/* * InspIRCd -- Internet Relay Chat Daemon * * Copyright (C) 2011 Pierre Carrier * Copyright (C) 2009-2010 Robin Burchell * Copyright (C) 2009 Daniel De Graaf * Copyright (C) 2008 Pippijn van Steenhoven * Copyright (C) 2008 Craig Edwards * Copyright (C) 2008 Dennis Friis * Copyright (C) 2007 Carsten Valdemar Munk * * 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 "users.h" #include "channels.h" #include "modules.h" #include #ifdef _WIN32 # pragma comment(lib, "ldap.lib") # pragma comment(lib, "lber.lib") #endif /* $ModDesc: Allow/Deny connections based upon answer from LDAP server */ /* $LinkerFlags: -lldap */ class ModuleLDAPAuth : public Module { LocalIntExt ldapAuthed; std::string base; std::string attribute; std::string ldapserver; std::string allowpattern; std::string killreason; std::string username; std::string password; std::vector whitelistedcidrs; int searchscope; bool verbose; bool useusername; LDAP *conn; public: ModuleLDAPAuth() : ldapAuthed("ldapauth", this) { conn = NULL; } void init() { Implementation eventlist[] = { I_OnCheckReady, I_OnRehash, I_OnUserRegister }; ServerInstance->Modules->Attach(eventlist, this, 3); OnRehash(NULL); } ~ModuleLDAPAuth() { if (conn) ldap_unbind_ext(conn, NULL, NULL); } void OnRehash(User* user) { ConfigReader Conf; whitelistedcidrs.clear(); base = Conf.ReadValue("ldapauth", "baserdn", 0); attribute = Conf.ReadValue("ldapauth", "attribute", 0); ldapserver = Conf.ReadValue("ldapauth", "server", 0); allowpattern = Conf.ReadValue("ldapauth", "allowpattern", 0); killreason = Conf.ReadValue("ldapauth", "killreason", 0); std::string scope = Conf.ReadValue("ldapauth", "searchscope", 0); username = Conf.ReadValue("ldapauth", "binddn", 0); password = Conf.ReadValue("ldapauth", "bindauth", 0); verbose = Conf.ReadFlag("ldapauth", "verbose", 0); /* Set to true if failed connects should be reported to operators */ useusername = Conf.ReadFlag("ldapauth", "userfield", 0); ConfigTagList whitelisttags = ServerInstance->Config->ConfTags("ldapwhitelist"); for (ConfigIter i = whitelisttags.first; i != whitelisttags.second; ++i) { std::string cidr = i->second->getString("cidr"); if (!cidr.empty()) { whitelistedcidrs.push_back(cidr); } } if (scope == "base") searchscope = LDAP_SCOPE_BASE; else if (scope == "onelevel") searchscope = LDAP_SCOPE_ONELEVEL; else searchscope = LDAP_SCOPE_SUBTREE; Connect(); } bool Connect() { if (conn != NULL) ldap_unbind_ext(conn, NULL, NULL); int res, v = LDAP_VERSION3; res = ldap_initialize(&conn, ldapserver.c_str()); if (res != LDAP_SUCCESS) { if (verbose) ServerInstance->SNO->WriteToSnoMask('c', "LDAP connection failed: %s", ldap_err2string(res)); conn = NULL; return false; } res = ldap_set_option(conn, LDAP_OPT_PROTOCOL_VERSION, (void *)&v); if (res != LDAP_SUCCESS) { if (verbose) ServerInstance->SNO->WriteToSnoMask('c', "LDAP set protocol to v3 failed: %s", ldap_err2string(res)); ldap_unbind_ext(conn, NULL, NULL); conn = NULL; return false; } return true; } ModResult OnUserRegister(LocalUser* user) { if ((!allowpattern.empty()) && (InspIRCd::Match(user->nick,allowpattern))) { ldapAuthed.set(user,1); return MOD_RES_PASSTHRU; } for (std::vector::iterator i = whitelistedcidrs.begin(); i != whitelistedcidrs.end(); i++) { if (InspIRCd::MatchCIDR(user->GetIPString(), *i, ascii_case_insensitive_map)) { ldapAuthed.set(user,1); return MOD_RES_PASSTHRU; } } if (!CheckCredentials(user)) { ServerInstance->Users->QuitUser(user, killreason); return MOD_RES_DENY; } return MOD_RES_PASSTHRU; } bool CheckCredentials(LocalUser* user) { if (conn == NULL) if (!Connect()) return false; if (user->password.empty()) { if (verbose) ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (No password provided)", user->nick.c_str(), user->ident.c_str(), user->host.c_str()); return false; } int res; // bind anonymously if no bind DN and authentication are given in the config struct berval cred; cred.bv_val = const_cast(password.c_str()); cred.bv_len = password.length(); if ((res = ldap_sasl_bind_s(conn, username.c_str(), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL)) != LDAP_SUCCESS) { if (res == LDAP_SERVER_DOWN) { // Attempt to reconnect if the connection dropped if (verbose) ServerInstance->SNO->WriteToSnoMask('a', "LDAP server has gone away - reconnecting..."); Connect(); res = ldap_sasl_bind_s(conn, username.c_str(), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL); } if (res != LDAP_SUCCESS) { if (verbose) ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (LDAP bind failed: %s)", user->nick.c_str(), user->ident.c_str(), user->host.c_str(), ldap_err2string(res)); ldap_unbind_ext(conn, NULL, NULL); conn = NULL; return false; } } LDAPMessage *msg, *entry; std::string what = (attribute + "=" + (useusername ? user->ident : user->nick)); if ((res = ldap_search_ext_s(conn, base.c_str(), searchscope, what.c_str(), NULL, 0, NULL, NULL, NULL, 0, &msg)) != LDAP_SUCCESS) { // Do a second search, based on password, if it contains a : // That is, PASS : will work. size_t pos = user->password.find(":"); if (pos != std::string::npos) { std::string cutpassword = user->password.substr(0, pos); res = ldap_search_ext_s(conn, base.c_str(), searchscope, cutpassword.c_str(), NULL, 0, NULL, NULL, NULL, 0, &msg); if (res == LDAP_SUCCESS) { // Trim the user: prefix, leaving just 'pass' for later password check user->password = user->password.substr(pos + 1); } } // It may have found based on user:pass check above. if (res != LDAP_SUCCESS) { if (verbose) ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (LDAP search failed: %s)", user->nick.c_str(), user->ident.c_str(), user->host.c_str(), ldap_err2string(res)); return false; } } if (ldap_count_entries(conn, msg) > 1) { if (verbose) ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (LDAP search returned more than one result: %s)", user->nick.c_str(), user->ident.c_str(), user->host.c_str(), ldap_err2string(res)); ldap_msgfree(msg); return false; } if ((entry = ldap_first_entry(conn, msg)) == NULL) { if (verbose) ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (LDAP search returned no results: %s)", user->nick.c_str(), user->ident.c_str(), user->host.c_str(), ldap_err2string(res)); ldap_msgfree(msg); return false; } cred.bv_val = (char*)user->password.data(); cred.bv_len = user->password.length(); if ((res = ldap_sasl_bind_s(conn, ldap_get_dn(conn, entry), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL)) == LDAP_SUCCESS) { ldap_msgfree(msg); ldapAuthed.set(user,1); return true; } else { if (verbose) ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (%s)", user->nick.c_str(), user->ident.c_str(), user->host.c_str(), ldap_err2string(res)); ldap_msgfree(msg); return false; } } ModResult OnCheckReady(LocalUser* user) { return ldapAuthed.get(user) ? MOD_RES_PASSTHRU : MOD_RES_DENY; } Version GetVersion() { return Version("Allow/Deny connections based upon answer from LDAP server", VF_VENDOR); } }; MODULE_INIT(ModuleLDAPAuth)