Termux ssh proxy config snippets

[diziet]

Really I ought to get my vpn up on my phone, but that's work. In the meantime so I can ssh into my phone, I have done this (which is a bit of a bodge, but very easy):

Install termux, and termux:widget. Inside termux, install termux-exec. (You may need to install the sshd explicitly too. Arrange for your termux to be able to ssh to your colo with ssh colo, by putting something like this in your .ssh/config on the phone:

Host chiark
  User ijackson
  Hostname login.chiark.greenend.org.uk

Put this script on the phone in .shortcuts/proxy and make it executable:

#! /bin/bash
sshd
ssh -v -R NNNN:localhost:8022 chiark head -1

where NNNN was a random port number. On my laptop, where I want to be able to ssh to the phone, add the following to .ssh/config:

Host star-wolf
 User android
 ProxyCommand ssh ijackson@chiark nc -q0 localhost NNNN

Add a "widget" to one of the home screen pages to invoke that. (Hold down a finger on an empty bit of the relevant home screen page; select "Widgets"; find Termux in the list, the rest is obvious.)

After copying ssh keys about appropriately, it all works nicely. If you don't have a shell account that you are happy to let your phone have control over, you could probably restrict the key; the syntax for this is left as an exercise to the reader :-).