crypto/cms/cms_smime.c

   1 /* crypto/cms/cms_smime.c */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  */
  53
  54 #include "cryptlib.h"
  55 #include <openssl/asn1t.h>
  56 #include <openssl/x509.h>
  57 #include <openssl/x509v3.h>
  58 #include <openssl/err.h>
  59 #include <openssl/cms.h>
  60 #include "cms_lcl.h"
  61
  62 static int cms_copy_content(BIO *out, BIO *in, unsigned int flags)
  63         {
  64         unsigned char buf[4096];
  65         int r = 0, i;
  66         BIO *tmpout = NULL;
  67
  68         if(flags & CMS_TEXT)
  69                 {
  70                 tmpout = BIO_new(BIO_s_mem());
  71                 if(!tmpout)
  72                         {
  73                         CMSerr(CMS_F_CMS_COPY_CONTENT,ERR_R_MALLOC_FAILURE);
  74                         goto err;
  75                         }
  76                 }
  77         else
  78                 tmpout = out;
  79
  80         /* Read all content through chain to process digest, decrypt etc */
  81         for (;;)
  82         {
  83                 i=BIO_read(in,buf,sizeof(buf));
  84                 if (i <= 0)
  85                         {
  86                         if (BIO_method_type(in) == BIO_TYPE_CIPHER)
  87                                 {
  88                                 if (!BIO_get_cipher_status(in))
  89                                         goto err;
  90                                 }
  91                         break;
  92                         }
  93
  94                 if (tmpout)
  95                         BIO_write(tmpout, buf, i);
  96         }
  97
  98         if(flags & CMS_TEXT)
  99                 {
 100                 if(!SMIME_text(tmpout, out))
 101                         {
 102                         CMSerr(CMS_F_CMS_COPY_CONTENT,CMS_R_SMIME_TEXT_ERROR);
 103                         goto err;
 104                         }
 105                 }
 106
 107         r = 1;
 108
 109         err:
 110         if (tmpout && (tmpout != out))
 111                 BIO_free(tmpout);
 112         return r;
 113
 114         }
 115
 116 static int check_content(CMS_ContentInfo *cms)
 117         {
 118         ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
 119         if (!pos || !*pos)
 120                 {
 121                 CMSerr(CMS_F_CHECK_CONTENT, CMS_R_NO_CONTENT);
 122                 return 0;
 123                 }
 124         return 1;
 125         }
 126
 127 int CMS_data(CMS_ContentInfo *cms, BIO *out, unsigned int flags)
 128         {
 129         BIO *cont;
 130         int r;
 131         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_data)
 132                 {
 133                 CMSerr(CMS_F_CMS_DATA, CMS_R_TYPE_NOT_DATA);
 134                 return 0;
 135                 }
 136         cont = CMS_dataInit(cms, NULL);
 137         if (!cont)
 138                 return 0;
 139         r = cms_copy_content(out, cont, flags);
 140         BIO_free_all(cont);
 141         return r;
 142         }
 143
 144 CMS_ContentInfo *CMS_data_create(BIO *in, unsigned int flags)
 145         {
 146         CMS_ContentInfo *cms;
 147         cms = cms_Data_create();
 148         if (!cms)
 149                 return NULL;
 150
 151         if ((flags & CMS_STREAM) || CMS_final(cms, in, flags))
 152                 return cms;
 153
 154         CMS_ContentInfo_free(cms);
 155
 156         return NULL;
 157         }
 158
 159 int CMS_digest_verify(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 160                                                         unsigned int flags)
 161         {
 162         BIO *cont;
 163         int r;
 164         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_digest)
 165                 {
 166                 CMSerr(CMS_F_CMS_DIGEST_VERIFY, CMS_R_TYPE_NOT_DIGESTED_DATA);
 167                 return 0;
 168                 }
 169
 170         if (!dcont && !check_content(cms))
 171                 return 0;
 172
 173         cont = CMS_dataInit(cms, dcont);
 174         if (!cont)
 175                 return 0;
 176         r = cms_copy_content(out, cont, flags);
 177         if (r)
 178                 r = cms_DigestedData_do_final(cms, cont, 1);
 179         BIO_free_all(cont);
 180         return r;
 181         }
 182
 183 CMS_ContentInfo *CMS_digest_create(BIO *in, const EVP_MD *md,
 184                                         unsigned int flags)
 185         {
 186         CMS_ContentInfo *cms;
 187         if (!md)
 188                 md = EVP_sha1();
 189         cms = cms_DigestedData_create(md);
 190         if (!cms)
 191                 return NULL;
 192
 193         if(!(flags & CMS_DETACHED))
 194                 CMS_set_detached(cms, 0);
 195
 196         if ((flags & CMS_STREAM) || CMS_final(cms, in, flags))
 197                 return cms;
 198
 199         CMS_ContentInfo_free(cms);
 200         return NULL;
 201         }
 202
 203 int CMS_EncryptedData_decrypt(CMS_ContentInfo *cms,
 204                                 const unsigned char *key, size_t keylen,
 205                                 BIO *dcont, BIO *out, unsigned int flags)
 206         {
 207         BIO *cont;
 208         int r;
 209         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_encrypted)
 210                 {
 211                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_DECRYPT,
 212                                         CMS_R_TYPE_NOT_ENCRYPTED_DATA);
 213                 return 0;
 214                 }
 215
 216         if (!dcont && !check_content(cms))
 217                 return 0;
 218
 219         if (CMS_EncryptedData_set1_key(cms, NULL, key, keylen) <= 0)
 220                 return 0;
 221         cont = CMS_dataInit(cms, dcont);
 222         if (!cont)
 223                 return 0;
 224         r = cms_copy_content(out, cont, flags);
 225         BIO_free_all(cont);
 226         return r;
 227         }
 228
 229 CMS_ContentInfo *CMS_EncryptedData_encrypt(BIO *in, const EVP_CIPHER *cipher,
 230                                         const unsigned char *key, size_t keylen,
 231                                         unsigned int flags)
 232         {
 233         CMS_ContentInfo *cms;
 234         if (!cipher)
 235                 {
 236                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_ENCRYPT, CMS_R_NO_CIPHER);
 237                 return NULL;
 238                 }
 239         cms = CMS_ContentInfo_new();
 240         if (!cms)
 241                 return NULL;
 242         if (!CMS_EncryptedData_set1_key(cms, cipher, key, keylen))
 243                 return NULL;
 244
 245         if(!(flags & CMS_DETACHED))
 246                 CMS_set_detached(cms, 0);
 247
 248         if ((flags & (CMS_STREAM|CMS_PARTIAL)) || CMS_final(cms, in, flags))
 249                 return cms;
 250
 251         CMS_ContentInfo_free(cms);
 252         return NULL;
 253         }
 254
 255 static int cms_signerinfo_verify_cert(CMS_SignerInfo *si,
 256                                         X509_STORE *store,
 257                                         STACK_OF(X509) *certs,
 258                                         STACK_OF(X509_CRL) *crls,
 259                                         unsigned int flags)
 260         {
 261         X509_STORE_CTX ctx;
 262         X509 *signer;
 263         int i, j, r = 0;
 264         CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 265         if (!X509_STORE_CTX_init(&ctx, store, signer, certs))
 266                 {
 267                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT,
 268                                                 CMS_R_STORE_INIT_ERROR);
 269                 goto err;
 270                 }
 271         X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_SMIME_SIGN);
 272         if (crls)
 273                 X509_STORE_CTX_set0_crls(&ctx, crls);
 274
 275         i = X509_verify_cert(&ctx);
 276         if (i <= 0)
 277                 {
 278                 j = X509_STORE_CTX_get_error(&ctx);
 279                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT,
 280                                                 CMS_R_CERTIFICATE_VERIFY_ERROR);
 281                 ERR_add_error_data(2, "Verify error:",
 282                                          X509_verify_cert_error_string(j));
 283                 goto err;
 284                 }
 285         r = 1;
 286         err:
 287         X509_STORE_CTX_cleanup(&ctx);
 288         return r;
 289
 290         }
 291
 292 int CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs,
 293                  X509_STORE *store, BIO *dcont, BIO *out, unsigned int flags)
 294         {
 295         CMS_SignerInfo *si;
 296         STACK_OF(CMS_SignerInfo) *sinfos;
 297         STACK_OF(X509) *cms_certs = NULL;
 298         STACK_OF(X509_CRL) *crls = NULL;
 299         X509 *signer;
 300         int i, scount = 0, ret = 0;
 301         BIO *cmsbio = NULL, *tmpin = NULL;
 302
 303         if (!dcont && !check_content(cms))
 304                 return 0;
 305
 306         /* Attempt to find all signer certificates */
 307
 308         sinfos = CMS_get0_SignerInfos(cms);
 309
 310         if (sk_CMS_SignerInfo_num(sinfos) <= 0)
 311                 {
 312                 CMSerr(CMS_F_CMS_VERIFY, CMS_R_NO_SIGNERS);
 313                 goto err;
 314                 }
 315
 316         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 317                 {
 318                 si = sk_CMS_SignerInfo_value(sinfos, i);
 319                 CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 320                 if (signer)
 321                         scount++;
 322                 }
 323
 324         if (scount != sk_CMS_SignerInfo_num(sinfos))
 325                 scount += CMS_set1_signers_certs(cms, certs, flags);
 326
 327         if (scount != sk_CMS_SignerInfo_num(sinfos))
 328                 {
 329                 CMSerr(CMS_F_CMS_VERIFY, CMS_R_SIGNER_CERTIFICATE_NOT_FOUND);
 330                 goto err;
 331                 }
 332
 333         /* Attempt to verify all signers certs */
 334
 335         if (!(flags & CMS_NO_SIGNER_CERT_VERIFY))
 336                 {
 337                 cms_certs = CMS_get1_certs(cms);
 338                 crls = CMS_get1_crls(cms);
 339                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 340                         {
 341                         si = sk_CMS_SignerInfo_value(sinfos, i);
 342                         if (!cms_signerinfo_verify_cert(si, store,
 343                                                         cms_certs, crls, flags))
 344                                 goto err;
 345                         }
 346                 }
 347
 348         /* Attempt to verify all SignerInfo signed attribute signatures */
 349
 350         if (!(flags & CMS_NO_ATTR_VERIFY))
 351                 {
 352                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 353                         {
 354                         si = sk_CMS_SignerInfo_value(sinfos, i);
 355                         if (CMS_signed_get_attr_count(si) < 0)
 356                                 continue;
 357                         if (CMS_SignerInfo_verify(si) <= 0)
 358                                 goto err;
 359                         }
 360                 }
 361
 362         /* Performance optimization: if the content is a memory BIO then
 363          * store its contents in a temporary read only memory BIO. This
 364          * avoids potentially large numbers of slow copies of data which will
 365          * occur when reading from a read write memory BIO when signatures
 366          * are calculated.
 367          */
 368
 369         if (dcont && (BIO_method_type(dcont) == BIO_TYPE_MEM))
 370                 {
 371                 char *ptr;
 372                 long len;
 373                 len = BIO_get_mem_data(dcont, &ptr);
 374                 tmpin = BIO_new_mem_buf(ptr, len);
 375                 if (tmpin == NULL)
 376                         {
 377                         CMSerr(CMS_F_CMS_VERIFY,ERR_R_MALLOC_FAILURE);
 378                         return 0;
 379                         }
 380                 }
 381         else
 382                 tmpin = dcont;
 383
 384
 385         cmsbio=CMS_dataInit(cms, tmpin);
 386         if (!cmsbio)
 387                 goto err;
 388
 389         if (!cms_copy_content(out, cmsbio, flags))
 390                 goto err;
 391
 392         if (!(flags & CMS_NO_CONTENT_VERIFY))
 393                 {
 394                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 395                         {
 396                         si = sk_CMS_SignerInfo_value(sinfos, i);
 397                         if (!CMS_SignerInfo_verify_content(si, cmsbio))
 398                                 {
 399                                 CMSerr(CMS_F_CMS_VERIFY,
 400                                         CMS_R_CONTENT_VERIFY_ERROR);
 401                                 goto err;
 402                                 }
 403                         }
 404                 }
 405
 406         ret = 1;
 407
 408         err:
 409
 410         if (dcont && (tmpin == dcont))
 411                 BIO_pop(cmsbio);
 412         BIO_free_all(cmsbio);
 413
 414         if (cms_certs)
 415                 sk_X509_pop_free(cms_certs, X509_free);
 416         if (crls)
 417                 sk_X509_CRL_pop_free(crls, X509_CRL_free);
 418
 419         return ret;
 420         }
 421
 422 CMS_ContentInfo *CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
 423                                                 BIO *data, unsigned int flags)
 424         {
 425         CMS_ContentInfo *cms;
 426         int i;
 427         cms = CMS_ContentInfo_new();
 428         if (!cms)
 429                 goto merr;
 430         if (pkey && !CMS_add1_signer(cms, signcert, pkey, NULL, flags))
 431                 {
 432                 CMSerr(CMS_F_CMS_SIGN, CMS_R_ADD_SIGNER_ERROR);
 433                 goto err;
 434                 }
 435         for (i = 0; i < sk_X509_num(certs); i++)
 436                 {
 437                 X509 *x = sk_X509_value(certs, i);
 438                 if (!CMS_add1_cert(cms, x))
 439                         goto merr;
 440                 }
 441         /* If no signer or certs initialize signedData */
 442         if (!pkey && !i && !CMS_SignedData_init(cms))
 443                 goto merr;
 444
 445         if(!(flags & CMS_DETACHED))
 446                 CMS_set_detached(cms, 0);
 447
 448         if ((flags & (CMS_STREAM|CMS_PARTIAL)) || CMS_final(cms, data, flags))
 449                 return cms;
 450
 451         return cms;
 452
 453         merr:
 454         CMSerr(CMS_F_CMS_SIGN, ERR_R_MALLOC_FAILURE);
 455
 456         err:
 457         if (cms)
 458                 CMS_ContentInfo_free(cms);
 459         return NULL;
 460         }
 461
 462 /* Placeholder for now... */
 463
 464 CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *in,
 465                                 const EVP_CIPHER *cipher, unsigned int flags)
 466         {
 467         return NULL;
 468         }
 469
 470 int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert,
 471                                 BIO *dcont, BIO *out,
 472                                 unsigned int flags)
 473         {
 474         STACK_OF(CMS_RecipientInfo) *ris;
 475         CMS_RecipientInfo *ri;
 476         int i, r;
 477         BIO *cont;
 478         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_enveloped)
 479                 {
 480                 CMSerr(CMS_F_CMS_DECRYPT, CMS_R_TYPE_NOT_ENVELOPED_DATA);
 481                 return 0;
 482                 }
 483         if (!dcont && !check_content(cms))
 484                 return 0;
 485         ris = CMS_get0_RecipientInfos(cms);
 486         for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++)
 487                 {
 488                 ri = sk_CMS_RecipientInfo_value(ris, i);
 489                 if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_TRANS)
 490                         continue;
 491                 if (cert)
 492                         {
 493                         if (CMS_RecipientInfo_ktri_cert_cmp(ri, cert) == 0)
 494                                 {
 495                                 if (CMS_RecipientInfo_decrypt(cms, ri, pk) <=0)
 496                                         return 0;
 497                                 else
 498                                         break;
 499                                 }
 500                         }
 501                 }
 502
 503         if (i == sk_CMS_RecipientInfo_num(ris))
 504                 {
 505                 CMSerr(CMS_F_CMS_DECRYPT, CMS_R_NO_MATCHING_RECIPIENT);
 506                 return 0;
 507                 }
 508         cont = CMS_dataInit(cms, dcont);
 509         if (!cont)
 510                 return 0;
 511         r = cms_copy_content(out, cont, flags);
 512         BIO_free_all(cont);
 513         return r;
 514         }
 515
 516 int CMS_final(CMS_ContentInfo *cms, BIO *data, int flags)
 517         {
 518         BIO *cmsbio;
 519         int ret = 0;
 520         if (!(cmsbio = CMS_dataInit(cms, NULL)))
 521                 {
 522                 CMSerr(CMS_F_CMS_FINAL,ERR_R_MALLOC_FAILURE);
 523                 return 0;
 524                 }
 525
 526         SMIME_crlf_copy(data, cmsbio, flags);
 527
 528         (void)BIO_flush(cmsbio);
 529
 530
 531         if (!CMS_dataFinal(cms, cmsbio))
 532                 {
 533                 CMSerr(CMS_F_CMS_FINAL,CMS_R_CMS_DATAFINAL_ERROR);
 534                 goto err;
 535                 }
 536
 537         ret = 1;
 538
 539         err:
 540         BIO_free_all(cmsbio);
 541
 542         return ret;
 543
 544         }
 545
 546 #ifdef ZLIB
 547
 548 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 549                                                         unsigned int flags)
 550         {
 551         BIO *cont;
 552         int r;
 553         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_id_smime_ct_compressedData)
 554                 {
 555                 CMSerr(CMS_F_CMS_UNCOMPRESS,
 556                                         CMS_R_TYPE_NOT_COMPRESSED_DATA);
 557                 return 0;
 558                 }
 559
 560         if (!dcont && !check_content(cms))
 561                 return 0;
 562
 563         cont = CMS_dataInit(cms, dcont);
 564         if (!cont)
 565                 return 0;
 566         r = cms_copy_content(out, cont, flags);
 567         BIO_free_all(cont);
 568         return r;
 569         }
 570
 571 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 572         {
 573         CMS_ContentInfo *cms;
 574         if (comp_nid <= 0)
 575                 comp_nid = NID_zlib_compression;
 576         cms = cms_CompressedData_create(comp_nid);
 577         if (!cms)
 578                 return NULL;
 579
 580         if(!(flags & CMS_DETACHED))
 581                 CMS_set_detached(cms, 0);
 582
 583         if ((flags & CMS_STREAM) || CMS_final(cms, in, flags))
 584                 return cms;
 585
 586         CMS_ContentInfo_free(cms);
 587         return NULL;
 588         }
 589
 590 #else
 591
 592 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 593                                                         unsigned int flags)
 594         {
 595         CMSerr(CMS_F_CMS_UNCOMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 596         return 0;
 597         }
 598
 599 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 600         {
 601         CMSerr(CMS_F_CMS_COMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 602         return NULL;
 603         }
 604
 605 #endif