Create an anonymous document drop with any Android

Honestly I have no idea why I didn’t think about this before. I’m sorry it’s taken so long. This guide will show you how to use any Android to host a Tor hidden service and send it files from anywhere in the world with SSH or SCP. I tested this with a Nexus 6 (shamu) running Android 6 but I will test this on Android 4.4.4 soon. Root is not needed, you could perform these steps on any Android. Play around with this. I do not currently have a lot of confidence (stability) in an Android (Wifi), SSHelper (app), Orbot (app), and Tor (circuit) hidden-service combination. But I’ll try this out on an extra Android and see if I can still access it after a week or so and update the post.

Much wow.

There are several amazing things about this setup:

1. Easy. It’s so easy, omg. Even securing the Android is super easy with this narrow of use case.

2. Cheap. Like, as little as $10 cheap, or, “can I have your old Android for free, please” cheap.

3. You could drop a burner Android, using any Wifi you can connect to, in so many places. And if you don’t have a wall outlet where it could sit and charge forever, you could have several days or weeks worth of uptime before it dies.

Guide

0. Buy a cheap Android in person with cash, you may prefer one with an SD card slot for additional storage. Go to a coffee shop you’ve never been that has free Wifi. Turn on your Android and connect to the public Wifi. Create a new Google account with an unattributable username and password. Put the phone into airplane mode then reactivate the Wifi. Disable any apps and services not needed (dependent on the device) then install any Android OS or app updates that are necessary. Ensure the Android’s storage is encrypted, and ensure that devices access requires a long passphrase for boot and for device entry.

Note on “buy any Android” — some burners that I’ve purchased before, like a $30 one from Verizon, forces you to activate the device as soon as you turn it on, making it extremely difficult to control any aspect of Android until phoning home to Verizon and activating with a phone number. If you want to be sure you don’t have to deal with carrier crap, spend a little more and go with an unlocked Moto E for $120. The 1st Gen and 2nd Gen Moto E’s conveniently support a 32GB microSD.

1. Download “Orbot: Proxy with Tor” (by: The Tor Project) from the Play Store. Open “Orbot”. Go into settings and scroll down to “Hidden Service Hosting” and enable “Hidden Service Hosting”. Tap “Hidden Service Ports” and enter “2222”. Back out of settings and long-press the power button to connect to the Tor network. Go back into settings then scroll down and tap “.Onion Hostname” to view your hidden service address. Document that address on your laptop with Tails or Torified SSH ready to go.

2. Download “SSHelper” (by: Paul Lutus) from the Play Store. Open the “SSHelper” app. That’s it. The default user is “admin”, default password is “admin”. The default ssh, scp, and rsync directory is your normal user’s home directory, which is one below the virtualized (or real) “SDCard”. I was able to connect with an ECDSA key pair.

3. Download “NetGuard – no-root firewall” (by: Marcel Bokhorst) from the Play Store. Open “NetGuard”. In the top right corner are three vertically aligned dots. Tap that button to enter into the Settings menu. Activate “Block Wi-Fi by default”, “Block mobile by default”, and “Manage system applications”. Click back to save the settings changes. Now scroll down and find “Orbot” and tap the orange Wifi icon (it will turn from a striked-out orange icon to a green icon) which will allow it to access the network over Wifi only. Scroll down a little bit more to “SSHelper” and tap the orange Wifi icon to give it Wifi access too. Now at the very top, to the right of “NetGuard”, tap the switch icon to activate your firewall rules. Accept (OK) the two prompts that follow.

Your Android is now ready to go.

4. From your Linux or OS X command line interlace (CLI), you should now be able to send it any files. It only took 22 seconds for me to transfer an 8 MB PDF:

scp -P 2222 bulletproof-ssl-and-tls.pdf admin@c3dznupj493fgtd5j.onion:.

Torify SSH (Ubuntu) for connecting to hidden service addresses

Install tor and openssh-client. Then:

sudo vim /etc/ssh/ssh_config

Add (under “Host *”)

proxyCommand ncat --proxy 127.0.0.1:9050 --proxy-type socks5 %h %p

Then:

sudo service ssh restart