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         int i;
  71
  72         if(!(p7 = PKCS7_new()))
  73                 {
  74                 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
  75                 return NULL;
  76                 }
  77
  78         if (!PKCS7_set_type(p7, NID_pkcs7_signed))
  79                 goto err;
  80
  81         if (!PKCS7_content_new(p7, NID_pkcs7_data))
  82                 goto err;
  83
  84         if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags))
  85                 {
  86                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
  87                 goto err;
  88                 }
  89
  90         if(!(flags & PKCS7_NOCERTS))
  91                 {
  92                 for(i = 0; i < sk_X509_num(certs); i++)
  93                         {
  94                         if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
  95                                 goto err;
  96                         }
  97                 }
  98
  99         if (flags & (PKCS7_STREAM|PKCS7_PARTIAL))
 100                 return p7;
 101
 102         if (PKCS7_final(p7, data, flags))
 103                 return p7;
 104
 105         err:
 106         PKCS7_free(p7);
 107         return NULL;
 108 }
 109
 110 int PKCS7_final(PKCS7 *p7, BIO *data, int flags)
 111         {
 112         BIO *p7bio;
 113         int ret;
 114         if (!(p7bio = PKCS7_dataInit(p7, NULL)))
 115                 {
 116                 PKCS7err(PKCS7_F_PKCS7_FINAL,ERR_R_MALLOC_FAILURE);
 117                 return 0;
 118                 }
 119
 120         SMIME_crlf_copy(data, p7bio, flags);
 121
 122         if(PKCS7_type_is_signed(p7) && (flags & PKCS7_DETACHED))
 123                 PKCS7_set_detached(p7, 1);
 124
 125         if (!PKCS7_dataFinal(p7,p7bio))
 126                 {
 127                 PKCS7err(PKCS7_F_PKCS7_FINAL,PKCS7_R_PKCS7_DATASIGN);
 128                 goto err;
 129                 }
 130
 131         ret = 1;
 132
 133         err:
 134         BIO_free_all(p7bio);
 135
 136         return ret;
 137
 138         }
 139
 140 /* Check to see if a cipher exists and if so add S/MIME capabilities */
 141
 142 static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
 143         {
 144         if (EVP_get_cipherbynid(nid))
 145                 return PKCS7_simple_smimecap(sk, nid, arg);
 146         return 1;
 147         }
 148
 149 PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert,
 150                                         EVP_PKEY *pkey, const EVP_MD *md,
 151                                         int flags)
 152         {
 153         PKCS7_SIGNER_INFO *si = NULL;
 154         int si_free = 1;
 155         STACK_OF(X509_ALGOR) *smcap = NULL;
 156         if(!X509_check_private_key(signcert, pkey))
 157                 {
 158                 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
 159                         PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 160                 return NULL;
 161                 }
 162
 163         if (!(si = PKCS7_add_signature(p7,signcert,pkey, md)))
 164                 {
 165                 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
 166                                 PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
 167                 return NULL;
 168                 }
 169
 170         /* si is now part of p7 so don't free it on error */
 171
 172         si_free = 0;
 173
 174         if(!(flags & PKCS7_NOCERTS))
 175                 {
 176                 if (!PKCS7_add_certificate(p7, signcert))
 177                         goto err;
 178                 }
 179
 180         if(!(flags & PKCS7_NOATTR))
 181                 {
 182                 if (!PKCS7_add_attrib_content_type(si, NULL))
 183                         goto err;
 184                 /* Add SMIMECapabilities */
 185                 if(!(flags & PKCS7_NOSMIMECAP))
 186                         {
 187                         if(!(smcap = sk_X509_ALGOR_new_null()))
 188                                 {
 189                                 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
 190                                         ERR_R_MALLOC_FAILURE);
 191                                 goto err;
 192                                 }
 193                         if (!add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
 194                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
 195                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
 196                                 || !add_cipher_smcap(smcap, NID_des_cbc, -1)
 197                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
 198                                 || !PKCS7_add_attrib_smimecap (si, smcap))
 199                                 goto err;
 200                         sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 201                         }
 202                 }
 203         return si;
 204         err:
 205         if (smcap)
 206                 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 207         if (si && si_free)
 208                 PKCS7_SIGNER_INFO_free(si);
 209         return NULL;
 210         }
 211
 212 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
 213                                         BIO *indata, BIO *out, int flags)
 214 {
 215         STACK_OF(X509) *signers;
 216         X509 *signer;
 217         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 218         PKCS7_SIGNER_INFO *si;
 219         X509_STORE_CTX cert_ctx;
 220         char buf[4096];
 221         int i, j=0, k, ret = 0;
 222         BIO *p7bio;
 223         BIO *tmpin, *tmpout;
 224
 225         if(!p7) {
 226                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
 227                 return 0;
 228         }
 229
 230         if(!PKCS7_type_is_signed(p7)) {
 231                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
 232                 return 0;
 233         }
 234
 235         /* Check for no data and no content: no data to verify signature */
 236         if(PKCS7_get_detached(p7) && !indata) {
 237                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
 238                 return 0;
 239         }
 240 #if 0
 241         /* NB: this test commented out because some versions of Netscape
 242          * illegally include zero length content when signing data.
 243          */
 244
 245         /* Check for data and content: two sets of data */
 246         if(!PKCS7_get_detached(p7) && indata) {
 247                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
 248                 return 0;
 249         }
 250 #endif
 251
 252         sinfos = PKCS7_get_signer_info(p7);
 253
 254         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
 255                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
 256                 return 0;
 257         }
 258
 259
 260         signers = PKCS7_get0_signers(p7, certs, flags);
 261
 262         if(!signers) return 0;
 263
 264         /* Now verify the certificates */
 265
 266         if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) {
 267                 signer = sk_X509_value (signers, k);
 268                 if (!(flags & PKCS7_NOCHAIN)) {
 269                         if(!X509_STORE_CTX_init(&cert_ctx, store, signer,
 270                                                         p7->d.sign->cert))
 271                                 {
 272                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 273                                 sk_X509_free(signers);
 274                                 return 0;
 275                                 }
 276                         X509_STORE_CTX_set_purpose(&cert_ctx,
 277                                                 X509_PURPOSE_SMIME_SIGN);
 278                 } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) {
 279                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 280                         sk_X509_free(signers);
 281                         return 0;
 282                 }
 283                 if (!(flags & PKCS7_NOCRL))
 284                         X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
 285                 i = X509_verify_cert(&cert_ctx);
 286                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
 287                 X509_STORE_CTX_cleanup(&cert_ctx);
 288                 if (i <= 0) {
 289                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
 290                         ERR_add_error_data(2, "Verify error:",
 291                                          X509_verify_cert_error_string(j));
 292                         sk_X509_free(signers);
 293                         return 0;
 294                 }
 295                 /* Check for revocation status here */
 296         }
 297
 298         /* Performance optimization: if the content is a memory BIO then
 299          * store its contents in a temporary read only memory BIO. This
 300          * avoids potentially large numbers of slow copies of data which will
 301          * occur when reading from a read write memory BIO when signatures
 302          * are calculated.
 303          */
 304
 305         if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))
 306                 {
 307                 char *ptr;
 308                 long len;
 309                 len = BIO_get_mem_data(indata, &ptr);
 310                 tmpin = BIO_new_mem_buf(ptr, len);
 311                 if (tmpin == NULL)
 312                         {
 313                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 314                         return 0;
 315                         }
 316                 }
 317         else
 318                 tmpin = indata;
 319
 320
 321         p7bio=PKCS7_dataInit(p7,tmpin);
 322
 323         if(flags & PKCS7_TEXT) {
 324                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
 325                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 326                         goto err;
 327                 }
 328         } else tmpout = out;
 329
 330         /* We now have to 'read' from p7bio to calculate digests etc. */
 331         for (;;)
 332         {
 333                 i=BIO_read(p7bio,buf,sizeof(buf));
 334                 if (i <= 0) break;
 335                 if (tmpout) BIO_write(tmpout, buf, i);
 336         }
 337
 338         if(flags & PKCS7_TEXT) {
 339                 if(!SMIME_text(tmpout, out)) {
 340                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
 341                         BIO_free(tmpout);
 342                         goto err;
 343                 }
 344                 BIO_free(tmpout);
 345         }
 346
 347         /* Now Verify All Signatures */
 348         if (!(flags & PKCS7_NOSIGS))
 349             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 350                 {
 351                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
 352                 signer = sk_X509_value (signers, i);
 353                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
 354                 if (j <= 0) {
 355                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
 356                         goto err;
 357                 }
 358         }
 359
 360         ret = 1;
 361
 362         err:
 363
 364         if (tmpin == indata)
 365                 {
 366                 if (indata) BIO_pop(p7bio);
 367                 }
 368         BIO_free_all(p7bio);
 369
 370         sk_X509_free(signers);
 371
 372         return ret;
 373 }
 374
 375 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
 376 {
 377         STACK_OF(X509) *signers;
 378         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 379         PKCS7_SIGNER_INFO *si;
 380         PKCS7_ISSUER_AND_SERIAL *ias;
 381         X509 *signer;
 382         int i;
 383
 384         if(!p7) {
 385                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
 386                 return NULL;
 387         }
 388
 389         if(!PKCS7_type_is_signed(p7)) {
 390                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
 391                 return NULL;
 392         }
 393
 394         /* Collect all the signers together */
 395
 396         sinfos = PKCS7_get_signer_info(p7);
 397
 398         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
 399                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
 400                 return 0;
 401         }
 402
 403         if(!(signers = sk_X509_new_null())) {
 404                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
 405                 return NULL;
 406         }
 407
 408         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 409         {
 410             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 411             ias = si->issuer_and_serial;
 412             signer = NULL;
 413                 /* If any certificates passed they take priority */
 414             if (certs) signer = X509_find_by_issuer_and_serial (certs,
 415                                                 ias->issuer, ias->serial);
 416             if (!signer && !(flags & PKCS7_NOINTERN)
 417                         && p7->d.sign->cert) signer =
 418                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
 419                                                 ias->issuer, ias->serial);
 420             if (!signer) {
 421                         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
 422                         sk_X509_free(signers);
 423                         return 0;
 424             }
 425
 426             sk_X509_push(signers, signer);
 427         }
 428         return signers;
 429 }
 430
 431
 432 /* Build a complete PKCS#7 enveloped data */
 433
 434 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
 435                                                                 int flags)
 436 {
 437         PKCS7 *p7;
 438         BIO *p7bio = NULL;
 439         int i;
 440         X509 *x509;
 441         if(!(p7 = PKCS7_new())) {
 442                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 443                 return NULL;
 444         }
 445
 446         PKCS7_set_type(p7, NID_pkcs7_enveloped);
 447         if(!PKCS7_set_cipher(p7, cipher)) {
 448                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
 449                 goto err;
 450         }
 451
 452         for(i = 0; i < sk_X509_num(certs); i++) {
 453                 x509 = sk_X509_value(certs, i);
 454                 if(!PKCS7_add_recipient(p7, x509)) {
 455                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
 456                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
 457                         goto err;
 458                 }
 459         }
 460
 461         if (PKCS7_final(p7, in, flags))
 462                 return p7;
 463
 464         err:
 465
 466         BIO_free(p7bio);
 467         PKCS7_free(p7);
 468         return NULL;
 469
 470 }
 471
 472 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
 473 {
 474         BIO *tmpmem;
 475         int ret, i;
 476         char buf[4096];
 477
 478         if(!p7) {
 479                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
 480                 return 0;
 481         }
 482
 483         if(!PKCS7_type_is_enveloped(p7)) {
 484                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
 485                 return 0;
 486         }
 487
 488         if(cert && !X509_check_private_key(cert, pkey)) {
 489                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
 490                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 491                 return 0;
 492         }
 493
 494         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
 495                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
 496                 return 0;
 497         }
 498
 499         if (flags & PKCS7_TEXT) {
 500                 BIO *tmpbuf, *bread;
 501                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
 502                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
 503                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 504                         return 0;
 505                 }
 506                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
 507                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 508                         return 0;
 509                 }
 510                 ret = SMIME_text(bread, data);
 511                 BIO_free_all(bread);
 512                 return ret;
 513         } else {
 514                 for(;;) {
 515                         i = BIO_read(tmpmem, buf, sizeof(buf));
 516                         if(i <= 0) break;
 517                         BIO_write(data, buf, i);
 518                 }
 519                 BIO_free_all(tmpmem);
 520                 return 1;
 521         }
 522 }