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 determine content digests */
  81         for (;;)
  82         {
  83                 i=BIO_read(in,buf,sizeof(buf));
  84                 if (i <= 0)
  85                         break;
  86                 if (tmpout)
  87                         BIO_write(tmpout, buf, i);
  88         }
  89
  90         if(flags & CMS_TEXT)
  91                 {
  92                 if(!SMIME_text(tmpout, out))
  93                         {
  94                         CMSerr(CMS_F_CMS_COPY_CONTENT,CMS_R_SMIME_TEXT_ERROR);
  95                         goto err;
  96                         }
  97                 }
  98
  99         r = 1;
 100
 101         err:
 102         if (tmpout && (tmpout != out))
 103                 BIO_free(tmpout);
 104         return r;
 105
 106         }
 107
 108 int CMS_data(CMS_ContentInfo *cms, BIO *out, unsigned int flags)
 109         {
 110         BIO *cont;
 111         int r;
 112         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_data)
 113                 {
 114                 CMSerr(CMS_F_CMS_DATA, CMS_R_TYPE_NOT_DATA);
 115                 return 0;
 116                 }
 117         cont = CMS_dataInit(cms, NULL);
 118         if (!cont)
 119                 return 0;
 120         r = cms_copy_content(out, cont, flags);
 121         BIO_free_all(cont);
 122         return r;
 123         }
 124
 125 CMS_ContentInfo *CMS_data_create(BIO *in, unsigned int flags)
 126         {
 127         CMS_ContentInfo *cms;
 128         cms = cms_Data_create();
 129         if (!cms)
 130                 return NULL;
 131
 132         if ((flags & CMS_STREAM) || CMS_final(cms, in, flags))
 133                 return cms;
 134
 135         CMS_ContentInfo_free(cms);
 136
 137         return NULL;
 138         }
 139
 140 int CMS_digest_verify(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 141                                                         unsigned int flags)
 142         {
 143         BIO *cont;
 144         int r;
 145         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_digest)
 146                 {
 147                 CMSerr(CMS_F_CMS_DIGEST_VERIFY, CMS_R_TYPE_NOT_DIGESTED_DATA);
 148                 return 0;
 149                 }
 150
 151         if (!dcont)
 152                 {
 153                 ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
 154                 if (!pos || !*pos)
 155                         {
 156                         CMSerr(CMS_F_CMS_DIGEST_VERIFY, CMS_R_NO_CONTENT);
 157                         return 0;
 158                         }
 159                 }
 160
 161         cont = CMS_dataInit(cms, dcont);
 162         if (!cont)
 163                 return 0;
 164         r = cms_copy_content(out, cont, flags);
 165         if (r)
 166                 r = cms_DigestedData_do_final(cms, cont, 1);
 167         BIO_free_all(cont);
 168         return r;
 169         }
 170
 171 CMS_ContentInfo *CMS_digest_create(BIO *in, const EVP_MD *md,
 172                                         unsigned int flags)
 173         {
 174         CMS_ContentInfo *cms;
 175         if (!md)
 176                 md = EVP_sha1();
 177         cms = cms_DigestedData_create(md);
 178         if (!cms)
 179                 return NULL;
 180
 181         if(!(flags & CMS_DETACHED))
 182                 CMS_set_detached(cms, 0);
 183
 184         if ((flags & CMS_STREAM) || CMS_final(cms, in, flags))
 185                 return cms;
 186
 187         CMS_ContentInfo_free(cms);
 188         return NULL;
 189         }
 190
 191 int CMS_EncryptedData_decrypt(CMS_ContentInfo *cms,
 192                                 const unsigned char *key, size_t keylen,
 193                                 BIO *dcont, BIO *out, unsigned int flags)
 194         {
 195         BIO *cont;
 196         int r;
 197         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_encrypted)
 198                 {
 199                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_DECRYPT,
 200                                         CMS_R_TYPE_NOT_ENCRYPTED_DATA);
 201                 return 0;
 202                 }
 203
 204         if (!dcont)
 205                 {
 206                 ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
 207                 if (!pos || !*pos)
 208                         {
 209                         CMSerr(CMS_F_CMS_ENCRYPTEDDATA_DECRYPT,
 210                                         CMS_R_NO_CONTENT);
 211                         return 0;
 212                         }
 213                 }
 214
 215         if (CMS_EncryptedData_set1_key(cms, NULL, key, keylen) <= 0)
 216                 return 0;
 217         cont = CMS_dataInit(cms, dcont);
 218         if (!cont)
 219                 return 0;
 220         r = cms_copy_content(out, cont, flags);
 221         BIO_free_all(cont);
 222         return r;
 223         }
 224
 225 CMS_ContentInfo *CMS_EncryptedData_encrypt(BIO *in, const EVP_CIPHER *cipher,
 226                                         const unsigned char *key, size_t keylen,
 227                                         unsigned int flags)
 228         {
 229         CMS_ContentInfo *cms;
 230         cms = CMS_ContentInfo_new();
 231         if (!cms)
 232                 return NULL;
 233         if (!CMS_EncryptedData_set1_key(cms, cipher, key, keylen))
 234                 return NULL;
 235
 236         if(!(flags & CMS_DETACHED))
 237                 CMS_set_detached(cms, 0);
 238
 239         if ((flags & (CMS_STREAM|CMS_PARTIAL)) || CMS_final(cms, in, flags))
 240                 return cms;
 241
 242         CMS_ContentInfo_free(cms);
 243         return NULL;
 244         }
 245
 246 static int cms_signerinfo_verify_cert(CMS_SignerInfo *si,
 247                                         X509_STORE *store,
 248                                         STACK_OF(X509) *certs,
 249                                         STACK_OF(X509_CRL) *crls,
 250                                         unsigned int flags)
 251         {
 252         X509_STORE_CTX ctx;
 253         X509 *signer;
 254         int i, j, r = 0;
 255         CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 256         if (!X509_STORE_CTX_init(&ctx, store, signer, certs))
 257                 {
 258                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT,
 259                                                 CMS_R_STORE_INIT_ERROR);
 260                 goto err;
 261                 }
 262         X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_SMIME_SIGN);
 263         if (crls)
 264                 X509_STORE_CTX_set0_crls(&ctx, crls);
 265
 266         i = X509_verify_cert(&ctx);
 267         if (i <= 0)
 268                 {
 269                 j = X509_STORE_CTX_get_error(&ctx);
 270                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT,
 271                                                 CMS_R_CERTIFICATE_VERIFY_ERROR);
 272                 ERR_add_error_data(2, "Verify error:",
 273                                          X509_verify_cert_error_string(j));
 274                 goto err;
 275                 }
 276         r = 1;
 277         err:
 278         X509_STORE_CTX_cleanup(&ctx);
 279         return r;
 280
 281         }
 282
 283 int CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs,
 284                  X509_STORE *store, BIO *dcont, BIO *out, unsigned int flags)
 285         {
 286         CMS_SignerInfo *si;
 287         STACK_OF(CMS_SignerInfo) *sinfos;
 288         STACK_OF(X509) *cms_certs = NULL;
 289         STACK_OF(X509_CRL) *crls = NULL;
 290         X509 *signer;
 291         int i, scount = 0, ret = 0;
 292         BIO *cmsbio = NULL, *tmpin = NULL;
 293
 294         if (!dcont)
 295                 {
 296                 ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
 297                 if (!pos || !*pos)
 298                         {
 299                         CMSerr(CMS_F_CMS_VERIFY, CMS_R_NO_CONTENT);
 300                         return 0;
 301                         }
 302                 }
 303
 304         /* Attempt to find all signer certificates */
 305
 306         sinfos = CMS_get0_SignerInfos(cms);
 307
 308         if (sk_CMS_SignerInfo_num(sinfos) <= 0)
 309                 {
 310                 CMSerr(CMS_F_CMS_VERIFY, CMS_R_NO_SIGNERS);
 311                 goto err;
 312                 }
 313
 314         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 315                 {
 316                 si = sk_CMS_SignerInfo_value(sinfos, i);
 317                 CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 318                 if (signer)
 319                         scount++;
 320                 }
 321
 322         if (scount != sk_CMS_SignerInfo_num(sinfos))
 323                 scount += CMS_set1_signers_certs(cms, certs, flags);
 324
 325         if (scount != sk_CMS_SignerInfo_num(sinfos))
 326                 {
 327                 CMSerr(CMS_F_CMS_VERIFY, CMS_R_SIGNER_CERTIFICATE_NOT_FOUND);
 328                 goto err;
 329                 }
 330
 331         /* Attempt to verify all signers certs */
 332
 333         if (!(flags & CMS_NO_SIGNER_CERT_VERIFY))
 334                 {
 335                 cms_certs = CMS_get1_certs(cms);
 336                 crls = CMS_get1_crls(cms);
 337                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 338                         {
 339                         si = sk_CMS_SignerInfo_value(sinfos, i);
 340                         if (!cms_signerinfo_verify_cert(si, store,
 341                                                         cms_certs, crls, flags))
 342                                 goto err;
 343                         }
 344                 }
 345
 346         /* Attempt to verify all SignerInfo signed attribute signatures */
 347
 348         if (!(flags & CMS_NO_ATTR_VERIFY))
 349                 {
 350                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 351                         {
 352                         si = sk_CMS_SignerInfo_value(sinfos, i);
 353                         if (CMS_signed_get_attr_count(si) < 0)
 354                                 continue;
 355                         if (CMS_SignerInfo_verify(si) <= 0)
 356                                 goto err;
 357                         }
 358                 }
 359
 360         /* Performance optimization: if the content is a memory BIO then
 361          * store its contents in a temporary read only memory BIO. This
 362          * avoids potentially large numbers of slow copies of data which will
 363          * occur when reading from a read write memory BIO when signatures
 364          * are calculated.
 365          */
 366
 367         if (dcont && (BIO_method_type(dcont) == BIO_TYPE_MEM))
 368                 {
 369                 char *ptr;
 370                 long len;
 371                 len = BIO_get_mem_data(dcont, &ptr);
 372                 tmpin = BIO_new_mem_buf(ptr, len);
 373                 if (tmpin == NULL)
 374                         {
 375                         CMSerr(CMS_F_CMS_VERIFY,ERR_R_MALLOC_FAILURE);
 376                         return 0;
 377                         }
 378                 }
 379         else
 380                 tmpin = dcont;
 381
 382
 383         cmsbio=CMS_dataInit(cms, tmpin);
 384         if (!cmsbio)
 385                 goto err;
 386
 387         if (!cms_copy_content(out, cmsbio, flags))
 388                 goto err;
 389
 390         if (!(flags & CMS_NO_CONTENT_VERIFY))
 391                 {
 392                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 393                         {
 394                         si = sk_CMS_SignerInfo_value(sinfos, i);
 395                         if (!CMS_SignerInfo_verify_content(si, cmsbio))
 396                                 {
 397                                 CMSerr(CMS_F_CMS_VERIFY,
 398                                         CMS_R_CONTENT_VERIFY_ERROR);
 399                                 goto err;
 400                                 }
 401                         }
 402                 }
 403
 404         ret = 1;
 405
 406         err:
 407
 408         if (dcont && (tmpin == dcont))
 409                 BIO_pop(cmsbio);
 410         BIO_free_all(cmsbio);
 411
 412         if (cms_certs)
 413                 sk_X509_pop_free(cms_certs, X509_free);
 414         if (crls)
 415                 sk_X509_CRL_pop_free(crls, X509_CRL_free);
 416
 417         return ret;
 418         }
 419
 420 CMS_ContentInfo *CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
 421                                                 BIO *data, unsigned int flags)
 422         {
 423         CMS_ContentInfo *cms;
 424         int i;
 425         cms = CMS_ContentInfo_new();
 426         if (!cms)
 427                 goto merr;
 428         if (pkey && !CMS_add1_signer(cms, signcert, pkey, NULL, flags))
 429                 {
 430                 CMSerr(CMS_F_CMS_SIGN, CMS_R_ADD_SIGNER_ERROR);
 431                 goto err;
 432                 }
 433         for (i = 0; i < sk_X509_num(certs); i++)
 434                 {
 435                 X509 *x = sk_X509_value(certs, i);
 436                 if (!CMS_add1_cert(cms, x))
 437                         goto merr;
 438                 }
 439         /* If no signer or certs initialize signedData */
 440         if (!pkey && !i && !CMS_SignedData_init(cms))
 441                 goto merr;
 442
 443         if(!(flags & CMS_DETACHED))
 444                 CMS_set_detached(cms, 0);
 445
 446         if ((flags & (CMS_STREAM|CMS_PARTIAL)) || CMS_final(cms, data, flags))
 447                 return cms;
 448
 449         return cms;
 450
 451         merr:
 452         CMSerr(CMS_F_CMS_SIGN, ERR_R_MALLOC_FAILURE);
 453
 454         err:
 455         if (cms)
 456                 CMS_ContentInfo_free(cms);
 457         return NULL;
 458         }
 459
 460 /* Placeholders for now... */
 461
 462 CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *in,
 463                                 const EVP_CIPHER *cipher, unsigned int flags)
 464         {
 465         return NULL;
 466         }
 467
 468 int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pkey, X509 *cert, BIO *data,
 469                                 unsigned int flags)
 470         {
 471         return 0;
 472         }
 473
 474 int CMS_final(CMS_ContentInfo *cms, BIO *data, int flags)
 475         {
 476         BIO *cmsbio;
 477         int ret = 0;
 478         if (!(cmsbio = CMS_dataInit(cms, NULL)))
 479                 {
 480                 CMSerr(CMS_F_CMS_FINAL,ERR_R_MALLOC_FAILURE);
 481                 return 0;
 482                 }
 483
 484         SMIME_crlf_copy(data, cmsbio, flags);
 485
 486         (void)BIO_flush(cmsbio);
 487
 488
 489         if (!CMS_dataFinal(cms, cmsbio))
 490                 {
 491                 CMSerr(CMS_F_CMS_FINAL,CMS_R_CMS_DATAFINAL_ERROR);
 492                 goto err;
 493                 }
 494
 495         ret = 1;
 496
 497         err:
 498         BIO_free_all(cmsbio);
 499
 500         return ret;
 501
 502         }
 503
 504 #ifdef ZLIB
 505
 506 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 507                                                         unsigned int flags)
 508         {
 509         BIO *cont;
 510         int r;
 511         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_id_smime_ct_compressedData)
 512                 {
 513                 CMSerr(CMS_F_CMS_UNCOMPRESS,
 514                                         CMS_R_TYPE_NOT_COMPRESSED_DATA);
 515                 return 0;
 516                 }
 517
 518         if (!dcont)
 519                 {
 520                 ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
 521                 if (!pos || !*pos)
 522                         {
 523                         CMSerr(CMS_F_CMS_UNCOMPRESS, CMS_R_NO_CONTENT);
 524                         return 0;
 525                         }
 526                 }
 527
 528         cont = CMS_dataInit(cms, dcont);
 529         if (!cont)
 530                 return 0;
 531         r = cms_copy_content(out, cont, flags);
 532         BIO_free_all(cont);
 533         return r;
 534         }
 535
 536 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 537         {
 538         CMS_ContentInfo *cms;
 539         if (comp_nid <= 0)
 540                 comp_nid = NID_zlib_compression;
 541         cms = cms_CompressedData_create(comp_nid);
 542         if (!cms)
 543                 return NULL;
 544
 545         if(!(flags & CMS_DETACHED))
 546                 CMS_set_detached(cms, 0);
 547
 548         if ((flags & CMS_STREAM) || CMS_final(cms, in, flags))
 549                 return cms;
 550
 551         CMS_ContentInfo_free(cms);
 552         return NULL;
 553         }
 554
 555 #else
 556
 557 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 558                                                         unsigned int flags)
 559         {
 560         CMSerr(CMS_F_CMS_UNCOMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 561         return 0;
 562         }
 563
 564 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 565         {
 566         CMSerr(CMS_F_CMS_COMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 567         return NULL;
 568         }
 569
 570 #endif