Linux

PAM - What and Why Authenticating a user to a service used to be a time-consuming process. The application had to be aware of all possible authentication mechanisms and had to be rebuilt every time a new authentication method was introduced… As a result, there was a significant amount of code repetition. Naturally, it was disliked by everyone!! As a result, the concept of a middle-ware application responsible for user authentication to a service arose....

Audits are critical for system administrators to detect security violations and track security-relevant information on their systems. Anyone concerned about the security, stability, and proper operation of their Linux servers should conduct an audit. How to do auditing in linux One simple way is to use the history command to observe the shell’s history, but this has many limitations. One of them is that this command is only applicable to the current user....

Malware has been used numerous times by attackers to destroy a computer’s Master Boot Record, rendering it inoperable. By erasing the MBR, the machine is unable to load the operating system. There is no easy way to rewrite the Master Boot Record into place without an operating system, and the machine becomes completely useless and unrecoverable. In addition, many ransomwares infect the master boot record by overwriting it with malicious code....

Steps to generate a binary When we write a program using a language like C, it is not C source code which really gets executed. This C code passes through many steps and finally a binary file is generated out of it. This binary file is what gets executed on any computer. There are many steps through which a C code is converted into a binary file:- Pre-processing Compilation Assemble Linking Let’s follow these steps one by one to understand what they do to the C code and how a binary is generated via this....

This is Task 06 of the Eudyptula Challenge ------------------------------------------ Nice job with the module loading macros, those are tricky, but a very valuable skill to know about, especially when running across them in real kernel code. Speaking of real kernel code, let's write some! The task this time is this: - Take the kernel module you wrote for task 01, and modify it to be a misc char device driver. The misc interface is a very simple way to be able to create a character device, without having to worry about all of the sysfs and character device registration mess....