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Bash Cookbook

You're reading from   Bash Cookbook Leverage Bash scripting to automate daily tasks and improve productivity

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Product type Paperback
Published in Jul 2018
Publisher Packt
ISBN-13 9781788629362
Length 264 pages
Edition 1st Edition
Languages
Tools
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Authors (2):
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 Brash Brash
Author Profile Icon Brash
Brash
Ganesh Sanjiv Naik Ganesh Sanjiv Naik
Author Profile Icon Ganesh Sanjiv Naik
Ganesh Sanjiv Naik
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Toc

Table of Contents (15) Chapters Close

Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
1. Crash Course in Bash FREE CHAPTER 2. Acting Like a Typewriter and File Explorer 3. Understanding and Gaining File System Mastery 4. Making a Script Behave Like a Daemon 5. Scripts for System Administration Tasks 6. Scripts for Power Users 7. Writing Bash to Win and Profit 8. Advanced Scripting Techniques 1. Other Books You May Enjoy Index

Using chroot and restricted Bash shells to secure scripts


In this recipe, we will learn about chroot and restricted bash(rbash). The chroot command is used to change the root directory. Using rbash, we can restrict some features of the bash shell for some security purposes.

Getting ready

Besides having a Terminal open, you need to ensure that rbash is installed in the system.

How to do it…

  1. Now, we will look at the command to start rbash. Run the following command:
$ bash -r
or
$ rbash
  1. Now we will test some restrictions. First, we will try to change the directory. Run the following command:
$ cd work/

Next, we will try to write some contents to the file. Run the given command to write some contents into the file:

ls > log.txt

How it works…

After using rbash, access to the system will be limited. In the preceding examples, we started the restricted shell by typing bash -r or rbash.

Next, we tried to change the directory, but we got the rbash: cd: restricted message, so we cannot change the directory...

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