apps/smime.c

   1 /*
   2  * Copyright 1999-2018 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 "progs.h"
  16 #include <openssl/crypto.h>
  17 #include <openssl/pem.h>
  18 #include <openssl/err.h>
  19 #include <openssl/x509_vfy.h>
  20 #include <openssl/x509v3.h>
  21
  22 static int save_certs(char *signerfile, STACK_OF(X509) *signers);
  23 static int smime_cb(int ok, X509_STORE_CTX *ctx);
  24
  25 #define SMIME_OP        0x10
  26 #define SMIME_IP        0x20
  27 #define SMIME_SIGNERS   0x40
  28 #define SMIME_ENCRYPT   (1 | SMIME_OP)
  29 #define SMIME_DECRYPT   (2 | SMIME_IP)
  30 #define SMIME_SIGN      (3 | SMIME_OP | SMIME_SIGNERS)
  31 #define SMIME_VERIFY    (4 | SMIME_IP)
  32 #define SMIME_PK7OUT    (5 | SMIME_IP | SMIME_OP)
  33 #define SMIME_RESIGN    (6 | SMIME_IP | SMIME_OP | SMIME_SIGNERS)
  34
  35 typedef enum OPTION_choice {
  36     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  37     OPT_ENCRYPT, OPT_DECRYPT, OPT_SIGN, OPT_RESIGN, OPT_VERIFY,
  38     OPT_PK7OUT, OPT_TEXT, OPT_NOINTERN, OPT_NOVERIFY, OPT_NOCHAIN,
  39     OPT_NOCERTS, OPT_NOATTR, OPT_NODETACH, OPT_NOSMIMECAP,
  40     OPT_BINARY, OPT_NOSIGS, OPT_STREAM, OPT_INDEF, OPT_NOINDEF,
  41     OPT_CRLFEOL, OPT_ENGINE, OPT_PASSIN,
  42     OPT_TO, OPT_FROM, OPT_SUBJECT, OPT_SIGNER, OPT_RECIP, OPT_MD,
  43     OPT_CIPHER, OPT_INKEY, OPT_KEYFORM, OPT_CERTFILE, OPT_CAFILE,
  44     OPT_R_ENUM,
  45     OPT_V_ENUM,
  46     OPT_CAPATH, OPT_NOCAFILE, OPT_NOCAPATH, OPT_IN, OPT_INFORM, OPT_OUT,
  47     OPT_OUTFORM, OPT_CONTENT
  48 } OPTION_CHOICE;
  49
  50 const OPTIONS smime_options[] = {
  51     {OPT_HELP_STR, 1, '-', "Usage: %s [options] cert.pem...\n"},
  52     {OPT_HELP_STR, 1, '-',
  53         "  cert.pem... recipient certs for encryption\n"},
  54     {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
  55     {"help", OPT_HELP, '-', "Display this summary"},
  56     {"encrypt", OPT_ENCRYPT, '-', "Encrypt message"},
  57     {"decrypt", OPT_DECRYPT, '-', "Decrypt encrypted message"},
  58     {"sign", OPT_SIGN, '-', "Sign message"},
  59     {"verify", OPT_VERIFY, '-', "Verify signed message"},
  60     {"pk7out", OPT_PK7OUT, '-', "Output PKCS#7 structure"},
  61     {"nointern", OPT_NOINTERN, '-',
  62      "Don't search certificates in message for signer"},
  63     {"nosigs", OPT_NOSIGS, '-', "Don't verify message signature"},
  64     {"noverify", OPT_NOVERIFY, '-', "Don't verify signers certificate"},
  65     {"nocerts", OPT_NOCERTS, '-',
  66      "Don't include signers certificate when signing"},
  67     {"nodetach", OPT_NODETACH, '-', "Use opaque signing"},
  68     {"noattr", OPT_NOATTR, '-', "Don't include any signed attributes"},
  69     {"binary", OPT_BINARY, '-', "Don't translate message to text"},
  70     {"certfile", OPT_CERTFILE, '<', "Other certificates file"},
  71     {"signer", OPT_SIGNER, 's', "Signer certificate file"},
  72     {"recip", OPT_RECIP, '<', "Recipient certificate file for decryption"},
  73     {"in", OPT_IN, '<', "Input file"},
  74     {"inform", OPT_INFORM, 'c', "Input format SMIME (default), PEM or DER"},
  75     {"inkey", OPT_INKEY, 's',
  76      "Input private key (if not signer or recipient)"},
  77     {"keyform", OPT_KEYFORM, 'f', "Input private key format (PEM or ENGINE)"},
  78     {"out", OPT_OUT, '>', "Output file"},
  79     {"outform", OPT_OUTFORM, 'c',
  80      "Output format SMIME (default), PEM or DER"},
  81     {"content", OPT_CONTENT, '<',
  82      "Supply or override content for detached signature"},
  83     {"to", OPT_TO, 's', "To address"},
  84     {"from", OPT_FROM, 's', "From address"},
  85     {"subject", OPT_SUBJECT, 's', "Subject"},
  86     {"text", OPT_TEXT, '-', "Include or delete text MIME headers"},
  87     {"CApath", OPT_CAPATH, '/', "Trusted certificates directory"},
  88     {"CAfile", OPT_CAFILE, '<', "Trusted certificates file"},
  89     {"no-CAfile", OPT_NOCAFILE, '-',
  90      "Do not load the default certificates file"},
  91     {"no-CApath", OPT_NOCAPATH, '-',
  92      "Do not load certificates from the default certificates directory"},
  93     {"resign", OPT_RESIGN, '-', "Resign a signed message"},
  94     {"nochain", OPT_NOCHAIN, '-',
  95      "set PKCS7_NOCHAIN so certificates contained in the message are not used as untrusted CAs" },
  96     {"nosmimecap", OPT_NOSMIMECAP, '-', "Omit the SMIMECapabilities attribute"},
  97     {"stream", OPT_STREAM, '-', "Enable CMS streaming" },
  98     {"indef", OPT_INDEF, '-', "Same as -stream" },
  99     {"noindef", OPT_NOINDEF, '-', "Disable CMS streaming"},
 100     {"crlfeol", OPT_CRLFEOL, '-', "Use CRLF as EOL termination instead of CR only"},
 101     OPT_R_OPTIONS,
 102     {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
 103     {"md", OPT_MD, 's', "Digest algorithm to use when signing or resigning"},
 104     {"", OPT_CIPHER, '-', "Any supported cipher"},
 105     OPT_V_OPTIONS,
 106 #ifndef OPENSSL_NO_ENGINE
 107     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
 108 #endif
 109     {NULL}
 110 };
 111
 112 int smime_main(int argc, char **argv)
 113 {
 114     BIO *in = NULL, *out = NULL, *indata = NULL;
 115     EVP_PKEY *key = NULL;
 116     PKCS7 *p7 = NULL;
 117     STACK_OF(OPENSSL_STRING) *sksigners = NULL, *skkeys = NULL;
 118     STACK_OF(X509) *encerts = NULL, *other = NULL;
 119     X509 *cert = NULL, *recip = NULL, *signer = NULL;
 120     X509_STORE *store = NULL;
 121     X509_VERIFY_PARAM *vpm = NULL;
 122     const EVP_CIPHER *cipher = NULL;
 123     const EVP_MD *sign_md = NULL;
 124     const char *CAfile = NULL, *CApath = NULL, *prog = NULL;
 125     char *certfile = NULL, *keyfile = NULL, *contfile = NULL;
 126     char *infile = NULL, *outfile = NULL, *signerfile = NULL, *recipfile = NULL;
 127     char *passinarg = NULL, *passin = NULL, *to = NULL, *from = NULL, *subject = NULL;
 128     OPTION_CHOICE o;
 129     int noCApath = 0, noCAfile = 0;
 130     int flags = PKCS7_DETACHED, operation = 0, ret = 0, indef = 0;
 131     int informat = FORMAT_SMIME, outformat = FORMAT_SMIME, keyform =
 132         FORMAT_PEM;
 133     int vpmtouched = 0, rv = 0;
 134     ENGINE *e = NULL;
 135     const char *mime_eol = "\n";
 136
 137     if ((vpm = X509_VERIFY_PARAM_new()) == NULL)
 138         return 1;
 139
 140     prog = opt_init(argc, argv, smime_options);
 141     while ((o = opt_next()) != OPT_EOF) {
 142         switch (o) {
 143         case OPT_EOF:
 144         case OPT_ERR:
 145  opthelp:
 146             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 147             goto end;
 148         case OPT_HELP:
 149             opt_help(smime_options);
 150             ret = 0;
 151             goto end;
 152         case OPT_INFORM:
 153             if (!opt_format(opt_arg(), OPT_FMT_PDS, &informat))
 154                 goto opthelp;
 155             break;
 156         case OPT_IN:
 157             infile = opt_arg();
 158             break;
 159         case OPT_OUTFORM:
 160             if (!opt_format(opt_arg(), OPT_FMT_PDS, &outformat))
 161                 goto opthelp;
 162             break;
 163         case OPT_OUT:
 164             outfile = opt_arg();
 165             break;
 166         case OPT_ENCRYPT:
 167             operation = SMIME_ENCRYPT;
 168             break;
 169         case OPT_DECRYPT:
 170             operation = SMIME_DECRYPT;
 171             break;
 172         case OPT_SIGN:
 173             operation = SMIME_SIGN;
 174             break;
 175         case OPT_RESIGN:
 176             operation = SMIME_RESIGN;
 177             break;
 178         case OPT_VERIFY:
 179             operation = SMIME_VERIFY;
 180             break;
 181         case OPT_PK7OUT:
 182             operation = SMIME_PK7OUT;
 183             break;
 184         case OPT_TEXT:
 185             flags |= PKCS7_TEXT;
 186             break;
 187         case OPT_NOINTERN:
 188             flags |= PKCS7_NOINTERN;
 189             break;
 190         case OPT_NOVERIFY:
 191             flags |= PKCS7_NOVERIFY;
 192             break;
 193         case OPT_NOCHAIN:
 194             flags |= PKCS7_NOCHAIN;
 195             break;
 196         case OPT_NOCERTS:
 197             flags |= PKCS7_NOCERTS;
 198             break;
 199         case OPT_NOATTR:
 200             flags |= PKCS7_NOATTR;
 201             break;
 202         case OPT_NODETACH:
 203             flags &= ~PKCS7_DETACHED;
 204             break;
 205         case OPT_NOSMIMECAP:
 206             flags |= PKCS7_NOSMIMECAP;
 207             break;
 208         case OPT_BINARY:
 209             flags |= PKCS7_BINARY;
 210             break;
 211         case OPT_NOSIGS:
 212             flags |= PKCS7_NOSIGS;
 213             break;
 214         case OPT_STREAM:
 215         case OPT_INDEF:
 216             indef = 1;
 217             break;
 218         case OPT_NOINDEF:
 219             indef = 0;
 220             break;
 221         case OPT_CRLFEOL:
 222             flags |= PKCS7_CRLFEOL;
 223             mime_eol = "\r\n";
 224             break;
 225         case OPT_R_CASES:
 226             if (!opt_rand(o))
 227                 goto end;
 228             break;
 229         case OPT_ENGINE:
 230             e = setup_engine(opt_arg(), 0);
 231             break;
 232         case OPT_PASSIN:
 233             passinarg = opt_arg();
 234             break;
 235         case OPT_TO:
 236             to = opt_arg();
 237             break;
 238         case OPT_FROM:
 239             from = opt_arg();
 240             break;
 241         case OPT_SUBJECT:
 242             subject = opt_arg();
 243             break;
 244         case OPT_SIGNER:
 245             /* If previous -signer argument add signer to list */
 246             if (signerfile != NULL) {
 247                 if (sksigners == NULL
 248                     && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
 249                     goto end;
 250                 sk_OPENSSL_STRING_push(sksigners, signerfile);
 251                 if (keyfile == NULL)
 252                     keyfile = signerfile;
 253                 if (skkeys == NULL
 254                     && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
 255                     goto end;
 256                 sk_OPENSSL_STRING_push(skkeys, keyfile);
 257                 keyfile = NULL;
 258             }
 259             signerfile = opt_arg();
 260             break;
 261         case OPT_RECIP:
 262             recipfile = opt_arg();
 263             break;
 264         case OPT_MD:
 265             if (!opt_md(opt_arg(), &sign_md))
 266                 goto opthelp;
 267             break;
 268         case OPT_CIPHER:
 269             if (!opt_cipher(opt_unknown(), &cipher))
 270                 goto opthelp;
 271             break;
 272         case OPT_INKEY:
 273             /* If previous -inkey argument add signer to list */
 274             if (keyfile != NULL) {
 275                 if (signerfile == NULL) {
 276                     BIO_printf(bio_err,
 277                                "%s: Must have -signer before -inkey\n", prog);
 278                     goto opthelp;
 279                 }
 280                 if (sksigners == NULL
 281                     && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
 282                     goto end;
 283                 sk_OPENSSL_STRING_push(sksigners, signerfile);
 284                 signerfile = NULL;
 285                 if (skkeys == NULL
 286                     && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
 287                     goto end;
 288                 sk_OPENSSL_STRING_push(skkeys, keyfile);
 289             }
 290             keyfile = opt_arg();
 291             break;
 292         case OPT_KEYFORM:
 293             if (!opt_format(opt_arg(), OPT_FMT_ANY, &keyform))
 294                 goto opthelp;
 295             break;
 296         case OPT_CERTFILE:
 297             certfile = opt_arg();
 298             break;
 299         case OPT_CAFILE:
 300             CAfile = opt_arg();
 301             break;
 302         case OPT_CAPATH:
 303             CApath = opt_arg();
 304             break;
 305         case OPT_NOCAFILE:
 306             noCAfile = 1;
 307             break;
 308         case OPT_NOCAPATH:
 309             noCApath = 1;
 310             break;
 311         case OPT_CONTENT:
 312             contfile = opt_arg();
 313             break;
 314         case OPT_V_CASES:
 315             if (!opt_verify(o, vpm))
 316                 goto opthelp;
 317             vpmtouched++;
 318             break;
 319         }
 320     }
 321     argc = opt_num_rest();
 322     argv = opt_rest();
 323
 324     if (!(operation & SMIME_SIGNERS) && (skkeys != NULL || sksigners != NULL)) {
 325         BIO_puts(bio_err, "Multiple signers or keys not allowed\n");
 326         goto opthelp;
 327     }
 328
 329     if (operation & SMIME_SIGNERS) {
 330         /* Check to see if any final signer needs to be appended */
 331         if (keyfile && !signerfile) {
 332             BIO_puts(bio_err, "Illegal -inkey without -signer\n");
 333             goto opthelp;
 334         }
 335         if (signerfile != NULL) {
 336             if (sksigners == NULL
 337                 && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
 338                 goto end;
 339             sk_OPENSSL_STRING_push(sksigners, signerfile);
 340             if (!skkeys && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
 341                 goto end;
 342             if (!keyfile)
 343                 keyfile = signerfile;
 344             sk_OPENSSL_STRING_push(skkeys, keyfile);
 345         }
 346         if (sksigners == NULL) {
 347             BIO_printf(bio_err, "No signer certificate specified\n");
 348             goto opthelp;
 349         }
 350         signerfile = NULL;
 351         keyfile = NULL;
 352     } else if (operation == SMIME_DECRYPT) {
 353         if (recipfile == NULL && keyfile == NULL) {
 354             BIO_printf(bio_err,
 355                        "No recipient certificate or key specified\n");
 356             goto opthelp;
 357         }
 358     } else if (operation == SMIME_ENCRYPT) {
 359         if (argc == 0) {
 360             BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
 361             goto opthelp;
 362         }
 363     } else if (!operation) {
 364         goto opthelp;
 365     }
 366
 367     if (!app_passwd(passinarg, NULL, &passin, NULL)) {
 368         BIO_printf(bio_err, "Error getting password\n");
 369         goto end;
 370     }
 371
 372     ret = 2;
 373
 374     if (!(operation & SMIME_SIGNERS))
 375         flags &= ~PKCS7_DETACHED;
 376
 377     if (!(operation & SMIME_OP)) {
 378         if (flags & PKCS7_BINARY)
 379             outformat = FORMAT_BINARY;
 380     }
 381
 382     if (!(operation & SMIME_IP)) {
 383         if (flags & PKCS7_BINARY)
 384             informat = FORMAT_BINARY;
 385     }
 386
 387     if (operation == SMIME_ENCRYPT) {
 388         if (cipher == NULL) {
 389 #ifndef OPENSSL_NO_DES
 390             cipher = EVP_des_ede3_cbc();
 391 #else
 392             BIO_printf(bio_err, "No cipher selected\n");
 393             goto end;
 394 #endif
 395         }
 396         encerts = sk_X509_new_null();
 397         if (encerts == NULL)
 398             goto end;
 399         while (*argv != NULL) {
 400             cert = load_cert(*argv, FORMAT_PEM,
 401                              "recipient certificate file");
 402             if (cert == NULL)
 403                 goto end;
 404             sk_X509_push(encerts, cert);
 405             cert = NULL;
 406             argv++;
 407         }
 408     }
 409
 410     if (certfile != NULL) {
 411         if (!load_certs(certfile, &other, FORMAT_PEM, NULL,
 412                         "certificate file")) {
 413             ERR_print_errors(bio_err);
 414             goto end;
 415         }
 416     }
 417
 418     if (recipfile != NULL && (operation == SMIME_DECRYPT)) {
 419         if ((recip = load_cert(recipfile, FORMAT_PEM,
 420                                "recipient certificate file")) == NULL) {
 421             ERR_print_errors(bio_err);
 422             goto end;
 423         }
 424     }
 425
 426     if (operation == SMIME_DECRYPT) {
 427         if (keyfile == NULL)
 428             keyfile = recipfile;
 429     } else if (operation == SMIME_SIGN) {
 430         if (keyfile == NULL)
 431             keyfile = signerfile;
 432     } else {
 433         keyfile = NULL;
 434     }
 435
 436     if (keyfile != NULL) {
 437         key = load_key(keyfile, keyform, 0, passin, e, "signing key file");
 438         if (key == NULL)
 439             goto end;
 440     }
 441
 442     in = bio_open_default(infile, 'r', informat);
 443     if (in == NULL)
 444         goto end;
 445
 446     if (operation & SMIME_IP) {
 447         if (informat == FORMAT_SMIME) {
 448             p7 = SMIME_read_PKCS7(in, &indata);
 449         } else if (informat == FORMAT_PEM) {
 450             p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
 451         } else if (informat == FORMAT_ASN1) {
 452             p7 = d2i_PKCS7_bio(in, NULL);
 453         } else {
 454             BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
 455             goto end;
 456         }
 457
 458         if (p7 == NULL) {
 459             BIO_printf(bio_err, "Error reading S/MIME message\n");
 460             goto end;
 461         }
 462         if (contfile != NULL) {
 463             BIO_free(indata);
 464             if ((indata = BIO_new_file(contfile, "rb")) == NULL) {
 465                 BIO_printf(bio_err, "Can't read content file %s\n", contfile);
 466                 goto end;
 467             }
 468         }
 469     }
 470
 471     out = bio_open_default(outfile, 'w', outformat);
 472     if (out == NULL)
 473         goto end;
 474
 475     if (operation == SMIME_VERIFY) {
 476         if ((store = setup_verify(CAfile, CApath, noCAfile, noCApath)) == NULL)
 477             goto end;
 478         X509_STORE_set_verify_cb(store, smime_cb);
 479         if (vpmtouched)
 480             X509_STORE_set1_param(store, vpm);
 481     }
 482
 483     ret = 3;
 484
 485     if (operation == SMIME_ENCRYPT) {
 486         if (indef)
 487             flags |= PKCS7_STREAM;
 488         p7 = PKCS7_encrypt(encerts, in, cipher, flags);
 489     } else if (operation & SMIME_SIGNERS) {
 490         int i;
 491         /*
 492          * If detached data content we only enable streaming if S/MIME output
 493          * format.
 494          */
 495         if (operation == SMIME_SIGN) {
 496             if (flags & PKCS7_DETACHED) {
 497                 if (outformat == FORMAT_SMIME)
 498                     flags |= PKCS7_STREAM;
 499             } else if (indef) {
 500                 flags |= PKCS7_STREAM;
 501             }
 502             flags |= PKCS7_PARTIAL;
 503             p7 = PKCS7_sign(NULL, NULL, other, in, flags);
 504             if (p7 == NULL)
 505                 goto end;
 506             if (flags & PKCS7_NOCERTS) {
 507                 for (i = 0; i < sk_X509_num(other); i++) {
 508                     X509 *x = sk_X509_value(other, i);
 509                     PKCS7_add_certificate(p7, x);
 510                 }
 511             }
 512         } else {
 513             flags |= PKCS7_REUSE_DIGEST;
 514         }
 515         for (i = 0; i < sk_OPENSSL_STRING_num(sksigners); i++) {
 516             signerfile = sk_OPENSSL_STRING_value(sksigners, i);
 517             keyfile = sk_OPENSSL_STRING_value(skkeys, i);
 518             signer = load_cert(signerfile, FORMAT_PEM,
 519                                "signer certificate");
 520             if (signer == NULL)
 521                 goto end;
 522             key = load_key(keyfile, keyform, 0, passin, e, "signing key file");
 523             if (key == NULL)
 524                 goto end;
 525             if (!PKCS7_sign_add_signer(p7, signer, key, sign_md, flags))
 526                 goto end;
 527             X509_free(signer);
 528             signer = NULL;
 529             EVP_PKEY_free(key);
 530             key = NULL;
 531         }
 532         /* If not streaming or resigning finalize structure */
 533         if ((operation == SMIME_SIGN) && !(flags & PKCS7_STREAM)) {
 534             if (!PKCS7_final(p7, in, flags))
 535                 goto end;
 536         }
 537     }
 538
 539     if (p7 == NULL) {
 540         BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
 541         goto end;
 542     }
 543
 544     ret = 4;
 545     if (operation == SMIME_DECRYPT) {
 546         if (!PKCS7_decrypt(p7, key, recip, out, flags)) {
 547             BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
 548             goto end;
 549         }
 550     } else if (operation == SMIME_VERIFY) {
 551         STACK_OF(X509) *signers;
 552         if (PKCS7_verify(p7, other, store, indata, out, flags))
 553             BIO_printf(bio_err, "Verification successful\n");
 554         else {
 555             BIO_printf(bio_err, "Verification failure\n");
 556             goto end;
 557         }
 558         signers = PKCS7_get0_signers(p7, other, flags);
 559         if (!save_certs(signerfile, signers)) {
 560             BIO_printf(bio_err, "Error writing signers to %s\n", signerfile);
 561             ret = 5;
 562             goto end;
 563         }
 564         sk_X509_free(signers);
 565     } else if (operation == SMIME_PK7OUT) {
 566         PEM_write_bio_PKCS7(out, p7);
 567     } else {
 568         if (to)
 569             BIO_printf(out, "To: %s%s", to, mime_eol);
 570         if (from)
 571             BIO_printf(out, "From: %s%s", from, mime_eol);
 572         if (subject)
 573             BIO_printf(out, "Subject: %s%s", subject, mime_eol);
 574         if (outformat == FORMAT_SMIME) {
 575             if (operation == SMIME_RESIGN)
 576                 rv = SMIME_write_PKCS7(out, p7, indata, flags);
 577             else
 578                 rv = SMIME_write_PKCS7(out, p7, in, flags);
 579         } else if (outformat == FORMAT_PEM) {
 580             rv = PEM_write_bio_PKCS7_stream(out, p7, in, flags);
 581         } else if (outformat == FORMAT_ASN1) {
 582             rv = i2d_PKCS7_bio_stream(out, p7, in, flags);
 583         } else {
 584             BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
 585             goto end;
 586         }
 587         if (rv == 0) {
 588             BIO_printf(bio_err, "Error writing output\n");
 589             ret = 3;
 590             goto end;
 591         }
 592     }
 593     ret = 0;
 594  end:
 595     if (ret)
 596         ERR_print_errors(bio_err);
 597     sk_X509_pop_free(encerts, X509_free);
 598     sk_X509_pop_free(other, X509_free);
 599     X509_VERIFY_PARAM_free(vpm);
 600     sk_OPENSSL_STRING_free(sksigners);
 601     sk_OPENSSL_STRING_free(skkeys);
 602     X509_STORE_free(store);
 603     X509_free(cert);
 604     X509_free(recip);
 605     X509_free(signer);
 606     EVP_PKEY_free(key);
 607     PKCS7_free(p7);
 608     release_engine(e);
 609     BIO_free(in);
 610     BIO_free(indata);
 611     BIO_free_all(out);
 612     OPENSSL_free(passin);
 613     return ret;
 614 }
 615
 616 static int save_certs(char *signerfile, STACK_OF(X509) *signers)
 617 {
 618     int i;
 619     BIO *tmp;
 620
 621     if (signerfile == NULL)
 622         return 1;
 623     tmp = BIO_new_file(signerfile, "w");
 624     if (tmp == NULL)
 625         return 0;
 626     for (i = 0; i < sk_X509_num(signers); i++)
 627         PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
 628     BIO_free(tmp);
 629     return 1;
 630 }
 631
 632 /* Minimal callback just to output policy info (if any) */
 633
 634 static int smime_cb(int ok, X509_STORE_CTX *ctx)
 635 {
 636     int error;
 637
 638     error = X509_STORE_CTX_get_error(ctx);
 639
 640     if ((error != X509_V_ERR_NO_EXPLICIT_POLICY)
 641         && ((error != X509_V_OK) || (ok != 2)))
 642         return ok;
 643
 644     policies_print(ctx);
 645
 646     return ok;
 647 }