crypto/cms/cms_smime.c

   1 /*
   2  * Copyright 2008-2023 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         goto err;
 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  err:
 249     CMS_ContentInfo_free(cms);
 250     return NULL;
 251 }
 252
 253 CMS_ContentInfo *CMS_EncryptedData_encrypt(BIO *in, const EVP_CIPHER *cipher,
 254                                            const unsigned char *key,
 255                                            size_t keylen, unsigned int flags)
 256 {
 257     return CMS_EncryptedData_encrypt_ex(in, cipher, key, keylen, flags, NULL,
 258                                         NULL);
 259 }
 260
 261 static int cms_signerinfo_verify_cert(CMS_SignerInfo *si,
 262                                       X509_STORE *store,
 263                                       STACK_OF(X509) *untrusted,
 264                                       STACK_OF(X509_CRL) *crls,
 265                                       STACK_OF(X509) **chain,
 266                                       const CMS_CTX *cms_ctx)
 267 {
 268     X509_STORE_CTX *ctx;
 269     X509 *signer;
 270     int i, j, r = 0;
 271
 272     ctx = X509_STORE_CTX_new_ex(ossl_cms_ctx_get0_libctx(cms_ctx),
 273                                 ossl_cms_ctx_get0_propq(cms_ctx));
 274     if (ctx == NULL) {
 275         ERR_raise(ERR_LIB_CMS, ERR_R_X509_LIB);
 276         goto err;
 277     }
 278     CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 279     if (!X509_STORE_CTX_init(ctx, store, signer, untrusted)) {
 280         ERR_raise(ERR_LIB_CMS, CMS_R_STORE_INIT_ERROR);
 281         goto err;
 282     }
 283     X509_STORE_CTX_set_default(ctx, "smime_sign");
 284     if (crls != NULL)
 285         X509_STORE_CTX_set0_crls(ctx, crls);
 286
 287     i = X509_verify_cert(ctx);
 288     if (i <= 0) {
 289         j = X509_STORE_CTX_get_error(ctx);
 290         ERR_raise_data(ERR_LIB_CMS, CMS_R_CERTIFICATE_VERIFY_ERROR,
 291                        "Verify error: %s", X509_verify_cert_error_string(j));
 292         goto err;
 293     }
 294     r = 1;
 295
 296     /* also send back the trust chain when required */
 297     if (chain != NULL)
 298         *chain = X509_STORE_CTX_get1_chain(ctx);
 299  err:
 300     X509_STORE_CTX_free(ctx);
 301     return r;
 302
 303 }
 304
 305 /* This strongly overlaps with PKCS7_verify() */
 306 int CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs,
 307                X509_STORE *store, BIO *dcont, BIO *out, unsigned int flags)
 308 {
 309     CMS_SignerInfo *si;
 310     STACK_OF(CMS_SignerInfo) *sinfos;
 311     STACK_OF(X509) *cms_certs = NULL;
 312     STACK_OF(X509_CRL) *crls = NULL;
 313     STACK_OF(X509) **si_chains = NULL;
 314     X509 *signer;
 315     int i, scount = 0, ret = 0;
 316     BIO *cmsbio = NULL, *tmpin = NULL, *tmpout = NULL;
 317     int cadesVerify = (flags & CMS_CADES) != 0;
 318     const CMS_CTX *ctx = ossl_cms_get0_cmsctx(cms);
 319
 320     if (dcont == NULL && !check_content(cms))
 321         return 0;
 322     if (dcont != NULL && !(flags & CMS_BINARY)) {
 323         const ASN1_OBJECT *coid = CMS_get0_eContentType(cms);
 324
 325         if (OBJ_obj2nid(coid) == NID_id_ct_asciiTextWithCRLF)
 326             flags |= CMS_ASCIICRLF;
 327     }
 328
 329     /* Attempt to find all signer certificates */
 330
 331     sinfos = CMS_get0_SignerInfos(cms);
 332
 333     if (sk_CMS_SignerInfo_num(sinfos) <= 0) {
 334         ERR_raise(ERR_LIB_CMS, CMS_R_NO_SIGNERS);
 335         goto err;
 336     }
 337
 338     for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
 339         si = sk_CMS_SignerInfo_value(sinfos, i);
 340         CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 341         if (signer != NULL)
 342             scount++;
 343     }
 344
 345     if (scount != sk_CMS_SignerInfo_num(sinfos))
 346         scount += CMS_set1_signers_certs(cms, certs, flags);
 347
 348     if (scount != sk_CMS_SignerInfo_num(sinfos)) {
 349         ERR_raise(ERR_LIB_CMS, CMS_R_SIGNER_CERTIFICATE_NOT_FOUND);
 350         goto err;
 351     }
 352
 353     /* Attempt to verify all signers certs */
 354     /* at this point scount == sk_CMS_SignerInfo_num(sinfos) */
 355
 356     if ((flags & CMS_NO_SIGNER_CERT_VERIFY) == 0 || cadesVerify) {
 357         if (cadesVerify) {
 358             /* Certificate trust chain is required to check CAdES signature */
 359             si_chains = OPENSSL_zalloc(scount * sizeof(si_chains[0]));
 360             if (si_chains == NULL)
 361                 goto err;
 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_BIO_LIB);
 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_CMS_LIB);
 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         ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
 515         goto err;
 516     }
 517     if (flags & CMS_ASCIICRLF
 518         && !CMS_set1_eContentType(cms,
 519                                   OBJ_nid2obj(NID_id_ct_asciiTextWithCRLF))) {
 520         ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
 521         goto err;
 522     }
 523
 524     if (pkey != NULL && !CMS_add1_signer(cms, signcert, pkey, NULL, flags)) {
 525         ERR_raise(ERR_LIB_CMS, CMS_R_ADD_SIGNER_ERROR);
 526         goto err;
 527     }
 528
 529     for (i = 0; i < sk_X509_num(certs); i++) {
 530         X509 *x = sk_X509_value(certs, i);
 531
 532         if (!CMS_add1_cert(cms, x)) {
 533             ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
 534             goto err;
 535         }
 536     }
 537
 538     if (!(flags & CMS_DETACHED))
 539         CMS_set_detached(cms, 0);
 540
 541     if ((flags & (CMS_STREAM | CMS_PARTIAL))
 542         || CMS_final(cms, data, NULL, flags))
 543         return cms;
 544     else
 545         goto err;
 546
 547  err:
 548     CMS_ContentInfo_free(cms);
 549     return NULL;
 550 }
 551
 552 CMS_ContentInfo *CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
 553                           BIO *data, unsigned int flags)
 554 {
 555     return CMS_sign_ex(signcert, pkey, certs, data, flags, NULL, NULL);
 556 }
 557
 558 CMS_ContentInfo *CMS_sign_receipt(CMS_SignerInfo *si,
 559                                   X509 *signcert, EVP_PKEY *pkey,
 560                                   STACK_OF(X509) *certs, unsigned int flags)
 561 {
 562     CMS_SignerInfo *rct_si;
 563     CMS_ContentInfo *cms = NULL;
 564     ASN1_OCTET_STRING **pos, *os = NULL;
 565     BIO *rct_cont = NULL;
 566     int r = 0;
 567     const CMS_CTX *ctx = si->cms_ctx;
 568
 569     flags &= ~(CMS_STREAM | CMS_TEXT);
 570     /* Not really detached but avoids content being allocated */
 571     flags |= CMS_PARTIAL | CMS_BINARY | CMS_DETACHED;
 572     if (pkey == NULL || signcert == NULL) {
 573         ERR_raise(ERR_LIB_CMS, CMS_R_NO_KEY_OR_CERT);
 574         return NULL;
 575     }
 576
 577     /* Initialize signed data */
 578
 579     cms = CMS_sign_ex(NULL, NULL, certs, NULL, flags,
 580                       ossl_cms_ctx_get0_libctx(ctx),
 581                       ossl_cms_ctx_get0_propq(ctx));
 582     if (cms == NULL)
 583         goto err;
 584
 585     /* Set inner content type to signed receipt */
 586     if (!CMS_set1_eContentType(cms, OBJ_nid2obj(NID_id_smime_ct_receipt)))
 587         goto err;
 588
 589     rct_si = CMS_add1_signer(cms, signcert, pkey, NULL, flags);
 590     if (!rct_si) {
 591         ERR_raise(ERR_LIB_CMS, CMS_R_ADD_SIGNER_ERROR);
 592         goto err;
 593     }
 594
 595     os = ossl_cms_encode_Receipt(si);
 596     if (os == NULL)
 597         goto err;
 598
 599     /* Set content to digest */
 600     rct_cont = BIO_new_mem_buf(os->data, os->length);
 601     if (rct_cont == NULL)
 602         goto err;
 603
 604     /* Add msgSigDigest attribute */
 605
 606     if (!ossl_cms_msgSigDigest_add1(rct_si, si))
 607         goto err;
 608
 609     /* Finalize structure */
 610     if (!CMS_final(cms, rct_cont, NULL, flags))
 611         goto err;
 612
 613     /* Set embedded content */
 614     pos = CMS_get0_content(cms);
 615     if (pos == NULL)
 616         goto err;
 617     *pos = os;
 618
 619     r = 1;
 620
 621  err:
 622     BIO_free(rct_cont);
 623     if (r)
 624         return cms;
 625     CMS_ContentInfo_free(cms);
 626     ASN1_OCTET_STRING_free(os);
 627     return NULL;
 628
 629 }
 630
 631 CMS_ContentInfo *CMS_encrypt_ex(STACK_OF(X509) *certs, BIO *data,
 632                                 const EVP_CIPHER *cipher, unsigned int flags,
 633                                 OSSL_LIB_CTX *libctx, const char *propq)
 634 {
 635     CMS_ContentInfo *cms;
 636     int i;
 637     X509 *recip;
 638
 639
 640     cms = (EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)
 641           ? CMS_AuthEnvelopedData_create_ex(cipher, libctx, propq)
 642           : CMS_EnvelopedData_create_ex(cipher, libctx, propq);
 643     if (cms == NULL) {
 644         ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
 645         goto err;
 646     }
 647     for (i = 0; i < sk_X509_num(certs); i++) {
 648         recip = sk_X509_value(certs, i);
 649         if (!CMS_add1_recipient_cert(cms, recip, flags)) {
 650             ERR_raise(ERR_LIB_CMS, CMS_R_RECIPIENT_ERROR);
 651             goto err;
 652         }
 653     }
 654
 655     if (!(flags & CMS_DETACHED))
 656         CMS_set_detached(cms, 0);
 657
 658     if ((flags & (CMS_STREAM | CMS_PARTIAL))
 659         || CMS_final(cms, data, NULL, flags))
 660         return cms;
 661     else
 662         ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
 663
 664  err:
 665     CMS_ContentInfo_free(cms);
 666     return NULL;
 667 }
 668
 669 CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *data,
 670                              const EVP_CIPHER *cipher, unsigned int flags)
 671 {
 672     return CMS_encrypt_ex(certs, data, cipher, flags, NULL, NULL);
 673 }
 674
 675 static int cms_kari_set1_pkey_and_peer(CMS_ContentInfo *cms,
 676                                        CMS_RecipientInfo *ri,
 677                                        EVP_PKEY *pk, X509 *cert, X509 *peer)
 678 {
 679     int i;
 680     STACK_OF(CMS_RecipientEncryptedKey) *reks;
 681     CMS_RecipientEncryptedKey *rek;
 682
 683     reks = CMS_RecipientInfo_kari_get0_reks(ri);
 684     for (i = 0; i < sk_CMS_RecipientEncryptedKey_num(reks); i++) {
 685         int rv;
 686
 687         rek = sk_CMS_RecipientEncryptedKey_value(reks, i);
 688         if (cert != NULL && CMS_RecipientEncryptedKey_cert_cmp(rek, cert))
 689             continue;
 690         CMS_RecipientInfo_kari_set0_pkey_and_peer(ri, pk, peer);
 691         rv = CMS_RecipientInfo_kari_decrypt(cms, ri, rek);
 692         CMS_RecipientInfo_kari_set0_pkey(ri, NULL);
 693         if (rv > 0)
 694             return 1;
 695         return cert == NULL ? 0 : -1;
 696     }
 697     return 0;
 698 }
 699
 700 int CMS_decrypt_set1_pkey(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert)
 701 {
 702      return CMS_decrypt_set1_pkey_and_peer(cms, pk, cert, NULL);
 703 }
 704
 705 int CMS_decrypt_set1_pkey_and_peer(CMS_ContentInfo *cms, EVP_PKEY *pk,
 706                                    X509 *cert, X509 *peer)
 707 {
 708     STACK_OF(CMS_RecipientInfo) *ris = CMS_get0_RecipientInfos(cms);
 709     CMS_RecipientInfo *ri;
 710     int i, r, cms_pkey_ri_type;
 711     int debug = 0, match_ri = 0;
 712     CMS_EncryptedContentInfo *ec = ossl_cms_get0_env_enc_content(cms);
 713
 714     /* Prevent mem leak on earlier CMS_decrypt_set1_{pkey_and_peer,password} */
 715     if (ec != NULL) {
 716         OPENSSL_clear_free(ec->key, ec->keylen);
 717         ec->key = NULL;
 718         ec->keylen = 0;
 719     }
 720
 721     if (ris != NULL && ec != NULL)
 722         debug = ec->debug;
 723
 724     cms_pkey_ri_type = ossl_cms_pkey_get_ri_type(pk);
 725     if (cms_pkey_ri_type == CMS_RECIPINFO_NONE) {
 726          ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
 727          return 0;
 728     }
 729
 730     for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
 731         int ri_type;
 732
 733         ri = sk_CMS_RecipientInfo_value(ris, i);
 734         ri_type = CMS_RecipientInfo_type(ri);
 735         if (!ossl_cms_pkey_is_ri_type_supported(pk, ri_type))
 736             continue;
 737         match_ri = 1;
 738         if (ri_type == CMS_RECIPINFO_AGREE) {
 739             r = cms_kari_set1_pkey_and_peer(cms, ri, pk, cert, peer);
 740             if (r > 0)
 741                 return 1;
 742             if (r < 0)
 743                 return 0;
 744         }
 745         /* If we have a cert, try matching RecipientInfo, else try them all */
 746         else if (cert == NULL || !CMS_RecipientInfo_ktri_cert_cmp(ri, cert)) {
 747             EVP_PKEY_up_ref(pk);
 748             CMS_RecipientInfo_set0_pkey(ri, pk);
 749             r = CMS_RecipientInfo_decrypt(cms, ri);
 750             CMS_RecipientInfo_set0_pkey(ri, NULL);
 751             if (cert != NULL) {
 752                 /*
 753                  * If not debugging clear any error and return success to
 754                  * avoid leaking of information useful to MMA
 755                  */
 756                 if (!debug) {
 757                     ERR_clear_error();
 758                     return 1;
 759                 }
 760                 if (r > 0)
 761                     return 1;
 762                 ERR_raise(ERR_LIB_CMS, CMS_R_DECRYPT_ERROR);
 763                 return 0;
 764             }
 765             /*
 766              * If no cert and not debugging don't leave loop after first
 767              * successful decrypt. Always attempt to decrypt all recipients
 768              * to avoid leaking timing of a successful decrypt.
 769              */
 770             else if (r > 0 && (debug || cms_pkey_ri_type != CMS_RECIPINFO_TRANS))
 771                 return 1;
 772         }
 773     }
 774     /* If no cert, key transport and not debugging always return success */
 775     if (cert == NULL
 776         && cms_pkey_ri_type == CMS_RECIPINFO_TRANS
 777         && match_ri
 778         && !debug) {
 779         ERR_clear_error();
 780         return 1;
 781     }
 782
 783     if (!match_ri)
 784         ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
 785     return 0;
 786
 787 }
 788
 789 int CMS_decrypt_set1_key(CMS_ContentInfo *cms,
 790                          unsigned char *key, size_t keylen,
 791                          const unsigned char *id, size_t idlen)
 792 {
 793     STACK_OF(CMS_RecipientInfo) *ris;
 794     CMS_RecipientInfo *ri;
 795     int i, r, match_ri = 0;
 796
 797     ris = CMS_get0_RecipientInfos(cms);
 798     for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
 799         ri = sk_CMS_RecipientInfo_value(ris, i);
 800         if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_KEK)
 801             continue;
 802
 803         /* If we have an id, try matching RecipientInfo, else try them all */
 804         if (id == NULL
 805                 || (CMS_RecipientInfo_kekri_id_cmp(ri, id, idlen) == 0)) {
 806             match_ri = 1;
 807             CMS_RecipientInfo_set0_key(ri, key, keylen);
 808             r = CMS_RecipientInfo_decrypt(cms, ri);
 809             CMS_RecipientInfo_set0_key(ri, NULL, 0);
 810             if (r > 0)
 811                 return 1;
 812             if (id != NULL) {
 813                 ERR_raise(ERR_LIB_CMS, CMS_R_DECRYPT_ERROR);
 814                 return 0;
 815             }
 816             ERR_clear_error();
 817         }
 818     }
 819
 820     if (!match_ri)
 821         ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
 822     return 0;
 823
 824 }
 825
 826 int CMS_decrypt_set1_password(CMS_ContentInfo *cms,
 827                               unsigned char *pass, ossl_ssize_t passlen)
 828 {
 829     STACK_OF(CMS_RecipientInfo) *ris = CMS_get0_RecipientInfos(cms);
 830     CMS_RecipientInfo *ri;
 831     int i, r, match_ri = 0;
 832     CMS_EncryptedContentInfo *ec = ossl_cms_get0_env_enc_content(cms);
 833
 834     /* Prevent mem leak on earlier CMS_decrypt_set1_{pkey_and_peer,password} */
 835     if (ec != NULL) {
 836         OPENSSL_clear_free(ec->key, ec->keylen);
 837         ec->key = NULL;
 838         ec->keylen = 0;
 839     }
 840
 841     for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {
 842         ri = sk_CMS_RecipientInfo_value(ris, i);
 843         if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_PASS)
 844             continue;
 845
 846         /* Must try each PasswordRecipientInfo */
 847         match_ri = 1;
 848         CMS_RecipientInfo_set0_password(ri, pass, passlen);
 849         r = CMS_RecipientInfo_decrypt(cms, ri);
 850         CMS_RecipientInfo_set0_password(ri, NULL, 0);
 851         if (r > 0)
 852             return 1;
 853     }
 854
 855     if (!match_ri)
 856         ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_RECIPIENT);
 857     return 0;
 858
 859 }
 860
 861 int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert,
 862                 BIO *dcont, BIO *out, unsigned int flags)
 863 {
 864     int r;
 865     BIO *cont;
 866     CMS_EncryptedContentInfo *ec;
 867     int nid = OBJ_obj2nid(CMS_get0_type(cms));
 868
 869     if (nid != NID_pkcs7_enveloped
 870             && nid != NID_id_smime_ct_authEnvelopedData) {
 871         ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_ENVELOPED_DATA);
 872         return 0;
 873     }
 874     if (dcont == NULL && !check_content(cms))
 875         return 0;
 876     ec = ossl_cms_get0_env_enc_content(cms);
 877     ec->debug = (flags & CMS_DEBUG_DECRYPT) != 0;
 878     ec->havenocert = cert == NULL;
 879     if (pk == NULL && cert == NULL && dcont == NULL && out == NULL)
 880         return 1;
 881     if (pk != NULL && !CMS_decrypt_set1_pkey(cms, pk, cert))
 882         return 0;
 883     cont = CMS_dataInit(cms, dcont);
 884     if (cont == NULL)
 885         return 0;
 886     r = cms_copy_content(out, cont, flags);
 887     do_free_upto(cont, dcont);
 888     return r;
 889 }
 890
 891 int CMS_final(CMS_ContentInfo *cms, BIO *data, BIO *dcont, unsigned int flags)
 892 {
 893     BIO *cmsbio;
 894     int ret = 0;
 895
 896     if ((cmsbio = CMS_dataInit(cms, dcont)) == NULL) {
 897         ERR_raise(ERR_LIB_CMS, CMS_R_CMS_LIB);
 898         return 0;
 899     }
 900
 901     if (!SMIME_crlf_copy(data, cmsbio, flags)) {
 902         goto err;
 903     }
 904
 905     (void)BIO_flush(cmsbio);
 906
 907     if (!CMS_dataFinal(cms, cmsbio)) {
 908         ERR_raise(ERR_LIB_CMS, CMS_R_CMS_DATAFINAL_ERROR);
 909         goto err;
 910     }
 911
 912     ret = 1;
 913
 914 err:
 915     do_free_upto(cmsbio, dcont);
 916
 917     return ret;
 918
 919 }
 920
 921 int CMS_final_digest(CMS_ContentInfo *cms,
 922                      const unsigned char *md, unsigned int mdlen,
 923                      BIO *dcont, unsigned int flags)
 924 {
 925     BIO *cmsbio;
 926     int ret = 0;
 927
 928     if ((cmsbio = CMS_dataInit(cms, dcont)) == NULL) {
 929         ERR_raise(ERR_LIB_CMS, CMS_R_CMS_LIB);
 930         return 0;
 931     }
 932
 933     (void)BIO_flush(cmsbio);
 934
 935     if (!ossl_cms_DataFinal(cms, cmsbio, md, mdlen)) {
 936         ERR_raise(ERR_LIB_CMS, CMS_R_CMS_DATAFINAL_ERROR);
 937         goto err;
 938     }
 939     ret = 1;
 940
 941 err:
 942     do_free_upto(cmsbio, dcont);
 943     return ret;
 944 }
 945
 946 #ifndef OPENSSL_NO_ZLIB
 947
 948 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 949                    unsigned int flags)
 950 {
 951     BIO *cont;
 952     int r;
 953
 954     if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_id_smime_ct_compressedData) {
 955         ERR_raise(ERR_LIB_CMS, CMS_R_TYPE_NOT_COMPRESSED_DATA);
 956         return 0;
 957     }
 958
 959     if (dcont == NULL && !check_content(cms))
 960         return 0;
 961
 962     cont = CMS_dataInit(cms, dcont);
 963     if (cont == NULL)
 964         return 0;
 965     r = cms_copy_content(out, cont, flags);
 966     do_free_upto(cont, dcont);
 967     return r;
 968 }
 969
 970 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 971 {
 972     CMS_ContentInfo *cms;
 973
 974     if (comp_nid <= 0)
 975         comp_nid = NID_zlib_compression;
 976     cms = ossl_cms_CompressedData_create(comp_nid, NULL, NULL);
 977     if (cms == NULL)
 978         return NULL;
 979
 980     if (!(flags & CMS_DETACHED))
 981         CMS_set_detached(cms, 0);
 982
 983     if ((flags & CMS_STREAM) || CMS_final(cms, in, NULL, flags))
 984         return cms;
 985
 986     CMS_ContentInfo_free(cms);
 987     return NULL;
 988 }
 989
 990 #else
 991
 992 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 993                    unsigned int flags)
 994 {
 995     ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 996     return 0;
 997 }
 998
 999 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
1000 {
1001     ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1002     return NULL;
1003 }
1004
1005 #endif