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) 1999-2003 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                 return NULL;
  92         }
  93
  94         if(!(flags & PKCS7_NOCERTS)) {
  95                 PKCS7_add_certificate(p7, signcert);
  96                 if(certs) for(i = 0; i < sk_X509_num(certs); i++)
  97                         PKCS7_add_certificate(p7, sk_X509_value(certs, i));
  98         }
  99
 100         if(!(flags & PKCS7_NOATTR)) {
 101                 PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
 102                                 V_ASN1_OBJECT, OBJ_nid2obj(NID_pkcs7_data));
 103                 /* Add SMIMECapabilities */
 104                 if(!(flags & PKCS7_NOSMIMECAP))
 105                 {
 106                 if(!(smcap = sk_X509_ALGOR_new_null())) {
 107                         PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
 108                         return NULL;
 109                 }
 110 #ifndef OPENSSL_NO_DES
 111                 PKCS7_simple_smimecap (smcap, NID_des_ede3_cbc, -1);
 112 #endif
 113 #ifndef OPENSSL_NO_RC2
 114                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 128);
 115                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 64);
 116 #endif
 117 #ifndef OPENSSL_NO_DES
 118                 PKCS7_simple_smimecap (smcap, NID_des_cbc, -1);
 119 #endif
 120 #ifndef OPENSSL_NO_RC2
 121                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 40);
 122 #endif
 123                 PKCS7_add_attrib_smimecap (si, smcap);
 124                 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 125                 }
 126         }
 127
 128         if (flags & PKCS7_STREAM)
 129                 return p7;
 130
 131         if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
 132                 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
 133                 return NULL;
 134         }
 135
 136         SMIME_crlf_copy(data, p7bio, flags);
 137
 138         if(flags & PKCS7_DETACHED)PKCS7_set_detached(p7, 1);
 139
 140         if (!PKCS7_dataFinal(p7,p7bio)) {
 141                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_DATASIGN);
 142                 return NULL;
 143         }
 144
 145         BIO_free_all(p7bio);
 146         return p7;
 147 }
 148
 149 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
 150                                         BIO *indata, BIO *out, int flags)
 151 {
 152         STACK_OF(X509) *signers;
 153         X509 *signer;
 154         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 155         PKCS7_SIGNER_INFO *si;
 156         X509_STORE_CTX cert_ctx;
 157         char buf[4096];
 158         int i, j=0, k, ret = 0;
 159         BIO *p7bio;
 160         BIO *tmpin, *tmpout;
 161
 162         if(!p7) {
 163                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
 164                 return 0;
 165         }
 166
 167         if(!PKCS7_type_is_signed(p7)) {
 168                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
 169                 return 0;
 170         }
 171
 172         /* Check for no data and no content: no data to verify signature */
 173         if(PKCS7_get_detached(p7) && !indata) {
 174                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
 175                 return 0;
 176         }
 177 #if 0
 178         /* NB: this test commented out because some versions of Netscape
 179          * illegally include zero length content when signing data.
 180          */
 181
 182         /* Check for data and content: two sets of data */
 183         if(!PKCS7_get_detached(p7) && indata) {
 184                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
 185                 return 0;
 186         }
 187 #endif
 188
 189         sinfos = PKCS7_get_signer_info(p7);
 190
 191         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
 192                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
 193                 return 0;
 194         }
 195
 196
 197         signers = PKCS7_get0_signers(p7, certs, flags);
 198
 199         if(!signers) return 0;
 200
 201         /* Now verify the certificates */
 202
 203         if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) {
 204                 signer = sk_X509_value (signers, k);
 205                 if (!(flags & PKCS7_NOCHAIN)) {
 206                         if(!X509_STORE_CTX_init(&cert_ctx, store, signer,
 207                                                         p7->d.sign->cert))
 208                                 {
 209                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 210                                 sk_X509_free(signers);
 211                                 return 0;
 212                                 }
 213                         X509_STORE_CTX_set_purpose(&cert_ctx,
 214                                                 X509_PURPOSE_SMIME_SIGN);
 215                 } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) {
 216                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
 217                         sk_X509_free(signers);
 218                         return 0;
 219                 }
 220                 if (!(flags & PKCS7_NOCRL))
 221                         X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
 222                 i = X509_verify_cert(&cert_ctx);
 223                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
 224                 X509_STORE_CTX_cleanup(&cert_ctx);
 225                 if (i <= 0) {
 226                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
 227                         ERR_add_error_data(2, "Verify error:",
 228                                          X509_verify_cert_error_string(j));
 229                         sk_X509_free(signers);
 230                         return 0;
 231                 }
 232                 /* Check for revocation status here */
 233         }
 234
 235         /* Performance optimization: if the content is a memory BIO then
 236          * store its contents in a temporary read only memory BIO. This
 237          * avoids potentially large numbers of slow copies of data which will
 238          * occur when reading from a read write memory BIO when signatures
 239          * are calculated.
 240          */
 241
 242         if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))
 243                 {
 244                 char *ptr;
 245                 long len;
 246                 len = BIO_get_mem_data(indata, &ptr);
 247                 tmpin = BIO_new_mem_buf(ptr, len);
 248                 if (tmpin == NULL)
 249                         {
 250                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 251                         return 0;
 252                         }
 253                 }
 254         else
 255                 tmpin = indata;
 256
 257
 258         p7bio=PKCS7_dataInit(p7,tmpin);
 259
 260         if(flags & PKCS7_TEXT) {
 261                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
 262                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 263                         goto err;
 264                 }
 265         } else tmpout = out;
 266
 267         /* We now have to 'read' from p7bio to calculate digests etc. */
 268         for (;;)
 269         {
 270                 i=BIO_read(p7bio,buf,sizeof(buf));
 271                 if (i <= 0) break;
 272                 if (tmpout) BIO_write(tmpout, buf, i);
 273         }
 274
 275         if(flags & PKCS7_TEXT) {
 276                 if(!SMIME_text(tmpout, out)) {
 277                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
 278                         BIO_free(tmpout);
 279                         goto err;
 280                 }
 281                 BIO_free(tmpout);
 282         }
 283
 284         /* Now Verify All Signatures */
 285         if (!(flags & PKCS7_NOSIGS))
 286             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 287                 {
 288                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
 289                 signer = sk_X509_value (signers, i);
 290                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
 291                 if (j <= 0) {
 292                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
 293                         goto err;
 294                 }
 295         }
 296
 297         ret = 1;
 298
 299         err:
 300
 301         if (tmpin == indata)
 302                 {
 303                 if(indata) BIO_pop(p7bio);
 304                 BIO_free_all(p7bio);
 305                 }
 306         else
 307                 BIO_free_all(tmpin);
 308
 309         sk_X509_free(signers);
 310
 311         return ret;
 312 }
 313
 314 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
 315 {
 316         STACK_OF(X509) *signers;
 317         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 318         PKCS7_SIGNER_INFO *si;
 319         PKCS7_ISSUER_AND_SERIAL *ias;
 320         X509 *signer;
 321         int i;
 322
 323         if(!p7) {
 324                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
 325                 return NULL;
 326         }
 327
 328         if(!PKCS7_type_is_signed(p7)) {
 329                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
 330                 return NULL;
 331         }
 332         if(!(signers = sk_X509_new_null())) {
 333                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
 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         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 347         {
 348             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 349             ias = si->issuer_and_serial;
 350             signer = NULL;
 351                 /* If any certificates passed they take priority */
 352             if (certs) signer = X509_find_by_issuer_and_serial (certs,
 353                                                 ias->issuer, ias->serial);
 354             if (!signer && !(flags & PKCS7_NOINTERN)
 355                         && p7->d.sign->cert) signer =
 356                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
 357                                                 ias->issuer, ias->serial);
 358             if (!signer) {
 359                         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
 360                         sk_X509_free(signers);
 361                         return 0;
 362             }
 363
 364             sk_X509_push(signers, signer);
 365         }
 366         return signers;
 367 }
 368
 369
 370 /* Build a complete PKCS#7 enveloped data */
 371
 372 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
 373                                                                 int flags)
 374 {
 375         PKCS7 *p7;
 376         BIO *p7bio = NULL;
 377         int i;
 378         X509 *x509;
 379         if(!(p7 = PKCS7_new())) {
 380                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 381                 return NULL;
 382         }
 383
 384         PKCS7_set_type(p7, NID_pkcs7_enveloped);
 385         if(!PKCS7_set_cipher(p7, cipher)) {
 386                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
 387                 goto err;
 388         }
 389
 390         for(i = 0; i < sk_X509_num(certs); i++) {
 391                 x509 = sk_X509_value(certs, i);
 392                 if(!PKCS7_add_recipient(p7, x509)) {
 393                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
 394                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
 395                         goto err;
 396                 }
 397         }
 398
 399         if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
 400                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 401                 goto err;
 402         }
 403
 404         SMIME_crlf_copy(in, p7bio, flags);
 405
 406         BIO_flush(p7bio);
 407
 408         if (!PKCS7_dataFinal(p7,p7bio)) {
 409                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
 410                 goto err;
 411         }
 412         BIO_free_all(p7bio);
 413
 414         return p7;
 415
 416         err:
 417
 418         BIO_free(p7bio);
 419         PKCS7_free(p7);
 420         return NULL;
 421
 422 }
 423
 424 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
 425 {
 426         BIO *tmpmem;
 427         int ret, i;
 428         char buf[4096];
 429
 430         if(!p7) {
 431                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
 432                 return 0;
 433         }
 434
 435         if(!PKCS7_type_is_enveloped(p7)) {
 436                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
 437                 return 0;
 438         }
 439
 440         if(!X509_check_private_key(cert, pkey)) {
 441                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
 442                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 443                 return 0;
 444         }
 445
 446         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
 447                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
 448                 return 0;
 449         }
 450
 451         if (flags & PKCS7_TEXT) {
 452                 BIO *tmpbuf, *bread;
 453                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
 454                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
 455                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 456                         return 0;
 457                 }
 458                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
 459                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 460                         return 0;
 461                 }
 462                 ret = SMIME_text(bread, data);
 463                 BIO_free_all(bread);
 464                 return ret;
 465         } else {
 466                 for(;;) {
 467                         i = BIO_read(tmpmem, buf, sizeof(buf));
 468                         if(i <= 0) break;
 469                         BIO_write(data, buf, i);
 470                 }
 471                 BIO_free_all(tmpmem);
 472                 return 1;
 473         }
 474 }