mirror of
https://github.com/vel21ripn/nDPI.git
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304 lines
11 KiB
C
304 lines
11 KiB
C
/*
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* jabber.c
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*
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* Copyright (C) 2009-2011 by ipoque GmbH
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* Copyright (C) 2011-19 - ntop.org
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*
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* This file is part of nDPI, an open source deep packet inspection
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* library based on the OpenDPI and PACE technology by ipoque GmbH
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*
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* nDPI is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* nDPI is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "ndpi_protocol_ids.h"
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#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_UNENCRYPTED_JABBER
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#include "ndpi_api.h"
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struct jabber_string {
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char *string;
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u_int ndpi_protocol;
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};
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static struct jabber_string jabber_strings[] = {
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{ "='im.truphone.com'", NDPI_PROTOCOL_TRUPHONE },
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{ "=\"im.truphone.com\"", NDPI_PROTOCOL_TRUPHONE },
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{ NULL, 0 }
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};
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static void ndpi_int_jabber_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
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struct ndpi_flow_struct *flow,
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u_int32_t protocol)
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{
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ndpi_set_detected_protocol(ndpi_struct, flow, protocol, NDPI_PROTOCOL_UNKNOWN);
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}
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static void check_content_type_and_change_protocol(struct ndpi_detection_module_struct *ndpi_struct,
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struct ndpi_flow_struct *flow, u_int16_t x)
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{
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struct ndpi_packet_struct *packet = &flow->packet;
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int i, left = packet->payload_packet_len-x;
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if(left <= 0) return;
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for(i=0; jabber_strings[i].string != NULL; i++) {
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if(ndpi_strnstr((const char*)&packet->payload[x], jabber_strings[i].string, left) != NULL) {
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ndpi_int_jabber_add_connection(ndpi_struct, flow, jabber_strings[i].ndpi_protocol);
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return;
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}
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}
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}
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void ndpi_search_jabber_tcp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
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{
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struct ndpi_packet_struct *packet = &flow->packet;
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struct ndpi_id_struct *src = flow->src;
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struct ndpi_id_struct *dst = flow->dst;
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u_int16_t x;
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NDPI_LOG_DBG(ndpi_struct, "search JABBER\n");
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/* search for jabber file transfer */
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/* this part is working asymmetrically */
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if (packet->tcp != NULL && packet->tcp->syn != 0 && packet->payload_packet_len == 0) {
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NDPI_LOG_DBG2(ndpi_struct, "check jabber syn\n");
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if (src != NULL && src->jabber_file_transfer_port[0] != 0) {
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NDPI_LOG_DBG2(ndpi_struct, "src jabber ft port set, ports are: %u, %u\n",
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ntohs(src->jabber_file_transfer_port[0]),
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ntohs(src->jabber_file_transfer_port[1]));
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if (((u_int32_t)
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(packet->tick_timestamp - src->jabber_stun_or_ft_ts)) >= ndpi_struct->jabber_file_transfer_timeout) {
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NDPI_LOG_DBG2(ndpi_struct, "JABBER src stun timeout %u %u\n",
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src->jabber_stun_or_ft_ts, packet->tick_timestamp);
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src->jabber_file_transfer_port[0] = 0;
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src->jabber_file_transfer_port[1] = 0;
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} else if (src->jabber_file_transfer_port[0] == packet->tcp->dest
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|| src->jabber_file_transfer_port[0] == packet->tcp->source
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|| src->jabber_file_transfer_port[1] == packet->tcp->dest
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|| src->jabber_file_transfer_port[1] == packet->tcp->source) {
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NDPI_LOG_INFO(ndpi_struct, "found jabber file transfer\n");
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ndpi_int_jabber_add_connection(ndpi_struct, flow,
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NDPI_PROTOCOL_UNENCRYPTED_JABBER);
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}
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}
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if (dst != NULL && dst->jabber_file_transfer_port[0] != 0) {
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NDPI_LOG_DBG2(ndpi_struct, "dst jabber ft port set, ports are: %u, %u\n",
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ntohs(dst->jabber_file_transfer_port[0]),
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ntohs(dst->jabber_file_transfer_port[1]));
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if (((u_int32_t)
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(packet->tick_timestamp - dst->jabber_stun_or_ft_ts)) >= ndpi_struct->jabber_file_transfer_timeout) {
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NDPI_LOG_DBG2(ndpi_struct, "JABBER dst stun timeout %u %u\n",
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dst->jabber_stun_or_ft_ts, packet->tick_timestamp);
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dst->jabber_file_transfer_port[0] = 0;
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dst->jabber_file_transfer_port[1] = 0;
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} else if (dst->jabber_file_transfer_port[0] == packet->tcp->dest
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|| dst->jabber_file_transfer_port[0] == packet->tcp->source
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|| dst->jabber_file_transfer_port[1] == packet->tcp->dest
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|| dst->jabber_file_transfer_port[1] == packet->tcp->source) {
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NDPI_LOG_INFO(ndpi_struct, "found jabber file transfer\n");
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ndpi_int_jabber_add_connection(ndpi_struct, flow,
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NDPI_PROTOCOL_UNENCRYPTED_JABBER);
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}
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}
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return;
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}
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if (packet->tcp != 0 && packet->payload_packet_len == 0) {
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return;
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}
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/* this part parses a packet and searches for port=. it works asymmetrically. */
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if (packet->detected_protocol_stack[0] == NDPI_PROTOCOL_UNENCRYPTED_JABBER) {
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u_int16_t lastlen;
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u_int16_t j_port = 0;
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/* check for google jabber voip connections ... */
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/* need big packet */
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if (packet->payload_packet_len < 100) {
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NDPI_LOG_DBG2(ndpi_struct, "packet too small, return\n");
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return;
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}
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/* need message to or type for file-transfer */
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if (memcmp(packet->payload, "<iq from=\"", 8) == 0 || memcmp(packet->payload, "<iq from=\'", 8) == 0) {
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NDPI_LOG_DBG2(ndpi_struct, "JABBER <iq from=\"\n");
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lastlen = packet->payload_packet_len - 11;
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for (x = 10; x < lastlen; x++) {
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if (packet->payload[x] == 'p') {
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if (memcmp(&packet->payload[x], "port=", 5) == 0) {
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NDPI_LOG_DBG2(ndpi_struct, "port=\n");
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if (src != NULL) {
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src->jabber_stun_or_ft_ts = packet->tick_timestamp;
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}
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if (dst != NULL) {
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dst->jabber_stun_or_ft_ts = packet->tick_timestamp;
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}
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x += 6;
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j_port = ntohs_ndpi_bytestream_to_number(&packet->payload[x], packet->payload_packet_len, &x);
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NDPI_LOG_DBG2(ndpi_struct, "JABBER port : %u\n", ntohs(j_port));
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if (src != NULL) {
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if (src->jabber_file_transfer_port[0] == 0 || src->jabber_file_transfer_port[0] == j_port) {
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NDPI_LOG_DBG2(ndpi_struct, "src->jabber_file_transfer_port[0] = j_port = %u;\n",
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ntohs(j_port));
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src->jabber_file_transfer_port[0] = j_port;
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} else {
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NDPI_LOG_DBG2(ndpi_struct, "src->jabber_file_transfer_port[1] = j_port = %u;\n",
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ntohs(j_port));
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src->jabber_file_transfer_port[1] = j_port;
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}
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}
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if (dst != NULL) {
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if (dst->jabber_file_transfer_port[0] == 0 || dst->jabber_file_transfer_port[0] == j_port) {
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NDPI_LOG_DBG2(ndpi_struct, "dst->jabber_file_transfer_port[0] = j_port = %u;\n",
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ntohs(j_port));
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dst->jabber_file_transfer_port[0] = j_port;
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} else {
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NDPI_LOG_DBG2(ndpi_struct, "dst->jabber_file_transfer_port[1] = j_port = %u;\n",
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ntohs(j_port));
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dst->jabber_file_transfer_port[1] = j_port;
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}
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}
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}
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}
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}
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} else if (memcmp(packet->payload, "<iq to=\"", 8) == 0 || memcmp(packet->payload, "<iq to=\'", 8) == 0
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|| memcmp(packet->payload, "<iq type=", 9) == 0) {
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NDPI_LOG_DBG2(ndpi_struct, "JABBER <iq to=\"/type=\"\n");
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lastlen = packet->payload_packet_len - 21;
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for (x = 8; x < lastlen; x++) {
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/* invalid character */
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if (packet->payload[x] < 32 || packet->payload[x] > 127) {
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return;
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}
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if (packet->payload[x] == '@') {
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NDPI_LOG_DBG2(ndpi_struct, "JABBER @\n");
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break;
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}
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}
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if (x >= lastlen) {
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return;
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}
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lastlen = packet->payload_packet_len - 10;
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for (; x < lastlen; x++) {
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if (packet->payload[x] == 'p') {
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if (memcmp(&packet->payload[x], "port=", 5) == 0) {
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NDPI_LOG_DBG2(ndpi_struct, "port=\n");
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if (src != NULL) {
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src->jabber_stun_or_ft_ts = packet->tick_timestamp;
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}
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if (dst != NULL) {
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dst->jabber_stun_or_ft_ts = packet->tick_timestamp;
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}
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x += 6;
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j_port = ntohs_ndpi_bytestream_to_number(&packet->payload[x], packet->payload_packet_len, &x);
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NDPI_LOG_DBG2(ndpi_struct, "JABBER port : %u\n", ntohs(j_port));
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if (src != NULL && src->jabber_voice_stun_used_ports < JABBER_MAX_STUN_PORTS - 1) {
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if (packet->payload[5] == 'o') {
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src->jabber_voice_stun_port[src->jabber_voice_stun_used_ports++]
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= j_port;
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} else {
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if (src->jabber_file_transfer_port[0] == 0
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|| src->jabber_file_transfer_port[0] == j_port) {
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NDPI_LOG_DBG2(ndpi_struct, "src->jabber_file_transfer_port[0] = j_port = %u;\n",
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ntohs(j_port));
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src->jabber_file_transfer_port[0] = j_port;
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} else {
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NDPI_LOG_DBG2(ndpi_struct, "src->jabber_file_transfer_port[1] = j_port = %u;\n",
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ntohs(j_port));
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src->jabber_file_transfer_port[1] = j_port;
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}
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}
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}
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if (dst != NULL && dst->jabber_voice_stun_used_ports < JABBER_MAX_STUN_PORTS - 1) {
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if (packet->payload[5] == 'o') {
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dst->jabber_voice_stun_port[dst->jabber_voice_stun_used_ports++]
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= j_port;
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} else {
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if (dst->jabber_file_transfer_port[0] == 0
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|| dst->jabber_file_transfer_port[0] == j_port) {
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NDPI_LOG_DBG2(ndpi_struct, "dst->jabber_file_transfer_port[0] = j_port = %u;\n",
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ntohs(j_port));
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dst->jabber_file_transfer_port[0] = j_port;
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} else {
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NDPI_LOG_DBG2(ndpi_struct, "dst->jabber_file_transfer_port[1] = j_port = %u;\n",
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ntohs(j_port));
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dst->jabber_file_transfer_port[1] = j_port;
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}
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}
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}
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return;
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}
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}
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}
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}
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return;
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}
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/* search for jabber here */
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/* this part is working asymmetrically */
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if ((packet->payload_packet_len > 13 && memcmp(packet->payload, "<?xml version=", 14) == 0)
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|| (packet->payload_packet_len >= NDPI_STATICSTRING_LEN("<stream:stream ")
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&& memcmp(packet->payload, "<stream:stream ", NDPI_STATICSTRING_LEN("<stream:stream ")) == 0)) {
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int start = packet->payload_packet_len-13;
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if(ndpi_strnstr((const char *)&packet->payload[13], "xmlns:stream='http://etherx.jabber.org/streams'", start)
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|| ndpi_strnstr((const char *)&packet->payload[13], "xmlns:stream=\"http://etherx.jabber.org/streams\"", start)) {
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/* Protocol family */
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ndpi_int_jabber_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_UNENCRYPTED_JABBER);
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/* search for subprotocols */
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check_content_type_and_change_protocol(ndpi_struct, flow, 13);
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return;
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}
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}
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if (flow->packet_counter < 3) {
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NDPI_LOG_DBG2(ndpi_struct, "packet_counter: %u\n", flow->packet_counter);
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return;
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}
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NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
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ndpi_exclude_protocol(ndpi_struct, flow, NDPI_PROTOCOL_TRUPHONE,
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__FILE__,__FUNCTION__,__LINE__);
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}
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void init_jabber_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
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{
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ndpi_set_bitmask_protocol_detection("Unencrypted_Jabber", ndpi_struct, detection_bitmask, *id,
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NDPI_PROTOCOL_UNENCRYPTED_JABBER,
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ndpi_search_jabber_tcp,
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NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITHOUT_RETRANSMISSION,
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SAVE_DETECTION_BITMASK_AS_UNKNOWN,
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ADD_TO_DETECTION_BITMASK);
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*id += 1;
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}
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