apps/smime.c

   1 /*
   2  * Copyright 1999-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /* S/MIME utility function */
  11
  12 #include <stdio.h>
  13 #include <string.h>
  14 #include "apps.h"
  15 #include <openssl/crypto.h>
  16 #include <openssl/pem.h>
  17 #include <openssl/err.h>
  18 #include <openssl/x509_vfy.h>
  19 #include <openssl/x509v3.h>
  20
  21 static int save_certs(char *signerfile, STACK_OF(X509) *signers);
  22 static int smime_cb(int ok, X509_STORE_CTX *ctx);
  23
  24 #define SMIME_OP        0x10
  25 #define SMIME_IP        0x20
  26 #define SMIME_SIGNERS   0x40
  27 #define SMIME_ENCRYPT   (1 | SMIME_OP)
  28 #define SMIME_DECRYPT   (2 | SMIME_IP)
  29 #define SMIME_SIGN      (3 | SMIME_OP | SMIME_SIGNERS)
  30 #define SMIME_VERIFY    (4 | SMIME_IP)
  31 #define SMIME_PK7OUT    (5 | SMIME_IP | SMIME_OP)
  32 #define SMIME_RESIGN    (6 | SMIME_IP | SMIME_OP | SMIME_SIGNERS)
  33
  34 typedef enum OPTION_choice {
  35     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  36     OPT_ENCRYPT, OPT_DECRYPT, OPT_SIGN, OPT_RESIGN, OPT_VERIFY,
  37     OPT_PK7OUT, OPT_TEXT, OPT_NOINTERN, OPT_NOVERIFY, OPT_NOCHAIN,
  38     OPT_NOCERTS, OPT_NOATTR, OPT_NODETACH, OPT_NOSMIMECAP,
  39     OPT_BINARY, OPT_NOSIGS, OPT_STREAM, OPT_INDEF, OPT_NOINDEF,
  40     OPT_CRLFEOL, OPT_RAND, OPT_ENGINE, OPT_PASSIN,
  41     OPT_TO, OPT_FROM, OPT_SUBJECT, OPT_SIGNER, OPT_RECIP, OPT_MD,
  42     OPT_CIPHER, OPT_INKEY, OPT_KEYFORM, OPT_CERTFILE, OPT_CAFILE,
  43     OPT_V_ENUM,
  44     OPT_CAPATH, OPT_NOCAFILE, OPT_NOCAPATH, OPT_IN, OPT_INFORM, OPT_OUT,
  45     OPT_OUTFORM, OPT_CONTENT
  46 } OPTION_CHOICE;
  47
  48 const OPTIONS smime_options[] = {
  49     {OPT_HELP_STR, 1, '-', "Usage: %s [options] cert.pem...\n"},
  50     {OPT_HELP_STR, 1, '-',
  51         "  cert.pem... recipient certs for encryption\n"},
  52     {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
  53     {"help", OPT_HELP, '-', "Display this summary"},
  54     {"encrypt", OPT_ENCRYPT, '-', "Encrypt message"},
  55     {"decrypt", OPT_DECRYPT, '-', "Decrypt encrypted message"},
  56     {"sign", OPT_SIGN, '-', "Sign message"},
  57     {"verify", OPT_VERIFY, '-', "Verify signed message"},
  58     {"pk7out", OPT_PK7OUT, '-', "Output PKCS#7 structure"},
  59     {"nointern", OPT_NOINTERN, '-',
  60      "Don't search certificates in message for signer"},
  61     {"nosigs", OPT_NOSIGS, '-', "Don't verify message signature"},
  62     {"noverify", OPT_NOVERIFY, '-', "Don't verify signers certificate"},
  63     {"nocerts", OPT_NOCERTS, '-',
  64      "Don't include signers certificate when signing"},
  65     {"nodetach", OPT_NODETACH, '-', "Use opaque signing"},
  66     {"noattr", OPT_NOATTR, '-', "Don't include any signed attributes"},
  67     {"binary", OPT_BINARY, '-', "Don't translate message to text"},
  68     {"certfile", OPT_CERTFILE, '<', "Other certificates file"},
  69     {"signer", OPT_SIGNER, 's', "Signer certificate file"},
  70     {"recip", OPT_RECIP, '<', "Recipient certificate file for decryption"},
  71     {"in", OPT_IN, '<', "Input file"},
  72     {"inform", OPT_INFORM, 'c', "Input format SMIME (default), PEM or DER"},
  73     {"inkey", OPT_INKEY, 's',
  74      "Input private key (if not signer or recipient)"},
  75     {"keyform", OPT_KEYFORM, 'f', "Input private key format (PEM or ENGINE)"},
  76     {"out", OPT_OUT, '>', "Output file"},
  77     {"outform", OPT_OUTFORM, 'c',
  78      "Output format SMIME (default), PEM or DER"},
  79     {"content", OPT_CONTENT, '<',
  80      "Supply or override content for detached signature"},
  81     {"to", OPT_TO, 's', "To address"},
  82     {"from", OPT_FROM, 's', "From address"},
  83     {"subject", OPT_SUBJECT, 's', "Subject"},
  84     {"text", OPT_TEXT, '-', "Include or delete text MIME headers"},
  85     {"CApath", OPT_CAPATH, '/', "Trusted certificates directory"},
  86     {"CAfile", OPT_CAFILE, '<', "Trusted certificates file"},
  87     {"no-CAfile", OPT_NOCAFILE, '-',
  88      "Do not load the default certificates file"},
  89     {"no-CApath", OPT_NOCAPATH, '-',
  90      "Do not load certificates from the default certificates directory"},
  91     {"resign", OPT_RESIGN, '-', "Resign a signed message"},
  92     {"nochain", OPT_NOCHAIN, '-',
  93      "set PKCS7_NOCHAIN so certificates contained in the message are not used as untrusted CAs" },
  94     {"nosmimecap", OPT_NOSMIMECAP, '-', "Omit the SMIMECapabilities attribute"},
  95     {"stream", OPT_STREAM, '-', "Enable CMS streaming" },
  96     {"indef", OPT_INDEF, '-', "Same as -stream" },
  97     {"noindef", OPT_NOINDEF, '-', "Disable CMS streaming"},
  98     {"crlfeol", OPT_CRLFEOL, '-', "Use CRLF as EOL termination instead of CR only"},
  99     {"rand", OPT_RAND, 's',
 100      "Load the file(s) into the random number generator"},
 101     {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
 102     {"md", OPT_MD, 's', "Digest algorithm to use when signing or resigning"},
 103     {"", OPT_CIPHER, '-', "Any supported cipher"},
 104     OPT_V_OPTIONS,
 105 #ifndef OPENSSL_NO_ENGINE
 106     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
 107 #endif
 108     {NULL}
 109 };
 110
 111 int smime_main(int argc, char **argv)
 112 {
 113     BIO *in = NULL, *out = NULL, *indata = NULL;
 114     EVP_PKEY *key = NULL;
 115     PKCS7 *p7 = NULL;
 116     STACK_OF(OPENSSL_STRING) *sksigners = NULL, *skkeys = NULL;
 117     STACK_OF(X509) *encerts = NULL, *other = NULL;
 118     X509 *cert = NULL, *recip = NULL, *signer = NULL;
 119     X509_STORE *store = NULL;
 120     X509_VERIFY_PARAM *vpm = NULL;
 121     const EVP_CIPHER *cipher = NULL;
 122     const EVP_MD *sign_md = NULL;
 123     const char *CAfile = NULL, *CApath = NULL, *prog = NULL;
 124     char *certfile = NULL, *keyfile = NULL, *contfile = NULL, *inrand = NULL;
 125     char *infile = NULL, *outfile = NULL, *signerfile = NULL, *recipfile =
 126         NULL;
 127     char *passinarg = NULL, *passin = NULL, *to = NULL, *from =
 128         NULL, *subject = NULL;
 129     OPTION_CHOICE o;
 130     int noCApath = 0, noCAfile = 0;
 131     int flags = PKCS7_DETACHED, operation = 0, ret = 0, need_rand = 0, indef =
 132         0;
 133     int informat = FORMAT_SMIME, outformat = FORMAT_SMIME, keyform =
 134         FORMAT_PEM;
 135     int vpmtouched = 0, rv = 0;
 136     ENGINE *e = NULL;
 137     const char *mime_eol = "\n";
 138
 139     if ((vpm = X509_VERIFY_PARAM_new()) == NULL)
 140         return 1;
 141
 142     prog = opt_init(argc, argv, smime_options);
 143     while ((o = opt_next()) != OPT_EOF) {
 144         switch (o) {
 145         case OPT_EOF:
 146         case OPT_ERR:
 147  opthelp:
 148             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 149             goto end;
 150         case OPT_HELP:
 151             opt_help(smime_options);
 152             ret = 0;
 153             goto end;
 154         case OPT_INFORM:
 155             if (!opt_format(opt_arg(), OPT_FMT_PDS, &informat))
 156                 goto opthelp;
 157             break;
 158         case OPT_IN:
 159             infile = opt_arg();
 160             break;
 161         case OPT_OUTFORM:
 162             if (!opt_format(opt_arg(), OPT_FMT_PDS, &outformat))
 163                 goto opthelp;
 164             break;
 165         case OPT_OUT:
 166             outfile = opt_arg();
 167             break;
 168         case OPT_ENCRYPT:
 169             operation = SMIME_ENCRYPT;
 170             break;
 171         case OPT_DECRYPT:
 172             operation = SMIME_DECRYPT;
 173             break;
 174         case OPT_SIGN:
 175             operation = SMIME_SIGN;
 176             break;
 177         case OPT_RESIGN:
 178             operation = SMIME_RESIGN;
 179             break;
 180         case OPT_VERIFY:
 181             operation = SMIME_VERIFY;
 182             break;
 183         case OPT_PK7OUT:
 184             operation = SMIME_PK7OUT;
 185             break;
 186         case OPT_TEXT:
 187             flags |= PKCS7_TEXT;
 188             break;
 189         case OPT_NOINTERN:
 190             flags |= PKCS7_NOINTERN;
 191             break;
 192         case OPT_NOVERIFY:
 193             flags |= PKCS7_NOVERIFY;
 194             break;
 195         case OPT_NOCHAIN:
 196             flags |= PKCS7_NOCHAIN;
 197             break;
 198         case OPT_NOCERTS:
 199             flags |= PKCS7_NOCERTS;
 200             break;
 201         case OPT_NOATTR:
 202             flags |= PKCS7_NOATTR;
 203             break;
 204         case OPT_NODETACH:
 205             flags &= ~PKCS7_DETACHED;
 206             break;
 207         case OPT_NOSMIMECAP:
 208             flags |= PKCS7_NOSMIMECAP;
 209             break;
 210         case OPT_BINARY:
 211             flags |= PKCS7_BINARY;
 212             break;
 213         case OPT_NOSIGS:
 214             flags |= PKCS7_NOSIGS;
 215             break;
 216         case OPT_STREAM:
 217         case OPT_INDEF:
 218             indef = 1;
 219             break;
 220         case OPT_NOINDEF:
 221             indef = 0;
 222             break;
 223         case OPT_CRLFEOL:
 224             flags |= PKCS7_CRLFEOL;
 225             mime_eol = "\r\n";
 226             break;
 227         case OPT_RAND:
 228             inrand = opt_arg();
 229             need_rand = 1;
 230             break;
 231         case OPT_ENGINE:
 232             e = setup_engine(opt_arg(), 0);
 233             break;
 234         case OPT_PASSIN:
 235             passinarg = opt_arg();
 236             break;
 237         case OPT_TO:
 238             to = opt_arg();
 239             break;
 240         case OPT_FROM:
 241             from = opt_arg();
 242             break;
 243         case OPT_SUBJECT:
 244             subject = opt_arg();
 245             break;
 246         case OPT_SIGNER:
 247             /* If previous -signer argument add signer to list */
 248             if (signerfile != NULL) {
 249                 if (sksigners == NULL
 250                     && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
 251                     goto end;
 252                 sk_OPENSSL_STRING_push(sksigners, signerfile);
 253                 if (keyfile == NULL)
 254                     keyfile = signerfile;
 255                 if (skkeys == NULL
 256                     && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
 257                     goto end;
 258                 sk_OPENSSL_STRING_push(skkeys, keyfile);
 259                 keyfile = NULL;
 260             }
 261             signerfile = opt_arg();
 262             break;
 263         case OPT_RECIP:
 264             recipfile = opt_arg();
 265             break;
 266         case OPT_MD:
 267             if (!opt_md(opt_arg(), &sign_md))
 268                 goto opthelp;
 269             break;
 270         case OPT_CIPHER:
 271             if (!opt_cipher(opt_unknown(), &cipher))
 272                 goto opthelp;
 273             break;
 274         case OPT_INKEY:
 275             /* If previous -inkey argument add signer to list */
 276             if (keyfile != NULL) {
 277                 if (signerfile == NULL) {
 278                     BIO_printf(bio_err,
 279                                "%s: Must have -signer before -inkey\n", prog);
 280                     goto opthelp;
 281                 }
 282                 if (sksigners == NULL
 283                     && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
 284                     goto end;
 285                 sk_OPENSSL_STRING_push(sksigners, signerfile);
 286                 signerfile = NULL;
 287                 if (skkeys == NULL
 288                     && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
 289                     goto end;
 290                 sk_OPENSSL_STRING_push(skkeys, keyfile);
 291             }
 292             keyfile = opt_arg();
 293             break;
 294         case OPT_KEYFORM:
 295             if (!opt_format(opt_arg(), OPT_FMT_ANY, &keyform))
 296                 goto opthelp;
 297             break;
 298         case OPT_CERTFILE:
 299             certfile = opt_arg();
 300             break;
 301         case OPT_CAFILE:
 302             CAfile = opt_arg();
 303             break;
 304         case OPT_CAPATH:
 305             CApath = opt_arg();
 306             break;
 307         case OPT_NOCAFILE:
 308             noCAfile = 1;
 309             break;
 310         case OPT_NOCAPATH:
 311             noCApath = 1;
 312             break;
 313         case OPT_CONTENT:
 314             contfile = opt_arg();
 315             break;
 316         case OPT_V_CASES:
 317             if (!opt_verify(o, vpm))
 318                 goto opthelp;
 319             vpmtouched++;
 320             break;
 321         }
 322     }
 323     argc = opt_num_rest();
 324     argv = opt_rest();
 325
 326     if (!(operation & SMIME_SIGNERS) && (skkeys != NULL || sksigners != NULL)) {
 327         BIO_puts(bio_err, "Multiple signers or keys not allowed\n");
 328         goto opthelp;
 329     }
 330
 331     if (operation & SMIME_SIGNERS) {
 332         /* Check to see if any final signer needs to be appended */
 333         if (keyfile && !signerfile) {
 334             BIO_puts(bio_err, "Illegal -inkey without -signer\n");
 335             goto opthelp;
 336         }
 337         if (signerfile != NULL) {
 338             if (sksigners == NULL
 339                 && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
 340                 goto end;
 341             sk_OPENSSL_STRING_push(sksigners, signerfile);
 342             if (!skkeys && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
 343                 goto end;
 344             if (!keyfile)
 345                 keyfile = signerfile;
 346             sk_OPENSSL_STRING_push(skkeys, keyfile);
 347         }
 348         if (sksigners == NULL) {
 349             BIO_printf(bio_err, "No signer certificate specified\n");
 350             goto opthelp;
 351         }
 352         signerfile = NULL;
 353         keyfile = NULL;
 354         need_rand = 1;
 355     } else if (operation == SMIME_DECRYPT) {
 356         if (recipfile == NULL && keyfile == NULL) {
 357             BIO_printf(bio_err,
 358                        "No recipient certificate or key specified\n");
 359             goto opthelp;
 360         }
 361     } else if (operation == SMIME_ENCRYPT) {
 362         if (argc == 0) {
 363             BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
 364             goto opthelp;
 365         }
 366         need_rand = 1;
 367     } else if (!operation) {
 368         goto opthelp;
 369     }
 370
 371     if (!app_passwd(passinarg, NULL, &passin, NULL)) {
 372         BIO_printf(bio_err, "Error getting password\n");
 373         goto end;
 374     }
 375
 376     if (need_rand) {
 377         app_RAND_load_file(NULL, (inrand != NULL));
 378         if (inrand != NULL)
 379             BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
 380                        app_RAND_load_files(inrand));
 381     }
 382
 383     ret = 2;
 384
 385     if (!(operation & SMIME_SIGNERS))
 386         flags &= ~PKCS7_DETACHED;
 387
 388     if (!(operation & SMIME_OP)) {
 389         if (flags & PKCS7_BINARY)
 390             outformat = FORMAT_BINARY;
 391     }
 392
 393     if (!(operation & SMIME_IP)) {
 394         if (flags & PKCS7_BINARY)
 395             informat = FORMAT_BINARY;
 396     }
 397
 398     if (operation == SMIME_ENCRYPT) {
 399         if (cipher == NULL) {
 400 #ifndef OPENSSL_NO_DES
 401             cipher = EVP_des_ede3_cbc();
 402 #else
 403             BIO_printf(bio_err, "No cipher selected\n");
 404             goto end;
 405 #endif
 406         }
 407         encerts = sk_X509_new_null();
 408         if (encerts == NULL)
 409             goto end;
 410         while (*argv != NULL) {
 411             cert = load_cert(*argv, FORMAT_PEM,
 412                              "recipient certificate file");
 413             if (cert == NULL)
 414                 goto end;
 415             sk_X509_push(encerts, cert);
 416             cert = NULL;
 417             argv++;
 418         }
 419     }
 420
 421     if (certfile != NULL) {
 422         if (!load_certs(certfile, &other, FORMAT_PEM, NULL,
 423                         "certificate file")) {
 424             ERR_print_errors(bio_err);
 425             goto end;
 426         }
 427     }
 428
 429     if (recipfile != NULL && (operation == SMIME_DECRYPT)) {
 430         if ((recip = load_cert(recipfile, FORMAT_PEM,
 431                                "recipient certificate file")) == NULL) {
 432             ERR_print_errors(bio_err);
 433             goto end;
 434         }
 435     }
 436
 437     if (operation == SMIME_DECRYPT) {
 438         if (keyfile == NULL)
 439             keyfile = recipfile;
 440     } else if (operation == SMIME_SIGN) {
 441         if (keyfile == NULL)
 442             keyfile = signerfile;
 443     } else {
 444         keyfile = NULL;
 445     }
 446
 447     if (keyfile != NULL) {
 448         key = load_key(keyfile, keyform, 0, passin, e, "signing key file");
 449         if (key == NULL)
 450             goto end;
 451     }
 452
 453     in = bio_open_default(infile, 'r', informat);
 454     if (in == NULL)
 455         goto end;
 456
 457     if (operation & SMIME_IP) {
 458         if (informat == FORMAT_SMIME) {
 459             p7 = SMIME_read_PKCS7(in, &indata);
 460         } else if (informat == FORMAT_PEM) {
 461             p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
 462         } else if (informat == FORMAT_ASN1) {
 463             p7 = d2i_PKCS7_bio(in, NULL);
 464         } else {
 465             BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
 466             goto end;
 467         }
 468
 469         if (p7 == NULL) {
 470             BIO_printf(bio_err, "Error reading S/MIME message\n");
 471             goto end;
 472         }
 473         if (contfile != NULL) {
 474             BIO_free(indata);
 475             if ((indata = BIO_new_file(contfile, "rb")) == NULL) {
 476                 BIO_printf(bio_err, "Can't read content file %s\n", contfile);
 477                 goto end;
 478             }
 479         }
 480     }
 481
 482     out = bio_open_default(outfile, 'w', outformat);
 483     if (out == NULL)
 484         goto end;
 485
 486     if (operation == SMIME_VERIFY) {
 487         if ((store = setup_verify(CAfile, CApath, noCAfile, noCApath)) == NULL)
 488             goto end;
 489         X509_STORE_set_verify_cb(store, smime_cb);
 490         if (vpmtouched)
 491             X509_STORE_set1_param(store, vpm);
 492     }
 493
 494     ret = 3;
 495
 496     if (operation == SMIME_ENCRYPT) {
 497         if (indef)
 498             flags |= PKCS7_STREAM;
 499         p7 = PKCS7_encrypt(encerts, in, cipher, flags);
 500     } else if (operation & SMIME_SIGNERS) {
 501         int i;
 502         /*
 503          * If detached data content we only enable streaming if S/MIME output
 504          * format.
 505          */
 506         if (operation == SMIME_SIGN) {
 507             if (flags & PKCS7_DETACHED) {
 508                 if (outformat == FORMAT_SMIME)
 509                     flags |= PKCS7_STREAM;
 510             } else if (indef) {
 511                 flags |= PKCS7_STREAM;
 512             }
 513             flags |= PKCS7_PARTIAL;
 514             p7 = PKCS7_sign(NULL, NULL, other, in, flags);
 515             if (p7 == NULL)
 516                 goto end;
 517             if (flags & PKCS7_NOCERTS) {
 518                 for (i = 0; i < sk_X509_num(other); i++) {
 519                     X509 *x = sk_X509_value(other, i);
 520                     PKCS7_add_certificate(p7, x);
 521                 }
 522             }
 523         } else {
 524             flags |= PKCS7_REUSE_DIGEST;
 525         }
 526         for (i = 0; i < sk_OPENSSL_STRING_num(sksigners); i++) {
 527             signerfile = sk_OPENSSL_STRING_value(sksigners, i);
 528             keyfile = sk_OPENSSL_STRING_value(skkeys, i);
 529             signer = load_cert(signerfile, FORMAT_PEM,
 530                                "signer certificate");
 531             if (signer == NULL)
 532                 goto end;
 533             key = load_key(keyfile, keyform, 0, passin, e, "signing key file");
 534             if (key == NULL)
 535                 goto end;
 536             if (!PKCS7_sign_add_signer(p7, signer, key, sign_md, flags))
 537                 goto end;
 538             X509_free(signer);
 539             signer = NULL;
 540             EVP_PKEY_free(key);
 541             key = NULL;
 542         }
 543         /* If not streaming or resigning finalize structure */
 544         if ((operation == SMIME_SIGN) && !(flags & PKCS7_STREAM)) {
 545             if (!PKCS7_final(p7, in, flags))
 546                 goto end;
 547         }
 548     }
 549
 550     if (p7 == NULL) {
 551         BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
 552         goto end;
 553     }
 554
 555     ret = 4;
 556     if (operation == SMIME_DECRYPT) {
 557         if (!PKCS7_decrypt(p7, key, recip, out, flags)) {
 558             BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
 559             goto end;
 560         }
 561     } else if (operation == SMIME_VERIFY) {
 562         STACK_OF(X509) *signers;
 563         if (PKCS7_verify(p7, other, store, indata, out, flags))
 564             BIO_printf(bio_err, "Verification successful\n");
 565         else {
 566             BIO_printf(bio_err, "Verification failure\n");
 567             goto end;
 568         }
 569         signers = PKCS7_get0_signers(p7, other, flags);
 570         if (!save_certs(signerfile, signers)) {
 571             BIO_printf(bio_err, "Error writing signers to %s\n", signerfile);
 572             ret = 5;
 573             goto end;
 574         }
 575         sk_X509_free(signers);
 576     } else if (operation == SMIME_PK7OUT) {
 577         PEM_write_bio_PKCS7(out, p7);
 578     } else {
 579         if (to)
 580             BIO_printf(out, "To: %s%s", to, mime_eol);
 581         if (from)
 582             BIO_printf(out, "From: %s%s", from, mime_eol);
 583         if (subject)
 584             BIO_printf(out, "Subject: %s%s", subject, mime_eol);
 585         if (outformat == FORMAT_SMIME) {
 586             if (operation == SMIME_RESIGN)
 587                 rv = SMIME_write_PKCS7(out, p7, indata, flags);
 588             else
 589                 rv = SMIME_write_PKCS7(out, p7, in, flags);
 590         } else if (outformat == FORMAT_PEM) {
 591             rv = PEM_write_bio_PKCS7_stream(out, p7, in, flags);
 592         } else if (outformat == FORMAT_ASN1) {
 593             rv = i2d_PKCS7_bio_stream(out, p7, in, flags);
 594         } else {
 595             BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
 596             goto end;
 597         }
 598         if (rv == 0) {
 599             BIO_printf(bio_err, "Error writing output\n");
 600             ret = 3;
 601             goto end;
 602         }
 603     }
 604     ret = 0;
 605  end:
 606     if (need_rand)
 607         app_RAND_write_file(NULL);
 608     if (ret)
 609         ERR_print_errors(bio_err);
 610     sk_X509_pop_free(encerts, X509_free);
 611     sk_X509_pop_free(other, X509_free);
 612     X509_VERIFY_PARAM_free(vpm);
 613     sk_OPENSSL_STRING_free(sksigners);
 614     sk_OPENSSL_STRING_free(skkeys);
 615     X509_STORE_free(store);
 616     X509_free(cert);
 617     X509_free(recip);
 618     X509_free(signer);
 619     EVP_PKEY_free(key);
 620     PKCS7_free(p7);
 621     release_engine(e);
 622     BIO_free(in);
 623     BIO_free(indata);
 624     BIO_free_all(out);
 625     OPENSSL_free(passin);
 626     return (ret);
 627 }
 628
 629 static int save_certs(char *signerfile, STACK_OF(X509) *signers)
 630 {
 631     int i;
 632     BIO *tmp;
 633
 634     if (signerfile == NULL)
 635         return 1;
 636     tmp = BIO_new_file(signerfile, "w");
 637     if (tmp == NULL)
 638         return 0;
 639     for (i = 0; i < sk_X509_num(signers); i++)
 640         PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
 641     BIO_free(tmp);
 642     return 1;
 643 }
 644
 645 /* Minimal callback just to output policy info (if any) */
 646
 647 static int smime_cb(int ok, X509_STORE_CTX *ctx)
 648 {
 649     int error;
 650
 651     error = X509_STORE_CTX_get_error(ctx);
 652
 653     if ((error != X509_V_ERR_NO_EXPLICIT_POLICY)
 654         && ((error != X509_V_OK) || (ok != 2)))
 655         return ok;
 656
 657     policies_print(ctx);
 658
 659     return ok;
 660 }