2 * Copyright 2015-2016 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 #include <openssl/rand.h>
11 #include "../ssl_locl.h"
12 #include "statem_locl.h"
15 * This file implements the SSL/TLS/DTLS state machines.
17 * There are two primary state machines:
19 * 1) Message flow state machine
20 * 2) Handshake state machine
22 * The Message flow state machine controls the reading and sending of messages
23 * including handling of non-blocking IO events, flushing of the underlying
24 * write BIO, handling unexpected messages, etc. It is itself broken into two
25 * separate sub-state machines which control reading and writing respectively.
27 * The Handshake state machine keeps track of the current SSL/TLS handshake
28 * state. Transitions of the handshake state are the result of events that
29 * occur within the Message flow state machine.
31 * Overall it looks like this:
33 * --------------------------------------------- -------------------
35 * | Message flow state machine | | |
37 * | -------------------- -------------------- | Transition | Handshake state |
38 * | | MSG_FLOW_READING | | MSG_FLOW_WRITING | | Event | machine |
39 * | | sub-state | | sub-state | |----------->| |
40 * | | machine for | | machine for | | | |
41 * | | reading messages | | writing messages | | | |
42 * | -------------------- -------------------- | | |
44 * --------------------------------------------- -------------------
48 /* Sub state machine return values */
50 /* Something bad happened or NBIO */
52 /* Sub state finished go to the next sub state */
54 /* Sub state finished and handshake was completed */
55 SUB_STATE_END_HANDSHAKE
58 static int state_machine(SSL
*s
, int server
);
59 static void init_read_state_machine(SSL
*s
);
60 static SUB_STATE_RETURN
read_state_machine(SSL
*s
);
61 static void init_write_state_machine(SSL
*s
);
62 static SUB_STATE_RETURN
write_state_machine(SSL
*s
);
64 OSSL_HANDSHAKE_STATE
SSL_get_state(const SSL
*ssl
)
66 return ssl
->statem
.hand_state
;
69 int SSL_in_init(SSL
*s
)
71 return s
->statem
.in_init
;
74 int SSL_is_init_finished(SSL
*s
)
76 return !(s
->statem
.in_init
) && (s
->statem
.hand_state
== TLS_ST_OK
);
79 int SSL_in_before(SSL
*s
)
82 * Historically being "in before" meant before anything had happened. In the
83 * current code though we remain in the "before" state for a while after we
84 * have started the handshake process (e.g. as a server waiting for the
85 * first message to arrive). There "in before" is taken to mean "in before"
86 * and not started any handshake process yet.
88 return (s
->statem
.hand_state
== TLS_ST_BEFORE
)
89 && (s
->statem
.state
== MSG_FLOW_UNINITED
);
93 * Clear the state machine state and reset back to MSG_FLOW_UNINITED
95 void ossl_statem_clear(SSL
*s
)
97 s
->statem
.state
= MSG_FLOW_UNINITED
;
98 s
->statem
.hand_state
= TLS_ST_BEFORE
;
99 s
->statem
.in_init
= 1;
100 s
->statem
.no_cert_verify
= 0;
104 * Set the state machine up ready for a renegotiation handshake
106 void ossl_statem_set_renegotiate(SSL
*s
)
108 s
->statem
.in_init
= 1;
109 s
->statem
.request_state
= TLS_ST_SW_HELLO_REQ
;
113 * Put the state machine into an error state. This is a permanent error for
114 * the current connection.
116 void ossl_statem_set_error(SSL
*s
)
118 s
->statem
.state
= MSG_FLOW_ERROR
;
122 * Discover whether the current connection is in the error state.
124 * Valid return values are:
128 int ossl_statem_in_error(const SSL
*s
)
130 if (s
->statem
.state
== MSG_FLOW_ERROR
)
136 void ossl_statem_set_in_init(SSL
*s
, int init
)
138 s
->statem
.in_init
= init
;
141 int ossl_statem_get_in_handshake(SSL
*s
)
143 return s
->statem
.in_handshake
;
146 void ossl_statem_set_in_handshake(SSL
*s
, int inhand
)
149 s
->statem
.in_handshake
++;
151 s
->statem
.in_handshake
--;
154 /* Are we in a sensible state to skip over unreadable early data? */
155 int ossl_statem_skip_early_data(SSL
*s
)
157 if (s
->ext
.early_data
!= SSL_EARLY_DATA_REJECTED
)
160 if (s
->hello_retry_request
) {
161 if (s
->statem
.hand_state
!= TLS_ST_SW_HELLO_RETRY_REQUEST
)
164 if (!s
->server
|| s
->statem
.hand_state
!= TLS_ST_EARLY_DATA
)
172 * Called when we are in SSL_read*(), SSL_write*(), or SSL_accept()
173 * /SSL_connect()/SSL_do_handshake(). Used to test whether we are in an early
174 * data state and whether we should attempt to move the handshake on if so.
175 * |send| is 1 if we are attempting to send data (SSL_write*()), 0 if we are
176 * attempting to read data (SSL_read*()), or -1 if we are in SSL_do_handshake()
179 void ossl_statem_check_finish_init(SSL
*s
, int send
)
182 if (s
->statem
.hand_state
== TLS_ST_PENDING_EARLY_DATA_END
183 || s
->statem
.hand_state
== TLS_ST_EARLY_DATA
) {
184 ossl_statem_set_in_init(s
, 1);
185 if (s
->early_data_state
== SSL_EARLY_DATA_WRITE_RETRY
) {
187 * SSL_connect() or SSL_do_handshake() has been called directly.
188 * We don't allow any more writing of early data.
190 s
->early_data_state
= SSL_EARLY_DATA_FINISHED_WRITING
;
193 } else if (!s
->server
) {
194 if ((send
&& (s
->statem
.hand_state
== TLS_ST_PENDING_EARLY_DATA_END
195 || s
->statem
.hand_state
== TLS_ST_EARLY_DATA
)
196 && s
->early_data_state
!= SSL_EARLY_DATA_WRITING
)
197 || (!send
&& s
->statem
.hand_state
== TLS_ST_EARLY_DATA
)) {
198 ossl_statem_set_in_init(s
, 1);
200 * SSL_write() has been called directly. We don't allow any more
201 * writing of early data.
203 if (send
&& s
->early_data_state
== SSL_EARLY_DATA_WRITE_RETRY
)
204 s
->early_data_state
= SSL_EARLY_DATA_FINISHED_WRITING
;
207 if (s
->early_data_state
== SSL_EARLY_DATA_FINISHED_READING
208 && s
->statem
.hand_state
== TLS_ST_EARLY_DATA
)
209 ossl_statem_set_in_init(s
, 1);
213 void ossl_statem_set_hello_verify_done(SSL
*s
)
215 s
->statem
.state
= MSG_FLOW_UNINITED
;
216 s
->statem
.in_init
= 1;
218 * This will get reset (briefly) back to TLS_ST_BEFORE when we enter
219 * state_machine() because |state| is MSG_FLOW_UNINITED, but until then any
220 * calls to SSL_in_before() will return false. Also calls to
221 * SSL_state_string() and SSL_state_string_long() will return something
224 s
->statem
.hand_state
= TLS_ST_SR_CLNT_HELLO
;
227 int ossl_statem_connect(SSL
*s
)
229 return state_machine(s
, 0);
232 int ossl_statem_accept(SSL
*s
)
234 return state_machine(s
, 1);
237 typedef void (*info_cb
) (const SSL
*, int, int);
239 static info_cb
get_callback(SSL
*s
)
241 if (s
->info_callback
!= NULL
)
242 return s
->info_callback
;
243 else if (s
->ctx
->info_callback
!= NULL
)
244 return s
->ctx
->info_callback
;
250 * The main message flow state machine. We start in the MSG_FLOW_UNINITED or
251 * MSG_FLOW_FINISHED state and finish in MSG_FLOW_FINISHED. Valid states and
252 * transitions are as follows:
254 * MSG_FLOW_UNINITED MSG_FLOW_FINISHED
256 * +-----------------------+
258 * MSG_FLOW_WRITING <---> MSG_FLOW_READING
266 * We may exit at any point due to an error or NBIO event. If an NBIO event
267 * occurs then we restart at the point we left off when we are recalled.
268 * MSG_FLOW_WRITING and MSG_FLOW_READING have sub-state machines associated with them.
270 * In addition to the above there is also the MSG_FLOW_ERROR state. We can move
271 * into that state at any point in the event that an irrecoverable error occurs.
273 * Valid return values are:
277 static int state_machine(SSL
*s
, int server
)
280 unsigned long Time
= (unsigned long)time(NULL
);
281 void (*cb
) (const SSL
*ssl
, int type
, int val
) = NULL
;
282 OSSL_STATEM
*st
= &s
->statem
;
286 if (st
->state
== MSG_FLOW_ERROR
) {
287 /* Shouldn't have been called if we're already in the error state */
291 RAND_add(&Time
, sizeof(Time
), 0);
295 cb
= get_callback(s
);
298 if (!SSL_in_init(s
) || SSL_in_before(s
)) {
302 #ifndef OPENSSL_NO_SCTP
303 if (SSL_IS_DTLS(s
)) {
305 * Notify SCTP BIO socket to enter handshake mode and prevent stream
306 * identifier other than 0. Will be ignored if no SCTP is used.
308 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE
,
309 st
->in_handshake
, NULL
);
313 /* Initialise state machine */
314 if (st
->state
== MSG_FLOW_UNINITED
315 || st
->state
== MSG_FLOW_FINISHED
) {
316 if (st
->state
== MSG_FLOW_UNINITED
) {
317 st
->hand_state
= TLS_ST_BEFORE
;
318 st
->request_state
= TLS_ST_BEFORE
;
323 cb(s
, SSL_CB_HANDSHAKE_START
, 1);
325 if (SSL_IS_DTLS(s
)) {
326 if ((s
->version
& 0xff00) != (DTLS1_VERSION
& 0xff00) &&
327 (server
|| (s
->version
& 0xff00) != (DTLS1_BAD_VER
& 0xff00))) {
328 SSLerr(SSL_F_STATE_MACHINE
, ERR_R_INTERNAL_ERROR
);
332 if ((s
->version
>> 8) != SSL3_VERSION_MAJOR
) {
333 SSLerr(SSL_F_STATE_MACHINE
, ERR_R_INTERNAL_ERROR
);
338 if (!ssl_security(s
, SSL_SECOP_VERSION
, 0, s
->version
, NULL
)) {
339 SSLerr(SSL_F_STATE_MACHINE
, SSL_R_VERSION_TOO_LOW
);
343 if (s
->init_buf
== NULL
) {
344 if ((buf
= BUF_MEM_new()) == NULL
) {
347 if (!BUF_MEM_grow(buf
, SSL3_RT_MAX_PLAIN_LENGTH
)) {
354 if (!ssl3_setup_buffers(s
)) {
360 * Should have been reset by tls_process_finished, too.
362 s
->s3
->change_cipher_spec
= 0;
365 * Ok, we now need to push on a buffering BIO ...but not with
368 #ifndef OPENSSL_NO_SCTP
369 if (!SSL_IS_DTLS(s
) || !BIO_dgram_is_sctp(SSL_get_wbio(s
)))
371 if (!ssl_init_wbio_buffer(s
)) {
375 if ((SSL_in_before(s
))
377 if (!tls_setup_handshake(s
)) {
378 ossl_statem_set_error(s
);
382 if (SSL_IS_FIRST_HANDSHAKE(s
))
383 st
->read_state_first_init
= 1;
386 st
->state
= MSG_FLOW_WRITING
;
387 init_write_state_machine(s
);
390 while (st
->state
!= MSG_FLOW_FINISHED
) {
391 if (st
->state
== MSG_FLOW_READING
) {
392 ssret
= read_state_machine(s
);
393 if (ssret
== SUB_STATE_FINISHED
) {
394 st
->state
= MSG_FLOW_WRITING
;
395 init_write_state_machine(s
);
400 } else if (st
->state
== MSG_FLOW_WRITING
) {
401 ssret
= write_state_machine(s
);
402 if (ssret
== SUB_STATE_FINISHED
) {
403 st
->state
= MSG_FLOW_READING
;
404 init_read_state_machine(s
);
405 } else if (ssret
== SUB_STATE_END_HANDSHAKE
) {
406 st
->state
= MSG_FLOW_FINISHED
;
413 ossl_statem_set_error(s
);
423 #ifndef OPENSSL_NO_SCTP
424 if (SSL_IS_DTLS(s
)) {
426 * Notify SCTP BIO socket to leave handshake mode and allow stream
427 * identifier other than 0. Will be ignored if no SCTP is used.
429 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE
,
430 st
->in_handshake
, NULL
);
437 cb(s
, SSL_CB_ACCEPT_EXIT
, ret
);
439 cb(s
, SSL_CB_CONNECT_EXIT
, ret
);
445 * Initialise the MSG_FLOW_READING sub-state machine
447 static void init_read_state_machine(SSL
*s
)
449 OSSL_STATEM
*st
= &s
->statem
;
451 st
->read_state
= READ_STATE_HEADER
;
454 static int grow_init_buf(SSL
*s
, size_t size
) {
456 size_t msg_offset
= (char *)s
->init_msg
- s
->init_buf
->data
;
458 if (!BUF_MEM_grow_clean(s
->init_buf
, (int)size
))
461 if (size
< msg_offset
)
464 s
->init_msg
= s
->init_buf
->data
+ msg_offset
;
470 * This function implements the sub-state machine when the message flow is in
471 * MSG_FLOW_READING. The valid sub-states and transitions are:
473 * READ_STATE_HEADER <--+<-------------+
476 * READ_STATE_BODY -----+-->READ_STATE_POST_PROCESS
478 * +----------------------------+
480 * [SUB_STATE_FINISHED]
482 * READ_STATE_HEADER has the responsibility for reading in the message header
483 * and transitioning the state of the handshake state machine.
485 * READ_STATE_BODY reads in the rest of the message and then subsequently
488 * READ_STATE_POST_PROCESS is an optional step that may occur if some post
489 * processing activity performed on the message may block.
491 * Any of the above states could result in an NBIO event occurring in which case
492 * control returns to the calling application. When this function is recalled we
493 * will resume in the same state where we left off.
495 static SUB_STATE_RETURN
read_state_machine(SSL
*s
)
497 OSSL_STATEM
*st
= &s
->statem
;
500 int (*transition
) (SSL
*s
, int mt
);
502 MSG_PROCESS_RETURN(*process_message
) (SSL
*s
, PACKET
*pkt
);
503 WORK_STATE(*post_process_message
) (SSL
*s
, WORK_STATE wst
);
504 size_t (*max_message_size
) (SSL
*s
);
505 void (*cb
) (const SSL
*ssl
, int type
, int val
) = NULL
;
507 cb
= get_callback(s
);
510 transition
= ossl_statem_server_read_transition
;
511 process_message
= ossl_statem_server_process_message
;
512 max_message_size
= ossl_statem_server_max_message_size
;
513 post_process_message
= ossl_statem_server_post_process_message
;
515 transition
= ossl_statem_client_read_transition
;
516 process_message
= ossl_statem_client_process_message
;
517 max_message_size
= ossl_statem_client_max_message_size
;
518 post_process_message
= ossl_statem_client_post_process_message
;
521 if (st
->read_state_first_init
) {
523 st
->read_state_first_init
= 0;
527 switch (st
->read_state
) {
528 case READ_STATE_HEADER
:
529 /* Get the state the peer wants to move to */
530 if (SSL_IS_DTLS(s
)) {
532 * In DTLS we get the whole message in one go - header and body
534 ret
= dtls_get_message(s
, &mt
, &len
);
536 ret
= tls_get_message_header(s
, &mt
);
540 /* Could be non-blocking IO */
541 return SUB_STATE_ERROR
;
545 /* Notify callback of an impending state change */
547 cb(s
, SSL_CB_ACCEPT_LOOP
, 1);
549 cb(s
, SSL_CB_CONNECT_LOOP
, 1);
552 * Validate that we are allowed to move to the new state and move
553 * to that state if so
555 if (!transition(s
, mt
)) {
556 ossl_statem_set_error(s
);
557 return SUB_STATE_ERROR
;
560 if (s
->s3
->tmp
.message_size
> max_message_size(s
)) {
561 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL_AD_ILLEGAL_PARAMETER
);
562 SSLerr(SSL_F_READ_STATE_MACHINE
, SSL_R_EXCESSIVE_MESSAGE_SIZE
);
563 return SUB_STATE_ERROR
;
566 /* dtls_get_message already did this */
568 && s
->s3
->tmp
.message_size
> 0
569 && !grow_init_buf(s
, s
->s3
->tmp
.message_size
570 + SSL3_HM_HEADER_LENGTH
)) {
571 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL_AD_INTERNAL_ERROR
);
572 SSLerr(SSL_F_READ_STATE_MACHINE
, ERR_R_BUF_LIB
);
573 return SUB_STATE_ERROR
;
576 st
->read_state
= READ_STATE_BODY
;
579 case READ_STATE_BODY
:
580 if (!SSL_IS_DTLS(s
)) {
581 /* We already got this above for DTLS */
582 ret
= tls_get_message_body(s
, &len
);
584 /* Could be non-blocking IO */
585 return SUB_STATE_ERROR
;
590 if (!PACKET_buf_init(&pkt
, s
->init_msg
, len
)) {
591 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL_AD_INTERNAL_ERROR
);
592 SSLerr(SSL_F_READ_STATE_MACHINE
, ERR_R_INTERNAL_ERROR
);
593 return SUB_STATE_ERROR
;
595 ret
= process_message(s
, &pkt
);
597 /* Discard the packet data */
601 case MSG_PROCESS_ERROR
:
602 return SUB_STATE_ERROR
;
604 case MSG_PROCESS_FINISHED_READING
:
605 if (SSL_IS_DTLS(s
)) {
608 return SUB_STATE_FINISHED
;
610 case MSG_PROCESS_CONTINUE_PROCESSING
:
611 st
->read_state
= READ_STATE_POST_PROCESS
;
612 st
->read_state_work
= WORK_MORE_A
;
616 st
->read_state
= READ_STATE_HEADER
;
621 case READ_STATE_POST_PROCESS
:
622 st
->read_state_work
= post_process_message(s
, st
->read_state_work
);
623 switch (st
->read_state_work
) {
628 return SUB_STATE_ERROR
;
630 case WORK_FINISHED_CONTINUE
:
631 st
->read_state
= READ_STATE_HEADER
;
634 case WORK_FINISHED_STOP
:
635 if (SSL_IS_DTLS(s
)) {
638 return SUB_STATE_FINISHED
;
643 /* Shouldn't happen */
644 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL_AD_INTERNAL_ERROR
);
645 SSLerr(SSL_F_READ_STATE_MACHINE
, ERR_R_INTERNAL_ERROR
);
646 ossl_statem_set_error(s
);
647 return SUB_STATE_ERROR
;
653 * Send a previously constructed message to the peer.
655 static int statem_do_write(SSL
*s
)
657 OSSL_STATEM
*st
= &s
->statem
;
659 if (st
->hand_state
== TLS_ST_CW_CHANGE
660 || st
->hand_state
== TLS_ST_SW_CHANGE
) {
662 return dtls1_do_write(s
, SSL3_RT_CHANGE_CIPHER_SPEC
);
664 return ssl3_do_write(s
, SSL3_RT_CHANGE_CIPHER_SPEC
);
666 return ssl_do_write(s
);
671 * Initialise the MSG_FLOW_WRITING sub-state machine
673 static void init_write_state_machine(SSL
*s
)
675 OSSL_STATEM
*st
= &s
->statem
;
677 st
->write_state
= WRITE_STATE_TRANSITION
;
681 * This function implements the sub-state machine when the message flow is in
682 * MSG_FLOW_WRITING. The valid sub-states and transitions are:
684 * +-> WRITE_STATE_TRANSITION ------> [SUB_STATE_FINISHED]
687 * | WRITE_STATE_PRE_WORK -----> [SUB_STATE_END_HANDSHAKE]
693 * | WRITE_STATE_POST_WORK
697 * WRITE_STATE_TRANSITION transitions the state of the handshake state machine
699 * WRITE_STATE_PRE_WORK performs any work necessary to prepare the later
700 * sending of the message. This could result in an NBIO event occurring in
701 * which case control returns to the calling application. When this function
702 * is recalled we will resume in the same state where we left off.
704 * WRITE_STATE_SEND sends the message and performs any work to be done after
707 * WRITE_STATE_POST_WORK performs any work necessary after the sending of the
708 * message has been completed. As for WRITE_STATE_PRE_WORK this could also
709 * result in an NBIO event.
711 static SUB_STATE_RETURN
write_state_machine(SSL
*s
)
713 OSSL_STATEM
*st
= &s
->statem
;
715 WRITE_TRAN(*transition
) (SSL
*s
);
716 WORK_STATE(*pre_work
) (SSL
*s
, WORK_STATE wst
);
717 WORK_STATE(*post_work
) (SSL
*s
, WORK_STATE wst
);
718 int (*get_construct_message_f
) (SSL
*s
, WPACKET
*pkt
,
719 int (**confunc
) (SSL
*s
, WPACKET
*pkt
),
721 void (*cb
) (const SSL
*ssl
, int type
, int val
) = NULL
;
722 int (*confunc
) (SSL
*s
, WPACKET
*pkt
);
726 cb
= get_callback(s
);
729 transition
= ossl_statem_server_write_transition
;
730 pre_work
= ossl_statem_server_pre_work
;
731 post_work
= ossl_statem_server_post_work
;
732 get_construct_message_f
= ossl_statem_server_construct_message
;
734 transition
= ossl_statem_client_write_transition
;
735 pre_work
= ossl_statem_client_pre_work
;
736 post_work
= ossl_statem_client_post_work
;
737 get_construct_message_f
= ossl_statem_client_construct_message
;
741 switch (st
->write_state
) {
742 case WRITE_STATE_TRANSITION
:
744 /* Notify callback of an impending state change */
746 cb(s
, SSL_CB_ACCEPT_LOOP
, 1);
748 cb(s
, SSL_CB_CONNECT_LOOP
, 1);
750 switch (transition(s
)) {
751 case WRITE_TRAN_CONTINUE
:
752 st
->write_state
= WRITE_STATE_PRE_WORK
;
753 st
->write_state_work
= WORK_MORE_A
;
756 case WRITE_TRAN_FINISHED
:
757 return SUB_STATE_FINISHED
;
760 case WRITE_TRAN_ERROR
:
761 return SUB_STATE_ERROR
;
765 case WRITE_STATE_PRE_WORK
:
766 switch (st
->write_state_work
= pre_work(s
, st
->write_state_work
)) {
771 return SUB_STATE_ERROR
;
773 case WORK_FINISHED_CONTINUE
:
774 st
->write_state
= WRITE_STATE_SEND
;
777 case WORK_FINISHED_STOP
:
778 return SUB_STATE_END_HANDSHAKE
;
780 if (!get_construct_message_f(s
, &pkt
, &confunc
, &mt
)) {
781 ossl_statem_set_error(s
);
782 return SUB_STATE_ERROR
;
784 if (mt
== SSL3_MT_DUMMY
) {
785 /* Skip construction and sending. This isn't a "real" state */
786 st
->write_state
= WRITE_STATE_POST_WORK
;
787 st
->write_state_work
= WORK_MORE_A
;
790 if (!WPACKET_init(&pkt
, s
->init_buf
)
791 || !ssl_set_handshake_header(s
, &pkt
, mt
)
792 || (confunc
!= NULL
&& !confunc(s
, &pkt
))
793 || !ssl_close_construct_packet(s
, &pkt
, mt
)
794 || !WPACKET_finish(&pkt
)) {
795 WPACKET_cleanup(&pkt
);
796 ossl_statem_set_error(s
);
797 return SUB_STATE_ERROR
;
802 case WRITE_STATE_SEND
:
803 if (SSL_IS_DTLS(s
) && st
->use_timer
) {
804 dtls1_start_timer(s
);
806 ret
= statem_do_write(s
);
808 return SUB_STATE_ERROR
;
810 st
->write_state
= WRITE_STATE_POST_WORK
;
811 st
->write_state_work
= WORK_MORE_A
;
814 case WRITE_STATE_POST_WORK
:
815 switch (st
->write_state_work
= post_work(s
, st
->write_state_work
)) {
820 return SUB_STATE_ERROR
;
822 case WORK_FINISHED_CONTINUE
:
823 st
->write_state
= WRITE_STATE_TRANSITION
;
826 case WORK_FINISHED_STOP
:
827 return SUB_STATE_END_HANDSHAKE
;
832 return SUB_STATE_ERROR
;
838 * Flush the write BIO
840 int statem_flush(SSL
*s
)
842 s
->rwstate
= SSL_WRITING
;
843 if (BIO_flush(s
->wbio
) <= 0) {
846 s
->rwstate
= SSL_NOTHING
;
852 * Called by the record layer to determine whether application data is
853 * allowed to be received in the current handshake state or not.
856 * 1: Yes (application data allowed)
857 * 0: No (application data not allowed)
859 int ossl_statem_app_data_allowed(SSL
*s
)
861 OSSL_STATEM
*st
= &s
->statem
;
863 if (st
->state
== MSG_FLOW_UNINITED
)
866 if (!s
->s3
->in_read_app_data
|| (s
->s3
->total_renegotiations
== 0))
871 * If we're a server and we haven't got as far as writing our
872 * ServerHello yet then we allow app data
874 if (st
->hand_state
== TLS_ST_BEFORE
875 || st
->hand_state
== TLS_ST_SR_CLNT_HELLO
)
879 * If we're a client and we haven't read the ServerHello yet then we
882 if (st
->hand_state
== TLS_ST_CW_CLNT_HELLO
)
889 #ifndef OPENSSL_NO_SCTP
891 * Set flag used by SCTP to determine whether we are in the read sock state
893 void ossl_statem_set_sctp_read_sock(SSL
*s
, int read_sock
)
895 s
->statem
.in_sctp_read_sock
= read_sock
;
899 * Called by the record layer to determine whether we are in the read sock
903 * 1: Yes (we are in the read sock state)
904 * 0: No (we are not in the read sock state)
906 int ossl_statem_in_sctp_read_sock(SSL
*s
)
908 return s
->statem
.in_sctp_read_sock
;