Kali Linux has been my go-to linux distribution for penetration testing. Normally I do use it as a virtual machine on my laptop. However there are a few situation where you need such a distro on something smaller. Here’s where Raspberry PI comes in handy. Within this blog post series I will document my adventures playing with Kali on such a small computer.

Prerequesites

What do you need to build your own KALI-PI? Basically an Raspberry PI 3, a fast 16GB SD-Card and a laptop/computer of your choice. Some network equipment like router, cables etc. are usefull as well. Before I started I connected all computers to the router and ensured that the internet connection is working.

First Task: Installation

To install KALI you need to download the current image first. Once it has been copied on the SD-Card you can boot your PI from it. To do this follow these steps:

1. Download the image You’ll find it in the Kali Download section. Once you have it unzip it.

2. Finding the SD-Card Before you unmount the SD-Card you need to find out which one it is. This can be done via the mount command:

   mount
   /dev/disk2s1 on /Volumes/boot (. . . . .
   

3. Unmount the SD-Card To umount the SD-Card can be done with the diskutil command.

   diskutil unmountDisk /dev/disk2s1
   

4. Copy it on the SD-Card This can be done multiple ways. I prefer the command line:

dd if=<path to your image file> of=<path to your sd mount point> bs=512k; sync;

And done!

Second Task: Regenerate the server key

Since the server key of KALI’s PI builds is widely known you need to regenerate it with these commands:

rm /etc/ssh/ssh_host_*
dpkg-reconfigure openssh-server
service ssh restart

Now you can add aditional users and disable SSH login for root. And that’s it for today

Cheers !