/*
* Return zero if session tickets haven't been enabled.
*/
int _gnutls_recv_new_session_ticket(gnutls_session_t session)
{
uint8_t *p;
int data_size;
gnutls_buffer_st buf;
uint16_t ticket_len;
int ret;
session_ticket_ext_st *priv = NULL;
gnutls_ext_priv_data_t epriv;
if (session->internals.flags & GNUTLS_NO_TICKETS)
return 0;
if (!session->internals.session_ticket_renew)
return 0;
/* This is the last flight and peer cannot be sure
* we have received it unless we notify him. So we
* wait for a message and retransmit if needed. */
if (IS_DTLS(session) && !_dtls_is_async(session)) {
unsigned have;
mbuffer_st *bufel = NULL;
have = gnutls_record_check_pending(session) +
record_check_unprocessed(session);
if (have != 0) {
bufel = _mbuffer_head_get_first(&session->internals.record_buffer, NULL);
}
if (have == 0 || (bufel && bufel->type != GNUTLS_HANDSHAKE)) {
ret = _dtls_wait_and_retransmit(session);
if (ret < 0)
return gnutls_assert_val(ret);
}
}
ret = _gnutls_recv_handshake(session,
GNUTLS_HANDSHAKE_NEW_SESSION_TICKET,
0, &buf);
if (ret < 0)
return gnutls_assert_val_fatal(ret);
p = buf.data;
data_size = buf.length;
DECR_LENGTH_COM(data_size, 4, ret =
GNUTLS_E_UNEXPECTED_PACKET_LENGTH;
goto error);
/* skip over lifetime hint */
p += 4;
DECR_LENGTH_COM(data_size, 2, ret =
GNUTLS_E_UNEXPECTED_PACKET_LENGTH;
goto error);
ticket_len = _gnutls_read_uint16(p);
p += 2;
DECR_LENGTH_COM(data_size, ticket_len, ret =
GNUTLS_E_UNEXPECTED_PACKET_LENGTH;
goto error);
priv = gnutls_calloc(1, sizeof(*priv));
if (!priv) {
gnutls_assert();
ret = GNUTLS_E_MEMORY_ERROR;
goto error;
}
priv->session_ticket =
gnutls_realloc_fast(priv->session_ticket, ticket_len);
if (!priv->session_ticket) {
gnutls_free(priv);
gnutls_assert();
ret = GNUTLS_E_MEMORY_ERROR;
goto error;
}
memcpy(priv->session_ticket, p, ticket_len);
priv->session_ticket_len = ticket_len;
epriv = priv;
/* Discard the current session ID. (RFC5077 3.4) */
ret =
_gnutls_generate_session_id(session->security_parameters.
session_id,
&session->security_parameters.
session_id_size);
if (ret < 0) {
gnutls_assert();
session_ticket_deinit_data(epriv);
ret = GNUTLS_E_INTERNAL_ERROR;
goto error;
}
ret = 0;
_gnutls_handshake_log
("HSK[%p]: received session ticket\n", session);
session->internals.hsk_flags |= HSK_TICKET_RECEIVED;
_gnutls_hello_ext_set_priv(session,
GNUTLS_EXTENSION_SESSION_TICKET,
epriv);
error:
_gnutls_buffer_clear(&buf);
return ret;
}
/* returns the last stored handshake packet.
*/
static int get_last_packet(gnutls_session_t session,
gnutls_handshake_description_t htype,
handshake_buffer_st * hsk,
unsigned int optional)
{
handshake_buffer_st *recv_buf =
session->internals.handshake_recv_buffer;
if (IS_DTLS(session)) {
if (session->internals.handshake_recv_buffer_size == 0 ||
(session->internals.dtls.hsk_read_seq !=
recv_buf[LAST_ELEMENT].sequence))
goto timeout;
if (htype != recv_buf[LAST_ELEMENT].htype) {
if (optional == 0)
_gnutls_audit_log(session,
"Received unexpected handshake message '%s' (%d). Expected '%s' (%d)\n",
_gnutls_handshake2str
(recv_buf[0].htype),
(int) recv_buf[0].htype,
_gnutls_handshake2str
(htype), (int) htype);
return
gnutls_assert_val
(GNUTLS_E_UNEXPECTED_HANDSHAKE_PACKET);
}
else if ((recv_buf[LAST_ELEMENT].start_offset == 0 &&
recv_buf[LAST_ELEMENT].end_offset ==
recv_buf[LAST_ELEMENT].length - 1)
|| recv_buf[LAST_ELEMENT].length == 0) {
session->internals.dtls.hsk_read_seq++;
_gnutls_handshake_buffer_move(hsk,
&recv_buf
[LAST_ELEMENT]);
session->internals.handshake_recv_buffer_size--;
return 0;
} else {
/* if we don't have a complete handshake message, but we
* have queued data waiting, try again to reconstruct the
* handshake packet, using the queued */
if (recv_buf[LAST_ELEMENT].end_offset != recv_buf[LAST_ELEMENT].length - 1 &&
record_check_unprocessed(session) > 0)
return gnutls_assert_val(GNUTLS_E_INT_CHECK_AGAIN);
else
goto timeout;
}
} else { /* TLS */
if (session->internals.handshake_recv_buffer_size > 0
&& recv_buf[0].length == recv_buf[0].data.length) {
if (cmp_hsk_types(htype, recv_buf[0].htype) == 0) {
return
gnutls_assert_val
(GNUTLS_E_UNEXPECTED_HANDSHAKE_PACKET);
}
_gnutls_handshake_buffer_move(hsk, &recv_buf[0]);
session->internals.handshake_recv_buffer_size--;
return 0;
} else
return
gnutls_assert_val
(GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE);
}
timeout:
RETURN_DTLS_EAGAIN_OR_TIMEOUT(session, 0);
}
int _gnutls_recv_new_session_ticket(gnutls_session_t session)
{
uint8_t *p;
int data_size;
gnutls_buffer_st buf;
uint16_t ticket_len;
int ret;
session_ticket_ext_st *priv = NULL;
extension_priv_data_t epriv;
ret =
_gnutls_ext_get_session_data(session,
GNUTLS_EXTENSION_SESSION_TICKET,
&epriv);
if (ret < 0) {
gnutls_assert();
return 0;
}
priv = epriv;
if (!priv->session_ticket_renew)
return 0;
/* This is the last flight and peer cannot be sure
* we have received it unless we notify him. So we
* wait for a message and retransmit if needed. */
if (IS_DTLS(session) && !_dtls_is_async(session) &&
(gnutls_record_check_pending(session) +
record_check_unprocessed(session)) == 0) {
ret = _dtls_wait_and_retransmit(session);
if (ret < 0)
return gnutls_assert_val(ret);
}
ret = _gnutls_recv_handshake(session,
GNUTLS_HANDSHAKE_NEW_SESSION_TICKET,
0, &buf);
if (ret < 0)
return gnutls_assert_val_fatal(ret);
p = buf.data;
data_size = buf.length;
DECR_LENGTH_COM(data_size, 4, ret =
GNUTLS_E_UNEXPECTED_PACKET_LENGTH;
goto error);
/* skip over lifetime hint */
p += 4;
DECR_LENGTH_COM(data_size, 2, ret =
GNUTLS_E_UNEXPECTED_PACKET_LENGTH;
goto error);
ticket_len = _gnutls_read_uint16(p);
p += 2;
DECR_LENGTH_COM(data_size, ticket_len, ret =
GNUTLS_E_UNEXPECTED_PACKET_LENGTH;
goto error);
priv->session_ticket =
gnutls_realloc_fast(priv->session_ticket, ticket_len);
if (!priv->session_ticket) {
gnutls_assert();
ret = GNUTLS_E_MEMORY_ERROR;
goto error;
}
memcpy(priv->session_ticket, p, ticket_len);
priv->session_ticket_len = ticket_len;
/* Discard the current session ID. (RFC5077 3.4) */
ret =
_gnutls_generate_session_id(session->security_parameters.
session_id,
&session->security_parameters.
session_id_size);
if (ret < 0) {
gnutls_assert();
gnutls_free(priv->session_ticket);
priv->session_ticket = NULL;
ret = GNUTLS_E_INTERNAL_ERROR;
goto error;
}
ret = 0;
error:
_gnutls_buffer_clear(&buf);
return ret;
}
