1/* pk7_smime.c */ 2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 3 * project. 4 */ 5/* ==================================================================== 6 * Copyright (c) 1999-2004 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/* Simple PKCS#7 processing functions */ 60 61#include <stdio.h> 62#include "cryptlib.h" 63#include <openssl/x509.h> 64#include <openssl/x509v3.h> 65 66static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si); 67 68PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs, 69 BIO *data, int flags) 70{ 71 PKCS7 *p7; 72 int i; 73 74 if(!(p7 = PKCS7_new())) 75 { 76 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE); 77 return NULL; 78 } 79 80 if (!PKCS7_set_type(p7, NID_pkcs7_signed)) 81 goto err; 82 83 if (!PKCS7_content_new(p7, NID_pkcs7_data)) 84 goto err; 85 86 if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags)) 87 { 88 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_ADD_SIGNER_ERROR); 89 goto err; 90 } 91 92 if(!(flags & PKCS7_NOCERTS)) 93 { 94 for(i = 0; i < sk_X509_num(certs); i++) 95 { 96 if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i))) 97 goto err; 98 } 99 } 100 101 if(flags & PKCS7_DETACHED) 102 PKCS7_set_detached(p7, 1); 103 104 if (flags & (PKCS7_STREAM|PKCS7_PARTIAL)) 105 return p7; 106 107 if (PKCS7_final(p7, data, flags)) 108 return p7; 109 110 err: 111 PKCS7_free(p7); 112 return NULL; 113} 114 115int PKCS7_final(PKCS7 *p7, BIO *data, int flags) 116 { 117 BIO *p7bio; 118 int ret = 0; 119 if (!(p7bio = PKCS7_dataInit(p7, NULL))) 120 { 121 PKCS7err(PKCS7_F_PKCS7_FINAL,ERR_R_MALLOC_FAILURE); 122 return 0; 123 } 124 125 SMIME_crlf_copy(data, p7bio, flags); 126 127 (void)BIO_flush(p7bio); 128 129 130 if (!PKCS7_dataFinal(p7,p7bio)) 131 { 132 PKCS7err(PKCS7_F_PKCS7_FINAL,PKCS7_R_PKCS7_DATASIGN); 133 goto err; 134 } 135 136 ret = 1; 137 138 err: 139 BIO_free_all(p7bio); 140 141 return ret; 142 143 } 144 145/* Check to see if a cipher exists and if so add S/MIME capabilities */ 146 147static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg) 148 { 149 if (EVP_get_cipherbynid(nid)) 150 return PKCS7_simple_smimecap(sk, nid, arg); 151 return 1; 152 } 153 154static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg) 155 { 156 if (EVP_get_digestbynid(nid)) 157 return PKCS7_simple_smimecap(sk, nid, arg); 158 return 1; 159 } 160 161PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert, 162 EVP_PKEY *pkey, const EVP_MD *md, 163 int flags) 164 { 165 PKCS7_SIGNER_INFO *si = NULL; 166 STACK_OF(X509_ALGOR) *smcap = NULL; 167 if(!X509_check_private_key(signcert, pkey)) 168 { 169 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER, 170 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 171 return NULL; 172 } 173 174 if (!(si = PKCS7_add_signature(p7,signcert,pkey, md))) 175 { 176 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER, 177 PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR); 178 return NULL; 179 } 180 181 if(!(flags & PKCS7_NOCERTS)) 182 { 183 if (!PKCS7_add_certificate(p7, signcert)) 184 goto err; 185 } 186 187 if(!(flags & PKCS7_NOATTR)) 188 { 189 if (!PKCS7_add_attrib_content_type(si, NULL)) 190 goto err; 191 /* Add SMIMECapabilities */ 192 if(!(flags & PKCS7_NOSMIMECAP)) 193 { 194 if(!(smcap = sk_X509_ALGOR_new_null())) 195 { 196 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER, 197 ERR_R_MALLOC_FAILURE); 198 goto err; 199 } 200 if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1) 201 || !add_digest_smcap(smcap, NID_id_GostR3411_94, -1) 202 || !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1) 203 || !add_cipher_smcap(smcap, NID_aes_192_cbc, -1) 204 || !add_cipher_smcap(smcap, NID_aes_128_cbc, -1) 205 || !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1) 206 || !add_cipher_smcap(smcap, NID_rc2_cbc, 128) 207 || !add_cipher_smcap(smcap, NID_rc2_cbc, 64) 208 || !add_cipher_smcap(smcap, NID_des_cbc, -1) 209 || !add_cipher_smcap(smcap, NID_rc2_cbc, 40) 210 || !PKCS7_add_attrib_smimecap (si, smcap)) 211 goto err; 212 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free); 213 smcap = NULL; 214 } 215 if (flags & PKCS7_REUSE_DIGEST) 216 { 217 if (!pkcs7_copy_existing_digest(p7, si)) 218 goto err; 219 if (!(flags & PKCS7_PARTIAL) && 220 !PKCS7_SIGNER_INFO_sign(si)) 221 goto err; 222 } 223 } 224 return si; 225 err: 226 if (smcap) 227 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free); 228 return NULL; 229 } 230 231/* Search for a digest matching SignerInfo digest type and if found 232 * copy across. 233 */ 234 235static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si) 236 { 237 int i; 238 STACK_OF(PKCS7_SIGNER_INFO) *sinfos; 239 PKCS7_SIGNER_INFO *sitmp; 240 ASN1_OCTET_STRING *osdig = NULL; 241 sinfos = PKCS7_get_signer_info(p7); 242 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) 243 { 244 sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i); 245 if (si == sitmp) 246 break; 247 if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0) 248 continue; 249 if (!OBJ_cmp(si->digest_alg->algorithm, 250 sitmp->digest_alg->algorithm)) 251 { 252 osdig = PKCS7_digest_from_attributes(sitmp->auth_attr); 253 break; 254 } 255 256 } 257 258 if (osdig) 259 return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length); 260 261 PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST, 262 PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND); 263 return 0; 264 } 265 266int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store, 267 BIO *indata, BIO *out, int flags) 268{ 269 STACK_OF(X509) *signers; 270 X509 *signer; 271 STACK_OF(PKCS7_SIGNER_INFO) *sinfos; 272 PKCS7_SIGNER_INFO *si; 273 X509_STORE_CTX cert_ctx; 274 char buf[4096]; 275 int i, j=0, k, ret = 0; 276 BIO *p7bio; 277 BIO *tmpin, *tmpout; 278 279 if(!p7) { 280 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER); 281 return 0; 282 } 283 284 if(!PKCS7_type_is_signed(p7)) { 285 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE); 286 return 0; 287 } 288 289 /* Check for no data and no content: no data to verify signature */ 290 if(PKCS7_get_detached(p7) && !indata) { 291 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT); 292 return 0; 293 } 294#if 0 295 /* NB: this test commented out because some versions of Netscape 296 * illegally include zero length content when signing data. 297 */ 298 299 /* Check for data and content: two sets of data */ 300 if(!PKCS7_get_detached(p7) && indata) { 301 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT); 302 return 0; 303 } 304#endif 305 306 sinfos = PKCS7_get_signer_info(p7); 307 308 if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) { 309 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA); 310 return 0; 311 } 312 313 314 signers = PKCS7_get0_signers(p7, certs, flags); 315 316 if(!signers) return 0; 317 318 /* Now verify the certificates */ 319 320 if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) { 321 signer = sk_X509_value (signers, k); 322 if (!(flags & PKCS7_NOCHAIN)) { 323 if(!X509_STORE_CTX_init(&cert_ctx, store, signer, 324 p7->d.sign->cert)) 325 { 326 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB); 327 sk_X509_free(signers); 328 return 0; 329 } 330 X509_STORE_CTX_set_default(&cert_ctx, "smime_sign"); 331 } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) { 332 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB); 333 sk_X509_free(signers); 334 return 0; 335 } 336 if (!(flags & PKCS7_NOCRL)) 337 X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl); 338 i = X509_verify_cert(&cert_ctx); 339 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx); 340 X509_STORE_CTX_cleanup(&cert_ctx); 341 if (i <= 0) { 342 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR); 343 ERR_add_error_data(2, "Verify error:", 344 X509_verify_cert_error_string(j)); 345 sk_X509_free(signers); 346 return 0; 347 } 348 /* Check for revocation status here */ 349 } 350 351 /* Performance optimization: if the content is a memory BIO then 352 * store its contents in a temporary read only memory BIO. This 353 * avoids potentially large numbers of slow copies of data which will 354 * occur when reading from a read write memory BIO when signatures 355 * are calculated. 356 */ 357 358 if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM)) 359 { 360 char *ptr; 361 long len; 362 len = BIO_get_mem_data(indata, &ptr); 363 tmpin = BIO_new_mem_buf(ptr, len); 364 if (tmpin == NULL) 365 { 366 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE); 367 return 0; 368 } 369 } 370 else 371 tmpin = indata; 372 373 374 if (!(p7bio=PKCS7_dataInit(p7,tmpin))) 375 goto err; 376 377 if(flags & PKCS7_TEXT) { 378 if(!(tmpout = BIO_new(BIO_s_mem()))) { 379 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE); 380 goto err; 381 } 382 BIO_set_mem_eof_return(tmpout, 0); 383 } else tmpout = out; 384 385 /* We now have to 'read' from p7bio to calculate digests etc. */ 386 for (;;) 387 { 388 i=BIO_read(p7bio,buf,sizeof(buf)); 389 if (i <= 0) break; 390 if (tmpout) BIO_write(tmpout, buf, i); 391 } 392 393 if(flags & PKCS7_TEXT) { 394 if(!SMIME_text(tmpout, out)) { 395 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR); 396 BIO_free(tmpout); 397 goto err; 398 } 399 BIO_free(tmpout); 400 } 401 402 /* Now Verify All Signatures */ 403 if (!(flags & PKCS7_NOSIGS)) 404 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++) 405 { 406 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i); 407 signer = sk_X509_value (signers, i); 408 j=PKCS7_signatureVerify(p7bio,p7,si, signer); 409 if (j <= 0) { 410 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE); 411 goto err; 412 } 413 } 414 415 ret = 1; 416 417 err: 418 419 if (tmpin == indata) 420 { 421 if (indata) BIO_pop(p7bio); 422 } 423 BIO_free_all(p7bio); 424 425 sk_X509_free(signers); 426 427 return ret; 428} 429 430STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags) 431{ 432 STACK_OF(X509) *signers; 433 STACK_OF(PKCS7_SIGNER_INFO) *sinfos; 434 PKCS7_SIGNER_INFO *si; 435 PKCS7_ISSUER_AND_SERIAL *ias; 436 X509 *signer; 437 int i; 438 439 if(!p7) { 440 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER); 441 return NULL; 442 } 443 444 if(!PKCS7_type_is_signed(p7)) { 445 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE); 446 return NULL; 447 } 448 449 /* Collect all the signers together */ 450 451 sinfos = PKCS7_get_signer_info(p7); 452 453 if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) { 454 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS); 455 return 0; 456 } 457 458 if(!(signers = sk_X509_new_null())) { 459 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE); 460 return NULL; 461 } 462 463 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) 464 { 465 si = sk_PKCS7_SIGNER_INFO_value(sinfos, i); 466 ias = si->issuer_and_serial; 467 signer = NULL; 468 /* If any certificates passed they take priority */ 469 if (certs) signer = X509_find_by_issuer_and_serial (certs, 470 ias->issuer, ias->serial); 471 if (!signer && !(flags & PKCS7_NOINTERN) 472 && p7->d.sign->cert) signer = 473 X509_find_by_issuer_and_serial (p7->d.sign->cert, 474 ias->issuer, ias->serial); 475 if (!signer) { 476 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND); 477 sk_X509_free(signers); 478 return 0; 479 } 480 481 if (!sk_X509_push(signers, signer)) { 482 sk_X509_free(signers); 483 return NULL; 484 } 485 } 486 return signers; 487} 488 489 490/* Build a complete PKCS#7 enveloped data */ 491 492PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher, 493 int flags) 494{ 495 PKCS7 *p7; 496 BIO *p7bio = NULL; 497 int i; 498 X509 *x509; 499 if(!(p7 = PKCS7_new())) { 500 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE); 501 return NULL; 502 } 503 504 if (!PKCS7_set_type(p7, NID_pkcs7_enveloped)) 505 goto err; 506 if (!PKCS7_set_cipher(p7, cipher)) { 507 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER); 508 goto err; 509 } 510 511 for(i = 0; i < sk_X509_num(certs); i++) { 512 x509 = sk_X509_value(certs, i); 513 if(!PKCS7_add_recipient(p7, x509)) { 514 PKCS7err(PKCS7_F_PKCS7_ENCRYPT, 515 PKCS7_R_ERROR_ADDING_RECIPIENT); 516 goto err; 517 } 518 } 519 520 if (flags & PKCS7_STREAM) 521 return p7; 522 523 if (PKCS7_final(p7, in, flags)) 524 return p7; 525 526 err: 527 528 BIO_free_all(p7bio); 529 PKCS7_free(p7); 530 return NULL; 531 532} 533 534int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags) 535{ 536 BIO *tmpmem; 537 int ret, i; 538 char buf[4096]; 539 540 if(!p7) { 541 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER); 542 return 0; 543 } 544 545 if(!PKCS7_type_is_enveloped(p7)) { 546 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE); 547 return 0; 548 } 549 550 if(cert && !X509_check_private_key(cert, pkey)) { 551 PKCS7err(PKCS7_F_PKCS7_DECRYPT, 552 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 553 return 0; 554 } 555 556 if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) { 557 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR); 558 return 0; 559 } 560 561 if (flags & PKCS7_TEXT) { 562 BIO *tmpbuf, *bread; 563 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */ 564 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) { 565 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE); 566 BIO_free_all(tmpmem); 567 return 0; 568 } 569 if(!(bread = BIO_push(tmpbuf, tmpmem))) { 570 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE); 571 BIO_free_all(tmpbuf); 572 BIO_free_all(tmpmem); 573 return 0; 574 } 575 ret = SMIME_text(bread, data); 576 if (ret > 0 && BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) 577 { 578 if (!BIO_get_cipher_status(tmpmem)) 579 ret = 0; 580 } 581 BIO_free_all(bread); 582 return ret; 583 } else { 584 for(;;) { 585 i = BIO_read(tmpmem, buf, sizeof(buf)); 586 if(i <= 0) 587 { 588 ret = 1; 589 if (BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) 590 { 591 if (!BIO_get_cipher_status(tmpmem)) 592 ret = 0; 593 } 594 595 break; 596 } 597 if (BIO_write(data, buf, i) != i) 598 { 599 ret = 0; 600 break; 601 } 602 } 603 BIO_free_all(tmpmem); 604 return ret; 605 } 606} 607