crypto/external/bsd/openssl/dist/apps/smime.c

   1 /* smime.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   4  * project.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2004 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 /* S/MIME utility function */
  61
  62 #include <stdio.h>
  63 #include <string.h>
  64 #include "apps.h"
  65 #include <openssl/crypto.h>
  66 #include <openssl/pem.h>
  67 #include <openssl/err.h>
  68 #include <openssl/x509_vfy.h>
  69 #include <openssl/x509v3.h>
  70
  71 #undef PROG
  72 #define PROG smime_main
  73 static int save_certs(char *signerfile, STACK_OF(X509) *signers);
  74 static int smime_cb(int ok, X509_STORE_CTX *ctx);
  75
  76 #define SMIME_OP        0x10
  77 #define SMIME_IP        0x20
  78 #define SMIME_SIGNERS   0x40
  79 #define SMIME_ENCRYPT   (1 | SMIME_OP)
  80 #define SMIME_DECRYPT   (2 | SMIME_IP)
  81 #define SMIME_SIGN      (3 | SMIME_OP | SMIME_SIGNERS)
  82 #define SMIME_VERIFY    (4 | SMIME_IP)
  83 #define SMIME_PK7OUT    (5 | SMIME_IP | SMIME_OP)
  84 #define SMIME_RESIGN    (6 | SMIME_IP | SMIME_OP | SMIME_SIGNERS)
  85
  86 int MAIN(int, char **);
  87
  88 int MAIN(int argc, char **argv)
  89 {
  90     ENGINE *e = NULL;
  91     int operation = 0;
  92     int ret = 0;
  93     char **args;
  94     const char *inmode = "r", *outmode = "w";
  95     char *infile = NULL, *outfile = NULL;
  96     char *signerfile = NULL, *recipfile = NULL;
  97     STACK_OF(OPENSSL_STRING) *sksigners = NULL, *skkeys = NULL;
  98     char *certfile = NULL, *keyfile = NULL, *contfile = NULL;
  99     const EVP_CIPHER *cipher = NULL;
 100     PKCS7 *p7 = NULL;
 101     X509_STORE *store = NULL;
 102     X509 *cert = NULL, *recip = NULL, *signer = NULL;
 103     EVP_PKEY *key = NULL;
 104     STACK_OF(X509) *encerts = NULL, *other = NULL;
 105     BIO *in = NULL, *out = NULL, *indata = NULL;
 106     int badarg = 0;
 107     int flags = PKCS7_DETACHED;
 108     char *to = NULL, *from = NULL, *subject = NULL;
 109     char *CAfile = NULL, *CApath = NULL;
 110     char *passargin = NULL, *passin = NULL;
 111     char *inrand = NULL;
 112     int need_rand = 0;
 113     int indef = 0;
 114     const EVP_MD *sign_md = NULL;
 115     int informat = FORMAT_SMIME, outformat = FORMAT_SMIME;
 116     int keyform = FORMAT_PEM;
 117 #ifndef OPENSSL_NO_ENGINE
 118     char *engine = NULL;
 119 #endif
 120
 121     X509_VERIFY_PARAM *vpm = NULL;
 122
 123     args = argv + 1;
 124     ret = 1;
 125
 126     apps_startup();
 127
 128     if (bio_err == NULL) {
 129         if ((bio_err = BIO_new(BIO_s_file())) != NULL)
 130             BIO_set_fp(bio_err, stderr, BIO_NOCLOSE | BIO_FP_TEXT);
 131     }
 132
 133     if (!load_config(bio_err, NULL))
 134         goto end;
 135
 136     while (!badarg && *args && *args[0] == '-') {
 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_SEED
 156         else if (!strcmp(*args, "-seed"))
 157             cipher = EVP_seed_cbc();
 158 #endif
 159 #ifndef OPENSSL_NO_RC2
 160         else if (!strcmp(*args, "-rc2-40"))
 161             cipher = EVP_rc2_40_cbc();
 162         else if (!strcmp(*args, "-rc2-128"))
 163             cipher = EVP_rc2_cbc();
 164         else if (!strcmp(*args, "-rc2-64"))
 165             cipher = EVP_rc2_64_cbc();
 166 #endif
 167 #ifndef OPENSSL_NO_AES
 168         else if (!strcmp(*args, "-aes128"))
 169             cipher = EVP_aes_128_cbc();
 170         else if (!strcmp(*args, "-aes192"))
 171             cipher = EVP_aes_192_cbc();
 172         else if (!strcmp(*args, "-aes256"))
 173             cipher = EVP_aes_256_cbc();
 174 #endif
 175 #ifndef OPENSSL_NO_CAMELLIA
 176         else if (!strcmp(*args, "-camellia128"))
 177             cipher = EVP_camellia_128_cbc();
 178         else if (!strcmp(*args, "-camellia192"))
 179             cipher = EVP_camellia_192_cbc();
 180         else if (!strcmp(*args, "-camellia256"))
 181             cipher = EVP_camellia_256_cbc();
 182 #endif
 183         else if (!strcmp(*args, "-text"))
 184             flags |= PKCS7_TEXT;
 185         else if (!strcmp(*args, "-nointern"))
 186             flags |= PKCS7_NOINTERN;
 187         else if (!strcmp(*args, "-noverify"))
 188             flags |= PKCS7_NOVERIFY;
 189         else if (!strcmp(*args, "-nochain"))
 190             flags |= PKCS7_NOCHAIN;
 191         else if (!strcmp(*args, "-nocerts"))
 192             flags |= PKCS7_NOCERTS;
 193         else if (!strcmp(*args, "-noattr"))
 194             flags |= PKCS7_NOATTR;
 195         else if (!strcmp(*args, "-nodetach"))
 196             flags &= ~PKCS7_DETACHED;
 197         else if (!strcmp(*args, "-nosmimecap"))
 198             flags |= PKCS7_NOSMIMECAP;
 199         else if (!strcmp(*args, "-binary"))
 200             flags |= PKCS7_BINARY;
 201         else if (!strcmp(*args, "-nosigs"))
 202             flags |= PKCS7_NOSIGS;
 203         else if (!strcmp(*args, "-stream"))
 204             indef = 1;
 205         else if (!strcmp(*args, "-indef"))
 206             indef = 1;
 207         else if (!strcmp(*args, "-noindef"))
 208             indef = 0;
 209         else if (!strcmp(*args, "-nooldmime"))
 210             flags |= PKCS7_NOOLDMIMETYPE;
 211         else if (!strcmp(*args, "-crlfeol"))
 212             flags |= PKCS7_CRLFEOL;
 213         else if (!strcmp(*args, "-rand")) {
 214             if (!args[1])
 215                 goto argerr;
 216             args++;
 217             inrand = *args;
 218             need_rand = 1;
 219         }
 220 #ifndef OPENSSL_NO_ENGINE
 221         else if (!strcmp(*args, "-engine")) {
 222             if (!args[1])
 223                 goto argerr;
 224             engine = *++args;
 225         }
 226 #endif
 227         else if (!strcmp(*args, "-passin")) {
 228             if (!args[1])
 229                 goto argerr;
 230             passargin = *++args;
 231         } else if (!strcmp(*args, "-to")) {
 232             if (!args[1])
 233                 goto argerr;
 234             to = *++args;
 235         } else if (!strcmp(*args, "-from")) {
 236             if (!args[1])
 237                 goto argerr;
 238             from = *++args;
 239         } else if (!strcmp(*args, "-subject")) {
 240             if (!args[1])
 241                 goto argerr;
 242             subject = *++args;
 243         } else if (!strcmp(*args, "-signer")) {
 244             if (!args[1])
 245                 goto argerr;
 246             /* If previous -signer argument add signer to list */
 247
 248             if (signerfile) {
 249                 if (!sksigners)
 250                     sksigners = sk_OPENSSL_STRING_new_null();
 251                 sk_OPENSSL_STRING_push(sksigners, signerfile);
 252                 if (!keyfile)
 253                     keyfile = signerfile;
 254                 if (!skkeys)
 255                     skkeys = sk_OPENSSL_STRING_new_null();
 256                 sk_OPENSSL_STRING_push(skkeys, keyfile);
 257                 keyfile = NULL;
 258             }
 259             signerfile = *++args;
 260         } else if (!strcmp(*args, "-recip")) {
 261             if (!args[1])
 262                 goto argerr;
 263             recipfile = *++args;
 264         } else if (!strcmp(*args, "-md")) {
 265             if (!args[1])
 266                 goto argerr;
 267             sign_md = EVP_get_digestbyname(*++args);
 268             if (sign_md == NULL) {
 269                 BIO_printf(bio_err, "Unknown digest %s\n", *args);
 270                 goto argerr;
 271             }
 272         } else if (!strcmp(*args, "-inkey")) {
 273             if (!args[1])
 274                 goto argerr;
 275             /* If previous -inkey arument add signer to list */
 276             if (keyfile) {
 277                 if (!signerfile) {
 278                     BIO_puts(bio_err, "Illegal -inkey without -signer\n");
 279                     goto argerr;
 280                 }
 281                 if (!sksigners)
 282                     sksigners = sk_OPENSSL_STRING_new_null();
 283                 sk_OPENSSL_STRING_push(sksigners, signerfile);
 284                 signerfile = NULL;
 285                 if (!skkeys)
 286                     skkeys = sk_OPENSSL_STRING_new_null();
 287                 sk_OPENSSL_STRING_push(skkeys, keyfile);
 288             }
 289             keyfile = *++args;
 290         } else if (!strcmp(*args, "-keyform")) {
 291             if (!args[1])
 292                 goto argerr;
 293             keyform = str2fmt(*++args);
 294         } else if (!strcmp(*args, "-certfile")) {
 295             if (!args[1])
 296                 goto argerr;
 297             certfile = *++args;
 298         } else if (!strcmp(*args, "-CAfile")) {
 299             if (!args[1])
 300                 goto argerr;
 301             CAfile = *++args;
 302         } else if (!strcmp(*args, "-CApath")) {
 303             if (!args[1])
 304                 goto argerr;
 305             CApath = *++args;
 306         } else if (!strcmp(*args, "-in")) {
 307             if (!args[1])
 308                 goto argerr;
 309             infile = *++args;
 310         } else if (!strcmp(*args, "-inform")) {
 311             if (!args[1])
 312                 goto argerr;
 313             informat = str2fmt(*++args);
 314         } else if (!strcmp(*args, "-outform")) {
 315             if (!args[1])
 316                 goto argerr;
 317             outformat = str2fmt(*++args);
 318         } else if (!strcmp(*args, "-out")) {
 319             if (!args[1])
 320                 goto argerr;
 321             outfile = *++args;
 322         } else if (!strcmp(*args, "-content")) {
 323             if (!args[1])
 324                 goto argerr;
 325             contfile = *++args;
 326         } else if (args_verify(&args, NULL, &badarg, bio_err, &vpm))
 327             continue;
 328         else if ((cipher = EVP_get_cipherbyname(*args + 1)) == NULL)
 329             badarg = 1;
 330         args++;
 331     }
 332
 333     if (!(operation & SMIME_SIGNERS) && (skkeys || sksigners)) {
 334         BIO_puts(bio_err, "Multiple signers or keys not allowed\n");
 335         goto argerr;
 336     }
 337
 338     if (operation & SMIME_SIGNERS) {
 339         /* Check to see if any final signer needs to be appended */
 340         if (keyfile && !signerfile) {
 341             BIO_puts(bio_err, "Illegal -inkey without -signer\n");
 342             goto argerr;
 343         }
 344         if (signerfile) {
 345             if (!sksigners)
 346                 sksigners = sk_OPENSSL_STRING_new_null();
 347             sk_OPENSSL_STRING_push(sksigners, signerfile);
 348             if (!skkeys)
 349                 skkeys = sk_OPENSSL_STRING_new_null();
 350             if (!keyfile)
 351                 keyfile = signerfile;
 352             sk_OPENSSL_STRING_push(skkeys, keyfile);
 353         }
 354         if (!sksigners) {
 355             BIO_printf(bio_err, "No signer certificate specified\n");
 356             badarg = 1;
 357         }
 358         signerfile = NULL;
 359         keyfile = NULL;
 360         need_rand = 1;
 361     } else if (operation == SMIME_DECRYPT) {
 362         if (!recipfile && !keyfile) {
 363             BIO_printf(bio_err,
 364                        "No recipient certificate or key specified\n");
 365             badarg = 1;
 366         }
 367     } else if (operation == SMIME_ENCRYPT) {
 368         if (!*args) {
 369             BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
 370             badarg = 1;
 371         }
 372         need_rand = 1;
 373     } else if (!operation)
 374         badarg = 1;
 375
 376     if (badarg) {
 377  argerr:
 378         BIO_printf(bio_err, "Usage smime [options] cert.pem ...\n");
 379         BIO_printf(bio_err, "where options are\n");
 380         BIO_printf(bio_err, "-encrypt       encrypt message\n");
 381         BIO_printf(bio_err, "-decrypt       decrypt encrypted message\n");
 382         BIO_printf(bio_err, "-sign          sign message\n");
 383         BIO_printf(bio_err, "-verify        verify signed message\n");
 384         BIO_printf(bio_err, "-pk7out        output PKCS#7 structure\n");
 385 #ifndef OPENSSL_NO_DES
 386         BIO_printf(bio_err, "-des3          encrypt with triple DES\n");
 387         BIO_printf(bio_err, "-des           encrypt with DES\n");
 388 #endif
 389 #ifndef OPENSSL_NO_SEED
 390         BIO_printf(bio_err, "-seed          encrypt with SEED\n");
 391 #endif
 392 #ifndef OPENSSL_NO_RC2
 393         BIO_printf(bio_err, "-rc2-40        encrypt with RC2-40 (default)\n");
 394         BIO_printf(bio_err, "-rc2-64        encrypt with RC2-64\n");
 395         BIO_printf(bio_err, "-rc2-128       encrypt with RC2-128\n");
 396 #endif
 397 #ifndef OPENSSL_NO_AES
 398         BIO_printf(bio_err, "-aes128, -aes192, -aes256\n");
 399         BIO_printf(bio_err,
 400                    "               encrypt PEM output with cbc aes\n");
 401 #endif
 402 #ifndef OPENSSL_NO_CAMELLIA
 403         BIO_printf(bio_err, "-camellia128, -camellia192, -camellia256\n");
 404         BIO_printf(bio_err,
 405                    "               encrypt PEM output with cbc camellia\n");
 406 #endif
 407         BIO_printf(bio_err,
 408                    "-nointern      don't search certificates in message for signer\n");
 409         BIO_printf(bio_err,
 410                    "-nosigs        don't verify message signature\n");
 411         BIO_printf(bio_err,
 412                    "-noverify      don't verify signers certificate\n");
 413         BIO_printf(bio_err,
 414                    "-nocerts       don't include signers certificate when signing\n");
 415         BIO_printf(bio_err, "-nodetach      use opaque signing\n");
 416         BIO_printf(bio_err,
 417                    "-noattr        don't include any signed attributes\n");
 418         BIO_printf(bio_err,
 419                    "-binary        don't translate message to text\n");
 420         BIO_printf(bio_err, "-certfile file other certificates file\n");
 421         BIO_printf(bio_err, "-signer file   signer certificate file\n");
 422         BIO_printf(bio_err,
 423                    "-recip  file   recipient certificate file for decryption\n");
 424         BIO_printf(bio_err, "-in file       input file\n");
 425         BIO_printf(bio_err,
 426                    "-inform arg    input format SMIME (default), PEM or DER\n");
 427         BIO_printf(bio_err,
 428                    "-inkey file    input private key (if not signer or recipient)\n");
 429         BIO_printf(bio_err,
 430                    "-keyform arg   input private key format (PEM or ENGINE)\n");
 431         BIO_printf(bio_err, "-out file      output file\n");
 432         BIO_printf(bio_err,
 433                    "-outform arg   output format SMIME (default), PEM or DER\n");
 434         BIO_printf(bio_err,
 435                    "-content file  supply or override content for detached signature\n");
 436         BIO_printf(bio_err, "-to addr       to address\n");
 437         BIO_printf(bio_err, "-from ad       from address\n");
 438         BIO_printf(bio_err, "-subject s     subject\n");
 439         BIO_printf(bio_err,
 440                    "-text          include or delete text MIME headers\n");
 441         BIO_printf(bio_err,
 442                    "-CApath dir    trusted certificates directory\n");
 443         BIO_printf(bio_err, "-CAfile file   trusted certificates file\n");
 444         BIO_printf(bio_err,
 445                    "-no_alt_chains only ever use the first certificate chain found\n");
 446         BIO_printf(bio_err,
 447                    "-crl_check     check revocation status of signer's certificate using CRLs\n");
 448         BIO_printf(bio_err,
 449                    "-crl_check_all check revocation status of signer's certificate chain using CRLs\n");
 450 #ifndef OPENSSL_NO_ENGINE
 451         BIO_printf(bio_err,
 452                    "-engine e      use engine e, possibly a hardware device.\n");
 453 #endif
 454         BIO_printf(bio_err, "-passin arg    input file pass phrase source\n");
 455         BIO_printf(bio_err, "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR,
 456                    LIST_SEPARATOR_CHAR);
 457         BIO_printf(bio_err,
 458                    "               load the file (or the files in the directory) into\n");
 459         BIO_printf(bio_err, "               the random number generator\n");
 460         BIO_printf(bio_err,
 461                    "cert.pem       recipient certificate(s) for encryption\n");
 462         goto end;
 463     }
 464 #ifndef OPENSSL_NO_ENGINE
 465     e = setup_engine(bio_err, engine, 0);
 466 #endif
 467
 468     if (!app_passwd(bio_err, passargin, NULL, &passin, NULL)) {
 469         BIO_printf(bio_err, "Error getting password\n");
 470         goto end;
 471     }
 472
 473     if (need_rand) {
 474         app_RAND_load_file(NULL, bio_err, (inrand != NULL));
 475         if (inrand != NULL)
 476             BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
 477                        app_RAND_load_files(inrand));
 478     }
 479
 480     ret = 2;
 481
 482     if (!(operation & SMIME_SIGNERS))
 483         flags &= ~PKCS7_DETACHED;
 484
 485     if (operation & SMIME_OP) {
 486         if (outformat == FORMAT_ASN1)
 487             outmode = "wb";
 488     } else {
 489         if (flags & PKCS7_BINARY)
 490             outmode = "wb";
 491     }
 492
 493     if (operation & SMIME_IP) {
 494         if (informat == FORMAT_ASN1)
 495             inmode = "rb";
 496     } else {
 497         if (flags & PKCS7_BINARY)
 498             inmode = "rb";
 499     }
 500
 501     if (operation == SMIME_ENCRYPT) {
 502         if (!cipher) {
 503 #ifndef OPENSSL_NO_DES
 504             cipher = EVP_des_ede3_cbc();
 505 #else
 506             BIO_printf(bio_err, "No cipher selected\n");
 507             goto end;
 508 #endif
 509         }
 510         encerts = sk_X509_new_null();
 511         while (*args) {
 512             if (!(cert = load_cert(bio_err, *args, FORMAT_PEM,
 513                                    NULL, e, "recipient certificate file"))) {
 514 #if 0                           /* An appropriate message is already printed */
 515                 BIO_printf(bio_err,
 516                            "Can't read recipient certificate file %s\n",
 517                            *args);
 518 #endif
 519                 goto end;
 520             }
 521             sk_X509_push(encerts, cert);
 522             cert = NULL;
 523             args++;
 524         }
 525     }
 526
 527     if (certfile) {
 528         if (!(other = load_certs(bio_err, certfile, FORMAT_PEM, NULL,
 529                                  e, "certificate file"))) {
 530             ERR_print_errors(bio_err);
 531             goto end;
 532         }
 533     }
 534
 535     if (recipfile && (operation == SMIME_DECRYPT)) {
 536         if (!(recip = load_cert(bio_err, recipfile, FORMAT_PEM, NULL,
 537                                 e, "recipient certificate file"))) {
 538             ERR_print_errors(bio_err);
 539             goto end;
 540         }
 541     }
 542
 543     if (operation == SMIME_DECRYPT) {
 544         if (!keyfile)
 545             keyfile = recipfile;
 546     } else if (operation == SMIME_SIGN) {
 547         if (!keyfile)
 548             keyfile = signerfile;
 549     } else
 550         keyfile = NULL;
 551
 552     if (keyfile) {
 553         key = load_key(bio_err, keyfile, keyform, 0, passin, e,
 554                        "signing key file");
 555         if (!key)
 556             goto end;
 557     }
 558
 559     if (infile) {
 560         if (!(in = BIO_new_file(infile, inmode))) {
 561             BIO_printf(bio_err, "Can't open input file %s\n", infile);
 562             goto end;
 563         }
 564     } else
 565         in = BIO_new_fp(stdin, BIO_NOCLOSE);
 566
 567     if (operation & SMIME_IP) {
 568         if (informat == FORMAT_SMIME)
 569             p7 = SMIME_read_PKCS7(in, &indata);
 570         else if (informat == FORMAT_PEM)
 571             p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
 572         else if (informat == FORMAT_ASN1)
 573             p7 = d2i_PKCS7_bio(in, NULL);
 574         else {
 575             BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
 576             goto end;
 577         }
 578
 579         if (!p7) {
 580             BIO_printf(bio_err, "Error reading S/MIME message\n");
 581             goto end;
 582         }
 583         if (contfile) {
 584             BIO_free(indata);
 585             if (!(indata = BIO_new_file(contfile, "rb"))) {
 586                 BIO_printf(bio_err, "Can't read content file %s\n", contfile);
 587                 goto end;
 588             }
 589         }
 590     }
 591
 592     if (outfile) {
 593         if (!(out = BIO_new_file(outfile, outmode))) {
 594             BIO_printf(bio_err, "Can't open output file %s\n", outfile);
 595             goto end;
 596         }
 597     } else {
 598         out = BIO_new_fp(stdout, BIO_NOCLOSE);
 599 #ifdef OPENSSL_SYS_VMS
 600         {
 601             BIO *tmpbio = BIO_new(BIO_f_linebuffer());
 602             out = BIO_push(tmpbio, out);
 603         }
 604 #endif
 605     }
 606
 607     if (operation == SMIME_VERIFY) {
 608         if (!(store = setup_verify(bio_err, CAfile, CApath)))
 609             goto end;
 610         X509_STORE_set_verify_cb(store, smime_cb);
 611         if (vpm)
 612             X509_STORE_set1_param(store, vpm);
 613     }
 614
 615     ret = 3;
 616
 617     if (operation == SMIME_ENCRYPT) {
 618         if (indef)
 619             flags |= PKCS7_STREAM;
 620         p7 = PKCS7_encrypt(encerts, in, cipher, flags);
 621     } else if (operation & SMIME_SIGNERS) {
 622         int i;
 623         /*
 624          * If detached data content we only enable streaming if S/MIME output
 625          * format.
 626          */
 627         if (operation == SMIME_SIGN) {
 628             if (flags & PKCS7_DETACHED) {
 629                 if (outformat == FORMAT_SMIME)
 630                     flags |= PKCS7_STREAM;
 631             } else if (indef)
 632                 flags |= PKCS7_STREAM;
 633             flags |= PKCS7_PARTIAL;
 634             p7 = PKCS7_sign(NULL, NULL, other, in, flags);
 635             if (!p7)
 636                 goto end;
 637         } else
 638             flags |= PKCS7_REUSE_DIGEST;
 639         for (i = 0; i < sk_OPENSSL_STRING_num(sksigners); i++) {
 640             signerfile = sk_OPENSSL_STRING_value(sksigners, i);
 641             keyfile = sk_OPENSSL_STRING_value(skkeys, i);
 642             signer = load_cert(bio_err, signerfile, FORMAT_PEM, NULL,
 643                                e, "signer certificate");
 644             if (!signer)
 645                 goto end;
 646             key = load_key(bio_err, keyfile, keyform, 0, passin, e,
 647                            "signing key file");
 648             if (!key)
 649                 goto end;
 650             if (!PKCS7_sign_add_signer(p7, signer, key, sign_md, flags))
 651                 goto end;
 652             X509_free(signer);
 653             signer = NULL;
 654             EVP_PKEY_free(key);
 655             key = NULL;
 656         }
 657         /* If not streaming or resigning finalize structure */
 658         if ((operation == SMIME_SIGN) && !(flags & PKCS7_STREAM)) {
 659             if (!PKCS7_final(p7, in, flags))
 660                 goto end;
 661         }
 662     }
 663
 664     if (!p7) {
 665         BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
 666         goto end;
 667     }
 668
 669     ret = 4;
 670     if (operation == SMIME_DECRYPT) {
 671         if (!PKCS7_decrypt(p7, key, recip, out, flags)) {
 672             BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
 673             goto end;
 674         }
 675     } else if (operation == SMIME_VERIFY) {
 676         STACK_OF(X509) *signers;
 677         if (PKCS7_verify(p7, other, store, indata, out, flags))
 678             BIO_printf(bio_err, "Verification successful\n");
 679         else {
 680             BIO_printf(bio_err, "Verification failure\n");
 681             goto end;
 682         }
 683         signers = PKCS7_get0_signers(p7, other, flags);
 684         if (!save_certs(signerfile, signers)) {
 685             BIO_printf(bio_err, "Error writing signers to %s\n", signerfile);
 686             ret = 5;
 687             goto end;
 688         }
 689         sk_X509_free(signers);
 690     } else if (operation == SMIME_PK7OUT)
 691         PEM_write_bio_PKCS7(out, p7);
 692     else {
 693         if (to)
 694             BIO_printf(out, "To: %s\n", to);
 695         if (from)
 696             BIO_printf(out, "From: %s\n", from);
 697         if (subject)
 698             BIO_printf(out, "Subject: %s\n", subject);
 699         if (outformat == FORMAT_SMIME) {
 700             if (operation == SMIME_RESIGN)
 701                 SMIME_write_PKCS7(out, p7, indata, flags);
 702             else
 703                 SMIME_write_PKCS7(out, p7, in, flags);
 704         } else if (outformat == FORMAT_PEM)
 705             PEM_write_bio_PKCS7_stream(out, p7, in, flags);
 706         else if (outformat == FORMAT_ASN1)
 707             i2d_PKCS7_bio_stream(out, p7, in, flags);
 708         else {
 709             BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
 710             goto end;
 711         }
 712     }
 713     ret = 0;
 714  end:
 715     if (need_rand)
 716         app_RAND_write_file(NULL, bio_err);
 717     if (ret)
 718         ERR_print_errors(bio_err);
 719     sk_X509_pop_free(encerts, X509_free);
 720     sk_X509_pop_free(other, X509_free);
 721     if (vpm)
 722         X509_VERIFY_PARAM_free(vpm);
 723     if (sksigners)
 724         sk_OPENSSL_STRING_free(sksigners);
 725     if (skkeys)
 726         sk_OPENSSL_STRING_free(skkeys);
 727     X509_STORE_free(store);
 728     X509_free(cert);
 729     X509_free(recip);
 730     X509_free(signer);
 731     EVP_PKEY_free(key);
 732     PKCS7_free(p7);
 733     BIO_free(in);
 734     BIO_free(indata);
 735     BIO_free_all(out);
 736     if (passin)
 737         OPENSSL_free(passin);
 738     return (ret);
 739 }
 740
 741 static int save_certs(char *signerfile, STACK_OF(X509) *signers)
 742 {
 743     int i;
 744     BIO *tmp;
 745     if (!signerfile)
 746         return 1;
 747     tmp = BIO_new_file(signerfile, "w");
 748     if (!tmp)
 749         return 0;
 750     for (i = 0; i < sk_X509_num(signers); i++)
 751         PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
 752     BIO_free(tmp);
 753     return 1;
 754 }
 755
 756 /* Minimal callback just to output policy info (if any) */
 757
 758 static int smime_cb(int ok, X509_STORE_CTX *ctx)
 759 {
 760     int error;
 761
 762     error = X509_STORE_CTX_get_error(ctx);
 763
 764     if ((error != X509_V_ERR_NO_EXPLICIT_POLICY)
 765         && ((error != X509_V_OK) || (ok != 2)))
 766         return ok;
 767
 768     policies_print(NULL, ctx);
 769
 770     return ok;
 771
 772 }