smime.c revision 59191
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 *load_cert(char *file); 71static EVP_PKEY *load_key(char *file, char *pass); 72static STACK_OF(X509) *load_certs(char *file); 73static X509_STORE *setup_verify(char *CAfile, char *CApath); 74static int save_certs(char *signerfile, STACK_OF(X509) *signers); 75 76#define SMIME_OP 0x10 77#define SMIME_ENCRYPT (1 | SMIME_OP) 78#define SMIME_DECRYPT 2 79#define SMIME_SIGN (3 | SMIME_OP) 80#define SMIME_VERIFY 4 81#define SMIME_PK7OUT 5 82 83int MAIN(int, char **); 84 85int MAIN(int argc, char **argv) 86{ 87 int operation = 0; 88 int ret = 0; 89 char **args; 90 char *inmode = "r", *outmode = "w"; 91 char *infile = NULL, *outfile = NULL; 92 char *signerfile = NULL, *recipfile = NULL; 93 char *certfile = NULL, *keyfile = NULL; 94 EVP_CIPHER *cipher = NULL; 95 PKCS7 *p7 = NULL; 96 X509_STORE *store = NULL; 97 X509 *cert = NULL, *recip = NULL, *signer = NULL; 98 EVP_PKEY *key = NULL; 99 STACK_OF(X509) *encerts = NULL, *other = NULL; 100 BIO *in = NULL, *out = NULL, *indata = NULL; 101 int badarg = 0; 102 int flags = PKCS7_DETACHED; 103 char *to = NULL, *from = NULL, *subject = NULL; 104 char *CAfile = NULL, *CApath = NULL; 105 char *passargin = NULL, *passin = NULL; 106 char *inrand = NULL; 107 int need_rand = 0; 108 args = argv + 1; 109 110 ret = 1; 111 112 while (!badarg && *args && *args[0] == '-') { 113 if (!strcmp (*args, "-encrypt")) operation = SMIME_ENCRYPT; 114 else if (!strcmp (*args, "-decrypt")) operation = SMIME_DECRYPT; 115 else if (!strcmp (*args, "-sign")) operation = SMIME_SIGN; 116 else if (!strcmp (*args, "-verify")) operation = SMIME_VERIFY; 117 else if (!strcmp (*args, "-pk7out")) operation = SMIME_PK7OUT; 118#ifndef NO_DES 119 else if (!strcmp (*args, "-des3")) 120 cipher = EVP_des_ede3_cbc(); 121 else if (!strcmp (*args, "-des")) 122 cipher = EVP_des_cbc(); 123#endif 124#ifndef NO_RC2 125 else if (!strcmp (*args, "-rc2-40")) 126 cipher = EVP_rc2_40_cbc(); 127 else if (!strcmp (*args, "-rc2-128")) 128 cipher = EVP_rc2_cbc(); 129 else if (!strcmp (*args, "-rc2-64")) 130 cipher = EVP_rc2_64_cbc(); 131#endif 132 else if (!strcmp (*args, "-text")) 133 flags |= PKCS7_TEXT; 134 else if (!strcmp (*args, "-nointern")) 135 flags |= PKCS7_NOINTERN; 136 else if (!strcmp (*args, "-noverify")) 137 flags |= PKCS7_NOVERIFY; 138 else if (!strcmp (*args, "-nochain")) 139 flags |= PKCS7_NOCHAIN; 140 else if (!strcmp (*args, "-nocerts")) 141 flags |= PKCS7_NOCERTS; 142 else if (!strcmp (*args, "-noattr")) 143 flags |= PKCS7_NOATTR; 144 else if (!strcmp (*args, "-nodetach")) 145 flags &= ~PKCS7_DETACHED; 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, "-out")) { 212 if (args[1]) { 213 args++; 214 outfile = *args; 215 } else badarg = 1; 216 } else badarg = 1; 217 args++; 218 } 219 220 if(operation == SMIME_SIGN) { 221 if(!signerfile) { 222 BIO_printf(bio_err, "No signer certificate specified\n"); 223 badarg = 1; 224 } 225 need_rand = 1; 226 } else if(operation == SMIME_DECRYPT) { 227 if(!recipfile) { 228 BIO_printf(bio_err, "No recipient certificate and key specified\n"); 229 badarg = 1; 230 } 231 } else if(operation == SMIME_ENCRYPT) { 232 if(!*args) { 233 BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n"); 234 badarg = 1; 235 } 236 need_rand = 1; 237 } else if(!operation) badarg = 1; 238 239 if (badarg) { 240 BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n"); 241 BIO_printf (bio_err, "where options are\n"); 242 BIO_printf (bio_err, "-encrypt encrypt message\n"); 243 BIO_printf (bio_err, "-decrypt decrypt encrypted message\n"); 244 BIO_printf (bio_err, "-sign sign message\n"); 245 BIO_printf (bio_err, "-verify verify signed message\n"); 246 BIO_printf (bio_err, "-pk7out output PKCS#7 structure\n"); 247#ifndef NO_DES 248 BIO_printf (bio_err, "-des3 encrypt with triple DES\n"); 249 BIO_printf (bio_err, "-des encrypt with DES\n"); 250#endif 251#ifndef NO_RC2 252 BIO_printf (bio_err, "-rc2-40 encrypt with RC2-40 (default)\n"); 253 BIO_printf (bio_err, "-rc2-64 encrypt with RC2-64\n"); 254 BIO_printf (bio_err, "-rc2-128 encrypt with RC2-128\n"); 255#endif 256 BIO_printf (bio_err, "-nointern don't search certificates in message for signer\n"); 257 BIO_printf (bio_err, "-nosigs don't verify message signature\n"); 258 BIO_printf (bio_err, "-noverify don't verify signers certificate\n"); 259 BIO_printf (bio_err, "-nocerts don't include signers certificate when signing\n"); 260 BIO_printf (bio_err, "-nodetach use opaque signing\n"); 261 BIO_printf (bio_err, "-noattr don't include any signed attributes\n"); 262 BIO_printf (bio_err, "-binary don't translate message to text\n"); 263 BIO_printf (bio_err, "-certfile file other certificates file\n"); 264 BIO_printf (bio_err, "-signer file signer certificate file\n"); 265 BIO_printf (bio_err, "-recip file recipient certificate file for decryption\n"); 266 BIO_printf (bio_err, "-in file input file\n"); 267 BIO_printf (bio_err, "-inkey file input private key (if not signer or recipient)\n"); 268 BIO_printf (bio_err, "-out file output file\n"); 269 BIO_printf (bio_err, "-to addr to address\n"); 270 BIO_printf (bio_err, "-from ad from address\n"); 271 BIO_printf (bio_err, "-subject s subject\n"); 272 BIO_printf (bio_err, "-text include or delete text MIME headers\n"); 273 BIO_printf (bio_err, "-CApath dir trusted certificates directory\n"); 274 BIO_printf (bio_err, "-CAfile file trusted certificates file\n"); 275 BIO_printf(bio_err, "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR); 276 BIO_printf(bio_err, " load the file (or the files in the directory) into\n"); 277 BIO_printf(bio_err, " the random number generator\n"); 278 BIO_printf (bio_err, "cert.pem recipient certificate(s) for encryption\n"); 279 goto end; 280 } 281 282 if(!app_passwd(bio_err, passargin, NULL, &passin, NULL)) { 283 BIO_printf(bio_err, "Error getting password\n"); 284 goto end; 285 } 286 287 if (need_rand) { 288 app_RAND_load_file(NULL, bio_err, (inrand != NULL)); 289 if (inrand != NULL) 290 BIO_printf(bio_err,"%ld semi-random bytes loaded\n", 291 app_RAND_load_files(inrand)); 292 } 293 294 ret = 2; 295 296 if(operation != SMIME_SIGN) flags &= ~PKCS7_DETACHED; 297 298 if(flags & PKCS7_BINARY) { 299 if(operation & SMIME_OP) inmode = "rb"; 300 else outmode = "rb"; 301 } 302 303 if(operation == SMIME_ENCRYPT) { 304 if (!cipher) { 305#ifndef NO_RC2 306 cipher = EVP_rc2_40_cbc(); 307#else 308 BIO_printf(bio_err, "No cipher selected\n"); 309 goto end; 310#endif 311 } 312 encerts = sk_X509_new_null(); 313 while (*args) { 314 if(!(cert = load_cert(*args))) { 315 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", *args); 316 goto end; 317 } 318 sk_X509_push(encerts, cert); 319 cert = NULL; 320 args++; 321 } 322 } 323 324 if(signerfile && (operation == SMIME_SIGN)) { 325 if(!(signer = load_cert(signerfile))) { 326 BIO_printf(bio_err, "Can't read signer certificate file %s\n", signerfile); 327 goto end; 328 } 329 } 330 331 if(certfile) { 332 if(!(other = load_certs(certfile))) { 333 BIO_printf(bio_err, "Can't read certificate file %s\n", certfile); 334 ERR_print_errors(bio_err); 335 goto end; 336 } 337 } 338 339 if(recipfile && (operation == SMIME_DECRYPT)) { 340 if(!(recip = load_cert(recipfile))) { 341 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", recipfile); 342 ERR_print_errors(bio_err); 343 goto end; 344 } 345 } 346 347 if(operation == SMIME_DECRYPT) { 348 if(!keyfile) keyfile = recipfile; 349 } else if(operation == SMIME_SIGN) { 350 if(!keyfile) keyfile = signerfile; 351 } else keyfile = NULL; 352 353 if(keyfile) { 354 if(!(key = load_key(keyfile, passin))) { 355 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", keyfile); 356 ERR_print_errors(bio_err); 357 goto end; 358 } 359 } 360 361 if (infile) { 362 if (!(in = BIO_new_file(infile, inmode))) { 363 BIO_printf (bio_err, 364 "Can't open input file %s\n", infile); 365 goto end; 366 } 367 } else in = BIO_new_fp(stdin, BIO_NOCLOSE); 368 369 if (outfile) { 370 if (!(out = BIO_new_file(outfile, outmode))) { 371 BIO_printf (bio_err, 372 "Can't open output file %s\n", outfile); 373 goto end; 374 } 375 } else out = BIO_new_fp(stdout, BIO_NOCLOSE); 376 377 if(operation == SMIME_VERIFY) { 378 if(!(store = setup_verify(CAfile, CApath))) goto end; 379 } 380 381 ret = 3; 382 383 if(operation == SMIME_ENCRYPT) { 384 p7 = PKCS7_encrypt(encerts, in, cipher, flags); 385 } else if(operation == SMIME_SIGN) { 386 p7 = PKCS7_sign(signer, key, other, in, flags); 387 BIO_reset(in); 388 } else { 389 if(!(p7 = SMIME_read_PKCS7(in, &indata))) { 390 BIO_printf(bio_err, "Error reading S/MIME message\n"); 391 goto end; 392 } 393 } 394 395 if(!p7) { 396 BIO_printf(bio_err, "Error creating PKCS#7 structure\n"); 397 goto end; 398 } 399 400 ret = 4; 401 if(operation == SMIME_DECRYPT) { 402 if(!PKCS7_decrypt(p7, key, recip, out, flags)) { 403 BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n"); 404 goto end; 405 } 406 } else if(operation == SMIME_VERIFY) { 407 STACK_OF(X509) *signers; 408 if(PKCS7_verify(p7, other, store, indata, out, flags)) { 409 BIO_printf(bio_err, "Verification Successful\n"); 410 } else { 411 BIO_printf(bio_err, "Verification Failure\n"); 412 goto end; 413 } 414 signers = PKCS7_get0_signers(p7, other, flags); 415 if(!save_certs(signerfile, signers)) { 416 BIO_printf(bio_err, "Error writing signers to %s\n", 417 signerfile); 418 ret = 5; 419 goto end; 420 } 421 sk_X509_free(signers); 422 } else if(operation == SMIME_PK7OUT) { 423 PEM_write_bio_PKCS7(out, p7); 424 } else { 425 if(to) BIO_printf(out, "To: %s\n", to); 426 if(from) BIO_printf(out, "From: %s\n", from); 427 if(subject) BIO_printf(out, "Subject: %s\n", subject); 428 SMIME_write_PKCS7(out, p7, in, flags); 429 } 430 ret = 0; 431end: 432 if (need_rand) 433 app_RAND_write_file(NULL, bio_err); 434 if(ret) ERR_print_errors(bio_err); 435 sk_X509_pop_free(encerts, X509_free); 436 sk_X509_pop_free(other, X509_free); 437 X509_STORE_free(store); 438 X509_free(cert); 439 X509_free(recip); 440 X509_free(signer); 441 EVP_PKEY_free(key); 442 PKCS7_free(p7); 443 BIO_free(in); 444 BIO_free(indata); 445 BIO_free(out); 446 if(passin) Free(passin); 447 return (ret); 448} 449 450static X509 *load_cert(char *file) 451{ 452 BIO *in; 453 X509 *cert; 454 if(!(in = BIO_new_file(file, "r"))) return NULL; 455 cert = PEM_read_bio_X509(in, NULL, NULL,NULL); 456 BIO_free(in); 457 return cert; 458} 459 460static EVP_PKEY *load_key(char *file, char *pass) 461{ 462 BIO *in; 463 EVP_PKEY *key; 464 if(!(in = BIO_new_file(file, "r"))) return NULL; 465 key = PEM_read_bio_PrivateKey(in, NULL,NULL,pass); 466 BIO_free(in); 467 return key; 468} 469 470static STACK_OF(X509) *load_certs(char *file) 471{ 472 BIO *in; 473 int i; 474 STACK_OF(X509) *othercerts; 475 STACK_OF(X509_INFO) *allcerts; 476 X509_INFO *xi; 477 if(!(in = BIO_new_file(file, "r"))) return NULL; 478 othercerts = sk_X509_new(NULL); 479 if(!othercerts) return NULL; 480 allcerts = PEM_X509_INFO_read_bio(in, NULL, NULL, NULL); 481 for(i = 0; i < sk_X509_INFO_num(allcerts); i++) { 482 xi = sk_X509_INFO_value (allcerts, i); 483 if (xi->x509) { 484 sk_X509_push(othercerts, xi->x509); 485 xi->x509 = NULL; 486 } 487 } 488 sk_X509_INFO_pop_free(allcerts, X509_INFO_free); 489 BIO_free(in); 490 return othercerts; 491} 492 493static X509_STORE *setup_verify(char *CAfile, char *CApath) 494{ 495 X509_STORE *store; 496 X509_LOOKUP *lookup; 497 if(!(store = X509_STORE_new())) goto end; 498 lookup=X509_STORE_add_lookup(store,X509_LOOKUP_file()); 499 if (lookup == NULL) goto end; 500 if (CAfile) { 501 if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) { 502 BIO_printf(bio_err, "Error loading file %s\n", CAfile); 503 goto end; 504 } 505 } else X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT); 506 507 lookup=X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir()); 508 if (lookup == NULL) goto end; 509 if (CApath) { 510 if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) { 511 BIO_printf(bio_err, "Error loading directory %s\n", CApath); 512 goto end; 513 } 514 } else X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT); 515 516 ERR_clear_error(); 517 return store; 518 end: 519 X509_STORE_free(store); 520 return NULL; 521} 522 523static int save_certs(char *signerfile, STACK_OF(X509) *signers) 524{ 525 int i; 526 BIO *tmp; 527 if(!signerfile) return 1; 528 tmp = BIO_new_file(signerfile, "w"); 529 if(!tmp) return 0; 530 for(i = 0; i < sk_X509_num(signers); i++) 531 PEM_write_bio_X509(tmp, sk_X509_value(signers, i)); 532 BIO_free(tmp); 533 return 1; 534} 535 536