/* +------------------------------------+ * | Inspire Internet Relay Chat Daemon | * +------------------------------------+ * * InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev. * E-mail: * * * * Written by Craig Edwards, Craig McLure, and others. * This program is free but copyrighted software; see * the file COPYING for details. * * --------------------------------------------------- */ #include "inspircd_config.h" #include "configreader.h" #include "inspircd.h" #include "users.h" #include "channels.h" #include "modules.h" #include "m_hash.h" /* $ModDesc: Provides masking of user hostnames */ /* $ModDep: m_hash.h */ /* Used to vary the output a little more depending on the cloak keys */ static const char* xtab[] = {"F92E45D871BCA630", "A1B9D80C72E653F4", "1ABC078934DEF562", "ABCDEF5678901234"}; /** Handles user mode +x */ class CloakUser : public ModeHandler { std::string prefix; unsigned int key1; unsigned int key2; unsigned int key3; unsigned int key4; Module* Sender; Module* HashProvider; public: CloakUser(InspIRCd* Instance, Module* Source, Module* Hash) : ModeHandler(Instance, 'x', 0, 0, false, MODETYPE_USER, false), Sender(Source), HashProvider(Hash) { } ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string ¶meter, bool adding) { /* Only opers can change other users modes */ if ((source != dest) && (!*source->oper)) return MODEACTION_DENY; /* For remote clients, we dont take any action, we just allow it. * The local server where they are will set their cloak instead. */ if (!IS_LOCAL(dest)) return MODEACTION_ALLOW; if (adding) { if(!dest->IsModeSet('x')) { /* The mode is being turned on - so attempt to * allocate the user a cloaked host using a non-reversible * algorithm (its simple, but its non-reversible so the * simplicity doesnt really matter). This algorithm * will not work if the user has only one level of domain * naming in their hostname (e.g. if they are on a lan or * are connecting via localhost) -- this doesnt matter much. */ char* n1 = strchr(dest->host,'.'); char* n2 = strchr(dest->host,':'); if (n1 || n2) { /* InspIRCd users have two hostnames; A displayed * hostname which can be modified by modules (e.g. * to create vhosts, implement chghost, etc) and a * 'real' hostname which you shouldnt write to. */ unsigned int iv[] = { key1, key2, key3, key4 }; std::string a = (n1 ? n1 : n2); std::string b; insp_inaddr testaddr; /** Reset the Hash module, and send it our IV and hex table */ HashResetRequest(Sender, HashProvider).Send(); HashKeyRequest(Sender, HashProvider, iv).Send(); HashHexRequest(Sender, HashProvider, xtab[(*dest->host) % 4]); /* Generate a cloak using specialized Hash */ std::string hostcloak = prefix + "-" + std::string(HashSumRequest(Sender, HashProvider, dest->host).Send()).substr(0,8) + a; /* Fix by brain - if the cloaked host is > the max length of a host (64 bytes * according to the DNS RFC) then tough titty, they get cloaked as an IP. * Their ISP shouldnt go to town on subdomains, or they shouldnt have a kiddie * vhost. */ if ((insp_aton(dest->host,&testaddr) < 1) && (hostcloak.length() <= 64)) { // if they have a hostname, make something appropriate b = hostcloak; } else { b = ((b.find(':') == std::string::npos) ? Cloak4(dest->host) : Cloak6(dest->host)); } dest->ChangeDisplayedHost(b.c_str()); } dest->SetMode('x',true); return MODEACTION_ALLOW; } } else { if (dest->IsModeSet('x')) { /* User is removing the mode, so just restore their real host * and make it match the displayed one. */ dest->ChangeDisplayedHost(dest->host); dest->SetMode('x',false); return MODEACTION_ALLOW; } } return MODEACTION_DENY; } std::string Cloak4(const char* ip) { unsigned int iv[] = { key1, key2, key3, key4 }; irc::sepstream seps(ip, '.'); std::string ra[4];; std::string octet[4]; int i[4]; for (int j = 0; j < 4; j++) { octet[j] = seps.GetToken(); i[j] = atoi(octet[j].c_str()); } octet[3] = octet[0] + "." + octet[1] + "." + octet[2] + "." + octet[3]; octet[2] = octet[0] + "." + octet[1] + "." + octet[2]; octet[1] = octet[0] + "." + octet[1]; /* Reset the Hash module and send it our IV */ HashResetRequest(Sender, HashProvider).Send(); HashKeyRequest(Sender, HashProvider, iv).Send(); /* Send the Hash module a different hex table for each octet group's Hash sum */ for (int k = 0; k < 4; k++) { HashHexRequest(Sender, HashProvider, xtab[(iv[k]+i[k]) % 4]).Send(); ra[k] = std::string(HashSumRequest(Sender, HashProvider, octet[k]).Send()).substr(0,6); } /* Stick them all together */ return std::string().append(ra[0]).append(".").append(ra[1]).append(".").append(ra[2]).append(".").append(ra[3]); } std::string Cloak6(const char* ip) { unsigned int iv[] = { key1, key2, key3, key4 }; std::vector hashies; std::string item = ""; int rounds = 0; /* Reset the Hash module and send it our IV */ HashResetRequest(Sender, HashProvider).Send(); HashKeyRequest(Sender, HashProvider, iv).Send(); for (const char* input = ip; *input; input++) { item += *input; if (item.length() > 5) { /* Send the Hash module a different hex table for each octet group's Hash sum */ HashHexRequest(Sender, HashProvider, xtab[(key1+rounds) % 4]).Send(); hashies.push_back(std::string(HashSumRequest(Sender, HashProvider, item).Send()).substr(0,10)); item = ""; } rounds++; } if (!item.empty()) { /* Send the Hash module a different hex table for each octet group's Hash sum */ HashHexRequest(Sender, HashProvider, xtab[(key1+rounds) % 4]).Send(); hashies.push_back(std::string(HashSumRequest(Sender, HashProvider, item).Send()).substr(0,10)); item = ""; } /* Stick them all together */ return irc::stringjoiner(":", hashies, 0, hashies.size() - 1).GetJoined(); } void DoRehash() { ConfigReader Conf(ServerInstance); key1 = key2 = key3 = key4 = 0; key1 = Conf.ReadInteger("cloak","key1",0,true); key2 = Conf.ReadInteger("cloak","key2",0,true); key3 = Conf.ReadInteger("cloak","key3",0,true); key4 = Conf.ReadInteger("cloak","key4",0,true); prefix = Conf.ReadValue("cloak","prefix",0); if (prefix.empty()) prefix = ServerInstance->Config->Network; if (!key1 && !key2 && !key3 && !key4) throw ModuleException("You have not defined cloak keys for m_cloaking!!! THIS IS INSECURE AND SHOULD BE CHECKED!"); } }; class ModuleCloaking : public Module { private: CloakUser* cu; Module* HashModule; public: ModuleCloaking(InspIRCd* Me) : Module::Module(Me) { /* Attempt to locate the Hash service provider, bail if we can't find it */ HashModule = ServerInstance->FindModule("m_md5.so"); if (!HashModule) throw ModuleException("Can't find m_md5.so. Please load m_md5.so before m_cloaking.so."); /* Create new mode handler object */ cu = new CloakUser(ServerInstance, this, HashModule); /* Register it with the core */ ServerInstance->AddMode(cu, 'x'); OnRehash(""); } virtual ~ModuleCloaking() { ServerInstance->Modes->DelMode(cu); DELETE(cu); } virtual Version GetVersion() { // returns the version number of the module to be // listed in /MODULES return Version(1,1,0,2,VF_COMMON|VF_VENDOR,API_VERSION); } virtual void OnRehash(const std::string ¶meter) { cu->DoRehash(); } void Implements(char* List) { List[I_OnRehash] = 1; } }; // stuff down here is the module-factory stuff. For basic modules you can ignore this. class ModuleCloakingFactory : public ModuleFactory { public: ModuleCloakingFactory() { } ~ModuleCloakingFactory() { } virtual Module * CreateModule(InspIRCd* Me) { return new ModuleCloaking(Me); } }; extern "C" void * init_module( void ) { return new ModuleCloakingFactory; }