LinuxQuestions.org - Blog Entries

OpenSSH daemon hardening ( Part 1 ) - Modify the configuration file [ANNOUNCEMENT]

Posted 12-10-2010 at 08:23 AM by angelo.fonzeca (Angelo Fo. personal blog)
Updated 12-13-2010 at 06:29 AM by angelo.fonzeca

Tags hardening, linux, openssh, security, setup

Introduction

OpenSSH is a daemon (a "service" in Unix environments) which helps system administrators to manage server remotely.
The SSH daemon is "similar" to "telnet" in the sense that it provides a remote shell for accessing Unix or GNU/Linux systems.
The main difference is that the latter doesn't use encryptation during the session, so it's easily to intercept the content of the communication between two machines (typically a client/server...

angelo.fonzeca

PerseusGuard Developer

Posted in Linux Security

Views 1826 Comments 0 angelo.fonzeca is offline

OpenSSH daemon hardening ( Part 2 ) - How to use RSA/DSA Keys [ANNOUNCEMENT]

Posted 12-10-2010 at 08:19 AM by angelo.fonzeca (Angelo Fo. personal blog)
Updated 12-13-2010 at 06:30 AM by angelo.fonzeca

Tags dsa, linux, openssh, rsa, security

[Note: This is a draft version of the post; it'll be revised as soon as possible]

Introduction

In my previous post, I explained you how to configure OpenSSH for improving its security. By the way, if your SSH service is available on the Internet and accessible by any IP address (e.g. You connect your client on the internet with a dynamic IP address and/or you want reach your server from anywhere...), it can be more exposed to brute force attacks! So a new "hardening...

angelo.fonzeca

PerseusGuard Developer

Posted in Linux Security

Views 1625 Comments 0 angelo.fonzeca is offline

OpenSSH daemon hardening ( Part 3 ) - Setup a chroot enviroment on CentOS with JailKit[ANNOUNCEMENT]

Posted 12-10-2010 at 08:16 AM by angelo.fonzeca (Angelo Fo. personal blog)
Updated 12-13-2010 at 06:31 AM by angelo.fonzeca

Tags chroot, linux, security, sftp, ssh

[Note: This is a draft version of the post; it'll be revised as soon as possible]

Introduction - What is a chroot?

"A chroot on Unix operating systems is an operation that changes the apparent disk root directory
for the current running process and its children. A program that is
re-rooted to another directory cannot access or name files outside that
directory, and the directory is called a "chroot jail" or...

angelo.fonzeca

PerseusGuard Developer

Posted in Linux Security

Views 2266 Comments 0 angelo.fonzeca is offline

How-to: Harden a Linux Web Server (Overview) [ANNOUNCEMENT]

Posted 12-10-2010 at 08:02 AM by angelo.fonzeca (Angelo Fo. personal blog)
Updated 12-13-2010 at 06:32 AM by angelo.fonzeca

Tags hardening, linux, security, webserver

Introduction

Last weeks on "System administrators" group on Linkedin, the members talked about how to harden a GNU/Linux web server for an hacking contest.
Because I think it was born an intersting "to do" list about the argument during a post of mine, I have taken the decision to report in this article the ideas and my vision of the problem.

The following words are what I wrote...

Hardening Linux step-by-step
...

angelo.fonzeca

PerseusGuard Developer

Posted in Linux Security

Views 2007 Comments 0 angelo.fonzeca is offline

Hardening security and fun around it

Posted 12-06-2010 at 10:21 PM by Web31337 (In The Middle Of Nowhere [edK's blog])
Updated 12-06-2010 at 10:22 PM by Web31337

Tags linuxquestions, security

I've had a long session of improving security on my home server yesterday.
I never actually made a permanent and correct monitoring with rkhunter, but when I ran through all it's options, I finally came to realize this is just awesome, it just OWNZ! Greets to developers team!!!
Some guys from LQ Security forum really are the experts. I always knew that, but just again, in case you read my blog, I'd like to thank you all, the members of "online security team" of LQ, you know...

Web31337

Member

Posted in etc, security

Views 1906 Comments 0 Web31337 is offline

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