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/*
* Anope IRC Services
*
* Copyright (C) 2013-2016 Anope Team <team@anope.org>
*
* This file is part of Anope. Anope 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 see <http://www.gnu.org/licenses/>.
*/
#include "module.h"
#include "modules/dns.h"
using namespace DNS;
struct Blacklist
{
struct Reply
{
int code;
Anope::string reason;
bool allow_account;
Reply() : code(0), allow_account(false) { }
};
Anope::string name;
time_t bantime;
Anope::string reason;
std::vector<Reply> replies;
Blacklist() : bantime(0) { }
Reply *Find(int code)
{
for (unsigned int i = 0; i < replies.size(); ++i)
if (replies[i].code == code)
return &replies[i];
return NULL;
}
};
class DNSBLResolver : public Request
{
ServiceReference<XLineManager> &akills;
Reference<User> user;
Blacklist blacklist;
bool add_to_akill;
public:
DNSBLResolver(ServiceReference<XLineManager> &a, Module *c, DNS::Manager *manager, User *u, const Blacklist &b, const Anope::string &host, bool add_akill) : Request(manager, c, host, QUERY_A, true), akills(a), user(u), blacklist(b), add_to_akill(add_akill) { }
void OnLookupComplete(const Query *record) override
{
if (!user || user->Quitting())
return;
const ResourceRecord &ans_record = record->answers[0];
// Replies should be in 127.0.0.0/24
if (ans_record.rdata.find("127.0.0.") != 0)
return;
sockaddrs sresult;
sresult.pton(AF_INET, ans_record.rdata);
int result = sresult.sa4.sin_addr.s_addr >> 24;
Blacklist::Reply *reply = blacklist.Find(result);
if (!blacklist.replies.empty() && !reply)
return;
if (reply && reply->allow_account && user->Account())
return;
Anope::string reason = this->blacklist.reason, addr = user->ip.addr();
reason = reason.replace_all_cs("%n", user->nick);
reason = reason.replace_all_cs("%u", user->GetIdent());
reason = reason.replace_all_cs("%g", user->realname);
reason = reason.replace_all_cs("%h", user->host);
reason = reason.replace_all_cs("%i", addr);
reason = reason.replace_all_cs("%r", reply ? reply->reason : "");
reason = reason.replace_all_cs("%N", Config->GetBlock("networkinfo")->Get<Anope::string>("networkname"));
ServiceBot *OperServ = Config->GetClient("OperServ");
creator->logger.Category("dnsbl").Bot(OperServ).Log(_("{0} ({1}) appears in {2}"), user->GetMask(), addr, this->blacklist.name);
XLine *x = Serialize::New<XLine *>();
x->SetMask("*@" + addr);
x->SetBy(OperServ ? OperServ->nick : "m_dnsbl");
x->SetCreated(Anope::CurTime);
x->SetExpires(Anope::CurTime + this->blacklist.bantime);
x->SetReason(reason);
x->SetID(XLineManager::GenerateUID());
if (this->add_to_akill && akills)
{
akills->AddXLine(x);
akills->Send(NULL, x);
}
else
{
IRCD->Send<messages::Akill>(nullptr, x);
delete x;
}
}
};
class ModuleDNSBL : public Module
, public EventHook<Event::UserConnect>
{
ServiceReference<DNS::Manager> manager;
std::vector<Blacklist> blacklists;
std::set<Anope::string> exempts;
bool check_on_connect;
bool check_on_netburst;
bool add_to_akill;
ServiceReference<XLineManager> akill;
public:
ModuleDNSBL(const Anope::string &modname, const Anope::string &creator) : Module(modname, creator, VENDOR | EXTRA)
, EventHook<Event::UserConnect>(this)
, akill("sgline")
{
}
void OnReload(Configuration::Conf *conf) override
{
Configuration::Block *block = conf->GetModule(this);
this->check_on_connect = block->Get<bool>("check_on_connect");
this->check_on_netburst = block->Get<bool>("check_on_netburst");
this->add_to_akill = block->Get<bool>("add_to_akill", "yes");
this->blacklists.clear();
for (int i = 0; i < block->CountBlock("blacklist"); ++i)
{
Configuration::Block *bl = block->GetBlock("blacklist", i);
Blacklist blacklist;
blacklist.name = bl->Get<Anope::string>("name");
if (blacklist.name.empty())
continue;
blacklist.bantime = bl->Get<time_t>("time", "4h");
blacklist.reason = bl->Get<Anope::string>("reason");
for (int j = 0; j < bl->CountBlock("reply"); ++j)
{
Configuration::Block *reply = bl->GetBlock("reply", j);
Blacklist::Reply r;
r.code = reply->Get<int>("code");
r.reason = reply->Get<Anope::string>("reason");
r.allow_account = reply->Get<bool>("allow_account");
blacklist.replies.push_back(r);
}
this->blacklists.push_back(blacklist);
}
this->exempts.clear();
for (int i = 0; i < block->CountBlock("exempt"); ++i)
this->exempts.insert(block->Get<Anope::string>("ip"));
}
void OnUserConnect(User *user, bool &exempt) override
{
if (exempt || user->Quitting() || (!this->check_on_connect && !Me->IsSynced()) || !manager)
return;
if (!this->check_on_netburst && !user->server->IsSynced())
return;
/* At this time we only support IPv4 */
if (!user->ip.valid() || user->ip.sa.sa_family != AF_INET)
/* User doesn't have a valid IPv4 IP (ipv6/spoof/etc) */
return;
if (this->exempts.count(user->ip.addr()))
return;
const unsigned long &ip = user->ip.sa4.sin_addr.s_addr;
unsigned long reverse_ip = (ip << 24) | ((ip & 0xFF00) << 8) | ((ip & 0xFF0000) >> 8) | (ip >> 24);
sockaddrs reverse = user->ip;
reverse.sa4.sin_addr.s_addr = reverse_ip;
for (unsigned i = 0; i < this->blacklists.size(); ++i)
{
const Blacklist &b = this->blacklists[i];
Anope::string dnsbl_host = reverse.addr() + "." + b.name;
DNSBLResolver *res = NULL;
try
{
res = new DNSBLResolver(akill, this, manager, user, b, dnsbl_host, this->add_to_akill);
manager->Process(res);
}
catch (const SocketException &ex)
{
delete res;
logger.Log(ex.GetReason());
}
}
}
};
MODULE_INIT(ModuleDNSBL)
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