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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2019 Matt Schatz <genius3000@g3k.solutions>
* Copyright (C) 2014 Googolplexed <googol@googolplexed.net>
* Copyright (C) 2013, 2017-2022 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2012-2014 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012, 2019 Robby <robby@chatbelgie.be>
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2008, 2010 Craig Edwards <brain@inspircd.org>
* 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"
#include "modules/server.h"
#include "modules/webirc.h"
class ModuleConnectBan final
: public Module
, public ServerProtocol::LinkEventListener
, public WebIRC::EventListener
{
private:
typedef std::map<irc::sockets::cidr_mask, unsigned int> ConnectMap;
ConnectMap connects;
unsigned long threshold;
unsigned long banduration;
unsigned int ipv4_cidr;
unsigned int ipv6_cidr;
unsigned long bootwait;
unsigned long splitwait;
time_t ignoreuntil;
std::string banmessage;
unsigned char GetRange(LocalUser* user)
{
int family = user->client_sa.family();
switch (family)
{
case AF_INET:
return ipv4_cidr;
case AF_INET6:
return ipv6_cidr;
case AF_UNIX:
// Ranges for UNIX sockets are ignored entirely.
return 0;
}
// If we have reached this point then we have encountered a bug.
ServerInstance->Logs.Debug(MODNAME, "BUG: ModuleConnectBan::GetRange(): socket type %d is unknown!", family);
return 0;
}
static bool IsExempt(LocalUser* user)
{
// E-lined and already banned users shouldn't be hit.
if (user->exempt || user->quitting)
return true;
// Users in an exempt class shouldn't be hit.
return user->GetClass() && !user->GetClass()->config->getBool("useconnectban", true);
}
public:
// Stop GCC warnings about the deprecated OnServerSplit event.
using ServerProtocol::LinkEventListener::OnServerSplit;
ModuleConnectBan()
: Module(VF_VENDOR, "Z-lines IP addresses which make excessive connections to the server.")
, ServerProtocol::LinkEventListener(this)
, WebIRC::EventListener(this)
, ignoreuntil(0)
{
}
void Prioritize() override
{
Module* corexline = ServerInstance->Modules.Find("core_xline");
ServerInstance->Modules.SetPriority(this, I_OnSetUserIP, PRIORITY_AFTER, corexline);
}
void ReadConfig(ConfigStatus& status) override
{
auto tag = ServerInstance->Config->ConfValue("connectban");
ipv4_cidr = static_cast<unsigned int>(tag->getUInt("ipv4cidr", ServerInstance->Config->c_ipv4_range, 1, 32));
ipv6_cidr = static_cast<unsigned int>(tag->getUInt("ipv6cidr", ServerInstance->Config->c_ipv6_range, 1, 128));
threshold = tag->getUInt("threshold", 10, 1);
bootwait = tag->getDuration("bootwait", 60*2);
splitwait = tag->getDuration("splitwait", 60*2);
banduration = tag->getDuration("banduration", 6*60*60, 1);
banmessage = tag->getString("banmessage", "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.");
if (status.initial)
ignoreuntil = ServerInstance->Time() + bootwait;
}
void OnWebIRCAuth(LocalUser* user, const WebIRC::FlagMap* flags) override
{
if (IsExempt(user))
return;
// HACK: Lower the connection attempts for the gateway IP address. The user
// will be rechecked for connect spamming shortly after when their IP address
// is changed and OnSetUserIP is called.
irc::sockets::cidr_mask mask(user->client_sa, GetRange(user));
ConnectMap::iterator iter = connects.find(mask);
if (iter != connects.end() && iter->second)
iter->second--;
}
void OnServerSplit(const Server* server, bool error) override
{
if (splitwait)
ignoreuntil = std::max<time_t>(ignoreuntil, ServerInstance->Time() + splitwait);
}
void OnSetUserIP(LocalUser* u) override
{
if (IsExempt(u) || ignoreuntil > ServerInstance->Time())
return;
irc::sockets::cidr_mask mask(u->client_sa, GetRange(u));
ConnectMap::iterator i = connects.find(mask);
if (i != connects.end())
{
i->second++;
if (i->second >= threshold)
{
// Create Z-line for set duration.
ZLine* zl = new ZLine(ServerInstance->Time(), banduration, MODNAME "@" + ServerInstance->Config->ServerName, banmessage, mask.str());
if (!ServerInstance->XLines->AddLine(zl, NULL))
{
delete zl;
return;
}
std::string maskstr = mask.str();
ServerInstance->SNO.WriteToSnoMask('x', "%s added a timed Z-line on %s, expires in %s (on %s): %s",
zl->source.c_str(), maskstr.c_str(), InspIRCd::DurationString(zl->duration).c_str(),
InspIRCd::TimeString(zl->expiry).c_str(), zl->reason.c_str());
ServerInstance->SNO.WriteGlobalSno('a', "Connect flooding from IP range %s (%lu)", maskstr.c_str(), threshold);
connects.erase(i);
ServerInstance->XLines->ApplyLines();
}
}
else
{
connects[mask] = 1;
}
}
void OnGarbageCollect() override
{
ServerInstance->Logs.Debug(MODNAME, "Clearing map.");
connects.clear();
}
};
MODULE_INIT(ModuleConnectBan)
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