int ssl23_connect(SSL *s)
{
BUF_MEM *buf = NULL;
void (*cb)(const SSL *ssl, int type, int val) = NULL;
int ret = -1;
int new_state, state;
ERR_clear_error();
errno = 0;
if (s->info_callback != NULL)
cb = s->info_callback;
else if (s->ctx->info_callback != NULL)
cb = s->ctx->info_callback;
s->in_handshake++;
if (!SSL_in_init(s) || SSL_in_before(s))
SSL_clear(s);
for (;;) {
state = s->state;
switch (s->state) {
case SSL_ST_BEFORE:
case SSL_ST_CONNECT:
case SSL_ST_BEFORE | SSL_ST_CONNECT:
case SSL_ST_OK | SSL_ST_CONNECT:
if (s->session != NULL) {
SSLerr(SSL_F_SSL23_CONNECT, SSL_R_SSL23_DOING_SESSION_ID_REUSE);
ret = -1;
goto end;
}
s->server = 0;
if (cb != NULL)
cb(s, SSL_CB_HANDSHAKE_START, 1);
/* s->version=TLS1_VERSION; */
s->type = SSL_ST_CONNECT;
if (s->init_buf == NULL) {
if ((buf = BUF_MEM_new()) == NULL) {
ret = -1;
goto end;
}
if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
ret = -1;
goto end;
}
s->init_buf = buf;
buf = NULL;
}
if (!ssl3_setup_buffers(s)) {
ret = -1;
goto end;
}
tls1_init_finished_mac(s);
s->state = SSL23_ST_CW_CLNT_HELLO_A;
s->ctx->stats.sess_connect++;
s->init_num = 0;
break;
case SSL23_ST_CW_CLNT_HELLO_A:
case SSL23_ST_CW_CLNT_HELLO_B:
s->shutdown = 0;
ret = ssl23_client_hello(s);
if (ret <= 0)
goto end;
s->state = SSL23_ST_CR_SRVR_HELLO_A;
s->init_num = 0;
break;
case SSL23_ST_CR_SRVR_HELLO_A:
case SSL23_ST_CR_SRVR_HELLO_B:
ret = ssl23_get_server_hello(s);
if (ret >= 0)
cb = NULL;
goto end;
/* break; */
default:
SSLerr(SSL_F_SSL23_CONNECT, SSL_R_UNKNOWN_STATE);
ret = -1;
goto end;
/* break; */
}
if (s->debug) {
(void)BIO_flush(s->wbio);
}
if ((cb != NULL) && (s->state != state)) {
new_state = s->state;
s->state = state;
cb(s, SSL_CB_CONNECT_LOOP, 1);
s->state = new_state;
}
}
end:
s->in_handshake--;
BUF_MEM_free(buf);
if (cb != NULL)
cb(s, SSL_CB_CONNECT_EXIT, ret);
return (ret);
}
int
dtls1_connect(SSL *s)
{
void (*cb)(const SSL *ssl, int type, int val) = NULL;
int ret = -1;
int new_state, state, skip = 0;
ERR_clear_error();
errno = 0;
if (s->internal->info_callback != NULL)
cb = s->internal->info_callback;
else if (s->ctx->internal->info_callback != NULL)
cb = s->ctx->internal->info_callback;
s->internal->in_handshake++;
if (!SSL_in_init(s) || SSL_in_before(s))
SSL_clear(s);
for (;;) {
state = S3I(s)->hs.state;
switch (S3I(s)->hs.state) {
case SSL_ST_RENEGOTIATE:
s->internal->renegotiate = 1;
S3I(s)->hs.state = SSL_ST_CONNECT;
s->ctx->internal->stats.sess_connect_renegotiate++;
/* break */
case SSL_ST_BEFORE:
case SSL_ST_CONNECT:
case SSL_ST_BEFORE|SSL_ST_CONNECT:
case SSL_ST_OK|SSL_ST_CONNECT:
s->server = 0;
if (cb != NULL)
cb(s, SSL_CB_HANDSHAKE_START, 1);
if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00)) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
ret = -1;
goto end;
}
/* s->version=SSL3_VERSION; */
s->internal->type = SSL_ST_CONNECT;
if (!ssl3_setup_init_buffer(s)) {
ret = -1;
goto end;
}
if (!ssl3_setup_buffers(s)) {
ret = -1;
goto end;
}
if (!ssl_init_wbio_buffer(s, 0)) {
ret = -1;
goto end;
}
/* don't push the buffering BIO quite yet */
S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A;
s->ctx->internal->stats.sess_connect++;
s->internal->init_num = 0;
/* mark client_random uninitialized */
memset(s->s3->client_random, 0,
sizeof(s->s3->client_random));
D1I(s)->send_cookie = 0;
s->internal->hit = 0;
break;
case SSL3_ST_CW_CLNT_HELLO_A:
case SSL3_ST_CW_CLNT_HELLO_B:
s->internal->shutdown = 0;
/* every DTLS ClientHello resets Finished MAC */
if (!tls1_init_finished_mac(s)) {
ret = -1;
goto end;
}
dtls1_start_timer(s);
ret = ssl3_client_hello(s);
if (ret <= 0)
goto end;
if (D1I(s)->send_cookie) {
S3I(s)->hs.state = SSL3_ST_CW_FLUSH;
S3I(s)->hs.next_state = SSL3_ST_CR_SRVR_HELLO_A;
} else
S3I(s)->hs.state = SSL3_ST_CR_SRVR_HELLO_A;
s->internal->init_num = 0;
/* turn on buffering for the next lot of output */
if (s->bbio != s->wbio)
s->wbio = BIO_push(s->bbio, s->wbio);
break;
case SSL3_ST_CR_SRVR_HELLO_A:
case SSL3_ST_CR_SRVR_HELLO_B:
ret = ssl3_get_server_hello(s);
if (ret <= 0)
goto end;
else {
if (s->internal->hit) {
S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A;
} else
S3I(s)->hs.state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
}
s->internal->init_num = 0;
break;
case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
ret = dtls1_get_hello_verify(s);
if (ret <= 0)
goto end;
dtls1_stop_timer(s);
if ( D1I(s)->send_cookie) /* start again, with a cookie */
S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A;
else
S3I(s)->hs.state = SSL3_ST_CR_CERT_A;
s->internal->init_num = 0;
break;
case SSL3_ST_CR_CERT_A:
case SSL3_ST_CR_CERT_B:
ret = ssl3_check_finished(s);
if (ret <= 0)
goto end;
if (ret == 2) {
s->internal->hit = 1;
if (s->internal->tlsext_ticket_expected)
S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A;
else
S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A;
s->internal->init_num = 0;
break;
}
/* Check if it is anon DH. */
if (!(S3I(s)->hs.new_cipher->algorithm_auth &
SSL_aNULL)) {
ret = ssl3_get_server_certificate(s);
if (ret <= 0)
goto end;
if (s->internal->tlsext_status_expected)
S3I(s)->hs.state = SSL3_ST_CR_CERT_STATUS_A;
else
S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A;
} else {
skip = 1;
S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A;
}
s->internal->init_num = 0;
break;
case SSL3_ST_CR_KEY_EXCH_A:
case SSL3_ST_CR_KEY_EXCH_B:
ret = ssl3_get_server_key_exchange(s);
if (ret <= 0)
goto end;
S3I(s)->hs.state = SSL3_ST_CR_CERT_REQ_A;
s->internal->init_num = 0;
/* at this point we check that we have the
* required stuff from the server */
if (!ssl3_check_cert_and_algorithm(s)) {
ret = -1;
goto end;
}
break;
case SSL3_ST_CR_CERT_REQ_A:
case SSL3_ST_CR_CERT_REQ_B:
ret = ssl3_get_certificate_request(s);
if (ret <= 0)
goto end;
S3I(s)->hs.state = SSL3_ST_CR_SRVR_DONE_A;
s->internal->init_num = 0;
break;
case SSL3_ST_CR_SRVR_DONE_A:
case SSL3_ST_CR_SRVR_DONE_B:
ret = ssl3_get_server_done(s);
if (ret <= 0)
goto end;
dtls1_stop_timer(s);
if (S3I(s)->tmp.cert_req)
S3I(s)->hs.next_state = SSL3_ST_CW_CERT_A;
else
S3I(s)->hs.next_state = SSL3_ST_CW_KEY_EXCH_A;
s->internal->init_num = 0;
S3I(s)->hs.state = S3I(s)->hs.next_state;
break;
case SSL3_ST_CW_CERT_A:
case SSL3_ST_CW_CERT_B:
case SSL3_ST_CW_CERT_C:
case SSL3_ST_CW_CERT_D:
dtls1_start_timer(s);
ret = ssl3_send_client_certificate(s);
if (ret <= 0)
goto end;
S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A;
s->internal->init_num = 0;
break;
case SSL3_ST_CW_KEY_EXCH_A:
case SSL3_ST_CW_KEY_EXCH_B:
dtls1_start_timer(s);
ret = ssl3_send_client_key_exchange(s);
if (ret <= 0)
goto end;
/* EAY EAY EAY need to check for DH fix cert
* sent back */
/* For TLS, cert_req is set to 2, so a cert chain
* of nothing is sent, but no verify packet is sent */
if (S3I(s)->tmp.cert_req == 1) {
S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_A;
} else {
S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A;
S3I(s)->change_cipher_spec = 0;
}
s->internal->init_num = 0;
break;
case SSL3_ST_CW_CERT_VRFY_A:
case SSL3_ST_CW_CERT_VRFY_B:
dtls1_start_timer(s);
ret = ssl3_send_client_verify(s);
if (ret <= 0)
goto end;
S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A;
s->internal->init_num = 0;
S3I(s)->change_cipher_spec = 0;
break;
case SSL3_ST_CW_CHANGE_A:
case SSL3_ST_CW_CHANGE_B:
if (!s->internal->hit)
dtls1_start_timer(s);
ret = dtls1_send_change_cipher_spec(s,
SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B);
if (ret <= 0)
goto end;
S3I(s)->hs.state = SSL3_ST_CW_FINISHED_A;
s->internal->init_num = 0;
s->session->cipher = S3I(s)->hs.new_cipher;
if (!tls1_setup_key_block(s)) {
ret = -1;
goto end;
}
if (!tls1_change_cipher_state(s,
SSL3_CHANGE_CIPHER_CLIENT_WRITE)) {
ret = -1;
goto end;
}
dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
break;
case SSL3_ST_CW_FINISHED_A:
case SSL3_ST_CW_FINISHED_B:
if (!s->internal->hit)
dtls1_start_timer(s);
ret = ssl3_send_finished(s,
SSL3_ST_CW_FINISHED_A, SSL3_ST_CW_FINISHED_B,
TLS_MD_CLIENT_FINISH_CONST,
TLS_MD_CLIENT_FINISH_CONST_SIZE);
if (ret <= 0)
goto end;
S3I(s)->hs.state = SSL3_ST_CW_FLUSH;
/* clear flags */
s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
if (s->internal->hit) {
S3I(s)->hs.next_state = SSL_ST_OK;
if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
S3I(s)->hs.state = SSL_ST_OK;
s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
S3I(s)->delay_buf_pop_ret = 0;
}
} else {
/* Allow NewSessionTicket if ticket expected */
if (s->internal->tlsext_ticket_expected)
S3I(s)->hs.next_state =
SSL3_ST_CR_SESSION_TICKET_A;
else
S3I(s)->hs.next_state =
SSL3_ST_CR_FINISHED_A;
}
s->internal->init_num = 0;
break;
case SSL3_ST_CR_SESSION_TICKET_A:
case SSL3_ST_CR_SESSION_TICKET_B:
ret = ssl3_get_new_session_ticket(s);
if (ret <= 0)
goto end;
S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A;
s->internal->init_num = 0;
break;
case SSL3_ST_CR_CERT_STATUS_A:
case SSL3_ST_CR_CERT_STATUS_B:
ret = ssl3_get_cert_status(s);
if (ret <= 0)
goto end;
S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A;
s->internal->init_num = 0;
break;
case SSL3_ST_CR_FINISHED_A:
case SSL3_ST_CR_FINISHED_B:
D1I(s)->change_cipher_spec_ok = 1;
ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
SSL3_ST_CR_FINISHED_B);
if (ret <= 0)
goto end;
dtls1_stop_timer(s);
if (s->internal->hit)
S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A;
else
S3I(s)->hs.state = SSL_ST_OK;
s->internal->init_num = 0;
break;
case SSL3_ST_CW_FLUSH:
s->internal->rwstate = SSL_WRITING;
if (BIO_flush(s->wbio) <= 0) {
/* If the write error was fatal, stop trying */
if (!BIO_should_retry(s->wbio)) {
s->internal->rwstate = SSL_NOTHING;
S3I(s)->hs.state = S3I(s)->hs.next_state;
}
ret = -1;
goto end;
}
s->internal->rwstate = SSL_NOTHING;
S3I(s)->hs.state = S3I(s)->hs.next_state;
break;
case SSL_ST_OK:
/* clean a few things up */
tls1_cleanup_key_block(s);
/* If we are not 'joining' the last two packets,
* remove the buffering now */
if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
ssl_free_wbio_buffer(s);
/* else do it later in ssl3_write */
s->internal->init_num = 0;
s->internal->renegotiate = 0;
s->internal->new_session = 0;
ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
if (s->internal->hit)
s->ctx->internal->stats.sess_hit++;
ret = 1;
/* s->server=0; */
s->internal->handshake_func = dtls1_connect;
s->ctx->internal->stats.sess_connect_good++;
if (cb != NULL)
cb(s, SSL_CB_HANDSHAKE_DONE, 1);
/* done with handshaking */
D1I(s)->handshake_read_seq = 0;
D1I(s)->next_handshake_write_seq = 0;
goto end;
/* break; */
default:
SSLerror(s, SSL_R_UNKNOWN_STATE);
ret = -1;
goto end;
/* break; */
}
/* did we do anything */
if (!S3I(s)->tmp.reuse_message && !skip) {
if (s->internal->debug) {
if ((ret = BIO_flush(s->wbio)) <= 0)
goto end;
}
if ((cb != NULL) && (S3I(s)->hs.state != state)) {
new_state = S3I(s)->hs.state;
S3I(s)->hs.state = state;
cb(s, SSL_CB_CONNECT_LOOP, 1);
S3I(s)->hs.state = new_state;
}
}
skip = 0;
}
end:
s->internal->in_handshake--;
if (cb != NULL)
cb(s, SSL_CB_CONNECT_EXIT, ret);
return (ret);
}
int dtls1_accept(SSL *s)
{
void (*cb)(const SSL *ssl, int type, int val) = NULL;
unsigned long alg_k;
int ret = -1;
int new_state, state, skip = 0;
int listen;
ERR_clear_error();
errno = 0;
if (s->info_callback != NULL)
cb = s->info_callback;
else if (s->ctx->info_callback != NULL)
cb = s->ctx->info_callback;
listen = s->d1->listen;
/* init things to blank */
s->in_handshake++;
if (!SSL_in_init(s) || SSL_in_before(s))
SSL_clear(s);
s->d1->listen = listen;
if (s->cert == NULL) {
SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET);
return (-1);
}
for (;;) {
state = s->state;
switch (s->state) {
case SSL_ST_RENEGOTIATE:
s->renegotiate = 1;
/* s->state=SSL_ST_ACCEPT; */
case SSL_ST_BEFORE:
case SSL_ST_ACCEPT:
case SSL_ST_BEFORE | SSL_ST_ACCEPT:
case SSL_ST_OK | SSL_ST_ACCEPT:
s->server = 1;
if (cb != NULL)
cb(s, SSL_CB_HANDSHAKE_START, 1);
if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
return -1;
}
s->type = SSL_ST_ACCEPT;
if (s->init_buf == NULL) {
BUF_MEM *buf;
if ((buf = BUF_MEM_new()) == NULL) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
BUF_MEM_free(buf);
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
s->init_buf = buf;
}
if (!ssl3_setup_buffers(s)) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
s->init_num = 0;
s->d1->change_cipher_spec_ok = 0;
/* Should have been reset by ssl3_get_finished, too. */
s->s3->change_cipher_spec = 0;
if (s->state != SSL_ST_RENEGOTIATE) {
/*
* Ok, we now need to push on a buffering BIO so that
* the output is sent in a way that TCP likes :-)
* ...but not with SCTP :-)
*/
if (!ssl_init_wbio_buffer(s, 1)) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
tls1_init_finished_mac(s);
s->state = SSL3_ST_SR_CLNT_HELLO_A;
s->ctx->stats.sess_accept++;
} else if (!s->s3->send_connection_binding) {
/*
* Server attempting to renegotiate with client that doesn't
* support secure renegotiation.
*/
SSLerr(SSL_F_DTLS1_ACCEPT,
SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
ret = -1;
s->state = SSL_ST_ERR;
goto end;
} else {
/* s->state == SSL_ST_RENEGOTIATE,
* we will just send a HelloRequest */
s->ctx->stats.sess_accept_renegotiate++;
s->state = SSL3_ST_SW_HELLO_REQ_A;
}
break;
case SSL3_ST_SW_HELLO_REQ_A:
case SSL3_ST_SW_HELLO_REQ_B:
s->shutdown = 0;
dtls1_clear_sent_buffer(s);
dtls1_start_timer(s);
ret = ssl3_send_hello_request(s);
if (ret <= 0)
goto end;
s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
s->state = SSL3_ST_SW_FLUSH;
s->init_num = 0;
tls1_init_finished_mac(s);
break;
case SSL3_ST_SW_HELLO_REQ_C:
s->state = SSL_ST_OK;
break;
case SSL3_ST_SR_CLNT_HELLO_A:
case SSL3_ST_SR_CLNT_HELLO_B:
case SSL3_ST_SR_CLNT_HELLO_C:
s->shutdown = 0;
ret = ssl3_get_client_hello(s);
if (ret <= 0)
goto end;
dtls1_stop_timer(s);
if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
else
s->state = SSL3_ST_SW_SRVR_HELLO_A;
s->init_num = 0;
/* Reflect ClientHello sequence to remain stateless while listening */
if (listen) {
memcpy(s->s3->write_sequence, s->s3->read_sequence,
sizeof(s->s3->write_sequence));
}
/* If we're just listening, stop here */
if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) {
ret = 2;
s->d1->listen = 0;
/*
* Set expected sequence numbers
* to continue the handshake.
*/
s->d1->handshake_read_seq = 2;
s->d1->handshake_write_seq = 1;
s->d1->next_handshake_write_seq = 1;
goto end;
}
break;
case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
ret = dtls1_send_hello_verify_request(s);
if (ret <= 0)
goto end;
s->state = SSL3_ST_SW_FLUSH;
s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
/* HelloVerifyRequest resets Finished MAC */
tls1_init_finished_mac(s);
break;
case SSL3_ST_SW_SRVR_HELLO_A:
case SSL3_ST_SW_SRVR_HELLO_B:
s->renegotiate = 2;
dtls1_start_timer(s);
ret = ssl3_send_server_hello(s);
if (ret <= 0)
goto end;
if (s->hit) {
if (s->tlsext_ticket_expected)
s->state = SSL3_ST_SW_SESSION_TICKET_A;
else
s->state = SSL3_ST_SW_CHANGE_A;
} else
s->state = SSL3_ST_SW_CERT_A;
s->init_num = 0;
break;
case SSL3_ST_SW_CERT_A:
case SSL3_ST_SW_CERT_B:
/* Check if it is anon DH. */
if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)) {
dtls1_start_timer(s);
ret = ssl3_send_server_certificate(s);
if (ret <= 0)
goto end;
if (s->tlsext_status_expected)
s->state = SSL3_ST_SW_CERT_STATUS_A;
else
s->state = SSL3_ST_SW_KEY_EXCH_A;
} else {
skip = 1;
s->state = SSL3_ST_SW_KEY_EXCH_A;
}
s->init_num = 0;
break;
case SSL3_ST_SW_KEY_EXCH_A:
case SSL3_ST_SW_KEY_EXCH_B:
alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
/* only send if a DH key exchange */
if (alg_k & (SSL_kDHE | SSL_kECDHE)) {
dtls1_start_timer(s);
ret = ssl3_send_server_key_exchange(s);
if (ret <= 0)
goto end;
} else
skip = 1;
s->state = SSL3_ST_SW_CERT_REQ_A;
s->init_num = 0;
break;
case SSL3_ST_SW_CERT_REQ_A:
case SSL3_ST_SW_CERT_REQ_B:
/*
* Determine whether or not we need to request a
* certificate.
*
* Do not request a certificate if:
*
* - We did not ask for it (SSL_VERIFY_PEER is unset).
*
* - SSL_VERIFY_CLIENT_ONCE is set and we are
* renegotiating.
*
* - We are using an anonymous ciphersuites
* (see section "Certificate request" in SSL 3 drafts
* and in RFC 2246) ... except when the application
* insists on verification (against the specs, but
* s3_clnt.c accepts this for SSL 3).
*/
if (!(s->verify_mode & SSL_VERIFY_PEER) ||
((s->session->peer != NULL) &&
(s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
!(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)))
{
/* no cert request */
skip = 1;
s->s3->tmp.cert_request = 0;
s->state = SSL3_ST_SW_SRVR_DONE_A;
} else {
s->s3->tmp.cert_request = 1;
dtls1_start_timer(s);
ret = ssl3_send_certificate_request(s);
if (ret <= 0)
goto end;
s->state = SSL3_ST_SW_SRVR_DONE_A;
s->init_num = 0;
}
break;
case SSL3_ST_SW_SRVR_DONE_A:
case SSL3_ST_SW_SRVR_DONE_B:
dtls1_start_timer(s);
ret = ssl3_send_server_done(s);
if (ret <= 0)
goto end;
s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
s->state = SSL3_ST_SW_FLUSH;
s->init_num = 0;
break;
case SSL3_ST_SW_FLUSH:
s->rwstate = SSL_WRITING;
if (BIO_flush(s->wbio) <= 0) {
/* If the write error was fatal, stop trying */
if (!BIO_should_retry(s->wbio)) {
s->rwstate = SSL_NOTHING;
s->state = s->s3->tmp.next_state;
}
ret = -1;
goto end;
}
s->rwstate = SSL_NOTHING;
s->state = s->s3->tmp.next_state;
break;
case SSL3_ST_SR_CERT_A:
case SSL3_ST_SR_CERT_B:
if (s->s3->tmp.cert_request) {
ret = ssl3_get_client_certificate(s);
if (ret <= 0)
goto end;
}
s->init_num = 0;
s->state = SSL3_ST_SR_KEY_EXCH_A;
break;
case SSL3_ST_SR_KEY_EXCH_A:
case SSL3_ST_SR_KEY_EXCH_B:
ret = ssl3_get_client_key_exchange(s);
if (ret <= 0)
goto end;
s->state = SSL3_ST_SR_CERT_VRFY_A;
s->init_num = 0;
if (ret == 2) {
/* For the ECDH ciphersuites when
* the client sends its ECDH pub key in
* a certificate, the CertificateVerify
* message is not sent.
*/
s->state = SSL3_ST_SR_FINISHED_A;
s->init_num = 0;
} else if (SSL_USE_SIGALGS(s)) {
s->state = SSL3_ST_SR_CERT_VRFY_A;
s->init_num = 0;
if (!s->session->peer)
break;
/*
* For sigalgs freeze the handshake buffer
* at this point and digest cached records.
*/
if (!s->s3->handshake_buffer) {
SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
s->state = SSL_ST_ERR;
return -1;
}
s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
if (!tls1_digest_cached_records(s)) {
s->state = SSL_ST_ERR;
return -1;
}
} else {
s->state = SSL3_ST_SR_CERT_VRFY_A;
s->init_num = 0;
/* We need to get hashes here so if there is
* a client cert, it can be verified */
s->method->ssl3_enc->cert_verify_mac(s, NID_md5,
&(s->s3->tmp.cert_verify_md[0]));
s->method->ssl3_enc->cert_verify_mac(
s, NID_sha1, &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
}
break;
case SSL3_ST_SR_CERT_VRFY_A:
case SSL3_ST_SR_CERT_VRFY_B:
ret = ssl3_get_cert_verify(s);
if (ret <= 0)
goto end;
s->state = SSL3_ST_SR_FINISHED_A;
s->init_num = 0;
break;
case SSL3_ST_SR_FINISHED_A:
case SSL3_ST_SR_FINISHED_B:
/*
* Enable CCS. Receiving a CCS clears the flag, so make
* sure not to re-enable it to ban duplicates. This *should* be the
* first time we have received one - but we check anyway to be
* cautious.
* s->s3->change_cipher_spec is set when a CCS is
* processed in d1_pkt.c, and remains set until
* the client's Finished message is read.
*/
if (!s->s3->change_cipher_spec)
s->d1->change_cipher_spec_ok = 1;
ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A, SSL3_ST_SR_FINISHED_B);
if (ret <= 0)
goto end;
dtls1_stop_timer(s);
if (s->hit)
s->state = SSL_ST_OK;
else if (s->tlsext_ticket_expected)
s->state = SSL3_ST_SW_SESSION_TICKET_A;
else
s->state = SSL3_ST_SW_CHANGE_A;
s->init_num = 0;
break;
case SSL3_ST_SW_SESSION_TICKET_A:
case SSL3_ST_SW_SESSION_TICKET_B:
ret = ssl3_send_newsession_ticket(s);
if (ret <= 0)
goto end;
s->state = SSL3_ST_SW_CHANGE_A;
s->init_num = 0;
break;
case SSL3_ST_SW_CERT_STATUS_A:
case SSL3_ST_SW_CERT_STATUS_B:
ret = ssl3_send_cert_status(s);
if (ret <= 0)
goto end;
s->state = SSL3_ST_SW_KEY_EXCH_A;
s->init_num = 0;
break;
case SSL3_ST_SW_CHANGE_A:
case SSL3_ST_SW_CHANGE_B:
s->session->cipher = s->s3->tmp.new_cipher;
if (!s->method->ssl3_enc->setup_key_block(s)) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
ret = dtls1_send_change_cipher_spec(s, SSL3_ST_SW_CHANGE_A,
SSL3_ST_SW_CHANGE_B);
if (ret <= 0)
goto end;
s->state = SSL3_ST_SW_FINISHED_A;
s->init_num = 0;
if (!s->method->ssl3_enc->change_cipher_state(s,
SSL3_CHANGE_CIPHER_SERVER_WRITE))
{
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
break;
case SSL3_ST_SW_FINISHED_A:
case SSL3_ST_SW_FINISHED_B:
ret = ssl3_send_finished(s, SSL3_ST_SW_FINISHED_A, SSL3_ST_SW_FINISHED_B,
s->method->ssl3_enc->server_finished_label,
s->method->ssl3_enc->server_finished_label_len);
if (ret <= 0)
goto end;
s->state = SSL3_ST_SW_FLUSH;
if (s->hit) {
s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A;
} else {
s->s3->tmp.next_state = SSL_ST_OK;
}
s->init_num = 0;
break;
case SSL_ST_OK:
/* clean a few things up */
ssl3_cleanup_key_block(s);
/* remove buffering on output */
ssl_free_wbio_buffer(s);
s->init_num = 0;
if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
{
s->renegotiate = 0;
s->new_session = 0;
ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
s->ctx->stats.sess_accept_good++;
/* s->server=1; */
s->handshake_func = dtls1_accept;
if (cb != NULL)
cb(s, SSL_CB_HANDSHAKE_DONE, 1);
}
ret = 1;
/* done handshaking, next message is client hello */
s->d1->handshake_read_seq = 0;
/* next message is server hello */
s->d1->handshake_write_seq = 0;
s->d1->next_handshake_write_seq = 0;
dtls1_clear_received_buffer(s);
goto end;
/* break; */
case SSL_ST_ERR:
default:
SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE);
ret = -1;
goto end;
/* break; */
}
if (!s->s3->tmp.reuse_message && !skip) {
if (s->debug) {
if ((ret = BIO_flush(s->wbio)) <= 0)
goto end;
}
if ((cb != NULL) && (s->state != state)) {
new_state = s->state;
s->state = state;
cb(s, SSL_CB_ACCEPT_LOOP, 1);
s->state = new_state;
}
}
skip = 0;
}
end:
/* BIO_flush(s->wbio); */
s->in_handshake--;
if (cb != NULL)
cb(s, SSL_CB_ACCEPT_EXIT, ret);
return ret;
}
