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_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_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_signed_attribute(si, NID_pkcs9_contentType,
 183                                 V_ASN1_OBJECT, OBJ_nid2obj(NID_pkcs7_data)))
 184                         goto err;
 185                 /* Add SMIMECapabilities */
 186                 if(!(flags & PKCS7_NOSMIMECAP))
 187                         {
 188                         if(!(smcap = sk_X509_ALGOR_new_null()))
 189                                 {
 190                                 PKCS7err(PKCS7_F_PKCS7_ADD_SIGNER,
 191                                         ERR_R_MALLOC_FAILURE);
 192                                 goto err;
 193                                 }
 194                         if (!add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
 195                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
 196                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
 197                                 || !add_cipher_smcap(smcap, NID_des_cbc, -1)
 198                                 || !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
 199                                 || !PKCS7_add_attrib_smimecap (si, smcap))
 200                                 goto err;
 201                         sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 202                         }
 203                 }
 204         return si;
 205         err:
 206         if (smcap)
 207                 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 208         if (si && si_free)
 209                 PKCS7_SIGNER_INFO_free(si);
 210         return NULL;
 211         }
 212
 213 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
 214                                         BIO *indata, BIO *out, int flags)
 215 {
 216         STACK_OF(X509) *signers;
 217         X509 *signer;
 218         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 219         PKCS7_SIGNER_INFO *si;
 220         X509_STORE_CTX cert_ctx;
 221         char buf[4096];
 222         int i, j=0, k, ret = 0;
 223         BIO *p7bio;
 224         BIO *tmpin, *tmpout;
 225
 226         if(!p7) {
 227                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
 228                 return 0;
 229         }
 230
 231         if(!PKCS7_type_is_signed(p7)) {
 232                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
 233                 return 0;
 234         }
 235
 236         /* Check for no data and no content: no data to verify signature */
 237         if(PKCS7_get_detached(p7) && !indata) {
 238                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
 239                 return 0;
 240         }
 241 #if 0
 242         /* NB: this test commented out because some versions of Netscape
 243          * illegally include zero length content when signing data.
 244          */
 245
 246         /* Check for data and content: two sets of data */
 247         if(!PKCS7_get_detached(p7) && indata) {
 248                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
 249                 return 0;
 250         }
 251 #endif
 252
 253         sinfos = PKCS7_get_signer_info(p7);
 254
 255         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
 256                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
 257                 return 0;
 258         }
 259
 260
 261         signers = PKCS7_get0_signers(p7, certs, flags);
 262
 263         if(!signers) return 0;
 264
 265         /* Now verify the certificates */
 266
 267         if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) {
 268                 signer = sk_X509_value (signers, k);
 269                 if (!(flags & PKCS7_NOCHAIN)) {
 270                         if(!X509_STORE_CTX_init(&cert_ctx, store, signer,
 271                                                         p7->d.sign->cert))
 272                                 {
 273                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 274                                 sk_X509_free(signers);
 275                                 return 0;
 276                                 }
 277                         X509_STORE_CTX_set_purpose(&cert_ctx,
 278                                                 X509_PURPOSE_SMIME_SIGN);
 279                 } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) {
 280                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 281                         sk_X509_free(signers);
 282                         return 0;
 283                 }
 284                 if (!(flags & PKCS7_NOCRL))
 285                         X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
 286                 i = X509_verify_cert(&cert_ctx);
 287                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
 288                 X509_STORE_CTX_cleanup(&cert_ctx);
 289                 if (i <= 0) {
 290                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
 291                         ERR_add_error_data(2, "Verify error:",
 292                                          X509_verify_cert_error_string(j));
 293                         sk_X509_free(signers);
 294                         return 0;
 295                 }
 296                 /* Check for revocation status here */
 297         }
 298
 299         /* Performance optimization: if the content is a memory BIO then
 300          * store its contents in a temporary read only memory BIO. This
 301          * avoids potentially large numbers of slow copies of data which will
 302          * occur when reading from a read write memory BIO when signatures
 303          * are calculated.
 304          */
 305
 306         if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))
 307                 {
 308                 char *ptr;
 309                 long len;
 310                 len = BIO_get_mem_data(indata, &ptr);
 311                 tmpin = BIO_new_mem_buf(ptr, len);
 312                 if (tmpin == NULL)
 313                         {
 314                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 315                         return 0;
 316                         }
 317                 }
 318         else
 319                 tmpin = indata;
 320
 321
 322         p7bio=PKCS7_dataInit(p7,tmpin);
 323
 324         if(flags & PKCS7_TEXT) {
 325                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
 326                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 327                         goto err;
 328                 }
 329         } else tmpout = out;
 330
 331         /* We now have to 'read' from p7bio to calculate digests etc. */
 332         for (;;)
 333         {
 334                 i=BIO_read(p7bio,buf,sizeof(buf));
 335                 if (i <= 0) break;
 336                 if (tmpout) BIO_write(tmpout, buf, i);
 337         }
 338
 339         if(flags & PKCS7_TEXT) {
 340                 if(!SMIME_text(tmpout, out)) {
 341                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
 342                         BIO_free(tmpout);
 343                         goto err;
 344                 }
 345                 BIO_free(tmpout);
 346         }
 347
 348         /* Now Verify All Signatures */
 349         if (!(flags & PKCS7_NOSIGS))
 350             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 351                 {
 352                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
 353                 signer = sk_X509_value (signers, i);
 354                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
 355                 if (j <= 0) {
 356                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
 357                         goto err;
 358                 }
 359         }
 360
 361         ret = 1;
 362
 363         err:
 364
 365         if (tmpin == indata)
 366                 {
 367                 if (indata) BIO_pop(p7bio);
 368                 }
 369         BIO_free_all(p7bio);
 370
 371         sk_X509_free(signers);
 372
 373         return ret;
 374 }
 375
 376 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
 377 {
 378         STACK_OF(X509) *signers;
 379         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 380         PKCS7_SIGNER_INFO *si;
 381         PKCS7_ISSUER_AND_SERIAL *ias;
 382         X509 *signer;
 383         int i;
 384
 385         if(!p7) {
 386                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
 387                 return NULL;
 388         }
 389
 390         if(!PKCS7_type_is_signed(p7)) {
 391                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
 392                 return NULL;
 393         }
 394
 395         /* Collect all the signers together */
 396
 397         sinfos = PKCS7_get_signer_info(p7);
 398
 399         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
 400                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
 401                 return 0;
 402         }
 403
 404         if(!(signers = sk_X509_new_null())) {
 405                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
 406                 return NULL;
 407         }
 408
 409         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 410         {
 411             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 412             ias = si->issuer_and_serial;
 413             signer = NULL;
 414                 /* If any certificates passed they take priority */
 415             if (certs) signer = X509_find_by_issuer_and_serial (certs,
 416                                                 ias->issuer, ias->serial);
 417             if (!signer && !(flags & PKCS7_NOINTERN)
 418                         && p7->d.sign->cert) signer =
 419                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
 420                                                 ias->issuer, ias->serial);
 421             if (!signer) {
 422                         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
 423                         sk_X509_free(signers);
 424                         return 0;
 425             }
 426
 427             sk_X509_push(signers, signer);
 428         }
 429         return signers;
 430 }
 431
 432
 433 /* Build a complete PKCS#7 enveloped data */
 434
 435 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
 436                                                                 int flags)
 437 {
 438         PKCS7 *p7;
 439         BIO *p7bio = NULL;
 440         int i;
 441         X509 *x509;
 442         if(!(p7 = PKCS7_new())) {
 443                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 444                 return NULL;
 445         }
 446
 447         PKCS7_set_type(p7, NID_pkcs7_enveloped);
 448         if(!PKCS7_set_cipher(p7, cipher)) {
 449                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
 450                 goto err;
 451         }
 452
 453         for(i = 0; i < sk_X509_num(certs); i++) {
 454                 x509 = sk_X509_value(certs, i);
 455                 if(!PKCS7_add_recipient(p7, x509)) {
 456                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
 457                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
 458                         goto err;
 459                 }
 460         }
 461
 462         if (PKCS7_final(p7, in, flags))
 463                 return p7;
 464
 465         err:
 466
 467         BIO_free(p7bio);
 468         PKCS7_free(p7);
 469         return NULL;
 470
 471 }
 472
 473 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
 474 {
 475         BIO *tmpmem;
 476         int ret, i;
 477         char buf[4096];
 478
 479         if(!p7) {
 480                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
 481                 return 0;
 482         }
 483
 484         if(!PKCS7_type_is_enveloped(p7)) {
 485                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
 486                 return 0;
 487         }
 488
 489         if(cert && !X509_check_private_key(cert, pkey)) {
 490                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
 491                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 492                 return 0;
 493         }
 494
 495         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
 496                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
 497                 return 0;
 498         }
 499
 500         if (flags & PKCS7_TEXT) {
 501                 BIO *tmpbuf, *bread;
 502                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
 503                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
 504                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 505                         return 0;
 506                 }
 507                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
 508                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 509                         return 0;
 510                 }
 511                 ret = SMIME_text(bread, data);
 512                 BIO_free_all(bread);
 513                 return ret;
 514         } else {
 515                 for(;;) {
 516                         i = BIO_read(tmpmem, buf, sizeof(buf));
 517                         if(i <= 0) break;
 518                         BIO_write(data, buf, i);
 519                 }
 520                 BIO_free_all(tmpmem);
 521                 return 1;
 522         }
 523 }