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 } 648