apps/smime.c

   1 /* smime.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1999-2004 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 /* S/MIME utility function */
  60
  61 #include <stdio.h>
  62 #include <string.h>
  63 #include "apps.h"
  64 #include <openssl/crypto.h>
  65 #include <openssl/pem.h>
  66 #include <openssl/err.h>
  67 #include <openssl/x509_vfy.h>
  68 #include <openssl/x509v3.h>
  69
  70 #undef PROG
  71 #define PROG smime_main
  72 static int save_certs(char *signerfile, STACK_OF(X509) *signers);
  73 static int smime_cb(int ok, X509_STORE_CTX *ctx);
  74
  75 #define SMIME_OP        0x10
  76 #define SMIME_IP        0x20
  77 #define SMIME_SIGNERS   0x40
  78 #define SMIME_ENCRYPT   (1 | SMIME_OP)
  79 #define SMIME_DECRYPT   (2 | SMIME_IP)
  80 #define SMIME_SIGN      (3 | SMIME_OP | SMIME_SIGNERS)
  81 #define SMIME_VERIFY    (4 | SMIME_IP)
  82 #define SMIME_PK7OUT    (5 | SMIME_IP | SMIME_OP)
  83 #define SMIME_RESIGN    (6 | SMIME_IP | SMIME_OP | SMIME_SIGNERS)
  84
  85 int MAIN(int, char **);
  86
  87 int MAIN(int argc, char **argv)
  88         {
  89         ENGINE *e = NULL;
  90         int operation = 0;
  91         int ret = 0;
  92         char **args;
  93         const char *inmode = "r", *outmode = "w";
  94         char *infile = NULL, *outfile = NULL;
  95         char *signerfile = NULL, *recipfile = NULL;
  96         STACK *sksigners = NULL, *skkeys = NULL;
  97         char *certfile = NULL, *keyfile = NULL, *contfile=NULL;
  98         const EVP_CIPHER *cipher = NULL;
  99         PKCS7 *p7 = NULL;
 100         X509_STORE *store = NULL;
 101         X509 *cert = NULL, *recip = NULL, *signer = NULL;
 102         EVP_PKEY *key = NULL;
 103         STACK_OF(X509) *encerts = NULL, *other = NULL;
 104         BIO *in = NULL, *out = NULL, *indata = NULL;
 105         int badarg = 0;
 106         int flags = PKCS7_DETACHED;
 107         char *to = NULL, *from = NULL, *subject = NULL;
 108         char *CAfile = NULL, *CApath = NULL;
 109         char *passargin = NULL, *passin = NULL;
 110         char *inrand = NULL;
 111         int need_rand = 0;
 112         const EVP_MD *sign_md = NULL;
 113         int informat = FORMAT_SMIME, outformat = FORMAT_SMIME;
 114         int keyform = FORMAT_PEM;
 115 #ifndef OPENSSL_NO_ENGINE
 116         char *engine=NULL;
 117 #endif
 118
 119         X509_VERIFY_PARAM *vpm = NULL;
 120
 121         args = argv + 1;
 122         ret = 1;
 123
 124         apps_startup();
 125
 126         if (bio_err == NULL)
 127                 {
 128                 if ((bio_err = BIO_new(BIO_s_file())) != NULL)
 129                         BIO_set_fp(bio_err, stderr, BIO_NOCLOSE|BIO_FP_TEXT);
 130                 }
 131
 132         if (!load_config(bio_err, NULL))
 133                 goto end;
 134
 135         while (!badarg && *args && *args[0] == '-')
 136                 {
 137                 if (!strcmp (*args, "-encrypt"))
 138                         operation = SMIME_ENCRYPT;
 139                 else if (!strcmp (*args, "-decrypt"))
 140                         operation = SMIME_DECRYPT;
 141                 else if (!strcmp (*args, "-sign"))
 142                         operation = SMIME_SIGN;
 143                 else if (!strcmp (*args, "-resign"))
 144                         operation = SMIME_RESIGN;
 145                 else if (!strcmp (*args, "-verify"))
 146                         operation = SMIME_VERIFY;
 147                 else if (!strcmp (*args, "-pk7out"))
 148                         operation = SMIME_PK7OUT;
 149 #ifndef OPENSSL_NO_DES
 150                 else if (!strcmp (*args, "-des3"))
 151                                 cipher = EVP_des_ede3_cbc();
 152                 else if (!strcmp (*args, "-des"))
 153                                 cipher = EVP_des_cbc();
 154 #endif
 155 #ifndef OPENSSL_NO_RC2
 156                 else if (!strcmp (*args, "-rc2-40"))
 157                                 cipher = EVP_rc2_40_cbc();
 158                 else if (!strcmp (*args, "-rc2-128"))
 159                                 cipher = EVP_rc2_cbc();
 160                 else if (!strcmp (*args, "-rc2-64"))
 161                                 cipher = EVP_rc2_64_cbc();
 162 #endif
 163 #ifndef OPENSSL_NO_AES
 164                 else if (!strcmp(*args,"-aes128"))
 165                                 cipher = EVP_aes_128_cbc();
 166                 else if (!strcmp(*args,"-aes192"))
 167                                 cipher = EVP_aes_192_cbc();
 168                 else if (!strcmp(*args,"-aes256"))
 169                                 cipher = EVP_aes_256_cbc();
 170 #endif
 171 #ifndef OPENSSL_NO_CAMELLIA
 172                 else if (!strcmp(*args,"-camellia128"))
 173                                 cipher = EVP_camellia_128_cbc();
 174                 else if (!strcmp(*args,"-camellia192"))
 175                                 cipher = EVP_camellia_192_cbc();
 176                 else if (!strcmp(*args,"-camellia256"))
 177                                 cipher = EVP_camellia_256_cbc();
 178 #endif
 179                 else if (!strcmp (*args, "-text"))
 180                                 flags |= PKCS7_TEXT;
 181                 else if (!strcmp (*args, "-nointern"))
 182                                 flags |= PKCS7_NOINTERN;
 183                 else if (!strcmp (*args, "-noverify"))
 184                                 flags |= PKCS7_NOVERIFY;
 185                 else if (!strcmp (*args, "-nochain"))
 186                                 flags |= PKCS7_NOCHAIN;
 187                 else if (!strcmp (*args, "-nocerts"))
 188                                 flags |= PKCS7_NOCERTS;
 189                 else if (!strcmp (*args, "-noattr"))
 190                                 flags |= PKCS7_NOATTR;
 191                 else if (!strcmp (*args, "-nodetach"))
 192                                 flags &= ~PKCS7_DETACHED;
 193                 else if (!strcmp (*args, "-nosmimecap"))
 194                                 flags |= PKCS7_NOSMIMECAP;
 195                 else if (!strcmp (*args, "-binary"))
 196                                 flags |= PKCS7_BINARY;
 197                 else if (!strcmp (*args, "-nosigs"))
 198                                 flags |= PKCS7_NOSIGS;
 199                 else if (!strcmp (*args, "-nooldmime"))
 200                                 flags |= PKCS7_NOOLDMIMETYPE;
 201                 else if (!strcmp (*args, "-crlfeol"))
 202                                 flags |= PKCS7_CRLFEOL;
 203                 else if (!strcmp(*args,"-rand"))
 204                         {
 205                         if (!args[1])
 206                                 goto argerr;
 207                         args++;
 208                         inrand = *args;
 209                         need_rand = 1;
 210                         }
 211 #ifndef OPENSSL_NO_ENGINE
 212                 else if (!strcmp(*args,"-engine"))
 213                         {
 214                         if (!args[1])
 215                                 goto argerr;
 216                         engine = *++args;
 217                         }
 218 #endif
 219                 else if (!strcmp(*args,"-passin"))
 220                         {
 221                         if (!args[1])
 222                                 goto argerr;
 223                         passargin = *++args;
 224                         }
 225                 else if (!strcmp (*args, "-to"))
 226                         {
 227                         if (!args[1])
 228                                 goto argerr;
 229                         to = *++args;
 230                         }
 231                 else if (!strcmp (*args, "-from"))
 232                         {
 233                         if (!args[1])
 234                                 goto argerr;
 235                         from = *++args;
 236                         }
 237                 else if (!strcmp (*args, "-subject"))
 238                         {
 239                         if (!args[1])
 240                                 goto argerr;
 241                         subject = *++args;
 242                         }
 243                 else if (!strcmp (*args, "-signer"))
 244                         {
 245                         if (!args[1])
 246                                 goto argerr;
 247                         /* If previous -signer argument add signer to list */
 248
 249                         if (signerfile)
 250                                 {
 251                                 if (!sksigners)
 252                                         sksigners = sk_new_null();
 253                                 sk_push(sksigners, signerfile);
 254                                 if (!keyfile)
 255                                         keyfile = signerfile;
 256                                 if (!skkeys)
 257                                         skkeys = sk_new_null();
 258                                 sk_push(skkeys, keyfile);
 259                                 keyfile = NULL;
 260                                 }
 261                         signerfile = *++args;
 262                         }
 263                 else if (!strcmp (*args, "-recip"))
 264                         {
 265                         if (!args[1])
 266                                 goto argerr;
 267                         recipfile = *++args;
 268                         }
 269                 else if (!strcmp (*args, "-md"))
 270                         {
 271                         if (!args[1])
 272                                 goto argerr;
 273                         sign_md = EVP_get_digestbyname(*++args);
 274                         if (sign_md == NULL)
 275                                 {
 276                                 BIO_printf(bio_err, "Unknown digest %s\n",
 277                                                         *args);
 278                                 goto argerr;
 279                                 }
 280                         }
 281                 else if (!strcmp (*args, "-inkey"))
 282                         {
 283                         if (!args[1])
 284                                 goto argerr;
 285                         /* If previous -inkey arument add signer to list */
 286                         if (keyfile)
 287                                 {
 288                                 if (!signerfile)
 289                                         {
 290                                         BIO_puts(bio_err, "Illegal -inkey without -signer\n");
 291                                         goto argerr;
 292                                         }
 293                                 if (!sksigners)
 294                                         sksigners = sk_new_null();
 295                                 sk_push(sksigners, signerfile);
 296                                 signerfile = NULL;
 297                                 if (!skkeys)
 298                                         skkeys = sk_new_null();
 299                                 sk_push(skkeys, keyfile);
 300                                 }
 301                         keyfile = *++args;
 302                         }
 303                 else if (!strcmp (*args, "-keyform"))
 304                         {
 305                         if (!args[1])
 306                                 goto argerr;
 307                         keyform = str2fmt(*++args);
 308                         }
 309                 else if (!strcmp (*args, "-certfile"))
 310                         {
 311                         if (!args[1])
 312                                 goto argerr;
 313                         certfile = *++args;
 314                         }
 315                 else if (!strcmp (*args, "-CAfile"))
 316                         {
 317                         if (!args[1])
 318                                 goto argerr;
 319                         CAfile = *++args;
 320                         }
 321                 else if (!strcmp (*args, "-CApath"))
 322                         {
 323                         if (!args[1])
 324                                 goto argerr;
 325                         CApath = *++args;
 326                         }
 327                 else if (!strcmp (*args, "-in"))
 328                         {
 329                         if (!args[1])
 330                                 goto argerr;
 331                         infile = *++args;
 332                         }
 333                 else if (!strcmp (*args, "-inform"))
 334                         {
 335                         if (!args[1])
 336                                 goto argerr;
 337                         informat = str2fmt(*++args);
 338                         }
 339                 else if (!strcmp (*args, "-outform"))
 340                         {
 341                         if (!args[1])
 342                                 goto argerr;
 343                         outformat = str2fmt(*++args);
 344                         }
 345                 else if (!strcmp (*args, "-out"))
 346                         {
 347                         if (!args[1])
 348                                 goto argerr;
 349                         outfile = *++args;
 350                         }
 351                 else if (!strcmp (*args, "-content"))
 352                         {
 353                         if (!args[1])
 354                                 goto argerr;
 355                         contfile = *++args;
 356                         }
 357                 else if (args_verify(&args, NULL, &badarg, bio_err, &vpm))
 358                         continue;
 359                 else if ((cipher = EVP_get_cipherbyname(*args + 1)) == NULL)
 360                         badarg = 1;
 361                 args++;
 362                 }
 363
 364         if (!(operation & SMIME_SIGNERS) && (skkeys || sksigners))
 365                 {
 366                 BIO_puts(bio_err, "Multiple signers or keys not allowed\n");
 367                 goto argerr;
 368                 }
 369
 370         if (operation & SMIME_SIGNERS)
 371                 {
 372                 /* Check to see if any final signer needs to be appended */
 373                 if (keyfile && !signerfile)
 374                         {
 375                         BIO_puts(bio_err, "Illegal -inkey without -signer\n");
 376                         goto argerr;
 377                         }
 378                 if (signerfile)
 379                         {
 380                         if (!sksigners)
 381                                 sksigners = sk_new_null();
 382                         sk_push(sksigners, signerfile);
 383                         if (!skkeys)
 384                                 skkeys = sk_new_null();
 385                         if (!keyfile)
 386                                 keyfile = signerfile;
 387                         sk_push(skkeys, keyfile);
 388                         }
 389                 if (!sksigners)
 390                         {
 391                         BIO_printf(bio_err, "No signer certificate specified\n");
 392                         badarg = 1;
 393                         }
 394                 signerfile = NULL;
 395                 keyfile = NULL;
 396                 need_rand = 1;
 397                 }
 398         else if (operation == SMIME_DECRYPT)
 399                 {
 400                 if (!recipfile && !keyfile)
 401                         {
 402                         BIO_printf(bio_err, "No recipient certificate or key specified\n");
 403                         badarg = 1;
 404                         }
 405                 }
 406         else if (operation == SMIME_ENCRYPT)
 407                 {
 408                 if (!*args)
 409                         {
 410                         BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
 411                         badarg = 1;
 412                         }
 413                 need_rand = 1;
 414                 }
 415         else if (!operation)
 416                 badarg = 1;
 417
 418         if (badarg)
 419                 {
 420                 argerr:
 421                 BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n");
 422                 BIO_printf (bio_err, "where options are\n");
 423                 BIO_printf (bio_err, "-encrypt       encrypt message\n");
 424                 BIO_printf (bio_err, "-decrypt       decrypt encrypted message\n");
 425                 BIO_printf (bio_err, "-sign          sign message\n");
 426                 BIO_printf (bio_err, "-verify        verify signed message\n");
 427                 BIO_printf (bio_err, "-pk7out        output PKCS#7 structure\n");
 428 #ifndef OPENSSL_NO_DES
 429                 BIO_printf (bio_err, "-des3          encrypt with triple DES\n");
 430                 BIO_printf (bio_err, "-des           encrypt with DES\n");
 431 #endif
 432 #ifndef OPENSSL_NO_RC2
 433                 BIO_printf (bio_err, "-rc2-40        encrypt with RC2-40 (default)\n");
 434                 BIO_printf (bio_err, "-rc2-64        encrypt with RC2-64\n");
 435                 BIO_printf (bio_err, "-rc2-128       encrypt with RC2-128\n");
 436 #endif
 437 #ifndef OPENSSL_NO_AES
 438                 BIO_printf (bio_err, "-aes128, -aes192, -aes256\n");
 439                 BIO_printf (bio_err, "               encrypt PEM output with cbc aes\n");
 440 #endif
 441 #ifndef OPENSSL_NO_CAMELLIA
 442                 BIO_printf (bio_err, "-camellia128, -camellia192, -camellia256\n");
 443                 BIO_printf (bio_err, "               encrypt PEM output with cbc camellia\n");
 444 #endif
 445                 BIO_printf (bio_err, "-nointern      don't search certificates in message for signer\n");
 446                 BIO_printf (bio_err, "-nosigs        don't verify message signature\n");
 447                 BIO_printf (bio_err, "-noverify      don't verify signers certificate\n");
 448                 BIO_printf (bio_err, "-nocerts       don't include signers certificate when signing\n");
 449                 BIO_printf (bio_err, "-nodetach      use opaque signing\n");
 450                 BIO_printf (bio_err, "-noattr        don't include any signed attributes\n");
 451                 BIO_printf (bio_err, "-binary        don't translate message to text\n");
 452                 BIO_printf (bio_err, "-certfile file other certificates file\n");
 453                 BIO_printf (bio_err, "-signer file   signer certificate file\n");
 454                 BIO_printf (bio_err, "-recip  file   recipient certificate file for decryption\n");
 455                 BIO_printf (bio_err, "-in file       input file\n");
 456                 BIO_printf (bio_err, "-inform arg    input format SMIME (default), PEM or DER\n");
 457                 BIO_printf (bio_err, "-inkey file    input private key (if not signer or recipient)\n");
 458                 BIO_printf (bio_err, "-keyform arg   input private key format (PEM or ENGINE)\n");
 459                 BIO_printf (bio_err, "-out file      output file\n");
 460                 BIO_printf (bio_err, "-outform arg   output format SMIME (default), PEM or DER\n");
 461                 BIO_printf (bio_err, "-content file  supply or override content for detached signature\n");
 462                 BIO_printf (bio_err, "-to addr       to address\n");
 463                 BIO_printf (bio_err, "-from ad       from address\n");
 464                 BIO_printf (bio_err, "-subject s     subject\n");
 465                 BIO_printf (bio_err, "-text          include or delete text MIME headers\n");
 466                 BIO_printf (bio_err, "-CApath dir    trusted certificates directory\n");
 467                 BIO_printf (bio_err, "-CAfile file   trusted certificates file\n");
 468                 BIO_printf (bio_err, "-crl_check     check revocation status of signer's certificate using CRLs\n");
 469                 BIO_printf (bio_err, "-crl_check_all check revocation status of signer's certificate chain using CRLs\n");
 470 #ifndef OPENSSL_NO_ENGINE
 471                 BIO_printf (bio_err, "-engine e      use engine e, possibly a hardware device.\n");
 472 #endif
 473                 BIO_printf (bio_err, "-passin arg    input file pass phrase source\n");
 474                 BIO_printf(bio_err,  "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
 475                 BIO_printf(bio_err,  "               load the file (or the files in the directory) into\n");
 476                 BIO_printf(bio_err,  "               the random number generator\n");
 477                 BIO_printf (bio_err, "cert.pem       recipient certificate(s) for encryption\n");
 478                 goto end;
 479                 }
 480
 481 #ifndef OPENSSL_NO_ENGINE
 482         e = setup_engine(bio_err, engine, 0);
 483 #endif
 484
 485         if (!app_passwd(bio_err, passargin, NULL, &passin, NULL))
 486                 {
 487                 BIO_printf(bio_err, "Error getting password\n");
 488                 goto end;
 489                 }
 490
 491         if (need_rand)
 492                 {
 493                 app_RAND_load_file(NULL, bio_err, (inrand != NULL));
 494                 if (inrand != NULL)
 495                         BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
 496                                 app_RAND_load_files(inrand));
 497                 }
 498
 499         ret = 2;
 500
 501         if (!(operation & SMIME_SIGNERS))
 502                 flags &= ~PKCS7_DETACHED;
 503
 504         if (operation & SMIME_OP)
 505                 {
 506                 if (outformat == FORMAT_ASN1)
 507                         outmode = "wb";
 508                 }
 509         else
 510                 {
 511                 if (flags & PKCS7_BINARY)
 512                         outmode = "wb";
 513                 }
 514
 515         if (operation & SMIME_IP)
 516                 {
 517                 if (informat == FORMAT_ASN1)
 518                         inmode = "rb";
 519                 }
 520         else
 521                 {
 522                 if (flags & PKCS7_BINARY)
 523                         inmode = "rb";
 524                 }
 525
 526         if (operation == SMIME_ENCRYPT)
 527                 {
 528                 if (!cipher)
 529                         {
 530 #ifndef OPENSSL_NO_RC2
 531                         cipher = EVP_rc2_40_cbc();
 532 #else
 533                         BIO_printf(bio_err, "No cipher selected\n");
 534                         goto end;
 535 #endif
 536                         }
 537                 encerts = sk_X509_new_null();
 538                 while (*args)
 539                         {
 540                         if (!(cert = load_cert(bio_err,*args,FORMAT_PEM,
 541                                 NULL, e, "recipient certificate file")))
 542                                 {
 543 #if 0                           /* An appropriate message is already printed */
 544                                 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", *args);
 545 #endif
 546                                 goto end;
 547                                 }
 548                         sk_X509_push(encerts, cert);
 549                         cert = NULL;
 550                         args++;
 551                         }
 552                 }
 553
 554         if (certfile)
 555                 {
 556                 if (!(other = load_certs(bio_err,certfile,FORMAT_PEM, NULL,
 557                         e, "certificate file")))
 558                         {
 559                         ERR_print_errors(bio_err);
 560                         goto end;
 561                         }
 562                 }
 563
 564         if (recipfile && (operation == SMIME_DECRYPT))
 565                 {
 566                 if (!(recip = load_cert(bio_err,recipfile,FORMAT_PEM,NULL,
 567                         e, "recipient certificate file")))
 568                         {
 569                         ERR_print_errors(bio_err);
 570                         goto end;
 571                         }
 572                 }
 573
 574         if (operation == SMIME_DECRYPT)
 575                 {
 576                 if (!keyfile)
 577                         keyfile = recipfile;
 578                 }
 579         else if (operation == SMIME_SIGN)
 580                 {
 581                 if (!keyfile)
 582                         keyfile = signerfile;
 583                 }
 584         else keyfile = NULL;
 585
 586         if (keyfile)
 587                 {
 588                 key = load_key(bio_err, keyfile, keyform, 0, passin, e,
 589                                "signing key file");
 590                 if (!key)
 591                         goto end;
 592                 }
 593
 594         if (infile)
 595                 {
 596                 if (!(in = BIO_new_file(infile, inmode)))
 597                         {
 598                         BIO_printf (bio_err,
 599                                  "Can't open input file %s\n", infile);
 600                         goto end;
 601                         }
 602                 }
 603         else
 604                 in = BIO_new_fp(stdin, BIO_NOCLOSE);
 605
 606         if (operation & SMIME_IP)
 607                 {
 608                 if (informat == FORMAT_SMIME)
 609                         p7 = SMIME_read_PKCS7(in, &indata);
 610                 else if (informat == FORMAT_PEM)
 611                         p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
 612                 else if (informat == FORMAT_ASN1)
 613                         p7 = d2i_PKCS7_bio(in, NULL);
 614                 else
 615                         {
 616                         BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
 617                         goto end;
 618                         }
 619
 620                 if (!p7)
 621                         {
 622                         BIO_printf(bio_err, "Error reading S/MIME message\n");
 623                         goto end;
 624                         }
 625                 if (contfile)
 626                         {
 627                         BIO_free(indata);
 628                         if (!(indata = BIO_new_file(contfile, "rb")))
 629                                 {
 630                                 BIO_printf(bio_err, "Can't read content file %s\n", contfile);
 631                                 goto end;
 632                                 }
 633                         }
 634                 }
 635
 636         if (outfile)
 637                 {
 638                 if (!(out = BIO_new_file(outfile, outmode)))
 639                         {
 640                         BIO_printf (bio_err,
 641                                  "Can't open output file %s\n", outfile);
 642                         goto end;
 643                         }
 644                 }
 645         else
 646                 {
 647                 out = BIO_new_fp(stdout, BIO_NOCLOSE);
 648 #ifdef OPENSSL_SYS_VMS
 649                 {
 650                     BIO *tmpbio = BIO_new(BIO_f_linebuffer());
 651                     out = BIO_push(tmpbio, out);
 652                 }
 653 #endif
 654                 }
 655
 656         if (operation == SMIME_VERIFY)
 657                 {
 658                 if (!(store = setup_verify(bio_err, CAfile, CApath)))
 659                         goto end;
 660                 X509_STORE_set_verify_cb_func(store, smime_cb);
 661                 if (vpm)
 662                         X509_STORE_set1_param(store, vpm);
 663                 }
 664
 665
 666         ret = 3;
 667
 668         if (operation == SMIME_ENCRYPT)
 669                 p7 = PKCS7_encrypt(encerts, in, cipher, flags);
 670         else if (operation & SMIME_SIGNERS)
 671                 {
 672                 int i;
 673                 /* If detached data and SMIME output enable partial
 674                  * signing.
 675                  */
 676                 if (operation == SMIME_SIGN)
 677                         {
 678                         if ((flags & PKCS7_DETACHED)
 679                                 && (outformat == FORMAT_SMIME))
 680                                 flags |= PKCS7_STREAM;
 681                         flags |= PKCS7_PARTIAL;
 682                         p7 = PKCS7_sign(NULL, NULL, other, in, flags);
 683                         }
 684                 else
 685                         flags |= PKCS7_REUSE_DIGEST;
 686                 for (i = 0; i < sk_num(sksigners); i++)
 687                         {
 688                         signerfile = sk_value(sksigners, i);
 689                         keyfile = sk_value(skkeys, i);
 690                         signer = load_cert(bio_err, signerfile,FORMAT_PEM, NULL,
 691                                         e, "signer certificate");
 692                         if (!signer)
 693                                 goto end;
 694                         key = load_key(bio_err, keyfile, keyform, 0, passin, e,
 695                                "signing key file");
 696                         if (!key)
 697                                 goto end;
 698                         if (!PKCS7_sign_add_signer(p7, signer, key,
 699                                                 sign_md, flags))
 700                                 goto end;
 701                         X509_free(signer);
 702                         signer = NULL;
 703                         EVP_PKEY_free(key);
 704                         key = NULL;
 705                         }
 706                 /* If not streaming or resigning finalize structure */
 707                 if ((operation == SMIME_SIGN) && !(flags & PKCS7_STREAM))
 708                         {
 709                         if (!PKCS7_final(p7, in, flags))
 710                                 goto end;
 711                         }
 712                 }
 713
 714         if (!p7)
 715                 {
 716                 BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
 717                 goto end;
 718                 }
 719
 720         ret = 4;
 721         if (operation == SMIME_DECRYPT)
 722                 {
 723                 if (!PKCS7_decrypt(p7, key, recip, out, flags))
 724                         {
 725                         BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
 726                         goto end;
 727                         }
 728                 }
 729         else if (operation == SMIME_VERIFY)
 730                 {
 731                 STACK_OF(X509) *signers;
 732                 if (PKCS7_verify(p7, other, store, indata, out, flags))
 733                         BIO_printf(bio_err, "Verification successful\n");
 734                 else
 735                         {
 736                         BIO_printf(bio_err, "Verification failure\n");
 737                         goto end;
 738                         }
 739                 signers = PKCS7_get0_signers(p7, other, flags);
 740                 if (!save_certs(signerfile, signers))
 741                         {
 742                         BIO_printf(bio_err, "Error writing signers to %s\n",
 743                                                                 signerfile);
 744                         ret = 5;
 745                         goto end;
 746                         }
 747                 sk_X509_free(signers);
 748                 }
 749         else if (operation == SMIME_PK7OUT)
 750                 PEM_write_bio_PKCS7(out, p7);
 751         else
 752                 {
 753                 if (to)
 754                         BIO_printf(out, "To: %s\n", to);
 755                 if (from)
 756                         BIO_printf(out, "From: %s\n", from);
 757                 if (subject)
 758                         BIO_printf(out, "Subject: %s\n", subject);
 759                 if (outformat == FORMAT_SMIME)
 760                         {
 761                         if (operation == SMIME_RESIGN)
 762                                 SMIME_write_PKCS7(out, p7, indata, flags);
 763                         else
 764                                 SMIME_write_PKCS7(out, p7, in, flags);
 765                         }
 766                 else if (outformat == FORMAT_PEM)
 767                         PEM_write_bio_PKCS7(out,p7);
 768                 else if (outformat == FORMAT_ASN1)
 769                         i2d_PKCS7_bio(out,p7);
 770                 else
 771                         {
 772                         BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
 773                         goto end;
 774                         }
 775                 }
 776         ret = 0;
 777 end:
 778         if (need_rand)
 779                 app_RAND_write_file(NULL, bio_err);
 780         if (ret) ERR_print_errors(bio_err);
 781         sk_X509_pop_free(encerts, X509_free);
 782         sk_X509_pop_free(other, X509_free);
 783         if (vpm)
 784                 X509_VERIFY_PARAM_free(vpm);
 785         if (sksigners)
 786                 sk_free(sksigners);
 787         if (skkeys)
 788                 sk_free(skkeys);
 789         X509_STORE_free(store);
 790         X509_free(cert);
 791         X509_free(recip);
 792         X509_free(signer);
 793         EVP_PKEY_free(key);
 794         PKCS7_free(p7);
 795         BIO_free(in);
 796         BIO_free(indata);
 797         BIO_free_all(out);
 798         if (passin) OPENSSL_free(passin);
 799         return (ret);
 800 }
 801
 802 static int save_certs(char *signerfile, STACK_OF(X509) *signers)
 803         {
 804         int i;
 805         BIO *tmp;
 806         if (!signerfile)
 807                 return 1;
 808         tmp = BIO_new_file(signerfile, "w");
 809         if (!tmp) return 0;
 810         for(i = 0; i < sk_X509_num(signers); i++)
 811                 PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
 812         BIO_free(tmp);
 813         return 1;
 814         }
 815
 816
 817 /* Minimal callback just to output policy info (if any) */
 818
 819 static int smime_cb(int ok, X509_STORE_CTX *ctx)
 820         {
 821         int error;
 822
 823         error = X509_STORE_CTX_get_error(ctx);
 824
 825         if ((error != X509_V_ERR_NO_EXPLICIT_POLICY)
 826                 && ((error != X509_V_OK) || (ok != 2)))
 827                 return ok;
 828
 829         policies_print(NULL, ctx);
 830
 831         return ok;
 832
 833         }