3 ms·
That's one way to do it, sure. In this case I had the problem of having to use a Mac for a build server, though. I did a few things to get this running: - The
by jparishy 12y ago
That's one way to do it, sure. In this case I had the problem of having to use a Mac for a build server, though.
I did a few things to get this running:
- The application server and build server are separate, with access control to the build server controlled by an API key that I can revoke should anyone gain access to it.
- The process that compiles and runs your code is an unprivileged user.
- All import statements are disabled in user submitted code
- Foundation is imported selectively with only a few classes allowed to be used by submitted code (namely, the NSString, NSArray, NSDictionary, etc APIs)
- Code is checked for a list of blacklisted APIs before hitting the compiler
- The execution of your code has a timeout of a few seconds, and the process will be killed should it take any longer.
I looked into more advanced techniques for sandboxing but couldn't find anything on OS X that was feasible. Happy to be schooled on security though, if you know better than I do :)
- jhammer 12y agoYou can execute the process under sandbox-exec to take advantage of OS X kernel-level sandboxing. You'll need to write your own profile file that allows/denys what you want. There are plenty of examples of these .sb profile files under /System/Library. More: https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/sandbox-exec.1.html https://developer.apple.com/library/mac/documentation/Darwin...
- jparishy 12y agoExcellent! Thank you for pointing me to this!
- lstamour 12y agoGood tip. Another suggestion would be to use chroot :) That said, the best, most foolproof way of doing this really comes down to using OS X to virtualize OS X. Or you could try cross-compiling. It seems to work here: https://github.com/swift-x/tools https://github.com/swift-x/tools (which looks interesting...) It's possible that by the end of this week, maybe next, it will be very easy indeed to compile and/or run Swift on Linux from Linux, at which point you could try LXC or a million other ways to virtualize.
- jparishy 12y agoThanks for the tips! I'd love to move to LXC should an appropriate/feasible compiling solution become available :)
- LinaLauneBaer 12y agoThis mechanism has been deprecated by Apple. In the header file they point out that one should use the OS X sandboxing instead which works with plists instead and can be controlled with less flexibility.
- jhammer 12y agoCalling sandbox_init from inside your app has been deprecated in favor of the App Sandbox mechanism, but I don't see any indication that sandbox-exec is deprecated.
- jparishy 12y agoJust deployed a new script runner backed by sandbox-exec! Thanks again for the tip!