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