Introduction: Using Android Ssh Shortcuts to Securely Control Your Linux Projects!

Picture of Using Android  Ssh Shortcuts to Securely Control Your Linux Projects!

If you make internet connected stuff based on Linux/GNU and own a
Android device powered by CyanogenMod rejoice! This is a safe(as safe as it gets) way to control your projects, so unlock your home to your friends while miles away, start a car(or don’t), securely wipe all of your disks with one touch, feed the cats, or just turn your lights on and off.

All you need is:

1x rooted Android device

1x sl4a scripting layer for android

1x project that supports ssh with a dyn-dns setup on ssh port if you want direct access from the internet,and not only from wifi.

Step 1: Generate Public and Private Keys


Open terminal emulator:

su

cd /data/.ssh/

ssh-keygen -t rsa -C “Name”

You should see:

Generating public/private rsa key pair.

Enter file in which to save the key:

Press ‘Enter’ here to accept the default.

Enter passphrase (enter strong passphrase):

Enter same passphrase again:

The key fingerprint is:

5e:f5:7e:71:ec:2d:2c:46:02:9d:3e:89:4a:3a:b7:b6 Name

Copy public keys to device you wish to control:

If you use most linux distro’s you’ll have to do it this way:

scp /data/.ssh/name_id_rsa.pub root@OtherDevicesIP:.ssh/

ssh root@OtherDevicesIP ‘cat .ssh/name_id_rsa.pub >> .ssh/authorized_keys

For OpenWrt do this:

scp /data/.ssh/name_id_rsa.pub root@OtherDevicesIP:/etc/dropbear/

ssh root@OtherDevicesIP ‘cat /etc/dropbear/id_rsa_name.pub >> /etc/dropbear/authorized_keys

Step 2: Make a Script

Picture of Make a Script

Tap on menu button and than add shell:

Name the script and add command:

su -c “ssh -i /data/.ssh/name_id_rsa root@OtherDeviceAddress ‘command'”

Press menu button, then save&run!

Input yes when prompted to save host in known_hosts, and close terminal when prompted.

If you are conecting over dynamic dns than you must delete the IP address from /data/.ssh/known_hosts to end further suffering when the IP changes!

Step 3: Add a Shortcut to Homescreen

Picture of  Add a Shortcut to Homescreen

Add a new widget to the phone wall, search for sl4a scripts and add. It
will let you choose the script and background or forground way of executing it; choose the background one and repeate the process for every command you wish to add! And that’s it!

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Bio: Electronics geek, Openwrt, Linux, hardware hacker, maker, SF fan.
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