crypto/openssl-0.9/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_DETACHED)PKCS7_set_detached(p7, 1);
 131
 132         if (flags & PKCS7_STREAM)
 133                 return p7;
 134
 135
 136         if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
 137                 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
 138                 PKCS7_free(p7);
 139                 return NULL;
 140         }
 141
 142         SMIME_crlf_copy(data, p7bio, flags);
 143
 144
 145         if (!PKCS7_dataFinal(p7,p7bio)) {
 146                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_DATASIGN);
 147                 PKCS7_free(p7);
 148                 BIO_free_all(p7bio);
 149                 return NULL;
 150         }
 151
 152         BIO_free_all(p7bio);
 153         return p7;
 154 }
 155
 156 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
 157                                         BIO *indata, BIO *out, int flags)
 158 {
 159         STACK_OF(X509) *signers;
 160         X509 *signer;
 161         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 162         PKCS7_SIGNER_INFO *si;
 163         X509_STORE_CTX cert_ctx;
 164         char buf[4096];
 165         int i, j=0, k, ret = 0;
 166         BIO *p7bio;
 167         BIO *tmpin, *tmpout;
 168
 169         if(!p7) {
 170                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
 171                 return 0;
 172         }
 173
 174         if(!PKCS7_type_is_signed(p7)) {
 175                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
 176                 return 0;
 177         }
 178
 179         /* Check for no data and no content: no data to verify signature */
 180         if(PKCS7_get_detached(p7) && !indata) {
 181                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
 182                 return 0;
 183         }
 184 #if 0
 185         /* NB: this test commented out because some versions of Netscape
 186          * illegally include zero length content when signing data.
 187          */
 188
 189         /* Check for data and content: two sets of data */
 190         if(!PKCS7_get_detached(p7) && indata) {
 191                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
 192                 return 0;
 193         }
 194 #endif
 195
 196         sinfos = PKCS7_get_signer_info(p7);
 197
 198         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
 199                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
 200                 return 0;
 201         }
 202
 203
 204         signers = PKCS7_get0_signers(p7, certs, flags);
 205
 206         if(!signers) return 0;
 207
 208         /* Now verify the certificates */
 209
 210         if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) {
 211                 signer = sk_X509_value (signers, k);
 212                 if (!(flags & PKCS7_NOCHAIN)) {
 213                         if(!X509_STORE_CTX_init(&cert_ctx, store, signer,
 214                                                         p7->d.sign->cert))
 215                                 {
 216                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 217                                 sk_X509_free(signers);
 218                                 return 0;
 219                                 }
 220                         X509_STORE_CTX_set_purpose(&cert_ctx,
 221                                                 X509_PURPOSE_SMIME_SIGN);
 222                 } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) {
 223                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 224                         sk_X509_free(signers);
 225                         return 0;
 226                 }
 227                 if (!(flags & PKCS7_NOCRL))
 228                         X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
 229                 i = X509_verify_cert(&cert_ctx);
 230                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
 231                 X509_STORE_CTX_cleanup(&cert_ctx);
 232                 if (i <= 0) {
 233                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
 234                         ERR_add_error_data(2, "Verify error:",
 235                                          X509_verify_cert_error_string(j));
 236                         sk_X509_free(signers);
 237                         return 0;
 238                 }
 239                 /* Check for revocation status here */
 240         }
 241
 242         /* Performance optimization: if the content is a memory BIO then
 243          * store its contents in a temporary read only memory BIO. This
 244          * avoids potentially large numbers of slow copies of data which will
 245          * occur when reading from a read write memory BIO when signatures
 246          * are calculated.
 247          */
 248
 249         if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))
 250                 {
 251                 char *ptr;
 252                 long len;
 253                 len = BIO_get_mem_data(indata, &ptr);
 254                 tmpin = BIO_new_mem_buf(ptr, len);
 255                 if (tmpin == NULL)
 256                         {
 257                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 258                         return 0;
 259                         }
 260                 }
 261         else
 262                 tmpin = indata;
 263
 264
 265         p7bio=PKCS7_dataInit(p7,tmpin);
 266
 267         if(flags & PKCS7_TEXT) {
 268                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
 269                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 270                         goto err;
 271                 }
 272         } else tmpout = out;
 273
 274         /* We now have to 'read' from p7bio to calculate digests etc. */
 275         for (;;)
 276         {
 277                 i=BIO_read(p7bio,buf,sizeof(buf));
 278                 if (i <= 0) break;
 279                 if (tmpout) BIO_write(tmpout, buf, i);
 280         }
 281
 282         if(flags & PKCS7_TEXT) {
 283                 if(!SMIME_text(tmpout, out)) {
 284                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
 285                         BIO_free(tmpout);
 286                         goto err;
 287                 }
 288                 BIO_free(tmpout);
 289         }
 290
 291         /* Now Verify All Signatures */
 292         if (!(flags & PKCS7_NOSIGS))
 293             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 294                 {
 295                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
 296                 signer = sk_X509_value (signers, i);
 297                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
 298                 if (j <= 0) {
 299                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
 300                         goto err;
 301                 }
 302         }
 303
 304         ret = 1;
 305
 306         err:
 307
 308         if (tmpin == indata)
 309                 {
 310                 if (indata) BIO_pop(p7bio);
 311                 }
 312         BIO_free_all(p7bio);
 313
 314         sk_X509_free(signers);
 315
 316         return ret;
 317 }
 318
 319 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
 320 {
 321         STACK_OF(X509) *signers;
 322         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 323         PKCS7_SIGNER_INFO *si;
 324         PKCS7_ISSUER_AND_SERIAL *ias;
 325         X509 *signer;
 326         int i;
 327
 328         if(!p7) {
 329                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
 330                 return NULL;
 331         }
 332
 333         if(!PKCS7_type_is_signed(p7)) {
 334                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
 335                 return NULL;
 336         }
 337
 338         /* Collect all the signers together */
 339
 340         sinfos = PKCS7_get_signer_info(p7);
 341
 342         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
 343                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
 344                 return 0;
 345         }
 346
 347         if(!(signers = sk_X509_new_null())) {
 348                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
 349                 return NULL;
 350         }
 351
 352         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 353         {
 354             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 355             ias = si->issuer_and_serial;
 356             signer = NULL;
 357                 /* If any certificates passed they take priority */
 358             if (certs) signer = X509_find_by_issuer_and_serial (certs,
 359                                                 ias->issuer, ias->serial);
 360             if (!signer && !(flags & PKCS7_NOINTERN)
 361                         && p7->d.sign->cert) signer =
 362                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
 363                                                 ias->issuer, ias->serial);
 364             if (!signer) {
 365                         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
 366                         sk_X509_free(signers);
 367                         return 0;
 368             }
 369
 370             sk_X509_push(signers, signer);
 371         }
 372         return signers;
 373 }
 374
 375
 376 /* Build a complete PKCS#7 enveloped data */
 377
 378 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
 379                                                                 int flags)
 380 {
 381         PKCS7 *p7;
 382         BIO *p7bio = NULL;
 383         int i;
 384         X509 *x509;
 385         if(!(p7 = PKCS7_new())) {
 386                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 387                 return NULL;
 388         }
 389
 390         PKCS7_set_type(p7, NID_pkcs7_enveloped);
 391         if(!PKCS7_set_cipher(p7, cipher)) {
 392                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
 393                 goto err;
 394         }
 395
 396         for(i = 0; i < sk_X509_num(certs); i++) {
 397                 x509 = sk_X509_value(certs, i);
 398                 if(!PKCS7_add_recipient(p7, x509)) {
 399                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
 400                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
 401                         goto err;
 402                 }
 403         }
 404
 405         if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
 406                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 407                 goto err;
 408         }
 409
 410         SMIME_crlf_copy(in, p7bio, flags);
 411
 412         BIO_flush(p7bio);
 413
 414         if (!PKCS7_dataFinal(p7,p7bio)) {
 415                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
 416                 goto err;
 417         }
 418         BIO_free_all(p7bio);
 419
 420         return p7;
 421
 422         err:
 423
 424         BIO_free(p7bio);
 425         PKCS7_free(p7);
 426         return NULL;
 427
 428 }
 429
 430 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
 431 {
 432         BIO *tmpmem;
 433         int ret, i;
 434         char buf[4096];
 435
 436         if(!p7) {
 437                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
 438                 return 0;
 439         }
 440
 441         if(!PKCS7_type_is_enveloped(p7)) {
 442                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
 443                 return 0;
 444         }
 445
 446         if(cert && !X509_check_private_key(cert, pkey)) {
 447                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
 448                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 449                 return 0;
 450         }
 451
 452         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
 453                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
 454                 return 0;
 455         }
 456
 457         if (flags & PKCS7_TEXT) {
 458                 BIO *tmpbuf, *bread;
 459                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
 460                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
 461                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 462                         return 0;
 463                 }
 464                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
 465                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 466                         return 0;
 467                 }
 468                 ret = SMIME_text(bread, data);
 469                 BIO_free_all(bread);
 470                 return ret;
 471         } else {
 472                 for(;;) {
 473                         i = BIO_read(tmpmem, buf, sizeof(buf));
 474                         if(i <= 0) break;
 475                         BIO_write(data, buf, i);
 476                 }
 477                 BIO_free_all(tmpmem);
 478                 return 1;
 479         }
 480 }