2 * Copyright 2015-2017 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
11 #include <openssl/rand.h>
12 #include "../ssl_locl.h"
13 #include "statem_locl.h"
16 * This file implements the SSL/TLS/DTLS state machines.
18 * There are two primary state machines:
20 * 1) Message flow state machine
21 * 2) Handshake state machine
23 * The Message flow state machine controls the reading and sending of messages
24 * including handling of non-blocking IO events, flushing of the underlying
25 * write BIO, handling unexpected messages, etc. It is itself broken into two
26 * separate sub-state machines which control reading and writing respectively.
28 * The Handshake state machine keeps track of the current SSL/TLS handshake
29 * state. Transitions of the handshake state are the result of events that
30 * occur within the Message flow state machine.
32 * Overall it looks like this:
34 * --------------------------------------------- -------------------
36 * | Message flow state machine | | |
38 * | -------------------- -------------------- | Transition | Handshake state |
39 * | | MSG_FLOW_READING | | MSG_FLOW_WRITING | | Event | machine |
40 * | | sub-state | | sub-state | |----------->| |
41 * | | machine for | | machine for | | | |
42 * | | reading messages | | writing messages | | | |
43 * | -------------------- -------------------- | | |
45 * --------------------------------------------- -------------------
49 /* Sub state machine return values */
51 /* Something bad happened or NBIO */
53 /* Sub state finished go to the next sub state */
55 /* Sub state finished and handshake was completed */
56 SUB_STATE_END_HANDSHAKE
59 static int state_machine(SSL
*s
, int server
);
60 static void init_read_state_machine(SSL
*s
);
61 static SUB_STATE_RETURN
read_state_machine(SSL
*s
);
62 static void init_write_state_machine(SSL
*s
);
63 static SUB_STATE_RETURN
write_state_machine(SSL
*s
);
65 OSSL_HANDSHAKE_STATE
SSL_get_state(const SSL
*ssl
)
67 return ssl
->statem
.hand_state
;
70 int SSL_in_init(SSL
*s
)
72 return s
->statem
.in_init
;
75 int SSL_is_init_finished(SSL
*s
)
77 return !(s
->statem
.in_init
) && (s
->statem
.hand_state
== TLS_ST_OK
);
80 int SSL_in_before(SSL
*s
)
83 * Historically being "in before" meant before anything had happened. In the
84 * current code though we remain in the "before" state for a while after we
85 * have started the handshake process (e.g. as a server waiting for the
86 * first message to arrive). There "in before" is taken to mean "in before"
87 * and not started any handshake process yet.
89 return (s
->statem
.hand_state
== TLS_ST_BEFORE
)
90 && (s
->statem
.state
== MSG_FLOW_UNINITED
);
94 * Clear the state machine state and reset back to MSG_FLOW_UNINITED
96 void ossl_statem_clear(SSL
*s
)
98 s
->statem
.state
= MSG_FLOW_UNINITED
;
99 s
->statem
.hand_state
= TLS_ST_BEFORE
;
100 s
->statem
.in_init
= 1;
101 s
->statem
.no_cert_verify
= 0;
105 * Set the state machine up ready for a renegotiation handshake
107 void ossl_statem_set_renegotiate(SSL
*s
)
109 s
->statem
.in_init
= 1;
110 s
->statem
.request_state
= TLS_ST_SW_HELLO_REQ
;
114 * Put the state machine into an error state. This is a permanent error for
115 * the current connection.
117 void ossl_statem_set_error(SSL
*s
)
119 s
->statem
.state
= MSG_FLOW_ERROR
;
123 * Discover whether the current connection is in the error state.
125 * Valid return values are:
129 int ossl_statem_in_error(const SSL
*s
)
131 if (s
->statem
.state
== MSG_FLOW_ERROR
)
137 void ossl_statem_set_in_init(SSL
*s
, int init
)
139 s
->statem
.in_init
= init
;
142 int ossl_statem_get_in_handshake(SSL
*s
)
144 return s
->statem
.in_handshake
;
147 void ossl_statem_set_in_handshake(SSL
*s
, int inhand
)
150 s
->statem
.in_handshake
++;
152 s
->statem
.in_handshake
--;
155 /* Are we in a sensible state to skip over unreadable early data? */
156 int ossl_statem_skip_early_data(SSL
*s
)
158 if (s
->ext
.early_data
!= SSL_EARLY_DATA_REJECTED
)
161 if (!s
->server
|| s
->statem
.hand_state
!= TLS_ST_EARLY_DATA
)
168 * Called when we are in SSL_read*(), SSL_write*(), or SSL_accept()
169 * /SSL_connect()/SSL_do_handshake(). Used to test whether we are in an early
170 * data state and whether we should attempt to move the handshake on if so.
171 * |sending| is 1 if we are attempting to send data (SSL_write*()), 0 if we are
172 * attempting to read data (SSL_read*()), or -1 if we are in SSL_do_handshake()
175 void ossl_statem_check_finish_init(SSL
*s
, int sending
)
178 if (s
->statem
.hand_state
== TLS_ST_PENDING_EARLY_DATA_END
179 || s
->statem
.hand_state
== TLS_ST_EARLY_DATA
) {
180 ossl_statem_set_in_init(s
, 1);
181 if (s
->early_data_state
== SSL_EARLY_DATA_WRITE_RETRY
) {
183 * SSL_connect() or SSL_do_handshake() has been called directly.
184 * We don't allow any more writing of early data.
186 s
->early_data_state
= SSL_EARLY_DATA_FINISHED_WRITING
;
189 } else if (!s
->server
) {
190 if ((sending
&& (s
->statem
.hand_state
== TLS_ST_PENDING_EARLY_DATA_END
191 || s
->statem
.hand_state
== TLS_ST_EARLY_DATA
)
192 && s
->early_data_state
!= SSL_EARLY_DATA_WRITING
)
193 || (!sending
&& s
->statem
.hand_state
== TLS_ST_EARLY_DATA
)) {
194 ossl_statem_set_in_init(s
, 1);
196 * SSL_write() has been called directly. We don't allow any more
197 * writing of early data.
199 if (sending
&& s
->early_data_state
== SSL_EARLY_DATA_WRITE_RETRY
)
200 s
->early_data_state
= SSL_EARLY_DATA_FINISHED_WRITING
;
203 if (s
->early_data_state
== SSL_EARLY_DATA_FINISHED_READING
204 && s
->statem
.hand_state
== TLS_ST_EARLY_DATA
)
205 ossl_statem_set_in_init(s
, 1);
209 void ossl_statem_set_hello_verify_done(SSL
*s
)
211 s
->statem
.state
= MSG_FLOW_UNINITED
;
212 s
->statem
.in_init
= 1;
214 * This will get reset (briefly) back to TLS_ST_BEFORE when we enter
215 * state_machine() because |state| is MSG_FLOW_UNINITED, but until then any
216 * calls to SSL_in_before() will return false. Also calls to
217 * SSL_state_string() and SSL_state_string_long() will return something
220 s
->statem
.hand_state
= TLS_ST_SR_CLNT_HELLO
;
223 int ossl_statem_connect(SSL
*s
)
225 return state_machine(s
, 0);
228 int ossl_statem_accept(SSL
*s
)
230 return state_machine(s
, 1);
233 typedef void (*info_cb
) (const SSL
*, int, int);
235 static info_cb
get_callback(SSL
*s
)
237 if (s
->info_callback
!= NULL
)
238 return s
->info_callback
;
239 else if (s
->ctx
->info_callback
!= NULL
)
240 return s
->ctx
->info_callback
;
246 * The main message flow state machine. We start in the MSG_FLOW_UNINITED or
247 * MSG_FLOW_FINISHED state and finish in MSG_FLOW_FINISHED. Valid states and
248 * transitions are as follows:
250 * MSG_FLOW_UNINITED MSG_FLOW_FINISHED
252 * +-----------------------+
254 * MSG_FLOW_WRITING <---> MSG_FLOW_READING
262 * We may exit at any point due to an error or NBIO event. If an NBIO event
263 * occurs then we restart at the point we left off when we are recalled.
264 * MSG_FLOW_WRITING and MSG_FLOW_READING have sub-state machines associated with them.
266 * In addition to the above there is also the MSG_FLOW_ERROR state. We can move
267 * into that state at any point in the event that an irrecoverable error occurs.
269 * Valid return values are:
273 static int state_machine(SSL
*s
, int server
)
276 void (*cb
) (const SSL
*ssl
, int type
, int val
) = NULL
;
277 OSSL_STATEM
*st
= &s
->statem
;
281 if (st
->state
== MSG_FLOW_ERROR
) {
282 /* Shouldn't have been called if we're already in the error state */
289 cb
= get_callback(s
);
292 if (!SSL_in_init(s
) || SSL_in_before(s
)) {
296 #ifndef OPENSSL_NO_SCTP
297 if (SSL_IS_DTLS(s
) && BIO_dgram_is_sctp(SSL_get_wbio(s
))) {
299 * Notify SCTP BIO socket to enter handshake mode and prevent stream
300 * identifier other than 0.
302 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE
,
303 st
->in_handshake
, NULL
);
307 /* Initialise state machine */
308 if (st
->state
== MSG_FLOW_UNINITED
309 || st
->state
== MSG_FLOW_FINISHED
) {
310 if (st
->state
== MSG_FLOW_UNINITED
) {
311 st
->hand_state
= TLS_ST_BEFORE
;
312 st
->request_state
= TLS_ST_BEFORE
;
317 cb(s
, SSL_CB_HANDSHAKE_START
, 1);
319 if (SSL_IS_DTLS(s
)) {
320 if ((s
->version
& 0xff00) != (DTLS1_VERSION
& 0xff00) &&
321 (server
|| (s
->version
& 0xff00) != (DTLS1_BAD_VER
& 0xff00))) {
322 SSLerr(SSL_F_STATE_MACHINE
, ERR_R_INTERNAL_ERROR
);
326 if ((s
->version
>> 8) != SSL3_VERSION_MAJOR
) {
327 SSLerr(SSL_F_STATE_MACHINE
, ERR_R_INTERNAL_ERROR
);
332 if (!ssl_security(s
, SSL_SECOP_VERSION
, 0, s
->version
, NULL
)) {
333 SSLerr(SSL_F_STATE_MACHINE
, SSL_R_VERSION_TOO_LOW
);
337 if (s
->init_buf
== NULL
) {
338 if ((buf
= BUF_MEM_new()) == NULL
) {
341 if (!BUF_MEM_grow(buf
, SSL3_RT_MAX_PLAIN_LENGTH
)) {
348 if (!ssl3_setup_buffers(s
)) {
354 * Should have been reset by tls_process_finished, too.
356 s
->s3
->change_cipher_spec
= 0;
359 * Ok, we now need to push on a buffering BIO ...but not with
362 #ifndef OPENSSL_NO_SCTP
363 if (!SSL_IS_DTLS(s
) || !BIO_dgram_is_sctp(SSL_get_wbio(s
)))
365 if (!ssl_init_wbio_buffer(s
)) {
369 if ((SSL_in_before(s
))
371 if (!tls_setup_handshake(s
)) {
372 ossl_statem_set_error(s
);
376 if (SSL_IS_FIRST_HANDSHAKE(s
))
377 st
->read_state_first_init
= 1;
380 st
->state
= MSG_FLOW_WRITING
;
381 init_write_state_machine(s
);
384 while (st
->state
!= MSG_FLOW_FINISHED
) {
385 if (st
->state
== MSG_FLOW_READING
) {
386 ssret
= read_state_machine(s
);
387 if (ssret
== SUB_STATE_FINISHED
) {
388 st
->state
= MSG_FLOW_WRITING
;
389 init_write_state_machine(s
);
394 } else if (st
->state
== MSG_FLOW_WRITING
) {
395 ssret
= write_state_machine(s
);
396 if (ssret
== SUB_STATE_FINISHED
) {
397 st
->state
= MSG_FLOW_READING
;
398 init_read_state_machine(s
);
399 } else if (ssret
== SUB_STATE_END_HANDSHAKE
) {
400 st
->state
= MSG_FLOW_FINISHED
;
407 ossl_statem_set_error(s
);
417 #ifndef OPENSSL_NO_SCTP
418 if (SSL_IS_DTLS(s
) && BIO_dgram_is_sctp(SSL_get_wbio(s
))) {
420 * Notify SCTP BIO socket to leave handshake mode and allow stream
421 * identifier other than 0.
423 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE
,
424 st
->in_handshake
, NULL
);
431 cb(s
, SSL_CB_ACCEPT_EXIT
, ret
);
433 cb(s
, SSL_CB_CONNECT_EXIT
, ret
);
439 * Initialise the MSG_FLOW_READING sub-state machine
441 static void init_read_state_machine(SSL
*s
)
443 OSSL_STATEM
*st
= &s
->statem
;
445 st
->read_state
= READ_STATE_HEADER
;
448 static int grow_init_buf(SSL
*s
, size_t size
) {
450 size_t msg_offset
= (char *)s
->init_msg
- s
->init_buf
->data
;
452 if (!BUF_MEM_grow_clean(s
->init_buf
, (int)size
))
455 if (size
< msg_offset
)
458 s
->init_msg
= s
->init_buf
->data
+ msg_offset
;
464 * This function implements the sub-state machine when the message flow is in
465 * MSG_FLOW_READING. The valid sub-states and transitions are:
467 * READ_STATE_HEADER <--+<-------------+
470 * READ_STATE_BODY -----+-->READ_STATE_POST_PROCESS
472 * +----------------------------+
474 * [SUB_STATE_FINISHED]
476 * READ_STATE_HEADER has the responsibility for reading in the message header
477 * and transitioning the state of the handshake state machine.
479 * READ_STATE_BODY reads in the rest of the message and then subsequently
482 * READ_STATE_POST_PROCESS is an optional step that may occur if some post
483 * processing activity performed on the message may block.
485 * Any of the above states could result in an NBIO event occurring in which case
486 * control returns to the calling application. When this function is recalled we
487 * will resume in the same state where we left off.
489 static SUB_STATE_RETURN
read_state_machine(SSL
*s
)
491 OSSL_STATEM
*st
= &s
->statem
;
494 int (*transition
) (SSL
*s
, int mt
);
496 MSG_PROCESS_RETURN(*process_message
) (SSL
*s
, PACKET
*pkt
);
497 WORK_STATE(*post_process_message
) (SSL
*s
, WORK_STATE wst
);
498 size_t (*max_message_size
) (SSL
*s
);
499 void (*cb
) (const SSL
*ssl
, int type
, int val
) = NULL
;
501 cb
= get_callback(s
);
504 transition
= ossl_statem_server_read_transition
;
505 process_message
= ossl_statem_server_process_message
;
506 max_message_size
= ossl_statem_server_max_message_size
;
507 post_process_message
= ossl_statem_server_post_process_message
;
509 transition
= ossl_statem_client_read_transition
;
510 process_message
= ossl_statem_client_process_message
;
511 max_message_size
= ossl_statem_client_max_message_size
;
512 post_process_message
= ossl_statem_client_post_process_message
;
515 if (st
->read_state_first_init
) {
517 st
->read_state_first_init
= 0;
521 switch (st
->read_state
) {
522 case READ_STATE_HEADER
:
523 /* Get the state the peer wants to move to */
524 if (SSL_IS_DTLS(s
)) {
526 * In DTLS we get the whole message in one go - header and body
528 ret
= dtls_get_message(s
, &mt
, &len
);
530 ret
= tls_get_message_header(s
, &mt
);
534 /* Could be non-blocking IO */
535 return SUB_STATE_ERROR
;
539 /* Notify callback of an impending state change */
541 cb(s
, SSL_CB_ACCEPT_LOOP
, 1);
543 cb(s
, SSL_CB_CONNECT_LOOP
, 1);
546 * Validate that we are allowed to move to the new state and move
547 * to that state if so
549 if (!transition(s
, mt
)) {
550 ossl_statem_set_error(s
);
551 return SUB_STATE_ERROR
;
554 if (s
->s3
->tmp
.message_size
> max_message_size(s
)) {
555 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL_AD_ILLEGAL_PARAMETER
);
556 SSLerr(SSL_F_READ_STATE_MACHINE
, SSL_R_EXCESSIVE_MESSAGE_SIZE
);
557 return SUB_STATE_ERROR
;
560 /* dtls_get_message already did this */
562 && s
->s3
->tmp
.message_size
> 0
563 && !grow_init_buf(s
, s
->s3
->tmp
.message_size
564 + SSL3_HM_HEADER_LENGTH
)) {
565 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL_AD_INTERNAL_ERROR
);
566 SSLerr(SSL_F_READ_STATE_MACHINE
, ERR_R_BUF_LIB
);
567 return SUB_STATE_ERROR
;
570 st
->read_state
= READ_STATE_BODY
;
573 case READ_STATE_BODY
:
574 if (!SSL_IS_DTLS(s
)) {
575 /* We already got this above for DTLS */
576 ret
= tls_get_message_body(s
, &len
);
578 /* Could be non-blocking IO */
579 return SUB_STATE_ERROR
;
584 if (!PACKET_buf_init(&pkt
, s
->init_msg
, len
)) {
585 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL_AD_INTERNAL_ERROR
);
586 SSLerr(SSL_F_READ_STATE_MACHINE
, ERR_R_INTERNAL_ERROR
);
587 return SUB_STATE_ERROR
;
589 ret
= process_message(s
, &pkt
);
591 /* Discard the packet data */
595 case MSG_PROCESS_ERROR
:
596 return SUB_STATE_ERROR
;
598 case MSG_PROCESS_FINISHED_READING
:
599 if (SSL_IS_DTLS(s
)) {
602 return SUB_STATE_FINISHED
;
604 case MSG_PROCESS_CONTINUE_PROCESSING
:
605 st
->read_state
= READ_STATE_POST_PROCESS
;
606 st
->read_state_work
= WORK_MORE_A
;
610 st
->read_state
= READ_STATE_HEADER
;
615 case READ_STATE_POST_PROCESS
:
616 st
->read_state_work
= post_process_message(s
, st
->read_state_work
);
617 switch (st
->read_state_work
) {
622 return SUB_STATE_ERROR
;
624 case WORK_FINISHED_CONTINUE
:
625 st
->read_state
= READ_STATE_HEADER
;
628 case WORK_FINISHED_STOP
:
629 if (SSL_IS_DTLS(s
)) {
632 return SUB_STATE_FINISHED
;
637 /* Shouldn't happen */
638 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL_AD_INTERNAL_ERROR
);
639 SSLerr(SSL_F_READ_STATE_MACHINE
, ERR_R_INTERNAL_ERROR
);
640 ossl_statem_set_error(s
);
641 return SUB_STATE_ERROR
;
647 * Send a previously constructed message to the peer.
649 static int statem_do_write(SSL
*s
)
651 OSSL_STATEM
*st
= &s
->statem
;
653 if (st
->hand_state
== TLS_ST_CW_CHANGE
654 || st
->hand_state
== TLS_ST_SW_CHANGE
) {
656 return dtls1_do_write(s
, SSL3_RT_CHANGE_CIPHER_SPEC
);
658 return ssl3_do_write(s
, SSL3_RT_CHANGE_CIPHER_SPEC
);
660 return ssl_do_write(s
);
665 * Initialise the MSG_FLOW_WRITING sub-state machine
667 static void init_write_state_machine(SSL
*s
)
669 OSSL_STATEM
*st
= &s
->statem
;
671 st
->write_state
= WRITE_STATE_TRANSITION
;
675 * This function implements the sub-state machine when the message flow is in
676 * MSG_FLOW_WRITING. The valid sub-states and transitions are:
678 * +-> WRITE_STATE_TRANSITION ------> [SUB_STATE_FINISHED]
681 * | WRITE_STATE_PRE_WORK -----> [SUB_STATE_END_HANDSHAKE]
687 * | WRITE_STATE_POST_WORK
691 * WRITE_STATE_TRANSITION transitions the state of the handshake state machine
693 * WRITE_STATE_PRE_WORK performs any work necessary to prepare the later
694 * sending of the message. This could result in an NBIO event occurring in
695 * which case control returns to the calling application. When this function
696 * is recalled we will resume in the same state where we left off.
698 * WRITE_STATE_SEND sends the message and performs any work to be done after
701 * WRITE_STATE_POST_WORK performs any work necessary after the sending of the
702 * message has been completed. As for WRITE_STATE_PRE_WORK this could also
703 * result in an NBIO event.
705 static SUB_STATE_RETURN
write_state_machine(SSL
*s
)
707 OSSL_STATEM
*st
= &s
->statem
;
709 WRITE_TRAN(*transition
) (SSL
*s
);
710 WORK_STATE(*pre_work
) (SSL
*s
, WORK_STATE wst
);
711 WORK_STATE(*post_work
) (SSL
*s
, WORK_STATE wst
);
712 int (*get_construct_message_f
) (SSL
*s
, WPACKET
*pkt
,
713 int (**confunc
) (SSL
*s
, WPACKET
*pkt
),
715 void (*cb
) (const SSL
*ssl
, int type
, int val
) = NULL
;
716 int (*confunc
) (SSL
*s
, WPACKET
*pkt
);
720 cb
= get_callback(s
);
723 transition
= ossl_statem_server_write_transition
;
724 pre_work
= ossl_statem_server_pre_work
;
725 post_work
= ossl_statem_server_post_work
;
726 get_construct_message_f
= ossl_statem_server_construct_message
;
728 transition
= ossl_statem_client_write_transition
;
729 pre_work
= ossl_statem_client_pre_work
;
730 post_work
= ossl_statem_client_post_work
;
731 get_construct_message_f
= ossl_statem_client_construct_message
;
735 switch (st
->write_state
) {
736 case WRITE_STATE_TRANSITION
:
738 /* Notify callback of an impending state change */
740 cb(s
, SSL_CB_ACCEPT_LOOP
, 1);
742 cb(s
, SSL_CB_CONNECT_LOOP
, 1);
744 switch (transition(s
)) {
745 case WRITE_TRAN_CONTINUE
:
746 st
->write_state
= WRITE_STATE_PRE_WORK
;
747 st
->write_state_work
= WORK_MORE_A
;
750 case WRITE_TRAN_FINISHED
:
751 return SUB_STATE_FINISHED
;
754 case WRITE_TRAN_ERROR
:
755 return SUB_STATE_ERROR
;
759 case WRITE_STATE_PRE_WORK
:
760 switch (st
->write_state_work
= pre_work(s
, st
->write_state_work
)) {
765 return SUB_STATE_ERROR
;
767 case WORK_FINISHED_CONTINUE
:
768 st
->write_state
= WRITE_STATE_SEND
;
771 case WORK_FINISHED_STOP
:
772 return SUB_STATE_END_HANDSHAKE
;
774 if (!get_construct_message_f(s
, &pkt
, &confunc
, &mt
)) {
775 ossl_statem_set_error(s
);
776 return SUB_STATE_ERROR
;
778 if (mt
== SSL3_MT_DUMMY
) {
779 /* Skip construction and sending. This isn't a "real" state */
780 st
->write_state
= WRITE_STATE_POST_WORK
;
781 st
->write_state_work
= WORK_MORE_A
;
784 if (!WPACKET_init(&pkt
, s
->init_buf
)
785 || !ssl_set_handshake_header(s
, &pkt
, mt
)
786 || (confunc
!= NULL
&& !confunc(s
, &pkt
))
787 || !ssl_close_construct_packet(s
, &pkt
, mt
)
788 || !WPACKET_finish(&pkt
)) {
789 WPACKET_cleanup(&pkt
);
790 ossl_statem_set_error(s
);
791 return SUB_STATE_ERROR
;
796 case WRITE_STATE_SEND
:
797 if (SSL_IS_DTLS(s
) && st
->use_timer
) {
798 dtls1_start_timer(s
);
800 ret
= statem_do_write(s
);
802 return SUB_STATE_ERROR
;
804 st
->write_state
= WRITE_STATE_POST_WORK
;
805 st
->write_state_work
= WORK_MORE_A
;
808 case WRITE_STATE_POST_WORK
:
809 switch (st
->write_state_work
= post_work(s
, st
->write_state_work
)) {
814 return SUB_STATE_ERROR
;
816 case WORK_FINISHED_CONTINUE
:
817 st
->write_state
= WRITE_STATE_TRANSITION
;
820 case WORK_FINISHED_STOP
:
821 return SUB_STATE_END_HANDSHAKE
;
826 return SUB_STATE_ERROR
;
832 * Flush the write BIO
834 int statem_flush(SSL
*s
)
836 s
->rwstate
= SSL_WRITING
;
837 if (BIO_flush(s
->wbio
) <= 0) {
840 s
->rwstate
= SSL_NOTHING
;
846 * Called by the record layer to determine whether application data is
847 * allowed to be received in the current handshake state or not.
850 * 1: Yes (application data allowed)
851 * 0: No (application data not allowed)
853 int ossl_statem_app_data_allowed(SSL
*s
)
855 OSSL_STATEM
*st
= &s
->statem
;
857 if (st
->state
== MSG_FLOW_UNINITED
)
860 if (!s
->s3
->in_read_app_data
|| (s
->s3
->total_renegotiations
== 0))
865 * If we're a server and we haven't got as far as writing our
866 * ServerHello yet then we allow app data
868 if (st
->hand_state
== TLS_ST_BEFORE
869 || st
->hand_state
== TLS_ST_SR_CLNT_HELLO
)
873 * If we're a client and we haven't read the ServerHello yet then we
876 if (st
->hand_state
== TLS_ST_CW_CLNT_HELLO
)