Rewrote state based redirection

[project/luci.git] / libs / web / luasrc / sauth.lua

diff --git a/libs/web/luasrc/sauth.lua b/libs/web/luasrc/sauth.lua
index d838f84..894732d 100644 (file)
--- a/libs/web/luasrc/sauth.lua
+++ b/libs/web/luasrc/sauth.lua
@@ -12,16 +12,20 @@ You may obtain a copy of the License at
 $Id$
 
 ]]--
+
+--- LuCI session library.
 module("luci.sauth", package.seeall)
 require("luci.fs")
+require("luci.util")
+require("luci.sys")
 require("luci.config")
 
 
 luci.config.sauth = luci.config.sauth or {}
 sessionpath = luci.config.sauth.sessionpath
-sessiontime = tonumber(luci.config.sauth.sessiontime)
-
+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)
@@ -39,21 +43,46 @@ function clean()
        end
 end
 
+--- Prepare session storage by creating the session directory.
 function prepare()
        luci.fs.mkdir(sessionpath)
        luci.fs.chmod(sessionpath, "a-rwx,u+rwx")
+        
+       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
        clean()
+       if not sane(sessionpath .. "/" .. id) then
+               return
+       end
        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, "mode")
+                       == (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 luci.fs.stat(sessionpath) then
+       if not sane() then
                prepare()
        end
        luci.fs.writefile(sessionpath .. "/" .. id, data)