Thursday, 13 December 2012

Basic Linux Commands List

The purpose of this blog entry is to document a few basic Linux commands that i find useful. I'm fairly new to Linux and recording these commands gives me a point of reference and helps me remember them.

It's important to note that in Linux syntax is case sensitive.

I am using Ubuntu so my syntax may differ slightly to yours if you are using another distro. If you want to learn more about any of the commands i list try the following:

SSH Tunnel

SSH Tunneling

This is a quick blog post to let my mate Ollie know about a few ways that I use SSH and how it is useful.

Firstly, a SSH client connects to a SSH server, logs in with either a password or certificate and communicates over an encrypted tunnel. The beauty of SSH is that it is also easy to tunnel other types of traffic such as HTTP or VNC over the tunnel. This is useful for the following:

> Secure Administration of a remote server.
> Secure File transfer.
> Securing web traffic over a non-secure wired or wireless network.
> Bypassing of restrictions and filtering imposed on the local network.

SSH Tunneling Full Tutorial

SSH Tunneling the Pretty Way

This is just a quick post about a nice little tool I found that allows you to setup and save your SSH tunnels and then quickly bring them up when required. Why might you want to do this? Well theres plenty of reasons. They range from it feels geeky, to you're paranoid about those kids in the coffee shop with the "Hack Naked" stickers on there laptops, to just because you can.

Now this guide does assume that you have a SSH server that you can get too and its running Privoxy on port 8118.

The tool is Gnome SSH Tunnel Manager (gSTM) and is available from the repositories.

apt-get install gstm

Now, a quick reminder of the manual way:

ssh -NL 8118:localhost:8118 synjunkie@ssh_server_ipaddress

Then point your browsers proxy at localhost:8118

And now the pretty way.

Create The Tunnel

Open gSTM from Applications > Internet Menu, and enter your SSH server details. Click Add to configure the port redirection settings and click OK.

Save the settings by clicking OK.

Now you have a tunnel that is saved for you and can be started by Clicking on the Start Button.

Configure The Browser

Now you need to tell Firefox to use your tunnel. Open Firefox Preferences from the Edit menu in Firefox and amend the network proxy settings.

Now you can safely browse the web

You could make this even more seamless by adding a Firefox extension to allow you to have multiple proxy configurations set up and simply select which one you want using drop down list on the toolbar. Switch Proxy works well for this.

Check The Tunnel

You can test that your traffic is being tunneled by using Netstat, Etherape, TCPDump or a number of other tools. Bellow I have used Netstat.

I can see that I am making connections to local port 8118 and that the only external web traffic is going to my SSH server.
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