smime.c revision 79998
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 X509_STORE *setup_verify(char *CAfile, char *CApath); 71static int save_certs(char *signerfile, STACK_OF(X509) *signers); 72 73#define SMIME_OP 0x10 74#define SMIME_ENCRYPT (1 | SMIME_OP) 75#define SMIME_DECRYPT 2 76#define SMIME_SIGN (3 | SMIME_OP) 77#define SMIME_VERIFY 4 78#define SMIME_PK7OUT 5 79 80int MAIN(int, char **); 81 82int MAIN(int argc, char **argv) 83{ 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 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; 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 args = argv + 1; 107 108 ret = 1; 109 110 while (!badarg && *args && *args[0] == '-') { 111 if (!strcmp (*args, "-encrypt")) operation = SMIME_ENCRYPT; 112 else if (!strcmp (*args, "-decrypt")) operation = SMIME_DECRYPT; 113 else if (!strcmp (*args, "-sign")) operation = SMIME_SIGN; 114 else if (!strcmp (*args, "-verify")) operation = SMIME_VERIFY; 115 else if (!strcmp (*args, "-pk7out")) operation = SMIME_PK7OUT; 116#ifndef NO_DES 117 else if (!strcmp (*args, "-des3")) 118 cipher = EVP_des_ede3_cbc(); 119 else if (!strcmp (*args, "-des")) 120 cipher = EVP_des_cbc(); 121#endif 122#ifndef NO_RC2 123 else if (!strcmp (*args, "-rc2-40")) 124 cipher = EVP_rc2_40_cbc(); 125 else if (!strcmp (*args, "-rc2-128")) 126 cipher = EVP_rc2_cbc(); 127 else if (!strcmp (*args, "-rc2-64")) 128 cipher = EVP_rc2_64_cbc(); 129#endif 130 else if (!strcmp (*args, "-text")) 131 flags |= PKCS7_TEXT; 132 else if (!strcmp (*args, "-nointern")) 133 flags |= PKCS7_NOINTERN; 134 else if (!strcmp (*args, "-noverify")) 135 flags |= PKCS7_NOVERIFY; 136 else if (!strcmp (*args, "-nochain")) 137 flags |= PKCS7_NOCHAIN; 138 else if (!strcmp (*args, "-nocerts")) 139 flags |= PKCS7_NOCERTS; 140 else if (!strcmp (*args, "-noattr")) 141 flags |= PKCS7_NOATTR; 142 else if (!strcmp (*args, "-nodetach")) 143 flags &= ~PKCS7_DETACHED; 144 else if (!strcmp (*args, "-nosmimecap")) 145 flags |= PKCS7_NOSMIMECAP; 146 else if (!strcmp (*args, "-binary")) 147 flags |= PKCS7_BINARY; 148 else if (!strcmp (*args, "-nosigs")) 149 flags |= PKCS7_NOSIGS; 150 else if (!strcmp(*args,"-rand")) { 151 if (args[1]) { 152 args++; 153 inrand = *args; 154 } else badarg = 1; 155 need_rand = 1; 156 } else if (!strcmp(*args,"-passin")) { 157 if (args[1]) { 158 args++; 159 passargin = *args; 160 } else badarg = 1; 161 } else if (!strcmp (*args, "-to")) { 162 if (args[1]) { 163 args++; 164 to = *args; 165 } else badarg = 1; 166 } else if (!strcmp (*args, "-from")) { 167 if (args[1]) { 168 args++; 169 from = *args; 170 } else badarg = 1; 171 } else if (!strcmp (*args, "-subject")) { 172 if (args[1]) { 173 args++; 174 subject = *args; 175 } else badarg = 1; 176 } else if (!strcmp (*args, "-signer")) { 177 if (args[1]) { 178 args++; 179 signerfile = *args; 180 } else badarg = 1; 181 } else if (!strcmp (*args, "-recip")) { 182 if (args[1]) { 183 args++; 184 recipfile = *args; 185 } else badarg = 1; 186 } else if (!strcmp (*args, "-inkey")) { 187 if (args[1]) { 188 args++; 189 keyfile = *args; 190 } else badarg = 1; 191 } else if (!strcmp (*args, "-certfile")) { 192 if (args[1]) { 193 args++; 194 certfile = *args; 195 } else badarg = 1; 196 } else if (!strcmp (*args, "-CAfile")) { 197 if (args[1]) { 198 args++; 199 CAfile = *args; 200 } else badarg = 1; 201 } else if (!strcmp (*args, "-CApath")) { 202 if (args[1]) { 203 args++; 204 CApath = *args; 205 } else badarg = 1; 206 } else if (!strcmp (*args, "-in")) { 207 if (args[1]) { 208 args++; 209 infile = *args; 210 } else badarg = 1; 211 } else if (!strcmp (*args, "-inform")) { 212 if (args[1]) { 213 args++; 214 informat = str2fmt(*args); 215 } else badarg = 1; 216 } else if (!strcmp (*args, "-outform")) { 217 if (args[1]) { 218 args++; 219 outformat = str2fmt(*args); 220 } else badarg = 1; 221 } else if (!strcmp (*args, "-out")) { 222 if (args[1]) { 223 args++; 224 outfile = *args; 225 } else badarg = 1; 226 } else if (!strcmp (*args, "-content")) { 227 if (args[1]) { 228 args++; 229 contfile = *args; 230 } else badarg = 1; 231 } else badarg = 1; 232 args++; 233 } 234 235 if(operation == SMIME_SIGN) { 236 if(!signerfile) { 237 BIO_printf(bio_err, "No signer certificate specified\n"); 238 badarg = 1; 239 } 240 need_rand = 1; 241 } else if(operation == SMIME_DECRYPT) { 242 if(!recipfile) { 243 BIO_printf(bio_err, "No recipient certificate and key specified\n"); 244 badarg = 1; 245 } 246 } else if(operation == SMIME_ENCRYPT) { 247 if(!*args) { 248 BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n"); 249 badarg = 1; 250 } 251 need_rand = 1; 252 } else if(!operation) badarg = 1; 253 254 if (badarg) { 255 BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n"); 256 BIO_printf (bio_err, "where options are\n"); 257 BIO_printf (bio_err, "-encrypt encrypt message\n"); 258 BIO_printf (bio_err, "-decrypt decrypt encrypted message\n"); 259 BIO_printf (bio_err, "-sign sign message\n"); 260 BIO_printf (bio_err, "-verify verify signed message\n"); 261 BIO_printf (bio_err, "-pk7out output PKCS#7 structure\n"); 262#ifndef NO_DES 263 BIO_printf (bio_err, "-des3 encrypt with triple DES\n"); 264 BIO_printf (bio_err, "-des encrypt with DES\n"); 265#endif 266#ifndef NO_RC2 267 BIO_printf (bio_err, "-rc2-40 encrypt with RC2-40 (default)\n"); 268 BIO_printf (bio_err, "-rc2-64 encrypt with RC2-64\n"); 269 BIO_printf (bio_err, "-rc2-128 encrypt with RC2-128\n"); 270#endif 271 BIO_printf (bio_err, "-nointern don't search certificates in message for signer\n"); 272 BIO_printf (bio_err, "-nosigs don't verify message signature\n"); 273 BIO_printf (bio_err, "-noverify don't verify signers certificate\n"); 274 BIO_printf (bio_err, "-nocerts don't include signers certificate when signing\n"); 275 BIO_printf (bio_err, "-nodetach use opaque signing\n"); 276 BIO_printf (bio_err, "-noattr don't include any signed attributes\n"); 277 BIO_printf (bio_err, "-binary don't translate message to text\n"); 278 BIO_printf (bio_err, "-certfile file other certificates file\n"); 279 BIO_printf (bio_err, "-signer file signer certificate file\n"); 280 BIO_printf (bio_err, "-recip file recipient certificate file for decryption\n"); 281 BIO_printf (bio_err, "-in file input file\n"); 282 BIO_printf (bio_err, "-inform arg input format SMIME (default), PEM or DER\n"); 283 BIO_printf (bio_err, "-inkey file input private key (if not signer or recipient)\n"); 284 BIO_printf (bio_err, "-out file output file\n"); 285 BIO_printf (bio_err, "-outform arg output format SMIME (default), PEM or DER\n"); 286 BIO_printf (bio_err, "-content file supply or override content for detached signature\n"); 287 BIO_printf (bio_err, "-to addr to address\n"); 288 BIO_printf (bio_err, "-from ad from address\n"); 289 BIO_printf (bio_err, "-subject s subject\n"); 290 BIO_printf (bio_err, "-text include or delete text MIME headers\n"); 291 BIO_printf (bio_err, "-CApath dir trusted certificates directory\n"); 292 BIO_printf (bio_err, "-CAfile file trusted certificates file\n"); 293 BIO_printf (bio_err, "-passin arg input file pass phrase source\n"); 294 BIO_printf(bio_err, "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR); 295 BIO_printf(bio_err, " load the file (or the files in the directory) into\n"); 296 BIO_printf(bio_err, " the random number generator\n"); 297 BIO_printf (bio_err, "cert.pem recipient certificate(s) for encryption\n"); 298 goto end; 299 } 300 301 if(!app_passwd(bio_err, passargin, NULL, &passin, NULL)) { 302 BIO_printf(bio_err, "Error getting password\n"); 303 goto end; 304 } 305 306 if (need_rand) { 307 app_RAND_load_file(NULL, bio_err, (inrand != NULL)); 308 if (inrand != NULL) 309 BIO_printf(bio_err,"%ld semi-random bytes loaded\n", 310 app_RAND_load_files(inrand)); 311 } 312 313 ret = 2; 314 315 if(operation != SMIME_SIGN) flags &= ~PKCS7_DETACHED; 316 317 if(operation & SMIME_OP) { 318 if(flags & PKCS7_BINARY) inmode = "rb"; 319 if(outformat == FORMAT_ASN1) outmode = "wb"; 320 } else { 321 if(flags & PKCS7_BINARY) outmode = "wb"; 322 if(informat == FORMAT_ASN1) inmode = "rb"; 323 } 324 325 if(operation == SMIME_ENCRYPT) { 326 if (!cipher) { 327#ifndef NO_RC2 328 cipher = EVP_rc2_40_cbc(); 329#else 330 BIO_printf(bio_err, "No cipher selected\n"); 331 goto end; 332#endif 333 } 334 encerts = sk_X509_new_null(); 335 while (*args) { 336 if(!(cert = load_cert(bio_err,*args,FORMAT_PEM))) { 337 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", *args); 338 goto end; 339 } 340 sk_X509_push(encerts, cert); 341 cert = NULL; 342 args++; 343 } 344 } 345 346 if(signerfile && (operation == SMIME_SIGN)) { 347 if(!(signer = load_cert(bio_err,signerfile,FORMAT_PEM))) { 348 BIO_printf(bio_err, "Can't read signer certificate file %s\n", signerfile); 349 goto end; 350 } 351 } 352 353 if(certfile) { 354 if(!(other = load_certs(bio_err,certfile,FORMAT_PEM))) { 355 BIO_printf(bio_err, "Can't read certificate file %s\n", certfile); 356 ERR_print_errors(bio_err); 357 goto end; 358 } 359 } 360 361 if(recipfile && (operation == SMIME_DECRYPT)) { 362 if(!(recip = load_cert(bio_err,recipfile,FORMAT_PEM))) { 363 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", recipfile); 364 ERR_print_errors(bio_err); 365 goto end; 366 } 367 } 368 369 if(operation == SMIME_DECRYPT) { 370 if(!keyfile) keyfile = recipfile; 371 } else if(operation == SMIME_SIGN) { 372 if(!keyfile) keyfile = signerfile; 373 } else keyfile = NULL; 374 375 if(keyfile) { 376 if(!(key = load_key(bio_err,keyfile, FORMAT_PEM, passin))) { 377 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", keyfile); 378 ERR_print_errors(bio_err); 379 goto end; 380 } 381 } 382 383 if (infile) { 384 if (!(in = BIO_new_file(infile, inmode))) { 385 BIO_printf (bio_err, 386 "Can't open input file %s\n", infile); 387 goto end; 388 } 389 } else in = BIO_new_fp(stdin, BIO_NOCLOSE); 390 391 if (outfile) { 392 if (!(out = BIO_new_file(outfile, outmode))) { 393 BIO_printf (bio_err, 394 "Can't open output file %s\n", outfile); 395 goto end; 396 } 397 } else { 398 out = BIO_new_fp(stdout, BIO_NOCLOSE); 399#ifdef VMS 400 { 401 BIO *tmpbio = BIO_new(BIO_f_linebuffer()); 402 out = BIO_push(tmpbio, out); 403 } 404#endif 405 } 406 407 if(operation == SMIME_VERIFY) { 408 if(!(store = setup_verify(CAfile, CApath))) goto end; 409 } 410 411 ret = 3; 412 413 if(operation == SMIME_ENCRYPT) { 414 p7 = PKCS7_encrypt(encerts, in, cipher, flags); 415 } else if(operation == SMIME_SIGN) { 416 p7 = PKCS7_sign(signer, key, other, in, flags); 417 BIO_reset(in); 418 } else { 419 if(informat == FORMAT_SMIME) 420 p7 = SMIME_read_PKCS7(in, &indata); 421 else if(informat == FORMAT_PEM) 422 p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL); 423 else if(informat == FORMAT_ASN1) 424 p7 = d2i_PKCS7_bio(in, NULL); 425 else { 426 BIO_printf(bio_err, "Bad input format for PKCS#7 file\n"); 427 goto end; 428 } 429 430 if(!p7) { 431 BIO_printf(bio_err, "Error reading S/MIME message\n"); 432 goto end; 433 } 434 if(contfile) { 435 BIO_free(indata); 436 if(!(indata = BIO_new_file(contfile, "rb"))) { 437 BIO_printf(bio_err, "Can't read content file %s\n", contfile); 438 goto end; 439 } 440 } 441 } 442 443 if(!p7) { 444 BIO_printf(bio_err, "Error creating PKCS#7 structure\n"); 445 goto end; 446 } 447 448 ret = 4; 449 if(operation == SMIME_DECRYPT) { 450 if(!PKCS7_decrypt(p7, key, recip, out, flags)) { 451 BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n"); 452 goto end; 453 } 454 } else if(operation == SMIME_VERIFY) { 455 STACK_OF(X509) *signers; 456 if(PKCS7_verify(p7, other, store, indata, out, flags)) { 457 BIO_printf(bio_err, "Verification Successful\n"); 458 } else { 459 BIO_printf(bio_err, "Verification Failure\n"); 460 goto end; 461 } 462 signers = PKCS7_get0_signers(p7, other, flags); 463 if(!save_certs(signerfile, signers)) { 464 BIO_printf(bio_err, "Error writing signers to %s\n", 465 signerfile); 466 ret = 5; 467 goto end; 468 } 469 sk_X509_free(signers); 470 } else if(operation == SMIME_PK7OUT) { 471 PEM_write_bio_PKCS7(out, p7); 472 } else { 473 if(to) BIO_printf(out, "To: %s\n", to); 474 if(from) BIO_printf(out, "From: %s\n", from); 475 if(subject) BIO_printf(out, "Subject: %s\n", subject); 476 if(outformat == FORMAT_SMIME) 477 SMIME_write_PKCS7(out, p7, in, flags); 478 else if(outformat == FORMAT_PEM) 479 PEM_write_bio_PKCS7(out,p7); 480 else if(outformat == FORMAT_ASN1) 481 i2d_PKCS7_bio(out,p7); 482 else { 483 BIO_printf(bio_err, "Bad output format for PKCS#7 file\n"); 484 goto end; 485 } 486 } 487 ret = 0; 488end: 489 if (need_rand) 490 app_RAND_write_file(NULL, bio_err); 491 if(ret) ERR_print_errors(bio_err); 492 sk_X509_pop_free(encerts, X509_free); 493 sk_X509_pop_free(other, X509_free); 494 X509_STORE_free(store); 495 X509_free(cert); 496 X509_free(recip); 497 X509_free(signer); 498 EVP_PKEY_free(key); 499 PKCS7_free(p7); 500 BIO_free(in); 501 BIO_free(indata); 502 BIO_free_all(out); 503 if(passin) OPENSSL_free(passin); 504 return (ret); 505} 506 507static X509_STORE *setup_verify(char *CAfile, char *CApath) 508{ 509 X509_STORE *store; 510 X509_LOOKUP *lookup; 511 if(!(store = X509_STORE_new())) goto end; 512 lookup=X509_STORE_add_lookup(store,X509_LOOKUP_file()); 513 if (lookup == NULL) goto end; 514 if (CAfile) { 515 if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) { 516 BIO_printf(bio_err, "Error loading file %s\n", CAfile); 517 goto end; 518 } 519 } else X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT); 520 521 lookup=X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir()); 522 if (lookup == NULL) goto end; 523 if (CApath) { 524 if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) { 525 BIO_printf(bio_err, "Error loading directory %s\n", CApath); 526 goto end; 527 } 528 } else X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT); 529 530 ERR_clear_error(); 531 return store; 532 end: 533 X509_STORE_free(store); 534 return NULL; 535} 536 537static int save_certs(char *signerfile, STACK_OF(X509) *signers) 538{ 539 int i; 540 BIO *tmp; 541 if(!signerfile) return 1; 542 tmp = BIO_new_file(signerfile, "w"); 543 if(!tmp) return 0; 544 for(i = 0; i < sk_X509_num(signers); i++) 545 PEM_write_bio_X509(tmp, sk_X509_value(signers, i)); 546 BIO_free(tmp); 547 return 1; 548} 549 550