apps/smime.c

   1 /* smime.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1999-2004 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 #include <openssl/x509_vfy.h>
  68 #include <openssl/x509v3.h>
  69
  70 #undef PROG
  71 #define PROG smime_main
  72 static int save_certs(char *signerfile, STACK_OF(X509) *signers);
  73 static int smime_cb(int ok, X509_STORE_CTX *ctx);
  74
  75 #define SMIME_OP        0x10
  76 #define SMIME_IP        0x20
  77 #define SMIME_SIGNERS   0x40
  78 #define SMIME_ENCRYPT   (1 | SMIME_OP)
  79 #define SMIME_DECRYPT   (2 | SMIME_IP)
  80 #define SMIME_SIGN      (3 | SMIME_OP | SMIME_SIGNERS)
  81 #define SMIME_VERIFY    (4 | SMIME_IP)
  82 #define SMIME_PK7OUT    (5 | SMIME_IP | SMIME_OP)
  83 #define SMIME_RESIGN    (6 | SMIME_IP | SMIME_OP | SMIME_SIGNERS)
  84
  85 int MAIN(int, char **);
  86
  87 int MAIN(int argc, char **argv)
  88         {
  89         ENGINE *e = NULL;
  90         int operation = 0;
  91         int ret = 0;
  92         char **args;
  93         const char *inmode = "r", *outmode = "w";
  94         char *infile = NULL, *outfile = NULL;
  95         char *signerfile = NULL, *recipfile = NULL;
  96         STACK *sksigners = NULL, *skkeys = NULL;
  97         char *certfile = NULL, *keyfile = NULL, *contfile=NULL;
  98         const EVP_CIPHER *cipher = NULL;
  99         PKCS7 *p7 = NULL;
 100         X509_STORE *store = NULL;
 101         X509 *cert = NULL, *recip = NULL, *signer = NULL;
 102         EVP_PKEY *key = NULL;
 103         STACK_OF(X509) *encerts = NULL, *other = NULL;
 104         BIO *in = NULL, *out = NULL, *indata = NULL;
 105         int badarg = 0;
 106         int flags = PKCS7_DETACHED;
 107         char *to = NULL, *from = NULL, *subject = NULL;
 108         char *CAfile = NULL, *CApath = NULL;
 109         char *passargin = NULL, *passin = NULL;
 110         char *inrand = NULL;
 111         int need_rand = 0;
 112         const EVP_MD *sign_md = NULL;
 113         int informat = FORMAT_SMIME, outformat = FORMAT_SMIME;
 114         int keyform = FORMAT_PEM;
 115 #ifndef OPENSSL_NO_ENGINE
 116         char *engine=NULL;
 117 #endif
 118
 119         X509_VERIFY_PARAM *vpm = NULL;
 120
 121         args = argv + 1;
 122         ret = 1;
 123
 124         apps_startup();
 125
 126         if (bio_err == NULL)
 127                 {
 128                 if ((bio_err = BIO_new(BIO_s_file())) != NULL)
 129                         BIO_set_fp(bio_err, stderr, BIO_NOCLOSE|BIO_FP_TEXT);
 130                 }
 131
 132         if (!load_config(bio_err, NULL))
 133                 goto end;
 134
 135         while (!badarg && *args && *args[0] == '-')
 136                 {
 137                 if (!strcmp (*args, "-encrypt"))
 138                         operation = SMIME_ENCRYPT;
 139                 else if (!strcmp (*args, "-decrypt"))
 140                         operation = SMIME_DECRYPT;
 141                 else if (!strcmp (*args, "-sign"))
 142                         operation = SMIME_SIGN;
 143                 else if (!strcmp (*args, "-resign"))
 144                         operation = SMIME_RESIGN;
 145                 else if (!strcmp (*args, "-verify"))
 146                         operation = SMIME_VERIFY;
 147                 else if (!strcmp (*args, "-pk7out"))
 148                         operation = SMIME_PK7OUT;
 149 #ifndef OPENSSL_NO_DES
 150                 else if (!strcmp (*args, "-des3"))
 151                                 cipher = EVP_des_ede3_cbc();
 152                 else if (!strcmp (*args, "-des"))
 153                                 cipher = EVP_des_cbc();
 154 #endif
 155 #ifndef OPENSSL_NO_RC2
 156                 else if (!strcmp (*args, "-rc2-40"))
 157                                 cipher = EVP_rc2_40_cbc();
 158                 else if (!strcmp (*args, "-rc2-128"))
 159                                 cipher = EVP_rc2_cbc();
 160                 else if (!strcmp (*args, "-rc2-64"))
 161                                 cipher = EVP_rc2_64_cbc();
 162 #endif
 163 #ifndef OPENSSL_NO_AES
 164                 else if (!strcmp(*args,"-aes128"))
 165                                 cipher = EVP_aes_128_cbc();
 166                 else if (!strcmp(*args,"-aes192"))
 167                                 cipher = EVP_aes_192_cbc();
 168                 else if (!strcmp(*args,"-aes256"))
 169                                 cipher = EVP_aes_256_cbc();
 170 #endif
 171                 else if (!strcmp (*args, "-text"))
 172                                 flags |= PKCS7_TEXT;
 173                 else if (!strcmp (*args, "-nointern"))
 174                                 flags |= PKCS7_NOINTERN;
 175                 else if (!strcmp (*args, "-noverify"))
 176                                 flags |= PKCS7_NOVERIFY;
 177                 else if (!strcmp (*args, "-nochain"))
 178                                 flags |= PKCS7_NOCHAIN;
 179                 else if (!strcmp (*args, "-nocerts"))
 180                                 flags |= PKCS7_NOCERTS;
 181                 else if (!strcmp (*args, "-noattr"))
 182                                 flags |= PKCS7_NOATTR;
 183                 else if (!strcmp (*args, "-nodetach"))
 184                                 flags &= ~PKCS7_DETACHED;
 185                 else if (!strcmp (*args, "-nosmimecap"))
 186                                 flags |= PKCS7_NOSMIMECAP;
 187                 else if (!strcmp (*args, "-binary"))
 188                                 flags |= PKCS7_BINARY;
 189                 else if (!strcmp (*args, "-nosigs"))
 190                                 flags |= PKCS7_NOSIGS;
 191                 else if (!strcmp (*args, "-nooldmime"))
 192                                 flags |= PKCS7_NOOLDMIMETYPE;
 193                 else if (!strcmp (*args, "-crlfeol"))
 194                                 flags |= PKCS7_CRLFEOL;
 195                 else if (!strcmp(*args,"-rand"))
 196                         {
 197                         if (!args[1])
 198                                 goto argerr;
 199                         args++;
 200                         inrand = *args;
 201                         need_rand = 1;
 202                         }
 203 #ifndef OPENSSL_NO_ENGINE
 204                 else if (!strcmp(*args,"-engine"))
 205                         {
 206                         if (!args[1])
 207                                 goto argerr;
 208                         engine = *++args;
 209                         }
 210 #endif
 211                 else if (!strcmp(*args,"-passin"))
 212                         {
 213                         if (!args[1])
 214                                 goto argerr;
 215                         passargin = *++args;
 216                         }
 217                 else if (!strcmp (*args, "-to"))
 218                         {
 219                         if (!args[1])
 220                                 goto argerr;
 221                         to = *++args;
 222                         }
 223                 else if (!strcmp (*args, "-from"))
 224                         {
 225                         if (!args[1])
 226                                 goto argerr;
 227                         from = *++args;
 228                         }
 229                 else if (!strcmp (*args, "-subject"))
 230                         {
 231                         if (!args[1])
 232                                 goto argerr;
 233                         subject = *++args;
 234                         }
 235                 else if (!strcmp (*args, "-signer"))
 236                         {
 237                         if (!args[1])
 238                                 goto argerr;
 239                         /* If previous -signer argument add signer to list */
 240
 241                         if (signerfile)
 242                                 {
 243                                 if (!sksigners)
 244                                         sksigners = sk_new_null();
 245                                 sk_push(sksigners, signerfile);
 246                                 if (!keyfile)
 247                                         keyfile = signerfile;
 248                                 if (!skkeys)
 249                                         skkeys = sk_new_null();
 250                                 sk_push(skkeys, keyfile);
 251                                 keyfile = NULL;
 252                                 }
 253                         signerfile = *++args;
 254                         }
 255                 else if (!strcmp (*args, "-recip"))
 256                         {
 257                         if (!args[1])
 258                                 goto argerr;
 259                         recipfile = *++args;
 260                         }
 261                 else if (!strcmp (*args, "-md"))
 262                         {
 263                         if (!args[1])
 264                                 goto argerr;
 265                         sign_md = EVP_get_digestbyname(*++args);
 266                         if (sign_md == NULL)
 267                                 {
 268                                 BIO_printf(bio_err, "Unknown digest %s\n",
 269                                                         *args);
 270                                 goto argerr;
 271                                 }
 272                         }
 273                 else if (!strcmp (*args, "-inkey"))
 274                         {
 275                         if (!args[1])
 276                                 goto argerr;
 277                         /* If previous -inkey arument add signer to list */
 278                         if (keyfile)
 279                                 {
 280                                 if (!signerfile)
 281                                         {
 282                                         BIO_puts(bio_err, "Illegal -inkey without -signer\n");
 283                                         goto argerr;
 284                                         }
 285                                 if (!sksigners)
 286                                         sksigners = sk_new_null();
 287                                 sk_push(sksigners, signerfile);
 288                                 signerfile = NULL;
 289                                 if (!skkeys)
 290                                         skkeys = sk_new_null();
 291                                 sk_push(skkeys, keyfile);
 292                                 }
 293                         keyfile = *++args;
 294                         }
 295                 else if (!strcmp (*args, "-keyform"))
 296                         {
 297                         if (!args[1])
 298                                 goto argerr;
 299                         keyform = str2fmt(*++args);
 300                         }
 301                 else if (!strcmp (*args, "-certfile"))
 302                         {
 303                         if (!args[1])
 304                                 goto argerr;
 305                         certfile = *++args;
 306                         }
 307                 else if (!strcmp (*args, "-CAfile"))
 308                         {
 309                         if (!args[1])
 310                                 goto argerr;
 311                         CAfile = *++args;
 312                         }
 313                 else if (!strcmp (*args, "-CApath"))
 314                         {
 315                         if (!args[1])
 316                                 goto argerr;
 317                         CApath = *++args;
 318                         }
 319                 else if (!strcmp (*args, "-in"))
 320                         {
 321                         if (!args[1])
 322                                 goto argerr;
 323                         infile = *++args;
 324                         }
 325                 else if (!strcmp (*args, "-inform"))
 326                         {
 327                         if (!args[1])
 328                                 goto argerr;
 329                         informat = str2fmt(*++args);
 330                         }
 331                 else if (!strcmp (*args, "-outform"))
 332                         {
 333                         if (!args[1])
 334                                 goto argerr;
 335                         outformat = str2fmt(*++args);
 336                         }
 337                 else if (!strcmp (*args, "-out"))
 338                         {
 339                         if (!args[1])
 340                                 goto argerr;
 341                         outfile = *++args;
 342                         }
 343                 else if (!strcmp (*args, "-content"))
 344                         {
 345                         if (!args[1])
 346                                 goto argerr;
 347                         contfile = *++args;
 348                         }
 349                 else if (args_verify(&args, NULL, &badarg, bio_err, &vpm))
 350                         continue;
 351                 else
 352                         badarg = 1;
 353                 args++;
 354                 }
 355
 356         if (!(operation & SMIME_SIGNERS) && (skkeys || sksigners))
 357                 {
 358                 BIO_puts(bio_err, "Multiple signers or keys not allowed\n");
 359                 goto argerr;
 360                 }
 361
 362         if (operation & SMIME_SIGNERS)
 363                 {
 364                 /* Check to see if any final signer needs to be appended */
 365                 if (keyfile && !signerfile)
 366                         {
 367                         BIO_puts(bio_err, "Illegal -inkey without -signer\n");
 368                         goto argerr;
 369                         }
 370                 if (signerfile)
 371                         {
 372                         if (!sksigners)
 373                                 sksigners = sk_new_null();
 374                         sk_push(sksigners, signerfile);
 375                         if (!skkeys)
 376                                 skkeys = sk_new_null();
 377                         if (!keyfile)
 378                                 keyfile = signerfile;
 379                         sk_push(skkeys, keyfile);
 380                         }
 381                 if (!sksigners)
 382                         {
 383                         BIO_printf(bio_err, "No signer certificate specified\n");
 384                         badarg = 1;
 385                         }
 386                 signerfile = NULL;
 387                 keyfile = NULL;
 388                 need_rand = 1;
 389                 }
 390         else if (operation == SMIME_DECRYPT)
 391                 {
 392                 if (!recipfile && !keyfile)
 393                         {
 394                         BIO_printf(bio_err, "No recipient certificate or key specified\n");
 395                         badarg = 1;
 396                         }
 397                 }
 398         else if (operation == SMIME_ENCRYPT)
 399                 {
 400                 if (!*args)
 401                         {
 402                         BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
 403                         badarg = 1;
 404                         }
 405                 need_rand = 1;
 406                 }
 407         else if (!operation)
 408                 badarg = 1;
 409
 410         if (badarg)
 411                 {
 412                 argerr:
 413                 BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n");
 414                 BIO_printf (bio_err, "where options are\n");
 415                 BIO_printf (bio_err, "-encrypt       encrypt message\n");
 416                 BIO_printf (bio_err, "-decrypt       decrypt encrypted message\n");
 417                 BIO_printf (bio_err, "-sign          sign message\n");
 418                 BIO_printf (bio_err, "-verify        verify signed message\n");
 419                 BIO_printf (bio_err, "-pk7out        output PKCS#7 structure\n");
 420 #ifndef OPENSSL_NO_DES
 421                 BIO_printf (bio_err, "-des3          encrypt with triple DES\n");
 422                 BIO_printf (bio_err, "-des           encrypt with DES\n");
 423 #endif
 424 #ifndef OPENSSL_NO_RC2
 425                 BIO_printf (bio_err, "-rc2-40        encrypt with RC2-40 (default)\n");
 426                 BIO_printf (bio_err, "-rc2-64        encrypt with RC2-64\n");
 427                 BIO_printf (bio_err, "-rc2-128       encrypt with RC2-128\n");
 428 #endif
 429 #ifndef OPENSSL_NO_AES
 430                 BIO_printf (bio_err, "-aes128, -aes192, -aes256\n");
 431                 BIO_printf (bio_err, "               encrypt PEM output with cbc aes\n");
 432 #endif
 433                 BIO_printf (bio_err, "-nointern      don't search certificates in message for signer\n");
 434                 BIO_printf (bio_err, "-nosigs        don't verify message signature\n");
 435                 BIO_printf (bio_err, "-noverify      don't verify signers certificate\n");
 436                 BIO_printf (bio_err, "-nocerts       don't include signers certificate when signing\n");
 437                 BIO_printf (bio_err, "-nodetach      use opaque signing\n");
 438                 BIO_printf (bio_err, "-noattr        don't include any signed attributes\n");
 439                 BIO_printf (bio_err, "-binary        don't translate message to text\n");
 440                 BIO_printf (bio_err, "-certfile file other certificates file\n");
 441                 BIO_printf (bio_err, "-signer file   signer certificate file\n");
 442                 BIO_printf (bio_err, "-recip  file   recipient certificate file for decryption\n");
 443                 BIO_printf (bio_err, "-in file       input file\n");
 444                 BIO_printf (bio_err, "-inform arg    input format SMIME (default), PEM or DER\n");
 445                 BIO_printf (bio_err, "-inkey file    input private key (if not signer or recipient)\n");
 446                 BIO_printf (bio_err, "-keyform arg   input private key format (PEM or ENGINE)\n");
 447                 BIO_printf (bio_err, "-out file      output file\n");
 448                 BIO_printf (bio_err, "-outform arg   output format SMIME (default), PEM or DER\n");
 449                 BIO_printf (bio_err, "-content file  supply or override content for detached signature\n");
 450                 BIO_printf (bio_err, "-to addr       to address\n");
 451                 BIO_printf (bio_err, "-from ad       from address\n");
 452                 BIO_printf (bio_err, "-subject s     subject\n");
 453                 BIO_printf (bio_err, "-text          include or delete text MIME headers\n");
 454                 BIO_printf (bio_err, "-CApath dir    trusted certificates directory\n");
 455                 BIO_printf (bio_err, "-CAfile file   trusted certificates file\n");
 456                 BIO_printf (bio_err, "-crl_check     check revocation status of signer's certificate using CRLs\n");
 457                 BIO_printf (bio_err, "-crl_check_all check revocation status of signer's certificate chain using CRLs\n");
 458 #ifndef OPENSSL_NO_ENGINE
 459                 BIO_printf (bio_err, "-engine e      use engine e, possibly a hardware device.\n");
 460 #endif
 461                 BIO_printf (bio_err, "-passin arg    input file pass phrase source\n");
 462                 BIO_printf(bio_err,  "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
 463                 BIO_printf(bio_err,  "               load the file (or the files in the directory) into\n");
 464                 BIO_printf(bio_err,  "               the random number generator\n");
 465                 BIO_printf (bio_err, "cert.pem       recipient certificate(s) for encryption\n");
 466                 goto end;
 467                 }
 468
 469 #ifndef OPENSSL_NO_ENGINE
 470         e = setup_engine(bio_err, engine, 0);
 471 #endif
 472
 473         if (!app_passwd(bio_err, passargin, NULL, &passin, NULL))
 474                 {
 475                 BIO_printf(bio_err, "Error getting password\n");
 476                 goto end;
 477                 }
 478
 479         if (need_rand)
 480                 {
 481                 app_RAND_load_file(NULL, bio_err, (inrand != NULL));
 482                 if (inrand != NULL)
 483                         BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
 484                                 app_RAND_load_files(inrand));
 485                 }
 486
 487         ret = 2;
 488
 489         if (!(operation & SMIME_SIGNERS))
 490                 flags &= ~PKCS7_DETACHED;
 491
 492         if (operation & SMIME_OP)
 493                 {
 494                 if (outformat == FORMAT_ASN1)
 495                         outmode = "wb";
 496                 }
 497         else
 498                 {
 499                 if (flags & PKCS7_BINARY)
 500                         outmode = "wb";
 501                 }
 502
 503         if (operation & SMIME_IP)
 504                 {
 505                 if (informat == FORMAT_ASN1)
 506                         inmode = "rb";
 507                 }
 508         else
 509                 {
 510                 if (flags & PKCS7_BINARY)
 511                         inmode = "rb";
 512                 }
 513
 514         if (operation == SMIME_ENCRYPT)
 515                 {
 516                 if (!cipher)
 517                         {
 518 #ifndef OPENSSL_NO_RC2
 519                         cipher = EVP_rc2_40_cbc();
 520 #else
 521                         BIO_printf(bio_err, "No cipher selected\n");
 522                         goto end;
 523 #endif
 524                         }
 525                 encerts = sk_X509_new_null();
 526                 while (*args)
 527                         {
 528                         if (!(cert = load_cert(bio_err,*args,FORMAT_PEM,
 529                                 NULL, e, "recipient certificate file")))
 530                                 {
 531 #if 0                           /* An appropriate message is already printed */
 532                                 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", *args);
 533 #endif
 534                                 goto end;
 535                                 }
 536                         sk_X509_push(encerts, cert);
 537                         cert = NULL;
 538                         args++;
 539                         }
 540                 }
 541
 542         if (certfile)
 543                 {
 544                 if (!(other = load_certs(bio_err,certfile,FORMAT_PEM, NULL,
 545                         e, "certificate file")))
 546                         {
 547                         ERR_print_errors(bio_err);
 548                         goto end;
 549                         }
 550                 }
 551
 552         if (recipfile && (operation == SMIME_DECRYPT))
 553                 {
 554                 if (!(recip = load_cert(bio_err,recipfile,FORMAT_PEM,NULL,
 555                         e, "recipient certificate file")))
 556                         {
 557                         ERR_print_errors(bio_err);
 558                         goto end;
 559                         }
 560                 }
 561
 562         if (operation == SMIME_DECRYPT)
 563                 {
 564                 if (!keyfile)
 565                         keyfile = recipfile;
 566                 }
 567         else if (operation == SMIME_SIGN)
 568                 {
 569                 if (!keyfile)
 570                         keyfile = signerfile;
 571                 }
 572         else keyfile = NULL;
 573
 574         if (keyfile)
 575                 {
 576                 key = load_key(bio_err, keyfile, keyform, 0, passin, e,
 577                                "signing key file");
 578                 if (!key)
 579                         goto end;
 580                 }
 581
 582         if (infile)
 583                 {
 584                 if (!(in = BIO_new_file(infile, inmode)))
 585                         {
 586                         BIO_printf (bio_err,
 587                                  "Can't open input file %s\n", infile);
 588                         goto end;
 589                         }
 590                 }
 591         else
 592                 in = BIO_new_fp(stdin, BIO_NOCLOSE);
 593
 594         if (operation & SMIME_IP)
 595                 {
 596                 if (informat == FORMAT_SMIME)
 597                         p7 = SMIME_read_PKCS7(in, &indata);
 598                 else if (informat == FORMAT_PEM)
 599                         p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
 600                 else if (informat == FORMAT_ASN1)
 601                         p7 = d2i_PKCS7_bio(in, NULL);
 602                 else
 603                         {
 604                         BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
 605                         goto end;
 606                         }
 607
 608                 if (!p7)
 609                         {
 610                         BIO_printf(bio_err, "Error reading S/MIME message\n");
 611                         goto end;
 612                         }
 613                 if (contfile)
 614                         {
 615                         BIO_free(indata);
 616                         if (!(indata = BIO_new_file(contfile, "rb")))
 617                                 {
 618                                 BIO_printf(bio_err, "Can't read content file %s\n", contfile);
 619                                 goto end;
 620                                 }
 621                         }
 622                 }
 623
 624         if (outfile)
 625                 {
 626                 if (!(out = BIO_new_file(outfile, outmode)))
 627                         {
 628                         BIO_printf (bio_err,
 629                                  "Can't open output file %s\n", outfile);
 630                         goto end;
 631                         }
 632                 }
 633         else
 634                 {
 635                 out = BIO_new_fp(stdout, BIO_NOCLOSE);
 636 #ifdef OPENSSL_SYS_VMS
 637                 {
 638                     BIO *tmpbio = BIO_new(BIO_f_linebuffer());
 639                     out = BIO_push(tmpbio, out);
 640                 }
 641 #endif
 642                 }
 643
 644         if (operation == SMIME_VERIFY)
 645                 {
 646                 if (!(store = setup_verify(bio_err, CAfile, CApath)))
 647                         goto end;
 648                 X509_STORE_set_verify_cb_func(store, smime_cb);
 649                 if (vpm)
 650                         X509_STORE_set1_param(store, vpm);
 651                 }
 652
 653
 654         ret = 3;
 655
 656         if (operation == SMIME_ENCRYPT)
 657                 p7 = PKCS7_encrypt(encerts, in, cipher, flags);
 658         else if (operation & SMIME_SIGNERS)
 659                 {
 660                 int i;
 661                 /* If detached data and SMIME output enable partial
 662                  * signing.
 663                  */
 664                 if (operation == SMIME_SIGN)
 665                         {
 666                         if ((flags & PKCS7_DETACHED)
 667                                 && (outformat == FORMAT_SMIME))
 668                                 flags |= PKCS7_STREAM;
 669                         flags |= PKCS7_PARTIAL;
 670                         p7 = PKCS7_sign(NULL, NULL, other, in, flags);
 671                         }
 672                 else
 673                         flags |= PKCS7_REUSE_DIGEST;
 674                 for (i = 0; i < sk_num(sksigners); i++)
 675                         {
 676                         signerfile = sk_value(sksigners, i);
 677                         keyfile = sk_value(skkeys, i);
 678                         signer = load_cert(bio_err, signerfile,FORMAT_PEM, NULL,
 679                                         e, "signer certificate");
 680                         if (!signer)
 681                                 goto end;
 682                         key = load_key(bio_err, keyfile, keyform, 0, passin, e,
 683                                "signing key file");
 684                         if (!key)
 685                                 goto end;
 686                         if (!PKCS7_sign_add_signer(p7, signer, key,
 687                                                 sign_md, flags))
 688                                 goto end;
 689                         X509_free(signer);
 690                         signer = NULL;
 691                         EVP_PKEY_free(key);
 692                         key = NULL;
 693                         }
 694                 /* If not streaming or resigning finalize structure */
 695                 if ((operation == SMIME_SIGN) && !(flags & PKCS7_STREAM))
 696                         {
 697                         if (!PKCS7_final(p7, in, flags))
 698                                 goto end;
 699                         if (BIO_reset(in) != 0)
 700                                 {
 701                                 BIO_puts(bio_err, "Can't rewind input file\n");
 702                                 goto end;
 703                                 }
 704                         }
 705                 }
 706
 707         if (!p7)
 708                 {
 709                 BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
 710                 goto end;
 711                 }
 712
 713         ret = 4;
 714         if (operation == SMIME_DECRYPT)
 715                 {
 716                 if (!PKCS7_decrypt(p7, key, recip, out, flags))
 717                         {
 718                         BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
 719                         goto end;
 720                         }
 721                 }
 722         else if (operation == SMIME_VERIFY)
 723                 {
 724                 STACK_OF(X509) *signers;
 725                 if (PKCS7_verify(p7, other, store, indata, out, flags))
 726                         BIO_printf(bio_err, "Verification successful\n");
 727                 else
 728                         {
 729                         BIO_printf(bio_err, "Verification failure\n");
 730                         goto end;
 731                         }
 732                 signers = PKCS7_get0_signers(p7, other, flags);
 733                 if (!save_certs(signerfile, signers))
 734                         {
 735                         BIO_printf(bio_err, "Error writing signers to %s\n",
 736                                                                 signerfile);
 737                         ret = 5;
 738                         goto end;
 739                         }
 740                 sk_X509_free(signers);
 741                 }
 742         else if (operation == SMIME_PK7OUT)
 743                 PEM_write_bio_PKCS7(out, p7);
 744         else
 745                 {
 746                 if (to)
 747                         BIO_printf(out, "To: %s\n", to);
 748                 if (from)
 749                         BIO_printf(out, "From: %s\n", from);
 750                 if (subject)
 751                         BIO_printf(out, "Subject: %s\n", subject);
 752                 if (outformat == FORMAT_SMIME)
 753                         {
 754                         if (operation == SMIME_RESIGN)
 755                                 SMIME_write_PKCS7(out, p7, indata, flags);
 756                         else
 757                                 SMIME_write_PKCS7(out, p7, in, flags);
 758                         }
 759                 else if (outformat == FORMAT_PEM)
 760                         PEM_write_bio_PKCS7(out,p7);
 761                 else if (outformat == FORMAT_ASN1)
 762                         i2d_PKCS7_bio(out,p7);
 763                 else
 764                         {
 765                         BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
 766                         goto end;
 767                         }
 768                 }
 769         ret = 0;
 770 end:
 771         if (need_rand)
 772                 app_RAND_write_file(NULL, bio_err);
 773         if (ret) ERR_print_errors(bio_err);
 774         sk_X509_pop_free(encerts, X509_free);
 775         sk_X509_pop_free(other, X509_free);
 776         if (vpm)
 777                 X509_VERIFY_PARAM_free(vpm);
 778         if (sksigners)
 779                 sk_free(sksigners);
 780         if (skkeys)
 781                 sk_free(skkeys);
 782         X509_STORE_free(store);
 783         X509_free(cert);
 784         X509_free(recip);
 785         X509_free(signer);
 786         EVP_PKEY_free(key);
 787         PKCS7_free(p7);
 788         BIO_free(in);
 789         BIO_free(indata);
 790         BIO_free_all(out);
 791         if (passin) OPENSSL_free(passin);
 792         return (ret);
 793 }
 794
 795 static int save_certs(char *signerfile, STACK_OF(X509) *signers)
 796         {
 797         int i;
 798         BIO *tmp;
 799         if (!signerfile)
 800                 return 1;
 801         tmp = BIO_new_file(signerfile, "w");
 802         if (!tmp) return 0;
 803         for(i = 0; i < sk_X509_num(signers); i++)
 804                 PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
 805         BIO_free(tmp);
 806         return 1;
 807         }
 808
 809
 810 /* Minimal callback just to output policy info (if any) */
 811
 812 static int smime_cb(int ok, X509_STORE_CTX *ctx)
 813         {
 814         int error;
 815
 816         error = X509_STORE_CTX_get_error(ctx);
 817
 818         if ((error != X509_V_ERR_NO_EXPLICIT_POLICY)
 819                 && ((error != X509_V_OK) || (ok != 2)))
 820                 return ok;
 821
 822         policies_print(NULL, ctx);
 823
 824         return ok;
 825
 826         }