crypto/openssl/crypto/pkcs7/pk7_smime.c

   1 /* pk7_smime.c */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) 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 = NULL;
  70         PKCS7_SIGNER_INFO *si;
  71         BIO *p7bio = NULL;
  72         STACK_OF(X509_ALGOR) *smcap = NULL;
  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         if (!PKCS7_set_type(p7, NID_pkcs7_signed))
  86                 goto err;
  87
  88         if (!PKCS7_content_new(p7, NID_pkcs7_data))
  89                 goto err;
  90
  91         if (!(si = PKCS7_add_signature(p7,signcert,pkey,EVP_sha1()))) {
  92                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
  93                 goto err;
  94         }
  95
  96         if(!(flags & PKCS7_NOCERTS)) {
  97                 if (!PKCS7_add_certificate(p7, signcert))
  98                         goto err;
  99                 if(certs) for(i = 0; i < sk_X509_num(certs); i++)
 100                         if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
 101                                 goto err;
 102         }
 103
 104         if(!(flags & PKCS7_NOATTR)) {
 105                 if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
 106                                 V_ASN1_OBJECT, OBJ_nid2obj(NID_pkcs7_data)))
 107                         goto err;
 108                 /* Add SMIMECapabilities */
 109                 if(!(flags & PKCS7_NOSMIMECAP))
 110                 {
 111                 if(!(smcap = sk_X509_ALGOR_new_null())) {
 112                         PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
 113                         goto err;
 114                 }
 115 #ifndef OPENSSL_NO_DES
 116                 if (!PKCS7_simple_smimecap (smcap, NID_des_ede3_cbc, -1))
 117                         goto err;
 118 #endif
 119 #ifndef OPENSSL_NO_RC2
 120                 if (!PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 128))
 121                         goto err;
 122                 if (!PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 64))
 123                         goto err;
 124 #endif
 125 #ifndef OPENSSL_NO_DES
 126                 if (!PKCS7_simple_smimecap (smcap, NID_des_cbc, -1))
 127                         goto err;
 128 #endif
 129 #ifndef OPENSSL_NO_RC2
 130                 if (!PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 40))
 131                         goto err;
 132 #endif
 133                 if (!PKCS7_add_attrib_smimecap (si, smcap))
 134                         goto err;
 135                 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 136                 smcap = NULL;
 137                 }
 138         }
 139
 140         if(flags & PKCS7_DETACHED)PKCS7_set_detached(p7, 1);
 141
 142         if (flags & PKCS7_STREAM)
 143                 return p7;
 144
 145
 146         if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
 147                 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
 148                 goto err;
 149         }
 150
 151         SMIME_crlf_copy(data, p7bio, flags);
 152
 153
 154         if (!PKCS7_dataFinal(p7,p7bio)) {
 155                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_DATASIGN);
 156                 goto err;
 157         }
 158
 159         BIO_free_all(p7bio);
 160         return p7;
 161 err:
 162         sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 163         BIO_free_all(p7bio);
 164         PKCS7_free(p7);
 165         return NULL;
 166 }
 167
 168 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
 169                                         BIO *indata, BIO *out, int flags)
 170 {
 171         STACK_OF(X509) *signers;
 172         X509 *signer;
 173         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 174         PKCS7_SIGNER_INFO *si;
 175         X509_STORE_CTX cert_ctx;
 176         char buf[4096];
 177         int i, j=0, k, ret = 0;
 178         BIO *p7bio;
 179         BIO *tmpin, *tmpout;
 180
 181         if(!p7) {
 182                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
 183                 return 0;
 184         }
 185
 186         if(!PKCS7_type_is_signed(p7)) {
 187                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
 188                 return 0;
 189         }
 190
 191         /* Check for no data and no content: no data to verify signature */
 192         if(PKCS7_get_detached(p7) && !indata) {
 193                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
 194                 return 0;
 195         }
 196 #if 0
 197         /* NB: this test commented out because some versions of Netscape
 198          * illegally include zero length content when signing data.
 199          */
 200
 201         /* Check for data and content: two sets of data */
 202         if(!PKCS7_get_detached(p7) && indata) {
 203                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
 204                 return 0;
 205         }
 206 #endif
 207
 208         sinfos = PKCS7_get_signer_info(p7);
 209
 210         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
 211                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
 212                 return 0;
 213         }
 214
 215
 216         signers = PKCS7_get0_signers(p7, certs, flags);
 217
 218         if(!signers) return 0;
 219
 220         /* Now verify the certificates */
 221
 222         if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) {
 223                 signer = sk_X509_value (signers, k);
 224                 if (!(flags & PKCS7_NOCHAIN)) {
 225                         if(!X509_STORE_CTX_init(&cert_ctx, store, signer,
 226                                                         p7->d.sign->cert))
 227                                 {
 228                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 229                                 sk_X509_free(signers);
 230                                 return 0;
 231                                 }
 232                         X509_STORE_CTX_set_default(&cert_ctx, "smime_sign");
 233                 } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) {
 234                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 235                         sk_X509_free(signers);
 236                         return 0;
 237                 }
 238                 if (!(flags & PKCS7_NOCRL))
 239                         X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
 240                 i = X509_verify_cert(&cert_ctx);
 241                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
 242                 X509_STORE_CTX_cleanup(&cert_ctx);
 243                 if (i <= 0) {
 244                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
 245                         ERR_add_error_data(2, "Verify error:",
 246                                          X509_verify_cert_error_string(j));
 247                         sk_X509_free(signers);
 248                         return 0;
 249                 }
 250                 /* Check for revocation status here */
 251         }
 252
 253         /* Performance optimization: if the content is a memory BIO then
 254          * store its contents in a temporary read only memory BIO. This
 255          * avoids potentially large numbers of slow copies of data which will
 256          * occur when reading from a read write memory BIO when signatures
 257          * are calculated.
 258          */
 259
 260         if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))
 261                 {
 262                 char *ptr;
 263                 long len;
 264                 len = BIO_get_mem_data(indata, &ptr);
 265                 tmpin = BIO_new_mem_buf(ptr, len);
 266                 if (tmpin == NULL)
 267                         {
 268                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 269                         return 0;
 270                         }
 271                 }
 272         else
 273                 tmpin = indata;
 274
 275
 276         if (!(p7bio=PKCS7_dataInit(p7,tmpin)))
 277                 goto err;
 278
 279         if(flags & PKCS7_TEXT) {
 280                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
 281                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 282                         goto err;
 283                 }
 284                 BIO_set_mem_eof_return(tmpout, 0);
 285         } else tmpout = out;
 286
 287         /* We now have to 'read' from p7bio to calculate digests etc. */
 288         for (;;)
 289         {
 290                 i=BIO_read(p7bio,buf,sizeof(buf));
 291                 if (i <= 0) break;
 292                 if (tmpout) BIO_write(tmpout, buf, i);
 293         }
 294
 295         if(flags & PKCS7_TEXT) {
 296                 if(!SMIME_text(tmpout, out)) {
 297                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
 298                         BIO_free(tmpout);
 299                         goto err;
 300                 }
 301                 BIO_free(tmpout);
 302         }
 303
 304         /* Now Verify All Signatures */
 305         if (!(flags & PKCS7_NOSIGS))
 306             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 307                 {
 308                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
 309                 signer = sk_X509_value (signers, i);
 310                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
 311                 if (j <= 0) {
 312                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
 313                         goto err;
 314                 }
 315         }
 316
 317         ret = 1;
 318
 319         err:
 320
 321         if (tmpin == indata)
 322                 {
 323                 if (indata) BIO_pop(p7bio);
 324                 }
 325         BIO_free_all(p7bio);
 326
 327         sk_X509_free(signers);
 328
 329         return ret;
 330 }
 331
 332 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
 333 {
 334         STACK_OF(X509) *signers;
 335         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 336         PKCS7_SIGNER_INFO *si;
 337         PKCS7_ISSUER_AND_SERIAL *ias;
 338         X509 *signer;
 339         int i;
 340
 341         if(!p7) {
 342                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
 343                 return NULL;
 344         }
 345
 346         if(!PKCS7_type_is_signed(p7)) {
 347                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
 348                 return NULL;
 349         }
 350
 351         /* Collect all the signers together */
 352
 353         sinfos = PKCS7_get_signer_info(p7);
 354
 355         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
 356                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
 357                 return NULL;
 358         }
 359
 360         if(!(signers = sk_X509_new_null())) {
 361                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
 362                 return NULL;
 363         }
 364
 365         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 366         {
 367             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 368             ias = si->issuer_and_serial;
 369             signer = NULL;
 370                 /* If any certificates passed they take priority */
 371             if (certs) signer = X509_find_by_issuer_and_serial (certs,
 372                                                 ias->issuer, ias->serial);
 373             if (!signer && !(flags & PKCS7_NOINTERN)
 374                         && p7->d.sign->cert) signer =
 375                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
 376                                                 ias->issuer, ias->serial);
 377             if (!signer) {
 378                         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
 379                         sk_X509_free(signers);
 380                         return NULL;
 381             }
 382
 383             if (!sk_X509_push(signers, signer)) {
 384                         sk_X509_free(signers);
 385                         return NULL;
 386             }
 387         }
 388         return signers;
 389 }
 390
 391
 392 /* Build a complete PKCS#7 enveloped data */
 393
 394 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
 395                                                                 int flags)
 396 {
 397         PKCS7 *p7;
 398         BIO *p7bio = NULL;
 399         int i;
 400         X509 *x509;
 401         if(!(p7 = PKCS7_new())) {
 402                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 403                 return NULL;
 404         }
 405
 406         if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
 407                 goto err;
 408         if(!PKCS7_set_cipher(p7, cipher)) {
 409                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
 410                 goto err;
 411         }
 412
 413         for(i = 0; i < sk_X509_num(certs); i++) {
 414                 x509 = sk_X509_value(certs, i);
 415                 if(!PKCS7_add_recipient(p7, x509)) {
 416                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
 417                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
 418                         goto err;
 419                 }
 420         }
 421
 422         if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
 423                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 424                 goto err;
 425         }
 426
 427         SMIME_crlf_copy(in, p7bio, flags);
 428
 429         (void)BIO_flush(p7bio);
 430
 431         if (!PKCS7_dataFinal(p7,p7bio)) {
 432                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
 433                 goto err;
 434         }
 435         BIO_free_all(p7bio);
 436
 437         return p7;
 438
 439         err:
 440
 441         BIO_free_all(p7bio);
 442         PKCS7_free(p7);
 443         return NULL;
 444
 445 }
 446
 447 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
 448 {
 449         BIO *tmpmem;
 450         int ret, i;
 451         char buf[4096];
 452
 453         if(!p7) {
 454                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
 455                 return 0;
 456         }
 457
 458         if(!PKCS7_type_is_enveloped(p7)) {
 459                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
 460                 return 0;
 461         }
 462
 463         if(cert && !X509_check_private_key(cert, pkey)) {
 464                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
 465                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 466                 return 0;
 467         }
 468
 469         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
 470                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
 471                 return 0;
 472         }
 473
 474         if (flags & PKCS7_TEXT) {
 475                 BIO *tmpbuf, *bread;
 476                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
 477                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
 478                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 479                         BIO_free_all(tmpmem);
 480                         return 0;
 481                 }
 482                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
 483                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 484                         BIO_free_all(tmpbuf);
 485                         BIO_free_all(tmpmem);
 486                         return 0;
 487                 }
 488                 ret = SMIME_text(bread, data);
 489                 BIO_free_all(bread);
 490                 return ret;
 491         } else {
 492                 for(;;) {
 493                         i = BIO_read(tmpmem, buf, sizeof(buf));
 494                         if(i <= 0) break;
 495                         BIO_write(data, buf, i);
 496                 }
 497                 BIO_free_all(tmpmem);
 498                 return 1;
 499         }
 500 }