apps/smime.c

   1 /* 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 /* S/MIME utility function */
  60
  61 #include <stdio.h>
  62 #include <string.h>
  63 #include "apps.h"
  64 #include <openssl/crypto.h>
  65 #include <openssl/pem.h>
  66 #include <openssl/err.h>
  67
  68 #undef PROG
  69 #define PROG smime_main
  70 static X509_STORE *setup_verify(char *CAfile, char *CApath);
  71 static int save_certs(char *signerfile, STACK_OF(X509) *signers);
  72
  73 #define SMIME_OP        0x10
  74 #define SMIME_ENCRYPT   (1 | SMIME_OP)
  75 #define SMIME_DECRYPT   2
  76 #define SMIME_SIGN      (3 | SMIME_OP)
  77 #define SMIME_VERIFY    4
  78 #define SMIME_PK7OUT    5
  79
  80 int MAIN(int, char **);
  81
  82 int MAIN(int argc, char **argv)
  83 {
  84         int operation = 0;
  85         int ret = 0;
  86         char **args;
  87         char *inmode = "r", *outmode = "w";
  88         char *infile = NULL, *outfile = NULL;
  89         char *signerfile = NULL, *recipfile = NULL;
  90         char *certfile = NULL, *keyfile = NULL;
  91         EVP_CIPHER *cipher = NULL;
  92         PKCS7 *p7 = NULL;
  93         X509_STORE *store = NULL;
  94         X509 *cert = NULL, *recip = NULL, *signer = NULL;
  95         EVP_PKEY *key = NULL;
  96         STACK_OF(X509) *encerts = NULL, *other = NULL;
  97         BIO *in = NULL, *out = NULL, *indata = NULL;
  98         int badarg = 0;
  99         int flags = PKCS7_DETACHED;
 100         char *to = NULL, *from = NULL, *subject = NULL;
 101         char *CAfile = NULL, *CApath = NULL;
 102         char *passargin = NULL, *passin = NULL;
 103         char *inrand = NULL;
 104         int need_rand = 0;
 105         args = argv + 1;
 106
 107         ret = 1;
 108
 109         while (!badarg && *args && *args[0] == '-') {
 110                 if (!strcmp (*args, "-encrypt")) operation = SMIME_ENCRYPT;
 111                 else if (!strcmp (*args, "-decrypt")) operation = SMIME_DECRYPT;
 112                 else if (!strcmp (*args, "-sign")) operation = SMIME_SIGN;
 113                 else if (!strcmp (*args, "-verify")) operation = SMIME_VERIFY;
 114                 else if (!strcmp (*args, "-pk7out")) operation = SMIME_PK7OUT;
 115 #ifndef NO_DES
 116                 else if (!strcmp (*args, "-des3"))
 117                                 cipher = EVP_des_ede3_cbc();
 118                 else if (!strcmp (*args, "-des"))
 119                                 cipher = EVP_des_cbc();
 120 #endif
 121 #ifndef NO_RC2
 122                 else if (!strcmp (*args, "-rc2-40"))
 123                                 cipher = EVP_rc2_40_cbc();
 124                 else if (!strcmp (*args, "-rc2-128"))
 125                                 cipher = EVP_rc2_cbc();
 126                 else if (!strcmp (*args, "-rc2-64"))
 127                                 cipher = EVP_rc2_64_cbc();
 128 #endif
 129                 else if (!strcmp (*args, "-text"))
 130                                 flags |= PKCS7_TEXT;
 131                 else if (!strcmp (*args, "-nointern"))
 132                                 flags |= PKCS7_NOINTERN;
 133                 else if (!strcmp (*args, "-noverify"))
 134                                 flags |= PKCS7_NOVERIFY;
 135                 else if (!strcmp (*args, "-nochain"))
 136                                 flags |= PKCS7_NOCHAIN;
 137                 else if (!strcmp (*args, "-nocerts"))
 138                                 flags |= PKCS7_NOCERTS;
 139                 else if (!strcmp (*args, "-noattr"))
 140                                 flags |= PKCS7_NOATTR;
 141                 else if (!strcmp (*args, "-nodetach"))
 142                                 flags &= ~PKCS7_DETACHED;
 143                 else if (!strcmp (*args, "-binary"))
 144                                 flags |= PKCS7_BINARY;
 145                 else if (!strcmp (*args, "-nosigs"))
 146                                 flags |= PKCS7_NOSIGS;
 147                 else if (!strcmp(*args,"-rand")) {
 148                         if (args[1]) {
 149                                 args++;
 150                                 inrand = *args;
 151                         } else badarg = 1;
 152                         need_rand = 1;
 153                 } else if (!strcmp(*args,"-passin")) {
 154                         if (args[1]) {
 155                                 args++;
 156                                 passargin = *args;
 157                         } else badarg = 1;
 158                 } else if (!strcmp (*args, "-to")) {
 159                         if (args[1]) {
 160                                 args++;
 161                                 to = *args;
 162                         } else badarg = 1;
 163                 } else if (!strcmp (*args, "-from")) {
 164                         if (args[1]) {
 165                                 args++;
 166                                 from = *args;
 167                         } else badarg = 1;
 168                 } else if (!strcmp (*args, "-subject")) {
 169                         if (args[1]) {
 170                                 args++;
 171                                 subject = *args;
 172                         } else badarg = 1;
 173                 } else if (!strcmp (*args, "-signer")) {
 174                         if (args[1]) {
 175                                 args++;
 176                                 signerfile = *args;
 177                         } else badarg = 1;
 178                 } else if (!strcmp (*args, "-recip")) {
 179                         if (args[1]) {
 180                                 args++;
 181                                 recipfile = *args;
 182                         } else badarg = 1;
 183                 } else if (!strcmp (*args, "-inkey")) {
 184                         if (args[1]) {
 185                                 args++;
 186                                 keyfile = *args;
 187                         } else badarg = 1;
 188                 } else if (!strcmp (*args, "-certfile")) {
 189                         if (args[1]) {
 190                                 args++;
 191                                 certfile = *args;
 192                         } else badarg = 1;
 193                 } else if (!strcmp (*args, "-CAfile")) {
 194                         if (args[1]) {
 195                                 args++;
 196                                 CAfile = *args;
 197                         } else badarg = 1;
 198                 } else if (!strcmp (*args, "-CApath")) {
 199                         if (args[1]) {
 200                                 args++;
 201                                 CApath = *args;
 202                         } else badarg = 1;
 203                 } else if (!strcmp (*args, "-in")) {
 204                         if (args[1]) {
 205                                 args++;
 206                                 infile = *args;
 207                         } else badarg = 1;
 208                 } else if (!strcmp (*args, "-out")) {
 209                         if (args[1]) {
 210                                 args++;
 211                                 outfile = *args;
 212                         } else badarg = 1;
 213                 } else badarg = 1;
 214                 args++;
 215         }
 216
 217         if(operation == SMIME_SIGN) {
 218                 if(!signerfile) {
 219                         BIO_printf(bio_err, "No signer certificate specified\n");
 220                         badarg = 1;
 221                 }
 222                 need_rand = 1;
 223         } else if(operation == SMIME_DECRYPT) {
 224                 if(!recipfile) {
 225                         BIO_printf(bio_err, "No recipient certificate and key specified\n");
 226                         badarg = 1;
 227                 }
 228         } else if(operation == SMIME_ENCRYPT) {
 229                 if(!*args) {
 230                         BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
 231                         badarg = 1;
 232                 }
 233                 need_rand = 1;
 234         } else if(!operation) badarg = 1;
 235
 236         if (badarg) {
 237                 BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n");
 238                 BIO_printf (bio_err, "where options are\n");
 239                 BIO_printf (bio_err, "-encrypt       encrypt message\n");
 240                 BIO_printf (bio_err, "-decrypt       decrypt encrypted message\n");
 241                 BIO_printf (bio_err, "-sign          sign message\n");
 242                 BIO_printf (bio_err, "-verify        verify signed message\n");
 243                 BIO_printf (bio_err, "-pk7out        output PKCS#7 structure\n");
 244 #ifndef NO_DES
 245                 BIO_printf (bio_err, "-des3          encrypt with triple DES\n");
 246                 BIO_printf (bio_err, "-des           encrypt with DES\n");
 247 #endif
 248 #ifndef NO_RC2
 249                 BIO_printf (bio_err, "-rc2-40        encrypt with RC2-40 (default)\n");
 250                 BIO_printf (bio_err, "-rc2-64        encrypt with RC2-64\n");
 251                 BIO_printf (bio_err, "-rc2-128       encrypt with RC2-128\n");
 252 #endif
 253                 BIO_printf (bio_err, "-nointern      don't search certificates in message for signer\n");
 254                 BIO_printf (bio_err, "-nosigs        don't verify message signature\n");
 255                 BIO_printf (bio_err, "-noverify      don't verify signers certificate\n");
 256                 BIO_printf (bio_err, "-nocerts       don't include signers certificate when signing\n");
 257                 BIO_printf (bio_err, "-nodetach      use opaque signing\n");
 258                 BIO_printf (bio_err, "-noattr        don't include any signed attributes\n");
 259                 BIO_printf (bio_err, "-binary        don't translate message to text\n");
 260                 BIO_printf (bio_err, "-certfile file other certificates file\n");
 261                 BIO_printf (bio_err, "-signer file   signer certificate file\n");
 262                 BIO_printf (bio_err, "-recip  file   recipient certificate file for decryption\n");
 263                 BIO_printf (bio_err, "-in file       input file\n");
 264                 BIO_printf (bio_err, "-inkey file    input private key (if not signer or recipient)\n");
 265                 BIO_printf (bio_err, "-out file      output file\n");
 266                 BIO_printf (bio_err, "-to addr       to address\n");
 267                 BIO_printf (bio_err, "-from ad       from address\n");
 268                 BIO_printf (bio_err, "-subject s     subject\n");
 269                 BIO_printf (bio_err, "-text          include or delete text MIME headers\n");
 270                 BIO_printf (bio_err, "-CApath dir    trusted certificates directory\n");
 271                 BIO_printf (bio_err, "-CAfile file   trusted certificates file\n");
 272                 BIO_printf(bio_err,  "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
 273                 BIO_printf(bio_err,  "               load the file (or the files in the directory) into\n");
 274                 BIO_printf(bio_err,  "               the random number generator\n");
 275                 BIO_printf (bio_err, "cert.pem       recipient certificate(s) for encryption\n");
 276                 goto end;
 277         }
 278
 279         if(!app_passwd(bio_err, passargin, NULL, &passin, NULL)) {
 280                 BIO_printf(bio_err, "Error getting password\n");
 281                 goto end;
 282         }
 283
 284         if (need_rand) {
 285                 app_RAND_load_file(NULL, bio_err, (inrand != NULL));
 286                 if (inrand != NULL)
 287                         BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
 288                                 app_RAND_load_files(inrand));
 289         }
 290
 291         ret = 2;
 292
 293         if(operation != SMIME_SIGN) flags &= ~PKCS7_DETACHED;
 294
 295         if(flags & PKCS7_BINARY) {
 296                 if(operation & SMIME_OP) inmode = "rb";
 297                 else outmode = "rb";
 298         }
 299
 300         if(operation == SMIME_ENCRYPT) {
 301                 if (!cipher) {
 302 #ifndef NO_RC2
 303                         cipher = EVP_rc2_40_cbc();
 304 #else
 305                         BIO_printf(bio_err, "No cipher selected\n");
 306                         goto end;
 307 #endif
 308                 }
 309                 encerts = sk_X509_new_null();
 310                 while (*args) {
 311                         if(!(cert = load_cert(bio_err,*args,FORMAT_PEM))) {
 312                                 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", *args);
 313                                 goto end;
 314                         }
 315                         sk_X509_push(encerts, cert);
 316                         cert = NULL;
 317                         args++;
 318                 }
 319         }
 320
 321         if(signerfile && (operation == SMIME_SIGN)) {
 322                 if(!(signer = load_cert(bio_err,signerfile,FORMAT_PEM))) {
 323                         BIO_printf(bio_err, "Can't read signer certificate file %s\n", signerfile);
 324                         goto end;
 325                 }
 326         }
 327
 328         if(certfile) {
 329                 if(!(other = load_certs(bio_err,certfile,FORMAT_PEM))) {
 330                         BIO_printf(bio_err, "Can't read certificate file %s\n", certfile);
 331                         ERR_print_errors(bio_err);
 332                         goto end;
 333                 }
 334         }
 335
 336         if(recipfile && (operation == SMIME_DECRYPT)) {
 337                 if(!(recip = load_cert(bio_err,recipfile,FORMAT_PEM))) {
 338                         BIO_printf(bio_err, "Can't read recipient certificate file %s\n", recipfile);
 339                         ERR_print_errors(bio_err);
 340                         goto end;
 341                 }
 342         }
 343
 344         if(operation == SMIME_DECRYPT) {
 345                 if(!keyfile) keyfile = recipfile;
 346         } else if(operation == SMIME_SIGN) {
 347                 if(!keyfile) keyfile = signerfile;
 348         } else keyfile = NULL;
 349
 350         if(keyfile) {
 351                 if(!(key = load_key(bio_err,keyfile, FORMAT_PEM, passin))) {
 352                         BIO_printf(bio_err, "Can't read recipient certificate file %s\n", keyfile);
 353                         ERR_print_errors(bio_err);
 354                         goto end;
 355                 }
 356         }
 357
 358         if (infile) {
 359                 if (!(in = BIO_new_file(infile, inmode))) {
 360                         BIO_printf (bio_err,
 361                                  "Can't open input file %s\n", infile);
 362                         goto end;
 363                 }
 364         } else in = BIO_new_fp(stdin, BIO_NOCLOSE);
 365
 366         if (outfile) {
 367                 if (!(out = BIO_new_file(outfile, outmode))) {
 368                         BIO_printf (bio_err,
 369                                  "Can't open output file %s\n", outfile);
 370                         goto end;
 371                 }
 372         } else out = BIO_new_fp(stdout, BIO_NOCLOSE);
 373
 374         if(operation == SMIME_VERIFY) {
 375                 if(!(store = setup_verify(CAfile, CApath))) goto end;
 376         }
 377
 378         ret = 3;
 379
 380         if(operation == SMIME_ENCRYPT) {
 381                 p7 = PKCS7_encrypt(encerts, in, cipher, flags);
 382         } else if(operation == SMIME_SIGN) {
 383                 p7 = PKCS7_sign(signer, key, other, in, flags);
 384                 BIO_reset(in);
 385         } else {
 386                 if(!(p7 = SMIME_read_PKCS7(in, &indata))) {
 387                         BIO_printf(bio_err, "Error reading S/MIME message\n");
 388                         goto end;
 389                 }
 390         }
 391
 392         if(!p7) {
 393                 BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
 394                 goto end;
 395         }
 396
 397         ret = 4;
 398         if(operation == SMIME_DECRYPT) {
 399                 if(!PKCS7_decrypt(p7, key, recip, out, flags)) {
 400                         BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
 401                         goto end;
 402                 }
 403         } else if(operation == SMIME_VERIFY) {
 404                 STACK_OF(X509) *signers;
 405                 if(PKCS7_verify(p7, other, store, indata, out, flags)) {
 406                         BIO_printf(bio_err, "Verification Successful\n");
 407                 } else {
 408                         BIO_printf(bio_err, "Verification Failure\n");
 409                         goto end;
 410                 }
 411                 signers = PKCS7_get0_signers(p7, other, flags);
 412                 if(!save_certs(signerfile, signers)) {
 413                         BIO_printf(bio_err, "Error writing signers to %s\n",
 414                                                                 signerfile);
 415                         ret = 5;
 416                         goto end;
 417                 }
 418                 sk_X509_free(signers);
 419         } else if(operation == SMIME_PK7OUT) {
 420                 PEM_write_bio_PKCS7(out, p7);
 421         } else {
 422                 if(to) BIO_printf(out, "To: %s\n", to);
 423                 if(from) BIO_printf(out, "From: %s\n", from);
 424                 if(subject) BIO_printf(out, "Subject: %s\n", subject);
 425                 SMIME_write_PKCS7(out, p7, in, flags);
 426         }
 427         ret = 0;
 428 end:
 429         if (need_rand)
 430                 app_RAND_write_file(NULL, bio_err);
 431         if(ret) ERR_print_errors(bio_err);
 432         sk_X509_pop_free(encerts, X509_free);
 433         sk_X509_pop_free(other, X509_free);
 434         X509_STORE_free(store);
 435         X509_free(cert);
 436         X509_free(recip);
 437         X509_free(signer);
 438         EVP_PKEY_free(key);
 439         PKCS7_free(p7);
 440         BIO_free(in);
 441         BIO_free(indata);
 442         BIO_free(out);
 443         if(passin) OPENSSL_free(passin);
 444         return (ret);
 445 }
 446
 447 static X509_STORE *setup_verify(char *CAfile, char *CApath)
 448 {
 449         X509_STORE *store;
 450         X509_LOOKUP *lookup;
 451         if(!(store = X509_STORE_new())) goto end;
 452         lookup=X509_STORE_add_lookup(store,X509_LOOKUP_file());
 453         if (lookup == NULL) goto end;
 454         if (CAfile) {
 455                 if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) {
 456                         BIO_printf(bio_err, "Error loading file %s\n", CAfile);
 457                         goto end;
 458                 }
 459         } else X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT);
 460
 461         lookup=X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir());
 462         if (lookup == NULL) goto end;
 463         if (CApath) {
 464                 if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) {
 465                         BIO_printf(bio_err, "Error loading directory %s\n", CApath);
 466                         goto end;
 467                 }
 468         } else X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT);
 469
 470         ERR_clear_error();
 471         return store;
 472         end:
 473         X509_STORE_free(store);
 474         return NULL;
 475 }
 476
 477 static int save_certs(char *signerfile, STACK_OF(X509) *signers)
 478 {
 479         int i;
 480         BIO *tmp;
 481         if(!signerfile) return 1;
 482         tmp = BIO_new_file(signerfile, "w");
 483         if(!tmp) return 0;
 484         for(i = 0; i < sk_X509_num(signers); i++)
 485                 PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
 486         BIO_free(tmp);
 487         return 1;
 488 }
 489