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 <time.h> 14 #include <assert.h> 15 #include "../ssl_local.h" 16 #include "statem_local.h" 17 #include <openssl/buffer.h> 18 #include <openssl/rand.h> 19 #include <openssl/objects.h> 20 #include <openssl/evp.h> 21 #include <openssl/md5.h> 22 #include <openssl/dh.h> 23 #include <openssl/bn.h> 24 #include <openssl/engine.h> 25 #include <internal/cryptlib.h> 26 27 static MSG_PROCESS_RETURN tls_process_as_hello_retry_request(SSL *s, PACKET *pkt); 28 static MSG_PROCESS_RETURN tls_process_encrypted_extensions(SSL *s, PACKET *pkt); 29 30 static ossl_inline int cert_req_allowed(SSL *s); 31 static int key_exchange_expected(SSL *s); 32 static int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk, 33 WPACKET *pkt); 34 35 /* 36 * Is a CertificateRequest message allowed at the moment or not? 37 * 38 * Return values are: 39 * 1: Yes 40 * 0: No 41 */ 42 static ossl_inline int cert_req_allowed(SSL *s) 43 { 44 /* TLS does not like anon-DH with client cert */ 45 if ((s->version > SSL3_VERSION 46 && (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)) 47 || (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aSRP | SSL_aPSK))) 48 return 0; 49 50 return 1; 51 } 52 53 /* 54 * Should we expect the ServerKeyExchange message or not? 55 * 56 * Return values are: 57 * 1: Yes 58 * 0: No 59 */ 60 static int key_exchange_expected(SSL *s) 61 { 62 long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 63 64 /* 65 * Can't skip server key exchange if this is an ephemeral 66 * ciphersuite or for SRP 67 */ 68 if (alg_k & (SSL_kDHE | SSL_kECDHE | SSL_kDHEPSK | SSL_kECDHEPSK 69 | SSL_kSRP)) { 70 return 1; 71 } 72 73 return 0; 74 } 75 76 /* 77 * ossl_statem_client_read_transition() encapsulates the logic for the allowed 78 * handshake state transitions when a TLS1.3 client is reading messages from the 79 * server. The message type that the server has sent is provided in |mt|. The 80 * current state is in |s->statem.hand_state|. 81 * 82 * Return values are 1 for success (transition allowed) and 0 on error 83 * (transition not allowed) 84 */ 85 static int ossl_statem_client13_read_transition(SSL *s, int mt) 86 { 87 OSSL_STATEM *st = &s->statem; 88 89 /* 90 * Note: There is no case for TLS_ST_CW_CLNT_HELLO, because we haven't 91 * yet negotiated TLSv1.3 at that point so that is handled by 92 * ossl_statem_client_read_transition() 93 */ 94 95 switch (st->hand_state) { 96 default: 97 break; 98 99 case TLS_ST_CW_CLNT_HELLO: 100 /* 101 * This must a ClientHello following a HelloRetryRequest, so the only 102 * thing we can get now is a ServerHello. 103 */ 104 if (mt == SSL3_MT_SERVER_HELLO) { 105 st->hand_state = TLS_ST_CR_SRVR_HELLO; 106 return 1; 107 } 108 break; 109 110 case TLS_ST_CR_SRVR_HELLO: 111 if (mt == SSL3_MT_ENCRYPTED_EXTENSIONS) { 112 st->hand_state = TLS_ST_CR_ENCRYPTED_EXTENSIONS; 113 return 1; 114 } 115 break; 116 117 case TLS_ST_CR_ENCRYPTED_EXTENSIONS: 118 if (s->hit) { 119 if (mt == SSL3_MT_FINISHED) { 120 st->hand_state = TLS_ST_CR_FINISHED; 121 return 1; 122 } 123 } else { 124 if (mt == SSL3_MT_CERTIFICATE_REQUEST) { 125 st->hand_state = TLS_ST_CR_CERT_REQ; 126 return 1; 127 } 128 if (mt == SSL3_MT_CERTIFICATE) { 129 st->hand_state = TLS_ST_CR_CERT; 130 return 1; 131 } 132 } 133 break; 134 135 case TLS_ST_CR_CERT_REQ: 136 if (mt == SSL3_MT_CERTIFICATE) { 137 st->hand_state = TLS_ST_CR_CERT; 138 return 1; 139 } 140 break; 141 142 case TLS_ST_CR_CERT: 143 if (mt == SSL3_MT_CERTIFICATE_VERIFY) { 144 st->hand_state = TLS_ST_CR_CERT_VRFY; 145 return 1; 146 } 147 break; 148 149 case TLS_ST_CR_CERT_VRFY: 150 if (mt == SSL3_MT_FINISHED) { 151 st->hand_state = TLS_ST_CR_FINISHED; 152 return 1; 153 } 154 break; 155 156 case TLS_ST_OK: 157 if (mt == SSL3_MT_NEWSESSION_TICKET) { 158 st->hand_state = TLS_ST_CR_SESSION_TICKET; 159 return 1; 160 } 161 if (mt == SSL3_MT_KEY_UPDATE) { 162 st->hand_state = TLS_ST_CR_KEY_UPDATE; 163 return 1; 164 } 165 if (mt == SSL3_MT_CERTIFICATE_REQUEST) { 166 #if DTLS_MAX_VERSION != DTLS1_2_VERSION 167 # error TODO(DTLS1.3): Restore digest for PHA before adding message. 168 #endif 169 if (!SSL_IS_DTLS(s) && s->post_handshake_auth == SSL_PHA_EXT_SENT) { 170 s->post_handshake_auth = SSL_PHA_REQUESTED; 171 /* 172 * In TLS, this is called before the message is added to the 173 * digest. In DTLS, this is expected to be called after adding 174 * to the digest. Either move the digest restore, or add the 175 * message here after the swap, or do it after the clientFinished? 176 */ 177 if (!tls13_restore_handshake_digest_for_pha(s)) { 178 /* SSLfatal() already called */ 179 return 0; 180 } 181 st->hand_state = TLS_ST_CR_CERT_REQ; 182 return 1; 183 } 184 } 185 break; 186 } 187 188 /* No valid transition found */ 189 return 0; 190 } 191 192 /* 193 * ossl_statem_client_read_transition() encapsulates the logic for the allowed 194 * handshake state transitions when the client is reading messages from the 195 * server. The message type that the server has sent is provided in |mt|. The 196 * current state is in |s->statem.hand_state|. 197 * 198 * Return values are 1 for success (transition allowed) and 0 on error 199 * (transition not allowed) 200 */ 201 int ossl_statem_client_read_transition(SSL *s, int mt) 202 { 203 OSSL_STATEM *st = &s->statem; 204 int ske_expected; 205 206 /* 207 * Note that after writing the first ClientHello we don't know what version 208 * we are going to negotiate yet, so we don't take this branch until later. 209 */ 210 if (SSL_IS_TLS13(s)) { 211 if (!ossl_statem_client13_read_transition(s, mt)) 212 goto err; 213 return 1; 214 } 215 216 switch (st->hand_state) { 217 default: 218 break; 219 220 case TLS_ST_CW_CLNT_HELLO: 221 if (mt == SSL3_MT_SERVER_HELLO) { 222 st->hand_state = TLS_ST_CR_SRVR_HELLO; 223 return 1; 224 } 225 226 if (SSL_IS_DTLS(s)) { 227 if (mt == DTLS1_MT_HELLO_VERIFY_REQUEST) { 228 st->hand_state = DTLS_ST_CR_HELLO_VERIFY_REQUEST; 229 return 1; 230 } 231 } 232 break; 233 234 case TLS_ST_EARLY_DATA: 235 /* 236 * We've not actually selected TLSv1.3 yet, but we have sent early 237 * data. The only thing allowed now is a ServerHello or a 238 * HelloRetryRequest. 239 */ 240 if (mt == SSL3_MT_SERVER_HELLO) { 241 st->hand_state = TLS_ST_CR_SRVR_HELLO; 242 return 1; 243 } 244 break; 245 246 case TLS_ST_CR_SRVR_HELLO: 247 if (s->hit) { 248 if (s->ext.ticket_expected) { 249 if (mt == SSL3_MT_NEWSESSION_TICKET) { 250 st->hand_state = TLS_ST_CR_SESSION_TICKET; 251 return 1; 252 } 253 } else if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { 254 st->hand_state = TLS_ST_CR_CHANGE; 255 return 1; 256 } 257 } else { 258 if (SSL_IS_DTLS(s) && mt == DTLS1_MT_HELLO_VERIFY_REQUEST) { 259 st->hand_state = DTLS_ST_CR_HELLO_VERIFY_REQUEST; 260 return 1; 261 } else if (s->version >= TLS1_VERSION 262 && s->ext.session_secret_cb != NULL 263 && s->session->ext.tick != NULL 264 && mt == SSL3_MT_CHANGE_CIPHER_SPEC) { 265 /* 266 * Normally, we can tell if the server is resuming the session 267 * from the session ID. EAP-FAST (RFC 4851), however, relies on 268 * the next server message after the ServerHello to determine if 269 * the server is resuming. 270 */ 271 s->hit = 1; 272 st->hand_state = TLS_ST_CR_CHANGE; 273 return 1; 274 } else if (!(s->s3->tmp.new_cipher->algorithm_auth 275 & (SSL_aNULL | SSL_aSRP | SSL_aPSK))) { 276 if (mt == SSL3_MT_CERTIFICATE) { 277 st->hand_state = TLS_ST_CR_CERT; 278 return 1; 279 } 280 } else { 281 ske_expected = key_exchange_expected(s); 282 /* SKE is optional for some PSK ciphersuites */ 283 if (ske_expected 284 || ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK) 285 && mt == SSL3_MT_SERVER_KEY_EXCHANGE)) { 286 if (mt == SSL3_MT_SERVER_KEY_EXCHANGE) { 287 st->hand_state = TLS_ST_CR_KEY_EXCH; 288 return 1; 289 } 290 } else if (mt == SSL3_MT_CERTIFICATE_REQUEST 291 && cert_req_allowed(s)) { 292 st->hand_state = TLS_ST_CR_CERT_REQ; 293 return 1; 294 } else if (mt == SSL3_MT_SERVER_DONE) { 295 st->hand_state = TLS_ST_CR_SRVR_DONE; 296 return 1; 297 } 298 } 299 } 300 break; 301 302 case TLS_ST_CR_CERT: 303 /* 304 * The CertificateStatus message is optional even if 305 * |ext.status_expected| is set 306 */ 307 if (s->ext.status_expected && mt == SSL3_MT_CERTIFICATE_STATUS) { 308 st->hand_state = TLS_ST_CR_CERT_STATUS; 309 return 1; 310 } 311 /* Fall through */ 312 313 case TLS_ST_CR_CERT_STATUS: 314 ske_expected = key_exchange_expected(s); 315 /* SKE is optional for some PSK ciphersuites */ 316 if (ske_expected || ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK) 317 && mt == SSL3_MT_SERVER_KEY_EXCHANGE)) { 318 if (mt == SSL3_MT_SERVER_KEY_EXCHANGE) { 319 st->hand_state = TLS_ST_CR_KEY_EXCH; 320 return 1; 321 } 322 goto err; 323 } 324 /* Fall through */ 325 326 case TLS_ST_CR_KEY_EXCH: 327 if (mt == SSL3_MT_CERTIFICATE_REQUEST) { 328 if (cert_req_allowed(s)) { 329 st->hand_state = TLS_ST_CR_CERT_REQ; 330 return 1; 331 } 332 goto err; 333 } 334 /* Fall through */ 335 336 case TLS_ST_CR_CERT_REQ: 337 if (mt == SSL3_MT_SERVER_DONE) { 338 st->hand_state = TLS_ST_CR_SRVR_DONE; 339 return 1; 340 } 341 break; 342 343 case TLS_ST_CW_FINISHED: 344 if (s->ext.ticket_expected) { 345 if (mt == SSL3_MT_NEWSESSION_TICKET) { 346 st->hand_state = TLS_ST_CR_SESSION_TICKET; 347 return 1; 348 } 349 } else if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { 350 st->hand_state = TLS_ST_CR_CHANGE; 351 return 1; 352 } 353 break; 354 355 case TLS_ST_CR_SESSION_TICKET: 356 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) { 357 st->hand_state = TLS_ST_CR_CHANGE; 358 return 1; 359 } 360 break; 361 362 case TLS_ST_CR_CHANGE: 363 if (mt == SSL3_MT_FINISHED) { 364 st->hand_state = TLS_ST_CR_FINISHED; 365 return 1; 366 } 367 break; 368 369 case TLS_ST_OK: 370 if (mt == SSL3_MT_HELLO_REQUEST) { 371 st->hand_state = TLS_ST_CR_HELLO_REQ; 372 return 1; 373 } 374 break; 375 } 376 377 err: 378 /* No valid transition found */ 379 if (SSL_IS_DTLS(s) && mt == SSL3_MT_CHANGE_CIPHER_SPEC) { 380 BIO *rbio; 381 382 /* 383 * CCS messages don't have a message sequence number so this is probably 384 * because of an out-of-order CCS. We'll just drop it. 385 */ 386 s->init_num = 0; 387 s->rwstate = SSL_READING; 388 rbio = SSL_get_rbio(s); 389 BIO_clear_retry_flags(rbio); 390 BIO_set_retry_read(rbio); 391 return 0; 392 } 393 SSLfatal(s, SSL3_AD_UNEXPECTED_MESSAGE, 394 SSL_F_OSSL_STATEM_CLIENT_READ_TRANSITION, 395 SSL_R_UNEXPECTED_MESSAGE); 396 return 0; 397 } 398 399 /* 400 * ossl_statem_client13_write_transition() works out what handshake state to 401 * move to next when the TLSv1.3 client is writing messages to be sent to the 402 * server. 403 */ 404 static WRITE_TRAN ossl_statem_client13_write_transition(SSL *s) 405 { 406 OSSL_STATEM *st = &s->statem; 407 408 /* 409 * Note: There are no cases for TLS_ST_BEFORE because we haven't negotiated 410 * TLSv1.3 yet at that point. They are handled by 411 * ossl_statem_client_write_transition(). 412 */ 413 switch (st->hand_state) { 414 default: 415 /* Shouldn't happen */ 416 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 417 SSL_F_OSSL_STATEM_CLIENT13_WRITE_TRANSITION, 418 ERR_R_INTERNAL_ERROR); 419 return WRITE_TRAN_ERROR; 420 421 case TLS_ST_CR_CERT_REQ: 422 if (s->post_handshake_auth == SSL_PHA_REQUESTED) { 423 st->hand_state = TLS_ST_CW_CERT; 424 return WRITE_TRAN_CONTINUE; 425 } 426 /* 427 * We should only get here if we received a CertificateRequest after 428 * we already sent close_notify 429 */ 430 if (!ossl_assert((s->shutdown & SSL_SENT_SHUTDOWN) != 0)) { 431 /* Shouldn't happen - same as default case */ 432 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 433 SSL_F_OSSL_STATEM_CLIENT13_WRITE_TRANSITION, 434 ERR_R_INTERNAL_ERROR); 435 return WRITE_TRAN_ERROR; 436 } 437 st->hand_state = TLS_ST_OK; 438 return WRITE_TRAN_CONTINUE; 439 440 case TLS_ST_CR_FINISHED: 441 if (s->early_data_state == SSL_EARLY_DATA_WRITE_RETRY 442 || s->early_data_state == SSL_EARLY_DATA_FINISHED_WRITING) 443 st->hand_state = TLS_ST_PENDING_EARLY_DATA_END; 444 else if ((s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) != 0 445 && s->hello_retry_request == SSL_HRR_NONE) 446 st->hand_state = TLS_ST_CW_CHANGE; 447 else 448 st->hand_state = (s->s3->tmp.cert_req != 0) ? TLS_ST_CW_CERT 449 : TLS_ST_CW_FINISHED; 450 return WRITE_TRAN_CONTINUE; 451 452 case TLS_ST_PENDING_EARLY_DATA_END: 453 if (s->ext.early_data == SSL_EARLY_DATA_ACCEPTED) { 454 st->hand_state = TLS_ST_CW_END_OF_EARLY_DATA; 455 return WRITE_TRAN_CONTINUE; 456 } 457 /* Fall through */ 458 459 case TLS_ST_CW_END_OF_EARLY_DATA: 460 case TLS_ST_CW_CHANGE: 461 st->hand_state = (s->s3->tmp.cert_req != 0) ? TLS_ST_CW_CERT 462 : TLS_ST_CW_FINISHED; 463 return WRITE_TRAN_CONTINUE; 464 465 case TLS_ST_CW_CERT: 466 /* If a non-empty Certificate we also send CertificateVerify */ 467 st->hand_state = (s->s3->tmp.cert_req == 1) ? TLS_ST_CW_CERT_VRFY 468 : TLS_ST_CW_FINISHED; 469 return WRITE_TRAN_CONTINUE; 470 471 case TLS_ST_CW_CERT_VRFY: 472 st->hand_state = TLS_ST_CW_FINISHED; 473 return WRITE_TRAN_CONTINUE; 474 475 case TLS_ST_CR_KEY_UPDATE: 476 case TLS_ST_CW_KEY_UPDATE: 477 case TLS_ST_CR_SESSION_TICKET: 478 case TLS_ST_CW_FINISHED: 479 st->hand_state = TLS_ST_OK; 480 return WRITE_TRAN_CONTINUE; 481 482 case TLS_ST_OK: 483 if (s->key_update != SSL_KEY_UPDATE_NONE) { 484 st->hand_state = TLS_ST_CW_KEY_UPDATE; 485 return WRITE_TRAN_CONTINUE; 486 } 487 488 /* Try to read from the server instead */ 489 return WRITE_TRAN_FINISHED; 490 } 491 } 492 493 /* 494 * ossl_statem_client_write_transition() works out what handshake state to 495 * move to next when the client is writing messages to be sent to the server. 496 */ 497 WRITE_TRAN ossl_statem_client_write_transition(SSL *s) 498 { 499 OSSL_STATEM *st = &s->statem; 500 501 /* 502 * Note that immediately before/after a ClientHello we don't know what 503 * version we are going to negotiate yet, so we don't take this branch until 504 * later 505 */ 506 if (SSL_IS_TLS13(s)) 507 return ossl_statem_client13_write_transition(s); 508 509 switch (st->hand_state) { 510 default: 511 /* Shouldn't happen */ 512 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 513 SSL_F_OSSL_STATEM_CLIENT_WRITE_TRANSITION, 514 ERR_R_INTERNAL_ERROR); 515 return WRITE_TRAN_ERROR; 516 517 case TLS_ST_OK: 518 if (!s->renegotiate) { 519 /* 520 * We haven't requested a renegotiation ourselves so we must have 521 * received a message from the server. Better read it. 522 */ 523 return WRITE_TRAN_FINISHED; 524 } 525 /* Renegotiation */ 526 /* fall thru */ 527 case TLS_ST_BEFORE: 528 st->hand_state = TLS_ST_CW_CLNT_HELLO; 529 return WRITE_TRAN_CONTINUE; 530 531 case TLS_ST_CW_CLNT_HELLO: 532 if (s->early_data_state == SSL_EARLY_DATA_CONNECTING) { 533 /* 534 * We are assuming this is a TLSv1.3 connection, although we haven't 535 * actually selected a version yet. 536 */ 537 if ((s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) != 0) 538 st->hand_state = TLS_ST_CW_CHANGE; 539 else 540 st->hand_state = TLS_ST_EARLY_DATA; 541 return WRITE_TRAN_CONTINUE; 542 } 543 /* 544 * No transition at the end of writing because we don't know what 545 * we will be sent 546 */ 547 return WRITE_TRAN_FINISHED; 548 549 case TLS_ST_CR_SRVR_HELLO: 550 /* 551 * We only get here in TLSv1.3. We just received an HRR, so issue a 552 * CCS unless middlebox compat mode is off, or we already issued one 553 * because we did early data. 554 */ 555 if ((s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) != 0 556 && s->early_data_state != SSL_EARLY_DATA_FINISHED_WRITING) 557 st->hand_state = TLS_ST_CW_CHANGE; 558 else 559 st->hand_state = TLS_ST_CW_CLNT_HELLO; 560 return WRITE_TRAN_CONTINUE; 561 562 case TLS_ST_EARLY_DATA: 563 return WRITE_TRAN_FINISHED; 564 565 case DTLS_ST_CR_HELLO_VERIFY_REQUEST: 566 st->hand_state = TLS_ST_CW_CLNT_HELLO; 567 return WRITE_TRAN_CONTINUE; 568 569 case TLS_ST_CR_SRVR_DONE: 570 if (s->s3->tmp.cert_req) 571 st->hand_state = TLS_ST_CW_CERT; 572 else 573 st->hand_state = TLS_ST_CW_KEY_EXCH; 574 return WRITE_TRAN_CONTINUE; 575 576 case TLS_ST_CW_CERT: 577 st->hand_state = TLS_ST_CW_KEY_EXCH; 578 return WRITE_TRAN_CONTINUE; 579 580 case TLS_ST_CW_KEY_EXCH: 581 /* 582 * For TLS, cert_req is set to 2, so a cert chain of nothing is 583 * sent, but no verify packet is sent 584 */ 585 /* 586 * XXX: For now, we do not support client authentication in ECDH 587 * cipher suites with ECDH (rather than ECDSA) certificates. We 588 * need to skip the certificate verify message when client's 589 * ECDH public key is sent inside the client certificate. 590 */ 591 if (s->s3->tmp.cert_req == 1) { 592 st->hand_state = TLS_ST_CW_CERT_VRFY; 593 } else { 594 st->hand_state = TLS_ST_CW_CHANGE; 595 } 596 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 597 st->hand_state = TLS_ST_CW_CHANGE; 598 } 599 return WRITE_TRAN_CONTINUE; 600 601 case TLS_ST_CW_CERT_VRFY: 602 st->hand_state = TLS_ST_CW_CHANGE; 603 return WRITE_TRAN_CONTINUE; 604 605 case TLS_ST_CW_CHANGE: 606 if (s->hello_retry_request == SSL_HRR_PENDING) { 607 st->hand_state = TLS_ST_CW_CLNT_HELLO; 608 } else if (s->early_data_state == SSL_EARLY_DATA_CONNECTING) { 609 st->hand_state = TLS_ST_EARLY_DATA; 610 } else { 611 #if defined(OPENSSL_NO_NEXTPROTONEG) 612 st->hand_state = TLS_ST_CW_FINISHED; 613 #else 614 if (!SSL_IS_DTLS(s) && s->s3->npn_seen) 615 st->hand_state = TLS_ST_CW_NEXT_PROTO; 616 else 617 st->hand_state = TLS_ST_CW_FINISHED; 618 #endif 619 } 620 return WRITE_TRAN_CONTINUE; 621 622 #if !defined(OPENSSL_NO_NEXTPROTONEG) 623 case TLS_ST_CW_NEXT_PROTO: 624 st->hand_state = TLS_ST_CW_FINISHED; 625 return WRITE_TRAN_CONTINUE; 626 #endif 627 628 case TLS_ST_CW_FINISHED: 629 if (s->hit) { 630 st->hand_state = TLS_ST_OK; 631 return WRITE_TRAN_CONTINUE; 632 } else { 633 return WRITE_TRAN_FINISHED; 634 } 635 636 case TLS_ST_CR_FINISHED: 637 if (s->hit) { 638 st->hand_state = TLS_ST_CW_CHANGE; 639 return WRITE_TRAN_CONTINUE; 640 } else { 641 st->hand_state = TLS_ST_OK; 642 return WRITE_TRAN_CONTINUE; 643 } 644 645 case TLS_ST_CR_HELLO_REQ: 646 /* 647 * If we can renegotiate now then do so, otherwise wait for a more 648 * convenient time. 649 */ 650 if (ssl3_renegotiate_check(s, 1)) { 651 if (!tls_setup_handshake(s)) { 652 /* SSLfatal() already called */ 653 return WRITE_TRAN_ERROR; 654 } 655 st->hand_state = TLS_ST_CW_CLNT_HELLO; 656 return WRITE_TRAN_CONTINUE; 657 } 658 st->hand_state = TLS_ST_OK; 659 return WRITE_TRAN_CONTINUE; 660 } 661 } 662 663 /* 664 * Perform any pre work that needs to be done prior to sending a message from 665 * the client to the server. 666 */ 667 WORK_STATE ossl_statem_client_pre_work(SSL *s, WORK_STATE wst) 668 { 669 OSSL_STATEM *st = &s->statem; 670 671 switch (st->hand_state) { 672 default: 673 /* No pre work to be done */ 674 break; 675 676 case TLS_ST_CW_CLNT_HELLO: 677 s->shutdown = 0; 678 if (SSL_IS_DTLS(s)) { 679 /* every DTLS ClientHello resets Finished MAC */ 680 if (!ssl3_init_finished_mac(s)) { 681 /* SSLfatal() already called */ 682 return WORK_ERROR; 683 } 684 } 685 break; 686 687 case TLS_ST_CW_CHANGE: 688 if (SSL_IS_DTLS(s)) { 689 if (s->hit) { 690 /* 691 * We're into the last flight so we don't retransmit these 692 * messages unless we need to. 693 */ 694 st->use_timer = 0; 695 } 696 #ifndef OPENSSL_NO_SCTP 697 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 698 /* Calls SSLfatal() as required */ 699 return dtls_wait_for_dry(s); 700 } 701 #endif 702 } 703 break; 704 705 case TLS_ST_PENDING_EARLY_DATA_END: 706 /* 707 * If we've been called by SSL_do_handshake()/SSL_write(), or we did not 708 * attempt to write early data before calling SSL_read() then we press 709 * on with the handshake. Otherwise we pause here. 710 */ 711 if (s->early_data_state == SSL_EARLY_DATA_FINISHED_WRITING 712 || s->early_data_state == SSL_EARLY_DATA_NONE) 713 return WORK_FINISHED_CONTINUE; 714 /* Fall through */ 715 716 case TLS_ST_EARLY_DATA: 717 return tls_finish_handshake(s, wst, 0, 1); 718 719 case TLS_ST_OK: 720 /* Calls SSLfatal() as required */ 721 return tls_finish_handshake(s, wst, 1, 1); 722 } 723 724 return WORK_FINISHED_CONTINUE; 725 } 726 727 /* 728 * Perform any work that needs to be done after sending a message from the 729 * client to the server. 730 */ 731 WORK_STATE ossl_statem_client_post_work(SSL *s, WORK_STATE wst) 732 { 733 OSSL_STATEM *st = &s->statem; 734 735 s->init_num = 0; 736 737 switch (st->hand_state) { 738 default: 739 /* No post work to be done */ 740 break; 741 742 case TLS_ST_CW_CLNT_HELLO: 743 if (s->early_data_state == SSL_EARLY_DATA_CONNECTING 744 && s->max_early_data > 0) { 745 /* 746 * We haven't selected TLSv1.3 yet so we don't call the change 747 * cipher state function associated with the SSL_METHOD. Instead 748 * we call tls13_change_cipher_state() directly. 749 */ 750 if ((s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) == 0) { 751 if (!tls13_change_cipher_state(s, 752 SSL3_CC_EARLY | SSL3_CHANGE_CIPHER_CLIENT_WRITE)) { 753 /* SSLfatal() already called */ 754 return WORK_ERROR; 755 } 756 } 757 /* else we're in compat mode so we delay flushing until after CCS */ 758 } else if (!statem_flush(s)) { 759 return WORK_MORE_A; 760 } 761 762 if (SSL_IS_DTLS(s)) { 763 /* Treat the next message as the first packet */ 764 s->first_packet = 1; 765 } 766 break; 767 768 case TLS_ST_CW_END_OF_EARLY_DATA: 769 /* 770 * We set the enc_write_ctx back to NULL because we may end up writing 771 * in cleartext again if we get a HelloRetryRequest from the server. 772 */ 773 EVP_CIPHER_CTX_free(s->enc_write_ctx); 774 s->enc_write_ctx = NULL; 775 break; 776 777 case TLS_ST_CW_KEY_EXCH: 778 if (tls_client_key_exchange_post_work(s) == 0) { 779 /* SSLfatal() already called */ 780 return WORK_ERROR; 781 } 782 break; 783 784 case TLS_ST_CW_CHANGE: 785 if (SSL_IS_TLS13(s) || s->hello_retry_request == SSL_HRR_PENDING) 786 break; 787 if (s->early_data_state == SSL_EARLY_DATA_CONNECTING 788 && s->max_early_data > 0) { 789 /* 790 * We haven't selected TLSv1.3 yet so we don't call the change 791 * cipher state function associated with the SSL_METHOD. Instead 792 * we call tls13_change_cipher_state() directly. 793 */ 794 if (!tls13_change_cipher_state(s, 795 SSL3_CC_EARLY | SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 796 return WORK_ERROR; 797 break; 798 } 799 s->session->cipher = s->s3->tmp.new_cipher; 800 #ifdef OPENSSL_NO_COMP 801 s->session->compress_meth = 0; 802 #else 803 if (s->s3->tmp.new_compression == NULL) 804 s->session->compress_meth = 0; 805 else 806 s->session->compress_meth = s->s3->tmp.new_compression->id; 807 #endif 808 if (!s->method->ssl3_enc->setup_key_block(s)) { 809 /* SSLfatal() already called */ 810 return WORK_ERROR; 811 } 812 813 if (!s->method->ssl3_enc->change_cipher_state(s, 814 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) { 815 /* SSLfatal() already called */ 816 return WORK_ERROR; 817 } 818 819 if (SSL_IS_DTLS(s)) { 820 #ifndef OPENSSL_NO_SCTP 821 if (s->hit) { 822 /* 823 * Change to new shared key of SCTP-Auth, will be ignored if 824 * no SCTP used. 825 */ 826 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 827 0, NULL); 828 } 829 #endif 830 831 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 832 } 833 break; 834 835 case TLS_ST_CW_FINISHED: 836 #ifndef OPENSSL_NO_SCTP 837 if (wst == WORK_MORE_A && SSL_IS_DTLS(s) && s->hit == 0) { 838 /* 839 * Change to new shared key of SCTP-Auth, will be ignored if 840 * no SCTP used. 841 */ 842 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 843 0, NULL); 844 } 845 #endif 846 if (statem_flush(s) != 1) 847 return WORK_MORE_B; 848 849 if (SSL_IS_TLS13(s)) { 850 if (!tls13_save_handshake_digest_for_pha(s)) { 851 /* SSLfatal() already called */ 852 return WORK_ERROR; 853 } 854 if (s->post_handshake_auth != SSL_PHA_REQUESTED) { 855 if (!s->method->ssl3_enc->change_cipher_state(s, 856 SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_CLIENT_WRITE)) { 857 /* SSLfatal() already called */ 858 return WORK_ERROR; 859 } 860 } 861 } 862 break; 863 864 case TLS_ST_CW_KEY_UPDATE: 865 if (statem_flush(s) != 1) 866 return WORK_MORE_A; 867 if (!tls13_update_key(s, 1)) { 868 /* SSLfatal() already called */ 869 return WORK_ERROR; 870 } 871 break; 872 } 873 874 return WORK_FINISHED_CONTINUE; 875 } 876 877 /* 878 * Get the message construction function and message type for sending from the 879 * client 880 * 881 * Valid return values are: 882 * 1: Success 883 * 0: Error 884 */ 885 int ossl_statem_client_construct_message(SSL *s, WPACKET *pkt, 886 confunc_f *confunc, int *mt) 887 { 888 OSSL_STATEM *st = &s->statem; 889 890 switch (st->hand_state) { 891 default: 892 /* Shouldn't happen */ 893 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 894 SSL_F_OSSL_STATEM_CLIENT_CONSTRUCT_MESSAGE, 895 SSL_R_BAD_HANDSHAKE_STATE); 896 return 0; 897 898 case TLS_ST_CW_CHANGE: 899 if (SSL_IS_DTLS(s)) 900 *confunc = dtls_construct_change_cipher_spec; 901 else 902 *confunc = tls_construct_change_cipher_spec; 903 *mt = SSL3_MT_CHANGE_CIPHER_SPEC; 904 break; 905 906 case TLS_ST_CW_CLNT_HELLO: 907 *confunc = tls_construct_client_hello; 908 *mt = SSL3_MT_CLIENT_HELLO; 909 break; 910 911 case TLS_ST_CW_END_OF_EARLY_DATA: 912 *confunc = tls_construct_end_of_early_data; 913 *mt = SSL3_MT_END_OF_EARLY_DATA; 914 break; 915 916 case TLS_ST_PENDING_EARLY_DATA_END: 917 *confunc = NULL; 918 *mt = SSL3_MT_DUMMY; 919 break; 920 921 case TLS_ST_CW_CERT: 922 *confunc = tls_construct_client_certificate; 923 *mt = SSL3_MT_CERTIFICATE; 924 break; 925 926 case TLS_ST_CW_KEY_EXCH: 927 *confunc = tls_construct_client_key_exchange; 928 *mt = SSL3_MT_CLIENT_KEY_EXCHANGE; 929 break; 930 931 case TLS_ST_CW_CERT_VRFY: 932 *confunc = tls_construct_cert_verify; 933 *mt = SSL3_MT_CERTIFICATE_VERIFY; 934 break; 935 936 #if !defined(OPENSSL_NO_NEXTPROTONEG) 937 case TLS_ST_CW_NEXT_PROTO: 938 *confunc = tls_construct_next_proto; 939 *mt = SSL3_MT_NEXT_PROTO; 940 break; 941 #endif 942 case TLS_ST_CW_FINISHED: 943 *confunc = tls_construct_finished; 944 *mt = SSL3_MT_FINISHED; 945 break; 946 947 case TLS_ST_CW_KEY_UPDATE: 948 *confunc = tls_construct_key_update; 949 *mt = SSL3_MT_KEY_UPDATE; 950 break; 951 } 952 953 return 1; 954 } 955 956 /* 957 * Returns the maximum allowed length for the current message that we are 958 * reading. Excludes the message header. 959 */ 960 size_t ossl_statem_client_max_message_size(SSL *s) 961 { 962 OSSL_STATEM *st = &s->statem; 963 964 switch (st->hand_state) { 965 default: 966 /* Shouldn't happen */ 967 return 0; 968 969 case TLS_ST_CR_SRVR_HELLO: 970 return SERVER_HELLO_MAX_LENGTH; 971 972 case DTLS_ST_CR_HELLO_VERIFY_REQUEST: 973 return HELLO_VERIFY_REQUEST_MAX_LENGTH; 974 975 case TLS_ST_CR_CERT: 976 return s->max_cert_list; 977 978 case TLS_ST_CR_CERT_VRFY: 979 return SSL3_RT_MAX_PLAIN_LENGTH; 980 981 case TLS_ST_CR_CERT_STATUS: 982 return SSL3_RT_MAX_PLAIN_LENGTH; 983 984 case TLS_ST_CR_KEY_EXCH: 985 return SERVER_KEY_EXCH_MAX_LENGTH; 986 987 case TLS_ST_CR_CERT_REQ: 988 /* 989 * Set to s->max_cert_list for compatibility with previous releases. In 990 * practice these messages can get quite long if servers are configured 991 * to provide a long list of acceptable CAs 992 */ 993 return s->max_cert_list; 994 995 case TLS_ST_CR_SRVR_DONE: 996 return SERVER_HELLO_DONE_MAX_LENGTH; 997 998 case TLS_ST_CR_CHANGE: 999 if (s->version == DTLS1_BAD_VER) 1000 return 3; 1001 return CCS_MAX_LENGTH; 1002 1003 case TLS_ST_CR_SESSION_TICKET: 1004 return SSL3_RT_MAX_PLAIN_LENGTH; 1005 1006 case TLS_ST_CR_FINISHED: 1007 return FINISHED_MAX_LENGTH; 1008 1009 case TLS_ST_CR_ENCRYPTED_EXTENSIONS: 1010 return ENCRYPTED_EXTENSIONS_MAX_LENGTH; 1011 1012 case TLS_ST_CR_KEY_UPDATE: 1013 return KEY_UPDATE_MAX_LENGTH; 1014 } 1015 } 1016 1017 /* 1018 * Process a message that the client has been received from the server. 1019 */ 1020 MSG_PROCESS_RETURN ossl_statem_client_process_message(SSL *s, PACKET *pkt) 1021 { 1022 OSSL_STATEM *st = &s->statem; 1023 1024 switch (st->hand_state) { 1025 default: 1026 /* Shouldn't happen */ 1027 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 1028 SSL_F_OSSL_STATEM_CLIENT_PROCESS_MESSAGE, 1029 ERR_R_INTERNAL_ERROR); 1030 return MSG_PROCESS_ERROR; 1031 1032 case TLS_ST_CR_SRVR_HELLO: 1033 return tls_process_server_hello(s, pkt); 1034 1035 case DTLS_ST_CR_HELLO_VERIFY_REQUEST: 1036 return dtls_process_hello_verify(s, pkt); 1037 1038 case TLS_ST_CR_CERT: 1039 return tls_process_server_certificate(s, pkt); 1040 1041 case TLS_ST_CR_CERT_VRFY: 1042 return tls_process_cert_verify(s, pkt); 1043 1044 case TLS_ST_CR_CERT_STATUS: 1045 return tls_process_cert_status(s, pkt); 1046 1047 case TLS_ST_CR_KEY_EXCH: 1048 return tls_process_key_exchange(s, pkt); 1049 1050 case TLS_ST_CR_CERT_REQ: 1051 return tls_process_certificate_request(s, pkt); 1052 1053 case TLS_ST_CR_SRVR_DONE: 1054 return tls_process_server_done(s, pkt); 1055 1056 case TLS_ST_CR_CHANGE: 1057 return tls_process_change_cipher_spec(s, pkt); 1058 1059 case TLS_ST_CR_SESSION_TICKET: 1060 return tls_process_new_session_ticket(s, pkt); 1061 1062 case TLS_ST_CR_FINISHED: 1063 return tls_process_finished(s, pkt); 1064 1065 case TLS_ST_CR_HELLO_REQ: 1066 return tls_process_hello_req(s, pkt); 1067 1068 case TLS_ST_CR_ENCRYPTED_EXTENSIONS: 1069 return tls_process_encrypted_extensions(s, pkt); 1070 1071 case TLS_ST_CR_KEY_UPDATE: 1072 return tls_process_key_update(s, pkt); 1073 } 1074 } 1075 1076 /* 1077 * Perform any further processing required following the receipt of a message 1078 * from the server 1079 */ 1080 WORK_STATE ossl_statem_client_post_process_message(SSL *s, WORK_STATE wst) 1081 { 1082 OSSL_STATEM *st = &s->statem; 1083 1084 switch (st->hand_state) { 1085 default: 1086 /* Shouldn't happen */ 1087 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 1088 SSL_F_OSSL_STATEM_CLIENT_POST_PROCESS_MESSAGE, 1089 ERR_R_INTERNAL_ERROR); 1090 return WORK_ERROR; 1091 1092 case TLS_ST_CR_CERT_VRFY: 1093 case TLS_ST_CR_CERT_REQ: 1094 return tls_prepare_client_certificate(s, wst); 1095 } 1096 } 1097 1098 int tls_construct_client_hello(SSL *s, WPACKET *pkt) 1099 { 1100 unsigned char *p; 1101 size_t sess_id_len; 1102 int i, protverr; 1103 #ifndef OPENSSL_NO_COMP 1104 SSL_COMP *comp; 1105 #endif 1106 SSL_SESSION *sess = s->session; 1107 unsigned char *session_id; 1108 1109 /* Work out what SSL/TLS/DTLS version to use */ 1110 protverr = ssl_set_client_hello_version(s); 1111 if (protverr != 0) { 1112 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, 1113 protverr); 1114 return 0; 1115 } 1116 1117 if (sess == NULL 1118 || !ssl_version_supported(s, sess->ssl_version, NULL) 1119 || !SSL_SESSION_is_resumable(sess)) { 1120 if (s->hello_retry_request == SSL_HRR_NONE 1121 && !ssl_get_new_session(s, 0)) { 1122 /* SSLfatal() already called */ 1123 return 0; 1124 } 1125 } 1126 /* else use the pre-loaded session */ 1127 1128 p = s->s3->client_random; 1129 1130 /* 1131 * for DTLS if client_random is initialized, reuse it, we are 1132 * required to use same upon reply to HelloVerify 1133 */ 1134 if (SSL_IS_DTLS(s)) { 1135 size_t idx; 1136 i = 1; 1137 for (idx = 0; idx < sizeof(s->s3->client_random); idx++) { 1138 if (p[idx]) { 1139 i = 0; 1140 break; 1141 } 1142 } 1143 } else { 1144 i = (s->hello_retry_request == SSL_HRR_NONE); 1145 } 1146 1147 if (i && ssl_fill_hello_random(s, 0, p, sizeof(s->s3->client_random), 1148 DOWNGRADE_NONE) <= 0) { 1149 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, 1150 ERR_R_INTERNAL_ERROR); 1151 return 0; 1152 } 1153 1154 /*- 1155 * version indicates the negotiated version: for example from 1156 * an SSLv2/v3 compatible client hello). The client_version 1157 * field is the maximum version we permit and it is also 1158 * used in RSA encrypted premaster secrets. Some servers can 1159 * choke if we initially report a higher version then 1160 * renegotiate to a lower one in the premaster secret. This 1161 * didn't happen with TLS 1.0 as most servers supported it 1162 * but it can with TLS 1.1 or later if the server only supports 1163 * 1.0. 1164 * 1165 * Possible scenario with previous logic: 1166 * 1. Client hello indicates TLS 1.2 1167 * 2. Server hello says TLS 1.0 1168 * 3. RSA encrypted premaster secret uses 1.2. 1169 * 4. Handshake proceeds using TLS 1.0. 1170 * 5. Server sends hello request to renegotiate. 1171 * 6. Client hello indicates TLS v1.0 as we now 1172 * know that is maximum server supports. 1173 * 7. Server chokes on RSA encrypted premaster secret 1174 * containing version 1.0. 1175 * 1176 * For interoperability it should be OK to always use the 1177 * maximum version we support in client hello and then rely 1178 * on the checking of version to ensure the servers isn't 1179 * being inconsistent: for example initially negotiating with 1180 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using 1181 * client_version in client hello and not resetting it to 1182 * the negotiated version. 1183 * 1184 * For TLS 1.3 we always set the ClientHello version to 1.2 and rely on the 1185 * supported_versions extension for the real supported versions. 1186 */ 1187 if (!WPACKET_put_bytes_u16(pkt, s->client_version) 1188 || !WPACKET_memcpy(pkt, s->s3->client_random, SSL3_RANDOM_SIZE)) { 1189 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, 1190 ERR_R_INTERNAL_ERROR); 1191 return 0; 1192 } 1193 1194 /* Session ID */ 1195 session_id = s->session->session_id; 1196 if (s->new_session || s->session->ssl_version == TLS1_3_VERSION) { 1197 if (s->version == TLS1_3_VERSION 1198 && (s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) != 0) { 1199 sess_id_len = sizeof(s->tmp_session_id); 1200 s->tmp_session_id_len = sess_id_len; 1201 session_id = s->tmp_session_id; 1202 if (s->hello_retry_request == SSL_HRR_NONE 1203 && RAND_bytes(s->tmp_session_id, sess_id_len) <= 0) { 1204 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 1205 SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, 1206 ERR_R_INTERNAL_ERROR); 1207 return 0; 1208 } 1209 } else { 1210 sess_id_len = 0; 1211 } 1212 } else { 1213 assert(s->session->session_id_length <= sizeof(s->session->session_id)); 1214 sess_id_len = s->session->session_id_length; 1215 if (s->version == TLS1_3_VERSION) { 1216 s->tmp_session_id_len = sess_id_len; 1217 memcpy(s->tmp_session_id, s->session->session_id, sess_id_len); 1218 } 1219 } 1220 if (!WPACKET_start_sub_packet_u8(pkt) 1221 || (sess_id_len != 0 && !WPACKET_memcpy(pkt, session_id, 1222 sess_id_len)) 1223 || !WPACKET_close(pkt)) { 1224 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, 1225 ERR_R_INTERNAL_ERROR); 1226 return 0; 1227 } 1228 1229 /* cookie stuff for DTLS */ 1230 if (SSL_IS_DTLS(s)) { 1231 if (s->d1->cookie_len > sizeof(s->d1->cookie) 1232 || !WPACKET_sub_memcpy_u8(pkt, s->d1->cookie, 1233 s->d1->cookie_len)) { 1234 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, 1235 ERR_R_INTERNAL_ERROR); 1236 return 0; 1237 } 1238 } 1239 1240 /* Ciphers supported */ 1241 if (!WPACKET_start_sub_packet_u16(pkt)) { 1242 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, 1243 ERR_R_INTERNAL_ERROR); 1244 return 0; 1245 } 1246 1247 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), pkt)) { 1248 /* SSLfatal() already called */ 1249 return 0; 1250 } 1251 if (!WPACKET_close(pkt)) { 1252 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, 1253 ERR_R_INTERNAL_ERROR); 1254 return 0; 1255 } 1256 1257 /* COMPRESSION */ 1258 if (!WPACKET_start_sub_packet_u8(pkt)) { 1259 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, 1260 ERR_R_INTERNAL_ERROR); 1261 return 0; 1262 } 1263 #ifndef OPENSSL_NO_COMP 1264 if (ssl_allow_compression(s) 1265 && s->ctx->comp_methods 1266 && (SSL_IS_DTLS(s) || s->s3->tmp.max_ver < TLS1_3_VERSION)) { 1267 int compnum = sk_SSL_COMP_num(s->ctx->comp_methods); 1268 for (i = 0; i < compnum; i++) { 1269 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i); 1270 if (!WPACKET_put_bytes_u8(pkt, comp->id)) { 1271 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 1272 SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, 1273 ERR_R_INTERNAL_ERROR); 1274 return 0; 1275 } 1276 } 1277 } 1278 #endif 1279 /* Add the NULL method */ 1280 if (!WPACKET_put_bytes_u8(pkt, 0) || !WPACKET_close(pkt)) { 1281 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, 1282 ERR_R_INTERNAL_ERROR); 1283 return 0; 1284 } 1285 1286 /* TLS extensions */ 1287 if (!tls_construct_extensions(s, pkt, SSL_EXT_CLIENT_HELLO, NULL, 0)) { 1288 /* SSLfatal() already called */ 1289 return 0; 1290 } 1291 1292 return 1; 1293 } 1294 1295 MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, PACKET *pkt) 1296 { 1297 size_t cookie_len; 1298 PACKET cookiepkt; 1299 1300 if (!PACKET_forward(pkt, 2) 1301 || !PACKET_get_length_prefixed_1(pkt, &cookiepkt)) { 1302 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_DTLS_PROCESS_HELLO_VERIFY, 1303 SSL_R_LENGTH_MISMATCH); 1304 return MSG_PROCESS_ERROR; 1305 } 1306 1307 cookie_len = PACKET_remaining(&cookiepkt); 1308 if (cookie_len > sizeof(s->d1->cookie)) { 1309 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_DTLS_PROCESS_HELLO_VERIFY, 1310 SSL_R_LENGTH_TOO_LONG); 1311 return MSG_PROCESS_ERROR; 1312 } 1313 1314 if (!PACKET_copy_bytes(&cookiepkt, s->d1->cookie, cookie_len)) { 1315 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_DTLS_PROCESS_HELLO_VERIFY, 1316 SSL_R_LENGTH_MISMATCH); 1317 return MSG_PROCESS_ERROR; 1318 } 1319 s->d1->cookie_len = cookie_len; 1320 1321 return MSG_PROCESS_FINISHED_READING; 1322 } 1323 1324 static int set_client_ciphersuite(SSL *s, const unsigned char *cipherchars) 1325 { 1326 STACK_OF(SSL_CIPHER) *sk; 1327 const SSL_CIPHER *c; 1328 int i; 1329 1330 c = ssl_get_cipher_by_char(s, cipherchars, 0); 1331 if (c == NULL) { 1332 /* unknown cipher */ 1333 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_SET_CLIENT_CIPHERSUITE, 1334 SSL_R_UNKNOWN_CIPHER_RETURNED); 1335 return 0; 1336 } 1337 /* 1338 * If it is a disabled cipher we either didn't send it in client hello, 1339 * or it's not allowed for the selected protocol. So we return an error. 1340 */ 1341 if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK, 1)) { 1342 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_SET_CLIENT_CIPHERSUITE, 1343 SSL_R_WRONG_CIPHER_RETURNED); 1344 return 0; 1345 } 1346 1347 sk = ssl_get_ciphers_by_id(s); 1348 i = sk_SSL_CIPHER_find(sk, c); 1349 if (i < 0) { 1350 /* we did not say we would use this cipher */ 1351 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_SET_CLIENT_CIPHERSUITE, 1352 SSL_R_WRONG_CIPHER_RETURNED); 1353 return 0; 1354 } 1355 1356 if (SSL_IS_TLS13(s) && s->s3->tmp.new_cipher != NULL 1357 && s->s3->tmp.new_cipher->id != c->id) { 1358 /* ServerHello selected a different ciphersuite to that in the HRR */ 1359 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_SET_CLIENT_CIPHERSUITE, 1360 SSL_R_WRONG_CIPHER_RETURNED); 1361 return 0; 1362 } 1363 1364 /* 1365 * Depending on the session caching (internal/external), the cipher 1366 * and/or cipher_id values may not be set. Make sure that cipher_id is 1367 * set and use it for comparison. 1368 */ 1369 if (s->session->cipher != NULL) 1370 s->session->cipher_id = s->session->cipher->id; 1371 if (s->hit && (s->session->cipher_id != c->id)) { 1372 if (SSL_IS_TLS13(s)) { 1373 /* 1374 * In TLSv1.3 it is valid for the server to select a different 1375 * ciphersuite as long as the hash is the same. 1376 */ 1377 if (ssl_md(c->algorithm2) 1378 != ssl_md(s->session->cipher->algorithm2)) { 1379 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, 1380 SSL_F_SET_CLIENT_CIPHERSUITE, 1381 SSL_R_CIPHERSUITE_DIGEST_HAS_CHANGED); 1382 return 0; 1383 } 1384 } else { 1385 /* 1386 * Prior to TLSv1.3 resuming a session always meant using the same 1387 * ciphersuite. 1388 */ 1389 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_SET_CLIENT_CIPHERSUITE, 1390 SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1391 return 0; 1392 } 1393 } 1394 s->s3->tmp.new_cipher = c; 1395 1396 return 1; 1397 } 1398 1399 MSG_PROCESS_RETURN tls_process_server_hello(SSL *s, PACKET *pkt) 1400 { 1401 PACKET session_id, extpkt; 1402 size_t session_id_len; 1403 const unsigned char *cipherchars; 1404 int hrr = 0; 1405 unsigned int compression; 1406 unsigned int sversion; 1407 unsigned int context; 1408 RAW_EXTENSION *extensions = NULL; 1409 #ifndef OPENSSL_NO_COMP 1410 SSL_COMP *comp; 1411 #endif 1412 1413 if (!PACKET_get_net_2(pkt, &sversion)) { 1414 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_SERVER_HELLO, 1415 SSL_R_LENGTH_MISMATCH); 1416 goto err; 1417 } 1418 1419 /* load the server random */ 1420 if (s->version == TLS1_3_VERSION 1421 && sversion == TLS1_2_VERSION 1422 && PACKET_remaining(pkt) >= SSL3_RANDOM_SIZE 1423 && memcmp(hrrrandom, PACKET_data(pkt), SSL3_RANDOM_SIZE) == 0) { 1424 s->hello_retry_request = SSL_HRR_PENDING; 1425 hrr = 1; 1426 if (!PACKET_forward(pkt, SSL3_RANDOM_SIZE)) { 1427 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_SERVER_HELLO, 1428 SSL_R_LENGTH_MISMATCH); 1429 goto err; 1430 } 1431 } else { 1432 if (!PACKET_copy_bytes(pkt, s->s3->server_random, SSL3_RANDOM_SIZE)) { 1433 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_SERVER_HELLO, 1434 SSL_R_LENGTH_MISMATCH); 1435 goto err; 1436 } 1437 } 1438 1439 /* Get the session-id. */ 1440 if (!PACKET_get_length_prefixed_1(pkt, &session_id)) { 1441 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_SERVER_HELLO, 1442 SSL_R_LENGTH_MISMATCH); 1443 goto err; 1444 } 1445 session_id_len = PACKET_remaining(&session_id); 1446 if (session_id_len > sizeof(s->session->session_id) 1447 || session_id_len > SSL3_SESSION_ID_SIZE) { 1448 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PROCESS_SERVER_HELLO, 1449 SSL_R_SSL3_SESSION_ID_TOO_LONG); 1450 goto err; 1451 } 1452 1453 if (!PACKET_get_bytes(pkt, &cipherchars, TLS_CIPHER_LEN)) { 1454 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_SERVER_HELLO, 1455 SSL_R_LENGTH_MISMATCH); 1456 goto err; 1457 } 1458 1459 if (!PACKET_get_1(pkt, &compression)) { 1460 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_SERVER_HELLO, 1461 SSL_R_LENGTH_MISMATCH); 1462 goto err; 1463 } 1464 1465 /* TLS extensions */ 1466 if (PACKET_remaining(pkt) == 0 && !hrr) { 1467 PACKET_null_init(&extpkt); 1468 } else if (!PACKET_as_length_prefixed_2(pkt, &extpkt) 1469 || PACKET_remaining(pkt) != 0) { 1470 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_SERVER_HELLO, 1471 SSL_R_BAD_LENGTH); 1472 goto err; 1473 } 1474 1475 if (!hrr) { 1476 if (!tls_collect_extensions(s, &extpkt, 1477 SSL_EXT_TLS1_2_SERVER_HELLO 1478 | SSL_EXT_TLS1_3_SERVER_HELLO, 1479 &extensions, NULL, 1)) { 1480 /* SSLfatal() already called */ 1481 goto err; 1482 } 1483 1484 if (!ssl_choose_client_version(s, sversion, extensions)) { 1485 /* SSLfatal() already called */ 1486 goto err; 1487 } 1488 } 1489 1490 if (SSL_IS_TLS13(s) || hrr) { 1491 if (compression != 0) { 1492 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, 1493 SSL_F_TLS_PROCESS_SERVER_HELLO, 1494 SSL_R_INVALID_COMPRESSION_ALGORITHM); 1495 goto err; 1496 } 1497 1498 if (session_id_len != s->tmp_session_id_len 1499 || memcmp(PACKET_data(&session_id), s->tmp_session_id, 1500 session_id_len) != 0) { 1501 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, 1502 SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_INVALID_SESSION_ID); 1503 goto err; 1504 } 1505 } 1506 1507 if (hrr) { 1508 if (!set_client_ciphersuite(s, cipherchars)) { 1509 /* SSLfatal() already called */ 1510 goto err; 1511 } 1512 1513 return tls_process_as_hello_retry_request(s, &extpkt); 1514 } 1515 1516 /* 1517 * Now we have chosen the version we need to check again that the extensions 1518 * are appropriate for this version. 1519 */ 1520 context = SSL_IS_TLS13(s) ? SSL_EXT_TLS1_3_SERVER_HELLO 1521 : SSL_EXT_TLS1_2_SERVER_HELLO; 1522 if (!tls_validate_all_contexts(s, context, extensions)) { 1523 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PROCESS_SERVER_HELLO, 1524 SSL_R_BAD_EXTENSION); 1525 goto err; 1526 } 1527 1528 s->hit = 0; 1529 1530 if (SSL_IS_TLS13(s)) { 1531 /* 1532 * In TLSv1.3 a ServerHello message signals a key change so the end of 1533 * the message must be on a record boundary. 1534 */ 1535 if (RECORD_LAYER_processed_read_pending(&s->rlayer)) { 1536 SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, 1537 SSL_F_TLS_PROCESS_SERVER_HELLO, 1538 SSL_R_NOT_ON_RECORD_BOUNDARY); 1539 goto err; 1540 } 1541 1542 /* This will set s->hit if we are resuming */ 1543 if (!tls_parse_extension(s, TLSEXT_IDX_psk, 1544 SSL_EXT_TLS1_3_SERVER_HELLO, 1545 extensions, NULL, 0)) { 1546 /* SSLfatal() already called */ 1547 goto err; 1548 } 1549 } else { 1550 /* 1551 * Check if we can resume the session based on external pre-shared 1552 * secret. EAP-FAST (RFC 4851) supports two types of session resumption. 1553 * Resumption based on server-side state works with session IDs. 1554 * Resumption based on pre-shared Protected Access Credentials (PACs) 1555 * works by overriding the SessionTicket extension at the application 1556 * layer, and does not send a session ID. (We do not know whether 1557 * EAP-FAST servers would honour the session ID.) Therefore, the session 1558 * ID alone is not a reliable indicator of session resumption, so we 1559 * first check if we can resume, and later peek at the next handshake 1560 * message to see if the server wants to resume. 1561 */ 1562 if (s->version >= TLS1_VERSION 1563 && s->ext.session_secret_cb != NULL && s->session->ext.tick) { 1564 const SSL_CIPHER *pref_cipher = NULL; 1565 /* 1566 * s->session->master_key_length is a size_t, but this is an int for 1567 * backwards compat reasons 1568 */ 1569 int master_key_length; 1570 master_key_length = sizeof(s->session->master_key); 1571 if (s->ext.session_secret_cb(s, s->session->master_key, 1572 &master_key_length, 1573 NULL, &pref_cipher, 1574 s->ext.session_secret_cb_arg) 1575 && master_key_length > 0) { 1576 s->session->master_key_length = master_key_length; 1577 s->session->cipher = pref_cipher ? 1578 pref_cipher : ssl_get_cipher_by_char(s, cipherchars, 0); 1579 } else { 1580 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 1581 SSL_F_TLS_PROCESS_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 1582 goto err; 1583 } 1584 } 1585 1586 if (session_id_len != 0 1587 && session_id_len == s->session->session_id_length 1588 && memcmp(PACKET_data(&session_id), s->session->session_id, 1589 session_id_len) == 0) 1590 s->hit = 1; 1591 } 1592 1593 if (s->hit) { 1594 if (s->sid_ctx_length != s->session->sid_ctx_length 1595 || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) { 1596 /* actually a client application bug */ 1597 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, 1598 SSL_F_TLS_PROCESS_SERVER_HELLO, 1599 SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 1600 goto err; 1601 } 1602 } else { 1603 /* 1604 * If we were trying for session-id reuse but the server 1605 * didn't resume, make a new SSL_SESSION. 1606 * In the case of EAP-FAST and PAC, we do not send a session ID, 1607 * so the PAC-based session secret is always preserved. It'll be 1608 * overwritten if the server refuses resumption. 1609 */ 1610 if (s->session->session_id_length > 0) { 1611 tsan_counter(&s->session_ctx->stats.sess_miss); 1612 if (!ssl_get_new_session(s, 0)) { 1613 /* SSLfatal() already called */ 1614 goto err; 1615 } 1616 } 1617 1618 s->session->ssl_version = s->version; 1619 /* 1620 * In TLSv1.2 and below we save the session id we were sent so we can 1621 * resume it later. In TLSv1.3 the session id we were sent is just an 1622 * echo of what we originally sent in the ClientHello and should not be 1623 * used for resumption. 1624 */ 1625 if (!SSL_IS_TLS13(s)) { 1626 s->session->session_id_length = session_id_len; 1627 /* session_id_len could be 0 */ 1628 if (session_id_len > 0) 1629 memcpy(s->session->session_id, PACKET_data(&session_id), 1630 session_id_len); 1631 } 1632 } 1633 1634 /* Session version and negotiated protocol version should match */ 1635 if (s->version != s->session->ssl_version) { 1636 SSLfatal(s, SSL_AD_PROTOCOL_VERSION, SSL_F_TLS_PROCESS_SERVER_HELLO, 1637 SSL_R_SSL_SESSION_VERSION_MISMATCH); 1638 goto err; 1639 } 1640 /* 1641 * Now that we know the version, update the check to see if it's an allowed 1642 * version. 1643 */ 1644 s->s3->tmp.min_ver = s->version; 1645 s->s3->tmp.max_ver = s->version; 1646 1647 if (!set_client_ciphersuite(s, cipherchars)) { 1648 /* SSLfatal() already called */ 1649 goto err; 1650 } 1651 1652 #ifdef OPENSSL_NO_COMP 1653 if (compression != 0) { 1654 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PROCESS_SERVER_HELLO, 1655 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1656 goto err; 1657 } 1658 /* 1659 * If compression is disabled we'd better not try to resume a session 1660 * using compression. 1661 */ 1662 if (s->session->compress_meth != 0) { 1663 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS_PROCESS_SERVER_HELLO, 1664 SSL_R_INCONSISTENT_COMPRESSION); 1665 goto err; 1666 } 1667 #else 1668 if (s->hit && compression != s->session->compress_meth) { 1669 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PROCESS_SERVER_HELLO, 1670 SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED); 1671 goto err; 1672 } 1673 if (compression == 0) 1674 comp = NULL; 1675 else if (!ssl_allow_compression(s)) { 1676 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PROCESS_SERVER_HELLO, 1677 SSL_R_COMPRESSION_DISABLED); 1678 goto err; 1679 } else { 1680 comp = ssl3_comp_find(s->ctx->comp_methods, compression); 1681 } 1682 1683 if (compression != 0 && comp == NULL) { 1684 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PROCESS_SERVER_HELLO, 1685 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1686 goto err; 1687 } else { 1688 s->s3->tmp.new_compression = comp; 1689 } 1690 #endif 1691 1692 if (!tls_parse_all_extensions(s, context, extensions, NULL, 0, 1)) { 1693 /* SSLfatal() already called */ 1694 goto err; 1695 } 1696 1697 #ifndef OPENSSL_NO_SCTP 1698 if (SSL_IS_DTLS(s) && s->hit) { 1699 unsigned char sctpauthkey[64]; 1700 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; 1701 size_t labellen; 1702 1703 /* 1704 * Add new shared key for SCTP-Auth, will be ignored if 1705 * no SCTP used. 1706 */ 1707 memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, 1708 sizeof(DTLS1_SCTP_AUTH_LABEL)); 1709 1710 /* Don't include the terminating zero. */ 1711 labellen = sizeof(labelbuffer) - 1; 1712 if (s->mode & SSL_MODE_DTLS_SCTP_LABEL_LENGTH_BUG) 1713 labellen += 1; 1714 1715 if (SSL_export_keying_material(s, sctpauthkey, 1716 sizeof(sctpauthkey), 1717 labelbuffer, 1718 labellen, NULL, 0, 0) <= 0) { 1719 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_SERVER_HELLO, 1720 ERR_R_INTERNAL_ERROR); 1721 goto err; 1722 } 1723 1724 BIO_ctrl(SSL_get_wbio(s), 1725 BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 1726 sizeof(sctpauthkey), sctpauthkey); 1727 } 1728 #endif 1729 1730 /* 1731 * In TLSv1.3 we have some post-processing to change cipher state, otherwise 1732 * we're done with this message 1733 */ 1734 if (SSL_IS_TLS13(s) 1735 && (!s->method->ssl3_enc->setup_key_block(s) 1736 || !s->method->ssl3_enc->change_cipher_state(s, 1737 SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_CLIENT_READ))) { 1738 /* SSLfatal() already called */ 1739 goto err; 1740 } 1741 1742 OPENSSL_free(extensions); 1743 return MSG_PROCESS_CONTINUE_READING; 1744 err: 1745 OPENSSL_free(extensions); 1746 return MSG_PROCESS_ERROR; 1747 } 1748 1749 static MSG_PROCESS_RETURN tls_process_as_hello_retry_request(SSL *s, 1750 PACKET *extpkt) 1751 { 1752 RAW_EXTENSION *extensions = NULL; 1753 1754 /* 1755 * If we were sending early_data then the enc_write_ctx is now invalid and 1756 * should not be used. 1757 */ 1758 EVP_CIPHER_CTX_free(s->enc_write_ctx); 1759 s->enc_write_ctx = NULL; 1760 1761 if (!tls_collect_extensions(s, extpkt, SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST, 1762 &extensions, NULL, 1) 1763 || !tls_parse_all_extensions(s, SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST, 1764 extensions, NULL, 0, 1)) { 1765 /* SSLfatal() already called */ 1766 goto err; 1767 } 1768 1769 OPENSSL_free(extensions); 1770 extensions = NULL; 1771 1772 if (s->ext.tls13_cookie_len == 0 1773 #if !defined(OPENSSL_NO_EC) || !defined(OPENSSL_NO_DH) 1774 && s->s3->tmp.pkey != NULL 1775 #endif 1776 ) { 1777 /* 1778 * We didn't receive a cookie or a new key_share so the next 1779 * ClientHello will not change 1780 */ 1781 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, 1782 SSL_F_TLS_PROCESS_AS_HELLO_RETRY_REQUEST, 1783 SSL_R_NO_CHANGE_FOLLOWING_HRR); 1784 goto err; 1785 } 1786 1787 /* 1788 * Re-initialise the Transcript Hash. We're going to prepopulate it with 1789 * a synthetic message_hash in place of ClientHello1. 1790 */ 1791 if (!create_synthetic_message_hash(s, NULL, 0, NULL, 0)) { 1792 /* SSLfatal() already called */ 1793 goto err; 1794 } 1795 1796 /* 1797 * Add this message to the Transcript Hash. Normally this is done 1798 * automatically prior to the message processing stage. However due to the 1799 * need to create the synthetic message hash, we defer that step until now 1800 * for HRR messages. 1801 */ 1802 if (!ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, 1803 s->init_num + SSL3_HM_HEADER_LENGTH)) { 1804 /* SSLfatal() already called */ 1805 goto err; 1806 } 1807 1808 return MSG_PROCESS_FINISHED_READING; 1809 err: 1810 OPENSSL_free(extensions); 1811 return MSG_PROCESS_ERROR; 1812 } 1813 1814 MSG_PROCESS_RETURN tls_process_server_certificate(SSL *s, PACKET *pkt) 1815 { 1816 int i; 1817 MSG_PROCESS_RETURN ret = MSG_PROCESS_ERROR; 1818 unsigned long cert_list_len, cert_len; 1819 X509 *x = NULL; 1820 const unsigned char *certstart, *certbytes; 1821 STACK_OF(X509) *sk = NULL; 1822 EVP_PKEY *pkey = NULL; 1823 size_t chainidx, certidx; 1824 unsigned int context = 0; 1825 const SSL_CERT_LOOKUP *clu; 1826 1827 if ((sk = sk_X509_new_null()) == NULL) { 1828 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, 1829 ERR_R_MALLOC_FAILURE); 1830 goto err; 1831 } 1832 1833 if ((SSL_IS_TLS13(s) && !PACKET_get_1(pkt, &context)) 1834 || context != 0 1835 || !PACKET_get_net_3(pkt, &cert_list_len) 1836 || PACKET_remaining(pkt) != cert_list_len 1837 || PACKET_remaining(pkt) == 0) { 1838 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, 1839 SSL_R_LENGTH_MISMATCH); 1840 goto err; 1841 } 1842 for (chainidx = 0; PACKET_remaining(pkt); chainidx++) { 1843 if (!PACKET_get_net_3(pkt, &cert_len) 1844 || !PACKET_get_bytes(pkt, &certbytes, cert_len)) { 1845 SSLfatal(s, SSL_AD_DECODE_ERROR, 1846 SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, 1847 SSL_R_CERT_LENGTH_MISMATCH); 1848 goto err; 1849 } 1850 1851 certstart = certbytes; 1852 x = d2i_X509(NULL, (const unsigned char **)&certbytes, cert_len); 1853 if (x == NULL) { 1854 SSLfatal(s, SSL_AD_BAD_CERTIFICATE, 1855 SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, ERR_R_ASN1_LIB); 1856 goto err; 1857 } 1858 if (certbytes != (certstart + cert_len)) { 1859 SSLfatal(s, SSL_AD_DECODE_ERROR, 1860 SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, 1861 SSL_R_CERT_LENGTH_MISMATCH); 1862 goto err; 1863 } 1864 1865 if (SSL_IS_TLS13(s)) { 1866 RAW_EXTENSION *rawexts = NULL; 1867 PACKET extensions; 1868 1869 if (!PACKET_get_length_prefixed_2(pkt, &extensions)) { 1870 SSLfatal(s, SSL_AD_DECODE_ERROR, 1871 SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, 1872 SSL_R_BAD_LENGTH); 1873 goto err; 1874 } 1875 if (!tls_collect_extensions(s, &extensions, 1876 SSL_EXT_TLS1_3_CERTIFICATE, &rawexts, 1877 NULL, chainidx == 0) 1878 || !tls_parse_all_extensions(s, SSL_EXT_TLS1_3_CERTIFICATE, 1879 rawexts, x, chainidx, 1880 PACKET_remaining(pkt) == 0)) { 1881 OPENSSL_free(rawexts); 1882 /* SSLfatal already called */ 1883 goto err; 1884 } 1885 OPENSSL_free(rawexts); 1886 } 1887 1888 if (!sk_X509_push(sk, x)) { 1889 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 1890 SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, 1891 ERR_R_MALLOC_FAILURE); 1892 goto err; 1893 } 1894 x = NULL; 1895 } 1896 1897 i = ssl_verify_cert_chain(s, sk); 1898 /* 1899 * The documented interface is that SSL_VERIFY_PEER should be set in order 1900 * for client side verification of the server certificate to take place. 1901 * However, historically the code has only checked that *any* flag is set 1902 * to cause server verification to take place. Use of the other flags makes 1903 * no sense in client mode. An attempt to clean up the semantics was 1904 * reverted because at least one application *only* set 1905 * SSL_VERIFY_FAIL_IF_NO_PEER_CERT. Prior to the clean up this still caused 1906 * server verification to take place, after the clean up it silently did 1907 * nothing. SSL_CTX_set_verify()/SSL_set_verify() cannot validate the flags 1908 * sent to them because they are void functions. Therefore, we now use the 1909 * (less clean) historic behaviour of performing validation if any flag is 1910 * set. The *documented* interface remains the same. 1911 */ 1912 if (s->verify_mode != SSL_VERIFY_NONE && i <= 0) { 1913 SSLfatal(s, ssl_x509err2alert(s->verify_result), 1914 SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, 1915 SSL_R_CERTIFICATE_VERIFY_FAILED); 1916 goto err; 1917 } 1918 ERR_clear_error(); /* but we keep s->verify_result */ 1919 if (i > 1) { 1920 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 1921 SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, i); 1922 goto err; 1923 } 1924 1925 s->session->peer_chain = sk; 1926 /* 1927 * Inconsistency alert: cert_chain does include the peer's certificate, 1928 * which we don't include in statem_srvr.c 1929 */ 1930 x = sk_X509_value(sk, 0); 1931 sk = NULL; 1932 1933 pkey = X509_get0_pubkey(x); 1934 1935 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1936 x = NULL; 1937 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, 1938 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1939 goto err; 1940 } 1941 1942 if ((clu = ssl_cert_lookup_by_pkey(pkey, &certidx)) == NULL) { 1943 x = NULL; 1944 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, 1945 SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, 1946 SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1947 goto err; 1948 } 1949 /* 1950 * Check certificate type is consistent with ciphersuite. For TLS 1.3 1951 * skip check since TLS 1.3 ciphersuites can be used with any certificate 1952 * type. 1953 */ 1954 if (!SSL_IS_TLS13(s)) { 1955 if ((clu->amask & s->s3->tmp.new_cipher->algorithm_auth) == 0) { 1956 x = NULL; 1957 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, 1958 SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, 1959 SSL_R_WRONG_CERTIFICATE_TYPE); 1960 goto err; 1961 } 1962 } 1963 1964 X509_free(s->session->peer); 1965 X509_up_ref(x); 1966 s->session->peer = x; 1967 s->session->verify_result = s->verify_result; 1968 x = NULL; 1969 1970 /* Save the current hash state for when we receive the CertificateVerify */ 1971 if (SSL_IS_TLS13(s) 1972 && !ssl_handshake_hash(s, s->cert_verify_hash, 1973 sizeof(s->cert_verify_hash), 1974 &s->cert_verify_hash_len)) { 1975 /* SSLfatal() already called */; 1976 goto err; 1977 } 1978 1979 ret = MSG_PROCESS_CONTINUE_READING; 1980 1981 err: 1982 X509_free(x); 1983 sk_X509_pop_free(sk, X509_free); 1984 return ret; 1985 } 1986 1987 static int tls_process_ske_psk_preamble(SSL *s, PACKET *pkt) 1988 { 1989 #ifndef OPENSSL_NO_PSK 1990 PACKET psk_identity_hint; 1991 1992 /* PSK ciphersuites are preceded by an identity hint */ 1993 1994 if (!PACKET_get_length_prefixed_2(pkt, &psk_identity_hint)) { 1995 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_SKE_PSK_PREAMBLE, 1996 SSL_R_LENGTH_MISMATCH); 1997 return 0; 1998 } 1999 2000 /* 2001 * Store PSK identity hint for later use, hint is used in 2002 * tls_construct_client_key_exchange. Assume that the maximum length of 2003 * a PSK identity hint can be as long as the maximum length of a PSK 2004 * identity. 2005 */ 2006 if (PACKET_remaining(&psk_identity_hint) > PSK_MAX_IDENTITY_LEN) { 2007 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 2008 SSL_F_TLS_PROCESS_SKE_PSK_PREAMBLE, 2009 SSL_R_DATA_LENGTH_TOO_LONG); 2010 return 0; 2011 } 2012 2013 if (PACKET_remaining(&psk_identity_hint) == 0) { 2014 OPENSSL_free(s->session->psk_identity_hint); 2015 s->session->psk_identity_hint = NULL; 2016 } else if (!PACKET_strndup(&psk_identity_hint, 2017 &s->session->psk_identity_hint)) { 2018 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_SKE_PSK_PREAMBLE, 2019 ERR_R_INTERNAL_ERROR); 2020 return 0; 2021 } 2022 2023 return 1; 2024 #else 2025 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_SKE_PSK_PREAMBLE, 2026 ERR_R_INTERNAL_ERROR); 2027 return 0; 2028 #endif 2029 } 2030 2031 static int tls_process_ske_srp(SSL *s, PACKET *pkt, EVP_PKEY **pkey) 2032 { 2033 #ifndef OPENSSL_NO_SRP 2034 PACKET prime, generator, salt, server_pub; 2035 2036 if (!PACKET_get_length_prefixed_2(pkt, &prime) 2037 || !PACKET_get_length_prefixed_2(pkt, &generator) 2038 || !PACKET_get_length_prefixed_1(pkt, &salt) 2039 || !PACKET_get_length_prefixed_2(pkt, &server_pub)) { 2040 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_SKE_SRP, 2041 SSL_R_LENGTH_MISMATCH); 2042 return 0; 2043 } 2044 2045 /* TODO(size_t): Convert BN_bin2bn() calls */ 2046 if ((s->srp_ctx.N = 2047 BN_bin2bn(PACKET_data(&prime), 2048 (int)PACKET_remaining(&prime), NULL)) == NULL 2049 || (s->srp_ctx.g = 2050 BN_bin2bn(PACKET_data(&generator), 2051 (int)PACKET_remaining(&generator), NULL)) == NULL 2052 || (s->srp_ctx.s = 2053 BN_bin2bn(PACKET_data(&salt), 2054 (int)PACKET_remaining(&salt), NULL)) == NULL 2055 || (s->srp_ctx.B = 2056 BN_bin2bn(PACKET_data(&server_pub), 2057 (int)PACKET_remaining(&server_pub), NULL)) == NULL) { 2058 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_SKE_SRP, 2059 ERR_R_BN_LIB); 2060 return 0; 2061 } 2062 2063 if (!srp_verify_server_param(s)) { 2064 /* SSLfatal() already called */ 2065 return 0; 2066 } 2067 2068 /* We must check if there is a certificate */ 2069 if (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aRSA | SSL_aDSS)) 2070 *pkey = X509_get0_pubkey(s->session->peer); 2071 2072 return 1; 2073 #else 2074 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_SKE_SRP, 2075 ERR_R_INTERNAL_ERROR); 2076 return 0; 2077 #endif 2078 } 2079 2080 static int tls_process_ske_dhe(SSL *s, PACKET *pkt, EVP_PKEY **pkey) 2081 { 2082 #ifndef OPENSSL_NO_DH 2083 PACKET prime, generator, pub_key; 2084 EVP_PKEY *peer_tmp = NULL; 2085 2086 DH *dh = NULL; 2087 BIGNUM *p = NULL, *g = NULL, *bnpub_key = NULL; 2088 2089 int check_bits = 0; 2090 2091 if (!PACKET_get_length_prefixed_2(pkt, &prime) 2092 || !PACKET_get_length_prefixed_2(pkt, &generator) 2093 || !PACKET_get_length_prefixed_2(pkt, &pub_key)) { 2094 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_SKE_DHE, 2095 SSL_R_LENGTH_MISMATCH); 2096 return 0; 2097 } 2098 2099 peer_tmp = EVP_PKEY_new(); 2100 dh = DH_new(); 2101 2102 if (peer_tmp == NULL || dh == NULL) { 2103 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_SKE_DHE, 2104 ERR_R_MALLOC_FAILURE); 2105 goto err; 2106 } 2107 2108 /* TODO(size_t): Convert these calls */ 2109 p = BN_bin2bn(PACKET_data(&prime), (int)PACKET_remaining(&prime), NULL); 2110 g = BN_bin2bn(PACKET_data(&generator), (int)PACKET_remaining(&generator), 2111 NULL); 2112 bnpub_key = BN_bin2bn(PACKET_data(&pub_key), 2113 (int)PACKET_remaining(&pub_key), NULL); 2114 if (p == NULL || g == NULL || bnpub_key == NULL) { 2115 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_SKE_DHE, 2116 ERR_R_BN_LIB); 2117 goto err; 2118 } 2119 2120 /* test non-zero pubkey */ 2121 if (BN_is_zero(bnpub_key)) { 2122 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PROCESS_SKE_DHE, 2123 SSL_R_BAD_DH_VALUE); 2124 goto err; 2125 } 2126 2127 if (!DH_set0_pqg(dh, p, NULL, g)) { 2128 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_SKE_DHE, 2129 ERR_R_BN_LIB); 2130 goto err; 2131 } 2132 p = g = NULL; 2133 2134 if (DH_check_params(dh, &check_bits) == 0 || check_bits != 0) { 2135 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PROCESS_SKE_DHE, 2136 SSL_R_BAD_DH_VALUE); 2137 goto err; 2138 } 2139 2140 if (!DH_set0_key(dh, bnpub_key, NULL)) { 2141 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_SKE_DHE, 2142 ERR_R_BN_LIB); 2143 goto err; 2144 } 2145 bnpub_key = NULL; 2146 2147 if (EVP_PKEY_assign_DH(peer_tmp, dh) == 0) { 2148 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_SKE_DHE, 2149 ERR_R_EVP_LIB); 2150 goto err; 2151 } 2152 dh = NULL; 2153 2154 if (!ssl_security(s, SSL_SECOP_TMP_DH, EVP_PKEY_security_bits(peer_tmp), 2155 0, peer_tmp)) { 2156 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS_PROCESS_SKE_DHE, 2157 SSL_R_DH_KEY_TOO_SMALL); 2158 goto err; 2159 } 2160 2161 s->s3->peer_tmp = peer_tmp; 2162 2163 /* 2164 * FIXME: This makes assumptions about which ciphersuites come with 2165 * public keys. We should have a less ad-hoc way of doing this 2166 */ 2167 if (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aRSA | SSL_aDSS)) 2168 *pkey = X509_get0_pubkey(s->session->peer); 2169 /* else anonymous DH, so no certificate or pkey. */ 2170 2171 return 1; 2172 2173 err: 2174 BN_free(p); 2175 BN_free(g); 2176 BN_free(bnpub_key); 2177 DH_free(dh); 2178 EVP_PKEY_free(peer_tmp); 2179 2180 return 0; 2181 #else 2182 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_SKE_DHE, 2183 ERR_R_INTERNAL_ERROR); 2184 return 0; 2185 #endif 2186 } 2187 2188 static int tls_process_ske_ecdhe(SSL *s, PACKET *pkt, EVP_PKEY **pkey) 2189 { 2190 #ifndef OPENSSL_NO_EC 2191 PACKET encoded_pt; 2192 unsigned int curve_type, curve_id; 2193 2194 /* 2195 * Extract elliptic curve parameters and the server's ephemeral ECDH 2196 * public key. We only support named (not generic) curves and 2197 * ECParameters in this case is just three bytes. 2198 */ 2199 if (!PACKET_get_1(pkt, &curve_type) || !PACKET_get_net_2(pkt, &curve_id)) { 2200 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_SKE_ECDHE, 2201 SSL_R_LENGTH_TOO_SHORT); 2202 return 0; 2203 } 2204 /* 2205 * Check curve is named curve type and one of our preferences, if not 2206 * server has sent an invalid curve. 2207 */ 2208 if (curve_type != NAMED_CURVE_TYPE 2209 || !tls1_check_group_id(s, curve_id, 1)) { 2210 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PROCESS_SKE_ECDHE, 2211 SSL_R_WRONG_CURVE); 2212 return 0; 2213 } 2214 2215 if ((s->s3->peer_tmp = ssl_generate_param_group(curve_id)) == NULL) { 2216 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_SKE_ECDHE, 2217 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 2218 return 0; 2219 } 2220 2221 if (!PACKET_get_length_prefixed_1(pkt, &encoded_pt)) { 2222 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_SKE_ECDHE, 2223 SSL_R_LENGTH_MISMATCH); 2224 return 0; 2225 } 2226 2227 if (!EVP_PKEY_set1_tls_encodedpoint(s->s3->peer_tmp, 2228 PACKET_data(&encoded_pt), 2229 PACKET_remaining(&encoded_pt))) { 2230 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PROCESS_SKE_ECDHE, 2231 SSL_R_BAD_ECPOINT); 2232 return 0; 2233 } 2234 2235 /* 2236 * The ECC/TLS specification does not mention the use of DSA to sign 2237 * ECParameters in the server key exchange message. We do support RSA 2238 * and ECDSA. 2239 */ 2240 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aECDSA) 2241 *pkey = X509_get0_pubkey(s->session->peer); 2242 else if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aRSA) 2243 *pkey = X509_get0_pubkey(s->session->peer); 2244 /* else anonymous ECDH, so no certificate or pkey. */ 2245 2246 return 1; 2247 #else 2248 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_SKE_ECDHE, 2249 ERR_R_INTERNAL_ERROR); 2250 return 0; 2251 #endif 2252 } 2253 2254 MSG_PROCESS_RETURN tls_process_key_exchange(SSL *s, PACKET *pkt) 2255 { 2256 long alg_k; 2257 EVP_PKEY *pkey = NULL; 2258 EVP_MD_CTX *md_ctx = NULL; 2259 EVP_PKEY_CTX *pctx = NULL; 2260 PACKET save_param_start, signature; 2261 2262 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 2263 2264 save_param_start = *pkt; 2265 2266 #if !defined(OPENSSL_NO_EC) || !defined(OPENSSL_NO_DH) 2267 EVP_PKEY_free(s->s3->peer_tmp); 2268 s->s3->peer_tmp = NULL; 2269 #endif 2270 2271 if (alg_k & SSL_PSK) { 2272 if (!tls_process_ske_psk_preamble(s, pkt)) { 2273 /* SSLfatal() already called */ 2274 goto err; 2275 } 2276 } 2277 2278 /* Nothing else to do for plain PSK or RSAPSK */ 2279 if (alg_k & (SSL_kPSK | SSL_kRSAPSK)) { 2280 } else if (alg_k & SSL_kSRP) { 2281 if (!tls_process_ske_srp(s, pkt, &pkey)) { 2282 /* SSLfatal() already called */ 2283 goto err; 2284 } 2285 } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) { 2286 if (!tls_process_ske_dhe(s, pkt, &pkey)) { 2287 /* SSLfatal() already called */ 2288 goto err; 2289 } 2290 } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) { 2291 if (!tls_process_ske_ecdhe(s, pkt, &pkey)) { 2292 /* SSLfatal() already called */ 2293 goto err; 2294 } 2295 } else if (alg_k) { 2296 SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_TLS_PROCESS_KEY_EXCHANGE, 2297 SSL_R_UNEXPECTED_MESSAGE); 2298 goto err; 2299 } 2300 2301 /* if it was signed, check the signature */ 2302 if (pkey != NULL) { 2303 PACKET params; 2304 int maxsig; 2305 const EVP_MD *md = NULL; 2306 unsigned char *tbs; 2307 size_t tbslen; 2308 int rv; 2309 2310 /* 2311 * |pkt| now points to the beginning of the signature, so the difference 2312 * equals the length of the parameters. 2313 */ 2314 if (!PACKET_get_sub_packet(&save_param_start, ¶ms, 2315 PACKET_remaining(&save_param_start) - 2316 PACKET_remaining(pkt))) { 2317 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_KEY_EXCHANGE, 2318 ERR_R_INTERNAL_ERROR); 2319 goto err; 2320 } 2321 2322 if (SSL_USE_SIGALGS(s)) { 2323 unsigned int sigalg; 2324 2325 if (!PACKET_get_net_2(pkt, &sigalg)) { 2326 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_KEY_EXCHANGE, 2327 SSL_R_LENGTH_TOO_SHORT); 2328 goto err; 2329 } 2330 if (tls12_check_peer_sigalg(s, sigalg, pkey) <=0) { 2331 /* SSLfatal() already called */ 2332 goto err; 2333 } 2334 } else if (!tls1_set_peer_legacy_sigalg(s, pkey)) { 2335 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_KEY_EXCHANGE, 2336 ERR_R_INTERNAL_ERROR); 2337 goto err; 2338 } 2339 2340 if (!tls1_lookup_md(s->s3->tmp.peer_sigalg, &md)) { 2341 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_KEY_EXCHANGE, 2342 ERR_R_INTERNAL_ERROR); 2343 goto err; 2344 } 2345 #ifdef SSL_DEBUG 2346 if (SSL_USE_SIGALGS(s)) 2347 fprintf(stderr, "USING TLSv1.2 HASH %s\n", 2348 md == NULL ? "n/a" : EVP_MD_name(md)); 2349 #endif 2350 2351 if (!PACKET_get_length_prefixed_2(pkt, &signature) 2352 || PACKET_remaining(pkt) != 0) { 2353 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_KEY_EXCHANGE, 2354 SSL_R_LENGTH_MISMATCH); 2355 goto err; 2356 } 2357 maxsig = EVP_PKEY_size(pkey); 2358 if (maxsig < 0) { 2359 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_KEY_EXCHANGE, 2360 ERR_R_INTERNAL_ERROR); 2361 goto err; 2362 } 2363 2364 /* 2365 * Check signature length 2366 */ 2367 if (PACKET_remaining(&signature) > (size_t)maxsig) { 2368 /* wrong packet length */ 2369 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_KEY_EXCHANGE, 2370 SSL_R_WRONG_SIGNATURE_LENGTH); 2371 goto err; 2372 } 2373 2374 md_ctx = EVP_MD_CTX_new(); 2375 if (md_ctx == NULL) { 2376 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_KEY_EXCHANGE, 2377 ERR_R_MALLOC_FAILURE); 2378 goto err; 2379 } 2380 2381 if (EVP_DigestVerifyInit(md_ctx, &pctx, md, NULL, pkey) <= 0) { 2382 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_KEY_EXCHANGE, 2383 ERR_R_EVP_LIB); 2384 goto err; 2385 } 2386 if (SSL_USE_PSS(s)) { 2387 if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0 2388 || EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, 2389 RSA_PSS_SALTLEN_DIGEST) <= 0) { 2390 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2391 SSL_F_TLS_PROCESS_KEY_EXCHANGE, ERR_R_EVP_LIB); 2392 goto err; 2393 } 2394 } 2395 tbslen = construct_key_exchange_tbs(s, &tbs, PACKET_data(¶ms), 2396 PACKET_remaining(¶ms)); 2397 if (tbslen == 0) { 2398 /* SSLfatal() already called */ 2399 goto err; 2400 } 2401 2402 rv = EVP_DigestVerify(md_ctx, PACKET_data(&signature), 2403 PACKET_remaining(&signature), tbs, tbslen); 2404 OPENSSL_free(tbs); 2405 if (rv <= 0) { 2406 SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_F_TLS_PROCESS_KEY_EXCHANGE, 2407 SSL_R_BAD_SIGNATURE); 2408 goto err; 2409 } 2410 EVP_MD_CTX_free(md_ctx); 2411 md_ctx = NULL; 2412 } else { 2413 /* aNULL, aSRP or PSK do not need public keys */ 2414 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP)) 2415 && !(alg_k & SSL_PSK)) { 2416 /* Might be wrong key type, check it */ 2417 if (ssl3_check_cert_and_algorithm(s)) { 2418 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_KEY_EXCHANGE, 2419 SSL_R_BAD_DATA); 2420 } 2421 /* else this shouldn't happen, SSLfatal() already called */ 2422 goto err; 2423 } 2424 /* still data left over */ 2425 if (PACKET_remaining(pkt) != 0) { 2426 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_KEY_EXCHANGE, 2427 SSL_R_EXTRA_DATA_IN_MESSAGE); 2428 goto err; 2429 } 2430 } 2431 2432 return MSG_PROCESS_CONTINUE_READING; 2433 err: 2434 EVP_MD_CTX_free(md_ctx); 2435 return MSG_PROCESS_ERROR; 2436 } 2437 2438 MSG_PROCESS_RETURN tls_process_certificate_request(SSL *s, PACKET *pkt) 2439 { 2440 size_t i; 2441 2442 /* Clear certificate validity flags */ 2443 for (i = 0; i < SSL_PKEY_NUM; i++) 2444 s->s3->tmp.valid_flags[i] = 0; 2445 2446 if (SSL_IS_TLS13(s)) { 2447 PACKET reqctx, extensions; 2448 RAW_EXTENSION *rawexts = NULL; 2449 2450 if ((s->shutdown & SSL_SENT_SHUTDOWN) != 0) { 2451 /* 2452 * We already sent close_notify. This can only happen in TLSv1.3 2453 * post-handshake messages. We can't reasonably respond to this, so 2454 * we just ignore it 2455 */ 2456 return MSG_PROCESS_FINISHED_READING; 2457 } 2458 2459 /* Free and zero certificate types: it is not present in TLS 1.3 */ 2460 OPENSSL_free(s->s3->tmp.ctype); 2461 s->s3->tmp.ctype = NULL; 2462 s->s3->tmp.ctype_len = 0; 2463 OPENSSL_free(s->pha_context); 2464 s->pha_context = NULL; 2465 2466 if (!PACKET_get_length_prefixed_1(pkt, &reqctx) || 2467 !PACKET_memdup(&reqctx, &s->pha_context, &s->pha_context_len)) { 2468 SSLfatal(s, SSL_AD_DECODE_ERROR, 2469 SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, 2470 SSL_R_LENGTH_MISMATCH); 2471 return MSG_PROCESS_ERROR; 2472 } 2473 2474 if (!PACKET_get_length_prefixed_2(pkt, &extensions)) { 2475 SSLfatal(s, SSL_AD_DECODE_ERROR, 2476 SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, 2477 SSL_R_BAD_LENGTH); 2478 return MSG_PROCESS_ERROR; 2479 } 2480 if (!tls_collect_extensions(s, &extensions, 2481 SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, 2482 &rawexts, NULL, 1) 2483 || !tls_parse_all_extensions(s, SSL_EXT_TLS1_3_CERTIFICATE_REQUEST, 2484 rawexts, NULL, 0, 1)) { 2485 /* SSLfatal() already called */ 2486 OPENSSL_free(rawexts); 2487 return MSG_PROCESS_ERROR; 2488 } 2489 OPENSSL_free(rawexts); 2490 if (!tls1_process_sigalgs(s)) { 2491 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2492 SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, 2493 SSL_R_BAD_LENGTH); 2494 return MSG_PROCESS_ERROR; 2495 } 2496 } else { 2497 PACKET ctypes; 2498 2499 /* get the certificate types */ 2500 if (!PACKET_get_length_prefixed_1(pkt, &ctypes)) { 2501 SSLfatal(s, SSL_AD_DECODE_ERROR, 2502 SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, 2503 SSL_R_LENGTH_MISMATCH); 2504 return MSG_PROCESS_ERROR; 2505 } 2506 2507 if (!PACKET_memdup(&ctypes, &s->s3->tmp.ctype, &s->s3->tmp.ctype_len)) { 2508 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2509 SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, 2510 ERR_R_INTERNAL_ERROR); 2511 return MSG_PROCESS_ERROR; 2512 } 2513 2514 if (SSL_USE_SIGALGS(s)) { 2515 PACKET sigalgs; 2516 2517 if (!PACKET_get_length_prefixed_2(pkt, &sigalgs)) { 2518 SSLfatal(s, SSL_AD_DECODE_ERROR, 2519 SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, 2520 SSL_R_LENGTH_MISMATCH); 2521 return MSG_PROCESS_ERROR; 2522 } 2523 2524 /* 2525 * Despite this being for certificates, preserve compatibility 2526 * with pre-TLS 1.3 and use the regular sigalgs field. 2527 */ 2528 if (!tls1_save_sigalgs(s, &sigalgs, 0)) { 2529 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2530 SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, 2531 SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2532 return MSG_PROCESS_ERROR; 2533 } 2534 if (!tls1_process_sigalgs(s)) { 2535 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2536 SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, 2537 ERR_R_MALLOC_FAILURE); 2538 return MSG_PROCESS_ERROR; 2539 } 2540 } 2541 2542 /* get the CA RDNs */ 2543 if (!parse_ca_names(s, pkt)) { 2544 /* SSLfatal() already called */ 2545 return MSG_PROCESS_ERROR; 2546 } 2547 } 2548 2549 if (PACKET_remaining(pkt) != 0) { 2550 SSLfatal(s, SSL_AD_DECODE_ERROR, 2551 SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, 2552 SSL_R_LENGTH_MISMATCH); 2553 return MSG_PROCESS_ERROR; 2554 } 2555 2556 /* we should setup a certificate to return.... */ 2557 s->s3->tmp.cert_req = 1; 2558 2559 /* 2560 * In TLSv1.3 we don't prepare the client certificate yet. We wait until 2561 * after the CertificateVerify message has been received. This is because 2562 * in TLSv1.3 the CertificateRequest arrives before the Certificate message 2563 * but in TLSv1.2 it is the other way around. We want to make sure that 2564 * SSL_get_peer_certificate() returns something sensible in 2565 * client_cert_cb. 2566 */ 2567 if (SSL_IS_TLS13(s) && s->post_handshake_auth != SSL_PHA_REQUESTED) 2568 return MSG_PROCESS_CONTINUE_READING; 2569 2570 return MSG_PROCESS_CONTINUE_PROCESSING; 2571 } 2572 2573 MSG_PROCESS_RETURN tls_process_new_session_ticket(SSL *s, PACKET *pkt) 2574 { 2575 unsigned int ticklen; 2576 unsigned long ticket_lifetime_hint, age_add = 0; 2577 unsigned int sess_len; 2578 RAW_EXTENSION *exts = NULL; 2579 PACKET nonce; 2580 2581 PACKET_null_init(&nonce); 2582 2583 if (!PACKET_get_net_4(pkt, &ticket_lifetime_hint) 2584 || (SSL_IS_TLS13(s) 2585 && (!PACKET_get_net_4(pkt, &age_add) 2586 || !PACKET_get_length_prefixed_1(pkt, &nonce))) 2587 || !PACKET_get_net_2(pkt, &ticklen) 2588 || (SSL_IS_TLS13(s) ? (ticklen == 0 || PACKET_remaining(pkt) < ticklen) 2589 : PACKET_remaining(pkt) != ticklen)) { 2590 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, 2591 SSL_R_LENGTH_MISMATCH); 2592 goto err; 2593 } 2594 2595 /* 2596 * Server is allowed to change its mind (in <=TLSv1.2) and send an empty 2597 * ticket. We already checked this TLSv1.3 case above, so it should never 2598 * be 0 here in that instance 2599 */ 2600 if (ticklen == 0) 2601 return MSG_PROCESS_CONTINUE_READING; 2602 2603 /* 2604 * Sessions must be immutable once they go into the session cache. Otherwise 2605 * we can get multi-thread problems. Therefore we don't "update" sessions, 2606 * we replace them with a duplicate. In TLSv1.3 we need to do this every 2607 * time a NewSessionTicket arrives because those messages arrive 2608 * post-handshake and the session may have already gone into the session 2609 * cache. 2610 */ 2611 if (SSL_IS_TLS13(s) || s->session->session_id_length > 0) { 2612 SSL_SESSION *new_sess; 2613 2614 /* 2615 * We reused an existing session, so we need to replace it with a new 2616 * one 2617 */ 2618 if ((new_sess = ssl_session_dup(s->session, 0)) == 0) { 2619 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2620 SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, 2621 ERR_R_MALLOC_FAILURE); 2622 goto err; 2623 } 2624 2625 if ((s->session_ctx->session_cache_mode & SSL_SESS_CACHE_CLIENT) != 0 2626 && !SSL_IS_TLS13(s)) { 2627 /* 2628 * In TLSv1.2 and below the arrival of a new tickets signals that 2629 * any old ticket we were using is now out of date, so we remove the 2630 * old session from the cache. We carry on if this fails 2631 */ 2632 SSL_CTX_remove_session(s->session_ctx, s->session); 2633 } 2634 2635 SSL_SESSION_free(s->session); 2636 s->session = new_sess; 2637 } 2638 2639 /* 2640 * Technically the cast to long here is not guaranteed by the C standard - 2641 * but we use it elsewhere, so this should be ok. 2642 */ 2643 s->session->time = (long)time(NULL); 2644 2645 OPENSSL_free(s->session->ext.tick); 2646 s->session->ext.tick = NULL; 2647 s->session->ext.ticklen = 0; 2648 2649 s->session->ext.tick = OPENSSL_malloc(ticklen); 2650 if (s->session->ext.tick == NULL) { 2651 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, 2652 ERR_R_MALLOC_FAILURE); 2653 goto err; 2654 } 2655 if (!PACKET_copy_bytes(pkt, s->session->ext.tick, ticklen)) { 2656 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, 2657 SSL_R_LENGTH_MISMATCH); 2658 goto err; 2659 } 2660 2661 s->session->ext.tick_lifetime_hint = ticket_lifetime_hint; 2662 s->session->ext.tick_age_add = age_add; 2663 s->session->ext.ticklen = ticklen; 2664 2665 if (SSL_IS_TLS13(s)) { 2666 PACKET extpkt; 2667 2668 if (!PACKET_as_length_prefixed_2(pkt, &extpkt) 2669 || PACKET_remaining(pkt) != 0) { 2670 SSLfatal(s, SSL_AD_DECODE_ERROR, 2671 SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, 2672 SSL_R_LENGTH_MISMATCH); 2673 goto err; 2674 } 2675 2676 if (!tls_collect_extensions(s, &extpkt, 2677 SSL_EXT_TLS1_3_NEW_SESSION_TICKET, &exts, 2678 NULL, 1) 2679 || !tls_parse_all_extensions(s, 2680 SSL_EXT_TLS1_3_NEW_SESSION_TICKET, 2681 exts, NULL, 0, 1)) { 2682 /* SSLfatal() already called */ 2683 goto err; 2684 } 2685 } 2686 2687 /* 2688 * There are two ways to detect a resumed ticket session. One is to set 2689 * an appropriate session ID and then the server must return a match in 2690 * ServerHello. This allows the normal client session ID matching to work 2691 * and we know much earlier that the ticket has been accepted. The 2692 * other way is to set zero length session ID when the ticket is 2693 * presented and rely on the handshake to determine session resumption. 2694 * We choose the former approach because this fits in with assumptions 2695 * elsewhere in OpenSSL. The session ID is set to the SHA256 (or SHA1 is 2696 * SHA256 is disabled) hash of the ticket. 2697 */ 2698 /* 2699 * TODO(size_t): we use sess_len here because EVP_Digest expects an int 2700 * but s->session->session_id_length is a size_t 2701 */ 2702 if (!EVP_Digest(s->session->ext.tick, ticklen, 2703 s->session->session_id, &sess_len, 2704 EVP_sha256(), NULL)) { 2705 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, 2706 ERR_R_EVP_LIB); 2707 goto err; 2708 } 2709 s->session->session_id_length = sess_len; 2710 s->session->not_resumable = 0; 2711 2712 /* This is a standalone message in TLSv1.3, so there is no more to read */ 2713 if (SSL_IS_TLS13(s)) { 2714 const EVP_MD *md = ssl_handshake_md(s); 2715 int hashleni = EVP_MD_size(md); 2716 size_t hashlen; 2717 static const unsigned char nonce_label[] = "resumption"; 2718 2719 /* Ensure cast to size_t is safe */ 2720 if (!ossl_assert(hashleni >= 0)) { 2721 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2722 SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, 2723 ERR_R_INTERNAL_ERROR); 2724 goto err; 2725 } 2726 hashlen = (size_t)hashleni; 2727 2728 if (!tls13_hkdf_expand(s, md, s->resumption_master_secret, 2729 nonce_label, 2730 sizeof(nonce_label) - 1, 2731 PACKET_data(&nonce), 2732 PACKET_remaining(&nonce), 2733 s->session->master_key, 2734 hashlen, 1)) { 2735 /* SSLfatal() already called */ 2736 goto err; 2737 } 2738 s->session->master_key_length = hashlen; 2739 2740 OPENSSL_free(exts); 2741 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 2742 return MSG_PROCESS_FINISHED_READING; 2743 } 2744 2745 return MSG_PROCESS_CONTINUE_READING; 2746 err: 2747 OPENSSL_free(exts); 2748 return MSG_PROCESS_ERROR; 2749 } 2750 2751 /* 2752 * In TLSv1.3 this is called from the extensions code, otherwise it is used to 2753 * parse a separate message. Returns 1 on success or 0 on failure 2754 */ 2755 int tls_process_cert_status_body(SSL *s, PACKET *pkt) 2756 { 2757 size_t resplen; 2758 unsigned int type; 2759 2760 if (!PACKET_get_1(pkt, &type) 2761 || type != TLSEXT_STATUSTYPE_ocsp) { 2762 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CERT_STATUS_BODY, 2763 SSL_R_UNSUPPORTED_STATUS_TYPE); 2764 return 0; 2765 } 2766 if (!PACKET_get_net_3_len(pkt, &resplen) 2767 || PACKET_remaining(pkt) != resplen) { 2768 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CERT_STATUS_BODY, 2769 SSL_R_LENGTH_MISMATCH); 2770 return 0; 2771 } 2772 s->ext.ocsp.resp = OPENSSL_malloc(resplen); 2773 if (s->ext.ocsp.resp == NULL) { 2774 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_STATUS_BODY, 2775 ERR_R_MALLOC_FAILURE); 2776 return 0; 2777 } 2778 if (!PACKET_copy_bytes(pkt, s->ext.ocsp.resp, resplen)) { 2779 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CERT_STATUS_BODY, 2780 SSL_R_LENGTH_MISMATCH); 2781 return 0; 2782 } 2783 s->ext.ocsp.resp_len = resplen; 2784 2785 return 1; 2786 } 2787 2788 2789 MSG_PROCESS_RETURN tls_process_cert_status(SSL *s, PACKET *pkt) 2790 { 2791 if (!tls_process_cert_status_body(s, pkt)) { 2792 /* SSLfatal() already called */ 2793 return MSG_PROCESS_ERROR; 2794 } 2795 2796 return MSG_PROCESS_CONTINUE_READING; 2797 } 2798 2799 /* 2800 * Perform miscellaneous checks and processing after we have received the 2801 * server's initial flight. In TLS1.3 this is after the Server Finished message. 2802 * In <=TLS1.2 this is after the ServerDone message. Returns 1 on success or 0 2803 * on failure. 2804 */ 2805 int tls_process_initial_server_flight(SSL *s) 2806 { 2807 /* 2808 * at this point we check that we have the required stuff from 2809 * the server 2810 */ 2811 if (!ssl3_check_cert_and_algorithm(s)) { 2812 /* SSLfatal() already called */ 2813 return 0; 2814 } 2815 2816 /* 2817 * Call the ocsp status callback if needed. The |ext.ocsp.resp| and 2818 * |ext.ocsp.resp_len| values will be set if we actually received a status 2819 * message, or NULL and -1 otherwise 2820 */ 2821 if (s->ext.status_type != TLSEXT_STATUSTYPE_nothing 2822 && s->ctx->ext.status_cb != NULL) { 2823 int ret = s->ctx->ext.status_cb(s, s->ctx->ext.status_arg); 2824 2825 if (ret == 0) { 2826 SSLfatal(s, SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE, 2827 SSL_F_TLS_PROCESS_INITIAL_SERVER_FLIGHT, 2828 SSL_R_INVALID_STATUS_RESPONSE); 2829 return 0; 2830 } 2831 if (ret < 0) { 2832 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 2833 SSL_F_TLS_PROCESS_INITIAL_SERVER_FLIGHT, 2834 ERR_R_MALLOC_FAILURE); 2835 return 0; 2836 } 2837 } 2838 #ifndef OPENSSL_NO_CT 2839 if (s->ct_validation_callback != NULL) { 2840 /* Note we validate the SCTs whether or not we abort on error */ 2841 if (!ssl_validate_ct(s) && (s->verify_mode & SSL_VERIFY_PEER)) { 2842 /* SSLfatal() already called */ 2843 return 0; 2844 } 2845 } 2846 #endif 2847 2848 return 1; 2849 } 2850 2851 MSG_PROCESS_RETURN tls_process_server_done(SSL *s, PACKET *pkt) 2852 { 2853 if (PACKET_remaining(pkt) > 0) { 2854 /* should contain no data */ 2855 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_SERVER_DONE, 2856 SSL_R_LENGTH_MISMATCH); 2857 return MSG_PROCESS_ERROR; 2858 } 2859 #ifndef OPENSSL_NO_SRP 2860 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) { 2861 if (SRP_Calc_A_param(s) <= 0) { 2862 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_SERVER_DONE, 2863 SSL_R_SRP_A_CALC); 2864 return MSG_PROCESS_ERROR; 2865 } 2866 } 2867 #endif 2868 2869 if (!tls_process_initial_server_flight(s)) { 2870 /* SSLfatal() already called */ 2871 return MSG_PROCESS_ERROR; 2872 } 2873 2874 return MSG_PROCESS_FINISHED_READING; 2875 } 2876 2877 static int tls_construct_cke_psk_preamble(SSL *s, WPACKET *pkt) 2878 { 2879 #ifndef OPENSSL_NO_PSK 2880 int ret = 0; 2881 /* 2882 * The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes to return a 2883 * \0-terminated identity. The last byte is for us for simulating 2884 * strnlen. 2885 */ 2886 char identity[PSK_MAX_IDENTITY_LEN + 1]; 2887 size_t identitylen = 0; 2888 unsigned char psk[PSK_MAX_PSK_LEN]; 2889 unsigned char *tmppsk = NULL; 2890 char *tmpidentity = NULL; 2891 size_t psklen = 0; 2892 2893 if (s->psk_client_callback == NULL) { 2894 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, 2895 SSL_R_PSK_NO_CLIENT_CB); 2896 goto err; 2897 } 2898 2899 memset(identity, 0, sizeof(identity)); 2900 2901 psklen = s->psk_client_callback(s, s->session->psk_identity_hint, 2902 identity, sizeof(identity) - 1, 2903 psk, sizeof(psk)); 2904 2905 if (psklen > PSK_MAX_PSK_LEN) { 2906 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 2907 SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR); 2908 goto err; 2909 } else if (psklen == 0) { 2910 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 2911 SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, 2912 SSL_R_PSK_IDENTITY_NOT_FOUND); 2913 goto err; 2914 } 2915 2916 identitylen = strlen(identity); 2917 if (identitylen > PSK_MAX_IDENTITY_LEN) { 2918 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, 2919 ERR_R_INTERNAL_ERROR); 2920 goto err; 2921 } 2922 2923 tmppsk = OPENSSL_memdup(psk, psklen); 2924 tmpidentity = OPENSSL_strdup(identity); 2925 if (tmppsk == NULL || tmpidentity == NULL) { 2926 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, 2927 ERR_R_MALLOC_FAILURE); 2928 goto err; 2929 } 2930 2931 OPENSSL_free(s->s3->tmp.psk); 2932 s->s3->tmp.psk = tmppsk; 2933 s->s3->tmp.psklen = psklen; 2934 tmppsk = NULL; 2935 OPENSSL_free(s->session->psk_identity); 2936 s->session->psk_identity = tmpidentity; 2937 tmpidentity = NULL; 2938 2939 if (!WPACKET_sub_memcpy_u16(pkt, identity, identitylen)) { 2940 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, 2941 ERR_R_INTERNAL_ERROR); 2942 goto err; 2943 } 2944 2945 ret = 1; 2946 2947 err: 2948 OPENSSL_cleanse(psk, psklen); 2949 OPENSSL_cleanse(identity, sizeof(identity)); 2950 OPENSSL_clear_free(tmppsk, psklen); 2951 OPENSSL_clear_free(tmpidentity, identitylen); 2952 2953 return ret; 2954 #else 2955 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, 2956 ERR_R_INTERNAL_ERROR); 2957 return 0; 2958 #endif 2959 } 2960 2961 static int tls_construct_cke_rsa(SSL *s, WPACKET *pkt) 2962 { 2963 #ifndef OPENSSL_NO_RSA 2964 unsigned char *encdata = NULL; 2965 EVP_PKEY *pkey = NULL; 2966 EVP_PKEY_CTX *pctx = NULL; 2967 size_t enclen; 2968 unsigned char *pms = NULL; 2969 size_t pmslen = 0; 2970 2971 if (s->session->peer == NULL) { 2972 /* 2973 * We should always have a server certificate with SSL_kRSA. 2974 */ 2975 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_RSA, 2976 ERR_R_INTERNAL_ERROR); 2977 return 0; 2978 } 2979 2980 pkey = X509_get0_pubkey(s->session->peer); 2981 if (EVP_PKEY_get0_RSA(pkey) == NULL) { 2982 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_RSA, 2983 ERR_R_INTERNAL_ERROR); 2984 return 0; 2985 } 2986 2987 pmslen = SSL_MAX_MASTER_KEY_LENGTH; 2988 pms = OPENSSL_malloc(pmslen); 2989 if (pms == NULL) { 2990 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_RSA, 2991 ERR_R_MALLOC_FAILURE); 2992 return 0; 2993 } 2994 2995 pms[0] = s->client_version >> 8; 2996 pms[1] = s->client_version & 0xff; 2997 /* TODO(size_t): Convert this function */ 2998 if (RAND_bytes(pms + 2, (int)(pmslen - 2)) <= 0) { 2999 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_RSA, 3000 ERR_R_MALLOC_FAILURE); 3001 goto err; 3002 } 3003 3004 /* Fix buf for TLS and beyond */ 3005 if (s->version > SSL3_VERSION && !WPACKET_start_sub_packet_u16(pkt)) { 3006 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_RSA, 3007 ERR_R_INTERNAL_ERROR); 3008 goto err; 3009 } 3010 pctx = EVP_PKEY_CTX_new(pkey, NULL); 3011 if (pctx == NULL || EVP_PKEY_encrypt_init(pctx) <= 0 3012 || EVP_PKEY_encrypt(pctx, NULL, &enclen, pms, pmslen) <= 0) { 3013 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_RSA, 3014 ERR_R_EVP_LIB); 3015 goto err; 3016 } 3017 if (!WPACKET_allocate_bytes(pkt, enclen, &encdata) 3018 || EVP_PKEY_encrypt(pctx, encdata, &enclen, pms, pmslen) <= 0) { 3019 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_RSA, 3020 SSL_R_BAD_RSA_ENCRYPT); 3021 goto err; 3022 } 3023 EVP_PKEY_CTX_free(pctx); 3024 pctx = NULL; 3025 3026 /* Fix buf for TLS and beyond */ 3027 if (s->version > SSL3_VERSION && !WPACKET_close(pkt)) { 3028 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_RSA, 3029 ERR_R_INTERNAL_ERROR); 3030 goto err; 3031 } 3032 3033 /* Log the premaster secret, if logging is enabled. */ 3034 if (!ssl_log_rsa_client_key_exchange(s, encdata, enclen, pms, pmslen)) { 3035 /* SSLfatal() already called */ 3036 goto err; 3037 } 3038 3039 s->s3->tmp.pms = pms; 3040 s->s3->tmp.pmslen = pmslen; 3041 3042 return 1; 3043 err: 3044 OPENSSL_clear_free(pms, pmslen); 3045 EVP_PKEY_CTX_free(pctx); 3046 3047 return 0; 3048 #else 3049 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_RSA, 3050 ERR_R_INTERNAL_ERROR); 3051 return 0; 3052 #endif 3053 } 3054 3055 static int tls_construct_cke_dhe(SSL *s, WPACKET *pkt) 3056 { 3057 #ifndef OPENSSL_NO_DH 3058 DH *dh_clnt = NULL; 3059 const BIGNUM *pub_key; 3060 EVP_PKEY *ckey = NULL, *skey = NULL; 3061 unsigned char *keybytes = NULL; 3062 3063 skey = s->s3->peer_tmp; 3064 if (skey == NULL) { 3065 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_DHE, 3066 ERR_R_INTERNAL_ERROR); 3067 goto err; 3068 } 3069 3070 ckey = ssl_generate_pkey(skey); 3071 if (ckey == NULL) { 3072 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_DHE, 3073 ERR_R_INTERNAL_ERROR); 3074 goto err; 3075 } 3076 3077 dh_clnt = EVP_PKEY_get0_DH(ckey); 3078 3079 if (dh_clnt == NULL) { 3080 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_DHE, 3081 ERR_R_INTERNAL_ERROR); 3082 goto err; 3083 } 3084 3085 if (ssl_derive(s, ckey, skey, 0) == 0) { 3086 /* SSLfatal() already called */ 3087 goto err; 3088 } 3089 3090 /* send off the data */ 3091 DH_get0_key(dh_clnt, &pub_key, NULL); 3092 if (!WPACKET_sub_allocate_bytes_u16(pkt, BN_num_bytes(pub_key), 3093 &keybytes)) { 3094 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_DHE, 3095 ERR_R_INTERNAL_ERROR); 3096 goto err; 3097 } 3098 3099 BN_bn2bin(pub_key, keybytes); 3100 EVP_PKEY_free(ckey); 3101 3102 return 1; 3103 err: 3104 EVP_PKEY_free(ckey); 3105 return 0; 3106 #else 3107 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_DHE, 3108 ERR_R_INTERNAL_ERROR); 3109 return 0; 3110 #endif 3111 } 3112 3113 static int tls_construct_cke_ecdhe(SSL *s, WPACKET *pkt) 3114 { 3115 #ifndef OPENSSL_NO_EC 3116 unsigned char *encodedPoint = NULL; 3117 size_t encoded_pt_len = 0; 3118 EVP_PKEY *ckey = NULL, *skey = NULL; 3119 int ret = 0; 3120 3121 skey = s->s3->peer_tmp; 3122 if (skey == NULL) { 3123 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_ECDHE, 3124 ERR_R_INTERNAL_ERROR); 3125 return 0; 3126 } 3127 3128 ckey = ssl_generate_pkey(skey); 3129 if (ckey == NULL) { 3130 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_ECDHE, 3131 ERR_R_MALLOC_FAILURE); 3132 goto err; 3133 } 3134 3135 if (ssl_derive(s, ckey, skey, 0) == 0) { 3136 /* SSLfatal() already called */ 3137 goto err; 3138 } 3139 3140 /* Generate encoding of client key */ 3141 encoded_pt_len = EVP_PKEY_get1_tls_encodedpoint(ckey, &encodedPoint); 3142 3143 if (encoded_pt_len == 0) { 3144 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_ECDHE, 3145 ERR_R_EC_LIB); 3146 goto err; 3147 } 3148 3149 if (!WPACKET_sub_memcpy_u8(pkt, encodedPoint, encoded_pt_len)) { 3150 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_ECDHE, 3151 ERR_R_INTERNAL_ERROR); 3152 goto err; 3153 } 3154 3155 ret = 1; 3156 err: 3157 OPENSSL_free(encodedPoint); 3158 EVP_PKEY_free(ckey); 3159 return ret; 3160 #else 3161 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_ECDHE, 3162 ERR_R_INTERNAL_ERROR); 3163 return 0; 3164 #endif 3165 } 3166 3167 static int tls_construct_cke_gost(SSL *s, WPACKET *pkt) 3168 { 3169 #ifndef OPENSSL_NO_GOST 3170 /* GOST key exchange message creation */ 3171 EVP_PKEY_CTX *pkey_ctx = NULL; 3172 X509 *peer_cert; 3173 size_t msglen; 3174 unsigned int md_len; 3175 unsigned char shared_ukm[32], tmp[256]; 3176 EVP_MD_CTX *ukm_hash = NULL; 3177 int dgst_nid = NID_id_GostR3411_94; 3178 unsigned char *pms = NULL; 3179 size_t pmslen = 0; 3180 3181 if ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aGOST12) != 0) 3182 dgst_nid = NID_id_GostR3411_2012_256; 3183 3184 /* 3185 * Get server certificate PKEY and create ctx from it 3186 */ 3187 peer_cert = s->session->peer; 3188 if (!peer_cert) { 3189 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS_CONSTRUCT_CKE_GOST, 3190 SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 3191 return 0; 3192 } 3193 3194 pkey_ctx = EVP_PKEY_CTX_new(X509_get0_pubkey(peer_cert), NULL); 3195 if (pkey_ctx == NULL) { 3196 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_GOST, 3197 ERR_R_MALLOC_FAILURE); 3198 return 0; 3199 } 3200 /* 3201 * If we have send a certificate, and certificate key 3202 * parameters match those of server certificate, use 3203 * certificate key for key exchange 3204 */ 3205 3206 /* Otherwise, generate ephemeral key pair */ 3207 pmslen = 32; 3208 pms = OPENSSL_malloc(pmslen); 3209 if (pms == NULL) { 3210 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_GOST, 3211 ERR_R_MALLOC_FAILURE); 3212 goto err; 3213 } 3214 3215 if (EVP_PKEY_encrypt_init(pkey_ctx) <= 0 3216 /* Generate session key 3217 * TODO(size_t): Convert this function 3218 */ 3219 || RAND_bytes(pms, (int)pmslen) <= 0) { 3220 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_GOST, 3221 ERR_R_INTERNAL_ERROR); 3222 goto err; 3223 }; 3224 /* 3225 * Compute shared IV and store it in algorithm-specific context 3226 * data 3227 */ 3228 ukm_hash = EVP_MD_CTX_new(); 3229 if (ukm_hash == NULL 3230 || EVP_DigestInit(ukm_hash, EVP_get_digestbynid(dgst_nid)) <= 0 3231 || EVP_DigestUpdate(ukm_hash, s->s3->client_random, 3232 SSL3_RANDOM_SIZE) <= 0 3233 || EVP_DigestUpdate(ukm_hash, s->s3->server_random, 3234 SSL3_RANDOM_SIZE) <= 0 3235 || EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len) <= 0) { 3236 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_GOST, 3237 ERR_R_INTERNAL_ERROR); 3238 goto err; 3239 } 3240 EVP_MD_CTX_free(ukm_hash); 3241 ukm_hash = NULL; 3242 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 3243 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 3244 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_GOST, 3245 SSL_R_LIBRARY_BUG); 3246 goto err; 3247 } 3248 /* Make GOST keytransport blob message */ 3249 /* 3250 * Encapsulate it into sequence 3251 */ 3252 msglen = 255; 3253 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, pms, pmslen) <= 0) { 3254 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_GOST, 3255 SSL_R_LIBRARY_BUG); 3256 goto err; 3257 } 3258 3259 if (!WPACKET_put_bytes_u8(pkt, V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED) 3260 || (msglen >= 0x80 && !WPACKET_put_bytes_u8(pkt, 0x81)) 3261 || !WPACKET_sub_memcpy_u8(pkt, tmp, msglen)) { 3262 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_GOST, 3263 ERR_R_INTERNAL_ERROR); 3264 goto err; 3265 } 3266 3267 EVP_PKEY_CTX_free(pkey_ctx); 3268 s->s3->tmp.pms = pms; 3269 s->s3->tmp.pmslen = pmslen; 3270 3271 return 1; 3272 err: 3273 EVP_PKEY_CTX_free(pkey_ctx); 3274 OPENSSL_clear_free(pms, pmslen); 3275 EVP_MD_CTX_free(ukm_hash); 3276 return 0; 3277 #else 3278 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_GOST, 3279 ERR_R_INTERNAL_ERROR); 3280 return 0; 3281 #endif 3282 } 3283 3284 static int tls_construct_cke_srp(SSL *s, WPACKET *pkt) 3285 { 3286 #ifndef OPENSSL_NO_SRP 3287 unsigned char *abytes = NULL; 3288 3289 if (s->srp_ctx.A == NULL 3290 || !WPACKET_sub_allocate_bytes_u16(pkt, BN_num_bytes(s->srp_ctx.A), 3291 &abytes)) { 3292 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_SRP, 3293 ERR_R_INTERNAL_ERROR); 3294 return 0; 3295 } 3296 BN_bn2bin(s->srp_ctx.A, abytes); 3297 3298 OPENSSL_free(s->session->srp_username); 3299 s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login); 3300 if (s->session->srp_username == NULL) { 3301 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_SRP, 3302 ERR_R_MALLOC_FAILURE); 3303 return 0; 3304 } 3305 3306 return 1; 3307 #else 3308 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CKE_SRP, 3309 ERR_R_INTERNAL_ERROR); 3310 return 0; 3311 #endif 3312 } 3313 3314 int tls_construct_client_key_exchange(SSL *s, WPACKET *pkt) 3315 { 3316 unsigned long alg_k; 3317 3318 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 3319 3320 /* 3321 * All of the construct functions below call SSLfatal() if necessary so 3322 * no need to do so here. 3323 */ 3324 if ((alg_k & SSL_PSK) 3325 && !tls_construct_cke_psk_preamble(s, pkt)) 3326 goto err; 3327 3328 if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) { 3329 if (!tls_construct_cke_rsa(s, pkt)) 3330 goto err; 3331 } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) { 3332 if (!tls_construct_cke_dhe(s, pkt)) 3333 goto err; 3334 } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) { 3335 if (!tls_construct_cke_ecdhe(s, pkt)) 3336 goto err; 3337 } else if (alg_k & SSL_kGOST) { 3338 if (!tls_construct_cke_gost(s, pkt)) 3339 goto err; 3340 } else if (alg_k & SSL_kSRP) { 3341 if (!tls_construct_cke_srp(s, pkt)) 3342 goto err; 3343 } else if (!(alg_k & SSL_kPSK)) { 3344 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3345 SSL_F_TLS_CONSTRUCT_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 3346 goto err; 3347 } 3348 3349 return 1; 3350 err: 3351 OPENSSL_clear_free(s->s3->tmp.pms, s->s3->tmp.pmslen); 3352 s->s3->tmp.pms = NULL; 3353 #ifndef OPENSSL_NO_PSK 3354 OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen); 3355 s->s3->tmp.psk = NULL; 3356 #endif 3357 return 0; 3358 } 3359 3360 int tls_client_key_exchange_post_work(SSL *s) 3361 { 3362 unsigned char *pms = NULL; 3363 size_t pmslen = 0; 3364 3365 pms = s->s3->tmp.pms; 3366 pmslen = s->s3->tmp.pmslen; 3367 3368 #ifndef OPENSSL_NO_SRP 3369 /* Check for SRP */ 3370 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) { 3371 if (!srp_generate_client_master_secret(s)) { 3372 /* SSLfatal() already called */ 3373 goto err; 3374 } 3375 return 1; 3376 } 3377 #endif 3378 3379 if (pms == NULL && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 3380 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3381 SSL_F_TLS_CLIENT_KEY_EXCHANGE_POST_WORK, ERR_R_MALLOC_FAILURE); 3382 goto err; 3383 } 3384 if (!ssl_generate_master_secret(s, pms, pmslen, 1)) { 3385 /* SSLfatal() already called */ 3386 /* ssl_generate_master_secret frees the pms even on error */ 3387 pms = NULL; 3388 pmslen = 0; 3389 goto err; 3390 } 3391 pms = NULL; 3392 pmslen = 0; 3393 3394 #ifndef OPENSSL_NO_SCTP 3395 if (SSL_IS_DTLS(s)) { 3396 unsigned char sctpauthkey[64]; 3397 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; 3398 size_t labellen; 3399 3400 /* 3401 * Add new shared key for SCTP-Auth, will be ignored if no SCTP 3402 * used. 3403 */ 3404 memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL, 3405 sizeof(DTLS1_SCTP_AUTH_LABEL)); 3406 3407 /* Don't include the terminating zero. */ 3408 labellen = sizeof(labelbuffer) - 1; 3409 if (s->mode & SSL_MODE_DTLS_SCTP_LABEL_LENGTH_BUG) 3410 labellen += 1; 3411 3412 if (SSL_export_keying_material(s, sctpauthkey, 3413 sizeof(sctpauthkey), labelbuffer, 3414 labellen, NULL, 0, 0) <= 0) { 3415 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3416 SSL_F_TLS_CLIENT_KEY_EXCHANGE_POST_WORK, 3417 ERR_R_INTERNAL_ERROR); 3418 goto err; 3419 } 3420 3421 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 3422 sizeof(sctpauthkey), sctpauthkey); 3423 } 3424 #endif 3425 3426 return 1; 3427 err: 3428 OPENSSL_clear_free(pms, pmslen); 3429 s->s3->tmp.pms = NULL; 3430 return 0; 3431 } 3432 3433 /* 3434 * Check a certificate can be used for client authentication. Currently check 3435 * cert exists, if we have a suitable digest for TLS 1.2 if static DH client 3436 * certificates can be used and optionally checks suitability for Suite B. 3437 */ 3438 static int ssl3_check_client_certificate(SSL *s) 3439 { 3440 /* If no suitable signature algorithm can't use certificate */ 3441 if (!tls_choose_sigalg(s, 0) || s->s3->tmp.sigalg == NULL) 3442 return 0; 3443 /* 3444 * If strict mode check suitability of chain before using it. This also 3445 * adjusts suite B digest if necessary. 3446 */ 3447 if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT && 3448 !tls1_check_chain(s, NULL, NULL, NULL, -2)) 3449 return 0; 3450 return 1; 3451 } 3452 3453 WORK_STATE tls_prepare_client_certificate(SSL *s, WORK_STATE wst) 3454 { 3455 X509 *x509 = NULL; 3456 EVP_PKEY *pkey = NULL; 3457 int i; 3458 3459 if (wst == WORK_MORE_A) { 3460 /* Let cert callback update client certificates if required */ 3461 if (s->cert->cert_cb) { 3462 i = s->cert->cert_cb(s, s->cert->cert_cb_arg); 3463 if (i < 0) { 3464 s->rwstate = SSL_X509_LOOKUP; 3465 return WORK_MORE_A; 3466 } 3467 if (i == 0) { 3468 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3469 SSL_F_TLS_PREPARE_CLIENT_CERTIFICATE, 3470 SSL_R_CALLBACK_FAILED); 3471 return WORK_ERROR; 3472 } 3473 s->rwstate = SSL_NOTHING; 3474 } 3475 if (ssl3_check_client_certificate(s)) { 3476 if (s->post_handshake_auth == SSL_PHA_REQUESTED) { 3477 return WORK_FINISHED_STOP; 3478 } 3479 return WORK_FINISHED_CONTINUE; 3480 } 3481 3482 /* Fall through to WORK_MORE_B */ 3483 wst = WORK_MORE_B; 3484 } 3485 3486 /* We need to get a client cert */ 3487 if (wst == WORK_MORE_B) { 3488 /* 3489 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP; 3490 * return(-1); We then get retied later 3491 */ 3492 i = ssl_do_client_cert_cb(s, &x509, &pkey); 3493 if (i < 0) { 3494 s->rwstate = SSL_X509_LOOKUP; 3495 return WORK_MORE_B; 3496 } 3497 s->rwstate = SSL_NOTHING; 3498 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 3499 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey)) 3500 i = 0; 3501 } else if (i == 1) { 3502 i = 0; 3503 SSLerr(SSL_F_TLS_PREPARE_CLIENT_CERTIFICATE, 3504 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 3505 } 3506 3507 X509_free(x509); 3508 EVP_PKEY_free(pkey); 3509 if (i && !ssl3_check_client_certificate(s)) 3510 i = 0; 3511 if (i == 0) { 3512 if (s->version == SSL3_VERSION) { 3513 s->s3->tmp.cert_req = 0; 3514 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE); 3515 return WORK_FINISHED_CONTINUE; 3516 } else { 3517 s->s3->tmp.cert_req = 2; 3518 if (!ssl3_digest_cached_records(s, 0)) { 3519 /* SSLfatal() already called */ 3520 return WORK_ERROR; 3521 } 3522 } 3523 } 3524 3525 if (s->post_handshake_auth == SSL_PHA_REQUESTED) 3526 return WORK_FINISHED_STOP; 3527 return WORK_FINISHED_CONTINUE; 3528 } 3529 3530 /* Shouldn't ever get here */ 3531 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PREPARE_CLIENT_CERTIFICATE, 3532 ERR_R_INTERNAL_ERROR); 3533 return WORK_ERROR; 3534 } 3535 3536 int tls_construct_client_certificate(SSL *s, WPACKET *pkt) 3537 { 3538 if (SSL_IS_TLS13(s)) { 3539 if (s->pha_context == NULL) { 3540 /* no context available, add 0-length context */ 3541 if (!WPACKET_put_bytes_u8(pkt, 0)) { 3542 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3543 SSL_F_TLS_CONSTRUCT_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); 3544 return 0; 3545 } 3546 } else if (!WPACKET_sub_memcpy_u8(pkt, s->pha_context, s->pha_context_len)) { 3547 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3548 SSL_F_TLS_CONSTRUCT_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); 3549 return 0; 3550 } 3551 } 3552 if (!ssl3_output_cert_chain(s, pkt, 3553 (s->s3->tmp.cert_req == 2) ? NULL 3554 : s->cert->key)) { 3555 /* SSLfatal() already called */ 3556 return 0; 3557 } 3558 3559 if (SSL_IS_TLS13(s) 3560 && SSL_IS_FIRST_HANDSHAKE(s) 3561 && (!s->method->ssl3_enc->change_cipher_state(s, 3562 SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_CLIENT_WRITE))) { 3563 /* 3564 * This is a fatal error, which leaves enc_write_ctx in an inconsistent 3565 * state and thus ssl3_send_alert may crash. 3566 */ 3567 SSLfatal(s, SSL_AD_NO_ALERT, SSL_F_TLS_CONSTRUCT_CLIENT_CERTIFICATE, 3568 SSL_R_CANNOT_CHANGE_CIPHER); 3569 return 0; 3570 } 3571 3572 return 1; 3573 } 3574 3575 int ssl3_check_cert_and_algorithm(SSL *s) 3576 { 3577 const SSL_CERT_LOOKUP *clu; 3578 size_t idx; 3579 long alg_k, alg_a; 3580 3581 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 3582 alg_a = s->s3->tmp.new_cipher->algorithm_auth; 3583 3584 /* we don't have a certificate */ 3585 if (!(alg_a & SSL_aCERT)) 3586 return 1; 3587 3588 /* This is the passed certificate */ 3589 clu = ssl_cert_lookup_by_pkey(X509_get0_pubkey(s->session->peer), &idx); 3590 3591 /* Check certificate is recognised and suitable for cipher */ 3592 if (clu == NULL || (alg_a & clu->amask) == 0) { 3593 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 3594 SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3595 SSL_R_MISSING_SIGNING_CERT); 3596 return 0; 3597 } 3598 3599 #ifndef OPENSSL_NO_EC 3600 if (clu->amask & SSL_aECDSA) { 3601 if (ssl_check_srvr_ecc_cert_and_alg(s->session->peer, s)) 3602 return 1; 3603 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 3604 SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_BAD_ECC_CERT); 3605 return 0; 3606 } 3607 #endif 3608 #ifndef OPENSSL_NO_RSA 3609 if (alg_k & (SSL_kRSA | SSL_kRSAPSK) && idx != SSL_PKEY_RSA) { 3610 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, 3611 SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3612 SSL_R_MISSING_RSA_ENCRYPTING_CERT); 3613 return 0; 3614 } 3615 #endif 3616 #ifndef OPENSSL_NO_DH 3617 if ((alg_k & SSL_kDHE) && (s->s3->peer_tmp == NULL)) { 3618 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3619 ERR_R_INTERNAL_ERROR); 3620 return 0; 3621 } 3622 #endif 3623 3624 return 1; 3625 } 3626 3627 #ifndef OPENSSL_NO_NEXTPROTONEG 3628 int tls_construct_next_proto(SSL *s, WPACKET *pkt) 3629 { 3630 size_t len, padding_len; 3631 unsigned char *padding = NULL; 3632 3633 len = s->ext.npn_len; 3634 padding_len = 32 - ((len + 2) % 32); 3635 3636 if (!WPACKET_sub_memcpy_u8(pkt, s->ext.npn, len) 3637 || !WPACKET_sub_allocate_bytes_u8(pkt, padding_len, &padding)) { 3638 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_NEXT_PROTO, 3639 ERR_R_INTERNAL_ERROR); 3640 return 0; 3641 } 3642 3643 memset(padding, 0, padding_len); 3644 3645 return 1; 3646 } 3647 #endif 3648 3649 MSG_PROCESS_RETURN tls_process_hello_req(SSL *s, PACKET *pkt) 3650 { 3651 if (PACKET_remaining(pkt) > 0) { 3652 /* should contain no data */ 3653 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_HELLO_REQ, 3654 SSL_R_LENGTH_MISMATCH); 3655 return MSG_PROCESS_ERROR; 3656 } 3657 3658 if ((s->options & SSL_OP_NO_RENEGOTIATION)) { 3659 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_RENEGOTIATION); 3660 return MSG_PROCESS_FINISHED_READING; 3661 } 3662 3663 /* 3664 * This is a historical discrepancy (not in the RFC) maintained for 3665 * compatibility reasons. If a TLS client receives a HelloRequest it will 3666 * attempt an abbreviated handshake. However if a DTLS client receives a 3667 * HelloRequest it will do a full handshake. Either behaviour is reasonable 3668 * but doing one for TLS and another for DTLS is odd. 3669 */ 3670 if (SSL_IS_DTLS(s)) 3671 SSL_renegotiate(s); 3672 else 3673 SSL_renegotiate_abbreviated(s); 3674 3675 return MSG_PROCESS_FINISHED_READING; 3676 } 3677 3678 static MSG_PROCESS_RETURN tls_process_encrypted_extensions(SSL *s, PACKET *pkt) 3679 { 3680 PACKET extensions; 3681 RAW_EXTENSION *rawexts = NULL; 3682 3683 if (!PACKET_as_length_prefixed_2(pkt, &extensions) 3684 || PACKET_remaining(pkt) != 0) { 3685 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_ENCRYPTED_EXTENSIONS, 3686 SSL_R_LENGTH_MISMATCH); 3687 goto err; 3688 } 3689 3690 if (!tls_collect_extensions(s, &extensions, 3691 SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, &rawexts, 3692 NULL, 1) 3693 || !tls_parse_all_extensions(s, SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, 3694 rawexts, NULL, 0, 1)) { 3695 /* SSLfatal() already called */ 3696 goto err; 3697 } 3698 3699 OPENSSL_free(rawexts); 3700 return MSG_PROCESS_CONTINUE_READING; 3701 3702 err: 3703 OPENSSL_free(rawexts); 3704 return MSG_PROCESS_ERROR; 3705 } 3706 3707 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 3708 { 3709 int i = 0; 3710 #ifndef OPENSSL_NO_ENGINE 3711 if (s->ctx->client_cert_engine) { 3712 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s, 3713 SSL_get_client_CA_list(s), 3714 px509, ppkey, NULL, NULL, NULL); 3715 if (i != 0) 3716 return i; 3717 } 3718 #endif 3719 if (s->ctx->client_cert_cb) 3720 i = s->ctx->client_cert_cb(s, px509, ppkey); 3721 return i; 3722 } 3723 3724 int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk, WPACKET *pkt) 3725 { 3726 int i; 3727 size_t totlen = 0, len, maxlen, maxverok = 0; 3728 int empty_reneg_info_scsv = !s->renegotiate; 3729 3730 /* Set disabled masks for this session */ 3731 if (!ssl_set_client_disabled(s)) { 3732 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_CIPHER_LIST_TO_BYTES, 3733 SSL_R_NO_PROTOCOLS_AVAILABLE); 3734 return 0; 3735 } 3736 3737 if (sk == NULL) { 3738 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_CIPHER_LIST_TO_BYTES, 3739 ERR_R_INTERNAL_ERROR); 3740 return 0; 3741 } 3742 3743 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH 3744 # if OPENSSL_MAX_TLS1_2_CIPHER_LENGTH < 6 3745 # error Max cipher length too short 3746 # endif 3747 /* 3748 * Some servers hang if client hello > 256 bytes as hack workaround 3749 * chop number of supported ciphers to keep it well below this if we 3750 * use TLS v1.2 3751 */ 3752 if (TLS1_get_version(s) >= TLS1_2_VERSION) 3753 maxlen = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1; 3754 else 3755 #endif 3756 /* Maximum length that can be stored in 2 bytes. Length must be even */ 3757 maxlen = 0xfffe; 3758 3759 if (empty_reneg_info_scsv) 3760 maxlen -= 2; 3761 if (s->mode & SSL_MODE_SEND_FALLBACK_SCSV) 3762 maxlen -= 2; 3763 3764 for (i = 0; i < sk_SSL_CIPHER_num(sk) && totlen < maxlen; i++) { 3765 const SSL_CIPHER *c; 3766 3767 c = sk_SSL_CIPHER_value(sk, i); 3768 /* Skip disabled ciphers */ 3769 if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_SUPPORTED, 0)) 3770 continue; 3771 3772 if (!s->method->put_cipher_by_char(c, pkt, &len)) { 3773 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_CIPHER_LIST_TO_BYTES, 3774 ERR_R_INTERNAL_ERROR); 3775 return 0; 3776 } 3777 3778 /* Sanity check that the maximum version we offer has ciphers enabled */ 3779 if (!maxverok) { 3780 if (SSL_IS_DTLS(s)) { 3781 if (DTLS_VERSION_GE(c->max_dtls, s->s3->tmp.max_ver) 3782 && DTLS_VERSION_LE(c->min_dtls, s->s3->tmp.max_ver)) 3783 maxverok = 1; 3784 } else { 3785 if (c->max_tls >= s->s3->tmp.max_ver 3786 && c->min_tls <= s->s3->tmp.max_ver) 3787 maxverok = 1; 3788 } 3789 } 3790 3791 totlen += len; 3792 } 3793 3794 if (totlen == 0 || !maxverok) { 3795 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_CIPHER_LIST_TO_BYTES, 3796 SSL_R_NO_CIPHERS_AVAILABLE); 3797 3798 if (!maxverok) 3799 ERR_add_error_data(1, "No ciphers enabled for max supported " 3800 "SSL/TLS version"); 3801 3802 return 0; 3803 } 3804 3805 if (totlen != 0) { 3806 if (empty_reneg_info_scsv) { 3807 static SSL_CIPHER scsv = { 3808 0, NULL, NULL, SSL3_CK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0 3809 }; 3810 if (!s->method->put_cipher_by_char(&scsv, pkt, &len)) { 3811 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3812 SSL_F_SSL_CIPHER_LIST_TO_BYTES, ERR_R_INTERNAL_ERROR); 3813 return 0; 3814 } 3815 } 3816 if (s->mode & SSL_MODE_SEND_FALLBACK_SCSV) { 3817 static SSL_CIPHER scsv = { 3818 0, NULL, NULL, SSL3_CK_FALLBACK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0 3819 }; 3820 if (!s->method->put_cipher_by_char(&scsv, pkt, &len)) { 3821 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3822 SSL_F_SSL_CIPHER_LIST_TO_BYTES, ERR_R_INTERNAL_ERROR); 3823 return 0; 3824 } 3825 } 3826 } 3827 3828 return 1; 3829 } 3830 3831 int tls_construct_end_of_early_data(SSL *s, WPACKET *pkt) 3832 { 3833 if (s->early_data_state != SSL_EARLY_DATA_WRITE_RETRY 3834 && s->early_data_state != SSL_EARLY_DATA_FINISHED_WRITING) { 3835 SSLfatal(s, SSL_AD_INTERNAL_ERROR, 3836 SSL_F_TLS_CONSTRUCT_END_OF_EARLY_DATA, 3837 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 3838 return 0; 3839 } 3840 3841 s->early_data_state = SSL_EARLY_DATA_FINISHED_WRITING; 3842 return 1; 3843 } 3844