Fun With Socks

Fun with SOCKS proxy's

Sometimes you are not at home, but you want access to your local systems with DNS and everything. And guess what, it's possible. The only thing you need is a dyndns setup or a static IP or and a open port for ssh.

Additionally you need a ssh server in your network, I recommend to configure this server to key based login only or at least with 2 factor authentication.

I personally like to setup my host in the ssh config file something like this:

Host hostname
    Hostname my.dyndns.example
    Port 3333
    User myuser
    IdentityFile ~/.ssh/myprivatkey

With this in place you can now easily open a SOCKS proxy

ssh -4 -Nn -D 1080 hostname

This opens a SOCKS proxy on your localhost:1080 which tunnels your traffic through your host in your home network. To test this you can configure this in your Firefox. Options -> Advanced -> Network -> Settings... there you can set your SOCKS Host and port. Now your ready to got, just browse to a site in your local network.

Special Firefox settings

Since you proxy all your traffic through your SOCKS proxy you probably didn't want to leak your DNS query's, so just set network.proxy.socks_remote_dns to true. (you find it in about:config) I set this always on true because I run a DNS server in my home network.

AutoProxy (not working for me in latest Firefox)

But now all your traffic goes through your home network, depending on your internet connection this is maybe a bit slow.

So there are Firefox plugins which allow you to set rules when which proxy is used. On of this plugins is FoxyProxy. The problem with this is you need a paid pro version to configure rules for IP addresses. So I tried AutoProxy instead. And with AutoProxy it's simple to configure 2 rules, one for my local domain and one for my IP range.

PAC files to the rescue

Since AutoProxy stopt working I need a new solution. And guess what it's really simple. Most browser have the ability to use PAC files.

And here is mine:

$ cat setup.pac
//alerts are in ctrl + shift + j
function FindProxyForURL(url, host)
{
  if(shExpMatch(host, "*.l33t.lan*") || shExpMatch(host, "192.168.1.*"))
  {
    return "SOCKS 127.0.0.1:1080";
  }

  // The default case
  return "DIRECT";
}

Just configure your Firefox to use it (don't forget to restart your browser). You just use the file path:

Options -> Advanced -> Network -> Settings...

Now all request for my subnet 192.168.1.0/24 and my domain l33t.lan are going through the SOCKS proxy and the rest using as before no proxy. The best from both worlds.

Binaergewitter Sticker

Wie vermutlich die meisten von euch wissen, bin ich "Profi Podcast Hörer". Und so als Profi möchte man sich auch mal ein Sticker seines Lieblings Podcast auf den Laptop kleben.

Die Binargewitter Menschen haben zwar mal gesagt das es Sticker geben wird aber so lange kann ich nicht warten, also hab ich mich bereit erklärt Sticker zu machen.

So würden die Sticker aussehen und vermutlich 2x6 zoll gross sein. (falls sich jemand findet der was hübscheres designen kann, sticker@l33t.name)

Wer jetzt auch so Sticker möchte, schreibt mir doch kurz eine Mail (sticker@l33t.name) wie viele und wie viel Geld ihr dafür ausgeben würdet.

Wenn etwas daraus wird werde ich sie sicher an den 31c3 mitbringen oder gegen den Aufpreis von ~5 euro in ein Couvert stecken und an euch senden.

Update

Ich hab dann einfach mal Sticker bestellt. Gibt ~100 stück am #31c3. Vielleicht gibt es sogar ein Hörertreffen.

Allow Raw Sockets Per Jail

This is more a note for me than a blog post. I struggle a bit with allowing raw sockets on a per jail basis. But if you know how it's done, it's not really hard. At least not with ezjail where you have a per jail config file. Let's say you need raw sockets in a jail named 'examplejail' you just need to add:

export jail_examplejail_parameters="allow.raw_sockets=1"

to the config file which you find under /usr/local/etc/ezjail/examplejail.

Restart ezjail and \o/ you have access from your examplejail to the raw sockets.

My Db9 Adapter

I just want to share with you my awesome setup to connect with BD-9.

The laptop still runs Debian 6 and everything is working as expected. o.O

Chromecast

I recently bought a Chromecast. And what should I say, I'm happy with it. The setup was easy as expected, you just plug in your HDMI and connect it with power.

How it looks

The down site

When I bought it, there was only one or two apps I use frequently which support Chromecast. But since then there was a lot movement in this area. A really nice is that google build the "Cast Screen" which allow you to stream you android screen to Chromecast. This mean all apps work with Chromecast.

The game changer for me personally was BeyondPod which is super awesome to stream video podcast. An other thing I do regularly, is streaming my plex movies to Chromecast.

Summary

If you use regularly plex, BeyondPod or YouTube and you have a HDMI screen buy a Chromecast.