int dtls1_connect(SSL *s) {
BUF_MEM *buf = NULL;
void (*cb)(const SSL *ssl, int type, int value) = NULL;
int ret = -1;
int new_state, state, skip = 0;
assert(s->handshake_func == dtls1_connect);
assert(!s->server);
assert(SSL_IS_DTLS(s));
ERR_clear_error();
ERR_clear_system_error();
if (s->info_callback != NULL) {
cb = s->info_callback;
} else if (s->ctx->info_callback != NULL) {
cb = s->ctx->info_callback;
}
s->in_handshake++;
for (;;) {
state = s->state;
switch (s->state) {
case SSL_ST_CONNECT:
if (cb != NULL) {
cb(s, SSL_CB_HANDSHAKE_START, 1);
}
if (s->init_buf == NULL) {
buf = BUF_MEM_new();
if (buf == NULL ||
!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
ret = -1;
goto end;
}
s->init_buf = buf;
buf = NULL;
}
if (!ssl_init_wbio_buffer(s, 0)) {
ret = -1;
goto end;
}
/* don't push the buffering BIO quite yet */
s->state = SSL3_ST_CW_CLNT_HELLO_A;
s->init_num = 0;
s->d1->send_cookie = 0;
s->hit = 0;
break;
case SSL3_ST_CW_CLNT_HELLO_A:
case SSL3_ST_CW_CLNT_HELLO_B:
s->shutdown = 0;
dtls1_start_timer(s);
ret = ssl3_send_client_hello(s);
if (ret <= 0) {
goto end;
}
if (s->d1->send_cookie) {
s->state = SSL3_ST_CW_FLUSH;
s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
} else {
s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
}
s->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 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;
}
if (s->d1->send_cookie) {
/* start again, with a cookie */
dtls1_stop_timer(s);
s->state = SSL3_ST_CW_CLNT_HELLO_A;
} else {
s->state = SSL3_ST_CR_SRVR_HELLO_A;
}
s->init_num = 0;
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;
}
if (s->hit) {
s->state = SSL3_ST_CR_FINISHED_A;
if (s->tlsext_ticket_expected) {
/* receive renewed session ticket */
s->state = SSL3_ST_CR_SESSION_TICKET_A;
}
} else {
s->state = SSL3_ST_CR_CERT_A;
}
s->init_num = 0;
break;
case SSL3_ST_CR_CERT_A:
case SSL3_ST_CR_CERT_B:
if (ssl_cipher_has_server_public_key(s->s3->tmp.new_cipher)) {
ret = ssl3_get_server_certificate(s);
if (ret <= 0) {
goto end;
}
if (s->s3->tmp.certificate_status_expected) {
s->state = SSL3_ST_CR_CERT_STATUS_A;
} else {
s->state = SSL3_ST_VERIFY_SERVER_CERT;
}
} else {
skip = 1;
s->state = SSL3_ST_CR_KEY_EXCH_A;
}
s->init_num = 0;
break;
case SSL3_ST_VERIFY_SERVER_CERT:
ret = ssl3_verify_server_cert(s);
if (ret <= 0) {
goto end;
}
s->state = SSL3_ST_CR_KEY_EXCH_A;
s->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;
}
s->state = SSL3_ST_CR_CERT_REQ_A;
s->init_num = 0;
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;
}
s->state = SSL3_ST_CR_SRVR_DONE_A;
s->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 (s->s3->tmp.cert_req) {
s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
} else {
s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
}
s->init_num = 0;
s->state = s->s3->tmp.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;
}
s->state = SSL3_ST_CW_KEY_EXCH_A;
s->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;
}
/* For TLS, cert_req is set to 2, so a cert chain
* of nothing is sent, but no verify packet is sent */
if (s->s3->tmp.cert_req == 1) {
s->state = SSL3_ST_CW_CERT_VRFY_A;
} else {
s->state = SSL3_ST_CW_CHANGE_A;
s->s3->change_cipher_spec = 0;
}
s->init_num = 0;
break;
case SSL3_ST_CW_CERT_VRFY_A:
case SSL3_ST_CW_CERT_VRFY_B:
case SSL3_ST_CW_CERT_VRFY_C:
dtls1_start_timer(s);
ret = ssl3_send_cert_verify(s);
if (ret <= 0) {
goto end;
}
s->state = SSL3_ST_CW_CHANGE_A;
s->init_num = 0;
s->s3->change_cipher_spec = 0;
break;
case SSL3_ST_CW_CHANGE_A:
case SSL3_ST_CW_CHANGE_B:
if (!s->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;
}
s->state = SSL3_ST_CW_FINISHED_A;
s->init_num = 0;
s->session->cipher = s->s3->tmp.new_cipher;
if (!s->enc_method->setup_key_block(s) ||
!s->enc_method->change_cipher_state(
s, SSL3_CHANGE_CIPHER_CLIENT_WRITE)) {
ret = -1;
goto end;
}
break;
case SSL3_ST_CW_FINISHED_A:
case SSL3_ST_CW_FINISHED_B:
if (!s->hit) {
dtls1_start_timer(s);
}
ret =
ssl3_send_finished(s, SSL3_ST_CW_FINISHED_A, SSL3_ST_CW_FINISHED_B,
s->enc_method->client_finished_label,
s->enc_method->client_finished_label_len);
if (ret <= 0) {
goto end;
}
s->state = SSL3_ST_CW_FLUSH;
if (s->hit) {
s->s3->tmp.next_state = SSL_ST_OK;
} else {
/* Allow NewSessionTicket if ticket expected */
if (s->tlsext_ticket_expected) {
s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
} else {
s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
}
}
s->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;
}
s->state = SSL3_ST_CR_FINISHED_A;
s->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;
}
s->state = SSL3_ST_VERIFY_SERVER_CERT;
s->init_num = 0;
break;
case SSL3_ST_CR_FINISHED_A:
case SSL3_ST_CR_FINISHED_B:
s->d1->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->hit) {
s->state = SSL3_ST_CW_CHANGE_A;
} else {
s->state = SSL_ST_OK;
}
s->init_num = 0;
break;
case SSL3_ST_CW_FLUSH:
s->rwstate = SSL_WRITING;
if (BIO_flush(s->wbio) <= 0) {
ret = -1;
goto end;
}
s->rwstate = SSL_NOTHING;
s->state = s->s3->tmp.next_state;
break;
case SSL_ST_OK:
/* clean a few things up */
ssl3_cleanup_key_block(s);
/* Remove write buffering now. */
ssl_free_wbio_buffer(s);
s->init_num = 0;
s->s3->initial_handshake_complete = 1;
ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
ret = 1;
if (cb != NULL) {
cb(s, SSL_CB_HANDSHAKE_DONE, 1);
}
/* done with handshaking */
s->d1->handshake_read_seq = 0;
s->d1->next_handshake_write_seq = 0;
goto end;
default:
OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_STATE);
ret = -1;
goto end;
}
/* did we do anything? */
if (!s->s3->tmp.reuse_message && !skip) {
if ((cb != NULL) && (s->state != state)) {
new_state = s->state;
s->state = state;
cb(s, SSL_CB_CONNECT_LOOP, 1);
s->state = new_state;
}
}
skip = 0;
}
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);
}
