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 70 static X509_STORE *setup_verify(char *CAfile, char *CApath); 71 static 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 80 int MAIN(int, char **); 81 82 int 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, "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR); 294 BIO_printf(bio_err, " load the file (or the files in the directory) into\n"); 295 BIO_printf(bio_err, " the random number generator\n"); 296 BIO_printf (bio_err, "cert.pem recipient certificate(s) for encryption\n"); 297 goto end; 298 } 299 300 if(!app_passwd(bio_err, passargin, NULL, &passin, NULL)) { 301 BIO_printf(bio_err, "Error getting password\n"); 302 goto end; 303 } 304 305 if (need_rand) { 306 app_RAND_load_file(NULL, bio_err, (inrand != NULL)); 307 if (inrand != NULL) 308 BIO_printf(bio_err,"%ld semi-random bytes loaded\n", 309 app_RAND_load_files(inrand)); 310 } 311 312 ret = 2; 313 314 if(operation != SMIME_SIGN) flags &= ~PKCS7_DETACHED; 315 316 if(operation & SMIME_OP) { 317 if(flags & PKCS7_BINARY) inmode = "rb"; 318 if(outformat == FORMAT_ASN1) outmode = "wb"; 319 } else { 320 if(flags & PKCS7_BINARY) outmode = "wb"; 321 if(informat == FORMAT_ASN1) inmode = "rb"; 322 } 323 324 if(operation == SMIME_ENCRYPT) { 325 if (!cipher) { 326 #ifndef NO_RC2 327 cipher = EVP_rc2_40_cbc(); 328 #else 329 BIO_printf(bio_err, "No cipher selected\n"); 330 goto end; 331 #endif 332 } 333 encerts = sk_X509_new_null(); 334 while (*args) { 335 if(!(cert = load_cert(bio_err,*args,FORMAT_PEM))) { 336 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", *args); 337 goto end; 338 } 339 sk_X509_push(encerts, cert); 340 cert = NULL; 341 args++; 342 } 343 } 344 345 if(signerfile && (operation == SMIME_SIGN)) { 346 if(!(signer = load_cert(bio_err,signerfile,FORMAT_PEM))) { 347 BIO_printf(bio_err, "Can't read signer certificate file %s\n", signerfile); 348 goto end; 349 } 350 } 351 352 if(certfile) { 353 if(!(other = load_certs(bio_err,certfile,FORMAT_PEM))) { 354 BIO_printf(bio_err, "Can't read certificate file %s\n", certfile); 355 ERR_print_errors(bio_err); 356 goto end; 357 } 358 } 359 360 if(recipfile && (operation == SMIME_DECRYPT)) { 361 if(!(recip = load_cert(bio_err,recipfile,FORMAT_PEM))) { 362 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", recipfile); 363 ERR_print_errors(bio_err); 364 goto end; 365 } 366 } 367 368 if(operation == SMIME_DECRYPT) { 369 if(!keyfile) keyfile = recipfile; 370 } else if(operation == SMIME_SIGN) { 371 if(!keyfile) keyfile = signerfile; 372 } else keyfile = NULL; 373 374 if(keyfile) { 375 if(!(key = load_key(bio_err,keyfile, FORMAT_PEM, passin))) { 376 BIO_printf(bio_err, "Can't read recipient certificate file %s\n", keyfile); 377 ERR_print_errors(bio_err); 378 goto end; 379 } 380 } 381 382 if (infile) { 383 if (!(in = BIO_new_file(infile, inmode))) { 384 BIO_printf (bio_err, 385 "Can't open input file %s\n", infile); 386 goto end; 387 } 388 } else in = BIO_new_fp(stdin, BIO_NOCLOSE); 389 390 if (outfile) { 391 if (!(out = BIO_new_file(outfile, outmode))) { 392 BIO_printf (bio_err, 393 "Can't open output file %s\n", outfile); 394 goto end; 395 } 396 } else { 397 out = BIO_new_fp(stdout, BIO_NOCLOSE); 398 #ifdef VMS 399 { 400 BIO *tmpbio = BIO_new(BIO_f_linebuffer()); 401 out = BIO_push(tmpbio, out); 402 } 403 #endif 404 } 405 406 if(operation == SMIME_VERIFY) { 407 if(!(store = setup_verify(CAfile, CApath))) goto end; 408 } 409 410 ret = 3; 411 412 if(operation == SMIME_ENCRYPT) { 413 p7 = PKCS7_encrypt(encerts, in, cipher, flags); 414 } else if(operation == SMIME_SIGN) { 415 p7 = PKCS7_sign(signer, key, other, in, flags); 416 BIO_reset(in); 417 } else { 418 if(informat == FORMAT_SMIME) 419 p7 = SMIME_read_PKCS7(in, &indata); 420 else if(informat == FORMAT_PEM) 421 p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL); 422 else if(informat == FORMAT_ASN1) 423 p7 = d2i_PKCS7_bio(in, NULL); 424 else { 425 BIO_printf(bio_err, "Bad input format for PKCS#7 file\n"); 426 goto end; 427 } 428 429 if(!p7) { 430 BIO_printf(bio_err, "Error reading S/MIME message\n"); 431 goto end; 432 } 433 if(contfile) { 434 BIO_free(indata); 435 if(!(indata = BIO_new_file(contfile, "rb"))) { 436 BIO_printf(bio_err, "Can't read content file %s\n", contfile); 437 goto end; 438 } 439 } 440 } 441 442 if(!p7) { 443 BIO_printf(bio_err, "Error creating PKCS#7 structure\n"); 444 goto end; 445 } 446 447 ret = 4; 448 if(operation == SMIME_DECRYPT) { 449 if(!PKCS7_decrypt(p7, key, recip, out, flags)) { 450 BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n"); 451 goto end; 452 } 453 } else if(operation == SMIME_VERIFY) { 454 STACK_OF(X509) *signers; 455 if(PKCS7_verify(p7, other, store, indata, out, flags)) { 456 BIO_printf(bio_err, "Verification Successful\n"); 457 } else { 458 BIO_printf(bio_err, "Verification Failure\n"); 459 goto end; 460 } 461 signers = PKCS7_get0_signers(p7, other, flags); 462 if(!save_certs(signerfile, signers)) { 463 BIO_printf(bio_err, "Error writing signers to %s\n", 464 signerfile); 465 ret = 5; 466 goto end; 467 } 468 sk_X509_free(signers); 469 } else if(operation == SMIME_PK7OUT) { 470 PEM_write_bio_PKCS7(out, p7); 471 } else { 472 if(to) BIO_printf(out, "To: %s\n", to); 473 if(from) BIO_printf(out, "From: %s\n", from); 474 if(subject) BIO_printf(out, "Subject: %s\n", subject); 475 if(outformat == FORMAT_SMIME) 476 SMIME_write_PKCS7(out, p7, in, flags); 477 else if(outformat == FORMAT_PEM) 478 PEM_write_bio_PKCS7(out,p7); 479 else if(outformat == FORMAT_ASN1) 480 i2d_PKCS7_bio(out,p7); 481 else { 482 BIO_printf(bio_err, "Bad output format for PKCS#7 file\n"); 483 goto end; 484 } 485 } 486 ret = 0; 487 end: 488 if (need_rand) 489 app_RAND_write_file(NULL, bio_err); 490 if(ret) ERR_print_errors(bio_err); 491 sk_X509_pop_free(encerts, X509_free); 492 sk_X509_pop_free(other, X509_free); 493 X509_STORE_free(store); 494 X509_free(cert); 495 X509_free(recip); 496 X509_free(signer); 497 EVP_PKEY_free(key); 498 PKCS7_free(p7); 499 BIO_free(in); 500 BIO_free(indata); 501 BIO_free_all(out); 502 if(passin) OPENSSL_free(passin); 503 return (ret); 504 } 505 506 static X509_STORE *setup_verify(char *CAfile, char *CApath) 507 { 508 X509_STORE *store; 509 X509_LOOKUP *lookup; 510 if(!(store = X509_STORE_new())) goto end; 511 lookup=X509_STORE_add_lookup(store,X509_LOOKUP_file()); 512 if (lookup == NULL) goto end; 513 if (CAfile) { 514 if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) { 515 BIO_printf(bio_err, "Error loading file %s\n", CAfile); 516 goto end; 517 } 518 } else X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT); 519 520 lookup=X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir()); 521 if (lookup == NULL) goto end; 522 if (CApath) { 523 if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) { 524 BIO_printf(bio_err, "Error loading directory %s\n", CApath); 525 goto end; 526 } 527 } else X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT); 528 529 ERR_clear_error(); 530 return store; 531 end: 532 X509_STORE_free(store); 533 return NULL; 534 } 535 536 static int save_certs(char *signerfile, STACK_OF(X509) *signers) 537 { 538 int i; 539 BIO *tmp; 540 if(!signerfile) return 1; 541 tmp = BIO_new_file(signerfile, "w"); 542 if(!tmp) return 0; 543 for(i = 0; i < sk_X509_num(signers); i++) 544 PEM_write_bio_X509(tmp, sk_X509_value(signers, i)); 545 BIO_free(tmp); 546 return 1; 547 } 548 549