1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] 56 */ 57 /* ==================================================================== 58 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 59 * 60 * Redistribution and use in source and binary forms, with or without 61 * modification, are permitted provided that the following conditions 62 * are met: 63 * 64 * 1. Redistributions of source code must retain the above copyright 65 * notice, this list of conditions and the following disclaimer. 66 * 67 * 2. Redistributions in binary form must reproduce the above copyright 68 * notice, this list of conditions and the following disclaimer in 69 * the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3. All advertising materials mentioning features or use of this 73 * software must display the following acknowledgment: 74 * "This product includes software developed by the OpenSSL Project 75 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 76 * 77 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 78 * endorse or promote products derived from this software without 79 * prior written permission. For written permission, please contact 80 * openssl-core (at) openssl.org. 81 * 82 * 5. Products derived from this software may not be called "OpenSSL" 83 * nor may "OpenSSL" appear in their names without prior written 84 * permission of the OpenSSL Project. 85 * 86 * 6. Redistributions of any form whatsoever must retain the following 87 * acknowledgment: 88 * "This product includes software developed by the OpenSSL Project 89 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 90 * 91 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 92 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 93 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 94 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 95 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 96 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 97 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 98 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 99 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 100 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 101 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 102 * OF THE POSSIBILITY OF SUCH DAMAGE. 103 * ==================================================================== 104 * 105 * This product includes cryptographic software written by Eric Young 106 * (eay (at) cryptsoft.com). This product includes software written by Tim 107 * Hudson (tjh (at) cryptsoft.com). 108 * 109 */ 110 /* ==================================================================== 111 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 112 * ECC cipher suite support in OpenSSL originally developed by 113 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. */ 114 115 #include <openssl/ssl.h> 116 117 #include <assert.h> 118 #include <limits.h> 119 #include <string.h> 120 121 #include <openssl/bn.h> 122 #include <openssl/buf.h> 123 #include <openssl/bytestring.h> 124 #include <openssl/dh.h> 125 #include <openssl/ec_key.h> 126 #include <openssl/err.h> 127 #include <openssl/mem.h> 128 #include <openssl/sha.h> 129 #include <openssl/x509.h> 130 131 #include "../crypto/internal.h" 132 #include "internal.h" 133 134 135 CERT *ssl_cert_new(const SSL_X509_METHOD *x509_method) { 136 CERT *ret = OPENSSL_malloc(sizeof(CERT)); 137 if (ret == NULL) { 138 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 139 return NULL; 140 } 141 OPENSSL_memset(ret, 0, sizeof(CERT)); 142 ret->x509_method = x509_method; 143 144 return ret; 145 } 146 147 static CRYPTO_BUFFER *buffer_up_ref(CRYPTO_BUFFER *buffer) { 148 CRYPTO_BUFFER_up_ref(buffer); 149 return buffer; 150 } 151 152 CERT *ssl_cert_dup(CERT *cert) { 153 CERT *ret = OPENSSL_malloc(sizeof(CERT)); 154 if (ret == NULL) { 155 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 156 return NULL; 157 } 158 OPENSSL_memset(ret, 0, sizeof(CERT)); 159 160 ret->chain = sk_CRYPTO_BUFFER_deep_copy(cert->chain, buffer_up_ref, 161 CRYPTO_BUFFER_free); 162 163 if (cert->privatekey != NULL) { 164 EVP_PKEY_up_ref(cert->privatekey); 165 ret->privatekey = cert->privatekey; 166 } 167 168 ret->key_method = cert->key_method; 169 ret->x509_method = cert->x509_method; 170 171 if (cert->dh_tmp != NULL) { 172 ret->dh_tmp = DHparams_dup(cert->dh_tmp); 173 if (ret->dh_tmp == NULL) { 174 OPENSSL_PUT_ERROR(SSL, ERR_R_DH_LIB); 175 goto err; 176 } 177 } 178 ret->dh_tmp_cb = cert->dh_tmp_cb; 179 180 if (cert->sigalgs != NULL) { 181 ret->sigalgs = 182 BUF_memdup(cert->sigalgs, cert->num_sigalgs * sizeof(cert->sigalgs[0])); 183 if (ret->sigalgs == NULL) { 184 goto err; 185 } 186 } 187 ret->num_sigalgs = cert->num_sigalgs; 188 189 ret->cert_cb = cert->cert_cb; 190 ret->cert_cb_arg = cert->cert_cb_arg; 191 192 ret->x509_method->cert_dup(ret, cert); 193 194 if (cert->signed_cert_timestamp_list != NULL) { 195 CRYPTO_BUFFER_up_ref(cert->signed_cert_timestamp_list); 196 ret->signed_cert_timestamp_list = cert->signed_cert_timestamp_list; 197 } 198 199 if (cert->ocsp_response != NULL) { 200 CRYPTO_BUFFER_up_ref(cert->ocsp_response); 201 ret->ocsp_response = cert->ocsp_response; 202 } 203 204 ret->sid_ctx_length = cert->sid_ctx_length; 205 OPENSSL_memcpy(ret->sid_ctx, cert->sid_ctx, sizeof(ret->sid_ctx)); 206 207 return ret; 208 209 err: 210 ssl_cert_free(ret); 211 return NULL; 212 } 213 214 /* Free up and clear all certificates and chains */ 215 void ssl_cert_clear_certs(CERT *cert) { 216 if (cert == NULL) { 217 return; 218 } 219 220 cert->x509_method->cert_clear(cert); 221 222 sk_CRYPTO_BUFFER_pop_free(cert->chain, CRYPTO_BUFFER_free); 223 cert->chain = NULL; 224 EVP_PKEY_free(cert->privatekey); 225 cert->privatekey = NULL; 226 cert->key_method = NULL; 227 } 228 229 void ssl_cert_free(CERT *c) { 230 if (c == NULL) { 231 return; 232 } 233 234 DH_free(c->dh_tmp); 235 236 ssl_cert_clear_certs(c); 237 c->x509_method->cert_free(c); 238 OPENSSL_free(c->sigalgs); 239 CRYPTO_BUFFER_free(c->signed_cert_timestamp_list); 240 CRYPTO_BUFFER_free(c->ocsp_response); 241 242 OPENSSL_free(c); 243 } 244 245 static void ssl_cert_set_cert_cb(CERT *c, int (*cb)(SSL *ssl, void *arg), 246 void *arg) { 247 c->cert_cb = cb; 248 c->cert_cb_arg = arg; 249 } 250 251 enum leaf_cert_and_privkey_result_t { 252 leaf_cert_and_privkey_error, 253 leaf_cert_and_privkey_ok, 254 leaf_cert_and_privkey_mismatch, 255 }; 256 257 /* check_leaf_cert_and_privkey checks whether the certificate in |leaf_buffer| 258 * and the private key in |privkey| are suitable and coherent. It returns 259 * |leaf_cert_and_privkey_error| and pushes to the error queue if a problem is 260 * found. If the certificate and private key are valid, but incoherent, it 261 * returns |leaf_cert_and_privkey_mismatch|. Otherwise it returns 262 * |leaf_cert_and_privkey_ok|. */ 263 static enum leaf_cert_and_privkey_result_t check_leaf_cert_and_privkey( 264 CRYPTO_BUFFER *leaf_buffer, EVP_PKEY *privkey) { 265 enum leaf_cert_and_privkey_result_t ret = leaf_cert_and_privkey_error; 266 267 CBS cert_cbs; 268 CRYPTO_BUFFER_init_CBS(leaf_buffer, &cert_cbs); 269 EVP_PKEY *pubkey = ssl_cert_parse_pubkey(&cert_cbs); 270 if (pubkey == NULL) { 271 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); 272 goto out; 273 } 274 275 if (!ssl_is_key_type_supported(pubkey->type)) { 276 OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 277 goto out; 278 } 279 280 /* An ECC certificate may be usable for ECDH or ECDSA. We only support ECDSA 281 * certificates, so sanity-check the key usage extension. */ 282 if (pubkey->type == EVP_PKEY_EC && 283 !ssl_cert_check_digital_signature_key_usage(&cert_cbs)) { 284 OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 285 goto out; 286 } 287 288 if (privkey != NULL && 289 /* Sanity-check that the private key and the certificate match. */ 290 !ssl_compare_public_and_private_key(pubkey, privkey)) { 291 ERR_clear_error(); 292 ret = leaf_cert_and_privkey_mismatch; 293 goto out; 294 } 295 296 ret = leaf_cert_and_privkey_ok; 297 298 out: 299 EVP_PKEY_free(pubkey); 300 return ret; 301 } 302 303 static int cert_set_chain_and_key( 304 CERT *cert, CRYPTO_BUFFER *const *certs, size_t num_certs, 305 EVP_PKEY *privkey, const SSL_PRIVATE_KEY_METHOD *privkey_method) { 306 if (num_certs == 0 || 307 (privkey == NULL && privkey_method == NULL)) { 308 OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER); 309 return 0; 310 } 311 312 if (privkey != NULL && privkey_method != NULL) { 313 OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_HAVE_BOTH_PRIVKEY_AND_METHOD); 314 return 0; 315 } 316 317 switch (check_leaf_cert_and_privkey(certs[0], privkey)) { 318 case leaf_cert_and_privkey_error: 319 return 0; 320 case leaf_cert_and_privkey_mismatch: 321 OPENSSL_PUT_ERROR(SSL, SSL_R_CERTIFICATE_AND_PRIVATE_KEY_MISMATCH); 322 return 0; 323 case leaf_cert_and_privkey_ok: 324 break; 325 } 326 327 STACK_OF(CRYPTO_BUFFER) *certs_sk = sk_CRYPTO_BUFFER_new_null(); 328 if (certs_sk == NULL) { 329 return 0; 330 } 331 332 for (size_t i = 0; i < num_certs; i++) { 333 if (!sk_CRYPTO_BUFFER_push(certs_sk, certs[i])) { 334 sk_CRYPTO_BUFFER_pop_free(certs_sk, CRYPTO_BUFFER_free); 335 return 0; 336 } 337 CRYPTO_BUFFER_up_ref(certs[i]); 338 } 339 340 EVP_PKEY_free(cert->privatekey); 341 cert->privatekey = privkey; 342 if (privkey != NULL) { 343 EVP_PKEY_up_ref(privkey); 344 } 345 cert->key_method = privkey_method; 346 347 sk_CRYPTO_BUFFER_pop_free(cert->chain, CRYPTO_BUFFER_free); 348 cert->chain = certs_sk; 349 350 return 1; 351 } 352 353 int SSL_set_chain_and_key(SSL *ssl, CRYPTO_BUFFER *const *certs, 354 size_t num_certs, EVP_PKEY *privkey, 355 const SSL_PRIVATE_KEY_METHOD *privkey_method) { 356 return cert_set_chain_and_key(ssl->cert, certs, num_certs, privkey, 357 privkey_method); 358 } 359 360 int SSL_CTX_set_chain_and_key(SSL_CTX *ctx, CRYPTO_BUFFER *const *certs, 361 size_t num_certs, EVP_PKEY *privkey, 362 const SSL_PRIVATE_KEY_METHOD *privkey_method) { 363 return cert_set_chain_and_key(ctx->cert, certs, num_certs, privkey, 364 privkey_method); 365 } 366 367 int ssl_set_cert(CERT *cert, CRYPTO_BUFFER *buffer) { 368 switch (check_leaf_cert_and_privkey(buffer, cert->privatekey)) { 369 case leaf_cert_and_privkey_error: 370 return 0; 371 case leaf_cert_and_privkey_mismatch: 372 /* don't fail for a cert/key mismatch, just free current private key 373 * (when switching to a different cert & key, first this function should 374 * be used, then |ssl_set_pkey|. */ 375 EVP_PKEY_free(cert->privatekey); 376 cert->privatekey = NULL; 377 break; 378 case leaf_cert_and_privkey_ok: 379 break; 380 } 381 382 cert->x509_method->cert_flush_cached_leaf(cert); 383 384 if (cert->chain != NULL) { 385 CRYPTO_BUFFER_free(sk_CRYPTO_BUFFER_value(cert->chain, 0)); 386 sk_CRYPTO_BUFFER_set(cert->chain, 0, buffer); 387 CRYPTO_BUFFER_up_ref(buffer); 388 return 1; 389 } 390 391 cert->chain = sk_CRYPTO_BUFFER_new_null(); 392 if (cert->chain == NULL) { 393 return 0; 394 } 395 396 if (!sk_CRYPTO_BUFFER_push(cert->chain, buffer)) { 397 sk_CRYPTO_BUFFER_free(cert->chain); 398 cert->chain = NULL; 399 return 0; 400 } 401 CRYPTO_BUFFER_up_ref(buffer); 402 403 return 1; 404 } 405 406 int SSL_CTX_use_certificate_ASN1(SSL_CTX *ctx, size_t der_len, 407 const uint8_t *der) { 408 CRYPTO_BUFFER *buffer = CRYPTO_BUFFER_new(der, der_len, NULL); 409 if (buffer == NULL) { 410 return 0; 411 } 412 413 const int ok = ssl_set_cert(ctx->cert, buffer); 414 CRYPTO_BUFFER_free(buffer); 415 return ok; 416 } 417 418 int SSL_use_certificate_ASN1(SSL *ssl, const uint8_t *der, size_t der_len) { 419 CRYPTO_BUFFER *buffer = CRYPTO_BUFFER_new(der, der_len, NULL); 420 if (buffer == NULL) { 421 return 0; 422 } 423 424 const int ok = ssl_set_cert(ssl->cert, buffer); 425 CRYPTO_BUFFER_free(buffer); 426 return ok; 427 } 428 429 int ssl_has_certificate(const SSL *ssl) { 430 return ssl->cert->chain != NULL && 431 sk_CRYPTO_BUFFER_value(ssl->cert->chain, 0) != NULL && 432 ssl_has_private_key(ssl); 433 } 434 435 STACK_OF(CRYPTO_BUFFER) *ssl_parse_cert_chain(uint8_t *out_alert, 436 EVP_PKEY **out_pubkey, 437 uint8_t *out_leaf_sha256, 438 CBS *cbs, 439 CRYPTO_BUFFER_POOL *pool) { 440 *out_pubkey = NULL; 441 442 STACK_OF(CRYPTO_BUFFER) *ret = sk_CRYPTO_BUFFER_new_null(); 443 if (ret == NULL) { 444 *out_alert = SSL_AD_INTERNAL_ERROR; 445 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 446 return NULL; 447 } 448 449 CBS certificate_list; 450 if (!CBS_get_u24_length_prefixed(cbs, &certificate_list)) { 451 *out_alert = SSL_AD_DECODE_ERROR; 452 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); 453 goto err; 454 } 455 456 while (CBS_len(&certificate_list) > 0) { 457 CBS certificate; 458 if (!CBS_get_u24_length_prefixed(&certificate_list, &certificate) || 459 CBS_len(&certificate) == 0) { 460 *out_alert = SSL_AD_DECODE_ERROR; 461 OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_LENGTH_MISMATCH); 462 goto err; 463 } 464 465 if (sk_CRYPTO_BUFFER_num(ret) == 0) { 466 *out_pubkey = ssl_cert_parse_pubkey(&certificate); 467 if (*out_pubkey == NULL) { 468 *out_alert = SSL_AD_DECODE_ERROR; 469 goto err; 470 } 471 472 /* Retain the hash of the leaf certificate if requested. */ 473 if (out_leaf_sha256 != NULL) { 474 SHA256(CBS_data(&certificate), CBS_len(&certificate), out_leaf_sha256); 475 } 476 } 477 478 CRYPTO_BUFFER *buf = 479 CRYPTO_BUFFER_new_from_CBS(&certificate, pool); 480 if (buf == NULL) { 481 *out_alert = SSL_AD_DECODE_ERROR; 482 goto err; 483 } 484 485 if (!sk_CRYPTO_BUFFER_push(ret, buf)) { 486 *out_alert = SSL_AD_INTERNAL_ERROR; 487 CRYPTO_BUFFER_free(buf); 488 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 489 goto err; 490 } 491 } 492 493 return ret; 494 495 err: 496 EVP_PKEY_free(*out_pubkey); 497 *out_pubkey = NULL; 498 sk_CRYPTO_BUFFER_pop_free(ret, CRYPTO_BUFFER_free); 499 return NULL; 500 } 501 502 int ssl_add_cert_chain(SSL *ssl, CBB *cbb) { 503 if (!ssl_has_certificate(ssl)) { 504 return CBB_add_u24(cbb, 0); 505 } 506 507 CBB certs; 508 if (!CBB_add_u24_length_prefixed(cbb, &certs)) { 509 goto err; 510 } 511 512 STACK_OF(CRYPTO_BUFFER) *chain = ssl->cert->chain; 513 for (size_t i = 0; i < sk_CRYPTO_BUFFER_num(chain); i++) { 514 CRYPTO_BUFFER *buffer = sk_CRYPTO_BUFFER_value(chain, i); 515 CBB child; 516 if (!CBB_add_u24_length_prefixed(&certs, &child) || 517 !CBB_add_bytes(&child, CRYPTO_BUFFER_data(buffer), 518 CRYPTO_BUFFER_len(buffer)) || 519 !CBB_flush(&certs)) { 520 goto err; 521 } 522 } 523 524 return CBB_flush(cbb); 525 526 err: 527 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); 528 return 0; 529 } 530 531 /* ssl_cert_skip_to_spki parses a DER-encoded, X.509 certificate from |in| and 532 * positions |*out_tbs_cert| to cover the TBSCertificate, starting at the 533 * subjectPublicKeyInfo. */ 534 static int ssl_cert_skip_to_spki(const CBS *in, CBS *out_tbs_cert) { 535 /* From RFC 5280, section 4.1 536 * Certificate ::= SEQUENCE { 537 * tbsCertificate TBSCertificate, 538 * signatureAlgorithm AlgorithmIdentifier, 539 * signatureValue BIT STRING } 540 541 * TBSCertificate ::= SEQUENCE { 542 * version [0] EXPLICIT Version DEFAULT v1, 543 * serialNumber CertificateSerialNumber, 544 * signature AlgorithmIdentifier, 545 * issuer Name, 546 * validity Validity, 547 * subject Name, 548 * subjectPublicKeyInfo SubjectPublicKeyInfo, 549 * ... } */ 550 CBS buf = *in; 551 552 CBS toplevel; 553 if (!CBS_get_asn1(&buf, &toplevel, CBS_ASN1_SEQUENCE) || 554 CBS_len(&buf) != 0 || 555 !CBS_get_asn1(&toplevel, out_tbs_cert, CBS_ASN1_SEQUENCE) || 556 /* version */ 557 !CBS_get_optional_asn1( 558 out_tbs_cert, NULL, NULL, 559 CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) || 560 /* serialNumber */ 561 !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_INTEGER) || 562 /* signature algorithm */ 563 !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE) || 564 /* issuer */ 565 !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE) || 566 /* validity */ 567 !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE) || 568 /* subject */ 569 !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE)) { 570 return 0; 571 } 572 573 return 1; 574 } 575 576 EVP_PKEY *ssl_cert_parse_pubkey(const CBS *in) { 577 CBS buf = *in, tbs_cert; 578 if (!ssl_cert_skip_to_spki(&buf, &tbs_cert)) { 579 OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT); 580 return NULL; 581 } 582 583 return EVP_parse_public_key(&tbs_cert); 584 } 585 586 int ssl_compare_public_and_private_key(const EVP_PKEY *pubkey, 587 const EVP_PKEY *privkey) { 588 if (EVP_PKEY_is_opaque(privkey)) { 589 /* We cannot check an opaque private key and have to trust that it 590 * matches. */ 591 return 1; 592 } 593 594 int ret = 0; 595 596 switch (EVP_PKEY_cmp(pubkey, privkey)) { 597 case 1: 598 ret = 1; 599 break; 600 case 0: 601 OPENSSL_PUT_ERROR(X509, X509_R_KEY_VALUES_MISMATCH); 602 break; 603 case -1: 604 OPENSSL_PUT_ERROR(X509, X509_R_KEY_TYPE_MISMATCH); 605 break; 606 case -2: 607 OPENSSL_PUT_ERROR(X509, X509_R_UNKNOWN_KEY_TYPE); 608 default: 609 assert(0); 610 break; 611 } 612 613 return ret; 614 } 615 616 int ssl_cert_check_private_key(const CERT *cert, const EVP_PKEY *privkey) { 617 if (privkey == NULL) { 618 OPENSSL_PUT_ERROR(SSL, SSL_R_NO_PRIVATE_KEY_ASSIGNED); 619 return 0; 620 } 621 622 if (cert->chain == NULL || 623 sk_CRYPTO_BUFFER_value(cert->chain, 0) == NULL) { 624 OPENSSL_PUT_ERROR(SSL, SSL_R_NO_CERTIFICATE_ASSIGNED); 625 return 0; 626 } 627 628 CBS cert_cbs; 629 CRYPTO_BUFFER_init_CBS(sk_CRYPTO_BUFFER_value(cert->chain, 0), &cert_cbs); 630 EVP_PKEY *pubkey = ssl_cert_parse_pubkey(&cert_cbs); 631 if (!pubkey) { 632 OPENSSL_PUT_ERROR(X509, X509_R_UNKNOWN_KEY_TYPE); 633 return 0; 634 } 635 636 const int ok = ssl_compare_public_and_private_key(pubkey, privkey); 637 EVP_PKEY_free(pubkey); 638 return ok; 639 } 640 641 int ssl_cert_check_digital_signature_key_usage(const CBS *in) { 642 CBS buf = *in; 643 644 CBS tbs_cert, outer_extensions; 645 int has_extensions; 646 if (!ssl_cert_skip_to_spki(&buf, &tbs_cert) || 647 /* subjectPublicKeyInfo */ 648 !CBS_get_asn1(&tbs_cert, NULL, CBS_ASN1_SEQUENCE) || 649 /* issuerUniqueID */ 650 !CBS_get_optional_asn1( 651 &tbs_cert, NULL, NULL, 652 CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 1) || 653 /* subjectUniqueID */ 654 !CBS_get_optional_asn1( 655 &tbs_cert, NULL, NULL, 656 CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 2) || 657 !CBS_get_optional_asn1( 658 &tbs_cert, &outer_extensions, &has_extensions, 659 CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 3)) { 660 goto parse_err; 661 } 662 663 if (!has_extensions) { 664 return 1; 665 } 666 667 CBS extensions; 668 if (!CBS_get_asn1(&outer_extensions, &extensions, CBS_ASN1_SEQUENCE)) { 669 goto parse_err; 670 } 671 672 while (CBS_len(&extensions) > 0) { 673 CBS extension, oid, contents; 674 if (!CBS_get_asn1(&extensions, &extension, CBS_ASN1_SEQUENCE) || 675 !CBS_get_asn1(&extension, &oid, CBS_ASN1_OBJECT) || 676 (CBS_peek_asn1_tag(&extension, CBS_ASN1_BOOLEAN) && 677 !CBS_get_asn1(&extension, NULL, CBS_ASN1_BOOLEAN)) || 678 !CBS_get_asn1(&extension, &contents, CBS_ASN1_OCTETSTRING) || 679 CBS_len(&extension) != 0) { 680 goto parse_err; 681 } 682 683 static const uint8_t kKeyUsageOID[3] = {0x55, 0x1d, 0x0f}; 684 if (CBS_len(&oid) != sizeof(kKeyUsageOID) || 685 OPENSSL_memcmp(CBS_data(&oid), kKeyUsageOID, sizeof(kKeyUsageOID)) != 686 0) { 687 continue; 688 } 689 690 CBS bit_string; 691 if (!CBS_get_asn1(&contents, &bit_string, CBS_ASN1_BITSTRING) || 692 CBS_len(&contents) != 0) { 693 goto parse_err; 694 } 695 696 /* This is the KeyUsage extension. See 697 * https://tools.ietf.org/html/rfc5280#section-4.2.1.3 */ 698 if (!CBS_is_valid_asn1_bitstring(&bit_string)) { 699 goto parse_err; 700 } 701 702 if (!CBS_asn1_bitstring_has_bit(&bit_string, 0)) { 703 OPENSSL_PUT_ERROR(SSL, SSL_R_ECC_CERT_NOT_FOR_SIGNING); 704 return 0; 705 } 706 707 return 1; 708 } 709 710 /* No KeyUsage extension found. */ 711 return 1; 712 713 parse_err: 714 OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT); 715 return 0; 716 } 717 718 STACK_OF(CRYPTO_BUFFER) * 719 ssl_parse_client_CA_list(SSL *ssl, uint8_t *out_alert, CBS *cbs) { 720 CRYPTO_BUFFER_POOL *const pool = ssl->ctx->pool; 721 722 STACK_OF(CRYPTO_BUFFER) *ret = sk_CRYPTO_BUFFER_new_null(); 723 if (ret == NULL) { 724 *out_alert = SSL_AD_INTERNAL_ERROR; 725 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 726 return NULL; 727 } 728 729 CBS child; 730 if (!CBS_get_u16_length_prefixed(cbs, &child)) { 731 *out_alert = SSL_AD_DECODE_ERROR; 732 OPENSSL_PUT_ERROR(SSL, SSL_R_LENGTH_MISMATCH); 733 goto err; 734 } 735 736 while (CBS_len(&child) > 0) { 737 CBS distinguished_name; 738 if (!CBS_get_u16_length_prefixed(&child, &distinguished_name)) { 739 *out_alert = SSL_AD_DECODE_ERROR; 740 OPENSSL_PUT_ERROR(SSL, SSL_R_CA_DN_TOO_LONG); 741 goto err; 742 } 743 744 CRYPTO_BUFFER *buffer = 745 CRYPTO_BUFFER_new_from_CBS(&distinguished_name, pool); 746 if (buffer == NULL || 747 !sk_CRYPTO_BUFFER_push(ret, buffer)) { 748 CRYPTO_BUFFER_free(buffer); 749 *out_alert = SSL_AD_INTERNAL_ERROR; 750 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 751 goto err; 752 } 753 } 754 755 if (!ssl->ctx->x509_method->check_client_CA_list(ret)) { 756 *out_alert = SSL_AD_INTERNAL_ERROR; 757 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); 758 goto err; 759 } 760 761 return ret; 762 763 err: 764 sk_CRYPTO_BUFFER_pop_free(ret, CRYPTO_BUFFER_free); 765 return NULL; 766 } 767 768 int ssl_add_client_CA_list(SSL *ssl, CBB *cbb) { 769 CBB child, name_cbb; 770 if (!CBB_add_u16_length_prefixed(cbb, &child)) { 771 return 0; 772 } 773 774 STACK_OF(CRYPTO_BUFFER) *names = ssl->client_CA; 775 if (names == NULL) { 776 names = ssl->ctx->client_CA; 777 } 778 if (names == NULL) { 779 return CBB_flush(cbb); 780 } 781 782 for (size_t i = 0; i < sk_CRYPTO_BUFFER_num(names); i++) { 783 const CRYPTO_BUFFER *name = sk_CRYPTO_BUFFER_value(names, i); 784 785 if (!CBB_add_u16_length_prefixed(&child, &name_cbb) || 786 !CBB_add_bytes(&name_cbb, CRYPTO_BUFFER_data(name), 787 CRYPTO_BUFFER_len(name))) { 788 return 0; 789 } 790 } 791 792 return CBB_flush(cbb); 793 } 794 795 void SSL_CTX_set_cert_cb(SSL_CTX *ctx, int (*cb)(SSL *ssl, void *arg), 796 void *arg) { 797 ssl_cert_set_cert_cb(ctx->cert, cb, arg); 798 } 799 800 void SSL_set_cert_cb(SSL *ssl, int (*cb)(SSL *ssl, void *arg), void *arg) { 801 ssl_cert_set_cert_cb(ssl->cert, cb, arg); 802 } 803 804 STACK_OF(CRYPTO_BUFFER) *SSL_get0_peer_certificates(const SSL *ssl) { 805 SSL_SESSION *session = SSL_get_session(ssl); 806 if (session == NULL) { 807 return NULL; 808 } 809 810 return session->certs; 811 } 812 813 STACK_OF(CRYPTO_BUFFER) *SSL_get0_server_requested_CAs(const SSL *ssl) { 814 if (ssl->s3->hs == NULL) { 815 return NULL; 816 } 817 return ssl->s3->hs->ca_names; 818 } 819 820 int ssl_check_leaf_certificate(SSL_HANDSHAKE *hs, EVP_PKEY *pkey, 821 const CRYPTO_BUFFER *leaf) { 822 SSL *const ssl = hs->ssl; 823 assert(ssl3_protocol_version(ssl) < TLS1_3_VERSION); 824 825 /* Check the certificate's type matches the cipher. */ 826 int expected_type = ssl_cipher_get_key_type(hs->new_cipher); 827 assert(expected_type != EVP_PKEY_NONE); 828 if (pkey->type != expected_type) { 829 OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CERTIFICATE_TYPE); 830 return 0; 831 } 832 833 if (hs->new_cipher->algorithm_auth & SSL_aECDSA) { 834 CBS leaf_cbs; 835 CBS_init(&leaf_cbs, CRYPTO_BUFFER_data(leaf), CRYPTO_BUFFER_len(leaf)); 836 /* ECDSA and ECDH certificates use the same public key format. Instead, 837 * they are distinguished by the key usage extension in the certificate. */ 838 if (!ssl_cert_check_digital_signature_key_usage(&leaf_cbs)) { 839 return 0; 840 } 841 842 EC_KEY *ec_key = EVP_PKEY_get0_EC_KEY(pkey); 843 if (ec_key == NULL) { 844 OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_ECC_CERT); 845 return 0; 846 } 847 848 /* Check the key's group and point format are acceptable. */ 849 uint16_t group_id; 850 if (!ssl_nid_to_group_id( 851 &group_id, EC_GROUP_get_curve_name(EC_KEY_get0_group(ec_key))) || 852 !tls1_check_group_id(ssl, group_id) || 853 EC_KEY_get_conv_form(ec_key) != POINT_CONVERSION_UNCOMPRESSED) { 854 OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_ECC_CERT); 855 return 0; 856 } 857 } 858 859 return 1; 860 } 861 862 static int set_signed_cert_timestamp_list(CERT *cert, const uint8_t *list, 863 size_t list_len) { 864 CBS sct_list; 865 CBS_init(&sct_list, list, list_len); 866 if (!ssl_is_sct_list_valid(&sct_list)) { 867 OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SCT_LIST); 868 return 0; 869 } 870 871 CRYPTO_BUFFER_free(cert->signed_cert_timestamp_list); 872 cert->signed_cert_timestamp_list = 873 CRYPTO_BUFFER_new(CBS_data(&sct_list), CBS_len(&sct_list), NULL); 874 return cert->signed_cert_timestamp_list != NULL; 875 } 876 877 int SSL_CTX_set_signed_cert_timestamp_list(SSL_CTX *ctx, const uint8_t *list, 878 size_t list_len) { 879 return set_signed_cert_timestamp_list(ctx->cert, list, list_len); 880 } 881 882 int SSL_set_signed_cert_timestamp_list(SSL *ssl, const uint8_t *list, 883 size_t list_len) { 884 return set_signed_cert_timestamp_list(ssl->cert, list, list_len); 885 } 886 887 int SSL_CTX_set_ocsp_response(SSL_CTX *ctx, const uint8_t *response, 888 size_t response_len) { 889 CRYPTO_BUFFER_free(ctx->cert->ocsp_response); 890 ctx->cert->ocsp_response = CRYPTO_BUFFER_new(response, response_len, NULL); 891 return ctx->cert->ocsp_response != NULL; 892 } 893 894 int SSL_set_ocsp_response(SSL *ssl, const uint8_t *response, 895 size_t response_len) { 896 CRYPTO_BUFFER_free(ssl->cert->ocsp_response); 897 ssl->cert->ocsp_response = CRYPTO_BUFFER_new(response, response_len, NULL); 898 return ssl->cert->ocsp_response != NULL; 899 } 900
