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-rw-r--r--src/modules/m_dnsbl.cpp347
1 files changed, 347 insertions, 0 deletions
diff --git a/src/modules/m_dnsbl.cpp b/src/modules/m_dnsbl.cpp
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index 000000000..4c217fc3e
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+++ b/src/modules/m_dnsbl.cpp
@@ -0,0 +1,347 @@
+/*
+ * Formerly written and maintained by satmd.
+ * This version written and maintained by w00t.
+ */
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <stdint.h>
+#include "inspircd.h"
+#include "dns.h"
+#include "users.h"
+#include "channels.h"
+#include "modules.h"
+
+/* $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;
+ DNSBLConfEntry(): duration(86400),bitmask(0) {}
+};
+
+
+/** 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)
+ : Resolver(ServerInstance, hostname, DNS_QUERY_A, me)
+ {
+ theirfd = userfd;
+ them = u;
+ ConfEntry = conf;
+ }
+
+ virtual void OnLookupComplete(const std::string &result)
+ {
+ /* Check the user still exists */
+ if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
+ {
+ ServerInstance->Log(DEBUG, "m_dnsbl: %s got a result from dnsbl %s", them->nick, ConfEntry->name.c_str());
+
+ // Now we calculate the bitmask: 256*(256*(256*a+b)+c)+d
+ if(result.length())
+ {
+ unsigned int bitmask=0;
+ unsigned int octetpos=0;
+ std::string tmp = result;
+
+ while(tmp.length()>0)
+ {
+ std::string octet;
+ unsigned int lastdot = tmp.rfind(".");
+
+ if (lastdot == std::string::npos)
+ {
+ octet=tmp;
+ tmp.clear();
+ }
+ else
+ {
+ octet=tmp.substr(lastdot+1,tmp.length()-lastdot+1);
+ tmp.resize(lastdot);
+ }
+
+ bitmask += (256 ^ octetpos) * atoi(octet.c_str());
+ octetpos += 1;
+ }
+
+ bitmask &= ConfEntry->bitmask;
+
+ if (bitmask != 0)
+ {
+ std::string reason = ConfEntry->reason;
+
+ while (int pos = reason.find("%ip%") != std::string::npos)
+ {
+ reason.replace(pos, 4, them->GetIPString());
+ }
+
+ ServerInstance->WriteOpers("*** Connecting user %s detected as being on a DNS blacklist (%s) with result %d", them->GetFullRealHost(), ConfEntry->name.c_str(), bitmask);
+
+ switch (ConfEntry->banaction)
+ {
+ case DNSBLConfEntry::I_KILL:
+ {
+ them->QuitUser(ServerInstance, them, std::string("Killed (") + reason + ")");
+ break;
+ }
+ case DNSBLConfEntry::I_KLINE:
+ {
+ ServerInstance->AddKLine(ConfEntry->duration, ServerInstance->Config->ServerName, reason, std::string("*@") + them->GetIPString());
+ break;
+ }
+ case DNSBLConfEntry::I_GLINE:
+ {
+ ServerInstance->AddGLine(ConfEntry->duration, ServerInstance->Config->ServerName, reason, std::string("*@") + them->GetIPString());
+ break;
+ }
+ case DNSBLConfEntry::I_ZLINE:
+ {
+ ServerInstance->AddZLine(ConfEntry->duration, ServerInstance->Config->ServerName, reason, them->GetIPString());
+ break;
+ }
+ case DNSBLConfEntry::I_UNKNOWN:
+ {
+ break;
+ }
+ break;
+ }
+ }
+ }
+ }
+ }
+
+ virtual void OnError(ResolverError e, const std::string &errormessage)
+ {
+ /*
+ this just means they don't appear in the respective dnsbl
+ if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
+ {
+ }
+ */
+ /* Check the user still exists */
+ if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
+ {
+ ServerInstance->Log(DEBUG, "m_dnsbl: %s got an error while resolving for dnsbl %s", them->nick, ConfEntry->name.c_str());
+ }
+ }
+
+ virtual ~DNSBLResolver()
+ {
+ }
+};
+
+class ModuleDNSBL : public Module
+{
+ private:
+ std::vector<DNSBLConfEntry *> 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::Module(Me)
+ {
+ ReadConf();
+ }
+
+ virtual ~ModuleDNSBL()
+ {
+ }
+
+ virtual Version GetVersion()
+ {
+ return Version(2, 0, 0, 0, 0, API_VERSION);
+ }
+
+ void Implements(char* List)
+ {
+ List[I_OnRehash] = List[I_OnUserRegister] = 1;
+ }
+
+ /*
+ * Fill our conf vector with data
+ */
+ virtual void ReadConf()
+ {
+ ConfigReader *MyConf = new ConfigReader(ServerInstance);
+ DNSBLConfEntries.clear();
+
+ 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).c_str());
+ 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 == "")
+ {
+ ServerInstance->WriteOpers("*** DNSBL(#%d): Invalid name",i);
+ }
+ else if (e->domain == "")
+ {
+ 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 == "")
+ {
+ 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);
+ delete MyConf;
+ return;
+ }
+
+ /* delete and drop it, error somewhere */
+ delete e;
+ }
+
+ delete MyConf;
+ }
+
+
+ virtual void OnRehash(const std::string &parameter)
+ {
+ ReadConf();
+ }
+
+ /*
+ * We will check each user that connects *locally* (userrec::fd>0)
+ */
+ virtual int OnUserRegister(userrec* user)
+ {
+ 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;
+
+ if (!inet_aton(user->GetIPString(), &in))
+ {
+ ServerInstance->WriteOpers("Invalid IP address in m_dnsbl! Bailing check");
+ 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);
+
+/*
+ this is satmd's old code
+ std::string reversedip;
+ std::string userip = user->GetIPString();
+ std::string tempip = userip;
+
+ // reversedip will created in there
+ while (tempip.length()>0)
+ {
+ unsigned int lastdot=tempip.rfind(".");
+ if (lastdot == std::string::npos)
+ {
+ reversedip+=tempip;
+ tempip.clear();
+ }
+ else
+ {
+ reversedip += tempip.substr(lastdot+1,tempip.length()-lastdot+1);
+ reversedip += ".";
+ tempip.resize(lastdot);
+ }
+ }
+*/
+
+ // For each DNSBL, we will run through this lookup
+ for (std::vector<DNSBLConfEntry *>::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;
+
+ ServerInstance->Log(DEBUG, "m_dnsbl: sending %s for resolution", hostname.c_str());
+
+ /* now we'd need to fire off lookups for `hostname'. */
+ DNSBLResolver *r = new DNSBLResolver(this, ServerInstance, hostname, user, user->GetFd(), *i);
+ ServerInstance->AddResolver(r);
+ }
+ }
+
+ /* don't do anything with this hot potato */
+ return 0;
+ }
+};
+
+// stuff down here is the module-factory stuff.
+
+class ModuleDNSBLFactory : public ModuleFactory
+{
+ public:
+ ModuleDNSBLFactory()
+ {
+ }
+
+ ~ModuleDNSBLFactory()
+ {
+ }
+
+ virtual Module *CreateModule(InspIRCd *Me)
+ {
+ return new ModuleDNSBL(Me);
+ }
+
+};
+
+
+extern "C" void * init_module( void )
+{
+ return new ModuleDNSBLFactory;
+}
+
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