110 lines
2.4 KiB
Lua
110 lines
2.4 KiB
Lua
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--[[
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Session authentication
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(c) 2008 Steven Barth <steven@midlink.org>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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$Id: sauth.lua 5190 2009-07-31 23:36:15Z jow $
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]]--
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--- LuCI session library.
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module("luci.sauth", package.seeall)
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require("luci.util")
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require("luci.sys")
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require("luci.config")
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local nixio = require "nixio", require "nixio.util"
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local fs = require "nixio.fs"
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luci.config.sauth = luci.config.sauth or {}
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sessionpath = luci.config.sauth.sessionpath
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sessiontime = tonumber(luci.config.sauth.sessiontime) or 15 * 60
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--- Manually clean up expired sessions.
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function clean()
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local now = os.time()
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local files = fs.dir(sessionpath)
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if not files then
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return nil
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end
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for file in files do
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local fname = sessionpath .. "/" .. file
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local stat = fs.stat(fname)
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if stat and stat.type == "reg" and stat.mtime + sessiontime < now then
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fs.unlink(fname)
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end
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end
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end
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--- Prepare session storage by creating the session directory.
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function prepare()
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fs.mkdir(sessionpath, 700)
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if not sane() then
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error("Security Exception: Session path is not sane!")
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end
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end
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--- Read a session and return its content.
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-- @param id Session identifier
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-- @return Session data
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function read(id)
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if not id or #id == 0 then
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return
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end
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if not id:match("^%w+$") then
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error("Session ID is not sane!")
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end
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clean()
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if not sane(sessionpath .. "/" .. id) then
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return
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end
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fs.utimes(sessionpath .. "/" .. id)
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return fs.readfile(sessionpath .. "/" .. id)
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end
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--- Check whether Session environment is sane.
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-- @return Boolean status
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function sane(file)
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return luci.sys.process.info("uid")
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== fs.stat(file or sessionpath, "uid")
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and fs.stat(file or sessionpath, "modestr")
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== (file and "rw-------" or "rwx------")
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end
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--- Write session data to a session file.
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-- @param id Session identifier
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-- @param data Session data
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function write(id, data)
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if not sane() then
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prepare()
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end
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if not id:match("^%w+$") then
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error("Session ID is not sane!")
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end
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local f = nixio.open(sessionpath .. "/" .. id, "w", 600)
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f:writeall(data)
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f:close()
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end
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--- Kills a session
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-- @param id Session identifier
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function kill(id)
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if not id:match("^%w+$") then
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error("Session ID is not sane!")
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end
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fs.unlink(sessionpath .. "/" .. id)
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end
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