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(!p7) {
 154                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
 155                 return NULL;
 156         }
 157
 158         if(!PKCS7_type_is_signed(p7)) {
 159                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
 160                 return 0;
 161         }
 162
 163         /* Check for no data and no content: no data to verify signature */
 164         if(PKCS7_get_detached(p7) && !indata) {
 165                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
 166                 return 0;
 167         }
 168
 169         /* Check for data and content: two sets of data */
 170         if(!PKCS7_get_detached(p7) && indata) {
 171                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
 172                 return 0;
 173         }
 174
 175         sinfos = PKCS7_get_signer_info(p7);
 176
 177         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
 178                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
 179                 return 0;
 180         }
 181
 182
 183         signers = PKCS7_iget_signers(p7, certs, flags);
 184
 185         if(!signers) return 0;
 186
 187         /* Now verify the certificates */
 188
 189         if (!(flags & PKCS7_NOVERIFY)) for (i = 0; i < sk_X509_num(signers); i++) {
 190                 signer = sk_X509_value (signers, i);
 191                 if (!(flags & PKCS7_NOCHAIN)) {
 192                         X509_STORE_CTX_init(&cert_ctx, store, signer,
 193                                                         p7->d.sign->cert);
 194                         X509_STORE_CTX_set_purpose(&cert_ctx,
 195                                                 X509_PURPOSE_SMIME_SIGN);
 196                 } else X509_STORE_CTX_init (&cert_ctx, store, signer, NULL);
 197                 i = X509_verify_cert(&cert_ctx);
 198                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
 199                 X509_STORE_CTX_cleanup(&cert_ctx);
 200                 if (i <= 0) {
 201                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
 202                         ERR_add_error_data(2, "Verify error:",
 203                                          X509_verify_cert_error_string(j));
 204                         sk_X509_free(signers);
 205                         return 0;
 206                 }
 207                 /* Check for revocation status here */
 208         }
 209
 210         p7bio=PKCS7_dataInit(p7,indata);
 211
 212         if(flags & PKCS7_TEXT) {
 213                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
 214                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 215                         goto err;
 216                 }
 217         } else tmpout = out;
 218
 219         /* We now have to 'read' from p7bio to calculate digests etc. */
 220         for (;;)
 221         {
 222                 i=BIO_read(p7bio,buf,sizeof(buf));
 223                 if (i <= 0) break;
 224                 if (tmpout) BIO_write(tmpout, buf, i);
 225         }
 226
 227         if(flags & PKCS7_TEXT) {
 228                 if(!SMIME_text(tmpout, out)) {
 229                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
 230                         BIO_free(tmpout);
 231                         goto err;
 232                 }
 233                 BIO_free(tmpout);
 234         }
 235
 236         /* Now Verify All Signatures */
 237         if (!(flags & PKCS7_NOSIGS))
 238             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 239                 {
 240                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
 241                 signer = sk_X509_value (signers, i);
 242                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
 243                 if (j <= 0) {
 244                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
 245                         goto err;
 246                 }
 247         }
 248
 249         sk_X509_free(signers);
 250         if(indata) BIO_pop(p7bio);
 251         BIO_free_all(p7bio);
 252
 253         return 1;
 254
 255         err:
 256
 257         sk_X509_free(signers);
 258         BIO_free(p7bio);
 259
 260         return 0;
 261 }
 262
 263 STACK_OF(X509) *PKCS7_iget_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
 264 {
 265         STACK_OF(X509) *signers;
 266         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 267         PKCS7_SIGNER_INFO *si;
 268         PKCS7_ISSUER_AND_SERIAL *ias;
 269         X509 *signer;
 270         int i;
 271
 272         if(!p7) {
 273                 PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
 274                 return NULL;
 275         }
 276
 277         if(!PKCS7_type_is_signed(p7)) {
 278                 PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
 279                 return NULL;
 280         }
 281         if(!(signers = sk_X509_new(NULL))) {
 282                 PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,ERR_R_MALLOC_FAILURE);
 283                 return NULL;
 284         }
 285
 286         /* Collect all the signers together */
 287
 288         sinfos = PKCS7_get_signer_info(p7);
 289
 290         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
 291                 PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,PKCS7_R_NO_SIGNERS);
 292                 return 0;
 293         }
 294
 295         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 296         {
 297             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 298             ias = si->issuer_and_serial;
 299             signer = NULL;
 300                 /* If any certificates passed they take priority */
 301             if (certs) signer = X509_find_by_issuer_and_serial (certs,
 302                                                 ias->issuer, ias->serial);
 303             if (!signer && !(flags & PKCS7_NOINTERN)
 304                         && p7->d.sign->cert) signer =
 305                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
 306                                                 ias->issuer, ias->serial);
 307             if (!signer) {
 308                         PKCS7err(PKCS7_F_PKCS7_IGET_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
 309                         sk_X509_free(signers);
 310                         return 0;
 311             }
 312
 313             sk_X509_push(signers, signer);
 314         }
 315         return signers;
 316 }
 317
 318
 319 /* Build a complete PKCS#7 enveloped data */
 320
 321 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, EVP_CIPHER *cipher,
 322                                                                 int flags)
 323 {
 324         PKCS7 *p7;
 325         BIO *p7bio = NULL;
 326         int i;
 327         X509 *x509;
 328         char inbuf[4096];
 329         static char txthdr[] = "Content-type: text/plain\r\n\r\n";
 330         if(!(p7 = PKCS7_new())) {
 331                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 332                 return NULL;
 333         }
 334
 335         PKCS7_set_type(p7, NID_pkcs7_enveloped);
 336         if(!PKCS7_set_cipher(p7, cipher)) {
 337                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
 338                 goto err;
 339         }
 340
 341         for(i = 0; i < sk_X509_num(certs); i++) {
 342                 x509 = sk_X509_value(certs, i);
 343                 if(!PKCS7_add_recipient(p7, x509)) {
 344                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
 345                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
 346                         goto err;
 347                 }
 348         }
 349
 350         if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
 351                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 352                 goto err;
 353         }
 354
 355         if(flags & PKCS7_TEXT) {
 356                 if(BIO_write(p7bio, txthdr, sizeof(txthdr) - 1) < 0) {
 357                         goto err;
 358                 }
 359         }
 360
 361         for (;;) {
 362                 i = BIO_read(in, inbuf, sizeof(inbuf));
 363                 if (i <= 0) break;
 364                 BIO_write(p7bio, inbuf, i);
 365         }
 366         BIO_flush(p7bio);
 367
 368         if (!PKCS7_dataFinal(p7,p7bio)) {
 369                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
 370                 goto err;
 371         }
 372         BIO_free_all(p7bio);
 373
 374         return p7;
 375
 376         err:
 377
 378         BIO_free(p7bio);
 379         PKCS7_free(p7);
 380         return NULL;
 381
 382 }
 383
 384 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
 385 {
 386         BIO *tmpmem;
 387         int ret, i;
 388         char buf[4096];
 389
 390         if(!p7) {
 391                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
 392                 return 0;
 393         }
 394
 395         if(!PKCS7_type_is_enveloped(p7)) {
 396                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
 397                 return 0;
 398         }
 399
 400         if(!X509_check_private_key(cert, pkey)) {
 401                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
 402                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 403                 return 0;
 404         }
 405
 406         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
 407                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
 408                 return 0;
 409         }
 410
 411         if (flags & PKCS7_TEXT) {
 412                 BIO *tmpbuf, *bread;
 413                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
 414                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
 415                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 416                         return 0;
 417                 }
 418                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
 419                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 420                         return 0;
 421                 }
 422                 ret = SMIME_text(bread, data);
 423                 BIO_free_all(bread);
 424                 return ret;
 425         } else {
 426                 for(;;) {
 427                         i = BIO_read(tmpmem, buf, sizeof(buf));
 428                         if(i <= 0) break;
 429                         BIO_write(data, buf, i);
 430                 }
 431                 BIO_free_all(tmpmem);
 432                 return 1;
 433         }
 434 }