bash Cookbook by Carl Albing & JP Vossen

Author:Carl Albing & JP Vossen
Language: eng
Format: epub, mobi, pdf
Publisher: O'Reilly Media, Inc.
Published: 2017-10-19T16:00:00+00:00

Warning

The restricted shell is not proof against a determined attacker. It can also be difficult to lock down as well as you think you have, since many common applications, such as vi and Emacs, allow shell escapes that might bypass the restricted shell entirely.

Used wisely it can be a valuable additional layer of security, but it should not be the only layer.

Note that the original Bourne shell has a restricted version called rsh, which may be confused with the so-called r-tools (rsh, rcp, rlogin, etc.) remote shell program, which is also rsh. The very insecure rsh has been mostly replaced (we most sincerely hope) by ssh (the Secure Shell).

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