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 <utility> 122 123 #include <openssl/bn.h> 124 #include <openssl/buf.h> 125 #include <openssl/bytestring.h> 126 #include <openssl/ec_key.h> 127 #include <openssl/err.h> 128 #include <openssl/mem.h> 129 #include <openssl/sha.h> 130 #include <openssl/x509.h> 131 132 #include "../crypto/internal.h" 133 #include "internal.h" 134 135 136 namespace bssl { 137 138 CERT *ssl_cert_new(const SSL_X509_METHOD *x509_method) { 139 CERT *ret = (CERT *)OPENSSL_malloc(sizeof(CERT)); 140 if (ret == NULL) { 141 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 142 return NULL; 143 } 144 OPENSSL_memset(ret, 0, sizeof(CERT)); 145 ret->x509_method = x509_method; 146 147 return ret; 148 } 149 150 static CRYPTO_BUFFER *buffer_up_ref(CRYPTO_BUFFER *buffer) { 151 CRYPTO_BUFFER_up_ref(buffer); 152 return buffer; 153 } 154 155 CERT *ssl_cert_dup(CERT *cert) { 156 CERT *ret = (CERT *)OPENSSL_malloc(sizeof(CERT)); 157 if (ret == NULL) { 158 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 159 return NULL; 160 } 161 OPENSSL_memset(ret, 0, sizeof(CERT)); 162 163 ret->chain = sk_CRYPTO_BUFFER_deep_copy(cert->chain, buffer_up_ref, 164 CRYPTO_BUFFER_free); 165 166 if (cert->privatekey != NULL) { 167 EVP_PKEY_up_ref(cert->privatekey); 168 ret->privatekey = cert->privatekey; 169 } 170 171 ret->key_method = cert->key_method; 172 ret->x509_method = cert->x509_method; 173 174 if (cert->sigalgs != NULL) { 175 ret->sigalgs = (uint16_t *)BUF_memdup( 176 cert->sigalgs, cert->num_sigalgs * sizeof(cert->sigalgs[0])); 177 if (ret->sigalgs == NULL) { 178 goto err; 179 } 180 } 181 ret->num_sigalgs = cert->num_sigalgs; 182 183 ret->cert_cb = cert->cert_cb; 184 ret->cert_cb_arg = cert->cert_cb_arg; 185 186 ret->x509_method->cert_dup(ret, cert); 187 188 if (cert->signed_cert_timestamp_list != NULL) { 189 CRYPTO_BUFFER_up_ref(cert->signed_cert_timestamp_list); 190 ret->signed_cert_timestamp_list = cert->signed_cert_timestamp_list; 191 } 192 193 if (cert->ocsp_response != NULL) { 194 CRYPTO_BUFFER_up_ref(cert->ocsp_response); 195 ret->ocsp_response = cert->ocsp_response; 196 } 197 198 ret->sid_ctx_length = cert->sid_ctx_length; 199 OPENSSL_memcpy(ret->sid_ctx, cert->sid_ctx, sizeof(ret->sid_ctx)); 200 201 ret->enable_early_data = cert->enable_early_data; 202 203 return ret; 204 205 err: 206 ssl_cert_free(ret); 207 return NULL; 208 } 209 210 // Free up and clear all certificates and chains 211 void ssl_cert_clear_certs(CERT *cert) { 212 if (cert == NULL) { 213 return; 214 } 215 216 cert->x509_method->cert_clear(cert); 217 218 sk_CRYPTO_BUFFER_pop_free(cert->chain, CRYPTO_BUFFER_free); 219 cert->chain = NULL; 220 EVP_PKEY_free(cert->privatekey); 221 cert->privatekey = NULL; 222 cert->key_method = NULL; 223 } 224 225 void ssl_cert_free(CERT *cert) { 226 if (cert == NULL) { 227 return; 228 } 229 230 ssl_cert_clear_certs(cert); 231 cert->x509_method->cert_free(cert); 232 OPENSSL_free(cert->sigalgs); 233 CRYPTO_BUFFER_free(cert->signed_cert_timestamp_list); 234 CRYPTO_BUFFER_free(cert->ocsp_response); 235 236 OPENSSL_free(cert); 237 } 238 239 static void ssl_cert_set_cert_cb(CERT *cert, int (*cb)(SSL *ssl, void *arg), 240 void *arg) { 241 cert->cert_cb = cb; 242 cert->cert_cb_arg = arg; 243 } 244 245 enum leaf_cert_and_privkey_result_t { 246 leaf_cert_and_privkey_error, 247 leaf_cert_and_privkey_ok, 248 leaf_cert_and_privkey_mismatch, 249 }; 250 251 // check_leaf_cert_and_privkey checks whether the certificate in |leaf_buffer| 252 // and the private key in |privkey| are suitable and coherent. It returns 253 // |leaf_cert_and_privkey_error| and pushes to the error queue if a problem is 254 // found. If the certificate and private key are valid, but incoherent, it 255 // returns |leaf_cert_and_privkey_mismatch|. Otherwise it returns 256 // |leaf_cert_and_privkey_ok|. 257 static enum leaf_cert_and_privkey_result_t check_leaf_cert_and_privkey( 258 CRYPTO_BUFFER *leaf_buffer, EVP_PKEY *privkey) { 259 CBS cert_cbs; 260 CRYPTO_BUFFER_init_CBS(leaf_buffer, &cert_cbs); 261 UniquePtr<EVP_PKEY> pubkey = ssl_cert_parse_pubkey(&cert_cbs); 262 if (!pubkey) { 263 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); 264 return leaf_cert_and_privkey_error; 265 } 266 267 if (!ssl_is_key_type_supported(pubkey->type)) { 268 OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 269 return leaf_cert_and_privkey_error; 270 } 271 272 // An ECC certificate may be usable for ECDH or ECDSA. We only support ECDSA 273 // certificates, so sanity-check the key usage extension. 274 if (pubkey->type == EVP_PKEY_EC && 275 !ssl_cert_check_digital_signature_key_usage(&cert_cbs)) { 276 OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 277 return leaf_cert_and_privkey_error; 278 } 279 280 if (privkey != NULL && 281 // Sanity-check that the private key and the certificate match. 282 !ssl_compare_public_and_private_key(pubkey.get(), privkey)) { 283 ERR_clear_error(); 284 return leaf_cert_and_privkey_mismatch; 285 } 286 287 return leaf_cert_and_privkey_ok; 288 } 289 290 static int cert_set_chain_and_key( 291 CERT *cert, CRYPTO_BUFFER *const *certs, size_t num_certs, 292 EVP_PKEY *privkey, const SSL_PRIVATE_KEY_METHOD *privkey_method) { 293 if (num_certs == 0 || 294 (privkey == NULL && privkey_method == NULL)) { 295 OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER); 296 return 0; 297 } 298 299 if (privkey != NULL && privkey_method != NULL) { 300 OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_HAVE_BOTH_PRIVKEY_AND_METHOD); 301 return 0; 302 } 303 304 switch (check_leaf_cert_and_privkey(certs[0], privkey)) { 305 case leaf_cert_and_privkey_error: 306 return 0; 307 case leaf_cert_and_privkey_mismatch: 308 OPENSSL_PUT_ERROR(SSL, SSL_R_CERTIFICATE_AND_PRIVATE_KEY_MISMATCH); 309 return 0; 310 case leaf_cert_and_privkey_ok: 311 break; 312 } 313 314 STACK_OF(CRYPTO_BUFFER) *certs_sk = sk_CRYPTO_BUFFER_new_null(); 315 if (certs_sk == NULL) { 316 return 0; 317 } 318 319 for (size_t i = 0; i < num_certs; i++) { 320 if (!sk_CRYPTO_BUFFER_push(certs_sk, certs[i])) { 321 sk_CRYPTO_BUFFER_pop_free(certs_sk, CRYPTO_BUFFER_free); 322 return 0; 323 } 324 CRYPTO_BUFFER_up_ref(certs[i]); 325 } 326 327 EVP_PKEY_free(cert->privatekey); 328 cert->privatekey = privkey; 329 if (privkey != NULL) { 330 EVP_PKEY_up_ref(privkey); 331 } 332 cert->key_method = privkey_method; 333 334 sk_CRYPTO_BUFFER_pop_free(cert->chain, CRYPTO_BUFFER_free); 335 cert->chain = certs_sk; 336 337 return 1; 338 } 339 340 int ssl_set_cert(CERT *cert, UniquePtr<CRYPTO_BUFFER> buffer) { 341 switch (check_leaf_cert_and_privkey(buffer.get(), cert->privatekey)) { 342 case leaf_cert_and_privkey_error: 343 return 0; 344 case leaf_cert_and_privkey_mismatch: 345 // don't fail for a cert/key mismatch, just free current private key 346 // (when switching to a different cert & key, first this function should 347 // be used, then |ssl_set_pkey|. 348 EVP_PKEY_free(cert->privatekey); 349 cert->privatekey = NULL; 350 break; 351 case leaf_cert_and_privkey_ok: 352 break; 353 } 354 355 cert->x509_method->cert_flush_cached_leaf(cert); 356 357 if (cert->chain != NULL) { 358 CRYPTO_BUFFER_free(sk_CRYPTO_BUFFER_value(cert->chain, 0)); 359 sk_CRYPTO_BUFFER_set(cert->chain, 0, buffer.release()); 360 return 1; 361 } 362 363 cert->chain = sk_CRYPTO_BUFFER_new_null(); 364 if (cert->chain == NULL) { 365 return 0; 366 } 367 368 if (!PushToStack(cert->chain, std::move(buffer))) { 369 sk_CRYPTO_BUFFER_free(cert->chain); 370 cert->chain = NULL; 371 return 0; 372 } 373 374 return 1; 375 } 376 377 int ssl_has_certificate(const SSL *ssl) { 378 return ssl->cert->chain != NULL && 379 sk_CRYPTO_BUFFER_value(ssl->cert->chain, 0) != NULL && 380 ssl_has_private_key(ssl); 381 } 382 383 bool ssl_parse_cert_chain(uint8_t *out_alert, 384 UniquePtr<STACK_OF(CRYPTO_BUFFER)> *out_chain, 385 UniquePtr<EVP_PKEY> *out_pubkey, 386 uint8_t *out_leaf_sha256, CBS *cbs, 387 CRYPTO_BUFFER_POOL *pool) { 388 out_chain->reset(); 389 out_pubkey->reset(); 390 391 CBS certificate_list; 392 if (!CBS_get_u24_length_prefixed(cbs, &certificate_list)) { 393 *out_alert = SSL_AD_DECODE_ERROR; 394 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); 395 return false; 396 } 397 398 if (CBS_len(&certificate_list) == 0) { 399 return true; 400 } 401 402 UniquePtr<STACK_OF(CRYPTO_BUFFER)> chain(sk_CRYPTO_BUFFER_new_null()); 403 if (!chain) { 404 *out_alert = SSL_AD_INTERNAL_ERROR; 405 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 406 return false; 407 } 408 409 UniquePtr<EVP_PKEY> pubkey; 410 while (CBS_len(&certificate_list) > 0) { 411 CBS certificate; 412 if (!CBS_get_u24_length_prefixed(&certificate_list, &certificate) || 413 CBS_len(&certificate) == 0) { 414 *out_alert = SSL_AD_DECODE_ERROR; 415 OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_LENGTH_MISMATCH); 416 return false; 417 } 418 419 if (sk_CRYPTO_BUFFER_num(chain.get()) == 0) { 420 pubkey = ssl_cert_parse_pubkey(&certificate); 421 if (!pubkey) { 422 *out_alert = SSL_AD_DECODE_ERROR; 423 return false; 424 } 425 426 // Retain the hash of the leaf certificate if requested. 427 if (out_leaf_sha256 != NULL) { 428 SHA256(CBS_data(&certificate), CBS_len(&certificate), out_leaf_sha256); 429 } 430 } 431 432 UniquePtr<CRYPTO_BUFFER> buf( 433 CRYPTO_BUFFER_new_from_CBS(&certificate, pool)); 434 if (!buf || 435 !PushToStack(chain.get(), std::move(buf))) { 436 *out_alert = SSL_AD_INTERNAL_ERROR; 437 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 438 return false; 439 } 440 } 441 442 *out_chain = std::move(chain); 443 *out_pubkey = std::move(pubkey); 444 return true; 445 } 446 447 int ssl_add_cert_chain(SSL *ssl, CBB *cbb) { 448 if (!ssl_has_certificate(ssl)) { 449 return CBB_add_u24(cbb, 0); 450 } 451 452 CBB certs; 453 if (!CBB_add_u24_length_prefixed(cbb, &certs)) { 454 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); 455 return 0; 456 } 457 458 STACK_OF(CRYPTO_BUFFER) *chain = ssl->cert->chain; 459 for (size_t i = 0; i < sk_CRYPTO_BUFFER_num(chain); i++) { 460 CRYPTO_BUFFER *buffer = sk_CRYPTO_BUFFER_value(chain, i); 461 CBB child; 462 if (!CBB_add_u24_length_prefixed(&certs, &child) || 463 !CBB_add_bytes(&child, CRYPTO_BUFFER_data(buffer), 464 CRYPTO_BUFFER_len(buffer)) || 465 !CBB_flush(&certs)) { 466 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); 467 return 0; 468 } 469 } 470 471 return CBB_flush(cbb); 472 } 473 474 // ssl_cert_skip_to_spki parses a DER-encoded, X.509 certificate from |in| and 475 // positions |*out_tbs_cert| to cover the TBSCertificate, starting at the 476 // subjectPublicKeyInfo. 477 static int ssl_cert_skip_to_spki(const CBS *in, CBS *out_tbs_cert) { 478 /* From RFC 5280, section 4.1 479 * Certificate ::= SEQUENCE { 480 * tbsCertificate TBSCertificate, 481 * signatureAlgorithm AlgorithmIdentifier, 482 * signatureValue BIT STRING } 483 484 * TBSCertificate ::= SEQUENCE { 485 * version [0] EXPLICIT Version DEFAULT v1, 486 * serialNumber CertificateSerialNumber, 487 * signature AlgorithmIdentifier, 488 * issuer Name, 489 * validity Validity, 490 * subject Name, 491 * subjectPublicKeyInfo SubjectPublicKeyInfo, 492 * ... } */ 493 CBS buf = *in; 494 495 CBS toplevel; 496 if (!CBS_get_asn1(&buf, &toplevel, CBS_ASN1_SEQUENCE) || 497 CBS_len(&buf) != 0 || 498 !CBS_get_asn1(&toplevel, out_tbs_cert, CBS_ASN1_SEQUENCE) || 499 // version 500 !CBS_get_optional_asn1( 501 out_tbs_cert, NULL, NULL, 502 CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) || 503 // serialNumber 504 !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_INTEGER) || 505 // signature algorithm 506 !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE) || 507 // issuer 508 !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE) || 509 // validity 510 !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE) || 511 // subject 512 !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE)) { 513 return 0; 514 } 515 516 return 1; 517 } 518 519 UniquePtr<EVP_PKEY> ssl_cert_parse_pubkey(const CBS *in) { 520 CBS buf = *in, tbs_cert; 521 if (!ssl_cert_skip_to_spki(&buf, &tbs_cert)) { 522 OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT); 523 return nullptr; 524 } 525 526 return UniquePtr<EVP_PKEY>(EVP_parse_public_key(&tbs_cert)); 527 } 528 529 int ssl_compare_public_and_private_key(const EVP_PKEY *pubkey, 530 const EVP_PKEY *privkey) { 531 if (EVP_PKEY_is_opaque(privkey)) { 532 // We cannot check an opaque private key and have to trust that it 533 // matches. 534 return 1; 535 } 536 537 int ret = 0; 538 539 switch (EVP_PKEY_cmp(pubkey, privkey)) { 540 case 1: 541 ret = 1; 542 break; 543 case 0: 544 OPENSSL_PUT_ERROR(X509, X509_R_KEY_VALUES_MISMATCH); 545 break; 546 case -1: 547 OPENSSL_PUT_ERROR(X509, X509_R_KEY_TYPE_MISMATCH); 548 break; 549 case -2: 550 OPENSSL_PUT_ERROR(X509, X509_R_UNKNOWN_KEY_TYPE); 551 break; 552 default: 553 assert(0); 554 break; 555 } 556 557 return ret; 558 } 559 560 int ssl_cert_check_private_key(const CERT *cert, const EVP_PKEY *privkey) { 561 if (privkey == NULL) { 562 OPENSSL_PUT_ERROR(SSL, SSL_R_NO_PRIVATE_KEY_ASSIGNED); 563 return 0; 564 } 565 566 if (cert->chain == NULL || 567 sk_CRYPTO_BUFFER_value(cert->chain, 0) == NULL) { 568 OPENSSL_PUT_ERROR(SSL, SSL_R_NO_CERTIFICATE_ASSIGNED); 569 return 0; 570 } 571 572 CBS cert_cbs; 573 CRYPTO_BUFFER_init_CBS(sk_CRYPTO_BUFFER_value(cert->chain, 0), &cert_cbs); 574 UniquePtr<EVP_PKEY> pubkey = ssl_cert_parse_pubkey(&cert_cbs); 575 if (!pubkey) { 576 OPENSSL_PUT_ERROR(X509, X509_R_UNKNOWN_KEY_TYPE); 577 return 0; 578 } 579 580 return ssl_compare_public_and_private_key(pubkey.get(), privkey); 581 } 582 583 int ssl_cert_check_digital_signature_key_usage(const CBS *in) { 584 CBS buf = *in; 585 586 CBS tbs_cert, outer_extensions; 587 int has_extensions; 588 if (!ssl_cert_skip_to_spki(&buf, &tbs_cert) || 589 // subjectPublicKeyInfo 590 !CBS_get_asn1(&tbs_cert, NULL, CBS_ASN1_SEQUENCE) || 591 // issuerUniqueID 592 !CBS_get_optional_asn1( 593 &tbs_cert, NULL, NULL, 594 CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 1) || 595 // subjectUniqueID 596 !CBS_get_optional_asn1( 597 &tbs_cert, NULL, NULL, 598 CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 2) || 599 !CBS_get_optional_asn1( 600 &tbs_cert, &outer_extensions, &has_extensions, 601 CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 3)) { 602 OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT); 603 return 0; 604 } 605 606 if (!has_extensions) { 607 return 1; 608 } 609 610 CBS extensions; 611 if (!CBS_get_asn1(&outer_extensions, &extensions, CBS_ASN1_SEQUENCE)) { 612 OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT); 613 return 0; 614 } 615 616 while (CBS_len(&extensions) > 0) { 617 CBS extension, oid, contents; 618 if (!CBS_get_asn1(&extensions, &extension, CBS_ASN1_SEQUENCE) || 619 !CBS_get_asn1(&extension, &oid, CBS_ASN1_OBJECT) || 620 (CBS_peek_asn1_tag(&extension, CBS_ASN1_BOOLEAN) && 621 !CBS_get_asn1(&extension, NULL, CBS_ASN1_BOOLEAN)) || 622 !CBS_get_asn1(&extension, &contents, CBS_ASN1_OCTETSTRING) || 623 CBS_len(&extension) != 0) { 624 OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT); 625 return 0; 626 } 627 628 static const uint8_t kKeyUsageOID[3] = {0x55, 0x1d, 0x0f}; 629 if (CBS_len(&oid) != sizeof(kKeyUsageOID) || 630 OPENSSL_memcmp(CBS_data(&oid), kKeyUsageOID, sizeof(kKeyUsageOID)) != 631 0) { 632 continue; 633 } 634 635 CBS bit_string; 636 if (!CBS_get_asn1(&contents, &bit_string, CBS_ASN1_BITSTRING) || 637 CBS_len(&contents) != 0) { 638 OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT); 639 return 0; 640 } 641 642 // This is the KeyUsage extension. See 643 // https://tools.ietf.org/html/rfc5280#section-4.2.1.3 644 if (!CBS_is_valid_asn1_bitstring(&bit_string)) { 645 OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT); 646 return 0; 647 } 648 649 if (!CBS_asn1_bitstring_has_bit(&bit_string, 0)) { 650 OPENSSL_PUT_ERROR(SSL, SSL_R_ECC_CERT_NOT_FOR_SIGNING); 651 return 0; 652 } 653 654 return 1; 655 } 656 657 // No KeyUsage extension found. 658 return 1; 659 } 660 661 UniquePtr<STACK_OF(CRYPTO_BUFFER)> ssl_parse_client_CA_list(SSL *ssl, 662 uint8_t *out_alert, 663 CBS *cbs) { 664 CRYPTO_BUFFER_POOL *const pool = ssl->ctx->pool; 665 666 UniquePtr<STACK_OF(CRYPTO_BUFFER)> ret(sk_CRYPTO_BUFFER_new_null()); 667 if (!ret) { 668 *out_alert = SSL_AD_INTERNAL_ERROR; 669 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 670 return nullptr; 671 } 672 673 CBS child; 674 if (!CBS_get_u16_length_prefixed(cbs, &child)) { 675 *out_alert = SSL_AD_DECODE_ERROR; 676 OPENSSL_PUT_ERROR(SSL, SSL_R_LENGTH_MISMATCH); 677 return nullptr; 678 } 679 680 while (CBS_len(&child) > 0) { 681 CBS distinguished_name; 682 if (!CBS_get_u16_length_prefixed(&child, &distinguished_name)) { 683 *out_alert = SSL_AD_DECODE_ERROR; 684 OPENSSL_PUT_ERROR(SSL, SSL_R_CA_DN_TOO_LONG); 685 return nullptr; 686 } 687 688 UniquePtr<CRYPTO_BUFFER> buffer( 689 CRYPTO_BUFFER_new_from_CBS(&distinguished_name, pool)); 690 if (!buffer || 691 !PushToStack(ret.get(), std::move(buffer))) { 692 *out_alert = SSL_AD_INTERNAL_ERROR; 693 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 694 return nullptr; 695 } 696 } 697 698 if (!ssl->ctx->x509_method->check_client_CA_list(ret.get())) { 699 *out_alert = SSL_AD_INTERNAL_ERROR; 700 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); 701 return nullptr; 702 } 703 704 return ret; 705 } 706 707 bool ssl_has_client_CAs(SSL *ssl) { 708 STACK_OF(CRYPTO_BUFFER) *names = ssl->client_CA; 709 if (names == NULL) { 710 names = ssl->ctx->client_CA; 711 } 712 if (names == NULL) { 713 return false; 714 } 715 return sk_CRYPTO_BUFFER_num(names) > 0; 716 } 717 718 int ssl_add_client_CA_list(SSL *ssl, CBB *cbb) { 719 CBB child, name_cbb; 720 if (!CBB_add_u16_length_prefixed(cbb, &child)) { 721 return 0; 722 } 723 724 STACK_OF(CRYPTO_BUFFER) *names = ssl->client_CA; 725 if (names == NULL) { 726 names = ssl->ctx->client_CA; 727 } 728 if (names == NULL) { 729 return CBB_flush(cbb); 730 } 731 732 for (const CRYPTO_BUFFER *name : names) { 733 if (!CBB_add_u16_length_prefixed(&child, &name_cbb) || 734 !CBB_add_bytes(&name_cbb, CRYPTO_BUFFER_data(name), 735 CRYPTO_BUFFER_len(name))) { 736 return 0; 737 } 738 } 739 740 return CBB_flush(cbb); 741 } 742 743 int ssl_check_leaf_certificate(SSL_HANDSHAKE *hs, EVP_PKEY *pkey, 744 const CRYPTO_BUFFER *leaf) { 745 SSL *const ssl = hs->ssl; 746 assert(ssl_protocol_version(ssl) < TLS1_3_VERSION); 747 748 // Check the certificate's type matches the cipher. 749 if (!(hs->new_cipher->algorithm_auth & ssl_cipher_auth_mask_for_key(pkey))) { 750 OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CERTIFICATE_TYPE); 751 return 0; 752 } 753 754 // Check key usages for all key types but RSA. This is needed to distinguish 755 // ECDH certificates, which we do not support, from ECDSA certificates. In 756 // principle, we should check RSA key usages based on cipher, but this breaks 757 // buggy antivirus deployments. Other key types are always used for signing. 758 // 759 // TODO(davidben): Get more recent data on RSA key usages. 760 if (EVP_PKEY_id(pkey) != EVP_PKEY_RSA) { 761 CBS leaf_cbs; 762 CBS_init(&leaf_cbs, CRYPTO_BUFFER_data(leaf), CRYPTO_BUFFER_len(leaf)); 763 if (!ssl_cert_check_digital_signature_key_usage(&leaf_cbs)) { 764 return 0; 765 } 766 } 767 768 if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) { 769 // Check the key's group and point format are acceptable. 770 EC_KEY *ec_key = EVP_PKEY_get0_EC_KEY(pkey); 771 uint16_t group_id; 772 if (!ssl_nid_to_group_id( 773 &group_id, EC_GROUP_get_curve_name(EC_KEY_get0_group(ec_key))) || 774 !tls1_check_group_id(ssl, group_id) || 775 EC_KEY_get_conv_form(ec_key) != POINT_CONVERSION_UNCOMPRESSED) { 776 OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_ECC_CERT); 777 return 0; 778 } 779 } 780 781 return 1; 782 } 783 784 int ssl_on_certificate_selected(SSL_HANDSHAKE *hs) { 785 SSL *const ssl = hs->ssl; 786 if (!ssl_has_certificate(ssl)) { 787 // Nothing to do. 788 return 1; 789 } 790 791 if (!ssl->ctx->x509_method->ssl_auto_chain_if_needed(ssl)) { 792 return 0; 793 } 794 795 CBS leaf; 796 CRYPTO_BUFFER_init_CBS(sk_CRYPTO_BUFFER_value(ssl->cert->chain, 0), &leaf); 797 798 hs->local_pubkey = ssl_cert_parse_pubkey(&leaf); 799 return hs->local_pubkey != NULL; 800 } 801 802 } // namespace bssl 803 804 using namespace bssl; 805 806 int SSL_set_chain_and_key(SSL *ssl, CRYPTO_BUFFER *const *certs, 807 size_t num_certs, EVP_PKEY *privkey, 808 const SSL_PRIVATE_KEY_METHOD *privkey_method) { 809 return cert_set_chain_and_key(ssl->cert, certs, num_certs, privkey, 810 privkey_method); 811 } 812 813 int SSL_CTX_set_chain_and_key(SSL_CTX *ctx, CRYPTO_BUFFER *const *certs, 814 size_t num_certs, EVP_PKEY *privkey, 815 const SSL_PRIVATE_KEY_METHOD *privkey_method) { 816 return cert_set_chain_and_key(ctx->cert, certs, num_certs, privkey, 817 privkey_method); 818 } 819 820 int SSL_CTX_use_certificate_ASN1(SSL_CTX *ctx, size_t der_len, 821 const uint8_t *der) { 822 UniquePtr<CRYPTO_BUFFER> buffer(CRYPTO_BUFFER_new(der, der_len, NULL)); 823 if (!buffer) { 824 return 0; 825 } 826 827 return ssl_set_cert(ctx->cert, std::move(buffer)); 828 } 829 830 int SSL_use_certificate_ASN1(SSL *ssl, const uint8_t *der, size_t der_len) { 831 UniquePtr<CRYPTO_BUFFER> buffer(CRYPTO_BUFFER_new(der, der_len, NULL)); 832 if (!buffer) { 833 return 0; 834 } 835 836 return ssl_set_cert(ssl->cert, std::move(buffer)); 837 } 838 839 void SSL_CTX_set_cert_cb(SSL_CTX *ctx, int (*cb)(SSL *ssl, void *arg), 840 void *arg) { 841 ssl_cert_set_cert_cb(ctx->cert, cb, arg); 842 } 843 844 void SSL_set_cert_cb(SSL *ssl, int (*cb)(SSL *ssl, void *arg), void *arg) { 845 ssl_cert_set_cert_cb(ssl->cert, cb, arg); 846 } 847 848 STACK_OF(CRYPTO_BUFFER) *SSL_get0_peer_certificates(const SSL *ssl) { 849 SSL_SESSION *session = SSL_get_session(ssl); 850 if (session == NULL) { 851 return NULL; 852 } 853 854 return session->certs; 855 } 856 857 STACK_OF(CRYPTO_BUFFER) *SSL_get0_server_requested_CAs(const SSL *ssl) { 858 if (ssl->s3->hs == NULL) { 859 return NULL; 860 } 861 return ssl->s3->hs->ca_names.get(); 862 } 863 864 static int set_signed_cert_timestamp_list(CERT *cert, const uint8_t *list, 865 size_t list_len) { 866 CBS sct_list; 867 CBS_init(&sct_list, list, list_len); 868 if (!ssl_is_sct_list_valid(&sct_list)) { 869 OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SCT_LIST); 870 return 0; 871 } 872 873 CRYPTO_BUFFER_free(cert->signed_cert_timestamp_list); 874 cert->signed_cert_timestamp_list = 875 CRYPTO_BUFFER_new(CBS_data(&sct_list), CBS_len(&sct_list), NULL); 876 return cert->signed_cert_timestamp_list != NULL; 877 } 878 879 int SSL_CTX_set_signed_cert_timestamp_list(SSL_CTX *ctx, const uint8_t *list, 880 size_t list_len) { 881 return set_signed_cert_timestamp_list(ctx->cert, list, list_len); 882 } 883 884 int SSL_set_signed_cert_timestamp_list(SSL *ssl, const uint8_t *list, 885 size_t list_len) { 886 return set_signed_cert_timestamp_list(ssl->cert, list, list_len); 887 } 888 889 int SSL_CTX_set_ocsp_response(SSL_CTX *ctx, const uint8_t *response, 890 size_t response_len) { 891 CRYPTO_BUFFER_free(ctx->cert->ocsp_response); 892 ctx->cert->ocsp_response = CRYPTO_BUFFER_new(response, response_len, NULL); 893 return ctx->cert->ocsp_response != NULL; 894 } 895 896 int SSL_set_ocsp_response(SSL *ssl, const uint8_t *response, 897 size_t response_len) { 898 CRYPTO_BUFFER_free(ssl->cert->ocsp_response); 899 ssl->cert->ocsp_response = CRYPTO_BUFFER_new(response, response_len, NULL); 900 return ssl->cert->ocsp_response != NULL; 901 } 902 903 void SSL_CTX_set0_client_CAs(SSL_CTX *ctx, STACK_OF(CRYPTO_BUFFER) *name_list) { 904 ctx->x509_method->ssl_ctx_flush_cached_client_CA(ctx); 905 sk_CRYPTO_BUFFER_pop_free(ctx->client_CA, CRYPTO_BUFFER_free); 906 ctx->client_CA = name_list; 907 } 908 909 void SSL_set0_client_CAs(SSL *ssl, STACK_OF(CRYPTO_BUFFER) *name_list) { 910 ssl->ctx->x509_method->ssl_flush_cached_client_CA(ssl); 911 sk_CRYPTO_BUFFER_pop_free(ssl->client_CA, CRYPTO_BUFFER_free); 912 ssl->client_CA = name_list; 913 } 914
