library-mirrors/sandbox.lua
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made _G available as a mocked up env inside the sandboxed env

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kikito 2013-09-13 13:26:08 +02:00
parent 721878115a
commit 549e31e7cd
2 changed files with 6 additions and 4 deletions
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3
sandbox.lua
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@ -36,7 +36,7 @@ local BASE_ENV = {}
-- * {set|get}metatable: can be used to modify the metatable of global objects (strings, integers) -- * {set|get}metatable: can be used to modify the metatable of global objects (strings, integers)
-- * collectgarbage: can affect performance of other systems -- * collectgarbage: can affect performance of other systems
-- * dofile: can access the server filesystem -- * dofile: can access the server filesystem
-- * _G: It has access to everything. It could be mocked though. -- * _G: It has access to everything. It can be mocked to other things though.
-- * load{file|string}: All unsafe because they can grant acces to global env -- * load{file|string}: All unsafe because they can grant acces to global env
-- * raw{get|set|equal}: Potentially unsafe -- * raw{get|set|equal}: Potentially unsafe
-- * module|require|module: Can modify the host settings -- * module|require|module: Can modify the host settings
@ -116,6 +116,7 @@ function sandbox.protect(f, options)
local quota = options.quota or 500000 local quota = options.quota or 500000
local env = merge(options.env or {}, BASE_ENV) local env = merge(options.env or {}, BASE_ENV)
env._G = env._G or env
setfenv(f, env) setfenv(f, env)

7
spec/sandbox_spec.lua
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@ -23,7 +23,6 @@ describe('sandbox.run', function()
it('does not allow access to not-safe stuff', function() it('does not allow access to not-safe stuff', function()
assert_error(function() sandbox.run('return setmetatable({}, {})') end) assert_error(function() sandbox.run('return setmetatable({}, {})') end)
assert_error(function() sandbox.run('return string.rep("hello", 5)') end) assert_error(function() sandbox.run('return string.rep("hello", 5)') end)
assert_error(function() sandbox.run('return _G.string.upper("hello")') end)
end) end)
end) end)
@ -88,8 +87,10 @@ describe('sandbox.run', function()
describe('when given an env option', function() describe('when given an env option', function()
it('is available on the sandboxed env', function() it('is available on the sandboxed env as the _G variable', function()
assert_equal(1, sandbox.run("return foo", {env = {foo = 1}})) local env = {foo = 1}
assert_equal(1, sandbox.run("return foo", {env = env}))
assert_equal(env, sandbox.run("return _G", {env = env}))
end) end)
it('does not hide base env', function() it('does not hide base env', function()