-- mod_auth_ldap local new_sasl = require "util.sasl".new; local lualdap = require "lualdap"; local function ldap_filter_escape(s) return (s:gsub("[*()\\%z]", function(c) return ("\\%02x"):format(c:byte()) end)); end -- Config options local ldap_server = module:get_option_string("ldap_server", "localhost"); local ldap_rootdn = module:get_option_string("ldap_rootdn", ""); local ldap_password = module:get_option_string("ldap_password", ""); local ldap_tls = module:get_option_boolean("ldap_tls"); local ldap_scope = module:get_option_string("ldap_scope", "onelevel"); local ldap_filter = module:get_option_string("ldap_filter", "(uid=$user)"):gsub("%%s", "$user", 1); local ldap_base = assert(module:get_option_string("ldap_base"), "ldap_base is a required option for ldap"); local ldap_mode = module:get_option_string("ldap_mode", "bind"); local host = ldap_filter_escape(module:get_option_string("realm", module.host)); -- Initiate connection local ld = nil; module.unload = function() if ld then pcall(ld, ld.close); end end function ldap_search_once(args) if ld == nil then local err; ld, err = lualdap.open_simple(ldap_server, ldap_rootdn, ldap_password, ldap_tls); if not ld then return nil, err, "reconnect"; end end local success, iterator, invariant, initial = pcall(ld.search, ld, args); if not success then ld = nil; return nil, iterator, "search"; end local success, dn, attr = pcall(iterator, invariant, initial); if not success then ld = nil; return success, dn, "iter"; end return dn, attr, "return"; end function ldap_search(args, retry_count) local dn, attr, where; for i=1,1+retry_count do dn, attr, where = ldap_search_once(args); if dn or not(attr) then break; end -- nothing or something found module:log("warn", "LDAP: %s %s (in %s)", tostring(dn), tostring(attr), where); -- otherwise retry end if not dn and attr then module:log("error", "LDAP: %s", tostring(attr)); end return dn, attr; end local function get_user(username) module:log("debug", "get_user(%q)", username); for dn, attr in ld:search({ base = ldap_base; scope = ldap_scope; sizelimit = 1; filter = ldap_filter:gsub("%$(%a+)", { user = ldap_filter_escape(username); host = host; }); }) do return dn, attr; end end local provider = {}; function provider.create_user(username, password) return nil, "Account creation not available with LDAP."; end function provider.user_exists(username) return not not get_user(username); end function provider.set_password(username, password) local dn, attr = get_user(username); if not dn then return nil, attr end if attr.userPassword == password then return true end return ld:modify(dn, { '=', userPassword = password })(); end if ldap_mode == "getpasswd" then function provider.get_password(username) local dn, attr = get_user(username); if dn and attr then return attr.userPassword; end end function provider.test_password(username, password) return provider.get_password(username) == password; end function provider.get_sasl_handler() return new_sasl(module.host, { plain = function(sasl, username) local password = provider.get_password(username); if not password then return "", nil; end return password, true; end }); end elseif ldap_mode == "bind" then local function test_password(userdn, password) return not not lualdap.open_simple(ldap_server, userdn, password, ldap_tls); end function provider.test_password(username, password) local dn = get_user(username); if not dn then return end return test_password(dn, password) end function provider.get_sasl_handler() return new_sasl(module.host, { plain_test = function(sasl, username, password) return provider.test_password(username, password), true; end }); end else module:log("error", "Unsupported ldap_mode %s", tostring(ldap_mode)); end module:provides("auth", provider);