Have you ever been tasked with testing a proxy server and realise that you first need to set one up?
I have... many times... so I've decided to make my life easier and produce a vagrant box thats setup to supply a working proxy server with easy switching between authenticated and open access.
To do this I wrote a quick bash script that calls some puppet scripts to switch between access settings:
sudo proxy-select. This will allow you to pick the proxy settings you want.
Once the proxy is up and running, you can access it via your test systems by configuring the system under test to point at the public IP addres the machine booted with. The proxy runs on port 3128.
When testing systems, its essential that the non-proxied internet access be
disabled, otherwise tets cannot be conclusive. One of the best ways to do this
is by setting up
iptables rules to drop all outbound traffic on ports 80 and
/sbin/iptables -A OUTPUT -p tcp --destination-port 80 -j DROP /sbin/iptables -A OUTPUT -p tcp --destination-port 443 -j DROP
Proxy access is then usually controlled on linux via the variables:
To deactivate the above rules, simply stop the iptables service (on RHEL/ centos):
sudo service iptables stop
Many applications ignore these variables and need to be configured separately.