2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 /* ====================================================================
11 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
13 * Portions of the attached software ("Contribution") are developed by
14 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
16 * The Contribution is licensed pursuant to the OpenSSL open source
17 * license provided above.
19 * ECC cipher suite support in OpenSSL originally written by
20 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
23 /* ====================================================================
24 * Copyright 2005 Nokia. All rights reserved.
26 * The portions of the attached software ("Contribution") is developed by
27 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
30 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
31 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
32 * support (see RFC 4279) to OpenSSL.
34 * No patent licenses or other rights except those expressly stated in
35 * the OpenSSL open source license shall be deemed granted or received
36 * expressly, by implication, estoppel, or otherwise.
38 * No assurances are provided by Nokia that the Contribution does not
39 * infringe the patent or other intellectual property rights of any third
40 * party or that the license provides you with all the necessary rights
41 * to make use of the Contribution.
43 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
44 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
45 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
46 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
51 #include "../ssl_locl.h"
52 #include "statem_locl.h"
53 #include "internal/constant_time_locl.h"
54 #include <openssl/buffer.h>
55 #include <openssl/rand.h>
56 #include <openssl/objects.h>
57 #include <openssl/evp.h>
58 #include <openssl/hmac.h>
59 #include <openssl/x509.h>
60 #include <openssl/dh.h>
61 #include <openssl/bn.h>
62 #include <openssl/md5.h>
64 static int tls_construct_encrypted_extensions(SSL *s, WPACKET *pkt);
65 static STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,
66 PACKET *cipher_suites,
68 **skp, int sslv2format,
72 * ossl_statem_server13_read_transition() encapsulates the logic for the allowed
73 * handshake state transitions when a TLSv1.3 server is reading messages from
74 * the client. The message type that the client has sent is provided in |mt|.
75 * The current state is in |s->statem.hand_state|.
77 * Return values are 1 for success (transition allowed) and 0 on error
78 * (transition not allowed)
80 static int ossl_statem_server13_read_transition(SSL *s, int mt)
82 OSSL_STATEM *st = &s->statem;
85 * TODO(TLS1.3): This is still based on the TLSv1.2 state machine. Over time
86 * we will update this to look more like real TLSv1.3
90 * Note: There is no case for TLS_ST_BEFORE because at that stage we have
91 * not negotiated TLSv1.3 yet, so that case is handled by
92 * ossl_statem_server_read_transition()
94 switch (st->hand_state) {
98 case TLS_ST_SW_FINISHED:
99 if (s->s3->tmp.cert_request) {
100 if (mt == SSL3_MT_CERTIFICATE) {
101 st->hand_state = TLS_ST_SR_CERT;
105 if (mt == SSL3_MT_FINISHED) {
106 st->hand_state = TLS_ST_SR_FINISHED;
113 if (s->session->peer == NULL) {
114 if (mt == SSL3_MT_FINISHED) {
115 st->hand_state = TLS_ST_SR_FINISHED;
119 if (mt == SSL3_MT_CERTIFICATE_VERIFY) {
120 st->hand_state = TLS_ST_SR_CERT_VRFY;
126 case TLS_ST_SR_CERT_VRFY:
127 if (mt == SSL3_MT_FINISHED) {
128 st->hand_state = TLS_ST_SR_FINISHED;
134 /* No valid transition found */
135 ssl3_send_alert(s, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE);
136 SSLerr(SSL_F_OSSL_STATEM_SERVER13_READ_TRANSITION,
137 SSL_R_UNEXPECTED_MESSAGE);
142 * ossl_statem_server_read_transition() encapsulates the logic for the allowed
143 * handshake state transitions when the server is reading messages from the
144 * client. The message type that the client has sent is provided in |mt|. The
145 * current state is in |s->statem.hand_state|.
147 * Return values are 1 for success (transition allowed) and 0 on error
148 * (transition not allowed)
150 int ossl_statem_server_read_transition(SSL *s, int mt)
152 OSSL_STATEM *st = &s->statem;
154 if (SSL_IS_TLS13(s)) {
155 if (!ossl_statem_server13_read_transition(s, mt))
160 switch (st->hand_state) {
165 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
166 if (mt == SSL3_MT_CLIENT_HELLO) {
167 st->hand_state = TLS_ST_SR_CLNT_HELLO;
172 case TLS_ST_SW_SRVR_DONE:
174 * If we get a CKE message after a ServerDone then either
175 * 1) We didn't request a Certificate
177 * 2) If we did request one then
178 * a) We allow no Certificate to be returned
180 * b) We are running SSL3 (in TLS1.0+ the client must return a 0
181 * list if we requested a certificate)
183 if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) {
184 if (s->s3->tmp.cert_request) {
185 if (s->version == SSL3_VERSION) {
186 if ((s->verify_mode & SSL_VERIFY_PEER)
187 && (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
189 * This isn't an unexpected message as such - we're just
190 * not going to accept it because we require a client
193 ssl3_send_alert(s, SSL3_AL_FATAL,
194 SSL3_AD_HANDSHAKE_FAILURE);
195 SSLerr(SSL_F_OSSL_STATEM_SERVER_READ_TRANSITION,
196 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
199 st->hand_state = TLS_ST_SR_KEY_EXCH;
203 st->hand_state = TLS_ST_SR_KEY_EXCH;
206 } else if (s->s3->tmp.cert_request) {
207 if (mt == SSL3_MT_CERTIFICATE) {
208 st->hand_state = TLS_ST_SR_CERT;
215 if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) {
216 st->hand_state = TLS_ST_SR_KEY_EXCH;
221 case TLS_ST_SR_KEY_EXCH:
223 * We should only process a CertificateVerify message if we have
224 * received a Certificate from the client. If so then |s->session->peer|
225 * will be non NULL. In some instances a CertificateVerify message is
226 * not required even if the peer has sent a Certificate (e.g. such as in
227 * the case of static DH). In that case |st->no_cert_verify| should be
230 if (s->session->peer == NULL || st->no_cert_verify) {
231 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
233 * For the ECDH ciphersuites when the client sends its ECDH
234 * pub key in a certificate, the CertificateVerify message is
235 * not sent. Also for GOST ciphersuites when the client uses
236 * its key from the certificate for key exchange.
238 st->hand_state = TLS_ST_SR_CHANGE;
242 if (mt == SSL3_MT_CERTIFICATE_VERIFY) {
243 st->hand_state = TLS_ST_SR_CERT_VRFY;
249 case TLS_ST_SR_CERT_VRFY:
250 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
251 st->hand_state = TLS_ST_SR_CHANGE;
256 case TLS_ST_SR_CHANGE:
257 #ifndef OPENSSL_NO_NEXTPROTONEG
258 if (s->s3->next_proto_neg_seen) {
259 if (mt == SSL3_MT_NEXT_PROTO) {
260 st->hand_state = TLS_ST_SR_NEXT_PROTO;
265 if (mt == SSL3_MT_FINISHED) {
266 st->hand_state = TLS_ST_SR_FINISHED;
269 #ifndef OPENSSL_NO_NEXTPROTONEG
274 #ifndef OPENSSL_NO_NEXTPROTONEG
275 case TLS_ST_SR_NEXT_PROTO:
276 if (mt == SSL3_MT_FINISHED) {
277 st->hand_state = TLS_ST_SR_FINISHED;
283 case TLS_ST_SW_FINISHED:
284 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
285 st->hand_state = TLS_ST_SR_CHANGE;
292 /* No valid transition found */
293 ssl3_send_alert(s, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE);
294 SSLerr(SSL_F_OSSL_STATEM_SERVER_READ_TRANSITION, SSL_R_UNEXPECTED_MESSAGE);
299 * Should we send a ServerKeyExchange message?
301 * Valid return values are:
305 static int send_server_key_exchange(SSL *s)
307 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
310 * only send a ServerKeyExchange if DH or fortezza but we have a
311 * sign only certificate PSK: may send PSK identity hints For
312 * ECC ciphersuites, we send a serverKeyExchange message only if
313 * the cipher suite is either ECDH-anon or ECDHE. In other cases,
314 * the server certificate contains the server's public key for
317 if (alg_k & (SSL_kDHE | SSL_kECDHE)
319 * PSK: send ServerKeyExchange if PSK identity hint if
322 #ifndef OPENSSL_NO_PSK
323 /* Only send SKE if we have identity hint for plain PSK */
324 || ((alg_k & (SSL_kPSK | SSL_kRSAPSK))
325 && s->cert->psk_identity_hint)
326 /* For other PSK always send SKE */
327 || (alg_k & (SSL_PSK & (SSL_kDHEPSK | SSL_kECDHEPSK)))
329 #ifndef OPENSSL_NO_SRP
330 /* SRP: send ServerKeyExchange */
331 || (alg_k & SSL_kSRP)
341 * Should we send a CertificateRequest message?
343 * Valid return values are:
347 static int send_certificate_request(SSL *s)
350 /* don't request cert unless asked for it: */
351 s->verify_mode & SSL_VERIFY_PEER
353 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
354 * during re-negotiation:
356 && ((s->session->peer == NULL) ||
357 !(s->verify_mode & SSL_VERIFY_CLIENT_ONCE))
359 * never request cert in anonymous ciphersuites (see
360 * section "Certificate request" in SSL 3 drafts and in
363 && (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
365 * ... except when the application insists on
366 * verification (against the specs, but statem_clnt.c accepts
369 || (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
370 /* don't request certificate for SRP auth */
371 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP)
373 * With normal PSK Certificates and Certificate Requests
376 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aPSK)) {
384 * ossl_statem_server13_write_transition() works out what handshake state to
385 * move to next when a TLSv1.3 server is writing messages to be sent to the
388 static WRITE_TRAN ossl_statem_server13_write_transition(SSL *s)
390 OSSL_STATEM *st = &s->statem;
393 * TODO(TLS1.3): This is still based on the TLSv1.2 state machine. Over time
394 * we will update this to look more like real TLSv1.3
398 * No case for TLS_ST_BEFORE, because at that stage we have not negotiated
399 * TLSv1.3 yet, so that is handled by ossl_statem_server_write_transition()
402 switch (st->hand_state) {
404 /* Shouldn't happen */
405 return WRITE_TRAN_ERROR;
407 case TLS_ST_SR_CLNT_HELLO:
408 st->hand_state = TLS_ST_SW_SRVR_HELLO;
409 return WRITE_TRAN_CONTINUE;
411 case TLS_ST_SW_SRVR_HELLO:
412 st->hand_state = TLS_ST_SW_ENCRYPTED_EXTENSIONS;
413 return WRITE_TRAN_CONTINUE;
415 case TLS_ST_SW_ENCRYPTED_EXTENSIONS:
417 st->hand_state = TLS_ST_SW_FINISHED;
418 else if (send_certificate_request(s))
419 st->hand_state = TLS_ST_SW_CERT_REQ;
421 st->hand_state = TLS_ST_SW_CERT;
423 return WRITE_TRAN_CONTINUE;
425 case TLS_ST_SW_CERT_REQ:
426 st->hand_state = TLS_ST_SW_CERT;
427 return WRITE_TRAN_CONTINUE;
430 st->hand_state = s->tlsext_status_expected ? TLS_ST_SW_CERT_STATUS
431 : TLS_ST_SW_FINISHED;
432 return WRITE_TRAN_CONTINUE;
434 case TLS_ST_SW_CERT_STATUS:
435 st->hand_state = TLS_ST_SW_FINISHED;
436 return WRITE_TRAN_CONTINUE;
438 case TLS_ST_SW_FINISHED:
439 return WRITE_TRAN_FINISHED;
441 case TLS_ST_SR_FINISHED:
442 st->hand_state = TLS_ST_OK;
443 ossl_statem_set_in_init(s, 0);
444 return WRITE_TRAN_CONTINUE;
449 * ossl_statem_server_write_transition() works out what handshake state to move
450 * to next when the server is writing messages to be sent to the client.
452 WRITE_TRAN ossl_statem_server_write_transition(SSL *s)
454 OSSL_STATEM *st = &s->statem;
457 * Note that before the ClientHello we don't know what version we are going
458 * to negotiate yet, so we don't take this branch until later
462 return ossl_statem_server13_write_transition(s);
464 switch (st->hand_state) {
466 /* Shouldn't happen */
467 return WRITE_TRAN_ERROR;
470 /* Just go straight to trying to read from the client */
471 return WRITE_TRAN_FINISHED;
474 /* We must be trying to renegotiate */
475 st->hand_state = TLS_ST_SW_HELLO_REQ;
476 return WRITE_TRAN_CONTINUE;
478 case TLS_ST_SW_HELLO_REQ:
479 st->hand_state = TLS_ST_OK;
480 ossl_statem_set_in_init(s, 0);
481 return WRITE_TRAN_CONTINUE;
483 case TLS_ST_SR_CLNT_HELLO:
484 if (SSL_IS_DTLS(s) && !s->d1->cookie_verified
485 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
486 st->hand_state = DTLS_ST_SW_HELLO_VERIFY_REQUEST;
488 st->hand_state = TLS_ST_SW_SRVR_HELLO;
489 return WRITE_TRAN_CONTINUE;
491 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
492 return WRITE_TRAN_FINISHED;
494 case TLS_ST_SW_SRVR_HELLO:
496 if (s->tlsext_ticket_expected)
497 st->hand_state = TLS_ST_SW_SESSION_TICKET;
499 st->hand_state = TLS_ST_SW_CHANGE;
501 /* Check if it is anon DH or anon ECDH, */
502 /* normal PSK or SRP */
503 if (!(s->s3->tmp.new_cipher->algorithm_auth &
504 (SSL_aNULL | SSL_aSRP | SSL_aPSK))) {
505 st->hand_state = TLS_ST_SW_CERT;
506 } else if (send_server_key_exchange(s)) {
507 st->hand_state = TLS_ST_SW_KEY_EXCH;
508 } else if (send_certificate_request(s)) {
509 st->hand_state = TLS_ST_SW_CERT_REQ;
511 st->hand_state = TLS_ST_SW_SRVR_DONE;
514 return WRITE_TRAN_CONTINUE;
517 if (s->tlsext_status_expected) {
518 st->hand_state = TLS_ST_SW_CERT_STATUS;
519 return WRITE_TRAN_CONTINUE;
523 case TLS_ST_SW_CERT_STATUS:
524 if (send_server_key_exchange(s)) {
525 st->hand_state = TLS_ST_SW_KEY_EXCH;
526 return WRITE_TRAN_CONTINUE;
530 case TLS_ST_SW_KEY_EXCH:
531 if (send_certificate_request(s)) {
532 st->hand_state = TLS_ST_SW_CERT_REQ;
533 return WRITE_TRAN_CONTINUE;
537 case TLS_ST_SW_CERT_REQ:
538 st->hand_state = TLS_ST_SW_SRVR_DONE;
539 return WRITE_TRAN_CONTINUE;
541 case TLS_ST_SW_SRVR_DONE:
542 return WRITE_TRAN_FINISHED;
544 case TLS_ST_SR_FINISHED:
546 st->hand_state = TLS_ST_OK;
547 ossl_statem_set_in_init(s, 0);
548 return WRITE_TRAN_CONTINUE;
549 } else if (s->tlsext_ticket_expected) {
550 st->hand_state = TLS_ST_SW_SESSION_TICKET;
552 st->hand_state = TLS_ST_SW_CHANGE;
554 return WRITE_TRAN_CONTINUE;
556 case TLS_ST_SW_SESSION_TICKET:
557 st->hand_state = TLS_ST_SW_CHANGE;
558 return WRITE_TRAN_CONTINUE;
560 case TLS_ST_SW_CHANGE:
561 st->hand_state = TLS_ST_SW_FINISHED;
562 return WRITE_TRAN_CONTINUE;
564 case TLS_ST_SW_FINISHED:
566 return WRITE_TRAN_FINISHED;
568 st->hand_state = TLS_ST_OK;
569 ossl_statem_set_in_init(s, 0);
570 return WRITE_TRAN_CONTINUE;
575 * Perform any pre work that needs to be done prior to sending a message from
576 * the server to the client.
578 WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst)
580 OSSL_STATEM *st = &s->statem;
582 switch (st->hand_state) {
584 /* No pre work to be done */
587 case TLS_ST_SW_HELLO_REQ:
590 dtls1_clear_sent_buffer(s);
593 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
595 if (SSL_IS_DTLS(s)) {
596 dtls1_clear_sent_buffer(s);
597 /* We don't buffer this message so don't use the timer */
602 case TLS_ST_SW_SRVR_HELLO:
603 if (SSL_IS_DTLS(s)) {
605 * Messages we write from now on should be bufferred and
606 * retransmitted if necessary, so we need to use the timer now
612 case TLS_ST_SW_SRVR_DONE:
613 #ifndef OPENSSL_NO_SCTP
614 if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s)))
615 return dtls_wait_for_dry(s);
617 return WORK_FINISHED_CONTINUE;
619 case TLS_ST_SW_SESSION_TICKET:
620 if (SSL_IS_DTLS(s)) {
622 * We're into the last flight. We don't retransmit the last flight
623 * unless we need to, so we don't use the timer
629 case TLS_ST_SW_CHANGE:
630 s->session->cipher = s->s3->tmp.new_cipher;
631 if (!s->method->ssl3_enc->setup_key_block(s)) {
632 ossl_statem_set_error(s);
635 if (SSL_IS_DTLS(s)) {
637 * We're into the last flight. We don't retransmit the last flight
638 * unless we need to, so we don't use the timer. This might have
639 * already been set to 0 if we sent a NewSessionTicket message,
640 * but we'll set it again here in case we didn't.
644 return WORK_FINISHED_CONTINUE;
647 return tls_finish_handshake(s, wst);
650 return WORK_FINISHED_CONTINUE;
654 * Perform any work that needs to be done after sending a message from the
655 * server to the client.
657 WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst)
659 OSSL_STATEM *st = &s->statem;
663 switch (st->hand_state) {
665 /* No post work to be done */
668 case TLS_ST_SW_HELLO_REQ:
669 if (statem_flush(s) != 1)
671 if (!ssl3_init_finished_mac(s)) {
672 ossl_statem_set_error(s);
677 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
678 if (statem_flush(s) != 1)
680 /* HelloVerifyRequest resets Finished MAC */
681 if (s->version != DTLS1_BAD_VER && !ssl3_init_finished_mac(s)) {
682 ossl_statem_set_error(s);
686 * The next message should be another ClientHello which we need to
687 * treat like it was the first packet
692 case TLS_ST_SW_SRVR_HELLO:
693 #ifndef OPENSSL_NO_SCTP
694 if (SSL_IS_DTLS(s) && s->hit) {
695 unsigned char sctpauthkey[64];
696 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
699 * Add new shared key for SCTP-Auth, will be ignored if no
702 memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
703 sizeof(DTLS1_SCTP_AUTH_LABEL));
705 if (SSL_export_keying_material(s, sctpauthkey,
706 sizeof(sctpauthkey), labelbuffer,
707 sizeof(labelbuffer), NULL, 0,
709 ossl_statem_set_error(s);
713 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
714 sizeof(sctpauthkey), sctpauthkey);
718 * TODO(TLS1.3): This actually causes a problem. We don't yet know
719 * whether the next record we are going to receive is an unencrypted
720 * alert, or an encrypted handshake message. We're going to need
721 * something clever in the record layer for this.
723 if (SSL_IS_TLS13(s)) {
724 if (!s->method->ssl3_enc->setup_key_block(s)
725 || !s->method->ssl3_enc->change_cipher_state(s,
726 SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_SERVER_WRITE)
727 || !s->method->ssl3_enc->change_cipher_state(s,
728 SSL3_CC_HANDSHAKE |SSL3_CHANGE_CIPHER_SERVER_READ))
733 case TLS_ST_SW_CHANGE:
734 #ifndef OPENSSL_NO_SCTP
735 if (SSL_IS_DTLS(s) && !s->hit) {
737 * Change to new shared key of SCTP-Auth, will be ignored if
740 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
744 if (!s->method->ssl3_enc->change_cipher_state(s,
745 SSL3_CHANGE_CIPHER_SERVER_WRITE))
747 ossl_statem_set_error(s);
752 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
755 case TLS_ST_SW_SRVR_DONE:
756 if (statem_flush(s) != 1)
760 case TLS_ST_SW_FINISHED:
761 if (statem_flush(s) != 1)
763 #ifndef OPENSSL_NO_SCTP
764 if (SSL_IS_DTLS(s) && s->hit) {
766 * Change to new shared key of SCTP-Auth, will be ignored if
769 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
773 if (SSL_IS_TLS13(s)) {
774 if (!s->method->ssl3_enc->generate_master_secret(s,
775 s->session->master_key, s->handshake_secret, 0,
776 &s->session->master_key_length)
777 || !s->method->ssl3_enc->change_cipher_state(s,
778 SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_SERVER_WRITE))
784 return WORK_FINISHED_CONTINUE;
788 * Get the message construction function and message type for sending from the
791 * Valid return values are:
795 int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt,
796 confunc_f *confunc, int *mt)
798 OSSL_STATEM *st = &s->statem;
800 switch (st->hand_state) {
802 /* Shouldn't happen */
805 case TLS_ST_SW_CHANGE:
807 *confunc = dtls_construct_change_cipher_spec;
809 *confunc = tls_construct_change_cipher_spec;
810 *mt = SSL3_MT_CHANGE_CIPHER_SPEC;
813 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
814 *confunc = dtls_construct_hello_verify_request;
815 *mt = DTLS1_MT_HELLO_VERIFY_REQUEST;
818 case TLS_ST_SW_HELLO_REQ:
819 /* No construction function needed */
821 *mt = SSL3_MT_HELLO_REQUEST;
824 case TLS_ST_SW_SRVR_HELLO:
825 *confunc = tls_construct_server_hello;
826 *mt = SSL3_MT_SERVER_HELLO;
830 *confunc = tls_construct_server_certificate;
831 *mt = SSL3_MT_CERTIFICATE;
834 case TLS_ST_SW_KEY_EXCH:
835 *confunc = tls_construct_server_key_exchange;
836 *mt = SSL3_MT_SERVER_KEY_EXCHANGE;
839 case TLS_ST_SW_CERT_REQ:
840 *confunc = tls_construct_certificate_request;
841 *mt = SSL3_MT_CERTIFICATE_REQUEST;
844 case TLS_ST_SW_SRVR_DONE:
845 *confunc = tls_construct_server_done;
846 *mt = SSL3_MT_SERVER_DONE;
849 case TLS_ST_SW_SESSION_TICKET:
850 *confunc = tls_construct_new_session_ticket;
851 *mt = SSL3_MT_NEWSESSION_TICKET;
854 case TLS_ST_SW_CERT_STATUS:
855 *confunc = tls_construct_cert_status;
856 *mt = SSL3_MT_CERTIFICATE_STATUS;
859 case TLS_ST_SW_FINISHED:
860 *confunc = tls_construct_finished;
861 *mt = SSL3_MT_FINISHED;
864 case TLS_ST_SW_ENCRYPTED_EXTENSIONS:
865 *confunc = tls_construct_encrypted_extensions;
866 *mt = SSL3_MT_ENCRYPTED_EXTENSIONS;
874 * Maximum size (excluding the Handshake header) of a ClientHello message,
875 * calculated as follows:
877 * 2 + # client_version
878 * 32 + # only valid length for random
879 * 1 + # length of session_id
880 * 32 + # maximum size for session_id
881 * 2 + # length of cipher suites
882 * 2^16-2 + # maximum length of cipher suites array
883 * 1 + # length of compression_methods
884 * 2^8-1 + # maximum length of compression methods
885 * 2 + # length of extensions
886 * 2^16-1 # maximum length of extensions
888 #define CLIENT_HELLO_MAX_LENGTH 131396
890 #define CLIENT_KEY_EXCH_MAX_LENGTH 2048
891 #define NEXT_PROTO_MAX_LENGTH 514
894 * Returns the maximum allowed length for the current message that we are
895 * reading. Excludes the message header.
897 size_t ossl_statem_server_max_message_size(SSL *s)
899 OSSL_STATEM *st = &s->statem;
901 switch (st->hand_state) {
903 /* Shouldn't happen */
906 case TLS_ST_SR_CLNT_HELLO:
907 return CLIENT_HELLO_MAX_LENGTH;
910 return s->max_cert_list;
912 case TLS_ST_SR_KEY_EXCH:
913 return CLIENT_KEY_EXCH_MAX_LENGTH;
915 case TLS_ST_SR_CERT_VRFY:
916 return SSL3_RT_MAX_PLAIN_LENGTH;
918 #ifndef OPENSSL_NO_NEXTPROTONEG
919 case TLS_ST_SR_NEXT_PROTO:
920 return NEXT_PROTO_MAX_LENGTH;
923 case TLS_ST_SR_CHANGE:
924 return CCS_MAX_LENGTH;
926 case TLS_ST_SR_FINISHED:
927 return FINISHED_MAX_LENGTH;
932 * Process a message that the server has received from the client.
934 MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt)
936 OSSL_STATEM *st = &s->statem;
938 switch (st->hand_state) {
940 /* Shouldn't happen */
941 return MSG_PROCESS_ERROR;
943 case TLS_ST_SR_CLNT_HELLO:
944 return tls_process_client_hello(s, pkt);
947 return tls_process_client_certificate(s, pkt);
949 case TLS_ST_SR_KEY_EXCH:
950 return tls_process_client_key_exchange(s, pkt);
952 case TLS_ST_SR_CERT_VRFY:
953 return tls_process_cert_verify(s, pkt);
955 #ifndef OPENSSL_NO_NEXTPROTONEG
956 case TLS_ST_SR_NEXT_PROTO:
957 return tls_process_next_proto(s, pkt);
960 case TLS_ST_SR_CHANGE:
961 return tls_process_change_cipher_spec(s, pkt);
963 case TLS_ST_SR_FINISHED:
964 return tls_process_finished(s, pkt);
969 * Perform any further processing required following the receipt of a message
972 WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst)
974 OSSL_STATEM *st = &s->statem;
976 switch (st->hand_state) {
978 /* Shouldn't happen */
981 case TLS_ST_SR_CLNT_HELLO:
982 return tls_post_process_client_hello(s, wst);
984 case TLS_ST_SR_KEY_EXCH:
985 return tls_post_process_client_key_exchange(s, wst);
987 case TLS_ST_SR_CERT_VRFY:
988 #ifndef OPENSSL_NO_SCTP
989 if ( /* Is this SCTP? */
990 BIO_dgram_is_sctp(SSL_get_wbio(s))
991 /* Are we renegotiating? */
992 && s->renegotiate && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
993 s->s3->in_read_app_data = 2;
994 s->rwstate = SSL_READING;
995 BIO_clear_retry_flags(SSL_get_rbio(s));
996 BIO_set_retry_read(SSL_get_rbio(s));
997 ossl_statem_set_sctp_read_sock(s, 1);
1000 ossl_statem_set_sctp_read_sock(s, 0);
1003 return WORK_FINISHED_CONTINUE;
1005 return WORK_FINISHED_CONTINUE;
1008 #ifndef OPENSSL_NO_SRP
1009 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
1011 int ret = SSL_ERROR_NONE;
1013 *al = SSL_AD_UNRECOGNIZED_NAME;
1015 if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
1016 (s->srp_ctx.TLS_ext_srp_username_callback != NULL)) {
1017 if (s->srp_ctx.login == NULL) {
1019 * RFC 5054 says SHOULD reject, we do so if There is no srp
1022 ret = SSL3_AL_FATAL;
1023 *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
1025 ret = SSL_srp_server_param_with_username(s, al);
1032 int dtls_raw_hello_verify_request(WPACKET *pkt, unsigned char *cookie,
1035 /* Always use DTLS 1.0 version: see RFC 6347 */
1036 if (!WPACKET_put_bytes_u16(pkt, DTLS1_VERSION)
1037 || !WPACKET_sub_memcpy_u8(pkt, cookie, cookie_len))
1043 int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt)
1045 unsigned int cookie_leni;
1046 if (s->ctx->app_gen_cookie_cb == NULL ||
1047 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
1048 &cookie_leni) == 0 ||
1049 cookie_leni > 255) {
1050 SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST,
1051 SSL_R_COOKIE_GEN_CALLBACK_FAILURE);
1054 s->d1->cookie_len = cookie_leni;
1056 if (!dtls_raw_hello_verify_request(pkt, s->d1->cookie,
1057 s->d1->cookie_len)) {
1058 SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST, ERR_R_INTERNAL_ERROR);
1065 MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt)
1067 int i, al = SSL_AD_INTERNAL_ERROR;
1071 const SSL_CIPHER *c;
1072 #ifndef OPENSSL_NO_COMP
1073 SSL_COMP *comp = NULL;
1075 STACK_OF(SSL_CIPHER) *ciphers = NULL;
1077 /* |cookie| will only be initialized for DTLS. */
1078 PACKET session_id, compression, extensions, cookie;
1079 static const unsigned char null_compression = 0;
1080 CLIENTHELLO_MSG clienthello;
1083 * First, parse the raw ClientHello data into the CLIENTHELLO_MSG structure.
1085 memset(&clienthello, 0, sizeof(clienthello));
1086 clienthello.isv2 = RECORD_LAYER_is_sslv2_record(&s->rlayer);
1087 PACKET_null_init(&cookie);
1089 if (clienthello.isv2) {
1093 * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
1094 * header is sent directly on the wire, not wrapped as a TLS
1095 * record. Our record layer just processes the message length and passes
1096 * the rest right through. Its format is:
1098 * 0-1 msg_length - decoded by the record layer
1099 * 2 msg_type - s->init_msg points here
1101 * 5-6 cipher_spec_length
1102 * 7-8 session_id_length
1103 * 9-10 challenge_length
1107 if (!PACKET_get_1(pkt, &mt)
1108 || mt != SSL2_MT_CLIENT_HELLO) {
1110 * Should never happen. We should have tested this in the record
1111 * layer in order to have determined that this is a SSLv2 record
1112 * in the first place
1114 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
1119 if (!PACKET_get_net_2(pkt, &clienthello.legacy_version)) {
1120 al = SSL_AD_DECODE_ERROR;
1121 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
1125 /* Parse the message and load client random. */
1126 if (clienthello.isv2) {
1128 * Handle an SSLv2 backwards compatible ClientHello
1129 * Note, this is only for SSLv3+ using the backward compatible format.
1130 * Real SSLv2 is not supported, and is rejected below.
1132 unsigned int ciphersuite_len, session_id_len, challenge_len;
1135 if (!PACKET_get_net_2(pkt, &ciphersuite_len)
1136 || !PACKET_get_net_2(pkt, &session_id_len)
1137 || !PACKET_get_net_2(pkt, &challenge_len)) {
1138 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1139 SSL_R_RECORD_LENGTH_MISMATCH);
1140 al = SSL_AD_DECODE_ERROR;
1144 if (session_id_len > SSL_MAX_SSL_SESSION_ID_LENGTH) {
1145 al = SSL_AD_DECODE_ERROR;
1146 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1150 if (!PACKET_get_sub_packet(pkt, &clienthello.ciphersuites,
1152 || !PACKET_copy_bytes(pkt, clienthello.session_id, session_id_len)
1153 || !PACKET_get_sub_packet(pkt, &challenge, challenge_len)
1154 /* No extensions. */
1155 || PACKET_remaining(pkt) != 0) {
1156 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1157 SSL_R_RECORD_LENGTH_MISMATCH);
1158 al = SSL_AD_DECODE_ERROR;
1161 clienthello.session_id_len = session_id_len;
1163 /* Load the client random and compression list. We use SSL3_RANDOM_SIZE
1164 * here rather than sizeof(clienthello.random) because that is the limit
1165 * for SSLv3 and it is fixed. It won't change even if
1166 * sizeof(clienthello.random) does.
1168 challenge_len = challenge_len > SSL3_RANDOM_SIZE
1169 ? SSL3_RANDOM_SIZE : challenge_len;
1170 memset(clienthello.random, 0, SSL3_RANDOM_SIZE);
1171 if (!PACKET_copy_bytes(&challenge,
1172 clienthello.random + SSL3_RANDOM_SIZE -
1173 challenge_len, challenge_len)
1174 /* Advertise only null compression. */
1175 || !PACKET_buf_init(&compression, &null_compression, 1)) {
1176 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
1177 al = SSL_AD_INTERNAL_ERROR;
1181 PACKET_null_init(&clienthello.extensions);
1183 /* Regular ClientHello. */
1184 if (!PACKET_copy_bytes(pkt, clienthello.random, SSL3_RANDOM_SIZE)
1185 || !PACKET_get_length_prefixed_1(pkt, &session_id)
1186 || !PACKET_copy_all(&session_id, clienthello.session_id,
1187 SSL_MAX_SSL_SESSION_ID_LENGTH,
1188 &clienthello.session_id_len)) {
1189 al = SSL_AD_DECODE_ERROR;
1190 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1194 if (SSL_IS_DTLS(s)) {
1195 if (!PACKET_get_length_prefixed_1(pkt, &cookie)) {
1196 al = SSL_AD_DECODE_ERROR;
1197 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1200 if (!PACKET_copy_all(&cookie, clienthello.dtls_cookie,
1201 DTLS1_COOKIE_LENGTH,
1202 &clienthello.dtls_cookie_len)) {
1203 al = SSL_AD_DECODE_ERROR;
1204 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1208 * If we require cookies and this ClientHello doesn't contain one,
1209 * just return since we do not want to allocate any memory yet.
1210 * So check cookie length...
1212 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
1213 if (clienthello.dtls_cookie_len == 0)
1218 if (!PACKET_get_length_prefixed_2(pkt, &clienthello.ciphersuites)) {
1219 al = SSL_AD_DECODE_ERROR;
1220 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1224 if (!PACKET_get_length_prefixed_1(pkt, &compression)) {
1225 al = SSL_AD_DECODE_ERROR;
1226 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1230 /* Could be empty. */
1231 if (PACKET_remaining(pkt) == 0) {
1232 PACKET_null_init(&clienthello.extensions);
1234 if (!PACKET_get_length_prefixed_2(pkt, &clienthello.extensions)) {
1235 al = SSL_AD_DECODE_ERROR;
1236 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1242 if (!PACKET_copy_all(&compression, clienthello.compressions,
1243 MAX_COMPRESSIONS_SIZE,
1244 &clienthello.compressions_len)) {
1245 al = SSL_AD_DECODE_ERROR;
1246 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1250 /* Preserve the raw extensions PACKET for later use */
1251 extensions = clienthello.extensions;
1252 if (!tls_collect_extensions(s, &extensions, EXT_CLIENT_HELLO,
1253 &clienthello.pre_proc_exts,
1254 &clienthello.num_extensions, &al)) {
1255 /* SSLerr already been called */
1259 /* Finished parsing the ClientHello, now we can start processing it */
1261 /* Set up the client_random */
1262 memcpy(s->s3->client_random, clienthello.random, SSL3_RANDOM_SIZE);
1264 /* Choose the version */
1266 if (clienthello.isv2) {
1267 if (clienthello.legacy_version == SSL2_VERSION
1268 || (clienthello.legacy_version & 0xff00)
1269 != (SSL3_VERSION_MAJOR << 8)) {
1271 * This is real SSLv2 or something complete unknown. We don't
1274 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
1278 s->client_version = clienthello.legacy_version;
1281 * Do SSL/TLS version negotiation if applicable. For DTLS we just check
1282 * versions are potentially compatible. Version negotiation comes later.
1284 if (!SSL_IS_DTLS(s)) {
1285 protverr = ssl_choose_server_version(s, &clienthello);
1286 } else if (s->method->version != DTLS_ANY_VERSION &&
1287 DTLS_VERSION_LT((int)clienthello.legacy_version, s->version)) {
1288 protverr = SSL_R_VERSION_TOO_LOW;
1294 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr);
1295 if ((!s->enc_write_ctx && !s->write_hash)) {
1296 /* like ssl3_get_record, send alert using remote version number */
1297 s->version = s->client_version = clienthello.legacy_version;
1299 al = SSL_AD_PROTOCOL_VERSION;
1303 if (SSL_IS_DTLS(s)) {
1304 /* Empty cookie was already handled above by returning early. */
1305 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
1306 if (s->ctx->app_verify_cookie_cb != NULL) {
1307 if (s->ctx->app_verify_cookie_cb(s, clienthello.dtls_cookie,
1308 clienthello.dtls_cookie_len) == 0) {
1309 al = SSL_AD_HANDSHAKE_FAILURE;
1310 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1311 SSL_R_COOKIE_MISMATCH);
1313 /* else cookie verification succeeded */
1315 /* default verification */
1316 } else if (s->d1->cookie_len != clienthello.dtls_cookie_len
1317 || memcmp(clienthello.dtls_cookie, s->d1->cookie,
1318 s->d1->cookie_len) != 0) {
1319 al = SSL_AD_HANDSHAKE_FAILURE;
1320 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1323 s->d1->cookie_verified = 1;
1325 if (s->method->version == DTLS_ANY_VERSION) {
1326 protverr = ssl_choose_server_version(s, &clienthello);
1327 if (protverr != 0) {
1328 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr);
1329 s->version = s->client_version;
1330 al = SSL_AD_PROTOCOL_VERSION;
1338 /* We need to do this before getting the session */
1339 if (!tls_check_client_ems_support(s, &clienthello)) {
1340 /* Only fails if the extension is malformed */
1341 al = SSL_AD_DECODE_ERROR;
1342 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1347 * We don't allow resumption in a backwards compatible ClientHello.
1348 * TODO(openssl-team): in TLS1.1+, session_id MUST be empty.
1350 * Versions before 0.9.7 always allow clients to resume sessions in
1351 * renegotiation. 0.9.7 and later allow this by default, but optionally
1352 * ignore resumption requests with flag
1353 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1354 * than a change to default behavior so that applications relying on
1355 * this for security won't even compile against older library versions).
1356 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to
1357 * request renegotiation but not a new session (s->new_session remains
1358 * unset): for servers, this essentially just means that the
1359 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be
1362 if (clienthello.isv2 ||
1364 (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) {
1365 if (!ssl_get_new_session(s, 1))
1368 i = ssl_get_prev_session(s, &clienthello);
1370 * Only resume if the session's version matches the negotiated
1372 * RFC 5246 does not provide much useful advice on resumption
1373 * with a different protocol version. It doesn't forbid it but
1374 * the sanity of such behaviour would be questionable.
1375 * In practice, clients do not accept a version mismatch and
1376 * will abort the handshake with an error.
1378 if (i == 1 && s->version == s->session->ssl_version) {
1379 /* previous session */
1381 } else if (i == -1) {
1385 if (!ssl_get_new_session(s, 1))
1390 if (ssl_bytes_to_cipher_list(s, &clienthello.ciphersuites, &ciphers,
1391 clienthello.isv2, &al) == NULL) {
1395 /* If it is a hit, check that the cipher is in the list */
1398 id = s->session->cipher->id;
1401 fprintf(stderr, "client sent %d ciphers\n", sk_SSL_CIPHER_num(ciphers));
1403 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
1404 c = sk_SSL_CIPHER_value(ciphers, i);
1406 fprintf(stderr, "client [%2d of %2d]:%s\n",
1407 i, sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c));
1416 * we need to have the cipher in the cipher list if we are asked
1419 al = SSL_AD_ILLEGAL_PARAMETER;
1420 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1421 SSL_R_REQUIRED_CIPHER_MISSING);
1426 for (loop = 0; loop < clienthello.compressions_len; loop++) {
1427 if (clienthello.compressions[loop] == 0)
1431 if (loop >= clienthello.compressions_len) {
1433 al = SSL_AD_DECODE_ERROR;
1434 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_COMPRESSION_SPECIFIED);
1438 /* TLS extensions */
1439 if (!ssl_parse_clienthello_tlsext(s, &clienthello)) {
1440 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_PARSE_TLSEXT);
1444 /* Check we've got a key_share for TLSv1.3 */
1445 if (SSL_IS_TLS13(s) && s->s3->peer_tmp == NULL && !s->hit) {
1446 /* No suitable share */
1447 /* TODO(TLS1.3): Send a HelloRetryRequest */
1448 al = SSL_AD_HANDSHAKE_FAILURE;
1449 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_SUITABLE_KEY_SHARE);
1454 * Check if we want to use external pre-shared secret for this handshake
1455 * for not reused session only. We need to generate server_random before
1456 * calling tls_session_secret_cb in order to allow SessionTicket
1457 * processing to use it in key derivation.
1461 pos = s->s3->server_random;
1462 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0) {
1467 if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb) {
1468 const SSL_CIPHER *pref_cipher = NULL;
1470 * s->session->master_key_length is a size_t, but this is an int for
1471 * backwards compat reasons
1473 int master_key_length;
1475 master_key_length = sizeof(s->session->master_key);
1476 if (s->tls_session_secret_cb(s, s->session->master_key,
1477 &master_key_length, ciphers,
1479 s->tls_session_secret_cb_arg)
1480 && master_key_length > 0) {
1481 s->session->master_key_length = master_key_length;
1483 s->session->ciphers = ciphers;
1484 s->session->verify_result = X509_V_OK;
1488 /* check if some cipher was preferred by call back */
1490 pref_cipher ? pref_cipher : ssl3_choose_cipher(s,
1495 if (pref_cipher == NULL) {
1496 al = SSL_AD_HANDSHAKE_FAILURE;
1497 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER);
1501 s->session->cipher = pref_cipher;
1502 sk_SSL_CIPHER_free(s->cipher_list);
1503 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1504 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1505 s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1510 * Worst case, we will use the NULL compression, but if we have other
1511 * options, we will now look for them. We have complen-1 compression
1512 * algorithms from the client, starting at q.
1514 s->s3->tmp.new_compression = NULL;
1515 #ifndef OPENSSL_NO_COMP
1516 /* This only happens if we have a cache hit */
1517 if (s->session->compress_meth != 0) {
1518 int m, comp_id = s->session->compress_meth;
1520 /* Perform sanity checks on resumed compression algorithm */
1521 /* Can't disable compression */
1522 if (!ssl_allow_compression(s)) {
1523 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1524 SSL_R_INCONSISTENT_COMPRESSION);
1527 /* Look for resumed compression method */
1528 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) {
1529 comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
1530 if (comp_id == comp->id) {
1531 s->s3->tmp.new_compression = comp;
1535 if (s->s3->tmp.new_compression == NULL) {
1536 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1537 SSL_R_INVALID_COMPRESSION_ALGORITHM);
1540 /* Look for resumed method in compression list */
1541 for (k = 0; k < clienthello.compressions_len; k++) {
1542 if (clienthello.compressions[k] == comp_id)
1545 if (k >= clienthello.compressions_len) {
1546 al = SSL_AD_ILLEGAL_PARAMETER;
1547 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1548 SSL_R_REQUIRED_COMPRESSION_ALGORITHM_MISSING);
1553 else if (ssl_allow_compression(s) && s->ctx->comp_methods) {
1554 /* See if we have a match */
1555 int m, nn, v, done = 0;
1558 nn = sk_SSL_COMP_num(s->ctx->comp_methods);
1559 for (m = 0; m < nn; m++) {
1560 comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
1562 for (o = 0; o < clienthello.compressions_len; o++) {
1563 if (v == clienthello.compressions[o]) {
1572 s->s3->tmp.new_compression = comp;
1578 * If compression is disabled we'd better not try to resume a session
1579 * using compression.
1581 if (s->session->compress_meth != 0) {
1582 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_INCONSISTENT_COMPRESSION);
1588 * Given s->session->ciphers and SSL_get_ciphers, we must pick a cipher
1592 #ifdef OPENSSL_NO_COMP
1593 s->session->compress_meth = 0;
1595 s->session->compress_meth = (comp == NULL) ? 0 : comp->id;
1597 sk_SSL_CIPHER_free(s->session->ciphers);
1598 s->session->ciphers = ciphers;
1599 if (ciphers == NULL) {
1600 al = SSL_AD_INTERNAL_ERROR;
1601 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
1605 if (!tls1_set_server_sigalgs(s)) {
1606 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1611 sk_SSL_CIPHER_free(ciphers);
1612 OPENSSL_free(clienthello.pre_proc_exts);
1613 return MSG_PROCESS_CONTINUE_PROCESSING;
1615 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1617 ossl_statem_set_error(s);
1619 sk_SSL_CIPHER_free(ciphers);
1620 OPENSSL_free(clienthello.pre_proc_exts);
1622 return MSG_PROCESS_ERROR;
1625 WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst)
1627 int al = SSL_AD_HANDSHAKE_FAILURE;
1628 const SSL_CIPHER *cipher;
1630 if (wst == WORK_MORE_A) {
1632 /* Let cert callback update server certificates if required */
1633 if (s->cert->cert_cb) {
1634 int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
1636 al = SSL_AD_INTERNAL_ERROR;
1637 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1638 SSL_R_CERT_CB_ERROR);
1642 s->rwstate = SSL_X509_LOOKUP;
1645 s->rwstate = SSL_NOTHING;
1648 ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1650 if (cipher == NULL) {
1651 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1652 SSL_R_NO_SHARED_CIPHER);
1655 s->s3->tmp.new_cipher = cipher;
1656 /* check whether we should disable session resumption */
1657 if (s->not_resumable_session_cb != NULL)
1658 s->session->not_resumable = s->not_resumable_session_cb(s,
1659 ((cipher->algorithm_mkey & (SSL_kDHE | SSL_kECDHE)) != 0));
1660 if (s->session->not_resumable)
1661 /* do not send a session ticket */
1662 s->tlsext_ticket_expected = 0;
1664 /* Session-id reuse */
1665 s->s3->tmp.new_cipher = s->session->cipher;
1668 if (!(s->verify_mode & SSL_VERIFY_PEER)) {
1669 if (!ssl3_digest_cached_records(s, 0)) {
1670 al = SSL_AD_INTERNAL_ERROR;
1676 * we now have the following setup.
1678 * cipher_list - our preferred list of ciphers
1679 * ciphers - the clients preferred list of ciphers
1680 * compression - basically ignored right now
1681 * ssl version is set - sslv3
1682 * s->session - The ssl session has been setup.
1683 * s->hit - session reuse flag
1684 * s->s3->tmp.new_cipher- the new cipher to use.
1687 /* Handles TLS extensions that we couldn't check earlier */
1688 if (s->version >= SSL3_VERSION) {
1689 if (!ssl_check_clienthello_tlsext_late(s, &al)) {
1690 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1691 SSL_R_CLIENTHELLO_TLSEXT);
1698 #ifndef OPENSSL_NO_SRP
1699 if (wst == WORK_MORE_B) {
1701 if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) {
1703 * callback indicates further work to be done
1705 s->rwstate = SSL_X509_LOOKUP;
1708 if (ret != SSL_ERROR_NONE) {
1710 * This is not really an error but the only means to for
1711 * a client to detect whether srp is supported.
1713 if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
1714 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1715 SSL_R_CLIENTHELLO_TLSEXT);
1717 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1718 SSL_R_PSK_IDENTITY_NOT_FOUND);
1725 return WORK_FINISHED_STOP;
1727 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1728 ossl_statem_set_error(s);
1732 int tls_construct_server_hello(SSL *s, WPACKET *pkt)
1734 int compm, al = SSL_AD_INTERNAL_ERROR;
1738 /* TODO(TLS1.3): Remove the DRAFT conditional before release */
1739 version = SSL_IS_TLS13(s) ? TLS1_3_VERSION_DRAFT : s->version;
1740 if (!WPACKET_put_bytes_u16(pkt, version)
1742 * Random stuff. Filling of the server_random takes place in
1743 * tls_process_client_hello()
1745 || !WPACKET_memcpy(pkt, s->s3->server_random, SSL3_RANDOM_SIZE)) {
1746 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1751 * There are several cases for the session ID to send
1752 * back in the server hello:
1753 * - For session reuse from the session cache,
1754 * we send back the old session ID.
1755 * - If stateless session reuse (using a session ticket)
1756 * is successful, we send back the client's "session ID"
1757 * (which doesn't actually identify the session).
1758 * - If it is a new session, we send back the new
1760 * - However, if we want the new session to be single-use,
1761 * we send back a 0-length session ID.
1762 * s->hit is non-zero in either case of session reuse,
1763 * so the following won't overwrite an ID that we're supposed
1766 if (s->session->not_resumable ||
1767 (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1769 s->session->session_id_length = 0;
1771 sl = s->session->session_id_length;
1772 if (sl > sizeof(s->session->session_id)) {
1773 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1777 /* set up the compression method */
1778 #ifdef OPENSSL_NO_COMP
1781 if (s->s3->tmp.new_compression == NULL)
1784 compm = s->s3->tmp.new_compression->id;
1787 if ((!SSL_IS_TLS13(s)
1788 && !WPACKET_sub_memcpy_u8(pkt, s->session->session_id, sl))
1789 || !s->method->put_cipher_by_char(s->s3->tmp.new_cipher, pkt, &len)
1790 || (!SSL_IS_TLS13(s)
1791 && !WPACKET_put_bytes_u8(pkt, compm))
1792 || !ssl_prepare_serverhello_tlsext(s)
1793 || !ssl_add_serverhello_tlsext(s, pkt, &al)) {
1794 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1800 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
1804 int tls_construct_server_done(SSL *s, WPACKET *pkt)
1806 if (!s->s3->tmp.cert_request) {
1807 if (!ssl3_digest_cached_records(s, 0)) {
1808 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
1815 int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt)
1817 #ifndef OPENSSL_NO_DH
1818 EVP_PKEY *pkdh = NULL;
1820 #ifndef OPENSSL_NO_EC
1821 unsigned char *encodedPoint = NULL;
1822 size_t encodedlen = 0;
1826 const EVP_MD *md = NULL;
1827 int al = SSL_AD_INTERNAL_ERROR, i;
1830 EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
1831 size_t paramlen, paramoffset;
1833 if (!WPACKET_get_total_written(pkt, ¶moffset)) {
1834 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1838 if (md_ctx == NULL) {
1839 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1843 type = s->s3->tmp.new_cipher->algorithm_mkey;
1845 r[0] = r[1] = r[2] = r[3] = NULL;
1846 #ifndef OPENSSL_NO_PSK
1847 /* Plain PSK or RSAPSK nothing to do */
1848 if (type & (SSL_kPSK | SSL_kRSAPSK)) {
1850 #endif /* !OPENSSL_NO_PSK */
1851 #ifndef OPENSSL_NO_DH
1852 if (type & (SSL_kDHE | SSL_kDHEPSK)) {
1853 CERT *cert = s->cert;
1855 EVP_PKEY *pkdhp = NULL;
1858 if (s->cert->dh_tmp_auto) {
1859 DH *dhp = ssl_get_auto_dh(s);
1860 pkdh = EVP_PKEY_new();
1861 if (pkdh == NULL || dhp == NULL) {
1863 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1864 ERR_R_INTERNAL_ERROR);
1867 EVP_PKEY_assign_DH(pkdh, dhp);
1870 pkdhp = cert->dh_tmp;
1872 if ((pkdhp == NULL) && (s->cert->dh_tmp_cb != NULL)) {
1873 DH *dhp = s->cert->dh_tmp_cb(s, 0, 1024);
1874 pkdh = ssl_dh_to_pkey(dhp);
1876 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1877 ERR_R_INTERNAL_ERROR);
1882 if (pkdhp == NULL) {
1883 al = SSL_AD_HANDSHAKE_FAILURE;
1884 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1885 SSL_R_MISSING_TMP_DH_KEY);
1888 if (!ssl_security(s, SSL_SECOP_TMP_DH,
1889 EVP_PKEY_security_bits(pkdhp), 0, pkdhp)) {
1890 al = SSL_AD_HANDSHAKE_FAILURE;
1891 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1892 SSL_R_DH_KEY_TOO_SMALL);
1895 if (s->s3->tmp.pkey != NULL) {
1896 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1897 ERR_R_INTERNAL_ERROR);
1901 s->s3->tmp.pkey = ssl_generate_pkey(pkdhp);
1903 if (s->s3->tmp.pkey == NULL) {
1904 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB);
1908 dh = EVP_PKEY_get0_DH(s->s3->tmp.pkey);
1910 EVP_PKEY_free(pkdh);
1913 DH_get0_pqg(dh, &r[0], NULL, &r[1]);
1914 DH_get0_key(dh, &r[2], NULL);
1917 #ifndef OPENSSL_NO_EC
1918 if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
1921 if (s->s3->tmp.pkey != NULL) {
1922 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1923 ERR_R_INTERNAL_ERROR);
1927 /* Get NID of appropriate shared curve */
1928 nid = tls1_shared_group(s, -2);
1929 curve_id = tls1_ec_nid2curve_id(nid);
1930 if (curve_id == 0) {
1931 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1932 SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1935 s->s3->tmp.pkey = ssl_generate_pkey_curve(curve_id);
1936 /* Generate a new key for this curve */
1937 if (s->s3->tmp.pkey == NULL) {
1938 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB);
1942 /* Encode the public key. */
1943 encodedlen = EVP_PKEY_get1_tls_encodedpoint(s->s3->tmp.pkey,
1945 if (encodedlen == 0) {
1946 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EC_LIB);
1951 * We'll generate the serverKeyExchange message explicitly so we
1952 * can set these to NULLs
1959 #endif /* !OPENSSL_NO_EC */
1960 #ifndef OPENSSL_NO_SRP
1961 if (type & SSL_kSRP) {
1962 if ((s->srp_ctx.N == NULL) ||
1963 (s->srp_ctx.g == NULL) ||
1964 (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) {
1965 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1966 SSL_R_MISSING_SRP_PARAM);
1969 r[0] = s->srp_ctx.N;
1970 r[1] = s->srp_ctx.g;
1971 r[2] = s->srp_ctx.s;
1972 r[3] = s->srp_ctx.B;
1976 al = SSL_AD_HANDSHAKE_FAILURE;
1977 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1978 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1982 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP))
1983 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) {
1984 if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, &md))
1986 al = SSL_AD_DECODE_ERROR;
1993 #ifndef OPENSSL_NO_PSK
1994 if (type & SSL_PSK) {
1995 size_t len = (s->cert->psk_identity_hint == NULL)
1996 ? 0 : strlen(s->cert->psk_identity_hint);
1999 * It should not happen that len > PSK_MAX_IDENTITY_LEN - we already
2000 * checked this when we set the identity hint - but just in case
2002 if (len > PSK_MAX_IDENTITY_LEN
2003 || !WPACKET_sub_memcpy_u16(pkt, s->cert->psk_identity_hint,
2005 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2006 ERR_R_INTERNAL_ERROR);
2012 for (i = 0; i < 4 && r[i] != NULL; i++) {
2013 unsigned char *binval;
2016 #ifndef OPENSSL_NO_SRP
2017 if ((i == 2) && (type & SSL_kSRP)) {
2018 res = WPACKET_start_sub_packet_u8(pkt);
2021 res = WPACKET_start_sub_packet_u16(pkt);
2024 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2025 ERR_R_INTERNAL_ERROR);
2029 #ifndef OPENSSL_NO_DH
2031 * for interoperability with some versions of the Microsoft TLS
2032 * stack, we need to zero pad the DHE pub key to the same length
2035 if ((i == 2) && (type & (SSL_kDHE | SSL_kDHEPSK))) {
2036 size_t len = BN_num_bytes(r[0]) - BN_num_bytes(r[2]);
2039 if (!WPACKET_allocate_bytes(pkt, len, &binval)) {
2040 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2041 ERR_R_INTERNAL_ERROR);
2044 memset(binval, 0, len);
2048 if (!WPACKET_allocate_bytes(pkt, BN_num_bytes(r[i]), &binval)
2049 || !WPACKET_close(pkt)) {
2050 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2051 ERR_R_INTERNAL_ERROR);
2055 BN_bn2bin(r[i], binval);
2058 #ifndef OPENSSL_NO_EC
2059 if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
2061 * We only support named (not generic) curves. In this situation, the
2062 * ServerKeyExchange message has: [1 byte CurveType], [2 byte CurveName]
2063 * [1 byte length of encoded point], followed by the actual encoded
2066 if (!WPACKET_put_bytes_u8(pkt, NAMED_CURVE_TYPE)
2067 || !WPACKET_put_bytes_u8(pkt, 0)
2068 || !WPACKET_put_bytes_u8(pkt, curve_id)
2069 || !WPACKET_sub_memcpy_u8(pkt, encodedPoint, encodedlen)) {
2070 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2071 ERR_R_INTERNAL_ERROR);
2074 OPENSSL_free(encodedPoint);
2075 encodedPoint = NULL;
2082 * n is the length of the params, they start at &(d[4]) and p
2083 * points to the space at the end.
2086 unsigned char *sigbytes1, *sigbytes2;
2087 unsigned int siglen;
2089 /* Get length of the parameters we have written above */
2090 if (!WPACKET_get_length(pkt, ¶mlen)) {
2091 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2092 ERR_R_INTERNAL_ERROR);
2095 /* send signature algorithm */
2096 if (SSL_USE_SIGALGS(s)) {
2097 if (!tls12_get_sigandhash(pkt, pkey, md)) {
2098 /* Should never happen */
2099 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2100 ERR_R_INTERNAL_ERROR);
2105 fprintf(stderr, "Using hash %s\n", EVP_MD_name(md));
2108 * Create the signature. We don't know the actual length of the sig
2109 * until after we've created it, so we reserve enough bytes for it
2110 * up front, and then properly allocate them in the WPACKET
2113 if (!WPACKET_sub_reserve_bytes_u16(pkt, EVP_PKEY_size(pkey),
2115 || EVP_SignInit_ex(md_ctx, md, NULL) <= 0
2116 || EVP_SignUpdate(md_ctx, &(s->s3->client_random[0]),
2117 SSL3_RANDOM_SIZE) <= 0
2118 || EVP_SignUpdate(md_ctx, &(s->s3->server_random[0]),
2119 SSL3_RANDOM_SIZE) <= 0
2120 || EVP_SignUpdate(md_ctx, s->init_buf->data + paramoffset,
2122 || EVP_SignFinal(md_ctx, sigbytes1, &siglen, pkey) <= 0
2123 || !WPACKET_sub_allocate_bytes_u16(pkt, siglen, &sigbytes2)
2124 || sigbytes1 != sigbytes2) {
2125 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2126 ERR_R_INTERNAL_ERROR);
2130 /* Is this error check actually needed? */
2131 al = SSL_AD_HANDSHAKE_FAILURE;
2132 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2133 SSL_R_UNKNOWN_PKEY_TYPE);
2138 EVP_MD_CTX_free(md_ctx);
2141 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2143 #ifndef OPENSSL_NO_DH
2144 EVP_PKEY_free(pkdh);
2146 #ifndef OPENSSL_NO_EC
2147 OPENSSL_free(encodedPoint);
2149 EVP_MD_CTX_free(md_ctx);
2153 int tls_construct_certificate_request(SSL *s, WPACKET *pkt)
2156 STACK_OF(X509_NAME) *sk = NULL;
2158 /* get the list of acceptable cert types */
2159 if (!WPACKET_start_sub_packet_u8(pkt)
2160 || !ssl3_get_req_cert_type(s, pkt)
2161 || !WPACKET_close(pkt)) {
2162 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);
2166 if (SSL_USE_SIGALGS(s)) {
2167 const unsigned char *psigs;
2168 size_t nl = tls12_get_psigalgs(s, &psigs);
2169 if (!WPACKET_start_sub_packet_u16(pkt)
2170 || !tls12_copy_sigalgs(s, pkt, psigs, nl)
2171 || !WPACKET_close(pkt)) {
2172 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,
2173 ERR_R_INTERNAL_ERROR);
2178 /* Start sub-packet for client CA list */
2179 if (!WPACKET_start_sub_packet_u16(pkt)) {
2180 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);
2184 sk = SSL_get_client_CA_list(s);
2186 for (i = 0; i < sk_X509_NAME_num(sk); i++) {
2187 unsigned char *namebytes;
2188 X509_NAME *name = sk_X509_NAME_value(sk, i);
2192 || (namelen = i2d_X509_NAME(name, NULL)) < 0
2193 || !WPACKET_sub_allocate_bytes_u16(pkt, namelen,
2195 || i2d_X509_NAME(name, &namebytes) != namelen) {
2196 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,
2197 ERR_R_INTERNAL_ERROR);
2202 /* else no CA names */
2204 if (!WPACKET_close(pkt)) {
2205 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);
2209 s->s3->tmp.cert_request = 1;
2213 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2217 static int tls_process_cke_psk_preamble(SSL *s, PACKET *pkt, int *al)
2219 #ifndef OPENSSL_NO_PSK
2220 unsigned char psk[PSK_MAX_PSK_LEN];
2222 PACKET psk_identity;
2224 if (!PACKET_get_length_prefixed_2(pkt, &psk_identity)) {
2225 *al = SSL_AD_DECODE_ERROR;
2226 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_LENGTH_MISMATCH);
2229 if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) {
2230 *al = SSL_AD_DECODE_ERROR;
2231 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_DATA_LENGTH_TOO_LONG);
2234 if (s->psk_server_callback == NULL) {
2235 *al = SSL_AD_INTERNAL_ERROR;
2236 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_PSK_NO_SERVER_CB);
2240 if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) {
2241 *al = SSL_AD_INTERNAL_ERROR;
2242 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
2246 psklen = s->psk_server_callback(s, s->session->psk_identity,
2249 if (psklen > PSK_MAX_PSK_LEN) {
2250 *al = SSL_AD_INTERNAL_ERROR;
2251 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
2253 } else if (psklen == 0) {
2255 * PSK related to the given identity not found
2257 *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
2258 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
2259 SSL_R_PSK_IDENTITY_NOT_FOUND);
2263 OPENSSL_free(s->s3->tmp.psk);
2264 s->s3->tmp.psk = OPENSSL_memdup(psk, psklen);
2265 OPENSSL_cleanse(psk, psklen);
2267 if (s->s3->tmp.psk == NULL) {
2268 *al = SSL_AD_INTERNAL_ERROR;
2269 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_MALLOC_FAILURE);
2273 s->s3->tmp.psklen = psklen;
2277 /* Should never happen */
2278 *al = SSL_AD_INTERNAL_ERROR;
2279 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
2284 static int tls_process_cke_rsa(SSL *s, PACKET *pkt, int *al)
2286 #ifndef OPENSSL_NO_RSA
2287 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2289 unsigned char decrypt_good, version_good;
2290 size_t j, padding_len;
2291 PACKET enc_premaster;
2293 unsigned char *rsa_decrypt = NULL;
2296 rsa = EVP_PKEY_get0_RSA(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey);
2298 *al = SSL_AD_HANDSHAKE_FAILURE;
2299 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_MISSING_RSA_CERTIFICATE);
2303 /* SSLv3 and pre-standard DTLS omit the length bytes. */
2304 if (s->version == SSL3_VERSION || s->version == DTLS1_BAD_VER) {
2305 enc_premaster = *pkt;
2307 if (!PACKET_get_length_prefixed_2(pkt, &enc_premaster)
2308 || PACKET_remaining(pkt) != 0) {
2309 *al = SSL_AD_DECODE_ERROR;
2310 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_LENGTH_MISMATCH);
2316 * We want to be sure that the plaintext buffer size makes it safe to
2317 * iterate over the entire size of a premaster secret
2318 * (SSL_MAX_MASTER_KEY_LENGTH). Reject overly short RSA keys because
2319 * their ciphertext cannot accommodate a premaster secret anyway.
2321 if (RSA_size(rsa) < SSL_MAX_MASTER_KEY_LENGTH) {
2322 *al = SSL_AD_INTERNAL_ERROR;
2323 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, RSA_R_KEY_SIZE_TOO_SMALL);
2327 rsa_decrypt = OPENSSL_malloc(RSA_size(rsa));
2328 if (rsa_decrypt == NULL) {
2329 *al = SSL_AD_INTERNAL_ERROR;
2330 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_MALLOC_FAILURE);
2335 * We must not leak whether a decryption failure occurs because of
2336 * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246,
2337 * section 7.4.7.1). The code follows that advice of the TLS RFC and
2338 * generates a random premaster secret for the case that the decrypt
2339 * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1
2342 if (RAND_bytes(rand_premaster_secret, sizeof(rand_premaster_secret)) <= 0)
2346 * Decrypt with no padding. PKCS#1 padding will be removed as part of
2347 * the timing-sensitive code below.
2349 /* TODO(size_t): Convert this function */
2350 decrypt_len = (int)RSA_private_decrypt((int)PACKET_remaining(&enc_premaster),
2351 PACKET_data(&enc_premaster),
2352 rsa_decrypt, rsa, RSA_NO_PADDING);
2353 if (decrypt_len < 0)
2356 /* Check the padding. See RFC 3447, section 7.2.2. */
2359 * The smallest padded premaster is 11 bytes of overhead. Small keys
2360 * are publicly invalid, so this may return immediately. This ensures
2361 * PS is at least 8 bytes.
2363 if (decrypt_len < 11 + SSL_MAX_MASTER_KEY_LENGTH) {
2364 *al = SSL_AD_DECRYPT_ERROR;
2365 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_DECRYPTION_FAILED);
2369 padding_len = decrypt_len - SSL_MAX_MASTER_KEY_LENGTH;
2370 decrypt_good = constant_time_eq_int_8(rsa_decrypt[0], 0) &
2371 constant_time_eq_int_8(rsa_decrypt[1], 2);
2372 for (j = 2; j < padding_len - 1; j++) {
2373 decrypt_good &= ~constant_time_is_zero_8(rsa_decrypt[j]);
2375 decrypt_good &= constant_time_is_zero_8(rsa_decrypt[padding_len - 1]);
2378 * If the version in the decrypted pre-master secret is correct then
2379 * version_good will be 0xff, otherwise it'll be zero. The
2380 * Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2381 * (http://eprint.iacr.org/2003/052/) exploits the version number
2382 * check as a "bad version oracle". Thus version checks are done in
2383 * constant time and are treated like any other decryption error.
2386 constant_time_eq_8(rsa_decrypt[padding_len],
2387 (unsigned)(s->client_version >> 8));
2389 constant_time_eq_8(rsa_decrypt[padding_len + 1],
2390 (unsigned)(s->client_version & 0xff));
2393 * The premaster secret must contain the same version number as the
2394 * ClientHello to detect version rollback attacks (strangely, the
2395 * protocol does not offer such protection for DH ciphersuites).
2396 * However, buggy clients exist that send the negotiated protocol
2397 * version instead if the server does not support the requested
2398 * protocol version. If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such
2401 if (s->options & SSL_OP_TLS_ROLLBACK_BUG) {
2402 unsigned char workaround_good;
2403 workaround_good = constant_time_eq_8(rsa_decrypt[padding_len],
2404 (unsigned)(s->version >> 8));
2406 constant_time_eq_8(rsa_decrypt[padding_len + 1],
2407 (unsigned)(s->version & 0xff));
2408 version_good |= workaround_good;
2412 * Both decryption and version must be good for decrypt_good to
2413 * remain non-zero (0xff).
2415 decrypt_good &= version_good;
2418 * Now copy rand_premaster_secret over from p using
2419 * decrypt_good_mask. If decryption failed, then p does not
2420 * contain valid plaintext, however, a check above guarantees
2421 * it is still sufficiently large to read from.
2423 for (j = 0; j < sizeof(rand_premaster_secret); j++) {
2424 rsa_decrypt[padding_len + j] =
2425 constant_time_select_8(decrypt_good,
2426 rsa_decrypt[padding_len + j],
2427 rand_premaster_secret[j]);
2430 if (!ssl_generate_master_secret(s, rsa_decrypt + padding_len,
2431 sizeof(rand_premaster_secret), 0)) {
2432 *al = SSL_AD_INTERNAL_ERROR;
2433 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_INTERNAL_ERROR);
2439 OPENSSL_free(rsa_decrypt);
2442 /* Should never happen */
2443 *al = SSL_AD_INTERNAL_ERROR;
2444 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_INTERNAL_ERROR);
2449 static int tls_process_cke_dhe(SSL *s, PACKET *pkt, int *al)
2451 #ifndef OPENSSL_NO_DH
2452 EVP_PKEY *skey = NULL;
2456 const unsigned char *data;
2457 EVP_PKEY *ckey = NULL;
2460 if (!PACKET_get_net_2(pkt, &i) || PACKET_remaining(pkt) != i) {
2461 *al = SSL_AD_HANDSHAKE_FAILURE;
2462 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE,
2463 SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2466 skey = s->s3->tmp.pkey;
2468 *al = SSL_AD_HANDSHAKE_FAILURE;
2469 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_MISSING_TMP_DH_KEY);
2473 if (PACKET_remaining(pkt) == 0L) {
2474 *al = SSL_AD_HANDSHAKE_FAILURE;
2475 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_MISSING_TMP_DH_KEY);
2478 if (!PACKET_get_bytes(pkt, &data, i)) {
2479 /* We already checked we have enough data */
2480 *al = SSL_AD_INTERNAL_ERROR;
2481 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
2484 ckey = EVP_PKEY_new();
2485 if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) == 0) {
2486 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_BN_LIB);
2489 cdh = EVP_PKEY_get0_DH(ckey);
2490 pub_key = BN_bin2bn(data, i, NULL);
2492 if (pub_key == NULL || !DH_set0_key(cdh, pub_key, NULL)) {
2493 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
2494 if (pub_key != NULL)
2499 if (ssl_derive(s, skey, ckey, 1) == 0) {
2500 *al = SSL_AD_INTERNAL_ERROR;
2501 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
2506 EVP_PKEY_free(s->s3->tmp.pkey);
2507 s->s3->tmp.pkey = NULL;
2509 EVP_PKEY_free(ckey);
2512 /* Should never happen */
2513 *al = SSL_AD_INTERNAL_ERROR;
2514 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
2519 static int tls_process_cke_ecdhe(SSL *s, PACKET *pkt, int *al)
2521 #ifndef OPENSSL_NO_EC
2522 EVP_PKEY *skey = s->s3->tmp.pkey;
2523 EVP_PKEY *ckey = NULL;
2526 if (PACKET_remaining(pkt) == 0L) {
2527 /* We don't support ECDH client auth */
2528 *al = SSL_AD_HANDSHAKE_FAILURE;
2529 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, SSL_R_MISSING_TMP_ECDH_KEY);
2533 const unsigned char *data;
2536 * Get client's public key from encoded point in the
2537 * ClientKeyExchange message.
2540 /* Get encoded point length */
2541 if (!PACKET_get_1(pkt, &i) || !PACKET_get_bytes(pkt, &data, i)
2542 || PACKET_remaining(pkt) != 0) {
2543 *al = SSL_AD_DECODE_ERROR;
2544 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, SSL_R_LENGTH_MISMATCH);
2547 ckey = EVP_PKEY_new();
2548 if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) <= 0) {
2549 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_EVP_LIB);
2552 if (EVP_PKEY_set1_tls_encodedpoint(ckey, data, i) == 0) {
2553 *al = SSL_AD_HANDSHAKE_FAILURE;
2554 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_EC_LIB);
2559 if (ssl_derive(s, skey, ckey, 1) == 0) {
2560 *al = SSL_AD_INTERNAL_ERROR;
2561 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_INTERNAL_ERROR);
2566 EVP_PKEY_free(s->s3->tmp.pkey);
2567 s->s3->tmp.pkey = NULL;
2569 EVP_PKEY_free(ckey);
2573 /* Should never happen */
2574 *al = SSL_AD_INTERNAL_ERROR;
2575 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_INTERNAL_ERROR);
2580 static int tls_process_cke_srp(SSL *s, PACKET *pkt, int *al)
2582 #ifndef OPENSSL_NO_SRP
2584 const unsigned char *data;
2586 if (!PACKET_get_net_2(pkt, &i)
2587 || !PACKET_get_bytes(pkt, &data, i)) {
2588 *al = SSL_AD_DECODE_ERROR;
2589 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, SSL_R_BAD_SRP_A_LENGTH);
2592 if ((s->srp_ctx.A = BN_bin2bn(data, i, NULL)) == NULL) {
2593 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_BN_LIB);
2596 if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0 || BN_is_zero(s->srp_ctx.A)) {
2597 *al = SSL_AD_ILLEGAL_PARAMETER;
2598 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, SSL_R_BAD_SRP_PARAMETERS);
2601 OPENSSL_free(s->session->srp_username);
2602 s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login);
2603 if (s->session->srp_username == NULL) {
2604 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_MALLOC_FAILURE);
2608 if (!srp_generate_server_master_secret(s)) {
2609 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_INTERNAL_ERROR);
2615 /* Should never happen */
2616 *al = SSL_AD_INTERNAL_ERROR;
2617 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_INTERNAL_ERROR);
2622 static int tls_process_cke_gost(SSL *s, PACKET *pkt, int *al)
2624 #ifndef OPENSSL_NO_GOST
2625 EVP_PKEY_CTX *pkey_ctx;
2626 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2627 unsigned char premaster_secret[32];
2628 const unsigned char *start;
2629 size_t outlen = 32, inlen;
2630 unsigned long alg_a;
2633 size_t sess_key_len;
2634 const unsigned char *data;
2637 /* Get our certificate private key */
2638 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2639 if (alg_a & SSL_aGOST12) {
2641 * New GOST ciphersuites have SSL_aGOST01 bit too
2643 pk = s->cert->pkeys[SSL_PKEY_GOST12_512].privatekey;
2645 pk = s->cert->pkeys[SSL_PKEY_GOST12_256].privatekey;
2648 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2650 } else if (alg_a & SSL_aGOST01) {
2651 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2654 pkey_ctx = EVP_PKEY_CTX_new(pk, NULL);
2655 if (pkey_ctx == NULL) {
2656 *al = SSL_AD_INTERNAL_ERROR;
2657 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_MALLOC_FAILURE);
2660 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) {
2661 *al = SSL_AD_INTERNAL_ERROR;
2662 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
2666 * If client certificate is present and is of the same type, maybe
2667 * use it for key exchange. Don't mind errors from
2668 * EVP_PKEY_derive_set_peer, because it is completely valid to use a
2669 * client certificate for authorization only.
2671 client_pub_pkey = X509_get0_pubkey(s->session->peer);
2672 if (client_pub_pkey) {
2673 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2676 /* Decrypt session key */
2677 sess_key_len = PACKET_remaining(pkt);
2678 if (!PACKET_get_bytes(pkt, &data, sess_key_len)) {
2679 *al = SSL_AD_INTERNAL_ERROR;
2680 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
2683 /* TODO(size_t): Convert this function */
2684 if (ASN1_get_object((const unsigned char **)&data, &Tlen, &Ttag,
2685 &Tclass, (long)sess_key_len) != V_ASN1_CONSTRUCTED
2686 || Ttag != V_ASN1_SEQUENCE || Tclass != V_ASN1_UNIVERSAL) {
2687 *al = SSL_AD_DECODE_ERROR;
2688 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, SSL_R_DECRYPTION_FAILED);
2693 if (EVP_PKEY_decrypt
2694 (pkey_ctx, premaster_secret, &outlen, start, inlen) <= 0) {
2695 *al = SSL_AD_DECODE_ERROR;
2696 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, SSL_R_DECRYPTION_FAILED);
2699 /* Generate master secret */
2700 if (!ssl_generate_master_secret(s, premaster_secret,
2701 sizeof(premaster_secret), 0)) {
2702 *al = SSL_AD_INTERNAL_ERROR;
2703 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
2706 /* Check if pubkey from client certificate was used */
2707 if (EVP_PKEY_CTX_ctrl
2708 (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2709 s->statem.no_cert_verify = 1;
2713 EVP_PKEY_CTX_free(pkey_ctx);
2716 /* Should never happen */
2717 *al = SSL_AD_INTERNAL_ERROR;
2718 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
2723 MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt)
2726 unsigned long alg_k;
2728 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2730 /* For PSK parse and retrieve identity, obtain PSK key */
2731 if ((alg_k & SSL_PSK) && !tls_process_cke_psk_preamble(s, pkt, &al))
2734 if (alg_k & SSL_kPSK) {
2735 /* Identity extracted earlier: should be nothing left */
2736 if (PACKET_remaining(pkt) != 0) {
2737 al = SSL_AD_HANDSHAKE_FAILURE;
2738 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
2739 SSL_R_LENGTH_MISMATCH);
2742 /* PSK handled by ssl_generate_master_secret */
2743 if (!ssl_generate_master_secret(s, NULL, 0, 0)) {
2744 al = SSL_AD_INTERNAL_ERROR;
2745 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2748 } else if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) {
2749 if (!tls_process_cke_rsa(s, pkt, &al))
2751 } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) {
2752 if (!tls_process_cke_dhe(s, pkt, &al))
2754 } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) {
2755 if (!tls_process_cke_ecdhe(s, pkt, &al))
2757 } else if (alg_k & SSL_kSRP) {
2758 if (!tls_process_cke_srp(s, pkt, &al))
2760 } else if (alg_k & SSL_kGOST) {
2761 if (!tls_process_cke_gost(s, pkt, &al))
2764 al = SSL_AD_HANDSHAKE_FAILURE;
2765 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
2766 SSL_R_UNKNOWN_CIPHER_TYPE);
2770 return MSG_PROCESS_CONTINUE_PROCESSING;
2773 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2774 #ifndef OPENSSL_NO_PSK
2775 OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen);
2776 s->s3->tmp.psk = NULL;
2778 ossl_statem_set_error(s);
2779 return MSG_PROCESS_ERROR;
2782 WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst)
2784 #ifndef OPENSSL_NO_SCTP
2785 if (wst == WORK_MORE_A) {
2786 if (SSL_IS_DTLS(s)) {
2787 unsigned char sctpauthkey[64];
2788 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
2790 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
2793 memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
2794 sizeof(DTLS1_SCTP_AUTH_LABEL));
2796 if (SSL_export_keying_material(s, sctpauthkey,
2797 sizeof(sctpauthkey), labelbuffer,
2798 sizeof(labelbuffer), NULL, 0,
2800 ossl_statem_set_error(s);
2804 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
2805 sizeof(sctpauthkey), sctpauthkey);
2810 if ((wst == WORK_MORE_B)
2812 && BIO_dgram_is_sctp(SSL_get_wbio(s))
2813 /* Are we renegotiating? */
2815 /* Are we going to skip the CertificateVerify? */
2816 && (s->session->peer == NULL || s->statem.no_cert_verify)
2817 && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
2818 s->s3->in_read_app_data = 2;
2819 s->rwstate = SSL_READING;
2820 BIO_clear_retry_flags(SSL_get_rbio(s));
2821 BIO_set_retry_read(SSL_get_rbio(s));
2822 ossl_statem_set_sctp_read_sock(s, 1);
2825 ossl_statem_set_sctp_read_sock(s, 0);
2829 if (s->statem.no_cert_verify || !s->session->peer) {
2831 * No certificate verify or no peer certificate so we no longer need
2832 * the handshake_buffer
2834 if (!ssl3_digest_cached_records(s, 0)) {
2835 ossl_statem_set_error(s);
2838 return WORK_FINISHED_CONTINUE;
2840 if (!s->s3->handshake_buffer) {
2841 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE,
2842 ERR_R_INTERNAL_ERROR);
2843 ossl_statem_set_error(s);
2847 * For sigalgs freeze the handshake buffer. If we support
2848 * extms we've done this already so this is a no-op
2850 if (!ssl3_digest_cached_records(s, 1)) {
2851 ossl_statem_set_error(s);
2856 return WORK_FINISHED_CONTINUE;
2859 MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt)
2861 EVP_PKEY *pkey = NULL;
2862 const unsigned char *sig, *data;
2863 #ifndef OPENSSL_NO_GOST
2864 unsigned char *gost_data = NULL;
2866 int al, ret = MSG_PROCESS_ERROR;
2870 const EVP_MD *md = NULL;
2874 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
2877 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE);
2878 al = SSL_AD_INTERNAL_ERROR;
2882 peer = s->session->peer;
2883 pkey = X509_get0_pubkey(peer);
2884 type = X509_certificate_type(peer, pkey);
2886 if (!(type & EVP_PKT_SIGN)) {
2887 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY,
2888 SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2889 al = SSL_AD_ILLEGAL_PARAMETER;
2893 /* Check for broken implementations of GOST ciphersuites */
2895 * If key is GOST and n is exactly 64, it is bare signature without
2896 * length field (CryptoPro implementations at least till CSP 4.0)
2898 #ifndef OPENSSL_NO_GOST
2899 if (PACKET_remaining(pkt) == 64
2900 && EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) {
2905 if (SSL_USE_SIGALGS(s)) {
2908 if (!PACKET_get_bytes(pkt, &sig, 2)) {
2909 al = SSL_AD_DECODE_ERROR;
2912 rv = tls12_check_peer_sigalg(&md, s, sig, pkey);
2914 al = SSL_AD_INTERNAL_ERROR;
2916 } else if (rv == 0) {
2917 al = SSL_AD_DECODE_ERROR;
2921 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
2924 /* Use default digest for this key type */
2925 int idx = ssl_cert_type(NULL, pkey);
2927 md = s->s3->tmp.md[idx];
2929 al = SSL_AD_INTERNAL_ERROR;
2934 if (!PACKET_get_net_2(pkt, &len)) {
2935 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);
2936 al = SSL_AD_DECODE_ERROR;
2940 j = EVP_PKEY_size(pkey);
2941 if (((int)len > j) || ((int)PACKET_remaining(pkt) > j)
2942 || (PACKET_remaining(pkt) == 0)) {
2943 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE);
2944 al = SSL_AD_DECODE_ERROR;
2947 if (!PACKET_get_bytes(pkt, &data, len)) {
2948 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);
2949 al = SSL_AD_DECODE_ERROR;
2953 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
2954 if (hdatalen <= 0) {
2955 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
2956 al = SSL_AD_INTERNAL_ERROR;
2961 fprintf(stderr, "Using client verify alg %s\n", EVP_MD_name(md));
2963 if (!EVP_VerifyInit_ex(mctx, md, NULL)
2964 || !EVP_VerifyUpdate(mctx, hdata, hdatalen)) {
2965 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB);
2966 al = SSL_AD_INTERNAL_ERROR;
2969 #ifndef OPENSSL_NO_GOST
2971 int pktype = EVP_PKEY_id(pkey);
2972 if (pktype == NID_id_GostR3410_2001
2973 || pktype == NID_id_GostR3410_2012_256
2974 || pktype == NID_id_GostR3410_2012_512) {
2975 if ((gost_data = OPENSSL_malloc(len)) == NULL) {
2976 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE);
2977 al = SSL_AD_INTERNAL_ERROR;
2980 BUF_reverse(gost_data, data, len);
2986 if (s->version == SSL3_VERSION
2987 && !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET,
2988 (int)s->session->master_key_length,
2989 s->session->master_key)) {
2990 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB);
2991 al = SSL_AD_INTERNAL_ERROR;
2995 if (EVP_VerifyFinal(mctx, data, len, pkey) <= 0) {
2996 al = SSL_AD_DECRYPT_ERROR;
2997 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE);
3001 ret = MSG_PROCESS_CONTINUE_PROCESSING;
3004 ssl3_send_alert(s, SSL3_AL_FATAL, al);
3005 ossl_statem_set_error(s);
3007 BIO_free(s->s3->handshake_buffer);
3008 s->s3->handshake_buffer = NULL;
3009 EVP_MD_CTX_free(mctx);
3010 #ifndef OPENSSL_NO_GOST
3011 OPENSSL_free(gost_data);
3016 MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt)
3018 int i, al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR;
3020 unsigned long l, llen;
3021 const unsigned char *certstart, *certbytes;
3022 STACK_OF(X509) *sk = NULL;
3025 if ((sk = sk_X509_new_null()) == NULL) {
3026 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3030 if (!PACKET_get_net_3(pkt, &llen)
3031 || !PACKET_get_sub_packet(pkt, &spkt, llen)
3032 || PACKET_remaining(pkt) != 0) {
3033 al = SSL_AD_DECODE_ERROR;
3034 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
3038 while (PACKET_remaining(&spkt) > 0) {
3039 if (!PACKET_get_net_3(&spkt, &l)
3040 || !PACKET_get_bytes(&spkt, &certbytes, l)) {
3041 al = SSL_AD_DECODE_ERROR;
3042 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3043 SSL_R_CERT_LENGTH_MISMATCH);
3047 certstart = certbytes;
3048 x = d2i_X509(NULL, (const unsigned char **)&certbytes, l);
3050 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB);
3053 if (certbytes != (certstart + l)) {
3054 al = SSL_AD_DECODE_ERROR;
3055 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3056 SSL_R_CERT_LENGTH_MISMATCH);
3059 if (!sk_X509_push(sk, x)) {
3060 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3066 if (sk_X509_num(sk) <= 0) {
3067 /* TLS does not mind 0 certs returned */
3068 if (s->version == SSL3_VERSION) {
3069 al = SSL_AD_HANDSHAKE_FAILURE;
3070 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3071 SSL_R_NO_CERTIFICATES_RETURNED);
3074 /* Fail for TLS only if we required a certificate */
3075 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3076 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
3077 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3078 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3079 al = SSL_AD_HANDSHAKE_FAILURE;
3082 /* No client certificate so digest cached records */
3083 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) {
3088 i = ssl_verify_cert_chain(s, sk);
3090 al = ssl_verify_alarm_type(s->verify_result);
3091 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3092 SSL_R_CERTIFICATE_VERIFY_FAILED);
3096 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i);
3097 al = SSL_AD_HANDSHAKE_FAILURE;
3100 pkey = X509_get0_pubkey(sk_X509_value(sk, 0));
3102 al = SSL3_AD_HANDSHAKE_FAILURE;
3103 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3104 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
3109 X509_free(s->session->peer);
3110 s->session->peer = sk_X509_shift(sk);
3111 s->session->verify_result = s->verify_result;
3113 sk_X509_pop_free(s->session->peer_chain, X509_free);
3114 s->session->peer_chain = sk;
3117 * Freeze the handshake buffer. For <TLS1.3 we do this after the CKE
3120 if (SSL_IS_TLS13(s) && !ssl3_digest_cached_records(s, 1)) {
3121 al = SSL_AD_INTERNAL_ERROR;
3122 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3127 * Inconsistency alert: cert_chain does *not* include the peer's own
3128 * certificate, while we do include it in statem_clnt.c
3131 ret = MSG_PROCESS_CONTINUE_READING;
3135 ssl3_send_alert(s, SSL3_AL_FATAL, al);
3136 ossl_statem_set_error(s);
3139 sk_X509_pop_free(sk, X509_free);
3143 int tls_construct_server_certificate(SSL *s, WPACKET *pkt)
3147 cpk = ssl_get_server_send_pkey(s);
3149 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3153 if (!ssl3_output_cert_chain(s, pkt, cpk)) {
3154 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3161 int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt)
3163 unsigned char *senc = NULL;
3164 EVP_CIPHER_CTX *ctx = NULL;
3165 HMAC_CTX *hctx = NULL;
3166 unsigned char *p, *encdata1, *encdata2, *macdata1, *macdata2;
3167 const unsigned char *const_p;
3168 int len, slen_full, slen, lenfinal;
3171 SSL_CTX *tctx = s->initial_ctx;
3172 unsigned char iv[EVP_MAX_IV_LENGTH];
3173 unsigned char key_name[TLSEXT_KEYNAME_LENGTH];
3175 size_t macoffset, macendoffset;
3177 /* get session encoding length */
3178 slen_full = i2d_SSL_SESSION(s->session, NULL);
3180 * Some length values are 16 bits, so forget it if session is too
3183 if (slen_full == 0 || slen_full > 0xFF00) {
3184 ossl_statem_set_error(s);
3187 senc = OPENSSL_malloc(slen_full);
3189 ossl_statem_set_error(s);
3193 ctx = EVP_CIPHER_CTX_new();
3194 hctx = HMAC_CTX_new();
3195 if (ctx == NULL || hctx == NULL) {
3196 SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
3201 if (!i2d_SSL_SESSION(s->session, &p))
3205 * create a fresh copy (not shared with other threads) to clean up
3208 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3211 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3213 slen = i2d_SSL_SESSION(sess, NULL);
3214 if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */
3215 SSL_SESSION_free(sess);
3219 if (!i2d_SSL_SESSION(sess, &p)) {
3220 SSL_SESSION_free(sess);
3223 SSL_SESSION_free(sess);
3226 * Initialize HMAC and cipher contexts. If callback present it does
3227 * all the work otherwise use generated values from parent ctx.
3229 if (tctx->tlsext_ticket_key_cb) {
3230 /* if 0 is returned, write an empty ticket */
3231 int ret = tctx->tlsext_ticket_key_cb(s, key_name, iv, ctx,
3236 /* Put timeout and length */
3237 if (!WPACKET_put_bytes_u32(pkt, 0)
3238 || !WPACKET_put_bytes_u16(pkt, 0)) {
3239 SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET,
3240 ERR_R_INTERNAL_ERROR);
3244 EVP_CIPHER_CTX_free(ctx);
3245 HMAC_CTX_free(hctx);
3250 iv_len = EVP_CIPHER_CTX_iv_length(ctx);
3252 const EVP_CIPHER *cipher = EVP_aes_256_cbc();
3254 iv_len = EVP_CIPHER_iv_length(cipher);
3255 if (RAND_bytes(iv, iv_len) <= 0)
3257 if (!EVP_EncryptInit_ex(ctx, cipher, NULL,
3258 tctx->tlsext_tick_aes_key, iv))
3260 if (!HMAC_Init_ex(hctx, tctx->tlsext_tick_hmac_key,
3261 sizeof(tctx->tlsext_tick_hmac_key),
3262 EVP_sha256(), NULL))
3264 memcpy(key_name, tctx->tlsext_tick_key_name,
3265 sizeof(tctx->tlsext_tick_key_name));
3269 * Ticket lifetime hint (advisory only): We leave this unspecified
3270 * for resumed session (for simplicity), and guess that tickets for
3271 * new sessions will live as long as their sessions.
3273 if (!WPACKET_put_bytes_u32(pkt, s->hit ? 0 : s->session->timeout)
3274 /* Now the actual ticket data */
3275 || !WPACKET_start_sub_packet_u16(pkt)
3276 || !WPACKET_get_total_written(pkt, &macoffset)
3277 /* Output key name */
3278 || !WPACKET_memcpy(pkt, key_name, sizeof(key_name))
3280 || !WPACKET_memcpy(pkt, iv, iv_len)
3281 || !WPACKET_reserve_bytes(pkt, slen + EVP_MAX_BLOCK_LENGTH,
3283 /* Encrypt session data */
3284 || !EVP_EncryptUpdate(ctx, encdata1, &len, senc, slen)
3285 || !WPACKET_allocate_bytes(pkt, len, &encdata2)
3286 || encdata1 != encdata2
3287 || !EVP_EncryptFinal(ctx, encdata1 + len, &lenfinal)
3288 || !WPACKET_allocate_bytes(pkt, lenfinal, &encdata2)
3289 || encdata1 + len != encdata2
3290 || len + lenfinal > slen + EVP_MAX_BLOCK_LENGTH
3291 || !WPACKET_get_total_written(pkt, &macendoffset)
3292 || !HMAC_Update(hctx,
3293 (unsigned char *)s->init_buf->data + macoffset,
3294 macendoffset - macoffset)
3295 || !WPACKET_reserve_bytes(pkt, EVP_MAX_MD_SIZE, &macdata1)
3296 || !HMAC_Final(hctx, macdata1, &hlen)
3297 || hlen > EVP_MAX_MD_SIZE
3298 || !WPACKET_allocate_bytes(pkt, hlen, &macdata2)
3299 || macdata1 != macdata2
3300 || !WPACKET_close(pkt)) {
3301 SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
3304 EVP_CIPHER_CTX_free(ctx);
3305 HMAC_CTX_free(hctx);
3311 EVP_CIPHER_CTX_free(ctx);
3312 HMAC_CTX_free(hctx);
3313 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3317 int tls_construct_cert_status(SSL *s, WPACKET *pkt)
3319 if (!WPACKET_put_bytes_u8(pkt, s->tlsext_status_type)
3320 || !WPACKET_sub_memcpy_u24(pkt, s->tlsext_ocsp_resp,
3321 s->tlsext_ocsp_resplen)) {
3322 SSLerr(SSL_F_TLS_CONSTRUCT_CERT_STATUS, ERR_R_INTERNAL_ERROR);
3323 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3330 #ifndef OPENSSL_NO_NEXTPROTONEG
3332 * tls_process_next_proto reads a Next Protocol Negotiation handshake message.
3333 * It sets the next_proto member in s if found
3335 MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt)
3337 PACKET next_proto, padding;
3338 size_t next_proto_len;
3341 * The payload looks like:
3343 * uint8 proto[proto_len];
3344 * uint8 padding_len;
3345 * uint8 padding[padding_len];
3347 if (!PACKET_get_length_prefixed_1(pkt, &next_proto)
3348 || !PACKET_get_length_prefixed_1(pkt, &padding)
3349 || PACKET_remaining(pkt) > 0) {
3350 SSLerr(SSL_F_TLS_PROCESS_NEXT_PROTO, SSL_R_LENGTH_MISMATCH);
3354 if (!PACKET_memdup(&next_proto, &s->next_proto_negotiated, &next_proto_len)) {
3355 s->next_proto_negotiated_len = 0;
3359 s->next_proto_negotiated_len = (unsigned char)next_proto_len;
3361 return MSG_PROCESS_CONTINUE_READING;
3363 ossl_statem_set_error(s);
3364 return MSG_PROCESS_ERROR;
3368 static int tls_construct_encrypted_extensions(SSL *s, WPACKET *pkt)
3370 /* TODO(TLS1.3): Zero length encrypted extensions message for now */
3371 if (!WPACKET_put_bytes_u16(pkt, 0)) {
3372 SSLerr(SSL_F_TLS_CONSTRUCT_ENCRYPTED_EXTENSIONS, ERR_R_INTERNAL_ERROR);
3373 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3380 #define SSLV2_CIPHER_LEN 3
3382 STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,
3383 PACKET *cipher_suites,
3384 STACK_OF(SSL_CIPHER) **skp,
3385 int sslv2format, int *al)
3387 const SSL_CIPHER *c;
3388 STACK_OF(SSL_CIPHER) *sk;
3390 /* 3 = SSLV2_CIPHER_LEN > TLS_CIPHER_LEN = 2. */
3391 unsigned char cipher[SSLV2_CIPHER_LEN];
3393 s->s3->send_connection_binding = 0;
3395 n = sslv2format ? SSLV2_CIPHER_LEN : TLS_CIPHER_LEN;
3397 if (PACKET_remaining(cipher_suites) == 0) {
3398 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, SSL_R_NO_CIPHERS_SPECIFIED);
3399 *al = SSL_AD_ILLEGAL_PARAMETER;
3403 if (PACKET_remaining(cipher_suites) % n != 0) {
3404 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3405 SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
3406 *al = SSL_AD_DECODE_ERROR;
3410 if ((skp == NULL) || (*skp == NULL)) {
3411 sk = sk_SSL_CIPHER_new_null(); /* change perhaps later */
3413 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
3414 *al = SSL_AD_INTERNAL_ERROR;
3419 sk_SSL_CIPHER_zero(sk);
3422 if (!PACKET_memdup(cipher_suites, &s->s3->tmp.ciphers_raw,
3423 &s->s3->tmp.ciphers_rawlen)) {
3424 *al = SSL_AD_INTERNAL_ERROR;
3428 while (PACKET_copy_bytes(cipher_suites, cipher, n)) {
3430 * SSLv3 ciphers wrapped in an SSLv2-compatible ClientHello have the
3431 * first byte set to zero, while true SSLv2 ciphers have a non-zero
3432 * first byte. We don't support any true SSLv2 ciphers, so skip them.
3434 if (sslv2format && cipher[0] != '\0')
3437 /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */
3438 if ((cipher[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) &&
3439 (cipher[n - 1] == (SSL3_CK_SCSV & 0xff))) {
3440 /* SCSV fatal if renegotiating */
3441 if (s->renegotiate) {
3442 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3443 SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING);
3444 *al = SSL_AD_HANDSHAKE_FAILURE;
3447 s->s3->send_connection_binding = 1;
3451 /* Check for TLS_FALLBACK_SCSV */
3452 if ((cipher[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) &&
3453 (cipher[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) {
3455 * The SCSV indicates that the client previously tried a higher
3456 * version. Fail if the current version is an unexpected
3459 if (!ssl_check_version_downgrade(s)) {
3460 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3461 SSL_R_INAPPROPRIATE_FALLBACK);
3462 *al = SSL_AD_INAPPROPRIATE_FALLBACK;
3468 /* For SSLv2-compat, ignore leading 0-byte. */
3469 c = ssl_get_cipher_by_char(s, sslv2format ? &cipher[1] : cipher);
3471 if (!sk_SSL_CIPHER_push(sk, c)) {
3472 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
3473 *al = SSL_AD_INTERNAL_ERROR;
3478 if (PACKET_remaining(cipher_suites) > 0) {
3479 *al = SSL_AD_INTERNAL_ERROR;
3480 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_INTERNAL_ERROR);
3488 if ((skp == NULL) || (*skp == NULL))
3489 sk_SSL_CIPHER_free(sk);