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         cont = CMS_dataInit(cms, dcont);
 216         if (!cont)
 217                 return 0;
 218         r = CMS_EncryptedData_set1_key(cont, cms, key, keylen);
 219         if (r)
 220                 r = cms_copy_content(out, cont, flags);
 221         BIO_free_all(cont);
 222         return r;
 223         }
 224
 225 static int cms_signerinfo_verify_cert(CMS_SignerInfo *si,
 226                                         X509_STORE *store,
 227                                         STACK_OF(X509) *certs,
 228                                         STACK_OF(X509_CRL) *crls,
 229                                         unsigned int flags)
 230         {
 231         X509_STORE_CTX ctx;
 232         X509 *signer;
 233         int i, j, r = 0;
 234         CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 235         if (!X509_STORE_CTX_init(&ctx, store, signer, certs))
 236                 {
 237                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT,
 238                                                 CMS_R_STORE_INIT_ERROR);
 239                 goto err;
 240                 }
 241         X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_SMIME_SIGN);
 242         if (crls)
 243                 X509_STORE_CTX_set0_crls(&ctx, crls);
 244
 245         i = X509_verify_cert(&ctx);
 246         if (i <= 0)
 247                 {
 248                 j = X509_STORE_CTX_get_error(&ctx);
 249                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT,
 250                                                 CMS_R_CERTIFICATE_VERIFY_ERROR);
 251                 ERR_add_error_data(2, "Verify error:",
 252                                          X509_verify_cert_error_string(j));
 253                 goto err;
 254                 }
 255         r = 1;
 256         err:
 257         X509_STORE_CTX_cleanup(&ctx);
 258         return r;
 259
 260         }
 261
 262 int CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs,
 263                  X509_STORE *store, BIO *dcont, BIO *out, unsigned int flags)
 264         {
 265         CMS_SignerInfo *si;
 266         STACK_OF(CMS_SignerInfo) *sinfos;
 267         STACK_OF(X509) *cms_certs = NULL;
 268         STACK_OF(X509_CRL) *crls = NULL;
 269         X509 *signer;
 270         int i, scount = 0, ret = 0;
 271         BIO *cmsbio = NULL, *tmpin = NULL;
 272
 273         if (!dcont)
 274                 {
 275                 ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
 276                 if (!pos || !*pos)
 277                         {
 278                         CMSerr(CMS_F_CMS_VERIFY, CMS_R_NO_CONTENT);
 279                         return 0;
 280                         }
 281                 }
 282
 283         /* Attempt to find all signer certificates */
 284
 285         sinfos = CMS_get0_SignerInfos(cms);
 286
 287         if (sk_CMS_SignerInfo_num(sinfos) <= 0)
 288                 {
 289                 CMSerr(CMS_F_CMS_VERIFY, CMS_R_NO_SIGNERS);
 290                 goto err;
 291                 }
 292
 293         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 294                 {
 295                 si = sk_CMS_SignerInfo_value(sinfos, i);
 296                 CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 297                 if (signer)
 298                         scount++;
 299                 }
 300
 301         if (scount != sk_CMS_SignerInfo_num(sinfos))
 302                 scount += CMS_set1_signers_certs(cms, certs, flags);
 303
 304         if (scount != sk_CMS_SignerInfo_num(sinfos))
 305                 {
 306                 CMSerr(CMS_F_CMS_VERIFY, CMS_R_SIGNER_CERTIFICATE_NOT_FOUND);
 307                 goto err;
 308                 }
 309
 310         /* Attempt to verify all signers certs */
 311
 312         if (!(flags & CMS_NO_SIGNER_CERT_VERIFY))
 313                 {
 314                 cms_certs = CMS_get1_certs(cms);
 315                 crls = CMS_get1_crls(cms);
 316                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 317                         {
 318                         si = sk_CMS_SignerInfo_value(sinfos, i);
 319                         if (!cms_signerinfo_verify_cert(si, store,
 320                                                         cms_certs, crls, flags))
 321                                 goto err;
 322                         }
 323                 }
 324
 325         /* Attempt to verify all SignerInfo signed attribute signatures */
 326
 327         if (!(flags & CMS_NO_ATTR_VERIFY))
 328                 {
 329                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 330                         {
 331                         si = sk_CMS_SignerInfo_value(sinfos, i);
 332                         if (CMS_signed_get_attr_count(si) < 0)
 333                                 continue;
 334                         if (CMS_SignerInfo_verify(si) <= 0)
 335                                 goto err;
 336                         }
 337                 }
 338
 339         /* Performance optimization: if the content is a memory BIO then
 340          * store its contents in a temporary read only memory BIO. This
 341          * avoids potentially large numbers of slow copies of data which will
 342          * occur when reading from a read write memory BIO when signatures
 343          * are calculated.
 344          */
 345
 346         if (dcont && (BIO_method_type(dcont) == BIO_TYPE_MEM))
 347                 {
 348                 char *ptr;
 349                 long len;
 350                 len = BIO_get_mem_data(dcont, &ptr);
 351                 tmpin = BIO_new_mem_buf(ptr, len);
 352                 if (tmpin == NULL)
 353                         {
 354                         CMSerr(CMS_F_CMS_VERIFY,ERR_R_MALLOC_FAILURE);
 355                         return 0;
 356                         }
 357                 }
 358         else
 359                 tmpin = dcont;
 360
 361
 362         cmsbio=CMS_dataInit(cms, tmpin);
 363         if (!cmsbio)
 364                 goto err;
 365
 366         if (!cms_copy_content(out, cmsbio, flags))
 367                 goto err;
 368
 369         if (!(flags & CMS_NO_CONTENT_VERIFY))
 370                 {
 371                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 372                         {
 373                         si = sk_CMS_SignerInfo_value(sinfos, i);
 374                         if (!CMS_SignerInfo_verify_content(si, cmsbio))
 375                                 {
 376                                 CMSerr(CMS_F_CMS_VERIFY,
 377                                         CMS_R_CONTENT_VERIFY_ERROR);
 378                                 goto err;
 379                                 }
 380                         }
 381                 }
 382
 383         ret = 1;
 384
 385         err:
 386
 387         if (dcont && (tmpin == dcont))
 388                 BIO_pop(cmsbio);
 389         BIO_free_all(cmsbio);
 390
 391         if (cms_certs)
 392                 sk_X509_pop_free(cms_certs, X509_free);
 393         if (crls)
 394                 sk_X509_CRL_pop_free(crls, X509_CRL_free);
 395
 396         return ret;
 397         }
 398
 399 CMS_ContentInfo *CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
 400                                                 BIO *data, unsigned int flags)
 401         {
 402         CMS_ContentInfo *cms;
 403         int i;
 404         cms = CMS_ContentInfo_new();
 405         if (!cms)
 406                 goto merr;
 407         if (pkey && !CMS_add1_signer(cms, signcert, pkey, NULL, flags))
 408                 {
 409                 CMSerr(CMS_F_CMS_SIGN, CMS_R_ADD_SIGNER_ERROR);
 410                 goto err;
 411                 }
 412         for (i = 0; i < sk_X509_num(certs); i++)
 413                 {
 414                 X509 *x = sk_X509_value(certs, i);
 415                 if (!CMS_add1_cert(cms, x))
 416                         goto merr;
 417                 }
 418         /* If no signer or certs initialize signedData */
 419         if (!pkey && !i && !CMS_SignedData_init(cms))
 420                 goto merr;
 421
 422         if(!(flags & CMS_DETACHED))
 423                 CMS_set_detached(cms, 0);
 424
 425         if ((flags & (CMS_STREAM|CMS_PARTIAL)) || CMS_final(cms, data, flags))
 426                 return cms;
 427
 428         return cms;
 429
 430         merr:
 431         CMSerr(CMS_F_CMS_SIGN, ERR_R_MALLOC_FAILURE);
 432
 433         err:
 434         if (cms)
 435                 CMS_ContentInfo_free(cms);
 436         return NULL;
 437         }
 438
 439 /* Placeholders for now... */
 440
 441 CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *in,
 442                                 const EVP_CIPHER *cipher, unsigned int flags)
 443         {
 444         return NULL;
 445         }
 446
 447 int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pkey, X509 *cert, BIO *data,
 448                                 unsigned int flags)
 449         {
 450         return 0;
 451         }
 452
 453 int CMS_final(CMS_ContentInfo *cms, BIO *data, int flags)
 454         {
 455         BIO *cmsbio;
 456         int ret = 0;
 457         if (!(cmsbio = CMS_dataInit(cms, NULL)))
 458                 {
 459                 CMSerr(CMS_F_CMS_FINAL,ERR_R_MALLOC_FAILURE);
 460                 return 0;
 461                 }
 462
 463         SMIME_crlf_copy(data, cmsbio, flags);
 464
 465         (void)BIO_flush(cmsbio);
 466
 467
 468         if (!CMS_dataFinal(cms, cmsbio))
 469                 {
 470                 CMSerr(CMS_F_CMS_FINAL,CMS_R_CMS_DATAFINAL_ERROR);
 471                 goto err;
 472                 }
 473
 474         ret = 1;
 475
 476         err:
 477         BIO_free_all(cmsbio);
 478
 479         return ret;
 480
 481         }
 482
 483 #ifdef ZLIB
 484
 485 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 486                                                         unsigned int flags)
 487         {
 488         BIO *cont;
 489         int r;
 490         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_id_smime_ct_compressedData)
 491                 {
 492                 CMSerr(CMS_F_CMS_UNCOMPRESS,
 493                                         CMS_R_TYPE_NOT_COMPRESSED_DATA);
 494                 return 0;
 495                 }
 496
 497         if (!dcont)
 498                 {
 499                 ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
 500                 if (!pos || !*pos)
 501                         {
 502                         CMSerr(CMS_F_CMS_UNCOMPRESS, CMS_R_NO_CONTENT);
 503                         return 0;
 504                         }
 505                 }
 506
 507         cont = CMS_dataInit(cms, dcont);
 508         if (!cont)
 509                 return 0;
 510         r = cms_copy_content(out, cont, flags);
 511         BIO_free_all(cont);
 512         return r;
 513         }
 514
 515 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 516         {
 517         CMS_ContentInfo *cms;
 518         if (comp_nid <= 0)
 519                 comp_nid = NID_zlib_compression;
 520         cms = cms_CompressedData_create(comp_nid);
 521         if (!cms)
 522                 return NULL;
 523
 524         if(!(flags & CMS_DETACHED))
 525                 CMS_set_detached(cms, 0);
 526
 527         if ((flags & CMS_STREAM) || CMS_final(cms, in, flags))
 528                 return cms;
 529
 530         CMS_ContentInfo_free(cms);
 531         return NULL;
 532         }
 533
 534 #else
 535
 536 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 537                                                         unsigned int flags)
 538         {
 539         CMSerr(CMS_F_CMS_UNCOMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 540         return 0;
 541         }
 542
 543 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 544         {
 545         CMSerr(CMS_F_CMS_COMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 546         return NULL;
 547         }
 548
 549 #endif