 640         goto merr;
 641     for (i = 0; i < sk_X509_num(certs); i++) {
 642         recip = sk_X509_value(certs, i);
 643         if (!CMS_add1_recipient_cert(cms, recip, flags)) {
 644             ERR_raise(ERR_LIB_CMS, CMS_R_RECIPIENT_ERROR);
 645             goto err;
 646         }
 647     }
 648
 649     if (!(flags & CMS_DETACHED))
 650         CMS_set_detached(cms, 0);
 651
 652     if ((flags & (CMS_STREAM | CMS_PARTIAL))
 653         || CMS_final(cms, data, NULL, flags))
 654         return cms;
 655     else
 656         goto err;
 657
 658  merr:
 659     ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 660  err:
 661     CMS_ContentInfo_free(cms);
 662     return NULL;
 663 }
 664
 665 CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *data,
 666                              const EVP_CIPHER *cipher, unsigned int flags)
 667 {
 668     return CMS_encrypt_ex(certs, data, cipher, flags, NULL, NULL);
 669 }
 670
 671 static int cms_kari_set1_pkey_and_peer(CMS_ContentInfo *cms,
 672                                        CMS_RecipientInfo *ri,
 673                                        EVP_PKEY *pk, X509 *cert, X509 *peer)
 674 {
 675     int i;
 676     STACK_OF(CMS_RecipientEncryptedKey) *reks;
 677     CMS_RecipientEncryptedKey *rek;
 678
 679     reks = CMS_RecipientInfo_kari_get0_reks(ri);
 680     for (i = 0; i < sk_CMS_RecipientEncryptedKey_num(reks); i++) {
 681         int rv;
 682
 683         rek = sk_CMS_RecipientEncryptedKey_value(reks, i);
 684         if (cert != NULL && CMS_RecipientEncryptedKey_cert_cmp(rek, cert))
 685             continue;
 686         CMS_RecipientInfo_kari_set0_pkey_and_peer(ri, pk, peer);
 687         rv = CMS_RecipientInfo_kari_decrypt(cms, ri, rek);
 688         CMS_RecipientInfo_kari_set0_pkey(ri, NULL);
 689         if (rv > 0)
 690             return 1;
 691         return cert == NULL ? 0 : -1;
 692     }
 693     return 0;
 694 }
 695
 696 int CMS_decrypt_set1_pkey(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert)
 697 {
 698      return CMS_decrypt_set1_pkey_and_peer(cms, pk, cert, NULL);
 699 }
 700
 701 int CMS_decrypt_set1_pkey_and_peer(CMS_ContentInfo *cms, EVP_PKEY *pk,
 702                                    X509 *cert, X509 *peer)
 703 {
 704     STACK_OF(CMS_RecipientInfo) *ris;
 705     CMS_RecipientInfo *ri;
 706     int i, r, cms_pkey_ri_type;
 707     int debug = 0, match_ri = 0;
 708
 709     ris = CMS_get0_RecipientInfos(cms);
 710     if (ris != NULL)
 711         debug = ossl_cms_get0_env_enc_content(cms)->debug;
 712
 713     cms_pkey_ri_type = ossl_cms_pkey_get_ri_type(pk);
 714     if (cms_pkey_ri_type == CMS_RECIPINFO_NONE) {
 715          ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 716          return 0;
 717     }
 718
 719     for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
 720         int ri_type;
 721
 722         ri = sk_CMS_RecipientInfo_value(ris, i);
 723         ri_type = CMS_RecipientInfo_type(ri);
 724         if (!ossl_cms_pkey_is_ri_type_supported(pk, ri_type))
 725             continue;
 726         match_ri = 1;
 727         if (ri_type == CMS_RECIPINFO_AGREE) {
 728             r = cms_kari_set1_pkey_and_peer(cms, ri, pk, cert, peer);
 729             if (r > 0)
 730                 return 1;
 731             if (r < 0)
 732                 return 0;
 733         }
 734         /*
 735          * If we have a cert try matching RecipientInfo otherwise try them
 736          * all.
 737          */
 738         else if (cert == NULL|| !CMS_RecipientInfo_ktri_cert_cmp(ri, cert)) {
 739             EVP_PKEY_up_ref(pk);
 740             CMS_RecipientInfo_set0_pkey(ri, pk);
 741             r = CMS_RecipientInfo_decrypt(cms, ri);
 742             CMS_RecipientInfo_set0_pkey(ri, NULL);
 743             if (cert != NULL) {
 744                 /*
 745                  * If not debugging clear any error and return success to
 746                  * avoid leaking of information useful to MMA
 747                  */
 748                 if (!debug) {
 749                     ERR_clear_error();
 750                     return 1;
 751                 }
 752                 if (r > 0)
 753                     return 1;
 754                 ERR_raise(ERR_LIB_CMS, CMS_R_DECRYPT_ERROR);
 755                 return 0;
 756             }
 757             /*
 758              * If no cert and not debugging don't leave loop after first
 759              * successful decrypt. Always attempt to decrypt all recipients
 760              * to avoid leaking timing of a successful decrypt.
 761              */
 762             else if (r > 0 && (debug || cms_pkey_ri_type != CMS_RECIPINFO_TRANS))
 763                 return 1;
 764         }
 765     }
 766     /* If no cert, key transport and not debugging always return success */
 767     if (cert == NULL
 768         && cms_pkey_ri_type == CMS_RECIPINFO_TRANS
 769         && match_ri
 770         && !debug) {
 771         ERR_clear_error();
 772         return 1;
 773     }
 774
 775     ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
 776     return 0;
 777
 778 }
 779
 780 int CMS_decrypt_set1_key(CMS_ContentInfo *cms,
 781                          unsigned char *key, size_t keylen,
 782                          const unsigned char *id, size_t idlen)
 783 {
 784     STACK_OF(CMS_RecipientInfo) *ris;
 785     CMS_RecipientInfo *ri;
 786     int i, r;
 787
 788     ris = CMS_get0_RecipientInfos(cms);
 789     for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
 790         ri = sk_CMS_RecipientInfo_value(ris, i);
 791         if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_KEK)
 792             continue;
 793
 794         /*
 795          * If we have an id try matching RecipientInfo otherwise try them
 796          * all.
 797          */
 798         if (id == NULL || (CMS_RecipientInfo_kekri_id_cmp(ri, id, idlen) == 0)) {
 799             CMS_RecipientInfo_set0_key(ri, key, keylen);
 800             r = CMS_RecipientInfo_decrypt(cms, ri);
 801             CMS_RecipientInfo_set0_key(ri, NULL, 0);
 802             if (r > 0)
 803                 return 1;
 804             if (id != NULL) {
 805                 ERR_raise(ERR_LIB_CMS, CMS_R_DECRYPT_ERROR);
 806                 return 0;
 807             }
 808             ERR_clear_error();
 809         }
 810     }
 811
 812     ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
 813     return 0;
 814
 815 }
 816
 817 int CMS_decrypt_set1_password(CMS_ContentInfo *cms,
 818                               unsigned char *pass, ossl_ssize_t passlen)
 819 {
 820     STACK_OF(CMS_RecipientInfo) *ris;
 821     CMS_RecipientInfo *ri;
 822     int i, r;
 823
 824     ris = CMS_get0_RecipientInfos(cms);
 825     for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
 826         ri = sk_CMS_RecipientInfo_value(ris, i);
 827         if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_PASS)
 828             continue;
 829         CMS_RecipientInfo_set0_password(ri, pass, passlen);
 830         r = CMS_RecipientInfo_decrypt(cms, ri);
 831         CMS_RecipientInfo_set0_password(ri, NULL, 0);
 832         if (r > 0)
 833             return 1;
 834     }
 835
 836     ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
 837     return 0;
 838
 839 }
 840
 841 int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert,
 842                 BIO *dcont, BIO *out, unsigned int flags)
 843 {
 844     int r;
 845     BIO *cont;
 846
 847     int nid = OBJ_obj2nid(CMS_get0_type(cms));
 848
 849     if (nid != NID_pkcs7_enveloped
 850             && nid != NID_id_smime_ct_authEnvelopedData) {
 851         ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_ENVELOPED_DATA);
 852         return 0;
 853     }
 854     if (dcont == NULL && !check_content(cms))
 855         return 0;
 856     if (flags & CMS_DEBUG_DECRYPT)
 857         ossl_cms_get0_env_enc_content(cms)->debug = 1;
 858     else
 859         ossl_cms_get0_env_enc_content(cms)->debug = 0;
 860     if (cert == NULL)
 861         ossl_cms_get0_env_enc_content(cms)->havenocert = 1;
 862     else
 863         ossl_cms_get0_env_enc_content(cms)->havenocert = 0;
 864     if (pk == NULL && cert == NULL && dcont == NULL && out == NULL)
 865         return 1;
 866     if (pk != NULL && !CMS_decrypt_set1_pkey(cms, pk, cert))
 867         return 0;
 868     cont = CMS_dataInit(cms, dcont);
 869     if (cont == NULL)
 870         return 0;
 871     r = cms_copy_content(out, cont, flags);
 872     do_free_upto(cont, dcont);
 873     return r;
 874 }
 875
 876 int CMS_final(CMS_ContentInfo *cms, BIO *data, BIO *dcont, unsigned int flags)
 877 {
 878     BIO *cmsbio;
 879     int ret = 0;
 880
 881     if ((cmsbio = CMS_dataInit(cms, dcont)) == NULL) {
 882         ERR_raise(ERR_LIB_CMS, CMS_R_CMS_LIB);
 883         return 0;
 884     }
 885
 886     if (!SMIME_crlf_copy(data, cmsbio, flags)) {
 887         goto err;
 888     }
 889
 890     (void)BIO_flush(cmsbio);
 891
 892     if (!CMS_dataFinal(cms, cmsbio)) {
 893         ERR_raise(ERR_LIB_CMS, CMS_R_CMS_DATAFINAL_ERROR);
 894         goto err;
 895     }
 896
 897     ret = 1;
 898
 899 err:
 900     do_free_upto(cmsbio, dcont);
 901
 902     return ret;
 903
 904 }
 905
 906 int CMS_final_digest(CMS_ContentInfo *cms,
 907                      const unsigned char *md, unsigned int mdlen,
 908                      BIO *dcont, unsigned int flags)
 909 {
 910     BIO *cmsbio;
 911     int ret = 0;
 912
 913     if ((cmsbio = CMS_dataInit(cms, dcont)) == NULL) {
 914         ERR_raise(ERR_LIB_CMS, CMS_R_CMS_LIB);
 915         return 0;
 916     }
 917
 918     (void)BIO_flush(cmsbio);
 919
 920     if (!ossl_cms_DataFinal(cms, cmsbio, md, mdlen)) {
 921         ERR_raise(ERR_LIB_CMS, CMS_R_CMS_DATAFINAL_ERROR);
 922         goto err;
 923     }
 924     ret = 1;
 925
 926 err:
 927     do_free_upto(cmsbio, dcont);
 928     return ret;
 929 }
 930
 931 #ifdef ZLIB
 932
 933 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 934                    unsigned int flags)
 935 {
 936     BIO *cont;
 937     int r;
 938
 939     if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_id_smime_ct_compressedData) {
 940         ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_COMPRESSED_DATA);
 941         return 0;
 942     }
 943
 944     if (dcont == NULL && !check_content(cms))
 945         return 0;
 946
 947     cont = CMS_dataInit(cms, dcont);
 948     if (cont == NULL)
 949         return 0;
 950     r = cms_copy_content(out, cont, flags);
 951     do_free_upto(cont, dcont);
 952     return r;
 953 }
 954
 955 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 956 {
 957     CMS_ContentInfo *cms;
 958
 959     if (comp_nid <= 0)
 960         comp_nid = NID_zlib_compression;
 961     cms = ossl_cms_CompressedData_create(comp_nid, NULL, NULL);
 962     if (cms == NULL)
 963         return NULL;
 964
 965     if (!(flags & CMS_DETACHED))
 966         CMS_set_detached(cms, 0);
 967
 968     if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
 969         return cms;
 970
 971     CMS_ContentInfo_free(cms);
 972     return NULL;
 973 }
 974
 975 #else
 976
 977 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 978                    unsigned int flags)
 979 {
 980     ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 981     return 0;
 982 }
 983
 984 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 985 {
 986     ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 987     return NULL;
 988 }
 989
 990 #endif