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         if (!cipher)
 231                 {
 232                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_ENCRYPT, CMS_R_NO_CIPHER);
 233                 return NULL;
 234                 }
 235         cms = CMS_ContentInfo_new();
 236         if (!cms)
 237                 return NULL;
 238         if (!CMS_EncryptedData_set1_key(cms, cipher, key, keylen))
 239                 return NULL;
 240
 241         if(!(flags & CMS_DETACHED))
 242                 CMS_set_detached(cms, 0);
 243
 244         if ((flags & (CMS_STREAM|CMS_PARTIAL)) || CMS_final(cms, in, flags))
 245                 return cms;
 246
 247         CMS_ContentInfo_free(cms);
 248         return NULL;
 249         }
 250
 251 static int cms_signerinfo_verify_cert(CMS_SignerInfo *si,
 252                                         X509_STORE *store,
 253                                         STACK_OF(X509) *certs,
 254                                         STACK_OF(X509_CRL) *crls,
 255                                         unsigned int flags)
 256         {
 257         X509_STORE_CTX ctx;
 258         X509 *signer;
 259         int i, j, r = 0;
 260         CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 261         if (!X509_STORE_CTX_init(&ctx, store, signer, certs))
 262                 {
 263                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT,
 264                                                 CMS_R_STORE_INIT_ERROR);
 265                 goto err;
 266                 }
 267         X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_SMIME_SIGN);
 268         if (crls)
 269                 X509_STORE_CTX_set0_crls(&ctx, crls);
 270
 271         i = X509_verify_cert(&ctx);
 272         if (i <= 0)
 273                 {
 274                 j = X509_STORE_CTX_get_error(&ctx);
 275                 CMSerr(CMS_F_CMS_SIGNERINFO_VERIFY_CERT,
 276                                                 CMS_R_CERTIFICATE_VERIFY_ERROR);
 277                 ERR_add_error_data(2, "Verify error:",
 278                                          X509_verify_cert_error_string(j));
 279                 goto err;
 280                 }
 281         r = 1;
 282         err:
 283         X509_STORE_CTX_cleanup(&ctx);
 284         return r;
 285
 286         }
 287
 288 int CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs,
 289                  X509_STORE *store, BIO *dcont, BIO *out, unsigned int flags)
 290         {
 291         CMS_SignerInfo *si;
 292         STACK_OF(CMS_SignerInfo) *sinfos;
 293         STACK_OF(X509) *cms_certs = NULL;
 294         STACK_OF(X509_CRL) *crls = NULL;
 295         X509 *signer;
 296         int i, scount = 0, ret = 0;
 297         BIO *cmsbio = NULL, *tmpin = NULL;
 298
 299         if (!dcont)
 300                 {
 301                 ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
 302                 if (!pos || !*pos)
 303                         {
 304                         CMSerr(CMS_F_CMS_VERIFY, CMS_R_NO_CONTENT);
 305                         return 0;
 306                         }
 307                 }
 308
 309         /* Attempt to find all signer certificates */
 310
 311         sinfos = CMS_get0_SignerInfos(cms);
 312
 313         if (sk_CMS_SignerInfo_num(sinfos) <= 0)
 314                 {
 315                 CMSerr(CMS_F_CMS_VERIFY, CMS_R_NO_SIGNERS);
 316                 goto err;
 317                 }
 318
 319         for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 320                 {
 321                 si = sk_CMS_SignerInfo_value(sinfos, i);
 322                 CMS_SignerInfo_get0_algs(si, NULL, &signer, NULL, NULL);
 323                 if (signer)
 324                         scount++;
 325                 }
 326
 327         if (scount != sk_CMS_SignerInfo_num(sinfos))
 328                 scount += CMS_set1_signers_certs(cms, certs, flags);
 329
 330         if (scount != sk_CMS_SignerInfo_num(sinfos))
 331                 {
 332                 CMSerr(CMS_F_CMS_VERIFY, CMS_R_SIGNER_CERTIFICATE_NOT_FOUND);
 333                 goto err;
 334                 }
 335
 336         /* Attempt to verify all signers certs */
 337
 338         if (!(flags & CMS_NO_SIGNER_CERT_VERIFY))
 339                 {
 340                 cms_certs = CMS_get1_certs(cms);
 341                 crls = CMS_get1_crls(cms);
 342                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 343                         {
 344                         si = sk_CMS_SignerInfo_value(sinfos, i);
 345                         if (!cms_signerinfo_verify_cert(si, store,
 346                                                         cms_certs, crls, flags))
 347                                 goto err;
 348                         }
 349                 }
 350
 351         /* Attempt to verify all SignerInfo signed attribute signatures */
 352
 353         if (!(flags & CMS_NO_ATTR_VERIFY))
 354                 {
 355                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 356                         {
 357                         si = sk_CMS_SignerInfo_value(sinfos, i);
 358                         if (CMS_signed_get_attr_count(si) < 0)
 359                                 continue;
 360                         if (CMS_SignerInfo_verify(si) <= 0)
 361                                 goto err;
 362                         }
 363                 }
 364
 365         /* Performance optimization: if the content is a memory BIO then
 366          * store its contents in a temporary read only memory BIO. This
 367          * avoids potentially large numbers of slow copies of data which will
 368          * occur when reading from a read write memory BIO when signatures
 369          * are calculated.
 370          */
 371
 372         if (dcont && (BIO_method_type(dcont) == BIO_TYPE_MEM))
 373                 {
 374                 char *ptr;
 375                 long len;
 376                 len = BIO_get_mem_data(dcont, &ptr);
 377                 tmpin = BIO_new_mem_buf(ptr, len);
 378                 if (tmpin == NULL)
 379                         {
 380                         CMSerr(CMS_F_CMS_VERIFY,ERR_R_MALLOC_FAILURE);
 381                         return 0;
 382                         }
 383                 }
 384         else
 385                 tmpin = dcont;
 386
 387
 388         cmsbio=CMS_dataInit(cms, tmpin);
 389         if (!cmsbio)
 390                 goto err;
 391
 392         if (!cms_copy_content(out, cmsbio, flags))
 393                 goto err;
 394
 395         if (!(flags & CMS_NO_CONTENT_VERIFY))
 396                 {
 397                 for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++)
 398                         {
 399                         si = sk_CMS_SignerInfo_value(sinfos, i);
 400                         if (!CMS_SignerInfo_verify_content(si, cmsbio))
 401                                 {
 402                                 CMSerr(CMS_F_CMS_VERIFY,
 403                                         CMS_R_CONTENT_VERIFY_ERROR);
 404                                 goto err;
 405                                 }
 406                         }
 407                 }
 408
 409         ret = 1;
 410
 411         err:
 412
 413         if (dcont && (tmpin == dcont))
 414                 BIO_pop(cmsbio);
 415         BIO_free_all(cmsbio);
 416
 417         if (cms_certs)
 418                 sk_X509_pop_free(cms_certs, X509_free);
 419         if (crls)
 420                 sk_X509_CRL_pop_free(crls, X509_CRL_free);
 421
 422         return ret;
 423         }
 424
 425 CMS_ContentInfo *CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
 426                                                 BIO *data, unsigned int flags)
 427         {
 428         CMS_ContentInfo *cms;
 429         int i;
 430         cms = CMS_ContentInfo_new();
 431         if (!cms)
 432                 goto merr;
 433         if (pkey && !CMS_add1_signer(cms, signcert, pkey, NULL, flags))
 434                 {
 435                 CMSerr(CMS_F_CMS_SIGN, CMS_R_ADD_SIGNER_ERROR);
 436                 goto err;
 437                 }
 438         for (i = 0; i < sk_X509_num(certs); i++)
 439                 {
 440                 X509 *x = sk_X509_value(certs, i);
 441                 if (!CMS_add1_cert(cms, x))
 442                         goto merr;
 443                 }
 444         /* If no signer or certs initialize signedData */
 445         if (!pkey && !i && !CMS_SignedData_init(cms))
 446                 goto merr;
 447
 448         if(!(flags & CMS_DETACHED))
 449                 CMS_set_detached(cms, 0);
 450
 451         if ((flags & (CMS_STREAM|CMS_PARTIAL)) || CMS_final(cms, data, flags))
 452                 return cms;
 453
 454         return cms;
 455
 456         merr:
 457         CMSerr(CMS_F_CMS_SIGN, ERR_R_MALLOC_FAILURE);
 458
 459         err:
 460         if (cms)
 461                 CMS_ContentInfo_free(cms);
 462         return NULL;
 463         }
 464
 465 /* Placeholders for now... */
 466
 467 CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *in,
 468                                 const EVP_CIPHER *cipher, unsigned int flags)
 469         {
 470         return NULL;
 471         }
 472
 473 int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pkey, X509 *cert, BIO *data,
 474                                 unsigned int flags)
 475         {
 476         return 0;
 477         }
 478
 479 int CMS_final(CMS_ContentInfo *cms, BIO *data, int flags)
 480         {
 481         BIO *cmsbio;
 482         int ret = 0;
 483         if (!(cmsbio = CMS_dataInit(cms, NULL)))
 484                 {
 485                 CMSerr(CMS_F_CMS_FINAL,ERR_R_MALLOC_FAILURE);
 486                 return 0;
 487                 }
 488
 489         SMIME_crlf_copy(data, cmsbio, flags);
 490
 491         (void)BIO_flush(cmsbio);
 492
 493
 494         if (!CMS_dataFinal(cms, cmsbio))
 495                 {
 496                 CMSerr(CMS_F_CMS_FINAL,CMS_R_CMS_DATAFINAL_ERROR);
 497                 goto err;
 498                 }
 499
 500         ret = 1;
 501
 502         err:
 503         BIO_free_all(cmsbio);
 504
 505         return ret;
 506
 507         }
 508
 509 #ifdef ZLIB
 510
 511 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 512                                                         unsigned int flags)
 513         {
 514         BIO *cont;
 515         int r;
 516         if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_id_smime_ct_compressedData)
 517                 {
 518                 CMSerr(CMS_F_CMS_UNCOMPRESS,
 519                                         CMS_R_TYPE_NOT_COMPRESSED_DATA);
 520                 return 0;
 521                 }
 522
 523         if (!dcont)
 524                 {
 525                 ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
 526                 if (!pos || !*pos)
 527                         {
 528                         CMSerr(CMS_F_CMS_UNCOMPRESS, CMS_R_NO_CONTENT);
 529                         return 0;
 530                         }
 531                 }
 532
 533         cont = CMS_dataInit(cms, dcont);
 534         if (!cont)
 535                 return 0;
 536         r = cms_copy_content(out, cont, flags);
 537         BIO_free_all(cont);
 538         return r;
 539         }
 540
 541 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 542         {
 543         CMS_ContentInfo *cms;
 544         if (comp_nid <= 0)
 545                 comp_nid = NID_zlib_compression;
 546         cms = cms_CompressedData_create(comp_nid);
 547         if (!cms)
 548                 return NULL;
 549
 550         if(!(flags & CMS_DETACHED))
 551                 CMS_set_detached(cms, 0);
 552
 553         if ((flags & CMS_STREAM) || CMS_final(cms, in, flags))
 554                 return cms;
 555
 556         CMS_ContentInfo_free(cms);
 557         return NULL;
 558         }
 559
 560 #else
 561
 562 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 563                                                         unsigned int flags)
 564         {
 565         CMSerr(CMS_F_CMS_UNCOMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 566         return 0;
 567         }
 568
 569 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags)
 570         {
 571         CMSerr(CMS_F_CMS_COMPRESS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 572         return NULL;
 573         }
 574
 575 #endif