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