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                 PKCS7_simple_smimecap (smcap, NID_des_cbc, -1);
 119 #endif
 120 #ifndef NO_RC2
 121                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 40);
 122                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 128);
 123                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 64);
 124 #endif
 125                 PKCS7_add_attrib_smimecap (si, smcap);
 126                 sk_pop_free(smcap, X509_ALGOR_free);
 127         }
 128
 129         if(flags & PKCS7_DETACHED)PKCS7_set_detached(p7, 1);
 130
 131         if (!PKCS7_dataFinal(p7,p7bio)) {
 132                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_DATASIGN);
 133                 return NULL;
 134         }
 135
 136         BIO_free_all(p7bio);
 137         return p7;
 138 }
 139
 140 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
 141                                         BIO *indata, BIO *out, int flags)
 142 {
 143         STACK_OF(X509) *signers;
 144         X509 *signer;
 145         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 146         PKCS7_SIGNER_INFO *si;
 147         X509_STORE_CTX cert_ctx;
 148         char buf[4096];
 149         int i, j=0;
 150         BIO *p7bio;
 151         BIO *tmpout;
 152
 153         if(!PKCS7_type_is_signed(p7)) {
 154                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
 155                 return 0;
 156         }
 157
 158         /* Check for no data and no content: no data to verify signature */
 159         if(PKCS7_get_detached(p7) && !indata) {
 160                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
 161                 return 0;
 162         }
 163
 164         /* Check for data and content: two sets of data */
 165         if(!PKCS7_get_detached(p7) && indata) {
 166                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
 167                 return 0;
 168         }
 169
 170         sinfos = PKCS7_get_signer_info(p7);
 171
 172         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
 173                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
 174                 return 0;
 175         }
 176
 177
 178         signers = PKCS7_iget_signers(p7, certs, flags);
 179
 180         if(!signers) return 0;
 181
 182         /* Now verify the certificates */
 183
 184         if (!(flags & PKCS7_NOVERIFY)) for (i = 0; i < sk_X509_num(signers); i++) {
 185                 signer = sk_X509_value (signers, i);
 186                 if (!(flags & PKCS7_NOCHAIN)) {
 187                         X509_STORE_CTX_init(&cert_ctx, store, signer,
 188                                                         p7->d.sign->cert);
 189                         X509_STORE_CTX_set_purpose(&cert_ctx,
 190                                                 X509_PURPOSE_SMIME_SIGN);
 191                 } else X509_STORE_CTX_init (&cert_ctx, store, signer, NULL);
 192                 i = X509_verify_cert(&cert_ctx);
 193                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
 194                 X509_STORE_CTX_cleanup(&cert_ctx);
 195                 if (i <= 0) {
 196                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
 197                         ERR_add_error_data(2, "Verify error:",
 198                                          X509_verify_cert_error_string(j));
 199                         sk_X509_free(signers);
 200                         return 0;
 201                 }
 202                 /* Check for revocation status here */
 203         }
 204
 205         p7bio=PKCS7_dataInit(p7,indata);
 206
 207         if(flags & PKCS7_TEXT) {
 208                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
 209                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 210                         goto err;
 211                 }
 212         } else tmpout = out;
 213
 214         /* We now have to 'read' from p7bio to calculate digests etc. */
 215         for (;;)
 216         {
 217                 i=BIO_read(p7bio,buf,sizeof(buf));
 218                 if (i <= 0) break;
 219                 if (tmpout) BIO_write(tmpout, buf, i);
 220         }
 221
 222         if(flags & PKCS7_TEXT) {
 223                 if(!SMIME_text(tmpout, out)) {
 224                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
 225                         BIO_free(tmpout);
 226                         goto err;
 227                 }
 228                 BIO_free(tmpout);
 229         }
 230
 231         /* Now Verify All Signatures */
 232         if (!(flags & PKCS7_NOSIGS))
 233             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 234                 {
 235                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
 236                 signer = sk_X509_value (signers, i);
 237                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
 238                 if (j <= 0) {
 239                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
 240                         goto err;
 241                 }
 242         }
 243
 244         sk_X509_free(signers);
 245         if(indata) BIO_pop(p7bio);
 246         BIO_free_all(p7bio);
 247
 248         return 1;
 249
 250         err:
 251
 252         sk_X509_free(signers);
 253         BIO_free(p7bio);
 254
 255         return 0;
 256 }
 257
 258 STACK_OF(X509) *PKCS7_iget_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
 259 {
 260         STACK_OF(X509) *signers;
 261         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 262         PKCS7_SIGNER_INFO *si;
 263         PKCS7_ISSUER_AND_SERIAL *ias;
 264         X509 *signer;
 265         int i;
 266
 267         if(!PKCS7_type_is_signed(p7)) {
 268                 PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
 269                 return NULL;
 270         }
 271         if(!(signers = sk_X509_new(NULL))) {
 272                 PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,ERR_R_MALLOC_FAILURE);
 273                 return NULL;
 274         }
 275
 276         /* Collect all the signers together */
 277
 278         sinfos = PKCS7_get_signer_info(p7);
 279
 280         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
 281                 PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,PKCS7_R_NO_SIGNERS);
 282                 return 0;
 283         }
 284
 285         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 286         {
 287             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 288             ias = si->issuer_and_serial;
 289             signer = NULL;
 290                 /* If any certificates passed they take priority */
 291             if (certs) signer = X509_find_by_issuer_and_serial (certs,
 292                                                 ias->issuer, ias->serial);
 293             if (!signer && !(flags & PKCS7_NOINTERN)
 294                         && p7->d.sign->cert) signer =
 295                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
 296                                                 ias->issuer, ias->serial);
 297             if (!signer) {
 298                         PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
 299                         sk_X509_free(signers);
 300                         return 0;
 301             }
 302
 303             sk_X509_push(signers, signer);
 304         }
 305         return signers;
 306 }
 307
 308
 309 /* Build a complete PKCS#7 enveloped data */
 310
 311 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, EVP_CIPHER *cipher,
 312                                                                 int flags)
 313 {
 314         PKCS7 *p7;
 315         BIO *p7bio = NULL;
 316         int i;
 317         X509 *x509;
 318         char inbuf[4096];
 319         static char txthdr[] = "Content-type: text/plain\r\n\r\n";
 320         if(!(p7 = PKCS7_new())) {
 321                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 322                 return NULL;
 323         }
 324
 325         PKCS7_set_type(p7, NID_pkcs7_enveloped);
 326         if(!PKCS7_set_cipher(p7, cipher)) {
 327                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
 328                 goto err;
 329         }
 330
 331         for(i = 0; i < sk_X509_num(certs); i++) {
 332                 x509 = sk_X509_value(certs, i);
 333                 if(!PKCS7_add_recipient(p7, x509)) {
 334                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
 335                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
 336                         goto err;
 337                 }
 338         }
 339
 340         if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
 341                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 342                 goto err;
 343         }
 344
 345         if(flags & PKCS7_TEXT) {
 346                 if(BIO_write(p7bio, txthdr, sizeof(txthdr) - 1) < 0) {
 347                         goto err;
 348                 }
 349         }
 350
 351         for (;;) {
 352                 i = BIO_read(in, inbuf, sizeof(inbuf));
 353                 if (i <= 0) break;
 354                 BIO_write(p7bio, inbuf, i);
 355         }
 356         BIO_flush(p7bio);
 357
 358         if (!PKCS7_dataFinal(p7,p7bio)) {
 359                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
 360                 goto err;
 361         }
 362         BIO_free_all(p7bio);
 363
 364         return p7;
 365
 366         err:
 367
 368         BIO_free(p7bio);
 369         PKCS7_free(p7);
 370         return NULL;
 371
 372 }
 373
 374 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
 375 {
 376         BIO *tmpmem;
 377         int ret, i;
 378         char buf[4096];
 379         if(!PKCS7_type_is_enveloped(p7)) {
 380                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
 381                 return 0;
 382         }
 383         if(!X509_check_private_key(cert, pkey)) {
 384                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
 385                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 386                 return 0;
 387         }
 388
 389         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
 390                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
 391                 return 0;
 392         }
 393
 394         if (flags & PKCS7_TEXT) {
 395                 BIO *tmpbuf, *bread;
 396                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
 397                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
 398                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 399                         return 0;
 400                 }
 401                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
 402                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 403                         return 0;
 404                 }
 405                 ret = SMIME_text(bread, data);
 406                 BIO_free_all(bread);
 407                 return ret;
 408         } else {
 409                 for(;;) {
 410                         i = BIO_read(tmpmem, buf, sizeof(buf));
 411                         if(i <= 0) break;
 412                         BIO_write(data, buf, i);
 413                 }
 414                 BIO_free_all(tmpmem);
 415                 return 1;
 416         }
 417 }