X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fmodules%2Fm_cloaking.cpp;h=a236300f18404bf623e7ad73a12b738862dd4530;hb=8cebe2878f3878afce6f643d93668155cb26801d;hp=7639b16512b40c317fa62d847d4a600560416187;hpb=e8b5c0d9f9103f84384fe9b0d89301ecbf16c3e6;p=user%2Fhenk%2Fcode%2Finspircd.git diff --git a/src/modules/m_cloaking.cpp b/src/modules/m_cloaking.cpp index 7639b1651..a236300f1 100644 --- a/src/modules/m_cloaking.cpp +++ b/src/modules/m_cloaking.cpp @@ -1,165 +1,435 @@ -// Hostname cloaking (+x mode) module for inspircd. -// version 1.0.0.1 by brain (C. J. Edwards) Mar 2004. -// -// When loaded this module will automatically set the -// +x mode on all connecting clients. -// -// Setting +x on a client causes the module to change the -// dhost entry (displayed host) for each user who has the -// mode, cloaking their host. Unlike unreal, the algorithm -// is non-reversible as uncloaked hosts are passed along -// the server->server link, and all encoding of hosts is -// done locally on the server by this module. - -#include -#include "users.h" -#include "channels.h" -#include "modules.h" +/* +------------------------------------+ + * | 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 "m_hash.h" /* $ModDesc: Provides masking of user hostnames */ +/* $ModDep: m_hash.h */ -class ModuleCloaking : public Module +/** Handles user mode +x + */ +class CloakUser : public ModeHandler { - private: - - Server *Srv; - public: - ModuleCloaking() - { - // We must create an instance of the Server class to work with - Srv = new Server; - - // we must create a new mode. Set the parameters so the - // mode doesn't require oper, and is a client usermode - // with no parameters (actually, you cant have params for a umode!) - if (!Srv->AddExtendedMode('x',MT_CLIENT,false,0,0)) - { - // we couldn't claim mode x... possibly anther module has it, - // this might become likely to happen if there are a lot of 3rd - // party modules around in the future -- any 3rd party modules - // SHOULD implement a system of configurable mode letters (e.g. - // from a config file) - Srv->Log(DEFAULT,"*** m_cloaking: ERROR, failed to allocate user mode +x!"); - printf("Could not claim usermode +x for this module!"); - exit(0); - } - } - - virtual ~ModuleCloaking() + std::string prefix; + unsigned int key1; + unsigned int key2; + unsigned int key3; + unsigned int key4; + bool ipalways; + Module* Sender; + Module* HashProvider; + const char *xtab[4]; + + /** This function takes a domain name string and returns just the last two domain parts, + * or the last domain part if only two are available. Failing that it just returns what it was given. + * + * For example, if it is passed "svn.inspircd.org" it will return ".inspircd.org". + * If it is passed "brainbox.winbot.co.uk" it will return ".co.uk", + * and if it is passed "localhost.localdomain" it will return ".localdomain". + * + * This is used to ensure a significant part of the host is always cloaked (see Bug #216) + */ + std::string LastTwoDomainParts(const std::string &host) { - // not really neccessary, but free it anyway - delete Srv; + int dots = 0; + std::string::size_type splitdot = host.length(); + + for (std::string::size_type x = host.length() - 1; x; --x) + { + if (host[x] == '.') + { + splitdot = x; + dots++; + } + if (dots >= 3) + break; + } + + if (splitdot == host.length()) + return host; + else + return host.substr(splitdot); } - - virtual Version GetVersion() + + CloakUser(InspIRCd* Instance, Module* source, Module* Hash) : ModeHandler(Instance, 'x', 0, 0, false, MODETYPE_USER, false), Sender(source), HashProvider(Hash) { - // returns the version number of the module to be - // listed in /MODULES - return Version(1,0,0,1); - } - - virtual int OnExtendedMode(userrec* user, void* target, char modechar, int type, bool mode_on, string_list ¶ms) - { - // this method is called for any extended mode character. - // all module modes for all modules pass through here - // (unless another module further up the chain claims them) - // so we must be VERY careful to only act upon modes which - // we have claimed ourselves. This is a feature to allow - // modules to 'spy' on extended mode activity if they so wish. - if ((modechar == 'x') && (type == MT_CLIENT)) - { - // OnExtendedMode gives us a void* as the target, we must cast - // it into a userrec* or a chanrec* depending on the value of - // the 'type' parameter (MT_CLIENT or MT_CHANNEL) - userrec* dest = (userrec*)target; - - // we've now determined that this is our mode character... - // is the user adding the mode to their list or removing it? - if (mode_on) + } + + ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string ¶meter, bool adding, bool) + { + /* For remote clients, we dont take any action, we just allow it. + * The local server where they are will set their cloak instead. + * This is fine, as we will recieve it later. + */ + if (!IS_LOCAL(dest)) + { + dest->SetMode('x',adding); + return MODEACTION_ALLOW; + } + + /* don't allow this user to spam modechanges */ + dest->IncreasePenalty(5); + + 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. - if (strstr(dest->host,".")) + /* 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. + */ + + std::string* cloak; + + if (!dest->GetExt("cloaked_host", cloak)) { - // in 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. - std::string a = strstr(dest->host,"."); - char ra[64]; - long seed,s2; - memcpy(&seed,dest->host,sizeof(long)); - memcpy(&s2,a.c_str(),sizeof(long)); - sprintf(ra,"%.8X",seed*s2*strlen(dest->host)); - std::string b = Srv->GetNetworkName() + "-" + ra + a; - Srv->Log(DEBUG,"cloak: allocated "+b); - Srv->ChangeHost(user,b); + /* Force creation of missing cloak */ + Sender->OnUserConnect(dest); + } + if (dest->GetExt("cloaked_host", cloak)) + { + dest->ChangeDisplayedHost(cloak->c_str()); + dest->SetMode('x',true); + return MODEACTION_ALLOW; } } - else - { - // user is removing the mode, so just restore their real host - // and make it match the displayed one. - Srv->ChangeHost(user,user->host); - } - // this mode IS ours, and we have handled it. If we chose not to handle it, - // for example the user cannot cloak as they have a vhost or such, then - // we could return 0 here instead of 1 and the core would not send the mode - // change to the user. - return 1; } else { - // this mode isn't ours, we have to bail and return 0 to not handle it. - return 0; + 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.c_str()); + 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++) + { + seps.GetToken(octet[j]); + 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]); } - virtual void OnUserConnect(userrec* user) + std::string Cloak6(const char* ip) { - // Heres the weird bit. When a user connects we must set +x on them, so - // we're going to use the SendMode method of the Server class to send - // the mode to the client. This is basically the same as sending an - // SAMODE in unreal. Note that to the user it will appear as if they set - // the mode on themselves. - - char* modes[2]; // only two parameters - modes[0] = user->nick; // first parameter is the nick - modes[1] = "+x"; // second parameter is the mode - Srv->SendMode(modes,2,user); // send these, forming the command "MODE +x" + 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() > 7) + { + /* 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(0,8)); + item.clear(); + } + 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(0,8)); + item.clear(); + } + /* Stick them all together */ + return irc::stringjoiner(":", hashies, 0, hashies.size() - 1).GetJoined(); } + void DoRehash() + { + ConfigReader Conf(ServerInstance); + bool lowercase; + + /* These are *not* using the need_positive parameter of ReadInteger - + * that will limit the valid values to only the positive values in a + * signed int. Instead, accept any value that fits into an int and + * cast it to an unsigned int. That will, a bit oddly, give us the full + * spectrum of an unsigned integer. - Special */ + key1 = key2 = key3 = key4 = 0; + key1 = (unsigned int) Conf.ReadInteger("cloak","key1",0,false); + key2 = (unsigned int) Conf.ReadInteger("cloak","key2",0,false); + key3 = (unsigned int) Conf.ReadInteger("cloak","key3",0,false); + key4 = (unsigned int) Conf.ReadInteger("cloak","key4",0,false); + prefix = Conf.ReadValue("cloak","prefix",0); + ipalways = Conf.ReadFlag("cloak", "ipalways", 0); + lowercase = Conf.ReadFlag("cloak", "lowercase", 0); + + if (!lowercase) + { + xtab[0] = "F92E45D871BCA630"; + xtab[1] = "A1B9D80C72E653F4"; + xtab[2] = "1ABC078934DEF562"; + xtab[3] = "ABCDEF5678901234"; + } + else + { + xtab[0] = "f92e45d871bca630"; + xtab[1] = "a1b9d80c72e653f4"; + xtab[2] = "1abc078934def562"; + xtab[3] = "abcdef5678901234"; + } + + if (prefix.empty()) + prefix = ServerInstance->Config->Network; + + if (!key1 || !key2 || !key3 || !key4) + { + std::string detail; + if (!key1) + detail = " is not valid, it may be set to a too high/low value, or it may not exist."; + else if (!key2) + detail = " is not valid, it may be set to a too high/low value, or it may not exist."; + else if (!key3) + detail = " is not valid, it may be set to a too high/low value, or it may not exist."; + else if (!key4) + detail = " is not valid, it may be set to a too high/low value, or it may not exist."; + + throw ModuleException("You have not defined cloak keys for m_cloaking!!! THIS IS INSECURE AND SHOULD BE CHECKED! - " + detail); + } + } }; -// stuff down here is the module-factory stuff. For basic modules you can ignore this. -class ModuleCloakingFactory : public ModuleFactory +class ModuleCloaking : public Module { + private: + CloakUser* cu; + public: - ModuleCloakingFactory() + ModuleCloaking(InspIRCd* Me) + : Module(Me) { + /* Attempt to locate the md5 service provider, bail if we can't find it */ + Module* HashModule = ServerInstance->Modules->Find("m_md5.so"); + if (!HashModule) + throw ModuleException("Can't find m_md5.so. Please load m_md5.so before m_cloaking.so."); + + cu = new CloakUser(ServerInstance, this, HashModule); + + try + { + OnRehash(NULL); + } + catch (ModuleException &e) + { + delete cu; + throw e; + } + + /* Register it with the core */ + if (!ServerInstance->Modes->AddMode(cu)) + { + delete cu; + throw ModuleException("Could not add new modes!"); + } + + ServerInstance->Modules->UseInterface("HashRequest"); + + Implementation eventlist[] = { I_OnRehash, I_OnUserDisconnect, I_OnCleanup, I_OnCheckBan, I_OnUserConnect, I_OnSyncUserMetaData, I_OnCleanup }; + ServerInstance->Modules->Attach(eventlist, this, 6); + + CloakExistingUsers(); } - - ~ModuleCloakingFactory() + + void OnSyncUserMetaData(User* user, Module* proto,void* opaque, const std::string &extname, bool displayable) { + if ((displayable) && (extname == "cloaked_host")) + { + std::string* cloak; + if (user->GetExt("cloaked_host", cloak)) + proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *cloak); + } } - - virtual Module * CreateModule() + + void CloakExistingUsers() { - return new ModuleCloaking; + std::string* cloak; + for (std::vector::iterator u = ServerInstance->Users->local_users.begin(); u != ServerInstance->Users->local_users.end(); u++) + { + if (!(*u)->GetExt("cloaked_host", cloak)) + { + OnUserConnect(*u); + } + } } - -}; + virtual int OnCheckBan(User* user, Channel* chan) + { + char mask[MAXBUF]; + std::string* tofree; + /* Check if they have a cloaked host, but are not using it */ + if (user->GetExt("cloaked_host", tofree) && *tofree != user->dhost) + { + snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), tofree->c_str()); + for (BanList::iterator i = chan->bans.begin(); i != chan->bans.end(); i++) + { + if (InspIRCd::Match(mask,i->data)) + return -1; + } + } + return 0; + } -extern "C" void * init_module( void ) -{ - return new ModuleCloakingFactory; -} + void Prioritize() + { + /* Needs to be after m_banexception etc. */ + ServerInstance->Modules->SetPriority(this, I_OnCheckBan, PRIORITY_LAST); + + /* but before m_conn_umodes, so host is generated ready to apply */ + Module *um = ServerInstance->Modules->Find("m_conn_umodes.so"); + ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_AFTER, &um); + } + + virtual void OnUserDisconnect(User* user) + { + std::string* tofree; + if (user->GetExt("cloaked_host", tofree)) + { + delete tofree; + user->Shrink("cloaked_host"); + } + } + + virtual void OnCleanup(int target_type, void* item) + { + if (target_type == TYPE_USER) + OnUserDisconnect((User*)item); + } + + virtual ~ModuleCloaking() + { + ServerInstance->Modes->DelMode(cu); + delete cu; + ServerInstance->Modules->DoneWithInterface("HashRequest"); + } + + virtual Version GetVersion() + { + // returns the version number of the module to be + // listed in /MODULES + return Version("$Id$", VF_COMMON|VF_VENDOR,API_VERSION); + } + + virtual void OnRehash(User* user) + { + cu->DoRehash(); + } + + virtual void OnUserConnect(User* dest) + { + std::string* tofree; + if (dest->GetExt("cloaked_host", tofree)) + return; + + if (dest->host.find('.') != std::string::npos || dest->host.find(':') != std::string::npos) + { + unsigned int iv[] = { cu->key1, cu->key2, cu->key3, cu->key4 }; + std::string a = cu->LastTwoDomainParts(dest->host); + std::string b; + + /* 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. + */ + + /* 2008/08/18: add which always cloaks + * the IP, for anonymity. --nenolod + */ + if (!cu->ipalways) + { + /** Reset the Hash module, and send it our IV and hex table */ + HashResetRequest(this, cu->HashProvider).Send(); + HashKeyRequest(this, cu->HashProvider, iv).Send(); + HashHexRequest(this, cu->HashProvider, cu->xtab[(dest->host[0]) % 4]); + + /* Generate a cloak using specialized Hash */ + std::string hostcloak = cu->prefix + "-" + std::string(HashSumRequest(this, cu->HashProvider, dest->host.c_str()).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. + */ + std::string testaddr; + int testport; + if (!irc::sockets::satoap(&dest->client_sa, testaddr, testport) && (hostcloak.length() <= 64)) + /* not a valid address, must have been a host, so cloak as a host */ + b = hostcloak; + else if (dest->client_sa.sa.sa_family == AF_INET6) + b = cu->Cloak6(dest->GetIPString()); + else + b = cu->Cloak4(dest->GetIPString()); + } + else + { + if (dest->client_sa.sa.sa_family == AF_INET6) + b = cu->Cloak6(dest->GetIPString()); + else + b = cu->Cloak4(dest->GetIPString()); + } + + dest->Extend("cloaked_host", new std::string(b)); + } + } + +}; +MODULE_INIT(ModuleCloaking)