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openssl/ssl/statem/statem.c
Viktor Dukhovni 4fa52141b0 Protocol version selection and negotiation rewrite 
The protocol selection code is now consolidated in a few consecutive
short functions in a single file and is table driven.  Protocol-specific
constraints that influence negotiation are moved into the flags
field of the method structure.  The same protocol version constraints
are now applied in all code paths.  It is now much easier to add
new protocol versions without reworking the protocol selection
logic.

In the presence of "holes" in the list of enabled client protocols
we no longer select client protocols below the hole based on a
subset of the constraints and then fail shortly after when it is
found that these don't meet the remaining constraints (suiteb, FIPS,
security level, ...).  Ideally, with the new min/max controls users
will be less likely to create "holes" in the first place.

Reviewed-by: Kurt Roeckx <kurt@openssl.org>
2016-01-02 10:49:06 -05:00

889 lines
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/* ssl/statem/statem.c */
/*
* Written by Matt Caswell for the OpenSSL project.
*/
/* ====================================================================
* Copyright (c) 1998-2015 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <openssl/rand.h>
#include "../ssl_locl.h"
#include "statem_locl.h"
/*
* This file implements the SSL/TLS/DTLS state machines.
*
* There are two primary state machines:
*
* 1) Message flow state machine
* 2) Handshake state machine
*
* The Message flow state machine controls the reading and sending of messages
* including handling of non-blocking IO events, flushing of the underlying
* write BIO, handling unexpected messages, etc. It is itself broken into two
* separate sub-state machines which control reading and writing respectively.
*
* The Handshake state machine keeps track of the current SSL/TLS handshake
* state. Transitions of the handshake state are the result of events that
* occur within the Message flow state machine.
*
* Overall it looks like this:
*
* --------------------------------------------- -------------------
* | | | |
* | Message flow state machine | | |
* | | | |
* | -------------------- -------------------- | Transition | Handshake state |
* | | MSG_FLOW_READING | | MSG_FLOW_WRITING | | Event | machine |
* | | sub-state | | sub-state | |----------->| |
* | | machine for | | machine for | | | |
* | | reading messages | | writing messages | | | |
* | -------------------- -------------------- | | |
* | | | |
* --------------------------------------------- -------------------
*
*/
/* Sub state machine return values */
typedef enum {
/* Something bad happened or NBIO */
SUB_STATE_ERROR,
/* Sub state finished go to the next sub state */
SUB_STATE_FINISHED,
/* Sub state finished and handshake was completed */
SUB_STATE_END_HANDSHAKE
} SUB_STATE_RETURN;
static int state_machine(SSL *s, int server);
static void init_read_state_machine(SSL *s);
static SUB_STATE_RETURN read_state_machine(SSL *s);
static void init_write_state_machine(SSL *s);
static SUB_STATE_RETURN write_state_machine(SSL *s);
OSSL_HANDSHAKE_STATE SSL_get_state(const SSL *ssl)
{
return ssl->statem.hand_state;
}
int SSL_in_init(SSL *s)
{
return s->statem.in_init;
}
int SSL_is_init_finished(SSL *s)
{
return !(s->statem.in_init) && (s->statem.hand_state == TLS_ST_OK);
}
int SSL_in_before(SSL *s)
{
/*
* Historically being "in before" meant before anything had happened. In the
* current code though we remain in the "before" state for a while after we
* have started the handshake process (e.g. as a server waiting for the
* first message to arrive). There "in before" is taken to mean "in before"
* and not started any handshake process yet.
*/
return (s->statem.hand_state == TLS_ST_BEFORE)
&& (s->statem.state == MSG_FLOW_UNINITED);
}
/*
* Clear the state machine state and reset back to MSG_FLOW_UNINITED
*/
void ossl_statem_clear(SSL *s)
{
s->statem.state = MSG_FLOW_UNINITED;
s->statem.hand_state = TLS_ST_BEFORE;
s->statem.in_init = 1;
s->statem.no_cert_verify = 0;
}
/*
* Set the state machine up ready for a renegotiation handshake
*/
void ossl_statem_set_renegotiate(SSL *s)
{
s->statem.state = MSG_FLOW_RENEGOTIATE;
s->statem.in_init = 1;
}
/*
* Put the state machine into an error state. This is a permanent error for
* the current connection.
*/
void ossl_statem_set_error(SSL *s)
{
s->statem.state = MSG_FLOW_ERROR;
}
/*
* Discover whether the current connection is in the error state.
*
* Valid return values are:
* 1: Yes
* 0: No
*/
int ossl_statem_in_error(const SSL *s)
{
if (s->statem.state == MSG_FLOW_ERROR)
return 1;
return 0;
}
void ossl_statem_set_in_init(SSL *s, int init)
{
s->statem.in_init = init;
}
int ossl_statem_get_in_handshake(SSL *s)
{
return s->statem.in_handshake;
}
void ossl_statem_set_in_handshake(SSL *s, int inhand)
{
if (inhand)
s->statem.in_handshake++;
else
s->statem.in_handshake--;
}
void ossl_statem_set_hello_verify_done(SSL *s)
{
s->statem.state = MSG_FLOW_UNINITED;
s->statem.in_init = 1;
/*
* This will get reset (briefly) back to TLS_ST_BEFORE when we enter
* state_machine() because |state| is MSG_FLOW_UNINITED, but until then any
* calls to SSL_in_before() will return false. Also calls to
* SSL_state_string() and SSL_state_string_long() will return something
* sensible.
*/
s->statem.hand_state = TLS_ST_SR_CLNT_HELLO;
}
int ossl_statem_connect(SSL *s) {
return state_machine(s, 0);
}
int ossl_statem_accept(SSL *s)
{
return state_machine(s, 1);
}
static void (*get_callback(SSL *s))(const SSL *, int, int)
{
if (s->info_callback != NULL)
return s->info_callback;
else if (s->ctx->info_callback != NULL)
return s->ctx->info_callback;
return NULL;
}
/*
* The main message flow state machine. We start in the MSG_FLOW_UNINITED or
* MSG_FLOW_RENEGOTIATE state and finish in MSG_FLOW_FINISHED. Valid states and
* transitions are as follows:
*
* MSG_FLOW_UNINITED MSG_FLOW_RENEGOTIATE
* | |
* +-----------------------+
* v
* MSG_FLOW_WRITING <---> MSG_FLOW_READING
* |
* V
* MSG_FLOW_FINISHED
* |
* V
* [SUCCESS]
*
* We may exit at any point due to an error or NBIO event. If an NBIO event
* occurs then we restart at the point we left off when we are recalled.
* MSG_FLOW_WRITING and MSG_FLOW_READING have sub-state machines associated with them.
*
* In addition to the above there is also the MSG_FLOW_ERROR state. We can move
* into that state at any point in the event that an irrecoverable error occurs.
*
* Valid return values are:
* 1: Success
* <=0: NBIO or error
*/
static int state_machine(SSL *s, int server)
{
BUF_MEM *buf = NULL;
unsigned long Time = (unsigned long)time(NULL);
void (*cb) (const SSL *ssl, int type, int val) = NULL;
OSSL_STATEM *st = &s->statem;
int ret = -1;
int ssret;
if (st->state == MSG_FLOW_ERROR) {
/* Shouldn't have been called if we're already in the error state */
return -1;
}
RAND_add(&Time, sizeof(Time), 0);
ERR_clear_error();
clear_sys_error();
cb = get_callback(s);
st->in_handshake++;
if (!SSL_in_init(s) || SSL_in_before(s)) {
if (!SSL_clear(s))
return -1;
}
#ifndef OPENSSL_NO_SCTP
if (SSL_IS_DTLS(s)) {
/*
* Notify SCTP BIO socket to enter handshake mode and prevent stream
* identifier other than 0. Will be ignored if no SCTP is used.
*/
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
st->in_handshake, NULL);
}
#endif
#ifndef OPENSSL_NO_HEARTBEATS
/*
* If we're awaiting a HeartbeatResponse, pretend we already got and
* don't await it anymore, because Heartbeats don't make sense during
* handshakes anyway.
*/
if (s->tlsext_hb_pending) {
if (SSL_IS_DTLS(s))
dtls1_stop_timer(s);
s->tlsext_hb_pending = 0;
s->tlsext_hb_seq++;
}
#endif
/* Initialise state machine */
if (st->state == MSG_FLOW_RENEGOTIATE) {
s->renegotiate = 1;
if (!server)
s->ctx->stats.sess_connect_renegotiate++;
}
if (st->state == MSG_FLOW_UNINITED || st->state == MSG_FLOW_RENEGOTIATE) {
if (st->state == MSG_FLOW_UNINITED) {
st->hand_state = TLS_ST_BEFORE;
}
s->server = server;
if (cb != NULL)
cb(s, SSL_CB_HANDSHAKE_START, 1);
if (SSL_IS_DTLS(s)) {
if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
(server
|| (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00))) {
SSLerr(SSL_F_STATE_MACHINE, ERR_R_INTERNAL_ERROR);
goto end;
}
} else {
if ((s->version >> 8) != SSL3_VERSION_MAJOR) {
SSLerr(SSL_F_STATE_MACHINE, ERR_R_INTERNAL_ERROR);
goto end;
}
}
if (!ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL)) {
SSLerr(SSL_F_STATE_MACHINE, SSL_R_VERSION_TOO_LOW);
goto end;
}
if (s->init_buf == NULL) {
if ((buf = BUF_MEM_new()) == NULL) {
goto end;
}
if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
goto end;
}
s->init_buf = buf;
buf = NULL;
}
if (!ssl3_setup_buffers(s)) {
goto end;
}
s->init_num = 0;
/*
* Should have been reset by tls_process_finished, too.
*/
s->s3->change_cipher_spec = 0;
if (!server || st->state != MSG_FLOW_RENEGOTIATE) {
/*
* Ok, we now need to push on a buffering BIO ...but not with
* SCTP
*/
#ifndef OPENSSL_NO_SCTP
if (!SSL_IS_DTLS(s) || !BIO_dgram_is_sctp(SSL_get_wbio(s)))
#endif
if (!ssl_init_wbio_buffer(s, server ? 1 : 0)) {
goto end;
}
ssl3_init_finished_mac(s);
}
if (server) {
if (st->state != MSG_FLOW_RENEGOTIATE) {
s->ctx->stats.sess_accept++;
} else if (!s->s3->send_connection_binding &&
!(s->options &
SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
/*
* Server attempting to renegotiate with client that doesn't
* support secure renegotiation.
*/
SSLerr(SSL_F_STATE_MACHINE,
SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
ossl_statem_set_error(s);
goto end;
} else {
/*
* st->state == MSG_FLOW_RENEGOTIATE, we will just send a
* HelloRequest
*/
s->ctx->stats.sess_accept_renegotiate++;
}
} else {
s->ctx->stats.sess_connect++;
/* mark client_random uninitialized */
memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
s->hit = 0;
s->s3->tmp.cert_request = 0;
if (SSL_IS_DTLS(s)) {
st->use_timer = 1;
}
}
st->state = MSG_FLOW_WRITING;
init_write_state_machine(s);
st->read_state_first_init = 1;
}
while(st->state != MSG_FLOW_FINISHED) {
if(st->state == MSG_FLOW_READING) {
ssret = read_state_machine(s);
if (ssret == SUB_STATE_FINISHED) {
st->state = MSG_FLOW_WRITING;
init_write_state_machine(s);
} else {
/* NBIO or error */
goto end;
}
} else if (st->state == MSG_FLOW_WRITING) {
ssret = write_state_machine(s);
if (ssret == SUB_STATE_FINISHED) {
st->state = MSG_FLOW_READING;
init_read_state_machine(s);
} else if (ssret == SUB_STATE_END_HANDSHAKE) {
st->state = MSG_FLOW_FINISHED;
} else {
/* NBIO or error */
goto end;
}
} else {
/* Error */
ossl_statem_set_error(s);
goto end;
}
}
st->state = MSG_FLOW_UNINITED;
ret = 1;
end:
st->in_handshake--;
#ifndef OPENSSL_NO_SCTP
if (SSL_IS_DTLS(s)) {
/*
* Notify SCTP BIO socket to leave handshake mode and allow stream
* identifier other than 0. Will be ignored if no SCTP is used.
*/
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
st->in_handshake, NULL);
}
#endif
BUF_MEM_free(buf);
if (cb != NULL) {
if (server)
cb(s, SSL_CB_ACCEPT_EXIT, ret);
else
cb(s, SSL_CB_CONNECT_EXIT, ret);
}
return ret;
}
/*
* Initialise the MSG_FLOW_READING sub-state machine
*/
static void init_read_state_machine(SSL *s)
{
OSSL_STATEM *st = &s->statem;
st->read_state = READ_STATE_HEADER;
}
/*
* This function implements the sub-state machine when the message flow is in
* MSG_FLOW_READING. The valid sub-states and transitions are:
*
* READ_STATE_HEADER <--+<-------------+
* | | |
* v | |
* READ_STATE_BODY -----+-->READ_STATE_POST_PROCESS
* | |
* +----------------------------+
* v
* [SUB_STATE_FINISHED]
*
* READ_STATE_HEADER has the responsibility for reading in the message header
* and transitioning the state of the handshake state machine.
*
* READ_STATE_BODY reads in the rest of the message and then subsequently
* processes it.
*
* READ_STATE_POST_PROCESS is an optional step that may occur if some post
* processing activity performed on the message may block.
*
* Any of the above states could result in an NBIO event occuring in which case
* control returns to the calling application. When this function is recalled we
* will resume in the same state where we left off.
*/
static SUB_STATE_RETURN read_state_machine(SSL *s) {
OSSL_STATEM *st = &s->statem;
int ret, mt;
unsigned long len = 0;
int (*transition)(SSL *s, int mt);
PACKET pkt;
MSG_PROCESS_RETURN (*process_message)(SSL *s, PACKET *pkt);
WORK_STATE (*post_process_message)(SSL *s, WORK_STATE wst);
unsigned long (*max_message_size)(SSL *s);
void (*cb) (const SSL *ssl, int type, int val) = NULL;
cb = get_callback(s);
if(s->server) {
transition = ossl_statem_server_read_transition;
process_message = ossl_statem_server_process_message;
max_message_size = ossl_statem_server_max_message_size;
post_process_message = ossl_statem_server_post_process_message;
} else {
transition = ossl_statem_client_read_transition;
process_message = ossl_statem_client_process_message;
max_message_size = ossl_statem_client_max_message_size;
post_process_message = ossl_statem_client_post_process_message;
}
if (st->read_state_first_init) {
s->first_packet = 1;
st->read_state_first_init = 0;
}
while(1) {
switch(st->read_state) {
case READ_STATE_HEADER:
s->init_num = 0;
/* Get the state the peer wants to move to */
if (SSL_IS_DTLS(s)) {
/*
* In DTLS we get the whole message in one go - header and body
*/
ret = dtls_get_message(s, &mt, &len);
} else {
ret = tls_get_message_header(s, &mt);
}
if (ret == 0) {
/* Could be non-blocking IO */
return SUB_STATE_ERROR;
}
if (cb != NULL) {
/* Notify callback of an impending state change */
if (s->server)
cb(s, SSL_CB_ACCEPT_LOOP, 1);
else
cb(s, SSL_CB_CONNECT_LOOP, 1);
}
/*
* Validate that we are allowed to move to the new state and move
* to that state if so
*/
if(!transition(s, mt)) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE);
SSLerr(SSL_F_READ_STATE_MACHINE, SSL_R_UNEXPECTED_MESSAGE);
return SUB_STATE_ERROR;
}
if (s->s3->tmp.message_size > max_message_size(s)) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
SSLerr(SSL_F_READ_STATE_MACHINE, SSL_R_EXCESSIVE_MESSAGE_SIZE);
return SUB_STATE_ERROR;
}
st->read_state = READ_STATE_BODY;
/* Fall through */
case READ_STATE_BODY:
if (!SSL_IS_DTLS(s)) {
/* We already got this above for DTLS */
ret = tls_get_message_body(s, &len);
if (ret == 0) {
/* Could be non-blocking IO */
return SUB_STATE_ERROR;
}
}
s->first_packet = 0;
if (!PACKET_buf_init(&pkt, s->init_msg, len)) {
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
SSLerr(SSL_F_READ_STATE_MACHINE, ERR_R_INTERNAL_ERROR);
return SUB_STATE_ERROR;
}
ret = process_message(s, &pkt);
if (ret == MSG_PROCESS_ERROR) {
return SUB_STATE_ERROR;
}
if (ret == MSG_PROCESS_FINISHED_READING) {
if (SSL_IS_DTLS(s)) {
dtls1_stop_timer(s);
}
return SUB_STATE_FINISHED;
}
if (ret == MSG_PROCESS_CONTINUE_PROCESSING) {
st->read_state = READ_STATE_POST_PROCESS;
st->read_state_work = WORK_MORE_A;
} else {
st->read_state = READ_STATE_HEADER;
}
break;
case READ_STATE_POST_PROCESS:
st->read_state_work = post_process_message(s, st->read_state_work);
switch(st->read_state_work) {
default:
return SUB_STATE_ERROR;
case WORK_FINISHED_CONTINUE:
st->read_state = READ_STATE_HEADER;
break;
case WORK_FINISHED_STOP:
if (SSL_IS_DTLS(s)) {
dtls1_stop_timer(s);
}
return SUB_STATE_FINISHED;
}
break;
default:
/* Shouldn't happen */
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
SSLerr(SSL_F_READ_STATE_MACHINE, ERR_R_INTERNAL_ERROR);
ossl_statem_set_error(s);
return SUB_STATE_ERROR;
}
}
}
/*
* Send a previously constructed message to the peer.
*/
static int statem_do_write(SSL *s)
{
OSSL_STATEM *st = &s->statem;
if (st->hand_state == TLS_ST_CW_CHANGE
|| st->hand_state == TLS_ST_SW_CHANGE) {
if (SSL_IS_DTLS(s))
return dtls1_do_write(s, SSL3_RT_CHANGE_CIPHER_SPEC);
else
return ssl3_do_write(s, SSL3_RT_CHANGE_CIPHER_SPEC);
} else {
return ssl_do_write(s);
}
}
/*
* Initialise the MSG_FLOW_WRITING sub-state machine
*/
static void init_write_state_machine(SSL *s)
{
OSSL_STATEM *st = &s->statem;
st->write_state = WRITE_STATE_TRANSITION;
}
/*
* This function implements the sub-state machine when the message flow is in
* MSG_FLOW_WRITING. The valid sub-states and transitions are:
*
* +-> WRITE_STATE_TRANSITION ------> [SUB_STATE_FINISHED]
* | |
* | v
* | WRITE_STATE_PRE_WORK -----> [SUB_STATE_END_HANDSHAKE]
* | |
* | v
* | WRITE_STATE_SEND
* | |
* | v
* | WRITE_STATE_POST_WORK
* | |
* +-------------+
*
* WRITE_STATE_TRANSITION transitions the state of the handshake state machine
* WRITE_STATE_PRE_WORK performs any work necessary to prepare the later
* sending of the message. This could result in an NBIO event occuring in
* which case control returns to the calling application. When this function
* is recalled we will resume in the same state where we left off.
*
* WRITE_STATE_SEND sends the message and performs any work to be done after
* sending.
*
* WRITE_STATE_POST_WORK performs any work necessary after the sending of the
* message has been completed. As for WRITE_STATE_PRE_WORK this could also
* result in an NBIO event.
*/
static SUB_STATE_RETURN write_state_machine(SSL *s)
{
OSSL_STATEM *st = &s->statem;
int ret;
WRITE_TRAN (*transition)(SSL *s);
WORK_STATE (*pre_work)(SSL *s, WORK_STATE wst);
WORK_STATE (*post_work)(SSL *s, WORK_STATE wst);
int (*construct_message)(SSL *s);
void (*cb) (const SSL *ssl, int type, int val) = NULL;
cb = get_callback(s);
if(s->server) {
transition = ossl_statem_server_write_transition;
pre_work = ossl_statem_server_pre_work;
post_work = ossl_statem_server_post_work;
construct_message = ossl_statem_server_construct_message;
} else {
transition = ossl_statem_client_write_transition;
pre_work = ossl_statem_client_pre_work;
post_work = ossl_statem_client_post_work;
construct_message = ossl_statem_client_construct_message;
}
while(1) {
switch(st->write_state) {
case WRITE_STATE_TRANSITION:
if (cb != NULL) {
/* Notify callback of an impending state change */
if (s->server)
cb(s, SSL_CB_ACCEPT_LOOP, 1);
else
cb(s, SSL_CB_CONNECT_LOOP, 1);
}
switch(transition(s)) {
case WRITE_TRAN_CONTINUE:
st->write_state = WRITE_STATE_PRE_WORK;
st->write_state_work = WORK_MORE_A;
break;
case WRITE_TRAN_FINISHED:
return SUB_STATE_FINISHED;
break;
default:
return SUB_STATE_ERROR;
}
break;
case WRITE_STATE_PRE_WORK:
switch(st->write_state_work = pre_work(s, st->write_state_work)) {
default:
return SUB_STATE_ERROR;
case WORK_FINISHED_CONTINUE:
st->write_state = WRITE_STATE_SEND;
break;
case WORK_FINISHED_STOP:
return SUB_STATE_END_HANDSHAKE;
}
if(construct_message(s) == 0)
return SUB_STATE_ERROR;
/* Fall through */
case WRITE_STATE_SEND:
if (SSL_IS_DTLS(s) && st->use_timer) {
dtls1_start_timer(s);
}
ret = statem_do_write(s);
if (ret <= 0) {
return SUB_STATE_ERROR;
}
st->write_state = WRITE_STATE_POST_WORK;
st->write_state_work = WORK_MORE_A;
/* Fall through */
case WRITE_STATE_POST_WORK:
switch(st->write_state_work = post_work(s, st->write_state_work)) {
default:
return SUB_STATE_ERROR;
case WORK_FINISHED_CONTINUE:
st->write_state = WRITE_STATE_TRANSITION;
break;
case WORK_FINISHED_STOP:
return SUB_STATE_END_HANDSHAKE;
}
break;
default:
return SUB_STATE_ERROR;
}
}
}
/*
* Flush the write BIO
*/
int statem_flush(SSL *s)
{
s->rwstate = SSL_WRITING;
if (BIO_flush(s->wbio) <= 0) {
return 0;
}
s->rwstate = SSL_NOTHING;
return 1;
}
/*
* Called by the record layer to determine whether application data is
* allowed to be sent in the current handshake state or not.
*
* Return values are:
* 1: Yes (application data allowed)
* 0: No (application data not allowed)
*/
int ossl_statem_app_data_allowed(SSL *s)
{
OSSL_STATEM *st = &s->statem;
if (st->state == MSG_FLOW_UNINITED || st->state == MSG_FLOW_RENEGOTIATE)
return 0;
if (!s->s3->in_read_app_data || (s->s3->total_renegotiations == 0))
return 0;
if (s->server) {
/*
* If we're a server and we haven't got as far as writing our
* ServerHello yet then we allow app data
*/
if (st->hand_state == TLS_ST_BEFORE
|| st->hand_state == TLS_ST_SR_CLNT_HELLO)
return 1;
} else {
/*
* If we're a client and we haven't read the ServerHello yet then we
* allow app data
*/
if (st->hand_state == TLS_ST_CW_CLNT_HELLO)
return 1;
}
return 0;
}
#ifndef OPENSSL_NO_SCTP
/*
* Set flag used by SCTP to determine whether we are in the read sock state
*/
void ossl_statem_set_sctp_read_sock(SSL *s, int read_sock)
{
s->statem.in_sctp_read_sock = read_sock;
}
/*
* Called by the record layer to determine whether we are in the read sock
* state or not.
*
* Return values are:
* 1: Yes (we are in the read sock state)
* 0: No (we are not in the read sock state)
*/
int ossl_statem_in_sctp_read_sock(SSL *s)
{
return s->statem.in_sctp_read_sock;
}
#endif
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