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Contribs.org Forums => General Discussion => Topic started by: besterl on May 02, 2012, 09:27:23 AM

Title: External proxies
Post by: besterl on May 02, 2012, 09:27:23 AM
In squid I block keywords eg. porn.

One of the sites I am currently blocking is Facebook.

Some of the users are getting clever now and are starting to use an external anonymous proxy using port 3128 (Same as my onsite proxy).

I want to block it using the RiffRaff method, but I am not sure of the details I need to place in this template.

For example - If I want to block all access to 123.123.123.123 port 3128 TCP, what do I need to place in the 40DenyRiffRaff template

Thanks

Title: Re: External proxies
Post by: Stefano on May 02, 2012, 09:39:55 AM
none of your users should be able to change the proxy setup.. none of your users should be a local administrator..

IMHO you should change point of view.. instead changing SME, try to change your users' attitude..
Title: Re: External proxies
Post by: janet on May 02, 2012, 10:44:54 AM
besterl

Alternatively use the functionality of Dansguardian to force usage of the local DG proxy port
http://wiki.contribs.org/Dansguardian#Modifying_Firewall_and_Proxy
Title: Re: External proxies
Post by: mmccarn on May 02, 2012, 12:40:26 PM
Here is some info you could use to block all outgoing traffic from your LAN workstations without installing dansguardian:
http://wiki.contribs.org/Firewall#Block_outgoing_ports
Title: Re: External proxies
Post by: piran on May 06, 2012, 12:37:12 AM
I want to block it using the RiffRaff method, but I am not sure of the details I need to place in this template.
For example - If I want to block all access to 123.123.123.123 port 3128 TCP, what do I need to place in the 40DenyRiffRaff template
That 40DenyRiffRaff template, as supplied, blocks all stuff 'incoming'
...whereas I suspect you want/need to block stuff 'outgoing'?
Should I want to do this here then I would do it on the router.
Dead simple... a few options in the packet sniffing firewall configuration.
YMMV