Hak5 Cloud C2 on a Raspberry Pi

Setting up the Raspberry Pi (RPi) itself isn't covered here, a default installation of Raspberry Pi OS Lite will do the job. This setup will work on a LAN only, i.e. no external access to the C2 instance from the internet. To get that working, port openings and stuff is needed but that isn't covered here.

If needed, run the following to get information about which C2 version to run on the RPi:
cat /proc/cpuinfo

Note!
You need a license key from Hak5 in order to activate/validate the installation (the community edition is free, but still needs a license key). The RPi also needs to have a working connection to the internet since the C2 license is validated at service start, and during runtime as well.

Download the C2 zip file to the RPi and unzip it
wget https://c2.hak5.org/download/community -O c2.zip
unzip c2.zip

Start the server manually to verify that it works:
./c2-3.1.2_armv7_linux -hostname <ip address>
(or whatever version that was downloaded)

When the C2 instance has been verified as working properly (possible to login, possible to add devices, etc. via the web GUI) it is good to set it up as a service.

It's also good to let the RPi have a static IP address on the local network, or at least a static DHCP lease.

Move the Cloud C2 binary to a more suitable location in the file system
sudo mv c2-3.1.2_armv7_linux /usr/local/bin

Create a directory for the database file
sudo mkdir /var/cloudc2

Move the database file
sudo mv c2.db /var/cloudc2/

Create a systemd service file for Cloud C2
sudo nano /etc/systemd/system/cloudc2.service

Add the lines below (replace parameters as necessary for this specific C2 instance if needed)

[Unit]
Description=Hak5 Cloud C2
After=cloudc2.service
[Service]
Type=idle
ExecStart=/usr/local/bin/c2-3.1.2_armv7_linux -hostname <ip address> -db /var/cloudc2/c2.db
[Install]
WantedBy=multi-user.target

Save and exit the file

Run the following commands to reload, enable on boot, start and inspect the newly created Cloud C2 service:
sudo systemctl daemon-reload
sudo systemctl enable cloudc2.service
sudo systemctl start cloudc2.service
sudo systemctl status cloudc2.service

Reboot the RPi and verify that Cloud C2 is available as a service (i.e. browse to the C2 instance from a device on the local network, use port 8080).

It's of course also possible to ssh into the RPi and run ps ax and look for the C2 process (if ssh has been enabled on the RPi that is).

If the C2 service does not start (can be checked with the same command as above: sudo systemctl status cloudc2.service) then it might be due to the fact that the service tries to start before the RPi has gotten a connection to the internet, hence not possible for it to validate the C2 license and therefore the service will not start. In that case, it's possible to add a sleep in the service to let it sleep for a specified amount of time before the C2 instance starts. In the [Service] section, add the following line before "ExecStart", adjust the time as needed
ExecStartPre=/usr/bin/sleep 30

Save and reboot again... Verify...