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/>.
27 /* $ModDesc: Provides handling of DNS blacklists */
29 /* Class holding data for a single entry */
30 class DNSBLConfEntry : public refcountbase
33 enum EnumBanaction { I_UNKNOWN, I_KILL, I_ZLINE, I_KLINE, I_GLINE, I_MARK };
34 enum EnumType { A_RECORD, A_BITMASK };
35 std::string name, ident, host, domain, reason;
36 EnumBanaction banaction;
40 unsigned char records[256];
41 unsigned long stats_hits, stats_misses;
42 DNSBLConfEntry(): type(A_BITMASK),duration(86400),bitmask(0),stats_hits(0), stats_misses(0) {}
47 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
49 class DNSBLResolver : public Resolver
52 LocalStringExt& nameExt;
53 LocalIntExt& countExt;
54 reference<DNSBLConfEntry> ConfEntry;
58 DNSBLResolver(Module *me, LocalStringExt& match, LocalIntExt& ctr, const std::string &hostname, LocalUser* u, reference<DNSBLConfEntry> conf, bool &cached)
59 : Resolver(hostname, DNS_QUERY_A, cached, me), theiruid(u->uuid), nameExt(match), countExt(ctr), ConfEntry(conf)
63 /* Note: This may be called multiple times for multiple A record results */
64 virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
66 /* Check the user still exists */
67 LocalUser* them = (LocalUser*)ServerInstance->FindUUID(theiruid);
70 int i = countExt.get(them);
72 countExt.set(them, i - 1);
73 // All replies should be in 127.0.0.0/8
74 if (result.compare(0, 4, "127.") == 0)
76 unsigned int bitmask = 0, record = 0;
80 inet_aton(result.c_str(), &resultip);
82 switch (ConfEntry->type)
84 case DNSBLConfEntry::A_BITMASK:
85 // Now we calculate the bitmask: 256*(256*(256*a+b)+c)+d
86 bitmask = resultip.s_addr >> 24; /* Last octet (network byte order) */
87 bitmask &= ConfEntry->bitmask;
88 match = (bitmask != 0);
90 case DNSBLConfEntry::A_RECORD:
91 record = resultip.s_addr >> 24; /* Last octet */
92 match = (ConfEntry->records[record] == 1);
98 std::string reason = ConfEntry->reason;
99 std::string::size_type x = reason.find("%ip%");
100 while (x != std::string::npos)
103 reason.insert(x, them->GetIPString());
104 x = reason.find("%ip%");
107 ConfEntry->stats_hits++;
109 switch (ConfEntry->banaction)
111 case DNSBLConfEntry::I_KILL:
113 ServerInstance->Users->QuitUser(them, "Killed (" + reason + ")");
116 case DNSBLConfEntry::I_MARK:
118 if (!ConfEntry->ident.empty())
120 them->WriteServ("304 " + them->nick + " :Your ident has been set to " + ConfEntry->ident + " because you matched " + reason);
121 them->ChangeIdent(ConfEntry->ident.c_str());
124 if (!ConfEntry->host.empty())
126 them->WriteServ("304 " + them->nick + " :Your host has been set to " + ConfEntry->host + " because you matched " + reason);
127 them->ChangeDisplayedHost(ConfEntry->host.c_str());
130 nameExt.set(them, ConfEntry->name);
133 case DNSBLConfEntry::I_KLINE:
135 KLine* kl = new KLine(ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName.c_str(), reason.c_str(),
136 "*", them->GetIPString());
137 if (ServerInstance->XLines->AddLine(kl,NULL))
139 std::string timestr = ServerInstance->TimeString(kl->expiry);
140 ServerInstance->SNO->WriteGlobalSno('x',"K:line added due to DNSBL match on *@%s to expire on %s: %s",
141 them->GetIPString(), timestr.c_str(), reason.c_str());
142 ServerInstance->XLines->ApplyLines();
151 case DNSBLConfEntry::I_GLINE:
153 GLine* gl = new GLine(ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName.c_str(), reason.c_str(),
154 "*", them->GetIPString());
155 if (ServerInstance->XLines->AddLine(gl,NULL))
157 std::string timestr = ServerInstance->TimeString(gl->expiry);
158 ServerInstance->SNO->WriteGlobalSno('x',"G:line added due to DNSBL match on *@%s to expire on %s: %s",
159 them->GetIPString(), timestr.c_str(), reason.c_str());
160 ServerInstance->XLines->ApplyLines();
169 case DNSBLConfEntry::I_ZLINE:
171 ZLine* zl = new ZLine(ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName.c_str(), reason.c_str(),
172 them->GetIPString());
173 if (ServerInstance->XLines->AddLine(zl,NULL))
175 std::string timestr = ServerInstance->TimeString(zl->expiry);
176 ServerInstance->SNO->WriteGlobalSno('x',"Z:line added due to DNSBL match on *@%s to expire on %s: %s",
177 them->GetIPString(), timestr.c_str(), reason.c_str());
178 ServerInstance->XLines->ApplyLines();
187 case DNSBLConfEntry::I_UNKNOWN:
194 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);
197 ConfEntry->stats_misses++;
202 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL: %s returned address outside of acceptable subnet 127.0.0.0/8: %s", ConfEntry->domain.c_str(), result.c_str());
203 ConfEntry->stats_misses++;
208 virtual void OnError(ResolverError e, const std::string &errormessage)
210 LocalUser* them = (LocalUser*)ServerInstance->FindUUID(theiruid);
213 int i = countExt.get(them);
215 countExt.set(them, i - 1);
219 virtual ~DNSBLResolver()
224 class ModuleDNSBL : public Module
226 std::vector<reference<DNSBLConfEntry> > DNSBLConfEntries;
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;
249 ModuleDNSBL() : nameExt("dnsbl_match", this), countExt("dnsbl_pending", this) { }
254 ServerInstance->Modules->AddService(nameExt);
255 ServerInstance->Modules->AddService(countExt);
256 Implementation eventlist[] = { I_OnRehash, I_OnSetUserIP, I_OnStats, I_OnSetConnectClass, I_OnCheckReady };
257 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
262 return Version("Provides handling of DNS blacklists", VF_VENDOR);
265 /** Fill our conf vector with data
269 DNSBLConfEntries.clear();
271 ConfigTagList dnsbls = ServerInstance->Config->ConfTags("dnsbl");
272 for(ConfigIter i = dnsbls.first; i != dnsbls.second; ++i)
274 ConfigTag* tag = i->second;
275 reference<DNSBLConfEntry> e = new DNSBLConfEntry();
277 e->name = tag->getString("name");
278 e->ident = tag->getString("ident");
279 e->host = tag->getString("host");
280 e->reason = tag->getString("reason");
281 e->domain = tag->getString("domain");
283 if (tag->getString("type") == "bitmask")
285 e->type = DNSBLConfEntry::A_BITMASK;
286 e->bitmask = tag->getInt("bitmask");
290 memset(e->records, 0, sizeof(e->records));
291 e->type = DNSBLConfEntry::A_RECORD;
292 irc::portparser portrange(tag->getString("records"), false);
294 while ((item = portrange.GetToken()))
295 e->records[item] = 1;
298 e->banaction = str2banaction(tag->getString("action"));
299 e->duration = ServerInstance->Duration(tag->getString("duration", "60"));
301 /* Use portparser for record replies */
303 /* yeah, logic here is a little messy */
304 if ((e->bitmask <= 0) && (DNSBLConfEntry::A_BITMASK == e->type))
306 std::string location = tag->getTagLocation();
307 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): invalid bitmask", location.c_str());
309 else if (e->name.empty())
311 std::string location = tag->getTagLocation();
312 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): Invalid name", location.c_str());
314 else if (e->domain.empty())
316 std::string location = tag->getTagLocation();
317 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): Invalid domain", location.c_str());
319 else if (e->banaction == DNSBLConfEntry::I_UNKNOWN)
321 std::string location = tag->getTagLocation();
322 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): Invalid banaction", location.c_str());
324 else if (e->duration <= 0)
326 std::string location = tag->getTagLocation();
327 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): Invalid duration", location.c_str());
331 if (e->reason.empty())
333 std::string location = tag->getTagLocation();
334 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): empty reason, using defaults", location.c_str());
335 e->reason = "Your IP has been blacklisted.";
338 /* add it, all is ok */
339 DNSBLConfEntries.push_back(e);
344 void OnRehash(User* user)
349 void OnSetUserIP(LocalUser* user)
351 if ((user->exempt) || (user->client_sa.sa.sa_family != AF_INET))
356 if (!user->MyClass->config->getBool("usednsbl", true))
360 ServerInstance->Logs->Log("m_dnsbl", DEBUG, "User has no connect class in OnSetUserIP");
362 unsigned char a, b, c, d;
363 char reversedipbuf[128];
364 std::string reversedip;
366 d = (unsigned char) (user->client_sa.in4.sin_addr.s_addr >> 24) & 0xFF;
367 c = (unsigned char) (user->client_sa.in4.sin_addr.s_addr >> 16) & 0xFF;
368 b = (unsigned char) (user->client_sa.in4.sin_addr.s_addr >> 8) & 0xFF;
369 a = (unsigned char) user->client_sa.in4.sin_addr.s_addr & 0xFF;
371 snprintf(reversedipbuf, 128, "%d.%d.%d.%d", d, c, b, a);
372 reversedip = std::string(reversedipbuf);
374 countExt.set(user, DNSBLConfEntries.size());
376 // For each DNSBL, we will run through this lookup
378 while (i < DNSBLConfEntries.size())
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'. */
385 DNSBLResolver *r = new DNSBLResolver(this, nameExt, countExt, hostname, user, DNSBLConfEntries[i], cached);
386 ServerInstance->AddResolver(r, cached);
393 ModResult OnSetConnectClass(LocalUser* user, ConnectClass* myclass)
396 if (!myclass->config->readString("dnsbl", dnsbl))
397 return MOD_RES_PASSTHRU;
398 std::string* match = nameExt.get(user);
399 std::string myname = match ? *match : "";
401 return MOD_RES_PASSTHRU;
405 ModResult OnCheckReady(LocalUser *user)
407 if (countExt.get(user))
409 return MOD_RES_PASSTHRU;
412 ModResult OnStats(char symbol, User* user, string_list &results)
415 return MOD_RES_PASSTHRU;
417 unsigned long total_hits = 0, total_misses = 0;
419 for (std::vector<reference<DNSBLConfEntry> >::const_iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); ++i)
421 total_hits += (*i)->stats_hits;
422 total_misses += (*i)->stats_misses;
424 results.push_back(ServerInstance->Config->ServerName + " 304 " + user->nick + " :DNSBLSTATS DNSbl \"" + (*i)->name + "\" had " +
425 ConvToStr((*i)->stats_hits) + " hits and " + ConvToStr((*i)->stats_misses) + " misses");
428 results.push_back(ServerInstance->Config->ServerName + " 304 " + user->nick + " :DNSBLSTATS Total hits: " + ConvToStr(total_hits));
429 results.push_back(ServerInstance->Config->ServerName + " 304 " + user->nick + " :DNSBLSTATS Total misses: " + ConvToStr(total_misses));
431 return MOD_RES_PASSTHRU;
435 MODULE_INIT(ModuleDNSBL)