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     const char *inmode = "r", *outmode = "w";
 174     OPTION_CHOICE o;
 175     int flags = PKCS7_DETACHED, operation = 0, ret = 0, need_rand = 0, indef =
 176         0;
 177     int informat = FORMAT_SMIME, outformat = FORMAT_SMIME, keyform =
 178         FORMAT_PEM;
 179     int vpmtouched = 0, rv = 0;
 180     ENGINE *e = NULL;
 181
 182     if ((vpm = X509_VERIFY_PARAM_new()) == NULL)
 183         return 1;
 184
 185     prog = opt_init(argc, argv, smime_options);
 186     while ((o = opt_next()) != OPT_EOF) {
 187         switch (o) {
 188         case OPT_EOF:
 189         case OPT_ERR:
 190  opthelp:
 191             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 192             goto end;
 193         case OPT_HELP:
 194             opt_help(smime_options);
 195             ret = 0;
 196             goto end;
 197         case OPT_INFORM:
 198             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
 199                 goto opthelp;
 200             break;
 201         case OPT_IN:
 202             infile = opt_arg();
 203             break;
 204         case OPT_OUTFORM:
 205             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
 206                 goto opthelp;
 207             break;
 208         case OPT_OUT:
 209             outfile = opt_arg();
 210             break;
 211         case OPT_ENCRYPT:
 212             operation = SMIME_ENCRYPT;
 213             break;
 214         case OPT_DECRYPT:
 215             operation = SMIME_DECRYPT;
 216             break;
 217         case OPT_SIGN:
 218             operation = SMIME_SIGN;
 219             break;
 220         case OPT_RESIGN:
 221             operation = SMIME_RESIGN;
 222             break;
 223         case OPT_VERIFY:
 224             operation = SMIME_VERIFY;
 225             break;
 226         case OPT_PK7OUT:
 227             operation = SMIME_PK7OUT;
 228             break;
 229         case OPT_TEXT:
 230             flags |= PKCS7_TEXT;
 231             break;
 232         case OPT_NOINTERN:
 233             flags |= PKCS7_NOINTERN;
 234             break;
 235         case OPT_NOVERIFY:
 236             flags |= PKCS7_NOVERIFY;
 237             break;
 238         case OPT_NOCHAIN:
 239             flags |= PKCS7_NOCHAIN;
 240             break;
 241         case OPT_NOCERTS:
 242             flags |= PKCS7_NOCERTS;
 243             break;
 244         case OPT_NOATTR:
 245             flags |= PKCS7_NOATTR;
 246             break;
 247         case OPT_NODETACH:
 248             flags &= ~PKCS7_DETACHED;
 249             break;
 250         case OPT_NOSMIMECAP:
 251             flags |= PKCS7_NOSMIMECAP;
 252             break;
 253         case OPT_BINARY:
 254             flags |= PKCS7_BINARY;
 255             break;
 256         case OPT_NOSIGS:
 257             flags |= PKCS7_NOSIGS;
 258             break;
 259         case OPT_STREAM:
 260         case OPT_INDEF:
 261             indef = 1;
 262             break;
 263         case OPT_NOINDEF:
 264             indef = 0;
 265             break;
 266         case OPT_NOOLDMIME:
 267             flags |= PKCS7_NOOLDMIMETYPE;
 268             break;
 269         case OPT_CRLFEOL:
 270             flags |= PKCS7_CRLFEOL;
 271             break;
 272         case OPT_RAND:
 273             inrand = opt_arg();
 274             need_rand = 1;
 275             break;
 276         case OPT_ENGINE:
 277             e = setup_engine(opt_arg(), 0);
 278             break;
 279         case OPT_PASSIN:
 280             passinarg = opt_arg();
 281             break;
 282         case OPT_TO:
 283             to = opt_arg();
 284             break;
 285         case OPT_FROM:
 286             from = opt_arg();
 287             break;
 288         case OPT_SUBJECT:
 289             subject = opt_arg();
 290             break;
 291         case OPT_SIGNER:
 292             /* If previous -signer argument add signer to list */
 293             if (signerfile) {
 294                 if (sksigners == NULL
 295                     && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
 296                     goto end;
 297                 sk_OPENSSL_STRING_push(sksigners, signerfile);
 298                 if (keyfile == NULL)
 299                     keyfile = signerfile;
 300                 if (skkeys == NULL
 301                     && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
 302                     goto end;
 303                 sk_OPENSSL_STRING_push(skkeys, keyfile);
 304                 keyfile = NULL;
 305             }
 306             signerfile = opt_arg();
 307             break;
 308         case OPT_RECIP:
 309             recipfile = opt_arg();
 310             break;
 311         case OPT_MD:
 312             if (!opt_md(opt_arg(), &sign_md))
 313                 goto opthelp;
 314             break;
 315         case OPT_CIPHER:
 316             if (!opt_cipher(opt_unknown(), &cipher))
 317                 goto opthelp;
 318             break;
 319         case OPT_INKEY:
 320             /* If previous -inkey arument add signer to list */
 321             if (keyfile) {
 322                 if (signerfile == NULL) {
 323                     BIO_printf(bio_err,
 324                                "%s: Must have -signer before -inkey\n", prog);
 325                     goto opthelp;
 326                 }
 327                 if (sksigners == NULL
 328                     && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
 329                     goto end;
 330                 sk_OPENSSL_STRING_push(sksigners, signerfile);
 331                 signerfile = NULL;
 332                 if (skkeys == NULL
 333                     && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
 334                     goto end;
 335                 sk_OPENSSL_STRING_push(skkeys, keyfile);
 336             }
 337             keyfile = opt_arg();
 338             break;
 339         case OPT_KEYFORM:
 340             if (!opt_format(opt_arg(), OPT_FMT_ANY, &keyform))
 341                 goto opthelp;
 342             break;
 343         case OPT_CERTFILE:
 344             certfile = opt_arg();
 345             break;
 346         case OPT_CAFILE:
 347             CAfile = opt_arg();
 348             break;
 349         case OPT_CAPATH:
 350             CApath = opt_arg();
 351             break;
 352         case OPT_CONTENT:
 353             contfile = opt_arg();
 354             break;
 355         case OPT_V_CASES:
 356             if (!opt_verify(o, vpm))
 357                 goto opthelp;
 358             vpmtouched++;
 359             break;
 360         }
 361     }
 362     argc = opt_num_rest();
 363     argv = opt_rest();
 364
 365     if (!(operation & SMIME_SIGNERS) && (skkeys || sksigners)) {
 366         BIO_puts(bio_err, "Multiple signers or keys not allowed\n");
 367         goto opthelp;
 368     }
 369
 370     if (operation & SMIME_SIGNERS) {
 371         /* Check to see if any final signer needs to be appended */
 372         if (keyfile && !signerfile) {
 373             BIO_puts(bio_err, "Illegal -inkey without -signer\n");
 374             goto opthelp;
 375         }
 376         if (signerfile) {
 377             if (!sksigners
 378                 && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
 379                 goto end;
 380             sk_OPENSSL_STRING_push(sksigners, signerfile);
 381             if (!skkeys && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
 382                 goto end;
 383             if (!keyfile)
 384                 keyfile = signerfile;
 385             sk_OPENSSL_STRING_push(skkeys, keyfile);
 386         }
 387         if (!sksigners) {
 388             BIO_printf(bio_err, "No signer certificate specified\n");
 389             goto opthelp;
 390         }
 391         signerfile = NULL;
 392         keyfile = NULL;
 393         need_rand = 1;
 394     } else if (operation == SMIME_DECRYPT) {
 395         if (!recipfile && !keyfile) {
 396             BIO_printf(bio_err,
 397                        "No recipient certificate or key specified\n");
 398             goto opthelp;
 399         }
 400     } else if (operation == SMIME_ENCRYPT) {
 401         if (argc == 0) {
 402             BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
 403             goto opthelp;
 404         }
 405         need_rand = 1;
 406     } else if (!operation)
 407         goto opthelp;
 408
 409     if (!app_passwd(passinarg, NULL, &passin, NULL)) {
 410         BIO_printf(bio_err, "Error getting password\n");
 411         goto end;
 412     }
 413
 414     if (need_rand) {
 415         app_RAND_load_file(NULL, (inrand != NULL));
 416         if (inrand != NULL)
 417             BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
 418                        app_RAND_load_files(inrand));
 419     }
 420
 421     ret = 2;
 422
 423     if (!(operation & SMIME_SIGNERS))
 424         flags &= ~PKCS7_DETACHED;
 425
 426     if (operation & SMIME_OP) {
 427         if (outformat == FORMAT_ASN1)
 428             outmode = "wb";
 429     } else {
 430         if (flags & PKCS7_BINARY)
 431             outmode = "wb";
 432     }
 433
 434     if (operation & SMIME_IP) {
 435         if (informat == FORMAT_ASN1)
 436             inmode = "rb";
 437     } else {
 438         if (flags & PKCS7_BINARY)
 439             inmode = "rb";
 440     }
 441
 442     if (operation == SMIME_ENCRYPT) {
 443         if (!cipher) {
 444 #ifndef OPENSSL_NO_DES
 445             cipher = EVP_des_ede3_cbc();
 446 #else
 447             BIO_printf(bio_err, "No cipher selected\n");
 448             goto end;
 449 #endif
 450         }
 451         encerts = sk_X509_new_null();
 452         if (!encerts)
 453             goto end;
 454         while (*argv) {
 455             cert = load_cert(*argv, FORMAT_PEM,
 456                              NULL, e, "recipient certificate file");
 457             if (cert == NULL)
 458                 goto end;
 459             sk_X509_push(encerts, cert);
 460             cert = NULL;
 461             argv++;
 462         }
 463     }
 464
 465     if (certfile) {
 466         if (!(other = load_certs(certfile, FORMAT_PEM, NULL,
 467                                  e, "certificate file"))) {
 468             ERR_print_errors(bio_err);
 469             goto end;
 470         }
 471     }
 472
 473     if (recipfile && (operation == SMIME_DECRYPT)) {
 474         if (!(recip = load_cert(recipfile, FORMAT_PEM, NULL,
 475                                 e, "recipient certificate file"))) {
 476             ERR_print_errors(bio_err);
 477             goto end;
 478         }
 479     }
 480
 481     if (operation == SMIME_DECRYPT) {
 482         if (!keyfile)
 483             keyfile = recipfile;
 484     } else if (operation == SMIME_SIGN) {
 485         if (!keyfile)
 486             keyfile = signerfile;
 487     } else
 488         keyfile = NULL;
 489
 490     if (keyfile) {
 491         key = load_key(keyfile, keyform, 0, passin, e, "signing key file");
 492         if (!key)
 493             goto end;
 494     }
 495
 496     in = bio_open_default(infile, inmode);
 497     if (in == NULL)
 498         goto end;
 499
 500     if (operation & SMIME_IP) {
 501         if (informat == FORMAT_SMIME)
 502             p7 = SMIME_read_PKCS7(in, &indata);
 503         else if (informat == FORMAT_PEM)
 504             p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
 505         else if (informat == FORMAT_ASN1)
 506             p7 = d2i_PKCS7_bio(in, NULL);
 507         else {
 508             BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
 509             goto end;
 510         }
 511
 512         if (!p7) {
 513             BIO_printf(bio_err, "Error reading S/MIME message\n");
 514             goto end;
 515         }
 516         if (contfile) {
 517             BIO_free(indata);
 518             if (!(indata = BIO_new_file(contfile, "rb"))) {
 519                 BIO_printf(bio_err, "Can't read content file %s\n", contfile);
 520                 goto end;
 521             }
 522         }
 523     }
 524
 525     out = bio_open_default(outfile, outmode);
 526     if (out == NULL)
 527         goto end;
 528
 529     if (operation == SMIME_VERIFY) {
 530         if (!(store = setup_verify(CAfile, CApath)))
 531             goto end;
 532         X509_STORE_set_verify_cb(store, smime_cb);
 533         if (vpmtouched)
 534             X509_STORE_set1_param(store, vpm);
 535     }
 536
 537     ret = 3;
 538
 539     if (operation == SMIME_ENCRYPT) {
 540         if (indef)
 541             flags |= PKCS7_STREAM;
 542         p7 = PKCS7_encrypt(encerts, in, cipher, flags);
 543     } else if (operation & SMIME_SIGNERS) {
 544         int i;
 545         /*
 546          * If detached data content we only enable streaming if S/MIME output
 547          * format.
 548          */
 549         if (operation == SMIME_SIGN) {
 550             if (flags & PKCS7_DETACHED) {
 551                 if (outformat == FORMAT_SMIME)
 552                     flags |= PKCS7_STREAM;
 553             } else if (indef)
 554                 flags |= PKCS7_STREAM;
 555             flags |= PKCS7_PARTIAL;
 556             p7 = PKCS7_sign(NULL, NULL, other, in, flags);
 557             if (!p7)
 558                 goto end;
 559             if (flags & PKCS7_NOCERTS) {
 560                 for (i = 0; i < sk_X509_num(other); i++) {
 561                     X509 *x = sk_X509_value(other, i);
 562                     PKCS7_add_certificate(p7, x);
 563                 }
 564             }
 565         } else
 566             flags |= PKCS7_REUSE_DIGEST;
 567         for (i = 0; i < sk_OPENSSL_STRING_num(sksigners); i++) {
 568             signerfile = sk_OPENSSL_STRING_value(sksigners, i);
 569             keyfile = sk_OPENSSL_STRING_value(skkeys, i);
 570             signer = load_cert(signerfile, FORMAT_PEM, NULL,
 571                                e, "signer certificate");
 572             if (!signer)
 573                 goto end;
 574             key = load_key(keyfile, keyform, 0, passin, e, "signing key file");
 575             if (!key)
 576                 goto end;
 577             if (!PKCS7_sign_add_signer(p7, signer, key, sign_md, flags))
 578                 goto end;
 579             X509_free(signer);
 580             signer = NULL;
 581             EVP_PKEY_free(key);
 582             key = NULL;
 583         }
 584         /* If not streaming or resigning finalize structure */
 585         if ((operation == SMIME_SIGN) && !(flags & PKCS7_STREAM)) {
 586             if (!PKCS7_final(p7, in, flags))
 587                 goto end;
 588         }
 589     }
 590
 591     if (!p7) {
 592         BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
 593         goto end;
 594     }
 595
 596     ret = 4;
 597     if (operation == SMIME_DECRYPT) {
 598         if (!PKCS7_decrypt(p7, key, recip, out, flags)) {
 599             BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
 600             goto end;
 601         }
 602     } else if (operation == SMIME_VERIFY) {
 603         STACK_OF(X509) *signers;
 604         if (PKCS7_verify(p7, other, store, indata, out, flags))
 605             BIO_printf(bio_err, "Verification successful\n");
 606         else {
 607             BIO_printf(bio_err, "Verification failure\n");
 608             goto end;
 609         }
 610         signers = PKCS7_get0_signers(p7, other, flags);
 611         if (!save_certs(signerfile, signers)) {
 612             BIO_printf(bio_err, "Error writing signers to %s\n", signerfile);
 613             ret = 5;
 614             goto end;
 615         }
 616         sk_X509_free(signers);
 617     } else if (operation == SMIME_PK7OUT)
 618         PEM_write_bio_PKCS7(out, p7);
 619     else {
 620         if (to)
 621             BIO_printf(out, "To: %s\n", to);
 622         if (from)
 623             BIO_printf(out, "From: %s\n", from);
 624         if (subject)
 625             BIO_printf(out, "Subject: %s\n", subject);
 626         if (outformat == FORMAT_SMIME) {
 627             if (operation == SMIME_RESIGN)
 628                 rv = SMIME_write_PKCS7(out, p7, indata, flags);
 629             else
 630                 rv = SMIME_write_PKCS7(out, p7, in, flags);
 631         } else if (outformat == FORMAT_PEM)
 632             rv = PEM_write_bio_PKCS7_stream(out, p7, in, flags);
 633         else if (outformat == FORMAT_ASN1)
 634             rv = i2d_PKCS7_bio_stream(out, p7, in, flags);
 635         else {
 636             BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
 637             goto end;
 638         }
 639         if (rv == 0) {
 640             BIO_printf(bio_err, "Error writing output\n");
 641             ret = 3;
 642             goto end;
 643         }
 644     }
 645     ret = 0;
 646  end:
 647     if (need_rand)
 648         app_RAND_write_file(NULL);
 649     if (ret)
 650         ERR_print_errors(bio_err);
 651     sk_X509_pop_free(encerts, X509_free);
 652     sk_X509_pop_free(other, X509_free);
 653     X509_VERIFY_PARAM_free(vpm);
 654     if (sksigners)
 655         sk_OPENSSL_STRING_free(sksigners);
 656     if (skkeys)
 657         sk_OPENSSL_STRING_free(skkeys);
 658     X509_STORE_free(store);
 659     X509_free(cert);
 660     X509_free(recip);
 661     X509_free(signer);
 662     EVP_PKEY_free(key);
 663     PKCS7_free(p7);
 664     BIO_free(in);
 665     BIO_free(indata);
 666     BIO_free_all(out);
 667     OPENSSL_free(passin);
 668     return (ret);
 669 }
 670
 671 static int save_certs(char *signerfile, STACK_OF(X509) *signers)
 672 {
 673     int i;
 674     BIO *tmp;
 675     if (!signerfile)
 676         return 1;
 677     tmp = BIO_new_file(signerfile, "w");
 678     if (!tmp)
 679         return 0;
 680     for (i = 0; i < sk_X509_num(signers); i++)
 681         PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
 682     BIO_free(tmp);
 683     return 1;
 684 }
 685
 686 /* Minimal callback just to output policy info (if any) */
 687
 688 static int smime_cb(int ok, X509_STORE_CTX *ctx)
 689 {
 690     int error;
 691
 692     error = X509_STORE_CTX_get_error(ctx);
 693
 694     if ((error != X509_V_ERR_NO_EXPLICIT_POLICY)
 695         && ((error != X509_V_OK) || (ok != 2)))
 696         return ok;
 697
 698     policies_print(ctx);
 699
 700     return ok;
 701
 702 }