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Can I execute untrusted Common Lisp code in a restricted environment?


Can I execute untrusted Common Lisp code in a restricted environment?

By : user2951616
Date : November 18 2020, 11:13 AM
With these it helps To read the code, start by disabling *read-eval* (that stops people injecting execution during parsing, using something like #.(do-evil-stuff). You probably want to do the reading using a custom read-table that disables most (if not all) read-macros. You probably want to do the reading with a custom, one-off, package, importing only symbols you allow.
Once you've read the user-provided code, you still need to validate that there's no unexpected function/macro references in the code. If you have used a custom package, you should be able to confirm that each symbol falls in either of the two classes "belongs to the custom one-off package" (this is user-supplied stuff) or "explicitly allowed from elsewhere" (you would need this list to construct the custom package).
code :


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How to execute an untrusted Lua file in its own environment from the C API

How to execute an untrusted Lua file in its own environment from the C API


By : user2203983
Date : March 29 2020, 07:55 AM
will be helpful for those in need See the discussion at the Lua User's Wiki of sandboxing, and the more general topic of script security. There are a number of subtle and not so subtle issues with this kind of thing. It can be done, but protecting against code such as for i=1,1e39 do end requires more than just restricting what functions are available to a sandbox.
The general technique is to create a function environment for the sandbox that has a whitelist of permitted functions in it. In some cases, that list might even be empty, but letting the user have access to pairs(), for example, is almost certainly harmless. The sandbox page has a list of the system functions broken down by their safety as a handy reference for constructing such a whitelist.
What is the purpose of &environment in Common Lisp?

What is the purpose of &environment in Common Lisp?


By : Lambert Albert
Date : March 29 2020, 07:55 AM
To fix this issue Doc
Macro Lambda Lists:
code :
(defmacro psetf (&whole whole-form
                 &rest args &environment env)
  (labels ((recurse (args)
             (multiple-value-bind (temps subforms stores setterform getterform)
                 (get-setf-expansion (car args) env)
               (declare (ignore getterform))
               (when (atom (cdr args))
                 (error-of-type 'source-program-error
                   :form whole-form
                   :detail whole-form
                   (TEXT "~S called with an odd number of arguments: ~S")
                   'psetf whole-form))
               (wrap-let* (mapcar #'list temps subforms)
                 `(MULTIPLE-VALUE-BIND ,stores ,(second args)
                    ,@(when (cddr args) (list (recurse (cddr args))))
                    ,@(devalue-form setterform))))))
    (when args `(,@(recurse args) NIL))))
(defmacro defconstant (name value &optional documentation
                       &environment env)
  (destructuring-bind (name &key (test ''eql))
      (alexandria:ensure-list name)
    (macroexpand-1
     `(alexandria:define-constant ,name ,value
        :test ,test
        ,@(when documentation `(:documentation ,documentation)))
     env)))
How do you securely parse untrusted input in Common Lisp?

How do you securely parse untrusted input in Common Lisp?


By : linmanqiang
Date : March 29 2020, 07:55 AM
like below fixes the issue Generally, just that the standard code reader is so readily available and can read many kinds of input does not mean that you should use it to read anything but code.
There are many libraries for parsing a lot of things, e. g. parse-number for the Lisp number formats, fare-csv for CSV files (among many other CSV libraries), json-streams for JSON (again, many others). For most formats, you can just do a system-apropos lookup with Quicklisp.
Setting up a working Common Lisp environment for the aspiring Lisp newbie

Setting up a working Common Lisp environment for the aspiring Lisp newbie


By : user3784706
Date : March 29 2020, 07:55 AM
Hope this helps Let's assume you have emacs running and have checked out SLIME from CVS and installed it. This should be easy with any Linux distro; apt-get install emacs slime does it for me. (You should also install SBCL, the best Common Lisp implementation.)
SLIME out of the box doesn't do much anymore, so it needs configuration. Configuring emacs is done in your ~/.emacs file. Visit that file (C-x C-f ~/.emacs). I have something like this, which loads a variety of goodies:
What Common Lisp environment to use on Mac?

What Common Lisp environment to use on Mac?


By : jaden dunn
Date : March 29 2020, 07:55 AM
Any of those help Here is how to set up an environment with Emacs, SBCL and SLIME from scratch using the latest binaries available at this time.
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