crypto/pkcs7/pk7_smime.c

   1 /* pk7_smime.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project 1999.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1999 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 *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(!(p7bio = PKCS7_dataInit(p7, NULL))) {
 101                 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
 102                 return NULL;
 103         }
 104
 105
 106         SMIME_crlf_copy(data, p7bio, flags);
 107
 108         if(!(flags & PKCS7_NOATTR)) {
 109                 PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
 110                                 V_ASN1_OBJECT, OBJ_nid2obj(NID_pkcs7_data));
 111                 /* Add SMIMECapabilities */
 112                 if(!(smcap = sk_new(NULL))) {
 113                         PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
 114                         return NULL;
 115                 }
 116 #ifndef NO_DES
 117                 PKCS7_simple_smimecap (smcap, NID_des_ede3_cbc, -1);
 118 #endif
 119 #ifndef NO_RC2
 120                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 128);
 121                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 64);
 122 #endif
 123 #ifndef NO_DES
 124                 PKCS7_simple_smimecap (smcap, NID_des_cbc, -1);
 125 #endif
 126 #ifndef NO_RC2
 127                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 40);
 128 #endif
 129                 PKCS7_add_attrib_smimecap (si, smcap);
 130                 sk_pop_free(smcap, X509_ALGOR_free);
 131         }
 132
 133         if(flags & PKCS7_DETACHED)PKCS7_set_detached(p7, 1);
 134
 135         if (!PKCS7_dataFinal(p7,p7bio)) {
 136                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_DATASIGN);
 137                 return NULL;
 138         }
 139
 140         BIO_free_all(p7bio);
 141         return p7;
 142 }
 143
 144 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
 145                                         BIO *indata, BIO *out, int flags)
 146 {
 147         STACK_OF(X509) *signers;
 148         X509 *signer;
 149         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 150         PKCS7_SIGNER_INFO *si;
 151         X509_STORE_CTX cert_ctx;
 152         char buf[4096];
 153         int i, j=0;
 154         BIO *p7bio;
 155         BIO *tmpout;
 156
 157         if(!p7) {
 158                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
 159                 return 0;
 160         }
 161
 162         if(!PKCS7_type_is_signed(p7)) {
 163                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
 164                 return 0;
 165         }
 166
 167         /* Check for no data and no content: no data to verify signature */
 168         if(PKCS7_get_detached(p7) && !indata) {
 169                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
 170                 return 0;
 171         }
 172
 173         /* Check for data and content: two sets of data */
 174         if(!PKCS7_get_detached(p7) && indata) {
 175                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
 176                 return 0;
 177         }
 178
 179         sinfos = PKCS7_get_signer_info(p7);
 180
 181         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
 182                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
 183                 return 0;
 184         }
 185
 186
 187         signers = PKCS7_get0_signers(p7, certs, flags);
 188
 189         if(!signers) return 0;
 190
 191         /* Now verify the certificates */
 192
 193         if (!(flags & PKCS7_NOVERIFY)) for (i = 0; i < sk_X509_num(signers); i++) {
 194                 signer = sk_X509_value (signers, i);
 195                 if (!(flags & PKCS7_NOCHAIN)) {
 196                         X509_STORE_CTX_init(&cert_ctx, store, signer,
 197                                                         p7->d.sign->cert);
 198                         X509_STORE_CTX_set_purpose(&cert_ctx,
 199                                                 X509_PURPOSE_SMIME_SIGN);
 200                 } else X509_STORE_CTX_init (&cert_ctx, store, signer, NULL);
 201                 i = X509_verify_cert(&cert_ctx);
 202                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
 203                 X509_STORE_CTX_cleanup(&cert_ctx);
 204                 if (i <= 0) {
 205                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
 206                         ERR_add_error_data(2, "Verify error:",
 207                                          X509_verify_cert_error_string(j));
 208                         sk_X509_free(signers);
 209                         return 0;
 210                 }
 211                 /* Check for revocation status here */
 212         }
 213
 214         p7bio=PKCS7_dataInit(p7,indata);
 215
 216         if(flags & PKCS7_TEXT) {
 217                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
 218                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 219                         goto err;
 220                 }
 221         } else tmpout = out;
 222
 223         /* We now have to 'read' from p7bio to calculate digests etc. */
 224         for (;;)
 225         {
 226                 i=BIO_read(p7bio,buf,sizeof(buf));
 227                 if (i <= 0) break;
 228                 if (tmpout) BIO_write(tmpout, buf, i);
 229         }
 230
 231         if(flags & PKCS7_TEXT) {
 232                 if(!SMIME_text(tmpout, out)) {
 233                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
 234                         BIO_free(tmpout);
 235                         goto err;
 236                 }
 237                 BIO_free(tmpout);
 238         }
 239
 240         /* Now Verify All Signatures */
 241         if (!(flags & PKCS7_NOSIGS))
 242             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 243                 {
 244                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
 245                 signer = sk_X509_value (signers, i);
 246                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
 247                 if (j <= 0) {
 248                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
 249                         goto err;
 250                 }
 251         }
 252
 253         sk_X509_free(signers);
 254         if(indata) BIO_pop(p7bio);
 255         BIO_free_all(p7bio);
 256
 257         return 1;
 258
 259         err:
 260
 261         sk_X509_free(signers);
 262         BIO_free(p7bio);
 263
 264         return 0;
 265 }
 266
 267 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
 268 {
 269         STACK_OF(X509) *signers;
 270         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 271         PKCS7_SIGNER_INFO *si;
 272         PKCS7_ISSUER_AND_SERIAL *ias;
 273         X509 *signer;
 274         int i;
 275
 276         if(!p7) {
 277                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
 278                 return NULL;
 279         }
 280
 281         if(!PKCS7_type_is_signed(p7)) {
 282                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
 283                 return NULL;
 284         }
 285         if(!(signers = sk_X509_new(NULL))) {
 286                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
 287                 return NULL;
 288         }
 289
 290         /* Collect all the signers together */
 291
 292         sinfos = PKCS7_get_signer_info(p7);
 293
 294         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
 295                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
 296                 return 0;
 297         }
 298
 299         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 300         {
 301             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 302             ias = si->issuer_and_serial;
 303             signer = NULL;
 304                 /* If any certificates passed they take priority */
 305             if (certs) signer = X509_find_by_issuer_and_serial (certs,
 306                                                 ias->issuer, ias->serial);
 307             if (!signer && !(flags & PKCS7_NOINTERN)
 308                         && p7->d.sign->cert) signer =
 309                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
 310                                                 ias->issuer, ias->serial);
 311             if (!signer) {
 312                         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
 313                         sk_X509_free(signers);
 314                         return 0;
 315             }
 316
 317             sk_X509_push(signers, signer);
 318         }
 319         return signers;
 320 }
 321
 322
 323 /* Build a complete PKCS#7 enveloped data */
 324
 325 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, EVP_CIPHER *cipher,
 326                                                                 int flags)
 327 {
 328         PKCS7 *p7;
 329         BIO *p7bio = NULL;
 330         int i;
 331         X509 *x509;
 332         if(!(p7 = PKCS7_new())) {
 333                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 334                 return NULL;
 335         }
 336
 337         PKCS7_set_type(p7, NID_pkcs7_enveloped);
 338         if(!PKCS7_set_cipher(p7, cipher)) {
 339                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
 340                 goto err;
 341         }
 342
 343         for(i = 0; i < sk_X509_num(certs); i++) {
 344                 x509 = sk_X509_value(certs, i);
 345                 if(!PKCS7_add_recipient(p7, x509)) {
 346                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
 347                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
 348                         goto err;
 349                 }
 350         }
 351
 352         if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
 353                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 354                 goto err;
 355         }
 356
 357         SMIME_crlf_copy(in, p7bio, flags);
 358
 359         BIO_flush(p7bio);
 360
 361         if (!PKCS7_dataFinal(p7,p7bio)) {
 362                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
 363                 goto err;
 364         }
 365         BIO_free_all(p7bio);
 366
 367         return p7;
 368
 369         err:
 370
 371         BIO_free(p7bio);
 372         PKCS7_free(p7);
 373         return NULL;
 374
 375 }
 376
 377 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
 378 {
 379         BIO *tmpmem;
 380         int ret, i;
 381         char buf[4096];
 382
 383         if(!p7) {
 384                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
 385                 return 0;
 386         }
 387
 388         if(!PKCS7_type_is_enveloped(p7)) {
 389                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
 390                 return 0;
 391         }
 392
 393         if(!X509_check_private_key(cert, pkey)) {
 394                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
 395                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 396                 return 0;
 397         }
 398
 399         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
 400                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
 401                 return 0;
 402         }
 403
 404         if (flags & PKCS7_TEXT) {
 405                 BIO *tmpbuf, *bread;
 406                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
 407                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
 408                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 409                         return 0;
 410                 }
 411                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
 412                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 413                         return 0;
 414                 }
 415                 ret = SMIME_text(bread, data);
 416                 BIO_free_all(bread);
 417                 return ret;
 418         } else {
 419                 for(;;) {
 420                         i = BIO_read(tmpmem, buf, sizeof(buf));
 421                         if(i <= 0) break;
 422                         BIO_write(data, buf, i);
 423                 }
 424                 BIO_free_all(tmpmem);
 425                 return 1;
 426         }
 427 }