Say you are at a cafe, and you want to surf the Web. But the WiFi is not secure. Or say your company lets you bring your laptop, but what if its firewall has blocked your favorite website? Is there no hope, besides paying $15 to a VPN provider?
There is, and it costs about $3.50 per month as of this writing.
Wear some SOCKS
You see, there is this thing called a “SOCKS proxy”. It acts as a middleman between you and a Website. The SSH server that comes with any standard Linux distribution can act as a SOCKS proxy for you. Fire up a Linux box on AWS Lightsail (fixed monthly charges), and you’re pretty much all set. It’s almost too good to be true.
Here is the configuration you need to set on your laptop, under
Host lightsail Hostname (your_lightsail_ip) User ubuntu IdentityFile (path_to_your_public_key) DynamicForward 1336 Compression yes
Next, set your browser to use a SOCKSv5 proxy with the IP address 127.0.0.1, port 1336. You can also set it to do DNS resolution for you, if you don’t want your cafe (or company) to know that you’re going to, say, jobsearch.com.
You can also set this system-wide. On Mac, go to Preferences > Networking > Advanced > Proxy, and set the SOCKS proxy there. This will let apps like Slack use your proxy. I set it on both my browser and at the system.
If your Lightsail VM is close enough to where you live, the additional latency is almost negligible. I browse the Web fine without any problems.
With this setup, the traffic between your laptop and the Lightsail VM is fully encrypted. This means, neither your home WiFi router, nor your ISP (or telecom provider, if you’re using 4G hotspot) router can see what Websites you’re visiting.
To confirm that your setup is working, try looking up the location of your IP address on Google. It should show your Lightsail VM location.
There are some caveats worth noting about in this solution.
First, your WiFi (or Ethernet) network should not block traffic to and from port 22 (the SSH port). This is usually not a problem.
Second, Web traffic is still in the plain between the SOCKS proxy and the Web server, unless you are visiting a HTTPS Web site. Stating the obvious here. :-) I think it’s still much better privacy than the default.
Third, you will need to log in to your Lightsail IP address every time you open your laptop. It helps to make your Lightsail IP address static (AWS allows this). This can be an annoyance, but you can easily automate it with a cron job that checks every second if port 1336 is open. I simply log in manually every time; it doesn’t bother me much.
Finally, your Linux VM on Lightsail cannot run in its default configuration. It should be hardened for security. As bare minimum, you should do the following on the Lightsail VM:
- SSH has 2-factor authentication from way back, and it’s called
host-based authentication. Enable this in
/etc/ssh/sshd_configand copy your laptop’s public key to it. Disable password-based access.
- Enable and start the firewall, it’s called ufw on Ubuntu. Open only port 22, and enable rate-limiting on it.
- Subscribe to security updates for ufw, sshd and Linux. Enable automatic security updates if possible.
It may be better to use OpenBSD instead of Linux, because of its more secure “closed-by-default” configuration. I’m on Linux, for now.