Re: lua sandbox environment

On Sat, Jun 7, 2008 at 5:42 PM, Shmuel Zeigerman <shmuz@bezeqint.net> wrote:

Abhinav Lele wrote:

But I want selectively allow different libraries in the lua environment. How can this be achieved ?

lua_pushcfunction(L, luaopen_string);
lua_call(L,0,0);

Do so for every library you want to load.

Is the following approach okay :
to remove library io
executing the statement io=nil

Additionally, to prevent it from being require'd:
package.loaded.io = nil

Also I want strict control over what require keyword can load. So does this imply, that I need to change lua code, and if so where ?

do
local permitted = { lfs = true, lpeg = true, }
local oldrequire = require
require = function(libname)
if not permitted[libname] then
error("library `"..libname.."' not permitted")
end
return oldrequire(libname)
end
end

--
Shmuel