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Diffstat (limited to 'src/lib/protocols/netbios.c')
-rw-r--r--src/lib/protocols/netbios.c368
1 files changed, 368 insertions, 0 deletions
diff --git a/src/lib/protocols/netbios.c b/src/lib/protocols/netbios.c
new file mode 100644
index 000000000..41f13b0f6
--- /dev/null
+++ b/src/lib/protocols/netbios.c
@@ -0,0 +1,368 @@
+/*
+ * netbios.c
+ *
+ * Copyright (C) 2009-2011 by ipoque GmbH
+ * Copyright (C) 2011-15 - ntop.org
+ *
+ * This file is part of nDPI, an open source deep packet inspection
+ * library based on the OpenDPI and PACE technology by ipoque GmbH
+ *
+ * nDPI is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * nDPI is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with nDPI. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+
+#include "ndpi_protocols.h"
+
+#ifdef NDPI_PROTOCOL_NETBIOS
+
+/* The function below has been inherited by tcpdump */
+static int netbios_name_interpret(char *in, char *out, u_int out_len) {
+ int ret, len;
+ char *b;
+
+ len = (*in++)/2;
+ b = out;
+ *out=0;
+
+ if(len > (out_len-1) || len < 1)
+ return(-1);
+
+ while (len--) {
+ if(in[0] < 'A' || in[0] > 'P' || in[1] < 'A' || in[1] > 'P') {
+ *out = 0;
+ return(-1);
+ }
+
+ *out = ((in[0]-'A')<<4) + (in[1]-'A');
+ in += 2;
+ out++;
+ }
+ ret = *(--out);
+ *out = 0;
+
+ /* Courtesy of Roberto F. De Luca <deluca@tandar.cnea.gov.ar> */
+ /* Trim trailing whitespace from the returned string */
+ for(out--; out>=b && *out==' '; out--) *out = '\0';
+
+ return(ret);
+}
+
+
+static void ndpi_int_netbios_add_connection(struct ndpi_detection_module_struct
+ *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+ ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_NETBIOS, NDPI_REAL_PROTOCOL);
+}
+
+
+void ndpi_search_netbios(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+ struct ndpi_packet_struct *packet = &flow->packet;
+
+ // struct ndpi_id_struct *src=ndpi_struct->src;
+ // struct ndpi_id_struct *dst=ndpi_struct->dst;
+
+
+ u_int16_t dport;
+
+ if (packet->udp != NULL) {
+ dport = ntohs(packet->udp->dest);
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG, "netbios udp start\n");
+
+ /*check standard NETBIOS over udp to port 137 */
+ if ((dport == 137 || 0) && packet->payload_packet_len >= 50) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+ NDPI_LOG_DEBUG, "found netbios port 137 and payload_packet_len 50\n");
+
+ if (ntohs(get_u_int16_t(packet->payload, 2)) == 0 &&
+ ntohs(get_u_int16_t(packet->payload, 4)) == 1 &&
+ ntohs(get_u_int16_t(packet->payload, 6)) == 0 &&
+ ntohs(get_u_int16_t(packet->payload, 8)) == 0 && ntohs(get_u_int16_t(packet->payload, 10)) == 0) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+ NDPI_LOG_DEBUG, "found netbios with questions = 1 and answers = 0, authority = 0 \n");
+
+ ndpi_int_netbios_add_connection(ndpi_struct, flow);
+ return;
+ }
+ if (packet->payload[2] == 0x80 &&
+ ntohs(get_u_int16_t(packet->payload, 4)) == 1 &&
+ ntohs(get_u_int16_t(packet->payload, 6)) == 0 &&
+ ntohs(get_u_int16_t(packet->payload, 8)) == 0 && ntohs(get_u_int16_t(packet->payload, 10)) == 1) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+ NDPI_LOG_DEBUG, "found netbios with questions = 1 and answers, authority, additional = 0 \n");
+
+ ndpi_int_netbios_add_connection(ndpi_struct, flow);
+ return;
+ }
+ if (ntohs(get_u_int16_t(packet->payload, 2)) == 0x4000 &&
+ ntohs(get_u_int16_t(packet->payload, 4)) == 1 &&
+ ntohs(get_u_int16_t(packet->payload, 6)) == 0 &&
+ ntohs(get_u_int16_t(packet->payload, 8)) == 0 && ntohs(get_u_int16_t(packet->payload, 10)) == 1) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+ NDPI_LOG_DEBUG, "found netbios with questions = 1 and answers = 0, authority = 0 \n");
+
+ ndpi_int_netbios_add_connection(ndpi_struct, flow);
+ return;
+ }
+ if (ntohs(get_u_int16_t(packet->payload, 2)) == 0x8400 &&
+ ntohs(get_u_int16_t(packet->payload, 4)) == 0 &&
+ ntohs(get_u_int16_t(packet->payload, 6)) == 1 &&
+ ntohs(get_u_int16_t(packet->payload, 8)) == 0 && ntohs(get_u_int16_t(packet->payload, 10)) == 0) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+ NDPI_LOG_DEBUG,
+ "found netbios with flag 8400 questions = 0 and answers = 1, authority, additional = 0 \n");
+
+ ndpi_int_netbios_add_connection(ndpi_struct, flow);
+ return;
+ }
+ if (ntohs(get_u_int16_t(packet->payload, 2)) == 0x8500 &&
+ ntohs(get_u_int16_t(packet->payload, 4)) == 0 &&
+ ntohs(get_u_int16_t(packet->payload, 6)) == 1 &&
+ ntohs(get_u_int16_t(packet->payload, 8)) == 0 && ntohs(get_u_int16_t(packet->payload, 10)) == 0) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+ NDPI_LOG_DEBUG,
+ "found netbios with flag 8500 questions = 0 and answers = 1, authority, additional = 0 \n");
+
+ ndpi_int_netbios_add_connection(ndpi_struct, flow);
+ return;
+ }
+ if (ntohs(get_u_int16_t(packet->payload, 2)) == 0x2910 &&
+ ntohs(get_u_int16_t(packet->payload, 4)) == 1 &&
+ ntohs(get_u_int16_t(packet->payload, 6)) == 0 &&
+ ntohs(get_u_int16_t(packet->payload, 8)) == 0 && ntohs(get_u_int16_t(packet->payload, 10)) == 1) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+ NDPI_LOG_DEBUG,
+ "found netbios with flag 2910, questions = 1 and answers, authority=0, additional = 1 \n");
+
+ ndpi_int_netbios_add_connection(ndpi_struct, flow);
+ return;
+ }
+ if (ntohs(get_u_int16_t(packet->payload, 2)) == 0xAD86 &&
+ ntohs(get_u_int16_t(packet->payload, 4)) == 0 &&
+ ntohs(get_u_int16_t(packet->payload, 6)) == 1 &&
+ ntohs(get_u_int16_t(packet->payload, 8)) == 0 && ntohs(get_u_int16_t(packet->payload, 10)) == 0) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+ NDPI_LOG_DEBUG,
+ "found netbios with flag ad86 questions = 0 and answers = 1, authority, additional = 0 \n");
+
+ ndpi_int_netbios_add_connection(ndpi_struct, flow);
+ return;
+ }
+ if (ntohs(get_u_int16_t(packet->payload, 2)) == 0x0110 &&
+ ntohs(get_u_int16_t(packet->payload, 4)) == 1 &&
+ ntohs(get_u_int16_t(packet->payload, 6)) == 0 &&
+ ntohs(get_u_int16_t(packet->payload, 8)) == 0 && ntohs(get_u_int16_t(packet->payload, 10)) == 0) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+ NDPI_LOG_DEBUG,
+ "found netbios with flag 0110 questions = 1 and answers = 0, authority, additional = 0 \n");
+
+ ndpi_int_netbios_add_connection(ndpi_struct, flow);
+ return;
+ }
+
+ if ((ntohs(get_u_int16_t(packet->payload, 2)) & 0xf800) == 0) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG, "possible netbios name query request\n");
+
+ if (get_u_int16_t(packet->payload, 4) == htons(1) &&
+ get_u_int16_t(packet->payload, 6) == 0 &&
+ get_u_int16_t(packet->payload, 8) == 0 && get_u_int16_t(packet->payload, 10) == 0) {
+
+ /* name is encoded as described in rfc883 */
+ u_int8_t name_length = packet->payload[12];
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+ "possible netbios name query request, one question\n");
+
+ if (packet->payload_packet_len == 12 + 1 + name_length + 1 + 2 + 2) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+ "possible netbios name query request, length matches\n");
+
+ /* null terminated? */
+ if (packet->payload[12 + name_length + 1] == 0 &&
+ get_u_int16_t(packet->payload, 12 + name_length + 2) == htons(0x0020) &&
+ get_u_int16_t(packet->payload, 12 + name_length + 4) == htons(0x0001)) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+ "found netbios name query request\n");
+ ndpi_int_netbios_add_connection(ndpi_struct, flow);
+ return;
+ }
+ }
+ }
+ } else if ((ntohs(get_u_int16_t(packet->payload, 2)) & 0xf800) == 0x8000) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+ "possible netbios name query response\n");
+
+ if (get_u_int16_t(packet->payload, 4) == 0 &&
+ get_u_int16_t(packet->payload, 6) == htons(1) &&
+ get_u_int16_t(packet->payload, 8) == 0 && get_u_int16_t(packet->payload, 10) == 0) {
+
+ /* name is encoded as described in rfc883 */
+ u_int8_t name_length = packet->payload[12];
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+ "possible netbios positive name query response, one answer\n");
+
+ if (packet->payload_packet_len >= 12 + 1 + name_length + 1 + 2 + 2) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+ "possible netbios name query response, length matches\n");
+
+ /* null terminated? */
+ if (packet->payload[12 + name_length + 1] == 0 &&
+ get_u_int16_t(packet->payload, 12 + name_length + 2) == htons(0x0020) &&
+ get_u_int16_t(packet->payload, 12 + name_length + 4) == htons(0x0001)) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+ "found netbios name query response\n");
+ ndpi_int_netbios_add_connection(ndpi_struct, flow);
+ return;
+ }
+ }
+ } else if (get_u_int16_t(packet->payload, 4) == 0 &&
+ get_u_int16_t(packet->payload, 6) == 0 &&
+ get_u_int16_t(packet->payload, 8) == 0 && get_u_int16_t(packet->payload, 10) == 0) {
+
+ /* name is encoded as described in rfc883 */
+ u_int8_t name_length = packet->payload[12];
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+ "possible netbios negative name query response, one answer\n");
+
+ if (packet->payload_packet_len >= 12 + 1 + name_length + 1 + 2 + 2) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+ "possible netbios name query response, length matches\n");
+
+ /* null terminated? */
+ if (packet->payload[12 + name_length + 1] == 0 &&
+ get_u_int16_t(packet->payload, 12 + name_length + 2) == htons(0x000A) &&
+ get_u_int16_t(packet->payload, 12 + name_length + 4) == htons(0x0001)) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+ "found netbios name query response\n");
+ ndpi_int_netbios_add_connection(ndpi_struct, flow);
+ return;
+ }
+ }
+ } else if (get_u_int16_t(packet->payload, 4) == 0 &&
+ get_u_int16_t(packet->payload, 6) == 0 &&
+ get_u_int16_t(packet->payload, 8) == htons(1) && get_u_int16_t(packet->payload, 10) == htons(1)) {
+
+ /* name is encoded as described in rfc883 */
+ u_int8_t name_length = packet->payload[12];
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+ "possible netbios redirect name query response, one answer\n");
+
+ if (packet->payload_packet_len >= 12 + 1 + name_length + 1 + 2 + 2) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+ "possible netbios name query response, length matches\n");
+
+ /* null terminated? */
+ if (packet->payload[12 + name_length + 1] == 0 &&
+ get_u_int16_t(packet->payload, 12 + name_length + 2) == htons(0x0002) &&
+ get_u_int16_t(packet->payload, 12 + name_length + 4) == htons(0x0001)) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG,
+ "found netbios name query response\n");
+ ndpi_int_netbios_add_connection(ndpi_struct, flow);
+ return;
+ }
+ }
+ }
+ }
+ /* TODO: extend according to rfc1002 */
+ }
+
+ /*check standard NETBIOS over udp to port 138 */
+
+ /*netbios header token from http://www.protocolbase.net/protocols/protocol_NBDGM.php */
+
+ if ((dport == 138) &&
+ packet->payload_packet_len >= 14 &&
+ ntohs(get_u_int16_t(packet->payload, 10)) == packet->payload_packet_len - 14) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+ NDPI_LOG_DEBUG, "found netbios port 138 and payload length >= 112 \n");
+
+ if (packet->payload[0] >= 0x11 && packet->payload[0] <= 0x16) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+ NDPI_LOG_DEBUG, "found netbios with MSG-type 0x11,0x12,0x13,0x14,0x15 or 0x16\n");
+
+ if (ntohl(get_u_int32_t(packet->payload, 4)) == ntohl(packet->iph->saddr)) {
+ char name[32];
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+ NDPI_LOG_DEBUG, "found netbios with checked ip-address.\n");
+
+ if(netbios_name_interpret((char*)&packet->payload[14], name, sizeof(name)) > 0)
+ snprintf((char*)flow->host_server_name, sizeof(flow->host_server_name), "%s", name);
+
+ ndpi_int_netbios_add_connection(ndpi_struct, flow);
+ return;
+ }
+ }
+ }
+ }
+
+ if (packet->tcp != NULL) {
+ dport = ntohs(packet->tcp->dest);
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG, "netbios tcp start\n");
+
+ /* destination port must be 139 */
+ if (dport == 139) {
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG, "found netbios with destination port 139\n");
+
+ /* payload_packet_len must be 72 */
+ if (packet->payload_packet_len == 72) {
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+ NDPI_LOG_DEBUG, "found netbios with payload_packen_len = 72. \n");
+
+ if (packet->payload[0] == 0x81 && packet->payload[1] == 0 && ntohs(get_u_int16_t(packet->payload, 2)) == 68) {
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct,
+ NDPI_LOG_DEBUG,
+ "found netbios with session request = 81, flags=0 and length od following bytes = 68. \n");
+
+ ndpi_int_netbios_add_connection(ndpi_struct, flow);
+ return;
+ }
+ }
+ }
+
+ }
+
+ NDPI_LOG(NDPI_PROTOCOL_NETBIOS, ndpi_struct, NDPI_LOG_DEBUG, "exclude netbios\n");
+ NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_NETBIOS);
+
+}
+#endif
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