Plash -- Plash (the Principle of Least Authority Shell)

 

About Plash
English (USA)

Plash (the Principle of Least Authority Shell) is a Unix shell that lets you run Unix programs with access only to the files and directories they need to run.

In order to implement this, the filesystem is virtualized. Each process can have its own file namespace, which can contain a subset of your files.

This is implemented by modifying GNU libc and replacing the system calls that use filenames. For example, open() is changed so that it sends a message to a file server via a socket. If the request is successful, the server sends the client a file descriptor. Processes are run as the user 'nobody' in a chroot jail.

No kernel modifications are required. Plash can run Linux binaries unmodified, provided they are dynamically linked with libc, which is almost always the case.

To see the collection of prior postings to the list, visit the Plash Archives.

Using Plash
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