2 * InspIRCd -- Internet Relay Chat Daemon
4 * Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
5 * Copyright (C) 2006-2008 Robin Burchell <robin+git@viroteck.net>
6 * Copyright (C) 2007 Craig Edwards <craigedwards@brainbox.cc>
7 * Copyright (C) 2006-2007 Dennis Friis <peavey@inspircd.org>
8 * Copyright (C) 2007 John Brooks <john.brooks@dereferenced.net>
10 * This file is part of InspIRCd. InspIRCd is free software: you can
11 * redistribute it and/or modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation, version 2.
14 * This program is distributed in the hope that it will be useful, but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
16 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
19 * You should have received a copy of the GNU General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
26 #include "modules/dns.h"
28 /* Class holding data for a single entry */
29 class DNSBLConfEntry : public refcountbase
32 enum EnumBanaction { I_UNKNOWN, I_KILL, I_ZLINE, I_KLINE, I_GLINE, I_MARK };
33 enum EnumType { A_RECORD, A_BITMASK };
34 std::string name, ident, host, domain, reason;
35 EnumBanaction banaction;
39 unsigned char records[256];
40 unsigned long stats_hits, stats_misses;
41 DNSBLConfEntry(): type(A_BITMASK),duration(86400),bitmask(0),stats_hits(0), stats_misses(0) {}
45 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
47 class DNSBLResolver : public DNS::Request
50 LocalStringExt& nameExt;
51 LocalIntExt& countExt;
52 reference<DNSBLConfEntry> ConfEntry;
56 DNSBLResolver(DNS::Manager *mgr, Module *me, LocalStringExt& match, LocalIntExt& ctr, const std::string &hostname, LocalUser* u, reference<DNSBLConfEntry> conf)
57 : DNS::Request(mgr, me, hostname, DNS::QUERY_A, true), theiruid(u->uuid), nameExt(match), countExt(ctr), ConfEntry(conf)
61 /* Note: This may be called multiple times for multiple A record results */
62 void OnLookupComplete(const DNS::Query *r) CXX11_OVERRIDE
64 /* Check the user still exists */
65 LocalUser* them = (LocalUser*)ServerInstance->FindUUID(theiruid);
69 const DNS::ResourceRecord* const ans_record = r->FindAnswerOfType(DNS::QUERY_A);
73 // All replies should be in 127.0.0.0/8
74 if (ans_record->rdata.compare(0, 4, "127.") != 0)
76 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL: %s returned address outside of acceptable subnet 127.0.0.0/8: %s", ConfEntry->domain.c_str(), ans_record->rdata.c_str());
77 ConfEntry->stats_misses++;
81 int i = countExt.get(them);
83 countExt.set(them, i - 1);
85 // Now we calculate the bitmask: 256*(256*(256*a+b)+c)+d
87 unsigned int bitmask = 0, record = 0;
91 inet_pton(AF_INET, ans_record->rdata.c_str(), &resultip);
93 switch (ConfEntry->type)
95 case DNSBLConfEntry::A_BITMASK:
96 bitmask = resultip.s_addr >> 24; /* Last octet (network byte order) */
97 bitmask &= ConfEntry->bitmask;
98 match = (bitmask != 0);
100 case DNSBLConfEntry::A_RECORD:
101 record = resultip.s_addr >> 24; /* Last octet */
102 match = (ConfEntry->records[record] == 1);
108 std::string reason = ConfEntry->reason;
109 std::string::size_type x = reason.find("%ip%");
110 while (x != std::string::npos)
113 reason.insert(x, them->GetIPString());
114 x = reason.find("%ip%");
117 ConfEntry->stats_hits++;
119 switch (ConfEntry->banaction)
121 case DNSBLConfEntry::I_KILL:
123 ServerInstance->Users->QuitUser(them, "Killed (" + reason + ")");
126 case DNSBLConfEntry::I_MARK:
128 if (!ConfEntry->ident.empty())
130 them->WriteNumeric(304, "Your ident has been set to " + ConfEntry->ident + " because you matched " + reason);
131 them->ChangeIdent(ConfEntry->ident);
134 if (!ConfEntry->host.empty())
136 them->WriteNumeric(304, "Your host has been set to " + ConfEntry->host + " because you matched " + reason);
137 them->ChangeDisplayedHost(ConfEntry->host);
140 nameExt.set(them, ConfEntry->name);
143 case DNSBLConfEntry::I_KLINE:
145 KLine* kl = new KLine(ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName.c_str(), reason.c_str(),
146 "*", them->GetIPString());
147 if (ServerInstance->XLines->AddLine(kl,NULL))
149 std::string timestr = InspIRCd::TimeString(kl->expiry);
150 ServerInstance->SNO->WriteGlobalSno('x',"K:line added due to DNSBL match on *@%s to expire on %s: %s",
151 them->GetIPString().c_str(), timestr.c_str(), reason.c_str());
152 ServerInstance->XLines->ApplyLines();
161 case DNSBLConfEntry::I_GLINE:
163 GLine* gl = new GLine(ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName.c_str(), reason.c_str(),
164 "*", them->GetIPString());
165 if (ServerInstance->XLines->AddLine(gl,NULL))
167 std::string timestr = InspIRCd::TimeString(gl->expiry);
168 ServerInstance->SNO->WriteGlobalSno('x',"G:line added due to DNSBL match on *@%s to expire on %s: %s",
169 them->GetIPString().c_str(), timestr.c_str(), reason.c_str());
170 ServerInstance->XLines->ApplyLines();
179 case DNSBLConfEntry::I_ZLINE:
181 ZLine* zl = new ZLine(ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName.c_str(), reason.c_str(),
182 them->GetIPString());
183 if (ServerInstance->XLines->AddLine(zl,NULL))
185 std::string timestr = InspIRCd::TimeString(zl->expiry);
186 ServerInstance->SNO->WriteGlobalSno('x',"Z:line added due to DNSBL match on %s to expire on %s: %s",
187 them->GetIPString().c_str(), timestr.c_str(), reason.c_str());
188 ServerInstance->XLines->ApplyLines();
197 case DNSBLConfEntry::I_UNKNOWN:
202 ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s%s detected as being on a DNS blacklist (%s) with result %d", them->nick.empty() ? "<unknown>" : "", them->GetFullRealHost().c_str(), ConfEntry->domain.c_str(), (ConfEntry->type==DNSBLConfEntry::A_BITMASK) ? bitmask : record);
205 ConfEntry->stats_misses++;
208 void OnError(const DNS::Query *q) CXX11_OVERRIDE
210 LocalUser* them = (LocalUser*)ServerInstance->FindUUID(theiruid);
214 int i = countExt.get(them);
216 countExt.set(them, i - 1);
218 if (q->error == DNS::ERROR_NO_RECORDS || q->error == DNS::ERROR_DOMAIN_NOT_FOUND)
219 ConfEntry->stats_misses++;
223 class ModuleDNSBL : public Module
225 std::vector<reference<DNSBLConfEntry> > DNSBLConfEntries;
226 dynamic_reference<DNS::Manager> DNS;
227 LocalStringExt nameExt;
228 LocalIntExt countExt;
231 * Convert a string to EnumBanaction
233 DNSBLConfEntry::EnumBanaction str2banaction(const std::string &action)
235 if(action.compare("KILL")==0)
236 return DNSBLConfEntry::I_KILL;
237 if(action.compare("KLINE")==0)
238 return DNSBLConfEntry::I_KLINE;
239 if(action.compare("ZLINE")==0)
240 return DNSBLConfEntry::I_ZLINE;
241 if(action.compare("GLINE")==0)
242 return DNSBLConfEntry::I_GLINE;
243 if(action.compare("MARK")==0)
244 return DNSBLConfEntry::I_MARK;
246 return DNSBLConfEntry::I_UNKNOWN;
251 , nameExt("dnsbl_match", ExtensionItem::EXT_USER, this)
252 , countExt("dnsbl_pending", ExtensionItem::EXT_USER, this)
256 Version GetVersion() CXX11_OVERRIDE
258 return Version("Provides handling of DNS blacklists", VF_VENDOR);
261 /** Fill our conf vector with data
263 void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
265 DNSBLConfEntries.clear();
267 ConfigTagList dnsbls = ServerInstance->Config->ConfTags("dnsbl");
268 for(ConfigIter i = dnsbls.first; i != dnsbls.second; ++i)
270 ConfigTag* tag = i->second;
271 reference<DNSBLConfEntry> e = new DNSBLConfEntry();
273 e->name = tag->getString("name");
274 e->ident = tag->getString("ident");
275 e->host = tag->getString("host");
276 e->reason = tag->getString("reason");
277 e->domain = tag->getString("domain");
279 if (tag->getString("type") == "bitmask")
281 e->type = DNSBLConfEntry::A_BITMASK;
282 e->bitmask = tag->getInt("bitmask");
286 memset(e->records, 0, sizeof(e->records));
287 e->type = DNSBLConfEntry::A_RECORD;
288 irc::portparser portrange(tag->getString("records"), false);
290 while ((item = portrange.GetToken()))
291 e->records[item] = 1;
294 e->banaction = str2banaction(tag->getString("action"));
295 e->duration = tag->getDuration("duration", 60, 1);
297 /* Use portparser for record replies */
299 /* yeah, logic here is a little messy */
300 if ((e->bitmask <= 0) && (DNSBLConfEntry::A_BITMASK == e->type))
302 std::string location = tag->getTagLocation();
303 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): invalid bitmask", location.c_str());
305 else if (e->name.empty())
307 std::string location = tag->getTagLocation();
308 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): Invalid name", location.c_str());
310 else if (e->domain.empty())
312 std::string location = tag->getTagLocation();
313 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): Invalid domain", location.c_str());
315 else if (e->banaction == DNSBLConfEntry::I_UNKNOWN)
317 std::string location = tag->getTagLocation();
318 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): Invalid banaction", location.c_str());
322 if (e->reason.empty())
324 std::string location = tag->getTagLocation();
325 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): empty reason, using defaults", location.c_str());
326 e->reason = "Your IP has been blacklisted.";
329 /* add it, all is ok */
330 DNSBLConfEntries.push_back(e);
335 void OnSetUserIP(LocalUser* user) CXX11_OVERRIDE
337 if ((user->exempt) || !DNS)
342 if (!user->MyClass->config->getBool("usednsbl", true))
346 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "User has no connect class in OnSetUserIP");
348 std::string reversedip;
349 if (user->client_sa.sa.sa_family == AF_INET)
351 unsigned int a, b, c, d;
352 d = (unsigned int) (user->client_sa.in4.sin_addr.s_addr >> 24) & 0xFF;
353 c = (unsigned int) (user->client_sa.in4.sin_addr.s_addr >> 16) & 0xFF;
354 b = (unsigned int) (user->client_sa.in4.sin_addr.s_addr >> 8) & 0xFF;
355 a = (unsigned int) user->client_sa.in4.sin_addr.s_addr & 0xFF;
357 reversedip = ConvToStr(d) + "." + ConvToStr(c) + "." + ConvToStr(b) + "." + ConvToStr(a);
359 else if (user->client_sa.sa.sa_family == AF_INET6)
361 const unsigned char* ip = user->client_sa.in6.sin6_addr.s6_addr;
363 std::string buf = BinToHex(ip, 16);
364 for (std::string::const_reverse_iterator it = buf.rbegin(); it != buf.rend(); ++it)
366 reversedip.push_back(*it);
367 reversedip.push_back('.');
373 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Reversed IP %s -> %s", user->GetIPString().c_str(), reversedip.c_str());
375 countExt.set(user, DNSBLConfEntries.size());
377 // For each DNSBL, we will run through this lookup
378 for (unsigned i = 0; i < DNSBLConfEntries.size(); ++i)
380 // Fill hostname with a dnsbl style host (d.c.b.a.domain.tld)
381 std::string hostname = reversedip + "." + DNSBLConfEntries[i]->domain;
383 /* now we'd need to fire off lookups for `hostname'. */
384 DNSBLResolver *r = new DNSBLResolver(*this->DNS, this, nameExt, countExt, hostname, user, DNSBLConfEntries[i]);
387 this->DNS->Process(r);
389 catch (DNS::Exception &ex)
392 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, ex.GetReason());
400 ModResult OnSetConnectClass(LocalUser* user, ConnectClass* myclass) CXX11_OVERRIDE
403 if (!myclass->config->readString("dnsbl", dnsbl))
404 return MOD_RES_PASSTHRU;
405 std::string* match = nameExt.get(user);
406 std::string myname = match ? *match : "";
408 return MOD_RES_PASSTHRU;
412 ModResult OnCheckReady(LocalUser *user) CXX11_OVERRIDE
414 if (countExt.get(user))
416 return MOD_RES_PASSTHRU;
419 ModResult OnStats(Stats::Context& stats) CXX11_OVERRIDE
421 if (stats.GetSymbol() != 'd')
422 return MOD_RES_PASSTHRU;
424 unsigned long total_hits = 0, total_misses = 0;
426 for (std::vector<reference<DNSBLConfEntry> >::const_iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); ++i)
428 total_hits += (*i)->stats_hits;
429 total_misses += (*i)->stats_misses;
431 stats.AddRow(304, "DNSBLSTATS DNSbl \"" + (*i)->name + "\" had " +
432 ConvToStr((*i)->stats_hits) + " hits and " + ConvToStr((*i)->stats_misses) + " misses");
435 stats.AddRow(304, "DNSBLSTATS Total hits: " + ConvToStr(total_hits));
436 stats.AddRow(304, "DNSBLSTATS Total misses: " + ConvToStr(total_misses));
438 return MOD_RES_PASSTHRU;
442 MODULE_INIT(ModuleDNSBL)