Programming

5 things you didn’t know about shell scripting

Shell scripting doesn't have to be boring. Let's look at a few common things that many don't know about about shell scripts and why we used it for Lynis. Did you know for example that you can use colors?

Summary of 5 things you didn’t know about shell scripting

Our security auditing tool Lynis is a toolkit consisting of several shell scripts. Many users of the software actually never realized it was written as a bunch of shells scripts. Now that the secret is out, it is time to learn why we used shell scripting. Here are 5 reasons! 1. Shell scripting is powerful Yes, people asked us why our tool Lynis was not written in Perl, Python, Ruby, C++ etc.

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How and why Linux daemons drop privileges

We have a look on how to drop privileges for Linux daemons. By dropping privileges a process can be safeguarded against attacks and a successful compromise of the system.

Summary of How and why Linux daemons drop privileges

In this article we have a look at the privileges of Linux daemons and dropping privileges in particular. The samples provided are in C. Why drop privileges? Some daemons need root permissions to start. This happens for example when a daemon wants to bind to a low port (<1024). However running network based daemons with root permissions is considered to be a serious risk. In case of compromise of the process, an attacker has full access to the system.

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Linux and ASLR: kernel/randomize_va_space

ASLR protects the Linux kernel and programs against different attacks. It can be tuned with the randomize_va_space setting to provide different protections.

Summary of Linux and ASLR: kernel/randomize_va_space

Configuring ASLR with randomize_va_space The Linux kernel has a defense mechanism named address space layout randomization (ASLR). This setting is tunable with the randomize_va_space setting. Before making changes to this setting, it is good to understand what this Linux security measure actually does and how it works. Understanding ASLR In 2001 the term ASLR was first introduced as a patch to the Linux kernel. Its main goal was to randomize memory segments to make abuse by malicious programs harder.

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The 101 of ELF files on Linux: Understanding and Analysis

An step-by-step introduction into ELF files. Learn the structure and format, to understand how binaries and libraries on Linux systems work.

Summary of The 101 of ELF files on Linux: Understanding and Analysis

Some of the true craftsmanship in the world we take for granted. One of these things is the common tools on Linux, like ps and ls. Even though the commands might be perceived as simple, there is more to it when looking under the hood. This is where ELF or the Executable and Linkable Format comes in. A file format that used a lot, yet truly understood by only a few.

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