1/* 2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved. 3 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved 4 * Copyright 2005 Nokia. All rights reserved. 5 * 6 * Licensed under the OpenSSL license (the "License"). You may not use 7 * this file except in compliance with the License. You can obtain a copy 8 * in the file LICENSE in the source distribution or at 9 * https://www.openssl.org/source/license.html 10 */ 11 12#include <stdio.h> 13#include "../ssl_local.h" 14#include "statem_local.h" 15#include "internal/constant_time.h" 16#include "internal/cryptlib.h" 17#include <openssl/buffer.h> 18#include <openssl/rand.h> 19#include <openssl/objects.h> 20#include <openssl/evp.h> 21#include <openssl/hmac.h> 22#include <openssl/x509.h> 23#include <openssl/dh.h> 24#include <openssl/bn.h> 25#include <openssl/md5.h> 26#include <openssl/asn1t.h> 27 28#define TICKET_NONCE_SIZE 8 29 30typedef struct { 31 ASN1_TYPE *kxBlob; 32 ASN1_TYPE *opaqueBlob; 33} GOST_KX_MESSAGE; 34 35DECLARE_ASN1_FUNCTIONS(GOST_KX_MESSAGE) 36 37ASN1_SEQUENCE(GOST_KX_MESSAGE) = { 38 ASN1_SIMPLE(GOST_KX_MESSAGE, kxBlob, ASN1_ANY), 39 ASN1_OPT(GOST_KX_MESSAGE, opaqueBlob, ASN1_ANY), 40} ASN1_SEQUENCE_END(GOST_KX_MESSAGE) 41 42IMPLEMENT_ASN1_FUNCTIONS(GOST_KX_MESSAGE) 43 44static int tls_construct_encrypted_extensions(SSL *s, WPACKET *pkt); 45 46/* 47 * ossl_statem_server13_read_transition() encapsulates the logic for the allowed 48 * handshake state transitions when a TLSv1.3 server is reading messages from 49 * the client. The message type that the client has sent is provided in |mt|. 50 * The current state is in |s->statem.hand_state|. 51 * 52 * Return values are 1 for success (transition allowed) and 0 on error 53 * (transition not allowed) 54 */ 55static int ossl_statem_server13_read_transition(SSL *s, int mt) 56{ 57 OSSL_STATEM *st = &s->statem; 58 59 /* 60 * Note: There is no case for TLS_ST_BEFORE because at that stage we have 61 * not negotiated TLSv1.3 yet, so that case is handled by 62 * ossl_statem_server_read_transition() 63 */ 64 switch (st->hand_state) { 65 default: 66 break; 67 68 case TLS_ST_EARLY_DATA: 69 if (s->hello_retry_request == SSL_HRR_PENDING) { 70 if (mt == SSL3_MT_CLIENT_HELLO) { 71 st->hand_state = TLS_ST_SR_CLNT_HELLO; 72 return 1; 73 } 74 break; 75 } else if (s->ext.early_data == SSL_EARLY_DATA_ACCEPTED) { 76 if (mt == SSL3_MT_END_OF_EARLY_DATA) { 77 st->hand_state = TLS_ST_SR_END_OF_EARLY_DATA; 78 return 1; 79 } 80 break; 81 } 82 /* Fall through */ 83 84 case TLS_ST_SR_END_OF_EARLY_DATA: 85 case TLS_ST_SW_FINISHED: 86 if (s->s3->tmp.cert_request) { 87 if (mt == SSL3_MT_CERTIFICATE) { 88 st->hand_state = TLS_ST_SR_CERT; 89 return 1; 90 } 91 } else { 92 if (mt == SSL3_MT_FINISHED) { 93 st->hand_state = TLS_ST_SR_FINISHED; 94 return 1; 95 } 96 } 97 break; 98 99 case TLS_ST_SR_CERT: 100 if (s->session->peer == NULL) { 101 if (mt == SSL3_MT_FINISHED) { 102 st->hand_state = TLS_ST_SR_FINISHED; 103 return 1; 104 } 105 } else { 106 if (mt == SSL3_MT_CERTIFICATE_VERIFY) { 107 st->hand_state = TLS_ST_SR_CERT_VRFY; 108 return 1; 109 } 110 } 111 break; 112 113 case TLS_ST_SR_CERT_VRFY: 114 if (mt == SSL3_MT_FINISHED) { 115 st->hand_state = TLS_ST_SR_FINISHED; 116 return 1; 117 } 118 break; 119 120 case TLS_ST_OK: 121 /* 122 * Its never ok to start processing handshake messages in the middle of 123 * early data (i.e. before we've received the end of early data alert) 124 */ 125 if (s->early_data_state == SSL_EARLY_DATA_READING) 126 break; 127 128 if (mt == SSL3_MT_CERTIFICATE 129 && s->post_handshake_auth == SSL_PHA_REQUESTED) { 130 st->hand_state = TLS_ST_SR_CERT; 131 return 1; 132 } 133 134 if (mt == SSL3_MT_KEY_UPDATE) { 135 st->hand_state = TLS_ST_SR_KEY_UPDATE; 136 return 1; 137 } 138 break; 139 } 140 141 /* No valid transition found */ 142 return 0; 143} 144 145/* 146 * ossl_statem_server_read_transition() encapsulates the logic for the allowed 147 * handshake state transitions when the server is reading messages from the 148 * client. The message type that the client has sent is provided in |mt|. The 149 * current state is in |s->statem.hand_state|. 150 * 151 * Return values are 1 for success (transition allowed) and 0 on error 152 * (transition not allowed) 153 */ 154int ossl_statem_server_read_transition(SSL *s, int mt) 155{ 156 OSSL_STATEM *st = &s->statem; 157 158 if (SSL_IS_TLS13(s)) { 159 if (!ossl_statem_server13_read_transition(s, mt)) 160 goto err; 161 return 1; 162 } 163 164 switch (st->hand_state) { 165 default: 166 break; 167 168 case TLS_ST_BEFORE: 169 case TLS_ST_OK: 170 case DTLS_ST_SW_HELLO_VERIFY_REQUEST: 171 if (mt == SSL3_MT_CLIENT_HELLO) { 172 st->hand_state = TLS_ST_SR_CLNT_HELLO; 173 return 1; 174 } 175 break; 176 177 case TLS_ST_SW_SRVR_DONE: 178 /* 179 * If we get a CKE message after a ServerDone then either 180 * 1) We didn't request a Certificate 181 * OR 182 * 2) If we did request one then 183 * a) We allow no Certificate to be returned 184 * AND 185 * b) We are running SSL3 (in TLS1.0+ the client must return a 0 186 * list if we requested a certificate) 187 */ 188 if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) { 189 if (s->s3->tmp.cert_request) { 190 if (s->version == SSL3_VERSION) { 191 if ((s->verify_mode & SSL_VERIFY_PEER) 192 && (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 193 /* 194 * This isn't an unexpected message as such - we're just 195 * not going to accept it because we require a client 196 * cert. 197 */ 198 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 199 SSL_F_OSSL_STATEM_SERVER_READ_TRANSITION, 200 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 201 return 0; 202 } 203 st->hand_state = TLS_ST_SR_KEY_EXCH; 204 return 1; 205 } 206 } else { 207 st->hand_state = TLS_ST_SR_KEY_EXCH; 208 return 1; 209 } 210 } else if (s->s3->tmp.cert_request) { 211 if (mt == SSL3_MT_CERTIFICATE) { 212 st->hand_state = TLS_ST_SR_CERT; 213 return 1; 214 } 215 } 216 break; 217 218 case TLS_ST_SR_CERT: 219 if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) { 220 st->hand_state = TLS_ST_SR_KEY_EXCH; 221 return 1; 222 } 223 break; 224 225 case TLS_ST_SR_KEY_EXCH: 226 /* 227 * We should only process a CertificateVerify message if we have 228 * received a Certificate from the client. If so then |s->session->peer| 229 * will be non NULL. In some instances a CertificateVerify message is 230 * not required even if the peer has sent a Certificate (e.g. such as in 231 * the case of static DH). In that case |st->no_cert_verify| should be 232 * set. 233 */ 234 if (s->session->peer == NULL || st->no_cert_verify) { 235 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { 236 /* 237 * For the ECDH ciphersuites when the client sends its ECDH 238 * pub key in a certificate, the CertificateVerify message is 239 * not sent. Also for GOST ciphersuites when the client uses 240 * its key from the certificate for key exchange. 241 */ 242 st->hand_state = TLS_ST_SR_CHANGE; 243 return 1; 244 } 245 } else { 246 if (mt == SSL3_MT_CERTIFICATE_VERIFY) { 247 st->hand_state = TLS_ST_SR_CERT_VRFY; 248 return 1; 249 } 250 } 251 break; 252 253 case TLS_ST_SR_CERT_VRFY: 254 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { 255 st->hand_state = TLS_ST_SR_CHANGE; 256 return 1; 257 } 258 break; 259 260 case TLS_ST_SR_CHANGE: 261#ifndef OPENSSL_NO_NEXTPROTONEG 262 if (s->s3->npn_seen) { 263 if (mt == SSL3_MT_NEXT_PROTO) { 264 st->hand_state = TLS_ST_SR_NEXT_PROTO; 265 return 1; 266 } 267 } else { 268#endif 269 if (mt == SSL3_MT_FINISHED) { 270 st->hand_state = TLS_ST_SR_FINISHED; 271 return 1; 272 } 273#ifndef OPENSSL_NO_NEXTPROTONEG 274 } 275#endif 276 break; 277 278#ifndef OPENSSL_NO_NEXTPROTONEG 279 case TLS_ST_SR_NEXT_PROTO: 280 if (mt == SSL3_MT_FINISHED) { 281 st->hand_state = TLS_ST_SR_FINISHED; 282 return 1; 283 } 284 break; 285#endif 286 287 case TLS_ST_SW_FINISHED: 288 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { 289 st->hand_state = TLS_ST_SR_CHANGE; 290 return 1; 291 } 292 break; 293 } 294 295 err: 296 /* No valid transition found */ 297 if (SSL_IS_DTLS(s) && mt == SSL3_MT_CHANGE_CIPHER_SPEC) { 298 BIO *rbio; 299 300 /* 301 * CCS messages don't have a message sequence number so this is probably 302 * because of an out-of-order CCS. We'll just drop it. 303 */ 304 s->init_num = 0; 305 s->rwstate = SSL_READING; 306 rbio = SSL_get_rbio(s); 307 BIO_clear_retry_flags(rbio); 308 BIO_set_retry_read(rbio); 309 return 0; 310 } 311 SSLfatal(s, SSL3_AD_UNEXPECTED_MESSAGE, 312 SSL_F_OSSL_STATEM_SERVER_READ_TRANSITION, 313 SSL_R_UNEXPECTED_MESSAGE); 314 return 0; 315} 316 317/* 318 * Should we send a ServerKeyExchange message? 319 * 320 * Valid return values are: 321 * 1: Yes 322 * 0: No 323 */ 324static int send_server_key_exchange(SSL *s) 325{ 326 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 327 328 /* 329 * only send a ServerKeyExchange if DH or fortezza but we have a 330 * sign only certificate PSK: may send PSK identity hints For 331 * ECC ciphersuites, we send a serverKeyExchange message only if 332 * the cipher suite is either ECDH-anon or ECDHE. In other cases, 333 * the server certificate contains the server's public key for 334 * key exchange. 335 */ 336 if (alg_k & (SSL_kDHE | SSL_kECDHE) 337 /* 338 * PSK: send ServerKeyExchange if PSK identity hint if 339 * provided 340 */ 341#ifndef OPENSSL_NO_PSK 342 /* Only send SKE if we have identity hint for plain PSK */ 343 || ((alg_k & (SSL_kPSK | SSL_kRSAPSK)) 344 && s->cert->psk_identity_hint) 345 /* For other PSK always send SKE */ 346 || (alg_k & (SSL_PSK & (SSL_kDHEPSK | SSL_kECDHEPSK))) 347#endif 348#ifndef OPENSSL_NO_SRP 349 /* SRP: send ServerKeyExchange */ 350 || (alg_k & SSL_kSRP) 351#endif 352 ) { 353 return 1; 354 } 355 356 return 0; 357} 358 359/* 360 * Should we send a CertificateRequest message? 361 * 362 * Valid return values are: 363 * 1: Yes 364 * 0: No 365 */ 366int send_certificate_request(SSL *s) 367{ 368 if ( 369 /* don't request cert unless asked for it: */ 370 s->verify_mode & SSL_VERIFY_PEER 371 /* 372 * don't request if post-handshake-only unless doing 373 * post-handshake in TLSv1.3: 374 */ 375 && (!SSL_IS_TLS13(s) || !(s->verify_mode & SSL_VERIFY_POST_HANDSHAKE) 376 || s->post_handshake_auth == SSL_PHA_REQUEST_PENDING) 377 /* 378 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert 379 * a second time: 380 */ 381 && (s->certreqs_sent < 1 || 382 !(s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) 383 /* 384 * never request cert in anonymous ciphersuites (see 385 * section "Certificate request" in SSL 3 drafts and in 386 * RFC 2246): 387 */ 388 && (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 389 /* 390 * ... except when the application insists on 391 * verification (against the specs, but statem_clnt.c accepts 392 * this for SSL 3) 393 */ 394 || (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) 395 /* don't request certificate for SRP auth */ 396 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP) 397 /* 398 * With normal PSK Certificates and Certificate Requests 399 * are omitted 400 */ 401 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aPSK)) { 402 return 1; 403 } 404 405 return 0; 406} 407 408/* 409 * ossl_statem_server13_write_transition() works out what handshake state to 410 * move to next when a TLSv1.3 server is writing messages to be sent to the 411 * client. 412 */ 413static WRITE_TRAN ossl_statem_server13_write_transition(SSL *s) 414{ 415 OSSL_STATEM *st = &s->statem; 416 417 /* 418 * No case for TLS_ST_BEFORE, because at that stage we have not negotiated 419 * TLSv1.3 yet, so that is handled by ossl_statem_server_write_transition() 420 */ 421 422 switch (st->hand_state) { 423 default: 424 /* Shouldn't happen */ 425 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 426 SSL_F_OSSL_STATEM_SERVER13_WRITE_TRANSITION, 427 ERR_R_INTERNAL_ERROR); 428 return WRITE_TRAN_ERROR; 429 430 case TLS_ST_OK: 431 if (s->key_update != SSL_KEY_UPDATE_NONE) { 432 st->hand_state = TLS_ST_SW_KEY_UPDATE; 433 return WRITE_TRAN_CONTINUE; 434 } 435 if (s->post_handshake_auth == SSL_PHA_REQUEST_PENDING) { 436 st->hand_state = TLS_ST_SW_CERT_REQ; 437 return WRITE_TRAN_CONTINUE; 438 } 439 /* Try to read from the client instead */ 440 return WRITE_TRAN_FINISHED; 441 442 case TLS_ST_SR_CLNT_HELLO: 443 st->hand_state = TLS_ST_SW_SRVR_HELLO; 444 return WRITE_TRAN_CONTINUE; 445 446 case TLS_ST_SW_SRVR_HELLO: 447 if ((s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) != 0 448 && s->hello_retry_request != SSL_HRR_COMPLETE) 449 st->hand_state = TLS_ST_SW_CHANGE; 450 else if (s->hello_retry_request == SSL_HRR_PENDING) 451 st->hand_state = TLS_ST_EARLY_DATA; 452 else 453 st->hand_state = TLS_ST_SW_ENCRYPTED_EXTENSIONS; 454 return WRITE_TRAN_CONTINUE; 455 456 case TLS_ST_SW_CHANGE: 457 if (s->hello_retry_request == SSL_HRR_PENDING) 458 st->hand_state = TLS_ST_EARLY_DATA; 459 else 460 st->hand_state = TLS_ST_SW_ENCRYPTED_EXTENSIONS; 461 return WRITE_TRAN_CONTINUE; 462 463 case TLS_ST_SW_ENCRYPTED_EXTENSIONS: 464 if (s->hit) 465 st->hand_state = TLS_ST_SW_FINISHED; 466 else if (send_certificate_request(s)) 467 st->hand_state = TLS_ST_SW_CERT_REQ; 468 else 469 st->hand_state = TLS_ST_SW_CERT; 470 471 return WRITE_TRAN_CONTINUE; 472 473 case TLS_ST_SW_CERT_REQ: 474 if (s->post_handshake_auth == SSL_PHA_REQUEST_PENDING) { 475 s->post_handshake_auth = SSL_PHA_REQUESTED; 476 st->hand_state = TLS_ST_OK; 477 } else { 478 st->hand_state = TLS_ST_SW_CERT; 479 } 480 return WRITE_TRAN_CONTINUE; 481 482 case TLS_ST_SW_CERT: 483 st->hand_state = TLS_ST_SW_CERT_VRFY; 484 return WRITE_TRAN_CONTINUE; 485 486 case TLS_ST_SW_CERT_VRFY: 487 st->hand_state = TLS_ST_SW_FINISHED; 488 return WRITE_TRAN_CONTINUE; 489 490 case TLS_ST_SW_FINISHED: 491 st->hand_state = TLS_ST_EARLY_DATA; 492 return WRITE_TRAN_CONTINUE; 493 494 case TLS_ST_EARLY_DATA: 495 return WRITE_TRAN_FINISHED; 496 497 case TLS_ST_SR_FINISHED: 498 /* 499 * Technically we have finished the handshake at this point, but we're 500 * going to remain "in_init" for now and write out any session tickets 501 * immediately. 502 */ 503 if (s->post_handshake_auth == SSL_PHA_REQUESTED) { 504 s->post_handshake_auth = SSL_PHA_EXT_RECEIVED; 505 } else if (!s->ext.ticket_expected) { 506 /* 507 * If we're not going to renew the ticket then we just finish the 508 * handshake at this point. 509 */ 510 st->hand_state = TLS_ST_OK; 511 return WRITE_TRAN_CONTINUE; 512 } 513 if (s->num_tickets > s->sent_tickets) 514 st->hand_state = TLS_ST_SW_SESSION_TICKET; 515 else 516 st->hand_state = TLS_ST_OK; 517 return WRITE_TRAN_CONTINUE; 518 519 case TLS_ST_SR_KEY_UPDATE: 520 case TLS_ST_SW_KEY_UPDATE: 521 st->hand_state = TLS_ST_OK; 522 return WRITE_TRAN_CONTINUE; 523 524 case TLS_ST_SW_SESSION_TICKET: 525 /* In a resumption we only ever send a maximum of one new ticket. 526 * Following an initial handshake we send the number of tickets we have 527 * been configured for. 528 */ 529 if (s->hit || s->num_tickets <= s->sent_tickets) { 530 /* We've written enough tickets out. */ 531 st->hand_state = TLS_ST_OK; 532 } 533 return WRITE_TRAN_CONTINUE; 534 } 535} 536 537/* 538 * ossl_statem_server_write_transition() works out what handshake state to move 539 * to next when the server is writing messages to be sent to the client. 540 */ 541WRITE_TRAN ossl_statem_server_write_transition(SSL *s) 542{ 543 OSSL_STATEM *st = &s->statem; 544 545 /* 546 * Note that before the ClientHello we don't know what version we are going 547 * to negotiate yet, so we don't take this branch until later 548 */ 549 550 if (SSL_IS_TLS13(s)) 551 return ossl_statem_server13_write_transition(s); 552 553 switch (st->hand_state) { 554 default: 555 /* Shouldn't happen */ 556 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 557 SSL_F_OSSL_STATEM_SERVER_WRITE_TRANSITION, 558 ERR_R_INTERNAL_ERROR); 559 return WRITE_TRAN_ERROR; 560 561 case TLS_ST_OK: 562 if (st->request_state == TLS_ST_SW_HELLO_REQ) { 563 /* We must be trying to renegotiate */ 564 st->hand_state = TLS_ST_SW_HELLO_REQ; 565 st->request_state = TLS_ST_BEFORE; 566 return WRITE_TRAN_CONTINUE; 567 } 568 /* Must be an incoming ClientHello */ 569 if (!tls_setup_handshake(s)) { 570 /* SSLfatal() already called */ 571 return WRITE_TRAN_ERROR; 572 } 573 /* Fall through */ 574 575 case TLS_ST_BEFORE: 576 /* Just go straight to trying to read from the client */ 577 return WRITE_TRAN_FINISHED; 578 579 case TLS_ST_SW_HELLO_REQ: 580 st->hand_state = TLS_ST_OK; 581 return WRITE_TRAN_CONTINUE; 582 583 case TLS_ST_SR_CLNT_HELLO: 584 if (SSL_IS_DTLS(s) && !s->d1->cookie_verified 585 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) { 586 st->hand_state = DTLS_ST_SW_HELLO_VERIFY_REQUEST; 587 } else if (s->renegotiate == 0 && !SSL_IS_FIRST_HANDSHAKE(s)) { 588 /* We must have rejected the renegotiation */ 589 st->hand_state = TLS_ST_OK; 590 return WRITE_TRAN_CONTINUE; 591 } else { 592 st->hand_state = TLS_ST_SW_SRVR_HELLO; 593 } 594 return WRITE_TRAN_CONTINUE; 595 596 case DTLS_ST_SW_HELLO_VERIFY_REQUEST: 597 return WRITE_TRAN_FINISHED; 598 599 case TLS_ST_SW_SRVR_HELLO: 600 if (s->hit) { 601 if (s->ext.ticket_expected) 602 st->hand_state = TLS_ST_SW_SESSION_TICKET; 603 else 604 st->hand_state = TLS_ST_SW_CHANGE; 605 } else { 606 /* Check if it is anon DH or anon ECDH, */ 607 /* normal PSK or SRP */ 608 if (!(s->s3->tmp.new_cipher->algorithm_auth & 609 (SSL_aNULL | SSL_aSRP | SSL_aPSK))) { 610 st->hand_state = TLS_ST_SW_CERT; 611 } else if (send_server_key_exchange(s)) { 612 st->hand_state = TLS_ST_SW_KEY_EXCH; 613 } else if (send_certificate_request(s)) { 614 st->hand_state = TLS_ST_SW_CERT_REQ; 615 } else { 616 st->hand_state = TLS_ST_SW_SRVR_DONE; 617 } 618 } 619 return WRITE_TRAN_CONTINUE; 620 621 case TLS_ST_SW_CERT: 622 if (s->ext.status_expected) { 623 st->hand_state = TLS_ST_SW_CERT_STATUS; 624 return WRITE_TRAN_CONTINUE; 625 } 626 /* Fall through */ 627 628 case TLS_ST_SW_CERT_STATUS: 629 if (send_server_key_exchange(s)) { 630 st->hand_state = TLS_ST_SW_KEY_EXCH; 631 return WRITE_TRAN_CONTINUE; 632 } 633 /* Fall through */ 634 635 case TLS_ST_SW_KEY_EXCH: 636 if (send_certificate_request(s)) { 637 st->hand_state = TLS_ST_SW_CERT_REQ; 638 return WRITE_TRAN_CONTINUE; 639 } 640 /* Fall through */ 641 642 case TLS_ST_SW_CERT_REQ: 643 st->hand_state = TLS_ST_SW_SRVR_DONE; 644 return WRITE_TRAN_CONTINUE; 645 646 case TLS_ST_SW_SRVR_DONE: 647 return WRITE_TRAN_FINISHED; 648 649 case TLS_ST_SR_FINISHED: 650 if (s->hit) { 651 st->hand_state = TLS_ST_OK; 652 return WRITE_TRAN_CONTINUE; 653 } else if (s->ext.ticket_expected) { 654 st->hand_state = TLS_ST_SW_SESSION_TICKET; 655 } else { 656 st->hand_state = TLS_ST_SW_CHANGE; 657 } 658 return WRITE_TRAN_CONTINUE; 659 660 case TLS_ST_SW_SESSION_TICKET: 661 st->hand_state = TLS_ST_SW_CHANGE; 662 return WRITE_TRAN_CONTINUE; 663 664 case TLS_ST_SW_CHANGE: 665 st->hand_state = TLS_ST_SW_FINISHED; 666 return WRITE_TRAN_CONTINUE; 667 668 case TLS_ST_SW_FINISHED: 669 if (s->hit) { 670 return WRITE_TRAN_FINISHED; 671 } 672 st->hand_state = TLS_ST_OK; 673 return WRITE_TRAN_CONTINUE; 674 } 675} 676 677/* 678 * Perform any pre work that needs to be done prior to sending a message from 679 * the server to the client. 680 */ 681WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst) 682{ 683 OSSL_STATEM *st = &s->statem; 684 685 switch (st->hand_state) { 686 default: 687 /* No pre work to be done */ 688 break; 689 690 case TLS_ST_SW_HELLO_REQ: 691 s->shutdown = 0; 692 if (SSL_IS_DTLS(s)) 693 dtls1_clear_sent_buffer(s); 694 break; 695 696 case DTLS_ST_SW_HELLO_VERIFY_REQUEST: 697 s->shutdown = 0; 698 if (SSL_IS_DTLS(s)) { 699 dtls1_clear_sent_buffer(s); 700 /* We don't buffer this message so don't use the timer */ 701 st->use_timer = 0; 702 } 703 break; 704 705 case TLS_ST_SW_SRVR_HELLO: 706 if (SSL_IS_DTLS(s)) { 707 /* 708 * Messages we write from now on should be buffered and 709 * retransmitted if necessary, so we need to use the timer now 710 */ 711 st->use_timer = 1; 712 } 713 break; 714 715 case TLS_ST_SW_SRVR_DONE: 716#ifndef OPENSSL_NO_SCTP 717 if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))) { 718 /* Calls SSLfatal() as required */ 719 return dtls_wait_for_dry(s); 720 } 721#endif 722 return WORK_FINISHED_CONTINUE; 723 724 case TLS_ST_SW_SESSION_TICKET: 725 if (SSL_IS_TLS13(s) && s->sent_tickets == 0) { 726 /* 727 * Actually this is the end of the handshake, but we're going 728 * straight into writing the session ticket out. So we finish off 729 * the handshake, but keep the various buffers active. 730 * 731 * Calls SSLfatal as required. 732 */ 733 return tls_finish_handshake(s, wst, 0, 0); 734 } if (SSL_IS_DTLS(s)) { 735 /* 736 * We're into the last flight. We don't retransmit the last flight 737 * unless we need to, so we don't use the timer 738 */ 739 st->use_timer = 0; 740 } 741 break; 742 743 case TLS_ST_SW_CHANGE: 744 if (SSL_IS_TLS13(s)) 745 break; 746 /* Writes to s->session are only safe for initial handshakes */ 747 if (s->session->cipher == NULL) { 748 s->session->cipher = s->s3->tmp.new_cipher; 749 } else if (s->session->cipher != s->s3->tmp.new_cipher) { 750 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 751 SSL_F_OSSL_STATEM_SERVER_PRE_WORK, 752 ERR_R_INTERNAL_ERROR); 753 return WORK_ERROR; 754 } 755 if (!s->method->ssl3_enc->setup_key_block(s)) { 756 /* SSLfatal() already called */ 757 return WORK_ERROR; 758 } 759 if (SSL_IS_DTLS(s)) { 760 /* 761 * We're into the last flight. We don't retransmit the last flight 762 * unless we need to, so we don't use the timer. This might have 763 * already been set to 0 if we sent a NewSessionTicket message, 764 * but we'll set it again here in case we didn't. 765 */ 766 st->use_timer = 0; 767 } 768 return WORK_FINISHED_CONTINUE; 769 770 case TLS_ST_EARLY_DATA: 771 if (s->early_data_state != SSL_EARLY_DATA_ACCEPTING 772 && (s->s3->flags & TLS1_FLAGS_STATELESS) == 0) 773 return WORK_FINISHED_CONTINUE; 774 /* Fall through */ 775 776 case TLS_ST_OK: 777 /* Calls SSLfatal() as required */ 778 return tls_finish_handshake(s, wst, 1, 1); 779 } 780 781 return WORK_FINISHED_CONTINUE; 782} 783 784static ossl_inline int conn_is_closed(void) 785{ 786 switch (get_last_sys_error()) { 787#if defined(EPIPE) 788 case EPIPE: 789 return 1; 790#endif 791#if defined(ECONNRESET) 792 case ECONNRESET: 793 return 1; 794#endif 795#if defined(WSAECONNRESET) 796 case WSAECONNRESET: 797 return 1; 798#endif 799 default: 800 return 0; 801 } 802} 803 804/* 805 * Perform any work that needs to be done after sending a message from the 806 * server to the client. 807 */ 808WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst) 809{ 810 OSSL_STATEM *st = &s->statem; 811 812 s->init_num = 0; 813 814 switch (st->hand_state) { 815 default: 816 /* No post work to be done */ 817 break; 818 819 case TLS_ST_SW_HELLO_REQ: 820 if (statem_flush(s) != 1) 821 return WORK_MORE_A; 822 if (!ssl3_init_finished_mac(s)) { 823 /* SSLfatal() already called */ 824 return WORK_ERROR; 825 } 826 break; 827 828 case DTLS_ST_SW_HELLO_VERIFY_REQUEST: 829 if (statem_flush(s) != 1) 830 return WORK_MORE_A; 831 /* HelloVerifyRequest resets Finished MAC */ 832 if (s->version != DTLS1_BAD_VER && !ssl3_init_finished_mac(s)) { 833 /* SSLfatal() already called */ 834 return WORK_ERROR; 835 } 836 /* 837 * The next message should be another ClientHello which we need to 838 * treat like it was the first packet 839 */ 840 s->first_packet = 1; 841 break; 842 843 case TLS_ST_SW_SRVR_HELLO: 844 if (SSL_IS_TLS13(s) && s->hello_retry_request == SSL_HRR_PENDING) { 845 if ((s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) == 0 846 && statem_flush(s) != 1) 847 return WORK_MORE_A; 848 break; 849 } 850#ifndef OPENSSL_NO_SCTP 851 if (SSL_IS_DTLS(s) && s->hit) { 852 unsigned char sctpauthkey[64]; 853 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; 854 size_t labellen; 855 856 /* 857 * Add new shared key for SCTP-Auth, will be ignored if no 858 * SCTP used. 859 */ 860 memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, 861 sizeof(DTLS1_SCTP_AUTH_LABEL)); 862 863 /* Don't include the terminating zero. */ 864 labellen = sizeof(labelbuffer) - 1; 865 if (s->mode & SSL_MODE_DTLS_SCTP_LABEL_LENGTH_BUG) 866 labellen += 1; 867 868 if (SSL_export_keying_material(s, sctpauthkey, 869 sizeof(sctpauthkey), labelbuffer, 870 labellen, NULL, 0, 871 0) <= 0) { 872 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 873 SSL_F_OSSL_STATEM_SERVER_POST_WORK, 874 ERR_R_INTERNAL_ERROR); 875 return WORK_ERROR; 876 } 877 878 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 879 sizeof(sctpauthkey), sctpauthkey); 880 } 881#endif 882 if (!SSL_IS_TLS13(s) 883 || ((s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) != 0 884 && s->hello_retry_request != SSL_HRR_COMPLETE)) 885 break; 886 /* Fall through */ 887 888 case TLS_ST_SW_CHANGE: 889 if (s->hello_retry_request == SSL_HRR_PENDING) { 890 if (!statem_flush(s)) 891 return WORK_MORE_A; 892 break; 893 } 894 895 if (SSL_IS_TLS13(s)) { 896 if (!s->method->ssl3_enc->setup_key_block(s) 897 || !s->method->ssl3_enc->change_cipher_state(s, 898 SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_SERVER_WRITE)) { 899 /* SSLfatal() already called */ 900 return WORK_ERROR; 901 } 902 903 if (s->ext.early_data != SSL_EARLY_DATA_ACCEPTED 904 && !s->method->ssl3_enc->change_cipher_state(s, 905 SSL3_CC_HANDSHAKE |SSL3_CHANGE_CIPHER_SERVER_READ)) { 906 /* SSLfatal() already called */ 907 return WORK_ERROR; 908 } 909 /* 910 * We don't yet know whether the next record we are going to receive 911 * is an unencrypted alert, an encrypted alert, or an encrypted 912 * handshake message. We temporarily tolerate unencrypted alerts. 913 */ 914 s->statem.enc_read_state = ENC_READ_STATE_ALLOW_PLAIN_ALERTS; 915 break; 916 } 917 918#ifndef OPENSSL_NO_SCTP 919 if (SSL_IS_DTLS(s) && !s->hit) { 920 /* 921 * Change to new shared key of SCTP-Auth, will be ignored if 922 * no SCTP used. 923 */ 924 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 925 0, NULL); 926 } 927#endif 928 if (!s->method->ssl3_enc->change_cipher_state(s, 929 SSL3_CHANGE_CIPHER_SERVER_WRITE)) 930 { 931 /* SSLfatal() already called */ 932 return WORK_ERROR; 933 } 934 935 if (SSL_IS_DTLS(s)) 936 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 937 break; 938 939 case TLS_ST_SW_SRVR_DONE: 940 if (statem_flush(s) != 1) 941 return WORK_MORE_A; 942 break; 943 944 case TLS_ST_SW_FINISHED: 945 if (statem_flush(s) != 1) 946 return WORK_MORE_A; 947#ifndef OPENSSL_NO_SCTP 948 if (SSL_IS_DTLS(s) && s->hit) { 949 /* 950 * Change to new shared key of SCTP-Auth, will be ignored if 951 * no SCTP used. 952 */ 953 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 954 0, NULL); 955 } 956#endif 957 if (SSL_IS_TLS13(s)) { 958 /* TLS 1.3 gets the secret size from the handshake md */ 959 size_t dummy; 960 if (!s->method->ssl3_enc->generate_master_secret(s, 961 s->master_secret, s->handshake_secret, 0, 962 &dummy) 963 || !s->method->ssl3_enc->change_cipher_state(s, 964 SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_SERVER_WRITE)) 965 /* SSLfatal() already called */ 966 return WORK_ERROR; 967 } 968 break; 969 970 case TLS_ST_SW_CERT_REQ: 971 if (s->post_handshake_auth == SSL_PHA_REQUEST_PENDING) { 972 if (statem_flush(s) != 1) 973 return WORK_MORE_A; 974 } 975 break; 976 977 case TLS_ST_SW_KEY_UPDATE: 978 if (statem_flush(s) != 1) 979 return WORK_MORE_A; 980 if (!tls13_update_key(s, 1)) { 981 /* SSLfatal() already called */ 982 return WORK_ERROR; 983 } 984 break; 985 986 case TLS_ST_SW_SESSION_TICKET: 987 clear_sys_error(); 988 if (SSL_IS_TLS13(s) && statem_flush(s) != 1) { 989 if (SSL_get_error(s, 0) == SSL_ERROR_SYSCALL 990 && conn_is_closed()) { 991 /* 992 * We ignore connection closed errors in TLSv1.3 when sending a 993 * NewSessionTicket and behave as if we were successful. This is 994 * so that we are still able to read data sent to us by a client 995 * that closes soon after the end of the handshake without 996 * waiting to read our post-handshake NewSessionTickets. 997 */ 998 s->rwstate = SSL_NOTHING; 999 break; 1000 } 1001 1002 return WORK_MORE_A; 1003 } 1004 break; 1005 } 1006 1007 return WORK_FINISHED_CONTINUE; 1008} 1009 1010/* 1011 * Get the message construction function and message type for sending from the 1012 * server 1013 * 1014 * Valid return values are: 1015 * 1: Success 1016 * 0: Error 1017 */ 1018int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt, 1019 confunc_f *confunc, int *mt) 1020{ 1021 OSSL_STATEM *st = &s->statem; 1022 1023 switch (st->hand_state) { 1024 default: 1025 /* Shouldn't happen */ 1026 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 1027 SSL_F_OSSL_STATEM_SERVER_CONSTRUCT_MESSAGE, 1028 SSL_R_BAD_HANDSHAKE_STATE); 1029 return 0; 1030 1031 case TLS_ST_SW_CHANGE: 1032 if (SSL_IS_DTLS(s)) 1033 *confunc = dtls_construct_change_cipher_spec; 1034 else 1035 *confunc = tls_construct_change_cipher_spec; 1036 *mt = SSL3_MT_CHANGE_CIPHER_SPEC; 1037 break; 1038 1039 case DTLS_ST_SW_HELLO_VERIFY_REQUEST: 1040 *confunc = dtls_construct_hello_verify_request; 1041 *mt = DTLS1_MT_HELLO_VERIFY_REQUEST; 1042 break; 1043 1044 case TLS_ST_SW_HELLO_REQ: 1045 /* No construction function needed */ 1046 *confunc = NULL; 1047 *mt = SSL3_MT_HELLO_REQUEST; 1048 break; 1049 1050 case TLS_ST_SW_SRVR_HELLO: 1051 *confunc = tls_construct_server_hello; 1052 *mt = SSL3_MT_SERVER_HELLO; 1053 break; 1054 1055 case TLS_ST_SW_CERT: 1056 *confunc = tls_construct_server_certificate; 1057 *mt = SSL3_MT_CERTIFICATE; 1058 break; 1059 1060 case TLS_ST_SW_CERT_VRFY: 1061 *confunc = tls_construct_cert_verify; 1062 *mt = SSL3_MT_CERTIFICATE_VERIFY; 1063 break; 1064 1065 1066 case TLS_ST_SW_KEY_EXCH: 1067 *confunc = tls_construct_server_key_exchange; 1068 *mt = SSL3_MT_SERVER_KEY_EXCHANGE; 1069 break; 1070 1071 case TLS_ST_SW_CERT_REQ: 1072 *confunc = tls_construct_certificate_request; 1073 *mt = SSL3_MT_CERTIFICATE_REQUEST; 1074 break; 1075 1076 case TLS_ST_SW_SRVR_DONE: 1077 *confunc = tls_construct_server_done; 1078 *mt = SSL3_MT_SERVER_DONE; 1079 break; 1080 1081 case TLS_ST_SW_SESSION_TICKET: 1082 *confunc = tls_construct_new_session_ticket; 1083 *mt = SSL3_MT_NEWSESSION_TICKET; 1084 break; 1085 1086 case TLS_ST_SW_CERT_STATUS: 1087 *confunc = tls_construct_cert_status; 1088 *mt = SSL3_MT_CERTIFICATE_STATUS; 1089 break; 1090 1091 case TLS_ST_SW_FINISHED: 1092 *confunc = tls_construct_finished; 1093 *mt = SSL3_MT_FINISHED; 1094 break; 1095 1096 case TLS_ST_EARLY_DATA: 1097 *confunc = NULL; 1098 *mt = SSL3_MT_DUMMY; 1099 break; 1100 1101 case TLS_ST_SW_ENCRYPTED_EXTENSIONS: 1102 *confunc = tls_construct_encrypted_extensions; 1103 *mt = SSL3_MT_ENCRYPTED_EXTENSIONS; 1104 break; 1105 1106 case TLS_ST_SW_KEY_UPDATE: 1107 *confunc = tls_construct_key_update; 1108 *mt = SSL3_MT_KEY_UPDATE; 1109 break; 1110 } 1111 1112 return 1; 1113} 1114 1115/* 1116 * Maximum size (excluding the Handshake header) of a ClientHello message, 1117 * calculated as follows: 1118 * 1119 * 2 + # client_version 1120 * 32 + # only valid length for random 1121 * 1 + # length of session_id 1122 * 32 + # maximum size for session_id 1123 * 2 + # length of cipher suites 1124 * 2^16-2 + # maximum length of cipher suites array 1125 * 1 + # length of compression_methods 1126 * 2^8-1 + # maximum length of compression methods 1127 * 2 + # length of extensions 1128 * 2^16-1 # maximum length of extensions 1129 */ 1130#define CLIENT_HELLO_MAX_LENGTH 131396 1131 1132#define CLIENT_KEY_EXCH_MAX_LENGTH 2048 1133#define NEXT_PROTO_MAX_LENGTH 514 1134 1135/* 1136 * Returns the maximum allowed length for the current message that we are 1137 * reading. Excludes the message header. 1138 */ 1139size_t ossl_statem_server_max_message_size(SSL *s) 1140{ 1141 OSSL_STATEM *st = &s->statem; 1142 1143 switch (st->hand_state) { 1144 default: 1145 /* Shouldn't happen */ 1146 return 0; 1147 1148 case TLS_ST_SR_CLNT_HELLO: 1149 return CLIENT_HELLO_MAX_LENGTH; 1150 1151 case TLS_ST_SR_END_OF_EARLY_DATA: 1152 return END_OF_EARLY_DATA_MAX_LENGTH; 1153 1154 case TLS_ST_SR_CERT: 1155 return s->max_cert_list; 1156 1157 case TLS_ST_SR_KEY_EXCH: 1158 return CLIENT_KEY_EXCH_MAX_LENGTH; 1159 1160 case TLS_ST_SR_CERT_VRFY: 1161 return SSL3_RT_MAX_PLAIN_LENGTH; 1162 1163#ifndef OPENSSL_NO_NEXTPROTONEG 1164 case TLS_ST_SR_NEXT_PROTO: 1165 return NEXT_PROTO_MAX_LENGTH; 1166#endif 1167 1168 case TLS_ST_SR_CHANGE: 1169 return CCS_MAX_LENGTH; 1170 1171 case TLS_ST_SR_FINISHED: 1172 return FINISHED_MAX_LENGTH; 1173 1174 case TLS_ST_SR_KEY_UPDATE: 1175 return KEY_UPDATE_MAX_LENGTH; 1176 } 1177} 1178 1179/* 1180 * Process a message that the server has received from the client. 1181 */ 1182MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt) 1183{ 1184 OSSL_STATEM *st = &s->statem; 1185 1186 switch (st->hand_state) { 1187 default: 1188 /* Shouldn't happen */ 1189 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 1190 SSL_F_OSSL_STATEM_SERVER_PROCESS_MESSAGE, 1191 ERR_R_INTERNAL_ERROR); 1192 return MSG_PROCESS_ERROR; 1193 1194 case TLS_ST_SR_CLNT_HELLO: 1195 return tls_process_client_hello(s, pkt); 1196 1197 case TLS_ST_SR_END_OF_EARLY_DATA: 1198 return tls_process_end_of_early_data(s, pkt); 1199 1200 case TLS_ST_SR_CERT: 1201 return tls_process_client_certificate(s, pkt); 1202 1203 case TLS_ST_SR_KEY_EXCH: 1204 return tls_process_client_key_exchange(s, pkt); 1205 1206 case TLS_ST_SR_CERT_VRFY: 1207 return tls_process_cert_verify(s, pkt); 1208 1209#ifndef OPENSSL_NO_NEXTPROTONEG 1210 case TLS_ST_SR_NEXT_PROTO: 1211 return tls_process_next_proto(s, pkt); 1212#endif 1213 1214 case TLS_ST_SR_CHANGE: 1215 return tls_process_change_cipher_spec(s, pkt); 1216 1217 case TLS_ST_SR_FINISHED: 1218 return tls_process_finished(s, pkt); 1219 1220 case TLS_ST_SR_KEY_UPDATE: 1221 return tls_process_key_update(s, pkt); 1222 1223 } 1224} 1225 1226/* 1227 * Perform any further processing required following the receipt of a message 1228 * from the client 1229 */ 1230WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst) 1231{ 1232 OSSL_STATEM *st = &s->statem; 1233 1234 switch (st->hand_state) { 1235 default: 1236 /* Shouldn't happen */ 1237 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 1238 SSL_F_OSSL_STATEM_SERVER_POST_PROCESS_MESSAGE, 1239 ERR_R_INTERNAL_ERROR); 1240 return WORK_ERROR; 1241 1242 case TLS_ST_SR_CLNT_HELLO: 1243 return tls_post_process_client_hello(s, wst); 1244 1245 case TLS_ST_SR_KEY_EXCH: 1246 return tls_post_process_client_key_exchange(s, wst); 1247 } 1248} 1249 1250#ifndef OPENSSL_NO_SRP 1251/* Returns 1 on success, 0 for retryable error, -1 for fatal error */ 1252static int ssl_check_srp_ext_ClientHello(SSL *s) 1253{ 1254 int ret; 1255 int al = SSL_AD_UNRECOGNIZED_NAME; 1256 1257 if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) && 1258 (s->srp_ctx.TLS_ext_srp_username_callback != NULL)) { 1259 if (s->srp_ctx.login == NULL) { 1260 /* 1261 * RFC 5054 says SHOULD reject, we do so if There is no srp 1262 * login name 1263 */ 1264 SSLfatal(s, SSL_AD_UNKNOWN_PSK_IDENTITY, 1265 SSL_F_SSL_CHECK_SRP_EXT_CLIENTHELLO, 1266 SSL_R_PSK_IDENTITY_NOT_FOUND); 1267 return -1; 1268 } else { 1269 ret = SSL_srp_server_param_with_username(s, &al); 1270 if (ret < 0) 1271 return 0; 1272 if (ret == SSL3_AL_FATAL) { 1273 SSLfatal(s, al, SSL_F_SSL_CHECK_SRP_EXT_CLIENTHELLO, 1274 al == SSL_AD_UNKNOWN_PSK_IDENTITY 1275 ? SSL_R_PSK_IDENTITY_NOT_FOUND 1276 : SSL_R_CLIENTHELLO_TLSEXT); 1277 return -1; 1278 } 1279 } 1280 } 1281 return 1; 1282} 1283#endif 1284 1285int dtls_raw_hello_verify_request(WPACKET *pkt, unsigned char *cookie, 1286 size_t cookie_len) 1287{ 1288 /* Always use DTLS 1.0 version: see RFC 6347 */ 1289 if (!WPACKET_put_bytes_u16(pkt, DTLS1_VERSION) 1290 || !WPACKET_sub_memcpy_u8(pkt, cookie, cookie_len)) 1291 return 0; 1292 1293 return 1; 1294} 1295 1296int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt) 1297{ 1298 unsigned int cookie_leni; 1299 if (s->ctx->app_gen_cookie_cb == NULL || 1300 s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 1301 &cookie_leni) == 0 || 1302 cookie_leni > 255) { 1303 SSLfatal(s, SSL_AD_NO_ALERT, SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST, 1304 SSL_R_COOKIE_GEN_CALLBACK_FAILURE); 1305 return 0; 1306 } 1307 s->d1->cookie_len = cookie_leni; 1308 1309 if (!dtls_raw_hello_verify_request(pkt, s->d1->cookie, 1310 s->d1->cookie_len)) { 1311 SSLfatal(s, SSL_AD_NO_ALERT, SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST, 1312 ERR_R_INTERNAL_ERROR); 1313 return 0; 1314 } 1315 1316 return 1; 1317} 1318 1319#ifndef OPENSSL_NO_EC 1320/*- 1321 * ssl_check_for_safari attempts to fingerprint Safari using OS X 1322 * SecureTransport using the TLS extension block in |hello|. 1323 * Safari, since 10.6, sends exactly these extensions, in this order: 1324 * SNI, 1325 * elliptic_curves 1326 * ec_point_formats 1327 * signature_algorithms (for TLSv1.2 only) 1328 * 1329 * We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8, 1330 * but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them. 1331 * Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from 1332 * 10.8..10.8.3 (which don't work). 1333 */ 1334static void ssl_check_for_safari(SSL *s, const CLIENTHELLO_MSG *hello) 1335{ 1336 static const unsigned char kSafariExtensionsBlock[] = { 1337 0x00, 0x0a, /* elliptic_curves extension */ 1338 0x00, 0x08, /* 8 bytes */ 1339 0x00, 0x06, /* 6 bytes of curve ids */ 1340 0x00, 0x17, /* P-256 */ 1341 0x00, 0x18, /* P-384 */ 1342 0x00, 0x19, /* P-521 */ 1343 1344 0x00, 0x0b, /* ec_point_formats */ 1345 0x00, 0x02, /* 2 bytes */ 1346 0x01, /* 1 point format */ 1347 0x00, /* uncompressed */ 1348 /* The following is only present in TLS 1.2 */ 1349 0x00, 0x0d, /* signature_algorithms */ 1350 0x00, 0x0c, /* 12 bytes */ 1351 0x00, 0x0a, /* 10 bytes */ 1352 0x05, 0x01, /* SHA-384/RSA */ 1353 0x04, 0x01, /* SHA-256/RSA */ 1354 0x02, 0x01, /* SHA-1/RSA */ 1355 0x04, 0x03, /* SHA-256/ECDSA */ 1356 0x02, 0x03, /* SHA-1/ECDSA */ 1357 }; 1358 /* Length of the common prefix (first two extensions). */ 1359 static const size_t kSafariCommonExtensionsLength = 18; 1360 unsigned int type; 1361 PACKET sni, tmppkt; 1362 size_t ext_len; 1363 1364 tmppkt = hello->extensions; 1365 1366 if (!PACKET_forward(&tmppkt, 2) 1367 || !PACKET_get_net_2(&tmppkt, &type) 1368 || !PACKET_get_length_prefixed_2(&tmppkt, &sni)) { 1369 return; 1370 } 1371 1372 if (type != TLSEXT_TYPE_server_name) 1373 return; 1374 1375 ext_len = TLS1_get_client_version(s) >= TLS1_2_VERSION ? 1376 sizeof(kSafariExtensionsBlock) : kSafariCommonExtensionsLength; 1377 1378 s->s3->is_probably_safari = PACKET_equal(&tmppkt, kSafariExtensionsBlock, 1379 ext_len); 1380} 1381#endif /* !OPENSSL_NO_EC */ 1382 1383MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt) 1384{ 1385 /* |cookie| will only be initialized for DTLS. */ 1386 PACKET session_id, compression, extensions, cookie; 1387 static const unsigned char null_compression = 0; 1388 CLIENTHELLO_MSG *clienthello = NULL; 1389 1390 /* Check if this is actually an unexpected renegotiation ClientHello */ 1391 if (s->renegotiate == 0 && !SSL_IS_FIRST_HANDSHAKE(s)) { 1392 if (!ossl_assert(!SSL_IS_TLS13(s))) { 1393 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO, 1394 ERR_R_INTERNAL_ERROR); 1395 goto err; 1396 } 1397 if ((s->options & SSL_OP_NO_RENEGOTIATION) != 0 1398 || (!s->s3->send_connection_binding 1399 && (s->options 1400 & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) == 0)) { 1401 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_RENEGOTIATION); 1402 return MSG_PROCESS_FINISHED_READING; 1403 } 1404 s->renegotiate = 1; 1405 s->new_session = 1; 1406 } 1407 1408 clienthello = OPENSSL_zalloc(sizeof(*clienthello)); 1409 if (clienthello == NULL) { 1410 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO, 1411 ERR_R_INTERNAL_ERROR); 1412 goto err; 1413 } 1414 1415 /* 1416 * First, parse the raw ClientHello data into the CLIENTHELLO_MSG structure. 1417 */ 1418 clienthello->isv2 = RECORD_LAYER_is_sslv2_record(&s->rlayer); 1419 PACKET_null_init(&cookie); 1420 1421 if (clienthello->isv2) { 1422 unsigned int mt; 1423 1424 if (!SSL_IS_FIRST_HANDSHAKE(s) 1425 || s->hello_retry_request != SSL_HRR_NONE) { 1426 SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, 1427 SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNEXPECTED_MESSAGE); 1428 goto err; 1429 } 1430 1431 /*- 1432 * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2 1433 * header is sent directly on the wire, not wrapped as a TLS 1434 * record. Our record layer just processes the message length and passes 1435 * the rest right through. Its format is: 1436 * Byte Content 1437 * 0-1 msg_length - decoded by the record layer 1438 * 2 msg_type - s->init_msg points here 1439 * 3-4 version 1440 * 5-6 cipher_spec_length 1441 * 7-8 session_id_length 1442 * 9-10 challenge_length 1443 * ... ... 1444 */ 1445 1446 if (!PACKET_get_1(pkt, &mt) 1447 || mt != SSL2_MT_CLIENT_HELLO) { 1448 /* 1449 * Should never happen. We should have tested this in the record 1450 * layer in order to have determined that this is a SSLv2 record 1451 * in the first place 1452 */ 1453 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO, 1454 ERR_R_INTERNAL_ERROR); 1455 goto err; 1456 } 1457 } 1458 1459 if (!PACKET_get_net_2(pkt, &clienthello->legacy_version)) { 1460 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO, 1461 SSL_R_LENGTH_TOO_SHORT); 1462 goto err; 1463 } 1464 1465 /* Parse the message and load client random. */ 1466 if (clienthello->isv2) { 1467 /* 1468 * Handle an SSLv2 backwards compatible ClientHello 1469 * Note, this is only for SSLv3+ using the backward compatible format. 1470 * Real SSLv2 is not supported, and is rejected below. 1471 */ 1472 unsigned int ciphersuite_len, session_id_len, challenge_len; 1473 PACKET challenge; 1474 1475 if (!PACKET_get_net_2(pkt, &ciphersuite_len) 1476 || !PACKET_get_net_2(pkt, &session_id_len) 1477 || !PACKET_get_net_2(pkt, &challenge_len)) { 1478 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO, 1479 SSL_R_RECORD_LENGTH_MISMATCH); 1480 goto err; 1481 } 1482 1483 if (session_id_len > SSL_MAX_SSL_SESSION_ID_LENGTH) { 1484 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, 1485 SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); 1486 goto err; 1487 } 1488 1489 if (!PACKET_get_sub_packet(pkt, &clienthello->ciphersuites, 1490 ciphersuite_len) 1491 || !PACKET_copy_bytes(pkt, clienthello->session_id, session_id_len) 1492 || !PACKET_get_sub_packet(pkt, &challenge, challenge_len) 1493 /* No extensions. */ 1494 || PACKET_remaining(pkt) != 0) { 1495 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO, 1496 SSL_R_RECORD_LENGTH_MISMATCH); 1497 goto err; 1498 } 1499 clienthello->session_id_len = session_id_len; 1500 1501 /* Load the client random and compression list. We use SSL3_RANDOM_SIZE 1502 * here rather than sizeof(clienthello->random) because that is the limit 1503 * for SSLv3 and it is fixed. It won't change even if 1504 * sizeof(clienthello->random) does. 1505 */ 1506 challenge_len = challenge_len > SSL3_RANDOM_SIZE 1507 ? SSL3_RANDOM_SIZE : challenge_len; 1508 memset(clienthello->random, 0, SSL3_RANDOM_SIZE); 1509 if (!PACKET_copy_bytes(&challenge, 1510 clienthello->random + SSL3_RANDOM_SIZE - 1511 challenge_len, challenge_len) 1512 /* Advertise only null compression. */ 1513 || !PACKET_buf_init(&compression, &null_compression, 1)) { 1514 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO, 1515 ERR_R_INTERNAL_ERROR); 1516 goto err; 1517 } 1518 1519 PACKET_null_init(&clienthello->extensions); 1520 } else { 1521 /* Regular ClientHello. */ 1522 if (!PACKET_copy_bytes(pkt, clienthello->random, SSL3_RANDOM_SIZE) 1523 || !PACKET_get_length_prefixed_1(pkt, &session_id) 1524 || !PACKET_copy_all(&session_id, clienthello->session_id, 1525 SSL_MAX_SSL_SESSION_ID_LENGTH, 1526 &clienthello->session_id_len)) { 1527 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO, 1528 SSL_R_LENGTH_MISMATCH); 1529 goto err; 1530 } 1531 1532 if (SSL_IS_DTLS(s)) { 1533 if (!PACKET_get_length_prefixed_1(pkt, &cookie)) { 1534 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO, 1535 SSL_R_LENGTH_MISMATCH); 1536 goto err; 1537 } 1538 if (!PACKET_copy_all(&cookie, clienthello->dtls_cookie, 1539 DTLS1_COOKIE_LENGTH, 1540 &clienthello->dtls_cookie_len)) { 1541 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 1542 SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 1543 goto err; 1544 } 1545 /* 1546 * If we require cookies and this ClientHello doesn't contain one, 1547 * just return since we do not want to allocate any memory yet. 1548 * So check cookie length... 1549 */ 1550 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { 1551 if (clienthello->dtls_cookie_len == 0) { 1552 OPENSSL_free(clienthello); 1553 return MSG_PROCESS_FINISHED_READING; 1554 } 1555 } 1556 } 1557 1558 if (!PACKET_get_length_prefixed_2(pkt, &clienthello->ciphersuites)) { 1559 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO, 1560 SSL_R_LENGTH_MISMATCH); 1561 goto err; 1562 } 1563 1564 if (!PACKET_get_length_prefixed_1(pkt, &compression)) { 1565 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO, 1566 SSL_R_LENGTH_MISMATCH); 1567 goto err; 1568 } 1569 1570 /* Could be empty. */ 1571 if (PACKET_remaining(pkt) == 0) { 1572 PACKET_null_init(&clienthello->extensions); 1573 } else { 1574 if (!PACKET_get_length_prefixed_2(pkt, &clienthello->extensions) 1575 || PACKET_remaining(pkt) != 0) { 1576 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO, 1577 SSL_R_LENGTH_MISMATCH); 1578 goto err; 1579 } 1580 } 1581 } 1582 1583 if (!PACKET_copy_all(&compression, clienthello->compressions, 1584 MAX_COMPRESSIONS_SIZE, 1585 &clienthello->compressions_len)) { 1586 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CLIENT_HELLO, 1587 ERR_R_INTERNAL_ERROR); 1588 goto err; 1589 } 1590 1591 /* Preserve the raw extensions PACKET for later use */ 1592 extensions = clienthello->extensions; 1593 if (!tls_collect_extensions(s, &extensions, SSL_EXT_CLIENT_HELLO, 1594 &clienthello->pre_proc_exts, 1595 &clienthello->pre_proc_exts_len, 1)) { 1596 /* SSLfatal already been called */ 1597 goto err; 1598 } 1599 s->clienthello = clienthello; 1600 1601 return MSG_PROCESS_CONTINUE_PROCESSING; 1602 1603 err: 1604 if (clienthello != NULL) 1605 OPENSSL_free(clienthello->pre_proc_exts); 1606 OPENSSL_free(clienthello); 1607 1608 return MSG_PROCESS_ERROR; 1609} 1610 1611static int tls_early_post_process_client_hello(SSL *s) 1612{ 1613 unsigned int j; 1614 int i, al = SSL_AD_INTERNAL_ERROR; 1615 int protverr; 1616 size_t loop; 1617 unsigned long id; 1618#ifndef OPENSSL_NO_COMP 1619 SSL_COMP *comp = NULL; 1620#endif 1621 const SSL_CIPHER *c; 1622 STACK_OF(SSL_CIPHER) *ciphers = NULL; 1623 STACK_OF(SSL_CIPHER) *scsvs = NULL; 1624 CLIENTHELLO_MSG *clienthello = s->clienthello; 1625 DOWNGRADE dgrd = DOWNGRADE_NONE; 1626 1627 /* Finished parsing the ClientHello, now we can start processing it */ 1628 /* Give the ClientHello callback a crack at things */ 1629 if (s->ctx->client_hello_cb != NULL) { 1630 /* A failure in the ClientHello callback terminates the connection. */ 1631 switch (s->ctx->client_hello_cb(s, &al, s->ctx->client_hello_cb_arg)) { 1632 case SSL_CLIENT_HELLO_SUCCESS: 1633 break; 1634 case SSL_CLIENT_HELLO_RETRY: 1635 s->rwstate = SSL_CLIENT_HELLO_CB; 1636 return -1; 1637 case SSL_CLIENT_HELLO_ERROR: 1638 default: 1639 SSLfatal(s, al, 1640 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 1641 SSL_R_CALLBACK_FAILED); 1642 goto err; 1643 } 1644 } 1645 1646 /* Set up the client_random */ 1647 memcpy(s->s3->client_random, clienthello->random, SSL3_RANDOM_SIZE); 1648 1649 /* Choose the version */ 1650 1651 if (clienthello->isv2) { 1652 if (clienthello->legacy_version == SSL2_VERSION 1653 || (clienthello->legacy_version & 0xff00) 1654 != (SSL3_VERSION_MAJOR << 8)) { 1655 /* 1656 * This is real SSLv2 or something completely unknown. We don't 1657 * support it. 1658 */ 1659 SSLfatal(s, SSL_AD_PROTOCOL_VERSION, 1660 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 1661 SSL_R_UNKNOWN_PROTOCOL); 1662 goto err; 1663 } 1664 /* SSLv3/TLS */ 1665 s->client_version = clienthello->legacy_version; 1666 } 1667 /* 1668 * Do SSL/TLS version negotiation if applicable. For DTLS we just check 1669 * versions are potentially compatible. Version negotiation comes later. 1670 */ 1671 if (!SSL_IS_DTLS(s)) { 1672 protverr = ssl_choose_server_version(s, clienthello, &dgrd); 1673 } else if (s->method->version != DTLS_ANY_VERSION && 1674 DTLS_VERSION_LT((int)clienthello->legacy_version, s->version)) { 1675 protverr = SSL_R_VERSION_TOO_LOW; 1676 } else { 1677 protverr = 0; 1678 } 1679 1680 if (protverr) { 1681 if (SSL_IS_FIRST_HANDSHAKE(s)) { 1682 /* like ssl3_get_record, send alert using remote version number */ 1683 s->version = s->client_version = clienthello->legacy_version; 1684 } 1685 SSLfatal(s, SSL_AD_PROTOCOL_VERSION, 1686 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, protverr); 1687 goto err; 1688 } 1689 1690 /* TLSv1.3 specifies that a ClientHello must end on a record boundary */ 1691 if (SSL_IS_TLS13(s) && RECORD_LAYER_processed_read_pending(&s->rlayer)) { 1692 SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, 1693 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 1694 SSL_R_NOT_ON_RECORD_BOUNDARY); 1695 goto err; 1696 } 1697 1698 if (SSL_IS_DTLS(s)) { 1699 /* Empty cookie was already handled above by returning early. */ 1700 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { 1701 if (s->ctx->app_verify_cookie_cb != NULL) { 1702 if (s->ctx->app_verify_cookie_cb(s, clienthello->dtls_cookie, 1703 clienthello->dtls_cookie_len) == 0) { 1704 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 1705 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 1706 SSL_R_COOKIE_MISMATCH); 1707 goto err; 1708 /* else cookie verification succeeded */ 1709 } 1710 /* default verification */ 1711 } else if (s->d1->cookie_len != clienthello->dtls_cookie_len 1712 || memcmp(clienthello->dtls_cookie, s->d1->cookie, 1713 s->d1->cookie_len) != 0) { 1714 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 1715 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 1716 SSL_R_COOKIE_MISMATCH); 1717 goto err; 1718 } 1719 s->d1->cookie_verified = 1; 1720 } 1721 if (s->method->version == DTLS_ANY_VERSION) { 1722 protverr = ssl_choose_server_version(s, clienthello, &dgrd); 1723 if (protverr != 0) { 1724 s->version = s->client_version; 1725 SSLfatal(s, SSL_AD_PROTOCOL_VERSION, 1726 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, protverr); 1727 goto err; 1728 } 1729 } 1730 } 1731 1732 s->hit = 0; 1733 1734 if (!ssl_cache_cipherlist(s, &clienthello->ciphersuites, 1735 clienthello->isv2) || 1736 !bytes_to_cipher_list(s, &clienthello->ciphersuites, &ciphers, &scsvs, 1737 clienthello->isv2, 1)) { 1738 /* SSLfatal() already called */ 1739 goto err; 1740 } 1741 1742 s->s3->send_connection_binding = 0; 1743 /* Check what signalling cipher-suite values were received. */ 1744 if (scsvs != NULL) { 1745 for(i = 0; i < sk_SSL_CIPHER_num(scsvs); i++) { 1746 c = sk_SSL_CIPHER_value(scsvs, i); 1747 if (SSL_CIPHER_get_id(c) == SSL3_CK_SCSV) { 1748 if (s->renegotiate) { 1749 /* SCSV is fatal if renegotiating */ 1750 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 1751 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 1752 SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING); 1753 goto err; 1754 } 1755 s->s3->send_connection_binding = 1; 1756 } else if (SSL_CIPHER_get_id(c) == SSL3_CK_FALLBACK_SCSV && 1757 !ssl_check_version_downgrade(s)) { 1758 /* 1759 * This SCSV indicates that the client previously tried 1760 * a higher version. We should fail if the current version 1761 * is an unexpected downgrade, as that indicates that the first 1762 * connection may have been tampered with in order to trigger 1763 * an insecure downgrade. 1764 */ 1765 SSLfatal(s, SSL_AD_INAPPROPRIATE_FALLBACK, 1766 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 1767 SSL_R_INAPPROPRIATE_FALLBACK); 1768 goto err; 1769 } 1770 } 1771 } 1772 1773 /* For TLSv1.3 we must select the ciphersuite *before* session resumption */ 1774 if (SSL_IS_TLS13(s)) { 1775 const SSL_CIPHER *cipher = 1776 ssl3_choose_cipher(s, ciphers, SSL_get_ciphers(s)); 1777 1778 if (cipher == NULL) { 1779 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 1780 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 1781 SSL_R_NO_SHARED_CIPHER); 1782 goto err; 1783 } 1784 if (s->hello_retry_request == SSL_HRR_PENDING 1785 && (s->s3->tmp.new_cipher == NULL 1786 || s->s3->tmp.new_cipher->id != cipher->id)) { 1787 /* 1788 * A previous HRR picked a different ciphersuite to the one we 1789 * just selected. Something must have changed. 1790 */ 1791 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, 1792 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 1793 SSL_R_BAD_CIPHER); 1794 goto err; 1795 } 1796 s->s3->tmp.new_cipher = cipher; 1797 } 1798 1799 /* We need to do this before getting the session */ 1800 if (!tls_parse_extension(s, TLSEXT_IDX_extended_master_secret, 1801 SSL_EXT_CLIENT_HELLO, 1802 clienthello->pre_proc_exts, NULL, 0)) { 1803 /* SSLfatal() already called */ 1804 goto err; 1805 } 1806 1807 /* 1808 * We don't allow resumption in a backwards compatible ClientHello. 1809 * TODO(openssl-team): in TLS1.1+, session_id MUST be empty. 1810 * 1811 * Versions before 0.9.7 always allow clients to resume sessions in 1812 * renegotiation. 0.9.7 and later allow this by default, but optionally 1813 * ignore resumption requests with flag 1814 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather 1815 * than a change to default behavior so that applications relying on 1816 * this for security won't even compile against older library versions). 1817 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to 1818 * request renegotiation but not a new session (s->new_session remains 1819 * unset): for servers, this essentially just means that the 1820 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be 1821 * ignored. 1822 */ 1823 if (clienthello->isv2 || 1824 (s->new_session && 1825 (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { 1826 if (!ssl_get_new_session(s, 1)) { 1827 /* SSLfatal() already called */ 1828 goto err; 1829 } 1830 } else { 1831 i = ssl_get_prev_session(s, clienthello); 1832 if (i == 1) { 1833 /* previous session */ 1834 s->hit = 1; 1835 } else if (i == -1) { 1836 /* SSLfatal() already called */ 1837 goto err; 1838 } else { 1839 /* i == 0 */ 1840 if (!ssl_get_new_session(s, 1)) { 1841 /* SSLfatal() already called */ 1842 goto err; 1843 } 1844 } 1845 } 1846 1847 if (SSL_IS_TLS13(s)) { 1848 memcpy(s->tmp_session_id, s->clienthello->session_id, 1849 s->clienthello->session_id_len); 1850 s->tmp_session_id_len = s->clienthello->session_id_len; 1851 } 1852 1853 /* 1854 * If it is a hit, check that the cipher is in the list. In TLSv1.3 we check 1855 * ciphersuite compatibility with the session as part of resumption. 1856 */ 1857 if (!SSL_IS_TLS13(s) && s->hit) { 1858 j = 0; 1859 id = s->session->cipher->id; 1860 1861#ifdef CIPHER_DEBUG 1862 fprintf(stderr, "client sent %d ciphers\n", sk_SSL_CIPHER_num(ciphers)); 1863#endif 1864 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { 1865 c = sk_SSL_CIPHER_value(ciphers, i); 1866#ifdef CIPHER_DEBUG 1867 fprintf(stderr, "client [%2d of %2d]:%s\n", 1868 i, sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c)); 1869#endif 1870 if (c->id == id) { 1871 j = 1; 1872 break; 1873 } 1874 } 1875 if (j == 0) { 1876 /* 1877 * we need to have the cipher in the cipher list if we are asked 1878 * to reuse it 1879 */ 1880 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, 1881 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 1882 SSL_R_REQUIRED_CIPHER_MISSING); 1883 goto err; 1884 } 1885 } 1886 1887 for (loop = 0; loop < clienthello->compressions_len; loop++) { 1888 if (clienthello->compressions[loop] == 0) 1889 break; 1890 } 1891 1892 if (loop >= clienthello->compressions_len) { 1893 /* no compress */ 1894 SSLfatal(s, SSL_AD_DECODE_ERROR, 1895 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 1896 SSL_R_NO_COMPRESSION_SPECIFIED); 1897 goto err; 1898 } 1899 1900#ifndef OPENSSL_NO_EC 1901 if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG) 1902 ssl_check_for_safari(s, clienthello); 1903#endif /* !OPENSSL_NO_EC */ 1904 1905 /* TLS extensions */ 1906 if (!tls_parse_all_extensions(s, SSL_EXT_CLIENT_HELLO, 1907 clienthello->pre_proc_exts, NULL, 0, 1)) { 1908 /* SSLfatal() already called */ 1909 goto err; 1910 } 1911 1912 /* 1913 * Check if we want to use external pre-shared secret for this handshake 1914 * for not reused session only. We need to generate server_random before 1915 * calling tls_session_secret_cb in order to allow SessionTicket 1916 * processing to use it in key derivation. 1917 */ 1918 { 1919 unsigned char *pos; 1920 pos = s->s3->server_random; 1921 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE, dgrd) <= 0) { 1922 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 1923 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 1924 ERR_R_INTERNAL_ERROR); 1925 goto err; 1926 } 1927 } 1928 1929 if (!s->hit 1930 && s->version >= TLS1_VERSION 1931 && !SSL_IS_TLS13(s) 1932 && !SSL_IS_DTLS(s) 1933 && s->ext.session_secret_cb) { 1934 const SSL_CIPHER *pref_cipher = NULL; 1935 /* 1936 * s->session->master_key_length is a size_t, but this is an int for 1937 * backwards compat reasons 1938 */ 1939 int master_key_length; 1940 1941 master_key_length = sizeof(s->session->master_key); 1942 if (s->ext.session_secret_cb(s, s->session->master_key, 1943 &master_key_length, ciphers, 1944 &pref_cipher, 1945 s->ext.session_secret_cb_arg) 1946 && master_key_length > 0) { 1947 s->session->master_key_length = master_key_length; 1948 s->hit = 1; 1949 s->peer_ciphers = ciphers; 1950 s->session->verify_result = X509_V_OK; 1951 1952 ciphers = NULL; 1953 1954 /* check if some cipher was preferred by call back */ 1955 if (pref_cipher == NULL) 1956 pref_cipher = ssl3_choose_cipher(s, s->peer_ciphers, 1957 SSL_get_ciphers(s)); 1958 if (pref_cipher == NULL) { 1959 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 1960 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 1961 SSL_R_NO_SHARED_CIPHER); 1962 goto err; 1963 } 1964 1965 s->session->cipher = pref_cipher; 1966 sk_SSL_CIPHER_free(s->cipher_list); 1967 s->cipher_list = sk_SSL_CIPHER_dup(s->peer_ciphers); 1968 sk_SSL_CIPHER_free(s->cipher_list_by_id); 1969 s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->peer_ciphers); 1970 } 1971 } 1972 1973 /* 1974 * Worst case, we will use the NULL compression, but if we have other 1975 * options, we will now look for them. We have complen-1 compression 1976 * algorithms from the client, starting at q. 1977 */ 1978 s->s3->tmp.new_compression = NULL; 1979 if (SSL_IS_TLS13(s)) { 1980 /* 1981 * We already checked above that the NULL compression method appears in 1982 * the list. Now we check there aren't any others (which is illegal in 1983 * a TLSv1.3 ClientHello. 1984 */ 1985 if (clienthello->compressions_len != 1) { 1986 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, 1987 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 1988 SSL_R_INVALID_COMPRESSION_ALGORITHM); 1989 goto err; 1990 } 1991 } 1992#ifndef OPENSSL_NO_COMP 1993 /* This only happens if we have a cache hit */ 1994 else if (s->session->compress_meth != 0) { 1995 int m, comp_id = s->session->compress_meth; 1996 unsigned int k; 1997 /* Perform sanity checks on resumed compression algorithm */ 1998 /* Can't disable compression */ 1999 if (!ssl_allow_compression(s)) { 2000 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 2001 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 2002 SSL_R_INCONSISTENT_COMPRESSION); 2003 goto err; 2004 } 2005 /* Look for resumed compression method */ 2006 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) { 2007 comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); 2008 if (comp_id == comp->id) { 2009 s->s3->tmp.new_compression = comp; 2010 break; 2011 } 2012 } 2013 if (s->s3->tmp.new_compression == NULL) { 2014 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 2015 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 2016 SSL_R_INVALID_COMPRESSION_ALGORITHM); 2017 goto err; 2018 } 2019 /* Look for resumed method in compression list */ 2020 for (k = 0; k < clienthello->compressions_len; k++) { 2021 if (clienthello->compressions[k] == comp_id) 2022 break; 2023 } 2024 if (k >= clienthello->compressions_len) { 2025 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, 2026 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 2027 SSL_R_REQUIRED_COMPRESSION_ALGORITHM_MISSING); 2028 goto err; 2029 } 2030 } else if (s->hit) { 2031 comp = NULL; 2032 } else if (ssl_allow_compression(s) && s->ctx->comp_methods) { 2033 /* See if we have a match */ 2034 int m, nn, v, done = 0; 2035 unsigned int o; 2036 2037 nn = sk_SSL_COMP_num(s->ctx->comp_methods); 2038 for (m = 0; m < nn; m++) { 2039 comp = sk_SSL_COMP_value(s->ctx->comp_methods, m); 2040 v = comp->id; 2041 for (o = 0; o < clienthello->compressions_len; o++) { 2042 if (v == clienthello->compressions[o]) { 2043 done = 1; 2044 break; 2045 } 2046 } 2047 if (done) 2048 break; 2049 } 2050 if (done) 2051 s->s3->tmp.new_compression = comp; 2052 else 2053 comp = NULL; 2054 } 2055#else 2056 /* 2057 * If compression is disabled we'd better not try to resume a session 2058 * using compression. 2059 */ 2060 if (s->session->compress_meth != 0) { 2061 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 2062 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 2063 SSL_R_INCONSISTENT_COMPRESSION); 2064 goto err; 2065 } 2066#endif 2067 2068 /* 2069 * Given s->peer_ciphers and SSL_get_ciphers, we must pick a cipher 2070 */ 2071 2072 if (!s->hit || SSL_IS_TLS13(s)) { 2073 sk_SSL_CIPHER_free(s->peer_ciphers); 2074 s->peer_ciphers = ciphers; 2075 if (ciphers == NULL) { 2076 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2077 SSL_F_TLS_EARLY_POST_PROCESS_CLIENT_HELLO, 2078 ERR_R_INTERNAL_ERROR); 2079 goto err; 2080 } 2081 ciphers = NULL; 2082 } 2083 2084 if (!s->hit) { 2085#ifdef OPENSSL_NO_COMP 2086 s->session->compress_meth = 0; 2087#else 2088 s->session->compress_meth = (comp == NULL) ? 0 : comp->id; 2089#endif 2090 if (!tls1_set_server_sigalgs(s)) { 2091 /* SSLfatal() already called */ 2092 goto err; 2093 } 2094 } 2095 2096 sk_SSL_CIPHER_free(ciphers); 2097 sk_SSL_CIPHER_free(scsvs); 2098 OPENSSL_free(clienthello->pre_proc_exts); 2099 OPENSSL_free(s->clienthello); 2100 s->clienthello = NULL; 2101 return 1; 2102 err: 2103 sk_SSL_CIPHER_free(ciphers); 2104 sk_SSL_CIPHER_free(scsvs); 2105 OPENSSL_free(clienthello->pre_proc_exts); 2106 OPENSSL_free(s->clienthello); 2107 s->clienthello = NULL; 2108 2109 return 0; 2110} 2111 2112/* 2113 * Call the status request callback if needed. Upon success, returns 1. 2114 * Upon failure, returns 0. 2115 */ 2116static int tls_handle_status_request(SSL *s) 2117{ 2118 s->ext.status_expected = 0; 2119 2120 /* 2121 * If status request then ask callback what to do. Note: this must be 2122 * called after servername callbacks in case the certificate has changed, 2123 * and must be called after the cipher has been chosen because this may 2124 * influence which certificate is sent 2125 */ 2126 if (s->ext.status_type != TLSEXT_STATUSTYPE_nothing && s->ctx != NULL 2127 && s->ctx->ext.status_cb != NULL) { 2128 int ret; 2129 2130 /* If no certificate can't return certificate status */ 2131 if (s->s3->tmp.cert != NULL) { 2132 /* 2133 * Set current certificate to one we will use so SSL_get_certificate 2134 * et al can pick it up. 2135 */ 2136 s->cert->key = s->s3->tmp.cert; 2137 ret = s->ctx->ext.status_cb(s, s->ctx->ext.status_arg); 2138 switch (ret) { 2139 /* We don't want to send a status request response */ 2140 case SSL_TLSEXT_ERR_NOACK: 2141 s->ext.status_expected = 0; 2142 break; 2143 /* status request response should be sent */ 2144 case SSL_TLSEXT_ERR_OK: 2145 if (s->ext.ocsp.resp) 2146 s->ext.status_expected = 1; 2147 break; 2148 /* something bad happened */ 2149 case SSL_TLSEXT_ERR_ALERT_FATAL: 2150 default: 2151 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2152 SSL_F_TLS_HANDLE_STATUS_REQUEST, 2153 SSL_R_CLIENTHELLO_TLSEXT); 2154 return 0; 2155 } 2156 } 2157 } 2158 2159 return 1; 2160} 2161 2162/* 2163 * Call the alpn_select callback if needed. Upon success, returns 1. 2164 * Upon failure, returns 0. 2165 */ 2166int tls_handle_alpn(SSL *s) 2167{ 2168 const unsigned char *selected = NULL; 2169 unsigned char selected_len = 0; 2170 2171 if (s->ctx->ext.alpn_select_cb != NULL && s->s3->alpn_proposed != NULL) { 2172 int r = s->ctx->ext.alpn_select_cb(s, &selected, &selected_len, 2173 s->s3->alpn_proposed, 2174 (unsigned int)s->s3->alpn_proposed_len, 2175 s->ctx->ext.alpn_select_cb_arg); 2176 2177 if (r == SSL_TLSEXT_ERR_OK) { 2178 OPENSSL_free(s->s3->alpn_selected); 2179 s->s3->alpn_selected = OPENSSL_memdup(selected, selected_len); 2180 if (s->s3->alpn_selected == NULL) { 2181 s->s3->alpn_selected_len = 0; 2182 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_HANDLE_ALPN, 2183 ERR_R_INTERNAL_ERROR); 2184 return 0; 2185 } 2186 s->s3->alpn_selected_len = selected_len; 2187#ifndef OPENSSL_NO_NEXTPROTONEG 2188 /* ALPN takes precedence over NPN. */ 2189 s->s3->npn_seen = 0; 2190#endif 2191 2192 /* Check ALPN is consistent with session */ 2193 if (s->session->ext.alpn_selected == NULL 2194 || selected_len != s->session->ext.alpn_selected_len 2195 || memcmp(selected, s->session->ext.alpn_selected, 2196 selected_len) != 0) { 2197 /* Not consistent so can't be used for early_data */ 2198 s->ext.early_data_ok = 0; 2199 2200 if (!s->hit) { 2201 /* 2202 * This is a new session and so alpn_selected should have 2203 * been initialised to NULL. We should update it with the 2204 * selected ALPN. 2205 */ 2206 if (!ossl_assert(s->session->ext.alpn_selected == NULL)) { 2207 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2208 SSL_F_TLS_HANDLE_ALPN, 2209 ERR_R_INTERNAL_ERROR); 2210 return 0; 2211 } 2212 s->session->ext.alpn_selected = OPENSSL_memdup(selected, 2213 selected_len); 2214 if (s->session->ext.alpn_selected == NULL) { 2215 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2216 SSL_F_TLS_HANDLE_ALPN, 2217 ERR_R_INTERNAL_ERROR); 2218 return 0; 2219 } 2220 s->session->ext.alpn_selected_len = selected_len; 2221 } 2222 } 2223 2224 return 1; 2225 } else if (r != SSL_TLSEXT_ERR_NOACK) { 2226 SSLfatal(s, SSL_AD_NO_APPLICATION_PROTOCOL, SSL_F_TLS_HANDLE_ALPN, 2227 SSL_R_NO_APPLICATION_PROTOCOL); 2228 return 0; 2229 } 2230 /* 2231 * If r == SSL_TLSEXT_ERR_NOACK then behave as if no callback was 2232 * present. 2233 */ 2234 } 2235 2236 /* Check ALPN is consistent with session */ 2237 if (s->session->ext.alpn_selected != NULL) { 2238 /* Not consistent so can't be used for early_data */ 2239 s->ext.early_data_ok = 0; 2240 } 2241 2242 return 1; 2243} 2244 2245WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst) 2246{ 2247 const SSL_CIPHER *cipher; 2248 2249 if (wst == WORK_MORE_A) { 2250 int rv = tls_early_post_process_client_hello(s); 2251 if (rv == 0) { 2252 /* SSLfatal() was already called */ 2253 goto err; 2254 } 2255 if (rv < 0) 2256 return WORK_MORE_A; 2257 wst = WORK_MORE_B; 2258 } 2259 if (wst == WORK_MORE_B) { 2260 if (!s->hit || SSL_IS_TLS13(s)) { 2261 /* Let cert callback update server certificates if required */ 2262 if (!s->hit && s->cert->cert_cb != NULL) { 2263 int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg); 2264 if (rv == 0) { 2265 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2266 SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, 2267 SSL_R_CERT_CB_ERROR); 2268 goto err; 2269 } 2270 if (rv < 0) { 2271 s->rwstate = SSL_X509_LOOKUP; 2272 return WORK_MORE_B; 2273 } 2274 s->rwstate = SSL_NOTHING; 2275 } 2276 2277 /* In TLSv1.3 we selected the ciphersuite before resumption */ 2278 if (!SSL_IS_TLS13(s)) { 2279 cipher = 2280 ssl3_choose_cipher(s, s->peer_ciphers, SSL_get_ciphers(s)); 2281 2282 if (cipher == NULL) { 2283 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 2284 SSL_F_TLS_POST_PROCESS_CLIENT_HELLO, 2285 SSL_R_NO_SHARED_CIPHER); 2286 goto err; 2287 } 2288 s->s3->tmp.new_cipher = cipher; 2289 } 2290 if (!s->hit) { 2291 if (!tls_choose_sigalg(s, 1)) { 2292 /* SSLfatal already called */ 2293 goto err; 2294 } 2295 /* check whether we should disable session resumption */ 2296 if (s->not_resumable_session_cb != NULL) 2297 s->session->not_resumable = 2298 s->not_resumable_session_cb(s, 2299 ((s->s3->tmp.new_cipher->algorithm_mkey 2300 & (SSL_kDHE | SSL_kECDHE)) != 0)); 2301 if (s->session->not_resumable) 2302 /* do not send a session ticket */ 2303 s->ext.ticket_expected = 0; 2304 } 2305 } else { 2306 /* Session-id reuse */ 2307 s->s3->tmp.new_cipher = s->session->cipher; 2308 } 2309 2310 /*- 2311 * we now have the following setup. 2312 * client_random 2313 * cipher_list - our preferred list of ciphers 2314 * ciphers - the clients preferred list of ciphers 2315 * compression - basically ignored right now 2316 * ssl version is set - sslv3 2317 * s->session - The ssl session has been setup. 2318 * s->hit - session reuse flag 2319 * s->s3->tmp.new_cipher- the new cipher to use. 2320 */ 2321 2322 /* 2323 * Call status_request callback if needed. Has to be done after the 2324 * certificate callbacks etc above. 2325 */ 2326 if (!tls_handle_status_request(s)) { 2327 /* SSLfatal() already called */ 2328 goto err; 2329 } 2330 /* 2331 * Call alpn_select callback if needed. Has to be done after SNI and 2332 * cipher negotiation (HTTP/2 restricts permitted ciphers). In TLSv1.3 2333 * we already did this because cipher negotiation happens earlier, and 2334 * we must handle ALPN before we decide whether to accept early_data. 2335 */ 2336 if (!SSL_IS_TLS13(s) && !tls_handle_alpn(s)) { 2337 /* SSLfatal() already called */ 2338 goto err; 2339 } 2340 2341 wst = WORK_MORE_C; 2342 } 2343#ifndef OPENSSL_NO_SRP 2344 if (wst == WORK_MORE_C) { 2345 int ret; 2346 if ((ret = ssl_check_srp_ext_ClientHello(s)) == 0) { 2347 /* 2348 * callback indicates further work to be done 2349 */ 2350 s->rwstate = SSL_X509_LOOKUP; 2351 return WORK_MORE_C; 2352 } 2353 if (ret < 0) { 2354 /* SSLfatal() already called */ 2355 goto err; 2356 } 2357 } 2358#endif 2359 2360 return WORK_FINISHED_STOP; 2361 err: 2362 return WORK_ERROR; 2363} 2364 2365int tls_construct_server_hello(SSL *s, WPACKET *pkt) 2366{ 2367 int compm; 2368 size_t sl, len; 2369 int version; 2370 unsigned char *session_id; 2371 int usetls13 = SSL_IS_TLS13(s) || s->hello_retry_request == SSL_HRR_PENDING; 2372 2373 version = usetls13 ? TLS1_2_VERSION : s->version; 2374 if (!WPACKET_put_bytes_u16(pkt, version) 2375 /* 2376 * Random stuff. Filling of the server_random takes place in 2377 * tls_process_client_hello() 2378 */ 2379 || !WPACKET_memcpy(pkt, 2380 s->hello_retry_request == SSL_HRR_PENDING 2381 ? hrrrandom : s->s3->server_random, 2382 SSL3_RANDOM_SIZE)) { 2383 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_SERVER_HELLO, 2384 ERR_R_INTERNAL_ERROR); 2385 return 0; 2386 } 2387 2388 /*- 2389 * There are several cases for the session ID to send 2390 * back in the server hello: 2391 * - For session reuse from the session cache, 2392 * we send back the old session ID. 2393 * - If stateless session reuse (using a session ticket) 2394 * is successful, we send back the client's "session ID" 2395 * (which doesn't actually identify the session). 2396 * - If it is a new session, we send back the new 2397 * session ID. 2398 * - However, if we want the new session to be single-use, 2399 * we send back a 0-length session ID. 2400 * - In TLSv1.3 we echo back the session id sent to us by the client 2401 * regardless 2402 * s->hit is non-zero in either case of session reuse, 2403 * so the following won't overwrite an ID that we're supposed 2404 * to send back. 2405 */ 2406 if (s->session->not_resumable || 2407 (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER) 2408 && !s->hit)) 2409 s->session->session_id_length = 0; 2410 2411 if (usetls13) { 2412 sl = s->tmp_session_id_len; 2413 session_id = s->tmp_session_id; 2414 } else { 2415 sl = s->session->session_id_length; 2416 session_id = s->session->session_id; 2417 } 2418 2419 if (sl > sizeof(s->session->session_id)) { 2420 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_SERVER_HELLO, 2421 ERR_R_INTERNAL_ERROR); 2422 return 0; 2423 } 2424 2425 /* set up the compression method */ 2426#ifdef OPENSSL_NO_COMP 2427 compm = 0; 2428#else 2429 if (usetls13 || s->s3->tmp.new_compression == NULL) 2430 compm = 0; 2431 else 2432 compm = s->s3->tmp.new_compression->id; 2433#endif 2434 2435 if (!WPACKET_sub_memcpy_u8(pkt, session_id, sl) 2436 || !s->method->put_cipher_by_char(s->s3->tmp.new_cipher, pkt, &len) 2437 || !WPACKET_put_bytes_u8(pkt, compm)) { 2438 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_SERVER_HELLO, 2439 ERR_R_INTERNAL_ERROR); 2440 return 0; 2441 } 2442 2443 if (!tls_construct_extensions(s, pkt, 2444 s->hello_retry_request == SSL_HRR_PENDING 2445 ? SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST 2446 : (SSL_IS_TLS13(s) 2447 ? SSL_EXT_TLS1_3_SERVER_HELLO 2448 : SSL_EXT_TLS1_2_SERVER_HELLO), 2449 NULL, 0)) { 2450 /* SSLfatal() already called */ 2451 return 0; 2452 } 2453 2454 if (s->hello_retry_request == SSL_HRR_PENDING) { 2455 /* Ditch the session. We'll create a new one next time around */ 2456 SSL_SESSION_free(s->session); 2457 s->session = NULL; 2458 s->hit = 0; 2459 2460 /* 2461 * Re-initialise the Transcript Hash. We're going to prepopulate it with 2462 * a synthetic message_hash in place of ClientHello1. 2463 */ 2464 if (!create_synthetic_message_hash(s, NULL, 0, NULL, 0)) { 2465 /* SSLfatal() already called */ 2466 return 0; 2467 } 2468 } else if (!(s->verify_mode & SSL_VERIFY_PEER) 2469 && !ssl3_digest_cached_records(s, 0)) { 2470 /* SSLfatal() already called */; 2471 return 0; 2472 } 2473 2474 return 1; 2475} 2476 2477int tls_construct_server_done(SSL *s, WPACKET *pkt) 2478{ 2479 if (!s->s3->tmp.cert_request) { 2480 if (!ssl3_digest_cached_records(s, 0)) { 2481 /* SSLfatal() already called */ 2482 return 0; 2483 } 2484 } 2485 return 1; 2486} 2487 2488int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt) 2489{ 2490#ifndef OPENSSL_NO_DH 2491 EVP_PKEY *pkdh = NULL; 2492#endif 2493#ifndef OPENSSL_NO_EC 2494 unsigned char *encodedPoint = NULL; 2495 size_t encodedlen = 0; 2496 int curve_id = 0; 2497#endif 2498 const SIGALG_LOOKUP *lu = s->s3->tmp.sigalg; 2499 int i; 2500 unsigned long type; 2501 const BIGNUM *r[4]; 2502 EVP_MD_CTX *md_ctx = EVP_MD_CTX_new(); 2503 EVP_PKEY_CTX *pctx = NULL; 2504 size_t paramlen, paramoffset; 2505 2506 if (!WPACKET_get_total_written(pkt, ¶moffset)) { 2507 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2508 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 2509 goto err; 2510 } 2511 2512 if (md_ctx == NULL) { 2513 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2514 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); 2515 goto err; 2516 } 2517 2518 type = s->s3->tmp.new_cipher->algorithm_mkey; 2519 2520 r[0] = r[1] = r[2] = r[3] = NULL; 2521#ifndef OPENSSL_NO_PSK 2522 /* Plain PSK or RSAPSK nothing to do */ 2523 if (type & (SSL_kPSK | SSL_kRSAPSK)) { 2524 } else 2525#endif /* !OPENSSL_NO_PSK */ 2526#ifndef OPENSSL_NO_DH 2527 if (type & (SSL_kDHE | SSL_kDHEPSK)) { 2528 CERT *cert = s->cert; 2529 2530 EVP_PKEY *pkdhp = NULL; 2531 DH *dh; 2532 2533 if (s->cert->dh_tmp_auto) { 2534 DH *dhp = ssl_get_auto_dh(s); 2535 pkdh = EVP_PKEY_new(); 2536 if (pkdh == NULL || dhp == NULL) { 2537 DH_free(dhp); 2538 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2539 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2540 ERR_R_INTERNAL_ERROR); 2541 goto err; 2542 } 2543 EVP_PKEY_assign_DH(pkdh, dhp); 2544 pkdhp = pkdh; 2545 } else { 2546 pkdhp = cert->dh_tmp; 2547 } 2548 if ((pkdhp == NULL) && (s->cert->dh_tmp_cb != NULL)) { 2549 DH *dhp = s->cert->dh_tmp_cb(s, 0, 1024); 2550 pkdh = ssl_dh_to_pkey(dhp); 2551 if (pkdh == NULL) { 2552 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2553 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2554 ERR_R_INTERNAL_ERROR); 2555 goto err; 2556 } 2557 pkdhp = pkdh; 2558 } 2559 if (pkdhp == NULL) { 2560 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2561 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2562 SSL_R_MISSING_TMP_DH_KEY); 2563 goto err; 2564 } 2565 if (!ssl_security(s, SSL_SECOP_TMP_DH, 2566 EVP_PKEY_security_bits(pkdhp), 0, pkdhp)) { 2567 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 2568 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2569 SSL_R_DH_KEY_TOO_SMALL); 2570 goto err; 2571 } 2572 if (s->s3->tmp.pkey != NULL) { 2573 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2574 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2575 ERR_R_INTERNAL_ERROR); 2576 goto err; 2577 } 2578 2579 s->s3->tmp.pkey = ssl_generate_pkey(pkdhp); 2580 if (s->s3->tmp.pkey == NULL) { 2581 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 0, ERR_R_INTERNAL_ERROR); 2582 goto err; 2583 } 2584 2585 dh = EVP_PKEY_get0_DH(s->s3->tmp.pkey); 2586 if (dh == NULL) { 2587 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2588 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2589 ERR_R_INTERNAL_ERROR); 2590 goto err; 2591 } 2592 2593 EVP_PKEY_free(pkdh); 2594 pkdh = NULL; 2595 2596 DH_get0_pqg(dh, &r[0], NULL, &r[1]); 2597 DH_get0_key(dh, &r[2], NULL); 2598 } else 2599#endif 2600#ifndef OPENSSL_NO_EC 2601 if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { 2602 2603 if (s->s3->tmp.pkey != NULL) { 2604 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2605 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2606 ERR_R_INTERNAL_ERROR); 2607 goto err; 2608 } 2609 2610 /* Get NID of appropriate shared curve */ 2611 curve_id = tls1_shared_group(s, -2); 2612 if (curve_id == 0) { 2613 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 2614 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2615 SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 2616 goto err; 2617 } 2618 s->s3->tmp.pkey = ssl_generate_pkey_group(s, curve_id); 2619 /* Generate a new key for this curve */ 2620 if (s->s3->tmp.pkey == NULL) { 2621 /* SSLfatal() already called */ 2622 goto err; 2623 } 2624 2625 /* Encode the public key. */ 2626 encodedlen = EVP_PKEY_get1_tls_encodedpoint(s->s3->tmp.pkey, 2627 &encodedPoint); 2628 if (encodedlen == 0) { 2629 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2630 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EC_LIB); 2631 goto err; 2632 } 2633 2634 /* 2635 * We'll generate the serverKeyExchange message explicitly so we 2636 * can set these to NULLs 2637 */ 2638 r[0] = NULL; 2639 r[1] = NULL; 2640 r[2] = NULL; 2641 r[3] = NULL; 2642 } else 2643#endif /* !OPENSSL_NO_EC */ 2644#ifndef OPENSSL_NO_SRP 2645 if (type & SSL_kSRP) { 2646 if ((s->srp_ctx.N == NULL) || 2647 (s->srp_ctx.g == NULL) || 2648 (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) { 2649 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2650 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2651 SSL_R_MISSING_SRP_PARAM); 2652 goto err; 2653 } 2654 r[0] = s->srp_ctx.N; 2655 r[1] = s->srp_ctx.g; 2656 r[2] = s->srp_ctx.s; 2657 r[3] = s->srp_ctx.B; 2658 } else 2659#endif 2660 { 2661 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2662 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2663 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 2664 goto err; 2665 } 2666 2667 if (((s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP)) != 0) 2668 || ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) != 0) { 2669 lu = NULL; 2670 } else if (lu == NULL) { 2671 SSLfatal(s, SSL_AD_DECODE_ERROR, 2672 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 2673 goto err; 2674 } 2675 2676#ifndef OPENSSL_NO_PSK 2677 if (type & SSL_PSK) { 2678 size_t len = (s->cert->psk_identity_hint == NULL) 2679 ? 0 : strlen(s->cert->psk_identity_hint); 2680 2681 /* 2682 * It should not happen that len > PSK_MAX_IDENTITY_LEN - we already 2683 * checked this when we set the identity hint - but just in case 2684 */ 2685 if (len > PSK_MAX_IDENTITY_LEN 2686 || !WPACKET_sub_memcpy_u16(pkt, s->cert->psk_identity_hint, 2687 len)) { 2688 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2689 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2690 ERR_R_INTERNAL_ERROR); 2691 goto err; 2692 } 2693 } 2694#endif 2695 2696 for (i = 0; i < 4 && r[i] != NULL; i++) { 2697 unsigned char *binval; 2698 int res; 2699 2700#ifndef OPENSSL_NO_SRP 2701 if ((i == 2) && (type & SSL_kSRP)) { 2702 res = WPACKET_start_sub_packet_u8(pkt); 2703 } else 2704#endif 2705 res = WPACKET_start_sub_packet_u16(pkt); 2706 2707 if (!res) { 2708 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2709 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2710 ERR_R_INTERNAL_ERROR); 2711 goto err; 2712 } 2713 2714#ifndef OPENSSL_NO_DH 2715 /*- 2716 * for interoperability with some versions of the Microsoft TLS 2717 * stack, we need to zero pad the DHE pub key to the same length 2718 * as the prime 2719 */ 2720 if ((i == 2) && (type & (SSL_kDHE | SSL_kDHEPSK))) { 2721 size_t len = BN_num_bytes(r[0]) - BN_num_bytes(r[2]); 2722 2723 if (len > 0) { 2724 if (!WPACKET_allocate_bytes(pkt, len, &binval)) { 2725 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2726 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2727 ERR_R_INTERNAL_ERROR); 2728 goto err; 2729 } 2730 memset(binval, 0, len); 2731 } 2732 } 2733#endif 2734 if (!WPACKET_allocate_bytes(pkt, BN_num_bytes(r[i]), &binval) 2735 || !WPACKET_close(pkt)) { 2736 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2737 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2738 ERR_R_INTERNAL_ERROR); 2739 goto err; 2740 } 2741 2742 BN_bn2bin(r[i], binval); 2743 } 2744 2745#ifndef OPENSSL_NO_EC 2746 if (type & (SSL_kECDHE | SSL_kECDHEPSK)) { 2747 /* 2748 * We only support named (not generic) curves. In this situation, the 2749 * ServerKeyExchange message has: [1 byte CurveType], [2 byte CurveName] 2750 * [1 byte length of encoded point], followed by the actual encoded 2751 * point itself 2752 */ 2753 if (!WPACKET_put_bytes_u8(pkt, NAMED_CURVE_TYPE) 2754 || !WPACKET_put_bytes_u8(pkt, 0) 2755 || !WPACKET_put_bytes_u8(pkt, curve_id) 2756 || !WPACKET_sub_memcpy_u8(pkt, encodedPoint, encodedlen)) { 2757 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2758 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2759 ERR_R_INTERNAL_ERROR); 2760 goto err; 2761 } 2762 OPENSSL_free(encodedPoint); 2763 encodedPoint = NULL; 2764 } 2765#endif 2766 2767 /* not anonymous */ 2768 if (lu != NULL) { 2769 EVP_PKEY *pkey = s->s3->tmp.cert->privatekey; 2770 const EVP_MD *md; 2771 unsigned char *sigbytes1, *sigbytes2, *tbs; 2772 size_t siglen, tbslen; 2773 int rv; 2774 2775 if (pkey == NULL || !tls1_lookup_md(lu, &md)) { 2776 /* Should never happen */ 2777 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2778 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2779 ERR_R_INTERNAL_ERROR); 2780 goto err; 2781 } 2782 /* Get length of the parameters we have written above */ 2783 if (!WPACKET_get_length(pkt, ¶mlen)) { 2784 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2785 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2786 ERR_R_INTERNAL_ERROR); 2787 goto err; 2788 } 2789 /* send signature algorithm */ 2790 if (SSL_USE_SIGALGS(s) && !WPACKET_put_bytes_u16(pkt, lu->sigalg)) { 2791 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2792 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2793 ERR_R_INTERNAL_ERROR); 2794 goto err; 2795 } 2796 /* 2797 * Create the signature. We don't know the actual length of the sig 2798 * until after we've created it, so we reserve enough bytes for it 2799 * up front, and then properly allocate them in the WPACKET 2800 * afterwards. 2801 */ 2802 siglen = EVP_PKEY_size(pkey); 2803 if (!WPACKET_sub_reserve_bytes_u16(pkt, siglen, &sigbytes1) 2804 || EVP_DigestSignInit(md_ctx, &pctx, md, NULL, pkey) <= 0) { 2805 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2806 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2807 ERR_R_INTERNAL_ERROR); 2808 goto err; 2809 } 2810 if (lu->sig == EVP_PKEY_RSA_PSS) { 2811 if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0 2812 || EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, RSA_PSS_SALTLEN_DIGEST) <= 0) { 2813 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2814 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2815 ERR_R_EVP_LIB); 2816 goto err; 2817 } 2818 } 2819 tbslen = construct_key_exchange_tbs(s, &tbs, 2820 s->init_buf->data + paramoffset, 2821 paramlen); 2822 if (tbslen == 0) { 2823 /* SSLfatal() already called */ 2824 goto err; 2825 } 2826 rv = EVP_DigestSign(md_ctx, sigbytes1, &siglen, tbs, tbslen); 2827 OPENSSL_free(tbs); 2828 if (rv <= 0 || !WPACKET_sub_allocate_bytes_u16(pkt, siglen, &sigbytes2) 2829 || sigbytes1 != sigbytes2) { 2830 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2831 SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, 2832 ERR_R_INTERNAL_ERROR); 2833 goto err; 2834 } 2835 } 2836 2837 EVP_MD_CTX_free(md_ctx); 2838 return 1; 2839 err: 2840#ifndef OPENSSL_NO_DH 2841 EVP_PKEY_free(pkdh); 2842#endif 2843#ifndef OPENSSL_NO_EC 2844 OPENSSL_free(encodedPoint); 2845#endif 2846 EVP_MD_CTX_free(md_ctx); 2847 return 0; 2848} 2849 2850int tls_construct_certificate_request(SSL *s, WPACKET *pkt) 2851{ 2852 if (SSL_IS_TLS13(s)) { 2853 /* Send random context when doing post-handshake auth */ 2854 if (s->post_handshake_auth == SSL_PHA_REQUEST_PENDING) { 2855 OPENSSL_free(s->pha_context); 2856 s->pha_context_len = 32; 2857 if ((s->pha_context = OPENSSL_malloc(s->pha_context_len)) == NULL) { 2858 s->pha_context_len = 0; 2859 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2860 SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, 2861 ERR_R_INTERNAL_ERROR); 2862 return 0; 2863 } 2864 if (RAND_bytes(s->pha_context, s->pha_context_len) <= 0 2865 || !WPACKET_sub_memcpy_u8(pkt, s->pha_context, 2866 s->pha_context_len)) { 2867 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2868 SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, 2869 ERR_R_INTERNAL_ERROR); 2870 return 0; 2871 } 2872 /* reset the handshake hash back to just after the ClientFinished */ 2873 if (!tls13_restore_handshake_digest_for_pha(s)) { 2874 /* SSLfatal() already called */ 2875 return 0; 2876 } 2877 } else { 2878 if (!WPACKET_put_bytes_u8(pkt, 0)) { 2879 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2880 SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, 2881 ERR_R_INTERNAL_ERROR); 2882 return 0; 2883 } 2884 } 2885 2886 if (!tls_construct_extensions(s, pkt, 2887 SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, NULL, 2888 0)) { 2889 /* SSLfatal() already called */ 2890 return 0; 2891 } 2892 goto done; 2893 } 2894 2895 /* get the list of acceptable cert types */ 2896 if (!WPACKET_start_sub_packet_u8(pkt) 2897 || !ssl3_get_req_cert_type(s, pkt) || !WPACKET_close(pkt)) { 2898 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2899 SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR); 2900 return 0; 2901 } 2902 2903 if (SSL_USE_SIGALGS(s)) { 2904 const uint16_t *psigs; 2905 size_t nl = tls12_get_psigalgs(s, 1, &psigs); 2906 2907 if (!WPACKET_start_sub_packet_u16(pkt) 2908 || !WPACKET_set_flags(pkt, WPACKET_FLAGS_NON_ZERO_LENGTH) 2909 || !tls12_copy_sigalgs(s, pkt, psigs, nl) 2910 || !WPACKET_close(pkt)) { 2911 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2912 SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, 2913 ERR_R_INTERNAL_ERROR); 2914 return 0; 2915 } 2916 } 2917 2918 if (!construct_ca_names(s, get_ca_names(s), pkt)) { 2919 /* SSLfatal() already called */ 2920 return 0; 2921 } 2922 2923 done: 2924 s->certreqs_sent++; 2925 s->s3->tmp.cert_request = 1; 2926 return 1; 2927} 2928 2929static int tls_process_cke_psk_preamble(SSL *s, PACKET *pkt) 2930{ 2931#ifndef OPENSSL_NO_PSK 2932 unsigned char psk[PSK_MAX_PSK_LEN]; 2933 size_t psklen; 2934 PACKET psk_identity; 2935 2936 if (!PACKET_get_length_prefixed_2(pkt, &psk_identity)) { 2937 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, 2938 SSL_R_LENGTH_MISMATCH); 2939 return 0; 2940 } 2941 if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) { 2942 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, 2943 SSL_R_DATA_LENGTH_TOO_LONG); 2944 return 0; 2945 } 2946 if (s->psk_server_callback == NULL) { 2947 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, 2948 SSL_R_PSK_NO_SERVER_CB); 2949 return 0; 2950 } 2951 2952 if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) { 2953 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, 2954 ERR_R_INTERNAL_ERROR); 2955 return 0; 2956 } 2957 2958 psklen = s->psk_server_callback(s, s->session->psk_identity, 2959 psk, sizeof(psk)); 2960 2961 if (psklen > PSK_MAX_PSK_LEN) { 2962 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, 2963 ERR_R_INTERNAL_ERROR); 2964 return 0; 2965 } else if (psklen == 0) { 2966 /* 2967 * PSK related to the given identity not found 2968 */ 2969 SSLfatal(s, SSL_AD_UNKNOWN_PSK_IDENTITY, 2970 SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, 2971 SSL_R_PSK_IDENTITY_NOT_FOUND); 2972 return 0; 2973 } 2974 2975 OPENSSL_free(s->s3->tmp.psk); 2976 s->s3->tmp.psk = OPENSSL_memdup(psk, psklen); 2977 OPENSSL_cleanse(psk, psklen); 2978 2979 if (s->s3->tmp.psk == NULL) { 2980 s->s3->tmp.psklen = 0; 2981 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2982 SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_MALLOC_FAILURE); 2983 return 0; 2984 } 2985 2986 s->s3->tmp.psklen = psklen; 2987 2988 return 1; 2989#else 2990 /* Should never happen */ 2991 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, 2992 ERR_R_INTERNAL_ERROR); 2993 return 0; 2994#endif 2995} 2996 2997static int tls_process_cke_rsa(SSL *s, PACKET *pkt) 2998{ 2999#ifndef OPENSSL_NO_RSA 3000 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH]; 3001 int decrypt_len; 3002 unsigned char decrypt_good, version_good; 3003 size_t j, padding_len; 3004 PACKET enc_premaster; 3005 RSA *rsa = NULL; 3006 unsigned char *rsa_decrypt = NULL; 3007 int ret = 0; 3008 3009 rsa = EVP_PKEY_get0_RSA(s->cert->pkeys[SSL_PKEY_RSA].privatekey); 3010 if (rsa == NULL) { 3011 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_RSA, 3012 SSL_R_MISSING_RSA_CERTIFICATE); 3013 return 0; 3014 } 3015 3016 /* SSLv3 and pre-standard DTLS omit the length bytes. */ 3017 if (s->version == SSL3_VERSION || s->version == DTLS1_BAD_VER) { 3018 enc_premaster = *pkt; 3019 } else { 3020 if (!PACKET_get_length_prefixed_2(pkt, &enc_premaster) 3021 || PACKET_remaining(pkt) != 0) { 3022 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_RSA, 3023 SSL_R_LENGTH_MISMATCH); 3024 return 0; 3025 } 3026 } 3027 3028 /* 3029 * We want to be sure that the plaintext buffer size makes it safe to 3030 * iterate over the entire size of a premaster secret 3031 * (SSL_MAX_MASTER_KEY_LENGTH). Reject overly short RSA keys because 3032 * their ciphertext cannot accommodate a premaster secret anyway. 3033 */ 3034 if (RSA_size(rsa) < SSL_MAX_MASTER_KEY_LENGTH) { 3035 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_RSA, 3036 RSA_R_KEY_SIZE_TOO_SMALL); 3037 return 0; 3038 } 3039 3040 rsa_decrypt = OPENSSL_malloc(RSA_size(rsa)); 3041 if (rsa_decrypt == NULL) { 3042 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_RSA, 3043 ERR_R_MALLOC_FAILURE); 3044 return 0; 3045 } 3046 3047 /* 3048 * We must not leak whether a decryption failure occurs because of 3049 * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246, 3050 * section 7.4.7.1). The code follows that advice of the TLS RFC and 3051 * generates a random premaster secret for the case that the decrypt 3052 * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1 3053 */ 3054 3055 if (RAND_priv_bytes(rand_premaster_secret, 3056 sizeof(rand_premaster_secret)) <= 0) { 3057 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_RSA, 3058 ERR_R_INTERNAL_ERROR); 3059 goto err; 3060 } 3061 3062 /* 3063 * Decrypt with no padding. PKCS#1 padding will be removed as part of 3064 * the timing-sensitive code below. 3065 */ 3066 /* TODO(size_t): Convert this function */ 3067 decrypt_len = (int)RSA_private_decrypt((int)PACKET_remaining(&enc_premaster), 3068 PACKET_data(&enc_premaster), 3069 rsa_decrypt, rsa, RSA_NO_PADDING); 3070 if (decrypt_len < 0) { 3071 SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_F_TLS_PROCESS_CKE_RSA, 3072 ERR_R_INTERNAL_ERROR); 3073 goto err; 3074 } 3075 3076 /* Check the padding. See RFC 3447, section 7.2.2. */ 3077 3078 /* 3079 * The smallest padded premaster is 11 bytes of overhead. Small keys 3080 * are publicly invalid, so this may return immediately. This ensures 3081 * PS is at least 8 bytes. 3082 */ 3083 if (decrypt_len < 11 + SSL_MAX_MASTER_KEY_LENGTH) { 3084 SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_F_TLS_PROCESS_CKE_RSA, 3085 SSL_R_DECRYPTION_FAILED); 3086 goto err; 3087 } 3088 3089 padding_len = decrypt_len - SSL_MAX_MASTER_KEY_LENGTH; 3090 decrypt_good = constant_time_eq_int_8(rsa_decrypt[0], 0) & 3091 constant_time_eq_int_8(rsa_decrypt[1], 2); 3092 for (j = 2; j < padding_len - 1; j++) { 3093 decrypt_good &= ~constant_time_is_zero_8(rsa_decrypt[j]); 3094 } 3095 decrypt_good &= constant_time_is_zero_8(rsa_decrypt[padding_len - 1]); 3096 3097 /* 3098 * If the version in the decrypted pre-master secret is correct then 3099 * version_good will be 0xff, otherwise it'll be zero. The 3100 * Klima-Pokorny-Rosa extension of Bleichenbacher's attack 3101 * (http://eprint.iacr.org/2003/052/) exploits the version number 3102 * check as a "bad version oracle". Thus version checks are done in 3103 * constant time and are treated like any other decryption error. 3104 */ 3105 version_good = 3106 constant_time_eq_8(rsa_decrypt[padding_len], 3107 (unsigned)(s->client_version >> 8)); 3108 version_good &= 3109 constant_time_eq_8(rsa_decrypt[padding_len + 1], 3110 (unsigned)(s->client_version & 0xff)); 3111 3112 /* 3113 * The premaster secret must contain the same version number as the 3114 * ClientHello to detect version rollback attacks (strangely, the 3115 * protocol does not offer such protection for DH ciphersuites). 3116 * However, buggy clients exist that send the negotiated protocol 3117 * version instead if the server does not support the requested 3118 * protocol version. If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such 3119 * clients. 3120 */ 3121 if (s->options & SSL_OP_TLS_ROLLBACK_BUG) { 3122 unsigned char workaround_good; 3123 workaround_good = constant_time_eq_8(rsa_decrypt[padding_len], 3124 (unsigned)(s->version >> 8)); 3125 workaround_good &= 3126 constant_time_eq_8(rsa_decrypt[padding_len + 1], 3127 (unsigned)(s->version & 0xff)); 3128 version_good |= workaround_good; 3129 } 3130 3131 /* 3132 * Both decryption and version must be good for decrypt_good to 3133 * remain non-zero (0xff). 3134 */ 3135 decrypt_good &= version_good; 3136 3137 /* 3138 * Now copy rand_premaster_secret over from p using 3139 * decrypt_good_mask. If decryption failed, then p does not 3140 * contain valid plaintext, however, a check above guarantees 3141 * it is still sufficiently large to read from. 3142 */ 3143 for (j = 0; j < sizeof(rand_premaster_secret); j++) { 3144 rsa_decrypt[padding_len + j] = 3145 constant_time_select_8(decrypt_good, 3146 rsa_decrypt[padding_len + j], 3147 rand_premaster_secret[j]); 3148 } 3149 3150 if (!ssl_generate_master_secret(s, rsa_decrypt + padding_len, 3151 sizeof(rand_premaster_secret), 0)) { 3152 /* SSLfatal() already called */ 3153 goto err; 3154 } 3155 3156 ret = 1; 3157 err: 3158 OPENSSL_free(rsa_decrypt); 3159 return ret; 3160#else 3161 /* Should never happen */ 3162 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_RSA, 3163 ERR_R_INTERNAL_ERROR); 3164 return 0; 3165#endif 3166} 3167 3168static int tls_process_cke_dhe(SSL *s, PACKET *pkt) 3169{ 3170#ifndef OPENSSL_NO_DH 3171 EVP_PKEY *skey = NULL; 3172 DH *cdh; 3173 unsigned int i; 3174 BIGNUM *pub_key; 3175 const unsigned char *data; 3176 EVP_PKEY *ckey = NULL; 3177 int ret = 0; 3178 3179 if (!PACKET_get_net_2(pkt, &i) || PACKET_remaining(pkt) != i) { 3180 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_DHE, 3181 SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); 3182 goto err; 3183 } 3184 skey = s->s3->tmp.pkey; 3185 if (skey == NULL) { 3186 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_DHE, 3187 SSL_R_MISSING_TMP_DH_KEY); 3188 goto err; 3189 } 3190 3191 if (PACKET_remaining(pkt) == 0L) { 3192 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_DHE, 3193 SSL_R_MISSING_TMP_DH_KEY); 3194 goto err; 3195 } 3196 if (!PACKET_get_bytes(pkt, &data, i)) { 3197 /* We already checked we have enough data */ 3198 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_DHE, 3199 ERR_R_INTERNAL_ERROR); 3200 goto err; 3201 } 3202 ckey = EVP_PKEY_new(); 3203 if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) == 0) { 3204 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_DHE, 3205 SSL_R_BN_LIB); 3206 goto err; 3207 } 3208 3209 cdh = EVP_PKEY_get0_DH(ckey); 3210 pub_key = BN_bin2bn(data, i, NULL); 3211 if (pub_key == NULL || cdh == NULL || !DH_set0_key(cdh, pub_key, NULL)) { 3212 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_DHE, 3213 ERR_R_INTERNAL_ERROR); 3214 BN_free(pub_key); 3215 goto err; 3216 } 3217 3218 if (ssl_derive(s, skey, ckey, 1) == 0) { 3219 /* SSLfatal() already called */ 3220 goto err; 3221 } 3222 3223 ret = 1; 3224 EVP_PKEY_free(s->s3->tmp.pkey); 3225 s->s3->tmp.pkey = NULL; 3226 err: 3227 EVP_PKEY_free(ckey); 3228 return ret; 3229#else 3230 /* Should never happen */ 3231 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_DHE, 3232 ERR_R_INTERNAL_ERROR); 3233 return 0; 3234#endif 3235} 3236 3237static int tls_process_cke_ecdhe(SSL *s, PACKET *pkt) 3238{ 3239#ifndef OPENSSL_NO_EC 3240 EVP_PKEY *skey = s->s3->tmp.pkey; 3241 EVP_PKEY *ckey = NULL; 3242 int ret = 0; 3243 3244 if (PACKET_remaining(pkt) == 0L) { 3245 /* We don't support ECDH client auth */ 3246 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS_PROCESS_CKE_ECDHE, 3247 SSL_R_MISSING_TMP_ECDH_KEY); 3248 goto err; 3249 } else { 3250 unsigned int i; 3251 const unsigned char *data; 3252 3253 /* 3254 * Get client's public key from encoded point in the 3255 * ClientKeyExchange message. 3256 */ 3257 3258 /* Get encoded point length */ 3259 if (!PACKET_get_1(pkt, &i) || !PACKET_get_bytes(pkt, &data, i) 3260 || PACKET_remaining(pkt) != 0) { 3261 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_ECDHE, 3262 SSL_R_LENGTH_MISMATCH); 3263 goto err; 3264 } 3265 if (skey == NULL) { 3266 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_ECDHE, 3267 SSL_R_MISSING_TMP_ECDH_KEY); 3268 goto err; 3269 } 3270 3271 ckey = EVP_PKEY_new(); 3272 if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) <= 0) { 3273 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_ECDHE, 3274 ERR_R_EVP_LIB); 3275 goto err; 3276 } 3277 if (EVP_PKEY_set1_tls_encodedpoint(ckey, data, i) == 0) { 3278 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_ECDHE, 3279 ERR_R_EC_LIB); 3280 goto err; 3281 } 3282 } 3283 3284 if (ssl_derive(s, skey, ckey, 1) == 0) { 3285 /* SSLfatal() already called */ 3286 goto err; 3287 } 3288 3289 ret = 1; 3290 EVP_PKEY_free(s->s3->tmp.pkey); 3291 s->s3->tmp.pkey = NULL; 3292 err: 3293 EVP_PKEY_free(ckey); 3294 3295 return ret; 3296#else 3297 /* Should never happen */ 3298 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_ECDHE, 3299 ERR_R_INTERNAL_ERROR); 3300 return 0; 3301#endif 3302} 3303 3304static int tls_process_cke_srp(SSL *s, PACKET *pkt) 3305{ 3306#ifndef OPENSSL_NO_SRP 3307 unsigned int i; 3308 const unsigned char *data; 3309 3310 if (!PACKET_get_net_2(pkt, &i) 3311 || !PACKET_get_bytes(pkt, &data, i)) { 3312 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_SRP, 3313 SSL_R_BAD_SRP_A_LENGTH); 3314 return 0; 3315 } 3316 if ((s->srp_ctx.A = BN_bin2bn(data, i, NULL)) == NULL) { 3317 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_SRP, 3318 ERR_R_BN_LIB); 3319 return 0; 3320 } 3321 if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0 || BN_is_zero(s->srp_ctx.A)) { 3322 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PROCESS_CKE_SRP, 3323 SSL_R_BAD_SRP_PARAMETERS); 3324 return 0; 3325 } 3326 OPENSSL_free(s->session->srp_username); 3327 s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login); 3328 if (s->session->srp_username == NULL) { 3329 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_SRP, 3330 ERR_R_MALLOC_FAILURE); 3331 return 0; 3332 } 3333 3334 if (!srp_generate_server_master_secret(s)) { 3335 /* SSLfatal() already called */ 3336 return 0; 3337 } 3338 3339 return 1; 3340#else 3341 /* Should never happen */ 3342 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_SRP, 3343 ERR_R_INTERNAL_ERROR); 3344 return 0; 3345#endif 3346} 3347 3348static int tls_process_cke_gost(SSL *s, PACKET *pkt) 3349{ 3350#ifndef OPENSSL_NO_GOST 3351 EVP_PKEY_CTX *pkey_ctx; 3352 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; 3353 unsigned char premaster_secret[32]; 3354 const unsigned char *start; 3355 size_t outlen = 32, inlen; 3356 unsigned long alg_a; 3357 GOST_KX_MESSAGE *pKX = NULL; 3358 const unsigned char *ptr; 3359 int ret = 0; 3360 3361 /* Get our certificate private key */ 3362 alg_a = s->s3->tmp.new_cipher->algorithm_auth; 3363 if (alg_a & SSL_aGOST12) { 3364 /* 3365 * New GOST ciphersuites have SSL_aGOST01 bit too 3366 */ 3367 pk = s->cert->pkeys[SSL_PKEY_GOST12_512].privatekey; 3368 if (pk == NULL) { 3369 pk = s->cert->pkeys[SSL_PKEY_GOST12_256].privatekey; 3370 } 3371 if (pk == NULL) { 3372 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; 3373 } 3374 } else if (alg_a & SSL_aGOST01) { 3375 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; 3376 } 3377 3378 pkey_ctx = EVP_PKEY_CTX_new(pk, NULL); 3379 if (pkey_ctx == NULL) { 3380 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_GOST, 3381 ERR_R_MALLOC_FAILURE); 3382 return 0; 3383 } 3384 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) { 3385 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_GOST, 3386 ERR_R_INTERNAL_ERROR); 3387 return 0; 3388 } 3389 /* 3390 * If client certificate is present and is of the same type, maybe 3391 * use it for key exchange. Don't mind errors from 3392 * EVP_PKEY_derive_set_peer, because it is completely valid to use a 3393 * client certificate for authorization only. 3394 */ 3395 client_pub_pkey = X509_get0_pubkey(s->session->peer); 3396 if (client_pub_pkey) { 3397 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0) 3398 ERR_clear_error(); 3399 } 3400 3401 ptr = PACKET_data(pkt); 3402 /* Some implementations provide extra data in the opaqueBlob 3403 * We have nothing to do with this blob so we just skip it */ 3404 pKX = d2i_GOST_KX_MESSAGE(NULL, &ptr, PACKET_remaining(pkt)); 3405 if (pKX == NULL 3406 || pKX->kxBlob == NULL 3407 || ASN1_TYPE_get(pKX->kxBlob) != V_ASN1_SEQUENCE) { 3408 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_GOST, 3409 SSL_R_DECRYPTION_FAILED); 3410 goto err; 3411 } 3412 3413 if (!PACKET_forward(pkt, ptr - PACKET_data(pkt))) { 3414 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_GOST, 3415 SSL_R_DECRYPTION_FAILED); 3416 goto err; 3417 } 3418 3419 if (PACKET_remaining(pkt) != 0) { 3420 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_GOST, 3421 SSL_R_DECRYPTION_FAILED); 3422 goto err; 3423 } 3424 3425 inlen = pKX->kxBlob->value.sequence->length; 3426 start = pKX->kxBlob->value.sequence->data; 3427 3428 if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen, start, 3429 inlen) <= 0) { 3430 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CKE_GOST, 3431 SSL_R_DECRYPTION_FAILED); 3432 goto err; 3433 } 3434 /* Generate master secret */ 3435 if (!ssl_generate_master_secret(s, premaster_secret, 3436 sizeof(premaster_secret), 0)) { 3437 /* SSLfatal() already called */ 3438 goto err; 3439 } 3440 /* Check if pubkey from client certificate was used */ 3441 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 3442 NULL) > 0) 3443 s->statem.no_cert_verify = 1; 3444 3445 ret = 1; 3446 err: 3447 EVP_PKEY_CTX_free(pkey_ctx); 3448 GOST_KX_MESSAGE_free(pKX); 3449 return ret; 3450#else 3451 /* Should never happen */ 3452 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CKE_GOST, 3453 ERR_R_INTERNAL_ERROR); 3454 return 0; 3455#endif 3456} 3457 3458MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt) 3459{ 3460 unsigned long alg_k; 3461 3462 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 3463 3464 /* For PSK parse and retrieve identity, obtain PSK key */ 3465 if ((alg_k & SSL_PSK) && !tls_process_cke_psk_preamble(s, pkt)) { 3466 /* SSLfatal() already called */ 3467 goto err; 3468 } 3469 3470 if (alg_k & SSL_kPSK) { 3471 /* Identity extracted earlier: should be nothing left */ 3472 if (PACKET_remaining(pkt) != 0) { 3473 SSLfatal(s, SSL_AD_DECODE_ERROR, 3474 SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, 3475 SSL_R_LENGTH_MISMATCH); 3476 goto err; 3477 } 3478 /* PSK handled by ssl_generate_master_secret */ 3479 if (!ssl_generate_master_secret(s, NULL, 0, 0)) { 3480 /* SSLfatal() already called */ 3481 goto err; 3482 } 3483 } else if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) { 3484 if (!tls_process_cke_rsa(s, pkt)) { 3485 /* SSLfatal() already called */ 3486 goto err; 3487 } 3488 } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) { 3489 if (!tls_process_cke_dhe(s, pkt)) { 3490 /* SSLfatal() already called */ 3491 goto err; 3492 } 3493 } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) { 3494 if (!tls_process_cke_ecdhe(s, pkt)) { 3495 /* SSLfatal() already called */ 3496 goto err; 3497 } 3498 } else if (alg_k & SSL_kSRP) { 3499 if (!tls_process_cke_srp(s, pkt)) { 3500 /* SSLfatal() already called */ 3501 goto err; 3502 } 3503 } else if (alg_k & SSL_kGOST) { 3504 if (!tls_process_cke_gost(s, pkt)) { 3505 /* SSLfatal() already called */ 3506 goto err; 3507 } 3508 } else { 3509 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3510 SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, 3511 SSL_R_UNKNOWN_CIPHER_TYPE); 3512 goto err; 3513 } 3514 3515 return MSG_PROCESS_CONTINUE_PROCESSING; 3516 err: 3517#ifndef OPENSSL_NO_PSK 3518 OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen); 3519 s->s3->tmp.psk = NULL; 3520 s->s3->tmp.psklen = 0; 3521#endif 3522 return MSG_PROCESS_ERROR; 3523} 3524 3525WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst) 3526{ 3527#ifndef OPENSSL_NO_SCTP 3528 if (wst == WORK_MORE_A) { 3529 if (SSL_IS_DTLS(s)) { 3530 unsigned char sctpauthkey[64]; 3531 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; 3532 size_t labellen; 3533 /* 3534 * Add new shared key for SCTP-Auth, will be ignored if no SCTP 3535 * used. 3536 */ 3537 memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, 3538 sizeof(DTLS1_SCTP_AUTH_LABEL)); 3539 3540 /* Don't include the terminating zero. */ 3541 labellen = sizeof(labelbuffer) - 1; 3542 if (s->mode & SSL_MODE_DTLS_SCTP_LABEL_LENGTH_BUG) 3543 labellen += 1; 3544 3545 if (SSL_export_keying_material(s, sctpauthkey, 3546 sizeof(sctpauthkey), labelbuffer, 3547 labellen, NULL, 0, 3548 0) <= 0) { 3549 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3550 SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE, 3551 ERR_R_INTERNAL_ERROR); 3552 return WORK_ERROR; 3553 } 3554 3555 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 3556 sizeof(sctpauthkey), sctpauthkey); 3557 } 3558 } 3559#endif 3560 3561 if (s->statem.no_cert_verify || !s->session->peer) { 3562 /* 3563 * No certificate verify or no peer certificate so we no longer need 3564 * the handshake_buffer 3565 */ 3566 if (!ssl3_digest_cached_records(s, 0)) { 3567 /* SSLfatal() already called */ 3568 return WORK_ERROR; 3569 } 3570 return WORK_FINISHED_CONTINUE; 3571 } else { 3572 if (!s->s3->handshake_buffer) { 3573 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3574 SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE, 3575 ERR_R_INTERNAL_ERROR); 3576 return WORK_ERROR; 3577 } 3578 /* 3579 * For sigalgs freeze the handshake buffer. If we support 3580 * extms we've done this already so this is a no-op 3581 */ 3582 if (!ssl3_digest_cached_records(s, 1)) { 3583 /* SSLfatal() already called */ 3584 return WORK_ERROR; 3585 } 3586 } 3587 3588 return WORK_FINISHED_CONTINUE; 3589} 3590 3591MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt) 3592{ 3593 int i; 3594 MSG_PROCESS_RETURN ret = MSG_PROCESS_ERROR; 3595 X509 *x = NULL; 3596 unsigned long l; 3597 const unsigned char *certstart, *certbytes; 3598 STACK_OF(X509) *sk = NULL; 3599 PACKET spkt, context; 3600 size_t chainidx; 3601 SSL_SESSION *new_sess = NULL; 3602 3603 /* 3604 * To get this far we must have read encrypted data from the client. We no 3605 * longer tolerate unencrypted alerts. This value is ignored if less than 3606 * TLSv1.3 3607 */ 3608 s->statem.enc_read_state = ENC_READ_STATE_VALID; 3609 3610 if ((sk = sk_X509_new_null()) == NULL) { 3611 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, 3612 ERR_R_MALLOC_FAILURE); 3613 goto err; 3614 } 3615 3616 if (SSL_IS_TLS13(s) && (!PACKET_get_length_prefixed_1(pkt, &context) 3617 || (s->pha_context == NULL && PACKET_remaining(&context) != 0) 3618 || (s->pha_context != NULL && 3619 !PACKET_equal(&context, s->pha_context, s->pha_context_len)))) { 3620 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, 3621 SSL_R_INVALID_CONTEXT); 3622 goto err; 3623 } 3624 3625 if (!PACKET_get_length_prefixed_3(pkt, &spkt) 3626 || PACKET_remaining(pkt) != 0) { 3627 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, 3628 SSL_R_LENGTH_MISMATCH); 3629 goto err; 3630 } 3631 3632 for (chainidx = 0; PACKET_remaining(&spkt) > 0; chainidx++) { 3633 if (!PACKET_get_net_3(&spkt, &l) 3634 || !PACKET_get_bytes(&spkt, &certbytes, l)) { 3635 SSLfatal(s, SSL_AD_DECODE_ERROR, 3636 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, 3637 SSL_R_CERT_LENGTH_MISMATCH); 3638 goto err; 3639 } 3640 3641 certstart = certbytes; 3642 x = d2i_X509(NULL, (const unsigned char **)&certbytes, l); 3643 if (x == NULL) { 3644 SSLfatal(s, SSL_AD_DECODE_ERROR, 3645 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB); 3646 goto err; 3647 } 3648 if (certbytes != (certstart + l)) { 3649 SSLfatal(s, SSL_AD_DECODE_ERROR, 3650 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, 3651 SSL_R_CERT_LENGTH_MISMATCH); 3652 goto err; 3653 } 3654 3655 if (SSL_IS_TLS13(s)) { 3656 RAW_EXTENSION *rawexts = NULL; 3657 PACKET extensions; 3658 3659 if (!PACKET_get_length_prefixed_2(&spkt, &extensions)) { 3660 SSLfatal(s, SSL_AD_DECODE_ERROR, 3661 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, 3662 SSL_R_BAD_LENGTH); 3663 goto err; 3664 } 3665 if (!tls_collect_extensions(s, &extensions, 3666 SSL_EXT_TLS1_3_CERTIFICATE, &rawexts, 3667 NULL, chainidx == 0) 3668 || !tls_parse_all_extensions(s, SSL_EXT_TLS1_3_CERTIFICATE, 3669 rawexts, x, chainidx, 3670 PACKET_remaining(&spkt) == 0)) { 3671 OPENSSL_free(rawexts); 3672 goto err; 3673 } 3674 OPENSSL_free(rawexts); 3675 } 3676 3677 if (!sk_X509_push(sk, x)) { 3678 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3679 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, 3680 ERR_R_MALLOC_FAILURE); 3681 goto err; 3682 } 3683 x = NULL; 3684 } 3685 3686 if (sk_X509_num(sk) <= 0) { 3687 /* TLS does not mind 0 certs returned */ 3688 if (s->version == SSL3_VERSION) { 3689 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 3690 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, 3691 SSL_R_NO_CERTIFICATES_RETURNED); 3692 goto err; 3693 } 3694 /* Fail for TLS only if we required a certificate */ 3695 else if ((s->verify_mode & SSL_VERIFY_PEER) && 3696 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 3697 SSLfatal(s, SSL_AD_CERTIFICATE_REQUIRED, 3698 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, 3699 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 3700 goto err; 3701 } 3702 /* No client certificate so digest cached records */ 3703 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) { 3704 /* SSLfatal() already called */ 3705 goto err; 3706 } 3707 } else { 3708 EVP_PKEY *pkey; 3709 i = ssl_verify_cert_chain(s, sk); 3710 if (i <= 0) { 3711 SSLfatal(s, ssl_x509err2alert(s->verify_result), 3712 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, 3713 SSL_R_CERTIFICATE_VERIFY_FAILED); 3714 goto err; 3715 } 3716 if (i > 1) { 3717 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 3718 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i); 3719 goto err; 3720 } 3721 pkey = X509_get0_pubkey(sk_X509_value(sk, 0)); 3722 if (pkey == NULL) { 3723 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 3724 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, 3725 SSL_R_UNKNOWN_CERTIFICATE_TYPE); 3726 goto err; 3727 } 3728 } 3729 3730 /* 3731 * Sessions must be immutable once they go into the session cache. Otherwise 3732 * we can get multi-thread problems. Therefore we don't "update" sessions, 3733 * we replace them with a duplicate. Here, we need to do this every time 3734 * a new certificate is received via post-handshake authentication, as the 3735 * session may have already gone into the session cache. 3736 */ 3737 3738 if (s->post_handshake_auth == SSL_PHA_REQUESTED) { 3739 if ((new_sess = ssl_session_dup(s->session, 0)) == 0) { 3740 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3741 SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, 3742 ERR_R_MALLOC_FAILURE); 3743 goto err; 3744 } 3745 3746 SSL_SESSION_free(s->session); 3747 s->session = new_sess; 3748 } 3749 3750 X509_free(s->session->peer); 3751 s->session->peer = sk_X509_shift(sk); 3752 s->session->verify_result = s->verify_result; 3753 3754 sk_X509_pop_free(s->session->peer_chain, X509_free); 3755 s->session->peer_chain = sk; 3756 3757 /* 3758 * Freeze the handshake buffer. For <TLS1.3 we do this after the CKE 3759 * message 3760 */ 3761 if (SSL_IS_TLS13(s) && !ssl3_digest_cached_records(s, 1)) { 3762 /* SSLfatal() already called */ 3763 goto err; 3764 } 3765 3766 /* 3767 * Inconsistency alert: cert_chain does *not* include the peer's own 3768 * certificate, while we do include it in statem_clnt.c 3769 */ 3770 sk = NULL; 3771 3772 /* Save the current hash state for when we receive the CertificateVerify */ 3773 if (SSL_IS_TLS13(s)) { 3774 if (!ssl_handshake_hash(s, s->cert_verify_hash, 3775 sizeof(s->cert_verify_hash), 3776 &s->cert_verify_hash_len)) { 3777 /* SSLfatal() already called */ 3778 goto err; 3779 } 3780 3781 /* Resend session tickets */ 3782 s->sent_tickets = 0; 3783 } 3784 3785 ret = MSG_PROCESS_CONTINUE_READING; 3786 3787 err: 3788 X509_free(x); 3789 sk_X509_pop_free(sk, X509_free); 3790 return ret; 3791} 3792 3793int tls_construct_server_certificate(SSL *s, WPACKET *pkt) 3794{ 3795 CERT_PKEY *cpk = s->s3->tmp.cert; 3796 3797 if (cpk == NULL) { 3798 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3799 SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); 3800 return 0; 3801 } 3802 3803 /* 3804 * In TLSv1.3 the certificate chain is always preceded by a 0 length context 3805 * for the server Certificate message 3806 */ 3807 if (SSL_IS_TLS13(s) && !WPACKET_put_bytes_u8(pkt, 0)) { 3808 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3809 SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); 3810 return 0; 3811 } 3812 if (!ssl3_output_cert_chain(s, pkt, cpk)) { 3813 /* SSLfatal() already called */ 3814 return 0; 3815 } 3816 3817 return 1; 3818} 3819 3820static int create_ticket_prequel(SSL *s, WPACKET *pkt, uint32_t age_add, 3821 unsigned char *tick_nonce) 3822{ 3823 /* 3824 * Ticket lifetime hint: For TLSv1.2 this is advisory only and we leave this 3825 * unspecified for resumed session (for simplicity). 3826 * In TLSv1.3 we reset the "time" field above, and always specify the 3827 * timeout. 3828 */ 3829 if (!WPACKET_put_bytes_u32(pkt, 3830 (s->hit && !SSL_IS_TLS13(s)) 3831 ? 0 : s->session->timeout)) { 3832 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CREATE_TICKET_PREQUEL, 3833 ERR_R_INTERNAL_ERROR); 3834 return 0; 3835 } 3836 3837 if (SSL_IS_TLS13(s)) { 3838 if (!WPACKET_put_bytes_u32(pkt, age_add) 3839 || !WPACKET_sub_memcpy_u8(pkt, tick_nonce, TICKET_NONCE_SIZE)) { 3840 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CREATE_TICKET_PREQUEL, 3841 ERR_R_INTERNAL_ERROR); 3842 return 0; 3843 } 3844 } 3845 3846 /* Start the sub-packet for the actual ticket data */ 3847 if (!WPACKET_start_sub_packet_u16(pkt)) { 3848 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CREATE_TICKET_PREQUEL, 3849 ERR_R_INTERNAL_ERROR); 3850 return 0; 3851 } 3852 3853 return 1; 3854} 3855 3856static int construct_stateless_ticket(SSL *s, WPACKET *pkt, uint32_t age_add, 3857 unsigned char *tick_nonce) 3858{ 3859 unsigned char *senc = NULL; 3860 EVP_CIPHER_CTX *ctx = NULL; 3861 HMAC_CTX *hctx = NULL; 3862 unsigned char *p, *encdata1, *encdata2, *macdata1, *macdata2; 3863 const unsigned char *const_p; 3864 int len, slen_full, slen, lenfinal; 3865 SSL_SESSION *sess; 3866 unsigned int hlen; 3867 SSL_CTX *tctx = s->session_ctx; 3868 unsigned char iv[EVP_MAX_IV_LENGTH]; 3869 unsigned char key_name[TLSEXT_KEYNAME_LENGTH]; 3870 int iv_len, ok = 0; 3871 size_t macoffset, macendoffset; 3872 3873 /* get session encoding length */ 3874 slen_full = i2d_SSL_SESSION(s->session, NULL); 3875 /* 3876 * Some length values are 16 bits, so forget it if session is too 3877 * long 3878 */ 3879 if (slen_full == 0 || slen_full > 0xFF00) { 3880 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET, 3881 ERR_R_INTERNAL_ERROR); 3882 goto err; 3883 } 3884 senc = OPENSSL_malloc(slen_full); 3885 if (senc == NULL) { 3886 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3887 SSL_F_CONSTRUCT_STATELESS_TICKET, ERR_R_MALLOC_FAILURE); 3888 goto err; 3889 } 3890 3891 ctx = EVP_CIPHER_CTX_new(); 3892 hctx = HMAC_CTX_new(); 3893 if (ctx == NULL || hctx == NULL) { 3894 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET, 3895 ERR_R_MALLOC_FAILURE); 3896 goto err; 3897 } 3898 3899 p = senc; 3900 if (!i2d_SSL_SESSION(s->session, &p)) { 3901 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET, 3902 ERR_R_INTERNAL_ERROR); 3903 goto err; 3904 } 3905 3906 /* 3907 * create a fresh copy (not shared with other threads) to clean up 3908 */ 3909 const_p = senc; 3910 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full); 3911 if (sess == NULL) { 3912 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET, 3913 ERR_R_INTERNAL_ERROR); 3914 goto err; 3915 } 3916 3917 slen = i2d_SSL_SESSION(sess, NULL); 3918 if (slen == 0 || slen > slen_full) { 3919 /* shouldn't ever happen */ 3920 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET, 3921 ERR_R_INTERNAL_ERROR); 3922 SSL_SESSION_free(sess); 3923 goto err; 3924 } 3925 p = senc; 3926 if (!i2d_SSL_SESSION(sess, &p)) { 3927 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET, 3928 ERR_R_INTERNAL_ERROR); 3929 SSL_SESSION_free(sess); 3930 goto err; 3931 } 3932 SSL_SESSION_free(sess); 3933 3934 /* 3935 * Initialize HMAC and cipher contexts. If callback present it does 3936 * all the work otherwise use generated values from parent ctx. 3937 */ 3938 if (tctx->ext.ticket_key_cb) { 3939 /* if 0 is returned, write an empty ticket */ 3940 int ret = tctx->ext.ticket_key_cb(s, key_name, iv, ctx, 3941 hctx, 1); 3942 3943 if (ret == 0) { 3944 3945 /* Put timeout and length */ 3946 if (!WPACKET_put_bytes_u32(pkt, 0) 3947 || !WPACKET_put_bytes_u16(pkt, 0)) { 3948 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3949 SSL_F_CONSTRUCT_STATELESS_TICKET, 3950 ERR_R_INTERNAL_ERROR); 3951 goto err; 3952 } 3953 OPENSSL_free(senc); 3954 EVP_CIPHER_CTX_free(ctx); 3955 HMAC_CTX_free(hctx); 3956 return 1; 3957 } 3958 if (ret < 0) { 3959 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET, 3960 SSL_R_CALLBACK_FAILED); 3961 goto err; 3962 } 3963 iv_len = EVP_CIPHER_CTX_iv_length(ctx); 3964 } else { 3965 const EVP_CIPHER *cipher = EVP_aes_256_cbc(); 3966 3967 iv_len = EVP_CIPHER_iv_length(cipher); 3968 if (RAND_bytes(iv, iv_len) <= 0 3969 || !EVP_EncryptInit_ex(ctx, cipher, NULL, 3970 tctx->ext.secure->tick_aes_key, iv) 3971 || !HMAC_Init_ex(hctx, tctx->ext.secure->tick_hmac_key, 3972 sizeof(tctx->ext.secure->tick_hmac_key), 3973 EVP_sha256(), NULL)) { 3974 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET, 3975 ERR_R_INTERNAL_ERROR); 3976 goto err; 3977 } 3978 memcpy(key_name, tctx->ext.tick_key_name, 3979 sizeof(tctx->ext.tick_key_name)); 3980 } 3981 3982 if (!create_ticket_prequel(s, pkt, age_add, tick_nonce)) { 3983 /* SSLfatal() already called */ 3984 goto err; 3985 } 3986 3987 if (!WPACKET_get_total_written(pkt, &macoffset) 3988 /* Output key name */ 3989 || !WPACKET_memcpy(pkt, key_name, sizeof(key_name)) 3990 /* output IV */ 3991 || !WPACKET_memcpy(pkt, iv, iv_len) 3992 || !WPACKET_reserve_bytes(pkt, slen + EVP_MAX_BLOCK_LENGTH, 3993 &encdata1) 3994 /* Encrypt session data */ 3995 || !EVP_EncryptUpdate(ctx, encdata1, &len, senc, slen) 3996 || !WPACKET_allocate_bytes(pkt, len, &encdata2) 3997 || encdata1 != encdata2 3998 || !EVP_EncryptFinal(ctx, encdata1 + len, &lenfinal) 3999 || !WPACKET_allocate_bytes(pkt, lenfinal, &encdata2) 4000 || encdata1 + len != encdata2 4001 || len + lenfinal > slen + EVP_MAX_BLOCK_LENGTH 4002 || !WPACKET_get_total_written(pkt, &macendoffset) 4003 || !HMAC_Update(hctx, 4004 (unsigned char *)s->init_buf->data + macoffset, 4005 macendoffset - macoffset) 4006 || !WPACKET_reserve_bytes(pkt, EVP_MAX_MD_SIZE, &macdata1) 4007 || !HMAC_Final(hctx, macdata1, &hlen) 4008 || hlen > EVP_MAX_MD_SIZE 4009 || !WPACKET_allocate_bytes(pkt, hlen, &macdata2) 4010 || macdata1 != macdata2) { 4011 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 4012 SSL_F_CONSTRUCT_STATELESS_TICKET, ERR_R_INTERNAL_ERROR); 4013 goto err; 4014 } 4015 4016 /* Close the sub-packet created by create_ticket_prequel() */ 4017 if (!WPACKET_close(pkt)) { 4018 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATELESS_TICKET, 4019 ERR_R_INTERNAL_ERROR); 4020 goto err; 4021 } 4022 4023 ok = 1; 4024 err: 4025 OPENSSL_free(senc); 4026 EVP_CIPHER_CTX_free(ctx); 4027 HMAC_CTX_free(hctx); 4028 return ok; 4029} 4030 4031static int construct_stateful_ticket(SSL *s, WPACKET *pkt, uint32_t age_add, 4032 unsigned char *tick_nonce) 4033{ 4034 if (!create_ticket_prequel(s, pkt, age_add, tick_nonce)) { 4035 /* SSLfatal() already called */ 4036 return 0; 4037 } 4038 4039 if (!WPACKET_memcpy(pkt, s->session->session_id, 4040 s->session->session_id_length) 4041 || !WPACKET_close(pkt)) { 4042 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_CONSTRUCT_STATEFUL_TICKET, 4043 ERR_R_INTERNAL_ERROR); 4044 return 0; 4045 } 4046 4047 return 1; 4048} 4049 4050int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt) 4051{ 4052 SSL_CTX *tctx = s->session_ctx; 4053 unsigned char tick_nonce[TICKET_NONCE_SIZE]; 4054 union { 4055 unsigned char age_add_c[sizeof(uint32_t)]; 4056 uint32_t age_add; 4057 } age_add_u; 4058 4059 age_add_u.age_add = 0; 4060 4061 if (SSL_IS_TLS13(s)) { 4062 size_t i, hashlen; 4063 uint64_t nonce; 4064 static const unsigned char nonce_label[] = "resumption"; 4065 const EVP_MD *md = ssl_handshake_md(s); 4066 int hashleni = EVP_MD_size(md); 4067 4068 /* Ensure cast to size_t is safe */ 4069 if (!ossl_assert(hashleni >= 0)) { 4070 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 4071 SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET, 4072 ERR_R_INTERNAL_ERROR); 4073 goto err; 4074 } 4075 hashlen = (size_t)hashleni; 4076 4077 /* 4078 * If we already sent one NewSessionTicket, or we resumed then 4079 * s->session may already be in a cache and so we must not modify it. 4080 * Instead we need to take a copy of it and modify that. 4081 */ 4082 if (s->sent_tickets != 0 || s->hit) { 4083 SSL_SESSION *new_sess = ssl_session_dup(s->session, 0); 4084 4085 if (new_sess == NULL) { 4086 /* SSLfatal already called */ 4087 goto err; 4088 } 4089 4090 SSL_SESSION_free(s->session); 4091 s->session = new_sess; 4092 } 4093 4094 if (!ssl_generate_session_id(s, s->session)) { 4095 /* SSLfatal() already called */ 4096 goto err; 4097 } 4098 if (RAND_bytes(age_add_u.age_add_c, sizeof(age_add_u)) <= 0) { 4099 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 4100 SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET, 4101 ERR_R_INTERNAL_ERROR); 4102 goto err; 4103 } 4104 s->session->ext.tick_age_add = age_add_u.age_add; 4105 4106 nonce = s->next_ticket_nonce; 4107 for (i = TICKET_NONCE_SIZE; i > 0; i--) { 4108 tick_nonce[i - 1] = (unsigned char)(nonce & 0xff); 4109 nonce >>= 8; 4110 } 4111 4112 if (!tls13_hkdf_expand(s, md, s->resumption_master_secret, 4113 nonce_label, 4114 sizeof(nonce_label) - 1, 4115 tick_nonce, 4116 TICKET_NONCE_SIZE, 4117 s->session->master_key, 4118 hashlen, 1)) { 4119 /* SSLfatal() already called */ 4120 goto err; 4121 } 4122 s->session->master_key_length = hashlen; 4123 4124 s->session->time = (long)time(NULL); 4125 if (s->s3->alpn_selected != NULL) { 4126 OPENSSL_free(s->session->ext.alpn_selected); 4127 s->session->ext.alpn_selected = 4128 OPENSSL_memdup(s->s3->alpn_selected, s->s3->alpn_selected_len); 4129 if (s->session->ext.alpn_selected == NULL) { 4130 s->session->ext.alpn_selected_len = 0; 4131 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 4132 SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET, 4133 ERR_R_MALLOC_FAILURE); 4134 goto err; 4135 } 4136 s->session->ext.alpn_selected_len = s->s3->alpn_selected_len; 4137 } 4138 s->session->ext.max_early_data = s->max_early_data; 4139 } 4140 4141 if (tctx->generate_ticket_cb != NULL && 4142 tctx->generate_ticket_cb(s, tctx->ticket_cb_data) == 0) 4143 goto err; 4144 4145 /* 4146 * If we are using anti-replay protection then we behave as if 4147 * SSL_OP_NO_TICKET is set - we are caching tickets anyway so there 4148 * is no point in using full stateless tickets. 4149 */ 4150 if (SSL_IS_TLS13(s) 4151 && ((s->options & SSL_OP_NO_TICKET) != 0 4152 || (s->max_early_data > 0 4153 && (s->options & SSL_OP_NO_ANTI_REPLAY) == 0))) { 4154 if (!construct_stateful_ticket(s, pkt, age_add_u.age_add, tick_nonce)) { 4155 /* SSLfatal() already called */ 4156 goto err; 4157 } 4158 } else if (!construct_stateless_ticket(s, pkt, age_add_u.age_add, 4159 tick_nonce)) { 4160 /* SSLfatal() already called */ 4161 goto err; 4162 } 4163 4164 if (SSL_IS_TLS13(s)) { 4165 if (!tls_construct_extensions(s, pkt, 4166 SSL_EXT_TLS1_3_NEW_SESSION_TICKET, 4167 NULL, 0)) { 4168 /* SSLfatal() already called */ 4169 goto err; 4170 } 4171 /* 4172 * Increment both |sent_tickets| and |next_ticket_nonce|. |sent_tickets| 4173 * gets reset to 0 if we send more tickets following a post-handshake 4174 * auth, but |next_ticket_nonce| does not. 4175 */ 4176 s->sent_tickets++; 4177 s->next_ticket_nonce++; 4178 ssl_update_cache(s, SSL_SESS_CACHE_SERVER); 4179 } 4180 4181 return 1; 4182 err: 4183 return 0; 4184} 4185 4186/* 4187 * In TLSv1.3 this is called from the extensions code, otherwise it is used to 4188 * create a separate message. Returns 1 on success or 0 on failure. 4189 */ 4190int tls_construct_cert_status_body(SSL *s, WPACKET *pkt) 4191{ 4192 if (!WPACKET_put_bytes_u8(pkt, s->ext.status_type) 4193 || !WPACKET_sub_memcpy_u24(pkt, s->ext.ocsp.resp, 4194 s->ext.ocsp.resp_len)) { 4195 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_STATUS_BODY, 4196 ERR_R_INTERNAL_ERROR); 4197 return 0; 4198 } 4199 4200 return 1; 4201} 4202 4203int tls_construct_cert_status(SSL *s, WPACKET *pkt) 4204{ 4205 if (!tls_construct_cert_status_body(s, pkt)) { 4206 /* SSLfatal() already called */ 4207 return 0; 4208 } 4209 4210 return 1; 4211} 4212 4213#ifndef OPENSSL_NO_NEXTPROTONEG 4214/* 4215 * tls_process_next_proto reads a Next Protocol Negotiation handshake message. 4216 * It sets the next_proto member in s if found 4217 */ 4218MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt) 4219{ 4220 PACKET next_proto, padding; 4221 size_t next_proto_len; 4222 4223 /*- 4224 * The payload looks like: 4225 * uint8 proto_len; 4226 * uint8 proto[proto_len]; 4227 * uint8 padding_len; 4228 * uint8 padding[padding_len]; 4229 */ 4230 if (!PACKET_get_length_prefixed_1(pkt, &next_proto) 4231 || !PACKET_get_length_prefixed_1(pkt, &padding) 4232 || PACKET_remaining(pkt) > 0) { 4233 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_NEXT_PROTO, 4234 SSL_R_LENGTH_MISMATCH); 4235 return MSG_PROCESS_ERROR; 4236 } 4237 4238 if (!PACKET_memdup(&next_proto, &s->ext.npn, &next_proto_len)) { 4239 s->ext.npn_len = 0; 4240 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_NEXT_PROTO, 4241 ERR_R_INTERNAL_ERROR); 4242 return MSG_PROCESS_ERROR; 4243 } 4244 4245 s->ext.npn_len = (unsigned char)next_proto_len; 4246 4247 return MSG_PROCESS_CONTINUE_READING; 4248} 4249#endif 4250 4251static int tls_construct_encrypted_extensions(SSL *s, WPACKET *pkt) 4252{ 4253 if (!tls_construct_extensions(s, pkt, SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, 4254 NULL, 0)) { 4255 /* SSLfatal() already called */ 4256 return 0; 4257 } 4258 4259 return 1; 4260} 4261 4262MSG_PROCESS_RETURN tls_process_end_of_early_data(SSL *s, PACKET *pkt) 4263{ 4264 if (PACKET_remaining(pkt) != 0) { 4265 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_END_OF_EARLY_DATA, 4266 SSL_R_LENGTH_MISMATCH); 4267 return MSG_PROCESS_ERROR; 4268 } 4269 4270 if (s->early_data_state != SSL_EARLY_DATA_READING 4271 && s->early_data_state != SSL_EARLY_DATA_READ_RETRY) { 4272 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_END_OF_EARLY_DATA, 4273 ERR_R_INTERNAL_ERROR); 4274 return MSG_PROCESS_ERROR; 4275 } 4276 4277 /* 4278 * EndOfEarlyData signals a key change so the end of the message must be on 4279 * a record boundary. 4280 */ 4281 if (RECORD_LAYER_processed_read_pending(&s->rlayer)) { 4282 SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, 4283 SSL_F_TLS_PROCESS_END_OF_EARLY_DATA, 4284 SSL_R_NOT_ON_RECORD_BOUNDARY); 4285 return MSG_PROCESS_ERROR; 4286 } 4287 4288 s->early_data_state = SSL_EARLY_DATA_FINISHED_READING; 4289 if (!s->method->ssl3_enc->change_cipher_state(s, 4290 SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_SERVER_READ)) { 4291 /* SSLfatal() already called */ 4292 return MSG_PROCESS_ERROR; 4293 } 4294 4295 return MSG_PROCESS_CONTINUE_READING; 4296} 4297