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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.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
--- 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
function encode(t)
return luci.util.get_bytecode({
user=t.user,
token=t.token,
secret=t.secret,
atime=luci.sys.uptime()
})
end
function decode(blob)
local t = loadstring(blob)()
return {
user = t.user,
token = t.token,
secret = t.secret,
atime = t.atime
}
end
--- Read a session and return its content.
-- @param id Session identifier
-- @return Session data
local function _read(id)
local blob = fs.readfile(sessionpath .. "/" .. id)
return blob
end
--- Write session data to a session file.
-- @param id Session identifier
-- @param data Session data
local function _write(id, data)
local f = nixio.open(sessionpath .. "/" .. id, "w", 600)
f:writeall(data)
f:close()
end
function write(id, data)
if not sane() then
prepare()
end
if not id or #id == 0 or not id:match("^%w+$") then
error("Session ID is not sane!")
end
_write(id, data)
end
function read(id)
if not id or #id == 0 then
return
end
if not id:match("^%w+$") then
error("Session ID is not sane!")
end
if not sane(sessionpath .. "/" .. id) then
return
end
local blob = _read(id)
if decode(blob).atime + sessiontime < luci.sys.uptime()then
fs.unlink(sessionpath .. "/" .. id)
return
end
-- refresh atime in session
refreshed = encode(decode(blob))
write(id, refreshed)
return blob
end
--- Check whether Session environment is sane.
-- @return Boolean status
function sane(file)
return luci.sys.process.info("uid")
== fs.stat(file or sessionpath, "uid")
and fs.stat(file or sessionpath, "modestr")
== (file and "rw-------" or "rwx------")
end
--- Kills a session
-- @param id Session identifier
function kill(id)
if not id:match("^%w+$") then
error("Session ID is not sane!")
end
fs.unlink(sessionpath .. "/" .. id)
end
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