-- -- Prosody IM -- Copyright (C) 2010 Waqas Hussain -- Copyright (C) 2010 Jeff Mitchell -- Copyright (C) 2013 Mikael Nordfeldth -- Copyright (C) 2013 Matthew Wild, finally came to fix it all -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- local lpty = assert(require "lpty", "mod_auth_external requires lpty: https://code.google.com/p/prosody-modules/wiki/mod_auth_external#Installation"); local usermanager = require "core.usermanager"; local new_sasl = require "util.sasl".new; local server = require "net.server"; local have_async, async = pcall(require, "util.async"); local log = module._log; local host = module.host; local script_type = module:get_option_string("external_auth_protocol", "generic"); local command = module:get_option_string("external_auth_command", ""); local read_timeout = module:get_option_number("external_auth_timeout", 5); local blocking = module:get_option_boolean("external_auth_blocking", not(have_async and server.event and lpty.getfd)); local auth_processes = module:get_option_number("external_auth_processes", 1); assert(script_type == "ejabberd" or script_type == "generic", "Config error: external_auth_protocol must be 'ejabberd' or 'generic'"); assert(not host:find(":"), "Invalid hostname"); if not blocking then log("debug", "External auth in non-blocking mode, yay!") waiter, guard = async.waiter, async.guarder(); elseif auth_processes > 1 then log("warn", "external_auth_processes is greater than 1, but we are in blocking mode - reducing to 1"); auth_processes = 1; end local ptys = {}; local pty_options = { throw_errors = false, no_local_echo = true, use_path = false }; for i = 1, auth_processes do ptys[i] = lpty.new(pty_options); end local curr_process = 0; function send_query(text) curr_process = (curr_process%auth_processes)+1; local pty = ptys[curr_process]; local finished_with_pty if not blocking then finished_with_pty = guard(pty); -- Prevent others from crossing this line while we're busy end if not pty:hasproc() then local status, ret = pty:exitstatus(); if status and (status ~= "exit" or ret ~= 0) then log("warn", "Auth process exited unexpectedly with %s %d, restarting", status, ret or 0); return nil; end local ok, err = pty:startproc(command); if not ok then log("error", "Failed to start auth process '%s': %s", command, err); return nil; end log("debug", "Started auth process"); end pty:send(text); if blocking then return pty:read(read_timeout); else local response; local wait, done = waiter(); server.addevent(pty:getfd(), server.event.EV_READ, function () response = pty:read(); done(); return -1; end); wait(); finished_with_pty(); return response; end end function do_query(kind, username, password) if not username then return nil, "not-acceptable"; end local query = (password and "%s:%s:%s:%s" or "%s:%s:%s"):format(kind, username, host, password); local len = #query if len > 1000 then return nil, "policy-violation"; end if script_type == "ejabberd" then local lo = len % 256; local hi = (len - lo) / 256; query = string.char(hi, lo)..query; end if script_type == "generic" then query = query..'\n'; end local response, err = send_query(query); if not response then log("warn", "Error while waiting for result from auth process: %s", err or "unknown error"); elseif (script_type == "ejabberd" and response == "\0\2\0\0") or (script_type == "generic" and response:gsub("\r?\n$", "") == "0") then return nil, "not-authorized"; elseif (script_type == "ejabberd" and response == "\0\2\0\1") or (script_type == "generic" and response:gsub("\r?\n$", "") == "1") then return true; else log("warn", "Unable to interpret data from auth process, %s", (response:match("^error:") and response) or ("["..#response.." bytes]")); return nil, "internal-server-error"; end end local host = module.host; local provider = {}; function provider.test_password(username, password) return do_query("auth", username, password); end function provider.set_password(username, password) return do_query("setpass", username, password); end function provider.user_exists(username) return do_query("isuser", username); end function provider.create_user(username, password) return nil, "Account creation/modification not available."; end function provider.get_sasl_handler() local testpass_authentication_profile = { plain_test = function(sasl, username, password, realm) return usermanager.test_password(username, realm, password), true; end, }; return new_sasl(host, testpass_authentication_profile); end module:provides("auth", provider);