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 STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,
65 PACKET *cipher_suites,
67 **skp, int sslv2format,
71 * server_read_transition() encapsulates the logic for the allowed handshake
72 * state transitions when the server is reading messages from the client. The
73 * message type that the client has sent is provided in |mt|. The current state
74 * is in |s->statem.hand_state|.
76 * Valid return values are:
77 * 1: Success (transition allowed)
78 * 0: Error (transition not allowed)
80 int ossl_statem_server_read_transition(SSL *s, int mt)
82 OSSL_STATEM *st = &s->statem;
84 switch (st->hand_state) {
89 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
90 if (mt == SSL3_MT_CLIENT_HELLO) {
91 st->hand_state = TLS_ST_SR_CLNT_HELLO;
96 case TLS_ST_SW_SRVR_DONE:
98 * If we get a CKE message after a ServerDone then either
99 * 1) We didn't request a Certificate
101 * 2) If we did request one then
102 * a) We allow no Certificate to be returned
104 * b) We are running SSL3 (in TLS1.0+ the client must return a 0
105 * list if we requested a certificate)
107 if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) {
108 if (s->s3->tmp.cert_request) {
109 if (s->version == SSL3_VERSION) {
110 if ((s->verify_mode & SSL_VERIFY_PEER)
111 && (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
113 * This isn't an unexpected message as such - we're just
114 * not going to accept it because we require a client
117 ssl3_send_alert(s, SSL3_AL_FATAL,
118 SSL3_AD_HANDSHAKE_FAILURE);
119 SSLerr(SSL_F_OSSL_STATEM_SERVER_READ_TRANSITION,
120 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
123 st->hand_state = TLS_ST_SR_KEY_EXCH;
127 st->hand_state = TLS_ST_SR_KEY_EXCH;
130 } else if (s->s3->tmp.cert_request) {
131 if (mt == SSL3_MT_CERTIFICATE) {
132 st->hand_state = TLS_ST_SR_CERT;
139 if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) {
140 st->hand_state = TLS_ST_SR_KEY_EXCH;
145 case TLS_ST_SR_KEY_EXCH:
147 * We should only process a CertificateVerify message if we have
148 * received a Certificate from the client. If so then |s->session->peer|
149 * will be non NULL. In some instances a CertificateVerify message is
150 * not required even if the peer has sent a Certificate (e.g. such as in
151 * the case of static DH). In that case |st->no_cert_verify| should be
154 if (s->session->peer == NULL || st->no_cert_verify) {
155 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
157 * For the ECDH ciphersuites when the client sends its ECDH
158 * pub key in a certificate, the CertificateVerify message is
159 * not sent. Also for GOST ciphersuites when the client uses
160 * its key from the certificate for key exchange.
162 st->hand_state = TLS_ST_SR_CHANGE;
166 if (mt == SSL3_MT_CERTIFICATE_VERIFY) {
167 st->hand_state = TLS_ST_SR_CERT_VRFY;
173 case TLS_ST_SR_CERT_VRFY:
174 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
175 st->hand_state = TLS_ST_SR_CHANGE;
180 case TLS_ST_SR_CHANGE:
181 #ifndef OPENSSL_NO_NEXTPROTONEG
182 if (s->s3->next_proto_neg_seen) {
183 if (mt == SSL3_MT_NEXT_PROTO) {
184 st->hand_state = TLS_ST_SR_NEXT_PROTO;
189 if (mt == SSL3_MT_FINISHED) {
190 st->hand_state = TLS_ST_SR_FINISHED;
193 #ifndef OPENSSL_NO_NEXTPROTONEG
198 #ifndef OPENSSL_NO_NEXTPROTONEG
199 case TLS_ST_SR_NEXT_PROTO:
200 if (mt == SSL3_MT_FINISHED) {
201 st->hand_state = TLS_ST_SR_FINISHED;
207 case TLS_ST_SW_FINISHED:
208 if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
209 st->hand_state = TLS_ST_SR_CHANGE;
215 /* No valid transition found */
216 ssl3_send_alert(s, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE);
217 SSLerr(SSL_F_OSSL_STATEM_SERVER_READ_TRANSITION, SSL_R_UNEXPECTED_MESSAGE);
222 * Should we send a ServerKeyExchange message?
224 * Valid return values are:
228 static int send_server_key_exchange(SSL *s)
230 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
233 * only send a ServerKeyExchange if DH or fortezza but we have a
234 * sign only certificate PSK: may send PSK identity hints For
235 * ECC ciphersuites, we send a serverKeyExchange message only if
236 * the cipher suite is either ECDH-anon or ECDHE. In other cases,
237 * the server certificate contains the server's public key for
240 if (alg_k & (SSL_kDHE | SSL_kECDHE)
242 * PSK: send ServerKeyExchange if PSK identity hint if
245 #ifndef OPENSSL_NO_PSK
246 /* Only send SKE if we have identity hint for plain PSK */
247 || ((alg_k & (SSL_kPSK | SSL_kRSAPSK))
248 && s->cert->psk_identity_hint)
249 /* For other PSK always send SKE */
250 || (alg_k & (SSL_PSK & (SSL_kDHEPSK | SSL_kECDHEPSK)))
252 #ifndef OPENSSL_NO_SRP
253 /* SRP: send ServerKeyExchange */
254 || (alg_k & SSL_kSRP)
264 * Should we send a CertificateRequest message?
266 * Valid return values are:
270 static int send_certificate_request(SSL *s)
273 /* don't request cert unless asked for it: */
274 s->verify_mode & SSL_VERIFY_PEER
276 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
277 * during re-negotiation:
279 && ((s->session->peer == NULL) ||
280 !(s->verify_mode & SSL_VERIFY_CLIENT_ONCE))
282 * never request cert in anonymous ciphersuites (see
283 * section "Certificate request" in SSL 3 drafts and in
286 && (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
288 * ... except when the application insists on
289 * verification (against the specs, but statem_clnt.c accepts
292 || (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
293 /* don't request certificate for SRP auth */
294 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP)
296 * With normal PSK Certificates and Certificate Requests
299 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aPSK)) {
307 * server_write_transition() works out what handshake state to move to next
308 * when the server is writing messages to be sent to the client.
310 WRITE_TRAN ossl_statem_server_write_transition(SSL *s)
312 OSSL_STATEM *st = &s->statem;
314 switch (st->hand_state) {
316 /* Shouldn't happen */
317 return WRITE_TRAN_ERROR;
320 /* Just go straight to trying to read from the client */
321 return WRITE_TRAN_FINISHED;
324 /* We must be trying to renegotiate */
325 st->hand_state = TLS_ST_SW_HELLO_REQ;
326 return WRITE_TRAN_CONTINUE;
328 case TLS_ST_SW_HELLO_REQ:
329 st->hand_state = TLS_ST_OK;
330 ossl_statem_set_in_init(s, 0);
331 return WRITE_TRAN_CONTINUE;
333 case TLS_ST_SR_CLNT_HELLO:
334 if (SSL_IS_DTLS(s) && !s->d1->cookie_verified
335 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
336 st->hand_state = DTLS_ST_SW_HELLO_VERIFY_REQUEST;
338 st->hand_state = TLS_ST_SW_SRVR_HELLO;
339 return WRITE_TRAN_CONTINUE;
341 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
342 return WRITE_TRAN_FINISHED;
344 case TLS_ST_SW_SRVR_HELLO:
346 if (s->tlsext_ticket_expected)
347 st->hand_state = TLS_ST_SW_SESSION_TICKET;
349 st->hand_state = TLS_ST_SW_CHANGE;
351 /* Check if it is anon DH or anon ECDH, */
352 /* normal PSK or SRP */
353 if (!(s->s3->tmp.new_cipher->algorithm_auth &
354 (SSL_aNULL | SSL_aSRP | SSL_aPSK))) {
355 st->hand_state = TLS_ST_SW_CERT;
356 } else if (send_server_key_exchange(s)) {
357 st->hand_state = TLS_ST_SW_KEY_EXCH;
358 } else if (send_certificate_request(s)) {
359 st->hand_state = TLS_ST_SW_CERT_REQ;
361 st->hand_state = TLS_ST_SW_SRVR_DONE;
364 return WRITE_TRAN_CONTINUE;
367 if (s->tlsext_status_expected) {
368 st->hand_state = TLS_ST_SW_CERT_STATUS;
369 return WRITE_TRAN_CONTINUE;
373 case TLS_ST_SW_CERT_STATUS:
374 if (send_server_key_exchange(s)) {
375 st->hand_state = TLS_ST_SW_KEY_EXCH;
376 return WRITE_TRAN_CONTINUE;
380 case TLS_ST_SW_KEY_EXCH:
381 if (send_certificate_request(s)) {
382 st->hand_state = TLS_ST_SW_CERT_REQ;
383 return WRITE_TRAN_CONTINUE;
387 case TLS_ST_SW_CERT_REQ:
388 st->hand_state = TLS_ST_SW_SRVR_DONE;
389 return WRITE_TRAN_CONTINUE;
391 case TLS_ST_SW_SRVR_DONE:
392 return WRITE_TRAN_FINISHED;
394 case TLS_ST_SR_FINISHED:
396 st->hand_state = TLS_ST_OK;
397 ossl_statem_set_in_init(s, 0);
398 return WRITE_TRAN_CONTINUE;
399 } else if (s->tlsext_ticket_expected) {
400 st->hand_state = TLS_ST_SW_SESSION_TICKET;
402 st->hand_state = TLS_ST_SW_CHANGE;
404 return WRITE_TRAN_CONTINUE;
406 case TLS_ST_SW_SESSION_TICKET:
407 st->hand_state = TLS_ST_SW_CHANGE;
408 return WRITE_TRAN_CONTINUE;
410 case TLS_ST_SW_CHANGE:
411 st->hand_state = TLS_ST_SW_FINISHED;
412 return WRITE_TRAN_CONTINUE;
414 case TLS_ST_SW_FINISHED:
416 return WRITE_TRAN_FINISHED;
418 st->hand_state = TLS_ST_OK;
419 ossl_statem_set_in_init(s, 0);
420 return WRITE_TRAN_CONTINUE;
425 * Perform any pre work that needs to be done prior to sending a message from
426 * the server to the client.
428 WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst)
430 OSSL_STATEM *st = &s->statem;
432 switch (st->hand_state) {
434 /* No pre work to be done */
437 case TLS_ST_SW_HELLO_REQ:
440 dtls1_clear_sent_buffer(s);
443 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
445 if (SSL_IS_DTLS(s)) {
446 dtls1_clear_sent_buffer(s);
447 /* We don't buffer this message so don't use the timer */
452 case TLS_ST_SW_SRVR_HELLO:
453 if (SSL_IS_DTLS(s)) {
455 * Messages we write from now on should be bufferred and
456 * retransmitted if necessary, so we need to use the timer now
462 case TLS_ST_SW_SRVR_DONE:
463 #ifndef OPENSSL_NO_SCTP
464 if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s)))
465 return dtls_wait_for_dry(s);
467 return WORK_FINISHED_CONTINUE;
469 case TLS_ST_SW_SESSION_TICKET:
470 if (SSL_IS_DTLS(s)) {
472 * We're into the last flight. We don't retransmit the last flight
473 * unless we need to, so we don't use the timer
479 case TLS_ST_SW_CHANGE:
480 s->session->cipher = s->s3->tmp.new_cipher;
481 if (!s->method->ssl3_enc->setup_key_block(s)) {
482 ossl_statem_set_error(s);
485 if (SSL_IS_DTLS(s)) {
487 * We're into the last flight. We don't retransmit the last flight
488 * unless we need to, so we don't use the timer. This might have
489 * already been set to 0 if we sent a NewSessionTicket message,
490 * but we'll set it again here in case we didn't.
494 return WORK_FINISHED_CONTINUE;
497 return tls_finish_handshake(s, wst);
500 return WORK_FINISHED_CONTINUE;
504 * Perform any work that needs to be done after sending a message from the
505 * server to the client.
507 WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst)
509 OSSL_STATEM *st = &s->statem;
513 switch (st->hand_state) {
515 /* No post work to be done */
518 case TLS_ST_SW_HELLO_REQ:
519 if (statem_flush(s) != 1)
521 if (!ssl3_init_finished_mac(s)) {
522 ossl_statem_set_error(s);
527 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
528 if (statem_flush(s) != 1)
530 /* HelloVerifyRequest resets Finished MAC */
531 if (s->version != DTLS1_BAD_VER && !ssl3_init_finished_mac(s)) {
532 ossl_statem_set_error(s);
536 * The next message should be another ClientHello which we need to
537 * treat like it was the first packet
542 case TLS_ST_SW_SRVR_HELLO:
543 #ifndef OPENSSL_NO_SCTP
544 if (SSL_IS_DTLS(s) && s->hit) {
545 unsigned char sctpauthkey[64];
546 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
549 * Add new shared key for SCTP-Auth, will be ignored if no
552 memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
553 sizeof(DTLS1_SCTP_AUTH_LABEL));
555 if (SSL_export_keying_material(s, sctpauthkey,
556 sizeof(sctpauthkey), labelbuffer,
557 sizeof(labelbuffer), NULL, 0,
559 ossl_statem_set_error(s);
563 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
564 sizeof(sctpauthkey), sctpauthkey);
569 case TLS_ST_SW_CHANGE:
570 #ifndef OPENSSL_NO_SCTP
571 if (SSL_IS_DTLS(s) && !s->hit) {
573 * Change to new shared key of SCTP-Auth, will be ignored if
576 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
580 if (!s->method->ssl3_enc->change_cipher_state(s,
581 SSL3_CHANGE_CIPHER_SERVER_WRITE))
583 ossl_statem_set_error(s);
588 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
591 case TLS_ST_SW_SRVR_DONE:
592 if (statem_flush(s) != 1)
596 case TLS_ST_SW_FINISHED:
597 if (statem_flush(s) != 1)
599 #ifndef OPENSSL_NO_SCTP
600 if (SSL_IS_DTLS(s) && s->hit) {
602 * Change to new shared key of SCTP-Auth, will be ignored if
605 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
612 return WORK_FINISHED_CONTINUE;
616 * Get the message construction function and message type for sending from the
619 * Valid return values are:
623 int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt,
624 confunc_f *confunc, int *mt)
626 OSSL_STATEM *st = &s->statem;
628 switch (st->hand_state) {
630 /* Shouldn't happen */
633 case TLS_ST_SW_CHANGE:
635 *confunc = dtls_construct_change_cipher_spec;
637 *confunc = tls_construct_change_cipher_spec;
638 *mt = SSL3_MT_CHANGE_CIPHER_SPEC;
641 case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
642 *confunc = dtls_construct_hello_verify_request;
643 *mt = DTLS1_MT_HELLO_VERIFY_REQUEST;
646 case TLS_ST_SW_HELLO_REQ:
647 /* No construction function needed */
649 *mt = SSL3_MT_HELLO_REQUEST;
652 case TLS_ST_SW_SRVR_HELLO:
653 *confunc = tls_construct_server_hello;
654 *mt = SSL3_MT_SERVER_HELLO;
658 *confunc = tls_construct_server_certificate;
659 *mt = SSL3_MT_CERTIFICATE;
662 case TLS_ST_SW_KEY_EXCH:
663 *confunc = tls_construct_server_key_exchange;
664 *mt = SSL3_MT_SERVER_KEY_EXCHANGE;
667 case TLS_ST_SW_CERT_REQ:
668 *confunc = tls_construct_certificate_request;
669 *mt = SSL3_MT_CERTIFICATE_REQUEST;
672 case TLS_ST_SW_SRVR_DONE:
673 *confunc = tls_construct_server_done;
674 *mt = SSL3_MT_SERVER_DONE;
677 case TLS_ST_SW_SESSION_TICKET:
678 *confunc = tls_construct_new_session_ticket;
679 *mt = SSL3_MT_NEWSESSION_TICKET;
682 case TLS_ST_SW_CERT_STATUS:
683 *confunc = tls_construct_cert_status;
684 *mt = SSL3_MT_CERTIFICATE_STATUS;
687 case TLS_ST_SW_FINISHED:
688 *confunc = tls_construct_finished;
689 *mt = SSL3_MT_FINISHED;
697 * Maximum size (excluding the Handshake header) of a ClientHello message,
698 * calculated as follows:
700 * 2 + # client_version
701 * 32 + # only valid length for random
702 * 1 + # length of session_id
703 * 32 + # maximum size for session_id
704 * 2 + # length of cipher suites
705 * 2^16-2 + # maximum length of cipher suites array
706 * 1 + # length of compression_methods
707 * 2^8-1 + # maximum length of compression methods
708 * 2 + # length of extensions
709 * 2^16-1 # maximum length of extensions
711 #define CLIENT_HELLO_MAX_LENGTH 131396
713 #define CLIENT_KEY_EXCH_MAX_LENGTH 2048
714 #define NEXT_PROTO_MAX_LENGTH 514
717 * Returns the maximum allowed length for the current message that we are
718 * reading. Excludes the message header.
720 size_t ossl_statem_server_max_message_size(SSL *s)
722 OSSL_STATEM *st = &s->statem;
724 switch (st->hand_state) {
726 /* Shouldn't happen */
729 case TLS_ST_SR_CLNT_HELLO:
730 return CLIENT_HELLO_MAX_LENGTH;
733 return s->max_cert_list;
735 case TLS_ST_SR_KEY_EXCH:
736 return CLIENT_KEY_EXCH_MAX_LENGTH;
738 case TLS_ST_SR_CERT_VRFY:
739 return SSL3_RT_MAX_PLAIN_LENGTH;
741 #ifndef OPENSSL_NO_NEXTPROTONEG
742 case TLS_ST_SR_NEXT_PROTO:
743 return NEXT_PROTO_MAX_LENGTH;
746 case TLS_ST_SR_CHANGE:
747 return CCS_MAX_LENGTH;
749 case TLS_ST_SR_FINISHED:
750 return FINISHED_MAX_LENGTH;
755 * Process a message that the server has received from the client.
757 MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt)
759 OSSL_STATEM *st = &s->statem;
761 switch (st->hand_state) {
763 /* Shouldn't happen */
764 return MSG_PROCESS_ERROR;
766 case TLS_ST_SR_CLNT_HELLO:
767 return tls_process_client_hello(s, pkt);
770 return tls_process_client_certificate(s, pkt);
772 case TLS_ST_SR_KEY_EXCH:
773 return tls_process_client_key_exchange(s, pkt);
775 case TLS_ST_SR_CERT_VRFY:
776 return tls_process_cert_verify(s, pkt);
778 #ifndef OPENSSL_NO_NEXTPROTONEG
779 case TLS_ST_SR_NEXT_PROTO:
780 return tls_process_next_proto(s, pkt);
783 case TLS_ST_SR_CHANGE:
784 return tls_process_change_cipher_spec(s, pkt);
786 case TLS_ST_SR_FINISHED:
787 return tls_process_finished(s, pkt);
792 * Perform any further processing required following the receipt of a message
795 WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst)
797 OSSL_STATEM *st = &s->statem;
799 switch (st->hand_state) {
801 /* Shouldn't happen */
804 case TLS_ST_SR_CLNT_HELLO:
805 return tls_post_process_client_hello(s, wst);
807 case TLS_ST_SR_KEY_EXCH:
808 return tls_post_process_client_key_exchange(s, wst);
810 case TLS_ST_SR_CERT_VRFY:
811 #ifndef OPENSSL_NO_SCTP
812 if ( /* Is this SCTP? */
813 BIO_dgram_is_sctp(SSL_get_wbio(s))
814 /* Are we renegotiating? */
815 && s->renegotiate && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
816 s->s3->in_read_app_data = 2;
817 s->rwstate = SSL_READING;
818 BIO_clear_retry_flags(SSL_get_rbio(s));
819 BIO_set_retry_read(SSL_get_rbio(s));
820 ossl_statem_set_sctp_read_sock(s, 1);
823 ossl_statem_set_sctp_read_sock(s, 0);
826 return WORK_FINISHED_CONTINUE;
831 #ifndef OPENSSL_NO_SRP
832 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
834 int ret = SSL_ERROR_NONE;
836 *al = SSL_AD_UNRECOGNIZED_NAME;
838 if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
839 (s->srp_ctx.TLS_ext_srp_username_callback != NULL)) {
840 if (s->srp_ctx.login == NULL) {
842 * RFC 5054 says SHOULD reject, we do so if There is no srp
846 *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
848 ret = SSL_srp_server_param_with_username(s, al);
855 int dtls_raw_hello_verify_request(WPACKET *pkt, unsigned char *cookie,
858 /* Always use DTLS 1.0 version: see RFC 6347 */
859 if (!WPACKET_put_bytes_u16(pkt, DTLS1_VERSION)
860 || !WPACKET_sub_memcpy_u8(pkt, cookie, cookie_len))
866 int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt)
868 unsigned int cookie_leni;
869 if (s->ctx->app_gen_cookie_cb == NULL ||
870 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
871 &cookie_leni) == 0 ||
873 SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST,
874 SSL_R_COOKIE_GEN_CALLBACK_FAILURE);
877 s->d1->cookie_len = cookie_leni;
879 if (!dtls_raw_hello_verify_request(pkt, s->d1->cookie,
880 s->d1->cookie_len)) {
881 SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST, ERR_R_INTERNAL_ERROR);
888 MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt)
890 int i, al = SSL_AD_INTERNAL_ERROR;
895 #ifndef OPENSSL_NO_COMP
896 SSL_COMP *comp = NULL;
898 STACK_OF(SSL_CIPHER) *ciphers = NULL;
900 /* |cookie| will only be initialized for DTLS. */
901 PACKET session_id, compression, extensions, cookie;
902 static const unsigned char null_compression = 0;
903 CLIENTHELLO_MSG clienthello;
906 * First, parse the raw ClientHello data into the CLIENTHELLO_MSG structure.
908 memset(&clienthello, 0, sizeof(clienthello));
909 clienthello.isv2 = RECORD_LAYER_is_sslv2_record(&s->rlayer);
910 PACKET_null_init(&cookie);
912 if (clienthello.isv2) {
916 * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
917 * header is sent directly on the wire, not wrapped as a TLS
918 * record. Our record layer just processes the message length and passes
919 * the rest right through. Its format is:
921 * 0-1 msg_length - decoded by the record layer
922 * 2 msg_type - s->init_msg points here
924 * 5-6 cipher_spec_length
925 * 7-8 session_id_length
926 * 9-10 challenge_length
930 if (!PACKET_get_1(pkt, &mt)
931 || mt != SSL2_MT_CLIENT_HELLO) {
933 * Should never happen. We should have tested this in the record
934 * layer in order to have determined that this is a SSLv2 record
937 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
942 if (!PACKET_get_net_2(pkt, &clienthello.legacy_version)) {
943 al = SSL_AD_DECODE_ERROR;
944 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
948 /* Parse the message and load client random. */
949 if (clienthello.isv2) {
951 * Handle an SSLv2 backwards compatible ClientHello
952 * Note, this is only for SSLv3+ using the backward compatible format.
953 * Real SSLv2 is not supported, and is rejected below.
955 unsigned int ciphersuite_len, session_id_len, challenge_len;
958 if (!PACKET_get_net_2(pkt, &ciphersuite_len)
959 || !PACKET_get_net_2(pkt, &session_id_len)
960 || !PACKET_get_net_2(pkt, &challenge_len)) {
961 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
962 SSL_R_RECORD_LENGTH_MISMATCH);
963 al = SSL_AD_DECODE_ERROR;
967 if (session_id_len > SSL_MAX_SSL_SESSION_ID_LENGTH) {
968 al = SSL_AD_DECODE_ERROR;
969 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
973 if (!PACKET_get_sub_packet(pkt, &clienthello.ciphersuites,
975 || !PACKET_copy_bytes(pkt, clienthello.session_id, session_id_len)
976 || !PACKET_get_sub_packet(pkt, &challenge, challenge_len)
978 || PACKET_remaining(pkt) != 0) {
979 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
980 SSL_R_RECORD_LENGTH_MISMATCH);
981 al = SSL_AD_DECODE_ERROR;
984 clienthello.session_id_len = session_id_len;
986 /* Load the client random and compression list. We use SSL3_RANDOM_SIZE
987 * here rather than sizeof(clienthello.random) because that is the limit
988 * for SSLv3 and it is fixed. It won't change even if
989 * sizeof(clienthello.random) does.
991 challenge_len = challenge_len > SSL3_RANDOM_SIZE
992 ? SSL3_RANDOM_SIZE : challenge_len;
993 memset(clienthello.random, 0, SSL3_RANDOM_SIZE);
994 if (!PACKET_copy_bytes(&challenge,
995 clienthello.random + SSL3_RANDOM_SIZE -
996 challenge_len, challenge_len)
997 /* Advertise only null compression. */
998 || !PACKET_buf_init(&compression, &null_compression, 1)) {
999 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
1000 al = SSL_AD_INTERNAL_ERROR;
1004 PACKET_null_init(&clienthello.extensions);
1006 /* Regular ClientHello. */
1007 if (!PACKET_copy_bytes(pkt, clienthello.random, SSL3_RANDOM_SIZE)
1008 || !PACKET_get_length_prefixed_1(pkt, &session_id)
1009 || !PACKET_copy_all(&session_id, clienthello.session_id,
1010 SSL_MAX_SSL_SESSION_ID_LENGTH,
1011 &clienthello.session_id_len)) {
1012 al = SSL_AD_DECODE_ERROR;
1013 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1017 if (SSL_IS_DTLS(s)) {
1018 if (!PACKET_get_length_prefixed_1(pkt, &cookie)) {
1019 al = SSL_AD_DECODE_ERROR;
1020 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1023 if (!PACKET_copy_all(&cookie, clienthello.dtls_cookie,
1024 DTLS1_COOKIE_LENGTH,
1025 &clienthello.dtls_cookie_len)) {
1026 al = SSL_AD_DECODE_ERROR;
1027 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1031 * If we require cookies and this ClientHello doesn't contain one,
1032 * just return since we do not want to allocate any memory yet.
1033 * So check cookie length...
1035 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
1036 if (clienthello.dtls_cookie_len == 0)
1041 if (!PACKET_get_length_prefixed_2(pkt, &clienthello.ciphersuites)) {
1042 al = SSL_AD_DECODE_ERROR;
1043 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1047 if (!PACKET_get_length_prefixed_1(pkt, &compression)) {
1048 al = SSL_AD_DECODE_ERROR;
1049 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1053 /* Could be empty. */
1054 if (PACKET_remaining(pkt) == 0) {
1055 PACKET_null_init(&clienthello.extensions);
1057 if (!PACKET_get_length_prefixed_2(pkt, &clienthello.extensions)) {
1058 al = SSL_AD_DECODE_ERROR;
1059 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1065 if (!PACKET_copy_all(&compression, clienthello.compressions,
1066 MAX_COMPRESSIONS_SIZE,
1067 &clienthello.compressions_len)) {
1068 al = SSL_AD_DECODE_ERROR;
1069 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1073 /* Preserve the raw extensions PACKET for later use */
1074 extensions = clienthello.extensions;
1075 if (!tls_collect_extensions(&extensions, &clienthello.pre_proc_exts,
1076 &clienthello.num_extensions, &al)) {
1077 /* SSLerr already been called */
1081 /* Finished parsing the ClientHello, now we can start processing it */
1083 /* Set up the client_random */
1084 memcpy(s->s3->client_random, clienthello.random, SSL3_RANDOM_SIZE);
1086 /* Choose the version */
1088 if (clienthello.isv2) {
1089 if (clienthello.legacy_version == SSL2_VERSION
1090 || (clienthello.legacy_version & 0xff00)
1091 != (SSL3_VERSION_MAJOR << 8)) {
1093 * This is real SSLv2 or something complete unknown. We don't
1096 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
1100 s->client_version = clienthello.legacy_version;
1103 * Do SSL/TLS version negotiation if applicable. For DTLS we just check
1104 * versions are potentially compatible. Version negotiation comes later.
1106 if (!SSL_IS_DTLS(s)) {
1107 protverr = ssl_choose_server_version(s, &clienthello);
1108 } else if (s->method->version != DTLS_ANY_VERSION &&
1109 DTLS_VERSION_LT((int)clienthello.legacy_version, s->version)) {
1110 protverr = SSL_R_VERSION_TOO_LOW;
1116 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr);
1117 if ((!s->enc_write_ctx && !s->write_hash)) {
1118 /* like ssl3_get_record, send alert using remote version number */
1119 s->version = s->client_version = clienthello.legacy_version;
1121 al = SSL_AD_PROTOCOL_VERSION;
1125 if (SSL_IS_DTLS(s)) {
1126 /* Empty cookie was already handled above by returning early. */
1127 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
1128 if (s->ctx->app_verify_cookie_cb != NULL) {
1129 if (s->ctx->app_verify_cookie_cb(s, clienthello.dtls_cookie,
1130 clienthello.dtls_cookie_len) == 0) {
1131 al = SSL_AD_HANDSHAKE_FAILURE;
1132 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1133 SSL_R_COOKIE_MISMATCH);
1135 /* else cookie verification succeeded */
1137 /* default verification */
1138 } else if (s->d1->cookie_len != clienthello.dtls_cookie_len
1139 || memcmp(clienthello.dtls_cookie, s->d1->cookie,
1140 s->d1->cookie_len) != 0) {
1141 al = SSL_AD_HANDSHAKE_FAILURE;
1142 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1145 s->d1->cookie_verified = 1;
1147 if (s->method->version == DTLS_ANY_VERSION) {
1148 protverr = ssl_choose_server_version(s, &clienthello);
1149 if (protverr != 0) {
1150 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr);
1151 s->version = s->client_version;
1152 al = SSL_AD_PROTOCOL_VERSION;
1160 /* We need to do this before getting the session */
1161 if (!tls_check_client_ems_support(s, &clienthello)) {
1162 /* Only fails if the extension is malformed */
1163 al = SSL_AD_DECODE_ERROR;
1164 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1169 * We don't allow resumption in a backwards compatible ClientHello.
1170 * TODO(openssl-team): in TLS1.1+, session_id MUST be empty.
1172 * Versions before 0.9.7 always allow clients to resume sessions in
1173 * renegotiation. 0.9.7 and later allow this by default, but optionally
1174 * ignore resumption requests with flag
1175 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1176 * than a change to default behavior so that applications relying on
1177 * this for security won't even compile against older library versions).
1178 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to
1179 * request renegotiation but not a new session (s->new_session remains
1180 * unset): for servers, this essentially just means that the
1181 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be
1184 if (clienthello.isv2 ||
1186 (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) {
1187 if (!ssl_get_new_session(s, 1))
1190 i = ssl_get_prev_session(s, &clienthello);
1192 * Only resume if the session's version matches the negotiated
1194 * RFC 5246 does not provide much useful advice on resumption
1195 * with a different protocol version. It doesn't forbid it but
1196 * the sanity of such behaviour would be questionable.
1197 * In practice, clients do not accept a version mismatch and
1198 * will abort the handshake with an error.
1200 if (i == 1 && s->version == s->session->ssl_version) {
1201 /* previous session */
1203 } else if (i == -1) {
1207 if (!ssl_get_new_session(s, 1))
1212 if (ssl_bytes_to_cipher_list(s, &clienthello.ciphersuites, &ciphers,
1213 clienthello.isv2, &al) == NULL) {
1217 /* If it is a hit, check that the cipher is in the list */
1220 id = s->session->cipher->id;
1223 fprintf(stderr, "client sent %d ciphers\n", sk_SSL_CIPHER_num(ciphers));
1225 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
1226 c = sk_SSL_CIPHER_value(ciphers, i);
1228 fprintf(stderr, "client [%2d of %2d]:%s\n",
1229 i, sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c));
1238 * we need to have the cipher in the cipher list if we are asked
1241 al = SSL_AD_ILLEGAL_PARAMETER;
1242 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1243 SSL_R_REQUIRED_CIPHER_MISSING);
1248 for (loop = 0; loop < clienthello.compressions_len; loop++) {
1249 if (clienthello.compressions[loop] == 0)
1253 if (loop >= clienthello.compressions_len) {
1255 al = SSL_AD_DECODE_ERROR;
1256 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_COMPRESSION_SPECIFIED);
1260 /* TLS extensions */
1261 if (!ssl_parse_clienthello_tlsext(s, &clienthello)) {
1262 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_PARSE_TLSEXT);
1266 /* Check we've got a key_share for TLSv1.3 */
1267 if (s->version == TLS1_3_VERSION && s->s3->peer_tmp == NULL) {
1268 /* No suitable share */
1269 /* TODO(1.3): Send a HelloRetryRequest */
1270 al = SSL_AD_HANDSHAKE_FAILURE;
1271 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_SUITABLE_KEY_SHARE);
1276 * Check if we want to use external pre-shared secret for this handshake
1277 * for not reused session only. We need to generate server_random before
1278 * calling tls_session_secret_cb in order to allow SessionTicket
1279 * processing to use it in key derivation.
1283 pos = s->s3->server_random;
1284 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0) {
1289 if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb) {
1290 const SSL_CIPHER *pref_cipher = NULL;
1292 * s->session->master_key_length is a size_t, but this is an int for
1293 * backwards compat reasons
1295 int master_key_length;
1297 master_key_length = sizeof(s->session->master_key);
1298 if (s->tls_session_secret_cb(s, s->session->master_key,
1299 &master_key_length, ciphers,
1301 s->tls_session_secret_cb_arg)
1302 && master_key_length > 0) {
1303 s->session->master_key_length = master_key_length;
1305 s->session->ciphers = ciphers;
1306 s->session->verify_result = X509_V_OK;
1310 /* check if some cipher was preferred by call back */
1312 pref_cipher ? pref_cipher : ssl3_choose_cipher(s,
1317 if (pref_cipher == NULL) {
1318 al = SSL_AD_HANDSHAKE_FAILURE;
1319 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER);
1323 s->session->cipher = pref_cipher;
1324 sk_SSL_CIPHER_free(s->cipher_list);
1325 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1326 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1327 s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1332 * Worst case, we will use the NULL compression, but if we have other
1333 * options, we will now look for them. We have complen-1 compression
1334 * algorithms from the client, starting at q.
1336 s->s3->tmp.new_compression = NULL;
1337 #ifndef OPENSSL_NO_COMP
1338 /* This only happens if we have a cache hit */
1339 if (s->session->compress_meth != 0) {
1340 int m, comp_id = s->session->compress_meth;
1342 /* Perform sanity checks on resumed compression algorithm */
1343 /* Can't disable compression */
1344 if (!ssl_allow_compression(s)) {
1345 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1346 SSL_R_INCONSISTENT_COMPRESSION);
1349 /* Look for resumed compression method */
1350 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) {
1351 comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
1352 if (comp_id == comp->id) {
1353 s->s3->tmp.new_compression = comp;
1357 if (s->s3->tmp.new_compression == NULL) {
1358 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1359 SSL_R_INVALID_COMPRESSION_ALGORITHM);
1362 /* Look for resumed method in compression list */
1363 for (k = 0; k < clienthello.compressions_len; k++) {
1364 if (clienthello.compressions[k] == comp_id)
1367 if (k >= clienthello.compressions_len) {
1368 al = SSL_AD_ILLEGAL_PARAMETER;
1369 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
1370 SSL_R_REQUIRED_COMPRESSION_ALGORITHM_MISSING);
1375 else if (ssl_allow_compression(s) && s->ctx->comp_methods) {
1376 /* See if we have a match */
1377 int m, nn, v, done = 0;
1380 nn = sk_SSL_COMP_num(s->ctx->comp_methods);
1381 for (m = 0; m < nn; m++) {
1382 comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
1384 for (o = 0; o < clienthello.compressions_len; o++) {
1385 if (v == clienthello.compressions[o]) {
1394 s->s3->tmp.new_compression = comp;
1400 * If compression is disabled we'd better not try to resume a session
1401 * using compression.
1403 if (s->session->compress_meth != 0) {
1404 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_INCONSISTENT_COMPRESSION);
1410 * Given s->session->ciphers and SSL_get_ciphers, we must pick a cipher
1414 #ifdef OPENSSL_NO_COMP
1415 s->session->compress_meth = 0;
1417 s->session->compress_meth = (comp == NULL) ? 0 : comp->id;
1419 sk_SSL_CIPHER_free(s->session->ciphers);
1420 s->session->ciphers = ciphers;
1421 if (ciphers == NULL) {
1422 al = SSL_AD_INTERNAL_ERROR;
1423 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
1427 if (!tls1_set_server_sigalgs(s)) {
1428 SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1433 sk_SSL_CIPHER_free(ciphers);
1434 OPENSSL_free(clienthello.pre_proc_exts);
1435 return MSG_PROCESS_CONTINUE_PROCESSING;
1437 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1439 ossl_statem_set_error(s);
1441 sk_SSL_CIPHER_free(ciphers);
1442 OPENSSL_free(clienthello.pre_proc_exts);
1444 return MSG_PROCESS_ERROR;
1447 WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst)
1449 int al = SSL_AD_HANDSHAKE_FAILURE;
1450 const SSL_CIPHER *cipher;
1452 if (wst == WORK_MORE_A) {
1454 /* Let cert callback update server certificates if required */
1455 if (s->cert->cert_cb) {
1456 int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
1458 al = SSL_AD_INTERNAL_ERROR;
1459 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1460 SSL_R_CERT_CB_ERROR);
1464 s->rwstate = SSL_X509_LOOKUP;
1467 s->rwstate = SSL_NOTHING;
1470 ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1472 if (cipher == NULL) {
1473 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1474 SSL_R_NO_SHARED_CIPHER);
1477 s->s3->tmp.new_cipher = cipher;
1478 /* check whether we should disable session resumption */
1479 if (s->not_resumable_session_cb != NULL)
1480 s->session->not_resumable = s->not_resumable_session_cb(s,
1481 ((cipher->algorithm_mkey & (SSL_kDHE | SSL_kECDHE)) != 0));
1482 if (s->session->not_resumable)
1483 /* do not send a session ticket */
1484 s->tlsext_ticket_expected = 0;
1486 /* Session-id reuse */
1487 s->s3->tmp.new_cipher = s->session->cipher;
1490 if (!(s->verify_mode & SSL_VERIFY_PEER)) {
1491 if (!ssl3_digest_cached_records(s, 0)) {
1492 al = SSL_AD_INTERNAL_ERROR;
1498 * we now have the following setup.
1500 * cipher_list - our preferred list of ciphers
1501 * ciphers - the clients preferred list of ciphers
1502 * compression - basically ignored right now
1503 * ssl version is set - sslv3
1504 * s->session - The ssl session has been setup.
1505 * s->hit - session reuse flag
1506 * s->s3->tmp.new_cipher- the new cipher to use.
1509 /* Handles TLS extensions that we couldn't check earlier */
1510 if (s->version >= SSL3_VERSION) {
1511 if (!ssl_check_clienthello_tlsext_late(s, &al)) {
1512 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1513 SSL_R_CLIENTHELLO_TLSEXT);
1520 #ifndef OPENSSL_NO_SRP
1521 if (wst == WORK_MORE_B) {
1523 if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) {
1525 * callback indicates further work to be done
1527 s->rwstate = SSL_X509_LOOKUP;
1530 if (ret != SSL_ERROR_NONE) {
1532 * This is not really an error but the only means to for
1533 * a client to detect whether srp is supported.
1535 if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
1536 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1537 SSL_R_CLIENTHELLO_TLSEXT);
1539 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
1540 SSL_R_PSK_IDENTITY_NOT_FOUND);
1547 return WORK_FINISHED_STOP;
1549 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1550 ossl_statem_set_error(s);
1554 int tls_construct_server_hello(SSL *s, WPACKET *pkt)
1556 int compm, al = SSL_AD_INTERNAL_ERROR;
1560 /* TODO(TLS1.3): Remove the DRAFT conditional before release */
1561 version = SSL_IS_TLS13(s) ? TLS1_3_VERSION_DRAFT : s->version;
1562 if (!WPACKET_put_bytes_u16(pkt, version)
1564 * Random stuff. Filling of the server_random takes place in
1565 * tls_process_client_hello()
1567 || !WPACKET_memcpy(pkt, s->s3->server_random, SSL3_RANDOM_SIZE)) {
1568 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1573 * There are several cases for the session ID to send
1574 * back in the server hello:
1575 * - For session reuse from the session cache,
1576 * we send back the old session ID.
1577 * - If stateless session reuse (using a session ticket)
1578 * is successful, we send back the client's "session ID"
1579 * (which doesn't actually identify the session).
1580 * - If it is a new session, we send back the new
1582 * - However, if we want the new session to be single-use,
1583 * we send back a 0-length session ID.
1584 * s->hit is non-zero in either case of session reuse,
1585 * so the following won't overwrite an ID that we're supposed
1588 if (s->session->not_resumable ||
1589 (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1591 s->session->session_id_length = 0;
1593 sl = s->session->session_id_length;
1594 if (sl > sizeof(s->session->session_id)) {
1595 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1599 /* set up the compression method */
1600 #ifdef OPENSSL_NO_COMP
1603 if (s->s3->tmp.new_compression == NULL)
1606 compm = s->s3->tmp.new_compression->id;
1609 if (!WPACKET_sub_memcpy_u8(pkt, s->session->session_id, sl)
1610 || !s->method->put_cipher_by_char(s->s3->tmp.new_cipher, pkt, &len)
1611 || !WPACKET_put_bytes_u8(pkt, compm)
1612 || !ssl_prepare_serverhello_tlsext(s)
1613 || !ssl_add_serverhello_tlsext(s, pkt, &al)) {
1614 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1620 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
1624 int tls_construct_server_done(SSL *s, WPACKET *pkt)
1626 if (!s->s3->tmp.cert_request) {
1627 if (!ssl3_digest_cached_records(s, 0)) {
1628 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
1635 int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt)
1637 #ifndef OPENSSL_NO_DH
1638 EVP_PKEY *pkdh = NULL;
1640 #ifndef OPENSSL_NO_EC
1641 unsigned char *encodedPoint = NULL;
1642 size_t encodedlen = 0;
1646 const EVP_MD *md = NULL;
1647 int al = SSL_AD_INTERNAL_ERROR, i;
1650 EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
1651 size_t paramlen, paramoffset;
1653 if (!WPACKET_get_total_written(pkt, ¶moffset)) {
1654 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1658 if (md_ctx == NULL) {
1659 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1663 type = s->s3->tmp.new_cipher->algorithm_mkey;
1665 r[0] = r[1] = r[2] = r[3] = NULL;
1666 #ifndef OPENSSL_NO_PSK
1667 /* Plain PSK or RSAPSK nothing to do */
1668 if (type & (SSL_kPSK | SSL_kRSAPSK)) {
1670 #endif /* !OPENSSL_NO_PSK */
1671 #ifndef OPENSSL_NO_DH
1672 if (type & (SSL_kDHE | SSL_kDHEPSK)) {
1673 CERT *cert = s->cert;
1675 EVP_PKEY *pkdhp = NULL;
1678 if (s->cert->dh_tmp_auto) {
1679 DH *dhp = ssl_get_auto_dh(s);
1680 pkdh = EVP_PKEY_new();
1681 if (pkdh == NULL || dhp == NULL) {
1683 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1684 ERR_R_INTERNAL_ERROR);
1687 EVP_PKEY_assign_DH(pkdh, dhp);
1690 pkdhp = cert->dh_tmp;
1692 if ((pkdhp == NULL) && (s->cert->dh_tmp_cb != NULL)) {
1693 DH *dhp = s->cert->dh_tmp_cb(s, 0, 1024);
1694 pkdh = ssl_dh_to_pkey(dhp);
1696 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1697 ERR_R_INTERNAL_ERROR);
1702 if (pkdhp == NULL) {
1703 al = SSL_AD_HANDSHAKE_FAILURE;
1704 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1705 SSL_R_MISSING_TMP_DH_KEY);
1708 if (!ssl_security(s, SSL_SECOP_TMP_DH,
1709 EVP_PKEY_security_bits(pkdhp), 0, pkdhp)) {
1710 al = SSL_AD_HANDSHAKE_FAILURE;
1711 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1712 SSL_R_DH_KEY_TOO_SMALL);
1715 if (s->s3->tmp.pkey != NULL) {
1716 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1717 ERR_R_INTERNAL_ERROR);
1721 s->s3->tmp.pkey = ssl_generate_pkey(pkdhp);
1723 if (s->s3->tmp.pkey == NULL) {
1724 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB);
1728 dh = EVP_PKEY_get0_DH(s->s3->tmp.pkey);
1730 EVP_PKEY_free(pkdh);
1733 DH_get0_pqg(dh, &r[0], NULL, &r[1]);
1734 DH_get0_key(dh, &r[2], NULL);
1737 #ifndef OPENSSL_NO_EC
1738 if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
1741 if (s->s3->tmp.pkey != NULL) {
1742 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1743 ERR_R_INTERNAL_ERROR);
1747 /* Get NID of appropriate shared curve */
1748 nid = tls1_shared_group(s, -2);
1749 curve_id = tls1_ec_nid2curve_id(nid);
1750 if (curve_id == 0) {
1751 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1752 SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1755 s->s3->tmp.pkey = ssl_generate_pkey_curve(curve_id);
1756 /* Generate a new key for this curve */
1757 if (s->s3->tmp.pkey == NULL) {
1758 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB);
1762 /* Encode the public key. */
1763 encodedlen = EVP_PKEY_get1_tls_encodedpoint(s->s3->tmp.pkey,
1765 if (encodedlen == 0) {
1766 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EC_LIB);
1771 * We'll generate the serverKeyExchange message explicitly so we
1772 * can set these to NULLs
1779 #endif /* !OPENSSL_NO_EC */
1780 #ifndef OPENSSL_NO_SRP
1781 if (type & SSL_kSRP) {
1782 if ((s->srp_ctx.N == NULL) ||
1783 (s->srp_ctx.g == NULL) ||
1784 (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) {
1785 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1786 SSL_R_MISSING_SRP_PARAM);
1789 r[0] = s->srp_ctx.N;
1790 r[1] = s->srp_ctx.g;
1791 r[2] = s->srp_ctx.s;
1792 r[3] = s->srp_ctx.B;
1796 al = SSL_AD_HANDSHAKE_FAILURE;
1797 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1798 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1802 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP))
1803 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) {
1804 if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, &md))
1806 al = SSL_AD_DECODE_ERROR;
1813 #ifndef OPENSSL_NO_PSK
1814 if (type & SSL_PSK) {
1815 size_t len = (s->cert->psk_identity_hint == NULL)
1816 ? 0 : strlen(s->cert->psk_identity_hint);
1819 * It should not happen that len > PSK_MAX_IDENTITY_LEN - we already
1820 * checked this when we set the identity hint - but just in case
1822 if (len > PSK_MAX_IDENTITY_LEN
1823 || !WPACKET_sub_memcpy_u16(pkt, s->cert->psk_identity_hint,
1825 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1826 ERR_R_INTERNAL_ERROR);
1832 for (i = 0; i < 4 && r[i] != NULL; i++) {
1833 unsigned char *binval;
1836 #ifndef OPENSSL_NO_SRP
1837 if ((i == 2) && (type & SSL_kSRP)) {
1838 res = WPACKET_start_sub_packet_u8(pkt);
1841 res = WPACKET_start_sub_packet_u16(pkt);
1844 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1845 ERR_R_INTERNAL_ERROR);
1849 #ifndef OPENSSL_NO_DH
1851 * for interoperability with some versions of the Microsoft TLS
1852 * stack, we need to zero pad the DHE pub key to the same length
1855 if ((i == 2) && (type & (SSL_kDHE | SSL_kDHEPSK))) {
1856 size_t len = BN_num_bytes(r[0]) - BN_num_bytes(r[2]);
1859 if (!WPACKET_allocate_bytes(pkt, len, &binval)) {
1860 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1861 ERR_R_INTERNAL_ERROR);
1864 memset(binval, 0, len);
1868 if (!WPACKET_allocate_bytes(pkt, BN_num_bytes(r[i]), &binval)
1869 || !WPACKET_close(pkt)) {
1870 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1871 ERR_R_INTERNAL_ERROR);
1875 BN_bn2bin(r[i], binval);
1878 #ifndef OPENSSL_NO_EC
1879 if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
1881 * We only support named (not generic) curves. In this situation, the
1882 * ServerKeyExchange message has: [1 byte CurveType], [2 byte CurveName]
1883 * [1 byte length of encoded point], followed by the actual encoded
1886 if (!WPACKET_put_bytes_u8(pkt, NAMED_CURVE_TYPE)
1887 || !WPACKET_put_bytes_u8(pkt, 0)
1888 || !WPACKET_put_bytes_u8(pkt, curve_id)
1889 || !WPACKET_sub_memcpy_u8(pkt, encodedPoint, encodedlen)) {
1890 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1891 ERR_R_INTERNAL_ERROR);
1894 OPENSSL_free(encodedPoint);
1895 encodedPoint = NULL;
1902 * n is the length of the params, they start at &(d[4]) and p
1903 * points to the space at the end.
1906 unsigned char *sigbytes1, *sigbytes2;
1907 unsigned int siglen;
1909 /* Get length of the parameters we have written above */
1910 if (!WPACKET_get_length(pkt, ¶mlen)) {
1911 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1912 ERR_R_INTERNAL_ERROR);
1915 /* send signature algorithm */
1916 if (SSL_USE_SIGALGS(s)) {
1917 if (!tls12_get_sigandhash(pkt, pkey, md)) {
1918 /* Should never happen */
1919 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1920 ERR_R_INTERNAL_ERROR);
1925 fprintf(stderr, "Using hash %s\n", EVP_MD_name(md));
1928 * Create the signature. We don't know the actual length of the sig
1929 * until after we've created it, so we reserve enough bytes for it
1930 * up front, and then properly allocate them in the WPACKET
1933 if (!WPACKET_sub_reserve_bytes_u16(pkt, EVP_PKEY_size(pkey),
1935 || EVP_SignInit_ex(md_ctx, md, NULL) <= 0
1936 || EVP_SignUpdate(md_ctx, &(s->s3->client_random[0]),
1937 SSL3_RANDOM_SIZE) <= 0
1938 || EVP_SignUpdate(md_ctx, &(s->s3->server_random[0]),
1939 SSL3_RANDOM_SIZE) <= 0
1940 || EVP_SignUpdate(md_ctx, s->init_buf->data + paramoffset,
1942 || EVP_SignFinal(md_ctx, sigbytes1, &siglen, pkey) <= 0
1943 || !WPACKET_sub_allocate_bytes_u16(pkt, siglen, &sigbytes2)
1944 || sigbytes1 != sigbytes2) {
1945 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1946 ERR_R_INTERNAL_ERROR);
1950 /* Is this error check actually needed? */
1951 al = SSL_AD_HANDSHAKE_FAILURE;
1952 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
1953 SSL_R_UNKNOWN_PKEY_TYPE);
1958 EVP_MD_CTX_free(md_ctx);
1961 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1963 #ifndef OPENSSL_NO_DH
1964 EVP_PKEY_free(pkdh);
1966 #ifndef OPENSSL_NO_EC
1967 OPENSSL_free(encodedPoint);
1969 EVP_MD_CTX_free(md_ctx);
1973 int tls_construct_certificate_request(SSL *s, WPACKET *pkt)
1976 STACK_OF(X509_NAME) *sk = NULL;
1978 /* get the list of acceptable cert types */
1979 if (!WPACKET_start_sub_packet_u8(pkt)
1980 || !ssl3_get_req_cert_type(s, pkt)
1981 || !WPACKET_close(pkt)) {
1982 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);
1986 if (SSL_USE_SIGALGS(s)) {
1987 const unsigned char *psigs;
1988 size_t nl = tls12_get_psigalgs(s, &psigs);
1989 if (!WPACKET_start_sub_packet_u16(pkt)
1990 || !tls12_copy_sigalgs(s, pkt, psigs, nl)
1991 || !WPACKET_close(pkt)) {
1992 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,
1993 ERR_R_INTERNAL_ERROR);
1998 /* Start sub-packet for client CA list */
1999 if (!WPACKET_start_sub_packet_u16(pkt)) {
2000 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);
2004 sk = SSL_get_client_CA_list(s);
2006 for (i = 0; i < sk_X509_NAME_num(sk); i++) {
2007 unsigned char *namebytes;
2008 X509_NAME *name = sk_X509_NAME_value(sk, i);
2012 || (namelen = i2d_X509_NAME(name, NULL)) < 0
2013 || !WPACKET_sub_allocate_bytes_u16(pkt, namelen,
2015 || i2d_X509_NAME(name, &namebytes) != namelen) {
2016 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,
2017 ERR_R_INTERNAL_ERROR);
2022 /* else no CA names */
2024 if (!WPACKET_close(pkt)) {
2025 SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);
2029 s->s3->tmp.cert_request = 1;
2033 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2037 static int tls_process_cke_psk_preamble(SSL *s, PACKET *pkt, int *al)
2039 #ifndef OPENSSL_NO_PSK
2040 unsigned char psk[PSK_MAX_PSK_LEN];
2042 PACKET psk_identity;
2044 if (!PACKET_get_length_prefixed_2(pkt, &psk_identity)) {
2045 *al = SSL_AD_DECODE_ERROR;
2046 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_LENGTH_MISMATCH);
2049 if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) {
2050 *al = SSL_AD_DECODE_ERROR;
2051 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_DATA_LENGTH_TOO_LONG);
2054 if (s->psk_server_callback == NULL) {
2055 *al = SSL_AD_INTERNAL_ERROR;
2056 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_PSK_NO_SERVER_CB);
2060 if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) {
2061 *al = SSL_AD_INTERNAL_ERROR;
2062 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
2066 psklen = s->psk_server_callback(s, s->session->psk_identity,
2069 if (psklen > PSK_MAX_PSK_LEN) {
2070 *al = SSL_AD_INTERNAL_ERROR;
2071 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
2073 } else if (psklen == 0) {
2075 * PSK related to the given identity not found
2077 *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
2078 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
2079 SSL_R_PSK_IDENTITY_NOT_FOUND);
2083 OPENSSL_free(s->s3->tmp.psk);
2084 s->s3->tmp.psk = OPENSSL_memdup(psk, psklen);
2085 OPENSSL_cleanse(psk, psklen);
2087 if (s->s3->tmp.psk == NULL) {
2088 *al = SSL_AD_INTERNAL_ERROR;
2089 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_MALLOC_FAILURE);
2093 s->s3->tmp.psklen = psklen;
2097 /* Should never happen */
2098 *al = SSL_AD_INTERNAL_ERROR;
2099 SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
2104 static int tls_process_cke_rsa(SSL *s, PACKET *pkt, int *al)
2106 #ifndef OPENSSL_NO_RSA
2107 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2109 unsigned char decrypt_good, version_good;
2110 size_t j, padding_len;
2111 PACKET enc_premaster;
2113 unsigned char *rsa_decrypt = NULL;
2116 rsa = EVP_PKEY_get0_RSA(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey);
2118 *al = SSL_AD_HANDSHAKE_FAILURE;
2119 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_MISSING_RSA_CERTIFICATE);
2123 /* SSLv3 and pre-standard DTLS omit the length bytes. */
2124 if (s->version == SSL3_VERSION || s->version == DTLS1_BAD_VER) {
2125 enc_premaster = *pkt;
2127 if (!PACKET_get_length_prefixed_2(pkt, &enc_premaster)
2128 || PACKET_remaining(pkt) != 0) {
2129 *al = SSL_AD_DECODE_ERROR;
2130 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_LENGTH_MISMATCH);
2136 * We want to be sure that the plaintext buffer size makes it safe to
2137 * iterate over the entire size of a premaster secret
2138 * (SSL_MAX_MASTER_KEY_LENGTH). Reject overly short RSA keys because
2139 * their ciphertext cannot accommodate a premaster secret anyway.
2141 if (RSA_size(rsa) < SSL_MAX_MASTER_KEY_LENGTH) {
2142 *al = SSL_AD_INTERNAL_ERROR;
2143 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, RSA_R_KEY_SIZE_TOO_SMALL);
2147 rsa_decrypt = OPENSSL_malloc(RSA_size(rsa));
2148 if (rsa_decrypt == NULL) {
2149 *al = SSL_AD_INTERNAL_ERROR;
2150 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_MALLOC_FAILURE);
2155 * We must not leak whether a decryption failure occurs because of
2156 * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246,
2157 * section 7.4.7.1). The code follows that advice of the TLS RFC and
2158 * generates a random premaster secret for the case that the decrypt
2159 * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1
2162 if (RAND_bytes(rand_premaster_secret, sizeof(rand_premaster_secret)) <= 0)
2166 * Decrypt with no padding. PKCS#1 padding will be removed as part of
2167 * the timing-sensitive code below.
2169 /* TODO(size_t): Convert this function */
2170 decrypt_len = (int)RSA_private_decrypt((int)PACKET_remaining(&enc_premaster),
2171 PACKET_data(&enc_premaster),
2172 rsa_decrypt, rsa, RSA_NO_PADDING);
2173 if (decrypt_len < 0)
2176 /* Check the padding. See RFC 3447, section 7.2.2. */
2179 * The smallest padded premaster is 11 bytes of overhead. Small keys
2180 * are publicly invalid, so this may return immediately. This ensures
2181 * PS is at least 8 bytes.
2183 if (decrypt_len < 11 + SSL_MAX_MASTER_KEY_LENGTH) {
2184 *al = SSL_AD_DECRYPT_ERROR;
2185 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_DECRYPTION_FAILED);
2189 padding_len = decrypt_len - SSL_MAX_MASTER_KEY_LENGTH;
2190 decrypt_good = constant_time_eq_int_8(rsa_decrypt[0], 0) &
2191 constant_time_eq_int_8(rsa_decrypt[1], 2);
2192 for (j = 2; j < padding_len - 1; j++) {
2193 decrypt_good &= ~constant_time_is_zero_8(rsa_decrypt[j]);
2195 decrypt_good &= constant_time_is_zero_8(rsa_decrypt[padding_len - 1]);
2198 * If the version in the decrypted pre-master secret is correct then
2199 * version_good will be 0xff, otherwise it'll be zero. The
2200 * Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2201 * (http://eprint.iacr.org/2003/052/) exploits the version number
2202 * check as a "bad version oracle". Thus version checks are done in
2203 * constant time and are treated like any other decryption error.
2206 constant_time_eq_8(rsa_decrypt[padding_len],
2207 (unsigned)(s->client_version >> 8));
2209 constant_time_eq_8(rsa_decrypt[padding_len + 1],
2210 (unsigned)(s->client_version & 0xff));
2213 * The premaster secret must contain the same version number as the
2214 * ClientHello to detect version rollback attacks (strangely, the
2215 * protocol does not offer such protection for DH ciphersuites).
2216 * However, buggy clients exist that send the negotiated protocol
2217 * version instead if the server does not support the requested
2218 * protocol version. If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such
2221 if (s->options & SSL_OP_TLS_ROLLBACK_BUG) {
2222 unsigned char workaround_good;
2223 workaround_good = constant_time_eq_8(rsa_decrypt[padding_len],
2224 (unsigned)(s->version >> 8));
2226 constant_time_eq_8(rsa_decrypt[padding_len + 1],
2227 (unsigned)(s->version & 0xff));
2228 version_good |= workaround_good;
2232 * Both decryption and version must be good for decrypt_good to
2233 * remain non-zero (0xff).
2235 decrypt_good &= version_good;
2238 * Now copy rand_premaster_secret over from p using
2239 * decrypt_good_mask. If decryption failed, then p does not
2240 * contain valid plaintext, however, a check above guarantees
2241 * it is still sufficiently large to read from.
2243 for (j = 0; j < sizeof(rand_premaster_secret); j++) {
2244 rsa_decrypt[padding_len + j] =
2245 constant_time_select_8(decrypt_good,
2246 rsa_decrypt[padding_len + j],
2247 rand_premaster_secret[j]);
2250 if (!ssl_generate_master_secret(s, rsa_decrypt + padding_len,
2251 sizeof(rand_premaster_secret), 0)) {
2252 *al = SSL_AD_INTERNAL_ERROR;
2253 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_INTERNAL_ERROR);
2259 OPENSSL_free(rsa_decrypt);
2262 /* Should never happen */
2263 *al = SSL_AD_INTERNAL_ERROR;
2264 SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_INTERNAL_ERROR);
2269 static int tls_process_cke_dhe(SSL *s, PACKET *pkt, int *al)
2271 #ifndef OPENSSL_NO_DH
2272 EVP_PKEY *skey = NULL;
2276 const unsigned char *data;
2277 EVP_PKEY *ckey = NULL;
2280 if (!PACKET_get_net_2(pkt, &i) || PACKET_remaining(pkt) != i) {
2281 *al = SSL_AD_HANDSHAKE_FAILURE;
2282 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE,
2283 SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2286 skey = s->s3->tmp.pkey;
2288 *al = SSL_AD_HANDSHAKE_FAILURE;
2289 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_MISSING_TMP_DH_KEY);
2293 if (PACKET_remaining(pkt) == 0L) {
2294 *al = SSL_AD_HANDSHAKE_FAILURE;
2295 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_MISSING_TMP_DH_KEY);
2298 if (!PACKET_get_bytes(pkt, &data, i)) {
2299 /* We already checked we have enough data */
2300 *al = SSL_AD_INTERNAL_ERROR;
2301 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
2304 ckey = EVP_PKEY_new();
2305 if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) == 0) {
2306 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_BN_LIB);
2309 cdh = EVP_PKEY_get0_DH(ckey);
2310 pub_key = BN_bin2bn(data, i, NULL);
2312 if (pub_key == NULL || !DH_set0_key(cdh, pub_key, NULL)) {
2313 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
2314 if (pub_key != NULL)
2319 if (ssl_derive(s, skey, ckey) == 0) {
2320 *al = SSL_AD_INTERNAL_ERROR;
2321 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
2326 EVP_PKEY_free(s->s3->tmp.pkey);
2327 s->s3->tmp.pkey = NULL;
2329 EVP_PKEY_free(ckey);
2332 /* Should never happen */
2333 *al = SSL_AD_INTERNAL_ERROR;
2334 SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
2339 static int tls_process_cke_ecdhe(SSL *s, PACKET *pkt, int *al)
2341 #ifndef OPENSSL_NO_EC
2342 EVP_PKEY *skey = s->s3->tmp.pkey;
2343 EVP_PKEY *ckey = NULL;
2346 if (PACKET_remaining(pkt) == 0L) {
2347 /* We don't support ECDH client auth */
2348 *al = SSL_AD_HANDSHAKE_FAILURE;
2349 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, SSL_R_MISSING_TMP_ECDH_KEY);
2353 const unsigned char *data;
2356 * Get client's public key from encoded point in the
2357 * ClientKeyExchange message.
2360 /* Get encoded point length */
2361 if (!PACKET_get_1(pkt, &i) || !PACKET_get_bytes(pkt, &data, i)
2362 || PACKET_remaining(pkt) != 0) {
2363 *al = SSL_AD_DECODE_ERROR;
2364 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, SSL_R_LENGTH_MISMATCH);
2367 ckey = EVP_PKEY_new();
2368 if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) <= 0) {
2369 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_EVP_LIB);
2372 if (EVP_PKEY_set1_tls_encodedpoint(ckey, data, i) == 0) {
2373 *al = SSL_AD_HANDSHAKE_FAILURE;
2374 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_EC_LIB);
2379 if (ssl_derive(s, skey, ckey) == 0) {
2380 *al = SSL_AD_INTERNAL_ERROR;
2381 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_INTERNAL_ERROR);
2386 EVP_PKEY_free(s->s3->tmp.pkey);
2387 s->s3->tmp.pkey = NULL;
2389 EVP_PKEY_free(ckey);
2393 /* Should never happen */
2394 *al = SSL_AD_INTERNAL_ERROR;
2395 SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_INTERNAL_ERROR);
2400 static int tls_process_cke_srp(SSL *s, PACKET *pkt, int *al)
2402 #ifndef OPENSSL_NO_SRP
2404 const unsigned char *data;
2406 if (!PACKET_get_net_2(pkt, &i)
2407 || !PACKET_get_bytes(pkt, &data, i)) {
2408 *al = SSL_AD_DECODE_ERROR;
2409 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, SSL_R_BAD_SRP_A_LENGTH);
2412 if ((s->srp_ctx.A = BN_bin2bn(data, i, NULL)) == NULL) {
2413 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_BN_LIB);
2416 if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0 || BN_is_zero(s->srp_ctx.A)) {
2417 *al = SSL_AD_ILLEGAL_PARAMETER;
2418 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, SSL_R_BAD_SRP_PARAMETERS);
2421 OPENSSL_free(s->session->srp_username);
2422 s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login);
2423 if (s->session->srp_username == NULL) {
2424 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_MALLOC_FAILURE);
2428 if (!srp_generate_server_master_secret(s)) {
2429 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_INTERNAL_ERROR);
2435 /* Should never happen */
2436 *al = SSL_AD_INTERNAL_ERROR;
2437 SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_INTERNAL_ERROR);
2442 static int tls_process_cke_gost(SSL *s, PACKET *pkt, int *al)
2444 #ifndef OPENSSL_NO_GOST
2445 EVP_PKEY_CTX *pkey_ctx;
2446 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2447 unsigned char premaster_secret[32];
2448 const unsigned char *start;
2449 size_t outlen = 32, inlen;
2450 unsigned long alg_a;
2453 size_t sess_key_len;
2454 const unsigned char *data;
2457 /* Get our certificate private key */
2458 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2459 if (alg_a & SSL_aGOST12) {
2461 * New GOST ciphersuites have SSL_aGOST01 bit too
2463 pk = s->cert->pkeys[SSL_PKEY_GOST12_512].privatekey;
2465 pk = s->cert->pkeys[SSL_PKEY_GOST12_256].privatekey;
2468 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2470 } else if (alg_a & SSL_aGOST01) {
2471 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2474 pkey_ctx = EVP_PKEY_CTX_new(pk, NULL);
2475 if (pkey_ctx == NULL) {
2476 *al = SSL_AD_INTERNAL_ERROR;
2477 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_MALLOC_FAILURE);
2480 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) {
2481 *al = SSL_AD_INTERNAL_ERROR;
2482 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
2486 * If client certificate is present and is of the same type, maybe
2487 * use it for key exchange. Don't mind errors from
2488 * EVP_PKEY_derive_set_peer, because it is completely valid to use a
2489 * client certificate for authorization only.
2491 client_pub_pkey = X509_get0_pubkey(s->session->peer);
2492 if (client_pub_pkey) {
2493 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2496 /* Decrypt session key */
2497 sess_key_len = PACKET_remaining(pkt);
2498 if (!PACKET_get_bytes(pkt, &data, sess_key_len)) {
2499 *al = SSL_AD_INTERNAL_ERROR;
2500 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
2503 /* TODO(size_t): Convert this function */
2504 if (ASN1_get_object((const unsigned char **)&data, &Tlen, &Ttag,
2505 &Tclass, (long)sess_key_len) != V_ASN1_CONSTRUCTED
2506 || Ttag != V_ASN1_SEQUENCE || Tclass != V_ASN1_UNIVERSAL) {
2507 *al = SSL_AD_DECODE_ERROR;
2508 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, SSL_R_DECRYPTION_FAILED);
2513 if (EVP_PKEY_decrypt
2514 (pkey_ctx, premaster_secret, &outlen, start, inlen) <= 0) {
2515 *al = SSL_AD_DECODE_ERROR;
2516 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, SSL_R_DECRYPTION_FAILED);
2519 /* Generate master secret */
2520 if (!ssl_generate_master_secret(s, premaster_secret,
2521 sizeof(premaster_secret), 0)) {
2522 *al = SSL_AD_INTERNAL_ERROR;
2523 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
2526 /* Check if pubkey from client certificate was used */
2527 if (EVP_PKEY_CTX_ctrl
2528 (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2529 s->statem.no_cert_verify = 1;
2533 EVP_PKEY_CTX_free(pkey_ctx);
2536 /* Should never happen */
2537 *al = SSL_AD_INTERNAL_ERROR;
2538 SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
2543 MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt)
2546 unsigned long alg_k;
2548 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2550 /* For PSK parse and retrieve identity, obtain PSK key */
2551 if ((alg_k & SSL_PSK) && !tls_process_cke_psk_preamble(s, pkt, &al))
2554 if (alg_k & SSL_kPSK) {
2555 /* Identity extracted earlier: should be nothing left */
2556 if (PACKET_remaining(pkt) != 0) {
2557 al = SSL_AD_HANDSHAKE_FAILURE;
2558 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
2559 SSL_R_LENGTH_MISMATCH);
2562 /* PSK handled by ssl_generate_master_secret */
2563 if (!ssl_generate_master_secret(s, NULL, 0, 0)) {
2564 al = SSL_AD_INTERNAL_ERROR;
2565 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2568 } else if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) {
2569 if (!tls_process_cke_rsa(s, pkt, &al))
2571 } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) {
2572 if (!tls_process_cke_dhe(s, pkt, &al))
2574 } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) {
2575 if (!tls_process_cke_ecdhe(s, pkt, &al))
2577 } else if (alg_k & SSL_kSRP) {
2578 if (!tls_process_cke_srp(s, pkt, &al))
2580 } else if (alg_k & SSL_kGOST) {
2581 if (!tls_process_cke_gost(s, pkt, &al))
2584 al = SSL_AD_HANDSHAKE_FAILURE;
2585 SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
2586 SSL_R_UNKNOWN_CIPHER_TYPE);
2590 return MSG_PROCESS_CONTINUE_PROCESSING;
2593 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2594 #ifndef OPENSSL_NO_PSK
2595 OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen);
2596 s->s3->tmp.psk = NULL;
2598 ossl_statem_set_error(s);
2599 return MSG_PROCESS_ERROR;
2602 WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst)
2604 #ifndef OPENSSL_NO_SCTP
2605 if (wst == WORK_MORE_A) {
2606 if (SSL_IS_DTLS(s)) {
2607 unsigned char sctpauthkey[64];
2608 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
2610 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
2613 memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
2614 sizeof(DTLS1_SCTP_AUTH_LABEL));
2616 if (SSL_export_keying_material(s, sctpauthkey,
2617 sizeof(sctpauthkey), labelbuffer,
2618 sizeof(labelbuffer), NULL, 0,
2620 ossl_statem_set_error(s);
2624 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
2625 sizeof(sctpauthkey), sctpauthkey);
2630 if ((wst == WORK_MORE_B)
2632 && BIO_dgram_is_sctp(SSL_get_wbio(s))
2633 /* Are we renegotiating? */
2635 /* Are we going to skip the CertificateVerify? */
2636 && (s->session->peer == NULL || s->statem.no_cert_verify)
2637 && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
2638 s->s3->in_read_app_data = 2;
2639 s->rwstate = SSL_READING;
2640 BIO_clear_retry_flags(SSL_get_rbio(s));
2641 BIO_set_retry_read(SSL_get_rbio(s));
2642 ossl_statem_set_sctp_read_sock(s, 1);
2645 ossl_statem_set_sctp_read_sock(s, 0);
2649 if (s->statem.no_cert_verify || !s->session->peer) {
2651 * No certificate verify or no peer certificate so we no longer need
2652 * the handshake_buffer
2654 if (!ssl3_digest_cached_records(s, 0)) {
2655 ossl_statem_set_error(s);
2658 return WORK_FINISHED_CONTINUE;
2660 if (!s->s3->handshake_buffer) {
2661 SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE,
2662 ERR_R_INTERNAL_ERROR);
2663 ossl_statem_set_error(s);
2667 * For sigalgs freeze the handshake buffer. If we support
2668 * extms we've done this already so this is a no-op
2670 if (!ssl3_digest_cached_records(s, 1)) {
2671 ossl_statem_set_error(s);
2676 return WORK_FINISHED_CONTINUE;
2679 MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt)
2681 EVP_PKEY *pkey = NULL;
2682 const unsigned char *sig, *data;
2683 #ifndef OPENSSL_NO_GOST
2684 unsigned char *gost_data = NULL;
2686 int al, ret = MSG_PROCESS_ERROR;
2690 const EVP_MD *md = NULL;
2694 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
2697 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE);
2698 al = SSL_AD_INTERNAL_ERROR;
2702 peer = s->session->peer;
2703 pkey = X509_get0_pubkey(peer);
2704 type = X509_certificate_type(peer, pkey);
2706 if (!(type & EVP_PKT_SIGN)) {
2707 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY,
2708 SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2709 al = SSL_AD_ILLEGAL_PARAMETER;
2713 /* Check for broken implementations of GOST ciphersuites */
2715 * If key is GOST and n is exactly 64, it is bare signature without
2716 * length field (CryptoPro implementations at least till CSP 4.0)
2718 #ifndef OPENSSL_NO_GOST
2719 if (PACKET_remaining(pkt) == 64
2720 && EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) {
2725 if (SSL_USE_SIGALGS(s)) {
2728 if (!PACKET_get_bytes(pkt, &sig, 2)) {
2729 al = SSL_AD_DECODE_ERROR;
2732 rv = tls12_check_peer_sigalg(&md, s, sig, pkey);
2734 al = SSL_AD_INTERNAL_ERROR;
2736 } else if (rv == 0) {
2737 al = SSL_AD_DECODE_ERROR;
2741 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
2744 /* Use default digest for this key type */
2745 int idx = ssl_cert_type(NULL, pkey);
2747 md = s->s3->tmp.md[idx];
2749 al = SSL_AD_INTERNAL_ERROR;
2754 if (!PACKET_get_net_2(pkt, &len)) {
2755 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);
2756 al = SSL_AD_DECODE_ERROR;
2760 j = EVP_PKEY_size(pkey);
2761 if (((int)len > j) || ((int)PACKET_remaining(pkt) > j)
2762 || (PACKET_remaining(pkt) == 0)) {
2763 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE);
2764 al = SSL_AD_DECODE_ERROR;
2767 if (!PACKET_get_bytes(pkt, &data, len)) {
2768 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);
2769 al = SSL_AD_DECODE_ERROR;
2773 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
2774 if (hdatalen <= 0) {
2775 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
2776 al = SSL_AD_INTERNAL_ERROR;
2780 fprintf(stderr, "Using client verify alg %s\n", EVP_MD_name(md));
2782 if (!EVP_VerifyInit_ex(mctx, md, NULL)
2783 || !EVP_VerifyUpdate(mctx, hdata, hdatalen)) {
2784 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB);
2785 al = SSL_AD_INTERNAL_ERROR;
2788 #ifndef OPENSSL_NO_GOST
2790 int pktype = EVP_PKEY_id(pkey);
2791 if (pktype == NID_id_GostR3410_2001
2792 || pktype == NID_id_GostR3410_2012_256
2793 || pktype == NID_id_GostR3410_2012_512) {
2794 if ((gost_data = OPENSSL_malloc(len)) == NULL) {
2795 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE);
2796 al = SSL_AD_INTERNAL_ERROR;
2799 BUF_reverse(gost_data, data, len);
2805 if (s->version == SSL3_VERSION
2806 && !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET,
2807 (int)s->session->master_key_length,
2808 s->session->master_key)) {
2809 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB);
2810 al = SSL_AD_INTERNAL_ERROR;
2814 if (EVP_VerifyFinal(mctx, data, len, pkey) <= 0) {
2815 al = SSL_AD_DECRYPT_ERROR;
2816 SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE);
2820 ret = MSG_PROCESS_CONTINUE_PROCESSING;
2823 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2824 ossl_statem_set_error(s);
2826 BIO_free(s->s3->handshake_buffer);
2827 s->s3->handshake_buffer = NULL;
2828 EVP_MD_CTX_free(mctx);
2829 #ifndef OPENSSL_NO_GOST
2830 OPENSSL_free(gost_data);
2835 MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt)
2837 int i, al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR;
2839 unsigned long l, llen;
2840 const unsigned char *certstart, *certbytes;
2841 STACK_OF(X509) *sk = NULL;
2844 if ((sk = sk_X509_new_null()) == NULL) {
2845 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2849 if (!PACKET_get_net_3(pkt, &llen)
2850 || !PACKET_get_sub_packet(pkt, &spkt, llen)
2851 || PACKET_remaining(pkt) != 0) {
2852 al = SSL_AD_DECODE_ERROR;
2853 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
2857 while (PACKET_remaining(&spkt) > 0) {
2858 if (!PACKET_get_net_3(&spkt, &l)
2859 || !PACKET_get_bytes(&spkt, &certbytes, l)) {
2860 al = SSL_AD_DECODE_ERROR;
2861 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
2862 SSL_R_CERT_LENGTH_MISMATCH);
2866 certstart = certbytes;
2867 x = d2i_X509(NULL, (const unsigned char **)&certbytes, l);
2869 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB);
2872 if (certbytes != (certstart + l)) {
2873 al = SSL_AD_DECODE_ERROR;
2874 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
2875 SSL_R_CERT_LENGTH_MISMATCH);
2878 if (!sk_X509_push(sk, x)) {
2879 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2885 if (sk_X509_num(sk) <= 0) {
2886 /* TLS does not mind 0 certs returned */
2887 if (s->version == SSL3_VERSION) {
2888 al = SSL_AD_HANDSHAKE_FAILURE;
2889 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
2890 SSL_R_NO_CERTIFICATES_RETURNED);
2893 /* Fail for TLS only if we required a certificate */
2894 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2895 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
2896 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
2897 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2898 al = SSL_AD_HANDSHAKE_FAILURE;
2901 /* No client certificate so digest cached records */
2902 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) {
2907 i = ssl_verify_cert_chain(s, sk);
2909 al = ssl_verify_alarm_type(s->verify_result);
2910 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
2911 SSL_R_CERTIFICATE_VERIFY_FAILED);
2915 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i);
2916 al = SSL_AD_HANDSHAKE_FAILURE;
2919 pkey = X509_get0_pubkey(sk_X509_value(sk, 0));
2921 al = SSL3_AD_HANDSHAKE_FAILURE;
2922 SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
2923 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
2928 X509_free(s->session->peer);
2929 s->session->peer = sk_X509_shift(sk);
2930 s->session->verify_result = s->verify_result;
2932 sk_X509_pop_free(s->session->peer_chain, X509_free);
2933 s->session->peer_chain = sk;
2935 * Inconsistency alert: cert_chain does *not* include the peer's own
2936 * certificate, while we do include it in statem_clnt.c
2939 ret = MSG_PROCESS_CONTINUE_READING;
2943 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2944 ossl_statem_set_error(s);
2947 sk_X509_pop_free(sk, X509_free);
2951 int tls_construct_server_certificate(SSL *s, WPACKET *pkt)
2955 cpk = ssl_get_server_send_pkey(s);
2957 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
2961 if (!ssl3_output_cert_chain(s, pkt, cpk)) {
2962 SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
2969 int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt)
2971 unsigned char *senc = NULL;
2972 EVP_CIPHER_CTX *ctx = NULL;
2973 HMAC_CTX *hctx = NULL;
2974 unsigned char *p, *encdata1, *encdata2, *macdata1, *macdata2;
2975 const unsigned char *const_p;
2976 int len, slen_full, slen, lenfinal;
2979 SSL_CTX *tctx = s->initial_ctx;
2980 unsigned char iv[EVP_MAX_IV_LENGTH];
2981 unsigned char key_name[TLSEXT_KEYNAME_LENGTH];
2983 size_t macoffset, macendoffset;
2985 /* get session encoding length */
2986 slen_full = i2d_SSL_SESSION(s->session, NULL);
2988 * Some length values are 16 bits, so forget it if session is too
2991 if (slen_full == 0 || slen_full > 0xFF00) {
2992 ossl_statem_set_error(s);
2995 senc = OPENSSL_malloc(slen_full);
2997 ossl_statem_set_error(s);
3001 ctx = EVP_CIPHER_CTX_new();
3002 hctx = HMAC_CTX_new();
3003 if (ctx == NULL || hctx == NULL) {
3004 SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
3009 if (!i2d_SSL_SESSION(s->session, &p))
3013 * create a fresh copy (not shared with other threads) to clean up
3016 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3019 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3021 slen = i2d_SSL_SESSION(sess, NULL);
3022 if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */
3023 SSL_SESSION_free(sess);
3027 if (!i2d_SSL_SESSION(sess, &p)) {
3028 SSL_SESSION_free(sess);
3031 SSL_SESSION_free(sess);
3034 * Initialize HMAC and cipher contexts. If callback present it does
3035 * all the work otherwise use generated values from parent ctx.
3037 if (tctx->tlsext_ticket_key_cb) {
3038 /* if 0 is returned, write an empty ticket */
3039 int ret = tctx->tlsext_ticket_key_cb(s, key_name, iv, ctx,
3044 /* Put timeout and length */
3045 if (!WPACKET_put_bytes_u32(pkt, 0)
3046 || !WPACKET_put_bytes_u16(pkt, 0)) {
3047 SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET,
3048 ERR_R_INTERNAL_ERROR);
3052 EVP_CIPHER_CTX_free(ctx);
3053 HMAC_CTX_free(hctx);
3058 iv_len = EVP_CIPHER_CTX_iv_length(ctx);
3060 const EVP_CIPHER *cipher = EVP_aes_256_cbc();
3062 iv_len = EVP_CIPHER_iv_length(cipher);
3063 if (RAND_bytes(iv, iv_len) <= 0)
3065 if (!EVP_EncryptInit_ex(ctx, cipher, NULL,
3066 tctx->tlsext_tick_aes_key, iv))
3068 if (!HMAC_Init_ex(hctx, tctx->tlsext_tick_hmac_key,
3069 sizeof(tctx->tlsext_tick_hmac_key),
3070 EVP_sha256(), NULL))
3072 memcpy(key_name, tctx->tlsext_tick_key_name,
3073 sizeof(tctx->tlsext_tick_key_name));
3077 * Ticket lifetime hint (advisory only): We leave this unspecified
3078 * for resumed session (for simplicity), and guess that tickets for
3079 * new sessions will live as long as their sessions.
3081 if (!WPACKET_put_bytes_u32(pkt, s->hit ? 0 : s->session->timeout)
3082 /* Now the actual ticket data */
3083 || !WPACKET_start_sub_packet_u16(pkt)
3084 || !WPACKET_get_total_written(pkt, &macoffset)
3085 /* Output key name */
3086 || !WPACKET_memcpy(pkt, key_name, sizeof(key_name))
3088 || !WPACKET_memcpy(pkt, iv, iv_len)
3089 || !WPACKET_reserve_bytes(pkt, slen + EVP_MAX_BLOCK_LENGTH,
3091 /* Encrypt session data */
3092 || !EVP_EncryptUpdate(ctx, encdata1, &len, senc, slen)
3093 || !WPACKET_allocate_bytes(pkt, len, &encdata2)
3094 || encdata1 != encdata2
3095 || !EVP_EncryptFinal(ctx, encdata1 + len, &lenfinal)
3096 || !WPACKET_allocate_bytes(pkt, lenfinal, &encdata2)
3097 || encdata1 + len != encdata2
3098 || len + lenfinal > slen + EVP_MAX_BLOCK_LENGTH
3099 || !WPACKET_get_total_written(pkt, &macendoffset)
3100 || !HMAC_Update(hctx,
3101 (unsigned char *)s->init_buf->data + macoffset,
3102 macendoffset - macoffset)
3103 || !WPACKET_reserve_bytes(pkt, EVP_MAX_MD_SIZE, &macdata1)
3104 || !HMAC_Final(hctx, macdata1, &hlen)
3105 || hlen > EVP_MAX_MD_SIZE
3106 || !WPACKET_allocate_bytes(pkt, hlen, &macdata2)
3107 || macdata1 != macdata2
3108 || !WPACKET_close(pkt)) {
3109 SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET, ERR_R_INTERNAL_ERROR);
3112 EVP_CIPHER_CTX_free(ctx);
3113 HMAC_CTX_free(hctx);
3119 EVP_CIPHER_CTX_free(ctx);
3120 HMAC_CTX_free(hctx);
3121 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3125 int tls_construct_cert_status(SSL *s, WPACKET *pkt)
3127 if (!WPACKET_put_bytes_u8(pkt, s->tlsext_status_type)
3128 || !WPACKET_sub_memcpy_u24(pkt, s->tlsext_ocsp_resp,
3129 s->tlsext_ocsp_resplen)) {
3130 SSLerr(SSL_F_TLS_CONSTRUCT_CERT_STATUS, ERR_R_INTERNAL_ERROR);
3131 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3138 #ifndef OPENSSL_NO_NEXTPROTONEG
3140 * tls_process_next_proto reads a Next Protocol Negotiation handshake message.
3141 * It sets the next_proto member in s if found
3143 MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt)
3145 PACKET next_proto, padding;
3146 size_t next_proto_len;
3149 * The payload looks like:
3151 * uint8 proto[proto_len];
3152 * uint8 padding_len;
3153 * uint8 padding[padding_len];
3155 if (!PACKET_get_length_prefixed_1(pkt, &next_proto)
3156 || !PACKET_get_length_prefixed_1(pkt, &padding)
3157 || PACKET_remaining(pkt) > 0) {
3158 SSLerr(SSL_F_TLS_PROCESS_NEXT_PROTO, SSL_R_LENGTH_MISMATCH);
3162 if (!PACKET_memdup(&next_proto, &s->next_proto_negotiated, &next_proto_len)) {
3163 s->next_proto_negotiated_len = 0;
3167 s->next_proto_negotiated_len = (unsigned char)next_proto_len;
3169 return MSG_PROCESS_CONTINUE_READING;
3171 ossl_statem_set_error(s);
3172 return MSG_PROCESS_ERROR;
3176 #define SSLV2_CIPHER_LEN 3
3178 STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,
3179 PACKET *cipher_suites,
3180 STACK_OF(SSL_CIPHER) **skp,
3181 int sslv2format, int *al)
3183 const SSL_CIPHER *c;
3184 STACK_OF(SSL_CIPHER) *sk;
3186 /* 3 = SSLV2_CIPHER_LEN > TLS_CIPHER_LEN = 2. */
3187 unsigned char cipher[SSLV2_CIPHER_LEN];
3189 s->s3->send_connection_binding = 0;
3191 n = sslv2format ? SSLV2_CIPHER_LEN : TLS_CIPHER_LEN;
3193 if (PACKET_remaining(cipher_suites) == 0) {
3194 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, SSL_R_NO_CIPHERS_SPECIFIED);
3195 *al = SSL_AD_ILLEGAL_PARAMETER;
3199 if (PACKET_remaining(cipher_suites) % n != 0) {
3200 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3201 SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
3202 *al = SSL_AD_DECODE_ERROR;
3206 if ((skp == NULL) || (*skp == NULL)) {
3207 sk = sk_SSL_CIPHER_new_null(); /* change perhaps later */
3209 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
3210 *al = SSL_AD_INTERNAL_ERROR;
3215 sk_SSL_CIPHER_zero(sk);
3218 if (!PACKET_memdup(cipher_suites, &s->s3->tmp.ciphers_raw,
3219 &s->s3->tmp.ciphers_rawlen)) {
3220 *al = SSL_AD_INTERNAL_ERROR;
3224 while (PACKET_copy_bytes(cipher_suites, cipher, n)) {
3226 * SSLv3 ciphers wrapped in an SSLv2-compatible ClientHello have the
3227 * first byte set to zero, while true SSLv2 ciphers have a non-zero
3228 * first byte. We don't support any true SSLv2 ciphers, so skip them.
3230 if (sslv2format && cipher[0] != '\0')
3233 /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */
3234 if ((cipher[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) &&
3235 (cipher[n - 1] == (SSL3_CK_SCSV & 0xff))) {
3236 /* SCSV fatal if renegotiating */
3237 if (s->renegotiate) {
3238 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3239 SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING);
3240 *al = SSL_AD_HANDSHAKE_FAILURE;
3243 s->s3->send_connection_binding = 1;
3247 /* Check for TLS_FALLBACK_SCSV */
3248 if ((cipher[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) &&
3249 (cipher[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) {
3251 * The SCSV indicates that the client previously tried a higher
3252 * version. Fail if the current version is an unexpected
3255 if (!ssl_check_version_downgrade(s)) {
3256 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3257 SSL_R_INAPPROPRIATE_FALLBACK);
3258 *al = SSL_AD_INAPPROPRIATE_FALLBACK;
3264 /* For SSLv2-compat, ignore leading 0-byte. */
3265 c = ssl_get_cipher_by_char(s, sslv2format ? &cipher[1] : cipher);
3267 if (!sk_SSL_CIPHER_push(sk, c)) {
3268 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
3269 *al = SSL_AD_INTERNAL_ERROR;
3274 if (PACKET_remaining(cipher_suites) > 0) {
3275 *al = SSL_AD_INTERNAL_ERROR;
3276 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_INTERNAL_ERROR);
3284 if ((skp == NULL) || (*skp == NULL))
3285 sk_SSL_CIPHER_free(sk);