2 * Written by Matt Caswell for the OpenSSL project.
4 /* ====================================================================
5 * Copyright (c) 1998-2015 The OpenSSL Project. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * openssl-core@openssl.org.
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
33 * 6. Redistributions of any form whatsoever must retain the following
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com).
58 #include <openssl/rand.h>
59 #include "../ssl_locl.h"
60 #include "statem_locl.h"
63 * This file implements the SSL/TLS/DTLS state machines.
65 * There are two primary state machines:
67 * 1) Message flow state machine
68 * 2) Handshake state machine
70 * The Message flow state machine controls the reading and sending of messages
71 * including handling of non-blocking IO events, flushing of the underlying
72 * write BIO, handling unexpected messages, etc. It is itself broken into two
73 * separate sub-state machines which control reading and writing respectively.
75 * The Handshake state machine keeps track of the current SSL/TLS handshake
76 * state. Transitions of the handshake state are the result of events that
77 * occur within the Message flow state machine.
79 * Overall it looks like this:
81 * --------------------------------------------- -------------------
83 * | Message flow state machine | | |
85 * | -------------------- -------------------- | Transition | Handshake state |
86 * | | MSG_FLOW_READING | | MSG_FLOW_WRITING | | Event | machine |
87 * | | sub-state | | sub-state | |----------->| |
88 * | | machine for | | machine for | | | |
89 * | | reading messages | | writing messages | | | |
90 * | -------------------- -------------------- | | |
92 * --------------------------------------------- -------------------
96 /* Sub state machine return values */
98 /* Something bad happened or NBIO */
100 /* Sub state finished go to the next sub state */
102 /* Sub state finished and handshake was completed */
103 SUB_STATE_END_HANDSHAKE
106 static int state_machine(SSL
*s
, int server
);
107 static void init_read_state_machine(SSL
*s
);
108 static SUB_STATE_RETURN
read_state_machine(SSL
*s
);
109 static void init_write_state_machine(SSL
*s
);
110 static SUB_STATE_RETURN
write_state_machine(SSL
*s
);
112 OSSL_HANDSHAKE_STATE
SSL_get_state(const SSL
*ssl
)
114 return ssl
->statem
.hand_state
;
117 int SSL_in_init(SSL
*s
)
119 return s
->statem
.in_init
;
122 int SSL_is_init_finished(SSL
*s
)
124 return !(s
->statem
.in_init
) && (s
->statem
.hand_state
== TLS_ST_OK
);
127 int SSL_in_before(SSL
*s
)
130 * Historically being "in before" meant before anything had happened. In the
131 * current code though we remain in the "before" state for a while after we
132 * have started the handshake process (e.g. as a server waiting for the
133 * first message to arrive). There "in before" is taken to mean "in before"
134 * and not started any handshake process yet.
136 return (s
->statem
.hand_state
== TLS_ST_BEFORE
)
137 && (s
->statem
.state
== MSG_FLOW_UNINITED
);
141 * Clear the state machine state and reset back to MSG_FLOW_UNINITED
143 void ossl_statem_clear(SSL
*s
)
145 s
->statem
.state
= MSG_FLOW_UNINITED
;
146 s
->statem
.hand_state
= TLS_ST_BEFORE
;
147 s
->statem
.in_init
= 1;
148 s
->statem
.no_cert_verify
= 0;
152 * Set the state machine up ready for a renegotiation handshake
154 void ossl_statem_set_renegotiate(SSL
*s
)
156 s
->statem
.state
= MSG_FLOW_RENEGOTIATE
;
157 s
->statem
.in_init
= 1;
161 * Put the state machine into an error state. This is a permanent error for
162 * the current connection.
164 void ossl_statem_set_error(SSL
*s
)
166 s
->statem
.state
= MSG_FLOW_ERROR
;
170 * Discover whether the current connection is in the error state.
172 * Valid return values are:
176 int ossl_statem_in_error(const SSL
*s
)
178 if (s
->statem
.state
== MSG_FLOW_ERROR
)
184 void ossl_statem_set_in_init(SSL
*s
, int init
)
186 s
->statem
.in_init
= init
;
189 int ossl_statem_get_in_handshake(SSL
*s
)
191 return s
->statem
.in_handshake
;
194 void ossl_statem_set_in_handshake(SSL
*s
, int inhand
)
197 s
->statem
.in_handshake
++;
199 s
->statem
.in_handshake
--;
202 void ossl_statem_set_hello_verify_done(SSL
*s
)
204 s
->statem
.state
= MSG_FLOW_UNINITED
;
205 s
->statem
.in_init
= 1;
207 * This will get reset (briefly) back to TLS_ST_BEFORE when we enter
208 * state_machine() because |state| is MSG_FLOW_UNINITED, but until then any
209 * calls to SSL_in_before() will return false. Also calls to
210 * SSL_state_string() and SSL_state_string_long() will return something
213 s
->statem
.hand_state
= TLS_ST_SR_CLNT_HELLO
;
216 int ossl_statem_connect(SSL
*s
) {
217 return state_machine(s
, 0);
220 int ossl_statem_accept(SSL
*s
)
222 return state_machine(s
, 1);
225 static void (*get_callback(SSL
*s
))(const SSL
*, int, int)
227 if (s
->info_callback
!= NULL
)
228 return s
->info_callback
;
229 else if (s
->ctx
->info_callback
!= NULL
)
230 return s
->ctx
->info_callback
;
236 * The main message flow state machine. We start in the MSG_FLOW_UNINITED or
237 * MSG_FLOW_RENEGOTIATE state and finish in MSG_FLOW_FINISHED. Valid states and
238 * transitions are as follows:
240 * MSG_FLOW_UNINITED MSG_FLOW_RENEGOTIATE
242 * +-----------------------+
244 * MSG_FLOW_WRITING <---> MSG_FLOW_READING
252 * We may exit at any point due to an error or NBIO event. If an NBIO event
253 * occurs then we restart at the point we left off when we are recalled.
254 * MSG_FLOW_WRITING and MSG_FLOW_READING have sub-state machines associated with them.
256 * In addition to the above there is also the MSG_FLOW_ERROR state. We can move
257 * into that state at any point in the event that an irrecoverable error occurs.
259 * Valid return values are:
263 static int state_machine(SSL
*s
, int server
)
266 unsigned long Time
= (unsigned long)time(NULL
);
267 void (*cb
) (const SSL
*ssl
, int type
, int val
) = NULL
;
268 OSSL_STATEM
*st
= &s
->statem
;
272 if (st
->state
== MSG_FLOW_ERROR
) {
273 /* Shouldn't have been called if we're already in the error state */
277 RAND_add(&Time
, sizeof(Time
), 0);
281 cb
= get_callback(s
);
284 if (!SSL_in_init(s
) || SSL_in_before(s
)) {
289 #ifndef OPENSSL_NO_SCTP
290 if (SSL_IS_DTLS(s
)) {
292 * Notify SCTP BIO socket to enter handshake mode and prevent stream
293 * identifier other than 0. Will be ignored if no SCTP is used.
295 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE
,
296 st
->in_handshake
, NULL
);
300 #ifndef OPENSSL_NO_HEARTBEATS
302 * If we're awaiting a HeartbeatResponse, pretend we already got and
303 * don't await it anymore, because Heartbeats don't make sense during
306 if (s
->tlsext_hb_pending
) {
309 s
->tlsext_hb_pending
= 0;
314 /* Initialise state machine */
316 if (st
->state
== MSG_FLOW_RENEGOTIATE
) {
319 s
->ctx
->stats
.sess_connect_renegotiate
++;
322 if (st
->state
== MSG_FLOW_UNINITED
|| st
->state
== MSG_FLOW_RENEGOTIATE
) {
323 if (st
->state
== MSG_FLOW_UNINITED
) {
324 st
->hand_state
= TLS_ST_BEFORE
;
329 cb(s
, SSL_CB_HANDSHAKE_START
, 1);
331 if (SSL_IS_DTLS(s
)) {
332 if ((s
->version
& 0xff00) != (DTLS1_VERSION
& 0xff00) &&
334 || (s
->version
& 0xff00) != (DTLS1_BAD_VER
& 0xff00))) {
335 SSLerr(SSL_F_STATE_MACHINE
, ERR_R_INTERNAL_ERROR
);
339 if ((s
->version
>> 8) != SSL3_VERSION_MAJOR
) {
340 SSLerr(SSL_F_STATE_MACHINE
, ERR_R_INTERNAL_ERROR
);
345 if (!ssl_security(s
, SSL_SECOP_VERSION
, 0, s
->version
, NULL
)) {
346 SSLerr(SSL_F_STATE_MACHINE
, SSL_R_VERSION_TOO_LOW
);
350 if (s
->init_buf
== NULL
) {
351 if ((buf
= BUF_MEM_new()) == NULL
) {
354 if (!BUF_MEM_grow(buf
, SSL3_RT_MAX_PLAIN_LENGTH
)) {
361 if (!ssl3_setup_buffers(s
)) {
367 * Should have been reset by tls_process_finished, too.
369 s
->s3
->change_cipher_spec
= 0;
371 if (!server
|| st
->state
!= MSG_FLOW_RENEGOTIATE
) {
373 * Ok, we now need to push on a buffering BIO ...but not with
376 #ifndef OPENSSL_NO_SCTP
377 if (!SSL_IS_DTLS(s
) || !BIO_dgram_is_sctp(SSL_get_wbio(s
)))
379 if (!ssl_init_wbio_buffer(s
, server
? 1 : 0)) {
383 ssl3_init_finished_mac(s
);
387 if (st
->state
!= MSG_FLOW_RENEGOTIATE
) {
388 s
->ctx
->stats
.sess_accept
++;
389 } else if (!s
->s3
->send_connection_binding
&&
391 SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION
)) {
393 * Server attempting to renegotiate with client that doesn't
394 * support secure renegotiation.
396 SSLerr(SSL_F_STATE_MACHINE
,
397 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED
);
398 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL_AD_HANDSHAKE_FAILURE
);
399 ossl_statem_set_error(s
);
403 * st->state == MSG_FLOW_RENEGOTIATE, we will just send a
406 s
->ctx
->stats
.sess_accept_renegotiate
++;
409 s
->ctx
->stats
.sess_connect
++;
411 /* mark client_random uninitialized */
412 memset(s
->s3
->client_random
, 0, sizeof(s
->s3
->client_random
));
415 s
->s3
->tmp
.cert_request
= 0;
417 if (SSL_IS_DTLS(s
)) {
422 st
->state
= MSG_FLOW_WRITING
;
423 init_write_state_machine(s
);
424 st
->read_state_first_init
= 1;
427 while(st
->state
!= MSG_FLOW_FINISHED
) {
428 if(st
->state
== MSG_FLOW_READING
) {
429 ssret
= read_state_machine(s
);
430 if (ssret
== SUB_STATE_FINISHED
) {
431 st
->state
= MSG_FLOW_WRITING
;
432 init_write_state_machine(s
);
437 } else if (st
->state
== MSG_FLOW_WRITING
) {
438 ssret
= write_state_machine(s
);
439 if (ssret
== SUB_STATE_FINISHED
) {
440 st
->state
= MSG_FLOW_READING
;
441 init_read_state_machine(s
);
442 } else if (ssret
== SUB_STATE_END_HANDSHAKE
) {
443 st
->state
= MSG_FLOW_FINISHED
;
450 ossl_statem_set_error(s
);
455 st
->state
= MSG_FLOW_UNINITED
;
461 #ifndef OPENSSL_NO_SCTP
462 if (SSL_IS_DTLS(s
)) {
464 * Notify SCTP BIO socket to leave handshake mode and allow stream
465 * identifier other than 0. Will be ignored if no SCTP is used.
467 BIO_ctrl(SSL_get_wbio(s
), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE
,
468 st
->in_handshake
, NULL
);
475 cb(s
, SSL_CB_ACCEPT_EXIT
, ret
);
477 cb(s
, SSL_CB_CONNECT_EXIT
, ret
);
483 * Initialise the MSG_FLOW_READING sub-state machine
485 static void init_read_state_machine(SSL
*s
)
487 OSSL_STATEM
*st
= &s
->statem
;
489 st
->read_state
= READ_STATE_HEADER
;
493 * This function implements the sub-state machine when the message flow is in
494 * MSG_FLOW_READING. The valid sub-states and transitions are:
496 * READ_STATE_HEADER <--+<-------------+
499 * READ_STATE_BODY -----+-->READ_STATE_POST_PROCESS
501 * +----------------------------+
503 * [SUB_STATE_FINISHED]
505 * READ_STATE_HEADER has the responsibility for reading in the message header
506 * and transitioning the state of the handshake state machine.
508 * READ_STATE_BODY reads in the rest of the message and then subsequently
511 * READ_STATE_POST_PROCESS is an optional step that may occur if some post
512 * processing activity performed on the message may block.
514 * Any of the above states could result in an NBIO event occuring in which case
515 * control returns to the calling application. When this function is recalled we
516 * will resume in the same state where we left off.
518 static SUB_STATE_RETURN
read_state_machine(SSL
*s
) {
519 OSSL_STATEM
*st
= &s
->statem
;
521 unsigned long len
= 0;
522 int (*transition
)(SSL
*s
, int mt
);
524 MSG_PROCESS_RETURN (*process_message
)(SSL
*s
, PACKET
*pkt
);
525 WORK_STATE (*post_process_message
)(SSL
*s
, WORK_STATE wst
);
526 unsigned long (*max_message_size
)(SSL
*s
);
527 void (*cb
) (const SSL
*ssl
, int type
, int val
) = NULL
;
529 cb
= get_callback(s
);
532 transition
= ossl_statem_server_read_transition
;
533 process_message
= ossl_statem_server_process_message
;
534 max_message_size
= ossl_statem_server_max_message_size
;
535 post_process_message
= ossl_statem_server_post_process_message
;
537 transition
= ossl_statem_client_read_transition
;
538 process_message
= ossl_statem_client_process_message
;
539 max_message_size
= ossl_statem_client_max_message_size
;
540 post_process_message
= ossl_statem_client_post_process_message
;
543 if (st
->read_state_first_init
) {
545 st
->read_state_first_init
= 0;
549 switch(st
->read_state
) {
550 case READ_STATE_HEADER
:
552 /* Get the state the peer wants to move to */
553 if (SSL_IS_DTLS(s
)) {
555 * In DTLS we get the whole message in one go - header and body
557 ret
= dtls_get_message(s
, &mt
, &len
);
559 ret
= tls_get_message_header(s
, &mt
);
563 /* Could be non-blocking IO */
564 return SUB_STATE_ERROR
;
568 /* Notify callback of an impending state change */
570 cb(s
, SSL_CB_ACCEPT_LOOP
, 1);
572 cb(s
, SSL_CB_CONNECT_LOOP
, 1);
575 * Validate that we are allowed to move to the new state and move
576 * to that state if so
578 if(!transition(s
, mt
)) {
579 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL3_AD_UNEXPECTED_MESSAGE
);
580 SSLerr(SSL_F_READ_STATE_MACHINE
, SSL_R_UNEXPECTED_MESSAGE
);
581 return SUB_STATE_ERROR
;
584 if (s
->s3
->tmp
.message_size
> max_message_size(s
)) {
585 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL_AD_ILLEGAL_PARAMETER
);
586 SSLerr(SSL_F_READ_STATE_MACHINE
, SSL_R_EXCESSIVE_MESSAGE_SIZE
);
587 return SUB_STATE_ERROR
;
590 st
->read_state
= READ_STATE_BODY
;
593 case READ_STATE_BODY
:
594 if (!SSL_IS_DTLS(s
)) {
595 /* We already got this above for DTLS */
596 ret
= tls_get_message_body(s
, &len
);
598 /* Could be non-blocking IO */
599 return SUB_STATE_ERROR
;
604 if (!PACKET_buf_init(&pkt
, s
->init_msg
, len
)) {
605 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL_AD_INTERNAL_ERROR
);
606 SSLerr(SSL_F_READ_STATE_MACHINE
, ERR_R_INTERNAL_ERROR
);
607 return SUB_STATE_ERROR
;
609 ret
= process_message(s
, &pkt
);
610 if (ret
== MSG_PROCESS_ERROR
) {
611 return SUB_STATE_ERROR
;
614 if (ret
== MSG_PROCESS_FINISHED_READING
) {
615 if (SSL_IS_DTLS(s
)) {
618 return SUB_STATE_FINISHED
;
621 if (ret
== MSG_PROCESS_CONTINUE_PROCESSING
) {
622 st
->read_state
= READ_STATE_POST_PROCESS
;
623 st
->read_state_work
= WORK_MORE_A
;
625 st
->read_state
= READ_STATE_HEADER
;
629 case READ_STATE_POST_PROCESS
:
630 st
->read_state_work
= post_process_message(s
, st
->read_state_work
);
631 switch(st
->read_state_work
) {
633 return SUB_STATE_ERROR
;
635 case WORK_FINISHED_CONTINUE
:
636 st
->read_state
= READ_STATE_HEADER
;
639 case WORK_FINISHED_STOP
:
640 if (SSL_IS_DTLS(s
)) {
643 return SUB_STATE_FINISHED
;
648 /* Shouldn't happen */
649 ssl3_send_alert(s
, SSL3_AL_FATAL
, SSL_AD_INTERNAL_ERROR
);
650 SSLerr(SSL_F_READ_STATE_MACHINE
, ERR_R_INTERNAL_ERROR
);
651 ossl_statem_set_error(s
);
652 return SUB_STATE_ERROR
;
658 * Send a previously constructed message to the peer.
660 static int statem_do_write(SSL
*s
)
662 OSSL_STATEM
*st
= &s
->statem
;
664 if (st
->hand_state
== TLS_ST_CW_CHANGE
665 || st
->hand_state
== TLS_ST_SW_CHANGE
) {
667 return dtls1_do_write(s
, SSL3_RT_CHANGE_CIPHER_SPEC
);
669 return ssl3_do_write(s
, SSL3_RT_CHANGE_CIPHER_SPEC
);
671 return ssl_do_write(s
);
676 * Initialise the MSG_FLOW_WRITING sub-state machine
678 static void init_write_state_machine(SSL
*s
)
680 OSSL_STATEM
*st
= &s
->statem
;
682 st
->write_state
= WRITE_STATE_TRANSITION
;
686 * This function implements the sub-state machine when the message flow is in
687 * MSG_FLOW_WRITING. The valid sub-states and transitions are:
689 * +-> WRITE_STATE_TRANSITION ------> [SUB_STATE_FINISHED]
692 * | WRITE_STATE_PRE_WORK -----> [SUB_STATE_END_HANDSHAKE]
698 * | WRITE_STATE_POST_WORK
702 * WRITE_STATE_TRANSITION transitions the state of the handshake state machine
704 * WRITE_STATE_PRE_WORK performs any work necessary to prepare the later
705 * sending of the message. This could result in an NBIO event occuring in
706 * which case control returns to the calling application. When this function
707 * is recalled we will resume in the same state where we left off.
709 * WRITE_STATE_SEND sends the message and performs any work to be done after
712 * WRITE_STATE_POST_WORK performs any work necessary after the sending of the
713 * message has been completed. As for WRITE_STATE_PRE_WORK this could also
714 * result in an NBIO event.
716 static SUB_STATE_RETURN
write_state_machine(SSL
*s
)
718 OSSL_STATEM
*st
= &s
->statem
;
720 WRITE_TRAN (*transition
)(SSL
*s
);
721 WORK_STATE (*pre_work
)(SSL
*s
, WORK_STATE wst
);
722 WORK_STATE (*post_work
)(SSL
*s
, WORK_STATE wst
);
723 int (*construct_message
)(SSL
*s
);
724 void (*cb
) (const SSL
*ssl
, int type
, int val
) = NULL
;
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 construct_message
= 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 construct_message
= 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
;
761 return SUB_STATE_ERROR
;
765 case WRITE_STATE_PRE_WORK
:
766 switch(st
->write_state_work
= pre_work(s
, st
->write_state_work
)) {
768 return SUB_STATE_ERROR
;
770 case WORK_FINISHED_CONTINUE
:
771 st
->write_state
= WRITE_STATE_SEND
;
774 case WORK_FINISHED_STOP
:
775 return SUB_STATE_END_HANDSHAKE
;
777 if(construct_message(s
) == 0)
778 return SUB_STATE_ERROR
;
782 case WRITE_STATE_SEND
:
783 if (SSL_IS_DTLS(s
) && st
->use_timer
) {
784 dtls1_start_timer(s
);
786 ret
= statem_do_write(s
);
788 return SUB_STATE_ERROR
;
790 st
->write_state
= WRITE_STATE_POST_WORK
;
791 st
->write_state_work
= WORK_MORE_A
;
794 case WRITE_STATE_POST_WORK
:
795 switch(st
->write_state_work
= post_work(s
, st
->write_state_work
)) {
797 return SUB_STATE_ERROR
;
799 case WORK_FINISHED_CONTINUE
:
800 st
->write_state
= WRITE_STATE_TRANSITION
;
803 case WORK_FINISHED_STOP
:
804 return SUB_STATE_END_HANDSHAKE
;
809 return SUB_STATE_ERROR
;
815 * Flush the write BIO
817 int statem_flush(SSL
*s
)
819 s
->rwstate
= SSL_WRITING
;
820 if (BIO_flush(s
->wbio
) <= 0) {
823 s
->rwstate
= SSL_NOTHING
;
829 * Called by the record layer to determine whether application data is
830 * allowed to be sent in the current handshake state or not.
833 * 1: Yes (application data allowed)
834 * 0: No (application data not allowed)
836 int ossl_statem_app_data_allowed(SSL
*s
)
838 OSSL_STATEM
*st
= &s
->statem
;
840 if (st
->state
== MSG_FLOW_UNINITED
|| st
->state
== MSG_FLOW_RENEGOTIATE
)
843 if (!s
->s3
->in_read_app_data
|| (s
->s3
->total_renegotiations
== 0))
848 * If we're a server and we haven't got as far as writing our
849 * ServerHello yet then we allow app data
851 if (st
->hand_state
== TLS_ST_BEFORE
852 || st
->hand_state
== TLS_ST_SR_CLNT_HELLO
)
856 * If we're a client and we haven't read the ServerHello yet then we
859 if (st
->hand_state
== TLS_ST_CW_CLNT_HELLO
)
866 #ifndef OPENSSL_NO_SCTP
868 * Set flag used by SCTP to determine whether we are in the read sock state
870 void ossl_statem_set_sctp_read_sock(SSL
*s
, int read_sock
)
872 s
->statem
.in_sctp_read_sock
= read_sock
;
876 * Called by the record layer to determine whether we are in the read sock
880 * 1: Yes (we are in the read sock state)
881 * 0: No (we are not in the read sock state)
883 int ossl_statem_in_sctp_read_sock(SSL
*s
)
885 return s
->statem
.in_sctp_read_sock
;