Multiply floats by 10,100, … in bash

A short one today. Bash can only handle integer numbers and not floats, so when someone searches the internet on how to use math on floats in bash the solution they find is usually “use bc” and looks something like this:

Or if they want the result to be an integer:

It’s a […]

API for Troy Hunts passwords list

TL;DR version: https://github.com/ryanschulze/password-check-api

I threw together a small API that can make the data from Troy Hunts 320 Million passwords easily query-able (or any list of SHA1 hashes for that matter). It’s nothing special, a MySQL backend, a Webserver and an API application using the Slim framework. It’s also stupid fast because there is nothing fancy or special about it. Since it uses a well documented framework it is also easy to change/extend/adjust to your specific requirements. […]

Keeping track of Jira issues

A Jira search that I find useful (show tickets you created and haven’t been updated in a while) since I often have to track tickets I created across different projects. You can subscribe to searches and get an email sent with the results. reporter = currentUser() AND updated < -90d AND resolution = Unresolved ORDER BY updatedDate DESC 

Setting up multidomain DKIM with Exim

I was recently setting up SPF, DKIM and DMARC for multiple domains and was having trouble getting Exim to sign emails for the different domains. I found an article here explaining the steps. But I kept getting the following error in my exim logs: failed to expand dkim_private_key: missing or misplaced { or } The suggested configuration was the following:

I’m not quite […]

Ansible tasks to reboot a server if required

A quick one today.  The following ansible tasks check if a server needs to be rebooted, reboots it, and then waits for it to come back online. Easy to fire off during a maintenance after updating packages.

 

A script to diff files/directories on two different servers

Ok,  short one today. This is a straightforward script that simplifies comparing directories on different servers. There is no magic in it, it just rsyncs the directories to a local temp directory and runs diff against them (then deletes the directory afterwards). Mainly intended for config files, I wouldn’t recommend trying to diff gigabytes of binaries with […]

Convert configuration files to ansible templates

I’ve been playing around with ansible a lot lately, and I noticed that while changing stuff from “installed and configured manually” to “installed and configured by ansible” I was running into quite a few configuration files that needed to be manually turned into templates. It can be quite tedious to replace values in a configuration file with […]

What was and wasn’t fixed in bash after the Shellshock vulnerability (CVE-2014-6271)

By now there are a few websites/blog posts online that explain CVE-2014-6271 (code being executed that was inserted after the function definition) and  CVE-2014-7169 (parser error that also led to code being executed). Both CVEs have been patched. Check out “Quick notes about the bash bug, its impact, and the fixes so far“, “Shellshock proof […]