library-mirrors/sandbox.lua
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added comments and informational items to the sandbox table

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kikito 2013-09-13 12:56:06 +02:00
parent 83a5a2b1e2
commit a12502d68e
1 changed files with 46 additions and 6 deletions
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52
sandbox.lua
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@ -1,10 +1,42 @@
local sandbox = {
_VERSION = "sandbox 0.5",
_DESCRIPTION = "A pure-lua solution for running untrusted Lua code.",
_COPYRIGHT = "Copyright (c) 2013 Enrique García Cota",
_LICENSE = [[
MIT LICENSE
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
]]
}
-- The base environment is merged with the given env option (or an empty table, if no env provided)
--
local BASE_ENV = {}
-- Non-safe :
-- List of non-safe packages/functions:
--
-- * string.rep: can be used to allocate millions of bytes in 1 operation
-- * {set|get}metatable: can be used to modify the metatable of global objects (strings, integers)
-- * collectgarbage: can affect performance of other systems
-- * dofile: can access the server filesystem
-- * _G: Unsafe. It can be mocked though
-- * _G: It has access to everything. It could be mocked though.
-- * load{file|string}: All unsafe because they can grant acces to global env
-- * raw{get|set|equal}: Potentially unsafe
-- * module|require|module: Can modify the host settings
@ -13,6 +45,8 @@ local BASE_ENV = {}
-- * math.randomseed: Can affect the host sytem
-- * io.*, os.*: Most stuff there is non-save
-- Safe packages/functions below
([[
_VERSION assert error ipairs next pairs
@ -58,6 +92,7 @@ end
BASE_ENV[module_name] = protect_module(BASE_ENV[module_name], module_name)
end)
-- auxiliary functions/variables
local string_rep = string.rep
@ -73,7 +108,8 @@ local function cleanup()
string.rep = string_rep
end
local function protect(f, options)
-- Public interface: sandbox.protect
function sandbox.protect(f, options)
if type(f) == 'string' then f = assert(loadstring(f)) end
options = options or {}
@ -101,8 +137,12 @@ local function protect(f, options)
end
end
local function run(f, options, ...)
return protect(f, options)(...)
-- Public interface: sandbox.run
function sandbox.run(f, options, ...)
return sandbox.protect(f, options)(...)
end
return setmetatable({protect = protect, run = run}, {__call = function(_,f,o) return protect(f,o) end})
-- make sandbox(f) == sandbox.protect(f)
setmetatable(sandbox, {__call = function(_,f,o) return sandbox.protect(f,o) end})
return sandbox