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--[[
Session authentication
(c) 2008 Steven Barth <steven@midlink.org>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
$Id$
]]--
--- LuCI session library.
module("luci.sauth", package.seeall)
require("luci.fs")
require("luci.util")
require("luci.sys")
require("luci.config")
local nixio = require "nixio", require "nixio.util"
local fs = require "nixio.fs"
luci.config.sauth = luci.config.sauth or {}
sessionpath = luci.config.sauth.sessionpath
sessiontime = tonumber(luci.config.sauth.sessiontime) or 15 * 60
--- Manually clean up expired sessions.
function clean()
local now = os.time()
local files = luci.fs.dir(sessionpath)
if not files then
return nil
end
for i, file in pairs(files) do
local fname = sessionpath .. "/" .. file
local stat = luci.fs.stat(fname)
if stat and stat.type == "reg" and stat.mtime + sessiontime < now then
luci.fs.unlink(fname)
end
end
end
--- Prepare session storage by creating the session directory.
function prepare()
fs.mkdir(sessionpath, 700)
if not sane() then
error("Security Exception: Session path is not sane!")
end
end
--- Read a session and return its content.
-- @param id Session identifier
-- @return Session data
function read(id)
if not id then
return
end
if not id:match("^%w+$") then
error("Session ID is not sane!")
end
clean()
if not sane(sessionpath .. "/" .. id) then
return
end
luci.fs.utime(sessionpath .. "/" .. id)
return luci.fs.readfile(sessionpath .. "/" .. id)
end
--- Check whether Session environment is sane.
-- @return Boolean status
function sane(file)
return luci.sys.process.info("uid")
== luci.fs.stat(file or sessionpath, "uid")
and luci.fs.stat(file or sessionpath, "modestr")
== (file and "rw-------" or "rwx------")
end
--- Write session data to a session file.
-- @param id Session identifier
-- @param data Session data
function write(id, data)
if not sane() then
prepare()
end
if not id:match("^%w+$") then
error("Session ID is not sane!")
end
local f = nixio.open(sessionpath .. "/" .. id, "w", 600)
f:writeall(data)
f:close()
end
--- Kills a session
-- @param id Session identifier
function kill(id)
if not id:match("^%w+$") then
error("Session ID is not sane!")
end
luci.fs.unlink(sessionpath .. "/" .. id)
end
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