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
111
112
113
114
115
116
117
118
119
120
|
/*
* postgres.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_POSTGRES
static void ndpi_int_postgres_add_connection(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_POSTGRES/* , NDPI_REAL_PROTOCOL */);
}
void ndpi_search_postgres_tcp(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 size;
if (flow->l4.tcp.postgres_stage == 0) {
//SSL
if (packet->payload_packet_len > 7 &&
packet->payload[4] == 0x04 &&
packet->payload[5] == 0xd2 &&
packet->payload[6] == 0x16 &&
packet->payload[7] == 0x2f && ntohl(get_u_int32_t(packet->payload, 0)) == packet->payload_packet_len) {
flow->l4.tcp.postgres_stage = 1 + packet->packet_direction;
return;
}
//no SSL
if (packet->payload_packet_len > 7 &&
//protocol version number - to be updated
ntohl(get_u_int32_t(packet->payload, 4)) < 0x00040000 &&
ntohl(get_u_int32_t(packet->payload, 0)) == packet->payload_packet_len) {
flow->l4.tcp.postgres_stage = 3 + packet->packet_direction;
return;
}
} else {
if (flow->l4.tcp.postgres_stage == 2 - packet->packet_direction) {
//SSL accepted
if (packet->payload_packet_len == 1 && packet->payload[0] == 'S') {
NDPI_LOG(NDPI_PROTOCOL_POSTGRES, ndpi_struct, NDPI_LOG_DEBUG, "PostgreSQL detected, SSL accepted.\n");
ndpi_int_postgres_add_connection(ndpi_struct, flow);
return;
}
//SSL denied
if (packet->payload_packet_len == 1 && packet->payload[0] == 'N') {
NDPI_LOG(NDPI_PROTOCOL_POSTGRES, ndpi_struct, NDPI_LOG_DEBUG, "PostgreSQL detected, SSL denied.\n");
ndpi_int_postgres_add_connection(ndpi_struct, flow);
return;
}
}
//no SSL
if (flow->l4.tcp.postgres_stage == 4 - packet->packet_direction)
if (packet->payload_packet_len > 8 &&
ntohl(get_u_int32_t(packet->payload, 5)) < 10 &&
ntohl(get_u_int32_t(packet->payload, 1)) == packet->payload_packet_len - 1 && packet->payload[0] == 0x52) {
NDPI_LOG(NDPI_PROTOCOL_POSTGRES, ndpi_struct, NDPI_LOG_DEBUG, "PostgreSQL detected, no SSL.\n");
ndpi_int_postgres_add_connection(ndpi_struct, flow);
return;
}
if (flow->l4.tcp.postgres_stage == 6
&& ntohl(get_u_int32_t(packet->payload, 1)) == packet->payload_packet_len - 1 && packet->payload[0] == 'p') {
NDPI_LOG(NDPI_PROTOCOL_POSTGRES, ndpi_struct, NDPI_LOG_DEBUG, "found postgres asymmetrically.\n");
ndpi_int_postgres_add_connection(ndpi_struct, flow);
return;
}
if (flow->l4.tcp.postgres_stage == 5 && packet->payload[0] == 'R') {
if (ntohl(get_u_int32_t(packet->payload, 1)) == packet->payload_packet_len - 1) {
NDPI_LOG(NDPI_PROTOCOL_POSTGRES, ndpi_struct, NDPI_LOG_DEBUG, "found postgres asymmetrically.\n");
ndpi_int_postgres_add_connection(ndpi_struct, flow);
return;
}
size = (u_int16_t)ntohl(get_u_int32_t(packet->payload, 1)) + 1;
if (packet->payload[size - 1] == 'S') {
if ((size + get_u_int32_t(packet->payload, (size + 1))) == packet->payload_packet_len) {
NDPI_LOG(NDPI_PROTOCOL_POSTGRES, ndpi_struct, NDPI_LOG_DEBUG, "found postgres asymmetrically.\n");
ndpi_int_postgres_add_connection(ndpi_struct, flow);
return;
}
}
size += get_u_int32_t(packet->payload, (size + 1)) + 1;
if (packet->payload[size - 1] == 'S') {
NDPI_LOG(NDPI_PROTOCOL_POSTGRES, ndpi_struct, NDPI_LOG_DEBUG, "found postgres asymmetrically.\n");
ndpi_int_postgres_add_connection(ndpi_struct, flow);
return;
}
}
}
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_POSTGRES);
}
#endif
|