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(flags & PKCS7_DETACHED)PKCS7_set_detached(p7, 1);
 134
 135         if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
 136                 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
 137                 PKCS7_free(p7);
 138                 return NULL;
 139         }
 140
 141         SMIME_crlf_copy(data, p7bio, flags);
 142
 143
 144         if (!PKCS7_dataFinal(p7,p7bio)) {
 145                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_DATASIGN);
 146                 PKCS7_free(p7);
 147                 BIO_free_all(p7bio);
 148                 return NULL;
 149         }
 150
 151         BIO_free_all(p7bio);
 152         return p7;
 153 }
 154
 155 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
 156                                         BIO *indata, BIO *out, int flags)
 157 {
 158         STACK_OF(X509) *signers;
 159         X509 *signer;
 160         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 161         PKCS7_SIGNER_INFO *si;
 162         X509_STORE_CTX cert_ctx;
 163         char buf[4096];
 164         int i, j=0, k, ret = 0;
 165         BIO *p7bio;
 166         BIO *tmpin, *tmpout;
 167
 168         if(!p7) {
 169                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
 170                 return 0;
 171         }
 172
 173         if(!PKCS7_type_is_signed(p7)) {
 174                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
 175                 return 0;
 176         }
 177
 178         /* Check for no data and no content: no data to verify signature */
 179         if(PKCS7_get_detached(p7) && !indata) {
 180                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
 181                 return 0;
 182         }
 183 #if 0
 184         /* NB: this test commented out because some versions of Netscape
 185          * illegally include zero length content when signing data.
 186          */
 187
 188         /* Check for data and content: two sets of data */
 189         if(!PKCS7_get_detached(p7) && indata) {
 190                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
 191                 return 0;
 192         }
 193 #endif
 194
 195         sinfos = PKCS7_get_signer_info(p7);
 196
 197         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
 198                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
 199                 return 0;
 200         }
 201
 202
 203         signers = PKCS7_get0_signers(p7, certs, flags);
 204
 205         if(!signers) return 0;
 206
 207         /* Now verify the certificates */
 208
 209         if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) {
 210                 signer = sk_X509_value (signers, k);
 211                 if (!(flags & PKCS7_NOCHAIN)) {
 212                         if(!X509_STORE_CTX_init(&cert_ctx, store, signer,
 213                                                         p7->d.sign->cert))
 214                                 {
 215                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 216                                 sk_X509_free(signers);
 217                                 return 0;
 218                                 }
 219                         X509_STORE_CTX_set_purpose(&cert_ctx,
 220                                                 X509_PURPOSE_SMIME_SIGN);
 221                 } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) {
 222                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 223                         sk_X509_free(signers);
 224                         return 0;
 225                 }
 226                 if (!(flags & PKCS7_NOCRL))
 227                         X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
 228                 i = X509_verify_cert(&cert_ctx);
 229                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
 230                 X509_STORE_CTX_cleanup(&cert_ctx);
 231                 if (i <= 0) {
 232                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
 233                         ERR_add_error_data(2, "Verify error:",
 234                                          X509_verify_cert_error_string(j));
 235                         sk_X509_free(signers);
 236                         return 0;
 237                 }
 238                 /* Check for revocation status here */
 239         }
 240
 241         /* Performance optimization: if the content is a memory BIO then
 242          * store its contents in a temporary read only memory BIO. This
 243          * avoids potentially large numbers of slow copies of data which will
 244          * occur when reading from a read write memory BIO when signatures
 245          * are calculated.
 246          */
 247
 248         if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))
 249                 {
 250                 char *ptr;
 251                 long len;
 252                 len = BIO_get_mem_data(indata, &ptr);
 253                 tmpin = BIO_new_mem_buf(ptr, len);
 254                 if (tmpin == NULL)
 255                         {
 256                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 257                         return 0;
 258                         }
 259                 }
 260         else
 261                 tmpin = indata;
 262
 263
 264         p7bio=PKCS7_dataInit(p7,tmpin);
 265
 266         if(flags & PKCS7_TEXT) {
 267                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
 268                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 269                         goto err;
 270                 }
 271         } else tmpout = out;
 272
 273         /* We now have to 'read' from p7bio to calculate digests etc. */
 274         for (;;)
 275         {
 276                 i=BIO_read(p7bio,buf,sizeof(buf));
 277                 if (i <= 0) break;
 278                 if (tmpout) BIO_write(tmpout, buf, i);
 279         }
 280
 281         if(flags & PKCS7_TEXT) {
 282                 if(!SMIME_text(tmpout, out)) {
 283                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
 284                         BIO_free(tmpout);
 285                         goto err;
 286                 }
 287                 BIO_free(tmpout);
 288         }
 289
 290         /* Now Verify All Signatures */
 291         if (!(flags & PKCS7_NOSIGS))
 292             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 293                 {
 294                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
 295                 signer = sk_X509_value (signers, i);
 296                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
 297                 if (j <= 0) {
 298                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
 299                         goto err;
 300                 }
 301         }
 302
 303         ret = 1;
 304
 305         err:
 306
 307         if (tmpin == indata)
 308                 {
 309                 if (indata) BIO_pop(p7bio);
 310                 }
 311         BIO_free_all(p7bio);
 312
 313         sk_X509_free(signers);
 314
 315         return ret;
 316 }
 317
 318 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
 319 {
 320         STACK_OF(X509) *signers;
 321         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 322         PKCS7_SIGNER_INFO *si;
 323         PKCS7_ISSUER_AND_SERIAL *ias;
 324         X509 *signer;
 325         int i;
 326
 327         if(!p7) {
 328                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
 329                 return NULL;
 330         }
 331
 332         if(!PKCS7_type_is_signed(p7)) {
 333                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
 334                 return NULL;
 335         }
 336
 337         /* Collect all the signers together */
 338
 339         sinfos = PKCS7_get_signer_info(p7);
 340
 341         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
 342                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
 343                 return 0;
 344         }
 345
 346         if(!(signers = sk_X509_new_null())) {
 347                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
 348                 return NULL;
 349         }
 350
 351         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 352         {
 353             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 354             ias = si->issuer_and_serial;
 355             signer = NULL;
 356                 /* If any certificates passed they take priority */
 357             if (certs) signer = X509_find_by_issuer_and_serial (certs,
 358                                                 ias->issuer, ias->serial);
 359             if (!signer && !(flags & PKCS7_NOINTERN)
 360                         && p7->d.sign->cert) signer =
 361                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
 362                                                 ias->issuer, ias->serial);
 363             if (!signer) {
 364                         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
 365                         sk_X509_free(signers);
 366                         return 0;
 367             }
 368
 369             sk_X509_push(signers, signer);
 370         }
 371         return signers;
 372 }
 373
 374
 375 /* Build a complete PKCS#7 enveloped data */
 376
 377 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
 378                                                                 int flags)
 379 {
 380         PKCS7 *p7;
 381         BIO *p7bio = NULL;
 382         int i;
 383         X509 *x509;
 384         if(!(p7 = PKCS7_new())) {
 385                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 386                 return NULL;
 387         }
 388
 389         PKCS7_set_type(p7, NID_pkcs7_enveloped);
 390         if(!PKCS7_set_cipher(p7, cipher)) {
 391                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
 392                 goto err;
 393         }
 394
 395         for(i = 0; i < sk_X509_num(certs); i++) {
 396                 x509 = sk_X509_value(certs, i);
 397                 if(!PKCS7_add_recipient(p7, x509)) {
 398                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
 399                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
 400                         goto err;
 401                 }
 402         }
 403
 404         if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
 405                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 406                 goto err;
 407         }
 408
 409         SMIME_crlf_copy(in, p7bio, flags);
 410
 411         BIO_flush(p7bio);
 412
 413         if (!PKCS7_dataFinal(p7,p7bio)) {
 414                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
 415                 goto err;
 416         }
 417         BIO_free_all(p7bio);
 418
 419         return p7;
 420
 421         err:
 422
 423         BIO_free(p7bio);
 424         PKCS7_free(p7);
 425         return NULL;
 426
 427 }
 428
 429 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
 430 {
 431         BIO *tmpmem;
 432         int ret, i;
 433         char buf[4096];
 434
 435         if(!p7) {
 436                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
 437                 return 0;
 438         }
 439
 440         if(!PKCS7_type_is_enveloped(p7)) {
 441                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
 442                 return 0;
 443         }
 444
 445         if(cert && !X509_check_private_key(cert, pkey)) {
 446                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
 447                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 448                 return 0;
 449         }
 450
 451         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
 452                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
 453                 return 0;
 454         }
 455
 456         if (flags & PKCS7_TEXT) {
 457                 BIO *tmpbuf, *bread;
 458                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
 459                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
 460                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 461                         return 0;
 462                 }
 463                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
 464                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 465                         return 0;
 466                 }
 467                 ret = SMIME_text(bread, data);
 468                 BIO_free_all(bread);
 469                 return ret;
 470         } else {
 471                 for(;;) {
 472                         i = BIO_read(tmpmem, buf, sizeof(buf));
 473                         if(i <= 0) break;
 474                         BIO_write(data, buf, i);
 475                 }
 476                 BIO_free_all(tmpmem);
 477                 return 1;
 478         }
 479 }