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.
6 * Licensed under the Apache License 2.0 (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
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/rsa.h>
24 #include <openssl/bn.h>
25 #include <openssl/engine.h>
26 #include <openssl/trace.h>
27 #include <openssl/core_names.h>
28 #include <openssl/param_build.h>
29 #include "internal/cryptlib.h"
31 static MSG_PROCESS_RETURN tls_process_as_hello_retry_request(SSL *s, PACKET *pkt);
32 static MSG_PROCESS_RETURN tls_process_encrypted_extensions(SSL *s, PACKET *pkt);
34 static ossl_inline int cert_req_allowed(SSL *s);
35 static int key_exchange_expected(SSL *s);
36 static int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk,
40 * Is a CertificateRequest message allowed at the moment or not?
46 static ossl_inline int cert_req_allowed(SSL *s)
48 /* TLS does not like anon-DH with client cert */
49 if ((s->version > SSL3_VERSION
50 && (s->s3.tmp.new_cipher->algorithm_auth & SSL_aNULL))
51 || (s->s3.tmp.new_cipher->algorithm_auth & (SSL_aSRP | SSL_aPSK)))
58 * Should we expect the ServerKeyExchange message or not?
64 static int key_exchange_expected(SSL *s)
66 long alg_k = s->s3.tmp.new_cipher->algorithm_mkey;
69 * Can't skip server key exchange if this is an ephemeral
70 * ciphersuite or for SRP
72 if (alg_k & (SSL_kDHE | SSL_kECDHE | SSL_kDHEPSK | SSL_kECDHEPSK
81 * ossl_statem_client_read_transition() encapsulates the logic for the allowed
82 * handshake state transitions when a TLS1.3 client is reading messages from the
83 * server. The message type that the server has sent is provided in |mt|. The
84 * current state is in |s->statem.hand_state|.
86 * Return values are 1 for success (transition allowed) and 0 on error
87 * (transition not allowed)
89 static int ossl_statem_client13_read_transition(SSL *s, int mt)
91 OSSL_STATEM *st = &s->statem;
94 * Note: There is no case for TLS_ST_CW_CLNT_HELLO, because we haven't
95 * yet negotiated TLSv1.3 at that point so that is handled by
96 * ossl_statem_client_read_transition()
99 switch (st->hand_state) {
103 case TLS_ST_CW_CLNT_HELLO:
105 * This must a ClientHello following a HelloRetryRequest, so the only
106 * thing we can get now is a ServerHello.
108 if (mt == SSL3_MT_SERVER_HELLO) {
109 st->hand_state = TLS_ST_CR_SRVR_HELLO;
114 case TLS_ST_CR_SRVR_HELLO:
115 if (mt == SSL3_MT_ENCRYPTED_EXTENSIONS) {
116 st->hand_state = TLS_ST_CR_ENCRYPTED_EXTENSIONS;
121 case TLS_ST_CR_ENCRYPTED_EXTENSIONS:
123 if (mt == SSL3_MT_FINISHED) {
124 st->hand_state = TLS_ST_CR_FINISHED;
128 if (mt == SSL3_MT_CERTIFICATE_REQUEST) {
129 st->hand_state = TLS_ST_CR_CERT_REQ;
132 if (mt == SSL3_MT_CERTIFICATE) {
133 st->hand_state = TLS_ST_CR_CERT;
139 case TLS_ST_CR_CERT_REQ:
140 if (mt == SSL3_MT_CERTIFICATE) {
141 st->hand_state = TLS_ST_CR_CERT;
147 if (mt == SSL3_MT_CERTIFICATE_VERIFY) {
148 st->hand_state = TLS_ST_CR_CERT_VRFY;
153 case TLS_ST_CR_CERT_VRFY:
154 if (mt == SSL3_MT_FINISHED) {
155 st->hand_state = TLS_ST_CR_FINISHED;
161 if (mt == SSL3_MT_NEWSESSION_TICKET) {
162 st->hand_state = TLS_ST_CR_SESSION_TICKET;
165 if (mt == SSL3_MT_KEY_UPDATE) {
166 st->hand_state = TLS_ST_CR_KEY_UPDATE;
169 if (mt == SSL3_MT_CERTIFICATE_REQUEST) {
170 #if DTLS_MAX_VERSION_INTERNAL != DTLS1_2_VERSION
171 /* Restore digest for PHA before adding message.*/
172 # error Internal DTLS version error
174 if (!SSL_IS_DTLS(s) && s->post_handshake_auth == SSL_PHA_EXT_SENT) {
175 s->post_handshake_auth = SSL_PHA_REQUESTED;
177 * In TLS, this is called before the message is added to the
178 * digest. In DTLS, this is expected to be called after adding
179 * to the digest. Either move the digest restore, or add the
180 * message here after the swap, or do it after the clientFinished?
182 if (!tls13_restore_handshake_digest_for_pha(s)) {
183 /* SSLfatal() already called */
186 st->hand_state = TLS_ST_CR_CERT_REQ;
193 /* No valid transition found */
198 * ossl_statem_client_read_transition() encapsulates the logic for the allowed
199 * handshake state transitions when the client is reading messages from the
200 * server. The message type that the server has sent is provided in |mt|. The
201 * current state is in |s->statem.hand_state|.
203 * Return values are 1 for success (transition allowed) and 0 on error
204 * (transition not allowed)
206 int ossl_statem_client_read_transition(SSL *s, int mt)
208 OSSL_STATEM *st = &s->statem;
212 * Note that after writing the first ClientHello we don't know what version
213 * we are going to negotiate yet, so we don't take this branch until later.
215 if (SSL_IS_TLS13(s)) {
216 if (!ossl_statem_client13_read_transition(s, mt))
221 switch (st->hand_state) {
225 case TLS_ST_CW_CLNT_HELLO:
226 if (mt == SSL3_MT_SERVER_HELLO) {
227 st->hand_state = TLS_ST_CR_SRVR_HELLO;
231 if (SSL_IS_DTLS(s)) {
232 if (mt == DTLS1_MT_HELLO_VERIFY_REQUEST) {
233 st->hand_state = DTLS_ST_CR_HELLO_VERIFY_REQUEST;
239 case TLS_ST_EARLY_DATA:
241 * We've not actually selected TLSv1.3 yet, but we have sent early
242 * data. The only thing allowed now is a ServerHello or a
245 if (mt == SSL3_MT_SERVER_HELLO) {
246 st->hand_state = TLS_ST_CR_SRVR_HELLO;
251 case TLS_ST_CR_SRVR_HELLO:
253 if (s->ext.ticket_expected) {
254 if (mt == SSL3_MT_NEWSESSION_TICKET) {
255 st->hand_state = TLS_ST_CR_SESSION_TICKET;
258 } else if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
259 st->hand_state = TLS_ST_CR_CHANGE;
263 if (SSL_IS_DTLS(s) && mt == DTLS1_MT_HELLO_VERIFY_REQUEST) {
264 st->hand_state = DTLS_ST_CR_HELLO_VERIFY_REQUEST;
266 } else if (s->version >= TLS1_VERSION
267 && s->ext.session_secret_cb != NULL
268 && s->session->ext.tick != NULL
269 && mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
271 * Normally, we can tell if the server is resuming the session
272 * from the session ID. EAP-FAST (RFC 4851), however, relies on
273 * the next server message after the ServerHello to determine if
274 * the server is resuming.
277 st->hand_state = TLS_ST_CR_CHANGE;
279 } else if (!(s->s3.tmp.new_cipher->algorithm_auth
280 & (SSL_aNULL | SSL_aSRP | SSL_aPSK))) {
281 if (mt == SSL3_MT_CERTIFICATE) {
282 st->hand_state = TLS_ST_CR_CERT;
286 ske_expected = key_exchange_expected(s);
287 /* SKE is optional for some PSK ciphersuites */
289 || ((s->s3.tmp.new_cipher->algorithm_mkey & SSL_PSK)
290 && mt == SSL3_MT_SERVER_KEY_EXCHANGE)) {
291 if (mt == SSL3_MT_SERVER_KEY_EXCHANGE) {
292 st->hand_state = TLS_ST_CR_KEY_EXCH;
295 } else if (mt == SSL3_MT_CERTIFICATE_REQUEST
296 && cert_req_allowed(s)) {
297 st->hand_state = TLS_ST_CR_CERT_REQ;
299 } else if (mt == SSL3_MT_SERVER_DONE) {
300 st->hand_state = TLS_ST_CR_SRVR_DONE;
309 * The CertificateStatus message is optional even if
310 * |ext.status_expected| is set
312 if (s->ext.status_expected && mt == SSL3_MT_CERTIFICATE_STATUS) {
313 st->hand_state = TLS_ST_CR_CERT_STATUS;
318 case TLS_ST_CR_CERT_STATUS:
319 ske_expected = key_exchange_expected(s);
320 /* SKE is optional for some PSK ciphersuites */
321 if (ske_expected || ((s->s3.tmp.new_cipher->algorithm_mkey & SSL_PSK)
322 && mt == SSL3_MT_SERVER_KEY_EXCHANGE)) {
323 if (mt == SSL3_MT_SERVER_KEY_EXCHANGE) {
324 st->hand_state = TLS_ST_CR_KEY_EXCH;
331 case TLS_ST_CR_KEY_EXCH:
332 if (mt == SSL3_MT_CERTIFICATE_REQUEST) {
333 if (cert_req_allowed(s)) {
334 st->hand_state = TLS_ST_CR_CERT_REQ;
341 case TLS_ST_CR_CERT_REQ:
342 if (mt == SSL3_MT_SERVER_DONE) {
343 st->hand_state = TLS_ST_CR_SRVR_DONE;
348 case TLS_ST_CW_FINISHED:
349 if (s->ext.ticket_expected) {
350 if (mt == SSL3_MT_NEWSESSION_TICKET) {
351 st->hand_state = TLS_ST_CR_SESSION_TICKET;
354 } else if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
355 st->hand_state = TLS_ST_CR_CHANGE;
360 case TLS_ST_CR_SESSION_TICKET:
361 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
362 st->hand_state = TLS_ST_CR_CHANGE;
367 case TLS_ST_CR_CHANGE:
368 if (mt == SSL3_MT_FINISHED) {
369 st->hand_state = TLS_ST_CR_FINISHED;
375 if (mt == SSL3_MT_HELLO_REQUEST) {
376 st->hand_state = TLS_ST_CR_HELLO_REQ;
383 /* No valid transition found */
384 if (SSL_IS_DTLS(s) && mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
388 * CCS messages don't have a message sequence number so this is probably
389 * because of an out-of-order CCS. We'll just drop it.
392 s->rwstate = SSL_READING;
393 rbio = SSL_get_rbio(s);
394 BIO_clear_retry_flags(rbio);
395 BIO_set_retry_read(rbio);
398 SSLfatal(s, SSL3_AD_UNEXPECTED_MESSAGE, SSL_R_UNEXPECTED_MESSAGE);
403 * ossl_statem_client13_write_transition() works out what handshake state to
404 * move to next when the TLSv1.3 client is writing messages to be sent to the
407 static WRITE_TRAN ossl_statem_client13_write_transition(SSL *s)
409 OSSL_STATEM *st = &s->statem;
412 * Note: There are no cases for TLS_ST_BEFORE because we haven't negotiated
413 * TLSv1.3 yet at that point. They are handled by
414 * ossl_statem_client_write_transition().
416 switch (st->hand_state) {
418 /* Shouldn't happen */
419 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
420 return WRITE_TRAN_ERROR;
422 case TLS_ST_CR_CERT_REQ:
423 if (s->post_handshake_auth == SSL_PHA_REQUESTED) {
424 st->hand_state = TLS_ST_CW_CERT;
425 return WRITE_TRAN_CONTINUE;
428 * We should only get here if we received a CertificateRequest after
429 * we already sent close_notify
431 if (!ossl_assert((s->shutdown & SSL_SENT_SHUTDOWN) != 0)) {
432 /* Shouldn't happen - same as default case */
433 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
434 return WRITE_TRAN_ERROR;
436 st->hand_state = TLS_ST_OK;
437 return WRITE_TRAN_CONTINUE;
439 case TLS_ST_CR_FINISHED:
440 if (s->early_data_state == SSL_EARLY_DATA_WRITE_RETRY
441 || s->early_data_state == SSL_EARLY_DATA_FINISHED_WRITING)
442 st->hand_state = TLS_ST_PENDING_EARLY_DATA_END;
443 else if ((s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) != 0
444 && s->hello_retry_request == SSL_HRR_NONE)
445 st->hand_state = TLS_ST_CW_CHANGE;
447 st->hand_state = (s->s3.tmp.cert_req != 0) ? TLS_ST_CW_CERT
448 : TLS_ST_CW_FINISHED;
449 return WRITE_TRAN_CONTINUE;
451 case TLS_ST_PENDING_EARLY_DATA_END:
452 if (s->ext.early_data == SSL_EARLY_DATA_ACCEPTED) {
453 st->hand_state = TLS_ST_CW_END_OF_EARLY_DATA;
454 return WRITE_TRAN_CONTINUE;
458 case TLS_ST_CW_END_OF_EARLY_DATA:
459 case TLS_ST_CW_CHANGE:
460 st->hand_state = (s->s3.tmp.cert_req != 0) ? TLS_ST_CW_CERT
461 : TLS_ST_CW_FINISHED;
462 return WRITE_TRAN_CONTINUE;
465 /* If a non-empty Certificate we also send CertificateVerify */
466 st->hand_state = (s->s3.tmp.cert_req == 1) ? TLS_ST_CW_CERT_VRFY
467 : TLS_ST_CW_FINISHED;
468 return WRITE_TRAN_CONTINUE;
470 case TLS_ST_CW_CERT_VRFY:
471 st->hand_state = TLS_ST_CW_FINISHED;
472 return WRITE_TRAN_CONTINUE;
474 case TLS_ST_CR_KEY_UPDATE:
475 case TLS_ST_CW_KEY_UPDATE:
476 case TLS_ST_CR_SESSION_TICKET:
477 case TLS_ST_CW_FINISHED:
478 st->hand_state = TLS_ST_OK;
479 return WRITE_TRAN_CONTINUE;
482 if (s->key_update != SSL_KEY_UPDATE_NONE) {
483 st->hand_state = TLS_ST_CW_KEY_UPDATE;
484 return WRITE_TRAN_CONTINUE;
487 /* Try to read from the server instead */
488 return WRITE_TRAN_FINISHED;
493 * ossl_statem_client_write_transition() works out what handshake state to
494 * move to next when the client is writing messages to be sent to the server.
496 WRITE_TRAN ossl_statem_client_write_transition(SSL *s)
498 OSSL_STATEM *st = &s->statem;
501 * Note that immediately before/after a ClientHello we don't know what
502 * version we are going to negotiate yet, so we don't take this branch until
506 return ossl_statem_client13_write_transition(s);
508 switch (st->hand_state) {
510 /* Shouldn't happen */
511 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
512 return WRITE_TRAN_ERROR;
515 if (!s->renegotiate) {
517 * We haven't requested a renegotiation ourselves so we must have
518 * received a message from the server. Better read it.
520 return WRITE_TRAN_FINISHED;
525 st->hand_state = TLS_ST_CW_CLNT_HELLO;
526 return WRITE_TRAN_CONTINUE;
528 case TLS_ST_CW_CLNT_HELLO:
529 if (s->early_data_state == SSL_EARLY_DATA_CONNECTING) {
531 * We are assuming this is a TLSv1.3 connection, although we haven't
532 * actually selected a version yet.
534 if ((s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) != 0)
535 st->hand_state = TLS_ST_CW_CHANGE;
537 st->hand_state = TLS_ST_EARLY_DATA;
538 return WRITE_TRAN_CONTINUE;
541 * No transition at the end of writing because we don't know what
544 return WRITE_TRAN_FINISHED;
546 case TLS_ST_CR_SRVR_HELLO:
548 * We only get here in TLSv1.3. We just received an HRR, so issue a
549 * CCS unless middlebox compat mode is off, or we already issued one
550 * because we did early data.
552 if ((s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) != 0
553 && s->early_data_state != SSL_EARLY_DATA_FINISHED_WRITING)
554 st->hand_state = TLS_ST_CW_CHANGE;
556 st->hand_state = TLS_ST_CW_CLNT_HELLO;
557 return WRITE_TRAN_CONTINUE;
559 case TLS_ST_EARLY_DATA:
560 return WRITE_TRAN_FINISHED;
562 case DTLS_ST_CR_HELLO_VERIFY_REQUEST:
563 st->hand_state = TLS_ST_CW_CLNT_HELLO;
564 return WRITE_TRAN_CONTINUE;
566 case TLS_ST_CR_SRVR_DONE:
567 if (s->s3.tmp.cert_req)
568 st->hand_state = TLS_ST_CW_CERT;
570 st->hand_state = TLS_ST_CW_KEY_EXCH;
571 return WRITE_TRAN_CONTINUE;
574 st->hand_state = TLS_ST_CW_KEY_EXCH;
575 return WRITE_TRAN_CONTINUE;
577 case TLS_ST_CW_KEY_EXCH:
579 * For TLS, cert_req is set to 2, so a cert chain of nothing is
580 * sent, but no verify packet is sent
583 * XXX: For now, we do not support client authentication in ECDH
584 * cipher suites with ECDH (rather than ECDSA) certificates. We
585 * need to skip the certificate verify message when client's
586 * ECDH public key is sent inside the client certificate.
588 if (s->s3.tmp.cert_req == 1) {
589 st->hand_state = TLS_ST_CW_CERT_VRFY;
591 st->hand_state = TLS_ST_CW_CHANGE;
593 if (s->s3.flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
594 st->hand_state = TLS_ST_CW_CHANGE;
596 return WRITE_TRAN_CONTINUE;
598 case TLS_ST_CW_CERT_VRFY:
599 st->hand_state = TLS_ST_CW_CHANGE;
600 return WRITE_TRAN_CONTINUE;
602 case TLS_ST_CW_CHANGE:
603 if (s->hello_retry_request == SSL_HRR_PENDING) {
604 st->hand_state = TLS_ST_CW_CLNT_HELLO;
605 } else if (s->early_data_state == SSL_EARLY_DATA_CONNECTING) {
606 st->hand_state = TLS_ST_EARLY_DATA;
608 #if defined(OPENSSL_NO_NEXTPROTONEG)
609 st->hand_state = TLS_ST_CW_FINISHED;
611 if (!SSL_IS_DTLS(s) && s->s3.npn_seen)
612 st->hand_state = TLS_ST_CW_NEXT_PROTO;
614 st->hand_state = TLS_ST_CW_FINISHED;
617 return WRITE_TRAN_CONTINUE;
619 #if !defined(OPENSSL_NO_NEXTPROTONEG)
620 case TLS_ST_CW_NEXT_PROTO:
621 st->hand_state = TLS_ST_CW_FINISHED;
622 return WRITE_TRAN_CONTINUE;
625 case TLS_ST_CW_FINISHED:
627 st->hand_state = TLS_ST_OK;
628 return WRITE_TRAN_CONTINUE;
630 return WRITE_TRAN_FINISHED;
633 case TLS_ST_CR_FINISHED:
635 st->hand_state = TLS_ST_CW_CHANGE;
636 return WRITE_TRAN_CONTINUE;
638 st->hand_state = TLS_ST_OK;
639 return WRITE_TRAN_CONTINUE;
642 case TLS_ST_CR_HELLO_REQ:
644 * If we can renegotiate now then do so, otherwise wait for a more
647 if (ssl3_renegotiate_check(s, 1)) {
648 if (!tls_setup_handshake(s)) {
649 /* SSLfatal() already called */
650 return WRITE_TRAN_ERROR;
652 st->hand_state = TLS_ST_CW_CLNT_HELLO;
653 return WRITE_TRAN_CONTINUE;
655 st->hand_state = TLS_ST_OK;
656 return WRITE_TRAN_CONTINUE;
661 * Perform any pre work that needs to be done prior to sending a message from
662 * the client to the server.
664 WORK_STATE ossl_statem_client_pre_work(SSL *s, WORK_STATE wst)
666 OSSL_STATEM *st = &s->statem;
668 switch (st->hand_state) {
670 /* No pre work to be done */
673 case TLS_ST_CW_CLNT_HELLO:
675 if (SSL_IS_DTLS(s)) {
676 /* every DTLS ClientHello resets Finished MAC */
677 if (!ssl3_init_finished_mac(s)) {
678 /* SSLfatal() already called */
684 case TLS_ST_CW_CHANGE:
685 if (SSL_IS_DTLS(s)) {
688 * We're into the last flight so we don't retransmit these
689 * messages unless we need to.
693 #ifndef OPENSSL_NO_SCTP
694 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
695 /* Calls SSLfatal() as required */
696 return dtls_wait_for_dry(s);
702 case TLS_ST_PENDING_EARLY_DATA_END:
704 * If we've been called by SSL_do_handshake()/SSL_write(), or we did not
705 * attempt to write early data before calling SSL_read() then we press
706 * on with the handshake. Otherwise we pause here.
708 if (s->early_data_state == SSL_EARLY_DATA_FINISHED_WRITING
709 || s->early_data_state == SSL_EARLY_DATA_NONE)
710 return WORK_FINISHED_CONTINUE;
713 case TLS_ST_EARLY_DATA:
714 return tls_finish_handshake(s, wst, 0, 1);
717 /* Calls SSLfatal() as required */
718 return tls_finish_handshake(s, wst, 1, 1);
721 return WORK_FINISHED_CONTINUE;
725 * Perform any work that needs to be done after sending a message from the
726 * client to the server.
728 WORK_STATE ossl_statem_client_post_work(SSL *s, WORK_STATE wst)
730 OSSL_STATEM *st = &s->statem;
734 switch (st->hand_state) {
736 /* No post work to be done */
739 case TLS_ST_CW_CLNT_HELLO:
740 if (s->early_data_state == SSL_EARLY_DATA_CONNECTING
741 && s->max_early_data > 0) {
743 * We haven't selected TLSv1.3 yet so we don't call the change
744 * cipher state function associated with the SSL_METHOD. Instead
745 * we call tls13_change_cipher_state() directly.
747 if ((s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) == 0) {
748 if (!tls13_change_cipher_state(s,
749 SSL3_CC_EARLY | SSL3_CHANGE_CIPHER_CLIENT_WRITE)) {
750 /* SSLfatal() already called */
754 /* else we're in compat mode so we delay flushing until after CCS */
755 } else if (!statem_flush(s)) {
759 if (SSL_IS_DTLS(s)) {
760 /* Treat the next message as the first packet */
765 case TLS_ST_CW_END_OF_EARLY_DATA:
767 * We set the enc_write_ctx back to NULL because we may end up writing
768 * in cleartext again if we get a HelloRetryRequest from the server.
770 EVP_CIPHER_CTX_free(s->enc_write_ctx);
771 s->enc_write_ctx = NULL;
774 case TLS_ST_CW_KEY_EXCH:
775 if (tls_client_key_exchange_post_work(s) == 0) {
776 /* SSLfatal() already called */
781 case TLS_ST_CW_CHANGE:
782 if (SSL_IS_TLS13(s) || s->hello_retry_request == SSL_HRR_PENDING)
784 if (s->early_data_state == SSL_EARLY_DATA_CONNECTING
785 && s->max_early_data > 0) {
787 * We haven't selected TLSv1.3 yet so we don't call the change
788 * cipher state function associated with the SSL_METHOD. Instead
789 * we call tls13_change_cipher_state() directly.
791 if (!tls13_change_cipher_state(s,
792 SSL3_CC_EARLY | SSL3_CHANGE_CIPHER_CLIENT_WRITE))
796 s->session->cipher = s->s3.tmp.new_cipher;
797 #ifdef OPENSSL_NO_COMP
798 s->session->compress_meth = 0;
800 if (s->s3.tmp.new_compression == NULL)
801 s->session->compress_meth = 0;
803 s->session->compress_meth = s->s3.tmp.new_compression->id;
805 if (!s->method->ssl3_enc->setup_key_block(s)) {
806 /* SSLfatal() already called */
810 if (!s->method->ssl3_enc->change_cipher_state(s,
811 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) {
812 /* SSLfatal() already called */
816 if (SSL_IS_DTLS(s)) {
817 #ifndef OPENSSL_NO_SCTP
820 * Change to new shared key of SCTP-Auth, will be ignored if
823 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
828 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
832 case TLS_ST_CW_FINISHED:
833 #ifndef OPENSSL_NO_SCTP
834 if (wst == WORK_MORE_A && SSL_IS_DTLS(s) && s->hit == 0) {
836 * Change to new shared key of SCTP-Auth, will be ignored if
839 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
843 if (statem_flush(s) != 1)
846 if (SSL_IS_TLS13(s)) {
847 if (!tls13_save_handshake_digest_for_pha(s)) {
848 /* SSLfatal() already called */
851 if (s->post_handshake_auth != SSL_PHA_REQUESTED) {
852 if (!s->method->ssl3_enc->change_cipher_state(s,
853 SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_CLIENT_WRITE)) {
854 /* SSLfatal() already called */
861 case TLS_ST_CW_KEY_UPDATE:
862 if (statem_flush(s) != 1)
864 if (!tls13_update_key(s, 1)) {
865 /* SSLfatal() already called */
871 return WORK_FINISHED_CONTINUE;
875 * Get the message construction function and message type for sending from the
878 * Valid return values are:
882 int ossl_statem_client_construct_message(SSL *s, WPACKET *pkt,
883 confunc_f *confunc, int *mt)
885 OSSL_STATEM *st = &s->statem;
887 switch (st->hand_state) {
889 /* Shouldn't happen */
890 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_STATE);
893 case TLS_ST_CW_CHANGE:
895 *confunc = dtls_construct_change_cipher_spec;
897 *confunc = tls_construct_change_cipher_spec;
898 *mt = SSL3_MT_CHANGE_CIPHER_SPEC;
901 case TLS_ST_CW_CLNT_HELLO:
902 *confunc = tls_construct_client_hello;
903 *mt = SSL3_MT_CLIENT_HELLO;
906 case TLS_ST_CW_END_OF_EARLY_DATA:
907 *confunc = tls_construct_end_of_early_data;
908 *mt = SSL3_MT_END_OF_EARLY_DATA;
911 case TLS_ST_PENDING_EARLY_DATA_END:
917 *confunc = tls_construct_client_certificate;
918 *mt = SSL3_MT_CERTIFICATE;
921 case TLS_ST_CW_KEY_EXCH:
922 *confunc = tls_construct_client_key_exchange;
923 *mt = SSL3_MT_CLIENT_KEY_EXCHANGE;
926 case TLS_ST_CW_CERT_VRFY:
927 *confunc = tls_construct_cert_verify;
928 *mt = SSL3_MT_CERTIFICATE_VERIFY;
931 #if !defined(OPENSSL_NO_NEXTPROTONEG)
932 case TLS_ST_CW_NEXT_PROTO:
933 *confunc = tls_construct_next_proto;
934 *mt = SSL3_MT_NEXT_PROTO;
937 case TLS_ST_CW_FINISHED:
938 *confunc = tls_construct_finished;
939 *mt = SSL3_MT_FINISHED;
942 case TLS_ST_CW_KEY_UPDATE:
943 *confunc = tls_construct_key_update;
944 *mt = SSL3_MT_KEY_UPDATE;
952 * Returns the maximum allowed length for the current message that we are
953 * reading. Excludes the message header.
955 size_t ossl_statem_client_max_message_size(SSL *s)
957 OSSL_STATEM *st = &s->statem;
959 switch (st->hand_state) {
961 /* Shouldn't happen */
964 case TLS_ST_CR_SRVR_HELLO:
965 return SERVER_HELLO_MAX_LENGTH;
967 case DTLS_ST_CR_HELLO_VERIFY_REQUEST:
968 return HELLO_VERIFY_REQUEST_MAX_LENGTH;
971 return s->max_cert_list;
973 case TLS_ST_CR_CERT_VRFY:
974 return SSL3_RT_MAX_PLAIN_LENGTH;
976 case TLS_ST_CR_CERT_STATUS:
977 return SSL3_RT_MAX_PLAIN_LENGTH;
979 case TLS_ST_CR_KEY_EXCH:
980 return SERVER_KEY_EXCH_MAX_LENGTH;
982 case TLS_ST_CR_CERT_REQ:
984 * Set to s->max_cert_list for compatibility with previous releases. In
985 * practice these messages can get quite long if servers are configured
986 * to provide a long list of acceptable CAs
988 return s->max_cert_list;
990 case TLS_ST_CR_SRVR_DONE:
991 return SERVER_HELLO_DONE_MAX_LENGTH;
993 case TLS_ST_CR_CHANGE:
994 if (s->version == DTLS1_BAD_VER)
996 return CCS_MAX_LENGTH;
998 case TLS_ST_CR_SESSION_TICKET:
999 return SSL3_RT_MAX_PLAIN_LENGTH;
1001 case TLS_ST_CR_FINISHED:
1002 return FINISHED_MAX_LENGTH;
1004 case TLS_ST_CR_ENCRYPTED_EXTENSIONS:
1005 return ENCRYPTED_EXTENSIONS_MAX_LENGTH;
1007 case TLS_ST_CR_KEY_UPDATE:
1008 return KEY_UPDATE_MAX_LENGTH;
1013 * Process a message that the client has received from the server.
1015 MSG_PROCESS_RETURN ossl_statem_client_process_message(SSL *s, PACKET *pkt)
1017 OSSL_STATEM *st = &s->statem;
1019 switch (st->hand_state) {
1021 /* Shouldn't happen */
1022 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
1023 return MSG_PROCESS_ERROR;
1025 case TLS_ST_CR_SRVR_HELLO:
1026 return tls_process_server_hello(s, pkt);
1028 case DTLS_ST_CR_HELLO_VERIFY_REQUEST:
1029 return dtls_process_hello_verify(s, pkt);
1031 case TLS_ST_CR_CERT:
1032 return tls_process_server_certificate(s, pkt);
1034 case TLS_ST_CR_CERT_VRFY:
1035 return tls_process_cert_verify(s, pkt);
1037 case TLS_ST_CR_CERT_STATUS:
1038 return tls_process_cert_status(s, pkt);
1040 case TLS_ST_CR_KEY_EXCH:
1041 return tls_process_key_exchange(s, pkt);
1043 case TLS_ST_CR_CERT_REQ:
1044 return tls_process_certificate_request(s, pkt);
1046 case TLS_ST_CR_SRVR_DONE:
1047 return tls_process_server_done(s, pkt);
1049 case TLS_ST_CR_CHANGE:
1050 return tls_process_change_cipher_spec(s, pkt);
1052 case TLS_ST_CR_SESSION_TICKET:
1053 return tls_process_new_session_ticket(s, pkt);
1055 case TLS_ST_CR_FINISHED:
1056 return tls_process_finished(s, pkt);
1058 case TLS_ST_CR_HELLO_REQ:
1059 return tls_process_hello_req(s, pkt);
1061 case TLS_ST_CR_ENCRYPTED_EXTENSIONS:
1062 return tls_process_encrypted_extensions(s, pkt);
1064 case TLS_ST_CR_KEY_UPDATE:
1065 return tls_process_key_update(s, pkt);
1070 * Perform any further processing required following the receipt of a message
1073 WORK_STATE ossl_statem_client_post_process_message(SSL *s, WORK_STATE wst)
1075 OSSL_STATEM *st = &s->statem;
1077 switch (st->hand_state) {
1079 /* Shouldn't happen */
1080 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
1083 case TLS_ST_CR_CERT:
1084 return tls_post_process_server_certificate(s, wst);
1086 case TLS_ST_CR_CERT_VRFY:
1087 case TLS_ST_CR_CERT_REQ:
1088 return tls_prepare_client_certificate(s, wst);
1092 int tls_construct_client_hello(SSL *s, WPACKET *pkt)
1097 #ifndef OPENSSL_NO_COMP
1100 SSL_SESSION *sess = s->session;
1101 unsigned char *session_id;
1103 /* Work out what SSL/TLS/DTLS version to use */
1104 protverr = ssl_set_client_hello_version(s);
1105 if (protverr != 0) {
1106 SSLfatal(s, SSL_AD_INTERNAL_ERROR, protverr);
1111 || !ssl_version_supported(s, sess->ssl_version, NULL)
1112 || !SSL_SESSION_is_resumable(sess)) {
1113 if (s->hello_retry_request == SSL_HRR_NONE
1114 && !ssl_get_new_session(s, 0)) {
1115 /* SSLfatal() already called */
1119 /* else use the pre-loaded session */
1121 p = s->s3.client_random;
1124 * for DTLS if client_random is initialized, reuse it, we are
1125 * required to use same upon reply to HelloVerify
1127 if (SSL_IS_DTLS(s)) {
1130 for (idx = 0; idx < sizeof(s->s3.client_random); idx++) {
1137 i = (s->hello_retry_request == SSL_HRR_NONE);
1140 if (i && ssl_fill_hello_random(s, 0, p, sizeof(s->s3.client_random),
1141 DOWNGRADE_NONE) <= 0) {
1142 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
1147 * version indicates the negotiated version: for example from
1148 * an SSLv2/v3 compatible client hello). The client_version
1149 * field is the maximum version we permit and it is also
1150 * used in RSA encrypted premaster secrets. Some servers can
1151 * choke if we initially report a higher version then
1152 * renegotiate to a lower one in the premaster secret. This
1153 * didn't happen with TLS 1.0 as most servers supported it
1154 * but it can with TLS 1.1 or later if the server only supports
1157 * Possible scenario with previous logic:
1158 * 1. Client hello indicates TLS 1.2
1159 * 2. Server hello says TLS 1.0
1160 * 3. RSA encrypted premaster secret uses 1.2.
1161 * 4. Handshake proceeds using TLS 1.0.
1162 * 5. Server sends hello request to renegotiate.
1163 * 6. Client hello indicates TLS v1.0 as we now
1164 * know that is maximum server supports.
1165 * 7. Server chokes on RSA encrypted premaster secret
1166 * containing version 1.0.
1168 * For interoperability it should be OK to always use the
1169 * maximum version we support in client hello and then rely
1170 * on the checking of version to ensure the servers isn't
1171 * being inconsistent: for example initially negotiating with
1172 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
1173 * client_version in client hello and not resetting it to
1174 * the negotiated version.
1176 * For TLS 1.3 we always set the ClientHello version to 1.2 and rely on the
1177 * supported_versions extension for the real supported versions.
1179 if (!WPACKET_put_bytes_u16(pkt, s->client_version)
1180 || !WPACKET_memcpy(pkt, s->s3.client_random, SSL3_RANDOM_SIZE)) {
1181 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
1186 session_id = s->session->session_id;
1187 if (s->new_session || s->session->ssl_version == TLS1_3_VERSION) {
1188 if (s->version == TLS1_3_VERSION
1189 && (s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) != 0) {
1190 sess_id_len = sizeof(s->tmp_session_id);
1191 s->tmp_session_id_len = sess_id_len;
1192 session_id = s->tmp_session_id;
1193 if (s->hello_retry_request == SSL_HRR_NONE
1194 && RAND_bytes_ex(s->ctx->libctx, s->tmp_session_id,
1195 sess_id_len, 0) <= 0) {
1196 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
1203 assert(s->session->session_id_length <= sizeof(s->session->session_id));
1204 sess_id_len = s->session->session_id_length;
1205 if (s->version == TLS1_3_VERSION) {
1206 s->tmp_session_id_len = sess_id_len;
1207 memcpy(s->tmp_session_id, s->session->session_id, sess_id_len);
1210 if (!WPACKET_start_sub_packet_u8(pkt)
1211 || (sess_id_len != 0 && !WPACKET_memcpy(pkt, session_id,
1213 || !WPACKET_close(pkt)) {
1214 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
1218 /* cookie stuff for DTLS */
1219 if (SSL_IS_DTLS(s)) {
1220 if (s->d1->cookie_len > sizeof(s->d1->cookie)
1221 || !WPACKET_sub_memcpy_u8(pkt, s->d1->cookie,
1222 s->d1->cookie_len)) {
1223 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
1228 /* Ciphers supported */
1229 if (!WPACKET_start_sub_packet_u16(pkt)) {
1230 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
1234 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), pkt)) {
1235 /* SSLfatal() already called */
1238 if (!WPACKET_close(pkt)) {
1239 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
1244 if (!WPACKET_start_sub_packet_u8(pkt)) {
1245 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
1248 #ifndef OPENSSL_NO_COMP
1249 if (ssl_allow_compression(s)
1250 && s->ctx->comp_methods
1251 && (SSL_IS_DTLS(s) || s->s3.tmp.max_ver < TLS1_3_VERSION)) {
1252 int compnum = sk_SSL_COMP_num(s->ctx->comp_methods);
1253 for (i = 0; i < compnum; i++) {
1254 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
1255 if (!WPACKET_put_bytes_u8(pkt, comp->id)) {
1256 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
1262 /* Add the NULL method */
1263 if (!WPACKET_put_bytes_u8(pkt, 0) || !WPACKET_close(pkt)) {
1264 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
1268 /* TLS extensions */
1269 if (!tls_construct_extensions(s, pkt, SSL_EXT_CLIENT_HELLO, NULL, 0)) {
1270 /* SSLfatal() already called */
1277 MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, PACKET *pkt)
1282 if (!PACKET_forward(pkt, 2)
1283 || !PACKET_get_length_prefixed_1(pkt, &cookiepkt)) {
1284 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
1285 return MSG_PROCESS_ERROR;
1288 cookie_len = PACKET_remaining(&cookiepkt);
1289 if (cookie_len > sizeof(s->d1->cookie)) {
1290 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_LENGTH_TOO_LONG);
1291 return MSG_PROCESS_ERROR;
1294 if (!PACKET_copy_bytes(&cookiepkt, s->d1->cookie, cookie_len)) {
1295 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
1296 return MSG_PROCESS_ERROR;
1298 s->d1->cookie_len = cookie_len;
1300 return MSG_PROCESS_FINISHED_READING;
1303 static int set_client_ciphersuite(SSL *s, const unsigned char *cipherchars)
1305 STACK_OF(SSL_CIPHER) *sk;
1306 const SSL_CIPHER *c;
1309 c = ssl_get_cipher_by_char(s, cipherchars, 0);
1311 /* unknown cipher */
1312 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_UNKNOWN_CIPHER_RETURNED);
1316 * If it is a disabled cipher we either didn't send it in client hello,
1317 * or it's not allowed for the selected protocol. So we return an error.
1319 if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK, 1)) {
1320 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_WRONG_CIPHER_RETURNED);
1324 sk = ssl_get_ciphers_by_id(s);
1325 i = sk_SSL_CIPHER_find(sk, c);
1327 /* we did not say we would use this cipher */
1328 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_WRONG_CIPHER_RETURNED);
1332 if (SSL_IS_TLS13(s) && s->s3.tmp.new_cipher != NULL
1333 && s->s3.tmp.new_cipher->id != c->id) {
1334 /* ServerHello selected a different ciphersuite to that in the HRR */
1335 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_WRONG_CIPHER_RETURNED);
1340 * Depending on the session caching (internal/external), the cipher
1341 * and/or cipher_id values may not be set. Make sure that cipher_id is
1342 * set and use it for comparison.
1344 if (s->session->cipher != NULL)
1345 s->session->cipher_id = s->session->cipher->id;
1346 if (s->hit && (s->session->cipher_id != c->id)) {
1347 if (SSL_IS_TLS13(s)) {
1349 * In TLSv1.3 it is valid for the server to select a different
1350 * ciphersuite as long as the hash is the same.
1352 if (ssl_md(s->ctx, c->algorithm2)
1353 != ssl_md(s->ctx, s->session->cipher->algorithm2)) {
1354 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1355 SSL_R_CIPHERSUITE_DIGEST_HAS_CHANGED);
1360 * Prior to TLSv1.3 resuming a session always meant using the same
1363 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1364 SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1368 s->s3.tmp.new_cipher = c;
1373 MSG_PROCESS_RETURN tls_process_server_hello(SSL *s, PACKET *pkt)
1375 PACKET session_id, extpkt;
1376 size_t session_id_len;
1377 const unsigned char *cipherchars;
1379 unsigned int compression;
1380 unsigned int sversion;
1381 unsigned int context;
1382 RAW_EXTENSION *extensions = NULL;
1383 #ifndef OPENSSL_NO_COMP
1387 if (!PACKET_get_net_2(pkt, &sversion)) {
1388 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
1392 /* load the server random */
1393 if (s->version == TLS1_3_VERSION
1394 && sversion == TLS1_2_VERSION
1395 && PACKET_remaining(pkt) >= SSL3_RANDOM_SIZE
1396 && memcmp(hrrrandom, PACKET_data(pkt), SSL3_RANDOM_SIZE) == 0) {
1397 s->hello_retry_request = SSL_HRR_PENDING;
1399 if (!PACKET_forward(pkt, SSL3_RANDOM_SIZE)) {
1400 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
1404 if (!PACKET_copy_bytes(pkt, s->s3.server_random, SSL3_RANDOM_SIZE)) {
1405 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
1410 /* Get the session-id. */
1411 if (!PACKET_get_length_prefixed_1(pkt, &session_id)) {
1412 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
1415 session_id_len = PACKET_remaining(&session_id);
1416 if (session_id_len > sizeof(s->session->session_id)
1417 || session_id_len > SSL3_SESSION_ID_SIZE) {
1418 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_SSL3_SESSION_ID_TOO_LONG);
1422 if (!PACKET_get_bytes(pkt, &cipherchars, TLS_CIPHER_LEN)) {
1423 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
1427 if (!PACKET_get_1(pkt, &compression)) {
1428 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
1432 /* TLS extensions */
1433 if (PACKET_remaining(pkt) == 0 && !hrr) {
1434 PACKET_null_init(&extpkt);
1435 } else if (!PACKET_as_length_prefixed_2(pkt, &extpkt)
1436 || PACKET_remaining(pkt) != 0) {
1437 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_LENGTH);
1442 if (!tls_collect_extensions(s, &extpkt,
1443 SSL_EXT_TLS1_2_SERVER_HELLO
1444 | SSL_EXT_TLS1_3_SERVER_HELLO,
1445 &extensions, NULL, 1)) {
1446 /* SSLfatal() already called */
1450 if (!ssl_choose_client_version(s, sversion, extensions)) {
1451 /* SSLfatal() already called */
1456 if (SSL_IS_TLS13(s) || hrr) {
1457 if (compression != 0) {
1458 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1459 SSL_R_INVALID_COMPRESSION_ALGORITHM);
1463 if (session_id_len != s->tmp_session_id_len
1464 || memcmp(PACKET_data(&session_id), s->tmp_session_id,
1465 session_id_len) != 0) {
1466 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_INVALID_SESSION_ID);
1472 if (!set_client_ciphersuite(s, cipherchars)) {
1473 /* SSLfatal() already called */
1477 return tls_process_as_hello_retry_request(s, &extpkt);
1481 * Now we have chosen the version we need to check again that the extensions
1482 * are appropriate for this version.
1484 context = SSL_IS_TLS13(s) ? SSL_EXT_TLS1_3_SERVER_HELLO
1485 : SSL_EXT_TLS1_2_SERVER_HELLO;
1486 if (!tls_validate_all_contexts(s, context, extensions)) {
1487 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_EXTENSION);
1493 if (SSL_IS_TLS13(s)) {
1495 * In TLSv1.3 a ServerHello message signals a key change so the end of
1496 * the message must be on a record boundary.
1498 if (RECORD_LAYER_processed_read_pending(&s->rlayer)) {
1499 SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE,
1500 SSL_R_NOT_ON_RECORD_BOUNDARY);
1504 /* This will set s->hit if we are resuming */
1505 if (!tls_parse_extension(s, TLSEXT_IDX_psk,
1506 SSL_EXT_TLS1_3_SERVER_HELLO,
1507 extensions, NULL, 0)) {
1508 /* SSLfatal() already called */
1513 * Check if we can resume the session based on external pre-shared
1514 * secret. EAP-FAST (RFC 4851) supports two types of session resumption.
1515 * Resumption based on server-side state works with session IDs.
1516 * Resumption based on pre-shared Protected Access Credentials (PACs)
1517 * works by overriding the SessionTicket extension at the application
1518 * layer, and does not send a session ID. (We do not know whether
1519 * EAP-FAST servers would honour the session ID.) Therefore, the session
1520 * ID alone is not a reliable indicator of session resumption, so we
1521 * first check if we can resume, and later peek at the next handshake
1522 * message to see if the server wants to resume.
1524 if (s->version >= TLS1_VERSION
1525 && s->ext.session_secret_cb != NULL && s->session->ext.tick) {
1526 const SSL_CIPHER *pref_cipher = NULL;
1528 * s->session->master_key_length is a size_t, but this is an int for
1529 * backwards compat reasons
1531 int master_key_length;
1532 master_key_length = sizeof(s->session->master_key);
1533 if (s->ext.session_secret_cb(s, s->session->master_key,
1536 s->ext.session_secret_cb_arg)
1537 && master_key_length > 0) {
1538 s->session->master_key_length = master_key_length;
1539 s->session->cipher = pref_cipher ?
1540 pref_cipher : ssl_get_cipher_by_char(s, cipherchars, 0);
1542 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
1547 if (session_id_len != 0
1548 && session_id_len == s->session->session_id_length
1549 && memcmp(PACKET_data(&session_id), s->session->session_id,
1550 session_id_len) == 0)
1555 if (s->sid_ctx_length != s->session->sid_ctx_length
1556 || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) {
1557 /* actually a client application bug */
1558 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1559 SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1564 * If we were trying for session-id reuse but the server
1565 * didn't resume, make a new SSL_SESSION.
1566 * In the case of EAP-FAST and PAC, we do not send a session ID,
1567 * so the PAC-based session secret is always preserved. It'll be
1568 * overwritten if the server refuses resumption.
1570 if (s->session->session_id_length > 0) {
1571 tsan_counter(&s->session_ctx->stats.sess_miss);
1572 if (!ssl_get_new_session(s, 0)) {
1573 /* SSLfatal() already called */
1578 s->session->ssl_version = s->version;
1580 * In TLSv1.2 and below we save the session id we were sent so we can
1581 * resume it later. In TLSv1.3 the session id we were sent is just an
1582 * echo of what we originally sent in the ClientHello and should not be
1583 * used for resumption.
1585 if (!SSL_IS_TLS13(s)) {
1586 s->session->session_id_length = session_id_len;
1587 /* session_id_len could be 0 */
1588 if (session_id_len > 0)
1589 memcpy(s->session->session_id, PACKET_data(&session_id),
1594 /* Session version and negotiated protocol version should match */
1595 if (s->version != s->session->ssl_version) {
1596 SSLfatal(s, SSL_AD_PROTOCOL_VERSION,
1597 SSL_R_SSL_SESSION_VERSION_MISMATCH);
1601 * Now that we know the version, update the check to see if it's an allowed
1604 s->s3.tmp.min_ver = s->version;
1605 s->s3.tmp.max_ver = s->version;
1607 if (!set_client_ciphersuite(s, cipherchars)) {
1608 /* SSLfatal() already called */
1612 #ifdef OPENSSL_NO_COMP
1613 if (compression != 0) {
1614 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1615 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1619 * If compression is disabled we'd better not try to resume a session
1620 * using compression.
1622 if (s->session->compress_meth != 0) {
1623 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_INCONSISTENT_COMPRESSION);
1627 if (s->hit && compression != s->session->compress_meth) {
1628 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1629 SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1632 if (compression == 0)
1634 else if (!ssl_allow_compression(s)) {
1635 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_COMPRESSION_DISABLED);
1638 comp = ssl3_comp_find(s->ctx->comp_methods, compression);
1641 if (compression != 0 && comp == NULL) {
1642 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
1643 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1646 s->s3.tmp.new_compression = comp;
1650 if (!tls_parse_all_extensions(s, context, extensions, NULL, 0, 1)) {
1651 /* SSLfatal() already called */
1655 #ifndef OPENSSL_NO_SCTP
1656 if (SSL_IS_DTLS(s) && s->hit) {
1657 unsigned char sctpauthkey[64];
1658 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
1662 * Add new shared key for SCTP-Auth, will be ignored if
1665 memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
1666 sizeof(DTLS1_SCTP_AUTH_LABEL));
1668 /* Don't include the terminating zero. */
1669 labellen = sizeof(labelbuffer) - 1;
1670 if (s->mode & SSL_MODE_DTLS_SCTP_LABEL_LENGTH_BUG)
1673 if (SSL_export_keying_material(s, sctpauthkey,
1674 sizeof(sctpauthkey),
1676 labellen, NULL, 0, 0) <= 0) {
1677 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
1681 BIO_ctrl(SSL_get_wbio(s),
1682 BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
1683 sizeof(sctpauthkey), sctpauthkey);
1688 * In TLSv1.3 we have some post-processing to change cipher state, otherwise
1689 * we're done with this message
1692 && (!s->method->ssl3_enc->setup_key_block(s)
1693 || !s->method->ssl3_enc->change_cipher_state(s,
1694 SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_CLIENT_READ))) {
1695 /* SSLfatal() already called */
1699 OPENSSL_free(extensions);
1700 return MSG_PROCESS_CONTINUE_READING;
1702 OPENSSL_free(extensions);
1703 return MSG_PROCESS_ERROR;
1706 static MSG_PROCESS_RETURN tls_process_as_hello_retry_request(SSL *s,
1709 RAW_EXTENSION *extensions = NULL;
1712 * If we were sending early_data then the enc_write_ctx is now invalid and
1713 * should not be used.
1715 EVP_CIPHER_CTX_free(s->enc_write_ctx);
1716 s->enc_write_ctx = NULL;
1718 if (!tls_collect_extensions(s, extpkt, SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST,
1719 &extensions, NULL, 1)
1720 || !tls_parse_all_extensions(s, SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST,
1721 extensions, NULL, 0, 1)) {
1722 /* SSLfatal() already called */
1726 OPENSSL_free(extensions);
1729 if (s->ext.tls13_cookie_len == 0 && s->s3.tmp.pkey != NULL) {
1731 * We didn't receive a cookie or a new key_share so the next
1732 * ClientHello will not change
1734 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_NO_CHANGE_FOLLOWING_HRR);
1739 * Re-initialise the Transcript Hash. We're going to prepopulate it with
1740 * a synthetic message_hash in place of ClientHello1.
1742 if (!create_synthetic_message_hash(s, NULL, 0, NULL, 0)) {
1743 /* SSLfatal() already called */
1748 * Add this message to the Transcript Hash. Normally this is done
1749 * automatically prior to the message processing stage. However due to the
1750 * need to create the synthetic message hash, we defer that step until now
1753 if (!ssl3_finish_mac(s, (unsigned char *)s->init_buf->data,
1754 s->init_num + SSL3_HM_HEADER_LENGTH)) {
1755 /* SSLfatal() already called */
1759 return MSG_PROCESS_FINISHED_READING;
1761 OPENSSL_free(extensions);
1762 return MSG_PROCESS_ERROR;
1765 /* prepare server cert verification by setting s->session->peer_chain from pkt */
1766 MSG_PROCESS_RETURN tls_process_server_certificate(SSL *s, PACKET *pkt)
1768 unsigned long cert_list_len, cert_len;
1770 const unsigned char *certstart, *certbytes;
1772 unsigned int context = 0;
1774 if ((s->session->peer_chain = sk_X509_new_null()) == NULL) {
1775 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
1779 if ((SSL_IS_TLS13(s) && !PACKET_get_1(pkt, &context))
1781 || !PACKET_get_net_3(pkt, &cert_list_len)
1782 || PACKET_remaining(pkt) != cert_list_len
1783 || PACKET_remaining(pkt) == 0) {
1784 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
1787 for (chainidx = 0; PACKET_remaining(pkt); chainidx++) {
1788 if (!PACKET_get_net_3(pkt, &cert_len)
1789 || !PACKET_get_bytes(pkt, &certbytes, cert_len)) {
1790 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_CERT_LENGTH_MISMATCH);
1794 certstart = certbytes;
1795 x = X509_new_ex(s->ctx->libctx, s->ctx->propq);
1797 SSLfatal(s, SSL_AD_DECODE_ERROR, ERR_R_MALLOC_FAILURE);
1798 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
1801 if (d2i_X509(&x, (const unsigned char **)&certbytes,
1802 cert_len) == NULL) {
1803 SSLfatal(s, SSL_AD_BAD_CERTIFICATE, ERR_R_ASN1_LIB);
1807 if (certbytes != (certstart + cert_len)) {
1808 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_CERT_LENGTH_MISMATCH);
1812 if (SSL_IS_TLS13(s)) {
1813 RAW_EXTENSION *rawexts = NULL;
1816 if (!PACKET_get_length_prefixed_2(pkt, &extensions)) {
1817 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_LENGTH);
1820 if (!tls_collect_extensions(s, &extensions,
1821 SSL_EXT_TLS1_3_CERTIFICATE, &rawexts,
1822 NULL, chainidx == 0)
1823 || !tls_parse_all_extensions(s, SSL_EXT_TLS1_3_CERTIFICATE,
1824 rawexts, x, chainidx,
1825 PACKET_remaining(pkt) == 0)) {
1826 OPENSSL_free(rawexts);
1827 /* SSLfatal already called */
1830 OPENSSL_free(rawexts);
1833 if (!sk_X509_push(s->session->peer_chain, x)) {
1834 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
1839 return MSG_PROCESS_CONTINUE_PROCESSING;
1843 sk_X509_pop_free(s->session->peer_chain, X509_free);
1844 s->session->peer_chain = NULL;
1845 return MSG_PROCESS_ERROR;
1849 * Verify the s->session->peer_chain and check server cert type.
1850 * On success set s->session->peer and s->session->verify_result.
1851 * Else the peer certificate verification callback may request retry.
1853 WORK_STATE tls_post_process_server_certificate(SSL *s, WORK_STATE wst)
1856 EVP_PKEY *pkey = NULL;
1857 const SSL_CERT_LOOKUP *clu;
1861 i = ssl_verify_cert_chain(s, s->session->peer_chain);
1863 s->rwstate = SSL_RETRY_VERIFY;
1867 * The documented interface is that SSL_VERIFY_PEER should be set in order
1868 * for client side verification of the server certificate to take place.
1869 * However, historically the code has only checked that *any* flag is set
1870 * to cause server verification to take place. Use of the other flags makes
1871 * no sense in client mode. An attempt to clean up the semantics was
1872 * reverted because at least one application *only* set
1873 * SSL_VERIFY_FAIL_IF_NO_PEER_CERT. Prior to the clean up this still caused
1874 * server verification to take place, after the clean up it silently did
1875 * nothing. SSL_CTX_set_verify()/SSL_set_verify() cannot validate the flags
1876 * sent to them because they are void functions. Therefore, we now use the
1877 * (less clean) historic behaviour of performing validation if any flag is
1878 * set. The *documented* interface remains the same.
1880 if (s->verify_mode != SSL_VERIFY_NONE && i <= 0) {
1881 SSLfatal(s, ssl_x509err2alert(s->verify_result),
1882 SSL_R_CERTIFICATE_VERIFY_FAILED);
1885 ERR_clear_error(); /* but we keep s->verify_result */
1887 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, i);
1892 * Inconsistency alert: cert_chain does include the peer's certificate,
1893 * which we don't include in statem_srvr.c
1895 x = sk_X509_value(s->session->peer_chain, 0);
1897 pkey = X509_get0_pubkey(x);
1899 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) {
1900 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
1901 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1905 if ((clu = ssl_cert_lookup_by_pkey(pkey, &certidx)) == NULL) {
1906 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1910 * Check certificate type is consistent with ciphersuite. For TLS 1.3
1911 * skip check since TLS 1.3 ciphersuites can be used with any certificate
1914 if (!SSL_IS_TLS13(s)) {
1915 if ((clu->amask & s->s3.tmp.new_cipher->algorithm_auth) == 0) {
1916 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_WRONG_CERTIFICATE_TYPE);
1921 X509_free(s->session->peer);
1923 s->session->peer = x;
1924 s->session->verify_result = s->verify_result;
1926 /* Save the current hash state for when we receive the CertificateVerify */
1928 && !ssl_handshake_hash(s, s->cert_verify_hash,
1929 sizeof(s->cert_verify_hash),
1930 &s->cert_verify_hash_len)) {
1931 /* SSLfatal() already called */;
1934 return WORK_FINISHED_CONTINUE;
1937 static int tls_process_ske_psk_preamble(SSL *s, PACKET *pkt)
1939 #ifndef OPENSSL_NO_PSK
1940 PACKET psk_identity_hint;
1942 /* PSK ciphersuites are preceded by an identity hint */
1944 if (!PACKET_get_length_prefixed_2(pkt, &psk_identity_hint)) {
1945 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
1950 * Store PSK identity hint for later use, hint is used in
1951 * tls_construct_client_key_exchange. Assume that the maximum length of
1952 * a PSK identity hint can be as long as the maximum length of a PSK
1955 if (PACKET_remaining(&psk_identity_hint) > PSK_MAX_IDENTITY_LEN) {
1956 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_DATA_LENGTH_TOO_LONG);
1960 if (PACKET_remaining(&psk_identity_hint) == 0) {
1961 OPENSSL_free(s->session->psk_identity_hint);
1962 s->session->psk_identity_hint = NULL;
1963 } else if (!PACKET_strndup(&psk_identity_hint,
1964 &s->session->psk_identity_hint)) {
1965 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
1971 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
1976 static int tls_process_ske_srp(SSL *s, PACKET *pkt, EVP_PKEY **pkey)
1978 #ifndef OPENSSL_NO_SRP
1979 PACKET prime, generator, salt, server_pub;
1981 if (!PACKET_get_length_prefixed_2(pkt, &prime)
1982 || !PACKET_get_length_prefixed_2(pkt, &generator)
1983 || !PACKET_get_length_prefixed_1(pkt, &salt)
1984 || !PACKET_get_length_prefixed_2(pkt, &server_pub)) {
1985 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
1990 BN_bin2bn(PACKET_data(&prime),
1991 (int)PACKET_remaining(&prime), NULL)) == NULL
1993 BN_bin2bn(PACKET_data(&generator),
1994 (int)PACKET_remaining(&generator), NULL)) == NULL
1996 BN_bin2bn(PACKET_data(&salt),
1997 (int)PACKET_remaining(&salt), NULL)) == NULL
1999 BN_bin2bn(PACKET_data(&server_pub),
2000 (int)PACKET_remaining(&server_pub), NULL)) == NULL) {
2001 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_BN_LIB);
2005 if (!srp_verify_server_param(s)) {
2006 /* SSLfatal() already called */
2010 /* We must check if there is a certificate */
2011 if (s->s3.tmp.new_cipher->algorithm_auth & (SSL_aRSA | SSL_aDSS))
2012 *pkey = X509_get0_pubkey(s->session->peer);
2016 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2021 static int tls_process_ske_dhe(SSL *s, PACKET *pkt, EVP_PKEY **pkey)
2023 PACKET prime, generator, pub_key;
2024 EVP_PKEY *peer_tmp = NULL;
2025 BIGNUM *p = NULL, *g = NULL, *bnpub_key = NULL;
2026 EVP_PKEY_CTX *pctx = NULL;
2027 OSSL_PARAM *params = NULL;
2028 OSSL_PARAM_BLD *tmpl = NULL;
2031 if (!PACKET_get_length_prefixed_2(pkt, &prime)
2032 || !PACKET_get_length_prefixed_2(pkt, &generator)
2033 || !PACKET_get_length_prefixed_2(pkt, &pub_key)) {
2034 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
2038 p = BN_bin2bn(PACKET_data(&prime), (int)PACKET_remaining(&prime), NULL);
2039 g = BN_bin2bn(PACKET_data(&generator), (int)PACKET_remaining(&generator),
2041 bnpub_key = BN_bin2bn(PACKET_data(&pub_key),
2042 (int)PACKET_remaining(&pub_key), NULL);
2043 if (p == NULL || g == NULL || bnpub_key == NULL) {
2044 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_BN_LIB);
2048 tmpl = OSSL_PARAM_BLD_new();
2050 || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P, p)
2051 || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G, g)
2052 || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PUB_KEY,
2054 || (params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL) {
2055 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2059 pctx = EVP_PKEY_CTX_new_from_name(s->ctx->libctx, "DH", s->ctx->propq);
2061 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2064 if (EVP_PKEY_fromdata_init(pctx) <= 0
2065 || EVP_PKEY_fromdata(pctx, &peer_tmp, EVP_PKEY_KEYPAIR, params) <= 0) {
2066 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_DH_VALUE);
2070 EVP_PKEY_CTX_free(pctx);
2071 pctx = EVP_PKEY_CTX_new_from_pkey(s->ctx->libctx, peer_tmp, s->ctx->propq);
2074 * EVP_PKEY_param_check() will verify that the DH params are using
2075 * a safe prime. In this context, because we're using ephemeral DH,
2076 * we're ok with it not being a safe prime.
2077 * EVP_PKEY_param_check_quick() skips the safe prime check.
2079 || EVP_PKEY_param_check_quick(pctx) != 1
2080 || EVP_PKEY_public_check(pctx) != 1) {
2081 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_DH_VALUE);
2085 if (!ssl_security(s, SSL_SECOP_TMP_DH,
2086 EVP_PKEY_get_security_bits(peer_tmp),
2088 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_DH_KEY_TOO_SMALL);
2092 s->s3.peer_tmp = peer_tmp;
2096 * FIXME: This makes assumptions about which ciphersuites come with
2097 * public keys. We should have a less ad-hoc way of doing this
2099 if (s->s3.tmp.new_cipher->algorithm_auth & (SSL_aRSA | SSL_aDSS))
2100 *pkey = X509_get0_pubkey(s->session->peer);
2101 /* else anonymous DH, so no certificate or pkey. */
2106 OSSL_PARAM_BLD_free(tmpl);
2107 OSSL_PARAM_free(params);
2108 EVP_PKEY_free(peer_tmp);
2109 EVP_PKEY_CTX_free(pctx);
2117 static int tls_process_ske_ecdhe(SSL *s, PACKET *pkt, EVP_PKEY **pkey)
2120 unsigned int curve_type, curve_id;
2123 * Extract elliptic curve parameters and the server's ephemeral ECDH
2124 * public key. We only support named (not generic) curves and
2125 * ECParameters in this case is just three bytes.
2127 if (!PACKET_get_1(pkt, &curve_type) || !PACKET_get_net_2(pkt, &curve_id)) {
2128 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_TOO_SHORT);
2132 * Check curve is named curve type and one of our preferences, if not
2133 * server has sent an invalid curve.
2135 if (curve_type != NAMED_CURVE_TYPE
2136 || !tls1_check_group_id(s, curve_id, 1)) {
2137 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_WRONG_CURVE);
2141 if ((s->s3.peer_tmp = ssl_generate_param_group(s, curve_id)) == NULL) {
2142 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2143 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
2147 if (!PACKET_get_length_prefixed_1(pkt, &encoded_pt)) {
2148 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
2152 if (EVP_PKEY_set1_encoded_public_key(s->s3.peer_tmp,
2153 PACKET_data(&encoded_pt),
2154 PACKET_remaining(&encoded_pt)) <= 0) {
2155 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_ECPOINT);
2160 * The ECC/TLS specification does not mention the use of DSA to sign
2161 * ECParameters in the server key exchange message. We do support RSA
2164 if (s->s3.tmp.new_cipher->algorithm_auth & SSL_aECDSA)
2165 *pkey = X509_get0_pubkey(s->session->peer);
2166 else if (s->s3.tmp.new_cipher->algorithm_auth & SSL_aRSA)
2167 *pkey = X509_get0_pubkey(s->session->peer);
2168 /* else anonymous ECDH, so no certificate or pkey. */
2170 /* Cache the agreed upon group in the SSL_SESSION */
2171 s->session->kex_group = curve_id;
2175 MSG_PROCESS_RETURN tls_process_key_exchange(SSL *s, PACKET *pkt)
2178 EVP_PKEY *pkey = NULL;
2179 EVP_MD_CTX *md_ctx = NULL;
2180 EVP_PKEY_CTX *pctx = NULL;
2181 PACKET save_param_start, signature;
2183 alg_k = s->s3.tmp.new_cipher->algorithm_mkey;
2185 save_param_start = *pkt;
2187 EVP_PKEY_free(s->s3.peer_tmp);
2188 s->s3.peer_tmp = NULL;
2190 if (alg_k & SSL_PSK) {
2191 if (!tls_process_ske_psk_preamble(s, pkt)) {
2192 /* SSLfatal() already called */
2197 /* Nothing else to do for plain PSK or RSAPSK */
2198 if (alg_k & (SSL_kPSK | SSL_kRSAPSK)) {
2199 } else if (alg_k & SSL_kSRP) {
2200 if (!tls_process_ske_srp(s, pkt, &pkey)) {
2201 /* SSLfatal() already called */
2204 } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) {
2205 if (!tls_process_ske_dhe(s, pkt, &pkey)) {
2206 /* SSLfatal() already called */
2209 } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) {
2210 if (!tls_process_ske_ecdhe(s, pkt, &pkey)) {
2211 /* SSLfatal() already called */
2215 SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_R_UNEXPECTED_MESSAGE);
2219 /* if it was signed, check the signature */
2222 const EVP_MD *md = NULL;
2228 * |pkt| now points to the beginning of the signature, so the difference
2229 * equals the length of the parameters.
2231 if (!PACKET_get_sub_packet(&save_param_start, ¶ms,
2232 PACKET_remaining(&save_param_start) -
2233 PACKET_remaining(pkt))) {
2234 SSLfatal(s, SSL_AD_DECODE_ERROR, ERR_R_INTERNAL_ERROR);
2238 if (SSL_USE_SIGALGS(s)) {
2239 unsigned int sigalg;
2241 if (!PACKET_get_net_2(pkt, &sigalg)) {
2242 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_TOO_SHORT);
2245 if (tls12_check_peer_sigalg(s, sigalg, pkey) <=0) {
2246 /* SSLfatal() already called */
2249 } else if (!tls1_set_peer_legacy_sigalg(s, pkey)) {
2250 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2254 if (!tls1_lookup_md(s->ctx, s->s3.tmp.peer_sigalg, &md)) {
2255 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2256 SSL_R_NO_SUITABLE_DIGEST_ALGORITHM);
2259 if (SSL_USE_SIGALGS(s))
2260 OSSL_TRACE1(TLS, "USING TLSv1.2 HASH %s\n",
2261 md == NULL ? "n/a" : EVP_MD_get0_name(md));
2263 if (!PACKET_get_length_prefixed_2(pkt, &signature)
2264 || PACKET_remaining(pkt) != 0) {
2265 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
2269 md_ctx = EVP_MD_CTX_new();
2270 if (md_ctx == NULL) {
2271 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
2275 if (EVP_DigestVerifyInit_ex(md_ctx, &pctx,
2276 md == NULL ? NULL : EVP_MD_get0_name(md),
2277 s->ctx->libctx, s->ctx->propq, pkey,
2279 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
2282 if (SSL_USE_PSS(s)) {
2283 if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0
2284 || EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx,
2285 RSA_PSS_SALTLEN_DIGEST) <= 0) {
2286 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
2290 tbslen = construct_key_exchange_tbs(s, &tbs, PACKET_data(¶ms),
2291 PACKET_remaining(¶ms));
2293 /* SSLfatal() already called */
2297 rv = EVP_DigestVerify(md_ctx, PACKET_data(&signature),
2298 PACKET_remaining(&signature), tbs, tbslen);
2301 SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_R_BAD_SIGNATURE);
2304 EVP_MD_CTX_free(md_ctx);
2307 /* aNULL, aSRP or PSK do not need public keys */
2308 if (!(s->s3.tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP))
2309 && !(alg_k & SSL_PSK)) {
2310 /* Might be wrong key type, check it */
2311 if (ssl3_check_cert_and_algorithm(s)) {
2312 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_DATA);
2314 /* else this shouldn't happen, SSLfatal() already called */
2317 /* still data left over */
2318 if (PACKET_remaining(pkt) != 0) {
2319 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_EXTRA_DATA_IN_MESSAGE);
2324 return MSG_PROCESS_CONTINUE_READING;
2326 EVP_MD_CTX_free(md_ctx);
2327 return MSG_PROCESS_ERROR;
2330 MSG_PROCESS_RETURN tls_process_certificate_request(SSL *s, PACKET *pkt)
2334 /* Clear certificate validity flags */
2335 for (i = 0; i < SSL_PKEY_NUM; i++)
2336 s->s3.tmp.valid_flags[i] = 0;
2338 if (SSL_IS_TLS13(s)) {
2339 PACKET reqctx, extensions;
2340 RAW_EXTENSION *rawexts = NULL;
2342 if ((s->shutdown & SSL_SENT_SHUTDOWN) != 0) {
2344 * We already sent close_notify. This can only happen in TLSv1.3
2345 * post-handshake messages. We can't reasonably respond to this, so
2348 return MSG_PROCESS_FINISHED_READING;
2351 /* Free and zero certificate types: it is not present in TLS 1.3 */
2352 OPENSSL_free(s->s3.tmp.ctype);
2353 s->s3.tmp.ctype = NULL;
2354 s->s3.tmp.ctype_len = 0;
2355 OPENSSL_free(s->pha_context);
2356 s->pha_context = NULL;
2357 s->pha_context_len = 0;
2359 if (!PACKET_get_length_prefixed_1(pkt, &reqctx) ||
2360 !PACKET_memdup(&reqctx, &s->pha_context, &s->pha_context_len)) {
2361 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
2362 return MSG_PROCESS_ERROR;
2365 if (!PACKET_get_length_prefixed_2(pkt, &extensions)) {
2366 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_LENGTH);
2367 return MSG_PROCESS_ERROR;
2369 if (!tls_collect_extensions(s, &extensions,
2370 SSL_EXT_TLS1_3_CERTIFICATE_REQUEST,
2372 || !tls_parse_all_extensions(s, SSL_EXT_TLS1_3_CERTIFICATE_REQUEST,
2373 rawexts, NULL, 0, 1)) {
2374 /* SSLfatal() already called */
2375 OPENSSL_free(rawexts);
2376 return MSG_PROCESS_ERROR;
2378 OPENSSL_free(rawexts);
2379 if (!tls1_process_sigalgs(s)) {
2380 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_LENGTH);
2381 return MSG_PROCESS_ERROR;
2386 /* get the certificate types */
2387 if (!PACKET_get_length_prefixed_1(pkt, &ctypes)) {
2388 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
2389 return MSG_PROCESS_ERROR;
2392 if (!PACKET_memdup(&ctypes, &s->s3.tmp.ctype, &s->s3.tmp.ctype_len)) {
2393 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2394 return MSG_PROCESS_ERROR;
2397 if (SSL_USE_SIGALGS(s)) {
2400 if (!PACKET_get_length_prefixed_2(pkt, &sigalgs)) {
2401 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
2402 return MSG_PROCESS_ERROR;
2406 * Despite this being for certificates, preserve compatibility
2407 * with pre-TLS 1.3 and use the regular sigalgs field.
2409 if (!tls1_save_sigalgs(s, &sigalgs, 0)) {
2410 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2411 SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2412 return MSG_PROCESS_ERROR;
2414 if (!tls1_process_sigalgs(s)) {
2415 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
2416 return MSG_PROCESS_ERROR;
2420 /* get the CA RDNs */
2421 if (!parse_ca_names(s, pkt)) {
2422 /* SSLfatal() already called */
2423 return MSG_PROCESS_ERROR;
2427 if (PACKET_remaining(pkt) != 0) {
2428 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
2429 return MSG_PROCESS_ERROR;
2432 /* we should setup a certificate to return.... */
2433 s->s3.tmp.cert_req = 1;
2436 * In TLSv1.3 we don't prepare the client certificate yet. We wait until
2437 * after the CertificateVerify message has been received. This is because
2438 * in TLSv1.3 the CertificateRequest arrives before the Certificate message
2439 * but in TLSv1.2 it is the other way around. We want to make sure that
2440 * SSL_get1_peer_certificate() returns something sensible in
2443 if (SSL_IS_TLS13(s) && s->post_handshake_auth != SSL_PHA_REQUESTED)
2444 return MSG_PROCESS_CONTINUE_READING;
2446 return MSG_PROCESS_CONTINUE_PROCESSING;
2449 MSG_PROCESS_RETURN tls_process_new_session_ticket(SSL *s, PACKET *pkt)
2451 unsigned int ticklen;
2452 unsigned long ticket_lifetime_hint, age_add = 0;
2453 unsigned int sess_len;
2454 RAW_EXTENSION *exts = NULL;
2456 EVP_MD *sha256 = NULL;
2458 PACKET_null_init(&nonce);
2460 if (!PACKET_get_net_4(pkt, &ticket_lifetime_hint)
2462 && (!PACKET_get_net_4(pkt, &age_add)
2463 || !PACKET_get_length_prefixed_1(pkt, &nonce)))
2464 || !PACKET_get_net_2(pkt, &ticklen)
2465 || (SSL_IS_TLS13(s) ? (ticklen == 0 || PACKET_remaining(pkt) < ticklen)
2466 : PACKET_remaining(pkt) != ticklen)) {
2467 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
2472 * Server is allowed to change its mind (in <=TLSv1.2) and send an empty
2473 * ticket. We already checked this TLSv1.3 case above, so it should never
2474 * be 0 here in that instance
2477 return MSG_PROCESS_CONTINUE_READING;
2480 * Sessions must be immutable once they go into the session cache. Otherwise
2481 * we can get multi-thread problems. Therefore we don't "update" sessions,
2482 * we replace them with a duplicate. In TLSv1.3 we need to do this every
2483 * time a NewSessionTicket arrives because those messages arrive
2484 * post-handshake and the session may have already gone into the session
2487 if (SSL_IS_TLS13(s) || s->session->session_id_length > 0) {
2488 SSL_SESSION *new_sess;
2491 * We reused an existing session, so we need to replace it with a new
2494 if ((new_sess = ssl_session_dup(s->session, 0)) == 0) {
2495 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
2499 if ((s->session_ctx->session_cache_mode & SSL_SESS_CACHE_CLIENT) != 0
2500 && !SSL_IS_TLS13(s)) {
2502 * In TLSv1.2 and below the arrival of a new tickets signals that
2503 * any old ticket we were using is now out of date, so we remove the
2504 * old session from the cache. We carry on if this fails
2506 SSL_CTX_remove_session(s->session_ctx, s->session);
2509 SSL_SESSION_free(s->session);
2510 s->session = new_sess;
2513 s->session->time = time(NULL);
2514 ssl_session_calculate_timeout(s->session);
2516 OPENSSL_free(s->session->ext.tick);
2517 s->session->ext.tick = NULL;
2518 s->session->ext.ticklen = 0;
2520 s->session->ext.tick = OPENSSL_malloc(ticklen);
2521 if (s->session->ext.tick == NULL) {
2522 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
2525 if (!PACKET_copy_bytes(pkt, s->session->ext.tick, ticklen)) {
2526 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
2530 s->session->ext.tick_lifetime_hint = ticket_lifetime_hint;
2531 s->session->ext.tick_age_add = age_add;
2532 s->session->ext.ticklen = ticklen;
2534 if (SSL_IS_TLS13(s)) {
2537 if (!PACKET_as_length_prefixed_2(pkt, &extpkt)
2538 || PACKET_remaining(pkt) != 0) {
2539 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
2543 if (!tls_collect_extensions(s, &extpkt,
2544 SSL_EXT_TLS1_3_NEW_SESSION_TICKET, &exts,
2546 || !tls_parse_all_extensions(s,
2547 SSL_EXT_TLS1_3_NEW_SESSION_TICKET,
2548 exts, NULL, 0, 1)) {
2549 /* SSLfatal() already called */
2555 * There are two ways to detect a resumed ticket session. One is to set
2556 * an appropriate session ID and then the server must return a match in
2557 * ServerHello. This allows the normal client session ID matching to work
2558 * and we know much earlier that the ticket has been accepted. The
2559 * other way is to set zero length session ID when the ticket is
2560 * presented and rely on the handshake to determine session resumption.
2561 * We choose the former approach because this fits in with assumptions
2562 * elsewhere in OpenSSL. The session ID is set to the SHA256 hash of the
2565 sha256 = EVP_MD_fetch(s->ctx->libctx, "SHA2-256", s->ctx->propq);
2566 if (sha256 == NULL) {
2567 /* Error is already recorded */
2568 SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
2572 * We use sess_len here because EVP_Digest expects an int
2573 * but s->session->session_id_length is a size_t
2575 if (!EVP_Digest(s->session->ext.tick, ticklen,
2576 s->session->session_id, &sess_len,
2578 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
2581 EVP_MD_free(sha256);
2583 s->session->session_id_length = sess_len;
2584 s->session->not_resumable = 0;
2586 /* This is a standalone message in TLSv1.3, so there is no more to read */
2587 if (SSL_IS_TLS13(s)) {
2588 const EVP_MD *md = ssl_handshake_md(s);
2589 int hashleni = EVP_MD_get_size(md);
2591 static const unsigned char nonce_label[] = "resumption";
2593 /* Ensure cast to size_t is safe */
2594 if (!ossl_assert(hashleni >= 0)) {
2595 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2598 hashlen = (size_t)hashleni;
2600 if (!tls13_hkdf_expand(s, md, s->resumption_master_secret,
2602 sizeof(nonce_label) - 1,
2603 PACKET_data(&nonce),
2604 PACKET_remaining(&nonce),
2605 s->session->master_key,
2607 /* SSLfatal() already called */
2610 s->session->master_key_length = hashlen;
2613 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
2614 return MSG_PROCESS_FINISHED_READING;
2617 return MSG_PROCESS_CONTINUE_READING;
2619 EVP_MD_free(sha256);
2621 return MSG_PROCESS_ERROR;
2625 * In TLSv1.3 this is called from the extensions code, otherwise it is used to
2626 * parse a separate message. Returns 1 on success or 0 on failure
2628 int tls_process_cert_status_body(SSL *s, PACKET *pkt)
2633 if (!PACKET_get_1(pkt, &type)
2634 || type != TLSEXT_STATUSTYPE_ocsp) {
2635 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_UNSUPPORTED_STATUS_TYPE);
2638 if (!PACKET_get_net_3_len(pkt, &resplen)
2639 || PACKET_remaining(pkt) != resplen) {
2640 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
2643 s->ext.ocsp.resp = OPENSSL_malloc(resplen);
2644 if (s->ext.ocsp.resp == NULL) {
2645 s->ext.ocsp.resp_len = 0;
2646 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
2649 s->ext.ocsp.resp_len = resplen;
2650 if (!PACKET_copy_bytes(pkt, s->ext.ocsp.resp, resplen)) {
2651 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
2659 MSG_PROCESS_RETURN tls_process_cert_status(SSL *s, PACKET *pkt)
2661 if (!tls_process_cert_status_body(s, pkt)) {
2662 /* SSLfatal() already called */
2663 return MSG_PROCESS_ERROR;
2666 return MSG_PROCESS_CONTINUE_READING;
2670 * Perform miscellaneous checks and processing after we have received the
2671 * server's initial flight. In TLS1.3 this is after the Server Finished message.
2672 * In <=TLS1.2 this is after the ServerDone message. Returns 1 on success or 0
2675 int tls_process_initial_server_flight(SSL *s)
2678 * at this point we check that we have the required stuff from
2681 if (!ssl3_check_cert_and_algorithm(s)) {
2682 /* SSLfatal() already called */
2687 * Call the ocsp status callback if needed. The |ext.ocsp.resp| and
2688 * |ext.ocsp.resp_len| values will be set if we actually received a status
2689 * message, or NULL and -1 otherwise
2691 if (s->ext.status_type != TLSEXT_STATUSTYPE_nothing
2692 && s->ctx->ext.status_cb != NULL) {
2693 int ret = s->ctx->ext.status_cb(s, s->ctx->ext.status_arg);
2696 SSLfatal(s, SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE,
2697 SSL_R_INVALID_STATUS_RESPONSE);
2701 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
2702 SSL_R_OCSP_CALLBACK_FAILURE);
2706 #ifndef OPENSSL_NO_CT
2707 if (s->ct_validation_callback != NULL) {
2708 /* Note we validate the SCTs whether or not we abort on error */
2709 if (!ssl_validate_ct(s) && (s->verify_mode & SSL_VERIFY_PEER)) {
2710 /* SSLfatal() already called */
2719 MSG_PROCESS_RETURN tls_process_server_done(SSL *s, PACKET *pkt)
2721 if (PACKET_remaining(pkt) > 0) {
2722 /* should contain no data */
2723 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
2724 return MSG_PROCESS_ERROR;
2726 #ifndef OPENSSL_NO_SRP
2727 if (s->s3.tmp.new_cipher->algorithm_mkey & SSL_kSRP) {
2728 if (ssl_srp_calc_a_param_intern(s) <= 0) {
2729 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_SRP_A_CALC);
2730 return MSG_PROCESS_ERROR;
2735 if (!tls_process_initial_server_flight(s)) {
2736 /* SSLfatal() already called */
2737 return MSG_PROCESS_ERROR;
2740 return MSG_PROCESS_FINISHED_READING;
2743 static int tls_construct_cke_psk_preamble(SSL *s, WPACKET *pkt)
2745 #ifndef OPENSSL_NO_PSK
2748 * The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes to return a
2749 * \0-terminated identity. The last byte is for us for simulating
2752 char identity[PSK_MAX_IDENTITY_LEN + 1];
2753 size_t identitylen = 0;
2754 unsigned char psk[PSK_MAX_PSK_LEN];
2755 unsigned char *tmppsk = NULL;
2756 char *tmpidentity = NULL;
2759 if (s->psk_client_callback == NULL) {
2760 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_PSK_NO_CLIENT_CB);
2764 memset(identity, 0, sizeof(identity));
2766 psklen = s->psk_client_callback(s, s->session->psk_identity_hint,
2767 identity, sizeof(identity) - 1,
2770 if (psklen > PSK_MAX_PSK_LEN) {
2771 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, ERR_R_INTERNAL_ERROR);
2772 psklen = PSK_MAX_PSK_LEN; /* Avoid overrunning the array on cleanse */
2774 } else if (psklen == 0) {
2775 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_PSK_IDENTITY_NOT_FOUND);
2779 identitylen = strlen(identity);
2780 if (identitylen > PSK_MAX_IDENTITY_LEN) {
2781 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2785 tmppsk = OPENSSL_memdup(psk, psklen);
2786 tmpidentity = OPENSSL_strdup(identity);
2787 if (tmppsk == NULL || tmpidentity == NULL) {
2788 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
2792 OPENSSL_free(s->s3.tmp.psk);
2793 s->s3.tmp.psk = tmppsk;
2794 s->s3.tmp.psklen = psklen;
2796 OPENSSL_free(s->session->psk_identity);
2797 s->session->psk_identity = tmpidentity;
2800 if (!WPACKET_sub_memcpy_u16(pkt, identity, identitylen)) {
2801 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2808 OPENSSL_cleanse(psk, psklen);
2809 OPENSSL_cleanse(identity, sizeof(identity));
2810 OPENSSL_clear_free(tmppsk, psklen);
2811 OPENSSL_clear_free(tmpidentity, identitylen);
2815 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2820 static int tls_construct_cke_rsa(SSL *s, WPACKET *pkt)
2822 unsigned char *encdata = NULL;
2823 EVP_PKEY *pkey = NULL;
2824 EVP_PKEY_CTX *pctx = NULL;
2826 unsigned char *pms = NULL;
2829 if (s->session->peer == NULL) {
2831 * We should always have a server certificate with SSL_kRSA.
2833 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2837 pkey = X509_get0_pubkey(s->session->peer);
2838 if (!EVP_PKEY_is_a(pkey, "RSA")) {
2839 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2843 pmslen = SSL_MAX_MASTER_KEY_LENGTH;
2844 pms = OPENSSL_malloc(pmslen);
2846 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
2850 pms[0] = s->client_version >> 8;
2851 pms[1] = s->client_version & 0xff;
2852 if (RAND_bytes_ex(s->ctx->libctx, pms + 2, pmslen - 2, 0) <= 0) {
2853 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
2857 /* Fix buf for TLS and beyond */
2858 if (s->version > SSL3_VERSION && !WPACKET_start_sub_packet_u16(pkt)) {
2859 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2863 pctx = EVP_PKEY_CTX_new_from_pkey(s->ctx->libctx, pkey, s->ctx->propq);
2864 if (pctx == NULL || EVP_PKEY_encrypt_init(pctx) <= 0
2865 || EVP_PKEY_encrypt(pctx, NULL, &enclen, pms, pmslen) <= 0) {
2866 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
2869 if (!WPACKET_allocate_bytes(pkt, enclen, &encdata)
2870 || EVP_PKEY_encrypt(pctx, encdata, &enclen, pms, pmslen) <= 0) {
2871 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_RSA_ENCRYPT);
2874 EVP_PKEY_CTX_free(pctx);
2877 /* Fix buf for TLS and beyond */
2878 if (s->version > SSL3_VERSION && !WPACKET_close(pkt)) {
2879 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2883 /* Log the premaster secret, if logging is enabled. */
2884 if (!ssl_log_rsa_client_key_exchange(s, encdata, enclen, pms, pmslen)) {
2885 /* SSLfatal() already called */
2889 s->s3.tmp.pms = pms;
2890 s->s3.tmp.pmslen = pmslen;
2894 OPENSSL_clear_free(pms, pmslen);
2895 EVP_PKEY_CTX_free(pctx);
2900 static int tls_construct_cke_dhe(SSL *s, WPACKET *pkt)
2902 EVP_PKEY *ckey = NULL, *skey = NULL;
2903 unsigned char *keybytes = NULL;
2905 unsigned char *encoded_pub = NULL;
2906 size_t encoded_pub_len, pad_len;
2909 skey = s->s3.peer_tmp;
2911 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2915 ckey = ssl_generate_pkey(s, skey);
2917 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2921 if (ssl_derive(s, ckey, skey, 0) == 0) {
2922 /* SSLfatal() already called */
2926 /* send off the data */
2928 /* Generate encoding of server key */
2929 encoded_pub_len = EVP_PKEY_get1_encoded_public_key(ckey, &encoded_pub);
2930 if (encoded_pub_len == 0) {
2931 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2932 EVP_PKEY_free(skey);
2933 return EXT_RETURN_FAIL;
2937 * For interoperability with some versions of the Microsoft TLS
2938 * stack, we need to zero pad the DHE pub key to the same length
2941 prime_len = EVP_PKEY_get_size(ckey);
2942 pad_len = prime_len - encoded_pub_len;
2944 if (!WPACKET_sub_allocate_bytes_u16(pkt, pad_len, &keybytes)) {
2945 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2948 memset(keybytes, 0, pad_len);
2951 if (!WPACKET_sub_memcpy_u16(pkt, encoded_pub, encoded_pub_len)) {
2952 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2958 OPENSSL_free(encoded_pub);
2959 EVP_PKEY_free(ckey);
2963 static int tls_construct_cke_ecdhe(SSL *s, WPACKET *pkt)
2965 unsigned char *encodedPoint = NULL;
2966 size_t encoded_pt_len = 0;
2967 EVP_PKEY *ckey = NULL, *skey = NULL;
2970 skey = s->s3.peer_tmp;
2972 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
2976 ckey = ssl_generate_pkey(s, skey);
2978 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
2982 if (ssl_derive(s, ckey, skey, 0) == 0) {
2983 /* SSLfatal() already called */
2987 /* Generate encoding of client key */
2988 encoded_pt_len = EVP_PKEY_get1_encoded_public_key(ckey, &encodedPoint);
2990 if (encoded_pt_len == 0) {
2991 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EC_LIB);
2995 if (!WPACKET_sub_memcpy_u8(pkt, encodedPoint, encoded_pt_len)) {
2996 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3002 OPENSSL_free(encodedPoint);
3003 EVP_PKEY_free(ckey);
3007 static int tls_construct_cke_gost(SSL *s, WPACKET *pkt)
3009 #ifndef OPENSSL_NO_GOST
3010 /* GOST key exchange message creation */
3011 EVP_PKEY_CTX *pkey_ctx = NULL;
3014 unsigned int md_len;
3015 unsigned char shared_ukm[32], tmp[256];
3016 EVP_MD_CTX *ukm_hash = NULL;
3017 int dgst_nid = NID_id_GostR3411_94;
3018 unsigned char *pms = NULL;
3021 if ((s->s3.tmp.new_cipher->algorithm_auth & SSL_aGOST12) != 0)
3022 dgst_nid = NID_id_GostR3411_2012_256;
3025 * Get server certificate PKEY and create ctx from it
3027 peer_cert = s->session->peer;
3028 if (peer_cert == NULL) {
3029 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
3030 SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
3034 pkey_ctx = EVP_PKEY_CTX_new_from_pkey(s->ctx->libctx,
3035 X509_get0_pubkey(peer_cert),
3037 if (pkey_ctx == NULL) {
3038 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
3042 * If we have send a certificate, and certificate key
3043 * parameters match those of server certificate, use
3044 * certificate key for key exchange
3047 /* Otherwise, generate ephemeral key pair */
3049 pms = OPENSSL_malloc(pmslen);
3051 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
3055 if (EVP_PKEY_encrypt_init(pkey_ctx) <= 0
3056 /* Generate session key
3058 || RAND_bytes_ex(s->ctx->libctx, pms, pmslen, 0) <= 0) {
3059 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3063 * Compute shared IV and store it in algorithm-specific context
3066 ukm_hash = EVP_MD_CTX_new();
3067 if (ukm_hash == NULL
3068 || EVP_DigestInit(ukm_hash, EVP_get_digestbynid(dgst_nid)) <= 0
3069 || EVP_DigestUpdate(ukm_hash, s->s3.client_random,
3070 SSL3_RANDOM_SIZE) <= 0
3071 || EVP_DigestUpdate(ukm_hash, s->s3.server_random,
3072 SSL3_RANDOM_SIZE) <= 0
3073 || EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len) <= 0) {
3074 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3077 EVP_MD_CTX_free(ukm_hash);
3079 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT,
3080 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) {
3081 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_LIBRARY_BUG);
3084 /* Make GOST keytransport blob message */
3086 * Encapsulate it into sequence
3089 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, pms, pmslen) <= 0) {
3090 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_LIBRARY_BUG);
3094 if (!WPACKET_put_bytes_u8(pkt, V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED)
3095 || (msglen >= 0x80 && !WPACKET_put_bytes_u8(pkt, 0x81))
3096 || !WPACKET_sub_memcpy_u8(pkt, tmp, msglen)) {
3097 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3101 EVP_PKEY_CTX_free(pkey_ctx);
3102 s->s3.tmp.pms = pms;
3103 s->s3.tmp.pmslen = pmslen;
3107 EVP_PKEY_CTX_free(pkey_ctx);
3108 OPENSSL_clear_free(pms, pmslen);
3109 EVP_MD_CTX_free(ukm_hash);
3112 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3117 #ifndef OPENSSL_NO_GOST
3118 int ossl_gost18_cke_cipher_nid(const SSL *s)
3120 if ((s->s3.tmp.new_cipher->algorithm_enc & SSL_MAGMA) != 0)
3121 return NID_magma_ctr;
3122 else if ((s->s3.tmp.new_cipher->algorithm_enc & SSL_KUZNYECHIK) != 0)
3123 return NID_kuznyechik_ctr;
3128 int ossl_gost_ukm(const SSL *s, unsigned char *dgst_buf)
3130 EVP_MD_CTX * hash = NULL;
3131 unsigned int md_len;
3132 const EVP_MD *md = ssl_evp_md_fetch(s->ctx->libctx, NID_id_GostR3411_2012_256, s->ctx->propq);
3137 if ((hash = EVP_MD_CTX_new()) == NULL
3138 || EVP_DigestInit(hash, md) <= 0
3139 || EVP_DigestUpdate(hash, s->s3.client_random, SSL3_RANDOM_SIZE) <= 0
3140 || EVP_DigestUpdate(hash, s->s3.server_random, SSL3_RANDOM_SIZE) <= 0
3141 || EVP_DigestFinal_ex(hash, dgst_buf, &md_len) <= 0) {
3142 EVP_MD_CTX_free(hash);
3143 ssl_evp_md_free(md);
3147 EVP_MD_CTX_free(hash);
3148 ssl_evp_md_free(md);
3153 static int tls_construct_cke_gost18(SSL *s, WPACKET *pkt)
3155 #ifndef OPENSSL_NO_GOST
3156 /* GOST 2018 key exchange message creation */
3157 unsigned char rnd_dgst[32], tmp[255];
3158 EVP_PKEY_CTX *pkey_ctx = NULL;
3160 unsigned char *pms = NULL;
3163 int cipher_nid = ossl_gost18_cke_cipher_nid(s);
3165 if (cipher_nid == NID_undef) {
3166 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3170 if (ossl_gost_ukm(s, rnd_dgst) <= 0) {
3171 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3175 /* Pre-master secret - random bytes */
3177 pms = OPENSSL_malloc(pmslen);
3179 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
3183 if (RAND_bytes_ex(s->ctx->libctx, pms, pmslen, 0) <= 0) {
3184 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3188 /* Get server certificate PKEY and create ctx from it */
3189 peer_cert = s->session->peer;
3190 if (peer_cert == NULL) {
3191 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
3192 SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
3196 pkey_ctx = EVP_PKEY_CTX_new_from_pkey(s->ctx->libctx,
3197 X509_get0_pubkey(peer_cert),
3199 if (pkey_ctx == NULL) {
3200 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
3204 if (EVP_PKEY_encrypt_init(pkey_ctx) <= 0 ) {
3205 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3209 /* Reuse EVP_PKEY_CTRL_SET_IV, make choice in engine code */
3210 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT,
3211 EVP_PKEY_CTRL_SET_IV, 32, rnd_dgst) < 0) {
3212 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_LIBRARY_BUG);
3216 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT,
3217 EVP_PKEY_CTRL_CIPHER, cipher_nid, NULL) < 0) {
3218 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_LIBRARY_BUG);
3223 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, pms, pmslen) <= 0) {
3224 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_LIBRARY_BUG);
3228 if (!WPACKET_memcpy(pkt, tmp, msglen)) {
3229 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3233 EVP_PKEY_CTX_free(pkey_ctx);
3234 s->s3.tmp.pms = pms;
3235 s->s3.tmp.pmslen = pmslen;
3239 EVP_PKEY_CTX_free(pkey_ctx);
3240 OPENSSL_clear_free(pms, pmslen);
3243 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3248 static int tls_construct_cke_srp(SSL *s, WPACKET *pkt)
3250 #ifndef OPENSSL_NO_SRP
3251 unsigned char *abytes = NULL;
3253 if (s->srp_ctx.A == NULL
3254 || !WPACKET_sub_allocate_bytes_u16(pkt, BN_num_bytes(s->srp_ctx.A),
3256 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3259 BN_bn2bin(s->srp_ctx.A, abytes);
3261 OPENSSL_free(s->session->srp_username);
3262 s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login);
3263 if (s->session->srp_username == NULL) {
3264 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
3270 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3275 int tls_construct_client_key_exchange(SSL *s, WPACKET *pkt)
3277 unsigned long alg_k;
3279 alg_k = s->s3.tmp.new_cipher->algorithm_mkey;
3282 * All of the construct functions below call SSLfatal() if necessary so
3283 * no need to do so here.
3285 if ((alg_k & SSL_PSK)
3286 && !tls_construct_cke_psk_preamble(s, pkt))
3289 if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) {
3290 if (!tls_construct_cke_rsa(s, pkt))
3292 } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) {
3293 if (!tls_construct_cke_dhe(s, pkt))
3295 } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) {
3296 if (!tls_construct_cke_ecdhe(s, pkt))
3298 } else if (alg_k & SSL_kGOST) {
3299 if (!tls_construct_cke_gost(s, pkt))
3301 } else if (alg_k & SSL_kGOST18) {
3302 if (!tls_construct_cke_gost18(s, pkt))
3304 } else if (alg_k & SSL_kSRP) {
3305 if (!tls_construct_cke_srp(s, pkt))
3307 } else if (!(alg_k & SSL_kPSK)) {
3308 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3314 OPENSSL_clear_free(s->s3.tmp.pms, s->s3.tmp.pmslen);
3315 s->s3.tmp.pms = NULL;
3316 s->s3.tmp.pmslen = 0;
3317 #ifndef OPENSSL_NO_PSK
3318 OPENSSL_clear_free(s->s3.tmp.psk, s->s3.tmp.psklen);
3319 s->s3.tmp.psk = NULL;
3320 s->s3.tmp.psklen = 0;
3325 int tls_client_key_exchange_post_work(SSL *s)
3327 unsigned char *pms = NULL;
3330 pms = s->s3.tmp.pms;
3331 pmslen = s->s3.tmp.pmslen;
3333 #ifndef OPENSSL_NO_SRP
3335 if (s->s3.tmp.new_cipher->algorithm_mkey & SSL_kSRP) {
3336 if (!srp_generate_client_master_secret(s)) {
3337 /* SSLfatal() already called */
3344 if (pms == NULL && !(s->s3.tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
3345 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
3348 if (!ssl_generate_master_secret(s, pms, pmslen, 1)) {
3349 /* SSLfatal() already called */
3350 /* ssl_generate_master_secret frees the pms even on error */
3358 #ifndef OPENSSL_NO_SCTP
3359 if (SSL_IS_DTLS(s)) {
3360 unsigned char sctpauthkey[64];
3361 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
3365 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
3368 memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
3369 sizeof(DTLS1_SCTP_AUTH_LABEL));
3371 /* Don't include the terminating zero. */
3372 labellen = sizeof(labelbuffer) - 1;
3373 if (s->mode & SSL_MODE_DTLS_SCTP_LABEL_LENGTH_BUG)
3376 if (SSL_export_keying_material(s, sctpauthkey,
3377 sizeof(sctpauthkey), labelbuffer,
3378 labellen, NULL, 0, 0) <= 0) {
3379 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3383 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
3384 sizeof(sctpauthkey), sctpauthkey);
3390 OPENSSL_clear_free(pms, pmslen);
3391 s->s3.tmp.pms = NULL;
3392 s->s3.tmp.pmslen = 0;
3397 * Check a certificate can be used for client authentication. Currently check
3398 * cert exists, if we have a suitable digest for TLS 1.2 if static DH client
3399 * certificates can be used and optionally checks suitability for Suite B.
3401 static int ssl3_check_client_certificate(SSL *s)
3403 /* If no suitable signature algorithm can't use certificate */
3404 if (!tls_choose_sigalg(s, 0) || s->s3.tmp.sigalg == NULL)
3407 * If strict mode check suitability of chain before using it. This also
3408 * adjusts suite B digest if necessary.
3410 if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3411 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3416 WORK_STATE tls_prepare_client_certificate(SSL *s, WORK_STATE wst)
3419 EVP_PKEY *pkey = NULL;
3422 if (wst == WORK_MORE_A) {
3423 /* Let cert callback update client certificates if required */
3424 if (s->cert->cert_cb) {
3425 i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3427 s->rwstate = SSL_X509_LOOKUP;
3431 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_CALLBACK_FAILED);
3434 s->rwstate = SSL_NOTHING;
3436 if (ssl3_check_client_certificate(s)) {
3437 if (s->post_handshake_auth == SSL_PHA_REQUESTED) {
3438 return WORK_FINISHED_STOP;
3440 return WORK_FINISHED_CONTINUE;
3443 /* Fall through to WORK_MORE_B */
3447 /* We need to get a client cert */
3448 if (wst == WORK_MORE_B) {
3450 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
3451 * return(-1); We then get retied later
3453 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3455 s->rwstate = SSL_X509_LOOKUP;
3458 s->rwstate = SSL_NOTHING;
3459 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
3460 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
3462 } else if (i == 1) {
3464 ERR_raise(ERR_LIB_SSL, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3468 EVP_PKEY_free(pkey);
3469 if (i && !ssl3_check_client_certificate(s))
3472 if (s->version == SSL3_VERSION) {
3473 s->s3.tmp.cert_req = 0;
3474 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
3475 return WORK_FINISHED_CONTINUE;
3477 s->s3.tmp.cert_req = 2;
3478 if (!ssl3_digest_cached_records(s, 0)) {
3479 /* SSLfatal() already called */
3485 if (s->post_handshake_auth == SSL_PHA_REQUESTED)
3486 return WORK_FINISHED_STOP;
3487 return WORK_FINISHED_CONTINUE;
3490 /* Shouldn't ever get here */
3491 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3495 int tls_construct_client_certificate(SSL *s, WPACKET *pkt)
3497 if (SSL_IS_TLS13(s)) {
3498 if (s->pha_context == NULL) {
3499 /* no context available, add 0-length context */
3500 if (!WPACKET_put_bytes_u8(pkt, 0)) {
3501 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3504 } else if (!WPACKET_sub_memcpy_u8(pkt, s->pha_context, s->pha_context_len)) {
3505 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3509 if (!ssl3_output_cert_chain(s, pkt,
3510 (s->s3.tmp.cert_req == 2) ? NULL
3512 /* SSLfatal() already called */
3517 && SSL_IS_FIRST_HANDSHAKE(s)
3518 && (!s->method->ssl3_enc->change_cipher_state(s,
3519 SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_CLIENT_WRITE))) {
3521 * This is a fatal error, which leaves enc_write_ctx in an inconsistent
3522 * state and thus ssl3_send_alert may crash.
3524 SSLfatal(s, SSL_AD_NO_ALERT, SSL_R_CANNOT_CHANGE_CIPHER);
3531 int ssl3_check_cert_and_algorithm(SSL *s)
3533 const SSL_CERT_LOOKUP *clu;
3537 alg_k = s->s3.tmp.new_cipher->algorithm_mkey;
3538 alg_a = s->s3.tmp.new_cipher->algorithm_auth;
3540 /* we don't have a certificate */
3541 if (!(alg_a & SSL_aCERT))
3544 /* This is the passed certificate */
3545 clu = ssl_cert_lookup_by_pkey(X509_get0_pubkey(s->session->peer), &idx);
3547 /* Check certificate is recognised and suitable for cipher */
3548 if (clu == NULL || (alg_a & clu->amask) == 0) {
3549 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_MISSING_SIGNING_CERT);
3553 if (clu->amask & SSL_aECDSA) {
3554 if (ssl_check_srvr_ecc_cert_and_alg(s->session->peer, s))
3556 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_BAD_ECC_CERT);
3560 if (alg_k & (SSL_kRSA | SSL_kRSAPSK) && idx != SSL_PKEY_RSA) {
3561 SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
3562 SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3566 if ((alg_k & SSL_kDHE) && (s->s3.peer_tmp == NULL)) {
3567 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3574 #ifndef OPENSSL_NO_NEXTPROTONEG
3575 int tls_construct_next_proto(SSL *s, WPACKET *pkt)
3577 size_t len, padding_len;
3578 unsigned char *padding = NULL;
3580 len = s->ext.npn_len;
3581 padding_len = 32 - ((len + 2) % 32);
3583 if (!WPACKET_sub_memcpy_u8(pkt, s->ext.npn, len)
3584 || !WPACKET_sub_allocate_bytes_u8(pkt, padding_len, &padding)) {
3585 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3589 memset(padding, 0, padding_len);
3595 MSG_PROCESS_RETURN tls_process_hello_req(SSL *s, PACKET *pkt)
3597 if (PACKET_remaining(pkt) > 0) {
3598 /* should contain no data */
3599 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
3600 return MSG_PROCESS_ERROR;
3603 if ((s->options & SSL_OP_NO_RENEGOTIATION)) {
3604 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_RENEGOTIATION);
3605 return MSG_PROCESS_FINISHED_READING;
3609 * This is a historical discrepancy (not in the RFC) maintained for
3610 * compatibility reasons. If a TLS client receives a HelloRequest it will
3611 * attempt an abbreviated handshake. However if a DTLS client receives a
3612 * HelloRequest it will do a full handshake. Either behaviour is reasonable
3613 * but doing one for TLS and another for DTLS is odd.
3618 SSL_renegotiate_abbreviated(s);
3620 return MSG_PROCESS_FINISHED_READING;
3623 static MSG_PROCESS_RETURN tls_process_encrypted_extensions(SSL *s, PACKET *pkt)
3626 RAW_EXTENSION *rawexts = NULL;
3628 if (!PACKET_as_length_prefixed_2(pkt, &extensions)
3629 || PACKET_remaining(pkt) != 0) {
3630 SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
3634 if (!tls_collect_extensions(s, &extensions,
3635 SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS, &rawexts,
3637 || !tls_parse_all_extensions(s, SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
3638 rawexts, NULL, 0, 1)) {
3639 /* SSLfatal() already called */
3643 OPENSSL_free(rawexts);
3644 return MSG_PROCESS_CONTINUE_READING;
3647 OPENSSL_free(rawexts);
3648 return MSG_PROCESS_ERROR;
3651 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3654 #ifndef OPENSSL_NO_ENGINE
3655 if (s->ctx->client_cert_engine) {
3656 i = tls_engine_load_ssl_client_cert(s, px509, ppkey);
3661 if (s->ctx->client_cert_cb)
3662 i = s->ctx->client_cert_cb(s, px509, ppkey);
3666 int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk, WPACKET *pkt)
3669 size_t totlen = 0, len, maxlen, maxverok = 0;
3670 int empty_reneg_info_scsv = !s->renegotiate;
3672 /* Set disabled masks for this session */
3673 if (!ssl_set_client_disabled(s)) {
3674 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_NO_PROTOCOLS_AVAILABLE);
3679 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3683 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
3684 # if OPENSSL_MAX_TLS1_2_CIPHER_LENGTH < 6
3685 # error Max cipher length too short
3688 * Some servers hang if client hello > 256 bytes as hack workaround
3689 * chop number of supported ciphers to keep it well below this if we
3692 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3693 maxlen = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
3696 /* Maximum length that can be stored in 2 bytes. Length must be even */
3699 if (empty_reneg_info_scsv)
3701 if (s->mode & SSL_MODE_SEND_FALLBACK_SCSV)
3704 for (i = 0; i < sk_SSL_CIPHER_num(sk) && totlen < maxlen; i++) {
3705 const SSL_CIPHER *c;
3707 c = sk_SSL_CIPHER_value(sk, i);
3708 /* Skip disabled ciphers */
3709 if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_SUPPORTED, 0))
3712 if (!s->method->put_cipher_by_char(c, pkt, &len)) {
3713 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3717 /* Sanity check that the maximum version we offer has ciphers enabled */
3719 if (SSL_IS_DTLS(s)) {
3720 if (DTLS_VERSION_GE(c->max_dtls, s->s3.tmp.max_ver)
3721 && DTLS_VERSION_LE(c->min_dtls, s->s3.tmp.max_ver))
3724 if (c->max_tls >= s->s3.tmp.max_ver
3725 && c->min_tls <= s->s3.tmp.max_ver)
3733 if (totlen == 0 || !maxverok) {
3734 const char *maxvertext =
3736 ? "No ciphers enabled for max supported SSL/TLS version"
3739 SSLfatal_data(s, SSL_AD_INTERNAL_ERROR, SSL_R_NO_CIPHERS_AVAILABLE,
3745 if (empty_reneg_info_scsv) {
3746 static SSL_CIPHER scsv = {
3747 0, NULL, NULL, SSL3_CK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
3749 if (!s->method->put_cipher_by_char(&scsv, pkt, &len)) {
3750 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3754 if (s->mode & SSL_MODE_SEND_FALLBACK_SCSV) {
3755 static SSL_CIPHER scsv = {
3756 0, NULL, NULL, SSL3_CK_FALLBACK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
3758 if (!s->method->put_cipher_by_char(&scsv, pkt, &len)) {
3759 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
3768 int tls_construct_end_of_early_data(SSL *s, WPACKET *pkt)
3770 if (s->early_data_state != SSL_EARLY_DATA_WRITE_RETRY
3771 && s->early_data_state != SSL_EARLY_DATA_FINISHED_WRITING) {
3772 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
3776 s->early_data_state = SSL_EARLY_DATA_FINISHED_WRITING;