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, *contfile=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         int informat = FORMAT_SMIME, outformat = FORMAT_SMIME;
 106         args = argv + 1;
 107
 108         ret = 1;
 109
 110         while (!badarg && *args && *args[0] == '-') {
 111                 if (!strcmp (*args, "-encrypt")) operation = SMIME_ENCRYPT;
 112                 else if (!strcmp (*args, "-decrypt")) operation = SMIME_DECRYPT;
 113                 else if (!strcmp (*args, "-sign")) operation = SMIME_SIGN;
 114                 else if (!strcmp (*args, "-verify")) operation = SMIME_VERIFY;
 115                 else if (!strcmp (*args, "-pk7out")) operation = SMIME_PK7OUT;
 116 #ifndef NO_DES
 117                 else if (!strcmp (*args, "-des3"))
 118                                 cipher = EVP_des_ede3_cbc();
 119                 else if (!strcmp (*args, "-des"))
 120                                 cipher = EVP_des_cbc();
 121 #endif
 122 #ifndef NO_RC2
 123                 else if (!strcmp (*args, "-rc2-40"))
 124                                 cipher = EVP_rc2_40_cbc();
 125                 else if (!strcmp (*args, "-rc2-128"))
 126                                 cipher = EVP_rc2_cbc();
 127                 else if (!strcmp (*args, "-rc2-64"))
 128                                 cipher = EVP_rc2_64_cbc();
 129 #endif
 130                 else if (!strcmp (*args, "-text"))
 131                                 flags |= PKCS7_TEXT;
 132                 else if (!strcmp (*args, "-nointern"))
 133                                 flags |= PKCS7_NOINTERN;
 134                 else if (!strcmp (*args, "-noverify"))
 135                                 flags |= PKCS7_NOVERIFY;
 136                 else if (!strcmp (*args, "-nochain"))
 137                                 flags |= PKCS7_NOCHAIN;
 138                 else if (!strcmp (*args, "-nocerts"))
 139                                 flags |= PKCS7_NOCERTS;
 140                 else if (!strcmp (*args, "-noattr"))
 141                                 flags |= PKCS7_NOATTR;
 142                 else if (!strcmp (*args, "-nodetach"))
 143                                 flags &= ~PKCS7_DETACHED;
 144                 else if (!strcmp (*args, "-binary"))
 145                                 flags |= PKCS7_BINARY;
 146                 else if (!strcmp (*args, "-nosigs"))
 147                                 flags |= PKCS7_NOSIGS;
 148                 else if (!strcmp(*args,"-rand")) {
 149                         if (args[1]) {
 150                                 args++;
 151                                 inrand = *args;
 152                         } else badarg = 1;
 153                         need_rand = 1;
 154                 } else if (!strcmp(*args,"-passin")) {
 155                         if (args[1]) {
 156                                 args++;
 157                                 passargin = *args;
 158                         } else badarg = 1;
 159                 } else if (!strcmp (*args, "-to")) {
 160                         if (args[1]) {
 161                                 args++;
 162                                 to = *args;
 163                         } else badarg = 1;
 164                 } else if (!strcmp (*args, "-from")) {
 165                         if (args[1]) {
 166                                 args++;
 167                                 from = *args;
 168                         } else badarg = 1;
 169                 } else if (!strcmp (*args, "-subject")) {
 170                         if (args[1]) {
 171                                 args++;
 172                                 subject = *args;
 173                         } else badarg = 1;
 174                 } else if (!strcmp (*args, "-signer")) {
 175                         if (args[1]) {
 176                                 args++;
 177                                 signerfile = *args;
 178                         } else badarg = 1;
 179                 } else if (!strcmp (*args, "-recip")) {
 180                         if (args[1]) {
 181                                 args++;
 182                                 recipfile = *args;
 183                         } else badarg = 1;
 184                 } else if (!strcmp (*args, "-inkey")) {
 185                         if (args[1]) {
 186                                 args++;
 187                                 keyfile = *args;
 188                         } else badarg = 1;
 189                 } else if (!strcmp (*args, "-certfile")) {
 190                         if (args[1]) {
 191                                 args++;
 192                                 certfile = *args;
 193                         } else badarg = 1;
 194                 } else if (!strcmp (*args, "-CAfile")) {
 195                         if (args[1]) {
 196                                 args++;
 197                                 CAfile = *args;
 198                         } else badarg = 1;
 199                 } else if (!strcmp (*args, "-CApath")) {
 200                         if (args[1]) {
 201                                 args++;
 202                                 CApath = *args;
 203                         } else badarg = 1;
 204                 } else if (!strcmp (*args, "-in")) {
 205                         if (args[1]) {
 206                                 args++;
 207                                 infile = *args;
 208                         } else badarg = 1;
 209                 } else if (!strcmp (*args, "-inform")) {
 210                         if (args[1]) {
 211                                 args++;
 212                                 informat = str2fmt(*args);
 213                         } else badarg = 1;
 214                 } else if (!strcmp (*args, "-outform")) {
 215                         if (args[1]) {
 216                                 args++;
 217                                 outformat = str2fmt(*args);
 218                         } else badarg = 1;
 219                 } else if (!strcmp (*args, "-out")) {
 220                         if (args[1]) {
 221                                 args++;
 222                                 outfile = *args;
 223                         } else badarg = 1;
 224                 } else if (!strcmp (*args, "-content")) {
 225                         if (args[1]) {
 226                                 args++;
 227                                 contfile = *args;
 228                         } else badarg = 1;
 229                 } else badarg = 1;
 230                 args++;
 231         }
 232
 233         if(operation == SMIME_SIGN) {
 234                 if(!signerfile) {
 235                         BIO_printf(bio_err, "No signer certificate specified\n");
 236                         badarg = 1;
 237                 }
 238                 need_rand = 1;
 239         } else if(operation == SMIME_DECRYPT) {
 240                 if(!recipfile) {
 241                         BIO_printf(bio_err, "No recipient certificate and key specified\n");
 242                         badarg = 1;
 243                 }
 244         } else if(operation == SMIME_ENCRYPT) {
 245                 if(!*args) {
 246                         BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
 247                         badarg = 1;
 248                 }
 249                 need_rand = 1;
 250         } else if(!operation) badarg = 1;
 251
 252         if (badarg) {
 253                 BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n");
 254                 BIO_printf (bio_err, "where options are\n");
 255                 BIO_printf (bio_err, "-encrypt       encrypt message\n");
 256                 BIO_printf (bio_err, "-decrypt       decrypt encrypted message\n");
 257                 BIO_printf (bio_err, "-sign          sign message\n");
 258                 BIO_printf (bio_err, "-verify        verify signed message\n");
 259                 BIO_printf (bio_err, "-pk7out        output PKCS#7 structure\n");
 260 #ifndef NO_DES
 261                 BIO_printf (bio_err, "-des3          encrypt with triple DES\n");
 262                 BIO_printf (bio_err, "-des           encrypt with DES\n");
 263 #endif
 264 #ifndef NO_RC2
 265                 BIO_printf (bio_err, "-rc2-40        encrypt with RC2-40 (default)\n");
 266                 BIO_printf (bio_err, "-rc2-64        encrypt with RC2-64\n");
 267                 BIO_printf (bio_err, "-rc2-128       encrypt with RC2-128\n");
 268 #endif
 269                 BIO_printf (bio_err, "-nointern      don't search certificates in message for signer\n");
 270                 BIO_printf (bio_err, "-nosigs        don't verify message signature\n");
 271                 BIO_printf (bio_err, "-noverify      don't verify signers certificate\n");
 272                 BIO_printf (bio_err, "-nocerts       don't include signers certificate when signing\n");
 273                 BIO_printf (bio_err, "-nodetach      use opaque signing\n");
 274                 BIO_printf (bio_err, "-noattr        don't include any signed attributes\n");
 275                 BIO_printf (bio_err, "-binary        don't translate message to text\n");
 276                 BIO_printf (bio_err, "-certfile file other certificates file\n");
 277                 BIO_printf (bio_err, "-signer file   signer certificate file\n");
 278                 BIO_printf (bio_err, "-recip  file   recipient certificate file for decryption\n");
 279                 BIO_printf (bio_err, "-in file       input file\n");
 280                 BIO_printf (bio_err, "-inkey file    input private key (if not signer or recipient)\n");
 281                 BIO_printf (bio_err, "-out file      output file\n");
 282                 BIO_printf (bio_err, "-to addr       to address\n");
 283                 BIO_printf (bio_err, "-from ad       from address\n");
 284                 BIO_printf (bio_err, "-subject s     subject\n");
 285                 BIO_printf (bio_err, "-text          include or delete text MIME headers\n");
 286                 BIO_printf (bio_err, "-CApath dir    trusted certificates directory\n");
 287                 BIO_printf (bio_err, "-CAfile file   trusted certificates file\n");
 288                 BIO_printf(bio_err,  "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
 289                 BIO_printf(bio_err,  "               load the file (or the files in the directory) into\n");
 290                 BIO_printf(bio_err,  "               the random number generator\n");
 291                 BIO_printf (bio_err, "cert.pem       recipient certificate(s) for encryption\n");
 292                 goto end;
 293         }
 294
 295         if(!app_passwd(bio_err, passargin, NULL, &passin, NULL)) {
 296                 BIO_printf(bio_err, "Error getting password\n");
 297                 goto end;
 298         }
 299
 300         if (need_rand) {
 301                 app_RAND_load_file(NULL, bio_err, (inrand != NULL));
 302                 if (inrand != NULL)
 303                         BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
 304                                 app_RAND_load_files(inrand));
 305         }
 306
 307         ret = 2;
 308
 309         if(operation != SMIME_SIGN) flags &= ~PKCS7_DETACHED;
 310
 311         if(operation & SMIME_OP) {
 312                 if(flags & PKCS7_BINARY) inmode = "rb";
 313                 if(outformat == FORMAT_ASN1) outmode = "wb";
 314         } else {
 315                 if(flags & PKCS7_BINARY) outmode = "wb";
 316                 if(informat == FORMAT_ASN1) inmode = "rb";
 317         }
 318
 319         if(operation == SMIME_ENCRYPT) {
 320                 if (!cipher) {
 321 #ifndef NO_RC2
 322                         cipher = EVP_rc2_40_cbc();
 323 #else
 324                         BIO_printf(bio_err, "No cipher selected\n");
 325                         goto end;
 326 #endif
 327                 }
 328                 encerts = sk_X509_new_null();
 329                 while (*args) {
 330                         if(!(cert = load_cert(bio_err,*args,FORMAT_PEM))) {
 331                                 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", *args);
 332                                 goto end;
 333                         }
 334                         sk_X509_push(encerts, cert);
 335                         cert = NULL;
 336                         args++;
 337                 }
 338         }
 339
 340         if(signerfile && (operation == SMIME_SIGN)) {
 341                 if(!(signer = load_cert(bio_err,signerfile,FORMAT_PEM))) {
 342                         BIO_printf(bio_err, "Can't read signer certificate file %s\n", signerfile);
 343                         goto end;
 344                 }
 345         }
 346
 347         if(certfile) {
 348                 if(!(other = load_certs(bio_err,certfile,FORMAT_PEM))) {
 349                         BIO_printf(bio_err, "Can't read certificate file %s\n", certfile);
 350                         ERR_print_errors(bio_err);
 351                         goto end;
 352                 }
 353         }
 354
 355         if(recipfile && (operation == SMIME_DECRYPT)) {
 356                 if(!(recip = load_cert(bio_err,recipfile,FORMAT_PEM))) {
 357                         BIO_printf(bio_err, "Can't read recipient certificate file %s\n", recipfile);
 358                         ERR_print_errors(bio_err);
 359                         goto end;
 360                 }
 361         }
 362
 363         if(operation == SMIME_DECRYPT) {
 364                 if(!keyfile) keyfile = recipfile;
 365         } else if(operation == SMIME_SIGN) {
 366                 if(!keyfile) keyfile = signerfile;
 367         } else keyfile = NULL;
 368
 369         if(keyfile) {
 370                 if(!(key = load_key(bio_err,keyfile, FORMAT_PEM, passin))) {
 371                         BIO_printf(bio_err, "Can't read recipient certificate file %s\n", keyfile);
 372                         ERR_print_errors(bio_err);
 373                         goto end;
 374                 }
 375         }
 376
 377         if (infile) {
 378                 if (!(in = BIO_new_file(infile, inmode))) {
 379                         BIO_printf (bio_err,
 380                                  "Can't open input file %s\n", infile);
 381                         goto end;
 382                 }
 383         } else in = BIO_new_fp(stdin, BIO_NOCLOSE);
 384
 385         if (outfile) {
 386                 if (!(out = BIO_new_file(outfile, outmode))) {
 387                         BIO_printf (bio_err,
 388                                  "Can't open output file %s\n", outfile);
 389                         goto end;
 390                 }
 391         } else out = BIO_new_fp(stdout, BIO_NOCLOSE);
 392
 393         if(operation == SMIME_VERIFY) {
 394                 if(!(store = setup_verify(CAfile, CApath))) goto end;
 395         }
 396
 397         ret = 3;
 398
 399         if(operation == SMIME_ENCRYPT) {
 400                 p7 = PKCS7_encrypt(encerts, in, cipher, flags);
 401         } else if(operation == SMIME_SIGN) {
 402                 p7 = PKCS7_sign(signer, key, other, in, flags);
 403                 BIO_reset(in);
 404         } else {
 405                 if(informat == FORMAT_SMIME)
 406                         p7 = SMIME_read_PKCS7(in, &indata);
 407                 else if(informat == FORMAT_PEM)
 408                         p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
 409                 else if(informat == FORMAT_ASN1)
 410                         p7 = d2i_PKCS7_bio(in, NULL);
 411                 else {
 412                         BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
 413                         goto end;
 414                 }
 415
 416                 if(!p7) {
 417                         BIO_printf(bio_err, "Error reading S/MIME message\n");
 418                         goto end;
 419                 }
 420                 if(contfile) {
 421                         BIO_free(indata);
 422                         if(!(indata = BIO_new_file(contfile, "rb"))) {
 423                                 BIO_printf(bio_err, "Can't read content file %s\n", contfile);
 424                                 goto end;
 425                         }
 426                 }
 427         }
 428
 429         if(!p7) {
 430                 BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
 431                 goto end;
 432         }
 433
 434         ret = 4;
 435         if(operation == SMIME_DECRYPT) {
 436                 if(!PKCS7_decrypt(p7, key, recip, out, flags)) {
 437                         BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
 438                         goto end;
 439                 }
 440         } else if(operation == SMIME_VERIFY) {
 441                 STACK_OF(X509) *signers;
 442                 if(PKCS7_verify(p7, other, store, indata, out, flags)) {
 443                         BIO_printf(bio_err, "Verification Successful\n");
 444                 } else {
 445                         BIO_printf(bio_err, "Verification Failure\n");
 446                         goto end;
 447                 }
 448                 signers = PKCS7_get0_signers(p7, other, flags);
 449                 if(!save_certs(signerfile, signers)) {
 450                         BIO_printf(bio_err, "Error writing signers to %s\n",
 451                                                                 signerfile);
 452                         ret = 5;
 453                         goto end;
 454                 }
 455                 sk_X509_free(signers);
 456         } else if(operation == SMIME_PK7OUT) {
 457                 PEM_write_bio_PKCS7(out, p7);
 458         } else {
 459                 if(to) BIO_printf(out, "To: %s\n", to);
 460                 if(from) BIO_printf(out, "From: %s\n", from);
 461                 if(subject) BIO_printf(out, "Subject: %s\n", subject);
 462                 if(outformat == FORMAT_SMIME)
 463                         SMIME_write_PKCS7(out, p7, in, flags);
 464                 else if(outformat == FORMAT_PEM)
 465                         PEM_write_bio_PKCS7(out,p7);
 466                 else if(outformat == FORMAT_ASN1)
 467                         i2d_PKCS7_bio(out,p7);
 468                 else {
 469                         BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
 470                         goto end;
 471                 }
 472         }
 473         ret = 0;
 474 end:
 475         if (need_rand)
 476                 app_RAND_write_file(NULL, bio_err);
 477         if(ret) ERR_print_errors(bio_err);
 478         sk_X509_pop_free(encerts, X509_free);
 479         sk_X509_pop_free(other, X509_free);
 480         X509_STORE_free(store);
 481         X509_free(cert);
 482         X509_free(recip);
 483         X509_free(signer);
 484         EVP_PKEY_free(key);
 485         PKCS7_free(p7);
 486         BIO_free(in);
 487         BIO_free(indata);
 488         BIO_free(out);
 489         if(passin) OPENSSL_free(passin);
 490         return (ret);
 491 }
 492
 493 static X509_STORE *setup_verify(char *CAfile, char *CApath)
 494 {
 495         X509_STORE *store;
 496         X509_LOOKUP *lookup;
 497         if(!(store = X509_STORE_new())) goto end;
 498         lookup=X509_STORE_add_lookup(store,X509_LOOKUP_file());
 499         if (lookup == NULL) goto end;
 500         if (CAfile) {
 501                 if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) {
 502                         BIO_printf(bio_err, "Error loading file %s\n", CAfile);
 503                         goto end;
 504                 }
 505         } else X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT);
 506
 507         lookup=X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir());
 508         if (lookup == NULL) goto end;
 509         if (CApath) {
 510                 if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) {
 511                         BIO_printf(bio_err, "Error loading directory %s\n", CApath);
 512                         goto end;
 513                 }
 514         } else X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT);
 515
 516         ERR_clear_error();
 517         return store;
 518         end:
 519         X509_STORE_free(store);
 520         return NULL;
 521 }
 522
 523 static int save_certs(char *signerfile, STACK_OF(X509) *signers)
 524 {
 525         int i;
 526         BIO *tmp;
 527         if(!signerfile) return 1;
 528         tmp = BIO_new_file(signerfile, "w");
 529         if(!tmp) return 0;
 530         for(i = 0; i < sk_X509_num(signers); i++)
 531                 PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
 532         BIO_free(tmp);
 533         return 1;
 534 }
 535