1 /* ssl/statem/statem.c */
3 * Written by Matt Caswell for the OpenSSL project.
5 /* ====================================================================
6 * Copyright (c) 1998-2015 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * openssl-core@openssl.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
59 #include <openssl/rand.h>
60 #include "../ssl_locl.h"
61 #include "statem_locl.h"
64 * This file implements the SSL/TLS/DTLS state machines.
66 * There are two primary state machines:
68 * 1) Message flow state machine
69 * 2) Handshake state machine
71 * The Message flow state machine controls the reading and sending of messages
72 * including handling of non-blocking IO events, flushing of the underlying
73 * write BIO, handling unexpected messages, etc. It is itself broken into two
74 * separate sub-state machines which control reading and writing respectively.
76 * The Handshake state machine keeps track of the current SSL/TLS handshake
77 * state. Transitions of the handshake state are the result of events that
78 * occur within the Message flow state machine.
80 * Overall it looks like this:
82 * --------------------------------------------- -------------------
84 * | Message flow state machine | | |
86 * | -------------------- -------------------- | Transition | Handshake state |
87 * | | MSG_FLOW_READING | | MSG_FLOW_WRITING | | Event | machine |
88 * | | sub-state | | sub-state | |----------->| |
89 * | | machine for | | machine for | | | |
90 * | | reading messages | | writing messages | | | |
91 * | -------------------- -------------------- | | |
93 * --------------------------------------------- -------------------
97 /* Sub state machine return values */
98 enum SUB_STATE_RETURN
{
99 /* Something bad happened or NBIO */
101 /* Sub state finished go to the next sub state */
103 /* Sub state finished and handshake was completed */
104 SUB_STATE_END_HANDSHAKE
107 static int state_machine(SSL
*s
, int server
);
108 static void init_read_state_machine(SSL
*s
);
109 static enum SUB_STATE_RETURN
read_state_machine(SSL
*s
);
110 static void init_write_state_machine(SSL
*s
);
111 static enum SUB_STATE_RETURN
write_state_machine(SSL
*s
);
113 OSSL_HANDSHAKE_STATE
SSL_get_state(const SSL
*ssl
)
115 return ssl
->statem
.hand_state
;
118 int SSL_in_init(SSL
*s
)
120 return s
->statem
.in_init
;
123 int SSL_is_init_finished(SSL
*s
)
125 return !(s
->statem
.in_init
) && (s
->statem
.hand_state
== TLS_ST_OK
);
128 int SSL_in_before(SSL
*s
)
131 * Historically being "in before" meant before anything had happened. In the
132 * current code though we remain in the "before" state for a while after we
133 * have started the handshake process (e.g. as a server waiting for the
134 * first message to arrive). There "in before" is taken to mean "in before"
135 * and not started any handshake process yet.
137 return (s
->statem
.hand_state
== TLS_ST_BEFORE
)
138 && (s
->statem
.state
== MSG_FLOW_UNINITED
);
142 * Clear the state machine state and reset back to MSG_FLOW_UNINITED
144 void ossl_statem_clear(SSL
*s
)
146 s
->statem
.state
= MSG_FLOW_UNINITED
;
147 s
->statem
.hand_state
= TLS_ST_BEFORE
;
148 s
->statem
.in_init
= 1;
149 s
->statem
.no_cert_verify
= 0;
153 * Set the state machine up ready for a renegotiation handshake
155 void ossl_statem_set_renegotiate(SSL
*s
)
157 s
->statem
.state
= MSG_FLOW_RENEGOTIATE
;
158 s
->statem
.in_init
= 1;
162 * Put the state machine into an error state. This is a permanent error for
163 * the current connection.
165 void ossl_statem_set_error(SSL
*s
)
167 s
->statem
.state
= MSG_FLOW_ERROR
;
171 * Discover whether the current connection is in the error state.
173 * Valid return values are:
177 int ossl_statem_in_error(const SSL
*s
)
179 if (s
->statem
.state
== MSG_FLOW_ERROR
)
185 void ossl_statem_set_in_init(SSL
*s
, int init
)
187 s
->statem
.in_init
= init
;
190 int ossl_statem_connect(SSL
*s
) {
191 return state_machine(s
, 0);
194 int ossl_statem_accept(SSL
*s
)
196 return state_machine(s
, 1);
200 * The main message flow state machine. We start in the MSG_FLOW_UNINITED or
201 * MSG_FLOW_RENEGOTIATE state and finish in MSG_FLOW_FINISHED. Valid states and
202 * transitions are as follows:
204 * MSG_FLOW_UNINITED MSG_FLOW_RENEGOTIATE
206 * +-----------------------+
208 * MSG_FLOW_WRITING <---> MSG_FLOW_READING
216 * We may exit at any point due to an error or NBIO event. If an NBIO event
217 * occurs then we restart at the point we left off when we are recalled.
218 * MSG_FLOW_WRITING and MSG_FLOW_READING have sub-state machines associated with them.
220 * In addition to the above there is also the MSG_FLOW_ERROR state. We can move
221 * into that state at any point in the event that an irrecoverable error occurs.
223 * Valid return values are:
227 static int state_machine(SSL
*s
, int server
) {
229 unsigned long Time
= (unsigned long)time(NULL
);
230 void (*cb
) (const SSL
*ssl
, int type
, int val
) = NULL
;
231 OSSL_STATEM
*st
= &s
->statem
;
235 if (st
->state
== MSG_FLOW_ERROR
) {
236 /* Shouldn't have been called if we're already in the error state */
240 RAND_add(&Time
, sizeof(Time
), 0);
244 if (s
->info_callback
!= NULL
)
245 cb
= s
->info_callback
;
246 else if (s
->ctx
->info_callback
!= NULL
)
247 cb
= s
->ctx
->info_callback
;
250 if (!SSL_in_init(s
) || SSL_in_before(s
)) {
255 #ifndef OPENSSL_NO_SCTP
256 if (SSL_IS_DTLS(s
)) {
258 * Notify SCTP BIO socket to enter handshake mode and prevent stream
259 * identifier other than 0. Will be ignored if no SCTP is used.
261 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE
,
262 s
->in_handshake
, NULL
);
266 #ifndef OPENSSL_NO_HEARTBEATS
268 * If we're awaiting a HeartbeatResponse, pretend we already got and
269 * don't await it anymore, because Heartbeats don't make sense during
272 if (s
->tlsext_hb_pending
) {
275 s
->tlsext_hb_pending
= 0;
280 /* Initialise state machine */
282 if (st
->state
== MSG_FLOW_RENEGOTIATE
) {
285 s
->ctx
->stats
.sess_connect_renegotiate
++;
288 if (st
->state
== MSG_FLOW_UNINITED
|| st
->state
== MSG_FLOW_RENEGOTIATE
) {
289 if (st
->state
== MSG_FLOW_UNINITED
) {
290 st
->hand_state
= TLS_ST_BEFORE
;
295 cb(s
, SSL_CB_HANDSHAKE_START
, 1);
297 if (SSL_IS_DTLS(s
)) {
298 if ((s
->version
& 0xff00) != (DTLS1_VERSION
& 0xff00) &&
300 || (s
->version
& 0xff00) != (DTLS1_BAD_VER
& 0xff00))) {
301 SSLerr(SSL_F_STATE_MACHINE
, ERR_R_INTERNAL_ERROR
);
305 if ((s
->version
>> 8) != SSL3_VERSION_MAJOR
306 && s
->version
!= TLS_ANY_VERSION
) {
307 SSLerr(SSL_F_STATE_MACHINE
, ERR_R_INTERNAL_ERROR
);
312 if (!SSL_IS_DTLS(s
)) {
313 if (s
->version
!= TLS_ANY_VERSION
&&
314 !ssl_security(s
, SSL_SECOP_VERSION
, 0, s
->version
, NULL
)) {
315 SSLerr(SSL_F_STATE_MACHINE
, SSL_R_VERSION_TOO_LOW
);
320 if (s
->init_buf
== NULL
) {
321 if ((buf
= BUF_MEM_new()) == NULL
) {
324 if (!BUF_MEM_grow(buf
, SSL3_RT_MAX_PLAIN_LENGTH
)) {
331 if (!ssl3_setup_buffers(s
)) {
337 * Should have been reset by tls_process_finished, too.
339 s
->s3
->change_cipher_spec
= 0;
341 if (!server
|| st
->state
!= MSG_FLOW_RENEGOTIATE
) {
343 * Ok, we now need to push on a buffering BIO ...but not with
346 #ifndef OPENSSL_NO_SCTP
347 if (!SSL_IS_DTLS(s
) || !BIO_dgram_is_sctp(SSL_get_wbio(s
)))
349 if (!ssl_init_wbio_buffer(s
, server
? 1 : 0)) {
353 ssl3_init_finished_mac(s
);
357 if (st
->state
!= MSG_FLOW_RENEGOTIATE
) {
358 s
->ctx
->stats
.sess_accept
++;
359 } else if (!s
->s3
->send_connection_binding
&&
361 SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION
)) {
363 * Server attempting to renegotiate with client that doesn't
364 * support secure renegotiation.
366 SSLerr(SSL_F_STATE_MACHINE
,
367 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED
);
368 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL_AD_HANDSHAKE_FAILURE
);
369 ossl_statem_set_error(s
);
373 * st->state == MSG_FLOW_RENEGOTIATE, we will just send a
376 s
->ctx
->stats
.sess_accept_renegotiate
++;
379 s
->ctx
->stats
.sess_connect
++;
381 /* mark client_random uninitialized */
382 memset(s
->s3
->client_random
, 0, sizeof(s
->s3
->client_random
));
385 s
->s3
->tmp
.cert_request
= 0;
387 if (SSL_IS_DTLS(s
)) {
392 st
->state
= MSG_FLOW_WRITING
;
393 init_write_state_machine(s
);
394 st
->read_state_first_init
= 1;
397 while(st
->state
!= MSG_FLOW_FINISHED
) {
398 if(st
->state
== MSG_FLOW_READING
) {
399 ssret
= read_state_machine(s
);
400 if (ssret
== SUB_STATE_FINISHED
) {
401 st
->state
= MSG_FLOW_WRITING
;
402 init_write_state_machine(s
);
407 } else if (st
->state
== MSG_FLOW_WRITING
) {
408 ssret
= write_state_machine(s
);
409 if (ssret
== SUB_STATE_FINISHED
) {
410 st
->state
= MSG_FLOW_READING
;
411 init_read_state_machine(s
);
412 } else if (ssret
== SUB_STATE_END_HANDSHAKE
) {
413 st
->state
= MSG_FLOW_FINISHED
;
420 ossl_statem_set_error(s
);
425 st
->state
= MSG_FLOW_UNINITED
;
431 #ifndef OPENSSL_NO_SCTP
432 if (SSL_IS_DTLS(s
)) {
434 * Notify SCTP BIO socket to leave handshake mode and allow stream
435 * identifier other than 0. Will be ignored if no SCTP is used.
437 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE
,
438 s
->in_handshake
, NULL
);
445 cb(s
, SSL_CB_ACCEPT_EXIT
, ret
);
447 cb(s
, SSL_CB_CONNECT_EXIT
, ret
);
453 * Initialise the MSG_FLOW_READING sub-state machine
455 static void init_read_state_machine(SSL
*s
)
457 OSSL_STATEM
*st
= &s
->statem
;
459 st
->read_state
= READ_STATE_HEADER
;
463 * This function implements the sub-state machine when the message flow is in
464 * MSG_FLOW_READING. The valid sub-states and transitions are:
466 * READ_STATE_HEADER <--+<-------------+
469 * READ_STATE_BODY -----+-->READ_STATE_POST_PROCESS
471 * +----------------------------+
473 * [SUB_STATE_FINISHED]
475 * READ_STATE_HEADER has the responsibility for reading in the message header
476 * and transitioning the state of the handshake state machine.
478 * READ_STATE_BODY reads in the rest of the message and then subsequently
481 * READ_STATE_POST_PROCESS is an optional step that may occur if some post
482 * processing activity performed on the message may block.
484 * Any of the above states could result in an NBIO event occuring in which case
485 * control returns to the calling application. When this function is recalled we
486 * will resume in the same state where we left off.
488 static enum SUB_STATE_RETURN
read_state_machine(SSL
*s
) {
489 OSSL_STATEM
*st
= &s
->statem
;
492 int (*transition
)(SSL
*s
, int mt
);
494 enum MSG_PROCESS_RETURN (*process_message
)(SSL
*s
, PACKET
*pkt
);
495 enum WORK_STATE (*post_process_message
)(SSL
*s
, enum WORK_STATE wst
);
496 unsigned long (*max_message_size
)(SSL
*s
);
497 void (*cb
) (const SSL
*ssl
, int type
, int val
) = NULL
;
499 if (s
->info_callback
!= NULL
)
500 cb
= s
->info_callback
;
501 else if (s
->ctx
->info_callback
!= NULL
)
502 cb
= s
->ctx
->info_callback
;
505 transition
= server_read_transition
;
506 process_message
= server_process_message
;
507 max_message_size
= server_max_message_size
;
508 post_process_message
= server_post_process_message
;
510 transition
= client_read_transition
;
511 process_message
= client_process_message
;
512 max_message_size
= client_max_message_size
;
513 post_process_message
= client_post_process_message
;
516 if (st
->read_state_first_init
) {
518 st
->read_state_first_init
= 0;
522 switch(st
->read_state
) {
523 case READ_STATE_HEADER
:
525 /* Get the state the peer wants to move to */
526 if (SSL_IS_DTLS(s
)) {
528 * In DTLS we get the whole message in one go - header and body
530 ret
= dtls_get_message(s
, &mt
, &len
);
532 ret
= tls_get_message_header(s
, &mt
);
536 /* Could be non-blocking IO */
537 return SUB_STATE_ERROR
;
541 /* Notify callback of an impending state change */
543 cb(s
, SSL_CB_ACCEPT_LOOP
, 1);
545 cb(s
, SSL_CB_CONNECT_LOOP
, 1);
548 * Validate that we are allowed to move to the new state and move
549 * to that state if so
551 if(!transition(s
, mt
)) {
552 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL3_AD_UNEXPECTED_MESSAGE
);
553 SSLerr(SSL_F_READ_STATE_MACHINE
, SSL_R_UNEXPECTED_MESSAGE
);
554 return SUB_STATE_ERROR
;
557 if (s
->s3
->tmp
.message_size
> max_message_size(s
)) {
558 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL_AD_ILLEGAL_PARAMETER
);
559 SSLerr(SSL_F_READ_STATE_MACHINE
, SSL_R_EXCESSIVE_MESSAGE_SIZE
);
560 return SUB_STATE_ERROR
;
563 st
->read_state
= READ_STATE_BODY
;
566 case READ_STATE_BODY
:
567 if (!SSL_IS_DTLS(s
)) {
568 /* We already got this above for DTLS */
569 ret
= tls_get_message_body(s
, &len
);
571 /* Could be non-blocking IO */
572 return SUB_STATE_ERROR
;
577 if (!PACKET_buf_init(&pkt
, s
->init_msg
, len
)) {
578 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL_AD_INTERNAL_ERROR
);
579 SSLerr(SSL_F_READ_STATE_MACHINE
, ERR_R_INTERNAL_ERROR
);
580 return SUB_STATE_ERROR
;
582 ret
= process_message(s
, &pkt
);
583 if (ret
== MSG_PROCESS_ERROR
) {
584 return SUB_STATE_ERROR
;
587 if (ret
== MSG_PROCESS_FINISHED_READING
) {
588 if (SSL_IS_DTLS(s
)) {
591 return SUB_STATE_FINISHED
;
594 if (ret
== MSG_PROCESS_CONTINUE_PROCESSING
) {
595 st
->read_state
= READ_STATE_POST_PROCESS
;
596 st
->read_state_work
= WORK_MORE_A
;
598 st
->read_state
= READ_STATE_HEADER
;
602 case READ_STATE_POST_PROCESS
:
603 st
->read_state_work
= post_process_message(s
, st
->read_state_work
);
604 switch(st
->read_state_work
) {
606 return SUB_STATE_ERROR
;
608 case WORK_FINISHED_CONTINUE
:
609 st
->read_state
= READ_STATE_HEADER
;
612 case WORK_FINISHED_STOP
:
613 if (SSL_IS_DTLS(s
)) {
616 return SUB_STATE_FINISHED
;
621 /* Shouldn't happen */
622 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL_AD_INTERNAL_ERROR
);
623 SSLerr(SSL_F_READ_STATE_MACHINE
, ERR_R_INTERNAL_ERROR
);
624 ossl_statem_set_error(s
);
625 return SUB_STATE_ERROR
;
631 * Send a previously constructed message to the peer.
633 static int statem_do_write(SSL
*s
)
635 OSSL_STATEM
*st
= &s
->statem
;
637 if (st
->hand_state
== TLS_ST_CW_CHANGE
638 || st
->hand_state
== TLS_ST_SW_CHANGE
) {
640 return dtls1_do_write(s
, SSL3_RT_CHANGE_CIPHER_SPEC
);
642 return ssl3_do_write(s
, SSL3_RT_CHANGE_CIPHER_SPEC
);
644 return ssl_do_write(s
);
649 * Initialise the MSG_FLOW_WRITING sub-state machine
651 static void init_write_state_machine(SSL
*s
)
653 OSSL_STATEM
*st
= &s
->statem
;
655 st
->write_state
= WRITE_STATE_TRANSITION
;
659 * This function implements the sub-state machine when the message flow is in
660 * MSG_FLOW_WRITING. The valid sub-states and transitions are:
662 * +-> WRITE_STATE_TRANSITION ------> [SUB_STATE_FINISHED]
665 * | WRITE_STATE_PRE_WORK -----> [SUB_STATE_END_HANDSHAKE]
671 * | WRITE_STATE_POST_WORK
675 * WRITE_STATE_TRANSITION transitions the state of the handshake state machine
677 * WRITE_STATE_PRE_WORK performs any work necessary to prepare the later
678 * sending of the message. This could result in an NBIO event occuring in
679 * which case control returns to the calling application. When this function
680 * is recalled we will resume in the same state where we left off.
682 * WRITE_STATE_SEND sends the message and performs any work to be done after
685 * WRITE_STATE_POST_WORK performs any work necessary after the sending of the
686 * message has been completed. As for WRITE_STATE_PRE_WORK this could also
687 * result in an NBIO event.
689 static enum SUB_STATE_RETURN
write_state_machine(SSL
*s
)
691 OSSL_STATEM
*st
= &s
->statem
;
693 enum WRITE_TRAN (*transition
)(SSL
*s
);
694 enum WORK_STATE (*pre_work
)(SSL
*s
, enum WORK_STATE wst
);
695 enum WORK_STATE (*post_work
)(SSL
*s
, enum WORK_STATE wst
);
696 int (*construct_message
)(SSL
*s
);
697 void (*cb
) (const SSL
*ssl
, int type
, int val
) = NULL
;
699 if (s
->info_callback
!= NULL
)
700 cb
= s
->info_callback
;
701 else if (s
->ctx
->info_callback
!= NULL
)
702 cb
= s
->ctx
->info_callback
;
705 transition
= server_write_transition
;
706 pre_work
= server_pre_work
;
707 post_work
= server_post_work
;
708 construct_message
= server_construct_message
;
710 transition
= client_write_transition
;
711 pre_work
= client_pre_work
;
712 post_work
= client_post_work
;
713 construct_message
= client_construct_message
;
717 switch(st
->write_state
) {
718 case WRITE_STATE_TRANSITION
:
720 /* Notify callback of an impending state change */
722 cb(s
, SSL_CB_ACCEPT_LOOP
, 1);
724 cb(s
, SSL_CB_CONNECT_LOOP
, 1);
726 switch(transition(s
)) {
727 case WRITE_TRAN_CONTINUE
:
728 st
->write_state
= WRITE_STATE_PRE_WORK
;
729 st
->write_state_work
= WORK_MORE_A
;
732 case WRITE_TRAN_FINISHED
:
733 return SUB_STATE_FINISHED
;
737 return SUB_STATE_ERROR
;
741 case WRITE_STATE_PRE_WORK
:
742 switch(st
->write_state_work
= pre_work(s
, st
->write_state_work
)) {
744 return SUB_STATE_ERROR
;
746 case WORK_FINISHED_CONTINUE
:
747 st
->write_state
= WRITE_STATE_SEND
;
750 case WORK_FINISHED_STOP
:
751 return SUB_STATE_END_HANDSHAKE
;
753 if(construct_message(s
) == 0)
754 return SUB_STATE_ERROR
;
758 case WRITE_STATE_SEND
:
759 if (SSL_IS_DTLS(s
) && st
->use_timer
) {
760 dtls1_start_timer(s
);
762 ret
= statem_do_write(s
);
764 return SUB_STATE_ERROR
;
766 st
->write_state
= WRITE_STATE_POST_WORK
;
767 st
->write_state_work
= WORK_MORE_A
;
770 case WRITE_STATE_POST_WORK
:
771 switch(st
->write_state_work
= post_work(s
, st
->write_state_work
)) {
773 return SUB_STATE_ERROR
;
775 case WORK_FINISHED_CONTINUE
:
776 st
->write_state
= WRITE_STATE_TRANSITION
;
779 case WORK_FINISHED_STOP
:
780 return SUB_STATE_END_HANDSHAKE
;
785 return SUB_STATE_ERROR
;
791 * Flush the write BIO
793 int statem_flush(SSL
*s
)
795 s
->rwstate
= SSL_WRITING
;
796 if (BIO_flush(s
->wbio
) <= 0) {
799 s
->rwstate
= SSL_NOTHING
;
805 * Called by the record layer to determine whether application data is
806 * allowed to be sent in the current handshake state or not.
809 * 1: Yes (application data allowed)
810 * 0: No (application data not allowed)
812 int ossl_statem_app_data_allowed(SSL
*s
)
814 OSSL_STATEM
*st
= &s
->statem
;
816 if (st
->state
== MSG_FLOW_UNINITED
|| st
->state
== MSG_FLOW_RENEGOTIATE
)
819 if (!s
->s3
->in_read_app_data
|| (s
->s3
->total_renegotiations
== 0))
824 * If we're a server and we haven't got as far as writing our
825 * ServerHello yet then we allow app data
827 if (st
->hand_state
== TLS_ST_BEFORE
828 || st
->hand_state
== TLS_ST_SR_CLNT_HELLO
)
832 * If we're a client and we haven't read the ServerHello yet then we
835 if (st
->hand_state
== TLS_ST_CW_CLNT_HELLO
)
842 #ifndef OPENSSL_NO_SCTP
844 * Set flag used by SCTP to determine whether we are in the read sock state
846 void ossl_statem_set_sctp_read_sock(SSL
*s
, int read_sock
)
848 s
->statem
.in_sctp_read_sock
= read_sock
;
852 * Called by the record layer to determine whether we are in the read sock
856 * 1: Yes (we are in the read sock state)
857 * 0: No (we are not in the read sock state)
859 int statem_in_sctp_read_sock(SSL
*s
)
861 return s
->statem
.in_sctp_read_sock
;