1/* smime.c */ 2/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL 3 * project 1999. 4 */ 5/* ==================================================================== 6 * Copyright (c) 1999 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing@OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58 59/* S/MIME utility function */ 60 61#include <stdio.h> 62#include <string.h> 63#include "apps.h" 64#include <openssl/crypto.h> 65#include <openssl/pem.h> 66#include <openssl/err.h> 67 68#undef PROG 69#define PROG smime_main 70static int save_certs(char *signerfile, STACK_OF(X509) *signers); 71 72#define SMIME_OP 0x10 73#define SMIME_ENCRYPT (1 | SMIME_OP) 74#define SMIME_DECRYPT 2 75#define SMIME_SIGN (3 | SMIME_OP) 76#define SMIME_VERIFY 4 77#define SMIME_PK7OUT 5 78 79int MAIN(int, char **); 80 81int MAIN(int argc, char **argv) 82{ 83 ENGINE *e = NULL; 84 int operation = 0; 85 int ret = 0; 86 char **args; 87 char *inmode = "r", *outmode = "w"; 88 char *infile = NULL, *outfile = NULL; 89 char *signerfile = NULL, *recipfile = NULL; 90 char *certfile = NULL, *keyfile = NULL, *contfile=NULL; 91 const EVP_CIPHER *cipher = NULL; 92 PKCS7 *p7 = NULL; 93 X509_STORE *store = NULL; 94 X509 *cert = NULL, *recip = NULL, *signer = NULL; 95 EVP_PKEY *key = NULL; 96 STACK_OF(X509) *encerts = NULL, *other = NULL; 97 BIO *in = NULL, *out = NULL, *indata = NULL; 98 int badarg = 0; 99 int flags = PKCS7_DETACHED, store_flags = 0; 100 char *to = NULL, *from = NULL, *subject = NULL; 101 char *CAfile = NULL, *CApath = NULL; 102 char *passargin = NULL, *passin = NULL; 103 char *inrand = NULL; 104 int need_rand = 0; 105 int informat = FORMAT_SMIME, outformat = FORMAT_SMIME; 106 int keyform = FORMAT_PEM; 107#ifndef OPENSSL_NO_ENGINE 108 char *engine=NULL; 109#endif 110 111 args = argv + 1; 112 ret = 1; 113 114 apps_startup(); 115 116 if (bio_err == NULL) 117 if ((bio_err = BIO_new(BIO_s_file())) != NULL) 118 BIO_set_fp(bio_err, stderr, BIO_NOCLOSE|BIO_FP_TEXT); 119 120 if (!load_config(bio_err, NULL)) 121 goto end; 122 123 while (!badarg && *args && *args[0] == '-') { 124 if (!strcmp (*args, "-encrypt")) operation = SMIME_ENCRYPT; 125 else if (!strcmp (*args, "-decrypt")) operation = SMIME_DECRYPT; 126 else if (!strcmp (*args, "-sign")) operation = SMIME_SIGN; 127 else if (!strcmp (*args, "-verify")) operation = SMIME_VERIFY; 128 else if (!strcmp (*args, "-pk7out")) operation = SMIME_PK7OUT; 129#ifndef OPENSSL_NO_DES 130 else if (!strcmp (*args, "-des3")) 131 cipher = EVP_des_ede3_cbc(); 132 else if (!strcmp (*args, "-des")) 133 cipher = EVP_des_cbc(); 134#endif 135#ifndef OPENSSL_NO_RC2 136 else if (!strcmp (*args, "-rc2-40")) 137 cipher = EVP_rc2_40_cbc(); 138 else if (!strcmp (*args, "-rc2-128")) 139 cipher = EVP_rc2_cbc(); 140 else if (!strcmp (*args, "-rc2-64")) 141 cipher = EVP_rc2_64_cbc(); 142#endif 143#ifndef OPENSSL_NO_AES 144 else if (!strcmp(*args,"-aes128")) 145 cipher = EVP_aes_128_cbc(); 146 else if (!strcmp(*args,"-aes192")) 147 cipher = EVP_aes_192_cbc(); 148 else if (!strcmp(*args,"-aes256")) 149 cipher = EVP_aes_256_cbc(); 150#endif 151 else if (!strcmp (*args, "-text")) 152 flags |= PKCS7_TEXT; 153 else if (!strcmp (*args, "-nointern")) 154 flags |= PKCS7_NOINTERN; 155 else if (!strcmp (*args, "-noverify")) 156 flags |= PKCS7_NOVERIFY; 157 else if (!strcmp (*args, "-nochain")) 158 flags |= PKCS7_NOCHAIN; 159 else if (!strcmp (*args, "-nocerts")) 160 flags |= PKCS7_NOCERTS; 161 else if (!strcmp (*args, "-noattr")) 162 flags |= PKCS7_NOATTR; 163 else if (!strcmp (*args, "-nodetach")) 164 flags &= ~PKCS7_DETACHED; 165 else if (!strcmp (*args, "-nosmimecap")) 166 flags |= PKCS7_NOSMIMECAP; 167 else if (!strcmp (*args, "-binary")) 168 flags |= PKCS7_BINARY; 169 else if (!strcmp (*args, "-nosigs")) 170 flags |= PKCS7_NOSIGS; 171 else if (!strcmp (*args, "-nooldmime")) 172 flags |= PKCS7_NOOLDMIMETYPE; 173 else if (!strcmp (*args, "-crlfeol")) 174 flags |= PKCS7_CRLFEOL; 175 else if (!strcmp (*args, "-crl_check")) 176 store_flags |= X509_V_FLAG_CRL_CHECK; 177 else if (!strcmp (*args, "-crl_check_all")) 178 store_flags |= X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL; 179 else if (!strcmp(*args,"-rand")) { 180 if (args[1]) { 181 args++; 182 inrand = *args; 183 } else badarg = 1; 184 need_rand = 1; 185#ifndef OPENSSL_NO_ENGINE 186 } else if (!strcmp(*args,"-engine")) { 187 if (args[1]) { 188 args++; 189 engine = *args; 190 } else badarg = 1; 191#endif 192 } else if (!strcmp(*args,"-passin")) { 193 if (args[1]) { 194 args++; 195 passargin = *args; 196 } else badarg = 1; 197 } else if (!strcmp (*args, "-to")) { 198 if (args[1]) { 199 args++; 200 to = *args; 201 } else badarg = 1; 202 } else if (!strcmp (*args, "-from")) { 203 if (args[1]) { 204 args++; 205 from = *args; 206 } else badarg = 1; 207 } else if (!strcmp (*args, "-subject")) { 208 if (args[1]) { 209 args++; 210 subject = *args; 211 } else badarg = 1; 212 } else if (!strcmp (*args, "-signer")) { 213 if (args[1]) { 214 args++; 215 signerfile = *args; 216 } else badarg = 1; 217 } else if (!strcmp (*args, "-recip")) { 218 if (args[1]) { 219 args++; 220 recipfile = *args; 221 } else badarg = 1; 222 } else if (!strcmp (*args, "-inkey")) { 223 if (args[1]) { 224 args++; 225 keyfile = *args; 226 } else badarg = 1; 227 } else if (!strcmp (*args, "-keyform")) { 228 if (args[1]) { 229 args++; 230 keyform = str2fmt(*args); 231 } else badarg = 1; 232 } else if (!strcmp (*args, "-certfile")) { 233 if (args[1]) { 234 args++; 235 certfile = *args; 236 } else badarg = 1; 237 } else if (!strcmp (*args, "-CAfile")) { 238 if (args[1]) { 239 args++; 240 CAfile = *args; 241 } else badarg = 1; 242 } else if (!strcmp (*args, "-CApath")) { 243 if (args[1]) { 244 args++; 245 CApath = *args; 246 } else badarg = 1; 247 } else if (!strcmp (*args, "-in")) { 248 if (args[1]) { 249 args++; 250 infile = *args; 251 } else badarg = 1; 252 } else if (!strcmp (*args, "-inform")) { 253 if (args[1]) { 254 args++; 255 informat = str2fmt(*args); 256 } else badarg = 1; 257 } else if (!strcmp (*args, "-outform")) { 258 if (args[1]) { 259 args++; 260 outformat = str2fmt(*args); 261 } else badarg = 1; 262 } else if (!strcmp (*args, "-out")) { 263 if (args[1]) { 264 args++; 265 outfile = *args; 266 } else badarg = 1; 267 } else if (!strcmp (*args, "-content")) { 268 if (args[1]) { 269 args++; 270 contfile = *args; 271 } else badarg = 1; 272 } else badarg = 1; 273 args++; 274 } 275 276 if(operation == SMIME_SIGN) { 277 if(!signerfile) { 278 BIO_printf(bio_err, "No signer certificate specified\n"); 279 badarg = 1; 280 } 281 need_rand = 1; 282 } else if(operation == SMIME_DECRYPT) { 283 if(!recipfile) { 284 BIO_printf(bio_err, "No recipient certificate and key specified\n"); 285 badarg = 1; 286 } 287 } else if(operation == SMIME_ENCRYPT) { 288 if(!*args) { 289 BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n"); 290 badarg = 1; 291 } 292 need_rand = 1; 293 } else if(!operation) badarg = 1; 294 295 if (badarg) { 296 BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n"); 297 BIO_printf (bio_err, "where options are\n"); 298 BIO_printf (bio_err, "-encrypt encrypt message\n"); 299 BIO_printf (bio_err, "-decrypt decrypt encrypted message\n"); 300 BIO_printf (bio_err, "-sign sign message\n"); 301 BIO_printf (bio_err, "-verify verify signed message\n"); 302 BIO_printf (bio_err, "-pk7out output PKCS#7 structure\n"); 303#ifndef OPENSSL_NO_DES 304 BIO_printf (bio_err, "-des3 encrypt with triple DES\n"); 305 BIO_printf (bio_err, "-des encrypt with DES\n"); 306#endif 307#ifndef OPENSSL_NO_RC2 308 BIO_printf (bio_err, "-rc2-40 encrypt with RC2-40 (default)\n"); 309 BIO_printf (bio_err, "-rc2-64 encrypt with RC2-64\n"); 310 BIO_printf (bio_err, "-rc2-128 encrypt with RC2-128\n"); 311#endif 312#ifndef OPENSSL_NO_AES 313 BIO_printf (bio_err, "-aes128, -aes192, -aes256\n"); 314 BIO_printf (bio_err, " encrypt PEM output with cbc aes\n"); 315#endif 316 BIO_printf (bio_err, "-nointern don't search certificates in message for signer\n"); 317 BIO_printf (bio_err, "-nosigs don't verify message signature\n"); 318 BIO_printf (bio_err, "-noverify don't verify signers certificate\n"); 319 BIO_printf (bio_err, "-nocerts don't include signers certificate when signing\n"); 320 BIO_printf (bio_err, "-nodetach use opaque signing\n"); 321 BIO_printf (bio_err, "-noattr don't include any signed attributes\n"); 322 BIO_printf (bio_err, "-binary don't translate message to text\n"); 323 BIO_printf (bio_err, "-certfile file other certificates file\n"); 324 BIO_printf (bio_err, "-signer file signer certificate file\n"); 325 BIO_printf (bio_err, "-recip file recipient certificate file for decryption\n"); 326 BIO_printf (bio_err, "-in file input file\n"); 327 BIO_printf (bio_err, "-inform arg input format SMIME (default), PEM or DER\n"); 328 BIO_printf (bio_err, "-inkey file input private key (if not signer or recipient)\n"); 329 BIO_printf (bio_err, "-keyform arg input private key format (PEM or ENGINE)\n"); 330 BIO_printf (bio_err, "-out file output file\n"); 331 BIO_printf (bio_err, "-outform arg output format SMIME (default), PEM or DER\n"); 332 BIO_printf (bio_err, "-content file supply or override content for detached signature\n"); 333 BIO_printf (bio_err, "-to addr to address\n"); 334 BIO_printf (bio_err, "-from ad from address\n"); 335 BIO_printf (bio_err, "-subject s subject\n"); 336 BIO_printf (bio_err, "-text include or delete text MIME headers\n"); 337 BIO_printf (bio_err, "-CApath dir trusted certificates directory\n"); 338 BIO_printf (bio_err, "-CAfile file trusted certificates file\n"); 339 BIO_printf (bio_err, "-crl_check check revocation status of signer's certificate using CRLs\n"); 340 BIO_printf (bio_err, "-crl_check_all check revocation status of signer's certificate chain using CRLs\n"); 341#ifndef OPENSSL_NO_ENGINE 342 BIO_printf (bio_err, "-engine e use engine e, possibly a hardware device.\n"); 343#endif 344 BIO_printf (bio_err, "-passin arg input file pass phrase source\n"); 345 BIO_printf(bio_err, "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR); 346 BIO_printf(bio_err, " load the file (or the files in the directory) into\n"); 347 BIO_printf(bio_err, " the random number generator\n"); 348 BIO_printf (bio_err, "cert.pem recipient certificate(s) for encryption\n"); 349 goto end; 350 } 351 352#ifndef OPENSSL_NO_ENGINE 353 e = setup_engine(bio_err, engine, 0); 354#endif 355 356 if(!app_passwd(bio_err, passargin, NULL, &passin, NULL)) { 357 BIO_printf(bio_err, "Error getting password\n"); 358 goto end; 359 } 360 361 if (need_rand) { 362 app_RAND_load_file(NULL, bio_err, (inrand != NULL)); 363 if (inrand != NULL) 364 BIO_printf(bio_err,"%ld semi-random bytes loaded\n", 365 app_RAND_load_files(inrand)); 366 } 367 368 ret = 2; 369 370 if(operation != SMIME_SIGN) flags &= ~PKCS7_DETACHED; 371 372 if(operation & SMIME_OP) { 373 if(flags & PKCS7_BINARY) inmode = "rb"; 374 if(outformat == FORMAT_ASN1) outmode = "wb"; 375 } else { 376 if(flags & PKCS7_BINARY) outmode = "wb"; 377 if(informat == FORMAT_ASN1) inmode = "rb"; 378 } 379 380 if(operation == SMIME_ENCRYPT) { 381 if (!cipher) { 382#ifndef OPENSSL_NO_RC2 383 cipher = EVP_rc2_40_cbc(); 384#else 385 BIO_printf(bio_err, "No cipher selected\n"); 386 goto end; 387#endif 388 } 389 encerts = sk_X509_new_null(); 390 while (*args) { 391 if(!(cert = load_cert(bio_err,*args,FORMAT_PEM, 392 NULL, e, "recipient certificate file"))) { 393#if 0 /* An appropriate message is already printed */ 394 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", *args); 395#endif 396 goto end; 397 } 398 sk_X509_push(encerts, cert); 399 cert = NULL; 400 args++; 401 } 402 } 403 404 if(signerfile && (operation == SMIME_SIGN)) { 405 if(!(signer = load_cert(bio_err,signerfile,FORMAT_PEM, NULL, 406 e, "signer certificate"))) { 407#if 0 /* An appropri message has already been printed */ 408 BIO_printf(bio_err, "Can't read signer certificate file %s\n", signerfile); 409#endif 410 goto end; 411 } 412 } 413 414 if(certfile) { 415 if(!(other = load_certs(bio_err,certfile,FORMAT_PEM, NULL, 416 e, "certificate file"))) { 417#if 0 /* An appropriate message has already been printed */ 418 BIO_printf(bio_err, "Can't read certificate file %s\n", certfile); 419#endif 420 ERR_print_errors(bio_err); 421 goto end; 422 } 423 } 424 425 if(recipfile && (operation == SMIME_DECRYPT)) { 426 if(!(recip = load_cert(bio_err,recipfile,FORMAT_PEM,NULL, 427 e, "recipient certificate file"))) { 428#if 0 /* An appropriate message has alrady been printed */ 429 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", recipfile); 430#endif 431 ERR_print_errors(bio_err); 432 goto end; 433 } 434 } 435 436 if(operation == SMIME_DECRYPT) { 437 if(!keyfile) keyfile = recipfile; 438 } else if(operation == SMIME_SIGN) { 439 if(!keyfile) keyfile = signerfile; 440 } else keyfile = NULL; 441 442 if(keyfile) { 443 key = load_key(bio_err, keyfile, keyform, 0, passin, e, 444 "signing key file"); 445 if (!key) { 446 goto end; 447 } 448 } 449 450 if (infile) { 451 if (!(in = BIO_new_file(infile, inmode))) { 452 BIO_printf (bio_err, 453 "Can't open input file %s\n", infile); 454 goto end; 455 } 456 } else in = BIO_new_fp(stdin, BIO_NOCLOSE); 457 458 if (outfile) { 459 if (!(out = BIO_new_file(outfile, outmode))) { 460 BIO_printf (bio_err, 461 "Can't open output file %s\n", outfile); 462 goto end; 463 } 464 } else { 465 out = BIO_new_fp(stdout, BIO_NOCLOSE); 466#ifdef OPENSSL_SYS_VMS 467 { 468 BIO *tmpbio = BIO_new(BIO_f_linebuffer()); 469 out = BIO_push(tmpbio, out); 470 } 471#endif 472 } 473 474 if(operation == SMIME_VERIFY) { 475 if(!(store = setup_verify(bio_err, CAfile, CApath))) goto end; 476 X509_STORE_set_flags(store, store_flags); 477 } 478 479 480 ret = 3; 481 482 if(operation == SMIME_ENCRYPT) { 483 p7 = PKCS7_encrypt(encerts, in, cipher, flags); 484 } else if(operation == SMIME_SIGN) { 485 p7 = PKCS7_sign(signer, key, other, in, flags); 486 if (BIO_reset(in) != 0 && (flags & PKCS7_DETACHED)) { 487 BIO_printf(bio_err, "Can't rewind input file\n"); 488 goto end; 489 } 490 } else { 491 if(informat == FORMAT_SMIME) 492 p7 = SMIME_read_PKCS7(in, &indata); 493 else if(informat == FORMAT_PEM) 494 p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL); 495 else if(informat == FORMAT_ASN1) 496 p7 = d2i_PKCS7_bio(in, NULL); 497 else { 498 BIO_printf(bio_err, "Bad input format for PKCS#7 file\n"); 499 goto end; 500 } 501 502 if(!p7) { 503 BIO_printf(bio_err, "Error reading S/MIME message\n"); 504 goto end; 505 } 506 if(contfile) { 507 BIO_free(indata); 508 if(!(indata = BIO_new_file(contfile, "rb"))) { 509 BIO_printf(bio_err, "Can't read content file %s\n", contfile); 510 goto end; 511 } 512 } 513 } 514 515 if(!p7) { 516 BIO_printf(bio_err, "Error creating PKCS#7 structure\n"); 517 goto end; 518 } 519 520 ret = 4; 521 if(operation == SMIME_DECRYPT) { 522 if(!PKCS7_decrypt(p7, key, recip, out, flags)) { 523 BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n"); 524 goto end; 525 } 526 } else if(operation == SMIME_VERIFY) { 527 STACK_OF(X509) *signers; 528 if(PKCS7_verify(p7, other, store, indata, out, flags)) { 529 BIO_printf(bio_err, "Verification successful\n"); 530 } else { 531 BIO_printf(bio_err, "Verification failure\n"); 532 goto end; 533 } 534 signers = PKCS7_get0_signers(p7, other, flags); 535 if(!save_certs(signerfile, signers)) { 536 BIO_printf(bio_err, "Error writing signers to %s\n", 537 signerfile); 538 ret = 5; 539 goto end; 540 } 541 sk_X509_free(signers); 542 } else if(operation == SMIME_PK7OUT) { 543 PEM_write_bio_PKCS7(out, p7); 544 } else { 545 if(to) BIO_printf(out, "To: %s\n", to); 546 if(from) BIO_printf(out, "From: %s\n", from); 547 if(subject) BIO_printf(out, "Subject: %s\n", subject); 548 if(outformat == FORMAT_SMIME) 549 SMIME_write_PKCS7(out, p7, in, flags); 550 else if(outformat == FORMAT_PEM) 551 PEM_write_bio_PKCS7(out,p7); 552 else if(outformat == FORMAT_ASN1) 553 i2d_PKCS7_bio(out,p7); 554 else { 555 BIO_printf(bio_err, "Bad output format for PKCS#7 file\n"); 556 goto end; 557 } 558 } 559 ret = 0; 560end: 561 if (need_rand) 562 app_RAND_write_file(NULL, bio_err); 563 if(ret) ERR_print_errors(bio_err); 564 sk_X509_pop_free(encerts, X509_free); 565 sk_X509_pop_free(other, X509_free); 566 X509_STORE_free(store); 567 X509_free(cert); 568 X509_free(recip); 569 X509_free(signer); 570 EVP_PKEY_free(key); 571 PKCS7_free(p7); 572 BIO_free(in); 573 BIO_free(indata); 574 BIO_free_all(out); 575 if(passin) OPENSSL_free(passin); 576 return (ret); 577} 578 579static int save_certs(char *signerfile, STACK_OF(X509) *signers) 580{ 581 int i; 582 BIO *tmp; 583 if(!signerfile) return 1; 584 tmp = BIO_new_file(signerfile, "w"); 585 if(!tmp) return 0; 586 for(i = 0; i < sk_X509_num(signers); i++) 587 PEM_write_bio_X509(tmp, sk_X509_value(signers, i)); 588 BIO_free(tmp); 589 return 1; 590} 591 592