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