For this you need:
1. At least one open port for output connection OR access to proxy.
2. Server in the internet with root OR user rights.

You can easily get it in several simple steps. Just imagine that you located at office1 and open port for ongoing connection = 443. Also you have access to server1 which located at internet. Now go to server1 and edit ssh configuration file. Add new port directive into this file(in case if you have open port, in other case skip this step). Like this:

server1# grep -i port /etc/ssh/sshd_config
Port 22
Port 443

As you can see now server1 use 2 ports(22 and 443) for ssh daemon. Let’s check it:

server1# netstat -lnp | grep ssh
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      3946/sshd
tcp        0      0 0.0.0.0:443             0.0.0.0:*               LISTEN      3946/sshd

It’s ok. The next step #2 install proxy server. You can choose anyone you like. I chose tinyproxy, because of it’s very small and simple in configuration.

server1# apt-get install tinyproxy 

It’s valid command for debian. For your distro use distro specific package manager as well.

Go to /etc/tinyproxy/tinyproxy.conf and check port and listen directives for determinate on which port and address your proxy listen. In my case it’s port 8888 on localhost:

server1#grep -E "^(Port|Listen)"  /etc/tinyproxy/tinyproxy.conf
Port 8888
Listen 127.0.0.1

Start daemon and check that it run:

server1# /etc/init.d/tinyproxy start
server1# netstat -lnp | grep tinyproxy
tcp        0      127.0.0.1:8888              0.0.0.0:*               LISTEN      3923/tinyproxy

Looks fine. Now make ssh tunnel to your server. If you have direct connection to server. Use this :

server1#ssh -p 443 user@server#1 -L8888:127.0.0.01:8888 

If not then do as described here.

And last one step is setting up proxy 127.0.0.1:8888 on your browser and enjoy.

To run it on your box you should have perl interpreter and some perl modules. Such as:

LWP::UserAgent
Getopt::Long

You can get it directly from site or over the cpan util as well. The source of script here You have to put it on your computer. Also you need get the list of proxy(It can be easily done by google, just type “anonymous proxy list” and you will get a lot of links). Take list and put into the file. Like this :

agrytsenko:~/tmp$ cat proxy.2
64.66.192.61:80 0.8680  Transp. US      Y       65%     2008-12-04 09:51:23
89.114.36.221:8000      1.0750  Elite   RO      ?       30%     2008-12-04 09:39:18
74.65.65.195:8000       1.1030  Elite   US      Y       47%     2008-12-04 09:40:49
89.97.128.86:6588       1.1630  Elite   IT      N       33%     2008-12-04 09:37:52
200.179.72.132:80       1.1830  Transp. BR      Y       91%     2008-12-04 09:51:23
207.182.129.90:3128     1.2570  Transp. US      Y       54%     2008-12-04 09:51:23
207.182.129.91:3128     1.2850  Transp. US      Y       57%     2008-12-04 09:51:23
66.98.152.157:6654      1.4750  Elite   US      Y       11%     2008-12-04 09:37:52
92.48.119.220:6654      1.6100  Elite   GB      Y       29%     2008-12-04 09:36:26

or like this:

agrytsenko:~/tmp$ cat proxy
64.66.192.61:80
150.101.196.52:3128
114.30.47.10:80
114.127.246.36

The main rule of file format: the first field has to be ip:port of proxy.

The script has several keys. Here they are:

agrytsenko:~/tmp$ ./proxy_checker.pl -h
-f file         Specify file
-v              Turn on verbose mode
-h              Print this help

Okay, now you are ready to run it:

agrytsenko:~/tmp$ ./proxy_checker.pl -f ./proxy -v
Try to open proxy list ./proxy
Connect to site over 64.66.192.61:80...
Connection was not established. The reason is :
500 Can't connect to 64.66.192.61:80 (connect: timeout)

Connect to site over 150.101.196.52:3128...
Success connected with IP=150.101.196.52
Proxy 150.101.196.52:3128 is avaible for connections
The 150.101.196.52:3128 is not fully anonymous. You ip address is 79.124.129.220

Connect to site over 114.30.47.10:80...
Connection was not established. The reason is :
503 Service Unavailable

Connect to site over 114.127.246.36:8080...
Success connected with IP=114.127.246.36
Proxy 114.127.246.36:8080 is avaible for connections

As you can see we have only one fully anonymous proxy for now. It’s 114.127.246.36.

Done.