Get SSL certificate expiry date quickly and easily with ckcrt script

SSL certificates are daily routine of my work, so there was regular practice to check expiry date of live certificate through Chrome browser -> Developer tools. It is quite time-consuming and annoying work if you have to repeat it. So I made this very simple bash script with which you can check expiry date and some other certificate information quickly, from your terminal. This will work on osx or linux machines. Of corse, you must have OpenSSL installed on your machine in order to use this script.

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Icinga/Nagios plugin for http brute force detection

When dealing with web servers where there are a lot of web sites, especially WordPresses, Joomlas etc., it is very common problem to dealing with flood/brute force attacks. One of most common for example, is generating massive requests on wp-login.php, or xmlrpc.php. With brute force, attackers goal is usually gaining access to administration. This is the simplest kind of method to gain access. Idea is very simple, attacker tries with a lot of different passwords and usernames, until it gets it right. Those operations of course, are automated by bots, scripts.

This can be very damaging for your server as it consumes a lot of memory. Every request means that someone just visited your website. When there is a script with bad intentions visiting your site, that means a lot of requests. Most modern web pages, every request like this, also makes database query. In most cases, server will become unresponsive, system will run out of memory, swap will fill up, mysql will stop responding.. This also means, that all websites on your server will stop working. In many cases, you’ll have to reboot your server to make it responsive again. Of course, there are systems that don’t allow this, like Cloud Linux with its LVE. One of great practices is to lock your administration to some static IP. There different ways.

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Generate NGINX virtual hosts script

I created simple script for creating NGINX virtual hosts so that you don’t have to do it manualy for every new website. Script was created for Linux – CentOS 7 – operating system but it should work on other distributions too. It is written in bash. You will also need wget and tar installed for script to work – wordpress install option.

What it does is pretty straightforward. On input side it will ask you for domain name, SSL option and WordPress installation. You can choose between http and https virtual host definition. By default it will create document root for your domain and NGINX configuration file for that domain. If you choose option for WordPress installation, then it will also download latest wordpress version and unpack files to your newly created document root. You’ll still need to create database manually and finish WordPress installation. This script is suitable for basic NGINX website configurations

Just download script here and template files. Put script createsite to your /usr/sbin/ directory and make it executable. Of corse you can change virtual host templates according to your needs too.

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Remove those ^M symbols with VI

We all know how annoying those ^M-s can be all over your script or file. ^M is a carriage return, and is commonly seen when files are copied from Windows. All of them can be removed in one step, with vi editor. Open your file in vi and hit escape. Then do like shown below.

%s/{Ctrl+V}{Ctrl+M}//{Enter}

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