/* * 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 "modules/ssl.h" #include "modules/whois.h" enum { // InspIRCd-specific. RPL_WHOISGATEWAY = 350 }; // 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); ServerInstance->Users->AddClone(user); } // Encapsulates information about a WebIRC host. class WebIRCHost { private: std::string hostmask; std::string fingerprint; std::string password; std::string passhash; public: WebIRCHost(const std::string& mask, const std::string& fp, const std::string& pass, const std::string& hash) : hostmask(mask) , fingerprint(fp) , password(pass) , passhash(hash) { } bool Matches(LocalUser* user, const std::string& pass) const { // Did the user send a valid password? if (!password.empty() && !ServerInstance->PassCompare(user, password, pass, passhash)) return false; // Does the user have a valid fingerprint? const std::string fp = SSLClientCert::GetFingerprint(&user->eh); if (!fingerprint.empty() && fp != fingerprint) return false; // Does the user's hostname match our hostmask? if (InspIRCd::Match(user->GetRealHost(), hostmask, ascii_case_insensitive_map)) return true; // Does the user's IP address match our hostmask? return InspIRCd::MatchCIDR(user->GetIPString(), hostmask, ascii_case_insensitive_map); } }; /* * 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 SplitCommand { public: std::vector hosts; bool notify; StringExtItem gateway; StringExtItem realhost; StringExtItem realip; CommandWebIRC(Module* Creator) : SplitCommand(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 HandleLocal(const std::vector& parameters, LocalUser* user) CXX11_OVERRIDE { if (user->registered == REG_ALL) return CMD_FAILURE; irc::sockets::sockaddrs ipaddr; if (!irc::sockets::aptosa(parameters[3], 0, ipaddr)) { user->CommandFloodPenalty += 5000; WriteLog("Connecting user %s (%s) tried to use WEBIRC but gave an invalid IP address.", user->uuid.c_str(), user->GetIPString().c_str()); return CMD_FAILURE; } for (std::vector::const_iterator iter = hosts.begin(); iter != hosts.end(); ++iter) { // If we don't match the host then skip to the next host. if (!iter->Matches(user, parameters[0])) continue; // The user matched a WebIRC block! gateway.set(user, parameters[1]); realhost.set(user, user->GetRealHost()); realip.set(user, user->GetIPString()); WriteLog("Connecting user %s is using a WebIRC gateway; changing their IP from %s to %s.", user->uuid.c_str(), user->GetIPString().c_str(), parameters[3].c_str()); // Set the IP address sent via WEBIRC. We ignore the hostname and lookup // instead do our own DNS lookups because of unreliable gateways. ChangeIP(user, parameters[3]); return CMD_SUCCESS; } user->CommandFloodPenalty += 5000; WriteLog("Connecting user %s (%s) tried to use WEBIRC but didn't match any configured WebIRC hosts.", user->uuid.c_str(), user->GetIPString().c_str()); return CMD_FAILURE; } void WriteLog(const char* message, ...) CUSTOM_PRINTF(2, 3) { std::string buffer; VAFORMAT(buffer, message, message); // If we are sending a snotice then the message will already be // written to the logfile. if (notify) ServerInstance->SNO->WriteGlobalSno('w', buffer); else ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, buffer); } }; class ModuleCgiIRC : public Module, public Whois::EventListener { CommandWebIRC cmd; std::vector hosts; 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->GetRealHost()); cmd.realip.set(user, user->GetIPString()); cmd.WriteLog("Connecting user %s is using an ident gateway; changing their IP from %s to %s.", user->uuid.c_str(), user->GetIPString().c_str(), newip.c_str()); ChangeIP(user, newip); RecheckClass(user); } public: ModuleCgiIRC() : Whois::EventListener(this) , cmd(this) { } void init() CXX11_OVERRIDE { ServerInstance->SNO->EnableSnomask('w', "CGIIRC"); } void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE { std::vector identhosts; std::vector webirchosts; ConfigTagList tags = ServerInstance->Config->ConfTags("cgihost"); for (ConfigIter i = tags.first; i != tags.second; ++i) { ConfigTag* tag = i->second; // Ensure that we have the parameter. const std::string mask = tag->getString("mask"); if (mask.empty()) throw ModuleException(" is a mandatory field, at " + tag->getTagLocation()); // Determine what lookup type this host uses. const std::string type = tag->getString("type"); if (stdalgo::string::equalsci(type, "ident")) { // The IP address should be looked up from the hex IP address. identhosts.push_back(mask); } else if (stdalgo::string::equalsci(type, "webirc")) { // The IP address will be received via the WEBIRC command. const std::string fingerprint = tag->getString("fingerprint"); const std::string password = tag->getString("password"); // WebIRC blocks require a password. if (fingerprint.empty() && password.empty()) throw ModuleException("When using either the fingerprint or password field is required, at " + tag->getTagLocation()); webirchosts.push_back(WebIRCHost(mask, fingerprint, password, tag->getString("hash"))); } else { throw ModuleException(type + " is an invalid type, at " + tag->getTagLocation()); } } // The host configuration was valid so we can apply it. hosts.swap(identhosts); cmd.hosts.swap(webirchosts); // Do we send an oper notice when a m_cgiirc client has their IP changed? cmd.notify = ServerInstance->Config->ConfValue("cgiirc")->getBool("opernotice", true); } ModResult OnCheckReady(LocalUser *user) CXX11_OVERRIDE { 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 (std::vector::const_iterator iter = hosts.begin(); iter != hosts.end(); ++iter) { if (!InspIRCd::Match(user->GetRealHost(), *iter, ascii_case_insensitive_map) && !InspIRCd::MatchCIDR(user->GetIPString(), *iter, ascii_case_insensitive_map)) continue; CheckIdent(user); // Nothing on failure. user->CheckLines(true); break; } return MOD_RES_PASSTHRU; } void OnWhois(Whois::Context& whois) CXX11_OVERRIDE { if (!whois.IsSelfWhois() && !whois.GetSource()->HasPrivPermission("users/auspex")) return; // If these fields are not set then the client is not using a gateway. const std::string* realhost = cmd.realhost.get(whois.GetTarget()); const std::string* realip = cmd.realip.get(whois.GetTarget()); if (!realhost || !realip) return; const std::string* gateway = cmd.gateway.get(whois.GetTarget()); if (gateway) whois.SendLine(RPL_WHOISGATEWAY, *realhost, *realip, "is connected via the " + *gateway + " WebIRC gateway"); else whois.SendLine(RPL_WHOISGATEWAY, *realhost, *realip, "is connected via an ident gateway"); } 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("Enables forwarding the real IP address of a user from a gateway to the IRC server", VF_VENDOR); } }; MODULE_INIT(ModuleCgiIRC)