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1. Start with a CERT Tapioca VM with dual ethernet adapters.  I've found that Ubuntu 17.10 Server works well. For some reason, 18.04 Server has some issues related to VMware tools (copy/paste, HGFS) don't seem to be working well (yet?).

2. Disable systemd-resolved.  It gets greedy with what it uses are DNS resolvers, and ends up picking up our wildcard DNS.  This breaks DNS lookups on the wildcard VM itself, which we don't want.

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   sudo systemctl disable systemd-resolved.service sudo service systemd-resolved stop

   Put the following line in the {main] section of your /etc/NetworkManager/NetworkManager.conf:
   

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   dns=default

   Delete the symlink /etc/resolv.conf

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   rm /etc/resolv.conf

   Restart network-manager

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   sudo service network-manager restart

3. Reconfigure your second (LAN side) NIC. When I made the changes above, it made an additional network adapter, leaving the already-configured one as a zombie.  In my case, I clicked the network icon in the top right corner, deleted the old one, and reconfigured the new one.

4. Install tinydns

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   sudo apt install tinydns

5. Configure tinydns

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   sudo adduser --no-create-home --disabled-login --shell /bin/false dnslog sudo adduser --no-create-home --disabled-login --shell /bin/false tinydns sudo tinydns-conf tinydns dnslog /etc/tinydns/ 10.0.0.1 sudo mkdir -p /etc/service ; cd /etc/service ; sudo ln -sf /etc/tinydns/

   Edit /etc/tinydns/root/data to resolve everything to 10.0.0.1:

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   .local:10.0.0.1:a:259200 .0.0.10.in-addr.arpa:10.0.0.1:a:259200 .:10.0.0.1 +*:10.0.0.1:86400 +*.local:10.0.0.1:86400

   build the configuration in /etc/tinydns/root/data:

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   sudo make

6. Restart tinydns:

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   sudo svc -h /etc/service/tinydns

7. Confirm your dns lookups:

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   tapioca@ubuntu:~/tapioca$ nslookup asdf 10.0.0.1 Server: 10.0.0.1 Address: 10.0.0.1#53 Name: asdf.localdomain Address: 10.0.0.1

8. Edit the ~/tapioca/iptables_noproxy.sh file, wiping out the NAT Magic part at the end, replacing it with:

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   # NAT magic iptables -t nat -F PREROUTING iptables -t nat -A PREROUTING -i $internal_net -j DNAT --to-destination 10.0.0.1

   The iptables DNAT line will rewrite the target of traffic arriving on the LAN-side adapter to be handled by 10.0.0.1



9. Edit the ~/tapioca/iptables_mitmproxy.sh file, wiping out the NAT Magic part, replacing it with:

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   # mitmproxy interception iptables -t nat -F PREROUTING iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 8080 iptables -t nat -A PREROUTING -p tcp --dport 443 -j REDIRECT --to-ports 8080 iptables -t nat -A PREROUTING -i $internal_net -j DNAT --to-destination 10.0.0.1

10. Create a ~/tapioca/wildcard.sh script to start mitmproxy HTTP(S) interception automatically on boot:

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    #!/bin/bash echo Setting network redirection rules... cd /home/tapioca/tapioca /home/tapioca/tapioca/proxy.sh

    Ensure that the ~/tapioca/wildcard.sh is executable

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    chmod +x ~/tapioca/wildcard.sh

11. Configure the script to start automatically on X starting.

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    mkdir -p ~/.config/autostart nano -w ~/.config/autostart/.desktop

    Edit the .desktop file to look like this:

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    [Desktop Entry] Encoding=UTF-8 Name=Wildcard Comment=Wildcard network redirection Exec=/home/tapioca/tapioca/wildcard.sh Terminal=false

12. Click the Red 'X' in the wildcard VM to run the new wildcard rules (or just reboot).
    
    

13. Connect a testing VM to the same vmnet network as the LAN adapter of your new wildcard VM, and try some network  stuff.
    
    
    
    

14. Confirm the traffic on the server side:
    
    
    

15. (optional) configure wildcard VM to automatically log in the tapioca user

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    sudo apt install mingetty systemctl edit getty@tty1

    Configure it to look like this:

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    [Service] ExecStart= ExecStart=-/sbin/mingetty --autologin tapioca --noclear %I

16. Install apache and php, as you'll likely at least want a web server to simulate

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    sudo apt-get install apache2 sudo apt-get install php libapache2-mod-php sudo a2enmod ssl sudo a2ensite default-ssl sudo systemctl reload apache2

17. Create a shortcut for the apache2 log tail
    
    1. Right click in the XFCE panel
    2. Click Panel → Add new items
    3. Click Launcher and then Add
    4. Right-click the new panel icon and click Properties
    5. Click Add a new empty item
    6. Call it what you want in the Name field.  e.g. "Apache log tailer"
    7. In the Command field, enter: sudo tail -F /var/log/apache2/access.log
    8. For the icon, select logviewer
    9. Check the Run in terminal checkbox

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