X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fmodules%2Fm_dnsbl.cpp;h=a645e2cd16b47d91bb54460cb24db2dce2d2aa5a;hb=f2e3fd5952b23209b084bde4f464e6643c8a00ff;hp=8429eb21b1eea19d67ae7f4cf108193bcd91d4b4;hpb=a5fe50aca04ca554d313e7361c571c6a497a9c4e;p=user%2Fhenk%2Fcode%2Finspircd.git diff --git a/src/modules/m_dnsbl.cpp b/src/modules/m_dnsbl.cpp index 8429eb21b..a645e2cd1 100644 --- a/src/modules/m_dnsbl.cpp +++ b/src/modules/m_dnsbl.cpp @@ -23,11 +23,11 @@ #include "inspircd.h" #include "xline.h" - -/* $ModDesc: Provides handling of DNS blacklists */ +#include "modules/dns.h" +#include "modules/stats.h" /* Class holding data for a single entry */ -class DNSBLConfEntry +class DNSBLConfEntry : public refcountbase { public: enum EnumBanaction { I_UNKNOWN, I_KILL, I_ZLINE, I_KLINE, I_GLINE, I_MARK }; @@ -35,176 +35,205 @@ class DNSBLConfEntry std::string name, ident, host, domain, reason; EnumBanaction banaction; EnumType type; - long duration; - int bitmask; + unsigned long duration; + unsigned 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) {} }; -/** Resolver for CGI:IRC hostnames encoded in ident/GECOS +/** Resolver for CGI:IRC hostnames encoded in ident/real name */ -class DNSBLResolver : public Resolver +class DNSBLResolver : public DNS::Request { std::string theiruid; LocalStringExt& nameExt; LocalIntExt& countExt; - DNSBLConfEntry *ConfEntry; + reference ConfEntry; public: - DNSBLResolver(Module *me, LocalStringExt& match, LocalIntExt& ctr, const std::string &hostname, LocalUser* u, DNSBLConfEntry *conf, bool &cached) - : Resolver(hostname, DNS_QUERY_A, cached, me), theiruid(u->uuid), nameExt(match), countExt(ctr), ConfEntry(conf) + DNSBLResolver(DNS::Manager *mgr, Module *me, LocalStringExt& match, LocalIntExt& ctr, const std::string &hostname, LocalUser* u, reference conf) + : DNS::Request(mgr, me, hostname, DNS::QUERY_A, true), theiruid(u->uuid), nameExt(match), countExt(ctr), 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) + void OnLookupComplete(const DNS::Query *r) CXX11_OVERRIDE { /* Check the user still exists */ LocalUser* them = (LocalUser*)ServerInstance->FindUUID(theiruid); - if (them) + if (!them) + return; + + const DNS::ResourceRecord* const ans_record = r->FindAnswerOfType(DNS::QUERY_A); + if (!ans_record) + return; + + // All replies should be in 127.0.0.0/8 + if (ans_record->rdata.compare(0, 4, "127.") != 0) + { + ServerInstance->SNO->WriteGlobalSno('d', "DNSBL: %s returned address outside of acceptable subnet 127.0.0.0/8: %s", ConfEntry->domain.c_str(), ans_record->rdata.c_str()); + ConfEntry->stats_misses++; + return; + } + + int i = countExt.get(them); + if (i) + countExt.set(them, i - 1); + + // Now we calculate the bitmask: 256*(256*(256*a+b)+c)+d + + unsigned int bitmask = 0, record = 0; + bool match = false; + in_addr resultip; + + inet_pton(AF_INET, ans_record->rdata.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) { - int i = countExt.get(them); - if (i) - countExt.set(them, i - 1); - // Now we calculate the bitmask: 256*(256*(256*a+b)+c)+d - if(result.length()) + std::string reason = ConfEntry->reason; + std::string::size_type x = reason.find("%ip%"); + while (x != std::string::npos) { - unsigned int bitmask = 0, record = 0; - bool match = false; - in_addr resultip; + reason.erase(x, 4); + reason.insert(x, them->GetIPString()); + x = reason.find("%ip%"); + } - inet_aton(result.c_str(), &resultip); + ConfEntry->stats_hits++; - switch (ConfEntry->type) + switch (ConfEntry->banaction) + { + case DNSBLConfEntry::I_KILL: { - 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); + ServerInstance->Users->QuitUser(them, "Killed (" + reason + ")"); break; } - - if (match) + case DNSBLConfEntry::I_MARK: { - std::string reason = ConfEntry->reason; - std::string::size_type x = reason.find("%ip%"); - while (x != std::string::npos) + if (!ConfEntry->ident.empty()) { - reason.erase(x, 4); - reason.insert(x, them->GetIPString()); - x = reason.find("%ip%"); + them->WriteNotice("Your ident has been set to " + ConfEntry->ident + " because you matched " + reason); + them->ChangeIdent(ConfEntry->ident); } - ConfEntry->stats_hits++; - - switch (ConfEntry->banaction) + if (!ConfEntry->host.empty()) { - case DNSBLConfEntry::I_KILL: - { - ServerInstance->Users->QuitUser(them, "Killed (" + reason + ")"); - break; - } - case DNSBLConfEntry::I_MARK: - { - if (!ConfEntry->ident.empty()) - { - them->WriteServ("304 " + them->nick + " :Your ident has been set to " + ConfEntry->ident + " because you matched " + reason); - them->ChangeIdent(ConfEntry->ident.c_str()); - } - - if (!ConfEntry->host.empty()) - { - them->WriteServ("304 " + them->nick + " :Your host has been set to " + ConfEntry->host + " because you matched " + reason); - them->ChangeDisplayedHost(ConfEntry->host.c_str()); - } - - nameExt.set(them, ConfEntry->name); - break; - } - case DNSBLConfEntry::I_KLINE: - { - KLine* kl = new KLine(ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName.c_str(), reason.c_str(), - "*", them->GetIPString()); - if (ServerInstance->XLines->AddLine(kl,NULL)) - { - std::string timestr = ServerInstance->TimeString(kl->expiry); - ServerInstance->SNO->WriteGlobalSno('x',"K:line added due to DNSBL match on *@%s to expire on %s: %s", - them->GetIPString().c_str(), timestr.c_str(), reason.c_str()); - ServerInstance->XLines->ApplyLines(); - } - else - delete kl; - break; - } - case DNSBLConfEntry::I_GLINE: - { - GLine* gl = new GLine(ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName.c_str(), reason.c_str(), - "*", them->GetIPString()); - if (ServerInstance->XLines->AddLine(gl,NULL)) - { - std::string timestr = ServerInstance->TimeString(gl->expiry); - ServerInstance->SNO->WriteGlobalSno('x',"G:line added due to DNSBL match on *@%s to expire on %s: %s", - them->GetIPString().c_str(), timestr.c_str(), reason.c_str()); - ServerInstance->XLines->ApplyLines(); - } - else - delete gl; - break; - } - case DNSBLConfEntry::I_ZLINE: - { - ZLine* zl = new ZLine(ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName.c_str(), reason.c_str(), - them->GetIPString()); - if (ServerInstance->XLines->AddLine(zl,NULL)) - { - std::string timestr = ServerInstance->TimeString(zl->expiry); - ServerInstance->SNO->WriteGlobalSno('x',"Z:line added due to DNSBL match on *@%s to expire on %s: %s", - them->GetIPString().c_str(), timestr.c_str(), reason.c_str()); - ServerInstance->XLines->ApplyLines(); - } - else - delete zl; - break; - } - case DNSBLConfEntry::I_UNKNOWN: - { - break; - } - break; + them->WriteNotice("Your host has been set to " + ConfEntry->host + " because you matched " + reason); + them->ChangeDisplayedHost(ConfEntry->host); } - ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s%s detected as being on a DNS blacklist (%s) with result %d", them->nick.empty() ? "" : "", them->GetFullRealHost().c_str(), ConfEntry->domain.c_str(), (ConfEntry->type==DNSBLConfEntry::A_BITMASK) ? bitmask : record); + nameExt.set(them, ConfEntry->name); + break; + } + case DNSBLConfEntry::I_KLINE: + { + KLine* kl = new KLine(ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName.c_str(), reason.c_str(), + "*", them->GetIPString()); + if (ServerInstance->XLines->AddLine(kl,NULL)) + { + std::string timestr = InspIRCd::TimeString(kl->expiry); + ServerInstance->SNO->WriteGlobalSno('x', "K-line added due to DNSBL match on *@%s to expire on %s: %s", + them->GetIPString().c_str(), timestr.c_str(), reason.c_str()); + ServerInstance->XLines->ApplyLines(); + } + else + { + delete kl; + return; + } + break; + } + case DNSBLConfEntry::I_GLINE: + { + GLine* gl = new GLine(ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName.c_str(), reason.c_str(), + "*", them->GetIPString()); + if (ServerInstance->XLines->AddLine(gl,NULL)) + { + std::string timestr = InspIRCd::TimeString(gl->expiry); + ServerInstance->SNO->WriteGlobalSno('x', "G-line added due to DNSBL match on *@%s to expire on %s: %s", + them->GetIPString().c_str(), timestr.c_str(), reason.c_str()); + ServerInstance->XLines->ApplyLines(); + } + else + { + delete gl; + return; + } + break; } - else - ConfEntry->stats_misses++; + case DNSBLConfEntry::I_ZLINE: + { + ZLine* zl = new ZLine(ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName.c_str(), reason.c_str(), + them->GetIPString()); + if (ServerInstance->XLines->AddLine(zl,NULL)) + { + std::string timestr = InspIRCd::TimeString(zl->expiry); + ServerInstance->SNO->WriteGlobalSno('x', "Z-line added due to DNSBL match on %s to expire on %s: %s", + them->GetIPString().c_str(), timestr.c_str(), reason.c_str()); + ServerInstance->XLines->ApplyLines(); + } + else + { + delete zl; + return; + } + break; + } + case DNSBLConfEntry::I_UNKNOWN: + default: + break; } - else - ConfEntry->stats_misses++; + + ServerInstance->SNO->WriteGlobalSno('d', "Connecting user %s (%s) detected as being on the '%s' DNS blacklist with result %d", + them->GetFullRealHost().c_str(), them->GetIPString().c_str(), ConfEntry->name.c_str(), (ConfEntry->type==DNSBLConfEntry::A_BITMASK) ? bitmask : record); } + else + ConfEntry->stats_misses++; } - virtual void OnError(ResolverError e, const std::string &errormessage) + void OnError(const DNS::Query *q) CXX11_OVERRIDE { LocalUser* them = (LocalUser*)ServerInstance->FindUUID(theiruid); - if (them) + if (!them) + return; + + int i = countExt.get(them); + if (i) + countExt.set(them, i - 1); + + if (q->error == DNS::ERROR_NO_RECORDS || q->error == DNS::ERROR_DOMAIN_NOT_FOUND) { - int i = countExt.get(them); - if (i) - countExt.set(them, i - 1); + ConfEntry->stats_misses++; + return; } + + ServerInstance->SNO->WriteGlobalSno('d', "An error occurred whilst checking whether %s (%s) is on the '%s' DNS blacklist: %s", + them->GetFullRealHost().c_str(), them->GetIPString().c_str(), ConfEntry->name.c_str(), this->manager->GetErrorStr(q->error).c_str()); } }; -class ModuleDNSBL : public Module +typedef std::vector > DNSBLConfList; + +class ModuleDNSBL : public Module, public Stats::EventListener { - std::vector DNSBLConfEntries; + DNSBLConfList DNSBLConfEntries; + dynamic_reference DNS; LocalStringExt nameExt; LocalIntExt countExt; @@ -227,47 +256,35 @@ class ModuleDNSBL : public Module return DNSBLConfEntry::I_UNKNOWN; } public: - ModuleDNSBL() : nameExt("dnsbl_match", this), countExt("dnsbl_pending", this) { } - - void init() + ModuleDNSBL() + : Stats::EventListener(this) + , DNS(this, "DNS") + , nameExt("dnsbl_match", ExtensionItem::EXT_USER, this) + , countExt("dnsbl_pending", ExtensionItem::EXT_USER, this) { - ReadConf(); - ServerInstance->Modules->AddService(nameExt); - ServerInstance->Modules->AddService(countExt); - Implementation eventlist[] = { I_OnRehash, I_OnSetUserIP, I_OnStats, I_OnSetConnectClass, I_OnCheckReady }; - ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation)); } - virtual ~ModuleDNSBL() + void init() CXX11_OVERRIDE { - ClearEntries(); + ServerInstance->SNO->EnableSnomask('d', "DNSBL"); } - Version GetVersion() + Version GetVersion() CXX11_OVERRIDE { return Version("Provides handling of DNS blacklists", VF_VENDOR); } - /** 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 */ - void ReadConf() + void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE { - ClearEntries(); + DNSBLConfList newentries; ConfigTagList dnsbls = ServerInstance->Config->ConfTags("dnsbl"); for(ConfigIter i = dnsbls.first; i != dnsbls.second; ++i) { ConfigTag* tag = i->second; - DNSBLConfEntry *e = new DNSBLConfEntry(); + reference e = new DNSBLConfEntry(); e->name = tag->getString("name"); e->ident = tag->getString("ident"); @@ -275,10 +292,10 @@ class ModuleDNSBL : public Module e->reason = tag->getString("reason"); e->domain = tag->getString("domain"); - if (tag->getString("type") == "bitmask") + if (stdalgo::string::equalsci(tag->getString("type"), "bitmask")) { e->type = DNSBLConfEntry::A_BITMASK; - e->bitmask = tag->getInt("bitmask"); + e->bitmask = tag->getUInt("bitmask", 0, 0, UINT_MAX); } else { @@ -291,63 +308,51 @@ class ModuleDNSBL : public Module } e->banaction = str2banaction(tag->getString("action")); - e->duration = InspIRCd::Duration(tag->getString("duration", "60")); + e->duration = tag->getDuration("duration", 60, 1); /* Use portparser for record replies */ /* yeah, logic here is a little messy */ if ((e->bitmask <= 0) && (DNSBLConfEntry::A_BITMASK == e->type)) { - std::string location = tag->getTagLocation(); - ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): invalid bitmask", location.c_str()); + throw ModuleException("Invalid at " + tag->getTagLocation()); } else if (e->name.empty()) { - std::string location = tag->getTagLocation(); - ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): Invalid name", location.c_str()); + throw ModuleException("Empty at " + tag->getTagLocation()); } else if (e->domain.empty()) { - std::string location = tag->getTagLocation(); - ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): Invalid domain", location.c_str()); + throw ModuleException("Empty at " + tag->getTagLocation()); } else if (e->banaction == DNSBLConfEntry::I_UNKNOWN) { - std::string location = tag->getTagLocation(); - ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): Invalid banaction", location.c_str()); - } - else if (e->duration <= 0) - { - std::string location = tag->getTagLocation(); - ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): Invalid duration", location.c_str()); + throw ModuleException("Unknown at " + tag->getTagLocation()); } else { if (e->reason.empty()) { std::string location = tag->getTagLocation(); - ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(%s): empty reason, using defaults", location.c_str()); + ServerInstance->SNO->WriteGlobalSno('d', "DNSBL(%s): empty reason, using defaults", location.c_str()); e->reason = "Your IP has been blacklisted."; } /* add it, all is ok */ - DNSBLConfEntries.push_back(e); - continue; + newentries.push_back(e); } - - /* delete and drop it, error somewhere */ - delete e; } - } - void OnRehash(User* user) - { - ReadConf(); + DNSBLConfEntries.swap(newentries); } - void OnSetUserIP(LocalUser* user) + void OnSetUserIP(LocalUser* user) CXX11_OVERRIDE { - if ((user->exempt) || (user->client_sa.sa.sa_family != AF_INET)) + if ((user->exempt) || !DNS) + return; + + // Clients can't be in a DNSBL if they aren't connected via IPv4 or IPv6. + if (user->client_sa.family() != AF_INET && user->client_sa.family() != AF_INET6) return; if (user->MyClass) @@ -356,40 +361,61 @@ class ModuleDNSBL : public Module return; } else - ServerInstance->Logs->Log("m_dnsbl", LOG_DEBUG, "User has no connect class in OnSetUserIP"); + ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "User has no connect class in OnSetUserIP"); - unsigned char a, b, c, d; - char reversedipbuf[128]; std::string reversedip; + if (user->client_sa.family() == AF_INET) + { + unsigned int a, b, c, d; + d = (unsigned int) (user->client_sa.in4.sin_addr.s_addr >> 24) & 0xFF; + c = (unsigned int) (user->client_sa.in4.sin_addr.s_addr >> 16) & 0xFF; + b = (unsigned int) (user->client_sa.in4.sin_addr.s_addr >> 8) & 0xFF; + a = (unsigned int) user->client_sa.in4.sin_addr.s_addr & 0xFF; - d = (unsigned char) (user->client_sa.in4.sin_addr.s_addr >> 24) & 0xFF; - c = (unsigned char) (user->client_sa.in4.sin_addr.s_addr >> 16) & 0xFF; - b = (unsigned char) (user->client_sa.in4.sin_addr.s_addr >> 8) & 0xFF; - a = (unsigned char) user->client_sa.in4.sin_addr.s_addr & 0xFF; + reversedip = ConvToStr(d) + "." + ConvToStr(c) + "." + ConvToStr(b) + "." + ConvToStr(a); + } + else if (user->client_sa.family() == AF_INET6) + { + const unsigned char* ip = user->client_sa.in6.sin6_addr.s6_addr; - snprintf(reversedipbuf, 128, "%d.%d.%d.%d", d, c, b, a); - reversedip = std::string(reversedipbuf); + std::string buf = BinToHex(ip, 16); + for (std::string::const_reverse_iterator it = buf.rbegin(); it != buf.rend(); ++it) + { + reversedip.push_back(*it); + reversedip.push_back('.'); + } + } + else + return; + + ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Reversed IP %s -> %s", user->GetIPString().c_str(), reversedip.c_str()); countExt.set(user, DNSBLConfEntries.size()); // For each DNSBL, we will run through this lookup - unsigned int i = 0; - while (i < DNSBLConfEntries.size()) + for (unsigned i = 0; i < DNSBLConfEntries.size(); ++i) { // Fill hostname with a dnsbl style host (d.c.b.a.domain.tld) std::string hostname = reversedip + "." + DNSBLConfEntries[i]->domain; /* now we'd need to fire off lookups for `hostname'. */ - bool cached; - DNSBLResolver *r = new DNSBLResolver(this, nameExt, countExt, hostname, user, DNSBLConfEntries[i], cached); - ServerInstance->AddResolver(r, cached); + DNSBLResolver *r = new DNSBLResolver(*this->DNS, this, nameExt, countExt, hostname, user, DNSBLConfEntries[i]); + try + { + this->DNS->Process(r); + } + catch (DNS::Exception &ex) + { + delete r; + ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, ex.GetReason()); + } + if (user->quitting) break; - i++; } } - ModResult OnSetConnectClass(LocalUser* user, ConnectClass* myclass) + ModResult OnSetConnectClass(LocalUser* user, ConnectClass* myclass) CXX11_OVERRIDE { std::string dnsbl; if (!myclass->config->readString("dnsbl", dnsbl)) @@ -401,31 +427,31 @@ class ModuleDNSBL : public Module return MOD_RES_DENY; } - ModResult OnCheckReady(LocalUser *user) + ModResult OnCheckReady(LocalUser *user) CXX11_OVERRIDE { if (countExt.get(user)) return MOD_RES_DENY; return MOD_RES_PASSTHRU; } - ModResult OnStats(char symbol, User* user, string_list &results) + ModResult OnStats(Stats::Context& stats) CXX11_OVERRIDE { - if (symbol != 'd') + if (stats.GetSymbol() != 'd') return MOD_RES_PASSTHRU; unsigned long total_hits = 0, total_misses = 0; - for (std::vector::iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); i++) + for (std::vector >::const_iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); ++i) { total_hits += (*i)->stats_hits; total_misses += (*i)->stats_misses; - results.push_back(ServerInstance->Config->ServerName + " 304 " + user->nick + " :DNSBLSTATS DNSbl \"" + (*i)->name + "\" had " + + stats.AddRow(304, "DNSBLSTATS DNSbl \"" + (*i)->name + "\" had " + ConvToStr((*i)->stats_hits) + " hits and " + ConvToStr((*i)->stats_misses) + " misses"); } - results.push_back(ServerInstance->Config->ServerName + " 304 " + user->nick + " :DNSBLSTATS Total hits: " + ConvToStr(total_hits)); - results.push_back(ServerInstance->Config->ServerName + " 304 " + user->nick + " :DNSBLSTATS Total misses: " + ConvToStr(total_misses)); + stats.AddRow(304, "DNSBLSTATS Total hits: " + ConvToStr(total_hits)); + stats.AddRow(304, "DNSBLSTATS Total misses: " + ConvToStr(total_misses)); return MOD_RES_PASSTHRU; }