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/pem.h>
  65 #include <openssl/err.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, char *pass);
  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, *passin = 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 #ifndef NO_DES
 114                 else if (!strcmp (*args, "-des3"))
 115                                 cipher = EVP_des_ede3_cbc();
 116                 else if (!strcmp (*args, "-des"))
 117                                 cipher = EVP_des_cbc();
 118 #endif
 119 #ifndef NO_RC2
 120                 else if (!strcmp (*args, "-rc2-40"))
 121                                 cipher = EVP_rc2_40_cbc();
 122                 else if (!strcmp (*args, "-rc2-128"))
 123                                 cipher = EVP_rc2_cbc();
 124                 else if (!strcmp (*args, "-rc2-64"))
 125                                 cipher = EVP_rc2_64_cbc();
 126 #endif
 127                 else if (!strcmp (*args, "-text"))
 128                                 flags |= PKCS7_TEXT;
 129                 else if (!strcmp (*args, "-nointern"))
 130                                 flags |= PKCS7_NOINTERN;
 131                 else if (!strcmp (*args, "-noverify"))
 132                                 flags |= PKCS7_NOVERIFY;
 133                 else if (!strcmp (*args, "-nochain"))
 134                                 flags |= PKCS7_NOCHAIN;
 135                 else if (!strcmp (*args, "-nocerts"))
 136                                 flags |= PKCS7_NOCERTS;
 137                 else if (!strcmp (*args, "-noattr"))
 138                                 flags |= PKCS7_NOATTR;
 139                 else if (!strcmp (*args, "-nodetach"))
 140                                 flags &= ~PKCS7_DETACHED;
 141                 else if (!strcmp (*args, "-binary"))
 142                                 flags |= PKCS7_BINARY;
 143                 else if (!strcmp (*args, "-nosigs"))
 144                                 flags |= PKCS7_NOSIGS;
 145                 else if (!strcmp(*argv,"-passin")) {
 146                         if (--argc < 1) badarg = 1;
 147                         else passin= *(++argv);
 148                 } else if (!strcmp(*argv,"-envpassin")) {
 149                         if (--argc < 1) badarg = 1;
 150                         else if(!(passin= getenv(*(++argv)))) {
 151                                 BIO_printf(bio_err,
 152                                  "Can't read environment variable %s\n",
 153                                                                 *argv);
 154                                 badarg = 1;
 155                         }
 156                 } else if (!strcmp (*args, "-to")) {
 157                         if (args[1]) {
 158                                 args++;
 159                                 to = *args;
 160                         } else badarg = 1;
 161                 } else if (!strcmp (*args, "-from")) {
 162                         if (args[1]) {
 163                                 args++;
 164                                 from = *args;
 165                         } else badarg = 1;
 166                 } else if (!strcmp (*args, "-subject")) {
 167                         if (args[1]) {
 168                                 args++;
 169                                 subject = *args;
 170                         } else badarg = 1;
 171                 } else if (!strcmp (*args, "-signer")) {
 172                         if (args[1]) {
 173                                 args++;
 174                                 signerfile = *args;
 175                         } else badarg = 1;
 176                 } else if (!strcmp (*args, "-recip")) {
 177                         if (args[1]) {
 178                                 args++;
 179                                 recipfile = *args;
 180                         } else badarg = 1;
 181                 } else if (!strcmp (*args, "-inkey")) {
 182                         if (args[1]) {
 183                                 args++;
 184                                 keyfile = *args;
 185                         } else badarg = 1;
 186                 } else if (!strcmp (*args, "-certfile")) {
 187                         if (args[1]) {
 188                                 args++;
 189                                 certfile = *args;
 190                         } else badarg = 1;
 191                 } else if (!strcmp (*args, "-CAfile")) {
 192                         if (args[1]) {
 193                                 args++;
 194                                 CAfile = *args;
 195                         } else badarg = 1;
 196                 } else if (!strcmp (*args, "-CApath")) {
 197                         if (args[1]) {
 198                                 args++;
 199                                 CApath = *args;
 200                         } else badarg = 1;
 201                 } else if (!strcmp (*args, "-in")) {
 202                         if (args[1]) {
 203                                 args++;
 204                                 infile = *args;
 205                         } else badarg = 1;
 206                 } else if (!strcmp (*args, "-out")) {
 207                         if (args[1]) {
 208                                 args++;
 209                                 outfile = *args;
 210                         } else badarg = 1;
 211                 } else badarg = 1;
 212                 args++;
 213         }
 214
 215         if(operation == SMIME_SIGN) {
 216                 if(!signerfile) {
 217                         BIO_printf(bio_err, "No signer certificate specified\n");
 218                         badarg = 1;
 219                 }
 220         } else if(operation == SMIME_DECRYPT) {
 221                 if(!recipfile) {
 222                         BIO_printf(bio_err, "No recipient certificate and key specified\n");
 223                         badarg = 1;
 224                 }
 225         } else if(operation == SMIME_ENCRYPT) {
 226                 if(!*args) {
 227                         BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
 228                         badarg = 1;
 229                 }
 230         } else if(!operation) badarg = 1;
 231
 232         if (badarg) {
 233                 BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n");
 234                 BIO_printf (bio_err, "where options are\n");
 235                 BIO_printf (bio_err, "-encrypt       encrypt message\n");
 236                 BIO_printf (bio_err, "-decrypt       decrypt encrypted message\n");
 237                 BIO_printf (bio_err, "-sign          sign message\n");
 238                 BIO_printf (bio_err, "-verify        verify signed message\n");
 239                 BIO_printf (bio_err, "-pk7out        output PKCS#7 structure\n");
 240 #ifndef NO_DES
 241                 BIO_printf (bio_err, "-des3          encrypt with triple DES\n");
 242                 BIO_printf (bio_err, "-des           encrypt with DES\n");
 243 #endif
 244 #ifndef NO_RC2
 245                 BIO_printf (bio_err, "-rc2-40        encrypt with RC2-40 (default)\n");
 246                 BIO_printf (bio_err, "-rc2-64        encrypt with RC2-64\n");
 247                 BIO_printf (bio_err, "-rc2-128       encrypt with RC2-128\n");
 248 #endif
 249                 BIO_printf (bio_err, "-nointern      don't search certificates in message for signer\n");
 250                 BIO_printf (bio_err, "-nosigs        don't verify message signature\n");
 251                 BIO_printf (bio_err, "-noverify      don't verify signers certificate\n");
 252                 BIO_printf (bio_err, "-nocerts       don't include signers certificate when signing\n");
 253                 BIO_printf (bio_err, "-nodetach      use opaque signing\n");
 254                 BIO_printf (bio_err, "-noattr        don't include any signed attributes\n");
 255                 BIO_printf (bio_err, "-binary        don't translate message to text\n");
 256                 BIO_printf (bio_err, "-in file       input file\n");
 257                 BIO_printf (bio_err, "-certfile file other certificates file\n");
 258                 BIO_printf (bio_err, "-signer file   signer certificate file\n");
 259                 BIO_printf (bio_err, "-recip  file   recipient certificate file\n");
 260                 BIO_printf (bio_err, "-in file       input file\n");
 261                 BIO_printf (bio_err, "-inkey file    input private key (if not signer or recipient)\n");
 262                 BIO_printf (bio_err, "-out file      output file\n");
 263                 BIO_printf (bio_err, "-to addr       to address\n");
 264                 BIO_printf (bio_err, "-from ad       from address\n");
 265                 BIO_printf (bio_err, "-subject s     subject\n");
 266                 BIO_printf (bio_err, "-text          include or delete text MIME headers\n");
 267                 BIO_printf (bio_err, "-CApath dir    trusted certificates directory\n");
 268                 BIO_printf (bio_err, "-CAfile file   trusted certificates file\n");
 269                 BIO_printf (bio_err, "cert.pem       recipient certificate(s)\n");
 270                 goto end;
 271         }
 272
 273         ret = 2;
 274
 275         if(operation != SMIME_SIGN) flags &= ~PKCS7_DETACHED;
 276
 277         if(flags & PKCS7_BINARY) {
 278                 if(operation & SMIME_OP) inmode = "rb";
 279                 else outmode = "rb";
 280         }
 281
 282         if(operation == SMIME_ENCRYPT) {
 283                 if (!cipher) {
 284 #ifndef NO_RC2
 285                         cipher = EVP_rc2_40_cbc();
 286 #else
 287                         BIO_printf(bio_err, "No cipher selected\n");
 288                         goto end;
 289 #endif
 290                 }
 291                 encerts = sk_X509_new_null();
 292                 while (*args) {
 293                         if(!(cert = load_cert(*args))) {
 294                                 BIO_printf(bio_err, "Can't read recipent certificate file %s\n", *args);
 295                                 goto end;
 296                         }
 297                         sk_X509_push(encerts, cert);
 298                         cert = NULL;
 299                         args++;
 300                 }
 301         }
 302
 303         if(signerfile && (operation == SMIME_SIGN)) {
 304                 if(!(signer = load_cert(signerfile))) {
 305                         BIO_printf(bio_err, "Can't read signer certificate file %s\n", signerfile);
 306                         goto end;
 307                 }
 308         }
 309
 310         if(certfile) {
 311                 if(!(other = load_certs(certfile))) {
 312                         BIO_printf(bio_err, "Can't read certificate file %s\n", certfile);
 313                         ERR_print_errors(bio_err);
 314                         goto end;
 315                 }
 316         }
 317
 318         if(recipfile && (operation == SMIME_DECRYPT)) {
 319                 if(!(recip = load_cert(recipfile))) {
 320                         BIO_printf(bio_err, "Can't read recipient certificate file %s\n", recipfile);
 321                         ERR_print_errors(bio_err);
 322                         goto end;
 323                 }
 324         }
 325
 326         if(operation == SMIME_DECRYPT) {
 327                 if(!keyfile) keyfile = recipfile;
 328         } else if(operation == SMIME_SIGN) {
 329                 if(!keyfile) keyfile = signerfile;
 330         } else keyfile = NULL;
 331
 332         if(keyfile) {
 333                 if(!(key = load_key(keyfile, passin))) {
 334                         BIO_printf(bio_err, "Can't read recipient certificate file %s\n", keyfile);
 335                         ERR_print_errors(bio_err);
 336                         goto end;
 337                 }
 338         }
 339
 340         if (infile) {
 341                 if (!(in = BIO_new_file(infile, inmode))) {
 342                         BIO_printf (bio_err,
 343                                  "Can't open input file %s\n", infile);
 344                         goto end;
 345                 }
 346         } else in = BIO_new_fp(stdin, BIO_NOCLOSE);
 347
 348         if (outfile) {
 349                 if (!(out = BIO_new_file(outfile, outmode))) {
 350                         BIO_printf (bio_err,
 351                                  "Can't open output file %s\n", outfile);
 352                         goto end;
 353                 }
 354         } else out = BIO_new_fp(stdout, BIO_NOCLOSE);
 355
 356         if(operation == SMIME_VERIFY)
 357                 if(!(store = setup_verify(CAfile, CApath))) goto end;
 358
 359         ret = 3;
 360
 361         if(operation == SMIME_ENCRYPT) {
 362                 p7 = PKCS7_encrypt(encerts, in, cipher, flags);
 363         } else if(operation == SMIME_SIGN) {
 364                 p7 = PKCS7_sign(signer, key, other, in, flags);
 365                 BIO_reset(in);
 366         } else {
 367                 if(!(p7 = SMIME_read_PKCS7(in, &indata))) {
 368                         BIO_printf(bio_err, "Error reading S/MIME message\n");
 369                         goto end;
 370                 }
 371         }
 372
 373         if(!p7) {
 374                 BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
 375                 goto end;
 376         }
 377
 378         ret = 4;
 379         if(operation == SMIME_DECRYPT) {
 380                 if(!PKCS7_decrypt(p7, key, recip, out, flags)) {
 381                         BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
 382                         goto end;
 383                 }
 384         } else if(operation == SMIME_VERIFY) {
 385                 STACK_OF(X509) *signers;
 386                 if(PKCS7_verify(p7, other, store, indata, out, flags)) {
 387                         BIO_printf(bio_err, "Verification Successful\n");
 388                 } else {
 389                         BIO_printf(bio_err, "Verification Failure\n");
 390                         goto end;
 391                 }
 392                 signers = PKCS7_iget_signers(p7, other, flags);
 393                 if(!save_certs(signerfile, signers)) {
 394                         BIO_printf(bio_err, "Error writing signers to %s\n",
 395                                                                 signerfile);
 396                         ret = 5;
 397                         goto end;
 398                 }
 399                 sk_X509_free(signers);
 400         } else if(operation == SMIME_PK7OUT) {
 401                 PEM_write_bio_PKCS7(out, p7);
 402         } else {
 403                 if(to) BIO_printf(out, "To: %s\n", to);
 404                 if(from) BIO_printf(out, "From: %s\n", from);
 405                 if(subject) BIO_printf(out, "Subject: %s\n", subject);
 406                 SMIME_write_PKCS7(out, p7, in, flags);
 407         }
 408         ret = 0;
 409 end:
 410         if(ret) ERR_print_errors(bio_err);
 411         sk_X509_pop_free(encerts, X509_free);
 412         sk_X509_pop_free(other, X509_free);
 413         X509_STORE_free(store);
 414         X509_free(cert);
 415         X509_free(recip);
 416         X509_free(signer);
 417         EVP_PKEY_free(key);
 418         PKCS7_free(p7);
 419         BIO_free(in);
 420         BIO_free(indata);
 421         BIO_free(out);
 422         return (ret);
 423 }
 424
 425 static X509 *load_cert(char *file)
 426 {
 427         BIO *in;
 428         X509 *cert;
 429         if(!(in = BIO_new_file(file, "r"))) return NULL;
 430         cert = PEM_read_bio_X509(in, NULL, NULL,NULL);
 431         BIO_free(in);
 432         return cert;
 433 }
 434
 435 static EVP_PKEY *load_key(char *file, char *pass)
 436 {
 437         BIO *in;
 438         EVP_PKEY *key;
 439         if(!(in = BIO_new_file(file, "r"))) return NULL;
 440         key = PEM_read_bio_PrivateKey(in, NULL,PEM_cb,pass);
 441         BIO_free(in);
 442         return key;
 443 }
 444
 445 static STACK_OF(X509) *load_certs(char *file)
 446 {
 447         BIO *in;
 448         int i;
 449         STACK_OF(X509) *othercerts;
 450         STACK_OF(X509_INFO) *allcerts;
 451         X509_INFO *xi;
 452         if(!(in = BIO_new_file(file, "r"))) return NULL;
 453         othercerts = sk_X509_new(NULL);
 454         if(!othercerts) return NULL;
 455         allcerts = PEM_X509_INFO_read_bio(in, NULL, NULL, NULL);
 456         for(i = 0; i < sk_X509_INFO_num(allcerts); i++) {
 457                 xi = sk_X509_INFO_value (allcerts, i);
 458                 if (xi->x509) {
 459                         sk_X509_push(othercerts, xi->x509);
 460                         xi->x509 = NULL;
 461                 }
 462         }
 463         sk_X509_INFO_pop_free(allcerts, X509_INFO_free);
 464         BIO_free(in);
 465         return othercerts;
 466 }
 467
 468 static X509_STORE *setup_verify(char *CAfile, char *CApath)
 469 {
 470         X509_STORE *store;
 471         X509_LOOKUP *lookup;
 472         if(!(store = X509_STORE_new())) goto end;
 473         lookup=X509_STORE_add_lookup(store,X509_LOOKUP_file());
 474         if (lookup == NULL) goto end;
 475         if (CAfile) {
 476                 if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) {
 477                         BIO_printf(bio_err, "Error loading file %s\n", CAfile);
 478                         goto end;
 479                 }
 480         } else X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT);
 481
 482         lookup=X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir());
 483         if (lookup == NULL) goto end;
 484         if (CApath) {
 485                 if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) {
 486                         BIO_printf(bio_err, "Error loading directory %s\n", CApath);
 487                         goto end;
 488                 }
 489         } else X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT);
 490
 491         ERR_clear_error();
 492         return store;
 493         end:
 494         X509_STORE_free(store);
 495         return NULL;
 496 }
 497
 498 int save_certs(char *signerfile, STACK_OF(X509) *signers)
 499 {
 500         int i;
 501         BIO *tmp;
 502         if(!signerfile) return 1;
 503         tmp = BIO_new_file(signerfile, "w");
 504         if(!tmp) return 0;
 505         for(i = 0; i < sk_X509_num(signers); i++)
 506                 PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
 507         BIO_free(tmp);
 508         return 1;
 509 }
 510