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 <openssl/pem.h>
  64 #include <openssl/err.h>
  65 #include "apps.h"
  66
  67 #undef PROG
  68 #define PROG smime_main
  69 static X509 *load_cert(char *file);
  70 static EVP_PKEY *load_key(char *file);
  71 static STACK_OF(X509) *load_certs(char *file);
  72 static X509_STORE *setup_verify(char *CAfile, char *CApath);
  73 static int save_certs(char *signerfile, STACK_OF(X509) *signers);
  74
  75 #define SMIME_OP        0x10
  76 #define SMIME_ENCRYPT   (1 | SMIME_OP)
  77 #define SMIME_DECRYPT   2
  78 #define SMIME_SIGN      (3 | SMIME_OP)
  79 #define SMIME_VERIFY    4
  80 #define SMIME_PK7OUT    5
  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
 103         args = argv + 1;
 104
 105         ret = 1;
 106
 107         while (!badarg && *args && *args[0] == '-') {
 108                 if (!strcmp (*args, "-encrypt")) operation = SMIME_ENCRYPT;
 109                 else if (!strcmp (*args, "-decrypt")) operation = SMIME_DECRYPT;
 110                 else if (!strcmp (*args, "-sign")) operation = SMIME_SIGN;
 111                 else if (!strcmp (*args, "-verify")) operation = SMIME_VERIFY;
 112                 else if (!strcmp (*args, "-pk7out")) operation = SMIME_PK7OUT;
 113                 else if (!strcmp (*args, "-des3"))
 114                                 cipher = EVP_des_ede3_cbc();
 115                 else if (!strcmp (*args, "-des"))
 116                                 cipher = EVP_des_cbc();
 117                 else if (!strcmp (*args, "-rc2-40"))
 118                                 cipher = EVP_rc2_40_cbc();
 119                 else if (!strcmp (*args, "-rc2-128"))
 120                                 cipher = EVP_rc2_cbc();
 121                 else if (!strcmp (*args, "-rc2-64"))
 122                                 cipher = EVP_rc2_64_cbc();
 123                 else if (!strcmp (*args, "-text"))
 124                                 flags |= PKCS7_TEXT;
 125                 else if (!strcmp (*args, "-nointern"))
 126                                 flags |= PKCS7_NOINTERN;
 127                 else if (!strcmp (*args, "-noverify"))
 128                                 flags |= PKCS7_NOVERIFY;
 129                 else if (!strcmp (*args, "-nochain"))
 130                                 flags |= PKCS7_NOCHAIN;
 131                 else if (!strcmp (*args, "-nocerts"))
 132                                 flags |= PKCS7_NOCERTS;
 133                 else if (!strcmp (*args, "-noattr"))
 134                                 flags |= PKCS7_NOATTR;
 135                 else if (!strcmp (*args, "-nodetach"))
 136                                 flags &= ~PKCS7_DETACHED;
 137                 else if (!strcmp (*args, "-binary"))
 138                                 flags |= PKCS7_BINARY;
 139                 else if (!strcmp (*args, "-nosigs"))
 140                                 flags |= PKCS7_NOSIGS;
 141                 else if (!strcmp (*args, "-to")) {
 142                         if (args[1]) {
 143                                 args++;
 144                                 to = *args;
 145                         } else badarg = 1;
 146                 } else if (!strcmp (*args, "-from")) {
 147                         if (args[1]) {
 148                                 args++;
 149                                 from = *args;
 150                         } else badarg = 1;
 151                 } else if (!strcmp (*args, "-subject")) {
 152                         if (args[1]) {
 153                                 args++;
 154                                 subject = *args;
 155                         } else badarg = 1;
 156                 } else if (!strcmp (*args, "-signer")) {
 157                         if (args[1]) {
 158                                 args++;
 159                                 signerfile = *args;
 160                         } else badarg = 1;
 161                 } else if (!strcmp (*args, "-recip")) {
 162                         if (args[1]) {
 163                                 args++;
 164                                 recipfile = *args;
 165                         } else badarg = 1;
 166                 } else if (!strcmp (*args, "-inkey")) {
 167                         if (args[1]) {
 168                                 args++;
 169                                 keyfile = *args;
 170                         } else badarg = 1;
 171                 } else if (!strcmp (*args, "-certfile")) {
 172                         if (args[1]) {
 173                                 args++;
 174                                 certfile = *args;
 175                         } else badarg = 1;
 176                 } else if (!strcmp (*args, "-CAfile")) {
 177                         if (args[1]) {
 178                                 args++;
 179                                 CAfile = *args;
 180                         } else badarg = 1;
 181                 } else if (!strcmp (*args, "-CApath")) {
 182                         if (args[1]) {
 183                                 args++;
 184                                 CApath = *args;
 185                         } else badarg = 1;
 186                 } else if (!strcmp (*args, "-in")) {
 187                         if (args[1]) {
 188                                 args++;
 189                                 infile = *args;
 190                         } else badarg = 1;
 191                 } else if (!strcmp (*args, "-out")) {
 192                         if (args[1]) {
 193                                 args++;
 194                                 outfile = *args;
 195                         } else badarg = 1;
 196                 } else badarg = 1;
 197                 args++;
 198         }
 199
 200         if(operation == SMIME_SIGN) {
 201                 if(!signerfile) {
 202                         BIO_printf(bio_err, "No signer certificate specified\n");
 203                         badarg = 1;
 204                 }
 205         } else if(operation == SMIME_DECRYPT) {
 206                 if(!recipfile) {
 207                         BIO_printf(bio_err, "No recipient certificate and key specified\n");
 208                         badarg = 1;
 209                 }
 210         } else if(operation == SMIME_ENCRYPT) {
 211                 if(!*args) {
 212                         BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
 213                         badarg = 1;
 214                 }
 215         } else if(!operation) badarg = 1;
 216
 217         if (badarg) {
 218                 BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n");
 219                 BIO_printf (bio_err, "where options are\n");
 220                 BIO_printf (bio_err, "-encrypt       encrypt message\n");
 221                 BIO_printf (bio_err, "-decrypt       decrypt encrypted message\n");
 222                 BIO_printf (bio_err, "-sign          sign message\n");
 223                 BIO_printf (bio_err, "-verify        verify signed message\n");
 224                 BIO_printf (bio_err, "-pk7out        output PKCS#7 structure\n");
 225                 BIO_printf (bio_err, "-des3          encrypt with triple DES\n");
 226                 BIO_printf (bio_err, "-rc2-40        encrypt with RC2-40\n");
 227                 BIO_printf (bio_err, "-rc2-64        encrypt with RC2-64\n");
 228                 BIO_printf (bio_err, "-rc2-128       encrypt with RC2-128\n");
 229                 BIO_printf (bio_err, "-nointern      don't search certificates in message for signer\n");
 230                 BIO_printf (bio_err, "-nosigs        don't verify message signature\n");
 231                 BIO_printf (bio_err, "-noverify      don't verify signers certificate\n");
 232                 BIO_printf (bio_err, "-nocerts       don't include signers certificate when signing\n");
 233                 BIO_printf (bio_err, "-nodetach      use opaque signing\n");
 234                 BIO_printf (bio_err, "-noattr        don't include any signed attributes\n");
 235                 BIO_printf (bio_err, "-binary        don't translate message to text\n");
 236                 BIO_printf (bio_err, "-in file       input file\n");
 237                 BIO_printf (bio_err, "-certfile file other certificates file\n");
 238                 BIO_printf (bio_err, "-signer file   signer certificate file\n");
 239                 BIO_printf (bio_err, "-recip  file   recipient certificate file\n");
 240                 BIO_printf (bio_err, "-in file       input file\n");
 241                 BIO_printf (bio_err, "-inkey file    input private key (if not signer or recipient)\n");
 242                 BIO_printf (bio_err, "-out file      output file\n");
 243                 BIO_printf (bio_err, "-to addr       to address\n");
 244                 BIO_printf (bio_err, "-from ad       from address\n");
 245                 BIO_printf (bio_err, "-subject s     subject\n");
 246                 BIO_printf (bio_err, "-text          include or delete text MIME headers\n");
 247                 BIO_printf (bio_err, "-CApath dir    trusted certificates directory\n");
 248                 BIO_printf (bio_err, "-CAfile file   trusted certificates file\n");
 249                 BIO_printf (bio_err, "cert.pem       recipient certificate(s)\n");
 250                 goto end;
 251         }
 252
 253         ret = 2;
 254
 255         if(operation != SMIME_SIGN) flags &= ~PKCS7_DETACHED;
 256
 257         if(flags & PKCS7_BINARY) {
 258                 if(operation & SMIME_OP) inmode = "rb";
 259                 else outmode = "rb";
 260         }
 261
 262         if(operation == SMIME_ENCRYPT) {
 263                 if (!cipher) cipher = EVP_rc2_40_cbc();
 264                 encerts = sk_X509_new_null();
 265                 while (*args) {
 266                         if(!(cert = load_cert(*args))) {
 267                                 BIO_printf(bio_err, "Can't read recipent certificate file %s\n", *args);
 268                                 goto end;
 269                         }
 270                         sk_X509_push(encerts, cert);
 271                         cert = NULL;
 272                         args++;
 273                 }
 274         }
 275
 276         if(signerfile && (operation == SMIME_SIGN)) {
 277                 if(!(signer = load_cert(signerfile))) {
 278                         BIO_printf(bio_err, "Can't read signer certificate file %s\n", signerfile);
 279                         goto end;
 280                 }
 281         }
 282
 283         if(certfile) {
 284                 if(!(other = load_certs(certfile))) {
 285                         BIO_printf(bio_err, "Can't read certificate file %s\n", certfile);
 286                         ERR_print_errors(bio_err);
 287                         goto end;
 288                 }
 289         }
 290
 291         if(recipfile && (operation == SMIME_DECRYPT)) {
 292                 if(!(recip = load_cert(recipfile))) {
 293                         BIO_printf(bio_err, "Can't read recipient certificate file %s\n", recipfile);
 294                         ERR_print_errors(bio_err);
 295                         goto end;
 296                 }
 297         }
 298
 299         if(operation == SMIME_DECRYPT) {
 300                 if(!keyfile) keyfile = recipfile;
 301         } else if(operation == SMIME_SIGN) {
 302                 if(!keyfile) keyfile = signerfile;
 303         } else keyfile = NULL;
 304
 305         if(keyfile) {
 306                 if(!(key = load_key(keyfile))) {
 307                         BIO_printf(bio_err, "Can't read recipient certificate file %s\n", keyfile);
 308                         ERR_print_errors(bio_err);
 309                         goto end;
 310                 }
 311         }
 312
 313         if (infile) {
 314                 if (!(in = BIO_new_file(infile, inmode))) {
 315                         BIO_printf (bio_err,
 316                                  "Can't open input file %s\n", infile);
 317                         goto end;
 318                 }
 319         } else in = BIO_new_fp(stdin, BIO_NOCLOSE);
 320
 321         if (outfile) {
 322                 if (!(out = BIO_new_file(outfile, outmode))) {
 323                         BIO_printf (bio_err,
 324                                  "Can't open output file %s\n", outfile);
 325                         goto end;
 326                 }
 327         } else out = BIO_new_fp(stdout, BIO_NOCLOSE);
 328
 329         if(operation == SMIME_VERIFY)
 330                 if(!(store = setup_verify(CAfile, CApath))) goto end;
 331
 332         ret = 3;
 333
 334         if(operation == SMIME_ENCRYPT) {
 335                 p7 = PKCS7_encrypt(encerts, in, cipher, flags);
 336         } else if(operation == SMIME_SIGN) {
 337                 p7 = PKCS7_sign(signer, key, other, in, flags);
 338                 BIO_reset(in);
 339         } else {
 340                 if(!(p7 = SMIME_read_PKCS7(in, &indata))) {
 341                         BIO_printf(bio_err, "Error reading S/MIME message\n");
 342                         goto end;
 343                 }
 344         }
 345
 346         if(!p7) {
 347                 BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
 348                 goto end;
 349         }
 350
 351         ret = 4;
 352         if(operation == SMIME_DECRYPT) {
 353                 if(!PKCS7_decrypt(p7, key, recip, out, flags)) {
 354                         BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
 355                         goto end;
 356                 }
 357         } else if(operation == SMIME_VERIFY) {
 358                 STACK_OF(X509) *signers;
 359                 if(PKCS7_verify(p7, other, store, indata, out, flags)) {
 360                         BIO_printf(bio_err, "Verification Successful\n");
 361                 } else {
 362                         BIO_printf(bio_err, "Verification Failure\n");
 363                         goto end;
 364                 }
 365                 signers = PKCS7_iget_signers(p7, other, flags);
 366                 if(!save_certs(signerfile, signers)) {
 367                         BIO_printf(bio_err, "Error writing signers to %s\n",
 368                                                                 signerfile);
 369                         ret = 5;
 370                         goto end;
 371                 }
 372                 sk_X509_free(signers);
 373         } else if(operation == SMIME_PK7OUT) {
 374                 PEM_write_bio_PKCS7(out, p7);
 375         } else {
 376                 if(to) BIO_printf(out, "To: %s\n", to);
 377                 if(from) BIO_printf(out, "From: %s\n", from);
 378                 if(subject) BIO_printf(out, "Subject: %s\n", subject);
 379                 SMIME_write_PKCS7(out, p7, in, flags);
 380         }
 381         ret = 0;
 382 end:
 383         if(ret) ERR_print_errors(bio_err);
 384         sk_X509_pop_free(encerts, X509_free);
 385         sk_X509_pop_free(other, X509_free);
 386         X509_STORE_free(store);
 387         X509_free(cert);
 388         X509_free(recip);
 389         X509_free(signer);
 390         EVP_PKEY_free(key);
 391         PKCS7_free(p7);
 392         BIO_free(in);
 393         BIO_free(indata);
 394         BIO_free(out);
 395         return (ret);
 396 }
 397
 398 static X509 *load_cert(char *file)
 399 {
 400         BIO *in;
 401         X509 *cert;
 402         if(!(in = BIO_new_file(file, "r"))) return NULL;
 403         cert = PEM_read_bio_X509(in, NULL, NULL,NULL);
 404         BIO_free(in);
 405         return cert;
 406 }
 407
 408 static EVP_PKEY *load_key(char *file)
 409 {
 410         BIO *in;
 411         EVP_PKEY *key;
 412         if(!(in = BIO_new_file(file, "r"))) return NULL;
 413         key = PEM_read_bio_PrivateKey(in, NULL, NULL,NULL);
 414         BIO_free(in);
 415         return key;
 416 }
 417
 418 static STACK_OF(X509) *load_certs(char *file)
 419 {
 420         BIO *in;
 421         int i;
 422         STACK_OF(X509) *othercerts;
 423         STACK_OF(X509_INFO) *allcerts;
 424         X509_INFO *xi;
 425         if(!(in = BIO_new_file(file, "r"))) return NULL;
 426         othercerts = sk_X509_new(NULL);
 427         if(!othercerts) return NULL;
 428         allcerts = PEM_X509_INFO_read_bio(in, NULL, NULL, NULL);
 429         for(i = 0; i < sk_X509_INFO_num(allcerts); i++) {
 430                 xi = sk_X509_INFO_value (allcerts, i);
 431                 if (xi->x509) {
 432                         sk_X509_push(othercerts, xi->x509);
 433                         xi->x509 = NULL;
 434                 }
 435         }
 436         sk_X509_INFO_pop_free(allcerts, X509_INFO_free);
 437         BIO_free(in);
 438         return othercerts;
 439 }
 440
 441 static X509_STORE *setup_verify(char *CAfile, char *CApath)
 442 {
 443         X509_STORE *store;
 444         X509_LOOKUP *lookup;
 445         if(!(store = X509_STORE_new())) goto end;
 446         lookup=X509_STORE_add_lookup(store,X509_LOOKUP_file());
 447         if (lookup == NULL) goto end;
 448         if (CAfile) {
 449                 if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) {
 450                         BIO_printf(bio_err, "Error loading file %s\n", CAfile);
 451                         goto end;
 452                 }
 453         } else X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT);
 454
 455         lookup=X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir());
 456         if (lookup == NULL) goto end;
 457         if (CApath) {
 458                 if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) {
 459                         BIO_printf(bio_err, "Error loading directory %s\n", CApath);
 460                         goto end;
 461                 }
 462         } else X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT);
 463
 464         ERR_clear_error();
 465         return store;
 466         end:
 467         X509_STORE_free(store);
 468         return NULL;
 469 }
 470
 471 int save_certs(char *signerfile, STACK_OF(X509) *signers)
 472 {
 473         int i;
 474         BIO *tmp;
 475         if(!signerfile) return 1;
 476         tmp = BIO_new_file(signerfile, "w");
 477         if(!tmp) return 0;
 478         for(i = 0; i < sk_X509_num(signers); i++)
 479                 PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
 480         BIO_free(tmp);
 481         return 1;
 482 }
 483