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
121
122
123
124
125
126
|
/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program 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 General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
#include "xline.h"
/* $ModDesc: Throttles the connections of IP ranges who try to connect flood. */
class ModuleConnectBan : public Module
{
private:
clonemap connects;
unsigned int threshold;
unsigned int banduration;
unsigned int ipv4_cidr;
unsigned int ipv6_cidr;
public:
void init()
{
Implementation eventlist[] = { I_OnSetUserIP, I_OnGarbageCollect, I_OnRehash };
ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
OnRehash(NULL);
}
virtual ~ModuleConnectBan()
{
}
virtual Version GetVersion()
{
return Version("Throttles the connections of IP ranges who try to connect flood.", VF_VENDOR);
}
virtual void OnRehash(User* user)
{
ConfigTag* tag = ServerInstance->Config->ConfValue("connectban");
ipv4_cidr = tag->getInt("ipv4cidr", 32);
if (ipv4_cidr == 0)
ipv4_cidr = 32;
ipv6_cidr = tag->getInt("ipv6cidr", 128);
if (ipv6_cidr == 0)
ipv6_cidr = 128;
threshold = tag->getInt("threshold", 10);
if (threshold == 0)
threshold = 10;
banduration = ServerInstance->Duration(tag->getString("duration", "10m"));
if (banduration == 0)
banduration = 10*60;
}
virtual void OnSetUserIP(LocalUser* u)
{
if (u->exempt)
return;
int range = 32;
clonemap::iterator i;
switch (u->client_sa.sa.sa_family)
{
case AF_INET6:
range = ipv6_cidr;
break;
case AF_INET:
range = ipv4_cidr;
break;
}
irc::sockets::cidr_mask mask(u->client_sa, range);
i = connects.find(mask);
if (i != connects.end())
{
i->second++;
if (i->second >= threshold)
{
// Create zline for set duration.
ZLine* zl = new ZLine(ServerInstance->Time(), banduration, ServerInstance->Config->ServerName, "Your IP range has been attempting to connect too many times in too short a duration. Wait a while, and you will be able to connect.", mask.str());
if (ServerInstance->XLines->AddLine(zl,NULL))
ServerInstance->XLines->ApplyLines();
else
delete zl;
std::string maskstr = mask.str();
std::string timestr = ServerInstance->TimeString(zl->expiry);
ServerInstance->SNO->WriteGlobalSno('x',"Module m_connectban added Z:line on *@%s to expire on %s: Connect flooding",
maskstr.c_str(), timestr.c_str());
ServerInstance->SNO->WriteGlobalSno('a', "Connect flooding from IP range %s (%d)", maskstr.c_str(), threshold);
connects.erase(i);
}
}
else
{
connects[mask] = 1;
}
}
virtual void OnGarbageCollect()
{
ServerInstance->Logs->Log("m_connectban",DEBUG, "Clearing map.");
connects.clear();
}
};
MODULE_INIT(ModuleConnectBan)
|
