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/*
* ssh.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_protocol_ids.h"
#ifdef NDPI_PROTOCOL_SSH
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_SSH
#include "ndpi_api.h"
static void ndpi_int_ssh_add_connection(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow){
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_SSH, NDPI_PROTOCOL_UNKNOWN);
}
static void ndpi_ssh_zap_cr(char *str, int len) {
len--;
while(len > 0) {
if((str[len] == '\n') || (str[len] == '\r')) {
str[len] = '\0';
len--;
} else
break;
}
}
void ndpi_search_ssh_tcp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
if (flow->l4.tcp.ssh_stage == 0) {
if (packet->payload_packet_len > 7 && packet->payload_packet_len < 100
&& memcmp(packet->payload, "SSH-", 4) == 0) {
int len = ndpi_min(sizeof(flow->protos.ssh.client_signature)-1, packet->payload_packet_len);
strncpy(flow->protos.ssh.client_signature, (const char *)packet->payload, len);
flow->protos.ssh.client_signature[len] = '\0';
ndpi_ssh_zap_cr(flow->protos.ssh.client_signature, len);
NDPI_LOG_DBG2(ndpi_struct, "ssh stage 0 passed\n");
flow->l4.tcp.ssh_stage = 1 + packet->packet_direction;
return;
}
} else if (flow->l4.tcp.ssh_stage == (2 - packet->packet_direction)) {
if (packet->payload_packet_len > 7 && packet->payload_packet_len < 100
&& memcmp(packet->payload, "SSH-", 4) == 0) {
int len = ndpi_min(sizeof(flow->protos.ssh.server_signature)-1, packet->payload_packet_len);
strncpy(flow->protos.ssh.server_signature, (const char *)packet->payload, len);
flow->protos.ssh.server_signature[len] = '\0';
ndpi_ssh_zap_cr(flow->protos.ssh.server_signature, len);
NDPI_LOG_INFO(ndpi_struct, "found ssh\n");
ndpi_int_ssh_add_connection(ndpi_struct, flow);
return;
}
}
NDPI_LOG_DBG(ndpi_struct, "excluding ssh at stage %d\n", flow->l4.tcp.ssh_stage);
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_SSH);
}
void init_ssh_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("SSH", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_SSH,
ndpi_search_ssh_tcp,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
#endif
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