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IP Networking
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iptables as "proxy" and a filter
Post 302927078 by Smiling Dragon on Sunday 30th of November 2014 07:02:17 PM
11-30-2014
One thing I note in your friend's script is that it sets the firewall to drop all incoming connections before allowing port 22 (ssh) connections. If something goes wrong along the way on this, you'll need console access to get back in :/ I'd recommend setting the -P INPUT DROP last tbh 
As you've noted, this is just INPUT filters, your one is just NAT/IPMASQ. So it's like comparing apples and oranges really.
Looking just at your rules, I don't see anything untoward there, it appears that you are causing the proxy to accept traffic arriving on port 80 and redirecting it to 5.196.130.245.
An external customer connecting to the address would not be able to detect the redirect and would see all their connections as going to and coming back from the address of your proxy.
The webserver would see all the connections as coming from the proxy server address, unless the customer is setting "X-Forwarded-For" headers in their requests (not all that uncommon to find) which would be passed along to the webserver and quite possibly included in it's logs.
If you have a little more background of what your end goal is, we might be able to offer more advice
I would recommend also adding a FORWARD rule to DROP anything not for that port arriving from the external interface, as you've turned on IP forwarding and at present your setup would happily forward anything anyone asks it to. It's note really serious but could exacerbate any existing security issue into a full exploit.
As you've noted, this is just INPUT filters, your one is just NAT/IPMASQ. So it's like comparing apples and oranges really.
Looking just at your rules, I don't see anything untoward there, it appears that you are causing the proxy to accept traffic arriving on port 80 and redirecting it to 5.196.130.245.
An external customer connecting to the address would not be able to detect the redirect and would see all their connections as going to and coming back from the address of your proxy.
The webserver would see all the connections as coming from the proxy server address, unless the customer is setting "X-Forwarded-For" headers in their requests (not all that uncommon to find) which would be passed along to the webserver and quite possibly included in it's logs.
If you have a little more background of what your end goal is, we might be able to offer more advice
I would recommend also adding a FORWARD rule to DROP anything not for that port arriving from the external interface, as you've turned on IP forwarding and at present your setup would happily forward anything anyone asks it to. It's note really serious but could exacerbate any existing security issue into a full exploit.
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LEARN ABOUT DEBIAN
actexec
actexec(1) ActExec Manual actexec(1) NAME
ActExec - Task automation SYNOPSIS
actexec -s|-c|-Q|-p|--proxy-mode|--proxy-type|--proxy-host |--proxy-port|--proxy-user|--proxy-password|-v|-h <filename> DESCRIPTION
ActExec is a commandline tool that allows you to execute code files and scripts made with Actionaz. OPTIONS
-s, --script switch to script mode, may not be used with -c -c, --code switch to code mode, may not be used with -s -Q, --nocodeqt Do not include the Qt library into the code. -p, --portable Starts in portable mode, storing the settings in the executable folder. --proxy-mode Sets the proxy mode, values are none system custom (default is system). --proxy-type Sets the custom proxy type, values are http socks (default is socks). --proxy-host Sets the custom proxy host. --proxy-port Sets the custom proxy port. --proxy-user Sets the custom proxy user. --proxy-password Sets the custom proxy password. -v, --version Displays the version number of Actionaz. -h, --help Displays a listing of these commandline options. SUPPORT
Please visit http://www.actionaz.org/ for further information. Report bugs only if you are using the latest version available from the Actionaz website. COPYRIGHT
Copyright (C) 2005-2011 Jonathan Mercier-Ganady ActExec is distributed under the terms of the GNU General Public License version 3 or later. November 2011 actexec(1)