1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd: (C) 2002-2009 InspIRCd Development Team
6 * See: http://wiki.inspircd.org/Credits
8 * This program is free but copyrighted software; see
9 * the file COPYING for details.
11 * ---------------------------------------------------
18 #include <sys/types.h>
19 #include <sys/socket.h>
20 #include <netinet/in.h>
21 #include <arpa/inet.h>
24 /* $ModDesc: Provides handling of DNS blacklists */
26 /* Class holding data for a single entry */
27 class DNSBLConfEntry : public classbase
30 enum EnumBanaction { I_UNKNOWN, I_KILL, I_ZLINE, I_KLINE, I_GLINE, I_MARK };
31 enum EnumType { A_RECORD, A_BITMASK };
32 std::string name, ident, host, domain, reason;
33 EnumBanaction banaction;
37 unsigned char records[256];
38 unsigned long stats_hits, stats_misses;
39 DNSBLConfEntry(): type(A_BITMASK),duration(86400),bitmask(0),stats_hits(0), stats_misses(0) {}
44 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
46 class DNSBLResolver : public Resolver
50 DNSBLConfEntry *ConfEntry;
54 DNSBLResolver(Module *me, InspIRCd *Instance, const std::string &hostname, User* u, int userfd, DNSBLConfEntry *conf, bool &cached)
55 : Resolver(Instance, hostname, DNS_QUERY_A, cached, me)
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 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
68 // Now we calculate the bitmask: 256*(256*(256*a+b)+c)+d
71 unsigned int bitmask = 0, record = 0;
75 inet_aton(result.c_str(), &resultip);
77 switch (ConfEntry->type)
79 case DNSBLConfEntry::A_BITMASK:
80 bitmask = resultip.s_addr >> 24; /* Last octet (network byte order) */
81 bitmask &= ConfEntry->bitmask;
82 match = (bitmask != 0);
84 case DNSBLConfEntry::A_RECORD:
85 record = resultip.s_addr >> 24; /* Last octet */
86 match = (ConfEntry->records[record] == 1);
92 std::string reason = ConfEntry->reason;
93 std::string::size_type x = reason.find("%ip%");
94 while (x != std::string::npos)
97 reason.insert(x, them->GetIPString());
98 x = reason.find("%ip%");
101 ConfEntry->stats_hits++;
103 switch (ConfEntry->banaction)
105 case DNSBLConfEntry::I_KILL:
107 ServerInstance->Users->QuitUser(them, std::string("Killed (") + reason + ")");
110 case DNSBLConfEntry::I_MARK:
112 if (!ConfEntry->ident.empty())
114 them->WriteServ("304 " + them->nick + " :Your ident has been set to " + ConfEntry->ident + " because you matched " + reason);
115 them->ChangeIdent(ConfEntry->ident.c_str());
118 if (!ConfEntry->host.empty())
120 them->WriteServ("304 " + them->nick + " :Your host has been set to " + ConfEntry->host + " because you matched " + reason);
121 them->ChangeDisplayedHost(ConfEntry->host.c_str());
126 case DNSBLConfEntry::I_KLINE:
128 KLine* kl = new KLine(ServerInstance, ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName, reason.c_str(),
129 "*", them->GetIPString());
130 if (ServerInstance->XLines->AddLine(kl,NULL))
132 ServerInstance->SNO->WriteGlobalSno('x',"K:line added due to DNSBL match on *@%s to expire on %s: %s",
133 them->GetIPString(), ServerInstance->TimeString(kl->expiry).c_str(), reason.c_str());
134 ServerInstance->XLines->ApplyLines();
140 case DNSBLConfEntry::I_GLINE:
142 GLine* gl = new GLine(ServerInstance, ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName, reason.c_str(),
143 "*", them->GetIPString());
144 if (ServerInstance->XLines->AddLine(gl,NULL))
146 ServerInstance->SNO->WriteGlobalSno('x',"G:line added due to DNSBL match on *@%s to expire on %s: %s",
147 them->GetIPString(), ServerInstance->TimeString(gl->expiry).c_str(), reason.c_str());
148 ServerInstance->XLines->ApplyLines();
154 case DNSBLConfEntry::I_ZLINE:
156 ZLine* zl = new ZLine(ServerInstance, ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName, reason.c_str(),
157 them->GetIPString());
158 if (ServerInstance->XLines->AddLine(zl,NULL))
160 ServerInstance->SNO->WriteGlobalSno('x',"Z:line added due to DNSBL match on *@%s to expire on %s: %s",
161 them->GetIPString(), ServerInstance->TimeString(zl->expiry).c_str(), reason.c_str());
162 ServerInstance->XLines->ApplyLines();
168 case DNSBLConfEntry::I_UNKNOWN:
175 ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s detected as being on a DNS blacklist (%s) with result %d", them->GetFullRealHost().c_str(), ConfEntry->domain.c_str(), (ConfEntry->type==DNSBLConfEntry::A_BITMASK) ? bitmask : record);
178 ConfEntry->stats_misses++;
181 ConfEntry->stats_misses++;
185 virtual void OnError(ResolverError e, const std::string &errormessage)
189 virtual ~DNSBLResolver()
194 class ModuleDNSBL : public Module
197 std::vector<DNSBLConfEntry *> DNSBLConfEntries;
200 * Convert a string to EnumBanaction
202 DNSBLConfEntry::EnumBanaction str2banaction(const std::string &action)
204 if(action.compare("KILL")==0)
205 return DNSBLConfEntry::I_KILL;
206 if(action.compare("KLINE")==0)
207 return DNSBLConfEntry::I_KLINE;
208 if(action.compare("ZLINE")==0)
209 return DNSBLConfEntry::I_ZLINE;
210 if(action.compare("GLINE")==0)
211 return DNSBLConfEntry::I_GLINE;
212 if(action.compare("MARK")==0)
213 return DNSBLConfEntry::I_MARK;
215 return DNSBLConfEntry::I_UNKNOWN;
218 ModuleDNSBL(InspIRCd *Me) : Module(Me)
221 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnStats };
222 ServerInstance->Modules->Attach(eventlist, this, 3);
225 virtual ~ModuleDNSBL()
230 virtual Version GetVersion()
232 return Version("$Id$", VF_VENDOR, API_VERSION);
236 /** Clear entries and free the mem it was using
240 for (std::vector<DNSBLConfEntry *>::iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); i++)
242 DNSBLConfEntries.clear();
245 /** Fill our conf vector with data
247 virtual void ReadConf()
249 ConfigReader *MyConf = new ConfigReader(ServerInstance);
252 for (int i=0; i< MyConf->Enumerate("dnsbl"); i++)
254 DNSBLConfEntry *e = new DNSBLConfEntry();
256 e->name = MyConf->ReadValue("dnsbl", "name", i);
257 e->ident = MyConf->ReadValue("dnsbl", "ident", i);
258 e->host = MyConf->ReadValue("dnsbl", "host", i);
259 e->reason = MyConf->ReadValue("dnsbl", "reason", i);
260 e->domain = MyConf->ReadValue("dnsbl", "domain", i);
262 if (MyConf->ReadValue("dnsbl", "type", i) == "bitmask")
264 e->type = DNSBLConfEntry::A_BITMASK;
265 e->bitmask = MyConf->ReadInteger("dnsbl", "bitmask", i, false);
269 memset(e->records, 0, sizeof(e->records));
270 e->type = DNSBLConfEntry::A_RECORD;
271 irc::portparser portrange(MyConf->ReadValue("dnsbl", "records", i), false);
273 while ((item = portrange.GetToken()))
274 e->records[item] = 1;
277 e->banaction = str2banaction(MyConf->ReadValue("dnsbl", "action", i));
278 e->duration = ServerInstance->Duration(MyConf->ReadValue("dnsbl", "duration", "60", i));
280 /* Use portparser for record replies */
282 /* yeah, logic here is a little messy */
283 if ((e->bitmask <= 0) && (DNSBLConfEntry::A_BITMASK == e->type))
285 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): invalid bitmask",i);
287 else if (e->name.empty())
289 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): Invalid name",i);
291 else if (e->domain.empty())
293 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): Invalid domain",i);
295 else if (e->banaction == DNSBLConfEntry::I_UNKNOWN)
297 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): Invalid banaction", i);
299 else if (e->duration <= 0)
301 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): Invalid duration", i);
305 if (e->reason.empty())
307 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): empty reason, using defaults",i);
308 e->reason = "Your IP has been blacklisted.";
311 /* add it, all is ok */
312 DNSBLConfEntries.push_back(e);
316 /* delete and drop it, error somewhere */
323 virtual void OnRehash(User* user)
328 virtual ModResult OnUserRegister(User* user)
330 /* only do lookups on local users */
333 /* following code taken from bopm, reverses an IP address. */
335 unsigned char a, b, c, d;
336 char reversedipbuf[128];
337 std::string reversedip;
340 success = inet_aton(user->GetIPString(), &in);
343 return MOD_RES_PASSTHRU;
345 d = (unsigned char) (in.s_addr >> 24) & 0xFF;
346 c = (unsigned char) (in.s_addr >> 16) & 0xFF;
347 b = (unsigned char) (in.s_addr >> 8) & 0xFF;
348 a = (unsigned char) in.s_addr & 0xFF;
350 snprintf(reversedipbuf, 128, "%d.%d.%d.%d", d, c, b, a);
351 reversedip = std::string(reversedipbuf);
353 // For each DNSBL, we will run through this lookup
354 for (std::vector<DNSBLConfEntry *>::iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); i++)
356 // Fill hostname with a dnsbl style host (d.c.b.a.domain.tld)
357 std::string hostname = reversedip + "." + (*i)->domain;
359 /* now we'd need to fire off lookups for `hostname'. */
361 DNSBLResolver *r = new DNSBLResolver(this, ServerInstance, hostname, user, user->GetFd(), *i, cached);
362 ServerInstance->AddResolver(r, cached);
366 /* don't do anything with this hot potato */
367 return MOD_RES_PASSTHRU;
370 virtual ModResult OnStats(char symbol, User* user, string_list &results)
373 return MOD_RES_PASSTHRU;
375 unsigned long total_hits = 0, total_misses = 0;
377 for (std::vector<DNSBLConfEntry*>::iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); i++)
379 total_hits += (*i)->stats_hits;
380 total_misses += (*i)->stats_misses;
382 results.push_back(std::string(ServerInstance->Config->ServerName) + " 304 " + user->nick + " :DNSBLSTATS DNSbl \"" + (*i)->name + "\" had " +
383 ConvToStr((*i)->stats_hits) + " hits and " + ConvToStr((*i)->stats_misses) + " misses");
386 results.push_back(std::string(ServerInstance->Config->ServerName) + " 304 " + user->nick + " :DNSBLSTATS Total hits: " + ConvToStr(total_hits));
387 results.push_back(std::string(ServerInstance->Config->ServerName) + " 304 " + user->nick + " :DNSBLSTATS Total misses: " + ConvToStr(total_misses));
389 return MOD_RES_PASSTHRU;
393 MODULE_INIT(ModuleDNSBL)