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) {
166 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
167 if (mt == SSL3_MT_CLIENT_HELLO) {
168 st->hand_state = TLS_ST_SR_CLNT_HELLO;
173 case TLS_ST_SW_SRVR_DONE:
175 * If we get a CKE message after a ServerDone then either
176 * 1) We didn't request a Certificate
178 * 2) If we did request one then
179 * a) We allow no Certificate to be returned
181 * b) We are running SSL3 (in TLS1.0+ the client must return a 0
182 * list if we requested a certificate)
184 if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) {
185 if (s->s3->tmp.cert_request) {
186 if (s->version == SSL3_VERSION) {
187 if ((s->verify_mode & SSL_VERIFY_PEER)
188 && (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
190 * This isn't an unexpected message as such - we're just
191 * not going to accept it because we require a client
194 ssl3_send_alert(s, SSL3_AL_FATAL,
195 SSL3_AD_HANDSHAKE_FAILURE);
196 SSLerr(SSL_F_OSSL_STATEM_SERVER_READ_TRANSITION,
197 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
200 st->hand_state = TLS_ST_SR_KEY_EXCH;
204 st->hand_state = TLS_ST_SR_KEY_EXCH;
207 } else if (s->s3->tmp.cert_request) {
208 if (mt == SSL3_MT_CERTIFICATE) {
209 st->hand_state = TLS_ST_SR_CERT;
216 if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) {
217 st->hand_state = TLS_ST_SR_KEY_EXCH;
222 case TLS_ST_SR_KEY_EXCH:
224 * We should only process a CertificateVerify message if we have
225 * received a Certificate from the client. If so then |s->session->peer|
226 * will be non NULL. In some instances a CertificateVerify message is
227 * not required even if the peer has sent a Certificate (e.g. such as in
228 * the case of static DH). In that case |st->no_cert_verify| should be
231 if (s->session->peer == NULL || st->no_cert_verify) {
232 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
234 * For the ECDH ciphersuites when the client sends its ECDH
235 * pub key in a certificate, the CertificateVerify message is
236 * not sent. Also for GOST ciphersuites when the client uses
237 * its key from the certificate for key exchange.
239 st->hand_state = TLS_ST_SR_CHANGE;
243 if (mt == SSL3_MT_CERTIFICATE_VERIFY) {
244 st->hand_state = TLS_ST_SR_CERT_VRFY;
250 case TLS_ST_SR_CERT_VRFY:
251 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
252 st->hand_state = TLS_ST_SR_CHANGE;
257 case TLS_ST_SR_CHANGE:
258 #ifndef OPENSSL_NO_NEXTPROTONEG
259 if (s->s3->npn_seen) {
260 if (mt == SSL3_MT_NEXT_PROTO) {
261 st->hand_state = TLS_ST_SR_NEXT_PROTO;
266 if (mt == SSL3_MT_FINISHED) {
267 st->hand_state = TLS_ST_SR_FINISHED;
270 #ifndef OPENSSL_NO_NEXTPROTONEG
275 #ifndef OPENSSL_NO_NEXTPROTONEG
276 case TLS_ST_SR_NEXT_PROTO:
277 if (mt == SSL3_MT_FINISHED) {
278 st->hand_state = TLS_ST_SR_FINISHED;
284 case TLS_ST_SW_FINISHED:
285 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
286 st->hand_state = TLS_ST_SR_CHANGE;
293 /* No valid transition found */
294 ssl3_send_alert(s, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE);
295 SSLerr(SSL_F_OSSL_STATEM_SERVER_READ_TRANSITION, SSL_R_UNEXPECTED_MESSAGE);
300 * Should we send a ServerKeyExchange message?
302 * Valid return values are:
306 static int send_server_key_exchange(SSL *s)
308 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
311 * only send a ServerKeyExchange if DH or fortezza but we have a
312 * sign only certificate PSK: may send PSK identity hints For
313 * ECC ciphersuites, we send a serverKeyExchange message only if
314 * the cipher suite is either ECDH-anon or ECDHE. In other cases,
315 * the server certificate contains the server's public key for
318 if (alg_k & (SSL_kDHE | SSL_kECDHE)
320 * PSK: send ServerKeyExchange if PSK identity hint if
323 #ifndef OPENSSL_NO_PSK
324 /* Only send SKE if we have identity hint for plain PSK */
325 || ((alg_k & (SSL_kPSK | SSL_kRSAPSK))
326 && s->cert->psk_identity_hint)
327 /* For other PSK always send SKE */
328 || (alg_k & (SSL_PSK & (SSL_kDHEPSK | SSL_kECDHEPSK)))
330 #ifndef OPENSSL_NO_SRP
331 /* SRP: send ServerKeyExchange */
332 || (alg_k & SSL_kSRP)
342 * Should we send a CertificateRequest message?
344 * Valid return values are:
348 static int send_certificate_request(SSL *s)
351 /* don't request cert unless asked for it: */
352 s->verify_mode & SSL_VERIFY_PEER
354 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
355 * during re-negotiation:
357 && (s->s3->tmp.finish_md_len == 0 ||
358 !(s->verify_mode & SSL_VERIFY_CLIENT_ONCE))
360 * never request cert in anonymous ciphersuites (see
361 * section "Certificate request" in SSL 3 drafts and in
364 && (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
366 * ... except when the application insists on
367 * verification (against the specs, but statem_clnt.c accepts
370 || (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
371 /* don't request certificate for SRP auth */
372 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP)
374 * With normal PSK Certificates and Certificate Requests
377 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aPSK)) {
385 * ossl_statem_server13_write_transition() works out what handshake state to
386 * move to next when a TLSv1.3 server is writing messages to be sent to the
389 static WRITE_TRAN ossl_statem_server13_write_transition(SSL *s)
391 OSSL_STATEM *st = &s->statem;
394 * TODO(TLS1.3): This is still based on the TLSv1.2 state machine. Over time
395 * we will update this to look more like real TLSv1.3
399 * No case for TLS_ST_BEFORE, because at that stage we have not negotiated
400 * TLSv1.3 yet, so that is handled by ossl_statem_server_write_transition()
403 switch (st->hand_state) {
405 /* Shouldn't happen */
406 return WRITE_TRAN_ERROR;
408 case TLS_ST_SR_CLNT_HELLO:
409 st->hand_state = TLS_ST_SW_SRVR_HELLO;
410 return WRITE_TRAN_CONTINUE;
412 case TLS_ST_SW_SRVR_HELLO:
413 st->hand_state = TLS_ST_SW_ENCRYPTED_EXTENSIONS;
414 return WRITE_TRAN_CONTINUE;
416 case TLS_ST_SW_ENCRYPTED_EXTENSIONS:
418 st->hand_state = TLS_ST_SW_FINISHED;
419 else if (send_certificate_request(s))
420 st->hand_state = TLS_ST_SW_CERT_REQ;
422 st->hand_state = TLS_ST_SW_CERT;
424 return WRITE_TRAN_CONTINUE;
426 case TLS_ST_SW_CERT_REQ:
427 st->hand_state = TLS_ST_SW_CERT;
428 return WRITE_TRAN_CONTINUE;
431 st->hand_state = TLS_ST_SW_CERT_VRFY;
432 return WRITE_TRAN_CONTINUE;
434 case TLS_ST_SW_CERT_VRFY:
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:
443 * Technically we have finished the handshake at this point, but we're
444 * going to remain "in_init" for now and write out the session ticket
446 * TODO(TLS1.3): Perhaps we need to be able to control this behaviour
447 * and give the application the opportunity to delay sending the
450 st->hand_state = TLS_ST_SW_SESSION_TICKET;
451 return WRITE_TRAN_CONTINUE;
453 case TLS_ST_SW_SESSION_TICKET:
454 st->hand_state = TLS_ST_OK;
455 ossl_statem_set_in_init(s, 0);
456 return WRITE_TRAN_CONTINUE;
461 * ossl_statem_server_write_transition() works out what handshake state to move
462 * to next when the server is writing messages to be sent to the client.
464 WRITE_TRAN ossl_statem_server_write_transition(SSL *s)
466 OSSL_STATEM *st = &s->statem;
469 * Note that before the ClientHello we don't know what version we are going
470 * to negotiate yet, so we don't take this branch until later
474 return ossl_statem_server13_write_transition(s);
476 switch (st->hand_state) {
478 /* Shouldn't happen */
479 return WRITE_TRAN_ERROR;
482 if (st->request_state == TLS_ST_SW_HELLO_REQ) {
483 /* We must be trying to renegotiate */
484 st->hand_state = TLS_ST_SW_HELLO_REQ;
485 st->request_state = TLS_ST_BEFORE;
486 return WRITE_TRAN_CONTINUE;
488 /* Must be an incoming ClientHello */
489 if (!tls_setup_handshake(s)) {
490 ossl_statem_set_error(s);
491 return WRITE_TRAN_ERROR;
496 /* Just go straight to trying to read from the client */
497 return WRITE_TRAN_FINISHED;
499 case TLS_ST_SW_HELLO_REQ:
500 st->hand_state = TLS_ST_OK;
501 ossl_statem_set_in_init(s, 0);
502 return WRITE_TRAN_CONTINUE;
504 case TLS_ST_SR_CLNT_HELLO:
505 if (SSL_IS_DTLS(s) && !s->d1->cookie_verified
506 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
507 st->hand_state = DTLS_ST_SW_HELLO_VERIFY_REQUEST;
509 st->hand_state = TLS_ST_SW_SRVR_HELLO;
510 return WRITE_TRAN_CONTINUE;
512 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
513 return WRITE_TRAN_FINISHED;
515 case TLS_ST_SW_SRVR_HELLO:
517 if (s->ext.ticket_expected)
518 st->hand_state = TLS_ST_SW_SESSION_TICKET;
520 st->hand_state = TLS_ST_SW_CHANGE;
522 /* Check if it is anon DH or anon ECDH, */
523 /* normal PSK or SRP */
524 if (!(s->s3->tmp.new_cipher->algorithm_auth &
525 (SSL_aNULL | SSL_aSRP | SSL_aPSK))) {
526 st->hand_state = TLS_ST_SW_CERT;
527 } else if (send_server_key_exchange(s)) {
528 st->hand_state = TLS_ST_SW_KEY_EXCH;
529 } else if (send_certificate_request(s)) {
530 st->hand_state = TLS_ST_SW_CERT_REQ;
532 st->hand_state = TLS_ST_SW_SRVR_DONE;
535 return WRITE_TRAN_CONTINUE;
538 if (s->ext.status_expected) {
539 st->hand_state = TLS_ST_SW_CERT_STATUS;
540 return WRITE_TRAN_CONTINUE;
544 case TLS_ST_SW_CERT_STATUS:
545 if (send_server_key_exchange(s)) {
546 st->hand_state = TLS_ST_SW_KEY_EXCH;
547 return WRITE_TRAN_CONTINUE;
551 case TLS_ST_SW_KEY_EXCH:
552 if (send_certificate_request(s)) {
553 st->hand_state = TLS_ST_SW_CERT_REQ;
554 return WRITE_TRAN_CONTINUE;
558 case TLS_ST_SW_CERT_REQ:
559 st->hand_state = TLS_ST_SW_SRVR_DONE;
560 return WRITE_TRAN_CONTINUE;
562 case TLS_ST_SW_SRVR_DONE:
563 return WRITE_TRAN_FINISHED;
565 case TLS_ST_SR_FINISHED:
567 st->hand_state = TLS_ST_OK;
568 ossl_statem_set_in_init(s, 0);
569 return WRITE_TRAN_CONTINUE;
570 } else if (s->ext.ticket_expected) {
571 st->hand_state = TLS_ST_SW_SESSION_TICKET;
573 st->hand_state = TLS_ST_SW_CHANGE;
575 return WRITE_TRAN_CONTINUE;
577 case TLS_ST_SW_SESSION_TICKET:
578 st->hand_state = TLS_ST_SW_CHANGE;
579 return WRITE_TRAN_CONTINUE;
581 case TLS_ST_SW_CHANGE:
582 st->hand_state = TLS_ST_SW_FINISHED;
583 return WRITE_TRAN_CONTINUE;
585 case TLS_ST_SW_FINISHED:
587 return WRITE_TRAN_FINISHED;
589 st->hand_state = TLS_ST_OK;
590 ossl_statem_set_in_init(s, 0);
591 return WRITE_TRAN_CONTINUE;
596 * Perform any pre work that needs to be done prior to sending a message from
597 * the server to the client.
599 WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst)
601 OSSL_STATEM *st = &s->statem;
603 switch (st->hand_state) {
605 /* No pre work to be done */
608 case TLS_ST_SW_HELLO_REQ:
611 dtls1_clear_sent_buffer(s);
614 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
616 if (SSL_IS_DTLS(s)) {
617 dtls1_clear_sent_buffer(s);
618 /* We don't buffer this message so don't use the timer */
623 case TLS_ST_SW_SRVR_HELLO:
624 if (SSL_IS_DTLS(s)) {
626 * Messages we write from now on should be bufferred and
627 * retransmitted if necessary, so we need to use the timer now
633 case TLS_ST_SW_SRVR_DONE:
634 #ifndef OPENSSL_NO_SCTP
635 if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s)))
636 return dtls_wait_for_dry(s);
638 return WORK_FINISHED_CONTINUE;
640 case TLS_ST_SW_SESSION_TICKET:
641 if (SSL_IS_TLS13(s)) {
643 * Actually this is the end of the handshake, but we're going
644 * straight into writing the session ticket out. So we finish off
645 * the handshake, but keep the various buffers active.
647 return tls_finish_handshake(s, wst, 0);
648 } if (SSL_IS_DTLS(s)) {
650 * We're into the last flight. We don't retransmit the last flight
651 * unless we need to, so we don't use the timer
657 case TLS_ST_SW_CHANGE:
658 s->session->cipher = s->s3->tmp.new_cipher;
659 if (!s->method->ssl3_enc->setup_key_block(s)) {
660 ossl_statem_set_error(s);
663 if (SSL_IS_DTLS(s)) {
665 * We're into the last flight. We don't retransmit the last flight
666 * unless we need to, so we don't use the timer. This might have
667 * already been set to 0 if we sent a NewSessionTicket message,
668 * but we'll set it again here in case we didn't.
672 return WORK_FINISHED_CONTINUE;
675 return tls_finish_handshake(s, wst, 1);
678 return WORK_FINISHED_CONTINUE;
682 * Perform any work that needs to be done after sending a message from the
683 * server to the client.
685 WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst)
687 OSSL_STATEM *st = &s->statem;
691 switch (st->hand_state) {
693 /* No post work to be done */
696 case TLS_ST_SW_HELLO_REQ:
697 if (statem_flush(s) != 1)
699 if (!ssl3_init_finished_mac(s)) {
700 ossl_statem_set_error(s);
705 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
706 if (statem_flush(s) != 1)
708 /* HelloVerifyRequest resets Finished MAC */
709 if (s->version != DTLS1_BAD_VER && !ssl3_init_finished_mac(s)) {
710 ossl_statem_set_error(s);
714 * The next message should be another ClientHello which we need to
715 * treat like it was the first packet
720 case TLS_ST_SW_SRVR_HELLO:
721 #ifndef OPENSSL_NO_SCTP
722 if (SSL_IS_DTLS(s) && s->hit) {
723 unsigned char sctpauthkey[64];
724 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
727 * Add new shared key for SCTP-Auth, will be ignored if no
730 memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
731 sizeof(DTLS1_SCTP_AUTH_LABEL));
733 if (SSL_export_keying_material(s, sctpauthkey,
734 sizeof(sctpauthkey), labelbuffer,
735 sizeof(labelbuffer), NULL, 0,
737 ossl_statem_set_error(s);
741 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
742 sizeof(sctpauthkey), sctpauthkey);
746 * TODO(TLS1.3): This actually causes a problem. We don't yet know
747 * whether the next record we are going to receive is an unencrypted
748 * alert, or an encrypted handshake message. We're going to need
749 * something clever in the record layer for this.
751 if (SSL_IS_TLS13(s)) {
752 if (!s->method->ssl3_enc->setup_key_block(s)
753 || !s->method->ssl3_enc->change_cipher_state(s,
754 SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_SERVER_WRITE)
755 || !s->method->ssl3_enc->change_cipher_state(s,
756 SSL3_CC_HANDSHAKE |SSL3_CHANGE_CIPHER_SERVER_READ))
761 case TLS_ST_SW_CHANGE:
762 #ifndef OPENSSL_NO_SCTP
763 if (SSL_IS_DTLS(s) && !s->hit) {
765 * Change to new shared key of SCTP-Auth, will be ignored if
768 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
772 if (!s->method->ssl3_enc->change_cipher_state(s,
773 SSL3_CHANGE_CIPHER_SERVER_WRITE))
775 ossl_statem_set_error(s);
780 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
783 case TLS_ST_SW_SRVR_DONE:
784 if (statem_flush(s) != 1)
788 case TLS_ST_SW_FINISHED:
789 if (statem_flush(s) != 1)
791 #ifndef OPENSSL_NO_SCTP
792 if (SSL_IS_DTLS(s) && s->hit) {
794 * Change to new shared key of SCTP-Auth, will be ignored if
797 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
801 if (SSL_IS_TLS13(s)) {
802 if (!s->method->ssl3_enc->generate_master_secret(s,
803 s->master_secret, s->handshake_secret, 0,
804 &s->session->master_key_length)
805 || !s->method->ssl3_enc->change_cipher_state(s,
806 SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_SERVER_WRITE))
811 case TLS_ST_SW_SESSION_TICKET:
812 if (SSL_IS_TLS13(s) && statem_flush(s) != 1)
817 return WORK_FINISHED_CONTINUE;
821 * Get the message construction function and message type for sending from the
824 * Valid return values are:
828 int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt,
829 confunc_f *confunc, int *mt)
831 OSSL_STATEM *st = &s->statem;
833 switch (st->hand_state) {
835 /* Shouldn't happen */
838 case TLS_ST_SW_CHANGE:
840 *confunc = dtls_construct_change_cipher_spec;
842 *confunc = tls_construct_change_cipher_spec;
843 *mt = SSL3_MT_CHANGE_CIPHER_SPEC;
846 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
847 *confunc = dtls_construct_hello_verify_request;
848 *mt = DTLS1_MT_HELLO_VERIFY_REQUEST;
851 case TLS_ST_SW_HELLO_REQ:
852 /* No construction function needed */
854 *mt = SSL3_MT_HELLO_REQUEST;
857 case TLS_ST_SW_SRVR_HELLO:
858 *confunc = tls_construct_server_hello;
859 *mt = SSL3_MT_SERVER_HELLO;
863 *confunc = tls_construct_server_certificate;
864 *mt = SSL3_MT_CERTIFICATE;
867 case TLS_ST_SW_CERT_VRFY:
868 *confunc = tls_construct_cert_verify;
869 *mt = SSL3_MT_CERTIFICATE_VERIFY;
873 case TLS_ST_SW_KEY_EXCH:
874 *confunc = tls_construct_server_key_exchange;
875 *mt = SSL3_MT_SERVER_KEY_EXCHANGE;
878 case TLS_ST_SW_CERT_REQ:
879 *confunc = tls_construct_certificate_request;
880 *mt = SSL3_MT_CERTIFICATE_REQUEST;
883 case TLS_ST_SW_SRVR_DONE:
884 *confunc = tls_construct_server_done;
885 *mt = SSL3_MT_SERVER_DONE;
888 case TLS_ST_SW_SESSION_TICKET:
889 *confunc = tls_construct_new_session_ticket;
890 *mt = SSL3_MT_NEWSESSION_TICKET;
893 case TLS_ST_SW_CERT_STATUS:
894 *confunc = tls_construct_cert_status;
895 *mt = SSL3_MT_CERTIFICATE_STATUS;
898 case TLS_ST_SW_FINISHED:
899 *confunc = tls_construct_finished;
900 *mt = SSL3_MT_FINISHED;
903 case TLS_ST_SW_ENCRYPTED_EXTENSIONS:
904 *confunc = tls_construct_encrypted_extensions;
905 *mt = SSL3_MT_ENCRYPTED_EXTENSIONS;
913 * Maximum size (excluding the Handshake header) of a ClientHello message,
914 * calculated as follows:
916 * 2 + # client_version
917 * 32 + # only valid length for random
918 * 1 + # length of session_id
919 * 32 + # maximum size for session_id
920 * 2 + # length of cipher suites
921 * 2^16-2 + # maximum length of cipher suites array
922 * 1 + # length of compression_methods
923 * 2^8-1 + # maximum length of compression methods
924 * 2 + # length of extensions
925 * 2^16-1 # maximum length of extensions
927 #define CLIENT_HELLO_MAX_LENGTH 131396
929 #define CLIENT_KEY_EXCH_MAX_LENGTH 2048
930 #define NEXT_PROTO_MAX_LENGTH 514
933 * Returns the maximum allowed length for the current message that we are
934 * reading. Excludes the message header.
936 size_t ossl_statem_server_max_message_size(SSL *s)
938 OSSL_STATEM *st = &s->statem;
940 switch (st->hand_state) {
942 /* Shouldn't happen */
945 case TLS_ST_SR_CLNT_HELLO:
946 return CLIENT_HELLO_MAX_LENGTH;
949 return s->max_cert_list;
951 case TLS_ST_SR_KEY_EXCH:
952 return CLIENT_KEY_EXCH_MAX_LENGTH;
954 case TLS_ST_SR_CERT_VRFY:
955 return SSL3_RT_MAX_PLAIN_LENGTH;
957 #ifndef OPENSSL_NO_NEXTPROTONEG
958 case TLS_ST_SR_NEXT_PROTO:
959 return NEXT_PROTO_MAX_LENGTH;
962 case TLS_ST_SR_CHANGE:
963 return CCS_MAX_LENGTH;
965 case TLS_ST_SR_FINISHED:
966 return FINISHED_MAX_LENGTH;
971 * Process a message that the server has received from the client.
973 MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt)
975 OSSL_STATEM *st = &s->statem;
977 switch (st->hand_state) {
979 /* Shouldn't happen */
980 return MSG_PROCESS_ERROR;
982 case TLS_ST_SR_CLNT_HELLO:
983 return tls_process_client_hello(s, pkt);
986 return tls_process_client_certificate(s, pkt);
988 case TLS_ST_SR_KEY_EXCH:
989 return tls_process_client_key_exchange(s, pkt);
991 case TLS_ST_SR_CERT_VRFY:
992 return tls_process_cert_verify(s, pkt);
994 #ifndef OPENSSL_NO_NEXTPROTONEG
995 case TLS_ST_SR_NEXT_PROTO:
996 return tls_process_next_proto(s, pkt);
999 case TLS_ST_SR_CHANGE:
1000 return tls_process_change_cipher_spec(s, pkt);
1002 case TLS_ST_SR_FINISHED:
1003 return tls_process_finished(s, pkt);
1008 * Perform any further processing required following the receipt of a message
1011 WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst)
1013 OSSL_STATEM *st = &s->statem;
1015 switch (st->hand_state) {
1017 /* Shouldn't happen */
1020 case TLS_ST_SR_CLNT_HELLO:
1021 return tls_post_process_client_hello(s, wst);
1023 case TLS_ST_SR_KEY_EXCH:
1024 return tls_post_process_client_key_exchange(s, wst);
1026 case TLS_ST_SR_CERT_VRFY:
1027 #ifndef OPENSSL_NO_SCTP
1028 if ( /* Is this SCTP? */
1029 BIO_dgram_is_sctp(SSL_get_wbio(s))
1030 /* Are we renegotiating? */
1031 && s->renegotiate && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
1032 s->s3->in_read_app_data = 2;
1033 s->rwstate = SSL_READING;
1034 BIO_clear_retry_flags(SSL_get_rbio(s));
1035 BIO_set_retry_read(SSL_get_rbio(s));
1036 ossl_statem_set_sctp_read_sock(s, 1);
1039 ossl_statem_set_sctp_read_sock(s, 0);
1042 return WORK_FINISHED_CONTINUE;
1044 return WORK_FINISHED_CONTINUE;
1047 #ifndef OPENSSL_NO_SRP
1048 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
1050 int ret = SSL_ERROR_NONE;
1052 *al = SSL_AD_UNRECOGNIZED_NAME;
1054 if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
1055 (s->srp_ctx.TLS_ext_srp_username_callback != NULL)) {
1056 if (s->srp_ctx.login == NULL) {
1058 * RFC 5054 says SHOULD reject, we do so if There is no srp
1061 ret = SSL3_AL_FATAL;
1062 *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
1064 ret = SSL_srp_server_param_with_username(s, al);
1071 int dtls_raw_hello_verify_request(WPACKET *pkt, unsigned char *cookie,
1074 /* Always use DTLS 1.0 version: see RFC 6347 */
1075 if (!WPACKET_put_bytes_u16(pkt, DTLS1_VERSION)
1076 || !WPACKET_sub_memcpy_u8(pkt, cookie, cookie_len))
1082 int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt)
1084 unsigned int cookie_leni;
1085 if (s->ctx->app_gen_cookie_cb == NULL ||
1086 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
1087 &cookie_leni) == 0 ||
1088 cookie_leni > 255) {
1089 SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST,
1090 SSL_R_COOKIE_GEN_CALLBACK_FAILURE);
1093 s->d1->cookie_len = cookie_leni;
1095 if (!dtls_raw_hello_verify_request(pkt, s->d1->cookie,
1096 s->d1->cookie_len)) {
1097 SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST, ERR_R_INTERNAL_ERROR);
1104 #ifndef OPENSSL_NO_EC
1106 * ssl_check_for_safari attempts to fingerprint Safari using OS X
1107 * SecureTransport using the TLS extension block in |hello|.
1108 * Safari, since 10.6, sends exactly these extensions, in this order:
1113 * We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8,
1114 * but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them.
1115 * Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from
1116 * 10.8..10.8.3 (which don't work).
1118 static void ssl_check_for_safari(SSL *s, const CLIENTHELLO_MSG *hello)
1120 static const unsigned char kSafariExtensionsBlock[] = {
1121 0x00, 0x0a, /* elliptic_curves extension */
1122 0x00, 0x08, /* 8 bytes */
1123 0x00, 0x06, /* 6 bytes of curve ids */
1124 0x00, 0x17, /* P-256 */
1125 0x00, 0x18, /* P-384 */
1126 0x00, 0x19, /* P-521 */
1128 0x00, 0x0b, /* ec_point_formats */
1129 0x00, 0x02, /* 2 bytes */
1130 0x01, /* 1 point format */
1131 0x00, /* uncompressed */
1132 /* The following is only present in TLS 1.2 */
1133 0x00, 0x0d, /* signature_algorithms */
1134 0x00, 0x0c, /* 12 bytes */
1135 0x00, 0x0a, /* 10 bytes */
1136 0x05, 0x01, /* SHA-384/RSA */
1137 0x04, 0x01, /* SHA-256/RSA */
1138 0x02, 0x01, /* SHA-1/RSA */
1139 0x04, 0x03, /* SHA-256/ECDSA */
1140 0x02, 0x03, /* SHA-1/ECDSA */
1142 /* Length of the common prefix (first two extensions). */
1143 static const size_t kSafariCommonExtensionsLength = 18;
1148 tmppkt = hello->extensions;
1150 if (!PACKET_forward(&tmppkt, 2)
1151 || !PACKET_get_net_2(&tmppkt, &type)
1152 || !PACKET_get_length_prefixed_2(&tmppkt, &sni)) {
1156 if (type != TLSEXT_TYPE_server_name)
1159 ext_len = TLS1_get_client_version(s) >= TLS1_2_VERSION ?
1160 sizeof(kSafariExtensionsBlock) : kSafariCommonExtensionsLength;
1162 s->s3->is_probably_safari = PACKET_equal(&tmppkt, kSafariExtensionsBlock,
1165 #endif /* !OPENSSL_NO_EC */
1167 MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt)
1169 int i, al = SSL_AD_INTERNAL_ERROR;
1173 const SSL_CIPHER *c;
1174 #ifndef OPENSSL_NO_COMP
1175 SSL_COMP *comp = NULL;
1177 STACK_OF(SSL_CIPHER) *ciphers = NULL;
1179 /* |cookie| will only be initialized for DTLS. */
1180 PACKET session_id, compression, extensions, cookie;
1181 static const unsigned char null_compression = 0;
1182 CLIENTHELLO_MSG clienthello;
1184 /* Check if this is actually an unexpected renegotiation ClientHello */
1185 if (s->renegotiate == 0 && !SSL_IS_FIRST_HANDSHAKE(s)) {
1190 /* This is a real handshake so make sure we clean it up at the end */
1191 s->statem.cleanuphand = 1;
1194 * First, parse the raw ClientHello data into the CLIENTHELLO_MSG structure.
1196 memset(&clienthello, 0, sizeof(clienthello));
1197 clienthello.isv2 = RECORD_LAYER_is_sslv2_record(&s->rlayer);
1198 PACKET_null_init(&cookie);
1200 if (clienthello.isv2) {
1204 * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
1205 * header is sent directly on the wire, not wrapped as a TLS
1206 * record. Our record layer just processes the message length and passes
1207 * the rest right through. Its format is:
1209 * 0-1 msg_length - decoded by the record layer
1210 * 2 msg_type - s->init_msg points here
1212 * 5-6 cipher_spec_length
1213 * 7-8 session_id_length
1214 * 9-10 challenge_length
1218 if (!PACKET_get_1(pkt, &mt)
1219 || mt != SSL2_MT_CLIENT_HELLO) {
1221 * Should never happen. We should have tested this in the record
1222 * layer in order to have determined that this is a SSLv2 record
1223 * in the first place
1225 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
1230 if (!PACKET_get_net_2(pkt, &clienthello.legacy_version)) {
1231 al = SSL_AD_DECODE_ERROR;
1232 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
1236 /* Parse the message and load client random. */
1237 if (clienthello.isv2) {
1239 * Handle an SSLv2 backwards compatible ClientHello
1240 * Note, this is only for SSLv3+ using the backward compatible format.
1241 * Real SSLv2 is not supported, and is rejected below.
1243 unsigned int ciphersuite_len, session_id_len, challenge_len;
1246 if (!PACKET_get_net_2(pkt, &ciphersuite_len)
1247 || !PACKET_get_net_2(pkt, &session_id_len)
1248 || !PACKET_get_net_2(pkt, &challenge_len)) {
1249 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1250 SSL_R_RECORD_LENGTH_MISMATCH);
1251 al = SSL_AD_DECODE_ERROR;
1255 if (session_id_len > SSL_MAX_SSL_SESSION_ID_LENGTH) {
1256 al = SSL_AD_DECODE_ERROR;
1257 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1261 if (!PACKET_get_sub_packet(pkt, &clienthello.ciphersuites,
1263 || !PACKET_copy_bytes(pkt, clienthello.session_id, session_id_len)
1264 || !PACKET_get_sub_packet(pkt, &challenge, challenge_len)
1265 /* No extensions. */
1266 || PACKET_remaining(pkt) != 0) {
1267 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1268 SSL_R_RECORD_LENGTH_MISMATCH);
1269 al = SSL_AD_DECODE_ERROR;
1272 clienthello.session_id_len = session_id_len;
1274 /* Load the client random and compression list. We use SSL3_RANDOM_SIZE
1275 * here rather than sizeof(clienthello.random) because that is the limit
1276 * for SSLv3 and it is fixed. It won't change even if
1277 * sizeof(clienthello.random) does.
1279 challenge_len = challenge_len > SSL3_RANDOM_SIZE
1280 ? SSL3_RANDOM_SIZE : challenge_len;
1281 memset(clienthello.random, 0, SSL3_RANDOM_SIZE);
1282 if (!PACKET_copy_bytes(&challenge,
1283 clienthello.random + SSL3_RANDOM_SIZE -
1284 challenge_len, challenge_len)
1285 /* Advertise only null compression. */
1286 || !PACKET_buf_init(&compression, &null_compression, 1)) {
1287 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
1288 al = SSL_AD_INTERNAL_ERROR;
1292 PACKET_null_init(&clienthello.extensions);
1294 /* Regular ClientHello. */
1295 if (!PACKET_copy_bytes(pkt, clienthello.random, SSL3_RANDOM_SIZE)
1296 || !PACKET_get_length_prefixed_1(pkt, &session_id)
1297 || !PACKET_copy_all(&session_id, clienthello.session_id,
1298 SSL_MAX_SSL_SESSION_ID_LENGTH,
1299 &clienthello.session_id_len)) {
1300 al = SSL_AD_DECODE_ERROR;
1301 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1305 if (SSL_IS_DTLS(s)) {
1306 if (!PACKET_get_length_prefixed_1(pkt, &cookie)) {
1307 al = SSL_AD_DECODE_ERROR;
1308 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1311 if (!PACKET_copy_all(&cookie, clienthello.dtls_cookie,
1312 DTLS1_COOKIE_LENGTH,
1313 &clienthello.dtls_cookie_len)) {
1314 al = SSL_AD_DECODE_ERROR;
1315 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1319 * If we require cookies and this ClientHello doesn't contain one,
1320 * just return since we do not want to allocate any memory yet.
1321 * So check cookie length...
1323 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
1324 if (clienthello.dtls_cookie_len == 0)
1329 if (!PACKET_get_length_prefixed_2(pkt, &clienthello.ciphersuites)) {
1330 al = SSL_AD_DECODE_ERROR;
1331 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1335 if (!PACKET_get_length_prefixed_1(pkt, &compression)) {
1336 al = SSL_AD_DECODE_ERROR;
1337 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1341 /* Could be empty. */
1342 if (PACKET_remaining(pkt) == 0) {
1343 PACKET_null_init(&clienthello.extensions);
1345 if (!PACKET_get_length_prefixed_2(pkt, &clienthello.extensions)) {
1346 al = SSL_AD_DECODE_ERROR;
1347 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1353 if (!PACKET_copy_all(&compression, clienthello.compressions,
1354 MAX_COMPRESSIONS_SIZE,
1355 &clienthello.compressions_len)) {
1356 al = SSL_AD_DECODE_ERROR;
1357 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1361 /* Preserve the raw extensions PACKET for later use */
1362 extensions = clienthello.extensions;
1363 if (!tls_collect_extensions(s, &extensions, EXT_CLIENT_HELLO,
1364 &clienthello.pre_proc_exts, &al)) {
1365 /* SSLerr already been called */
1369 /* Finished parsing the ClientHello, now we can start processing it */
1371 /* Set up the client_random */
1372 memcpy(s->s3->client_random, clienthello.random, SSL3_RANDOM_SIZE);
1374 /* Choose the version */
1376 if (clienthello.isv2) {
1377 if (clienthello.legacy_version == SSL2_VERSION
1378 || (clienthello.legacy_version & 0xff00)
1379 != (SSL3_VERSION_MAJOR << 8)) {
1381 * This is real SSLv2 or something complete unknown. We don't
1384 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
1388 s->client_version = clienthello.legacy_version;
1391 * Do SSL/TLS version negotiation if applicable. For DTLS we just check
1392 * versions are potentially compatible. Version negotiation comes later.
1394 if (!SSL_IS_DTLS(s)) {
1395 protverr = ssl_choose_server_version(s, &clienthello);
1396 } else if (s->method->version != DTLS_ANY_VERSION &&
1397 DTLS_VERSION_LT((int)clienthello.legacy_version, s->version)) {
1398 protverr = SSL_R_VERSION_TOO_LOW;
1404 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr);
1405 if ((!s->enc_write_ctx && !s->write_hash)) {
1406 /* like ssl3_get_record, send alert using remote version number */
1407 s->version = s->client_version = clienthello.legacy_version;
1409 al = SSL_AD_PROTOCOL_VERSION;
1413 if (SSL_IS_DTLS(s)) {
1414 /* Empty cookie was already handled above by returning early. */
1415 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
1416 if (s->ctx->app_verify_cookie_cb != NULL) {
1417 if (s->ctx->app_verify_cookie_cb(s, clienthello.dtls_cookie,
1418 clienthello.dtls_cookie_len) == 0) {
1419 al = SSL_AD_HANDSHAKE_FAILURE;
1420 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1421 SSL_R_COOKIE_MISMATCH);
1423 /* else cookie verification succeeded */
1425 /* default verification */
1426 } else if (s->d1->cookie_len != clienthello.dtls_cookie_len
1427 || memcmp(clienthello.dtls_cookie, s->d1->cookie,
1428 s->d1->cookie_len) != 0) {
1429 al = SSL_AD_HANDSHAKE_FAILURE;
1430 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1433 s->d1->cookie_verified = 1;
1435 if (s->method->version == DTLS_ANY_VERSION) {
1436 protverr = ssl_choose_server_version(s, &clienthello);
1437 if (protverr != 0) {
1438 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr);
1439 s->version = s->client_version;
1440 al = SSL_AD_PROTOCOL_VERSION;
1448 /* We need to do this before getting the session */
1449 if (!tls_parse_extension(s, TLSEXT_IDX_extended_master_secret,
1451 clienthello.pre_proc_exts, NULL, 0, &al)) {
1452 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1457 * We don't allow resumption in a backwards compatible ClientHello.
1458 * TODO(openssl-team): in TLS1.1+, session_id MUST be empty.
1460 * Versions before 0.9.7 always allow clients to resume sessions in
1461 * renegotiation. 0.9.7 and later allow this by default, but optionally
1462 * ignore resumption requests with flag
1463 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1464 * than a change to default behavior so that applications relying on
1465 * this for security won't even compile against older library versions).
1466 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to
1467 * request renegotiation but not a new session (s->new_session remains
1468 * unset): for servers, this essentially just means that the
1469 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be
1472 if (clienthello.isv2 ||
1474 (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) {
1475 if (!ssl_get_new_session(s, 1))
1478 i = ssl_get_prev_session(s, &clienthello, &al);
1480 /* previous session */
1482 } else if (i == -1) {
1486 if (!ssl_get_new_session(s, 1))
1491 if (ssl_bytes_to_cipher_list(s, &clienthello.ciphersuites, &ciphers,
1492 clienthello.isv2, &al) == NULL) {
1496 /* If it is a hit, check that the cipher is in the list */
1499 id = s->session->cipher->id;
1502 fprintf(stderr, "client sent %d ciphers\n", sk_SSL_CIPHER_num(ciphers));
1504 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
1505 c = sk_SSL_CIPHER_value(ciphers, i);
1507 fprintf(stderr, "client [%2d of %2d]:%s\n",
1508 i, sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c));
1517 * we need to have the cipher in the cipher list if we are asked
1520 al = SSL_AD_ILLEGAL_PARAMETER;
1521 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1522 SSL_R_REQUIRED_CIPHER_MISSING);
1527 for (loop = 0; loop < clienthello.compressions_len; loop++) {
1528 if (clienthello.compressions[loop] == 0)
1532 if (loop >= clienthello.compressions_len) {
1534 al = SSL_AD_DECODE_ERROR;
1535 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_COMPRESSION_SPECIFIED);
1539 #ifndef OPENSSL_NO_EC
1540 if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
1541 ssl_check_for_safari(s, &clienthello);
1542 #endif /* !OPENSSL_NO_EC */
1544 /* TLS extensions */
1545 if (!tls_parse_all_extensions(s, EXT_CLIENT_HELLO,
1546 clienthello.pre_proc_exts, NULL, 0, &al)) {
1547 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_PARSE_TLSEXT);
1552 * Check if we want to use external pre-shared secret for this handshake
1553 * for not reused session only. We need to generate server_random before
1554 * calling tls_session_secret_cb in order to allow SessionTicket
1555 * processing to use it in key derivation.
1559 pos = s->s3->server_random;
1560 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0) {
1565 if (!s->hit && s->version >= TLS1_VERSION && s->ext.session_secret_cb) {
1566 const SSL_CIPHER *pref_cipher = NULL;
1568 * s->session->master_key_length is a size_t, but this is an int for
1569 * backwards compat reasons
1571 int master_key_length;
1573 master_key_length = sizeof(s->session->master_key);
1574 if (s->ext.session_secret_cb(s, s->session->master_key,
1575 &master_key_length, ciphers,
1577 s->ext.session_secret_cb_arg)
1578 && master_key_length > 0) {
1579 s->session->master_key_length = master_key_length;
1581 s->session->ciphers = ciphers;
1582 s->session->verify_result = X509_V_OK;
1586 /* check if some cipher was preferred by call back */
1587 if (pref_cipher == NULL)
1588 pref_cipher = ssl3_choose_cipher(s, s->session->ciphers,
1589 SSL_get_ciphers(s));
1590 if (pref_cipher == NULL) {
1591 al = SSL_AD_HANDSHAKE_FAILURE;
1592 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER);
1596 s->session->cipher = pref_cipher;
1597 sk_SSL_CIPHER_free(s->cipher_list);
1598 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1599 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1600 s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1605 * Worst case, we will use the NULL compression, but if we have other
1606 * options, we will now look for them. We have complen-1 compression
1607 * algorithms from the client, starting at q.
1609 s->s3->tmp.new_compression = NULL;
1610 #ifndef OPENSSL_NO_COMP
1611 /* This only happens if we have a cache hit */
1612 if (s->session->compress_meth != 0) {
1613 int m, comp_id = s->session->compress_meth;
1615 /* Perform sanity checks on resumed compression algorithm */
1616 /* Can't disable compression */
1617 if (!ssl_allow_compression(s)) {
1618 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1619 SSL_R_INCONSISTENT_COMPRESSION);
1622 /* Look for resumed compression method */
1623 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) {
1624 comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
1625 if (comp_id == comp->id) {
1626 s->s3->tmp.new_compression = comp;
1630 if (s->s3->tmp.new_compression == NULL) {
1631 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1632 SSL_R_INVALID_COMPRESSION_ALGORITHM);
1635 /* Look for resumed method in compression list */
1636 for (k = 0; k < clienthello.compressions_len; k++) {
1637 if (clienthello.compressions[k] == comp_id)
1640 if (k >= clienthello.compressions_len) {
1641 al = SSL_AD_ILLEGAL_PARAMETER;
1642 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1643 SSL_R_REQUIRED_COMPRESSION_ALGORITHM_MISSING);
1648 else if (ssl_allow_compression(s) && s->ctx->comp_methods) {
1649 /* See if we have a match */
1650 int m, nn, v, done = 0;
1653 nn = sk_SSL_COMP_num(s->ctx->comp_methods);
1654 for (m = 0; m < nn; m++) {
1655 comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
1657 for (o = 0; o < clienthello.compressions_len; o++) {
1658 if (v == clienthello.compressions[o]) {
1667 s->s3->tmp.new_compression = comp;
1673 * If compression is disabled we'd better not try to resume a session
1674 * using compression.
1676 if (s->session->compress_meth != 0) {
1677 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_INCONSISTENT_COMPRESSION);
1683 * Given s->session->ciphers and SSL_get_ciphers, we must pick a cipher
1687 #ifdef OPENSSL_NO_COMP
1688 s->session->compress_meth = 0;
1690 s->session->compress_meth = (comp == NULL) ? 0 : comp->id;
1692 sk_SSL_CIPHER_free(s->session->ciphers);
1693 s->session->ciphers = ciphers;
1694 if (ciphers == NULL) {
1695 al = SSL_AD_INTERNAL_ERROR;
1696 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
1700 if (!tls1_set_server_sigalgs(s)) {
1701 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1706 sk_SSL_CIPHER_free(ciphers);
1707 OPENSSL_free(clienthello.pre_proc_exts);
1708 return MSG_PROCESS_CONTINUE_PROCESSING;
1710 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1712 ossl_statem_set_error(s);
1714 sk_SSL_CIPHER_free(ciphers);
1715 OPENSSL_free(clienthello.pre_proc_exts);
1717 return MSG_PROCESS_ERROR;
1721 * Call the status request callback if needed. Upon success, returns 1.
1722 * Upon failure, returns 0 and sets |*al| to the appropriate fatal alert.
1724 static int tls_handle_status_request(SSL *s, int *al)
1726 s->ext.status_expected = 0;
1729 * If status request then ask callback what to do. Note: this must be
1730 * called after servername callbacks in case the certificate has changed,
1731 * and must be called after the cipher has been chosen because this may
1732 * influence which certificate is sent
1734 if (s->ext.status_type != TLSEXT_STATUSTYPE_nothing && s->ctx != NULL
1735 && s->ctx->ext.status_cb != NULL) {
1737 CERT_PKEY *certpkey = ssl_get_server_send_pkey(s);
1739 /* If no certificate can't return certificate status */
1740 if (certpkey != NULL) {
1742 * Set current certificate to one we will use so SSL_get_certificate
1743 * et al can pick it up.
1745 s->cert->key = certpkey;
1746 ret = s->ctx->ext.status_cb(s, s->ctx->ext.status_arg);
1748 /* We don't want to send a status request response */
1749 case SSL_TLSEXT_ERR_NOACK:
1750 s->ext.status_expected = 0;
1752 /* status request response should be sent */
1753 case SSL_TLSEXT_ERR_OK:
1754 if (s->ext.ocsp.resp)
1755 s->ext.status_expected = 1;
1757 /* something bad happened */
1758 case SSL_TLSEXT_ERR_ALERT_FATAL:
1760 *al = SSL_AD_INTERNAL_ERROR;
1769 WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst)
1771 int al = SSL_AD_HANDSHAKE_FAILURE;
1772 const SSL_CIPHER *cipher;
1774 if (wst == WORK_MORE_A) {
1776 /* Let cert callback update server certificates if required */
1777 if (s->cert->cert_cb) {
1778 int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
1780 al = SSL_AD_INTERNAL_ERROR;
1781 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1782 SSL_R_CERT_CB_ERROR);
1786 s->rwstate = SSL_X509_LOOKUP;
1789 s->rwstate = SSL_NOTHING;
1792 ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1794 if (cipher == NULL) {
1795 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1796 SSL_R_NO_SHARED_CIPHER);
1799 s->s3->tmp.new_cipher = cipher;
1800 /* check whether we should disable session resumption */
1801 if (s->not_resumable_session_cb != NULL)
1802 s->session->not_resumable =
1803 s->not_resumable_session_cb(s, ((cipher->algorithm_mkey
1804 & (SSL_kDHE | SSL_kECDHE))
1806 if (s->session->not_resumable)
1807 /* do not send a session ticket */
1808 s->ext.ticket_expected = 0;
1810 /* Session-id reuse */
1811 s->s3->tmp.new_cipher = s->session->cipher;
1814 if (!(s->verify_mode & SSL_VERIFY_PEER)) {
1815 if (!ssl3_digest_cached_records(s, 0)) {
1816 al = SSL_AD_INTERNAL_ERROR;
1822 * we now have the following setup.
1824 * cipher_list - our preferred list of ciphers
1825 * ciphers - the clients preferred list of ciphers
1826 * compression - basically ignored right now
1827 * ssl version is set - sslv3
1828 * s->session - The ssl session has been setup.
1829 * s->hit - session reuse flag
1830 * s->s3->tmp.new_cipher- the new cipher to use.
1834 * Call status_request callback if needed. Has to be done after the
1835 * certificate callbacks etc above.
1837 if (!tls_handle_status_request(s, &al)) {
1838 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1839 SSL_R_CLIENTHELLO_TLSEXT);
1845 #ifndef OPENSSL_NO_SRP
1846 if (wst == WORK_MORE_B) {
1848 if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) {
1850 * callback indicates further work to be done
1852 s->rwstate = SSL_X509_LOOKUP;
1855 if (ret != SSL_ERROR_NONE) {
1857 * This is not really an error but the only means to for
1858 * a client to detect whether srp is supported.
1860 if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
1861 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1862 SSL_R_CLIENTHELLO_TLSEXT);
1864 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1865 SSL_R_PSK_IDENTITY_NOT_FOUND);
1871 return WORK_FINISHED_STOP;
1873 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1874 ossl_statem_set_error(s);
1878 int tls_construct_server_hello(SSL *s, WPACKET *pkt)
1880 int compm, al = SSL_AD_INTERNAL_ERROR;
1884 /* TODO(TLS1.3): Remove the DRAFT conditional before release */
1885 version = SSL_IS_TLS13(s) ? TLS1_3_VERSION_DRAFT : s->version;
1886 if (!WPACKET_put_bytes_u16(pkt, version)
1888 * Random stuff. Filling of the server_random takes place in
1889 * tls_process_client_hello()
1891 || !WPACKET_memcpy(pkt, s->s3->server_random, SSL3_RANDOM_SIZE)) {
1892 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1897 * There are several cases for the session ID to send
1898 * back in the server hello:
1899 * - For session reuse from the session cache,
1900 * we send back the old session ID.
1901 * - If stateless session reuse (using a session ticket)
1902 * is successful, we send back the client's "session ID"
1903 * (which doesn't actually identify the session).
1904 * - If it is a new session, we send back the new
1906 * - However, if we want the new session to be single-use,
1907 * we send back a 0-length session ID.
1908 * s->hit is non-zero in either case of session reuse,
1909 * so the following won't overwrite an ID that we're supposed
1912 if (s->session->not_resumable ||
1913 (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1915 s->session->session_id_length = 0;
1917 sl = s->session->session_id_length;
1918 if (sl > sizeof(s->session->session_id)) {
1919 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1923 /* set up the compression method */
1924 #ifdef OPENSSL_NO_COMP
1927 if (s->s3->tmp.new_compression == NULL)
1930 compm = s->s3->tmp.new_compression->id;
1933 if ((!SSL_IS_TLS13(s)
1934 && !WPACKET_sub_memcpy_u8(pkt, s->session->session_id, sl))
1935 || !s->method->put_cipher_by_char(s->s3->tmp.new_cipher, pkt, &len)
1936 || (!SSL_IS_TLS13(s)
1937 && !WPACKET_put_bytes_u8(pkt, compm))
1938 || !tls_construct_extensions(s, pkt,
1940 ? EXT_TLS1_3_SERVER_HELLO
1941 : EXT_TLS1_2_SERVER_HELLO,
1943 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1949 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1953 int tls_construct_server_done(SSL *s, WPACKET *pkt)
1955 if (!s->s3->tmp.cert_request) {
1956 if (!ssl3_digest_cached_records(s, 0)) {
1957 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
1964 int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt)
1966 #ifndef OPENSSL_NO_DH
1967 EVP_PKEY *pkdh = NULL;
1969 #ifndef OPENSSL_NO_EC
1970 unsigned char *encodedPoint = NULL;
1971 size_t encodedlen = 0;
1975 const EVP_MD *md = NULL;
1976 int al = SSL_AD_INTERNAL_ERROR, i;
1979 EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
1980 EVP_PKEY_CTX *pctx = NULL;
1981 size_t paramlen, paramoffset;
1983 if (!WPACKET_get_total_written(pkt, ¶moffset)) {
1984 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1988 if (md_ctx == NULL) {
1989 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1993 type = s->s3->tmp.new_cipher->algorithm_mkey;
1995 r[0] = r[1] = r[2] = r[3] = NULL;
1996 #ifndef OPENSSL_NO_PSK
1997 /* Plain PSK or RSAPSK nothing to do */
1998 if (type & (SSL_kPSK | SSL_kRSAPSK)) {
2000 #endif /* !OPENSSL_NO_PSK */
2001 #ifndef OPENSSL_NO_DH
2002 if (type & (SSL_kDHE | SSL_kDHEPSK)) {
2003 CERT *cert = s->cert;
2005 EVP_PKEY *pkdhp = NULL;
2008 if (s->cert->dh_tmp_auto) {
2009 DH *dhp = ssl_get_auto_dh(s);
2010 pkdh = EVP_PKEY_new();
2011 if (pkdh == NULL || dhp == NULL) {
2013 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2014 ERR_R_INTERNAL_ERROR);
2017 EVP_PKEY_assign_DH(pkdh, dhp);
2020 pkdhp = cert->dh_tmp;
2022 if ((pkdhp == NULL) && (s->cert->dh_tmp_cb != NULL)) {
2023 DH *dhp = s->cert->dh_tmp_cb(s, 0, 1024);
2024 pkdh = ssl_dh_to_pkey(dhp);
2026 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2027 ERR_R_INTERNAL_ERROR);
2032 if (pkdhp == NULL) {
2033 al = SSL_AD_HANDSHAKE_FAILURE;
2034 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2035 SSL_R_MISSING_TMP_DH_KEY);
2038 if (!ssl_security(s, SSL_SECOP_TMP_DH,
2039 EVP_PKEY_security_bits(pkdhp), 0, pkdhp)) {
2040 al = SSL_AD_HANDSHAKE_FAILURE;
2041 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2042 SSL_R_DH_KEY_TOO_SMALL);
2045 if (s->s3->tmp.pkey != NULL) {
2046 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2047 ERR_R_INTERNAL_ERROR);
2051 s->s3->tmp.pkey = ssl_generate_pkey(pkdhp);
2053 if (s->s3->tmp.pkey == NULL) {
2054 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB);
2058 dh = EVP_PKEY_get0_DH(s->s3->tmp.pkey);
2060 EVP_PKEY_free(pkdh);
2063 DH_get0_pqg(dh, &r[0], NULL, &r[1]);
2064 DH_get0_key(dh, &r[2], NULL);
2067 #ifndef OPENSSL_NO_EC
2068 if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
2071 if (s->s3->tmp.pkey != NULL) {
2072 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2073 ERR_R_INTERNAL_ERROR);
2077 /* Get NID of appropriate shared curve */
2078 nid = tls1_shared_group(s, -2);
2079 curve_id = tls1_ec_nid2curve_id(nid);
2080 if (curve_id == 0) {
2081 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2082 SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
2085 s->s3->tmp.pkey = ssl_generate_pkey_curve(curve_id);
2086 /* Generate a new key for this curve */
2087 if (s->s3->tmp.pkey == NULL) {
2088 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB);
2092 /* Encode the public key. */
2093 encodedlen = EVP_PKEY_get1_tls_encodedpoint(s->s3->tmp.pkey,
2095 if (encodedlen == 0) {
2096 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EC_LIB);
2101 * We'll generate the serverKeyExchange message explicitly so we
2102 * can set these to NULLs
2109 #endif /* !OPENSSL_NO_EC */
2110 #ifndef OPENSSL_NO_SRP
2111 if (type & SSL_kSRP) {
2112 if ((s->srp_ctx.N == NULL) ||
2113 (s->srp_ctx.g == NULL) ||
2114 (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) {
2115 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2116 SSL_R_MISSING_SRP_PARAM);
2119 r[0] = s->srp_ctx.N;
2120 r[1] = s->srp_ctx.g;
2121 r[2] = s->srp_ctx.s;
2122 r[3] = s->srp_ctx.B;
2126 al = SSL_AD_HANDSHAKE_FAILURE;
2127 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2128 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2132 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP))
2133 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) {
2134 if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, &md))
2136 al = SSL_AD_DECODE_ERROR;
2143 #ifndef OPENSSL_NO_PSK
2144 if (type & SSL_PSK) {
2145 size_t len = (s->cert->psk_identity_hint == NULL)
2146 ? 0 : strlen(s->cert->psk_identity_hint);
2149 * It should not happen that len > PSK_MAX_IDENTITY_LEN - we already
2150 * checked this when we set the identity hint - but just in case
2152 if (len > PSK_MAX_IDENTITY_LEN
2153 || !WPACKET_sub_memcpy_u16(pkt, s->cert->psk_identity_hint,
2155 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2156 ERR_R_INTERNAL_ERROR);
2162 for (i = 0; i < 4 && r[i] != NULL; i++) {
2163 unsigned char *binval;
2166 #ifndef OPENSSL_NO_SRP
2167 if ((i == 2) && (type & SSL_kSRP)) {
2168 res = WPACKET_start_sub_packet_u8(pkt);
2171 res = WPACKET_start_sub_packet_u16(pkt);
2174 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2175 ERR_R_INTERNAL_ERROR);
2179 #ifndef OPENSSL_NO_DH
2181 * for interoperability with some versions of the Microsoft TLS
2182 * stack, we need to zero pad the DHE pub key to the same length
2185 if ((i == 2) && (type & (SSL_kDHE | SSL_kDHEPSK))) {
2186 size_t len = BN_num_bytes(r[0]) - BN_num_bytes(r[2]);
2189 if (!WPACKET_allocate_bytes(pkt, len, &binval)) {
2190 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2191 ERR_R_INTERNAL_ERROR);
2194 memset(binval, 0, len);
2198 if (!WPACKET_allocate_bytes(pkt, BN_num_bytes(r[i]), &binval)
2199 || !WPACKET_close(pkt)) {
2200 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2201 ERR_R_INTERNAL_ERROR);
2205 BN_bn2bin(r[i], binval);
2208 #ifndef OPENSSL_NO_EC
2209 if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
2211 * We only support named (not generic) curves. In this situation, the
2212 * ServerKeyExchange message has: [1 byte CurveType], [2 byte CurveName]
2213 * [1 byte length of encoded point], followed by the actual encoded
2216 if (!WPACKET_put_bytes_u8(pkt, NAMED_CURVE_TYPE)
2217 || !WPACKET_put_bytes_u8(pkt, 0)
2218 || !WPACKET_put_bytes_u8(pkt, curve_id)
2219 || !WPACKET_sub_memcpy_u8(pkt, encodedPoint, encodedlen)) {
2220 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2221 ERR_R_INTERNAL_ERROR);
2224 OPENSSL_free(encodedPoint);
2225 encodedPoint = NULL;
2232 * n is the length of the params, they start at &(d[4]) and p
2233 * points to the space at the end.
2236 unsigned char *sigbytes1, *sigbytes2;
2240 /* Get length of the parameters we have written above */
2241 if (!WPACKET_get_length(pkt, ¶mlen)) {
2242 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2243 ERR_R_INTERNAL_ERROR);
2246 /* send signature algorithm */
2247 if (SSL_USE_SIGALGS(s)) {
2248 if (!tls12_get_sigandhash(s, pkt, pkey, md, &ispss)) {
2249 /* Should never happen */
2250 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2251 ERR_R_INTERNAL_ERROR);
2256 fprintf(stderr, "Using hash %s\n", EVP_MD_name(md));
2259 * Create the signature. We don't know the actual length of the sig
2260 * until after we've created it, so we reserve enough bytes for it
2261 * up front, and then properly allocate them in the WPACKET
2264 siglen = EVP_PKEY_size(pkey);
2265 if (!WPACKET_sub_reserve_bytes_u16(pkt, siglen, &sigbytes1)
2266 || EVP_DigestSignInit(md_ctx, &pctx, md, NULL, pkey) <= 0) {
2267 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2268 ERR_R_INTERNAL_ERROR);
2272 if (EVP_PKEY_CTX_set_rsa_padding(pctx,
2273 RSA_PKCS1_PSS_PADDING) <= 0
2274 || EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, RSA_PSS_SALTLEN_DIGEST) <= 0) {
2275 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2280 if (EVP_DigestSignUpdate(md_ctx, &(s->s3->client_random[0]),
2281 SSL3_RANDOM_SIZE) <= 0
2282 || EVP_DigestSignUpdate(md_ctx, &(s->s3->server_random[0]),
2283 SSL3_RANDOM_SIZE) <= 0
2284 || EVP_DigestSignUpdate(md_ctx,
2285 s->init_buf->data + paramoffset,
2287 || EVP_DigestSignFinal(md_ctx, sigbytes1, &siglen) <= 0
2288 || !WPACKET_sub_allocate_bytes_u16(pkt, siglen, &sigbytes2)
2289 || sigbytes1 != sigbytes2) {
2290 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2291 ERR_R_INTERNAL_ERROR);
2295 /* Is this error check actually needed? */
2296 al = SSL_AD_HANDSHAKE_FAILURE;
2297 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
2298 SSL_R_UNKNOWN_PKEY_TYPE);
2303 EVP_MD_CTX_free(md_ctx);
2306 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2308 #ifndef OPENSSL_NO_DH
2309 EVP_PKEY_free(pkdh);
2311 #ifndef OPENSSL_NO_EC
2312 OPENSSL_free(encodedPoint);
2314 EVP_MD_CTX_free(md_ctx);
2318 int tls_construct_certificate_request(SSL *s, WPACKET *pkt)
2321 STACK_OF(X509_NAME) *sk = NULL;
2323 /* get the list of acceptable cert types */
2324 if (!WPACKET_start_sub_packet_u8(pkt)
2325 || !ssl3_get_req_cert_type(s, pkt)
2326 || !WPACKET_close(pkt)) {
2327 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);
2331 if (SSL_USE_SIGALGS(s)) {
2332 const uint16_t *psigs;
2333 size_t nl = tls12_get_psigalgs(s, 1, &psigs);
2335 if (!WPACKET_start_sub_packet_u16(pkt)
2336 || !tls12_copy_sigalgs(s, pkt, psigs, nl)
2337 || !WPACKET_close(pkt)) {
2338 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,
2339 ERR_R_INTERNAL_ERROR);
2344 /* Start sub-packet for client CA list */
2345 if (!WPACKET_start_sub_packet_u16(pkt)) {
2346 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);
2350 sk = SSL_get_client_CA_list(s);
2352 for (i = 0; i < sk_X509_NAME_num(sk); i++) {
2353 unsigned char *namebytes;
2354 X509_NAME *name = sk_X509_NAME_value(sk, i);
2358 || (namelen = i2d_X509_NAME(name, NULL)) < 0
2359 || !WPACKET_sub_allocate_bytes_u16(pkt, namelen,
2361 || i2d_X509_NAME(name, &namebytes) != namelen) {
2362 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,
2363 ERR_R_INTERNAL_ERROR);
2368 /* else no CA names */
2370 if (!WPACKET_close(pkt)) {
2371 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);
2375 s->s3->tmp.cert_request = 1;
2379 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2383 static int tls_process_cke_psk_preamble(SSL *s, PACKET *pkt, int *al)
2385 #ifndef OPENSSL_NO_PSK
2386 unsigned char psk[PSK_MAX_PSK_LEN];
2388 PACKET psk_identity;
2390 if (!PACKET_get_length_prefixed_2(pkt, &psk_identity)) {
2391 *al = SSL_AD_DECODE_ERROR;
2392 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_LENGTH_MISMATCH);
2395 if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) {
2396 *al = SSL_AD_DECODE_ERROR;
2397 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_DATA_LENGTH_TOO_LONG);
2400 if (s->psk_server_callback == NULL) {
2401 *al = SSL_AD_INTERNAL_ERROR;
2402 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_PSK_NO_SERVER_CB);
2406 if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) {
2407 *al = SSL_AD_INTERNAL_ERROR;
2408 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
2412 psklen = s->psk_server_callback(s, s->session->psk_identity,
2415 if (psklen > PSK_MAX_PSK_LEN) {
2416 *al = SSL_AD_INTERNAL_ERROR;
2417 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
2419 } else if (psklen == 0) {
2421 * PSK related to the given identity not found
2423 *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
2424 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
2425 SSL_R_PSK_IDENTITY_NOT_FOUND);
2429 OPENSSL_free(s->s3->tmp.psk);
2430 s->s3->tmp.psk = OPENSSL_memdup(psk, psklen);
2431 OPENSSL_cleanse(psk, psklen);
2433 if (s->s3->tmp.psk == NULL) {
2434 *al = SSL_AD_INTERNAL_ERROR;
2435 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_MALLOC_FAILURE);
2439 s->s3->tmp.psklen = psklen;
2443 /* Should never happen */
2444 *al = SSL_AD_INTERNAL_ERROR;
2445 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
2450 static int tls_process_cke_rsa(SSL *s, PACKET *pkt, int *al)
2452 #ifndef OPENSSL_NO_RSA
2453 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2455 unsigned char decrypt_good, version_good;
2456 size_t j, padding_len;
2457 PACKET enc_premaster;
2459 unsigned char *rsa_decrypt = NULL;
2462 rsa = EVP_PKEY_get0_RSA(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey);
2464 *al = SSL_AD_HANDSHAKE_FAILURE;
2465 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_MISSING_RSA_CERTIFICATE);
2469 /* SSLv3 and pre-standard DTLS omit the length bytes. */
2470 if (s->version == SSL3_VERSION || s->version == DTLS1_BAD_VER) {
2471 enc_premaster = *pkt;
2473 if (!PACKET_get_length_prefixed_2(pkt, &enc_premaster)
2474 || PACKET_remaining(pkt) != 0) {
2475 *al = SSL_AD_DECODE_ERROR;
2476 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_LENGTH_MISMATCH);
2482 * We want to be sure that the plaintext buffer size makes it safe to
2483 * iterate over the entire size of a premaster secret
2484 * (SSL_MAX_MASTER_KEY_LENGTH). Reject overly short RSA keys because
2485 * their ciphertext cannot accommodate a premaster secret anyway.
2487 if (RSA_size(rsa) < SSL_MAX_MASTER_KEY_LENGTH) {
2488 *al = SSL_AD_INTERNAL_ERROR;
2489 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, RSA_R_KEY_SIZE_TOO_SMALL);
2493 rsa_decrypt = OPENSSL_malloc(RSA_size(rsa));
2494 if (rsa_decrypt == NULL) {
2495 *al = SSL_AD_INTERNAL_ERROR;
2496 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_MALLOC_FAILURE);
2501 * We must not leak whether a decryption failure occurs because of
2502 * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246,
2503 * section 7.4.7.1). The code follows that advice of the TLS RFC and
2504 * generates a random premaster secret for the case that the decrypt
2505 * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1
2508 if (RAND_bytes(rand_premaster_secret, sizeof(rand_premaster_secret)) <= 0)
2512 * Decrypt with no padding. PKCS#1 padding will be removed as part of
2513 * the timing-sensitive code below.
2515 /* TODO(size_t): Convert this function */
2516 decrypt_len = (int)RSA_private_decrypt((int)PACKET_remaining(&enc_premaster),
2517 PACKET_data(&enc_premaster),
2518 rsa_decrypt, rsa, RSA_NO_PADDING);
2519 if (decrypt_len < 0)
2522 /* Check the padding. See RFC 3447, section 7.2.2. */
2525 * The smallest padded premaster is 11 bytes of overhead. Small keys
2526 * are publicly invalid, so this may return immediately. This ensures
2527 * PS is at least 8 bytes.
2529 if (decrypt_len < 11 + SSL_MAX_MASTER_KEY_LENGTH) {
2530 *al = SSL_AD_DECRYPT_ERROR;
2531 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_DECRYPTION_FAILED);
2535 padding_len = decrypt_len - SSL_MAX_MASTER_KEY_LENGTH;
2536 decrypt_good = constant_time_eq_int_8(rsa_decrypt[0], 0) &
2537 constant_time_eq_int_8(rsa_decrypt[1], 2);
2538 for (j = 2; j < padding_len - 1; j++) {
2539 decrypt_good &= ~constant_time_is_zero_8(rsa_decrypt[j]);
2541 decrypt_good &= constant_time_is_zero_8(rsa_decrypt[padding_len - 1]);
2544 * If the version in the decrypted pre-master secret is correct then
2545 * version_good will be 0xff, otherwise it'll be zero. The
2546 * Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2547 * (http://eprint.iacr.org/2003/052/) exploits the version number
2548 * check as a "bad version oracle". Thus version checks are done in
2549 * constant time and are treated like any other decryption error.
2552 constant_time_eq_8(rsa_decrypt[padding_len],
2553 (unsigned)(s->client_version >> 8));
2555 constant_time_eq_8(rsa_decrypt[padding_len + 1],
2556 (unsigned)(s->client_version & 0xff));
2559 * The premaster secret must contain the same version number as the
2560 * ClientHello to detect version rollback attacks (strangely, the
2561 * protocol does not offer such protection for DH ciphersuites).
2562 * However, buggy clients exist that send the negotiated protocol
2563 * version instead if the server does not support the requested
2564 * protocol version. If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such
2567 if (s->options & SSL_OP_TLS_ROLLBACK_BUG) {
2568 unsigned char workaround_good;
2569 workaround_good = constant_time_eq_8(rsa_decrypt[padding_len],
2570 (unsigned)(s->version >> 8));
2572 constant_time_eq_8(rsa_decrypt[padding_len + 1],
2573 (unsigned)(s->version & 0xff));
2574 version_good |= workaround_good;
2578 * Both decryption and version must be good for decrypt_good to
2579 * remain non-zero (0xff).
2581 decrypt_good &= version_good;
2584 * Now copy rand_premaster_secret over from p using
2585 * decrypt_good_mask. If decryption failed, then p does not
2586 * contain valid plaintext, however, a check above guarantees
2587 * it is still sufficiently large to read from.
2589 for (j = 0; j < sizeof(rand_premaster_secret); j++) {
2590 rsa_decrypt[padding_len + j] =
2591 constant_time_select_8(decrypt_good,
2592 rsa_decrypt[padding_len + j],
2593 rand_premaster_secret[j]);
2596 if (!ssl_generate_master_secret(s, rsa_decrypt + padding_len,
2597 sizeof(rand_premaster_secret), 0)) {
2598 *al = SSL_AD_INTERNAL_ERROR;
2599 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_INTERNAL_ERROR);
2605 OPENSSL_free(rsa_decrypt);
2608 /* Should never happen */
2609 *al = SSL_AD_INTERNAL_ERROR;
2610 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_INTERNAL_ERROR);
2615 static int tls_process_cke_dhe(SSL *s, PACKET *pkt, int *al)
2617 #ifndef OPENSSL_NO_DH
2618 EVP_PKEY *skey = NULL;
2622 const unsigned char *data;
2623 EVP_PKEY *ckey = NULL;
2626 if (!PACKET_get_net_2(pkt, &i) || PACKET_remaining(pkt) != i) {
2627 *al = SSL_AD_HANDSHAKE_FAILURE;
2628 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE,
2629 SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2632 skey = s->s3->tmp.pkey;
2634 *al = SSL_AD_HANDSHAKE_FAILURE;
2635 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_MISSING_TMP_DH_KEY);
2639 if (PACKET_remaining(pkt) == 0L) {
2640 *al = SSL_AD_HANDSHAKE_FAILURE;
2641 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_MISSING_TMP_DH_KEY);
2644 if (!PACKET_get_bytes(pkt, &data, i)) {
2645 /* We already checked we have enough data */
2646 *al = SSL_AD_INTERNAL_ERROR;
2647 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
2650 ckey = EVP_PKEY_new();
2651 if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) == 0) {
2652 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_BN_LIB);
2655 cdh = EVP_PKEY_get0_DH(ckey);
2656 pub_key = BN_bin2bn(data, i, NULL);
2658 if (pub_key == NULL || !DH_set0_key(cdh, pub_key, NULL)) {
2659 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
2660 if (pub_key != NULL)
2665 if (ssl_derive(s, skey, ckey, 1) == 0) {
2666 *al = SSL_AD_INTERNAL_ERROR;
2667 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
2672 EVP_PKEY_free(s->s3->tmp.pkey);
2673 s->s3->tmp.pkey = NULL;
2675 EVP_PKEY_free(ckey);
2678 /* Should never happen */
2679 *al = SSL_AD_INTERNAL_ERROR;
2680 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
2685 static int tls_process_cke_ecdhe(SSL *s, PACKET *pkt, int *al)
2687 #ifndef OPENSSL_NO_EC
2688 EVP_PKEY *skey = s->s3->tmp.pkey;
2689 EVP_PKEY *ckey = NULL;
2692 if (PACKET_remaining(pkt) == 0L) {
2693 /* We don't support ECDH client auth */
2694 *al = SSL_AD_HANDSHAKE_FAILURE;
2695 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, SSL_R_MISSING_TMP_ECDH_KEY);
2699 const unsigned char *data;
2702 * Get client's public key from encoded point in the
2703 * ClientKeyExchange message.
2706 /* Get encoded point length */
2707 if (!PACKET_get_1(pkt, &i) || !PACKET_get_bytes(pkt, &data, i)
2708 || PACKET_remaining(pkt) != 0) {
2709 *al = SSL_AD_DECODE_ERROR;
2710 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, SSL_R_LENGTH_MISMATCH);
2713 ckey = EVP_PKEY_new();
2714 if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) <= 0) {
2715 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_EVP_LIB);
2718 if (EVP_PKEY_set1_tls_encodedpoint(ckey, data, i) == 0) {
2719 *al = SSL_AD_HANDSHAKE_FAILURE;
2720 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_EC_LIB);
2725 if (ssl_derive(s, skey, ckey, 1) == 0) {
2726 *al = SSL_AD_INTERNAL_ERROR;
2727 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_INTERNAL_ERROR);
2732 EVP_PKEY_free(s->s3->tmp.pkey);
2733 s->s3->tmp.pkey = NULL;
2735 EVP_PKEY_free(ckey);
2739 /* Should never happen */
2740 *al = SSL_AD_INTERNAL_ERROR;
2741 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_INTERNAL_ERROR);
2746 static int tls_process_cke_srp(SSL *s, PACKET *pkt, int *al)
2748 #ifndef OPENSSL_NO_SRP
2750 const unsigned char *data;
2752 if (!PACKET_get_net_2(pkt, &i)
2753 || !PACKET_get_bytes(pkt, &data, i)) {
2754 *al = SSL_AD_DECODE_ERROR;
2755 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, SSL_R_BAD_SRP_A_LENGTH);
2758 if ((s->srp_ctx.A = BN_bin2bn(data, i, NULL)) == NULL) {
2759 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_BN_LIB);
2762 if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0 || BN_is_zero(s->srp_ctx.A)) {
2763 *al = SSL_AD_ILLEGAL_PARAMETER;
2764 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, SSL_R_BAD_SRP_PARAMETERS);
2767 OPENSSL_free(s->session->srp_username);
2768 s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login);
2769 if (s->session->srp_username == NULL) {
2770 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_MALLOC_FAILURE);
2774 if (!srp_generate_server_master_secret(s)) {
2775 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_INTERNAL_ERROR);
2781 /* Should never happen */
2782 *al = SSL_AD_INTERNAL_ERROR;
2783 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_INTERNAL_ERROR);
2788 static int tls_process_cke_gost(SSL *s, PACKET *pkt, int *al)
2790 #ifndef OPENSSL_NO_GOST
2791 EVP_PKEY_CTX *pkey_ctx;
2792 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2793 unsigned char premaster_secret[32];
2794 const unsigned char *start;
2795 size_t outlen = 32, inlen;
2796 unsigned long alg_a;
2799 size_t sess_key_len;
2800 const unsigned char *data;
2803 /* Get our certificate private key */
2804 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2805 if (alg_a & SSL_aGOST12) {
2807 * New GOST ciphersuites have SSL_aGOST01 bit too
2809 pk = s->cert->pkeys[SSL_PKEY_GOST12_512].privatekey;
2811 pk = s->cert->pkeys[SSL_PKEY_GOST12_256].privatekey;
2814 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2816 } else if (alg_a & SSL_aGOST01) {
2817 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2820 pkey_ctx = EVP_PKEY_CTX_new(pk, NULL);
2821 if (pkey_ctx == NULL) {
2822 *al = SSL_AD_INTERNAL_ERROR;
2823 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_MALLOC_FAILURE);
2826 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) {
2827 *al = SSL_AD_INTERNAL_ERROR;
2828 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
2832 * If client certificate is present and is of the same type, maybe
2833 * use it for key exchange. Don't mind errors from
2834 * EVP_PKEY_derive_set_peer, because it is completely valid to use a
2835 * client certificate for authorization only.
2837 client_pub_pkey = X509_get0_pubkey(s->session->peer);
2838 if (client_pub_pkey) {
2839 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2842 /* Decrypt session key */
2843 sess_key_len = PACKET_remaining(pkt);
2844 if (!PACKET_get_bytes(pkt, &data, sess_key_len)) {
2845 *al = SSL_AD_INTERNAL_ERROR;
2846 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
2849 /* TODO(size_t): Convert this function */
2850 if (ASN1_get_object((const unsigned char **)&data, &Tlen, &Ttag,
2851 &Tclass, (long)sess_key_len) != V_ASN1_CONSTRUCTED
2852 || Ttag != V_ASN1_SEQUENCE || Tclass != V_ASN1_UNIVERSAL) {
2853 *al = SSL_AD_DECODE_ERROR;
2854 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, SSL_R_DECRYPTION_FAILED);
2859 if (EVP_PKEY_decrypt
2860 (pkey_ctx, premaster_secret, &outlen, start, inlen) <= 0) {
2861 *al = SSL_AD_DECODE_ERROR;
2862 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, SSL_R_DECRYPTION_FAILED);
2865 /* Generate master secret */
2866 if (!ssl_generate_master_secret(s, premaster_secret,
2867 sizeof(premaster_secret), 0)) {
2868 *al = SSL_AD_INTERNAL_ERROR;
2869 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
2872 /* Check if pubkey from client certificate was used */
2873 if (EVP_PKEY_CTX_ctrl
2874 (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2875 s->statem.no_cert_verify = 1;
2879 EVP_PKEY_CTX_free(pkey_ctx);
2882 /* Should never happen */
2883 *al = SSL_AD_INTERNAL_ERROR;
2884 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
2889 MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt)
2892 unsigned long alg_k;
2894 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2896 /* For PSK parse and retrieve identity, obtain PSK key */
2897 if ((alg_k & SSL_PSK) && !tls_process_cke_psk_preamble(s, pkt, &al))
2900 if (alg_k & SSL_kPSK) {
2901 /* Identity extracted earlier: should be nothing left */
2902 if (PACKET_remaining(pkt) != 0) {
2903 al = SSL_AD_HANDSHAKE_FAILURE;
2904 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
2905 SSL_R_LENGTH_MISMATCH);
2908 /* PSK handled by ssl_generate_master_secret */
2909 if (!ssl_generate_master_secret(s, NULL, 0, 0)) {
2910 al = SSL_AD_INTERNAL_ERROR;
2911 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2914 } else if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) {
2915 if (!tls_process_cke_rsa(s, pkt, &al))
2917 } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) {
2918 if (!tls_process_cke_dhe(s, pkt, &al))
2920 } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) {
2921 if (!tls_process_cke_ecdhe(s, pkt, &al))
2923 } else if (alg_k & SSL_kSRP) {
2924 if (!tls_process_cke_srp(s, pkt, &al))
2926 } else if (alg_k & SSL_kGOST) {
2927 if (!tls_process_cke_gost(s, pkt, &al))
2930 al = SSL_AD_HANDSHAKE_FAILURE;
2931 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
2932 SSL_R_UNKNOWN_CIPHER_TYPE);
2936 return MSG_PROCESS_CONTINUE_PROCESSING;
2939 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2940 #ifndef OPENSSL_NO_PSK
2941 OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen);
2942 s->s3->tmp.psk = NULL;
2944 ossl_statem_set_error(s);
2945 return MSG_PROCESS_ERROR;
2948 WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst)
2950 #ifndef OPENSSL_NO_SCTP
2951 if (wst == WORK_MORE_A) {
2952 if (SSL_IS_DTLS(s)) {
2953 unsigned char sctpauthkey[64];
2954 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
2956 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
2959 memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
2960 sizeof(DTLS1_SCTP_AUTH_LABEL));
2962 if (SSL_export_keying_material(s, sctpauthkey,
2963 sizeof(sctpauthkey), labelbuffer,
2964 sizeof(labelbuffer), NULL, 0,
2966 ossl_statem_set_error(s);
2970 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
2971 sizeof(sctpauthkey), sctpauthkey);
2976 if ((wst == WORK_MORE_B)
2978 && BIO_dgram_is_sctp(SSL_get_wbio(s))
2979 /* Are we renegotiating? */
2981 /* Are we going to skip the CertificateVerify? */
2982 && (s->session->peer == NULL || s->statem.no_cert_verify)
2983 && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
2984 s->s3->in_read_app_data = 2;
2985 s->rwstate = SSL_READING;
2986 BIO_clear_retry_flags(SSL_get_rbio(s));
2987 BIO_set_retry_read(SSL_get_rbio(s));
2988 ossl_statem_set_sctp_read_sock(s, 1);
2991 ossl_statem_set_sctp_read_sock(s, 0);
2995 if (s->statem.no_cert_verify || !s->session->peer) {
2997 * No certificate verify or no peer certificate so we no longer need
2998 * the handshake_buffer
3000 if (!ssl3_digest_cached_records(s, 0)) {
3001 ossl_statem_set_error(s);
3004 return WORK_FINISHED_CONTINUE;
3006 if (!s->s3->handshake_buffer) {
3007 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE,
3008 ERR_R_INTERNAL_ERROR);
3009 ossl_statem_set_error(s);
3013 * For sigalgs freeze the handshake buffer. If we support
3014 * extms we've done this already so this is a no-op
3016 if (!ssl3_digest_cached_records(s, 1)) {
3017 ossl_statem_set_error(s);
3022 return WORK_FINISHED_CONTINUE;
3025 MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt)
3027 int i, al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR;
3029 unsigned long l, llen;
3030 const unsigned char *certstart, *certbytes;
3031 STACK_OF(X509) *sk = NULL;
3032 PACKET spkt, context;
3035 if ((sk = sk_X509_new_null()) == NULL) {
3036 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3040 /* TODO(TLS1.3): For now we ignore the context. We need to verify this */
3041 if ((SSL_IS_TLS13(s) && !PACKET_get_length_prefixed_1(pkt, &context))
3042 || !PACKET_get_net_3(pkt, &llen)
3043 || !PACKET_get_sub_packet(pkt, &spkt, llen)
3044 || PACKET_remaining(pkt) != 0) {
3045 al = SSL_AD_DECODE_ERROR;
3046 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
3050 for (chainidx = 0; PACKET_remaining(&spkt) > 0; chainidx++) {
3051 if (!PACKET_get_net_3(&spkt, &l)
3052 || !PACKET_get_bytes(&spkt, &certbytes, l)) {
3053 al = SSL_AD_DECODE_ERROR;
3054 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3055 SSL_R_CERT_LENGTH_MISMATCH);
3059 certstart = certbytes;
3060 x = d2i_X509(NULL, (const unsigned char **)&certbytes, l);
3062 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB);
3065 if (certbytes != (certstart + l)) {
3066 al = SSL_AD_DECODE_ERROR;
3067 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3068 SSL_R_CERT_LENGTH_MISMATCH);
3072 if (SSL_IS_TLS13(s)) {
3073 RAW_EXTENSION *rawexts = NULL;
3076 if (!PACKET_get_length_prefixed_2(&spkt, &extensions)) {
3077 al = SSL_AD_DECODE_ERROR;
3078 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, SSL_R_BAD_LENGTH);
3081 if (!tls_collect_extensions(s, &extensions, EXT_TLS1_3_CERTIFICATE,
3083 || !tls_parse_all_extensions(s, EXT_TLS1_3_CERTIFICATE,
3084 rawexts, x, chainidx, &al)) {
3085 OPENSSL_free(rawexts);
3088 OPENSSL_free(rawexts);
3091 if (!sk_X509_push(sk, x)) {
3092 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3098 if (sk_X509_num(sk) <= 0) {
3099 /* TLS does not mind 0 certs returned */
3100 if (s->version == SSL3_VERSION) {
3101 al = SSL_AD_HANDSHAKE_FAILURE;
3102 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3103 SSL_R_NO_CERTIFICATES_RETURNED);
3106 /* Fail for TLS only if we required a certificate */
3107 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3108 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
3109 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3110 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3111 al = SSL_AD_HANDSHAKE_FAILURE;
3114 /* No client certificate so digest cached records */
3115 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) {
3120 i = ssl_verify_cert_chain(s, sk);
3122 al = ssl_verify_alarm_type(s->verify_result);
3123 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3124 SSL_R_CERTIFICATE_VERIFY_FAILED);
3128 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i);
3129 al = SSL_AD_HANDSHAKE_FAILURE;
3132 pkey = X509_get0_pubkey(sk_X509_value(sk, 0));
3134 al = SSL3_AD_HANDSHAKE_FAILURE;
3135 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
3136 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
3141 X509_free(s->session->peer);
3142 s->session->peer = sk_X509_shift(sk);
3143 s->session->verify_result = s->verify_result;
3145 sk_X509_pop_free(s->session->peer_chain, X509_free);
3146 s->session->peer_chain = sk;
3149 * Freeze the handshake buffer. For <TLS1.3 we do this after the CKE
3152 if (SSL_IS_TLS13(s) && !ssl3_digest_cached_records(s, 1)) {
3153 al = SSL_AD_INTERNAL_ERROR;
3154 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3159 * Inconsistency alert: cert_chain does *not* include the peer's own
3160 * certificate, while we do include it in statem_clnt.c
3164 /* Save the current hash state for when we receive the CertificateVerify */
3166 && !ssl_handshake_hash(s, s->cert_verify_hash,
3167 sizeof(s->cert_verify_hash),
3168 &s->cert_verify_hash_len)) {
3169 al = SSL_AD_INTERNAL_ERROR;
3170 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3174 ret = MSG_PROCESS_CONTINUE_READING;
3178 ssl3_send_alert(s, SSL3_AL_FATAL, al);
3179 ossl_statem_set_error(s);
3182 sk_X509_pop_free(sk, X509_free);
3186 int tls_construct_server_certificate(SSL *s, WPACKET *pkt)
3189 int al = SSL_AD_INTERNAL_ERROR;
3191 cpk = ssl_get_server_send_pkey(s);
3193 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3198 * In TLSv1.3 the certificate chain is always preceded by a 0 length context
3199 * for the server Certificate message
3201 if ((SSL_IS_TLS13(s) && !WPACKET_put_bytes_u8(pkt, 0))
3202 || !ssl3_output_cert_chain(s, pkt, cpk, &al)) {
3203 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3204 ssl3_send_alert(s, SSL3_AL_FATAL, al);
3211 int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt)
3213 unsigned char *senc = NULL;
3214 EVP_CIPHER_CTX *ctx = NULL;
3215 HMAC_CTX *hctx = NULL;
3216 unsigned char *p, *encdata1, *encdata2, *macdata1, *macdata2;
3217 const unsigned char *const_p;
3218 int len, slen_full, slen, lenfinal;
3221 SSL_CTX *tctx = s->session_ctx;
3222 unsigned char iv[EVP_MAX_IV_LENGTH];
3223 unsigned char key_name[TLSEXT_KEYNAME_LENGTH];
3224 int iv_len, al = SSL_AD_INTERNAL_ERROR;
3225 size_t macoffset, macendoffset;
3227 unsigned char age_add_c[sizeof(uint32_t)];
3231 if (SSL_IS_TLS13(s)) {
3232 if (RAND_bytes(age_add_u.age_add_c, sizeof(age_add_u)) <= 0)
3234 s->session->ext.tick_age_add = age_add_u.age_add;
3237 /* get session encoding length */
3238 slen_full = i2d_SSL_SESSION(s->session, NULL);
3240 * Some length values are 16 bits, so forget it if session is too
3243 if (slen_full == 0 || slen_full > 0xFF00) {
3244 ossl_statem_set_error(s);
3247 senc = OPENSSL_malloc(slen_full);
3249 ossl_statem_set_error(s);
3253 ctx = EVP_CIPHER_CTX_new();
3254 hctx = HMAC_CTX_new();
3255 if (ctx == NULL || hctx == NULL) {
3256 SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
3261 if (!i2d_SSL_SESSION(s->session, &p))
3265 * create a fresh copy (not shared with other threads) to clean up
3268 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3271 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3273 slen = i2d_SSL_SESSION(sess, NULL);
3274 if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */
3275 SSL_SESSION_free(sess);
3279 if (!i2d_SSL_SESSION(sess, &p)) {
3280 SSL_SESSION_free(sess);
3283 SSL_SESSION_free(sess);
3286 * Initialize HMAC and cipher contexts. If callback present it does
3287 * all the work otherwise use generated values from parent ctx.
3289 if (tctx->ext.ticket_key_cb) {
3290 /* if 0 is returned, write an empty ticket */
3291 int ret = tctx->ext.ticket_key_cb(s, key_name, iv, ctx,
3296 /* Put timeout and length */
3297 if (!WPACKET_put_bytes_u32(pkt, 0)
3298 || !WPACKET_put_bytes_u16(pkt, 0)) {
3299 SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET,
3300 ERR_R_INTERNAL_ERROR);
3304 EVP_CIPHER_CTX_free(ctx);
3305 HMAC_CTX_free(hctx);
3310 iv_len = EVP_CIPHER_CTX_iv_length(ctx);
3312 const EVP_CIPHER *cipher = EVP_aes_256_cbc();
3314 iv_len = EVP_CIPHER_iv_length(cipher);
3315 if (RAND_bytes(iv, iv_len) <= 0)
3317 if (!EVP_EncryptInit_ex(ctx, cipher, NULL,
3318 tctx->ext.tick_aes_key, iv))
3320 if (!HMAC_Init_ex(hctx, tctx->ext.tick_hmac_key,
3321 sizeof(tctx->ext.tick_hmac_key),
3322 EVP_sha256(), NULL))
3324 memcpy(key_name, tctx->ext.tick_key_name,
3325 sizeof(tctx->ext.tick_key_name));
3329 * Ticket lifetime hint (advisory only): We leave this unspecified
3330 * for resumed session (for simplicity), and guess that tickets for
3331 * new sessions will live as long as their sessions.
3333 if (!WPACKET_put_bytes_u32(pkt, s->hit ? 0 : s->session->timeout)
3335 && !WPACKET_put_bytes_u32(pkt, age_add_u.age_add))
3336 /* Now the actual ticket data */
3337 || !WPACKET_start_sub_packet_u16(pkt)
3338 || !WPACKET_get_total_written(pkt, &macoffset)
3339 /* Output key name */
3340 || !WPACKET_memcpy(pkt, key_name, sizeof(key_name))
3342 || !WPACKET_memcpy(pkt, iv, iv_len)
3343 || !WPACKET_reserve_bytes(pkt, slen + EVP_MAX_BLOCK_LENGTH,
3345 /* Encrypt session data */
3346 || !EVP_EncryptUpdate(ctx, encdata1, &len, senc, slen)
3347 || !WPACKET_allocate_bytes(pkt, len, &encdata2)
3348 || encdata1 != encdata2
3349 || !EVP_EncryptFinal(ctx, encdata1 + len, &lenfinal)
3350 || !WPACKET_allocate_bytes(pkt, lenfinal, &encdata2)
3351 || encdata1 + len != encdata2
3352 || len + lenfinal > slen + EVP_MAX_BLOCK_LENGTH
3353 || !WPACKET_get_total_written(pkt, &macendoffset)
3354 || !HMAC_Update(hctx,
3355 (unsigned char *)s->init_buf->data + macoffset,
3356 macendoffset - macoffset)
3357 || !WPACKET_reserve_bytes(pkt, EVP_MAX_MD_SIZE, &macdata1)
3358 || !HMAC_Final(hctx, macdata1, &hlen)
3359 || hlen > EVP_MAX_MD_SIZE
3360 || !WPACKET_allocate_bytes(pkt, hlen, &macdata2)
3361 || macdata1 != macdata2
3362 || !WPACKET_close(pkt)
3364 && !tls_construct_extensions(s, pkt,
3365 EXT_TLS1_3_NEW_SESSION_TICKET,
3367 SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
3370 EVP_CIPHER_CTX_free(ctx);
3371 HMAC_CTX_free(hctx);
3377 EVP_CIPHER_CTX_free(ctx);
3378 HMAC_CTX_free(hctx);
3379 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3384 * In TLSv1.3 this is called from the extensions code, otherwise it is used to
3385 * create a separate message. Returns 1 on success or 0 on failure.
3387 int tls_construct_cert_status_body(SSL *s, WPACKET *pkt)
3389 if (!WPACKET_put_bytes_u8(pkt, s->ext.status_type)
3390 || !WPACKET_sub_memcpy_u24(pkt, s->ext.ocsp.resp,
3391 s->ext.ocsp.resp_len)) {
3392 SSLerr(SSL_F_TLS_CONSTRUCT_CERT_STATUS_BODY, ERR_R_INTERNAL_ERROR);
3399 int tls_construct_cert_status(SSL *s, WPACKET *pkt)
3401 if (!tls_construct_cert_status_body(s, pkt)) {
3402 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3409 #ifndef OPENSSL_NO_NEXTPROTONEG
3411 * tls_process_next_proto reads a Next Protocol Negotiation handshake message.
3412 * It sets the next_proto member in s if found
3414 MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt)
3416 PACKET next_proto, padding;
3417 size_t next_proto_len;
3420 * The payload looks like:
3422 * uint8 proto[proto_len];
3423 * uint8 padding_len;
3424 * uint8 padding[padding_len];
3426 if (!PACKET_get_length_prefixed_1(pkt, &next_proto)
3427 || !PACKET_get_length_prefixed_1(pkt, &padding)
3428 || PACKET_remaining(pkt) > 0) {
3429 SSLerr(SSL_F_TLS_PROCESS_NEXT_PROTO, SSL_R_LENGTH_MISMATCH);
3433 if (!PACKET_memdup(&next_proto, &s->ext.npn, &next_proto_len)) {
3438 s->ext.npn_len = (unsigned char)next_proto_len;
3440 return MSG_PROCESS_CONTINUE_READING;
3442 ossl_statem_set_error(s);
3443 return MSG_PROCESS_ERROR;
3447 static int tls_construct_encrypted_extensions(SSL *s, WPACKET *pkt)
3451 if (!tls_construct_extensions(s, pkt, EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
3453 ssl3_send_alert(s, SSL3_AL_FATAL, al);
3454 SSLerr(SSL_F_TLS_CONSTRUCT_ENCRYPTED_EXTENSIONS, ERR_R_INTERNAL_ERROR);
3455 ssl3_send_alert(s, SSL3_AL_FATAL, al);
3462 #define SSLV2_CIPHER_LEN 3
3464 STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,
3465 PACKET *cipher_suites,
3466 STACK_OF(SSL_CIPHER) **skp,
3467 int sslv2format, int *al)
3469 const SSL_CIPHER *c;
3470 STACK_OF(SSL_CIPHER) *sk;
3472 /* 3 = SSLV2_CIPHER_LEN > TLS_CIPHER_LEN = 2. */
3473 unsigned char cipher[SSLV2_CIPHER_LEN];
3475 s->s3->send_connection_binding = 0;
3477 n = sslv2format ? SSLV2_CIPHER_LEN : TLS_CIPHER_LEN;
3479 if (PACKET_remaining(cipher_suites) == 0) {
3480 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, SSL_R_NO_CIPHERS_SPECIFIED);
3481 *al = SSL_AD_ILLEGAL_PARAMETER;
3485 if (PACKET_remaining(cipher_suites) % n != 0) {
3486 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3487 SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
3488 *al = SSL_AD_DECODE_ERROR;
3492 sk = sk_SSL_CIPHER_new_null();
3494 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
3495 *al = SSL_AD_INTERNAL_ERROR;
3500 size_t numciphers = PACKET_remaining(cipher_suites) / n;
3501 PACKET sslv2ciphers = *cipher_suites;
3502 unsigned int leadbyte;
3506 * We store the raw ciphers list in SSLv3+ format so we need to do some
3507 * preprocessing to convert the list first. If there are any SSLv2 only
3508 * ciphersuites with a non-zero leading byte then we are going to
3509 * slightly over allocate because we won't store those. But that isn't a
3512 raw = OPENSSL_malloc(numciphers * TLS_CIPHER_LEN);
3513 s->s3->tmp.ciphers_raw = raw;
3515 *al = SSL_AD_INTERNAL_ERROR;
3518 for (s->s3->tmp.ciphers_rawlen = 0;
3519 PACKET_remaining(&sslv2ciphers) > 0;
3520 raw += TLS_CIPHER_LEN) {
3521 if (!PACKET_get_1(&sslv2ciphers, &leadbyte)
3523 && !PACKET_copy_bytes(&sslv2ciphers, raw,
3526 && !PACKET_forward(&sslv2ciphers, TLS_CIPHER_LEN))) {
3527 *al = SSL_AD_INTERNAL_ERROR;
3528 OPENSSL_free(s->s3->tmp.ciphers_raw);
3529 s->s3->tmp.ciphers_raw = NULL;
3530 s->s3->tmp.ciphers_rawlen = 0;
3534 s->s3->tmp.ciphers_rawlen += TLS_CIPHER_LEN;
3536 } else if (!PACKET_memdup(cipher_suites, &s->s3->tmp.ciphers_raw,
3537 &s->s3->tmp.ciphers_rawlen)) {
3538 *al = SSL_AD_INTERNAL_ERROR;
3542 while (PACKET_copy_bytes(cipher_suites, cipher, n)) {
3544 * SSLv3 ciphers wrapped in an SSLv2-compatible ClientHello have the
3545 * first byte set to zero, while true SSLv2 ciphers have a non-zero
3546 * first byte. We don't support any true SSLv2 ciphers, so skip them.
3548 if (sslv2format && cipher[0] != '\0')
3551 /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */
3552 if ((cipher[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) &&
3553 (cipher[n - 1] == (SSL3_CK_SCSV & 0xff))) {
3554 /* SCSV fatal if renegotiating */
3555 if (s->renegotiate) {
3556 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3557 SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING);
3558 *al = SSL_AD_HANDSHAKE_FAILURE;
3561 s->s3->send_connection_binding = 1;
3565 /* Check for TLS_FALLBACK_SCSV */
3566 if ((cipher[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) &&
3567 (cipher[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) {
3569 * The SCSV indicates that the client previously tried a higher
3570 * version. Fail if the current version is an unexpected
3573 if (!ssl_check_version_downgrade(s)) {
3574 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3575 SSL_R_INAPPROPRIATE_FALLBACK);
3576 *al = SSL_AD_INAPPROPRIATE_FALLBACK;
3582 /* For SSLv2-compat, ignore leading 0-byte. */
3583 c = ssl_get_cipher_by_char(s, sslv2format ? &cipher[1] : cipher);
3585 if (!sk_SSL_CIPHER_push(sk, c)) {
3586 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
3587 *al = SSL_AD_INTERNAL_ERROR;
3592 if (PACKET_remaining(cipher_suites) > 0) {
3593 *al = SSL_AD_INTERNAL_ERROR;
3594 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_INTERNAL_ERROR);
3601 sk_SSL_CIPHER_free(sk);