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/*
* smb.c
*
* Copyright (C) 2016-22 - 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_SMBV23
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_search_smb_tcp(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 SMB\n");
/* Check connection over TCP */
if(packet->tcp) {
u_int16_t fourfourfive = htons(445);
if(((packet->tcp->dest == fourfourfive) || (packet->tcp->source == fourfourfive))
&& packet->payload_packet_len > (32 + 4 + 4)
&& packet->payload[0] == 0x00) {
u_int32_t length;
length = (packet->payload[1] << 16) + (packet->payload[2] << 8) + packet->payload[3];
/* If the message is split into multiple TCP segments, let's hope that
the first message we receive is the first segment */
if(length >= (uint32_t)packet->payload_packet_len - 4) {
u_int8_t smbv1[] = { 0xff, 0x53, 0x4d, 0x42 };
u_int8_t smbv2[] = { 0xfe, 0x53, 0x4d, 0x42 };
if(memcmp(&packet->payload[4], smbv1, sizeof(smbv1)) == 0) {
if(packet->payload[8] != 0x72) /* Skip Negotiate request */ {
NDPI_LOG_INFO(ndpi_struct, "found SMBv1\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_SMBV1, NDPI_PROTOCOL_NETBIOS, NDPI_CONFIDENCE_DPI);
ndpi_set_risk(flow, NDPI_SMB_INSECURE_VERSION, "Found SMBv1");
}
return;
} else if(memcmp(&packet->payload[4], smbv2, sizeof(smbv2)) == 0) {
NDPI_LOG_INFO(ndpi_struct, "found SMBv23\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_SMBV23, NDPI_PROTOCOL_NETBIOS, NDPI_CONFIDENCE_DPI);
return;
}
}
}
}
NDPI_EXCLUDE_PROTO_EXT(ndpi_struct, flow, NDPI_PROTOCOL_SMBV1);
NDPI_EXCLUDE_PROTO_EXT(ndpi_struct, flow, NDPI_PROTOCOL_SMBV23);
}
void init_smb_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("SMB", ndpi_struct, *id,
NDPI_PROTOCOL_SMBV23,
ndpi_search_smb_tcp,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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