X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fmodules%2Fm_dnsbl.cpp;h=7fb652cf715ffa8ee7cd012398fa975dcc45b4b3;hb=b5e220008782b2d538cb8e6e3b1923af0c13fb99;hp=87e9a2cbabea9ffd6877bdbb49fcbad0af66c545;hpb=bab14f0dd2345c9d7dcbc47c918563709e1ac094;p=user%2Fhenk%2Fcode%2Finspircd.git diff --git a/src/modules/m_dnsbl.cpp b/src/modules/m_dnsbl.cpp index 87e9a2cba..7fb652cf7 100644 --- a/src/modules/m_dnsbl.cpp +++ b/src/modules/m_dnsbl.cpp @@ -1 +1,373 @@ -/* +------------------------------------+ * | Inspire Internet Relay Chat Daemon | * +------------------------------------+ * * InspIRCd: (C) 2002-2007 InspIRCd Development Team * See: http://www.inspircd.org/wiki/index.php/Credits * * This program is free but copyrighted software; see * the file COPYING for details. * * --------------------------------------------------- */ #include "inspircd.h" #include "xline.h" #include "dns.h" #include "users.h" #include "channels.h" #include "modules.h" #ifndef WINDOWS #include #include #include #include #endif /* $ModDesc: Provides handling of DNS blacklists */ /* Class holding data for a single entry */ class DNSBLConfEntry { public: enum EnumBanaction { I_UNKNOWN, I_KILL, I_ZLINE, I_KLINE, I_GLINE }; std::string name, domain, reason; EnumBanaction banaction; long duration; int bitmask; unsigned long stats_hits, stats_misses; DNSBLConfEntry(): duration(86400),bitmask(0),stats_hits(0), stats_misses(0) {} ~DNSBLConfEntry() { } }; /** Resolver for CGI:IRC hostnames encoded in ident/GECOS */ class DNSBLResolver : public Resolver { int theirfd; userrec* them; DNSBLConfEntry *ConfEntry; public: DNSBLResolver(Module *me, InspIRCd *ServerInstance, const std::string &hostname, userrec* u, int userfd, DNSBLConfEntry *conf, bool &cached) : Resolver(ServerInstance, hostname, DNS_QUERY_A, cached, me) { theirfd = userfd; them = u; ConfEntry = conf; } virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached) { /* Check the user still exists */ if ((them) && (them == ServerInstance->SE->GetRef(theirfd))) { // Now we calculate the bitmask: 256*(256*(256*a+b)+c)+d if(result.length()) { unsigned int bitmask = 0; bool show = false; in_addr resultip; /* Convert the result to an in_addr (we can gaurantee we got ipv4) * Whoever did the loop that was here before, I AM CONFISCATING * YOUR CRACKPIPE. you know who you are. -- Brain */ inet_aton(result.c_str(), &resultip); bitmask = resultip.s_addr >> 24; /* Last octet (network byte order */ bitmask &= ConfEntry->bitmask; if (bitmask != 0) { std::string reason = ConfEntry->reason; std::string::size_type x = reason.find("%ip%"); while (x != std::string::npos) { reason.erase(x, 4); reason.insert(x, them->GetIPString()); x = reason.find("%ip%"); } ConfEntry->stats_hits++; switch (ConfEntry->banaction) { case DNSBLConfEntry::I_KILL: { userrec::QuitUser(ServerInstance, them, std::string("Killed (") + reason + ")"); break; } case DNSBLConfEntry::I_KLINE: { std::string ban = std::string("*@") + them->GetIPString(); if (show) ServerInstance->XLines->apply_lines(APPLY_KLINES); show = ServerInstance->XLines->add_kline(ConfEntry->duration, ServerInstance->Config->ServerName, reason.c_str(), ban.c_str()); FOREACH_MOD(I_OnAddKLine,OnAddKLine(ConfEntry->duration, NULL, reason, ban)); break; } case DNSBLConfEntry::I_GLINE: { std::string ban = std::string("*@") + them->GetIPString(); show = ServerInstance->XLines->add_gline(ConfEntry->duration, ServerInstance->Config->ServerName, reason.c_str(), ban.c_str()); if (show) ServerInstance->XLines->apply_lines(APPLY_GLINES); FOREACH_MOD(I_OnAddGLine,OnAddGLine(ConfEntry->duration, NULL, reason, ban)); break; } case DNSBLConfEntry::I_ZLINE: { show = ServerInstance->XLines->add_zline(ConfEntry->duration, ServerInstance->Config->ServerName, reason.c_str(), them->GetIPString()); if (show) ServerInstance->XLines->apply_lines(APPLY_ZLINES); FOREACH_MOD(I_OnAddZLine,OnAddZLine(ConfEntry->duration, NULL, reason, them->GetIPString())); break; } case DNSBLConfEntry::I_UNKNOWN: { break; } break; } if (show) { ServerInstance->WriteOpers("*** Connecting user %s detected as being on a DNS blacklist (%s) with result %d", them->GetFullRealHost(), ConfEntry->name.c_str(), bitmask); } } else ConfEntry->stats_misses++; } else ConfEntry->stats_misses++; } } virtual void OnError(ResolverError e, const std::string &errormessage) { } virtual ~DNSBLResolver() { } }; class ModuleDNSBL : public Module { private: std::vector DNSBLConfEntries; /* * Convert a string to EnumBanaction */ DNSBLConfEntry::EnumBanaction str2banaction(const std::string &action) { if(action.compare("KILL")==0) return DNSBLConfEntry::I_KILL; if(action.compare("KLINE")==0) return DNSBLConfEntry::I_KLINE; if(action.compare("ZLINE")==0) return DNSBLConfEntry::I_ZLINE; if(action.compare("GLINE")==0) return DNSBLConfEntry::I_GLINE; return DNSBLConfEntry::I_UNKNOWN; } public: ModuleDNSBL(InspIRCd *Me) : Module(Me) { ReadConf(); } virtual ~ModuleDNSBL() { ClearEntries(); } virtual Version GetVersion() { return Version(2, 0, 0, 1, VF_VENDOR, API_VERSION); } void Implements(char* List) { List[I_OnRehash] = List[I_OnUserRegister] = List[I_OnStats] = 1; } /** Clear entries and free the mem it was using */ void ClearEntries() { std::vector::iterator i; for (std::vector::iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); i++) delete *i; DNSBLConfEntries.clear(); } /** Fill our conf vector with data */ virtual void ReadConf() { ConfigReader *MyConf = new ConfigReader(ServerInstance); ClearEntries(); for (int i=0; i< MyConf->Enumerate("dnsbl"); i++) { DNSBLConfEntry *e = new DNSBLConfEntry(); e->name = MyConf->ReadValue("dnsbl", "name", i); e->reason = MyConf->ReadValue("dnsbl", "reason", i); e->domain = MyConf->ReadValue("dnsbl", "domain", i); e->banaction = str2banaction(MyConf->ReadValue("dnsbl", "action", i)); e->duration = ServerInstance->Duration(MyConf->ReadValue("dnsbl", "duration", i)); e->bitmask = MyConf->ReadInteger("dnsbl", "bitmask", i, false); /* yeah, logic here is a little messy */ if (e->bitmask <= 0) { ServerInstance->WriteOpers("*** DNSBL(#%d): invalid bitmask",i); } else if (e->name.empty()) { ServerInstance->WriteOpers("*** DNSBL(#%d): Invalid name",i); } else if (e->domain.empty()) { ServerInstance->WriteOpers("*** DNSBL(#%d): Invalid domain",i); } else if (e->banaction == DNSBLConfEntry::I_UNKNOWN) { ServerInstance->WriteOpers("*** DNSBL(#%d): Invalid banaction", i); } else { if (e->reason.empty()) { ServerInstance->WriteOpers("*** DNSBL(#%d): empty reason, using defaults",i); e->reason = "Your IP has been blacklisted."; } /* add it, all is ok */ DNSBLConfEntries.push_back(e); continue; } /* delete and drop it, error somewhere */ delete e; } delete MyConf; } virtual void OnRehash(userrec* user, const std::string ¶meter) { ReadConf(); } virtual int OnUserRegister(userrec* user) { /* only do lookups on local users */ if (IS_LOCAL(user)) { /* following code taken from bopm, reverses an IP address. */ struct in_addr in; unsigned char a, b, c, d; char reversedipbuf[128]; std::string reversedip; bool success = false; if (!inet_aton(user->GetIPString(), &in)) { #ifdef IPV6 /* We could have an ipv6 address here */ std::string x = user->GetIPString(); /* Is it a 4in6 address? (Compensate for this kernel kludge that people love) */ if (x.find("0::ffff:") == 0) { x.erase(x.begin(), x.begin() + 8); if (inet_aton(x.c_str(), &in)) success = true; } #endif } else { success = true; } if (!success) return 0; d = (unsigned char) (in.s_addr >> 24) & 0xFF; c = (unsigned char) (in.s_addr >> 16) & 0xFF; b = (unsigned char) (in.s_addr >> 8) & 0xFF; a = (unsigned char) in.s_addr & 0xFF; snprintf(reversedipbuf, 128, "%d.%d.%d.%d", d, c, b, a); reversedip = std::string(reversedipbuf); // For each DNSBL, we will run through this lookup for (std::vector::iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); i++) { // Fill hostname with a dnsbl style host (d.c.b.a.domain.tld) std::string hostname = reversedip + "." + (*i)->domain; /* now we'd need to fire off lookups for `hostname'. */ bool cached; DNSBLResolver *r = new DNSBLResolver(this, ServerInstance, hostname, user, user->GetFd(), *i, cached); ServerInstance->AddResolver(r, cached); } } /* don't do anything with this hot potato */ return 0; } virtual int OnStats(char symbol, userrec* user, string_list &results) { if (symbol != 'd') return 0; unsigned long total_hits = 0, total_misses = 0; for (std::vector::iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); i++) { total_hits += (*i)->stats_hits; total_misses += (*i)->stats_misses; results.push_back(std::string(ServerInstance->Config->ServerName) + " 304 " + user->nick + " :DNSBLSTATS DNSbl \"" + (*i)->name + "\" had " + ConvToStr((*i)->stats_hits) + " hits and " + ConvToStr((*i)->stats_misses) + " misses"); } results.push_back(std::string(ServerInstance->Config->ServerName) + " 304 " + user->nick + " :DNSBLSTATS Total hits: " + ConvToStr(total_hits)); results.push_back(std::string(ServerInstance->Config->ServerName) + " 304 " + user->nick + " :DNSBLSTATS Total misses: " + ConvToStr(total_misses)); return 0; } }; MODULE_INIT(ModuleDNSBL) \ No newline at end of file +/* +------------------------------------+ + * | Inspire Internet Relay Chat Daemon | + * +------------------------------------+ + * + * InspIRCd: (C) 2002-2009 InspIRCd Development Team + * See: http://wiki.inspircd.org/Credits + * + * This program is free but copyrighted software; see + * the file COPYING for details. + * + * --------------------------------------------------- + */ + +#include "inspircd.h" +#include "xline.h" + +#ifndef WINDOWS +#include +#include +#include +#include +#endif + +/* $ModDesc: Provides handling of DNS blacklists */ + +/* Class holding data for a single entry */ +class DNSBLConfEntry : public classbase +{ + public: + enum EnumBanaction { I_UNKNOWN, I_KILL, I_ZLINE, I_KLINE, I_GLINE }; + enum EnumType { A_RECORD, A_BITMASK }; + std::string name, domain, reason; + EnumBanaction banaction; + EnumType type; + long duration; + int bitmask; + unsigned char records[256]; + unsigned long stats_hits, stats_misses; + DNSBLConfEntry(): type(A_BITMASK),duration(86400),bitmask(0),stats_hits(0), stats_misses(0) {} + ~DNSBLConfEntry() { } +}; + + +/** Resolver for CGI:IRC hostnames encoded in ident/GECOS + */ +class DNSBLResolver : public Resolver +{ + int theirfd; + User* them; + DNSBLConfEntry *ConfEntry; + + public: + + DNSBLResolver(Module *me, InspIRCd *Instance, const std::string &hostname, User* u, int userfd, DNSBLConfEntry *conf, bool &cached) + : Resolver(Instance, hostname, DNS_QUERY_A, cached, me) + { + theirfd = userfd; + them = u; + ConfEntry = conf; + } + + /* Note: This may be called multiple times for multiple A record results */ + virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached) + { + /* Check the user still exists */ + if ((them) && (them == ServerInstance->SE->GetRef(theirfd))) + { + // Now we calculate the bitmask: 256*(256*(256*a+b)+c)+d + if(result.length()) + { + unsigned int bitmask = 0, record = 0; + bool match = false; + in_addr resultip; + + inet_aton(result.c_str(), &resultip); + + switch (ConfEntry->type) + { + case DNSBLConfEntry::A_BITMASK: + bitmask = resultip.s_addr >> 24; /* Last octet (network byte order) */ + bitmask &= ConfEntry->bitmask; + match = (bitmask != 0); + break; + case DNSBLConfEntry::A_RECORD: + record = resultip.s_addr >> 24; /* Last octet */ + match = (ConfEntry->records[record] == 1); + break; + } + + if (match) + { + std::string reason = ConfEntry->reason; + std::string::size_type x = reason.find("%ip%"); + while (x != std::string::npos) + { + reason.erase(x, 4); + reason.insert(x, them->GetIPString()); + x = reason.find("%ip%"); + } + + ConfEntry->stats_hits++; + + switch (ConfEntry->banaction) + { + case DNSBLConfEntry::I_KILL: + { + ServerInstance->Users->QuitUser(them, std::string("Killed (") + reason + ")"); + break; + } + case DNSBLConfEntry::I_KLINE: + { + KLine* kl = new KLine(ServerInstance, ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName, reason.c_str(), + "*", them->GetIPString()); + if (ServerInstance->XLines->AddLine(kl,NULL)) + { + ServerInstance->SNO->WriteToSnoMask('x',"m_dnsbl added K:line on *@%s to expire on %s (%s).", + them->GetIPString(), ServerInstance->TimeString(kl->expiry).c_str(), reason.c_str()); + ServerInstance->XLines->ApplyLines(); + } + else + delete kl; + break; + } + case DNSBLConfEntry::I_GLINE: + { + GLine* gl = new GLine(ServerInstance, ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName, reason.c_str(), + "*", them->GetIPString()); + if (ServerInstance->XLines->AddLine(gl,NULL)) + { + ServerInstance->SNO->WriteToSnoMask('x',"m_dnsbl added G:line on *@%s to expire on %s (%s).", + them->GetIPString(), ServerInstance->TimeString(gl->expiry).c_str(), reason.c_str()); + ServerInstance->XLines->ApplyLines(); + } + else + delete gl; + break; + } + case DNSBLConfEntry::I_ZLINE: + { + ZLine* zl = new ZLine(ServerInstance, ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName, reason.c_str(), + them->GetIPString()); + if (ServerInstance->XLines->AddLine(zl,NULL)) + { + ServerInstance->SNO->WriteToSnoMask('x',"m_dnsbl added Z:line on *@%s to expire on %s (%s).", + them->GetIPString(), ServerInstance->TimeString(zl->expiry).c_str(), reason.c_str()); + ServerInstance->XLines->ApplyLines(); + } + else + delete zl; + break; + } + case DNSBLConfEntry::I_UNKNOWN: + { + break; + } + break; + } + + ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s detected as being on a DNS blacklist (%s) with result %d", them->GetFullRealHost().c_str(), ConfEntry->name.c_str(), (ConfEntry->type==DNSBLConfEntry::A_BITMASK) ? bitmask : record); + } + else + ConfEntry->stats_misses++; + } + else + ConfEntry->stats_misses++; + } + } + + virtual void OnError(ResolverError e, const std::string &errormessage) + { + } + + virtual ~DNSBLResolver() + { + } +}; + +class ModuleDNSBL : public Module +{ + private: + std::vector DNSBLConfEntries; + + /* + * Convert a string to EnumBanaction + */ + DNSBLConfEntry::EnumBanaction str2banaction(const std::string &action) + { + if(action.compare("KILL")==0) + return DNSBLConfEntry::I_KILL; + if(action.compare("KLINE")==0) + return DNSBLConfEntry::I_KLINE; + if(action.compare("ZLINE")==0) + return DNSBLConfEntry::I_ZLINE; + if(action.compare("GLINE")==0) + return DNSBLConfEntry::I_GLINE; + + return DNSBLConfEntry::I_UNKNOWN; + } + public: + ModuleDNSBL(InspIRCd *Me) : Module(Me) + { + ReadConf(); + Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnStats }; + ServerInstance->Modules->Attach(eventlist, this, 3); + } + + virtual ~ModuleDNSBL() + { + ClearEntries(); + } + + virtual Version GetVersion() + { + return Version("$Id$", VF_VENDOR, API_VERSION); + } + + + /** Clear entries and free the mem it was using + */ + void ClearEntries() + { + for (std::vector::iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); i++) + delete *i; + DNSBLConfEntries.clear(); + } + + /** Fill our conf vector with data + */ + virtual void ReadConf() + { + ConfigReader *MyConf = new ConfigReader(ServerInstance); + ClearEntries(); + + for (int i=0; i< MyConf->Enumerate("dnsbl"); i++) + { + DNSBLConfEntry *e = new DNSBLConfEntry(); + + e->name = MyConf->ReadValue("dnsbl", "name", i); + e->reason = MyConf->ReadValue("dnsbl", "reason", i); + e->domain = MyConf->ReadValue("dnsbl", "domain", i); + + if (MyConf->ReadValue("dnsbl", "type", i) == "bitmask") + { + e->type = DNSBLConfEntry::A_BITMASK; + e->bitmask = MyConf->ReadInteger("dnsbl", "bitmask", i, false); + } + else + { + memset(e->records, 0, sizeof(e->records)); + e->type = DNSBLConfEntry::A_RECORD; + irc::portparser portrange(MyConf->ReadValue("dnsbl", "records", i), false); + long item = -1; + while ((item = portrange.GetToken())) + e->records[item] = 1; + } + + e->banaction = str2banaction(MyConf->ReadValue("dnsbl", "action", i)); + e->duration = ServerInstance->Duration(MyConf->ReadValue("dnsbl", "duration", "60", i)); + + /* Use portparser for record replies */ + + /* yeah, logic here is a little messy */ + if ((e->bitmask <= 0) && (DNSBLConfEntry::A_BITMASK == e->type)) + { + ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): invalid bitmask",i); + } + else if (e->name.empty()) + { + ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): Invalid name",i); + } + else if (e->domain.empty()) + { + ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): Invalid domain",i); + } + else if (e->banaction == DNSBLConfEntry::I_UNKNOWN) + { + ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): Invalid banaction", i); + } + else if (e->duration <= 0) + { + ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): Invalid duration", i); + } + else + { + if (e->reason.empty()) + { + ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): empty reason, using defaults",i); + e->reason = "Your IP has been blacklisted."; + } + + /* add it, all is ok */ + DNSBLConfEntries.push_back(e); + continue; + } + + /* delete and drop it, error somewhere */ + delete e; + } + + delete MyConf; + } + + virtual void OnRehash(User* user) + { + ReadConf(); + } + + virtual int OnUserRegister(User* user) + { + /* only do lookups on local users */ + if (IS_LOCAL(user)) + { + /* following code taken from bopm, reverses an IP address. */ + struct in_addr in; + unsigned char a, b, c, d; + char reversedipbuf[128]; + std::string reversedip; + bool success; + + success = inet_aton(user->GetIPString(), &in); + + if (!success) + return 0; + + d = (unsigned char) (in.s_addr >> 24) & 0xFF; + c = (unsigned char) (in.s_addr >> 16) & 0xFF; + b = (unsigned char) (in.s_addr >> 8) & 0xFF; + a = (unsigned char) in.s_addr & 0xFF; + + snprintf(reversedipbuf, 128, "%d.%d.%d.%d", d, c, b, a); + reversedip = std::string(reversedipbuf); + + // For each DNSBL, we will run through this lookup + for (std::vector::iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); i++) + { + // Fill hostname with a dnsbl style host (d.c.b.a.domain.tld) + std::string hostname = reversedip + "." + (*i)->domain; + + /* now we'd need to fire off lookups for `hostname'. */ + bool cached; + DNSBLResolver *r = new DNSBLResolver(this, ServerInstance, hostname, user, user->GetFd(), *i, cached); + ServerInstance->AddResolver(r, cached); + } + } + + /* don't do anything with this hot potato */ + return 0; + } + + virtual int OnStats(char symbol, User* user, string_list &results) + { + if (symbol != 'd') + return 0; + + unsigned long total_hits = 0, total_misses = 0; + + for (std::vector::iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); i++) + { + total_hits += (*i)->stats_hits; + total_misses += (*i)->stats_misses; + + results.push_back(std::string(ServerInstance->Config->ServerName) + " 304 " + user->nick + " :DNSBLSTATS DNSbl \"" + (*i)->name + "\" had " + + ConvToStr((*i)->stats_hits) + " hits and " + ConvToStr((*i)->stats_misses) + " misses"); + } + + results.push_back(std::string(ServerInstance->Config->ServerName) + " 304 " + user->nick + " :DNSBLSTATS Total hits: " + ConvToStr(total_hits)); + results.push_back(std::string(ServerInstance->Config->ServerName) + " 304 " + user->nick + " :DNSBLSTATS Total misses: " + ConvToStr(total_misses)); + + return 0; + } +}; + +MODULE_INIT(ModuleDNSBL)