--- /dev/null
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ * Copyright (C) 2011 Pierre Carrier <pierre@spotify.com>
+ * Copyright (C) 2009-2010 Robin Burchell <robin+git@viroteck.net>
+ * Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
+ * Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
+ * Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
+ * Copyright (C) 2008 Dennis Friis <peavey@inspircd.org>
+ * Copyright (C) 2007 Carsten Valdemar Munk <carsten.munk+inspircd@gmail.com>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "inspircd.h"
+#include "users.h"
+#include "channels.h"
+#include "modules.h"
+
+#include <ldap.h>
+
+#ifdef WINDOWS
+# 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<std::string> 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<std::string>::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<char*>(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 <user>:<password> 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)
projects / user / henk / code / inspircd.git / blobdiff