crypto/pkcs7/pk7_smime.c

   1 /* pk7_smime.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1999-2004 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  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 /* Simple PKCS#7 processing functions */
  60
  61 #include <stdio.h>
  62 #include "cryptlib.h"
  63 #include <openssl/x509.h>
  64 #include <openssl/x509v3.h>
  65
  66 PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
  67                   BIO *data, int flags)
  68 {
  69         PKCS7 *p7;
  70         PKCS7_SIGNER_INFO *si;
  71         BIO *p7bio;
  72         STACK_OF(X509_ALGOR) *smcap;
  73         int i;
  74
  75         if(!X509_check_private_key(signcert, pkey)) {
  76                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
  77                 return NULL;
  78         }
  79
  80         if(!(p7 = PKCS7_new())) {
  81                 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
  82                 return NULL;
  83         }
  84
  85         PKCS7_set_type(p7, NID_pkcs7_signed);
  86
  87         PKCS7_content_new(p7, NID_pkcs7_data);
  88
  89         if (!(si = PKCS7_add_signature(p7,signcert,pkey,EVP_sha1()))) {
  90                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
  91                 PKCS7_free(p7);
  92                 return NULL;
  93         }
  94
  95         if(!(flags & PKCS7_NOCERTS)) {
  96                 PKCS7_add_certificate(p7, signcert);
  97                 if(certs) for(i = 0; i < sk_X509_num(certs); i++)
  98                         PKCS7_add_certificate(p7, sk_X509_value(certs, i));
  99         }
 100
 101         if(!(flags & PKCS7_NOATTR)) {
 102                 PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
 103                                 V_ASN1_OBJECT, OBJ_nid2obj(NID_pkcs7_data));
 104                 /* Add SMIMECapabilities */
 105                 if(!(flags & PKCS7_NOSMIMECAP))
 106                 {
 107                 if(!(smcap = sk_X509_ALGOR_new_null())) {
 108                         PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
 109                         PKCS7_free(p7);
 110                         return NULL;
 111                 }
 112 #ifndef OPENSSL_NO_DES
 113                 PKCS7_simple_smimecap (smcap, NID_des_ede3_cbc, -1);
 114 #endif
 115 #ifndef OPENSSL_NO_RC2
 116                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 128);
 117                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 64);
 118 #endif
 119 #ifndef OPENSSL_NO_DES
 120                 PKCS7_simple_smimecap (smcap, NID_des_cbc, -1);
 121 #endif
 122 #ifndef OPENSSL_NO_RC2
 123                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 40);
 124 #endif
 125                 PKCS7_add_attrib_smimecap (si, smcap);
 126                 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 127                 }
 128         }
 129
 130         if (flags & PKCS7_STREAM)
 131                 return p7;
 132
 133         if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
 134                 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
 135                 PKCS7_free(p7);
 136                 return NULL;
 137         }
 138
 139         SMIME_crlf_copy(data, p7bio, flags);
 140
 141         if(flags & PKCS7_DETACHED)PKCS7_set_detached(p7, 1);
 142
 143         if (!PKCS7_dataFinal(p7,p7bio)) {
 144                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_DATASIGN);
 145                 PKCS7_free(p7);
 146                 BIO_free_all(p7bio);
 147                 return NULL;
 148         }
 149
 150         BIO_free_all(p7bio);
 151         return p7;
 152 }
 153
 154 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
 155                                         BIO *indata, BIO *out, int flags)
 156 {
 157         STACK_OF(X509) *signers;
 158         X509 *signer;
 159         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 160         PKCS7_SIGNER_INFO *si;
 161         X509_STORE_CTX cert_ctx;
 162         char buf[4096];
 163         int i, j=0, k, ret = 0;
 164         BIO *p7bio;
 165         BIO *tmpin, *tmpout;
 166
 167         if(!p7) {
 168                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
 169                 return 0;
 170         }
 171
 172         if(!PKCS7_type_is_signed(p7)) {
 173                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
 174                 return 0;
 175         }
 176
 177         /* Check for no data and no content: no data to verify signature */
 178         if(PKCS7_get_detached(p7) && !indata) {
 179                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
 180                 return 0;
 181         }
 182 #if 0
 183         /* NB: this test commented out because some versions of Netscape
 184          * illegally include zero length content when signing data.
 185          */
 186
 187         /* Check for data and content: two sets of data */
 188         if(!PKCS7_get_detached(p7) && indata) {
 189                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
 190                 return 0;
 191         }
 192 #endif
 193
 194         sinfos = PKCS7_get_signer_info(p7);
 195
 196         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
 197                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
 198                 return 0;
 199         }
 200
 201
 202         signers = PKCS7_get0_signers(p7, certs, flags);
 203
 204         if(!signers) return 0;
 205
 206         /* Now verify the certificates */
 207
 208         if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) {
 209                 signer = sk_X509_value (signers, k);
 210                 if (!(flags & PKCS7_NOCHAIN)) {
 211                         if(!X509_STORE_CTX_init(&cert_ctx, store, signer,
 212                                                         p7->d.sign->cert))
 213                                 {
 214                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 215                                 sk_X509_free(signers);
 216                                 return 0;
 217                                 }
 218                         X509_STORE_CTX_set_purpose(&cert_ctx,
 219                                                 X509_PURPOSE_SMIME_SIGN);
 220                 } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) {
 221                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 222                         sk_X509_free(signers);
 223                         return 0;
 224                 }
 225                 if (!(flags & PKCS7_NOCRL))
 226                         X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
 227                 i = X509_verify_cert(&cert_ctx);
 228                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
 229                 X509_STORE_CTX_cleanup(&cert_ctx);
 230                 if (i <= 0) {
 231                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
 232                         ERR_add_error_data(2, "Verify error:",
 233                                          X509_verify_cert_error_string(j));
 234                         sk_X509_free(signers);
 235                         return 0;
 236                 }
 237                 /* Check for revocation status here */
 238         }
 239
 240         /* Performance optimization: if the content is a memory BIO then
 241          * store its contents in a temporary read only memory BIO. This
 242          * avoids potentially large numbers of slow copies of data which will
 243          * occur when reading from a read write memory BIO when signatures
 244          * are calculated.
 245          */
 246
 247         if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))
 248                 {
 249                 char *ptr;
 250                 long len;
 251                 len = BIO_get_mem_data(indata, &ptr);
 252                 tmpin = BIO_new_mem_buf(ptr, len);
 253                 if (tmpin == NULL)
 254                         {
 255                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 256                         return 0;
 257                         }
 258                 }
 259         else
 260                 tmpin = indata;
 261
 262
 263         p7bio=PKCS7_dataInit(p7,tmpin);
 264
 265         if(flags & PKCS7_TEXT) {
 266                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
 267                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 268                         goto err;
 269                 }
 270         } else tmpout = out;
 271
 272         /* We now have to 'read' from p7bio to calculate digests etc. */
 273         for (;;)
 274         {
 275                 i=BIO_read(p7bio,buf,sizeof(buf));
 276                 if (i <= 0) break;
 277                 if (tmpout) BIO_write(tmpout, buf, i);
 278         }
 279
 280         if(flags & PKCS7_TEXT) {
 281                 if(!SMIME_text(tmpout, out)) {
 282                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
 283                         BIO_free(tmpout);
 284                         goto err;
 285                 }
 286                 BIO_free(tmpout);
 287         }
 288
 289         /* Now Verify All Signatures */
 290         if (!(flags & PKCS7_NOSIGS))
 291             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 292                 {
 293                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
 294                 signer = sk_X509_value (signers, i);
 295                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
 296                 if (j <= 0) {
 297                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
 298                         goto err;
 299                 }
 300         }
 301
 302         ret = 1;
 303
 304         err:
 305
 306         if (tmpin == indata)
 307                 {
 308                 if (indata) BIO_pop(p7bio);
 309                 }
 310         BIO_free_all(p7bio);
 311
 312         sk_X509_free(signers);
 313
 314         return ret;
 315 }
 316
 317 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
 318 {
 319         STACK_OF(X509) *signers;
 320         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 321         PKCS7_SIGNER_INFO *si;
 322         PKCS7_ISSUER_AND_SERIAL *ias;
 323         X509 *signer;
 324         int i;
 325
 326         if(!p7) {
 327                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
 328                 return NULL;
 329         }
 330
 331         if(!PKCS7_type_is_signed(p7)) {
 332                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
 333                 return NULL;
 334         }
 335
 336         /* Collect all the signers together */
 337
 338         sinfos = PKCS7_get_signer_info(p7);
 339
 340         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
 341                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
 342                 return 0;
 343         }
 344
 345         if(!(signers = sk_X509_new_null())) {
 346                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
 347                 return NULL;
 348         }
 349
 350         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 351         {
 352             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 353             ias = si->issuer_and_serial;
 354             signer = NULL;
 355                 /* If any certificates passed they take priority */
 356             if (certs) signer = X509_find_by_issuer_and_serial (certs,
 357                                                 ias->issuer, ias->serial);
 358             if (!signer && !(flags & PKCS7_NOINTERN)
 359                         && p7->d.sign->cert) signer =
 360                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
 361                                                 ias->issuer, ias->serial);
 362             if (!signer) {
 363                         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
 364                         sk_X509_free(signers);
 365                         return 0;
 366             }
 367
 368             sk_X509_push(signers, signer);
 369         }
 370         return signers;
 371 }
 372
 373
 374 /* Build a complete PKCS#7 enveloped data */
 375
 376 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
 377                                                                 int flags)
 378 {
 379         PKCS7 *p7;
 380         BIO *p7bio = NULL;
 381         int i;
 382         X509 *x509;
 383         if(!(p7 = PKCS7_new())) {
 384                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 385                 return NULL;
 386         }
 387
 388         PKCS7_set_type(p7, NID_pkcs7_enveloped);
 389         if(!PKCS7_set_cipher(p7, cipher)) {
 390                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
 391                 goto err;
 392         }
 393
 394         for(i = 0; i < sk_X509_num(certs); i++) {
 395                 x509 = sk_X509_value(certs, i);
 396                 if(!PKCS7_add_recipient(p7, x509)) {
 397                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
 398                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
 399                         goto err;
 400                 }
 401         }
 402
 403         if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
 404                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 405                 goto err;
 406         }
 407
 408         SMIME_crlf_copy(in, p7bio, flags);
 409
 410         BIO_flush(p7bio);
 411
 412         if (!PKCS7_dataFinal(p7,p7bio)) {
 413                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
 414                 goto err;
 415         }
 416         BIO_free_all(p7bio);
 417
 418         return p7;
 419
 420         err:
 421
 422         BIO_free(p7bio);
 423         PKCS7_free(p7);
 424         return NULL;
 425
 426 }
 427
 428 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
 429 {
 430         BIO *tmpmem;
 431         int ret, i;
 432         char buf[4096];
 433
 434         if(!p7) {
 435                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
 436                 return 0;
 437         }
 438
 439         if(!PKCS7_type_is_enveloped(p7)) {
 440                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
 441                 return 0;
 442         }
 443
 444         if(cert && !X509_check_private_key(cert, pkey)) {
 445                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
 446                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 447                 return 0;
 448         }
 449
 450         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
 451                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
 452                 return 0;
 453         }
 454
 455         if (flags & PKCS7_TEXT) {
 456                 BIO *tmpbuf, *bread;
 457                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
 458                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
 459                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 460                         return 0;
 461                 }
 462                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
 463                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 464                         return 0;
 465                 }
 466                 ret = SMIME_text(bread, data);
 467                 BIO_free_all(bread);
 468                 return ret;
 469         } else {
 470                 for(;;) {
 471                         i = BIO_read(tmpmem, buf, sizeof(buf));
 472                         if(i <= 0) break;
 473                         BIO_write(data, buf, i);
 474                 }
 475                 BIO_free_all(tmpmem);
 476                 return 1;
 477         }
 478 }