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_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(!(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(!(flags & PKCS7_NOSMIMECAP))
 113                 {
 114                 if(!(smcap = sk_X509_ALGOR_new_null())) {
 115                         PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
 116                         return NULL;
 117                 }
 118 #ifndef NO_DES
 119                 PKCS7_simple_smimecap (smcap, NID_des_ede3_cbc, -1);
 120 #endif
 121 #ifndef NO_RC2
 122                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 128);
 123                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 64);
 124 #endif
 125 #ifndef NO_DES
 126                 PKCS7_simple_smimecap (smcap, NID_des_cbc, -1);
 127 #endif
 128 #ifndef NO_RC2
 129                 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 40);
 130 #endif
 131                 PKCS7_add_attrib_smimecap (si, smcap);
 132                 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
 133                 }
 134         }
 135
 136         if(flags & PKCS7_DETACHED)PKCS7_set_detached(p7, 1);
 137
 138         if (!PKCS7_dataFinal(p7,p7bio)) {
 139                 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_DATASIGN);
 140                 return NULL;
 141         }
 142
 143         BIO_free_all(p7bio);
 144         return p7;
 145 }
 146
 147 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
 148                                         BIO *indata, BIO *out, int flags)
 149 {
 150         STACK_OF(X509) *signers;
 151         X509 *signer;
 152         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 153         PKCS7_SIGNER_INFO *si;
 154         X509_STORE_CTX cert_ctx;
 155         char buf[4096];
 156         int i, j=0, k;
 157         BIO *p7bio;
 158         BIO *tmpout;
 159
 160         if(!p7) {
 161                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
 162                 return 0;
 163         }
 164
 165         if(!PKCS7_type_is_signed(p7)) {
 166                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
 167                 return 0;
 168         }
 169
 170         /* Check for no data and no content: no data to verify signature */
 171         if(PKCS7_get_detached(p7) && !indata) {
 172                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
 173                 return 0;
 174         }
 175 #if 0
 176         /* NB: this test commented out because some versions of Netscape
 177          * illegally include zero length content when signing data.
 178          */
 179
 180         /* Check for data and content: two sets of data */
 181         if(!PKCS7_get_detached(p7) && indata) {
 182                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
 183                 return 0;
 184         }
 185 #endif
 186
 187         sinfos = PKCS7_get_signer_info(p7);
 188
 189         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
 190                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
 191                 return 0;
 192         }
 193
 194
 195         signers = PKCS7_get0_signers(p7, certs, flags);
 196
 197         if(!signers) return 0;
 198
 199         /* Now verify the certificates */
 200
 201         if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) {
 202                 signer = sk_X509_value (signers, k);
 203                 if (!(flags & PKCS7_NOCHAIN)) {
 204                         X509_STORE_CTX_init(&cert_ctx, store, signer,
 205                                                         p7->d.sign->cert);
 206                         X509_STORE_CTX_set_purpose(&cert_ctx,
 207                                                 X509_PURPOSE_SMIME_SIGN);
 208                 } else X509_STORE_CTX_init (&cert_ctx, store, signer, NULL);
 209                 i = X509_verify_cert(&cert_ctx);
 210                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
 211                 X509_STORE_CTX_cleanup(&cert_ctx);
 212                 if (i <= 0) {
 213                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
 214                         ERR_add_error_data(2, "Verify error:",
 215                                          X509_verify_cert_error_string(j));
 216                         sk_X509_free(signers);
 217                         return 0;
 218                 }
 219                 /* Check for revocation status here */
 220         }
 221
 222         p7bio=PKCS7_dataInit(p7,indata);
 223
 224         if(flags & PKCS7_TEXT) {
 225                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
 226                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 227                         goto err;
 228                 }
 229         } else tmpout = out;
 230
 231         /* We now have to 'read' from p7bio to calculate digests etc. */
 232         for (;;)
 233         {
 234                 i=BIO_read(p7bio,buf,sizeof(buf));
 235                 if (i <= 0) break;
 236                 if (tmpout) BIO_write(tmpout, buf, i);
 237         }
 238
 239         if(flags & PKCS7_TEXT) {
 240                 if(!SMIME_text(tmpout, out)) {
 241                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
 242                         BIO_free(tmpout);
 243                         goto err;
 244                 }
 245                 BIO_free(tmpout);
 246         }
 247
 248         /* Now Verify All Signatures */
 249         if (!(flags & PKCS7_NOSIGS))
 250             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 251                 {
 252                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
 253                 signer = sk_X509_value (signers, i);
 254                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
 255                 if (j <= 0) {
 256                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
 257                         goto err;
 258                 }
 259         }
 260
 261         sk_X509_free(signers);
 262         if(indata) BIO_pop(p7bio);
 263         BIO_free_all(p7bio);
 264
 265         return 1;
 266
 267         err:
 268
 269         sk_X509_free(signers);
 270         BIO_free(p7bio);
 271
 272         return 0;
 273 }
 274
 275 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
 276 {
 277         STACK_OF(X509) *signers;
 278         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
 279         PKCS7_SIGNER_INFO *si;
 280         PKCS7_ISSUER_AND_SERIAL *ias;
 281         X509 *signer;
 282         int i;
 283
 284         if(!p7) {
 285                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
 286                 return NULL;
 287         }
 288
 289         if(!PKCS7_type_is_signed(p7)) {
 290                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
 291                 return NULL;
 292         }
 293         if(!(signers = sk_X509_new_null())) {
 294                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
 295                 return NULL;
 296         }
 297
 298         /* Collect all the signers together */
 299
 300         sinfos = PKCS7_get_signer_info(p7);
 301
 302         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
 303                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
 304                 return 0;
 305         }
 306
 307         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 308         {
 309             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 310             ias = si->issuer_and_serial;
 311             signer = NULL;
 312                 /* If any certificates passed they take priority */
 313             if (certs) signer = X509_find_by_issuer_and_serial (certs,
 314                                                 ias->issuer, ias->serial);
 315             if (!signer && !(flags & PKCS7_NOINTERN)
 316                         && p7->d.sign->cert) signer =
 317                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
 318                                                 ias->issuer, ias->serial);
 319             if (!signer) {
 320                         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
 321                         sk_X509_free(signers);
 322                         return 0;
 323             }
 324
 325             sk_X509_push(signers, signer);
 326         }
 327         return signers;
 328 }
 329
 330
 331 /* Build a complete PKCS#7 enveloped data */
 332
 333 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, EVP_CIPHER *cipher,
 334                                                                 int flags)
 335 {
 336         PKCS7 *p7;
 337         BIO *p7bio = NULL;
 338         int i;
 339         X509 *x509;
 340         if(!(p7 = PKCS7_new())) {
 341                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 342                 return NULL;
 343         }
 344
 345         PKCS7_set_type(p7, NID_pkcs7_enveloped);
 346         if(!PKCS7_set_cipher(p7, cipher)) {
 347                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
 348                 goto err;
 349         }
 350
 351         for(i = 0; i < sk_X509_num(certs); i++) {
 352                 x509 = sk_X509_value(certs, i);
 353                 if(!PKCS7_add_recipient(p7, x509)) {
 354                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
 355                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
 356                         goto err;
 357                 }
 358         }
 359
 360         if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
 361                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 362                 goto err;
 363         }
 364
 365         SMIME_crlf_copy(in, p7bio, flags);
 366
 367         BIO_flush(p7bio);
 368
 369         if (!PKCS7_dataFinal(p7,p7bio)) {
 370                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
 371                 goto err;
 372         }
 373         BIO_free_all(p7bio);
 374
 375         return p7;
 376
 377         err:
 378
 379         BIO_free(p7bio);
 380         PKCS7_free(p7);
 381         return NULL;
 382
 383 }
 384
 385 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
 386 {
 387         BIO *tmpmem;
 388         int ret, i;
 389         char buf[4096];
 390
 391         if(!p7) {
 392                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
 393                 return 0;
 394         }
 395
 396         if(!PKCS7_type_is_enveloped(p7)) {
 397                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
 398                 return 0;
 399         }
 400
 401         if(!X509_check_private_key(cert, pkey)) {
 402                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
 403                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 404                 return 0;
 405         }
 406
 407         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
 408                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
 409                 return 0;
 410         }
 411
 412         if (flags & PKCS7_TEXT) {
 413                 BIO *tmpbuf, *bread;
 414                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
 415                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
 416                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 417                         return 0;
 418                 }
 419                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
 420                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 421                         return 0;
 422                 }
 423                 ret = SMIME_text(bread, data);
 424                 BIO_free_all(bread);
 425                 return ret;
 426         } else {
 427                 for(;;) {
 428                         i = BIO_read(tmpmem, buf, sizeof(buf));
 429                         if(i <= 0) break;
 430                         BIO_write(data, buf, i);
 431                 }
 432                 BIO_free_all(tmpmem);
 433                 return 1;
 434         }
 435 }