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_CMS_LIB);
  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) *untrusted,
 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_X509_LIB);
 275         goto err;
 276     }
 277     CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 278     if (!X509_STORE_CTX_init(ctx, store, signer, untrusted)) {
 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 /* This strongly overlaps with PKCS7_verify() */
 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     STACK_OF(X509) **si_chains = NULL;
 313     X509 *signer;
 314     int i, scount = 0, ret = 0;
 315     BIO *cmsbio = NULL, *tmpin = NULL, *tmpout = NULL;
 316     int cadesVerify = (flags & CMS_CADES) != 0;
 317     const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
 318
 319     if (dcont == NULL && !check_content(cms))
 320         return 0;
 321     if (dcont != NULL && !(flags & CMS_BINARY)) {
 322         const ASN1_OBJECT *coid = CMS_get0_eContentType(cms);
 323
 324         if (OBJ_obj2nid(coid) == NID_id_ct_asciiTextWithCRLF)
 325             flags |= CMS_ASCIICRLF;
 326     }
 327
 328     /* Attempt to find all signer certificates */
 329
 330     sinfos = CMS_get0_SignerInfos(cms);
 331
 332     if (sk_CMS_SignerInfo_num(sinfos) <= 0) {
 333         ERR_raise(ERR_LIB_CMS, CMS_R_NO_SIGNERS);
 334         goto err;
 335     }
 336
 337     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 338         si = sk_CMS_SignerInfo_value(sinfos, i);
 339         CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 340         if (signer != NULL)
 341             scount++;
 342     }
 343
 344     if (scount != sk_CMS_SignerInfo_num(sinfos))
 345         scount += CMS_set1_signers_certs(cms, certs, flags);
 346
 347     if (scount != sk_CMS_SignerInfo_num(sinfos)) {
 348         ERR_raise(ERR_LIB_CMS, CMS_R_SIGNER_CERTIFICATE_NOT_FOUND);
 349         goto err;
 350     }
 351
 352     /* Attempt to verify all signers certs */
 353     /* at this point scount == sk_CMS_SignerInfo_num(sinfos) */
 354
 355     if ((flags & CMS_NO_SIGNER_CERT_VERIFY) == 0 || cadesVerify) {
 356         if (cadesVerify) {
 357             /* Certificate trust chain is required to check CAdES signature */
 358             si_chains = OPENSSL_zalloc(scount * sizeof(si_chains[0]));
 359             if (si_chains == NULL)
 360                 goto err;
 361         }
 362         cms_certs = CMS_get1_certs(cms);
 363         if (!(flags & CMS_NOCRL))
 364             crls = CMS_get1_crls(cms);
 365         for (i = 0; i < scount; i++) {
 366             si = sk_CMS_SignerInfo_value(sinfos, i);
 367
 368             if (!cms_signerinfo_verify_cert(si, store, cms_certs, crls,
 369                                             si_chains ? &si_chains[i] : NULL,
 370                                             ctx))
 371                 goto err;
 372         }
 373     }
 374
 375     /* Attempt to verify all SignerInfo signed attribute signatures */
 376
 377     if ((flags & CMS_NO_ATTR_VERIFY) == 0 || cadesVerify) {
 378         for (i = 0; i < scount; i++) {
 379             si = sk_CMS_SignerInfo_value(sinfos, i);
 380             if (CMS_signed_get_attr_count(si) < 0)
 381                 continue;
 382             if (CMS_SignerInfo_verify(si) <= 0)
 383                 goto err;
 384             if (cadesVerify) {
 385                 STACK_OF(X509) *si_chain = si_chains ? si_chains[i] : NULL;
 386
 387                 if (ossl_cms_check_signing_certs(si, si_chain) <= 0)
 388                     goto err;
 389             }
 390         }
 391     }
 392
 393     /*
 394      * Performance optimization: if the content is a memory BIO then store
 395      * its contents in a temporary read only memory BIO. This avoids
 396      * potentially large numbers of slow copies of data which will occur when
 397      * reading from a read write memory BIO when signatures are calculated.
 398      */
 399
 400     if (dcont != NULL && (BIO_method_type(dcont) == BIO_TYPE_MEM)) {
 401         char *ptr;
 402         long len;
 403
 404         len = BIO_get_mem_data(dcont, &ptr);
 405         tmpin = (len == 0) ? dcont : BIO_new_mem_buf(ptr, len);
 406         if (tmpin == NULL) {
 407             ERR_raise(ERR_LIB_CMS, ERR_R_BIO_LIB);
 408             goto err2;
 409         }
 410     } else {
 411         tmpin = dcont;
 412     }
 413     /*
 414      * If not binary mode and detached generate digests by *writing* through
 415      * the BIO. That makes it possible to canonicalise the input.
 416      */
 417     if (!(flags & SMIME_BINARY) && dcont) {
 418         /*
 419          * Create output BIO so we can either handle text or to ensure
 420          * included content doesn't override detached content.
 421          */
 422         tmpout = cms_get_text_bio(out, flags);
 423         if (tmpout == NULL) {
 424             ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
 425             goto err;
 426         }
 427         cmsbio = CMS_dataInit(cms, tmpout);
 428         if (cmsbio == NULL)
 429             goto err;
 430         /*
 431          * Don't use SMIME_TEXT for verify: it adds headers and we want to
 432          * remove them.
 433          */
 434         if (!SMIME_crlf_copy(dcont, cmsbio, flags & ~SMIME_TEXT))
 435             goto err;
 436
 437         if (flags & CMS_TEXT) {
 438             if (!SMIME_text(tmpout, out)) {
 439                 ERR_raise(ERR_LIB_CMS, CMS_R_SMIME_TEXT_ERROR);
 440                 goto err;
 441             }
 442         }
 443     } else {
 444         cmsbio = CMS_dataInit(cms, tmpin);
 445         if (cmsbio == NULL)
 446             goto err;
 447
 448         if (!cms_copy_content(out, cmsbio, flags))
 449             goto err;
 450
 451     }
 452     if (!(flags & CMS_NO_CONTENT_VERIFY)) {
 453         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 454             si = sk_CMS_SignerInfo_value(sinfos, i);
 455             if (CMS_SignerInfo_verify_content(si, cmsbio) <= 0) {
 456                 ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_VERIFY_ERROR);
 457                 goto err;
 458             }
 459         }
 460     }
 461
 462     ret = 1;
 463  err:
 464     if (!(flags & SMIME_BINARY) && dcont) {
 465         do_free_upto(cmsbio, tmpout);
 466         if (tmpin != dcont)
 467             BIO_free(tmpin);
 468     } else {
 469         if (dcont && (tmpin == dcont))
 470             do_free_upto(cmsbio, dcont);
 471         else
 472             BIO_free_all(cmsbio);
 473     }
 474
 475     if (out != tmpout)
 476         BIO_free_all(tmpout);
 477
 478  err2:
 479     if (si_chains != NULL) {
 480         for (i = 0; i < scount; ++i)
 481             OSSL_STACK_OF_X509_free(si_chains[i]);
 482         OPENSSL_free(si_chains);
 483     }
 484     OSSL_STACK_OF_X509_free(cms_certs);
 485     sk_X509_CRL_pop_free(crls, X509_CRL_free);
 486
 487     return ret;
 488 }
 489
 490 int CMS_verify_receipt(CMS_ContentInfo *rcms, CMS_ContentInfo *ocms,
 491                        STACK_OF(X509) *certs,
 492                        X509_STORE *store, unsigned int flags)
 493 {
 494     int r;
 495
 496     flags &= ~(CMS_DETACHED | CMS_TEXT);
 497     r = CMS_verify(rcms, certs, store, NULL, NULL, flags);
 498     if (r <= 0)
 499         return r;
 500     return ossl_cms_Receipt_verify(rcms, ocms);
 501 }
 502
 503 CMS_ContentInfo *CMS_sign_ex(X509 *signcert, EVP_PKEY *pkey,
 504                              STACK_OF(X509) *certs, BIO *data,
 505                              unsigned int flags, OSSL_LIB_CTX *libctx,
 506                              const char *propq)
 507 {
 508     CMS_ContentInfo *cms;
 509     int i;
 510
 511     cms = CMS_ContentInfo_new_ex(libctx, propq);
 512     if (cms == NULL || !CMS_SignedData_init(cms)) {
 513         ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
 514         goto err;
 515     }
 516     if (flags & CMS_ASCIICRLF
 517         && !CMS_set1_eContentType(cms,
 518                                   OBJ_nid2obj(NID_id_ct_asciiTextWithCRLF))) {
 519         ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
 520         goto err;
 521     }
 522
 523     if (pkey != NULL && !CMS_add1_signer(cms, signcert, pkey, NULL, flags)) {
 524         ERR_raise(ERR_LIB_CMS, CMS_R_ADD_SIGNER_ERROR);
 525         goto err;
 526     }
 527
 528     for (i = 0; i < sk_X509_num(certs); i++) {
 529         X509 *x = sk_X509_value(certs, i);
 530
 531         if (!CMS_add1_cert(cms, x)) {
 532             ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
 533             goto err;
 534         }
 535     }
 536
 537     if (!(flags & CMS_DETACHED))
 538         CMS_set_detached(cms, 0);
 539
 540     if ((flags & (CMS_STREAM | CMS_PARTIAL))
 541         || CMS_final(cms, data, NULL, flags))
 542         return cms;
 543     else
 544         goto err;
 545
 546  err:
 547     CMS_ContentInfo_free(cms);
 548     return NULL;
 549 }
 550
 551 CMS_ContentInfo *CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
 552                           BIO *data, unsigned int flags)
 553 {
 554     return CMS_sign_ex(signcert, pkey, certs, data, flags, NULL, NULL);
 555 }
 556
 557 CMS_ContentInfo *CMS_sign_receipt(CMS_SignerInfo *si,
 558                                   X509 *signcert, EVP_PKEY *pkey,
 559                                   STACK_OF(X509) *certs, unsigned int flags)
 560 {
 561     CMS_SignerInfo *rct_si;
 562     CMS_ContentInfo *cms = NULL;
 563     ASN1_OCTET_STRING **pos, *os;
 564     BIO *rct_cont = NULL;
 565     int r = 0;
 566     const CMS_CTX *ctx = si->cms_ctx;
 567
 568     flags &= ~(CMS_STREAM | CMS_TEXT);
 569     /* Not really detached but avoids content being allocated */
 570     flags |= CMS_PARTIAL | CMS_BINARY | CMS_DETACHED;
 571     if (pkey == NULL || signcert == NULL) {
 572         ERR_raise(ERR_LIB_CMS, CMS_R_NO_KEY_OR_CERT);
 573         return NULL;
 574     }
 575
 576     /* Initialize signed data */
 577
 578     cms = CMS_sign_ex(NULL, NULL, certs, NULL, flags,
 579                       ossl_cms_ctx_get0_libctx(ctx),
 580                       ossl_cms_ctx_get0_propq(ctx));
 581     if (cms == NULL)
 582         goto err;
 583
 584     /* Set inner content type to signed receipt */
 585     if (!CMS_set1_eContentType(cms, OBJ_nid2obj(NID_id_smime_ct_receipt)))
 586         goto err;
 587
 588     rct_si = CMS_add1_signer(cms, signcert, pkey, NULL, flags);
 589     if (!rct_si) {
 590         ERR_raise(ERR_LIB_CMS, CMS_R_ADD_SIGNER_ERROR);
 591         goto err;
 592     }
 593
 594     os = ossl_cms_encode_Receipt(si);
 595     if (os == NULL)
 596         goto err;
 597
 598     /* Set content to digest */
 599     rct_cont = BIO_new_mem_buf(os->data, os->length);
 600     if (rct_cont == NULL)
 601         goto err;
 602
 603     /* Add msgSigDigest attribute */
 604
 605     if (!ossl_cms_msgSigDigest_add1(rct_si, si))
 606         goto err;
 607
 608     /* Finalize structure */
 609     if (!CMS_final(cms, rct_cont, NULL, flags))
 610         goto err;
 611
 612     /* Set embedded content */
 613     pos = CMS_get0_content(cms);
 614     if (pos == NULL)
 615         goto err;
 616     *pos = os;
 617
 618     r = 1;
 619
 620  err:
 621     BIO_free(rct_cont);
 622     if (r)
 623         return cms;
 624     CMS_ContentInfo_free(cms);
 625     return NULL;
 626
 627 }
 628
 629 CMS_ContentInfo *CMS_encrypt_ex(STACK_OF(X509) *certs, BIO *data,
 630                                 const EVP_CIPHER *cipher, unsigned int flags,
 631                                 OSSL_LIB_CTX *libctx, const char *propq)
 632 {
 633     CMS_ContentInfo *cms;
 634     int i;
 635     X509 *recip;
 636
 637
 638     cms = (EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)
 639           ? CMS_AuthEnvelopedData_create_ex(cipher, libctx, propq)
 640           : CMS_EnvelopedData_create_ex(cipher, libctx, propq);
 641     if (cms == NULL) {
 642         ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
 643         goto err;
 644     }
 645     for (i = 0; i < sk_X509_num(certs); i++) {
 646         recip = sk_X509_value(certs, i);
 647         if (!CMS_add1_recipient_cert(cms, recip, flags)) {
 648             ERR_raise(ERR_LIB_CMS, CMS_R_RECIPIENT_ERROR);
 649             goto err;
 650         }
 651     }
 652
 653     if (!(flags & CMS_DETACHED))
 654         CMS_set_detached(cms, 0);
 655
 656     if ((flags & (CMS_STREAM | CMS_PARTIAL))
 657         || CMS_final(cms, data, NULL, flags))
 658         return cms;
 659     else
 660         ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
 661
 662  err:
 663     CMS_ContentInfo_free(cms);
 664     return NULL;
 665 }
 666
 667 CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *data,
 668                              const EVP_CIPHER *cipher, unsigned int flags)
 669 {
 670     return CMS_encrypt_ex(certs, data, cipher, flags, NULL, NULL);
 671 }
 672
 673 static int cms_kari_set1_pkey_and_peer(CMS_ContentInfo *cms,
 674                                        CMS_RecipientInfo *ri,
 675                                        EVP_PKEY *pk, X509 *cert, X509 *peer)
 676 {
 677     int i;
 678     STACK_OF(CMS_RecipientEncryptedKey) *reks;
 679     CMS_RecipientEncryptedKey *rek;
 680
 681     reks = CMS_RecipientInfo_kari_get0_reks(ri);
 682     for (i = 0; i < sk_CMS_RecipientEncryptedKey_num(reks); i++) {
 683         int rv;
 684
 685         rek = sk_CMS_RecipientEncryptedKey_value(reks, i);
 686         if (cert != NULL && CMS_RecipientEncryptedKey_cert_cmp(rek, cert))
 687             continue;
 688         CMS_RecipientInfo_kari_set0_pkey_and_peer(ri, pk, peer);
 689         rv = CMS_RecipientInfo_kari_decrypt(cms, ri, rek);
 690         CMS_RecipientInfo_kari_set0_pkey(ri, NULL);
 691         if (rv > 0)
 692             return 1;
 693         return cert == NULL ? 0 : -1;
 694     }
 695     return 0;
 696 }
 697
 698 int CMS_decrypt_set1_pkey(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert)
 699 {
 700      return CMS_decrypt_set1_pkey_and_peer(cms, pk, cert, NULL);
 701 }
 702
 703 int CMS_decrypt_set1_pkey_and_peer(CMS_ContentInfo *cms, EVP_PKEY *pk,
 704                                    X509 *cert, X509 *peer)
 705 {
 706     STACK_OF(CMS_RecipientInfo) *ris = CMS_get0_RecipientInfos(cms);
 707     CMS_RecipientInfo *ri;
 708     int i, r, cms_pkey_ri_type;
 709     int debug = 0, match_ri = 0;
 710     CMS_EncryptedContentInfo *ec = ossl_cms_get0_env_enc_content(cms);
 711
 712     /* Prevent mem leak on earlier CMS_decrypt_set1_{pkey_and_peer,password} */
 713     if (ec != NULL) {
 714         OPENSSL_clear_free(ec->key, ec->keylen);
 715         ec->key = NULL;
 716         ec->keylen = 0;
 717     }
 718
 719     if (ris != NULL && ec != NULL)
 720         debug = ec->debug;
 721
 722     cms_pkey_ri_type = ossl_cms_pkey_get_ri_type(pk);
 723     if (cms_pkey_ri_type == CMS_RECIPINFO_NONE) {
 724          ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 725          return 0;
 726     }
 727
 728     for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
 729         int ri_type;
 730
 731         ri = sk_CMS_RecipientInfo_value(ris, i);
 732         ri_type = CMS_RecipientInfo_type(ri);
 733         if (!ossl_cms_pkey_is_ri_type_supported(pk, ri_type))
 734             continue;
 735         match_ri = 1;
 736         if (ri_type == CMS_RECIPINFO_AGREE) {
 737             r = cms_kari_set1_pkey_and_peer(cms, ri, pk, cert, peer);
 738             if (r > 0)
 739                 return 1;
 740             if (r < 0)
 741                 return 0;
 742         }
 743         /* If we have a cert, try matching RecipientInfo, else try them all */
 744         else if (cert == NULL || !CMS_RecipientInfo_ktri_cert_cmp(ri, cert)) {
 745             EVP_PKEY_up_ref(pk);
 746             CMS_RecipientInfo_set0_pkey(ri, pk);
 747             r = CMS_RecipientInfo_decrypt(cms, ri);
 748             CMS_RecipientInfo_set0_pkey(ri, NULL);
 749             if (cert != NULL) {
 750                 /*
 751                  * If not debugging clear any error and return success to
 752                  * avoid leaking of information useful to MMA
 753                  */
 754                 if (!debug) {
 755                     ERR_clear_error();
 756                     return 1;
 757                 }
 758                 if (r > 0)
 759                     return 1;
 760                 ERR_raise(ERR_LIB_CMS, CMS_R_DECRYPT_ERROR);
 761                 return 0;
 762             }
 763             /*
 764              * If no cert and not debugging don't leave loop after first
 765              * successful decrypt. Always attempt to decrypt all recipients
 766              * to avoid leaking timing of a successful decrypt.
 767              */
 768             else if (r > 0 && (debug || cms_pkey_ri_type != CMS_RECIPINFO_TRANS))
 769                 return 1;
 770         }
 771     }
 772     /* If no cert, key transport and not debugging always return success */
 773     if (cert == NULL
 774         && cms_pkey_ri_type == CMS_RECIPINFO_TRANS
 775         && match_ri
 776         && !debug) {
 777         ERR_clear_error();
 778         return 1;
 779     }
 780
 781     if (!match_ri)
 782         ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
 783     return 0;
 784
 785 }
 786
 787 int CMS_decrypt_set1_key(CMS_ContentInfo *cms,
 788                          unsigned char *key, size_t keylen,
 789                          const unsigned char *id, size_t idlen)
 790 {
 791     STACK_OF(CMS_RecipientInfo) *ris;
 792     CMS_RecipientInfo *ri;
 793     int i, r, match_ri = 0;
 794
 795     ris = CMS_get0_RecipientInfos(cms);
 796     for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
 797         ri = sk_CMS_RecipientInfo_value(ris, i);
 798         if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_KEK)
 799             continue;
 800
 801         /* If we have an id, try matching RecipientInfo, else try them all */
 802         if (id == NULL
 803                 || (CMS_RecipientInfo_kekri_id_cmp(ri, id, idlen) == 0)) {
 804             match_ri = 1;
 805             CMS_RecipientInfo_set0_key(ri, key, keylen);
 806             r = CMS_RecipientInfo_decrypt(cms, ri);
 807             CMS_RecipientInfo_set0_key(ri, NULL, 0);
 808             if (r > 0)
 809                 return 1;
 810             if (id != NULL) {
 811                 ERR_raise(ERR_LIB_CMS, CMS_R_DECRYPT_ERROR);
 812                 return 0;
 813             }
 814             ERR_clear_error();
 815         }
 816     }
 817
 818     if (!match_ri)
 819         ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
 820     return 0;
 821
 822 }
 823
 824 int CMS_decrypt_set1_password(CMS_ContentInfo *cms,
 825                               unsigned char *pass, ossl_ssize_t passlen)
 826 {
 827     STACK_OF(CMS_RecipientInfo) *ris = CMS_get0_RecipientInfos(cms);
 828     CMS_RecipientInfo *ri;
 829     int i, r, match_ri = 0;
 830     CMS_EncryptedContentInfo *ec = ossl_cms_get0_env_enc_content(cms);
 831
 832     /* Prevent mem leak on earlier CMS_decrypt_set1_{pkey_and_peer,password} */
 833     if (ec != NULL) {
 834         OPENSSL_clear_free(ec->key, ec->keylen);
 835         ec->key = NULL;
 836         ec->keylen = 0;
 837     }
 838
 839     for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
 840         ri = sk_CMS_RecipientInfo_value(ris, i);
 841         if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_PASS)
 842             continue;
 843
 844         /* Must try each PasswordRecipientInfo */
 845         match_ri = 1;
 846         CMS_RecipientInfo_set0_password(ri, pass, passlen);
 847         r = CMS_RecipientInfo_decrypt(cms, ri);
 848         CMS_RecipientInfo_set0_password(ri, NULL, 0);
 849         if (r > 0)
 850             return 1;
 851     }
 852
 853     if (!match_ri)
 854         ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
 855     return 0;
 856
 857 }
 858
 859 int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert,
 860                 BIO *dcont, BIO *out, unsigned int flags)
 861 {
 862     int r;
 863     BIO *cont;
 864     CMS_EncryptedContentInfo *ec;
 865     int nid = OBJ_obj2nid(CMS_get0_type(cms));
 866
 867     if (nid != NID_pkcs7_enveloped
 868             && nid != NID_id_smime_ct_authEnvelopedData) {
 869         ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_ENVELOPED_DATA);
 870         return 0;
 871     }
 872     if (dcont == NULL && !check_content(cms))
 873         return 0;
 874     ec = ossl_cms_get0_env_enc_content(cms);
 875     ec->debug = (flags & CMS_DEBUG_DECRYPT) != 0;
 876     ec->havenocert = cert == NULL;
 877     if (pk == NULL && cert == NULL && dcont == NULL && out == NULL)
 878         return 1;
 879     if (pk != NULL && !CMS_decrypt_set1_pkey(cms, pk, cert))
 880         return 0;
 881     cont = CMS_dataInit(cms, dcont);
 882     if (cont == NULL)
 883         return 0;
 884     r = cms_copy_content(out, cont, flags);
 885     do_free_upto(cont, dcont);
 886     return r;
 887 }
 888
 889 int CMS_final(CMS_ContentInfo *cms, BIO *data, BIO *dcont, unsigned int flags)
 890 {
 891     BIO *cmsbio;
 892     int ret = 0;
 893
 894     if ((cmsbio = CMS_dataInit(cms, dcont)) == NULL) {
 895         ERR_raise(ERR_LIB_CMS, CMS_R_CMS_LIB);
 896         return 0;
 897     }
 898
 899     if (!SMIME_crlf_copy(data, cmsbio, flags)) {
 900         goto err;
 901     }
 902
 903     (void)BIO_flush(cmsbio);
 904
 905     if (!CMS_dataFinal(cms, cmsbio)) {
 906         ERR_raise(ERR_LIB_CMS, CMS_R_CMS_DATAFINAL_ERROR);
 907         goto err;
 908     }
 909
 910     ret = 1;
 911
 912 err:
 913     do_free_upto(cmsbio, dcont);
 914
 915     return ret;
 916
 917 }
 918
 919 int CMS_final_digest(CMS_ContentInfo *cms,
 920                      const unsigned char *md, unsigned int mdlen,
 921                      BIO *dcont, unsigned int flags)
 922 {
 923     BIO *cmsbio;
 924     int ret = 0;
 925
 926     if ((cmsbio = CMS_dataInit(cms, dcont)) == NULL) {
 927         ERR_raise(ERR_LIB_CMS, CMS_R_CMS_LIB);
 928         return 0;
 929     }
 930
 931     (void)BIO_flush(cmsbio);
 932
 933     if (!ossl_cms_DataFinal(cms, cmsbio, md, mdlen)) {
 934         ERR_raise(ERR_LIB_CMS, CMS_R_CMS_DATAFINAL_ERROR);
 935         goto err;
 936     }
 937     ret = 1;
 938
 939 err:
 940     do_free_upto(cmsbio, dcont);
 941     return ret;
 942 }
 943
 944 #ifndef OPENSSL_NO_ZLIB
 945
 946 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 947                    unsigned int flags)
 948 {
 949     BIO *cont;
 950     int r;
 951
 952     if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_id_smime_ct_compressedData) {
 953         ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_COMPRESSED_DATA);
 954         return 0;
 955     }
 956
 957     if (dcont == NULL && !check_content(cms))
 958         return 0;
 959
 960     cont = CMS_dataInit(cms, dcont);
 961     if (cont == NULL)
 962         return 0;
 963     r = cms_copy_content(out, cont, flags);
 964     do_free_upto(cont, dcont);
 965     return r;
 966 }
 967
 968 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 969 {
 970     CMS_ContentInfo *cms;
 971
 972     if (comp_nid <= 0)
 973         comp_nid = NID_zlib_compression;
 974     cms = ossl_cms_CompressedData_create(comp_nid, NULL, NULL);
 975     if (cms == NULL)
 976         return NULL;
 977
 978     if (!(flags & CMS_DETACHED))
 979         CMS_set_detached(cms, 0);
 980
 981     if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
 982         return cms;
 983
 984     CMS_ContentInfo_free(cms);
 985     return NULL;
 986 }
 987
 988 #else
 989
 990 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 991                    unsigned int flags)
 992 {
 993     ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 994     return 0;
 995 }
 996
 997 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 998 {
 999     ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1000     return NULL;
1001 }
1002
1003 #endif