/* * InspIRCd -- Internet Relay Chat Daemon * * Copyright (C) 2009-2010 Daniel De Graaf * Copyright (C) 2007-2008 John Brooks * Copyright (C) 2008 Pippijn van Steenhoven * Copyright (C) 2006-2008 Craig Edwards * Copyright (C) 2007 Robin Burchell * Copyright (C) 2007 Dennis Friis * Copyright (C) 2006 Oliver Lupton * * This file is part of InspIRCd. InspIRCd is free software: you can * redistribute it and/or modify it under the terms of the GNU General Public * License as published by the Free Software Foundation, version 2. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include "inspircd.h" #include "xline.h" #include "modules/dns.h" enum CGItype { IDENT, WEBIRC }; // We need this method up here so that it can be accessed from anywhere static void ChangeIP(User* user, const std::string& newip) { ServerInstance->Users->RemoveCloneCounts(user); user->SetClientIP(newip.c_str()); ServerInstance->Users->AddClone(user); } /** Holds a CGI site's details */ class CGIhost { public: std::string hostmask; CGItype type; std::string password; CGIhost(const std::string &mask, CGItype t, const std::string &spassword) : hostmask(mask), type(t), password(spassword) { } }; typedef std::vector CGIHostlist; /* * WEBIRC * This is used for the webirc method of CGIIRC auth, and is (really) the best way to do these things. * Syntax: WEBIRC password gateway hostname ip * Where password is a shared key, gateway is the name of the WebIRC gateway and version (e.g. cgiirc), hostname * is the resolved host of the client issuing the command and IP is the real IP of the client. * * How it works: * To tie in with the rest of cgiirc module, and to avoid race conditions, /webirc is only processed locally * and simply sets metadata on the user, which is later decoded on full connect to give something meaningful. */ class CommandWebirc : public Command { public: bool notify; StringExtItem gateway; StringExtItem realhost; StringExtItem realip; CGIHostlist Hosts; CommandWebirc(Module* Creator) : Command(Creator, "WEBIRC", 4) , gateway("cgiirc_gateway", ExtensionItem::EXT_USER, Creator) , realhost("cgiirc_realhost", ExtensionItem::EXT_USER, Creator) , realip("cgiirc_realip", ExtensionItem::EXT_USER, Creator) { allow_empty_last_param = false; works_before_reg = true; this->syntax = "password gateway hostname ip"; } CmdResult Handle(const std::vector ¶meters, User *user) { if(user->registered == REG_ALL) return CMD_FAILURE; irc::sockets::sockaddrs ipaddr; if (!irc::sockets::aptosa(parameters[3], 0, ipaddr)) { IS_LOCAL(user)->CommandFloodPenalty += 5000; ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s tried to use WEBIRC but gave an invalid IP address.", user->GetFullRealHost().c_str()); return CMD_FAILURE; } for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++) { if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map)) { if(iter->type == WEBIRC && parameters[0] == iter->password) { gateway.set(user, parameters[1]); realhost.set(user, user->host); realip.set(user, user->GetIPString()); // Check if we're happy with the provided hostname. If it's problematic then make sure we won't set a host later, just the IP bool host_ok = (parameters[2].length() <= ServerInstance->Config->Limits.MaxHost); const std::string& newhost = (host_ok ? parameters[2] : parameters[3]); if (notify) ServerInstance->SNO->WriteGlobalSno('w', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from %s", user->nick.c_str(), user->host.c_str(), newhost.c_str(), user->host.c_str()); // Where the magic happens - change their IP ChangeIP(user, parameters[3]); // And follow this up by changing their host user->host = user->dhost = newhost; user->InvalidateCache(); return CMD_SUCCESS; } } } IS_LOCAL(user)->CommandFloodPenalty += 5000; ServerInstance->SNO->WriteGlobalSno('w', "Connecting user %s tried to use WEBIRC, but didn't match any configured webirc blocks.", user->GetFullRealHost().c_str()); return CMD_FAILURE; } }; /** Resolver for CGI:IRC hostnames encoded in ident/GECOS */ class CGIResolver : public DNS::Request { std::string theiruid; LocalIntExt& waiting; bool notify; public: CGIResolver(DNS::Manager* mgr, Module* me, bool NotifyOpers, const std::string &source, LocalUser* u, LocalIntExt& ext) : DNS::Request(mgr, me, source, DNS::QUERY_PTR) , theiruid(u->uuid) , waiting(ext) , notify(NotifyOpers) { } void OnLookupComplete(const DNS::Query *r) CXX11_OVERRIDE { /* Check the user still exists */ User* them = ServerInstance->FindUUID(theiruid); if ((them) && (!them->quitting)) { LocalUser* lu = IS_LOCAL(them); if (!lu) return; const DNS::ResourceRecord &ans_record = r->answers[0]; if (ans_record.rdata.empty() || ans_record.rdata.length() > ServerInstance->Config->Limits.MaxHost) return; if (notify) ServerInstance->SNO->WriteGlobalSno('w', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s", them->nick.c_str(), them->host.c_str(), ans_record.rdata.c_str()); them->host = them->dhost = ans_record.rdata; them->InvalidateCache(); lu->CheckLines(true); } } void OnError(const DNS::Query *r) CXX11_OVERRIDE { if (!notify) return; User* them = ServerInstance->FindUUID(theiruid); if ((them) && (!them->quitting)) { ServerInstance->SNO->WriteToSnoMask('w', "Connecting user %s detected as using CGI:IRC (%s), but their host can't be resolved!", them->nick.c_str(), them->host.c_str()); } } ~CGIResolver() { User* them = ServerInstance->FindUUID(theiruid); if (!them) return; int count = waiting.get(them); if (count) waiting.set(them, count - 1); } }; class ModuleCgiIRC : public Module { CommandWebirc cmd; LocalIntExt waiting; dynamic_reference DNS; static void RecheckClass(LocalUser* user) { user->MyClass = NULL; user->SetClass(); user->CheckClass(); } void HandleIdent(LocalUser* user, const std::string& newip) { cmd.realhost.set(user, user->host); cmd.realip.set(user, user->GetIPString()); ChangeIP(user, newip); user->host = user->dhost = user->GetIPString(); user->InvalidateCache(); RecheckClass(user); // Don't create the resolver if the core couldn't put the user in a connect class or when dns is disabled if (user->quitting || !DNS || !user->MyClass->resolvehostnames) return; CGIResolver* r = new CGIResolver(*this->DNS, this, cmd.notify, newip, user, waiting); try { waiting.set(user, waiting.get(user) + 1); this->DNS->Process(r); } catch (DNS::Exception &ex) { int count = waiting.get(user); if (count) waiting.set(user, count - 1); delete r; if (cmd.notify) ServerInstance->SNO->WriteToSnoMask('w', "Connecting user %s detected as using CGI:IRC (%s), but I could not resolve their hostname; %s", user->nick.c_str(), user->host.c_str(), ex.GetReason().c_str()); } } public: ModuleCgiIRC() : cmd(this) , waiting("cgiirc-delay", ExtensionItem::EXT_USER, this) , DNS(this, "DNS") { } void init() CXX11_OVERRIDE { ServerInstance->SNO->EnableSnomask('w', "CGIIRC"); } void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE { cmd.Hosts.clear(); // Do we send an oper notice when a CGI:IRC has their host changed? cmd.notify = ServerInstance->Config->ConfValue("cgiirc")->getBool("opernotice", true); ConfigTagList tags = ServerInstance->Config->ConfTags("cgihost"); for (ConfigIter i = tags.first; i != tags.second; ++i) { ConfigTag* tag = i->second; std::string hostmask = tag->getString("mask"); // An allowed CGI:IRC host std::string type = tag->getString("type"); // What type of user-munging we do on this host. std::string password = tag->getString("password"); if(hostmask.length()) { if (type == "webirc" && password.empty()) { ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Missing password in config: %s", hostmask.c_str()); } else { CGItype cgitype; if (type == "ident") cgitype = IDENT; else if (type == "webirc") cgitype = WEBIRC; else { cgitype = IDENT; ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Invalid value in config: %s, setting it to \"ident\"", type.c_str()); } cmd.Hosts.push_back(CGIhost(hostmask, cgitype, password)); } } else { ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Invalid value in config: %s", hostmask.c_str()); continue; } } } ModResult OnCheckReady(LocalUser *user) CXX11_OVERRIDE { if (waiting.get(user)) return MOD_RES_DENY; if (!cmd.realip.get(user)) return MOD_RES_PASSTHRU; RecheckClass(user); if (user->quitting) return MOD_RES_DENY; user->CheckLines(true); if (user->quitting) return MOD_RES_DENY; return MOD_RES_PASSTHRU; } ModResult OnSetConnectClass(LocalUser* user, ConnectClass* myclass) CXX11_OVERRIDE { // If is not set then we have nothing to do. const std::string webirc = myclass->config->getString("webirc"); if (webirc.empty()) return MOD_RES_PASSTHRU; // If the user is not connecting via a WebIRC gateway then they // cannot match this connect class. const std::string* gateway = cmd.gateway.get(user); if (!gateway) return MOD_RES_DENY; // If the gateway matches the constraint then // allow the check to continue. Otherwise, reject it. return InspIRCd::Match(*gateway, webirc) ? MOD_RES_PASSTHRU : MOD_RES_DENY; } ModResult OnUserRegister(LocalUser* user) CXX11_OVERRIDE { for(CGIHostlist::iterator iter = cmd.Hosts.begin(); iter != cmd.Hosts.end(); iter++) { if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map)) { // Deal with it... if(iter->type == IDENT) { CheckIdent(user); // Nothing on failure. user->CheckLines(true); } else if(iter->type == WEBIRC) { // We don't need to do anything here } return MOD_RES_PASSTHRU; } } return MOD_RES_PASSTHRU; } bool CheckIdent(LocalUser* user) { const char* ident; in_addr newip; if (user->ident.length() == 8) ident = user->ident.c_str(); else if (user->ident.length() == 9 && user->ident[0] == '~') ident = user->ident.c_str() + 1; else return false; errno = 0; unsigned long ipaddr = strtoul(ident, NULL, 16); if (errno) return false; newip.s_addr = htonl(ipaddr); std::string newipstr(inet_ntoa(newip)); user->ident = "~cgiirc"; HandleIdent(user, newipstr); return true; } Version GetVersion() CXX11_OVERRIDE { return Version("Change user's hosts connecting from known CGI:IRC hosts",VF_VENDOR); } }; MODULE_INIT(ModuleCgiIRC)