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 */
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) {}
46 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
48 class DNSBLResolver : public Resolver
51 LocalStringExt& nameExt;
52 LocalIntExt& countExt;
53 DNSBLConfEntry *ConfEntry;
57 DNSBLResolver(Module *me, LocalStringExt& match, LocalIntExt& ctr, const std::string &hostname, LocalUser* u, DNSBLConfEntry *conf, bool &cached)
58 : Resolver(hostname, DNS_QUERY_A, cached, me), theiruid(u->uuid), nameExt(match), countExt(ctr), ConfEntry(conf)
62 /* Note: This may be called multiple times for multiple A record results */
63 virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
65 /* Check the user still exists */
66 LocalUser* them = (LocalUser*)ServerInstance->FindUUID(theiruid);
69 int i = countExt.get(them);
71 countExt.set(them, i - 1);
72 // Now we calculate the bitmask: 256*(256*(256*a+b)+c)+d
75 unsigned int bitmask = 0, record = 0;
79 inet_aton(result.c_str(), &resultip);
81 switch (ConfEntry->type)
83 case DNSBLConfEntry::A_BITMASK:
84 bitmask = resultip.s_addr >> 24; /* Last octet (network byte order) */
85 bitmask &= ConfEntry->bitmask;
86 match = (bitmask != 0);
88 case DNSBLConfEntry::A_RECORD:
89 record = resultip.s_addr >> 24; /* Last octet */
90 match = (ConfEntry->records[record] == 1);
96 std::string reason = ConfEntry->reason;
97 std::string::size_type x = reason.find("%ip%");
98 while (x != std::string::npos)
101 reason.insert(x, them->GetIPString());
102 x = reason.find("%ip%");
105 ConfEntry->stats_hits++;
107 switch (ConfEntry->banaction)
109 case DNSBLConfEntry::I_KILL:
111 ServerInstance->Users->QuitUser(them, "Killed (" + reason + ")");
114 case DNSBLConfEntry::I_MARK:
116 if (!ConfEntry->ident.empty())
118 them->WriteServ("304 " + them->nick + " :Your ident has been set to " + ConfEntry->ident + " because you matched " + reason);
119 them->ChangeIdent(ConfEntry->ident.c_str());
122 if (!ConfEntry->host.empty())
124 them->WriteServ("304 " + them->nick + " :Your host has been set to " + ConfEntry->host + " because you matched " + reason);
125 them->ChangeDisplayedHost(ConfEntry->host.c_str());
128 nameExt.set(them, ConfEntry->name);
131 case DNSBLConfEntry::I_KLINE:
133 KLine* kl = new KLine(ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName.c_str(), reason.c_str(),
134 "*", them->GetIPString());
135 if (ServerInstance->XLines->AddLine(kl,NULL))
137 std::string timestr = ServerInstance->TimeString(kl->expiry);
138 ServerInstance->SNO->WriteGlobalSno('x',"K:line added due to DNSBL match on *@%s to expire on %s: %s",
139 them->GetIPString().c_str(), timestr.c_str(), reason.c_str());
140 ServerInstance->XLines->ApplyLines();
146 case DNSBLConfEntry::I_GLINE:
148 GLine* gl = new GLine(ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName.c_str(), reason.c_str(),
149 "*", them->GetIPString());
150 if (ServerInstance->XLines->AddLine(gl,NULL))
152 std::string timestr = ServerInstance->TimeString(gl->expiry);
153 ServerInstance->SNO->WriteGlobalSno('x',"G:line added due to DNSBL match on *@%s to expire on %s: %s",
154 them->GetIPString().c_str(), timestr.c_str(), reason.c_str());
155 ServerInstance->XLines->ApplyLines();
161 case DNSBLConfEntry::I_ZLINE:
163 ZLine* zl = new ZLine(ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName.c_str(), reason.c_str(),
164 them->GetIPString());
165 if (ServerInstance->XLines->AddLine(zl,NULL))
167 std::string timestr = ServerInstance->TimeString(zl->expiry);
168 ServerInstance->SNO->WriteGlobalSno('x',"Z: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();
176 case DNSBLConfEntry::I_UNKNOWN:
183 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);
186 ConfEntry->stats_misses++;
189 ConfEntry->stats_misses++;
193 virtual void OnError(ResolverError e, const std::string &errormessage)
195 LocalUser* them = (LocalUser*)ServerInstance->FindUUID(theiruid);
198 int i = countExt.get(them);
200 countExt.set(them, i - 1);
205 class ModuleDNSBL : public Module
207 std::vector<DNSBLConfEntry *> DNSBLConfEntries;
208 LocalStringExt nameExt;
209 LocalIntExt countExt;
212 * Convert a string to EnumBanaction
214 DNSBLConfEntry::EnumBanaction str2banaction(const std::string &action)
216 if(action.compare("KILL")==0)
217 return DNSBLConfEntry::I_KILL;
218 if(action.compare("KLINE")==0)
219 return DNSBLConfEntry::I_KLINE;
220 if(action.compare("ZLINE")==0)
221 return DNSBLConfEntry::I_ZLINE;
222 if(action.compare("GLINE")==0)
223 return DNSBLConfEntry::I_GLINE;
224 if(action.compare("MARK")==0)
225 return DNSBLConfEntry::I_MARK;
227 return DNSBLConfEntry::I_UNKNOWN;
230 ModuleDNSBL() : nameExt("dnsbl_match", this), countExt("dnsbl_pending", this) { }
235 ServerInstance->Modules->AddService(nameExt);
236 ServerInstance->Modules->AddService(countExt);
237 Implementation eventlist[] = { I_OnRehash, I_OnSetUserIP, I_OnStats, I_OnSetConnectClass, I_OnCheckReady };
238 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
241 virtual ~ModuleDNSBL()
248 return Version("Provides handling of DNS blacklists", VF_VENDOR);
251 /** Clear entries and free the mem it was using
255 for (std::vector<DNSBLConfEntry *>::iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); i++)
257 DNSBLConfEntries.clear();
260 /** Fill our conf vector with data
266 ConfigTagList dnsbls = ServerInstance->Config->ConfTags("dnsbl");
267 for(ConfigIter i = dnsbls.first; i != dnsbls.second; ++i)
269 ConfigTag* tag = i->second;
270 DNSBLConfEntry *e = new DNSBLConfEntry();
272 e->name = tag->getString("name");
273 e->ident = tag->getString("ident");
274 e->host = tag->getString("host");
275 e->reason = tag->getString("reason");
276 e->domain = tag->getString("domain");
278 if (tag->getString("type") == "bitmask")
280 e->type = DNSBLConfEntry::A_BITMASK;
281 e->bitmask = tag->getInt("bitmask");
285 memset(e->records, 0, sizeof(e->records));
286 e->type = DNSBLConfEntry::A_RECORD;
287 irc::portparser portrange(tag->getString("records"), false);
289 while ((item = portrange.GetToken()))
290 e->records[item] = 1;
293 e->banaction = str2banaction(tag->getString("action"));
294 e->duration = InspIRCd::Duration(tag->getString("duration", "60"));
296 /* Use portparser for record replies */
298 /* yeah, logic here is a little messy */
299 if ((e->bitmask <= 0) && (DNSBLConfEntry::A_BITMASK == e->type))
301 std::string location = tag->getTagLocation();
302 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): invalid bitmask", location.c_str());
304 else if (e->name.empty())
306 std::string location = tag->getTagLocation();
307 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): Invalid name", location.c_str());
309 else if (e->domain.empty())
311 std::string location = tag->getTagLocation();
312 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): Invalid domain", location.c_str());
314 else if (e->banaction == DNSBLConfEntry::I_UNKNOWN)
316 std::string location = tag->getTagLocation();
317 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): Invalid banaction", location.c_str());
319 else if (e->duration <= 0)
321 std::string location = tag->getTagLocation();
322 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): Invalid duration", location.c_str());
326 if (e->reason.empty())
328 std::string location = tag->getTagLocation();
329 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): empty reason, using defaults", location.c_str());
330 e->reason = "Your IP has been blacklisted.";
333 /* add it, all is ok */
334 DNSBLConfEntries.push_back(e);
338 /* delete and drop it, error somewhere */
343 void OnRehash(User* user)
348 void OnSetUserIP(LocalUser* user)
350 if ((user->exempt) || (user->client_sa.sa.sa_family != AF_INET))
355 if (!user->MyClass->config->getBool("usednsbl", true))
359 ServerInstance->Logs->Log("m_dnsbl", DEBUG, "User has no connect class in OnSetUserIP");
361 unsigned char a, b, c, d;
362 char reversedipbuf[128];
363 std::string reversedip;
365 d = (unsigned char) (user->client_sa.in4.sin_addr.s_addr >> 24) & 0xFF;
366 c = (unsigned char) (user->client_sa.in4.sin_addr.s_addr >> 16) & 0xFF;
367 b = (unsigned char) (user->client_sa.in4.sin_addr.s_addr >> 8) & 0xFF;
368 a = (unsigned char) user->client_sa.in4.sin_addr.s_addr & 0xFF;
370 snprintf(reversedipbuf, 128, "%d.%d.%d.%d", d, c, b, a);
371 reversedip = std::string(reversedipbuf);
373 countExt.set(user, DNSBLConfEntries.size());
375 // For each DNSBL, we will run through this lookup
377 while (i < DNSBLConfEntries.size())
379 // Fill hostname with a dnsbl style host (d.c.b.a.domain.tld)
380 std::string hostname = reversedip + "." + DNSBLConfEntries[i]->domain;
382 /* now we'd need to fire off lookups for `hostname'. */
384 DNSBLResolver *r = new DNSBLResolver(this, nameExt, countExt, hostname, user, DNSBLConfEntries[i], cached);
385 ServerInstance->AddResolver(r, cached);
392 ModResult OnSetConnectClass(LocalUser* user, ConnectClass* myclass)
395 if (!myclass->config->readString("dnsbl", dnsbl))
396 return MOD_RES_PASSTHRU;
397 std::string* match = nameExt.get(user);
398 std::string myname = match ? *match : "";
400 return MOD_RES_PASSTHRU;
404 ModResult OnCheckReady(LocalUser *user)
406 if (countExt.get(user))
408 return MOD_RES_PASSTHRU;
411 ModResult OnStats(char symbol, User* user, string_list &results)
414 return MOD_RES_PASSTHRU;
416 unsigned long total_hits = 0, total_misses = 0;
418 for (std::vector<DNSBLConfEntry*>::iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); i++)
420 total_hits += (*i)->stats_hits;
421 total_misses += (*i)->stats_misses;
423 results.push_back(ServerInstance->Config->ServerName + " 304 " + user->nick + " :DNSBLSTATS DNSbl \"" + (*i)->name + "\" had " +
424 ConvToStr((*i)->stats_hits) + " hits and " + ConvToStr((*i)->stats_misses) + " misses");
427 results.push_back(ServerInstance->Config->ServerName + " 304 " + user->nick + " :DNSBLSTATS Total hits: " + ConvToStr(total_hits));
428 results.push_back(ServerInstance->Config->ServerName + " 304 " + user->nick + " :DNSBLSTATS Total misses: " + ConvToStr(total_misses));
430 return MOD_RES_PASSTHRU;
434 MODULE_INIT(ModuleDNSBL)