bin/openssl/smime.c

   1 /* $OpenBSD: smime.c,v 1.10 2018/02/07 05:47:55 jsing Exp $ */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) 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
  64 #include "apps.h"
  65
  66 #include <openssl/crypto.h>
  67 #include <openssl/err.h>
  68 #include <openssl/pem.h>
  69 #include <openssl/x509_vfy.h>
  70 #include <openssl/x509v3.h>
  71
  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
  86 smime_main(int argc, char **argv)
  87 {
  88         int operation = 0;
  89         int ret = 0;
  90         char **args;
  91         const char *inmode = "r", *outmode = "w";
  92         char *infile = NULL, *outfile = NULL;
  93         char *signerfile = NULL, *recipfile = NULL;
  94         STACK_OF(OPENSSL_STRING) * sksigners = NULL, *skkeys = NULL;
  95         char *certfile = NULL, *keyfile = NULL, *contfile = NULL;
  96         const EVP_CIPHER *cipher = NULL;
  97         PKCS7 *p7 = NULL;
  98         X509_STORE *store = NULL;
  99         X509 *cert = NULL, *recip = NULL, *signer = NULL;
 100         EVP_PKEY *key = NULL;
 101         STACK_OF(X509) * encerts = NULL, *other = NULL;
 102         BIO *in = NULL, *out = NULL, *indata = NULL;
 103         int badarg = 0;
 104         int flags = PKCS7_DETACHED;
 105         char *to = NULL, *from = NULL, *subject = NULL;
 106         char *CAfile = NULL, *CApath = NULL;
 107         char *passargin = NULL, *passin = NULL;
 108         int indef = 0;
 109         const EVP_MD *sign_md = NULL;
 110         int informat = FORMAT_SMIME, outformat = FORMAT_SMIME;
 111         int keyform = FORMAT_PEM;
 112
 113         X509_VERIFY_PARAM *vpm = NULL;
 114
 115         if (single_execution) {
 116                 if (pledge("stdio cpath wpath rpath tty", NULL) == -1) {
 117                         perror("pledge");
 118                         exit(1);
 119                 }
 120         }
 121
 122         args = argv + 1;
 123         ret = 1;
 124
 125         while (!badarg && *args && *args[0] == '-') {
 126                 if (!strcmp(*args, "-encrypt"))
 127                         operation = SMIME_ENCRYPT;
 128                 else if (!strcmp(*args, "-decrypt"))
 129                         operation = SMIME_DECRYPT;
 130                 else if (!strcmp(*args, "-sign"))
 131                         operation = SMIME_SIGN;
 132                 else if (!strcmp(*args, "-resign"))
 133                         operation = SMIME_RESIGN;
 134                 else if (!strcmp(*args, "-verify"))
 135                         operation = SMIME_VERIFY;
 136                 else if (!strcmp(*args, "-pk7out"))
 137                         operation = SMIME_PK7OUT;
 138 #ifndef OPENSSL_NO_DES
 139                 else if (!strcmp(*args, "-des3"))
 140                         cipher = EVP_des_ede3_cbc();
 141                 else if (!strcmp(*args, "-des"))
 142                         cipher = EVP_des_cbc();
 143 #endif
 144 #ifndef OPENSSL_NO_RC2
 145                 else if (!strcmp(*args, "-rc2-40"))
 146                         cipher = EVP_rc2_40_cbc();
 147                 else if (!strcmp(*args, "-rc2-128"))
 148                         cipher = EVP_rc2_cbc();
 149                 else if (!strcmp(*args, "-rc2-64"))
 150                         cipher = EVP_rc2_64_cbc();
 151 #endif
 152 #ifndef OPENSSL_NO_AES
 153                 else if (!strcmp(*args, "-aes128"))
 154                         cipher = EVP_aes_128_cbc();
 155                 else if (!strcmp(*args, "-aes192"))
 156                         cipher = EVP_aes_192_cbc();
 157                 else if (!strcmp(*args, "-aes256"))
 158                         cipher = EVP_aes_256_cbc();
 159 #endif
 160 #ifndef OPENSSL_NO_CAMELLIA
 161                 else if (!strcmp(*args, "-camellia128"))
 162                         cipher = EVP_camellia_128_cbc();
 163                 else if (!strcmp(*args, "-camellia192"))
 164                         cipher = EVP_camellia_192_cbc();
 165                 else if (!strcmp(*args, "-camellia256"))
 166                         cipher = EVP_camellia_256_cbc();
 167 #endif
 168                 else if (!strcmp(*args, "-text"))
 169                         flags |= PKCS7_TEXT;
 170                 else if (!strcmp(*args, "-nointern"))
 171                         flags |= PKCS7_NOINTERN;
 172                 else if (!strcmp(*args, "-noverify"))
 173                         flags |= PKCS7_NOVERIFY;
 174                 else if (!strcmp(*args, "-nochain"))
 175                         flags |= PKCS7_NOCHAIN;
 176                 else if (!strcmp(*args, "-nocerts"))
 177                         flags |= PKCS7_NOCERTS;
 178                 else if (!strcmp(*args, "-noattr"))
 179                         flags |= PKCS7_NOATTR;
 180                 else if (!strcmp(*args, "-nodetach"))
 181                         flags &= ~PKCS7_DETACHED;
 182                 else if (!strcmp(*args, "-nosmimecap"))
 183                         flags |= PKCS7_NOSMIMECAP;
 184                 else if (!strcmp(*args, "-binary"))
 185                         flags |= PKCS7_BINARY;
 186                 else if (!strcmp(*args, "-nosigs"))
 187                         flags |= PKCS7_NOSIGS;
 188                 else if (!strcmp(*args, "-stream"))
 189                         indef = 1;
 190                 else if (!strcmp(*args, "-indef"))
 191                         indef = 1;
 192                 else if (!strcmp(*args, "-noindef"))
 193                         indef = 0;
 194                 else if (!strcmp(*args, "-nooldmime"))
 195                         flags |= PKCS7_NOOLDMIMETYPE;
 196                 else if (!strcmp(*args, "-crlfeol"))
 197                         flags |= PKCS7_CRLFEOL;
 198                 else if (!strcmp(*args, "-passin")) {
 199                         if (!args[1])
 200                                 goto argerr;
 201                         passargin = *++args;
 202                 } else if (!strcmp(*args, "-to")) {
 203                         if (!args[1])
 204                                 goto argerr;
 205                         to = *++args;
 206                 } else if (!strcmp(*args, "-from")) {
 207                         if (!args[1])
 208                                 goto argerr;
 209                         from = *++args;
 210                 } else if (!strcmp(*args, "-subject")) {
 211                         if (!args[1])
 212                                 goto argerr;
 213                         subject = *++args;
 214                 } else if (!strcmp(*args, "-signer")) {
 215                         if (!args[1])
 216                                 goto argerr;
 217                         /* If previous -signer argument add signer to list */
 218
 219                         if (signerfile) {
 220                                 if (!sksigners)
 221                                         sksigners = sk_OPENSSL_STRING_new_null();
 222                                 sk_OPENSSL_STRING_push(sksigners, signerfile);
 223                                 if (!keyfile)
 224                                         keyfile = signerfile;
 225                                 if (!skkeys)
 226                                         skkeys = sk_OPENSSL_STRING_new_null();
 227                                 sk_OPENSSL_STRING_push(skkeys, keyfile);
 228                                 keyfile = NULL;
 229                         }
 230                         signerfile = *++args;
 231                 } else if (!strcmp(*args, "-recip")) {
 232                         if (!args[1])
 233                                 goto argerr;
 234                         recipfile = *++args;
 235                 } else if (!strcmp(*args, "-md")) {
 236                         if (!args[1])
 237                                 goto argerr;
 238                         sign_md = EVP_get_digestbyname(*++args);
 239                         if (sign_md == NULL) {
 240                                 BIO_printf(bio_err, "Unknown digest %s\n",
 241                                     *args);
 242                                 goto argerr;
 243                         }
 244                 } else if (!strcmp(*args, "-inkey")) {
 245                         if (!args[1])
 246                                 goto argerr;
 247                         /* If previous -inkey arument add signer to list */
 248                         if (keyfile) {
 249                                 if (!signerfile) {
 250                                         BIO_puts(bio_err, "Illegal -inkey without -signer\n");
 251                                         goto argerr;
 252                                 }
 253                                 if (!sksigners)
 254                                         sksigners = sk_OPENSSL_STRING_new_null();
 255                                 sk_OPENSSL_STRING_push(sksigners, signerfile);
 256                                 signerfile = NULL;
 257                                 if (!skkeys)
 258                                         skkeys = sk_OPENSSL_STRING_new_null();
 259                                 sk_OPENSSL_STRING_push(skkeys, keyfile);
 260                         }
 261                         keyfile = *++args;
 262                 } else if (!strcmp(*args, "-keyform")) {
 263                         if (!args[1])
 264                                 goto argerr;
 265                         keyform = str2fmt(*++args);
 266                 } else if (!strcmp(*args, "-certfile")) {
 267                         if (!args[1])
 268                                 goto argerr;
 269                         certfile = *++args;
 270                 } else if (!strcmp(*args, "-CAfile")) {
 271                         if (!args[1])
 272                                 goto argerr;
 273                         CAfile = *++args;
 274                 } else if (!strcmp(*args, "-CApath")) {
 275                         if (!args[1])
 276                                 goto argerr;
 277                         CApath = *++args;
 278                 } else if (!strcmp(*args, "-in")) {
 279                         if (!args[1])
 280                                 goto argerr;
 281                         infile = *++args;
 282                 } else if (!strcmp(*args, "-inform")) {
 283                         if (!args[1])
 284                                 goto argerr;
 285                         informat = str2fmt(*++args);
 286                 } else if (!strcmp(*args, "-outform")) {
 287                         if (!args[1])
 288                                 goto argerr;
 289                         outformat = str2fmt(*++args);
 290                 } else if (!strcmp(*args, "-out")) {
 291                         if (!args[1])
 292                                 goto argerr;
 293                         outfile = *++args;
 294                 } else if (!strcmp(*args, "-content")) {
 295                         if (!args[1])
 296                                 goto argerr;
 297                         contfile = *++args;
 298                 } else if (args_verify(&args, NULL, &badarg, bio_err, &vpm))
 299                         continue;
 300                 else if ((cipher = EVP_get_cipherbyname(*args + 1)) == NULL)
 301                         badarg = 1;
 302                 args++;
 303         }
 304
 305         if (!(operation & SMIME_SIGNERS) && (skkeys || sksigners)) {
 306                 BIO_puts(bio_err, "Multiple signers or keys not allowed\n");
 307                 goto argerr;
 308         }
 309         if (operation & SMIME_SIGNERS) {
 310                 /* Check to see if any final signer needs to be appended */
 311                 if (keyfile && !signerfile) {
 312                         BIO_puts(bio_err, "Illegal -inkey without -signer\n");
 313                         goto argerr;
 314                 }
 315                 if (signerfile) {
 316                         if (!sksigners)
 317                                 sksigners = sk_OPENSSL_STRING_new_null();
 318                         sk_OPENSSL_STRING_push(sksigners, signerfile);
 319                         if (!skkeys)
 320                                 skkeys = sk_OPENSSL_STRING_new_null();
 321                         if (!keyfile)
 322                                 keyfile = signerfile;
 323                         sk_OPENSSL_STRING_push(skkeys, keyfile);
 324                 }
 325                 if (!sksigners) {
 326                         BIO_printf(bio_err, "No signer certificate specified\n");
 327                         badarg = 1;
 328                 }
 329                 signerfile = NULL;
 330                 keyfile = NULL;
 331         } else if (operation == SMIME_DECRYPT) {
 332                 if (!recipfile && !keyfile) {
 333                         BIO_printf(bio_err, "No recipient certificate or key specified\n");
 334                         badarg = 1;
 335                 }
 336         } else if (operation == SMIME_ENCRYPT) {
 337                 if (!*args) {
 338                         BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
 339                         badarg = 1;
 340                 }
 341         } else if (!operation)
 342                 badarg = 1;
 343
 344         if (badarg) {
 345  argerr:
 346                 BIO_printf(bio_err, "Usage smime [options] cert.pem ...\n");
 347                 BIO_printf(bio_err, "where options are\n");
 348                 BIO_printf(bio_err, "-encrypt       encrypt message\n");
 349                 BIO_printf(bio_err, "-decrypt       decrypt encrypted message\n");
 350                 BIO_printf(bio_err, "-sign          sign message\n");
 351                 BIO_printf(bio_err, "-verify        verify signed message\n");
 352                 BIO_printf(bio_err, "-pk7out        output PKCS#7 structure\n");
 353 #ifndef OPENSSL_NO_DES
 354                 BIO_printf(bio_err, "-des3          encrypt with triple DES\n");
 355                 BIO_printf(bio_err, "-des           encrypt with DES\n");
 356 #endif
 357 #ifndef OPENSSL_NO_RC2
 358                 BIO_printf(bio_err, "-rc2-40        encrypt with RC2-40 (default)\n");
 359                 BIO_printf(bio_err, "-rc2-64        encrypt with RC2-64\n");
 360                 BIO_printf(bio_err, "-rc2-128       encrypt with RC2-128\n");
 361 #endif
 362 #ifndef OPENSSL_NO_AES
 363                 BIO_printf(bio_err, "-aes128, -aes192, -aes256\n");
 364                 BIO_printf(bio_err, "               encrypt PEM output with cbc aes\n");
 365 #endif
 366 #ifndef OPENSSL_NO_CAMELLIA
 367                 BIO_printf(bio_err, "-camellia128, -camellia192, -camellia256\n");
 368                 BIO_printf(bio_err, "               encrypt PEM output with cbc camellia\n");
 369 #endif
 370                 BIO_printf(bio_err, "-nointern      don't search certificates in message for signer\n");
 371                 BIO_printf(bio_err, "-nosigs        don't verify message signature\n");
 372                 BIO_printf(bio_err, "-noverify      don't verify signers certificate\n");
 373                 BIO_printf(bio_err, "-nocerts       don't include signers certificate when signing\n");
 374                 BIO_printf(bio_err, "-nodetach      use opaque signing\n");
 375                 BIO_printf(bio_err, "-noattr        don't include any signed attributes\n");
 376                 BIO_printf(bio_err, "-binary        don't translate message to text\n");
 377                 BIO_printf(bio_err, "-certfile file other certificates file\n");
 378                 BIO_printf(bio_err, "-signer file   signer certificate file\n");
 379                 BIO_printf(bio_err, "-recip  file   recipient certificate file for decryption\n");
 380                 BIO_printf(bio_err, "-in file       input file\n");
 381                 BIO_printf(bio_err, "-inform arg    input format SMIME (default), PEM or DER\n");
 382                 BIO_printf(bio_err, "-inkey file    input private key (if not signer or recipient)\n");
 383                 BIO_printf(bio_err, "-keyform arg   input private key format (PEM)\n");
 384                 BIO_printf(bio_err, "-out file      output file\n");
 385                 BIO_printf(bio_err, "-outform arg   output format SMIME (default), PEM or DER\n");
 386                 BIO_printf(bio_err, "-content file  supply or override content for detached signature\n");
 387                 BIO_printf(bio_err, "-to addr       to address\n");
 388                 BIO_printf(bio_err, "-from ad       from address\n");
 389                 BIO_printf(bio_err, "-subject s     subject\n");
 390                 BIO_printf(bio_err, "-text          include or delete text MIME headers\n");
 391                 BIO_printf(bio_err, "-CApath dir    trusted certificates directory\n");
 392                 BIO_printf(bio_err, "-CAfile file   trusted certificates file\n");
 393                 BIO_printf(bio_err, "-crl_check     check revocation status of signer's certificate using CRLs\n");
 394                 BIO_printf(bio_err, "-crl_check_all check revocation status of signer's certificate chain using CRLs\n");
 395                 BIO_printf(bio_err, "-passin arg    input file pass phrase source\n");
 396                 BIO_printf(bio_err, "cert.pem       recipient certificate(s) for encryption\n");
 397                 goto end;
 398         }
 399
 400         if (!app_passwd(bio_err, passargin, NULL, &passin, NULL)) {
 401                 BIO_printf(bio_err, "Error getting password\n");
 402                 goto end;
 403         }
 404         ret = 2;
 405
 406         if (!(operation & SMIME_SIGNERS))
 407                 flags &= ~PKCS7_DETACHED;
 408
 409         if (operation & SMIME_OP) {
 410                 if (outformat == FORMAT_ASN1)
 411                         outmode = "wb";
 412         } else {
 413                 if (flags & PKCS7_BINARY)
 414                         outmode = "wb";
 415         }
 416
 417         if (operation & SMIME_IP) {
 418                 if (informat == FORMAT_ASN1)
 419                         inmode = "rb";
 420         } else {
 421                 if (flags & PKCS7_BINARY)
 422                         inmode = "rb";
 423         }
 424
 425         if (operation == SMIME_ENCRYPT) {
 426                 if (!cipher) {
 427 #ifndef OPENSSL_NO_RC2
 428                         cipher = EVP_rc2_40_cbc();
 429 #else
 430                         BIO_printf(bio_err, "No cipher selected\n");
 431                         goto end;
 432 #endif
 433                 }
 434                 encerts = sk_X509_new_null();
 435                 while (*args) {
 436                         if (!(cert = load_cert(bio_err, *args, FORMAT_PEM,
 437                             NULL, "recipient certificate file"))) {
 438                                 goto end;
 439                         }
 440                         sk_X509_push(encerts, cert);
 441                         cert = NULL;
 442                         args++;
 443                 }
 444         }
 445         if (certfile) {
 446                 if (!(other = load_certs(bio_err, certfile, FORMAT_PEM, NULL,
 447                     "certificate file"))) {
 448                         ERR_print_errors(bio_err);
 449                         goto end;
 450                 }
 451         }
 452         if (recipfile && (operation == SMIME_DECRYPT)) {
 453                 if (!(recip = load_cert(bio_err, recipfile, FORMAT_PEM, NULL,
 454                     "recipient certificate file"))) {
 455                         ERR_print_errors(bio_err);
 456                         goto end;
 457                 }
 458         }
 459         if (operation == SMIME_DECRYPT) {
 460                 if (!keyfile)
 461                         keyfile = recipfile;
 462         } else if (operation == SMIME_SIGN) {
 463                 if (!keyfile)
 464                         keyfile = signerfile;
 465         } else
 466                 keyfile = NULL;
 467
 468         if (keyfile) {
 469                 key = load_key(bio_err, keyfile, keyform, 0, passin,
 470                     "signing key file");
 471                 if (!key)
 472                         goto end;
 473         }
 474         if (infile) {
 475                 if (!(in = BIO_new_file(infile, inmode))) {
 476                         BIO_printf(bio_err,
 477                             "Can't open input file %s\n", infile);
 478                         goto end;
 479                 }
 480         } else
 481                 in = BIO_new_fp(stdin, BIO_NOCLOSE);
 482
 483         if (operation & SMIME_IP) {
 484                 if (informat == FORMAT_SMIME)
 485                         p7 = SMIME_read_PKCS7(in, &indata);
 486                 else if (informat == FORMAT_PEM)
 487                         p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
 488                 else if (informat == FORMAT_ASN1)
 489                         p7 = d2i_PKCS7_bio(in, NULL);
 490                 else {
 491                         BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
 492                         goto end;
 493                 }
 494
 495                 if (!p7) {
 496                         BIO_printf(bio_err, "Error reading S/MIME message\n");
 497                         goto end;
 498                 }
 499                 if (contfile) {
 500                         BIO_free(indata);
 501                         if (!(indata = BIO_new_file(contfile, "rb"))) {
 502                                 BIO_printf(bio_err, "Can't read content file %s\n", contfile);
 503                                 goto end;
 504                         }
 505                 }
 506         }
 507         if (outfile) {
 508                 if (!(out = BIO_new_file(outfile, outmode))) {
 509                         BIO_printf(bio_err,
 510                             "Can't open output file %s\n", outfile);
 511                         goto end;
 512                 }
 513         } else {
 514                 out = BIO_new_fp(stdout, BIO_NOCLOSE);
 515         }
 516
 517         if (operation == SMIME_VERIFY) {
 518                 if (!(store = setup_verify(bio_err, CAfile, CApath)))
 519                         goto end;
 520                 X509_STORE_set_verify_cb(store, smime_cb);
 521                 if (vpm)
 522                         X509_STORE_set1_param(store, vpm);
 523         }
 524         ret = 3;
 525
 526         if (operation == SMIME_ENCRYPT) {
 527                 if (indef)
 528                         flags |= PKCS7_STREAM;
 529                 p7 = PKCS7_encrypt(encerts, in, cipher, flags);
 530         } else if (operation & SMIME_SIGNERS) {
 531                 int i;
 532                 /*
 533                  * If detached data content we only enable streaming if
 534                  * S/MIME output format.
 535                  */
 536                 if (operation == SMIME_SIGN) {
 537                         if (flags & PKCS7_DETACHED) {
 538                                 if (outformat == FORMAT_SMIME)
 539                                         flags |= PKCS7_STREAM;
 540                         } else if (indef)
 541                                 flags |= PKCS7_STREAM;
 542                         flags |= PKCS7_PARTIAL;
 543                         p7 = PKCS7_sign(NULL, NULL, other, in, flags);
 544                         if (!p7)
 545                                 goto end;
 546                 } else
 547                         flags |= PKCS7_REUSE_DIGEST;
 548                 for (i = 0; i < sk_OPENSSL_STRING_num(sksigners); i++) {
 549                         signerfile = sk_OPENSSL_STRING_value(sksigners, i);
 550                         keyfile = sk_OPENSSL_STRING_value(skkeys, i);
 551                         signer = load_cert(bio_err, signerfile, FORMAT_PEM, NULL,
 552                             "signer certificate");
 553                         if (!signer)
 554                                 goto end;
 555                         key = load_key(bio_err, keyfile, keyform, 0, passin,
 556                             "signing key file");
 557                         if (!key)
 558                                 goto end;
 559                         if (!PKCS7_sign_add_signer(p7, signer, key,
 560                                 sign_md, flags))
 561                                 goto end;
 562                         X509_free(signer);
 563                         signer = NULL;
 564                         EVP_PKEY_free(key);
 565                         key = NULL;
 566                 }
 567                 /* If not streaming or resigning finalize structure */
 568                 if ((operation == SMIME_SIGN) && !(flags & PKCS7_STREAM)) {
 569                         if (!PKCS7_final(p7, in, flags))
 570                                 goto end;
 571                 }
 572         }
 573         if (!p7) {
 574                 BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
 575                 goto end;
 576         }
 577         ret = 4;
 578         if (operation == SMIME_DECRYPT) {
 579                 if (!PKCS7_decrypt(p7, key, recip, out, flags)) {
 580                         BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
 581                         goto end;
 582                 }
 583         } else if (operation == SMIME_VERIFY) {
 584                 STACK_OF(X509) * signers;
 585                 if (PKCS7_verify(p7, other, store, indata, out, flags))
 586                         BIO_printf(bio_err, "Verification successful\n");
 587                 else {
 588                         BIO_printf(bio_err, "Verification failure\n");
 589                         goto end;
 590                 }
 591                 signers = PKCS7_get0_signers(p7, other, flags);
 592                 if (!save_certs(signerfile, signers)) {
 593                         BIO_printf(bio_err, "Error writing signers to %s\n",
 594                             signerfile);
 595                         ret = 5;
 596                         goto end;
 597                 }
 598                 sk_X509_free(signers);
 599         } else if (operation == SMIME_PK7OUT)
 600                 PEM_write_bio_PKCS7(out, p7);
 601         else {
 602                 if (to)
 603                         BIO_printf(out, "To: %s\n", to);
 604                 if (from)
 605                         BIO_printf(out, "From: %s\n", from);
 606                 if (subject)
 607                         BIO_printf(out, "Subject: %s\n", subject);
 608                 if (outformat == FORMAT_SMIME) {
 609                         if (operation == SMIME_RESIGN)
 610                                 SMIME_write_PKCS7(out, p7, indata, flags);
 611                         else
 612                                 SMIME_write_PKCS7(out, p7, in, flags);
 613                 } else if (outformat == FORMAT_PEM)
 614                         PEM_write_bio_PKCS7_stream(out, p7, in, flags);
 615                 else if (outformat == FORMAT_ASN1)
 616                         i2d_PKCS7_bio_stream(out, p7, in, flags);
 617                 else {
 618                         BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
 619                         goto end;
 620                 }
 621         }
 622         ret = 0;
 623  end:
 624         if (ret)
 625                 ERR_print_errors(bio_err);
 626         sk_X509_pop_free(encerts, X509_free);
 627         sk_X509_pop_free(other, X509_free);
 628         X509_VERIFY_PARAM_free(vpm);
 629         sk_OPENSSL_STRING_free(sksigners);
 630         sk_OPENSSL_STRING_free(skkeys);
 631         X509_STORE_free(store);
 632         X509_free(cert);
 633         X509_free(recip);
 634         X509_free(signer);
 635         EVP_PKEY_free(key);
 636         PKCS7_free(p7);
 637         BIO_free(in);
 638         BIO_free(indata);
 639         BIO_free_all(out);
 640         free(passin);
 641
 642         return (ret);
 643 }
 644
 645 static int
 646 save_certs(char *signerfile, STACK_OF(X509) * signers)
 647 {
 648         int i;
 649         BIO *tmp;
 650         if (!signerfile)
 651                 return 1;
 652         tmp = BIO_new_file(signerfile, "w");
 653         if (!tmp)
 654                 return 0;
 655         for (i = 0; i < sk_X509_num(signers); i++)
 656                 PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
 657         BIO_free(tmp);
 658         return 1;
 659 }
 660
 661
 662 /* Minimal callback just to output policy info (if any) */
 663
 664 static int
 665 smime_cb(int ok, X509_STORE_CTX * ctx)
 666 {
 667         int error;
 668
 669         error = X509_STORE_CTX_get_error(ctx);
 670
 671         if ((error != X509_V_ERR_NO_EXPLICIT_POLICY)
 672             && ((error != X509_V_OK) || (ok != 2)))
 673                 return ok;
 674
 675         policies_print(NULL, ctx);
 676
 677         return ok;
 678
 679 }