apps/smime.c

   1 /*
   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 #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 static int save_certs(char *signerfile, STACK_OF(X509) *signers);
  71 static int smime_cb(int ok, X509_STORE_CTX *ctx);
  72
  73 #define SMIME_OP        0x10
  74 #define SMIME_IP        0x20
  75 #define SMIME_SIGNERS   0x40
  76 #define SMIME_ENCRYPT   (1 | SMIME_OP)
  77 #define SMIME_DECRYPT   (2 | SMIME_IP)
  78 #define SMIME_SIGN      (3 | SMIME_OP | SMIME_SIGNERS)
  79 #define SMIME_VERIFY    (4 | SMIME_IP)
  80 #define SMIME_PK7OUT    (5 | SMIME_IP | SMIME_OP)
  81 #define SMIME_RESIGN    (6 | SMIME_IP | SMIME_OP | SMIME_SIGNERS)
  82
  83 typedef enum OPTION_choice {
  84     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  85     OPT_ENCRYPT, OPT_DECRYPT, OPT_SIGN, OPT_RESIGN, OPT_VERIFY,
  86     OPT_PK7OUT, OPT_TEXT, OPT_NOINTERN, OPT_NOVERIFY, OPT_NOCHAIN,
  87     OPT_NOCERTS, OPT_NOATTR, OPT_NODETACH, OPT_NOSMIMECAP,
  88     OPT_BINARY, OPT_NOSIGS, OPT_STREAM, OPT_INDEF, OPT_NOINDEF,
  89     OPT_NOOLDMIME, OPT_CRLFEOL, OPT_RAND, OPT_ENGINE, OPT_PASSIN,
  90     OPT_TO, OPT_FROM, OPT_SUBJECT, OPT_SIGNER, OPT_RECIP, OPT_MD,
  91     OPT_CIPHER, OPT_INKEY, OPT_KEYFORM, OPT_CERTFILE, OPT_CAFILE,
  92     OPT_V_ENUM,
  93     OPT_CAPATH, OPT_IN, OPT_INFORM, OPT_OUT, OPT_OUTFORM, OPT_CONTENT
  94 } OPTION_CHOICE;
  95
  96 OPTIONS smime_options[] = {
  97     {OPT_HELP_STR, 1, '-', "Usage: %s [options] cert.pem...\n"},
  98     {OPT_HELP_STR, 1, '-',
  99         "  cert.pem... recipient certs for encryption\n"},
 100     {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
 101     {"help", OPT_HELP, '-', "Display this summary"},
 102     {"encrypt", OPT_ENCRYPT, '-', "Encrypt message"},
 103     {"decrypt", OPT_DECRYPT, '-', "Decrypt encrypted message"},
 104     {"sign", OPT_SIGN, '-', "Sign message"},
 105     {"verify", OPT_VERIFY, '-', "Verify signed message"},
 106     {"pk7out", OPT_PK7OUT, '-', "Output PKCS#7 structure"},
 107     {"nointern", OPT_NOINTERN, '-',
 108      "Don't search certificates in message for signer"},
 109     {"nosigs", OPT_NOSIGS, '-', "Don't verify message signature"},
 110     {"noverify", OPT_NOVERIFY, '-', "Don't verify signers certificate"},
 111     {"nocerts", OPT_NOCERTS, '-',
 112      "Don't include signers certificate when signing"},
 113     {"nodetach", OPT_NODETACH, '-', "Use opaque signing"},
 114     {"noattr", OPT_NOATTR, '-', "Don't include any signed attributes"},
 115     {"binary", OPT_BINARY, '-', "Don't translate message to text"},
 116     {"certfile", OPT_CERTFILE, '<', "Other certificates file"},
 117     {"signer", OPT_SIGNER, '<', "Signer certificate file"},
 118     {"recip", OPT_RECIP, '<', "Recipient certificate file for decryption"},
 119     {"in", OPT_IN, '<', "Input file"},
 120     {"inform", OPT_INFORM, 'F', "Input format SMIME (default), PEM or DER"},
 121     {"inkey", OPT_INKEY, '<',
 122      "Input private key (if not signer or recipient)"},
 123     {"keyform", OPT_KEYFORM, 'f', "Input private key format (PEM or ENGINE)"},
 124     {"out", OPT_OUT, '>', "Output file"},
 125     {"outform", OPT_OUTFORM, 'F',
 126      "Output format SMIME (default), PEM or DER"},
 127     {"content", OPT_CONTENT, '<',
 128      "Supply or override content for detached signature"},
 129     {"to", OPT_TO, 's', "To address"},
 130     {"from", OPT_FROM, 's', "From address"},
 131     {"subject", OPT_SUBJECT, 's', "Subject"},
 132     {"text", OPT_TEXT, '-', "Include or delete text MIME headers"},
 133     {"CApath", OPT_CAPATH, '/', "Trusted certificates directory"},
 134     {"CAfile", OPT_CAFILE, '<', "Trusted certificates file"},
 135     {"resign", OPT_RESIGN, '-'},
 136     {"nochain", OPT_NOCHAIN, '-'},
 137     {"nosmimecap", OPT_NOSMIMECAP, '-'},
 138     {"stream", OPT_STREAM, '-'},
 139     {"indef", OPT_INDEF, '-'},
 140     {"noindef", OPT_NOINDEF, '-'},
 141     {"nooldmime", OPT_NOOLDMIME, '-'},
 142     {"crlfeol", OPT_CRLFEOL, '-'},
 143     {"rand", OPT_RAND, 's',
 144      "Load the file(s) into the random number generator"},
 145     {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
 146     {"md", OPT_MD, 's'},
 147     {"", OPT_CIPHER, '-', "Any supported cipher"},
 148     OPT_V_OPTIONS,
 149 #ifndef OPENSSL_NO_ENGINE
 150     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
 151 #endif
 152     {NULL}
 153 };
 154
 155 int smime_main(int argc, char **argv)
 156 {
 157     BIO *in = NULL, *out = NULL, *indata = NULL;
 158     EVP_PKEY *key = NULL;
 159     PKCS7 *p7 = NULL;
 160     STACK_OF(OPENSSL_STRING) *sksigners = NULL, *skkeys = NULL;
 161     STACK_OF(X509) *encerts = NULL, *other = NULL;
 162     X509 *cert = NULL, *recip = NULL, *signer = NULL;
 163     X509_STORE *store = NULL;
 164     X509_VERIFY_PARAM *vpm = NULL;
 165     const EVP_CIPHER *cipher = NULL;
 166     const EVP_MD *sign_md = NULL;
 167     char *CAfile = NULL, *CApath = NULL, *inrand = NULL;
 168     char *certfile = NULL, *keyfile = NULL, *contfile = NULL, *prog;
 169     char *infile = NULL, *outfile = NULL, *signerfile = NULL, *recipfile =
 170         NULL;
 171     char *passinarg = NULL, *passin = NULL, *to = NULL, *from =
 172         NULL, *subject = NULL;
 173     OPTION_CHOICE o;
 174     int flags = PKCS7_DETACHED, operation = 0, ret = 0, need_rand = 0, indef =
 175         0;
 176     int informat = FORMAT_SMIME, outformat = FORMAT_SMIME, keyform =
 177         FORMAT_PEM;
 178     int vpmtouched = 0, rv = 0;
 179     ENGINE *e = NULL;
 180
 181     if ((vpm = X509_VERIFY_PARAM_new()) == NULL)
 182         return 1;
 183
 184     prog = opt_init(argc, argv, smime_options);
 185     while ((o = opt_next()) != OPT_EOF) {
 186         switch (o) {
 187         case OPT_EOF:
 188         case OPT_ERR:
 189  opthelp:
 190             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 191             goto end;
 192         case OPT_HELP:
 193             opt_help(smime_options);
 194             ret = 0;
 195             goto end;
 196         case OPT_INFORM:
 197             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
 198                 goto opthelp;
 199             break;
 200         case OPT_IN:
 201             infile = opt_arg();
 202             break;
 203         case OPT_OUTFORM:
 204             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
 205                 goto opthelp;
 206             break;
 207         case OPT_OUT:
 208             outfile = opt_arg();
 209             break;
 210         case OPT_ENCRYPT:
 211             operation = SMIME_ENCRYPT;
 212             break;
 213         case OPT_DECRYPT:
 214             operation = SMIME_DECRYPT;
 215             break;
 216         case OPT_SIGN:
 217             operation = SMIME_SIGN;
 218             break;
 219         case OPT_RESIGN:
 220             operation = SMIME_RESIGN;
 221             break;
 222         case OPT_VERIFY:
 223             operation = SMIME_VERIFY;
 224             break;
 225         case OPT_PK7OUT:
 226             operation = SMIME_PK7OUT;
 227             break;
 228         case OPT_TEXT:
 229             flags |= PKCS7_TEXT;
 230             break;
 231         case OPT_NOINTERN:
 232             flags |= PKCS7_NOINTERN;
 233             break;
 234         case OPT_NOVERIFY:
 235             flags |= PKCS7_NOVERIFY;
 236             break;
 237         case OPT_NOCHAIN:
 238             flags |= PKCS7_NOCHAIN;
 239             break;
 240         case OPT_NOCERTS:
 241             flags |= PKCS7_NOCERTS;
 242             break;
 243         case OPT_NOATTR:
 244             flags |= PKCS7_NOATTR;
 245             break;
 246         case OPT_NODETACH:
 247             flags &= ~PKCS7_DETACHED;
 248             break;
 249         case OPT_NOSMIMECAP:
 250             flags |= PKCS7_NOSMIMECAP;
 251             break;
 252         case OPT_BINARY:
 253             flags |= PKCS7_BINARY;
 254             break;
 255         case OPT_NOSIGS:
 256             flags |= PKCS7_NOSIGS;
 257             break;
 258         case OPT_STREAM:
 259         case OPT_INDEF:
 260             indef = 1;
 261             break;
 262         case OPT_NOINDEF:
 263             indef = 0;
 264             break;
 265         case OPT_NOOLDMIME:
 266             flags |= PKCS7_NOOLDMIMETYPE;
 267             break;
 268         case OPT_CRLFEOL:
 269             flags |= PKCS7_CRLFEOL;
 270             break;
 271         case OPT_RAND:
 272             inrand = opt_arg();
 273             need_rand = 1;
 274             break;
 275         case OPT_ENGINE:
 276             e = setup_engine(opt_arg(), 0);
 277             break;
 278         case OPT_PASSIN:
 279             passinarg = opt_arg();
 280             break;
 281         case OPT_TO:
 282             to = opt_arg();
 283             break;
 284         case OPT_FROM:
 285             from = opt_arg();
 286             break;
 287         case OPT_SUBJECT:
 288             subject = opt_arg();
 289             break;
 290         case OPT_SIGNER:
 291             /* If previous -signer argument add signer to list */
 292             if (signerfile) {
 293                 if (sksigners == NULL
 294                     && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
 295                     goto end;
 296                 sk_OPENSSL_STRING_push(sksigners, signerfile);
 297                 if (keyfile == NULL)
 298                     keyfile = signerfile;
 299                 if (skkeys == NULL
 300                     && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
 301                     goto end;
 302                 sk_OPENSSL_STRING_push(skkeys, keyfile);
 303                 keyfile = NULL;
 304             }
 305             signerfile = opt_arg();
 306             break;
 307         case OPT_RECIP:
 308             recipfile = opt_arg();
 309             break;
 310         case OPT_MD:
 311             if (!opt_md(opt_arg(), &sign_md))
 312                 goto opthelp;
 313             break;
 314         case OPT_CIPHER:
 315             if (!opt_cipher(opt_unknown(), &cipher))
 316                 goto opthelp;
 317             break;
 318         case OPT_INKEY:
 319             /* If previous -inkey arument add signer to list */
 320             if (keyfile) {
 321                 if (signerfile == NULL) {
 322                     BIO_printf(bio_err,
 323                                "%s: Must have -signer before -inkey\n", prog);
 324                     goto opthelp;
 325                 }
 326                 if (sksigners == NULL
 327                     && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
 328                     goto end;
 329                 sk_OPENSSL_STRING_push(sksigners, signerfile);
 330                 signerfile = NULL;
 331                 if (skkeys == NULL
 332                     && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
 333                     goto end;
 334                 sk_OPENSSL_STRING_push(skkeys, keyfile);
 335             }
 336             keyfile = opt_arg();
 337             break;
 338         case OPT_KEYFORM:
 339             if (!opt_format(opt_arg(), OPT_FMT_ANY, &keyform))
 340                 goto opthelp;
 341             break;
 342         case OPT_CERTFILE:
 343             certfile = opt_arg();
 344             break;
 345         case OPT_CAFILE:
 346             CAfile = opt_arg();
 347             break;
 348         case OPT_CAPATH:
 349             CApath = opt_arg();
 350             break;
 351         case OPT_CONTENT:
 352             contfile = opt_arg();
 353             break;
 354         case OPT_V_CASES:
 355             if (!opt_verify(o, vpm))
 356                 goto opthelp;
 357             vpmtouched++;
 358             break;
 359         }
 360     }
 361     argc = opt_num_rest();
 362     argv = opt_rest();
 363
 364     if (!(operation & SMIME_SIGNERS) && (skkeys || sksigners)) {
 365         BIO_puts(bio_err, "Multiple signers or keys not allowed\n");
 366         goto opthelp;
 367     }
 368
 369     if (operation & SMIME_SIGNERS) {
 370         /* Check to see if any final signer needs to be appended */
 371         if (keyfile && !signerfile) {
 372             BIO_puts(bio_err, "Illegal -inkey without -signer\n");
 373             goto opthelp;
 374         }
 375         if (signerfile) {
 376             if (!sksigners
 377                 && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
 378                 goto end;
 379             sk_OPENSSL_STRING_push(sksigners, signerfile);
 380             if (!skkeys && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
 381                 goto end;
 382             if (!keyfile)
 383                 keyfile = signerfile;
 384             sk_OPENSSL_STRING_push(skkeys, keyfile);
 385         }
 386         if (!sksigners) {
 387             BIO_printf(bio_err, "No signer certificate specified\n");
 388             goto opthelp;
 389         }
 390         signerfile = NULL;
 391         keyfile = NULL;
 392         need_rand = 1;
 393     } else if (operation == SMIME_DECRYPT) {
 394         if (!recipfile && !keyfile) {
 395             BIO_printf(bio_err,
 396                        "No recipient certificate or key specified\n");
 397             goto opthelp;
 398         }
 399     } else if (operation == SMIME_ENCRYPT) {
 400         if (argc == 0) {
 401             BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
 402             goto opthelp;
 403         }
 404         need_rand = 1;
 405     } else if (!operation)
 406         goto opthelp;
 407
 408     if (!app_passwd(passinarg, NULL, &passin, NULL)) {
 409         BIO_printf(bio_err, "Error getting password\n");
 410         goto end;
 411     }
 412
 413     if (!app_load_modules(NULL))
 414         goto end;
 415
 416     if (need_rand) {
 417         app_RAND_load_file(NULL, (inrand != NULL));
 418         if (inrand != NULL)
 419             BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
 420                        app_RAND_load_files(inrand));
 421     }
 422
 423     ret = 2;
 424
 425     if (!(operation & SMIME_SIGNERS))
 426         flags &= ~PKCS7_DETACHED;
 427
 428     if (!(operation & SMIME_OP)) {
 429         if (flags & PKCS7_BINARY)
 430             outformat = FORMAT_BINARY;
 431     }
 432
 433     if (!(operation & SMIME_IP)) {
 434         if (flags & PKCS7_BINARY)
 435             informat = FORMAT_BINARY;
 436     }
 437
 438     if (operation == SMIME_ENCRYPT) {
 439         if (!cipher) {
 440 #ifndef OPENSSL_NO_DES
 441             cipher = EVP_des_ede3_cbc();
 442 #else
 443             BIO_printf(bio_err, "No cipher selected\n");
 444             goto end;
 445 #endif
 446         }
 447         encerts = sk_X509_new_null();
 448         if (!encerts)
 449             goto end;
 450         while (*argv) {
 451             cert = load_cert(*argv, FORMAT_PEM,
 452                              NULL, e, "recipient certificate file");
 453             if (cert == NULL)
 454                 goto end;
 455             sk_X509_push(encerts, cert);
 456             cert = NULL;
 457             argv++;
 458         }
 459     }
 460
 461     if (certfile) {
 462         if ((other = load_certs(certfile, FORMAT_PEM, NULL,
 463                                  e, "certificate file")) == NULL) {
 464             ERR_print_errors(bio_err);
 465             goto end;
 466         }
 467     }
 468
 469     if (recipfile && (operation == SMIME_DECRYPT)) {
 470         if ((recip = load_cert(recipfile, FORMAT_PEM, NULL,
 471                                 e, "recipient certificate file")) == NULL) {
 472             ERR_print_errors(bio_err);
 473             goto end;
 474         }
 475     }
 476
 477     if (operation == SMIME_DECRYPT) {
 478         if (!keyfile)
 479             keyfile = recipfile;
 480     } else if (operation == SMIME_SIGN) {
 481         if (!keyfile)
 482             keyfile = signerfile;
 483     } else
 484         keyfile = NULL;
 485
 486     if (keyfile) {
 487         key = load_key(keyfile, keyform, 0, passin, e, "signing key file");
 488         if (!key)
 489             goto end;
 490     }
 491
 492     in = bio_open_default(infile, 'r', informat);
 493     if (in == NULL)
 494         goto end;
 495
 496     if (operation & SMIME_IP) {
 497         if (informat == FORMAT_SMIME)
 498             p7 = SMIME_read_PKCS7(in, &indata);
 499         else if (informat == FORMAT_PEM)
 500             p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
 501         else if (informat == FORMAT_ASN1)
 502             p7 = d2i_PKCS7_bio(in, NULL);
 503         else {
 504             BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
 505             goto end;
 506         }
 507
 508         if (!p7) {
 509             BIO_printf(bio_err, "Error reading S/MIME message\n");
 510             goto end;
 511         }
 512         if (contfile) {
 513             BIO_free(indata);
 514             if ((indata = BIO_new_file(contfile, "rb")) == NULL) {
 515                 BIO_printf(bio_err, "Can't read content file %s\n", contfile);
 516                 goto end;
 517             }
 518         }
 519     }
 520
 521     out = bio_open_default(outfile, 'w', outformat);
 522     if (out == NULL)
 523         goto end;
 524
 525     if (operation == SMIME_VERIFY) {
 526         if ((store = setup_verify(CAfile, CApath)) == NULL)
 527             goto end;
 528         X509_STORE_set_verify_cb(store, smime_cb);
 529         if (vpmtouched)
 530             X509_STORE_set1_param(store, vpm);
 531     }
 532
 533     ret = 3;
 534
 535     if (operation == SMIME_ENCRYPT) {
 536         if (indef)
 537             flags |= PKCS7_STREAM;
 538         p7 = PKCS7_encrypt(encerts, in, cipher, flags);
 539     } else if (operation & SMIME_SIGNERS) {
 540         int i;
 541         /*
 542          * If detached data content we only enable streaming if S/MIME output
 543          * format.
 544          */
 545         if (operation == SMIME_SIGN) {
 546             if (flags & PKCS7_DETACHED) {
 547                 if (outformat == FORMAT_SMIME)
 548                     flags |= PKCS7_STREAM;
 549             } else if (indef)
 550                 flags |= PKCS7_STREAM;
 551             flags |= PKCS7_PARTIAL;
 552             p7 = PKCS7_sign(NULL, NULL, other, in, flags);
 553             if (!p7)
 554                 goto end;
 555             if (flags & PKCS7_NOCERTS) {
 556                 for (i = 0; i < sk_X509_num(other); i++) {
 557                     X509 *x = sk_X509_value(other, i);
 558                     PKCS7_add_certificate(p7, x);
 559                 }
 560             }
 561         } else
 562             flags |= PKCS7_REUSE_DIGEST;
 563         for (i = 0; i < sk_OPENSSL_STRING_num(sksigners); i++) {
 564             signerfile = sk_OPENSSL_STRING_value(sksigners, i);
 565             keyfile = sk_OPENSSL_STRING_value(skkeys, i);
 566             signer = load_cert(signerfile, FORMAT_PEM, NULL,
 567                                e, "signer certificate");
 568             if (!signer)
 569                 goto end;
 570             key = load_key(keyfile, keyform, 0, passin, e, "signing key file");
 571             if (!key)
 572                 goto end;
 573             if (!PKCS7_sign_add_signer(p7, signer, key, sign_md, flags))
 574                 goto end;
 575             X509_free(signer);
 576             signer = NULL;
 577             EVP_PKEY_free(key);
 578             key = NULL;
 579         }
 580         /* If not streaming or resigning finalize structure */
 581         if ((operation == SMIME_SIGN) && !(flags & PKCS7_STREAM)) {
 582             if (!PKCS7_final(p7, in, flags))
 583                 goto end;
 584         }
 585     }
 586
 587     if (!p7) {
 588         BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
 589         goto end;
 590     }
 591
 592     ret = 4;
 593     if (operation == SMIME_DECRYPT) {
 594         if (!PKCS7_decrypt(p7, key, recip, out, flags)) {
 595             BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
 596             goto end;
 597         }
 598     } else if (operation == SMIME_VERIFY) {
 599         STACK_OF(X509) *signers;
 600         if (PKCS7_verify(p7, other, store, indata, out, flags))
 601             BIO_printf(bio_err, "Verification successful\n");
 602         else {
 603             BIO_printf(bio_err, "Verification failure\n");
 604             goto end;
 605         }
 606         signers = PKCS7_get0_signers(p7, other, flags);
 607         if (!save_certs(signerfile, signers)) {
 608             BIO_printf(bio_err, "Error writing signers to %s\n", signerfile);
 609             ret = 5;
 610             goto end;
 611         }
 612         sk_X509_free(signers);
 613     } else if (operation == SMIME_PK7OUT)
 614         PEM_write_bio_PKCS7(out, p7);
 615     else {
 616         if (to)
 617             BIO_printf(out, "To: %s\n", to);
 618         if (from)
 619             BIO_printf(out, "From: %s\n", from);
 620         if (subject)
 621             BIO_printf(out, "Subject: %s\n", subject);
 622         if (outformat == FORMAT_SMIME) {
 623             if (operation == SMIME_RESIGN)
 624                 rv = SMIME_write_PKCS7(out, p7, indata, flags);
 625             else
 626                 rv = SMIME_write_PKCS7(out, p7, in, flags);
 627         } else if (outformat == FORMAT_PEM)
 628             rv = PEM_write_bio_PKCS7_stream(out, p7, in, flags);
 629         else if (outformat == FORMAT_ASN1)
 630             rv = i2d_PKCS7_bio_stream(out, p7, in, flags);
 631         else {
 632             BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
 633             goto end;
 634         }
 635         if (rv == 0) {
 636             BIO_printf(bio_err, "Error writing output\n");
 637             ret = 3;
 638             goto end;
 639         }
 640     }
 641     ret = 0;
 642  end:
 643     if (need_rand)
 644         app_RAND_write_file(NULL);
 645     if (ret)
 646         ERR_print_errors(bio_err);
 647     sk_X509_pop_free(encerts, X509_free);
 648     sk_X509_pop_free(other, X509_free);
 649     X509_VERIFY_PARAM_free(vpm);
 650     sk_OPENSSL_STRING_free(sksigners);
 651     sk_OPENSSL_STRING_free(skkeys);
 652     X509_STORE_free(store);
 653     X509_free(cert);
 654     X509_free(recip);
 655     X509_free(signer);
 656     EVP_PKEY_free(key);
 657     PKCS7_free(p7);
 658     BIO_free(in);
 659     BIO_free(indata);
 660     BIO_free_all(out);
 661     OPENSSL_free(passin);
 662     return (ret);
 663 }
 664
 665 static int save_certs(char *signerfile, STACK_OF(X509) *signers)
 666 {
 667     int i;
 668     BIO *tmp;
 669     if (!signerfile)
 670         return 1;
 671     tmp = BIO_new_file(signerfile, "w");
 672     if (!tmp)
 673         return 0;
 674     for (i = 0; i < sk_X509_num(signers); i++)
 675         PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
 676     BIO_free(tmp);
 677     return 1;
 678 }
 679
 680 /* Minimal callback just to output policy info (if any) */
 681
 682 static int smime_cb(int ok, X509_STORE_CTX *ctx)
 683 {
 684     int error;
 685
 686     error = X509_STORE_CTX_get_error(ctx);
 687
 688     if ((error != X509_V_ERR_NO_EXPLICIT_POLICY)
 689         && ((error != X509_V_OK) || (ok != 2)))
 690         return ok;
 691
 692     policies_print(ctx);
 693
 694     return ok;
 695
 696 }