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         PKCS7_ISSUER_AND_SERIAL *ias;
 148         X509_STORE_CTX cert_ctx;
 149         char buf[4096];
 150         int i, j=0;
 151         BIO *p7bio;
 152         BIO *tmpout;
 153
 154         if(OBJ_obj2nid(p7->type) != NID_pkcs7_signed) {
 155                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
 156                 return 0;
 157         }
 158
 159         /* Check for no data and no content: no data to verify signature */
 160         if(PKCS7_get_detached(p7) && !indata) {
 161                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
 162                 return 0;
 163         }
 164
 165         /* Check for data and content: two sets of data */
 166         if(!PKCS7_get_detached(p7) && indata) {
 167                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
 168                 return 0;
 169         }
 170
 171         sinfos = PKCS7_get_signer_info(p7);
 172
 173         if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
 174                                 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
 175                 return 0;
 176         }
 177
 178
 179         if(!(signers = sk_X509_new(NULL))) {
 180                 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 181                 return 0;
 182         }
 183
 184         /* Collect all the signers together */
 185
 186         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 187         {
 188             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
 189             ias = si->issuer_and_serial;
 190             signer = NULL;
 191                 /* If any certificates passed they take priority */
 192             if (certs) signer = X509_find_by_issuer_and_serial (certs,
 193                                                 ias->issuer, ias->serial);
 194             if (!signer && !(flags & PKCS7_NOINTERN)
 195                         && p7->d.sign->cert) signer =
 196                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
 197                                                 ias->issuer, ias->serial);
 198             if (!signer) {
 199                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
 200                         sk_X509_free(signers);
 201                         return 0;
 202             }
 203
 204             sk_X509_push(signers, signer);
 205         }
 206
 207
 208         /* Now verify the certificates */
 209
 210         if (!(flags & PKCS7_NOVERIFY)) for (i = 0; i < sk_X509_num(signers); i++) {
 211                 signer = sk_X509_value (signers, i);
 212                 if (!(flags & PKCS7_NOCHAIN)) {
 213                         X509_STORE_CTX_init(&cert_ctx, store, signer,
 214                                                         p7->d.sign->cert);
 215                         X509_STORE_CTX_set_purpose(&cert_ctx,
 216                                                 X509_PURPOSE_SMIME_SIGN);
 217                 } else X509_STORE_CTX_init (&cert_ctx, store, signer, NULL);
 218                 i = X509_verify_cert(&cert_ctx);
 219                 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
 220                 X509_STORE_CTX_cleanup(&cert_ctx);
 221                 if (i <= 0) {
 222                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
 223                         ERR_add_error_data(2, "Verify error:",
 224                                          X509_verify_cert_error_string(j));
 225                         sk_X509_free(signers);
 226                         return 0;
 227                 }
 228                 /* Check for revocation status here */
 229         }
 230
 231         p7bio=PKCS7_dataInit(p7,indata);
 232
 233         if(flags & PKCS7_TEXT) {
 234                 if(!(tmpout = BIO_new(BIO_s_mem()))) {
 235                         PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
 236                         goto err;
 237                 }
 238         } else tmpout = out;
 239
 240         /* We now have to 'read' from p7bio to calculate digests etc. */
 241         for (;;)
 242         {
 243                 i=BIO_read(p7bio,buf,sizeof(buf));
 244                 if (i <= 0) break;
 245                 if (tmpout) BIO_write(tmpout, buf, i);
 246         }
 247
 248         if(flags & PKCS7_TEXT) {
 249                 if(!SMIME_text(tmpout, out)) {
 250                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
 251                         BIO_free(tmpout);
 252                         goto err;
 253                 }
 254                 BIO_free(tmpout);
 255         }
 256
 257         /* Now Verify All Signatures */
 258         if (!(flags & PKCS7_NOSIGS))
 259             for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
 260                 {
 261                 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
 262                 signer = sk_X509_value (signers, i);
 263                 j=PKCS7_signatureVerify(p7bio,p7,si, signer);
 264                 if (j <= 0) {
 265                         PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
 266                         goto err;
 267                 }
 268         }
 269
 270         sk_X509_free(signers);
 271         if(indata) BIO_pop(p7bio);
 272         BIO_free_all(p7bio);
 273
 274         return 1;
 275
 276         err:
 277
 278         sk_X509_free(signers);
 279         BIO_free(p7bio);
 280
 281         return 0;
 282 }
 283
 284 /* Build a complete PKCS#7 enveloped data */
 285
 286 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, EVP_CIPHER *cipher,
 287                                                                 int flags)
 288 {
 289         PKCS7 *p7;
 290         BIO *p7bio = NULL;
 291         int i;
 292         X509 *x509;
 293         char inbuf[4096];
 294         static char txthdr[] = "Content-type: text/plain\r\n\r\n";
 295         if(!(p7 = PKCS7_new())) {
 296                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 297                 return NULL;
 298         }
 299
 300         PKCS7_set_type(p7, NID_pkcs7_enveloped);
 301         if(!PKCS7_set_cipher(p7, cipher)) {
 302                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
 303                 goto err;
 304         }
 305
 306         for(i = 0; i < sk_X509_num(certs); i++) {
 307                 x509 = sk_X509_value(certs, i);
 308                 if(!PKCS7_add_recipient(p7, x509)) {
 309                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
 310                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
 311                         goto err;
 312                 }
 313         }
 314
 315         if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
 316                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
 317                 goto err;
 318         }
 319
 320         if(flags & PKCS7_TEXT) {
 321                 if(BIO_write(p7bio, txthdr, sizeof(txthdr) - 1) < 0) {
 322                         goto err;
 323                 }
 324         }
 325
 326         for (;;) {
 327                 i = BIO_read(in, inbuf, sizeof(inbuf));
 328                 if (i <= 0) break;
 329                 BIO_write(p7bio, inbuf, i);
 330         }
 331         BIO_flush(p7bio);
 332
 333         if (!PKCS7_dataFinal(p7,p7bio)) {
 334                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
 335                 goto err;
 336         }
 337         BIO_free_all(p7bio);
 338
 339         return p7;
 340
 341         err:
 342
 343         BIO_free(p7bio);
 344         PKCS7_free(p7);
 345         return NULL;
 346
 347 }
 348
 349 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
 350 {
 351         BIO *tmpmem;
 352         int ret, i;
 353         char buf[4096];
 354         if(!PKCS7_type_is_enveloped(p7)) {
 355                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
 356                 return 0;
 357         }
 358         if(!X509_check_private_key(cert, pkey)) {
 359                 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
 360                                 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 361                 return 0;
 362         }
 363
 364         if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
 365                 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
 366                 return 0;
 367         }
 368
 369         if (flags & PKCS7_TEXT) {
 370                 BIO *tmpbuf, *bread;
 371                 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
 372                 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
 373                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 374                         return 0;
 375                 }
 376                 if(!(bread = BIO_push(tmpbuf, tmpmem))) {
 377                         PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
 378                         return 0;
 379                 }
 380                 ret = SMIME_text(bread, data);
 381                 BIO_free_all(bread);
 382                 return ret;
 383         } else {
 384                 for(;;) {
 385                         i = BIO_read(tmpmem, buf, sizeof(buf));
 386                         if(i <= 0) break;
 387                         BIO_write(data, buf, i);
 388                 }
 389                 BIO_free_all(tmpmem);
 390                 return 1;
 391         }
 392 }