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/*
*
* (C) 2003-2024 Anope Team
* Contact us at team@anope.org
*
* Please read COPYING and README for further details.
*/
#include "module.h"
#include "modules/dns.h"
using namespace DNS;
static ServiceReference<XLineManager> akills("XLineManager", "xlinemanager/sgline");
static ServiceReference<Manager> dnsmanager("DNS::Manager", "dns/manager");
struct Blacklist final
{
struct Reply final
{
int code = 0;
Anope::string reason;
bool allow_account = false;
Reply() = default;
};
Anope::string name;
time_t bantime = 0;
Anope::string reason;
std::vector<Reply> replies;
const Reply *Find(int code)
{
for (const auto &reply : replies)
if (reply.code == code)
return &reply;
return NULL;
}
};
class DNSBLResolver final
: public Request
{
Reference<User> user;
Blacklist blacklist;
bool add_to_akill;
public:
DNSBLResolver(Module *c, User *u, const Blacklist &b, const Anope::string &host, bool add_akill) : Request(dnsmanager, c, host, QUERY_A, true), 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 127.0.0.0/8
if (ans_record.rdata.find("127.") != 0)
return;
sockaddrs sresult;
sresult.pton(AF_INET, ans_record.rdata);
int result = sresult.sa4.sin_addr.s_addr >> 24;
const 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<const Anope::string>("networkname"));
BotInfo *OperServ = Config->GetClient("OperServ");
Log(creator, "dnsbl", OperServ) << user->GetMask() << " (" << addr << ") appears in " << this->blacklist.name;
auto *x = new XLine("*@" + addr, OperServ ? OperServ->nick : "dnsbl", Anope::CurTime + this->blacklist.bantime, reason, XLineManager::GenerateUID());
if (this->add_to_akill && akills)
{
akills->AddXLine(x);
akills->Send(NULL, x);
}
else
{
IRCD->SendAkill(NULL, x);
delete x;
}
}
};
class ModuleDNSBL final
: public Module
{
std::vector<Blacklist> blacklists;
std::set<cidr> exempts;
bool check_on_connect;
bool check_on_netburst;
bool add_to_akill;
public:
ModuleDNSBL(const Anope::string &modname, const Anope::string &creator) : Module(modname, creator, VENDOR | EXTRA)
{
}
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)
{
Configuration::Block *bl = block->GetBlock("exempt", i);
this->exempts.insert(bl->Get<Anope::string>("ip"));
}
}
void OnUserConnect(User *user, bool &exempt) override
{
if (exempt || user->Quitting() || (!this->check_on_connect && !Me->IsSynced()) || !dnsmanager)
return;
if (!this->check_on_netburst && !user->server->IsSynced())
return;
if (!user->ip.valid())
/* User doesn't have a valid IP (spoof/etc) */
return;
if (this->blacklists.empty())
return;
if (this->exempts.count(user->ip.addr()))
{
Log(LOG_DEBUG) << "User " << user->nick << " is exempt from dnsbl check - ip: " << user->ip.addr();
return;
}
Anope::string reverse = user->ip.reverse();
for (const auto &b : this->blacklists)
{
Anope::string dnsbl_host = reverse + "." + b.name;
DNSBLResolver *res = NULL;
try
{
res = new DNSBLResolver(this, user, b, dnsbl_host, this->add_to_akill);
dnsmanager->Process(res);
}
catch (const SocketException &ex)
{
delete res;
Log(this) << ex.GetReason();
}
}
}
};
MODULE_INIT(ModuleDNSBL)
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