smime.c revision 111147
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, "-crl_check")) 172 store_flags |= X509_V_FLAG_CRL_CHECK; 173 else if (!strcmp (*args, "-crl_check_all")) 174 store_flags |= X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL; 175 else if (!strcmp(*args,"-rand")) { 176 if (args[1]) { 177 args++; 178 inrand = *args; 179 } else badarg = 1; 180 need_rand = 1; 181#ifndef OPENSSL_NO_ENGINE 182 } else if (!strcmp(*args,"-engine")) { 183 if (args[1]) { 184 args++; 185 engine = *args; 186 } else badarg = 1; 187#endif 188 } else if (!strcmp(*args,"-passin")) { 189 if (args[1]) { 190 args++; 191 passargin = *args; 192 } else badarg = 1; 193 } else if (!strcmp (*args, "-to")) { 194 if (args[1]) { 195 args++; 196 to = *args; 197 } else badarg = 1; 198 } else if (!strcmp (*args, "-from")) { 199 if (args[1]) { 200 args++; 201 from = *args; 202 } else badarg = 1; 203 } else if (!strcmp (*args, "-subject")) { 204 if (args[1]) { 205 args++; 206 subject = *args; 207 } else badarg = 1; 208 } else if (!strcmp (*args, "-signer")) { 209 if (args[1]) { 210 args++; 211 signerfile = *args; 212 } else badarg = 1; 213 } else if (!strcmp (*args, "-recip")) { 214 if (args[1]) { 215 args++; 216 recipfile = *args; 217 } else badarg = 1; 218 } else if (!strcmp (*args, "-inkey")) { 219 if (args[1]) { 220 args++; 221 keyfile = *args; 222 } else badarg = 1; 223 } else if (!strcmp (*args, "-keyform")) { 224 if (args[1]) { 225 args++; 226 keyform = str2fmt(*args); 227 } else badarg = 1; 228 } else if (!strcmp (*args, "-certfile")) { 229 if (args[1]) { 230 args++; 231 certfile = *args; 232 } else badarg = 1; 233 } else if (!strcmp (*args, "-CAfile")) { 234 if (args[1]) { 235 args++; 236 CAfile = *args; 237 } else badarg = 1; 238 } else if (!strcmp (*args, "-CApath")) { 239 if (args[1]) { 240 args++; 241 CApath = *args; 242 } else badarg = 1; 243 } else if (!strcmp (*args, "-in")) { 244 if (args[1]) { 245 args++; 246 infile = *args; 247 } else badarg = 1; 248 } else if (!strcmp (*args, "-inform")) { 249 if (args[1]) { 250 args++; 251 informat = str2fmt(*args); 252 } else badarg = 1; 253 } else if (!strcmp (*args, "-outform")) { 254 if (args[1]) { 255 args++; 256 outformat = str2fmt(*args); 257 } else badarg = 1; 258 } else if (!strcmp (*args, "-out")) { 259 if (args[1]) { 260 args++; 261 outfile = *args; 262 } else badarg = 1; 263 } else if (!strcmp (*args, "-content")) { 264 if (args[1]) { 265 args++; 266 contfile = *args; 267 } else badarg = 1; 268 } else badarg = 1; 269 args++; 270 } 271 272 if(operation == SMIME_SIGN) { 273 if(!signerfile) { 274 BIO_printf(bio_err, "No signer certificate specified\n"); 275 badarg = 1; 276 } 277 need_rand = 1; 278 } else if(operation == SMIME_DECRYPT) { 279 if(!recipfile) { 280 BIO_printf(bio_err, "No recipient certificate and key specified\n"); 281 badarg = 1; 282 } 283 } else if(operation == SMIME_ENCRYPT) { 284 if(!*args) { 285 BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n"); 286 badarg = 1; 287 } 288 need_rand = 1; 289 } else if(!operation) badarg = 1; 290 291 if (badarg) { 292 BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n"); 293 BIO_printf (bio_err, "where options are\n"); 294 BIO_printf (bio_err, "-encrypt encrypt message\n"); 295 BIO_printf (bio_err, "-decrypt decrypt encrypted message\n"); 296 BIO_printf (bio_err, "-sign sign message\n"); 297 BIO_printf (bio_err, "-verify verify signed message\n"); 298 BIO_printf (bio_err, "-pk7out output PKCS#7 structure\n"); 299#ifndef OPENSSL_NO_DES 300 BIO_printf (bio_err, "-des3 encrypt with triple DES\n"); 301 BIO_printf (bio_err, "-des encrypt with DES\n"); 302#endif 303#ifndef OPENSSL_NO_RC2 304 BIO_printf (bio_err, "-rc2-40 encrypt with RC2-40 (default)\n"); 305 BIO_printf (bio_err, "-rc2-64 encrypt with RC2-64\n"); 306 BIO_printf (bio_err, "-rc2-128 encrypt with RC2-128\n"); 307#endif 308#ifndef OPENSSL_NO_AES 309 BIO_printf (bio_err, "-aes128, -aes192, -aes256\n"); 310 BIO_printf (bio_err, " encrypt PEM output with cbc aes\n"); 311#endif 312 BIO_printf (bio_err, "-nointern don't search certificates in message for signer\n"); 313 BIO_printf (bio_err, "-nosigs don't verify message signature\n"); 314 BIO_printf (bio_err, "-noverify don't verify signers certificate\n"); 315 BIO_printf (bio_err, "-nocerts don't include signers certificate when signing\n"); 316 BIO_printf (bio_err, "-nodetach use opaque signing\n"); 317 BIO_printf (bio_err, "-noattr don't include any signed attributes\n"); 318 BIO_printf (bio_err, "-binary don't translate message to text\n"); 319 BIO_printf (bio_err, "-certfile file other certificates file\n"); 320 BIO_printf (bio_err, "-signer file signer certificate file\n"); 321 BIO_printf (bio_err, "-recip file recipient certificate file for decryption\n"); 322 BIO_printf (bio_err, "-in file input file\n"); 323 BIO_printf (bio_err, "-inform arg input format SMIME (default), PEM or DER\n"); 324 BIO_printf (bio_err, "-inkey file input private key (if not signer or recipient)\n"); 325 BIO_printf (bio_err, "-keyform arg input private key format (PEM or ENGINE)\n"); 326 BIO_printf (bio_err, "-out file output file\n"); 327 BIO_printf (bio_err, "-outform arg output format SMIME (default), PEM or DER\n"); 328 BIO_printf (bio_err, "-content file supply or override content for detached signature\n"); 329 BIO_printf (bio_err, "-to addr to address\n"); 330 BIO_printf (bio_err, "-from ad from address\n"); 331 BIO_printf (bio_err, "-subject s subject\n"); 332 BIO_printf (bio_err, "-text include or delete text MIME headers\n"); 333 BIO_printf (bio_err, "-CApath dir trusted certificates directory\n"); 334 BIO_printf (bio_err, "-CAfile file trusted certificates file\n"); 335 BIO_printf (bio_err, "-crl_check check revocation status of signer's certificate using CRLs\n"); 336 BIO_printf (bio_err, "-crl_check_all check revocation status of signer's certificate chain using CRLs\n"); 337#ifndef OPENSSL_NO_ENGINE 338 BIO_printf (bio_err, "-engine e use engine e, possibly a hardware device.\n"); 339#endif 340 BIO_printf (bio_err, "-passin arg input file pass phrase source\n"); 341 BIO_printf(bio_err, "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR); 342 BIO_printf(bio_err, " load the file (or the files in the directory) into\n"); 343 BIO_printf(bio_err, " the random number generator\n"); 344 BIO_printf (bio_err, "cert.pem recipient certificate(s) for encryption\n"); 345 goto end; 346 } 347 348#ifndef OPENSSL_NO_ENGINE 349 e = setup_engine(bio_err, engine, 0); 350#endif 351 352 if(!app_passwd(bio_err, passargin, NULL, &passin, NULL)) { 353 BIO_printf(bio_err, "Error getting password\n"); 354 goto end; 355 } 356 357 if (need_rand) { 358 app_RAND_load_file(NULL, bio_err, (inrand != NULL)); 359 if (inrand != NULL) 360 BIO_printf(bio_err,"%ld semi-random bytes loaded\n", 361 app_RAND_load_files(inrand)); 362 } 363 364 ret = 2; 365 366 if(operation != SMIME_SIGN) flags &= ~PKCS7_DETACHED; 367 368 if(operation & SMIME_OP) { 369 if(flags & PKCS7_BINARY) inmode = "rb"; 370 if(outformat == FORMAT_ASN1) outmode = "wb"; 371 } else { 372 if(flags & PKCS7_BINARY) outmode = "wb"; 373 if(informat == FORMAT_ASN1) inmode = "rb"; 374 } 375 376 if(operation == SMIME_ENCRYPT) { 377 if (!cipher) { 378#ifndef OPENSSL_NO_RC2 379 cipher = EVP_rc2_40_cbc(); 380#else 381 BIO_printf(bio_err, "No cipher selected\n"); 382 goto end; 383#endif 384 } 385 encerts = sk_X509_new_null(); 386 while (*args) { 387 if(!(cert = load_cert(bio_err,*args,FORMAT_PEM, 388 NULL, e, "recipient certificate file"))) { 389#if 0 /* An appropriate message is already printed */ 390 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", *args); 391#endif 392 goto end; 393 } 394 sk_X509_push(encerts, cert); 395 cert = NULL; 396 args++; 397 } 398 } 399 400 if(signerfile && (operation == SMIME_SIGN)) { 401 if(!(signer = load_cert(bio_err,signerfile,FORMAT_PEM, NULL, 402 e, "signer certificate"))) { 403#if 0 /* An appropri message has already been printed */ 404 BIO_printf(bio_err, "Can't read signer certificate file %s\n", signerfile); 405#endif 406 goto end; 407 } 408 } 409 410 if(certfile) { 411 if(!(other = load_certs(bio_err,certfile,FORMAT_PEM, NULL, 412 e, "certificate file"))) { 413#if 0 /* An appropriate message has already been printed */ 414 BIO_printf(bio_err, "Can't read certificate file %s\n", certfile); 415#endif 416 ERR_print_errors(bio_err); 417 goto end; 418 } 419 } 420 421 if(recipfile && (operation == SMIME_DECRYPT)) { 422 if(!(recip = load_cert(bio_err,recipfile,FORMAT_PEM,NULL, 423 e, "recipient certificate file"))) { 424#if 0 /* An appropriate message has alrady been printed */ 425 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", recipfile); 426#endif 427 ERR_print_errors(bio_err); 428 goto end; 429 } 430 } 431 432 if(operation == SMIME_DECRYPT) { 433 if(!keyfile) keyfile = recipfile; 434 } else if(operation == SMIME_SIGN) { 435 if(!keyfile) keyfile = signerfile; 436 } else keyfile = NULL; 437 438 if(keyfile) { 439 key = load_key(bio_err, keyfile, keyform, 0, passin, e, 440 "signing key file"); 441 if (!key) { 442 goto end; 443 } 444 } 445 446 if (infile) { 447 if (!(in = BIO_new_file(infile, inmode))) { 448 BIO_printf (bio_err, 449 "Can't open input file %s\n", infile); 450 goto end; 451 } 452 } else in = BIO_new_fp(stdin, BIO_NOCLOSE); 453 454 if (outfile) { 455 if (!(out = BIO_new_file(outfile, outmode))) { 456 BIO_printf (bio_err, 457 "Can't open output file %s\n", outfile); 458 goto end; 459 } 460 } else { 461 out = BIO_new_fp(stdout, BIO_NOCLOSE); 462#ifdef OPENSSL_SYS_VMS 463 { 464 BIO *tmpbio = BIO_new(BIO_f_linebuffer()); 465 out = BIO_push(tmpbio, out); 466 } 467#endif 468 } 469 470 if(operation == SMIME_VERIFY) { 471 if(!(store = setup_verify(bio_err, CAfile, CApath))) goto end; 472 X509_STORE_set_flags(store, store_flags); 473 } 474 475 476 ret = 3; 477 478 if(operation == SMIME_ENCRYPT) { 479 p7 = PKCS7_encrypt(encerts, in, cipher, flags); 480 } else if(operation == SMIME_SIGN) { 481 p7 = PKCS7_sign(signer, key, other, in, flags); 482 if (BIO_reset(in) != 0 && (flags & PKCS7_DETACHED)) { 483 BIO_printf(bio_err, "Can't rewind input file\n"); 484 goto end; 485 } 486 } else { 487 if(informat == FORMAT_SMIME) 488 p7 = SMIME_read_PKCS7(in, &indata); 489 else if(informat == FORMAT_PEM) 490 p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL); 491 else if(informat == FORMAT_ASN1) 492 p7 = d2i_PKCS7_bio(in, NULL); 493 else { 494 BIO_printf(bio_err, "Bad input format for PKCS#7 file\n"); 495 goto end; 496 } 497 498 if(!p7) { 499 BIO_printf(bio_err, "Error reading S/MIME message\n"); 500 goto end; 501 } 502 if(contfile) { 503 BIO_free(indata); 504 if(!(indata = BIO_new_file(contfile, "rb"))) { 505 BIO_printf(bio_err, "Can't read content file %s\n", contfile); 506 goto end; 507 } 508 } 509 } 510 511 if(!p7) { 512 BIO_printf(bio_err, "Error creating PKCS#7 structure\n"); 513 goto end; 514 } 515 516 ret = 4; 517 if(operation == SMIME_DECRYPT) { 518 if(!PKCS7_decrypt(p7, key, recip, out, flags)) { 519 BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n"); 520 goto end; 521 } 522 } else if(operation == SMIME_VERIFY) { 523 STACK_OF(X509) *signers; 524 if(PKCS7_verify(p7, other, store, indata, out, flags)) { 525 BIO_printf(bio_err, "Verification successful\n"); 526 } else { 527 BIO_printf(bio_err, "Verification failure\n"); 528 goto end; 529 } 530 signers = PKCS7_get0_signers(p7, other, flags); 531 if(!save_certs(signerfile, signers)) { 532 BIO_printf(bio_err, "Error writing signers to %s\n", 533 signerfile); 534 ret = 5; 535 goto end; 536 } 537 sk_X509_free(signers); 538 } else if(operation == SMIME_PK7OUT) { 539 PEM_write_bio_PKCS7(out, p7); 540 } else { 541 if(to) BIO_printf(out, "To: %s\n", to); 542 if(from) BIO_printf(out, "From: %s\n", from); 543 if(subject) BIO_printf(out, "Subject: %s\n", subject); 544 if(outformat == FORMAT_SMIME) 545 SMIME_write_PKCS7(out, p7, in, flags); 546 else if(outformat == FORMAT_PEM) 547 PEM_write_bio_PKCS7(out,p7); 548 else if(outformat == FORMAT_ASN1) 549 i2d_PKCS7_bio(out,p7); 550 else { 551 BIO_printf(bio_err, "Bad output format for PKCS#7 file\n"); 552 goto end; 553 } 554 } 555 ret = 0; 556end: 557 if (need_rand) 558 app_RAND_write_file(NULL, bio_err); 559 if(ret) ERR_print_errors(bio_err); 560 sk_X509_pop_free(encerts, X509_free); 561 sk_X509_pop_free(other, X509_free); 562 X509_STORE_free(store); 563 X509_free(cert); 564 X509_free(recip); 565 X509_free(signer); 566 EVP_PKEY_free(key); 567 PKCS7_free(p7); 568 BIO_free(in); 569 BIO_free(indata); 570 BIO_free_all(out); 571 if(passin) OPENSSL_free(passin); 572 return (ret); 573} 574 575static int save_certs(char *signerfile, STACK_OF(X509) *signers) 576{ 577 int i; 578 BIO *tmp; 579 if(!signerfile) return 1; 580 tmp = BIO_new_file(signerfile, "w"); 581 if(!tmp) return 0; 582 for(i = 0; i < sk_X509_num(signers); i++) 583 PEM_write_bio_X509(tmp, sk_X509_value(signers, i)); 584 BIO_free(tmp); 585 return 1; 586} 587 588