Configure Squid proxy for SSL/TLS inspection (HTTPS interception)

Squid proxy

Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more.

Squid can be configured to make SSL/TLS inspection (aka HTTPS interception) so the proxy can decrypt proxied traffic (Squid calls this feature ssl bump).

Afaik the Squid package included in the Linux distros is not compiled with SSL/TLS inspection support but the good news is that diladele (its github repo and Websafety documentation are useful resources) provides packages for Ubuntu and Centos, recompiled (you can do by yourself) with support for HTTPS filtering and SSL/TLS inspection. This means that we have just to configure Squid. Not an easy task anyway ūüôā

I provide to you a working config, follow next steps.

Continue reading “Configure Squid proxy for SSL/TLS inspection (HTTPS interception)”

Ubuntu Terminator bug doubles keystrokes when broadcast option is set

Since Ubuntu 18.10 I’m experiencing a weird bug on Terminator, the terminal I use because of its broadcasting functionality.

The bug is known and tracked on launchpad but not fixed ¬Į\_(„ÉĄ)_/¬Į so I found a quick way to fix it, enjoy!

sudo mv /usr/bin/terminator /usr/bin/terminator.SAVE
cat <<TERMINATOR > /tmp/terminator
#!/bin/bash
sh -c "DBUS_SESSION_BUS_ADDRESS='' /usr/share/terminator/terminator"
TERMINATOR
chmod 755 /tmp/terminator
sudo mv /tmp/terminator /usr/bin

Follow and be notified of any twitter thread reply – a python twitter scraper

I use twitter to follow a lot of good feeds but often I need to follow twitter threads for new replies to have a fast and complete view of complex threads even if I’m not cited or the tweet owner.

I did some search and found a python script from @edu on github that was a good starting point. I learned that twitter API doesn’t allow to get all the replies to a tweet but can be used to search for replies to a given tweet and replies to any reply as well. Good.

So starting from @edu code I wrote Twitter Scraper, a project – made of 2 scripts

  • twitter-scraper.py to get a complete list of twitter threads replies so you can have a fast and complete view of complex threads even if you are not the owner or you are not cited in all the tweet branches [video]
  • tweet.monitor.sh to check and be notified about new twitter threads replies [video]

The project page details the usage and configuration of both scripts with examples (command line and video), so jump and test ūüôā

Enjoy!

Raspberry Pi + Pi-hole: a perfect combo

Raspberry Pi 3 B+ from The Pi Hut
Raspberry Pi 3 B+ from The Pi Hut

In our SOC we use Pi-hole to block network ad-serving domains. Benefits of Pi-hole are highlited on their web site

  • Since ads are blocked before they are downloaded, your network will perform better
  • Network-level blocking allows you to block ads in non-traditional places such as mobile apps and smart TVs, regardless of hardware or OS

Pi-hole works on Linux systems and for home usage is common to install it on a Raspberry Pi device.

This is my jurney into installing Pi-hole on my Raspberry Pi. Continue reading “Raspberry Pi + Pi-hole: a perfect combo”

Install and configure autoclick software on Linux

This is a memo-post for me, hope useful to someone else too.
The need is to have autoclick on your desktop to automate some recurring task.

To do this I installed xdotool

sudo apt-get install xdotool

Ater the installation place your mouse on the desktop and get mouse location:

  • x and y: screen coordinates;
  • screen: screnn number, useful if you have more than one monitor/screen;
  • window: application window ID.

gmellini@SandTigerShark:~$ xdotool getmouselocation
x:758 y:512 screen:0 window:54525959

Test it executing the standalone command.

gmellini@SandTigerShark:~$ xdotool mousemove 1242 998 click 1

And iterate (following commad sleeps 5 seconds between the commands).

gmellini@SandTigerShark:~$ while [ true ]; do xdotool mousemove 1242 998 click 1; sleep 5; done

Enjoy!

Configure Linux High Availability Cluster in Ubuntu with Corosync and DRBD file sync

Synchronization by Taxydromos69
Synchronization by Taxydromos69

I already wrote how to configure a basic High Availability Ubuntu cluster. The steps to setup a basic cluster are detailed in the previous post, so please read the post if you don’t know how to make the cluster up&running.¬†Same conventions are used here.

One of the topic I didn’t covered on the old post was “application replication/synchronization between the nodes“. Now it’s time to show you how to keep in sync files between cluster nodes, using DRBD software. DRBD is a powerful component of Linux kernel and is designed to keep in sync¬†data via TCP/IP between nodes volumes. In this post we will setup a clustered freeradius service that sync /etc/freeradius/clients.conf file between nodes. Continue reading “Configure Linux High Availability Cluster in Ubuntu with Corosync and DRBD file sync”

Block Flash content on Squid proxy

No more flash
No more flash

One of the trending topic I discuss regularly with my company IT department is the need to block Flash content on our navigation proxies.

As a Security people I have no doubt about, Flash must be blocked. Period.

Because I manage some¬†Squid proxy I made this simple and effective configuration in squid.conf¬† file. Continue reading “Block Flash content on Squid proxy”