src/modules/m_connectban.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
   5  *
   6  * This file is part of InspIRCd.  InspIRCd is free software: you can
   7  * redistribute it and/or modify it under the terms of the GNU General Public
   8  * License as published by the Free Software Foundation, version 2.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  12  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  13  * details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19
  20 #include "inspircd.h"
  21 #include "xline.h"
  22
  23 class ModuleConnectBan : public Module
  24 {
  25         clonemap connects;
  26         unsigned int threshold;
  27         unsigned int banduration;
  28         unsigned int ipv4_cidr;
  29         unsigned int ipv6_cidr;
  30
  31  public:
  32         Version GetVersion() CXX11_OVERRIDE
  33         {
  34                 return Version("Throttles the connections of IP ranges who try to connect flood.", VF_VENDOR);
  35         }
  36
  37         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
  38         {
  39                 ConfigTag* tag = ServerInstance->Config->ConfValue("connectban");
  40
  41                 ipv4_cidr = tag->getInt("ipv4cidr", 32, 1, 32);
  42                 ipv6_cidr = tag->getInt("ipv6cidr", 128, 1, 128);
  43                 threshold = tag->getInt("threshold", 10, 1);
  44                 banduration = tag->getDuration("duration", 10*60, 1);
  45         }
  46
  47         void OnSetUserIP(LocalUser* u) CXX11_OVERRIDE
  48         {
  49                 if (u->exempt)
  50                         return;
  51
  52                 int range = 32;
  53                 clonemap::iterator i;
  54
  55                 switch (u->client_sa.sa.sa_family)
  56                 {
  57                         case AF_INET6:
  58                                 range = ipv6_cidr;
  59                         break;
  60                         case AF_INET:
  61                                 range = ipv4_cidr;
  62                         break;
  63                 }
  64
  65                 irc::sockets::cidr_mask mask(u->client_sa, range);
  66                 i = connects.find(mask);
  67
  68                 if (i != connects.end())
  69                 {
  70                         i->second++;
  71
  72                         if (i->second >= threshold)
  73                         {
  74                                 // Create zline for set duration.
  75                                 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());
  76                                 if (!ServerInstance->XLines->AddLine(zl, NULL))
  77                                 {
  78                                         delete zl;
  79                                         return;
  80                                 }
  81                                 ServerInstance->XLines->ApplyLines();
  82                                 std::string maskstr = mask.str();
  83                                 std::string timestr = InspIRCd::TimeString(zl->expiry);
  84                                 ServerInstance->SNO->WriteGlobalSno('x',"Module m_connectban added Z:line on *@%s to expire on %s: Connect flooding",
  85                                         maskstr.c_str(), timestr.c_str());
  86                                 ServerInstance->SNO->WriteGlobalSno('a', "Connect flooding from IP range %s (%d)", maskstr.c_str(), threshold);
  87                                 connects.erase(i);
  88                         }
  89                 }
  90                 else
  91                 {
  92                         connects[mask] = 1;
  93                 }
  94         }
  95
  96         void OnGarbageCollect()
  97         {
  98                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Clearing map.");
  99                 connects.clear();
 100         }
 101 };
 102
 103 MODULE_INIT(ModuleConnectBan)