static void dtls1_clear_queues(SSL *s)
{
pitem *item = NULL;
DTLS1_RECORD_DATA *rdata;
while ((item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL) {
rdata = (DTLS1_RECORD_DATA *)item->data;
if (rdata->rbuf.buf) {
OPENSSL_free(rdata->rbuf.buf);
}
OPENSSL_free(item->data);
pitem_free(item);
}
while ((item = pqueue_pop(s->d1->processed_rcds.q)) != NULL) {
rdata = (DTLS1_RECORD_DATA *)item->data;
if (rdata->rbuf.buf) {
OPENSSL_free(rdata->rbuf.buf);
}
OPENSSL_free(item->data);
pitem_free(item);
}
while ((item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL) {
rdata = (DTLS1_RECORD_DATA *)item->data;
if (rdata->rbuf.buf) {
OPENSSL_free(rdata->rbuf.buf);
}
OPENSSL_free(item->data);
pitem_free(item);
}
dtls1_clear_received_buffer(s);
dtls1_clear_sent_buffer(s);
}
WORK_STATE tls_finish_handshake(SSL *s, WORK_STATE wst)
{
void (*cb) (const SSL *ssl, int type, int val) = NULL;
#ifndef OPENSSL_NO_SCTP
if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))) {
WORK_STATE ret;
ret = dtls_wait_for_dry(s);
if (ret != WORK_FINISHED_CONTINUE)
return ret;
}
#endif
/* clean a few things up */
ssl3_cleanup_key_block(s);
if (!SSL_IS_DTLS(s)) {
/*
* We don't do this in DTLS because we may still need the init_buf
* in case there are any unexpected retransmits
*/
BUF_MEM_free(s->init_buf);
s->init_buf = NULL;
}
ssl_free_wbio_buffer(s);
s->init_num = 0;
if (!s->server || s->renegotiate == 2) {
/* skipped if we just sent a HelloRequest */
s->renegotiate = 0;
s->new_session = 0;
if (s->server) {
ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
s->ctx->stats.sess_accept_good++;
s->handshake_func = ossl_statem_accept;
} else {
ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
if (s->hit)
s->ctx->stats.sess_hit++;
s->handshake_func = ossl_statem_connect;
s->ctx->stats.sess_connect_good++;
}
if (s->info_callback != NULL)
cb = s->info_callback;
else if (s->ctx->info_callback != NULL)
cb = s->ctx->info_callback;
if (cb != NULL)
cb(s, SSL_CB_HANDSHAKE_DONE, 1);
if (SSL_IS_DTLS(s)) {
/* done with handshaking */
s->d1->handshake_read_seq = 0;
s->d1->handshake_write_seq = 0;
s->d1->next_handshake_write_seq = 0;
dtls1_clear_received_buffer(s);
}
}
return WORK_FINISHED_STOP;
}
static void dtls1_clear_queues(SSL *s)
{
dtls1_clear_received_buffer(s);
dtls1_clear_sent_buffer(s);
}
int dtls1_accept(SSL *s)
{
BUF_MEM *buf;
unsigned long Time = (unsigned long)time(NULL);
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;
#ifndef OPENSSL_NO_SCTP
unsigned char sctpauthkey[64];
char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
#endif
RAND_add(&Time, sizeof(Time), 0);
ERR_clear_error();
clear_sys_error();
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;
#ifndef OPENSSL_NO_SCTP
/*
* 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,
s->in_handshake, NULL);
#endif
if (s->cert == NULL) {
SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET);
return (-1);
}
#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) {
dtls1_stop_timer(s);
s->tlsext_hb_pending = 0;
s->tlsext_hb_seq++;
}
#endif
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) {
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 :-)
*/
#ifndef OPENSSL_NO_SCTP
if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
#endif
if (!ssl_init_wbio_buffer(s, 1)) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
ssl3_init_finished_mac(s);
s->state = SSL3_ST_SR_CLNT_HELLO_A;
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_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;
ssl3_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 */
if (s->version != DTLS1_BAD_VER)
ssl3_init_finished_mac(s);
break;
#ifndef OPENSSL_NO_SCTP
case DTLS1_SCTP_ST_SR_READ_SOCK:
if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
s->s3->in_read_app_data = 2;
s->rwstate = SSL_READING;
BIO_clear_retry_flags(SSL_get_rbio(s));
BIO_set_retry_read(SSL_get_rbio(s));
ret = -1;
goto end;
}
s->state = SSL3_ST_SR_FINISHED_A;
break;
case DTLS1_SCTP_ST_SW_WRITE_SOCK:
ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
if (ret < 0)
goto end;
if (ret == 0) {
if (s->d1->next_state != SSL_ST_OK) {
s->s3->in_read_app_data = 2;
s->rwstate = SSL_READING;
BIO_clear_retry_flags(SSL_get_rbio(s));
BIO_set_retry_read(SSL_get_rbio(s));
ret = -1;
goto end;
}
}
s->state = s->d1->next_state;
break;
#endif
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) {
#ifndef OPENSSL_NO_SCTP
/*
* Add new shared key for SCTP-Auth, will be ignored if no
* SCTP used.
*/
snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
DTLS1_SCTP_AUTH_LABEL);
if (SSL_export_keying_material(s, sctpauthkey,
sizeof(sctpauthkey), labelbuffer,
sizeof(labelbuffer), NULL, 0, 0) <= 0) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
sizeof(sctpauthkey), sctpauthkey);
#endif
#ifndef OPENSSL_NO_TLSEXT
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_CHANGE_A;
#endif
} 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 or normal PSK */
if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
&& !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
dtls1_start_timer(s);
ret = ssl3_send_server_certificate(s);
if (ret <= 0)
goto end;
#ifndef OPENSSL_NO_TLSEXT
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;
}
#else
} else
skip = 1;
s->state = SSL3_ST_SW_KEY_EXCH_A;
#endif
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;
/*
* clear this, it may get reset by
* send_server_key_exchange
*/
s->s3->tmp.use_rsa_tmp = 0;
/*
* only send if a DH key exchange or RSA but we have a sign only
* certificate
*/
if (0
/*
* PSK: send ServerKeyExchange if PSK identity hint if
* provided
*/
#ifndef OPENSSL_NO_PSK
|| ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
#endif
|| (alg_k & SSL_kDHE)
|| (alg_k & SSL_kEECDH)
|| ((alg_k & SSL_kRSA)
&& (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
|| (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
&& EVP_PKEY_size(s->cert->pkeys
[SSL_PKEY_RSA_ENC].privatekey) *
8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
)
)
)
) {
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:
if ( /* don't request cert unless asked for it: */
!(s->verify_mode & SSL_VERIFY_PEER) ||
/*
* if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
* during re-negotiation:
*/
((s->session->peer != NULL) &&
(s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
/*
* never request cert in anonymous ciphersuites (see
* section "Certificate request" in SSL 3 drafts and in
* RFC 2246):
*/
((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
/*
* ... except when the application insists on
* verification (against the specs, but s3_clnt.c accepts
* this for SSL 3)
*/
!(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
/*
* never request cert in Kerberos ciphersuites
*/
(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
/*
* With normal PSK Certificates and Certificate Requests
* are omitted
*/
|| (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
/* no cert request */
skip = 1;
s->s3->tmp.cert_request = 0;
s->state = SSL3_ST_SW_SRVR_DONE_A;
#ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
}
#endif
} else {
s->s3->tmp.cert_request = 1;
dtls1_start_timer(s);
ret = ssl3_send_certificate_request(s);
if (ret <= 0)
goto end;
#ifndef NETSCAPE_HANG_BUG
s->state = SSL3_ST_SW_SRVR_DONE_A;
# ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
}
# endif
#else
s->state = SSL3_ST_SW_FLUSH;
s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
# ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
s->d1->next_state = s->s3->tmp.next_state;
s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
}
# endif
#endif
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;
#ifndef OPENSSL_NO_SCTP
/*
* Add new shared key for SCTP-Auth, will be ignored if no SCTP
* used.
*/
snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
DTLS1_SCTP_AUTH_LABEL);
if (SSL_export_keying_material(s, sctpauthkey,
sizeof(sctpauthkey), labelbuffer,
sizeof(labelbuffer), NULL, 0, 0) <= 0) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
sizeof(sctpauthkey), sctpauthkey);
#endif
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 (!ssl3_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;
#ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
state == SSL_ST_RENEGOTIATE)
s->state = DTLS1_SCTP_ST_SR_READ_SOCK;
else
#endif
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;
#ifndef OPENSSL_NO_TLSEXT
else if (s->tlsext_ticket_expected)
s->state = SSL3_ST_SW_SESSION_TICKET_A;
#endif
else
s->state = SSL3_ST_SW_CHANGE_A;
s->init_num = 0;
break;
#ifndef OPENSSL_NO_TLSEXT
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;
#endif
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;
#ifndef OPENSSL_NO_SCTP
if (!s->hit) {
/*
* Change to new shared key of SCTP-Auth, will be ignored if
* no SCTP used.
*/
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
0, NULL);
}
#endif
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;
#ifndef OPENSSL_NO_SCTP
/*
* Change to new shared key of SCTP-Auth, will be ignored if
* no SCTP used.
*/
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
0, NULL);
#endif
} else {
s->s3->tmp.next_state = SSL_ST_OK;
#ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
s->d1->next_state = s->s3->tmp.next_state;
s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
}
#endif
}
s->init_num = 0;
break;
case SSL_ST_OK:
/* clean a few things up */
ssl3_cleanup_key_block(s);
#if 0
BUF_MEM_free(s->init_buf);
s->init_buf = NULL;
#endif
/* 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; */
}
int dtls1_connect(SSL *s)
{
BUF_MEM *buf = NULL;
unsigned long Time = (unsigned long)time(NULL);
void (*cb) (const SSL *ssl, int type, int val) = NULL;
int ret = -1;
int new_state, state, skip = 0;
#ifndef OPENSSL_NO_SCTP
unsigned char sctpauthkey[64];
char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
#endif
RAND_add(&Time, sizeof(Time), 0);
ERR_clear_error();
clear_sys_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++;
if (!SSL_in_init(s) || SSL_in_before(s))
SSL_clear(s);
#ifndef OPENSSL_NO_SCTP
/*
* 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,
s->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) {
dtls1_stop_timer(s);
s->tlsext_hb_pending = 0;
s->tlsext_hb_seq++;
}
#endif
for (;;) {
state = s->state;
switch (s->state) {
case SSL_ST_RENEGOTIATE:
s->renegotiate = 1;
s->state = SSL_ST_CONNECT;
s->ctx->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) &&
(s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) {
SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
/* s->version=SSL3_VERSION; */
s->type = SSL_ST_CONNECT;
if (s->init_buf == NULL) {
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)) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
s->init_buf = buf;
buf = NULL;
}
if (!ssl3_setup_buffers(s)) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
/* setup buffing BIO */
if (!ssl_init_wbio_buffer(s, 0)) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
/* don't push the buffering BIO quite yet */
s->state = SSL3_ST_CW_CLNT_HELLO_A;
s->ctx->stats.sess_connect++;
s->init_num = 0;
/* mark client_random uninitialized */
memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
s->d1->send_cookie = 0;
s->hit = 0;
s->d1->change_cipher_spec_ok = 0;
/*
* Should have been reset by ssl3_get_finished, too.
*/
s->s3->change_cipher_spec = 0;
break;
#ifndef OPENSSL_NO_SCTP
case DTLS1_SCTP_ST_CR_READ_SOCK:
if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
s->s3->in_read_app_data = 2;
s->rwstate = SSL_READING;
BIO_clear_retry_flags(SSL_get_rbio(s));
BIO_set_retry_read(SSL_get_rbio(s));
ret = -1;
goto end;
}
s->state = s->s3->tmp.next_state;
break;
case DTLS1_SCTP_ST_CW_WRITE_SOCK:
/* read app data until dry event */
ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
if (ret < 0)
goto end;
if (ret == 0) {
s->s3->in_read_app_data = 2;
s->rwstate = SSL_READING;
BIO_clear_retry_flags(SSL_get_rbio(s));
BIO_set_retry_read(SSL_get_rbio(s));
ret = -1;
goto end;
}
s->state = s->d1->next_state;
break;
#endif
case SSL3_ST_CW_CLNT_HELLO_A:
s->shutdown = 0;
/* every DTLS ClientHello resets Finished MAC */
ssl3_init_finished_mac(s);
case SSL3_ST_CW_CLNT_HELLO_B:
dtls1_start_timer(s);
ret = ssl3_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 = SSL3_ST_CR_SRVR_HELLO_A;
s->init_num = 0;
#ifndef OPENSSL_NO_SCTP
/* Disable buffering for SCTP */
if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) {
#endif
/*
* turn on buffering for the next lot of output
*/
if (s->bbio != s->wbio)
s->wbio = BIO_push(s->bbio, s->wbio);
#ifndef OPENSSL_NO_SCTP
}
#endif
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->hit) {
#ifndef OPENSSL_NO_SCTP
/*
* Add new shared key for SCTP-Auth, will be ignored if
* no SCTP used.
*/
snprintf((char *)labelbuffer,
sizeof(DTLS1_SCTP_AUTH_LABEL),
DTLS1_SCTP_AUTH_LABEL);
if (SSL_export_keying_material(s, sctpauthkey,
sizeof(sctpauthkey),
labelbuffer,
sizeof(labelbuffer), NULL, 0,
0) <= 0) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
BIO_ctrl(SSL_get_wbio(s),
BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
sizeof(sctpauthkey), sctpauthkey);
#endif
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 = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
}
s->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 (s->d1->send_cookie) /* start again, with a cookie */
s->state = SSL3_ST_CW_CLNT_HELLO_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:
/* Check if it is anon DH or PSK */
if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
!(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
ret = ssl3_get_server_certificate(s);
if (ret <= 0)
goto end;
#ifndef OPENSSL_NO_TLSEXT
if (s->tlsext_status_expected)
s->state = SSL3_ST_CR_CERT_STATUS_A;
else
s->state = SSL3_ST_CR_KEY_EXCH_A;
} else {
skip = 1;
s->state = SSL3_ST_CR_KEY_EXCH_A;
}
#else
} else
skip = 1;
s->state = SSL3_ST_CR_KEY_EXCH_A;
#endif
s->init_num = 0;
break;
case SSL3_ST_CR_KEY_EXCH_A:
case SSL3_ST_CR_KEY_EXCH_B:
ret = ssl3_get_key_exchange(s);
if (ret <= 0)
goto end;
s->state = SSL3_ST_CR_CERT_REQ_A;
s->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;
s->state = SSL_ST_ERR;
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;
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;
#ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
state == SSL_ST_RENEGOTIATE)
s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
else
#endif
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;
#ifndef OPENSSL_NO_SCTP
/*
* Add new shared key for SCTP-Auth, will be ignored if no SCTP
* used.
*/
snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
DTLS1_SCTP_AUTH_LABEL);
if (SSL_export_keying_material(s, sctpauthkey,
sizeof(sctpauthkey), labelbuffer,
sizeof(labelbuffer), NULL, 0, 0) <= 0) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
sizeof(sctpauthkey), sctpauthkey);
#endif
/*
* 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 (s->s3->tmp.cert_req == 1) {
s->state = SSL3_ST_CW_CERT_VRFY_A;
} else {
#ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
s->d1->next_state = SSL3_ST_CW_CHANGE_A;
s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
} else
#endif
s->state = SSL3_ST_CW_CHANGE_A;
}
s->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;
#ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
s->d1->next_state = SSL3_ST_CW_CHANGE_A;
s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
} else
#endif
s->state = SSL3_ST_CW_CHANGE_A;
s->init_num = 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;
#ifdef OPENSSL_NO_COMP
s->session->compress_meth = 0;
#else
if (s->s3->tmp.new_compression == NULL)
s->session->compress_meth = 0;
else
s->session->compress_meth = s->s3->tmp.new_compression->id;
#endif
if (!s->method->ssl3_enc->setup_key_block(s)) {
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
if (!s->method->ssl3_enc->change_cipher_state(s,
SSL3_CHANGE_CIPHER_CLIENT_WRITE))
{
ret = -1;
s->state = SSL_ST_ERR;
goto end;
}
#ifndef OPENSSL_NO_SCTP
if (s->hit) {
/*
* Change to new shared key of SCTP-Auth, will be ignored if
* no SCTP used.
*/
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
0, NULL);
}
#endif
dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
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->method->
ssl3_enc->client_finished_label,
s->method->
ssl3_enc->client_finished_label_len);
if (ret <= 0)
goto end;
s->state = SSL3_ST_CW_FLUSH;
/* clear flags */
s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
if (s->hit) {
s->s3->tmp.next_state = SSL_ST_OK;
#ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
s->d1->next_state = s->s3->tmp.next_state;
s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
}
#endif
if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
s->state = SSL_ST_OK;
#ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
s->d1->next_state = SSL_ST_OK;
s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
}
#endif
s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
s->s3->delay_buf_pop_ret = 0;
}
} else {
#ifndef OPENSSL_NO_SCTP
/*
* Change to new shared key of SCTP-Auth, will be ignored if
* no SCTP used.
*/
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
0, NULL);
#endif
#ifndef OPENSSL_NO_TLSEXT
/*
* Allow NewSessionTicket if ticket expected
*/
if (s->tlsext_ticket_expected)
s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
else
#endif
s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
}
s->init_num = 0;
break;
#ifndef OPENSSL_NO_TLSEXT
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_CR_KEY_EXCH_A;
s->init_num = 0;
break;
#endif
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;
#ifndef OPENSSL_NO_SCTP
if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
state == SSL_ST_RENEGOTIATE) {
s->d1->next_state = s->state;
s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
}
#endif
s->init_num = 0;
break;
case SSL3_ST_CW_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 SSL_ST_OK:
/* clean a few things up */
ssl3_cleanup_key_block(s);
#if 0
if (s->init_buf != NULL) {
BUF_MEM_free(s->init_buf);
s->init_buf = NULL;
}
#endif
/*
* 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->init_num = 0;
s->renegotiate = 0;
s->new_session = 0;
ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
if (s->hit)
s->ctx->stats.sess_hit++;
ret = 1;
/* s->server=0; */
s->handshake_func = dtls1_connect;
s->ctx->stats.sess_connect_good++;
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;
dtls1_clear_received_buffer(s);
goto end;
/* break; */
case SSL_ST_ERR:
default:
SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
ret = -1;
goto end;
/* break; */
}
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;
}
