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/*
* ldap.c
*
* Copyright (C) 2009-11 - ipoque GmbH
* Copyright (C) 2011-22 - 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_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_LDAP
#include "ndpi_api.h"
static void ndpi_int_ldap_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_LDAP, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
void ndpi_search_ldap(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
NDPI_LOG_DBG(ndpi_struct, "search ldap\n");
if (packet->payload_packet_len >= 14 && packet->payload[0] == 0x30) {
// simple type
if (packet->payload[1] == 0x0c && packet->payload_packet_len == 14 &&
packet->payload[packet->payload_packet_len - 1] == 0x00 && packet->payload[2] == 0x02) {
if (packet->payload[3] == 0x01 &&
(packet->payload[5] == 0x60 || packet->payload[5] == 0x61) && packet->payload[6] == 0x07) {
NDPI_LOG_INFO(ndpi_struct, "found ldap simple type 1\n");
ndpi_int_ldap_add_connection(ndpi_struct, flow);
return;
}
if (packet->payload[3] == 0x02 &&
(packet->payload[6] == 0x60 || packet->payload[6] == 0x61) && packet->payload[7] == 0x07) {
NDPI_LOG_INFO(ndpi_struct, "found ldap simple type 2\n");
ndpi_int_ldap_add_connection(ndpi_struct, flow);
return;
}
}
// normal type
if (packet->payload[1] == 0x84 &&
packet->payload[2] == 0x00 && packet->payload[3] == 0x00 && packet->payload[6] == 0x02) {
if (packet->payload[7] == 0x01 &&
(packet->payload[9] == 0x60 || packet->payload[9] == 0x61 || packet->payload[9] == 0x63 ||
packet->payload[9] == 0x64) && packet->payload[10] == 0x84) {
NDPI_LOG_INFO(ndpi_struct, "found ldap type 1\n");
ndpi_int_ldap_add_connection(ndpi_struct, flow);
return;
}
if (packet->payload[7] == 0x02 &&
(packet->payload[10] == 0x60 || packet->payload[10] == 0x61 || packet->payload[10] == 0x63 ||
packet->payload[10] == 0x64) && packet->payload[11] == 0x84) {
NDPI_LOG_INFO(ndpi_struct, "found ldap type 2\n");
ndpi_int_ldap_add_connection(ndpi_struct, flow);
return;
}
if (packet->payload[7] == 0x03 &&
(packet->payload[11] == 0x60 || packet->payload[11] == 0x61 || packet->payload[11] == 0x63 ||
packet->payload[11] == 0x64 || packet->payload[11] == 0x65) && packet->payload[12] == 0x84) {
NDPI_LOG_INFO(ndpi_struct, "found ldap type 3\n");
ndpi_int_ldap_add_connection(ndpi_struct, flow);
return;
}
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_ldap_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("LDAP", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_LDAP,
ndpi_search_ldap,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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