/* * 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; }
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; }