1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
/*
* rdp.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_RDP
#define RDP_PORT 3389
#include "ndpi_api.h"
static void ndpi_int_rdp_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow) {
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_RDP, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
void ndpi_search_rdp(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 RDP\n");
if (packet->tcp != NULL) {
if (packet->payload_packet_len > 10
&& get_u_int8_t(packet->payload, 0) > 0
&& get_u_int8_t(packet->payload, 0) < 4 && get_u_int16_t(packet->payload, 2) == ntohs(packet->payload_packet_len)
&& get_u_int8_t(packet->payload, 4) == packet->payload_packet_len - 5
&& get_u_int8_t(packet->payload, 5) == 0xe0
&& get_u_int16_t(packet->payload, 6) == 0 && get_u_int16_t(packet->payload, 8) == 0 && get_u_int8_t(packet->payload, 10) == 0) {
NDPI_LOG_INFO(ndpi_struct, "found RDP\n");
rdp_found:
ndpi_int_rdp_add_connection(ndpi_struct, flow);
ndpi_set_risk(ndpi_struct, flow, NDPI_DESKTOP_OR_FILE_SHARING_SESSION); /* Remote assistance */
return;
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
} else if(packet->udp != NULL) {
u_int16_t s_port = ntohs(packet->udp->source);
u_int16_t d_port = ntohs(packet->udp->dest);
if((packet->payload_packet_len >= 10) && ((s_port == RDP_PORT) || (d_port == RDP_PORT))) {
if(s_port == RDP_PORT) {
/* Server -> Client */
if(flow->l4.udp.rdp_from_srv_pkts == 0)
memcpy(flow->l4.udp.rdp_from_srv, packet->payload, 3), flow->l4.udp.rdp_from_srv_pkts = 1;
else {
if(memcmp(flow->l4.udp.rdp_from_srv, packet->payload, 3) != 0)
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
else {
flow->l4.udp.rdp_from_srv_pkts = 2 /* stage 2 */;
if(flow->l4.udp.rdp_to_srv_pkts == 2)
goto rdp_found;
}
}
} else {
/* Client -> Server */
if(flow->l4.udp.rdp_to_srv_pkts == 0)
memcpy(flow->l4.udp.rdp_to_srv, packet->payload, 3), flow->l4.udp.rdp_to_srv_pkts = 1;
else {
if(memcmp(flow->l4.udp.rdp_to_srv, packet->payload, 3) != 0)
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
else {
flow->l4.udp.rdp_to_srv_pkts = 2 /* stage 2 */;
if(flow->l4.udp.rdp_from_srv_pkts == 2)
goto rdp_found;
}
}
}
} else
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
}
void init_rdp_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("RDP", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_RDP,
ndpi_search_rdp,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
|