apps/smime.c

   1 /*
   2  * Copyright 1999-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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_COMMON,
  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_CAPATH, OPT_CASTORE, OPT_NOCAFILE, OPT_NOCAPATH, OPT_NOCASTORE,
  45     OPT_R_ENUM, OPT_PROV_ENUM, OPT_CONFIG,
  46     OPT_V_ENUM,
  47     OPT_IN, OPT_INFORM, OPT_OUT,
  48     OPT_OUTFORM, OPT_CONTENT
  49 } OPTION_CHOICE;
  50
  51 const OPTIONS smime_options[] = {
  52     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [cert...]\n"},
  53
  54     OPT_SECTION("General"),
  55     {"help", OPT_HELP, '-', "Display this summary"},
  56     {"in", OPT_IN, '<', "Input file"},
  57     {"inform", OPT_INFORM, 'c', "Input format SMIME (default), PEM or DER"},
  58     {"out", OPT_OUT, '>', "Output file"},
  59     {"outform", OPT_OUTFORM, 'c',
  60      "Output format SMIME (default), PEM or DER"},
  61     {"inkey", OPT_INKEY, 's',
  62      "Input private key (if not signer or recipient)"},
  63     {"keyform", OPT_KEYFORM, 'f', "Input private key format (ENGINE, other values ignored)"},
  64 #ifndef OPENSSL_NO_ENGINE
  65     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  66 #endif
  67     {"stream", OPT_STREAM, '-', "Enable CMS streaming" },
  68     {"indef", OPT_INDEF, '-', "Same as -stream" },
  69     {"noindef", OPT_NOINDEF, '-', "Disable CMS streaming"},
  70     OPT_CONFIG_OPTION,
  71
  72     OPT_SECTION("Action"),
  73     {"encrypt", OPT_ENCRYPT, '-', "Encrypt message"},
  74     {"decrypt", OPT_DECRYPT, '-', "Decrypt encrypted message"},
  75     {"sign", OPT_SIGN, '-', "Sign message"},
  76     {"resign", OPT_RESIGN, '-', "Resign a signed message"},
  77     {"verify", OPT_VERIFY, '-', "Verify signed message"},
  78
  79     OPT_SECTION("Signing/Encryption"),
  80     {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
  81     {"md", OPT_MD, 's', "Digest algorithm to use when signing or resigning"},
  82     {"", OPT_CIPHER, '-', "Any supported cipher"},
  83     {"pk7out", OPT_PK7OUT, '-', "Output PKCS#7 structure"},
  84     {"nointern", OPT_NOINTERN, '-',
  85      "Don't search certificates in message for signer"},
  86     {"nodetach", OPT_NODETACH, '-', "Use opaque signing"},
  87     {"noattr", OPT_NOATTR, '-', "Don't include any signed attributes"},
  88     {"binary", OPT_BINARY, '-', "Don't translate message to text"},
  89     {"signer", OPT_SIGNER, 's', "Signer certificate file"},
  90     {"content", OPT_CONTENT, '<',
  91      "Supply or override content for detached signature"},
  92     {"nocerts", OPT_NOCERTS, '-',
  93      "Don't include signers certificate when signing"},
  94
  95     OPT_SECTION("Verification/Decryption"),
  96     {"nosigs", OPT_NOSIGS, '-', "Don't verify message signature"},
  97     {"noverify", OPT_NOVERIFY, '-', "Don't verify signers certificate"},
  98
  99     {"certfile", OPT_CERTFILE, '<', "Other certificates file"},
 100     {"recip", OPT_RECIP, '<', "Recipient certificate file for decryption"},
 101
 102     OPT_SECTION("Email"),
 103     {"to", OPT_TO, 's', "To address"},
 104     {"from", OPT_FROM, 's', "From address"},
 105     {"subject", OPT_SUBJECT, 's', "Subject"},
 106     {"text", OPT_TEXT, '-', "Include or delete text MIME headers"},
 107     {"nosmimecap", OPT_NOSMIMECAP, '-', "Omit the SMIMECapabilities attribute"},
 108
 109     OPT_SECTION("Certificate chain"),
 110     {"CApath", OPT_CAPATH, '/', "Trusted certificates directory"},
 111     {"CAfile", OPT_CAFILE, '<', "Trusted certificates file"},
 112     {"CAstore", OPT_CASTORE, ':', "Trusted certificates store URI"},
 113     {"no-CAfile", OPT_NOCAFILE, '-',
 114      "Do not load the default certificates file"},
 115     {"no-CApath", OPT_NOCAPATH, '-',
 116      "Do not load certificates from the default certificates directory"},
 117     {"no-CAstore", OPT_NOCASTORE, '-',
 118      "Do not load certificates from the default certificates store"},
 119     {"nochain", OPT_NOCHAIN, '-',
 120      "set PKCS7_NOCHAIN so certificates contained in the message are not used as untrusted CAs" },
 121     {"crlfeol", OPT_CRLFEOL, '-', "Use CRLF as EOL termination instead of CR only"},
 122
 123     OPT_R_OPTIONS,
 124     OPT_V_OPTIONS,
 125     OPT_PROV_OPTIONS,
 126
 127     OPT_PARAMETERS(),
 128     {"cert", 0, 0, "Recipient certs, used when encrypting"},
 129     {NULL}
 130 };
 131
 132 int smime_main(int argc, char **argv)
 133 {
 134     CONF *conf = NULL;
 135     BIO *in = NULL, *out = NULL, *indata = NULL;
 136     EVP_PKEY *key = NULL;
 137     PKCS7 *p7 = NULL;
 138     STACK_OF(OPENSSL_STRING) *sksigners = NULL, *skkeys = NULL;
 139     STACK_OF(X509) *encerts = NULL, *other = NULL;
 140     X509 *cert = NULL, *recip = NULL, *signer = NULL;
 141     X509_STORE *store = NULL;
 142     X509_VERIFY_PARAM *vpm = NULL;
 143     EVP_CIPHER *cipher = NULL;
 144     EVP_MD *sign_md = NULL;
 145     const char *CAfile = NULL, *CApath = NULL, *CAstore = NULL, *prog = NULL;
 146     char *certfile = NULL, *keyfile = NULL, *contfile = NULL;
 147     char *infile = NULL, *outfile = NULL, *signerfile = NULL, *recipfile = NULL;
 148     char *passinarg = NULL, *passin = NULL, *to = NULL, *from = NULL;
 149     char *subject = NULL, *digestname = NULL, *ciphername = NULL;
 150     OPTION_CHOICE o;
 151     int noCApath = 0, noCAfile = 0, noCAstore = 0;
 152     int flags = PKCS7_DETACHED, operation = 0, ret = 0, indef = 0;
 153     int informat = FORMAT_SMIME, outformat = FORMAT_SMIME, keyform =
 154         FORMAT_UNDEF;
 155     int vpmtouched = 0, rv = 0;
 156     ENGINE *e = NULL;
 157     const char *mime_eol = "\n";
 158     OSSL_LIB_CTX *libctx = app_get0_libctx();
 159
 160     if ((vpm = X509_VERIFY_PARAM_new()) == NULL)
 161         return 1;
 162
 163     prog = opt_init(argc, argv, smime_options);
 164     while ((o = opt_next()) != OPT_EOF) {
 165         switch (o) {
 166         case OPT_EOF:
 167         case OPT_ERR:
 168  opthelp:
 169             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 170             goto end;
 171         case OPT_HELP:
 172             opt_help(smime_options);
 173             ret = 0;
 174             goto end;
 175         case OPT_INFORM:
 176             if (!opt_format(opt_arg(), OPT_FMT_PDS, &informat))
 177                 goto opthelp;
 178             break;
 179         case OPT_IN:
 180             infile = opt_arg();
 181             break;
 182         case OPT_OUTFORM:
 183             if (!opt_format(opt_arg(), OPT_FMT_PDS, &outformat))
 184                 goto opthelp;
 185             break;
 186         case OPT_OUT:
 187             outfile = opt_arg();
 188             break;
 189         case OPT_ENCRYPT:
 190             operation = SMIME_ENCRYPT;
 191             break;
 192         case OPT_DECRYPT:
 193             operation = SMIME_DECRYPT;
 194             break;
 195         case OPT_SIGN:
 196             operation = SMIME_SIGN;
 197             break;
 198         case OPT_RESIGN:
 199             operation = SMIME_RESIGN;
 200             break;
 201         case OPT_VERIFY:
 202             operation = SMIME_VERIFY;
 203             break;
 204         case OPT_PK7OUT:
 205             operation = SMIME_PK7OUT;
 206             break;
 207         case OPT_TEXT:
 208             flags |= PKCS7_TEXT;
 209             break;
 210         case OPT_NOINTERN:
 211             flags |= PKCS7_NOINTERN;
 212             break;
 213         case OPT_NOVERIFY:
 214             flags |= PKCS7_NOVERIFY;
 215             break;
 216         case OPT_NOCHAIN:
 217             flags |= PKCS7_NOCHAIN;
 218             break;
 219         case OPT_NOCERTS:
 220             flags |= PKCS7_NOCERTS;
 221             break;
 222         case OPT_NOATTR:
 223             flags |= PKCS7_NOATTR;
 224             break;
 225         case OPT_NODETACH:
 226             flags &= ~PKCS7_DETACHED;
 227             break;
 228         case OPT_NOSMIMECAP:
 229             flags |= PKCS7_NOSMIMECAP;
 230             break;
 231         case OPT_BINARY:
 232             flags |= PKCS7_BINARY;
 233             break;
 234         case OPT_NOSIGS:
 235             flags |= PKCS7_NOSIGS;
 236             break;
 237         case OPT_STREAM:
 238         case OPT_INDEF:
 239             indef = 1;
 240             break;
 241         case OPT_NOINDEF:
 242             indef = 0;
 243             break;
 244         case OPT_CRLFEOL:
 245             flags |= PKCS7_CRLFEOL;
 246             mime_eol = "\r\n";
 247             break;
 248         case OPT_R_CASES:
 249             if (!opt_rand(o))
 250                 goto end;
 251             break;
 252         case OPT_PROV_CASES:
 253             if (!opt_provider(o))
 254                 goto end;
 255             break;
 256         case OPT_CONFIG:
 257             conf = app_load_config_modules(opt_arg());
 258             if (conf == NULL)
 259                 goto end;
 260             break;
 261         case OPT_ENGINE:
 262             e = setup_engine(opt_arg(), 0);
 263             break;
 264         case OPT_PASSIN:
 265             passinarg = opt_arg();
 266             break;
 267         case OPT_TO:
 268             to = opt_arg();
 269             break;
 270         case OPT_FROM:
 271             from = opt_arg();
 272             break;
 273         case OPT_SUBJECT:
 274             subject = opt_arg();
 275             break;
 276         case OPT_SIGNER:
 277             /* If previous -signer argument add signer to list */
 278             if (signerfile != NULL) {
 279                 if (sksigners == NULL
 280                     && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
 281                     goto end;
 282                 sk_OPENSSL_STRING_push(sksigners, signerfile);
 283                 if (keyfile == NULL)
 284                     keyfile = signerfile;
 285                 if (skkeys == NULL
 286                     && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
 287                     goto end;
 288                 sk_OPENSSL_STRING_push(skkeys, keyfile);
 289                 keyfile = NULL;
 290             }
 291             signerfile = opt_arg();
 292             break;
 293         case OPT_RECIP:
 294             recipfile = opt_arg();
 295             break;
 296         case OPT_MD:
 297             digestname = opt_arg();
 298             break;
 299         case OPT_CIPHER:
 300             ciphername = opt_unknown();
 301             break;
 302         case OPT_INKEY:
 303             /* If previous -inkey argument add signer to list */
 304             if (keyfile != NULL) {
 305                 if (signerfile == NULL) {
 306                     BIO_printf(bio_err,
 307                                "%s: Must have -signer before -inkey\n", prog);
 308                     goto opthelp;
 309                 }
 310                 if (sksigners == NULL
 311                     && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
 312                     goto end;
 313                 sk_OPENSSL_STRING_push(sksigners, signerfile);
 314                 signerfile = NULL;
 315                 if (skkeys == NULL
 316                     && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
 317                     goto end;
 318                 sk_OPENSSL_STRING_push(skkeys, keyfile);
 319             }
 320             keyfile = opt_arg();
 321             break;
 322         case OPT_KEYFORM:
 323             if (!opt_format(opt_arg(), OPT_FMT_ANY, &keyform))
 324                 goto opthelp;
 325             break;
 326         case OPT_CERTFILE:
 327             certfile = opt_arg();
 328             break;
 329         case OPT_CAFILE:
 330             CAfile = opt_arg();
 331             break;
 332         case OPT_CAPATH:
 333             CApath = opt_arg();
 334             break;
 335         case OPT_CASTORE:
 336             CAstore = opt_arg();
 337             break;
 338         case OPT_NOCAFILE:
 339             noCAfile = 1;
 340             break;
 341         case OPT_NOCAPATH:
 342             noCApath = 1;
 343             break;
 344         case OPT_NOCASTORE:
 345             noCAstore = 1;
 346             break;
 347         case OPT_CONTENT:
 348             contfile = opt_arg();
 349             break;
 350         case OPT_V_CASES:
 351             if (!opt_verify(o, vpm))
 352                 goto opthelp;
 353             vpmtouched++;
 354             break;
 355         }
 356     }
 357
 358     /* Extra arguments are files with recipient keys. */
 359     argc = opt_num_rest();
 360     argv = opt_rest();
 361
 362     if (!app_RAND_load())
 363         goto end;
 364
 365     if (digestname != NULL) {
 366         if (!opt_md(digestname, &sign_md))
 367             goto opthelp;
 368     }
 369     if (!opt_cipher_any(ciphername, &cipher))
 370             goto opthelp;
 371     if (!(operation & SMIME_SIGNERS) && (skkeys != NULL || sksigners != NULL)) {
 372         BIO_puts(bio_err, "Multiple signers or keys not allowed\n");
 373         goto opthelp;
 374     }
 375     if (!operation) {
 376         BIO_puts(bio_err,
 377                 "No operation (-encrypt|-sign|...) specified\n");
 378         goto opthelp;
 379     }
 380
 381     if (operation & SMIME_SIGNERS) {
 382         /* Check to see if any final signer needs to be appended */
 383         if (keyfile && !signerfile) {
 384             BIO_puts(bio_err, "Illegal -inkey without -signer\n");
 385             goto opthelp;
 386         }
 387         if (signerfile != NULL) {
 388             if (sksigners == NULL
 389                 && (sksigners = sk_OPENSSL_STRING_new_null()) == NULL)
 390                 goto end;
 391             sk_OPENSSL_STRING_push(sksigners, signerfile);
 392             if (!skkeys && (skkeys = sk_OPENSSL_STRING_new_null()) == NULL)
 393                 goto end;
 394             if (!keyfile)
 395                 keyfile = signerfile;
 396             sk_OPENSSL_STRING_push(skkeys, keyfile);
 397         }
 398         if (sksigners == NULL) {
 399             BIO_printf(bio_err, "No signer certificate specified\n");
 400             goto opthelp;
 401         }
 402         signerfile = NULL;
 403         keyfile = NULL;
 404     } else if (operation == SMIME_DECRYPT) {
 405         if (recipfile == NULL && keyfile == NULL) {
 406             BIO_printf(bio_err,
 407                        "No recipient certificate or key specified\n");
 408             goto opthelp;
 409         }
 410     } else if (operation == SMIME_ENCRYPT) {
 411         if (argc == 0) {
 412             BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
 413             goto opthelp;
 414         }
 415     }
 416
 417     if (!app_passwd(passinarg, NULL, &passin, NULL)) {
 418         BIO_printf(bio_err, "Error getting password\n");
 419         goto end;
 420     }
 421
 422     ret = 2;
 423
 424     if (!(operation & SMIME_SIGNERS))
 425         flags &= ~PKCS7_DETACHED;
 426
 427     if (!(operation & SMIME_OP)) {
 428         if (flags & PKCS7_BINARY)
 429             outformat = FORMAT_BINARY;
 430     }
 431
 432     if (!(operation & SMIME_IP)) {
 433         if (flags & PKCS7_BINARY)
 434             informat = FORMAT_BINARY;
 435     }
 436
 437     if (operation == SMIME_ENCRYPT) {
 438         if (cipher == NULL) {
 439 #ifndef OPENSSL_NO_DES
 440             cipher = (EVP_CIPHER *)EVP_des_ede3_cbc();
 441 #else
 442             BIO_printf(bio_err, "No cipher selected\n");
 443             goto end;
 444 #endif
 445         }
 446         encerts = sk_X509_new_null();
 447         if (encerts == NULL)
 448             goto end;
 449         while (*argv != NULL) {
 450             cert = load_cert(*argv, FORMAT_UNDEF,
 451                              "recipient certificate file");
 452             if (cert == NULL)
 453                 goto end;
 454             sk_X509_push(encerts, cert);
 455             cert = NULL;
 456             argv++;
 457         }
 458     }
 459
 460     if (certfile != NULL) {
 461         if (!load_certs(certfile, 0, &other, NULL, "certificates")) {
 462             ERR_print_errors(bio_err);
 463             goto end;
 464         }
 465     }
 466
 467     if (recipfile != NULL && (operation == SMIME_DECRYPT)) {
 468         if ((recip = load_cert(recipfile, FORMAT_UNDEF,
 469                                "recipient certificate file")) == NULL) {
 470             ERR_print_errors(bio_err);
 471             goto end;
 472         }
 473     }
 474
 475     if (operation == SMIME_DECRYPT) {
 476         if (keyfile == NULL)
 477             keyfile = recipfile;
 478     } else if (operation == SMIME_SIGN) {
 479         if (keyfile == NULL)
 480             keyfile = signerfile;
 481     } else {
 482         keyfile = NULL;
 483     }
 484
 485     if (keyfile != NULL) {
 486         key = load_key(keyfile, keyform, 0, passin, e, "signing key");
 487         if (key == NULL)
 488             goto end;
 489     }
 490
 491     in = bio_open_default(infile, 'r', informat);
 492     if (in == NULL)
 493         goto end;
 494
 495     if (operation & SMIME_IP) {
 496         PKCS7 *p7_in = NULL;
 497
 498         p7 = PKCS7_new_ex(libctx, app_get0_propq());
 499         if (p7 == NULL) {
 500             BIO_printf(bio_err, "Error allocating PKCS7 object\n");
 501             goto end;
 502         }
 503         if (informat == FORMAT_SMIME) {
 504             p7_in = SMIME_read_PKCS7_ex(in, &indata, &p7);
 505         } else if (informat == FORMAT_PEM) {
 506             p7_in = PEM_read_bio_PKCS7(in, &p7, NULL, NULL);
 507         } else if (informat == FORMAT_ASN1) {
 508             p7_in = d2i_PKCS7_bio(in, &p7);
 509         } else {
 510             BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
 511             goto end;
 512         }
 513
 514         if (p7_in == NULL) {
 515             BIO_printf(bio_err, "Error reading S/MIME message\n");
 516             goto end;
 517         }
 518         if (contfile != NULL) {
 519             BIO_free(indata);
 520             if ((indata = BIO_new_file(contfile, "rb")) == NULL) {
 521                 BIO_printf(bio_err, "Can't read content file %s\n", contfile);
 522                 goto end;
 523             }
 524         }
 525     }
 526
 527     out = bio_open_default(outfile, 'w', outformat);
 528     if (out == NULL)
 529         goto end;
 530
 531     if (operation == SMIME_VERIFY) {
 532         if ((store = setup_verify(CAfile, noCAfile, CApath, noCApath,
 533                                   CAstore, noCAstore)) == NULL)
 534             goto end;
 535         X509_STORE_set_verify_cb(store, smime_cb);
 536         if (vpmtouched)
 537             X509_STORE_set1_param(store, vpm);
 538     }
 539
 540     ret = 3;
 541
 542     if (operation == SMIME_ENCRYPT) {
 543         if (indef)
 544             flags |= PKCS7_STREAM;
 545         p7 = PKCS7_encrypt_ex(encerts, in, cipher, flags, libctx, app_get0_propq());
 546     } else if (operation & SMIME_SIGNERS) {
 547         int i;
 548         /*
 549          * If detached data content we only enable streaming if S/MIME output
 550          * format.
 551          */
 552         if (operation == SMIME_SIGN) {
 553             if (flags & PKCS7_DETACHED) {
 554                 if (outformat == FORMAT_SMIME)
 555                     flags |= PKCS7_STREAM;
 556             } else if (indef) {
 557                 flags |= PKCS7_STREAM;
 558             }
 559             flags |= PKCS7_PARTIAL;
 560             p7 = PKCS7_sign_ex(NULL, NULL, other, in, flags, libctx, app_get0_propq());
 561             if (p7 == NULL)
 562                 goto end;
 563             if (flags & PKCS7_NOCERTS) {
 564                 for (i = 0; i < sk_X509_num(other); i++) {
 565                     X509 *x = sk_X509_value(other, i);
 566                     PKCS7_add_certificate(p7, x);
 567                 }
 568             }
 569         } else {
 570             flags |= PKCS7_REUSE_DIGEST;
 571         }
 572         for (i = 0; i < sk_OPENSSL_STRING_num(sksigners); i++) {
 573             signerfile = sk_OPENSSL_STRING_value(sksigners, i);
 574             keyfile = sk_OPENSSL_STRING_value(skkeys, i);
 575             signer = load_cert(signerfile, FORMAT_UNDEF, "signer certificate");
 576             if (signer == NULL)
 577                 goto end;
 578             key = load_key(keyfile, keyform, 0, passin, e, "signing key");
 579             if (key == NULL)
 580                 goto end;
 581
 582             if (!PKCS7_sign_add_signer(p7, signer, key, sign_md, flags))
 583                 goto end;
 584             X509_free(signer);
 585             signer = NULL;
 586             EVP_PKEY_free(key);
 587             key = NULL;
 588         }
 589         /* If not streaming or resigning finalize structure */
 590         if ((operation == SMIME_SIGN) && !(flags & PKCS7_STREAM)) {
 591             if (!PKCS7_final(p7, in, flags))
 592                 goto end;
 593         }
 594     }
 595
 596     if (p7 == NULL) {
 597         BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
 598         goto end;
 599     }
 600
 601     ret = 4;
 602     if (operation == SMIME_DECRYPT) {
 603         if (!PKCS7_decrypt(p7, key, recip, out, flags)) {
 604             BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
 605             goto end;
 606         }
 607     } else if (operation == SMIME_VERIFY) {
 608         STACK_OF(X509) *signers;
 609         if (PKCS7_verify(p7, other, store, indata, out, flags))
 610             BIO_printf(bio_err, "Verification successful\n");
 611         else {
 612             BIO_printf(bio_err, "Verification failure\n");
 613             goto end;
 614         }
 615         signers = PKCS7_get0_signers(p7, other, flags);
 616         if (!save_certs(signerfile, signers)) {
 617             BIO_printf(bio_err, "Error writing signers to %s\n", signerfile);
 618             ret = 5;
 619             goto end;
 620         }
 621         sk_X509_free(signers);
 622     } else if (operation == SMIME_PK7OUT) {
 623         PEM_write_bio_PKCS7(out, p7);
 624     } else {
 625         if (to)
 626             BIO_printf(out, "To: %s%s", to, mime_eol);
 627         if (from)
 628             BIO_printf(out, "From: %s%s", from, mime_eol);
 629         if (subject)
 630             BIO_printf(out, "Subject: %s%s", subject, mime_eol);
 631         if (outformat == FORMAT_SMIME) {
 632             if (operation == SMIME_RESIGN)
 633                 rv = SMIME_write_PKCS7(out, p7, indata, flags);
 634             else
 635                 rv = SMIME_write_PKCS7(out, p7, in, flags);
 636         } else if (outformat == FORMAT_PEM) {
 637             rv = PEM_write_bio_PKCS7_stream(out, p7, in, flags);
 638         } else if (outformat == FORMAT_ASN1) {
 639             rv = i2d_PKCS7_bio_stream(out, p7, in, flags);
 640         } else {
 641             BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
 642             goto end;
 643         }
 644         if (rv == 0) {
 645             BIO_printf(bio_err, "Error writing output\n");
 646             ret = 3;
 647             goto end;
 648         }
 649     }
 650     ret = 0;
 651  end:
 652     if (ret)
 653         ERR_print_errors(bio_err);
 654     sk_X509_pop_free(encerts, X509_free);
 655     sk_X509_pop_free(other, X509_free);
 656     X509_VERIFY_PARAM_free(vpm);
 657     sk_OPENSSL_STRING_free(sksigners);
 658     sk_OPENSSL_STRING_free(skkeys);
 659     X509_STORE_free(store);
 660     X509_free(cert);
 661     X509_free(recip);
 662     X509_free(signer);
 663     EVP_PKEY_free(key);
 664     EVP_MD_free(sign_md);
 665     EVP_CIPHER_free(cipher);
 666     PKCS7_free(p7);
 667     release_engine(e);
 668     BIO_free(in);
 669     BIO_free(indata);
 670     BIO_free_all(out);
 671     OPENSSL_free(passin);
 672     NCONF_free(conf);
 673     return ret;
 674 }
 675
 676 static int save_certs(char *signerfile, STACK_OF(X509) *signers)
 677 {
 678     int i;
 679     BIO *tmp;
 680
 681     if (signerfile == NULL)
 682         return 1;
 683     tmp = BIO_new_file(signerfile, "w");
 684     if (tmp == NULL)
 685         return 0;
 686     for (i = 0; i < sk_X509_num(signers); i++)
 687         PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
 688     BIO_free(tmp);
 689     return 1;
 690 }
 691
 692 /* Minimal callback just to output policy info (if any) */
 693
 694 static int smime_cb(int ok, X509_STORE_CTX *ctx)
 695 {
 696     int error;
 697
 698     error = X509_STORE_CTX_get_error(ctx);
 699
 700     if ((error != X509_V_ERR_NO_EXPLICIT_POLICY)
 701         && ((error != X509_V_OK) || (ok != 2)))
 702         return ok;
 703
 704     policies_print(ctx);
 705
 706     return ok;
 707 }