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
  74 #define SMIME_OP        0x10
  75 #define SMIME_ENCRYPT   (1 | SMIME_OP)
  76 #define SMIME_DECRYPT   2
  77 #define SMIME_SIGN      (3 | SMIME_OP)
  78 #define SMIME_VERIFY    4
  79 #define SMIME_PK7OUT    5
  80
  81 int MAIN(int argc, char **argv)
  82 {
  83         int operation = 0;
  84         int ret = 0;
  85         char **args;
  86         char *inmode = "r", *outmode = "w";
  87         char *infile = NULL, *outfile = NULL;
  88         char *signerfile = NULL, *recipfile = NULL;
  89         char *certfile = NULL, *keyfile = NULL;
  90         EVP_CIPHER *cipher = NULL;
  91         PKCS7 *p7 = NULL;
  92         X509_STORE *store = NULL;
  93         X509 *cert = NULL, *recip = NULL, *signer = NULL;
  94         EVP_PKEY *key = NULL;
  95         STACK_OF(X509) *encerts = NULL, *other = NULL;
  96         BIO *in = NULL, *out = NULL, *indata = NULL;
  97         int badarg = 0;
  98         int flags = PKCS7_DETACHED;
  99         char *to = NULL, *from = NULL, *subject = NULL;
 100         char *CAfile = NULL, *CApath = NULL;
 101
 102         args = argv + 1;
 103
 104         ret = 1;
 105
 106         while (!badarg && *args && *args[0] == '-') {
 107                 if (!strcmp (*args, "-encrypt")) operation = SMIME_ENCRYPT;
 108                 else if (!strcmp (*args, "-decrypt")) operation = SMIME_DECRYPT;
 109                 else if (!strcmp (*args, "-sign")) operation = SMIME_SIGN;
 110                 else if (!strcmp (*args, "-verify")) operation = SMIME_VERIFY;
 111                 else if (!strcmp (*args, "-pk7out")) operation = SMIME_PK7OUT;
 112                 else if (!strcmp (*args, "-des3"))
 113                                 cipher = EVP_des_ede3_cbc();
 114                 else if (!strcmp (*args, "-des"))
 115                                 cipher = EVP_des_cbc();
 116                 else if (!strcmp (*args, "-rc2-40"))
 117                                 cipher = EVP_rc2_40_cbc();
 118                 else if (!strcmp (*args, "-rc2-128"))
 119                                 cipher = EVP_rc2_cbc();
 120                 else if (!strcmp (*args, "-rc2-64"))
 121                                 cipher = EVP_rc2_64_cbc();
 122                 else if (!strcmp (*args, "-text"))
 123                                 flags |= PKCS7_TEXT;
 124                 else if (!strcmp (*args, "-nointern"))
 125                                 flags |= PKCS7_NOINTERN;
 126                 else if (!strcmp (*args, "-noverify"))
 127                                 flags |= PKCS7_NOVERIFY;
 128                 else if (!strcmp (*args, "-nochain"))
 129                                 flags |= PKCS7_NOCHAIN;
 130                 else if (!strcmp (*args, "-nocerts"))
 131                                 flags |= PKCS7_NOCERTS;
 132                 else if (!strcmp (*args, "-noattr"))
 133                                 flags |= PKCS7_NOATTR;
 134                 else if (!strcmp (*args, "-nodetach"))
 135                                 flags &= ~PKCS7_DETACHED;
 136                 else if (!strcmp (*args, "-binary"))
 137                                 flags |= PKCS7_BINARY;
 138                 else if (!strcmp (*args, "-to")) {
 139                         if (args[1]) {
 140                                 args++;
 141                                 to = *args;
 142                         } else badarg = 1;
 143                 } else if (!strcmp (*args, "-from")) {
 144                         if (args[1]) {
 145                                 args++;
 146                                 from = *args;
 147                         } else badarg = 1;
 148                 } else if (!strcmp (*args, "-subject")) {
 149                         if (args[1]) {
 150                                 args++;
 151                                 subject = *args;
 152                         } else badarg = 1;
 153                 } else if (!strcmp (*args, "-signer")) {
 154                         if (args[1]) {
 155                                 args++;
 156                                 signerfile = *args;
 157                         } else badarg = 1;
 158                 } else if (!strcmp (*args, "-recip")) {
 159                         if (args[1]) {
 160                                 args++;
 161                                 recipfile = *args;
 162                         } else badarg = 1;
 163                 } else if (!strcmp (*args, "-inkey")) {
 164                         if (args[1]) {
 165                                 args++;
 166                                 keyfile = *args;
 167                         } else badarg = 1;
 168                 } else if (!strcmp (*args, "-certfile")) {
 169                         if (args[1]) {
 170                                 args++;
 171                                 certfile = *args;
 172                         } else badarg = 1;
 173                 } else if (!strcmp (*args, "-CAfile")) {
 174                         if (args[1]) {
 175                                 args++;
 176                                 CAfile = *args;
 177                         } else badarg = 1;
 178                 } else if (!strcmp (*args, "-CApath")) {
 179                         if (args[1]) {
 180                                 args++;
 181                                 CApath = *args;
 182                         } else badarg = 1;
 183                 } else if (!strcmp (*args, "-in")) {
 184                         if (args[1]) {
 185                                 args++;
 186                                 infile = *args;
 187                         } else badarg = 1;
 188                 } else if (!strcmp (*args, "-out")) {
 189                         if (args[1]) {
 190                                 args++;
 191                                 outfile = *args;
 192                         } else badarg = 1;
 193                 } else badarg = 1;
 194                 args++;
 195         }
 196
 197         if(operation == SMIME_SIGN) {
 198                 if(!signerfile) {
 199                         BIO_printf(bio_err, "No signer certificate specified\n");
 200                         badarg = 1;
 201                 }
 202         } else if(operation == SMIME_DECRYPT) {
 203                 if(!recipfile) {
 204                         BIO_printf(bio_err, "No recipient certificate and key specified\n");
 205                         badarg = 1;
 206                 }
 207         } else if(operation == SMIME_ENCRYPT) {
 208                 if(!*args) {
 209                         BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
 210                         badarg = 1;
 211                 }
 212         } else if(!operation) badarg = 1;
 213
 214         if (badarg) {
 215                 BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n");
 216                 BIO_printf (bio_err, "where options are\n");
 217                 BIO_printf (bio_err, "-encrypt       encrypt message\n");
 218                 BIO_printf (bio_err, "-decrypt       decrypt encrypted message\n");
 219                 BIO_printf (bio_err, "-sign          sign message\n");
 220                 BIO_printf (bio_err, "-verify        verify signed message\n");
 221                 BIO_printf (bio_err, "-pk7out        output PKCS#7 structure\n");
 222                 BIO_printf (bio_err, "-des3          encrypt with triple DES\n");
 223                 BIO_printf (bio_err, "-rc2-40        encrypt with RC2-40\n");
 224                 BIO_printf (bio_err, "-rc2-64        encrypt with RC2-64\n");
 225                 BIO_printf (bio_err, "-rc2-128       encrypt with RC2-128\n");
 226                 BIO_printf (bio_err, "-in file       input file\n");
 227                 BIO_printf (bio_err, "-certfile file other certificates file\n");
 228                 BIO_printf (bio_err, "-signer file   signer certificate file\n");
 229                 BIO_printf (bio_err, "-recip  file   recipient certificate file\n");
 230                 BIO_printf (bio_err, "-in file       input file\n");
 231                 BIO_printf (bio_err, "-inkey file    input private key (if not signer or recipient)\n");
 232                 BIO_printf (bio_err, "-out file      output file\n");
 233                 BIO_printf (bio_err, "-to addr       to address\n");
 234                 BIO_printf (bio_err, "-from ad       from address\n");
 235                 BIO_printf (bio_err, "-subject s     subject\n");
 236                 BIO_printf (bio_err, "-text          include or delete text MIME headers\n");
 237                 BIO_printf (bio_err, "cert.pem       recipient certificate(s)\n");
 238                 goto end;
 239         }
 240
 241         ret = 2;
 242
 243         if(operation != SMIME_SIGN) flags &= ~PKCS7_DETACHED;
 244
 245         if(flags & PKCS7_BINARY) {
 246                 if(operation & SMIME_OP) inmode = "rb";
 247                 else outmode = "rb";
 248         }
 249
 250         if(operation == SMIME_ENCRYPT) {
 251                 if (!cipher) cipher = EVP_rc2_40_cbc();
 252                 while (*args) {
 253                         encerts = sk_X509_new_null();
 254                         if(!(cert = load_cert(*args))) {
 255                                 BIO_printf(bio_err, "Can't read recipent certificate file %s\n", *args);
 256                                 goto end;
 257                         }
 258                         sk_X509_push (encerts, cert);
 259                         cert = NULL;
 260                         args++;
 261                 }
 262         }
 263
 264         if(signerfile) {
 265                 if(!(signer = load_cert(signerfile))) {
 266                         BIO_printf(bio_err, "Can't read signer certificate file %s\n", signerfile);
 267                         goto end;
 268                 }
 269         }
 270
 271         if(certfile) {
 272                 if(!(other = load_certs(certfile))) {
 273                         BIO_printf(bio_err, "Can't read certificate file %s\n", certfile);
 274                         ERR_print_errors(bio_err);
 275                         goto end;
 276                 }
 277         }
 278
 279         if(recipfile) {
 280                 if(!(recip = load_cert(recipfile))) {
 281                         BIO_printf(bio_err, "Can't read recipient certificate file %s\n", recipfile);
 282                         ERR_print_errors(bio_err);
 283                         goto end;
 284                 }
 285         }
 286
 287         if(operation == SMIME_DECRYPT) {
 288                 if(!keyfile) keyfile = recipfile;
 289         } else if(operation == SMIME_SIGN) {
 290                 if(!keyfile) keyfile = signerfile;
 291         } else keyfile = NULL;
 292
 293         if(keyfile) {
 294                 if(!(key = load_key(keyfile))) {
 295                         BIO_printf(bio_err, "Can't read recipient certificate file %s\n", keyfile);
 296                         ERR_print_errors(bio_err);
 297                         goto end;
 298                 }
 299         }
 300
 301         if (infile) {
 302                 if (!(in = BIO_new_file(infile, inmode))) {
 303                         BIO_printf (bio_err,
 304                                  "Can't open input file %s\n", infile);
 305                         goto end;
 306                 }
 307         } else in = BIO_new_fp(stdin, BIO_NOCLOSE);
 308
 309         if (outfile) {
 310                 if (!(out = BIO_new_file(outfile, outmode))) {
 311                         BIO_printf (bio_err,
 312                                  "Can't open output file %s\n", outfile);
 313                         goto end;
 314                 }
 315         } else out = BIO_new_fp(stdout, BIO_NOCLOSE);
 316
 317         if(operation == SMIME_VERIFY)
 318                 if(!(store = setup_verify(CAfile, CApath))) goto end;
 319
 320         ret = 3;
 321         if(operation == SMIME_ENCRYPT) {
 322                 p7 = PKCS7_encrypt(encerts, in, cipher, flags);
 323         } else if(operation == SMIME_SIGN) {
 324                 p7 = PKCS7_sign(signer, key, other, in, flags);
 325                 BIO_reset(in);
 326         } else {
 327                 if(!(p7 = SMIME_read_PKCS7(in, &indata))) {
 328                         BIO_printf(bio_err, "Error reading S/MIME message\n");
 329                         ret = 4;
 330                         goto end;
 331                 }
 332         }
 333
 334         if(!p7) {
 335                 BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
 336                 goto end;
 337         }
 338
 339         if(operation == SMIME_DECRYPT) {
 340                 if(!PKCS7_decrypt(p7, key, recip, out, flags))
 341                         BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
 342                 else ret = 0;
 343         } else if(operation == SMIME_VERIFY) {
 344                 if(PKCS7_verify(p7, other, store, indata, out, flags)) {
 345                         BIO_printf(bio_err, "Verification Successful\n");
 346                         ret = 0;
 347                 } else {
 348                         BIO_printf(bio_err, "Verification Failure\n");
 349                         ret = 5;
 350                 }
 351         } else if(operation == SMIME_PK7OUT) {
 352                 PEM_write_bio_PKCS7(out, p7);
 353         } else {
 354                 if(to) BIO_printf(out, "To: %s\n", to);
 355                 if(from) BIO_printf(out, "From: %s\n", from);
 356                 if(subject) BIO_printf(out, "Subject: %s\n", subject);
 357                 SMIME_write_PKCS7(out, p7, in, flags);
 358         }
 359 end:
 360         if(ret) ERR_print_errors(bio_err);
 361         sk_X509_pop_free(encerts, X509_free);
 362         sk_X509_pop_free(other, X509_free);
 363         X509_STORE_free(store);
 364         X509_free(cert);
 365         X509_free(recip);
 366         X509_free(signer);
 367         EVP_PKEY_free(key);
 368         PKCS7_free(p7);
 369         BIO_free(in);
 370         BIO_free(indata);
 371         BIO_free(out);
 372         return (ret);
 373 }
 374
 375 static X509 *load_cert(char *file)
 376 {
 377         BIO *in;
 378         X509 *cert;
 379         if(!(in = BIO_new_file(file, "r"))) return NULL;
 380         cert = PEM_read_bio_X509(in, NULL, NULL,NULL);
 381         BIO_free(in);
 382         return cert;
 383 }
 384
 385 static EVP_PKEY *load_key(char *file)
 386 {
 387         BIO *in;
 388         EVP_PKEY *key;
 389         if(!(in = BIO_new_file(file, "r"))) return NULL;
 390         key = PEM_read_bio_PrivateKey(in, NULL, NULL,NULL);
 391         BIO_free(in);
 392         return key;
 393 }
 394
 395 static STACK_OF(X509) *load_certs(char *file)
 396 {
 397         BIO *in;
 398         int i;
 399         STACK_OF(X509) *othercerts;
 400         STACK_OF(X509_INFO) *allcerts;
 401         X509_INFO *xi;
 402         if(!(in = BIO_new_file(file, "r"))) return NULL;
 403         othercerts = sk_X509_new(NULL);
 404         if(!othercerts) return NULL;
 405         allcerts = PEM_X509_INFO_read_bio(in, NULL, NULL, NULL);
 406         for(i = 0; i < sk_X509_INFO_num(allcerts); i++) {
 407                 xi = sk_X509_INFO_value (allcerts, i);
 408                 if (xi->x509) {
 409                         sk_X509_push(othercerts, xi->x509);
 410                         xi->x509 = NULL;
 411                 }
 412         }
 413         sk_X509_INFO_pop_free(allcerts, X509_INFO_free);
 414         BIO_free(in);
 415         return othercerts;
 416 }
 417
 418 static X509_STORE *setup_verify(char *CAfile, char *CApath)
 419 {
 420         X509_STORE *store;
 421         X509_LOOKUP *lookup;
 422         if(!(store = X509_STORE_new())) goto end;
 423         lookup=X509_STORE_add_lookup(store,X509_LOOKUP_file());
 424         if (lookup == NULL) goto end;
 425         if (CAfile) {
 426                 if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) {
 427                         BIO_printf(bio_err, "Error loading file %s\n", CAfile);
 428                         goto end;
 429                 }
 430         } else X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT);
 431
 432         lookup=X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir());
 433         if (lookup == NULL) goto end;
 434         if (CApath) {
 435                 if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) {
 436                         BIO_printf(bio_err, "Error loading directory %s\n", CApath);
 437                         goto end;
 438                 }
 439         } else X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT);
 440
 441         ERR_clear_error();
 442         return store;
 443         end:
 444         X509_STORE_free(store);
 445         return NULL;
 446 }