--- 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 == "regular" and stat.atime + sessiontime < now then
- luci.fs.unlink(fname)
- end
- end
-end
-
--- Prepare session storage by creating the session directory.
function prepare()
- luci.fs.mkdir(sessionpath)
- luci.fs.chmod(sessionpath, "a-rwx,u+rwx")
-
+ 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+$") then
+ error("Session ID is not sane!")
+ end
+
+ _write(id, data)
+end
+
function read(id)
- clean()
- if not id or not sane(sessionpath .. "/" .. id) then
+ if not id or #id == 0 then
+ return
+ end
+ if not id:match("^%w+$") 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
- return luci.fs.readfile(sessionpath .. "/" .. id)
+ -- refresh atime in session
+ refreshed = encode(decode(blob))
+ write(id, refreshed)
+ return blob
end
-- @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, "mode")
+ == fs.stat(file or sessionpath, "uid")
+ and fs.stat(file or sessionpath, "modestr")
== (file and "rw-------" or "rwx------")
end
-
---- Write session data to a session file.
+--- Kills a session
-- @param id Session identifier
--- @param data Session data
-function write(id, data)
- if not sane() then
- prepare()
+function kill(id)
+ if not id:match("^%w+$") then
+ error("Session ID is not sane!")
end
- luci.fs.writefile(sessionpath .. "/" .. id, data)
- luci.fs.chmod(sessionpath .. "/" .. id, "a-rwx,u+rw")
-end
\ No newline at end of file
+ fs.unlink(sessionpath .. "/" .. id)
+end